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Revision: 1.227
Committed: Fri May 2 07:20:01 2008 UTC (16 years, 2 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.226: +2 -0 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 /* this big block deduces configuration from config.h */
45 #ifndef EV_STANDALONE
46 # ifdef EV_CONFIG_H
47 # include EV_CONFIG_H
48 # else
49 # include "config.h"
50 # endif
51
52 # if HAVE_CLOCK_GETTIME
53 # ifndef EV_USE_MONOTONIC
54 # define EV_USE_MONOTONIC 1
55 # endif
56 # ifndef EV_USE_REALTIME
57 # define EV_USE_REALTIME 1
58 # endif
59 # else
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 0
62 # endif
63 # ifndef EV_USE_REALTIME
64 # define EV_USE_REALTIME 0
65 # endif
66 # endif
67
68 # ifndef EV_USE_NANOSLEEP
69 # if HAVE_NANOSLEEP
70 # define EV_USE_NANOSLEEP 1
71 # else
72 # define EV_USE_NANOSLEEP 0
73 # endif
74 # endif
75
76 # ifndef EV_USE_SELECT
77 # if HAVE_SELECT && HAVE_SYS_SELECT_H
78 # define EV_USE_SELECT 1
79 # else
80 # define EV_USE_SELECT 0
81 # endif
82 # endif
83
84 # ifndef EV_USE_POLL
85 # if HAVE_POLL && HAVE_POLL_H
86 # define EV_USE_POLL 1
87 # else
88 # define EV_USE_POLL 0
89 # endif
90 # endif
91
92 # ifndef EV_USE_EPOLL
93 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
94 # define EV_USE_EPOLL 1
95 # else
96 # define EV_USE_EPOLL 0
97 # endif
98 # endif
99
100 # ifndef EV_USE_KQUEUE
101 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
102 # define EV_USE_KQUEUE 1
103 # else
104 # define EV_USE_KQUEUE 0
105 # endif
106 # endif
107
108 # ifndef EV_USE_PORT
109 # if HAVE_PORT_H && HAVE_PORT_CREATE
110 # define EV_USE_PORT 1
111 # else
112 # define EV_USE_PORT 0
113 # endif
114 # endif
115
116 # ifndef EV_USE_INOTIFY
117 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
118 # define EV_USE_INOTIFY 1
119 # else
120 # define EV_USE_INOTIFY 0
121 # endif
122 # endif
123
124 # ifndef EV_USE_EVENTFD
125 # if HAVE_EVENTFD
126 # define EV_USE_EVENTFD 1
127 # else
128 # define EV_USE_EVENTFD 0
129 # endif
130 # endif
131
132 #endif
133
134 #include <math.h>
135 #include <stdlib.h>
136 #include <fcntl.h>
137 #include <stddef.h>
138
139 #include <stdio.h>
140
141 #include <assert.h>
142 #include <errno.h>
143 #include <sys/types.h>
144 #include <time.h>
145
146 #include <signal.h>
147
148 #ifdef EV_H
149 # include EV_H
150 #else
151 # include "ev.h"
152 #endif
153
154 #ifndef _WIN32
155 # include <sys/time.h>
156 # include <sys/wait.h>
157 # include <unistd.h>
158 #else
159 # define WIN32_LEAN_AND_MEAN
160 # include <windows.h>
161 # ifndef EV_SELECT_IS_WINSOCKET
162 # define EV_SELECT_IS_WINSOCKET 1
163 # endif
164 #endif
165
166 /* this block tries to deduce configuration from header-defined symbols and defaults */
167
168 #ifndef EV_USE_MONOTONIC
169 # define EV_USE_MONOTONIC 0
170 #endif
171
172 #ifndef EV_USE_REALTIME
173 # define EV_USE_REALTIME 0
174 #endif
175
176 #ifndef EV_USE_NANOSLEEP
177 # define EV_USE_NANOSLEEP 0
178 #endif
179
180 #ifndef EV_USE_SELECT
181 # define EV_USE_SELECT 1
182 #endif
183
184 #ifndef EV_USE_POLL
185 # ifdef _WIN32
186 # define EV_USE_POLL 0
187 # else
188 # define EV_USE_POLL 1
189 # endif
190 #endif
191
192 #ifndef EV_USE_EPOLL
193 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
194 # define EV_USE_EPOLL 1
195 # else
196 # define EV_USE_EPOLL 0
197 # endif
198 #endif
199
200 #ifndef EV_USE_KQUEUE
201 # define EV_USE_KQUEUE 0
202 #endif
203
204 #ifndef EV_USE_PORT
205 # define EV_USE_PORT 0
206 #endif
207
208 #ifndef EV_USE_INOTIFY
209 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
210 # define EV_USE_INOTIFY 1
211 # else
212 # define EV_USE_INOTIFY 0
213 # endif
214 #endif
215
216 #ifndef EV_PID_HASHSIZE
217 # if EV_MINIMAL
218 # define EV_PID_HASHSIZE 1
219 # else
220 # define EV_PID_HASHSIZE 16
221 # endif
222 #endif
223
224 #ifndef EV_INOTIFY_HASHSIZE
225 # if EV_MINIMAL
226 # define EV_INOTIFY_HASHSIZE 1
227 # else
228 # define EV_INOTIFY_HASHSIZE 16
229 # endif
230 #endif
231
232 #ifndef EV_USE_EVENTFD
233 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
234 # define EV_USE_EVENTFD 1
235 # else
236 # define EV_USE_EVENTFD 0
237 # endif
238 #endif
239
240 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
241
242 #ifndef CLOCK_MONOTONIC
243 # undef EV_USE_MONOTONIC
244 # define EV_USE_MONOTONIC 0
245 #endif
246
247 #ifndef CLOCK_REALTIME
248 # undef EV_USE_REALTIME
249 # define EV_USE_REALTIME 0
250 #endif
251
252 #if !EV_STAT_ENABLE
253 # undef EV_USE_INOTIFY
254 # define EV_USE_INOTIFY 0
255 #endif
256
257 #if !EV_USE_NANOSLEEP
258 # ifndef _WIN32
259 # include <sys/select.h>
260 # endif
261 #endif
262
263 #if EV_USE_INOTIFY
264 # include <sys/inotify.h>
265 #endif
266
267 #if EV_SELECT_IS_WINSOCKET
268 # include <winsock.h>
269 #endif
270
271 #if EV_USE_EVENTFD
272 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
273 # include <stdint.h>
274 # 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 *
366 ev_realloc_emul (void *ptr, long size)
367 {
368 /* some systems, notably openbsd and darwin, fail to properly
369 * implement realloc (x, 0) (as required by both ansi c-98 and
370 * the single unix specification, so work around them here.
371 */
372
373 if (size)
374 return realloc (ptr, size);
375
376 free (ptr);
377 return 0;
378 }
379
380 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
381
382 void
383 ev_set_allocator (void *(*cb)(void *ptr, long size))
384 {
385 alloc = cb;
386 }
387
388 inline_speed void *
389 ev_realloc (void *ptr, long size)
390 {
391 ptr = alloc (ptr, size);
392
393 if (!ptr && size)
394 {
395 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
396 abort ();
397 }
398
399 return ptr;
400 }
401
402 #define ev_malloc(size) ev_realloc (0, (size))
403 #define ev_free(ptr) ev_realloc ((ptr), 0)
404
405 /*****************************************************************************/
406
407 typedef struct
408 {
409 WL head;
410 unsigned char events;
411 unsigned char reify;
412 #if EV_SELECT_IS_WINSOCKET
413 SOCKET handle;
414 #endif
415 } ANFD;
416
417 typedef struct
418 {
419 W w;
420 int events;
421 } ANPENDING;
422
423 #if EV_USE_INOTIFY
424 typedef struct
425 {
426 WL head;
427 } ANFS;
428 #endif
429
430 #if EV_MULTIPLICITY
431
432 struct ev_loop
433 {
434 ev_tstamp ev_rt_now;
435 #define ev_rt_now ((loop)->ev_rt_now)
436 #define VAR(name,decl) decl;
437 #include "ev_vars.h"
438 #undef VAR
439 };
440 #include "ev_wrap.h"
441
442 static struct ev_loop default_loop_struct;
443 struct ev_loop *ev_default_loop_ptr;
444
445 #else
446
447 ev_tstamp ev_rt_now;
448 #define VAR(name,decl) static decl;
449 #include "ev_vars.h"
450 #undef VAR
451
452 static int ev_default_loop_ptr;
453
454 #endif
455
456 /*****************************************************************************/
457
458 ev_tstamp
459 ev_time (void)
460 {
461 #if EV_USE_REALTIME
462 struct timespec ts;
463 clock_gettime (CLOCK_REALTIME, &ts);
464 return ts.tv_sec + ts.tv_nsec * 1e-9;
465 #else
466 struct timeval tv;
467 gettimeofday (&tv, 0);
468 return tv.tv_sec + tv.tv_usec * 1e-6;
469 #endif
470 }
471
472 ev_tstamp inline_size
473 get_clock (void)
474 {
475 #if EV_USE_MONOTONIC
476 if (expect_true (have_monotonic))
477 {
478 struct timespec ts;
479 clock_gettime (CLOCK_MONOTONIC, &ts);
480 return ts.tv_sec + ts.tv_nsec * 1e-9;
481 }
482 #endif
483
484 return ev_time ();
485 }
486
487 #if EV_MULTIPLICITY
488 ev_tstamp
489 ev_now (EV_P)
490 {
491 return ev_rt_now;
492 }
493 #endif
494
495 void
496 ev_sleep (ev_tstamp delay)
497 {
498 if (delay > 0.)
499 {
500 #if EV_USE_NANOSLEEP
501 struct timespec ts;
502
503 ts.tv_sec = (time_t)delay;
504 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
505
506 nanosleep (&ts, 0);
507 #elif defined(_WIN32)
508 Sleep ((unsigned long)(delay * 1e3));
509 #else
510 struct timeval tv;
511
512 tv.tv_sec = (time_t)delay;
513 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
514
515 select (0, 0, 0, 0, &tv);
516 #endif
517 }
518 }
519
520 /*****************************************************************************/
521
522 int inline_size
523 array_nextsize (int elem, int cur, int cnt)
524 {
525 int ncur = cur + 1;
526
527 do
528 ncur <<= 1;
529 while (cnt > ncur);
530
531 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
532 if (elem * ncur > 4096)
533 {
534 ncur *= elem;
535 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
536 ncur = ncur - sizeof (void *) * 4;
537 ncur /= elem;
538 }
539
540 return ncur;
541 }
542
543 static noinline void *
544 array_realloc (int elem, void *base, int *cur, int cnt)
545 {
546 *cur = array_nextsize (elem, *cur, cnt);
547 return ev_realloc (base, elem * *cur);
548 }
549
550 #define array_needsize(type,base,cur,cnt,init) \
551 if (expect_false ((cnt) > (cur))) \
552 { \
553 int ocur_ = (cur); \
554 (base) = (type *)array_realloc \
555 (sizeof (type), (base), &(cur), (cnt)); \
556 init ((base) + (ocur_), (cur) - ocur_); \
557 }
558
559 #if 0
560 #define array_slim(type,stem) \
561 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
562 { \
563 stem ## max = array_roundsize (stem ## cnt >> 1); \
564 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
565 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
566 }
567 #endif
568
569 #define array_free(stem, idx) \
570 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
571
572 /*****************************************************************************/
573
574 void noinline
575 ev_feed_event (EV_P_ void *w, int revents)
576 {
577 W w_ = (W)w;
578 int pri = ABSPRI (w_);
579
580 if (expect_false (w_->pending))
581 pendings [pri][w_->pending - 1].events |= revents;
582 else
583 {
584 w_->pending = ++pendingcnt [pri];
585 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
586 pendings [pri][w_->pending - 1].w = w_;
587 pendings [pri][w_->pending - 1].events = revents;
588 }
589 }
590
591 void inline_speed
592 queue_events (EV_P_ W *events, int eventcnt, int type)
593 {
594 int i;
595
596 for (i = 0; i < eventcnt; ++i)
597 ev_feed_event (EV_A_ events [i], type);
598 }
599
600 /*****************************************************************************/
601
602 void inline_size
603 anfds_init (ANFD *base, int count)
604 {
605 while (count--)
606 {
607 base->head = 0;
608 base->events = EV_NONE;
609 base->reify = 0;
610
611 ++base;
612 }
613 }
614
615 void inline_speed
616 fd_event (EV_P_ int fd, int revents)
617 {
618 ANFD *anfd = anfds + fd;
619 ev_io *w;
620
621 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
622 {
623 int ev = w->events & revents;
624
625 if (ev)
626 ev_feed_event (EV_A_ (W)w, ev);
627 }
628 }
629
630 void
631 ev_feed_fd_event (EV_P_ int fd, int revents)
632 {
633 if (fd >= 0 && fd < anfdmax)
634 fd_event (EV_A_ fd, revents);
635 }
636
637 void inline_size
638 fd_reify (EV_P)
639 {
640 int i;
641
642 for (i = 0; i < fdchangecnt; ++i)
643 {
644 int fd = fdchanges [i];
645 ANFD *anfd = anfds + fd;
646 ev_io *w;
647
648 unsigned char events = 0;
649
650 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
651 events |= (unsigned char)w->events;
652
653 #if EV_SELECT_IS_WINSOCKET
654 if (events)
655 {
656 unsigned long argp;
657 #ifdef EV_FD_TO_WIN32_HANDLE
658 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
659 #else
660 anfd->handle = _get_osfhandle (fd);
661 #endif
662 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
663 }
664 #endif
665
666 {
667 unsigned char o_events = anfd->events;
668 unsigned char o_reify = anfd->reify;
669
670 anfd->reify = 0;
671 anfd->events = events;
672
673 if (o_events != events || o_reify & EV_IOFDSET)
674 backend_modify (EV_A_ fd, o_events, events);
675 }
676 }
677
678 fdchangecnt = 0;
679 }
680
681 void inline_size
682 fd_change (EV_P_ int fd, int flags)
683 {
684 unsigned char reify = anfds [fd].reify;
685 anfds [fd].reify |= flags;
686
687 if (expect_true (!reify))
688 {
689 ++fdchangecnt;
690 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
691 fdchanges [fdchangecnt - 1] = fd;
692 }
693 }
694
695 void inline_speed
696 fd_kill (EV_P_ int fd)
697 {
698 ev_io *w;
699
700 while ((w = (ev_io *)anfds [fd].head))
701 {
702 ev_io_stop (EV_A_ w);
703 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
704 }
705 }
706
707 int inline_size
708 fd_valid (int fd)
709 {
710 #ifdef _WIN32
711 return _get_osfhandle (fd) != -1;
712 #else
713 return fcntl (fd, F_GETFD) != -1;
714 #endif
715 }
716
717 /* called on EBADF to verify fds */
718 static void noinline
719 fd_ebadf (EV_P)
720 {
721 int fd;
722
723 for (fd = 0; fd < anfdmax; ++fd)
724 if (anfds [fd].events)
725 if (!fd_valid (fd) == -1 && errno == EBADF)
726 fd_kill (EV_A_ fd);
727 }
728
729 /* called on ENOMEM in select/poll to kill some fds and retry */
730 static void noinline
731 fd_enomem (EV_P)
732 {
733 int fd;
734
735 for (fd = anfdmax; fd--; )
736 if (anfds [fd].events)
737 {
738 fd_kill (EV_A_ fd);
739 return;
740 }
741 }
742
743 /* usually called after fork if backend needs to re-arm all fds from scratch */
744 static void noinline
745 fd_rearm_all (EV_P)
746 {
747 int fd;
748
749 for (fd = 0; fd < anfdmax; ++fd)
750 if (anfds [fd].events)
751 {
752 anfds [fd].events = 0;
753 fd_change (EV_A_ fd, EV_IOFDSET | 1);
754 }
755 }
756
757 /*****************************************************************************/
758
759 /* towards the root */
760 void inline_speed
761 upheap (WT *heap, int k)
762 {
763 WT w = heap [k];
764
765 while (k)
766 {
767 int p = (k - 1) >> 1;
768
769 if (heap [p]->at <= w->at)
770 break;
771
772 heap [k] = heap [p];
773 ((W)heap [k])->active = k + 1;
774 k = p;
775 }
776
777 heap [k] = w;
778 ((W)heap [k])->active = k + 1;
779 }
780
781 /* away from the root */
782 void inline_speed
783 downheap (WT *heap, int N, int k)
784 {
785 WT w = heap [k];
786
787 for (;;)
788 {
789 int c = (k << 1) + 1;
790
791 if (c >= N)
792 break;
793
794 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
795 ? 1 : 0;
796
797 if (w->at <= heap [c]->at)
798 break;
799
800 heap [k] = heap [c];
801 ((W)heap [k])->active = k + 1;
802
803 k = c;
804 }
805
806 heap [k] = w;
807 ((W)heap [k])->active = k + 1;
808 }
809
810 void inline_size
811 adjustheap (WT *heap, int N, int k)
812 {
813 upheap (heap, k);
814 downheap (heap, N, k);
815 }
816
817 /*****************************************************************************/
818
819 typedef struct
820 {
821 WL head;
822 EV_ATOMIC_T gotsig;
823 } ANSIG;
824
825 static ANSIG *signals;
826 static int signalmax;
827
828 static EV_ATOMIC_T gotsig;
829
830 void inline_size
831 signals_init (ANSIG *base, int count)
832 {
833 while (count--)
834 {
835 base->head = 0;
836 base->gotsig = 0;
837
838 ++base;
839 }
840 }
841
842 /*****************************************************************************/
843
844 void inline_speed
845 fd_intern (int fd)
846 {
847 #ifdef _WIN32
848 int arg = 1;
849 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
850 #else
851 fcntl (fd, F_SETFD, FD_CLOEXEC);
852 fcntl (fd, F_SETFL, O_NONBLOCK);
853 #endif
854 }
855
856 static void noinline
857 evpipe_init (EV_P)
858 {
859 if (!ev_is_active (&pipeev))
860 {
861 #if EV_USE_EVENTFD
862 if ((evfd = eventfd (0, 0)) >= 0)
863 {
864 evpipe [0] = -1;
865 fd_intern (evfd);
866 ev_io_set (&pipeev, evfd, EV_READ);
867 }
868 else
869 #endif
870 {
871 while (pipe (evpipe))
872 syserr ("(libev) error creating signal/async pipe");
873
874 fd_intern (evpipe [0]);
875 fd_intern (evpipe [1]);
876 ev_io_set (&pipeev, evpipe [0], EV_READ);
877 }
878
879 ev_io_start (EV_A_ &pipeev);
880 ev_unref (EV_A); /* watcher should not keep loop alive */
881 }
882 }
883
884 void inline_size
885 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
886 {
887 if (!*flag)
888 {
889 int old_errno = errno; /* save errno because write might clobber it */
890
891 *flag = 1;
892
893 #if EV_USE_EVENTFD
894 if (evfd >= 0)
895 {
896 uint64_t counter = 1;
897 write (evfd, &counter, sizeof (uint64_t));
898 }
899 else
900 #endif
901 write (evpipe [1], &old_errno, 1);
902
903 errno = old_errno;
904 }
905 }
906
907 static void
908 pipecb (EV_P_ ev_io *iow, int revents)
909 {
910 #if EV_USE_EVENTFD
911 if (evfd >= 0)
912 {
913 uint64_t counter = 1;
914 read (evfd, &counter, sizeof (uint64_t));
915 }
916 else
917 #endif
918 {
919 char dummy;
920 read (evpipe [0], &dummy, 1);
921 }
922
923 if (gotsig && ev_is_default_loop (EV_A))
924 {
925 int signum;
926 gotsig = 0;
927
928 for (signum = signalmax; signum--; )
929 if (signals [signum].gotsig)
930 ev_feed_signal_event (EV_A_ signum + 1);
931 }
932
933 #if EV_ASYNC_ENABLE
934 if (gotasync)
935 {
936 int i;
937 gotasync = 0;
938
939 for (i = asynccnt; i--; )
940 if (asyncs [i]->sent)
941 {
942 asyncs [i]->sent = 0;
943 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
944 }
945 }
946 #endif
947 }
948
949 /*****************************************************************************/
950
951 static void
952 ev_sighandler (int signum)
953 {
954 #if EV_MULTIPLICITY
955 struct ev_loop *loop = &default_loop_struct;
956 #endif
957
958 #if _WIN32
959 signal (signum, ev_sighandler);
960 #endif
961
962 signals [signum - 1].gotsig = 1;
963 evpipe_write (EV_A_ &gotsig);
964 }
965
966 void noinline
967 ev_feed_signal_event (EV_P_ int signum)
968 {
969 WL w;
970
971 #if EV_MULTIPLICITY
972 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
973 #endif
974
975 --signum;
976
977 if (signum < 0 || signum >= signalmax)
978 return;
979
980 signals [signum].gotsig = 0;
981
982 for (w = signals [signum].head; w; w = w->next)
983 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
984 }
985
986 /*****************************************************************************/
987
988 static WL childs [EV_PID_HASHSIZE];
989
990 #ifndef _WIN32
991
992 static ev_signal childev;
993
994 #ifndef WIFCONTINUED
995 # define WIFCONTINUED(status) 0
996 #endif
997
998 void inline_speed
999 child_reap (EV_P_ int chain, int pid, int status)
1000 {
1001 ev_child *w;
1002 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1003
1004 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1005 {
1006 if ((w->pid == pid || !w->pid)
1007 && (!traced || (w->flags & 1)))
1008 {
1009 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1010 w->rpid = pid;
1011 w->rstatus = status;
1012 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1013 }
1014 }
1015 }
1016
1017 #ifndef WCONTINUED
1018 # define WCONTINUED 0
1019 #endif
1020
1021 static void
1022 childcb (EV_P_ ev_signal *sw, int revents)
1023 {
1024 int pid, status;
1025
1026 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1027 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1028 if (!WCONTINUED
1029 || errno != EINVAL
1030 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1031 return;
1032
1033 /* make sure we are called again until all children have been reaped */
1034 /* we need to do it this way so that the callback gets called before we continue */
1035 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1036
1037 child_reap (EV_A_ pid, pid, status);
1038 if (EV_PID_HASHSIZE > 1)
1039 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1040 }
1041
1042 #endif
1043
1044 /*****************************************************************************/
1045
1046 #if EV_USE_PORT
1047 # include "ev_port.c"
1048 #endif
1049 #if EV_USE_KQUEUE
1050 # include "ev_kqueue.c"
1051 #endif
1052 #if EV_USE_EPOLL
1053 # include "ev_epoll.c"
1054 #endif
1055 #if EV_USE_POLL
1056 # include "ev_poll.c"
1057 #endif
1058 #if EV_USE_SELECT
1059 # include "ev_select.c"
1060 #endif
1061
1062 int
1063 ev_version_major (void)
1064 {
1065 return EV_VERSION_MAJOR;
1066 }
1067
1068 int
1069 ev_version_minor (void)
1070 {
1071 return EV_VERSION_MINOR;
1072 }
1073
1074 /* return true if we are running with elevated privileges and should ignore env variables */
1075 int inline_size
1076 enable_secure (void)
1077 {
1078 #ifdef _WIN32
1079 return 0;
1080 #else
1081 return getuid () != geteuid ()
1082 || getgid () != getegid ();
1083 #endif
1084 }
1085
1086 unsigned int
1087 ev_supported_backends (void)
1088 {
1089 unsigned int flags = 0;
1090
1091 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1092 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1093 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1094 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1095 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1096
1097 return flags;
1098 }
1099
1100 unsigned int
1101 ev_recommended_backends (void)
1102 {
1103 unsigned int flags = ev_supported_backends ();
1104
1105 #ifndef __NetBSD__
1106 /* kqueue is borked on everything but netbsd apparently */
1107 /* it usually doesn't work correctly on anything but sockets and pipes */
1108 flags &= ~EVBACKEND_KQUEUE;
1109 #endif
1110 #ifdef __APPLE__
1111 // flags &= ~EVBACKEND_KQUEUE; for documentation
1112 flags &= ~EVBACKEND_POLL;
1113 #endif
1114
1115 return flags;
1116 }
1117
1118 unsigned int
1119 ev_embeddable_backends (void)
1120 {
1121 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1122
1123 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1124 /* please fix it and tell me how to detect the fix */
1125 flags &= ~EVBACKEND_EPOLL;
1126
1127 return flags;
1128 }
1129
1130 unsigned int
1131 ev_backend (EV_P)
1132 {
1133 return backend;
1134 }
1135
1136 unsigned int
1137 ev_loop_count (EV_P)
1138 {
1139 return loop_count;
1140 }
1141
1142 void
1143 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1144 {
1145 io_blocktime = interval;
1146 }
1147
1148 void
1149 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1150 {
1151 timeout_blocktime = interval;
1152 }
1153
1154 static void noinline
1155 loop_init (EV_P_ unsigned int flags)
1156 {
1157 if (!backend)
1158 {
1159 #if EV_USE_MONOTONIC
1160 {
1161 struct timespec ts;
1162 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1163 have_monotonic = 1;
1164 }
1165 #endif
1166
1167 ev_rt_now = ev_time ();
1168 mn_now = get_clock ();
1169 now_floor = mn_now;
1170 rtmn_diff = ev_rt_now - mn_now;
1171
1172 io_blocktime = 0.;
1173 timeout_blocktime = 0.;
1174 backend = 0;
1175 backend_fd = -1;
1176 gotasync = 0;
1177 #if EV_USE_INOTIFY
1178 fs_fd = -2;
1179 #endif
1180
1181 /* pid check not overridable via env */
1182 #ifndef _WIN32
1183 if (flags & EVFLAG_FORKCHECK)
1184 curpid = getpid ();
1185 #endif
1186
1187 if (!(flags & EVFLAG_NOENV)
1188 && !enable_secure ()
1189 && getenv ("LIBEV_FLAGS"))
1190 flags = atoi (getenv ("LIBEV_FLAGS"));
1191
1192 if (!(flags & 0x0000ffffU))
1193 flags |= ev_recommended_backends ();
1194
1195 #if EV_USE_PORT
1196 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1197 #endif
1198 #if EV_USE_KQUEUE
1199 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1200 #endif
1201 #if EV_USE_EPOLL
1202 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1203 #endif
1204 #if EV_USE_POLL
1205 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1206 #endif
1207 #if EV_USE_SELECT
1208 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1209 #endif
1210
1211 ev_init (&pipeev, pipecb);
1212 ev_set_priority (&pipeev, EV_MAXPRI);
1213 }
1214 }
1215
1216 static void noinline
1217 loop_destroy (EV_P)
1218 {
1219 int i;
1220
1221 if (ev_is_active (&pipeev))
1222 {
1223 ev_ref (EV_A); /* signal watcher */
1224 ev_io_stop (EV_A_ &pipeev);
1225
1226 #if EV_USE_EVENTFD
1227 if (evfd >= 0)
1228 close (evfd);
1229 #endif
1230
1231 if (evpipe [0] >= 0)
1232 {
1233 close (evpipe [0]);
1234 close (evpipe [1]);
1235 }
1236 }
1237
1238 #if EV_USE_INOTIFY
1239 if (fs_fd >= 0)
1240 close (fs_fd);
1241 #endif
1242
1243 if (backend_fd >= 0)
1244 close (backend_fd);
1245
1246 #if EV_USE_PORT
1247 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1248 #endif
1249 #if EV_USE_KQUEUE
1250 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1251 #endif
1252 #if EV_USE_EPOLL
1253 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1254 #endif
1255 #if EV_USE_POLL
1256 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1257 #endif
1258 #if EV_USE_SELECT
1259 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1260 #endif
1261
1262 for (i = NUMPRI; i--; )
1263 {
1264 array_free (pending, [i]);
1265 #if EV_IDLE_ENABLE
1266 array_free (idle, [i]);
1267 #endif
1268 }
1269
1270 ev_free (anfds); anfdmax = 0;
1271
1272 /* have to use the microsoft-never-gets-it-right macro */
1273 array_free (fdchange, EMPTY);
1274 array_free (timer, EMPTY);
1275 #if EV_PERIODIC_ENABLE
1276 array_free (periodic, EMPTY);
1277 #endif
1278 #if EV_FORK_ENABLE
1279 array_free (fork, EMPTY);
1280 #endif
1281 array_free (prepare, EMPTY);
1282 array_free (check, EMPTY);
1283 #if EV_ASYNC_ENABLE
1284 array_free (async, EMPTY);
1285 #endif
1286
1287 backend = 0;
1288 }
1289
1290 #if EV_USE_INOTIFY
1291 void inline_size infy_fork (EV_P);
1292 #endif
1293
1294 void inline_size
1295 loop_fork (EV_P)
1296 {
1297 #if EV_USE_PORT
1298 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1299 #endif
1300 #if EV_USE_KQUEUE
1301 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1302 #endif
1303 #if EV_USE_EPOLL
1304 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1305 #endif
1306 #if EV_USE_INOTIFY
1307 infy_fork (EV_A);
1308 #endif
1309
1310 if (ev_is_active (&pipeev))
1311 {
1312 /* this "locks" the handlers against writing to the pipe */
1313 /* while we modify the fd vars */
1314 gotsig = 1;
1315 #if EV_ASYNC_ENABLE
1316 gotasync = 1;
1317 #endif
1318
1319 ev_ref (EV_A);
1320 ev_io_stop (EV_A_ &pipeev);
1321
1322 #if EV_USE_EVENTFD
1323 if (evfd >= 0)
1324 close (evfd);
1325 #endif
1326
1327 if (evpipe [0] >= 0)
1328 {
1329 close (evpipe [0]);
1330 close (evpipe [1]);
1331 }
1332
1333 evpipe_init (EV_A);
1334 /* now iterate over everything, in case we missed something */
1335 pipecb (EV_A_ &pipeev, EV_READ);
1336 }
1337
1338 postfork = 0;
1339 }
1340
1341 #if EV_MULTIPLICITY
1342 struct ev_loop *
1343 ev_loop_new (unsigned int flags)
1344 {
1345 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1346
1347 memset (loop, 0, sizeof (struct ev_loop));
1348
1349 loop_init (EV_A_ flags);
1350
1351 if (ev_backend (EV_A))
1352 return loop;
1353
1354 return 0;
1355 }
1356
1357 void
1358 ev_loop_destroy (EV_P)
1359 {
1360 loop_destroy (EV_A);
1361 ev_free (loop);
1362 }
1363
1364 void
1365 ev_loop_fork (EV_P)
1366 {
1367 postfork = 1; /* must be in line with ev_default_fork */
1368 }
1369
1370 #endif
1371
1372 #if EV_MULTIPLICITY
1373 struct ev_loop *
1374 ev_default_loop_init (unsigned int flags)
1375 #else
1376 int
1377 ev_default_loop (unsigned int flags)
1378 #endif
1379 {
1380 if (!ev_default_loop_ptr)
1381 {
1382 #if EV_MULTIPLICITY
1383 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1384 #else
1385 ev_default_loop_ptr = 1;
1386 #endif
1387
1388 loop_init (EV_A_ flags);
1389
1390 if (ev_backend (EV_A))
1391 {
1392 #ifndef _WIN32
1393 ev_signal_init (&childev, childcb, SIGCHLD);
1394 ev_set_priority (&childev, EV_MAXPRI);
1395 ev_signal_start (EV_A_ &childev);
1396 ev_unref (EV_A); /* child watcher should not keep loop alive */
1397 #endif
1398 }
1399 else
1400 ev_default_loop_ptr = 0;
1401 }
1402
1403 return ev_default_loop_ptr;
1404 }
1405
1406 void
1407 ev_default_destroy (void)
1408 {
1409 #if EV_MULTIPLICITY
1410 struct ev_loop *loop = ev_default_loop_ptr;
1411 #endif
1412
1413 #ifndef _WIN32
1414 ev_ref (EV_A); /* child watcher */
1415 ev_signal_stop (EV_A_ &childev);
1416 #endif
1417
1418 loop_destroy (EV_A);
1419 }
1420
1421 void
1422 ev_default_fork (void)
1423 {
1424 #if EV_MULTIPLICITY
1425 struct ev_loop *loop = ev_default_loop_ptr;
1426 #endif
1427
1428 if (backend)
1429 postfork = 1; /* must be in line with ev_loop_fork */
1430 }
1431
1432 /*****************************************************************************/
1433
1434 void
1435 ev_invoke (EV_P_ void *w, int revents)
1436 {
1437 EV_CB_INVOKE ((W)w, revents);
1438 }
1439
1440 void inline_speed
1441 call_pending (EV_P)
1442 {
1443 int pri;
1444
1445 for (pri = NUMPRI; pri--; )
1446 while (pendingcnt [pri])
1447 {
1448 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1449
1450 if (expect_true (p->w))
1451 {
1452 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1453
1454 p->w->pending = 0;
1455 EV_CB_INVOKE (p->w, p->events);
1456 }
1457 }
1458 }
1459
1460 void inline_size
1461 timers_reify (EV_P)
1462 {
1463 while (timercnt && ((WT)timers [0])->at <= mn_now)
1464 {
1465 ev_timer *w = (ev_timer *)timers [0];
1466
1467 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1468
1469 /* first reschedule or stop timer */
1470 if (w->repeat)
1471 {
1472 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1473
1474 ((WT)w)->at += w->repeat;
1475 if (((WT)w)->at < mn_now)
1476 ((WT)w)->at = mn_now;
1477
1478 downheap (timers, timercnt, 0);
1479 }
1480 else
1481 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1482
1483 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1484 }
1485 }
1486
1487 #if EV_PERIODIC_ENABLE
1488 void inline_size
1489 periodics_reify (EV_P)
1490 {
1491 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1492 {
1493 ev_periodic *w = (ev_periodic *)periodics [0];
1494
1495 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1496
1497 /* first reschedule or stop timer */
1498 if (w->reschedule_cb)
1499 {
1500 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1501 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1502 downheap (periodics, periodiccnt, 0);
1503 }
1504 else if (w->interval)
1505 {
1506 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1507 if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
1508 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1509 downheap (periodics, periodiccnt, 0);
1510 }
1511 else
1512 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1513
1514 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1515 }
1516 }
1517
1518 static void noinline
1519 periodics_reschedule (EV_P)
1520 {
1521 int i;
1522
1523 /* adjust periodics after time jump */
1524 for (i = 0; i < periodiccnt; ++i)
1525 {
1526 ev_periodic *w = (ev_periodic *)periodics [i];
1527
1528 if (w->reschedule_cb)
1529 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1530 else if (w->interval)
1531 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1532 }
1533
1534 /* now rebuild the heap */
1535 for (i = periodiccnt >> 1; i--; )
1536 downheap (periodics, periodiccnt, i);
1537 }
1538 #endif
1539
1540 #if EV_IDLE_ENABLE
1541 void inline_size
1542 idle_reify (EV_P)
1543 {
1544 if (expect_false (idleall))
1545 {
1546 int pri;
1547
1548 for (pri = NUMPRI; pri--; )
1549 {
1550 if (pendingcnt [pri])
1551 break;
1552
1553 if (idlecnt [pri])
1554 {
1555 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1556 break;
1557 }
1558 }
1559 }
1560 }
1561 #endif
1562
1563 void inline_speed
1564 time_update (EV_P_ ev_tstamp max_block)
1565 {
1566 int i;
1567
1568 #if EV_USE_MONOTONIC
1569 if (expect_true (have_monotonic))
1570 {
1571 ev_tstamp odiff = rtmn_diff;
1572
1573 mn_now = get_clock ();
1574
1575 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1576 /* interpolate in the meantime */
1577 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1578 {
1579 ev_rt_now = rtmn_diff + mn_now;
1580 return;
1581 }
1582
1583 now_floor = mn_now;
1584 ev_rt_now = ev_time ();
1585
1586 /* loop a few times, before making important decisions.
1587 * on the choice of "4": one iteration isn't enough,
1588 * in case we get preempted during the calls to
1589 * ev_time and get_clock. a second call is almost guaranteed
1590 * to succeed in that case, though. and looping a few more times
1591 * doesn't hurt either as we only do this on time-jumps or
1592 * in the unlikely event of having been preempted here.
1593 */
1594 for (i = 4; --i; )
1595 {
1596 rtmn_diff = ev_rt_now - mn_now;
1597
1598 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1599 return; /* all is well */
1600
1601 ev_rt_now = ev_time ();
1602 mn_now = get_clock ();
1603 now_floor = mn_now;
1604 }
1605
1606 # if EV_PERIODIC_ENABLE
1607 periodics_reschedule (EV_A);
1608 # endif
1609 /* no timer adjustment, as the monotonic clock doesn't jump */
1610 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1611 }
1612 else
1613 #endif
1614 {
1615 ev_rt_now = ev_time ();
1616
1617 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1618 {
1619 #if EV_PERIODIC_ENABLE
1620 periodics_reschedule (EV_A);
1621 #endif
1622 /* adjust timers. this is easy, as the offset is the same for all of them */
1623 for (i = 0; i < timercnt; ++i)
1624 ((WT)timers [i])->at += ev_rt_now - mn_now;
1625 }
1626
1627 mn_now = ev_rt_now;
1628 }
1629 }
1630
1631 void
1632 ev_ref (EV_P)
1633 {
1634 ++activecnt;
1635 }
1636
1637 void
1638 ev_unref (EV_P)
1639 {
1640 --activecnt;
1641 }
1642
1643 static int loop_done;
1644
1645 void
1646 ev_loop (EV_P_ int flags)
1647 {
1648 loop_done = EVUNLOOP_CANCEL;
1649
1650 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1651
1652 do
1653 {
1654 #ifndef _WIN32
1655 if (expect_false (curpid)) /* penalise the forking check even more */
1656 if (expect_false (getpid () != curpid))
1657 {
1658 curpid = getpid ();
1659 postfork = 1;
1660 }
1661 #endif
1662
1663 #if EV_FORK_ENABLE
1664 /* we might have forked, so queue fork handlers */
1665 if (expect_false (postfork))
1666 if (forkcnt)
1667 {
1668 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1669 call_pending (EV_A);
1670 }
1671 #endif
1672
1673 /* queue prepare watchers (and execute them) */
1674 if (expect_false (preparecnt))
1675 {
1676 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1677 call_pending (EV_A);
1678 }
1679
1680 if (expect_false (!activecnt))
1681 break;
1682
1683 /* we might have forked, so reify kernel state if necessary */
1684 if (expect_false (postfork))
1685 loop_fork (EV_A);
1686
1687 /* update fd-related kernel structures */
1688 fd_reify (EV_A);
1689
1690 /* calculate blocking time */
1691 {
1692 ev_tstamp waittime = 0.;
1693 ev_tstamp sleeptime = 0.;
1694
1695 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1696 {
1697 /* update time to cancel out callback processing overhead */
1698 time_update (EV_A_ 1e100);
1699
1700 waittime = MAX_BLOCKTIME;
1701
1702 if (timercnt)
1703 {
1704 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1705 if (waittime > to) waittime = to;
1706 }
1707
1708 #if EV_PERIODIC_ENABLE
1709 if (periodiccnt)
1710 {
1711 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1712 if (waittime > to) waittime = to;
1713 }
1714 #endif
1715
1716 if (expect_false (waittime < timeout_blocktime))
1717 waittime = timeout_blocktime;
1718
1719 sleeptime = waittime - backend_fudge;
1720
1721 if (expect_true (sleeptime > io_blocktime))
1722 sleeptime = io_blocktime;
1723
1724 if (sleeptime)
1725 {
1726 ev_sleep (sleeptime);
1727 waittime -= sleeptime;
1728 }
1729 }
1730
1731 ++loop_count;
1732 backend_poll (EV_A_ waittime);
1733
1734 /* update ev_rt_now, do magic */
1735 time_update (EV_A_ waittime + sleeptime);
1736 }
1737
1738 /* queue pending timers and reschedule them */
1739 timers_reify (EV_A); /* relative timers called last */
1740 #if EV_PERIODIC_ENABLE
1741 periodics_reify (EV_A); /* absolute timers called first */
1742 #endif
1743
1744 #if EV_IDLE_ENABLE
1745 /* queue idle watchers unless other events are pending */
1746 idle_reify (EV_A);
1747 #endif
1748
1749 /* queue check watchers, to be executed first */
1750 if (expect_false (checkcnt))
1751 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1752
1753 call_pending (EV_A);
1754 }
1755 while (expect_true (
1756 activecnt
1757 && !loop_done
1758 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
1759 ));
1760
1761 if (loop_done == EVUNLOOP_ONE)
1762 loop_done = EVUNLOOP_CANCEL;
1763 }
1764
1765 void
1766 ev_unloop (EV_P_ int how)
1767 {
1768 loop_done = how;
1769 }
1770
1771 /*****************************************************************************/
1772
1773 void inline_size
1774 wlist_add (WL *head, WL elem)
1775 {
1776 elem->next = *head;
1777 *head = elem;
1778 }
1779
1780 void inline_size
1781 wlist_del (WL *head, WL elem)
1782 {
1783 while (*head)
1784 {
1785 if (*head == elem)
1786 {
1787 *head = elem->next;
1788 return;
1789 }
1790
1791 head = &(*head)->next;
1792 }
1793 }
1794
1795 void inline_speed
1796 clear_pending (EV_P_ W w)
1797 {
1798 if (w->pending)
1799 {
1800 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1801 w->pending = 0;
1802 }
1803 }
1804
1805 int
1806 ev_clear_pending (EV_P_ void *w)
1807 {
1808 W w_ = (W)w;
1809 int pending = w_->pending;
1810
1811 if (expect_true (pending))
1812 {
1813 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1814 w_->pending = 0;
1815 p->w = 0;
1816 return p->events;
1817 }
1818 else
1819 return 0;
1820 }
1821
1822 void inline_size
1823 pri_adjust (EV_P_ W w)
1824 {
1825 int pri = w->priority;
1826 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1827 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1828 w->priority = pri;
1829 }
1830
1831 void inline_speed
1832 ev_start (EV_P_ W w, int active)
1833 {
1834 pri_adjust (EV_A_ w);
1835 w->active = active;
1836 ev_ref (EV_A);
1837 }
1838
1839 void inline_size
1840 ev_stop (EV_P_ W w)
1841 {
1842 ev_unref (EV_A);
1843 w->active = 0;
1844 }
1845
1846 /*****************************************************************************/
1847
1848 void noinline
1849 ev_io_start (EV_P_ ev_io *w)
1850 {
1851 int fd = w->fd;
1852
1853 if (expect_false (ev_is_active (w)))
1854 return;
1855
1856 assert (("ev_io_start called with negative fd", fd >= 0));
1857
1858 ev_start (EV_A_ (W)w, 1);
1859 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1860 wlist_add (&anfds[fd].head, (WL)w);
1861
1862 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1863 w->events &= ~EV_IOFDSET;
1864 }
1865
1866 void noinline
1867 ev_io_stop (EV_P_ ev_io *w)
1868 {
1869 clear_pending (EV_A_ (W)w);
1870 if (expect_false (!ev_is_active (w)))
1871 return;
1872
1873 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1874
1875 wlist_del (&anfds[w->fd].head, (WL)w);
1876 ev_stop (EV_A_ (W)w);
1877
1878 fd_change (EV_A_ w->fd, 1);
1879 }
1880
1881 void noinline
1882 ev_timer_start (EV_P_ ev_timer *w)
1883 {
1884 if (expect_false (ev_is_active (w)))
1885 return;
1886
1887 ((WT)w)->at += mn_now;
1888
1889 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1890
1891 ev_start (EV_A_ (W)w, ++timercnt);
1892 array_needsize (WT, timers, timermax, timercnt, EMPTY2);
1893 timers [timercnt - 1] = (WT)w;
1894 upheap (timers, timercnt - 1);
1895
1896 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1897 }
1898
1899 void noinline
1900 ev_timer_stop (EV_P_ ev_timer *w)
1901 {
1902 clear_pending (EV_A_ (W)w);
1903 if (expect_false (!ev_is_active (w)))
1904 return;
1905
1906 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
1907
1908 {
1909 int active = ((W)w)->active;
1910
1911 if (expect_true (--active < --timercnt))
1912 {
1913 timers [active] = timers [timercnt];
1914 adjustheap (timers, timercnt, active);
1915 }
1916 }
1917
1918 ((WT)w)->at -= mn_now;
1919
1920 ev_stop (EV_A_ (W)w);
1921 }
1922
1923 void noinline
1924 ev_timer_again (EV_P_ ev_timer *w)
1925 {
1926 if (ev_is_active (w))
1927 {
1928 if (w->repeat)
1929 {
1930 ((WT)w)->at = mn_now + w->repeat;
1931 adjustheap (timers, timercnt, ((W)w)->active - 1);
1932 }
1933 else
1934 ev_timer_stop (EV_A_ w);
1935 }
1936 else if (w->repeat)
1937 {
1938 w->at = w->repeat;
1939 ev_timer_start (EV_A_ w);
1940 }
1941 }
1942
1943 #if EV_PERIODIC_ENABLE
1944 void noinline
1945 ev_periodic_start (EV_P_ ev_periodic *w)
1946 {
1947 if (expect_false (ev_is_active (w)))
1948 return;
1949
1950 if (w->reschedule_cb)
1951 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1952 else if (w->interval)
1953 {
1954 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1955 /* this formula differs from the one in periodic_reify because we do not always round up */
1956 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1957 }
1958 else
1959 ((WT)w)->at = w->offset;
1960
1961 ev_start (EV_A_ (W)w, ++periodiccnt);
1962 array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
1963 periodics [periodiccnt - 1] = (WT)w;
1964 upheap (periodics, periodiccnt - 1);
1965
1966 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1967 }
1968
1969 void noinline
1970 ev_periodic_stop (EV_P_ ev_periodic *w)
1971 {
1972 clear_pending (EV_A_ (W)w);
1973 if (expect_false (!ev_is_active (w)))
1974 return;
1975
1976 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
1977
1978 {
1979 int active = ((W)w)->active;
1980
1981 if (expect_true (--active < --periodiccnt))
1982 {
1983 periodics [active] = periodics [periodiccnt];
1984 adjustheap (periodics, periodiccnt, active);
1985 }
1986 }
1987
1988 ev_stop (EV_A_ (W)w);
1989 }
1990
1991 void noinline
1992 ev_periodic_again (EV_P_ ev_periodic *w)
1993 {
1994 /* TODO: use adjustheap and recalculation */
1995 ev_periodic_stop (EV_A_ w);
1996 ev_periodic_start (EV_A_ w);
1997 }
1998 #endif
1999
2000 #ifndef SA_RESTART
2001 # define SA_RESTART 0
2002 #endif
2003
2004 void noinline
2005 ev_signal_start (EV_P_ ev_signal *w)
2006 {
2007 #if EV_MULTIPLICITY
2008 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2009 #endif
2010 if (expect_false (ev_is_active (w)))
2011 return;
2012
2013 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2014
2015 evpipe_init (EV_A);
2016
2017 {
2018 #ifndef _WIN32
2019 sigset_t full, prev;
2020 sigfillset (&full);
2021 sigprocmask (SIG_SETMASK, &full, &prev);
2022 #endif
2023
2024 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2025
2026 #ifndef _WIN32
2027 sigprocmask (SIG_SETMASK, &prev, 0);
2028 #endif
2029 }
2030
2031 ev_start (EV_A_ (W)w, 1);
2032 wlist_add (&signals [w->signum - 1].head, (WL)w);
2033
2034 if (!((WL)w)->next)
2035 {
2036 #if _WIN32
2037 signal (w->signum, ev_sighandler);
2038 #else
2039 struct sigaction sa;
2040 sa.sa_handler = ev_sighandler;
2041 sigfillset (&sa.sa_mask);
2042 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2043 sigaction (w->signum, &sa, 0);
2044 #endif
2045 }
2046 }
2047
2048 void noinline
2049 ev_signal_stop (EV_P_ ev_signal *w)
2050 {
2051 clear_pending (EV_A_ (W)w);
2052 if (expect_false (!ev_is_active (w)))
2053 return;
2054
2055 wlist_del (&signals [w->signum - 1].head, (WL)w);
2056 ev_stop (EV_A_ (W)w);
2057
2058 if (!signals [w->signum - 1].head)
2059 signal (w->signum, SIG_DFL);
2060 }
2061
2062 void
2063 ev_child_start (EV_P_ ev_child *w)
2064 {
2065 #if EV_MULTIPLICITY
2066 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2067 #endif
2068 if (expect_false (ev_is_active (w)))
2069 return;
2070
2071 ev_start (EV_A_ (W)w, 1);
2072 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2073 }
2074
2075 void
2076 ev_child_stop (EV_P_ ev_child *w)
2077 {
2078 clear_pending (EV_A_ (W)w);
2079 if (expect_false (!ev_is_active (w)))
2080 return;
2081
2082 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2083 ev_stop (EV_A_ (W)w);
2084 }
2085
2086 #if EV_STAT_ENABLE
2087
2088 # ifdef _WIN32
2089 # undef lstat
2090 # define lstat(a,b) _stati64 (a,b)
2091 # endif
2092
2093 #define DEF_STAT_INTERVAL 5.0074891
2094 #define MIN_STAT_INTERVAL 0.1074891
2095
2096 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2097
2098 #if EV_USE_INOTIFY
2099 # define EV_INOTIFY_BUFSIZE 8192
2100
2101 static void noinline
2102 infy_add (EV_P_ ev_stat *w)
2103 {
2104 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);
2105
2106 if (w->wd < 0)
2107 {
2108 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2109
2110 /* monitor some parent directory for speedup hints */
2111 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2112 {
2113 char path [4096];
2114 strcpy (path, w->path);
2115
2116 do
2117 {
2118 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2119 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2120
2121 char *pend = strrchr (path, '/');
2122
2123 if (!pend)
2124 break; /* whoops, no '/', complain to your admin */
2125
2126 *pend = 0;
2127 w->wd = inotify_add_watch (fs_fd, path, mask);
2128 }
2129 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2130 }
2131 }
2132 else
2133 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2134
2135 if (w->wd >= 0)
2136 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2137 }
2138
2139 static void noinline
2140 infy_del (EV_P_ ev_stat *w)
2141 {
2142 int slot;
2143 int wd = w->wd;
2144
2145 if (wd < 0)
2146 return;
2147
2148 w->wd = -2;
2149 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2150 wlist_del (&fs_hash [slot].head, (WL)w);
2151
2152 /* remove this watcher, if others are watching it, they will rearm */
2153 inotify_rm_watch (fs_fd, wd);
2154 }
2155
2156 static void noinline
2157 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2158 {
2159 if (slot < 0)
2160 /* overflow, need to check for all hahs slots */
2161 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2162 infy_wd (EV_A_ slot, wd, ev);
2163 else
2164 {
2165 WL w_;
2166
2167 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2168 {
2169 ev_stat *w = (ev_stat *)w_;
2170 w_ = w_->next; /* lets us remove this watcher and all before it */
2171
2172 if (w->wd == wd || wd == -1)
2173 {
2174 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2175 {
2176 w->wd = -1;
2177 infy_add (EV_A_ w); /* re-add, no matter what */
2178 }
2179
2180 stat_timer_cb (EV_A_ &w->timer, 0);
2181 }
2182 }
2183 }
2184 }
2185
2186 static void
2187 infy_cb (EV_P_ ev_io *w, int revents)
2188 {
2189 char buf [EV_INOTIFY_BUFSIZE];
2190 struct inotify_event *ev = (struct inotify_event *)buf;
2191 int ofs;
2192 int len = read (fs_fd, buf, sizeof (buf));
2193
2194 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2195 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2196 }
2197
2198 void inline_size
2199 infy_init (EV_P)
2200 {
2201 if (fs_fd != -2)
2202 return;
2203
2204 fs_fd = inotify_init ();
2205
2206 if (fs_fd >= 0)
2207 {
2208 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2209 ev_set_priority (&fs_w, EV_MAXPRI);
2210 ev_io_start (EV_A_ &fs_w);
2211 }
2212 }
2213
2214 void inline_size
2215 infy_fork (EV_P)
2216 {
2217 int slot;
2218
2219 if (fs_fd < 0)
2220 return;
2221
2222 close (fs_fd);
2223 fs_fd = inotify_init ();
2224
2225 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2226 {
2227 WL w_ = fs_hash [slot].head;
2228 fs_hash [slot].head = 0;
2229
2230 while (w_)
2231 {
2232 ev_stat *w = (ev_stat *)w_;
2233 w_ = w_->next; /* lets us add this watcher */
2234
2235 w->wd = -1;
2236
2237 if (fs_fd >= 0)
2238 infy_add (EV_A_ w); /* re-add, no matter what */
2239 else
2240 ev_timer_start (EV_A_ &w->timer);
2241 }
2242
2243 }
2244 }
2245
2246 #endif
2247
2248 void
2249 ev_stat_stat (EV_P_ ev_stat *w)
2250 {
2251 if (lstat (w->path, &w->attr) < 0)
2252 w->attr.st_nlink = 0;
2253 else if (!w->attr.st_nlink)
2254 w->attr.st_nlink = 1;
2255 }
2256
2257 static void noinline
2258 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2259 {
2260 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2261
2262 /* we copy this here each the time so that */
2263 /* prev has the old value when the callback gets invoked */
2264 w->prev = w->attr;
2265 ev_stat_stat (EV_A_ w);
2266
2267 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2268 if (
2269 w->prev.st_dev != w->attr.st_dev
2270 || w->prev.st_ino != w->attr.st_ino
2271 || w->prev.st_mode != w->attr.st_mode
2272 || w->prev.st_nlink != w->attr.st_nlink
2273 || w->prev.st_uid != w->attr.st_uid
2274 || w->prev.st_gid != w->attr.st_gid
2275 || w->prev.st_rdev != w->attr.st_rdev
2276 || w->prev.st_size != w->attr.st_size
2277 || w->prev.st_atime != w->attr.st_atime
2278 || w->prev.st_mtime != w->attr.st_mtime
2279 || w->prev.st_ctime != w->attr.st_ctime
2280 ) {
2281 #if EV_USE_INOTIFY
2282 infy_del (EV_A_ w);
2283 infy_add (EV_A_ w);
2284 ev_stat_stat (EV_A_ w); /* avoid race... */
2285 #endif
2286
2287 ev_feed_event (EV_A_ w, EV_STAT);
2288 }
2289 }
2290
2291 void
2292 ev_stat_start (EV_P_ ev_stat *w)
2293 {
2294 if (expect_false (ev_is_active (w)))
2295 return;
2296
2297 /* since we use memcmp, we need to clear any padding data etc. */
2298 memset (&w->prev, 0, sizeof (ev_statdata));
2299 memset (&w->attr, 0, sizeof (ev_statdata));
2300
2301 ev_stat_stat (EV_A_ w);
2302
2303 if (w->interval < MIN_STAT_INTERVAL)
2304 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2305
2306 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2307 ev_set_priority (&w->timer, ev_priority (w));
2308
2309 #if EV_USE_INOTIFY
2310 infy_init (EV_A);
2311
2312 if (fs_fd >= 0)
2313 infy_add (EV_A_ w);
2314 else
2315 #endif
2316 ev_timer_start (EV_A_ &w->timer);
2317
2318 ev_start (EV_A_ (W)w, 1);
2319 }
2320
2321 void
2322 ev_stat_stop (EV_P_ ev_stat *w)
2323 {
2324 clear_pending (EV_A_ (W)w);
2325 if (expect_false (!ev_is_active (w)))
2326 return;
2327
2328 #if EV_USE_INOTIFY
2329 infy_del (EV_A_ w);
2330 #endif
2331 ev_timer_stop (EV_A_ &w->timer);
2332
2333 ev_stop (EV_A_ (W)w);
2334 }
2335 #endif
2336
2337 #if EV_IDLE_ENABLE
2338 void
2339 ev_idle_start (EV_P_ ev_idle *w)
2340 {
2341 if (expect_false (ev_is_active (w)))
2342 return;
2343
2344 pri_adjust (EV_A_ (W)w);
2345
2346 {
2347 int active = ++idlecnt [ABSPRI (w)];
2348
2349 ++idleall;
2350 ev_start (EV_A_ (W)w, active);
2351
2352 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2353 idles [ABSPRI (w)][active - 1] = w;
2354 }
2355 }
2356
2357 void
2358 ev_idle_stop (EV_P_ ev_idle *w)
2359 {
2360 clear_pending (EV_A_ (W)w);
2361 if (expect_false (!ev_is_active (w)))
2362 return;
2363
2364 {
2365 int active = ((W)w)->active;
2366
2367 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2368 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2369
2370 ev_stop (EV_A_ (W)w);
2371 --idleall;
2372 }
2373 }
2374 #endif
2375
2376 void
2377 ev_prepare_start (EV_P_ ev_prepare *w)
2378 {
2379 if (expect_false (ev_is_active (w)))
2380 return;
2381
2382 ev_start (EV_A_ (W)w, ++preparecnt);
2383 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2384 prepares [preparecnt - 1] = w;
2385 }
2386
2387 void
2388 ev_prepare_stop (EV_P_ ev_prepare *w)
2389 {
2390 clear_pending (EV_A_ (W)w);
2391 if (expect_false (!ev_is_active (w)))
2392 return;
2393
2394 {
2395 int active = ((W)w)->active;
2396 prepares [active - 1] = prepares [--preparecnt];
2397 ((W)prepares [active - 1])->active = active;
2398 }
2399
2400 ev_stop (EV_A_ (W)w);
2401 }
2402
2403 void
2404 ev_check_start (EV_P_ ev_check *w)
2405 {
2406 if (expect_false (ev_is_active (w)))
2407 return;
2408
2409 ev_start (EV_A_ (W)w, ++checkcnt);
2410 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2411 checks [checkcnt - 1] = w;
2412 }
2413
2414 void
2415 ev_check_stop (EV_P_ ev_check *w)
2416 {
2417 clear_pending (EV_A_ (W)w);
2418 if (expect_false (!ev_is_active (w)))
2419 return;
2420
2421 {
2422 int active = ((W)w)->active;
2423 checks [active - 1] = checks [--checkcnt];
2424 ((W)checks [active - 1])->active = active;
2425 }
2426
2427 ev_stop (EV_A_ (W)w);
2428 }
2429
2430 #if EV_EMBED_ENABLE
2431 void noinline
2432 ev_embed_sweep (EV_P_ ev_embed *w)
2433 {
2434 ev_loop (w->other, EVLOOP_NONBLOCK);
2435 }
2436
2437 static void
2438 embed_io_cb (EV_P_ ev_io *io, int revents)
2439 {
2440 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2441
2442 if (ev_cb (w))
2443 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2444 else
2445 ev_loop (w->other, EVLOOP_NONBLOCK);
2446 }
2447
2448 static void
2449 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2450 {
2451 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2452
2453 {
2454 struct ev_loop *loop = w->other;
2455
2456 while (fdchangecnt)
2457 {
2458 fd_reify (EV_A);
2459 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2460 }
2461 }
2462 }
2463
2464 #if 0
2465 static void
2466 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2467 {
2468 ev_idle_stop (EV_A_ idle);
2469 }
2470 #endif
2471
2472 void
2473 ev_embed_start (EV_P_ ev_embed *w)
2474 {
2475 if (expect_false (ev_is_active (w)))
2476 return;
2477
2478 {
2479 struct ev_loop *loop = w->other;
2480 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2481 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2482 }
2483
2484 ev_set_priority (&w->io, ev_priority (w));
2485 ev_io_start (EV_A_ &w->io);
2486
2487 ev_prepare_init (&w->prepare, embed_prepare_cb);
2488 ev_set_priority (&w->prepare, EV_MINPRI);
2489 ev_prepare_start (EV_A_ &w->prepare);
2490
2491 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2492
2493 ev_start (EV_A_ (W)w, 1);
2494 }
2495
2496 void
2497 ev_embed_stop (EV_P_ ev_embed *w)
2498 {
2499 clear_pending (EV_A_ (W)w);
2500 if (expect_false (!ev_is_active (w)))
2501 return;
2502
2503 ev_io_stop (EV_A_ &w->io);
2504 ev_prepare_stop (EV_A_ &w->prepare);
2505
2506 ev_stop (EV_A_ (W)w);
2507 }
2508 #endif
2509
2510 #if EV_FORK_ENABLE
2511 void
2512 ev_fork_start (EV_P_ ev_fork *w)
2513 {
2514 if (expect_false (ev_is_active (w)))
2515 return;
2516
2517 ev_start (EV_A_ (W)w, ++forkcnt);
2518 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2519 forks [forkcnt - 1] = w;
2520 }
2521
2522 void
2523 ev_fork_stop (EV_P_ ev_fork *w)
2524 {
2525 clear_pending (EV_A_ (W)w);
2526 if (expect_false (!ev_is_active (w)))
2527 return;
2528
2529 {
2530 int active = ((W)w)->active;
2531 forks [active - 1] = forks [--forkcnt];
2532 ((W)forks [active - 1])->active = active;
2533 }
2534
2535 ev_stop (EV_A_ (W)w);
2536 }
2537 #endif
2538
2539 #if EV_ASYNC_ENABLE
2540 void
2541 ev_async_start (EV_P_ ev_async *w)
2542 {
2543 if (expect_false (ev_is_active (w)))
2544 return;
2545
2546 evpipe_init (EV_A);
2547
2548 ev_start (EV_A_ (W)w, ++asynccnt);
2549 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2550 asyncs [asynccnt - 1] = w;
2551 }
2552
2553 void
2554 ev_async_stop (EV_P_ ev_async *w)
2555 {
2556 clear_pending (EV_A_ (W)w);
2557 if (expect_false (!ev_is_active (w)))
2558 return;
2559
2560 {
2561 int active = ((W)w)->active;
2562 asyncs [active - 1] = asyncs [--asynccnt];
2563 ((W)asyncs [active - 1])->active = active;
2564 }
2565
2566 ev_stop (EV_A_ (W)w);
2567 }
2568
2569 void
2570 ev_async_send (EV_P_ ev_async *w)
2571 {
2572 w->sent = 1;
2573 evpipe_write (EV_A_ &gotasync);
2574 }
2575 #endif
2576
2577 /*****************************************************************************/
2578
2579 struct ev_once
2580 {
2581 ev_io io;
2582 ev_timer to;
2583 void (*cb)(int revents, void *arg);
2584 void *arg;
2585 };
2586
2587 static void
2588 once_cb (EV_P_ struct ev_once *once, int revents)
2589 {
2590 void (*cb)(int revents, void *arg) = once->cb;
2591 void *arg = once->arg;
2592
2593 ev_io_stop (EV_A_ &once->io);
2594 ev_timer_stop (EV_A_ &once->to);
2595 ev_free (once);
2596
2597 cb (revents, arg);
2598 }
2599
2600 static void
2601 once_cb_io (EV_P_ ev_io *w, int revents)
2602 {
2603 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2604 }
2605
2606 static void
2607 once_cb_to (EV_P_ ev_timer *w, int revents)
2608 {
2609 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2610 }
2611
2612 void
2613 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2614 {
2615 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2616
2617 if (expect_false (!once))
2618 {
2619 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2620 return;
2621 }
2622
2623 once->cb = cb;
2624 once->arg = arg;
2625
2626 ev_init (&once->io, once_cb_io);
2627 if (fd >= 0)
2628 {
2629 ev_io_set (&once->io, fd, events);
2630 ev_io_start (EV_A_ &once->io);
2631 }
2632
2633 ev_init (&once->to, once_cb_to);
2634 if (timeout >= 0.)
2635 {
2636 ev_timer_set (&once->to, timeout, 0.);
2637 ev_timer_start (EV_A_ &once->to);
2638 }
2639 }
2640
2641 #if EV_MULTIPLICITY
2642 #include "ev_wrap.h"
2643 #endif
2644
2645 #ifdef __cplusplus
2646 }
2647 #endif
2648