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Comparing libev/ev.c (file contents):
Revision 1.50 by root, Sat Nov 3 19:41:55 2007 UTC vs.
Revision 1.427 by root, Sun May 6 19:29:59 2012 UTC

1/* 1/*
2 * libev event processing core, watcher management 2 * libev event processing core, watcher management
3 * 3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary forms, with or without 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * modification, are permitted provided that the following conditions are 8 * tion, are permitted provided that the following conditions are met:
9 * met:
10 * 9 *
11 * * Redistributions of source code must retain the above copyright 10 * 1. Redistributions of source code must retain the above copyright notice,
12 * notice, this list of conditions and the following disclaimer. 11 * this list of conditions and the following disclaimer.
13 * 12 *
14 * * Redistributions in binary form must reproduce the above 13 * 2. Redistributions in binary form must reproduce the above copyright
15 * copyright notice, this list of conditions and the following 14 * notice, this list of conditions and the following disclaimer in the
16 * disclaimer in the documentation and/or other materials provided 15 * documentation and/or other materials provided with the distribution.
17 * with the distribution.
18 * 16 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
30 */ 38 */
39
40/* this big block deduces configuration from config.h */
31#ifndef EV_STANDALONE 41#ifndef EV_STANDALONE
42# ifdef EV_CONFIG_H
43# include EV_CONFIG_H
44# else
32# include "config.h" 45# include "config.h"
33#endif 46# endif
34 47
35#include <math.h> 48#if HAVE_FLOOR
49# ifndef EV_USE_FLOOR
50# define EV_USE_FLOOR 1
51# endif
52#endif
53
54# if HAVE_CLOCK_SYSCALL
55# ifndef EV_USE_CLOCK_SYSCALL
56# define EV_USE_CLOCK_SYSCALL 1
57# ifndef EV_USE_REALTIME
58# define EV_USE_REALTIME 0
59# endif
60# ifndef EV_USE_MONOTONIC
61# define EV_USE_MONOTONIC 1
62# endif
63# endif
64# elif !defined EV_USE_CLOCK_SYSCALL
65# define EV_USE_CLOCK_SYSCALL 0
66# endif
67
68# if HAVE_CLOCK_GETTIME
69# ifndef EV_USE_MONOTONIC
70# define EV_USE_MONOTONIC 1
71# endif
72# ifndef EV_USE_REALTIME
73# define EV_USE_REALTIME 0
74# endif
75# else
76# ifndef EV_USE_MONOTONIC
77# define EV_USE_MONOTONIC 0
78# endif
79# ifndef EV_USE_REALTIME
80# define EV_USE_REALTIME 0
81# endif
82# endif
83
84# if HAVE_NANOSLEEP
85# ifndef EV_USE_NANOSLEEP
86# define EV_USE_NANOSLEEP EV_FEATURE_OS
87# endif
88# else
89# undef EV_USE_NANOSLEEP
90# define EV_USE_NANOSLEEP 0
91# endif
92
93# if HAVE_SELECT && HAVE_SYS_SELECT_H
94# ifndef EV_USE_SELECT
95# define EV_USE_SELECT EV_FEATURE_BACKENDS
96# endif
97# else
98# undef EV_USE_SELECT
99# define EV_USE_SELECT 0
100# endif
101
102# if HAVE_POLL && HAVE_POLL_H
103# ifndef EV_USE_POLL
104# define EV_USE_POLL EV_FEATURE_BACKENDS
105# endif
106# else
107# undef EV_USE_POLL
108# define EV_USE_POLL 0
109# endif
110
111# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
112# ifndef EV_USE_EPOLL
113# define EV_USE_EPOLL EV_FEATURE_BACKENDS
114# endif
115# else
116# undef EV_USE_EPOLL
117# define EV_USE_EPOLL 0
118# endif
119
120# if HAVE_KQUEUE && HAVE_SYS_EVENT_H
121# ifndef EV_USE_KQUEUE
122# define EV_USE_KQUEUE EV_FEATURE_BACKENDS
123# endif
124# else
125# undef EV_USE_KQUEUE
126# define EV_USE_KQUEUE 0
127# endif
128
129# if HAVE_PORT_H && HAVE_PORT_CREATE
130# ifndef EV_USE_PORT
131# define EV_USE_PORT EV_FEATURE_BACKENDS
132# endif
133# else
134# undef EV_USE_PORT
135# define EV_USE_PORT 0
136# endif
137
138# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
139# ifndef EV_USE_INOTIFY
140# define EV_USE_INOTIFY EV_FEATURE_OS
141# endif
142# else
143# undef EV_USE_INOTIFY
144# define EV_USE_INOTIFY 0
145# endif
146
147# if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
148# ifndef EV_USE_SIGNALFD
149# define EV_USE_SIGNALFD EV_FEATURE_OS
150# endif
151# else
152# undef EV_USE_SIGNALFD
153# define EV_USE_SIGNALFD 0
154# endif
155
156# if HAVE_EVENTFD
157# ifndef EV_USE_EVENTFD
158# define EV_USE_EVENTFD EV_FEATURE_OS
159# endif
160# else
161# undef EV_USE_EVENTFD
162# define EV_USE_EVENTFD 0
163# endif
164
165#endif
166
36#include <stdlib.h> 167#include <stdlib.h>
37#include <unistd.h> 168#include <string.h>
38#include <fcntl.h> 169#include <fcntl.h>
39#include <signal.h>
40#include <stddef.h> 170#include <stddef.h>
41 171
42#include <stdio.h> 172#include <stdio.h>
43 173
44#include <assert.h> 174#include <assert.h>
45#include <errno.h> 175#include <errno.h>
46#include <sys/types.h> 176#include <sys/types.h>
177#include <time.h>
178#include <limits.h>
179
180#include <signal.h>
181
182#ifdef EV_H
183# include EV_H
184#else
185# include "ev.h"
186#endif
187
188#if EV_NO_THREADS
189# undef EV_NO_SMP
190# define EV_NO_SMP 1
191# undef ECB_NO_THREADS
192# define ECB_NO_THREADS 1
193#endif
194#if EV_NO_SMP
195# undef EV_NO_SMP
196# define ECB_NO_SMP 1
197#endif
198
47#ifndef WIN32 199#ifndef _WIN32
200# include <sys/time.h>
48# include <sys/wait.h> 201# include <sys/wait.h>
202# include <unistd.h>
203#else
204# include <io.h>
205# define WIN32_LEAN_AND_MEAN
206# include <windows.h>
207# ifndef EV_SELECT_IS_WINSOCKET
208# define EV_SELECT_IS_WINSOCKET 1
49#endif 209# endif
50#include <sys/time.h> 210# undef EV_AVOID_STDIO
51#include <time.h> 211#endif
52 212
53/**/ 213/* OS X, in its infinite idiocy, actually HARDCODES
214 * a limit of 1024 into their select. Where people have brains,
215 * OS X engineers apparently have a vacuum. Or maybe they were
216 * ordered to have a vacuum, or they do anything for money.
217 * This might help. Or not.
218 */
219#define _DARWIN_UNLIMITED_SELECT 1
220
221/* this block tries to deduce configuration from header-defined symbols and defaults */
222
223/* try to deduce the maximum number of signals on this platform */
224#if defined EV_NSIG
225/* use what's provided */
226#elif defined NSIG
227# define EV_NSIG (NSIG)
228#elif defined _NSIG
229# define EV_NSIG (_NSIG)
230#elif defined SIGMAX
231# define EV_NSIG (SIGMAX+1)
232#elif defined SIG_MAX
233# define EV_NSIG (SIG_MAX+1)
234#elif defined _SIG_MAX
235# define EV_NSIG (_SIG_MAX+1)
236#elif defined MAXSIG
237# define EV_NSIG (MAXSIG+1)
238#elif defined MAX_SIG
239# define EV_NSIG (MAX_SIG+1)
240#elif defined SIGARRAYSIZE
241# define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
242#elif defined _sys_nsig
243# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
244#else
245# error "unable to find value for NSIG, please report"
246/* to make it compile regardless, just remove the above line, */
247/* but consider reporting it, too! :) */
248# define EV_NSIG 65
249#endif
250
251#ifndef EV_USE_FLOOR
252# define EV_USE_FLOOR 0
253#endif
254
255#ifndef EV_USE_CLOCK_SYSCALL
256# if __linux && __GLIBC__ >= 2
257# define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
258# else
259# define EV_USE_CLOCK_SYSCALL 0
260# endif
261#endif
54 262
55#ifndef EV_USE_MONOTONIC 263#ifndef EV_USE_MONOTONIC
264# if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
265# define EV_USE_MONOTONIC EV_FEATURE_OS
266# else
56# define EV_USE_MONOTONIC 1 267# define EV_USE_MONOTONIC 0
268# endif
269#endif
270
271#ifndef EV_USE_REALTIME
272# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
273#endif
274
275#ifndef EV_USE_NANOSLEEP
276# if _POSIX_C_SOURCE >= 199309L
277# define EV_USE_NANOSLEEP EV_FEATURE_OS
278# else
279# define EV_USE_NANOSLEEP 0
280# endif
57#endif 281#endif
58 282
59#ifndef EV_USE_SELECT 283#ifndef EV_USE_SELECT
60# define EV_USE_SELECT 1 284# define EV_USE_SELECT EV_FEATURE_BACKENDS
61#endif 285#endif
62 286
63#ifndef EV_USE_POLL 287#ifndef EV_USE_POLL
64# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */ 288# ifdef _WIN32
289# define EV_USE_POLL 0
290# else
291# define EV_USE_POLL EV_FEATURE_BACKENDS
292# endif
65#endif 293#endif
66 294
67#ifndef EV_USE_EPOLL 295#ifndef EV_USE_EPOLL
296# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
297# define EV_USE_EPOLL EV_FEATURE_BACKENDS
298# else
68# define EV_USE_EPOLL 0 299# define EV_USE_EPOLL 0
300# endif
69#endif 301#endif
70 302
71#ifndef EV_USE_KQUEUE 303#ifndef EV_USE_KQUEUE
72# define EV_USE_KQUEUE 0 304# define EV_USE_KQUEUE 0
73#endif 305#endif
74 306
75#ifndef EV_USE_REALTIME 307#ifndef EV_USE_PORT
76# define EV_USE_REALTIME 1 308# define EV_USE_PORT 0
309#endif
310
311#ifndef EV_USE_INOTIFY
312# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
313# define EV_USE_INOTIFY EV_FEATURE_OS
314# else
315# define EV_USE_INOTIFY 0
77#endif 316# endif
317#endif
78 318
79/**/ 319#ifndef EV_PID_HASHSIZE
320# define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
321#endif
322
323#ifndef EV_INOTIFY_HASHSIZE
324# define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
325#endif
326
327#ifndef EV_USE_EVENTFD
328# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
329# define EV_USE_EVENTFD EV_FEATURE_OS
330# else
331# define EV_USE_EVENTFD 0
332# endif
333#endif
334
335#ifndef EV_USE_SIGNALFD
336# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
337# define EV_USE_SIGNALFD EV_FEATURE_OS
338# else
339# define EV_USE_SIGNALFD 0
340# endif
341#endif
342
343#if 0 /* debugging */
344# define EV_VERIFY 3
345# define EV_USE_4HEAP 1
346# define EV_HEAP_CACHE_AT 1
347#endif
348
349#ifndef EV_VERIFY
350# define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
351#endif
352
353#ifndef EV_USE_4HEAP
354# define EV_USE_4HEAP EV_FEATURE_DATA
355#endif
356
357#ifndef EV_HEAP_CACHE_AT
358# define EV_HEAP_CACHE_AT EV_FEATURE_DATA
359#endif
360
361/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
362/* which makes programs even slower. might work on other unices, too. */
363#if EV_USE_CLOCK_SYSCALL
364# include <sys/syscall.h>
365# ifdef SYS_clock_gettime
366# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
367# undef EV_USE_MONOTONIC
368# define EV_USE_MONOTONIC 1
369# else
370# undef EV_USE_CLOCK_SYSCALL
371# define EV_USE_CLOCK_SYSCALL 0
372# endif
373#endif
374
375/* this block fixes any misconfiguration where we know we run into trouble otherwise */
376
377#ifdef _AIX
378/* AIX has a completely broken poll.h header */
379# undef EV_USE_POLL
380# define EV_USE_POLL 0
381#endif
80 382
81#ifndef CLOCK_MONOTONIC 383#ifndef CLOCK_MONOTONIC
82# undef EV_USE_MONOTONIC 384# undef EV_USE_MONOTONIC
83# define EV_USE_MONOTONIC 0 385# define EV_USE_MONOTONIC 0
84#endif 386#endif
… …
86#ifndef CLOCK_REALTIME 388#ifndef CLOCK_REALTIME
87# undef EV_USE_REALTIME 389# undef EV_USE_REALTIME
88# define EV_USE_REALTIME 0 390# define EV_USE_REALTIME 0
89#endif 391#endif
90 392
393#if !EV_STAT_ENABLE
394# undef EV_USE_INOTIFY
395# define EV_USE_INOTIFY 0
396#endif
397
398#if !EV_USE_NANOSLEEP
399/* hp-ux has it in sys/time.h, which we unconditionally include above */
400# if !defined _WIN32 && !defined __hpux
401# include <sys/select.h>
402# endif
403#endif
404
405#if EV_USE_INOTIFY
406# include <sys/statfs.h>
407# include <sys/inotify.h>
408/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
409# ifndef IN_DONT_FOLLOW
410# undef EV_USE_INOTIFY
411# define EV_USE_INOTIFY 0
412# endif
413#endif
414
415#if EV_SELECT_IS_WINSOCKET
416# include <winsock.h>
417#endif
418
419#if EV_USE_EVENTFD
420/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
421# include <stdint.h>
422# ifndef EFD_NONBLOCK
423# define EFD_NONBLOCK O_NONBLOCK
424# endif
425# ifndef EFD_CLOEXEC
426# ifdef O_CLOEXEC
427# define EFD_CLOEXEC O_CLOEXEC
428# else
429# define EFD_CLOEXEC 02000000
430# endif
431# endif
432EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
433#endif
434
435#if EV_USE_SIGNALFD
436/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
437# include <stdint.h>
438# ifndef SFD_NONBLOCK
439# define SFD_NONBLOCK O_NONBLOCK
440# endif
441# ifndef SFD_CLOEXEC
442# ifdef O_CLOEXEC
443# define SFD_CLOEXEC O_CLOEXEC
444# else
445# define SFD_CLOEXEC 02000000
446# endif
447# endif
448EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
449
450struct signalfd_siginfo
451{
452 uint32_t ssi_signo;
453 char pad[128 - sizeof (uint32_t)];
454};
455#endif
456
91/**/ 457/**/
92 458
459#if EV_VERIFY >= 3
460# define EV_FREQUENT_CHECK ev_verify (EV_A)
461#else
462# define EV_FREQUENT_CHECK do { } while (0)
463#endif
464
465/*
466 * This is used to work around floating point rounding problems.
467 * This value is good at least till the year 4000.
468 */
469#define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
470/*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
471
93#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 472#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
94#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */ 473#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
95#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
96/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
97 474
98#include "ev.h" 475#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
476#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
99 477
478/* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
479/* ECB.H BEGIN */
480/*
481 * libecb - http://software.schmorp.de/pkg/libecb
482 *
483 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
484 * Copyright (©) 2011 Emanuele Giaquinta
485 * All rights reserved.
486 *
487 * Redistribution and use in source and binary forms, with or without modifica-
488 * tion, are permitted provided that the following conditions are met:
489 *
490 * 1. Redistributions of source code must retain the above copyright notice,
491 * this list of conditions and the following disclaimer.
492 *
493 * 2. Redistributions in binary form must reproduce the above copyright
494 * notice, this list of conditions and the following disclaimer in the
495 * documentation and/or other materials provided with the distribution.
496 *
497 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
498 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
499 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
500 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
501 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
502 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
503 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
504 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
505 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
506 * OF THE POSSIBILITY OF SUCH DAMAGE.
507 */
508
509#ifndef ECB_H
510#define ECB_H
511
512#ifdef _WIN32
513 typedef signed char int8_t;
514 typedef unsigned char uint8_t;
515 typedef signed short int16_t;
516 typedef unsigned short uint16_t;
517 typedef signed int int32_t;
518 typedef unsigned int uint32_t;
100#if __GNUC__ >= 3 519 #if __GNUC__
101# define expect(expr,value) __builtin_expect ((expr),(value)) 520 typedef signed long long int64_t;
102# define inline inline 521 typedef unsigned long long uint64_t;
522 #else /* _MSC_VER || __BORLANDC__ */
523 typedef signed __int64 int64_t;
524 typedef unsigned __int64 uint64_t;
525 #endif
103#else 526#else
104# define expect(expr,value) (expr) 527 #include <inttypes.h>
105# define inline static 528#endif
529
530/* many compilers define _GNUC_ to some versions but then only implement
531 * what their idiot authors think are the "more important" extensions,
532 * causing enormous grief in return for some better fake benchmark numbers.
533 * or so.
534 * we try to detect these and simply assume they are not gcc - if they have
535 * an issue with that they should have done it right in the first place.
536 */
537#ifndef ECB_GCC_VERSION
538 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
539 #define ECB_GCC_VERSION(major,minor) 0
540 #else
541 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
106#endif 542 #endif
107 543#endif
108#define expect_false(expr) expect ((expr) != 0, 0)
109#define expect_true(expr) expect ((expr) != 0, 1)
110
111#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
112#define ABSPRI(w) ((w)->priority - EV_MINPRI)
113
114typedef struct ev_watcher *W;
115typedef struct ev_watcher_list *WL;
116typedef struct ev_watcher_time *WT;
117
118static ev_tstamp now_floor, now, diff; /* monotonic clock */
119ev_tstamp ev_now;
120int ev_method;
121
122static int have_monotonic; /* runtime */
123
124static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
125static void (*method_modify)(int fd, int oev, int nev);
126static void (*method_poll)(ev_tstamp timeout);
127 544
128/*****************************************************************************/ 545/*****************************************************************************/
129 546
547/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
548/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
549
550#if ECB_NO_THREADS
551# define ECB_NO_SMP 1
552#endif
553
554#if ECB_NO_THREADS || ECB_NO_SMP
555 #define ECB_MEMORY_FENCE do { } while (0)
556#endif
557
558#ifndef ECB_MEMORY_FENCE
559 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
560 #if __i386 || __i386__
561 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
562 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
563 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
564 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
565 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
566 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
567 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
568 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
569 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
570 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
571 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
572 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
573 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
574 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
575 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
576 #elif __sparc || __sparc__
577 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
578 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
579 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
580 #elif defined __s390__ || defined __s390x__
581 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
582 #elif defined __mips__
583 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
584 #elif defined __alpha__
585 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
586 #endif
587 #endif
588#endif
589
590#ifndef ECB_MEMORY_FENCE
591 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
592 #define ECB_MEMORY_FENCE __sync_synchronize ()
593 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
594 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
595 #elif _MSC_VER >= 1400 /* VC++ 2005 */
596 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
597 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
598 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
599 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
600 #elif defined _WIN32
601 #include <WinNT.h>
602 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
603 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
604 #include <mbarrier.h>
605 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
606 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
607 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
608 #elif __xlC__
609 #define ECB_MEMORY_FENCE __sync ()
610 #endif
611#endif
612
613#ifndef ECB_MEMORY_FENCE
614 #if !ECB_AVOID_PTHREADS
615 /*
616 * if you get undefined symbol references to pthread_mutex_lock,
617 * or failure to find pthread.h, then you should implement
618 * the ECB_MEMORY_FENCE operations for your cpu/compiler
619 * OR provide pthread.h and link against the posix thread library
620 * of your system.
621 */
622 #include <pthread.h>
623 #define ECB_NEEDS_PTHREADS 1
624 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
625
626 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
627 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
628 #endif
629#endif
630
631#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
632 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
633#endif
634
635#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
636 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
637#endif
638
639/*****************************************************************************/
640
641#define ECB_C99 (__STDC_VERSION__ >= 199901L)
642
643#if __cplusplus
644 #define ecb_inline static inline
645#elif ECB_GCC_VERSION(2,5)
646 #define ecb_inline static __inline__
647#elif ECB_C99
648 #define ecb_inline static inline
649#else
650 #define ecb_inline static
651#endif
652
653#if ECB_GCC_VERSION(3,3)
654 #define ecb_restrict __restrict__
655#elif ECB_C99
656 #define ecb_restrict restrict
657#else
658 #define ecb_restrict
659#endif
660
661typedef int ecb_bool;
662
663#define ECB_CONCAT_(a, b) a ## b
664#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
665#define ECB_STRINGIFY_(a) # a
666#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
667
668#define ecb_function_ ecb_inline
669
670#if ECB_GCC_VERSION(3,1)
671 #define ecb_attribute(attrlist) __attribute__(attrlist)
672 #define ecb_is_constant(expr) __builtin_constant_p (expr)
673 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
674 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
675#else
676 #define ecb_attribute(attrlist)
677 #define ecb_is_constant(expr) 0
678 #define ecb_expect(expr,value) (expr)
679 #define ecb_prefetch(addr,rw,locality)
680#endif
681
682/* no emulation for ecb_decltype */
683#if ECB_GCC_VERSION(4,5)
684 #define ecb_decltype(x) __decltype(x)
685#elif ECB_GCC_VERSION(3,0)
686 #define ecb_decltype(x) __typeof(x)
687#endif
688
689#define ecb_noinline ecb_attribute ((__noinline__))
690#define ecb_noreturn ecb_attribute ((__noreturn__))
691#define ecb_unused ecb_attribute ((__unused__))
692#define ecb_const ecb_attribute ((__const__))
693#define ecb_pure ecb_attribute ((__pure__))
694
695#if ECB_GCC_VERSION(4,3)
696 #define ecb_artificial ecb_attribute ((__artificial__))
697 #define ecb_hot ecb_attribute ((__hot__))
698 #define ecb_cold ecb_attribute ((__cold__))
699#else
700 #define ecb_artificial
701 #define ecb_hot
702 #define ecb_cold
703#endif
704
705/* put around conditional expressions if you are very sure that the */
706/* expression is mostly true or mostly false. note that these return */
707/* booleans, not the expression. */
708#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
709#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
710/* for compatibility to the rest of the world */
711#define ecb_likely(expr) ecb_expect_true (expr)
712#define ecb_unlikely(expr) ecb_expect_false (expr)
713
714/* count trailing zero bits and count # of one bits */
715#if ECB_GCC_VERSION(3,4)
716 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
717 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
718 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
719 #define ecb_ctz32(x) __builtin_ctz (x)
720 #define ecb_ctz64(x) __builtin_ctzll (x)
721 #define ecb_popcount32(x) __builtin_popcount (x)
722 /* no popcountll */
723#else
724 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
725 ecb_function_ int
726 ecb_ctz32 (uint32_t x)
727 {
728 int r = 0;
729
730 x &= ~x + 1; /* this isolates the lowest bit */
731
732#if ECB_branchless_on_i386
733 r += !!(x & 0xaaaaaaaa) << 0;
734 r += !!(x & 0xcccccccc) << 1;
735 r += !!(x & 0xf0f0f0f0) << 2;
736 r += !!(x & 0xff00ff00) << 3;
737 r += !!(x & 0xffff0000) << 4;
738#else
739 if (x & 0xaaaaaaaa) r += 1;
740 if (x & 0xcccccccc) r += 2;
741 if (x & 0xf0f0f0f0) r += 4;
742 if (x & 0xff00ff00) r += 8;
743 if (x & 0xffff0000) r += 16;
744#endif
745
746 return r;
747 }
748
749 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
750 ecb_function_ int
751 ecb_ctz64 (uint64_t x)
752 {
753 int shift = x & 0xffffffffU ? 0 : 32;
754 return ecb_ctz32 (x >> shift) + shift;
755 }
756
757 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
758 ecb_function_ int
759 ecb_popcount32 (uint32_t x)
760 {
761 x -= (x >> 1) & 0x55555555;
762 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
763 x = ((x >> 4) + x) & 0x0f0f0f0f;
764 x *= 0x01010101;
765
766 return x >> 24;
767 }
768
769 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
770 ecb_function_ int ecb_ld32 (uint32_t x)
771 {
772 int r = 0;
773
774 if (x >> 16) { x >>= 16; r += 16; }
775 if (x >> 8) { x >>= 8; r += 8; }
776 if (x >> 4) { x >>= 4; r += 4; }
777 if (x >> 2) { x >>= 2; r += 2; }
778 if (x >> 1) { r += 1; }
779
780 return r;
781 }
782
783 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
784 ecb_function_ int ecb_ld64 (uint64_t x)
785 {
786 int r = 0;
787
788 if (x >> 32) { x >>= 32; r += 32; }
789
790 return r + ecb_ld32 (x);
791 }
792#endif
793
794ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
795ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
796{
797 return ( (x * 0x0802U & 0x22110U)
798 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
799}
800
801ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
802ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
803{
804 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
805 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
806 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
807 x = ( x >> 8 ) | ( x << 8);
808
809 return x;
810}
811
812ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
813ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
814{
815 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
816 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
817 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
818 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
819 x = ( x >> 16 ) | ( x << 16);
820
821 return x;
822}
823
824/* popcount64 is only available on 64 bit cpus as gcc builtin */
825/* so for this version we are lazy */
826ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
827ecb_function_ int
828ecb_popcount64 (uint64_t x)
829{
830 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
831}
832
833ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
834ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
835ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
836ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
837ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
838ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
839ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
840ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
841
842ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
843ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
844ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
845ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
846ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
847ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
848ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
849ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
850
851#if ECB_GCC_VERSION(4,3)
852 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
853 #define ecb_bswap32(x) __builtin_bswap32 (x)
854 #define ecb_bswap64(x) __builtin_bswap64 (x)
855#else
856 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
857 ecb_function_ uint16_t
858 ecb_bswap16 (uint16_t x)
859 {
860 return ecb_rotl16 (x, 8);
861 }
862
863 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
864 ecb_function_ uint32_t
865 ecb_bswap32 (uint32_t x)
866 {
867 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
868 }
869
870 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
871 ecb_function_ uint64_t
872 ecb_bswap64 (uint64_t x)
873 {
874 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
875 }
876#endif
877
878#if ECB_GCC_VERSION(4,5)
879 #define ecb_unreachable() __builtin_unreachable ()
880#else
881 /* this seems to work fine, but gcc always emits a warning for it :/ */
882 ecb_inline void ecb_unreachable (void) ecb_noreturn;
883 ecb_inline void ecb_unreachable (void) { }
884#endif
885
886/* try to tell the compiler that some condition is definitely true */
887#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
888
889ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
890ecb_inline unsigned char
891ecb_byteorder_helper (void)
892{
893 const uint32_t u = 0x11223344;
894 return *(unsigned char *)&u;
895}
896
897ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
898ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
899ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
900ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
901
902#if ECB_GCC_VERSION(3,0) || ECB_C99
903 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
904#else
905 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
906#endif
907
908#if __cplusplus
909 template<typename T>
910 static inline T ecb_div_rd (T val, T div)
911 {
912 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
913 }
914 template<typename T>
915 static inline T ecb_div_ru (T val, T div)
916 {
917 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
918 }
919#else
920 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
921 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
922#endif
923
924#if ecb_cplusplus_does_not_suck
925 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
926 template<typename T, int N>
927 static inline int ecb_array_length (const T (&arr)[N])
928 {
929 return N;
930 }
931#else
932 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
933#endif
934
935#endif
936
937/* ECB.H END */
938
939#if ECB_MEMORY_FENCE_NEEDS_PTHREADS
940/* if your architecture doesn't need memory fences, e.g. because it is
941 * single-cpu/core, or if you use libev in a project that doesn't use libev
942 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
943 * libev, in which cases the memory fences become nops.
944 * alternatively, you can remove this #error and link against libpthread,
945 * which will then provide the memory fences.
946 */
947# error "memory fences not defined for your architecture, please report"
948#endif
949
950#ifndef ECB_MEMORY_FENCE
951# define ECB_MEMORY_FENCE do { } while (0)
952# define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
953# define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
954#endif
955
956#define expect_false(cond) ecb_expect_false (cond)
957#define expect_true(cond) ecb_expect_true (cond)
958#define noinline ecb_noinline
959
960#define inline_size ecb_inline
961
962#if EV_FEATURE_CODE
963# define inline_speed ecb_inline
964#else
965# define inline_speed static noinline
966#endif
967
968#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
969
970#if EV_MINPRI == EV_MAXPRI
971# define ABSPRI(w) (((W)w), 0)
972#else
973# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
974#endif
975
976#define EMPTY /* required for microsofts broken pseudo-c compiler */
977#define EMPTY2(a,b) /* used to suppress some warnings */
978
979typedef ev_watcher *W;
980typedef ev_watcher_list *WL;
981typedef ev_watcher_time *WT;
982
983#define ev_active(w) ((W)(w))->active
984#define ev_at(w) ((WT)(w))->at
985
986#if EV_USE_REALTIME
987/* sig_atomic_t is used to avoid per-thread variables or locking but still */
988/* giving it a reasonably high chance of working on typical architectures */
989static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
990#endif
991
992#if EV_USE_MONOTONIC
993static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
994#endif
995
996#ifndef EV_FD_TO_WIN32_HANDLE
997# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
998#endif
999#ifndef EV_WIN32_HANDLE_TO_FD
1000# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
1001#endif
1002#ifndef EV_WIN32_CLOSE_FD
1003# define EV_WIN32_CLOSE_FD(fd) close (fd)
1004#endif
1005
1006#ifdef _WIN32
1007# include "ev_win32.c"
1008#endif
1009
1010/*****************************************************************************/
1011
1012/* define a suitable floor function (only used by periodics atm) */
1013
1014#if EV_USE_FLOOR
1015# include <math.h>
1016# define ev_floor(v) floor (v)
1017#else
1018
1019#include <float.h>
1020
1021/* a floor() replacement function, should be independent of ev_tstamp type */
1022static ev_tstamp noinline
1023ev_floor (ev_tstamp v)
1024{
1025 /* the choice of shift factor is not terribly important */
1026#if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1027 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1028#else
1029 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1030#endif
1031
1032 /* argument too large for an unsigned long? */
1033 if (expect_false (v >= shift))
1034 {
1035 ev_tstamp f;
1036
1037 if (v == v - 1.)
1038 return v; /* very large number */
1039
1040 f = shift * ev_floor (v * (1. / shift));
1041 return f + ev_floor (v - f);
1042 }
1043
1044 /* special treatment for negative args? */
1045 if (expect_false (v < 0.))
1046 {
1047 ev_tstamp f = -ev_floor (-v);
1048
1049 return f - (f == v ? 0 : 1);
1050 }
1051
1052 /* fits into an unsigned long */
1053 return (unsigned long)v;
1054}
1055
1056#endif
1057
1058/*****************************************************************************/
1059
1060#ifdef __linux
1061# include <sys/utsname.h>
1062#endif
1063
1064static unsigned int noinline ecb_cold
1065ev_linux_version (void)
1066{
1067#ifdef __linux
1068 unsigned int v = 0;
1069 struct utsname buf;
1070 int i;
1071 char *p = buf.release;
1072
1073 if (uname (&buf))
1074 return 0;
1075
1076 for (i = 3+1; --i; )
1077 {
1078 unsigned int c = 0;
1079
1080 for (;;)
1081 {
1082 if (*p >= '0' && *p <= '9')
1083 c = c * 10 + *p++ - '0';
1084 else
1085 {
1086 p += *p == '.';
1087 break;
1088 }
1089 }
1090
1091 v = (v << 8) | c;
1092 }
1093
1094 return v;
1095#else
1096 return 0;
1097#endif
1098}
1099
1100/*****************************************************************************/
1101
1102#if EV_AVOID_STDIO
1103static void noinline ecb_cold
1104ev_printerr (const char *msg)
1105{
1106 write (STDERR_FILENO, msg, strlen (msg));
1107}
1108#endif
1109
1110static void (*syserr_cb)(const char *msg) EV_THROW;
1111
1112void ecb_cold
1113ev_set_syserr_cb (void (*cb)(const char *msg)) EV_THROW
1114{
1115 syserr_cb = cb;
1116}
1117
1118static void noinline ecb_cold
1119ev_syserr (const char *msg)
1120{
1121 if (!msg)
1122 msg = "(libev) system error";
1123
1124 if (syserr_cb)
1125 syserr_cb (msg);
1126 else
1127 {
1128#if EV_AVOID_STDIO
1129 ev_printerr (msg);
1130 ev_printerr (": ");
1131 ev_printerr (strerror (errno));
1132 ev_printerr ("\n");
1133#else
1134 perror (msg);
1135#endif
1136 abort ();
1137 }
1138}
1139
1140static void *
1141ev_realloc_emul (void *ptr, long size)
1142{
1143#if __GLIBC__
1144 return realloc (ptr, size);
1145#else
1146 /* some systems, notably openbsd and darwin, fail to properly
1147 * implement realloc (x, 0) (as required by both ansi c-89 and
1148 * the single unix specification, so work around them here.
1149 */
1150
1151 if (size)
1152 return realloc (ptr, size);
1153
1154 free (ptr);
1155 return 0;
1156#endif
1157}
1158
1159static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1160
1161void ecb_cold
1162ev_set_allocator (void *(*cb)(void *ptr, long size)) EV_THROW
1163{
1164 alloc = cb;
1165}
1166
1167inline_speed void *
1168ev_realloc (void *ptr, long size)
1169{
1170 ptr = alloc (ptr, size);
1171
1172 if (!ptr && size)
1173 {
1174#if EV_AVOID_STDIO
1175 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1176#else
1177 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1178#endif
1179 abort ();
1180 }
1181
1182 return ptr;
1183}
1184
1185#define ev_malloc(size) ev_realloc (0, (size))
1186#define ev_free(ptr) ev_realloc ((ptr), 0)
1187
1188/*****************************************************************************/
1189
1190/* set in reify when reification needed */
1191#define EV_ANFD_REIFY 1
1192
1193/* file descriptor info structure */
1194typedef struct
1195{
1196 WL head;
1197 unsigned char events; /* the events watched for */
1198 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1199 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1200 unsigned char unused;
1201#if EV_USE_EPOLL
1202 unsigned int egen; /* generation counter to counter epoll bugs */
1203#endif
1204#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1205 SOCKET handle;
1206#endif
1207#if EV_USE_IOCP
1208 OVERLAPPED or, ow;
1209#endif
1210} ANFD;
1211
1212/* stores the pending event set for a given watcher */
1213typedef struct
1214{
1215 W w;
1216 int events; /* the pending event set for the given watcher */
1217} ANPENDING;
1218
1219#if EV_USE_INOTIFY
1220/* hash table entry per inotify-id */
1221typedef struct
1222{
1223 WL head;
1224} ANFS;
1225#endif
1226
1227/* Heap Entry */
1228#if EV_HEAP_CACHE_AT
1229 /* a heap element */
1230 typedef struct {
1231 ev_tstamp at;
1232 WT w;
1233 } ANHE;
1234
1235 #define ANHE_w(he) (he).w /* access watcher, read-write */
1236 #define ANHE_at(he) (he).at /* access cached at, read-only */
1237 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1238#else
1239 /* a heap element */
1240 typedef WT ANHE;
1241
1242 #define ANHE_w(he) (he)
1243 #define ANHE_at(he) (he)->at
1244 #define ANHE_at_cache(he)
1245#endif
1246
1247#if EV_MULTIPLICITY
1248
1249 struct ev_loop
1250 {
1251 ev_tstamp ev_rt_now;
1252 #define ev_rt_now ((loop)->ev_rt_now)
1253 #define VAR(name,decl) decl;
1254 #include "ev_vars.h"
1255 #undef VAR
1256 };
1257 #include "ev_wrap.h"
1258
1259 static struct ev_loop default_loop_struct;
1260 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1261
1262#else
1263
1264 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1265 #define VAR(name,decl) static decl;
1266 #include "ev_vars.h"
1267 #undef VAR
1268
1269 static int ev_default_loop_ptr;
1270
1271#endif
1272
1273#if EV_FEATURE_API
1274# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1275# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1276# define EV_INVOKE_PENDING invoke_cb (EV_A)
1277#else
1278# define EV_RELEASE_CB (void)0
1279# define EV_ACQUIRE_CB (void)0
1280# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1281#endif
1282
1283#define EVBREAK_RECURSE 0x80
1284
1285/*****************************************************************************/
1286
1287#ifndef EV_HAVE_EV_TIME
130ev_tstamp 1288ev_tstamp
131ev_time (void) 1289ev_time (void) EV_THROW
132{ 1290{
133#if EV_USE_REALTIME 1291#if EV_USE_REALTIME
1292 if (expect_true (have_realtime))
1293 {
134 struct timespec ts; 1294 struct timespec ts;
135 clock_gettime (CLOCK_REALTIME, &ts); 1295 clock_gettime (CLOCK_REALTIME, &ts);
136 return ts.tv_sec + ts.tv_nsec * 1e-9; 1296 return ts.tv_sec + ts.tv_nsec * 1e-9;
137#else 1297 }
1298#endif
1299
138 struct timeval tv; 1300 struct timeval tv;
139 gettimeofday (&tv, 0); 1301 gettimeofday (&tv, 0);
140 return tv.tv_sec + tv.tv_usec * 1e-6; 1302 return tv.tv_sec + tv.tv_usec * 1e-6;
141#endif
142} 1303}
1304#endif
143 1305
144static ev_tstamp 1306inline_size ev_tstamp
145get_clock (void) 1307get_clock (void)
146{ 1308{
147#if EV_USE_MONOTONIC 1309#if EV_USE_MONOTONIC
148 if (expect_true (have_monotonic)) 1310 if (expect_true (have_monotonic))
149 { 1311 {
… …
154#endif 1316#endif
155 1317
156 return ev_time (); 1318 return ev_time ();
157} 1319}
158 1320
159#define array_roundsize(base,n) ((n) | 4 & ~3) 1321#if EV_MULTIPLICITY
1322ev_tstamp
1323ev_now (EV_P) EV_THROW
1324{
1325 return ev_rt_now;
1326}
1327#endif
160 1328
161#define array_needsize(base,cur,cnt,init) \ 1329void
162 if (expect_false ((cnt) > cur)) \ 1330ev_sleep (ev_tstamp delay) EV_THROW
163 { \ 1331{
164 int newcnt = cur; \ 1332 if (delay > 0.)
165 do \
166 { \
167 newcnt = array_roundsize (base, newcnt << 1); \
168 } \
169 while ((cnt) > newcnt); \
170 \
171 base = realloc (base, sizeof (*base) * (newcnt)); \
172 init (base + cur, newcnt - cur); \
173 cur = newcnt; \
174 } 1333 {
1334#if EV_USE_NANOSLEEP
1335 struct timespec ts;
1336
1337 EV_TS_SET (ts, delay);
1338 nanosleep (&ts, 0);
1339#elif defined _WIN32
1340 Sleep ((unsigned long)(delay * 1e3));
1341#else
1342 struct timeval tv;
1343
1344 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1345 /* something not guaranteed by newer posix versions, but guaranteed */
1346 /* by older ones */
1347 EV_TV_SET (tv, delay);
1348 select (0, 0, 0, 0, &tv);
1349#endif
1350 }
1351}
175 1352
176/*****************************************************************************/ 1353/*****************************************************************************/
177 1354
178typedef struct 1355#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
179{
180 struct ev_watcher_list *head;
181 unsigned char events;
182 unsigned char reify;
183} ANFD;
184 1356
185static ANFD *anfds; 1357/* find a suitable new size for the given array, */
186static int anfdmax; 1358/* hopefully by rounding to a nice-to-malloc size */
187 1359inline_size int
188static void 1360array_nextsize (int elem, int cur, int cnt)
189anfds_init (ANFD *base, int count)
190{ 1361{
191 while (count--) 1362 int ncur = cur + 1;
192 {
193 base->head = 0;
194 base->events = EV_NONE;
195 base->reify = 0;
196 1363
197 ++base; 1364 do
1365 ncur <<= 1;
1366 while (cnt > ncur);
1367
1368 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1369 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
198 } 1370 {
199} 1371 ncur *= elem;
200 1372 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
201typedef struct 1373 ncur = ncur - sizeof (void *) * 4;
202{ 1374 ncur /= elem;
203 W w;
204 int events;
205} ANPENDING;
206
207static ANPENDING *pendings [NUMPRI];
208static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
209
210static void
211event (W w, int events)
212{
213 if (w->pending)
214 { 1375 }
1376
1377 return ncur;
1378}
1379
1380static void * noinline ecb_cold
1381array_realloc (int elem, void *base, int *cur, int cnt)
1382{
1383 *cur = array_nextsize (elem, *cur, cnt);
1384 return ev_realloc (base, elem * *cur);
1385}
1386
1387#define array_init_zero(base,count) \
1388 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1389
1390#define array_needsize(type,base,cur,cnt,init) \
1391 if (expect_false ((cnt) > (cur))) \
1392 { \
1393 int ecb_unused ocur_ = (cur); \
1394 (base) = (type *)array_realloc \
1395 (sizeof (type), (base), &(cur), (cnt)); \
1396 init ((base) + (ocur_), (cur) - ocur_); \
1397 }
1398
1399#if 0
1400#define array_slim(type,stem) \
1401 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1402 { \
1403 stem ## max = array_roundsize (stem ## cnt >> 1); \
1404 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1405 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1406 }
1407#endif
1408
1409#define array_free(stem, idx) \
1410 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1411
1412/*****************************************************************************/
1413
1414/* dummy callback for pending events */
1415static void noinline
1416pendingcb (EV_P_ ev_prepare *w, int revents)
1417{
1418}
1419
1420void noinline
1421ev_feed_event (EV_P_ void *w, int revents) EV_THROW
1422{
1423 W w_ = (W)w;
1424 int pri = ABSPRI (w_);
1425
1426 if (expect_false (w_->pending))
1427 pendings [pri][w_->pending - 1].events |= revents;
1428 else
1429 {
1430 w_->pending = ++pendingcnt [pri];
1431 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1432 pendings [pri][w_->pending - 1].w = w_;
215 pendings [ABSPRI (w)][w->pending - 1].events |= events; 1433 pendings [pri][w_->pending - 1].events = revents;
216 return;
217 } 1434 }
218 1435
219 w->pending = ++pendingcnt [ABSPRI (w)]; 1436 pendingpri = NUMPRI - 1;
220 array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
221 pendings [ABSPRI (w)][w->pending - 1].w = w;
222 pendings [ABSPRI (w)][w->pending - 1].events = events;
223} 1437}
224 1438
225static void 1439inline_speed void
1440feed_reverse (EV_P_ W w)
1441{
1442 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1443 rfeeds [rfeedcnt++] = w;
1444}
1445
1446inline_size void
1447feed_reverse_done (EV_P_ int revents)
1448{
1449 do
1450 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1451 while (rfeedcnt);
1452}
1453
1454inline_speed void
226queue_events (W *events, int eventcnt, int type) 1455queue_events (EV_P_ W *events, int eventcnt, int type)
227{ 1456{
228 int i; 1457 int i;
229 1458
230 for (i = 0; i < eventcnt; ++i) 1459 for (i = 0; i < eventcnt; ++i)
231 event (events [i], type); 1460 ev_feed_event (EV_A_ events [i], type);
232} 1461}
233 1462
234static void 1463/*****************************************************************************/
1464
1465inline_speed void
235fd_event (int fd, int events) 1466fd_event_nocheck (EV_P_ int fd, int revents)
236{ 1467{
237 ANFD *anfd = anfds + fd; 1468 ANFD *anfd = anfds + fd;
238 struct ev_io *w; 1469 ev_io *w;
239 1470
240 for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next) 1471 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
241 { 1472 {
242 int ev = w->events & events; 1473 int ev = w->events & revents;
243 1474
244 if (ev) 1475 if (ev)
245 event ((W)w, ev); 1476 ev_feed_event (EV_A_ (W)w, ev);
246 } 1477 }
247} 1478}
248 1479
249/*****************************************************************************/ 1480/* do not submit kernel events for fds that have reify set */
1481/* because that means they changed while we were polling for new events */
1482inline_speed void
1483fd_event (EV_P_ int fd, int revents)
1484{
1485 ANFD *anfd = anfds + fd;
250 1486
251static int *fdchanges; 1487 if (expect_true (!anfd->reify))
252static int fdchangemax, fdchangecnt; 1488 fd_event_nocheck (EV_A_ fd, revents);
1489}
253 1490
254static void 1491void
255fd_reify (void) 1492ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
1493{
1494 if (fd >= 0 && fd < anfdmax)
1495 fd_event_nocheck (EV_A_ fd, revents);
1496}
1497
1498/* make sure the external fd watch events are in-sync */
1499/* with the kernel/libev internal state */
1500inline_size void
1501fd_reify (EV_P)
256{ 1502{
257 int i; 1503 int i;
258 1504
1505#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
259 for (i = 0; i < fdchangecnt; ++i) 1506 for (i = 0; i < fdchangecnt; ++i)
260 { 1507 {
261 int fd = fdchanges [i]; 1508 int fd = fdchanges [i];
262 ANFD *anfd = anfds + fd; 1509 ANFD *anfd = anfds + fd;
263 struct ev_io *w;
264 1510
265 int events = 0; 1511 if (anfd->reify & EV__IOFDSET && anfd->head)
266
267 for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
268 events |= w->events;
269
270 anfd->reify = 0;
271
272 if (anfd->events != events)
273 { 1512 {
1513 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1514
1515 if (handle != anfd->handle)
1516 {
1517 unsigned long arg;
1518
1519 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1520
1521 /* handle changed, but fd didn't - we need to do it in two steps */
274 method_modify (fd, anfd->events, events); 1522 backend_modify (EV_A_ fd, anfd->events, 0);
275 anfd->events = events; 1523 anfd->events = 0;
1524 anfd->handle = handle;
1525 }
276 } 1526 }
277 } 1527 }
1528#endif
1529
1530 for (i = 0; i < fdchangecnt; ++i)
1531 {
1532 int fd = fdchanges [i];
1533 ANFD *anfd = anfds + fd;
1534 ev_io *w;
1535
1536 unsigned char o_events = anfd->events;
1537 unsigned char o_reify = anfd->reify;
1538
1539 anfd->reify = 0;
1540
1541 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1542 {
1543 anfd->events = 0;
1544
1545 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1546 anfd->events |= (unsigned char)w->events;
1547
1548 if (o_events != anfd->events)
1549 o_reify = EV__IOFDSET; /* actually |= */
1550 }
1551
1552 if (o_reify & EV__IOFDSET)
1553 backend_modify (EV_A_ fd, o_events, anfd->events);
1554 }
278 1555
279 fdchangecnt = 0; 1556 fdchangecnt = 0;
280} 1557}
281 1558
282static void 1559/* something about the given fd changed */
283fd_change (int fd) 1560inline_size void
1561fd_change (EV_P_ int fd, int flags)
284{ 1562{
285 if (anfds [fd].reify || fdchangecnt < 0) 1563 unsigned char reify = anfds [fd].reify;
286 return;
287
288 anfds [fd].reify = 1; 1564 anfds [fd].reify |= flags;
289 1565
1566 if (expect_true (!reify))
1567 {
290 ++fdchangecnt; 1568 ++fdchangecnt;
291 array_needsize (fdchanges, fdchangemax, fdchangecnt, ); 1569 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
292 fdchanges [fdchangecnt - 1] = fd; 1570 fdchanges [fdchangecnt - 1] = fd;
1571 }
293} 1572}
294 1573
295static void 1574/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1575inline_speed void ecb_cold
296fd_kill (int fd) 1576fd_kill (EV_P_ int fd)
297{ 1577{
298 struct ev_io *w; 1578 ev_io *w;
299 1579
300 while ((w = (struct ev_io *)anfds [fd].head)) 1580 while ((w = (ev_io *)anfds [fd].head))
301 { 1581 {
302 ev_io_stop (w); 1582 ev_io_stop (EV_A_ w);
303 event ((W)w, EV_ERROR | EV_READ | EV_WRITE); 1583 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
304 } 1584 }
1585}
1586
1587/* check whether the given fd is actually valid, for error recovery */
1588inline_size int ecb_cold
1589fd_valid (int fd)
1590{
1591#ifdef _WIN32
1592 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1593#else
1594 return fcntl (fd, F_GETFD) != -1;
1595#endif
305} 1596}
306 1597
307/* called on EBADF to verify fds */ 1598/* called on EBADF to verify fds */
308static void 1599static void noinline ecb_cold
309fd_ebadf (void) 1600fd_ebadf (EV_P)
310{ 1601{
311 int fd; 1602 int fd;
312 1603
313 for (fd = 0; fd < anfdmax; ++fd) 1604 for (fd = 0; fd < anfdmax; ++fd)
314 if (anfds [fd].events) 1605 if (anfds [fd].events)
315 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF) 1606 if (!fd_valid (fd) && errno == EBADF)
316 fd_kill (fd); 1607 fd_kill (EV_A_ fd);
317} 1608}
318 1609
319/* called on ENOMEM in select/poll to kill some fds and retry */ 1610/* called on ENOMEM in select/poll to kill some fds and retry */
320static void 1611static void noinline ecb_cold
321fd_enomem (void) 1612fd_enomem (EV_P)
322{ 1613{
323 int fd = anfdmax; 1614 int fd;
324 1615
325 while (fd--) 1616 for (fd = anfdmax; fd--; )
326 if (anfds [fd].events) 1617 if (anfds [fd].events)
327 { 1618 {
328 close (fd);
329 fd_kill (fd); 1619 fd_kill (EV_A_ fd);
330 return; 1620 break;
331 } 1621 }
332} 1622}
333 1623
1624/* usually called after fork if backend needs to re-arm all fds from scratch */
1625static void noinline
1626fd_rearm_all (EV_P)
1627{
1628 int fd;
1629
1630 for (fd = 0; fd < anfdmax; ++fd)
1631 if (anfds [fd].events)
1632 {
1633 anfds [fd].events = 0;
1634 anfds [fd].emask = 0;
1635 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1636 }
1637}
1638
1639/* used to prepare libev internal fd's */
1640/* this is not fork-safe */
1641inline_speed void
1642fd_intern (int fd)
1643{
1644#ifdef _WIN32
1645 unsigned long arg = 1;
1646 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1647#else
1648 fcntl (fd, F_SETFD, FD_CLOEXEC);
1649 fcntl (fd, F_SETFL, O_NONBLOCK);
1650#endif
1651}
1652
334/*****************************************************************************/ 1653/*****************************************************************************/
335 1654
336static struct ev_timer **timers; 1655/*
337static int timermax, timercnt; 1656 * the heap functions want a real array index. array index 0 is guaranteed to not
1657 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1658 * the branching factor of the d-tree.
1659 */
338 1660
339static struct ev_periodic **periodics; 1661/*
340static int periodicmax, periodiccnt; 1662 * at the moment we allow libev the luxury of two heaps,
1663 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1664 * which is more cache-efficient.
1665 * the difference is about 5% with 50000+ watchers.
1666 */
1667#if EV_USE_4HEAP
341 1668
1669#define DHEAP 4
1670#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1671#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1672#define UPHEAP_DONE(p,k) ((p) == (k))
1673
1674/* away from the root */
1675inline_speed void
1676downheap (ANHE *heap, int N, int k)
1677{
1678 ANHE he = heap [k];
1679 ANHE *E = heap + N + HEAP0;
1680
1681 for (;;)
1682 {
1683 ev_tstamp minat;
1684 ANHE *minpos;
1685 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1686
1687 /* find minimum child */
1688 if (expect_true (pos + DHEAP - 1 < E))
1689 {
1690 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1691 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1692 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1693 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1694 }
1695 else if (pos < E)
1696 {
1697 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1698 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1699 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1700 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1701 }
1702 else
1703 break;
1704
1705 if (ANHE_at (he) <= minat)
1706 break;
1707
1708 heap [k] = *minpos;
1709 ev_active (ANHE_w (*minpos)) = k;
1710
1711 k = minpos - heap;
1712 }
1713
1714 heap [k] = he;
1715 ev_active (ANHE_w (he)) = k;
1716}
1717
1718#else /* 4HEAP */
1719
1720#define HEAP0 1
1721#define HPARENT(k) ((k) >> 1)
1722#define UPHEAP_DONE(p,k) (!(p))
1723
1724/* away from the root */
1725inline_speed void
1726downheap (ANHE *heap, int N, int k)
1727{
1728 ANHE he = heap [k];
1729
1730 for (;;)
1731 {
1732 int c = k << 1;
1733
1734 if (c >= N + HEAP0)
1735 break;
1736
1737 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1738 ? 1 : 0;
1739
1740 if (ANHE_at (he) <= ANHE_at (heap [c]))
1741 break;
1742
1743 heap [k] = heap [c];
1744 ev_active (ANHE_w (heap [k])) = k;
1745
1746 k = c;
1747 }
1748
1749 heap [k] = he;
1750 ev_active (ANHE_w (he)) = k;
1751}
1752#endif
1753
1754/* towards the root */
1755inline_speed void
1756upheap (ANHE *heap, int k)
1757{
1758 ANHE he = heap [k];
1759
1760 for (;;)
1761 {
1762 int p = HPARENT (k);
1763
1764 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1765 break;
1766
1767 heap [k] = heap [p];
1768 ev_active (ANHE_w (heap [k])) = k;
1769 k = p;
1770 }
1771
1772 heap [k] = he;
1773 ev_active (ANHE_w (he)) = k;
1774}
1775
1776/* move an element suitably so it is in a correct place */
1777inline_size void
1778adjustheap (ANHE *heap, int N, int k)
1779{
1780 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1781 upheap (heap, k);
1782 else
1783 downheap (heap, N, k);
1784}
1785
1786/* rebuild the heap: this function is used only once and executed rarely */
1787inline_size void
1788reheap (ANHE *heap, int N)
1789{
1790 int i;
1791
1792 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1793 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1794 for (i = 0; i < N; ++i)
1795 upheap (heap, i + HEAP0);
1796}
1797
1798/*****************************************************************************/
1799
1800/* associate signal watchers to a signal signal */
1801typedef struct
1802{
1803 EV_ATOMIC_T pending;
1804#if EV_MULTIPLICITY
1805 EV_P;
1806#endif
1807 WL head;
1808} ANSIG;
1809
1810static ANSIG signals [EV_NSIG - 1];
1811
1812/*****************************************************************************/
1813
1814#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1815
1816static void noinline ecb_cold
1817evpipe_init (EV_P)
1818{
1819 if (!ev_is_active (&pipe_w))
1820 {
1821# if EV_USE_EVENTFD
1822 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1823 if (evfd < 0 && errno == EINVAL)
1824 evfd = eventfd (0, 0);
1825
1826 if (evfd >= 0)
1827 {
1828 evpipe [0] = -1;
1829 fd_intern (evfd); /* doing it twice doesn't hurt */
1830 ev_io_set (&pipe_w, evfd, EV_READ);
1831 }
1832 else
1833# endif
1834 {
1835 while (pipe (evpipe))
1836 ev_syserr ("(libev) error creating signal/async pipe");
1837
1838 fd_intern (evpipe [0]);
1839 fd_intern (evpipe [1]);
1840 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1841 }
1842
1843 ev_io_start (EV_A_ &pipe_w);
1844 ev_unref (EV_A); /* watcher should not keep loop alive */
1845 }
1846}
1847
1848inline_speed void
1849evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1850{
1851 ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
1852
1853 if (expect_true (*flag))
1854 return;
1855
1856 *flag = 1;
1857
1858 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1859
1860 pipe_write_skipped = 1;
1861
1862 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1863
1864 if (pipe_write_wanted)
1865 {
1866 int old_errno;
1867
1868 pipe_write_skipped = 0; /* just an optimisation, no fence needed */
1869
1870 old_errno = errno; /* save errno because write will clobber it */
1871
1872#if EV_USE_EVENTFD
1873 if (evfd >= 0)
1874 {
1875 uint64_t counter = 1;
1876 write (evfd, &counter, sizeof (uint64_t));
1877 }
1878 else
1879#endif
1880 {
1881#ifdef _WIN32
1882 WSABUF buf;
1883 DWORD sent;
1884 buf.buf = &buf;
1885 buf.len = 1;
1886 WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
1887#else
1888 write (evpipe [1], &(evpipe [1]), 1);
1889#endif
1890 }
1891
1892 errno = old_errno;
1893 }
1894}
1895
1896/* called whenever the libev signal pipe */
1897/* got some events (signal, async) */
342static void 1898static void
343upheap (WT *timers, int k) 1899pipecb (EV_P_ ev_io *iow, int revents)
344{ 1900{
345 WT w = timers [k]; 1901 int i;
346 1902
347 while (k && timers [k >> 1]->at > w->at) 1903 if (revents & EV_READ)
348 {
349 timers [k] = timers [k >> 1];
350 timers [k]->active = k + 1;
351 k >>= 1;
352 } 1904 {
1905#if EV_USE_EVENTFD
1906 if (evfd >= 0)
1907 {
1908 uint64_t counter;
1909 read (evfd, &counter, sizeof (uint64_t));
1910 }
1911 else
1912#endif
1913 {
1914 char dummy[4];
1915#ifdef _WIN32
1916 WSABUF buf;
1917 DWORD recvd;
1918 buf.buf = dummy;
1919 buf.len = sizeof (dummy);
1920 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, 0, 0, 0);
1921#else
1922 read (evpipe [0], &dummy, sizeof (dummy));
1923#endif
1924 }
1925 }
353 1926
354 timers [k] = w; 1927 pipe_write_skipped = 0;
355 timers [k]->active = k + 1;
356 1928
1929 ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
1930
1931#if EV_SIGNAL_ENABLE
1932 if (sig_pending)
1933 {
1934 sig_pending = 0;
1935
1936 ECB_MEMORY_FENCE_RELEASE;
1937
1938 for (i = EV_NSIG - 1; i--; )
1939 if (expect_false (signals [i].pending))
1940 ev_feed_signal_event (EV_A_ i + 1);
1941 }
1942#endif
1943
1944#if EV_ASYNC_ENABLE
1945 if (async_pending)
1946 {
1947 async_pending = 0;
1948
1949 ECB_MEMORY_FENCE_RELEASE;
1950
1951 for (i = asynccnt; i--; )
1952 if (asyncs [i]->sent)
1953 {
1954 asyncs [i]->sent = 0;
1955 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1956 }
1957 }
1958#endif
1959}
1960
1961/*****************************************************************************/
1962
1963void
1964ev_feed_signal (int signum) EV_THROW
1965{
1966#if EV_MULTIPLICITY
1967 EV_P = signals [signum - 1].loop;
1968
1969 if (!EV_A)
1970 return;
1971#endif
1972
1973 if (!ev_active (&pipe_w))
1974 return;
1975
1976 signals [signum - 1].pending = 1;
1977 evpipe_write (EV_A_ &sig_pending);
357} 1978}
358 1979
359static void 1980static void
360downheap (WT *timers, int N, int k) 1981ev_sighandler (int signum)
361{ 1982{
362 WT w = timers [k]; 1983#ifdef _WIN32
1984 signal (signum, ev_sighandler);
1985#endif
363 1986
364 while (k < (N >> 1)) 1987 ev_feed_signal (signum);
365 { 1988}
366 int j = k << 1;
367 1989
368 if (j + 1 < N && timers [j]->at > timers [j + 1]->at) 1990void noinline
369 ++j; 1991ev_feed_signal_event (EV_P_ int signum) EV_THROW
1992{
1993 WL w;
370 1994
371 if (w->at <= timers [j]->at) 1995 if (expect_false (signum <= 0 || signum > EV_NSIG))
1996 return;
1997
1998 --signum;
1999
2000#if EV_MULTIPLICITY
2001 /* it is permissible to try to feed a signal to the wrong loop */
2002 /* or, likely more useful, feeding a signal nobody is waiting for */
2003
2004 if (expect_false (signals [signum].loop != EV_A))
2005 return;
2006#endif
2007
2008 signals [signum].pending = 0;
2009
2010 for (w = signals [signum].head; w; w = w->next)
2011 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2012}
2013
2014#if EV_USE_SIGNALFD
2015static void
2016sigfdcb (EV_P_ ev_io *iow, int revents)
2017{
2018 struct signalfd_siginfo si[2], *sip; /* these structs are big */
2019
2020 for (;;)
2021 {
2022 ssize_t res = read (sigfd, si, sizeof (si));
2023
2024 /* not ISO-C, as res might be -1, but works with SuS */
2025 for (sip = si; (char *)sip < (char *)si + res; ++sip)
2026 ev_feed_signal_event (EV_A_ sip->ssi_signo);
2027
2028 if (res < (ssize_t)sizeof (si))
372 break; 2029 break;
373
374 timers [k] = timers [j];
375 timers [k]->active = k + 1;
376 k = j;
377 } 2030 }
378
379 timers [k] = w;
380 timers [k]->active = k + 1;
381} 2031}
2032#endif
2033
2034#endif
382 2035
383/*****************************************************************************/ 2036/*****************************************************************************/
384 2037
385typedef struct 2038#if EV_CHILD_ENABLE
386{ 2039static WL childs [EV_PID_HASHSIZE];
387 struct ev_watcher_list *head;
388 sig_atomic_t volatile gotsig;
389} ANSIG;
390 2040
391static ANSIG *signals;
392static int signalmax;
393
394static int sigpipe [2];
395static sig_atomic_t volatile gotsig;
396static struct ev_io sigev;
397
398static void
399signals_init (ANSIG *base, int count)
400{
401 while (count--)
402 {
403 base->head = 0;
404 base->gotsig = 0;
405
406 ++base;
407 }
408}
409
410static void
411sighandler (int signum)
412{
413 signals [signum - 1].gotsig = 1;
414
415 if (!gotsig)
416 {
417 int old_errno = errno;
418 gotsig = 1;
419 write (sigpipe [1], &signum, 1);
420 errno = old_errno;
421 }
422}
423
424static void
425sigcb (struct ev_io *iow, int revents)
426{
427 struct ev_watcher_list *w;
428 int signum;
429
430 read (sigpipe [0], &revents, 1);
431 gotsig = 0;
432
433 for (signum = signalmax; signum--; )
434 if (signals [signum].gotsig)
435 {
436 signals [signum].gotsig = 0;
437
438 for (w = signals [signum].head; w; w = w->next)
439 event ((W)w, EV_SIGNAL);
440 }
441}
442
443static void
444siginit (void)
445{
446#ifndef WIN32
447 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
448 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
449
450 /* rather than sort out wether we really need nb, set it */
451 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
452 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
453#endif
454
455 ev_io_set (&sigev, sigpipe [0], EV_READ);
456 ev_io_start (&sigev);
457}
458
459/*****************************************************************************/
460
461static struct ev_idle **idles;
462static int idlemax, idlecnt;
463
464static struct ev_prepare **prepares;
465static int preparemax, preparecnt;
466
467static struct ev_check **checks;
468static int checkmax, checkcnt;
469
470/*****************************************************************************/
471
472static struct ev_child *childs [PID_HASHSIZE];
473static struct ev_signal childev; 2041static ev_signal childev;
474 2042
475#ifndef WIN32 2043#ifndef WIFCONTINUED
2044# define WIFCONTINUED(status) 0
2045#endif
2046
2047/* handle a single child status event */
2048inline_speed void
2049child_reap (EV_P_ int chain, int pid, int status)
2050{
2051 ev_child *w;
2052 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2053
2054 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2055 {
2056 if ((w->pid == pid || !w->pid)
2057 && (!traced || (w->flags & 1)))
2058 {
2059 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2060 w->rpid = pid;
2061 w->rstatus = status;
2062 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2063 }
2064 }
2065}
476 2066
477#ifndef WCONTINUED 2067#ifndef WCONTINUED
478# define WCONTINUED 0 2068# define WCONTINUED 0
479#endif 2069#endif
480 2070
2071/* called on sigchld etc., calls waitpid */
481static void 2072static void
482child_reap (struct ev_signal *sw, int chain, int pid, int status)
483{
484 struct ev_child *w;
485
486 for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
487 if (w->pid == pid || !w->pid)
488 {
489 w->priority = sw->priority; /* need to do it *now* */
490 w->rpid = pid;
491 w->rstatus = status;
492 event ((W)w, EV_CHILD);
493 }
494}
495
496static void
497childcb (struct ev_signal *sw, int revents) 2073childcb (EV_P_ ev_signal *sw, int revents)
498{ 2074{
499 int pid, status; 2075 int pid, status;
500 2076
2077 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
501 if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED))) 2078 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
502 { 2079 if (!WCONTINUED
2080 || errno != EINVAL
2081 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2082 return;
2083
503 /* make sure we are called again until all childs have been reaped */ 2084 /* make sure we are called again until all children have been reaped */
2085 /* we need to do it this way so that the callback gets called before we continue */
504 event ((W)sw, EV_SIGNAL); 2086 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
505 2087
506 child_reap (sw, pid, pid, status); 2088 child_reap (EV_A_ pid, pid, status);
2089 if ((EV_PID_HASHSIZE) > 1)
507 child_reap (sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */ 2090 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
508 }
509} 2091}
510 2092
511#endif 2093#endif
512 2094
513/*****************************************************************************/ 2095/*****************************************************************************/
514 2096
2097#if EV_USE_IOCP
2098# include "ev_iocp.c"
2099#endif
2100#if EV_USE_PORT
2101# include "ev_port.c"
2102#endif
515#if EV_USE_KQUEUE 2103#if EV_USE_KQUEUE
516# include "ev_kqueue.c" 2104# include "ev_kqueue.c"
517#endif 2105#endif
518#if EV_USE_EPOLL 2106#if EV_USE_EPOLL
519# include "ev_epoll.c" 2107# include "ev_epoll.c"
… …
523#endif 2111#endif
524#if EV_USE_SELECT 2112#if EV_USE_SELECT
525# include "ev_select.c" 2113# include "ev_select.c"
526#endif 2114#endif
527 2115
528int 2116int ecb_cold
529ev_version_major (void) 2117ev_version_major (void) EV_THROW
530{ 2118{
531 return EV_VERSION_MAJOR; 2119 return EV_VERSION_MAJOR;
532} 2120}
533 2121
534int 2122int ecb_cold
535ev_version_minor (void) 2123ev_version_minor (void) EV_THROW
536{ 2124{
537 return EV_VERSION_MINOR; 2125 return EV_VERSION_MINOR;
538} 2126}
539 2127
540/* return true if we are running with elevated privileges and should ignore env variables */ 2128/* return true if we are running with elevated privileges and should ignore env variables */
541static int 2129int inline_size ecb_cold
542enable_secure () 2130enable_secure (void)
543{ 2131{
544#ifdef WIN32 2132#ifdef _WIN32
545 return 0; 2133 return 0;
546#else 2134#else
547 return getuid () != geteuid () 2135 return getuid () != geteuid ()
548 || getgid () != getegid (); 2136 || getgid () != getegid ();
549#endif 2137#endif
550} 2138}
551 2139
552int ev_init (int methods) 2140unsigned int ecb_cold
2141ev_supported_backends (void) EV_THROW
553{ 2142{
554 if (!ev_method) 2143 unsigned int flags = 0;
2144
2145 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2146 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2147 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2148 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2149 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2150
2151 return flags;
2152}
2153
2154unsigned int ecb_cold
2155ev_recommended_backends (void) EV_THROW
2156{
2157 unsigned int flags = ev_supported_backends ();
2158
2159#ifndef __NetBSD__
2160 /* kqueue is borked on everything but netbsd apparently */
2161 /* it usually doesn't work correctly on anything but sockets and pipes */
2162 flags &= ~EVBACKEND_KQUEUE;
2163#endif
2164#ifdef __APPLE__
2165 /* only select works correctly on that "unix-certified" platform */
2166 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2167 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2168#endif
2169#ifdef __FreeBSD__
2170 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2171#endif
2172
2173 return flags;
2174}
2175
2176unsigned int ecb_cold
2177ev_embeddable_backends (void) EV_THROW
2178{
2179 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2180
2181 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2182 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2183 flags &= ~EVBACKEND_EPOLL;
2184
2185 return flags;
2186}
2187
2188unsigned int
2189ev_backend (EV_P) EV_THROW
2190{
2191 return backend;
2192}
2193
2194#if EV_FEATURE_API
2195unsigned int
2196ev_iteration (EV_P) EV_THROW
2197{
2198 return loop_count;
2199}
2200
2201unsigned int
2202ev_depth (EV_P) EV_THROW
2203{
2204 return loop_depth;
2205}
2206
2207void
2208ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2209{
2210 io_blocktime = interval;
2211}
2212
2213void
2214ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2215{
2216 timeout_blocktime = interval;
2217}
2218
2219void
2220ev_set_userdata (EV_P_ void *data) EV_THROW
2221{
2222 userdata = data;
2223}
2224
2225void *
2226ev_userdata (EV_P) EV_THROW
2227{
2228 return userdata;
2229}
2230
2231void
2232ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) EV_THROW
2233{
2234 invoke_cb = invoke_pending_cb;
2235}
2236
2237void
2238ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
2239{
2240 release_cb = release;
2241 acquire_cb = acquire;
2242}
2243#endif
2244
2245/* initialise a loop structure, must be zero-initialised */
2246static void noinline ecb_cold
2247loop_init (EV_P_ unsigned int flags) EV_THROW
2248{
2249 if (!backend)
555 { 2250 {
2251 origflags = flags;
2252
2253#if EV_USE_REALTIME
2254 if (!have_realtime)
2255 {
2256 struct timespec ts;
2257
2258 if (!clock_gettime (CLOCK_REALTIME, &ts))
2259 have_realtime = 1;
2260 }
2261#endif
2262
556#if EV_USE_MONOTONIC 2263#if EV_USE_MONOTONIC
2264 if (!have_monotonic)
2265 {
2266 struct timespec ts;
2267
2268 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2269 have_monotonic = 1;
2270 }
2271#endif
2272
2273 /* pid check not overridable via env */
2274#ifndef _WIN32
2275 if (flags & EVFLAG_FORKCHECK)
2276 curpid = getpid ();
2277#endif
2278
2279 if (!(flags & EVFLAG_NOENV)
2280 && !enable_secure ()
2281 && getenv ("LIBEV_FLAGS"))
2282 flags = atoi (getenv ("LIBEV_FLAGS"));
2283
2284 ev_rt_now = ev_time ();
2285 mn_now = get_clock ();
2286 now_floor = mn_now;
2287 rtmn_diff = ev_rt_now - mn_now;
2288#if EV_FEATURE_API
2289 invoke_cb = ev_invoke_pending;
2290#endif
2291
2292 io_blocktime = 0.;
2293 timeout_blocktime = 0.;
2294 backend = 0;
2295 backend_fd = -1;
2296 sig_pending = 0;
2297#if EV_ASYNC_ENABLE
2298 async_pending = 0;
2299#endif
2300 pipe_write_skipped = 0;
2301 pipe_write_wanted = 0;
2302#if EV_USE_INOTIFY
2303 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2304#endif
2305#if EV_USE_SIGNALFD
2306 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2307#endif
2308
2309 if (!(flags & EVBACKEND_MASK))
2310 flags |= ev_recommended_backends ();
2311
2312#if EV_USE_IOCP
2313 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2314#endif
2315#if EV_USE_PORT
2316 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2317#endif
2318#if EV_USE_KQUEUE
2319 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2320#endif
2321#if EV_USE_EPOLL
2322 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2323#endif
2324#if EV_USE_POLL
2325 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2326#endif
2327#if EV_USE_SELECT
2328 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2329#endif
2330
2331 ev_prepare_init (&pending_w, pendingcb);
2332
2333#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2334 ev_init (&pipe_w, pipecb);
2335 ev_set_priority (&pipe_w, EV_MAXPRI);
2336#endif
2337 }
2338}
2339
2340/* free up a loop structure */
2341void ecb_cold
2342ev_loop_destroy (EV_P)
2343{
2344 int i;
2345
2346#if EV_MULTIPLICITY
2347 /* mimic free (0) */
2348 if (!EV_A)
2349 return;
2350#endif
2351
2352#if EV_CLEANUP_ENABLE
2353 /* queue cleanup watchers (and execute them) */
2354 if (expect_false (cleanupcnt))
2355 {
2356 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2357 EV_INVOKE_PENDING;
2358 }
2359#endif
2360
2361#if EV_CHILD_ENABLE
2362 if (ev_is_active (&childev))
2363 {
2364 ev_ref (EV_A); /* child watcher */
2365 ev_signal_stop (EV_A_ &childev);
2366 }
2367#endif
2368
2369 if (ev_is_active (&pipe_w))
2370 {
2371 /*ev_ref (EV_A);*/
2372 /*ev_io_stop (EV_A_ &pipe_w);*/
2373
2374#if EV_USE_EVENTFD
2375 if (evfd >= 0)
2376 close (evfd);
2377#endif
2378
2379 if (evpipe [0] >= 0)
2380 {
2381 EV_WIN32_CLOSE_FD (evpipe [0]);
2382 EV_WIN32_CLOSE_FD (evpipe [1]);
2383 }
2384 }
2385
2386#if EV_USE_SIGNALFD
2387 if (ev_is_active (&sigfd_w))
2388 close (sigfd);
2389#endif
2390
2391#if EV_USE_INOTIFY
2392 if (fs_fd >= 0)
2393 close (fs_fd);
2394#endif
2395
2396 if (backend_fd >= 0)
2397 close (backend_fd);
2398
2399#if EV_USE_IOCP
2400 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2401#endif
2402#if EV_USE_PORT
2403 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2404#endif
2405#if EV_USE_KQUEUE
2406 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2407#endif
2408#if EV_USE_EPOLL
2409 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2410#endif
2411#if EV_USE_POLL
2412 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2413#endif
2414#if EV_USE_SELECT
2415 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2416#endif
2417
2418 for (i = NUMPRI; i--; )
2419 {
2420 array_free (pending, [i]);
2421#if EV_IDLE_ENABLE
2422 array_free (idle, [i]);
2423#endif
2424 }
2425
2426 ev_free (anfds); anfds = 0; anfdmax = 0;
2427
2428 /* have to use the microsoft-never-gets-it-right macro */
2429 array_free (rfeed, EMPTY);
2430 array_free (fdchange, EMPTY);
2431 array_free (timer, EMPTY);
2432#if EV_PERIODIC_ENABLE
2433 array_free (periodic, EMPTY);
2434#endif
2435#if EV_FORK_ENABLE
2436 array_free (fork, EMPTY);
2437#endif
2438#if EV_CLEANUP_ENABLE
2439 array_free (cleanup, EMPTY);
2440#endif
2441 array_free (prepare, EMPTY);
2442 array_free (check, EMPTY);
2443#if EV_ASYNC_ENABLE
2444 array_free (async, EMPTY);
2445#endif
2446
2447 backend = 0;
2448
2449#if EV_MULTIPLICITY
2450 if (ev_is_default_loop (EV_A))
2451#endif
2452 ev_default_loop_ptr = 0;
2453#if EV_MULTIPLICITY
2454 else
2455 ev_free (EV_A);
2456#endif
2457}
2458
2459#if EV_USE_INOTIFY
2460inline_size void infy_fork (EV_P);
2461#endif
2462
2463inline_size void
2464loop_fork (EV_P)
2465{
2466#if EV_USE_PORT
2467 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2468#endif
2469#if EV_USE_KQUEUE
2470 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2471#endif
2472#if EV_USE_EPOLL
2473 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2474#endif
2475#if EV_USE_INOTIFY
2476 infy_fork (EV_A);
2477#endif
2478
2479 if (ev_is_active (&pipe_w))
2480 {
2481 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2482
2483 ev_ref (EV_A);
2484 ev_io_stop (EV_A_ &pipe_w);
2485
2486#if EV_USE_EVENTFD
2487 if (evfd >= 0)
2488 close (evfd);
2489#endif
2490
2491 if (evpipe [0] >= 0)
2492 {
2493 EV_WIN32_CLOSE_FD (evpipe [0]);
2494 EV_WIN32_CLOSE_FD (evpipe [1]);
2495 }
2496
2497#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2498 evpipe_init (EV_A);
2499 /* now iterate over everything, in case we missed something */
2500 pipecb (EV_A_ &pipe_w, EV_READ);
2501#endif
2502 }
2503
2504 postfork = 0;
2505}
2506
2507#if EV_MULTIPLICITY
2508
2509struct ev_loop * ecb_cold
2510ev_loop_new (unsigned int flags) EV_THROW
2511{
2512 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2513
2514 memset (EV_A, 0, sizeof (struct ev_loop));
2515 loop_init (EV_A_ flags);
2516
2517 if (ev_backend (EV_A))
2518 return EV_A;
2519
2520 ev_free (EV_A);
2521 return 0;
2522}
2523
2524#endif /* multiplicity */
2525
2526#if EV_VERIFY
2527static void noinline ecb_cold
2528verify_watcher (EV_P_ W w)
2529{
2530 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2531
2532 if (w->pending)
2533 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2534}
2535
2536static void noinline ecb_cold
2537verify_heap (EV_P_ ANHE *heap, int N)
2538{
2539 int i;
2540
2541 for (i = HEAP0; i < N + HEAP0; ++i)
2542 {
2543 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2544 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2545 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2546
2547 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2548 }
2549}
2550
2551static void noinline ecb_cold
2552array_verify (EV_P_ W *ws, int cnt)
2553{
2554 while (cnt--)
2555 {
2556 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2557 verify_watcher (EV_A_ ws [cnt]);
2558 }
2559}
2560#endif
2561
2562#if EV_FEATURE_API
2563void ecb_cold
2564ev_verify (EV_P) EV_THROW
2565{
2566#if EV_VERIFY
2567 int i, j;
2568 WL w, w2;
2569
2570 assert (activecnt >= -1);
2571
2572 assert (fdchangemax >= fdchangecnt);
2573 for (i = 0; i < fdchangecnt; ++i)
2574 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2575
2576 assert (anfdmax >= 0);
2577 for (i = j = 0; i < anfdmax; ++i)
2578 for (w = w2 = anfds [i].head; w; w = w->next)
557 { 2579 {
558 struct timespec ts; 2580 verify_watcher (EV_A_ (W)w);
559 if (!clock_gettime (CLOCK_MONOTONIC, &ts)) 2581
560 have_monotonic = 1; 2582 if (++j & 1)
2583 w2 = w2->next;
2584
2585 assert (("libev: io watcher list contains a loop", w != w2));
2586 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2587 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
561 } 2588 }
2589
2590 assert (timermax >= timercnt);
2591 verify_heap (EV_A_ timers, timercnt);
2592
2593#if EV_PERIODIC_ENABLE
2594 assert (periodicmax >= periodiccnt);
2595 verify_heap (EV_A_ periodics, periodiccnt);
2596#endif
2597
2598 for (i = NUMPRI; i--; )
2599 {
2600 assert (pendingmax [i] >= pendingcnt [i]);
2601#if EV_IDLE_ENABLE
2602 assert (idleall >= 0);
2603 assert (idlemax [i] >= idlecnt [i]);
2604 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2605#endif
2606 }
2607
2608#if EV_FORK_ENABLE
2609 assert (forkmax >= forkcnt);
2610 array_verify (EV_A_ (W *)forks, forkcnt);
2611#endif
2612
2613#if EV_CLEANUP_ENABLE
2614 assert (cleanupmax >= cleanupcnt);
2615 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2616#endif
2617
2618#if EV_ASYNC_ENABLE
2619 assert (asyncmax >= asynccnt);
2620 array_verify (EV_A_ (W *)asyncs, asynccnt);
2621#endif
2622
2623#if EV_PREPARE_ENABLE
2624 assert (preparemax >= preparecnt);
2625 array_verify (EV_A_ (W *)prepares, preparecnt);
2626#endif
2627
2628#if EV_CHECK_ENABLE
2629 assert (checkmax >= checkcnt);
2630 array_verify (EV_A_ (W *)checks, checkcnt);
2631#endif
2632
2633# if 0
2634#if EV_CHILD_ENABLE
2635 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2636 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2637#endif
562#endif 2638# endif
563
564 ev_now = ev_time ();
565 now = get_clock ();
566 now_floor = now;
567 diff = ev_now - now;
568
569 if (pipe (sigpipe))
570 return 0;
571
572 if (methods == EVMETHOD_AUTO)
573 if (!enable_secure () && getenv ("LIBEV_METHODS"))
574 methods = atoi (getenv ("LIBEV_METHODS"));
575 else
576 methods = EVMETHOD_ANY;
577
578 ev_method = 0;
579#if EV_USE_KQUEUE
580 if (!ev_method && (methods & EVMETHOD_KQUEUE)) kqueue_init (methods);
581#endif 2639#endif
582#if EV_USE_EPOLL 2640}
583 if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods);
584#endif 2641#endif
585#if EV_USE_POLL
586 if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
587#endif
588#if EV_USE_SELECT
589 if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
590#endif
591 2642
592 if (ev_method) 2643#if EV_MULTIPLICITY
2644struct ev_loop * ecb_cold
2645#else
2646int
2647#endif
2648ev_default_loop (unsigned int flags) EV_THROW
2649{
2650 if (!ev_default_loop_ptr)
2651 {
2652#if EV_MULTIPLICITY
2653 EV_P = ev_default_loop_ptr = &default_loop_struct;
2654#else
2655 ev_default_loop_ptr = 1;
2656#endif
2657
2658 loop_init (EV_A_ flags);
2659
2660 if (ev_backend (EV_A))
593 { 2661 {
594 ev_watcher_init (&sigev, sigcb); 2662#if EV_CHILD_ENABLE
595 ev_set_priority (&sigev, EV_MAXPRI);
596 siginit ();
597
598#ifndef WIN32
599 ev_signal_init (&childev, childcb, SIGCHLD); 2663 ev_signal_init (&childev, childcb, SIGCHLD);
600 ev_set_priority (&childev, EV_MAXPRI); 2664 ev_set_priority (&childev, EV_MAXPRI);
601 ev_signal_start (&childev); 2665 ev_signal_start (EV_A_ &childev);
2666 ev_unref (EV_A); /* child watcher should not keep loop alive */
602#endif 2667#endif
603 } 2668 }
2669 else
2670 ev_default_loop_ptr = 0;
604 } 2671 }
605 2672
606 return ev_method; 2673 return ev_default_loop_ptr;
2674}
2675
2676void
2677ev_loop_fork (EV_P) EV_THROW
2678{
2679 postfork = 1; /* must be in line with ev_default_fork */
607} 2680}
608 2681
609/*****************************************************************************/ 2682/*****************************************************************************/
610 2683
611void 2684void
612ev_fork_prepare (void) 2685ev_invoke (EV_P_ void *w, int revents)
613{ 2686{
614 /* nop */ 2687 EV_CB_INVOKE ((W)w, revents);
2688}
2689
2690unsigned int
2691ev_pending_count (EV_P) EV_THROW
2692{
2693 int pri;
2694 unsigned int count = 0;
2695
2696 for (pri = NUMPRI; pri--; )
2697 count += pendingcnt [pri];
2698
2699 return count;
2700}
2701
2702void noinline
2703ev_invoke_pending (EV_P)
2704{
2705 for (pendingpri = NUMPRI; pendingpri--; ) /* pendingpri is modified during the loop */
2706 while (pendingcnt [pendingpri])
2707 {
2708 ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
2709
2710 p->w->pending = 0;
2711 EV_CB_INVOKE (p->w, p->events);
2712 EV_FREQUENT_CHECK;
2713 }
2714}
2715
2716#if EV_IDLE_ENABLE
2717/* make idle watchers pending. this handles the "call-idle */
2718/* only when higher priorities are idle" logic */
2719inline_size void
2720idle_reify (EV_P)
2721{
2722 if (expect_false (idleall))
2723 {
2724 int pri;
2725
2726 for (pri = NUMPRI; pri--; )
2727 {
2728 if (pendingcnt [pri])
2729 break;
2730
2731 if (idlecnt [pri])
2732 {
2733 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2734 break;
2735 }
2736 }
2737 }
2738}
2739#endif
2740
2741/* make timers pending */
2742inline_size void
2743timers_reify (EV_P)
2744{
2745 EV_FREQUENT_CHECK;
2746
2747 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2748 {
2749 do
2750 {
2751 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2752
2753 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2754
2755 /* first reschedule or stop timer */
2756 if (w->repeat)
2757 {
2758 ev_at (w) += w->repeat;
2759 if (ev_at (w) < mn_now)
2760 ev_at (w) = mn_now;
2761
2762 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2763
2764 ANHE_at_cache (timers [HEAP0]);
2765 downheap (timers, timercnt, HEAP0);
2766 }
2767 else
2768 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2769
2770 EV_FREQUENT_CHECK;
2771 feed_reverse (EV_A_ (W)w);
2772 }
2773 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2774
2775 feed_reverse_done (EV_A_ EV_TIMER);
2776 }
2777}
2778
2779#if EV_PERIODIC_ENABLE
2780
2781static void noinline
2782periodic_recalc (EV_P_ ev_periodic *w)
2783{
2784 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2785 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2786
2787 /* the above almost always errs on the low side */
2788 while (at <= ev_rt_now)
2789 {
2790 ev_tstamp nat = at + w->interval;
2791
2792 /* when resolution fails us, we use ev_rt_now */
2793 if (expect_false (nat == at))
2794 {
2795 at = ev_rt_now;
2796 break;
2797 }
2798
2799 at = nat;
2800 }
2801
2802 ev_at (w) = at;
2803}
2804
2805/* make periodics pending */
2806inline_size void
2807periodics_reify (EV_P)
2808{
2809 EV_FREQUENT_CHECK;
2810
2811 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2812 {
2813 int feed_count = 0;
2814
2815 do
2816 {
2817 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2818
2819 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2820
2821 /* first reschedule or stop timer */
2822 if (w->reschedule_cb)
2823 {
2824 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2825
2826 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2827
2828 ANHE_at_cache (periodics [HEAP0]);
2829 downheap (periodics, periodiccnt, HEAP0);
2830 }
2831 else if (w->interval)
2832 {
2833 periodic_recalc (EV_A_ w);
2834 ANHE_at_cache (periodics [HEAP0]);
2835 downheap (periodics, periodiccnt, HEAP0);
2836 }
2837 else
2838 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2839
2840 EV_FREQUENT_CHECK;
2841 feed_reverse (EV_A_ (W)w);
2842 }
2843 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2844
2845 feed_reverse_done (EV_A_ EV_PERIODIC);
2846 }
2847}
2848
2849/* simply recalculate all periodics */
2850/* TODO: maybe ensure that at least one event happens when jumping forward? */
2851static void noinline ecb_cold
2852periodics_reschedule (EV_P)
2853{
2854 int i;
2855
2856 /* adjust periodics after time jump */
2857 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2858 {
2859 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2860
2861 if (w->reschedule_cb)
2862 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2863 else if (w->interval)
2864 periodic_recalc (EV_A_ w);
2865
2866 ANHE_at_cache (periodics [i]);
2867 }
2868
2869 reheap (periodics, periodiccnt);
2870}
2871#endif
2872
2873/* adjust all timers by a given offset */
2874static void noinline ecb_cold
2875timers_reschedule (EV_P_ ev_tstamp adjust)
2876{
2877 int i;
2878
2879 for (i = 0; i < timercnt; ++i)
2880 {
2881 ANHE *he = timers + i + HEAP0;
2882 ANHE_w (*he)->at += adjust;
2883 ANHE_at_cache (*he);
2884 }
2885}
2886
2887/* fetch new monotonic and realtime times from the kernel */
2888/* also detect if there was a timejump, and act accordingly */
2889inline_speed void
2890time_update (EV_P_ ev_tstamp max_block)
2891{
2892#if EV_USE_MONOTONIC
2893 if (expect_true (have_monotonic))
2894 {
2895 int i;
2896 ev_tstamp odiff = rtmn_diff;
2897
2898 mn_now = get_clock ();
2899
2900 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2901 /* interpolate in the meantime */
2902 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2903 {
2904 ev_rt_now = rtmn_diff + mn_now;
2905 return;
2906 }
2907
2908 now_floor = mn_now;
2909 ev_rt_now = ev_time ();
2910
2911 /* loop a few times, before making important decisions.
2912 * on the choice of "4": one iteration isn't enough,
2913 * in case we get preempted during the calls to
2914 * ev_time and get_clock. a second call is almost guaranteed
2915 * to succeed in that case, though. and looping a few more times
2916 * doesn't hurt either as we only do this on time-jumps or
2917 * in the unlikely event of having been preempted here.
2918 */
2919 for (i = 4; --i; )
2920 {
2921 ev_tstamp diff;
2922 rtmn_diff = ev_rt_now - mn_now;
2923
2924 diff = odiff - rtmn_diff;
2925
2926 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2927 return; /* all is well */
2928
2929 ev_rt_now = ev_time ();
2930 mn_now = get_clock ();
2931 now_floor = mn_now;
2932 }
2933
2934 /* no timer adjustment, as the monotonic clock doesn't jump */
2935 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2936# if EV_PERIODIC_ENABLE
2937 periodics_reschedule (EV_A);
2938# endif
2939 }
2940 else
2941#endif
2942 {
2943 ev_rt_now = ev_time ();
2944
2945 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2946 {
2947 /* adjust timers. this is easy, as the offset is the same for all of them */
2948 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2949#if EV_PERIODIC_ENABLE
2950 periodics_reschedule (EV_A);
2951#endif
2952 }
2953
2954 mn_now = ev_rt_now;
2955 }
2956}
2957
2958int
2959ev_run (EV_P_ int flags)
2960{
2961#if EV_FEATURE_API
2962 ++loop_depth;
2963#endif
2964
2965 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2966
2967 loop_done = EVBREAK_CANCEL;
2968
2969 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2970
2971 do
2972 {
2973#if EV_VERIFY >= 2
2974 ev_verify (EV_A);
2975#endif
2976
2977#ifndef _WIN32
2978 if (expect_false (curpid)) /* penalise the forking check even more */
2979 if (expect_false (getpid () != curpid))
2980 {
2981 curpid = getpid ();
2982 postfork = 1;
2983 }
2984#endif
2985
2986#if EV_FORK_ENABLE
2987 /* we might have forked, so queue fork handlers */
2988 if (expect_false (postfork))
2989 if (forkcnt)
2990 {
2991 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2992 EV_INVOKE_PENDING;
2993 }
2994#endif
2995
2996#if EV_PREPARE_ENABLE
2997 /* queue prepare watchers (and execute them) */
2998 if (expect_false (preparecnt))
2999 {
3000 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
3001 EV_INVOKE_PENDING;
3002 }
3003#endif
3004
3005 if (expect_false (loop_done))
3006 break;
3007
3008 /* we might have forked, so reify kernel state if necessary */
3009 if (expect_false (postfork))
3010 loop_fork (EV_A);
3011
3012 /* update fd-related kernel structures */
3013 fd_reify (EV_A);
3014
3015 /* calculate blocking time */
3016 {
3017 ev_tstamp waittime = 0.;
3018 ev_tstamp sleeptime = 0.;
3019
3020 /* remember old timestamp for io_blocktime calculation */
3021 ev_tstamp prev_mn_now = mn_now;
3022
3023 /* update time to cancel out callback processing overhead */
3024 time_update (EV_A_ 1e100);
3025
3026 /* from now on, we want a pipe-wake-up */
3027 pipe_write_wanted = 1;
3028
3029 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3030
3031 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3032 {
3033 waittime = MAX_BLOCKTIME;
3034
3035 if (timercnt)
3036 {
3037 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3038 if (waittime > to) waittime = to;
3039 }
3040
3041#if EV_PERIODIC_ENABLE
3042 if (periodiccnt)
3043 {
3044 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3045 if (waittime > to) waittime = to;
3046 }
3047#endif
3048
3049 /* don't let timeouts decrease the waittime below timeout_blocktime */
3050 if (expect_false (waittime < timeout_blocktime))
3051 waittime = timeout_blocktime;
3052
3053 /* at this point, we NEED to wait, so we have to ensure */
3054 /* to pass a minimum nonzero value to the backend */
3055 if (expect_false (waittime < backend_mintime))
3056 waittime = backend_mintime;
3057
3058 /* extra check because io_blocktime is commonly 0 */
3059 if (expect_false (io_blocktime))
3060 {
3061 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3062
3063 if (sleeptime > waittime - backend_mintime)
3064 sleeptime = waittime - backend_mintime;
3065
3066 if (expect_true (sleeptime > 0.))
3067 {
3068 ev_sleep (sleeptime);
3069 waittime -= sleeptime;
3070 }
3071 }
3072 }
3073
3074#if EV_FEATURE_API
3075 ++loop_count;
3076#endif
3077 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3078 backend_poll (EV_A_ waittime);
3079 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3080
3081 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3082
3083 if (pipe_write_skipped)
3084 {
3085 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3086 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3087 }
3088
3089
3090 /* update ev_rt_now, do magic */
3091 time_update (EV_A_ waittime + sleeptime);
3092 }
3093
3094 /* queue pending timers and reschedule them */
3095 timers_reify (EV_A); /* relative timers called last */
3096#if EV_PERIODIC_ENABLE
3097 periodics_reify (EV_A); /* absolute timers called first */
3098#endif
3099
3100#if EV_IDLE_ENABLE
3101 /* queue idle watchers unless other events are pending */
3102 idle_reify (EV_A);
3103#endif
3104
3105#if EV_CHECK_ENABLE
3106 /* queue check watchers, to be executed first */
3107 if (expect_false (checkcnt))
3108 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3109#endif
3110
3111 EV_INVOKE_PENDING;
3112 }
3113 while (expect_true (
3114 activecnt
3115 && !loop_done
3116 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3117 ));
3118
3119 if (loop_done == EVBREAK_ONE)
3120 loop_done = EVBREAK_CANCEL;
3121
3122#if EV_FEATURE_API
3123 --loop_depth;
3124#endif
3125
3126 return activecnt;
615} 3127}
616 3128
617void 3129void
618ev_fork_parent (void) 3130ev_break (EV_P_ int how) EV_THROW
619{ 3131{
620 /* nop */ 3132 loop_done = how;
621} 3133}
622 3134
623void 3135void
624ev_fork_child (void) 3136ev_ref (EV_P) EV_THROW
625{ 3137{
626#if EV_USE_EPOLL 3138 ++activecnt;
627 if (ev_method == EVMETHOD_EPOLL) 3139}
628 epoll_postfork_child ();
629#endif
630 3140
631 ev_io_stop (&sigev); 3141void
632 close (sigpipe [0]); 3142ev_unref (EV_P) EV_THROW
633 close (sigpipe [1]); 3143{
634 pipe (sigpipe); 3144 --activecnt;
635 siginit (); 3145}
3146
3147void
3148ev_now_update (EV_P) EV_THROW
3149{
3150 time_update (EV_A_ 1e100);
3151}
3152
3153void
3154ev_suspend (EV_P) EV_THROW
3155{
3156 ev_now_update (EV_A);
3157}
3158
3159void
3160ev_resume (EV_P) EV_THROW
3161{
3162 ev_tstamp mn_prev = mn_now;
3163
3164 ev_now_update (EV_A);
3165 timers_reschedule (EV_A_ mn_now - mn_prev);
3166#if EV_PERIODIC_ENABLE
3167 /* TODO: really do this? */
3168 periodics_reschedule (EV_A);
3169#endif
636} 3170}
637 3171
638/*****************************************************************************/ 3172/*****************************************************************************/
3173/* singly-linked list management, used when the expected list length is short */
639 3174
640static void 3175inline_size void
641call_pending (void) 3176wlist_add (WL *head, WL elem)
642{ 3177{
643 int pri; 3178 elem->next = *head;
3179 *head = elem;
3180}
644 3181
645 for (pri = NUMPRI; pri--; ) 3182inline_size void
646 while (pendingcnt [pri]) 3183wlist_del (WL *head, WL elem)
3184{
3185 while (*head)
3186 {
3187 if (expect_true (*head == elem))
3188 {
3189 *head = elem->next;
3190 break;
3191 }
3192
3193 head = &(*head)->next;
3194 }
3195}
3196
3197/* internal, faster, version of ev_clear_pending */
3198inline_speed void
3199clear_pending (EV_P_ W w)
3200{
3201 if (w->pending)
3202 {
3203 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3204 w->pending = 0;
3205 }
3206}
3207
3208int
3209ev_clear_pending (EV_P_ void *w) EV_THROW
3210{
3211 W w_ = (W)w;
3212 int pending = w_->pending;
3213
3214 if (expect_true (pending))
3215 {
3216 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3217 p->w = (W)&pending_w;
3218 w_->pending = 0;
3219 return p->events;
3220 }
3221 else
3222 return 0;
3223}
3224
3225inline_size void
3226pri_adjust (EV_P_ W w)
3227{
3228 int pri = ev_priority (w);
3229 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3230 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3231 ev_set_priority (w, pri);
3232}
3233
3234inline_speed void
3235ev_start (EV_P_ W w, int active)
3236{
3237 pri_adjust (EV_A_ w);
3238 w->active = active;
3239 ev_ref (EV_A);
3240}
3241
3242inline_size void
3243ev_stop (EV_P_ W w)
3244{
3245 ev_unref (EV_A);
3246 w->active = 0;
3247}
3248
3249/*****************************************************************************/
3250
3251void noinline
3252ev_io_start (EV_P_ ev_io *w) EV_THROW
3253{
3254 int fd = w->fd;
3255
3256 if (expect_false (ev_is_active (w)))
3257 return;
3258
3259 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3260 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3261
3262 EV_FREQUENT_CHECK;
3263
3264 ev_start (EV_A_ (W)w, 1);
3265 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3266 wlist_add (&anfds[fd].head, (WL)w);
3267
3268 /* common bug, apparently */
3269 assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
3270
3271 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3272 w->events &= ~EV__IOFDSET;
3273
3274 EV_FREQUENT_CHECK;
3275}
3276
3277void noinline
3278ev_io_stop (EV_P_ ev_io *w) EV_THROW
3279{
3280 clear_pending (EV_A_ (W)w);
3281 if (expect_false (!ev_is_active (w)))
3282 return;
3283
3284 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3285
3286 EV_FREQUENT_CHECK;
3287
3288 wlist_del (&anfds[w->fd].head, (WL)w);
3289 ev_stop (EV_A_ (W)w);
3290
3291 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3292
3293 EV_FREQUENT_CHECK;
3294}
3295
3296void noinline
3297ev_timer_start (EV_P_ ev_timer *w) EV_THROW
3298{
3299 if (expect_false (ev_is_active (w)))
3300 return;
3301
3302 ev_at (w) += mn_now;
3303
3304 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3305
3306 EV_FREQUENT_CHECK;
3307
3308 ++timercnt;
3309 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3310 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3311 ANHE_w (timers [ev_active (w)]) = (WT)w;
3312 ANHE_at_cache (timers [ev_active (w)]);
3313 upheap (timers, ev_active (w));
3314
3315 EV_FREQUENT_CHECK;
3316
3317 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3318}
3319
3320void noinline
3321ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
3322{
3323 clear_pending (EV_A_ (W)w);
3324 if (expect_false (!ev_is_active (w)))
3325 return;
3326
3327 EV_FREQUENT_CHECK;
3328
3329 {
3330 int active = ev_active (w);
3331
3332 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3333
3334 --timercnt;
3335
3336 if (expect_true (active < timercnt + HEAP0))
647 { 3337 {
648 ANPENDING *p = pendings [pri] + --pendingcnt [pri]; 3338 timers [active] = timers [timercnt + HEAP0];
649 3339 adjustheap (timers, timercnt, active);
650 if (p->w)
651 {
652 p->w->pending = 0;
653 p->w->cb (p->w, p->events);
654 }
655 } 3340 }
656} 3341 }
657 3342
658static void 3343 ev_at (w) -= mn_now;
659timers_reify (void)
660{
661 while (timercnt && timers [0]->at <= now)
662 {
663 struct ev_timer *w = timers [0];
664 3344
665 /* first reschedule or stop timer */ 3345 ev_stop (EV_A_ (W)w);
3346
3347 EV_FREQUENT_CHECK;
3348}
3349
3350void noinline
3351ev_timer_again (EV_P_ ev_timer *w) EV_THROW
3352{
3353 EV_FREQUENT_CHECK;
3354
3355 clear_pending (EV_A_ (W)w);
3356
3357 if (ev_is_active (w))
3358 {
666 if (w->repeat) 3359 if (w->repeat)
667 { 3360 {
668 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
669 w->at = now + w->repeat; 3361 ev_at (w) = mn_now + w->repeat;
670 downheap ((WT *)timers, timercnt, 0); 3362 ANHE_at_cache (timers [ev_active (w)]);
3363 adjustheap (timers, timercnt, ev_active (w));
671 } 3364 }
672 else 3365 else
673 ev_timer_stop (w); /* nonrepeating: stop timer */ 3366 ev_timer_stop (EV_A_ w);
674
675 event ((W)w, EV_TIMEOUT);
676 }
677}
678
679static void
680periodics_reify (void)
681{
682 while (periodiccnt && periodics [0]->at <= ev_now)
683 { 3367 }
684 struct ev_periodic *w = periodics [0]; 3368 else if (w->repeat)
3369 {
3370 ev_at (w) = w->repeat;
3371 ev_timer_start (EV_A_ w);
3372 }
685 3373
686 /* first reschedule or stop timer */ 3374 EV_FREQUENT_CHECK;
3375}
3376
3377ev_tstamp
3378ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
3379{
3380 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3381}
3382
3383#if EV_PERIODIC_ENABLE
3384void noinline
3385ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
3386{
3387 if (expect_false (ev_is_active (w)))
3388 return;
3389
3390 if (w->reschedule_cb)
3391 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
687 if (w->interval) 3392 else if (w->interval)
3393 {
3394 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3395 periodic_recalc (EV_A_ w);
3396 }
3397 else
3398 ev_at (w) = w->offset;
3399
3400 EV_FREQUENT_CHECK;
3401
3402 ++periodiccnt;
3403 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3404 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3405 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3406 ANHE_at_cache (periodics [ev_active (w)]);
3407 upheap (periodics, ev_active (w));
3408
3409 EV_FREQUENT_CHECK;
3410
3411 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3412}
3413
3414void noinline
3415ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
3416{
3417 clear_pending (EV_A_ (W)w);
3418 if (expect_false (!ev_is_active (w)))
3419 return;
3420
3421 EV_FREQUENT_CHECK;
3422
3423 {
3424 int active = ev_active (w);
3425
3426 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3427
3428 --periodiccnt;
3429
3430 if (expect_true (active < periodiccnt + HEAP0))
3431 {
3432 periodics [active] = periodics [periodiccnt + HEAP0];
3433 adjustheap (periodics, periodiccnt, active);
3434 }
3435 }
3436
3437 ev_stop (EV_A_ (W)w);
3438
3439 EV_FREQUENT_CHECK;
3440}
3441
3442void noinline
3443ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
3444{
3445 /* TODO: use adjustheap and recalculation */
3446 ev_periodic_stop (EV_A_ w);
3447 ev_periodic_start (EV_A_ w);
3448}
3449#endif
3450
3451#ifndef SA_RESTART
3452# define SA_RESTART 0
3453#endif
3454
3455#if EV_SIGNAL_ENABLE
3456
3457void noinline
3458ev_signal_start (EV_P_ ev_signal *w) EV_THROW
3459{
3460 if (expect_false (ev_is_active (w)))
3461 return;
3462
3463 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3464
3465#if EV_MULTIPLICITY
3466 assert (("libev: a signal must not be attached to two different loops",
3467 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3468
3469 signals [w->signum - 1].loop = EV_A;
3470#endif
3471
3472 EV_FREQUENT_CHECK;
3473
3474#if EV_USE_SIGNALFD
3475 if (sigfd == -2)
3476 {
3477 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3478 if (sigfd < 0 && errno == EINVAL)
3479 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3480
3481 if (sigfd >= 0)
688 { 3482 {
689 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 3483 fd_intern (sigfd); /* doing it twice will not hurt */
690 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now)); 3484
691 downheap ((WT *)periodics, periodiccnt, 0); 3485 sigemptyset (&sigfd_set);
3486
3487 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3488 ev_set_priority (&sigfd_w, EV_MAXPRI);
3489 ev_io_start (EV_A_ &sigfd_w);
3490 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3491 }
3492 }
3493
3494 if (sigfd >= 0)
3495 {
3496 /* TODO: check .head */
3497 sigaddset (&sigfd_set, w->signum);
3498 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3499
3500 signalfd (sigfd, &sigfd_set, 0);
3501 }
3502#endif
3503
3504 ev_start (EV_A_ (W)w, 1);
3505 wlist_add (&signals [w->signum - 1].head, (WL)w);
3506
3507 if (!((WL)w)->next)
3508# if EV_USE_SIGNALFD
3509 if (sigfd < 0) /*TODO*/
3510# endif
3511 {
3512# ifdef _WIN32
3513 evpipe_init (EV_A);
3514
3515 signal (w->signum, ev_sighandler);
3516# else
3517 struct sigaction sa;
3518
3519 evpipe_init (EV_A);
3520
3521 sa.sa_handler = ev_sighandler;
3522 sigfillset (&sa.sa_mask);
3523 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3524 sigaction (w->signum, &sa, 0);
3525
3526 if (origflags & EVFLAG_NOSIGMASK)
3527 {
3528 sigemptyset (&sa.sa_mask);
3529 sigaddset (&sa.sa_mask, w->signum);
3530 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3531 }
3532#endif
3533 }
3534
3535 EV_FREQUENT_CHECK;
3536}
3537
3538void noinline
3539ev_signal_stop (EV_P_ ev_signal *w) EV_THROW
3540{
3541 clear_pending (EV_A_ (W)w);
3542 if (expect_false (!ev_is_active (w)))
3543 return;
3544
3545 EV_FREQUENT_CHECK;
3546
3547 wlist_del (&signals [w->signum - 1].head, (WL)w);
3548 ev_stop (EV_A_ (W)w);
3549
3550 if (!signals [w->signum - 1].head)
3551 {
3552#if EV_MULTIPLICITY
3553 signals [w->signum - 1].loop = 0; /* unattach from signal */
3554#endif
3555#if EV_USE_SIGNALFD
3556 if (sigfd >= 0)
3557 {
3558 sigset_t ss;
3559
3560 sigemptyset (&ss);
3561 sigaddset (&ss, w->signum);
3562 sigdelset (&sigfd_set, w->signum);
3563
3564 signalfd (sigfd, &sigfd_set, 0);
3565 sigprocmask (SIG_UNBLOCK, &ss, 0);
692 } 3566 }
693 else 3567 else
694 ev_periodic_stop (w); /* nonrepeating: stop timer */ 3568#endif
695 3569 signal (w->signum, SIG_DFL);
696 event ((W)w, EV_PERIODIC);
697 }
698}
699
700static void
701periodics_reschedule (ev_tstamp diff)
702{
703 int i;
704
705 /* adjust periodics after time jump */
706 for (i = 0; i < periodiccnt; ++i)
707 { 3570 }
708 struct ev_periodic *w = periodics [i];
709 3571
710 if (w->interval) 3572 EV_FREQUENT_CHECK;
3573}
3574
3575#endif
3576
3577#if EV_CHILD_ENABLE
3578
3579void
3580ev_child_start (EV_P_ ev_child *w) EV_THROW
3581{
3582#if EV_MULTIPLICITY
3583 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3584#endif
3585 if (expect_false (ev_is_active (w)))
3586 return;
3587
3588 EV_FREQUENT_CHECK;
3589
3590 ev_start (EV_A_ (W)w, 1);
3591 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3592
3593 EV_FREQUENT_CHECK;
3594}
3595
3596void
3597ev_child_stop (EV_P_ ev_child *w) EV_THROW
3598{
3599 clear_pending (EV_A_ (W)w);
3600 if (expect_false (!ev_is_active (w)))
3601 return;
3602
3603 EV_FREQUENT_CHECK;
3604
3605 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3606 ev_stop (EV_A_ (W)w);
3607
3608 EV_FREQUENT_CHECK;
3609}
3610
3611#endif
3612
3613#if EV_STAT_ENABLE
3614
3615# ifdef _WIN32
3616# undef lstat
3617# define lstat(a,b) _stati64 (a,b)
3618# endif
3619
3620#define DEF_STAT_INTERVAL 5.0074891
3621#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3622#define MIN_STAT_INTERVAL 0.1074891
3623
3624static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3625
3626#if EV_USE_INOTIFY
3627
3628/* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3629# define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3630
3631static void noinline
3632infy_add (EV_P_ ev_stat *w)
3633{
3634 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
3635
3636 if (w->wd >= 0)
3637 {
3638 struct statfs sfs;
3639
3640 /* now local changes will be tracked by inotify, but remote changes won't */
3641 /* unless the filesystem is known to be local, we therefore still poll */
3642 /* also do poll on <2.6.25, but with normal frequency */
3643
3644 if (!fs_2625)
3645 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3646 else if (!statfs (w->path, &sfs)
3647 && (sfs.f_type == 0x1373 /* devfs */
3648 || sfs.f_type == 0xEF53 /* ext2/3 */
3649 || sfs.f_type == 0x3153464a /* jfs */
3650 || sfs.f_type == 0x52654973 /* reiser3 */
3651 || sfs.f_type == 0x01021994 /* tempfs */
3652 || sfs.f_type == 0x58465342 /* xfs */))
3653 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3654 else
3655 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3656 }
3657 else
3658 {
3659 /* can't use inotify, continue to stat */
3660 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3661
3662 /* if path is not there, monitor some parent directory for speedup hints */
3663 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3664 /* but an efficiency issue only */
3665 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
711 { 3666 {
712 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 3667 char path [4096];
3668 strcpy (path, w->path);
713 3669
714 if (fabs (diff) >= 1e-4) 3670 do
715 { 3671 {
716 ev_periodic_stop (w); 3672 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
717 ev_periodic_start (w); 3673 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
718 3674
719 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 3675 char *pend = strrchr (path, '/');
3676
3677 if (!pend || pend == path)
3678 break;
3679
3680 *pend = 0;
3681 w->wd = inotify_add_watch (fs_fd, path, mask);
3682 }
3683 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3684 }
3685 }
3686
3687 if (w->wd >= 0)
3688 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3689
3690 /* now re-arm timer, if required */
3691 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3692 ev_timer_again (EV_A_ &w->timer);
3693 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3694}
3695
3696static void noinline
3697infy_del (EV_P_ ev_stat *w)
3698{
3699 int slot;
3700 int wd = w->wd;
3701
3702 if (wd < 0)
3703 return;
3704
3705 w->wd = -2;
3706 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3707 wlist_del (&fs_hash [slot].head, (WL)w);
3708
3709 /* remove this watcher, if others are watching it, they will rearm */
3710 inotify_rm_watch (fs_fd, wd);
3711}
3712
3713static void noinline
3714infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3715{
3716 if (slot < 0)
3717 /* overflow, need to check for all hash slots */
3718 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3719 infy_wd (EV_A_ slot, wd, ev);
3720 else
3721 {
3722 WL w_;
3723
3724 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3725 {
3726 ev_stat *w = (ev_stat *)w_;
3727 w_ = w_->next; /* lets us remove this watcher and all before it */
3728
3729 if (w->wd == wd || wd == -1)
3730 {
3731 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3732 {
3733 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3734 w->wd = -1;
3735 infy_add (EV_A_ w); /* re-add, no matter what */
3736 }
3737
3738 stat_timer_cb (EV_A_ &w->timer, 0);
720 } 3739 }
721 } 3740 }
722 } 3741 }
723} 3742}
724 3743
725static int 3744static void
726time_update_monotonic (void) 3745infy_cb (EV_P_ ev_io *w, int revents)
727{ 3746{
728 now = get_clock (); 3747 char buf [EV_INOTIFY_BUFSIZE];
3748 int ofs;
3749 int len = read (fs_fd, buf, sizeof (buf));
729 3750
730 if (expect_true (now - now_floor < MIN_TIMEJUMP * .5)) 3751 for (ofs = 0; ofs < len; )
3752 {
3753 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3754 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3755 ofs += sizeof (struct inotify_event) + ev->len;
731 { 3756 }
732 ev_now = now + diff; 3757}
3758
3759inline_size void ecb_cold
3760ev_check_2625 (EV_P)
3761{
3762 /* kernels < 2.6.25 are borked
3763 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3764 */
3765 if (ev_linux_version () < 0x020619)
733 return 0; 3766 return;
3767
3768 fs_2625 = 1;
3769}
3770
3771inline_size int
3772infy_newfd (void)
3773{
3774#if defined IN_CLOEXEC && defined IN_NONBLOCK
3775 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3776 if (fd >= 0)
3777 return fd;
3778#endif
3779 return inotify_init ();
3780}
3781
3782inline_size void
3783infy_init (EV_P)
3784{
3785 if (fs_fd != -2)
3786 return;
3787
3788 fs_fd = -1;
3789
3790 ev_check_2625 (EV_A);
3791
3792 fs_fd = infy_newfd ();
3793
3794 if (fs_fd >= 0)
734 } 3795 {
3796 fd_intern (fs_fd);
3797 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3798 ev_set_priority (&fs_w, EV_MAXPRI);
3799 ev_io_start (EV_A_ &fs_w);
3800 ev_unref (EV_A);
3801 }
3802}
3803
3804inline_size void
3805infy_fork (EV_P)
3806{
3807 int slot;
3808
3809 if (fs_fd < 0)
3810 return;
3811
3812 ev_ref (EV_A);
3813 ev_io_stop (EV_A_ &fs_w);
3814 close (fs_fd);
3815 fs_fd = infy_newfd ();
3816
3817 if (fs_fd >= 0)
3818 {
3819 fd_intern (fs_fd);
3820 ev_io_set (&fs_w, fs_fd, EV_READ);
3821 ev_io_start (EV_A_ &fs_w);
3822 ev_unref (EV_A);
3823 }
3824
3825 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3826 {
3827 WL w_ = fs_hash [slot].head;
3828 fs_hash [slot].head = 0;
3829
3830 while (w_)
3831 {
3832 ev_stat *w = (ev_stat *)w_;
3833 w_ = w_->next; /* lets us add this watcher */
3834
3835 w->wd = -1;
3836
3837 if (fs_fd >= 0)
3838 infy_add (EV_A_ w); /* re-add, no matter what */
3839 else
3840 {
3841 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3842 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3843 ev_timer_again (EV_A_ &w->timer);
3844 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3845 }
3846 }
3847 }
3848}
3849
3850#endif
3851
3852#ifdef _WIN32
3853# define EV_LSTAT(p,b) _stati64 (p, b)
3854#else
3855# define EV_LSTAT(p,b) lstat (p, b)
3856#endif
3857
3858void
3859ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
3860{
3861 if (lstat (w->path, &w->attr) < 0)
3862 w->attr.st_nlink = 0;
3863 else if (!w->attr.st_nlink)
3864 w->attr.st_nlink = 1;
3865}
3866
3867static void noinline
3868stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3869{
3870 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3871
3872 ev_statdata prev = w->attr;
3873 ev_stat_stat (EV_A_ w);
3874
3875 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3876 if (
3877 prev.st_dev != w->attr.st_dev
3878 || prev.st_ino != w->attr.st_ino
3879 || prev.st_mode != w->attr.st_mode
3880 || prev.st_nlink != w->attr.st_nlink
3881 || prev.st_uid != w->attr.st_uid
3882 || prev.st_gid != w->attr.st_gid
3883 || prev.st_rdev != w->attr.st_rdev
3884 || prev.st_size != w->attr.st_size
3885 || prev.st_atime != w->attr.st_atime
3886 || prev.st_mtime != w->attr.st_mtime
3887 || prev.st_ctime != w->attr.st_ctime
3888 ) {
3889 /* we only update w->prev on actual differences */
3890 /* in case we test more often than invoke the callback, */
3891 /* to ensure that prev is always different to attr */
3892 w->prev = prev;
3893
3894 #if EV_USE_INOTIFY
3895 if (fs_fd >= 0)
3896 {
3897 infy_del (EV_A_ w);
3898 infy_add (EV_A_ w);
3899 ev_stat_stat (EV_A_ w); /* avoid race... */
3900 }
3901 #endif
3902
3903 ev_feed_event (EV_A_ w, EV_STAT);
3904 }
3905}
3906
3907void
3908ev_stat_start (EV_P_ ev_stat *w) EV_THROW
3909{
3910 if (expect_false (ev_is_active (w)))
3911 return;
3912
3913 ev_stat_stat (EV_A_ w);
3914
3915 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3916 w->interval = MIN_STAT_INTERVAL;
3917
3918 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3919 ev_set_priority (&w->timer, ev_priority (w));
3920
3921#if EV_USE_INOTIFY
3922 infy_init (EV_A);
3923
3924 if (fs_fd >= 0)
3925 infy_add (EV_A_ w);
735 else 3926 else
3927#endif
3928 {
3929 ev_timer_again (EV_A_ &w->timer);
3930 ev_unref (EV_A);
736 { 3931 }
737 now_floor = now; 3932
738 ev_now = ev_time (); 3933 ev_start (EV_A_ (W)w, 1);
3934
3935 EV_FREQUENT_CHECK;
3936}
3937
3938void
3939ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
3940{
3941 clear_pending (EV_A_ (W)w);
3942 if (expect_false (!ev_is_active (w)))
739 return 1; 3943 return;
3944
3945 EV_FREQUENT_CHECK;
3946
3947#if EV_USE_INOTIFY
3948 infy_del (EV_A_ w);
3949#endif
3950
3951 if (ev_is_active (&w->timer))
740 } 3952 {
3953 ev_ref (EV_A);
3954 ev_timer_stop (EV_A_ &w->timer);
3955 }
3956
3957 ev_stop (EV_A_ (W)w);
3958
3959 EV_FREQUENT_CHECK;
3960}
3961#endif
3962
3963#if EV_IDLE_ENABLE
3964void
3965ev_idle_start (EV_P_ ev_idle *w) EV_THROW
3966{
3967 if (expect_false (ev_is_active (w)))
3968 return;
3969
3970 pri_adjust (EV_A_ (W)w);
3971
3972 EV_FREQUENT_CHECK;
3973
3974 {
3975 int active = ++idlecnt [ABSPRI (w)];
3976
3977 ++idleall;
3978 ev_start (EV_A_ (W)w, active);
3979
3980 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3981 idles [ABSPRI (w)][active - 1] = w;
3982 }
3983
3984 EV_FREQUENT_CHECK;
3985}
3986
3987void
3988ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
3989{
3990 clear_pending (EV_A_ (W)w);
3991 if (expect_false (!ev_is_active (w)))
3992 return;
3993
3994 EV_FREQUENT_CHECK;
3995
3996 {
3997 int active = ev_active (w);
3998
3999 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
4000 ev_active (idles [ABSPRI (w)][active - 1]) = active;
4001
4002 ev_stop (EV_A_ (W)w);
4003 --idleall;
4004 }
4005
4006 EV_FREQUENT_CHECK;
4007}
4008#endif
4009
4010#if EV_PREPARE_ENABLE
4011void
4012ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
4013{
4014 if (expect_false (ev_is_active (w)))
4015 return;
4016
4017 EV_FREQUENT_CHECK;
4018
4019 ev_start (EV_A_ (W)w, ++preparecnt);
4020 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
4021 prepares [preparecnt - 1] = w;
4022
4023 EV_FREQUENT_CHECK;
4024}
4025
4026void
4027ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
4028{
4029 clear_pending (EV_A_ (W)w);
4030 if (expect_false (!ev_is_active (w)))
4031 return;
4032
4033 EV_FREQUENT_CHECK;
4034
4035 {
4036 int active = ev_active (w);
4037
4038 prepares [active - 1] = prepares [--preparecnt];
4039 ev_active (prepares [active - 1]) = active;
4040 }
4041
4042 ev_stop (EV_A_ (W)w);
4043
4044 EV_FREQUENT_CHECK;
4045}
4046#endif
4047
4048#if EV_CHECK_ENABLE
4049void
4050ev_check_start (EV_P_ ev_check *w) EV_THROW
4051{
4052 if (expect_false (ev_is_active (w)))
4053 return;
4054
4055 EV_FREQUENT_CHECK;
4056
4057 ev_start (EV_A_ (W)w, ++checkcnt);
4058 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4059 checks [checkcnt - 1] = w;
4060
4061 EV_FREQUENT_CHECK;
4062}
4063
4064void
4065ev_check_stop (EV_P_ ev_check *w) EV_THROW
4066{
4067 clear_pending (EV_A_ (W)w);
4068 if (expect_false (!ev_is_active (w)))
4069 return;
4070
4071 EV_FREQUENT_CHECK;
4072
4073 {
4074 int active = ev_active (w);
4075
4076 checks [active - 1] = checks [--checkcnt];
4077 ev_active (checks [active - 1]) = active;
4078 }
4079
4080 ev_stop (EV_A_ (W)w);
4081
4082 EV_FREQUENT_CHECK;
4083}
4084#endif
4085
4086#if EV_EMBED_ENABLE
4087void noinline
4088ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
4089{
4090 ev_run (w->other, EVRUN_NOWAIT);
741} 4091}
742 4092
743static void 4093static void
744time_update (void) 4094embed_io_cb (EV_P_ ev_io *io, int revents)
745{ 4095{
746 int i; 4096 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
747 4097
748#if EV_USE_MONOTONIC 4098 if (ev_cb (w))
749 if (expect_true (have_monotonic)) 4099 ev_feed_event (EV_A_ (W)w, EV_EMBED);
750 {
751 if (time_update_monotonic ())
752 {
753 ev_tstamp odiff = diff;
754
755 for (i = 4; --i; ) /* loop a few times, before making important decisions */
756 {
757 diff = ev_now - now;
758
759 if (fabs (odiff - diff) < MIN_TIMEJUMP)
760 return; /* all is well */
761
762 ev_now = ev_time ();
763 now = get_clock ();
764 now_floor = now;
765 }
766
767 periodics_reschedule (diff - odiff);
768 /* no timer adjustment, as the monotonic clock doesn't jump */
769 }
770 }
771 else 4100 else
772#endif 4101 ev_run (w->other, EVRUN_NOWAIT);
4102}
4103
4104static void
4105embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4106{
4107 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4108
773 { 4109 {
774 ev_now = ev_time (); 4110 EV_P = w->other;
775 4111
776 if (expect_false (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)) 4112 while (fdchangecnt)
777 { 4113 {
778 periodics_reschedule (ev_now - now); 4114 fd_reify (EV_A);
779 4115 ev_run (EV_A_ EVRUN_NOWAIT);
780 /* adjust timers. this is easy, as the offset is the same for all */
781 for (i = 0; i < timercnt; ++i)
782 timers [i]->at += diff;
783 } 4116 }
784
785 now = ev_now;
786 } 4117 }
787} 4118}
788 4119
789int ev_loop_done; 4120static void
790 4121embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
791void ev_loop (int flags)
792{ 4122{
793 double block; 4123 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
794 ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
795 4124
796 do 4125 ev_embed_stop (EV_A_ w);
4126
797 { 4127 {
798 /* queue check watchers (and execute them) */ 4128 EV_P = w->other;
799 if (expect_false (preparecnt))
800 {
801 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
802 call_pending ();
803 }
804 4129
805 /* update fd-related kernel structures */ 4130 ev_loop_fork (EV_A);
806 fd_reify (); 4131 ev_run (EV_A_ EVRUN_NOWAIT);
807
808 /* calculate blocking time */
809
810 /* we only need this for !monotonic clockor timers, but as we basically
811 always have timers, we just calculate it always */
812#if EV_USE_MONOTONIC
813 if (expect_true (have_monotonic))
814 time_update_monotonic ();
815 else
816#endif
817 {
818 ev_now = ev_time ();
819 now = ev_now;
820 }
821
822 if (flags & EVLOOP_NONBLOCK || idlecnt)
823 block = 0.;
824 else
825 {
826 block = MAX_BLOCKTIME;
827
828 if (timercnt)
829 {
830 ev_tstamp to = timers [0]->at - now + method_fudge;
831 if (block > to) block = to;
832 }
833
834 if (periodiccnt)
835 {
836 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
837 if (block > to) block = to;
838 }
839
840 if (block < 0.) block = 0.;
841 }
842
843 method_poll (block);
844
845 /* update ev_now, do magic */
846 time_update ();
847
848 /* queue pending timers and reschedule them */
849 timers_reify (); /* relative timers called last */
850 periodics_reify (); /* absolute timers called first */
851
852 /* queue idle watchers unless io or timers are pending */
853 if (!pendingcnt)
854 queue_events ((W *)idles, idlecnt, EV_IDLE);
855
856 /* queue check watchers, to be executed first */
857 if (checkcnt)
858 queue_events ((W *)checks, checkcnt, EV_CHECK);
859
860 call_pending ();
861 } 4132 }
862 while (!ev_loop_done);
863 4133
864 if (ev_loop_done != 2) 4134 ev_embed_start (EV_A_ w);
865 ev_loop_done = 0;
866} 4135}
4136
4137#if 0
4138static void
4139embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4140{
4141 ev_idle_stop (EV_A_ idle);
4142}
4143#endif
4144
4145void
4146ev_embed_start (EV_P_ ev_embed *w) EV_THROW
4147{
4148 if (expect_false (ev_is_active (w)))
4149 return;
4150
4151 {
4152 EV_P = w->other;
4153 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4154 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4155 }
4156
4157 EV_FREQUENT_CHECK;
4158
4159 ev_set_priority (&w->io, ev_priority (w));
4160 ev_io_start (EV_A_ &w->io);
4161
4162 ev_prepare_init (&w->prepare, embed_prepare_cb);
4163 ev_set_priority (&w->prepare, EV_MINPRI);
4164 ev_prepare_start (EV_A_ &w->prepare);
4165
4166 ev_fork_init (&w->fork, embed_fork_cb);
4167 ev_fork_start (EV_A_ &w->fork);
4168
4169 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4170
4171 ev_start (EV_A_ (W)w, 1);
4172
4173 EV_FREQUENT_CHECK;
4174}
4175
4176void
4177ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
4178{
4179 clear_pending (EV_A_ (W)w);
4180 if (expect_false (!ev_is_active (w)))
4181 return;
4182
4183 EV_FREQUENT_CHECK;
4184
4185 ev_io_stop (EV_A_ &w->io);
4186 ev_prepare_stop (EV_A_ &w->prepare);
4187 ev_fork_stop (EV_A_ &w->fork);
4188
4189 ev_stop (EV_A_ (W)w);
4190
4191 EV_FREQUENT_CHECK;
4192}
4193#endif
4194
4195#if EV_FORK_ENABLE
4196void
4197ev_fork_start (EV_P_ ev_fork *w) EV_THROW
4198{
4199 if (expect_false (ev_is_active (w)))
4200 return;
4201
4202 EV_FREQUENT_CHECK;
4203
4204 ev_start (EV_A_ (W)w, ++forkcnt);
4205 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4206 forks [forkcnt - 1] = w;
4207
4208 EV_FREQUENT_CHECK;
4209}
4210
4211void
4212ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
4213{
4214 clear_pending (EV_A_ (W)w);
4215 if (expect_false (!ev_is_active (w)))
4216 return;
4217
4218 EV_FREQUENT_CHECK;
4219
4220 {
4221 int active = ev_active (w);
4222
4223 forks [active - 1] = forks [--forkcnt];
4224 ev_active (forks [active - 1]) = active;
4225 }
4226
4227 ev_stop (EV_A_ (W)w);
4228
4229 EV_FREQUENT_CHECK;
4230}
4231#endif
4232
4233#if EV_CLEANUP_ENABLE
4234void
4235ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
4236{
4237 if (expect_false (ev_is_active (w)))
4238 return;
4239
4240 EV_FREQUENT_CHECK;
4241
4242 ev_start (EV_A_ (W)w, ++cleanupcnt);
4243 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4244 cleanups [cleanupcnt - 1] = w;
4245
4246 /* cleanup watchers should never keep a refcount on the loop */
4247 ev_unref (EV_A);
4248 EV_FREQUENT_CHECK;
4249}
4250
4251void
4252ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
4253{
4254 clear_pending (EV_A_ (W)w);
4255 if (expect_false (!ev_is_active (w)))
4256 return;
4257
4258 EV_FREQUENT_CHECK;
4259 ev_ref (EV_A);
4260
4261 {
4262 int active = ev_active (w);
4263
4264 cleanups [active - 1] = cleanups [--cleanupcnt];
4265 ev_active (cleanups [active - 1]) = active;
4266 }
4267
4268 ev_stop (EV_A_ (W)w);
4269
4270 EV_FREQUENT_CHECK;
4271}
4272#endif
4273
4274#if EV_ASYNC_ENABLE
4275void
4276ev_async_start (EV_P_ ev_async *w) EV_THROW
4277{
4278 if (expect_false (ev_is_active (w)))
4279 return;
4280
4281 w->sent = 0;
4282
4283 evpipe_init (EV_A);
4284
4285 EV_FREQUENT_CHECK;
4286
4287 ev_start (EV_A_ (W)w, ++asynccnt);
4288 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4289 asyncs [asynccnt - 1] = w;
4290
4291 EV_FREQUENT_CHECK;
4292}
4293
4294void
4295ev_async_stop (EV_P_ ev_async *w) EV_THROW
4296{
4297 clear_pending (EV_A_ (W)w);
4298 if (expect_false (!ev_is_active (w)))
4299 return;
4300
4301 EV_FREQUENT_CHECK;
4302
4303 {
4304 int active = ev_active (w);
4305
4306 asyncs [active - 1] = asyncs [--asynccnt];
4307 ev_active (asyncs [active - 1]) = active;
4308 }
4309
4310 ev_stop (EV_A_ (W)w);
4311
4312 EV_FREQUENT_CHECK;
4313}
4314
4315void
4316ev_async_send (EV_P_ ev_async *w) EV_THROW
4317{
4318 w->sent = 1;
4319 evpipe_write (EV_A_ &async_pending);
4320}
4321#endif
867 4322
868/*****************************************************************************/ 4323/*****************************************************************************/
869 4324
870static void
871wlist_add (WL *head, WL elem)
872{
873 elem->next = *head;
874 *head = elem;
875}
876
877static void
878wlist_del (WL *head, WL elem)
879{
880 while (*head)
881 {
882 if (*head == elem)
883 {
884 *head = elem->next;
885 return;
886 }
887
888 head = &(*head)->next;
889 }
890}
891
892static void
893ev_clear_pending (W w)
894{
895 if (w->pending)
896 {
897 pendings [ABSPRI (w)][w->pending - 1].w = 0;
898 w->pending = 0;
899 }
900}
901
902static void
903ev_start (W w, int active)
904{
905 if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
906 if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
907
908 w->active = active;
909}
910
911static void
912ev_stop (W w)
913{
914 w->active = 0;
915}
916
917/*****************************************************************************/
918
919void
920ev_io_start (struct ev_io *w)
921{
922 int fd = w->fd;
923
924 if (ev_is_active (w))
925 return;
926
927 assert (("ev_io_start called with negative fd", fd >= 0));
928
929 ev_start ((W)w, 1);
930 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
931 wlist_add ((WL *)&anfds[fd].head, (WL)w);
932
933 fd_change (fd);
934}
935
936void
937ev_io_stop (struct ev_io *w)
938{
939 ev_clear_pending ((W)w);
940 if (!ev_is_active (w))
941 return;
942
943 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
944 ev_stop ((W)w);
945
946 fd_change (w->fd);
947}
948
949void
950ev_timer_start (struct ev_timer *w)
951{
952 if (ev_is_active (w))
953 return;
954
955 w->at += now;
956
957 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
958
959 ev_start ((W)w, ++timercnt);
960 array_needsize (timers, timermax, timercnt, );
961 timers [timercnt - 1] = w;
962 upheap ((WT *)timers, timercnt - 1);
963}
964
965void
966ev_timer_stop (struct ev_timer *w)
967{
968 ev_clear_pending ((W)w);
969 if (!ev_is_active (w))
970 return;
971
972 if (w->active < timercnt--)
973 {
974 timers [w->active - 1] = timers [timercnt];
975 downheap ((WT *)timers, timercnt, w->active - 1);
976 }
977
978 w->at = w->repeat;
979
980 ev_stop ((W)w);
981}
982
983void
984ev_timer_again (struct ev_timer *w)
985{
986 if (ev_is_active (w))
987 {
988 if (w->repeat)
989 {
990 w->at = now + w->repeat;
991 downheap ((WT *)timers, timercnt, w->active - 1);
992 }
993 else
994 ev_timer_stop (w);
995 }
996 else if (w->repeat)
997 ev_timer_start (w);
998}
999
1000void
1001ev_periodic_start (struct ev_periodic *w)
1002{
1003 if (ev_is_active (w))
1004 return;
1005
1006 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1007
1008 /* this formula differs from the one in periodic_reify because we do not always round up */
1009 if (w->interval)
1010 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
1011
1012 ev_start ((W)w, ++periodiccnt);
1013 array_needsize (periodics, periodicmax, periodiccnt, );
1014 periodics [periodiccnt - 1] = w;
1015 upheap ((WT *)periodics, periodiccnt - 1);
1016}
1017
1018void
1019ev_periodic_stop (struct ev_periodic *w)
1020{
1021 ev_clear_pending ((W)w);
1022 if (!ev_is_active (w))
1023 return;
1024
1025 if (w->active < periodiccnt--)
1026 {
1027 periodics [w->active - 1] = periodics [periodiccnt];
1028 downheap ((WT *)periodics, periodiccnt, w->active - 1);
1029 }
1030
1031 ev_stop ((W)w);
1032}
1033
1034#ifndef SA_RESTART
1035# define SA_RESTART 0
1036#endif
1037
1038void
1039ev_signal_start (struct ev_signal *w)
1040{
1041 if (ev_is_active (w))
1042 return;
1043
1044 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1045
1046 ev_start ((W)w, 1);
1047 array_needsize (signals, signalmax, w->signum, signals_init);
1048 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
1049
1050 if (!w->next)
1051 {
1052 struct sigaction sa;
1053 sa.sa_handler = sighandler;
1054 sigfillset (&sa.sa_mask);
1055 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1056 sigaction (w->signum, &sa, 0);
1057 }
1058}
1059
1060void
1061ev_signal_stop (struct ev_signal *w)
1062{
1063 ev_clear_pending ((W)w);
1064 if (!ev_is_active (w))
1065 return;
1066
1067 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1068 ev_stop ((W)w);
1069
1070 if (!signals [w->signum - 1].head)
1071 signal (w->signum, SIG_DFL);
1072}
1073
1074void
1075ev_idle_start (struct ev_idle *w)
1076{
1077 if (ev_is_active (w))
1078 return;
1079
1080 ev_start ((W)w, ++idlecnt);
1081 array_needsize (idles, idlemax, idlecnt, );
1082 idles [idlecnt - 1] = w;
1083}
1084
1085void
1086ev_idle_stop (struct ev_idle *w)
1087{
1088 ev_clear_pending ((W)w);
1089 if (ev_is_active (w))
1090 return;
1091
1092 idles [w->active - 1] = idles [--idlecnt];
1093 ev_stop ((W)w);
1094}
1095
1096void
1097ev_prepare_start (struct ev_prepare *w)
1098{
1099 if (ev_is_active (w))
1100 return;
1101
1102 ev_start ((W)w, ++preparecnt);
1103 array_needsize (prepares, preparemax, preparecnt, );
1104 prepares [preparecnt - 1] = w;
1105}
1106
1107void
1108ev_prepare_stop (struct ev_prepare *w)
1109{
1110 ev_clear_pending ((W)w);
1111 if (ev_is_active (w))
1112 return;
1113
1114 prepares [w->active - 1] = prepares [--preparecnt];
1115 ev_stop ((W)w);
1116}
1117
1118void
1119ev_check_start (struct ev_check *w)
1120{
1121 if (ev_is_active (w))
1122 return;
1123
1124 ev_start ((W)w, ++checkcnt);
1125 array_needsize (checks, checkmax, checkcnt, );
1126 checks [checkcnt - 1] = w;
1127}
1128
1129void
1130ev_check_stop (struct ev_check *w)
1131{
1132 ev_clear_pending ((W)w);
1133 if (ev_is_active (w))
1134 return;
1135
1136 checks [w->active - 1] = checks [--checkcnt];
1137 ev_stop ((W)w);
1138}
1139
1140void
1141ev_child_start (struct ev_child *w)
1142{
1143 if (ev_is_active (w))
1144 return;
1145
1146 ev_start ((W)w, 1);
1147 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1148}
1149
1150void
1151ev_child_stop (struct ev_child *w)
1152{
1153 ev_clear_pending ((W)w);
1154 if (ev_is_active (w))
1155 return;
1156
1157 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1158 ev_stop ((W)w);
1159}
1160
1161/*****************************************************************************/
1162
1163struct ev_once 4325struct ev_once
1164{ 4326{
1165 struct ev_io io; 4327 ev_io io;
1166 struct ev_timer to; 4328 ev_timer to;
1167 void (*cb)(int revents, void *arg); 4329 void (*cb)(int revents, void *arg);
1168 void *arg; 4330 void *arg;
1169}; 4331};
1170 4332
1171static void 4333static void
1172once_cb (struct ev_once *once, int revents) 4334once_cb (EV_P_ struct ev_once *once, int revents)
1173{ 4335{
1174 void (*cb)(int revents, void *arg) = once->cb; 4336 void (*cb)(int revents, void *arg) = once->cb;
1175 void *arg = once->arg; 4337 void *arg = once->arg;
1176 4338
1177 ev_io_stop (&once->io); 4339 ev_io_stop (EV_A_ &once->io);
1178 ev_timer_stop (&once->to); 4340 ev_timer_stop (EV_A_ &once->to);
1179 free (once); 4341 ev_free (once);
1180 4342
1181 cb (revents, arg); 4343 cb (revents, arg);
1182} 4344}
1183 4345
1184static void 4346static void
1185once_cb_io (struct ev_io *w, int revents) 4347once_cb_io (EV_P_ ev_io *w, int revents)
1186{ 4348{
1187 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents); 4349 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4350
4351 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
1188} 4352}
1189 4353
1190static void 4354static void
1191once_cb_to (struct ev_timer *w, int revents) 4355once_cb_to (EV_P_ ev_timer *w, int revents)
1192{ 4356{
1193 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents); 4357 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4358
4359 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
1194} 4360}
1195 4361
1196void 4362void
1197ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) 4363ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
1198{ 4364{
1199 struct ev_once *once = malloc (sizeof (struct ev_once)); 4365 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
1200 4366
1201 if (!once) 4367 if (expect_false (!once))
4368 {
1202 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg); 4369 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
1203 else 4370 return;
1204 { 4371 }
4372
1205 once->cb = cb; 4373 once->cb = cb;
1206 once->arg = arg; 4374 once->arg = arg;
1207 4375
1208 ev_watcher_init (&once->io, once_cb_io); 4376 ev_init (&once->io, once_cb_io);
1209 if (fd >= 0) 4377 if (fd >= 0)
4378 {
4379 ev_io_set (&once->io, fd, events);
4380 ev_io_start (EV_A_ &once->io);
4381 }
4382
4383 ev_init (&once->to, once_cb_to);
4384 if (timeout >= 0.)
4385 {
4386 ev_timer_set (&once->to, timeout, 0.);
4387 ev_timer_start (EV_A_ &once->to);
4388 }
4389}
4390
4391/*****************************************************************************/
4392
4393#if EV_WALK_ENABLE
4394void ecb_cold
4395ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
4396{
4397 int i, j;
4398 ev_watcher_list *wl, *wn;
4399
4400 if (types & (EV_IO | EV_EMBED))
4401 for (i = 0; i < anfdmax; ++i)
4402 for (wl = anfds [i].head; wl; )
1210 { 4403 {
1211 ev_io_set (&once->io, fd, events); 4404 wn = wl->next;
1212 ev_io_start (&once->io); 4405
4406#if EV_EMBED_ENABLE
4407 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4408 {
4409 if (types & EV_EMBED)
4410 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4411 }
4412 else
4413#endif
4414#if EV_USE_INOTIFY
4415 if (ev_cb ((ev_io *)wl) == infy_cb)
4416 ;
4417 else
4418#endif
4419 if ((ev_io *)wl != &pipe_w)
4420 if (types & EV_IO)
4421 cb (EV_A_ EV_IO, wl);
4422
4423 wl = wn;
1213 } 4424 }
1214 4425
1215 ev_watcher_init (&once->to, once_cb_to); 4426 if (types & (EV_TIMER | EV_STAT))
1216 if (timeout >= 0.) 4427 for (i = timercnt + HEAP0; i-- > HEAP0; )
4428#if EV_STAT_ENABLE
4429 /*TODO: timer is not always active*/
4430 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
1217 { 4431 {
1218 ev_timer_set (&once->to, timeout, 0.); 4432 if (types & EV_STAT)
1219 ev_timer_start (&once->to); 4433 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
1220 } 4434 }
1221 } 4435 else
1222} 4436#endif
4437 if (types & EV_TIMER)
4438 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
1223 4439
1224/*****************************************************************************/ 4440#if EV_PERIODIC_ENABLE
4441 if (types & EV_PERIODIC)
4442 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4443 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4444#endif
1225 4445
1226#if 0 4446#if EV_IDLE_ENABLE
4447 if (types & EV_IDLE)
4448 for (j = NUMPRI; j--; )
4449 for (i = idlecnt [j]; i--; )
4450 cb (EV_A_ EV_IDLE, idles [j][i]);
4451#endif
1227 4452
1228struct ev_io wio; 4453#if EV_FORK_ENABLE
4454 if (types & EV_FORK)
4455 for (i = forkcnt; i--; )
4456 if (ev_cb (forks [i]) != embed_fork_cb)
4457 cb (EV_A_ EV_FORK, forks [i]);
4458#endif
1229 4459
1230static void 4460#if EV_ASYNC_ENABLE
1231sin_cb (struct ev_io *w, int revents) 4461 if (types & EV_ASYNC)
1232{ 4462 for (i = asynccnt; i--; )
1233 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); 4463 cb (EV_A_ EV_ASYNC, asyncs [i]);
1234} 4464#endif
1235 4465
1236static void 4466#if EV_PREPARE_ENABLE
1237ocb (struct ev_timer *w, int revents) 4467 if (types & EV_PREPARE)
1238{ 4468 for (i = preparecnt; i--; )
1239 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); 4469# if EV_EMBED_ENABLE
1240 ev_timer_stop (w); 4470 if (ev_cb (prepares [i]) != embed_prepare_cb)
1241 ev_timer_start (w);
1242}
1243
1244static void
1245scb (struct ev_signal *w, int revents)
1246{
1247 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
1248 ev_io_stop (&wio);
1249 ev_io_start (&wio);
1250}
1251
1252static void
1253gcb (struct ev_signal *w, int revents)
1254{
1255 fprintf (stderr, "generic %x\n", revents);
1256
1257}
1258
1259int main (void)
1260{
1261 ev_init (0);
1262
1263 ev_io_init (&wio, sin_cb, 0, EV_READ);
1264 ev_io_start (&wio);
1265
1266 struct ev_timer t[10000];
1267
1268#if 0
1269 int i;
1270 for (i = 0; i < 10000; ++i)
1271 {
1272 struct ev_timer *w = t + i;
1273 ev_watcher_init (w, ocb, i);
1274 ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
1275 ev_timer_start (w);
1276 if (drand48 () < 0.5)
1277 ev_timer_stop (w);
1278 }
1279#endif 4471# endif
1280 4472 cb (EV_A_ EV_PREPARE, prepares [i]);
1281 struct ev_timer t1;
1282 ev_timer_init (&t1, ocb, 5, 10);
1283 ev_timer_start (&t1);
1284
1285 struct ev_signal sig;
1286 ev_signal_init (&sig, scb, SIGQUIT);
1287 ev_signal_start (&sig);
1288
1289 struct ev_check cw;
1290 ev_check_init (&cw, gcb);
1291 ev_check_start (&cw);
1292
1293 struct ev_idle iw;
1294 ev_idle_init (&iw, gcb);
1295 ev_idle_start (&iw);
1296
1297 ev_loop (0);
1298
1299 return 0;
1300}
1301
1302#endif 4473#endif
1303 4474
4475#if EV_CHECK_ENABLE
4476 if (types & EV_CHECK)
4477 for (i = checkcnt; i--; )
4478 cb (EV_A_ EV_CHECK, checks [i]);
4479#endif
1304 4480
4481#if EV_SIGNAL_ENABLE
4482 if (types & EV_SIGNAL)
4483 for (i = 0; i < EV_NSIG - 1; ++i)
4484 for (wl = signals [i].head; wl; )
4485 {
4486 wn = wl->next;
4487 cb (EV_A_ EV_SIGNAL, wl);
4488 wl = wn;
4489 }
4490#endif
1305 4491
4492#if EV_CHILD_ENABLE
4493 if (types & EV_CHILD)
4494 for (i = (EV_PID_HASHSIZE); i--; )
4495 for (wl = childs [i]; wl; )
4496 {
4497 wn = wl->next;
4498 cb (EV_A_ EV_CHILD, wl);
4499 wl = wn;
4500 }
4501#endif
4502/* EV_STAT 0x00001000 /* stat data changed */
4503/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4504}
4505#endif
1306 4506
4507#if EV_MULTIPLICITY
4508 #include "ev_wrap.h"
4509#endif
4510

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