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Revision: 1.23
Committed: Wed Oct 31 20:10:17 2007 UTC (16 years, 8 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.22: +29 -20 lines
Log Message:
better resize

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/types.h>
42 #include <sys/wait.h>
43 #include <sys/time.h>
44 #include <time.h>
45
46 #ifndef HAVE_MONOTONIC
47 # ifdef CLOCK_MONOTONIC
48 # define HAVE_MONOTONIC 1
49 # endif
50 #endif
51
52 #ifndef HAVE_SELECT
53 # define HAVE_SELECT 1
54 #endif
55
56 #ifndef HAVE_EPOLL
57 # define HAVE_EPOLL 0
58 #endif
59
60 #ifndef HAVE_REALTIME
61 # define HAVE_REALTIME 1 /* posix requirement, but might be slower */
62 #endif
63
64 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
65 #define MAX_BLOCKTIME 60.
66 #define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */
67
68 #include "ev.h"
69
70 typedef struct ev_watcher *W;
71 typedef struct ev_watcher_list *WL;
72 typedef struct ev_watcher_time *WT;
73
74 static ev_tstamp now, diff; /* monotonic clock */
75 ev_tstamp ev_now;
76 int ev_method;
77
78 static int have_monotonic; /* runtime */
79
80 static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
81 static void (*method_modify)(int fd, int oev, int nev);
82 static void (*method_poll)(ev_tstamp timeout);
83
84 /*****************************************************************************/
85
86 ev_tstamp
87 ev_time (void)
88 {
89 #if HAVE_REALTIME
90 struct timespec ts;
91 clock_gettime (CLOCK_REALTIME, &ts);
92 return ts.tv_sec + ts.tv_nsec * 1e-9;
93 #else
94 struct timeval tv;
95 gettimeofday (&tv, 0);
96 return tv.tv_sec + tv.tv_usec * 1e-6;
97 #endif
98 }
99
100 static ev_tstamp
101 get_clock (void)
102 {
103 #if HAVE_MONOTONIC
104 if (have_monotonic)
105 {
106 struct timespec ts;
107 clock_gettime (CLOCK_MONOTONIC, &ts);
108 return ts.tv_sec + ts.tv_nsec * 1e-9;
109 }
110 #endif
111
112 return ev_time ();
113 }
114
115 #define array_needsize(base,cur,cnt,init) \
116 if ((cnt) > cur) \
117 { \
118 int newcnt = cur; \
119 do \
120 { \
121 newcnt = (newcnt << 1) | 4 & ~3; \
122 } \
123 while ((cnt) > newcnt); \
124 \
125 base = realloc (base, sizeof (*base) * (newcnt)); \
126 init (base + cur, newcnt - cur); \
127 cur = newcnt; \
128 }
129
130 /*****************************************************************************/
131
132 typedef struct
133 {
134 struct ev_io *head;
135 unsigned char wev, rev; /* want, received event set */
136 } ANFD;
137
138 static ANFD *anfds;
139 static int anfdmax;
140
141 static int *fdchanges;
142 static int fdchangemax, fdchangecnt;
143
144 static void
145 anfds_init (ANFD *base, int count)
146 {
147 while (count--)
148 {
149 base->head = 0;
150 base->wev = base->rev = EV_NONE;
151 ++base;
152 }
153 }
154
155 typedef struct
156 {
157 W w;
158 int events;
159 } ANPENDING;
160
161 static ANPENDING *pendings;
162 static int pendingmax, pendingcnt;
163
164 static void
165 event (W w, int events)
166 {
167 if (w->active)
168 {
169 w->pending = ++pendingcnt;
170 array_needsize (pendings, pendingmax, pendingcnt, );
171 pendings [pendingcnt - 1].w = w;
172 pendings [pendingcnt - 1].events = events;
173 }
174 }
175
176 static void
177 fd_event (int fd, int events)
178 {
179 ANFD *anfd = anfds + fd;
180 struct ev_io *w;
181
182 for (w = anfd->head; w; w = w->next)
183 {
184 int ev = w->events & events;
185
186 if (ev)
187 event ((W)w, ev);
188 }
189 }
190
191 static void
192 queue_events (W *events, int eventcnt, int type)
193 {
194 int i;
195
196 for (i = 0; i < eventcnt; ++i)
197 event (events [i], type);
198 }
199
200 /* called on EBADF to verify fds */
201 static void
202 fd_recheck ()
203 {
204 int fd;
205
206 for (fd = 0; fd < anfdmax; ++fd)
207 if (anfds [fd].wev)
208 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
209 while (anfds [fd].head)
210 evio_stop (anfds [fd].head);
211 }
212
213 /*****************************************************************************/
214
215 static struct ev_timer **timers;
216 static int timermax, timercnt;
217
218 static struct ev_periodic **periodics;
219 static int periodicmax, periodiccnt;
220
221 static void
222 upheap (WT *timers, int k)
223 {
224 WT w = timers [k];
225
226 while (k && timers [k >> 1]->at > w->at)
227 {
228 timers [k] = timers [k >> 1];
229 timers [k]->active = k + 1;
230 k >>= 1;
231 }
232
233 timers [k] = w;
234 timers [k]->active = k + 1;
235
236 }
237
238 static void
239 downheap (WT *timers, int N, int k)
240 {
241 WT w = timers [k];
242
243 while (k < (N >> 1))
244 {
245 int j = k << 1;
246
247 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
248 ++j;
249
250 if (w->at <= timers [j]->at)
251 break;
252
253 timers [k] = timers [j];
254 timers [k]->active = k + 1;
255 k = j;
256 }
257
258 timers [k] = w;
259 timers [k]->active = k + 1;
260 }
261
262 /*****************************************************************************/
263
264 typedef struct
265 {
266 struct ev_signal *head;
267 sig_atomic_t gotsig;
268 } ANSIG;
269
270 static ANSIG *signals;
271 static int signalmax;
272
273 static int sigpipe [2];
274 static sig_atomic_t gotsig;
275 static struct ev_io sigev;
276
277 static void
278 signals_init (ANSIG *base, int count)
279 {
280 while (count--)
281 {
282 base->head = 0;
283 base->gotsig = 0;
284 ++base;
285 }
286 }
287
288 static void
289 sighandler (int signum)
290 {
291 signals [signum - 1].gotsig = 1;
292
293 if (!gotsig)
294 {
295 gotsig = 1;
296 write (sigpipe [1], &gotsig, 1);
297 }
298 }
299
300 static void
301 sigcb (struct ev_io *iow, int revents)
302 {
303 struct ev_signal *w;
304 int sig;
305
306 gotsig = 0;
307 read (sigpipe [0], &revents, 1);
308
309 for (sig = signalmax; sig--; )
310 if (signals [sig].gotsig)
311 {
312 signals [sig].gotsig = 0;
313
314 for (w = signals [sig].head; w; w = w->next)
315 event ((W)w, EV_SIGNAL);
316 }
317 }
318
319 static void
320 siginit (void)
321 {
322 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
323 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
324
325 /* rather than sort out wether we really need nb, set it */
326 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
327 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
328
329 evio_set (&sigev, sigpipe [0], EV_READ);
330 evio_start (&sigev);
331 }
332
333 /*****************************************************************************/
334
335 static struct ev_idle **idles;
336 static int idlemax, idlecnt;
337
338 static struct ev_prepare **prepares;
339 static int preparemax, preparecnt;
340
341 static struct ev_check **checks;
342 static int checkmax, checkcnt;
343
344 /*****************************************************************************/
345
346 static struct ev_child *childs [PID_HASHSIZE];
347 static struct ev_signal childev;
348
349 #ifndef WCONTINUED
350 # define WCONTINUED 0
351 #endif
352
353 static void
354 childcb (struct ev_signal *sw, int revents)
355 {
356 struct ev_child *w;
357 int pid, status;
358
359 while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)
360 for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
361 if (w->pid == pid || w->pid == -1)
362 {
363 w->status = status;
364 event ((W)w, EV_CHILD);
365 }
366 }
367
368 /*****************************************************************************/
369
370 #if HAVE_EPOLL
371 # include "ev_epoll.c"
372 #endif
373 #if HAVE_SELECT
374 # include "ev_select.c"
375 #endif
376
377 int ev_init (int flags)
378 {
379 if (!ev_method)
380 {
381 #if HAVE_MONOTONIC
382 {
383 struct timespec ts;
384 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
385 have_monotonic = 1;
386 }
387 #endif
388
389 ev_now = ev_time ();
390 now = get_clock ();
391 diff = ev_now - now;
392
393 if (pipe (sigpipe))
394 return 0;
395
396 ev_method = EVMETHOD_NONE;
397 #if HAVE_EPOLL
398 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
399 #endif
400 #if HAVE_SELECT
401 if (ev_method == EVMETHOD_NONE) select_init (flags);
402 #endif
403
404 if (ev_method)
405 {
406 evw_init (&sigev, sigcb);
407 siginit ();
408
409 evsignal_init (&childev, childcb, SIGCHLD);
410 evsignal_start (&childev);
411 }
412 }
413
414 return ev_method;
415 }
416
417 /*****************************************************************************/
418
419 void ev_prefork (void)
420 {
421 /* nop */
422 }
423
424 void ev_postfork_parent (void)
425 {
426 /* nop */
427 }
428
429 void ev_postfork_child (void)
430 {
431 #if HAVE_EPOLL
432 if (ev_method == EVMETHOD_EPOLL)
433 epoll_postfork_child ();
434 #endif
435
436 evio_stop (&sigev);
437 close (sigpipe [0]);
438 close (sigpipe [1]);
439 pipe (sigpipe);
440 siginit ();
441 }
442
443 /*****************************************************************************/
444
445 static void
446 fd_reify (void)
447 {
448 int i;
449
450 for (i = 0; i < fdchangecnt; ++i)
451 {
452 int fd = fdchanges [i];
453 ANFD *anfd = anfds + fd;
454 struct ev_io *w;
455
456 int wev = 0;
457
458 for (w = anfd->head; w; w = w->next)
459 wev |= w->events;
460
461 if (anfd->wev != wev)
462 {
463 method_modify (fd, anfd->wev, wev);
464 anfd->wev = wev;
465 }
466 }
467
468 fdchangecnt = 0;
469 }
470
471 static void
472 call_pending ()
473 {
474 while (pendingcnt)
475 {
476 ANPENDING *p = pendings + --pendingcnt;
477
478 if (p->w)
479 {
480 p->w->pending = 0;
481 p->w->cb (p->w, p->events);
482 }
483 }
484 }
485
486 static void
487 timers_reify ()
488 {
489 while (timercnt && timers [0]->at <= now)
490 {
491 struct ev_timer *w = timers [0];
492
493 event ((W)w, EV_TIMEOUT);
494
495 /* first reschedule or stop timer */
496 if (w->repeat)
497 {
498 w->at = now + w->repeat;
499 assert (("timer timeout in the past, negative repeat?", w->at > now));
500 downheap ((WT *)timers, timercnt, 0);
501 }
502 else
503 evtimer_stop (w); /* nonrepeating: stop timer */
504 }
505 }
506
507 static void
508 periodics_reify ()
509 {
510 while (periodiccnt && periodics [0]->at <= ev_now)
511 {
512 struct ev_periodic *w = periodics [0];
513
514 /* first reschedule or stop timer */
515 if (w->interval)
516 {
517 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
518 assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
519 downheap ((WT *)periodics, periodiccnt, 0);
520 }
521 else
522 evperiodic_stop (w); /* nonrepeating: stop timer */
523
524 event ((W)w, EV_TIMEOUT);
525 }
526 }
527
528 static void
529 periodics_reschedule (ev_tstamp diff)
530 {
531 int i;
532
533 /* adjust periodics after time jump */
534 for (i = 0; i < periodiccnt; ++i)
535 {
536 struct ev_periodic *w = periodics [i];
537
538 if (w->interval)
539 {
540 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
541
542 if (fabs (diff) >= 1e-4)
543 {
544 evperiodic_stop (w);
545 evperiodic_start (w);
546
547 i = 0; /* restart loop, inefficient, but time jumps should be rare */
548 }
549 }
550 }
551 }
552
553 static void
554 time_update ()
555 {
556 int i;
557
558 ev_now = ev_time ();
559
560 if (have_monotonic)
561 {
562 ev_tstamp odiff = diff;
563
564 for (i = 4; --i; ) /* loop a few times, before making important decisions */
565 {
566 now = get_clock ();
567 diff = ev_now - now;
568
569 if (fabs (odiff - diff) < MIN_TIMEJUMP)
570 return; /* all is well */
571
572 ev_now = ev_time ();
573 }
574
575 periodics_reschedule (diff - odiff);
576 /* no timer adjustment, as the monotonic clock doesn't jump */
577 }
578 else
579 {
580 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
581 {
582 periodics_reschedule (ev_now - now);
583
584 /* adjust timers. this is easy, as the offset is the same for all */
585 for (i = 0; i < timercnt; ++i)
586 timers [i]->at += diff;
587 }
588
589 now = ev_now;
590 }
591 }
592
593 int ev_loop_done;
594
595 void ev_loop (int flags)
596 {
597 double block;
598 ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;
599
600 do
601 {
602 /* queue check watchers (and execute them) */
603 if (preparecnt)
604 {
605 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
606 call_pending ();
607 }
608
609 /* update fd-related kernel structures */
610 fd_reify ();
611
612 /* calculate blocking time */
613
614 /* we only need this for !monotonic clockor timers, but as we basically
615 always have timers, we just calculate it always */
616 ev_now = ev_time ();
617
618 if (flags & EVLOOP_NONBLOCK || idlecnt)
619 block = 0.;
620 else
621 {
622 block = MAX_BLOCKTIME;
623
624 if (timercnt)
625 {
626 ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
627 if (block > to) block = to;
628 }
629
630 if (periodiccnt)
631 {
632 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
633 if (block > to) block = to;
634 }
635
636 if (block < 0.) block = 0.;
637 }
638
639 method_poll (block);
640
641 /* update ev_now, do magic */
642 time_update ();
643
644 /* queue pending timers and reschedule them */
645 timers_reify (); /* relative timers called last */
646 periodics_reify (); /* absolute timers called first */
647
648 /* queue idle watchers unless io or timers are pending */
649 if (!pendingcnt)
650 queue_events ((W *)idles, idlecnt, EV_IDLE);
651
652 /* queue check watchers, to be executed first */
653 if (checkcnt)
654 queue_events ((W *)checks, checkcnt, EV_CHECK);
655
656 call_pending ();
657 }
658 while (!ev_loop_done);
659
660 if (ev_loop_done != 2)
661 ev_loop_done = 0;
662 }
663
664 /*****************************************************************************/
665
666 static void
667 wlist_add (WL *head, WL elem)
668 {
669 elem->next = *head;
670 *head = elem;
671 }
672
673 static void
674 wlist_del (WL *head, WL elem)
675 {
676 while (*head)
677 {
678 if (*head == elem)
679 {
680 *head = elem->next;
681 return;
682 }
683
684 head = &(*head)->next;
685 }
686 }
687
688 static void
689 ev_clear (W w)
690 {
691 if (w->pending)
692 {
693 pendings [w->pending - 1].w = 0;
694 w->pending = 0;
695 }
696 }
697
698 static void
699 ev_start (W w, int active)
700 {
701 w->active = active;
702 }
703
704 static void
705 ev_stop (W w)
706 {
707 w->active = 0;
708 }
709
710 /*****************************************************************************/
711
712 void
713 evio_start (struct ev_io *w)
714 {
715 if (ev_is_active (w))
716 return;
717
718 int fd = w->fd;
719
720 ev_start ((W)w, 1);
721 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
722 wlist_add ((WL *)&anfds[fd].head, (WL)w);
723
724 ++fdchangecnt;
725 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
726 fdchanges [fdchangecnt - 1] = fd;
727 }
728
729 void
730 evio_stop (struct ev_io *w)
731 {
732 ev_clear ((W)w);
733 if (!ev_is_active (w))
734 return;
735
736 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
737 ev_stop ((W)w);
738
739 ++fdchangecnt;
740 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
741 fdchanges [fdchangecnt - 1] = w->fd;
742 }
743
744 void
745 evtimer_start (struct ev_timer *w)
746 {
747 if (ev_is_active (w))
748 return;
749
750 w->at += now;
751
752 assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
753
754 ev_start ((W)w, ++timercnt);
755 array_needsize (timers, timermax, timercnt, );
756 timers [timercnt - 1] = w;
757 upheap ((WT *)timers, timercnt - 1);
758 }
759
760 void
761 evtimer_stop (struct ev_timer *w)
762 {
763 ev_clear ((W)w);
764 if (!ev_is_active (w))
765 return;
766
767 if (w->active < timercnt--)
768 {
769 timers [w->active - 1] = timers [timercnt];
770 downheap ((WT *)timers, timercnt, w->active - 1);
771 }
772
773 w->at = w->repeat;
774
775 ev_stop ((W)w);
776 }
777
778 void
779 evtimer_again (struct ev_timer *w)
780 {
781 if (ev_is_active (w))
782 {
783 if (w->repeat)
784 {
785 w->at = now + w->repeat;
786 downheap ((WT *)timers, timercnt, w->active - 1);
787 }
788 else
789 evtimer_stop (w);
790 }
791 else if (w->repeat)
792 evtimer_start (w);
793 }
794
795 void
796 evperiodic_start (struct ev_periodic *w)
797 {
798 if (ev_is_active (w))
799 return;
800
801 assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
802
803 /* this formula differs from the one in periodic_reify because we do not always round up */
804 if (w->interval)
805 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
806
807 ev_start ((W)w, ++periodiccnt);
808 array_needsize (periodics, periodicmax, periodiccnt, );
809 periodics [periodiccnt - 1] = w;
810 upheap ((WT *)periodics, periodiccnt - 1);
811 }
812
813 void
814 evperiodic_stop (struct ev_periodic *w)
815 {
816 ev_clear ((W)w);
817 if (!ev_is_active (w))
818 return;
819
820 if (w->active < periodiccnt--)
821 {
822 periodics [w->active - 1] = periodics [periodiccnt];
823 downheap ((WT *)periodics, periodiccnt, w->active - 1);
824 }
825
826 ev_stop ((W)w);
827 }
828
829 void
830 evsignal_start (struct ev_signal *w)
831 {
832 if (ev_is_active (w))
833 return;
834
835 ev_start ((W)w, 1);
836 array_needsize (signals, signalmax, w->signum, signals_init);
837 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
838
839 if (!w->next)
840 {
841 struct sigaction sa;
842 sa.sa_handler = sighandler;
843 sigfillset (&sa.sa_mask);
844 sa.sa_flags = 0;
845 sigaction (w->signum, &sa, 0);
846 }
847 }
848
849 void
850 evsignal_stop (struct ev_signal *w)
851 {
852 ev_clear ((W)w);
853 if (!ev_is_active (w))
854 return;
855
856 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
857 ev_stop ((W)w);
858
859 if (!signals [w->signum - 1].head)
860 signal (w->signum, SIG_DFL);
861 }
862
863 void evidle_start (struct ev_idle *w)
864 {
865 if (ev_is_active (w))
866 return;
867
868 ev_start ((W)w, ++idlecnt);
869 array_needsize (idles, idlemax, idlecnt, );
870 idles [idlecnt - 1] = w;
871 }
872
873 void evidle_stop (struct ev_idle *w)
874 {
875 ev_clear ((W)w);
876 if (ev_is_active (w))
877 return;
878
879 idles [w->active - 1] = idles [--idlecnt];
880 ev_stop ((W)w);
881 }
882
883 void evprepare_start (struct ev_prepare *w)
884 {
885 if (ev_is_active (w))
886 return;
887
888 ev_start ((W)w, ++preparecnt);
889 array_needsize (prepares, preparemax, preparecnt, );
890 prepares [preparecnt - 1] = w;
891 }
892
893 void evprepare_stop (struct ev_prepare *w)
894 {
895 ev_clear ((W)w);
896 if (ev_is_active (w))
897 return;
898
899 prepares [w->active - 1] = prepares [--preparecnt];
900 ev_stop ((W)w);
901 }
902
903 void evcheck_start (struct ev_check *w)
904 {
905 if (ev_is_active (w))
906 return;
907
908 ev_start ((W)w, ++checkcnt);
909 array_needsize (checks, checkmax, checkcnt, );
910 checks [checkcnt - 1] = w;
911 }
912
913 void evcheck_stop (struct ev_check *w)
914 {
915 ev_clear ((W)w);
916 if (ev_is_active (w))
917 return;
918
919 checks [w->active - 1] = checks [--checkcnt];
920 ev_stop ((W)w);
921 }
922
923 void evchild_start (struct ev_child *w)
924 {
925 if (ev_is_active (w))
926 return;
927
928 ev_start ((W)w, 1);
929 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
930 }
931
932 void evchild_stop (struct ev_child *w)
933 {
934 ev_clear ((W)w);
935 if (ev_is_active (w))
936 return;
937
938 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
939 ev_stop ((W)w);
940 }
941
942 /*****************************************************************************/
943
944 struct ev_once
945 {
946 struct ev_io io;
947 struct ev_timer to;
948 void (*cb)(int revents, void *arg);
949 void *arg;
950 };
951
952 static void
953 once_cb (struct ev_once *once, int revents)
954 {
955 void (*cb)(int revents, void *arg) = once->cb;
956 void *arg = once->arg;
957
958 evio_stop (&once->io);
959 evtimer_stop (&once->to);
960 free (once);
961
962 cb (revents, arg);
963 }
964
965 static void
966 once_cb_io (struct ev_io *w, int revents)
967 {
968 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
969 }
970
971 static void
972 once_cb_to (struct ev_timer *w, int revents)
973 {
974 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
975 }
976
977 void
978 ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
979 {
980 struct ev_once *once = malloc (sizeof (struct ev_once));
981
982 if (!once)
983 cb (EV_ERROR, arg);
984 else
985 {
986 once->cb = cb;
987 once->arg = arg;
988
989 evw_init (&once->io, once_cb_io);
990
991 if (fd >= 0)
992 {
993 evio_set (&once->io, fd, events);
994 evio_start (&once->io);
995 }
996
997 evw_init (&once->to, once_cb_to);
998
999 if (timeout >= 0.)
1000 {
1001 evtimer_set (&once->to, timeout, 0.);
1002 evtimer_start (&once->to);
1003 }
1004 }
1005 }
1006
1007 /*****************************************************************************/
1008
1009 #if 0
1010
1011 struct ev_io wio;
1012
1013 static void
1014 sin_cb (struct ev_io *w, int revents)
1015 {
1016 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
1017 }
1018
1019 static void
1020 ocb (struct ev_timer *w, int revents)
1021 {
1022 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
1023 evtimer_stop (w);
1024 evtimer_start (w);
1025 }
1026
1027 static void
1028 scb (struct ev_signal *w, int revents)
1029 {
1030 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
1031 evio_stop (&wio);
1032 evio_start (&wio);
1033 }
1034
1035 static void
1036 gcb (struct ev_signal *w, int revents)
1037 {
1038 fprintf (stderr, "generic %x\n", revents);
1039
1040 }
1041
1042 int main (void)
1043 {
1044 ev_init (0);
1045
1046 evio_init (&wio, sin_cb, 0, EV_READ);
1047 evio_start (&wio);
1048
1049 struct ev_timer t[10000];
1050
1051 #if 0
1052 int i;
1053 for (i = 0; i < 10000; ++i)
1054 {
1055 struct ev_timer *w = t + i;
1056 evw_init (w, ocb, i);
1057 evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
1058 evtimer_start (w);
1059 if (drand48 () < 0.5)
1060 evtimer_stop (w);
1061 }
1062 #endif
1063
1064 struct ev_timer t1;
1065 evtimer_init (&t1, ocb, 5, 10);
1066 evtimer_start (&t1);
1067
1068 struct ev_signal sig;
1069 evsignal_init (&sig, scb, SIGQUIT);
1070 evsignal_start (&sig);
1071
1072 struct ev_check cw;
1073 evcheck_init (&cw, gcb);
1074 evcheck_start (&cw);
1075
1076 struct ev_idle iw;
1077 evidle_init (&iw, gcb);
1078 evidle_start (&iw);
1079
1080 ev_loop (0);
1081
1082 return 0;
1083 }
1084
1085 #endif
1086
1087
1088
1089