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Comparing libev/ev.c (file contents):
Revision 1.12 by root, Wed Oct 31 09:23:17 2007 UTC vs.
Revision 1.358 by root, Sun Oct 24 14:44:40 2010 UTC

1/*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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.
38 */
39
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_CLOCK_SYSCALL
49# ifndef EV_USE_CLOCK_SYSCALL
50# define EV_USE_CLOCK_SYSCALL 1
51# ifndef EV_USE_REALTIME
52# define EV_USE_REALTIME 0
53# endif
54# ifndef EV_USE_MONOTONIC
55# define EV_USE_MONOTONIC 1
56# endif
57# endif
58# elif !defined(EV_USE_CLOCK_SYSCALL)
59# define EV_USE_CLOCK_SYSCALL 0
60# endif
61
62# if HAVE_CLOCK_GETTIME
63# ifndef EV_USE_MONOTONIC
64# define EV_USE_MONOTONIC 1
65# endif
66# ifndef EV_USE_REALTIME
67# define EV_USE_REALTIME 0
68# endif
69# else
70# ifndef EV_USE_MONOTONIC
71# define EV_USE_MONOTONIC 0
72# endif
73# ifndef EV_USE_REALTIME
74# define EV_USE_REALTIME 0
75# endif
76# endif
77
78# if HAVE_NANOSLEEP
79# ifndef EV_USE_NANOSLEEP
80# define EV_USE_NANOSLEEP EV_FEATURE_OS
81# endif
82# else
83# undef EV_USE_NANOSLEEP
84# define EV_USE_NANOSLEEP 0
85# endif
86
87# if HAVE_SELECT && HAVE_SYS_SELECT_H
88# ifndef EV_USE_SELECT
89# define EV_USE_SELECT EV_FEATURE_BACKENDS
90# endif
91# else
92# undef EV_USE_SELECT
93# define EV_USE_SELECT 0
94# endif
95
96# if HAVE_POLL && HAVE_POLL_H
97# ifndef EV_USE_POLL
98# define EV_USE_POLL EV_FEATURE_BACKENDS
99# endif
100# else
101# undef EV_USE_POLL
102# define EV_USE_POLL 0
103# endif
104
105# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
106# ifndef EV_USE_EPOLL
107# define EV_USE_EPOLL EV_FEATURE_BACKENDS
108# endif
109# else
110# undef EV_USE_EPOLL
111# define EV_USE_EPOLL 0
112# endif
113
114# if HAVE_KQUEUE && HAVE_SYS_EVENT_H
115# ifndef EV_USE_KQUEUE
116# define EV_USE_KQUEUE EV_FEATURE_BACKENDS
117# endif
118# else
119# undef EV_USE_KQUEUE
120# define EV_USE_KQUEUE 0
121# endif
122
123# if HAVE_PORT_H && HAVE_PORT_CREATE
124# ifndef EV_USE_PORT
125# define EV_USE_PORT EV_FEATURE_BACKENDS
126# endif
127# else
128# undef EV_USE_PORT
129# define EV_USE_PORT 0
130# endif
131
132# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
133# ifndef EV_USE_INOTIFY
134# define EV_USE_INOTIFY EV_FEATURE_OS
135# endif
136# else
137# undef EV_USE_INOTIFY
138# define EV_USE_INOTIFY 0
139# endif
140
141# if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
142# ifndef EV_USE_SIGNALFD
143# define EV_USE_SIGNALFD EV_FEATURE_OS
144# endif
145# else
146# undef EV_USE_SIGNALFD
147# define EV_USE_SIGNALFD 0
148# endif
149
150# if HAVE_EVENTFD
151# ifndef EV_USE_EVENTFD
152# define EV_USE_EVENTFD EV_FEATURE_OS
153# endif
154# else
155# undef EV_USE_EVENTFD
156# define EV_USE_EVENTFD 0
157# endif
158
159#endif
160
1#include <math.h> 161#include <math.h>
2#include <stdlib.h> 162#include <stdlib.h>
3#include <unistd.h> 163#include <string.h>
4#include <fcntl.h> 164#include <fcntl.h>
5#include <signal.h> 165#include <stddef.h>
6 166
7#include <stdio.h> 167#include <stdio.h>
8 168
9#include <assert.h> 169#include <assert.h>
10#include <errno.h> 170#include <errno.h>
11#include <sys/time.h> 171#include <sys/types.h>
12#include <time.h> 172#include <time.h>
173#include <limits.h>
13 174
14#define HAVE_EPOLL 1 175#include <signal.h>
15 176
16#ifndef HAVE_MONOTONIC 177#ifdef EV_H
17# ifdef CLOCK_MONOTONIC 178# include EV_H
18# define HAVE_MONOTONIC 1 179#else
180# include "ev.h"
181#endif
182
183EV_CPP(extern "C" {)
184
185#ifndef _WIN32
186# include <sys/time.h>
187# include <sys/wait.h>
188# include <unistd.h>
189#else
190# include <io.h>
191# define WIN32_LEAN_AND_MEAN
192# include <windows.h>
193# ifndef EV_SELECT_IS_WINSOCKET
194# define EV_SELECT_IS_WINSOCKET 1
19# endif 195# endif
196# undef EV_AVOID_STDIO
197#endif
198
199/* OS X, in its infinite idiocy, actually HARDCODES
200 * a limit of 1024 into their select. Where people have brains,
201 * OS X engineers apparently have a vacuum. Or maybe they were
202 * ordered to have a vacuum, or they do anything for money.
203 * This might help. Or not.
204 */
205#define _DARWIN_UNLIMITED_SELECT 1
206
207/* this block tries to deduce configuration from header-defined symbols and defaults */
208
209/* try to deduce the maximum number of signals on this platform */
210#if defined (EV_NSIG)
211/* use what's provided */
212#elif defined (NSIG)
213# define EV_NSIG (NSIG)
214#elif defined(_NSIG)
215# define EV_NSIG (_NSIG)
216#elif defined (SIGMAX)
217# define EV_NSIG (SIGMAX+1)
218#elif defined (SIG_MAX)
219# define EV_NSIG (SIG_MAX+1)
220#elif defined (_SIG_MAX)
221# define EV_NSIG (_SIG_MAX+1)
222#elif defined (MAXSIG)
223# define EV_NSIG (MAXSIG+1)
224#elif defined (MAX_SIG)
225# define EV_NSIG (MAX_SIG+1)
226#elif defined (SIGARRAYSIZE)
227# define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
228#elif defined (_sys_nsig)
229# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
230#else
231# error "unable to find value for NSIG, please report"
232/* to make it compile regardless, just remove the above line, */
233/* but consider reporting it, too! :) */
234# define EV_NSIG 65
235#endif
236
237#ifndef EV_USE_CLOCK_SYSCALL
238# if __linux && __GLIBC__ >= 2
239# define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
240# else
241# define EV_USE_CLOCK_SYSCALL 0
20#endif 242# endif
243#endif
21 244
22#ifndef HAVE_SELECT 245#ifndef EV_USE_MONOTONIC
23# define HAVE_SELECT 1 246# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
247# define EV_USE_MONOTONIC EV_FEATURE_OS
248# else
249# define EV_USE_MONOTONIC 0
24#endif 250# endif
251#endif
25 252
26#ifndef HAVE_EPOLL 253#ifndef EV_USE_REALTIME
27# define HAVE_EPOLL 0 254# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
255#endif
256
257#ifndef EV_USE_NANOSLEEP
258# if _POSIX_C_SOURCE >= 199309L
259# define EV_USE_NANOSLEEP EV_FEATURE_OS
260# else
261# define EV_USE_NANOSLEEP 0
28#endif 262# endif
263#endif
29 264
30#ifndef HAVE_REALTIME 265#ifndef EV_USE_SELECT
31# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ 266# define EV_USE_SELECT EV_FEATURE_BACKENDS
267#endif
268
269#ifndef EV_USE_POLL
270# ifdef _WIN32
271# define EV_USE_POLL 0
272# else
273# define EV_USE_POLL EV_FEATURE_BACKENDS
32#endif 274# endif
275#endif
276
277#ifndef EV_USE_EPOLL
278# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
279# define EV_USE_EPOLL EV_FEATURE_BACKENDS
280# else
281# define EV_USE_EPOLL 0
282# endif
283#endif
284
285#ifndef EV_USE_KQUEUE
286# define EV_USE_KQUEUE 0
287#endif
288
289#ifndef EV_USE_PORT
290# define EV_USE_PORT 0
291#endif
292
293#ifndef EV_USE_INOTIFY
294# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
295# define EV_USE_INOTIFY EV_FEATURE_OS
296# else
297# define EV_USE_INOTIFY 0
298# endif
299#endif
300
301#ifndef EV_PID_HASHSIZE
302# define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
303#endif
304
305#ifndef EV_INOTIFY_HASHSIZE
306# define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
307#endif
308
309#ifndef EV_USE_EVENTFD
310# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
311# define EV_USE_EVENTFD EV_FEATURE_OS
312# else
313# define EV_USE_EVENTFD 0
314# endif
315#endif
316
317#ifndef EV_USE_SIGNALFD
318# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
319# define EV_USE_SIGNALFD EV_FEATURE_OS
320# else
321# define EV_USE_SIGNALFD 0
322# endif
323#endif
324
325#if 0 /* debugging */
326# define EV_VERIFY 3
327# define EV_USE_4HEAP 1
328# define EV_HEAP_CACHE_AT 1
329#endif
330
331#ifndef EV_VERIFY
332# define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
333#endif
334
335#ifndef EV_USE_4HEAP
336# define EV_USE_4HEAP EV_FEATURE_DATA
337#endif
338
339#ifndef EV_HEAP_CACHE_AT
340# define EV_HEAP_CACHE_AT EV_FEATURE_DATA
341#endif
342
343/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
344/* which makes programs even slower. might work on other unices, too. */
345#if EV_USE_CLOCK_SYSCALL
346# include <syscall.h>
347# ifdef SYS_clock_gettime
348# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
349# undef EV_USE_MONOTONIC
350# define EV_USE_MONOTONIC 1
351# else
352# undef EV_USE_CLOCK_SYSCALL
353# define EV_USE_CLOCK_SYSCALL 0
354# endif
355#endif
356
357/* this block fixes any misconfiguration where we know we run into trouble otherwise */
358
359#ifdef _AIX
360/* AIX has a completely broken poll.h header */
361# undef EV_USE_POLL
362# define EV_USE_POLL 0
363#endif
364
365#ifndef CLOCK_MONOTONIC
366# undef EV_USE_MONOTONIC
367# define EV_USE_MONOTONIC 0
368#endif
369
370#ifndef CLOCK_REALTIME
371# undef EV_USE_REALTIME
372# define EV_USE_REALTIME 0
373#endif
374
375#if !EV_STAT_ENABLE
376# undef EV_USE_INOTIFY
377# define EV_USE_INOTIFY 0
378#endif
379
380#if !EV_USE_NANOSLEEP
381# ifndef _WIN32
382# include <sys/select.h>
383# endif
384#endif
385
386#if EV_USE_INOTIFY
387# include <sys/statfs.h>
388# include <sys/inotify.h>
389/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
390# ifndef IN_DONT_FOLLOW
391# undef EV_USE_INOTIFY
392# define EV_USE_INOTIFY 0
393# endif
394#endif
395
396#if EV_SELECT_IS_WINSOCKET
397# include <winsock.h>
398#endif
399
400#if EV_USE_EVENTFD
401/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
402# include <stdint.h>
403# ifndef EFD_NONBLOCK
404# define EFD_NONBLOCK O_NONBLOCK
405# endif
406# ifndef EFD_CLOEXEC
407# ifdef O_CLOEXEC
408# define EFD_CLOEXEC O_CLOEXEC
409# else
410# define EFD_CLOEXEC 02000000
411# endif
412# endif
413EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
414#endif
415
416#if EV_USE_SIGNALFD
417/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
418# include <stdint.h>
419# ifndef SFD_NONBLOCK
420# define SFD_NONBLOCK O_NONBLOCK
421# endif
422# ifndef SFD_CLOEXEC
423# ifdef O_CLOEXEC
424# define SFD_CLOEXEC O_CLOEXEC
425# else
426# define SFD_CLOEXEC 02000000
427# endif
428# endif
429EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
430
431struct signalfd_siginfo
432{
433 uint32_t ssi_signo;
434 char pad[128 - sizeof (uint32_t)];
435};
436#endif
437
438/**/
439
440#if EV_VERIFY >= 3
441# define EV_FREQUENT_CHECK ev_verify (EV_A)
442#else
443# define EV_FREQUENT_CHECK do { } while (0)
444#endif
445
446/*
447 * This is used to avoid floating point rounding problems.
448 * It is added to ev_rt_now when scheduling periodics
449 * to ensure progress, time-wise, even when rounding
450 * errors are against us.
451 * This value is good at least till the year 4000.
452 * Better solutions welcome.
453 */
454#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
33 455
34#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 456#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
35#define MAX_BLOCKTIME 60. 457#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
36 458
37#include "ev.h" 459#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
460#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
38 461
39struct ev_watcher { 462#if __GNUC__ >= 4
40 EV_WATCHER (ev_watcher); 463# define expect(expr,value) __builtin_expect ((expr),(value))
41}; 464# define noinline __attribute__ ((noinline))
465#else
466# define expect(expr,value) (expr)
467# define noinline
468# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
469# define inline
470# endif
471#endif
42 472
43struct ev_watcher_list { 473#define expect_false(expr) expect ((expr) != 0, 0)
44 EV_WATCHER_LIST (ev_watcher_list); 474#define expect_true(expr) expect ((expr) != 0, 1)
45}; 475#define inline_size static inline
46 476
47struct ev_watcher_time { 477#if EV_FEATURE_CODE
48 EV_WATCHER_TIME (ev_watcher_time); 478# define inline_speed static inline
49}; 479#else
480# define inline_speed static noinline
481#endif
50 482
483#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
484
485#if EV_MINPRI == EV_MAXPRI
486# define ABSPRI(w) (((W)w), 0)
487#else
488# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
489#endif
490
491#define EMPTY /* required for microsofts broken pseudo-c compiler */
492#define EMPTY2(a,b) /* used to suppress some warnings */
493
51typedef struct ev_watcher *W; 494typedef ev_watcher *W;
52typedef struct ev_watcher_list *WL; 495typedef ev_watcher_list *WL;
53typedef struct ev_watcher_time *WT; 496typedef ev_watcher_time *WT;
54 497
55static ev_tstamp now, diff; /* monotonic clock */ 498#define ev_active(w) ((W)(w))->active
56ev_tstamp ev_now; 499#define ev_at(w) ((WT)(w))->at
57int ev_method;
58 500
59static int have_monotonic; /* runtime */ 501#if EV_USE_REALTIME
502/* sig_atomic_t is used to avoid per-thread variables or locking but still */
503/* giving it a reasonably high chance of working on typical architectures */
504static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
505#endif
60 506
61static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 507#if EV_USE_MONOTONIC
62static void (*method_modify)(int fd, int oev, int nev); 508static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
63static void (*method_poll)(ev_tstamp timeout); 509#endif
510
511#ifndef EV_FD_TO_WIN32_HANDLE
512# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
513#endif
514#ifndef EV_WIN32_HANDLE_TO_FD
515# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
516#endif
517#ifndef EV_WIN32_CLOSE_FD
518# define EV_WIN32_CLOSE_FD(fd) close (fd)
519#endif
520
521#ifdef _WIN32
522# include "ev_win32.c"
523#endif
64 524
65/*****************************************************************************/ 525/*****************************************************************************/
66 526
527#ifdef __linux
528# include <sys/utsname.h>
529#endif
530
531static unsigned int noinline
532ev_linux_version (void)
533{
534#ifdef __linux
535 struct utsname buf;
536 unsigned int v;
537 int i;
538 char *p = buf.release;
539
540 if (uname (&buf))
541 return 0;
542
543 for (i = 3+1; --i; )
544 {
545 unsigned int c = 0;
546
547 for (;;)
548 {
549 if (*p >= '0' && *p <= '9')
550 c = c * 10 + *p++ - '0';
551 else
552 {
553 p += *p == '.';
554 break;
555 }
556 }
557
558 v = (v << 8) | c;
559 }
560
561 return v;
562#else
563 return 0;
564#endif
565}
566
567/*****************************************************************************/
568
569#if EV_AVOID_STDIO
570static void noinline
571ev_printerr (const char *msg)
572{
573 write (STDERR_FILENO, msg, strlen (msg));
574}
575#endif
576
577static void (*syserr_cb)(const char *msg);
578
579void
580ev_set_syserr_cb (void (*cb)(const char *msg))
581{
582 syserr_cb = cb;
583}
584
585static void noinline
586ev_syserr (const char *msg)
587{
588 if (!msg)
589 msg = "(libev) system error";
590
591 if (syserr_cb)
592 syserr_cb (msg);
593 else
594 {
595#if EV_AVOID_STDIO
596 const char *err = strerror (errno);
597
598 ev_printerr (msg);
599 ev_printerr (": ");
600 ev_printerr (err);
601 ev_printerr ("\n");
602#else
603 perror (msg);
604#endif
605 abort ();
606 }
607}
608
609static void *
610ev_realloc_emul (void *ptr, long size)
611{
612#if __GLIBC__
613 return realloc (ptr, size);
614#else
615 /* some systems, notably openbsd and darwin, fail to properly
616 * implement realloc (x, 0) (as required by both ansi c-89 and
617 * the single unix specification, so work around them here.
618 */
619
620 if (size)
621 return realloc (ptr, size);
622
623 free (ptr);
624 return 0;
625#endif
626}
627
628static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
629
630void
631ev_set_allocator (void *(*cb)(void *ptr, long size))
632{
633 alloc = cb;
634}
635
636inline_speed void *
637ev_realloc (void *ptr, long size)
638{
639 ptr = alloc (ptr, size);
640
641 if (!ptr && size)
642 {
643#if EV_AVOID_STDIO
644 ev_printerr ("libev: memory allocation failed, aborting.\n");
645#else
646 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
647#endif
648 abort ();
649 }
650
651 return ptr;
652}
653
654#define ev_malloc(size) ev_realloc (0, (size))
655#define ev_free(ptr) ev_realloc ((ptr), 0)
656
657/*****************************************************************************/
658
659/* set in reify when reification needed */
660#define EV_ANFD_REIFY 1
661
662/* file descriptor info structure */
663typedef struct
664{
665 WL head;
666 unsigned char events; /* the events watched for */
667 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
668 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
669 unsigned char unused;
670#if EV_USE_EPOLL
671 unsigned int egen; /* generation counter to counter epoll bugs */
672#endif
673#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
674 SOCKET handle;
675#endif
676#if EV_USE_IOCP
677 OVERLAPPED or, ow;
678#endif
679} ANFD;
680
681/* stores the pending event set for a given watcher */
682typedef struct
683{
684 W w;
685 int events; /* the pending event set for the given watcher */
686} ANPENDING;
687
688#if EV_USE_INOTIFY
689/* hash table entry per inotify-id */
690typedef struct
691{
692 WL head;
693} ANFS;
694#endif
695
696/* Heap Entry */
697#if EV_HEAP_CACHE_AT
698 /* a heap element */
699 typedef struct {
700 ev_tstamp at;
701 WT w;
702 } ANHE;
703
704 #define ANHE_w(he) (he).w /* access watcher, read-write */
705 #define ANHE_at(he) (he).at /* access cached at, read-only */
706 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
707#else
708 /* a heap element */
709 typedef WT ANHE;
710
711 #define ANHE_w(he) (he)
712 #define ANHE_at(he) (he)->at
713 #define ANHE_at_cache(he)
714#endif
715
716#if EV_MULTIPLICITY
717
718 struct ev_loop
719 {
720 ev_tstamp ev_rt_now;
721 #define ev_rt_now ((loop)->ev_rt_now)
722 #define VAR(name,decl) decl;
723 #include "ev_vars.h"
724 #undef VAR
725 };
726 #include "ev_wrap.h"
727
728 static struct ev_loop default_loop_struct;
729 struct ev_loop *ev_default_loop_ptr;
730
731#else
732
733 ev_tstamp ev_rt_now;
734 #define VAR(name,decl) static decl;
735 #include "ev_vars.h"
736 #undef VAR
737
738 static int ev_default_loop_ptr;
739
740#endif
741
742#if EV_FEATURE_API
743# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
744# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
745# define EV_INVOKE_PENDING invoke_cb (EV_A)
746#else
747# define EV_RELEASE_CB (void)0
748# define EV_ACQUIRE_CB (void)0
749# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
750#endif
751
752#define EVBREAK_RECURSE 0x80
753
754/*****************************************************************************/
755
756#ifndef EV_HAVE_EV_TIME
67ev_tstamp 757ev_tstamp
68ev_time (void) 758ev_time (void)
69{ 759{
70#if HAVE_REALTIME 760#if EV_USE_REALTIME
761 if (expect_true (have_realtime))
762 {
71 struct timespec ts; 763 struct timespec ts;
72 clock_gettime (CLOCK_REALTIME, &ts); 764 clock_gettime (CLOCK_REALTIME, &ts);
73 return ts.tv_sec + ts.tv_nsec * 1e-9; 765 return ts.tv_sec + ts.tv_nsec * 1e-9;
74#else 766 }
767#endif
768
75 struct timeval tv; 769 struct timeval tv;
76 gettimeofday (&tv, 0); 770 gettimeofday (&tv, 0);
77 return tv.tv_sec + tv.tv_usec * 1e-6; 771 return tv.tv_sec + tv.tv_usec * 1e-6;
78#endif
79} 772}
773#endif
80 774
81static ev_tstamp 775inline_size ev_tstamp
82get_clock (void) 776get_clock (void)
83{ 777{
84#if HAVE_MONOTONIC 778#if EV_USE_MONOTONIC
85 if (have_monotonic) 779 if (expect_true (have_monotonic))
86 { 780 {
87 struct timespec ts; 781 struct timespec ts;
88 clock_gettime (CLOCK_MONOTONIC, &ts); 782 clock_gettime (CLOCK_MONOTONIC, &ts);
89 return ts.tv_sec + ts.tv_nsec * 1e-9; 783 return ts.tv_sec + ts.tv_nsec * 1e-9;
90 } 784 }
91#endif 785#endif
92 786
93 return ev_time (); 787 return ev_time ();
94} 788}
95 789
96#define array_needsize(base,cur,cnt,init) \ 790#if EV_MULTIPLICITY
97 if ((cnt) > cur) \ 791ev_tstamp
98 { \ 792ev_now (EV_P)
99 int newcnt = cur ? cur << 1 : 16; \ 793{
100 fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ 794 return ev_rt_now;
101 base = realloc (base, sizeof (*base) * (newcnt)); \ 795}
102 init (base + cur, newcnt - cur); \ 796#endif
103 cur = newcnt; \ 797
798void
799ev_sleep (ev_tstamp delay)
800{
801 if (delay > 0.)
104 } 802 {
803#if EV_USE_NANOSLEEP
804 struct timespec ts;
805
806 EV_TS_SET (ts, delay);
807 nanosleep (&ts, 0);
808#elif defined(_WIN32)
809 Sleep ((unsigned long)(delay * 1e3));
810#else
811 struct timeval tv;
812
813 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
814 /* something not guaranteed by newer posix versions, but guaranteed */
815 /* by older ones */
816 EV_TV_SET (tv, delay);
817 select (0, 0, 0, 0, &tv);
818#endif
819 }
820}
105 821
106/*****************************************************************************/ 822/*****************************************************************************/
107 823
108typedef struct 824#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
109{
110 struct ev_io *head;
111 unsigned char wev, rev; /* want, received event set */
112} ANFD;
113 825
114static ANFD *anfds; 826/* find a suitable new size for the given array, */
115static int anfdmax; 827/* hopefully by rounding to a nice-to-malloc size */
116 828inline_size int
117static int *fdchanges; 829array_nextsize (int elem, int cur, int cnt)
118static int fdchangemax, fdchangecnt;
119
120static void
121anfds_init (ANFD *base, int count)
122{ 830{
123 while (count--) 831 int ncur = cur + 1;
124 { 832
125 base->head = 0; 833 do
126 base->wev = base->rev = EV_NONE; 834 ncur <<= 1;
127 ++base; 835 while (cnt > ncur);
836
837 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
838 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
128 } 839 {
129} 840 ncur *= elem;
841 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
842 ncur = ncur - sizeof (void *) * 4;
843 ncur /= elem;
844 }
130 845
131typedef struct 846 return ncur;
132{ 847}
133 W w;
134 int events;
135} ANPENDING;
136 848
137static ANPENDING *pendings; 849static noinline void *
138static int pendingmax, pendingcnt; 850array_realloc (int elem, void *base, int *cur, int cnt)
139
140static void
141event (W w, int events)
142{ 851{
143 w->pending = ++pendingcnt; 852 *cur = array_nextsize (elem, *cur, cnt);
144 array_needsize (pendings, pendingmax, pendingcnt, ); 853 return ev_realloc (base, elem * *cur);
145 pendings [pendingcnt - 1].w = w; 854}
855
856#define array_init_zero(base,count) \
857 memset ((void *)(base), 0, sizeof (*(base)) * (count))
858
859#define array_needsize(type,base,cur,cnt,init) \
860 if (expect_false ((cnt) > (cur))) \
861 { \
862 int ocur_ = (cur); \
863 (base) = (type *)array_realloc \
864 (sizeof (type), (base), &(cur), (cnt)); \
865 init ((base) + (ocur_), (cur) - ocur_); \
866 }
867
868#if 0
869#define array_slim(type,stem) \
870 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
871 { \
872 stem ## max = array_roundsize (stem ## cnt >> 1); \
873 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
874 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
875 }
876#endif
877
878#define array_free(stem, idx) \
879 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
880
881/*****************************************************************************/
882
883/* dummy callback for pending events */
884static void noinline
885pendingcb (EV_P_ ev_prepare *w, int revents)
886{
887}
888
889void noinline
890ev_feed_event (EV_P_ void *w, int revents)
891{
892 W w_ = (W)w;
893 int pri = ABSPRI (w_);
894
895 if (expect_false (w_->pending))
146 pendings [pendingcnt - 1].events = events; 896 pendings [pri][w_->pending - 1].events |= revents;
897 else
898 {
899 w_->pending = ++pendingcnt [pri];
900 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
901 pendings [pri][w_->pending - 1].w = w_;
902 pendings [pri][w_->pending - 1].events = revents;
903 }
147} 904}
148 905
149static void 906inline_speed void
907feed_reverse (EV_P_ W w)
908{
909 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
910 rfeeds [rfeedcnt++] = w;
911}
912
913inline_size void
914feed_reverse_done (EV_P_ int revents)
915{
916 do
917 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
918 while (rfeedcnt);
919}
920
921inline_speed void
922queue_events (EV_P_ W *events, int eventcnt, int type)
923{
924 int i;
925
926 for (i = 0; i < eventcnt; ++i)
927 ev_feed_event (EV_A_ events [i], type);
928}
929
930/*****************************************************************************/
931
932inline_speed void
150fd_event (int fd, int events) 933fd_event_nocheck (EV_P_ int fd, int revents)
151{ 934{
152 ANFD *anfd = anfds + fd; 935 ANFD *anfd = anfds + fd;
153 struct ev_io *w; 936 ev_io *w;
154 937
155 for (w = anfd->head; w; w = w->next) 938 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
156 { 939 {
157 int ev = w->events & events; 940 int ev = w->events & revents;
158 941
159 if (ev) 942 if (ev)
160 event ((W)w, ev); 943 ev_feed_event (EV_A_ (W)w, ev);
161 }
162}
163
164static void
165queue_events (W *events, int eventcnt, int type)
166{
167 int i;
168
169 for (i = 0; i < eventcnt; ++i)
170 event (events [i], type);
171}
172
173/*****************************************************************************/
174
175static struct ev_timer **timers;
176static int timermax, timercnt;
177
178static struct ev_periodic **periodics;
179static int periodicmax, periodiccnt;
180
181static void
182upheap (WT *timers, int k)
183{
184 WT w = timers [k];
185
186 while (k && timers [k >> 1]->at > w->at)
187 {
188 timers [k] = timers [k >> 1];
189 timers [k]->active = k + 1;
190 k >>= 1;
191 }
192
193 timers [k] = w;
194 timers [k]->active = k + 1;
195
196}
197
198static void
199downheap (WT *timers, int N, int k)
200{
201 WT w = timers [k];
202
203 while (k < (N >> 1))
204 {
205 int j = k << 1;
206
207 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
208 ++j;
209
210 if (w->at <= timers [j]->at)
211 break;
212
213 timers [k] = timers [j];
214 timers [k]->active = k + 1;
215 k = j;
216 }
217
218 timers [k] = w;
219 timers [k]->active = k + 1;
220}
221
222/*****************************************************************************/
223
224typedef struct
225{
226 struct ev_signal *head;
227 sig_atomic_t gotsig;
228} ANSIG;
229
230static ANSIG *signals;
231static int signalmax;
232
233static int sigpipe [2];
234static sig_atomic_t gotsig;
235static struct ev_io sigev;
236
237static void
238signals_init (ANSIG *base, int count)
239{
240 while (count--)
241 {
242 base->head = 0;
243 base->gotsig = 0;
244 ++base;
245 }
246}
247
248static void
249sighandler (int signum)
250{
251 signals [signum - 1].gotsig = 1;
252
253 if (!gotsig)
254 {
255 gotsig = 1;
256 write (sigpipe [1], &gotsig, 1);
257 }
258}
259
260static void
261sigcb (struct ev_io *iow, int revents)
262{
263 struct ev_signal *w;
264 int sig;
265
266 gotsig = 0;
267 read (sigpipe [0], &revents, 1);
268
269 for (sig = signalmax; sig--; )
270 if (signals [sig].gotsig)
271 {
272 signals [sig].gotsig = 0;
273
274 for (w = signals [sig].head; w; w = w->next)
275 event ((W)w, EV_SIGNAL);
276 } 944 }
277} 945}
278 946
279static void 947/* do not submit kernel events for fds that have reify set */
280siginit (void) 948/* because that means they changed while we were polling for new events */
949inline_speed void
950fd_event (EV_P_ int fd, int revents)
281{ 951{
282 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); 952 ANFD *anfd = anfds + fd;
283 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
284 953
285 /* rather than sort out wether we really need nb, set it */ 954 if (expect_true (!anfd->reify))
286 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 955 fd_event_nocheck (EV_A_ fd, revents);
287 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
288
289 evio_set (&sigev, sigpipe [0], EV_READ);
290 evio_start (&sigev);
291} 956}
292 957
293/*****************************************************************************/ 958void
294 959ev_feed_fd_event (EV_P_ int fd, int revents)
295static struct ev_idle **idles;
296static int idlemax, idlecnt;
297
298static struct ev_check **checks;
299static int checkmax, checkcnt;
300
301/*****************************************************************************/
302
303#if HAVE_EPOLL
304# include "ev_epoll.c"
305#endif
306#if HAVE_SELECT
307# include "ev_select.c"
308#endif
309
310int ev_init (int flags)
311{ 960{
312#if HAVE_MONOTONIC 961 if (fd >= 0 && fd < anfdmax)
313 { 962 fd_event_nocheck (EV_A_ fd, revents);
314 struct timespec ts;
315 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
316 have_monotonic = 1;
317 }
318#endif
319
320 ev_now = ev_time ();
321 now = get_clock ();
322 diff = ev_now - now;
323
324 if (pipe (sigpipe))
325 return 0;
326
327 ev_method = EVMETHOD_NONE;
328#if HAVE_EPOLL
329 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
330#endif
331#if HAVE_SELECT
332 if (ev_method == EVMETHOD_NONE) select_init (flags);
333#endif
334
335 if (ev_method)
336 {
337 evw_init (&sigev, sigcb);
338 siginit ();
339 }
340
341 return ev_method;
342} 963}
343 964
344/*****************************************************************************/ 965/* make sure the external fd watch events are in-sync */
345 966/* with the kernel/libev internal state */
346void ev_prefork (void) 967inline_size void
347{ 968fd_reify (EV_P)
348 /* nop */
349}
350
351void ev_postfork_parent (void)
352{
353 /* nop */
354}
355
356void ev_postfork_child (void)
357{
358#if HAVE_EPOLL
359 if (ev_method == EVMETHOD_EPOLL)
360 epoll_postfork_child ();
361#endif
362
363 evio_stop (&sigev);
364 close (sigpipe [0]);
365 close (sigpipe [1]);
366 pipe (sigpipe);
367 siginit ();
368}
369
370/*****************************************************************************/
371
372static void
373fd_reify (void)
374{ 969{
375 int i; 970 int i;
376 971
377 for (i = 0; i < fdchangecnt; ++i) 972 for (i = 0; i < fdchangecnt; ++i)
378 { 973 {
379 int fd = fdchanges [i]; 974 int fd = fdchanges [i];
380 ANFD *anfd = anfds + fd; 975 ANFD *anfd = anfds + fd;
381 struct ev_io *w; 976 ev_io *w;
382 977
383 int wev = 0; 978 unsigned char o_events = anfd->events;
979 unsigned char o_reify = anfd->reify;
384 980
385 for (w = anfd->head; w; w = w->next) 981 anfd->reify = 0;
386 wev |= w->events;
387 982
388 if (anfd->wev != wev) 983#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
984 if (o_reify & EV__IOFDSET)
389 { 985 {
390 method_modify (fd, anfd->wev, wev); 986 unsigned long arg;
391 anfd->wev = wev; 987 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
988 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
989 printf ("oi %d %x\n", fd, anfd->handle);//D
392 } 990 }
991#endif
992
993 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
994 {
995 anfd->events = 0;
996
997 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
998 anfd->events |= (unsigned char)w->events;
999
1000 if (o_events != anfd->events)
1001 o_reify = EV__IOFDSET; /* actually |= */
1002 }
1003
1004 if (o_reify & EV__IOFDSET)
1005 backend_modify (EV_A_ fd, o_events, anfd->events);
393 } 1006 }
394 1007
395 fdchangecnt = 0; 1008 fdchangecnt = 0;
396} 1009}
397 1010
1011/* something about the given fd changed */
1012inline_size void
1013fd_change (EV_P_ int fd, int flags)
1014{
1015 unsigned char reify = anfds [fd].reify;
1016 anfds [fd].reify |= flags;
1017
1018 if (expect_true (!reify))
1019 {
1020 ++fdchangecnt;
1021 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1022 fdchanges [fdchangecnt - 1] = fd;
1023 }
1024}
1025
1026/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1027inline_speed void
1028fd_kill (EV_P_ int fd)
1029{
1030 ev_io *w;
1031
1032 while ((w = (ev_io *)anfds [fd].head))
1033 {
1034 ev_io_stop (EV_A_ w);
1035 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1036 }
1037}
1038
1039/* check whether the given fd is actually valid, for error recovery */
1040inline_size int
1041fd_valid (int fd)
1042{
1043#ifdef _WIN32
1044 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1045#else
1046 return fcntl (fd, F_GETFD) != -1;
1047#endif
1048}
1049
1050/* called on EBADF to verify fds */
1051static void noinline
1052fd_ebadf (EV_P)
1053{
1054 int fd;
1055
1056 for (fd = 0; fd < anfdmax; ++fd)
1057 if (anfds [fd].events)
1058 if (!fd_valid (fd) && errno == EBADF)
1059 fd_kill (EV_A_ fd);
1060}
1061
1062/* called on ENOMEM in select/poll to kill some fds and retry */
1063static void noinline
1064fd_enomem (EV_P)
1065{
1066 int fd;
1067
1068 for (fd = anfdmax; fd--; )
1069 if (anfds [fd].events)
1070 {
1071 fd_kill (EV_A_ fd);
1072 break;
1073 }
1074}
1075
1076/* usually called after fork if backend needs to re-arm all fds from scratch */
1077static void noinline
1078fd_rearm_all (EV_P)
1079{
1080 int fd;
1081
1082 for (fd = 0; fd < anfdmax; ++fd)
1083 if (anfds [fd].events)
1084 {
1085 anfds [fd].events = 0;
1086 anfds [fd].emask = 0;
1087 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1088 }
1089}
1090
1091/* used to prepare libev internal fd's */
1092/* this is not fork-safe */
1093inline_speed void
1094fd_intern (int fd)
1095{
1096#ifdef _WIN32
1097 unsigned long arg = 1;
1098 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1099#else
1100 fcntl (fd, F_SETFD, FD_CLOEXEC);
1101 fcntl (fd, F_SETFL, O_NONBLOCK);
1102#endif
1103}
1104
1105/*****************************************************************************/
1106
1107/*
1108 * the heap functions want a real array index. array index 0 is guaranteed to not
1109 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1110 * the branching factor of the d-tree.
1111 */
1112
1113/*
1114 * at the moment we allow libev the luxury of two heaps,
1115 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1116 * which is more cache-efficient.
1117 * the difference is about 5% with 50000+ watchers.
1118 */
1119#if EV_USE_4HEAP
1120
1121#define DHEAP 4
1122#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1123#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1124#define UPHEAP_DONE(p,k) ((p) == (k))
1125
1126/* away from the root */
1127inline_speed void
1128downheap (ANHE *heap, int N, int k)
1129{
1130 ANHE he = heap [k];
1131 ANHE *E = heap + N + HEAP0;
1132
1133 for (;;)
1134 {
1135 ev_tstamp minat;
1136 ANHE *minpos;
1137 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1138
1139 /* find minimum child */
1140 if (expect_true (pos + DHEAP - 1 < E))
1141 {
1142 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1143 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1144 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1145 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1146 }
1147 else if (pos < E)
1148 {
1149 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1150 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1151 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1152 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1153 }
1154 else
1155 break;
1156
1157 if (ANHE_at (he) <= minat)
1158 break;
1159
1160 heap [k] = *minpos;
1161 ev_active (ANHE_w (*minpos)) = k;
1162
1163 k = minpos - heap;
1164 }
1165
1166 heap [k] = he;
1167 ev_active (ANHE_w (he)) = k;
1168}
1169
1170#else /* 4HEAP */
1171
1172#define HEAP0 1
1173#define HPARENT(k) ((k) >> 1)
1174#define UPHEAP_DONE(p,k) (!(p))
1175
1176/* away from the root */
1177inline_speed void
1178downheap (ANHE *heap, int N, int k)
1179{
1180 ANHE he = heap [k];
1181
1182 for (;;)
1183 {
1184 int c = k << 1;
1185
1186 if (c >= N + HEAP0)
1187 break;
1188
1189 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1190 ? 1 : 0;
1191
1192 if (ANHE_at (he) <= ANHE_at (heap [c]))
1193 break;
1194
1195 heap [k] = heap [c];
1196 ev_active (ANHE_w (heap [k])) = k;
1197
1198 k = c;
1199 }
1200
1201 heap [k] = he;
1202 ev_active (ANHE_w (he)) = k;
1203}
1204#endif
1205
1206/* towards the root */
1207inline_speed void
1208upheap (ANHE *heap, int k)
1209{
1210 ANHE he = heap [k];
1211
1212 for (;;)
1213 {
1214 int p = HPARENT (k);
1215
1216 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1217 break;
1218
1219 heap [k] = heap [p];
1220 ev_active (ANHE_w (heap [k])) = k;
1221 k = p;
1222 }
1223
1224 heap [k] = he;
1225 ev_active (ANHE_w (he)) = k;
1226}
1227
1228/* move an element suitably so it is in a correct place */
1229inline_size void
1230adjustheap (ANHE *heap, int N, int k)
1231{
1232 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1233 upheap (heap, k);
1234 else
1235 downheap (heap, N, k);
1236}
1237
1238/* rebuild the heap: this function is used only once and executed rarely */
1239inline_size void
1240reheap (ANHE *heap, int N)
1241{
1242 int i;
1243
1244 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1245 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1246 for (i = 0; i < N; ++i)
1247 upheap (heap, i + HEAP0);
1248}
1249
1250/*****************************************************************************/
1251
1252/* associate signal watchers to a signal signal */
1253typedef struct
1254{
1255 EV_ATOMIC_T pending;
1256#if EV_MULTIPLICITY
1257 EV_P;
1258#endif
1259 WL head;
1260} ANSIG;
1261
1262static ANSIG signals [EV_NSIG - 1];
1263
1264/*****************************************************************************/
1265
1266#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1267
1268static void noinline
1269evpipe_init (EV_P)
1270{
1271 if (!ev_is_active (&pipe_w))
1272 {
1273# if EV_USE_EVENTFD
1274 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1275 if (evfd < 0 && errno == EINVAL)
1276 evfd = eventfd (0, 0);
1277
1278 if (evfd >= 0)
1279 {
1280 evpipe [0] = -1;
1281 fd_intern (evfd); /* doing it twice doesn't hurt */
1282 ev_io_set (&pipe_w, evfd, EV_READ);
1283 }
1284 else
1285# endif
1286 {
1287 while (pipe (evpipe))
1288 ev_syserr ("(libev) error creating signal/async pipe");
1289
1290 fd_intern (evpipe [0]);
1291 fd_intern (evpipe [1]);
1292 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1293 }
1294
1295 ev_io_start (EV_A_ &pipe_w);
1296 ev_unref (EV_A); /* watcher should not keep loop alive */
1297 }
1298}
1299
1300inline_size void
1301evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1302{
1303 if (!*flag)
1304 {
1305 int old_errno = errno; /* save errno because write might clobber it */
1306 char dummy;
1307
1308 *flag = 1;
1309
1310#if EV_USE_EVENTFD
1311 if (evfd >= 0)
1312 {
1313 uint64_t counter = 1;
1314 write (evfd, &counter, sizeof (uint64_t));
1315 }
1316 else
1317#endif
1318 /* win32 people keep sending patches that change this write() to send() */
1319 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1320 /* so when you think this write should be a send instead, please find out */
1321 /* where your send() is from - it's definitely not the microsoft send, and */
1322 /* tell me. thank you. */
1323 write (evpipe [1], &dummy, 1);
1324
1325 errno = old_errno;
1326 }
1327}
1328
1329/* called whenever the libev signal pipe */
1330/* got some events (signal, async) */
398static void 1331static void
399call_pending () 1332pipecb (EV_P_ ev_io *iow, int revents)
400{ 1333{
401 int i; 1334 int i;
402 1335
403 for (i = 0; i < pendingcnt; ++i) 1336#if EV_USE_EVENTFD
1337 if (evfd >= 0)
1338 {
1339 uint64_t counter;
1340 read (evfd, &counter, sizeof (uint64_t));
404 { 1341 }
405 ANPENDING *p = pendings + i; 1342 else
1343#endif
1344 {
1345 char dummy;
1346 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1347 read (evpipe [0], &dummy, 1);
1348 }
406 1349
407 if (p->w) 1350 if (sig_pending)
1351 {
1352 sig_pending = 0;
1353
1354 for (i = EV_NSIG - 1; i--; )
1355 if (expect_false (signals [i].pending))
1356 ev_feed_signal_event (EV_A_ i + 1);
1357 }
1358
1359#if EV_ASYNC_ENABLE
1360 if (async_pending)
1361 {
1362 async_pending = 0;
1363
1364 for (i = asynccnt; i--; )
1365 if (asyncs [i]->sent)
1366 {
1367 asyncs [i]->sent = 0;
1368 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1369 }
1370 }
1371#endif
1372}
1373
1374/*****************************************************************************/
1375
1376static void
1377ev_sighandler (int signum)
1378{
1379#if EV_MULTIPLICITY
1380 EV_P = signals [signum - 1].loop;
1381#endif
1382
1383#ifdef _WIN32
1384 signal (signum, ev_sighandler);
1385#endif
1386
1387 signals [signum - 1].pending = 1;
1388 evpipe_write (EV_A_ &sig_pending);
1389}
1390
1391void noinline
1392ev_feed_signal_event (EV_P_ int signum)
1393{
1394 WL w;
1395
1396 if (expect_false (signum <= 0 || signum > EV_NSIG))
1397 return;
1398
1399 --signum;
1400
1401#if EV_MULTIPLICITY
1402 /* it is permissible to try to feed a signal to the wrong loop */
1403 /* or, likely more useful, feeding a signal nobody is waiting for */
1404
1405 if (expect_false (signals [signum].loop != EV_A))
1406 return;
1407#endif
1408
1409 signals [signum].pending = 0;
1410
1411 for (w = signals [signum].head; w; w = w->next)
1412 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1413}
1414
1415#if EV_USE_SIGNALFD
1416static void
1417sigfdcb (EV_P_ ev_io *iow, int revents)
1418{
1419 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1420
1421 for (;;)
1422 {
1423 ssize_t res = read (sigfd, si, sizeof (si));
1424
1425 /* not ISO-C, as res might be -1, but works with SuS */
1426 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1427 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1428
1429 if (res < (ssize_t)sizeof (si))
1430 break;
1431 }
1432}
1433#endif
1434
1435#endif
1436
1437/*****************************************************************************/
1438
1439#if EV_CHILD_ENABLE
1440static WL childs [EV_PID_HASHSIZE];
1441
1442static ev_signal childev;
1443
1444#ifndef WIFCONTINUED
1445# define WIFCONTINUED(status) 0
1446#endif
1447
1448/* handle a single child status event */
1449inline_speed void
1450child_reap (EV_P_ int chain, int pid, int status)
1451{
1452 ev_child *w;
1453 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1454
1455 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1456 {
1457 if ((w->pid == pid || !w->pid)
1458 && (!traced || (w->flags & 1)))
408 { 1459 {
409 p->w->pending = 0; 1460 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
410 p->w->cb (p->w, p->events); 1461 w->rpid = pid;
1462 w->rstatus = status;
1463 ev_feed_event (EV_A_ (W)w, EV_CHILD);
411 } 1464 }
412 } 1465 }
413
414 pendingcnt = 0;
415} 1466}
416 1467
1468#ifndef WCONTINUED
1469# define WCONTINUED 0
1470#endif
1471
1472/* called on sigchld etc., calls waitpid */
417static void 1473static void
1474childcb (EV_P_ ev_signal *sw, int revents)
1475{
1476 int pid, status;
1477
1478 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1479 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1480 if (!WCONTINUED
1481 || errno != EINVAL
1482 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1483 return;
1484
1485 /* make sure we are called again until all children have been reaped */
1486 /* we need to do it this way so that the callback gets called before we continue */
1487 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1488
1489 child_reap (EV_A_ pid, pid, status);
1490 if ((EV_PID_HASHSIZE) > 1)
1491 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1492}
1493
1494#endif
1495
1496/*****************************************************************************/
1497
1498#if EV_USE_IOCP
1499# include "ev_iocp.c"
1500#endif
1501#if EV_USE_PORT
1502# include "ev_port.c"
1503#endif
1504#if EV_USE_KQUEUE
1505# include "ev_kqueue.c"
1506#endif
1507#if EV_USE_EPOLL
1508# include "ev_epoll.c"
1509#endif
1510#if EV_USE_POLL
1511# include "ev_poll.c"
1512#endif
1513#if EV_USE_SELECT
1514# include "ev_select.c"
1515#endif
1516
1517int
1518ev_version_major (void)
1519{
1520 return EV_VERSION_MAJOR;
1521}
1522
1523int
1524ev_version_minor (void)
1525{
1526 return EV_VERSION_MINOR;
1527}
1528
1529/* return true if we are running with elevated privileges and should ignore env variables */
1530int inline_size
1531enable_secure (void)
1532{
1533#ifdef _WIN32
1534 return 0;
1535#else
1536 return getuid () != geteuid ()
1537 || getgid () != getegid ();
1538#endif
1539}
1540
1541unsigned int
1542ev_supported_backends (void)
1543{
1544 unsigned int flags = 0;
1545
1546 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1547 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1548 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1549 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1550 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1551
1552 return flags;
1553}
1554
1555unsigned int
1556ev_recommended_backends (void)
1557{
1558 unsigned int flags = ev_supported_backends ();
1559
1560#ifndef __NetBSD__
1561 /* kqueue is borked on everything but netbsd apparently */
1562 /* it usually doesn't work correctly on anything but sockets and pipes */
1563 flags &= ~EVBACKEND_KQUEUE;
1564#endif
1565#ifdef __APPLE__
1566 /* only select works correctly on that "unix-certified" platform */
1567 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1568 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1569#endif
1570#ifdef __FreeBSD__
1571 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1572#endif
1573
1574 return flags;
1575}
1576
1577unsigned int
1578ev_embeddable_backends (void)
1579{
1580 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1581
1582 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1583 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1584 flags &= ~EVBACKEND_EPOLL;
1585
1586 return flags;
1587}
1588
1589unsigned int
1590ev_backend (EV_P)
1591{
1592 return backend;
1593}
1594
1595#if EV_FEATURE_API
1596unsigned int
1597ev_iteration (EV_P)
1598{
1599 return loop_count;
1600}
1601
1602unsigned int
1603ev_depth (EV_P)
1604{
1605 return loop_depth;
1606}
1607
1608void
1609ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1610{
1611 io_blocktime = interval;
1612}
1613
1614void
1615ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1616{
1617 timeout_blocktime = interval;
1618}
1619
1620void
1621ev_set_userdata (EV_P_ void *data)
1622{
1623 userdata = data;
1624}
1625
1626void *
1627ev_userdata (EV_P)
1628{
1629 return userdata;
1630}
1631
1632void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1633{
1634 invoke_cb = invoke_pending_cb;
1635}
1636
1637void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1638{
1639 release_cb = release;
1640 acquire_cb = acquire;
1641}
1642#endif
1643
1644/* initialise a loop structure, must be zero-initialised */
1645static void noinline
1646loop_init (EV_P_ unsigned int flags)
1647{
1648 if (!backend)
1649 {
1650#if EV_USE_REALTIME
1651 if (!have_realtime)
1652 {
1653 struct timespec ts;
1654
1655 if (!clock_gettime (CLOCK_REALTIME, &ts))
1656 have_realtime = 1;
1657 }
1658#endif
1659
1660#if EV_USE_MONOTONIC
1661 if (!have_monotonic)
1662 {
1663 struct timespec ts;
1664
1665 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1666 have_monotonic = 1;
1667 }
1668#endif
1669
1670 /* pid check not overridable via env */
1671#ifndef _WIN32
1672 if (flags & EVFLAG_FORKCHECK)
1673 curpid = getpid ();
1674#endif
1675
1676 if (!(flags & EVFLAG_NOENV)
1677 && !enable_secure ()
1678 && getenv ("LIBEV_FLAGS"))
1679 flags = atoi (getenv ("LIBEV_FLAGS"));
1680
1681 ev_rt_now = ev_time ();
1682 mn_now = get_clock ();
1683 now_floor = mn_now;
1684 rtmn_diff = ev_rt_now - mn_now;
1685#if EV_FEATURE_API
1686 invoke_cb = ev_invoke_pending;
1687#endif
1688
1689 io_blocktime = 0.;
1690 timeout_blocktime = 0.;
1691 backend = 0;
1692 backend_fd = -1;
1693 sig_pending = 0;
1694#if EV_ASYNC_ENABLE
1695 async_pending = 0;
1696#endif
1697#if EV_USE_INOTIFY
1698 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1699#endif
1700#if EV_USE_SIGNALFD
1701 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1702#endif
1703
1704 if (!(flags & 0x0000ffffU))
1705 flags |= ev_recommended_backends ();
1706
1707#if EV_USE_IOCP
1708 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1709#endif
1710#if EV_USE_PORT
1711 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1712#endif
1713#if EV_USE_KQUEUE
1714 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1715#endif
1716#if EV_USE_EPOLL
1717 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1718#endif
1719#if EV_USE_POLL
1720 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1721#endif
1722#if EV_USE_SELECT
1723 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1724#endif
1725
1726 ev_prepare_init (&pending_w, pendingcb);
1727
1728#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1729 ev_init (&pipe_w, pipecb);
1730 ev_set_priority (&pipe_w, EV_MAXPRI);
1731#endif
1732 }
1733}
1734
1735/* free up a loop structure */
1736static void noinline
1737loop_destroy (EV_P)
1738{
1739 int i;
1740
1741 if (ev_is_active (&pipe_w))
1742 {
1743 /*ev_ref (EV_A);*/
1744 /*ev_io_stop (EV_A_ &pipe_w);*/
1745
1746#if EV_USE_EVENTFD
1747 if (evfd >= 0)
1748 close (evfd);
1749#endif
1750
1751 if (evpipe [0] >= 0)
1752 {
1753 EV_WIN32_CLOSE_FD (evpipe [0]);
1754 EV_WIN32_CLOSE_FD (evpipe [1]);
1755 }
1756 }
1757
1758#if EV_USE_SIGNALFD
1759 if (ev_is_active (&sigfd_w))
1760 close (sigfd);
1761#endif
1762
1763#if EV_USE_INOTIFY
1764 if (fs_fd >= 0)
1765 close (fs_fd);
1766#endif
1767
1768 if (backend_fd >= 0)
1769 close (backend_fd);
1770
1771#if EV_USE_IOCP
1772 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1773#endif
1774#if EV_USE_PORT
1775 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1776#endif
1777#if EV_USE_KQUEUE
1778 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1779#endif
1780#if EV_USE_EPOLL
1781 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1782#endif
1783#if EV_USE_POLL
1784 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1785#endif
1786#if EV_USE_SELECT
1787 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1788#endif
1789
1790 for (i = NUMPRI; i--; )
1791 {
1792 array_free (pending, [i]);
1793#if EV_IDLE_ENABLE
1794 array_free (idle, [i]);
1795#endif
1796 }
1797
1798 ev_free (anfds); anfds = 0; anfdmax = 0;
1799
1800 /* have to use the microsoft-never-gets-it-right macro */
1801 array_free (rfeed, EMPTY);
1802 array_free (fdchange, EMPTY);
1803 array_free (timer, EMPTY);
1804#if EV_PERIODIC_ENABLE
1805 array_free (periodic, EMPTY);
1806#endif
1807#if EV_FORK_ENABLE
1808 array_free (fork, EMPTY);
1809#endif
1810 array_free (prepare, EMPTY);
1811 array_free (check, EMPTY);
1812#if EV_ASYNC_ENABLE
1813 array_free (async, EMPTY);
1814#endif
1815
1816 backend = 0;
1817}
1818
1819#if EV_USE_INOTIFY
1820inline_size void infy_fork (EV_P);
1821#endif
1822
1823inline_size void
1824loop_fork (EV_P)
1825{
1826#if EV_USE_PORT
1827 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1828#endif
1829#if EV_USE_KQUEUE
1830 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1831#endif
1832#if EV_USE_EPOLL
1833 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1834#endif
1835#if EV_USE_INOTIFY
1836 infy_fork (EV_A);
1837#endif
1838
1839 if (ev_is_active (&pipe_w))
1840 {
1841 /* this "locks" the handlers against writing to the pipe */
1842 /* while we modify the fd vars */
1843 sig_pending = 1;
1844#if EV_ASYNC_ENABLE
1845 async_pending = 1;
1846#endif
1847
1848 ev_ref (EV_A);
1849 ev_io_stop (EV_A_ &pipe_w);
1850
1851#if EV_USE_EVENTFD
1852 if (evfd >= 0)
1853 close (evfd);
1854#endif
1855
1856 if (evpipe [0] >= 0)
1857 {
1858 EV_WIN32_CLOSE_FD (evpipe [0]);
1859 EV_WIN32_CLOSE_FD (evpipe [1]);
1860 }
1861
1862#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1863 evpipe_init (EV_A);
1864 /* now iterate over everything, in case we missed something */
1865 pipecb (EV_A_ &pipe_w, EV_READ);
1866#endif
1867 }
1868
1869 postfork = 0;
1870}
1871
1872#if EV_MULTIPLICITY
1873
1874struct ev_loop *
1875ev_loop_new (unsigned int flags)
1876{
1877 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1878
1879 memset (EV_A, 0, sizeof (struct ev_loop));
1880 loop_init (EV_A_ flags);
1881
1882 if (ev_backend (EV_A))
1883 return EV_A;
1884
1885 return 0;
1886}
1887
1888void
1889ev_loop_destroy (EV_P)
1890{
1891 loop_destroy (EV_A);
1892 ev_free (loop);
1893}
1894
1895void
1896ev_loop_fork (EV_P)
1897{
1898 postfork = 1; /* must be in line with ev_default_fork */
1899}
1900#endif /* multiplicity */
1901
1902#if EV_VERIFY
1903static void noinline
1904verify_watcher (EV_P_ W w)
1905{
1906 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1907
1908 if (w->pending)
1909 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1910}
1911
1912static void noinline
1913verify_heap (EV_P_ ANHE *heap, int N)
1914{
1915 int i;
1916
1917 for (i = HEAP0; i < N + HEAP0; ++i)
1918 {
1919 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1920 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1921 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1922
1923 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1924 }
1925}
1926
1927static void noinline
1928array_verify (EV_P_ W *ws, int cnt)
1929{
1930 while (cnt--)
1931 {
1932 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1933 verify_watcher (EV_A_ ws [cnt]);
1934 }
1935}
1936#endif
1937
1938#if EV_FEATURE_API
1939void
1940ev_verify (EV_P)
1941{
1942#if EV_VERIFY
1943 int i;
1944 WL w;
1945
1946 assert (activecnt >= -1);
1947
1948 assert (fdchangemax >= fdchangecnt);
1949 for (i = 0; i < fdchangecnt; ++i)
1950 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1951
1952 assert (anfdmax >= 0);
1953 for (i = 0; i < anfdmax; ++i)
1954 for (w = anfds [i].head; w; w = w->next)
1955 {
1956 verify_watcher (EV_A_ (W)w);
1957 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
1958 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1959 }
1960
1961 assert (timermax >= timercnt);
1962 verify_heap (EV_A_ timers, timercnt);
1963
1964#if EV_PERIODIC_ENABLE
1965 assert (periodicmax >= periodiccnt);
1966 verify_heap (EV_A_ periodics, periodiccnt);
1967#endif
1968
1969 for (i = NUMPRI; i--; )
1970 {
1971 assert (pendingmax [i] >= pendingcnt [i]);
1972#if EV_IDLE_ENABLE
1973 assert (idleall >= 0);
1974 assert (idlemax [i] >= idlecnt [i]);
1975 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1976#endif
1977 }
1978
1979#if EV_FORK_ENABLE
1980 assert (forkmax >= forkcnt);
1981 array_verify (EV_A_ (W *)forks, forkcnt);
1982#endif
1983
1984#if EV_ASYNC_ENABLE
1985 assert (asyncmax >= asynccnt);
1986 array_verify (EV_A_ (W *)asyncs, asynccnt);
1987#endif
1988
1989#if EV_PREPARE_ENABLE
1990 assert (preparemax >= preparecnt);
1991 array_verify (EV_A_ (W *)prepares, preparecnt);
1992#endif
1993
1994#if EV_CHECK_ENABLE
1995 assert (checkmax >= checkcnt);
1996 array_verify (EV_A_ (W *)checks, checkcnt);
1997#endif
1998
1999# if 0
2000#if EV_CHILD_ENABLE
2001 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2002 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2003#endif
2004# endif
2005#endif
2006}
2007#endif
2008
2009#if EV_MULTIPLICITY
2010struct ev_loop *
2011#else
2012int
2013#endif
2014ev_default_loop (unsigned int flags)
2015{
2016 if (!ev_default_loop_ptr)
2017 {
2018#if EV_MULTIPLICITY
2019 EV_P = ev_default_loop_ptr = &default_loop_struct;
2020#else
2021 ev_default_loop_ptr = 1;
2022#endif
2023
2024 loop_init (EV_A_ flags);
2025
2026 if (ev_backend (EV_A))
2027 {
2028#if EV_CHILD_ENABLE
2029 ev_signal_init (&childev, childcb, SIGCHLD);
2030 ev_set_priority (&childev, EV_MAXPRI);
2031 ev_signal_start (EV_A_ &childev);
2032 ev_unref (EV_A); /* child watcher should not keep loop alive */
2033#endif
2034 }
2035 else
2036 ev_default_loop_ptr = 0;
2037 }
2038
2039 return ev_default_loop_ptr;
2040}
2041
2042void
2043ev_default_destroy (void)
2044{
2045#if EV_MULTIPLICITY
2046 EV_P = ev_default_loop_ptr;
2047#endif
2048
2049 ev_default_loop_ptr = 0;
2050
2051#if EV_CHILD_ENABLE
2052 ev_ref (EV_A); /* child watcher */
2053 ev_signal_stop (EV_A_ &childev);
2054#endif
2055
2056 loop_destroy (EV_A);
2057}
2058
2059void
2060ev_default_fork (void)
2061{
2062#if EV_MULTIPLICITY
2063 EV_P = ev_default_loop_ptr;
2064#endif
2065
2066 postfork = 1; /* must be in line with ev_loop_fork */
2067}
2068
2069/*****************************************************************************/
2070
2071void
2072ev_invoke (EV_P_ void *w, int revents)
2073{
2074 EV_CB_INVOKE ((W)w, revents);
2075}
2076
2077unsigned int
2078ev_pending_count (EV_P)
2079{
2080 int pri;
2081 unsigned int count = 0;
2082
2083 for (pri = NUMPRI; pri--; )
2084 count += pendingcnt [pri];
2085
2086 return count;
2087}
2088
2089void noinline
2090ev_invoke_pending (EV_P)
2091{
2092 int pri;
2093
2094 for (pri = NUMPRI; pri--; )
2095 while (pendingcnt [pri])
2096 {
2097 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2098
2099 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
2100 /* ^ this is no longer true, as pending_w could be here */
2101
2102 p->w->pending = 0;
2103 EV_CB_INVOKE (p->w, p->events);
2104 EV_FREQUENT_CHECK;
2105 }
2106}
2107
2108#if EV_IDLE_ENABLE
2109/* make idle watchers pending. this handles the "call-idle */
2110/* only when higher priorities are idle" logic */
2111inline_size void
2112idle_reify (EV_P)
2113{
2114 if (expect_false (idleall))
2115 {
2116 int pri;
2117
2118 for (pri = NUMPRI; pri--; )
2119 {
2120 if (pendingcnt [pri])
2121 break;
2122
2123 if (idlecnt [pri])
2124 {
2125 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2126 break;
2127 }
2128 }
2129 }
2130}
2131#endif
2132
2133/* make timers pending */
2134inline_size void
418timers_reify () 2135timers_reify (EV_P)
419{ 2136{
420 while (timercnt && timers [0]->at <= now) 2137 EV_FREQUENT_CHECK;
421 {
422 struct ev_timer *w = timers [0];
423 2138
2139 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2140 {
2141 do
2142 {
2143 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2144
2145 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2146
424 /* first reschedule or stop timer */ 2147 /* first reschedule or stop timer */
2148 if (w->repeat)
2149 {
2150 ev_at (w) += w->repeat;
2151 if (ev_at (w) < mn_now)
2152 ev_at (w) = mn_now;
2153
2154 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2155
2156 ANHE_at_cache (timers [HEAP0]);
2157 downheap (timers, timercnt, HEAP0);
2158 }
2159 else
2160 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2161
2162 EV_FREQUENT_CHECK;
2163 feed_reverse (EV_A_ (W)w);
2164 }
2165 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2166
2167 feed_reverse_done (EV_A_ EV_TIMER);
2168 }
2169}
2170
2171#if EV_PERIODIC_ENABLE
2172/* make periodics pending */
2173inline_size void
2174periodics_reify (EV_P)
2175{
2176 EV_FREQUENT_CHECK;
2177
2178 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2179 {
2180 int feed_count = 0;
2181
2182 do
2183 {
2184 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2185
2186 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2187
2188 /* first reschedule or stop timer */
2189 if (w->reschedule_cb)
2190 {
2191 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2192
2193 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2194
2195 ANHE_at_cache (periodics [HEAP0]);
2196 downheap (periodics, periodiccnt, HEAP0);
2197 }
2198 else if (w->interval)
2199 {
2200 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2201 /* if next trigger time is not sufficiently in the future, put it there */
2202 /* this might happen because of floating point inexactness */
2203 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2204 {
2205 ev_at (w) += w->interval;
2206
2207 /* if interval is unreasonably low we might still have a time in the past */
2208 /* so correct this. this will make the periodic very inexact, but the user */
2209 /* has effectively asked to get triggered more often than possible */
2210 if (ev_at (w) < ev_rt_now)
2211 ev_at (w) = ev_rt_now;
2212 }
2213
2214 ANHE_at_cache (periodics [HEAP0]);
2215 downheap (periodics, periodiccnt, HEAP0);
2216 }
2217 else
2218 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2219
2220 EV_FREQUENT_CHECK;
2221 feed_reverse (EV_A_ (W)w);
2222 }
2223 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2224
2225 feed_reverse_done (EV_A_ EV_PERIODIC);
2226 }
2227}
2228
2229/* simply recalculate all periodics */
2230/* TODO: maybe ensure that at least one event happens when jumping forward? */
2231static void noinline
2232periodics_reschedule (EV_P)
2233{
2234 int i;
2235
2236 /* adjust periodics after time jump */
2237 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2238 {
2239 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2240
2241 if (w->reschedule_cb)
2242 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2243 else if (w->interval)
2244 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2245
2246 ANHE_at_cache (periodics [i]);
2247 }
2248
2249 reheap (periodics, periodiccnt);
2250}
2251#endif
2252
2253/* adjust all timers by a given offset */
2254static void noinline
2255timers_reschedule (EV_P_ ev_tstamp adjust)
2256{
2257 int i;
2258
2259 for (i = 0; i < timercnt; ++i)
2260 {
2261 ANHE *he = timers + i + HEAP0;
2262 ANHE_w (*he)->at += adjust;
2263 ANHE_at_cache (*he);
2264 }
2265}
2266
2267/* fetch new monotonic and realtime times from the kernel */
2268/* also detect if there was a timejump, and act accordingly */
2269inline_speed void
2270time_update (EV_P_ ev_tstamp max_block)
2271{
2272#if EV_USE_MONOTONIC
2273 if (expect_true (have_monotonic))
2274 {
2275 int i;
2276 ev_tstamp odiff = rtmn_diff;
2277
2278 mn_now = get_clock ();
2279
2280 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2281 /* interpolate in the meantime */
2282 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2283 {
2284 ev_rt_now = rtmn_diff + mn_now;
2285 return;
2286 }
2287
2288 now_floor = mn_now;
2289 ev_rt_now = ev_time ();
2290
2291 /* loop a few times, before making important decisions.
2292 * on the choice of "4": one iteration isn't enough,
2293 * in case we get preempted during the calls to
2294 * ev_time and get_clock. a second call is almost guaranteed
2295 * to succeed in that case, though. and looping a few more times
2296 * doesn't hurt either as we only do this on time-jumps or
2297 * in the unlikely event of having been preempted here.
2298 */
2299 for (i = 4; --i; )
2300 {
2301 rtmn_diff = ev_rt_now - mn_now;
2302
2303 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2304 return; /* all is well */
2305
2306 ev_rt_now = ev_time ();
2307 mn_now = get_clock ();
2308 now_floor = mn_now;
2309 }
2310
2311 /* no timer adjustment, as the monotonic clock doesn't jump */
2312 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2313# if EV_PERIODIC_ENABLE
2314 periodics_reschedule (EV_A);
2315# endif
2316 }
2317 else
2318#endif
2319 {
2320 ev_rt_now = ev_time ();
2321
2322 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2323 {
2324 /* adjust timers. this is easy, as the offset is the same for all of them */
2325 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2326#if EV_PERIODIC_ENABLE
2327 periodics_reschedule (EV_A);
2328#endif
2329 }
2330
2331 mn_now = ev_rt_now;
2332 }
2333}
2334
2335void
2336ev_run (EV_P_ int flags)
2337{
2338#if EV_FEATURE_API
2339 ++loop_depth;
2340#endif
2341
2342 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2343
2344 loop_done = EVBREAK_CANCEL;
2345
2346 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2347
2348 do
2349 {
2350#if EV_VERIFY >= 2
2351 ev_verify (EV_A);
2352#endif
2353
2354#ifndef _WIN32
2355 if (expect_false (curpid)) /* penalise the forking check even more */
2356 if (expect_false (getpid () != curpid))
2357 {
2358 curpid = getpid ();
2359 postfork = 1;
2360 }
2361#endif
2362
2363#if EV_FORK_ENABLE
2364 /* we might have forked, so queue fork handlers */
2365 if (expect_false (postfork))
2366 if (forkcnt)
2367 {
2368 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2369 EV_INVOKE_PENDING;
2370 }
2371#endif
2372
2373#if EV_PREPARE_ENABLE
2374 /* queue prepare watchers (and execute them) */
2375 if (expect_false (preparecnt))
2376 {
2377 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2378 EV_INVOKE_PENDING;
2379 }
2380#endif
2381
2382 if (expect_false (loop_done))
2383 break;
2384
2385 /* we might have forked, so reify kernel state if necessary */
2386 if (expect_false (postfork))
2387 loop_fork (EV_A);
2388
2389 /* update fd-related kernel structures */
2390 fd_reify (EV_A);
2391
2392 /* calculate blocking time */
2393 {
2394 ev_tstamp waittime = 0.;
2395 ev_tstamp sleeptime = 0.;
2396
2397 /* remember old timestamp for io_blocktime calculation */
2398 ev_tstamp prev_mn_now = mn_now;
2399
2400 /* update time to cancel out callback processing overhead */
2401 time_update (EV_A_ 1e100);
2402
2403 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt)))
2404 {
2405 waittime = MAX_BLOCKTIME;
2406
2407 if (timercnt)
2408 {
2409 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2410 if (waittime > to) waittime = to;
2411 }
2412
2413#if EV_PERIODIC_ENABLE
2414 if (periodiccnt)
2415 {
2416 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2417 if (waittime > to) waittime = to;
2418 }
2419#endif
2420
2421 /* don't let timeouts decrease the waittime below timeout_blocktime */
2422 if (expect_false (waittime < timeout_blocktime))
2423 waittime = timeout_blocktime;
2424
2425 /* extra check because io_blocktime is commonly 0 */
2426 if (expect_false (io_blocktime))
2427 {
2428 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2429
2430 if (sleeptime > waittime - backend_fudge)
2431 sleeptime = waittime - backend_fudge;
2432
2433 if (expect_true (sleeptime > 0.))
2434 {
2435 ev_sleep (sleeptime);
2436 waittime -= sleeptime;
2437 }
2438 }
2439 }
2440
2441#if EV_FEATURE_API
2442 ++loop_count;
2443#endif
2444 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2445 backend_poll (EV_A_ waittime);
2446 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2447
2448 /* update ev_rt_now, do magic */
2449 time_update (EV_A_ waittime + sleeptime);
2450 }
2451
2452 /* queue pending timers and reschedule them */
2453 timers_reify (EV_A); /* relative timers called last */
2454#if EV_PERIODIC_ENABLE
2455 periodics_reify (EV_A); /* absolute timers called first */
2456#endif
2457
2458#if EV_IDLE_ENABLE
2459 /* queue idle watchers unless other events are pending */
2460 idle_reify (EV_A);
2461#endif
2462
2463#if EV_CHECK_ENABLE
2464 /* queue check watchers, to be executed first */
2465 if (expect_false (checkcnt))
2466 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2467#endif
2468
2469 EV_INVOKE_PENDING;
2470 }
2471 while (expect_true (
2472 activecnt
2473 && !loop_done
2474 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2475 ));
2476
2477 if (loop_done == EVBREAK_ONE)
2478 loop_done = EVBREAK_CANCEL;
2479
2480#if EV_FEATURE_API
2481 --loop_depth;
2482#endif
2483}
2484
2485void
2486ev_break (EV_P_ int how)
2487{
2488 loop_done = how;
2489}
2490
2491void
2492ev_ref (EV_P)
2493{
2494 ++activecnt;
2495}
2496
2497void
2498ev_unref (EV_P)
2499{
2500 --activecnt;
2501}
2502
2503void
2504ev_now_update (EV_P)
2505{
2506 time_update (EV_A_ 1e100);
2507}
2508
2509void
2510ev_suspend (EV_P)
2511{
2512 ev_now_update (EV_A);
2513}
2514
2515void
2516ev_resume (EV_P)
2517{
2518 ev_tstamp mn_prev = mn_now;
2519
2520 ev_now_update (EV_A);
2521 timers_reschedule (EV_A_ mn_now - mn_prev);
2522#if EV_PERIODIC_ENABLE
2523 /* TODO: really do this? */
2524 periodics_reschedule (EV_A);
2525#endif
2526}
2527
2528/*****************************************************************************/
2529/* singly-linked list management, used when the expected list length is short */
2530
2531inline_size void
2532wlist_add (WL *head, WL elem)
2533{
2534 elem->next = *head;
2535 *head = elem;
2536}
2537
2538inline_size void
2539wlist_del (WL *head, WL elem)
2540{
2541 while (*head)
2542 {
2543 if (expect_true (*head == elem))
2544 {
2545 *head = elem->next;
2546 break;
2547 }
2548
2549 head = &(*head)->next;
2550 }
2551}
2552
2553/* internal, faster, version of ev_clear_pending */
2554inline_speed void
2555clear_pending (EV_P_ W w)
2556{
2557 if (w->pending)
2558 {
2559 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2560 w->pending = 0;
2561 }
2562}
2563
2564int
2565ev_clear_pending (EV_P_ void *w)
2566{
2567 W w_ = (W)w;
2568 int pending = w_->pending;
2569
2570 if (expect_true (pending))
2571 {
2572 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2573 p->w = (W)&pending_w;
2574 w_->pending = 0;
2575 return p->events;
2576 }
2577 else
2578 return 0;
2579}
2580
2581inline_size void
2582pri_adjust (EV_P_ W w)
2583{
2584 int pri = ev_priority (w);
2585 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2586 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2587 ev_set_priority (w, pri);
2588}
2589
2590inline_speed void
2591ev_start (EV_P_ W w, int active)
2592{
2593 pri_adjust (EV_A_ w);
2594 w->active = active;
2595 ev_ref (EV_A);
2596}
2597
2598inline_size void
2599ev_stop (EV_P_ W w)
2600{
2601 ev_unref (EV_A);
2602 w->active = 0;
2603}
2604
2605/*****************************************************************************/
2606
2607void noinline
2608ev_io_start (EV_P_ ev_io *w)
2609{
2610 int fd = w->fd;
2611
2612 if (expect_false (ev_is_active (w)))
2613 return;
2614
2615 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2616 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2617
2618 EV_FREQUENT_CHECK;
2619
2620 ev_start (EV_A_ (W)w, 1);
2621 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2622 wlist_add (&anfds[fd].head, (WL)w);
2623
2624 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2625 w->events &= ~EV__IOFDSET;
2626
2627 EV_FREQUENT_CHECK;
2628}
2629
2630void noinline
2631ev_io_stop (EV_P_ ev_io *w)
2632{
2633 clear_pending (EV_A_ (W)w);
2634 if (expect_false (!ev_is_active (w)))
2635 return;
2636
2637 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2638
2639 EV_FREQUENT_CHECK;
2640
2641 wlist_del (&anfds[w->fd].head, (WL)w);
2642 ev_stop (EV_A_ (W)w);
2643
2644 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2645
2646 EV_FREQUENT_CHECK;
2647}
2648
2649void noinline
2650ev_timer_start (EV_P_ ev_timer *w)
2651{
2652 if (expect_false (ev_is_active (w)))
2653 return;
2654
2655 ev_at (w) += mn_now;
2656
2657 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2658
2659 EV_FREQUENT_CHECK;
2660
2661 ++timercnt;
2662 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2663 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2664 ANHE_w (timers [ev_active (w)]) = (WT)w;
2665 ANHE_at_cache (timers [ev_active (w)]);
2666 upheap (timers, ev_active (w));
2667
2668 EV_FREQUENT_CHECK;
2669
2670 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2671}
2672
2673void noinline
2674ev_timer_stop (EV_P_ ev_timer *w)
2675{
2676 clear_pending (EV_A_ (W)w);
2677 if (expect_false (!ev_is_active (w)))
2678 return;
2679
2680 EV_FREQUENT_CHECK;
2681
2682 {
2683 int active = ev_active (w);
2684
2685 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2686
2687 --timercnt;
2688
2689 if (expect_true (active < timercnt + HEAP0))
2690 {
2691 timers [active] = timers [timercnt + HEAP0];
2692 adjustheap (timers, timercnt, active);
2693 }
2694 }
2695
2696 ev_at (w) -= mn_now;
2697
2698 ev_stop (EV_A_ (W)w);
2699
2700 EV_FREQUENT_CHECK;
2701}
2702
2703void noinline
2704ev_timer_again (EV_P_ ev_timer *w)
2705{
2706 EV_FREQUENT_CHECK;
2707
2708 if (ev_is_active (w))
2709 {
425 if (w->repeat) 2710 if (w->repeat)
426 { 2711 {
427 w->at = now + w->repeat; 2712 ev_at (w) = mn_now + w->repeat;
428 assert (("timer timeout in the past, negative repeat?", w->at > now)); 2713 ANHE_at_cache (timers [ev_active (w)]);
429 downheap ((WT *)timers, timercnt, 0); 2714 adjustheap (timers, timercnt, ev_active (w));
430 } 2715 }
431 else 2716 else
432 evtimer_stop (w); /* nonrepeating: stop timer */ 2717 ev_timer_stop (EV_A_ w);
433
434 event ((W)w, EV_TIMEOUT);
435 }
436}
437
438static void
439periodics_reify ()
440{
441 while (periodiccnt && periodics [0]->at <= ev_now)
442 { 2718 }
443 struct ev_periodic *w = periodics [0]; 2719 else if (w->repeat)
2720 {
2721 ev_at (w) = w->repeat;
2722 ev_timer_start (EV_A_ w);
2723 }
444 2724
445 /* first reschedule or stop timer */ 2725 EV_FREQUENT_CHECK;
2726}
2727
2728ev_tstamp
2729ev_timer_remaining (EV_P_ ev_timer *w)
2730{
2731 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2732}
2733
2734#if EV_PERIODIC_ENABLE
2735void noinline
2736ev_periodic_start (EV_P_ ev_periodic *w)
2737{
2738 if (expect_false (ev_is_active (w)))
2739 return;
2740
2741 if (w->reschedule_cb)
2742 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
446 if (w->interval) 2743 else if (w->interval)
2744 {
2745 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2746 /* this formula differs from the one in periodic_reify because we do not always round up */
2747 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2748 }
2749 else
2750 ev_at (w) = w->offset;
2751
2752 EV_FREQUENT_CHECK;
2753
2754 ++periodiccnt;
2755 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2756 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2757 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2758 ANHE_at_cache (periodics [ev_active (w)]);
2759 upheap (periodics, ev_active (w));
2760
2761 EV_FREQUENT_CHECK;
2762
2763 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2764}
2765
2766void noinline
2767ev_periodic_stop (EV_P_ ev_periodic *w)
2768{
2769 clear_pending (EV_A_ (W)w);
2770 if (expect_false (!ev_is_active (w)))
2771 return;
2772
2773 EV_FREQUENT_CHECK;
2774
2775 {
2776 int active = ev_active (w);
2777
2778 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2779
2780 --periodiccnt;
2781
2782 if (expect_true (active < periodiccnt + HEAP0))
2783 {
2784 periodics [active] = periodics [periodiccnt + HEAP0];
2785 adjustheap (periodics, periodiccnt, active);
2786 }
2787 }
2788
2789 ev_stop (EV_A_ (W)w);
2790
2791 EV_FREQUENT_CHECK;
2792}
2793
2794void noinline
2795ev_periodic_again (EV_P_ ev_periodic *w)
2796{
2797 /* TODO: use adjustheap and recalculation */
2798 ev_periodic_stop (EV_A_ w);
2799 ev_periodic_start (EV_A_ w);
2800}
2801#endif
2802
2803#ifndef SA_RESTART
2804# define SA_RESTART 0
2805#endif
2806
2807#if EV_SIGNAL_ENABLE
2808
2809void noinline
2810ev_signal_start (EV_P_ ev_signal *w)
2811{
2812 if (expect_false (ev_is_active (w)))
2813 return;
2814
2815 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2816
2817#if EV_MULTIPLICITY
2818 assert (("libev: a signal must not be attached to two different loops",
2819 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2820
2821 signals [w->signum - 1].loop = EV_A;
2822#endif
2823
2824 EV_FREQUENT_CHECK;
2825
2826#if EV_USE_SIGNALFD
2827 if (sigfd == -2)
2828 {
2829 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2830 if (sigfd < 0 && errno == EINVAL)
2831 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2832
2833 if (sigfd >= 0)
447 { 2834 {
448 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 2835 fd_intern (sigfd); /* doing it twice will not hurt */
449 assert (("periodic timeout in the past, negative interval?", w->at > ev_now)); 2836
450 downheap ((WT *)periodics, periodiccnt, 0); 2837 sigemptyset (&sigfd_set);
2838
2839 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2840 ev_set_priority (&sigfd_w, EV_MAXPRI);
2841 ev_io_start (EV_A_ &sigfd_w);
2842 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2843 }
2844 }
2845
2846 if (sigfd >= 0)
2847 {
2848 /* TODO: check .head */
2849 sigaddset (&sigfd_set, w->signum);
2850 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2851
2852 signalfd (sigfd, &sigfd_set, 0);
2853 }
2854#endif
2855
2856 ev_start (EV_A_ (W)w, 1);
2857 wlist_add (&signals [w->signum - 1].head, (WL)w);
2858
2859 if (!((WL)w)->next)
2860# if EV_USE_SIGNALFD
2861 if (sigfd < 0) /*TODO*/
2862# endif
2863 {
2864# ifdef _WIN32
2865 evpipe_init (EV_A);
2866
2867 signal (w->signum, ev_sighandler);
2868# else
2869 struct sigaction sa;
2870
2871 evpipe_init (EV_A);
2872
2873 sa.sa_handler = ev_sighandler;
2874 sigfillset (&sa.sa_mask);
2875 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2876 sigaction (w->signum, &sa, 0);
2877
2878 sigemptyset (&sa.sa_mask);
2879 sigaddset (&sa.sa_mask, w->signum);
2880 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2881#endif
2882 }
2883
2884 EV_FREQUENT_CHECK;
2885}
2886
2887void noinline
2888ev_signal_stop (EV_P_ ev_signal *w)
2889{
2890 clear_pending (EV_A_ (W)w);
2891 if (expect_false (!ev_is_active (w)))
2892 return;
2893
2894 EV_FREQUENT_CHECK;
2895
2896 wlist_del (&signals [w->signum - 1].head, (WL)w);
2897 ev_stop (EV_A_ (W)w);
2898
2899 if (!signals [w->signum - 1].head)
2900 {
2901#if EV_MULTIPLICITY
2902 signals [w->signum - 1].loop = 0; /* unattach from signal */
2903#endif
2904#if EV_USE_SIGNALFD
2905 if (sigfd >= 0)
2906 {
2907 sigset_t ss;
2908
2909 sigemptyset (&ss);
2910 sigaddset (&ss, w->signum);
2911 sigdelset (&sigfd_set, w->signum);
2912
2913 signalfd (sigfd, &sigfd_set, 0);
2914 sigprocmask (SIG_UNBLOCK, &ss, 0);
451 } 2915 }
452 else 2916 else
453 evperiodic_stop (w); /* nonrepeating: stop timer */ 2917#endif
454 2918 signal (w->signum, SIG_DFL);
455 event ((W)w, EV_TIMEOUT);
456 }
457}
458
459static void
460time_jump (ev_tstamp diff)
461{
462 int i;
463
464 /* adjust periodics */
465 for (i = 0; i < periodiccnt; ++i)
466 { 2919 }
467 struct ev_periodic *w = periodics [i];
468 2920
469 if (w->interval) 2921 EV_FREQUENT_CHECK;
2922}
2923
2924#endif
2925
2926#if EV_CHILD_ENABLE
2927
2928void
2929ev_child_start (EV_P_ ev_child *w)
2930{
2931#if EV_MULTIPLICITY
2932 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2933#endif
2934 if (expect_false (ev_is_active (w)))
2935 return;
2936
2937 EV_FREQUENT_CHECK;
2938
2939 ev_start (EV_A_ (W)w, 1);
2940 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2941
2942 EV_FREQUENT_CHECK;
2943}
2944
2945void
2946ev_child_stop (EV_P_ ev_child *w)
2947{
2948 clear_pending (EV_A_ (W)w);
2949 if (expect_false (!ev_is_active (w)))
2950 return;
2951
2952 EV_FREQUENT_CHECK;
2953
2954 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2955 ev_stop (EV_A_ (W)w);
2956
2957 EV_FREQUENT_CHECK;
2958}
2959
2960#endif
2961
2962#if EV_STAT_ENABLE
2963
2964# ifdef _WIN32
2965# undef lstat
2966# define lstat(a,b) _stati64 (a,b)
2967# endif
2968
2969#define DEF_STAT_INTERVAL 5.0074891
2970#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2971#define MIN_STAT_INTERVAL 0.1074891
2972
2973static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2974
2975#if EV_USE_INOTIFY
2976
2977/* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
2978# define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
2979
2980static void noinline
2981infy_add (EV_P_ ev_stat *w)
2982{
2983 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);
2984
2985 if (w->wd >= 0)
2986 {
2987 struct statfs sfs;
2988
2989 /* now local changes will be tracked by inotify, but remote changes won't */
2990 /* unless the filesystem is known to be local, we therefore still poll */
2991 /* also do poll on <2.6.25, but with normal frequency */
2992
2993 if (!fs_2625)
2994 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2995 else if (!statfs (w->path, &sfs)
2996 && (sfs.f_type == 0x1373 /* devfs */
2997 || sfs.f_type == 0xEF53 /* ext2/3 */
2998 || sfs.f_type == 0x3153464a /* jfs */
2999 || sfs.f_type == 0x52654973 /* reiser3 */
3000 || sfs.f_type == 0x01021994 /* tempfs */
3001 || sfs.f_type == 0x58465342 /* xfs */))
3002 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3003 else
3004 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3005 }
3006 else
3007 {
3008 /* can't use inotify, continue to stat */
3009 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3010
3011 /* if path is not there, monitor some parent directory for speedup hints */
3012 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3013 /* but an efficiency issue only */
3014 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
470 { 3015 {
471 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 3016 char path [4096];
3017 strcpy (path, w->path);
472 3018
473 if (fabs (diff) >= 1e-4) 3019 do
474 { 3020 {
475 evperiodic_stop (w); 3021 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
476 evperiodic_start (w); 3022 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
477 3023
478 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 3024 char *pend = strrchr (path, '/');
3025
3026 if (!pend || pend == path)
3027 break;
3028
3029 *pend = 0;
3030 w->wd = inotify_add_watch (fs_fd, path, mask);
3031 }
3032 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3033 }
3034 }
3035
3036 if (w->wd >= 0)
3037 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3038
3039 /* now re-arm timer, if required */
3040 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3041 ev_timer_again (EV_A_ &w->timer);
3042 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3043}
3044
3045static void noinline
3046infy_del (EV_P_ ev_stat *w)
3047{
3048 int slot;
3049 int wd = w->wd;
3050
3051 if (wd < 0)
3052 return;
3053
3054 w->wd = -2;
3055 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3056 wlist_del (&fs_hash [slot].head, (WL)w);
3057
3058 /* remove this watcher, if others are watching it, they will rearm */
3059 inotify_rm_watch (fs_fd, wd);
3060}
3061
3062static void noinline
3063infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3064{
3065 if (slot < 0)
3066 /* overflow, need to check for all hash slots */
3067 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3068 infy_wd (EV_A_ slot, wd, ev);
3069 else
3070 {
3071 WL w_;
3072
3073 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3074 {
3075 ev_stat *w = (ev_stat *)w_;
3076 w_ = w_->next; /* lets us remove this watcher and all before it */
3077
3078 if (w->wd == wd || wd == -1)
3079 {
3080 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3081 {
3082 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3083 w->wd = -1;
3084 infy_add (EV_A_ w); /* re-add, no matter what */
3085 }
3086
3087 stat_timer_cb (EV_A_ &w->timer, 0);
479 } 3088 }
480 } 3089 }
481 } 3090 }
482
483 /* adjust timers. this is easy, as the offset is the same for all */
484 for (i = 0; i < timercnt; ++i)
485 timers [i]->at += diff;
486} 3091}
487 3092
488static void 3093static void
489time_update () 3094infy_cb (EV_P_ ev_io *w, int revents)
490{ 3095{
3096 char buf [EV_INOTIFY_BUFSIZE];
491 int i; 3097 int ofs;
3098 int len = read (fs_fd, buf, sizeof (buf));
492 3099
493 ev_now = ev_time (); 3100 for (ofs = 0; ofs < len; )
494 3101 {
495 if (have_monotonic) 3102 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3103 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3104 ofs += sizeof (struct inotify_event) + ev->len;
496 { 3105 }
497 ev_tstamp odiff = diff; 3106}
498 3107
499 for (i = 4; --i; ) /* loop a few times, before making important decisions */ 3108inline_size void
3109ev_check_2625 (EV_P)
3110{
3111 /* kernels < 2.6.25 are borked
3112 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3113 */
3114 if (ev_linux_version () < 0x020619)
3115 return;
3116
3117 fs_2625 = 1;
3118}
3119
3120inline_size int
3121infy_newfd (void)
3122{
3123#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3124 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3125 if (fd >= 0)
3126 return fd;
3127#endif
3128 return inotify_init ();
3129}
3130
3131inline_size void
3132infy_init (EV_P)
3133{
3134 if (fs_fd != -2)
3135 return;
3136
3137 fs_fd = -1;
3138
3139 ev_check_2625 (EV_A);
3140
3141 fs_fd = infy_newfd ();
3142
3143 if (fs_fd >= 0)
3144 {
3145 fd_intern (fs_fd);
3146 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3147 ev_set_priority (&fs_w, EV_MAXPRI);
3148 ev_io_start (EV_A_ &fs_w);
3149 ev_unref (EV_A);
3150 }
3151}
3152
3153inline_size void
3154infy_fork (EV_P)
3155{
3156 int slot;
3157
3158 if (fs_fd < 0)
3159 return;
3160
3161 ev_ref (EV_A);
3162 ev_io_stop (EV_A_ &fs_w);
3163 close (fs_fd);
3164 fs_fd = infy_newfd ();
3165
3166 if (fs_fd >= 0)
3167 {
3168 fd_intern (fs_fd);
3169 ev_io_set (&fs_w, fs_fd, EV_READ);
3170 ev_io_start (EV_A_ &fs_w);
3171 ev_unref (EV_A);
3172 }
3173
3174 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3175 {
3176 WL w_ = fs_hash [slot].head;
3177 fs_hash [slot].head = 0;
3178
3179 while (w_)
500 { 3180 {
501 now = get_clock (); 3181 ev_stat *w = (ev_stat *)w_;
502 diff = ev_now - now; 3182 w_ = w_->next; /* lets us add this watcher */
503 3183
504 if (fabs (odiff - diff) < MIN_TIMEJUMP) 3184 w->wd = -1;
505 return; /* all is well */
506 3185
507 ev_now = ev_time (); 3186 if (fs_fd >= 0)
3187 infy_add (EV_A_ w); /* re-add, no matter what */
3188 else
3189 {
3190 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3191 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3192 ev_timer_again (EV_A_ &w->timer);
3193 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3194 }
508 } 3195 }
509
510 time_jump (diff - odiff);
511 } 3196 }
3197}
3198
3199#endif
3200
3201#ifdef _WIN32
3202# define EV_LSTAT(p,b) _stati64 (p, b)
3203#else
3204# define EV_LSTAT(p,b) lstat (p, b)
3205#endif
3206
3207void
3208ev_stat_stat (EV_P_ ev_stat *w)
3209{
3210 if (lstat (w->path, &w->attr) < 0)
3211 w->attr.st_nlink = 0;
3212 else if (!w->attr.st_nlink)
3213 w->attr.st_nlink = 1;
3214}
3215
3216static void noinline
3217stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3218{
3219 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3220
3221 ev_statdata prev = w->attr;
3222 ev_stat_stat (EV_A_ w);
3223
3224 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3225 if (
3226 prev.st_dev != w->attr.st_dev
3227 || prev.st_ino != w->attr.st_ino
3228 || prev.st_mode != w->attr.st_mode
3229 || prev.st_nlink != w->attr.st_nlink
3230 || prev.st_uid != w->attr.st_uid
3231 || prev.st_gid != w->attr.st_gid
3232 || prev.st_rdev != w->attr.st_rdev
3233 || prev.st_size != w->attr.st_size
3234 || prev.st_atime != w->attr.st_atime
3235 || prev.st_mtime != w->attr.st_mtime
3236 || prev.st_ctime != w->attr.st_ctime
3237 ) {
3238 /* we only update w->prev on actual differences */
3239 /* in case we test more often than invoke the callback, */
3240 /* to ensure that prev is always different to attr */
3241 w->prev = prev;
3242
3243 #if EV_USE_INOTIFY
3244 if (fs_fd >= 0)
3245 {
3246 infy_del (EV_A_ w);
3247 infy_add (EV_A_ w);
3248 ev_stat_stat (EV_A_ w); /* avoid race... */
3249 }
3250 #endif
3251
3252 ev_feed_event (EV_A_ w, EV_STAT);
3253 }
3254}
3255
3256void
3257ev_stat_start (EV_P_ ev_stat *w)
3258{
3259 if (expect_false (ev_is_active (w)))
3260 return;
3261
3262 ev_stat_stat (EV_A_ w);
3263
3264 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3265 w->interval = MIN_STAT_INTERVAL;
3266
3267 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3268 ev_set_priority (&w->timer, ev_priority (w));
3269
3270#if EV_USE_INOTIFY
3271 infy_init (EV_A);
3272
3273 if (fs_fd >= 0)
3274 infy_add (EV_A_ w);
512 else 3275 else
3276#endif
3277 {
3278 ev_timer_again (EV_A_ &w->timer);
3279 ev_unref (EV_A);
3280 }
3281
3282 ev_start (EV_A_ (W)w, 1);
3283
3284 EV_FREQUENT_CHECK;
3285}
3286
3287void
3288ev_stat_stop (EV_P_ ev_stat *w)
3289{
3290 clear_pending (EV_A_ (W)w);
3291 if (expect_false (!ev_is_active (w)))
3292 return;
3293
3294 EV_FREQUENT_CHECK;
3295
3296#if EV_USE_INOTIFY
3297 infy_del (EV_A_ w);
3298#endif
3299
3300 if (ev_is_active (&w->timer))
3301 {
3302 ev_ref (EV_A);
3303 ev_timer_stop (EV_A_ &w->timer);
3304 }
3305
3306 ev_stop (EV_A_ (W)w);
3307
3308 EV_FREQUENT_CHECK;
3309}
3310#endif
3311
3312#if EV_IDLE_ENABLE
3313void
3314ev_idle_start (EV_P_ ev_idle *w)
3315{
3316 if (expect_false (ev_is_active (w)))
3317 return;
3318
3319 pri_adjust (EV_A_ (W)w);
3320
3321 EV_FREQUENT_CHECK;
3322
3323 {
3324 int active = ++idlecnt [ABSPRI (w)];
3325
3326 ++idleall;
3327 ev_start (EV_A_ (W)w, active);
3328
3329 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3330 idles [ABSPRI (w)][active - 1] = w;
3331 }
3332
3333 EV_FREQUENT_CHECK;
3334}
3335
3336void
3337ev_idle_stop (EV_P_ ev_idle *w)
3338{
3339 clear_pending (EV_A_ (W)w);
3340 if (expect_false (!ev_is_active (w)))
3341 return;
3342
3343 EV_FREQUENT_CHECK;
3344
3345 {
3346 int active = ev_active (w);
3347
3348 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3349 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3350
3351 ev_stop (EV_A_ (W)w);
3352 --idleall;
3353 }
3354
3355 EV_FREQUENT_CHECK;
3356}
3357#endif
3358
3359#if EV_PREPARE_ENABLE
3360void
3361ev_prepare_start (EV_P_ ev_prepare *w)
3362{
3363 if (expect_false (ev_is_active (w)))
3364 return;
3365
3366 EV_FREQUENT_CHECK;
3367
3368 ev_start (EV_A_ (W)w, ++preparecnt);
3369 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3370 prepares [preparecnt - 1] = w;
3371
3372 EV_FREQUENT_CHECK;
3373}
3374
3375void
3376ev_prepare_stop (EV_P_ ev_prepare *w)
3377{
3378 clear_pending (EV_A_ (W)w);
3379 if (expect_false (!ev_is_active (w)))
3380 return;
3381
3382 EV_FREQUENT_CHECK;
3383
3384 {
3385 int active = ev_active (w);
3386
3387 prepares [active - 1] = prepares [--preparecnt];
3388 ev_active (prepares [active - 1]) = active;
3389 }
3390
3391 ev_stop (EV_A_ (W)w);
3392
3393 EV_FREQUENT_CHECK;
3394}
3395#endif
3396
3397#if EV_CHECK_ENABLE
3398void
3399ev_check_start (EV_P_ ev_check *w)
3400{
3401 if (expect_false (ev_is_active (w)))
3402 return;
3403
3404 EV_FREQUENT_CHECK;
3405
3406 ev_start (EV_A_ (W)w, ++checkcnt);
3407 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3408 checks [checkcnt - 1] = w;
3409
3410 EV_FREQUENT_CHECK;
3411}
3412
3413void
3414ev_check_stop (EV_P_ ev_check *w)
3415{
3416 clear_pending (EV_A_ (W)w);
3417 if (expect_false (!ev_is_active (w)))
3418 return;
3419
3420 EV_FREQUENT_CHECK;
3421
3422 {
3423 int active = ev_active (w);
3424
3425 checks [active - 1] = checks [--checkcnt];
3426 ev_active (checks [active - 1]) = active;
3427 }
3428
3429 ev_stop (EV_A_ (W)w);
3430
3431 EV_FREQUENT_CHECK;
3432}
3433#endif
3434
3435#if EV_EMBED_ENABLE
3436void noinline
3437ev_embed_sweep (EV_P_ ev_embed *w)
3438{
3439 ev_run (w->other, EVRUN_NOWAIT);
3440}
3441
3442static void
3443embed_io_cb (EV_P_ ev_io *io, int revents)
3444{
3445 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3446
3447 if (ev_cb (w))
3448 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3449 else
3450 ev_run (w->other, EVRUN_NOWAIT);
3451}
3452
3453static void
3454embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3455{
3456 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3457
3458 {
3459 EV_P = w->other;
3460
3461 while (fdchangecnt)
513 { 3462 {
514 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
515 time_jump (ev_now - now);
516
517 now = ev_now;
518 }
519}
520
521int ev_loop_done;
522
523void ev_loop (int flags)
524{
525 double block;
526 ev_loop_done = flags & EVLOOP_ONESHOT;
527
528 if (checkcnt)
529 {
530 queue_events ((W *)checks, checkcnt, EV_CHECK);
531 call_pending ();
532 }
533
534 do
535 {
536 /* update fd-related kernel structures */
537 fd_reify (); 3463 fd_reify (EV_A);
3464 ev_run (EV_A_ EVRUN_NOWAIT);
3465 }
3466 }
3467}
538 3468
539 /* calculate blocking time */ 3469static void
3470embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3471{
3472 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
540 3473
541 /* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */ 3474 ev_embed_stop (EV_A_ w);
542 ev_now = ev_time ();
543 3475
544 if (flags & EVLOOP_NONBLOCK || idlecnt) 3476 {
545 block = 0.; 3477 EV_P = w->other;
3478
3479 ev_loop_fork (EV_A);
3480 ev_run (EV_A_ EVRUN_NOWAIT);
3481 }
3482
3483 ev_embed_start (EV_A_ w);
3484}
3485
3486#if 0
3487static void
3488embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3489{
3490 ev_idle_stop (EV_A_ idle);
3491}
3492#endif
3493
3494void
3495ev_embed_start (EV_P_ ev_embed *w)
3496{
3497 if (expect_false (ev_is_active (w)))
3498 return;
3499
3500 {
3501 EV_P = w->other;
3502 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3503 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3504 }
3505
3506 EV_FREQUENT_CHECK;
3507
3508 ev_set_priority (&w->io, ev_priority (w));
3509 ev_io_start (EV_A_ &w->io);
3510
3511 ev_prepare_init (&w->prepare, embed_prepare_cb);
3512 ev_set_priority (&w->prepare, EV_MINPRI);
3513 ev_prepare_start (EV_A_ &w->prepare);
3514
3515 ev_fork_init (&w->fork, embed_fork_cb);
3516 ev_fork_start (EV_A_ &w->fork);
3517
3518 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3519
3520 ev_start (EV_A_ (W)w, 1);
3521
3522 EV_FREQUENT_CHECK;
3523}
3524
3525void
3526ev_embed_stop (EV_P_ ev_embed *w)
3527{
3528 clear_pending (EV_A_ (W)w);
3529 if (expect_false (!ev_is_active (w)))
3530 return;
3531
3532 EV_FREQUENT_CHECK;
3533
3534 ev_io_stop (EV_A_ &w->io);
3535 ev_prepare_stop (EV_A_ &w->prepare);
3536 ev_fork_stop (EV_A_ &w->fork);
3537
3538 ev_stop (EV_A_ (W)w);
3539
3540 EV_FREQUENT_CHECK;
3541}
3542#endif
3543
3544#if EV_FORK_ENABLE
3545void
3546ev_fork_start (EV_P_ ev_fork *w)
3547{
3548 if (expect_false (ev_is_active (w)))
3549 return;
3550
3551 EV_FREQUENT_CHECK;
3552
3553 ev_start (EV_A_ (W)w, ++forkcnt);
3554 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3555 forks [forkcnt - 1] = w;
3556
3557 EV_FREQUENT_CHECK;
3558}
3559
3560void
3561ev_fork_stop (EV_P_ ev_fork *w)
3562{
3563 clear_pending (EV_A_ (W)w);
3564 if (expect_false (!ev_is_active (w)))
3565 return;
3566
3567 EV_FREQUENT_CHECK;
3568
3569 {
3570 int active = ev_active (w);
3571
3572 forks [active - 1] = forks [--forkcnt];
3573 ev_active (forks [active - 1]) = active;
3574 }
3575
3576 ev_stop (EV_A_ (W)w);
3577
3578 EV_FREQUENT_CHECK;
3579}
3580#endif
3581
3582#if EV_ASYNC_ENABLE
3583void
3584ev_async_start (EV_P_ ev_async *w)
3585{
3586 if (expect_false (ev_is_active (w)))
3587 return;
3588
3589 w->sent = 0;
3590
3591 evpipe_init (EV_A);
3592
3593 EV_FREQUENT_CHECK;
3594
3595 ev_start (EV_A_ (W)w, ++asynccnt);
3596 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3597 asyncs [asynccnt - 1] = w;
3598
3599 EV_FREQUENT_CHECK;
3600}
3601
3602void
3603ev_async_stop (EV_P_ ev_async *w)
3604{
3605 clear_pending (EV_A_ (W)w);
3606 if (expect_false (!ev_is_active (w)))
3607 return;
3608
3609 EV_FREQUENT_CHECK;
3610
3611 {
3612 int active = ev_active (w);
3613
3614 asyncs [active - 1] = asyncs [--asynccnt];
3615 ev_active (asyncs [active - 1]) = active;
3616 }
3617
3618 ev_stop (EV_A_ (W)w);
3619
3620 EV_FREQUENT_CHECK;
3621}
3622
3623void
3624ev_async_send (EV_P_ ev_async *w)
3625{
3626 w->sent = 1;
3627 evpipe_write (EV_A_ &async_pending);
3628}
3629#endif
3630
3631/*****************************************************************************/
3632
3633struct ev_once
3634{
3635 ev_io io;
3636 ev_timer to;
3637 void (*cb)(int revents, void *arg);
3638 void *arg;
3639};
3640
3641static void
3642once_cb (EV_P_ struct ev_once *once, int revents)
3643{
3644 void (*cb)(int revents, void *arg) = once->cb;
3645 void *arg = once->arg;
3646
3647 ev_io_stop (EV_A_ &once->io);
3648 ev_timer_stop (EV_A_ &once->to);
3649 ev_free (once);
3650
3651 cb (revents, arg);
3652}
3653
3654static void
3655once_cb_io (EV_P_ ev_io *w, int revents)
3656{
3657 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3658
3659 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3660}
3661
3662static void
3663once_cb_to (EV_P_ ev_timer *w, int revents)
3664{
3665 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3666
3667 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3668}
3669
3670void
3671ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3672{
3673 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3674
3675 if (expect_false (!once))
3676 {
3677 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3678 return;
3679 }
3680
3681 once->cb = cb;
3682 once->arg = arg;
3683
3684 ev_init (&once->io, once_cb_io);
3685 if (fd >= 0)
3686 {
3687 ev_io_set (&once->io, fd, events);
3688 ev_io_start (EV_A_ &once->io);
3689 }
3690
3691 ev_init (&once->to, once_cb_to);
3692 if (timeout >= 0.)
3693 {
3694 ev_timer_set (&once->to, timeout, 0.);
3695 ev_timer_start (EV_A_ &once->to);
3696 }
3697}
3698
3699/*****************************************************************************/
3700
3701#if EV_WALK_ENABLE
3702void
3703ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3704{
3705 int i, j;
3706 ev_watcher_list *wl, *wn;
3707
3708 if (types & (EV_IO | EV_EMBED))
3709 for (i = 0; i < anfdmax; ++i)
3710 for (wl = anfds [i].head; wl; )
3711 {
3712 wn = wl->next;
3713
3714#if EV_EMBED_ENABLE
3715 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3716 {
3717 if (types & EV_EMBED)
3718 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3719 }
3720 else
3721#endif
3722#if EV_USE_INOTIFY
3723 if (ev_cb ((ev_io *)wl) == infy_cb)
3724 ;
3725 else
3726#endif
3727 if ((ev_io *)wl != &pipe_w)
3728 if (types & EV_IO)
3729 cb (EV_A_ EV_IO, wl);
3730
3731 wl = wn;
3732 }
3733
3734 if (types & (EV_TIMER | EV_STAT))
3735 for (i = timercnt + HEAP0; i-- > HEAP0; )
3736#if EV_STAT_ENABLE
3737 /*TODO: timer is not always active*/
3738 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3739 {
3740 if (types & EV_STAT)
3741 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3742 }
546 else 3743 else
3744#endif
3745 if (types & EV_TIMER)
3746 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3747
3748#if EV_PERIODIC_ENABLE
3749 if (types & EV_PERIODIC)
3750 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3751 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3752#endif
3753
3754#if EV_IDLE_ENABLE
3755 if (types & EV_IDLE)
3756 for (j = NUMPRI; i--; )
3757 for (i = idlecnt [j]; i--; )
3758 cb (EV_A_ EV_IDLE, idles [j][i]);
3759#endif
3760
3761#if EV_FORK_ENABLE
3762 if (types & EV_FORK)
3763 for (i = forkcnt; i--; )
3764 if (ev_cb (forks [i]) != embed_fork_cb)
3765 cb (EV_A_ EV_FORK, forks [i]);
3766#endif
3767
3768#if EV_ASYNC_ENABLE
3769 if (types & EV_ASYNC)
3770 for (i = asynccnt; i--; )
3771 cb (EV_A_ EV_ASYNC, asyncs [i]);
3772#endif
3773
3774#if EV_PREPARE_ENABLE
3775 if (types & EV_PREPARE)
3776 for (i = preparecnt; i--; )
3777# if EV_EMBED_ENABLE
3778 if (ev_cb (prepares [i]) != embed_prepare_cb)
3779# endif
3780 cb (EV_A_ EV_PREPARE, prepares [i]);
3781#endif
3782
3783#if EV_CHECK_ENABLE
3784 if (types & EV_CHECK)
3785 for (i = checkcnt; i--; )
3786 cb (EV_A_ EV_CHECK, checks [i]);
3787#endif
3788
3789#if EV_SIGNAL_ENABLE
3790 if (types & EV_SIGNAL)
3791 for (i = 0; i < EV_NSIG - 1; ++i)
3792 for (wl = signals [i].head; wl; )
547 { 3793 {
548 block = MAX_BLOCKTIME; 3794 wn = wl->next;
549 3795 cb (EV_A_ EV_SIGNAL, wl);
550 if (timercnt) 3796 wl = wn;
551 {
552 ev_tstamp to = timers [0]->at - get_clock () + method_fudge;
553 if (block > to) block = to;
554 }
555
556 if (periodiccnt)
557 {
558 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
559 if (block > to) block = to;
560 }
561
562 if (block < 0.) block = 0.;
563 } 3797 }
3798#endif
564 3799
565 method_poll (block); 3800#if EV_CHILD_ENABLE
566 3801 if (types & EV_CHILD)
567 /* update ev_now, do magic */ 3802 for (i = (EV_PID_HASHSIZE); i--; )
568 time_update (); 3803 for (wl = childs [i]; wl; )
569
570 /* queue pending timers and reschedule them */
571 periodics_reify (); /* absolute timers first */
572 timers_reify (); /* relative timers second */
573
574 /* queue idle watchers unless io or timers are pending */
575 if (!pendingcnt)
576 queue_events ((W *)idles, idlecnt, EV_IDLE);
577
578 /* queue check and possibly idle watchers */
579 queue_events ((W *)checks, checkcnt, EV_CHECK);
580
581 call_pending ();
582 }
583 while (!ev_loop_done);
584}
585
586/*****************************************************************************/
587
588static void
589wlist_add (WL *head, WL elem)
590{
591 elem->next = *head;
592 *head = elem;
593}
594
595static void
596wlist_del (WL *head, WL elem)
597{
598 while (*head)
599 {
600 if (*head == elem)
601 { 3804 {
602 *head = elem->next; 3805 wn = wl->next;
603 return; 3806 cb (EV_A_ EV_CHILD, wl);
3807 wl = wn;
604 } 3808 }
605
606 head = &(*head)->next;
607 }
608}
609
610static void
611ev_start (W w, int active)
612{
613 w->pending = 0;
614 w->active = active;
615}
616
617static void
618ev_stop (W w)
619{
620 if (w->pending)
621 pendings [w->pending - 1].w = 0;
622
623 w->active = 0;
624}
625
626/*****************************************************************************/
627
628void
629evio_start (struct ev_io *w)
630{
631 if (ev_is_active (w))
632 return;
633
634 int fd = w->fd;
635
636 ev_start ((W)w, 1);
637 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
638 wlist_add ((WL *)&anfds[fd].head, (WL)w);
639
640 ++fdchangecnt;
641 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
642 fdchanges [fdchangecnt - 1] = fd;
643}
644
645void
646evio_stop (struct ev_io *w)
647{
648 if (!ev_is_active (w))
649 return;
650
651 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
652 ev_stop ((W)w);
653
654 ++fdchangecnt;
655 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
656 fdchanges [fdchangecnt - 1] = w->fd;
657}
658
659
660void
661evtimer_start (struct ev_timer *w)
662{
663 if (ev_is_active (w))
664 return;
665
666 w->at += now;
667
668 ev_start ((W)w, ++timercnt);
669 array_needsize (timers, timermax, timercnt, );
670 timers [timercnt - 1] = w;
671 upheap ((WT *)timers, timercnt - 1);
672}
673
674void
675evtimer_stop (struct ev_timer *w)
676{
677 if (!ev_is_active (w))
678 return;
679
680 if (w->active < timercnt--)
681 {
682 timers [w->active - 1] = timers [timercnt];
683 downheap ((WT *)timers, timercnt, w->active - 1);
684 }
685
686 ev_stop ((W)w);
687}
688
689void
690evperiodic_start (struct ev_periodic *w)
691{
692 if (ev_is_active (w))
693 return;
694
695 /* this formula differs from the one in periodic_reify because we do not always round up */
696 if (w->interval)
697 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
698
699 ev_start ((W)w, ++periodiccnt);
700 array_needsize (periodics, periodicmax, periodiccnt, );
701 periodics [periodiccnt - 1] = w;
702 upheap ((WT *)periodics, periodiccnt - 1);
703}
704
705void
706evperiodic_stop (struct ev_periodic *w)
707{
708 if (!ev_is_active (w))
709 return;
710
711 if (w->active < periodiccnt--)
712 {
713 periodics [w->active - 1] = periodics [periodiccnt];
714 downheap ((WT *)periodics, periodiccnt, w->active - 1);
715 }
716
717 ev_stop ((W)w);
718}
719
720void
721evsignal_start (struct ev_signal *w)
722{
723 if (ev_is_active (w))
724 return;
725
726 ev_start ((W)w, 1);
727 array_needsize (signals, signalmax, w->signum, signals_init);
728 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
729
730 if (!w->next)
731 {
732 struct sigaction sa;
733 sa.sa_handler = sighandler;
734 sigfillset (&sa.sa_mask);
735 sa.sa_flags = 0;
736 sigaction (w->signum, &sa, 0);
737 }
738}
739
740void
741evsignal_stop (struct ev_signal *w)
742{
743 if (!ev_is_active (w))
744 return;
745
746 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
747 ev_stop ((W)w);
748
749 if (!signals [w->signum - 1].head)
750 signal (w->signum, SIG_DFL);
751}
752
753void evidle_start (struct ev_idle *w)
754{
755 if (ev_is_active (w))
756 return;
757
758 ev_start ((W)w, ++idlecnt);
759 array_needsize (idles, idlemax, idlecnt, );
760 idles [idlecnt - 1] = w;
761}
762
763void evidle_stop (struct ev_idle *w)
764{
765 idles [w->active - 1] = idles [--idlecnt];
766 ev_stop ((W)w);
767}
768
769void evcheck_start (struct ev_check *w)
770{
771 if (ev_is_active (w))
772 return;
773
774 ev_start ((W)w, ++checkcnt);
775 array_needsize (checks, checkmax, checkcnt, );
776 checks [checkcnt - 1] = w;
777}
778
779void evcheck_stop (struct ev_check *w)
780{
781 checks [w->active - 1] = checks [--checkcnt];
782 ev_stop ((W)w);
783}
784
785/*****************************************************************************/
786
787#if 1
788
789struct ev_io wio;
790
791static void
792sin_cb (struct ev_io *w, int revents)
793{
794 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
795}
796
797static void
798ocb (struct ev_timer *w, int revents)
799{
800 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
801 evtimer_stop (w);
802 evtimer_start (w);
803}
804
805static void
806scb (struct ev_signal *w, int revents)
807{
808 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
809 evio_stop (&wio);
810 evio_start (&wio);
811}
812
813static void
814gcb (struct ev_signal *w, int revents)
815{
816 fprintf (stderr, "generic %x\n", revents);
817
818}
819
820int main (void)
821{
822 ev_init (0);
823
824 evio_init (&wio, sin_cb, 0, EV_READ);
825 evio_start (&wio);
826
827 struct ev_timer t[10000];
828
829#if 0
830 int i;
831 for (i = 0; i < 10000; ++i)
832 {
833 struct ev_timer *w = t + i;
834 evw_init (w, ocb, i);
835 evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
836 evtimer_start (w);
837 if (drand48 () < 0.5)
838 evtimer_stop (w);
839 }
840#endif 3809#endif
841 3810/* EV_STAT 0x00001000 /* stat data changed */
842 struct ev_timer t1; 3811/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
843 evtimer_init (&t1, ocb, 5, 10);
844 evtimer_start (&t1);
845
846 struct ev_signal sig;
847 evsignal_init (&sig, scb, SIGQUIT);
848 evsignal_start (&sig);
849
850 struct ev_check cw;
851 evcheck_init (&cw, gcb);
852 evcheck_start (&cw);
853
854 struct ev_idle iw;
855 evidle_init (&iw, gcb);
856 evidle_start (&iw);
857
858 ev_loop (0);
859
860 return 0;
861} 3812}
862
863#endif 3813#endif
864 3814
3815#if EV_MULTIPLICITY
3816 #include "ev_wrap.h"
3817#endif
865 3818
3819EV_CPP(})
866 3820
867

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