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Revision: 1.223
Committed: Sun Apr 6 14:34:50 2008 UTC (16 years, 3 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.222: +1 -1 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 # ifdef __cplusplus
275 extern "C" {
276 # endif
277 int eventfd (unsigned int initval, int flags);
278 # ifdef __cplusplus
279 }
280 # endif
281 #endif
282
283 /**/
284
285 /*
286 * This is used to avoid floating point rounding problems.
287 * It is added to ev_rt_now when scheduling periodics
288 * to ensure progress, time-wise, even when rounding
289 * errors are against us.
290 * This value is good at least till the year 4000.
291 * Better solutions welcome.
292 */
293 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
294
295 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
296 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
297 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
298
299 #if __GNUC__ >= 4
300 # define expect(expr,value) __builtin_expect ((expr),(value))
301 # define noinline __attribute__ ((noinline))
302 #else
303 # define expect(expr,value) (expr)
304 # define noinline
305 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
306 # define inline
307 # endif
308 #endif
309
310 #define expect_false(expr) expect ((expr) != 0, 0)
311 #define expect_true(expr) expect ((expr) != 0, 1)
312 #define inline_size static inline
313
314 #if EV_MINIMAL
315 # define inline_speed static noinline
316 #else
317 # define inline_speed static inline
318 #endif
319
320 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
321 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
322
323 #define EMPTY /* required for microsofts broken pseudo-c compiler */
324 #define EMPTY2(a,b) /* used to suppress some warnings */
325
326 typedef ev_watcher *W;
327 typedef ev_watcher_list *WL;
328 typedef ev_watcher_time *WT;
329
330 #if EV_USE_MONOTONIC
331 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
332 /* giving it a reasonably high chance of working on typical architetcures */
333 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
334 #endif
335
336 #ifdef _WIN32
337 # include "ev_win32.c"
338 #endif
339
340 /*****************************************************************************/
341
342 static void (*syserr_cb)(const char *msg);
343
344 void
345 ev_set_syserr_cb (void (*cb)(const char *msg))
346 {
347 syserr_cb = cb;
348 }
349
350 static void noinline
351 syserr (const char *msg)
352 {
353 if (!msg)
354 msg = "(libev) system error";
355
356 if (syserr_cb)
357 syserr_cb (msg);
358 else
359 {
360 perror (msg);
361 abort ();
362 }
363 }
364
365 static void *(*alloc)(void *ptr, long size);
366
367 void
368 ev_set_allocator (void *(*cb)(void *ptr, long size))
369 {
370 alloc = cb;
371 }
372
373 inline_speed void *
374 ev_realloc (void *ptr, long size)
375 {
376 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
377
378 if (!ptr && size)
379 {
380 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
381 abort ();
382 }
383
384 return ptr;
385 }
386
387 #define ev_malloc(size) ev_realloc (0, (size))
388 #define ev_free(ptr) ev_realloc ((ptr), 0)
389
390 /*****************************************************************************/
391
392 typedef struct
393 {
394 WL head;
395 unsigned char events;
396 unsigned char reify;
397 #if EV_SELECT_IS_WINSOCKET
398 SOCKET handle;
399 #endif
400 } ANFD;
401
402 typedef struct
403 {
404 W w;
405 int events;
406 } ANPENDING;
407
408 #if EV_USE_INOTIFY
409 typedef struct
410 {
411 WL head;
412 } ANFS;
413 #endif
414
415 #if EV_MULTIPLICITY
416
417 struct ev_loop
418 {
419 ev_tstamp ev_rt_now;
420 #define ev_rt_now ((loop)->ev_rt_now)
421 #define VAR(name,decl) decl;
422 #include "ev_vars.h"
423 #undef VAR
424 };
425 #include "ev_wrap.h"
426
427 static struct ev_loop default_loop_struct;
428 struct ev_loop *ev_default_loop_ptr;
429
430 #else
431
432 ev_tstamp ev_rt_now;
433 #define VAR(name,decl) static decl;
434 #include "ev_vars.h"
435 #undef VAR
436
437 static int ev_default_loop_ptr;
438
439 #endif
440
441 /*****************************************************************************/
442
443 ev_tstamp
444 ev_time (void)
445 {
446 #if EV_USE_REALTIME
447 struct timespec ts;
448 clock_gettime (CLOCK_REALTIME, &ts);
449 return ts.tv_sec + ts.tv_nsec * 1e-9;
450 #else
451 struct timeval tv;
452 gettimeofday (&tv, 0);
453 return tv.tv_sec + tv.tv_usec * 1e-6;
454 #endif
455 }
456
457 ev_tstamp inline_size
458 get_clock (void)
459 {
460 #if EV_USE_MONOTONIC
461 if (expect_true (have_monotonic))
462 {
463 struct timespec ts;
464 clock_gettime (CLOCK_MONOTONIC, &ts);
465 return ts.tv_sec + ts.tv_nsec * 1e-9;
466 }
467 #endif
468
469 return ev_time ();
470 }
471
472 #if EV_MULTIPLICITY
473 ev_tstamp
474 ev_now (EV_P)
475 {
476 return ev_rt_now;
477 }
478 #endif
479
480 void
481 ev_sleep (ev_tstamp delay)
482 {
483 if (delay > 0.)
484 {
485 #if EV_USE_NANOSLEEP
486 struct timespec ts;
487
488 ts.tv_sec = (time_t)delay;
489 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
490
491 nanosleep (&ts, 0);
492 #elif defined(_WIN32)
493 Sleep ((unsigned long)(delay * 1e3));
494 #else
495 struct timeval tv;
496
497 tv.tv_sec = (time_t)delay;
498 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
499
500 select (0, 0, 0, 0, &tv);
501 #endif
502 }
503 }
504
505 /*****************************************************************************/
506
507 int inline_size
508 array_nextsize (int elem, int cur, int cnt)
509 {
510 int ncur = cur + 1;
511
512 do
513 ncur <<= 1;
514 while (cnt > ncur);
515
516 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
517 if (elem * ncur > 4096)
518 {
519 ncur *= elem;
520 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
521 ncur = ncur - sizeof (void *) * 4;
522 ncur /= elem;
523 }
524
525 return ncur;
526 }
527
528 static noinline void *
529 array_realloc (int elem, void *base, int *cur, int cnt)
530 {
531 *cur = array_nextsize (elem, *cur, cnt);
532 return ev_realloc (base, elem * *cur);
533 }
534
535 #define array_needsize(type,base,cur,cnt,init) \
536 if (expect_false ((cnt) > (cur))) \
537 { \
538 int ocur_ = (cur); \
539 (base) = (type *)array_realloc \
540 (sizeof (type), (base), &(cur), (cnt)); \
541 init ((base) + (ocur_), (cur) - ocur_); \
542 }
543
544 #if 0
545 #define array_slim(type,stem) \
546 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
547 { \
548 stem ## max = array_roundsize (stem ## cnt >> 1); \
549 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
550 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
551 }
552 #endif
553
554 #define array_free(stem, idx) \
555 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
556
557 /*****************************************************************************/
558
559 void noinline
560 ev_feed_event (EV_P_ void *w, int revents)
561 {
562 W w_ = (W)w;
563 int pri = ABSPRI (w_);
564
565 if (expect_false (w_->pending))
566 pendings [pri][w_->pending - 1].events |= revents;
567 else
568 {
569 w_->pending = ++pendingcnt [pri];
570 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
571 pendings [pri][w_->pending - 1].w = w_;
572 pendings [pri][w_->pending - 1].events = revents;
573 }
574 }
575
576 void inline_speed
577 queue_events (EV_P_ W *events, int eventcnt, int type)
578 {
579 int i;
580
581 for (i = 0; i < eventcnt; ++i)
582 ev_feed_event (EV_A_ events [i], type);
583 }
584
585 /*****************************************************************************/
586
587 void inline_size
588 anfds_init (ANFD *base, int count)
589 {
590 while (count--)
591 {
592 base->head = 0;
593 base->events = EV_NONE;
594 base->reify = 0;
595
596 ++base;
597 }
598 }
599
600 void inline_speed
601 fd_event (EV_P_ int fd, int revents)
602 {
603 ANFD *anfd = anfds + fd;
604 ev_io *w;
605
606 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
607 {
608 int ev = w->events & revents;
609
610 if (ev)
611 ev_feed_event (EV_A_ (W)w, ev);
612 }
613 }
614
615 void
616 ev_feed_fd_event (EV_P_ int fd, int revents)
617 {
618 if (fd >= 0 && fd < anfdmax)
619 fd_event (EV_A_ fd, revents);
620 }
621
622 void inline_size
623 fd_reify (EV_P)
624 {
625 int i;
626
627 for (i = 0; i < fdchangecnt; ++i)
628 {
629 int fd = fdchanges [i];
630 ANFD *anfd = anfds + fd;
631 ev_io *w;
632
633 unsigned char events = 0;
634
635 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
636 events |= (unsigned char)w->events;
637
638 #if EV_SELECT_IS_WINSOCKET
639 if (events)
640 {
641 unsigned long argp;
642 #ifdef EV_FD_TO_WIN32_HANDLE
643 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
644 #else
645 anfd->handle = _get_osfhandle (fd);
646 #endif
647 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
648 }
649 #endif
650
651 {
652 unsigned char o_events = anfd->events;
653 unsigned char o_reify = anfd->reify;
654
655 anfd->reify = 0;
656 anfd->events = events;
657
658 if (o_events != events || o_reify & EV_IOFDSET)
659 backend_modify (EV_A_ fd, o_events, events);
660 }
661 }
662
663 fdchangecnt = 0;
664 }
665
666 void inline_size
667 fd_change (EV_P_ int fd, int flags)
668 {
669 unsigned char reify = anfds [fd].reify;
670 anfds [fd].reify |= flags;
671
672 if (expect_true (!reify))
673 {
674 ++fdchangecnt;
675 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
676 fdchanges [fdchangecnt - 1] = fd;
677 }
678 }
679
680 void inline_speed
681 fd_kill (EV_P_ int fd)
682 {
683 ev_io *w;
684
685 while ((w = (ev_io *)anfds [fd].head))
686 {
687 ev_io_stop (EV_A_ w);
688 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
689 }
690 }
691
692 int inline_size
693 fd_valid (int fd)
694 {
695 #ifdef _WIN32
696 return _get_osfhandle (fd) != -1;
697 #else
698 return fcntl (fd, F_GETFD) != -1;
699 #endif
700 }
701
702 /* called on EBADF to verify fds */
703 static void noinline
704 fd_ebadf (EV_P)
705 {
706 int fd;
707
708 for (fd = 0; fd < anfdmax; ++fd)
709 if (anfds [fd].events)
710 if (!fd_valid (fd) == -1 && errno == EBADF)
711 fd_kill (EV_A_ fd);
712 }
713
714 /* called on ENOMEM in select/poll to kill some fds and retry */
715 static void noinline
716 fd_enomem (EV_P)
717 {
718 int fd;
719
720 for (fd = anfdmax; fd--; )
721 if (anfds [fd].events)
722 {
723 fd_kill (EV_A_ fd);
724 return;
725 }
726 }
727
728 /* usually called after fork if backend needs to re-arm all fds from scratch */
729 static void noinline
730 fd_rearm_all (EV_P)
731 {
732 int fd;
733
734 for (fd = 0; fd < anfdmax; ++fd)
735 if (anfds [fd].events)
736 {
737 anfds [fd].events = 0;
738 fd_change (EV_A_ fd, EV_IOFDSET | 1);
739 }
740 }
741
742 /*****************************************************************************/
743
744 void inline_speed
745 upheap (WT *heap, int k)
746 {
747 WT w = heap [k];
748
749 while (k)
750 {
751 int p = (k - 1) >> 1;
752
753 if (heap [p]->at <= w->at)
754 break;
755
756 heap [k] = heap [p];
757 ((W)heap [k])->active = k + 1;
758 k = p;
759 }
760
761 heap [k] = w;
762 ((W)heap [k])->active = k + 1;
763 }
764
765 void inline_speed
766 downheap (WT *heap, int N, int k)
767 {
768 WT w = heap [k];
769
770 for (;;)
771 {
772 int c = (k << 1) + 1;
773
774 if (c >= N)
775 break;
776
777 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
778 ? 1 : 0;
779
780 if (w->at <= heap [c]->at)
781 break;
782
783 heap [k] = heap [c];
784 ((W)heap [k])->active = k + 1;
785
786 k = c;
787 }
788
789 heap [k] = w;
790 ((W)heap [k])->active = k + 1;
791 }
792
793 void inline_size
794 adjustheap (WT *heap, int N, int k)
795 {
796 upheap (heap, k);
797 downheap (heap, N, k);
798 }
799
800 /*****************************************************************************/
801
802 typedef struct
803 {
804 WL head;
805 EV_ATOMIC_T gotsig;
806 } ANSIG;
807
808 static ANSIG *signals;
809 static int signalmax;
810
811 static EV_ATOMIC_T gotsig;
812
813 void inline_size
814 signals_init (ANSIG *base, int count)
815 {
816 while (count--)
817 {
818 base->head = 0;
819 base->gotsig = 0;
820
821 ++base;
822 }
823 }
824
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 evpipe_init (EV_P)
841 {
842 if (!ev_is_active (&pipeev))
843 {
844 #if EV_USE_EVENTFD
845 if ((evfd = eventfd (0, 0)) >= 0)
846 {
847 evpipe [0] = -1;
848 fd_intern (evfd);
849 ev_io_set (&pipeev, evfd, EV_READ);
850 }
851 else
852 #endif
853 {
854 while (pipe (evpipe))
855 syserr ("(libev) error creating signal/async pipe");
856
857 fd_intern (evpipe [0]);
858 fd_intern (evpipe [1]);
859 ev_io_set (&pipeev, evpipe [0], EV_READ);
860 }
861
862 ev_io_start (EV_A_ &pipeev);
863 ev_unref (EV_A); /* watcher should not keep loop alive */
864 }
865 }
866
867 void inline_size
868 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
869 {
870 if (!*flag)
871 {
872 int old_errno = errno; /* save errno because write might clobber it */
873
874 *flag = 1;
875
876 #if EV_USE_EVENTFD
877 if (evfd >= 0)
878 {
879 uint64_t counter = 1;
880 write (evfd, &counter, sizeof (uint64_t));
881 }
882 else
883 #endif
884 write (evpipe [1], &old_errno, 1);
885
886 errno = old_errno;
887 }
888 }
889
890 static void
891 pipecb (EV_P_ ev_io *iow, int revents)
892 {
893 #if EV_USE_EVENTFD
894 if (evfd >= 0)
895 {
896 uint64_t counter = 1;
897 read (evfd, &counter, sizeof (uint64_t));
898 }
899 else
900 #endif
901 {
902 char dummy;
903 read (evpipe [0], &dummy, 1);
904 }
905
906 if (gotsig && ev_is_default_loop (EV_A))
907 {
908 int signum;
909 gotsig = 0;
910
911 for (signum = signalmax; signum--; )
912 if (signals [signum].gotsig)
913 ev_feed_signal_event (EV_A_ signum + 1);
914 }
915
916 #if EV_ASYNC_ENABLE
917 if (gotasync)
918 {
919 int i;
920 gotasync = 0;
921
922 for (i = asynccnt; i--; )
923 if (asyncs [i]->sent)
924 {
925 asyncs [i]->sent = 0;
926 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
927 }
928 }
929 #endif
930 }
931
932 /*****************************************************************************/
933
934 static void
935 ev_sighandler (int signum)
936 {
937 #if EV_MULTIPLICITY
938 struct ev_loop *loop = &default_loop_struct;
939 #endif
940
941 #if _WIN32
942 signal (signum, ev_sighandler);
943 #endif
944
945 signals [signum - 1].gotsig = 1;
946 evpipe_write (EV_A_ &gotsig);
947 }
948
949 void noinline
950 ev_feed_signal_event (EV_P_ int signum)
951 {
952 WL w;
953
954 #if EV_MULTIPLICITY
955 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
956 #endif
957
958 --signum;
959
960 if (signum < 0 || signum >= signalmax)
961 return;
962
963 signals [signum].gotsig = 0;
964
965 for (w = signals [signum].head; w; w = w->next)
966 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
967 }
968
969 /*****************************************************************************/
970
971 static WL childs [EV_PID_HASHSIZE];
972
973 #ifndef _WIN32
974
975 static ev_signal childev;
976
977 #ifndef WIFCONTINUED
978 # define WIFCONTINUED(status) 0
979 #endif
980
981 void inline_speed
982 child_reap (EV_P_ int chain, int pid, int status)
983 {
984 ev_child *w;
985 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
986
987 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
988 {
989 if ((w->pid == pid || !w->pid)
990 && (!traced || (w->flags & 1)))
991 {
992 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
993 w->rpid = pid;
994 w->rstatus = status;
995 ev_feed_event (EV_A_ (W)w, EV_CHILD);
996 }
997 }
998 }
999
1000 #ifndef WCONTINUED
1001 # define WCONTINUED 0
1002 #endif
1003
1004 static void
1005 childcb (EV_P_ ev_signal *sw, int revents)
1006 {
1007 int pid, status;
1008
1009 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1010 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1011 if (!WCONTINUED
1012 || errno != EINVAL
1013 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1014 return;
1015
1016 /* make sure we are called again until all children have been reaped */
1017 /* we need to do it this way so that the callback gets called before we continue */
1018 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1019
1020 child_reap (EV_A_ pid, pid, status);
1021 if (EV_PID_HASHSIZE > 1)
1022 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1023 }
1024
1025 #endif
1026
1027 /*****************************************************************************/
1028
1029 #if EV_USE_PORT
1030 # include "ev_port.c"
1031 #endif
1032 #if EV_USE_KQUEUE
1033 # include "ev_kqueue.c"
1034 #endif
1035 #if EV_USE_EPOLL
1036 # include "ev_epoll.c"
1037 #endif
1038 #if EV_USE_POLL
1039 # include "ev_poll.c"
1040 #endif
1041 #if EV_USE_SELECT
1042 # include "ev_select.c"
1043 #endif
1044
1045 int
1046 ev_version_major (void)
1047 {
1048 return EV_VERSION_MAJOR;
1049 }
1050
1051 int
1052 ev_version_minor (void)
1053 {
1054 return EV_VERSION_MINOR;
1055 }
1056
1057 /* return true if we are running with elevated privileges and should ignore env variables */
1058 int inline_size
1059 enable_secure (void)
1060 {
1061 #ifdef _WIN32
1062 return 0;
1063 #else
1064 return getuid () != geteuid ()
1065 || getgid () != getegid ();
1066 #endif
1067 }
1068
1069 unsigned int
1070 ev_supported_backends (void)
1071 {
1072 unsigned int flags = 0;
1073
1074 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1075 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1076 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1077 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1078 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1079
1080 return flags;
1081 }
1082
1083 unsigned int
1084 ev_recommended_backends (void)
1085 {
1086 unsigned int flags = ev_supported_backends ();
1087
1088 #ifndef __NetBSD__
1089 /* kqueue is borked on everything but netbsd apparently */
1090 /* it usually doesn't work correctly on anything but sockets and pipes */
1091 flags &= ~EVBACKEND_KQUEUE;
1092 #endif
1093 #ifdef __APPLE__
1094 // flags &= ~EVBACKEND_KQUEUE; for documentation
1095 flags &= ~EVBACKEND_POLL;
1096 #endif
1097
1098 return flags;
1099 }
1100
1101 unsigned int
1102 ev_embeddable_backends (void)
1103 {
1104 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1105
1106 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1107 /* please fix it and tell me how to detect the fix */
1108 flags &= ~EVBACKEND_EPOLL;
1109
1110 return flags;
1111 }
1112
1113 unsigned int
1114 ev_backend (EV_P)
1115 {
1116 return backend;
1117 }
1118
1119 unsigned int
1120 ev_loop_count (EV_P)
1121 {
1122 return loop_count;
1123 }
1124
1125 void
1126 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1127 {
1128 io_blocktime = interval;
1129 }
1130
1131 void
1132 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1133 {
1134 timeout_blocktime = interval;
1135 }
1136
1137 static void noinline
1138 loop_init (EV_P_ unsigned int flags)
1139 {
1140 if (!backend)
1141 {
1142 #if EV_USE_MONOTONIC
1143 {
1144 struct timespec ts;
1145 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1146 have_monotonic = 1;
1147 }
1148 #endif
1149
1150 ev_rt_now = ev_time ();
1151 mn_now = get_clock ();
1152 now_floor = mn_now;
1153 rtmn_diff = ev_rt_now - mn_now;
1154
1155 io_blocktime = 0.;
1156 timeout_blocktime = 0.;
1157 backend = 0;
1158 backend_fd = -1;
1159 gotasync = 0;
1160 #if EV_USE_INOTIFY
1161 fs_fd = -2;
1162 #endif
1163
1164 /* pid check not overridable via env */
1165 #ifndef _WIN32
1166 if (flags & EVFLAG_FORKCHECK)
1167 curpid = getpid ();
1168 #endif
1169
1170 if (!(flags & EVFLAG_NOENV)
1171 && !enable_secure ()
1172 && getenv ("LIBEV_FLAGS"))
1173 flags = atoi (getenv ("LIBEV_FLAGS"));
1174
1175 if (!(flags & 0x0000ffffUL))
1176 flags |= ev_recommended_backends ();
1177
1178 #if EV_USE_PORT
1179 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1180 #endif
1181 #if EV_USE_KQUEUE
1182 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1183 #endif
1184 #if EV_USE_EPOLL
1185 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1186 #endif
1187 #if EV_USE_POLL
1188 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1189 #endif
1190 #if EV_USE_SELECT
1191 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1192 #endif
1193
1194 ev_init (&pipeev, pipecb);
1195 ev_set_priority (&pipeev, EV_MAXPRI);
1196 }
1197 }
1198
1199 static void noinline
1200 loop_destroy (EV_P)
1201 {
1202 int i;
1203
1204 if (ev_is_active (&pipeev))
1205 {
1206 ev_ref (EV_A); /* signal watcher */
1207 ev_io_stop (EV_A_ &pipeev);
1208
1209 #if EV_USE_EVENTFD
1210 if (evfd >= 0)
1211 close (evfd);
1212 #endif
1213
1214 if (evpipe [0] >= 0)
1215 {
1216 close (evpipe [0]);
1217 close (evpipe [1]);
1218 }
1219 }
1220
1221 #if EV_USE_INOTIFY
1222 if (fs_fd >= 0)
1223 close (fs_fd);
1224 #endif
1225
1226 if (backend_fd >= 0)
1227 close (backend_fd);
1228
1229 #if EV_USE_PORT
1230 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1231 #endif
1232 #if EV_USE_KQUEUE
1233 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1234 #endif
1235 #if EV_USE_EPOLL
1236 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1237 #endif
1238 #if EV_USE_POLL
1239 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1240 #endif
1241 #if EV_USE_SELECT
1242 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1243 #endif
1244
1245 for (i = NUMPRI; i--; )
1246 {
1247 array_free (pending, [i]);
1248 #if EV_IDLE_ENABLE
1249 array_free (idle, [i]);
1250 #endif
1251 }
1252
1253 ev_free (anfds); anfdmax = 0;
1254
1255 /* have to use the microsoft-never-gets-it-right macro */
1256 array_free (fdchange, EMPTY);
1257 array_free (timer, EMPTY);
1258 #if EV_PERIODIC_ENABLE
1259 array_free (periodic, EMPTY);
1260 #endif
1261 #if EV_FORK_ENABLE
1262 array_free (fork, EMPTY);
1263 #endif
1264 array_free (prepare, EMPTY);
1265 array_free (check, EMPTY);
1266 #if EV_ASYNC_ENABLE
1267 array_free (async, EMPTY);
1268 #endif
1269
1270 backend = 0;
1271 }
1272
1273 void inline_size infy_fork (EV_P);
1274
1275 void inline_size
1276 loop_fork (EV_P)
1277 {
1278 #if EV_USE_PORT
1279 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1280 #endif
1281 #if EV_USE_KQUEUE
1282 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1283 #endif
1284 #if EV_USE_EPOLL
1285 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1286 #endif
1287 #if EV_USE_INOTIFY
1288 infy_fork (EV_A);
1289 #endif
1290
1291 if (ev_is_active (&pipeev))
1292 {
1293 /* this "locks" the handlers against writing to the pipe */
1294 /* while we modify the fd vars */
1295 gotsig = 1;
1296 #if EV_ASYNC_ENABLE
1297 gotasync = 1;
1298 #endif
1299
1300 ev_ref (EV_A);
1301 ev_io_stop (EV_A_ &pipeev);
1302
1303 #if EV_USE_EVENTFD
1304 if (evfd >= 0)
1305 close (evfd);
1306 #endif
1307
1308 if (evpipe [0] >= 0)
1309 {
1310 close (evpipe [0]);
1311 close (evpipe [1]);
1312 }
1313
1314 evpipe_init (EV_A);
1315 /* now iterate over everything, in case we missed something */
1316 pipecb (EV_A_ &pipeev, EV_READ);
1317 }
1318
1319 postfork = 0;
1320 }
1321
1322 #if EV_MULTIPLICITY
1323 struct ev_loop *
1324 ev_loop_new (unsigned int flags)
1325 {
1326 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1327
1328 memset (loop, 0, sizeof (struct ev_loop));
1329
1330 loop_init (EV_A_ flags);
1331
1332 if (ev_backend (EV_A))
1333 return loop;
1334
1335 return 0;
1336 }
1337
1338 void
1339 ev_loop_destroy (EV_P)
1340 {
1341 loop_destroy (EV_A);
1342 ev_free (loop);
1343 }
1344
1345 void
1346 ev_loop_fork (EV_P)
1347 {
1348 postfork = 1; /* must be in line with ev_default_fork */
1349 }
1350
1351 #endif
1352
1353 #if EV_MULTIPLICITY
1354 struct ev_loop *
1355 ev_default_loop_init (unsigned int flags)
1356 #else
1357 int
1358 ev_default_loop (unsigned int flags)
1359 #endif
1360 {
1361 if (!ev_default_loop_ptr)
1362 {
1363 #if EV_MULTIPLICITY
1364 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1365 #else
1366 ev_default_loop_ptr = 1;
1367 #endif
1368
1369 loop_init (EV_A_ flags);
1370
1371 if (ev_backend (EV_A))
1372 {
1373 #ifndef _WIN32
1374 ev_signal_init (&childev, childcb, SIGCHLD);
1375 ev_set_priority (&childev, EV_MAXPRI);
1376 ev_signal_start (EV_A_ &childev);
1377 ev_unref (EV_A); /* child watcher should not keep loop alive */
1378 #endif
1379 }
1380 else
1381 ev_default_loop_ptr = 0;
1382 }
1383
1384 return ev_default_loop_ptr;
1385 }
1386
1387 void
1388 ev_default_destroy (void)
1389 {
1390 #if EV_MULTIPLICITY
1391 struct ev_loop *loop = ev_default_loop_ptr;
1392 #endif
1393
1394 #ifndef _WIN32
1395 ev_ref (EV_A); /* child watcher */
1396 ev_signal_stop (EV_A_ &childev);
1397 #endif
1398
1399 loop_destroy (EV_A);
1400 }
1401
1402 void
1403 ev_default_fork (void)
1404 {
1405 #if EV_MULTIPLICITY
1406 struct ev_loop *loop = ev_default_loop_ptr;
1407 #endif
1408
1409 if (backend)
1410 postfork = 1; /* must be in line with ev_loop_fork */
1411 }
1412
1413 /*****************************************************************************/
1414
1415 void
1416 ev_invoke (EV_P_ void *w, int revents)
1417 {
1418 EV_CB_INVOKE ((W)w, revents);
1419 }
1420
1421 void inline_speed
1422 call_pending (EV_P)
1423 {
1424 int pri;
1425
1426 for (pri = NUMPRI; pri--; )
1427 while (pendingcnt [pri])
1428 {
1429 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1430
1431 if (expect_true (p->w))
1432 {
1433 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1434
1435 p->w->pending = 0;
1436 EV_CB_INVOKE (p->w, p->events);
1437 }
1438 }
1439 }
1440
1441 void inline_size
1442 timers_reify (EV_P)
1443 {
1444 while (timercnt && ((WT)timers [0])->at <= mn_now)
1445 {
1446 ev_timer *w = (ev_timer *)timers [0];
1447
1448 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1449
1450 /* first reschedule or stop timer */
1451 if (w->repeat)
1452 {
1453 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1454
1455 ((WT)w)->at += w->repeat;
1456 if (((WT)w)->at < mn_now)
1457 ((WT)w)->at = mn_now;
1458
1459 downheap (timers, timercnt, 0);
1460 }
1461 else
1462 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1463
1464 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1465 }
1466 }
1467
1468 #if EV_PERIODIC_ENABLE
1469 void inline_size
1470 periodics_reify (EV_P)
1471 {
1472 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1473 {
1474 ev_periodic *w = (ev_periodic *)periodics [0];
1475
1476 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1477
1478 /* first reschedule or stop timer */
1479 if (w->reschedule_cb)
1480 {
1481 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1482 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1483 downheap (periodics, periodiccnt, 0);
1484 }
1485 else if (w->interval)
1486 {
1487 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1488 if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
1489 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1490 downheap (periodics, periodiccnt, 0);
1491 }
1492 else
1493 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1494
1495 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1496 }
1497 }
1498
1499 static void noinline
1500 periodics_reschedule (EV_P)
1501 {
1502 int i;
1503
1504 /* adjust periodics after time jump */
1505 for (i = 0; i < periodiccnt; ++i)
1506 {
1507 ev_periodic *w = (ev_periodic *)periodics [i];
1508
1509 if (w->reschedule_cb)
1510 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1511 else if (w->interval)
1512 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1513 }
1514
1515 /* now rebuild the heap */
1516 for (i = periodiccnt >> 1; i--; )
1517 downheap (periodics, periodiccnt, i);
1518 }
1519 #endif
1520
1521 #if EV_IDLE_ENABLE
1522 void inline_size
1523 idle_reify (EV_P)
1524 {
1525 if (expect_false (idleall))
1526 {
1527 int pri;
1528
1529 for (pri = NUMPRI; pri--; )
1530 {
1531 if (pendingcnt [pri])
1532 break;
1533
1534 if (idlecnt [pri])
1535 {
1536 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1537 break;
1538 }
1539 }
1540 }
1541 }
1542 #endif
1543
1544 void inline_speed
1545 time_update (EV_P_ ev_tstamp max_block)
1546 {
1547 int i;
1548
1549 #if EV_USE_MONOTONIC
1550 if (expect_true (have_monotonic))
1551 {
1552 ev_tstamp odiff = rtmn_diff;
1553
1554 mn_now = get_clock ();
1555
1556 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1557 /* interpolate in the meantime */
1558 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1559 {
1560 ev_rt_now = rtmn_diff + mn_now;
1561 return;
1562 }
1563
1564 now_floor = mn_now;
1565 ev_rt_now = ev_time ();
1566
1567 /* loop a few times, before making important decisions.
1568 * on the choice of "4": one iteration isn't enough,
1569 * in case we get preempted during the calls to
1570 * ev_time and get_clock. a second call is almost guaranteed
1571 * to succeed in that case, though. and looping a few more times
1572 * doesn't hurt either as we only do this on time-jumps or
1573 * in the unlikely event of having been preempted here.
1574 */
1575 for (i = 4; --i; )
1576 {
1577 rtmn_diff = ev_rt_now - mn_now;
1578
1579 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1580 return; /* all is well */
1581
1582 ev_rt_now = ev_time ();
1583 mn_now = get_clock ();
1584 now_floor = mn_now;
1585 }
1586
1587 # if EV_PERIODIC_ENABLE
1588 periodics_reschedule (EV_A);
1589 # endif
1590 /* no timer adjustment, as the monotonic clock doesn't jump */
1591 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1592 }
1593 else
1594 #endif
1595 {
1596 ev_rt_now = ev_time ();
1597
1598 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1599 {
1600 #if EV_PERIODIC_ENABLE
1601 periodics_reschedule (EV_A);
1602 #endif
1603 /* adjust timers. this is easy, as the offset is the same for all of them */
1604 for (i = 0; i < timercnt; ++i)
1605 ((WT)timers [i])->at += ev_rt_now - mn_now;
1606 }
1607
1608 mn_now = ev_rt_now;
1609 }
1610 }
1611
1612 void
1613 ev_ref (EV_P)
1614 {
1615 ++activecnt;
1616 }
1617
1618 void
1619 ev_unref (EV_P)
1620 {
1621 --activecnt;
1622 }
1623
1624 static int loop_done;
1625
1626 void
1627 ev_loop (EV_P_ int flags)
1628 {
1629 loop_done = EVUNLOOP_CANCEL;
1630
1631 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1632
1633 do
1634 {
1635 #ifndef _WIN32
1636 if (expect_false (curpid)) /* penalise the forking check even more */
1637 if (expect_false (getpid () != curpid))
1638 {
1639 curpid = getpid ();
1640 postfork = 1;
1641 }
1642 #endif
1643
1644 #if EV_FORK_ENABLE
1645 /* we might have forked, so queue fork handlers */
1646 if (expect_false (postfork))
1647 if (forkcnt)
1648 {
1649 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1650 call_pending (EV_A);
1651 }
1652 #endif
1653
1654 /* queue prepare watchers (and execute them) */
1655 if (expect_false (preparecnt))
1656 {
1657 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1658 call_pending (EV_A);
1659 }
1660
1661 if (expect_false (!activecnt))
1662 break;
1663
1664 /* we might have forked, so reify kernel state if necessary */
1665 if (expect_false (postfork))
1666 loop_fork (EV_A);
1667
1668 /* update fd-related kernel structures */
1669 fd_reify (EV_A);
1670
1671 /* calculate blocking time */
1672 {
1673 ev_tstamp waittime = 0.;
1674 ev_tstamp sleeptime = 0.;
1675
1676 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1677 {
1678 /* update time to cancel out callback processing overhead */
1679 time_update (EV_A_ 1e100);
1680
1681 waittime = MAX_BLOCKTIME;
1682
1683 if (timercnt)
1684 {
1685 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1686 if (waittime > to) waittime = to;
1687 }
1688
1689 #if EV_PERIODIC_ENABLE
1690 if (periodiccnt)
1691 {
1692 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1693 if (waittime > to) waittime = to;
1694 }
1695 #endif
1696
1697 if (expect_false (waittime < timeout_blocktime))
1698 waittime = timeout_blocktime;
1699
1700 sleeptime = waittime - backend_fudge;
1701
1702 if (expect_true (sleeptime > io_blocktime))
1703 sleeptime = io_blocktime;
1704
1705 if (sleeptime)
1706 {
1707 ev_sleep (sleeptime);
1708 waittime -= sleeptime;
1709 }
1710 }
1711
1712 ++loop_count;
1713 backend_poll (EV_A_ waittime);
1714
1715 /* update ev_rt_now, do magic */
1716 time_update (EV_A_ waittime + sleeptime);
1717 }
1718
1719 /* queue pending timers and reschedule them */
1720 timers_reify (EV_A); /* relative timers called last */
1721 #if EV_PERIODIC_ENABLE
1722 periodics_reify (EV_A); /* absolute timers called first */
1723 #endif
1724
1725 #if EV_IDLE_ENABLE
1726 /* queue idle watchers unless other events are pending */
1727 idle_reify (EV_A);
1728 #endif
1729
1730 /* queue check watchers, to be executed first */
1731 if (expect_false (checkcnt))
1732 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1733
1734 call_pending (EV_A);
1735 }
1736 while (expect_true (
1737 activecnt
1738 && !loop_done
1739 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
1740 ));
1741
1742 if (loop_done == EVUNLOOP_ONE)
1743 loop_done = EVUNLOOP_CANCEL;
1744 }
1745
1746 void
1747 ev_unloop (EV_P_ int how)
1748 {
1749 loop_done = how;
1750 }
1751
1752 /*****************************************************************************/
1753
1754 void inline_size
1755 wlist_add (WL *head, WL elem)
1756 {
1757 elem->next = *head;
1758 *head = elem;
1759 }
1760
1761 void inline_size
1762 wlist_del (WL *head, WL elem)
1763 {
1764 while (*head)
1765 {
1766 if (*head == elem)
1767 {
1768 *head = elem->next;
1769 return;
1770 }
1771
1772 head = &(*head)->next;
1773 }
1774 }
1775
1776 void inline_speed
1777 clear_pending (EV_P_ W w)
1778 {
1779 if (w->pending)
1780 {
1781 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1782 w->pending = 0;
1783 }
1784 }
1785
1786 int
1787 ev_clear_pending (EV_P_ void *w)
1788 {
1789 W w_ = (W)w;
1790 int pending = w_->pending;
1791
1792 if (expect_true (pending))
1793 {
1794 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1795 w_->pending = 0;
1796 p->w = 0;
1797 return p->events;
1798 }
1799 else
1800 return 0;
1801 }
1802
1803 void inline_size
1804 pri_adjust (EV_P_ W w)
1805 {
1806 int pri = w->priority;
1807 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1808 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1809 w->priority = pri;
1810 }
1811
1812 void inline_speed
1813 ev_start (EV_P_ W w, int active)
1814 {
1815 pri_adjust (EV_A_ w);
1816 w->active = active;
1817 ev_ref (EV_A);
1818 }
1819
1820 void inline_size
1821 ev_stop (EV_P_ W w)
1822 {
1823 ev_unref (EV_A);
1824 w->active = 0;
1825 }
1826
1827 /*****************************************************************************/
1828
1829 void noinline
1830 ev_io_start (EV_P_ ev_io *w)
1831 {
1832 int fd = w->fd;
1833
1834 if (expect_false (ev_is_active (w)))
1835 return;
1836
1837 assert (("ev_io_start called with negative fd", fd >= 0));
1838
1839 ev_start (EV_A_ (W)w, 1);
1840 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1841 wlist_add (&anfds[fd].head, (WL)w);
1842
1843 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1844 w->events &= ~EV_IOFDSET;
1845 }
1846
1847 void noinline
1848 ev_io_stop (EV_P_ ev_io *w)
1849 {
1850 clear_pending (EV_A_ (W)w);
1851 if (expect_false (!ev_is_active (w)))
1852 return;
1853
1854 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1855
1856 wlist_del (&anfds[w->fd].head, (WL)w);
1857 ev_stop (EV_A_ (W)w);
1858
1859 fd_change (EV_A_ w->fd, 1);
1860 }
1861
1862 void noinline
1863 ev_timer_start (EV_P_ ev_timer *w)
1864 {
1865 if (expect_false (ev_is_active (w)))
1866 return;
1867
1868 ((WT)w)->at += mn_now;
1869
1870 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1871
1872 ev_start (EV_A_ (W)w, ++timercnt);
1873 array_needsize (WT, timers, timermax, timercnt, EMPTY2);
1874 timers [timercnt - 1] = (WT)w;
1875 upheap (timers, timercnt - 1);
1876
1877 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1878 }
1879
1880 void noinline
1881 ev_timer_stop (EV_P_ ev_timer *w)
1882 {
1883 clear_pending (EV_A_ (W)w);
1884 if (expect_false (!ev_is_active (w)))
1885 return;
1886
1887 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
1888
1889 {
1890 int active = ((W)w)->active;
1891
1892 if (expect_true (--active < --timercnt))
1893 {
1894 timers [active] = timers [timercnt];
1895 adjustheap (timers, timercnt, active);
1896 }
1897 }
1898
1899 ((WT)w)->at -= mn_now;
1900
1901 ev_stop (EV_A_ (W)w);
1902 }
1903
1904 void noinline
1905 ev_timer_again (EV_P_ ev_timer *w)
1906 {
1907 if (ev_is_active (w))
1908 {
1909 if (w->repeat)
1910 {
1911 ((WT)w)->at = mn_now + w->repeat;
1912 adjustheap (timers, timercnt, ((W)w)->active - 1);
1913 }
1914 else
1915 ev_timer_stop (EV_A_ w);
1916 }
1917 else if (w->repeat)
1918 {
1919 w->at = w->repeat;
1920 ev_timer_start (EV_A_ w);
1921 }
1922 }
1923
1924 #if EV_PERIODIC_ENABLE
1925 void noinline
1926 ev_periodic_start (EV_P_ ev_periodic *w)
1927 {
1928 if (expect_false (ev_is_active (w)))
1929 return;
1930
1931 if (w->reschedule_cb)
1932 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1933 else if (w->interval)
1934 {
1935 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1936 /* this formula differs from the one in periodic_reify because we do not always round up */
1937 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1938 }
1939 else
1940 ((WT)w)->at = w->offset;
1941
1942 ev_start (EV_A_ (W)w, ++periodiccnt);
1943 array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
1944 periodics [periodiccnt - 1] = (WT)w;
1945 upheap (periodics, periodiccnt - 1);
1946
1947 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1948 }
1949
1950 void noinline
1951 ev_periodic_stop (EV_P_ ev_periodic *w)
1952 {
1953 clear_pending (EV_A_ (W)w);
1954 if (expect_false (!ev_is_active (w)))
1955 return;
1956
1957 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
1958
1959 {
1960 int active = ((W)w)->active;
1961
1962 if (expect_true (--active < --periodiccnt))
1963 {
1964 periodics [active] = periodics [periodiccnt];
1965 adjustheap (periodics, periodiccnt, active);
1966 }
1967 }
1968
1969 ev_stop (EV_A_ (W)w);
1970 }
1971
1972 void noinline
1973 ev_periodic_again (EV_P_ ev_periodic *w)
1974 {
1975 /* TODO: use adjustheap and recalculation */
1976 ev_periodic_stop (EV_A_ w);
1977 ev_periodic_start (EV_A_ w);
1978 }
1979 #endif
1980
1981 #ifndef SA_RESTART
1982 # define SA_RESTART 0
1983 #endif
1984
1985 void noinline
1986 ev_signal_start (EV_P_ ev_signal *w)
1987 {
1988 #if EV_MULTIPLICITY
1989 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1990 #endif
1991 if (expect_false (ev_is_active (w)))
1992 return;
1993
1994 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1995
1996 evpipe_init (EV_A);
1997
1998 {
1999 #ifndef _WIN32
2000 sigset_t full, prev;
2001 sigfillset (&full);
2002 sigprocmask (SIG_SETMASK, &full, &prev);
2003 #endif
2004
2005 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2006
2007 #ifndef _WIN32
2008 sigprocmask (SIG_SETMASK, &prev, 0);
2009 #endif
2010 }
2011
2012 ev_start (EV_A_ (W)w, 1);
2013 wlist_add (&signals [w->signum - 1].head, (WL)w);
2014
2015 if (!((WL)w)->next)
2016 {
2017 #if _WIN32
2018 signal (w->signum, ev_sighandler);
2019 #else
2020 struct sigaction sa;
2021 sa.sa_handler = ev_sighandler;
2022 sigfillset (&sa.sa_mask);
2023 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2024 sigaction (w->signum, &sa, 0);
2025 #endif
2026 }
2027 }
2028
2029 void noinline
2030 ev_signal_stop (EV_P_ ev_signal *w)
2031 {
2032 clear_pending (EV_A_ (W)w);
2033 if (expect_false (!ev_is_active (w)))
2034 return;
2035
2036 wlist_del (&signals [w->signum - 1].head, (WL)w);
2037 ev_stop (EV_A_ (W)w);
2038
2039 if (!signals [w->signum - 1].head)
2040 signal (w->signum, SIG_DFL);
2041 }
2042
2043 void
2044 ev_child_start (EV_P_ ev_child *w)
2045 {
2046 #if EV_MULTIPLICITY
2047 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2048 #endif
2049 if (expect_false (ev_is_active (w)))
2050 return;
2051
2052 ev_start (EV_A_ (W)w, 1);
2053 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2054 }
2055
2056 void
2057 ev_child_stop (EV_P_ ev_child *w)
2058 {
2059 clear_pending (EV_A_ (W)w);
2060 if (expect_false (!ev_is_active (w)))
2061 return;
2062
2063 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2064 ev_stop (EV_A_ (W)w);
2065 }
2066
2067 #if EV_STAT_ENABLE
2068
2069 # ifdef _WIN32
2070 # undef lstat
2071 # define lstat(a,b) _stati64 (a,b)
2072 # endif
2073
2074 #define DEF_STAT_INTERVAL 5.0074891
2075 #define MIN_STAT_INTERVAL 0.1074891
2076
2077 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2078
2079 #if EV_USE_INOTIFY
2080 # define EV_INOTIFY_BUFSIZE 8192
2081
2082 static void noinline
2083 infy_add (EV_P_ ev_stat *w)
2084 {
2085 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);
2086
2087 if (w->wd < 0)
2088 {
2089 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2090
2091 /* monitor some parent directory for speedup hints */
2092 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2093 {
2094 char path [4096];
2095 strcpy (path, w->path);
2096
2097 do
2098 {
2099 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2100 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2101
2102 char *pend = strrchr (path, '/');
2103
2104 if (!pend)
2105 break; /* whoops, no '/', complain to your admin */
2106
2107 *pend = 0;
2108 w->wd = inotify_add_watch (fs_fd, path, mask);
2109 }
2110 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2111 }
2112 }
2113 else
2114 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2115
2116 if (w->wd >= 0)
2117 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2118 }
2119
2120 static void noinline
2121 infy_del (EV_P_ ev_stat *w)
2122 {
2123 int slot;
2124 int wd = w->wd;
2125
2126 if (wd < 0)
2127 return;
2128
2129 w->wd = -2;
2130 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2131 wlist_del (&fs_hash [slot].head, (WL)w);
2132
2133 /* remove this watcher, if others are watching it, they will rearm */
2134 inotify_rm_watch (fs_fd, wd);
2135 }
2136
2137 static void noinline
2138 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2139 {
2140 if (slot < 0)
2141 /* overflow, need to check for all hahs slots */
2142 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2143 infy_wd (EV_A_ slot, wd, ev);
2144 else
2145 {
2146 WL w_;
2147
2148 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2149 {
2150 ev_stat *w = (ev_stat *)w_;
2151 w_ = w_->next; /* lets us remove this watcher and all before it */
2152
2153 if (w->wd == wd || wd == -1)
2154 {
2155 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2156 {
2157 w->wd = -1;
2158 infy_add (EV_A_ w); /* re-add, no matter what */
2159 }
2160
2161 stat_timer_cb (EV_A_ &w->timer, 0);
2162 }
2163 }
2164 }
2165 }
2166
2167 static void
2168 infy_cb (EV_P_ ev_io *w, int revents)
2169 {
2170 char buf [EV_INOTIFY_BUFSIZE];
2171 struct inotify_event *ev = (struct inotify_event *)buf;
2172 int ofs;
2173 int len = read (fs_fd, buf, sizeof (buf));
2174
2175 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2176 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2177 }
2178
2179 void inline_size
2180 infy_init (EV_P)
2181 {
2182 if (fs_fd != -2)
2183 return;
2184
2185 fs_fd = inotify_init ();
2186
2187 if (fs_fd >= 0)
2188 {
2189 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2190 ev_set_priority (&fs_w, EV_MAXPRI);
2191 ev_io_start (EV_A_ &fs_w);
2192 }
2193 }
2194
2195 void inline_size
2196 infy_fork (EV_P)
2197 {
2198 int slot;
2199
2200 if (fs_fd < 0)
2201 return;
2202
2203 close (fs_fd);
2204 fs_fd = inotify_init ();
2205
2206 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2207 {
2208 WL w_ = fs_hash [slot].head;
2209 fs_hash [slot].head = 0;
2210
2211 while (w_)
2212 {
2213 ev_stat *w = (ev_stat *)w_;
2214 w_ = w_->next; /* lets us add this watcher */
2215
2216 w->wd = -1;
2217
2218 if (fs_fd >= 0)
2219 infy_add (EV_A_ w); /* re-add, no matter what */
2220 else
2221 ev_timer_start (EV_A_ &w->timer);
2222 }
2223
2224 }
2225 }
2226
2227 #endif
2228
2229 void
2230 ev_stat_stat (EV_P_ ev_stat *w)
2231 {
2232 if (lstat (w->path, &w->attr) < 0)
2233 w->attr.st_nlink = 0;
2234 else if (!w->attr.st_nlink)
2235 w->attr.st_nlink = 1;
2236 }
2237
2238 static void noinline
2239 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2240 {
2241 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2242
2243 /* we copy this here each the time so that */
2244 /* prev has the old value when the callback gets invoked */
2245 w->prev = w->attr;
2246 ev_stat_stat (EV_A_ w);
2247
2248 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2249 if (
2250 w->prev.st_dev != w->attr.st_dev
2251 || w->prev.st_ino != w->attr.st_ino
2252 || w->prev.st_mode != w->attr.st_mode
2253 || w->prev.st_nlink != w->attr.st_nlink
2254 || w->prev.st_uid != w->attr.st_uid
2255 || w->prev.st_gid != w->attr.st_gid
2256 || w->prev.st_rdev != w->attr.st_rdev
2257 || w->prev.st_size != w->attr.st_size
2258 || w->prev.st_atime != w->attr.st_atime
2259 || w->prev.st_mtime != w->attr.st_mtime
2260 || w->prev.st_ctime != w->attr.st_ctime
2261 ) {
2262 #if EV_USE_INOTIFY
2263 infy_del (EV_A_ w);
2264 infy_add (EV_A_ w);
2265 ev_stat_stat (EV_A_ w); /* avoid race... */
2266 #endif
2267
2268 ev_feed_event (EV_A_ w, EV_STAT);
2269 }
2270 }
2271
2272 void
2273 ev_stat_start (EV_P_ ev_stat *w)
2274 {
2275 if (expect_false (ev_is_active (w)))
2276 return;
2277
2278 /* since we use memcmp, we need to clear any padding data etc. */
2279 memset (&w->prev, 0, sizeof (ev_statdata));
2280 memset (&w->attr, 0, sizeof (ev_statdata));
2281
2282 ev_stat_stat (EV_A_ w);
2283
2284 if (w->interval < MIN_STAT_INTERVAL)
2285 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2286
2287 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2288 ev_set_priority (&w->timer, ev_priority (w));
2289
2290 #if EV_USE_INOTIFY
2291 infy_init (EV_A);
2292
2293 if (fs_fd >= 0)
2294 infy_add (EV_A_ w);
2295 else
2296 #endif
2297 ev_timer_start (EV_A_ &w->timer);
2298
2299 ev_start (EV_A_ (W)w, 1);
2300 }
2301
2302 void
2303 ev_stat_stop (EV_P_ ev_stat *w)
2304 {
2305 clear_pending (EV_A_ (W)w);
2306 if (expect_false (!ev_is_active (w)))
2307 return;
2308
2309 #if EV_USE_INOTIFY
2310 infy_del (EV_A_ w);
2311 #endif
2312 ev_timer_stop (EV_A_ &w->timer);
2313
2314 ev_stop (EV_A_ (W)w);
2315 }
2316 #endif
2317
2318 #if EV_IDLE_ENABLE
2319 void
2320 ev_idle_start (EV_P_ ev_idle *w)
2321 {
2322 if (expect_false (ev_is_active (w)))
2323 return;
2324
2325 pri_adjust (EV_A_ (W)w);
2326
2327 {
2328 int active = ++idlecnt [ABSPRI (w)];
2329
2330 ++idleall;
2331 ev_start (EV_A_ (W)w, active);
2332
2333 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2334 idles [ABSPRI (w)][active - 1] = w;
2335 }
2336 }
2337
2338 void
2339 ev_idle_stop (EV_P_ ev_idle *w)
2340 {
2341 clear_pending (EV_A_ (W)w);
2342 if (expect_false (!ev_is_active (w)))
2343 return;
2344
2345 {
2346 int active = ((W)w)->active;
2347
2348 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2349 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2350
2351 ev_stop (EV_A_ (W)w);
2352 --idleall;
2353 }
2354 }
2355 #endif
2356
2357 void
2358 ev_prepare_start (EV_P_ ev_prepare *w)
2359 {
2360 if (expect_false (ev_is_active (w)))
2361 return;
2362
2363 ev_start (EV_A_ (W)w, ++preparecnt);
2364 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2365 prepares [preparecnt - 1] = w;
2366 }
2367
2368 void
2369 ev_prepare_stop (EV_P_ ev_prepare *w)
2370 {
2371 clear_pending (EV_A_ (W)w);
2372 if (expect_false (!ev_is_active (w)))
2373 return;
2374
2375 {
2376 int active = ((W)w)->active;
2377 prepares [active - 1] = prepares [--preparecnt];
2378 ((W)prepares [active - 1])->active = active;
2379 }
2380
2381 ev_stop (EV_A_ (W)w);
2382 }
2383
2384 void
2385 ev_check_start (EV_P_ ev_check *w)
2386 {
2387 if (expect_false (ev_is_active (w)))
2388 return;
2389
2390 ev_start (EV_A_ (W)w, ++checkcnt);
2391 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2392 checks [checkcnt - 1] = w;
2393 }
2394
2395 void
2396 ev_check_stop (EV_P_ ev_check *w)
2397 {
2398 clear_pending (EV_A_ (W)w);
2399 if (expect_false (!ev_is_active (w)))
2400 return;
2401
2402 {
2403 int active = ((W)w)->active;
2404 checks [active - 1] = checks [--checkcnt];
2405 ((W)checks [active - 1])->active = active;
2406 }
2407
2408 ev_stop (EV_A_ (W)w);
2409 }
2410
2411 #if EV_EMBED_ENABLE
2412 void noinline
2413 ev_embed_sweep (EV_P_ ev_embed *w)
2414 {
2415 ev_loop (w->other, EVLOOP_NONBLOCK);
2416 }
2417
2418 static void
2419 embed_io_cb (EV_P_ ev_io *io, int revents)
2420 {
2421 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2422
2423 if (ev_cb (w))
2424 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2425 else
2426 ev_loop (w->other, EVLOOP_NONBLOCK);
2427 }
2428
2429 static void
2430 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2431 {
2432 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2433
2434 {
2435 struct ev_loop *loop = w->other;
2436
2437 while (fdchangecnt)
2438 {
2439 fd_reify (EV_A);
2440 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2441 }
2442 }
2443 }
2444
2445 #if 0
2446 static void
2447 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2448 {
2449 ev_idle_stop (EV_A_ idle);
2450 }
2451 #endif
2452
2453 void
2454 ev_embed_start (EV_P_ ev_embed *w)
2455 {
2456 if (expect_false (ev_is_active (w)))
2457 return;
2458
2459 {
2460 struct ev_loop *loop = w->other;
2461 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2462 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2463 }
2464
2465 ev_set_priority (&w->io, ev_priority (w));
2466 ev_io_start (EV_A_ &w->io);
2467
2468 ev_prepare_init (&w->prepare, embed_prepare_cb);
2469 ev_set_priority (&w->prepare, EV_MINPRI);
2470 ev_prepare_start (EV_A_ &w->prepare);
2471
2472 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2473
2474 ev_start (EV_A_ (W)w, 1);
2475 }
2476
2477 void
2478 ev_embed_stop (EV_P_ ev_embed *w)
2479 {
2480 clear_pending (EV_A_ (W)w);
2481 if (expect_false (!ev_is_active (w)))
2482 return;
2483
2484 ev_io_stop (EV_A_ &w->io);
2485 ev_prepare_stop (EV_A_ &w->prepare);
2486
2487 ev_stop (EV_A_ (W)w);
2488 }
2489 #endif
2490
2491 #if EV_FORK_ENABLE
2492 void
2493 ev_fork_start (EV_P_ ev_fork *w)
2494 {
2495 if (expect_false (ev_is_active (w)))
2496 return;
2497
2498 ev_start (EV_A_ (W)w, ++forkcnt);
2499 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2500 forks [forkcnt - 1] = w;
2501 }
2502
2503 void
2504 ev_fork_stop (EV_P_ ev_fork *w)
2505 {
2506 clear_pending (EV_A_ (W)w);
2507 if (expect_false (!ev_is_active (w)))
2508 return;
2509
2510 {
2511 int active = ((W)w)->active;
2512 forks [active - 1] = forks [--forkcnt];
2513 ((W)forks [active - 1])->active = active;
2514 }
2515
2516 ev_stop (EV_A_ (W)w);
2517 }
2518 #endif
2519
2520 #if EV_ASYNC_ENABLE
2521 void
2522 ev_async_start (EV_P_ ev_async *w)
2523 {
2524 if (expect_false (ev_is_active (w)))
2525 return;
2526
2527 evpipe_init (EV_A);
2528
2529 ev_start (EV_A_ (W)w, ++asynccnt);
2530 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2531 asyncs [asynccnt - 1] = w;
2532 }
2533
2534 void
2535 ev_async_stop (EV_P_ ev_async *w)
2536 {
2537 clear_pending (EV_A_ (W)w);
2538 if (expect_false (!ev_is_active (w)))
2539 return;
2540
2541 {
2542 int active = ((W)w)->active;
2543 asyncs [active - 1] = asyncs [--asynccnt];
2544 ((W)asyncs [active - 1])->active = active;
2545 }
2546
2547 ev_stop (EV_A_ (W)w);
2548 }
2549
2550 void
2551 ev_async_send (EV_P_ ev_async *w)
2552 {
2553 w->sent = 1;
2554 evpipe_write (EV_A_ &gotasync);
2555 }
2556 #endif
2557
2558 /*****************************************************************************/
2559
2560 struct ev_once
2561 {
2562 ev_io io;
2563 ev_timer to;
2564 void (*cb)(int revents, void *arg);
2565 void *arg;
2566 };
2567
2568 static void
2569 once_cb (EV_P_ struct ev_once *once, int revents)
2570 {
2571 void (*cb)(int revents, void *arg) = once->cb;
2572 void *arg = once->arg;
2573
2574 ev_io_stop (EV_A_ &once->io);
2575 ev_timer_stop (EV_A_ &once->to);
2576 ev_free (once);
2577
2578 cb (revents, arg);
2579 }
2580
2581 static void
2582 once_cb_io (EV_P_ ev_io *w, int revents)
2583 {
2584 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2585 }
2586
2587 static void
2588 once_cb_to (EV_P_ ev_timer *w, int revents)
2589 {
2590 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2591 }
2592
2593 void
2594 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2595 {
2596 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2597
2598 if (expect_false (!once))
2599 {
2600 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2601 return;
2602 }
2603
2604 once->cb = cb;
2605 once->arg = arg;
2606
2607 ev_init (&once->io, once_cb_io);
2608 if (fd >= 0)
2609 {
2610 ev_io_set (&once->io, fd, events);
2611 ev_io_start (EV_A_ &once->io);
2612 }
2613
2614 ev_init (&once->to, once_cb_to);
2615 if (timeout >= 0.)
2616 {
2617 ev_timer_set (&once->to, timeout, 0.);
2618 ev_timer_start (EV_A_ &once->to);
2619 }
2620 }
2621
2622 #if EV_MULTIPLICITY
2623 #include "ev_wrap.h"
2624 #endif
2625
2626 #ifdef __cplusplus
2627 }
2628 #endif
2629