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Comparing libev/ev.c (file contents):
Revision 1.20 by root, Wed Oct 31 18:28:00 2007 UTC vs.
Revision 1.316 by root, Fri Sep 18 21:02:12 2009 UTC

1/* 1/*
2 * libev event processing core, watcher management
3 *
2 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libev@schmorp.de>
3 * All rights reserved. 5 * All rights reserved.
4 * 6 *
5 * Redistribution and use in source and binary forms, with or without 7 * Redistribution and use in source and binary forms, with or without modifica-
6 * modification, are permitted provided that the following conditions are 8 * tion, are permitted provided that the following conditions are met:
7 * met: 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.
8 * 27 *
9 * * Redistributions of source code must retain the above copyright 28 * Alternatively, the contents of this file may be used under the terms of
10 * notice, this list of conditions and the following disclaimer. 29 * the GNU General Public License ("GPL") version 2 or any later version,
11 * 30 * in which case the provisions of the GPL are applicable instead of
12 * * Redistributions in binary form must reproduce the above 31 * the above. If you wish to allow the use of your version of this file
13 * copyright notice, this list of conditions and the following 32 * only under the terms of the GPL and not to allow others to use your
14 * disclaimer in the documentation and/or other materials provided 33 * version of this file under the BSD license, indicate your decision
15 * with the distribution. 34 * by deleting the provisions above and replace them with the notice
16 * 35 * and other provisions required by the GPL. If you do not delete the
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 36 * provisions above, a recipient may use your version of this file under
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 37 * either the BSD or the GPL.
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */ 38 */
39
40#ifdef __cplusplus
41extern "C" {
42#endif
43
44/* this big block deduces configuration from config.h */
45#ifndef EV_STANDALONE
46# ifdef EV_CONFIG_H
47# include EV_CONFIG_H
48# else
49# include "config.h"
50# endif
51
52# if HAVE_CLOCK_SYSCALL
53# ifndef EV_USE_CLOCK_SYSCALL
54# define EV_USE_CLOCK_SYSCALL 1
55# ifndef EV_USE_REALTIME
56# define EV_USE_REALTIME 0
57# endif
58# ifndef EV_USE_MONOTONIC
59# define EV_USE_MONOTONIC 1
60# endif
61# endif
62# elif !defined(EV_USE_CLOCK_SYSCALL)
63# define EV_USE_CLOCK_SYSCALL 0
64# endif
65
66# if HAVE_CLOCK_GETTIME
67# ifndef EV_USE_MONOTONIC
68# define EV_USE_MONOTONIC 1
69# endif
70# ifndef EV_USE_REALTIME
71# define EV_USE_REALTIME 0
72# endif
73# else
74# ifndef EV_USE_MONOTONIC
75# define EV_USE_MONOTONIC 0
76# endif
77# ifndef EV_USE_REALTIME
78# define EV_USE_REALTIME 0
79# endif
80# endif
81
82# ifndef EV_USE_NANOSLEEP
83# if HAVE_NANOSLEEP
84# define EV_USE_NANOSLEEP 1
85# else
86# define EV_USE_NANOSLEEP 0
87# endif
88# endif
89
90# ifndef EV_USE_SELECT
91# if HAVE_SELECT && HAVE_SYS_SELECT_H
92# define EV_USE_SELECT 1
93# else
94# define EV_USE_SELECT 0
95# endif
96# endif
97
98# ifndef EV_USE_POLL
99# if HAVE_POLL && HAVE_POLL_H
100# define EV_USE_POLL 1
101# else
102# define EV_USE_POLL 0
103# endif
104# endif
105
106# ifndef EV_USE_EPOLL
107# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
108# define EV_USE_EPOLL 1
109# else
110# define EV_USE_EPOLL 0
111# endif
112# endif
113
114# ifndef EV_USE_KQUEUE
115# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
116# define EV_USE_KQUEUE 1
117# else
118# define EV_USE_KQUEUE 0
119# endif
120# endif
121
122# ifndef EV_USE_PORT
123# if HAVE_PORT_H && HAVE_PORT_CREATE
124# define EV_USE_PORT 1
125# else
126# define EV_USE_PORT 0
127# endif
128# endif
129
130# ifndef EV_USE_INOTIFY
131# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
132# define EV_USE_INOTIFY 1
133# else
134# define EV_USE_INOTIFY 0
135# endif
136# endif
137
138# ifndef EV_USE_SIGNALFD
139# if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
140# define EV_USE_SIGNALFD 1
141# else
142# define EV_USE_SIGNALFD 0
143# endif
144# endif
145
146# ifndef EV_USE_EVENTFD
147# if HAVE_EVENTFD
148# define EV_USE_EVENTFD 1
149# else
150# define EV_USE_EVENTFD 0
151# endif
152# endif
153
154#endif
29 155
30#include <math.h> 156#include <math.h>
31#include <stdlib.h> 157#include <stdlib.h>
32#include <unistd.h>
33#include <fcntl.h> 158#include <fcntl.h>
34#include <signal.h>
35#include <stddef.h> 159#include <stddef.h>
36 160
37#include <stdio.h> 161#include <stdio.h>
38 162
39#include <assert.h> 163#include <assert.h>
40#include <errno.h> 164#include <errno.h>
41#include <sys/time.h> 165#include <sys/types.h>
42#include <time.h> 166#include <time.h>
43 167
168#include <signal.h>
169
170#ifdef EV_H
171# include EV_H
172#else
173# include "ev.h"
174#endif
175
176#ifndef _WIN32
177# include <sys/time.h>
178# include <sys/wait.h>
179# include <unistd.h>
180#else
181# include <io.h>
182# define WIN32_LEAN_AND_MEAN
183# include <windows.h>
184# ifndef EV_SELECT_IS_WINSOCKET
185# define EV_SELECT_IS_WINSOCKET 1
186# endif
187#endif
188
189/* this block tries to deduce configuration from header-defined symbols and defaults */
190
191/* try to deduce the maximum number of signals on this platform */
192#if defined (EV_NSIG)
193/* use what's provided */
194#elif defined (NSIG)
195# define EV_NSIG (NSIG)
196#elif defined(_NSIG)
197# define EV_NSIG (_NSIG)
198#elif defined (SIGMAX)
199# define EV_NSIG (SIGMAX+1)
200#elif defined (SIG_MAX)
201# define EV_NSIG (SIG_MAX+1)
202#elif defined (_SIG_MAX)
203# define EV_NSIG (_SIG_MAX+1)
204#elif defined (MAXSIG)
205# define EV_NSIG (MAXSIG+1)
206#elif defined (MAX_SIG)
207# define EV_NSIG (MAX_SIG+1)
208#elif defined (SIGARRAYSIZE)
209# define EV_NSIG SIGARRAYSIZE /* Assume ary[SIGARRAYSIZE] */
210#elif defined (_sys_nsig)
211# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
212#else
213# error "unable to find value for NSIG, please report"
214/* to make it compile regardless, just remove the above line */
215# define EV_NSIG 65
216#endif
217
218#ifndef EV_USE_CLOCK_SYSCALL
219# if __linux && __GLIBC__ >= 2
220# define EV_USE_CLOCK_SYSCALL 1
221# else
222# define EV_USE_CLOCK_SYSCALL 0
223# endif
224#endif
225
44#ifndef HAVE_MONOTONIC 226#ifndef EV_USE_MONOTONIC
227# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
228# define EV_USE_MONOTONIC 1
229# else
230# define EV_USE_MONOTONIC 0
231# endif
232#endif
233
234#ifndef EV_USE_REALTIME
235# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
236#endif
237
238#ifndef EV_USE_NANOSLEEP
239# if _POSIX_C_SOURCE >= 199309L
240# define EV_USE_NANOSLEEP 1
241# else
242# define EV_USE_NANOSLEEP 0
243# endif
244#endif
245
246#ifndef EV_USE_SELECT
247# define EV_USE_SELECT 1
248#endif
249
250#ifndef EV_USE_POLL
251# ifdef _WIN32
252# define EV_USE_POLL 0
253# else
254# define EV_USE_POLL 1
255# endif
256#endif
257
258#ifndef EV_USE_EPOLL
259# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
260# define EV_USE_EPOLL 1
261# else
262# define EV_USE_EPOLL 0
263# endif
264#endif
265
266#ifndef EV_USE_KQUEUE
267# define EV_USE_KQUEUE 0
268#endif
269
270#ifndef EV_USE_PORT
271# define EV_USE_PORT 0
272#endif
273
274#ifndef EV_USE_INOTIFY
275# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
276# define EV_USE_INOTIFY 1
277# else
278# define EV_USE_INOTIFY 0
279# endif
280#endif
281
282#ifndef EV_PID_HASHSIZE
283# if EV_MINIMAL
284# define EV_PID_HASHSIZE 1
285# else
286# define EV_PID_HASHSIZE 16
287# endif
288#endif
289
290#ifndef EV_INOTIFY_HASHSIZE
291# if EV_MINIMAL
292# define EV_INOTIFY_HASHSIZE 1
293# else
294# define EV_INOTIFY_HASHSIZE 16
295# endif
296#endif
297
298#ifndef EV_USE_EVENTFD
299# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
300# define EV_USE_EVENTFD 1
301# else
302# define EV_USE_EVENTFD 0
303# endif
304#endif
305
306#ifndef EV_USE_SIGNALFD
307# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
308# define EV_USE_SIGNALFD 1
309# else
310# define EV_USE_SIGNALFD 0
311# endif
312#endif
313
314#if 0 /* debugging */
315# define EV_VERIFY 3
316# define EV_USE_4HEAP 1
317# define EV_HEAP_CACHE_AT 1
318#endif
319
320#ifndef EV_VERIFY
321# define EV_VERIFY !EV_MINIMAL
322#endif
323
324#ifndef EV_USE_4HEAP
325# define EV_USE_4HEAP !EV_MINIMAL
326#endif
327
328#ifndef EV_HEAP_CACHE_AT
329# define EV_HEAP_CACHE_AT !EV_MINIMAL
330#endif
331
332/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
333/* which makes programs even slower. might work on other unices, too. */
334#if EV_USE_CLOCK_SYSCALL
335# include <syscall.h>
336# ifdef SYS_clock_gettime
337# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
338# undef EV_USE_MONOTONIC
339# define EV_USE_MONOTONIC 1
340# else
341# undef EV_USE_CLOCK_SYSCALL
342# define EV_USE_CLOCK_SYSCALL 0
343# endif
344#endif
345
346/* this block fixes any misconfiguration where we know we run into trouble otherwise */
347
45# ifdef CLOCK_MONOTONIC 348#ifndef CLOCK_MONOTONIC
349# undef EV_USE_MONOTONIC
46# define HAVE_MONOTONIC 1 350# define EV_USE_MONOTONIC 0
351#endif
352
353#ifndef CLOCK_REALTIME
354# undef EV_USE_REALTIME
355# define EV_USE_REALTIME 0
356#endif
357
358#if !EV_STAT_ENABLE
359# undef EV_USE_INOTIFY
360# define EV_USE_INOTIFY 0
361#endif
362
363#if !EV_USE_NANOSLEEP
364# ifndef _WIN32
365# include <sys/select.h>
366# endif
367#endif
368
369#if EV_USE_INOTIFY
370# include <sys/utsname.h>
371# include <sys/statfs.h>
372# include <sys/inotify.h>
373/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
374# ifndef IN_DONT_FOLLOW
375# undef EV_USE_INOTIFY
376# define EV_USE_INOTIFY 0
377# endif
378#endif
379
380#if EV_SELECT_IS_WINSOCKET
381# include <winsock.h>
382#endif
383
384#if EV_USE_EVENTFD
385/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
386# include <stdint.h>
387# ifndef EFD_NONBLOCK
388# define EFD_NONBLOCK O_NONBLOCK
389# endif
390# ifndef EFD_CLOEXEC
391# ifdef O_CLOEXEC
392# define EFD_CLOEXEC O_CLOEXEC
393# else
394# define EFD_CLOEXEC 02000000
47# endif 395# endif
48#endif 396# endif
49 397# ifdef __cplusplus
50#ifndef HAVE_SELECT 398extern "C" {
51# define HAVE_SELECT 1
52#endif 399# endif
53 400int eventfd (unsigned int initval, int flags);
54#ifndef HAVE_EPOLL 401# ifdef __cplusplus
55# define HAVE_EPOLL 0 402}
56#endif 403# endif
404#endif
57 405
58#ifndef HAVE_REALTIME 406#if EV_USE_SIGNALFD
59# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ 407/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
408# include <stdint.h>
409# ifndef SFD_NONBLOCK
410# define SFD_NONBLOCK O_NONBLOCK
60#endif 411# endif
412# ifndef SFD_CLOEXEC
413# ifdef O_CLOEXEC
414# define SFD_CLOEXEC O_CLOEXEC
415# else
416# define SFD_CLOEXEC 02000000
417# endif
418# endif
419# ifdef __cplusplus
420extern "C" {
421# endif
422int signalfd (int fd, const sigset_t *mask, int flags);
423
424struct signalfd_siginfo
425{
426 uint32_t ssi_signo;
427 char pad[128 - sizeof (uint32_t)];
428};
429# ifdef __cplusplus
430}
431# endif
432#endif
433
434
435/**/
436
437#if EV_VERIFY >= 3
438# define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
439#else
440# define EV_FREQUENT_CHECK do { } while (0)
441#endif
442
443/*
444 * This is used to avoid floating point rounding problems.
445 * It is added to ev_rt_now when scheduling periodics
446 * to ensure progress, time-wise, even when rounding
447 * errors are against us.
448 * This value is good at least till the year 4000.
449 * Better solutions welcome.
450 */
451#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
61 452
62#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 453#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
63#define MAX_BLOCKTIME 60. 454#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
64 455
65#include "ev.h" 456#if __GNUC__ >= 4
457# define expect(expr,value) __builtin_expect ((expr),(value))
458# define noinline __attribute__ ((noinline))
459#else
460# define expect(expr,value) (expr)
461# define noinline
462# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
463# define inline
464# endif
465#endif
66 466
467#define expect_false(expr) expect ((expr) != 0, 0)
468#define expect_true(expr) expect ((expr) != 0, 1)
469#define inline_size static inline
470
471#if EV_MINIMAL
472# define inline_speed static noinline
473#else
474# define inline_speed static inline
475#endif
476
477#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
478
479#if EV_MINPRI == EV_MAXPRI
480# define ABSPRI(w) (((W)w), 0)
481#else
482# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
483#endif
484
485#define EMPTY /* required for microsofts broken pseudo-c compiler */
486#define EMPTY2(a,b) /* used to suppress some warnings */
487
67typedef struct ev_watcher *W; 488typedef ev_watcher *W;
68typedef struct ev_watcher_list *WL; 489typedef ev_watcher_list *WL;
69typedef struct ev_watcher_time *WT; 490typedef ev_watcher_time *WT;
70 491
71static ev_tstamp now, diff; /* monotonic clock */ 492#define ev_active(w) ((W)(w))->active
72ev_tstamp ev_now; 493#define ev_at(w) ((WT)(w))->at
73int ev_method;
74 494
75static int have_monotonic; /* runtime */ 495#if EV_USE_REALTIME
496/* sig_atomic_t is used to avoid per-thread variables or locking but still */
497/* giving it a reasonably high chance of working on typical architetcures */
498static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
499#endif
76 500
77static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 501#if EV_USE_MONOTONIC
78static void (*method_modify)(int fd, int oev, int nev); 502static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
79static void (*method_poll)(ev_tstamp timeout); 503#endif
504
505#ifndef EV_FD_TO_WIN32_HANDLE
506# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
507#endif
508#ifndef EV_WIN32_HANDLE_TO_FD
509# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (fd, 0)
510#endif
511#ifndef EV_WIN32_CLOSE_FD
512# define EV_WIN32_CLOSE_FD(fd) close (fd)
513#endif
514
515#ifdef _WIN32
516# include "ev_win32.c"
517#endif
80 518
81/*****************************************************************************/ 519/*****************************************************************************/
82 520
521static void (*syserr_cb)(const char *msg);
522
523void
524ev_set_syserr_cb (void (*cb)(const char *msg))
525{
526 syserr_cb = cb;
527}
528
529static void noinline
530ev_syserr (const char *msg)
531{
532 if (!msg)
533 msg = "(libev) system error";
534
535 if (syserr_cb)
536 syserr_cb (msg);
537 else
538 {
539 perror (msg);
540 abort ();
541 }
542}
543
544static void *
545ev_realloc_emul (void *ptr, long size)
546{
547 /* some systems, notably openbsd and darwin, fail to properly
548 * implement realloc (x, 0) (as required by both ansi c-98 and
549 * the single unix specification, so work around them here.
550 */
551
552 if (size)
553 return realloc (ptr, size);
554
555 free (ptr);
556 return 0;
557}
558
559static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
560
561void
562ev_set_allocator (void *(*cb)(void *ptr, long size))
563{
564 alloc = cb;
565}
566
567inline_speed void *
568ev_realloc (void *ptr, long size)
569{
570 ptr = alloc (ptr, size);
571
572 if (!ptr && size)
573 {
574 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
575 abort ();
576 }
577
578 return ptr;
579}
580
581#define ev_malloc(size) ev_realloc (0, (size))
582#define ev_free(ptr) ev_realloc ((ptr), 0)
583
584/*****************************************************************************/
585
586/* set in reify when reification needed */
587#define EV_ANFD_REIFY 1
588
589/* file descriptor info structure */
590typedef struct
591{
592 WL head;
593 unsigned char events; /* the events watched for */
594 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
595 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
596 unsigned char unused;
597#if EV_USE_EPOLL
598 unsigned int egen; /* generation counter to counter epoll bugs */
599#endif
600#if EV_SELECT_IS_WINSOCKET
601 SOCKET handle;
602#endif
603} ANFD;
604
605/* stores the pending event set for a given watcher */
606typedef struct
607{
608 W w;
609 int events; /* the pending event set for the given watcher */
610} ANPENDING;
611
612#if EV_USE_INOTIFY
613/* hash table entry per inotify-id */
614typedef struct
615{
616 WL head;
617} ANFS;
618#endif
619
620/* Heap Entry */
621#if EV_HEAP_CACHE_AT
622 /* a heap element */
623 typedef struct {
624 ev_tstamp at;
625 WT w;
626 } ANHE;
627
628 #define ANHE_w(he) (he).w /* access watcher, read-write */
629 #define ANHE_at(he) (he).at /* access cached at, read-only */
630 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
631#else
632 /* a heap element */
633 typedef WT ANHE;
634
635 #define ANHE_w(he) (he)
636 #define ANHE_at(he) (he)->at
637 #define ANHE_at_cache(he)
638#endif
639
640#if EV_MULTIPLICITY
641
642 struct ev_loop
643 {
644 ev_tstamp ev_rt_now;
645 #define ev_rt_now ((loop)->ev_rt_now)
646 #define VAR(name,decl) decl;
647 #include "ev_vars.h"
648 #undef VAR
649 };
650 #include "ev_wrap.h"
651
652 static struct ev_loop default_loop_struct;
653 struct ev_loop *ev_default_loop_ptr;
654
655#else
656
657 ev_tstamp ev_rt_now;
658 #define VAR(name,decl) static decl;
659 #include "ev_vars.h"
660 #undef VAR
661
662 static int ev_default_loop_ptr;
663
664#endif
665
666#if EV_MINIMAL < 2
667# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
668# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
669# define EV_INVOKE_PENDING invoke_cb (EV_A)
670#else
671# define EV_RELEASE_CB (void)0
672# define EV_ACQUIRE_CB (void)0
673# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
674#endif
675
676#define EVUNLOOP_RECURSE 0x80
677
678/*****************************************************************************/
679
680#ifndef EV_HAVE_EV_TIME
83ev_tstamp 681ev_tstamp
84ev_time (void) 682ev_time (void)
85{ 683{
86#if HAVE_REALTIME 684#if EV_USE_REALTIME
685 if (expect_true (have_realtime))
686 {
87 struct timespec ts; 687 struct timespec ts;
88 clock_gettime (CLOCK_REALTIME, &ts); 688 clock_gettime (CLOCK_REALTIME, &ts);
89 return ts.tv_sec + ts.tv_nsec * 1e-9; 689 return ts.tv_sec + ts.tv_nsec * 1e-9;
90#else 690 }
691#endif
692
91 struct timeval tv; 693 struct timeval tv;
92 gettimeofday (&tv, 0); 694 gettimeofday (&tv, 0);
93 return tv.tv_sec + tv.tv_usec * 1e-6; 695 return tv.tv_sec + tv.tv_usec * 1e-6;
94#endif
95} 696}
697#endif
96 698
97static ev_tstamp 699inline_size ev_tstamp
98get_clock (void) 700get_clock (void)
99{ 701{
100#if HAVE_MONOTONIC 702#if EV_USE_MONOTONIC
101 if (have_monotonic) 703 if (expect_true (have_monotonic))
102 { 704 {
103 struct timespec ts; 705 struct timespec ts;
104 clock_gettime (CLOCK_MONOTONIC, &ts); 706 clock_gettime (CLOCK_MONOTONIC, &ts);
105 return ts.tv_sec + ts.tv_nsec * 1e-9; 707 return ts.tv_sec + ts.tv_nsec * 1e-9;
106 } 708 }
107#endif 709#endif
108 710
109 return ev_time (); 711 return ev_time ();
110} 712}
111 713
112#define array_needsize(base,cur,cnt,init) \ 714#if EV_MULTIPLICITY
113 if ((cnt) > cur) \ 715ev_tstamp
114 { \ 716ev_now (EV_P)
115 int newcnt = cur ? cur << 1 : 16; \ 717{
116 base = realloc (base, sizeof (*base) * (newcnt)); \ 718 return ev_rt_now;
117 init (base + cur, newcnt - cur); \ 719}
118 cur = newcnt; \ 720#endif
721
722void
723ev_sleep (ev_tstamp delay)
724{
725 if (delay > 0.)
119 } 726 {
727#if EV_USE_NANOSLEEP
728 struct timespec ts;
729
730 ts.tv_sec = (time_t)delay;
731 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
732
733 nanosleep (&ts, 0);
734#elif defined(_WIN32)
735 Sleep ((unsigned long)(delay * 1e3));
736#else
737 struct timeval tv;
738
739 tv.tv_sec = (time_t)delay;
740 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
741
742 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
743 /* something not guaranteed by newer posix versions, but guaranteed */
744 /* by older ones */
745 select (0, 0, 0, 0, &tv);
746#endif
747 }
748}
120 749
121/*****************************************************************************/ 750/*****************************************************************************/
122 751
123typedef struct 752#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
124{
125 struct ev_io *head;
126 unsigned char wev, rev; /* want, received event set */
127} ANFD;
128 753
129static ANFD *anfds; 754/* find a suitable new size for the given array, */
130static int anfdmax; 755/* hopefully by rounding to a ncie-to-malloc size */
131 756inline_size int
132static int *fdchanges; 757array_nextsize (int elem, int cur, int cnt)
133static int fdchangemax, fdchangecnt;
134
135static void
136anfds_init (ANFD *base, int count)
137{ 758{
138 while (count--) 759 int ncur = cur + 1;
139 { 760
140 base->head = 0; 761 do
141 base->wev = base->rev = EV_NONE; 762 ncur <<= 1;
142 ++base; 763 while (cnt > ncur);
764
765 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
766 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
143 } 767 {
144} 768 ncur *= elem;
145 769 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
146typedef struct 770 ncur = ncur - sizeof (void *) * 4;
147{ 771 ncur /= elem;
148 W w;
149 int events;
150} ANPENDING;
151
152static ANPENDING *pendings;
153static int pendingmax, pendingcnt;
154
155static void
156event (W w, int events)
157{
158 if (w->active)
159 { 772 }
773
774 return ncur;
775}
776
777static noinline void *
778array_realloc (int elem, void *base, int *cur, int cnt)
779{
780 *cur = array_nextsize (elem, *cur, cnt);
781 return ev_realloc (base, elem * *cur);
782}
783
784#define array_init_zero(base,count) \
785 memset ((void *)(base), 0, sizeof (*(base)) * (count))
786
787#define array_needsize(type,base,cur,cnt,init) \
788 if (expect_false ((cnt) > (cur))) \
789 { \
790 int ocur_ = (cur); \
791 (base) = (type *)array_realloc \
792 (sizeof (type), (base), &(cur), (cnt)); \
793 init ((base) + (ocur_), (cur) - ocur_); \
794 }
795
796#if 0
797#define array_slim(type,stem) \
798 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
799 { \
800 stem ## max = array_roundsize (stem ## cnt >> 1); \
801 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
802 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
803 }
804#endif
805
806#define array_free(stem, idx) \
807 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
808
809/*****************************************************************************/
810
811/* dummy callback for pending events */
812static void noinline
813pendingcb (EV_P_ ev_prepare *w, int revents)
814{
815}
816
817void noinline
818ev_feed_event (EV_P_ void *w, int revents)
819{
820 W w_ = (W)w;
821 int pri = ABSPRI (w_);
822
823 if (expect_false (w_->pending))
824 pendings [pri][w_->pending - 1].events |= revents;
825 else
826 {
160 w->pending = ++pendingcnt; 827 w_->pending = ++pendingcnt [pri];
161 array_needsize (pendings, pendingmax, pendingcnt, ); 828 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
162 pendings [pendingcnt - 1].w = w; 829 pendings [pri][w_->pending - 1].w = w_;
163 pendings [pendingcnt - 1].events = events; 830 pendings [pri][w_->pending - 1].events = revents;
164 } 831 }
165} 832}
166 833
167static void 834inline_speed void
835feed_reverse (EV_P_ W w)
836{
837 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
838 rfeeds [rfeedcnt++] = w;
839}
840
841inline_size void
842feed_reverse_done (EV_P_ int revents)
843{
844 do
845 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
846 while (rfeedcnt);
847}
848
849inline_speed void
850queue_events (EV_P_ W *events, int eventcnt, int type)
851{
852 int i;
853
854 for (i = 0; i < eventcnt; ++i)
855 ev_feed_event (EV_A_ events [i], type);
856}
857
858/*****************************************************************************/
859
860inline_speed void
168fd_event (int fd, int events) 861fd_event_nc (EV_P_ int fd, int revents)
169{ 862{
170 ANFD *anfd = anfds + fd; 863 ANFD *anfd = anfds + fd;
171 struct ev_io *w; 864 ev_io *w;
172 865
173 for (w = anfd->head; w; w = w->next) 866 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
174 { 867 {
175 int ev = w->events & events; 868 int ev = w->events & revents;
176 869
177 if (ev) 870 if (ev)
178 event ((W)w, ev); 871 ev_feed_event (EV_A_ (W)w, ev);
179 }
180}
181
182static void
183queue_events (W *events, int eventcnt, int type)
184{
185 int i;
186
187 for (i = 0; i < eventcnt; ++i)
188 event (events [i], type);
189}
190
191/* called on EBADF to verify fds */
192static void
193fd_recheck ()
194{
195 int fd;
196
197 for (fd = 0; fd < anfdmax; ++fd)
198 if (anfds [fd].wev)
199 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
200 while (anfds [fd].head)
201 evio_stop (anfds [fd].head);
202}
203
204/*****************************************************************************/
205
206static struct ev_timer **timers;
207static int timermax, timercnt;
208
209static struct ev_periodic **periodics;
210static int periodicmax, periodiccnt;
211
212static void
213upheap (WT *timers, int k)
214{
215 WT w = timers [k];
216
217 while (k && timers [k >> 1]->at > w->at)
218 {
219 timers [k] = timers [k >> 1];
220 timers [k]->active = k + 1;
221 k >>= 1;
222 }
223
224 timers [k] = w;
225 timers [k]->active = k + 1;
226
227}
228
229static void
230downheap (WT *timers, int N, int k)
231{
232 WT w = timers [k];
233
234 while (k < (N >> 1))
235 {
236 int j = k << 1;
237
238 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
239 ++j;
240
241 if (w->at <= timers [j]->at)
242 break;
243
244 timers [k] = timers [j];
245 timers [k]->active = k + 1;
246 k = j;
247 }
248
249 timers [k] = w;
250 timers [k]->active = k + 1;
251}
252
253/*****************************************************************************/
254
255typedef struct
256{
257 struct ev_signal *head;
258 sig_atomic_t gotsig;
259} ANSIG;
260
261static ANSIG *signals;
262static int signalmax;
263
264static int sigpipe [2];
265static sig_atomic_t gotsig;
266static struct ev_io sigev;
267
268static void
269signals_init (ANSIG *base, int count)
270{
271 while (count--)
272 {
273 base->head = 0;
274 base->gotsig = 0;
275 ++base;
276 }
277}
278
279static void
280sighandler (int signum)
281{
282 signals [signum - 1].gotsig = 1;
283
284 if (!gotsig)
285 {
286 gotsig = 1;
287 write (sigpipe [1], &gotsig, 1);
288 }
289}
290
291static void
292sigcb (struct ev_io *iow, int revents)
293{
294 struct ev_signal *w;
295 int sig;
296
297 gotsig = 0;
298 read (sigpipe [0], &revents, 1);
299
300 for (sig = signalmax; sig--; )
301 if (signals [sig].gotsig)
302 {
303 signals [sig].gotsig = 0;
304
305 for (w = signals [sig].head; w; w = w->next)
306 event ((W)w, EV_SIGNAL);
307 } 872 }
308} 873}
309 874
310static void 875/* do not submit kernel events for fds that have reify set */
311siginit (void) 876/* because that means they changed while we were polling for new events */
877inline_speed void
878fd_event (EV_P_ int fd, int revents)
312{ 879{
313 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); 880 ANFD *anfd = anfds + fd;
314 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
315 881
316 /* rather than sort out wether we really need nb, set it */ 882 if (expect_true (!anfd->reify))
317 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 883 fd_event_nc (EV_A_ fd, revents);
318 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
319
320 evio_set (&sigev, sigpipe [0], EV_READ);
321 evio_start (&sigev);
322} 884}
323 885
324/*****************************************************************************/ 886void
325 887ev_feed_fd_event (EV_P_ int fd, int revents)
326static struct ev_idle **idles;
327static int idlemax, idlecnt;
328
329static struct ev_prepare **prepares;
330static int preparemax, preparecnt;
331
332static struct ev_check **checks;
333static int checkmax, checkcnt;
334
335/*****************************************************************************/
336
337#if HAVE_EPOLL
338# include "ev_epoll.c"
339#endif
340#if HAVE_SELECT
341# include "ev_select.c"
342#endif
343
344int ev_init (int flags)
345{ 888{
346#if HAVE_MONOTONIC 889 if (fd >= 0 && fd < anfdmax)
347 { 890 fd_event_nc (EV_A_ fd, revents);
348 struct timespec ts;
349 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
350 have_monotonic = 1;
351 }
352#endif
353
354 ev_now = ev_time ();
355 now = get_clock ();
356 diff = ev_now - now;
357
358 if (pipe (sigpipe))
359 return 0;
360
361 ev_method = EVMETHOD_NONE;
362#if HAVE_EPOLL
363 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
364#endif
365#if HAVE_SELECT
366 if (ev_method == EVMETHOD_NONE) select_init (flags);
367#endif
368
369 if (ev_method)
370 {
371 evw_init (&sigev, sigcb);
372 siginit ();
373 }
374
375 return ev_method;
376} 891}
377 892
378/*****************************************************************************/ 893/* make sure the external fd watch events are in-sync */
379 894/* with the kernel/libev internal state */
380void ev_prefork (void) 895inline_size void
381{ 896fd_reify (EV_P)
382 /* nop */
383}
384
385void ev_postfork_parent (void)
386{
387 /* nop */
388}
389
390void ev_postfork_child (void)
391{
392#if HAVE_EPOLL
393 if (ev_method == EVMETHOD_EPOLL)
394 epoll_postfork_child ();
395#endif
396
397 evio_stop (&sigev);
398 close (sigpipe [0]);
399 close (sigpipe [1]);
400 pipe (sigpipe);
401 siginit ();
402}
403
404/*****************************************************************************/
405
406static void
407fd_reify (void)
408{ 897{
409 int i; 898 int i;
410 899
411 for (i = 0; i < fdchangecnt; ++i) 900 for (i = 0; i < fdchangecnt; ++i)
412 { 901 {
413 int fd = fdchanges [i]; 902 int fd = fdchanges [i];
414 ANFD *anfd = anfds + fd; 903 ANFD *anfd = anfds + fd;
415 struct ev_io *w; 904 ev_io *w;
416 905
417 int wev = 0; 906 unsigned char events = 0;
418 907
419 for (w = anfd->head; w; w = w->next) 908 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
420 wev |= w->events; 909 events |= (unsigned char)w->events;
421 910
422 if (anfd->wev != wev) 911#if EV_SELECT_IS_WINSOCKET
912 if (events)
423 { 913 {
424 method_modify (fd, anfd->wev, wev); 914 unsigned long arg;
425 anfd->wev = wev; 915 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
916 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
426 } 917 }
918#endif
919
920 {
921 unsigned char o_events = anfd->events;
922 unsigned char o_reify = anfd->reify;
923
924 anfd->reify = 0;
925 anfd->events = events;
926
927 if (o_events != events || o_reify & EV__IOFDSET)
928 backend_modify (EV_A_ fd, o_events, events);
929 }
427 } 930 }
428 931
429 fdchangecnt = 0; 932 fdchangecnt = 0;
430} 933}
431 934
935/* something about the given fd changed */
936inline_size void
937fd_change (EV_P_ int fd, int flags)
938{
939 unsigned char reify = anfds [fd].reify;
940 anfds [fd].reify |= flags;
941
942 if (expect_true (!reify))
943 {
944 ++fdchangecnt;
945 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
946 fdchanges [fdchangecnt - 1] = fd;
947 }
948}
949
950/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
951inline_speed void
952fd_kill (EV_P_ int fd)
953{
954 ev_io *w;
955
956 while ((w = (ev_io *)anfds [fd].head))
957 {
958 ev_io_stop (EV_A_ w);
959 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
960 }
961}
962
963/* check whether the given fd is atcually valid, for error recovery */
964inline_size int
965fd_valid (int fd)
966{
967#ifdef _WIN32
968 return _get_osfhandle (fd) != -1;
969#else
970 return fcntl (fd, F_GETFD) != -1;
971#endif
972}
973
974/* called on EBADF to verify fds */
975static void noinline
976fd_ebadf (EV_P)
977{
978 int fd;
979
980 for (fd = 0; fd < anfdmax; ++fd)
981 if (anfds [fd].events)
982 if (!fd_valid (fd) && errno == EBADF)
983 fd_kill (EV_A_ fd);
984}
985
986/* called on ENOMEM in select/poll to kill some fds and retry */
987static void noinline
988fd_enomem (EV_P)
989{
990 int fd;
991
992 for (fd = anfdmax; fd--; )
993 if (anfds [fd].events)
994 {
995 fd_kill (EV_A_ fd);
996 break;
997 }
998}
999
1000/* usually called after fork if backend needs to re-arm all fds from scratch */
1001static void noinline
1002fd_rearm_all (EV_P)
1003{
1004 int fd;
1005
1006 for (fd = 0; fd < anfdmax; ++fd)
1007 if (anfds [fd].events)
1008 {
1009 anfds [fd].events = 0;
1010 anfds [fd].emask = 0;
1011 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1012 }
1013}
1014
1015/*****************************************************************************/
1016
1017/*
1018 * the heap functions want a real array index. array index 0 uis guaranteed to not
1019 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1020 * the branching factor of the d-tree.
1021 */
1022
1023/*
1024 * at the moment we allow libev the luxury of two heaps,
1025 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1026 * which is more cache-efficient.
1027 * the difference is about 5% with 50000+ watchers.
1028 */
1029#if EV_USE_4HEAP
1030
1031#define DHEAP 4
1032#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1033#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1034#define UPHEAP_DONE(p,k) ((p) == (k))
1035
1036/* away from the root */
1037inline_speed void
1038downheap (ANHE *heap, int N, int k)
1039{
1040 ANHE he = heap [k];
1041 ANHE *E = heap + N + HEAP0;
1042
1043 for (;;)
1044 {
1045 ev_tstamp minat;
1046 ANHE *minpos;
1047 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1048
1049 /* find minimum child */
1050 if (expect_true (pos + DHEAP - 1 < E))
1051 {
1052 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1053 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1054 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1055 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1056 }
1057 else if (pos < E)
1058 {
1059 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1060 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1061 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1062 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1063 }
1064 else
1065 break;
1066
1067 if (ANHE_at (he) <= minat)
1068 break;
1069
1070 heap [k] = *minpos;
1071 ev_active (ANHE_w (*minpos)) = k;
1072
1073 k = minpos - heap;
1074 }
1075
1076 heap [k] = he;
1077 ev_active (ANHE_w (he)) = k;
1078}
1079
1080#else /* 4HEAP */
1081
1082#define HEAP0 1
1083#define HPARENT(k) ((k) >> 1)
1084#define UPHEAP_DONE(p,k) (!(p))
1085
1086/* away from the root */
1087inline_speed void
1088downheap (ANHE *heap, int N, int k)
1089{
1090 ANHE he = heap [k];
1091
1092 for (;;)
1093 {
1094 int c = k << 1;
1095
1096 if (c >= N + HEAP0)
1097 break;
1098
1099 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1100 ? 1 : 0;
1101
1102 if (ANHE_at (he) <= ANHE_at (heap [c]))
1103 break;
1104
1105 heap [k] = heap [c];
1106 ev_active (ANHE_w (heap [k])) = k;
1107
1108 k = c;
1109 }
1110
1111 heap [k] = he;
1112 ev_active (ANHE_w (he)) = k;
1113}
1114#endif
1115
1116/* towards the root */
1117inline_speed void
1118upheap (ANHE *heap, int k)
1119{
1120 ANHE he = heap [k];
1121
1122 for (;;)
1123 {
1124 int p = HPARENT (k);
1125
1126 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1127 break;
1128
1129 heap [k] = heap [p];
1130 ev_active (ANHE_w (heap [k])) = k;
1131 k = p;
1132 }
1133
1134 heap [k] = he;
1135 ev_active (ANHE_w (he)) = k;
1136}
1137
1138/* move an element suitably so it is in a correct place */
1139inline_size void
1140adjustheap (ANHE *heap, int N, int k)
1141{
1142 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1143 upheap (heap, k);
1144 else
1145 downheap (heap, N, k);
1146}
1147
1148/* rebuild the heap: this function is used only once and executed rarely */
1149inline_size void
1150reheap (ANHE *heap, int N)
1151{
1152 int i;
1153
1154 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1155 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1156 for (i = 0; i < N; ++i)
1157 upheap (heap, i + HEAP0);
1158}
1159
1160/*****************************************************************************/
1161
1162/* associate signal watchers to a signal signal */
1163typedef struct
1164{
1165 EV_ATOMIC_T pending;
1166#if EV_MULTIPLICITY
1167 EV_P;
1168#endif
1169 WL head;
1170} ANSIG;
1171
1172static ANSIG signals [EV_NSIG - 1];
1173
1174/*****************************************************************************/
1175
1176/* used to prepare libev internal fd's */
1177/* this is not fork-safe */
1178inline_speed void
1179fd_intern (int fd)
1180{
1181#ifdef _WIN32
1182 unsigned long arg = 1;
1183 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
1184#else
1185 fcntl (fd, F_SETFD, FD_CLOEXEC);
1186 fcntl (fd, F_SETFL, O_NONBLOCK);
1187#endif
1188}
1189
1190static void noinline
1191evpipe_init (EV_P)
1192{
1193 if (!ev_is_active (&pipe_w))
1194 {
1195#if EV_USE_EVENTFD
1196 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1197 if (evfd < 0 && errno == EINVAL)
1198 evfd = eventfd (0, 0);
1199
1200 if (evfd >= 0)
1201 {
1202 evpipe [0] = -1;
1203 fd_intern (evfd); /* doing it twice doesn't hurt */
1204 ev_io_set (&pipe_w, evfd, EV_READ);
1205 }
1206 else
1207#endif
1208 {
1209 while (pipe (evpipe))
1210 ev_syserr ("(libev) error creating signal/async pipe");
1211
1212 fd_intern (evpipe [0]);
1213 fd_intern (evpipe [1]);
1214 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1215 }
1216
1217 ev_io_start (EV_A_ &pipe_w);
1218 ev_unref (EV_A); /* watcher should not keep loop alive */
1219 }
1220}
1221
1222inline_size void
1223evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1224{
1225 if (!*flag)
1226 {
1227 int old_errno = errno; /* save errno because write might clobber it */
1228
1229 *flag = 1;
1230
1231#if EV_USE_EVENTFD
1232 if (evfd >= 0)
1233 {
1234 uint64_t counter = 1;
1235 write (evfd, &counter, sizeof (uint64_t));
1236 }
1237 else
1238#endif
1239 write (evpipe [1], &old_errno, 1);
1240
1241 errno = old_errno;
1242 }
1243}
1244
1245/* called whenever the libev signal pipe */
1246/* got some events (signal, async) */
432static void 1247static void
433call_pending () 1248pipecb (EV_P_ ev_io *iow, int revents)
434{ 1249{
435 while (pendingcnt) 1250 int i;
1251
1252#if EV_USE_EVENTFD
1253 if (evfd >= 0)
1254 {
1255 uint64_t counter;
1256 read (evfd, &counter, sizeof (uint64_t));
436 { 1257 }
437 ANPENDING *p = pendings + --pendingcnt; 1258 else
1259#endif
1260 {
1261 char dummy;
1262 read (evpipe [0], &dummy, 1);
1263 }
438 1264
439 if (p->w) 1265 if (sig_pending)
1266 {
1267 sig_pending = 0;
1268
1269 for (i = EV_NSIG - 1; i--; )
1270 if (expect_false (signals [i].pending))
1271 ev_feed_signal_event (EV_A_ i + 1);
1272 }
1273
1274#if EV_ASYNC_ENABLE
1275 if (async_pending)
1276 {
1277 async_pending = 0;
1278
1279 for (i = asynccnt; i--; )
1280 if (asyncs [i]->sent)
1281 {
1282 asyncs [i]->sent = 0;
1283 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1284 }
1285 }
1286#endif
1287}
1288
1289/*****************************************************************************/
1290
1291static void
1292ev_sighandler (int signum)
1293{
1294#if EV_MULTIPLICITY
1295 EV_P = signals [signum - 1].loop;
1296#endif
1297
1298#if _WIN32
1299 signal (signum, ev_sighandler);
1300#endif
1301
1302 signals [signum - 1].pending = 1;
1303 evpipe_write (EV_A_ &sig_pending);
1304}
1305
1306void noinline
1307ev_feed_signal_event (EV_P_ int signum)
1308{
1309 WL w;
1310
1311 if (expect_false (signum <= 0 || signum > EV_NSIG))
1312 return;
1313
1314 --signum;
1315
1316#if EV_MULTIPLICITY
1317 /* it is permissible to try to feed a signal to the wrong loop */
1318 /* or, likely more useful, feeding a signal nobody is waiting for */
1319
1320 if (expect_false (signals [signum].loop != EV_A))
1321 return;
1322#endif
1323
1324 signals [signum].pending = 0;
1325
1326 for (w = signals [signum].head; w; w = w->next)
1327 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1328}
1329
1330#if EV_USE_SIGNALFD
1331static void
1332sigfdcb (EV_P_ ev_io *iow, int revents)
1333{
1334 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1335
1336 for (;;)
1337 {
1338 ssize_t res = read (sigfd, si, sizeof (si));
1339
1340 /* not ISO-C, as res might be -1, but works with SuS */
1341 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1342 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1343
1344 if (res < (ssize_t)sizeof (si))
1345 break;
1346 }
1347}
1348#endif
1349
1350/*****************************************************************************/
1351
1352static WL childs [EV_PID_HASHSIZE];
1353
1354#ifndef _WIN32
1355
1356static ev_signal childev;
1357
1358#ifndef WIFCONTINUED
1359# define WIFCONTINUED(status) 0
1360#endif
1361
1362/* handle a single child status event */
1363inline_speed void
1364child_reap (EV_P_ int chain, int pid, int status)
1365{
1366 ev_child *w;
1367 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1368
1369 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1370 {
1371 if ((w->pid == pid || !w->pid)
1372 && (!traced || (w->flags & 1)))
440 { 1373 {
441 p->w->pending = 0; 1374 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
442 p->w->cb (p->w, p->events); 1375 w->rpid = pid;
1376 w->rstatus = status;
1377 ev_feed_event (EV_A_ (W)w, EV_CHILD);
443 } 1378 }
444 } 1379 }
445} 1380}
446 1381
1382#ifndef WCONTINUED
1383# define WCONTINUED 0
1384#endif
1385
1386/* called on sigchld etc., calls waitpid */
447static void 1387static void
1388childcb (EV_P_ ev_signal *sw, int revents)
1389{
1390 int pid, status;
1391
1392 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1393 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1394 if (!WCONTINUED
1395 || errno != EINVAL
1396 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1397 return;
1398
1399 /* make sure we are called again until all children have been reaped */
1400 /* we need to do it this way so that the callback gets called before we continue */
1401 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1402
1403 child_reap (EV_A_ pid, pid, status);
1404 if (EV_PID_HASHSIZE > 1)
1405 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1406}
1407
1408#endif
1409
1410/*****************************************************************************/
1411
1412#if EV_USE_PORT
1413# include "ev_port.c"
1414#endif
1415#if EV_USE_KQUEUE
1416# include "ev_kqueue.c"
1417#endif
1418#if EV_USE_EPOLL
1419# include "ev_epoll.c"
1420#endif
1421#if EV_USE_POLL
1422# include "ev_poll.c"
1423#endif
1424#if EV_USE_SELECT
1425# include "ev_select.c"
1426#endif
1427
1428int
1429ev_version_major (void)
1430{
1431 return EV_VERSION_MAJOR;
1432}
1433
1434int
1435ev_version_minor (void)
1436{
1437 return EV_VERSION_MINOR;
1438}
1439
1440/* return true if we are running with elevated privileges and should ignore env variables */
1441int inline_size
1442enable_secure (void)
1443{
1444#ifdef _WIN32
1445 return 0;
1446#else
1447 return getuid () != geteuid ()
1448 || getgid () != getegid ();
1449#endif
1450}
1451
1452unsigned int
1453ev_supported_backends (void)
1454{
1455 unsigned int flags = 0;
1456
1457 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1458 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1459 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1460 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1461 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1462
1463 return flags;
1464}
1465
1466unsigned int
1467ev_recommended_backends (void)
1468{
1469 unsigned int flags = ev_supported_backends ();
1470
1471#ifndef __NetBSD__
1472 /* kqueue is borked on everything but netbsd apparently */
1473 /* it usually doesn't work correctly on anything but sockets and pipes */
1474 flags &= ~EVBACKEND_KQUEUE;
1475#endif
1476#ifdef __APPLE__
1477 /* only select works correctly on that "unix-certified" platform */
1478 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1479 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1480#endif
1481
1482 return flags;
1483}
1484
1485unsigned int
1486ev_embeddable_backends (void)
1487{
1488 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1489
1490 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1491 /* please fix it and tell me how to detect the fix */
1492 flags &= ~EVBACKEND_EPOLL;
1493
1494 return flags;
1495}
1496
1497unsigned int
1498ev_backend (EV_P)
1499{
1500 return backend;
1501}
1502
1503#if EV_MINIMAL < 2
1504unsigned int
1505ev_loop_count (EV_P)
1506{
1507 return loop_count;
1508}
1509
1510unsigned int
1511ev_loop_depth (EV_P)
1512{
1513 return loop_depth;
1514}
1515
1516void
1517ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1518{
1519 io_blocktime = interval;
1520}
1521
1522void
1523ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1524{
1525 timeout_blocktime = interval;
1526}
1527
1528void
1529ev_set_userdata (EV_P_ void *data)
1530{
1531 userdata = data;
1532}
1533
1534void *
1535ev_userdata (EV_P)
1536{
1537 return userdata;
1538}
1539
1540void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1541{
1542 invoke_cb = invoke_pending_cb;
1543}
1544
1545void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1546{
1547 release_cb = release;
1548 acquire_cb = acquire;
1549}
1550#endif
1551
1552/* initialise a loop structure, must be zero-initialised */
1553static void noinline
1554loop_init (EV_P_ unsigned int flags)
1555{
1556 if (!backend)
1557 {
1558#if EV_USE_REALTIME
1559 if (!have_realtime)
1560 {
1561 struct timespec ts;
1562
1563 if (!clock_gettime (CLOCK_REALTIME, &ts))
1564 have_realtime = 1;
1565 }
1566#endif
1567
1568#if EV_USE_MONOTONIC
1569 if (!have_monotonic)
1570 {
1571 struct timespec ts;
1572
1573 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1574 have_monotonic = 1;
1575 }
1576#endif
1577
1578 /* pid check not overridable via env */
1579#ifndef _WIN32
1580 if (flags & EVFLAG_FORKCHECK)
1581 curpid = getpid ();
1582#endif
1583
1584 if (!(flags & EVFLAG_NOENV)
1585 && !enable_secure ()
1586 && getenv ("LIBEV_FLAGS"))
1587 flags = atoi (getenv ("LIBEV_FLAGS"));
1588
1589 ev_rt_now = ev_time ();
1590 mn_now = get_clock ();
1591 now_floor = mn_now;
1592 rtmn_diff = ev_rt_now - mn_now;
1593#if EV_MINIMAL < 2
1594 invoke_cb = ev_invoke_pending;
1595#endif
1596
1597 io_blocktime = 0.;
1598 timeout_blocktime = 0.;
1599 backend = 0;
1600 backend_fd = -1;
1601 sig_pending = 0;
1602#if EV_ASYNC_ENABLE
1603 async_pending = 0;
1604#endif
1605#if EV_USE_INOTIFY
1606 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1607#endif
1608#if EV_USE_SIGNALFD
1609 sigfd = flags & EVFLAG_NOSIGFD ? -1 : -2;
1610#endif
1611
1612 if (!(flags & 0x0000ffffU))
1613 flags |= ev_recommended_backends ();
1614
1615#if EV_USE_PORT
1616 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1617#endif
1618#if EV_USE_KQUEUE
1619 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1620#endif
1621#if EV_USE_EPOLL
1622 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1623#endif
1624#if EV_USE_POLL
1625 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1626#endif
1627#if EV_USE_SELECT
1628 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1629#endif
1630
1631 ev_prepare_init (&pending_w, pendingcb);
1632
1633 ev_init (&pipe_w, pipecb);
1634 ev_set_priority (&pipe_w, EV_MAXPRI);
1635 }
1636}
1637
1638/* free up a loop structure */
1639static void noinline
1640loop_destroy (EV_P)
1641{
1642 int i;
1643
1644 if (ev_is_active (&pipe_w))
1645 {
1646 /*ev_ref (EV_A);*/
1647 /*ev_io_stop (EV_A_ &pipe_w);*/
1648
1649#if EV_USE_EVENTFD
1650 if (evfd >= 0)
1651 close (evfd);
1652#endif
1653
1654 if (evpipe [0] >= 0)
1655 {
1656 EV_WIN32_CLOSE_FD (evpipe [0]);
1657 EV_WIN32_CLOSE_FD (evpipe [1]);
1658 }
1659 }
1660
1661#if EV_USE_SIGNALFD
1662 if (ev_is_active (&sigfd_w))
1663 {
1664 /*ev_ref (EV_A);*/
1665 /*ev_io_stop (EV_A_ &sigfd_w);*/
1666
1667 close (sigfd);
1668 }
1669#endif
1670
1671#if EV_USE_INOTIFY
1672 if (fs_fd >= 0)
1673 close (fs_fd);
1674#endif
1675
1676 if (backend_fd >= 0)
1677 close (backend_fd);
1678
1679#if EV_USE_PORT
1680 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1681#endif
1682#if EV_USE_KQUEUE
1683 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1684#endif
1685#if EV_USE_EPOLL
1686 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1687#endif
1688#if EV_USE_POLL
1689 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1690#endif
1691#if EV_USE_SELECT
1692 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1693#endif
1694
1695 for (i = NUMPRI; i--; )
1696 {
1697 array_free (pending, [i]);
1698#if EV_IDLE_ENABLE
1699 array_free (idle, [i]);
1700#endif
1701 }
1702
1703 ev_free (anfds); anfds = 0; anfdmax = 0;
1704
1705 /* have to use the microsoft-never-gets-it-right macro */
1706 array_free (rfeed, EMPTY);
1707 array_free (fdchange, EMPTY);
1708 array_free (timer, EMPTY);
1709#if EV_PERIODIC_ENABLE
1710 array_free (periodic, EMPTY);
1711#endif
1712#if EV_FORK_ENABLE
1713 array_free (fork, EMPTY);
1714#endif
1715 array_free (prepare, EMPTY);
1716 array_free (check, EMPTY);
1717#if EV_ASYNC_ENABLE
1718 array_free (async, EMPTY);
1719#endif
1720
1721 backend = 0;
1722}
1723
1724#if EV_USE_INOTIFY
1725inline_size void infy_fork (EV_P);
1726#endif
1727
1728inline_size void
1729loop_fork (EV_P)
1730{
1731#if EV_USE_PORT
1732 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1733#endif
1734#if EV_USE_KQUEUE
1735 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1736#endif
1737#if EV_USE_EPOLL
1738 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1739#endif
1740#if EV_USE_INOTIFY
1741 infy_fork (EV_A);
1742#endif
1743
1744 if (ev_is_active (&pipe_w))
1745 {
1746 /* this "locks" the handlers against writing to the pipe */
1747 /* while we modify the fd vars */
1748 sig_pending = 1;
1749#if EV_ASYNC_ENABLE
1750 async_pending = 1;
1751#endif
1752
1753 ev_ref (EV_A);
1754 ev_io_stop (EV_A_ &pipe_w);
1755
1756#if EV_USE_EVENTFD
1757 if (evfd >= 0)
1758 close (evfd);
1759#endif
1760
1761 if (evpipe [0] >= 0)
1762 {
1763 EV_WIN32_CLOSE_FD (evpipe [0]);
1764 EV_WIN32_CLOSE_FD (evpipe [1]);
1765 }
1766
1767 evpipe_init (EV_A);
1768 /* now iterate over everything, in case we missed something */
1769 pipecb (EV_A_ &pipe_w, EV_READ);
1770 }
1771
1772 postfork = 0;
1773}
1774
1775#if EV_MULTIPLICITY
1776
1777struct ev_loop *
1778ev_loop_new (unsigned int flags)
1779{
1780 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1781
1782 memset (EV_A, 0, sizeof (struct ev_loop));
1783 loop_init (EV_A_ flags);
1784
1785 if (ev_backend (EV_A))
1786 return EV_A;
1787
1788 return 0;
1789}
1790
1791void
1792ev_loop_destroy (EV_P)
1793{
1794 loop_destroy (EV_A);
1795 ev_free (loop);
1796}
1797
1798void
1799ev_loop_fork (EV_P)
1800{
1801 postfork = 1; /* must be in line with ev_default_fork */
1802}
1803#endif /* multiplicity */
1804
1805#if EV_VERIFY
1806static void noinline
1807verify_watcher (EV_P_ W w)
1808{
1809 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1810
1811 if (w->pending)
1812 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1813}
1814
1815static void noinline
1816verify_heap (EV_P_ ANHE *heap, int N)
1817{
1818 int i;
1819
1820 for (i = HEAP0; i < N + HEAP0; ++i)
1821 {
1822 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1823 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1824 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1825
1826 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1827 }
1828}
1829
1830static void noinline
1831array_verify (EV_P_ W *ws, int cnt)
1832{
1833 while (cnt--)
1834 {
1835 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1836 verify_watcher (EV_A_ ws [cnt]);
1837 }
1838}
1839#endif
1840
1841#if EV_MINIMAL < 2
1842void
1843ev_loop_verify (EV_P)
1844{
1845#if EV_VERIFY
1846 int i;
1847 WL w;
1848
1849 assert (activecnt >= -1);
1850
1851 assert (fdchangemax >= fdchangecnt);
1852 for (i = 0; i < fdchangecnt; ++i)
1853 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1854
1855 assert (anfdmax >= 0);
1856 for (i = 0; i < anfdmax; ++i)
1857 for (w = anfds [i].head; w; w = w->next)
1858 {
1859 verify_watcher (EV_A_ (W)w);
1860 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
1861 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1862 }
1863
1864 assert (timermax >= timercnt);
1865 verify_heap (EV_A_ timers, timercnt);
1866
1867#if EV_PERIODIC_ENABLE
1868 assert (periodicmax >= periodiccnt);
1869 verify_heap (EV_A_ periodics, periodiccnt);
1870#endif
1871
1872 for (i = NUMPRI; i--; )
1873 {
1874 assert (pendingmax [i] >= pendingcnt [i]);
1875#if EV_IDLE_ENABLE
1876 assert (idleall >= 0);
1877 assert (idlemax [i] >= idlecnt [i]);
1878 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1879#endif
1880 }
1881
1882#if EV_FORK_ENABLE
1883 assert (forkmax >= forkcnt);
1884 array_verify (EV_A_ (W *)forks, forkcnt);
1885#endif
1886
1887#if EV_ASYNC_ENABLE
1888 assert (asyncmax >= asynccnt);
1889 array_verify (EV_A_ (W *)asyncs, asynccnt);
1890#endif
1891
1892 assert (preparemax >= preparecnt);
1893 array_verify (EV_A_ (W *)prepares, preparecnt);
1894
1895 assert (checkmax >= checkcnt);
1896 array_verify (EV_A_ (W *)checks, checkcnt);
1897
1898# if 0
1899 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1900 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
1901# endif
1902#endif
1903}
1904#endif
1905
1906#if EV_MULTIPLICITY
1907struct ev_loop *
1908ev_default_loop_init (unsigned int flags)
1909#else
1910int
1911ev_default_loop (unsigned int flags)
1912#endif
1913{
1914 if (!ev_default_loop_ptr)
1915 {
1916#if EV_MULTIPLICITY
1917 EV_P = ev_default_loop_ptr = &default_loop_struct;
1918#else
1919 ev_default_loop_ptr = 1;
1920#endif
1921
1922 loop_init (EV_A_ flags);
1923
1924 if (ev_backend (EV_A))
1925 {
1926#ifndef _WIN32
1927 ev_signal_init (&childev, childcb, SIGCHLD);
1928 ev_set_priority (&childev, EV_MAXPRI);
1929 ev_signal_start (EV_A_ &childev);
1930 ev_unref (EV_A); /* child watcher should not keep loop alive */
1931#endif
1932 }
1933 else
1934 ev_default_loop_ptr = 0;
1935 }
1936
1937 return ev_default_loop_ptr;
1938}
1939
1940void
1941ev_default_destroy (void)
1942{
1943#if EV_MULTIPLICITY
1944 EV_P = ev_default_loop_ptr;
1945#endif
1946
1947 ev_default_loop_ptr = 0;
1948
1949#ifndef _WIN32
1950 ev_ref (EV_A); /* child watcher */
1951 ev_signal_stop (EV_A_ &childev);
1952#endif
1953
1954 loop_destroy (EV_A);
1955}
1956
1957void
1958ev_default_fork (void)
1959{
1960#if EV_MULTIPLICITY
1961 EV_P = ev_default_loop_ptr;
1962#endif
1963
1964 postfork = 1; /* must be in line with ev_loop_fork */
1965}
1966
1967/*****************************************************************************/
1968
1969void
1970ev_invoke (EV_P_ void *w, int revents)
1971{
1972 EV_CB_INVOKE ((W)w, revents);
1973}
1974
1975unsigned int
1976ev_pending_count (EV_P)
1977{
1978 int pri;
1979 unsigned int count = 0;
1980
1981 for (pri = NUMPRI; pri--; )
1982 count += pendingcnt [pri];
1983
1984 return count;
1985}
1986
1987void noinline
1988ev_invoke_pending (EV_P)
1989{
1990 int pri;
1991
1992 for (pri = NUMPRI; pri--; )
1993 while (pendingcnt [pri])
1994 {
1995 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1996
1997 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
1998 /* ^ this is no longer true, as pending_w could be here */
1999
2000 p->w->pending = 0;
2001 EV_CB_INVOKE (p->w, p->events);
2002 EV_FREQUENT_CHECK;
2003 }
2004}
2005
2006#if EV_IDLE_ENABLE
2007/* make idle watchers pending. this handles the "call-idle */
2008/* only when higher priorities are idle" logic */
2009inline_size void
2010idle_reify (EV_P)
2011{
2012 if (expect_false (idleall))
2013 {
2014 int pri;
2015
2016 for (pri = NUMPRI; pri--; )
2017 {
2018 if (pendingcnt [pri])
2019 break;
2020
2021 if (idlecnt [pri])
2022 {
2023 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2024 break;
2025 }
2026 }
2027 }
2028}
2029#endif
2030
2031/* make timers pending */
2032inline_size void
448timers_reify () 2033timers_reify (EV_P)
449{ 2034{
450 while (timercnt && timers [0]->at <= now) 2035 EV_FREQUENT_CHECK;
451 {
452 struct ev_timer *w = timers [0];
453 2036
454 event ((W)w, EV_TIMEOUT); 2037 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2038 {
2039 do
2040 {
2041 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
455 2042
2043 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2044
456 /* first reschedule or stop timer */ 2045 /* first reschedule or stop timer */
2046 if (w->repeat)
2047 {
2048 ev_at (w) += w->repeat;
2049 if (ev_at (w) < mn_now)
2050 ev_at (w) = mn_now;
2051
2052 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2053
2054 ANHE_at_cache (timers [HEAP0]);
2055 downheap (timers, timercnt, HEAP0);
2056 }
2057 else
2058 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2059
2060 EV_FREQUENT_CHECK;
2061 feed_reverse (EV_A_ (W)w);
2062 }
2063 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2064
2065 feed_reverse_done (EV_A_ EV_TIMEOUT);
2066 }
2067}
2068
2069#if EV_PERIODIC_ENABLE
2070/* make periodics pending */
2071inline_size void
2072periodics_reify (EV_P)
2073{
2074 EV_FREQUENT_CHECK;
2075
2076 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2077 {
2078 int feed_count = 0;
2079
2080 do
2081 {
2082 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2083
2084 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2085
2086 /* first reschedule or stop timer */
2087 if (w->reschedule_cb)
2088 {
2089 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2090
2091 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2092
2093 ANHE_at_cache (periodics [HEAP0]);
2094 downheap (periodics, periodiccnt, HEAP0);
2095 }
2096 else if (w->interval)
2097 {
2098 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2099 /* if next trigger time is not sufficiently in the future, put it there */
2100 /* this might happen because of floating point inexactness */
2101 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2102 {
2103 ev_at (w) += w->interval;
2104
2105 /* if interval is unreasonably low we might still have a time in the past */
2106 /* so correct this. this will make the periodic very inexact, but the user */
2107 /* has effectively asked to get triggered more often than possible */
2108 if (ev_at (w) < ev_rt_now)
2109 ev_at (w) = ev_rt_now;
2110 }
2111
2112 ANHE_at_cache (periodics [HEAP0]);
2113 downheap (periodics, periodiccnt, HEAP0);
2114 }
2115 else
2116 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2117
2118 EV_FREQUENT_CHECK;
2119 feed_reverse (EV_A_ (W)w);
2120 }
2121 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2122
2123 feed_reverse_done (EV_A_ EV_PERIODIC);
2124 }
2125}
2126
2127/* simply recalculate all periodics */
2128/* TODO: maybe ensure that at leats one event happens when jumping forward? */
2129static void noinline
2130periodics_reschedule (EV_P)
2131{
2132 int i;
2133
2134 /* adjust periodics after time jump */
2135 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2136 {
2137 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2138
2139 if (w->reschedule_cb)
2140 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2141 else if (w->interval)
2142 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2143
2144 ANHE_at_cache (periodics [i]);
2145 }
2146
2147 reheap (periodics, periodiccnt);
2148}
2149#endif
2150
2151/* adjust all timers by a given offset */
2152static void noinline
2153timers_reschedule (EV_P_ ev_tstamp adjust)
2154{
2155 int i;
2156
2157 for (i = 0; i < timercnt; ++i)
2158 {
2159 ANHE *he = timers + i + HEAP0;
2160 ANHE_w (*he)->at += adjust;
2161 ANHE_at_cache (*he);
2162 }
2163}
2164
2165/* fetch new monotonic and realtime times from the kernel */
2166/* also detetc if there was a timejump, and act accordingly */
2167inline_speed void
2168time_update (EV_P_ ev_tstamp max_block)
2169{
2170#if EV_USE_MONOTONIC
2171 if (expect_true (have_monotonic))
2172 {
2173 int i;
2174 ev_tstamp odiff = rtmn_diff;
2175
2176 mn_now = get_clock ();
2177
2178 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2179 /* interpolate in the meantime */
2180 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2181 {
2182 ev_rt_now = rtmn_diff + mn_now;
2183 return;
2184 }
2185
2186 now_floor = mn_now;
2187 ev_rt_now = ev_time ();
2188
2189 /* loop a few times, before making important decisions.
2190 * on the choice of "4": one iteration isn't enough,
2191 * in case we get preempted during the calls to
2192 * ev_time and get_clock. a second call is almost guaranteed
2193 * to succeed in that case, though. and looping a few more times
2194 * doesn't hurt either as we only do this on time-jumps or
2195 * in the unlikely event of having been preempted here.
2196 */
2197 for (i = 4; --i; )
2198 {
2199 rtmn_diff = ev_rt_now - mn_now;
2200
2201 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2202 return; /* all is well */
2203
2204 ev_rt_now = ev_time ();
2205 mn_now = get_clock ();
2206 now_floor = mn_now;
2207 }
2208
2209 /* no timer adjustment, as the monotonic clock doesn't jump */
2210 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2211# if EV_PERIODIC_ENABLE
2212 periodics_reschedule (EV_A);
2213# endif
2214 }
2215 else
2216#endif
2217 {
2218 ev_rt_now = ev_time ();
2219
2220 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2221 {
2222 /* adjust timers. this is easy, as the offset is the same for all of them */
2223 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2224#if EV_PERIODIC_ENABLE
2225 periodics_reschedule (EV_A);
2226#endif
2227 }
2228
2229 mn_now = ev_rt_now;
2230 }
2231}
2232
2233void
2234ev_loop (EV_P_ int flags)
2235{
2236#if EV_MINIMAL < 2
2237 ++loop_depth;
2238#endif
2239
2240 assert (("libev: ev_loop recursion during release detected", loop_done != EVUNLOOP_RECURSE));
2241
2242 loop_done = EVUNLOOP_CANCEL;
2243
2244 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2245
2246 do
2247 {
2248#if EV_VERIFY >= 2
2249 ev_loop_verify (EV_A);
2250#endif
2251
2252#ifndef _WIN32
2253 if (expect_false (curpid)) /* penalise the forking check even more */
2254 if (expect_false (getpid () != curpid))
2255 {
2256 curpid = getpid ();
2257 postfork = 1;
2258 }
2259#endif
2260
2261#if EV_FORK_ENABLE
2262 /* we might have forked, so queue fork handlers */
2263 if (expect_false (postfork))
2264 if (forkcnt)
2265 {
2266 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2267 EV_INVOKE_PENDING;
2268 }
2269#endif
2270
2271 /* queue prepare watchers (and execute them) */
2272 if (expect_false (preparecnt))
2273 {
2274 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2275 EV_INVOKE_PENDING;
2276 }
2277
2278 if (expect_false (loop_done))
2279 break;
2280
2281 /* we might have forked, so reify kernel state if necessary */
2282 if (expect_false (postfork))
2283 loop_fork (EV_A);
2284
2285 /* update fd-related kernel structures */
2286 fd_reify (EV_A);
2287
2288 /* calculate blocking time */
2289 {
2290 ev_tstamp waittime = 0.;
2291 ev_tstamp sleeptime = 0.;
2292
2293 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
2294 {
2295 /* remember old timestamp for io_blocktime calculation */
2296 ev_tstamp prev_mn_now = mn_now;
2297
2298 /* update time to cancel out callback processing overhead */
2299 time_update (EV_A_ 1e100);
2300
2301 waittime = MAX_BLOCKTIME;
2302
2303 if (timercnt)
2304 {
2305 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2306 if (waittime > to) waittime = to;
2307 }
2308
2309#if EV_PERIODIC_ENABLE
2310 if (periodiccnt)
2311 {
2312 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2313 if (waittime > to) waittime = to;
2314 }
2315#endif
2316
2317 /* don't let timeouts decrease the waittime below timeout_blocktime */
2318 if (expect_false (waittime < timeout_blocktime))
2319 waittime = timeout_blocktime;
2320
2321 /* extra check because io_blocktime is commonly 0 */
2322 if (expect_false (io_blocktime))
2323 {
2324 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2325
2326 if (sleeptime > waittime - backend_fudge)
2327 sleeptime = waittime - backend_fudge;
2328
2329 if (expect_true (sleeptime > 0.))
2330 {
2331 ev_sleep (sleeptime);
2332 waittime -= sleeptime;
2333 }
2334 }
2335 }
2336
2337#if EV_MINIMAL < 2
2338 ++loop_count;
2339#endif
2340 assert ((loop_done = EVUNLOOP_RECURSE, 1)); /* assert for side effect */
2341 backend_poll (EV_A_ waittime);
2342 assert ((loop_done = EVUNLOOP_CANCEL, 1)); /* assert for side effect */
2343
2344 /* update ev_rt_now, do magic */
2345 time_update (EV_A_ waittime + sleeptime);
2346 }
2347
2348 /* queue pending timers and reschedule them */
2349 timers_reify (EV_A); /* relative timers called last */
2350#if EV_PERIODIC_ENABLE
2351 periodics_reify (EV_A); /* absolute timers called first */
2352#endif
2353
2354#if EV_IDLE_ENABLE
2355 /* queue idle watchers unless other events are pending */
2356 idle_reify (EV_A);
2357#endif
2358
2359 /* queue check watchers, to be executed first */
2360 if (expect_false (checkcnt))
2361 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2362
2363 EV_INVOKE_PENDING;
2364 }
2365 while (expect_true (
2366 activecnt
2367 && !loop_done
2368 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2369 ));
2370
2371 if (loop_done == EVUNLOOP_ONE)
2372 loop_done = EVUNLOOP_CANCEL;
2373
2374#if EV_MINIMAL < 2
2375 --loop_depth;
2376#endif
2377}
2378
2379void
2380ev_unloop (EV_P_ int how)
2381{
2382 loop_done = how;
2383}
2384
2385void
2386ev_ref (EV_P)
2387{
2388 ++activecnt;
2389}
2390
2391void
2392ev_unref (EV_P)
2393{
2394 --activecnt;
2395}
2396
2397void
2398ev_now_update (EV_P)
2399{
2400 time_update (EV_A_ 1e100);
2401}
2402
2403void
2404ev_suspend (EV_P)
2405{
2406 ev_now_update (EV_A);
2407}
2408
2409void
2410ev_resume (EV_P)
2411{
2412 ev_tstamp mn_prev = mn_now;
2413
2414 ev_now_update (EV_A);
2415 timers_reschedule (EV_A_ mn_now - mn_prev);
2416#if EV_PERIODIC_ENABLE
2417 /* TODO: really do this? */
2418 periodics_reschedule (EV_A);
2419#endif
2420}
2421
2422/*****************************************************************************/
2423/* singly-linked list management, used when the expected list length is short */
2424
2425inline_size void
2426wlist_add (WL *head, WL elem)
2427{
2428 elem->next = *head;
2429 *head = elem;
2430}
2431
2432inline_size void
2433wlist_del (WL *head, WL elem)
2434{
2435 while (*head)
2436 {
2437 if (expect_true (*head == elem))
2438 {
2439 *head = elem->next;
2440 break;
2441 }
2442
2443 head = &(*head)->next;
2444 }
2445}
2446
2447/* internal, faster, version of ev_clear_pending */
2448inline_speed void
2449clear_pending (EV_P_ W w)
2450{
2451 if (w->pending)
2452 {
2453 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2454 w->pending = 0;
2455 }
2456}
2457
2458int
2459ev_clear_pending (EV_P_ void *w)
2460{
2461 W w_ = (W)w;
2462 int pending = w_->pending;
2463
2464 if (expect_true (pending))
2465 {
2466 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2467 p->w = (W)&pending_w;
2468 w_->pending = 0;
2469 return p->events;
2470 }
2471 else
2472 return 0;
2473}
2474
2475inline_size void
2476pri_adjust (EV_P_ W w)
2477{
2478 int pri = ev_priority (w);
2479 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2480 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2481 ev_set_priority (w, pri);
2482}
2483
2484inline_speed void
2485ev_start (EV_P_ W w, int active)
2486{
2487 pri_adjust (EV_A_ w);
2488 w->active = active;
2489 ev_ref (EV_A);
2490}
2491
2492inline_size void
2493ev_stop (EV_P_ W w)
2494{
2495 ev_unref (EV_A);
2496 w->active = 0;
2497}
2498
2499/*****************************************************************************/
2500
2501void noinline
2502ev_io_start (EV_P_ ev_io *w)
2503{
2504 int fd = w->fd;
2505
2506 if (expect_false (ev_is_active (w)))
2507 return;
2508
2509 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2510 assert (("libev: ev_io start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2511
2512 EV_FREQUENT_CHECK;
2513
2514 ev_start (EV_A_ (W)w, 1);
2515 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2516 wlist_add (&anfds[fd].head, (WL)w);
2517
2518 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2519 w->events &= ~EV__IOFDSET;
2520
2521 EV_FREQUENT_CHECK;
2522}
2523
2524void noinline
2525ev_io_stop (EV_P_ ev_io *w)
2526{
2527 clear_pending (EV_A_ (W)w);
2528 if (expect_false (!ev_is_active (w)))
2529 return;
2530
2531 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2532
2533 EV_FREQUENT_CHECK;
2534
2535 wlist_del (&anfds[w->fd].head, (WL)w);
2536 ev_stop (EV_A_ (W)w);
2537
2538 fd_change (EV_A_ w->fd, 1);
2539
2540 EV_FREQUENT_CHECK;
2541}
2542
2543void noinline
2544ev_timer_start (EV_P_ ev_timer *w)
2545{
2546 if (expect_false (ev_is_active (w)))
2547 return;
2548
2549 ev_at (w) += mn_now;
2550
2551 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2552
2553 EV_FREQUENT_CHECK;
2554
2555 ++timercnt;
2556 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2557 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2558 ANHE_w (timers [ev_active (w)]) = (WT)w;
2559 ANHE_at_cache (timers [ev_active (w)]);
2560 upheap (timers, ev_active (w));
2561
2562 EV_FREQUENT_CHECK;
2563
2564 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2565}
2566
2567void noinline
2568ev_timer_stop (EV_P_ ev_timer *w)
2569{
2570 clear_pending (EV_A_ (W)w);
2571 if (expect_false (!ev_is_active (w)))
2572 return;
2573
2574 EV_FREQUENT_CHECK;
2575
2576 {
2577 int active = ev_active (w);
2578
2579 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2580
2581 --timercnt;
2582
2583 if (expect_true (active < timercnt + HEAP0))
2584 {
2585 timers [active] = timers [timercnt + HEAP0];
2586 adjustheap (timers, timercnt, active);
2587 }
2588 }
2589
2590 EV_FREQUENT_CHECK;
2591
2592 ev_at (w) -= mn_now;
2593
2594 ev_stop (EV_A_ (W)w);
2595}
2596
2597void noinline
2598ev_timer_again (EV_P_ ev_timer *w)
2599{
2600 EV_FREQUENT_CHECK;
2601
2602 if (ev_is_active (w))
2603 {
457 if (w->repeat) 2604 if (w->repeat)
458 { 2605 {
459 w->at = now + w->repeat; 2606 ev_at (w) = mn_now + w->repeat;
460 assert (("timer timeout in the past, negative repeat?", w->at > now)); 2607 ANHE_at_cache (timers [ev_active (w)]);
461 downheap ((WT *)timers, timercnt, 0); 2608 adjustheap (timers, timercnt, ev_active (w));
462 } 2609 }
463 else 2610 else
464 evtimer_stop (w); /* nonrepeating: stop timer */ 2611 ev_timer_stop (EV_A_ w);
465 }
466}
467
468static void
469periodics_reify ()
470{
471 while (periodiccnt && periodics [0]->at <= ev_now)
472 { 2612 }
473 struct ev_periodic *w = periodics [0]; 2613 else if (w->repeat)
2614 {
2615 ev_at (w) = w->repeat;
2616 ev_timer_start (EV_A_ w);
2617 }
474 2618
475 /* first reschedule or stop timer */ 2619 EV_FREQUENT_CHECK;
2620}
2621
2622ev_tstamp
2623ev_timer_remaining (EV_P_ ev_timer *w)
2624{
2625 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2626}
2627
2628#if EV_PERIODIC_ENABLE
2629void noinline
2630ev_periodic_start (EV_P_ ev_periodic *w)
2631{
2632 if (expect_false (ev_is_active (w)))
2633 return;
2634
2635 if (w->reschedule_cb)
2636 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
476 if (w->interval) 2637 else if (w->interval)
2638 {
2639 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2640 /* this formula differs from the one in periodic_reify because we do not always round up */
2641 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2642 }
2643 else
2644 ev_at (w) = w->offset;
2645
2646 EV_FREQUENT_CHECK;
2647
2648 ++periodiccnt;
2649 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2650 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2651 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2652 ANHE_at_cache (periodics [ev_active (w)]);
2653 upheap (periodics, ev_active (w));
2654
2655 EV_FREQUENT_CHECK;
2656
2657 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2658}
2659
2660void noinline
2661ev_periodic_stop (EV_P_ ev_periodic *w)
2662{
2663 clear_pending (EV_A_ (W)w);
2664 if (expect_false (!ev_is_active (w)))
2665 return;
2666
2667 EV_FREQUENT_CHECK;
2668
2669 {
2670 int active = ev_active (w);
2671
2672 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2673
2674 --periodiccnt;
2675
2676 if (expect_true (active < periodiccnt + HEAP0))
2677 {
2678 periodics [active] = periodics [periodiccnt + HEAP0];
2679 adjustheap (periodics, periodiccnt, active);
2680 }
2681 }
2682
2683 EV_FREQUENT_CHECK;
2684
2685 ev_stop (EV_A_ (W)w);
2686}
2687
2688void noinline
2689ev_periodic_again (EV_P_ ev_periodic *w)
2690{
2691 /* TODO: use adjustheap and recalculation */
2692 ev_periodic_stop (EV_A_ w);
2693 ev_periodic_start (EV_A_ w);
2694}
2695#endif
2696
2697#ifndef SA_RESTART
2698# define SA_RESTART 0
2699#endif
2700
2701void noinline
2702ev_signal_start (EV_P_ ev_signal *w)
2703{
2704 if (expect_false (ev_is_active (w)))
2705 return;
2706
2707 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2708
2709#if EV_MULTIPLICITY
2710 assert (("libev: a signal must not be attached to two different loops",
2711 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2712
2713 signals [w->signum - 1].loop = EV_A;
2714#endif
2715
2716 EV_FREQUENT_CHECK;
2717
2718#if EV_USE_SIGNALFD
2719 if (sigfd == -2)
2720 {
2721 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2722 if (sigfd < 0 && errno == EINVAL)
2723 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2724
2725 if (sigfd >= 0)
477 { 2726 {
478 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 2727 fd_intern (sigfd); /* doing it twice will not hurt */
479 assert (("periodic timeout in the past, negative interval?", w->at > ev_now)); 2728
480 downheap ((WT *)periodics, periodiccnt, 0); 2729 sigemptyset (&sigfd_set);
2730
2731 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2732 ev_set_priority (&sigfd_w, EV_MAXPRI);
2733 ev_io_start (EV_A_ &sigfd_w);
2734 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2735 }
2736 }
2737
2738 if (sigfd >= 0)
2739 {
2740 /* TODO: check .head */
2741 sigaddset (&sigfd_set, w->signum);
2742 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2743
2744 signalfd (sigfd, &sigfd_set, 0);
2745 }
2746#endif
2747
2748 ev_start (EV_A_ (W)w, 1);
2749 wlist_add (&signals [w->signum - 1].head, (WL)w);
2750
2751 if (!((WL)w)->next)
2752# if EV_USE_SIGNALFD
2753 if (sigfd < 0) /*TODO*/
2754# endif
2755 {
2756# if _WIN32
2757 signal (w->signum, ev_sighandler);
2758# else
2759 struct sigaction sa;
2760
2761 evpipe_init (EV_A);
2762
2763 sa.sa_handler = ev_sighandler;
2764 sigfillset (&sa.sa_mask);
2765 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2766 sigaction (w->signum, &sa, 0);
2767
2768 sigemptyset (&sa.sa_mask);
2769 sigaddset (&sa.sa_mask, w->signum);
2770 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2771#endif
2772 }
2773
2774 EV_FREQUENT_CHECK;
2775}
2776
2777void noinline
2778ev_signal_stop (EV_P_ ev_signal *w)
2779{
2780 clear_pending (EV_A_ (W)w);
2781 if (expect_false (!ev_is_active (w)))
2782 return;
2783
2784 EV_FREQUENT_CHECK;
2785
2786 wlist_del (&signals [w->signum - 1].head, (WL)w);
2787 ev_stop (EV_A_ (W)w);
2788
2789 if (!signals [w->signum - 1].head)
2790 {
2791#if EV_MULTIPLICITY
2792 signals [w->signum - 1].loop = 0; /* unattach from signal */
2793#endif
2794#if EV_USE_SIGNALFD
2795 if (sigfd >= 0)
2796 {
2797 sigprocmask (SIG_UNBLOCK, &sigfd_set, 0);//D
2798 sigdelset (&sigfd_set, w->signum);
2799 signalfd (sigfd, &sigfd_set, 0);
2800 sigprocmask (SIG_BLOCK, &sigfd_set, 0);//D
2801 /*TODO: maybe unblock signal? */
481 } 2802 }
482 else 2803 else
483 evperiodic_stop (w); /* nonrepeating: stop timer */ 2804#endif
484 2805 signal (w->signum, SIG_DFL);
485 event ((W)w, EV_TIMEOUT);
486 }
487}
488
489static void
490periodics_reschedule (ev_tstamp diff)
491{
492 int i;
493
494 /* adjust periodics after time jump */
495 for (i = 0; i < periodiccnt; ++i)
496 { 2806 }
497 struct ev_periodic *w = periodics [i];
498 2807
499 if (w->interval) 2808 EV_FREQUENT_CHECK;
2809}
2810
2811void
2812ev_child_start (EV_P_ ev_child *w)
2813{
2814#if EV_MULTIPLICITY
2815 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2816#endif
2817 if (expect_false (ev_is_active (w)))
2818 return;
2819
2820 EV_FREQUENT_CHECK;
2821
2822 ev_start (EV_A_ (W)w, 1);
2823 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2824
2825 EV_FREQUENT_CHECK;
2826}
2827
2828void
2829ev_child_stop (EV_P_ ev_child *w)
2830{
2831 clear_pending (EV_A_ (W)w);
2832 if (expect_false (!ev_is_active (w)))
2833 return;
2834
2835 EV_FREQUENT_CHECK;
2836
2837 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2838 ev_stop (EV_A_ (W)w);
2839
2840 EV_FREQUENT_CHECK;
2841}
2842
2843#if EV_STAT_ENABLE
2844
2845# ifdef _WIN32
2846# undef lstat
2847# define lstat(a,b) _stati64 (a,b)
2848# endif
2849
2850#define DEF_STAT_INTERVAL 5.0074891
2851#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2852#define MIN_STAT_INTERVAL 0.1074891
2853
2854static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2855
2856#if EV_USE_INOTIFY
2857# define EV_INOTIFY_BUFSIZE 8192
2858
2859static void noinline
2860infy_add (EV_P_ ev_stat *w)
2861{
2862 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);
2863
2864 if (w->wd < 0)
2865 {
2866 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2867 ev_timer_again (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2868
2869 /* monitor some parent directory for speedup hints */
2870 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2871 /* but an efficiency issue only */
2872 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
500 { 2873 {
501 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 2874 char path [4096];
2875 strcpy (path, w->path);
502 2876
503 if (fabs (diff) >= 1e-4) 2877 do
504 { 2878 {
505 evperiodic_stop (w); 2879 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
506 evperiodic_start (w); 2880 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
507 2881
508 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 2882 char *pend = strrchr (path, '/');
2883
2884 if (!pend || pend == path)
2885 break;
2886
2887 *pend = 0;
2888 w->wd = inotify_add_watch (fs_fd, path, mask);
2889 }
2890 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2891 }
2892 }
2893
2894 if (w->wd >= 0)
2895 {
2896 struct statfs sfs;
2897
2898 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2899
2900 /* now local changes will be tracked by inotify, but remote changes won't */
2901 /* unless the filesystem it known to be local, we therefore still poll */
2902 /* also do poll on <2.6.25, but with normal frequency */
2903
2904 if (fs_2625 && !statfs (w->path, &sfs))
2905 if (sfs.f_type == 0x1373 /* devfs */
2906 || sfs.f_type == 0xEF53 /* ext2/3 */
2907 || sfs.f_type == 0x3153464a /* jfs */
2908 || sfs.f_type == 0x52654973 /* reiser3 */
2909 || sfs.f_type == 0x01021994 /* tempfs */
2910 || sfs.f_type == 0x58465342 /* xfs */)
2911 return;
2912
2913 w->timer.repeat = w->interval ? w->interval : fs_2625 ? NFS_STAT_INTERVAL : DEF_STAT_INTERVAL;
2914 ev_timer_again (EV_A_ &w->timer);
2915 }
2916}
2917
2918static void noinline
2919infy_del (EV_P_ ev_stat *w)
2920{
2921 int slot;
2922 int wd = w->wd;
2923
2924 if (wd < 0)
2925 return;
2926
2927 w->wd = -2;
2928 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2929 wlist_del (&fs_hash [slot].head, (WL)w);
2930
2931 /* remove this watcher, if others are watching it, they will rearm */
2932 inotify_rm_watch (fs_fd, wd);
2933}
2934
2935static void noinline
2936infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2937{
2938 if (slot < 0)
2939 /* overflow, need to check for all hash slots */
2940 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2941 infy_wd (EV_A_ slot, wd, ev);
2942 else
2943 {
2944 WL w_;
2945
2946 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2947 {
2948 ev_stat *w = (ev_stat *)w_;
2949 w_ = w_->next; /* lets us remove this watcher and all before it */
2950
2951 if (w->wd == wd || wd == -1)
2952 {
2953 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2954 {
2955 wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2956 w->wd = -1;
2957 infy_add (EV_A_ w); /* re-add, no matter what */
2958 }
2959
2960 stat_timer_cb (EV_A_ &w->timer, 0);
509 } 2961 }
510 } 2962 }
511 } 2963 }
512} 2964}
513 2965
514static void 2966static void
515time_update () 2967infy_cb (EV_P_ ev_io *w, int revents)
516{ 2968{
2969 char buf [EV_INOTIFY_BUFSIZE];
2970 struct inotify_event *ev = (struct inotify_event *)buf;
517 int i; 2971 int ofs;
2972 int len = read (fs_fd, buf, sizeof (buf));
518 2973
519 ev_now = ev_time (); 2974 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2975 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2976}
520 2977
521 if (have_monotonic) 2978inline_size void
2979check_2625 (EV_P)
2980{
2981 /* kernels < 2.6.25 are borked
2982 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
2983 */
2984 struct utsname buf;
2985 int major, minor, micro;
2986
2987 if (uname (&buf))
2988 return;
2989
2990 if (sscanf (buf.release, "%d.%d.%d", &major, &minor, &micro) != 3)
2991 return;
2992
2993 if (major < 2
2994 || (major == 2 && minor < 6)
2995 || (major == 2 && minor == 6 && micro < 25))
2996 return;
2997
2998 fs_2625 = 1;
2999}
3000
3001inline_size int
3002infy_newfd (void)
3003{
3004#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3005 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3006 if (fd >= 0)
3007 return fd;
3008#endif
3009 return inotify_init ();
3010}
3011
3012inline_size void
3013infy_init (EV_P)
3014{
3015 if (fs_fd != -2)
3016 return;
3017
3018 fs_fd = -1;
3019
3020 check_2625 (EV_A);
3021
3022 fs_fd = infy_newfd ();
3023
3024 if (fs_fd >= 0)
3025 {
3026 fd_intern (fs_fd);
3027 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3028 ev_set_priority (&fs_w, EV_MAXPRI);
3029 ev_io_start (EV_A_ &fs_w);
522 { 3030 }
523 ev_tstamp odiff = diff; 3031}
524 3032
525 for (i = 4; --i; ) /* loop a few times, before making important decisions */ 3033inline_size void
3034infy_fork (EV_P)
3035{
3036 int slot;
3037
3038 if (fs_fd < 0)
3039 return;
3040
3041 ev_io_stop (EV_A_ &fs_w);
3042 close (fs_fd);
3043 fs_fd = infy_newfd ();
3044
3045 if (fs_fd >= 0)
3046 {
3047 fd_intern (fs_fd);
3048 ev_io_set (&fs_w, fs_fd, EV_READ);
3049 ev_io_start (EV_A_ &fs_w);
3050 }
3051
3052 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
3053 {
3054 WL w_ = fs_hash [slot].head;
3055 fs_hash [slot].head = 0;
3056
3057 while (w_)
526 { 3058 {
527 now = get_clock (); 3059 ev_stat *w = (ev_stat *)w_;
528 diff = ev_now - now; 3060 w_ = w_->next; /* lets us add this watcher */
529 3061
530 if (fabs (odiff - diff) < MIN_TIMEJUMP) 3062 w->wd = -1;
531 return; /* all is well */
532 3063
533 ev_now = ev_time (); 3064 if (fs_fd >= 0)
3065 infy_add (EV_A_ w); /* re-add, no matter what */
3066 else
3067 ev_timer_again (EV_A_ &w->timer);
534 } 3068 }
535
536 periodics_reschedule (diff - odiff);
537 /* no timer adjustment, as the monotonic clock doesn't jump */
538 } 3069 }
3070}
3071
3072#endif
3073
3074#ifdef _WIN32
3075# define EV_LSTAT(p,b) _stati64 (p, b)
3076#else
3077# define EV_LSTAT(p,b) lstat (p, b)
3078#endif
3079
3080void
3081ev_stat_stat (EV_P_ ev_stat *w)
3082{
3083 if (lstat (w->path, &w->attr) < 0)
3084 w->attr.st_nlink = 0;
3085 else if (!w->attr.st_nlink)
3086 w->attr.st_nlink = 1;
3087}
3088
3089static void noinline
3090stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3091{
3092 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3093
3094 /* we copy this here each the time so that */
3095 /* prev has the old value when the callback gets invoked */
3096 w->prev = w->attr;
3097 ev_stat_stat (EV_A_ w);
3098
3099 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3100 if (
3101 w->prev.st_dev != w->attr.st_dev
3102 || w->prev.st_ino != w->attr.st_ino
3103 || w->prev.st_mode != w->attr.st_mode
3104 || w->prev.st_nlink != w->attr.st_nlink
3105 || w->prev.st_uid != w->attr.st_uid
3106 || w->prev.st_gid != w->attr.st_gid
3107 || w->prev.st_rdev != w->attr.st_rdev
3108 || w->prev.st_size != w->attr.st_size
3109 || w->prev.st_atime != w->attr.st_atime
3110 || w->prev.st_mtime != w->attr.st_mtime
3111 || w->prev.st_ctime != w->attr.st_ctime
3112 ) {
3113 #if EV_USE_INOTIFY
3114 if (fs_fd >= 0)
3115 {
3116 infy_del (EV_A_ w);
3117 infy_add (EV_A_ w);
3118 ev_stat_stat (EV_A_ w); /* avoid race... */
3119 }
3120 #endif
3121
3122 ev_feed_event (EV_A_ w, EV_STAT);
3123 }
3124}
3125
3126void
3127ev_stat_start (EV_P_ ev_stat *w)
3128{
3129 if (expect_false (ev_is_active (w)))
3130 return;
3131
3132 ev_stat_stat (EV_A_ w);
3133
3134 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3135 w->interval = MIN_STAT_INTERVAL;
3136
3137 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3138 ev_set_priority (&w->timer, ev_priority (w));
3139
3140#if EV_USE_INOTIFY
3141 infy_init (EV_A);
3142
3143 if (fs_fd >= 0)
3144 infy_add (EV_A_ w);
539 else 3145 else
3146#endif
3147 ev_timer_again (EV_A_ &w->timer);
3148
3149 ev_start (EV_A_ (W)w, 1);
3150
3151 EV_FREQUENT_CHECK;
3152}
3153
3154void
3155ev_stat_stop (EV_P_ ev_stat *w)
3156{
3157 clear_pending (EV_A_ (W)w);
3158 if (expect_false (!ev_is_active (w)))
3159 return;
3160
3161 EV_FREQUENT_CHECK;
3162
3163#if EV_USE_INOTIFY
3164 infy_del (EV_A_ w);
3165#endif
3166 ev_timer_stop (EV_A_ &w->timer);
3167
3168 ev_stop (EV_A_ (W)w);
3169
3170 EV_FREQUENT_CHECK;
3171}
3172#endif
3173
3174#if EV_IDLE_ENABLE
3175void
3176ev_idle_start (EV_P_ ev_idle *w)
3177{
3178 if (expect_false (ev_is_active (w)))
3179 return;
3180
3181 pri_adjust (EV_A_ (W)w);
3182
3183 EV_FREQUENT_CHECK;
3184
540 { 3185 {
541 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) 3186 int active = ++idlecnt [ABSPRI (w)];
3187
3188 ++idleall;
3189 ev_start (EV_A_ (W)w, active);
3190
3191 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3192 idles [ABSPRI (w)][active - 1] = w;
3193 }
3194
3195 EV_FREQUENT_CHECK;
3196}
3197
3198void
3199ev_idle_stop (EV_P_ ev_idle *w)
3200{
3201 clear_pending (EV_A_ (W)w);
3202 if (expect_false (!ev_is_active (w)))
3203 return;
3204
3205 EV_FREQUENT_CHECK;
3206
3207 {
3208 int active = ev_active (w);
3209
3210 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3211 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3212
3213 ev_stop (EV_A_ (W)w);
3214 --idleall;
3215 }
3216
3217 EV_FREQUENT_CHECK;
3218}
3219#endif
3220
3221void
3222ev_prepare_start (EV_P_ ev_prepare *w)
3223{
3224 if (expect_false (ev_is_active (w)))
3225 return;
3226
3227 EV_FREQUENT_CHECK;
3228
3229 ev_start (EV_A_ (W)w, ++preparecnt);
3230 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3231 prepares [preparecnt - 1] = w;
3232
3233 EV_FREQUENT_CHECK;
3234}
3235
3236void
3237ev_prepare_stop (EV_P_ ev_prepare *w)
3238{
3239 clear_pending (EV_A_ (W)w);
3240 if (expect_false (!ev_is_active (w)))
3241 return;
3242
3243 EV_FREQUENT_CHECK;
3244
3245 {
3246 int active = ev_active (w);
3247
3248 prepares [active - 1] = prepares [--preparecnt];
3249 ev_active (prepares [active - 1]) = active;
3250 }
3251
3252 ev_stop (EV_A_ (W)w);
3253
3254 EV_FREQUENT_CHECK;
3255}
3256
3257void
3258ev_check_start (EV_P_ ev_check *w)
3259{
3260 if (expect_false (ev_is_active (w)))
3261 return;
3262
3263 EV_FREQUENT_CHECK;
3264
3265 ev_start (EV_A_ (W)w, ++checkcnt);
3266 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3267 checks [checkcnt - 1] = w;
3268
3269 EV_FREQUENT_CHECK;
3270}
3271
3272void
3273ev_check_stop (EV_P_ ev_check *w)
3274{
3275 clear_pending (EV_A_ (W)w);
3276 if (expect_false (!ev_is_active (w)))
3277 return;
3278
3279 EV_FREQUENT_CHECK;
3280
3281 {
3282 int active = ev_active (w);
3283
3284 checks [active - 1] = checks [--checkcnt];
3285 ev_active (checks [active - 1]) = active;
3286 }
3287
3288 ev_stop (EV_A_ (W)w);
3289
3290 EV_FREQUENT_CHECK;
3291}
3292
3293#if EV_EMBED_ENABLE
3294void noinline
3295ev_embed_sweep (EV_P_ ev_embed *w)
3296{
3297 ev_loop (w->other, EVLOOP_NONBLOCK);
3298}
3299
3300static void
3301embed_io_cb (EV_P_ ev_io *io, int revents)
3302{
3303 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3304
3305 if (ev_cb (w))
3306 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3307 else
3308 ev_loop (w->other, EVLOOP_NONBLOCK);
3309}
3310
3311static void
3312embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3313{
3314 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3315
3316 {
3317 EV_P = w->other;
3318
3319 while (fdchangecnt)
542 { 3320 {
543 periodics_reschedule (ev_now - now); 3321 fd_reify (EV_A);
544 3322 ev_loop (EV_A_ EVLOOP_NONBLOCK);
545 /* adjust timers. this is easy, as the offset is the same for all */
546 for (i = 0; i < timercnt; ++i)
547 timers [i]->at += diff;
548 } 3323 }
549
550 now = ev_now;
551 } 3324 }
552} 3325}
553 3326
554int ev_loop_done; 3327static void
555 3328embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
556void ev_loop (int flags)
557{ 3329{
558 double block; 3330 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
559 ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;
560 3331
561 do 3332 ev_embed_stop (EV_A_ w);
3333
562 { 3334 {
563 /* queue check watchers (and execute them) */ 3335 EV_P = w->other;
564 if (checkcnt)
565 {
566 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
567 call_pending ();
568 }
569 3336
570 /* update fd-related kernel structures */ 3337 ev_loop_fork (EV_A);
571 fd_reify (); 3338 ev_loop (EV_A_ EVLOOP_NONBLOCK);
572
573 /* calculate blocking time */
574
575 /* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */
576 ev_now = ev_time ();
577
578 if (flags & EVLOOP_NONBLOCK || idlecnt)
579 block = 0.;
580 else
581 {
582 block = MAX_BLOCKTIME;
583
584 if (timercnt)
585 {
586 ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
587 if (block > to) block = to;
588 }
589
590 if (periodiccnt)
591 {
592 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
593 if (block > to) block = to;
594 }
595
596 if (block < 0.) block = 0.;
597 }
598
599 method_poll (block);
600
601 /* update ev_now, do magic */
602 time_update ();
603
604 /* queue pending timers and reschedule them */
605 timers_reify (); /* relative timers called last */
606 periodics_reify (); /* absolute timers called first */
607
608 /* queue idle watchers unless io or timers are pending */
609 if (!pendingcnt)
610 queue_events ((W *)idles, idlecnt, EV_IDLE);
611
612 /* queue check watchers, to be executed first */
613 if (checkcnt)
614 queue_events ((W *)checks, checkcnt, EV_CHECK);
615
616 call_pending ();
617 } 3339 }
618 while (!ev_loop_done);
619 3340
620 if (ev_loop_done != 2) 3341 ev_embed_start (EV_A_ w);
621 ev_loop_done = 0;
622} 3342}
3343
3344#if 0
3345static void
3346embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3347{
3348 ev_idle_stop (EV_A_ idle);
3349}
3350#endif
3351
3352void
3353ev_embed_start (EV_P_ ev_embed *w)
3354{
3355 if (expect_false (ev_is_active (w)))
3356 return;
3357
3358 {
3359 EV_P = w->other;
3360 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3361 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3362 }
3363
3364 EV_FREQUENT_CHECK;
3365
3366 ev_set_priority (&w->io, ev_priority (w));
3367 ev_io_start (EV_A_ &w->io);
3368
3369 ev_prepare_init (&w->prepare, embed_prepare_cb);
3370 ev_set_priority (&w->prepare, EV_MINPRI);
3371 ev_prepare_start (EV_A_ &w->prepare);
3372
3373 ev_fork_init (&w->fork, embed_fork_cb);
3374 ev_fork_start (EV_A_ &w->fork);
3375
3376 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3377
3378 ev_start (EV_A_ (W)w, 1);
3379
3380 EV_FREQUENT_CHECK;
3381}
3382
3383void
3384ev_embed_stop (EV_P_ ev_embed *w)
3385{
3386 clear_pending (EV_A_ (W)w);
3387 if (expect_false (!ev_is_active (w)))
3388 return;
3389
3390 EV_FREQUENT_CHECK;
3391
3392 ev_io_stop (EV_A_ &w->io);
3393 ev_prepare_stop (EV_A_ &w->prepare);
3394 ev_fork_stop (EV_A_ &w->fork);
3395
3396 EV_FREQUENT_CHECK;
3397}
3398#endif
3399
3400#if EV_FORK_ENABLE
3401void
3402ev_fork_start (EV_P_ ev_fork *w)
3403{
3404 if (expect_false (ev_is_active (w)))
3405 return;
3406
3407 EV_FREQUENT_CHECK;
3408
3409 ev_start (EV_A_ (W)w, ++forkcnt);
3410 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3411 forks [forkcnt - 1] = w;
3412
3413 EV_FREQUENT_CHECK;
3414}
3415
3416void
3417ev_fork_stop (EV_P_ ev_fork *w)
3418{
3419 clear_pending (EV_A_ (W)w);
3420 if (expect_false (!ev_is_active (w)))
3421 return;
3422
3423 EV_FREQUENT_CHECK;
3424
3425 {
3426 int active = ev_active (w);
3427
3428 forks [active - 1] = forks [--forkcnt];
3429 ev_active (forks [active - 1]) = active;
3430 }
3431
3432 ev_stop (EV_A_ (W)w);
3433
3434 EV_FREQUENT_CHECK;
3435}
3436#endif
3437
3438#if EV_ASYNC_ENABLE
3439void
3440ev_async_start (EV_P_ ev_async *w)
3441{
3442 if (expect_false (ev_is_active (w)))
3443 return;
3444
3445 evpipe_init (EV_A);
3446
3447 EV_FREQUENT_CHECK;
3448
3449 ev_start (EV_A_ (W)w, ++asynccnt);
3450 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3451 asyncs [asynccnt - 1] = w;
3452
3453 EV_FREQUENT_CHECK;
3454}
3455
3456void
3457ev_async_stop (EV_P_ ev_async *w)
3458{
3459 clear_pending (EV_A_ (W)w);
3460 if (expect_false (!ev_is_active (w)))
3461 return;
3462
3463 EV_FREQUENT_CHECK;
3464
3465 {
3466 int active = ev_active (w);
3467
3468 asyncs [active - 1] = asyncs [--asynccnt];
3469 ev_active (asyncs [active - 1]) = active;
3470 }
3471
3472 ev_stop (EV_A_ (W)w);
3473
3474 EV_FREQUENT_CHECK;
3475}
3476
3477void
3478ev_async_send (EV_P_ ev_async *w)
3479{
3480 w->sent = 1;
3481 evpipe_write (EV_A_ &async_pending);
3482}
3483#endif
623 3484
624/*****************************************************************************/ 3485/*****************************************************************************/
625 3486
626static void
627wlist_add (WL *head, WL elem)
628{
629 elem->next = *head;
630 *head = elem;
631}
632
633static void
634wlist_del (WL *head, WL elem)
635{
636 while (*head)
637 {
638 if (*head == elem)
639 {
640 *head = elem->next;
641 return;
642 }
643
644 head = &(*head)->next;
645 }
646}
647
648static void
649ev_clear (W w)
650{
651 if (w->pending)
652 {
653 pendings [w->pending - 1].w = 0;
654 w->pending = 0;
655 }
656}
657
658static void
659ev_start (W w, int active)
660{
661 w->active = active;
662}
663
664static void
665ev_stop (W w)
666{
667 w->active = 0;
668}
669
670/*****************************************************************************/
671
672void
673evio_start (struct ev_io *w)
674{
675 if (ev_is_active (w))
676 return;
677
678 int fd = w->fd;
679
680 ev_start ((W)w, 1);
681 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
682 wlist_add ((WL *)&anfds[fd].head, (WL)w);
683
684 ++fdchangecnt;
685 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
686 fdchanges [fdchangecnt - 1] = fd;
687}
688
689void
690evio_stop (struct ev_io *w)
691{
692 ev_clear ((W)w);
693 if (!ev_is_active (w))
694 return;
695
696 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
697 ev_stop ((W)w);
698
699 ++fdchangecnt;
700 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
701 fdchanges [fdchangecnt - 1] = w->fd;
702}
703
704void
705evtimer_start (struct ev_timer *w)
706{
707 if (ev_is_active (w))
708 return;
709
710 w->at += now;
711
712 assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
713
714 ev_start ((W)w, ++timercnt);
715 array_needsize (timers, timermax, timercnt, );
716 timers [timercnt - 1] = w;
717 upheap ((WT *)timers, timercnt - 1);
718}
719
720void
721evtimer_stop (struct ev_timer *w)
722{
723 ev_clear ((W)w);
724 if (!ev_is_active (w))
725 return;
726
727 if (w->active < timercnt--)
728 {
729 timers [w->active - 1] = timers [timercnt];
730 downheap ((WT *)timers, timercnt, w->active - 1);
731 }
732
733 w->at = w->repeat;
734
735 ev_stop ((W)w);
736}
737
738void
739evtimer_again (struct ev_timer *w)
740{
741 if (ev_is_active (w))
742 {
743 if (w->repeat)
744 {
745 w->at = now + w->repeat;
746 downheap ((WT *)timers, timercnt, w->active - 1);
747 }
748 else
749 evtimer_stop (w);
750 }
751 else if (w->repeat)
752 evtimer_start (w);
753}
754
755void
756evperiodic_start (struct ev_periodic *w)
757{
758 if (ev_is_active (w))
759 return;
760
761 assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
762
763 /* this formula differs from the one in periodic_reify because we do not always round up */
764 if (w->interval)
765 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
766
767 ev_start ((W)w, ++periodiccnt);
768 array_needsize (periodics, periodicmax, periodiccnt, );
769 periodics [periodiccnt - 1] = w;
770 upheap ((WT *)periodics, periodiccnt - 1);
771}
772
773void
774evperiodic_stop (struct ev_periodic *w)
775{
776 ev_clear ((W)w);
777 if (!ev_is_active (w))
778 return;
779
780 if (w->active < periodiccnt--)
781 {
782 periodics [w->active - 1] = periodics [periodiccnt];
783 downheap ((WT *)periodics, periodiccnt, w->active - 1);
784 }
785
786 ev_stop ((W)w);
787}
788
789void
790evsignal_start (struct ev_signal *w)
791{
792 if (ev_is_active (w))
793 return;
794
795 ev_start ((W)w, 1);
796 array_needsize (signals, signalmax, w->signum, signals_init);
797 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
798
799 if (!w->next)
800 {
801 struct sigaction sa;
802 sa.sa_handler = sighandler;
803 sigfillset (&sa.sa_mask);
804 sa.sa_flags = 0;
805 sigaction (w->signum, &sa, 0);
806 }
807}
808
809void
810evsignal_stop (struct ev_signal *w)
811{
812 ev_clear ((W)w);
813 if (!ev_is_active (w))
814 return;
815
816 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
817 ev_stop ((W)w);
818
819 if (!signals [w->signum - 1].head)
820 signal (w->signum, SIG_DFL);
821}
822
823void evidle_start (struct ev_idle *w)
824{
825 if (ev_is_active (w))
826 return;
827
828 ev_start ((W)w, ++idlecnt);
829 array_needsize (idles, idlemax, idlecnt, );
830 idles [idlecnt - 1] = w;
831}
832
833void evidle_stop (struct ev_idle *w)
834{
835 ev_clear ((W)w);
836 if (ev_is_active (w))
837 return;
838
839 idles [w->active - 1] = idles [--idlecnt];
840 ev_stop ((W)w);
841}
842
843void evprepare_start (struct ev_prepare *w)
844{
845 if (ev_is_active (w))
846 return;
847
848 ev_start ((W)w, ++preparecnt);
849 array_needsize (prepares, preparemax, preparecnt, );
850 prepares [preparecnt - 1] = w;
851}
852
853void evprepare_stop (struct ev_prepare *w)
854{
855 ev_clear ((W)w);
856 if (ev_is_active (w))
857 return;
858
859 prepares [w->active - 1] = prepares [--preparecnt];
860 ev_stop ((W)w);
861}
862
863void evcheck_start (struct ev_check *w)
864{
865 if (ev_is_active (w))
866 return;
867
868 ev_start ((W)w, ++checkcnt);
869 array_needsize (checks, checkmax, checkcnt, );
870 checks [checkcnt - 1] = w;
871}
872
873void evcheck_stop (struct ev_check *w)
874{
875 ev_clear ((W)w);
876 if (ev_is_active (w))
877 return;
878
879 checks [w->active - 1] = checks [--checkcnt];
880 ev_stop ((W)w);
881}
882
883/*****************************************************************************/
884
885struct ev_once 3487struct ev_once
886{ 3488{
887 struct ev_io io; 3489 ev_io io;
888 struct ev_timer to; 3490 ev_timer to;
889 void (*cb)(int revents, void *arg); 3491 void (*cb)(int revents, void *arg);
890 void *arg; 3492 void *arg;
891}; 3493};
892 3494
893static void 3495static void
894once_cb (struct ev_once *once, int revents) 3496once_cb (EV_P_ struct ev_once *once, int revents)
895{ 3497{
896 void (*cb)(int revents, void *arg) = once->cb; 3498 void (*cb)(int revents, void *arg) = once->cb;
897 void *arg = once->arg; 3499 void *arg = once->arg;
898 3500
899 evio_stop (&once->io); 3501 ev_io_stop (EV_A_ &once->io);
900 evtimer_stop (&once->to); 3502 ev_timer_stop (EV_A_ &once->to);
901 free (once); 3503 ev_free (once);
902 3504
903 cb (revents, arg); 3505 cb (revents, arg);
904} 3506}
905 3507
906static void 3508static void
907once_cb_io (struct ev_io *w, int revents) 3509once_cb_io (EV_P_ ev_io *w, int revents)
908{ 3510{
909 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents); 3511 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3512
3513 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
910} 3514}
911 3515
912static void 3516static void
913once_cb_to (struct ev_timer *w, int revents) 3517once_cb_to (EV_P_ ev_timer *w, int revents)
914{ 3518{
915 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents); 3519 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
916}
917 3520
3521 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3522}
3523
918void 3524void
919ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) 3525ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
920{ 3526{
921 struct ev_once *once = malloc (sizeof (struct ev_once)); 3527 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
922 3528
923 if (!once) 3529 if (expect_false (!once))
924 cb (EV_ERROR, arg); 3530 {
925 else 3531 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3532 return;
926 { 3533 }
3534
927 once->cb = cb; 3535 once->cb = cb;
928 once->arg = arg; 3536 once->arg = arg;
929 3537
930 evw_init (&once->io, once_cb_io); 3538 ev_init (&once->io, once_cb_io);
931
932 if (fd >= 0) 3539 if (fd >= 0)
3540 {
3541 ev_io_set (&once->io, fd, events);
3542 ev_io_start (EV_A_ &once->io);
3543 }
3544
3545 ev_init (&once->to, once_cb_to);
3546 if (timeout >= 0.)
3547 {
3548 ev_timer_set (&once->to, timeout, 0.);
3549 ev_timer_start (EV_A_ &once->to);
3550 }
3551}
3552
3553/*****************************************************************************/
3554
3555#if EV_WALK_ENABLE
3556void
3557ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3558{
3559 int i, j;
3560 ev_watcher_list *wl, *wn;
3561
3562 if (types & (EV_IO | EV_EMBED))
3563 for (i = 0; i < anfdmax; ++i)
3564 for (wl = anfds [i].head; wl; )
933 { 3565 {
934 evio_set (&once->io, fd, events); 3566 wn = wl->next;
935 evio_start (&once->io); 3567
3568#if EV_EMBED_ENABLE
3569 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3570 {
3571 if (types & EV_EMBED)
3572 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3573 }
3574 else
3575#endif
3576#if EV_USE_INOTIFY
3577 if (ev_cb ((ev_io *)wl) == infy_cb)
3578 ;
3579 else
3580#endif
3581 if ((ev_io *)wl != &pipe_w)
3582 if (types & EV_IO)
3583 cb (EV_A_ EV_IO, wl);
3584
3585 wl = wn;
936 } 3586 }
937 3587
938 evw_init (&once->to, once_cb_to); 3588 if (types & (EV_TIMER | EV_STAT))
939 3589 for (i = timercnt + HEAP0; i-- > HEAP0; )
940 if (timeout >= 0.) 3590#if EV_STAT_ENABLE
3591 /*TODO: timer is not always active*/
3592 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
941 { 3593 {
942 evtimer_set (&once->to, timeout, 0.); 3594 if (types & EV_STAT)
943 evtimer_start (&once->to); 3595 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
944 } 3596 }
945 } 3597 else
946} 3598#endif
3599 if (types & EV_TIMER)
3600 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
947 3601
948/*****************************************************************************/ 3602#if EV_PERIODIC_ENABLE
3603 if (types & EV_PERIODIC)
3604 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3605 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3606#endif
949 3607
950#if 0 3608#if EV_IDLE_ENABLE
3609 if (types & EV_IDLE)
3610 for (j = NUMPRI; i--; )
3611 for (i = idlecnt [j]; i--; )
3612 cb (EV_A_ EV_IDLE, idles [j][i]);
3613#endif
951 3614
952struct ev_io wio; 3615#if EV_FORK_ENABLE
3616 if (types & EV_FORK)
3617 for (i = forkcnt; i--; )
3618 if (ev_cb (forks [i]) != embed_fork_cb)
3619 cb (EV_A_ EV_FORK, forks [i]);
3620#endif
953 3621
954static void 3622#if EV_ASYNC_ENABLE
955sin_cb (struct ev_io *w, int revents) 3623 if (types & EV_ASYNC)
956{ 3624 for (i = asynccnt; i--; )
957 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); 3625 cb (EV_A_ EV_ASYNC, asyncs [i]);
958} 3626#endif
959 3627
960static void 3628 if (types & EV_PREPARE)
961ocb (struct ev_timer *w, int revents) 3629 for (i = preparecnt; i--; )
962{ 3630#if EV_EMBED_ENABLE
963 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); 3631 if (ev_cb (prepares [i]) != embed_prepare_cb)
964 evtimer_stop (w); 3632#endif
965 evtimer_start (w); 3633 cb (EV_A_ EV_PREPARE, prepares [i]);
966}
967 3634
968static void 3635 if (types & EV_CHECK)
969scb (struct ev_signal *w, int revents) 3636 for (i = checkcnt; i--; )
970{ 3637 cb (EV_A_ EV_CHECK, checks [i]);
971 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
972 evio_stop (&wio);
973 evio_start (&wio);
974}
975 3638
976static void 3639 if (types & EV_SIGNAL)
977gcb (struct ev_signal *w, int revents)
978{
979 fprintf (stderr, "generic %x\n", revents);
980
981}
982
983int main (void)
984{
985 ev_init (0);
986
987 evio_init (&wio, sin_cb, 0, EV_READ);
988 evio_start (&wio);
989
990 struct ev_timer t[10000];
991
992#if 0
993 int i;
994 for (i = 0; i < 10000; ++i) 3640 for (i = 0; i < EV_NSIG - 1; ++i)
995 { 3641 for (wl = signals [i].head; wl; )
996 struct ev_timer *w = t + i; 3642 {
997 evw_init (w, ocb, i); 3643 wn = wl->next;
998 evtimer_init_abs (w, ocb, drand48 (), 0.99775533); 3644 cb (EV_A_ EV_SIGNAL, wl);
999 evtimer_start (w); 3645 wl = wn;
1000 if (drand48 () < 0.5) 3646 }
1001 evtimer_stop (w);
1002 }
1003#endif
1004 3647
1005 struct ev_timer t1; 3648 if (types & EV_CHILD)
1006 evtimer_init (&t1, ocb, 5, 10); 3649 for (i = EV_PID_HASHSIZE; i--; )
1007 evtimer_start (&t1); 3650 for (wl = childs [i]; wl; )
1008 3651 {
1009 struct ev_signal sig; 3652 wn = wl->next;
1010 evsignal_init (&sig, scb, SIGQUIT); 3653 cb (EV_A_ EV_CHILD, wl);
1011 evsignal_start (&sig); 3654 wl = wn;
1012 3655 }
1013 struct ev_check cw; 3656/* EV_STAT 0x00001000 /* stat data changed */
1014 evcheck_init (&cw, gcb); 3657/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
1015 evcheck_start (&cw);
1016
1017 struct ev_idle iw;
1018 evidle_init (&iw, gcb);
1019 evidle_start (&iw);
1020
1021 ev_loop (0);
1022
1023 return 0;
1024} 3658}
1025
1026#endif 3659#endif
1027 3660
3661#if EV_MULTIPLICITY
3662 #include "ev_wrap.h"
3663#endif
1028 3664
3665#ifdef __cplusplus
3666}
3667#endif
1029 3668
1030

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