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Comparing libev/ev.c (file contents):
Revision 1.26 by root, Wed Oct 31 21:50:15 2007 UTC vs.
Revision 1.447 by root, Tue Jun 19 12:29:43 2012 UTC

1/* 1/*
2 * libev event processing core, watcher management
3 *
2 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann <libev@schmorp.de>
3 * All rights reserved. 5 * All rights reserved.
4 * 6 *
5 * Redistribution and use in source and binary forms, with or without 7 * Redistribution and use in source and binary forms, with or without modifica-
6 * modification, are permitted provided that the following conditions are 8 * tion, are permitted provided that the following conditions are met:
7 * met:
8 * 9 *
9 * * Redistributions of source code must retain the above copyright 10 * 1. Redistributions of source code must retain the above copyright notice,
10 * notice, this list of conditions and the following disclaimer. 11 * this list of conditions and the following disclaimer.
11 * 12 *
12 * * Redistributions in binary form must reproduce the above 13 * 2. Redistributions in binary form must reproduce the above copyright
13 * copyright notice, this list of conditions and the following 14 * notice, this list of conditions and the following disclaimer in the
14 * disclaimer in the documentation and/or other materials provided 15 * documentation and/or other materials provided with the distribution.
15 * with the distribution.
16 * 16 *
17 * 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
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26 * (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
27 * 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.
28 */ 38 */
29 39
30#include <math.h> 40/* this big block deduces configuration from config.h */
41#ifndef EV_STANDALONE
42# ifdef EV_CONFIG_H
43# include EV_CONFIG_H
44# else
45# include "config.h"
46# endif
47
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
31#include <stdlib.h> 167#include <stdlib.h>
32#include <unistd.h> 168#include <string.h>
33#include <fcntl.h> 169#include <fcntl.h>
34#include <signal.h>
35#include <stddef.h> 170#include <stddef.h>
36 171
37#include <stdio.h> 172#include <stdio.h>
38 173
39#include <assert.h> 174#include <assert.h>
40#include <errno.h> 175#include <errno.h>
41#include <sys/types.h> 176#include <sys/types.h>
42#include <sys/wait.h>
43#include <sys/time.h>
44#include <time.h> 177#include <time.h>
178#include <limits.h>
45 179
46#ifndef HAVE_MONOTONIC 180#include <signal.h>
47# ifdef CLOCK_MONOTONIC 181
48# define HAVE_MONOTONIC 1 182#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
49# endif 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
50#endif 261# endif
262#endif
51 263
52#ifndef HAVE_SELECT 264#ifndef EV_USE_MONOTONIC
53# define HAVE_SELECT 1 265# 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
54#endif 269# endif
270#endif
55 271
56#ifndef HAVE_EPOLL 272#ifndef EV_USE_REALTIME
57# define HAVE_EPOLL 0 273# 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
58#endif 281# endif
282#endif
59 283
60#ifndef HAVE_REALTIME 284#ifndef EV_USE_SELECT
61# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ 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
62#endif 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
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
382#endif
383
384#ifndef CLOCK_MONOTONIC
385# undef EV_USE_MONOTONIC
386# define EV_USE_MONOTONIC 0
387#endif
388
389#ifndef CLOCK_REALTIME
390# undef EV_USE_REALTIME
391# define EV_USE_REALTIME 0
392#endif
393
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>
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 */
63 468
64#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) */
65#define MAX_BLOCKTIME 60. 470#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
66#define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */
67 471
68#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)
69 474
70typedef struct ev_watcher *W; 475/* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
71typedef struct ev_watcher_list *WL; 476/* ECB.H BEGIN */
72typedef 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 */
73 505
74static ev_tstamp now, diff; /* monotonic clock */ 506#ifndef ECB_H
75ev_tstamp ev_now; 507#define ECB_H
76int ev_method;
77 508
78static int have_monotonic; /* runtime */ 509/* 16 bits major, 16 bits minor */
510#define ECB_VERSION 0x00010001
79 511
80static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 512#ifdef _WIN32
81static void (*method_modify)(int fd, int oev, int nev); 513 typedef signed char int8_t;
82static 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_CPP11 (__cplusplus >= 201103L)
83 565
84/*****************************************************************************/ 566/*****************************************************************************/
85 567
568/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
569/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
570
571#if ECB_NO_THREADS
572 #define ECB_NO_SMP 1
573#endif
574
575#if ECB_NO_SMP
576 #define ECB_MEMORY_FENCE do { } while (0)
577#endif
578
579#ifndef ECB_MEMORY_FENCE
580 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
581 #if __i386 || __i386__
582 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
583 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
584 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
585 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
586 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
587 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
588 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
589 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
590 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
591 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
592 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
593 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
594 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
595 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
596 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
597 #elif __sparc || __sparc__
598 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
599 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
600 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
601 #elif defined __s390__ || defined __s390x__
602 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
603 #elif defined __mips__
604 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
605 #elif defined __alpha__
606 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
607 #elif defined __hppa__
608 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
609 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
610 #elif defined __ia64__
611 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
612 #endif
613 #endif
614#endif
615
616#ifndef ECB_MEMORY_FENCE
617 #if ECB_GCC_VERSION(4,7)
618 /* see comment below (stdatomic.h) about the C11 memory model. */
619 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
620 #elif defined __clang && __has_feature (cxx_atomic)
621 /* see comment below (stdatomic.h) about the C11 memory model. */
622 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
623 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
624 #define ECB_MEMORY_FENCE __sync_synchronize ()
625 #elif _MSC_VER >= 1400 /* VC++ 2005 */
626 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
627 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
628 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
629 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
630 #elif defined _WIN32
631 #include <WinNT.h>
632 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
633 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
634 #include <mbarrier.h>
635 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
636 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
637 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
638 #elif __xlC__
639 #define ECB_MEMORY_FENCE __sync ()
640 #endif
641#endif
642
643#ifndef ECB_MEMORY_FENCE
644 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
645 /* we assume that these memory fences work on all variables/all memory accesses, */
646 /* not just C11 atomics and atomic accesses */
647 #include <stdatomic.h>
648 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
649 /* any fence other than seq_cst, which isn't very efficient for us. */
650 /* Why that is, we don't know - either the C11 memory model is quite useless */
651 /* for most usages, or gcc and clang have a bug */
652 /* I *currently* lean towards the latter, and inefficiently implement */
653 /* all three of ecb's fences as a seq_cst fence */
654 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
655 #endif
656#endif
657
658#ifndef ECB_MEMORY_FENCE
659 #if !ECB_AVOID_PTHREADS
660 /*
661 * if you get undefined symbol references to pthread_mutex_lock,
662 * or failure to find pthread.h, then you should implement
663 * the ECB_MEMORY_FENCE operations for your cpu/compiler
664 * OR provide pthread.h and link against the posix thread library
665 * of your system.
666 */
667 #include <pthread.h>
668 #define ECB_NEEDS_PTHREADS 1
669 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
670
671 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
672 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
673 #endif
674#endif
675
676#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
677 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
678#endif
679
680#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
681 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
682#endif
683
684/*****************************************************************************/
685
686#if __cplusplus
687 #define ecb_inline static inline
688#elif ECB_GCC_VERSION(2,5)
689 #define ecb_inline static __inline__
690#elif ECB_C99
691 #define ecb_inline static inline
692#else
693 #define ecb_inline static
694#endif
695
696#if ECB_GCC_VERSION(3,3)
697 #define ecb_restrict __restrict__
698#elif ECB_C99
699 #define ecb_restrict restrict
700#else
701 #define ecb_restrict
702#endif
703
704typedef int ecb_bool;
705
706#define ECB_CONCAT_(a, b) a ## b
707#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
708#define ECB_STRINGIFY_(a) # a
709#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
710
711#define ecb_function_ ecb_inline
712
713#if ECB_GCC_VERSION(3,1)
714 #define ecb_attribute(attrlist) __attribute__(attrlist)
715 #define ecb_is_constant(expr) __builtin_constant_p (expr)
716 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
717 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
718#else
719 #define ecb_attribute(attrlist)
720 #define ecb_is_constant(expr) 0
721 #define ecb_expect(expr,value) (expr)
722 #define ecb_prefetch(addr,rw,locality)
723#endif
724
725/* no emulation for ecb_decltype */
726#if ECB_GCC_VERSION(4,5)
727 #define ecb_decltype(x) __decltype(x)
728#elif ECB_GCC_VERSION(3,0)
729 #define ecb_decltype(x) __typeof(x)
730#endif
731
732#define ecb_noinline ecb_attribute ((__noinline__))
733#define ecb_unused ecb_attribute ((__unused__))
734#define ecb_const ecb_attribute ((__const__))
735#define ecb_pure ecb_attribute ((__pure__))
736
737#if ECB_C11
738 #define ecb_noreturn _Noreturn
739#else
740 #define ecb_noreturn ecb_attribute ((__noreturn__))
741#endif
742
743#if ECB_GCC_VERSION(4,3)
744 #define ecb_artificial ecb_attribute ((__artificial__))
745 #define ecb_hot ecb_attribute ((__hot__))
746 #define ecb_cold ecb_attribute ((__cold__))
747#else
748 #define ecb_artificial
749 #define ecb_hot
750 #define ecb_cold
751#endif
752
753/* put around conditional expressions if you are very sure that the */
754/* expression is mostly true or mostly false. note that these return */
755/* booleans, not the expression. */
756#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
757#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
758/* for compatibility to the rest of the world */
759#define ecb_likely(expr) ecb_expect_true (expr)
760#define ecb_unlikely(expr) ecb_expect_false (expr)
761
762/* count trailing zero bits and count # of one bits */
763#if ECB_GCC_VERSION(3,4)
764 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
765 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
766 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
767 #define ecb_ctz32(x) __builtin_ctz (x)
768 #define ecb_ctz64(x) __builtin_ctzll (x)
769 #define ecb_popcount32(x) __builtin_popcount (x)
770 /* no popcountll */
771#else
772 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
773 ecb_function_ int
774 ecb_ctz32 (uint32_t x)
775 {
776 int r = 0;
777
778 x &= ~x + 1; /* this isolates the lowest bit */
779
780#if ECB_branchless_on_i386
781 r += !!(x & 0xaaaaaaaa) << 0;
782 r += !!(x & 0xcccccccc) << 1;
783 r += !!(x & 0xf0f0f0f0) << 2;
784 r += !!(x & 0xff00ff00) << 3;
785 r += !!(x & 0xffff0000) << 4;
786#else
787 if (x & 0xaaaaaaaa) r += 1;
788 if (x & 0xcccccccc) r += 2;
789 if (x & 0xf0f0f0f0) r += 4;
790 if (x & 0xff00ff00) r += 8;
791 if (x & 0xffff0000) r += 16;
792#endif
793
794 return r;
795 }
796
797 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
798 ecb_function_ int
799 ecb_ctz64 (uint64_t x)
800 {
801 int shift = x & 0xffffffffU ? 0 : 32;
802 return ecb_ctz32 (x >> shift) + shift;
803 }
804
805 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
806 ecb_function_ int
807 ecb_popcount32 (uint32_t x)
808 {
809 x -= (x >> 1) & 0x55555555;
810 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
811 x = ((x >> 4) + x) & 0x0f0f0f0f;
812 x *= 0x01010101;
813
814 return x >> 24;
815 }
816
817 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
818 ecb_function_ int ecb_ld32 (uint32_t x)
819 {
820 int r = 0;
821
822 if (x >> 16) { x >>= 16; r += 16; }
823 if (x >> 8) { x >>= 8; r += 8; }
824 if (x >> 4) { x >>= 4; r += 4; }
825 if (x >> 2) { x >>= 2; r += 2; }
826 if (x >> 1) { r += 1; }
827
828 return r;
829 }
830
831 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
832 ecb_function_ int ecb_ld64 (uint64_t x)
833 {
834 int r = 0;
835
836 if (x >> 32) { x >>= 32; r += 32; }
837
838 return r + ecb_ld32 (x);
839 }
840#endif
841
842ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
843ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
844ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
845ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
846
847ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
848ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
849{
850 return ( (x * 0x0802U & 0x22110U)
851 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
852}
853
854ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
855ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
856{
857 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
858 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
859 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
860 x = ( x >> 8 ) | ( x << 8);
861
862 return x;
863}
864
865ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
866ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
867{
868 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
869 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
870 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
871 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
872 x = ( x >> 16 ) | ( x << 16);
873
874 return x;
875}
876
877/* popcount64 is only available on 64 bit cpus as gcc builtin */
878/* so for this version we are lazy */
879ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
880ecb_function_ int
881ecb_popcount64 (uint64_t x)
882{
883 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
884}
885
886ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
887ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
888ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
889ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
890ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
891ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
892ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
893ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
894
895ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
896ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
897ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
898ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
899ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
900ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
901ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
902ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
903
904#if ECB_GCC_VERSION(4,3)
905 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
906 #define ecb_bswap32(x) __builtin_bswap32 (x)
907 #define ecb_bswap64(x) __builtin_bswap64 (x)
908#else
909 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
910 ecb_function_ uint16_t
911 ecb_bswap16 (uint16_t x)
912 {
913 return ecb_rotl16 (x, 8);
914 }
915
916 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
917 ecb_function_ uint32_t
918 ecb_bswap32 (uint32_t x)
919 {
920 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
921 }
922
923 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
924 ecb_function_ uint64_t
925 ecb_bswap64 (uint64_t x)
926 {
927 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
928 }
929#endif
930
931#if ECB_GCC_VERSION(4,5)
932 #define ecb_unreachable() __builtin_unreachable ()
933#else
934 /* this seems to work fine, but gcc always emits a warning for it :/ */
935 ecb_inline void ecb_unreachable (void) ecb_noreturn;
936 ecb_inline void ecb_unreachable (void) { }
937#endif
938
939/* try to tell the compiler that some condition is definitely true */
940#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
941
942ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
943ecb_inline unsigned char
944ecb_byteorder_helper (void)
945{
946 const uint32_t u = 0x11223344;
947 return *(unsigned char *)&u;
948}
949
950ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
951ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
952ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
953ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
954
955#if ECB_GCC_VERSION(3,0) || ECB_C99
956 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
957#else
958 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
959#endif
960
961#if __cplusplus
962 template<typename T>
963 static inline T ecb_div_rd (T val, T div)
964 {
965 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
966 }
967 template<typename T>
968 static inline T ecb_div_ru (T val, T div)
969 {
970 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
971 }
972#else
973 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
974 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
975#endif
976
977#if ecb_cplusplus_does_not_suck
978 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
979 template<typename T, int N>
980 static inline int ecb_array_length (const T (&arr)[N])
981 {
982 return N;
983 }
984#else
985 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
986#endif
987
988#endif
989
990/* ECB.H END */
991
992#if ECB_MEMORY_FENCE_NEEDS_PTHREADS
993/* if your architecture doesn't need memory fences, e.g. because it is
994 * single-cpu/core, or if you use libev in a project that doesn't use libev
995 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
996 * libev, in which cases the memory fences become nops.
997 * alternatively, you can remove this #error and link against libpthread,
998 * which will then provide the memory fences.
999 */
1000# error "memory fences not defined for your architecture, please report"
1001#endif
1002
1003#ifndef ECB_MEMORY_FENCE
1004# define ECB_MEMORY_FENCE do { } while (0)
1005# define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
1006# define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
1007#endif
1008
1009#define expect_false(cond) ecb_expect_false (cond)
1010#define expect_true(cond) ecb_expect_true (cond)
1011#define noinline ecb_noinline
1012
1013#define inline_size ecb_inline
1014
1015#if EV_FEATURE_CODE
1016# define inline_speed ecb_inline
1017#else
1018# define inline_speed static noinline
1019#endif
1020
1021#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
1022
1023#if EV_MINPRI == EV_MAXPRI
1024# define ABSPRI(w) (((W)w), 0)
1025#else
1026# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
1027#endif
1028
1029#define EMPTY /* required for microsofts broken pseudo-c compiler */
1030#define EMPTY2(a,b) /* used to suppress some warnings */
1031
1032typedef ev_watcher *W;
1033typedef ev_watcher_list *WL;
1034typedef ev_watcher_time *WT;
1035
1036#define ev_active(w) ((W)(w))->active
1037#define ev_at(w) ((WT)(w))->at
1038
1039#if EV_USE_REALTIME
1040/* sig_atomic_t is used to avoid per-thread variables or locking but still */
1041/* giving it a reasonably high chance of working on typical architectures */
1042static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
1043#endif
1044
1045#if EV_USE_MONOTONIC
1046static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
1047#endif
1048
1049#ifndef EV_FD_TO_WIN32_HANDLE
1050# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
1051#endif
1052#ifndef EV_WIN32_HANDLE_TO_FD
1053# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
1054#endif
1055#ifndef EV_WIN32_CLOSE_FD
1056# define EV_WIN32_CLOSE_FD(fd) close (fd)
1057#endif
1058
1059#ifdef _WIN32
1060# include "ev_win32.c"
1061#endif
1062
1063/*****************************************************************************/
1064
1065/* define a suitable floor function (only used by periodics atm) */
1066
1067#if EV_USE_FLOOR
1068# include <math.h>
1069# define ev_floor(v) floor (v)
1070#else
1071
1072#include <float.h>
1073
1074/* a floor() replacement function, should be independent of ev_tstamp type */
1075static ev_tstamp noinline
1076ev_floor (ev_tstamp v)
1077{
1078 /* the choice of shift factor is not terribly important */
1079#if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1080 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1081#else
1082 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1083#endif
1084
1085 /* argument too large for an unsigned long? */
1086 if (expect_false (v >= shift))
1087 {
1088 ev_tstamp f;
1089
1090 if (v == v - 1.)
1091 return v; /* very large number */
1092
1093 f = shift * ev_floor (v * (1. / shift));
1094 return f + ev_floor (v - f);
1095 }
1096
1097 /* special treatment for negative args? */
1098 if (expect_false (v < 0.))
1099 {
1100 ev_tstamp f = -ev_floor (-v);
1101
1102 return f - (f == v ? 0 : 1);
1103 }
1104
1105 /* fits into an unsigned long */
1106 return (unsigned long)v;
1107}
1108
1109#endif
1110
1111/*****************************************************************************/
1112
1113#ifdef __linux
1114# include <sys/utsname.h>
1115#endif
1116
1117static unsigned int noinline ecb_cold
1118ev_linux_version (void)
1119{
1120#ifdef __linux
1121 unsigned int v = 0;
1122 struct utsname buf;
1123 int i;
1124 char *p = buf.release;
1125
1126 if (uname (&buf))
1127 return 0;
1128
1129 for (i = 3+1; --i; )
1130 {
1131 unsigned int c = 0;
1132
1133 for (;;)
1134 {
1135 if (*p >= '0' && *p <= '9')
1136 c = c * 10 + *p++ - '0';
1137 else
1138 {
1139 p += *p == '.';
1140 break;
1141 }
1142 }
1143
1144 v = (v << 8) | c;
1145 }
1146
1147 return v;
1148#else
1149 return 0;
1150#endif
1151}
1152
1153/*****************************************************************************/
1154
1155#if EV_AVOID_STDIO
1156static void noinline ecb_cold
1157ev_printerr (const char *msg)
1158{
1159 write (STDERR_FILENO, msg, strlen (msg));
1160}
1161#endif
1162
1163static void (*syserr_cb)(const char *msg) EV_THROW;
1164
1165void ecb_cold
1166ev_set_syserr_cb (void (*cb)(const char *msg) EV_THROW) EV_THROW
1167{
1168 syserr_cb = cb;
1169}
1170
1171static void noinline ecb_cold
1172ev_syserr (const char *msg)
1173{
1174 if (!msg)
1175 msg = "(libev) system error";
1176
1177 if (syserr_cb)
1178 syserr_cb (msg);
1179 else
1180 {
1181#if EV_AVOID_STDIO
1182 ev_printerr (msg);
1183 ev_printerr (": ");
1184 ev_printerr (strerror (errno));
1185 ev_printerr ("\n");
1186#else
1187 perror (msg);
1188#endif
1189 abort ();
1190 }
1191}
1192
1193static void *
1194ev_realloc_emul (void *ptr, long size) EV_THROW
1195{
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 * recently, also (at least) fedora and debian started breaking it,
1200 * despite documenting it otherwise.
1201 */
1202
1203 if (size)
1204 return realloc (ptr, size);
1205
1206 free (ptr);
1207 return 0;
1208}
1209
1210static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1211
1212void ecb_cold
1213ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
1214{
1215 alloc = cb;
1216}
1217
1218inline_speed void *
1219ev_realloc (void *ptr, long size)
1220{
1221 ptr = alloc (ptr, size);
1222
1223 if (!ptr && size)
1224 {
1225#if EV_AVOID_STDIO
1226 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1227#else
1228 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1229#endif
1230 abort ();
1231 }
1232
1233 return ptr;
1234}
1235
1236#define ev_malloc(size) ev_realloc (0, (size))
1237#define ev_free(ptr) ev_realloc ((ptr), 0)
1238
1239/*****************************************************************************/
1240
1241/* set in reify when reification needed */
1242#define EV_ANFD_REIFY 1
1243
1244/* file descriptor info structure */
1245typedef struct
1246{
1247 WL head;
1248 unsigned char events; /* the events watched for */
1249 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1250 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1251 unsigned char unused;
1252#if EV_USE_EPOLL
1253 unsigned int egen; /* generation counter to counter epoll bugs */
1254#endif
1255#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1256 SOCKET handle;
1257#endif
1258#if EV_USE_IOCP
1259 OVERLAPPED or, ow;
1260#endif
1261} ANFD;
1262
1263/* stores the pending event set for a given watcher */
1264typedef struct
1265{
1266 W w;
1267 int events; /* the pending event set for the given watcher */
1268} ANPENDING;
1269
1270#if EV_USE_INOTIFY
1271/* hash table entry per inotify-id */
1272typedef struct
1273{
1274 WL head;
1275} ANFS;
1276#endif
1277
1278/* Heap Entry */
1279#if EV_HEAP_CACHE_AT
1280 /* a heap element */
1281 typedef struct {
1282 ev_tstamp at;
1283 WT w;
1284 } ANHE;
1285
1286 #define ANHE_w(he) (he).w /* access watcher, read-write */
1287 #define ANHE_at(he) (he).at /* access cached at, read-only */
1288 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1289#else
1290 /* a heap element */
1291 typedef WT ANHE;
1292
1293 #define ANHE_w(he) (he)
1294 #define ANHE_at(he) (he)->at
1295 #define ANHE_at_cache(he)
1296#endif
1297
1298#if EV_MULTIPLICITY
1299
1300 struct ev_loop
1301 {
1302 ev_tstamp ev_rt_now;
1303 #define ev_rt_now ((loop)->ev_rt_now)
1304 #define VAR(name,decl) decl;
1305 #include "ev_vars.h"
1306 #undef VAR
1307 };
1308 #include "ev_wrap.h"
1309
1310 static struct ev_loop default_loop_struct;
1311 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1312
1313#else
1314
1315 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1316 #define VAR(name,decl) static decl;
1317 #include "ev_vars.h"
1318 #undef VAR
1319
1320 static int ev_default_loop_ptr;
1321
1322#endif
1323
1324#if EV_FEATURE_API
1325# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1326# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1327# define EV_INVOKE_PENDING invoke_cb (EV_A)
1328#else
1329# define EV_RELEASE_CB (void)0
1330# define EV_ACQUIRE_CB (void)0
1331# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1332#endif
1333
1334#define EVBREAK_RECURSE 0x80
1335
1336/*****************************************************************************/
1337
1338#ifndef EV_HAVE_EV_TIME
86ev_tstamp 1339ev_tstamp
87ev_time (void) 1340ev_time (void) EV_THROW
88{ 1341{
89#if HAVE_REALTIME 1342#if EV_USE_REALTIME
1343 if (expect_true (have_realtime))
1344 {
90 struct timespec ts; 1345 struct timespec ts;
91 clock_gettime (CLOCK_REALTIME, &ts); 1346 clock_gettime (CLOCK_REALTIME, &ts);
92 return ts.tv_sec + ts.tv_nsec * 1e-9; 1347 return ts.tv_sec + ts.tv_nsec * 1e-9;
93#else 1348 }
1349#endif
1350
94 struct timeval tv; 1351 struct timeval tv;
95 gettimeofday (&tv, 0); 1352 gettimeofday (&tv, 0);
96 return tv.tv_sec + tv.tv_usec * 1e-6; 1353 return tv.tv_sec + tv.tv_usec * 1e-6;
97#endif
98} 1354}
1355#endif
99 1356
100static ev_tstamp 1357inline_size ev_tstamp
101get_clock (void) 1358get_clock (void)
102{ 1359{
103#if HAVE_MONOTONIC 1360#if EV_USE_MONOTONIC
104 if (have_monotonic) 1361 if (expect_true (have_monotonic))
105 { 1362 {
106 struct timespec ts; 1363 struct timespec ts;
107 clock_gettime (CLOCK_MONOTONIC, &ts); 1364 clock_gettime (CLOCK_MONOTONIC, &ts);
108 return ts.tv_sec + ts.tv_nsec * 1e-9; 1365 return ts.tv_sec + ts.tv_nsec * 1e-9;
109 } 1366 }
110#endif 1367#endif
111 1368
112 return ev_time (); 1369 return ev_time ();
113} 1370}
114 1371
115#define array_needsize(base,cur,cnt,init) \ 1372#if EV_MULTIPLICITY
116 if ((cnt) > cur) \ 1373ev_tstamp
117 { \ 1374ev_now (EV_P) EV_THROW
118 int newcnt = cur; \ 1375{
119 do \ 1376 return ev_rt_now;
120 { \ 1377}
121 newcnt = (newcnt << 1) | 4 & ~3; \ 1378#endif
122 } \ 1379
123 while ((cnt) > newcnt); \ 1380void
124 \ 1381ev_sleep (ev_tstamp delay) EV_THROW
125 base = realloc (base, sizeof (*base) * (newcnt)); \ 1382{
126 init (base + cur, newcnt - cur); \ 1383 if (delay > 0.)
127 cur = newcnt; \
128 } 1384 {
1385#if EV_USE_NANOSLEEP
1386 struct timespec ts;
1387
1388 EV_TS_SET (ts, delay);
1389 nanosleep (&ts, 0);
1390#elif defined _WIN32
1391 Sleep ((unsigned long)(delay * 1e3));
1392#else
1393 struct timeval tv;
1394
1395 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1396 /* something not guaranteed by newer posix versions, but guaranteed */
1397 /* by older ones */
1398 EV_TV_SET (tv, delay);
1399 select (0, 0, 0, 0, &tv);
1400#endif
1401 }
1402}
129 1403
130/*****************************************************************************/ 1404/*****************************************************************************/
131 1405
1406#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1407
1408/* find a suitable new size for the given array, */
1409/* hopefully by rounding to a nice-to-malloc size */
1410inline_size int
1411array_nextsize (int elem, int cur, int cnt)
1412{
1413 int ncur = cur + 1;
1414
1415 do
1416 ncur <<= 1;
1417 while (cnt > ncur);
1418
1419 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1420 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1421 {
1422 ncur *= elem;
1423 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1424 ncur = ncur - sizeof (void *) * 4;
1425 ncur /= elem;
1426 }
1427
1428 return ncur;
1429}
1430
1431static void * noinline ecb_cold
1432array_realloc (int elem, void *base, int *cur, int cnt)
1433{
1434 *cur = array_nextsize (elem, *cur, cnt);
1435 return ev_realloc (base, elem * *cur);
1436}
1437
1438#define array_init_zero(base,count) \
1439 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1440
1441#define array_needsize(type,base,cur,cnt,init) \
1442 if (expect_false ((cnt) > (cur))) \
1443 { \
1444 int ecb_unused ocur_ = (cur); \
1445 (base) = (type *)array_realloc \
1446 (sizeof (type), (base), &(cur), (cnt)); \
1447 init ((base) + (ocur_), (cur) - ocur_); \
1448 }
1449
1450#if 0
1451#define array_slim(type,stem) \
1452 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1453 { \
1454 stem ## max = array_roundsize (stem ## cnt >> 1); \
1455 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1456 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1457 }
1458#endif
1459
1460#define array_free(stem, idx) \
1461 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1462
1463/*****************************************************************************/
1464
1465/* dummy callback for pending events */
1466static void noinline
1467pendingcb (EV_P_ ev_prepare *w, int revents)
1468{
1469}
1470
1471void noinline
1472ev_feed_event (EV_P_ void *w, int revents) EV_THROW
1473{
1474 W w_ = (W)w;
1475 int pri = ABSPRI (w_);
1476
1477 if (expect_false (w_->pending))
1478 pendings [pri][w_->pending - 1].events |= revents;
1479 else
1480 {
1481 w_->pending = ++pendingcnt [pri];
1482 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1483 pendings [pri][w_->pending - 1].w = w_;
1484 pendings [pri][w_->pending - 1].events = revents;
1485 }
1486
1487 pendingpri = NUMPRI - 1;
1488}
1489
1490inline_speed void
1491feed_reverse (EV_P_ W w)
1492{
1493 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1494 rfeeds [rfeedcnt++] = w;
1495}
1496
1497inline_size void
1498feed_reverse_done (EV_P_ int revents)
1499{
1500 do
1501 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1502 while (rfeedcnt);
1503}
1504
1505inline_speed void
1506queue_events (EV_P_ W *events, int eventcnt, int type)
1507{
1508 int i;
1509
1510 for (i = 0; i < eventcnt; ++i)
1511 ev_feed_event (EV_A_ events [i], type);
1512}
1513
1514/*****************************************************************************/
1515
1516inline_speed void
1517fd_event_nocheck (EV_P_ int fd, int revents)
1518{
1519 ANFD *anfd = anfds + fd;
1520 ev_io *w;
1521
1522 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1523 {
1524 int ev = w->events & revents;
1525
1526 if (ev)
1527 ev_feed_event (EV_A_ (W)w, ev);
1528 }
1529}
1530
1531/* do not submit kernel events for fds that have reify set */
1532/* because that means they changed while we were polling for new events */
1533inline_speed void
1534fd_event (EV_P_ int fd, int revents)
1535{
1536 ANFD *anfd = anfds + fd;
1537
1538 if (expect_true (!anfd->reify))
1539 fd_event_nocheck (EV_A_ fd, revents);
1540}
1541
1542void
1543ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
1544{
1545 if (fd >= 0 && fd < anfdmax)
1546 fd_event_nocheck (EV_A_ fd, revents);
1547}
1548
1549/* make sure the external fd watch events are in-sync */
1550/* with the kernel/libev internal state */
1551inline_size void
1552fd_reify (EV_P)
1553{
1554 int i;
1555
1556#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1557 for (i = 0; i < fdchangecnt; ++i)
1558 {
1559 int fd = fdchanges [i];
1560 ANFD *anfd = anfds + fd;
1561
1562 if (anfd->reify & EV__IOFDSET && anfd->head)
1563 {
1564 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1565
1566 if (handle != anfd->handle)
1567 {
1568 unsigned long arg;
1569
1570 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1571
1572 /* handle changed, but fd didn't - we need to do it in two steps */
1573 backend_modify (EV_A_ fd, anfd->events, 0);
1574 anfd->events = 0;
1575 anfd->handle = handle;
1576 }
1577 }
1578 }
1579#endif
1580
1581 for (i = 0; i < fdchangecnt; ++i)
1582 {
1583 int fd = fdchanges [i];
1584 ANFD *anfd = anfds + fd;
1585 ev_io *w;
1586
1587 unsigned char o_events = anfd->events;
1588 unsigned char o_reify = anfd->reify;
1589
1590 anfd->reify = 0;
1591
1592 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1593 {
1594 anfd->events = 0;
1595
1596 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1597 anfd->events |= (unsigned char)w->events;
1598
1599 if (o_events != anfd->events)
1600 o_reify = EV__IOFDSET; /* actually |= */
1601 }
1602
1603 if (o_reify & EV__IOFDSET)
1604 backend_modify (EV_A_ fd, o_events, anfd->events);
1605 }
1606
1607 fdchangecnt = 0;
1608}
1609
1610/* something about the given fd changed */
1611inline_size void
1612fd_change (EV_P_ int fd, int flags)
1613{
1614 unsigned char reify = anfds [fd].reify;
1615 anfds [fd].reify |= flags;
1616
1617 if (expect_true (!reify))
1618 {
1619 ++fdchangecnt;
1620 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1621 fdchanges [fdchangecnt - 1] = fd;
1622 }
1623}
1624
1625/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1626inline_speed void ecb_cold
1627fd_kill (EV_P_ int fd)
1628{
1629 ev_io *w;
1630
1631 while ((w = (ev_io *)anfds [fd].head))
1632 {
1633 ev_io_stop (EV_A_ w);
1634 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1635 }
1636}
1637
1638/* check whether the given fd is actually valid, for error recovery */
1639inline_size int ecb_cold
1640fd_valid (int fd)
1641{
1642#ifdef _WIN32
1643 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1644#else
1645 return fcntl (fd, F_GETFD) != -1;
1646#endif
1647}
1648
1649/* called on EBADF to verify fds */
1650static void noinline ecb_cold
1651fd_ebadf (EV_P)
1652{
1653 int fd;
1654
1655 for (fd = 0; fd < anfdmax; ++fd)
1656 if (anfds [fd].events)
1657 if (!fd_valid (fd) && errno == EBADF)
1658 fd_kill (EV_A_ fd);
1659}
1660
1661/* called on ENOMEM in select/poll to kill some fds and retry */
1662static void noinline ecb_cold
1663fd_enomem (EV_P)
1664{
1665 int fd;
1666
1667 for (fd = anfdmax; fd--; )
1668 if (anfds [fd].events)
1669 {
1670 fd_kill (EV_A_ fd);
1671 break;
1672 }
1673}
1674
1675/* usually called after fork if backend needs to re-arm all fds from scratch */
1676static void noinline
1677fd_rearm_all (EV_P)
1678{
1679 int fd;
1680
1681 for (fd = 0; fd < anfdmax; ++fd)
1682 if (anfds [fd].events)
1683 {
1684 anfds [fd].events = 0;
1685 anfds [fd].emask = 0;
1686 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1687 }
1688}
1689
1690/* used to prepare libev internal fd's */
1691/* this is not fork-safe */
1692inline_speed void
1693fd_intern (int fd)
1694{
1695#ifdef _WIN32
1696 unsigned long arg = 1;
1697 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1698#else
1699 fcntl (fd, F_SETFD, FD_CLOEXEC);
1700 fcntl (fd, F_SETFL, O_NONBLOCK);
1701#endif
1702}
1703
1704/*****************************************************************************/
1705
1706/*
1707 * the heap functions want a real array index. array index 0 is guaranteed to not
1708 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1709 * the branching factor of the d-tree.
1710 */
1711
1712/*
1713 * at the moment we allow libev the luxury of two heaps,
1714 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1715 * which is more cache-efficient.
1716 * the difference is about 5% with 50000+ watchers.
1717 */
1718#if EV_USE_4HEAP
1719
1720#define DHEAP 4
1721#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1722#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1723#define UPHEAP_DONE(p,k) ((p) == (k))
1724
1725/* away from the root */
1726inline_speed void
1727downheap (ANHE *heap, int N, int k)
1728{
1729 ANHE he = heap [k];
1730 ANHE *E = heap + N + HEAP0;
1731
1732 for (;;)
1733 {
1734 ev_tstamp minat;
1735 ANHE *minpos;
1736 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1737
1738 /* find minimum child */
1739 if (expect_true (pos + DHEAP - 1 < E))
1740 {
1741 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1742 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1743 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1744 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1745 }
1746 else if (pos < E)
1747 {
1748 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1749 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1750 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1751 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1752 }
1753 else
1754 break;
1755
1756 if (ANHE_at (he) <= minat)
1757 break;
1758
1759 heap [k] = *minpos;
1760 ev_active (ANHE_w (*minpos)) = k;
1761
1762 k = minpos - heap;
1763 }
1764
1765 heap [k] = he;
1766 ev_active (ANHE_w (he)) = k;
1767}
1768
1769#else /* 4HEAP */
1770
1771#define HEAP0 1
1772#define HPARENT(k) ((k) >> 1)
1773#define UPHEAP_DONE(p,k) (!(p))
1774
1775/* away from the root */
1776inline_speed void
1777downheap (ANHE *heap, int N, int k)
1778{
1779 ANHE he = heap [k];
1780
1781 for (;;)
1782 {
1783 int c = k << 1;
1784
1785 if (c >= N + HEAP0)
1786 break;
1787
1788 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1789 ? 1 : 0;
1790
1791 if (ANHE_at (he) <= ANHE_at (heap [c]))
1792 break;
1793
1794 heap [k] = heap [c];
1795 ev_active (ANHE_w (heap [k])) = k;
1796
1797 k = c;
1798 }
1799
1800 heap [k] = he;
1801 ev_active (ANHE_w (he)) = k;
1802}
1803#endif
1804
1805/* towards the root */
1806inline_speed void
1807upheap (ANHE *heap, int k)
1808{
1809 ANHE he = heap [k];
1810
1811 for (;;)
1812 {
1813 int p = HPARENT (k);
1814
1815 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1816 break;
1817
1818 heap [k] = heap [p];
1819 ev_active (ANHE_w (heap [k])) = k;
1820 k = p;
1821 }
1822
1823 heap [k] = he;
1824 ev_active (ANHE_w (he)) = k;
1825}
1826
1827/* move an element suitably so it is in a correct place */
1828inline_size void
1829adjustheap (ANHE *heap, int N, int k)
1830{
1831 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1832 upheap (heap, k);
1833 else
1834 downheap (heap, N, k);
1835}
1836
1837/* rebuild the heap: this function is used only once and executed rarely */
1838inline_size void
1839reheap (ANHE *heap, int N)
1840{
1841 int i;
1842
1843 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1844 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1845 for (i = 0; i < N; ++i)
1846 upheap (heap, i + HEAP0);
1847}
1848
1849/*****************************************************************************/
1850
1851/* associate signal watchers to a signal signal */
132typedef struct 1852typedef struct
133{ 1853{
134 struct ev_io *head; 1854 EV_ATOMIC_T pending;
135 unsigned char wev, rev; /* want, received event set */ 1855#if EV_MULTIPLICITY
136} ANFD; 1856 EV_P;
1857#endif
1858 WL head;
1859} ANSIG;
137 1860
138static ANFD *anfds; 1861static ANSIG signals [EV_NSIG - 1];
139static int anfdmax;
140 1862
141static int *fdchanges; 1863/*****************************************************************************/
142static int fdchangemax, fdchangecnt;
143 1864
1865#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1866
1867static void noinline ecb_cold
1868evpipe_init (EV_P)
1869{
1870 if (!ev_is_active (&pipe_w))
1871 {
1872# if EV_USE_EVENTFD
1873 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1874 if (evfd < 0 && errno == EINVAL)
1875 evfd = eventfd (0, 0);
1876
1877 if (evfd >= 0)
1878 {
1879 evpipe [0] = -1;
1880 fd_intern (evfd); /* doing it twice doesn't hurt */
1881 ev_io_set (&pipe_w, evfd, EV_READ);
1882 }
1883 else
1884# endif
1885 {
1886 while (pipe (evpipe))
1887 ev_syserr ("(libev) error creating signal/async pipe");
1888
1889 fd_intern (evpipe [0]);
1890 fd_intern (evpipe [1]);
1891 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1892 }
1893
1894 ev_io_start (EV_A_ &pipe_w);
1895 ev_unref (EV_A); /* watcher should not keep loop alive */
1896 }
1897}
1898
1899inline_speed void
1900evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1901{
1902 ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
1903
1904 if (expect_true (*flag))
1905 return;
1906
1907 *flag = 1;
1908 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1909
1910 pipe_write_skipped = 1;
1911
1912 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1913
1914 if (pipe_write_wanted)
1915 {
1916 int old_errno;
1917
1918 pipe_write_skipped = 0;
1919 ECB_MEMORY_FENCE_RELEASE;
1920
1921 old_errno = errno; /* save errno because write will clobber it */
1922
1923#if EV_USE_EVENTFD
1924 if (evfd >= 0)
1925 {
1926 uint64_t counter = 1;
1927 write (evfd, &counter, sizeof (uint64_t));
1928 }
1929 else
1930#endif
1931 {
1932#ifdef _WIN32
1933 WSABUF buf;
1934 DWORD sent;
1935 buf.buf = &buf;
1936 buf.len = 1;
1937 WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
1938#else
1939 write (evpipe [1], &(evpipe [1]), 1);
1940#endif
1941 }
1942
1943 errno = old_errno;
1944 }
1945}
1946
1947/* called whenever the libev signal pipe */
1948/* got some events (signal, async) */
144static void 1949static void
145anfds_init (ANFD *base, int count) 1950pipecb (EV_P_ ev_io *iow, int revents)
146{ 1951{
147 while (count--) 1952 int i;
148 { 1953
149 base->head = 0; 1954 if (revents & EV_READ)
150 base->wev = base->rev = EV_NONE;
151 ++base;
152 } 1955 {
153} 1956#if EV_USE_EVENTFD
1957 if (evfd >= 0)
1958 {
1959 uint64_t counter;
1960 read (evfd, &counter, sizeof (uint64_t));
1961 }
1962 else
1963#endif
1964 {
1965 char dummy[4];
1966#ifdef _WIN32
1967 WSABUF buf;
1968 DWORD recvd;
1969 DWORD flags = 0;
1970 buf.buf = dummy;
1971 buf.len = sizeof (dummy);
1972 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
1973#else
1974 read (evpipe [0], &dummy, sizeof (dummy));
1975#endif
1976 }
1977 }
154 1978
155typedef struct 1979 pipe_write_skipped = 0;
156{
157 W w;
158 int events;
159} ANPENDING;
160 1980
161static ANPENDING *pendings; 1981 ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
162static int pendingmax, pendingcnt; 1982
1983#if EV_SIGNAL_ENABLE
1984 if (sig_pending)
1985 {
1986 sig_pending = 0;
1987
1988 ECB_MEMORY_FENCE;
1989
1990 for (i = EV_NSIG - 1; i--; )
1991 if (expect_false (signals [i].pending))
1992 ev_feed_signal_event (EV_A_ i + 1);
1993 }
1994#endif
1995
1996#if EV_ASYNC_ENABLE
1997 if (async_pending)
1998 {
1999 async_pending = 0;
2000
2001 ECB_MEMORY_FENCE;
2002
2003 for (i = asynccnt; i--; )
2004 if (asyncs [i]->sent)
2005 {
2006 asyncs [i]->sent = 0;
2007 ECB_MEMORY_FENCE_RELEASE;
2008 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
2009 }
2010 }
2011#endif
2012}
2013
2014/*****************************************************************************/
2015
2016void
2017ev_feed_signal (int signum) EV_THROW
2018{
2019#if EV_MULTIPLICITY
2020 EV_P = signals [signum - 1].loop;
2021
2022 if (!EV_A)
2023 return;
2024#endif
2025
2026 if (!ev_active (&pipe_w))
2027 return;
2028
2029 signals [signum - 1].pending = 1;
2030 evpipe_write (EV_A_ &sig_pending);
2031}
163 2032
164static void 2033static void
165event (W w, int events) 2034ev_sighandler (int signum)
166{ 2035{
167 if (w->active) 2036#ifdef _WIN32
168 { 2037 signal (signum, ev_sighandler);
169 w->pending = ++pendingcnt; 2038#endif
170 array_needsize (pendings, pendingmax, pendingcnt, );
171 pendings [pendingcnt - 1].w = w;
172 pendings [pendingcnt - 1].events = events;
173 }
174}
175 2039
2040 ev_feed_signal (signum);
2041}
2042
2043void noinline
2044ev_feed_signal_event (EV_P_ int signum) EV_THROW
2045{
2046 WL w;
2047
2048 if (expect_false (signum <= 0 || signum >= EV_NSIG))
2049 return;
2050
2051 --signum;
2052
2053#if EV_MULTIPLICITY
2054 /* it is permissible to try to feed a signal to the wrong loop */
2055 /* or, likely more useful, feeding a signal nobody is waiting for */
2056
2057 if (expect_false (signals [signum].loop != EV_A))
2058 return;
2059#endif
2060
2061 signals [signum].pending = 0;
2062 ECB_MEMORY_FENCE_RELEASE;
2063
2064 for (w = signals [signum].head; w; w = w->next)
2065 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2066}
2067
2068#if EV_USE_SIGNALFD
176static void 2069static void
177fd_event (int fd, int events) 2070sigfdcb (EV_P_ ev_io *iow, int revents)
178{ 2071{
179 ANFD *anfd = anfds + fd; 2072 struct signalfd_siginfo si[2], *sip; /* these structs are big */
180 struct ev_io *w;
181 2073
182 for (w = anfd->head; w; w = w->next) 2074 for (;;)
183 {
184 int ev = w->events & events;
185
186 if (ev)
187 event ((W)w, ev);
188 } 2075 {
189} 2076 ssize_t res = read (sigfd, si, sizeof (si));
190 2077
191static void 2078 /* not ISO-C, as res might be -1, but works with SuS */
192queue_events (W *events, int eventcnt, int type) 2079 for (sip = si; (char *)sip < (char *)si + res; ++sip)
193{ 2080 ev_feed_signal_event (EV_A_ sip->ssi_signo);
194 int i;
195 2081
196 for (i = 0; i < eventcnt; ++i) 2082 if (res < (ssize_t)sizeof (si))
197 event (events [i], type); 2083 break;
2084 }
198} 2085}
2086#endif
199 2087
200/* called on EBADF to verify fds */ 2088#endif
201static void
202fd_recheck (void)
203{
204 int fd;
205
206 for (fd = 0; fd < anfdmax; ++fd)
207 if (anfds [fd].wev)
208 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
209 while (anfds [fd].head)
210 {
211 event ((W)anfds [fd].head, EV_ERROR);
212 evio_stop (anfds [fd].head);
213 }
214}
215 2089
216/*****************************************************************************/ 2090/*****************************************************************************/
217 2091
218static struct ev_timer **timers; 2092#if EV_CHILD_ENABLE
219static int timermax, timercnt; 2093static WL childs [EV_PID_HASHSIZE];
220 2094
221static struct ev_periodic **periodics;
222static int periodicmax, periodiccnt;
223
224static void
225upheap (WT *timers, int k)
226{
227 WT w = timers [k];
228
229 while (k && timers [k >> 1]->at > w->at)
230 {
231 timers [k] = timers [k >> 1];
232 timers [k]->active = k + 1;
233 k >>= 1;
234 }
235
236 timers [k] = w;
237 timers [k]->active = k + 1;
238
239}
240
241static void
242downheap (WT *timers, int N, int k)
243{
244 WT w = timers [k];
245
246 while (k < (N >> 1))
247 {
248 int j = k << 1;
249
250 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
251 ++j;
252
253 if (w->at <= timers [j]->at)
254 break;
255
256 timers [k] = timers [j];
257 timers [k]->active = k + 1;
258 k = j;
259 }
260
261 timers [k] = w;
262 timers [k]->active = k + 1;
263}
264
265/*****************************************************************************/
266
267typedef struct
268{
269 struct ev_signal *head;
270 sig_atomic_t gotsig;
271} ANSIG;
272
273static ANSIG *signals;
274static int signalmax;
275
276static int sigpipe [2];
277static sig_atomic_t gotsig;
278static struct ev_io sigev;
279
280static void
281signals_init (ANSIG *base, int count)
282{
283 while (count--)
284 {
285 base->head = 0;
286 base->gotsig = 0;
287 ++base;
288 }
289}
290
291static void
292sighandler (int signum)
293{
294 signals [signum - 1].gotsig = 1;
295
296 if (!gotsig)
297 {
298 gotsig = 1;
299 write (sigpipe [1], &gotsig, 1);
300 }
301}
302
303static void
304sigcb (struct ev_io *iow, int revents)
305{
306 struct ev_signal *w;
307 int sig;
308
309 gotsig = 0;
310 read (sigpipe [0], &revents, 1);
311
312 for (sig = signalmax; sig--; )
313 if (signals [sig].gotsig)
314 {
315 signals [sig].gotsig = 0;
316
317 for (w = signals [sig].head; w; w = w->next)
318 event ((W)w, EV_SIGNAL);
319 }
320}
321
322static void
323siginit (void)
324{
325 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
326 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
327
328 /* rather than sort out wether we really need nb, set it */
329 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
330 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
331
332 evio_set (&sigev, sigpipe [0], EV_READ);
333 evio_start (&sigev);
334}
335
336/*****************************************************************************/
337
338static struct ev_idle **idles;
339static int idlemax, idlecnt;
340
341static struct ev_prepare **prepares;
342static int preparemax, preparecnt;
343
344static struct ev_check **checks;
345static int checkmax, checkcnt;
346
347/*****************************************************************************/
348
349static struct ev_child *childs [PID_HASHSIZE];
350static struct ev_signal childev; 2095static ev_signal childev;
2096
2097#ifndef WIFCONTINUED
2098# define WIFCONTINUED(status) 0
2099#endif
2100
2101/* handle a single child status event */
2102inline_speed void
2103child_reap (EV_P_ int chain, int pid, int status)
2104{
2105 ev_child *w;
2106 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2107
2108 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2109 {
2110 if ((w->pid == pid || !w->pid)
2111 && (!traced || (w->flags & 1)))
2112 {
2113 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2114 w->rpid = pid;
2115 w->rstatus = status;
2116 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2117 }
2118 }
2119}
351 2120
352#ifndef WCONTINUED 2121#ifndef WCONTINUED
353# define WCONTINUED 0 2122# define WCONTINUED 0
354#endif 2123#endif
355 2124
2125/* called on sigchld etc., calls waitpid */
356static void 2126static void
357childcb (struct ev_signal *sw, int revents) 2127childcb (EV_P_ ev_signal *sw, int revents)
358{ 2128{
359 struct ev_child *w;
360 int pid, status; 2129 int pid, status;
361 2130
2131 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
362 while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1) 2132 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
363 for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next) 2133 if (!WCONTINUED
364 if (w->pid == pid || w->pid == -1) 2134 || errno != EINVAL
2135 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2136 return;
2137
2138 /* make sure we are called again until all children have been reaped */
2139 /* we need to do it this way so that the callback gets called before we continue */
2140 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2141
2142 child_reap (EV_A_ pid, pid, status);
2143 if ((EV_PID_HASHSIZE) > 1)
2144 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2145}
2146
2147#endif
2148
2149/*****************************************************************************/
2150
2151#if EV_USE_IOCP
2152# include "ev_iocp.c"
2153#endif
2154#if EV_USE_PORT
2155# include "ev_port.c"
2156#endif
2157#if EV_USE_KQUEUE
2158# include "ev_kqueue.c"
2159#endif
2160#if EV_USE_EPOLL
2161# include "ev_epoll.c"
2162#endif
2163#if EV_USE_POLL
2164# include "ev_poll.c"
2165#endif
2166#if EV_USE_SELECT
2167# include "ev_select.c"
2168#endif
2169
2170int ecb_cold
2171ev_version_major (void) EV_THROW
2172{
2173 return EV_VERSION_MAJOR;
2174}
2175
2176int ecb_cold
2177ev_version_minor (void) EV_THROW
2178{
2179 return EV_VERSION_MINOR;
2180}
2181
2182/* return true if we are running with elevated privileges and should ignore env variables */
2183int inline_size ecb_cold
2184enable_secure (void)
2185{
2186#ifdef _WIN32
2187 return 0;
2188#else
2189 return getuid () != geteuid ()
2190 || getgid () != getegid ();
2191#endif
2192}
2193
2194unsigned int ecb_cold
2195ev_supported_backends (void) EV_THROW
2196{
2197 unsigned int flags = 0;
2198
2199 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2200 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2201 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2202 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2203 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2204
2205 return flags;
2206}
2207
2208unsigned int ecb_cold
2209ev_recommended_backends (void) EV_THROW
2210{
2211 unsigned int flags = ev_supported_backends ();
2212
2213#ifndef __NetBSD__
2214 /* kqueue is borked on everything but netbsd apparently */
2215 /* it usually doesn't work correctly on anything but sockets and pipes */
2216 flags &= ~EVBACKEND_KQUEUE;
2217#endif
2218#ifdef __APPLE__
2219 /* only select works correctly on that "unix-certified" platform */
2220 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2221 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2222#endif
2223#ifdef __FreeBSD__
2224 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2225#endif
2226
2227 return flags;
2228}
2229
2230unsigned int ecb_cold
2231ev_embeddable_backends (void) EV_THROW
2232{
2233 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2234
2235 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2236 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2237 flags &= ~EVBACKEND_EPOLL;
2238
2239 return flags;
2240}
2241
2242unsigned int
2243ev_backend (EV_P) EV_THROW
2244{
2245 return backend;
2246}
2247
2248#if EV_FEATURE_API
2249unsigned int
2250ev_iteration (EV_P) EV_THROW
2251{
2252 return loop_count;
2253}
2254
2255unsigned int
2256ev_depth (EV_P) EV_THROW
2257{
2258 return loop_depth;
2259}
2260
2261void
2262ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2263{
2264 io_blocktime = interval;
2265}
2266
2267void
2268ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2269{
2270 timeout_blocktime = interval;
2271}
2272
2273void
2274ev_set_userdata (EV_P_ void *data) EV_THROW
2275{
2276 userdata = data;
2277}
2278
2279void *
2280ev_userdata (EV_P) EV_THROW
2281{
2282 return userdata;
2283}
2284
2285void
2286ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) EV_THROW
2287{
2288 invoke_cb = invoke_pending_cb;
2289}
2290
2291void
2292ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
2293{
2294 release_cb = release;
2295 acquire_cb = acquire;
2296}
2297#endif
2298
2299/* initialise a loop structure, must be zero-initialised */
2300static void noinline ecb_cold
2301loop_init (EV_P_ unsigned int flags) EV_THROW
2302{
2303 if (!backend)
2304 {
2305 origflags = flags;
2306
2307#if EV_USE_REALTIME
2308 if (!have_realtime)
365 { 2309 {
366 w->status = status; 2310 struct timespec ts;
367 event ((W)w, EV_CHILD); 2311
2312 if (!clock_gettime (CLOCK_REALTIME, &ts))
2313 have_realtime = 1;
368 } 2314 }
2315#endif
2316
2317#if EV_USE_MONOTONIC
2318 if (!have_monotonic)
2319 {
2320 struct timespec ts;
2321
2322 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2323 have_monotonic = 1;
2324 }
2325#endif
2326
2327 /* pid check not overridable via env */
2328#ifndef _WIN32
2329 if (flags & EVFLAG_FORKCHECK)
2330 curpid = getpid ();
2331#endif
2332
2333 if (!(flags & EVFLAG_NOENV)
2334 && !enable_secure ()
2335 && getenv ("LIBEV_FLAGS"))
2336 flags = atoi (getenv ("LIBEV_FLAGS"));
2337
2338 ev_rt_now = ev_time ();
2339 mn_now = get_clock ();
2340 now_floor = mn_now;
2341 rtmn_diff = ev_rt_now - mn_now;
2342#if EV_FEATURE_API
2343 invoke_cb = ev_invoke_pending;
2344#endif
2345
2346 io_blocktime = 0.;
2347 timeout_blocktime = 0.;
2348 backend = 0;
2349 backend_fd = -1;
2350 sig_pending = 0;
2351#if EV_ASYNC_ENABLE
2352 async_pending = 0;
2353#endif
2354 pipe_write_skipped = 0;
2355 pipe_write_wanted = 0;
2356#if EV_USE_INOTIFY
2357 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2358#endif
2359#if EV_USE_SIGNALFD
2360 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2361#endif
2362
2363 if (!(flags & EVBACKEND_MASK))
2364 flags |= ev_recommended_backends ();
2365
2366#if EV_USE_IOCP
2367 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2368#endif
2369#if EV_USE_PORT
2370 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2371#endif
2372#if EV_USE_KQUEUE
2373 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2374#endif
2375#if EV_USE_EPOLL
2376 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2377#endif
2378#if EV_USE_POLL
2379 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2380#endif
2381#if EV_USE_SELECT
2382 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2383#endif
2384
2385 ev_prepare_init (&pending_w, pendingcb);
2386
2387#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2388 ev_init (&pipe_w, pipecb);
2389 ev_set_priority (&pipe_w, EV_MAXPRI);
2390#endif
2391 }
2392}
2393
2394/* free up a loop structure */
2395void ecb_cold
2396ev_loop_destroy (EV_P)
2397{
2398 int i;
2399
2400#if EV_MULTIPLICITY
2401 /* mimic free (0) */
2402 if (!EV_A)
2403 return;
2404#endif
2405
2406#if EV_CLEANUP_ENABLE
2407 /* queue cleanup watchers (and execute them) */
2408 if (expect_false (cleanupcnt))
2409 {
2410 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2411 EV_INVOKE_PENDING;
2412 }
2413#endif
2414
2415#if EV_CHILD_ENABLE
2416 if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
2417 {
2418 ev_ref (EV_A); /* child watcher */
2419 ev_signal_stop (EV_A_ &childev);
2420 }
2421#endif
2422
2423 if (ev_is_active (&pipe_w))
2424 {
2425 /*ev_ref (EV_A);*/
2426 /*ev_io_stop (EV_A_ &pipe_w);*/
2427
2428#if EV_USE_EVENTFD
2429 if (evfd >= 0)
2430 close (evfd);
2431#endif
2432
2433 if (evpipe [0] >= 0)
2434 {
2435 EV_WIN32_CLOSE_FD (evpipe [0]);
2436 EV_WIN32_CLOSE_FD (evpipe [1]);
2437 }
2438 }
2439
2440#if EV_USE_SIGNALFD
2441 if (ev_is_active (&sigfd_w))
2442 close (sigfd);
2443#endif
2444
2445#if EV_USE_INOTIFY
2446 if (fs_fd >= 0)
2447 close (fs_fd);
2448#endif
2449
2450 if (backend_fd >= 0)
2451 close (backend_fd);
2452
2453#if EV_USE_IOCP
2454 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2455#endif
2456#if EV_USE_PORT
2457 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2458#endif
2459#if EV_USE_KQUEUE
2460 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2461#endif
2462#if EV_USE_EPOLL
2463 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2464#endif
2465#if EV_USE_POLL
2466 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2467#endif
2468#if EV_USE_SELECT
2469 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2470#endif
2471
2472 for (i = NUMPRI; i--; )
2473 {
2474 array_free (pending, [i]);
2475#if EV_IDLE_ENABLE
2476 array_free (idle, [i]);
2477#endif
2478 }
2479
2480 ev_free (anfds); anfds = 0; anfdmax = 0;
2481
2482 /* have to use the microsoft-never-gets-it-right macro */
2483 array_free (rfeed, EMPTY);
2484 array_free (fdchange, EMPTY);
2485 array_free (timer, EMPTY);
2486#if EV_PERIODIC_ENABLE
2487 array_free (periodic, EMPTY);
2488#endif
2489#if EV_FORK_ENABLE
2490 array_free (fork, EMPTY);
2491#endif
2492#if EV_CLEANUP_ENABLE
2493 array_free (cleanup, EMPTY);
2494#endif
2495 array_free (prepare, EMPTY);
2496 array_free (check, EMPTY);
2497#if EV_ASYNC_ENABLE
2498 array_free (async, EMPTY);
2499#endif
2500
2501 backend = 0;
2502
2503#if EV_MULTIPLICITY
2504 if (ev_is_default_loop (EV_A))
2505#endif
2506 ev_default_loop_ptr = 0;
2507#if EV_MULTIPLICITY
2508 else
2509 ev_free (EV_A);
2510#endif
2511}
2512
2513#if EV_USE_INOTIFY
2514inline_size void infy_fork (EV_P);
2515#endif
2516
2517inline_size void
2518loop_fork (EV_P)
2519{
2520#if EV_USE_PORT
2521 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2522#endif
2523#if EV_USE_KQUEUE
2524 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2525#endif
2526#if EV_USE_EPOLL
2527 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2528#endif
2529#if EV_USE_INOTIFY
2530 infy_fork (EV_A);
2531#endif
2532
2533 if (ev_is_active (&pipe_w))
2534 {
2535 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2536
2537 ev_ref (EV_A);
2538 ev_io_stop (EV_A_ &pipe_w);
2539
2540#if EV_USE_EVENTFD
2541 if (evfd >= 0)
2542 close (evfd);
2543#endif
2544
2545 if (evpipe [0] >= 0)
2546 {
2547 EV_WIN32_CLOSE_FD (evpipe [0]);
2548 EV_WIN32_CLOSE_FD (evpipe [1]);
2549 }
2550
2551#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2552 evpipe_init (EV_A);
2553 /* iterate over everything, in case we missed something before */
2554 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2555#endif
2556 }
2557
2558 postfork = 0;
2559}
2560
2561#if EV_MULTIPLICITY
2562
2563struct ev_loop * ecb_cold
2564ev_loop_new (unsigned int flags) EV_THROW
2565{
2566 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2567
2568 memset (EV_A, 0, sizeof (struct ev_loop));
2569 loop_init (EV_A_ flags);
2570
2571 if (ev_backend (EV_A))
2572 return EV_A;
2573
2574 ev_free (EV_A);
2575 return 0;
2576}
2577
2578#endif /* multiplicity */
2579
2580#if EV_VERIFY
2581static void noinline ecb_cold
2582verify_watcher (EV_P_ W w)
2583{
2584 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2585
2586 if (w->pending)
2587 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2588}
2589
2590static void noinline ecb_cold
2591verify_heap (EV_P_ ANHE *heap, int N)
2592{
2593 int i;
2594
2595 for (i = HEAP0; i < N + HEAP0; ++i)
2596 {
2597 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2598 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2599 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2600
2601 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2602 }
2603}
2604
2605static void noinline ecb_cold
2606array_verify (EV_P_ W *ws, int cnt)
2607{
2608 while (cnt--)
2609 {
2610 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2611 verify_watcher (EV_A_ ws [cnt]);
2612 }
2613}
2614#endif
2615
2616#if EV_FEATURE_API
2617void ecb_cold
2618ev_verify (EV_P) EV_THROW
2619{
2620#if EV_VERIFY
2621 int i;
2622 WL w, w2;
2623
2624 assert (activecnt >= -1);
2625
2626 assert (fdchangemax >= fdchangecnt);
2627 for (i = 0; i < fdchangecnt; ++i)
2628 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2629
2630 assert (anfdmax >= 0);
2631 for (i = 0; i < anfdmax; ++i)
2632 {
2633 int j = 0;
2634
2635 for (w = w2 = anfds [i].head; w; w = w->next)
2636 {
2637 verify_watcher (EV_A_ (W)w);
2638
2639 if (j++ & 1)
2640 {
2641 assert (("libev: io watcher list contains a loop", w != w2));
2642 w2 = w2->next;
2643 }
2644
2645 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2646 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2647 }
2648 }
2649
2650 assert (timermax >= timercnt);
2651 verify_heap (EV_A_ timers, timercnt);
2652
2653#if EV_PERIODIC_ENABLE
2654 assert (periodicmax >= periodiccnt);
2655 verify_heap (EV_A_ periodics, periodiccnt);
2656#endif
2657
2658 for (i = NUMPRI; i--; )
2659 {
2660 assert (pendingmax [i] >= pendingcnt [i]);
2661#if EV_IDLE_ENABLE
2662 assert (idleall >= 0);
2663 assert (idlemax [i] >= idlecnt [i]);
2664 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2665#endif
2666 }
2667
2668#if EV_FORK_ENABLE
2669 assert (forkmax >= forkcnt);
2670 array_verify (EV_A_ (W *)forks, forkcnt);
2671#endif
2672
2673#if EV_CLEANUP_ENABLE
2674 assert (cleanupmax >= cleanupcnt);
2675 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2676#endif
2677
2678#if EV_ASYNC_ENABLE
2679 assert (asyncmax >= asynccnt);
2680 array_verify (EV_A_ (W *)asyncs, asynccnt);
2681#endif
2682
2683#if EV_PREPARE_ENABLE
2684 assert (preparemax >= preparecnt);
2685 array_verify (EV_A_ (W *)prepares, preparecnt);
2686#endif
2687
2688#if EV_CHECK_ENABLE
2689 assert (checkmax >= checkcnt);
2690 array_verify (EV_A_ (W *)checks, checkcnt);
2691#endif
2692
2693# if 0
2694#if EV_CHILD_ENABLE
2695 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2696 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2697#endif
2698# endif
2699#endif
2700}
2701#endif
2702
2703#if EV_MULTIPLICITY
2704struct ev_loop * ecb_cold
2705#else
2706int
2707#endif
2708ev_default_loop (unsigned int flags) EV_THROW
2709{
2710 if (!ev_default_loop_ptr)
2711 {
2712#if EV_MULTIPLICITY
2713 EV_P = ev_default_loop_ptr = &default_loop_struct;
2714#else
2715 ev_default_loop_ptr = 1;
2716#endif
2717
2718 loop_init (EV_A_ flags);
2719
2720 if (ev_backend (EV_A))
2721 {
2722#if EV_CHILD_ENABLE
2723 ev_signal_init (&childev, childcb, SIGCHLD);
2724 ev_set_priority (&childev, EV_MAXPRI);
2725 ev_signal_start (EV_A_ &childev);
2726 ev_unref (EV_A); /* child watcher should not keep loop alive */
2727#endif
2728 }
2729 else
2730 ev_default_loop_ptr = 0;
2731 }
2732
2733 return ev_default_loop_ptr;
2734}
2735
2736void
2737ev_loop_fork (EV_P) EV_THROW
2738{
2739 postfork = 1;
369} 2740}
370 2741
371/*****************************************************************************/ 2742/*****************************************************************************/
372 2743
373#if HAVE_EPOLL 2744void
374# include "ev_epoll.c" 2745ev_invoke (EV_P_ void *w, int revents)
2746{
2747 EV_CB_INVOKE ((W)w, revents);
2748}
2749
2750unsigned int
2751ev_pending_count (EV_P) EV_THROW
2752{
2753 int pri;
2754 unsigned int count = 0;
2755
2756 for (pri = NUMPRI; pri--; )
2757 count += pendingcnt [pri];
2758
2759 return count;
2760}
2761
2762void noinline
2763ev_invoke_pending (EV_P)
2764{
2765 pendingpri = NUMPRI;
2766
2767 while (pendingpri) /* pendingpri possibly gets modified in the inner loop */
2768 {
2769 --pendingpri;
2770
2771 while (pendingcnt [pendingpri])
2772 {
2773 ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
2774
2775 p->w->pending = 0;
2776 EV_CB_INVOKE (p->w, p->events);
2777 EV_FREQUENT_CHECK;
2778 }
2779 }
2780}
2781
2782#if EV_IDLE_ENABLE
2783/* make idle watchers pending. this handles the "call-idle */
2784/* only when higher priorities are idle" logic */
2785inline_size void
2786idle_reify (EV_P)
2787{
2788 if (expect_false (idleall))
2789 {
2790 int pri;
2791
2792 for (pri = NUMPRI; pri--; )
2793 {
2794 if (pendingcnt [pri])
2795 break;
2796
2797 if (idlecnt [pri])
2798 {
2799 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2800 break;
2801 }
2802 }
2803 }
2804}
2805#endif
2806
2807/* make timers pending */
2808inline_size void
2809timers_reify (EV_P)
2810{
2811 EV_FREQUENT_CHECK;
2812
2813 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2814 {
2815 do
2816 {
2817 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2818
2819 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2820
2821 /* first reschedule or stop timer */
2822 if (w->repeat)
2823 {
2824 ev_at (w) += w->repeat;
2825 if (ev_at (w) < mn_now)
2826 ev_at (w) = mn_now;
2827
2828 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2829
2830 ANHE_at_cache (timers [HEAP0]);
2831 downheap (timers, timercnt, HEAP0);
2832 }
2833 else
2834 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2835
2836 EV_FREQUENT_CHECK;
2837 feed_reverse (EV_A_ (W)w);
2838 }
2839 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2840
2841 feed_reverse_done (EV_A_ EV_TIMER);
2842 }
2843}
2844
2845#if EV_PERIODIC_ENABLE
2846
2847static void noinline
2848periodic_recalc (EV_P_ ev_periodic *w)
2849{
2850 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2851 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2852
2853 /* the above almost always errs on the low side */
2854 while (at <= ev_rt_now)
2855 {
2856 ev_tstamp nat = at + w->interval;
2857
2858 /* when resolution fails us, we use ev_rt_now */
2859 if (expect_false (nat == at))
2860 {
2861 at = ev_rt_now;
2862 break;
2863 }
2864
2865 at = nat;
2866 }
2867
2868 ev_at (w) = at;
2869}
2870
2871/* make periodics pending */
2872inline_size void
2873periodics_reify (EV_P)
2874{
2875 EV_FREQUENT_CHECK;
2876
2877 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2878 {
2879 do
2880 {
2881 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2882
2883 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2884
2885 /* first reschedule or stop timer */
2886 if (w->reschedule_cb)
2887 {
2888 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2889
2890 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2891
2892 ANHE_at_cache (periodics [HEAP0]);
2893 downheap (periodics, periodiccnt, HEAP0);
2894 }
2895 else if (w->interval)
2896 {
2897 periodic_recalc (EV_A_ w);
2898 ANHE_at_cache (periodics [HEAP0]);
2899 downheap (periodics, periodiccnt, HEAP0);
2900 }
2901 else
2902 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2903
2904 EV_FREQUENT_CHECK;
2905 feed_reverse (EV_A_ (W)w);
2906 }
2907 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2908
2909 feed_reverse_done (EV_A_ EV_PERIODIC);
2910 }
2911}
2912
2913/* simply recalculate all periodics */
2914/* TODO: maybe ensure that at least one event happens when jumping forward? */
2915static void noinline ecb_cold
2916periodics_reschedule (EV_P)
2917{
2918 int i;
2919
2920 /* adjust periodics after time jump */
2921 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2922 {
2923 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2924
2925 if (w->reschedule_cb)
2926 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2927 else if (w->interval)
2928 periodic_recalc (EV_A_ w);
2929
2930 ANHE_at_cache (periodics [i]);
2931 }
2932
2933 reheap (periodics, periodiccnt);
2934}
2935#endif
2936
2937/* adjust all timers by a given offset */
2938static void noinline ecb_cold
2939timers_reschedule (EV_P_ ev_tstamp adjust)
2940{
2941 int i;
2942
2943 for (i = 0; i < timercnt; ++i)
2944 {
2945 ANHE *he = timers + i + HEAP0;
2946 ANHE_w (*he)->at += adjust;
2947 ANHE_at_cache (*he);
2948 }
2949}
2950
2951/* fetch new monotonic and realtime times from the kernel */
2952/* also detect if there was a timejump, and act accordingly */
2953inline_speed void
2954time_update (EV_P_ ev_tstamp max_block)
2955{
2956#if EV_USE_MONOTONIC
2957 if (expect_true (have_monotonic))
2958 {
2959 int i;
2960 ev_tstamp odiff = rtmn_diff;
2961
2962 mn_now = get_clock ();
2963
2964 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2965 /* interpolate in the meantime */
2966 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2967 {
2968 ev_rt_now = rtmn_diff + mn_now;
2969 return;
2970 }
2971
2972 now_floor = mn_now;
2973 ev_rt_now = ev_time ();
2974
2975 /* loop a few times, before making important decisions.
2976 * on the choice of "4": one iteration isn't enough,
2977 * in case we get preempted during the calls to
2978 * ev_time and get_clock. a second call is almost guaranteed
2979 * to succeed in that case, though. and looping a few more times
2980 * doesn't hurt either as we only do this on time-jumps or
2981 * in the unlikely event of having been preempted here.
2982 */
2983 for (i = 4; --i; )
2984 {
2985 ev_tstamp diff;
2986 rtmn_diff = ev_rt_now - mn_now;
2987
2988 diff = odiff - rtmn_diff;
2989
2990 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2991 return; /* all is well */
2992
2993 ev_rt_now = ev_time ();
2994 mn_now = get_clock ();
2995 now_floor = mn_now;
2996 }
2997
2998 /* no timer adjustment, as the monotonic clock doesn't jump */
2999 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
3000# if EV_PERIODIC_ENABLE
3001 periodics_reschedule (EV_A);
375#endif 3002# endif
376#if HAVE_SELECT 3003 }
377# include "ev_select.c" 3004 else
378#endif 3005#endif
3006 {
3007 ev_rt_now = ev_time ();
3008
3009 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
3010 {
3011 /* adjust timers. this is easy, as the offset is the same for all of them */
3012 timers_reschedule (EV_A_ ev_rt_now - mn_now);
3013#if EV_PERIODIC_ENABLE
3014 periodics_reschedule (EV_A);
3015#endif
3016 }
3017
3018 mn_now = ev_rt_now;
3019 }
3020}
379 3021
380int 3022int
381ev_version_major (void) 3023ev_run (EV_P_ int flags)
382{ 3024{
383 return EV_VERSION_MAJOR; 3025#if EV_FEATURE_API
3026 ++loop_depth;
3027#endif
3028
3029 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
3030
3031 loop_done = EVBREAK_CANCEL;
3032
3033 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
3034
3035 do
3036 {
3037#if EV_VERIFY >= 2
3038 ev_verify (EV_A);
3039#endif
3040
3041#ifndef _WIN32
3042 if (expect_false (curpid)) /* penalise the forking check even more */
3043 if (expect_false (getpid () != curpid))
3044 {
3045 curpid = getpid ();
3046 postfork = 1;
3047 }
3048#endif
3049
3050#if EV_FORK_ENABLE
3051 /* we might have forked, so queue fork handlers */
3052 if (expect_false (postfork))
3053 if (forkcnt)
3054 {
3055 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
3056 EV_INVOKE_PENDING;
3057 }
3058#endif
3059
3060#if EV_PREPARE_ENABLE
3061 /* queue prepare watchers (and execute them) */
3062 if (expect_false (preparecnt))
3063 {
3064 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
3065 EV_INVOKE_PENDING;
3066 }
3067#endif
3068
3069 if (expect_false (loop_done))
3070 break;
3071
3072 /* we might have forked, so reify kernel state if necessary */
3073 if (expect_false (postfork))
3074 loop_fork (EV_A);
3075
3076 /* update fd-related kernel structures */
3077 fd_reify (EV_A);
3078
3079 /* calculate blocking time */
3080 {
3081 ev_tstamp waittime = 0.;
3082 ev_tstamp sleeptime = 0.;
3083
3084 /* remember old timestamp for io_blocktime calculation */
3085 ev_tstamp prev_mn_now = mn_now;
3086
3087 /* update time to cancel out callback processing overhead */
3088 time_update (EV_A_ 1e100);
3089
3090 /* from now on, we want a pipe-wake-up */
3091 pipe_write_wanted = 1;
3092
3093 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3094
3095 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3096 {
3097 waittime = MAX_BLOCKTIME;
3098
3099 if (timercnt)
3100 {
3101 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3102 if (waittime > to) waittime = to;
3103 }
3104
3105#if EV_PERIODIC_ENABLE
3106 if (periodiccnt)
3107 {
3108 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3109 if (waittime > to) waittime = to;
3110 }
3111#endif
3112
3113 /* don't let timeouts decrease the waittime below timeout_blocktime */
3114 if (expect_false (waittime < timeout_blocktime))
3115 waittime = timeout_blocktime;
3116
3117 /* at this point, we NEED to wait, so we have to ensure */
3118 /* to pass a minimum nonzero value to the backend */
3119 if (expect_false (waittime < backend_mintime))
3120 waittime = backend_mintime;
3121
3122 /* extra check because io_blocktime is commonly 0 */
3123 if (expect_false (io_blocktime))
3124 {
3125 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3126
3127 if (sleeptime > waittime - backend_mintime)
3128 sleeptime = waittime - backend_mintime;
3129
3130 if (expect_true (sleeptime > 0.))
3131 {
3132 ev_sleep (sleeptime);
3133 waittime -= sleeptime;
3134 }
3135 }
3136 }
3137
3138#if EV_FEATURE_API
3139 ++loop_count;
3140#endif
3141 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3142 backend_poll (EV_A_ waittime);
3143 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3144
3145 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3146
3147 ECB_MEMORY_FENCE_ACQUIRE;
3148 if (pipe_write_skipped)
3149 {
3150 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3151 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3152 }
3153
3154
3155 /* update ev_rt_now, do magic */
3156 time_update (EV_A_ waittime + sleeptime);
3157 }
3158
3159 /* queue pending timers and reschedule them */
3160 timers_reify (EV_A); /* relative timers called last */
3161#if EV_PERIODIC_ENABLE
3162 periodics_reify (EV_A); /* absolute timers called first */
3163#endif
3164
3165#if EV_IDLE_ENABLE
3166 /* queue idle watchers unless other events are pending */
3167 idle_reify (EV_A);
3168#endif
3169
3170#if EV_CHECK_ENABLE
3171 /* queue check watchers, to be executed first */
3172 if (expect_false (checkcnt))
3173 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3174#endif
3175
3176 EV_INVOKE_PENDING;
3177 }
3178 while (expect_true (
3179 activecnt
3180 && !loop_done
3181 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3182 ));
3183
3184 if (loop_done == EVBREAK_ONE)
3185 loop_done = EVBREAK_CANCEL;
3186
3187#if EV_FEATURE_API
3188 --loop_depth;
3189#endif
3190
3191 return activecnt;
3192}
3193
3194void
3195ev_break (EV_P_ int how) EV_THROW
3196{
3197 loop_done = how;
3198}
3199
3200void
3201ev_ref (EV_P) EV_THROW
3202{
3203 ++activecnt;
3204}
3205
3206void
3207ev_unref (EV_P) EV_THROW
3208{
3209 --activecnt;
3210}
3211
3212void
3213ev_now_update (EV_P) EV_THROW
3214{
3215 time_update (EV_A_ 1e100);
3216}
3217
3218void
3219ev_suspend (EV_P) EV_THROW
3220{
3221 ev_now_update (EV_A);
3222}
3223
3224void
3225ev_resume (EV_P) EV_THROW
3226{
3227 ev_tstamp mn_prev = mn_now;
3228
3229 ev_now_update (EV_A);
3230 timers_reschedule (EV_A_ mn_now - mn_prev);
3231#if EV_PERIODIC_ENABLE
3232 /* TODO: really do this? */
3233 periodics_reschedule (EV_A);
3234#endif
3235}
3236
3237/*****************************************************************************/
3238/* singly-linked list management, used when the expected list length is short */
3239
3240inline_size void
3241wlist_add (WL *head, WL elem)
3242{
3243 elem->next = *head;
3244 *head = elem;
3245}
3246
3247inline_size void
3248wlist_del (WL *head, WL elem)
3249{
3250 while (*head)
3251 {
3252 if (expect_true (*head == elem))
3253 {
3254 *head = elem->next;
3255 break;
3256 }
3257
3258 head = &(*head)->next;
3259 }
3260}
3261
3262/* internal, faster, version of ev_clear_pending */
3263inline_speed void
3264clear_pending (EV_P_ W w)
3265{
3266 if (w->pending)
3267 {
3268 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3269 w->pending = 0;
3270 }
384} 3271}
385 3272
386int 3273int
387ev_version_minor (void) 3274ev_clear_pending (EV_P_ void *w) EV_THROW
388{ 3275{
389 return EV_VERSION_MINOR; 3276 W w_ = (W)w;
390} 3277 int pending = w_->pending;
391 3278
392int ev_init (int flags) 3279 if (expect_true (pending))
393{ 3280 {
394 if (!ev_method) 3281 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3282 p->w = (W)&pending_w;
3283 w_->pending = 0;
3284 return p->events;
395 { 3285 }
396#if HAVE_MONOTONIC 3286 else
3287 return 0;
3288}
3289
3290inline_size void
3291pri_adjust (EV_P_ W w)
3292{
3293 int pri = ev_priority (w);
3294 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3295 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3296 ev_set_priority (w, pri);
3297}
3298
3299inline_speed void
3300ev_start (EV_P_ W w, int active)
3301{
3302 pri_adjust (EV_A_ w);
3303 w->active = active;
3304 ev_ref (EV_A);
3305}
3306
3307inline_size void
3308ev_stop (EV_P_ W w)
3309{
3310 ev_unref (EV_A);
3311 w->active = 0;
3312}
3313
3314/*****************************************************************************/
3315
3316void noinline
3317ev_io_start (EV_P_ ev_io *w) EV_THROW
3318{
3319 int fd = w->fd;
3320
3321 if (expect_false (ev_is_active (w)))
3322 return;
3323
3324 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3325 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3326
3327 EV_FREQUENT_CHECK;
3328
3329 ev_start (EV_A_ (W)w, 1);
3330 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3331 wlist_add (&anfds[fd].head, (WL)w);
3332
3333 /* common bug, apparently */
3334 assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
3335
3336 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3337 w->events &= ~EV__IOFDSET;
3338
3339 EV_FREQUENT_CHECK;
3340}
3341
3342void noinline
3343ev_io_stop (EV_P_ ev_io *w) EV_THROW
3344{
3345 clear_pending (EV_A_ (W)w);
3346 if (expect_false (!ev_is_active (w)))
3347 return;
3348
3349 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3350
3351 EV_FREQUENT_CHECK;
3352
3353 wlist_del (&anfds[w->fd].head, (WL)w);
3354 ev_stop (EV_A_ (W)w);
3355
3356 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3357
3358 EV_FREQUENT_CHECK;
3359}
3360
3361void noinline
3362ev_timer_start (EV_P_ ev_timer *w) EV_THROW
3363{
3364 if (expect_false (ev_is_active (w)))
3365 return;
3366
3367 ev_at (w) += mn_now;
3368
3369 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3370
3371 EV_FREQUENT_CHECK;
3372
3373 ++timercnt;
3374 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3375 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3376 ANHE_w (timers [ev_active (w)]) = (WT)w;
3377 ANHE_at_cache (timers [ev_active (w)]);
3378 upheap (timers, ev_active (w));
3379
3380 EV_FREQUENT_CHECK;
3381
3382 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3383}
3384
3385void noinline
3386ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
3387{
3388 clear_pending (EV_A_ (W)w);
3389 if (expect_false (!ev_is_active (w)))
3390 return;
3391
3392 EV_FREQUENT_CHECK;
3393
3394 {
3395 int active = ev_active (w);
3396
3397 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3398
3399 --timercnt;
3400
3401 if (expect_true (active < timercnt + HEAP0))
397 { 3402 {
398 struct timespec ts; 3403 timers [active] = timers [timercnt + HEAP0];
399 if (!clock_gettime (CLOCK_MONOTONIC, &ts)) 3404 adjustheap (timers, timercnt, active);
400 have_monotonic = 1;
401 } 3405 }
402#endif 3406 }
403 3407
404 ev_now = ev_time (); 3408 ev_at (w) -= mn_now;
405 now = get_clock ();
406 diff = ev_now - now;
407 3409
408 if (pipe (sigpipe)) 3410 ev_stop (EV_A_ (W)w);
409 return 0;
410 3411
411 ev_method = EVMETHOD_NONE; 3412 EV_FREQUENT_CHECK;
412#if HAVE_EPOLL 3413}
413 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
414#endif
415#if HAVE_SELECT
416 if (ev_method == EVMETHOD_NONE) select_init (flags);
417#endif
418 3414
419 if (ev_method) 3415void noinline
420 { 3416ev_timer_again (EV_P_ ev_timer *w) EV_THROW
421 evw_init (&sigev, sigcb); 3417{
422 siginit (); 3418 EV_FREQUENT_CHECK;
423 3419
424 evsignal_init (&childev, childcb, SIGCHLD); 3420 clear_pending (EV_A_ (W)w);
425 evsignal_start (&childev); 3421
426 } 3422 if (ev_is_active (w))
427 } 3423 {
428
429 return ev_method;
430}
431
432/*****************************************************************************/
433
434void
435ev_prefork (void)
436{
437 /* nop */
438}
439
440void
441ev_postfork_parent (void)
442{
443 /* nop */
444}
445
446void
447ev_postfork_child (void)
448{
449#if HAVE_EPOLL
450 if (ev_method == EVMETHOD_EPOLL)
451 epoll_postfork_child ();
452#endif
453
454 evio_stop (&sigev);
455 close (sigpipe [0]);
456 close (sigpipe [1]);
457 pipe (sigpipe);
458 siginit ();
459}
460
461/*****************************************************************************/
462
463static void
464fd_reify (void)
465{
466 int i;
467
468 for (i = 0; i < fdchangecnt; ++i)
469 {
470 int fd = fdchanges [i];
471 ANFD *anfd = anfds + fd;
472 struct ev_io *w;
473
474 int wev = 0;
475
476 for (w = anfd->head; w; w = w->next)
477 wev |= w->events;
478
479 if (anfd->wev != wev)
480 {
481 method_modify (fd, anfd->wev, wev);
482 anfd->wev = wev;
483 }
484 }
485
486 fdchangecnt = 0;
487}
488
489static void
490call_pending (void)
491{
492 while (pendingcnt)
493 {
494 ANPENDING *p = pendings + --pendingcnt;
495
496 if (p->w)
497 {
498 p->w->pending = 0;
499 p->w->cb (p->w, p->events);
500 }
501 }
502}
503
504static void
505timers_reify (void)
506{
507 while (timercnt && timers [0]->at <= now)
508 {
509 struct ev_timer *w = timers [0];
510
511 event ((W)w, EV_TIMEOUT);
512
513 /* first reschedule or stop timer */
514 if (w->repeat) 3424 if (w->repeat)
515 { 3425 {
516 w->at = now + w->repeat; 3426 ev_at (w) = mn_now + w->repeat;
517 assert (("timer timeout in the past, negative repeat?", w->at > now)); 3427 ANHE_at_cache (timers [ev_active (w)]);
518 downheap ((WT *)timers, timercnt, 0); 3428 adjustheap (timers, timercnt, ev_active (w));
519 } 3429 }
520 else 3430 else
521 evtimer_stop (w); /* nonrepeating: stop timer */ 3431 ev_timer_stop (EV_A_ w);
522 }
523}
524
525static void
526periodics_reify (void)
527{
528 while (periodiccnt && periodics [0]->at <= ev_now)
529 { 3432 }
530 struct ev_periodic *w = periodics [0]; 3433 else if (w->repeat)
3434 {
3435 ev_at (w) = w->repeat;
3436 ev_timer_start (EV_A_ w);
3437 }
531 3438
532 /* first reschedule or stop timer */ 3439 EV_FREQUENT_CHECK;
3440}
3441
3442ev_tstamp
3443ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
3444{
3445 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3446}
3447
3448#if EV_PERIODIC_ENABLE
3449void noinline
3450ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
3451{
3452 if (expect_false (ev_is_active (w)))
3453 return;
3454
3455 if (w->reschedule_cb)
3456 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
533 if (w->interval) 3457 else if (w->interval)
3458 {
3459 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3460 periodic_recalc (EV_A_ w);
3461 }
3462 else
3463 ev_at (w) = w->offset;
3464
3465 EV_FREQUENT_CHECK;
3466
3467 ++periodiccnt;
3468 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3469 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3470 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3471 ANHE_at_cache (periodics [ev_active (w)]);
3472 upheap (periodics, ev_active (w));
3473
3474 EV_FREQUENT_CHECK;
3475
3476 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3477}
3478
3479void noinline
3480ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
3481{
3482 clear_pending (EV_A_ (W)w);
3483 if (expect_false (!ev_is_active (w)))
3484 return;
3485
3486 EV_FREQUENT_CHECK;
3487
3488 {
3489 int active = ev_active (w);
3490
3491 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3492
3493 --periodiccnt;
3494
3495 if (expect_true (active < periodiccnt + HEAP0))
3496 {
3497 periodics [active] = periodics [periodiccnt + HEAP0];
3498 adjustheap (periodics, periodiccnt, active);
3499 }
3500 }
3501
3502 ev_stop (EV_A_ (W)w);
3503
3504 EV_FREQUENT_CHECK;
3505}
3506
3507void noinline
3508ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
3509{
3510 /* TODO: use adjustheap and recalculation */
3511 ev_periodic_stop (EV_A_ w);
3512 ev_periodic_start (EV_A_ w);
3513}
3514#endif
3515
3516#ifndef SA_RESTART
3517# define SA_RESTART 0
3518#endif
3519
3520#if EV_SIGNAL_ENABLE
3521
3522void noinline
3523ev_signal_start (EV_P_ ev_signal *w) EV_THROW
3524{
3525 if (expect_false (ev_is_active (w)))
3526 return;
3527
3528 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3529
3530#if EV_MULTIPLICITY
3531 assert (("libev: a signal must not be attached to two different loops",
3532 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3533
3534 signals [w->signum - 1].loop = EV_A;
3535#endif
3536
3537 EV_FREQUENT_CHECK;
3538
3539#if EV_USE_SIGNALFD
3540 if (sigfd == -2)
3541 {
3542 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3543 if (sigfd < 0 && errno == EINVAL)
3544 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3545
3546 if (sigfd >= 0)
534 { 3547 {
535 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 3548 fd_intern (sigfd); /* doing it twice will not hurt */
536 assert (("periodic timeout in the past, negative interval?", w->at > ev_now)); 3549
537 downheap ((WT *)periodics, periodiccnt, 0); 3550 sigemptyset (&sigfd_set);
3551
3552 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3553 ev_set_priority (&sigfd_w, EV_MAXPRI);
3554 ev_io_start (EV_A_ &sigfd_w);
3555 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3556 }
3557 }
3558
3559 if (sigfd >= 0)
3560 {
3561 /* TODO: check .head */
3562 sigaddset (&sigfd_set, w->signum);
3563 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3564
3565 signalfd (sigfd, &sigfd_set, 0);
3566 }
3567#endif
3568
3569 ev_start (EV_A_ (W)w, 1);
3570 wlist_add (&signals [w->signum - 1].head, (WL)w);
3571
3572 if (!((WL)w)->next)
3573# if EV_USE_SIGNALFD
3574 if (sigfd < 0) /*TODO*/
3575# endif
3576 {
3577# ifdef _WIN32
3578 evpipe_init (EV_A);
3579
3580 signal (w->signum, ev_sighandler);
3581# else
3582 struct sigaction sa;
3583
3584 evpipe_init (EV_A);
3585
3586 sa.sa_handler = ev_sighandler;
3587 sigfillset (&sa.sa_mask);
3588 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3589 sigaction (w->signum, &sa, 0);
3590
3591 if (origflags & EVFLAG_NOSIGMASK)
3592 {
3593 sigemptyset (&sa.sa_mask);
3594 sigaddset (&sa.sa_mask, w->signum);
3595 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3596 }
3597#endif
3598 }
3599
3600 EV_FREQUENT_CHECK;
3601}
3602
3603void noinline
3604ev_signal_stop (EV_P_ ev_signal *w) EV_THROW
3605{
3606 clear_pending (EV_A_ (W)w);
3607 if (expect_false (!ev_is_active (w)))
3608 return;
3609
3610 EV_FREQUENT_CHECK;
3611
3612 wlist_del (&signals [w->signum - 1].head, (WL)w);
3613 ev_stop (EV_A_ (W)w);
3614
3615 if (!signals [w->signum - 1].head)
3616 {
3617#if EV_MULTIPLICITY
3618 signals [w->signum - 1].loop = 0; /* unattach from signal */
3619#endif
3620#if EV_USE_SIGNALFD
3621 if (sigfd >= 0)
3622 {
3623 sigset_t ss;
3624
3625 sigemptyset (&ss);
3626 sigaddset (&ss, w->signum);
3627 sigdelset (&sigfd_set, w->signum);
3628
3629 signalfd (sigfd, &sigfd_set, 0);
3630 sigprocmask (SIG_UNBLOCK, &ss, 0);
538 } 3631 }
539 else 3632 else
540 evperiodic_stop (w); /* nonrepeating: stop timer */ 3633#endif
541 3634 signal (w->signum, SIG_DFL);
542 event ((W)w, EV_TIMEOUT);
543 }
544}
545
546static void
547periodics_reschedule (ev_tstamp diff)
548{
549 int i;
550
551 /* adjust periodics after time jump */
552 for (i = 0; i < periodiccnt; ++i)
553 { 3635 }
554 struct ev_periodic *w = periodics [i];
555 3636
556 if (w->interval) 3637 EV_FREQUENT_CHECK;
3638}
3639
3640#endif
3641
3642#if EV_CHILD_ENABLE
3643
3644void
3645ev_child_start (EV_P_ ev_child *w) EV_THROW
3646{
3647#if EV_MULTIPLICITY
3648 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3649#endif
3650 if (expect_false (ev_is_active (w)))
3651 return;
3652
3653 EV_FREQUENT_CHECK;
3654
3655 ev_start (EV_A_ (W)w, 1);
3656 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3657
3658 EV_FREQUENT_CHECK;
3659}
3660
3661void
3662ev_child_stop (EV_P_ ev_child *w) EV_THROW
3663{
3664 clear_pending (EV_A_ (W)w);
3665 if (expect_false (!ev_is_active (w)))
3666 return;
3667
3668 EV_FREQUENT_CHECK;
3669
3670 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3671 ev_stop (EV_A_ (W)w);
3672
3673 EV_FREQUENT_CHECK;
3674}
3675
3676#endif
3677
3678#if EV_STAT_ENABLE
3679
3680# ifdef _WIN32
3681# undef lstat
3682# define lstat(a,b) _stati64 (a,b)
3683# endif
3684
3685#define DEF_STAT_INTERVAL 5.0074891
3686#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3687#define MIN_STAT_INTERVAL 0.1074891
3688
3689static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3690
3691#if EV_USE_INOTIFY
3692
3693/* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3694# define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3695
3696static void noinline
3697infy_add (EV_P_ ev_stat *w)
3698{
3699 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);
3700
3701 if (w->wd >= 0)
3702 {
3703 struct statfs sfs;
3704
3705 /* now local changes will be tracked by inotify, but remote changes won't */
3706 /* unless the filesystem is known to be local, we therefore still poll */
3707 /* also do poll on <2.6.25, but with normal frequency */
3708
3709 if (!fs_2625)
3710 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3711 else if (!statfs (w->path, &sfs)
3712 && (sfs.f_type == 0x1373 /* devfs */
3713 || sfs.f_type == 0xEF53 /* ext2/3 */
3714 || sfs.f_type == 0x3153464a /* jfs */
3715 || sfs.f_type == 0x52654973 /* reiser3 */
3716 || sfs.f_type == 0x01021994 /* tempfs */
3717 || sfs.f_type == 0x58465342 /* xfs */))
3718 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3719 else
3720 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3721 }
3722 else
3723 {
3724 /* can't use inotify, continue to stat */
3725 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3726
3727 /* if path is not there, monitor some parent directory for speedup hints */
3728 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3729 /* but an efficiency issue only */
3730 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
557 { 3731 {
558 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 3732 char path [4096];
3733 strcpy (path, w->path);
559 3734
560 if (fabs (diff) >= 1e-4) 3735 do
561 { 3736 {
562 evperiodic_stop (w); 3737 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
563 evperiodic_start (w); 3738 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
564 3739
565 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 3740 char *pend = strrchr (path, '/');
3741
3742 if (!pend || pend == path)
3743 break;
3744
3745 *pend = 0;
3746 w->wd = inotify_add_watch (fs_fd, path, mask);
3747 }
3748 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3749 }
3750 }
3751
3752 if (w->wd >= 0)
3753 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3754
3755 /* now re-arm timer, if required */
3756 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3757 ev_timer_again (EV_A_ &w->timer);
3758 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3759}
3760
3761static void noinline
3762infy_del (EV_P_ ev_stat *w)
3763{
3764 int slot;
3765 int wd = w->wd;
3766
3767 if (wd < 0)
3768 return;
3769
3770 w->wd = -2;
3771 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3772 wlist_del (&fs_hash [slot].head, (WL)w);
3773
3774 /* remove this watcher, if others are watching it, they will rearm */
3775 inotify_rm_watch (fs_fd, wd);
3776}
3777
3778static void noinline
3779infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3780{
3781 if (slot < 0)
3782 /* overflow, need to check for all hash slots */
3783 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3784 infy_wd (EV_A_ slot, wd, ev);
3785 else
3786 {
3787 WL w_;
3788
3789 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3790 {
3791 ev_stat *w = (ev_stat *)w_;
3792 w_ = w_->next; /* lets us remove this watcher and all before it */
3793
3794 if (w->wd == wd || wd == -1)
3795 {
3796 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3797 {
3798 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3799 w->wd = -1;
3800 infy_add (EV_A_ w); /* re-add, no matter what */
3801 }
3802
3803 stat_timer_cb (EV_A_ &w->timer, 0);
566 } 3804 }
567 } 3805 }
568 } 3806 }
569} 3807}
570 3808
571static void 3809static void
572time_update (void) 3810infy_cb (EV_P_ ev_io *w, int revents)
573{ 3811{
3812 char buf [EV_INOTIFY_BUFSIZE];
574 int i; 3813 int ofs;
3814 int len = read (fs_fd, buf, sizeof (buf));
575 3815
576 ev_now = ev_time (); 3816 for (ofs = 0; ofs < len; )
577 3817 {
578 if (have_monotonic) 3818 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3819 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3820 ofs += sizeof (struct inotify_event) + ev->len;
579 { 3821 }
580 ev_tstamp odiff = diff; 3822}
581 3823
582 for (i = 4; --i; ) /* loop a few times, before making important decisions */ 3824inline_size void ecb_cold
3825ev_check_2625 (EV_P)
3826{
3827 /* kernels < 2.6.25 are borked
3828 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3829 */
3830 if (ev_linux_version () < 0x020619)
3831 return;
3832
3833 fs_2625 = 1;
3834}
3835
3836inline_size int
3837infy_newfd (void)
3838{
3839#if defined IN_CLOEXEC && defined IN_NONBLOCK
3840 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3841 if (fd >= 0)
3842 return fd;
3843#endif
3844 return inotify_init ();
3845}
3846
3847inline_size void
3848infy_init (EV_P)
3849{
3850 if (fs_fd != -2)
3851 return;
3852
3853 fs_fd = -1;
3854
3855 ev_check_2625 (EV_A);
3856
3857 fs_fd = infy_newfd ();
3858
3859 if (fs_fd >= 0)
3860 {
3861 fd_intern (fs_fd);
3862 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3863 ev_set_priority (&fs_w, EV_MAXPRI);
3864 ev_io_start (EV_A_ &fs_w);
3865 ev_unref (EV_A);
3866 }
3867}
3868
3869inline_size void
3870infy_fork (EV_P)
3871{
3872 int slot;
3873
3874 if (fs_fd < 0)
3875 return;
3876
3877 ev_ref (EV_A);
3878 ev_io_stop (EV_A_ &fs_w);
3879 close (fs_fd);
3880 fs_fd = infy_newfd ();
3881
3882 if (fs_fd >= 0)
3883 {
3884 fd_intern (fs_fd);
3885 ev_io_set (&fs_w, fs_fd, EV_READ);
3886 ev_io_start (EV_A_ &fs_w);
3887 ev_unref (EV_A);
3888 }
3889
3890 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3891 {
3892 WL w_ = fs_hash [slot].head;
3893 fs_hash [slot].head = 0;
3894
3895 while (w_)
583 { 3896 {
584 now = get_clock (); 3897 ev_stat *w = (ev_stat *)w_;
585 diff = ev_now - now; 3898 w_ = w_->next; /* lets us add this watcher */
586 3899
587 if (fabs (odiff - diff) < MIN_TIMEJUMP) 3900 w->wd = -1;
588 return; /* all is well */
589 3901
590 ev_now = ev_time (); 3902 if (fs_fd >= 0)
3903 infy_add (EV_A_ w); /* re-add, no matter what */
3904 else
3905 {
3906 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3907 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3908 ev_timer_again (EV_A_ &w->timer);
3909 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3910 }
591 } 3911 }
592
593 periodics_reschedule (diff - odiff);
594 /* no timer adjustment, as the monotonic clock doesn't jump */
595 } 3912 }
3913}
3914
3915#endif
3916
3917#ifdef _WIN32
3918# define EV_LSTAT(p,b) _stati64 (p, b)
3919#else
3920# define EV_LSTAT(p,b) lstat (p, b)
3921#endif
3922
3923void
3924ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
3925{
3926 if (lstat (w->path, &w->attr) < 0)
3927 w->attr.st_nlink = 0;
3928 else if (!w->attr.st_nlink)
3929 w->attr.st_nlink = 1;
3930}
3931
3932static void noinline
3933stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3934{
3935 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3936
3937 ev_statdata prev = w->attr;
3938 ev_stat_stat (EV_A_ w);
3939
3940 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3941 if (
3942 prev.st_dev != w->attr.st_dev
3943 || prev.st_ino != w->attr.st_ino
3944 || prev.st_mode != w->attr.st_mode
3945 || prev.st_nlink != w->attr.st_nlink
3946 || prev.st_uid != w->attr.st_uid
3947 || prev.st_gid != w->attr.st_gid
3948 || prev.st_rdev != w->attr.st_rdev
3949 || prev.st_size != w->attr.st_size
3950 || prev.st_atime != w->attr.st_atime
3951 || prev.st_mtime != w->attr.st_mtime
3952 || prev.st_ctime != w->attr.st_ctime
3953 ) {
3954 /* we only update w->prev on actual differences */
3955 /* in case we test more often than invoke the callback, */
3956 /* to ensure that prev is always different to attr */
3957 w->prev = prev;
3958
3959 #if EV_USE_INOTIFY
3960 if (fs_fd >= 0)
3961 {
3962 infy_del (EV_A_ w);
3963 infy_add (EV_A_ w);
3964 ev_stat_stat (EV_A_ w); /* avoid race... */
3965 }
3966 #endif
3967
3968 ev_feed_event (EV_A_ w, EV_STAT);
3969 }
3970}
3971
3972void
3973ev_stat_start (EV_P_ ev_stat *w) EV_THROW
3974{
3975 if (expect_false (ev_is_active (w)))
3976 return;
3977
3978 ev_stat_stat (EV_A_ w);
3979
3980 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3981 w->interval = MIN_STAT_INTERVAL;
3982
3983 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3984 ev_set_priority (&w->timer, ev_priority (w));
3985
3986#if EV_USE_INOTIFY
3987 infy_init (EV_A);
3988
3989 if (fs_fd >= 0)
3990 infy_add (EV_A_ w);
596 else 3991 else
3992#endif
3993 {
3994 ev_timer_again (EV_A_ &w->timer);
3995 ev_unref (EV_A);
597 { 3996 }
598 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) 3997
3998 ev_start (EV_A_ (W)w, 1);
3999
4000 EV_FREQUENT_CHECK;
4001}
4002
4003void
4004ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
4005{
4006 clear_pending (EV_A_ (W)w);
4007 if (expect_false (!ev_is_active (w)))
4008 return;
4009
4010 EV_FREQUENT_CHECK;
4011
4012#if EV_USE_INOTIFY
4013 infy_del (EV_A_ w);
4014#endif
4015
4016 if (ev_is_active (&w->timer))
4017 {
4018 ev_ref (EV_A);
4019 ev_timer_stop (EV_A_ &w->timer);
4020 }
4021
4022 ev_stop (EV_A_ (W)w);
4023
4024 EV_FREQUENT_CHECK;
4025}
4026#endif
4027
4028#if EV_IDLE_ENABLE
4029void
4030ev_idle_start (EV_P_ ev_idle *w) EV_THROW
4031{
4032 if (expect_false (ev_is_active (w)))
4033 return;
4034
4035 pri_adjust (EV_A_ (W)w);
4036
4037 EV_FREQUENT_CHECK;
4038
4039 {
4040 int active = ++idlecnt [ABSPRI (w)];
4041
4042 ++idleall;
4043 ev_start (EV_A_ (W)w, active);
4044
4045 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
4046 idles [ABSPRI (w)][active - 1] = w;
4047 }
4048
4049 EV_FREQUENT_CHECK;
4050}
4051
4052void
4053ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
4054{
4055 clear_pending (EV_A_ (W)w);
4056 if (expect_false (!ev_is_active (w)))
4057 return;
4058
4059 EV_FREQUENT_CHECK;
4060
4061 {
4062 int active = ev_active (w);
4063
4064 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
4065 ev_active (idles [ABSPRI (w)][active - 1]) = active;
4066
4067 ev_stop (EV_A_ (W)w);
4068 --idleall;
4069 }
4070
4071 EV_FREQUENT_CHECK;
4072}
4073#endif
4074
4075#if EV_PREPARE_ENABLE
4076void
4077ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
4078{
4079 if (expect_false (ev_is_active (w)))
4080 return;
4081
4082 EV_FREQUENT_CHECK;
4083
4084 ev_start (EV_A_ (W)w, ++preparecnt);
4085 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
4086 prepares [preparecnt - 1] = w;
4087
4088 EV_FREQUENT_CHECK;
4089}
4090
4091void
4092ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
4093{
4094 clear_pending (EV_A_ (W)w);
4095 if (expect_false (!ev_is_active (w)))
4096 return;
4097
4098 EV_FREQUENT_CHECK;
4099
4100 {
4101 int active = ev_active (w);
4102
4103 prepares [active - 1] = prepares [--preparecnt];
4104 ev_active (prepares [active - 1]) = active;
4105 }
4106
4107 ev_stop (EV_A_ (W)w);
4108
4109 EV_FREQUENT_CHECK;
4110}
4111#endif
4112
4113#if EV_CHECK_ENABLE
4114void
4115ev_check_start (EV_P_ ev_check *w) EV_THROW
4116{
4117 if (expect_false (ev_is_active (w)))
4118 return;
4119
4120 EV_FREQUENT_CHECK;
4121
4122 ev_start (EV_A_ (W)w, ++checkcnt);
4123 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4124 checks [checkcnt - 1] = w;
4125
4126 EV_FREQUENT_CHECK;
4127}
4128
4129void
4130ev_check_stop (EV_P_ ev_check *w) EV_THROW
4131{
4132 clear_pending (EV_A_ (W)w);
4133 if (expect_false (!ev_is_active (w)))
4134 return;
4135
4136 EV_FREQUENT_CHECK;
4137
4138 {
4139 int active = ev_active (w);
4140
4141 checks [active - 1] = checks [--checkcnt];
4142 ev_active (checks [active - 1]) = active;
4143 }
4144
4145 ev_stop (EV_A_ (W)w);
4146
4147 EV_FREQUENT_CHECK;
4148}
4149#endif
4150
4151#if EV_EMBED_ENABLE
4152void noinline
4153ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
4154{
4155 ev_run (w->other, EVRUN_NOWAIT);
4156}
4157
4158static void
4159embed_io_cb (EV_P_ ev_io *io, int revents)
4160{
4161 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4162
4163 if (ev_cb (w))
4164 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4165 else
4166 ev_run (w->other, EVRUN_NOWAIT);
4167}
4168
4169static void
4170embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4171{
4172 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4173
4174 {
4175 EV_P = w->other;
4176
4177 while (fdchangecnt)
599 { 4178 {
600 periodics_reschedule (ev_now - now); 4179 fd_reify (EV_A);
601 4180 ev_run (EV_A_ EVRUN_NOWAIT);
602 /* adjust timers. this is easy, as the offset is the same for all */
603 for (i = 0; i < timercnt; ++i)
604 timers [i]->at += diff;
605 } 4181 }
606
607 now = ev_now;
608 } 4182 }
609} 4183}
610 4184
611int ev_loop_done; 4185static void
612 4186embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
613void ev_loop (int flags)
614{ 4187{
615 double block; 4188 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
616 ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
617 4189
618 do 4190 ev_embed_stop (EV_A_ w);
4191
619 { 4192 {
620 /* queue check watchers (and execute them) */ 4193 EV_P = w->other;
621 if (preparecnt)
622 {
623 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
624 call_pending ();
625 }
626 4194
627 /* update fd-related kernel structures */ 4195 ev_loop_fork (EV_A);
628 fd_reify (); 4196 ev_run (EV_A_ EVRUN_NOWAIT);
629
630 /* calculate blocking time */
631
632 /* we only need this for !monotonic clockor timers, but as we basically
633 always have timers, we just calculate it always */
634 ev_now = ev_time ();
635
636 if (flags & EVLOOP_NONBLOCK || idlecnt)
637 block = 0.;
638 else
639 {
640 block = MAX_BLOCKTIME;
641
642 if (timercnt)
643 {
644 ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
645 if (block > to) block = to;
646 }
647
648 if (periodiccnt)
649 {
650 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
651 if (block > to) block = to;
652 }
653
654 if (block < 0.) block = 0.;
655 }
656
657 method_poll (block);
658
659 /* update ev_now, do magic */
660 time_update ();
661
662 /* queue pending timers and reschedule them */
663 timers_reify (); /* relative timers called last */
664 periodics_reify (); /* absolute timers called first */
665
666 /* queue idle watchers unless io or timers are pending */
667 if (!pendingcnt)
668 queue_events ((W *)idles, idlecnt, EV_IDLE);
669
670 /* queue check watchers, to be executed first */
671 if (checkcnt)
672 queue_events ((W *)checks, checkcnt, EV_CHECK);
673
674 call_pending ();
675 } 4197 }
676 while (!ev_loop_done);
677 4198
678 if (ev_loop_done != 2) 4199 ev_embed_start (EV_A_ w);
679 ev_loop_done = 0;
680} 4200}
4201
4202#if 0
4203static void
4204embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4205{
4206 ev_idle_stop (EV_A_ idle);
4207}
4208#endif
4209
4210void
4211ev_embed_start (EV_P_ ev_embed *w) EV_THROW
4212{
4213 if (expect_false (ev_is_active (w)))
4214 return;
4215
4216 {
4217 EV_P = w->other;
4218 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4219 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4220 }
4221
4222 EV_FREQUENT_CHECK;
4223
4224 ev_set_priority (&w->io, ev_priority (w));
4225 ev_io_start (EV_A_ &w->io);
4226
4227 ev_prepare_init (&w->prepare, embed_prepare_cb);
4228 ev_set_priority (&w->prepare, EV_MINPRI);
4229 ev_prepare_start (EV_A_ &w->prepare);
4230
4231 ev_fork_init (&w->fork, embed_fork_cb);
4232 ev_fork_start (EV_A_ &w->fork);
4233
4234 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4235
4236 ev_start (EV_A_ (W)w, 1);
4237
4238 EV_FREQUENT_CHECK;
4239}
4240
4241void
4242ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
4243{
4244 clear_pending (EV_A_ (W)w);
4245 if (expect_false (!ev_is_active (w)))
4246 return;
4247
4248 EV_FREQUENT_CHECK;
4249
4250 ev_io_stop (EV_A_ &w->io);
4251 ev_prepare_stop (EV_A_ &w->prepare);
4252 ev_fork_stop (EV_A_ &w->fork);
4253
4254 ev_stop (EV_A_ (W)w);
4255
4256 EV_FREQUENT_CHECK;
4257}
4258#endif
4259
4260#if EV_FORK_ENABLE
4261void
4262ev_fork_start (EV_P_ ev_fork *w) EV_THROW
4263{
4264 if (expect_false (ev_is_active (w)))
4265 return;
4266
4267 EV_FREQUENT_CHECK;
4268
4269 ev_start (EV_A_ (W)w, ++forkcnt);
4270 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4271 forks [forkcnt - 1] = w;
4272
4273 EV_FREQUENT_CHECK;
4274}
4275
4276void
4277ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
4278{
4279 clear_pending (EV_A_ (W)w);
4280 if (expect_false (!ev_is_active (w)))
4281 return;
4282
4283 EV_FREQUENT_CHECK;
4284
4285 {
4286 int active = ev_active (w);
4287
4288 forks [active - 1] = forks [--forkcnt];
4289 ev_active (forks [active - 1]) = active;
4290 }
4291
4292 ev_stop (EV_A_ (W)w);
4293
4294 EV_FREQUENT_CHECK;
4295}
4296#endif
4297
4298#if EV_CLEANUP_ENABLE
4299void
4300ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
4301{
4302 if (expect_false (ev_is_active (w)))
4303 return;
4304
4305 EV_FREQUENT_CHECK;
4306
4307 ev_start (EV_A_ (W)w, ++cleanupcnt);
4308 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4309 cleanups [cleanupcnt - 1] = w;
4310
4311 /* cleanup watchers should never keep a refcount on the loop */
4312 ev_unref (EV_A);
4313 EV_FREQUENT_CHECK;
4314}
4315
4316void
4317ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
4318{
4319 clear_pending (EV_A_ (W)w);
4320 if (expect_false (!ev_is_active (w)))
4321 return;
4322
4323 EV_FREQUENT_CHECK;
4324 ev_ref (EV_A);
4325
4326 {
4327 int active = ev_active (w);
4328
4329 cleanups [active - 1] = cleanups [--cleanupcnt];
4330 ev_active (cleanups [active - 1]) = active;
4331 }
4332
4333 ev_stop (EV_A_ (W)w);
4334
4335 EV_FREQUENT_CHECK;
4336}
4337#endif
4338
4339#if EV_ASYNC_ENABLE
4340void
4341ev_async_start (EV_P_ ev_async *w) EV_THROW
4342{
4343 if (expect_false (ev_is_active (w)))
4344 return;
4345
4346 w->sent = 0;
4347
4348 evpipe_init (EV_A);
4349
4350 EV_FREQUENT_CHECK;
4351
4352 ev_start (EV_A_ (W)w, ++asynccnt);
4353 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4354 asyncs [asynccnt - 1] = w;
4355
4356 EV_FREQUENT_CHECK;
4357}
4358
4359void
4360ev_async_stop (EV_P_ ev_async *w) EV_THROW
4361{
4362 clear_pending (EV_A_ (W)w);
4363 if (expect_false (!ev_is_active (w)))
4364 return;
4365
4366 EV_FREQUENT_CHECK;
4367
4368 {
4369 int active = ev_active (w);
4370
4371 asyncs [active - 1] = asyncs [--asynccnt];
4372 ev_active (asyncs [active - 1]) = active;
4373 }
4374
4375 ev_stop (EV_A_ (W)w);
4376
4377 EV_FREQUENT_CHECK;
4378}
4379
4380void
4381ev_async_send (EV_P_ ev_async *w) EV_THROW
4382{
4383 w->sent = 1;
4384 evpipe_write (EV_A_ &async_pending);
4385}
4386#endif
681 4387
682/*****************************************************************************/ 4388/*****************************************************************************/
683 4389
684static void
685wlist_add (WL *head, WL elem)
686{
687 elem->next = *head;
688 *head = elem;
689}
690
691static void
692wlist_del (WL *head, WL elem)
693{
694 while (*head)
695 {
696 if (*head == elem)
697 {
698 *head = elem->next;
699 return;
700 }
701
702 head = &(*head)->next;
703 }
704}
705
706static void
707ev_clear (W w)
708{
709 if (w->pending)
710 {
711 pendings [w->pending - 1].w = 0;
712 w->pending = 0;
713 }
714}
715
716static void
717ev_start (W w, int active)
718{
719 w->active = active;
720}
721
722static void
723ev_stop (W w)
724{
725 w->active = 0;
726}
727
728/*****************************************************************************/
729
730void
731evio_start (struct ev_io *w)
732{
733 if (ev_is_active (w))
734 return;
735
736 int fd = w->fd;
737
738 ev_start ((W)w, 1);
739 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
740 wlist_add ((WL *)&anfds[fd].head, (WL)w);
741
742 ++fdchangecnt;
743 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
744 fdchanges [fdchangecnt - 1] = fd;
745
746 if (w->fd == 9)
747 printf ("start %p:%x\n", w, w->events);//D
748}
749
750void
751evio_stop (struct ev_io *w)
752{
753 if (w->fd == 9)
754 printf ("stop %p:%x\n", w, w->events);//D
755 ev_clear ((W)w);
756 if (!ev_is_active (w))
757 return;
758
759 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
760 ev_stop ((W)w);
761
762 ++fdchangecnt;
763 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
764 fdchanges [fdchangecnt - 1] = w->fd;
765}
766
767void
768evtimer_start (struct ev_timer *w)
769{
770 if (ev_is_active (w))
771 return;
772
773 w->at += now;
774
775 assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
776
777 ev_start ((W)w, ++timercnt);
778 array_needsize (timers, timermax, timercnt, );
779 timers [timercnt - 1] = w;
780 upheap ((WT *)timers, timercnt - 1);
781}
782
783void
784evtimer_stop (struct ev_timer *w)
785{
786 ev_clear ((W)w);
787 if (!ev_is_active (w))
788 return;
789
790 if (w->active < timercnt--)
791 {
792 timers [w->active - 1] = timers [timercnt];
793 downheap ((WT *)timers, timercnt, w->active - 1);
794 }
795
796 w->at = w->repeat;
797
798 ev_stop ((W)w);
799}
800
801void
802evtimer_again (struct ev_timer *w)
803{
804 if (ev_is_active (w))
805 {
806 if (w->repeat)
807 {
808 w->at = now + w->repeat;
809 downheap ((WT *)timers, timercnt, w->active - 1);
810 }
811 else
812 evtimer_stop (w);
813 }
814 else if (w->repeat)
815 evtimer_start (w);
816}
817
818void
819evperiodic_start (struct ev_periodic *w)
820{
821 if (ev_is_active (w))
822 return;
823
824 assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
825
826 /* this formula differs from the one in periodic_reify because we do not always round up */
827 if (w->interval)
828 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
829
830 ev_start ((W)w, ++periodiccnt);
831 array_needsize (periodics, periodicmax, periodiccnt, );
832 periodics [periodiccnt - 1] = w;
833 upheap ((WT *)periodics, periodiccnt - 1);
834}
835
836void
837evperiodic_stop (struct ev_periodic *w)
838{
839 ev_clear ((W)w);
840 if (!ev_is_active (w))
841 return;
842
843 if (w->active < periodiccnt--)
844 {
845 periodics [w->active - 1] = periodics [periodiccnt];
846 downheap ((WT *)periodics, periodiccnt, w->active - 1);
847 }
848
849 ev_stop ((W)w);
850}
851
852void
853evsignal_start (struct ev_signal *w)
854{
855 if (ev_is_active (w))
856 return;
857
858 ev_start ((W)w, 1);
859 array_needsize (signals, signalmax, w->signum, signals_init);
860 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
861
862 if (!w->next)
863 {
864 struct sigaction sa;
865 sa.sa_handler = sighandler;
866 sigfillset (&sa.sa_mask);
867 sa.sa_flags = 0;
868 sigaction (w->signum, &sa, 0);
869 }
870}
871
872void
873evsignal_stop (struct ev_signal *w)
874{
875 ev_clear ((W)w);
876 if (!ev_is_active (w))
877 return;
878
879 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
880 ev_stop ((W)w);
881
882 if (!signals [w->signum - 1].head)
883 signal (w->signum, SIG_DFL);
884}
885
886void evidle_start (struct ev_idle *w)
887{
888 if (ev_is_active (w))
889 return;
890
891 ev_start ((W)w, ++idlecnt);
892 array_needsize (idles, idlemax, idlecnt, );
893 idles [idlecnt - 1] = w;
894}
895
896void evidle_stop (struct ev_idle *w)
897{
898 ev_clear ((W)w);
899 if (ev_is_active (w))
900 return;
901
902 idles [w->active - 1] = idles [--idlecnt];
903 ev_stop ((W)w);
904}
905
906void evprepare_start (struct ev_prepare *w)
907{
908 if (ev_is_active (w))
909 return;
910
911 ev_start ((W)w, ++preparecnt);
912 array_needsize (prepares, preparemax, preparecnt, );
913 prepares [preparecnt - 1] = w;
914}
915
916void evprepare_stop (struct ev_prepare *w)
917{
918 ev_clear ((W)w);
919 if (ev_is_active (w))
920 return;
921
922 prepares [w->active - 1] = prepares [--preparecnt];
923 ev_stop ((W)w);
924}
925
926void evcheck_start (struct ev_check *w)
927{
928 if (ev_is_active (w))
929 return;
930
931 ev_start ((W)w, ++checkcnt);
932 array_needsize (checks, checkmax, checkcnt, );
933 checks [checkcnt - 1] = w;
934}
935
936void evcheck_stop (struct ev_check *w)
937{
938 ev_clear ((W)w);
939 if (ev_is_active (w))
940 return;
941
942 checks [w->active - 1] = checks [--checkcnt];
943 ev_stop ((W)w);
944}
945
946void evchild_start (struct ev_child *w)
947{
948 if (ev_is_active (w))
949 return;
950
951 ev_start ((W)w, 1);
952 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
953}
954
955void evchild_stop (struct ev_child *w)
956{
957 ev_clear ((W)w);
958 if (ev_is_active (w))
959 return;
960
961 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
962 ev_stop ((W)w);
963}
964
965/*****************************************************************************/
966
967struct ev_once 4390struct ev_once
968{ 4391{
969 struct ev_io io; 4392 ev_io io;
970 struct ev_timer to; 4393 ev_timer to;
971 void (*cb)(int revents, void *arg); 4394 void (*cb)(int revents, void *arg);
972 void *arg; 4395 void *arg;
973}; 4396};
974 4397
975static void 4398static void
976once_cb (struct ev_once *once, int revents) 4399once_cb (EV_P_ struct ev_once *once, int revents)
977{ 4400{
978 void (*cb)(int revents, void *arg) = once->cb; 4401 void (*cb)(int revents, void *arg) = once->cb;
979 void *arg = once->arg; 4402 void *arg = once->arg;
980 4403
981 evio_stop (&once->io); 4404 ev_io_stop (EV_A_ &once->io);
982 evtimer_stop (&once->to); 4405 ev_timer_stop (EV_A_ &once->to);
983 free (once); 4406 ev_free (once);
984 4407
985 cb (revents, arg); 4408 cb (revents, arg);
986} 4409}
987 4410
988static void 4411static void
989once_cb_io (struct ev_io *w, int revents) 4412once_cb_io (EV_P_ ev_io *w, int revents)
990{ 4413{
991 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents); 4414 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4415
4416 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
992} 4417}
993 4418
994static void 4419static void
995once_cb_to (struct ev_timer *w, int revents) 4420once_cb_to (EV_P_ ev_timer *w, int revents)
996{ 4421{
997 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents); 4422 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4423
4424 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
998} 4425}
999 4426
1000void 4427void
1001ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) 4428ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
1002{ 4429{
1003 struct ev_once *once = malloc (sizeof (struct ev_once)); 4430 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
1004 4431
1005 if (!once) 4432 if (expect_false (!once))
1006 cb (EV_ERROR, arg); 4433 {
1007 else 4434 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4435 return;
1008 { 4436 }
4437
1009 once->cb = cb; 4438 once->cb = cb;
1010 once->arg = arg; 4439 once->arg = arg;
1011 4440
1012 evw_init (&once->io, once_cb_io); 4441 ev_init (&once->io, once_cb_io);
1013
1014 if (fd >= 0) 4442 if (fd >= 0)
4443 {
4444 ev_io_set (&once->io, fd, events);
4445 ev_io_start (EV_A_ &once->io);
4446 }
4447
4448 ev_init (&once->to, once_cb_to);
4449 if (timeout >= 0.)
4450 {
4451 ev_timer_set (&once->to, timeout, 0.);
4452 ev_timer_start (EV_A_ &once->to);
4453 }
4454}
4455
4456/*****************************************************************************/
4457
4458#if EV_WALK_ENABLE
4459void ecb_cold
4460ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
4461{
4462 int i, j;
4463 ev_watcher_list *wl, *wn;
4464
4465 if (types & (EV_IO | EV_EMBED))
4466 for (i = 0; i < anfdmax; ++i)
4467 for (wl = anfds [i].head; wl; )
1015 { 4468 {
1016 evio_set (&once->io, fd, events); 4469 wn = wl->next;
1017 evio_start (&once->io); 4470
4471#if EV_EMBED_ENABLE
4472 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4473 {
4474 if (types & EV_EMBED)
4475 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4476 }
4477 else
4478#endif
4479#if EV_USE_INOTIFY
4480 if (ev_cb ((ev_io *)wl) == infy_cb)
4481 ;
4482 else
4483#endif
4484 if ((ev_io *)wl != &pipe_w)
4485 if (types & EV_IO)
4486 cb (EV_A_ EV_IO, wl);
4487
4488 wl = wn;
1018 } 4489 }
1019 4490
1020 evw_init (&once->to, once_cb_to); 4491 if (types & (EV_TIMER | EV_STAT))
1021 4492 for (i = timercnt + HEAP0; i-- > HEAP0; )
1022 if (timeout >= 0.) 4493#if EV_STAT_ENABLE
4494 /*TODO: timer is not always active*/
4495 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
1023 { 4496 {
1024 evtimer_set (&once->to, timeout, 0.); 4497 if (types & EV_STAT)
1025 evtimer_start (&once->to); 4498 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
1026 } 4499 }
1027 } 4500 else
1028} 4501#endif
4502 if (types & EV_TIMER)
4503 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
1029 4504
1030/*****************************************************************************/ 4505#if EV_PERIODIC_ENABLE
4506 if (types & EV_PERIODIC)
4507 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4508 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4509#endif
1031 4510
1032#if 0 4511#if EV_IDLE_ENABLE
4512 if (types & EV_IDLE)
4513 for (j = NUMPRI; j--; )
4514 for (i = idlecnt [j]; i--; )
4515 cb (EV_A_ EV_IDLE, idles [j][i]);
4516#endif
1033 4517
1034struct ev_io wio; 4518#if EV_FORK_ENABLE
4519 if (types & EV_FORK)
4520 for (i = forkcnt; i--; )
4521 if (ev_cb (forks [i]) != embed_fork_cb)
4522 cb (EV_A_ EV_FORK, forks [i]);
4523#endif
1035 4524
1036static void 4525#if EV_ASYNC_ENABLE
1037sin_cb (struct ev_io *w, int revents) 4526 if (types & EV_ASYNC)
1038{ 4527 for (i = asynccnt; i--; )
1039 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); 4528 cb (EV_A_ EV_ASYNC, asyncs [i]);
1040} 4529#endif
1041 4530
1042static void 4531#if EV_PREPARE_ENABLE
1043ocb (struct ev_timer *w, int revents) 4532 if (types & EV_PREPARE)
1044{ 4533 for (i = preparecnt; i--; )
1045 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); 4534# if EV_EMBED_ENABLE
1046 evtimer_stop (w); 4535 if (ev_cb (prepares [i]) != embed_prepare_cb)
1047 evtimer_start (w);
1048}
1049
1050static void
1051scb (struct ev_signal *w, int revents)
1052{
1053 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
1054 evio_stop (&wio);
1055 evio_start (&wio);
1056}
1057
1058static void
1059gcb (struct ev_signal *w, int revents)
1060{
1061 fprintf (stderr, "generic %x\n", revents);
1062
1063}
1064
1065int main (void)
1066{
1067 ev_init (0);
1068
1069 evio_init (&wio, sin_cb, 0, EV_READ);
1070 evio_start (&wio);
1071
1072 struct ev_timer t[10000];
1073
1074#if 0
1075 int i;
1076 for (i = 0; i < 10000; ++i)
1077 {
1078 struct ev_timer *w = t + i;
1079 evw_init (w, ocb, i);
1080 evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
1081 evtimer_start (w);
1082 if (drand48 () < 0.5)
1083 evtimer_stop (w);
1084 }
1085#endif 4536# endif
1086 4537 cb (EV_A_ EV_PREPARE, prepares [i]);
1087 struct ev_timer t1;
1088 evtimer_init (&t1, ocb, 5, 10);
1089 evtimer_start (&t1);
1090
1091 struct ev_signal sig;
1092 evsignal_init (&sig, scb, SIGQUIT);
1093 evsignal_start (&sig);
1094
1095 struct ev_check cw;
1096 evcheck_init (&cw, gcb);
1097 evcheck_start (&cw);
1098
1099 struct ev_idle iw;
1100 evidle_init (&iw, gcb);
1101 evidle_start (&iw);
1102
1103 ev_loop (0);
1104
1105 return 0;
1106}
1107
1108#endif 4538#endif
1109 4539
4540#if EV_CHECK_ENABLE
4541 if (types & EV_CHECK)
4542 for (i = checkcnt; i--; )
4543 cb (EV_A_ EV_CHECK, checks [i]);
4544#endif
1110 4545
4546#if EV_SIGNAL_ENABLE
4547 if (types & EV_SIGNAL)
4548 for (i = 0; i < EV_NSIG - 1; ++i)
4549 for (wl = signals [i].head; wl; )
4550 {
4551 wn = wl->next;
4552 cb (EV_A_ EV_SIGNAL, wl);
4553 wl = wn;
4554 }
4555#endif
1111 4556
4557#if EV_CHILD_ENABLE
4558 if (types & EV_CHILD)
4559 for (i = (EV_PID_HASHSIZE); i--; )
4560 for (wl = childs [i]; wl; )
4561 {
4562 wn = wl->next;
4563 cb (EV_A_ EV_CHILD, wl);
4564 wl = wn;
4565 }
4566#endif
4567/* EV_STAT 0x00001000 /* stat data changed */
4568/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4569}
4570#endif
1112 4571
4572#if EV_MULTIPLICITY
4573 #include "ev_wrap.h"
4574#endif
4575

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