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Revision: 1.133
Committed: Fri Nov 23 11:32:22 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.132: +5 -1 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials provided
17 * with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifdef __cplusplus
33 extern "C" {
34 #endif
35
36 #ifndef EV_STANDALONE
37 # ifdef EV_CONFIG_H
38 # include EV_CONFIG_H
39 # else
40 # include "config.h"
41 # endif
42
43 # if HAVE_CLOCK_GETTIME
44 # ifndef EV_USE_MONOTONIC
45 # define EV_USE_MONOTONIC 1
46 # endif
47 # ifndef EV_USE_REALTIME
48 # define EV_USE_REALTIME 1
49 # endif
50 # else
51 # ifndef EV_USE_MONOTONIC
52 # define EV_USE_MONOTONIC 0
53 # endif
54 # ifndef EV_USE_REALTIME
55 # define EV_USE_REALTIME 0
56 # endif
57 # endif
58
59 # ifndef EV_USE_SELECT
60 # if HAVE_SELECT && HAVE_SYS_SELECT_H
61 # define EV_USE_SELECT 1
62 # else
63 # define EV_USE_SELECT 0
64 # endif
65 # endif
66
67 # ifndef EV_USE_POLL
68 # if HAVE_POLL && HAVE_POLL_H
69 # define EV_USE_POLL 1
70 # else
71 # define EV_USE_POLL 0
72 # endif
73 # endif
74
75 # ifndef EV_USE_EPOLL
76 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
77 # define EV_USE_EPOLL 1
78 # else
79 # define EV_USE_EPOLL 0
80 # endif
81 # endif
82
83 # ifndef EV_USE_KQUEUE
84 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
85 # define EV_USE_KQUEUE 1
86 # else
87 # define EV_USE_KQUEUE 0
88 # endif
89 # endif
90
91 # ifndef EV_USE_PORT
92 # if HAVE_PORT_H && HAVE_PORT_CREATE
93 # define EV_USE_PORT 1
94 # else
95 # define EV_USE_PORT 0
96 # endif
97 # endif
98
99 #endif
100
101 #include <math.h>
102 #include <stdlib.h>
103 #include <fcntl.h>
104 #include <stddef.h>
105
106 #include <stdio.h>
107
108 #include <assert.h>
109 #include <errno.h>
110 #include <sys/types.h>
111 #include <time.h>
112
113 #include <signal.h>
114
115 #ifndef _WIN32
116 # include <unistd.h>
117 # include <sys/time.h>
118 # include <sys/wait.h>
119 #else
120 # define WIN32_LEAN_AND_MEAN
121 # include <windows.h>
122 # ifndef EV_SELECT_IS_WINSOCKET
123 # define EV_SELECT_IS_WINSOCKET 1
124 # endif
125 #endif
126
127 /**/
128
129 #ifndef EV_USE_MONOTONIC
130 # define EV_USE_MONOTONIC 0
131 #endif
132
133 #ifndef EV_USE_REALTIME
134 # define EV_USE_REALTIME 0
135 #endif
136
137 #ifndef EV_USE_SELECT
138 # define EV_USE_SELECT 1
139 #endif
140
141 #ifndef EV_USE_POLL
142 # ifdef _WIN32
143 # define EV_USE_POLL 0
144 # else
145 # define EV_USE_POLL 1
146 # endif
147 #endif
148
149 #ifndef EV_USE_EPOLL
150 # define EV_USE_EPOLL 0
151 #endif
152
153 #ifndef EV_USE_KQUEUE
154 # define EV_USE_KQUEUE 0
155 #endif
156
157 #ifndef EV_USE_PORT
158 # define EV_USE_PORT 0
159 #endif
160
161 /**/
162
163 #ifndef CLOCK_MONOTONIC
164 # undef EV_USE_MONOTONIC
165 # define EV_USE_MONOTONIC 0
166 #endif
167
168 #ifndef CLOCK_REALTIME
169 # undef EV_USE_REALTIME
170 # define EV_USE_REALTIME 0
171 #endif
172
173 #if EV_SELECT_IS_WINSOCKET
174 # include <winsock.h>
175 #endif
176
177 /**/
178
179 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
180 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
181 #define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
182 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
183
184 #ifdef EV_H
185 # include EV_H
186 #else
187 # include "ev.h"
188 #endif
189
190 #if __GNUC__ >= 3
191 # define expect(expr,value) __builtin_expect ((expr),(value))
192 # define inline static inline
193 #else
194 # define expect(expr,value) (expr)
195 # define inline static
196 #endif
197
198 #define expect_false(expr) expect ((expr) != 0, 0)
199 #define expect_true(expr) expect ((expr) != 0, 1)
200
201 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
202 #define ABSPRI(w) ((w)->priority - EV_MINPRI)
203
204 #define EMPTY0 /* required for microsofts broken pseudo-c compiler */
205 #define EMPTY2(a,b) /* used to suppress some warnings */
206
207 typedef struct ev_watcher *W;
208 typedef struct ev_watcher_list *WL;
209 typedef struct ev_watcher_time *WT;
210
211 static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
212
213 #ifdef _WIN32
214 # include "ev_win32.c"
215 #endif
216
217 /*****************************************************************************/
218
219 static void (*syserr_cb)(const char *msg);
220
221 void ev_set_syserr_cb (void (*cb)(const char *msg))
222 {
223 syserr_cb = cb;
224 }
225
226 static void
227 syserr (const char *msg)
228 {
229 if (!msg)
230 msg = "(libev) system error";
231
232 if (syserr_cb)
233 syserr_cb (msg);
234 else
235 {
236 perror (msg);
237 abort ();
238 }
239 }
240
241 static void *(*alloc)(void *ptr, long size);
242
243 void ev_set_allocator (void *(*cb)(void *ptr, long size))
244 {
245 alloc = cb;
246 }
247
248 static void *
249 ev_realloc (void *ptr, long size)
250 {
251 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
252
253 if (!ptr && size)
254 {
255 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
256 abort ();
257 }
258
259 return ptr;
260 }
261
262 #define ev_malloc(size) ev_realloc (0, (size))
263 #define ev_free(ptr) ev_realloc ((ptr), 0)
264
265 /*****************************************************************************/
266
267 typedef struct
268 {
269 WL head;
270 unsigned char events;
271 unsigned char reify;
272 #if EV_SELECT_IS_WINSOCKET
273 SOCKET handle;
274 #endif
275 } ANFD;
276
277 typedef struct
278 {
279 W w;
280 int events;
281 } ANPENDING;
282
283 #if EV_MULTIPLICITY
284
285 struct ev_loop
286 {
287 ev_tstamp ev_rt_now;
288 #define ev_rt_now ((loop)->ev_rt_now)
289 #define VAR(name,decl) decl;
290 #include "ev_vars.h"
291 #undef VAR
292 };
293 #include "ev_wrap.h"
294
295 static struct ev_loop default_loop_struct;
296 struct ev_loop *ev_default_loop_ptr;
297
298 #else
299
300 ev_tstamp ev_rt_now;
301 #define VAR(name,decl) static decl;
302 #include "ev_vars.h"
303 #undef VAR
304
305 static int ev_default_loop_ptr;
306
307 #endif
308
309 /*****************************************************************************/
310
311 ev_tstamp
312 ev_time (void)
313 {
314 #if EV_USE_REALTIME
315 struct timespec ts;
316 clock_gettime (CLOCK_REALTIME, &ts);
317 return ts.tv_sec + ts.tv_nsec * 1e-9;
318 #else
319 struct timeval tv;
320 gettimeofday (&tv, 0);
321 return tv.tv_sec + tv.tv_usec * 1e-6;
322 #endif
323 }
324
325 inline ev_tstamp
326 get_clock (void)
327 {
328 #if EV_USE_MONOTONIC
329 if (expect_true (have_monotonic))
330 {
331 struct timespec ts;
332 clock_gettime (CLOCK_MONOTONIC, &ts);
333 return ts.tv_sec + ts.tv_nsec * 1e-9;
334 }
335 #endif
336
337 return ev_time ();
338 }
339
340 #if EV_MULTIPLICITY
341 ev_tstamp
342 ev_now (EV_P)
343 {
344 return ev_rt_now;
345 }
346 #endif
347
348 #define array_roundsize(type,n) (((n) | 4) & ~3)
349
350 #define array_needsize(type,base,cur,cnt,init) \
351 if (expect_false ((cnt) > cur)) \
352 { \
353 int newcnt = cur; \
354 do \
355 { \
356 newcnt = array_roundsize (type, newcnt << 1); \
357 } \
358 while ((cnt) > newcnt); \
359 \
360 base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
361 init (base + cur, newcnt - cur); \
362 cur = newcnt; \
363 }
364
365 #define array_slim(type,stem) \
366 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
367 { \
368 stem ## max = array_roundsize (stem ## cnt >> 1); \
369 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
370 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
371 }
372
373 #define array_free(stem, idx) \
374 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
375
376 /*****************************************************************************/
377
378 static void
379 anfds_init (ANFD *base, int count)
380 {
381 while (count--)
382 {
383 base->head = 0;
384 base->events = EV_NONE;
385 base->reify = 0;
386
387 ++base;
388 }
389 }
390
391 void
392 ev_feed_event (EV_P_ void *w, int revents)
393 {
394 W w_ = (W)w;
395
396 if (expect_false (w_->pending))
397 {
398 pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
399 return;
400 }
401
402 w_->pending = ++pendingcnt [ABSPRI (w_)];
403 array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
404 pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
405 pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
406 }
407
408 static void
409 queue_events (EV_P_ W *events, int eventcnt, int type)
410 {
411 int i;
412
413 for (i = 0; i < eventcnt; ++i)
414 ev_feed_event (EV_A_ events [i], type);
415 }
416
417 inline void
418 fd_event (EV_P_ int fd, int revents)
419 {
420 ANFD *anfd = anfds + fd;
421 struct ev_io *w;
422
423 for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
424 {
425 int ev = w->events & revents;
426
427 if (ev)
428 ev_feed_event (EV_A_ (W)w, ev);
429 }
430 }
431
432 void
433 ev_feed_fd_event (EV_P_ int fd, int revents)
434 {
435 fd_event (EV_A_ fd, revents);
436 }
437
438 /*****************************************************************************/
439
440 inline void
441 fd_reify (EV_P)
442 {
443 int i;
444
445 for (i = 0; i < fdchangecnt; ++i)
446 {
447 int fd = fdchanges [i];
448 ANFD *anfd = anfds + fd;
449 struct ev_io *w;
450
451 int events = 0;
452
453 for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
454 events |= w->events;
455
456 #if EV_SELECT_IS_WINSOCKET
457 if (events)
458 {
459 unsigned long argp;
460 anfd->handle = _get_osfhandle (fd);
461 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
462 }
463 #endif
464
465 anfd->reify = 0;
466
467 backend_modify (EV_A_ fd, anfd->events, events);
468 anfd->events = events;
469 }
470
471 fdchangecnt = 0;
472 }
473
474 static void
475 fd_change (EV_P_ int fd)
476 {
477 if (expect_false (anfds [fd].reify))
478 return;
479
480 anfds [fd].reify = 1;
481
482 ++fdchangecnt;
483 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
484 fdchanges [fdchangecnt - 1] = fd;
485 }
486
487 static void
488 fd_kill (EV_P_ int fd)
489 {
490 struct ev_io *w;
491
492 while ((w = (struct ev_io *)anfds [fd].head))
493 {
494 ev_io_stop (EV_A_ w);
495 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
496 }
497 }
498
499 inline int
500 fd_valid (int fd)
501 {
502 #ifdef _WIN32
503 return _get_osfhandle (fd) != -1;
504 #else
505 return fcntl (fd, F_GETFD) != -1;
506 #endif
507 }
508
509 /* called on EBADF to verify fds */
510 static void
511 fd_ebadf (EV_P)
512 {
513 int fd;
514
515 for (fd = 0; fd < anfdmax; ++fd)
516 if (anfds [fd].events)
517 if (!fd_valid (fd) == -1 && errno == EBADF)
518 fd_kill (EV_A_ fd);
519 }
520
521 /* called on ENOMEM in select/poll to kill some fds and retry */
522 static void
523 fd_enomem (EV_P)
524 {
525 int fd;
526
527 for (fd = anfdmax; fd--; )
528 if (anfds [fd].events)
529 {
530 fd_kill (EV_A_ fd);
531 return;
532 }
533 }
534
535 /* usually called after fork if backend needs to re-arm all fds from scratch */
536 static void
537 fd_rearm_all (EV_P)
538 {
539 int fd;
540
541 /* this should be highly optimised to not do anything but set a flag */
542 for (fd = 0; fd < anfdmax; ++fd)
543 if (anfds [fd].events)
544 {
545 anfds [fd].events = 0;
546 fd_change (EV_A_ fd);
547 }
548 }
549
550 /*****************************************************************************/
551
552 static void
553 upheap (WT *heap, int k)
554 {
555 WT w = heap [k];
556
557 while (k && heap [k >> 1]->at > w->at)
558 {
559 heap [k] = heap [k >> 1];
560 ((W)heap [k])->active = k + 1;
561 k >>= 1;
562 }
563
564 heap [k] = w;
565 ((W)heap [k])->active = k + 1;
566
567 }
568
569 static void
570 downheap (WT *heap, int N, int k)
571 {
572 WT w = heap [k];
573
574 while (k < (N >> 1))
575 {
576 int j = k << 1;
577
578 if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
579 ++j;
580
581 if (w->at <= heap [j]->at)
582 break;
583
584 heap [k] = heap [j];
585 ((W)heap [k])->active = k + 1;
586 k = j;
587 }
588
589 heap [k] = w;
590 ((W)heap [k])->active = k + 1;
591 }
592
593 inline void
594 adjustheap (WT *heap, int N, int k)
595 {
596 upheap (heap, k);
597 downheap (heap, N, k);
598 }
599
600 /*****************************************************************************/
601
602 typedef struct
603 {
604 WL head;
605 sig_atomic_t volatile gotsig;
606 } ANSIG;
607
608 static ANSIG *signals;
609 static int signalmax;
610
611 static int sigpipe [2];
612 static sig_atomic_t volatile gotsig;
613 static struct ev_io sigev;
614
615 static void
616 signals_init (ANSIG *base, int count)
617 {
618 while (count--)
619 {
620 base->head = 0;
621 base->gotsig = 0;
622
623 ++base;
624 }
625 }
626
627 static void
628 sighandler (int signum)
629 {
630 #if _WIN32
631 signal (signum, sighandler);
632 #endif
633
634 signals [signum - 1].gotsig = 1;
635
636 if (!gotsig)
637 {
638 int old_errno = errno;
639 gotsig = 1;
640 write (sigpipe [1], &signum, 1);
641 errno = old_errno;
642 }
643 }
644
645 void
646 ev_feed_signal_event (EV_P_ int signum)
647 {
648 WL w;
649
650 #if EV_MULTIPLICITY
651 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
652 #endif
653
654 --signum;
655
656 if (signum < 0 || signum >= signalmax)
657 return;
658
659 signals [signum].gotsig = 0;
660
661 for (w = signals [signum].head; w; w = w->next)
662 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
663 }
664
665 static void
666 sigcb (EV_P_ struct ev_io *iow, int revents)
667 {
668 int signum;
669
670 read (sigpipe [0], &revents, 1);
671 gotsig = 0;
672
673 for (signum = signalmax; signum--; )
674 if (signals [signum].gotsig)
675 ev_feed_signal_event (EV_A_ signum + 1);
676 }
677
678 static void
679 fd_intern (int fd)
680 {
681 #ifdef _WIN32
682 int arg = 1;
683 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
684 #else
685 fcntl (fd, F_SETFD, FD_CLOEXEC);
686 fcntl (fd, F_SETFL, O_NONBLOCK);
687 #endif
688 }
689
690 static void
691 siginit (EV_P)
692 {
693 fd_intern (sigpipe [0]);
694 fd_intern (sigpipe [1]);
695
696 ev_io_set (&sigev, sigpipe [0], EV_READ);
697 ev_io_start (EV_A_ &sigev);
698 ev_unref (EV_A); /* child watcher should not keep loop alive */
699 }
700
701 /*****************************************************************************/
702
703 static struct ev_child *childs [PID_HASHSIZE];
704
705 #ifndef _WIN32
706
707 static struct ev_signal childev;
708
709 #ifndef WCONTINUED
710 # define WCONTINUED 0
711 #endif
712
713 static void
714 child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
715 {
716 struct ev_child *w;
717
718 for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
719 if (w->pid == pid || !w->pid)
720 {
721 ev_priority (w) = ev_priority (sw); /* need to do it *now* */
722 w->rpid = pid;
723 w->rstatus = status;
724 ev_feed_event (EV_A_ (W)w, EV_CHILD);
725 }
726 }
727
728 static void
729 childcb (EV_P_ struct ev_signal *sw, int revents)
730 {
731 int pid, status;
732
733 if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
734 {
735 /* make sure we are called again until all childs have been reaped */
736 /* we need to do it this way so that the callback gets called before we continue */
737 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
738
739 child_reap (EV_A_ sw, pid, pid, status);
740 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
741 }
742 }
743
744 #endif
745
746 /*****************************************************************************/
747
748 #if EV_USE_PORT
749 # include "ev_port.c"
750 #endif
751 #if EV_USE_KQUEUE
752 # include "ev_kqueue.c"
753 #endif
754 #if EV_USE_EPOLL
755 # include "ev_epoll.c"
756 #endif
757 #if EV_USE_POLL
758 # include "ev_poll.c"
759 #endif
760 #if EV_USE_SELECT
761 # include "ev_select.c"
762 #endif
763
764 int
765 ev_version_major (void)
766 {
767 return EV_VERSION_MAJOR;
768 }
769
770 int
771 ev_version_minor (void)
772 {
773 return EV_VERSION_MINOR;
774 }
775
776 /* return true if we are running with elevated privileges and should ignore env variables */
777 static int
778 enable_secure (void)
779 {
780 #ifdef _WIN32
781 return 0;
782 #else
783 return getuid () != geteuid ()
784 || getgid () != getegid ();
785 #endif
786 }
787
788 unsigned int
789 ev_supported_backends (void)
790 {
791 unsigned int flags = 0;
792
793 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
794 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
795 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
796 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
797 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
798
799 return flags;
800 }
801
802 unsigned int
803 ev_recommended_backends (void)
804 {
805 unsigned int flags = ev_supported_backends ();
806
807 #ifndef __NetBSD__
808 /* kqueue is borked on everything but netbsd apparently */
809 /* it usually doesn't work correctly on anything but sockets and pipes */
810 flags &= ~EVBACKEND_KQUEUE;
811 #endif
812 #ifdef __APPLE__
813 // flags &= ~EVBACKEND_KQUEUE; for documentation
814 flags &= ~EVBACKEND_POLL;
815 #endif
816
817 return flags;
818 }
819
820 unsigned int
821 ev_backend (EV_P)
822 {
823 return backend;
824 }
825
826 static void
827 loop_init (EV_P_ unsigned int flags)
828 {
829 if (!backend)
830 {
831 #if EV_USE_MONOTONIC
832 {
833 struct timespec ts;
834 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
835 have_monotonic = 1;
836 }
837 #endif
838
839 ev_rt_now = ev_time ();
840 mn_now = get_clock ();
841 now_floor = mn_now;
842 rtmn_diff = ev_rt_now - mn_now;
843
844 if (!(flags & EVFLAG_NOENV)
845 && !enable_secure ()
846 && getenv ("LIBEV_FLAGS"))
847 flags = atoi (getenv ("LIBEV_FLAGS"));
848
849 if (!(flags & 0x0000ffffUL))
850 flags |= ev_recommended_backends ();
851
852 backend = 0;
853 #if EV_USE_PORT
854 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
855 #endif
856 #if EV_USE_KQUEUE
857 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
858 #endif
859 #if EV_USE_EPOLL
860 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
861 #endif
862 #if EV_USE_POLL
863 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
864 #endif
865 #if EV_USE_SELECT
866 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
867 #endif
868
869 ev_init (&sigev, sigcb);
870 ev_set_priority (&sigev, EV_MAXPRI);
871 }
872 }
873
874 static void
875 loop_destroy (EV_P)
876 {
877 int i;
878
879 #if EV_USE_PORT
880 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
881 #endif
882 #if EV_USE_KQUEUE
883 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
884 #endif
885 #if EV_USE_EPOLL
886 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
887 #endif
888 #if EV_USE_POLL
889 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
890 #endif
891 #if EV_USE_SELECT
892 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
893 #endif
894
895 for (i = NUMPRI; i--; )
896 array_free (pending, [i]);
897
898 /* have to use the microsoft-never-gets-it-right macro */
899 array_free (fdchange, EMPTY0);
900 array_free (timer, EMPTY0);
901 #if EV_PERIODICS
902 array_free (periodic, EMPTY0);
903 #endif
904 array_free (idle, EMPTY0);
905 array_free (prepare, EMPTY0);
906 array_free (check, EMPTY0);
907
908 backend = 0;
909 }
910
911 static void
912 loop_fork (EV_P)
913 {
914 #if EV_USE_PORT
915 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
916 #endif
917 #if EV_USE_KQUEUE
918 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
919 #endif
920 #if EV_USE_EPOLL
921 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
922 #endif
923
924 if (ev_is_active (&sigev))
925 {
926 /* default loop */
927
928 ev_ref (EV_A);
929 ev_io_stop (EV_A_ &sigev);
930 close (sigpipe [0]);
931 close (sigpipe [1]);
932
933 while (pipe (sigpipe))
934 syserr ("(libev) error creating pipe");
935
936 siginit (EV_A);
937 }
938
939 postfork = 0;
940 }
941
942 #if EV_MULTIPLICITY
943 struct ev_loop *
944 ev_loop_new (unsigned int flags)
945 {
946 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
947
948 memset (loop, 0, sizeof (struct ev_loop));
949
950 loop_init (EV_A_ flags);
951
952 if (ev_backend (EV_A))
953 return loop;
954
955 return 0;
956 }
957
958 void
959 ev_loop_destroy (EV_P)
960 {
961 loop_destroy (EV_A);
962 ev_free (loop);
963 }
964
965 void
966 ev_loop_fork (EV_P)
967 {
968 postfork = 1;
969 }
970
971 #endif
972
973 #if EV_MULTIPLICITY
974 struct ev_loop *
975 ev_default_loop_init (unsigned int flags)
976 #else
977 int
978 ev_default_loop (unsigned int flags)
979 #endif
980 {
981 if (sigpipe [0] == sigpipe [1])
982 if (pipe (sigpipe))
983 return 0;
984
985 if (!ev_default_loop_ptr)
986 {
987 #if EV_MULTIPLICITY
988 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
989 #else
990 ev_default_loop_ptr = 1;
991 #endif
992
993 loop_init (EV_A_ flags);
994
995 if (ev_backend (EV_A))
996 {
997 siginit (EV_A);
998
999 #ifndef _WIN32
1000 ev_signal_init (&childev, childcb, SIGCHLD);
1001 ev_set_priority (&childev, EV_MAXPRI);
1002 ev_signal_start (EV_A_ &childev);
1003 ev_unref (EV_A); /* child watcher should not keep loop alive */
1004 #endif
1005 }
1006 else
1007 ev_default_loop_ptr = 0;
1008 }
1009
1010 return ev_default_loop_ptr;
1011 }
1012
1013 void
1014 ev_default_destroy (void)
1015 {
1016 #if EV_MULTIPLICITY
1017 struct ev_loop *loop = ev_default_loop_ptr;
1018 #endif
1019
1020 #ifndef _WIN32
1021 ev_ref (EV_A); /* child watcher */
1022 ev_signal_stop (EV_A_ &childev);
1023 #endif
1024
1025 ev_ref (EV_A); /* signal watcher */
1026 ev_io_stop (EV_A_ &sigev);
1027
1028 close (sigpipe [0]); sigpipe [0] = 0;
1029 close (sigpipe [1]); sigpipe [1] = 0;
1030
1031 loop_destroy (EV_A);
1032 }
1033
1034 void
1035 ev_default_fork (void)
1036 {
1037 #if EV_MULTIPLICITY
1038 struct ev_loop *loop = ev_default_loop_ptr;
1039 #endif
1040
1041 if (backend)
1042 postfork = 1;
1043 }
1044
1045 /*****************************************************************************/
1046
1047 static int
1048 any_pending (EV_P)
1049 {
1050 int pri;
1051
1052 for (pri = NUMPRI; pri--; )
1053 if (pendingcnt [pri])
1054 return 1;
1055
1056 return 0;
1057 }
1058
1059 inline void
1060 call_pending (EV_P)
1061 {
1062 int pri;
1063
1064 for (pri = NUMPRI; pri--; )
1065 while (pendingcnt [pri])
1066 {
1067 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1068
1069 if (expect_true (p->w))
1070 {
1071 p->w->pending = 0;
1072 EV_CB_INVOKE (p->w, p->events);
1073 }
1074 }
1075 }
1076
1077 inline void
1078 timers_reify (EV_P)
1079 {
1080 while (timercnt && ((WT)timers [0])->at <= mn_now)
1081 {
1082 struct ev_timer *w = timers [0];
1083
1084 assert (("inactive timer on timer heap detected", ev_is_active (w)));
1085
1086 /* first reschedule or stop timer */
1087 if (w->repeat)
1088 {
1089 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1090
1091 ((WT)w)->at += w->repeat;
1092 if (((WT)w)->at < mn_now)
1093 ((WT)w)->at = mn_now;
1094
1095 downheap ((WT *)timers, timercnt, 0);
1096 }
1097 else
1098 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1099
1100 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1101 }
1102 }
1103
1104 #if EV_PERIODICS
1105 inline void
1106 periodics_reify (EV_P)
1107 {
1108 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1109 {
1110 struct ev_periodic *w = periodics [0];
1111
1112 assert (("inactive timer on periodic heap detected", ev_is_active (w)));
1113
1114 /* first reschedule or stop timer */
1115 if (w->reschedule_cb)
1116 {
1117 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
1118 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1119 downheap ((WT *)periodics, periodiccnt, 0);
1120 }
1121 else if (w->interval)
1122 {
1123 ((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
1124 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1125 downheap ((WT *)periodics, periodiccnt, 0);
1126 }
1127 else
1128 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1129
1130 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1131 }
1132 }
1133
1134 static void
1135 periodics_reschedule (EV_P)
1136 {
1137 int i;
1138
1139 /* adjust periodics after time jump */
1140 for (i = 0; i < periodiccnt; ++i)
1141 {
1142 struct ev_periodic *w = periodics [i];
1143
1144 if (w->reschedule_cb)
1145 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1146 else if (w->interval)
1147 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1148 }
1149
1150 /* now rebuild the heap */
1151 for (i = periodiccnt >> 1; i--; )
1152 downheap ((WT *)periodics, periodiccnt, i);
1153 }
1154 #endif
1155
1156 inline int
1157 time_update_monotonic (EV_P)
1158 {
1159 mn_now = get_clock ();
1160
1161 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1162 {
1163 ev_rt_now = rtmn_diff + mn_now;
1164 return 0;
1165 }
1166 else
1167 {
1168 now_floor = mn_now;
1169 ev_rt_now = ev_time ();
1170 return 1;
1171 }
1172 }
1173
1174 inline void
1175 time_update (EV_P)
1176 {
1177 int i;
1178
1179 #if EV_USE_MONOTONIC
1180 if (expect_true (have_monotonic))
1181 {
1182 if (time_update_monotonic (EV_A))
1183 {
1184 ev_tstamp odiff = rtmn_diff;
1185
1186 for (i = 4; --i; ) /* loop a few times, before making important decisions */
1187 {
1188 rtmn_diff = ev_rt_now - mn_now;
1189
1190 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1191 return; /* all is well */
1192
1193 ev_rt_now = ev_time ();
1194 mn_now = get_clock ();
1195 now_floor = mn_now;
1196 }
1197
1198 # if EV_PERIODICS
1199 periodics_reschedule (EV_A);
1200 # endif
1201 /* no timer adjustment, as the monotonic clock doesn't jump */
1202 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1203 }
1204 }
1205 else
1206 #endif
1207 {
1208 ev_rt_now = ev_time ();
1209
1210 if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
1211 {
1212 #if EV_PERIODICS
1213 periodics_reschedule (EV_A);
1214 #endif
1215
1216 /* adjust timers. this is easy, as the offset is the same for all */
1217 for (i = 0; i < timercnt; ++i)
1218 ((WT)timers [i])->at += ev_rt_now - mn_now;
1219 }
1220
1221 mn_now = ev_rt_now;
1222 }
1223 }
1224
1225 void
1226 ev_ref (EV_P)
1227 {
1228 ++activecnt;
1229 }
1230
1231 void
1232 ev_unref (EV_P)
1233 {
1234 --activecnt;
1235 }
1236
1237 static int loop_done;
1238
1239 void
1240 ev_loop (EV_P_ int flags)
1241 {
1242 double block;
1243 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
1244
1245 while (activecnt)
1246 {
1247 /* queue check watchers (and execute them) */
1248 if (expect_false (preparecnt))
1249 {
1250 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1251 call_pending (EV_A);
1252 }
1253
1254 /* we might have forked, so reify kernel state if necessary */
1255 if (expect_false (postfork))
1256 loop_fork (EV_A);
1257
1258 /* update fd-related kernel structures */
1259 fd_reify (EV_A);
1260
1261 /* calculate blocking time */
1262
1263 /* we only need this for !monotonic clock or timers, but as we basically
1264 always have timers, we just calculate it always */
1265 #if EV_USE_MONOTONIC
1266 if (expect_true (have_monotonic))
1267 time_update_monotonic (EV_A);
1268 else
1269 #endif
1270 {
1271 ev_rt_now = ev_time ();
1272 mn_now = ev_rt_now;
1273 }
1274
1275 if (flags & EVLOOP_NONBLOCK || idlecnt)
1276 block = 0.;
1277 else
1278 {
1279 block = MAX_BLOCKTIME;
1280
1281 if (timercnt)
1282 {
1283 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1284 if (block > to) block = to;
1285 }
1286
1287 #if EV_PERIODICS
1288 if (periodiccnt)
1289 {
1290 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1291 if (block > to) block = to;
1292 }
1293 #endif
1294
1295 if (expect_false (block < 0.)) block = 0.;
1296 }
1297
1298 backend_poll (EV_A_ block);
1299
1300 /* update ev_rt_now, do magic */
1301 time_update (EV_A);
1302
1303 /* queue pending timers and reschedule them */
1304 timers_reify (EV_A); /* relative timers called last */
1305 #if EV_PERIODICS
1306 periodics_reify (EV_A); /* absolute timers called first */
1307 #endif
1308
1309 /* queue idle watchers unless io or timers are pending */
1310 if (idlecnt && !any_pending (EV_A))
1311 queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
1312
1313 /* queue check watchers, to be executed first */
1314 if (expect_false (checkcnt))
1315 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1316
1317 call_pending (EV_A);
1318
1319 if (expect_false (loop_done))
1320 break;
1321 }
1322
1323 if (loop_done != 2)
1324 loop_done = 0;
1325 }
1326
1327 void
1328 ev_unloop (EV_P_ int how)
1329 {
1330 loop_done = how;
1331 }
1332
1333 /*****************************************************************************/
1334
1335 inline void
1336 wlist_add (WL *head, WL elem)
1337 {
1338 elem->next = *head;
1339 *head = elem;
1340 }
1341
1342 inline void
1343 wlist_del (WL *head, WL elem)
1344 {
1345 while (*head)
1346 {
1347 if (*head == elem)
1348 {
1349 *head = elem->next;
1350 return;
1351 }
1352
1353 head = &(*head)->next;
1354 }
1355 }
1356
1357 inline void
1358 ev_clear_pending (EV_P_ W w)
1359 {
1360 if (w->pending)
1361 {
1362 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1363 w->pending = 0;
1364 }
1365 }
1366
1367 inline void
1368 ev_start (EV_P_ W w, int active)
1369 {
1370 if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
1371 if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
1372
1373 w->active = active;
1374 ev_ref (EV_A);
1375 }
1376
1377 inline void
1378 ev_stop (EV_P_ W w)
1379 {
1380 ev_unref (EV_A);
1381 w->active = 0;
1382 }
1383
1384 /*****************************************************************************/
1385
1386 void
1387 ev_io_start (EV_P_ struct ev_io *w)
1388 {
1389 int fd = w->fd;
1390
1391 if (expect_false (ev_is_active (w)))
1392 return;
1393
1394 assert (("ev_io_start called with negative fd", fd >= 0));
1395
1396 ev_start (EV_A_ (W)w, 1);
1397 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1398 wlist_add ((WL *)&anfds[fd].head, (WL)w);
1399
1400 fd_change (EV_A_ fd);
1401 }
1402
1403 void
1404 ev_io_stop (EV_P_ struct ev_io *w)
1405 {
1406 ev_clear_pending (EV_A_ (W)w);
1407 if (expect_false (!ev_is_active (w)))
1408 return;
1409
1410 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1411
1412 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
1413 ev_stop (EV_A_ (W)w);
1414
1415 fd_change (EV_A_ w->fd);
1416 }
1417
1418 void
1419 ev_timer_start (EV_P_ struct ev_timer *w)
1420 {
1421 if (expect_false (ev_is_active (w)))
1422 return;
1423
1424 ((WT)w)->at += mn_now;
1425
1426 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1427
1428 ev_start (EV_A_ (W)w, ++timercnt);
1429 array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
1430 timers [timercnt - 1] = w;
1431 upheap ((WT *)timers, timercnt - 1);
1432
1433 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1434 }
1435
1436 void
1437 ev_timer_stop (EV_P_ struct ev_timer *w)
1438 {
1439 ev_clear_pending (EV_A_ (W)w);
1440 if (expect_false (!ev_is_active (w)))
1441 return;
1442
1443 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1444
1445 if (expect_true (((W)w)->active < timercnt--))
1446 {
1447 timers [((W)w)->active - 1] = timers [timercnt];
1448 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1449 }
1450
1451 ((WT)w)->at -= mn_now;
1452
1453 ev_stop (EV_A_ (W)w);
1454 }
1455
1456 void
1457 ev_timer_again (EV_P_ struct ev_timer *w)
1458 {
1459 if (ev_is_active (w))
1460 {
1461 if (w->repeat)
1462 {
1463 ((WT)w)->at = mn_now + w->repeat;
1464 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1465 }
1466 else
1467 ev_timer_stop (EV_A_ w);
1468 }
1469 else if (w->repeat)
1470 {
1471 w->at = w->repeat;
1472 ev_timer_start (EV_A_ w);
1473 }
1474 }
1475
1476 #if EV_PERIODICS
1477 void
1478 ev_periodic_start (EV_P_ struct ev_periodic *w)
1479 {
1480 if (expect_false (ev_is_active (w)))
1481 return;
1482
1483 if (w->reschedule_cb)
1484 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1485 else if (w->interval)
1486 {
1487 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1488 /* this formula differs from the one in periodic_reify because we do not always round up */
1489 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1490 }
1491
1492 ev_start (EV_A_ (W)w, ++periodiccnt);
1493 array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
1494 periodics [periodiccnt - 1] = w;
1495 upheap ((WT *)periodics, periodiccnt - 1);
1496
1497 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1498 }
1499
1500 void
1501 ev_periodic_stop (EV_P_ struct ev_periodic *w)
1502 {
1503 ev_clear_pending (EV_A_ (W)w);
1504 if (expect_false (!ev_is_active (w)))
1505 return;
1506
1507 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1508
1509 if (expect_true (((W)w)->active < periodiccnt--))
1510 {
1511 periodics [((W)w)->active - 1] = periodics [periodiccnt];
1512 adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
1513 }
1514
1515 ev_stop (EV_A_ (W)w);
1516 }
1517
1518 void
1519 ev_periodic_again (EV_P_ struct ev_periodic *w)
1520 {
1521 /* TODO: use adjustheap and recalculation */
1522 ev_periodic_stop (EV_A_ w);
1523 ev_periodic_start (EV_A_ w);
1524 }
1525 #endif
1526
1527 void
1528 ev_idle_start (EV_P_ struct ev_idle *w)
1529 {
1530 if (expect_false (ev_is_active (w)))
1531 return;
1532
1533 ev_start (EV_A_ (W)w, ++idlecnt);
1534 array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
1535 idles [idlecnt - 1] = w;
1536 }
1537
1538 void
1539 ev_idle_stop (EV_P_ struct ev_idle *w)
1540 {
1541 ev_clear_pending (EV_A_ (W)w);
1542 if (expect_false (!ev_is_active (w)))
1543 return;
1544
1545 idles [((W)w)->active - 1] = idles [--idlecnt];
1546 ev_stop (EV_A_ (W)w);
1547 }
1548
1549 void
1550 ev_prepare_start (EV_P_ struct ev_prepare *w)
1551 {
1552 if (expect_false (ev_is_active (w)))
1553 return;
1554
1555 ev_start (EV_A_ (W)w, ++preparecnt);
1556 array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
1557 prepares [preparecnt - 1] = w;
1558 }
1559
1560 void
1561 ev_prepare_stop (EV_P_ struct ev_prepare *w)
1562 {
1563 ev_clear_pending (EV_A_ (W)w);
1564 if (expect_false (!ev_is_active (w)))
1565 return;
1566
1567 prepares [((W)w)->active - 1] = prepares [--preparecnt];
1568 ev_stop (EV_A_ (W)w);
1569 }
1570
1571 void
1572 ev_check_start (EV_P_ struct ev_check *w)
1573 {
1574 if (expect_false (ev_is_active (w)))
1575 return;
1576
1577 ev_start (EV_A_ (W)w, ++checkcnt);
1578 array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
1579 checks [checkcnt - 1] = w;
1580 }
1581
1582 void
1583 ev_check_stop (EV_P_ struct ev_check *w)
1584 {
1585 ev_clear_pending (EV_A_ (W)w);
1586 if (expect_false (!ev_is_active (w)))
1587 return;
1588
1589 checks [((W)w)->active - 1] = checks [--checkcnt];
1590 ev_stop (EV_A_ (W)w);
1591 }
1592
1593 #ifndef SA_RESTART
1594 # define SA_RESTART 0
1595 #endif
1596
1597 void
1598 ev_signal_start (EV_P_ struct ev_signal *w)
1599 {
1600 #if EV_MULTIPLICITY
1601 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1602 #endif
1603 if (expect_false (ev_is_active (w)))
1604 return;
1605
1606 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1607
1608 ev_start (EV_A_ (W)w, 1);
1609 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1610 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
1611
1612 if (!((WL)w)->next)
1613 {
1614 #if _WIN32
1615 signal (w->signum, sighandler);
1616 #else
1617 struct sigaction sa;
1618 sa.sa_handler = sighandler;
1619 sigfillset (&sa.sa_mask);
1620 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1621 sigaction (w->signum, &sa, 0);
1622 #endif
1623 }
1624 }
1625
1626 void
1627 ev_signal_stop (EV_P_ struct ev_signal *w)
1628 {
1629 ev_clear_pending (EV_A_ (W)w);
1630 if (expect_false (!ev_is_active (w)))
1631 return;
1632
1633 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1634 ev_stop (EV_A_ (W)w);
1635
1636 if (!signals [w->signum - 1].head)
1637 signal (w->signum, SIG_DFL);
1638 }
1639
1640 void
1641 ev_child_start (EV_P_ struct ev_child *w)
1642 {
1643 #if EV_MULTIPLICITY
1644 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1645 #endif
1646 if (expect_false (ev_is_active (w)))
1647 return;
1648
1649 ev_start (EV_A_ (W)w, 1);
1650 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1651 }
1652
1653 void
1654 ev_child_stop (EV_P_ struct ev_child *w)
1655 {
1656 ev_clear_pending (EV_A_ (W)w);
1657 if (expect_false (!ev_is_active (w)))
1658 return;
1659
1660 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1661 ev_stop (EV_A_ (W)w);
1662 }
1663
1664 /*****************************************************************************/
1665
1666 struct ev_once
1667 {
1668 struct ev_io io;
1669 struct ev_timer to;
1670 void (*cb)(int revents, void *arg);
1671 void *arg;
1672 };
1673
1674 static void
1675 once_cb (EV_P_ struct ev_once *once, int revents)
1676 {
1677 void (*cb)(int revents, void *arg) = once->cb;
1678 void *arg = once->arg;
1679
1680 ev_io_stop (EV_A_ &once->io);
1681 ev_timer_stop (EV_A_ &once->to);
1682 ev_free (once);
1683
1684 cb (revents, arg);
1685 }
1686
1687 static void
1688 once_cb_io (EV_P_ struct ev_io *w, int revents)
1689 {
1690 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
1691 }
1692
1693 static void
1694 once_cb_to (EV_P_ struct ev_timer *w, int revents)
1695 {
1696 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
1697 }
1698
1699 void
1700 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
1701 {
1702 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
1703
1704 if (expect_false (!once))
1705 {
1706 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
1707 return;
1708 }
1709
1710 once->cb = cb;
1711 once->arg = arg;
1712
1713 ev_init (&once->io, once_cb_io);
1714 if (fd >= 0)
1715 {
1716 ev_io_set (&once->io, fd, events);
1717 ev_io_start (EV_A_ &once->io);
1718 }
1719
1720 ev_init (&once->to, once_cb_to);
1721 if (timeout >= 0.)
1722 {
1723 ev_timer_set (&once->to, timeout, 0.);
1724 ev_timer_start (EV_A_ &once->to);
1725 }
1726 }
1727
1728 #ifdef __cplusplus
1729 }
1730 #endif
1731