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Revision: 1.221
Committed: Sun Apr 6 12:44:49 2008 UTC (16 years, 3 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.220: +1 -0 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 /* this big block deduces configuration from config.h */
45 #ifndef EV_STANDALONE
46 # ifdef EV_CONFIG_H
47 # include EV_CONFIG_H
48 # else
49 # include "config.h"
50 # endif
51
52 # if HAVE_CLOCK_GETTIME
53 # ifndef EV_USE_MONOTONIC
54 # define EV_USE_MONOTONIC 1
55 # endif
56 # ifndef EV_USE_REALTIME
57 # define EV_USE_REALTIME 1
58 # endif
59 # else
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 0
62 # endif
63 # ifndef EV_USE_REALTIME
64 # define EV_USE_REALTIME 0
65 # endif
66 # endif
67
68 # ifndef EV_USE_NANOSLEEP
69 # if HAVE_NANOSLEEP
70 # define EV_USE_NANOSLEEP 1
71 # else
72 # define EV_USE_NANOSLEEP 0
73 # endif
74 # endif
75
76 # ifndef EV_USE_SELECT
77 # if HAVE_SELECT && HAVE_SYS_SELECT_H
78 # define EV_USE_SELECT 1
79 # else
80 # define EV_USE_SELECT 0
81 # endif
82 # endif
83
84 # ifndef EV_USE_POLL
85 # if HAVE_POLL && HAVE_POLL_H
86 # define EV_USE_POLL 1
87 # else
88 # define EV_USE_POLL 0
89 # endif
90 # endif
91
92 # ifndef EV_USE_EPOLL
93 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
94 # define EV_USE_EPOLL 1
95 # else
96 # define EV_USE_EPOLL 0
97 # endif
98 # endif
99
100 # ifndef EV_USE_KQUEUE
101 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
102 # define EV_USE_KQUEUE 1
103 # else
104 # define EV_USE_KQUEUE 0
105 # endif
106 # endif
107
108 # ifndef EV_USE_PORT
109 # if HAVE_PORT_H && HAVE_PORT_CREATE
110 # define EV_USE_PORT 1
111 # else
112 # define EV_USE_PORT 0
113 # endif
114 # endif
115
116 # ifndef EV_USE_INOTIFY
117 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
118 # define EV_USE_INOTIFY 1
119 # else
120 # define EV_USE_INOTIFY 0
121 # endif
122 # endif
123
124 # ifndef EV_USE_EVENTFD
125 # if HAVE_EVENTFD
126 # define EV_USE_EVENTFD 1
127 # else
128 # define EV_USE_EVENTFD 0
129 # endif
130 # endif
131
132 #endif
133
134 #include <math.h>
135 #include <stdlib.h>
136 #include <fcntl.h>
137 #include <stddef.h>
138
139 #include <stdio.h>
140
141 #include <assert.h>
142 #include <errno.h>
143 #include <sys/types.h>
144 #include <time.h>
145
146 #include <signal.h>
147
148 #ifdef EV_H
149 # include EV_H
150 #else
151 # include "ev.h"
152 #endif
153
154 #ifndef _WIN32
155 # include <sys/time.h>
156 # include <sys/wait.h>
157 # include <unistd.h>
158 #else
159 # define WIN32_LEAN_AND_MEAN
160 # include <windows.h>
161 # ifndef EV_SELECT_IS_WINSOCKET
162 # define EV_SELECT_IS_WINSOCKET 1
163 # endif
164 #endif
165
166 /* this block tries to deduce configuration from header-defined symbols and defaults */
167
168 #ifndef EV_USE_MONOTONIC
169 # define EV_USE_MONOTONIC 0
170 #endif
171
172 #ifndef EV_USE_REALTIME
173 # define EV_USE_REALTIME 0
174 #endif
175
176 #ifndef EV_USE_NANOSLEEP
177 # define EV_USE_NANOSLEEP 0
178 #endif
179
180 #ifndef EV_USE_SELECT
181 # define EV_USE_SELECT 1
182 #endif
183
184 #ifndef EV_USE_POLL
185 # ifdef _WIN32
186 # define EV_USE_POLL 0
187 # else
188 # define EV_USE_POLL 1
189 # endif
190 #endif
191
192 #ifndef EV_USE_EPOLL
193 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
194 # define EV_USE_EPOLL 1
195 # else
196 # define EV_USE_EPOLL 0
197 # endif
198 #endif
199
200 #ifndef EV_USE_KQUEUE
201 # define EV_USE_KQUEUE 0
202 #endif
203
204 #ifndef EV_USE_PORT
205 # define EV_USE_PORT 0
206 #endif
207
208 #ifndef EV_USE_INOTIFY
209 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
210 # define EV_USE_INOTIFY 1
211 # else
212 # define EV_USE_INOTIFY 0
213 # endif
214 #endif
215
216 #ifndef EV_PID_HASHSIZE
217 # if EV_MINIMAL
218 # define EV_PID_HASHSIZE 1
219 # else
220 # define EV_PID_HASHSIZE 16
221 # endif
222 #endif
223
224 #ifndef EV_INOTIFY_HASHSIZE
225 # if EV_MINIMAL
226 # define EV_INOTIFY_HASHSIZE 1
227 # else
228 # define EV_INOTIFY_HASHSIZE 16
229 # endif
230 #endif
231
232 #ifndef EV_USE_EVENTFD
233 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
234 # define EV_USE_EVENTFD 1
235 # else
236 # define EV_USE_EVENTFD 0
237 # endif
238 #endif
239
240 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
241
242 #ifndef CLOCK_MONOTONIC
243 # undef EV_USE_MONOTONIC
244 # define EV_USE_MONOTONIC 0
245 #endif
246
247 #ifndef CLOCK_REALTIME
248 # undef EV_USE_REALTIME
249 # define EV_USE_REALTIME 0
250 #endif
251
252 #if !EV_STAT_ENABLE
253 # undef EV_USE_INOTIFY
254 # define EV_USE_INOTIFY 0
255 #endif
256
257 #if !EV_USE_NANOSLEEP
258 # ifndef _WIN32
259 # include <sys/select.h>
260 # endif
261 #endif
262
263 #if EV_USE_INOTIFY
264 # include <sys/inotify.h>
265 #endif
266
267 #if EV_SELECT_IS_WINSOCKET
268 # include <winsock.h>
269 #endif
270
271 #if EV_USE_EVENTFD
272 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
273 # include <stdint.h>
274 int eventfd (unsigned int initval, int flags);
275 #endif
276
277 /**/
278
279 /*
280 * This is used to avoid floating point rounding problems.
281 * It is added to ev_rt_now when scheduling periodics
282 * to ensure progress, time-wise, even when rounding
283 * errors are against us.
284 * This value is good at least till the year 4000.
285 * Better solutions welcome.
286 */
287 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
288
289 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
290 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
291 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
292
293 #if __GNUC__ >= 4
294 # define expect(expr,value) __builtin_expect ((expr),(value))
295 # define noinline __attribute__ ((noinline))
296 #else
297 # define expect(expr,value) (expr)
298 # define noinline
299 # if __STDC_VERSION__ < 199901L
300 # define inline
301 # endif
302 #endif
303
304 #define expect_false(expr) expect ((expr) != 0, 0)
305 #define expect_true(expr) expect ((expr) != 0, 1)
306 #define inline_size static inline
307
308 #if EV_MINIMAL
309 # define inline_speed static noinline
310 #else
311 # define inline_speed static inline
312 #endif
313
314 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
315 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
316
317 #define EMPTY /* required for microsofts broken pseudo-c compiler */
318 #define EMPTY2(a,b) /* used to suppress some warnings */
319
320 typedef ev_watcher *W;
321 typedef ev_watcher_list *WL;
322 typedef ev_watcher_time *WT;
323
324 #if EV_USE_MONOTONIC
325 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
326 /* giving it a reasonably high chance of working on typical architetcures */
327 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
328 #endif
329
330 #ifdef _WIN32
331 # include "ev_win32.c"
332 #endif
333
334 /*****************************************************************************/
335
336 static void (*syserr_cb)(const char *msg);
337
338 void
339 ev_set_syserr_cb (void (*cb)(const char *msg))
340 {
341 syserr_cb = cb;
342 }
343
344 static void noinline
345 syserr (const char *msg)
346 {
347 if (!msg)
348 msg = "(libev) system error";
349
350 if (syserr_cb)
351 syserr_cb (msg);
352 else
353 {
354 perror (msg);
355 abort ();
356 }
357 }
358
359 static void *(*alloc)(void *ptr, long size);
360
361 void
362 ev_set_allocator (void *(*cb)(void *ptr, long size))
363 {
364 alloc = cb;
365 }
366
367 inline_speed void *
368 ev_realloc (void *ptr, long size)
369 {
370 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
371
372 if (!ptr && size)
373 {
374 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
375 abort ();
376 }
377
378 return ptr;
379 }
380
381 #define ev_malloc(size) ev_realloc (0, (size))
382 #define ev_free(ptr) ev_realloc ((ptr), 0)
383
384 /*****************************************************************************/
385
386 typedef struct
387 {
388 WL head;
389 unsigned char events;
390 unsigned char reify;
391 #if EV_SELECT_IS_WINSOCKET
392 SOCKET handle;
393 #endif
394 } ANFD;
395
396 typedef struct
397 {
398 W w;
399 int events;
400 } ANPENDING;
401
402 #if EV_USE_INOTIFY
403 typedef struct
404 {
405 WL head;
406 } ANFS;
407 #endif
408
409 #if EV_MULTIPLICITY
410
411 struct ev_loop
412 {
413 ev_tstamp ev_rt_now;
414 #define ev_rt_now ((loop)->ev_rt_now)
415 #define VAR(name,decl) decl;
416 #include "ev_vars.h"
417 #undef VAR
418 };
419 #include "ev_wrap.h"
420
421 static struct ev_loop default_loop_struct;
422 struct ev_loop *ev_default_loop_ptr;
423
424 #else
425
426 ev_tstamp ev_rt_now;
427 #define VAR(name,decl) static decl;
428 #include "ev_vars.h"
429 #undef VAR
430
431 static int ev_default_loop_ptr;
432
433 #endif
434
435 /*****************************************************************************/
436
437 ev_tstamp
438 ev_time (void)
439 {
440 #if EV_USE_REALTIME
441 struct timespec ts;
442 clock_gettime (CLOCK_REALTIME, &ts);
443 return ts.tv_sec + ts.tv_nsec * 1e-9;
444 #else
445 struct timeval tv;
446 gettimeofday (&tv, 0);
447 return tv.tv_sec + tv.tv_usec * 1e-6;
448 #endif
449 }
450
451 ev_tstamp inline_size
452 get_clock (void)
453 {
454 #if EV_USE_MONOTONIC
455 if (expect_true (have_monotonic))
456 {
457 struct timespec ts;
458 clock_gettime (CLOCK_MONOTONIC, &ts);
459 return ts.tv_sec + ts.tv_nsec * 1e-9;
460 }
461 #endif
462
463 return ev_time ();
464 }
465
466 #if EV_MULTIPLICITY
467 ev_tstamp
468 ev_now (EV_P)
469 {
470 return ev_rt_now;
471 }
472 #endif
473
474 void
475 ev_sleep (ev_tstamp delay)
476 {
477 if (delay > 0.)
478 {
479 #if EV_USE_NANOSLEEP
480 struct timespec ts;
481
482 ts.tv_sec = (time_t)delay;
483 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
484
485 nanosleep (&ts, 0);
486 #elif defined(_WIN32)
487 Sleep ((unsigned long)(delay * 1e3));
488 #else
489 struct timeval tv;
490
491 tv.tv_sec = (time_t)delay;
492 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
493
494 select (0, 0, 0, 0, &tv);
495 #endif
496 }
497 }
498
499 /*****************************************************************************/
500
501 int inline_size
502 array_nextsize (int elem, int cur, int cnt)
503 {
504 int ncur = cur + 1;
505
506 do
507 ncur <<= 1;
508 while (cnt > ncur);
509
510 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
511 if (elem * ncur > 4096)
512 {
513 ncur *= elem;
514 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
515 ncur = ncur - sizeof (void *) * 4;
516 ncur /= elem;
517 }
518
519 return ncur;
520 }
521
522 static noinline void *
523 array_realloc (int elem, void *base, int *cur, int cnt)
524 {
525 *cur = array_nextsize (elem, *cur, cnt);
526 return ev_realloc (base, elem * *cur);
527 }
528
529 #define array_needsize(type,base,cur,cnt,init) \
530 if (expect_false ((cnt) > (cur))) \
531 { \
532 int ocur_ = (cur); \
533 (base) = (type *)array_realloc \
534 (sizeof (type), (base), &(cur), (cnt)); \
535 init ((base) + (ocur_), (cur) - ocur_); \
536 }
537
538 #if 0
539 #define array_slim(type,stem) \
540 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
541 { \
542 stem ## max = array_roundsize (stem ## cnt >> 1); \
543 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
544 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
545 }
546 #endif
547
548 #define array_free(stem, idx) \
549 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
550
551 /*****************************************************************************/
552
553 void noinline
554 ev_feed_event (EV_P_ void *w, int revents)
555 {
556 W w_ = (W)w;
557 int pri = ABSPRI (w_);
558
559 if (expect_false (w_->pending))
560 pendings [pri][w_->pending - 1].events |= revents;
561 else
562 {
563 w_->pending = ++pendingcnt [pri];
564 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
565 pendings [pri][w_->pending - 1].w = w_;
566 pendings [pri][w_->pending - 1].events = revents;
567 }
568 }
569
570 void inline_speed
571 queue_events (EV_P_ W *events, int eventcnt, int type)
572 {
573 int i;
574
575 for (i = 0; i < eventcnt; ++i)
576 ev_feed_event (EV_A_ events [i], type);
577 }
578
579 /*****************************************************************************/
580
581 void inline_size
582 anfds_init (ANFD *base, int count)
583 {
584 while (count--)
585 {
586 base->head = 0;
587 base->events = EV_NONE;
588 base->reify = 0;
589
590 ++base;
591 }
592 }
593
594 void inline_speed
595 fd_event (EV_P_ int fd, int revents)
596 {
597 ANFD *anfd = anfds + fd;
598 ev_io *w;
599
600 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
601 {
602 int ev = w->events & revents;
603
604 if (ev)
605 ev_feed_event (EV_A_ (W)w, ev);
606 }
607 }
608
609 void
610 ev_feed_fd_event (EV_P_ int fd, int revents)
611 {
612 if (fd >= 0 && fd < anfdmax)
613 fd_event (EV_A_ fd, revents);
614 }
615
616 void inline_size
617 fd_reify (EV_P)
618 {
619 int i;
620
621 for (i = 0; i < fdchangecnt; ++i)
622 {
623 int fd = fdchanges [i];
624 ANFD *anfd = anfds + fd;
625 ev_io *w;
626
627 unsigned char events = 0;
628
629 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
630 events |= (unsigned char)w->events;
631
632 #if EV_SELECT_IS_WINSOCKET
633 if (events)
634 {
635 unsigned long argp;
636 #ifdef EV_FD_TO_WIN32_HANDLE
637 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
638 #else
639 anfd->handle = _get_osfhandle (fd);
640 #endif
641 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
642 }
643 #endif
644
645 {
646 unsigned char o_events = anfd->events;
647 unsigned char o_reify = anfd->reify;
648
649 anfd->reify = 0;
650 anfd->events = events;
651
652 if (o_events != events || o_reify & EV_IOFDSET)
653 backend_modify (EV_A_ fd, o_events, events);
654 }
655 }
656
657 fdchangecnt = 0;
658 }
659
660 void inline_size
661 fd_change (EV_P_ int fd, int flags)
662 {
663 unsigned char reify = anfds [fd].reify;
664 anfds [fd].reify |= flags;
665
666 if (expect_true (!reify))
667 {
668 ++fdchangecnt;
669 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
670 fdchanges [fdchangecnt - 1] = fd;
671 }
672 }
673
674 void inline_speed
675 fd_kill (EV_P_ int fd)
676 {
677 ev_io *w;
678
679 while ((w = (ev_io *)anfds [fd].head))
680 {
681 ev_io_stop (EV_A_ w);
682 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
683 }
684 }
685
686 int inline_size
687 fd_valid (int fd)
688 {
689 #ifdef _WIN32
690 return _get_osfhandle (fd) != -1;
691 #else
692 return fcntl (fd, F_GETFD) != -1;
693 #endif
694 }
695
696 /* called on EBADF to verify fds */
697 static void noinline
698 fd_ebadf (EV_P)
699 {
700 int fd;
701
702 for (fd = 0; fd < anfdmax; ++fd)
703 if (anfds [fd].events)
704 if (!fd_valid (fd) == -1 && errno == EBADF)
705 fd_kill (EV_A_ fd);
706 }
707
708 /* called on ENOMEM in select/poll to kill some fds and retry */
709 static void noinline
710 fd_enomem (EV_P)
711 {
712 int fd;
713
714 for (fd = anfdmax; fd--; )
715 if (anfds [fd].events)
716 {
717 fd_kill (EV_A_ fd);
718 return;
719 }
720 }
721
722 /* usually called after fork if backend needs to re-arm all fds from scratch */
723 static void noinline
724 fd_rearm_all (EV_P)
725 {
726 int fd;
727
728 for (fd = 0; fd < anfdmax; ++fd)
729 if (anfds [fd].events)
730 {
731 anfds [fd].events = 0;
732 fd_change (EV_A_ fd, EV_IOFDSET | 1);
733 }
734 }
735
736 /*****************************************************************************/
737
738 void inline_speed
739 upheap (WT *heap, int k)
740 {
741 WT w = heap [k];
742
743 while (k)
744 {
745 int p = (k - 1) >> 1;
746
747 if (heap [p]->at <= w->at)
748 break;
749
750 heap [k] = heap [p];
751 ((W)heap [k])->active = k + 1;
752 k = p;
753 }
754
755 heap [k] = w;
756 ((W)heap [k])->active = k + 1;
757 }
758
759 void inline_speed
760 downheap (WT *heap, int N, int k)
761 {
762 WT w = heap [k];
763
764 for (;;)
765 {
766 int c = (k << 1) + 1;
767
768 if (c >= N)
769 break;
770
771 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
772 ? 1 : 0;
773
774 if (w->at <= heap [c]->at)
775 break;
776
777 heap [k] = heap [c];
778 ((W)heap [k])->active = k + 1;
779
780 k = c;
781 }
782
783 heap [k] = w;
784 ((W)heap [k])->active = k + 1;
785 }
786
787 void inline_size
788 adjustheap (WT *heap, int N, int k)
789 {
790 upheap (heap, k);
791 downheap (heap, N, k);
792 }
793
794 /*****************************************************************************/
795
796 typedef struct
797 {
798 WL head;
799 EV_ATOMIC_T gotsig;
800 } ANSIG;
801
802 static ANSIG *signals;
803 static int signalmax;
804
805 static EV_ATOMIC_T gotsig;
806
807 void inline_size
808 signals_init (ANSIG *base, int count)
809 {
810 while (count--)
811 {
812 base->head = 0;
813 base->gotsig = 0;
814
815 ++base;
816 }
817 }
818
819 /*****************************************************************************/
820
821 void inline_speed
822 fd_intern (int fd)
823 {
824 #ifdef _WIN32
825 int arg = 1;
826 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
827 #else
828 fcntl (fd, F_SETFD, FD_CLOEXEC);
829 fcntl (fd, F_SETFL, O_NONBLOCK);
830 #endif
831 }
832
833 static void noinline
834 evpipe_init (EV_P)
835 {
836 if (!ev_is_active (&pipeev))
837 {
838 #if EV_USE_EVENTFD
839 if ((evfd = eventfd (0, 0)) >= 0)
840 {
841 evpipe [0] = -1;
842 fd_intern (evfd);
843 ev_io_set (&pipeev, evfd, EV_READ);
844 }
845 else
846 #endif
847 {
848 while (pipe (evpipe))
849 syserr ("(libev) error creating signal/async pipe");
850
851 fd_intern (evpipe [0]);
852 fd_intern (evpipe [1]);
853 ev_io_set (&pipeev, evpipe [0], EV_READ);
854 }
855
856 ev_io_start (EV_A_ &pipeev);
857 ev_unref (EV_A); /* watcher should not keep loop alive */
858 }
859 }
860
861 void inline_size
862 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
863 {
864 if (!*flag)
865 {
866 int old_errno = errno; /* save errno because write might clobber it */
867
868 *flag = 1;
869
870 #if EV_USE_EVENTFD
871 if (evfd >= 0)
872 {
873 uint64_t counter = 1;
874 write (evfd, &counter, sizeof (uint64_t));
875 }
876 else
877 #endif
878 write (evpipe [1], &old_errno, 1);
879
880 errno = old_errno;
881 }
882 }
883
884 static void
885 pipecb (EV_P_ ev_io *iow, int revents)
886 {
887 #if EV_USE_EVENTFD
888 if (evfd >= 0)
889 {
890 uint64_t counter = 1;
891 read (evfd, &counter, sizeof (uint64_t));
892 }
893 else
894 #endif
895 {
896 char dummy;
897 read (evpipe [0], &dummy, 1);
898 }
899
900 if (gotsig && ev_is_default_loop (EV_A))
901 {
902 int signum;
903 gotsig = 0;
904
905 for (signum = signalmax; signum--; )
906 if (signals [signum].gotsig)
907 ev_feed_signal_event (EV_A_ signum + 1);
908 }
909
910 #if EV_ASYNC_ENABLE
911 if (gotasync)
912 {
913 int i;
914 gotasync = 0;
915
916 for (i = asynccnt; i--; )
917 if (asyncs [i]->sent)
918 {
919 asyncs [i]->sent = 0;
920 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
921 }
922 }
923 #endif
924 }
925
926 /*****************************************************************************/
927
928 static void
929 ev_sighandler (int signum)
930 {
931 #if EV_MULTIPLICITY
932 struct ev_loop *loop = &default_loop_struct;
933 #endif
934
935 #if _WIN32
936 signal (signum, ev_sighandler);
937 #endif
938
939 signals [signum - 1].gotsig = 1;
940 evpipe_write (EV_A_ &gotsig);
941 }
942
943 void noinline
944 ev_feed_signal_event (EV_P_ int signum)
945 {
946 WL w;
947
948 #if EV_MULTIPLICITY
949 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
950 #endif
951
952 --signum;
953
954 if (signum < 0 || signum >= signalmax)
955 return;
956
957 signals [signum].gotsig = 0;
958
959 for (w = signals [signum].head; w; w = w->next)
960 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
961 }
962
963 /*****************************************************************************/
964
965 static WL childs [EV_PID_HASHSIZE];
966
967 #ifndef _WIN32
968
969 static ev_signal childev;
970
971 #ifndef WIFCONTINUED
972 # define WIFCONTINUED(status) 0
973 #endif
974
975 void inline_speed
976 child_reap (EV_P_ int chain, int pid, int status)
977 {
978 ev_child *w;
979 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
980
981 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
982 {
983 if ((w->pid == pid || !w->pid)
984 && (!traced || (w->flags & 1)))
985 {
986 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
987 w->rpid = pid;
988 w->rstatus = status;
989 ev_feed_event (EV_A_ (W)w, EV_CHILD);
990 }
991 }
992 }
993
994 #ifndef WCONTINUED
995 # define WCONTINUED 0
996 #endif
997
998 static void
999 childcb (EV_P_ ev_signal *sw, int revents)
1000 {
1001 int pid, status;
1002
1003 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1004 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1005 if (!WCONTINUED
1006 || errno != EINVAL
1007 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1008 return;
1009
1010 /* make sure we are called again until all children have been reaped */
1011 /* we need to do it this way so that the callback gets called before we continue */
1012 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1013
1014 child_reap (EV_A_ pid, pid, status);
1015 if (EV_PID_HASHSIZE > 1)
1016 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1017 }
1018
1019 #endif
1020
1021 /*****************************************************************************/
1022
1023 #if EV_USE_PORT
1024 # include "ev_port.c"
1025 #endif
1026 #if EV_USE_KQUEUE
1027 # include "ev_kqueue.c"
1028 #endif
1029 #if EV_USE_EPOLL
1030 # include "ev_epoll.c"
1031 #endif
1032 #if EV_USE_POLL
1033 # include "ev_poll.c"
1034 #endif
1035 #if EV_USE_SELECT
1036 # include "ev_select.c"
1037 #endif
1038
1039 int
1040 ev_version_major (void)
1041 {
1042 return EV_VERSION_MAJOR;
1043 }
1044
1045 int
1046 ev_version_minor (void)
1047 {
1048 return EV_VERSION_MINOR;
1049 }
1050
1051 /* return true if we are running with elevated privileges and should ignore env variables */
1052 int inline_size
1053 enable_secure (void)
1054 {
1055 #ifdef _WIN32
1056 return 0;
1057 #else
1058 return getuid () != geteuid ()
1059 || getgid () != getegid ();
1060 #endif
1061 }
1062
1063 unsigned int
1064 ev_supported_backends (void)
1065 {
1066 unsigned int flags = 0;
1067
1068 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1069 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1070 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1071 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1072 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1073
1074 return flags;
1075 }
1076
1077 unsigned int
1078 ev_recommended_backends (void)
1079 {
1080 unsigned int flags = ev_supported_backends ();
1081
1082 #ifndef __NetBSD__
1083 /* kqueue is borked on everything but netbsd apparently */
1084 /* it usually doesn't work correctly on anything but sockets and pipes */
1085 flags &= ~EVBACKEND_KQUEUE;
1086 #endif
1087 #ifdef __APPLE__
1088 // flags &= ~EVBACKEND_KQUEUE; for documentation
1089 flags &= ~EVBACKEND_POLL;
1090 #endif
1091
1092 return flags;
1093 }
1094
1095 unsigned int
1096 ev_embeddable_backends (void)
1097 {
1098 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1099
1100 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1101 /* please fix it and tell me how to detect the fix */
1102 flags &= ~EVBACKEND_EPOLL;
1103
1104 return flags;
1105 }
1106
1107 unsigned int
1108 ev_backend (EV_P)
1109 {
1110 return backend;
1111 }
1112
1113 unsigned int
1114 ev_loop_count (EV_P)
1115 {
1116 return loop_count;
1117 }
1118
1119 void
1120 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1121 {
1122 io_blocktime = interval;
1123 }
1124
1125 void
1126 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1127 {
1128 timeout_blocktime = interval;
1129 }
1130
1131 static void noinline
1132 loop_init (EV_P_ unsigned int flags)
1133 {
1134 if (!backend)
1135 {
1136 #if EV_USE_MONOTONIC
1137 {
1138 struct timespec ts;
1139 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1140 have_monotonic = 1;
1141 }
1142 #endif
1143
1144 ev_rt_now = ev_time ();
1145 mn_now = get_clock ();
1146 now_floor = mn_now;
1147 rtmn_diff = ev_rt_now - mn_now;
1148
1149 io_blocktime = 0.;
1150 timeout_blocktime = 0.;
1151 backend = 0;
1152 backend_fd = -1;
1153 gotasync = 0;
1154 #if EV_USE_INOTIFY
1155 fs_fd = -2;
1156 #endif
1157
1158 /* pid check not overridable via env */
1159 #ifndef _WIN32
1160 if (flags & EVFLAG_FORKCHECK)
1161 curpid = getpid ();
1162 #endif
1163
1164 if (!(flags & EVFLAG_NOENV)
1165 && !enable_secure ()
1166 && getenv ("LIBEV_FLAGS"))
1167 flags = atoi (getenv ("LIBEV_FLAGS"));
1168
1169 if (!(flags & 0x0000ffffUL))
1170 flags |= ev_recommended_backends ();
1171
1172 #if EV_USE_PORT
1173 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1174 #endif
1175 #if EV_USE_KQUEUE
1176 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1177 #endif
1178 #if EV_USE_EPOLL
1179 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1180 #endif
1181 #if EV_USE_POLL
1182 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1183 #endif
1184 #if EV_USE_SELECT
1185 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1186 #endif
1187
1188 ev_init (&pipeev, pipecb);
1189 ev_set_priority (&pipeev, EV_MAXPRI);
1190 }
1191 }
1192
1193 static void noinline
1194 loop_destroy (EV_P)
1195 {
1196 int i;
1197
1198 if (ev_is_active (&pipeev))
1199 {
1200 ev_ref (EV_A); /* signal watcher */
1201 ev_io_stop (EV_A_ &pipeev);
1202
1203 #if EV_USE_EVENTFD
1204 if (evfd >= 0)
1205 close (evfd);
1206 #endif
1207
1208 if (evpipe [0] >= 0)
1209 {
1210 close (evpipe [0]);
1211 close (evpipe [1]);
1212 }
1213 }
1214
1215 #if EV_USE_INOTIFY
1216 if (fs_fd >= 0)
1217 close (fs_fd);
1218 #endif
1219
1220 if (backend_fd >= 0)
1221 close (backend_fd);
1222
1223 #if EV_USE_PORT
1224 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1225 #endif
1226 #if EV_USE_KQUEUE
1227 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1228 #endif
1229 #if EV_USE_EPOLL
1230 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1231 #endif
1232 #if EV_USE_POLL
1233 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1234 #endif
1235 #if EV_USE_SELECT
1236 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1237 #endif
1238
1239 for (i = NUMPRI; i--; )
1240 {
1241 array_free (pending, [i]);
1242 #if EV_IDLE_ENABLE
1243 array_free (idle, [i]);
1244 #endif
1245 }
1246
1247 ev_free (anfds); anfdmax = 0;
1248
1249 /* have to use the microsoft-never-gets-it-right macro */
1250 array_free (fdchange, EMPTY);
1251 array_free (timer, EMPTY);
1252 #if EV_PERIODIC_ENABLE
1253 array_free (periodic, EMPTY);
1254 #endif
1255 #if EV_FORK_ENABLE
1256 array_free (fork, EMPTY);
1257 #endif
1258 array_free (prepare, EMPTY);
1259 array_free (check, EMPTY);
1260 #if EV_ASYNC_ENABLE
1261 array_free (async, EMPTY);
1262 #endif
1263
1264 backend = 0;
1265 }
1266
1267 void inline_size infy_fork (EV_P);
1268
1269 void inline_size
1270 loop_fork (EV_P)
1271 {
1272 #if EV_USE_PORT
1273 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1274 #endif
1275 #if EV_USE_KQUEUE
1276 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1277 #endif
1278 #if EV_USE_EPOLL
1279 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1280 #endif
1281 #if EV_USE_INOTIFY
1282 infy_fork (EV_A);
1283 #endif
1284
1285 if (ev_is_active (&pipeev))
1286 {
1287 /* this "locks" the handlers against writing to the pipe */
1288 /* while we modify the fd vars */
1289 gotsig = 1;
1290 #if EV_ASYNC_ENABLE
1291 gotasync = 1;
1292 #endif
1293
1294 ev_ref (EV_A);
1295 ev_io_stop (EV_A_ &pipeev);
1296
1297 #if EV_USE_EVENTFD
1298 if (evfd >= 0)
1299 close (evfd);
1300 #endif
1301
1302 if (evpipe [0] >= 0)
1303 {
1304 close (evpipe [0]);
1305 close (evpipe [1]);
1306 }
1307
1308 evpipe_init (EV_A);
1309 /* now iterate over everything, in case we missed something */
1310 pipecb (EV_A_ &pipeev, EV_READ);
1311 }
1312
1313 postfork = 0;
1314 }
1315
1316 #if EV_MULTIPLICITY
1317 struct ev_loop *
1318 ev_loop_new (unsigned int flags)
1319 {
1320 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1321
1322 memset (loop, 0, sizeof (struct ev_loop));
1323
1324 loop_init (EV_A_ flags);
1325
1326 if (ev_backend (EV_A))
1327 return loop;
1328
1329 return 0;
1330 }
1331
1332 void
1333 ev_loop_destroy (EV_P)
1334 {
1335 loop_destroy (EV_A);
1336 ev_free (loop);
1337 }
1338
1339 void
1340 ev_loop_fork (EV_P)
1341 {
1342 postfork = 1; /* must be in line with ev_default_fork */
1343 }
1344
1345 #endif
1346
1347 #if EV_MULTIPLICITY
1348 struct ev_loop *
1349 ev_default_loop_init (unsigned int flags)
1350 #else
1351 int
1352 ev_default_loop (unsigned int flags)
1353 #endif
1354 {
1355 if (!ev_default_loop_ptr)
1356 {
1357 #if EV_MULTIPLICITY
1358 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1359 #else
1360 ev_default_loop_ptr = 1;
1361 #endif
1362
1363 loop_init (EV_A_ flags);
1364
1365 if (ev_backend (EV_A))
1366 {
1367 #ifndef _WIN32
1368 ev_signal_init (&childev, childcb, SIGCHLD);
1369 ev_set_priority (&childev, EV_MAXPRI);
1370 ev_signal_start (EV_A_ &childev);
1371 ev_unref (EV_A); /* child watcher should not keep loop alive */
1372 #endif
1373 }
1374 else
1375 ev_default_loop_ptr = 0;
1376 }
1377
1378 return ev_default_loop_ptr;
1379 }
1380
1381 void
1382 ev_default_destroy (void)
1383 {
1384 #if EV_MULTIPLICITY
1385 struct ev_loop *loop = ev_default_loop_ptr;
1386 #endif
1387
1388 #ifndef _WIN32
1389 ev_ref (EV_A); /* child watcher */
1390 ev_signal_stop (EV_A_ &childev);
1391 #endif
1392
1393 loop_destroy (EV_A);
1394 }
1395
1396 void
1397 ev_default_fork (void)
1398 {
1399 #if EV_MULTIPLICITY
1400 struct ev_loop *loop = ev_default_loop_ptr;
1401 #endif
1402
1403 if (backend)
1404 postfork = 1; /* must be in line with ev_loop_fork */
1405 }
1406
1407 /*****************************************************************************/
1408
1409 void
1410 ev_invoke (EV_P_ void *w, int revents)
1411 {
1412 EV_CB_INVOKE ((W)w, revents);
1413 }
1414
1415 void inline_speed
1416 call_pending (EV_P)
1417 {
1418 int pri;
1419
1420 for (pri = NUMPRI; pri--; )
1421 while (pendingcnt [pri])
1422 {
1423 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1424
1425 if (expect_true (p->w))
1426 {
1427 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1428
1429 p->w->pending = 0;
1430 EV_CB_INVOKE (p->w, p->events);
1431 }
1432 }
1433 }
1434
1435 void inline_size
1436 timers_reify (EV_P)
1437 {
1438 while (timercnt && ((WT)timers [0])->at <= mn_now)
1439 {
1440 ev_timer *w = (ev_timer *)timers [0];
1441
1442 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1443
1444 /* first reschedule or stop timer */
1445 if (w->repeat)
1446 {
1447 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1448
1449 ((WT)w)->at += w->repeat;
1450 if (((WT)w)->at < mn_now)
1451 ((WT)w)->at = mn_now;
1452
1453 downheap (timers, timercnt, 0);
1454 }
1455 else
1456 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1457
1458 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1459 }
1460 }
1461
1462 #if EV_PERIODIC_ENABLE
1463 void inline_size
1464 periodics_reify (EV_P)
1465 {
1466 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1467 {
1468 ev_periodic *w = (ev_periodic *)periodics [0];
1469
1470 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1471
1472 /* first reschedule or stop timer */
1473 if (w->reschedule_cb)
1474 {
1475 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1476 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1477 downheap (periodics, periodiccnt, 0);
1478 }
1479 else if (w->interval)
1480 {
1481 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1482 if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
1483 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1484 downheap (periodics, periodiccnt, 0);
1485 }
1486 else
1487 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1488
1489 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1490 }
1491 }
1492
1493 static void noinline
1494 periodics_reschedule (EV_P)
1495 {
1496 int i;
1497
1498 /* adjust periodics after time jump */
1499 for (i = 0; i < periodiccnt; ++i)
1500 {
1501 ev_periodic *w = (ev_periodic *)periodics [i];
1502
1503 if (w->reschedule_cb)
1504 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1505 else if (w->interval)
1506 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1507 }
1508
1509 /* now rebuild the heap */
1510 for (i = periodiccnt >> 1; i--; )
1511 downheap (periodics, periodiccnt, i);
1512 }
1513 #endif
1514
1515 #if EV_IDLE_ENABLE
1516 void inline_size
1517 idle_reify (EV_P)
1518 {
1519 if (expect_false (idleall))
1520 {
1521 int pri;
1522
1523 for (pri = NUMPRI; pri--; )
1524 {
1525 if (pendingcnt [pri])
1526 break;
1527
1528 if (idlecnt [pri])
1529 {
1530 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1531 break;
1532 }
1533 }
1534 }
1535 }
1536 #endif
1537
1538 void inline_speed
1539 time_update (EV_P_ ev_tstamp max_block)
1540 {
1541 int i;
1542
1543 #if EV_USE_MONOTONIC
1544 if (expect_true (have_monotonic))
1545 {
1546 ev_tstamp odiff = rtmn_diff;
1547
1548 mn_now = get_clock ();
1549
1550 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1551 /* interpolate in the meantime */
1552 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1553 {
1554 ev_rt_now = rtmn_diff + mn_now;
1555 return;
1556 }
1557
1558 now_floor = mn_now;
1559 ev_rt_now = ev_time ();
1560
1561 /* loop a few times, before making important decisions.
1562 * on the choice of "4": one iteration isn't enough,
1563 * in case we get preempted during the calls to
1564 * ev_time and get_clock. a second call is almost guaranteed
1565 * to succeed in that case, though. and looping a few more times
1566 * doesn't hurt either as we only do this on time-jumps or
1567 * in the unlikely event of having been preempted here.
1568 */
1569 for (i = 4; --i; )
1570 {
1571 rtmn_diff = ev_rt_now - mn_now;
1572
1573 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1574 return; /* all is well */
1575
1576 ev_rt_now = ev_time ();
1577 mn_now = get_clock ();
1578 now_floor = mn_now;
1579 }
1580
1581 # if EV_PERIODIC_ENABLE
1582 periodics_reschedule (EV_A);
1583 # endif
1584 /* no timer adjustment, as the monotonic clock doesn't jump */
1585 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1586 }
1587 else
1588 #endif
1589 {
1590 ev_rt_now = ev_time ();
1591
1592 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1593 {
1594 #if EV_PERIODIC_ENABLE
1595 periodics_reschedule (EV_A);
1596 #endif
1597 /* adjust timers. this is easy, as the offset is the same for all of them */
1598 for (i = 0; i < timercnt; ++i)
1599 ((WT)timers [i])->at += ev_rt_now - mn_now;
1600 }
1601
1602 mn_now = ev_rt_now;
1603 }
1604 }
1605
1606 void
1607 ev_ref (EV_P)
1608 {
1609 ++activecnt;
1610 }
1611
1612 void
1613 ev_unref (EV_P)
1614 {
1615 --activecnt;
1616 }
1617
1618 static int loop_done;
1619
1620 void
1621 ev_loop (EV_P_ int flags)
1622 {
1623 loop_done = EVUNLOOP_CANCEL;
1624
1625 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1626
1627 do
1628 {
1629 #ifndef _WIN32
1630 if (expect_false (curpid)) /* penalise the forking check even more */
1631 if (expect_false (getpid () != curpid))
1632 {
1633 curpid = getpid ();
1634 postfork = 1;
1635 }
1636 #endif
1637
1638 #if EV_FORK_ENABLE
1639 /* we might have forked, so queue fork handlers */
1640 if (expect_false (postfork))
1641 if (forkcnt)
1642 {
1643 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1644 call_pending (EV_A);
1645 }
1646 #endif
1647
1648 /* queue prepare watchers (and execute them) */
1649 if (expect_false (preparecnt))
1650 {
1651 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1652 call_pending (EV_A);
1653 }
1654
1655 if (expect_false (!activecnt))
1656 break;
1657
1658 /* we might have forked, so reify kernel state if necessary */
1659 if (expect_false (postfork))
1660 loop_fork (EV_A);
1661
1662 /* update fd-related kernel structures */
1663 fd_reify (EV_A);
1664
1665 /* calculate blocking time */
1666 {
1667 ev_tstamp waittime = 0.;
1668 ev_tstamp sleeptime = 0.;
1669
1670 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1671 {
1672 /* update time to cancel out callback processing overhead */
1673 time_update (EV_A_ 1e100);
1674
1675 waittime = MAX_BLOCKTIME;
1676
1677 if (timercnt)
1678 {
1679 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1680 if (waittime > to) waittime = to;
1681 }
1682
1683 #if EV_PERIODIC_ENABLE
1684 if (periodiccnt)
1685 {
1686 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1687 if (waittime > to) waittime = to;
1688 }
1689 #endif
1690
1691 if (expect_false (waittime < timeout_blocktime))
1692 waittime = timeout_blocktime;
1693
1694 sleeptime = waittime - backend_fudge;
1695
1696 if (expect_true (sleeptime > io_blocktime))
1697 sleeptime = io_blocktime;
1698
1699 if (sleeptime)
1700 {
1701 ev_sleep (sleeptime);
1702 waittime -= sleeptime;
1703 }
1704 }
1705
1706 ++loop_count;
1707 backend_poll (EV_A_ waittime);
1708
1709 /* update ev_rt_now, do magic */
1710 time_update (EV_A_ waittime + sleeptime);
1711 }
1712
1713 /* queue pending timers and reschedule them */
1714 timers_reify (EV_A); /* relative timers called last */
1715 #if EV_PERIODIC_ENABLE
1716 periodics_reify (EV_A); /* absolute timers called first */
1717 #endif
1718
1719 #if EV_IDLE_ENABLE
1720 /* queue idle watchers unless other events are pending */
1721 idle_reify (EV_A);
1722 #endif
1723
1724 /* queue check watchers, to be executed first */
1725 if (expect_false (checkcnt))
1726 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1727
1728 call_pending (EV_A);
1729 }
1730 while (expect_true (
1731 activecnt
1732 && !loop_done
1733 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
1734 ));
1735
1736 if (loop_done == EVUNLOOP_ONE)
1737 loop_done = EVUNLOOP_CANCEL;
1738 }
1739
1740 void
1741 ev_unloop (EV_P_ int how)
1742 {
1743 loop_done = how;
1744 }
1745
1746 /*****************************************************************************/
1747
1748 void inline_size
1749 wlist_add (WL *head, WL elem)
1750 {
1751 elem->next = *head;
1752 *head = elem;
1753 }
1754
1755 void inline_size
1756 wlist_del (WL *head, WL elem)
1757 {
1758 while (*head)
1759 {
1760 if (*head == elem)
1761 {
1762 *head = elem->next;
1763 return;
1764 }
1765
1766 head = &(*head)->next;
1767 }
1768 }
1769
1770 void inline_speed
1771 clear_pending (EV_P_ W w)
1772 {
1773 if (w->pending)
1774 {
1775 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1776 w->pending = 0;
1777 }
1778 }
1779
1780 int
1781 ev_clear_pending (EV_P_ void *w)
1782 {
1783 W w_ = (W)w;
1784 int pending = w_->pending;
1785
1786 if (expect_true (pending))
1787 {
1788 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1789 w_->pending = 0;
1790 p->w = 0;
1791 return p->events;
1792 }
1793 else
1794 return 0;
1795 }
1796
1797 void inline_size
1798 pri_adjust (EV_P_ W w)
1799 {
1800 int pri = w->priority;
1801 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1802 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1803 w->priority = pri;
1804 }
1805
1806 void inline_speed
1807 ev_start (EV_P_ W w, int active)
1808 {
1809 pri_adjust (EV_A_ w);
1810 w->active = active;
1811 ev_ref (EV_A);
1812 }
1813
1814 void inline_size
1815 ev_stop (EV_P_ W w)
1816 {
1817 ev_unref (EV_A);
1818 w->active = 0;
1819 }
1820
1821 /*****************************************************************************/
1822
1823 void noinline
1824 ev_io_start (EV_P_ ev_io *w)
1825 {
1826 int fd = w->fd;
1827
1828 if (expect_false (ev_is_active (w)))
1829 return;
1830
1831 assert (("ev_io_start called with negative fd", fd >= 0));
1832
1833 ev_start (EV_A_ (W)w, 1);
1834 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1835 wlist_add (&anfds[fd].head, (WL)w);
1836
1837 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1838 w->events &= ~EV_IOFDSET;
1839 }
1840
1841 void noinline
1842 ev_io_stop (EV_P_ ev_io *w)
1843 {
1844 clear_pending (EV_A_ (W)w);
1845 if (expect_false (!ev_is_active (w)))
1846 return;
1847
1848 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1849
1850 wlist_del (&anfds[w->fd].head, (WL)w);
1851 ev_stop (EV_A_ (W)w);
1852
1853 fd_change (EV_A_ w->fd, 1);
1854 }
1855
1856 void noinline
1857 ev_timer_start (EV_P_ ev_timer *w)
1858 {
1859 if (expect_false (ev_is_active (w)))
1860 return;
1861
1862 ((WT)w)->at += mn_now;
1863
1864 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1865
1866 ev_start (EV_A_ (W)w, ++timercnt);
1867 array_needsize (WT, timers, timermax, timercnt, EMPTY2);
1868 timers [timercnt - 1] = (WT)w;
1869 upheap (timers, timercnt - 1);
1870
1871 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1872 }
1873
1874 void noinline
1875 ev_timer_stop (EV_P_ ev_timer *w)
1876 {
1877 clear_pending (EV_A_ (W)w);
1878 if (expect_false (!ev_is_active (w)))
1879 return;
1880
1881 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
1882
1883 {
1884 int active = ((W)w)->active;
1885
1886 if (expect_true (--active < --timercnt))
1887 {
1888 timers [active] = timers [timercnt];
1889 adjustheap (timers, timercnt, active);
1890 }
1891 }
1892
1893 ((WT)w)->at -= mn_now;
1894
1895 ev_stop (EV_A_ (W)w);
1896 }
1897
1898 void noinline
1899 ev_timer_again (EV_P_ ev_timer *w)
1900 {
1901 if (ev_is_active (w))
1902 {
1903 if (w->repeat)
1904 {
1905 ((WT)w)->at = mn_now + w->repeat;
1906 adjustheap (timers, timercnt, ((W)w)->active - 1);
1907 }
1908 else
1909 ev_timer_stop (EV_A_ w);
1910 }
1911 else if (w->repeat)
1912 {
1913 w->at = w->repeat;
1914 ev_timer_start (EV_A_ w);
1915 }
1916 }
1917
1918 #if EV_PERIODIC_ENABLE
1919 void noinline
1920 ev_periodic_start (EV_P_ ev_periodic *w)
1921 {
1922 if (expect_false (ev_is_active (w)))
1923 return;
1924
1925 if (w->reschedule_cb)
1926 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1927 else if (w->interval)
1928 {
1929 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1930 /* this formula differs from the one in periodic_reify because we do not always round up */
1931 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1932 }
1933 else
1934 ((WT)w)->at = w->offset;
1935
1936 ev_start (EV_A_ (W)w, ++periodiccnt);
1937 array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
1938 periodics [periodiccnt - 1] = (WT)w;
1939 upheap (periodics, periodiccnt - 1);
1940
1941 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1942 }
1943
1944 void noinline
1945 ev_periodic_stop (EV_P_ ev_periodic *w)
1946 {
1947 clear_pending (EV_A_ (W)w);
1948 if (expect_false (!ev_is_active (w)))
1949 return;
1950
1951 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
1952
1953 {
1954 int active = ((W)w)->active;
1955
1956 if (expect_true (--active < --periodiccnt))
1957 {
1958 periodics [active] = periodics [periodiccnt];
1959 adjustheap (periodics, periodiccnt, active);
1960 }
1961 }
1962
1963 ev_stop (EV_A_ (W)w);
1964 }
1965
1966 void noinline
1967 ev_periodic_again (EV_P_ ev_periodic *w)
1968 {
1969 /* TODO: use adjustheap and recalculation */
1970 ev_periodic_stop (EV_A_ w);
1971 ev_periodic_start (EV_A_ w);
1972 }
1973 #endif
1974
1975 #ifndef SA_RESTART
1976 # define SA_RESTART 0
1977 #endif
1978
1979 void noinline
1980 ev_signal_start (EV_P_ ev_signal *w)
1981 {
1982 #if EV_MULTIPLICITY
1983 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1984 #endif
1985 if (expect_false (ev_is_active (w)))
1986 return;
1987
1988 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1989
1990 evpipe_init (EV_A);
1991
1992 {
1993 #ifndef _WIN32
1994 sigset_t full, prev;
1995 sigfillset (&full);
1996 sigprocmask (SIG_SETMASK, &full, &prev);
1997 #endif
1998
1999 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2000
2001 #ifndef _WIN32
2002 sigprocmask (SIG_SETMASK, &prev, 0);
2003 #endif
2004 }
2005
2006 ev_start (EV_A_ (W)w, 1);
2007 wlist_add (&signals [w->signum - 1].head, (WL)w);
2008
2009 if (!((WL)w)->next)
2010 {
2011 #if _WIN32
2012 signal (w->signum, ev_sighandler);
2013 #else
2014 struct sigaction sa;
2015 sa.sa_handler = ev_sighandler;
2016 sigfillset (&sa.sa_mask);
2017 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2018 sigaction (w->signum, &sa, 0);
2019 #endif
2020 }
2021 }
2022
2023 void noinline
2024 ev_signal_stop (EV_P_ ev_signal *w)
2025 {
2026 clear_pending (EV_A_ (W)w);
2027 if (expect_false (!ev_is_active (w)))
2028 return;
2029
2030 wlist_del (&signals [w->signum - 1].head, (WL)w);
2031 ev_stop (EV_A_ (W)w);
2032
2033 if (!signals [w->signum - 1].head)
2034 signal (w->signum, SIG_DFL);
2035 }
2036
2037 void
2038 ev_child_start (EV_P_ ev_child *w)
2039 {
2040 #if EV_MULTIPLICITY
2041 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2042 #endif
2043 if (expect_false (ev_is_active (w)))
2044 return;
2045
2046 ev_start (EV_A_ (W)w, 1);
2047 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2048 }
2049
2050 void
2051 ev_child_stop (EV_P_ ev_child *w)
2052 {
2053 clear_pending (EV_A_ (W)w);
2054 if (expect_false (!ev_is_active (w)))
2055 return;
2056
2057 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2058 ev_stop (EV_A_ (W)w);
2059 }
2060
2061 #if EV_STAT_ENABLE
2062
2063 # ifdef _WIN32
2064 # undef lstat
2065 # define lstat(a,b) _stati64 (a,b)
2066 # endif
2067
2068 #define DEF_STAT_INTERVAL 5.0074891
2069 #define MIN_STAT_INTERVAL 0.1074891
2070
2071 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2072
2073 #if EV_USE_INOTIFY
2074 # define EV_INOTIFY_BUFSIZE 8192
2075
2076 static void noinline
2077 infy_add (EV_P_ ev_stat *w)
2078 {
2079 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);
2080
2081 if (w->wd < 0)
2082 {
2083 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2084
2085 /* monitor some parent directory for speedup hints */
2086 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2087 {
2088 char path [4096];
2089 strcpy (path, w->path);
2090
2091 do
2092 {
2093 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2094 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2095
2096 char *pend = strrchr (path, '/');
2097
2098 if (!pend)
2099 break; /* whoops, no '/', complain to your admin */
2100
2101 *pend = 0;
2102 w->wd = inotify_add_watch (fs_fd, path, mask);
2103 }
2104 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2105 }
2106 }
2107 else
2108 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2109
2110 if (w->wd >= 0)
2111 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2112 }
2113
2114 static void noinline
2115 infy_del (EV_P_ ev_stat *w)
2116 {
2117 int slot;
2118 int wd = w->wd;
2119
2120 if (wd < 0)
2121 return;
2122
2123 w->wd = -2;
2124 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2125 wlist_del (&fs_hash [slot].head, (WL)w);
2126
2127 /* remove this watcher, if others are watching it, they will rearm */
2128 inotify_rm_watch (fs_fd, wd);
2129 }
2130
2131 static void noinline
2132 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2133 {
2134 if (slot < 0)
2135 /* overflow, need to check for all hahs slots */
2136 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2137 infy_wd (EV_A_ slot, wd, ev);
2138 else
2139 {
2140 WL w_;
2141
2142 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2143 {
2144 ev_stat *w = (ev_stat *)w_;
2145 w_ = w_->next; /* lets us remove this watcher and all before it */
2146
2147 if (w->wd == wd || wd == -1)
2148 {
2149 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2150 {
2151 w->wd = -1;
2152 infy_add (EV_A_ w); /* re-add, no matter what */
2153 }
2154
2155 stat_timer_cb (EV_A_ &w->timer, 0);
2156 }
2157 }
2158 }
2159 }
2160
2161 static void
2162 infy_cb (EV_P_ ev_io *w, int revents)
2163 {
2164 char buf [EV_INOTIFY_BUFSIZE];
2165 struct inotify_event *ev = (struct inotify_event *)buf;
2166 int ofs;
2167 int len = read (fs_fd, buf, sizeof (buf));
2168
2169 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2170 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2171 }
2172
2173 void inline_size
2174 infy_init (EV_P)
2175 {
2176 if (fs_fd != -2)
2177 return;
2178
2179 fs_fd = inotify_init ();
2180
2181 if (fs_fd >= 0)
2182 {
2183 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2184 ev_set_priority (&fs_w, EV_MAXPRI);
2185 ev_io_start (EV_A_ &fs_w);
2186 }
2187 }
2188
2189 void inline_size
2190 infy_fork (EV_P)
2191 {
2192 int slot;
2193
2194 if (fs_fd < 0)
2195 return;
2196
2197 close (fs_fd);
2198 fs_fd = inotify_init ();
2199
2200 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2201 {
2202 WL w_ = fs_hash [slot].head;
2203 fs_hash [slot].head = 0;
2204
2205 while (w_)
2206 {
2207 ev_stat *w = (ev_stat *)w_;
2208 w_ = w_->next; /* lets us add this watcher */
2209
2210 w->wd = -1;
2211
2212 if (fs_fd >= 0)
2213 infy_add (EV_A_ w); /* re-add, no matter what */
2214 else
2215 ev_timer_start (EV_A_ &w->timer);
2216 }
2217
2218 }
2219 }
2220
2221 #endif
2222
2223 void
2224 ev_stat_stat (EV_P_ ev_stat *w)
2225 {
2226 if (lstat (w->path, &w->attr) < 0)
2227 w->attr.st_nlink = 0;
2228 else if (!w->attr.st_nlink)
2229 w->attr.st_nlink = 1;
2230 }
2231
2232 static void noinline
2233 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2234 {
2235 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2236
2237 /* we copy this here each the time so that */
2238 /* prev has the old value when the callback gets invoked */
2239 w->prev = w->attr;
2240 ev_stat_stat (EV_A_ w);
2241
2242 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2243 if (
2244 w->prev.st_dev != w->attr.st_dev
2245 || w->prev.st_ino != w->attr.st_ino
2246 || w->prev.st_mode != w->attr.st_mode
2247 || w->prev.st_nlink != w->attr.st_nlink
2248 || w->prev.st_uid != w->attr.st_uid
2249 || w->prev.st_gid != w->attr.st_gid
2250 || w->prev.st_rdev != w->attr.st_rdev
2251 || w->prev.st_size != w->attr.st_size
2252 || w->prev.st_atime != w->attr.st_atime
2253 || w->prev.st_mtime != w->attr.st_mtime
2254 || w->prev.st_ctime != w->attr.st_ctime
2255 ) {
2256 #if EV_USE_INOTIFY
2257 infy_del (EV_A_ w);
2258 infy_add (EV_A_ w);
2259 ev_stat_stat (EV_A_ w); /* avoid race... */
2260 #endif
2261
2262 ev_feed_event (EV_A_ w, EV_STAT);
2263 }
2264 }
2265
2266 void
2267 ev_stat_start (EV_P_ ev_stat *w)
2268 {
2269 if (expect_false (ev_is_active (w)))
2270 return;
2271
2272 /* since we use memcmp, we need to clear any padding data etc. */
2273 memset (&w->prev, 0, sizeof (ev_statdata));
2274 memset (&w->attr, 0, sizeof (ev_statdata));
2275
2276 ev_stat_stat (EV_A_ w);
2277
2278 if (w->interval < MIN_STAT_INTERVAL)
2279 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2280
2281 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2282 ev_set_priority (&w->timer, ev_priority (w));
2283
2284 #if EV_USE_INOTIFY
2285 infy_init (EV_A);
2286
2287 if (fs_fd >= 0)
2288 infy_add (EV_A_ w);
2289 else
2290 #endif
2291 ev_timer_start (EV_A_ &w->timer);
2292
2293 ev_start (EV_A_ (W)w, 1);
2294 }
2295
2296 void
2297 ev_stat_stop (EV_P_ ev_stat *w)
2298 {
2299 clear_pending (EV_A_ (W)w);
2300 if (expect_false (!ev_is_active (w)))
2301 return;
2302
2303 #if EV_USE_INOTIFY
2304 infy_del (EV_A_ w);
2305 #endif
2306 ev_timer_stop (EV_A_ &w->timer);
2307
2308 ev_stop (EV_A_ (W)w);
2309 }
2310 #endif
2311
2312 #if EV_IDLE_ENABLE
2313 void
2314 ev_idle_start (EV_P_ ev_idle *w)
2315 {
2316 if (expect_false (ev_is_active (w)))
2317 return;
2318
2319 pri_adjust (EV_A_ (W)w);
2320
2321 {
2322 int active = ++idlecnt [ABSPRI (w)];
2323
2324 ++idleall;
2325 ev_start (EV_A_ (W)w, active);
2326
2327 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2328 idles [ABSPRI (w)][active - 1] = w;
2329 }
2330 }
2331
2332 void
2333 ev_idle_stop (EV_P_ ev_idle *w)
2334 {
2335 clear_pending (EV_A_ (W)w);
2336 if (expect_false (!ev_is_active (w)))
2337 return;
2338
2339 {
2340 int active = ((W)w)->active;
2341
2342 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2343 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2344
2345 ev_stop (EV_A_ (W)w);
2346 --idleall;
2347 }
2348 }
2349 #endif
2350
2351 void
2352 ev_prepare_start (EV_P_ ev_prepare *w)
2353 {
2354 if (expect_false (ev_is_active (w)))
2355 return;
2356
2357 ev_start (EV_A_ (W)w, ++preparecnt);
2358 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2359 prepares [preparecnt - 1] = w;
2360 }
2361
2362 void
2363 ev_prepare_stop (EV_P_ ev_prepare *w)
2364 {
2365 clear_pending (EV_A_ (W)w);
2366 if (expect_false (!ev_is_active (w)))
2367 return;
2368
2369 {
2370 int active = ((W)w)->active;
2371 prepares [active - 1] = prepares [--preparecnt];
2372 ((W)prepares [active - 1])->active = active;
2373 }
2374
2375 ev_stop (EV_A_ (W)w);
2376 }
2377
2378 void
2379 ev_check_start (EV_P_ ev_check *w)
2380 {
2381 if (expect_false (ev_is_active (w)))
2382 return;
2383
2384 ev_start (EV_A_ (W)w, ++checkcnt);
2385 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2386 checks [checkcnt - 1] = w;
2387 }
2388
2389 void
2390 ev_check_stop (EV_P_ ev_check *w)
2391 {
2392 clear_pending (EV_A_ (W)w);
2393 if (expect_false (!ev_is_active (w)))
2394 return;
2395
2396 {
2397 int active = ((W)w)->active;
2398 checks [active - 1] = checks [--checkcnt];
2399 ((W)checks [active - 1])->active = active;
2400 }
2401
2402 ev_stop (EV_A_ (W)w);
2403 }
2404
2405 #if EV_EMBED_ENABLE
2406 void noinline
2407 ev_embed_sweep (EV_P_ ev_embed *w)
2408 {
2409 ev_loop (w->other, EVLOOP_NONBLOCK);
2410 }
2411
2412 static void
2413 embed_io_cb (EV_P_ ev_io *io, int revents)
2414 {
2415 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2416
2417 if (ev_cb (w))
2418 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2419 else
2420 ev_loop (w->other, EVLOOP_NONBLOCK);
2421 }
2422
2423 static void
2424 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2425 {
2426 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2427
2428 {
2429 struct ev_loop *loop = w->other;
2430
2431 while (fdchangecnt)
2432 {
2433 fd_reify (EV_A);
2434 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2435 }
2436 }
2437 }
2438
2439 #if 0
2440 static void
2441 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2442 {
2443 ev_idle_stop (EV_A_ idle);
2444 }
2445 #endif
2446
2447 void
2448 ev_embed_start (EV_P_ ev_embed *w)
2449 {
2450 if (expect_false (ev_is_active (w)))
2451 return;
2452
2453 {
2454 struct ev_loop *loop = w->other;
2455 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2456 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2457 }
2458
2459 ev_set_priority (&w->io, ev_priority (w));
2460 ev_io_start (EV_A_ &w->io);
2461
2462 ev_prepare_init (&w->prepare, embed_prepare_cb);
2463 ev_set_priority (&w->prepare, EV_MINPRI);
2464 ev_prepare_start (EV_A_ &w->prepare);
2465
2466 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2467
2468 ev_start (EV_A_ (W)w, 1);
2469 }
2470
2471 void
2472 ev_embed_stop (EV_P_ ev_embed *w)
2473 {
2474 clear_pending (EV_A_ (W)w);
2475 if (expect_false (!ev_is_active (w)))
2476 return;
2477
2478 ev_io_stop (EV_A_ &w->io);
2479 ev_prepare_stop (EV_A_ &w->prepare);
2480
2481 ev_stop (EV_A_ (W)w);
2482 }
2483 #endif
2484
2485 #if EV_FORK_ENABLE
2486 void
2487 ev_fork_start (EV_P_ ev_fork *w)
2488 {
2489 if (expect_false (ev_is_active (w)))
2490 return;
2491
2492 ev_start (EV_A_ (W)w, ++forkcnt);
2493 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2494 forks [forkcnt - 1] = w;
2495 }
2496
2497 void
2498 ev_fork_stop (EV_P_ ev_fork *w)
2499 {
2500 clear_pending (EV_A_ (W)w);
2501 if (expect_false (!ev_is_active (w)))
2502 return;
2503
2504 {
2505 int active = ((W)w)->active;
2506 forks [active - 1] = forks [--forkcnt];
2507 ((W)forks [active - 1])->active = active;
2508 }
2509
2510 ev_stop (EV_A_ (W)w);
2511 }
2512 #endif
2513
2514 #if EV_ASYNC_ENABLE
2515 void
2516 ev_async_start (EV_P_ ev_async *w)
2517 {
2518 if (expect_false (ev_is_active (w)))
2519 return;
2520
2521 evpipe_init (EV_A);
2522
2523 ev_start (EV_A_ (W)w, ++asynccnt);
2524 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2525 asyncs [asynccnt - 1] = w;
2526 }
2527
2528 void
2529 ev_async_stop (EV_P_ ev_async *w)
2530 {
2531 clear_pending (EV_A_ (W)w);
2532 if (expect_false (!ev_is_active (w)))
2533 return;
2534
2535 {
2536 int active = ((W)w)->active;
2537 asyncs [active - 1] = asyncs [--asynccnt];
2538 ((W)asyncs [active - 1])->active = active;
2539 }
2540
2541 ev_stop (EV_A_ (W)w);
2542 }
2543
2544 void
2545 ev_async_send (EV_P_ ev_async *w)
2546 {
2547 w->sent = 1;
2548 evpipe_write (EV_A_ &gotasync);
2549 }
2550 #endif
2551
2552 /*****************************************************************************/
2553
2554 struct ev_once
2555 {
2556 ev_io io;
2557 ev_timer to;
2558 void (*cb)(int revents, void *arg);
2559 void *arg;
2560 };
2561
2562 static void
2563 once_cb (EV_P_ struct ev_once *once, int revents)
2564 {
2565 void (*cb)(int revents, void *arg) = once->cb;
2566 void *arg = once->arg;
2567
2568 ev_io_stop (EV_A_ &once->io);
2569 ev_timer_stop (EV_A_ &once->to);
2570 ev_free (once);
2571
2572 cb (revents, arg);
2573 }
2574
2575 static void
2576 once_cb_io (EV_P_ ev_io *w, int revents)
2577 {
2578 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2579 }
2580
2581 static void
2582 once_cb_to (EV_P_ ev_timer *w, int revents)
2583 {
2584 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2585 }
2586
2587 void
2588 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2589 {
2590 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2591
2592 if (expect_false (!once))
2593 {
2594 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2595 return;
2596 }
2597
2598 once->cb = cb;
2599 once->arg = arg;
2600
2601 ev_init (&once->io, once_cb_io);
2602 if (fd >= 0)
2603 {
2604 ev_io_set (&once->io, fd, events);
2605 ev_io_start (EV_A_ &once->io);
2606 }
2607
2608 ev_init (&once->to, once_cb_to);
2609 if (timeout >= 0.)
2610 {
2611 ev_timer_set (&once->to, timeout, 0.);
2612 ev_timer_start (EV_A_ &once->to);
2613 }
2614 }
2615
2616 #if EV_MULTIPLICITY
2617 #include "ev_wrap.h"
2618 #endif
2619
2620 #ifdef __cplusplus
2621 }
2622 #endif
2623