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Revision: 1.210
Committed: Sat Feb 9 00:34:11 2008 UTC (16 years, 5 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.209: +3 -2 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 #ifndef EV_STANDALONE
45 # ifdef EV_CONFIG_H
46 # include EV_CONFIG_H
47 # else
48 # include "config.h"
49 # endif
50
51 # if HAVE_CLOCK_GETTIME
52 # ifndef EV_USE_MONOTONIC
53 # define EV_USE_MONOTONIC 1
54 # endif
55 # ifndef EV_USE_REALTIME
56 # define EV_USE_REALTIME 1
57 # endif
58 # else
59 # ifndef EV_USE_MONOTONIC
60 # define EV_USE_MONOTONIC 0
61 # endif
62 # ifndef EV_USE_REALTIME
63 # define EV_USE_REALTIME 0
64 # endif
65 # endif
66
67 # ifndef EV_USE_NANOSLEEP
68 # if HAVE_NANOSLEEP
69 # define EV_USE_NANOSLEEP 1
70 # else
71 # define EV_USE_NANOSLEEP 0
72 # endif
73 # endif
74
75 # ifndef EV_USE_SELECT
76 # if HAVE_SELECT && HAVE_SYS_SELECT_H
77 # define EV_USE_SELECT 1
78 # else
79 # define EV_USE_SELECT 0
80 # endif
81 # endif
82
83 # ifndef EV_USE_POLL
84 # if HAVE_POLL && HAVE_POLL_H
85 # define EV_USE_POLL 1
86 # else
87 # define EV_USE_POLL 0
88 # endif
89 # endif
90
91 # ifndef EV_USE_EPOLL
92 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
93 # define EV_USE_EPOLL 1
94 # else
95 # define EV_USE_EPOLL 0
96 # endif
97 # endif
98
99 # ifndef EV_USE_KQUEUE
100 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
101 # define EV_USE_KQUEUE 1
102 # else
103 # define EV_USE_KQUEUE 0
104 # endif
105 # endif
106
107 # ifndef EV_USE_PORT
108 # if HAVE_PORT_H && HAVE_PORT_CREATE
109 # define EV_USE_PORT 1
110 # else
111 # define EV_USE_PORT 0
112 # endif
113 # endif
114
115 # ifndef EV_USE_INOTIFY
116 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
117 # define EV_USE_INOTIFY 1
118 # else
119 # define EV_USE_INOTIFY 0
120 # endif
121 # endif
122
123 #endif
124
125 #include <math.h>
126 #include <stdlib.h>
127 #include <fcntl.h>
128 #include <stddef.h>
129
130 #include <stdio.h>
131
132 #include <assert.h>
133 #include <errno.h>
134 #include <sys/types.h>
135 #include <time.h>
136
137 #include <signal.h>
138
139 #ifdef EV_H
140 # include EV_H
141 #else
142 # include "ev.h"
143 #endif
144
145 #ifndef _WIN32
146 # include <sys/time.h>
147 # include <sys/wait.h>
148 # include <unistd.h>
149 #else
150 # define WIN32_LEAN_AND_MEAN
151 # include <windows.h>
152 # ifndef EV_SELECT_IS_WINSOCKET
153 # define EV_SELECT_IS_WINSOCKET 1
154 # endif
155 #endif
156
157 /**/
158
159 #ifndef EV_USE_MONOTONIC
160 # define EV_USE_MONOTONIC 0
161 #endif
162
163 #ifndef EV_USE_REALTIME
164 # define EV_USE_REALTIME 0
165 #endif
166
167 #ifndef EV_USE_NANOSLEEP
168 # define EV_USE_NANOSLEEP 0
169 #endif
170
171 #ifndef EV_USE_SELECT
172 # define EV_USE_SELECT 1
173 #endif
174
175 #ifndef EV_USE_POLL
176 # ifdef _WIN32
177 # define EV_USE_POLL 0
178 # else
179 # define EV_USE_POLL 1
180 # endif
181 #endif
182
183 #ifndef EV_USE_EPOLL
184 # define EV_USE_EPOLL 0
185 #endif
186
187 #ifndef EV_USE_KQUEUE
188 # define EV_USE_KQUEUE 0
189 #endif
190
191 #ifndef EV_USE_PORT
192 # define EV_USE_PORT 0
193 #endif
194
195 #ifndef EV_USE_INOTIFY
196 # define EV_USE_INOTIFY 0
197 #endif
198
199 #ifndef EV_PID_HASHSIZE
200 # if EV_MINIMAL
201 # define EV_PID_HASHSIZE 1
202 # else
203 # define EV_PID_HASHSIZE 16
204 # endif
205 #endif
206
207 #ifndef EV_INOTIFY_HASHSIZE
208 # if EV_MINIMAL
209 # define EV_INOTIFY_HASHSIZE 1
210 # else
211 # define EV_INOTIFY_HASHSIZE 16
212 # endif
213 #endif
214
215 /**/
216
217 #ifndef CLOCK_MONOTONIC
218 # undef EV_USE_MONOTONIC
219 # define EV_USE_MONOTONIC 0
220 #endif
221
222 #ifndef CLOCK_REALTIME
223 # undef EV_USE_REALTIME
224 # define EV_USE_REALTIME 0
225 #endif
226
227 #if !EV_STAT_ENABLE
228 # undef EV_USE_INOTIFY
229 # define EV_USE_INOTIFY 0
230 #endif
231
232 #if !EV_USE_NANOSLEEP
233 # ifndef _WIN32
234 # include <sys/select.h>
235 # endif
236 #endif
237
238 #if EV_USE_INOTIFY
239 # include <sys/inotify.h>
240 #endif
241
242 #if EV_SELECT_IS_WINSOCKET
243 # include <winsock.h>
244 #endif
245
246 /**/
247
248 /*
249 * This is used to avoid floating point rounding problems.
250 * It is added to ev_rt_now when scheduling periodics
251 * to ensure progress, time-wise, even when rounding
252 * errors are against us.
253 * This value is good at least till the year 4000.
254 * Better solutions welcome.
255 */
256 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
257
258 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
259 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
260 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
261
262 #if __GNUC__ >= 4
263 # define expect(expr,value) __builtin_expect ((expr),(value))
264 # define noinline __attribute__ ((noinline))
265 #else
266 # define expect(expr,value) (expr)
267 # define noinline
268 # if __STDC_VERSION__ < 199901L
269 # define inline
270 # endif
271 #endif
272
273 #define expect_false(expr) expect ((expr) != 0, 0)
274 #define expect_true(expr) expect ((expr) != 0, 1)
275 #define inline_size static inline
276
277 #if EV_MINIMAL
278 # define inline_speed static noinline
279 #else
280 # define inline_speed static inline
281 #endif
282
283 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
284 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
285
286 #define EMPTY /* required for microsofts broken pseudo-c compiler */
287 #define EMPTY2(a,b) /* used to suppress some warnings */
288
289 typedef ev_watcher *W;
290 typedef ev_watcher_list *WL;
291 typedef ev_watcher_time *WT;
292
293 #if EV_USE_MONOTONIC
294 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
295 /* giving it a reasonably high chance of working on typical architetcures */
296 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
297 #endif
298
299 #ifdef _WIN32
300 # include "ev_win32.c"
301 #endif
302
303 /*****************************************************************************/
304
305 static void (*syserr_cb)(const char *msg);
306
307 void
308 ev_set_syserr_cb (void (*cb)(const char *msg))
309 {
310 syserr_cb = cb;
311 }
312
313 static void noinline
314 syserr (const char *msg)
315 {
316 if (!msg)
317 msg = "(libev) system error";
318
319 if (syserr_cb)
320 syserr_cb (msg);
321 else
322 {
323 perror (msg);
324 abort ();
325 }
326 }
327
328 static void *(*alloc)(void *ptr, long size);
329
330 void
331 ev_set_allocator (void *(*cb)(void *ptr, long size))
332 {
333 alloc = cb;
334 }
335
336 inline_speed void *
337 ev_realloc (void *ptr, long size)
338 {
339 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
340
341 if (!ptr && size)
342 {
343 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
344 abort ();
345 }
346
347 return ptr;
348 }
349
350 #define ev_malloc(size) ev_realloc (0, (size))
351 #define ev_free(ptr) ev_realloc ((ptr), 0)
352
353 /*****************************************************************************/
354
355 typedef struct
356 {
357 WL head;
358 unsigned char events;
359 unsigned char reify;
360 #if EV_SELECT_IS_WINSOCKET
361 SOCKET handle;
362 #endif
363 } ANFD;
364
365 typedef struct
366 {
367 W w;
368 int events;
369 } ANPENDING;
370
371 #if EV_USE_INOTIFY
372 typedef struct
373 {
374 WL head;
375 } ANFS;
376 #endif
377
378 #if EV_MULTIPLICITY
379
380 struct ev_loop
381 {
382 ev_tstamp ev_rt_now;
383 #define ev_rt_now ((loop)->ev_rt_now)
384 #define VAR(name,decl) decl;
385 #include "ev_vars.h"
386 #undef VAR
387 };
388 #include "ev_wrap.h"
389
390 static struct ev_loop default_loop_struct;
391 struct ev_loop *ev_default_loop_ptr;
392
393 #else
394
395 ev_tstamp ev_rt_now;
396 #define VAR(name,decl) static decl;
397 #include "ev_vars.h"
398 #undef VAR
399
400 static int ev_default_loop_ptr;
401
402 #endif
403
404 /*****************************************************************************/
405
406 ev_tstamp
407 ev_time (void)
408 {
409 #if EV_USE_REALTIME
410 struct timespec ts;
411 clock_gettime (CLOCK_REALTIME, &ts);
412 return ts.tv_sec + ts.tv_nsec * 1e-9;
413 #else
414 struct timeval tv;
415 gettimeofday (&tv, 0);
416 return tv.tv_sec + tv.tv_usec * 1e-6;
417 #endif
418 }
419
420 ev_tstamp inline_size
421 get_clock (void)
422 {
423 #if EV_USE_MONOTONIC
424 if (expect_true (have_monotonic))
425 {
426 struct timespec ts;
427 clock_gettime (CLOCK_MONOTONIC, &ts);
428 return ts.tv_sec + ts.tv_nsec * 1e-9;
429 }
430 #endif
431
432 return ev_time ();
433 }
434
435 #if EV_MULTIPLICITY
436 ev_tstamp
437 ev_now (EV_P)
438 {
439 return ev_rt_now;
440 }
441 #endif
442
443 void
444 ev_sleep (ev_tstamp delay)
445 {
446 if (delay > 0.)
447 {
448 #if EV_USE_NANOSLEEP
449 struct timespec ts;
450
451 ts.tv_sec = (time_t)delay;
452 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
453
454 nanosleep (&ts, 0);
455 #elif defined(_WIN32)
456 Sleep (delay * 1e3);
457 #else
458 struct timeval tv;
459
460 tv.tv_sec = (time_t)delay;
461 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
462
463 select (0, 0, 0, 0, &tv);
464 #endif
465 }
466 }
467
468 /*****************************************************************************/
469
470 int inline_size
471 array_nextsize (int elem, int cur, int cnt)
472 {
473 int ncur = cur + 1;
474
475 do
476 ncur <<= 1;
477 while (cnt > ncur);
478
479 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
480 if (elem * ncur > 4096)
481 {
482 ncur *= elem;
483 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
484 ncur = ncur - sizeof (void *) * 4;
485 ncur /= elem;
486 }
487
488 return ncur;
489 }
490
491 static noinline void *
492 array_realloc (int elem, void *base, int *cur, int cnt)
493 {
494 *cur = array_nextsize (elem, *cur, cnt);
495 return ev_realloc (base, elem * *cur);
496 }
497
498 #define array_needsize(type,base,cur,cnt,init) \
499 if (expect_false ((cnt) > (cur))) \
500 { \
501 int ocur_ = (cur); \
502 (base) = (type *)array_realloc \
503 (sizeof (type), (base), &(cur), (cnt)); \
504 init ((base) + (ocur_), (cur) - ocur_); \
505 }
506
507 #if 0
508 #define array_slim(type,stem) \
509 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
510 { \
511 stem ## max = array_roundsize (stem ## cnt >> 1); \
512 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
513 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
514 }
515 #endif
516
517 #define array_free(stem, idx) \
518 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
519
520 /*****************************************************************************/
521
522 void noinline
523 ev_feed_event (EV_P_ void *w, int revents)
524 {
525 W w_ = (W)w;
526 int pri = ABSPRI (w_);
527
528 if (expect_false (w_->pending))
529 pendings [pri][w_->pending - 1].events |= revents;
530 else
531 {
532 w_->pending = ++pendingcnt [pri];
533 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
534 pendings [pri][w_->pending - 1].w = w_;
535 pendings [pri][w_->pending - 1].events = revents;
536 }
537 }
538
539 void inline_speed
540 queue_events (EV_P_ W *events, int eventcnt, int type)
541 {
542 int i;
543
544 for (i = 0; i < eventcnt; ++i)
545 ev_feed_event (EV_A_ events [i], type);
546 }
547
548 /*****************************************************************************/
549
550 void inline_size
551 anfds_init (ANFD *base, int count)
552 {
553 while (count--)
554 {
555 base->head = 0;
556 base->events = EV_NONE;
557 base->reify = 0;
558
559 ++base;
560 }
561 }
562
563 void inline_speed
564 fd_event (EV_P_ int fd, int revents)
565 {
566 ANFD *anfd = anfds + fd;
567 ev_io *w;
568
569 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
570 {
571 int ev = w->events & revents;
572
573 if (ev)
574 ev_feed_event (EV_A_ (W)w, ev);
575 }
576 }
577
578 void
579 ev_feed_fd_event (EV_P_ int fd, int revents)
580 {
581 if (fd >= 0 && fd < anfdmax)
582 fd_event (EV_A_ fd, revents);
583 }
584
585 void inline_size
586 fd_reify (EV_P)
587 {
588 int i;
589
590 for (i = 0; i < fdchangecnt; ++i)
591 {
592 int fd = fdchanges [i];
593 ANFD *anfd = anfds + fd;
594 ev_io *w;
595
596 unsigned char events = 0;
597
598 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
599 events |= (unsigned char)w->events;
600
601 #if EV_SELECT_IS_WINSOCKET
602 if (events)
603 {
604 unsigned long argp;
605 #ifdef EV_FD_TO_WIN32_HANDLE
606 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
607 #else
608 anfd->handle = _get_osfhandle (fd);
609 #endif
610 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
611 }
612 #endif
613
614 {
615 unsigned char o_events = anfd->events;
616 unsigned char o_reify = anfd->reify;
617
618 anfd->reify = 0;
619 anfd->events = events;
620
621 if (o_events != events || o_reify & EV_IOFDSET)
622 backend_modify (EV_A_ fd, o_events, events);
623 }
624 }
625
626 fdchangecnt = 0;
627 }
628
629 void inline_size
630 fd_change (EV_P_ int fd, int flags)
631 {
632 unsigned char reify = anfds [fd].reify;
633 anfds [fd].reify |= flags;
634
635 if (expect_true (!reify))
636 {
637 ++fdchangecnt;
638 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
639 fdchanges [fdchangecnt - 1] = fd;
640 }
641 }
642
643 void inline_speed
644 fd_kill (EV_P_ int fd)
645 {
646 ev_io *w;
647
648 while ((w = (ev_io *)anfds [fd].head))
649 {
650 ev_io_stop (EV_A_ w);
651 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
652 }
653 }
654
655 int inline_size
656 fd_valid (int fd)
657 {
658 #ifdef _WIN32
659 return _get_osfhandle (fd) != -1;
660 #else
661 return fcntl (fd, F_GETFD) != -1;
662 #endif
663 }
664
665 /* called on EBADF to verify fds */
666 static void noinline
667 fd_ebadf (EV_P)
668 {
669 int fd;
670
671 for (fd = 0; fd < anfdmax; ++fd)
672 if (anfds [fd].events)
673 if (!fd_valid (fd) == -1 && errno == EBADF)
674 fd_kill (EV_A_ fd);
675 }
676
677 /* called on ENOMEM in select/poll to kill some fds and retry */
678 static void noinline
679 fd_enomem (EV_P)
680 {
681 int fd;
682
683 for (fd = anfdmax; fd--; )
684 if (anfds [fd].events)
685 {
686 fd_kill (EV_A_ fd);
687 return;
688 }
689 }
690
691 /* usually called after fork if backend needs to re-arm all fds from scratch */
692 static void noinline
693 fd_rearm_all (EV_P)
694 {
695 int fd;
696
697 for (fd = 0; fd < anfdmax; ++fd)
698 if (anfds [fd].events)
699 {
700 anfds [fd].events = 0;
701 fd_change (EV_A_ fd, EV_IOFDSET | 1);
702 }
703 }
704
705 /*****************************************************************************/
706
707 void inline_speed
708 upheap (WT *heap, int k)
709 {
710 WT w = heap [k];
711
712 while (k)
713 {
714 int p = (k - 1) >> 1;
715
716 if (heap [p]->at <= w->at)
717 break;
718
719 heap [k] = heap [p];
720 ((W)heap [k])->active = k + 1;
721 k = p;
722 }
723
724 heap [k] = w;
725 ((W)heap [k])->active = k + 1;
726 }
727
728 void inline_speed
729 downheap (WT *heap, int N, int k)
730 {
731 WT w = heap [k];
732
733 for (;;)
734 {
735 int c = (k << 1) + 1;
736
737 if (c >= N)
738 break;
739
740 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
741 ? 1 : 0;
742
743 if (w->at <= heap [c]->at)
744 break;
745
746 heap [k] = heap [c];
747 ((W)heap [k])->active = k + 1;
748
749 k = c;
750 }
751
752 heap [k] = w;
753 ((W)heap [k])->active = k + 1;
754 }
755
756 void inline_size
757 adjustheap (WT *heap, int N, int k)
758 {
759 upheap (heap, k);
760 downheap (heap, N, k);
761 }
762
763 /*****************************************************************************/
764
765 typedef struct
766 {
767 WL head;
768 EV_ATOMIC_T gotsig;
769 } ANSIG;
770
771 static ANSIG *signals;
772 static int signalmax;
773
774 static EV_ATOMIC_T gotsig;
775
776 void inline_size
777 signals_init (ANSIG *base, int count)
778 {
779 while (count--)
780 {
781 base->head = 0;
782 base->gotsig = 0;
783
784 ++base;
785 }
786 }
787
788 /*****************************************************************************/
789
790 void inline_speed
791 fd_intern (int fd)
792 {
793 #ifdef _WIN32
794 int arg = 1;
795 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
796 #else
797 fcntl (fd, F_SETFD, FD_CLOEXEC);
798 fcntl (fd, F_SETFL, O_NONBLOCK);
799 #endif
800 }
801
802 static void noinline
803 evpipe_init (EV_P)
804 {
805 if (!ev_is_active (&pipeev))
806 {
807 while (pipe (evpipe))
808 syserr ("(libev) error creating signal/async pipe");
809
810 fd_intern (evpipe [0]);
811 fd_intern (evpipe [1]);
812
813 ev_io_set (&pipeev, evpipe [0], EV_READ);
814 ev_io_start (EV_A_ &pipeev);
815 ev_unref (EV_A); /* watcher should not keep loop alive */
816 }
817 }
818
819 void inline_size
820 evpipe_write (EV_P_ int sig, int async)
821 {
822 if (!(gotasync || gotsig))
823 {
824 int old_errno = errno; /* save errno becaue write might clobber it */
825
826 if (sig) gotsig = 1;
827 if (async) gotasync = 1;
828
829 write (evpipe [1], &old_errno, 1);
830
831 errno = old_errno;
832 }
833 }
834
835 static void
836 pipecb (EV_P_ ev_io *iow, int revents)
837 {
838 {
839 int dummy;
840 read (evpipe [0], &dummy, 1);
841 }
842
843 if (gotsig)
844 {
845 int signum;
846 gotsig = 0;
847
848 for (signum = signalmax; signum--; )
849 if (signals [signum].gotsig)
850 ev_feed_signal_event (EV_A_ signum + 1);
851 }
852
853 #if EV_ASYNC_ENABLE
854 if (gotasync)
855 {
856 int i;
857 gotasync = 0;
858
859 for (i = asynccnt; i--; )
860 if (asyncs [i]->sent)
861 {
862 asyncs [i]->sent = 0;
863 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
864 }
865 }
866 #endif
867 }
868
869 /*****************************************************************************/
870
871 static void
872 sighandler (int signum)
873 {
874 #if EV_MULTIPLICITY
875 struct ev_loop *loop = &default_loop_struct;
876 #endif
877
878 #if _WIN32
879 signal (signum, sighandler);
880 #endif
881
882 signals [signum - 1].gotsig = 1;
883 evpipe_write (EV_A_ 1, 0);
884 }
885
886 void noinline
887 ev_feed_signal_event (EV_P_ int signum)
888 {
889 WL w;
890
891 #if EV_MULTIPLICITY
892 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
893 #endif
894
895 --signum;
896
897 if (signum < 0 || signum >= signalmax)
898 return;
899
900 signals [signum].gotsig = 0;
901
902 for (w = signals [signum].head; w; w = w->next)
903 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
904 }
905
906 /*****************************************************************************/
907
908 static WL childs [EV_PID_HASHSIZE];
909
910 #ifndef _WIN32
911
912 static ev_signal childev;
913
914 #ifndef WIFCONTINUED
915 # define WIFCONTINUED(status) 0
916 #endif
917
918 void inline_speed
919 child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
920 {
921 ev_child *w;
922 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
923
924 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
925 {
926 if ((w->pid == pid || !w->pid)
927 && (!traced || (w->flags & 1)))
928 {
929 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
930 w->rpid = pid;
931 w->rstatus = status;
932 ev_feed_event (EV_A_ (W)w, EV_CHILD);
933 }
934 }
935 }
936
937 #ifndef WCONTINUED
938 # define WCONTINUED 0
939 #endif
940
941 static void
942 childcb (EV_P_ ev_signal *sw, int revents)
943 {
944 int pid, status;
945
946 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
947 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
948 if (!WCONTINUED
949 || errno != EINVAL
950 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
951 return;
952
953 /* make sure we are called again until all childs have been reaped */
954 /* we need to do it this way so that the callback gets called before we continue */
955 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
956
957 child_reap (EV_A_ sw, pid, pid, status);
958 if (EV_PID_HASHSIZE > 1)
959 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
960 }
961
962 #endif
963
964 /*****************************************************************************/
965
966 #if EV_USE_PORT
967 # include "ev_port.c"
968 #endif
969 #if EV_USE_KQUEUE
970 # include "ev_kqueue.c"
971 #endif
972 #if EV_USE_EPOLL
973 # include "ev_epoll.c"
974 #endif
975 #if EV_USE_POLL
976 # include "ev_poll.c"
977 #endif
978 #if EV_USE_SELECT
979 # include "ev_select.c"
980 #endif
981
982 int
983 ev_version_major (void)
984 {
985 return EV_VERSION_MAJOR;
986 }
987
988 int
989 ev_version_minor (void)
990 {
991 return EV_VERSION_MINOR;
992 }
993
994 /* return true if we are running with elevated privileges and should ignore env variables */
995 int inline_size
996 enable_secure (void)
997 {
998 #ifdef _WIN32
999 return 0;
1000 #else
1001 return getuid () != geteuid ()
1002 || getgid () != getegid ();
1003 #endif
1004 }
1005
1006 unsigned int
1007 ev_supported_backends (void)
1008 {
1009 unsigned int flags = 0;
1010
1011 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1012 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1013 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1014 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1015 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1016
1017 return flags;
1018 }
1019
1020 unsigned int
1021 ev_recommended_backends (void)
1022 {
1023 unsigned int flags = ev_supported_backends ();
1024
1025 #ifndef __NetBSD__
1026 /* kqueue is borked on everything but netbsd apparently */
1027 /* it usually doesn't work correctly on anything but sockets and pipes */
1028 flags &= ~EVBACKEND_KQUEUE;
1029 #endif
1030 #ifdef __APPLE__
1031 // flags &= ~EVBACKEND_KQUEUE; for documentation
1032 flags &= ~EVBACKEND_POLL;
1033 #endif
1034
1035 return flags;
1036 }
1037
1038 unsigned int
1039 ev_embeddable_backends (void)
1040 {
1041 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1042
1043 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1044 /* please fix it and tell me how to detect the fix */
1045 flags &= ~EVBACKEND_EPOLL;
1046
1047 return flags;
1048 }
1049
1050 unsigned int
1051 ev_backend (EV_P)
1052 {
1053 return backend;
1054 }
1055
1056 unsigned int
1057 ev_loop_count (EV_P)
1058 {
1059 return loop_count;
1060 }
1061
1062 void
1063 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1064 {
1065 io_blocktime = interval;
1066 }
1067
1068 void
1069 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1070 {
1071 timeout_blocktime = interval;
1072 }
1073
1074 static void noinline
1075 loop_init (EV_P_ unsigned int flags)
1076 {
1077 if (!backend)
1078 {
1079 #if EV_USE_MONOTONIC
1080 {
1081 struct timespec ts;
1082 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1083 have_monotonic = 1;
1084 }
1085 #endif
1086
1087 ev_rt_now = ev_time ();
1088 mn_now = get_clock ();
1089 now_floor = mn_now;
1090 rtmn_diff = ev_rt_now - mn_now;
1091
1092 io_blocktime = 0.;
1093 timeout_blocktime = 0.;
1094 backend = 0;
1095 backend_fd = -1;
1096 gotasync = 0;
1097 #if EV_USE_INOTIFY
1098 fs_fd = -2;
1099 #endif
1100
1101 /* pid check not overridable via env */
1102 #ifndef _WIN32
1103 if (flags & EVFLAG_FORKCHECK)
1104 curpid = getpid ();
1105 #endif
1106
1107 if (!(flags & EVFLAG_NOENV)
1108 && !enable_secure ()
1109 && getenv ("LIBEV_FLAGS"))
1110 flags = atoi (getenv ("LIBEV_FLAGS"));
1111
1112 if (!(flags & 0x0000ffffUL))
1113 flags |= ev_recommended_backends ();
1114
1115 #if EV_USE_PORT
1116 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1117 #endif
1118 #if EV_USE_KQUEUE
1119 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1120 #endif
1121 #if EV_USE_EPOLL
1122 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1123 #endif
1124 #if EV_USE_POLL
1125 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1126 #endif
1127 #if EV_USE_SELECT
1128 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1129 #endif
1130
1131 ev_init (&pipeev, pipecb);
1132 ev_set_priority (&pipeev, EV_MAXPRI);
1133 }
1134 }
1135
1136 static void noinline
1137 loop_destroy (EV_P)
1138 {
1139 int i;
1140
1141 if (ev_is_active (&pipeev))
1142 {
1143 ev_ref (EV_A); /* signal watcher */
1144 ev_io_stop (EV_A_ &pipeev);
1145
1146 close (evpipe [0]); evpipe [0] = 0;
1147 close (evpipe [1]); evpipe [1] = 0;
1148 }
1149
1150 #if EV_USE_INOTIFY
1151 if (fs_fd >= 0)
1152 close (fs_fd);
1153 #endif
1154
1155 if (backend_fd >= 0)
1156 close (backend_fd);
1157
1158 #if EV_USE_PORT
1159 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1160 #endif
1161 #if EV_USE_KQUEUE
1162 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1163 #endif
1164 #if EV_USE_EPOLL
1165 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1166 #endif
1167 #if EV_USE_POLL
1168 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1169 #endif
1170 #if EV_USE_SELECT
1171 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1172 #endif
1173
1174 for (i = NUMPRI; i--; )
1175 {
1176 array_free (pending, [i]);
1177 #if EV_IDLE_ENABLE
1178 array_free (idle, [i]);
1179 #endif
1180 }
1181
1182 ev_free (anfds); anfdmax = 0;
1183
1184 /* have to use the microsoft-never-gets-it-right macro */
1185 array_free (fdchange, EMPTY);
1186 array_free (timer, EMPTY);
1187 #if EV_PERIODIC_ENABLE
1188 array_free (periodic, EMPTY);
1189 #endif
1190 #if EV_FORK_ENABLE
1191 array_free (fork, EMPTY);
1192 #endif
1193 array_free (prepare, EMPTY);
1194 array_free (check, EMPTY);
1195 #if EV_ASYNC_ENABLE
1196 array_free (async, EMPTY);
1197 #endif
1198
1199 backend = 0;
1200 }
1201
1202 void inline_size infy_fork (EV_P);
1203
1204 void inline_size
1205 loop_fork (EV_P)
1206 {
1207 #if EV_USE_PORT
1208 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1209 #endif
1210 #if EV_USE_KQUEUE
1211 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1212 #endif
1213 #if EV_USE_EPOLL
1214 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1215 #endif
1216 #if EV_USE_INOTIFY
1217 infy_fork (EV_A);
1218 #endif
1219
1220 if (ev_is_active (&pipeev))
1221 {
1222 /* this "locks" the handlers against writing to the pipe */
1223 gotsig = gotasync = 1;
1224
1225 ev_ref (EV_A);
1226 ev_io_stop (EV_A_ &pipeev);
1227 close (evpipe [0]);
1228 close (evpipe [1]);
1229
1230 evpipe_init (EV_A);
1231 /* now iterate over everything, in case we missed something */
1232 pipecb (EV_A_ &pipeev, EV_READ);
1233 }
1234
1235 postfork = 0;
1236 }
1237
1238 #if EV_MULTIPLICITY
1239 struct ev_loop *
1240 ev_loop_new (unsigned int flags)
1241 {
1242 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1243
1244 memset (loop, 0, sizeof (struct ev_loop));
1245
1246 loop_init (EV_A_ flags);
1247
1248 if (ev_backend (EV_A))
1249 return loop;
1250
1251 return 0;
1252 }
1253
1254 void
1255 ev_loop_destroy (EV_P)
1256 {
1257 loop_destroy (EV_A);
1258 ev_free (loop);
1259 }
1260
1261 void
1262 ev_loop_fork (EV_P)
1263 {
1264 postfork = 1; /* must be in line with ev_default_fork */
1265 }
1266
1267 #endif
1268
1269 #if EV_MULTIPLICITY
1270 struct ev_loop *
1271 ev_default_loop_init (unsigned int flags)
1272 #else
1273 int
1274 ev_default_loop (unsigned int flags)
1275 #endif
1276 {
1277 if (!ev_default_loop_ptr)
1278 {
1279 #if EV_MULTIPLICITY
1280 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1281 #else
1282 ev_default_loop_ptr = 1;
1283 #endif
1284
1285 loop_init (EV_A_ flags);
1286
1287 if (ev_backend (EV_A))
1288 {
1289 #ifndef _WIN32
1290 ev_signal_init (&childev, childcb, SIGCHLD);
1291 ev_set_priority (&childev, EV_MAXPRI);
1292 ev_signal_start (EV_A_ &childev);
1293 ev_unref (EV_A); /* child watcher should not keep loop alive */
1294 #endif
1295 }
1296 else
1297 ev_default_loop_ptr = 0;
1298 }
1299
1300 return ev_default_loop_ptr;
1301 }
1302
1303 void
1304 ev_default_destroy (void)
1305 {
1306 #if EV_MULTIPLICITY
1307 struct ev_loop *loop = ev_default_loop_ptr;
1308 #endif
1309
1310 #ifndef _WIN32
1311 ev_ref (EV_A); /* child watcher */
1312 ev_signal_stop (EV_A_ &childev);
1313 #endif
1314
1315 loop_destroy (EV_A);
1316 }
1317
1318 void
1319 ev_default_fork (void)
1320 {
1321 #if EV_MULTIPLICITY
1322 struct ev_loop *loop = ev_default_loop_ptr;
1323 #endif
1324
1325 if (backend)
1326 postfork = 1; /* must be in line with ev_loop_fork */
1327 }
1328
1329 /*****************************************************************************/
1330
1331 void
1332 ev_invoke (EV_P_ void *w, int revents)
1333 {
1334 EV_CB_INVOKE ((W)w, revents);
1335 }
1336
1337 void inline_speed
1338 call_pending (EV_P)
1339 {
1340 int pri;
1341
1342 for (pri = NUMPRI; pri--; )
1343 while (pendingcnt [pri])
1344 {
1345 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1346
1347 if (expect_true (p->w))
1348 {
1349 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1350
1351 p->w->pending = 0;
1352 EV_CB_INVOKE (p->w, p->events);
1353 }
1354 }
1355 }
1356
1357 void inline_size
1358 timers_reify (EV_P)
1359 {
1360 while (timercnt && ((WT)timers [0])->at <= mn_now)
1361 {
1362 ev_timer *w = (ev_timer *)timers [0];
1363
1364 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1365
1366 /* first reschedule or stop timer */
1367 if (w->repeat)
1368 {
1369 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1370
1371 ((WT)w)->at += w->repeat;
1372 if (((WT)w)->at < mn_now)
1373 ((WT)w)->at = mn_now;
1374
1375 downheap (timers, timercnt, 0);
1376 }
1377 else
1378 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1379
1380 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1381 }
1382 }
1383
1384 #if EV_PERIODIC_ENABLE
1385 void inline_size
1386 periodics_reify (EV_P)
1387 {
1388 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1389 {
1390 ev_periodic *w = (ev_periodic *)periodics [0];
1391
1392 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1393
1394 /* first reschedule or stop timer */
1395 if (w->reschedule_cb)
1396 {
1397 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1398 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1399 downheap (periodics, periodiccnt, 0);
1400 }
1401 else if (w->interval)
1402 {
1403 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1404 if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
1405 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1406 downheap (periodics, periodiccnt, 0);
1407 }
1408 else
1409 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1410
1411 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1412 }
1413 }
1414
1415 static void noinline
1416 periodics_reschedule (EV_P)
1417 {
1418 int i;
1419
1420 /* adjust periodics after time jump */
1421 for (i = 0; i < periodiccnt; ++i)
1422 {
1423 ev_periodic *w = (ev_periodic *)periodics [i];
1424
1425 if (w->reschedule_cb)
1426 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1427 else if (w->interval)
1428 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1429 }
1430
1431 /* now rebuild the heap */
1432 for (i = periodiccnt >> 1; i--; )
1433 downheap (periodics, periodiccnt, i);
1434 }
1435 #endif
1436
1437 #if EV_IDLE_ENABLE
1438 void inline_size
1439 idle_reify (EV_P)
1440 {
1441 if (expect_false (idleall))
1442 {
1443 int pri;
1444
1445 for (pri = NUMPRI; pri--; )
1446 {
1447 if (pendingcnt [pri])
1448 break;
1449
1450 if (idlecnt [pri])
1451 {
1452 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1453 break;
1454 }
1455 }
1456 }
1457 }
1458 #endif
1459
1460 void inline_speed
1461 time_update (EV_P_ ev_tstamp max_block)
1462 {
1463 int i;
1464
1465 #if EV_USE_MONOTONIC
1466 if (expect_true (have_monotonic))
1467 {
1468 ev_tstamp odiff = rtmn_diff;
1469
1470 mn_now = get_clock ();
1471
1472 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1473 /* interpolate in the meantime */
1474 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1475 {
1476 ev_rt_now = rtmn_diff + mn_now;
1477 return;
1478 }
1479
1480 now_floor = mn_now;
1481 ev_rt_now = ev_time ();
1482
1483 /* loop a few times, before making important decisions.
1484 * on the choice of "4": one iteration isn't enough,
1485 * in case we get preempted during the calls to
1486 * ev_time and get_clock. a second call is almost guaranteed
1487 * to succeed in that case, though. and looping a few more times
1488 * doesn't hurt either as we only do this on time-jumps or
1489 * in the unlikely event of having been preempted here.
1490 */
1491 for (i = 4; --i; )
1492 {
1493 rtmn_diff = ev_rt_now - mn_now;
1494
1495 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1496 return; /* all is well */
1497
1498 ev_rt_now = ev_time ();
1499 mn_now = get_clock ();
1500 now_floor = mn_now;
1501 }
1502
1503 # if EV_PERIODIC_ENABLE
1504 periodics_reschedule (EV_A);
1505 # endif
1506 /* no timer adjustment, as the monotonic clock doesn't jump */
1507 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1508 }
1509 else
1510 #endif
1511 {
1512 ev_rt_now = ev_time ();
1513
1514 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1515 {
1516 #if EV_PERIODIC_ENABLE
1517 periodics_reschedule (EV_A);
1518 #endif
1519 /* adjust timers. this is easy, as the offset is the same for all of them */
1520 for (i = 0; i < timercnt; ++i)
1521 ((WT)timers [i])->at += ev_rt_now - mn_now;
1522 }
1523
1524 mn_now = ev_rt_now;
1525 }
1526 }
1527
1528 void
1529 ev_ref (EV_P)
1530 {
1531 ++activecnt;
1532 }
1533
1534 void
1535 ev_unref (EV_P)
1536 {
1537 --activecnt;
1538 }
1539
1540 static int loop_done;
1541
1542 void
1543 ev_loop (EV_P_ int flags)
1544 {
1545 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1546 ? EVUNLOOP_ONE
1547 : EVUNLOOP_CANCEL;
1548
1549 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1550
1551 do
1552 {
1553 #ifndef _WIN32
1554 if (expect_false (curpid)) /* penalise the forking check even more */
1555 if (expect_false (getpid () != curpid))
1556 {
1557 curpid = getpid ();
1558 postfork = 1;
1559 }
1560 #endif
1561
1562 #if EV_FORK_ENABLE
1563 /* we might have forked, so queue fork handlers */
1564 if (expect_false (postfork))
1565 if (forkcnt)
1566 {
1567 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1568 call_pending (EV_A);
1569 }
1570 #endif
1571
1572 /* queue prepare watchers (and execute them) */
1573 if (expect_false (preparecnt))
1574 {
1575 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1576 call_pending (EV_A);
1577 }
1578
1579 if (expect_false (!activecnt))
1580 break;
1581
1582 /* we might have forked, so reify kernel state if necessary */
1583 if (expect_false (postfork))
1584 loop_fork (EV_A);
1585
1586 /* update fd-related kernel structures */
1587 fd_reify (EV_A);
1588
1589 /* calculate blocking time */
1590 {
1591 ev_tstamp waittime = 0.;
1592 ev_tstamp sleeptime = 0.;
1593
1594 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1595 {
1596 /* update time to cancel out callback processing overhead */
1597 time_update (EV_A_ 1e100);
1598
1599 waittime = MAX_BLOCKTIME;
1600
1601 if (timercnt)
1602 {
1603 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1604 if (waittime > to) waittime = to;
1605 }
1606
1607 #if EV_PERIODIC_ENABLE
1608 if (periodiccnt)
1609 {
1610 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1611 if (waittime > to) waittime = to;
1612 }
1613 #endif
1614
1615 if (expect_false (waittime < timeout_blocktime))
1616 waittime = timeout_blocktime;
1617
1618 sleeptime = waittime - backend_fudge;
1619
1620 if (expect_true (sleeptime > io_blocktime))
1621 sleeptime = io_blocktime;
1622
1623 if (sleeptime)
1624 {
1625 ev_sleep (sleeptime);
1626 waittime -= sleeptime;
1627 }
1628 }
1629
1630 ++loop_count;
1631 backend_poll (EV_A_ waittime);
1632
1633 /* update ev_rt_now, do magic */
1634 time_update (EV_A_ waittime + sleeptime);
1635 }
1636
1637 /* queue pending timers and reschedule them */
1638 timers_reify (EV_A); /* relative timers called last */
1639 #if EV_PERIODIC_ENABLE
1640 periodics_reify (EV_A); /* absolute timers called first */
1641 #endif
1642
1643 #if EV_IDLE_ENABLE
1644 /* queue idle watchers unless other events are pending */
1645 idle_reify (EV_A);
1646 #endif
1647
1648 /* queue check watchers, to be executed first */
1649 if (expect_false (checkcnt))
1650 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1651
1652 call_pending (EV_A);
1653
1654 }
1655 while (expect_true (activecnt && !loop_done));
1656
1657 if (loop_done == EVUNLOOP_ONE)
1658 loop_done = EVUNLOOP_CANCEL;
1659 }
1660
1661 void
1662 ev_unloop (EV_P_ int how)
1663 {
1664 loop_done = how;
1665 }
1666
1667 /*****************************************************************************/
1668
1669 void inline_size
1670 wlist_add (WL *head, WL elem)
1671 {
1672 elem->next = *head;
1673 *head = elem;
1674 }
1675
1676 void inline_size
1677 wlist_del (WL *head, WL elem)
1678 {
1679 while (*head)
1680 {
1681 if (*head == elem)
1682 {
1683 *head = elem->next;
1684 return;
1685 }
1686
1687 head = &(*head)->next;
1688 }
1689 }
1690
1691 void inline_speed
1692 clear_pending (EV_P_ W w)
1693 {
1694 if (w->pending)
1695 {
1696 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1697 w->pending = 0;
1698 }
1699 }
1700
1701 int
1702 ev_clear_pending (EV_P_ void *w)
1703 {
1704 W w_ = (W)w;
1705 int pending = w_->pending;
1706
1707 if (expect_true (pending))
1708 {
1709 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1710 w_->pending = 0;
1711 p->w = 0;
1712 return p->events;
1713 }
1714 else
1715 return 0;
1716 }
1717
1718 void inline_size
1719 pri_adjust (EV_P_ W w)
1720 {
1721 int pri = w->priority;
1722 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1723 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1724 w->priority = pri;
1725 }
1726
1727 void inline_speed
1728 ev_start (EV_P_ W w, int active)
1729 {
1730 pri_adjust (EV_A_ w);
1731 w->active = active;
1732 ev_ref (EV_A);
1733 }
1734
1735 void inline_size
1736 ev_stop (EV_P_ W w)
1737 {
1738 ev_unref (EV_A);
1739 w->active = 0;
1740 }
1741
1742 /*****************************************************************************/
1743
1744 void noinline
1745 ev_io_start (EV_P_ ev_io *w)
1746 {
1747 int fd = w->fd;
1748
1749 if (expect_false (ev_is_active (w)))
1750 return;
1751
1752 assert (("ev_io_start called with negative fd", fd >= 0));
1753
1754 ev_start (EV_A_ (W)w, 1);
1755 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1756 wlist_add (&anfds[fd].head, (WL)w);
1757
1758 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1759 w->events &= ~EV_IOFDSET;
1760 }
1761
1762 void noinline
1763 ev_io_stop (EV_P_ ev_io *w)
1764 {
1765 clear_pending (EV_A_ (W)w);
1766 if (expect_false (!ev_is_active (w)))
1767 return;
1768
1769 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1770
1771 wlist_del (&anfds[w->fd].head, (WL)w);
1772 ev_stop (EV_A_ (W)w);
1773
1774 fd_change (EV_A_ w->fd, 1);
1775 }
1776
1777 void noinline
1778 ev_timer_start (EV_P_ ev_timer *w)
1779 {
1780 if (expect_false (ev_is_active (w)))
1781 return;
1782
1783 ((WT)w)->at += mn_now;
1784
1785 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1786
1787 ev_start (EV_A_ (W)w, ++timercnt);
1788 array_needsize (WT, timers, timermax, timercnt, EMPTY2);
1789 timers [timercnt - 1] = (WT)w;
1790 upheap (timers, timercnt - 1);
1791
1792 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1793 }
1794
1795 void noinline
1796 ev_timer_stop (EV_P_ ev_timer *w)
1797 {
1798 clear_pending (EV_A_ (W)w);
1799 if (expect_false (!ev_is_active (w)))
1800 return;
1801
1802 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
1803
1804 {
1805 int active = ((W)w)->active;
1806
1807 if (expect_true (--active < --timercnt))
1808 {
1809 timers [active] = timers [timercnt];
1810 adjustheap (timers, timercnt, active);
1811 }
1812 }
1813
1814 ((WT)w)->at -= mn_now;
1815
1816 ev_stop (EV_A_ (W)w);
1817 }
1818
1819 void noinline
1820 ev_timer_again (EV_P_ ev_timer *w)
1821 {
1822 if (ev_is_active (w))
1823 {
1824 if (w->repeat)
1825 {
1826 ((WT)w)->at = mn_now + w->repeat;
1827 adjustheap (timers, timercnt, ((W)w)->active - 1);
1828 }
1829 else
1830 ev_timer_stop (EV_A_ w);
1831 }
1832 else if (w->repeat)
1833 {
1834 w->at = w->repeat;
1835 ev_timer_start (EV_A_ w);
1836 }
1837 }
1838
1839 #if EV_PERIODIC_ENABLE
1840 void noinline
1841 ev_periodic_start (EV_P_ ev_periodic *w)
1842 {
1843 if (expect_false (ev_is_active (w)))
1844 return;
1845
1846 if (w->reschedule_cb)
1847 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1848 else if (w->interval)
1849 {
1850 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1851 /* this formula differs from the one in periodic_reify because we do not always round up */
1852 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1853 }
1854 else
1855 ((WT)w)->at = w->offset;
1856
1857 ev_start (EV_A_ (W)w, ++periodiccnt);
1858 array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
1859 periodics [periodiccnt - 1] = (WT)w;
1860 upheap (periodics, periodiccnt - 1);
1861
1862 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1863 }
1864
1865 void noinline
1866 ev_periodic_stop (EV_P_ ev_periodic *w)
1867 {
1868 clear_pending (EV_A_ (W)w);
1869 if (expect_false (!ev_is_active (w)))
1870 return;
1871
1872 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
1873
1874 {
1875 int active = ((W)w)->active;
1876
1877 if (expect_true (--active < --periodiccnt))
1878 {
1879 periodics [active] = periodics [periodiccnt];
1880 adjustheap (periodics, periodiccnt, active);
1881 }
1882 }
1883
1884 ev_stop (EV_A_ (W)w);
1885 }
1886
1887 void noinline
1888 ev_periodic_again (EV_P_ ev_periodic *w)
1889 {
1890 /* TODO: use adjustheap and recalculation */
1891 ev_periodic_stop (EV_A_ w);
1892 ev_periodic_start (EV_A_ w);
1893 }
1894 #endif
1895
1896 #ifndef SA_RESTART
1897 # define SA_RESTART 0
1898 #endif
1899
1900 void noinline
1901 ev_signal_start (EV_P_ ev_signal *w)
1902 {
1903 #if EV_MULTIPLICITY
1904 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1905 #endif
1906 if (expect_false (ev_is_active (w)))
1907 return;
1908
1909 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1910
1911 evpipe_init (EV_A);
1912
1913 {
1914 #ifndef _WIN32
1915 sigset_t full, prev;
1916 sigfillset (&full);
1917 sigprocmask (SIG_SETMASK, &full, &prev);
1918 #endif
1919
1920 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1921
1922 #ifndef _WIN32
1923 sigprocmask (SIG_SETMASK, &prev, 0);
1924 #endif
1925 }
1926
1927 ev_start (EV_A_ (W)w, 1);
1928 wlist_add (&signals [w->signum - 1].head, (WL)w);
1929
1930 if (!((WL)w)->next)
1931 {
1932 #if _WIN32
1933 signal (w->signum, sighandler);
1934 #else
1935 struct sigaction sa;
1936 sa.sa_handler = sighandler;
1937 sigfillset (&sa.sa_mask);
1938 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1939 sigaction (w->signum, &sa, 0);
1940 #endif
1941 }
1942 }
1943
1944 void noinline
1945 ev_signal_stop (EV_P_ ev_signal *w)
1946 {
1947 clear_pending (EV_A_ (W)w);
1948 if (expect_false (!ev_is_active (w)))
1949 return;
1950
1951 wlist_del (&signals [w->signum - 1].head, (WL)w);
1952 ev_stop (EV_A_ (W)w);
1953
1954 if (!signals [w->signum - 1].head)
1955 signal (w->signum, SIG_DFL);
1956 }
1957
1958 void
1959 ev_child_start (EV_P_ ev_child *w)
1960 {
1961 #if EV_MULTIPLICITY
1962 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1963 #endif
1964 if (expect_false (ev_is_active (w)))
1965 return;
1966
1967 ev_start (EV_A_ (W)w, 1);
1968 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1969 }
1970
1971 void
1972 ev_child_stop (EV_P_ ev_child *w)
1973 {
1974 clear_pending (EV_A_ (W)w);
1975 if (expect_false (!ev_is_active (w)))
1976 return;
1977
1978 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1979 ev_stop (EV_A_ (W)w);
1980 }
1981
1982 #if EV_STAT_ENABLE
1983
1984 # ifdef _WIN32
1985 # undef lstat
1986 # define lstat(a,b) _stati64 (a,b)
1987 # endif
1988
1989 #define DEF_STAT_INTERVAL 5.0074891
1990 #define MIN_STAT_INTERVAL 0.1074891
1991
1992 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
1993
1994 #if EV_USE_INOTIFY
1995 # define EV_INOTIFY_BUFSIZE 8192
1996
1997 static void noinline
1998 infy_add (EV_P_ ev_stat *w)
1999 {
2000 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
2001
2002 if (w->wd < 0)
2003 {
2004 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2005
2006 /* monitor some parent directory for speedup hints */
2007 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2008 {
2009 char path [4096];
2010 strcpy (path, w->path);
2011
2012 do
2013 {
2014 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2015 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2016
2017 char *pend = strrchr (path, '/');
2018
2019 if (!pend)
2020 break; /* whoops, no '/', complain to your admin */
2021
2022 *pend = 0;
2023 w->wd = inotify_add_watch (fs_fd, path, mask);
2024 }
2025 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2026 }
2027 }
2028 else
2029 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2030
2031 if (w->wd >= 0)
2032 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2033 }
2034
2035 static void noinline
2036 infy_del (EV_P_ ev_stat *w)
2037 {
2038 int slot;
2039 int wd = w->wd;
2040
2041 if (wd < 0)
2042 return;
2043
2044 w->wd = -2;
2045 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2046 wlist_del (&fs_hash [slot].head, (WL)w);
2047
2048 /* remove this watcher, if others are watching it, they will rearm */
2049 inotify_rm_watch (fs_fd, wd);
2050 }
2051
2052 static void noinline
2053 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2054 {
2055 if (slot < 0)
2056 /* overflow, need to check for all hahs slots */
2057 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2058 infy_wd (EV_A_ slot, wd, ev);
2059 else
2060 {
2061 WL w_;
2062
2063 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2064 {
2065 ev_stat *w = (ev_stat *)w_;
2066 w_ = w_->next; /* lets us remove this watcher and all before it */
2067
2068 if (w->wd == wd || wd == -1)
2069 {
2070 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2071 {
2072 w->wd = -1;
2073 infy_add (EV_A_ w); /* re-add, no matter what */
2074 }
2075
2076 stat_timer_cb (EV_A_ &w->timer, 0);
2077 }
2078 }
2079 }
2080 }
2081
2082 static void
2083 infy_cb (EV_P_ ev_io *w, int revents)
2084 {
2085 char buf [EV_INOTIFY_BUFSIZE];
2086 struct inotify_event *ev = (struct inotify_event *)buf;
2087 int ofs;
2088 int len = read (fs_fd, buf, sizeof (buf));
2089
2090 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2091 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2092 }
2093
2094 void inline_size
2095 infy_init (EV_P)
2096 {
2097 if (fs_fd != -2)
2098 return;
2099
2100 fs_fd = inotify_init ();
2101
2102 if (fs_fd >= 0)
2103 {
2104 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2105 ev_set_priority (&fs_w, EV_MAXPRI);
2106 ev_io_start (EV_A_ &fs_w);
2107 }
2108 }
2109
2110 void inline_size
2111 infy_fork (EV_P)
2112 {
2113 int slot;
2114
2115 if (fs_fd < 0)
2116 return;
2117
2118 close (fs_fd);
2119 fs_fd = inotify_init ();
2120
2121 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2122 {
2123 WL w_ = fs_hash [slot].head;
2124 fs_hash [slot].head = 0;
2125
2126 while (w_)
2127 {
2128 ev_stat *w = (ev_stat *)w_;
2129 w_ = w_->next; /* lets us add this watcher */
2130
2131 w->wd = -1;
2132
2133 if (fs_fd >= 0)
2134 infy_add (EV_A_ w); /* re-add, no matter what */
2135 else
2136 ev_timer_start (EV_A_ &w->timer);
2137 }
2138
2139 }
2140 }
2141
2142 #endif
2143
2144 void
2145 ev_stat_stat (EV_P_ ev_stat *w)
2146 {
2147 if (lstat (w->path, &w->attr) < 0)
2148 w->attr.st_nlink = 0;
2149 else if (!w->attr.st_nlink)
2150 w->attr.st_nlink = 1;
2151 }
2152
2153 static void noinline
2154 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2155 {
2156 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2157
2158 /* we copy this here each the time so that */
2159 /* prev has the old value when the callback gets invoked */
2160 w->prev = w->attr;
2161 ev_stat_stat (EV_A_ w);
2162
2163 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2164 if (
2165 w->prev.st_dev != w->attr.st_dev
2166 || w->prev.st_ino != w->attr.st_ino
2167 || w->prev.st_mode != w->attr.st_mode
2168 || w->prev.st_nlink != w->attr.st_nlink
2169 || w->prev.st_uid != w->attr.st_uid
2170 || w->prev.st_gid != w->attr.st_gid
2171 || w->prev.st_rdev != w->attr.st_rdev
2172 || w->prev.st_size != w->attr.st_size
2173 || w->prev.st_atime != w->attr.st_atime
2174 || w->prev.st_mtime != w->attr.st_mtime
2175 || w->prev.st_ctime != w->attr.st_ctime
2176 ) {
2177 #if EV_USE_INOTIFY
2178 infy_del (EV_A_ w);
2179 infy_add (EV_A_ w);
2180 ev_stat_stat (EV_A_ w); /* avoid race... */
2181 #endif
2182
2183 ev_feed_event (EV_A_ w, EV_STAT);
2184 }
2185 }
2186
2187 void
2188 ev_stat_start (EV_P_ ev_stat *w)
2189 {
2190 if (expect_false (ev_is_active (w)))
2191 return;
2192
2193 /* since we use memcmp, we need to clear any padding data etc. */
2194 memset (&w->prev, 0, sizeof (ev_statdata));
2195 memset (&w->attr, 0, sizeof (ev_statdata));
2196
2197 ev_stat_stat (EV_A_ w);
2198
2199 if (w->interval < MIN_STAT_INTERVAL)
2200 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2201
2202 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2203 ev_set_priority (&w->timer, ev_priority (w));
2204
2205 #if EV_USE_INOTIFY
2206 infy_init (EV_A);
2207
2208 if (fs_fd >= 0)
2209 infy_add (EV_A_ w);
2210 else
2211 #endif
2212 ev_timer_start (EV_A_ &w->timer);
2213
2214 ev_start (EV_A_ (W)w, 1);
2215 }
2216
2217 void
2218 ev_stat_stop (EV_P_ ev_stat *w)
2219 {
2220 clear_pending (EV_A_ (W)w);
2221 if (expect_false (!ev_is_active (w)))
2222 return;
2223
2224 #if EV_USE_INOTIFY
2225 infy_del (EV_A_ w);
2226 #endif
2227 ev_timer_stop (EV_A_ &w->timer);
2228
2229 ev_stop (EV_A_ (W)w);
2230 }
2231 #endif
2232
2233 #if EV_IDLE_ENABLE
2234 void
2235 ev_idle_start (EV_P_ ev_idle *w)
2236 {
2237 if (expect_false (ev_is_active (w)))
2238 return;
2239
2240 pri_adjust (EV_A_ (W)w);
2241
2242 {
2243 int active = ++idlecnt [ABSPRI (w)];
2244
2245 ++idleall;
2246 ev_start (EV_A_ (W)w, active);
2247
2248 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2249 idles [ABSPRI (w)][active - 1] = w;
2250 }
2251 }
2252
2253 void
2254 ev_idle_stop (EV_P_ ev_idle *w)
2255 {
2256 clear_pending (EV_A_ (W)w);
2257 if (expect_false (!ev_is_active (w)))
2258 return;
2259
2260 {
2261 int active = ((W)w)->active;
2262
2263 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2264 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2265
2266 ev_stop (EV_A_ (W)w);
2267 --idleall;
2268 }
2269 }
2270 #endif
2271
2272 void
2273 ev_prepare_start (EV_P_ ev_prepare *w)
2274 {
2275 if (expect_false (ev_is_active (w)))
2276 return;
2277
2278 ev_start (EV_A_ (W)w, ++preparecnt);
2279 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2280 prepares [preparecnt - 1] = w;
2281 }
2282
2283 void
2284 ev_prepare_stop (EV_P_ ev_prepare *w)
2285 {
2286 clear_pending (EV_A_ (W)w);
2287 if (expect_false (!ev_is_active (w)))
2288 return;
2289
2290 {
2291 int active = ((W)w)->active;
2292 prepares [active - 1] = prepares [--preparecnt];
2293 ((W)prepares [active - 1])->active = active;
2294 }
2295
2296 ev_stop (EV_A_ (W)w);
2297 }
2298
2299 void
2300 ev_check_start (EV_P_ ev_check *w)
2301 {
2302 if (expect_false (ev_is_active (w)))
2303 return;
2304
2305 ev_start (EV_A_ (W)w, ++checkcnt);
2306 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2307 checks [checkcnt - 1] = w;
2308 }
2309
2310 void
2311 ev_check_stop (EV_P_ ev_check *w)
2312 {
2313 clear_pending (EV_A_ (W)w);
2314 if (expect_false (!ev_is_active (w)))
2315 return;
2316
2317 {
2318 int active = ((W)w)->active;
2319 checks [active - 1] = checks [--checkcnt];
2320 ((W)checks [active - 1])->active = active;
2321 }
2322
2323 ev_stop (EV_A_ (W)w);
2324 }
2325
2326 #if EV_EMBED_ENABLE
2327 void noinline
2328 ev_embed_sweep (EV_P_ ev_embed *w)
2329 {
2330 ev_loop (w->other, EVLOOP_NONBLOCK);
2331 }
2332
2333 static void
2334 embed_io_cb (EV_P_ ev_io *io, int revents)
2335 {
2336 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2337
2338 if (ev_cb (w))
2339 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2340 else
2341 ev_loop (w->other, EVLOOP_NONBLOCK);
2342 }
2343
2344 static void
2345 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2346 {
2347 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2348
2349 {
2350 struct ev_loop *loop = w->other;
2351
2352 while (fdchangecnt)
2353 {
2354 fd_reify (EV_A);
2355 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2356 }
2357 }
2358 }
2359
2360 #if 0
2361 static void
2362 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2363 {
2364 ev_idle_stop (EV_A_ idle);
2365 }
2366 #endif
2367
2368 void
2369 ev_embed_start (EV_P_ ev_embed *w)
2370 {
2371 if (expect_false (ev_is_active (w)))
2372 return;
2373
2374 {
2375 struct ev_loop *loop = w->other;
2376 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2377 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2378 }
2379
2380 ev_set_priority (&w->io, ev_priority (w));
2381 ev_io_start (EV_A_ &w->io);
2382
2383 ev_prepare_init (&w->prepare, embed_prepare_cb);
2384 ev_set_priority (&w->prepare, EV_MINPRI);
2385 ev_prepare_start (EV_A_ &w->prepare);
2386
2387 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2388
2389 ev_start (EV_A_ (W)w, 1);
2390 }
2391
2392 void
2393 ev_embed_stop (EV_P_ ev_embed *w)
2394 {
2395 clear_pending (EV_A_ (W)w);
2396 if (expect_false (!ev_is_active (w)))
2397 return;
2398
2399 ev_io_stop (EV_A_ &w->io);
2400 ev_prepare_stop (EV_A_ &w->prepare);
2401
2402 ev_stop (EV_A_ (W)w);
2403 }
2404 #endif
2405
2406 #if EV_FORK_ENABLE
2407 void
2408 ev_fork_start (EV_P_ ev_fork *w)
2409 {
2410 if (expect_false (ev_is_active (w)))
2411 return;
2412
2413 ev_start (EV_A_ (W)w, ++forkcnt);
2414 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2415 forks [forkcnt - 1] = w;
2416 }
2417
2418 void
2419 ev_fork_stop (EV_P_ ev_fork *w)
2420 {
2421 clear_pending (EV_A_ (W)w);
2422 if (expect_false (!ev_is_active (w)))
2423 return;
2424
2425 {
2426 int active = ((W)w)->active;
2427 forks [active - 1] = forks [--forkcnt];
2428 ((W)forks [active - 1])->active = active;
2429 }
2430
2431 ev_stop (EV_A_ (W)w);
2432 }
2433 #endif
2434
2435 #if EV_ASYNC_ENABLE
2436 void
2437 ev_async_start (EV_P_ ev_async *w)
2438 {
2439 if (expect_false (ev_is_active (w)))
2440 return;
2441
2442 evpipe_init (EV_A);
2443
2444 ev_start (EV_A_ (W)w, ++asynccnt);
2445 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2446 asyncs [asynccnt - 1] = w;
2447 }
2448
2449 void
2450 ev_async_stop (EV_P_ ev_async *w)
2451 {
2452 clear_pending (EV_A_ (W)w);
2453 if (expect_false (!ev_is_active (w)))
2454 return;
2455
2456 {
2457 int active = ((W)w)->active;
2458 asyncs [active - 1] = asyncs [--asynccnt];
2459 ((W)asyncs [active - 1])->active = active;
2460 }
2461
2462 ev_stop (EV_A_ (W)w);
2463 }
2464
2465 void
2466 ev_async_send (EV_P_ ev_async *w)
2467 {
2468 w->sent = 1;
2469 evpipe_write (EV_A_ 0, 1);
2470 }
2471 #endif
2472
2473 /*****************************************************************************/
2474
2475 struct ev_once
2476 {
2477 ev_io io;
2478 ev_timer to;
2479 void (*cb)(int revents, void *arg);
2480 void *arg;
2481 };
2482
2483 static void
2484 once_cb (EV_P_ struct ev_once *once, int revents)
2485 {
2486 void (*cb)(int revents, void *arg) = once->cb;
2487 void *arg = once->arg;
2488
2489 ev_io_stop (EV_A_ &once->io);
2490 ev_timer_stop (EV_A_ &once->to);
2491 ev_free (once);
2492
2493 cb (revents, arg);
2494 }
2495
2496 static void
2497 once_cb_io (EV_P_ ev_io *w, int revents)
2498 {
2499 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2500 }
2501
2502 static void
2503 once_cb_to (EV_P_ ev_timer *w, int revents)
2504 {
2505 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2506 }
2507
2508 void
2509 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2510 {
2511 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2512
2513 if (expect_false (!once))
2514 {
2515 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2516 return;
2517 }
2518
2519 once->cb = cb;
2520 once->arg = arg;
2521
2522 ev_init (&once->io, once_cb_io);
2523 if (fd >= 0)
2524 {
2525 ev_io_set (&once->io, fd, events);
2526 ev_io_start (EV_A_ &once->io);
2527 }
2528
2529 ev_init (&once->to, once_cb_to);
2530 if (timeout >= 0.)
2531 {
2532 ev_timer_set (&once->to, timeout, 0.);
2533 ev_timer_start (EV_A_ &once->to);
2534 }
2535 }
2536
2537 #if EV_MULTIPLICITY
2538 #include "ev_wrap.h"
2539 #endif
2540
2541 #ifdef __cplusplus
2542 }
2543 #endif
2544