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Comparing libev/ev.c (file contents):
Revision 1.12 by root, Wed Oct 31 09:23:17 2007 UTC vs.
Revision 1.318 by root, Tue Nov 17 00:22:28 2009 UTC

1/*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40#ifdef __cplusplus
41extern "C" {
42#endif
43
44/* this big block deduces configuration from config.h */
45#ifndef EV_STANDALONE
46# ifdef EV_CONFIG_H
47# include EV_CONFIG_H
48# else
49# include "config.h"
50# endif
51
52# if HAVE_CLOCK_SYSCALL
53# ifndef EV_USE_CLOCK_SYSCALL
54# define EV_USE_CLOCK_SYSCALL 1
55# ifndef EV_USE_REALTIME
56# define EV_USE_REALTIME 0
57# endif
58# ifndef EV_USE_MONOTONIC
59# define EV_USE_MONOTONIC 1
60# endif
61# endif
62# elif !defined(EV_USE_CLOCK_SYSCALL)
63# define EV_USE_CLOCK_SYSCALL 0
64# endif
65
66# if HAVE_CLOCK_GETTIME
67# ifndef EV_USE_MONOTONIC
68# define EV_USE_MONOTONIC 1
69# endif
70# ifndef EV_USE_REALTIME
71# define EV_USE_REALTIME 0
72# endif
73# else
74# ifndef EV_USE_MONOTONIC
75# define EV_USE_MONOTONIC 0
76# endif
77# ifndef EV_USE_REALTIME
78# define EV_USE_REALTIME 0
79# endif
80# endif
81
82# ifndef EV_USE_NANOSLEEP
83# if HAVE_NANOSLEEP
84# define EV_USE_NANOSLEEP 1
85# else
86# define EV_USE_NANOSLEEP 0
87# endif
88# endif
89
90# ifndef EV_USE_SELECT
91# if HAVE_SELECT && HAVE_SYS_SELECT_H
92# define EV_USE_SELECT 1
93# else
94# define EV_USE_SELECT 0
95# endif
96# endif
97
98# ifndef EV_USE_POLL
99# if HAVE_POLL && HAVE_POLL_H
100# define EV_USE_POLL 1
101# else
102# define EV_USE_POLL 0
103# endif
104# endif
105
106# ifndef EV_USE_EPOLL
107# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
108# define EV_USE_EPOLL 1
109# else
110# define EV_USE_EPOLL 0
111# endif
112# endif
113
114# ifndef EV_USE_KQUEUE
115# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && 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
155
1#include <math.h> 156#include <math.h>
2#include <stdlib.h> 157#include <stdlib.h>
3#include <unistd.h>
4#include <fcntl.h> 158#include <fcntl.h>
5#include <signal.h> 159#include <stddef.h>
6 160
7#include <stdio.h> 161#include <stdio.h>
8 162
9#include <assert.h> 163#include <assert.h>
10#include <errno.h> 164#include <errno.h>
11#include <sys/time.h> 165#include <sys/types.h>
12#include <time.h> 166#include <time.h>
13 167
14#define HAVE_EPOLL 1 168#include <signal.h>
15 169
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
16#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
17# ifdef CLOCK_MONOTONIC 348#ifndef CLOCK_MONOTONIC
349# undef EV_USE_MONOTONIC
18# 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
19# endif 395# endif
20#endif 396# endif
21 397# ifdef __cplusplus
22#ifndef HAVE_SELECT 398extern "C" {
23# define HAVE_SELECT 1
24#endif 399# endif
25 400int eventfd (unsigned int initval, int flags);
26#ifndef HAVE_EPOLL 401# ifdef __cplusplus
27# define HAVE_EPOLL 0 402}
28#endif 403# endif
404#endif
29 405
30#ifndef HAVE_REALTIME 406#if EV_USE_SIGNALFD
31# 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
32#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 */
33 452
34#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) */
35#define MAX_BLOCKTIME 60. 454#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
36 455
37#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
38 466
39struct ev_watcher { 467#define expect_false(expr) expect ((expr) != 0, 0)
40 EV_WATCHER (ev_watcher); 468#define expect_true(expr) expect ((expr) != 0, 1)
41}; 469#define inline_size static inline
42 470
43struct ev_watcher_list { 471#if EV_MINIMAL
44 EV_WATCHER_LIST (ev_watcher_list); 472# define inline_speed static noinline
45}; 473#else
474# define inline_speed static inline
475#endif
46 476
47struct ev_watcher_time { 477#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
48 EV_WATCHER_TIME (ev_watcher_time);
49};
50 478
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
51typedef struct ev_watcher *W; 488typedef ev_watcher *W;
52typedef struct ev_watcher_list *WL; 489typedef ev_watcher_list *WL;
53typedef struct ev_watcher_time *WT; 490typedef ev_watcher_time *WT;
54 491
55static ev_tstamp now, diff; /* monotonic clock */ 492#define ev_active(w) ((W)(w))->active
56ev_tstamp ev_now; 493#define ev_at(w) ((WT)(w))->at
57int ev_method;
58 494
59static 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
60 500
61static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 501#if EV_USE_MONOTONIC
62static void (*method_modify)(int fd, int oev, int nev); 502static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
63static 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
64 518
65/*****************************************************************************/ 519/*****************************************************************************/
66 520
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
67ev_tstamp 681ev_tstamp
68ev_time (void) 682ev_time (void)
69{ 683{
70#if HAVE_REALTIME 684#if EV_USE_REALTIME
685 if (expect_true (have_realtime))
686 {
71 struct timespec ts; 687 struct timespec ts;
72 clock_gettime (CLOCK_REALTIME, &ts); 688 clock_gettime (CLOCK_REALTIME, &ts);
73 return ts.tv_sec + ts.tv_nsec * 1e-9; 689 return ts.tv_sec + ts.tv_nsec * 1e-9;
74#else 690 }
691#endif
692
75 struct timeval tv; 693 struct timeval tv;
76 gettimeofday (&tv, 0); 694 gettimeofday (&tv, 0);
77 return tv.tv_sec + tv.tv_usec * 1e-6; 695 return tv.tv_sec + tv.tv_usec * 1e-6;
78#endif
79} 696}
697#endif
80 698
81static ev_tstamp 699inline_size ev_tstamp
82get_clock (void) 700get_clock (void)
83{ 701{
84#if HAVE_MONOTONIC 702#if EV_USE_MONOTONIC
85 if (have_monotonic) 703 if (expect_true (have_monotonic))
86 { 704 {
87 struct timespec ts; 705 struct timespec ts;
88 clock_gettime (CLOCK_MONOTONIC, &ts); 706 clock_gettime (CLOCK_MONOTONIC, &ts);
89 return ts.tv_sec + ts.tv_nsec * 1e-9; 707 return ts.tv_sec + ts.tv_nsec * 1e-9;
90 } 708 }
91#endif 709#endif
92 710
93 return ev_time (); 711 return ev_time ();
94} 712}
95 713
96#define array_needsize(base,cur,cnt,init) \ 714#if EV_MULTIPLICITY
97 if ((cnt) > cur) \ 715ev_tstamp
98 { \ 716ev_now (EV_P)
99 int newcnt = cur ? cur << 1 : 16; \ 717{
100 fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ 718 return ev_rt_now;
101 base = realloc (base, sizeof (*base) * (newcnt)); \ 719}
102 init (base + cur, newcnt - cur); \ 720#endif
103 cur = newcnt; \ 721
722void
723ev_sleep (ev_tstamp delay)
724{
725 if (delay > 0.)
104 } 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}
105 749
106/*****************************************************************************/ 750/*****************************************************************************/
107 751
108typedef struct 752#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
109{
110 struct ev_io *head;
111 unsigned char wev, rev; /* want, received event set */
112} ANFD;
113 753
114static ANFD *anfds; 754/* find a suitable new size for the given array, */
115static int anfdmax; 755/* hopefully by rounding to a ncie-to-malloc size */
116 756inline_size int
117static int *fdchanges; 757array_nextsize (int elem, int cur, int cnt)
118static int fdchangemax, fdchangecnt;
119
120static void
121anfds_init (ANFD *base, int count)
122{ 758{
123 while (count--) 759 int ncur = cur + 1;
124 { 760
125 base->head = 0; 761 do
126 base->wev = base->rev = EV_NONE; 762 ncur <<= 1;
127 ++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)
128 } 767 {
129} 768 ncur *= elem;
769 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
770 ncur = ncur - sizeof (void *) * 4;
771 ncur /= elem;
772 }
130 773
131typedef struct 774 return ncur;
132{ 775}
133 W w;
134 int events;
135} ANPENDING;
136 776
137static ANPENDING *pendings; 777static noinline void *
138static int pendingmax, pendingcnt; 778array_realloc (int elem, void *base, int *cur, int cnt)
139
140static void
141event (W w, int events)
142{ 779{
143 w->pending = ++pendingcnt; 780 *cur = array_nextsize (elem, *cur, cnt);
144 array_needsize (pendings, pendingmax, pendingcnt, ); 781 return ev_realloc (base, elem * *cur);
145 pendings [pendingcnt - 1].w = w; 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))
146 pendings [pendingcnt - 1].events = events; 824 pendings [pri][w_->pending - 1].events |= revents;
825 else
826 {
827 w_->pending = ++pendingcnt [pri];
828 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
829 pendings [pri][w_->pending - 1].w = w_;
830 pendings [pri][w_->pending - 1].events = revents;
831 }
147} 832}
148 833
149static 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
150fd_event (int fd, int events) 861fd_event_nc (EV_P_ int fd, int revents)
151{ 862{
152 ANFD *anfd = anfds + fd; 863 ANFD *anfd = anfds + fd;
153 struct ev_io *w; 864 ev_io *w;
154 865
155 for (w = anfd->head; w; w = w->next) 866 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
156 { 867 {
157 int ev = w->events & events; 868 int ev = w->events & revents;
158 869
159 if (ev) 870 if (ev)
160 event ((W)w, ev); 871 ev_feed_event (EV_A_ (W)w, ev);
161 }
162}
163
164static void
165queue_events (W *events, int eventcnt, int type)
166{
167 int i;
168
169 for (i = 0; i < eventcnt; ++i)
170 event (events [i], type);
171}
172
173/*****************************************************************************/
174
175static struct ev_timer **timers;
176static int timermax, timercnt;
177
178static struct ev_periodic **periodics;
179static int periodicmax, periodiccnt;
180
181static void
182upheap (WT *timers, int k)
183{
184 WT w = timers [k];
185
186 while (k && timers [k >> 1]->at > w->at)
187 {
188 timers [k] = timers [k >> 1];
189 timers [k]->active = k + 1;
190 k >>= 1;
191 }
192
193 timers [k] = w;
194 timers [k]->active = k + 1;
195
196}
197
198static void
199downheap (WT *timers, int N, int k)
200{
201 WT w = timers [k];
202
203 while (k < (N >> 1))
204 {
205 int j = k << 1;
206
207 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
208 ++j;
209
210 if (w->at <= timers [j]->at)
211 break;
212
213 timers [k] = timers [j];
214 timers [k]->active = k + 1;
215 k = j;
216 }
217
218 timers [k] = w;
219 timers [k]->active = k + 1;
220}
221
222/*****************************************************************************/
223
224typedef struct
225{
226 struct ev_signal *head;
227 sig_atomic_t gotsig;
228} ANSIG;
229
230static ANSIG *signals;
231static int signalmax;
232
233static int sigpipe [2];
234static sig_atomic_t gotsig;
235static struct ev_io sigev;
236
237static void
238signals_init (ANSIG *base, int count)
239{
240 while (count--)
241 {
242 base->head = 0;
243 base->gotsig = 0;
244 ++base;
245 }
246}
247
248static void
249sighandler (int signum)
250{
251 signals [signum - 1].gotsig = 1;
252
253 if (!gotsig)
254 {
255 gotsig = 1;
256 write (sigpipe [1], &gotsig, 1);
257 }
258}
259
260static void
261sigcb (struct ev_io *iow, int revents)
262{
263 struct ev_signal *w;
264 int sig;
265
266 gotsig = 0;
267 read (sigpipe [0], &revents, 1);
268
269 for (sig = signalmax; sig--; )
270 if (signals [sig].gotsig)
271 {
272 signals [sig].gotsig = 0;
273
274 for (w = signals [sig].head; w; w = w->next)
275 event ((W)w, EV_SIGNAL);
276 } 872 }
277} 873}
278 874
279static void 875/* do not submit kernel events for fds that have reify set */
280siginit (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)
281{ 879{
282 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); 880 ANFD *anfd = anfds + fd;
283 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
284 881
285 /* rather than sort out wether we really need nb, set it */ 882 if (expect_true (!anfd->reify))
286 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 883 fd_event_nc (EV_A_ fd, revents);
287 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
288
289 evio_set (&sigev, sigpipe [0], EV_READ);
290 evio_start (&sigev);
291} 884}
292 885
293/*****************************************************************************/ 886void
294 887ev_feed_fd_event (EV_P_ int fd, int revents)
295static struct ev_idle **idles;
296static int idlemax, idlecnt;
297
298static struct ev_check **checks;
299static int checkmax, checkcnt;
300
301/*****************************************************************************/
302
303#if HAVE_EPOLL
304# include "ev_epoll.c"
305#endif
306#if HAVE_SELECT
307# include "ev_select.c"
308#endif
309
310int ev_init (int flags)
311{ 888{
312#if HAVE_MONOTONIC 889 if (fd >= 0 && fd < anfdmax)
313 { 890 fd_event_nc (EV_A_ fd, revents);
314 struct timespec ts;
315 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
316 have_monotonic = 1;
317 }
318#endif
319
320 ev_now = ev_time ();
321 now = get_clock ();
322 diff = ev_now - now;
323
324 if (pipe (sigpipe))
325 return 0;
326
327 ev_method = EVMETHOD_NONE;
328#if HAVE_EPOLL
329 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
330#endif
331#if HAVE_SELECT
332 if (ev_method == EVMETHOD_NONE) select_init (flags);
333#endif
334
335 if (ev_method)
336 {
337 evw_init (&sigev, sigcb);
338 siginit ();
339 }
340
341 return ev_method;
342} 891}
343 892
344/*****************************************************************************/ 893/* make sure the external fd watch events are in-sync */
345 894/* with the kernel/libev internal state */
346void ev_prefork (void) 895inline_size void
347{ 896fd_reify (EV_P)
348 /* nop */
349}
350
351void ev_postfork_parent (void)
352{
353 /* nop */
354}
355
356void ev_postfork_child (void)
357{
358#if HAVE_EPOLL
359 if (ev_method == EVMETHOD_EPOLL)
360 epoll_postfork_child ();
361#endif
362
363 evio_stop (&sigev);
364 close (sigpipe [0]);
365 close (sigpipe [1]);
366 pipe (sigpipe);
367 siginit ();
368}
369
370/*****************************************************************************/
371
372static void
373fd_reify (void)
374{ 897{
375 int i; 898 int i;
376 899
377 for (i = 0; i < fdchangecnt; ++i) 900 for (i = 0; i < fdchangecnt; ++i)
378 { 901 {
379 int fd = fdchanges [i]; 902 int fd = fdchanges [i];
380 ANFD *anfd = anfds + fd; 903 ANFD *anfd = anfds + fd;
381 struct ev_io *w; 904 ev_io *w;
382 905
383 int wev = 0; 906 unsigned char events = 0;
384 907
385 for (w = anfd->head; w; w = w->next) 908 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
386 wev |= w->events; 909 events |= (unsigned char)w->events;
387 910
388 if (anfd->wev != wev) 911#if EV_SELECT_IS_WINSOCKET
912 if (events)
389 { 913 {
390 method_modify (fd, anfd->wev, wev); 914 unsigned long arg;
391 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));
392 } 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 }
393 } 930 }
394 931
395 fdchangecnt = 0; 932 fdchangecnt = 0;
396} 933}
397 934
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) */
398static void 1247static void
399call_pending () 1248pipecb (EV_P_ ev_io *iow, int revents)
400{ 1249{
401 int i; 1250 int i;
402 1251
403 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));
404 { 1257 }
405 ANPENDING *p = pendings + i; 1258 else
1259#endif
1260 {
1261 char dummy;
1262 read (evpipe [0], &dummy, 1);
1263 }
406 1264
407 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)))
408 { 1373 {
409 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 */
410 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);
411 } 1378 }
412 } 1379 }
413
414 pendingcnt = 0;
415} 1380}
416 1381
1382#ifndef WCONTINUED
1383# define WCONTINUED 0
1384#endif
1385
1386/* called on sigchld etc., calls waitpid */
417static 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
418timers_reify () 2028timers_reify (EV_P)
419{ 2029{
420 while (timercnt && timers [0]->at <= now) 2030 EV_FREQUENT_CHECK;
421 {
422 struct ev_timer *w = timers [0];
423 2031
2032 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2033 {
2034 do
2035 {
2036 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2037
2038 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2039
424 /* 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 {
425 if (w->repeat) 2599 if (w->repeat)
426 { 2600 {
427 w->at = now + w->repeat; 2601 ev_at (w) = mn_now + w->repeat;
428 assert (("timer timeout in the past, negative repeat?", w->at > now)); 2602 ANHE_at_cache (timers [ev_active (w)]);
429 downheap ((WT *)timers, timercnt, 0); 2603 adjustheap (timers, timercnt, ev_active (w));
430 } 2604 }
431 else 2605 else
432 evtimer_stop (w); /* nonrepeating: stop timer */ 2606 ev_timer_stop (EV_A_ w);
433
434 event ((W)w, EV_TIMEOUT);
435 }
436}
437
438static void
439periodics_reify ()
440{
441 while (periodiccnt && periodics [0]->at <= ev_now)
442 { 2607 }
443 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 }
444 2613
445 /* 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);
446 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)
447 { 2721 {
448 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 2722 fd_intern (sigfd); /* doing it twice will not hurt */
449 assert (("periodic timeout in the past, negative interval?", w->at > ev_now)); 2723
450 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? */
451 } 2799 }
452 else 2800 else
453 evperiodic_stop (w); /* nonrepeating: stop timer */ 2801#endif
454 2802 signal (w->signum, SIG_DFL);
455 event ((W)w, EV_TIMEOUT);
456 }
457}
458
459static void
460time_jump (ev_tstamp diff)
461{
462 int i;
463
464 /* adjust periodics */
465 for (i = 0; i < periodiccnt; ++i)
466 { 2803 }
467 struct ev_periodic *w = periodics [i];
468 2804
469 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 struct statfs sfs;
2864
2865 /* now local changes will be tracked by inotify, but remote changes won't */
2866 /* unless the filesystem is known to be local, we therefore still poll */
2867 /* also do poll on <2.6.25, but with normal frequency */
2868
2869 if (!fs_2625)
2870 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2871 else if (!statfs (w->path, &sfs)
2872 && (sfs.f_type == 0x1373 /* devfs */
2873 || sfs.f_type == 0xEF53 /* ext2/3 */
2874 || sfs.f_type == 0x3153464a /* jfs */
2875 || sfs.f_type == 0x52654973 /* reiser3 */
2876 || sfs.f_type == 0x01021994 /* tempfs */
2877 || sfs.f_type == 0x58465342 /* xfs */))
2878 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
2879 else
2880 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
2881 }
2882 else
2883 {
2884 /* can't use inotify, continue to stat */
2885 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2886
2887 /* if path is not there, monitor some parent directory for speedup hints */
2888 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2889 /* but an efficiency issue only */
2890 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
470 { 2891 {
471 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 2892 char path [4096];
2893 strcpy (path, w->path);
472 2894
473 if (fabs (diff) >= 1e-4) 2895 do
474 { 2896 {
475 evperiodic_stop (w); 2897 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
476 evperiodic_start (w); 2898 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
477 2899
478 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 2900 char *pend = strrchr (path, '/');
2901
2902 if (!pend || pend == path)
2903 break;
2904
2905 *pend = 0;
2906 w->wd = inotify_add_watch (fs_fd, path, mask);
2907 }
2908 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2909 }
2910 }
2911
2912 if (w->wd >= 0)
2913 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2914
2915 /* now re-arm timer, if required */
2916 if (ev_is_active (&w->timer)) ev_ref (EV_A);
2917 ev_timer_again (EV_A_ &w->timer);
2918 if (ev_is_active (&w->timer)) ev_unref (EV_A);
2919}
2920
2921static void noinline
2922infy_del (EV_P_ ev_stat *w)
2923{
2924 int slot;
2925 int wd = w->wd;
2926
2927 if (wd < 0)
2928 return;
2929
2930 w->wd = -2;
2931 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2932 wlist_del (&fs_hash [slot].head, (WL)w);
2933
2934 /* remove this watcher, if others are watching it, they will rearm */
2935 inotify_rm_watch (fs_fd, wd);
2936}
2937
2938static void noinline
2939infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2940{
2941 if (slot < 0)
2942 /* overflow, need to check for all hash slots */
2943 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2944 infy_wd (EV_A_ slot, wd, ev);
2945 else
2946 {
2947 WL w_;
2948
2949 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2950 {
2951 ev_stat *w = (ev_stat *)w_;
2952 w_ = w_->next; /* lets us remove this watcher and all before it */
2953
2954 if (w->wd == wd || wd == -1)
2955 {
2956 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2957 {
2958 wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2959 w->wd = -1;
2960 infy_add (EV_A_ w); /* re-add, no matter what */
2961 }
2962
2963 stat_timer_cb (EV_A_ &w->timer, 0);
479 } 2964 }
480 } 2965 }
481 } 2966 }
482
483 /* adjust timers. this is easy, as the offset is the same for all */
484 for (i = 0; i < timercnt; ++i)
485 timers [i]->at += diff;
486} 2967}
487 2968
488static void 2969static void
489time_update () 2970infy_cb (EV_P_ ev_io *w, int revents)
490{ 2971{
2972 char buf [EV_INOTIFY_BUFSIZE];
2973 struct inotify_event *ev = (struct inotify_event *)buf;
491 int i; 2974 int ofs;
2975 int len = read (fs_fd, buf, sizeof (buf));
492 2976
493 ev_now = ev_time (); 2977 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2978 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2979}
494 2980
495 if (have_monotonic) 2981inline_size void
2982check_2625 (EV_P)
2983{
2984 /* kernels < 2.6.25 are borked
2985 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
2986 */
2987 struct utsname buf;
2988 int major, minor, micro;
2989
2990 if (uname (&buf))
2991 return;
2992
2993 if (sscanf (buf.release, "%d.%d.%d", &major, &minor, &micro) != 3)
2994 return;
2995
2996 if (major < 2
2997 || (major == 2 && minor < 6)
2998 || (major == 2 && minor == 6 && micro < 25))
2999 return;
3000
3001 fs_2625 = 1;
3002}
3003
3004inline_size int
3005infy_newfd (void)
3006{
3007#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3008 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3009 if (fd >= 0)
3010 return fd;
3011#endif
3012 return inotify_init ();
3013}
3014
3015inline_size void
3016infy_init (EV_P)
3017{
3018 if (fs_fd != -2)
3019 return;
3020
3021 fs_fd = -1;
3022
3023 check_2625 (EV_A);
3024
3025 fs_fd = infy_newfd ();
3026
3027 if (fs_fd >= 0)
3028 {
3029 fd_intern (fs_fd);
3030 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3031 ev_set_priority (&fs_w, EV_MAXPRI);
3032 ev_io_start (EV_A_ &fs_w);
3033 ev_unref (EV_A);
496 { 3034 }
497 ev_tstamp odiff = diff; 3035}
498 3036
499 for (i = 4; --i; ) /* loop a few times, before making important decisions */ 3037inline_size void
3038infy_fork (EV_P)
3039{
3040 int slot;
3041
3042 if (fs_fd < 0)
3043 return;
3044
3045 ev_ref (EV_A);
3046 ev_io_stop (EV_A_ &fs_w);
3047 close (fs_fd);
3048 fs_fd = infy_newfd ();
3049
3050 if (fs_fd >= 0)
3051 {
3052 fd_intern (fs_fd);
3053 ev_io_set (&fs_w, fs_fd, EV_READ);
3054 ev_io_start (EV_A_ &fs_w);
3055 ev_unref (EV_A);
3056 }
3057
3058 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
3059 {
3060 WL w_ = fs_hash [slot].head;
3061 fs_hash [slot].head = 0;
3062
3063 while (w_)
500 { 3064 {
501 now = get_clock (); 3065 ev_stat *w = (ev_stat *)w_;
502 diff = ev_now - now; 3066 w_ = w_->next; /* lets us add this watcher */
503 3067
504 if (fabs (odiff - diff) < MIN_TIMEJUMP) 3068 w->wd = -1;
505 return; /* all is well */
506 3069
507 ev_now = ev_time (); 3070 if (fs_fd >= 0)
3071 infy_add (EV_A_ w); /* re-add, no matter what */
3072 else
3073 {
3074 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3075 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3076 ev_timer_again (EV_A_ &w->timer);
3077 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3078 }
508 } 3079 }
509
510 time_jump (diff - odiff);
511 } 3080 }
3081}
3082
3083#endif
3084
3085#ifdef _WIN32
3086# define EV_LSTAT(p,b) _stati64 (p, b)
3087#else
3088# define EV_LSTAT(p,b) lstat (p, b)
3089#endif
3090
3091void
3092ev_stat_stat (EV_P_ ev_stat *w)
3093{
3094 if (lstat (w->path, &w->attr) < 0)
3095 w->attr.st_nlink = 0;
3096 else if (!w->attr.st_nlink)
3097 w->attr.st_nlink = 1;
3098}
3099
3100static void noinline
3101stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3102{
3103 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3104
3105 /* we copy this here each the time so that */
3106 /* prev has the old value when the callback gets invoked */
3107 w->prev = w->attr;
3108 ev_stat_stat (EV_A_ w);
3109
3110 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3111 if (
3112 w->prev.st_dev != w->attr.st_dev
3113 || w->prev.st_ino != w->attr.st_ino
3114 || w->prev.st_mode != w->attr.st_mode
3115 || w->prev.st_nlink != w->attr.st_nlink
3116 || w->prev.st_uid != w->attr.st_uid
3117 || w->prev.st_gid != w->attr.st_gid
3118 || w->prev.st_rdev != w->attr.st_rdev
3119 || w->prev.st_size != w->attr.st_size
3120 || w->prev.st_atime != w->attr.st_atime
3121 || w->prev.st_mtime != w->attr.st_mtime
3122 || w->prev.st_ctime != w->attr.st_ctime
3123 ) {
3124 #if EV_USE_INOTIFY
3125 if (fs_fd >= 0)
3126 {
3127 infy_del (EV_A_ w);
3128 infy_add (EV_A_ w);
3129 ev_stat_stat (EV_A_ w); /* avoid race... */
3130 }
3131 #endif
3132
3133 ev_feed_event (EV_A_ w, EV_STAT);
3134 }
3135}
3136
3137void
3138ev_stat_start (EV_P_ ev_stat *w)
3139{
3140 if (expect_false (ev_is_active (w)))
3141 return;
3142
3143 ev_stat_stat (EV_A_ w);
3144
3145 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3146 w->interval = MIN_STAT_INTERVAL;
3147
3148 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3149 ev_set_priority (&w->timer, ev_priority (w));
3150
3151#if EV_USE_INOTIFY
3152 infy_init (EV_A);
3153
3154 if (fs_fd >= 0)
3155 infy_add (EV_A_ w);
512 else 3156 else
3157#endif
3158 {
3159 ev_timer_again (EV_A_ &w->timer);
3160 ev_unref (EV_A);
3161 }
3162
3163 ev_start (EV_A_ (W)w, 1);
3164
3165 EV_FREQUENT_CHECK;
3166}
3167
3168void
3169ev_stat_stop (EV_P_ ev_stat *w)
3170{
3171 clear_pending (EV_A_ (W)w);
3172 if (expect_false (!ev_is_active (w)))
3173 return;
3174
3175 EV_FREQUENT_CHECK;
3176
3177#if EV_USE_INOTIFY
3178 infy_del (EV_A_ w);
3179#endif
3180
3181 if (ev_is_active (&w->timer))
3182 {
3183 ev_ref (EV_A);
3184 ev_timer_stop (EV_A_ &w->timer);
3185 }
3186
3187 ev_stop (EV_A_ (W)w);
3188
3189 EV_FREQUENT_CHECK;
3190}
3191#endif
3192
3193#if EV_IDLE_ENABLE
3194void
3195ev_idle_start (EV_P_ ev_idle *w)
3196{
3197 if (expect_false (ev_is_active (w)))
3198 return;
3199
3200 pri_adjust (EV_A_ (W)w);
3201
3202 EV_FREQUENT_CHECK;
3203
3204 {
3205 int active = ++idlecnt [ABSPRI (w)];
3206
3207 ++idleall;
3208 ev_start (EV_A_ (W)w, active);
3209
3210 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3211 idles [ABSPRI (w)][active - 1] = w;
3212 }
3213
3214 EV_FREQUENT_CHECK;
3215}
3216
3217void
3218ev_idle_stop (EV_P_ ev_idle *w)
3219{
3220 clear_pending (EV_A_ (W)w);
3221 if (expect_false (!ev_is_active (w)))
3222 return;
3223
3224 EV_FREQUENT_CHECK;
3225
3226 {
3227 int active = ev_active (w);
3228
3229 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3230 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3231
3232 ev_stop (EV_A_ (W)w);
3233 --idleall;
3234 }
3235
3236 EV_FREQUENT_CHECK;
3237}
3238#endif
3239
3240void
3241ev_prepare_start (EV_P_ ev_prepare *w)
3242{
3243 if (expect_false (ev_is_active (w)))
3244 return;
3245
3246 EV_FREQUENT_CHECK;
3247
3248 ev_start (EV_A_ (W)w, ++preparecnt);
3249 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3250 prepares [preparecnt - 1] = w;
3251
3252 EV_FREQUENT_CHECK;
3253}
3254
3255void
3256ev_prepare_stop (EV_P_ ev_prepare *w)
3257{
3258 clear_pending (EV_A_ (W)w);
3259 if (expect_false (!ev_is_active (w)))
3260 return;
3261
3262 EV_FREQUENT_CHECK;
3263
3264 {
3265 int active = ev_active (w);
3266
3267 prepares [active - 1] = prepares [--preparecnt];
3268 ev_active (prepares [active - 1]) = active;
3269 }
3270
3271 ev_stop (EV_A_ (W)w);
3272
3273 EV_FREQUENT_CHECK;
3274}
3275
3276void
3277ev_check_start (EV_P_ ev_check *w)
3278{
3279 if (expect_false (ev_is_active (w)))
3280 return;
3281
3282 EV_FREQUENT_CHECK;
3283
3284 ev_start (EV_A_ (W)w, ++checkcnt);
3285 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3286 checks [checkcnt - 1] = w;
3287
3288 EV_FREQUENT_CHECK;
3289}
3290
3291void
3292ev_check_stop (EV_P_ ev_check *w)
3293{
3294 clear_pending (EV_A_ (W)w);
3295 if (expect_false (!ev_is_active (w)))
3296 return;
3297
3298 EV_FREQUENT_CHECK;
3299
3300 {
3301 int active = ev_active (w);
3302
3303 checks [active - 1] = checks [--checkcnt];
3304 ev_active (checks [active - 1]) = active;
3305 }
3306
3307 ev_stop (EV_A_ (W)w);
3308
3309 EV_FREQUENT_CHECK;
3310}
3311
3312#if EV_EMBED_ENABLE
3313void noinline
3314ev_embed_sweep (EV_P_ ev_embed *w)
3315{
3316 ev_loop (w->other, EVLOOP_NONBLOCK);
3317}
3318
3319static void
3320embed_io_cb (EV_P_ ev_io *io, int revents)
3321{
3322 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3323
3324 if (ev_cb (w))
3325 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3326 else
3327 ev_loop (w->other, EVLOOP_NONBLOCK);
3328}
3329
3330static void
3331embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3332{
3333 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3334
3335 {
3336 EV_P = w->other;
3337
3338 while (fdchangecnt)
513 { 3339 {
514 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
515 time_jump (ev_now - now);
516
517 now = ev_now;
518 }
519}
520
521int ev_loop_done;
522
523void ev_loop (int flags)
524{
525 double block;
526 ev_loop_done = flags & EVLOOP_ONESHOT;
527
528 if (checkcnt)
529 {
530 queue_events ((W *)checks, checkcnt, EV_CHECK);
531 call_pending ();
532 }
533
534 do
535 {
536 /* update fd-related kernel structures */
537 fd_reify (); 3340 fd_reify (EV_A);
3341 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3342 }
3343 }
3344}
538 3345
539 /* calculate blocking time */ 3346static void
3347embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3348{
3349 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
540 3350
541 /* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */ 3351 ev_embed_stop (EV_A_ w);
542 ev_now = ev_time ();
543 3352
544 if (flags & EVLOOP_NONBLOCK || idlecnt) 3353 {
545 block = 0.; 3354 EV_P = w->other;
3355
3356 ev_loop_fork (EV_A);
3357 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3358 }
3359
3360 ev_embed_start (EV_A_ w);
3361}
3362
3363#if 0
3364static void
3365embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3366{
3367 ev_idle_stop (EV_A_ idle);
3368}
3369#endif
3370
3371void
3372ev_embed_start (EV_P_ ev_embed *w)
3373{
3374 if (expect_false (ev_is_active (w)))
3375 return;
3376
3377 {
3378 EV_P = w->other;
3379 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3380 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3381 }
3382
3383 EV_FREQUENT_CHECK;
3384
3385 ev_set_priority (&w->io, ev_priority (w));
3386 ev_io_start (EV_A_ &w->io);
3387
3388 ev_prepare_init (&w->prepare, embed_prepare_cb);
3389 ev_set_priority (&w->prepare, EV_MINPRI);
3390 ev_prepare_start (EV_A_ &w->prepare);
3391
3392 ev_fork_init (&w->fork, embed_fork_cb);
3393 ev_fork_start (EV_A_ &w->fork);
3394
3395 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3396
3397 ev_start (EV_A_ (W)w, 1);
3398
3399 EV_FREQUENT_CHECK;
3400}
3401
3402void
3403ev_embed_stop (EV_P_ ev_embed *w)
3404{
3405 clear_pending (EV_A_ (W)w);
3406 if (expect_false (!ev_is_active (w)))
3407 return;
3408
3409 EV_FREQUENT_CHECK;
3410
3411 ev_io_stop (EV_A_ &w->io);
3412 ev_prepare_stop (EV_A_ &w->prepare);
3413 ev_fork_stop (EV_A_ &w->fork);
3414
3415 EV_FREQUENT_CHECK;
3416}
3417#endif
3418
3419#if EV_FORK_ENABLE
3420void
3421ev_fork_start (EV_P_ ev_fork *w)
3422{
3423 if (expect_false (ev_is_active (w)))
3424 return;
3425
3426 EV_FREQUENT_CHECK;
3427
3428 ev_start (EV_A_ (W)w, ++forkcnt);
3429 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3430 forks [forkcnt - 1] = w;
3431
3432 EV_FREQUENT_CHECK;
3433}
3434
3435void
3436ev_fork_stop (EV_P_ ev_fork *w)
3437{
3438 clear_pending (EV_A_ (W)w);
3439 if (expect_false (!ev_is_active (w)))
3440 return;
3441
3442 EV_FREQUENT_CHECK;
3443
3444 {
3445 int active = ev_active (w);
3446
3447 forks [active - 1] = forks [--forkcnt];
3448 ev_active (forks [active - 1]) = active;
3449 }
3450
3451 ev_stop (EV_A_ (W)w);
3452
3453 EV_FREQUENT_CHECK;
3454}
3455#endif
3456
3457#if EV_ASYNC_ENABLE
3458void
3459ev_async_start (EV_P_ ev_async *w)
3460{
3461 if (expect_false (ev_is_active (w)))
3462 return;
3463
3464 evpipe_init (EV_A);
3465
3466 EV_FREQUENT_CHECK;
3467
3468 ev_start (EV_A_ (W)w, ++asynccnt);
3469 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3470 asyncs [asynccnt - 1] = w;
3471
3472 EV_FREQUENT_CHECK;
3473}
3474
3475void
3476ev_async_stop (EV_P_ ev_async *w)
3477{
3478 clear_pending (EV_A_ (W)w);
3479 if (expect_false (!ev_is_active (w)))
3480 return;
3481
3482 EV_FREQUENT_CHECK;
3483
3484 {
3485 int active = ev_active (w);
3486
3487 asyncs [active - 1] = asyncs [--asynccnt];
3488 ev_active (asyncs [active - 1]) = active;
3489 }
3490
3491 ev_stop (EV_A_ (W)w);
3492
3493 EV_FREQUENT_CHECK;
3494}
3495
3496void
3497ev_async_send (EV_P_ ev_async *w)
3498{
3499 w->sent = 1;
3500 evpipe_write (EV_A_ &async_pending);
3501}
3502#endif
3503
3504/*****************************************************************************/
3505
3506struct ev_once
3507{
3508 ev_io io;
3509 ev_timer to;
3510 void (*cb)(int revents, void *arg);
3511 void *arg;
3512};
3513
3514static void
3515once_cb (EV_P_ struct ev_once *once, int revents)
3516{
3517 void (*cb)(int revents, void *arg) = once->cb;
3518 void *arg = once->arg;
3519
3520 ev_io_stop (EV_A_ &once->io);
3521 ev_timer_stop (EV_A_ &once->to);
3522 ev_free (once);
3523
3524 cb (revents, arg);
3525}
3526
3527static void
3528once_cb_io (EV_P_ ev_io *w, int revents)
3529{
3530 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3531
3532 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3533}
3534
3535static void
3536once_cb_to (EV_P_ ev_timer *w, int revents)
3537{
3538 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3539
3540 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3541}
3542
3543void
3544ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3545{
3546 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3547
3548 if (expect_false (!once))
3549 {
3550 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3551 return;
3552 }
3553
3554 once->cb = cb;
3555 once->arg = arg;
3556
3557 ev_init (&once->io, once_cb_io);
3558 if (fd >= 0)
3559 {
3560 ev_io_set (&once->io, fd, events);
3561 ev_io_start (EV_A_ &once->io);
3562 }
3563
3564 ev_init (&once->to, once_cb_to);
3565 if (timeout >= 0.)
3566 {
3567 ev_timer_set (&once->to, timeout, 0.);
3568 ev_timer_start (EV_A_ &once->to);
3569 }
3570}
3571
3572/*****************************************************************************/
3573
3574#if EV_WALK_ENABLE
3575void
3576ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3577{
3578 int i, j;
3579 ev_watcher_list *wl, *wn;
3580
3581 if (types & (EV_IO | EV_EMBED))
3582 for (i = 0; i < anfdmax; ++i)
3583 for (wl = anfds [i].head; wl; )
3584 {
3585 wn = wl->next;
3586
3587#if EV_EMBED_ENABLE
3588 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3589 {
3590 if (types & EV_EMBED)
3591 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3592 }
3593 else
3594#endif
3595#if EV_USE_INOTIFY
3596 if (ev_cb ((ev_io *)wl) == infy_cb)
3597 ;
3598 else
3599#endif
3600 if ((ev_io *)wl != &pipe_w)
3601 if (types & EV_IO)
3602 cb (EV_A_ EV_IO, wl);
3603
3604 wl = wn;
3605 }
3606
3607 if (types & (EV_TIMER | EV_STAT))
3608 for (i = timercnt + HEAP0; i-- > HEAP0; )
3609#if EV_STAT_ENABLE
3610 /*TODO: timer is not always active*/
3611 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3612 {
3613 if (types & EV_STAT)
3614 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3615 }
546 else 3616 else
3617#endif
3618 if (types & EV_TIMER)
3619 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3620
3621#if EV_PERIODIC_ENABLE
3622 if (types & EV_PERIODIC)
3623 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3624 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3625#endif
3626
3627#if EV_IDLE_ENABLE
3628 if (types & EV_IDLE)
3629 for (j = NUMPRI; i--; )
3630 for (i = idlecnt [j]; i--; )
3631 cb (EV_A_ EV_IDLE, idles [j][i]);
3632#endif
3633
3634#if EV_FORK_ENABLE
3635 if (types & EV_FORK)
3636 for (i = forkcnt; i--; )
3637 if (ev_cb (forks [i]) != embed_fork_cb)
3638 cb (EV_A_ EV_FORK, forks [i]);
3639#endif
3640
3641#if EV_ASYNC_ENABLE
3642 if (types & EV_ASYNC)
3643 for (i = asynccnt; i--; )
3644 cb (EV_A_ EV_ASYNC, asyncs [i]);
3645#endif
3646
3647 if (types & EV_PREPARE)
3648 for (i = preparecnt; i--; )
3649#if EV_EMBED_ENABLE
3650 if (ev_cb (prepares [i]) != embed_prepare_cb)
3651#endif
3652 cb (EV_A_ EV_PREPARE, prepares [i]);
3653
3654 if (types & EV_CHECK)
3655 for (i = checkcnt; i--; )
3656 cb (EV_A_ EV_CHECK, checks [i]);
3657
3658 if (types & EV_SIGNAL)
3659 for (i = 0; i < EV_NSIG - 1; ++i)
3660 for (wl = signals [i].head; wl; )
547 { 3661 {
548 block = MAX_BLOCKTIME; 3662 wn = wl->next;
549 3663 cb (EV_A_ EV_SIGNAL, wl);
550 if (timercnt) 3664 wl = wn;
551 {
552 ev_tstamp to = timers [0]->at - get_clock () + method_fudge;
553 if (block > to) block = to;
554 }
555
556 if (periodiccnt)
557 {
558 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
559 if (block > to) block = to;
560 }
561
562 if (block < 0.) block = 0.;
563 } 3665 }
564 3666
565 method_poll (block); 3667 if (types & EV_CHILD)
566 3668 for (i = EV_PID_HASHSIZE; i--; )
567 /* update ev_now, do magic */ 3669 for (wl = childs [i]; wl; )
568 time_update ();
569
570 /* queue pending timers and reschedule them */
571 periodics_reify (); /* absolute timers first */
572 timers_reify (); /* relative timers second */
573
574 /* queue idle watchers unless io or timers are pending */
575 if (!pendingcnt)
576 queue_events ((W *)idles, idlecnt, EV_IDLE);
577
578 /* queue check and possibly idle watchers */
579 queue_events ((W *)checks, checkcnt, EV_CHECK);
580
581 call_pending ();
582 }
583 while (!ev_loop_done);
584}
585
586/*****************************************************************************/
587
588static void
589wlist_add (WL *head, WL elem)
590{
591 elem->next = *head;
592 *head = elem;
593}
594
595static void
596wlist_del (WL *head, WL elem)
597{
598 while (*head)
599 {
600 if (*head == elem)
601 { 3670 {
602 *head = elem->next; 3671 wn = wl->next;
603 return; 3672 cb (EV_A_ EV_CHILD, wl);
3673 wl = wn;
604 } 3674 }
605 3675/* EV_STAT 0x00001000 /* stat data changed */
606 head = &(*head)->next; 3676/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
607 }
608} 3677}
609
610static void
611ev_start (W w, int active)
612{
613 w->pending = 0;
614 w->active = active;
615}
616
617static void
618ev_stop (W w)
619{
620 if (w->pending)
621 pendings [w->pending - 1].w = 0;
622
623 w->active = 0;
624}
625
626/*****************************************************************************/
627
628void
629evio_start (struct ev_io *w)
630{
631 if (ev_is_active (w))
632 return;
633
634 int fd = w->fd;
635
636 ev_start ((W)w, 1);
637 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
638 wlist_add ((WL *)&anfds[fd].head, (WL)w);
639
640 ++fdchangecnt;
641 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
642 fdchanges [fdchangecnt - 1] = fd;
643}
644
645void
646evio_stop (struct ev_io *w)
647{
648 if (!ev_is_active (w))
649 return;
650
651 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
652 ev_stop ((W)w);
653
654 ++fdchangecnt;
655 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
656 fdchanges [fdchangecnt - 1] = w->fd;
657}
658
659
660void
661evtimer_start (struct ev_timer *w)
662{
663 if (ev_is_active (w))
664 return;
665
666 w->at += now;
667
668 ev_start ((W)w, ++timercnt);
669 array_needsize (timers, timermax, timercnt, );
670 timers [timercnt - 1] = w;
671 upheap ((WT *)timers, timercnt - 1);
672}
673
674void
675evtimer_stop (struct ev_timer *w)
676{
677 if (!ev_is_active (w))
678 return;
679
680 if (w->active < timercnt--)
681 {
682 timers [w->active - 1] = timers [timercnt];
683 downheap ((WT *)timers, timercnt, w->active - 1);
684 }
685
686 ev_stop ((W)w);
687}
688
689void
690evperiodic_start (struct ev_periodic *w)
691{
692 if (ev_is_active (w))
693 return;
694
695 /* this formula differs from the one in periodic_reify because we do not always round up */
696 if (w->interval)
697 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
698
699 ev_start ((W)w, ++periodiccnt);
700 array_needsize (periodics, periodicmax, periodiccnt, );
701 periodics [periodiccnt - 1] = w;
702 upheap ((WT *)periodics, periodiccnt - 1);
703}
704
705void
706evperiodic_stop (struct ev_periodic *w)
707{
708 if (!ev_is_active (w))
709 return;
710
711 if (w->active < periodiccnt--)
712 {
713 periodics [w->active - 1] = periodics [periodiccnt];
714 downheap ((WT *)periodics, periodiccnt, w->active - 1);
715 }
716
717 ev_stop ((W)w);
718}
719
720void
721evsignal_start (struct ev_signal *w)
722{
723 if (ev_is_active (w))
724 return;
725
726 ev_start ((W)w, 1);
727 array_needsize (signals, signalmax, w->signum, signals_init);
728 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
729
730 if (!w->next)
731 {
732 struct sigaction sa;
733 sa.sa_handler = sighandler;
734 sigfillset (&sa.sa_mask);
735 sa.sa_flags = 0;
736 sigaction (w->signum, &sa, 0);
737 }
738}
739
740void
741evsignal_stop (struct ev_signal *w)
742{
743 if (!ev_is_active (w))
744 return;
745
746 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
747 ev_stop ((W)w);
748
749 if (!signals [w->signum - 1].head)
750 signal (w->signum, SIG_DFL);
751}
752
753void evidle_start (struct ev_idle *w)
754{
755 if (ev_is_active (w))
756 return;
757
758 ev_start ((W)w, ++idlecnt);
759 array_needsize (idles, idlemax, idlecnt, );
760 idles [idlecnt - 1] = w;
761}
762
763void evidle_stop (struct ev_idle *w)
764{
765 idles [w->active - 1] = idles [--idlecnt];
766 ev_stop ((W)w);
767}
768
769void evcheck_start (struct ev_check *w)
770{
771 if (ev_is_active (w))
772 return;
773
774 ev_start ((W)w, ++checkcnt);
775 array_needsize (checks, checkmax, checkcnt, );
776 checks [checkcnt - 1] = w;
777}
778
779void evcheck_stop (struct ev_check *w)
780{
781 checks [w->active - 1] = checks [--checkcnt];
782 ev_stop ((W)w);
783}
784
785/*****************************************************************************/
786
787#if 1
788
789struct ev_io wio;
790
791static void
792sin_cb (struct ev_io *w, int revents)
793{
794 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
795}
796
797static void
798ocb (struct ev_timer *w, int revents)
799{
800 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
801 evtimer_stop (w);
802 evtimer_start (w);
803}
804
805static void
806scb (struct ev_signal *w, int revents)
807{
808 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
809 evio_stop (&wio);
810 evio_start (&wio);
811}
812
813static void
814gcb (struct ev_signal *w, int revents)
815{
816 fprintf (stderr, "generic %x\n", revents);
817
818}
819
820int main (void)
821{
822 ev_init (0);
823
824 evio_init (&wio, sin_cb, 0, EV_READ);
825 evio_start (&wio);
826
827 struct ev_timer t[10000];
828
829#if 0
830 int i;
831 for (i = 0; i < 10000; ++i)
832 {
833 struct ev_timer *w = t + i;
834 evw_init (w, ocb, i);
835 evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
836 evtimer_start (w);
837 if (drand48 () < 0.5)
838 evtimer_stop (w);
839 }
840#endif 3678#endif
841 3679
842 struct ev_timer t1; 3680#if EV_MULTIPLICITY
843 evtimer_init (&t1, ocb, 5, 10); 3681 #include "ev_wrap.h"
844 evtimer_start (&t1);
845
846 struct ev_signal sig;
847 evsignal_init (&sig, scb, SIGQUIT);
848 evsignal_start (&sig);
849
850 struct ev_check cw;
851 evcheck_init (&cw, gcb);
852 evcheck_start (&cw);
853
854 struct ev_idle iw;
855 evidle_init (&iw, gcb);
856 evidle_start (&iw);
857
858 ev_loop (0);
859
860 return 0;
861}
862
863#endif 3682#endif
864 3683
3684#ifdef __cplusplus
3685}
3686#endif
865 3687
866
867

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