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Revision: 1.197
Committed: Sat Dec 22 15:20:13 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: rel-2_0
Changes since 1.196: +0 -5 lines
Log Message:
*** empty log message ***

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