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Revision: 1.220
Committed: Sun Apr 6 09:53:17 2008 UTC (16 years, 3 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.219: +93 -18 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 int eventfd (unsigned int initval, int flags);
274 #endif
275
276 /**/
277
278 /*
279 * This is used to avoid floating point rounding problems.
280 * It is added to ev_rt_now when scheduling periodics
281 * to ensure progress, time-wise, even when rounding
282 * errors are against us.
283 * This value is good at least till the year 4000.
284 * Better solutions welcome.
285 */
286 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
287
288 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
289 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
290 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
291
292 #if __GNUC__ >= 4
293 # define expect(expr,value) __builtin_expect ((expr),(value))
294 # define noinline __attribute__ ((noinline))
295 #else
296 # define expect(expr,value) (expr)
297 # define noinline
298 # if __STDC_VERSION__ < 199901L
299 # define inline
300 # endif
301 #endif
302
303 #define expect_false(expr) expect ((expr) != 0, 0)
304 #define expect_true(expr) expect ((expr) != 0, 1)
305 #define inline_size static inline
306
307 #if EV_MINIMAL
308 # define inline_speed static noinline
309 #else
310 # define inline_speed static inline
311 #endif
312
313 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
314 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
315
316 #define EMPTY /* required for microsofts broken pseudo-c compiler */
317 #define EMPTY2(a,b) /* used to suppress some warnings */
318
319 typedef ev_watcher *W;
320 typedef ev_watcher_list *WL;
321 typedef ev_watcher_time *WT;
322
323 #if EV_USE_MONOTONIC
324 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
325 /* giving it a reasonably high chance of working on typical architetcures */
326 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
327 #endif
328
329 #ifdef _WIN32
330 # include "ev_win32.c"
331 #endif
332
333 /*****************************************************************************/
334
335 static void (*syserr_cb)(const char *msg);
336
337 void
338 ev_set_syserr_cb (void (*cb)(const char *msg))
339 {
340 syserr_cb = cb;
341 }
342
343 static void noinline
344 syserr (const char *msg)
345 {
346 if (!msg)
347 msg = "(libev) system error";
348
349 if (syserr_cb)
350 syserr_cb (msg);
351 else
352 {
353 perror (msg);
354 abort ();
355 }
356 }
357
358 static void *(*alloc)(void *ptr, long size);
359
360 void
361 ev_set_allocator (void *(*cb)(void *ptr, long size))
362 {
363 alloc = cb;
364 }
365
366 inline_speed void *
367 ev_realloc (void *ptr, long size)
368 {
369 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
370
371 if (!ptr && size)
372 {
373 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
374 abort ();
375 }
376
377 return ptr;
378 }
379
380 #define ev_malloc(size) ev_realloc (0, (size))
381 #define ev_free(ptr) ev_realloc ((ptr), 0)
382
383 /*****************************************************************************/
384
385 typedef struct
386 {
387 WL head;
388 unsigned char events;
389 unsigned char reify;
390 #if EV_SELECT_IS_WINSOCKET
391 SOCKET handle;
392 #endif
393 } ANFD;
394
395 typedef struct
396 {
397 W w;
398 int events;
399 } ANPENDING;
400
401 #if EV_USE_INOTIFY
402 typedef struct
403 {
404 WL head;
405 } ANFS;
406 #endif
407
408 #if EV_MULTIPLICITY
409
410 struct ev_loop
411 {
412 ev_tstamp ev_rt_now;
413 #define ev_rt_now ((loop)->ev_rt_now)
414 #define VAR(name,decl) decl;
415 #include "ev_vars.h"
416 #undef VAR
417 };
418 #include "ev_wrap.h"
419
420 static struct ev_loop default_loop_struct;
421 struct ev_loop *ev_default_loop_ptr;
422
423 #else
424
425 ev_tstamp ev_rt_now;
426 #define VAR(name,decl) static decl;
427 #include "ev_vars.h"
428 #undef VAR
429
430 static int ev_default_loop_ptr;
431
432 #endif
433
434 /*****************************************************************************/
435
436 ev_tstamp
437 ev_time (void)
438 {
439 #if EV_USE_REALTIME
440 struct timespec ts;
441 clock_gettime (CLOCK_REALTIME, &ts);
442 return ts.tv_sec + ts.tv_nsec * 1e-9;
443 #else
444 struct timeval tv;
445 gettimeofday (&tv, 0);
446 return tv.tv_sec + tv.tv_usec * 1e-6;
447 #endif
448 }
449
450 ev_tstamp inline_size
451 get_clock (void)
452 {
453 #if EV_USE_MONOTONIC
454 if (expect_true (have_monotonic))
455 {
456 struct timespec ts;
457 clock_gettime (CLOCK_MONOTONIC, &ts);
458 return ts.tv_sec + ts.tv_nsec * 1e-9;
459 }
460 #endif
461
462 return ev_time ();
463 }
464
465 #if EV_MULTIPLICITY
466 ev_tstamp
467 ev_now (EV_P)
468 {
469 return ev_rt_now;
470 }
471 #endif
472
473 void
474 ev_sleep (ev_tstamp delay)
475 {
476 if (delay > 0.)
477 {
478 #if EV_USE_NANOSLEEP
479 struct timespec ts;
480
481 ts.tv_sec = (time_t)delay;
482 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
483
484 nanosleep (&ts, 0);
485 #elif defined(_WIN32)
486 Sleep ((unsigned long)(delay * 1e3));
487 #else
488 struct timeval tv;
489
490 tv.tv_sec = (time_t)delay;
491 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
492
493 select (0, 0, 0, 0, &tv);
494 #endif
495 }
496 }
497
498 /*****************************************************************************/
499
500 int inline_size
501 array_nextsize (int elem, int cur, int cnt)
502 {
503 int ncur = cur + 1;
504
505 do
506 ncur <<= 1;
507 while (cnt > ncur);
508
509 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
510 if (elem * ncur > 4096)
511 {
512 ncur *= elem;
513 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
514 ncur = ncur - sizeof (void *) * 4;
515 ncur /= elem;
516 }
517
518 return ncur;
519 }
520
521 static noinline void *
522 array_realloc (int elem, void *base, int *cur, int cnt)
523 {
524 *cur = array_nextsize (elem, *cur, cnt);
525 return ev_realloc (base, elem * *cur);
526 }
527
528 #define array_needsize(type,base,cur,cnt,init) \
529 if (expect_false ((cnt) > (cur))) \
530 { \
531 int ocur_ = (cur); \
532 (base) = (type *)array_realloc \
533 (sizeof (type), (base), &(cur), (cnt)); \
534 init ((base) + (ocur_), (cur) - ocur_); \
535 }
536
537 #if 0
538 #define array_slim(type,stem) \
539 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
540 { \
541 stem ## max = array_roundsize (stem ## cnt >> 1); \
542 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
543 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
544 }
545 #endif
546
547 #define array_free(stem, idx) \
548 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
549
550 /*****************************************************************************/
551
552 void noinline
553 ev_feed_event (EV_P_ void *w, int revents)
554 {
555 W w_ = (W)w;
556 int pri = ABSPRI (w_);
557
558 if (expect_false (w_->pending))
559 pendings [pri][w_->pending - 1].events |= revents;
560 else
561 {
562 w_->pending = ++pendingcnt [pri];
563 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
564 pendings [pri][w_->pending - 1].w = w_;
565 pendings [pri][w_->pending - 1].events = revents;
566 }
567 }
568
569 void inline_speed
570 queue_events (EV_P_ W *events, int eventcnt, int type)
571 {
572 int i;
573
574 for (i = 0; i < eventcnt; ++i)
575 ev_feed_event (EV_A_ events [i], type);
576 }
577
578 /*****************************************************************************/
579
580 void inline_size
581 anfds_init (ANFD *base, int count)
582 {
583 while (count--)
584 {
585 base->head = 0;
586 base->events = EV_NONE;
587 base->reify = 0;
588
589 ++base;
590 }
591 }
592
593 void inline_speed
594 fd_event (EV_P_ int fd, int revents)
595 {
596 ANFD *anfd = anfds + fd;
597 ev_io *w;
598
599 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
600 {
601 int ev = w->events & revents;
602
603 if (ev)
604 ev_feed_event (EV_A_ (W)w, ev);
605 }
606 }
607
608 void
609 ev_feed_fd_event (EV_P_ int fd, int revents)
610 {
611 if (fd >= 0 && fd < anfdmax)
612 fd_event (EV_A_ fd, revents);
613 }
614
615 void inline_size
616 fd_reify (EV_P)
617 {
618 int i;
619
620 for (i = 0; i < fdchangecnt; ++i)
621 {
622 int fd = fdchanges [i];
623 ANFD *anfd = anfds + fd;
624 ev_io *w;
625
626 unsigned char events = 0;
627
628 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
629 events |= (unsigned char)w->events;
630
631 #if EV_SELECT_IS_WINSOCKET
632 if (events)
633 {
634 unsigned long argp;
635 #ifdef EV_FD_TO_WIN32_HANDLE
636 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
637 #else
638 anfd->handle = _get_osfhandle (fd);
639 #endif
640 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
641 }
642 #endif
643
644 {
645 unsigned char o_events = anfd->events;
646 unsigned char o_reify = anfd->reify;
647
648 anfd->reify = 0;
649 anfd->events = events;
650
651 if (o_events != events || o_reify & EV_IOFDSET)
652 backend_modify (EV_A_ fd, o_events, events);
653 }
654 }
655
656 fdchangecnt = 0;
657 }
658
659 void inline_size
660 fd_change (EV_P_ int fd, int flags)
661 {
662 unsigned char reify = anfds [fd].reify;
663 anfds [fd].reify |= flags;
664
665 if (expect_true (!reify))
666 {
667 ++fdchangecnt;
668 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
669 fdchanges [fdchangecnt - 1] = fd;
670 }
671 }
672
673 void inline_speed
674 fd_kill (EV_P_ int fd)
675 {
676 ev_io *w;
677
678 while ((w = (ev_io *)anfds [fd].head))
679 {
680 ev_io_stop (EV_A_ w);
681 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
682 }
683 }
684
685 int inline_size
686 fd_valid (int fd)
687 {
688 #ifdef _WIN32
689 return _get_osfhandle (fd) != -1;
690 #else
691 return fcntl (fd, F_GETFD) != -1;
692 #endif
693 }
694
695 /* called on EBADF to verify fds */
696 static void noinline
697 fd_ebadf (EV_P)
698 {
699 int fd;
700
701 for (fd = 0; fd < anfdmax; ++fd)
702 if (anfds [fd].events)
703 if (!fd_valid (fd) == -1 && errno == EBADF)
704 fd_kill (EV_A_ fd);
705 }
706
707 /* called on ENOMEM in select/poll to kill some fds and retry */
708 static void noinline
709 fd_enomem (EV_P)
710 {
711 int fd;
712
713 for (fd = anfdmax; fd--; )
714 if (anfds [fd].events)
715 {
716 fd_kill (EV_A_ fd);
717 return;
718 }
719 }
720
721 /* usually called after fork if backend needs to re-arm all fds from scratch */
722 static void noinline
723 fd_rearm_all (EV_P)
724 {
725 int fd;
726
727 for (fd = 0; fd < anfdmax; ++fd)
728 if (anfds [fd].events)
729 {
730 anfds [fd].events = 0;
731 fd_change (EV_A_ fd, EV_IOFDSET | 1);
732 }
733 }
734
735 /*****************************************************************************/
736
737 void inline_speed
738 upheap (WT *heap, int k)
739 {
740 WT w = heap [k];
741
742 while (k)
743 {
744 int p = (k - 1) >> 1;
745
746 if (heap [p]->at <= w->at)
747 break;
748
749 heap [k] = heap [p];
750 ((W)heap [k])->active = k + 1;
751 k = p;
752 }
753
754 heap [k] = w;
755 ((W)heap [k])->active = k + 1;
756 }
757
758 void inline_speed
759 downheap (WT *heap, int N, int k)
760 {
761 WT w = heap [k];
762
763 for (;;)
764 {
765 int c = (k << 1) + 1;
766
767 if (c >= N)
768 break;
769
770 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
771 ? 1 : 0;
772
773 if (w->at <= heap [c]->at)
774 break;
775
776 heap [k] = heap [c];
777 ((W)heap [k])->active = k + 1;
778
779 k = c;
780 }
781
782 heap [k] = w;
783 ((W)heap [k])->active = k + 1;
784 }
785
786 void inline_size
787 adjustheap (WT *heap, int N, int k)
788 {
789 upheap (heap, k);
790 downheap (heap, N, k);
791 }
792
793 /*****************************************************************************/
794
795 typedef struct
796 {
797 WL head;
798 EV_ATOMIC_T gotsig;
799 } ANSIG;
800
801 static ANSIG *signals;
802 static int signalmax;
803
804 static EV_ATOMIC_T gotsig;
805
806 void inline_size
807 signals_init (ANSIG *base, int count)
808 {
809 while (count--)
810 {
811 base->head = 0;
812 base->gotsig = 0;
813
814 ++base;
815 }
816 }
817
818 /*****************************************************************************/
819
820 void inline_speed
821 fd_intern (int fd)
822 {
823 #ifdef _WIN32
824 int arg = 1;
825 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
826 #else
827 fcntl (fd, F_SETFD, FD_CLOEXEC);
828 fcntl (fd, F_SETFL, O_NONBLOCK);
829 #endif
830 }
831
832 static void noinline
833 evpipe_init (EV_P)
834 {
835 if (!ev_is_active (&pipeev))
836 {
837 #if EV_USE_EVENTFD
838 if ((evfd = eventfd (0, 0)) >= 0)
839 {
840 evpipe [0] = -1;
841 fd_intern (evfd);
842 ev_io_set (&pipeev, evfd, EV_READ);
843 }
844 else
845 #endif
846 {
847 while (pipe (evpipe))
848 syserr ("(libev) error creating signal/async pipe");
849
850 fd_intern (evpipe [0]);
851 fd_intern (evpipe [1]);
852 ev_io_set (&pipeev, evpipe [0], EV_READ);
853 }
854
855 ev_io_start (EV_A_ &pipeev);
856 ev_unref (EV_A); /* watcher should not keep loop alive */
857 }
858 }
859
860 void inline_size
861 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
862 {
863 if (!*flag)
864 {
865 int old_errno = errno; /* save errno because write might clobber it */
866
867 *flag = 1;
868
869 #if EV_USE_EVENTFD
870 if (evfd >= 0)
871 {
872 uint64_t counter = 1;
873 write (evfd, &counter, sizeof (uint64_t));
874 }
875 else
876 #endif
877 write (evpipe [1], &old_errno, 1);
878
879 errno = old_errno;
880 }
881 }
882
883 static void
884 pipecb (EV_P_ ev_io *iow, int revents)
885 {
886 #if EV_USE_EVENTFD
887 if (evfd >= 0)
888 {
889 uint64_t counter = 1;
890 read (evfd, &counter, sizeof (uint64_t));
891 }
892 else
893 #endif
894 {
895 char dummy;
896 read (evpipe [0], &dummy, 1);
897 }
898
899 if (gotsig && ev_is_default_loop (EV_A))
900 {
901 int signum;
902 gotsig = 0;
903
904 for (signum = signalmax; signum--; )
905 if (signals [signum].gotsig)
906 ev_feed_signal_event (EV_A_ signum + 1);
907 }
908
909 #if EV_ASYNC_ENABLE
910 if (gotasync)
911 {
912 int i;
913 gotasync = 0;
914
915 for (i = asynccnt; i--; )
916 if (asyncs [i]->sent)
917 {
918 asyncs [i]->sent = 0;
919 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
920 }
921 }
922 #endif
923 }
924
925 /*****************************************************************************/
926
927 static void
928 ev_sighandler (int signum)
929 {
930 #if EV_MULTIPLICITY
931 struct ev_loop *loop = &default_loop_struct;
932 #endif
933
934 #if _WIN32
935 signal (signum, ev_sighandler);
936 #endif
937
938 signals [signum - 1].gotsig = 1;
939 evpipe_write (EV_A_ &gotsig);
940 }
941
942 void noinline
943 ev_feed_signal_event (EV_P_ int signum)
944 {
945 WL w;
946
947 #if EV_MULTIPLICITY
948 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
949 #endif
950
951 --signum;
952
953 if (signum < 0 || signum >= signalmax)
954 return;
955
956 signals [signum].gotsig = 0;
957
958 for (w = signals [signum].head; w; w = w->next)
959 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
960 }
961
962 /*****************************************************************************/
963
964 static WL childs [EV_PID_HASHSIZE];
965
966 #ifndef _WIN32
967
968 static ev_signal childev;
969
970 #ifndef WIFCONTINUED
971 # define WIFCONTINUED(status) 0
972 #endif
973
974 void inline_speed
975 child_reap (EV_P_ int chain, int pid, int status)
976 {
977 ev_child *w;
978 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
979
980 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
981 {
982 if ((w->pid == pid || !w->pid)
983 && (!traced || (w->flags & 1)))
984 {
985 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
986 w->rpid = pid;
987 w->rstatus = status;
988 ev_feed_event (EV_A_ (W)w, EV_CHILD);
989 }
990 }
991 }
992
993 #ifndef WCONTINUED
994 # define WCONTINUED 0
995 #endif
996
997 static void
998 childcb (EV_P_ ev_signal *sw, int revents)
999 {
1000 int pid, status;
1001
1002 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1003 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1004 if (!WCONTINUED
1005 || errno != EINVAL
1006 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1007 return;
1008
1009 /* make sure we are called again until all children have been reaped */
1010 /* we need to do it this way so that the callback gets called before we continue */
1011 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1012
1013 child_reap (EV_A_ pid, pid, status);
1014 if (EV_PID_HASHSIZE > 1)
1015 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1016 }
1017
1018 #endif
1019
1020 /*****************************************************************************/
1021
1022 #if EV_USE_PORT
1023 # include "ev_port.c"
1024 #endif
1025 #if EV_USE_KQUEUE
1026 # include "ev_kqueue.c"
1027 #endif
1028 #if EV_USE_EPOLL
1029 # include "ev_epoll.c"
1030 #endif
1031 #if EV_USE_POLL
1032 # include "ev_poll.c"
1033 #endif
1034 #if EV_USE_SELECT
1035 # include "ev_select.c"
1036 #endif
1037
1038 int
1039 ev_version_major (void)
1040 {
1041 return EV_VERSION_MAJOR;
1042 }
1043
1044 int
1045 ev_version_minor (void)
1046 {
1047 return EV_VERSION_MINOR;
1048 }
1049
1050 /* return true if we are running with elevated privileges and should ignore env variables */
1051 int inline_size
1052 enable_secure (void)
1053 {
1054 #ifdef _WIN32
1055 return 0;
1056 #else
1057 return getuid () != geteuid ()
1058 || getgid () != getegid ();
1059 #endif
1060 }
1061
1062 unsigned int
1063 ev_supported_backends (void)
1064 {
1065 unsigned int flags = 0;
1066
1067 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1068 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1069 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1070 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1071 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1072
1073 return flags;
1074 }
1075
1076 unsigned int
1077 ev_recommended_backends (void)
1078 {
1079 unsigned int flags = ev_supported_backends ();
1080
1081 #ifndef __NetBSD__
1082 /* kqueue is borked on everything but netbsd apparently */
1083 /* it usually doesn't work correctly on anything but sockets and pipes */
1084 flags &= ~EVBACKEND_KQUEUE;
1085 #endif
1086 #ifdef __APPLE__
1087 // flags &= ~EVBACKEND_KQUEUE; for documentation
1088 flags &= ~EVBACKEND_POLL;
1089 #endif
1090
1091 return flags;
1092 }
1093
1094 unsigned int
1095 ev_embeddable_backends (void)
1096 {
1097 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1098
1099 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1100 /* please fix it and tell me how to detect the fix */
1101 flags &= ~EVBACKEND_EPOLL;
1102
1103 return flags;
1104 }
1105
1106 unsigned int
1107 ev_backend (EV_P)
1108 {
1109 return backend;
1110 }
1111
1112 unsigned int
1113 ev_loop_count (EV_P)
1114 {
1115 return loop_count;
1116 }
1117
1118 void
1119 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1120 {
1121 io_blocktime = interval;
1122 }
1123
1124 void
1125 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1126 {
1127 timeout_blocktime = interval;
1128 }
1129
1130 static void noinline
1131 loop_init (EV_P_ unsigned int flags)
1132 {
1133 if (!backend)
1134 {
1135 #if EV_USE_MONOTONIC
1136 {
1137 struct timespec ts;
1138 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1139 have_monotonic = 1;
1140 }
1141 #endif
1142
1143 ev_rt_now = ev_time ();
1144 mn_now = get_clock ();
1145 now_floor = mn_now;
1146 rtmn_diff = ev_rt_now - mn_now;
1147
1148 io_blocktime = 0.;
1149 timeout_blocktime = 0.;
1150 backend = 0;
1151 backend_fd = -1;
1152 gotasync = 0;
1153 #if EV_USE_INOTIFY
1154 fs_fd = -2;
1155 #endif
1156
1157 /* pid check not overridable via env */
1158 #ifndef _WIN32
1159 if (flags & EVFLAG_FORKCHECK)
1160 curpid = getpid ();
1161 #endif
1162
1163 if (!(flags & EVFLAG_NOENV)
1164 && !enable_secure ()
1165 && getenv ("LIBEV_FLAGS"))
1166 flags = atoi (getenv ("LIBEV_FLAGS"));
1167
1168 if (!(flags & 0x0000ffffUL))
1169 flags |= ev_recommended_backends ();
1170
1171 #if EV_USE_PORT
1172 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1173 #endif
1174 #if EV_USE_KQUEUE
1175 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1176 #endif
1177 #if EV_USE_EPOLL
1178 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1179 #endif
1180 #if EV_USE_POLL
1181 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1182 #endif
1183 #if EV_USE_SELECT
1184 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1185 #endif
1186
1187 ev_init (&pipeev, pipecb);
1188 ev_set_priority (&pipeev, EV_MAXPRI);
1189 }
1190 }
1191
1192 static void noinline
1193 loop_destroy (EV_P)
1194 {
1195 int i;
1196
1197 if (ev_is_active (&pipeev))
1198 {
1199 ev_ref (EV_A); /* signal watcher */
1200 ev_io_stop (EV_A_ &pipeev);
1201
1202 #if EV_USE_EVENTFD
1203 if (evfd >= 0)
1204 close (evfd);
1205 #endif
1206
1207 if (evpipe [0] >= 0)
1208 {
1209 close (evpipe [0]);
1210 close (evpipe [1]);
1211 }
1212 }
1213
1214 #if EV_USE_INOTIFY
1215 if (fs_fd >= 0)
1216 close (fs_fd);
1217 #endif
1218
1219 if (backend_fd >= 0)
1220 close (backend_fd);
1221
1222 #if EV_USE_PORT
1223 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1224 #endif
1225 #if EV_USE_KQUEUE
1226 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1227 #endif
1228 #if EV_USE_EPOLL
1229 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1230 #endif
1231 #if EV_USE_POLL
1232 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1233 #endif
1234 #if EV_USE_SELECT
1235 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1236 #endif
1237
1238 for (i = NUMPRI; i--; )
1239 {
1240 array_free (pending, [i]);
1241 #if EV_IDLE_ENABLE
1242 array_free (idle, [i]);
1243 #endif
1244 }
1245
1246 ev_free (anfds); anfdmax = 0;
1247
1248 /* have to use the microsoft-never-gets-it-right macro */
1249 array_free (fdchange, EMPTY);
1250 array_free (timer, EMPTY);
1251 #if EV_PERIODIC_ENABLE
1252 array_free (periodic, EMPTY);
1253 #endif
1254 #if EV_FORK_ENABLE
1255 array_free (fork, EMPTY);
1256 #endif
1257 array_free (prepare, EMPTY);
1258 array_free (check, EMPTY);
1259 #if EV_ASYNC_ENABLE
1260 array_free (async, EMPTY);
1261 #endif
1262
1263 backend = 0;
1264 }
1265
1266 void inline_size infy_fork (EV_P);
1267
1268 void inline_size
1269 loop_fork (EV_P)
1270 {
1271 #if EV_USE_PORT
1272 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1273 #endif
1274 #if EV_USE_KQUEUE
1275 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1276 #endif
1277 #if EV_USE_EPOLL
1278 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1279 #endif
1280 #if EV_USE_INOTIFY
1281 infy_fork (EV_A);
1282 #endif
1283
1284 if (ev_is_active (&pipeev))
1285 {
1286 /* this "locks" the handlers against writing to the pipe */
1287 /* while we modify the fd vars */
1288 gotsig = 1;
1289 #if EV_ASYNC_ENABLE
1290 gotasync = 1;
1291 #endif
1292
1293 ev_ref (EV_A);
1294 ev_io_stop (EV_A_ &pipeev);
1295
1296 #if EV_USE_EVENTFD
1297 if (evfd >= 0)
1298 close (evfd);
1299 #endif
1300
1301 if (evpipe [0] >= 0)
1302 {
1303 close (evpipe [0]);
1304 close (evpipe [1]);
1305 }
1306
1307 evpipe_init (EV_A);
1308 /* now iterate over everything, in case we missed something */
1309 pipecb (EV_A_ &pipeev, EV_READ);
1310 }
1311
1312 postfork = 0;
1313 }
1314
1315 #if EV_MULTIPLICITY
1316 struct ev_loop *
1317 ev_loop_new (unsigned int flags)
1318 {
1319 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1320
1321 memset (loop, 0, sizeof (struct ev_loop));
1322
1323 loop_init (EV_A_ flags);
1324
1325 if (ev_backend (EV_A))
1326 return loop;
1327
1328 return 0;
1329 }
1330
1331 void
1332 ev_loop_destroy (EV_P)
1333 {
1334 loop_destroy (EV_A);
1335 ev_free (loop);
1336 }
1337
1338 void
1339 ev_loop_fork (EV_P)
1340 {
1341 postfork = 1; /* must be in line with ev_default_fork */
1342 }
1343
1344 #endif
1345
1346 #if EV_MULTIPLICITY
1347 struct ev_loop *
1348 ev_default_loop_init (unsigned int flags)
1349 #else
1350 int
1351 ev_default_loop (unsigned int flags)
1352 #endif
1353 {
1354 if (!ev_default_loop_ptr)
1355 {
1356 #if EV_MULTIPLICITY
1357 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1358 #else
1359 ev_default_loop_ptr = 1;
1360 #endif
1361
1362 loop_init (EV_A_ flags);
1363
1364 if (ev_backend (EV_A))
1365 {
1366 #ifndef _WIN32
1367 ev_signal_init (&childev, childcb, SIGCHLD);
1368 ev_set_priority (&childev, EV_MAXPRI);
1369 ev_signal_start (EV_A_ &childev);
1370 ev_unref (EV_A); /* child watcher should not keep loop alive */
1371 #endif
1372 }
1373 else
1374 ev_default_loop_ptr = 0;
1375 }
1376
1377 return ev_default_loop_ptr;
1378 }
1379
1380 void
1381 ev_default_destroy (void)
1382 {
1383 #if EV_MULTIPLICITY
1384 struct ev_loop *loop = ev_default_loop_ptr;
1385 #endif
1386
1387 #ifndef _WIN32
1388 ev_ref (EV_A); /* child watcher */
1389 ev_signal_stop (EV_A_ &childev);
1390 #endif
1391
1392 loop_destroy (EV_A);
1393 }
1394
1395 void
1396 ev_default_fork (void)
1397 {
1398 #if EV_MULTIPLICITY
1399 struct ev_loop *loop = ev_default_loop_ptr;
1400 #endif
1401
1402 if (backend)
1403 postfork = 1; /* must be in line with ev_loop_fork */
1404 }
1405
1406 /*****************************************************************************/
1407
1408 void
1409 ev_invoke (EV_P_ void *w, int revents)
1410 {
1411 EV_CB_INVOKE ((W)w, revents);
1412 }
1413
1414 void inline_speed
1415 call_pending (EV_P)
1416 {
1417 int pri;
1418
1419 for (pri = NUMPRI; pri--; )
1420 while (pendingcnt [pri])
1421 {
1422 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1423
1424 if (expect_true (p->w))
1425 {
1426 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1427
1428 p->w->pending = 0;
1429 EV_CB_INVOKE (p->w, p->events);
1430 }
1431 }
1432 }
1433
1434 void inline_size
1435 timers_reify (EV_P)
1436 {
1437 while (timercnt && ((WT)timers [0])->at <= mn_now)
1438 {
1439 ev_timer *w = (ev_timer *)timers [0];
1440
1441 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1442
1443 /* first reschedule or stop timer */
1444 if (w->repeat)
1445 {
1446 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1447
1448 ((WT)w)->at += w->repeat;
1449 if (((WT)w)->at < mn_now)
1450 ((WT)w)->at = mn_now;
1451
1452 downheap (timers, timercnt, 0);
1453 }
1454 else
1455 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1456
1457 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1458 }
1459 }
1460
1461 #if EV_PERIODIC_ENABLE
1462 void inline_size
1463 periodics_reify (EV_P)
1464 {
1465 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1466 {
1467 ev_periodic *w = (ev_periodic *)periodics [0];
1468
1469 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1470
1471 /* first reschedule or stop timer */
1472 if (w->reschedule_cb)
1473 {
1474 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1475 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1476 downheap (periodics, periodiccnt, 0);
1477 }
1478 else if (w->interval)
1479 {
1480 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1481 if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
1482 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1483 downheap (periodics, periodiccnt, 0);
1484 }
1485 else
1486 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1487
1488 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1489 }
1490 }
1491
1492 static void noinline
1493 periodics_reschedule (EV_P)
1494 {
1495 int i;
1496
1497 /* adjust periodics after time jump */
1498 for (i = 0; i < periodiccnt; ++i)
1499 {
1500 ev_periodic *w = (ev_periodic *)periodics [i];
1501
1502 if (w->reschedule_cb)
1503 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1504 else if (w->interval)
1505 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1506 }
1507
1508 /* now rebuild the heap */
1509 for (i = periodiccnt >> 1; i--; )
1510 downheap (periodics, periodiccnt, i);
1511 }
1512 #endif
1513
1514 #if EV_IDLE_ENABLE
1515 void inline_size
1516 idle_reify (EV_P)
1517 {
1518 if (expect_false (idleall))
1519 {
1520 int pri;
1521
1522 for (pri = NUMPRI; pri--; )
1523 {
1524 if (pendingcnt [pri])
1525 break;
1526
1527 if (idlecnt [pri])
1528 {
1529 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1530 break;
1531 }
1532 }
1533 }
1534 }
1535 #endif
1536
1537 void inline_speed
1538 time_update (EV_P_ ev_tstamp max_block)
1539 {
1540 int i;
1541
1542 #if EV_USE_MONOTONIC
1543 if (expect_true (have_monotonic))
1544 {
1545 ev_tstamp odiff = rtmn_diff;
1546
1547 mn_now = get_clock ();
1548
1549 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1550 /* interpolate in the meantime */
1551 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1552 {
1553 ev_rt_now = rtmn_diff + mn_now;
1554 return;
1555 }
1556
1557 now_floor = mn_now;
1558 ev_rt_now = ev_time ();
1559
1560 /* loop a few times, before making important decisions.
1561 * on the choice of "4": one iteration isn't enough,
1562 * in case we get preempted during the calls to
1563 * ev_time and get_clock. a second call is almost guaranteed
1564 * to succeed in that case, though. and looping a few more times
1565 * doesn't hurt either as we only do this on time-jumps or
1566 * in the unlikely event of having been preempted here.
1567 */
1568 for (i = 4; --i; )
1569 {
1570 rtmn_diff = ev_rt_now - mn_now;
1571
1572 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1573 return; /* all is well */
1574
1575 ev_rt_now = ev_time ();
1576 mn_now = get_clock ();
1577 now_floor = mn_now;
1578 }
1579
1580 # if EV_PERIODIC_ENABLE
1581 periodics_reschedule (EV_A);
1582 # endif
1583 /* no timer adjustment, as the monotonic clock doesn't jump */
1584 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1585 }
1586 else
1587 #endif
1588 {
1589 ev_rt_now = ev_time ();
1590
1591 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1592 {
1593 #if EV_PERIODIC_ENABLE
1594 periodics_reschedule (EV_A);
1595 #endif
1596 /* adjust timers. this is easy, as the offset is the same for all of them */
1597 for (i = 0; i < timercnt; ++i)
1598 ((WT)timers [i])->at += ev_rt_now - mn_now;
1599 }
1600
1601 mn_now = ev_rt_now;
1602 }
1603 }
1604
1605 void
1606 ev_ref (EV_P)
1607 {
1608 ++activecnt;
1609 }
1610
1611 void
1612 ev_unref (EV_P)
1613 {
1614 --activecnt;
1615 }
1616
1617 static int loop_done;
1618
1619 void
1620 ev_loop (EV_P_ int flags)
1621 {
1622 loop_done = EVUNLOOP_CANCEL;
1623
1624 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1625
1626 do
1627 {
1628 #ifndef _WIN32
1629 if (expect_false (curpid)) /* penalise the forking check even more */
1630 if (expect_false (getpid () != curpid))
1631 {
1632 curpid = getpid ();
1633 postfork = 1;
1634 }
1635 #endif
1636
1637 #if EV_FORK_ENABLE
1638 /* we might have forked, so queue fork handlers */
1639 if (expect_false (postfork))
1640 if (forkcnt)
1641 {
1642 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1643 call_pending (EV_A);
1644 }
1645 #endif
1646
1647 /* queue prepare watchers (and execute them) */
1648 if (expect_false (preparecnt))
1649 {
1650 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1651 call_pending (EV_A);
1652 }
1653
1654 if (expect_false (!activecnt))
1655 break;
1656
1657 /* we might have forked, so reify kernel state if necessary */
1658 if (expect_false (postfork))
1659 loop_fork (EV_A);
1660
1661 /* update fd-related kernel structures */
1662 fd_reify (EV_A);
1663
1664 /* calculate blocking time */
1665 {
1666 ev_tstamp waittime = 0.;
1667 ev_tstamp sleeptime = 0.;
1668
1669 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1670 {
1671 /* update time to cancel out callback processing overhead */
1672 time_update (EV_A_ 1e100);
1673
1674 waittime = MAX_BLOCKTIME;
1675
1676 if (timercnt)
1677 {
1678 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1679 if (waittime > to) waittime = to;
1680 }
1681
1682 #if EV_PERIODIC_ENABLE
1683 if (periodiccnt)
1684 {
1685 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1686 if (waittime > to) waittime = to;
1687 }
1688 #endif
1689
1690 if (expect_false (waittime < timeout_blocktime))
1691 waittime = timeout_blocktime;
1692
1693 sleeptime = waittime - backend_fudge;
1694
1695 if (expect_true (sleeptime > io_blocktime))
1696 sleeptime = io_blocktime;
1697
1698 if (sleeptime)
1699 {
1700 ev_sleep (sleeptime);
1701 waittime -= sleeptime;
1702 }
1703 }
1704
1705 ++loop_count;
1706 backend_poll (EV_A_ waittime);
1707
1708 /* update ev_rt_now, do magic */
1709 time_update (EV_A_ waittime + sleeptime);
1710 }
1711
1712 /* queue pending timers and reschedule them */
1713 timers_reify (EV_A); /* relative timers called last */
1714 #if EV_PERIODIC_ENABLE
1715 periodics_reify (EV_A); /* absolute timers called first */
1716 #endif
1717
1718 #if EV_IDLE_ENABLE
1719 /* queue idle watchers unless other events are pending */
1720 idle_reify (EV_A);
1721 #endif
1722
1723 /* queue check watchers, to be executed first */
1724 if (expect_false (checkcnt))
1725 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1726
1727 call_pending (EV_A);
1728 }
1729 while (expect_true (
1730 activecnt
1731 && !loop_done
1732 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
1733 ));
1734
1735 if (loop_done == EVUNLOOP_ONE)
1736 loop_done = EVUNLOOP_CANCEL;
1737 }
1738
1739 void
1740 ev_unloop (EV_P_ int how)
1741 {
1742 loop_done = how;
1743 }
1744
1745 /*****************************************************************************/
1746
1747 void inline_size
1748 wlist_add (WL *head, WL elem)
1749 {
1750 elem->next = *head;
1751 *head = elem;
1752 }
1753
1754 void inline_size
1755 wlist_del (WL *head, WL elem)
1756 {
1757 while (*head)
1758 {
1759 if (*head == elem)
1760 {
1761 *head = elem->next;
1762 return;
1763 }
1764
1765 head = &(*head)->next;
1766 }
1767 }
1768
1769 void inline_speed
1770 clear_pending (EV_P_ W w)
1771 {
1772 if (w->pending)
1773 {
1774 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1775 w->pending = 0;
1776 }
1777 }
1778
1779 int
1780 ev_clear_pending (EV_P_ void *w)
1781 {
1782 W w_ = (W)w;
1783 int pending = w_->pending;
1784
1785 if (expect_true (pending))
1786 {
1787 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1788 w_->pending = 0;
1789 p->w = 0;
1790 return p->events;
1791 }
1792 else
1793 return 0;
1794 }
1795
1796 void inline_size
1797 pri_adjust (EV_P_ W w)
1798 {
1799 int pri = w->priority;
1800 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1801 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1802 w->priority = pri;
1803 }
1804
1805 void inline_speed
1806 ev_start (EV_P_ W w, int active)
1807 {
1808 pri_adjust (EV_A_ w);
1809 w->active = active;
1810 ev_ref (EV_A);
1811 }
1812
1813 void inline_size
1814 ev_stop (EV_P_ W w)
1815 {
1816 ev_unref (EV_A);
1817 w->active = 0;
1818 }
1819
1820 /*****************************************************************************/
1821
1822 void noinline
1823 ev_io_start (EV_P_ ev_io *w)
1824 {
1825 int fd = w->fd;
1826
1827 if (expect_false (ev_is_active (w)))
1828 return;
1829
1830 assert (("ev_io_start called with negative fd", fd >= 0));
1831
1832 ev_start (EV_A_ (W)w, 1);
1833 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1834 wlist_add (&anfds[fd].head, (WL)w);
1835
1836 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1837 w->events &= ~EV_IOFDSET;
1838 }
1839
1840 void noinline
1841 ev_io_stop (EV_P_ ev_io *w)
1842 {
1843 clear_pending (EV_A_ (W)w);
1844 if (expect_false (!ev_is_active (w)))
1845 return;
1846
1847 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1848
1849 wlist_del (&anfds[w->fd].head, (WL)w);
1850 ev_stop (EV_A_ (W)w);
1851
1852 fd_change (EV_A_ w->fd, 1);
1853 }
1854
1855 void noinline
1856 ev_timer_start (EV_P_ ev_timer *w)
1857 {
1858 if (expect_false (ev_is_active (w)))
1859 return;
1860
1861 ((WT)w)->at += mn_now;
1862
1863 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1864
1865 ev_start (EV_A_ (W)w, ++timercnt);
1866 array_needsize (WT, timers, timermax, timercnt, EMPTY2);
1867 timers [timercnt - 1] = (WT)w;
1868 upheap (timers, timercnt - 1);
1869
1870 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1871 }
1872
1873 void noinline
1874 ev_timer_stop (EV_P_ ev_timer *w)
1875 {
1876 clear_pending (EV_A_ (W)w);
1877 if (expect_false (!ev_is_active (w)))
1878 return;
1879
1880 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
1881
1882 {
1883 int active = ((W)w)->active;
1884
1885 if (expect_true (--active < --timercnt))
1886 {
1887 timers [active] = timers [timercnt];
1888 adjustheap (timers, timercnt, active);
1889 }
1890 }
1891
1892 ((WT)w)->at -= mn_now;
1893
1894 ev_stop (EV_A_ (W)w);
1895 }
1896
1897 void noinline
1898 ev_timer_again (EV_P_ ev_timer *w)
1899 {
1900 if (ev_is_active (w))
1901 {
1902 if (w->repeat)
1903 {
1904 ((WT)w)->at = mn_now + w->repeat;
1905 adjustheap (timers, timercnt, ((W)w)->active - 1);
1906 }
1907 else
1908 ev_timer_stop (EV_A_ w);
1909 }
1910 else if (w->repeat)
1911 {
1912 w->at = w->repeat;
1913 ev_timer_start (EV_A_ w);
1914 }
1915 }
1916
1917 #if EV_PERIODIC_ENABLE
1918 void noinline
1919 ev_periodic_start (EV_P_ ev_periodic *w)
1920 {
1921 if (expect_false (ev_is_active (w)))
1922 return;
1923
1924 if (w->reschedule_cb)
1925 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1926 else if (w->interval)
1927 {
1928 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1929 /* this formula differs from the one in periodic_reify because we do not always round up */
1930 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1931 }
1932 else
1933 ((WT)w)->at = w->offset;
1934
1935 ev_start (EV_A_ (W)w, ++periodiccnt);
1936 array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
1937 periodics [periodiccnt - 1] = (WT)w;
1938 upheap (periodics, periodiccnt - 1);
1939
1940 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1941 }
1942
1943 void noinline
1944 ev_periodic_stop (EV_P_ ev_periodic *w)
1945 {
1946 clear_pending (EV_A_ (W)w);
1947 if (expect_false (!ev_is_active (w)))
1948 return;
1949
1950 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
1951
1952 {
1953 int active = ((W)w)->active;
1954
1955 if (expect_true (--active < --periodiccnt))
1956 {
1957 periodics [active] = periodics [periodiccnt];
1958 adjustheap (periodics, periodiccnt, active);
1959 }
1960 }
1961
1962 ev_stop (EV_A_ (W)w);
1963 }
1964
1965 void noinline
1966 ev_periodic_again (EV_P_ ev_periodic *w)
1967 {
1968 /* TODO: use adjustheap and recalculation */
1969 ev_periodic_stop (EV_A_ w);
1970 ev_periodic_start (EV_A_ w);
1971 }
1972 #endif
1973
1974 #ifndef SA_RESTART
1975 # define SA_RESTART 0
1976 #endif
1977
1978 void noinline
1979 ev_signal_start (EV_P_ ev_signal *w)
1980 {
1981 #if EV_MULTIPLICITY
1982 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1983 #endif
1984 if (expect_false (ev_is_active (w)))
1985 return;
1986
1987 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1988
1989 evpipe_init (EV_A);
1990
1991 {
1992 #ifndef _WIN32
1993 sigset_t full, prev;
1994 sigfillset (&full);
1995 sigprocmask (SIG_SETMASK, &full, &prev);
1996 #endif
1997
1998 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1999
2000 #ifndef _WIN32
2001 sigprocmask (SIG_SETMASK, &prev, 0);
2002 #endif
2003 }
2004
2005 ev_start (EV_A_ (W)w, 1);
2006 wlist_add (&signals [w->signum - 1].head, (WL)w);
2007
2008 if (!((WL)w)->next)
2009 {
2010 #if _WIN32
2011 signal (w->signum, ev_sighandler);
2012 #else
2013 struct sigaction sa;
2014 sa.sa_handler = ev_sighandler;
2015 sigfillset (&sa.sa_mask);
2016 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2017 sigaction (w->signum, &sa, 0);
2018 #endif
2019 }
2020 }
2021
2022 void noinline
2023 ev_signal_stop (EV_P_ ev_signal *w)
2024 {
2025 clear_pending (EV_A_ (W)w);
2026 if (expect_false (!ev_is_active (w)))
2027 return;
2028
2029 wlist_del (&signals [w->signum - 1].head, (WL)w);
2030 ev_stop (EV_A_ (W)w);
2031
2032 if (!signals [w->signum - 1].head)
2033 signal (w->signum, SIG_DFL);
2034 }
2035
2036 void
2037 ev_child_start (EV_P_ ev_child *w)
2038 {
2039 #if EV_MULTIPLICITY
2040 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2041 #endif
2042 if (expect_false (ev_is_active (w)))
2043 return;
2044
2045 ev_start (EV_A_ (W)w, 1);
2046 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2047 }
2048
2049 void
2050 ev_child_stop (EV_P_ ev_child *w)
2051 {
2052 clear_pending (EV_A_ (W)w);
2053 if (expect_false (!ev_is_active (w)))
2054 return;
2055
2056 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2057 ev_stop (EV_A_ (W)w);
2058 }
2059
2060 #if EV_STAT_ENABLE
2061
2062 # ifdef _WIN32
2063 # undef lstat
2064 # define lstat(a,b) _stati64 (a,b)
2065 # endif
2066
2067 #define DEF_STAT_INTERVAL 5.0074891
2068 #define MIN_STAT_INTERVAL 0.1074891
2069
2070 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2071
2072 #if EV_USE_INOTIFY
2073 # define EV_INOTIFY_BUFSIZE 8192
2074
2075 static void noinline
2076 infy_add (EV_P_ ev_stat *w)
2077 {
2078 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);
2079
2080 if (w->wd < 0)
2081 {
2082 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2083
2084 /* monitor some parent directory for speedup hints */
2085 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2086 {
2087 char path [4096];
2088 strcpy (path, w->path);
2089
2090 do
2091 {
2092 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2093 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2094
2095 char *pend = strrchr (path, '/');
2096
2097 if (!pend)
2098 break; /* whoops, no '/', complain to your admin */
2099
2100 *pend = 0;
2101 w->wd = inotify_add_watch (fs_fd, path, mask);
2102 }
2103 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2104 }
2105 }
2106 else
2107 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2108
2109 if (w->wd >= 0)
2110 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2111 }
2112
2113 static void noinline
2114 infy_del (EV_P_ ev_stat *w)
2115 {
2116 int slot;
2117 int wd = w->wd;
2118
2119 if (wd < 0)
2120 return;
2121
2122 w->wd = -2;
2123 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2124 wlist_del (&fs_hash [slot].head, (WL)w);
2125
2126 /* remove this watcher, if others are watching it, they will rearm */
2127 inotify_rm_watch (fs_fd, wd);
2128 }
2129
2130 static void noinline
2131 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2132 {
2133 if (slot < 0)
2134 /* overflow, need to check for all hahs slots */
2135 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2136 infy_wd (EV_A_ slot, wd, ev);
2137 else
2138 {
2139 WL w_;
2140
2141 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2142 {
2143 ev_stat *w = (ev_stat *)w_;
2144 w_ = w_->next; /* lets us remove this watcher and all before it */
2145
2146 if (w->wd == wd || wd == -1)
2147 {
2148 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2149 {
2150 w->wd = -1;
2151 infy_add (EV_A_ w); /* re-add, no matter what */
2152 }
2153
2154 stat_timer_cb (EV_A_ &w->timer, 0);
2155 }
2156 }
2157 }
2158 }
2159
2160 static void
2161 infy_cb (EV_P_ ev_io *w, int revents)
2162 {
2163 char buf [EV_INOTIFY_BUFSIZE];
2164 struct inotify_event *ev = (struct inotify_event *)buf;
2165 int ofs;
2166 int len = read (fs_fd, buf, sizeof (buf));
2167
2168 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2169 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2170 }
2171
2172 void inline_size
2173 infy_init (EV_P)
2174 {
2175 if (fs_fd != -2)
2176 return;
2177
2178 fs_fd = inotify_init ();
2179
2180 if (fs_fd >= 0)
2181 {
2182 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2183 ev_set_priority (&fs_w, EV_MAXPRI);
2184 ev_io_start (EV_A_ &fs_w);
2185 }
2186 }
2187
2188 void inline_size
2189 infy_fork (EV_P)
2190 {
2191 int slot;
2192
2193 if (fs_fd < 0)
2194 return;
2195
2196 close (fs_fd);
2197 fs_fd = inotify_init ();
2198
2199 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2200 {
2201 WL w_ = fs_hash [slot].head;
2202 fs_hash [slot].head = 0;
2203
2204 while (w_)
2205 {
2206 ev_stat *w = (ev_stat *)w_;
2207 w_ = w_->next; /* lets us add this watcher */
2208
2209 w->wd = -1;
2210
2211 if (fs_fd >= 0)
2212 infy_add (EV_A_ w); /* re-add, no matter what */
2213 else
2214 ev_timer_start (EV_A_ &w->timer);
2215 }
2216
2217 }
2218 }
2219
2220 #endif
2221
2222 void
2223 ev_stat_stat (EV_P_ ev_stat *w)
2224 {
2225 if (lstat (w->path, &w->attr) < 0)
2226 w->attr.st_nlink = 0;
2227 else if (!w->attr.st_nlink)
2228 w->attr.st_nlink = 1;
2229 }
2230
2231 static void noinline
2232 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2233 {
2234 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2235
2236 /* we copy this here each the time so that */
2237 /* prev has the old value when the callback gets invoked */
2238 w->prev = w->attr;
2239 ev_stat_stat (EV_A_ w);
2240
2241 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2242 if (
2243 w->prev.st_dev != w->attr.st_dev
2244 || w->prev.st_ino != w->attr.st_ino
2245 || w->prev.st_mode != w->attr.st_mode
2246 || w->prev.st_nlink != w->attr.st_nlink
2247 || w->prev.st_uid != w->attr.st_uid
2248 || w->prev.st_gid != w->attr.st_gid
2249 || w->prev.st_rdev != w->attr.st_rdev
2250 || w->prev.st_size != w->attr.st_size
2251 || w->prev.st_atime != w->attr.st_atime
2252 || w->prev.st_mtime != w->attr.st_mtime
2253 || w->prev.st_ctime != w->attr.st_ctime
2254 ) {
2255 #if EV_USE_INOTIFY
2256 infy_del (EV_A_ w);
2257 infy_add (EV_A_ w);
2258 ev_stat_stat (EV_A_ w); /* avoid race... */
2259 #endif
2260
2261 ev_feed_event (EV_A_ w, EV_STAT);
2262 }
2263 }
2264
2265 void
2266 ev_stat_start (EV_P_ ev_stat *w)
2267 {
2268 if (expect_false (ev_is_active (w)))
2269 return;
2270
2271 /* since we use memcmp, we need to clear any padding data etc. */
2272 memset (&w->prev, 0, sizeof (ev_statdata));
2273 memset (&w->attr, 0, sizeof (ev_statdata));
2274
2275 ev_stat_stat (EV_A_ w);
2276
2277 if (w->interval < MIN_STAT_INTERVAL)
2278 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2279
2280 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2281 ev_set_priority (&w->timer, ev_priority (w));
2282
2283 #if EV_USE_INOTIFY
2284 infy_init (EV_A);
2285
2286 if (fs_fd >= 0)
2287 infy_add (EV_A_ w);
2288 else
2289 #endif
2290 ev_timer_start (EV_A_ &w->timer);
2291
2292 ev_start (EV_A_ (W)w, 1);
2293 }
2294
2295 void
2296 ev_stat_stop (EV_P_ ev_stat *w)
2297 {
2298 clear_pending (EV_A_ (W)w);
2299 if (expect_false (!ev_is_active (w)))
2300 return;
2301
2302 #if EV_USE_INOTIFY
2303 infy_del (EV_A_ w);
2304 #endif
2305 ev_timer_stop (EV_A_ &w->timer);
2306
2307 ev_stop (EV_A_ (W)w);
2308 }
2309 #endif
2310
2311 #if EV_IDLE_ENABLE
2312 void
2313 ev_idle_start (EV_P_ ev_idle *w)
2314 {
2315 if (expect_false (ev_is_active (w)))
2316 return;
2317
2318 pri_adjust (EV_A_ (W)w);
2319
2320 {
2321 int active = ++idlecnt [ABSPRI (w)];
2322
2323 ++idleall;
2324 ev_start (EV_A_ (W)w, active);
2325
2326 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2327 idles [ABSPRI (w)][active - 1] = w;
2328 }
2329 }
2330
2331 void
2332 ev_idle_stop (EV_P_ ev_idle *w)
2333 {
2334 clear_pending (EV_A_ (W)w);
2335 if (expect_false (!ev_is_active (w)))
2336 return;
2337
2338 {
2339 int active = ((W)w)->active;
2340
2341 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2342 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2343
2344 ev_stop (EV_A_ (W)w);
2345 --idleall;
2346 }
2347 }
2348 #endif
2349
2350 void
2351 ev_prepare_start (EV_P_ ev_prepare *w)
2352 {
2353 if (expect_false (ev_is_active (w)))
2354 return;
2355
2356 ev_start (EV_A_ (W)w, ++preparecnt);
2357 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2358 prepares [preparecnt - 1] = w;
2359 }
2360
2361 void
2362 ev_prepare_stop (EV_P_ ev_prepare *w)
2363 {
2364 clear_pending (EV_A_ (W)w);
2365 if (expect_false (!ev_is_active (w)))
2366 return;
2367
2368 {
2369 int active = ((W)w)->active;
2370 prepares [active - 1] = prepares [--preparecnt];
2371 ((W)prepares [active - 1])->active = active;
2372 }
2373
2374 ev_stop (EV_A_ (W)w);
2375 }
2376
2377 void
2378 ev_check_start (EV_P_ ev_check *w)
2379 {
2380 if (expect_false (ev_is_active (w)))
2381 return;
2382
2383 ev_start (EV_A_ (W)w, ++checkcnt);
2384 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2385 checks [checkcnt - 1] = w;
2386 }
2387
2388 void
2389 ev_check_stop (EV_P_ ev_check *w)
2390 {
2391 clear_pending (EV_A_ (W)w);
2392 if (expect_false (!ev_is_active (w)))
2393 return;
2394
2395 {
2396 int active = ((W)w)->active;
2397 checks [active - 1] = checks [--checkcnt];
2398 ((W)checks [active - 1])->active = active;
2399 }
2400
2401 ev_stop (EV_A_ (W)w);
2402 }
2403
2404 #if EV_EMBED_ENABLE
2405 void noinline
2406 ev_embed_sweep (EV_P_ ev_embed *w)
2407 {
2408 ev_loop (w->other, EVLOOP_NONBLOCK);
2409 }
2410
2411 static void
2412 embed_io_cb (EV_P_ ev_io *io, int revents)
2413 {
2414 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2415
2416 if (ev_cb (w))
2417 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2418 else
2419 ev_loop (w->other, EVLOOP_NONBLOCK);
2420 }
2421
2422 static void
2423 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2424 {
2425 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2426
2427 {
2428 struct ev_loop *loop = w->other;
2429
2430 while (fdchangecnt)
2431 {
2432 fd_reify (EV_A);
2433 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2434 }
2435 }
2436 }
2437
2438 #if 0
2439 static void
2440 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2441 {
2442 ev_idle_stop (EV_A_ idle);
2443 }
2444 #endif
2445
2446 void
2447 ev_embed_start (EV_P_ ev_embed *w)
2448 {
2449 if (expect_false (ev_is_active (w)))
2450 return;
2451
2452 {
2453 struct ev_loop *loop = w->other;
2454 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2455 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2456 }
2457
2458 ev_set_priority (&w->io, ev_priority (w));
2459 ev_io_start (EV_A_ &w->io);
2460
2461 ev_prepare_init (&w->prepare, embed_prepare_cb);
2462 ev_set_priority (&w->prepare, EV_MINPRI);
2463 ev_prepare_start (EV_A_ &w->prepare);
2464
2465 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2466
2467 ev_start (EV_A_ (W)w, 1);
2468 }
2469
2470 void
2471 ev_embed_stop (EV_P_ ev_embed *w)
2472 {
2473 clear_pending (EV_A_ (W)w);
2474 if (expect_false (!ev_is_active (w)))
2475 return;
2476
2477 ev_io_stop (EV_A_ &w->io);
2478 ev_prepare_stop (EV_A_ &w->prepare);
2479
2480 ev_stop (EV_A_ (W)w);
2481 }
2482 #endif
2483
2484 #if EV_FORK_ENABLE
2485 void
2486 ev_fork_start (EV_P_ ev_fork *w)
2487 {
2488 if (expect_false (ev_is_active (w)))
2489 return;
2490
2491 ev_start (EV_A_ (W)w, ++forkcnt);
2492 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2493 forks [forkcnt - 1] = w;
2494 }
2495
2496 void
2497 ev_fork_stop (EV_P_ ev_fork *w)
2498 {
2499 clear_pending (EV_A_ (W)w);
2500 if (expect_false (!ev_is_active (w)))
2501 return;
2502
2503 {
2504 int active = ((W)w)->active;
2505 forks [active - 1] = forks [--forkcnt];
2506 ((W)forks [active - 1])->active = active;
2507 }
2508
2509 ev_stop (EV_A_ (W)w);
2510 }
2511 #endif
2512
2513 #if EV_ASYNC_ENABLE
2514 void
2515 ev_async_start (EV_P_ ev_async *w)
2516 {
2517 if (expect_false (ev_is_active (w)))
2518 return;
2519
2520 evpipe_init (EV_A);
2521
2522 ev_start (EV_A_ (W)w, ++asynccnt);
2523 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2524 asyncs [asynccnt - 1] = w;
2525 }
2526
2527 void
2528 ev_async_stop (EV_P_ ev_async *w)
2529 {
2530 clear_pending (EV_A_ (W)w);
2531 if (expect_false (!ev_is_active (w)))
2532 return;
2533
2534 {
2535 int active = ((W)w)->active;
2536 asyncs [active - 1] = asyncs [--asynccnt];
2537 ((W)asyncs [active - 1])->active = active;
2538 }
2539
2540 ev_stop (EV_A_ (W)w);
2541 }
2542
2543 void
2544 ev_async_send (EV_P_ ev_async *w)
2545 {
2546 w->sent = 1;
2547 evpipe_write (EV_A_ &gotasync);
2548 }
2549 #endif
2550
2551 /*****************************************************************************/
2552
2553 struct ev_once
2554 {
2555 ev_io io;
2556 ev_timer to;
2557 void (*cb)(int revents, void *arg);
2558 void *arg;
2559 };
2560
2561 static void
2562 once_cb (EV_P_ struct ev_once *once, int revents)
2563 {
2564 void (*cb)(int revents, void *arg) = once->cb;
2565 void *arg = once->arg;
2566
2567 ev_io_stop (EV_A_ &once->io);
2568 ev_timer_stop (EV_A_ &once->to);
2569 ev_free (once);
2570
2571 cb (revents, arg);
2572 }
2573
2574 static void
2575 once_cb_io (EV_P_ ev_io *w, int revents)
2576 {
2577 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2578 }
2579
2580 static void
2581 once_cb_to (EV_P_ ev_timer *w, int revents)
2582 {
2583 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2584 }
2585
2586 void
2587 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2588 {
2589 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2590
2591 if (expect_false (!once))
2592 {
2593 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2594 return;
2595 }
2596
2597 once->cb = cb;
2598 once->arg = arg;
2599
2600 ev_init (&once->io, once_cb_io);
2601 if (fd >= 0)
2602 {
2603 ev_io_set (&once->io, fd, events);
2604 ev_io_start (EV_A_ &once->io);
2605 }
2606
2607 ev_init (&once->to, once_cb_to);
2608 if (timeout >= 0.)
2609 {
2610 ev_timer_set (&once->to, timeout, 0.);
2611 ev_timer_start (EV_A_ &once->to);
2612 }
2613 }
2614
2615 #if EV_MULTIPLICITY
2616 #include "ev_wrap.h"
2617 #endif
2618
2619 #ifdef __cplusplus
2620 }
2621 #endif
2622