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Revision: 1.198
Committed: Sun Dec 23 04:45:51 2007 UTC (16 years, 6 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.197: +2 -0 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials provided
17 * with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifdef __cplusplus
33 extern "C" {
34 #endif
35
36 #ifndef EV_STANDALONE
37 # ifdef EV_CONFIG_H
38 # include EV_CONFIG_H
39 # else
40 # include "config.h"
41 # endif
42
43 # if HAVE_CLOCK_GETTIME
44 # ifndef EV_USE_MONOTONIC
45 # define EV_USE_MONOTONIC 1
46 # endif
47 # ifndef EV_USE_REALTIME
48 # define EV_USE_REALTIME 1
49 # endif
50 # else
51 # ifndef EV_USE_MONOTONIC
52 # define EV_USE_MONOTONIC 0
53 # endif
54 # ifndef EV_USE_REALTIME
55 # define EV_USE_REALTIME 0
56 # endif
57 # endif
58
59 # ifndef EV_USE_NANOSLEEP
60 # if HAVE_NANOSLEEP
61 # define EV_USE_NANOSLEEP 1
62 # else
63 # define EV_USE_NANOSLEEP 0
64 # endif
65 # endif
66
67 # ifndef EV_USE_SELECT
68 # if HAVE_SELECT && HAVE_SYS_SELECT_H
69 # define EV_USE_SELECT 1
70 # else
71 # define EV_USE_SELECT 0
72 # endif
73 # endif
74
75 # ifndef EV_USE_POLL
76 # if HAVE_POLL && HAVE_POLL_H
77 # define EV_USE_POLL 1
78 # else
79 # define EV_USE_POLL 0
80 # endif
81 # endif
82
83 # ifndef EV_USE_EPOLL
84 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
85 # define EV_USE_EPOLL 1
86 # else
87 # define EV_USE_EPOLL 0
88 # endif
89 # endif
90
91 # ifndef EV_USE_KQUEUE
92 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
93 # define EV_USE_KQUEUE 1
94 # else
95 # define EV_USE_KQUEUE 0
96 # endif
97 # endif
98
99 # ifndef EV_USE_PORT
100 # if HAVE_PORT_H && HAVE_PORT_CREATE
101 # define EV_USE_PORT 1
102 # else
103 # define EV_USE_PORT 0
104 # endif
105 # endif
106
107 # ifndef EV_USE_INOTIFY
108 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
109 # define EV_USE_INOTIFY 1
110 # else
111 # define EV_USE_INOTIFY 0
112 # endif
113 # endif
114
115 #endif
116
117 #include <math.h>
118 #include <stdlib.h>
119 #include <fcntl.h>
120 #include <stddef.h>
121
122 #include <stdio.h>
123
124 #include <assert.h>
125 #include <errno.h>
126 #include <sys/types.h>
127 #include <time.h>
128
129 #include <signal.h>
130
131 #ifdef EV_H
132 # include EV_H
133 #else
134 # include "ev.h"
135 #endif
136
137 #ifndef _WIN32
138 # include <sys/time.h>
139 # include <sys/wait.h>
140 # include <unistd.h>
141 #else
142 # define WIN32_LEAN_AND_MEAN
143 # include <windows.h>
144 # ifndef EV_SELECT_IS_WINSOCKET
145 # define EV_SELECT_IS_WINSOCKET 1
146 # endif
147 #endif
148
149 /**/
150
151 #ifndef EV_USE_MONOTONIC
152 # define EV_USE_MONOTONIC 0
153 #endif
154
155 #ifndef EV_USE_REALTIME
156 # define EV_USE_REALTIME 0
157 #endif
158
159 #ifndef EV_USE_NANOSLEEP
160 # define EV_USE_NANOSLEEP 0
161 #endif
162
163 #ifndef EV_USE_SELECT
164 # define EV_USE_SELECT 1
165 #endif
166
167 #ifndef EV_USE_POLL
168 # ifdef _WIN32
169 # define EV_USE_POLL 0
170 # else
171 # define EV_USE_POLL 1
172 # endif
173 #endif
174
175 #ifndef EV_USE_EPOLL
176 # define EV_USE_EPOLL 0
177 #endif
178
179 #ifndef EV_USE_KQUEUE
180 # define EV_USE_KQUEUE 0
181 #endif
182
183 #ifndef EV_USE_PORT
184 # define EV_USE_PORT 0
185 #endif
186
187 #ifndef EV_USE_INOTIFY
188 # define EV_USE_INOTIFY 0
189 #endif
190
191 #ifndef EV_PID_HASHSIZE
192 # if EV_MINIMAL
193 # define EV_PID_HASHSIZE 1
194 # else
195 # define EV_PID_HASHSIZE 16
196 # endif
197 #endif
198
199 #ifndef EV_INOTIFY_HASHSIZE
200 # if EV_MINIMAL
201 # define EV_INOTIFY_HASHSIZE 1
202 # else
203 # define EV_INOTIFY_HASHSIZE 16
204 # endif
205 #endif
206
207 /**/
208
209 #ifndef CLOCK_MONOTONIC
210 # undef EV_USE_MONOTONIC
211 # define EV_USE_MONOTONIC 0
212 #endif
213
214 #ifndef CLOCK_REALTIME
215 # undef EV_USE_REALTIME
216 # define EV_USE_REALTIME 0
217 #endif
218
219 #if !EV_STAT_ENABLE
220 # undef EV_USE_INOTIFY
221 # define EV_USE_INOTIFY 0
222 #endif
223
224 #if !EV_USE_NANOSLEEP
225 # ifndef _WIN32
226 # include <sys/select.h>
227 # endif
228 #endif
229
230 #if EV_USE_INOTIFY
231 # include <sys/inotify.h>
232 #endif
233
234 #if EV_SELECT_IS_WINSOCKET
235 # include <winsock.h>
236 #endif
237
238 /**/
239
240 /*
241 * This is used to avoid floating point rounding problems.
242 * It is added to ev_rt_now when scheduling periodics
243 * to ensure progress, time-wise, even when rounding
244 * errors are against us.
245 * This value is good at least till the year 4000.
246 * Better solutions welcome.
247 */
248 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
249
250 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
251 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
252 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
253
254 #if __GNUC__ >= 4
255 # define expect(expr,value) __builtin_expect ((expr),(value))
256 # define noinline __attribute__ ((noinline))
257 #else
258 # define expect(expr,value) (expr)
259 # define noinline
260 # if __STDC_VERSION__ < 199901L
261 # define inline
262 # endif
263 #endif
264
265 #define expect_false(expr) expect ((expr) != 0, 0)
266 #define expect_true(expr) expect ((expr) != 0, 1)
267 #define inline_size static inline
268
269 #if EV_MINIMAL
270 # define inline_speed static noinline
271 #else
272 # define inline_speed static inline
273 #endif
274
275 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
276 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
277
278 #define EMPTY /* required for microsofts broken pseudo-c compiler */
279 #define EMPTY2(a,b) /* used to suppress some warnings */
280
281 typedef ev_watcher *W;
282 typedef ev_watcher_list *WL;
283 typedef ev_watcher_time *WT;
284
285 #if EV_USE_MONOTONIC
286 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
287 /* giving it a reasonably high chance of working on typical architetcures */
288 static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
289 #endif
290
291 #ifdef _WIN32
292 # include "ev_win32.c"
293 #endif
294
295 /*****************************************************************************/
296
297 static void (*syserr_cb)(const char *msg);
298
299 void
300 ev_set_syserr_cb (void (*cb)(const char *msg))
301 {
302 syserr_cb = cb;
303 }
304
305 static void noinline
306 syserr (const char *msg)
307 {
308 if (!msg)
309 msg = "(libev) system error";
310
311 if (syserr_cb)
312 syserr_cb (msg);
313 else
314 {
315 perror (msg);
316 abort ();
317 }
318 }
319
320 static void *(*alloc)(void *ptr, long size);
321
322 void
323 ev_set_allocator (void *(*cb)(void *ptr, long size))
324 {
325 alloc = cb;
326 }
327
328 inline_speed void *
329 ev_realloc (void *ptr, long size)
330 {
331 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
332
333 if (!ptr && size)
334 {
335 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
336 abort ();
337 }
338
339 return ptr;
340 }
341
342 #define ev_malloc(size) ev_realloc (0, (size))
343 #define ev_free(ptr) ev_realloc ((ptr), 0)
344
345 /*****************************************************************************/
346
347 typedef struct
348 {
349 WL head;
350 unsigned char events;
351 unsigned char reify;
352 #if EV_SELECT_IS_WINSOCKET
353 SOCKET handle;
354 #endif
355 } ANFD;
356
357 typedef struct
358 {
359 W w;
360 int events;
361 } ANPENDING;
362
363 #if EV_USE_INOTIFY
364 typedef struct
365 {
366 WL head;
367 } ANFS;
368 #endif
369
370 #if EV_MULTIPLICITY
371
372 struct ev_loop
373 {
374 ev_tstamp ev_rt_now;
375 #define ev_rt_now ((loop)->ev_rt_now)
376 #define VAR(name,decl) decl;
377 #include "ev_vars.h"
378 #undef VAR
379 };
380 #include "ev_wrap.h"
381
382 static struct ev_loop default_loop_struct;
383 struct ev_loop *ev_default_loop_ptr;
384
385 #else
386
387 ev_tstamp ev_rt_now;
388 #define VAR(name,decl) static decl;
389 #include "ev_vars.h"
390 #undef VAR
391
392 static int ev_default_loop_ptr;
393
394 #endif
395
396 /*****************************************************************************/
397
398 ev_tstamp
399 ev_time (void)
400 {
401 #if EV_USE_REALTIME
402 struct timespec ts;
403 clock_gettime (CLOCK_REALTIME, &ts);
404 return ts.tv_sec + ts.tv_nsec * 1e-9;
405 #else
406 struct timeval tv;
407 gettimeofday (&tv, 0);
408 return tv.tv_sec + tv.tv_usec * 1e-6;
409 #endif
410 }
411
412 ev_tstamp inline_size
413 get_clock (void)
414 {
415 #if EV_USE_MONOTONIC
416 if (expect_true (have_monotonic))
417 {
418 struct timespec ts;
419 clock_gettime (CLOCK_MONOTONIC, &ts);
420 return ts.tv_sec + ts.tv_nsec * 1e-9;
421 }
422 #endif
423
424 return ev_time ();
425 }
426
427 #if EV_MULTIPLICITY
428 ev_tstamp
429 ev_now (EV_P)
430 {
431 return ev_rt_now;
432 }
433 #endif
434
435 void
436 ev_sleep (ev_tstamp delay)
437 {
438 if (delay > 0.)
439 {
440 #if EV_USE_NANOSLEEP
441 struct timespec ts;
442
443 ts.tv_sec = (time_t)delay;
444 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
445
446 nanosleep (&ts, 0);
447 #elif defined(_WIN32)
448 Sleep (delay * 1e3);
449 #else
450 struct timeval tv;
451
452 tv.tv_sec = (time_t)delay;
453 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
454
455 select (0, 0, 0, 0, &tv);
456 #endif
457 }
458 }
459
460 /*****************************************************************************/
461
462 int inline_size
463 array_nextsize (int elem, int cur, int cnt)
464 {
465 int ncur = cur + 1;
466
467 do
468 ncur <<= 1;
469 while (cnt > ncur);
470
471 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
472 if (elem * ncur > 4096)
473 {
474 ncur *= elem;
475 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
476 ncur = ncur - sizeof (void *) * 4;
477 ncur /= elem;
478 }
479
480 return ncur;
481 }
482
483 static noinline void *
484 array_realloc (int elem, void *base, int *cur, int cnt)
485 {
486 *cur = array_nextsize (elem, *cur, cnt);
487 return ev_realloc (base, elem * *cur);
488 }
489
490 #define array_needsize(type,base,cur,cnt,init) \
491 if (expect_false ((cnt) > (cur))) \
492 { \
493 int ocur_ = (cur); \
494 (base) = (type *)array_realloc \
495 (sizeof (type), (base), &(cur), (cnt)); \
496 init ((base) + (ocur_), (cur) - ocur_); \
497 }
498
499 #if 0
500 #define array_slim(type,stem) \
501 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
502 { \
503 stem ## max = array_roundsize (stem ## cnt >> 1); \
504 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
505 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
506 }
507 #endif
508
509 #define array_free(stem, idx) \
510 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
511
512 /*****************************************************************************/
513
514 void noinline
515 ev_feed_event (EV_P_ void *w, int revents)
516 {
517 W w_ = (W)w;
518 int pri = ABSPRI (w_);
519
520 if (expect_false (w_->pending))
521 pendings [pri][w_->pending - 1].events |= revents;
522 else
523 {
524 w_->pending = ++pendingcnt [pri];
525 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
526 pendings [pri][w_->pending - 1].w = w_;
527 pendings [pri][w_->pending - 1].events = revents;
528 }
529 }
530
531 void inline_speed
532 queue_events (EV_P_ W *events, int eventcnt, int type)
533 {
534 int i;
535
536 for (i = 0; i < eventcnt; ++i)
537 ev_feed_event (EV_A_ events [i], type);
538 }
539
540 /*****************************************************************************/
541
542 void inline_size
543 anfds_init (ANFD *base, int count)
544 {
545 while (count--)
546 {
547 base->head = 0;
548 base->events = EV_NONE;
549 base->reify = 0;
550
551 ++base;
552 }
553 }
554
555 void inline_speed
556 fd_event (EV_P_ int fd, int revents)
557 {
558 ANFD *anfd = anfds + fd;
559 ev_io *w;
560
561 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
562 {
563 int ev = w->events & revents;
564
565 if (ev)
566 ev_feed_event (EV_A_ (W)w, ev);
567 }
568 }
569
570 void
571 ev_feed_fd_event (EV_P_ int fd, int revents)
572 {
573 if (fd >= 0 && fd < anfdmax)
574 fd_event (EV_A_ fd, revents);
575 }
576
577 void inline_size
578 fd_reify (EV_P)
579 {
580 int i;
581
582 for (i = 0; i < fdchangecnt; ++i)
583 {
584 int fd = fdchanges [i];
585 ANFD *anfd = anfds + fd;
586 ev_io *w;
587
588 unsigned char events = 0;
589
590 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
591 events |= (unsigned char)w->events;
592
593 #if EV_SELECT_IS_WINSOCKET
594 if (events)
595 {
596 unsigned long argp;
597 anfd->handle = _get_osfhandle (fd);
598 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
599 }
600 #endif
601
602 {
603 unsigned char o_events = anfd->events;
604 unsigned char o_reify = anfd->reify;
605
606 anfd->reify = 0;
607 anfd->events = events;
608
609 if (o_events != events || o_reify & EV_IOFDSET)
610 backend_modify (EV_A_ fd, o_events, events);
611 }
612 }
613
614 fdchangecnt = 0;
615 }
616
617 void inline_size
618 fd_change (EV_P_ int fd, int flags)
619 {
620 unsigned char reify = anfds [fd].reify;
621 anfds [fd].reify |= flags;
622
623 if (expect_true (!reify))
624 {
625 ++fdchangecnt;
626 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
627 fdchanges [fdchangecnt - 1] = fd;
628 }
629 }
630
631 void inline_speed
632 fd_kill (EV_P_ int fd)
633 {
634 ev_io *w;
635
636 while ((w = (ev_io *)anfds [fd].head))
637 {
638 ev_io_stop (EV_A_ w);
639 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
640 }
641 }
642
643 int inline_size
644 fd_valid (int fd)
645 {
646 #ifdef _WIN32
647 return _get_osfhandle (fd) != -1;
648 #else
649 return fcntl (fd, F_GETFD) != -1;
650 #endif
651 }
652
653 /* called on EBADF to verify fds */
654 static void noinline
655 fd_ebadf (EV_P)
656 {
657 int fd;
658
659 for (fd = 0; fd < anfdmax; ++fd)
660 if (anfds [fd].events)
661 if (!fd_valid (fd) == -1 && errno == EBADF)
662 fd_kill (EV_A_ fd);
663 }
664
665 /* called on ENOMEM in select/poll to kill some fds and retry */
666 static void noinline
667 fd_enomem (EV_P)
668 {
669 int fd;
670
671 for (fd = anfdmax; fd--; )
672 if (anfds [fd].events)
673 {
674 fd_kill (EV_A_ fd);
675 return;
676 }
677 }
678
679 /* usually called after fork if backend needs to re-arm all fds from scratch */
680 static void noinline
681 fd_rearm_all (EV_P)
682 {
683 int fd;
684
685 for (fd = 0; fd < anfdmax; ++fd)
686 if (anfds [fd].events)
687 {
688 anfds [fd].events = 0;
689 fd_change (EV_A_ fd, EV_IOFDSET | 1);
690 }
691 }
692
693 /*****************************************************************************/
694
695 void inline_speed
696 upheap (WT *heap, int k)
697 {
698 WT w = heap [k];
699
700 while (k)
701 {
702 int p = (k - 1) >> 1;
703
704 if (heap [p]->at <= w->at)
705 break;
706
707 heap [k] = heap [p];
708 ((W)heap [k])->active = k + 1;
709 k = p;
710 }
711
712 heap [k] = w;
713 ((W)heap [k])->active = k + 1;
714 }
715
716 void inline_speed
717 downheap (WT *heap, int N, int k)
718 {
719 WT w = heap [k];
720
721 for (;;)
722 {
723 int c = (k << 1) + 1;
724
725 if (c >= N)
726 break;
727
728 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
729 ? 1 : 0;
730
731 if (w->at <= heap [c]->at)
732 break;
733
734 heap [k] = heap [c];
735 ((W)heap [k])->active = k + 1;
736
737 k = c;
738 }
739
740 heap [k] = w;
741 ((W)heap [k])->active = k + 1;
742 }
743
744 void inline_size
745 adjustheap (WT *heap, int N, int k)
746 {
747 upheap (heap, k);
748 downheap (heap, N, k);
749 }
750
751 /*****************************************************************************/
752
753 typedef struct
754 {
755 WL head;
756 sig_atomic_t volatile gotsig;
757 } ANSIG;
758
759 static ANSIG *signals;
760 static int signalmax;
761
762 static int sigpipe [2];
763 static sig_atomic_t volatile gotsig;
764 static ev_io sigev;
765
766 void inline_size
767 signals_init (ANSIG *base, int count)
768 {
769 while (count--)
770 {
771 base->head = 0;
772 base->gotsig = 0;
773
774 ++base;
775 }
776 }
777
778 static void
779 sighandler (int signum)
780 {
781 #if _WIN32
782 signal (signum, sighandler);
783 #endif
784
785 signals [signum - 1].gotsig = 1;
786
787 if (!gotsig)
788 {
789 int old_errno = errno;
790 gotsig = 1;
791 write (sigpipe [1], &signum, 1);
792 errno = old_errno;
793 }
794 }
795
796 void noinline
797 ev_feed_signal_event (EV_P_ int signum)
798 {
799 WL w;
800
801 #if EV_MULTIPLICITY
802 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
803 #endif
804
805 --signum;
806
807 if (signum < 0 || signum >= signalmax)
808 return;
809
810 signals [signum].gotsig = 0;
811
812 for (w = signals [signum].head; w; w = w->next)
813 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
814 }
815
816 static void
817 sigcb (EV_P_ ev_io *iow, int revents)
818 {
819 int signum;
820
821 read (sigpipe [0], &revents, 1);
822 gotsig = 0;
823
824 for (signum = signalmax; signum--; )
825 if (signals [signum].gotsig)
826 ev_feed_signal_event (EV_A_ signum + 1);
827 }
828
829 void inline_speed
830 fd_intern (int fd)
831 {
832 #ifdef _WIN32
833 int arg = 1;
834 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
835 #else
836 fcntl (fd, F_SETFD, FD_CLOEXEC);
837 fcntl (fd, F_SETFL, O_NONBLOCK);
838 #endif
839 }
840
841 static void noinline
842 siginit (EV_P)
843 {
844 fd_intern (sigpipe [0]);
845 fd_intern (sigpipe [1]);
846
847 ev_io_set (&sigev, sigpipe [0], EV_READ);
848 ev_io_start (EV_A_ &sigev);
849 ev_unref (EV_A); /* child watcher should not keep loop alive */
850 }
851
852 /*****************************************************************************/
853
854 static WL childs [EV_PID_HASHSIZE];
855
856 #ifndef _WIN32
857
858 static ev_signal childev;
859
860 void inline_speed
861 child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
862 {
863 ev_child *w;
864
865 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
866 if (w->pid == pid || !w->pid)
867 {
868 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
869 w->rpid = pid;
870 w->rstatus = status;
871 ev_feed_event (EV_A_ (W)w, EV_CHILD);
872 }
873 }
874
875 #ifndef WCONTINUED
876 # define WCONTINUED 0
877 #endif
878
879 static void
880 childcb (EV_P_ ev_signal *sw, int revents)
881 {
882 int pid, status;
883
884 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
885 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
886 if (!WCONTINUED
887 || errno != EINVAL
888 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
889 return;
890
891 /* make sure we are called again until all childs have been reaped */
892 /* we need to do it this way so that the callback gets called before we continue */
893 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
894
895 child_reap (EV_A_ sw, pid, pid, status);
896 if (EV_PID_HASHSIZE > 1)
897 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
898 }
899
900 #endif
901
902 /*****************************************************************************/
903
904 #if EV_USE_PORT
905 # include "ev_port.c"
906 #endif
907 #if EV_USE_KQUEUE
908 # include "ev_kqueue.c"
909 #endif
910 #if EV_USE_EPOLL
911 # include "ev_epoll.c"
912 #endif
913 #if EV_USE_POLL
914 # include "ev_poll.c"
915 #endif
916 #if EV_USE_SELECT
917 # include "ev_select.c"
918 #endif
919
920 int
921 ev_version_major (void)
922 {
923 return EV_VERSION_MAJOR;
924 }
925
926 int
927 ev_version_minor (void)
928 {
929 return EV_VERSION_MINOR;
930 }
931
932 /* return true if we are running with elevated privileges and should ignore env variables */
933 int inline_size
934 enable_secure (void)
935 {
936 #ifdef _WIN32
937 return 0;
938 #else
939 return getuid () != geteuid ()
940 || getgid () != getegid ();
941 #endif
942 }
943
944 unsigned int
945 ev_supported_backends (void)
946 {
947 unsigned int flags = 0;
948
949 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
950 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
951 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
952 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
953 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
954
955 return flags;
956 }
957
958 unsigned int
959 ev_recommended_backends (void)
960 {
961 unsigned int flags = ev_supported_backends ();
962
963 #ifndef __NetBSD__
964 /* kqueue is borked on everything but netbsd apparently */
965 /* it usually doesn't work correctly on anything but sockets and pipes */
966 flags &= ~EVBACKEND_KQUEUE;
967 #endif
968 #ifdef __APPLE__
969 // flags &= ~EVBACKEND_KQUEUE; for documentation
970 flags &= ~EVBACKEND_POLL;
971 #endif
972
973 return flags;
974 }
975
976 unsigned int
977 ev_embeddable_backends (void)
978 {
979 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
980
981 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
982 /* please fix it and tell me how to detect the fix */
983 flags &= ~EVBACKEND_EPOLL;
984
985 return flags;
986 }
987
988 unsigned int
989 ev_backend (EV_P)
990 {
991 return backend;
992 }
993
994 unsigned int
995 ev_loop_count (EV_P)
996 {
997 return loop_count;
998 }
999
1000 void
1001 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1002 {
1003 io_blocktime = interval;
1004 }
1005
1006 void
1007 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1008 {
1009 timeout_blocktime = interval;
1010 }
1011
1012 static void noinline
1013 loop_init (EV_P_ unsigned int flags)
1014 {
1015 if (!backend)
1016 {
1017 #if EV_USE_MONOTONIC
1018 {
1019 struct timespec ts;
1020 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1021 have_monotonic = 1;
1022 }
1023 #endif
1024
1025 ev_rt_now = ev_time ();
1026 mn_now = get_clock ();
1027 now_floor = mn_now;
1028 rtmn_diff = ev_rt_now - mn_now;
1029
1030 io_blocktime = 0.;
1031 timeout_blocktime = 0.;
1032
1033 /* pid check not overridable via env */
1034 #ifndef _WIN32
1035 if (flags & EVFLAG_FORKCHECK)
1036 curpid = getpid ();
1037 #endif
1038
1039 if (!(flags & EVFLAG_NOENV)
1040 && !enable_secure ()
1041 && getenv ("LIBEV_FLAGS"))
1042 flags = atoi (getenv ("LIBEV_FLAGS"));
1043
1044 if (!(flags & 0x0000ffffUL))
1045 flags |= ev_recommended_backends ();
1046
1047 backend = 0;
1048 backend_fd = -1;
1049 #if EV_USE_INOTIFY
1050 fs_fd = -2;
1051 #endif
1052
1053 #if EV_USE_PORT
1054 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1055 #endif
1056 #if EV_USE_KQUEUE
1057 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1058 #endif
1059 #if EV_USE_EPOLL
1060 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1061 #endif
1062 #if EV_USE_POLL
1063 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1064 #endif
1065 #if EV_USE_SELECT
1066 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1067 #endif
1068
1069 ev_init (&sigev, sigcb);
1070 ev_set_priority (&sigev, EV_MAXPRI);
1071 }
1072 }
1073
1074 static void noinline
1075 loop_destroy (EV_P)
1076 {
1077 int i;
1078
1079 #if EV_USE_INOTIFY
1080 if (fs_fd >= 0)
1081 close (fs_fd);
1082 #endif
1083
1084 if (backend_fd >= 0)
1085 close (backend_fd);
1086
1087 #if EV_USE_PORT
1088 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1089 #endif
1090 #if EV_USE_KQUEUE
1091 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1092 #endif
1093 #if EV_USE_EPOLL
1094 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1095 #endif
1096 #if EV_USE_POLL
1097 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1098 #endif
1099 #if EV_USE_SELECT
1100 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1101 #endif
1102
1103 for (i = NUMPRI; i--; )
1104 {
1105 array_free (pending, [i]);
1106 #if EV_IDLE_ENABLE
1107 array_free (idle, [i]);
1108 #endif
1109 }
1110
1111 ev_free (anfds); anfdmax = 0;
1112
1113 /* have to use the microsoft-never-gets-it-right macro */
1114 array_free (fdchange, EMPTY);
1115 array_free (timer, EMPTY);
1116 #if EV_PERIODIC_ENABLE
1117 array_free (periodic, EMPTY);
1118 #endif
1119 #if EV_FORK_ENABLE
1120 array_free (fork, EMPTY);
1121 #endif
1122 array_free (prepare, EMPTY);
1123 array_free (check, EMPTY);
1124
1125 backend = 0;
1126 }
1127
1128 void inline_size infy_fork (EV_P);
1129
1130 void inline_size
1131 loop_fork (EV_P)
1132 {
1133 #if EV_USE_PORT
1134 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1135 #endif
1136 #if EV_USE_KQUEUE
1137 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1138 #endif
1139 #if EV_USE_EPOLL
1140 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1141 #endif
1142 #if EV_USE_INOTIFY
1143 infy_fork (EV_A);
1144 #endif
1145
1146 if (ev_is_active (&sigev))
1147 {
1148 /* default loop */
1149
1150 ev_ref (EV_A);
1151 ev_io_stop (EV_A_ &sigev);
1152 close (sigpipe [0]);
1153 close (sigpipe [1]);
1154
1155 while (pipe (sigpipe))
1156 syserr ("(libev) error creating pipe");
1157
1158 siginit (EV_A);
1159 }
1160
1161 postfork = 0;
1162 }
1163
1164 #if EV_MULTIPLICITY
1165 struct ev_loop *
1166 ev_loop_new (unsigned int flags)
1167 {
1168 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1169
1170 memset (loop, 0, sizeof (struct ev_loop));
1171
1172 loop_init (EV_A_ flags);
1173
1174 if (ev_backend (EV_A))
1175 return loop;
1176
1177 return 0;
1178 }
1179
1180 void
1181 ev_loop_destroy (EV_P)
1182 {
1183 loop_destroy (EV_A);
1184 ev_free (loop);
1185 }
1186
1187 void
1188 ev_loop_fork (EV_P)
1189 {
1190 postfork = 1;
1191 }
1192
1193 #endif
1194
1195 #if EV_MULTIPLICITY
1196 struct ev_loop *
1197 ev_default_loop_init (unsigned int flags)
1198 #else
1199 int
1200 ev_default_loop (unsigned int flags)
1201 #endif
1202 {
1203 if (sigpipe [0] == sigpipe [1])
1204 if (pipe (sigpipe))
1205 return 0;
1206
1207 if (!ev_default_loop_ptr)
1208 {
1209 #if EV_MULTIPLICITY
1210 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1211 #else
1212 ev_default_loop_ptr = 1;
1213 #endif
1214
1215 loop_init (EV_A_ flags);
1216
1217 if (ev_backend (EV_A))
1218 {
1219 siginit (EV_A);
1220
1221 #ifndef _WIN32
1222 ev_signal_init (&childev, childcb, SIGCHLD);
1223 ev_set_priority (&childev, EV_MAXPRI);
1224 ev_signal_start (EV_A_ &childev);
1225 ev_unref (EV_A); /* child watcher should not keep loop alive */
1226 #endif
1227 }
1228 else
1229 ev_default_loop_ptr = 0;
1230 }
1231
1232 return ev_default_loop_ptr;
1233 }
1234
1235 void
1236 ev_default_destroy (void)
1237 {
1238 #if EV_MULTIPLICITY
1239 struct ev_loop *loop = ev_default_loop_ptr;
1240 #endif
1241
1242 #ifndef _WIN32
1243 ev_ref (EV_A); /* child watcher */
1244 ev_signal_stop (EV_A_ &childev);
1245 #endif
1246
1247 ev_ref (EV_A); /* signal watcher */
1248 ev_io_stop (EV_A_ &sigev);
1249
1250 close (sigpipe [0]); sigpipe [0] = 0;
1251 close (sigpipe [1]); sigpipe [1] = 0;
1252
1253 loop_destroy (EV_A);
1254 }
1255
1256 void
1257 ev_default_fork (void)
1258 {
1259 #if EV_MULTIPLICITY
1260 struct ev_loop *loop = ev_default_loop_ptr;
1261 #endif
1262
1263 if (backend)
1264 postfork = 1;
1265 }
1266
1267 /*****************************************************************************/
1268
1269 void
1270 ev_invoke (EV_P_ void *w, int revents)
1271 {
1272 EV_CB_INVOKE ((W)w, revents);
1273 }
1274
1275 void inline_speed
1276 call_pending (EV_P)
1277 {
1278 int pri;
1279
1280 for (pri = NUMPRI; pri--; )
1281 while (pendingcnt [pri])
1282 {
1283 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1284
1285 if (expect_true (p->w))
1286 {
1287 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1288
1289 p->w->pending = 0;
1290 EV_CB_INVOKE (p->w, p->events);
1291 }
1292 }
1293 }
1294
1295 void inline_size
1296 timers_reify (EV_P)
1297 {
1298 while (timercnt && ((WT)timers [0])->at <= mn_now)
1299 {
1300 ev_timer *w = (ev_timer *)timers [0];
1301
1302 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1303
1304 /* first reschedule or stop timer */
1305 if (w->repeat)
1306 {
1307 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1308
1309 ((WT)w)->at += w->repeat;
1310 if (((WT)w)->at < mn_now)
1311 ((WT)w)->at = mn_now;
1312
1313 downheap (timers, timercnt, 0);
1314 }
1315 else
1316 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1317
1318 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1319 }
1320 }
1321
1322 #if EV_PERIODIC_ENABLE
1323 void inline_size
1324 periodics_reify (EV_P)
1325 {
1326 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1327 {
1328 ev_periodic *w = (ev_periodic *)periodics [0];
1329
1330 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1331
1332 /* first reschedule or stop timer */
1333 if (w->reschedule_cb)
1334 {
1335 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1336 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1337 downheap (periodics, periodiccnt, 0);
1338 }
1339 else if (w->interval)
1340 {
1341 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1342 if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
1343 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1344 downheap (periodics, periodiccnt, 0);
1345 }
1346 else
1347 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1348
1349 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1350 }
1351 }
1352
1353 static void noinline
1354 periodics_reschedule (EV_P)
1355 {
1356 int i;
1357
1358 /* adjust periodics after time jump */
1359 for (i = 0; i < periodiccnt; ++i)
1360 {
1361 ev_periodic *w = (ev_periodic *)periodics [i];
1362
1363 if (w->reschedule_cb)
1364 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1365 else if (w->interval)
1366 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1367 }
1368
1369 /* now rebuild the heap */
1370 for (i = periodiccnt >> 1; i--; )
1371 downheap (periodics, periodiccnt, i);
1372 }
1373 #endif
1374
1375 #if EV_IDLE_ENABLE
1376 void inline_size
1377 idle_reify (EV_P)
1378 {
1379 if (expect_false (idleall))
1380 {
1381 int pri;
1382
1383 for (pri = NUMPRI; pri--; )
1384 {
1385 if (pendingcnt [pri])
1386 break;
1387
1388 if (idlecnt [pri])
1389 {
1390 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1391 break;
1392 }
1393 }
1394 }
1395 }
1396 #endif
1397
1398 void inline_speed
1399 time_update (EV_P_ ev_tstamp max_block)
1400 {
1401 int i;
1402
1403 #if EV_USE_MONOTONIC
1404 if (expect_true (have_monotonic))
1405 {
1406 ev_tstamp odiff = rtmn_diff;
1407
1408 mn_now = get_clock ();
1409
1410 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1411 /* interpolate in the meantime */
1412 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1413 {
1414 ev_rt_now = rtmn_diff + mn_now;
1415 return;
1416 }
1417
1418 now_floor = mn_now;
1419 ev_rt_now = ev_time ();
1420
1421 /* loop a few times, before making important decisions.
1422 * on the choice of "4": one iteration isn't enough,
1423 * in case we get preempted during the calls to
1424 * ev_time and get_clock. a second call is almost guaranteed
1425 * to succeed in that case, though. and looping a few more times
1426 * doesn't hurt either as we only do this on time-jumps or
1427 * in the unlikely event of having been preempted here.
1428 */
1429 for (i = 4; --i; )
1430 {
1431 rtmn_diff = ev_rt_now - mn_now;
1432
1433 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1434 return; /* all is well */
1435
1436 ev_rt_now = ev_time ();
1437 mn_now = get_clock ();
1438 now_floor = mn_now;
1439 }
1440
1441 # if EV_PERIODIC_ENABLE
1442 periodics_reschedule (EV_A);
1443 # endif
1444 /* no timer adjustment, as the monotonic clock doesn't jump */
1445 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1446 }
1447 else
1448 #endif
1449 {
1450 ev_rt_now = ev_time ();
1451
1452 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1453 {
1454 #if EV_PERIODIC_ENABLE
1455 periodics_reschedule (EV_A);
1456 #endif
1457 /* adjust timers. this is easy, as the offset is the same for all of them */
1458 for (i = 0; i < timercnt; ++i)
1459 ((WT)timers [i])->at += ev_rt_now - mn_now;
1460 }
1461
1462 mn_now = ev_rt_now;
1463 }
1464 }
1465
1466 void
1467 ev_ref (EV_P)
1468 {
1469 ++activecnt;
1470 }
1471
1472 void
1473 ev_unref (EV_P)
1474 {
1475 --activecnt;
1476 }
1477
1478 static int loop_done;
1479
1480 void
1481 ev_loop (EV_P_ int flags)
1482 {
1483 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1484 ? EVUNLOOP_ONE
1485 : EVUNLOOP_CANCEL;
1486
1487 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1488
1489 do
1490 {
1491 #ifndef _WIN32
1492 if (expect_false (curpid)) /* penalise the forking check even more */
1493 if (expect_false (getpid () != curpid))
1494 {
1495 curpid = getpid ();
1496 postfork = 1;
1497 }
1498 #endif
1499
1500 #if EV_FORK_ENABLE
1501 /* we might have forked, so queue fork handlers */
1502 if (expect_false (postfork))
1503 if (forkcnt)
1504 {
1505 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1506 call_pending (EV_A);
1507 }
1508 #endif
1509
1510 /* queue prepare watchers (and execute them) */
1511 if (expect_false (preparecnt))
1512 {
1513 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1514 call_pending (EV_A);
1515 }
1516
1517 if (expect_false (!activecnt))
1518 break;
1519
1520 /* we might have forked, so reify kernel state if necessary */
1521 if (expect_false (postfork))
1522 loop_fork (EV_A);
1523
1524 /* update fd-related kernel structures */
1525 fd_reify (EV_A);
1526
1527 /* calculate blocking time */
1528 {
1529 ev_tstamp waittime = 0.;
1530 ev_tstamp sleeptime = 0.;
1531
1532 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1533 {
1534 /* update time to cancel out callback processing overhead */
1535 time_update (EV_A_ 1e100);
1536
1537 waittime = MAX_BLOCKTIME;
1538
1539 if (timercnt)
1540 {
1541 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1542 if (waittime > to) waittime = to;
1543 }
1544
1545 #if EV_PERIODIC_ENABLE
1546 if (periodiccnt)
1547 {
1548 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1549 if (waittime > to) waittime = to;
1550 }
1551 #endif
1552
1553 if (expect_false (waittime < timeout_blocktime))
1554 waittime = timeout_blocktime;
1555
1556 sleeptime = waittime - backend_fudge;
1557
1558 if (expect_true (sleeptime > io_blocktime))
1559 sleeptime = io_blocktime;
1560
1561 if (sleeptime)
1562 {
1563 ev_sleep (sleeptime);
1564 waittime -= sleeptime;
1565 }
1566 }
1567
1568 ++loop_count;
1569 backend_poll (EV_A_ waittime);
1570
1571 /* update ev_rt_now, do magic */
1572 time_update (EV_A_ waittime + sleeptime);
1573 }
1574
1575 /* queue pending timers and reschedule them */
1576 timers_reify (EV_A); /* relative timers called last */
1577 #if EV_PERIODIC_ENABLE
1578 periodics_reify (EV_A); /* absolute timers called first */
1579 #endif
1580
1581 #if EV_IDLE_ENABLE
1582 /* queue idle watchers unless other events are pending */
1583 idle_reify (EV_A);
1584 #endif
1585
1586 /* queue check watchers, to be executed first */
1587 if (expect_false (checkcnt))
1588 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1589
1590 call_pending (EV_A);
1591
1592 }
1593 while (expect_true (activecnt && !loop_done));
1594
1595 if (loop_done == EVUNLOOP_ONE)
1596 loop_done = EVUNLOOP_CANCEL;
1597 }
1598
1599 void
1600 ev_unloop (EV_P_ int how)
1601 {
1602 loop_done = how;
1603 }
1604
1605 /*****************************************************************************/
1606
1607 void inline_size
1608 wlist_add (WL *head, WL elem)
1609 {
1610 elem->next = *head;
1611 *head = elem;
1612 }
1613
1614 void inline_size
1615 wlist_del (WL *head, WL elem)
1616 {
1617 while (*head)
1618 {
1619 if (*head == elem)
1620 {
1621 *head = elem->next;
1622 return;
1623 }
1624
1625 head = &(*head)->next;
1626 }
1627 }
1628
1629 void inline_speed
1630 clear_pending (EV_P_ W w)
1631 {
1632 if (w->pending)
1633 {
1634 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1635 w->pending = 0;
1636 }
1637 }
1638
1639 int
1640 ev_clear_pending (EV_P_ void *w)
1641 {
1642 W w_ = (W)w;
1643 int pending = w_->pending;
1644
1645 if (expect_true (pending))
1646 {
1647 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1648 w_->pending = 0;
1649 p->w = 0;
1650 return p->events;
1651 }
1652 else
1653 return 0;
1654 }
1655
1656 void inline_size
1657 pri_adjust (EV_P_ W w)
1658 {
1659 int pri = w->priority;
1660 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1661 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1662 w->priority = pri;
1663 }
1664
1665 void inline_speed
1666 ev_start (EV_P_ W w, int active)
1667 {
1668 pri_adjust (EV_A_ w);
1669 w->active = active;
1670 ev_ref (EV_A);
1671 }
1672
1673 void inline_size
1674 ev_stop (EV_P_ W w)
1675 {
1676 ev_unref (EV_A);
1677 w->active = 0;
1678 }
1679
1680 /*****************************************************************************/
1681
1682 void noinline
1683 ev_io_start (EV_P_ ev_io *w)
1684 {
1685 int fd = w->fd;
1686
1687 if (expect_false (ev_is_active (w)))
1688 return;
1689
1690 assert (("ev_io_start called with negative fd", fd >= 0));
1691
1692 ev_start (EV_A_ (W)w, 1);
1693 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1694 wlist_add (&anfds[fd].head, (WL)w);
1695
1696 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1697 w->events &= ~EV_IOFDSET;
1698 }
1699
1700 void noinline
1701 ev_io_stop (EV_P_ ev_io *w)
1702 {
1703 clear_pending (EV_A_ (W)w);
1704 if (expect_false (!ev_is_active (w)))
1705 return;
1706
1707 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1708
1709 wlist_del (&anfds[w->fd].head, (WL)w);
1710 ev_stop (EV_A_ (W)w);
1711
1712 fd_change (EV_A_ w->fd, 1);
1713 }
1714
1715 void noinline
1716 ev_timer_start (EV_P_ ev_timer *w)
1717 {
1718 if (expect_false (ev_is_active (w)))
1719 return;
1720
1721 ((WT)w)->at += mn_now;
1722
1723 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1724
1725 ev_start (EV_A_ (W)w, ++timercnt);
1726 array_needsize (WT, timers, timermax, timercnt, EMPTY2);
1727 timers [timercnt - 1] = (WT)w;
1728 upheap (timers, timercnt - 1);
1729
1730 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1731 }
1732
1733 void noinline
1734 ev_timer_stop (EV_P_ ev_timer *w)
1735 {
1736 clear_pending (EV_A_ (W)w);
1737 if (expect_false (!ev_is_active (w)))
1738 return;
1739
1740 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
1741
1742 {
1743 int active = ((W)w)->active;
1744
1745 if (expect_true (--active < --timercnt))
1746 {
1747 timers [active] = timers [timercnt];
1748 adjustheap (timers, timercnt, active);
1749 }
1750 }
1751
1752 ((WT)w)->at -= mn_now;
1753
1754 ev_stop (EV_A_ (W)w);
1755 }
1756
1757 void noinline
1758 ev_timer_again (EV_P_ ev_timer *w)
1759 {
1760 if (ev_is_active (w))
1761 {
1762 if (w->repeat)
1763 {
1764 ((WT)w)->at = mn_now + w->repeat;
1765 adjustheap (timers, timercnt, ((W)w)->active - 1);
1766 }
1767 else
1768 ev_timer_stop (EV_A_ w);
1769 }
1770 else if (w->repeat)
1771 {
1772 w->at = w->repeat;
1773 ev_timer_start (EV_A_ w);
1774 }
1775 }
1776
1777 #if EV_PERIODIC_ENABLE
1778 void noinline
1779 ev_periodic_start (EV_P_ ev_periodic *w)
1780 {
1781 if (expect_false (ev_is_active (w)))
1782 return;
1783
1784 if (w->reschedule_cb)
1785 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1786 else if (w->interval)
1787 {
1788 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1789 /* this formula differs from the one in periodic_reify because we do not always round up */
1790 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1791 }
1792 else
1793 ((WT)w)->at = w->offset;
1794
1795 ev_start (EV_A_ (W)w, ++periodiccnt);
1796 array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
1797 periodics [periodiccnt - 1] = (WT)w;
1798 upheap (periodics, periodiccnt - 1);
1799
1800 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1801 }
1802
1803 void noinline
1804 ev_periodic_stop (EV_P_ ev_periodic *w)
1805 {
1806 clear_pending (EV_A_ (W)w);
1807 if (expect_false (!ev_is_active (w)))
1808 return;
1809
1810 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
1811
1812 {
1813 int active = ((W)w)->active;
1814
1815 if (expect_true (--active < --periodiccnt))
1816 {
1817 periodics [active] = periodics [periodiccnt];
1818 adjustheap (periodics, periodiccnt, active);
1819 }
1820 }
1821
1822 ev_stop (EV_A_ (W)w);
1823 }
1824
1825 void noinline
1826 ev_periodic_again (EV_P_ ev_periodic *w)
1827 {
1828 /* TODO: use adjustheap and recalculation */
1829 ev_periodic_stop (EV_A_ w);
1830 ev_periodic_start (EV_A_ w);
1831 }
1832 #endif
1833
1834 #ifndef SA_RESTART
1835 # define SA_RESTART 0
1836 #endif
1837
1838 void noinline
1839 ev_signal_start (EV_P_ ev_signal *w)
1840 {
1841 #if EV_MULTIPLICITY
1842 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1843 #endif
1844 if (expect_false (ev_is_active (w)))
1845 return;
1846
1847 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1848
1849 {
1850 #ifndef _WIN32
1851 sigset_t full, prev;
1852 sigfillset (&full);
1853 sigprocmask (SIG_SETMASK, &full, &prev);
1854 #endif
1855
1856 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1857
1858 #ifndef _WIN32
1859 sigprocmask (SIG_SETMASK, &prev, 0);
1860 #endif
1861 }
1862
1863 ev_start (EV_A_ (W)w, 1);
1864 wlist_add (&signals [w->signum - 1].head, (WL)w);
1865
1866 if (!((WL)w)->next)
1867 {
1868 #if _WIN32
1869 signal (w->signum, sighandler);
1870 #else
1871 struct sigaction sa;
1872 sa.sa_handler = sighandler;
1873 sigfillset (&sa.sa_mask);
1874 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1875 sigaction (w->signum, &sa, 0);
1876 #endif
1877 }
1878 }
1879
1880 void noinline
1881 ev_signal_stop (EV_P_ ev_signal *w)
1882 {
1883 clear_pending (EV_A_ (W)w);
1884 if (expect_false (!ev_is_active (w)))
1885 return;
1886
1887 wlist_del (&signals [w->signum - 1].head, (WL)w);
1888 ev_stop (EV_A_ (W)w);
1889
1890 if (!signals [w->signum - 1].head)
1891 signal (w->signum, SIG_DFL);
1892 }
1893
1894 void
1895 ev_child_start (EV_P_ ev_child *w)
1896 {
1897 #if EV_MULTIPLICITY
1898 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1899 #endif
1900 if (expect_false (ev_is_active (w)))
1901 return;
1902
1903 ev_start (EV_A_ (W)w, 1);
1904 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1905 }
1906
1907 void
1908 ev_child_stop (EV_P_ ev_child *w)
1909 {
1910 clear_pending (EV_A_ (W)w);
1911 if (expect_false (!ev_is_active (w)))
1912 return;
1913
1914 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1915 ev_stop (EV_A_ (W)w);
1916 }
1917
1918 #if EV_STAT_ENABLE
1919
1920 # ifdef _WIN32
1921 # undef lstat
1922 # define lstat(a,b) _stati64 (a,b)
1923 # endif
1924
1925 #define DEF_STAT_INTERVAL 5.0074891
1926 #define MIN_STAT_INTERVAL 0.1074891
1927
1928 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
1929
1930 #if EV_USE_INOTIFY
1931 # define EV_INOTIFY_BUFSIZE 8192
1932
1933 static void noinline
1934 infy_add (EV_P_ ev_stat *w)
1935 {
1936 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);
1937
1938 if (w->wd < 0)
1939 {
1940 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
1941
1942 /* monitor some parent directory for speedup hints */
1943 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
1944 {
1945 char path [4096];
1946 strcpy (path, w->path);
1947
1948 do
1949 {
1950 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
1951 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
1952
1953 char *pend = strrchr (path, '/');
1954
1955 if (!pend)
1956 break; /* whoops, no '/', complain to your admin */
1957
1958 *pend = 0;
1959 w->wd = inotify_add_watch (fs_fd, path, mask);
1960 }
1961 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
1962 }
1963 }
1964 else
1965 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
1966
1967 if (w->wd >= 0)
1968 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
1969 }
1970
1971 static void noinline
1972 infy_del (EV_P_ ev_stat *w)
1973 {
1974 int slot;
1975 int wd = w->wd;
1976
1977 if (wd < 0)
1978 return;
1979
1980 w->wd = -2;
1981 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
1982 wlist_del (&fs_hash [slot].head, (WL)w);
1983
1984 /* remove this watcher, if others are watching it, they will rearm */
1985 inotify_rm_watch (fs_fd, wd);
1986 }
1987
1988 static void noinline
1989 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
1990 {
1991 if (slot < 0)
1992 /* overflow, need to check for all hahs slots */
1993 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1994 infy_wd (EV_A_ slot, wd, ev);
1995 else
1996 {
1997 WL w_;
1998
1999 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2000 {
2001 ev_stat *w = (ev_stat *)w_;
2002 w_ = w_->next; /* lets us remove this watcher and all before it */
2003
2004 if (w->wd == wd || wd == -1)
2005 {
2006 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2007 {
2008 w->wd = -1;
2009 infy_add (EV_A_ w); /* re-add, no matter what */
2010 }
2011
2012 stat_timer_cb (EV_A_ &w->timer, 0);
2013 }
2014 }
2015 }
2016 }
2017
2018 static void
2019 infy_cb (EV_P_ ev_io *w, int revents)
2020 {
2021 char buf [EV_INOTIFY_BUFSIZE];
2022 struct inotify_event *ev = (struct inotify_event *)buf;
2023 int ofs;
2024 int len = read (fs_fd, buf, sizeof (buf));
2025
2026 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2027 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2028 }
2029
2030 void inline_size
2031 infy_init (EV_P)
2032 {
2033 if (fs_fd != -2)
2034 return;
2035
2036 fs_fd = inotify_init ();
2037
2038 if (fs_fd >= 0)
2039 {
2040 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2041 ev_set_priority (&fs_w, EV_MAXPRI);
2042 ev_io_start (EV_A_ &fs_w);
2043 }
2044 }
2045
2046 void inline_size
2047 infy_fork (EV_P)
2048 {
2049 int slot;
2050
2051 if (fs_fd < 0)
2052 return;
2053
2054 close (fs_fd);
2055 fs_fd = inotify_init ();
2056
2057 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2058 {
2059 WL w_ = fs_hash [slot].head;
2060 fs_hash [slot].head = 0;
2061
2062 while (w_)
2063 {
2064 ev_stat *w = (ev_stat *)w_;
2065 w_ = w_->next; /* lets us add this watcher */
2066
2067 w->wd = -1;
2068
2069 if (fs_fd >= 0)
2070 infy_add (EV_A_ w); /* re-add, no matter what */
2071 else
2072 ev_timer_start (EV_A_ &w->timer);
2073 }
2074
2075 }
2076 }
2077
2078 #endif
2079
2080 void
2081 ev_stat_stat (EV_P_ ev_stat *w)
2082 {
2083 if (lstat (w->path, &w->attr) < 0)
2084 w->attr.st_nlink = 0;
2085 else if (!w->attr.st_nlink)
2086 w->attr.st_nlink = 1;
2087 }
2088
2089 static void noinline
2090 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2091 {
2092 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2093
2094 /* we copy this here each the time so that */
2095 /* prev has the old value when the callback gets invoked */
2096 w->prev = w->attr;
2097 ev_stat_stat (EV_A_ w);
2098
2099 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2100 if (
2101 w->prev.st_dev != w->attr.st_dev
2102 || w->prev.st_ino != w->attr.st_ino
2103 || w->prev.st_mode != w->attr.st_mode
2104 || w->prev.st_nlink != w->attr.st_nlink
2105 || w->prev.st_uid != w->attr.st_uid
2106 || w->prev.st_gid != w->attr.st_gid
2107 || w->prev.st_rdev != w->attr.st_rdev
2108 || w->prev.st_size != w->attr.st_size
2109 || w->prev.st_atime != w->attr.st_atime
2110 || w->prev.st_mtime != w->attr.st_mtime
2111 || w->prev.st_ctime != w->attr.st_ctime
2112 ) {
2113 #if EV_USE_INOTIFY
2114 infy_del (EV_A_ w);
2115 infy_add (EV_A_ w);
2116 ev_stat_stat (EV_A_ w); /* avoid race... */
2117 #endif
2118
2119 ev_feed_event (EV_A_ w, EV_STAT);
2120 }
2121 }
2122
2123 void
2124 ev_stat_start (EV_P_ ev_stat *w)
2125 {
2126 if (expect_false (ev_is_active (w)))
2127 return;
2128
2129 /* since we use memcmp, we need to clear any padding data etc. */
2130 memset (&w->prev, 0, sizeof (ev_statdata));
2131 memset (&w->attr, 0, sizeof (ev_statdata));
2132
2133 ev_stat_stat (EV_A_ w);
2134
2135 if (w->interval < MIN_STAT_INTERVAL)
2136 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2137
2138 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2139 ev_set_priority (&w->timer, ev_priority (w));
2140
2141 #if EV_USE_INOTIFY
2142 infy_init (EV_A);
2143
2144 if (fs_fd >= 0)
2145 infy_add (EV_A_ w);
2146 else
2147 #endif
2148 ev_timer_start (EV_A_ &w->timer);
2149
2150 ev_start (EV_A_ (W)w, 1);
2151 }
2152
2153 void
2154 ev_stat_stop (EV_P_ ev_stat *w)
2155 {
2156 clear_pending (EV_A_ (W)w);
2157 if (expect_false (!ev_is_active (w)))
2158 return;
2159
2160 #if EV_USE_INOTIFY
2161 infy_del (EV_A_ w);
2162 #endif
2163 ev_timer_stop (EV_A_ &w->timer);
2164
2165 ev_stop (EV_A_ (W)w);
2166 }
2167 #endif
2168
2169 #if EV_IDLE_ENABLE
2170 void
2171 ev_idle_start (EV_P_ ev_idle *w)
2172 {
2173 if (expect_false (ev_is_active (w)))
2174 return;
2175
2176 pri_adjust (EV_A_ (W)w);
2177
2178 {
2179 int active = ++idlecnt [ABSPRI (w)];
2180
2181 ++idleall;
2182 ev_start (EV_A_ (W)w, active);
2183
2184 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2185 idles [ABSPRI (w)][active - 1] = w;
2186 }
2187 }
2188
2189 void
2190 ev_idle_stop (EV_P_ ev_idle *w)
2191 {
2192 clear_pending (EV_A_ (W)w);
2193 if (expect_false (!ev_is_active (w)))
2194 return;
2195
2196 {
2197 int active = ((W)w)->active;
2198
2199 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2200 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2201
2202 ev_stop (EV_A_ (W)w);
2203 --idleall;
2204 }
2205 }
2206 #endif
2207
2208 void
2209 ev_prepare_start (EV_P_ ev_prepare *w)
2210 {
2211 if (expect_false (ev_is_active (w)))
2212 return;
2213
2214 ev_start (EV_A_ (W)w, ++preparecnt);
2215 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2216 prepares [preparecnt - 1] = w;
2217 }
2218
2219 void
2220 ev_prepare_stop (EV_P_ ev_prepare *w)
2221 {
2222 clear_pending (EV_A_ (W)w);
2223 if (expect_false (!ev_is_active (w)))
2224 return;
2225
2226 {
2227 int active = ((W)w)->active;
2228 prepares [active - 1] = prepares [--preparecnt];
2229 ((W)prepares [active - 1])->active = active;
2230 }
2231
2232 ev_stop (EV_A_ (W)w);
2233 }
2234
2235 void
2236 ev_check_start (EV_P_ ev_check *w)
2237 {
2238 if (expect_false (ev_is_active (w)))
2239 return;
2240
2241 ev_start (EV_A_ (W)w, ++checkcnt);
2242 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2243 checks [checkcnt - 1] = w;
2244 }
2245
2246 void
2247 ev_check_stop (EV_P_ ev_check *w)
2248 {
2249 clear_pending (EV_A_ (W)w);
2250 if (expect_false (!ev_is_active (w)))
2251 return;
2252
2253 {
2254 int active = ((W)w)->active;
2255 checks [active - 1] = checks [--checkcnt];
2256 ((W)checks [active - 1])->active = active;
2257 }
2258
2259 ev_stop (EV_A_ (W)w);
2260 }
2261
2262 #if EV_EMBED_ENABLE
2263 void noinline
2264 ev_embed_sweep (EV_P_ ev_embed *w)
2265 {
2266 ev_loop (w->other, EVLOOP_NONBLOCK);
2267 }
2268
2269 static void
2270 embed_io_cb (EV_P_ ev_io *io, int revents)
2271 {
2272 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2273
2274 if (ev_cb (w))
2275 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2276 else
2277 ev_loop (w->other, EVLOOP_NONBLOCK);
2278 }
2279
2280 static void
2281 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2282 {
2283 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2284
2285 {
2286 struct ev_loop *loop = w->other;
2287
2288 while (fdchangecnt)
2289 {
2290 fd_reify (EV_A);
2291 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2292 }
2293 }
2294 }
2295
2296 #if 0
2297 static void
2298 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2299 {
2300 ev_idle_stop (EV_A_ idle);
2301 }
2302 #endif
2303
2304 void
2305 ev_embed_start (EV_P_ ev_embed *w)
2306 {
2307 if (expect_false (ev_is_active (w)))
2308 return;
2309
2310 {
2311 struct ev_loop *loop = w->other;
2312 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2313 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2314 }
2315
2316 ev_set_priority (&w->io, ev_priority (w));
2317 ev_io_start (EV_A_ &w->io);
2318
2319 ev_prepare_init (&w->prepare, embed_prepare_cb);
2320 ev_set_priority (&w->prepare, EV_MINPRI);
2321 ev_prepare_start (EV_A_ &w->prepare);
2322
2323 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2324
2325 ev_start (EV_A_ (W)w, 1);
2326 }
2327
2328 void
2329 ev_embed_stop (EV_P_ ev_embed *w)
2330 {
2331 clear_pending (EV_A_ (W)w);
2332 if (expect_false (!ev_is_active (w)))
2333 return;
2334
2335 ev_io_stop (EV_A_ &w->io);
2336 ev_prepare_stop (EV_A_ &w->prepare);
2337
2338 ev_stop (EV_A_ (W)w);
2339 }
2340 #endif
2341
2342 #if EV_FORK_ENABLE
2343 void
2344 ev_fork_start (EV_P_ ev_fork *w)
2345 {
2346 if (expect_false (ev_is_active (w)))
2347 return;
2348
2349 ev_start (EV_A_ (W)w, ++forkcnt);
2350 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2351 forks [forkcnt - 1] = w;
2352 }
2353
2354 void
2355 ev_fork_stop (EV_P_ ev_fork *w)
2356 {
2357 clear_pending (EV_A_ (W)w);
2358 if (expect_false (!ev_is_active (w)))
2359 return;
2360
2361 {
2362 int active = ((W)w)->active;
2363 forks [active - 1] = forks [--forkcnt];
2364 ((W)forks [active - 1])->active = active;
2365 }
2366
2367 ev_stop (EV_A_ (W)w);
2368 }
2369 #endif
2370
2371 /*****************************************************************************/
2372
2373 struct ev_once
2374 {
2375 ev_io io;
2376 ev_timer to;
2377 void (*cb)(int revents, void *arg);
2378 void *arg;
2379 };
2380
2381 static void
2382 once_cb (EV_P_ struct ev_once *once, int revents)
2383 {
2384 void (*cb)(int revents, void *arg) = once->cb;
2385 void *arg = once->arg;
2386
2387 ev_io_stop (EV_A_ &once->io);
2388 ev_timer_stop (EV_A_ &once->to);
2389 ev_free (once);
2390
2391 cb (revents, arg);
2392 }
2393
2394 static void
2395 once_cb_io (EV_P_ ev_io *w, int revents)
2396 {
2397 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2398 }
2399
2400 static void
2401 once_cb_to (EV_P_ ev_timer *w, int revents)
2402 {
2403 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2404 }
2405
2406 void
2407 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2408 {
2409 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2410
2411 if (expect_false (!once))
2412 {
2413 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2414 return;
2415 }
2416
2417 once->cb = cb;
2418 once->arg = arg;
2419
2420 ev_init (&once->io, once_cb_io);
2421 if (fd >= 0)
2422 {
2423 ev_io_set (&once->io, fd, events);
2424 ev_io_start (EV_A_ &once->io);
2425 }
2426
2427 ev_init (&once->to, once_cb_to);
2428 if (timeout >= 0.)
2429 {
2430 ev_timer_set (&once->to, timeout, 0.);
2431 ev_timer_start (EV_A_ &once->to);
2432 }
2433 }
2434
2435 #if EV_MULTIPLICITY
2436 #include "ev_wrap.h"
2437 #endif
2438
2439 #ifdef __cplusplus
2440 }
2441 #endif
2442