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Comparing libev/ev.c (file contents):
Revision 1.39 by root, Thu Nov 1 17:17:32 2007 UTC vs.
Revision 1.441 by root, Wed May 30 15:45:40 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 */
41#ifndef EV_STANDALONE
31#if EV_USE_CONFIG_H 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>
47#include <sys/wait.h>
48#include <sys/time.h>
49#include <time.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
199#ifndef _WIN32
200# include <sys/time.h>
201# include <sys/wait.h>
202# include <unistd.h>
203#else
204# include <io.h>
205# define WIN32_LEAN_AND_MEAN
206# include <winsock2.h>
207# include <windows.h>
208# ifndef EV_SELECT_IS_WINSOCKET
209# define EV_SELECT_IS_WINSOCKET 1
210# endif
211# undef EV_AVOID_STDIO
212#endif
213
214/* OS X, in its infinite idiocy, actually HARDCODES
215 * a limit of 1024 into their select. Where people have brains,
216 * OS X engineers apparently have a vacuum. Or maybe they were
217 * ordered to have a vacuum, or they do anything for money.
218 * This might help. Or not.
219 */
220#define _DARWIN_UNLIMITED_SELECT 1
221
222/* this block tries to deduce configuration from header-defined symbols and defaults */
223
224/* try to deduce the maximum number of signals on this platform */
225#if defined EV_NSIG
226/* use what's provided */
227#elif defined NSIG
228# define EV_NSIG (NSIG)
229#elif defined _NSIG
230# define EV_NSIG (_NSIG)
231#elif defined SIGMAX
232# define EV_NSIG (SIGMAX+1)
233#elif defined SIG_MAX
234# define EV_NSIG (SIG_MAX+1)
235#elif defined _SIG_MAX
236# define EV_NSIG (_SIG_MAX+1)
237#elif defined MAXSIG
238# define EV_NSIG (MAXSIG+1)
239#elif defined MAX_SIG
240# define EV_NSIG (MAX_SIG+1)
241#elif defined SIGARRAYSIZE
242# define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
243#elif defined _sys_nsig
244# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
245#else
246# error "unable to find value for NSIG, please report"
247/* to make it compile regardless, just remove the above line, */
248/* but consider reporting it, too! :) */
249# define EV_NSIG 65
250#endif
251
252#ifndef EV_USE_FLOOR
253# define EV_USE_FLOOR 0
254#endif
255
256#ifndef EV_USE_CLOCK_SYSCALL
257# if __linux && __GLIBC__ >= 2
258# define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
259# else
260# define EV_USE_CLOCK_SYSCALL 0
261# endif
262#endif
50 263
51#ifndef EV_USE_MONOTONIC 264#ifndef EV_USE_MONOTONIC
265# if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
266# define EV_USE_MONOTONIC EV_FEATURE_OS
267# else
268# define EV_USE_MONOTONIC 0
269# endif
270#endif
271
272#ifndef EV_USE_REALTIME
273# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
274#endif
275
276#ifndef EV_USE_NANOSLEEP
277# if _POSIX_C_SOURCE >= 199309L
278# define EV_USE_NANOSLEEP EV_FEATURE_OS
279# else
280# define EV_USE_NANOSLEEP 0
281# endif
282#endif
283
284#ifndef EV_USE_SELECT
285# define EV_USE_SELECT EV_FEATURE_BACKENDS
286#endif
287
288#ifndef EV_USE_POLL
289# ifdef _WIN32
290# define EV_USE_POLL 0
291# else
292# define EV_USE_POLL EV_FEATURE_BACKENDS
293# endif
294#endif
295
296#ifndef EV_USE_EPOLL
297# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
298# define EV_USE_EPOLL EV_FEATURE_BACKENDS
299# else
300# define EV_USE_EPOLL 0
301# endif
302#endif
303
304#ifndef EV_USE_KQUEUE
305# define EV_USE_KQUEUE 0
306#endif
307
308#ifndef EV_USE_PORT
309# define EV_USE_PORT 0
310#endif
311
312#ifndef EV_USE_INOTIFY
313# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
314# define EV_USE_INOTIFY EV_FEATURE_OS
315# else
316# define EV_USE_INOTIFY 0
317# endif
318#endif
319
320#ifndef EV_PID_HASHSIZE
321# define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
322#endif
323
324#ifndef EV_INOTIFY_HASHSIZE
325# define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
326#endif
327
328#ifndef EV_USE_EVENTFD
329# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
330# define EV_USE_EVENTFD EV_FEATURE_OS
331# else
332# define EV_USE_EVENTFD 0
333# endif
334#endif
335
336#ifndef EV_USE_SIGNALFD
337# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
338# define EV_USE_SIGNALFD EV_FEATURE_OS
339# else
340# define EV_USE_SIGNALFD 0
341# endif
342#endif
343
344#if 0 /* debugging */
345# define EV_VERIFY 3
346# define EV_USE_4HEAP 1
347# define EV_HEAP_CACHE_AT 1
348#endif
349
350#ifndef EV_VERIFY
351# define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
352#endif
353
354#ifndef EV_USE_4HEAP
355# define EV_USE_4HEAP EV_FEATURE_DATA
356#endif
357
358#ifndef EV_HEAP_CACHE_AT
359# define EV_HEAP_CACHE_AT EV_FEATURE_DATA
360#endif
361
362/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
363/* which makes programs even slower. might work on other unices, too. */
364#if EV_USE_CLOCK_SYSCALL
365# include <sys/syscall.h>
366# ifdef SYS_clock_gettime
367# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
368# undef EV_USE_MONOTONIC
52# define EV_USE_MONOTONIC 1 369# define EV_USE_MONOTONIC 1
370# else
371# undef EV_USE_CLOCK_SYSCALL
372# define EV_USE_CLOCK_SYSCALL 0
373# endif
374#endif
375
376/* this block fixes any misconfiguration where we know we run into trouble otherwise */
377
378#ifdef _AIX
379/* AIX has a completely broken poll.h header */
380# undef EV_USE_POLL
381# define EV_USE_POLL 0
53#endif 382#endif
54 383
55#ifndef CLOCK_MONOTONIC 384#ifndef CLOCK_MONOTONIC
56# undef EV_USE_MONOTONIC 385# undef EV_USE_MONOTONIC
57# define EV_USE_MONOTONIC 0 386# define EV_USE_MONOTONIC 0
58#endif 387#endif
59 388
60#ifndef EV_USE_SELECT
61# define EV_USE_SELECT 1
62#endif
63
64#ifndef EV_USE_EPOLL
65# define EV_USE_EPOLL 0
66#endif
67
68#ifndef CLOCK_REALTIME 389#ifndef CLOCK_REALTIME
390# undef EV_USE_REALTIME
69# define EV_USE_REALTIME 0 391# define EV_USE_REALTIME 0
70#endif 392#endif
71#ifndef EV_USE_REALTIME 393
72# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */ 394#if !EV_STAT_ENABLE
395# undef EV_USE_INOTIFY
396# define EV_USE_INOTIFY 0
397#endif
398
399#if !EV_USE_NANOSLEEP
400/* hp-ux has it in sys/time.h, which we unconditionally include above */
401# if !defined _WIN32 && !defined __hpux
402# include <sys/select.h>
73#endif 403# endif
404#endif
405
406#if EV_USE_INOTIFY
407# include <sys/statfs.h>
408# include <sys/inotify.h>
409/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
410# ifndef IN_DONT_FOLLOW
411# undef EV_USE_INOTIFY
412# define EV_USE_INOTIFY 0
413# endif
414#endif
415
416#if EV_USE_EVENTFD
417/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
418# include <stdint.h>
419# ifndef EFD_NONBLOCK
420# define EFD_NONBLOCK O_NONBLOCK
421# endif
422# ifndef EFD_CLOEXEC
423# ifdef O_CLOEXEC
424# define EFD_CLOEXEC O_CLOEXEC
425# else
426# define EFD_CLOEXEC 02000000
427# endif
428# endif
429EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
430#endif
431
432#if EV_USE_SIGNALFD
433/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
434# include <stdint.h>
435# ifndef SFD_NONBLOCK
436# define SFD_NONBLOCK O_NONBLOCK
437# endif
438# ifndef SFD_CLOEXEC
439# ifdef O_CLOEXEC
440# define SFD_CLOEXEC O_CLOEXEC
441# else
442# define SFD_CLOEXEC 02000000
443# endif
444# endif
445EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
446
447struct signalfd_siginfo
448{
449 uint32_t ssi_signo;
450 char pad[128 - sizeof (uint32_t)];
451};
452#endif
453
454/**/
455
456#if EV_VERIFY >= 3
457# define EV_FREQUENT_CHECK ev_verify (EV_A)
458#else
459# define EV_FREQUENT_CHECK do { } while (0)
460#endif
461
462/*
463 * This is used to work around floating point rounding problems.
464 * This value is good at least till the year 4000.
465 */
466#define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
467/*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
74 468
75#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 469#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
76#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detetc time jumps) */ 470#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
77#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
78#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
79 471
80#include "ev.h" 472#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
473#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
81 474
82typedef struct ev_watcher *W; 475/* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
83typedef struct ev_watcher_list *WL; 476/* ECB.H BEGIN */
84typedef struct ev_watcher_time *WT; 477/*
478 * libecb - http://software.schmorp.de/pkg/libecb
479 *
480 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
481 * Copyright (©) 2011 Emanuele Giaquinta
482 * All rights reserved.
483 *
484 * Redistribution and use in source and binary forms, with or without modifica-
485 * tion, are permitted provided that the following conditions are met:
486 *
487 * 1. Redistributions of source code must retain the above copyright notice,
488 * this list of conditions and the following disclaimer.
489 *
490 * 2. Redistributions in binary form must reproduce the above copyright
491 * notice, this list of conditions and the following disclaimer in the
492 * documentation and/or other materials provided with the distribution.
493 *
494 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
495 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
496 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
497 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
498 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
499 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
500 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
501 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
502 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
503 * OF THE POSSIBILITY OF SUCH DAMAGE.
504 */
85 505
86static ev_tstamp now, diff; /* monotonic clock */ 506#ifndef ECB_H
87ev_tstamp ev_now; 507#define ECB_H
88int ev_method;
89 508
90static int have_monotonic; /* runtime */ 509/* 16 bits major, 16 bits minor */
510#define ECB_VERSION 0x00010001
91 511
92static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 512#ifdef _WIN32
93static void (*method_modify)(int fd, int oev, int nev); 513 typedef signed char int8_t;
94static void (*method_poll)(ev_tstamp timeout); 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;
519 #if __GNUC__
520 typedef signed long long int64_t;
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
526 #ifdef _WIN64
527 #define ECB_PTRSIZE 8
528 typedef uint64_t uintptr_t;
529 typedef int64_t intptr_t;
530 #else
531 #define ECB_PTRSIZE 4
532 typedef uint32_t uintptr_t;
533 typedef int32_t intptr_t;
534 #endif
535 typedef intptr_t ptrdiff_t;
536#else
537 #include <inttypes.h>
538 #if UINTMAX_MAX > 0xffffffffU
539 #define ECB_PTRSIZE 8
540 #else
541 #define ECB_PTRSIZE 4
542 #endif
543#endif
544
545/* many compilers define _GNUC_ to some versions but then only implement
546 * what their idiot authors think are the "more important" extensions,
547 * causing enormous grief in return for some better fake benchmark numbers.
548 * or so.
549 * we try to detect these and simply assume they are not gcc - if they have
550 * an issue with that they should have done it right in the first place.
551 */
552#ifndef ECB_GCC_VERSION
553 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
554 #define ECB_GCC_VERSION(major,minor) 0
555 #else
556 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
557 #endif
558#endif
559
560#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
561#define ECB_C99 (__STDC_VERSION__ >= 199901L)
562#define ECB_C11 (__STDC_VERSION__ >= 201112L)
563#define ECB_CPP (__cplusplus+0)
564#define ECB_CPP98 (__cplusplus >= 199711L)
565#define ECB_CPP11 (__cplusplus >= 201103L)
95 566
96/*****************************************************************************/ 567/*****************************************************************************/
97 568
569/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
570/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
571
572#if ECB_NO_THREADS
573 #define ECB_NO_SMP 1
574#endif
575
576#if ECB_NO_SMP
577 #define ECB_MEMORY_FENCE do { } while (0)
578#endif
579
580#ifndef ECB_MEMORY_FENCE
581 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
582 #if __i386 || __i386__
583 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
584 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
585 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
586 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
587 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
588 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
589 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
590 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
591 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
592 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
593 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
594 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
595 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
596 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
597 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
598 #elif __sparc || __sparc__
599 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
600 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
601 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
602 #elif defined __s390__ || defined __s390x__
603 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
604 #elif defined __mips__
605 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
606 #elif defined __alpha__
607 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
608 #elif defined __hppa__
609 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
610 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
611 #elif defined __ia64__
612 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
613 #endif
614 #endif
615#endif
616
617#ifndef ECB_MEMORY_FENCE
618 #if ECB_GCC_VERSION(4,7)
619 /* see comment below about the C11 memory model. in short - avoid */
620 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
621 #elif defined __clang && __has_feature (cxx_atomic)
622 /* see above */
623 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
624 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
625 #define ECB_MEMORY_FENCE __sync_synchronize ()
626 #elif _MSC_VER >= 1400 /* VC++ 2005 */
627 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
628 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
629 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
630 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
631 #elif defined _WIN32
632 #include <WinNT.h>
633 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
634 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
635 #include <mbarrier.h>
636 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
637 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
638 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
639 #elif __xlC__
640 #define ECB_MEMORY_FENCE __sync ()
641 #endif
642#endif
643
644#ifndef ECB_MEMORY_FENCE
645 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
646 /* we assume that these memory fences work on all variables/all memory accesses, */
647 /* not just C11 atomics and atomic accesses */
648 #include <stdatomic.h>
649 /* unfortunately, the C11 memory model seems to be very limited, and unable to express */
650 /* simple barrier semantics. That means we need to take out thor's hammer. */
651 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
652 #endif
653#endif
654
655#ifndef ECB_MEMORY_FENCE
656 #if !ECB_AVOID_PTHREADS
657 /*
658 * if you get undefined symbol references to pthread_mutex_lock,
659 * or failure to find pthread.h, then you should implement
660 * the ECB_MEMORY_FENCE operations for your cpu/compiler
661 * OR provide pthread.h and link against the posix thread library
662 * of your system.
663 */
664 #include <pthread.h>
665 #define ECB_NEEDS_PTHREADS 1
666 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
667
668 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
669 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
670 #endif
671#endif
672
673#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
674 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
675#endif
676
677#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
678 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
679#endif
680
681/*****************************************************************************/
682
683#if __cplusplus
684 #define ecb_inline static inline
685#elif ECB_GCC_VERSION(2,5)
686 #define ecb_inline static __inline__
687#elif ECB_C99
688 #define ecb_inline static inline
689#else
690 #define ecb_inline static
691#endif
692
693#if ECB_GCC_VERSION(3,3)
694 #define ecb_restrict __restrict__
695#elif ECB_C99
696 #define ecb_restrict restrict
697#else
698 #define ecb_restrict
699#endif
700
701typedef int ecb_bool;
702
703#define ECB_CONCAT_(a, b) a ## b
704#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
705#define ECB_STRINGIFY_(a) # a
706#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
707
708#define ecb_function_ ecb_inline
709
710#if ECB_GCC_VERSION(3,1)
711 #define ecb_attribute(attrlist) __attribute__(attrlist)
712 #define ecb_is_constant(expr) __builtin_constant_p (expr)
713 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
714 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
715#else
716 #define ecb_attribute(attrlist)
717 #define ecb_is_constant(expr) 0
718 #define ecb_expect(expr,value) (expr)
719 #define ecb_prefetch(addr,rw,locality)
720#endif
721
722/* no emulation for ecb_decltype */
723#if ECB_GCC_VERSION(4,5)
724 #define ecb_decltype(x) __decltype(x)
725#elif ECB_GCC_VERSION(3,0)
726 #define ecb_decltype(x) __typeof(x)
727#endif
728
729#define ecb_noinline ecb_attribute ((__noinline__))
730#define ecb_unused ecb_attribute ((__unused__))
731#define ecb_const ecb_attribute ((__const__))
732#define ecb_pure ecb_attribute ((__pure__))
733
734#if ECB_C11
735 #define ecb_noreturn _Noreturn
736#else
737 #define ecb_noreturn ecb_attribute ((__noreturn__))
738#endif
739
740#if ECB_GCC_VERSION(4,3)
741 #define ecb_artificial ecb_attribute ((__artificial__))
742 #define ecb_hot ecb_attribute ((__hot__))
743 #define ecb_cold ecb_attribute ((__cold__))
744#else
745 #define ecb_artificial
746 #define ecb_hot
747 #define ecb_cold
748#endif
749
750/* put around conditional expressions if you are very sure that the */
751/* expression is mostly true or mostly false. note that these return */
752/* booleans, not the expression. */
753#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
754#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
755/* for compatibility to the rest of the world */
756#define ecb_likely(expr) ecb_expect_true (expr)
757#define ecb_unlikely(expr) ecb_expect_false (expr)
758
759/* count trailing zero bits and count # of one bits */
760#if ECB_GCC_VERSION(3,4)
761 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
762 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
763 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
764 #define ecb_ctz32(x) __builtin_ctz (x)
765 #define ecb_ctz64(x) __builtin_ctzll (x)
766 #define ecb_popcount32(x) __builtin_popcount (x)
767 /* no popcountll */
768#else
769 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
770 ecb_function_ int
771 ecb_ctz32 (uint32_t x)
772 {
773 int r = 0;
774
775 x &= ~x + 1; /* this isolates the lowest bit */
776
777#if ECB_branchless_on_i386
778 r += !!(x & 0xaaaaaaaa) << 0;
779 r += !!(x & 0xcccccccc) << 1;
780 r += !!(x & 0xf0f0f0f0) << 2;
781 r += !!(x & 0xff00ff00) << 3;
782 r += !!(x & 0xffff0000) << 4;
783#else
784 if (x & 0xaaaaaaaa) r += 1;
785 if (x & 0xcccccccc) r += 2;
786 if (x & 0xf0f0f0f0) r += 4;
787 if (x & 0xff00ff00) r += 8;
788 if (x & 0xffff0000) r += 16;
789#endif
790
791 return r;
792 }
793
794 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
795 ecb_function_ int
796 ecb_ctz64 (uint64_t x)
797 {
798 int shift = x & 0xffffffffU ? 0 : 32;
799 return ecb_ctz32 (x >> shift) + shift;
800 }
801
802 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
803 ecb_function_ int
804 ecb_popcount32 (uint32_t x)
805 {
806 x -= (x >> 1) & 0x55555555;
807 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
808 x = ((x >> 4) + x) & 0x0f0f0f0f;
809 x *= 0x01010101;
810
811 return x >> 24;
812 }
813
814 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
815 ecb_function_ int ecb_ld32 (uint32_t x)
816 {
817 int r = 0;
818
819 if (x >> 16) { x >>= 16; r += 16; }
820 if (x >> 8) { x >>= 8; r += 8; }
821 if (x >> 4) { x >>= 4; r += 4; }
822 if (x >> 2) { x >>= 2; r += 2; }
823 if (x >> 1) { r += 1; }
824
825 return r;
826 }
827
828 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
829 ecb_function_ int ecb_ld64 (uint64_t x)
830 {
831 int r = 0;
832
833 if (x >> 32) { x >>= 32; r += 32; }
834
835 return r + ecb_ld32 (x);
836 }
837#endif
838
839ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
840ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
841ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
842ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
843
844ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
845ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
846{
847 return ( (x * 0x0802U & 0x22110U)
848 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
849}
850
851ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
852ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
853{
854 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
855 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
856 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
857 x = ( x >> 8 ) | ( x << 8);
858
859 return x;
860}
861
862ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
863ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
864{
865 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
866 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
867 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
868 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
869 x = ( x >> 16 ) | ( x << 16);
870
871 return x;
872}
873
874/* popcount64 is only available on 64 bit cpus as gcc builtin */
875/* so for this version we are lazy */
876ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
877ecb_function_ int
878ecb_popcount64 (uint64_t x)
879{
880 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
881}
882
883ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
884ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
885ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
886ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
887ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
888ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
889ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
890ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
891
892ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
893ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
894ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
895ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
896ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
897ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
898ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
899ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
900
901#if ECB_GCC_VERSION(4,3)
902 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
903 #define ecb_bswap32(x) __builtin_bswap32 (x)
904 #define ecb_bswap64(x) __builtin_bswap64 (x)
905#else
906 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
907 ecb_function_ uint16_t
908 ecb_bswap16 (uint16_t x)
909 {
910 return ecb_rotl16 (x, 8);
911 }
912
913 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
914 ecb_function_ uint32_t
915 ecb_bswap32 (uint32_t x)
916 {
917 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
918 }
919
920 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
921 ecb_function_ uint64_t
922 ecb_bswap64 (uint64_t x)
923 {
924 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
925 }
926#endif
927
928#if ECB_GCC_VERSION(4,5)
929 #define ecb_unreachable() __builtin_unreachable ()
930#else
931 /* this seems to work fine, but gcc always emits a warning for it :/ */
932 ecb_inline void ecb_unreachable (void) ecb_noreturn;
933 ecb_inline void ecb_unreachable (void) { }
934#endif
935
936/* try to tell the compiler that some condition is definitely true */
937#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
938
939ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
940ecb_inline unsigned char
941ecb_byteorder_helper (void)
942{
943 const uint32_t u = 0x11223344;
944 return *(unsigned char *)&u;
945}
946
947ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
948ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
949ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
950ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
951
952#if ECB_GCC_VERSION(3,0) || ECB_C99
953 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
954#else
955 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
956#endif
957
958#if __cplusplus
959 template<typename T>
960 static inline T ecb_div_rd (T val, T div)
961 {
962 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
963 }
964 template<typename T>
965 static inline T ecb_div_ru (T val, T div)
966 {
967 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
968 }
969#else
970 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
971 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
972#endif
973
974#if ecb_cplusplus_does_not_suck
975 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
976 template<typename T, int N>
977 static inline int ecb_array_length (const T (&arr)[N])
978 {
979 return N;
980 }
981#else
982 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
983#endif
984
985#endif
986
987/* ECB.H END */
988
989#if ECB_MEMORY_FENCE_NEEDS_PTHREADS
990/* if your architecture doesn't need memory fences, e.g. because it is
991 * single-cpu/core, or if you use libev in a project that doesn't use libev
992 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
993 * libev, in which cases the memory fences become nops.
994 * alternatively, you can remove this #error and link against libpthread,
995 * which will then provide the memory fences.
996 */
997# error "memory fences not defined for your architecture, please report"
998#endif
999
1000#ifndef ECB_MEMORY_FENCE
1001# define ECB_MEMORY_FENCE do { } while (0)
1002# define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
1003# define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
1004#endif
1005
1006#define expect_false(cond) ecb_expect_false (cond)
1007#define expect_true(cond) ecb_expect_true (cond)
1008#define noinline ecb_noinline
1009
1010#define inline_size ecb_inline
1011
1012#if EV_FEATURE_CODE
1013# define inline_speed ecb_inline
1014#else
1015# define inline_speed static noinline
1016#endif
1017
1018#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
1019
1020#if EV_MINPRI == EV_MAXPRI
1021# define ABSPRI(w) (((W)w), 0)
1022#else
1023# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
1024#endif
1025
1026#define EMPTY /* required for microsofts broken pseudo-c compiler */
1027#define EMPTY2(a,b) /* used to suppress some warnings */
1028
1029typedef ev_watcher *W;
1030typedef ev_watcher_list *WL;
1031typedef ev_watcher_time *WT;
1032
1033#define ev_active(w) ((W)(w))->active
1034#define ev_at(w) ((WT)(w))->at
1035
1036#if EV_USE_REALTIME
1037/* sig_atomic_t is used to avoid per-thread variables or locking but still */
1038/* giving it a reasonably high chance of working on typical architectures */
1039static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
1040#endif
1041
1042#if EV_USE_MONOTONIC
1043static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
1044#endif
1045
1046#ifndef EV_FD_TO_WIN32_HANDLE
1047# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
1048#endif
1049#ifndef EV_WIN32_HANDLE_TO_FD
1050# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
1051#endif
1052#ifndef EV_WIN32_CLOSE_FD
1053# define EV_WIN32_CLOSE_FD(fd) close (fd)
1054#endif
1055
1056#ifdef _WIN32
1057# include "ev_win32.c"
1058#endif
1059
1060/*****************************************************************************/
1061
1062/* define a suitable floor function (only used by periodics atm) */
1063
1064#if EV_USE_FLOOR
1065# include <math.h>
1066# define ev_floor(v) floor (v)
1067#else
1068
1069#include <float.h>
1070
1071/* a floor() replacement function, should be independent of ev_tstamp type */
1072static ev_tstamp noinline
1073ev_floor (ev_tstamp v)
1074{
1075 /* the choice of shift factor is not terribly important */
1076#if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1077 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1078#else
1079 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1080#endif
1081
1082 /* argument too large for an unsigned long? */
1083 if (expect_false (v >= shift))
1084 {
1085 ev_tstamp f;
1086
1087 if (v == v - 1.)
1088 return v; /* very large number */
1089
1090 f = shift * ev_floor (v * (1. / shift));
1091 return f + ev_floor (v - f);
1092 }
1093
1094 /* special treatment for negative args? */
1095 if (expect_false (v < 0.))
1096 {
1097 ev_tstamp f = -ev_floor (-v);
1098
1099 return f - (f == v ? 0 : 1);
1100 }
1101
1102 /* fits into an unsigned long */
1103 return (unsigned long)v;
1104}
1105
1106#endif
1107
1108/*****************************************************************************/
1109
1110#ifdef __linux
1111# include <sys/utsname.h>
1112#endif
1113
1114static unsigned int noinline ecb_cold
1115ev_linux_version (void)
1116{
1117#ifdef __linux
1118 unsigned int v = 0;
1119 struct utsname buf;
1120 int i;
1121 char *p = buf.release;
1122
1123 if (uname (&buf))
1124 return 0;
1125
1126 for (i = 3+1; --i; )
1127 {
1128 unsigned int c = 0;
1129
1130 for (;;)
1131 {
1132 if (*p >= '0' && *p <= '9')
1133 c = c * 10 + *p++ - '0';
1134 else
1135 {
1136 p += *p == '.';
1137 break;
1138 }
1139 }
1140
1141 v = (v << 8) | c;
1142 }
1143
1144 return v;
1145#else
1146 return 0;
1147#endif
1148}
1149
1150/*****************************************************************************/
1151
1152#if EV_AVOID_STDIO
1153static void noinline ecb_cold
1154ev_printerr (const char *msg)
1155{
1156 write (STDERR_FILENO, msg, strlen (msg));
1157}
1158#endif
1159
1160static void (*syserr_cb)(const char *msg) EV_THROW;
1161
1162void ecb_cold
1163ev_set_syserr_cb (void (*cb)(const char *msg) EV_THROW) EV_THROW
1164{
1165 syserr_cb = cb;
1166}
1167
1168static void noinline ecb_cold
1169ev_syserr (const char *msg)
1170{
1171 if (!msg)
1172 msg = "(libev) system error";
1173
1174 if (syserr_cb)
1175 syserr_cb (msg);
1176 else
1177 {
1178#if EV_AVOID_STDIO
1179 ev_printerr (msg);
1180 ev_printerr (": ");
1181 ev_printerr (strerror (errno));
1182 ev_printerr ("\n");
1183#else
1184 perror (msg);
1185#endif
1186 abort ();
1187 }
1188}
1189
1190static void *
1191ev_realloc_emul (void *ptr, long size) EV_THROW
1192{
1193#if __GLIBC__
1194 return realloc (ptr, size);
1195#else
1196 /* some systems, notably openbsd and darwin, fail to properly
1197 * implement realloc (x, 0) (as required by both ansi c-89 and
1198 * the single unix specification, so work around them here.
1199 */
1200
1201 if (size)
1202 return realloc (ptr, size);
1203
1204 free (ptr);
1205 return 0;
1206#endif
1207}
1208
1209static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1210
1211void ecb_cold
1212ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
1213{
1214 alloc = cb;
1215}
1216
1217inline_speed void *
1218ev_realloc (void *ptr, long size)
1219{
1220 ptr = alloc (ptr, size);
1221
1222 if (!ptr && size)
1223 {
1224#if EV_AVOID_STDIO
1225 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1226#else
1227 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1228#endif
1229 abort ();
1230 }
1231
1232 return ptr;
1233}
1234
1235#define ev_malloc(size) ev_realloc (0, (size))
1236#define ev_free(ptr) ev_realloc ((ptr), 0)
1237
1238/*****************************************************************************/
1239
1240/* set in reify when reification needed */
1241#define EV_ANFD_REIFY 1
1242
1243/* file descriptor info structure */
1244typedef struct
1245{
1246 WL head;
1247 unsigned char events; /* the events watched for */
1248 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1249 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1250 unsigned char unused;
1251#if EV_USE_EPOLL
1252 unsigned int egen; /* generation counter to counter epoll bugs */
1253#endif
1254#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1255 SOCKET handle;
1256#endif
1257#if EV_USE_IOCP
1258 OVERLAPPED or, ow;
1259#endif
1260} ANFD;
1261
1262/* stores the pending event set for a given watcher */
1263typedef struct
1264{
1265 W w;
1266 int events; /* the pending event set for the given watcher */
1267} ANPENDING;
1268
1269#if EV_USE_INOTIFY
1270/* hash table entry per inotify-id */
1271typedef struct
1272{
1273 WL head;
1274} ANFS;
1275#endif
1276
1277/* Heap Entry */
1278#if EV_HEAP_CACHE_AT
1279 /* a heap element */
1280 typedef struct {
1281 ev_tstamp at;
1282 WT w;
1283 } ANHE;
1284
1285 #define ANHE_w(he) (he).w /* access watcher, read-write */
1286 #define ANHE_at(he) (he).at /* access cached at, read-only */
1287 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1288#else
1289 /* a heap element */
1290 typedef WT ANHE;
1291
1292 #define ANHE_w(he) (he)
1293 #define ANHE_at(he) (he)->at
1294 #define ANHE_at_cache(he)
1295#endif
1296
1297#if EV_MULTIPLICITY
1298
1299 struct ev_loop
1300 {
1301 ev_tstamp ev_rt_now;
1302 #define ev_rt_now ((loop)->ev_rt_now)
1303 #define VAR(name,decl) decl;
1304 #include "ev_vars.h"
1305 #undef VAR
1306 };
1307 #include "ev_wrap.h"
1308
1309 static struct ev_loop default_loop_struct;
1310 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1311
1312#else
1313
1314 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1315 #define VAR(name,decl) static decl;
1316 #include "ev_vars.h"
1317 #undef VAR
1318
1319 static int ev_default_loop_ptr;
1320
1321#endif
1322
1323#if EV_FEATURE_API
1324# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1325# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1326# define EV_INVOKE_PENDING invoke_cb (EV_A)
1327#else
1328# define EV_RELEASE_CB (void)0
1329# define EV_ACQUIRE_CB (void)0
1330# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1331#endif
1332
1333#define EVBREAK_RECURSE 0x80
1334
1335/*****************************************************************************/
1336
1337#ifndef EV_HAVE_EV_TIME
98ev_tstamp 1338ev_tstamp
99ev_time (void) 1339ev_time (void) EV_THROW
100{ 1340{
101#if EV_USE_REALTIME 1341#if EV_USE_REALTIME
1342 if (expect_true (have_realtime))
1343 {
102 struct timespec ts; 1344 struct timespec ts;
103 clock_gettime (CLOCK_REALTIME, &ts); 1345 clock_gettime (CLOCK_REALTIME, &ts);
104 return ts.tv_sec + ts.tv_nsec * 1e-9; 1346 return ts.tv_sec + ts.tv_nsec * 1e-9;
105#else 1347 }
1348#endif
1349
106 struct timeval tv; 1350 struct timeval tv;
107 gettimeofday (&tv, 0); 1351 gettimeofday (&tv, 0);
108 return tv.tv_sec + tv.tv_usec * 1e-6; 1352 return tv.tv_sec + tv.tv_usec * 1e-6;
109#endif
110} 1353}
1354#endif
111 1355
112static ev_tstamp 1356inline_size ev_tstamp
113get_clock (void) 1357get_clock (void)
114{ 1358{
115#if EV_USE_MONOTONIC 1359#if EV_USE_MONOTONIC
116 if (have_monotonic) 1360 if (expect_true (have_monotonic))
117 { 1361 {
118 struct timespec ts; 1362 struct timespec ts;
119 clock_gettime (CLOCK_MONOTONIC, &ts); 1363 clock_gettime (CLOCK_MONOTONIC, &ts);
120 return ts.tv_sec + ts.tv_nsec * 1e-9; 1364 return ts.tv_sec + ts.tv_nsec * 1e-9;
121 } 1365 }
122#endif 1366#endif
123 1367
124 return ev_time (); 1368 return ev_time ();
125} 1369}
126 1370
127#define array_roundsize(base,n) ((n) | 4 & ~3) 1371#if EV_MULTIPLICITY
1372ev_tstamp
1373ev_now (EV_P) EV_THROW
1374{
1375 return ev_rt_now;
1376}
1377#endif
128 1378
129#define array_needsize(base,cur,cnt,init) \ 1379void
130 if ((cnt) > cur) \ 1380ev_sleep (ev_tstamp delay) EV_THROW
131 { \ 1381{
132 int newcnt = cur; \ 1382 if (delay > 0.)
133 do \
134 { \
135 newcnt = array_roundsize (base, newcnt << 1); \
136 } \
137 while ((cnt) > newcnt); \
138 \
139 base = realloc (base, sizeof (*base) * (newcnt)); \
140 init (base + cur, newcnt - cur); \
141 cur = newcnt; \
142 } 1383 {
1384#if EV_USE_NANOSLEEP
1385 struct timespec ts;
1386
1387 EV_TS_SET (ts, delay);
1388 nanosleep (&ts, 0);
1389#elif defined _WIN32
1390 Sleep ((unsigned long)(delay * 1e3));
1391#else
1392 struct timeval tv;
1393
1394 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1395 /* something not guaranteed by newer posix versions, but guaranteed */
1396 /* by older ones */
1397 EV_TV_SET (tv, delay);
1398 select (0, 0, 0, 0, &tv);
1399#endif
1400 }
1401}
143 1402
144/*****************************************************************************/ 1403/*****************************************************************************/
145 1404
146typedef struct 1405#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
147{
148 struct ev_io *head;
149 unsigned char events;
150 unsigned char reify;
151} ANFD;
152 1406
153static ANFD *anfds; 1407/* find a suitable new size for the given array, */
154static int anfdmax; 1408/* hopefully by rounding to a nice-to-malloc size */
155 1409inline_size int
156static void 1410array_nextsize (int elem, int cur, int cnt)
157anfds_init (ANFD *base, int count)
158{ 1411{
159 while (count--) 1412 int ncur = cur + 1;
160 {
161 base->head = 0;
162 base->events = EV_NONE;
163 base->reify = 0;
164 1413
165 ++base; 1414 do
1415 ncur <<= 1;
1416 while (cnt > ncur);
1417
1418 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1419 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
166 } 1420 {
167} 1421 ncur *= elem;
168 1422 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
169typedef struct 1423 ncur = ncur - sizeof (void *) * 4;
170{ 1424 ncur /= elem;
171 W w;
172 int events;
173} ANPENDING;
174
175static ANPENDING *pendings;
176static int pendingmax, pendingcnt;
177
178static void
179event (W w, int events)
180{
181 if (w->pending)
182 { 1425 }
1426
1427 return ncur;
1428}
1429
1430static void * noinline ecb_cold
1431array_realloc (int elem, void *base, int *cur, int cnt)
1432{
1433 *cur = array_nextsize (elem, *cur, cnt);
1434 return ev_realloc (base, elem * *cur);
1435}
1436
1437#define array_init_zero(base,count) \
1438 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1439
1440#define array_needsize(type,base,cur,cnt,init) \
1441 if (expect_false ((cnt) > (cur))) \
1442 { \
1443 int ecb_unused ocur_ = (cur); \
1444 (base) = (type *)array_realloc \
1445 (sizeof (type), (base), &(cur), (cnt)); \
1446 init ((base) + (ocur_), (cur) - ocur_); \
1447 }
1448
1449#if 0
1450#define array_slim(type,stem) \
1451 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1452 { \
1453 stem ## max = array_roundsize (stem ## cnt >> 1); \
1454 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1455 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1456 }
1457#endif
1458
1459#define array_free(stem, idx) \
1460 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1461
1462/*****************************************************************************/
1463
1464/* dummy callback for pending events */
1465static void noinline
1466pendingcb (EV_P_ ev_prepare *w, int revents)
1467{
1468}
1469
1470void noinline
1471ev_feed_event (EV_P_ void *w, int revents) EV_THROW
1472{
1473 W w_ = (W)w;
1474 int pri = ABSPRI (w_);
1475
1476 if (expect_false (w_->pending))
1477 pendings [pri][w_->pending - 1].events |= revents;
1478 else
1479 {
1480 w_->pending = ++pendingcnt [pri];
1481 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1482 pendings [pri][w_->pending - 1].w = w_;
183 pendings [w->pending - 1].events |= events; 1483 pendings [pri][w_->pending - 1].events = revents;
184 return;
185 } 1484 }
186 1485
187 w->pending = ++pendingcnt; 1486 pendingpri = NUMPRI - 1;
188 array_needsize (pendings, pendingmax, pendingcnt, );
189 pendings [pendingcnt - 1].w = w;
190 pendings [pendingcnt - 1].events = events;
191} 1487}
192 1488
193static void 1489inline_speed void
1490feed_reverse (EV_P_ W w)
1491{
1492 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1493 rfeeds [rfeedcnt++] = w;
1494}
1495
1496inline_size void
1497feed_reverse_done (EV_P_ int revents)
1498{
1499 do
1500 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1501 while (rfeedcnt);
1502}
1503
1504inline_speed void
194queue_events (W *events, int eventcnt, int type) 1505queue_events (EV_P_ W *events, int eventcnt, int type)
195{ 1506{
196 int i; 1507 int i;
197 1508
198 for (i = 0; i < eventcnt; ++i) 1509 for (i = 0; i < eventcnt; ++i)
199 event (events [i], type); 1510 ev_feed_event (EV_A_ events [i], type);
200} 1511}
201 1512
202static void 1513/*****************************************************************************/
1514
1515inline_speed void
203fd_event (int fd, int events) 1516fd_event_nocheck (EV_P_ int fd, int revents)
204{ 1517{
205 ANFD *anfd = anfds + fd; 1518 ANFD *anfd = anfds + fd;
206 struct ev_io *w; 1519 ev_io *w;
207 1520
208 for (w = anfd->head; w; w = w->next) 1521 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
209 { 1522 {
210 int ev = w->events & events; 1523 int ev = w->events & revents;
211 1524
212 if (ev) 1525 if (ev)
213 event ((W)w, ev); 1526 ev_feed_event (EV_A_ (W)w, ev);
214 } 1527 }
215} 1528}
216 1529
217/*****************************************************************************/ 1530/* do not submit kernel events for fds that have reify set */
1531/* because that means they changed while we were polling for new events */
1532inline_speed void
1533fd_event (EV_P_ int fd, int revents)
1534{
1535 ANFD *anfd = anfds + fd;
218 1536
219static int *fdchanges; 1537 if (expect_true (!anfd->reify))
220static int fdchangemax, fdchangecnt; 1538 fd_event_nocheck (EV_A_ fd, revents);
1539}
221 1540
222static void 1541void
223fd_reify (void) 1542ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
1543{
1544 if (fd >= 0 && fd < anfdmax)
1545 fd_event_nocheck (EV_A_ fd, revents);
1546}
1547
1548/* make sure the external fd watch events are in-sync */
1549/* with the kernel/libev internal state */
1550inline_size void
1551fd_reify (EV_P)
224{ 1552{
225 int i; 1553 int i;
226 1554
1555#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
227 for (i = 0; i < fdchangecnt; ++i) 1556 for (i = 0; i < fdchangecnt; ++i)
228 { 1557 {
229 int fd = fdchanges [i]; 1558 int fd = fdchanges [i];
230 ANFD *anfd = anfds + fd; 1559 ANFD *anfd = anfds + fd;
231 struct ev_io *w;
232 1560
233 int events = 0; 1561 if (anfd->reify & EV__IOFDSET && anfd->head)
234
235 for (w = anfd->head; w; w = w->next)
236 events |= w->events;
237
238 anfd->reify = 0;
239
240 if (anfd->events != events)
241 { 1562 {
1563 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1564
1565 if (handle != anfd->handle)
1566 {
1567 unsigned long arg;
1568
1569 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1570
1571 /* handle changed, but fd didn't - we need to do it in two steps */
242 method_modify (fd, anfd->events, events); 1572 backend_modify (EV_A_ fd, anfd->events, 0);
243 anfd->events = events; 1573 anfd->events = 0;
1574 anfd->handle = handle;
1575 }
244 } 1576 }
245 } 1577 }
1578#endif
1579
1580 for (i = 0; i < fdchangecnt; ++i)
1581 {
1582 int fd = fdchanges [i];
1583 ANFD *anfd = anfds + fd;
1584 ev_io *w;
1585
1586 unsigned char o_events = anfd->events;
1587 unsigned char o_reify = anfd->reify;
1588
1589 anfd->reify = 0;
1590
1591 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1592 {
1593 anfd->events = 0;
1594
1595 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1596 anfd->events |= (unsigned char)w->events;
1597
1598 if (o_events != anfd->events)
1599 o_reify = EV__IOFDSET; /* actually |= */
1600 }
1601
1602 if (o_reify & EV__IOFDSET)
1603 backend_modify (EV_A_ fd, o_events, anfd->events);
1604 }
246 1605
247 fdchangecnt = 0; 1606 fdchangecnt = 0;
248} 1607}
249 1608
250static void 1609/* something about the given fd changed */
251fd_change (int fd) 1610inline_size void
1611fd_change (EV_P_ int fd, int flags)
252{ 1612{
253 if (anfds [fd].reify || fdchangecnt < 0) 1613 unsigned char reify = anfds [fd].reify;
254 return;
255
256 anfds [fd].reify = 1; 1614 anfds [fd].reify |= flags;
257 1615
1616 if (expect_true (!reify))
1617 {
258 ++fdchangecnt; 1618 ++fdchangecnt;
259 array_needsize (fdchanges, fdchangemax, fdchangecnt, ); 1619 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
260 fdchanges [fdchangecnt - 1] = fd; 1620 fdchanges [fdchangecnt - 1] = fd;
1621 }
1622}
1623
1624/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1625inline_speed void ecb_cold
1626fd_kill (EV_P_ int fd)
1627{
1628 ev_io *w;
1629
1630 while ((w = (ev_io *)anfds [fd].head))
1631 {
1632 ev_io_stop (EV_A_ w);
1633 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1634 }
1635}
1636
1637/* check whether the given fd is actually valid, for error recovery */
1638inline_size int ecb_cold
1639fd_valid (int fd)
1640{
1641#ifdef _WIN32
1642 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1643#else
1644 return fcntl (fd, F_GETFD) != -1;
1645#endif
261} 1646}
262 1647
263/* called on EBADF to verify fds */ 1648/* called on EBADF to verify fds */
264static void 1649static void noinline ecb_cold
265fd_recheck (void) 1650fd_ebadf (EV_P)
266{ 1651{
267 int fd; 1652 int fd;
268 1653
269 for (fd = 0; fd < anfdmax; ++fd) 1654 for (fd = 0; fd < anfdmax; ++fd)
270 if (anfds [fd].events) 1655 if (anfds [fd].events)
271 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF) 1656 if (!fd_valid (fd) && errno == EBADF)
272 while (anfds [fd].head) 1657 fd_kill (EV_A_ fd);
1658}
1659
1660/* called on ENOMEM in select/poll to kill some fds and retry */
1661static void noinline ecb_cold
1662fd_enomem (EV_P)
1663{
1664 int fd;
1665
1666 for (fd = anfdmax; fd--; )
1667 if (anfds [fd].events)
1668 {
1669 fd_kill (EV_A_ fd);
1670 break;
1671 }
1672}
1673
1674/* usually called after fork if backend needs to re-arm all fds from scratch */
1675static void noinline
1676fd_rearm_all (EV_P)
1677{
1678 int fd;
1679
1680 for (fd = 0; fd < anfdmax; ++fd)
1681 if (anfds [fd].events)
1682 {
1683 anfds [fd].events = 0;
1684 anfds [fd].emask = 0;
1685 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1686 }
1687}
1688
1689/* used to prepare libev internal fd's */
1690/* this is not fork-safe */
1691inline_speed void
1692fd_intern (int fd)
1693{
1694#ifdef _WIN32
1695 unsigned long arg = 1;
1696 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1697#else
1698 fcntl (fd, F_SETFD, FD_CLOEXEC);
1699 fcntl (fd, F_SETFL, O_NONBLOCK);
1700#endif
1701}
1702
1703/*****************************************************************************/
1704
1705/*
1706 * the heap functions want a real array index. array index 0 is guaranteed to not
1707 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1708 * the branching factor of the d-tree.
1709 */
1710
1711/*
1712 * at the moment we allow libev the luxury of two heaps,
1713 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1714 * which is more cache-efficient.
1715 * the difference is about 5% with 50000+ watchers.
1716 */
1717#if EV_USE_4HEAP
1718
1719#define DHEAP 4
1720#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1721#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1722#define UPHEAP_DONE(p,k) ((p) == (k))
1723
1724/* away from the root */
1725inline_speed void
1726downheap (ANHE *heap, int N, int k)
1727{
1728 ANHE he = heap [k];
1729 ANHE *E = heap + N + HEAP0;
1730
1731 for (;;)
1732 {
1733 ev_tstamp minat;
1734 ANHE *minpos;
1735 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1736
1737 /* find minimum child */
1738 if (expect_true (pos + DHEAP - 1 < E))
1739 {
1740 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1741 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1742 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1743 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1744 }
1745 else if (pos < E)
1746 {
1747 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1748 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1749 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1750 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1751 }
1752 else
1753 break;
1754
1755 if (ANHE_at (he) <= minat)
1756 break;
1757
1758 heap [k] = *minpos;
1759 ev_active (ANHE_w (*minpos)) = k;
1760
1761 k = minpos - heap;
1762 }
1763
1764 heap [k] = he;
1765 ev_active (ANHE_w (he)) = k;
1766}
1767
1768#else /* 4HEAP */
1769
1770#define HEAP0 1
1771#define HPARENT(k) ((k) >> 1)
1772#define UPHEAP_DONE(p,k) (!(p))
1773
1774/* away from the root */
1775inline_speed void
1776downheap (ANHE *heap, int N, int k)
1777{
1778 ANHE he = heap [k];
1779
1780 for (;;)
1781 {
1782 int c = k << 1;
1783
1784 if (c >= N + HEAP0)
1785 break;
1786
1787 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1788 ? 1 : 0;
1789
1790 if (ANHE_at (he) <= ANHE_at (heap [c]))
1791 break;
1792
1793 heap [k] = heap [c];
1794 ev_active (ANHE_w (heap [k])) = k;
1795
1796 k = c;
1797 }
1798
1799 heap [k] = he;
1800 ev_active (ANHE_w (he)) = k;
1801}
1802#endif
1803
1804/* towards the root */
1805inline_speed void
1806upheap (ANHE *heap, int k)
1807{
1808 ANHE he = heap [k];
1809
1810 for (;;)
1811 {
1812 int p = HPARENT (k);
1813
1814 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1815 break;
1816
1817 heap [k] = heap [p];
1818 ev_active (ANHE_w (heap [k])) = k;
1819 k = p;
1820 }
1821
1822 heap [k] = he;
1823 ev_active (ANHE_w (he)) = k;
1824}
1825
1826/* move an element suitably so it is in a correct place */
1827inline_size void
1828adjustheap (ANHE *heap, int N, int k)
1829{
1830 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1831 upheap (heap, k);
1832 else
1833 downheap (heap, N, k);
1834}
1835
1836/* rebuild the heap: this function is used only once and executed rarely */
1837inline_size void
1838reheap (ANHE *heap, int N)
1839{
1840 int i;
1841
1842 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1843 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1844 for (i = 0; i < N; ++i)
1845 upheap (heap, i + HEAP0);
1846}
1847
1848/*****************************************************************************/
1849
1850/* associate signal watchers to a signal signal */
1851typedef struct
1852{
1853 EV_ATOMIC_T pending;
1854#if EV_MULTIPLICITY
1855 EV_P;
1856#endif
1857 WL head;
1858} ANSIG;
1859
1860static ANSIG signals [EV_NSIG - 1];
1861
1862/*****************************************************************************/
1863
1864#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1865
1866static void noinline ecb_cold
1867evpipe_init (EV_P)
1868{
1869 if (!ev_is_active (&pipe_w))
1870 {
1871# if EV_USE_EVENTFD
1872 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1873 if (evfd < 0 && errno == EINVAL)
1874 evfd = eventfd (0, 0);
1875
1876 if (evfd >= 0)
1877 {
1878 evpipe [0] = -1;
1879 fd_intern (evfd); /* doing it twice doesn't hurt */
1880 ev_io_set (&pipe_w, evfd, EV_READ);
1881 }
1882 else
1883# endif
1884 {
1885 while (pipe (evpipe))
1886 ev_syserr ("(libev) error creating signal/async pipe");
1887
1888 fd_intern (evpipe [0]);
1889 fd_intern (evpipe [1]);
1890 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1891 }
1892
1893 ev_io_start (EV_A_ &pipe_w);
1894 ev_unref (EV_A); /* watcher should not keep loop alive */
1895 }
1896}
1897
1898inline_speed void
1899evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1900{
1901 ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
1902
1903 if (expect_true (*flag))
1904 return;
1905
1906 *flag = 1;
1907 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1908
1909 pipe_write_skipped = 1;
1910
1911 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1912
1913 if (pipe_write_wanted)
1914 {
1915 int old_errno;
1916
1917 pipe_write_skipped = 0;
1918 ECB_MEMORY_FENCE_RELEASE;
1919
1920 old_errno = errno; /* save errno because write will clobber it */
1921
1922#if EV_USE_EVENTFD
1923 if (evfd >= 0)
1924 {
1925 uint64_t counter = 1;
1926 write (evfd, &counter, sizeof (uint64_t));
1927 }
1928 else
1929#endif
1930 {
1931#ifdef _WIN32
1932 WSABUF buf;
1933 DWORD sent;
1934 buf.buf = &buf;
1935 buf.len = 1;
1936 WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
1937#else
1938 write (evpipe [1], &(evpipe [1]), 1);
1939#endif
1940 }
1941
1942 errno = old_errno;
1943 }
1944}
1945
1946/* called whenever the libev signal pipe */
1947/* got some events (signal, async) */
1948static void
1949pipecb (EV_P_ ev_io *iow, int revents)
1950{
1951 int i;
1952
1953 if (revents & EV_READ)
1954 {
1955#if EV_USE_EVENTFD
1956 if (evfd >= 0)
1957 {
1958 uint64_t counter;
1959 read (evfd, &counter, sizeof (uint64_t));
1960 }
1961 else
1962#endif
1963 {
1964 char dummy[4];
1965#ifdef _WIN32
1966 WSABUF buf;
1967 DWORD recvd;
1968 DWORD flags = 0;
1969 buf.buf = dummy;
1970 buf.len = sizeof (dummy);
1971 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
1972#else
1973 read (evpipe [0], &dummy, sizeof (dummy));
1974#endif
1975 }
1976 }
1977
1978 pipe_write_skipped = 0;
1979
1980 ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
1981
1982#if EV_SIGNAL_ENABLE
1983 if (sig_pending)
1984 {
1985 sig_pending = 0;
1986
1987 ECB_MEMORY_FENCE;
1988
1989 for (i = EV_NSIG - 1; i--; )
1990 if (expect_false (signals [i].pending))
1991 ev_feed_signal_event (EV_A_ i + 1);
1992 }
1993#endif
1994
1995#if EV_ASYNC_ENABLE
1996 if (async_pending)
1997 {
1998 async_pending = 0;
1999
2000 ECB_MEMORY_FENCE;
2001
2002 for (i = asynccnt; i--; )
2003 if (asyncs [i]->sent)
273 { 2004 {
274 ev_io_stop (anfds [fd].head); 2005 asyncs [i]->sent = 0;
275 event ((W)anfds [fd].head, EV_ERROR | EV_READ | EV_WRITE); 2006 ECB_MEMORY_FENCE_RELEASE;
2007 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
276 } 2008 }
2009 }
2010#endif
277} 2011}
278 2012
279/*****************************************************************************/ 2013/*****************************************************************************/
280 2014
281static struct ev_timer **timers; 2015void
282static int timermax, timercnt; 2016ev_feed_signal (int signum) EV_THROW
2017{
2018#if EV_MULTIPLICITY
2019 EV_P = signals [signum - 1].loop;
283 2020
284static struct ev_periodic **periodics; 2021 if (!EV_A)
285static int periodicmax, periodiccnt; 2022 return;
2023#endif
2024
2025 if (!ev_active (&pipe_w))
2026 return;
2027
2028 signals [signum - 1].pending = 1;
2029 evpipe_write (EV_A_ &sig_pending);
2030}
286 2031
287static void 2032static void
288upheap (WT *timers, int k) 2033ev_sighandler (int signum)
289{ 2034{
290 WT w = timers [k]; 2035#ifdef _WIN32
2036 signal (signum, ev_sighandler);
2037#endif
291 2038
292 while (k && timers [k >> 1]->at > w->at) 2039 ev_feed_signal (signum);
293 {
294 timers [k] = timers [k >> 1];
295 timers [k]->active = k + 1;
296 k >>= 1;
297 }
298
299 timers [k] = w;
300 timers [k]->active = k + 1;
301
302} 2040}
303 2041
2042void noinline
2043ev_feed_signal_event (EV_P_ int signum) EV_THROW
2044{
2045 WL w;
2046
2047 if (expect_false (signum <= 0 || signum > EV_NSIG))
2048 return;
2049
2050 --signum;
2051
2052#if EV_MULTIPLICITY
2053 /* it is permissible to try to feed a signal to the wrong loop */
2054 /* or, likely more useful, feeding a signal nobody is waiting for */
2055
2056 if (expect_false (signals [signum].loop != EV_A))
2057 return;
2058#endif
2059
2060 signals [signum].pending = 0;
2061 ECB_MEMORY_FENCE_RELEASE;
2062
2063 for (w = signals [signum].head; w; w = w->next)
2064 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2065}
2066
2067#if EV_USE_SIGNALFD
304static void 2068static void
305downheap (WT *timers, int N, int k) 2069sigfdcb (EV_P_ ev_io *iow, int revents)
306{ 2070{
307 WT w = timers [k]; 2071 struct signalfd_siginfo si[2], *sip; /* these structs are big */
308 2072
309 while (k < (N >> 1)) 2073 for (;;)
310 { 2074 {
311 int j = k << 1; 2075 ssize_t res = read (sigfd, si, sizeof (si));
312 2076
313 if (j + 1 < N && timers [j]->at > timers [j + 1]->at) 2077 /* not ISO-C, as res might be -1, but works with SuS */
314 ++j; 2078 for (sip = si; (char *)sip < (char *)si + res; ++sip)
2079 ev_feed_signal_event (EV_A_ sip->ssi_signo);
315 2080
316 if (w->at <= timers [j]->at) 2081 if (res < (ssize_t)sizeof (si))
317 break; 2082 break;
318
319 timers [k] = timers [j];
320 timers [k]->active = k + 1;
321 k = j;
322 } 2083 }
323
324 timers [k] = w;
325 timers [k]->active = k + 1;
326} 2084}
2085#endif
2086
2087#endif
327 2088
328/*****************************************************************************/ 2089/*****************************************************************************/
329 2090
330typedef struct 2091#if EV_CHILD_ENABLE
331{ 2092static WL childs [EV_PID_HASHSIZE];
332 struct ev_signal *head;
333 sig_atomic_t volatile gotsig;
334} ANSIG;
335 2093
336static ANSIG *signals;
337static int signalmax;
338
339static int sigpipe [2];
340static sig_atomic_t volatile gotsig;
341static struct ev_io sigev;
342
343static void
344signals_init (ANSIG *base, int count)
345{
346 while (count--)
347 {
348 base->head = 0;
349 base->gotsig = 0;
350
351 ++base;
352 }
353}
354
355static void
356sighandler (int signum)
357{
358 signals [signum - 1].gotsig = 1;
359
360 if (!gotsig)
361 {
362 gotsig = 1;
363 write (sigpipe [1], &signum, 1);
364 }
365}
366
367static void
368sigcb (struct ev_io *iow, int revents)
369{
370 struct ev_signal *w;
371 int signum;
372
373 read (sigpipe [0], &revents, 1);
374 gotsig = 0;
375
376 for (signum = signalmax; signum--; )
377 if (signals [signum].gotsig)
378 {
379 signals [signum].gotsig = 0;
380
381 for (w = signals [signum].head; w; w = w->next)
382 event ((W)w, EV_SIGNAL);
383 }
384}
385
386static void
387siginit (void)
388{
389 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
390 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
391
392 /* rather than sort out wether we really need nb, set it */
393 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
394 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
395
396 ev_io_set (&sigev, sigpipe [0], EV_READ);
397 ev_io_start (&sigev);
398}
399
400/*****************************************************************************/
401
402static struct ev_idle **idles;
403static int idlemax, idlecnt;
404
405static struct ev_prepare **prepares;
406static int preparemax, preparecnt;
407
408static struct ev_check **checks;
409static int checkmax, checkcnt;
410
411/*****************************************************************************/
412
413static struct ev_child *childs [PID_HASHSIZE];
414static struct ev_signal childev; 2094static ev_signal childev;
2095
2096#ifndef WIFCONTINUED
2097# define WIFCONTINUED(status) 0
2098#endif
2099
2100/* handle a single child status event */
2101inline_speed void
2102child_reap (EV_P_ int chain, int pid, int status)
2103{
2104 ev_child *w;
2105 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2106
2107 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2108 {
2109 if ((w->pid == pid || !w->pid)
2110 && (!traced || (w->flags & 1)))
2111 {
2112 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2113 w->rpid = pid;
2114 w->rstatus = status;
2115 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2116 }
2117 }
2118}
415 2119
416#ifndef WCONTINUED 2120#ifndef WCONTINUED
417# define WCONTINUED 0 2121# define WCONTINUED 0
418#endif 2122#endif
419 2123
2124/* called on sigchld etc., calls waitpid */
420static void 2125static void
421childcb (struct ev_signal *sw, int revents) 2126childcb (EV_P_ ev_signal *sw, int revents)
422{ 2127{
423 struct ev_child *w;
424 int pid, status; 2128 int pid, status;
425 2129
2130 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
426 while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1) 2131 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
427 for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next) 2132 if (!WCONTINUED
428 if (w->pid == pid || !w->pid) 2133 || errno != EINVAL
429 { 2134 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
430 w->status = status; 2135 return;
431 event ((W)w, EV_CHILD); 2136
432 } 2137 /* make sure we are called again until all children have been reaped */
2138 /* we need to do it this way so that the callback gets called before we continue */
2139 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2140
2141 child_reap (EV_A_ pid, pid, status);
2142 if ((EV_PID_HASHSIZE) > 1)
2143 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
433} 2144}
2145
2146#endif
434 2147
435/*****************************************************************************/ 2148/*****************************************************************************/
436 2149
2150#if EV_USE_IOCP
2151# include "ev_iocp.c"
2152#endif
2153#if EV_USE_PORT
2154# include "ev_port.c"
2155#endif
2156#if EV_USE_KQUEUE
2157# include "ev_kqueue.c"
2158#endif
437#if EV_USE_EPOLL 2159#if EV_USE_EPOLL
438# include "ev_epoll.c" 2160# include "ev_epoll.c"
439#endif 2161#endif
2162#if EV_USE_POLL
2163# include "ev_poll.c"
2164#endif
440#if EV_USE_SELECT 2165#if EV_USE_SELECT
441# include "ev_select.c" 2166# include "ev_select.c"
442#endif 2167#endif
443 2168
2169int ecb_cold
2170ev_version_major (void) EV_THROW
2171{
2172 return EV_VERSION_MAJOR;
2173}
2174
2175int ecb_cold
2176ev_version_minor (void) EV_THROW
2177{
2178 return EV_VERSION_MINOR;
2179}
2180
2181/* return true if we are running with elevated privileges and should ignore env variables */
2182int inline_size ecb_cold
2183enable_secure (void)
2184{
2185#ifdef _WIN32
2186 return 0;
2187#else
2188 return getuid () != geteuid ()
2189 || getgid () != getegid ();
2190#endif
2191}
2192
2193unsigned int ecb_cold
2194ev_supported_backends (void) EV_THROW
2195{
2196 unsigned int flags = 0;
2197
2198 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2199 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2200 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2201 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2202 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2203
2204 return flags;
2205}
2206
2207unsigned int ecb_cold
2208ev_recommended_backends (void) EV_THROW
2209{
2210 unsigned int flags = ev_supported_backends ();
2211
2212#ifndef __NetBSD__
2213 /* kqueue is borked on everything but netbsd apparently */
2214 /* it usually doesn't work correctly on anything but sockets and pipes */
2215 flags &= ~EVBACKEND_KQUEUE;
2216#endif
2217#ifdef __APPLE__
2218 /* only select works correctly on that "unix-certified" platform */
2219 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2220 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2221#endif
2222#ifdef __FreeBSD__
2223 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2224#endif
2225
2226 return flags;
2227}
2228
2229unsigned int ecb_cold
2230ev_embeddable_backends (void) EV_THROW
2231{
2232 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2233
2234 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2235 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2236 flags &= ~EVBACKEND_EPOLL;
2237
2238 return flags;
2239}
2240
2241unsigned int
2242ev_backend (EV_P) EV_THROW
2243{
2244 return backend;
2245}
2246
2247#if EV_FEATURE_API
2248unsigned int
2249ev_iteration (EV_P) EV_THROW
2250{
2251 return loop_count;
2252}
2253
2254unsigned int
2255ev_depth (EV_P) EV_THROW
2256{
2257 return loop_depth;
2258}
2259
2260void
2261ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2262{
2263 io_blocktime = interval;
2264}
2265
2266void
2267ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2268{
2269 timeout_blocktime = interval;
2270}
2271
2272void
2273ev_set_userdata (EV_P_ void *data) EV_THROW
2274{
2275 userdata = data;
2276}
2277
2278void *
2279ev_userdata (EV_P) EV_THROW
2280{
2281 return userdata;
2282}
2283
2284void
2285ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) EV_THROW
2286{
2287 invoke_cb = invoke_pending_cb;
2288}
2289
2290void
2291ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
2292{
2293 release_cb = release;
2294 acquire_cb = acquire;
2295}
2296#endif
2297
2298/* initialise a loop structure, must be zero-initialised */
2299static void noinline ecb_cold
2300loop_init (EV_P_ unsigned int flags) EV_THROW
2301{
2302 if (!backend)
2303 {
2304 origflags = flags;
2305
2306#if EV_USE_REALTIME
2307 if (!have_realtime)
2308 {
2309 struct timespec ts;
2310
2311 if (!clock_gettime (CLOCK_REALTIME, &ts))
2312 have_realtime = 1;
2313 }
2314#endif
2315
2316#if EV_USE_MONOTONIC
2317 if (!have_monotonic)
2318 {
2319 struct timespec ts;
2320
2321 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2322 have_monotonic = 1;
2323 }
2324#endif
2325
2326 /* pid check not overridable via env */
2327#ifndef _WIN32
2328 if (flags & EVFLAG_FORKCHECK)
2329 curpid = getpid ();
2330#endif
2331
2332 if (!(flags & EVFLAG_NOENV)
2333 && !enable_secure ()
2334 && getenv ("LIBEV_FLAGS"))
2335 flags = atoi (getenv ("LIBEV_FLAGS"));
2336
2337 ev_rt_now = ev_time ();
2338 mn_now = get_clock ();
2339 now_floor = mn_now;
2340 rtmn_diff = ev_rt_now - mn_now;
2341#if EV_FEATURE_API
2342 invoke_cb = ev_invoke_pending;
2343#endif
2344
2345 io_blocktime = 0.;
2346 timeout_blocktime = 0.;
2347 backend = 0;
2348 backend_fd = -1;
2349 sig_pending = 0;
2350#if EV_ASYNC_ENABLE
2351 async_pending = 0;
2352#endif
2353 pipe_write_skipped = 0;
2354 pipe_write_wanted = 0;
2355#if EV_USE_INOTIFY
2356 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2357#endif
2358#if EV_USE_SIGNALFD
2359 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2360#endif
2361
2362 if (!(flags & EVBACKEND_MASK))
2363 flags |= ev_recommended_backends ();
2364
2365#if EV_USE_IOCP
2366 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2367#endif
2368#if EV_USE_PORT
2369 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2370#endif
2371#if EV_USE_KQUEUE
2372 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2373#endif
2374#if EV_USE_EPOLL
2375 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2376#endif
2377#if EV_USE_POLL
2378 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2379#endif
2380#if EV_USE_SELECT
2381 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2382#endif
2383
2384 ev_prepare_init (&pending_w, pendingcb);
2385
2386#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2387 ev_init (&pipe_w, pipecb);
2388 ev_set_priority (&pipe_w, EV_MAXPRI);
2389#endif
2390 }
2391}
2392
2393/* free up a loop structure */
2394void ecb_cold
2395ev_loop_destroy (EV_P)
2396{
2397 int i;
2398
2399#if EV_MULTIPLICITY
2400 /* mimic free (0) */
2401 if (!EV_A)
2402 return;
2403#endif
2404
2405#if EV_CLEANUP_ENABLE
2406 /* queue cleanup watchers (and execute them) */
2407 if (expect_false (cleanupcnt))
2408 {
2409 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2410 EV_INVOKE_PENDING;
2411 }
2412#endif
2413
2414#if EV_CHILD_ENABLE
2415 if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
2416 {
2417 ev_ref (EV_A); /* child watcher */
2418 ev_signal_stop (EV_A_ &childev);
2419 }
2420#endif
2421
2422 if (ev_is_active (&pipe_w))
2423 {
2424 /*ev_ref (EV_A);*/
2425 /*ev_io_stop (EV_A_ &pipe_w);*/
2426
2427#if EV_USE_EVENTFD
2428 if (evfd >= 0)
2429 close (evfd);
2430#endif
2431
2432 if (evpipe [0] >= 0)
2433 {
2434 EV_WIN32_CLOSE_FD (evpipe [0]);
2435 EV_WIN32_CLOSE_FD (evpipe [1]);
2436 }
2437 }
2438
2439#if EV_USE_SIGNALFD
2440 if (ev_is_active (&sigfd_w))
2441 close (sigfd);
2442#endif
2443
2444#if EV_USE_INOTIFY
2445 if (fs_fd >= 0)
2446 close (fs_fd);
2447#endif
2448
2449 if (backend_fd >= 0)
2450 close (backend_fd);
2451
2452#if EV_USE_IOCP
2453 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2454#endif
2455#if EV_USE_PORT
2456 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2457#endif
2458#if EV_USE_KQUEUE
2459 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2460#endif
2461#if EV_USE_EPOLL
2462 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2463#endif
2464#if EV_USE_POLL
2465 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2466#endif
2467#if EV_USE_SELECT
2468 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2469#endif
2470
2471 for (i = NUMPRI; i--; )
2472 {
2473 array_free (pending, [i]);
2474#if EV_IDLE_ENABLE
2475 array_free (idle, [i]);
2476#endif
2477 }
2478
2479 ev_free (anfds); anfds = 0; anfdmax = 0;
2480
2481 /* have to use the microsoft-never-gets-it-right macro */
2482 array_free (rfeed, EMPTY);
2483 array_free (fdchange, EMPTY);
2484 array_free (timer, EMPTY);
2485#if EV_PERIODIC_ENABLE
2486 array_free (periodic, EMPTY);
2487#endif
2488#if EV_FORK_ENABLE
2489 array_free (fork, EMPTY);
2490#endif
2491#if EV_CLEANUP_ENABLE
2492 array_free (cleanup, EMPTY);
2493#endif
2494 array_free (prepare, EMPTY);
2495 array_free (check, EMPTY);
2496#if EV_ASYNC_ENABLE
2497 array_free (async, EMPTY);
2498#endif
2499
2500 backend = 0;
2501
2502#if EV_MULTIPLICITY
2503 if (ev_is_default_loop (EV_A))
2504#endif
2505 ev_default_loop_ptr = 0;
2506#if EV_MULTIPLICITY
2507 else
2508 ev_free (EV_A);
2509#endif
2510}
2511
2512#if EV_USE_INOTIFY
2513inline_size void infy_fork (EV_P);
2514#endif
2515
2516inline_size void
2517loop_fork (EV_P)
2518{
2519#if EV_USE_PORT
2520 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2521#endif
2522#if EV_USE_KQUEUE
2523 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2524#endif
2525#if EV_USE_EPOLL
2526 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2527#endif
2528#if EV_USE_INOTIFY
2529 infy_fork (EV_A);
2530#endif
2531
2532 if (ev_is_active (&pipe_w))
2533 {
2534 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2535
2536 ev_ref (EV_A);
2537 ev_io_stop (EV_A_ &pipe_w);
2538
2539#if EV_USE_EVENTFD
2540 if (evfd >= 0)
2541 close (evfd);
2542#endif
2543
2544 if (evpipe [0] >= 0)
2545 {
2546 EV_WIN32_CLOSE_FD (evpipe [0]);
2547 EV_WIN32_CLOSE_FD (evpipe [1]);
2548 }
2549
2550#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2551 evpipe_init (EV_A);
2552 /* now iterate over everything, in case we missed something */
2553 pipecb (EV_A_ &pipe_w, EV_READ);
2554#endif
2555 }
2556
2557 postfork = 0;
2558}
2559
2560#if EV_MULTIPLICITY
2561
2562struct ev_loop * ecb_cold
2563ev_loop_new (unsigned int flags) EV_THROW
2564{
2565 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2566
2567 memset (EV_A, 0, sizeof (struct ev_loop));
2568 loop_init (EV_A_ flags);
2569
2570 if (ev_backend (EV_A))
2571 return EV_A;
2572
2573 ev_free (EV_A);
2574 return 0;
2575}
2576
2577#endif /* multiplicity */
2578
2579#if EV_VERIFY
2580static void noinline ecb_cold
2581verify_watcher (EV_P_ W w)
2582{
2583 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2584
2585 if (w->pending)
2586 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2587}
2588
2589static void noinline ecb_cold
2590verify_heap (EV_P_ ANHE *heap, int N)
2591{
2592 int i;
2593
2594 for (i = HEAP0; i < N + HEAP0; ++i)
2595 {
2596 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2597 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2598 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2599
2600 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2601 }
2602}
2603
2604static void noinline ecb_cold
2605array_verify (EV_P_ W *ws, int cnt)
2606{
2607 while (cnt--)
2608 {
2609 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2610 verify_watcher (EV_A_ ws [cnt]);
2611 }
2612}
2613#endif
2614
2615#if EV_FEATURE_API
2616void ecb_cold
2617ev_verify (EV_P) EV_THROW
2618{
2619#if EV_VERIFY
2620 int i;
2621 WL w, w2;
2622
2623 assert (activecnt >= -1);
2624
2625 assert (fdchangemax >= fdchangecnt);
2626 for (i = 0; i < fdchangecnt; ++i)
2627 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2628
2629 assert (anfdmax >= 0);
2630 for (i = 0; i < anfdmax; ++i)
2631 {
2632 int j = 0;
2633
2634 for (w = w2 = anfds [i].head; w; w = w->next)
2635 {
2636 verify_watcher (EV_A_ (W)w);
2637
2638 if (j++ & 1)
2639 {
2640 assert (("libev: io watcher list contains a loop", w != w2));
2641 w2 = w2->next;
2642 }
2643
2644 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2645 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2646 }
2647 }
2648
2649 assert (timermax >= timercnt);
2650 verify_heap (EV_A_ timers, timercnt);
2651
2652#if EV_PERIODIC_ENABLE
2653 assert (periodicmax >= periodiccnt);
2654 verify_heap (EV_A_ periodics, periodiccnt);
2655#endif
2656
2657 for (i = NUMPRI; i--; )
2658 {
2659 assert (pendingmax [i] >= pendingcnt [i]);
2660#if EV_IDLE_ENABLE
2661 assert (idleall >= 0);
2662 assert (idlemax [i] >= idlecnt [i]);
2663 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2664#endif
2665 }
2666
2667#if EV_FORK_ENABLE
2668 assert (forkmax >= forkcnt);
2669 array_verify (EV_A_ (W *)forks, forkcnt);
2670#endif
2671
2672#if EV_CLEANUP_ENABLE
2673 assert (cleanupmax >= cleanupcnt);
2674 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2675#endif
2676
2677#if EV_ASYNC_ENABLE
2678 assert (asyncmax >= asynccnt);
2679 array_verify (EV_A_ (W *)asyncs, asynccnt);
2680#endif
2681
2682#if EV_PREPARE_ENABLE
2683 assert (preparemax >= preparecnt);
2684 array_verify (EV_A_ (W *)prepares, preparecnt);
2685#endif
2686
2687#if EV_CHECK_ENABLE
2688 assert (checkmax >= checkcnt);
2689 array_verify (EV_A_ (W *)checks, checkcnt);
2690#endif
2691
2692# if 0
2693#if EV_CHILD_ENABLE
2694 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2695 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2696#endif
2697# endif
2698#endif
2699}
2700#endif
2701
2702#if EV_MULTIPLICITY
2703struct ev_loop * ecb_cold
2704#else
444int 2705int
445ev_version_major (void) 2706#endif
2707ev_default_loop (unsigned int flags) EV_THROW
446{ 2708{
447 return EV_VERSION_MAJOR; 2709 if (!ev_default_loop_ptr)
2710 {
2711#if EV_MULTIPLICITY
2712 EV_P = ev_default_loop_ptr = &default_loop_struct;
2713#else
2714 ev_default_loop_ptr = 1;
2715#endif
2716
2717 loop_init (EV_A_ flags);
2718
2719 if (ev_backend (EV_A))
2720 {
2721#if EV_CHILD_ENABLE
2722 ev_signal_init (&childev, childcb, SIGCHLD);
2723 ev_set_priority (&childev, EV_MAXPRI);
2724 ev_signal_start (EV_A_ &childev);
2725 ev_unref (EV_A); /* child watcher should not keep loop alive */
2726#endif
2727 }
2728 else
2729 ev_default_loop_ptr = 0;
2730 }
2731
2732 return ev_default_loop_ptr;
2733}
2734
2735void
2736ev_loop_fork (EV_P) EV_THROW
2737{
2738 postfork = 1;
2739}
2740
2741/*****************************************************************************/
2742
2743void
2744ev_invoke (EV_P_ void *w, int revents)
2745{
2746 EV_CB_INVOKE ((W)w, revents);
2747}
2748
2749unsigned int
2750ev_pending_count (EV_P) EV_THROW
2751{
2752 int pri;
2753 unsigned int count = 0;
2754
2755 for (pri = NUMPRI; pri--; )
2756 count += pendingcnt [pri];
2757
2758 return count;
2759}
2760
2761void noinline
2762ev_invoke_pending (EV_P)
2763{
2764 for (pendingpri = NUMPRI; pendingpri--; ) /* pendingpri is modified during the loop */
2765 while (pendingcnt [pendingpri])
2766 {
2767 ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
2768
2769 p->w->pending = 0;
2770 EV_CB_INVOKE (p->w, p->events);
2771 EV_FREQUENT_CHECK;
2772 }
2773}
2774
2775#if EV_IDLE_ENABLE
2776/* make idle watchers pending. this handles the "call-idle */
2777/* only when higher priorities are idle" logic */
2778inline_size void
2779idle_reify (EV_P)
2780{
2781 if (expect_false (idleall))
2782 {
2783 int pri;
2784
2785 for (pri = NUMPRI; pri--; )
2786 {
2787 if (pendingcnt [pri])
2788 break;
2789
2790 if (idlecnt [pri])
2791 {
2792 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2793 break;
2794 }
2795 }
2796 }
2797}
2798#endif
2799
2800/* make timers pending */
2801inline_size void
2802timers_reify (EV_P)
2803{
2804 EV_FREQUENT_CHECK;
2805
2806 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2807 {
2808 do
2809 {
2810 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2811
2812 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2813
2814 /* first reschedule or stop timer */
2815 if (w->repeat)
2816 {
2817 ev_at (w) += w->repeat;
2818 if (ev_at (w) < mn_now)
2819 ev_at (w) = mn_now;
2820
2821 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2822
2823 ANHE_at_cache (timers [HEAP0]);
2824 downheap (timers, timercnt, HEAP0);
2825 }
2826 else
2827 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2828
2829 EV_FREQUENT_CHECK;
2830 feed_reverse (EV_A_ (W)w);
2831 }
2832 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2833
2834 feed_reverse_done (EV_A_ EV_TIMER);
2835 }
2836}
2837
2838#if EV_PERIODIC_ENABLE
2839
2840static void noinline
2841periodic_recalc (EV_P_ ev_periodic *w)
2842{
2843 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2844 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2845
2846 /* the above almost always errs on the low side */
2847 while (at <= ev_rt_now)
2848 {
2849 ev_tstamp nat = at + w->interval;
2850
2851 /* when resolution fails us, we use ev_rt_now */
2852 if (expect_false (nat == at))
2853 {
2854 at = ev_rt_now;
2855 break;
2856 }
2857
2858 at = nat;
2859 }
2860
2861 ev_at (w) = at;
2862}
2863
2864/* make periodics pending */
2865inline_size void
2866periodics_reify (EV_P)
2867{
2868 EV_FREQUENT_CHECK;
2869
2870 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2871 {
2872 do
2873 {
2874 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2875
2876 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2877
2878 /* first reschedule or stop timer */
2879 if (w->reschedule_cb)
2880 {
2881 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2882
2883 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2884
2885 ANHE_at_cache (periodics [HEAP0]);
2886 downheap (periodics, periodiccnt, HEAP0);
2887 }
2888 else if (w->interval)
2889 {
2890 periodic_recalc (EV_A_ w);
2891 ANHE_at_cache (periodics [HEAP0]);
2892 downheap (periodics, periodiccnt, HEAP0);
2893 }
2894 else
2895 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2896
2897 EV_FREQUENT_CHECK;
2898 feed_reverse (EV_A_ (W)w);
2899 }
2900 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2901
2902 feed_reverse_done (EV_A_ EV_PERIODIC);
2903 }
2904}
2905
2906/* simply recalculate all periodics */
2907/* TODO: maybe ensure that at least one event happens when jumping forward? */
2908static void noinline ecb_cold
2909periodics_reschedule (EV_P)
2910{
2911 int i;
2912
2913 /* adjust periodics after time jump */
2914 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2915 {
2916 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2917
2918 if (w->reschedule_cb)
2919 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2920 else if (w->interval)
2921 periodic_recalc (EV_A_ w);
2922
2923 ANHE_at_cache (periodics [i]);
2924 }
2925
2926 reheap (periodics, periodiccnt);
2927}
2928#endif
2929
2930/* adjust all timers by a given offset */
2931static void noinline ecb_cold
2932timers_reschedule (EV_P_ ev_tstamp adjust)
2933{
2934 int i;
2935
2936 for (i = 0; i < timercnt; ++i)
2937 {
2938 ANHE *he = timers + i + HEAP0;
2939 ANHE_w (*he)->at += adjust;
2940 ANHE_at_cache (*he);
2941 }
2942}
2943
2944/* fetch new monotonic and realtime times from the kernel */
2945/* also detect if there was a timejump, and act accordingly */
2946inline_speed void
2947time_update (EV_P_ ev_tstamp max_block)
2948{
2949#if EV_USE_MONOTONIC
2950 if (expect_true (have_monotonic))
2951 {
2952 int i;
2953 ev_tstamp odiff = rtmn_diff;
2954
2955 mn_now = get_clock ();
2956
2957 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2958 /* interpolate in the meantime */
2959 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2960 {
2961 ev_rt_now = rtmn_diff + mn_now;
2962 return;
2963 }
2964
2965 now_floor = mn_now;
2966 ev_rt_now = ev_time ();
2967
2968 /* loop a few times, before making important decisions.
2969 * on the choice of "4": one iteration isn't enough,
2970 * in case we get preempted during the calls to
2971 * ev_time and get_clock. a second call is almost guaranteed
2972 * to succeed in that case, though. and looping a few more times
2973 * doesn't hurt either as we only do this on time-jumps or
2974 * in the unlikely event of having been preempted here.
2975 */
2976 for (i = 4; --i; )
2977 {
2978 ev_tstamp diff;
2979 rtmn_diff = ev_rt_now - mn_now;
2980
2981 diff = odiff - rtmn_diff;
2982
2983 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2984 return; /* all is well */
2985
2986 ev_rt_now = ev_time ();
2987 mn_now = get_clock ();
2988 now_floor = mn_now;
2989 }
2990
2991 /* no timer adjustment, as the monotonic clock doesn't jump */
2992 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2993# if EV_PERIODIC_ENABLE
2994 periodics_reschedule (EV_A);
2995# endif
2996 }
2997 else
2998#endif
2999 {
3000 ev_rt_now = ev_time ();
3001
3002 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
3003 {
3004 /* adjust timers. this is easy, as the offset is the same for all of them */
3005 timers_reschedule (EV_A_ ev_rt_now - mn_now);
3006#if EV_PERIODIC_ENABLE
3007 periodics_reschedule (EV_A);
3008#endif
3009 }
3010
3011 mn_now = ev_rt_now;
3012 }
448} 3013}
449 3014
450int 3015int
451ev_version_minor (void) 3016ev_run (EV_P_ int flags)
452{ 3017{
453 return EV_VERSION_MINOR; 3018#if EV_FEATURE_API
454} 3019 ++loop_depth;
3020#endif
455 3021
456int ev_init (int flags) 3022 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
457{ 3023
458 if (!ev_method) 3024 loop_done = EVBREAK_CANCEL;
3025
3026 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
3027
3028 do
459 { 3029 {
460#if EV_USE_MONOTONIC 3030#if EV_VERIFY >= 2
3031 ev_verify (EV_A);
3032#endif
3033
3034#ifndef _WIN32
3035 if (expect_false (curpid)) /* penalise the forking check even more */
3036 if (expect_false (getpid () != curpid))
3037 {
3038 curpid = getpid ();
3039 postfork = 1;
3040 }
3041#endif
3042
3043#if EV_FORK_ENABLE
3044 /* we might have forked, so queue fork handlers */
3045 if (expect_false (postfork))
3046 if (forkcnt)
3047 {
3048 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
3049 EV_INVOKE_PENDING;
3050 }
3051#endif
3052
3053#if EV_PREPARE_ENABLE
3054 /* queue prepare watchers (and execute them) */
3055 if (expect_false (preparecnt))
3056 {
3057 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
3058 EV_INVOKE_PENDING;
3059 }
3060#endif
3061
3062 if (expect_false (loop_done))
3063 break;
3064
3065 /* we might have forked, so reify kernel state if necessary */
3066 if (expect_false (postfork))
3067 loop_fork (EV_A);
3068
3069 /* update fd-related kernel structures */
3070 fd_reify (EV_A);
3071
3072 /* calculate blocking time */
461 { 3073 {
462 struct timespec ts; 3074 ev_tstamp waittime = 0.;
463 if (!clock_gettime (CLOCK_MONOTONIC, &ts)) 3075 ev_tstamp sleeptime = 0.;
464 have_monotonic = 1; 3076
3077 /* remember old timestamp for io_blocktime calculation */
3078 ev_tstamp prev_mn_now = mn_now;
3079
3080 /* update time to cancel out callback processing overhead */
3081 time_update (EV_A_ 1e100);
3082
3083 /* from now on, we want a pipe-wake-up */
3084 pipe_write_wanted = 1;
3085
3086 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3087
3088 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3089 {
3090 waittime = MAX_BLOCKTIME;
3091
3092 if (timercnt)
3093 {
3094 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3095 if (waittime > to) waittime = to;
3096 }
3097
3098#if EV_PERIODIC_ENABLE
3099 if (periodiccnt)
3100 {
3101 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3102 if (waittime > to) waittime = to;
3103 }
3104#endif
3105
3106 /* don't let timeouts decrease the waittime below timeout_blocktime */
3107 if (expect_false (waittime < timeout_blocktime))
3108 waittime = timeout_blocktime;
3109
3110 /* at this point, we NEED to wait, so we have to ensure */
3111 /* to pass a minimum nonzero value to the backend */
3112 if (expect_false (waittime < backend_mintime))
3113 waittime = backend_mintime;
3114
3115 /* extra check because io_blocktime is commonly 0 */
3116 if (expect_false (io_blocktime))
3117 {
3118 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3119
3120 if (sleeptime > waittime - backend_mintime)
3121 sleeptime = waittime - backend_mintime;
3122
3123 if (expect_true (sleeptime > 0.))
3124 {
3125 ev_sleep (sleeptime);
3126 waittime -= sleeptime;
3127 }
3128 }
3129 }
3130
3131#if EV_FEATURE_API
3132 ++loop_count;
3133#endif
3134 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3135 backend_poll (EV_A_ waittime);
3136 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3137
3138 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3139
3140 MEMORY_FENCE_ACQUIRE;
3141 if (pipe_write_skipped)
3142 {
3143 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3144 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3145 }
3146
3147
3148 /* update ev_rt_now, do magic */
3149 time_update (EV_A_ waittime + sleeptime);
465 } 3150 }
466#endif
467 3151
468 ev_now = ev_time (); 3152 /* queue pending timers and reschedule them */
469 now = get_clock (); 3153 timers_reify (EV_A); /* relative timers called last */
470 diff = ev_now - now; 3154#if EV_PERIODIC_ENABLE
471 3155 periodics_reify (EV_A); /* absolute timers called first */
472 if (pipe (sigpipe))
473 return 0;
474
475 ev_method = EVMETHOD_NONE;
476#if EV_USE_EPOLL
477 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
478#endif 3156#endif
479#if EV_USE_SELECT
480 if (ev_method == EVMETHOD_NONE) select_init (flags);
481#endif
482 3157
483 if (ev_method) 3158#if EV_IDLE_ENABLE
3159 /* queue idle watchers unless other events are pending */
3160 idle_reify (EV_A);
3161#endif
3162
3163#if EV_CHECK_ENABLE
3164 /* queue check watchers, to be executed first */
3165 if (expect_false (checkcnt))
3166 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3167#endif
3168
3169 EV_INVOKE_PENDING;
3170 }
3171 while (expect_true (
3172 activecnt
3173 && !loop_done
3174 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3175 ));
3176
3177 if (loop_done == EVBREAK_ONE)
3178 loop_done = EVBREAK_CANCEL;
3179
3180#if EV_FEATURE_API
3181 --loop_depth;
3182#endif
3183
3184 return activecnt;
3185}
3186
3187void
3188ev_break (EV_P_ int how) EV_THROW
3189{
3190 loop_done = how;
3191}
3192
3193void
3194ev_ref (EV_P) EV_THROW
3195{
3196 ++activecnt;
3197}
3198
3199void
3200ev_unref (EV_P) EV_THROW
3201{
3202 --activecnt;
3203}
3204
3205void
3206ev_now_update (EV_P) EV_THROW
3207{
3208 time_update (EV_A_ 1e100);
3209}
3210
3211void
3212ev_suspend (EV_P) EV_THROW
3213{
3214 ev_now_update (EV_A);
3215}
3216
3217void
3218ev_resume (EV_P) EV_THROW
3219{
3220 ev_tstamp mn_prev = mn_now;
3221
3222 ev_now_update (EV_A);
3223 timers_reschedule (EV_A_ mn_now - mn_prev);
3224#if EV_PERIODIC_ENABLE
3225 /* TODO: really do this? */
3226 periodics_reschedule (EV_A);
3227#endif
3228}
3229
3230/*****************************************************************************/
3231/* singly-linked list management, used when the expected list length is short */
3232
3233inline_size void
3234wlist_add (WL *head, WL elem)
3235{
3236 elem->next = *head;
3237 *head = elem;
3238}
3239
3240inline_size void
3241wlist_del (WL *head, WL elem)
3242{
3243 while (*head)
3244 {
3245 if (expect_true (*head == elem))
484 { 3246 {
485 ev_watcher_init (&sigev, sigcb); 3247 *head = elem->next;
486 siginit (); 3248 break;
487
488 ev_signal_init (&childev, childcb, SIGCHLD);
489 ev_signal_start (&childev);
490 } 3249 }
3250
3251 head = &(*head)->next;
3252 }
3253}
3254
3255/* internal, faster, version of ev_clear_pending */
3256inline_speed void
3257clear_pending (EV_P_ W w)
3258{
3259 if (w->pending)
491 } 3260 {
3261 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3262 w->pending = 0;
3263 }
3264}
492 3265
493 return ev_method; 3266int
3267ev_clear_pending (EV_P_ void *w) EV_THROW
3268{
3269 W w_ = (W)w;
3270 int pending = w_->pending;
3271
3272 if (expect_true (pending))
3273 {
3274 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3275 p->w = (W)&pending_w;
3276 w_->pending = 0;
3277 return p->events;
3278 }
3279 else
3280 return 0;
3281}
3282
3283inline_size void
3284pri_adjust (EV_P_ W w)
3285{
3286 int pri = ev_priority (w);
3287 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3288 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3289 ev_set_priority (w, pri);
3290}
3291
3292inline_speed void
3293ev_start (EV_P_ W w, int active)
3294{
3295 pri_adjust (EV_A_ w);
3296 w->active = active;
3297 ev_ref (EV_A);
3298}
3299
3300inline_size void
3301ev_stop (EV_P_ W w)
3302{
3303 ev_unref (EV_A);
3304 w->active = 0;
494} 3305}
495 3306
496/*****************************************************************************/ 3307/*****************************************************************************/
497 3308
498void 3309void noinline
499ev_fork_prepare (void) 3310ev_io_start (EV_P_ ev_io *w) EV_THROW
500{ 3311{
501 /* nop */ 3312 int fd = w->fd;
502}
503 3313
504void 3314 if (expect_false (ev_is_active (w)))
505ev_fork_parent (void) 3315 return;
506{
507 /* nop */
508}
509 3316
510void 3317 assert (("libev: ev_io_start called with negative fd", fd >= 0));
511ev_fork_child (void) 3318 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
512{
513#if EV_USE_EPOLL
514 if (ev_method == EVMETHOD_EPOLL)
515 epoll_postfork_child ();
516#endif
517 3319
518 ev_io_stop (&sigev); 3320 EV_FREQUENT_CHECK;
519 close (sigpipe [0]);
520 close (sigpipe [1]);
521 pipe (sigpipe);
522 siginit ();
523}
524 3321
525/*****************************************************************************/ 3322 ev_start (EV_A_ (W)w, 1);
3323 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3324 wlist_add (&anfds[fd].head, (WL)w);
526 3325
527static void 3326 /* common bug, apparently */
528call_pending (void) 3327 assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
3328
3329 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3330 w->events &= ~EV__IOFDSET;
3331
3332 EV_FREQUENT_CHECK;
3333}
3334
3335void noinline
3336ev_io_stop (EV_P_ ev_io *w) EV_THROW
529{ 3337{
530 while (pendingcnt) 3338 clear_pending (EV_A_ (W)w);
3339 if (expect_false (!ev_is_active (w)))
3340 return;
3341
3342 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3343
3344 EV_FREQUENT_CHECK;
3345
3346 wlist_del (&anfds[w->fd].head, (WL)w);
3347 ev_stop (EV_A_ (W)w);
3348
3349 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3350
3351 EV_FREQUENT_CHECK;
3352}
3353
3354void noinline
3355ev_timer_start (EV_P_ ev_timer *w) EV_THROW
3356{
3357 if (expect_false (ev_is_active (w)))
3358 return;
3359
3360 ev_at (w) += mn_now;
3361
3362 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3363
3364 EV_FREQUENT_CHECK;
3365
3366 ++timercnt;
3367 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3368 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3369 ANHE_w (timers [ev_active (w)]) = (WT)w;
3370 ANHE_at_cache (timers [ev_active (w)]);
3371 upheap (timers, ev_active (w));
3372
3373 EV_FREQUENT_CHECK;
3374
3375 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3376}
3377
3378void noinline
3379ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
3380{
3381 clear_pending (EV_A_ (W)w);
3382 if (expect_false (!ev_is_active (w)))
3383 return;
3384
3385 EV_FREQUENT_CHECK;
3386
531 { 3387 {
532 ANPENDING *p = pendings + --pendingcnt; 3388 int active = ev_active (w);
533 3389
534 if (p->w) 3390 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3391
3392 --timercnt;
3393
3394 if (expect_true (active < timercnt + HEAP0))
535 { 3395 {
536 p->w->pending = 0; 3396 timers [active] = timers [timercnt + HEAP0];
537 p->w->cb (p->w, p->events); 3397 adjustheap (timers, timercnt, active);
538 } 3398 }
3399 }
3400
3401 ev_at (w) -= mn_now;
3402
3403 ev_stop (EV_A_ (W)w);
3404
3405 EV_FREQUENT_CHECK;
3406}
3407
3408void noinline
3409ev_timer_again (EV_P_ ev_timer *w) EV_THROW
3410{
3411 EV_FREQUENT_CHECK;
3412
3413 clear_pending (EV_A_ (W)w);
3414
3415 if (ev_is_active (w))
539 } 3416 {
540}
541
542static void
543timers_reify (void)
544{
545 while (timercnt && timers [0]->at <= now)
546 {
547 struct ev_timer *w = timers [0];
548
549 /* first reschedule or stop timer */
550 if (w->repeat) 3417 if (w->repeat)
551 { 3418 {
552 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
553 w->at = now + w->repeat; 3419 ev_at (w) = mn_now + w->repeat;
554 downheap ((WT *)timers, timercnt, 0); 3420 ANHE_at_cache (timers [ev_active (w)]);
3421 adjustheap (timers, timercnt, ev_active (w));
555 } 3422 }
556 else 3423 else
557 ev_timer_stop (w); /* nonrepeating: stop timer */ 3424 ev_timer_stop (EV_A_ w);
558
559 event ((W)w, EV_TIMEOUT);
560 }
561}
562
563static void
564periodics_reify (void)
565{
566 while (periodiccnt && periodics [0]->at <= ev_now)
567 { 3425 }
568 struct ev_periodic *w = periodics [0]; 3426 else if (w->repeat)
3427 {
3428 ev_at (w) = w->repeat;
3429 ev_timer_start (EV_A_ w);
3430 }
569 3431
570 /* first reschedule or stop timer */ 3432 EV_FREQUENT_CHECK;
3433}
3434
3435ev_tstamp
3436ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
3437{
3438 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3439}
3440
3441#if EV_PERIODIC_ENABLE
3442void noinline
3443ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
3444{
3445 if (expect_false (ev_is_active (w)))
3446 return;
3447
3448 if (w->reschedule_cb)
3449 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
571 if (w->interval) 3450 else if (w->interval)
3451 {
3452 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3453 periodic_recalc (EV_A_ w);
3454 }
3455 else
3456 ev_at (w) = w->offset;
3457
3458 EV_FREQUENT_CHECK;
3459
3460 ++periodiccnt;
3461 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3462 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3463 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3464 ANHE_at_cache (periodics [ev_active (w)]);
3465 upheap (periodics, ev_active (w));
3466
3467 EV_FREQUENT_CHECK;
3468
3469 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3470}
3471
3472void noinline
3473ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
3474{
3475 clear_pending (EV_A_ (W)w);
3476 if (expect_false (!ev_is_active (w)))
3477 return;
3478
3479 EV_FREQUENT_CHECK;
3480
3481 {
3482 int active = ev_active (w);
3483
3484 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3485
3486 --periodiccnt;
3487
3488 if (expect_true (active < periodiccnt + HEAP0))
3489 {
3490 periodics [active] = periodics [periodiccnt + HEAP0];
3491 adjustheap (periodics, periodiccnt, active);
3492 }
3493 }
3494
3495 ev_stop (EV_A_ (W)w);
3496
3497 EV_FREQUENT_CHECK;
3498}
3499
3500void noinline
3501ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
3502{
3503 /* TODO: use adjustheap and recalculation */
3504 ev_periodic_stop (EV_A_ w);
3505 ev_periodic_start (EV_A_ w);
3506}
3507#endif
3508
3509#ifndef SA_RESTART
3510# define SA_RESTART 0
3511#endif
3512
3513#if EV_SIGNAL_ENABLE
3514
3515void noinline
3516ev_signal_start (EV_P_ ev_signal *w) EV_THROW
3517{
3518 if (expect_false (ev_is_active (w)))
3519 return;
3520
3521 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3522
3523#if EV_MULTIPLICITY
3524 assert (("libev: a signal must not be attached to two different loops",
3525 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3526
3527 signals [w->signum - 1].loop = EV_A;
3528#endif
3529
3530 EV_FREQUENT_CHECK;
3531
3532#if EV_USE_SIGNALFD
3533 if (sigfd == -2)
3534 {
3535 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3536 if (sigfd < 0 && errno == EINVAL)
3537 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3538
3539 if (sigfd >= 0)
572 { 3540 {
573 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 3541 fd_intern (sigfd); /* doing it twice will not hurt */
574 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now)); 3542
575 downheap ((WT *)periodics, periodiccnt, 0); 3543 sigemptyset (&sigfd_set);
3544
3545 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3546 ev_set_priority (&sigfd_w, EV_MAXPRI);
3547 ev_io_start (EV_A_ &sigfd_w);
3548 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3549 }
3550 }
3551
3552 if (sigfd >= 0)
3553 {
3554 /* TODO: check .head */
3555 sigaddset (&sigfd_set, w->signum);
3556 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3557
3558 signalfd (sigfd, &sigfd_set, 0);
3559 }
3560#endif
3561
3562 ev_start (EV_A_ (W)w, 1);
3563 wlist_add (&signals [w->signum - 1].head, (WL)w);
3564
3565 if (!((WL)w)->next)
3566# if EV_USE_SIGNALFD
3567 if (sigfd < 0) /*TODO*/
3568# endif
3569 {
3570# ifdef _WIN32
3571 evpipe_init (EV_A);
3572
3573 signal (w->signum, ev_sighandler);
3574# else
3575 struct sigaction sa;
3576
3577 evpipe_init (EV_A);
3578
3579 sa.sa_handler = ev_sighandler;
3580 sigfillset (&sa.sa_mask);
3581 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3582 sigaction (w->signum, &sa, 0);
3583
3584 if (origflags & EVFLAG_NOSIGMASK)
3585 {
3586 sigemptyset (&sa.sa_mask);
3587 sigaddset (&sa.sa_mask, w->signum);
3588 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3589 }
3590#endif
3591 }
3592
3593 EV_FREQUENT_CHECK;
3594}
3595
3596void noinline
3597ev_signal_stop (EV_P_ ev_signal *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 (&signals [w->signum - 1].head, (WL)w);
3606 ev_stop (EV_A_ (W)w);
3607
3608 if (!signals [w->signum - 1].head)
3609 {
3610#if EV_MULTIPLICITY
3611 signals [w->signum - 1].loop = 0; /* unattach from signal */
3612#endif
3613#if EV_USE_SIGNALFD
3614 if (sigfd >= 0)
3615 {
3616 sigset_t ss;
3617
3618 sigemptyset (&ss);
3619 sigaddset (&ss, w->signum);
3620 sigdelset (&sigfd_set, w->signum);
3621
3622 signalfd (sigfd, &sigfd_set, 0);
3623 sigprocmask (SIG_UNBLOCK, &ss, 0);
576 } 3624 }
577 else 3625 else
578 ev_periodic_stop (w); /* nonrepeating: stop timer */ 3626#endif
579 3627 signal (w->signum, SIG_DFL);
580 event ((W)w, EV_PERIODIC);
581 }
582}
583
584static void
585periodics_reschedule (ev_tstamp diff)
586{
587 int i;
588
589 /* adjust periodics after time jump */
590 for (i = 0; i < periodiccnt; ++i)
591 { 3628 }
592 struct ev_periodic *w = periodics [i];
593 3629
594 if (w->interval) 3630 EV_FREQUENT_CHECK;
3631}
3632
3633#endif
3634
3635#if EV_CHILD_ENABLE
3636
3637void
3638ev_child_start (EV_P_ ev_child *w) EV_THROW
3639{
3640#if EV_MULTIPLICITY
3641 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3642#endif
3643 if (expect_false (ev_is_active (w)))
3644 return;
3645
3646 EV_FREQUENT_CHECK;
3647
3648 ev_start (EV_A_ (W)w, 1);
3649 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3650
3651 EV_FREQUENT_CHECK;
3652}
3653
3654void
3655ev_child_stop (EV_P_ ev_child *w) EV_THROW
3656{
3657 clear_pending (EV_A_ (W)w);
3658 if (expect_false (!ev_is_active (w)))
3659 return;
3660
3661 EV_FREQUENT_CHECK;
3662
3663 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3664 ev_stop (EV_A_ (W)w);
3665
3666 EV_FREQUENT_CHECK;
3667}
3668
3669#endif
3670
3671#if EV_STAT_ENABLE
3672
3673# ifdef _WIN32
3674# undef lstat
3675# define lstat(a,b) _stati64 (a,b)
3676# endif
3677
3678#define DEF_STAT_INTERVAL 5.0074891
3679#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3680#define MIN_STAT_INTERVAL 0.1074891
3681
3682static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3683
3684#if EV_USE_INOTIFY
3685
3686/* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3687# define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3688
3689static void noinline
3690infy_add (EV_P_ ev_stat *w)
3691{
3692 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);
3693
3694 if (w->wd >= 0)
3695 {
3696 struct statfs sfs;
3697
3698 /* now local changes will be tracked by inotify, but remote changes won't */
3699 /* unless the filesystem is known to be local, we therefore still poll */
3700 /* also do poll on <2.6.25, but with normal frequency */
3701
3702 if (!fs_2625)
3703 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3704 else if (!statfs (w->path, &sfs)
3705 && (sfs.f_type == 0x1373 /* devfs */
3706 || sfs.f_type == 0xEF53 /* ext2/3 */
3707 || sfs.f_type == 0x3153464a /* jfs */
3708 || sfs.f_type == 0x52654973 /* reiser3 */
3709 || sfs.f_type == 0x01021994 /* tempfs */
3710 || sfs.f_type == 0x58465342 /* xfs */))
3711 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3712 else
3713 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3714 }
3715 else
3716 {
3717 /* can't use inotify, continue to stat */
3718 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3719
3720 /* if path is not there, monitor some parent directory for speedup hints */
3721 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3722 /* but an efficiency issue only */
3723 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
595 { 3724 {
596 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 3725 char path [4096];
3726 strcpy (path, w->path);
597 3727
598 if (fabs (diff) >= 1e-4) 3728 do
599 { 3729 {
600 ev_periodic_stop (w); 3730 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
601 ev_periodic_start (w); 3731 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
602 3732
603 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 3733 char *pend = strrchr (path, '/');
3734
3735 if (!pend || pend == path)
3736 break;
3737
3738 *pend = 0;
3739 w->wd = inotify_add_watch (fs_fd, path, mask);
3740 }
3741 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3742 }
3743 }
3744
3745 if (w->wd >= 0)
3746 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3747
3748 /* now re-arm timer, if required */
3749 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3750 ev_timer_again (EV_A_ &w->timer);
3751 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3752}
3753
3754static void noinline
3755infy_del (EV_P_ ev_stat *w)
3756{
3757 int slot;
3758 int wd = w->wd;
3759
3760 if (wd < 0)
3761 return;
3762
3763 w->wd = -2;
3764 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3765 wlist_del (&fs_hash [slot].head, (WL)w);
3766
3767 /* remove this watcher, if others are watching it, they will rearm */
3768 inotify_rm_watch (fs_fd, wd);
3769}
3770
3771static void noinline
3772infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3773{
3774 if (slot < 0)
3775 /* overflow, need to check for all hash slots */
3776 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3777 infy_wd (EV_A_ slot, wd, ev);
3778 else
3779 {
3780 WL w_;
3781
3782 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3783 {
3784 ev_stat *w = (ev_stat *)w_;
3785 w_ = w_->next; /* lets us remove this watcher and all before it */
3786
3787 if (w->wd == wd || wd == -1)
3788 {
3789 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3790 {
3791 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3792 w->wd = -1;
3793 infy_add (EV_A_ w); /* re-add, no matter what */
3794 }
3795
3796 stat_timer_cb (EV_A_ &w->timer, 0);
604 } 3797 }
605 } 3798 }
606 } 3799 }
607} 3800}
608 3801
609static void 3802static void
610time_update (void) 3803infy_cb (EV_P_ ev_io *w, int revents)
611{ 3804{
3805 char buf [EV_INOTIFY_BUFSIZE];
612 int i; 3806 int ofs;
3807 int len = read (fs_fd, buf, sizeof (buf));
613 3808
614 ev_now = ev_time (); 3809 for (ofs = 0; ofs < len; )
615 3810 {
616 if (have_monotonic) 3811 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3812 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3813 ofs += sizeof (struct inotify_event) + ev->len;
617 { 3814 }
618 ev_tstamp odiff = diff; 3815}
619 3816
620 for (i = 4; --i; ) /* loop a few times, before making important decisions */ 3817inline_size void ecb_cold
3818ev_check_2625 (EV_P)
3819{
3820 /* kernels < 2.6.25 are borked
3821 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3822 */
3823 if (ev_linux_version () < 0x020619)
3824 return;
3825
3826 fs_2625 = 1;
3827}
3828
3829inline_size int
3830infy_newfd (void)
3831{
3832#if defined IN_CLOEXEC && defined IN_NONBLOCK
3833 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3834 if (fd >= 0)
3835 return fd;
3836#endif
3837 return inotify_init ();
3838}
3839
3840inline_size void
3841infy_init (EV_P)
3842{
3843 if (fs_fd != -2)
3844 return;
3845
3846 fs_fd = -1;
3847
3848 ev_check_2625 (EV_A);
3849
3850 fs_fd = infy_newfd ();
3851
3852 if (fs_fd >= 0)
3853 {
3854 fd_intern (fs_fd);
3855 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3856 ev_set_priority (&fs_w, EV_MAXPRI);
3857 ev_io_start (EV_A_ &fs_w);
3858 ev_unref (EV_A);
3859 }
3860}
3861
3862inline_size void
3863infy_fork (EV_P)
3864{
3865 int slot;
3866
3867 if (fs_fd < 0)
3868 return;
3869
3870 ev_ref (EV_A);
3871 ev_io_stop (EV_A_ &fs_w);
3872 close (fs_fd);
3873 fs_fd = infy_newfd ();
3874
3875 if (fs_fd >= 0)
3876 {
3877 fd_intern (fs_fd);
3878 ev_io_set (&fs_w, fs_fd, EV_READ);
3879 ev_io_start (EV_A_ &fs_w);
3880 ev_unref (EV_A);
3881 }
3882
3883 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3884 {
3885 WL w_ = fs_hash [slot].head;
3886 fs_hash [slot].head = 0;
3887
3888 while (w_)
621 { 3889 {
622 now = get_clock (); 3890 ev_stat *w = (ev_stat *)w_;
623 diff = ev_now - now; 3891 w_ = w_->next; /* lets us add this watcher */
624 3892
625 if (fabs (odiff - diff) < MIN_TIMEJUMP) 3893 w->wd = -1;
626 return; /* all is well */
627 3894
628 ev_now = ev_time (); 3895 if (fs_fd >= 0)
3896 infy_add (EV_A_ w); /* re-add, no matter what */
3897 else
3898 {
3899 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3900 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3901 ev_timer_again (EV_A_ &w->timer);
3902 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3903 }
629 } 3904 }
630
631 periodics_reschedule (diff - odiff);
632 /* no timer adjustment, as the monotonic clock doesn't jump */
633 } 3905 }
3906}
3907
3908#endif
3909
3910#ifdef _WIN32
3911# define EV_LSTAT(p,b) _stati64 (p, b)
3912#else
3913# define EV_LSTAT(p,b) lstat (p, b)
3914#endif
3915
3916void
3917ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
3918{
3919 if (lstat (w->path, &w->attr) < 0)
3920 w->attr.st_nlink = 0;
3921 else if (!w->attr.st_nlink)
3922 w->attr.st_nlink = 1;
3923}
3924
3925static void noinline
3926stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3927{
3928 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3929
3930 ev_statdata prev = w->attr;
3931 ev_stat_stat (EV_A_ w);
3932
3933 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3934 if (
3935 prev.st_dev != w->attr.st_dev
3936 || prev.st_ino != w->attr.st_ino
3937 || prev.st_mode != w->attr.st_mode
3938 || prev.st_nlink != w->attr.st_nlink
3939 || prev.st_uid != w->attr.st_uid
3940 || prev.st_gid != w->attr.st_gid
3941 || prev.st_rdev != w->attr.st_rdev
3942 || prev.st_size != w->attr.st_size
3943 || prev.st_atime != w->attr.st_atime
3944 || prev.st_mtime != w->attr.st_mtime
3945 || prev.st_ctime != w->attr.st_ctime
3946 ) {
3947 /* we only update w->prev on actual differences */
3948 /* in case we test more often than invoke the callback, */
3949 /* to ensure that prev is always different to attr */
3950 w->prev = prev;
3951
3952 #if EV_USE_INOTIFY
3953 if (fs_fd >= 0)
3954 {
3955 infy_del (EV_A_ w);
3956 infy_add (EV_A_ w);
3957 ev_stat_stat (EV_A_ w); /* avoid race... */
3958 }
3959 #endif
3960
3961 ev_feed_event (EV_A_ w, EV_STAT);
3962 }
3963}
3964
3965void
3966ev_stat_start (EV_P_ ev_stat *w) EV_THROW
3967{
3968 if (expect_false (ev_is_active (w)))
3969 return;
3970
3971 ev_stat_stat (EV_A_ w);
3972
3973 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3974 w->interval = MIN_STAT_INTERVAL;
3975
3976 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3977 ev_set_priority (&w->timer, ev_priority (w));
3978
3979#if EV_USE_INOTIFY
3980 infy_init (EV_A);
3981
3982 if (fs_fd >= 0)
3983 infy_add (EV_A_ w);
634 else 3984 else
3985#endif
3986 {
3987 ev_timer_again (EV_A_ &w->timer);
3988 ev_unref (EV_A);
635 { 3989 }
636 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) 3990
3991 ev_start (EV_A_ (W)w, 1);
3992
3993 EV_FREQUENT_CHECK;
3994}
3995
3996void
3997ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
3998{
3999 clear_pending (EV_A_ (W)w);
4000 if (expect_false (!ev_is_active (w)))
4001 return;
4002
4003 EV_FREQUENT_CHECK;
4004
4005#if EV_USE_INOTIFY
4006 infy_del (EV_A_ w);
4007#endif
4008
4009 if (ev_is_active (&w->timer))
4010 {
4011 ev_ref (EV_A);
4012 ev_timer_stop (EV_A_ &w->timer);
4013 }
4014
4015 ev_stop (EV_A_ (W)w);
4016
4017 EV_FREQUENT_CHECK;
4018}
4019#endif
4020
4021#if EV_IDLE_ENABLE
4022void
4023ev_idle_start (EV_P_ ev_idle *w) EV_THROW
4024{
4025 if (expect_false (ev_is_active (w)))
4026 return;
4027
4028 pri_adjust (EV_A_ (W)w);
4029
4030 EV_FREQUENT_CHECK;
4031
4032 {
4033 int active = ++idlecnt [ABSPRI (w)];
4034
4035 ++idleall;
4036 ev_start (EV_A_ (W)w, active);
4037
4038 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
4039 idles [ABSPRI (w)][active - 1] = w;
4040 }
4041
4042 EV_FREQUENT_CHECK;
4043}
4044
4045void
4046ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
4047{
4048 clear_pending (EV_A_ (W)w);
4049 if (expect_false (!ev_is_active (w)))
4050 return;
4051
4052 EV_FREQUENT_CHECK;
4053
4054 {
4055 int active = ev_active (w);
4056
4057 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
4058 ev_active (idles [ABSPRI (w)][active - 1]) = active;
4059
4060 ev_stop (EV_A_ (W)w);
4061 --idleall;
4062 }
4063
4064 EV_FREQUENT_CHECK;
4065}
4066#endif
4067
4068#if EV_PREPARE_ENABLE
4069void
4070ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
4071{
4072 if (expect_false (ev_is_active (w)))
4073 return;
4074
4075 EV_FREQUENT_CHECK;
4076
4077 ev_start (EV_A_ (W)w, ++preparecnt);
4078 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
4079 prepares [preparecnt - 1] = w;
4080
4081 EV_FREQUENT_CHECK;
4082}
4083
4084void
4085ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
4086{
4087 clear_pending (EV_A_ (W)w);
4088 if (expect_false (!ev_is_active (w)))
4089 return;
4090
4091 EV_FREQUENT_CHECK;
4092
4093 {
4094 int active = ev_active (w);
4095
4096 prepares [active - 1] = prepares [--preparecnt];
4097 ev_active (prepares [active - 1]) = active;
4098 }
4099
4100 ev_stop (EV_A_ (W)w);
4101
4102 EV_FREQUENT_CHECK;
4103}
4104#endif
4105
4106#if EV_CHECK_ENABLE
4107void
4108ev_check_start (EV_P_ ev_check *w) EV_THROW
4109{
4110 if (expect_false (ev_is_active (w)))
4111 return;
4112
4113 EV_FREQUENT_CHECK;
4114
4115 ev_start (EV_A_ (W)w, ++checkcnt);
4116 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4117 checks [checkcnt - 1] = w;
4118
4119 EV_FREQUENT_CHECK;
4120}
4121
4122void
4123ev_check_stop (EV_P_ ev_check *w) EV_THROW
4124{
4125 clear_pending (EV_A_ (W)w);
4126 if (expect_false (!ev_is_active (w)))
4127 return;
4128
4129 EV_FREQUENT_CHECK;
4130
4131 {
4132 int active = ev_active (w);
4133
4134 checks [active - 1] = checks [--checkcnt];
4135 ev_active (checks [active - 1]) = active;
4136 }
4137
4138 ev_stop (EV_A_ (W)w);
4139
4140 EV_FREQUENT_CHECK;
4141}
4142#endif
4143
4144#if EV_EMBED_ENABLE
4145void noinline
4146ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
4147{
4148 ev_run (w->other, EVRUN_NOWAIT);
4149}
4150
4151static void
4152embed_io_cb (EV_P_ ev_io *io, int revents)
4153{
4154 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4155
4156 if (ev_cb (w))
4157 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4158 else
4159 ev_run (w->other, EVRUN_NOWAIT);
4160}
4161
4162static void
4163embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4164{
4165 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4166
4167 {
4168 EV_P = w->other;
4169
4170 while (fdchangecnt)
637 { 4171 {
638 periodics_reschedule (ev_now - now); 4172 fd_reify (EV_A);
639 4173 ev_run (EV_A_ EVRUN_NOWAIT);
640 /* adjust timers. this is easy, as the offset is the same for all */
641 for (i = 0; i < timercnt; ++i)
642 timers [i]->at += diff;
643 } 4174 }
644
645 now = ev_now;
646 } 4175 }
647} 4176}
648 4177
649int ev_loop_done; 4178static void
650 4179embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
651void ev_loop (int flags)
652{ 4180{
653 double block; 4181 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
654 ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
655 4182
656 do 4183 ev_embed_stop (EV_A_ w);
4184
657 { 4185 {
658 /* queue check watchers (and execute them) */ 4186 EV_P = w->other;
659 if (preparecnt)
660 {
661 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
662 call_pending ();
663 }
664 4187
665 /* update fd-related kernel structures */ 4188 ev_loop_fork (EV_A);
666 fd_reify (); 4189 ev_run (EV_A_ EVRUN_NOWAIT);
667
668 /* calculate blocking time */
669
670 /* we only need this for !monotonic clockor timers, but as we basically
671 always have timers, we just calculate it always */
672 ev_now = ev_time ();
673
674 if (flags & EVLOOP_NONBLOCK || idlecnt)
675 block = 0.;
676 else
677 {
678 block = MAX_BLOCKTIME;
679
680 if (timercnt)
681 {
682 ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
683 if (block > to) block = to;
684 }
685
686 if (periodiccnt)
687 {
688 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
689 if (block > to) block = to;
690 }
691
692 if (block < 0.) block = 0.;
693 }
694
695 method_poll (block);
696
697 /* update ev_now, do magic */
698 time_update ();
699
700 /* queue pending timers and reschedule them */
701 timers_reify (); /* relative timers called last */
702 periodics_reify (); /* absolute timers called first */
703
704 /* queue idle watchers unless io or timers are pending */
705 if (!pendingcnt)
706 queue_events ((W *)idles, idlecnt, EV_IDLE);
707
708 /* queue check watchers, to be executed first */
709 if (checkcnt)
710 queue_events ((W *)checks, checkcnt, EV_CHECK);
711
712 call_pending ();
713 } 4190 }
714 while (!ev_loop_done);
715 4191
716 if (ev_loop_done != 2) 4192 ev_embed_start (EV_A_ w);
717 ev_loop_done = 0;
718} 4193}
4194
4195#if 0
4196static void
4197embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4198{
4199 ev_idle_stop (EV_A_ idle);
4200}
4201#endif
4202
4203void
4204ev_embed_start (EV_P_ ev_embed *w) EV_THROW
4205{
4206 if (expect_false (ev_is_active (w)))
4207 return;
4208
4209 {
4210 EV_P = w->other;
4211 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4212 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4213 }
4214
4215 EV_FREQUENT_CHECK;
4216
4217 ev_set_priority (&w->io, ev_priority (w));
4218 ev_io_start (EV_A_ &w->io);
4219
4220 ev_prepare_init (&w->prepare, embed_prepare_cb);
4221 ev_set_priority (&w->prepare, EV_MINPRI);
4222 ev_prepare_start (EV_A_ &w->prepare);
4223
4224 ev_fork_init (&w->fork, embed_fork_cb);
4225 ev_fork_start (EV_A_ &w->fork);
4226
4227 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4228
4229 ev_start (EV_A_ (W)w, 1);
4230
4231 EV_FREQUENT_CHECK;
4232}
4233
4234void
4235ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
4236{
4237 clear_pending (EV_A_ (W)w);
4238 if (expect_false (!ev_is_active (w)))
4239 return;
4240
4241 EV_FREQUENT_CHECK;
4242
4243 ev_io_stop (EV_A_ &w->io);
4244 ev_prepare_stop (EV_A_ &w->prepare);
4245 ev_fork_stop (EV_A_ &w->fork);
4246
4247 ev_stop (EV_A_ (W)w);
4248
4249 EV_FREQUENT_CHECK;
4250}
4251#endif
4252
4253#if EV_FORK_ENABLE
4254void
4255ev_fork_start (EV_P_ ev_fork *w) EV_THROW
4256{
4257 if (expect_false (ev_is_active (w)))
4258 return;
4259
4260 EV_FREQUENT_CHECK;
4261
4262 ev_start (EV_A_ (W)w, ++forkcnt);
4263 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4264 forks [forkcnt - 1] = w;
4265
4266 EV_FREQUENT_CHECK;
4267}
4268
4269void
4270ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
4271{
4272 clear_pending (EV_A_ (W)w);
4273 if (expect_false (!ev_is_active (w)))
4274 return;
4275
4276 EV_FREQUENT_CHECK;
4277
4278 {
4279 int active = ev_active (w);
4280
4281 forks [active - 1] = forks [--forkcnt];
4282 ev_active (forks [active - 1]) = active;
4283 }
4284
4285 ev_stop (EV_A_ (W)w);
4286
4287 EV_FREQUENT_CHECK;
4288}
4289#endif
4290
4291#if EV_CLEANUP_ENABLE
4292void
4293ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
4294{
4295 if (expect_false (ev_is_active (w)))
4296 return;
4297
4298 EV_FREQUENT_CHECK;
4299
4300 ev_start (EV_A_ (W)w, ++cleanupcnt);
4301 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4302 cleanups [cleanupcnt - 1] = w;
4303
4304 /* cleanup watchers should never keep a refcount on the loop */
4305 ev_unref (EV_A);
4306 EV_FREQUENT_CHECK;
4307}
4308
4309void
4310ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
4311{
4312 clear_pending (EV_A_ (W)w);
4313 if (expect_false (!ev_is_active (w)))
4314 return;
4315
4316 EV_FREQUENT_CHECK;
4317 ev_ref (EV_A);
4318
4319 {
4320 int active = ev_active (w);
4321
4322 cleanups [active - 1] = cleanups [--cleanupcnt];
4323 ev_active (cleanups [active - 1]) = active;
4324 }
4325
4326 ev_stop (EV_A_ (W)w);
4327
4328 EV_FREQUENT_CHECK;
4329}
4330#endif
4331
4332#if EV_ASYNC_ENABLE
4333void
4334ev_async_start (EV_P_ ev_async *w) EV_THROW
4335{
4336 if (expect_false (ev_is_active (w)))
4337 return;
4338
4339 w->sent = 0;
4340
4341 evpipe_init (EV_A);
4342
4343 EV_FREQUENT_CHECK;
4344
4345 ev_start (EV_A_ (W)w, ++asynccnt);
4346 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4347 asyncs [asynccnt - 1] = w;
4348
4349 EV_FREQUENT_CHECK;
4350}
4351
4352void
4353ev_async_stop (EV_P_ ev_async *w) EV_THROW
4354{
4355 clear_pending (EV_A_ (W)w);
4356 if (expect_false (!ev_is_active (w)))
4357 return;
4358
4359 EV_FREQUENT_CHECK;
4360
4361 {
4362 int active = ev_active (w);
4363
4364 asyncs [active - 1] = asyncs [--asynccnt];
4365 ev_active (asyncs [active - 1]) = active;
4366 }
4367
4368 ev_stop (EV_A_ (W)w);
4369
4370 EV_FREQUENT_CHECK;
4371}
4372
4373void
4374ev_async_send (EV_P_ ev_async *w) EV_THROW
4375{
4376 w->sent = 1;
4377 evpipe_write (EV_A_ &async_pending);
4378}
4379#endif
719 4380
720/*****************************************************************************/ 4381/*****************************************************************************/
721 4382
722static void
723wlist_add (WL *head, WL elem)
724{
725 elem->next = *head;
726 *head = elem;
727}
728
729static void
730wlist_del (WL *head, WL elem)
731{
732 while (*head)
733 {
734 if (*head == elem)
735 {
736 *head = elem->next;
737 return;
738 }
739
740 head = &(*head)->next;
741 }
742}
743
744static void
745ev_clear_pending (W w)
746{
747 if (w->pending)
748 {
749 pendings [w->pending - 1].w = 0;
750 w->pending = 0;
751 }
752}
753
754static void
755ev_start (W w, int active)
756{
757 w->active = active;
758}
759
760static void
761ev_stop (W w)
762{
763 w->active = 0;
764}
765
766/*****************************************************************************/
767
768void
769ev_io_start (struct ev_io *w)
770{
771 int fd = w->fd;
772
773 if (ev_is_active (w))
774 return;
775
776 assert (("ev_io_start called with negative fd", fd >= 0));
777
778 ev_start ((W)w, 1);
779 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
780 wlist_add ((WL *)&anfds[fd].head, (WL)w);
781
782 fd_change (fd);
783}
784
785void
786ev_io_stop (struct ev_io *w)
787{
788 ev_clear_pending ((W)w);
789 if (!ev_is_active (w))
790 return;
791
792 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
793 ev_stop ((W)w);
794
795 fd_change (w->fd);
796}
797
798void
799ev_timer_start (struct ev_timer *w)
800{
801 if (ev_is_active (w))
802 return;
803
804 w->at += now;
805
806 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
807
808 ev_start ((W)w, ++timercnt);
809 array_needsize (timers, timermax, timercnt, );
810 timers [timercnt - 1] = w;
811 upheap ((WT *)timers, timercnt - 1);
812}
813
814void
815ev_timer_stop (struct ev_timer *w)
816{
817 ev_clear_pending ((W)w);
818 if (!ev_is_active (w))
819 return;
820
821 if (w->active < timercnt--)
822 {
823 timers [w->active - 1] = timers [timercnt];
824 downheap ((WT *)timers, timercnt, w->active - 1);
825 }
826
827 w->at = w->repeat;
828
829 ev_stop ((W)w);
830}
831
832void
833ev_timer_again (struct ev_timer *w)
834{
835 if (ev_is_active (w))
836 {
837 if (w->repeat)
838 {
839 w->at = now + w->repeat;
840 downheap ((WT *)timers, timercnt, w->active - 1);
841 }
842 else
843 ev_timer_stop (w);
844 }
845 else if (w->repeat)
846 ev_timer_start (w);
847}
848
849void
850ev_periodic_start (struct ev_periodic *w)
851{
852 if (ev_is_active (w))
853 return;
854
855 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
856
857 /* this formula differs from the one in periodic_reify because we do not always round up */
858 if (w->interval)
859 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
860
861 ev_start ((W)w, ++periodiccnt);
862 array_needsize (periodics, periodicmax, periodiccnt, );
863 periodics [periodiccnt - 1] = w;
864 upheap ((WT *)periodics, periodiccnt - 1);
865}
866
867void
868ev_periodic_stop (struct ev_periodic *w)
869{
870 ev_clear_pending ((W)w);
871 if (!ev_is_active (w))
872 return;
873
874 if (w->active < periodiccnt--)
875 {
876 periodics [w->active - 1] = periodics [periodiccnt];
877 downheap ((WT *)periodics, periodiccnt, w->active - 1);
878 }
879
880 ev_stop ((W)w);
881}
882
883void
884ev_signal_start (struct ev_signal *w)
885{
886 if (ev_is_active (w))
887 return;
888
889 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
890
891 ev_start ((W)w, 1);
892 array_needsize (signals, signalmax, w->signum, signals_init);
893 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
894
895 if (!w->next)
896 {
897 struct sigaction sa;
898 sa.sa_handler = sighandler;
899 sigfillset (&sa.sa_mask);
900 sa.sa_flags = 0;
901 sigaction (w->signum, &sa, 0);
902 }
903}
904
905void
906ev_signal_stop (struct ev_signal *w)
907{
908 ev_clear_pending ((W)w);
909 if (!ev_is_active (w))
910 return;
911
912 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
913 ev_stop ((W)w);
914
915 if (!signals [w->signum - 1].head)
916 signal (w->signum, SIG_DFL);
917}
918
919void
920ev_idle_start (struct ev_idle *w)
921{
922 if (ev_is_active (w))
923 return;
924
925 ev_start ((W)w, ++idlecnt);
926 array_needsize (idles, idlemax, idlecnt, );
927 idles [idlecnt - 1] = w;
928}
929
930void
931ev_idle_stop (struct ev_idle *w)
932{
933 ev_clear_pending ((W)w);
934 if (ev_is_active (w))
935 return;
936
937 idles [w->active - 1] = idles [--idlecnt];
938 ev_stop ((W)w);
939}
940
941void
942ev_prepare_start (struct ev_prepare *w)
943{
944 if (ev_is_active (w))
945 return;
946
947 ev_start ((W)w, ++preparecnt);
948 array_needsize (prepares, preparemax, preparecnt, );
949 prepares [preparecnt - 1] = w;
950}
951
952void
953ev_prepare_stop (struct ev_prepare *w)
954{
955 ev_clear_pending ((W)w);
956 if (ev_is_active (w))
957 return;
958
959 prepares [w->active - 1] = prepares [--preparecnt];
960 ev_stop ((W)w);
961}
962
963void
964ev_check_start (struct ev_check *w)
965{
966 if (ev_is_active (w))
967 return;
968
969 ev_start ((W)w, ++checkcnt);
970 array_needsize (checks, checkmax, checkcnt, );
971 checks [checkcnt - 1] = w;
972}
973
974void
975ev_check_stop (struct ev_check *w)
976{
977 ev_clear_pending ((W)w);
978 if (ev_is_active (w))
979 return;
980
981 checks [w->active - 1] = checks [--checkcnt];
982 ev_stop ((W)w);
983}
984
985void
986ev_child_start (struct ev_child *w)
987{
988 if (ev_is_active (w))
989 return;
990
991 ev_start ((W)w, 1);
992 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
993}
994
995void
996ev_child_stop (struct ev_child *w)
997{
998 ev_clear_pending ((W)w);
999 if (ev_is_active (w))
1000 return;
1001
1002 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1003 ev_stop ((W)w);
1004}
1005
1006/*****************************************************************************/
1007
1008struct ev_once 4383struct ev_once
1009{ 4384{
1010 struct ev_io io; 4385 ev_io io;
1011 struct ev_timer to; 4386 ev_timer to;
1012 void (*cb)(int revents, void *arg); 4387 void (*cb)(int revents, void *arg);
1013 void *arg; 4388 void *arg;
1014}; 4389};
1015 4390
1016static void 4391static void
1017once_cb (struct ev_once *once, int revents) 4392once_cb (EV_P_ struct ev_once *once, int revents)
1018{ 4393{
1019 void (*cb)(int revents, void *arg) = once->cb; 4394 void (*cb)(int revents, void *arg) = once->cb;
1020 void *arg = once->arg; 4395 void *arg = once->arg;
1021 4396
1022 ev_io_stop (&once->io); 4397 ev_io_stop (EV_A_ &once->io);
1023 ev_timer_stop (&once->to); 4398 ev_timer_stop (EV_A_ &once->to);
1024 free (once); 4399 ev_free (once);
1025 4400
1026 cb (revents, arg); 4401 cb (revents, arg);
1027} 4402}
1028 4403
1029static void 4404static void
1030once_cb_io (struct ev_io *w, int revents) 4405once_cb_io (EV_P_ ev_io *w, int revents)
1031{ 4406{
1032 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents); 4407 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4408
4409 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
1033} 4410}
1034 4411
1035static void 4412static void
1036once_cb_to (struct ev_timer *w, int revents) 4413once_cb_to (EV_P_ ev_timer *w, int revents)
1037{ 4414{
1038 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents); 4415 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4416
4417 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
1039} 4418}
1040 4419
1041void 4420void
1042ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) 4421ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
1043{ 4422{
1044 struct ev_once *once = malloc (sizeof (struct ev_once)); 4423 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
1045 4424
1046 if (!once) 4425 if (expect_false (!once))
4426 {
1047 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg); 4427 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
1048 else 4428 return;
1049 { 4429 }
4430
1050 once->cb = cb; 4431 once->cb = cb;
1051 once->arg = arg; 4432 once->arg = arg;
1052 4433
1053 ev_watcher_init (&once->io, once_cb_io); 4434 ev_init (&once->io, once_cb_io);
1054 if (fd >= 0) 4435 if (fd >= 0)
4436 {
4437 ev_io_set (&once->io, fd, events);
4438 ev_io_start (EV_A_ &once->io);
4439 }
4440
4441 ev_init (&once->to, once_cb_to);
4442 if (timeout >= 0.)
4443 {
4444 ev_timer_set (&once->to, timeout, 0.);
4445 ev_timer_start (EV_A_ &once->to);
4446 }
4447}
4448
4449/*****************************************************************************/
4450
4451#if EV_WALK_ENABLE
4452void ecb_cold
4453ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
4454{
4455 int i, j;
4456 ev_watcher_list *wl, *wn;
4457
4458 if (types & (EV_IO | EV_EMBED))
4459 for (i = 0; i < anfdmax; ++i)
4460 for (wl = anfds [i].head; wl; )
1055 { 4461 {
1056 ev_io_set (&once->io, fd, events); 4462 wn = wl->next;
1057 ev_io_start (&once->io); 4463
4464#if EV_EMBED_ENABLE
4465 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4466 {
4467 if (types & EV_EMBED)
4468 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4469 }
4470 else
4471#endif
4472#if EV_USE_INOTIFY
4473 if (ev_cb ((ev_io *)wl) == infy_cb)
4474 ;
4475 else
4476#endif
4477 if ((ev_io *)wl != &pipe_w)
4478 if (types & EV_IO)
4479 cb (EV_A_ EV_IO, wl);
4480
4481 wl = wn;
1058 } 4482 }
1059 4483
1060 ev_watcher_init (&once->to, once_cb_to); 4484 if (types & (EV_TIMER | EV_STAT))
1061 if (timeout >= 0.) 4485 for (i = timercnt + HEAP0; i-- > HEAP0; )
4486#if EV_STAT_ENABLE
4487 /*TODO: timer is not always active*/
4488 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
1062 { 4489 {
1063 ev_timer_set (&once->to, timeout, 0.); 4490 if (types & EV_STAT)
1064 ev_timer_start (&once->to); 4491 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
1065 } 4492 }
1066 } 4493 else
1067} 4494#endif
4495 if (types & EV_TIMER)
4496 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
1068 4497
1069/*****************************************************************************/ 4498#if EV_PERIODIC_ENABLE
4499 if (types & EV_PERIODIC)
4500 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4501 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4502#endif
1070 4503
1071#if 0 4504#if EV_IDLE_ENABLE
4505 if (types & EV_IDLE)
4506 for (j = NUMPRI; j--; )
4507 for (i = idlecnt [j]; i--; )
4508 cb (EV_A_ EV_IDLE, idles [j][i]);
4509#endif
1072 4510
1073struct ev_io wio; 4511#if EV_FORK_ENABLE
4512 if (types & EV_FORK)
4513 for (i = forkcnt; i--; )
4514 if (ev_cb (forks [i]) != embed_fork_cb)
4515 cb (EV_A_ EV_FORK, forks [i]);
4516#endif
1074 4517
1075static void 4518#if EV_ASYNC_ENABLE
1076sin_cb (struct ev_io *w, int revents) 4519 if (types & EV_ASYNC)
1077{ 4520 for (i = asynccnt; i--; )
1078 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); 4521 cb (EV_A_ EV_ASYNC, asyncs [i]);
1079} 4522#endif
1080 4523
1081static void 4524#if EV_PREPARE_ENABLE
1082ocb (struct ev_timer *w, int revents) 4525 if (types & EV_PREPARE)
1083{ 4526 for (i = preparecnt; i--; )
1084 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); 4527# if EV_EMBED_ENABLE
1085 ev_timer_stop (w); 4528 if (ev_cb (prepares [i]) != embed_prepare_cb)
1086 ev_timer_start (w);
1087}
1088
1089static void
1090scb (struct ev_signal *w, int revents)
1091{
1092 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
1093 ev_io_stop (&wio);
1094 ev_io_start (&wio);
1095}
1096
1097static void
1098gcb (struct ev_signal *w, int revents)
1099{
1100 fprintf (stderr, "generic %x\n", revents);
1101
1102}
1103
1104int main (void)
1105{
1106 ev_init (0);
1107
1108 ev_io_init (&wio, sin_cb, 0, EV_READ);
1109 ev_io_start (&wio);
1110
1111 struct ev_timer t[10000];
1112
1113#if 0
1114 int i;
1115 for (i = 0; i < 10000; ++i)
1116 {
1117 struct ev_timer *w = t + i;
1118 ev_watcher_init (w, ocb, i);
1119 ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
1120 ev_timer_start (w);
1121 if (drand48 () < 0.5)
1122 ev_timer_stop (w);
1123 }
1124#endif 4529# endif
1125 4530 cb (EV_A_ EV_PREPARE, prepares [i]);
1126 struct ev_timer t1;
1127 ev_timer_init (&t1, ocb, 5, 10);
1128 ev_timer_start (&t1);
1129
1130 struct ev_signal sig;
1131 ev_signal_init (&sig, scb, SIGQUIT);
1132 ev_signal_start (&sig);
1133
1134 struct ev_check cw;
1135 ev_check_init (&cw, gcb);
1136 ev_check_start (&cw);
1137
1138 struct ev_idle iw;
1139 ev_idle_init (&iw, gcb);
1140 ev_idle_start (&iw);
1141
1142 ev_loop (0);
1143
1144 return 0;
1145}
1146
1147#endif 4531#endif
1148 4532
4533#if EV_CHECK_ENABLE
4534 if (types & EV_CHECK)
4535 for (i = checkcnt; i--; )
4536 cb (EV_A_ EV_CHECK, checks [i]);
4537#endif
1149 4538
4539#if EV_SIGNAL_ENABLE
4540 if (types & EV_SIGNAL)
4541 for (i = 0; i < EV_NSIG - 1; ++i)
4542 for (wl = signals [i].head; wl; )
4543 {
4544 wn = wl->next;
4545 cb (EV_A_ EV_SIGNAL, wl);
4546 wl = wn;
4547 }
4548#endif
1150 4549
4550#if EV_CHILD_ENABLE
4551 if (types & EV_CHILD)
4552 for (i = (EV_PID_HASHSIZE); i--; )
4553 for (wl = childs [i]; wl; )
4554 {
4555 wn = wl->next;
4556 cb (EV_A_ EV_CHILD, wl);
4557 wl = wn;
4558 }
4559#endif
4560/* EV_STAT 0x00001000 /* stat data changed */
4561/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4562}
4563#endif
1151 4564
4565#if EV_MULTIPLICITY
4566 #include "ev_wrap.h"
4567#endif
4568

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