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Revision: 1.32
Committed: Thu Nov 1 09:21:51 2007 UTC (16 years, 8 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.31: +7 -1 lines
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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 #if EV_USE_CONFIG_H
30 # include "config.h"
31 #endif
32
33 #include <math.h>
34 #include <stdlib.h>
35 #include <unistd.h>
36 #include <fcntl.h>
37 #include <signal.h>
38 #include <stddef.h>
39
40 #include <stdio.h>
41
42 #include <assert.h>
43 #include <errno.h>
44 #include <sys/types.h>
45 #include <sys/wait.h>
46 #include <sys/time.h>
47 #include <time.h>
48
49 #ifndef EV_USE_MONOTONIC
50 # ifdef CLOCK_MONOTONIC
51 # define EV_USE_MONOTONIC 1
52 # endif
53 #endif
54
55 #ifndef EV_USE_SELECT
56 # define EV_USE_SELECT 1
57 #endif
58
59 #ifndef EV_USE_EPOLL
60 # define EV_USE_EPOLL 0
61 #endif
62
63 #ifndef CLOCK_REALTIME
64 # define EV_USE_REALTIME 0
65 #endif
66 #ifndef EV_USE_REALTIME
67 # define EV_USE_REALTIME 1 /* posix requirement, but might be slower */
68 #endif
69
70 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
71 #define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detetc time jumps) */
72 #define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
73 #define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
74
75 #include "ev.h"
76
77 typedef struct ev_watcher *W;
78 typedef struct ev_watcher_list *WL;
79 typedef struct ev_watcher_time *WT;
80
81 static ev_tstamp now, diff; /* monotonic clock */
82 ev_tstamp ev_now;
83 int ev_method;
84
85 static int have_monotonic; /* runtime */
86
87 static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
88 static void (*method_modify)(int fd, int oev, int nev);
89 static void (*method_poll)(ev_tstamp timeout);
90
91 /*****************************************************************************/
92
93 ev_tstamp
94 ev_time (void)
95 {
96 #if EV_USE_REALTIME
97 struct timespec ts;
98 clock_gettime (CLOCK_REALTIME, &ts);
99 return ts.tv_sec + ts.tv_nsec * 1e-9;
100 #else
101 struct timeval tv;
102 gettimeofday (&tv, 0);
103 return tv.tv_sec + tv.tv_usec * 1e-6;
104 #endif
105 }
106
107 static ev_tstamp
108 get_clock (void)
109 {
110 #if EV_USE_MONOTONIC
111 if (have_monotonic)
112 {
113 struct timespec ts;
114 clock_gettime (CLOCK_MONOTONIC, &ts);
115 return ts.tv_sec + ts.tv_nsec * 1e-9;
116 }
117 #endif
118
119 return ev_time ();
120 }
121
122 #define array_roundsize(base,n) ((n) | 4 & ~3)
123
124 #define array_needsize(base,cur,cnt,init) \
125 if ((cnt) > cur) \
126 { \
127 int newcnt = cur; \
128 do \
129 { \
130 newcnt = array_roundsize (base, newcnt << 1); \
131 } \
132 while ((cnt) > newcnt); \
133 \
134 base = realloc (base, sizeof (*base) * (newcnt)); \
135 init (base + cur, newcnt - cur); \
136 cur = newcnt; \
137 }
138
139 /*****************************************************************************/
140
141 typedef struct
142 {
143 struct ev_io *head;
144 int events;
145 } ANFD;
146
147 static ANFD *anfds;
148 static int anfdmax;
149
150 static void
151 anfds_init (ANFD *base, int count)
152 {
153 while (count--)
154 {
155 base->head = 0;
156 base->events = EV_NONE;
157 ++base;
158 }
159 }
160
161 typedef struct
162 {
163 W w;
164 int events;
165 } ANPENDING;
166
167 static ANPENDING *pendings;
168 static int pendingmax, pendingcnt;
169
170 static void
171 event (W w, int events)
172 {
173 if (w->pending)
174 {
175 pendings [w->pending - 1].events |= events;
176 return;
177 }
178
179 w->pending = ++pendingcnt;
180 array_needsize (pendings, pendingmax, pendingcnt, );
181 pendings [pendingcnt - 1].w = w;
182 pendings [pendingcnt - 1].events = events;
183 }
184
185 static void
186 queue_events (W *events, int eventcnt, int type)
187 {
188 int i;
189
190 for (i = 0; i < eventcnt; ++i)
191 event (events [i], type);
192 }
193
194 static void
195 fd_event (int fd, int events)
196 {
197 ANFD *anfd = anfds + fd;
198 struct ev_io *w;
199
200 for (w = anfd->head; w; w = w->next)
201 {
202 int ev = w->events & events;
203
204 if (ev)
205 event ((W)w, ev);
206 }
207 }
208
209 /*****************************************************************************/
210
211 static int *fdchanges;
212 static int fdchangemax, fdchangecnt;
213
214 static void
215 fd_reify (void)
216 {
217 int i;
218
219 for (i = 0; i < fdchangecnt; ++i)
220 {
221 int fd = fdchanges [i];
222 ANFD *anfd = anfds + fd;
223 struct ev_io *w;
224
225 int events = 0;
226
227 for (w = anfd->head; w; w = w->next)
228 events |= w->events;
229
230 anfd->events &= ~EV_REIFY;
231
232 if (anfd->events != events)
233 {
234 method_modify (fd, anfd->events, events);
235 anfd->events = events;
236 }
237 }
238
239 fdchangecnt = 0;
240 }
241
242 static void
243 fd_change (int fd)
244 {
245 if (anfds [fd].events & EV_REIFY || fdchangecnt < 0)
246 return;
247
248 anfds [fd].events |= EV_REIFY;
249
250 ++fdchangecnt;
251 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
252 fdchanges [fdchangecnt - 1] = fd;
253 }
254
255 /* called on EBADF to verify fds */
256 static void
257 fd_recheck (void)
258 {
259 int fd;
260
261 for (fd = 0; fd < anfdmax; ++fd)
262 if (anfds [fd].events)
263 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
264 while (anfds [fd].head)
265 {
266 ev_io_stop (anfds [fd].head);
267 event ((W)anfds [fd].head, EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT);
268 }
269 }
270
271 /*****************************************************************************/
272
273 static struct ev_timer **timers;
274 static int timermax, timercnt;
275
276 static struct ev_periodic **periodics;
277 static int periodicmax, periodiccnt;
278
279 static void
280 upheap (WT *timers, int k)
281 {
282 WT w = timers [k];
283
284 while (k && timers [k >> 1]->at > w->at)
285 {
286 timers [k] = timers [k >> 1];
287 timers [k]->active = k + 1;
288 k >>= 1;
289 }
290
291 timers [k] = w;
292 timers [k]->active = k + 1;
293
294 }
295
296 static void
297 downheap (WT *timers, int N, int k)
298 {
299 WT w = timers [k];
300
301 while (k < (N >> 1))
302 {
303 int j = k << 1;
304
305 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
306 ++j;
307
308 if (w->at <= timers [j]->at)
309 break;
310
311 timers [k] = timers [j];
312 timers [k]->active = k + 1;
313 k = j;
314 }
315
316 timers [k] = w;
317 timers [k]->active = k + 1;
318 }
319
320 /*****************************************************************************/
321
322 typedef struct
323 {
324 struct ev_signal *head;
325 sig_atomic_t gotsig;
326 } ANSIG;
327
328 static ANSIG *signals;
329 static int signalmax;
330
331 static int sigpipe [2];
332 static sig_atomic_t gotsig;
333 static struct ev_io sigev;
334
335 static void
336 signals_init (ANSIG *base, int count)
337 {
338 while (count--)
339 {
340 base->head = 0;
341 base->gotsig = 0;
342 ++base;
343 }
344 }
345
346 static void
347 sighandler (int signum)
348 {
349 signals [signum - 1].gotsig = 1;
350
351 if (!gotsig)
352 {
353 gotsig = 1;
354 write (sigpipe [1], &gotsig, 1);
355 }
356 }
357
358 static void
359 sigcb (struct ev_io *iow, int revents)
360 {
361 struct ev_signal *w;
362 int sig;
363
364 gotsig = 0;
365 read (sigpipe [0], &revents, 1);
366
367 for (sig = signalmax; sig--; )
368 if (signals [sig].gotsig)
369 {
370 signals [sig].gotsig = 0;
371
372 for (w = signals [sig].head; w; w = w->next)
373 event ((W)w, EV_SIGNAL);
374 }
375 }
376
377 static void
378 siginit (void)
379 {
380 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
381 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
382
383 /* rather than sort out wether we really need nb, set it */
384 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
385 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
386
387 ev_io_set (&sigev, sigpipe [0], EV_READ);
388 ev_io_start (&sigev);
389 }
390
391 /*****************************************************************************/
392
393 static struct ev_idle **idles;
394 static int idlemax, idlecnt;
395
396 static struct ev_prepare **prepares;
397 static int preparemax, preparecnt;
398
399 static struct ev_check **checks;
400 static int checkmax, checkcnt;
401
402 /*****************************************************************************/
403
404 static struct ev_child *childs [PID_HASHSIZE];
405 static struct ev_signal childev;
406
407 #ifndef WCONTINUED
408 # define WCONTINUED 0
409 #endif
410
411 static void
412 childcb (struct ev_signal *sw, int revents)
413 {
414 struct ev_child *w;
415 int pid, status;
416
417 while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)
418 for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
419 if (w->pid == pid || w->pid == -1)
420 {
421 w->status = status;
422 event ((W)w, EV_CHILD);
423 }
424 }
425
426 /*****************************************************************************/
427
428 #if EV_USE_EPOLL
429 # include "ev_epoll.c"
430 #endif
431 #if EV_USE_SELECT
432 # include "ev_select.c"
433 #endif
434
435 int
436 ev_version_major (void)
437 {
438 return EV_VERSION_MAJOR;
439 }
440
441 int
442 ev_version_minor (void)
443 {
444 return EV_VERSION_MINOR;
445 }
446
447 int ev_init (int flags)
448 {
449 if (!ev_method)
450 {
451 #if EV_USE_MONOTONIC
452 {
453 struct timespec ts;
454 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
455 have_monotonic = 1;
456 }
457 #endif
458
459 ev_now = ev_time ();
460 now = get_clock ();
461 diff = ev_now - now;
462
463 if (pipe (sigpipe))
464 return 0;
465
466 ev_method = EVMETHOD_NONE;
467 #if EV_USE_EPOLL
468 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
469 #endif
470 #if EV_USE_SELECT
471 if (ev_method == EVMETHOD_NONE) select_init (flags);
472 #endif
473
474 if (ev_method)
475 {
476 ev_watcher_init (&sigev, sigcb);
477 siginit ();
478
479 ev_signal_init (&childev, childcb, SIGCHLD);
480 ev_signal_start (&childev);
481 }
482 }
483
484 return ev_method;
485 }
486
487 /*****************************************************************************/
488
489 void
490 ev_prefork (void)
491 {
492 /* nop */
493 }
494
495 void
496 ev_postfork_parent (void)
497 {
498 /* nop */
499 }
500
501 void
502 ev_postfork_child (void)
503 {
504 #if EV_USE_EPOLL
505 if (ev_method == EVMETHOD_EPOLL)
506 epoll_postfork_child ();
507 #endif
508
509 ev_io_stop (&sigev);
510 close (sigpipe [0]);
511 close (sigpipe [1]);
512 pipe (sigpipe);
513 siginit ();
514 }
515
516 /*****************************************************************************/
517
518 static void
519 call_pending (void)
520 {
521 while (pendingcnt)
522 {
523 ANPENDING *p = pendings + --pendingcnt;
524
525 if (p->w)
526 {
527 p->w->pending = 0;
528 p->w->cb (p->w, p->events);
529 }
530 }
531 }
532
533 static void
534 timers_reify (void)
535 {
536 while (timercnt && timers [0]->at <= now)
537 {
538 struct ev_timer *w = timers [0];
539
540 /* first reschedule or stop timer */
541 if (w->repeat)
542 {
543 w->at = now + w->repeat;
544 assert (("timer timeout in the past, negative repeat?", w->at > now));
545 downheap ((WT *)timers, timercnt, 0);
546 }
547 else
548 ev_timer_stop (w); /* nonrepeating: stop timer */
549
550 event ((W)w, EV_TIMEOUT);
551 }
552 }
553
554 static void
555 periodics_reify (void)
556 {
557 while (periodiccnt && periodics [0]->at <= ev_now)
558 {
559 struct ev_periodic *w = periodics [0];
560
561 /* first reschedule or stop timer */
562 if (w->interval)
563 {
564 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
565 assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
566 downheap ((WT *)periodics, periodiccnt, 0);
567 }
568 else
569 ev_periodic_stop (w); /* nonrepeating: stop timer */
570
571 event ((W)w, EV_TIMEOUT);
572 }
573 }
574
575 static void
576 periodics_reschedule (ev_tstamp diff)
577 {
578 int i;
579
580 /* adjust periodics after time jump */
581 for (i = 0; i < periodiccnt; ++i)
582 {
583 struct ev_periodic *w = periodics [i];
584
585 if (w->interval)
586 {
587 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
588
589 if (fabs (diff) >= 1e-4)
590 {
591 ev_periodic_stop (w);
592 ev_periodic_start (w);
593
594 i = 0; /* restart loop, inefficient, but time jumps should be rare */
595 }
596 }
597 }
598 }
599
600 static void
601 time_update (void)
602 {
603 int i;
604
605 ev_now = ev_time ();
606
607 if (have_monotonic)
608 {
609 ev_tstamp odiff = diff;
610
611 for (i = 4; --i; ) /* loop a few times, before making important decisions */
612 {
613 now = get_clock ();
614 diff = ev_now - now;
615
616 if (fabs (odiff - diff) < MIN_TIMEJUMP)
617 return; /* all is well */
618
619 ev_now = ev_time ();
620 }
621
622 periodics_reschedule (diff - odiff);
623 /* no timer adjustment, as the monotonic clock doesn't jump */
624 }
625 else
626 {
627 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
628 {
629 periodics_reschedule (ev_now - now);
630
631 /* adjust timers. this is easy, as the offset is the same for all */
632 for (i = 0; i < timercnt; ++i)
633 timers [i]->at += diff;
634 }
635
636 now = ev_now;
637 }
638 }
639
640 int ev_loop_done;
641
642 void ev_loop (int flags)
643 {
644 double block;
645 ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
646
647 do
648 {
649 /* queue check watchers (and execute them) */
650 if (preparecnt)
651 {
652 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
653 call_pending ();
654 }
655
656 /* update fd-related kernel structures */
657 fd_reify ();
658
659 /* calculate blocking time */
660
661 /* we only need this for !monotonic clockor timers, but as we basically
662 always have timers, we just calculate it always */
663 ev_now = ev_time ();
664
665 if (flags & EVLOOP_NONBLOCK || idlecnt)
666 block = 0.;
667 else
668 {
669 block = MAX_BLOCKTIME;
670
671 if (timercnt)
672 {
673 ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
674 if (block > to) block = to;
675 }
676
677 if (periodiccnt)
678 {
679 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
680 if (block > to) block = to;
681 }
682
683 if (block < 0.) block = 0.;
684 }
685
686 method_poll (block);
687
688 /* update ev_now, do magic */
689 time_update ();
690
691 /* queue pending timers and reschedule them */
692 timers_reify (); /* relative timers called last */
693 periodics_reify (); /* absolute timers called first */
694
695 /* queue idle watchers unless io or timers are pending */
696 if (!pendingcnt)
697 queue_events ((W *)idles, idlecnt, EV_IDLE);
698
699 /* queue check watchers, to be executed first */
700 if (checkcnt)
701 queue_events ((W *)checks, checkcnt, EV_CHECK);
702
703 call_pending ();
704 }
705 while (!ev_loop_done);
706
707 if (ev_loop_done != 2)
708 ev_loop_done = 0;
709 }
710
711 /*****************************************************************************/
712
713 static void
714 wlist_add (WL *head, WL elem)
715 {
716 elem->next = *head;
717 *head = elem;
718 }
719
720 static void
721 wlist_del (WL *head, WL elem)
722 {
723 while (*head)
724 {
725 if (*head == elem)
726 {
727 *head = elem->next;
728 return;
729 }
730
731 head = &(*head)->next;
732 }
733 }
734
735 static void
736 ev_clear (W w)
737 {
738 if (w->pending)
739 {
740 pendings [w->pending - 1].w = 0;
741 w->pending = 0;
742 }
743 }
744
745 static void
746 ev_start (W w, int active)
747 {
748 w->active = active;
749 }
750
751 static void
752 ev_stop (W w)
753 {
754 w->active = 0;
755 }
756
757 /*****************************************************************************/
758
759 void
760 ev_io_start (struct ev_io *w)
761 {
762 if (ev_is_active (w))
763 return;
764
765 int fd = w->fd;
766
767 ev_start ((W)w, 1);
768 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
769 wlist_add ((WL *)&anfds[fd].head, (WL)w);
770
771 fd_change (fd);
772 }
773
774 void
775 ev_io_stop (struct ev_io *w)
776 {
777 ev_clear ((W)w);
778 if (!ev_is_active (w))
779 return;
780
781 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
782 ev_stop ((W)w);
783
784 fd_change (w->fd);
785 }
786
787 void
788 ev_timer_start (struct ev_timer *w)
789 {
790 if (ev_is_active (w))
791 return;
792
793 w->at += now;
794
795 assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
796
797 ev_start ((W)w, ++timercnt);
798 array_needsize (timers, timermax, timercnt, );
799 timers [timercnt - 1] = w;
800 upheap ((WT *)timers, timercnt - 1);
801 }
802
803 void
804 ev_timer_stop (struct ev_timer *w)
805 {
806 ev_clear ((W)w);
807 if (!ev_is_active (w))
808 return;
809
810 if (w->active < timercnt--)
811 {
812 timers [w->active - 1] = timers [timercnt];
813 downheap ((WT *)timers, timercnt, w->active - 1);
814 }
815
816 w->at = w->repeat;
817
818 ev_stop ((W)w);
819 }
820
821 void
822 ev_timer_again (struct ev_timer *w)
823 {
824 if (ev_is_active (w))
825 {
826 if (w->repeat)
827 {
828 w->at = now + w->repeat;
829 downheap ((WT *)timers, timercnt, w->active - 1);
830 }
831 else
832 ev_timer_stop (w);
833 }
834 else if (w->repeat)
835 ev_timer_start (w);
836 }
837
838 void
839 ev_periodic_start (struct ev_periodic *w)
840 {
841 if (ev_is_active (w))
842 return;
843
844 assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
845
846 /* this formula differs from the one in periodic_reify because we do not always round up */
847 if (w->interval)
848 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
849
850 ev_start ((W)w, ++periodiccnt);
851 array_needsize (periodics, periodicmax, periodiccnt, );
852 periodics [periodiccnt - 1] = w;
853 upheap ((WT *)periodics, periodiccnt - 1);
854 }
855
856 void
857 ev_periodic_stop (struct ev_periodic *w)
858 {
859 ev_clear ((W)w);
860 if (!ev_is_active (w))
861 return;
862
863 if (w->active < periodiccnt--)
864 {
865 periodics [w->active - 1] = periodics [periodiccnt];
866 downheap ((WT *)periodics, periodiccnt, w->active - 1);
867 }
868
869 ev_stop ((W)w);
870 }
871
872 void
873 ev_signal_start (struct ev_signal *w)
874 {
875 if (ev_is_active (w))
876 return;
877
878 ev_start ((W)w, 1);
879 array_needsize (signals, signalmax, w->signum, signals_init);
880 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
881
882 if (!w->next)
883 {
884 struct sigaction sa;
885 sa.sa_handler = sighandler;
886 sigfillset (&sa.sa_mask);
887 sa.sa_flags = 0;
888 sigaction (w->signum, &sa, 0);
889 }
890 }
891
892 void
893 ev_signal_stop (struct ev_signal *w)
894 {
895 ev_clear ((W)w);
896 if (!ev_is_active (w))
897 return;
898
899 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
900 ev_stop ((W)w);
901
902 if (!signals [w->signum - 1].head)
903 signal (w->signum, SIG_DFL);
904 }
905
906 void
907 ev_idle_start (struct ev_idle *w)
908 {
909 if (ev_is_active (w))
910 return;
911
912 ev_start ((W)w, ++idlecnt);
913 array_needsize (idles, idlemax, idlecnt, );
914 idles [idlecnt - 1] = w;
915 }
916
917 void
918 ev_idle_stop (struct ev_idle *w)
919 {
920 ev_clear ((W)w);
921 if (ev_is_active (w))
922 return;
923
924 idles [w->active - 1] = idles [--idlecnt];
925 ev_stop ((W)w);
926 }
927
928 void
929 ev_prepare_start (struct ev_prepare *w)
930 {
931 if (ev_is_active (w))
932 return;
933
934 ev_start ((W)w, ++preparecnt);
935 array_needsize (prepares, preparemax, preparecnt, );
936 prepares [preparecnt - 1] = w;
937 }
938
939 void
940 ev_prepare_stop (struct ev_prepare *w)
941 {
942 ev_clear ((W)w);
943 if (ev_is_active (w))
944 return;
945
946 prepares [w->active - 1] = prepares [--preparecnt];
947 ev_stop ((W)w);
948 }
949
950 void
951 ev_check_start (struct ev_check *w)
952 {
953 if (ev_is_active (w))
954 return;
955
956 ev_start ((W)w, ++checkcnt);
957 array_needsize (checks, checkmax, checkcnt, );
958 checks [checkcnt - 1] = w;
959 }
960
961 void
962 ev_check_stop (struct ev_check *w)
963 {
964 ev_clear ((W)w);
965 if (ev_is_active (w))
966 return;
967
968 checks [w->active - 1] = checks [--checkcnt];
969 ev_stop ((W)w);
970 }
971
972 void
973 ev_child_start (struct ev_child *w)
974 {
975 if (ev_is_active (w))
976 return;
977
978 ev_start ((W)w, 1);
979 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
980 }
981
982 void
983 ev_child_stop (struct ev_child *w)
984 {
985 ev_clear ((W)w);
986 if (ev_is_active (w))
987 return;
988
989 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
990 ev_stop ((W)w);
991 }
992
993 /*****************************************************************************/
994
995 struct ev_once
996 {
997 struct ev_io io;
998 struct ev_timer to;
999 void (*cb)(int revents, void *arg);
1000 void *arg;
1001 };
1002
1003 static void
1004 once_cb (struct ev_once *once, int revents)
1005 {
1006 void (*cb)(int revents, void *arg) = once->cb;
1007 void *arg = once->arg;
1008
1009 ev_io_stop (&once->io);
1010 ev_timer_stop (&once->to);
1011 free (once);
1012
1013 cb (revents, arg);
1014 }
1015
1016 static void
1017 once_cb_io (struct ev_io *w, int revents)
1018 {
1019 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
1020 }
1021
1022 static void
1023 once_cb_to (struct ev_timer *w, int revents)
1024 {
1025 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
1026 }
1027
1028 void
1029 ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
1030 {
1031 struct ev_once *once = malloc (sizeof (struct ev_once));
1032
1033 if (!once)
1034 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
1035 else
1036 {
1037 once->cb = cb;
1038 once->arg = arg;
1039
1040 ev_watcher_init (&once->io, once_cb_io);
1041 if (fd >= 0)
1042 {
1043 ev_io_set (&once->io, fd, events);
1044 ev_io_start (&once->io);
1045 }
1046
1047 ev_watcher_init (&once->to, once_cb_to);
1048 if (timeout >= 0.)
1049 {
1050 ev_timer_set (&once->to, timeout, 0.);
1051 ev_timer_start (&once->to);
1052 }
1053 }
1054 }
1055
1056 /*****************************************************************************/
1057
1058 #if 0
1059
1060 struct ev_io wio;
1061
1062 static void
1063 sin_cb (struct ev_io *w, int revents)
1064 {
1065 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
1066 }
1067
1068 static void
1069 ocb (struct ev_timer *w, int revents)
1070 {
1071 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
1072 ev_timer_stop (w);
1073 ev_timer_start (w);
1074 }
1075
1076 static void
1077 scb (struct ev_signal *w, int revents)
1078 {
1079 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
1080 ev_io_stop (&wio);
1081 ev_io_start (&wio);
1082 }
1083
1084 static void
1085 gcb (struct ev_signal *w, int revents)
1086 {
1087 fprintf (stderr, "generic %x\n", revents);
1088
1089 }
1090
1091 int main (void)
1092 {
1093 ev_init (0);
1094
1095 ev_io_init (&wio, sin_cb, 0, EV_READ);
1096 ev_io_start (&wio);
1097
1098 struct ev_timer t[10000];
1099
1100 #if 0
1101 int i;
1102 for (i = 0; i < 10000; ++i)
1103 {
1104 struct ev_timer *w = t + i;
1105 ev_watcher_init (w, ocb, i);
1106 ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
1107 ev_timer_start (w);
1108 if (drand48 () < 0.5)
1109 ev_timer_stop (w);
1110 }
1111 #endif
1112
1113 struct ev_timer t1;
1114 ev_timer_init (&t1, ocb, 5, 10);
1115 ev_timer_start (&t1);
1116
1117 struct ev_signal sig;
1118 ev_signal_init (&sig, scb, SIGQUIT);
1119 ev_signal_start (&sig);
1120
1121 struct ev_check cw;
1122 ev_check_init (&cw, gcb);
1123 ev_check_start (&cw);
1124
1125 struct ev_idle iw;
1126 ev_idle_init (&iw, gcb);
1127 ev_idle_start (&iw);
1128
1129 ev_loop (0);
1130
1131 return 0;
1132 }
1133
1134 #endif
1135
1136
1137
1138