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Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.325 by root, Sun Jan 24 12:31:55 2010 UTC

1/*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40#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
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
155
1#include <math.h> 156#include <math.h>
2#include <stdlib.h> 157#include <stdlib.h>
3#include <unistd.h> 158#include <string.h>
4#include <fcntl.h> 159#include <fcntl.h>
5#include <signal.h> 160#include <stddef.h>
6 161
7#include <stdio.h> 162#include <stdio.h>
8 163
9#include <assert.h> 164#include <assert.h>
10#include <errno.h> 165#include <errno.h>
11#include <sys/time.h> 166#include <sys/types.h>
12#include <time.h> 167#include <time.h>
13 168
169#include <signal.h>
170
171#ifdef EV_H
172# include EV_H
173#else
174# include "ev.h"
175#endif
176
177#ifndef _WIN32
178# include <sys/time.h>
179# include <sys/wait.h>
180# include <unistd.h>
181#else
182# include <io.h>
183# define WIN32_LEAN_AND_MEAN
184# include <windows.h>
185# ifndef EV_SELECT_IS_WINSOCKET
186# define EV_SELECT_IS_WINSOCKET 1
187# endif
188#endif
189
190/* this block tries to deduce configuration from header-defined symbols and defaults */
191
192/* try to deduce the maximum number of signals on this platform */
193#if defined (EV_NSIG)
194/* use what's provided */
195#elif defined (NSIG)
196# define EV_NSIG (NSIG)
197#elif defined(_NSIG)
198# define EV_NSIG (_NSIG)
199#elif defined (SIGMAX)
200# define EV_NSIG (SIGMAX+1)
201#elif defined (SIG_MAX)
202# define EV_NSIG (SIG_MAX+1)
203#elif defined (_SIG_MAX)
204# define EV_NSIG (_SIG_MAX+1)
205#elif defined (MAXSIG)
206# define EV_NSIG (MAXSIG+1)
207#elif defined (MAX_SIG)
208# define EV_NSIG (MAX_SIG+1)
209#elif defined (SIGARRAYSIZE)
210# define EV_NSIG SIGARRAYSIZE /* Assume ary[SIGARRAYSIZE] */
211#elif defined (_sys_nsig)
212# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
213#else
214# error "unable to find value for NSIG, please report"
215/* to make it compile regardless, just remove the above line */
216# define EV_NSIG 65
217#endif
218
219#ifndef EV_USE_CLOCK_SYSCALL
220# if __linux && __GLIBC__ >= 2
221# define EV_USE_CLOCK_SYSCALL 1
222# else
223# define EV_USE_CLOCK_SYSCALL 0
224# endif
225#endif
226
227#ifndef EV_USE_MONOTONIC
228# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
229# define EV_USE_MONOTONIC 1
230# else
231# define EV_USE_MONOTONIC 0
232# endif
233#endif
234
235#ifndef EV_USE_REALTIME
236# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
237#endif
238
239#ifndef EV_USE_NANOSLEEP
240# if _POSIX_C_SOURCE >= 199309L
241# define EV_USE_NANOSLEEP 1
242# else
243# define EV_USE_NANOSLEEP 0
244# endif
245#endif
246
247#ifndef EV_USE_SELECT
248# define EV_USE_SELECT 1
249#endif
250
251#ifndef EV_USE_POLL
252# ifdef _WIN32
253# define EV_USE_POLL 0
254# else
255# define EV_USE_POLL 1
256# endif
257#endif
258
259#ifndef EV_USE_EPOLL
260# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
261# define EV_USE_EPOLL 1
262# else
263# define EV_USE_EPOLL 0
264# endif
265#endif
266
267#ifndef EV_USE_KQUEUE
268# define EV_USE_KQUEUE 0
269#endif
270
271#ifndef EV_USE_PORT
272# define EV_USE_PORT 0
273#endif
274
275#ifndef EV_USE_INOTIFY
276# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
277# define EV_USE_INOTIFY 1
278# else
279# define EV_USE_INOTIFY 0
280# endif
281#endif
282
283#ifndef EV_PID_HASHSIZE
284# if EV_MINIMAL
285# define EV_PID_HASHSIZE 1
286# else
287# define EV_PID_HASHSIZE 16
288# endif
289#endif
290
291#ifndef EV_INOTIFY_HASHSIZE
292# if EV_MINIMAL
293# define EV_INOTIFY_HASHSIZE 1
294# else
295# define EV_INOTIFY_HASHSIZE 16
296# endif
297#endif
298
299#ifndef EV_USE_EVENTFD
300# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
301# define EV_USE_EVENTFD 1
302# else
303# define EV_USE_EVENTFD 0
304# endif
305#endif
306
307#ifndef EV_USE_SIGNALFD
308# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
309# define EV_USE_SIGNALFD 1
310# else
311# define EV_USE_SIGNALFD 0
312# endif
313#endif
314
315#if 0 /* debugging */
316# define EV_VERIFY 3
317# define EV_USE_4HEAP 1
318# define EV_HEAP_CACHE_AT 1
319#endif
320
321#ifndef EV_VERIFY
322# define EV_VERIFY !EV_MINIMAL
323#endif
324
325#ifndef EV_USE_4HEAP
326# define EV_USE_4HEAP !EV_MINIMAL
327#endif
328
329#ifndef EV_HEAP_CACHE_AT
330# define EV_HEAP_CACHE_AT !EV_MINIMAL
331#endif
332
333/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
334/* which makes programs even slower. might work on other unices, too. */
335#if EV_USE_CLOCK_SYSCALL
336# include <syscall.h>
337# ifdef SYS_clock_gettime
338# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
339# undef EV_USE_MONOTONIC
340# define EV_USE_MONOTONIC 1
341# else
342# undef EV_USE_CLOCK_SYSCALL
343# define EV_USE_CLOCK_SYSCALL 0
344# endif
345#endif
346
347/* this block fixes any misconfiguration where we know we run into trouble otherwise */
348
349#ifdef _AIX
350/* AIX has a completely broken poll.h header */
351# undef EV_USE_POLL
352# define EV_USE_POLL 0
353#endif
354
14#ifdef CLOCK_MONOTONIC 355#ifndef CLOCK_MONOTONIC
356# undef EV_USE_MONOTONIC
15# define HAVE_MONOTONIC 1 357# define EV_USE_MONOTONIC 0
358#endif
359
360#ifndef CLOCK_REALTIME
361# undef EV_USE_REALTIME
362# define EV_USE_REALTIME 0
363#endif
364
365#if !EV_STAT_ENABLE
366# undef EV_USE_INOTIFY
367# define EV_USE_INOTIFY 0
368#endif
369
370#if !EV_USE_NANOSLEEP
371# ifndef _WIN32
372# include <sys/select.h>
16#endif 373# endif
374#endif
17 375
18#define HAVE_REALTIME 1 376#if EV_USE_INOTIFY
19#define HAVE_EPOLL 1 377# include <sys/utsname.h>
20#define HAVE_SELECT 1 378# include <sys/statfs.h>
379# include <sys/inotify.h>
380/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
381# ifndef IN_DONT_FOLLOW
382# undef EV_USE_INOTIFY
383# define EV_USE_INOTIFY 0
384# endif
385#endif
386
387#if EV_SELECT_IS_WINSOCKET
388# include <winsock.h>
389#endif
390
391#if EV_USE_EVENTFD
392/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
393# include <stdint.h>
394# ifndef EFD_NONBLOCK
395# define EFD_NONBLOCK O_NONBLOCK
396# endif
397# ifndef EFD_CLOEXEC
398# ifdef O_CLOEXEC
399# define EFD_CLOEXEC O_CLOEXEC
400# else
401# define EFD_CLOEXEC 02000000
402# endif
403# endif
404# ifdef __cplusplus
405extern "C" {
406# endif
407int eventfd (unsigned int initval, int flags);
408# ifdef __cplusplus
409}
410# endif
411#endif
412
413#if EV_USE_SIGNALFD
414/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
415# include <stdint.h>
416# ifndef SFD_NONBLOCK
417# define SFD_NONBLOCK O_NONBLOCK
418# endif
419# ifndef SFD_CLOEXEC
420# ifdef O_CLOEXEC
421# define SFD_CLOEXEC O_CLOEXEC
422# else
423# define SFD_CLOEXEC 02000000
424# endif
425# endif
426# ifdef __cplusplus
427extern "C" {
428# endif
429int signalfd (int fd, const sigset_t *mask, int flags);
430
431struct signalfd_siginfo
432{
433 uint32_t ssi_signo;
434 char pad[128 - sizeof (uint32_t)];
435};
436# ifdef __cplusplus
437}
438# endif
439#endif
440
441
442/**/
443
444#if EV_VERIFY >= 3
445# define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
446#else
447# define EV_FREQUENT_CHECK do { } while (0)
448#endif
449
450/*
451 * This is used to avoid floating point rounding problems.
452 * It is added to ev_rt_now when scheduling periodics
453 * to ensure progress, time-wise, even when rounding
454 * errors are against us.
455 * This value is good at least till the year 4000.
456 * Better solutions welcome.
457 */
458#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
21 459
22#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 460#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23#define MAX_BLOCKTIME 60. 461#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
24 462
463#if __GNUC__ >= 4
464# define expect(expr,value) __builtin_expect ((expr),(value))
465# define noinline __attribute__ ((noinline))
466#else
467# define expect(expr,value) (expr)
468# define noinline
469# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
470# define inline
471# endif
472#endif
473
474#define expect_false(expr) expect ((expr) != 0, 0)
475#define expect_true(expr) expect ((expr) != 0, 1)
476#define inline_size static inline
477
478#if EV_MINIMAL
479# define inline_speed static noinline
480#else
481# define inline_speed static inline
482#endif
483
484#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
485
486#if EV_MINPRI == EV_MAXPRI
487# define ABSPRI(w) (((W)w), 0)
488#else
489# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
490#endif
491
492#define EMPTY /* required for microsofts broken pseudo-c compiler */
493#define EMPTY2(a,b) /* used to suppress some warnings */
494
495typedef ev_watcher *W;
496typedef ev_watcher_list *WL;
497typedef ev_watcher_time *WT;
498
499#define ev_active(w) ((W)(w))->active
500#define ev_at(w) ((WT)(w))->at
501
502#if EV_USE_REALTIME
503/* sig_atomic_t is used to avoid per-thread variables or locking but still */
504/* giving it a reasonably high chance of working on typical architetcures */
505static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
506#endif
507
508#if EV_USE_MONOTONIC
509static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
510#endif
511
512#ifndef EV_FD_TO_WIN32_HANDLE
513# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
514#endif
515#ifndef EV_WIN32_HANDLE_TO_FD
516# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
517#endif
518#ifndef EV_WIN32_CLOSE_FD
519# define EV_WIN32_CLOSE_FD(fd) close (fd)
520#endif
521
522#ifdef _WIN32
523# include "ev_win32.c"
524#endif
525
526/*****************************************************************************/
527
528static void (*syserr_cb)(const char *msg);
529
530void
531ev_set_syserr_cb (void (*cb)(const char *msg))
532{
533 syserr_cb = cb;
534}
535
536static void noinline
537ev_syserr (const char *msg)
538{
539 if (!msg)
540 msg = "(libev) system error";
541
542 if (syserr_cb)
543 syserr_cb (msg);
544 else
545 {
546 perror (msg);
547 abort ();
548 }
549}
550
551static void *
552ev_realloc_emul (void *ptr, long size)
553{
554 /* some systems, notably openbsd and darwin, fail to properly
555 * implement realloc (x, 0) (as required by both ansi c-98 and
556 * the single unix specification, so work around them here.
557 */
558
559 if (size)
560 return realloc (ptr, size);
561
562 free (ptr);
563 return 0;
564}
565
566static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
567
568void
569ev_set_allocator (void *(*cb)(void *ptr, long size))
570{
571 alloc = cb;
572}
573
574inline_speed void *
575ev_realloc (void *ptr, long size)
576{
577 ptr = alloc (ptr, size);
578
579 if (!ptr && size)
580 {
581 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
582 abort ();
583 }
584
585 return ptr;
586}
587
588#define ev_malloc(size) ev_realloc (0, (size))
589#define ev_free(ptr) ev_realloc ((ptr), 0)
590
591/*****************************************************************************/
592
593/* set in reify when reification needed */
594#define EV_ANFD_REIFY 1
595
596/* file descriptor info structure */
597typedef struct
598{
599 WL head;
600 unsigned char events; /* the events watched for */
601 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
602 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
603 unsigned char unused;
604#if EV_USE_EPOLL
605 unsigned int egen; /* generation counter to counter epoll bugs */
606#endif
607#if EV_SELECT_IS_WINSOCKET
608 SOCKET handle;
609#endif
610} ANFD;
611
612/* stores the pending event set for a given watcher */
613typedef struct
614{
615 W w;
616 int events; /* the pending event set for the given watcher */
617} ANPENDING;
618
619#if EV_USE_INOTIFY
620/* hash table entry per inotify-id */
621typedef struct
622{
623 WL head;
624} ANFS;
625#endif
626
627/* Heap Entry */
628#if EV_HEAP_CACHE_AT
629 /* a heap element */
630 typedef struct {
631 ev_tstamp at;
632 WT w;
633 } ANHE;
634
635 #define ANHE_w(he) (he).w /* access watcher, read-write */
636 #define ANHE_at(he) (he).at /* access cached at, read-only */
637 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
638#else
639 /* a heap element */
640 typedef WT ANHE;
641
642 #define ANHE_w(he) (he)
643 #define ANHE_at(he) (he)->at
644 #define ANHE_at_cache(he)
645#endif
646
647#if EV_MULTIPLICITY
648
649 struct ev_loop
650 {
651 ev_tstamp ev_rt_now;
652 #define ev_rt_now ((loop)->ev_rt_now)
653 #define VAR(name,decl) decl;
654 #include "ev_vars.h"
655 #undef VAR
656 };
25#include "ev.h" 657 #include "ev_wrap.h"
26 658
27struct ev_watcher { 659 static struct ev_loop default_loop_struct;
28 EV_WATCHER (ev_watcher); 660 struct ev_loop *ev_default_loop_ptr;
29};
30 661
31struct ev_watcher_list { 662#else
32 EV_WATCHER_LIST (ev_watcher_list);
33};
34 663
35static ev_tstamp now, diff; /* monotonic clock */
36ev_tstamp ev_now; 664 ev_tstamp ev_rt_now;
37int ev_method; 665 #define VAR(name,decl) static decl;
666 #include "ev_vars.h"
667 #undef VAR
38 668
39static int have_monotonic; /* runtime */ 669 static int ev_default_loop_ptr;
40 670
41static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 671#endif
42static void (*method_modify)(int fd, int oev, int nev);
43static void (*method_poll)(ev_tstamp timeout);
44 672
673#if EV_MINIMAL < 2
674# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
675# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
676# define EV_INVOKE_PENDING invoke_cb (EV_A)
677#else
678# define EV_RELEASE_CB (void)0
679# define EV_ACQUIRE_CB (void)0
680# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
681#endif
682
683#define EVUNLOOP_RECURSE 0x80
684
685/*****************************************************************************/
686
687#ifndef EV_HAVE_EV_TIME
45ev_tstamp 688ev_tstamp
46ev_time (void) 689ev_time (void)
47{ 690{
48#if HAVE_REALTIME 691#if EV_USE_REALTIME
692 if (expect_true (have_realtime))
693 {
49 struct timespec ts; 694 struct timespec ts;
50 clock_gettime (CLOCK_REALTIME, &ts); 695 clock_gettime (CLOCK_REALTIME, &ts);
51 return ts.tv_sec + ts.tv_nsec * 1e-9; 696 return ts.tv_sec + ts.tv_nsec * 1e-9;
52#else 697 }
698#endif
699
53 struct timeval tv; 700 struct timeval tv;
54 gettimeofday (&tv, 0); 701 gettimeofday (&tv, 0);
55 return tv.tv_sec + tv.tv_usec * 1e-6; 702 return tv.tv_sec + tv.tv_usec * 1e-6;
56#endif
57} 703}
704#endif
58 705
59static ev_tstamp 706inline_size ev_tstamp
60get_clock (void) 707get_clock (void)
61{ 708{
62#if HAVE_MONOTONIC 709#if EV_USE_MONOTONIC
63 if (have_monotonic) 710 if (expect_true (have_monotonic))
64 { 711 {
65 struct timespec ts; 712 struct timespec ts;
66 clock_gettime (CLOCK_MONOTONIC, &ts); 713 clock_gettime (CLOCK_MONOTONIC, &ts);
67 return ts.tv_sec + ts.tv_nsec * 1e-9; 714 return ts.tv_sec + ts.tv_nsec * 1e-9;
68 } 715 }
69#endif 716#endif
70 717
71 return ev_time (); 718 return ev_time ();
72} 719}
73 720
721#if EV_MULTIPLICITY
722ev_tstamp
723ev_now (EV_P)
724{
725 return ev_rt_now;
726}
727#endif
728
729void
730ev_sleep (ev_tstamp delay)
731{
732 if (delay > 0.)
733 {
734#if EV_USE_NANOSLEEP
735 struct timespec ts;
736
737 ts.tv_sec = (time_t)delay;
738 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
739
740 nanosleep (&ts, 0);
741#elif defined(_WIN32)
742 Sleep ((unsigned long)(delay * 1e3));
743#else
744 struct timeval tv;
745
746 tv.tv_sec = (time_t)delay;
747 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
748
749 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
750 /* something not guaranteed by newer posix versions, but guaranteed */
751 /* by older ones */
752 select (0, 0, 0, 0, &tv);
753#endif
754 }
755}
756
757/*****************************************************************************/
758
759#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
760
761/* find a suitable new size for the given array, */
762/* hopefully by rounding to a ncie-to-malloc size */
763inline_size int
764array_nextsize (int elem, int cur, int cnt)
765{
766 int ncur = cur + 1;
767
768 do
769 ncur <<= 1;
770 while (cnt > ncur);
771
772 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
773 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
774 {
775 ncur *= elem;
776 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
777 ncur = ncur - sizeof (void *) * 4;
778 ncur /= elem;
779 }
780
781 return ncur;
782}
783
784static noinline void *
785array_realloc (int elem, void *base, int *cur, int cnt)
786{
787 *cur = array_nextsize (elem, *cur, cnt);
788 return ev_realloc (base, elem * *cur);
789}
790
791#define array_init_zero(base,count) \
792 memset ((void *)(base), 0, sizeof (*(base)) * (count))
793
74#define array_needsize(base,cur,cnt,init) \ 794#define array_needsize(type,base,cur,cnt,init) \
75 if ((cnt) > cur) \ 795 if (expect_false ((cnt) > (cur))) \
76 { \ 796 { \
77 int newcnt = cur ? cur << 1 : 16; \ 797 int ocur_ = (cur); \
78 fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ 798 (base) = (type *)array_realloc \
79 base = realloc (base, sizeof (*base) * (newcnt)); \ 799 (sizeof (type), (base), &(cur), (cnt)); \
80 init (base + cur, newcnt - cur); \ 800 init ((base) + (ocur_), (cur) - ocur_); \
81 cur = newcnt; \
82 }
83
84typedef struct
85{
86 struct ev_io *head;
87 unsigned char wev, rev; /* want, received event set */
88} ANFD;
89
90static ANFD *anfds;
91static int anfdmax;
92
93static int *fdchanges;
94static int fdchangemax, fdchangecnt;
95
96static void
97anfds_init (ANFD *base, int count)
98{
99 while (count--)
100 { 801 }
101 base->head = 0;
102 base->wev = base->rev = EV_NONE;
103 ++base;
104 }
105}
106 802
107typedef struct 803#if 0
108{ 804#define array_slim(type,stem) \
109 struct ev_watcher *w; 805 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
110 int events; 806 { \
111} ANPENDING; 807 stem ## max = array_roundsize (stem ## cnt >> 1); \
808 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
809 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
810 }
811#endif
112 812
113static ANPENDING *pendings; 813#define array_free(stem, idx) \
114static int pendingmax, pendingcnt; 814 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
115 815
116static void 816/*****************************************************************************/
117event (struct ev_watcher *w, int events) 817
818/* dummy callback for pending events */
819static void noinline
820pendingcb (EV_P_ ev_prepare *w, int revents)
118{ 821{
119 w->pending = ++pendingcnt; 822}
120 array_needsize (pendings, pendingmax, pendingcnt, ); 823
121 pendings [pendingcnt - 1].w = w; 824void noinline
825ev_feed_event (EV_P_ void *w, int revents)
826{
827 W w_ = (W)w;
828 int pri = ABSPRI (w_);
829
830 if (expect_false (w_->pending))
122 pendings [pendingcnt - 1].events = events; 831 pendings [pri][w_->pending - 1].events |= revents;
832 else
833 {
834 w_->pending = ++pendingcnt [pri];
835 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
836 pendings [pri][w_->pending - 1].w = w_;
837 pendings [pri][w_->pending - 1].events = revents;
838 }
123} 839}
124 840
125static void 841inline_speed void
842feed_reverse (EV_P_ W w)
843{
844 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
845 rfeeds [rfeedcnt++] = w;
846}
847
848inline_size void
849feed_reverse_done (EV_P_ int revents)
850{
851 do
852 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
853 while (rfeedcnt);
854}
855
856inline_speed void
857queue_events (EV_P_ W *events, int eventcnt, int type)
858{
859 int i;
860
861 for (i = 0; i < eventcnt; ++i)
862 ev_feed_event (EV_A_ events [i], type);
863}
864
865/*****************************************************************************/
866
867inline_speed void
126fd_event (int fd, int events) 868fd_event_nc (EV_P_ int fd, int revents)
127{ 869{
128 ANFD *anfd = anfds + fd; 870 ANFD *anfd = anfds + fd;
129 struct ev_io *w; 871 ev_io *w;
130 872
131 for (w = anfd->head; w; w = w->next) 873 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
132 { 874 {
133 int ev = w->events & events; 875 int ev = w->events & revents;
134 876
135 if (ev) 877 if (ev)
136 event ((struct ev_watcher *)w, ev); 878 ev_feed_event (EV_A_ (W)w, ev);
137 }
138}
139
140static struct ev_timer **atimers;
141static int atimermax, atimercnt;
142
143static struct ev_timer **rtimers;
144static int rtimermax, rtimercnt;
145
146static void
147upheap (struct ev_timer **timers, int k)
148{
149 struct ev_timer *w = timers [k];
150
151 while (k && timers [k >> 1]->at > w->at)
152 {
153 timers [k] = timers [k >> 1];
154 timers [k]->active = k + 1;
155 k >>= 1;
156 }
157
158 timers [k] = w;
159 timers [k]->active = k + 1;
160
161}
162
163static void
164downheap (struct ev_timer **timers, int N, int k)
165{
166 struct ev_timer *w = timers [k];
167
168 while (k < (N >> 1))
169 {
170 int j = k << 1;
171
172 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
173 ++j;
174
175 if (w->at <= timers [j]->at)
176 break;
177
178 timers [k] = timers [j];
179 timers [k]->active = k + 1;
180 k = j;
181 }
182
183 timers [k] = w;
184 timers [k]->active = k + 1;
185}
186
187typedef struct
188{
189 struct ev_signal *head;
190 sig_atomic_t gotsig;
191} ANSIG;
192
193static ANSIG *signals;
194static int signalmax;
195
196static int sigpipe [2];
197static sig_atomic_t gotsig;
198static struct ev_io sigev;
199
200static void
201signals_init (ANSIG *base, int count)
202{
203 while (count--)
204 {
205 base->head = 0;
206 base->gotsig = 0;
207 ++base;
208 }
209}
210
211static void
212sighandler (int signum)
213{
214 signals [signum - 1].gotsig = 1;
215
216 if (!gotsig)
217 {
218 gotsig = 1;
219 write (sigpipe [1], &gotsig, 1);
220 }
221}
222
223static void
224sigcb (struct ev_io *iow, int revents)
225{
226 struct ev_signal *w;
227 int sig;
228
229 gotsig = 0;
230 read (sigpipe [0], &revents, 1);
231
232 for (sig = signalmax; sig--; )
233 if (signals [sig].gotsig)
234 {
235 signals [sig].gotsig = 0;
236
237 for (w = signals [sig].head; w; w = w->next)
238 event ((struct ev_watcher *)w, EV_SIGNAL);
239 } 879 }
240} 880}
241 881
242static void 882/* do not submit kernel events for fds that have reify set */
243siginit (void) 883/* because that means they changed while we were polling for new events */
884inline_speed void
885fd_event (EV_P_ int fd, int revents)
244{ 886{
245 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); 887 ANFD *anfd = anfds + fd;
246 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
247 888
248 /* rather than sort out wether we really need nb, set it */ 889 if (expect_true (!anfd->reify))
249 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 890 fd_event_nc (EV_A_ fd, revents);
250 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
251
252 evio_set (&sigev, sigpipe [0], EV_READ);
253 evio_start (&sigev);
254} 891}
255 892
256#if HAVE_EPOLL 893void
257# include "ev_epoll.c" 894ev_feed_fd_event (EV_P_ int fd, int revents)
258#endif
259#if HAVE_SELECT
260# include "ev_select.c"
261#endif
262
263int ev_init (int flags)
264{ 895{
265#if HAVE_MONOTONIC 896 if (fd >= 0 && fd < anfdmax)
266 { 897 fd_event_nc (EV_A_ fd, revents);
267 struct timespec ts;
268 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269 have_monotonic = 1;
270 }
271#endif
272
273 ev_now = ev_time ();
274 now = get_clock ();
275 diff = ev_now - now;
276
277 if (pipe (sigpipe))
278 return 0;
279
280 ev_method = EVMETHOD_NONE;
281#if HAVE_EPOLL
282 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
283#endif
284#if HAVE_SELECT
285 if (ev_method == EVMETHOD_NONE) select_init (flags);
286#endif
287
288 if (ev_method)
289 {
290 evw_init (&sigev, sigcb, 0);
291 siginit ();
292 }
293
294 return ev_method;
295} 898}
296 899
297void ev_prefork (void) 900/* make sure the external fd watch events are in-sync */
298{ 901/* with the kernel/libev internal state */
299} 902inline_size void
300 903fd_reify (EV_P)
301void ev_postfork_parent (void)
302{
303}
304
305void ev_postfork_child (void)
306{
307#if HAVE_EPOLL
308 if (ev_method == EVMETHOD_EPOLL)
309 epoll_postfork_child ();
310#endif
311
312 evio_stop (&sigev);
313 close (sigpipe [0]);
314 close (sigpipe [1]);
315 pipe (sigpipe);
316 siginit ();
317}
318
319static void
320fd_reify (void)
321{ 904{
322 int i; 905 int i;
323 906
324 for (i = 0; i < fdchangecnt; ++i) 907 for (i = 0; i < fdchangecnt; ++i)
325 { 908 {
326 int fd = fdchanges [i]; 909 int fd = fdchanges [i];
327 ANFD *anfd = anfds + fd; 910 ANFD *anfd = anfds + fd;
328 struct ev_io *w; 911 ev_io *w;
329 912
330 int wev = 0; 913 unsigned char events = 0;
331 914
332 for (w = anfd->head; w; w = w->next) 915 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
333 wev |= w->events; 916 events |= (unsigned char)w->events;
334 917
335 if (anfd->wev != wev) 918#if EV_SELECT_IS_WINSOCKET
919 if (events)
336 { 920 {
337 method_modify (fd, anfd->wev, wev); 921 unsigned long arg;
338 anfd->wev = wev; 922 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
923 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
339 } 924 }
925#endif
926
927 {
928 unsigned char o_events = anfd->events;
929 unsigned char o_reify = anfd->reify;
930
931 anfd->reify = 0;
932 anfd->events = events;
933
934 if (o_events != events || o_reify & EV__IOFDSET)
935 backend_modify (EV_A_ fd, o_events, events);
936 }
340 } 937 }
341 938
342 fdchangecnt = 0; 939 fdchangecnt = 0;
343} 940}
344 941
942/* something about the given fd changed */
943inline_size void
944fd_change (EV_P_ int fd, int flags)
945{
946 unsigned char reify = anfds [fd].reify;
947 anfds [fd].reify |= flags;
948
949 if (expect_true (!reify))
950 {
951 ++fdchangecnt;
952 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
953 fdchanges [fdchangecnt - 1] = fd;
954 }
955}
956
957/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
958inline_speed void
959fd_kill (EV_P_ int fd)
960{
961 ev_io *w;
962
963 while ((w = (ev_io *)anfds [fd].head))
964 {
965 ev_io_stop (EV_A_ w);
966 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
967 }
968}
969
970/* check whether the given fd is atcually valid, for error recovery */
971inline_size int
972fd_valid (int fd)
973{
974#ifdef _WIN32
975 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
976#else
977 return fcntl (fd, F_GETFD) != -1;
978#endif
979}
980
981/* called on EBADF to verify fds */
982static void noinline
983fd_ebadf (EV_P)
984{
985 int fd;
986
987 for (fd = 0; fd < anfdmax; ++fd)
988 if (anfds [fd].events)
989 if (!fd_valid (fd) && errno == EBADF)
990 fd_kill (EV_A_ fd);
991}
992
993/* called on ENOMEM in select/poll to kill some fds and retry */
994static void noinline
995fd_enomem (EV_P)
996{
997 int fd;
998
999 for (fd = anfdmax; fd--; )
1000 if (anfds [fd].events)
1001 {
1002 fd_kill (EV_A_ fd);
1003 break;
1004 }
1005}
1006
1007/* usually called after fork if backend needs to re-arm all fds from scratch */
1008static void noinline
1009fd_rearm_all (EV_P)
1010{
1011 int fd;
1012
1013 for (fd = 0; fd < anfdmax; ++fd)
1014 if (anfds [fd].events)
1015 {
1016 anfds [fd].events = 0;
1017 anfds [fd].emask = 0;
1018 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1019 }
1020}
1021
1022/*****************************************************************************/
1023
1024/*
1025 * the heap functions want a real array index. array index 0 uis guaranteed to not
1026 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1027 * the branching factor of the d-tree.
1028 */
1029
1030/*
1031 * at the moment we allow libev the luxury of two heaps,
1032 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1033 * which is more cache-efficient.
1034 * the difference is about 5% with 50000+ watchers.
1035 */
1036#if EV_USE_4HEAP
1037
1038#define DHEAP 4
1039#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1040#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1041#define UPHEAP_DONE(p,k) ((p) == (k))
1042
1043/* away from the root */
1044inline_speed void
1045downheap (ANHE *heap, int N, int k)
1046{
1047 ANHE he = heap [k];
1048 ANHE *E = heap + N + HEAP0;
1049
1050 for (;;)
1051 {
1052 ev_tstamp minat;
1053 ANHE *minpos;
1054 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1055
1056 /* find minimum child */
1057 if (expect_true (pos + DHEAP - 1 < E))
1058 {
1059 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1060 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1061 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1062 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1063 }
1064 else if (pos < E)
1065 {
1066 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1067 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1068 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1069 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1070 }
1071 else
1072 break;
1073
1074 if (ANHE_at (he) <= minat)
1075 break;
1076
1077 heap [k] = *minpos;
1078 ev_active (ANHE_w (*minpos)) = k;
1079
1080 k = minpos - heap;
1081 }
1082
1083 heap [k] = he;
1084 ev_active (ANHE_w (he)) = k;
1085}
1086
1087#else /* 4HEAP */
1088
1089#define HEAP0 1
1090#define HPARENT(k) ((k) >> 1)
1091#define UPHEAP_DONE(p,k) (!(p))
1092
1093/* away from the root */
1094inline_speed void
1095downheap (ANHE *heap, int N, int k)
1096{
1097 ANHE he = heap [k];
1098
1099 for (;;)
1100 {
1101 int c = k << 1;
1102
1103 if (c >= N + HEAP0)
1104 break;
1105
1106 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1107 ? 1 : 0;
1108
1109 if (ANHE_at (he) <= ANHE_at (heap [c]))
1110 break;
1111
1112 heap [k] = heap [c];
1113 ev_active (ANHE_w (heap [k])) = k;
1114
1115 k = c;
1116 }
1117
1118 heap [k] = he;
1119 ev_active (ANHE_w (he)) = k;
1120}
1121#endif
1122
1123/* towards the root */
1124inline_speed void
1125upheap (ANHE *heap, int k)
1126{
1127 ANHE he = heap [k];
1128
1129 for (;;)
1130 {
1131 int p = HPARENT (k);
1132
1133 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1134 break;
1135
1136 heap [k] = heap [p];
1137 ev_active (ANHE_w (heap [k])) = k;
1138 k = p;
1139 }
1140
1141 heap [k] = he;
1142 ev_active (ANHE_w (he)) = k;
1143}
1144
1145/* move an element suitably so it is in a correct place */
1146inline_size void
1147adjustheap (ANHE *heap, int N, int k)
1148{
1149 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1150 upheap (heap, k);
1151 else
1152 downheap (heap, N, k);
1153}
1154
1155/* rebuild the heap: this function is used only once and executed rarely */
1156inline_size void
1157reheap (ANHE *heap, int N)
1158{
1159 int i;
1160
1161 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1162 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1163 for (i = 0; i < N; ++i)
1164 upheap (heap, i + HEAP0);
1165}
1166
1167/*****************************************************************************/
1168
1169/* associate signal watchers to a signal signal */
1170typedef struct
1171{
1172 EV_ATOMIC_T pending;
1173#if EV_MULTIPLICITY
1174 EV_P;
1175#endif
1176 WL head;
1177} ANSIG;
1178
1179static ANSIG signals [EV_NSIG - 1];
1180
1181/*****************************************************************************/
1182
1183/* used to prepare libev internal fd's */
1184/* this is not fork-safe */
1185inline_speed void
1186fd_intern (int fd)
1187{
1188#ifdef _WIN32
1189 unsigned long arg = 1;
1190 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1191#else
1192 fcntl (fd, F_SETFD, FD_CLOEXEC);
1193 fcntl (fd, F_SETFL, O_NONBLOCK);
1194#endif
1195}
1196
1197static void noinline
1198evpipe_init (EV_P)
1199{
1200 if (!ev_is_active (&pipe_w))
1201 {
1202#if EV_USE_EVENTFD
1203 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1204 if (evfd < 0 && errno == EINVAL)
1205 evfd = eventfd (0, 0);
1206
1207 if (evfd >= 0)
1208 {
1209 evpipe [0] = -1;
1210 fd_intern (evfd); /* doing it twice doesn't hurt */
1211 ev_io_set (&pipe_w, evfd, EV_READ);
1212 }
1213 else
1214#endif
1215 {
1216 while (pipe (evpipe))
1217 ev_syserr ("(libev) error creating signal/async pipe");
1218
1219 fd_intern (evpipe [0]);
1220 fd_intern (evpipe [1]);
1221 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1222 }
1223
1224 ev_io_start (EV_A_ &pipe_w);
1225 ev_unref (EV_A); /* watcher should not keep loop alive */
1226 }
1227}
1228
1229inline_size void
1230evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1231{
1232 if (!*flag)
1233 {
1234 int old_errno = errno; /* save errno because write might clobber it */
1235
1236 *flag = 1;
1237
1238#if EV_USE_EVENTFD
1239 if (evfd >= 0)
1240 {
1241 uint64_t counter = 1;
1242 write (evfd, &counter, sizeof (uint64_t));
1243 }
1244 else
1245#endif
1246 write (evpipe [1], &old_errno, 1);
1247
1248 errno = old_errno;
1249 }
1250}
1251
1252/* called whenever the libev signal pipe */
1253/* got some events (signal, async) */
345static void 1254static void
346call_pending () 1255pipecb (EV_P_ ev_io *iow, int revents)
347{ 1256{
348 int i; 1257 int i;
349 1258
350 for (i = 0; i < pendingcnt; ++i) 1259#if EV_USE_EVENTFD
1260 if (evfd >= 0)
1261 {
1262 uint64_t counter;
1263 read (evfd, &counter, sizeof (uint64_t));
351 { 1264 }
352 ANPENDING *p = pendings + i; 1265 else
1266#endif
1267 {
1268 char dummy;
1269 read (evpipe [0], &dummy, 1);
1270 }
353 1271
354 if (p->w) 1272 if (sig_pending)
1273 {
1274 sig_pending = 0;
1275
1276 for (i = EV_NSIG - 1; i--; )
1277 if (expect_false (signals [i].pending))
1278 ev_feed_signal_event (EV_A_ i + 1);
1279 }
1280
1281#if EV_ASYNC_ENABLE
1282 if (async_pending)
1283 {
1284 async_pending = 0;
1285
1286 for (i = asynccnt; i--; )
1287 if (asyncs [i]->sent)
1288 {
1289 asyncs [i]->sent = 0;
1290 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1291 }
1292 }
1293#endif
1294}
1295
1296/*****************************************************************************/
1297
1298static void
1299ev_sighandler (int signum)
1300{
1301#if EV_MULTIPLICITY
1302 EV_P = signals [signum - 1].loop;
1303#endif
1304
1305#ifdef _WIN32
1306 signal (signum, ev_sighandler);
1307#endif
1308
1309 signals [signum - 1].pending = 1;
1310 evpipe_write (EV_A_ &sig_pending);
1311}
1312
1313void noinline
1314ev_feed_signal_event (EV_P_ int signum)
1315{
1316 WL w;
1317
1318 if (expect_false (signum <= 0 || signum > EV_NSIG))
1319 return;
1320
1321 --signum;
1322
1323#if EV_MULTIPLICITY
1324 /* it is permissible to try to feed a signal to the wrong loop */
1325 /* or, likely more useful, feeding a signal nobody is waiting for */
1326
1327 if (expect_false (signals [signum].loop != EV_A))
1328 return;
1329#endif
1330
1331 signals [signum].pending = 0;
1332
1333 for (w = signals [signum].head; w; w = w->next)
1334 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1335}
1336
1337#if EV_USE_SIGNALFD
1338static void
1339sigfdcb (EV_P_ ev_io *iow, int revents)
1340{
1341 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1342
1343 for (;;)
1344 {
1345 ssize_t res = read (sigfd, si, sizeof (si));
1346
1347 /* not ISO-C, as res might be -1, but works with SuS */
1348 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1349 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1350
1351 if (res < (ssize_t)sizeof (si))
1352 break;
1353 }
1354}
1355#endif
1356
1357/*****************************************************************************/
1358
1359static WL childs [EV_PID_HASHSIZE];
1360
1361#ifndef _WIN32
1362
1363static ev_signal childev;
1364
1365#ifndef WIFCONTINUED
1366# define WIFCONTINUED(status) 0
1367#endif
1368
1369/* handle a single child status event */
1370inline_speed void
1371child_reap (EV_P_ int chain, int pid, int status)
1372{
1373 ev_child *w;
1374 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1375
1376 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1377 {
1378 if ((w->pid == pid || !w->pid)
1379 && (!traced || (w->flags & 1)))
355 { 1380 {
356 p->w->pending = 0; 1381 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
357 p->w->cb (p->w, p->events); 1382 w->rpid = pid;
1383 w->rstatus = status;
1384 ev_feed_event (EV_A_ (W)w, EV_CHILD);
358 } 1385 }
359 } 1386 }
360
361 pendingcnt = 0;
362} 1387}
363 1388
1389#ifndef WCONTINUED
1390# define WCONTINUED 0
1391#endif
1392
1393/* called on sigchld etc., calls waitpid */
364static void 1394static void
365timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now) 1395childcb (EV_P_ ev_signal *sw, int revents)
366{ 1396{
367 while (timercnt && timers [0]->at <= now) 1397 int pid, status;
1398
1399 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1400 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1401 if (!WCONTINUED
1402 || errno != EINVAL
1403 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1404 return;
1405
1406 /* make sure we are called again until all children have been reaped */
1407 /* we need to do it this way so that the callback gets called before we continue */
1408 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1409
1410 child_reap (EV_A_ pid, pid, status);
1411 if (EV_PID_HASHSIZE > 1)
1412 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1413}
1414
1415#endif
1416
1417/*****************************************************************************/
1418
1419#if EV_USE_PORT
1420# include "ev_port.c"
1421#endif
1422#if EV_USE_KQUEUE
1423# include "ev_kqueue.c"
1424#endif
1425#if EV_USE_EPOLL
1426# include "ev_epoll.c"
1427#endif
1428#if EV_USE_POLL
1429# include "ev_poll.c"
1430#endif
1431#if EV_USE_SELECT
1432# include "ev_select.c"
1433#endif
1434
1435int
1436ev_version_major (void)
1437{
1438 return EV_VERSION_MAJOR;
1439}
1440
1441int
1442ev_version_minor (void)
1443{
1444 return EV_VERSION_MINOR;
1445}
1446
1447/* return true if we are running with elevated privileges and should ignore env variables */
1448int inline_size
1449enable_secure (void)
1450{
1451#ifdef _WIN32
1452 return 0;
1453#else
1454 return getuid () != geteuid ()
1455 || getgid () != getegid ();
1456#endif
1457}
1458
1459unsigned int
1460ev_supported_backends (void)
1461{
1462 unsigned int flags = 0;
1463
1464 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1465 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1466 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1467 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1468 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1469
1470 return flags;
1471}
1472
1473unsigned int
1474ev_recommended_backends (void)
1475{
1476 unsigned int flags = ev_supported_backends ();
1477
1478#ifndef __NetBSD__
1479 /* kqueue is borked on everything but netbsd apparently */
1480 /* it usually doesn't work correctly on anything but sockets and pipes */
1481 flags &= ~EVBACKEND_KQUEUE;
1482#endif
1483#ifdef __APPLE__
1484 /* only select works correctly on that "unix-certified" platform */
1485 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1486 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1487#endif
1488
1489 return flags;
1490}
1491
1492unsigned int
1493ev_embeddable_backends (void)
1494{
1495 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1496
1497 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1498 /* please fix it and tell me how to detect the fix */
1499 flags &= ~EVBACKEND_EPOLL;
1500
1501 return flags;
1502}
1503
1504unsigned int
1505ev_backend (EV_P)
1506{
1507 return backend;
1508}
1509
1510#if EV_MINIMAL < 2
1511unsigned int
1512ev_loop_count (EV_P)
1513{
1514 return loop_count;
1515}
1516
1517unsigned int
1518ev_loop_depth (EV_P)
1519{
1520 return loop_depth;
1521}
1522
1523void
1524ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1525{
1526 io_blocktime = interval;
1527}
1528
1529void
1530ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1531{
1532 timeout_blocktime = interval;
1533}
1534
1535void
1536ev_set_userdata (EV_P_ void *data)
1537{
1538 userdata = data;
1539}
1540
1541void *
1542ev_userdata (EV_P)
1543{
1544 return userdata;
1545}
1546
1547void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1548{
1549 invoke_cb = invoke_pending_cb;
1550}
1551
1552void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1553{
1554 release_cb = release;
1555 acquire_cb = acquire;
1556}
1557#endif
1558
1559/* initialise a loop structure, must be zero-initialised */
1560static void noinline
1561loop_init (EV_P_ unsigned int flags)
1562{
1563 if (!backend)
1564 {
1565#if EV_USE_REALTIME
1566 if (!have_realtime)
1567 {
1568 struct timespec ts;
1569
1570 if (!clock_gettime (CLOCK_REALTIME, &ts))
1571 have_realtime = 1;
1572 }
1573#endif
1574
1575#if EV_USE_MONOTONIC
1576 if (!have_monotonic)
1577 {
1578 struct timespec ts;
1579
1580 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1581 have_monotonic = 1;
1582 }
1583#endif
1584
1585 /* pid check not overridable via env */
1586#ifndef _WIN32
1587 if (flags & EVFLAG_FORKCHECK)
1588 curpid = getpid ();
1589#endif
1590
1591 if (!(flags & EVFLAG_NOENV)
1592 && !enable_secure ()
1593 && getenv ("LIBEV_FLAGS"))
1594 flags = atoi (getenv ("LIBEV_FLAGS"));
1595
1596 ev_rt_now = ev_time ();
1597 mn_now = get_clock ();
1598 now_floor = mn_now;
1599 rtmn_diff = ev_rt_now - mn_now;
1600#if EV_MINIMAL < 2
1601 invoke_cb = ev_invoke_pending;
1602#endif
1603
1604 io_blocktime = 0.;
1605 timeout_blocktime = 0.;
1606 backend = 0;
1607 backend_fd = -1;
1608 sig_pending = 0;
1609#if EV_ASYNC_ENABLE
1610 async_pending = 0;
1611#endif
1612#if EV_USE_INOTIFY
1613 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1614#endif
1615#if EV_USE_SIGNALFD
1616 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1617#endif
1618
1619 if (!(flags & 0x0000ffffU))
1620 flags |= ev_recommended_backends ();
1621
1622#if EV_USE_PORT
1623 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1624#endif
1625#if EV_USE_KQUEUE
1626 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1627#endif
1628#if EV_USE_EPOLL
1629 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1630#endif
1631#if EV_USE_POLL
1632 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1633#endif
1634#if EV_USE_SELECT
1635 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1636#endif
1637
1638 ev_prepare_init (&pending_w, pendingcb);
1639
1640 ev_init (&pipe_w, pipecb);
1641 ev_set_priority (&pipe_w, EV_MAXPRI);
1642 }
1643}
1644
1645/* free up a loop structure */
1646static void noinline
1647loop_destroy (EV_P)
1648{
1649 int i;
1650
1651 if (ev_is_active (&pipe_w))
1652 {
1653 /*ev_ref (EV_A);*/
1654 /*ev_io_stop (EV_A_ &pipe_w);*/
1655
1656#if EV_USE_EVENTFD
1657 if (evfd >= 0)
1658 close (evfd);
1659#endif
1660
1661 if (evpipe [0] >= 0)
1662 {
1663 EV_WIN32_CLOSE_FD (evpipe [0]);
1664 EV_WIN32_CLOSE_FD (evpipe [1]);
1665 }
1666 }
1667
1668#if EV_USE_SIGNALFD
1669 if (ev_is_active (&sigfd_w))
1670 close (sigfd);
1671#endif
1672
1673#if EV_USE_INOTIFY
1674 if (fs_fd >= 0)
1675 close (fs_fd);
1676#endif
1677
1678 if (backend_fd >= 0)
1679 close (backend_fd);
1680
1681#if EV_USE_PORT
1682 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1683#endif
1684#if EV_USE_KQUEUE
1685 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1686#endif
1687#if EV_USE_EPOLL
1688 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1689#endif
1690#if EV_USE_POLL
1691 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1692#endif
1693#if EV_USE_SELECT
1694 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1695#endif
1696
1697 for (i = NUMPRI; i--; )
1698 {
1699 array_free (pending, [i]);
1700#if EV_IDLE_ENABLE
1701 array_free (idle, [i]);
1702#endif
1703 }
1704
1705 ev_free (anfds); anfds = 0; anfdmax = 0;
1706
1707 /* have to use the microsoft-never-gets-it-right macro */
1708 array_free (rfeed, EMPTY);
1709 array_free (fdchange, EMPTY);
1710 array_free (timer, EMPTY);
1711#if EV_PERIODIC_ENABLE
1712 array_free (periodic, EMPTY);
1713#endif
1714#if EV_FORK_ENABLE
1715 array_free (fork, EMPTY);
1716#endif
1717 array_free (prepare, EMPTY);
1718 array_free (check, EMPTY);
1719#if EV_ASYNC_ENABLE
1720 array_free (async, EMPTY);
1721#endif
1722
1723 backend = 0;
1724}
1725
1726#if EV_USE_INOTIFY
1727inline_size void infy_fork (EV_P);
1728#endif
1729
1730inline_size void
1731loop_fork (EV_P)
1732{
1733#if EV_USE_PORT
1734 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1735#endif
1736#if EV_USE_KQUEUE
1737 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1738#endif
1739#if EV_USE_EPOLL
1740 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1741#endif
1742#if EV_USE_INOTIFY
1743 infy_fork (EV_A);
1744#endif
1745
1746 if (ev_is_active (&pipe_w))
1747 {
1748 /* this "locks" the handlers against writing to the pipe */
1749 /* while we modify the fd vars */
1750 sig_pending = 1;
1751#if EV_ASYNC_ENABLE
1752 async_pending = 1;
1753#endif
1754
1755 ev_ref (EV_A);
1756 ev_io_stop (EV_A_ &pipe_w);
1757
1758#if EV_USE_EVENTFD
1759 if (evfd >= 0)
1760 close (evfd);
1761#endif
1762
1763 if (evpipe [0] >= 0)
1764 {
1765 EV_WIN32_CLOSE_FD (evpipe [0]);
1766 EV_WIN32_CLOSE_FD (evpipe [1]);
1767 }
1768
1769 evpipe_init (EV_A);
1770 /* now iterate over everything, in case we missed something */
1771 pipecb (EV_A_ &pipe_w, EV_READ);
1772 }
1773
1774 postfork = 0;
1775}
1776
1777#if EV_MULTIPLICITY
1778
1779struct ev_loop *
1780ev_loop_new (unsigned int flags)
1781{
1782 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1783
1784 memset (EV_A, 0, sizeof (struct ev_loop));
1785 loop_init (EV_A_ flags);
1786
1787 if (ev_backend (EV_A))
1788 return EV_A;
1789
1790 return 0;
1791}
1792
1793void
1794ev_loop_destroy (EV_P)
1795{
1796 loop_destroy (EV_A);
1797 ev_free (loop);
1798}
1799
1800void
1801ev_loop_fork (EV_P)
1802{
1803 postfork = 1; /* must be in line with ev_default_fork */
1804}
1805#endif /* multiplicity */
1806
1807#if EV_VERIFY
1808static void noinline
1809verify_watcher (EV_P_ W w)
1810{
1811 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1812
1813 if (w->pending)
1814 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1815}
1816
1817static void noinline
1818verify_heap (EV_P_ ANHE *heap, int N)
1819{
1820 int i;
1821
1822 for (i = HEAP0; i < N + HEAP0; ++i)
1823 {
1824 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1825 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1826 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1827
1828 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1829 }
1830}
1831
1832static void noinline
1833array_verify (EV_P_ W *ws, int cnt)
1834{
1835 while (cnt--)
1836 {
1837 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1838 verify_watcher (EV_A_ ws [cnt]);
1839 }
1840}
1841#endif
1842
1843#if EV_MINIMAL < 2
1844void
1845ev_loop_verify (EV_P)
1846{
1847#if EV_VERIFY
1848 int i;
1849 WL w;
1850
1851 assert (activecnt >= -1);
1852
1853 assert (fdchangemax >= fdchangecnt);
1854 for (i = 0; i < fdchangecnt; ++i)
1855 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1856
1857 assert (anfdmax >= 0);
1858 for (i = 0; i < anfdmax; ++i)
1859 for (w = anfds [i].head; w; w = w->next)
368 { 1860 {
369 struct ev_timer *w = timers [0]; 1861 verify_watcher (EV_A_ (W)w);
1862 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
1863 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1864 }
370 1865
1866 assert (timermax >= timercnt);
1867 verify_heap (EV_A_ timers, timercnt);
1868
1869#if EV_PERIODIC_ENABLE
1870 assert (periodicmax >= periodiccnt);
1871 verify_heap (EV_A_ periodics, periodiccnt);
1872#endif
1873
1874 for (i = NUMPRI; i--; )
1875 {
1876 assert (pendingmax [i] >= pendingcnt [i]);
1877#if EV_IDLE_ENABLE
1878 assert (idleall >= 0);
1879 assert (idlemax [i] >= idlecnt [i]);
1880 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1881#endif
1882 }
1883
1884#if EV_FORK_ENABLE
1885 assert (forkmax >= forkcnt);
1886 array_verify (EV_A_ (W *)forks, forkcnt);
1887#endif
1888
1889#if EV_ASYNC_ENABLE
1890 assert (asyncmax >= asynccnt);
1891 array_verify (EV_A_ (W *)asyncs, asynccnt);
1892#endif
1893
1894 assert (preparemax >= preparecnt);
1895 array_verify (EV_A_ (W *)prepares, preparecnt);
1896
1897 assert (checkmax >= checkcnt);
1898 array_verify (EV_A_ (W *)checks, checkcnt);
1899
1900# if 0
1901 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1902 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
1903# endif
1904#endif
1905}
1906#endif
1907
1908#if EV_MULTIPLICITY
1909struct ev_loop *
1910ev_default_loop_init (unsigned int flags)
1911#else
1912int
1913ev_default_loop (unsigned int flags)
1914#endif
1915{
1916 if (!ev_default_loop_ptr)
1917 {
1918#if EV_MULTIPLICITY
1919 EV_P = ev_default_loop_ptr = &default_loop_struct;
1920#else
1921 ev_default_loop_ptr = 1;
1922#endif
1923
1924 loop_init (EV_A_ flags);
1925
1926 if (ev_backend (EV_A))
1927 {
1928#ifndef _WIN32
1929 ev_signal_init (&childev, childcb, SIGCHLD);
1930 ev_set_priority (&childev, EV_MAXPRI);
1931 ev_signal_start (EV_A_ &childev);
1932 ev_unref (EV_A); /* child watcher should not keep loop alive */
1933#endif
1934 }
1935 else
1936 ev_default_loop_ptr = 0;
1937 }
1938
1939 return ev_default_loop_ptr;
1940}
1941
1942void
1943ev_default_destroy (void)
1944{
1945#if EV_MULTIPLICITY
1946 EV_P = ev_default_loop_ptr;
1947#endif
1948
1949 ev_default_loop_ptr = 0;
1950
1951#ifndef _WIN32
1952 ev_ref (EV_A); /* child watcher */
1953 ev_signal_stop (EV_A_ &childev);
1954#endif
1955
1956 loop_destroy (EV_A);
1957}
1958
1959void
1960ev_default_fork (void)
1961{
1962#if EV_MULTIPLICITY
1963 EV_P = ev_default_loop_ptr;
1964#endif
1965
1966 postfork = 1; /* must be in line with ev_loop_fork */
1967}
1968
1969/*****************************************************************************/
1970
1971void
1972ev_invoke (EV_P_ void *w, int revents)
1973{
1974 EV_CB_INVOKE ((W)w, revents);
1975}
1976
1977unsigned int
1978ev_pending_count (EV_P)
1979{
1980 int pri;
1981 unsigned int count = 0;
1982
1983 for (pri = NUMPRI; pri--; )
1984 count += pendingcnt [pri];
1985
1986 return count;
1987}
1988
1989void noinline
1990ev_invoke_pending (EV_P)
1991{
1992 int pri;
1993
1994 for (pri = NUMPRI; pri--; )
1995 while (pendingcnt [pri])
1996 {
1997 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1998
1999 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
2000 /* ^ this is no longer true, as pending_w could be here */
2001
2002 p->w->pending = 0;
2003 EV_CB_INVOKE (p->w, p->events);
2004 EV_FREQUENT_CHECK;
2005 }
2006}
2007
2008#if EV_IDLE_ENABLE
2009/* make idle watchers pending. this handles the "call-idle */
2010/* only when higher priorities are idle" logic */
2011inline_size void
2012idle_reify (EV_P)
2013{
2014 if (expect_false (idleall))
2015 {
2016 int pri;
2017
2018 for (pri = NUMPRI; pri--; )
2019 {
2020 if (pendingcnt [pri])
2021 break;
2022
2023 if (idlecnt [pri])
2024 {
2025 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2026 break;
2027 }
2028 }
2029 }
2030}
2031#endif
2032
2033/* make timers pending */
2034inline_size void
2035timers_reify (EV_P)
2036{
2037 EV_FREQUENT_CHECK;
2038
2039 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2040 {
2041 do
2042 {
2043 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2044
2045 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2046
371 /* first reschedule or stop timer */ 2047 /* first reschedule or stop timer */
2048 if (w->repeat)
2049 {
2050 ev_at (w) += w->repeat;
2051 if (ev_at (w) < mn_now)
2052 ev_at (w) = mn_now;
2053
2054 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2055
2056 ANHE_at_cache (timers [HEAP0]);
2057 downheap (timers, timercnt, HEAP0);
2058 }
2059 else
2060 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2061
2062 EV_FREQUENT_CHECK;
2063 feed_reverse (EV_A_ (W)w);
2064 }
2065 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2066
2067 feed_reverse_done (EV_A_ EV_TIMEOUT);
2068 }
2069}
2070
2071#if EV_PERIODIC_ENABLE
2072/* make periodics pending */
2073inline_size void
2074periodics_reify (EV_P)
2075{
2076 EV_FREQUENT_CHECK;
2077
2078 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2079 {
2080 int feed_count = 0;
2081
2082 do
2083 {
2084 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2085
2086 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2087
2088 /* first reschedule or stop timer */
2089 if (w->reschedule_cb)
2090 {
2091 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2092
2093 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2094
2095 ANHE_at_cache (periodics [HEAP0]);
2096 downheap (periodics, periodiccnt, HEAP0);
2097 }
2098 else if (w->interval)
2099 {
2100 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2101 /* if next trigger time is not sufficiently in the future, put it there */
2102 /* this might happen because of floating point inexactness */
2103 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2104 {
2105 ev_at (w) += w->interval;
2106
2107 /* if interval is unreasonably low we might still have a time in the past */
2108 /* so correct this. this will make the periodic very inexact, but the user */
2109 /* has effectively asked to get triggered more often than possible */
2110 if (ev_at (w) < ev_rt_now)
2111 ev_at (w) = ev_rt_now;
2112 }
2113
2114 ANHE_at_cache (periodics [HEAP0]);
2115 downheap (periodics, periodiccnt, HEAP0);
2116 }
2117 else
2118 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2119
2120 EV_FREQUENT_CHECK;
2121 feed_reverse (EV_A_ (W)w);
2122 }
2123 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2124
2125 feed_reverse_done (EV_A_ EV_PERIODIC);
2126 }
2127}
2128
2129/* simply recalculate all periodics */
2130/* TODO: maybe ensure that at leats one event happens when jumping forward? */
2131static void noinline
2132periodics_reschedule (EV_P)
2133{
2134 int i;
2135
2136 /* adjust periodics after time jump */
2137 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2138 {
2139 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2140
2141 if (w->reschedule_cb)
2142 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2143 else if (w->interval)
2144 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2145
2146 ANHE_at_cache (periodics [i]);
2147 }
2148
2149 reheap (periodics, periodiccnt);
2150}
2151#endif
2152
2153/* adjust all timers by a given offset */
2154static void noinline
2155timers_reschedule (EV_P_ ev_tstamp adjust)
2156{
2157 int i;
2158
2159 for (i = 0; i < timercnt; ++i)
2160 {
2161 ANHE *he = timers + i + HEAP0;
2162 ANHE_w (*he)->at += adjust;
2163 ANHE_at_cache (*he);
2164 }
2165}
2166
2167/* fetch new monotonic and realtime times from the kernel */
2168/* also detect if there was a timejump, and act accordingly */
2169inline_speed void
2170time_update (EV_P_ ev_tstamp max_block)
2171{
2172#if EV_USE_MONOTONIC
2173 if (expect_true (have_monotonic))
2174 {
2175 int i;
2176 ev_tstamp odiff = rtmn_diff;
2177
2178 mn_now = get_clock ();
2179
2180 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2181 /* interpolate in the meantime */
2182 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2183 {
2184 ev_rt_now = rtmn_diff + mn_now;
2185 return;
2186 }
2187
2188 now_floor = mn_now;
2189 ev_rt_now = ev_time ();
2190
2191 /* loop a few times, before making important decisions.
2192 * on the choice of "4": one iteration isn't enough,
2193 * in case we get preempted during the calls to
2194 * ev_time and get_clock. a second call is almost guaranteed
2195 * to succeed in that case, though. and looping a few more times
2196 * doesn't hurt either as we only do this on time-jumps or
2197 * in the unlikely event of having been preempted here.
2198 */
2199 for (i = 4; --i; )
2200 {
2201 rtmn_diff = ev_rt_now - mn_now;
2202
2203 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2204 return; /* all is well */
2205
2206 ev_rt_now = ev_time ();
2207 mn_now = get_clock ();
2208 now_floor = mn_now;
2209 }
2210
2211 /* no timer adjustment, as the monotonic clock doesn't jump */
2212 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2213# if EV_PERIODIC_ENABLE
2214 periodics_reschedule (EV_A);
2215# endif
2216 }
2217 else
2218#endif
2219 {
2220 ev_rt_now = ev_time ();
2221
2222 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2223 {
2224 /* adjust timers. this is easy, as the offset is the same for all of them */
2225 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2226#if EV_PERIODIC_ENABLE
2227 periodics_reschedule (EV_A);
2228#endif
2229 }
2230
2231 mn_now = ev_rt_now;
2232 }
2233}
2234
2235void
2236ev_loop (EV_P_ int flags)
2237{
2238#if EV_MINIMAL < 2
2239 ++loop_depth;
2240#endif
2241
2242 assert (("libev: ev_loop recursion during release detected", loop_done != EVUNLOOP_RECURSE));
2243
2244 loop_done = EVUNLOOP_CANCEL;
2245
2246 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2247
2248 do
2249 {
2250#if EV_VERIFY >= 2
2251 ev_loop_verify (EV_A);
2252#endif
2253
2254#ifndef _WIN32
2255 if (expect_false (curpid)) /* penalise the forking check even more */
2256 if (expect_false (getpid () != curpid))
2257 {
2258 curpid = getpid ();
2259 postfork = 1;
2260 }
2261#endif
2262
2263#if EV_FORK_ENABLE
2264 /* we might have forked, so queue fork handlers */
2265 if (expect_false (postfork))
2266 if (forkcnt)
2267 {
2268 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2269 EV_INVOKE_PENDING;
2270 }
2271#endif
2272
2273 /* queue prepare watchers (and execute them) */
2274 if (expect_false (preparecnt))
2275 {
2276 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2277 EV_INVOKE_PENDING;
2278 }
2279
2280 if (expect_false (loop_done))
2281 break;
2282
2283 /* we might have forked, so reify kernel state if necessary */
2284 if (expect_false (postfork))
2285 loop_fork (EV_A);
2286
2287 /* update fd-related kernel structures */
2288 fd_reify (EV_A);
2289
2290 /* calculate blocking time */
2291 {
2292 ev_tstamp waittime = 0.;
2293 ev_tstamp sleeptime = 0.;
2294
2295 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
2296 {
2297 /* remember old timestamp for io_blocktime calculation */
2298 ev_tstamp prev_mn_now = mn_now;
2299
2300 /* update time to cancel out callback processing overhead */
2301 time_update (EV_A_ 1e100);
2302
2303 waittime = MAX_BLOCKTIME;
2304
2305 if (timercnt)
2306 {
2307 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2308 if (waittime > to) waittime = to;
2309 }
2310
2311#if EV_PERIODIC_ENABLE
2312 if (periodiccnt)
2313 {
2314 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2315 if (waittime > to) waittime = to;
2316 }
2317#endif
2318
2319 /* don't let timeouts decrease the waittime below timeout_blocktime */
2320 if (expect_false (waittime < timeout_blocktime))
2321 waittime = timeout_blocktime;
2322
2323 /* extra check because io_blocktime is commonly 0 */
2324 if (expect_false (io_blocktime))
2325 {
2326 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2327
2328 if (sleeptime > waittime - backend_fudge)
2329 sleeptime = waittime - backend_fudge;
2330
2331 if (expect_true (sleeptime > 0.))
2332 {
2333 ev_sleep (sleeptime);
2334 waittime -= sleeptime;
2335 }
2336 }
2337 }
2338
2339#if EV_MINIMAL < 2
2340 ++loop_count;
2341#endif
2342 assert ((loop_done = EVUNLOOP_RECURSE, 1)); /* assert for side effect */
2343 backend_poll (EV_A_ waittime);
2344 assert ((loop_done = EVUNLOOP_CANCEL, 1)); /* assert for side effect */
2345
2346 /* update ev_rt_now, do magic */
2347 time_update (EV_A_ waittime + sleeptime);
2348 }
2349
2350 /* queue pending timers and reschedule them */
2351 timers_reify (EV_A); /* relative timers called last */
2352#if EV_PERIODIC_ENABLE
2353 periodics_reify (EV_A); /* absolute timers called first */
2354#endif
2355
2356#if EV_IDLE_ENABLE
2357 /* queue idle watchers unless other events are pending */
2358 idle_reify (EV_A);
2359#endif
2360
2361 /* queue check watchers, to be executed first */
2362 if (expect_false (checkcnt))
2363 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2364
2365 EV_INVOKE_PENDING;
2366 }
2367 while (expect_true (
2368 activecnt
2369 && !loop_done
2370 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2371 ));
2372
2373 if (loop_done == EVUNLOOP_ONE)
2374 loop_done = EVUNLOOP_CANCEL;
2375
2376#if EV_MINIMAL < 2
2377 --loop_depth;
2378#endif
2379}
2380
2381void
2382ev_unloop (EV_P_ int how)
2383{
2384 loop_done = how;
2385}
2386
2387void
2388ev_ref (EV_P)
2389{
2390 ++activecnt;
2391}
2392
2393void
2394ev_unref (EV_P)
2395{
2396 --activecnt;
2397}
2398
2399void
2400ev_now_update (EV_P)
2401{
2402 time_update (EV_A_ 1e100);
2403}
2404
2405void
2406ev_suspend (EV_P)
2407{
2408 ev_now_update (EV_A);
2409}
2410
2411void
2412ev_resume (EV_P)
2413{
2414 ev_tstamp mn_prev = mn_now;
2415
2416 ev_now_update (EV_A);
2417 timers_reschedule (EV_A_ mn_now - mn_prev);
2418#if EV_PERIODIC_ENABLE
2419 /* TODO: really do this? */
2420 periodics_reschedule (EV_A);
2421#endif
2422}
2423
2424/*****************************************************************************/
2425/* singly-linked list management, used when the expected list length is short */
2426
2427inline_size void
2428wlist_add (WL *head, WL elem)
2429{
2430 elem->next = *head;
2431 *head = elem;
2432}
2433
2434inline_size void
2435wlist_del (WL *head, WL elem)
2436{
2437 while (*head)
2438 {
2439 if (expect_true (*head == elem))
2440 {
2441 *head = elem->next;
2442 break;
2443 }
2444
2445 head = &(*head)->next;
2446 }
2447}
2448
2449/* internal, faster, version of ev_clear_pending */
2450inline_speed void
2451clear_pending (EV_P_ W w)
2452{
2453 if (w->pending)
2454 {
2455 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2456 w->pending = 0;
2457 }
2458}
2459
2460int
2461ev_clear_pending (EV_P_ void *w)
2462{
2463 W w_ = (W)w;
2464 int pending = w_->pending;
2465
2466 if (expect_true (pending))
2467 {
2468 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2469 p->w = (W)&pending_w;
2470 w_->pending = 0;
2471 return p->events;
2472 }
2473 else
2474 return 0;
2475}
2476
2477inline_size void
2478pri_adjust (EV_P_ W w)
2479{
2480 int pri = ev_priority (w);
2481 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2482 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2483 ev_set_priority (w, pri);
2484}
2485
2486inline_speed void
2487ev_start (EV_P_ W w, int active)
2488{
2489 pri_adjust (EV_A_ w);
2490 w->active = active;
2491 ev_ref (EV_A);
2492}
2493
2494inline_size void
2495ev_stop (EV_P_ W w)
2496{
2497 ev_unref (EV_A);
2498 w->active = 0;
2499}
2500
2501/*****************************************************************************/
2502
2503void noinline
2504ev_io_start (EV_P_ ev_io *w)
2505{
2506 int fd = w->fd;
2507
2508 if (expect_false (ev_is_active (w)))
2509 return;
2510
2511 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2512 assert (("libev: ev_io start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2513
2514 EV_FREQUENT_CHECK;
2515
2516 ev_start (EV_A_ (W)w, 1);
2517 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2518 wlist_add (&anfds[fd].head, (WL)w);
2519
2520 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2521 w->events &= ~EV__IOFDSET;
2522
2523 EV_FREQUENT_CHECK;
2524}
2525
2526void noinline
2527ev_io_stop (EV_P_ ev_io *w)
2528{
2529 clear_pending (EV_A_ (W)w);
2530 if (expect_false (!ev_is_active (w)))
2531 return;
2532
2533 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2534
2535 EV_FREQUENT_CHECK;
2536
2537 wlist_del (&anfds[w->fd].head, (WL)w);
2538 ev_stop (EV_A_ (W)w);
2539
2540 fd_change (EV_A_ w->fd, 1);
2541
2542 EV_FREQUENT_CHECK;
2543}
2544
2545void noinline
2546ev_timer_start (EV_P_ ev_timer *w)
2547{
2548 if (expect_false (ev_is_active (w)))
2549 return;
2550
2551 ev_at (w) += mn_now;
2552
2553 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2554
2555 EV_FREQUENT_CHECK;
2556
2557 ++timercnt;
2558 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2559 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2560 ANHE_w (timers [ev_active (w)]) = (WT)w;
2561 ANHE_at_cache (timers [ev_active (w)]);
2562 upheap (timers, ev_active (w));
2563
2564 EV_FREQUENT_CHECK;
2565
2566 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2567}
2568
2569void noinline
2570ev_timer_stop (EV_P_ ev_timer *w)
2571{
2572 clear_pending (EV_A_ (W)w);
2573 if (expect_false (!ev_is_active (w)))
2574 return;
2575
2576 EV_FREQUENT_CHECK;
2577
2578 {
2579 int active = ev_active (w);
2580
2581 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2582
2583 --timercnt;
2584
2585 if (expect_true (active < timercnt + HEAP0))
2586 {
2587 timers [active] = timers [timercnt + HEAP0];
2588 adjustheap (timers, timercnt, active);
2589 }
2590 }
2591
2592 EV_FREQUENT_CHECK;
2593
2594 ev_at (w) -= mn_now;
2595
2596 ev_stop (EV_A_ (W)w);
2597}
2598
2599void noinline
2600ev_timer_again (EV_P_ ev_timer *w)
2601{
2602 EV_FREQUENT_CHECK;
2603
2604 if (ev_is_active (w))
2605 {
372 if (w->repeat) 2606 if (w->repeat)
373 { 2607 {
374 if (w->is_abs)
375 w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
376 else
377 w->at = now + w->repeat; 2608 ev_at (w) = mn_now + w->repeat;
378 2609 ANHE_at_cache (timers [ev_active (w)]);
379 assert (w->at > now);
380
381 downheap (timers, timercnt, 0); 2610 adjustheap (timers, timercnt, ev_active (w));
382 } 2611 }
383 else 2612 else
2613 ev_timer_stop (EV_A_ w);
2614 }
2615 else if (w->repeat)
2616 {
2617 ev_at (w) = w->repeat;
2618 ev_timer_start (EV_A_ w);
2619 }
2620
2621 EV_FREQUENT_CHECK;
2622}
2623
2624ev_tstamp
2625ev_timer_remaining (EV_P_ ev_timer *w)
2626{
2627 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2628}
2629
2630#if EV_PERIODIC_ENABLE
2631void noinline
2632ev_periodic_start (EV_P_ ev_periodic *w)
2633{
2634 if (expect_false (ev_is_active (w)))
2635 return;
2636
2637 if (w->reschedule_cb)
2638 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2639 else if (w->interval)
2640 {
2641 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2642 /* this formula differs from the one in periodic_reify because we do not always round up */
2643 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2644 }
2645 else
2646 ev_at (w) = w->offset;
2647
2648 EV_FREQUENT_CHECK;
2649
2650 ++periodiccnt;
2651 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2652 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2653 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2654 ANHE_at_cache (periodics [ev_active (w)]);
2655 upheap (periodics, ev_active (w));
2656
2657 EV_FREQUENT_CHECK;
2658
2659 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2660}
2661
2662void noinline
2663ev_periodic_stop (EV_P_ ev_periodic *w)
2664{
2665 clear_pending (EV_A_ (W)w);
2666 if (expect_false (!ev_is_active (w)))
2667 return;
2668
2669 EV_FREQUENT_CHECK;
2670
2671 {
2672 int active = ev_active (w);
2673
2674 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2675
2676 --periodiccnt;
2677
2678 if (expect_true (active < periodiccnt + HEAP0))
2679 {
2680 periodics [active] = periodics [periodiccnt + HEAP0];
2681 adjustheap (periodics, periodiccnt, active);
2682 }
2683 }
2684
2685 EV_FREQUENT_CHECK;
2686
2687 ev_stop (EV_A_ (W)w);
2688}
2689
2690void noinline
2691ev_periodic_again (EV_P_ ev_periodic *w)
2692{
2693 /* TODO: use adjustheap and recalculation */
2694 ev_periodic_stop (EV_A_ w);
2695 ev_periodic_start (EV_A_ w);
2696}
2697#endif
2698
2699#ifndef SA_RESTART
2700# define SA_RESTART 0
2701#endif
2702
2703void noinline
2704ev_signal_start (EV_P_ ev_signal *w)
2705{
2706 if (expect_false (ev_is_active (w)))
2707 return;
2708
2709 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2710
2711#if EV_MULTIPLICITY
2712 assert (("libev: a signal must not be attached to two different loops",
2713 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2714
2715 signals [w->signum - 1].loop = EV_A;
2716#endif
2717
2718 EV_FREQUENT_CHECK;
2719
2720#if EV_USE_SIGNALFD
2721 if (sigfd == -2)
2722 {
2723 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2724 if (sigfd < 0 && errno == EINVAL)
2725 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2726
2727 if (sigfd >= 0)
384 { 2728 {
385 evtimer_stop (w); /* nonrepeating: stop timer */ 2729 fd_intern (sigfd); /* doing it twice will not hurt */
386 --timercnt; /* maybe pass by reference instead? */ 2730
2731 sigemptyset (&sigfd_set);
2732
2733 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2734 ev_set_priority (&sigfd_w, EV_MAXPRI);
2735 ev_io_start (EV_A_ &sigfd_w);
2736 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
387 } 2737 }
2738 }
388 2739
389 event ((struct ev_watcher *)w, EV_TIMEOUT); 2740 if (sigfd >= 0)
2741 {
2742 /* TODO: check .head */
2743 sigaddset (&sigfd_set, w->signum);
2744 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2745
2746 signalfd (sigfd, &sigfd_set, 0);
2747 }
2748#endif
2749
2750 ev_start (EV_A_ (W)w, 1);
2751 wlist_add (&signals [w->signum - 1].head, (WL)w);
2752
2753 if (!((WL)w)->next)
2754# if EV_USE_SIGNALFD
2755 if (sigfd < 0) /*TODO*/
2756# endif
2757 {
2758# ifdef _WIN32
2759 evpipe_init (EV_A);
2760
2761 signal (w->signum, ev_sighandler);
2762# else
2763 struct sigaction sa;
2764
2765 evpipe_init (EV_A);
2766
2767 sa.sa_handler = ev_sighandler;
2768 sigfillset (&sa.sa_mask);
2769 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2770 sigaction (w->signum, &sa, 0);
2771
2772 sigemptyset (&sa.sa_mask);
2773 sigaddset (&sa.sa_mask, w->signum);
2774 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2775#endif
2776 }
2777
2778 EV_FREQUENT_CHECK;
2779}
2780
2781void noinline
2782ev_signal_stop (EV_P_ ev_signal *w)
2783{
2784 clear_pending (EV_A_ (W)w);
2785 if (expect_false (!ev_is_active (w)))
2786 return;
2787
2788 EV_FREQUENT_CHECK;
2789
2790 wlist_del (&signals [w->signum - 1].head, (WL)w);
2791 ev_stop (EV_A_ (W)w);
2792
2793 if (!signals [w->signum - 1].head)
2794 {
2795#if EV_MULTIPLICITY
2796 signals [w->signum - 1].loop = 0; /* unattach from signal */
2797#endif
2798#if EV_USE_SIGNALFD
2799 if (sigfd >= 0)
2800 {
2801 sigset_t ss;
2802
2803 sigemptyset (&ss);
2804 sigaddset (&ss, w->signum);
2805 sigdelset (&sigfd_set, w->signum);
2806
2807 signalfd (sigfd, &sigfd_set, 0);
2808 sigprocmask (SIG_UNBLOCK, &ss, 0);
2809 }
2810 else
2811#endif
2812 signal (w->signum, SIG_DFL);
2813 }
2814
2815 EV_FREQUENT_CHECK;
2816}
2817
2818void
2819ev_child_start (EV_P_ ev_child *w)
2820{
2821#if EV_MULTIPLICITY
2822 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2823#endif
2824 if (expect_false (ev_is_active (w)))
2825 return;
2826
2827 EV_FREQUENT_CHECK;
2828
2829 ev_start (EV_A_ (W)w, 1);
2830 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2831
2832 EV_FREQUENT_CHECK;
2833}
2834
2835void
2836ev_child_stop (EV_P_ ev_child *w)
2837{
2838 clear_pending (EV_A_ (W)w);
2839 if (expect_false (!ev_is_active (w)))
2840 return;
2841
2842 EV_FREQUENT_CHECK;
2843
2844 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2845 ev_stop (EV_A_ (W)w);
2846
2847 EV_FREQUENT_CHECK;
2848}
2849
2850#if EV_STAT_ENABLE
2851
2852# ifdef _WIN32
2853# undef lstat
2854# define lstat(a,b) _stati64 (a,b)
2855# endif
2856
2857#define DEF_STAT_INTERVAL 5.0074891
2858#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2859#define MIN_STAT_INTERVAL 0.1074891
2860
2861static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2862
2863#if EV_USE_INOTIFY
2864# define EV_INOTIFY_BUFSIZE 8192
2865
2866static void noinline
2867infy_add (EV_P_ ev_stat *w)
2868{
2869 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);
2870
2871 if (w->wd >= 0)
2872 {
2873 struct statfs sfs;
2874
2875 /* now local changes will be tracked by inotify, but remote changes won't */
2876 /* unless the filesystem is known to be local, we therefore still poll */
2877 /* also do poll on <2.6.25, but with normal frequency */
2878
2879 if (!fs_2625)
2880 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2881 else if (!statfs (w->path, &sfs)
2882 && (sfs.f_type == 0x1373 /* devfs */
2883 || sfs.f_type == 0xEF53 /* ext2/3 */
2884 || sfs.f_type == 0x3153464a /* jfs */
2885 || sfs.f_type == 0x52654973 /* reiser3 */
2886 || sfs.f_type == 0x01021994 /* tempfs */
2887 || sfs.f_type == 0x58465342 /* xfs */))
2888 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
2889 else
2890 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
2891 }
2892 else
2893 {
2894 /* can't use inotify, continue to stat */
2895 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2896
2897 /* if path is not there, monitor some parent directory for speedup hints */
2898 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2899 /* but an efficiency issue only */
2900 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2901 {
2902 char path [4096];
2903 strcpy (path, w->path);
2904
2905 do
2906 {
2907 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2908 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2909
2910 char *pend = strrchr (path, '/');
2911
2912 if (!pend || pend == path)
2913 break;
2914
2915 *pend = 0;
2916 w->wd = inotify_add_watch (fs_fd, path, mask);
2917 }
2918 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2919 }
2920 }
2921
2922 if (w->wd >= 0)
2923 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2924
2925 /* now re-arm timer, if required */
2926 if (ev_is_active (&w->timer)) ev_ref (EV_A);
2927 ev_timer_again (EV_A_ &w->timer);
2928 if (ev_is_active (&w->timer)) ev_unref (EV_A);
2929}
2930
2931static void noinline
2932infy_del (EV_P_ ev_stat *w)
2933{
2934 int slot;
2935 int wd = w->wd;
2936
2937 if (wd < 0)
2938 return;
2939
2940 w->wd = -2;
2941 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2942 wlist_del (&fs_hash [slot].head, (WL)w);
2943
2944 /* remove this watcher, if others are watching it, they will rearm */
2945 inotify_rm_watch (fs_fd, wd);
2946}
2947
2948static void noinline
2949infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2950{
2951 if (slot < 0)
2952 /* overflow, need to check for all hash slots */
2953 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2954 infy_wd (EV_A_ slot, wd, ev);
2955 else
2956 {
2957 WL w_;
2958
2959 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2960 {
2961 ev_stat *w = (ev_stat *)w_;
2962 w_ = w_->next; /* lets us remove this watcher and all before it */
2963
2964 if (w->wd == wd || wd == -1)
2965 {
2966 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2967 {
2968 wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2969 w->wd = -1;
2970 infy_add (EV_A_ w); /* re-add, no matter what */
2971 }
2972
2973 stat_timer_cb (EV_A_ &w->timer, 0);
2974 }
2975 }
390 } 2976 }
391} 2977}
392 2978
393static void 2979static void
394time_update () 2980infy_cb (EV_P_ ev_io *w, int revents)
395{ 2981{
2982 char buf [EV_INOTIFY_BUFSIZE];
2983 struct inotify_event *ev = (struct inotify_event *)buf;
396 int i; 2984 int ofs;
397 ev_now = ev_time (); 2985 int len = read (fs_fd, buf, sizeof (buf));
398 2986
399 if (have_monotonic) 2987 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2988 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2989}
2990
2991inline_size void
2992check_2625 (EV_P)
2993{
2994 /* kernels < 2.6.25 are borked
2995 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
2996 */
2997 struct utsname buf;
2998 int major, minor, micro;
2999
3000 if (uname (&buf))
3001 return;
3002
3003 if (sscanf (buf.release, "%d.%d.%d", &major, &minor, &micro) != 3)
3004 return;
3005
3006 if (major < 2
3007 || (major == 2 && minor < 6)
3008 || (major == 2 && minor == 6 && micro < 25))
3009 return;
3010
3011 fs_2625 = 1;
3012}
3013
3014inline_size int
3015infy_newfd (void)
3016{
3017#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3018 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3019 if (fd >= 0)
3020 return fd;
3021#endif
3022 return inotify_init ();
3023}
3024
3025inline_size void
3026infy_init (EV_P)
3027{
3028 if (fs_fd != -2)
3029 return;
3030
3031 fs_fd = -1;
3032
3033 check_2625 (EV_A);
3034
3035 fs_fd = infy_newfd ();
3036
3037 if (fs_fd >= 0)
3038 {
3039 fd_intern (fs_fd);
3040 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3041 ev_set_priority (&fs_w, EV_MAXPRI);
3042 ev_io_start (EV_A_ &fs_w);
3043 ev_unref (EV_A);
400 { 3044 }
401 ev_tstamp odiff = diff; 3045}
402 3046
403 /* detecting time jumps is much more difficult */ 3047inline_size void
404 for (i = 2; --i; ) /* loop a few times, before making important decisions */ 3048infy_fork (EV_P)
3049{
3050 int slot;
3051
3052 if (fs_fd < 0)
3053 return;
3054
3055 ev_ref (EV_A);
3056 ev_io_stop (EV_A_ &fs_w);
3057 close (fs_fd);
3058 fs_fd = infy_newfd ();
3059
3060 if (fs_fd >= 0)
3061 {
3062 fd_intern (fs_fd);
3063 ev_io_set (&fs_w, fs_fd, EV_READ);
3064 ev_io_start (EV_A_ &fs_w);
3065 ev_unref (EV_A);
3066 }
3067
3068 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
3069 {
3070 WL w_ = fs_hash [slot].head;
3071 fs_hash [slot].head = 0;
3072
3073 while (w_)
405 { 3074 {
406 now = get_clock (); 3075 ev_stat *w = (ev_stat *)w_;
407 diff = ev_now - now; 3076 w_ = w_->next; /* lets us add this watcher */
408 3077
409 if (fabs (odiff - diff) < MIN_TIMEJUMP) 3078 w->wd = -1;
410 return; /* all is well */
411 3079
412 ev_now = ev_time (); 3080 if (fs_fd >= 0)
3081 infy_add (EV_A_ w); /* re-add, no matter what */
3082 else
3083 {
3084 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3085 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3086 ev_timer_again (EV_A_ &w->timer);
3087 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3088 }
413 } 3089 }
3090 }
3091}
414 3092
415 /* time jump detected, reschedule atimers */ 3093#endif
3094
3095#ifdef _WIN32
3096# define EV_LSTAT(p,b) _stati64 (p, b)
3097#else
3098# define EV_LSTAT(p,b) lstat (p, b)
3099#endif
3100
3101void
3102ev_stat_stat (EV_P_ ev_stat *w)
3103{
3104 if (lstat (w->path, &w->attr) < 0)
3105 w->attr.st_nlink = 0;
3106 else if (!w->attr.st_nlink)
3107 w->attr.st_nlink = 1;
3108}
3109
3110static void noinline
3111stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3112{
3113 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3114
3115 ev_statdata prev = w->attr;
3116 ev_stat_stat (EV_A_ w);
3117
3118 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3119 if (
3120 prev.st_dev != w->attr.st_dev
3121 || prev.st_ino != w->attr.st_ino
3122 || prev.st_mode != w->attr.st_mode
3123 || prev.st_nlink != w->attr.st_nlink
3124 || prev.st_uid != w->attr.st_uid
3125 || prev.st_gid != w->attr.st_gid
3126 || prev.st_rdev != w->attr.st_rdev
3127 || prev.st_size != w->attr.st_size
3128 || prev.st_atime != w->attr.st_atime
3129 || prev.st_mtime != w->attr.st_mtime
3130 || prev.st_ctime != w->attr.st_ctime
3131 ) {
3132 /* we only update w->prev on actual differences */
3133 /* in case we test more often than invoke the callback, */
3134 /* to ensure that prev is always different to attr */
3135 w->prev = prev;
3136
3137 #if EV_USE_INOTIFY
3138 if (fs_fd >= 0)
3139 {
3140 infy_del (EV_A_ w);
3141 infy_add (EV_A_ w);
3142 ev_stat_stat (EV_A_ w); /* avoid race... */
3143 }
3144 #endif
3145
3146 ev_feed_event (EV_A_ w, EV_STAT);
3147 }
3148}
3149
3150void
3151ev_stat_start (EV_P_ ev_stat *w)
3152{
3153 if (expect_false (ev_is_active (w)))
3154 return;
3155
3156 ev_stat_stat (EV_A_ w);
3157
3158 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3159 w->interval = MIN_STAT_INTERVAL;
3160
3161 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3162 ev_set_priority (&w->timer, ev_priority (w));
3163
3164#if EV_USE_INOTIFY
3165 infy_init (EV_A);
3166
3167 if (fs_fd >= 0)
3168 infy_add (EV_A_ w);
3169 else
3170#endif
3171 {
3172 ev_timer_again (EV_A_ &w->timer);
3173 ev_unref (EV_A);
3174 }
3175
3176 ev_start (EV_A_ (W)w, 1);
3177
3178 EV_FREQUENT_CHECK;
3179}
3180
3181void
3182ev_stat_stop (EV_P_ ev_stat *w)
3183{
3184 clear_pending (EV_A_ (W)w);
3185 if (expect_false (!ev_is_active (w)))
3186 return;
3187
3188 EV_FREQUENT_CHECK;
3189
3190#if EV_USE_INOTIFY
3191 infy_del (EV_A_ w);
3192#endif
3193
3194 if (ev_is_active (&w->timer))
3195 {
3196 ev_ref (EV_A);
3197 ev_timer_stop (EV_A_ &w->timer);
3198 }
3199
3200 ev_stop (EV_A_ (W)w);
3201
3202 EV_FREQUENT_CHECK;
3203}
3204#endif
3205
3206#if EV_IDLE_ENABLE
3207void
3208ev_idle_start (EV_P_ ev_idle *w)
3209{
3210 if (expect_false (ev_is_active (w)))
3211 return;
3212
3213 pri_adjust (EV_A_ (W)w);
3214
3215 EV_FREQUENT_CHECK;
3216
3217 {
3218 int active = ++idlecnt [ABSPRI (w)];
3219
3220 ++idleall;
3221 ev_start (EV_A_ (W)w, active);
3222
3223 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3224 idles [ABSPRI (w)][active - 1] = w;
3225 }
3226
3227 EV_FREQUENT_CHECK;
3228}
3229
3230void
3231ev_idle_stop (EV_P_ ev_idle *w)
3232{
3233 clear_pending (EV_A_ (W)w);
3234 if (expect_false (!ev_is_active (w)))
3235 return;
3236
3237 EV_FREQUENT_CHECK;
3238
3239 {
3240 int active = ev_active (w);
3241
3242 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3243 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3244
3245 ev_stop (EV_A_ (W)w);
3246 --idleall;
3247 }
3248
3249 EV_FREQUENT_CHECK;
3250}
3251#endif
3252
3253void
3254ev_prepare_start (EV_P_ ev_prepare *w)
3255{
3256 if (expect_false (ev_is_active (w)))
3257 return;
3258
3259 EV_FREQUENT_CHECK;
3260
3261 ev_start (EV_A_ (W)w, ++preparecnt);
3262 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3263 prepares [preparecnt - 1] = w;
3264
3265 EV_FREQUENT_CHECK;
3266}
3267
3268void
3269ev_prepare_stop (EV_P_ ev_prepare *w)
3270{
3271 clear_pending (EV_A_ (W)w);
3272 if (expect_false (!ev_is_active (w)))
3273 return;
3274
3275 EV_FREQUENT_CHECK;
3276
3277 {
3278 int active = ev_active (w);
3279
3280 prepares [active - 1] = prepares [--preparecnt];
3281 ev_active (prepares [active - 1]) = active;
3282 }
3283
3284 ev_stop (EV_A_ (W)w);
3285
3286 EV_FREQUENT_CHECK;
3287}
3288
3289void
3290ev_check_start (EV_P_ ev_check *w)
3291{
3292 if (expect_false (ev_is_active (w)))
3293 return;
3294
3295 EV_FREQUENT_CHECK;
3296
3297 ev_start (EV_A_ (W)w, ++checkcnt);
3298 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3299 checks [checkcnt - 1] = w;
3300
3301 EV_FREQUENT_CHECK;
3302}
3303
3304void
3305ev_check_stop (EV_P_ ev_check *w)
3306{
3307 clear_pending (EV_A_ (W)w);
3308 if (expect_false (!ev_is_active (w)))
3309 return;
3310
3311 EV_FREQUENT_CHECK;
3312
3313 {
3314 int active = ev_active (w);
3315
3316 checks [active - 1] = checks [--checkcnt];
3317 ev_active (checks [active - 1]) = active;
3318 }
3319
3320 ev_stop (EV_A_ (W)w);
3321
3322 EV_FREQUENT_CHECK;
3323}
3324
3325#if EV_EMBED_ENABLE
3326void noinline
3327ev_embed_sweep (EV_P_ ev_embed *w)
3328{
3329 ev_loop (w->other, EVLOOP_NONBLOCK);
3330}
3331
3332static void
3333embed_io_cb (EV_P_ ev_io *io, int revents)
3334{
3335 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3336
3337 if (ev_cb (w))
3338 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3339 else
3340 ev_loop (w->other, EVLOOP_NONBLOCK);
3341}
3342
3343static void
3344embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3345{
3346 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3347
3348 {
3349 EV_P = w->other;
3350
3351 while (fdchangecnt)
3352 {
3353 fd_reify (EV_A);
3354 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3355 }
3356 }
3357}
3358
3359static void
3360embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3361{
3362 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3363
3364 ev_embed_stop (EV_A_ w);
3365
3366 {
3367 EV_P = w->other;
3368
3369 ev_loop_fork (EV_A);
3370 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3371 }
3372
3373 ev_embed_start (EV_A_ w);
3374}
3375
3376#if 0
3377static void
3378embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3379{
3380 ev_idle_stop (EV_A_ idle);
3381}
3382#endif
3383
3384void
3385ev_embed_start (EV_P_ ev_embed *w)
3386{
3387 if (expect_false (ev_is_active (w)))
3388 return;
3389
3390 {
3391 EV_P = w->other;
3392 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3393 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3394 }
3395
3396 EV_FREQUENT_CHECK;
3397
3398 ev_set_priority (&w->io, ev_priority (w));
3399 ev_io_start (EV_A_ &w->io);
3400
3401 ev_prepare_init (&w->prepare, embed_prepare_cb);
3402 ev_set_priority (&w->prepare, EV_MINPRI);
3403 ev_prepare_start (EV_A_ &w->prepare);
3404
3405 ev_fork_init (&w->fork, embed_fork_cb);
3406 ev_fork_start (EV_A_ &w->fork);
3407
3408 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3409
3410 ev_start (EV_A_ (W)w, 1);
3411
3412 EV_FREQUENT_CHECK;
3413}
3414
3415void
3416ev_embed_stop (EV_P_ ev_embed *w)
3417{
3418 clear_pending (EV_A_ (W)w);
3419 if (expect_false (!ev_is_active (w)))
3420 return;
3421
3422 EV_FREQUENT_CHECK;
3423
3424 ev_io_stop (EV_A_ &w->io);
3425 ev_prepare_stop (EV_A_ &w->prepare);
3426 ev_fork_stop (EV_A_ &w->fork);
3427
3428 EV_FREQUENT_CHECK;
3429}
3430#endif
3431
3432#if EV_FORK_ENABLE
3433void
3434ev_fork_start (EV_P_ ev_fork *w)
3435{
3436 if (expect_false (ev_is_active (w)))
3437 return;
3438
3439 EV_FREQUENT_CHECK;
3440
3441 ev_start (EV_A_ (W)w, ++forkcnt);
3442 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3443 forks [forkcnt - 1] = w;
3444
3445 EV_FREQUENT_CHECK;
3446}
3447
3448void
3449ev_fork_stop (EV_P_ ev_fork *w)
3450{
3451 clear_pending (EV_A_ (W)w);
3452 if (expect_false (!ev_is_active (w)))
3453 return;
3454
3455 EV_FREQUENT_CHECK;
3456
3457 {
3458 int active = ev_active (w);
3459
3460 forks [active - 1] = forks [--forkcnt];
3461 ev_active (forks [active - 1]) = active;
3462 }
3463
3464 ev_stop (EV_A_ (W)w);
3465
3466 EV_FREQUENT_CHECK;
3467}
3468#endif
3469
3470#if EV_ASYNC_ENABLE
3471void
3472ev_async_start (EV_P_ ev_async *w)
3473{
3474 if (expect_false (ev_is_active (w)))
3475 return;
3476
3477 evpipe_init (EV_A);
3478
3479 EV_FREQUENT_CHECK;
3480
3481 ev_start (EV_A_ (W)w, ++asynccnt);
3482 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3483 asyncs [asynccnt - 1] = w;
3484
3485 EV_FREQUENT_CHECK;
3486}
3487
3488void
3489ev_async_stop (EV_P_ ev_async *w)
3490{
3491 clear_pending (EV_A_ (W)w);
3492 if (expect_false (!ev_is_active (w)))
3493 return;
3494
3495 EV_FREQUENT_CHECK;
3496
3497 {
3498 int active = ev_active (w);
3499
3500 asyncs [active - 1] = asyncs [--asynccnt];
3501 ev_active (asyncs [active - 1]) = active;
3502 }
3503
3504 ev_stop (EV_A_ (W)w);
3505
3506 EV_FREQUENT_CHECK;
3507}
3508
3509void
3510ev_async_send (EV_P_ ev_async *w)
3511{
3512 w->sent = 1;
3513 evpipe_write (EV_A_ &async_pending);
3514}
3515#endif
3516
3517/*****************************************************************************/
3518
3519struct ev_once
3520{
3521 ev_io io;
3522 ev_timer to;
3523 void (*cb)(int revents, void *arg);
3524 void *arg;
3525};
3526
3527static void
3528once_cb (EV_P_ struct ev_once *once, int revents)
3529{
3530 void (*cb)(int revents, void *arg) = once->cb;
3531 void *arg = once->arg;
3532
3533 ev_io_stop (EV_A_ &once->io);
3534 ev_timer_stop (EV_A_ &once->to);
3535 ev_free (once);
3536
3537 cb (revents, arg);
3538}
3539
3540static void
3541once_cb_io (EV_P_ ev_io *w, int revents)
3542{
3543 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3544
3545 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3546}
3547
3548static void
3549once_cb_to (EV_P_ ev_timer *w, int revents)
3550{
3551 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3552
3553 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3554}
3555
3556void
3557ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3558{
3559 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3560
3561 if (expect_false (!once))
3562 {
3563 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3564 return;
3565 }
3566
3567 once->cb = cb;
3568 once->arg = arg;
3569
3570 ev_init (&once->io, once_cb_io);
3571 if (fd >= 0)
3572 {
3573 ev_io_set (&once->io, fd, events);
3574 ev_io_start (EV_A_ &once->io);
3575 }
3576
3577 ev_init (&once->to, once_cb_to);
3578 if (timeout >= 0.)
3579 {
3580 ev_timer_set (&once->to, timeout, 0.);
3581 ev_timer_start (EV_A_ &once->to);
3582 }
3583}
3584
3585/*****************************************************************************/
3586
3587#if EV_WALK_ENABLE
3588void
3589ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3590{
3591 int i, j;
3592 ev_watcher_list *wl, *wn;
3593
3594 if (types & (EV_IO | EV_EMBED))
416 for (i = 0; i < atimercnt; ++i) 3595 for (i = 0; i < anfdmax; ++i)
3596 for (wl = anfds [i].head; wl; )
417 { 3597 {
418 struct ev_timer *w = atimers [i]; 3598 wn = wl->next;
419 w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat; 3599
3600#if EV_EMBED_ENABLE
3601 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3602 {
3603 if (types & EV_EMBED)
3604 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3605 }
3606 else
3607#endif
3608#if EV_USE_INOTIFY
3609 if (ev_cb ((ev_io *)wl) == infy_cb)
3610 ;
3611 else
3612#endif
3613 if ((ev_io *)wl != &pipe_w)
3614 if (types & EV_IO)
3615 cb (EV_A_ EV_IO, wl);
3616
3617 wl = wn;
420 } 3618 }
421 }
422 else
423 {
424 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425 /* time jump detected, adjust rtimers */
426 for (i = 0; i < rtimercnt; ++i)
427 rtimers [i]->at += ev_now - now;
428 3619
429 now = ev_now; 3620 if (types & (EV_TIMER | EV_STAT))
430 } 3621 for (i = timercnt + HEAP0; i-- > HEAP0; )
431} 3622#if EV_STAT_ENABLE
432 3623 /*TODO: timer is not always active*/
433int ev_loop_done; 3624 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
434 3625 {
435void ev_loop (int flags) 3626 if (types & EV_STAT)
436{ 3627 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
437 double block; 3628 }
438 ev_loop_done = flags & EVLOOP_ONESHOT;
439
440 do
441 {
442 /* update fd-related kernel structures */
443 fd_reify ();
444
445 /* calculate blocking time */
446 if (flags & EVLOOP_NONBLOCK)
447 block = 0.;
448 else 3629 else
3630#endif
3631 if (types & EV_TIMER)
3632 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3633
3634#if EV_PERIODIC_ENABLE
3635 if (types & EV_PERIODIC)
3636 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3637 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3638#endif
3639
3640#if EV_IDLE_ENABLE
3641 if (types & EV_IDLE)
3642 for (j = NUMPRI; i--; )
3643 for (i = idlecnt [j]; i--; )
3644 cb (EV_A_ EV_IDLE, idles [j][i]);
3645#endif
3646
3647#if EV_FORK_ENABLE
3648 if (types & EV_FORK)
3649 for (i = forkcnt; i--; )
3650 if (ev_cb (forks [i]) != embed_fork_cb)
3651 cb (EV_A_ EV_FORK, forks [i]);
3652#endif
3653
3654#if EV_ASYNC_ENABLE
3655 if (types & EV_ASYNC)
3656 for (i = asynccnt; i--; )
3657 cb (EV_A_ EV_ASYNC, asyncs [i]);
3658#endif
3659
3660 if (types & EV_PREPARE)
3661 for (i = preparecnt; i--; )
3662#if EV_EMBED_ENABLE
3663 if (ev_cb (prepares [i]) != embed_prepare_cb)
3664#endif
3665 cb (EV_A_ EV_PREPARE, prepares [i]);
3666
3667 if (types & EV_CHECK)
3668 for (i = checkcnt; i--; )
3669 cb (EV_A_ EV_CHECK, checks [i]);
3670
3671 if (types & EV_SIGNAL)
3672 for (i = 0; i < EV_NSIG - 1; ++i)
3673 for (wl = signals [i].head; wl; )
449 { 3674 {
450 block = MAX_BLOCKTIME; 3675 wn = wl->next;
451 3676 cb (EV_A_ EV_SIGNAL, wl);
452 if (rtimercnt) 3677 wl = wn;
453 {
454 ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;
455 if (block > to) block = to;
456 }
457
458 if (atimercnt)
459 {
460 ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;
461 if (block > to) block = to;
462 }
463
464 if (block < 0.) block = 0.;
465 } 3678 }
466 3679
467 method_poll (block); 3680 if (types & EV_CHILD)
468 3681 for (i = EV_PID_HASHSIZE; i--; )
469 /* update ev_now, do magic */ 3682 for (wl = childs [i]; wl; )
470 time_update ();
471
472 /* put pending timers into pendign queue and reschedule them */
473 /* absolute timers first */
474 timers_reify (atimers, atimercnt, ev_now);
475 /* relative timers second */
476 timers_reify (rtimers, rtimercnt, now);
477
478 call_pending ();
479 }
480 while (!ev_loop_done);
481}
482
483static void
484wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)
485{
486 elem->next = *head;
487 *head = elem;
488}
489
490static void
491wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)
492{
493 while (*head)
494 {
495 if (*head == elem)
496 { 3683 {
497 *head = elem->next; 3684 wn = wl->next;
498 return; 3685 cb (EV_A_ EV_CHILD, wl);
3686 wl = wn;
499 } 3687 }
500 3688/* EV_STAT 0x00001000 /* stat data changed */
501 head = &(*head)->next; 3689/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
502 }
503} 3690}
504
505static void
506ev_start (struct ev_watcher *w, int active)
507{
508 w->pending = 0;
509 w->active = active;
510}
511
512static void
513ev_stop (struct ev_watcher *w)
514{
515 if (w->pending)
516 pendings [w->pending - 1].w = 0;
517
518 w->active = 0;
519 /* nop */
520}
521
522void
523evio_start (struct ev_io *w)
524{
525 if (ev_is_active (w))
526 return;
527
528 int fd = w->fd;
529
530 ev_start ((struct ev_watcher *)w, 1);
531 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
532 wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
533
534 ++fdchangecnt;
535 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536 fdchanges [fdchangecnt - 1] = fd;
537}
538
539void
540evio_stop (struct ev_io *w)
541{
542 if (!ev_is_active (w))
543 return;
544
545 wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
546 ev_stop ((struct ev_watcher *)w);
547
548 ++fdchangecnt;
549 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550 fdchanges [fdchangecnt - 1] = w->fd;
551}
552
553void
554evtimer_start (struct ev_timer *w)
555{
556 if (ev_is_active (w))
557 return;
558
559 if (w->is_abs)
560 {
561 /* this formula differs from the one in timer_reify becuse we do not round up */
562 if (w->repeat)
563 w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
564
565 ev_start ((struct ev_watcher *)w, ++atimercnt);
566 array_needsize (atimers, atimermax, atimercnt, );
567 atimers [atimercnt - 1] = w;
568 upheap (atimers, atimercnt - 1);
569 }
570 else
571 {
572 w->at += now;
573
574 ev_start ((struct ev_watcher *)w, ++rtimercnt);
575 array_needsize (rtimers, rtimermax, rtimercnt, );
576 rtimers [rtimercnt - 1] = w;
577 upheap (rtimers, rtimercnt - 1);
578 }
579
580}
581
582void
583evtimer_stop (struct ev_timer *w)
584{
585 if (!ev_is_active (w))
586 return;
587
588 if (w->is_abs)
589 {
590 if (w->active < atimercnt--)
591 {
592 atimers [w->active - 1] = atimers [atimercnt];
593 downheap (atimers, atimercnt, w->active - 1);
594 }
595 }
596 else
597 {
598 if (w->active < rtimercnt--)
599 {
600 rtimers [w->active - 1] = rtimers [rtimercnt];
601 downheap (rtimers, rtimercnt, w->active - 1);
602 }
603 }
604
605 ev_stop ((struct ev_watcher *)w);
606}
607
608void
609evsignal_start (struct ev_signal *w)
610{
611 if (ev_is_active (w))
612 return;
613
614 ev_start ((struct ev_watcher *)w, 1);
615 array_needsize (signals, signalmax, w->signum, signals_init);
616 wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);
617
618 if (!w->next)
619 {
620 struct sigaction sa;
621 sa.sa_handler = sighandler;
622 sigfillset (&sa.sa_mask);
623 sa.sa_flags = 0;
624 sigaction (w->signum, &sa, 0);
625 }
626}
627
628void
629evsignal_stop (struct ev_signal *w)
630{
631 if (!ev_is_active (w))
632 return;
633
634 wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);
635 ev_stop ((struct ev_watcher *)w);
636
637 if (!signals [w->signum - 1].head)
638 signal (w->signum, SIG_DFL);
639}
640
641/*****************************************************************************/
642#if 1
643
644static void
645sin_cb (struct ev_io *w, int revents)
646{
647 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
648}
649
650static void
651ocb (struct ev_timer *w, int revents)
652{
653 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
654 evtimer_stop (w);
655 evtimer_start (w);
656}
657
658static void
659scb (struct ev_signal *w, int revents)
660{
661 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
662}
663
664int main (void)
665{
666 struct ev_io sin;
667
668 ev_init (0);
669
670 evw_init (&sin, sin_cb, 55);
671 evio_set (&sin, 0, EV_READ);
672 evio_start (&sin);
673
674 struct ev_timer t[10000];
675
676#if 0
677 int i;
678 for (i = 0; i < 10000; ++i)
679 {
680 struct ev_timer *w = t + i;
681 evw_init (w, ocb, i);
682 evtimer_set_abs (w, drand48 (), 0.99775533);
683 evtimer_start (w);
684 if (drand48 () < 0.5)
685 evtimer_stop (w);
686 }
687#endif 3691#endif
688 3692
689 struct ev_timer t1; 3693#if EV_MULTIPLICITY
690 evw_init (&t1, ocb, 0); 3694 #include "ev_wrap.h"
691 evtimer_set_abs (&t1, 5, 10);
692 evtimer_start (&t1);
693
694 struct ev_signal sig;
695 evw_init (&sig, scb, 65535);
696 evsignal_set (&sig, SIGQUIT);
697 evsignal_start (&sig);
698
699 ev_loop (0);
700
701 return 0;
702}
703
704#endif 3695#endif
705 3696
3697#ifdef __cplusplus
3698}
3699#endif
706 3700
707
708

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