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Revision: 1.132
Committed: Fri Nov 23 10:36:30 2007 UTC (16 years, 8 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.131: +2 -1 lines
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# 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 # include "config.h"
38
39 # if HAVE_CLOCK_GETTIME
40 # ifndef EV_USE_MONOTONIC
41 # define EV_USE_MONOTONIC 1
42 # endif
43 # ifndef EV_USE_REALTIME
44 # define EV_USE_REALTIME 1
45 # endif
46 # else
47 # ifndef EV_USE_MONOTONIC
48 # define EV_USE_MONOTONIC 0
49 # endif
50 # ifndef EV_USE_REALTIME
51 # define EV_USE_REALTIME 0
52 # endif
53 # endif
54
55 # ifndef EV_USE_SELECT
56 # if HAVE_SELECT && HAVE_SYS_SELECT_H
57 # define EV_USE_SELECT 1
58 # else
59 # define EV_USE_SELECT 0
60 # endif
61 # endif
62
63 # ifndef EV_USE_POLL
64 # if HAVE_POLL && HAVE_POLL_H
65 # define EV_USE_POLL 1
66 # else
67 # define EV_USE_POLL 0
68 # endif
69 # endif
70
71 # ifndef EV_USE_EPOLL
72 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
73 # define EV_USE_EPOLL 1
74 # else
75 # define EV_USE_EPOLL 0
76 # endif
77 # endif
78
79 # ifndef EV_USE_KQUEUE
80 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
81 # define EV_USE_KQUEUE 1
82 # else
83 # define EV_USE_KQUEUE 0
84 # endif
85 # endif
86
87 # ifndef EV_USE_PORT
88 # if HAVE_PORT_H && HAVE_PORT_CREATE
89 # define EV_USE_PORT 1
90 # else
91 # define EV_USE_PORT 0
92 # endif
93 # endif
94
95 #endif
96
97 #include <math.h>
98 #include <stdlib.h>
99 #include <fcntl.h>
100 #include <stddef.h>
101
102 #include <stdio.h>
103
104 #include <assert.h>
105 #include <errno.h>
106 #include <sys/types.h>
107 #include <time.h>
108
109 #include <signal.h>
110
111 #ifndef _WIN32
112 # include <unistd.h>
113 # include <sys/time.h>
114 # include <sys/wait.h>
115 #else
116 # define WIN32_LEAN_AND_MEAN
117 # include <windows.h>
118 # ifndef EV_SELECT_IS_WINSOCKET
119 # define EV_SELECT_IS_WINSOCKET 1
120 # endif
121 #endif
122
123 /**/
124
125 #ifndef EV_USE_MONOTONIC
126 # define EV_USE_MONOTONIC 0
127 #endif
128
129 #ifndef EV_USE_REALTIME
130 # define EV_USE_REALTIME 0
131 #endif
132
133 #ifndef EV_USE_SELECT
134 # define EV_USE_SELECT 1
135 #endif
136
137 #ifndef EV_USE_POLL
138 # ifdef _WIN32
139 # define EV_USE_POLL 0
140 # else
141 # define EV_USE_POLL 1
142 # endif
143 #endif
144
145 #ifndef EV_USE_EPOLL
146 # define EV_USE_EPOLL 0
147 #endif
148
149 #ifndef EV_USE_KQUEUE
150 # define EV_USE_KQUEUE 0
151 #endif
152
153 #ifndef EV_USE_PORT
154 # define EV_USE_PORT 0
155 #endif
156
157 /**/
158
159 #ifndef CLOCK_MONOTONIC
160 # undef EV_USE_MONOTONIC
161 # define EV_USE_MONOTONIC 0
162 #endif
163
164 #ifndef CLOCK_REALTIME
165 # undef EV_USE_REALTIME
166 # define EV_USE_REALTIME 0
167 #endif
168
169 #if EV_SELECT_IS_WINSOCKET
170 # include <winsock.h>
171 #endif
172
173 /**/
174
175 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
176 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
177 #define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
178 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
179
180 #ifdef EV_H
181 # include EV_H
182 #else
183 # include "ev.h"
184 #endif
185
186 #if __GNUC__ >= 3
187 # define expect(expr,value) __builtin_expect ((expr),(value))
188 # define inline static inline
189 #else
190 # define expect(expr,value) (expr)
191 # define inline static
192 #endif
193
194 #define expect_false(expr) expect ((expr) != 0, 0)
195 #define expect_true(expr) expect ((expr) != 0, 1)
196
197 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
198 #define ABSPRI(w) ((w)->priority - EV_MINPRI)
199
200 #define EMPTY0 /* required for microsofts broken pseudo-c compiler */
201 #define EMPTY2(a,b) /* used to suppress some warnings */
202
203 typedef struct ev_watcher *W;
204 typedef struct ev_watcher_list *WL;
205 typedef struct ev_watcher_time *WT;
206
207 static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
208
209 #ifdef _WIN32
210 # include "ev_win32.c"
211 #endif
212
213 /*****************************************************************************/
214
215 static void (*syserr_cb)(const char *msg);
216
217 void ev_set_syserr_cb (void (*cb)(const char *msg))
218 {
219 syserr_cb = cb;
220 }
221
222 static void
223 syserr (const char *msg)
224 {
225 if (!msg)
226 msg = "(libev) system error";
227
228 if (syserr_cb)
229 syserr_cb (msg);
230 else
231 {
232 perror (msg);
233 abort ();
234 }
235 }
236
237 static void *(*alloc)(void *ptr, long size);
238
239 void ev_set_allocator (void *(*cb)(void *ptr, long size))
240 {
241 alloc = cb;
242 }
243
244 static void *
245 ev_realloc (void *ptr, long size)
246 {
247 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
248
249 if (!ptr && size)
250 {
251 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
252 abort ();
253 }
254
255 return ptr;
256 }
257
258 #define ev_malloc(size) ev_realloc (0, (size))
259 #define ev_free(ptr) ev_realloc ((ptr), 0)
260
261 /*****************************************************************************/
262
263 typedef struct
264 {
265 WL head;
266 unsigned char events;
267 unsigned char reify;
268 #if EV_SELECT_IS_WINSOCKET
269 SOCKET handle;
270 #endif
271 } ANFD;
272
273 typedef struct
274 {
275 W w;
276 int events;
277 } ANPENDING;
278
279 #if EV_MULTIPLICITY
280
281 struct ev_loop
282 {
283 ev_tstamp ev_rt_now;
284 #define ev_rt_now ((loop)->ev_rt_now)
285 #define VAR(name,decl) decl;
286 #include "ev_vars.h"
287 #undef VAR
288 };
289 #include "ev_wrap.h"
290
291 static struct ev_loop default_loop_struct;
292 struct ev_loop *ev_default_loop_ptr;
293
294 #else
295
296 ev_tstamp ev_rt_now;
297 #define VAR(name,decl) static decl;
298 #include "ev_vars.h"
299 #undef VAR
300
301 static int ev_default_loop_ptr;
302
303 #endif
304
305 /*****************************************************************************/
306
307 ev_tstamp
308 ev_time (void)
309 {
310 #if EV_USE_REALTIME
311 struct timespec ts;
312 clock_gettime (CLOCK_REALTIME, &ts);
313 return ts.tv_sec + ts.tv_nsec * 1e-9;
314 #else
315 struct timeval tv;
316 gettimeofday (&tv, 0);
317 return tv.tv_sec + tv.tv_usec * 1e-6;
318 #endif
319 }
320
321 inline ev_tstamp
322 get_clock (void)
323 {
324 #if EV_USE_MONOTONIC
325 if (expect_true (have_monotonic))
326 {
327 struct timespec ts;
328 clock_gettime (CLOCK_MONOTONIC, &ts);
329 return ts.tv_sec + ts.tv_nsec * 1e-9;
330 }
331 #endif
332
333 return ev_time ();
334 }
335
336 #if EV_MULTIPLICITY
337 ev_tstamp
338 ev_now (EV_P)
339 {
340 return ev_rt_now;
341 }
342 #endif
343
344 #define array_roundsize(type,n) (((n) | 4) & ~3)
345
346 #define array_needsize(type,base,cur,cnt,init) \
347 if (expect_false ((cnt) > cur)) \
348 { \
349 int newcnt = cur; \
350 do \
351 { \
352 newcnt = array_roundsize (type, newcnt << 1); \
353 } \
354 while ((cnt) > newcnt); \
355 \
356 base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
357 init (base + cur, newcnt - cur); \
358 cur = newcnt; \
359 }
360
361 #define array_slim(type,stem) \
362 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
363 { \
364 stem ## max = array_roundsize (stem ## cnt >> 1); \
365 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
366 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
367 }
368
369 #define array_free(stem, idx) \
370 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
371
372 /*****************************************************************************/
373
374 static void
375 anfds_init (ANFD *base, int count)
376 {
377 while (count--)
378 {
379 base->head = 0;
380 base->events = EV_NONE;
381 base->reify = 0;
382
383 ++base;
384 }
385 }
386
387 void
388 ev_feed_event (EV_P_ void *w, int revents)
389 {
390 W w_ = (W)w;
391
392 if (expect_false (w_->pending))
393 {
394 pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
395 return;
396 }
397
398 w_->pending = ++pendingcnt [ABSPRI (w_)];
399 array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
400 pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
401 pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
402 }
403
404 static void
405 queue_events (EV_P_ W *events, int eventcnt, int type)
406 {
407 int i;
408
409 for (i = 0; i < eventcnt; ++i)
410 ev_feed_event (EV_A_ events [i], type);
411 }
412
413 inline void
414 fd_event (EV_P_ int fd, int revents)
415 {
416 ANFD *anfd = anfds + fd;
417 struct ev_io *w;
418
419 for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
420 {
421 int ev = w->events & revents;
422
423 if (ev)
424 ev_feed_event (EV_A_ (W)w, ev);
425 }
426 }
427
428 void
429 ev_feed_fd_event (EV_P_ int fd, int revents)
430 {
431 fd_event (EV_A_ fd, revents);
432 }
433
434 /*****************************************************************************/
435
436 inline void
437 fd_reify (EV_P)
438 {
439 int i;
440
441 for (i = 0; i < fdchangecnt; ++i)
442 {
443 int fd = fdchanges [i];
444 ANFD *anfd = anfds + fd;
445 struct ev_io *w;
446
447 int events = 0;
448
449 for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
450 events |= w->events;
451
452 #if EV_SELECT_IS_WINSOCKET
453 if (events)
454 {
455 unsigned long argp;
456 anfd->handle = _get_osfhandle (fd);
457 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
458 }
459 #endif
460
461 anfd->reify = 0;
462
463 backend_modify (EV_A_ fd, anfd->events, events);
464 anfd->events = events;
465 }
466
467 fdchangecnt = 0;
468 }
469
470 static void
471 fd_change (EV_P_ int fd)
472 {
473 if (expect_false (anfds [fd].reify))
474 return;
475
476 anfds [fd].reify = 1;
477
478 ++fdchangecnt;
479 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
480 fdchanges [fdchangecnt - 1] = fd;
481 }
482
483 static void
484 fd_kill (EV_P_ int fd)
485 {
486 struct ev_io *w;
487
488 while ((w = (struct ev_io *)anfds [fd].head))
489 {
490 ev_io_stop (EV_A_ w);
491 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
492 }
493 }
494
495 inline int
496 fd_valid (int fd)
497 {
498 #ifdef _WIN32
499 return _get_osfhandle (fd) != -1;
500 #else
501 return fcntl (fd, F_GETFD) != -1;
502 #endif
503 }
504
505 /* called on EBADF to verify fds */
506 static void
507 fd_ebadf (EV_P)
508 {
509 int fd;
510
511 for (fd = 0; fd < anfdmax; ++fd)
512 if (anfds [fd].events)
513 if (!fd_valid (fd) == -1 && errno == EBADF)
514 fd_kill (EV_A_ fd);
515 }
516
517 /* called on ENOMEM in select/poll to kill some fds and retry */
518 static void
519 fd_enomem (EV_P)
520 {
521 int fd;
522
523 for (fd = anfdmax; fd--; )
524 if (anfds [fd].events)
525 {
526 fd_kill (EV_A_ fd);
527 return;
528 }
529 }
530
531 /* usually called after fork if backend needs to re-arm all fds from scratch */
532 static void
533 fd_rearm_all (EV_P)
534 {
535 int fd;
536
537 /* this should be highly optimised to not do anything but set a flag */
538 for (fd = 0; fd < anfdmax; ++fd)
539 if (anfds [fd].events)
540 {
541 anfds [fd].events = 0;
542 fd_change (EV_A_ fd);
543 }
544 }
545
546 /*****************************************************************************/
547
548 static void
549 upheap (WT *heap, int k)
550 {
551 WT w = heap [k];
552
553 while (k && heap [k >> 1]->at > w->at)
554 {
555 heap [k] = heap [k >> 1];
556 ((W)heap [k])->active = k + 1;
557 k >>= 1;
558 }
559
560 heap [k] = w;
561 ((W)heap [k])->active = k + 1;
562
563 }
564
565 static void
566 downheap (WT *heap, int N, int k)
567 {
568 WT w = heap [k];
569
570 while (k < (N >> 1))
571 {
572 int j = k << 1;
573
574 if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
575 ++j;
576
577 if (w->at <= heap [j]->at)
578 break;
579
580 heap [k] = heap [j];
581 ((W)heap [k])->active = k + 1;
582 k = j;
583 }
584
585 heap [k] = w;
586 ((W)heap [k])->active = k + 1;
587 }
588
589 inline void
590 adjustheap (WT *heap, int N, int k)
591 {
592 upheap (heap, k);
593 downheap (heap, N, k);
594 }
595
596 /*****************************************************************************/
597
598 typedef struct
599 {
600 WL head;
601 sig_atomic_t volatile gotsig;
602 } ANSIG;
603
604 static ANSIG *signals;
605 static int signalmax;
606
607 static int sigpipe [2];
608 static sig_atomic_t volatile gotsig;
609 static struct ev_io sigev;
610
611 static void
612 signals_init (ANSIG *base, int count)
613 {
614 while (count--)
615 {
616 base->head = 0;
617 base->gotsig = 0;
618
619 ++base;
620 }
621 }
622
623 static void
624 sighandler (int signum)
625 {
626 #if _WIN32
627 signal (signum, sighandler);
628 #endif
629
630 signals [signum - 1].gotsig = 1;
631
632 if (!gotsig)
633 {
634 int old_errno = errno;
635 gotsig = 1;
636 write (sigpipe [1], &signum, 1);
637 errno = old_errno;
638 }
639 }
640
641 void
642 ev_feed_signal_event (EV_P_ int signum)
643 {
644 WL w;
645
646 #if EV_MULTIPLICITY
647 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
648 #endif
649
650 --signum;
651
652 if (signum < 0 || signum >= signalmax)
653 return;
654
655 signals [signum].gotsig = 0;
656
657 for (w = signals [signum].head; w; w = w->next)
658 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
659 }
660
661 static void
662 sigcb (EV_P_ struct ev_io *iow, int revents)
663 {
664 int signum;
665
666 read (sigpipe [0], &revents, 1);
667 gotsig = 0;
668
669 for (signum = signalmax; signum--; )
670 if (signals [signum].gotsig)
671 ev_feed_signal_event (EV_A_ signum + 1);
672 }
673
674 static void
675 fd_intern (int fd)
676 {
677 #ifdef _WIN32
678 int arg = 1;
679 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
680 #else
681 fcntl (fd, F_SETFD, FD_CLOEXEC);
682 fcntl (fd, F_SETFL, O_NONBLOCK);
683 #endif
684 }
685
686 static void
687 siginit (EV_P)
688 {
689 fd_intern (sigpipe [0]);
690 fd_intern (sigpipe [1]);
691
692 ev_io_set (&sigev, sigpipe [0], EV_READ);
693 ev_io_start (EV_A_ &sigev);
694 ev_unref (EV_A); /* child watcher should not keep loop alive */
695 }
696
697 /*****************************************************************************/
698
699 static struct ev_child *childs [PID_HASHSIZE];
700
701 #ifndef _WIN32
702
703 static struct ev_signal childev;
704
705 #ifndef WCONTINUED
706 # define WCONTINUED 0
707 #endif
708
709 static void
710 child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
711 {
712 struct ev_child *w;
713
714 for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
715 if (w->pid == pid || !w->pid)
716 {
717 ev_priority (w) = ev_priority (sw); /* need to do it *now* */
718 w->rpid = pid;
719 w->rstatus = status;
720 ev_feed_event (EV_A_ (W)w, EV_CHILD);
721 }
722 }
723
724 static void
725 childcb (EV_P_ struct ev_signal *sw, int revents)
726 {
727 int pid, status;
728
729 if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
730 {
731 /* make sure we are called again until all childs have been reaped */
732 /* we need to do it this way so that the callback gets called before we continue */
733 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
734
735 child_reap (EV_A_ sw, pid, pid, status);
736 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
737 }
738 }
739
740 #endif
741
742 /*****************************************************************************/
743
744 #if EV_USE_PORT
745 # include "ev_port.c"
746 #endif
747 #if EV_USE_KQUEUE
748 # include "ev_kqueue.c"
749 #endif
750 #if EV_USE_EPOLL
751 # include "ev_epoll.c"
752 #endif
753 #if EV_USE_POLL
754 # include "ev_poll.c"
755 #endif
756 #if EV_USE_SELECT
757 # include "ev_select.c"
758 #endif
759
760 int
761 ev_version_major (void)
762 {
763 return EV_VERSION_MAJOR;
764 }
765
766 int
767 ev_version_minor (void)
768 {
769 return EV_VERSION_MINOR;
770 }
771
772 /* return true if we are running with elevated privileges and should ignore env variables */
773 static int
774 enable_secure (void)
775 {
776 #ifdef _WIN32
777 return 0;
778 #else
779 return getuid () != geteuid ()
780 || getgid () != getegid ();
781 #endif
782 }
783
784 unsigned int
785 ev_supported_backends (void)
786 {
787 unsigned int flags = 0;
788
789 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
790 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
791 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
792 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
793 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
794
795 return flags;
796 }
797
798 unsigned int
799 ev_recommended_backends (void)
800 {
801 unsigned int flags = ev_supported_backends ();
802
803 #ifndef __NetBSD__
804 /* kqueue is borked on everything but netbsd apparently */
805 /* it usually doesn't work correctly on anything but sockets and pipes */
806 flags &= ~EVBACKEND_KQUEUE;
807 #endif
808 #ifdef __APPLE__
809 // flags &= ~EVBACKEND_KQUEUE; for documentation
810 flags &= ~EVBACKEND_POLL;
811 #endif
812
813 return flags;
814 }
815
816 unsigned int
817 ev_backend (EV_P)
818 {
819 return backend;
820 }
821
822 static void
823 loop_init (EV_P_ unsigned int flags)
824 {
825 if (!backend)
826 {
827 #if EV_USE_MONOTONIC
828 {
829 struct timespec ts;
830 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
831 have_monotonic = 1;
832 }
833 #endif
834
835 ev_rt_now = ev_time ();
836 mn_now = get_clock ();
837 now_floor = mn_now;
838 rtmn_diff = ev_rt_now - mn_now;
839
840 if (!(flags & EVFLAG_NOENV)
841 && !enable_secure ()
842 && getenv ("LIBEV_FLAGS"))
843 flags = atoi (getenv ("LIBEV_FLAGS"));
844
845 if (!(flags & 0x0000ffffUL))
846 flags |= ev_recommended_backends ();
847
848 backend = 0;
849 #if EV_USE_PORT
850 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
851 #endif
852 #if EV_USE_KQUEUE
853 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
854 #endif
855 #if EV_USE_EPOLL
856 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
857 #endif
858 #if EV_USE_POLL
859 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
860 #endif
861 #if EV_USE_SELECT
862 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
863 #endif
864
865 ev_init (&sigev, sigcb);
866 ev_set_priority (&sigev, EV_MAXPRI);
867 }
868 }
869
870 static void
871 loop_destroy (EV_P)
872 {
873 int i;
874
875 #if EV_USE_PORT
876 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
877 #endif
878 #if EV_USE_KQUEUE
879 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
880 #endif
881 #if EV_USE_EPOLL
882 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
883 #endif
884 #if EV_USE_POLL
885 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
886 #endif
887 #if EV_USE_SELECT
888 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
889 #endif
890
891 for (i = NUMPRI; i--; )
892 array_free (pending, [i]);
893
894 /* have to use the microsoft-never-gets-it-right macro */
895 array_free (fdchange, EMPTY0);
896 array_free (timer, EMPTY0);
897 #if EV_PERIODICS
898 array_free (periodic, EMPTY0);
899 #endif
900 array_free (idle, EMPTY0);
901 array_free (prepare, EMPTY0);
902 array_free (check, EMPTY0);
903
904 backend = 0;
905 }
906
907 static void
908 loop_fork (EV_P)
909 {
910 #if EV_USE_PORT
911 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
912 #endif
913 #if EV_USE_KQUEUE
914 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
915 #endif
916 #if EV_USE_EPOLL
917 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
918 #endif
919
920 if (ev_is_active (&sigev))
921 {
922 /* default loop */
923
924 ev_ref (EV_A);
925 ev_io_stop (EV_A_ &sigev);
926 close (sigpipe [0]);
927 close (sigpipe [1]);
928
929 while (pipe (sigpipe))
930 syserr ("(libev) error creating pipe");
931
932 siginit (EV_A);
933 }
934
935 postfork = 0;
936 }
937
938 #if EV_MULTIPLICITY
939 struct ev_loop *
940 ev_loop_new (unsigned int flags)
941 {
942 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
943
944 memset (loop, 0, sizeof (struct ev_loop));
945
946 loop_init (EV_A_ flags);
947
948 if (ev_backend (EV_A))
949 return loop;
950
951 return 0;
952 }
953
954 void
955 ev_loop_destroy (EV_P)
956 {
957 loop_destroy (EV_A);
958 ev_free (loop);
959 }
960
961 void
962 ev_loop_fork (EV_P)
963 {
964 postfork = 1;
965 }
966
967 #endif
968
969 #if EV_MULTIPLICITY
970 struct ev_loop *
971 ev_default_loop_init (unsigned int flags)
972 #else
973 int
974 ev_default_loop (unsigned int flags)
975 #endif
976 {
977 if (sigpipe [0] == sigpipe [1])
978 if (pipe (sigpipe))
979 return 0;
980
981 if (!ev_default_loop_ptr)
982 {
983 #if EV_MULTIPLICITY
984 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
985 #else
986 ev_default_loop_ptr = 1;
987 #endif
988
989 loop_init (EV_A_ flags);
990
991 if (ev_backend (EV_A))
992 {
993 siginit (EV_A);
994
995 #ifndef _WIN32
996 ev_signal_init (&childev, childcb, SIGCHLD);
997 ev_set_priority (&childev, EV_MAXPRI);
998 ev_signal_start (EV_A_ &childev);
999 ev_unref (EV_A); /* child watcher should not keep loop alive */
1000 #endif
1001 }
1002 else
1003 ev_default_loop_ptr = 0;
1004 }
1005
1006 return ev_default_loop_ptr;
1007 }
1008
1009 void
1010 ev_default_destroy (void)
1011 {
1012 #if EV_MULTIPLICITY
1013 struct ev_loop *loop = ev_default_loop_ptr;
1014 #endif
1015
1016 #ifndef _WIN32
1017 ev_ref (EV_A); /* child watcher */
1018 ev_signal_stop (EV_A_ &childev);
1019 #endif
1020
1021 ev_ref (EV_A); /* signal watcher */
1022 ev_io_stop (EV_A_ &sigev);
1023
1024 close (sigpipe [0]); sigpipe [0] = 0;
1025 close (sigpipe [1]); sigpipe [1] = 0;
1026
1027 loop_destroy (EV_A);
1028 }
1029
1030 void
1031 ev_default_fork (void)
1032 {
1033 #if EV_MULTIPLICITY
1034 struct ev_loop *loop = ev_default_loop_ptr;
1035 #endif
1036
1037 if (backend)
1038 postfork = 1;
1039 }
1040
1041 /*****************************************************************************/
1042
1043 static int
1044 any_pending (EV_P)
1045 {
1046 int pri;
1047
1048 for (pri = NUMPRI; pri--; )
1049 if (pendingcnt [pri])
1050 return 1;
1051
1052 return 0;
1053 }
1054
1055 inline void
1056 call_pending (EV_P)
1057 {
1058 int pri;
1059
1060 for (pri = NUMPRI; pri--; )
1061 while (pendingcnt [pri])
1062 {
1063 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1064
1065 if (expect_true (p->w))
1066 {
1067 p->w->pending = 0;
1068 EV_CB_INVOKE (p->w, p->events);
1069 }
1070 }
1071 }
1072
1073 inline void
1074 timers_reify (EV_P)
1075 {
1076 while (timercnt && ((WT)timers [0])->at <= mn_now)
1077 {
1078 struct ev_timer *w = timers [0];
1079
1080 assert (("inactive timer on timer heap detected", ev_is_active (w)));
1081
1082 /* first reschedule or stop timer */
1083 if (w->repeat)
1084 {
1085 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1086
1087 ((WT)w)->at += w->repeat;
1088 if (((WT)w)->at < mn_now)
1089 ((WT)w)->at = mn_now;
1090
1091 downheap ((WT *)timers, timercnt, 0);
1092 }
1093 else
1094 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1095
1096 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1097 }
1098 }
1099
1100 #if EV_PERIODICS
1101 inline void
1102 periodics_reify (EV_P)
1103 {
1104 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1105 {
1106 struct ev_periodic *w = periodics [0];
1107
1108 assert (("inactive timer on periodic heap detected", ev_is_active (w)));
1109
1110 /* first reschedule or stop timer */
1111 if (w->reschedule_cb)
1112 {
1113 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
1114 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1115 downheap ((WT *)periodics, periodiccnt, 0);
1116 }
1117 else if (w->interval)
1118 {
1119 ((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
1120 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1121 downheap ((WT *)periodics, periodiccnt, 0);
1122 }
1123 else
1124 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1125
1126 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1127 }
1128 }
1129
1130 static void
1131 periodics_reschedule (EV_P)
1132 {
1133 int i;
1134
1135 /* adjust periodics after time jump */
1136 for (i = 0; i < periodiccnt; ++i)
1137 {
1138 struct ev_periodic *w = periodics [i];
1139
1140 if (w->reschedule_cb)
1141 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1142 else if (w->interval)
1143 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1144 }
1145
1146 /* now rebuild the heap */
1147 for (i = periodiccnt >> 1; i--; )
1148 downheap ((WT *)periodics, periodiccnt, i);
1149 }
1150 #endif
1151
1152 inline int
1153 time_update_monotonic (EV_P)
1154 {
1155 mn_now = get_clock ();
1156
1157 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1158 {
1159 ev_rt_now = rtmn_diff + mn_now;
1160 return 0;
1161 }
1162 else
1163 {
1164 now_floor = mn_now;
1165 ev_rt_now = ev_time ();
1166 return 1;
1167 }
1168 }
1169
1170 inline void
1171 time_update (EV_P)
1172 {
1173 int i;
1174
1175 #if EV_USE_MONOTONIC
1176 if (expect_true (have_monotonic))
1177 {
1178 if (time_update_monotonic (EV_A))
1179 {
1180 ev_tstamp odiff = rtmn_diff;
1181
1182 for (i = 4; --i; ) /* loop a few times, before making important decisions */
1183 {
1184 rtmn_diff = ev_rt_now - mn_now;
1185
1186 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1187 return; /* all is well */
1188
1189 ev_rt_now = ev_time ();
1190 mn_now = get_clock ();
1191 now_floor = mn_now;
1192 }
1193
1194 # if EV_PERIODICS
1195 periodics_reschedule (EV_A);
1196 # endif
1197 /* no timer adjustment, as the monotonic clock doesn't jump */
1198 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1199 }
1200 }
1201 else
1202 #endif
1203 {
1204 ev_rt_now = ev_time ();
1205
1206 if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
1207 {
1208 #if EV_PERIODICS
1209 periodics_reschedule (EV_A);
1210 #endif
1211
1212 /* adjust timers. this is easy, as the offset is the same for all */
1213 for (i = 0; i < timercnt; ++i)
1214 ((WT)timers [i])->at += ev_rt_now - mn_now;
1215 }
1216
1217 mn_now = ev_rt_now;
1218 }
1219 }
1220
1221 void
1222 ev_ref (EV_P)
1223 {
1224 ++activecnt;
1225 }
1226
1227 void
1228 ev_unref (EV_P)
1229 {
1230 --activecnt;
1231 }
1232
1233 static int loop_done;
1234
1235 void
1236 ev_loop (EV_P_ int flags)
1237 {
1238 double block;
1239 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
1240
1241 while (activecnt)
1242 {
1243 /* queue check watchers (and execute them) */
1244 if (expect_false (preparecnt))
1245 {
1246 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1247 call_pending (EV_A);
1248 }
1249
1250 /* we might have forked, so reify kernel state if necessary */
1251 if (expect_false (postfork))
1252 loop_fork (EV_A);
1253
1254 /* update fd-related kernel structures */
1255 fd_reify (EV_A);
1256
1257 /* calculate blocking time */
1258
1259 /* we only need this for !monotonic clock or timers, but as we basically
1260 always have timers, we just calculate it always */
1261 #if EV_USE_MONOTONIC
1262 if (expect_true (have_monotonic))
1263 time_update_monotonic (EV_A);
1264 else
1265 #endif
1266 {
1267 ev_rt_now = ev_time ();
1268 mn_now = ev_rt_now;
1269 }
1270
1271 if (flags & EVLOOP_NONBLOCK || idlecnt)
1272 block = 0.;
1273 else
1274 {
1275 block = MAX_BLOCKTIME;
1276
1277 if (timercnt)
1278 {
1279 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1280 if (block > to) block = to;
1281 }
1282
1283 #if EV_PERIODICS
1284 if (periodiccnt)
1285 {
1286 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1287 if (block > to) block = to;
1288 }
1289 #endif
1290
1291 if (expect_false (block < 0.)) block = 0.;
1292 }
1293
1294 backend_poll (EV_A_ block);
1295
1296 /* update ev_rt_now, do magic */
1297 time_update (EV_A);
1298
1299 /* queue pending timers and reschedule them */
1300 timers_reify (EV_A); /* relative timers called last */
1301 #if EV_PERIODICS
1302 periodics_reify (EV_A); /* absolute timers called first */
1303 #endif
1304
1305 /* queue idle watchers unless io or timers are pending */
1306 if (idlecnt && !any_pending (EV_A))
1307 queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
1308
1309 /* queue check watchers, to be executed first */
1310 if (expect_false (checkcnt))
1311 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1312
1313 call_pending (EV_A);
1314
1315 if (expect_false (loop_done))
1316 break;
1317 }
1318
1319 if (loop_done != 2)
1320 loop_done = 0;
1321 }
1322
1323 void
1324 ev_unloop (EV_P_ int how)
1325 {
1326 loop_done = how;
1327 }
1328
1329 /*****************************************************************************/
1330
1331 inline void
1332 wlist_add (WL *head, WL elem)
1333 {
1334 elem->next = *head;
1335 *head = elem;
1336 }
1337
1338 inline void
1339 wlist_del (WL *head, WL elem)
1340 {
1341 while (*head)
1342 {
1343 if (*head == elem)
1344 {
1345 *head = elem->next;
1346 return;
1347 }
1348
1349 head = &(*head)->next;
1350 }
1351 }
1352
1353 inline void
1354 ev_clear_pending (EV_P_ W w)
1355 {
1356 if (w->pending)
1357 {
1358 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1359 w->pending = 0;
1360 }
1361 }
1362
1363 inline void
1364 ev_start (EV_P_ W w, int active)
1365 {
1366 if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
1367 if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
1368
1369 w->active = active;
1370 ev_ref (EV_A);
1371 }
1372
1373 inline void
1374 ev_stop (EV_P_ W w)
1375 {
1376 ev_unref (EV_A);
1377 w->active = 0;
1378 }
1379
1380 /*****************************************************************************/
1381
1382 void
1383 ev_io_start (EV_P_ struct ev_io *w)
1384 {
1385 int fd = w->fd;
1386
1387 if (expect_false (ev_is_active (w)))
1388 return;
1389
1390 assert (("ev_io_start called with negative fd", fd >= 0));
1391
1392 ev_start (EV_A_ (W)w, 1);
1393 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1394 wlist_add ((WL *)&anfds[fd].head, (WL)w);
1395
1396 fd_change (EV_A_ fd);
1397 }
1398
1399 void
1400 ev_io_stop (EV_P_ struct ev_io *w)
1401 {
1402 ev_clear_pending (EV_A_ (W)w);
1403 if (expect_false (!ev_is_active (w)))
1404 return;
1405
1406 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1407
1408 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
1409 ev_stop (EV_A_ (W)w);
1410
1411 fd_change (EV_A_ w->fd);
1412 }
1413
1414 void
1415 ev_timer_start (EV_P_ struct ev_timer *w)
1416 {
1417 if (expect_false (ev_is_active (w)))
1418 return;
1419
1420 ((WT)w)->at += mn_now;
1421
1422 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1423
1424 ev_start (EV_A_ (W)w, ++timercnt);
1425 array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
1426 timers [timercnt - 1] = w;
1427 upheap ((WT *)timers, timercnt - 1);
1428
1429 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1430 }
1431
1432 void
1433 ev_timer_stop (EV_P_ struct ev_timer *w)
1434 {
1435 ev_clear_pending (EV_A_ (W)w);
1436 if (expect_false (!ev_is_active (w)))
1437 return;
1438
1439 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1440
1441 if (expect_true (((W)w)->active < timercnt--))
1442 {
1443 timers [((W)w)->active - 1] = timers [timercnt];
1444 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1445 }
1446
1447 ((WT)w)->at -= mn_now;
1448
1449 ev_stop (EV_A_ (W)w);
1450 }
1451
1452 void
1453 ev_timer_again (EV_P_ struct ev_timer *w)
1454 {
1455 if (ev_is_active (w))
1456 {
1457 if (w->repeat)
1458 {
1459 ((WT)w)->at = mn_now + w->repeat;
1460 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1461 }
1462 else
1463 ev_timer_stop (EV_A_ w);
1464 }
1465 else if (w->repeat)
1466 {
1467 w->at = w->repeat;
1468 ev_timer_start (EV_A_ w);
1469 }
1470 }
1471
1472 #if EV_PERIODICS
1473 void
1474 ev_periodic_start (EV_P_ struct ev_periodic *w)
1475 {
1476 if (expect_false (ev_is_active (w)))
1477 return;
1478
1479 if (w->reschedule_cb)
1480 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1481 else if (w->interval)
1482 {
1483 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1484 /* this formula differs from the one in periodic_reify because we do not always round up */
1485 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1486 }
1487
1488 ev_start (EV_A_ (W)w, ++periodiccnt);
1489 array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
1490 periodics [periodiccnt - 1] = w;
1491 upheap ((WT *)periodics, periodiccnt - 1);
1492
1493 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1494 }
1495
1496 void
1497 ev_periodic_stop (EV_P_ struct ev_periodic *w)
1498 {
1499 ev_clear_pending (EV_A_ (W)w);
1500 if (expect_false (!ev_is_active (w)))
1501 return;
1502
1503 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1504
1505 if (expect_true (((W)w)->active < periodiccnt--))
1506 {
1507 periodics [((W)w)->active - 1] = periodics [periodiccnt];
1508 adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
1509 }
1510
1511 ev_stop (EV_A_ (W)w);
1512 }
1513
1514 void
1515 ev_periodic_again (EV_P_ struct ev_periodic *w)
1516 {
1517 /* TODO: use adjustheap and recalculation */
1518 ev_periodic_stop (EV_A_ w);
1519 ev_periodic_start (EV_A_ w);
1520 }
1521 #endif
1522
1523 void
1524 ev_idle_start (EV_P_ struct ev_idle *w)
1525 {
1526 if (expect_false (ev_is_active (w)))
1527 return;
1528
1529 ev_start (EV_A_ (W)w, ++idlecnt);
1530 array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
1531 idles [idlecnt - 1] = w;
1532 }
1533
1534 void
1535 ev_idle_stop (EV_P_ struct ev_idle *w)
1536 {
1537 ev_clear_pending (EV_A_ (W)w);
1538 if (expect_false (!ev_is_active (w)))
1539 return;
1540
1541 idles [((W)w)->active - 1] = idles [--idlecnt];
1542 ev_stop (EV_A_ (W)w);
1543 }
1544
1545 void
1546 ev_prepare_start (EV_P_ struct ev_prepare *w)
1547 {
1548 if (expect_false (ev_is_active (w)))
1549 return;
1550
1551 ev_start (EV_A_ (W)w, ++preparecnt);
1552 array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
1553 prepares [preparecnt - 1] = w;
1554 }
1555
1556 void
1557 ev_prepare_stop (EV_P_ struct ev_prepare *w)
1558 {
1559 ev_clear_pending (EV_A_ (W)w);
1560 if (expect_false (!ev_is_active (w)))
1561 return;
1562
1563 prepares [((W)w)->active - 1] = prepares [--preparecnt];
1564 ev_stop (EV_A_ (W)w);
1565 }
1566
1567 void
1568 ev_check_start (EV_P_ struct ev_check *w)
1569 {
1570 if (expect_false (ev_is_active (w)))
1571 return;
1572
1573 ev_start (EV_A_ (W)w, ++checkcnt);
1574 array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
1575 checks [checkcnt - 1] = w;
1576 }
1577
1578 void
1579 ev_check_stop (EV_P_ struct ev_check *w)
1580 {
1581 ev_clear_pending (EV_A_ (W)w);
1582 if (expect_false (!ev_is_active (w)))
1583 return;
1584
1585 checks [((W)w)->active - 1] = checks [--checkcnt];
1586 ev_stop (EV_A_ (W)w);
1587 }
1588
1589 #ifndef SA_RESTART
1590 # define SA_RESTART 0
1591 #endif
1592
1593 void
1594 ev_signal_start (EV_P_ struct ev_signal *w)
1595 {
1596 #if EV_MULTIPLICITY
1597 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1598 #endif
1599 if (expect_false (ev_is_active (w)))
1600 return;
1601
1602 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1603
1604 ev_start (EV_A_ (W)w, 1);
1605 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1606 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
1607
1608 if (!((WL)w)->next)
1609 {
1610 #if _WIN32
1611 signal (w->signum, sighandler);
1612 #else
1613 struct sigaction sa;
1614 sa.sa_handler = sighandler;
1615 sigfillset (&sa.sa_mask);
1616 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1617 sigaction (w->signum, &sa, 0);
1618 #endif
1619 }
1620 }
1621
1622 void
1623 ev_signal_stop (EV_P_ struct ev_signal *w)
1624 {
1625 ev_clear_pending (EV_A_ (W)w);
1626 if (expect_false (!ev_is_active (w)))
1627 return;
1628
1629 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1630 ev_stop (EV_A_ (W)w);
1631
1632 if (!signals [w->signum - 1].head)
1633 signal (w->signum, SIG_DFL);
1634 }
1635
1636 void
1637 ev_child_start (EV_P_ struct ev_child *w)
1638 {
1639 #if EV_MULTIPLICITY
1640 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1641 #endif
1642 if (expect_false (ev_is_active (w)))
1643 return;
1644
1645 ev_start (EV_A_ (W)w, 1);
1646 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1647 }
1648
1649 void
1650 ev_child_stop (EV_P_ struct ev_child *w)
1651 {
1652 ev_clear_pending (EV_A_ (W)w);
1653 if (expect_false (!ev_is_active (w)))
1654 return;
1655
1656 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1657 ev_stop (EV_A_ (W)w);
1658 }
1659
1660 /*****************************************************************************/
1661
1662 struct ev_once
1663 {
1664 struct ev_io io;
1665 struct ev_timer to;
1666 void (*cb)(int revents, void *arg);
1667 void *arg;
1668 };
1669
1670 static void
1671 once_cb (EV_P_ struct ev_once *once, int revents)
1672 {
1673 void (*cb)(int revents, void *arg) = once->cb;
1674 void *arg = once->arg;
1675
1676 ev_io_stop (EV_A_ &once->io);
1677 ev_timer_stop (EV_A_ &once->to);
1678 ev_free (once);
1679
1680 cb (revents, arg);
1681 }
1682
1683 static void
1684 once_cb_io (EV_P_ struct ev_io *w, int revents)
1685 {
1686 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
1687 }
1688
1689 static void
1690 once_cb_to (EV_P_ struct ev_timer *w, int revents)
1691 {
1692 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
1693 }
1694
1695 void
1696 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
1697 {
1698 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
1699
1700 if (expect_false (!once))
1701 {
1702 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
1703 return;
1704 }
1705
1706 once->cb = cb;
1707 once->arg = arg;
1708
1709 ev_init (&once->io, once_cb_io);
1710 if (fd >= 0)
1711 {
1712 ev_io_set (&once->io, fd, events);
1713 ev_io_start (EV_A_ &once->io);
1714 }
1715
1716 ev_init (&once->to, once_cb_to);
1717 if (timeout >= 0.)
1718 {
1719 ev_timer_set (&once->to, timeout, 0.);
1720 ev_timer_start (EV_A_ &once->to);
1721 }
1722 }
1723
1724 #ifdef __cplusplus
1725 }
1726 #endif
1727