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Comparing libev/ev.c (file contents):
Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs.
Revision 1.369 by root, Sun Jan 23 18:53:06 2011 UTC

1/*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011 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#ifndef HAVE_MONOTONIC 175#include <signal.h>
15# ifdef CLOCK_MONOTONIC 176
16# define HAVE_MONOTONIC 1 177#ifdef EV_H
178# include EV_H
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
17# 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
18#endif 242# endif
243#endif
19 244
20#ifndef HAVE_SELECT 245#ifndef EV_USE_MONOTONIC
21# 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
22#endif 250# endif
251#endif
23 252
24#ifndef HAVE_EPOLL 253#ifndef EV_USE_REALTIME
25# 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
26#endif 262# endif
263#endif
27 264
28#ifndef HAVE_REALTIME 265#ifndef EV_USE_SELECT
29# 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
30#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 */
31 455
32#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) */
33#define MAX_BLOCKTIME 60. 457#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
34 458
35#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)
36 461
37struct ev_watcher { 462#if __GNUC__ >= 4
38 EV_WATCHER (ev_watcher); 463# define expect(expr,value) __builtin_expect ((expr),(value))
39}; 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
40 472
41struct ev_watcher_list { 473#define expect_false(expr) expect ((expr) != 0, 0)
42 EV_WATCHER_LIST (ev_watcher_list); 474#define expect_true(expr) expect ((expr) != 0, 1)
43}; 475#define inline_size static inline
44 476
477#if EV_FEATURE_CODE
478# define inline_speed static inline
479#else
480# define inline_speed static noinline
481#endif
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
45typedef struct ev_watcher *W; 494typedef ev_watcher *W;
46typedef struct ev_watcher_list *WL; 495typedef ev_watcher_list *WL;
496typedef ev_watcher_time *WT;
47 497
48static ev_tstamp now, diff; /* monotonic clock */ 498#define ev_active(w) ((W)(w))->active
49ev_tstamp ev_now; 499#define ev_at(w) ((WT)(w))->at
50int ev_method;
51 500
52static 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
53 506
54static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 507#if EV_USE_MONOTONIC
55static void (*method_modify)(int fd, int oev, int nev); 508static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
56static 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
57 524
58/*****************************************************************************/ 525/*****************************************************************************/
59 526
527#ifdef __linux
528# include <sys/utsname.h>
529#endif
530
531static unsigned int noinline
532ev_linux_version (void)
533{
534#ifdef __linux
535 unsigned int v = 0;
536 struct utsname buf;
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 ev_printerr (msg);
597 ev_printerr (": ");
598 ev_printerr (strerror (errno));
599 ev_printerr ("\n");
600#else
601 perror (msg);
602#endif
603 abort ();
604 }
605}
606
607static void *
608ev_realloc_emul (void *ptr, long size)
609{
610#if __GLIBC__
611 return realloc (ptr, size);
612#else
613 /* some systems, notably openbsd and darwin, fail to properly
614 * implement realloc (x, 0) (as required by both ansi c-89 and
615 * the single unix specification, so work around them here.
616 */
617
618 if (size)
619 return realloc (ptr, size);
620
621 free (ptr);
622 return 0;
623#endif
624}
625
626static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
627
628void
629ev_set_allocator (void *(*cb)(void *ptr, long size))
630{
631 alloc = cb;
632}
633
634inline_speed void *
635ev_realloc (void *ptr, long size)
636{
637 ptr = alloc (ptr, size);
638
639 if (!ptr && size)
640 {
641#if EV_AVOID_STDIO
642 ev_printerr ("(libev) memory allocation failed, aborting.\n");
643#else
644 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
645#endif
646 abort ();
647 }
648
649 return ptr;
650}
651
652#define ev_malloc(size) ev_realloc (0, (size))
653#define ev_free(ptr) ev_realloc ((ptr), 0)
654
655/*****************************************************************************/
656
657/* set in reify when reification needed */
658#define EV_ANFD_REIFY 1
659
660/* file descriptor info structure */
661typedef struct
662{
663 WL head;
664 unsigned char events; /* the events watched for */
665 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
666 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
667 unsigned char unused;
668#if EV_USE_EPOLL
669 unsigned int egen; /* generation counter to counter epoll bugs */
670#endif
671#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
672 SOCKET handle;
673#endif
674#if EV_USE_IOCP
675 OVERLAPPED or, ow;
676#endif
677} ANFD;
678
679/* stores the pending event set for a given watcher */
680typedef struct
681{
682 W w;
683 int events; /* the pending event set for the given watcher */
684} ANPENDING;
685
686#if EV_USE_INOTIFY
687/* hash table entry per inotify-id */
688typedef struct
689{
690 WL head;
691} ANFS;
692#endif
693
694/* Heap Entry */
695#if EV_HEAP_CACHE_AT
696 /* a heap element */
697 typedef struct {
698 ev_tstamp at;
699 WT w;
700 } ANHE;
701
702 #define ANHE_w(he) (he).w /* access watcher, read-write */
703 #define ANHE_at(he) (he).at /* access cached at, read-only */
704 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
705#else
706 /* a heap element */
707 typedef WT ANHE;
708
709 #define ANHE_w(he) (he)
710 #define ANHE_at(he) (he)->at
711 #define ANHE_at_cache(he)
712#endif
713
714#if EV_MULTIPLICITY
715
716 struct ev_loop
717 {
718 ev_tstamp ev_rt_now;
719 #define ev_rt_now ((loop)->ev_rt_now)
720 #define VAR(name,decl) decl;
721 #include "ev_vars.h"
722 #undef VAR
723 };
724 #include "ev_wrap.h"
725
726 static struct ev_loop default_loop_struct;
727 struct ev_loop *ev_default_loop_ptr;
728
729#else
730
731 ev_tstamp ev_rt_now;
732 #define VAR(name,decl) static decl;
733 #include "ev_vars.h"
734 #undef VAR
735
736 static int ev_default_loop_ptr;
737
738#endif
739
740#if EV_FEATURE_API
741# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
742# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
743# define EV_INVOKE_PENDING invoke_cb (EV_A)
744#else
745# define EV_RELEASE_CB (void)0
746# define EV_ACQUIRE_CB (void)0
747# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
748#endif
749
750#define EVBREAK_RECURSE 0x80
751
752/*****************************************************************************/
753
754#ifndef EV_HAVE_EV_TIME
60ev_tstamp 755ev_tstamp
61ev_time (void) 756ev_time (void)
62{ 757{
63#if HAVE_REALTIME 758#if EV_USE_REALTIME
759 if (expect_true (have_realtime))
760 {
64 struct timespec ts; 761 struct timespec ts;
65 clock_gettime (CLOCK_REALTIME, &ts); 762 clock_gettime (CLOCK_REALTIME, &ts);
66 return ts.tv_sec + ts.tv_nsec * 1e-9; 763 return ts.tv_sec + ts.tv_nsec * 1e-9;
67#else 764 }
765#endif
766
68 struct timeval tv; 767 struct timeval tv;
69 gettimeofday (&tv, 0); 768 gettimeofday (&tv, 0);
70 return tv.tv_sec + tv.tv_usec * 1e-6; 769 return tv.tv_sec + tv.tv_usec * 1e-6;
71#endif
72} 770}
771#endif
73 772
74static ev_tstamp 773inline_size ev_tstamp
75get_clock (void) 774get_clock (void)
76{ 775{
77#if HAVE_MONOTONIC 776#if EV_USE_MONOTONIC
78 if (have_monotonic) 777 if (expect_true (have_monotonic))
79 { 778 {
80 struct timespec ts; 779 struct timespec ts;
81 clock_gettime (CLOCK_MONOTONIC, &ts); 780 clock_gettime (CLOCK_MONOTONIC, &ts);
82 return ts.tv_sec + ts.tv_nsec * 1e-9; 781 return ts.tv_sec + ts.tv_nsec * 1e-9;
83 } 782 }
84#endif 783#endif
85 784
86 return ev_time (); 785 return ev_time ();
87} 786}
88 787
89#define array_needsize(base,cur,cnt,init) \ 788#if EV_MULTIPLICITY
90 if ((cnt) > cur) \ 789ev_tstamp
91 { \ 790ev_now (EV_P)
92 int newcnt = cur ? cur << 1 : 16; \ 791{
93 fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ 792 return ev_rt_now;
94 base = realloc (base, sizeof (*base) * (newcnt)); \ 793}
95 init (base + cur, newcnt - cur); \ 794#endif
96 cur = newcnt; \ 795
796void
797ev_sleep (ev_tstamp delay)
798{
799 if (delay > 0.)
97 } 800 {
801#if EV_USE_NANOSLEEP
802 struct timespec ts;
803
804 EV_TS_SET (ts, delay);
805 nanosleep (&ts, 0);
806#elif defined(_WIN32)
807 Sleep ((unsigned long)(delay * 1e3));
808#else
809 struct timeval tv;
810
811 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
812 /* something not guaranteed by newer posix versions, but guaranteed */
813 /* by older ones */
814 EV_TV_SET (tv, delay);
815 select (0, 0, 0, 0, &tv);
816#endif
817 }
818}
819
820inline_speed int
821ev_timeout_to_ms (ev_tstamp timeout)
822{
823 int ms = timeout * 1000. + .999999;
824
825 return expect_true (ms) ? ms : timeout < 1e-6 ? 0 : 1;
826}
98 827
99/*****************************************************************************/ 828/*****************************************************************************/
100 829
101typedef struct 830#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
102{
103 struct ev_io *head;
104 unsigned char wev, rev; /* want, received event set */
105} ANFD;
106 831
107static ANFD *anfds; 832/* find a suitable new size for the given array, */
108static int anfdmax; 833/* hopefully by rounding to a nice-to-malloc size */
109 834inline_size int
110static int *fdchanges; 835array_nextsize (int elem, int cur, int cnt)
111static int fdchangemax, fdchangecnt;
112
113static void
114anfds_init (ANFD *base, int count)
115{ 836{
116 while (count--) 837 int ncur = cur + 1;
117 { 838
118 base->head = 0; 839 do
119 base->wev = base->rev = EV_NONE; 840 ncur <<= 1;
120 ++base; 841 while (cnt > ncur);
842
843 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
844 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
121 } 845 {
122} 846 ncur *= elem;
847 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
848 ncur = ncur - sizeof (void *) * 4;
849 ncur /= elem;
850 }
123 851
124typedef struct 852 return ncur;
125{ 853}
126 W w;
127 int events;
128} ANPENDING;
129 854
130static ANPENDING *pendings; 855static noinline void *
131static int pendingmax, pendingcnt; 856array_realloc (int elem, void *base, int *cur, int cnt)
132
133static void
134event (W w, int events)
135{ 857{
136 w->pending = ++pendingcnt; 858 *cur = array_nextsize (elem, *cur, cnt);
137 array_needsize (pendings, pendingmax, pendingcnt, ); 859 return ev_realloc (base, elem * *cur);
138 pendings [pendingcnt - 1].w = w; 860}
861
862#define array_init_zero(base,count) \
863 memset ((void *)(base), 0, sizeof (*(base)) * (count))
864
865#define array_needsize(type,base,cur,cnt,init) \
866 if (expect_false ((cnt) > (cur))) \
867 { \
868 int ocur_ = (cur); \
869 (base) = (type *)array_realloc \
870 (sizeof (type), (base), &(cur), (cnt)); \
871 init ((base) + (ocur_), (cur) - ocur_); \
872 }
873
874#if 0
875#define array_slim(type,stem) \
876 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
877 { \
878 stem ## max = array_roundsize (stem ## cnt >> 1); \
879 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
880 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
881 }
882#endif
883
884#define array_free(stem, idx) \
885 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
886
887/*****************************************************************************/
888
889/* dummy callback for pending events */
890static void noinline
891pendingcb (EV_P_ ev_prepare *w, int revents)
892{
893}
894
895void noinline
896ev_feed_event (EV_P_ void *w, int revents)
897{
898 W w_ = (W)w;
899 int pri = ABSPRI (w_);
900
901 if (expect_false (w_->pending))
139 pendings [pendingcnt - 1].events = events; 902 pendings [pri][w_->pending - 1].events |= revents;
903 else
904 {
905 w_->pending = ++pendingcnt [pri];
906 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
907 pendings [pri][w_->pending - 1].w = w_;
908 pendings [pri][w_->pending - 1].events = revents;
909 }
140} 910}
141 911
142static void 912inline_speed void
913feed_reverse (EV_P_ W w)
914{
915 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
916 rfeeds [rfeedcnt++] = w;
917}
918
919inline_size void
920feed_reverse_done (EV_P_ int revents)
921{
922 do
923 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
924 while (rfeedcnt);
925}
926
927inline_speed void
928queue_events (EV_P_ W *events, int eventcnt, int type)
929{
930 int i;
931
932 for (i = 0; i < eventcnt; ++i)
933 ev_feed_event (EV_A_ events [i], type);
934}
935
936/*****************************************************************************/
937
938inline_speed void
143fd_event (int fd, int events) 939fd_event_nocheck (EV_P_ int fd, int revents)
144{ 940{
145 ANFD *anfd = anfds + fd; 941 ANFD *anfd = anfds + fd;
146 struct ev_io *w; 942 ev_io *w;
147 943
148 for (w = anfd->head; w; w = w->next) 944 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
149 { 945 {
150 int ev = w->events & events; 946 int ev = w->events & revents;
151 947
152 if (ev) 948 if (ev)
153 event ((W)w, ev); 949 ev_feed_event (EV_A_ (W)w, ev);
154 }
155}
156
157static void
158queue_events (W *events, int eventcnt, int type)
159{
160 int i;
161
162 for (i = 0; i < eventcnt; ++i)
163 event (events [i], type);
164}
165
166/*****************************************************************************/
167
168static struct ev_timer **atimers;
169static int atimermax, atimercnt;
170
171static struct ev_timer **rtimers;
172static int rtimermax, rtimercnt;
173
174static void
175upheap (struct ev_timer **timers, int k)
176{
177 struct ev_timer *w = timers [k];
178
179 while (k && timers [k >> 1]->at > w->at)
180 {
181 timers [k] = timers [k >> 1];
182 timers [k]->active = k + 1;
183 k >>= 1;
184 }
185
186 timers [k] = w;
187 timers [k]->active = k + 1;
188
189}
190
191static void
192downheap (struct ev_timer **timers, int N, int k)
193{
194 struct ev_timer *w = timers [k];
195
196 while (k < (N >> 1))
197 {
198 int j = k << 1;
199
200 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
201 ++j;
202
203 if (w->at <= timers [j]->at)
204 break;
205
206 timers [k] = timers [j];
207 timers [k]->active = k + 1;
208 k = j;
209 }
210
211 timers [k] = w;
212 timers [k]->active = k + 1;
213}
214
215/*****************************************************************************/
216
217typedef struct
218{
219 struct ev_signal *head;
220 sig_atomic_t gotsig;
221} ANSIG;
222
223static ANSIG *signals;
224static int signalmax;
225
226static int sigpipe [2];
227static sig_atomic_t gotsig;
228static struct ev_io sigev;
229
230static void
231signals_init (ANSIG *base, int count)
232{
233 while (count--)
234 {
235 base->head = 0;
236 base->gotsig = 0;
237 ++base;
238 }
239}
240
241static void
242sighandler (int signum)
243{
244 signals [signum - 1].gotsig = 1;
245
246 if (!gotsig)
247 {
248 gotsig = 1;
249 write (sigpipe [1], &gotsig, 1);
250 }
251}
252
253static void
254sigcb (struct ev_io *iow, int revents)
255{
256 struct ev_signal *w;
257 int sig;
258
259 gotsig = 0;
260 read (sigpipe [0], &revents, 1);
261
262 for (sig = signalmax; sig--; )
263 if (signals [sig].gotsig)
264 {
265 signals [sig].gotsig = 0;
266
267 for (w = signals [sig].head; w; w = w->next)
268 event ((W)w, EV_SIGNAL);
269 } 950 }
270} 951}
271 952
272static void 953/* do not submit kernel events for fds that have reify set */
273siginit (void) 954/* because that means they changed while we were polling for new events */
955inline_speed void
956fd_event (EV_P_ int fd, int revents)
274{ 957{
275 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); 958 ANFD *anfd = anfds + fd;
276 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277 959
278 /* rather than sort out wether we really need nb, set it */ 960 if (expect_true (!anfd->reify))
279 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 961 fd_event_nocheck (EV_A_ fd, revents);
280 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
281
282 evio_set (&sigev, sigpipe [0], EV_READ);
283 evio_start (&sigev);
284} 962}
285 963
286/*****************************************************************************/ 964void
287 965ev_feed_fd_event (EV_P_ int fd, int revents)
288static struct ev_idle **idles;
289static int idlemax, idlecnt;
290
291static struct ev_check **checks;
292static int checkmax, checkcnt;
293
294/*****************************************************************************/
295
296#if HAVE_EPOLL
297# include "ev_epoll.c"
298#endif
299#if HAVE_SELECT
300# include "ev_select.c"
301#endif
302
303int ev_init (int flags)
304{ 966{
305#if HAVE_MONOTONIC 967 if (fd >= 0 && fd < anfdmax)
306 { 968 fd_event_nocheck (EV_A_ fd, revents);
307 struct timespec ts;
308 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309 have_monotonic = 1;
310 }
311#endif
312
313 ev_now = ev_time ();
314 now = get_clock ();
315 diff = ev_now - now;
316
317 if (pipe (sigpipe))
318 return 0;
319
320 ev_method = EVMETHOD_NONE;
321#if HAVE_EPOLL
322 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
323#endif
324#if HAVE_SELECT
325 if (ev_method == EVMETHOD_NONE) select_init (flags);
326#endif
327
328 if (ev_method)
329 {
330 evw_init (&sigev, sigcb, 0);
331 siginit ();
332 }
333
334 return ev_method;
335} 969}
336 970
337/*****************************************************************************/ 971/* make sure the external fd watch events are in-sync */
338 972/* with the kernel/libev internal state */
339void ev_prefork (void) 973inline_size void
340{ 974fd_reify (EV_P)
341}
342
343void ev_postfork_parent (void)
344{
345}
346
347void ev_postfork_child (void)
348{
349#if HAVE_EPOLL
350 if (ev_method == EVMETHOD_EPOLL)
351 epoll_postfork_child ();
352#endif
353
354 evio_stop (&sigev);
355 close (sigpipe [0]);
356 close (sigpipe [1]);
357 pipe (sigpipe);
358 siginit ();
359}
360
361/*****************************************************************************/
362
363static void
364fd_reify (void)
365{ 975{
366 int i; 976 int i;
367 977
368 for (i = 0; i < fdchangecnt; ++i) 978 for (i = 0; i < fdchangecnt; ++i)
369 { 979 {
370 int fd = fdchanges [i]; 980 int fd = fdchanges [i];
371 ANFD *anfd = anfds + fd; 981 ANFD *anfd = anfds + fd;
372 struct ev_io *w; 982 ev_io *w;
373 983
374 int wev = 0; 984 unsigned char o_events = anfd->events;
985 unsigned char o_reify = anfd->reify;
375 986
376 for (w = anfd->head; w; w = w->next) 987 anfd->reify = 0;
377 wev |= w->events;
378 988
379 if (anfd->wev != wev) 989#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
990 if (o_reify & EV__IOFDSET)
380 { 991 {
381 method_modify (fd, anfd->wev, wev); 992 unsigned long arg;
382 anfd->wev = wev; 993 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
994 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
995 printf ("oi %d %x\n", fd, anfd->handle);//D
383 } 996 }
997#endif
998
999 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1000 {
1001 anfd->events = 0;
1002
1003 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1004 anfd->events |= (unsigned char)w->events;
1005
1006 if (o_events != anfd->events)
1007 o_reify = EV__IOFDSET; /* actually |= */
1008 }
1009
1010 if (o_reify & EV__IOFDSET)
1011 backend_modify (EV_A_ fd, o_events, anfd->events);
384 } 1012 }
385 1013
386 fdchangecnt = 0; 1014 fdchangecnt = 0;
387} 1015}
388 1016
1017/* something about the given fd changed */
1018inline_size void
1019fd_change (EV_P_ int fd, int flags)
1020{
1021 unsigned char reify = anfds [fd].reify;
1022 anfds [fd].reify |= flags;
1023
1024 if (expect_true (!reify))
1025 {
1026 ++fdchangecnt;
1027 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1028 fdchanges [fdchangecnt - 1] = fd;
1029 }
1030}
1031
1032/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1033inline_speed void
1034fd_kill (EV_P_ int fd)
1035{
1036 ev_io *w;
1037
1038 while ((w = (ev_io *)anfds [fd].head))
1039 {
1040 ev_io_stop (EV_A_ w);
1041 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1042 }
1043}
1044
1045/* check whether the given fd is actually valid, for error recovery */
1046inline_size int
1047fd_valid (int fd)
1048{
1049#ifdef _WIN32
1050 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1051#else
1052 return fcntl (fd, F_GETFD) != -1;
1053#endif
1054}
1055
1056/* called on EBADF to verify fds */
1057static void noinline
1058fd_ebadf (EV_P)
1059{
1060 int fd;
1061
1062 for (fd = 0; fd < anfdmax; ++fd)
1063 if (anfds [fd].events)
1064 if (!fd_valid (fd) && errno == EBADF)
1065 fd_kill (EV_A_ fd);
1066}
1067
1068/* called on ENOMEM in select/poll to kill some fds and retry */
1069static void noinline
1070fd_enomem (EV_P)
1071{
1072 int fd;
1073
1074 for (fd = anfdmax; fd--; )
1075 if (anfds [fd].events)
1076 {
1077 fd_kill (EV_A_ fd);
1078 break;
1079 }
1080}
1081
1082/* usually called after fork if backend needs to re-arm all fds from scratch */
1083static void noinline
1084fd_rearm_all (EV_P)
1085{
1086 int fd;
1087
1088 for (fd = 0; fd < anfdmax; ++fd)
1089 if (anfds [fd].events)
1090 {
1091 anfds [fd].events = 0;
1092 anfds [fd].emask = 0;
1093 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1094 }
1095}
1096
1097/* used to prepare libev internal fd's */
1098/* this is not fork-safe */
1099inline_speed void
1100fd_intern (int fd)
1101{
1102#ifdef _WIN32
1103 unsigned long arg = 1;
1104 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1105#else
1106 fcntl (fd, F_SETFD, FD_CLOEXEC);
1107 fcntl (fd, F_SETFL, O_NONBLOCK);
1108#endif
1109}
1110
1111/*****************************************************************************/
1112
1113/*
1114 * the heap functions want a real array index. array index 0 is guaranteed to not
1115 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1116 * the branching factor of the d-tree.
1117 */
1118
1119/*
1120 * at the moment we allow libev the luxury of two heaps,
1121 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1122 * which is more cache-efficient.
1123 * the difference is about 5% with 50000+ watchers.
1124 */
1125#if EV_USE_4HEAP
1126
1127#define DHEAP 4
1128#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1129#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1130#define UPHEAP_DONE(p,k) ((p) == (k))
1131
1132/* away from the root */
1133inline_speed void
1134downheap (ANHE *heap, int N, int k)
1135{
1136 ANHE he = heap [k];
1137 ANHE *E = heap + N + HEAP0;
1138
1139 for (;;)
1140 {
1141 ev_tstamp minat;
1142 ANHE *minpos;
1143 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1144
1145 /* find minimum child */
1146 if (expect_true (pos + DHEAP - 1 < E))
1147 {
1148 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1149 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1150 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1151 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1152 }
1153 else if (pos < E)
1154 {
1155 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1156 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1157 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1158 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1159 }
1160 else
1161 break;
1162
1163 if (ANHE_at (he) <= minat)
1164 break;
1165
1166 heap [k] = *minpos;
1167 ev_active (ANHE_w (*minpos)) = k;
1168
1169 k = minpos - heap;
1170 }
1171
1172 heap [k] = he;
1173 ev_active (ANHE_w (he)) = k;
1174}
1175
1176#else /* 4HEAP */
1177
1178#define HEAP0 1
1179#define HPARENT(k) ((k) >> 1)
1180#define UPHEAP_DONE(p,k) (!(p))
1181
1182/* away from the root */
1183inline_speed void
1184downheap (ANHE *heap, int N, int k)
1185{
1186 ANHE he = heap [k];
1187
1188 for (;;)
1189 {
1190 int c = k << 1;
1191
1192 if (c >= N + HEAP0)
1193 break;
1194
1195 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1196 ? 1 : 0;
1197
1198 if (ANHE_at (he) <= ANHE_at (heap [c]))
1199 break;
1200
1201 heap [k] = heap [c];
1202 ev_active (ANHE_w (heap [k])) = k;
1203
1204 k = c;
1205 }
1206
1207 heap [k] = he;
1208 ev_active (ANHE_w (he)) = k;
1209}
1210#endif
1211
1212/* towards the root */
1213inline_speed void
1214upheap (ANHE *heap, int k)
1215{
1216 ANHE he = heap [k];
1217
1218 for (;;)
1219 {
1220 int p = HPARENT (k);
1221
1222 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1223 break;
1224
1225 heap [k] = heap [p];
1226 ev_active (ANHE_w (heap [k])) = k;
1227 k = p;
1228 }
1229
1230 heap [k] = he;
1231 ev_active (ANHE_w (he)) = k;
1232}
1233
1234/* move an element suitably so it is in a correct place */
1235inline_size void
1236adjustheap (ANHE *heap, int N, int k)
1237{
1238 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1239 upheap (heap, k);
1240 else
1241 downheap (heap, N, k);
1242}
1243
1244/* rebuild the heap: this function is used only once and executed rarely */
1245inline_size void
1246reheap (ANHE *heap, int N)
1247{
1248 int i;
1249
1250 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1251 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1252 for (i = 0; i < N; ++i)
1253 upheap (heap, i + HEAP0);
1254}
1255
1256/*****************************************************************************/
1257
1258/* associate signal watchers to a signal signal */
1259typedef struct
1260{
1261 EV_ATOMIC_T pending;
1262#if EV_MULTIPLICITY
1263 EV_P;
1264#endif
1265 WL head;
1266} ANSIG;
1267
1268static ANSIG signals [EV_NSIG - 1];
1269
1270/*****************************************************************************/
1271
1272#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1273
1274static void noinline
1275evpipe_init (EV_P)
1276{
1277 if (!ev_is_active (&pipe_w))
1278 {
1279# if EV_USE_EVENTFD
1280 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1281 if (evfd < 0 && errno == EINVAL)
1282 evfd = eventfd (0, 0);
1283
1284 if (evfd >= 0)
1285 {
1286 evpipe [0] = -1;
1287 fd_intern (evfd); /* doing it twice doesn't hurt */
1288 ev_io_set (&pipe_w, evfd, EV_READ);
1289 }
1290 else
1291# endif
1292 {
1293 while (pipe (evpipe))
1294 ev_syserr ("(libev) error creating signal/async pipe");
1295
1296 fd_intern (evpipe [0]);
1297 fd_intern (evpipe [1]);
1298 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1299 }
1300
1301 ev_io_start (EV_A_ &pipe_w);
1302 ev_unref (EV_A); /* watcher should not keep loop alive */
1303 }
1304}
1305
1306inline_size void
1307evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1308{
1309 if (!*flag)
1310 {
1311 int old_errno = errno; /* save errno because write might clobber it */
1312 char dummy;
1313
1314 *flag = 1;
1315
1316#if EV_USE_EVENTFD
1317 if (evfd >= 0)
1318 {
1319 uint64_t counter = 1;
1320 write (evfd, &counter, sizeof (uint64_t));
1321 }
1322 else
1323#endif
1324 /* win32 people keep sending patches that change this write() to send() */
1325 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1326 /* so when you think this write should be a send instead, please find out */
1327 /* where your send() is from - it's definitely not the microsoft send, and */
1328 /* tell me. thank you. */
1329 write (evpipe [1], &dummy, 1);
1330
1331 errno = old_errno;
1332 }
1333}
1334
1335/* called whenever the libev signal pipe */
1336/* got some events (signal, async) */
389static void 1337static void
390call_pending () 1338pipecb (EV_P_ ev_io *iow, int revents)
391{ 1339{
392 int i; 1340 int i;
393 1341
394 for (i = 0; i < pendingcnt; ++i) 1342#if EV_USE_EVENTFD
1343 if (evfd >= 0)
1344 {
1345 uint64_t counter;
1346 read (evfd, &counter, sizeof (uint64_t));
395 { 1347 }
396 ANPENDING *p = pendings + i; 1348 else
1349#endif
1350 {
1351 char dummy;
1352 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1353 read (evpipe [0], &dummy, 1);
1354 }
397 1355
398 if (p->w) 1356#if EV_SIGNAL_ENABLE
1357 if (sig_pending)
1358 {
1359 sig_pending = 0;
1360
1361 for (i = EV_NSIG - 1; i--; )
1362 if (expect_false (signals [i].pending))
1363 ev_feed_signal_event (EV_A_ i + 1);
1364 }
1365#endif
1366
1367#if EV_ASYNC_ENABLE
1368 if (async_pending)
1369 {
1370 async_pending = 0;
1371
1372 for (i = asynccnt; i--; )
1373 if (asyncs [i]->sent)
1374 {
1375 asyncs [i]->sent = 0;
1376 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1377 }
1378 }
1379#endif
1380}
1381
1382/*****************************************************************************/
1383
1384void
1385ev_feed_signal (int signum)
1386{
1387#if EV_MULTIPLICITY
1388 EV_P = signals [signum - 1].loop;
1389
1390 if (!EV_A)
1391 return;
1392#endif
1393
1394 signals [signum - 1].pending = 1;
1395 evpipe_write (EV_A_ &sig_pending);
1396}
1397
1398static void
1399ev_sighandler (int signum)
1400{
1401#ifdef _WIN32
1402 signal (signum, ev_sighandler);
1403#endif
1404
1405 ev_feed_signal (signum);
1406}
1407
1408void noinline
1409ev_feed_signal_event (EV_P_ int signum)
1410{
1411 WL w;
1412
1413 if (expect_false (signum <= 0 || signum > EV_NSIG))
1414 return;
1415
1416 --signum;
1417
1418#if EV_MULTIPLICITY
1419 /* it is permissible to try to feed a signal to the wrong loop */
1420 /* or, likely more useful, feeding a signal nobody is waiting for */
1421
1422 if (expect_false (signals [signum].loop != EV_A))
1423 return;
1424#endif
1425
1426 signals [signum].pending = 0;
1427
1428 for (w = signals [signum].head; w; w = w->next)
1429 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1430}
1431
1432#if EV_USE_SIGNALFD
1433static void
1434sigfdcb (EV_P_ ev_io *iow, int revents)
1435{
1436 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1437
1438 for (;;)
1439 {
1440 ssize_t res = read (sigfd, si, sizeof (si));
1441
1442 /* not ISO-C, as res might be -1, but works with SuS */
1443 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1444 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1445
1446 if (res < (ssize_t)sizeof (si))
1447 break;
1448 }
1449}
1450#endif
1451
1452#endif
1453
1454/*****************************************************************************/
1455
1456#if EV_CHILD_ENABLE
1457static WL childs [EV_PID_HASHSIZE];
1458
1459static ev_signal childev;
1460
1461#ifndef WIFCONTINUED
1462# define WIFCONTINUED(status) 0
1463#endif
1464
1465/* handle a single child status event */
1466inline_speed void
1467child_reap (EV_P_ int chain, int pid, int status)
1468{
1469 ev_child *w;
1470 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1471
1472 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1473 {
1474 if ((w->pid == pid || !w->pid)
1475 && (!traced || (w->flags & 1)))
399 { 1476 {
400 p->w->pending = 0; 1477 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
401 p->w->cb (p->w, p->events); 1478 w->rpid = pid;
1479 w->rstatus = status;
1480 ev_feed_event (EV_A_ (W)w, EV_CHILD);
402 } 1481 }
403 } 1482 }
404
405 pendingcnt = 0;
406} 1483}
407 1484
1485#ifndef WCONTINUED
1486# define WCONTINUED 0
1487#endif
1488
1489/* called on sigchld etc., calls waitpid */
408static void 1490static void
409timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now) 1491childcb (EV_P_ ev_signal *sw, int revents)
410{ 1492{
411 while (timercnt && timers [0]->at <= now) 1493 int pid, status;
1494
1495 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1496 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1497 if (!WCONTINUED
1498 || errno != EINVAL
1499 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1500 return;
1501
1502 /* make sure we are called again until all children have been reaped */
1503 /* we need to do it this way so that the callback gets called before we continue */
1504 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1505
1506 child_reap (EV_A_ pid, pid, status);
1507 if ((EV_PID_HASHSIZE) > 1)
1508 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1509}
1510
1511#endif
1512
1513/*****************************************************************************/
1514
1515#if EV_USE_IOCP
1516# include "ev_iocp.c"
1517#endif
1518#if EV_USE_PORT
1519# include "ev_port.c"
1520#endif
1521#if EV_USE_KQUEUE
1522# include "ev_kqueue.c"
1523#endif
1524#if EV_USE_EPOLL
1525# include "ev_epoll.c"
1526#endif
1527#if EV_USE_POLL
1528# include "ev_poll.c"
1529#endif
1530#if EV_USE_SELECT
1531# include "ev_select.c"
1532#endif
1533
1534int
1535ev_version_major (void)
1536{
1537 return EV_VERSION_MAJOR;
1538}
1539
1540int
1541ev_version_minor (void)
1542{
1543 return EV_VERSION_MINOR;
1544}
1545
1546/* return true if we are running with elevated privileges and should ignore env variables */
1547int inline_size
1548enable_secure (void)
1549{
1550#ifdef _WIN32
1551 return 0;
1552#else
1553 return getuid () != geteuid ()
1554 || getgid () != getegid ();
1555#endif
1556}
1557
1558unsigned int
1559ev_supported_backends (void)
1560{
1561 unsigned int flags = 0;
1562
1563 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1564 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1565 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1566 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1567 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1568
1569 return flags;
1570}
1571
1572unsigned int
1573ev_recommended_backends (void)
1574{
1575 unsigned int flags = ev_supported_backends ();
1576
1577#ifndef __NetBSD__
1578 /* kqueue is borked on everything but netbsd apparently */
1579 /* it usually doesn't work correctly on anything but sockets and pipes */
1580 flags &= ~EVBACKEND_KQUEUE;
1581#endif
1582#ifdef __APPLE__
1583 /* only select works correctly on that "unix-certified" platform */
1584 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1585 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1586#endif
1587#ifdef __FreeBSD__
1588 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1589#endif
1590
1591 return flags;
1592}
1593
1594unsigned int
1595ev_embeddable_backends (void)
1596{
1597 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1598
1599 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1600 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1601 flags &= ~EVBACKEND_EPOLL;
1602
1603 return flags;
1604}
1605
1606unsigned int
1607ev_backend (EV_P)
1608{
1609 return backend;
1610}
1611
1612#if EV_FEATURE_API
1613unsigned int
1614ev_iteration (EV_P)
1615{
1616 return loop_count;
1617}
1618
1619unsigned int
1620ev_depth (EV_P)
1621{
1622 return loop_depth;
1623}
1624
1625void
1626ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1627{
1628 io_blocktime = interval;
1629}
1630
1631void
1632ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1633{
1634 timeout_blocktime = interval;
1635}
1636
1637void
1638ev_set_userdata (EV_P_ void *data)
1639{
1640 userdata = data;
1641}
1642
1643void *
1644ev_userdata (EV_P)
1645{
1646 return userdata;
1647}
1648
1649void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1650{
1651 invoke_cb = invoke_pending_cb;
1652}
1653
1654void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1655{
1656 release_cb = release;
1657 acquire_cb = acquire;
1658}
1659#endif
1660
1661/* initialise a loop structure, must be zero-initialised */
1662static void noinline
1663loop_init (EV_P_ unsigned int flags)
1664{
1665 if (!backend)
1666 {
1667 origflags = flags;
1668
1669#if EV_USE_REALTIME
1670 if (!have_realtime)
1671 {
1672 struct timespec ts;
1673
1674 if (!clock_gettime (CLOCK_REALTIME, &ts))
1675 have_realtime = 1;
1676 }
1677#endif
1678
1679#if EV_USE_MONOTONIC
1680 if (!have_monotonic)
1681 {
1682 struct timespec ts;
1683
1684 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1685 have_monotonic = 1;
1686 }
1687#endif
1688
1689 /* pid check not overridable via env */
1690#ifndef _WIN32
1691 if (flags & EVFLAG_FORKCHECK)
1692 curpid = getpid ();
1693#endif
1694
1695 if (!(flags & EVFLAG_NOENV)
1696 && !enable_secure ()
1697 && getenv ("LIBEV_FLAGS"))
1698 flags = atoi (getenv ("LIBEV_FLAGS"));
1699
1700 ev_rt_now = ev_time ();
1701 mn_now = get_clock ();
1702 now_floor = mn_now;
1703 rtmn_diff = ev_rt_now - mn_now;
1704#if EV_FEATURE_API
1705 invoke_cb = ev_invoke_pending;
1706#endif
1707
1708 io_blocktime = 0.;
1709 timeout_blocktime = 0.;
1710 backend = 0;
1711 backend_fd = -1;
1712 sig_pending = 0;
1713#if EV_ASYNC_ENABLE
1714 async_pending = 0;
1715#endif
1716#if EV_USE_INOTIFY
1717 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1718#endif
1719#if EV_USE_SIGNALFD
1720 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1721#endif
1722
1723 if (!(flags & EVBACKEND_MASK))
1724 flags |= ev_recommended_backends ();
1725
1726#if EV_USE_IOCP
1727 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1728#endif
1729#if EV_USE_PORT
1730 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1731#endif
1732#if EV_USE_KQUEUE
1733 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1734#endif
1735#if EV_USE_EPOLL
1736 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1737#endif
1738#if EV_USE_POLL
1739 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1740#endif
1741#if EV_USE_SELECT
1742 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1743#endif
1744
1745 ev_prepare_init (&pending_w, pendingcb);
1746
1747#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1748 ev_init (&pipe_w, pipecb);
1749 ev_set_priority (&pipe_w, EV_MAXPRI);
1750#endif
1751 }
1752}
1753
1754/* free up a loop structure */
1755void
1756ev_loop_destroy (EV_P)
1757{
1758 int i;
1759
1760#if EV_MULTIPLICITY
1761 /* mimic free (0) */
1762 if (!EV_A)
1763 return;
1764#endif
1765
1766#if EV_CLEANUP_ENABLE
1767 /* queue cleanup watchers (and execute them) */
1768 if (expect_false (cleanupcnt))
1769 {
1770 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1771 EV_INVOKE_PENDING;
1772 }
1773#endif
1774
1775#if EV_CHILD_ENABLE
1776 if (ev_is_active (&childev))
1777 {
1778 ev_ref (EV_A); /* child watcher */
1779 ev_signal_stop (EV_A_ &childev);
1780 }
1781#endif
1782
1783 if (ev_is_active (&pipe_w))
1784 {
1785 /*ev_ref (EV_A);*/
1786 /*ev_io_stop (EV_A_ &pipe_w);*/
1787
1788#if EV_USE_EVENTFD
1789 if (evfd >= 0)
1790 close (evfd);
1791#endif
1792
1793 if (evpipe [0] >= 0)
1794 {
1795 EV_WIN32_CLOSE_FD (evpipe [0]);
1796 EV_WIN32_CLOSE_FD (evpipe [1]);
1797 }
1798 }
1799
1800#if EV_USE_SIGNALFD
1801 if (ev_is_active (&sigfd_w))
1802 close (sigfd);
1803#endif
1804
1805#if EV_USE_INOTIFY
1806 if (fs_fd >= 0)
1807 close (fs_fd);
1808#endif
1809
1810 if (backend_fd >= 0)
1811 close (backend_fd);
1812
1813#if EV_USE_IOCP
1814 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1815#endif
1816#if EV_USE_PORT
1817 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1818#endif
1819#if EV_USE_KQUEUE
1820 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1821#endif
1822#if EV_USE_EPOLL
1823 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1824#endif
1825#if EV_USE_POLL
1826 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1827#endif
1828#if EV_USE_SELECT
1829 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1830#endif
1831
1832 for (i = NUMPRI; i--; )
1833 {
1834 array_free (pending, [i]);
1835#if EV_IDLE_ENABLE
1836 array_free (idle, [i]);
1837#endif
1838 }
1839
1840 ev_free (anfds); anfds = 0; anfdmax = 0;
1841
1842 /* have to use the microsoft-never-gets-it-right macro */
1843 array_free (rfeed, EMPTY);
1844 array_free (fdchange, EMPTY);
1845 array_free (timer, EMPTY);
1846#if EV_PERIODIC_ENABLE
1847 array_free (periodic, EMPTY);
1848#endif
1849#if EV_FORK_ENABLE
1850 array_free (fork, EMPTY);
1851#endif
1852#if EV_CLEANUP_ENABLE
1853 array_free (cleanup, EMPTY);
1854#endif
1855 array_free (prepare, EMPTY);
1856 array_free (check, EMPTY);
1857#if EV_ASYNC_ENABLE
1858 array_free (async, EMPTY);
1859#endif
1860
1861 backend = 0;
1862
1863#if EV_MULTIPLICITY
1864 if (ev_is_default_loop (EV_A))
1865#endif
1866 ev_default_loop_ptr = 0;
1867#if EV_MULTIPLICITY
1868 else
1869 ev_free (EV_A);
1870#endif
1871}
1872
1873#if EV_USE_INOTIFY
1874inline_size void infy_fork (EV_P);
1875#endif
1876
1877inline_size void
1878loop_fork (EV_P)
1879{
1880#if EV_USE_PORT
1881 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1882#endif
1883#if EV_USE_KQUEUE
1884 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1885#endif
1886#if EV_USE_EPOLL
1887 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1888#endif
1889#if EV_USE_INOTIFY
1890 infy_fork (EV_A);
1891#endif
1892
1893 if (ev_is_active (&pipe_w))
1894 {
1895 /* this "locks" the handlers against writing to the pipe */
1896 /* while we modify the fd vars */
1897 sig_pending = 1;
1898#if EV_ASYNC_ENABLE
1899 async_pending = 1;
1900#endif
1901
1902 ev_ref (EV_A);
1903 ev_io_stop (EV_A_ &pipe_w);
1904
1905#if EV_USE_EVENTFD
1906 if (evfd >= 0)
1907 close (evfd);
1908#endif
1909
1910 if (evpipe [0] >= 0)
1911 {
1912 EV_WIN32_CLOSE_FD (evpipe [0]);
1913 EV_WIN32_CLOSE_FD (evpipe [1]);
1914 }
1915
1916#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1917 evpipe_init (EV_A);
1918 /* now iterate over everything, in case we missed something */
1919 pipecb (EV_A_ &pipe_w, EV_READ);
1920#endif
1921 }
1922
1923 postfork = 0;
1924}
1925
1926#if EV_MULTIPLICITY
1927
1928struct ev_loop *
1929ev_loop_new (unsigned int flags)
1930{
1931 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1932
1933 memset (EV_A, 0, sizeof (struct ev_loop));
1934 loop_init (EV_A_ flags);
1935
1936 if (ev_backend (EV_A))
1937 return EV_A;
1938
1939 ev_free (EV_A);
1940 return 0;
1941}
1942
1943#endif /* multiplicity */
1944
1945#if EV_VERIFY
1946static void noinline
1947verify_watcher (EV_P_ W w)
1948{
1949 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1950
1951 if (w->pending)
1952 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1953}
1954
1955static void noinline
1956verify_heap (EV_P_ ANHE *heap, int N)
1957{
1958 int i;
1959
1960 for (i = HEAP0; i < N + HEAP0; ++i)
1961 {
1962 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1963 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1964 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1965
1966 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1967 }
1968}
1969
1970static void noinline
1971array_verify (EV_P_ W *ws, int cnt)
1972{
1973 while (cnt--)
1974 {
1975 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1976 verify_watcher (EV_A_ ws [cnt]);
1977 }
1978}
1979#endif
1980
1981#if EV_FEATURE_API
1982void
1983ev_verify (EV_P)
1984{
1985#if EV_VERIFY
1986 int i;
1987 WL w;
1988
1989 assert (activecnt >= -1);
1990
1991 assert (fdchangemax >= fdchangecnt);
1992 for (i = 0; i < fdchangecnt; ++i)
1993 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1994
1995 assert (anfdmax >= 0);
1996 for (i = 0; i < anfdmax; ++i)
1997 for (w = anfds [i].head; w; w = w->next)
412 { 1998 {
413 struct ev_timer *w = timers [0]; 1999 verify_watcher (EV_A_ (W)w);
2000 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2001 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2002 }
414 2003
2004 assert (timermax >= timercnt);
2005 verify_heap (EV_A_ timers, timercnt);
2006
2007#if EV_PERIODIC_ENABLE
2008 assert (periodicmax >= periodiccnt);
2009 verify_heap (EV_A_ periodics, periodiccnt);
2010#endif
2011
2012 for (i = NUMPRI; i--; )
2013 {
2014 assert (pendingmax [i] >= pendingcnt [i]);
2015#if EV_IDLE_ENABLE
2016 assert (idleall >= 0);
2017 assert (idlemax [i] >= idlecnt [i]);
2018 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2019#endif
2020 }
2021
2022#if EV_FORK_ENABLE
2023 assert (forkmax >= forkcnt);
2024 array_verify (EV_A_ (W *)forks, forkcnt);
2025#endif
2026
2027#if EV_CLEANUP_ENABLE
2028 assert (cleanupmax >= cleanupcnt);
2029 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2030#endif
2031
2032#if EV_ASYNC_ENABLE
2033 assert (asyncmax >= asynccnt);
2034 array_verify (EV_A_ (W *)asyncs, asynccnt);
2035#endif
2036
2037#if EV_PREPARE_ENABLE
2038 assert (preparemax >= preparecnt);
2039 array_verify (EV_A_ (W *)prepares, preparecnt);
2040#endif
2041
2042#if EV_CHECK_ENABLE
2043 assert (checkmax >= checkcnt);
2044 array_verify (EV_A_ (W *)checks, checkcnt);
2045#endif
2046
2047# if 0
2048#if EV_CHILD_ENABLE
2049 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2050 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2051#endif
2052# endif
2053#endif
2054}
2055#endif
2056
2057#if EV_MULTIPLICITY
2058struct ev_loop *
2059#else
2060int
2061#endif
2062ev_default_loop (unsigned int flags)
2063{
2064 if (!ev_default_loop_ptr)
2065 {
2066#if EV_MULTIPLICITY
2067 EV_P = ev_default_loop_ptr = &default_loop_struct;
2068#else
2069 ev_default_loop_ptr = 1;
2070#endif
2071
2072 loop_init (EV_A_ flags);
2073
2074 if (ev_backend (EV_A))
2075 {
2076#if EV_CHILD_ENABLE
2077 ev_signal_init (&childev, childcb, SIGCHLD);
2078 ev_set_priority (&childev, EV_MAXPRI);
2079 ev_signal_start (EV_A_ &childev);
2080 ev_unref (EV_A); /* child watcher should not keep loop alive */
2081#endif
2082 }
2083 else
2084 ev_default_loop_ptr = 0;
2085 }
2086
2087 return ev_default_loop_ptr;
2088}
2089
2090void
2091ev_loop_fork (EV_P)
2092{
2093 postfork = 1; /* must be in line with ev_default_fork */
2094}
2095
2096/*****************************************************************************/
2097
2098void
2099ev_invoke (EV_P_ void *w, int revents)
2100{
2101 EV_CB_INVOKE ((W)w, revents);
2102}
2103
2104unsigned int
2105ev_pending_count (EV_P)
2106{
2107 int pri;
2108 unsigned int count = 0;
2109
2110 for (pri = NUMPRI; pri--; )
2111 count += pendingcnt [pri];
2112
2113 return count;
2114}
2115
2116void noinline
2117ev_invoke_pending (EV_P)
2118{
2119 int pri;
2120
2121 for (pri = NUMPRI; pri--; )
2122 while (pendingcnt [pri])
2123 {
2124 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2125
2126 p->w->pending = 0;
2127 EV_CB_INVOKE (p->w, p->events);
2128 EV_FREQUENT_CHECK;
2129 }
2130}
2131
2132#if EV_IDLE_ENABLE
2133/* make idle watchers pending. this handles the "call-idle */
2134/* only when higher priorities are idle" logic */
2135inline_size void
2136idle_reify (EV_P)
2137{
2138 if (expect_false (idleall))
2139 {
2140 int pri;
2141
2142 for (pri = NUMPRI; pri--; )
2143 {
2144 if (pendingcnt [pri])
2145 break;
2146
2147 if (idlecnt [pri])
2148 {
2149 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2150 break;
2151 }
2152 }
2153 }
2154}
2155#endif
2156
2157/* make timers pending */
2158inline_size void
2159timers_reify (EV_P)
2160{
2161 EV_FREQUENT_CHECK;
2162
2163 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2164 {
2165 do
2166 {
2167 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2168
2169 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2170
415 /* first reschedule or stop timer */ 2171 /* first reschedule or stop timer */
2172 if (w->repeat)
2173 {
2174 ev_at (w) += w->repeat;
2175 if (ev_at (w) < mn_now)
2176 ev_at (w) = mn_now;
2177
2178 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2179
2180 ANHE_at_cache (timers [HEAP0]);
2181 downheap (timers, timercnt, HEAP0);
2182 }
2183 else
2184 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2185
2186 EV_FREQUENT_CHECK;
2187 feed_reverse (EV_A_ (W)w);
2188 }
2189 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2190
2191 feed_reverse_done (EV_A_ EV_TIMER);
2192 }
2193}
2194
2195#if EV_PERIODIC_ENABLE
2196/* make periodics pending */
2197inline_size void
2198periodics_reify (EV_P)
2199{
2200 EV_FREQUENT_CHECK;
2201
2202 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2203 {
2204 int feed_count = 0;
2205
2206 do
2207 {
2208 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2209
2210 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2211
2212 /* first reschedule or stop timer */
2213 if (w->reschedule_cb)
2214 {
2215 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2216
2217 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2218
2219 ANHE_at_cache (periodics [HEAP0]);
2220 downheap (periodics, periodiccnt, HEAP0);
2221 }
2222 else if (w->interval)
2223 {
2224 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2225 /* if next trigger time is not sufficiently in the future, put it there */
2226 /* this might happen because of floating point inexactness */
2227 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2228 {
2229 ev_at (w) += w->interval;
2230
2231 /* if interval is unreasonably low we might still have a time in the past */
2232 /* so correct this. this will make the periodic very inexact, but the user */
2233 /* has effectively asked to get triggered more often than possible */
2234 if (ev_at (w) < ev_rt_now)
2235 ev_at (w) = ev_rt_now;
2236 }
2237
2238 ANHE_at_cache (periodics [HEAP0]);
2239 downheap (periodics, periodiccnt, HEAP0);
2240 }
2241 else
2242 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2243
2244 EV_FREQUENT_CHECK;
2245 feed_reverse (EV_A_ (W)w);
2246 }
2247 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2248
2249 feed_reverse_done (EV_A_ EV_PERIODIC);
2250 }
2251}
2252
2253/* simply recalculate all periodics */
2254/* TODO: maybe ensure that at least one event happens when jumping forward? */
2255static void noinline
2256periodics_reschedule (EV_P)
2257{
2258 int i;
2259
2260 /* adjust periodics after time jump */
2261 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2262 {
2263 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2264
2265 if (w->reschedule_cb)
2266 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2267 else if (w->interval)
2268 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2269
2270 ANHE_at_cache (periodics [i]);
2271 }
2272
2273 reheap (periodics, periodiccnt);
2274}
2275#endif
2276
2277/* adjust all timers by a given offset */
2278static void noinline
2279timers_reschedule (EV_P_ ev_tstamp adjust)
2280{
2281 int i;
2282
2283 for (i = 0; i < timercnt; ++i)
2284 {
2285 ANHE *he = timers + i + HEAP0;
2286 ANHE_w (*he)->at += adjust;
2287 ANHE_at_cache (*he);
2288 }
2289}
2290
2291/* fetch new monotonic and realtime times from the kernel */
2292/* also detect if there was a timejump, and act accordingly */
2293inline_speed void
2294time_update (EV_P_ ev_tstamp max_block)
2295{
2296#if EV_USE_MONOTONIC
2297 if (expect_true (have_monotonic))
2298 {
2299 int i;
2300 ev_tstamp odiff = rtmn_diff;
2301
2302 mn_now = get_clock ();
2303
2304 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2305 /* interpolate in the meantime */
2306 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2307 {
2308 ev_rt_now = rtmn_diff + mn_now;
2309 return;
2310 }
2311
2312 now_floor = mn_now;
2313 ev_rt_now = ev_time ();
2314
2315 /* loop a few times, before making important decisions.
2316 * on the choice of "4": one iteration isn't enough,
2317 * in case we get preempted during the calls to
2318 * ev_time and get_clock. a second call is almost guaranteed
2319 * to succeed in that case, though. and looping a few more times
2320 * doesn't hurt either as we only do this on time-jumps or
2321 * in the unlikely event of having been preempted here.
2322 */
2323 for (i = 4; --i; )
2324 {
2325 rtmn_diff = ev_rt_now - mn_now;
2326
2327 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2328 return; /* all is well */
2329
2330 ev_rt_now = ev_time ();
2331 mn_now = get_clock ();
2332 now_floor = mn_now;
2333 }
2334
2335 /* no timer adjustment, as the monotonic clock doesn't jump */
2336 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2337# if EV_PERIODIC_ENABLE
2338 periodics_reschedule (EV_A);
2339# endif
2340 }
2341 else
2342#endif
2343 {
2344 ev_rt_now = ev_time ();
2345
2346 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2347 {
2348 /* adjust timers. this is easy, as the offset is the same for all of them */
2349 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2350#if EV_PERIODIC_ENABLE
2351 periodics_reschedule (EV_A);
2352#endif
2353 }
2354
2355 mn_now = ev_rt_now;
2356 }
2357}
2358
2359void
2360ev_run (EV_P_ int flags)
2361{
2362#if EV_FEATURE_API
2363 ++loop_depth;
2364#endif
2365
2366 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2367
2368 loop_done = EVBREAK_CANCEL;
2369
2370 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2371
2372 do
2373 {
2374#if EV_VERIFY >= 2
2375 ev_verify (EV_A);
2376#endif
2377
2378#ifndef _WIN32
2379 if (expect_false (curpid)) /* penalise the forking check even more */
2380 if (expect_false (getpid () != curpid))
2381 {
2382 curpid = getpid ();
2383 postfork = 1;
2384 }
2385#endif
2386
2387#if EV_FORK_ENABLE
2388 /* we might have forked, so queue fork handlers */
2389 if (expect_false (postfork))
2390 if (forkcnt)
2391 {
2392 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2393 EV_INVOKE_PENDING;
2394 }
2395#endif
2396
2397#if EV_PREPARE_ENABLE
2398 /* queue prepare watchers (and execute them) */
2399 if (expect_false (preparecnt))
2400 {
2401 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2402 EV_INVOKE_PENDING;
2403 }
2404#endif
2405
2406 if (expect_false (loop_done))
2407 break;
2408
2409 /* we might have forked, so reify kernel state if necessary */
2410 if (expect_false (postfork))
2411 loop_fork (EV_A);
2412
2413 /* update fd-related kernel structures */
2414 fd_reify (EV_A);
2415
2416 /* calculate blocking time */
2417 {
2418 ev_tstamp waittime = 0.;
2419 ev_tstamp sleeptime = 0.;
2420
2421 /* remember old timestamp for io_blocktime calculation */
2422 ev_tstamp prev_mn_now = mn_now;
2423
2424 /* update time to cancel out callback processing overhead */
2425 time_update (EV_A_ 1e100);
2426
2427 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt)))
2428 {
2429 waittime = MAX_BLOCKTIME;
2430
2431 if (timercnt)
2432 {
2433 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2434 if (waittime > to) waittime = to;
2435 }
2436
2437#if EV_PERIODIC_ENABLE
2438 if (periodiccnt)
2439 {
2440 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2441 if (waittime > to) waittime = to;
2442 }
2443#endif
2444
2445 /* don't let timeouts decrease the waittime below timeout_blocktime */
2446 if (expect_false (waittime < timeout_blocktime))
2447 waittime = timeout_blocktime;
2448
2449 /* extra check because io_blocktime is commonly 0 */
2450 if (expect_false (io_blocktime))
2451 {
2452 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2453
2454 if (sleeptime > waittime - backend_fudge)
2455 sleeptime = waittime - backend_fudge;
2456
2457 if (expect_true (sleeptime > 0.))
2458 {
2459 ev_sleep (sleeptime);
2460 waittime -= sleeptime;
2461 }
2462 }
2463 }
2464
2465#if EV_FEATURE_API
2466 ++loop_count;
2467#endif
2468 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2469 backend_poll (EV_A_ waittime);
2470 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2471
2472 /* update ev_rt_now, do magic */
2473 time_update (EV_A_ waittime + sleeptime);
2474 }
2475
2476 /* queue pending timers and reschedule them */
2477 timers_reify (EV_A); /* relative timers called last */
2478#if EV_PERIODIC_ENABLE
2479 periodics_reify (EV_A); /* absolute timers called first */
2480#endif
2481
2482#if EV_IDLE_ENABLE
2483 /* queue idle watchers unless other events are pending */
2484 idle_reify (EV_A);
2485#endif
2486
2487#if EV_CHECK_ENABLE
2488 /* queue check watchers, to be executed first */
2489 if (expect_false (checkcnt))
2490 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2491#endif
2492
2493 EV_INVOKE_PENDING;
2494 }
2495 while (expect_true (
2496 activecnt
2497 && !loop_done
2498 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2499 ));
2500
2501 if (loop_done == EVBREAK_ONE)
2502 loop_done = EVBREAK_CANCEL;
2503
2504#if EV_FEATURE_API
2505 --loop_depth;
2506#endif
2507}
2508
2509void
2510ev_break (EV_P_ int how)
2511{
2512 loop_done = how;
2513}
2514
2515void
2516ev_ref (EV_P)
2517{
2518 ++activecnt;
2519}
2520
2521void
2522ev_unref (EV_P)
2523{
2524 --activecnt;
2525}
2526
2527void
2528ev_now_update (EV_P)
2529{
2530 time_update (EV_A_ 1e100);
2531}
2532
2533void
2534ev_suspend (EV_P)
2535{
2536 ev_now_update (EV_A);
2537}
2538
2539void
2540ev_resume (EV_P)
2541{
2542 ev_tstamp mn_prev = mn_now;
2543
2544 ev_now_update (EV_A);
2545 timers_reschedule (EV_A_ mn_now - mn_prev);
2546#if EV_PERIODIC_ENABLE
2547 /* TODO: really do this? */
2548 periodics_reschedule (EV_A);
2549#endif
2550}
2551
2552/*****************************************************************************/
2553/* singly-linked list management, used when the expected list length is short */
2554
2555inline_size void
2556wlist_add (WL *head, WL elem)
2557{
2558 elem->next = *head;
2559 *head = elem;
2560}
2561
2562inline_size void
2563wlist_del (WL *head, WL elem)
2564{
2565 while (*head)
2566 {
2567 if (expect_true (*head == elem))
2568 {
2569 *head = elem->next;
2570 break;
2571 }
2572
2573 head = &(*head)->next;
2574 }
2575}
2576
2577/* internal, faster, version of ev_clear_pending */
2578inline_speed void
2579clear_pending (EV_P_ W w)
2580{
2581 if (w->pending)
2582 {
2583 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2584 w->pending = 0;
2585 }
2586}
2587
2588int
2589ev_clear_pending (EV_P_ void *w)
2590{
2591 W w_ = (W)w;
2592 int pending = w_->pending;
2593
2594 if (expect_true (pending))
2595 {
2596 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2597 p->w = (W)&pending_w;
2598 w_->pending = 0;
2599 return p->events;
2600 }
2601 else
2602 return 0;
2603}
2604
2605inline_size void
2606pri_adjust (EV_P_ W w)
2607{
2608 int pri = ev_priority (w);
2609 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2610 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2611 ev_set_priority (w, pri);
2612}
2613
2614inline_speed void
2615ev_start (EV_P_ W w, int active)
2616{
2617 pri_adjust (EV_A_ w);
2618 w->active = active;
2619 ev_ref (EV_A);
2620}
2621
2622inline_size void
2623ev_stop (EV_P_ W w)
2624{
2625 ev_unref (EV_A);
2626 w->active = 0;
2627}
2628
2629/*****************************************************************************/
2630
2631void noinline
2632ev_io_start (EV_P_ ev_io *w)
2633{
2634 int fd = w->fd;
2635
2636 if (expect_false (ev_is_active (w)))
2637 return;
2638
2639 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2640 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2641
2642 EV_FREQUENT_CHECK;
2643
2644 ev_start (EV_A_ (W)w, 1);
2645 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2646 wlist_add (&anfds[fd].head, (WL)w);
2647
2648 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2649 w->events &= ~EV__IOFDSET;
2650
2651 EV_FREQUENT_CHECK;
2652}
2653
2654void noinline
2655ev_io_stop (EV_P_ ev_io *w)
2656{
2657 clear_pending (EV_A_ (W)w);
2658 if (expect_false (!ev_is_active (w)))
2659 return;
2660
2661 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2662
2663 EV_FREQUENT_CHECK;
2664
2665 wlist_del (&anfds[w->fd].head, (WL)w);
2666 ev_stop (EV_A_ (W)w);
2667
2668 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2669
2670 EV_FREQUENT_CHECK;
2671}
2672
2673void noinline
2674ev_timer_start (EV_P_ ev_timer *w)
2675{
2676 if (expect_false (ev_is_active (w)))
2677 return;
2678
2679 ev_at (w) += mn_now;
2680
2681 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2682
2683 EV_FREQUENT_CHECK;
2684
2685 ++timercnt;
2686 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2687 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2688 ANHE_w (timers [ev_active (w)]) = (WT)w;
2689 ANHE_at_cache (timers [ev_active (w)]);
2690 upheap (timers, ev_active (w));
2691
2692 EV_FREQUENT_CHECK;
2693
2694 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2695}
2696
2697void noinline
2698ev_timer_stop (EV_P_ ev_timer *w)
2699{
2700 clear_pending (EV_A_ (W)w);
2701 if (expect_false (!ev_is_active (w)))
2702 return;
2703
2704 EV_FREQUENT_CHECK;
2705
2706 {
2707 int active = ev_active (w);
2708
2709 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2710
2711 --timercnt;
2712
2713 if (expect_true (active < timercnt + HEAP0))
2714 {
2715 timers [active] = timers [timercnt + HEAP0];
2716 adjustheap (timers, timercnt, active);
2717 }
2718 }
2719
2720 ev_at (w) -= mn_now;
2721
2722 ev_stop (EV_A_ (W)w);
2723
2724 EV_FREQUENT_CHECK;
2725}
2726
2727void noinline
2728ev_timer_again (EV_P_ ev_timer *w)
2729{
2730 EV_FREQUENT_CHECK;
2731
2732 if (ev_is_active (w))
2733 {
416 if (w->repeat) 2734 if (w->repeat)
417 { 2735 {
418 if (w->is_abs)
419 w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
420 else
421 w->at = now + w->repeat; 2736 ev_at (w) = mn_now + w->repeat;
422 2737 ANHE_at_cache (timers [ev_active (w)]);
423 assert (w->at > now);
424
425 downheap (timers, timercnt, 0); 2738 adjustheap (timers, timercnt, ev_active (w));
426 } 2739 }
427 else 2740 else
2741 ev_timer_stop (EV_A_ w);
2742 }
2743 else if (w->repeat)
2744 {
2745 ev_at (w) = w->repeat;
2746 ev_timer_start (EV_A_ w);
2747 }
2748
2749 EV_FREQUENT_CHECK;
2750}
2751
2752ev_tstamp
2753ev_timer_remaining (EV_P_ ev_timer *w)
2754{
2755 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2756}
2757
2758#if EV_PERIODIC_ENABLE
2759void noinline
2760ev_periodic_start (EV_P_ ev_periodic *w)
2761{
2762 if (expect_false (ev_is_active (w)))
2763 return;
2764
2765 if (w->reschedule_cb)
2766 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2767 else if (w->interval)
2768 {
2769 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2770 /* this formula differs from the one in periodic_reify because we do not always round up */
2771 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2772 }
2773 else
2774 ev_at (w) = w->offset;
2775
2776 EV_FREQUENT_CHECK;
2777
2778 ++periodiccnt;
2779 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2780 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2781 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2782 ANHE_at_cache (periodics [ev_active (w)]);
2783 upheap (periodics, ev_active (w));
2784
2785 EV_FREQUENT_CHECK;
2786
2787 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2788}
2789
2790void noinline
2791ev_periodic_stop (EV_P_ ev_periodic *w)
2792{
2793 clear_pending (EV_A_ (W)w);
2794 if (expect_false (!ev_is_active (w)))
2795 return;
2796
2797 EV_FREQUENT_CHECK;
2798
2799 {
2800 int active = ev_active (w);
2801
2802 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2803
2804 --periodiccnt;
2805
2806 if (expect_true (active < periodiccnt + HEAP0))
2807 {
2808 periodics [active] = periodics [periodiccnt + HEAP0];
2809 adjustheap (periodics, periodiccnt, active);
2810 }
2811 }
2812
2813 ev_stop (EV_A_ (W)w);
2814
2815 EV_FREQUENT_CHECK;
2816}
2817
2818void noinline
2819ev_periodic_again (EV_P_ ev_periodic *w)
2820{
2821 /* TODO: use adjustheap and recalculation */
2822 ev_periodic_stop (EV_A_ w);
2823 ev_periodic_start (EV_A_ w);
2824}
2825#endif
2826
2827#ifndef SA_RESTART
2828# define SA_RESTART 0
2829#endif
2830
2831#if EV_SIGNAL_ENABLE
2832
2833void noinline
2834ev_signal_start (EV_P_ ev_signal *w)
2835{
2836 if (expect_false (ev_is_active (w)))
2837 return;
2838
2839 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2840
2841#if EV_MULTIPLICITY
2842 assert (("libev: a signal must not be attached to two different loops",
2843 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2844
2845 signals [w->signum - 1].loop = EV_A;
2846#endif
2847
2848 EV_FREQUENT_CHECK;
2849
2850#if EV_USE_SIGNALFD
2851 if (sigfd == -2)
2852 {
2853 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2854 if (sigfd < 0 && errno == EINVAL)
2855 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2856
2857 if (sigfd >= 0)
428 { 2858 {
429 evtimer_stop (w); /* nonrepeating: stop timer */ 2859 fd_intern (sigfd); /* doing it twice will not hurt */
430 --timercnt; /* maybe pass by reference instead? */ 2860
2861 sigemptyset (&sigfd_set);
2862
2863 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2864 ev_set_priority (&sigfd_w, EV_MAXPRI);
2865 ev_io_start (EV_A_ &sigfd_w);
2866 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
431 } 2867 }
2868 }
432 2869
433 event ((W)w, EV_TIMEOUT); 2870 if (sigfd >= 0)
2871 {
2872 /* TODO: check .head */
2873 sigaddset (&sigfd_set, w->signum);
2874 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2875
2876 signalfd (sigfd, &sigfd_set, 0);
2877 }
2878#endif
2879
2880 ev_start (EV_A_ (W)w, 1);
2881 wlist_add (&signals [w->signum - 1].head, (WL)w);
2882
2883 if (!((WL)w)->next)
2884# if EV_USE_SIGNALFD
2885 if (sigfd < 0) /*TODO*/
2886# endif
2887 {
2888# ifdef _WIN32
2889 evpipe_init (EV_A);
2890
2891 signal (w->signum, ev_sighandler);
2892# else
2893 struct sigaction sa;
2894
2895 evpipe_init (EV_A);
2896
2897 sa.sa_handler = ev_sighandler;
2898 sigfillset (&sa.sa_mask);
2899 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2900 sigaction (w->signum, &sa, 0);
2901
2902 if (origflags & EVFLAG_NOSIGMASK)
2903 {
2904 sigemptyset (&sa.sa_mask);
2905 sigaddset (&sa.sa_mask, w->signum);
2906 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2907 }
2908#endif
2909 }
2910
2911 EV_FREQUENT_CHECK;
2912}
2913
2914void noinline
2915ev_signal_stop (EV_P_ ev_signal *w)
2916{
2917 clear_pending (EV_A_ (W)w);
2918 if (expect_false (!ev_is_active (w)))
2919 return;
2920
2921 EV_FREQUENT_CHECK;
2922
2923 wlist_del (&signals [w->signum - 1].head, (WL)w);
2924 ev_stop (EV_A_ (W)w);
2925
2926 if (!signals [w->signum - 1].head)
2927 {
2928#if EV_MULTIPLICITY
2929 signals [w->signum - 1].loop = 0; /* unattach from signal */
2930#endif
2931#if EV_USE_SIGNALFD
2932 if (sigfd >= 0)
2933 {
2934 sigset_t ss;
2935
2936 sigemptyset (&ss);
2937 sigaddset (&ss, w->signum);
2938 sigdelset (&sigfd_set, w->signum);
2939
2940 signalfd (sigfd, &sigfd_set, 0);
2941 sigprocmask (SIG_UNBLOCK, &ss, 0);
2942 }
2943 else
2944#endif
2945 signal (w->signum, SIG_DFL);
2946 }
2947
2948 EV_FREQUENT_CHECK;
2949}
2950
2951#endif
2952
2953#if EV_CHILD_ENABLE
2954
2955void
2956ev_child_start (EV_P_ ev_child *w)
2957{
2958#if EV_MULTIPLICITY
2959 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2960#endif
2961 if (expect_false (ev_is_active (w)))
2962 return;
2963
2964 EV_FREQUENT_CHECK;
2965
2966 ev_start (EV_A_ (W)w, 1);
2967 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2968
2969 EV_FREQUENT_CHECK;
2970}
2971
2972void
2973ev_child_stop (EV_P_ ev_child *w)
2974{
2975 clear_pending (EV_A_ (W)w);
2976 if (expect_false (!ev_is_active (w)))
2977 return;
2978
2979 EV_FREQUENT_CHECK;
2980
2981 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2982 ev_stop (EV_A_ (W)w);
2983
2984 EV_FREQUENT_CHECK;
2985}
2986
2987#endif
2988
2989#if EV_STAT_ENABLE
2990
2991# ifdef _WIN32
2992# undef lstat
2993# define lstat(a,b) _stati64 (a,b)
2994# endif
2995
2996#define DEF_STAT_INTERVAL 5.0074891
2997#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2998#define MIN_STAT_INTERVAL 0.1074891
2999
3000static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3001
3002#if EV_USE_INOTIFY
3003
3004/* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3005# define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3006
3007static void noinline
3008infy_add (EV_P_ ev_stat *w)
3009{
3010 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);
3011
3012 if (w->wd >= 0)
3013 {
3014 struct statfs sfs;
3015
3016 /* now local changes will be tracked by inotify, but remote changes won't */
3017 /* unless the filesystem is known to be local, we therefore still poll */
3018 /* also do poll on <2.6.25, but with normal frequency */
3019
3020 if (!fs_2625)
3021 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3022 else if (!statfs (w->path, &sfs)
3023 && (sfs.f_type == 0x1373 /* devfs */
3024 || sfs.f_type == 0xEF53 /* ext2/3 */
3025 || sfs.f_type == 0x3153464a /* jfs */
3026 || sfs.f_type == 0x52654973 /* reiser3 */
3027 || sfs.f_type == 0x01021994 /* tempfs */
3028 || sfs.f_type == 0x58465342 /* xfs */))
3029 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3030 else
3031 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3032 }
3033 else
3034 {
3035 /* can't use inotify, continue to stat */
3036 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3037
3038 /* if path is not there, monitor some parent directory for speedup hints */
3039 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3040 /* but an efficiency issue only */
3041 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3042 {
3043 char path [4096];
3044 strcpy (path, w->path);
3045
3046 do
3047 {
3048 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3049 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3050
3051 char *pend = strrchr (path, '/');
3052
3053 if (!pend || pend == path)
3054 break;
3055
3056 *pend = 0;
3057 w->wd = inotify_add_watch (fs_fd, path, mask);
3058 }
3059 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3060 }
3061 }
3062
3063 if (w->wd >= 0)
3064 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3065
3066 /* now re-arm timer, if required */
3067 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3068 ev_timer_again (EV_A_ &w->timer);
3069 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3070}
3071
3072static void noinline
3073infy_del (EV_P_ ev_stat *w)
3074{
3075 int slot;
3076 int wd = w->wd;
3077
3078 if (wd < 0)
3079 return;
3080
3081 w->wd = -2;
3082 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3083 wlist_del (&fs_hash [slot].head, (WL)w);
3084
3085 /* remove this watcher, if others are watching it, they will rearm */
3086 inotify_rm_watch (fs_fd, wd);
3087}
3088
3089static void noinline
3090infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3091{
3092 if (slot < 0)
3093 /* overflow, need to check for all hash slots */
3094 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3095 infy_wd (EV_A_ slot, wd, ev);
3096 else
3097 {
3098 WL w_;
3099
3100 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3101 {
3102 ev_stat *w = (ev_stat *)w_;
3103 w_ = w_->next; /* lets us remove this watcher and all before it */
3104
3105 if (w->wd == wd || wd == -1)
3106 {
3107 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3108 {
3109 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3110 w->wd = -1;
3111 infy_add (EV_A_ w); /* re-add, no matter what */
3112 }
3113
3114 stat_timer_cb (EV_A_ &w->timer, 0);
3115 }
3116 }
434 } 3117 }
435} 3118}
436 3119
437static void 3120static void
438time_update () 3121infy_cb (EV_P_ ev_io *w, int revents)
439{ 3122{
3123 char buf [EV_INOTIFY_BUFSIZE];
440 int i; 3124 int ofs;
441 ev_now = ev_time (); 3125 int len = read (fs_fd, buf, sizeof (buf));
442 3126
443 if (have_monotonic) 3127 for (ofs = 0; ofs < len; )
3128 {
3129 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3130 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3131 ofs += sizeof (struct inotify_event) + ev->len;
444 { 3132 }
445 ev_tstamp odiff = diff; 3133}
446 3134
447 /* detecting time jumps is much more difficult */ 3135inline_size void
448 for (i = 2; --i; ) /* loop a few times, before making important decisions */ 3136ev_check_2625 (EV_P)
3137{
3138 /* kernels < 2.6.25 are borked
3139 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3140 */
3141 if (ev_linux_version () < 0x020619)
3142 return;
3143
3144 fs_2625 = 1;
3145}
3146
3147inline_size int
3148infy_newfd (void)
3149{
3150#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3151 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3152 if (fd >= 0)
3153 return fd;
3154#endif
3155 return inotify_init ();
3156}
3157
3158inline_size void
3159infy_init (EV_P)
3160{
3161 if (fs_fd != -2)
3162 return;
3163
3164 fs_fd = -1;
3165
3166 ev_check_2625 (EV_A);
3167
3168 fs_fd = infy_newfd ();
3169
3170 if (fs_fd >= 0)
3171 {
3172 fd_intern (fs_fd);
3173 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3174 ev_set_priority (&fs_w, EV_MAXPRI);
3175 ev_io_start (EV_A_ &fs_w);
3176 ev_unref (EV_A);
3177 }
3178}
3179
3180inline_size void
3181infy_fork (EV_P)
3182{
3183 int slot;
3184
3185 if (fs_fd < 0)
3186 return;
3187
3188 ev_ref (EV_A);
3189 ev_io_stop (EV_A_ &fs_w);
3190 close (fs_fd);
3191 fs_fd = infy_newfd ();
3192
3193 if (fs_fd >= 0)
3194 {
3195 fd_intern (fs_fd);
3196 ev_io_set (&fs_w, fs_fd, EV_READ);
3197 ev_io_start (EV_A_ &fs_w);
3198 ev_unref (EV_A);
3199 }
3200
3201 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3202 {
3203 WL w_ = fs_hash [slot].head;
3204 fs_hash [slot].head = 0;
3205
3206 while (w_)
449 { 3207 {
450 now = get_clock (); 3208 ev_stat *w = (ev_stat *)w_;
451 diff = ev_now - now; 3209 w_ = w_->next; /* lets us add this watcher */
452 3210
453 if (fabs (odiff - diff) < MIN_TIMEJUMP) 3211 w->wd = -1;
454 return; /* all is well */
455 3212
456 ev_now = ev_time (); 3213 if (fs_fd >= 0)
3214 infy_add (EV_A_ w); /* re-add, no matter what */
3215 else
3216 {
3217 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3218 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3219 ev_timer_again (EV_A_ &w->timer);
3220 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3221 }
457 } 3222 }
3223 }
3224}
458 3225
459 /* time jump detected, reschedule atimers */ 3226#endif
3227
3228#ifdef _WIN32
3229# define EV_LSTAT(p,b) _stati64 (p, b)
3230#else
3231# define EV_LSTAT(p,b) lstat (p, b)
3232#endif
3233
3234void
3235ev_stat_stat (EV_P_ ev_stat *w)
3236{
3237 if (lstat (w->path, &w->attr) < 0)
3238 w->attr.st_nlink = 0;
3239 else if (!w->attr.st_nlink)
3240 w->attr.st_nlink = 1;
3241}
3242
3243static void noinline
3244stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3245{
3246 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3247
3248 ev_statdata prev = w->attr;
3249 ev_stat_stat (EV_A_ w);
3250
3251 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3252 if (
3253 prev.st_dev != w->attr.st_dev
3254 || prev.st_ino != w->attr.st_ino
3255 || prev.st_mode != w->attr.st_mode
3256 || prev.st_nlink != w->attr.st_nlink
3257 || prev.st_uid != w->attr.st_uid
3258 || prev.st_gid != w->attr.st_gid
3259 || prev.st_rdev != w->attr.st_rdev
3260 || prev.st_size != w->attr.st_size
3261 || prev.st_atime != w->attr.st_atime
3262 || prev.st_mtime != w->attr.st_mtime
3263 || prev.st_ctime != w->attr.st_ctime
3264 ) {
3265 /* we only update w->prev on actual differences */
3266 /* in case we test more often than invoke the callback, */
3267 /* to ensure that prev is always different to attr */
3268 w->prev = prev;
3269
3270 #if EV_USE_INOTIFY
3271 if (fs_fd >= 0)
3272 {
3273 infy_del (EV_A_ w);
3274 infy_add (EV_A_ w);
3275 ev_stat_stat (EV_A_ w); /* avoid race... */
3276 }
3277 #endif
3278
3279 ev_feed_event (EV_A_ w, EV_STAT);
3280 }
3281}
3282
3283void
3284ev_stat_start (EV_P_ ev_stat *w)
3285{
3286 if (expect_false (ev_is_active (w)))
3287 return;
3288
3289 ev_stat_stat (EV_A_ w);
3290
3291 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3292 w->interval = MIN_STAT_INTERVAL;
3293
3294 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3295 ev_set_priority (&w->timer, ev_priority (w));
3296
3297#if EV_USE_INOTIFY
3298 infy_init (EV_A);
3299
3300 if (fs_fd >= 0)
3301 infy_add (EV_A_ w);
3302 else
3303#endif
3304 {
3305 ev_timer_again (EV_A_ &w->timer);
3306 ev_unref (EV_A);
3307 }
3308
3309 ev_start (EV_A_ (W)w, 1);
3310
3311 EV_FREQUENT_CHECK;
3312}
3313
3314void
3315ev_stat_stop (EV_P_ ev_stat *w)
3316{
3317 clear_pending (EV_A_ (W)w);
3318 if (expect_false (!ev_is_active (w)))
3319 return;
3320
3321 EV_FREQUENT_CHECK;
3322
3323#if EV_USE_INOTIFY
3324 infy_del (EV_A_ w);
3325#endif
3326
3327 if (ev_is_active (&w->timer))
3328 {
3329 ev_ref (EV_A);
3330 ev_timer_stop (EV_A_ &w->timer);
3331 }
3332
3333 ev_stop (EV_A_ (W)w);
3334
3335 EV_FREQUENT_CHECK;
3336}
3337#endif
3338
3339#if EV_IDLE_ENABLE
3340void
3341ev_idle_start (EV_P_ ev_idle *w)
3342{
3343 if (expect_false (ev_is_active (w)))
3344 return;
3345
3346 pri_adjust (EV_A_ (W)w);
3347
3348 EV_FREQUENT_CHECK;
3349
3350 {
3351 int active = ++idlecnt [ABSPRI (w)];
3352
3353 ++idleall;
3354 ev_start (EV_A_ (W)w, active);
3355
3356 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3357 idles [ABSPRI (w)][active - 1] = w;
3358 }
3359
3360 EV_FREQUENT_CHECK;
3361}
3362
3363void
3364ev_idle_stop (EV_P_ ev_idle *w)
3365{
3366 clear_pending (EV_A_ (W)w);
3367 if (expect_false (!ev_is_active (w)))
3368 return;
3369
3370 EV_FREQUENT_CHECK;
3371
3372 {
3373 int active = ev_active (w);
3374
3375 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3376 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3377
3378 ev_stop (EV_A_ (W)w);
3379 --idleall;
3380 }
3381
3382 EV_FREQUENT_CHECK;
3383}
3384#endif
3385
3386#if EV_PREPARE_ENABLE
3387void
3388ev_prepare_start (EV_P_ ev_prepare *w)
3389{
3390 if (expect_false (ev_is_active (w)))
3391 return;
3392
3393 EV_FREQUENT_CHECK;
3394
3395 ev_start (EV_A_ (W)w, ++preparecnt);
3396 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3397 prepares [preparecnt - 1] = w;
3398
3399 EV_FREQUENT_CHECK;
3400}
3401
3402void
3403ev_prepare_stop (EV_P_ ev_prepare *w)
3404{
3405 clear_pending (EV_A_ (W)w);
3406 if (expect_false (!ev_is_active (w)))
3407 return;
3408
3409 EV_FREQUENT_CHECK;
3410
3411 {
3412 int active = ev_active (w);
3413
3414 prepares [active - 1] = prepares [--preparecnt];
3415 ev_active (prepares [active - 1]) = active;
3416 }
3417
3418 ev_stop (EV_A_ (W)w);
3419
3420 EV_FREQUENT_CHECK;
3421}
3422#endif
3423
3424#if EV_CHECK_ENABLE
3425void
3426ev_check_start (EV_P_ ev_check *w)
3427{
3428 if (expect_false (ev_is_active (w)))
3429 return;
3430
3431 EV_FREQUENT_CHECK;
3432
3433 ev_start (EV_A_ (W)w, ++checkcnt);
3434 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3435 checks [checkcnt - 1] = w;
3436
3437 EV_FREQUENT_CHECK;
3438}
3439
3440void
3441ev_check_stop (EV_P_ ev_check *w)
3442{
3443 clear_pending (EV_A_ (W)w);
3444 if (expect_false (!ev_is_active (w)))
3445 return;
3446
3447 EV_FREQUENT_CHECK;
3448
3449 {
3450 int active = ev_active (w);
3451
3452 checks [active - 1] = checks [--checkcnt];
3453 ev_active (checks [active - 1]) = active;
3454 }
3455
3456 ev_stop (EV_A_ (W)w);
3457
3458 EV_FREQUENT_CHECK;
3459}
3460#endif
3461
3462#if EV_EMBED_ENABLE
3463void noinline
3464ev_embed_sweep (EV_P_ ev_embed *w)
3465{
3466 ev_run (w->other, EVRUN_NOWAIT);
3467}
3468
3469static void
3470embed_io_cb (EV_P_ ev_io *io, int revents)
3471{
3472 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3473
3474 if (ev_cb (w))
3475 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3476 else
3477 ev_run (w->other, EVRUN_NOWAIT);
3478}
3479
3480static void
3481embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3482{
3483 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3484
3485 {
3486 EV_P = w->other;
3487
3488 while (fdchangecnt)
3489 {
3490 fd_reify (EV_A);
3491 ev_run (EV_A_ EVRUN_NOWAIT);
3492 }
3493 }
3494}
3495
3496static void
3497embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3498{
3499 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3500
3501 ev_embed_stop (EV_A_ w);
3502
3503 {
3504 EV_P = w->other;
3505
3506 ev_loop_fork (EV_A);
3507 ev_run (EV_A_ EVRUN_NOWAIT);
3508 }
3509
3510 ev_embed_start (EV_A_ w);
3511}
3512
3513#if 0
3514static void
3515embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3516{
3517 ev_idle_stop (EV_A_ idle);
3518}
3519#endif
3520
3521void
3522ev_embed_start (EV_P_ ev_embed *w)
3523{
3524 if (expect_false (ev_is_active (w)))
3525 return;
3526
3527 {
3528 EV_P = w->other;
3529 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3530 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3531 }
3532
3533 EV_FREQUENT_CHECK;
3534
3535 ev_set_priority (&w->io, ev_priority (w));
3536 ev_io_start (EV_A_ &w->io);
3537
3538 ev_prepare_init (&w->prepare, embed_prepare_cb);
3539 ev_set_priority (&w->prepare, EV_MINPRI);
3540 ev_prepare_start (EV_A_ &w->prepare);
3541
3542 ev_fork_init (&w->fork, embed_fork_cb);
3543 ev_fork_start (EV_A_ &w->fork);
3544
3545 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3546
3547 ev_start (EV_A_ (W)w, 1);
3548
3549 EV_FREQUENT_CHECK;
3550}
3551
3552void
3553ev_embed_stop (EV_P_ ev_embed *w)
3554{
3555 clear_pending (EV_A_ (W)w);
3556 if (expect_false (!ev_is_active (w)))
3557 return;
3558
3559 EV_FREQUENT_CHECK;
3560
3561 ev_io_stop (EV_A_ &w->io);
3562 ev_prepare_stop (EV_A_ &w->prepare);
3563 ev_fork_stop (EV_A_ &w->fork);
3564
3565 ev_stop (EV_A_ (W)w);
3566
3567 EV_FREQUENT_CHECK;
3568}
3569#endif
3570
3571#if EV_FORK_ENABLE
3572void
3573ev_fork_start (EV_P_ ev_fork *w)
3574{
3575 if (expect_false (ev_is_active (w)))
3576 return;
3577
3578 EV_FREQUENT_CHECK;
3579
3580 ev_start (EV_A_ (W)w, ++forkcnt);
3581 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3582 forks [forkcnt - 1] = w;
3583
3584 EV_FREQUENT_CHECK;
3585}
3586
3587void
3588ev_fork_stop (EV_P_ ev_fork *w)
3589{
3590 clear_pending (EV_A_ (W)w);
3591 if (expect_false (!ev_is_active (w)))
3592 return;
3593
3594 EV_FREQUENT_CHECK;
3595
3596 {
3597 int active = ev_active (w);
3598
3599 forks [active - 1] = forks [--forkcnt];
3600 ev_active (forks [active - 1]) = active;
3601 }
3602
3603 ev_stop (EV_A_ (W)w);
3604
3605 EV_FREQUENT_CHECK;
3606}
3607#endif
3608
3609#if EV_CLEANUP_ENABLE
3610void
3611ev_cleanup_start (EV_P_ ev_cleanup *w)
3612{
3613 if (expect_false (ev_is_active (w)))
3614 return;
3615
3616 EV_FREQUENT_CHECK;
3617
3618 ev_start (EV_A_ (W)w, ++cleanupcnt);
3619 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3620 cleanups [cleanupcnt - 1] = w;
3621
3622 /* cleanup watchers should never keep a refcount on the loop */
3623 ev_unref (EV_A);
3624 EV_FREQUENT_CHECK;
3625}
3626
3627void
3628ev_cleanup_stop (EV_P_ ev_cleanup *w)
3629{
3630 clear_pending (EV_A_ (W)w);
3631 if (expect_false (!ev_is_active (w)))
3632 return;
3633
3634 EV_FREQUENT_CHECK;
3635 ev_ref (EV_A);
3636
3637 {
3638 int active = ev_active (w);
3639
3640 cleanups [active - 1] = cleanups [--cleanupcnt];
3641 ev_active (cleanups [active - 1]) = active;
3642 }
3643
3644 ev_stop (EV_A_ (W)w);
3645
3646 EV_FREQUENT_CHECK;
3647}
3648#endif
3649
3650#if EV_ASYNC_ENABLE
3651void
3652ev_async_start (EV_P_ ev_async *w)
3653{
3654 if (expect_false (ev_is_active (w)))
3655 return;
3656
3657 w->sent = 0;
3658
3659 evpipe_init (EV_A);
3660
3661 EV_FREQUENT_CHECK;
3662
3663 ev_start (EV_A_ (W)w, ++asynccnt);
3664 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3665 asyncs [asynccnt - 1] = w;
3666
3667 EV_FREQUENT_CHECK;
3668}
3669
3670void
3671ev_async_stop (EV_P_ ev_async *w)
3672{
3673 clear_pending (EV_A_ (W)w);
3674 if (expect_false (!ev_is_active (w)))
3675 return;
3676
3677 EV_FREQUENT_CHECK;
3678
3679 {
3680 int active = ev_active (w);
3681
3682 asyncs [active - 1] = asyncs [--asynccnt];
3683 ev_active (asyncs [active - 1]) = active;
3684 }
3685
3686 ev_stop (EV_A_ (W)w);
3687
3688 EV_FREQUENT_CHECK;
3689}
3690
3691void
3692ev_async_send (EV_P_ ev_async *w)
3693{
3694 w->sent = 1;
3695 evpipe_write (EV_A_ &async_pending);
3696}
3697#endif
3698
3699/*****************************************************************************/
3700
3701struct ev_once
3702{
3703 ev_io io;
3704 ev_timer to;
3705 void (*cb)(int revents, void *arg);
3706 void *arg;
3707};
3708
3709static void
3710once_cb (EV_P_ struct ev_once *once, int revents)
3711{
3712 void (*cb)(int revents, void *arg) = once->cb;
3713 void *arg = once->arg;
3714
3715 ev_io_stop (EV_A_ &once->io);
3716 ev_timer_stop (EV_A_ &once->to);
3717 ev_free (once);
3718
3719 cb (revents, arg);
3720}
3721
3722static void
3723once_cb_io (EV_P_ ev_io *w, int revents)
3724{
3725 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3726
3727 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3728}
3729
3730static void
3731once_cb_to (EV_P_ ev_timer *w, int revents)
3732{
3733 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3734
3735 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3736}
3737
3738void
3739ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3740{
3741 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3742
3743 if (expect_false (!once))
3744 {
3745 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3746 return;
3747 }
3748
3749 once->cb = cb;
3750 once->arg = arg;
3751
3752 ev_init (&once->io, once_cb_io);
3753 if (fd >= 0)
3754 {
3755 ev_io_set (&once->io, fd, events);
3756 ev_io_start (EV_A_ &once->io);
3757 }
3758
3759 ev_init (&once->to, once_cb_to);
3760 if (timeout >= 0.)
3761 {
3762 ev_timer_set (&once->to, timeout, 0.);
3763 ev_timer_start (EV_A_ &once->to);
3764 }
3765}
3766
3767/*****************************************************************************/
3768
3769#if EV_WALK_ENABLE
3770void
3771ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3772{
3773 int i, j;
3774 ev_watcher_list *wl, *wn;
3775
3776 if (types & (EV_IO | EV_EMBED))
460 for (i = 0; i < atimercnt; ++i) 3777 for (i = 0; i < anfdmax; ++i)
3778 for (wl = anfds [i].head; wl; )
461 { 3779 {
462 struct ev_timer *w = atimers [i]; 3780 wn = wl->next;
463 w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat; 3781
3782#if EV_EMBED_ENABLE
3783 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3784 {
3785 if (types & EV_EMBED)
3786 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3787 }
3788 else
3789#endif
3790#if EV_USE_INOTIFY
3791 if (ev_cb ((ev_io *)wl) == infy_cb)
3792 ;
3793 else
3794#endif
3795 if ((ev_io *)wl != &pipe_w)
3796 if (types & EV_IO)
3797 cb (EV_A_ EV_IO, wl);
3798
3799 wl = wn;
464 } 3800 }
465 }
466 else
467 {
468 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
469 /* time jump detected, adjust rtimers */
470 for (i = 0; i < rtimercnt; ++i)
471 rtimers [i]->at += ev_now - now;
472 3801
473 now = ev_now; 3802 if (types & (EV_TIMER | EV_STAT))
474 } 3803 for (i = timercnt + HEAP0; i-- > HEAP0; )
475} 3804#if EV_STAT_ENABLE
476 3805 /*TODO: timer is not always active*/
477int ev_loop_done; 3806 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
478 3807 {
479void ev_loop (int flags) 3808 if (types & EV_STAT)
480{ 3809 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
481 double block; 3810 }
482 ev_loop_done = flags & EVLOOP_ONESHOT;
483
484 if (checkcnt)
485 {
486 queue_events ((W *)checks, checkcnt, EV_CHECK);
487 call_pending ();
488 }
489
490 do
491 {
492 /* update fd-related kernel structures */
493 fd_reify ();
494
495 /* calculate blocking time */
496 if (flags & EVLOOP_NONBLOCK || idlecnt)
497 block = 0.;
498 else 3811 else
3812#endif
3813 if (types & EV_TIMER)
3814 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3815
3816#if EV_PERIODIC_ENABLE
3817 if (types & EV_PERIODIC)
3818 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3819 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3820#endif
3821
3822#if EV_IDLE_ENABLE
3823 if (types & EV_IDLE)
3824 for (j = NUMPRI; i--; )
3825 for (i = idlecnt [j]; i--; )
3826 cb (EV_A_ EV_IDLE, idles [j][i]);
3827#endif
3828
3829#if EV_FORK_ENABLE
3830 if (types & EV_FORK)
3831 for (i = forkcnt; i--; )
3832 if (ev_cb (forks [i]) != embed_fork_cb)
3833 cb (EV_A_ EV_FORK, forks [i]);
3834#endif
3835
3836#if EV_ASYNC_ENABLE
3837 if (types & EV_ASYNC)
3838 for (i = asynccnt; i--; )
3839 cb (EV_A_ EV_ASYNC, asyncs [i]);
3840#endif
3841
3842#if EV_PREPARE_ENABLE
3843 if (types & EV_PREPARE)
3844 for (i = preparecnt; i--; )
3845# if EV_EMBED_ENABLE
3846 if (ev_cb (prepares [i]) != embed_prepare_cb)
3847# endif
3848 cb (EV_A_ EV_PREPARE, prepares [i]);
3849#endif
3850
3851#if EV_CHECK_ENABLE
3852 if (types & EV_CHECK)
3853 for (i = checkcnt; i--; )
3854 cb (EV_A_ EV_CHECK, checks [i]);
3855#endif
3856
3857#if EV_SIGNAL_ENABLE
3858 if (types & EV_SIGNAL)
3859 for (i = 0; i < EV_NSIG - 1; ++i)
3860 for (wl = signals [i].head; wl; )
499 { 3861 {
500 block = MAX_BLOCKTIME; 3862 wn = wl->next;
501 3863 cb (EV_A_ EV_SIGNAL, wl);
502 if (rtimercnt) 3864 wl = wn;
503 {
504 ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;
505 if (block > to) block = to;
506 }
507
508 if (atimercnt)
509 {
510 ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;
511 if (block > to) block = to;
512 }
513
514 if (block < 0.) block = 0.;
515 } 3865 }
3866#endif
516 3867
517 method_poll (block); 3868#if EV_CHILD_ENABLE
518 3869 if (types & EV_CHILD)
519 /* update ev_now, do magic */ 3870 for (i = (EV_PID_HASHSIZE); i--; )
520 time_update (); 3871 for (wl = childs [i]; wl; )
521
522 /* queue pending timers and reschedule them */
523 /* absolute timers first */
524 timers_reify (atimers, atimercnt, ev_now);
525 /* relative timers second */
526 timers_reify (rtimers, rtimercnt, now);
527
528 /* queue idle watchers unless io or timers are pending */
529 if (!pendingcnt)
530 queue_events ((W *)idles, idlecnt, EV_IDLE);
531
532 /* queue check and possibly idle watchers */
533 queue_events ((W *)checks, checkcnt, EV_CHECK);
534
535 call_pending ();
536 }
537 while (!ev_loop_done);
538}
539
540/*****************************************************************************/
541
542static void
543wlist_add (WL *head, WL elem)
544{
545 elem->next = *head;
546 *head = elem;
547}
548
549static void
550wlist_del (WL *head, WL elem)
551{
552 while (*head)
553 {
554 if (*head == elem)
555 { 3872 {
556 *head = elem->next; 3873 wn = wl->next;
557 return; 3874 cb (EV_A_ EV_CHILD, wl);
3875 wl = wn;
558 } 3876 }
559
560 head = &(*head)->next;
561 }
562}
563
564static void
565ev_start (W w, int active)
566{
567 w->pending = 0;
568 w->active = active;
569}
570
571static void
572ev_stop (W w)
573{
574 if (w->pending)
575 pendings [w->pending - 1].w = 0;
576
577 w->active = 0;
578 /* nop */
579}
580
581/*****************************************************************************/
582
583void
584evio_start (struct ev_io *w)
585{
586 if (ev_is_active (w))
587 return;
588
589 int fd = w->fd;
590
591 ev_start ((W)w, 1);
592 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
593 wlist_add ((WL *)&anfds[fd].head, (WL)w);
594
595 ++fdchangecnt;
596 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
597 fdchanges [fdchangecnt - 1] = fd;
598}
599
600void
601evio_stop (struct ev_io *w)
602{
603 if (!ev_is_active (w))
604 return;
605
606 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
607 ev_stop ((W)w);
608
609 ++fdchangecnt;
610 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
611 fdchanges [fdchangecnt - 1] = w->fd;
612}
613
614void
615evtimer_start (struct ev_timer *w)
616{
617 if (ev_is_active (w))
618 return;
619
620 if (w->is_abs)
621 {
622 /* this formula differs from the one in timer_reify becuse we do not round up */
623 if (w->repeat)
624 w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
625
626 ev_start ((W)w, ++atimercnt);
627 array_needsize (atimers, atimermax, atimercnt, );
628 atimers [atimercnt - 1] = w;
629 upheap (atimers, atimercnt - 1);
630 }
631 else
632 {
633 w->at += now;
634
635 ev_start ((W)w, ++rtimercnt);
636 array_needsize (rtimers, rtimermax, rtimercnt, );
637 rtimers [rtimercnt - 1] = w;
638 upheap (rtimers, rtimercnt - 1);
639 }
640
641}
642
643void
644evtimer_stop (struct ev_timer *w)
645{
646 if (!ev_is_active (w))
647 return;
648
649 if (w->is_abs)
650 {
651 if (w->active < atimercnt--)
652 {
653 atimers [w->active - 1] = atimers [atimercnt];
654 downheap (atimers, atimercnt, w->active - 1);
655 }
656 }
657 else
658 {
659 if (w->active < rtimercnt--)
660 {
661 rtimers [w->active - 1] = rtimers [rtimercnt];
662 downheap (rtimers, rtimercnt, w->active - 1);
663 }
664 }
665
666 ev_stop ((W)w);
667}
668
669void
670evsignal_start (struct ev_signal *w)
671{
672 if (ev_is_active (w))
673 return;
674
675 ev_start ((W)w, 1);
676 array_needsize (signals, signalmax, w->signum, signals_init);
677 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
678
679 if (!w->next)
680 {
681 struct sigaction sa;
682 sa.sa_handler = sighandler;
683 sigfillset (&sa.sa_mask);
684 sa.sa_flags = 0;
685 sigaction (w->signum, &sa, 0);
686 }
687}
688
689void
690evsignal_stop (struct ev_signal *w)
691{
692 if (!ev_is_active (w))
693 return;
694
695 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
696 ev_stop ((W)w);
697
698 if (!signals [w->signum - 1].head)
699 signal (w->signum, SIG_DFL);
700}
701
702void evidle_start (struct ev_idle *w)
703{
704 if (ev_is_active (w))
705 return;
706
707 ev_start ((W)w, ++idlecnt);
708 array_needsize (idles, idlemax, idlecnt, );
709 idles [idlecnt - 1] = w;
710}
711
712void evidle_stop (struct ev_idle *w)
713{
714 idles [w->active - 1] = idles [--idlecnt];
715 ev_stop ((W)w);
716}
717
718void evcheck_start (struct ev_check *w)
719{
720 if (ev_is_active (w))
721 return;
722
723 ev_start ((W)w, ++checkcnt);
724 array_needsize (checks, checkmax, checkcnt, );
725 checks [checkcnt - 1] = w;
726}
727
728void evcheck_stop (struct ev_check *w)
729{
730 checks [w->active - 1] = checks [--checkcnt];
731 ev_stop ((W)w);
732}
733
734/*****************************************************************************/
735
736#if 0
737
738static void
739sin_cb (struct ev_io *w, int revents)
740{
741 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
742}
743
744static void
745ocb (struct ev_timer *w, int revents)
746{
747 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
748 evtimer_stop (w);
749 evtimer_start (w);
750}
751
752static void
753scb (struct ev_signal *w, int revents)
754{
755 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
756}
757
758static void
759gcb (struct ev_signal *w, int revents)
760{
761 fprintf (stderr, "generic %x\n", revents);
762}
763
764int main (void)
765{
766 struct ev_io sin;
767
768 ev_init (0);
769
770 evw_init (&sin, sin_cb, 55);
771 evio_set (&sin, 0, EV_READ);
772 evio_start (&sin);
773
774 struct ev_timer t[10000];
775
776#if 0
777 int i;
778 for (i = 0; i < 10000; ++i)
779 {
780 struct ev_timer *w = t + i;
781 evw_init (w, ocb, i);
782 evtimer_set_abs (w, drand48 (), 0.99775533);
783 evtimer_start (w);
784 if (drand48 () < 0.5)
785 evtimer_stop (w);
786 }
787#endif 3877#endif
788 3878/* EV_STAT 0x00001000 /* stat data changed */
789 struct ev_timer t1; 3879/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
790 evw_init (&t1, ocb, 0);
791 evtimer_set_abs (&t1, 5, 10);
792 evtimer_start (&t1);
793
794 struct ev_signal sig;
795 evw_init (&sig, scb, 65535);
796 evsignal_set (&sig, SIGQUIT);
797 evsignal_start (&sig);
798
799 struct ev_check cw;
800 evw_init (&cw, gcb, 0);
801 evcheck_start (&cw);
802
803 struct ev_idle iw;
804 evw_init (&iw, gcb, 0);
805 evidle_start (&iw);
806
807 ev_loop (0);
808
809 return 0;
810} 3880}
811
812#endif 3881#endif
813 3882
3883#if EV_MULTIPLICITY
3884 #include "ev_wrap.h"
3885#endif
814 3886
3887EV_CPP(})
815 3888
816

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