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Comparing libev/ev.c (file contents):
Revision 1.17 by root, Wed Oct 31 14:44:15 2007 UTC vs.
Revision 1.317 by root, Sat Nov 14 00:15:21 2009 UTC

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

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