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/cvs/libev/ev.c
Revision: 1.21
Committed: Wed Oct 31 18:37:38 2007 UTC (16 years, 6 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.20: +3 -2 lines
Log Message:
add prepare watcher

File Contents

# Content
1 /*
2 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials provided
15 * with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <math.h>
31 #include <stdlib.h>
32 #include <unistd.h>
33 #include <fcntl.h>
34 #include <signal.h>
35 #include <stddef.h>
36
37 #include <stdio.h>
38
39 #include <assert.h>
40 #include <errno.h>
41 #include <sys/time.h>
42 #include <time.h>
43
44 #ifndef HAVE_MONOTONIC
45 # ifdef CLOCK_MONOTONIC
46 # define HAVE_MONOTONIC 1
47 # endif
48 #endif
49
50 #ifndef HAVE_SELECT
51 # define HAVE_SELECT 1
52 #endif
53
54 #ifndef HAVE_EPOLL
55 # define HAVE_EPOLL 0
56 #endif
57
58 #ifndef HAVE_REALTIME
59 # define HAVE_REALTIME 1 /* posix requirement, but might be slower */
60 #endif
61
62 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
63 #define MAX_BLOCKTIME 60.
64
65 #include "ev.h"
66
67 typedef struct ev_watcher *W;
68 typedef struct ev_watcher_list *WL;
69 typedef struct ev_watcher_time *WT;
70
71 static ev_tstamp now, diff; /* monotonic clock */
72 ev_tstamp ev_now;
73 int ev_method;
74
75 static int have_monotonic; /* runtime */
76
77 static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
78 static void (*method_modify)(int fd, int oev, int nev);
79 static void (*method_poll)(ev_tstamp timeout);
80
81 /*****************************************************************************/
82
83 ev_tstamp
84 ev_time (void)
85 {
86 #if HAVE_REALTIME
87 struct timespec ts;
88 clock_gettime (CLOCK_REALTIME, &ts);
89 return ts.tv_sec + ts.tv_nsec * 1e-9;
90 #else
91 struct timeval tv;
92 gettimeofday (&tv, 0);
93 return tv.tv_sec + tv.tv_usec * 1e-6;
94 #endif
95 }
96
97 static ev_tstamp
98 get_clock (void)
99 {
100 #if HAVE_MONOTONIC
101 if (have_monotonic)
102 {
103 struct timespec ts;
104 clock_gettime (CLOCK_MONOTONIC, &ts);
105 return ts.tv_sec + ts.tv_nsec * 1e-9;
106 }
107 #endif
108
109 return ev_time ();
110 }
111
112 #define array_needsize(base,cur,cnt,init) \
113 if ((cnt) > cur) \
114 { \
115 int newcnt = cur ? cur << 1 : 16; \
116 base = realloc (base, sizeof (*base) * (newcnt)); \
117 init (base + cur, newcnt - cur); \
118 cur = newcnt; \
119 }
120
121 /*****************************************************************************/
122
123 typedef struct
124 {
125 struct ev_io *head;
126 unsigned char wev, rev; /* want, received event set */
127 } ANFD;
128
129 static ANFD *anfds;
130 static int anfdmax;
131
132 static int *fdchanges;
133 static int fdchangemax, fdchangecnt;
134
135 static void
136 anfds_init (ANFD *base, int count)
137 {
138 while (count--)
139 {
140 base->head = 0;
141 base->wev = base->rev = EV_NONE;
142 ++base;
143 }
144 }
145
146 typedef struct
147 {
148 W w;
149 int events;
150 } ANPENDING;
151
152 static ANPENDING *pendings;
153 static int pendingmax, pendingcnt;
154
155 static void
156 event (W w, int events)
157 {
158 if (w->active)
159 {
160 w->pending = ++pendingcnt;
161 array_needsize (pendings, pendingmax, pendingcnt, );
162 pendings [pendingcnt - 1].w = w;
163 pendings [pendingcnt - 1].events = events;
164 }
165 }
166
167 static void
168 fd_event (int fd, int events)
169 {
170 ANFD *anfd = anfds + fd;
171 struct ev_io *w;
172
173 for (w = anfd->head; w; w = w->next)
174 {
175 int ev = w->events & events;
176
177 if (ev)
178 event ((W)w, ev);
179 }
180 }
181
182 static void
183 queue_events (W *events, int eventcnt, int type)
184 {
185 int i;
186
187 for (i = 0; i < eventcnt; ++i)
188 event (events [i], type);
189 }
190
191 /* called on EBADF to verify fds */
192 static void
193 fd_recheck ()
194 {
195 int fd;
196
197 for (fd = 0; fd < anfdmax; ++fd)
198 if (anfds [fd].wev)
199 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
200 while (anfds [fd].head)
201 evio_stop (anfds [fd].head);
202 }
203
204 /*****************************************************************************/
205
206 static struct ev_timer **timers;
207 static int timermax, timercnt;
208
209 static struct ev_periodic **periodics;
210 static int periodicmax, periodiccnt;
211
212 static void
213 upheap (WT *timers, int k)
214 {
215 WT w = timers [k];
216
217 while (k && timers [k >> 1]->at > w->at)
218 {
219 timers [k] = timers [k >> 1];
220 timers [k]->active = k + 1;
221 k >>= 1;
222 }
223
224 timers [k] = w;
225 timers [k]->active = k + 1;
226
227 }
228
229 static void
230 downheap (WT *timers, int N, int k)
231 {
232 WT w = timers [k];
233
234 while (k < (N >> 1))
235 {
236 int j = k << 1;
237
238 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
239 ++j;
240
241 if (w->at <= timers [j]->at)
242 break;
243
244 timers [k] = timers [j];
245 timers [k]->active = k + 1;
246 k = j;
247 }
248
249 timers [k] = w;
250 timers [k]->active = k + 1;
251 }
252
253 /*****************************************************************************/
254
255 typedef struct
256 {
257 struct ev_signal *head;
258 sig_atomic_t gotsig;
259 } ANSIG;
260
261 static ANSIG *signals;
262 static int signalmax;
263
264 static int sigpipe [2];
265 static sig_atomic_t gotsig;
266 static struct ev_io sigev;
267
268 static void
269 signals_init (ANSIG *base, int count)
270 {
271 while (count--)
272 {
273 base->head = 0;
274 base->gotsig = 0;
275 ++base;
276 }
277 }
278
279 static void
280 sighandler (int signum)
281 {
282 signals [signum - 1].gotsig = 1;
283
284 if (!gotsig)
285 {
286 gotsig = 1;
287 write (sigpipe [1], &gotsig, 1);
288 }
289 }
290
291 static void
292 sigcb (struct ev_io *iow, int revents)
293 {
294 struct ev_signal *w;
295 int sig;
296
297 gotsig = 0;
298 read (sigpipe [0], &revents, 1);
299
300 for (sig = signalmax; sig--; )
301 if (signals [sig].gotsig)
302 {
303 signals [sig].gotsig = 0;
304
305 for (w = signals [sig].head; w; w = w->next)
306 event ((W)w, EV_SIGNAL);
307 }
308 }
309
310 static void
311 siginit (void)
312 {
313 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
314 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
315
316 /* rather than sort out wether we really need nb, set it */
317 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
318 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
319
320 evio_set (&sigev, sigpipe [0], EV_READ);
321 evio_start (&sigev);
322 }
323
324 /*****************************************************************************/
325
326 static struct ev_idle **idles;
327 static int idlemax, idlecnt;
328
329 static struct ev_prepare **prepares;
330 static int preparemax, preparecnt;
331
332 static struct ev_check **checks;
333 static int checkmax, checkcnt;
334
335 /*****************************************************************************/
336
337 #if HAVE_EPOLL
338 # include "ev_epoll.c"
339 #endif
340 #if HAVE_SELECT
341 # include "ev_select.c"
342 #endif
343
344 int ev_init (int flags)
345 {
346 #if HAVE_MONOTONIC
347 {
348 struct timespec ts;
349 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
350 have_monotonic = 1;
351 }
352 #endif
353
354 ev_now = ev_time ();
355 now = get_clock ();
356 diff = ev_now - now;
357
358 if (pipe (sigpipe))
359 return 0;
360
361 ev_method = EVMETHOD_NONE;
362 #if HAVE_EPOLL
363 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
364 #endif
365 #if HAVE_SELECT
366 if (ev_method == EVMETHOD_NONE) select_init (flags);
367 #endif
368
369 if (ev_method)
370 {
371 evw_init (&sigev, sigcb);
372 siginit ();
373 }
374
375 return ev_method;
376 }
377
378 /*****************************************************************************/
379
380 void ev_prefork (void)
381 {
382 /* nop */
383 }
384
385 void ev_postfork_parent (void)
386 {
387 /* nop */
388 }
389
390 void ev_postfork_child (void)
391 {
392 #if HAVE_EPOLL
393 if (ev_method == EVMETHOD_EPOLL)
394 epoll_postfork_child ();
395 #endif
396
397 evio_stop (&sigev);
398 close (sigpipe [0]);
399 close (sigpipe [1]);
400 pipe (sigpipe);
401 siginit ();
402 }
403
404 /*****************************************************************************/
405
406 static void
407 fd_reify (void)
408 {
409 int i;
410
411 for (i = 0; i < fdchangecnt; ++i)
412 {
413 int fd = fdchanges [i];
414 ANFD *anfd = anfds + fd;
415 struct ev_io *w;
416
417 int wev = 0;
418
419 for (w = anfd->head; w; w = w->next)
420 wev |= w->events;
421
422 if (anfd->wev != wev)
423 {
424 method_modify (fd, anfd->wev, wev);
425 anfd->wev = wev;
426 }
427 }
428
429 fdchangecnt = 0;
430 }
431
432 static void
433 call_pending ()
434 {
435 while (pendingcnt)
436 {
437 ANPENDING *p = pendings + --pendingcnt;
438
439 if (p->w)
440 {
441 p->w->pending = 0;
442 p->w->cb (p->w, p->events);
443 }
444 }
445 }
446
447 static void
448 timers_reify ()
449 {
450 while (timercnt && timers [0]->at <= now)
451 {
452 struct ev_timer *w = timers [0];
453
454 event ((W)w, EV_TIMEOUT);
455
456 /* first reschedule or stop timer */
457 if (w->repeat)
458 {
459 w->at = now + w->repeat;
460 assert (("timer timeout in the past, negative repeat?", w->at > now));
461 downheap ((WT *)timers, timercnt, 0);
462 }
463 else
464 evtimer_stop (w); /* nonrepeating: stop timer */
465 }
466 }
467
468 static void
469 periodics_reify ()
470 {
471 while (periodiccnt && periodics [0]->at <= ev_now)
472 {
473 struct ev_periodic *w = periodics [0];
474
475 /* first reschedule or stop timer */
476 if (w->interval)
477 {
478 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
479 assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
480 downheap ((WT *)periodics, periodiccnt, 0);
481 }
482 else
483 evperiodic_stop (w); /* nonrepeating: stop timer */
484
485 event ((W)w, EV_TIMEOUT);
486 }
487 }
488
489 static void
490 periodics_reschedule (ev_tstamp diff)
491 {
492 int i;
493
494 /* adjust periodics after time jump */
495 for (i = 0; i < periodiccnt; ++i)
496 {
497 struct ev_periodic *w = periodics [i];
498
499 if (w->interval)
500 {
501 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
502
503 if (fabs (diff) >= 1e-4)
504 {
505 evperiodic_stop (w);
506 evperiodic_start (w);
507
508 i = 0; /* restart loop, inefficient, but time jumps should be rare */
509 }
510 }
511 }
512 }
513
514 static void
515 time_update ()
516 {
517 int i;
518
519 ev_now = ev_time ();
520
521 if (have_monotonic)
522 {
523 ev_tstamp odiff = diff;
524
525 for (i = 4; --i; ) /* loop a few times, before making important decisions */
526 {
527 now = get_clock ();
528 diff = ev_now - now;
529
530 if (fabs (odiff - diff) < MIN_TIMEJUMP)
531 return; /* all is well */
532
533 ev_now = ev_time ();
534 }
535
536 periodics_reschedule (diff - odiff);
537 /* no timer adjustment, as the monotonic clock doesn't jump */
538 }
539 else
540 {
541 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
542 {
543 periodics_reschedule (ev_now - now);
544
545 /* adjust timers. this is easy, as the offset is the same for all */
546 for (i = 0; i < timercnt; ++i)
547 timers [i]->at += diff;
548 }
549
550 now = ev_now;
551 }
552 }
553
554 int ev_loop_done;
555
556 void ev_loop (int flags)
557 {
558 double block;
559 ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;
560
561 do
562 {
563 /* queue check watchers (and execute them) */
564 if (preparecnt)
565 {
566 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
567 call_pending ();
568 }
569
570 /* update fd-related kernel structures */
571 fd_reify ();
572
573 /* calculate blocking time */
574
575 /* we only need this for !monotonic clockor timers, but as we basically
576 always have timers, we just calculate it always */
577 ev_now = ev_time ();
578
579 if (flags & EVLOOP_NONBLOCK || idlecnt)
580 block = 0.;
581 else
582 {
583 block = MAX_BLOCKTIME;
584
585 if (timercnt)
586 {
587 ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
588 if (block > to) block = to;
589 }
590
591 if (periodiccnt)
592 {
593 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
594 if (block > to) block = to;
595 }
596
597 if (block < 0.) block = 0.;
598 }
599
600 method_poll (block);
601
602 /* update ev_now, do magic */
603 time_update ();
604
605 /* queue pending timers and reschedule them */
606 timers_reify (); /* relative timers called last */
607 periodics_reify (); /* absolute timers called first */
608
609 /* queue idle watchers unless io or timers are pending */
610 if (!pendingcnt)
611 queue_events ((W *)idles, idlecnt, EV_IDLE);
612
613 /* queue check watchers, to be executed first */
614 if (checkcnt)
615 queue_events ((W *)checks, checkcnt, EV_CHECK);
616
617 call_pending ();
618 }
619 while (!ev_loop_done);
620
621 if (ev_loop_done != 2)
622 ev_loop_done = 0;
623 }
624
625 /*****************************************************************************/
626
627 static void
628 wlist_add (WL *head, WL elem)
629 {
630 elem->next = *head;
631 *head = elem;
632 }
633
634 static void
635 wlist_del (WL *head, WL elem)
636 {
637 while (*head)
638 {
639 if (*head == elem)
640 {
641 *head = elem->next;
642 return;
643 }
644
645 head = &(*head)->next;
646 }
647 }
648
649 static void
650 ev_clear (W w)
651 {
652 if (w->pending)
653 {
654 pendings [w->pending - 1].w = 0;
655 w->pending = 0;
656 }
657 }
658
659 static void
660 ev_start (W w, int active)
661 {
662 w->active = active;
663 }
664
665 static void
666 ev_stop (W w)
667 {
668 w->active = 0;
669 }
670
671 /*****************************************************************************/
672
673 void
674 evio_start (struct ev_io *w)
675 {
676 if (ev_is_active (w))
677 return;
678
679 int fd = w->fd;
680
681 ev_start ((W)w, 1);
682 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
683 wlist_add ((WL *)&anfds[fd].head, (WL)w);
684
685 ++fdchangecnt;
686 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
687 fdchanges [fdchangecnt - 1] = fd;
688 }
689
690 void
691 evio_stop (struct ev_io *w)
692 {
693 ev_clear ((W)w);
694 if (!ev_is_active (w))
695 return;
696
697 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
698 ev_stop ((W)w);
699
700 ++fdchangecnt;
701 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
702 fdchanges [fdchangecnt - 1] = w->fd;
703 }
704
705 void
706 evtimer_start (struct ev_timer *w)
707 {
708 if (ev_is_active (w))
709 return;
710
711 w->at += now;
712
713 assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
714
715 ev_start ((W)w, ++timercnt);
716 array_needsize (timers, timermax, timercnt, );
717 timers [timercnt - 1] = w;
718 upheap ((WT *)timers, timercnt - 1);
719 }
720
721 void
722 evtimer_stop (struct ev_timer *w)
723 {
724 ev_clear ((W)w);
725 if (!ev_is_active (w))
726 return;
727
728 if (w->active < timercnt--)
729 {
730 timers [w->active - 1] = timers [timercnt];
731 downheap ((WT *)timers, timercnt, w->active - 1);
732 }
733
734 w->at = w->repeat;
735
736 ev_stop ((W)w);
737 }
738
739 void
740 evtimer_again (struct ev_timer *w)
741 {
742 if (ev_is_active (w))
743 {
744 if (w->repeat)
745 {
746 w->at = now + w->repeat;
747 downheap ((WT *)timers, timercnt, w->active - 1);
748 }
749 else
750 evtimer_stop (w);
751 }
752 else if (w->repeat)
753 evtimer_start (w);
754 }
755
756 void
757 evperiodic_start (struct ev_periodic *w)
758 {
759 if (ev_is_active (w))
760 return;
761
762 assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
763
764 /* this formula differs from the one in periodic_reify because we do not always round up */
765 if (w->interval)
766 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
767
768 ev_start ((W)w, ++periodiccnt);
769 array_needsize (periodics, periodicmax, periodiccnt, );
770 periodics [periodiccnt - 1] = w;
771 upheap ((WT *)periodics, periodiccnt - 1);
772 }
773
774 void
775 evperiodic_stop (struct ev_periodic *w)
776 {
777 ev_clear ((W)w);
778 if (!ev_is_active (w))
779 return;
780
781 if (w->active < periodiccnt--)
782 {
783 periodics [w->active - 1] = periodics [periodiccnt];
784 downheap ((WT *)periodics, periodiccnt, w->active - 1);
785 }
786
787 ev_stop ((W)w);
788 }
789
790 void
791 evsignal_start (struct ev_signal *w)
792 {
793 if (ev_is_active (w))
794 return;
795
796 ev_start ((W)w, 1);
797 array_needsize (signals, signalmax, w->signum, signals_init);
798 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
799
800 if (!w->next)
801 {
802 struct sigaction sa;
803 sa.sa_handler = sighandler;
804 sigfillset (&sa.sa_mask);
805 sa.sa_flags = 0;
806 sigaction (w->signum, &sa, 0);
807 }
808 }
809
810 void
811 evsignal_stop (struct ev_signal *w)
812 {
813 ev_clear ((W)w);
814 if (!ev_is_active (w))
815 return;
816
817 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
818 ev_stop ((W)w);
819
820 if (!signals [w->signum - 1].head)
821 signal (w->signum, SIG_DFL);
822 }
823
824 void evidle_start (struct ev_idle *w)
825 {
826 if (ev_is_active (w))
827 return;
828
829 ev_start ((W)w, ++idlecnt);
830 array_needsize (idles, idlemax, idlecnt, );
831 idles [idlecnt - 1] = w;
832 }
833
834 void evidle_stop (struct ev_idle *w)
835 {
836 ev_clear ((W)w);
837 if (ev_is_active (w))
838 return;
839
840 idles [w->active - 1] = idles [--idlecnt];
841 ev_stop ((W)w);
842 }
843
844 void evprepare_start (struct ev_prepare *w)
845 {
846 if (ev_is_active (w))
847 return;
848
849 ev_start ((W)w, ++preparecnt);
850 array_needsize (prepares, preparemax, preparecnt, );
851 prepares [preparecnt - 1] = w;
852 }
853
854 void evprepare_stop (struct ev_prepare *w)
855 {
856 ev_clear ((W)w);
857 if (ev_is_active (w))
858 return;
859
860 prepares [w->active - 1] = prepares [--preparecnt];
861 ev_stop ((W)w);
862 }
863
864 void evcheck_start (struct ev_check *w)
865 {
866 if (ev_is_active (w))
867 return;
868
869 ev_start ((W)w, ++checkcnt);
870 array_needsize (checks, checkmax, checkcnt, );
871 checks [checkcnt - 1] = w;
872 }
873
874 void evcheck_stop (struct ev_check *w)
875 {
876 ev_clear ((W)w);
877 if (ev_is_active (w))
878 return;
879
880 checks [w->active - 1] = checks [--checkcnt];
881 ev_stop ((W)w);
882 }
883
884 /*****************************************************************************/
885
886 struct ev_once
887 {
888 struct ev_io io;
889 struct ev_timer to;
890 void (*cb)(int revents, void *arg);
891 void *arg;
892 };
893
894 static void
895 once_cb (struct ev_once *once, int revents)
896 {
897 void (*cb)(int revents, void *arg) = once->cb;
898 void *arg = once->arg;
899
900 evio_stop (&once->io);
901 evtimer_stop (&once->to);
902 free (once);
903
904 cb (revents, arg);
905 }
906
907 static void
908 once_cb_io (struct ev_io *w, int revents)
909 {
910 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
911 }
912
913 static void
914 once_cb_to (struct ev_timer *w, int revents)
915 {
916 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
917 }
918
919 void
920 ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
921 {
922 struct ev_once *once = malloc (sizeof (struct ev_once));
923
924 if (!once)
925 cb (EV_ERROR, arg);
926 else
927 {
928 once->cb = cb;
929 once->arg = arg;
930
931 evw_init (&once->io, once_cb_io);
932
933 if (fd >= 0)
934 {
935 evio_set (&once->io, fd, events);
936 evio_start (&once->io);
937 }
938
939 evw_init (&once->to, once_cb_to);
940
941 if (timeout >= 0.)
942 {
943 evtimer_set (&once->to, timeout, 0.);
944 evtimer_start (&once->to);
945 }
946 }
947 }
948
949 /*****************************************************************************/
950
951 #if 0
952
953 struct ev_io wio;
954
955 static void
956 sin_cb (struct ev_io *w, int revents)
957 {
958 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
959 }
960
961 static void
962 ocb (struct ev_timer *w, int revents)
963 {
964 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
965 evtimer_stop (w);
966 evtimer_start (w);
967 }
968
969 static void
970 scb (struct ev_signal *w, int revents)
971 {
972 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
973 evio_stop (&wio);
974 evio_start (&wio);
975 }
976
977 static void
978 gcb (struct ev_signal *w, int revents)
979 {
980 fprintf (stderr, "generic %x\n", revents);
981
982 }
983
984 int main (void)
985 {
986 ev_init (0);
987
988 evio_init (&wio, sin_cb, 0, EV_READ);
989 evio_start (&wio);
990
991 struct ev_timer t[10000];
992
993 #if 0
994 int i;
995 for (i = 0; i < 10000; ++i)
996 {
997 struct ev_timer *w = t + i;
998 evw_init (w, ocb, i);
999 evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
1000 evtimer_start (w);
1001 if (drand48 () < 0.5)
1002 evtimer_stop (w);
1003 }
1004 #endif
1005
1006 struct ev_timer t1;
1007 evtimer_init (&t1, ocb, 5, 10);
1008 evtimer_start (&t1);
1009
1010 struct ev_signal sig;
1011 evsignal_init (&sig, scb, SIGQUIT);
1012 evsignal_start (&sig);
1013
1014 struct ev_check cw;
1015 evcheck_init (&cw, gcb);
1016 evcheck_start (&cw);
1017
1018 struct ev_idle iw;
1019 evidle_init (&iw, gcb);
1020 evidle_start (&iw);
1021
1022 ev_loop (0);
1023
1024 return 0;
1025 }
1026
1027 #endif
1028
1029
1030
1031