ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev.c
Revision: 1.228
Committed: Fri May 2 08:07:37 2008 UTC (16 years, 2 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.227: +56 -49 lines
Log Message:
*** empty log message ***

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 #define ev_at(w) ((WT)(w))->at
331
332 #if EV_USE_MONOTONIC
333 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
334 /* giving it a reasonably high chance of working on typical architetcures */
335 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
336 #endif
337
338 #ifdef _WIN32
339 # include "ev_win32.c"
340 #endif
341
342 /*****************************************************************************/
343
344 static void (*syserr_cb)(const char *msg);
345
346 void
347 ev_set_syserr_cb (void (*cb)(const char *msg))
348 {
349 syserr_cb = cb;
350 }
351
352 static void noinline
353 syserr (const char *msg)
354 {
355 if (!msg)
356 msg = "(libev) system error";
357
358 if (syserr_cb)
359 syserr_cb (msg);
360 else
361 {
362 perror (msg);
363 abort ();
364 }
365 }
366
367 static void *
368 ev_realloc_emul (void *ptr, long size)
369 {
370 /* some systems, notably openbsd and darwin, fail to properly
371 * implement realloc (x, 0) (as required by both ansi c-98 and
372 * the single unix specification, so work around them here.
373 */
374
375 if (size)
376 return realloc (ptr, size);
377
378 free (ptr);
379 return 0;
380 }
381
382 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
383
384 void
385 ev_set_allocator (void *(*cb)(void *ptr, long size))
386 {
387 alloc = cb;
388 }
389
390 inline_speed void *
391 ev_realloc (void *ptr, long size)
392 {
393 ptr = alloc (ptr, size);
394
395 if (!ptr && size)
396 {
397 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
398 abort ();
399 }
400
401 return ptr;
402 }
403
404 #define ev_malloc(size) ev_realloc (0, (size))
405 #define ev_free(ptr) ev_realloc ((ptr), 0)
406
407 /*****************************************************************************/
408
409 typedef struct
410 {
411 WL head;
412 unsigned char events;
413 unsigned char reify;
414 #if EV_SELECT_IS_WINSOCKET
415 SOCKET handle;
416 #endif
417 } ANFD;
418
419 typedef struct
420 {
421 W w;
422 int events;
423 } ANPENDING;
424
425 #if EV_USE_INOTIFY
426 typedef struct
427 {
428 WL head;
429 } ANFS;
430 #endif
431
432 #if EV_MULTIPLICITY
433
434 struct ev_loop
435 {
436 ev_tstamp ev_rt_now;
437 #define ev_rt_now ((loop)->ev_rt_now)
438 #define VAR(name,decl) decl;
439 #include "ev_vars.h"
440 #undef VAR
441 };
442 #include "ev_wrap.h"
443
444 static struct ev_loop default_loop_struct;
445 struct ev_loop *ev_default_loop_ptr;
446
447 #else
448
449 ev_tstamp ev_rt_now;
450 #define VAR(name,decl) static decl;
451 #include "ev_vars.h"
452 #undef VAR
453
454 static int ev_default_loop_ptr;
455
456 #endif
457
458 /*****************************************************************************/
459
460 ev_tstamp
461 ev_time (void)
462 {
463 #if EV_USE_REALTIME
464 struct timespec ts;
465 clock_gettime (CLOCK_REALTIME, &ts);
466 return ts.tv_sec + ts.tv_nsec * 1e-9;
467 #else
468 struct timeval tv;
469 gettimeofday (&tv, 0);
470 return tv.tv_sec + tv.tv_usec * 1e-6;
471 #endif
472 }
473
474 ev_tstamp inline_size
475 get_clock (void)
476 {
477 #if EV_USE_MONOTONIC
478 if (expect_true (have_monotonic))
479 {
480 struct timespec ts;
481 clock_gettime (CLOCK_MONOTONIC, &ts);
482 return ts.tv_sec + ts.tv_nsec * 1e-9;
483 }
484 #endif
485
486 return ev_time ();
487 }
488
489 #if EV_MULTIPLICITY
490 ev_tstamp
491 ev_now (EV_P)
492 {
493 return ev_rt_now;
494 }
495 #endif
496
497 void
498 ev_sleep (ev_tstamp delay)
499 {
500 if (delay > 0.)
501 {
502 #if EV_USE_NANOSLEEP
503 struct timespec ts;
504
505 ts.tv_sec = (time_t)delay;
506 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
507
508 nanosleep (&ts, 0);
509 #elif defined(_WIN32)
510 Sleep ((unsigned long)(delay * 1e3));
511 #else
512 struct timeval tv;
513
514 tv.tv_sec = (time_t)delay;
515 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
516
517 select (0, 0, 0, 0, &tv);
518 #endif
519 }
520 }
521
522 /*****************************************************************************/
523
524 int inline_size
525 array_nextsize (int elem, int cur, int cnt)
526 {
527 int ncur = cur + 1;
528
529 do
530 ncur <<= 1;
531 while (cnt > ncur);
532
533 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
534 if (elem * ncur > 4096)
535 {
536 ncur *= elem;
537 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
538 ncur = ncur - sizeof (void *) * 4;
539 ncur /= elem;
540 }
541
542 return ncur;
543 }
544
545 static noinline void *
546 array_realloc (int elem, void *base, int *cur, int cnt)
547 {
548 *cur = array_nextsize (elem, *cur, cnt);
549 return ev_realloc (base, elem * *cur);
550 }
551
552 #define array_needsize(type,base,cur,cnt,init) \
553 if (expect_false ((cnt) > (cur))) \
554 { \
555 int ocur_ = (cur); \
556 (base) = (type *)array_realloc \
557 (sizeof (type), (base), &(cur), (cnt)); \
558 init ((base) + (ocur_), (cur) - ocur_); \
559 }
560
561 #if 0
562 #define array_slim(type,stem) \
563 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
564 { \
565 stem ## max = array_roundsize (stem ## cnt >> 1); \
566 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
567 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
568 }
569 #endif
570
571 #define array_free(stem, idx) \
572 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
573
574 /*****************************************************************************/
575
576 void noinline
577 ev_feed_event (EV_P_ void *w, int revents)
578 {
579 W w_ = (W)w;
580 int pri = ABSPRI (w_);
581
582 if (expect_false (w_->pending))
583 pendings [pri][w_->pending - 1].events |= revents;
584 else
585 {
586 w_->pending = ++pendingcnt [pri];
587 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
588 pendings [pri][w_->pending - 1].w = w_;
589 pendings [pri][w_->pending - 1].events = revents;
590 }
591 }
592
593 void inline_speed
594 queue_events (EV_P_ W *events, int eventcnt, int type)
595 {
596 int i;
597
598 for (i = 0; i < eventcnt; ++i)
599 ev_feed_event (EV_A_ events [i], type);
600 }
601
602 /*****************************************************************************/
603
604 void inline_size
605 anfds_init (ANFD *base, int count)
606 {
607 while (count--)
608 {
609 base->head = 0;
610 base->events = EV_NONE;
611 base->reify = 0;
612
613 ++base;
614 }
615 }
616
617 void inline_speed
618 fd_event (EV_P_ int fd, int revents)
619 {
620 ANFD *anfd = anfds + fd;
621 ev_io *w;
622
623 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
624 {
625 int ev = w->events & revents;
626
627 if (ev)
628 ev_feed_event (EV_A_ (W)w, ev);
629 }
630 }
631
632 void
633 ev_feed_fd_event (EV_P_ int fd, int revents)
634 {
635 if (fd >= 0 && fd < anfdmax)
636 fd_event (EV_A_ fd, revents);
637 }
638
639 void inline_size
640 fd_reify (EV_P)
641 {
642 int i;
643
644 for (i = 0; i < fdchangecnt; ++i)
645 {
646 int fd = fdchanges [i];
647 ANFD *anfd = anfds + fd;
648 ev_io *w;
649
650 unsigned char events = 0;
651
652 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
653 events |= (unsigned char)w->events;
654
655 #if EV_SELECT_IS_WINSOCKET
656 if (events)
657 {
658 unsigned long argp;
659 #ifdef EV_FD_TO_WIN32_HANDLE
660 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
661 #else
662 anfd->handle = _get_osfhandle (fd);
663 #endif
664 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
665 }
666 #endif
667
668 {
669 unsigned char o_events = anfd->events;
670 unsigned char o_reify = anfd->reify;
671
672 anfd->reify = 0;
673 anfd->events = events;
674
675 if (o_events != events || o_reify & EV_IOFDSET)
676 backend_modify (EV_A_ fd, o_events, events);
677 }
678 }
679
680 fdchangecnt = 0;
681 }
682
683 void inline_size
684 fd_change (EV_P_ int fd, int flags)
685 {
686 unsigned char reify = anfds [fd].reify;
687 anfds [fd].reify |= flags;
688
689 if (expect_true (!reify))
690 {
691 ++fdchangecnt;
692 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
693 fdchanges [fdchangecnt - 1] = fd;
694 }
695 }
696
697 void inline_speed
698 fd_kill (EV_P_ int fd)
699 {
700 ev_io *w;
701
702 while ((w = (ev_io *)anfds [fd].head))
703 {
704 ev_io_stop (EV_A_ w);
705 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
706 }
707 }
708
709 int inline_size
710 fd_valid (int fd)
711 {
712 #ifdef _WIN32
713 return _get_osfhandle (fd) != -1;
714 #else
715 return fcntl (fd, F_GETFD) != -1;
716 #endif
717 }
718
719 /* called on EBADF to verify fds */
720 static void noinline
721 fd_ebadf (EV_P)
722 {
723 int fd;
724
725 for (fd = 0; fd < anfdmax; ++fd)
726 if (anfds [fd].events)
727 if (!fd_valid (fd) == -1 && errno == EBADF)
728 fd_kill (EV_A_ fd);
729 }
730
731 /* called on ENOMEM in select/poll to kill some fds and retry */
732 static void noinline
733 fd_enomem (EV_P)
734 {
735 int fd;
736
737 for (fd = anfdmax; fd--; )
738 if (anfds [fd].events)
739 {
740 fd_kill (EV_A_ fd);
741 return;
742 }
743 }
744
745 /* usually called after fork if backend needs to re-arm all fds from scratch */
746 static void noinline
747 fd_rearm_all (EV_P)
748 {
749 int fd;
750
751 for (fd = 0; fd < anfdmax; ++fd)
752 if (anfds [fd].events)
753 {
754 anfds [fd].events = 0;
755 fd_change (EV_A_ fd, EV_IOFDSET | 1);
756 }
757 }
758
759 /*****************************************************************************/
760
761 /* towards the root */
762 void inline_speed
763 upheap (WT *heap, int k)
764 {
765 WT w = heap [k];
766
767 for (;;)
768 {
769 int p = k >> 1;
770
771 /* maybe we could use a dummy element at heap [0]? */
772 if (!p || heap [p]->at <= w->at)
773 break;
774
775 heap [k] = heap [p];
776 ((W)heap [k])->active = k;
777 k = p;
778 }
779
780 heap [k] = w;
781 ((W)heap [k])->active = k;
782 }
783
784 /* away from the root */
785 void inline_speed
786 downheap (WT *heap, int N, int k)
787 {
788 WT w = heap [k];
789
790 for (;;)
791 {
792 int c = k << 1;
793
794 if (c > N)
795 break;
796
797 c += c < N && heap [c]->at > heap [c + 1]->at
798 ? 1 : 0;
799
800 if (w->at <= heap [c]->at)
801 break;
802
803 heap [k] = heap [c];
804 ((W)heap [k])->active = k;
805
806 k = c;
807 }
808
809 heap [k] = w;
810 ((W)heap [k])->active = k;
811 }
812
813 void inline_size
814 adjustheap (WT *heap, int N, int k)
815 {
816 upheap (heap, k);
817 downheap (heap, N, k);
818 }
819
820 /*****************************************************************************/
821
822 typedef struct
823 {
824 WL head;
825 EV_ATOMIC_T gotsig;
826 } ANSIG;
827
828 static ANSIG *signals;
829 static int signalmax;
830
831 static EV_ATOMIC_T gotsig;
832
833 void inline_size
834 signals_init (ANSIG *base, int count)
835 {
836 while (count--)
837 {
838 base->head = 0;
839 base->gotsig = 0;
840
841 ++base;
842 }
843 }
844
845 /*****************************************************************************/
846
847 void inline_speed
848 fd_intern (int fd)
849 {
850 #ifdef _WIN32
851 int arg = 1;
852 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
853 #else
854 fcntl (fd, F_SETFD, FD_CLOEXEC);
855 fcntl (fd, F_SETFL, O_NONBLOCK);
856 #endif
857 }
858
859 static void noinline
860 evpipe_init (EV_P)
861 {
862 if (!ev_is_active (&pipeev))
863 {
864 #if EV_USE_EVENTFD
865 if ((evfd = eventfd (0, 0)) >= 0)
866 {
867 evpipe [0] = -1;
868 fd_intern (evfd);
869 ev_io_set (&pipeev, evfd, EV_READ);
870 }
871 else
872 #endif
873 {
874 while (pipe (evpipe))
875 syserr ("(libev) error creating signal/async pipe");
876
877 fd_intern (evpipe [0]);
878 fd_intern (evpipe [1]);
879 ev_io_set (&pipeev, evpipe [0], EV_READ);
880 }
881
882 ev_io_start (EV_A_ &pipeev);
883 ev_unref (EV_A); /* watcher should not keep loop alive */
884 }
885 }
886
887 void inline_size
888 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
889 {
890 if (!*flag)
891 {
892 int old_errno = errno; /* save errno because write might clobber it */
893
894 *flag = 1;
895
896 #if EV_USE_EVENTFD
897 if (evfd >= 0)
898 {
899 uint64_t counter = 1;
900 write (evfd, &counter, sizeof (uint64_t));
901 }
902 else
903 #endif
904 write (evpipe [1], &old_errno, 1);
905
906 errno = old_errno;
907 }
908 }
909
910 static void
911 pipecb (EV_P_ ev_io *iow, int revents)
912 {
913 #if EV_USE_EVENTFD
914 if (evfd >= 0)
915 {
916 uint64_t counter = 1;
917 read (evfd, &counter, sizeof (uint64_t));
918 }
919 else
920 #endif
921 {
922 char dummy;
923 read (evpipe [0], &dummy, 1);
924 }
925
926 if (gotsig && ev_is_default_loop (EV_A))
927 {
928 int signum;
929 gotsig = 0;
930
931 for (signum = signalmax; signum--; )
932 if (signals [signum].gotsig)
933 ev_feed_signal_event (EV_A_ signum + 1);
934 }
935
936 #if EV_ASYNC_ENABLE
937 if (gotasync)
938 {
939 int i;
940 gotasync = 0;
941
942 for (i = asynccnt; i--; )
943 if (asyncs [i]->sent)
944 {
945 asyncs [i]->sent = 0;
946 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
947 }
948 }
949 #endif
950 }
951
952 /*****************************************************************************/
953
954 static void
955 ev_sighandler (int signum)
956 {
957 #if EV_MULTIPLICITY
958 struct ev_loop *loop = &default_loop_struct;
959 #endif
960
961 #if _WIN32
962 signal (signum, ev_sighandler);
963 #endif
964
965 signals [signum - 1].gotsig = 1;
966 evpipe_write (EV_A_ &gotsig);
967 }
968
969 void noinline
970 ev_feed_signal_event (EV_P_ int signum)
971 {
972 WL w;
973
974 #if EV_MULTIPLICITY
975 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
976 #endif
977
978 --signum;
979
980 if (signum < 0 || signum >= signalmax)
981 return;
982
983 signals [signum].gotsig = 0;
984
985 for (w = signals [signum].head; w; w = w->next)
986 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
987 }
988
989 /*****************************************************************************/
990
991 static WL childs [EV_PID_HASHSIZE];
992
993 #ifndef _WIN32
994
995 static ev_signal childev;
996
997 #ifndef WIFCONTINUED
998 # define WIFCONTINUED(status) 0
999 #endif
1000
1001 void inline_speed
1002 child_reap (EV_P_ int chain, int pid, int status)
1003 {
1004 ev_child *w;
1005 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1006
1007 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1008 {
1009 if ((w->pid == pid || !w->pid)
1010 && (!traced || (w->flags & 1)))
1011 {
1012 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1013 w->rpid = pid;
1014 w->rstatus = status;
1015 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1016 }
1017 }
1018 }
1019
1020 #ifndef WCONTINUED
1021 # define WCONTINUED 0
1022 #endif
1023
1024 static void
1025 childcb (EV_P_ ev_signal *sw, int revents)
1026 {
1027 int pid, status;
1028
1029 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1030 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1031 if (!WCONTINUED
1032 || errno != EINVAL
1033 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1034 return;
1035
1036 /* make sure we are called again until all children have been reaped */
1037 /* we need to do it this way so that the callback gets called before we continue */
1038 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1039
1040 child_reap (EV_A_ pid, pid, status);
1041 if (EV_PID_HASHSIZE > 1)
1042 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1043 }
1044
1045 #endif
1046
1047 /*****************************************************************************/
1048
1049 #if EV_USE_PORT
1050 # include "ev_port.c"
1051 #endif
1052 #if EV_USE_KQUEUE
1053 # include "ev_kqueue.c"
1054 #endif
1055 #if EV_USE_EPOLL
1056 # include "ev_epoll.c"
1057 #endif
1058 #if EV_USE_POLL
1059 # include "ev_poll.c"
1060 #endif
1061 #if EV_USE_SELECT
1062 # include "ev_select.c"
1063 #endif
1064
1065 int
1066 ev_version_major (void)
1067 {
1068 return EV_VERSION_MAJOR;
1069 }
1070
1071 int
1072 ev_version_minor (void)
1073 {
1074 return EV_VERSION_MINOR;
1075 }
1076
1077 /* return true if we are running with elevated privileges and should ignore env variables */
1078 int inline_size
1079 enable_secure (void)
1080 {
1081 #ifdef _WIN32
1082 return 0;
1083 #else
1084 return getuid () != geteuid ()
1085 || getgid () != getegid ();
1086 #endif
1087 }
1088
1089 unsigned int
1090 ev_supported_backends (void)
1091 {
1092 unsigned int flags = 0;
1093
1094 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1095 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1096 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1097 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1098 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1099
1100 return flags;
1101 }
1102
1103 unsigned int
1104 ev_recommended_backends (void)
1105 {
1106 unsigned int flags = ev_supported_backends ();
1107
1108 #ifndef __NetBSD__
1109 /* kqueue is borked on everything but netbsd apparently */
1110 /* it usually doesn't work correctly on anything but sockets and pipes */
1111 flags &= ~EVBACKEND_KQUEUE;
1112 #endif
1113 #ifdef __APPLE__
1114 // flags &= ~EVBACKEND_KQUEUE; for documentation
1115 flags &= ~EVBACKEND_POLL;
1116 #endif
1117
1118 return flags;
1119 }
1120
1121 unsigned int
1122 ev_embeddable_backends (void)
1123 {
1124 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1125
1126 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1127 /* please fix it and tell me how to detect the fix */
1128 flags &= ~EVBACKEND_EPOLL;
1129
1130 return flags;
1131 }
1132
1133 unsigned int
1134 ev_backend (EV_P)
1135 {
1136 return backend;
1137 }
1138
1139 unsigned int
1140 ev_loop_count (EV_P)
1141 {
1142 return loop_count;
1143 }
1144
1145 void
1146 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1147 {
1148 io_blocktime = interval;
1149 }
1150
1151 void
1152 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1153 {
1154 timeout_blocktime = interval;
1155 }
1156
1157 static void noinline
1158 loop_init (EV_P_ unsigned int flags)
1159 {
1160 if (!backend)
1161 {
1162 #if EV_USE_MONOTONIC
1163 {
1164 struct timespec ts;
1165 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1166 have_monotonic = 1;
1167 }
1168 #endif
1169
1170 ev_rt_now = ev_time ();
1171 mn_now = get_clock ();
1172 now_floor = mn_now;
1173 rtmn_diff = ev_rt_now - mn_now;
1174
1175 io_blocktime = 0.;
1176 timeout_blocktime = 0.;
1177 backend = 0;
1178 backend_fd = -1;
1179 gotasync = 0;
1180 #if EV_USE_INOTIFY
1181 fs_fd = -2;
1182 #endif
1183
1184 /* pid check not overridable via env */
1185 #ifndef _WIN32
1186 if (flags & EVFLAG_FORKCHECK)
1187 curpid = getpid ();
1188 #endif
1189
1190 if (!(flags & EVFLAG_NOENV)
1191 && !enable_secure ()
1192 && getenv ("LIBEV_FLAGS"))
1193 flags = atoi (getenv ("LIBEV_FLAGS"));
1194
1195 if (!(flags & 0x0000ffffU))
1196 flags |= ev_recommended_backends ();
1197
1198 #if EV_USE_PORT
1199 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1200 #endif
1201 #if EV_USE_KQUEUE
1202 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1203 #endif
1204 #if EV_USE_EPOLL
1205 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1206 #endif
1207 #if EV_USE_POLL
1208 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1209 #endif
1210 #if EV_USE_SELECT
1211 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1212 #endif
1213
1214 ev_init (&pipeev, pipecb);
1215 ev_set_priority (&pipeev, EV_MAXPRI);
1216 }
1217 }
1218
1219 static void noinline
1220 loop_destroy (EV_P)
1221 {
1222 int i;
1223
1224 if (ev_is_active (&pipeev))
1225 {
1226 ev_ref (EV_A); /* signal watcher */
1227 ev_io_stop (EV_A_ &pipeev);
1228
1229 #if EV_USE_EVENTFD
1230 if (evfd >= 0)
1231 close (evfd);
1232 #endif
1233
1234 if (evpipe [0] >= 0)
1235 {
1236 close (evpipe [0]);
1237 close (evpipe [1]);
1238 }
1239 }
1240
1241 #if EV_USE_INOTIFY
1242 if (fs_fd >= 0)
1243 close (fs_fd);
1244 #endif
1245
1246 if (backend_fd >= 0)
1247 close (backend_fd);
1248
1249 #if EV_USE_PORT
1250 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1251 #endif
1252 #if EV_USE_KQUEUE
1253 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1254 #endif
1255 #if EV_USE_EPOLL
1256 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1257 #endif
1258 #if EV_USE_POLL
1259 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1260 #endif
1261 #if EV_USE_SELECT
1262 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1263 #endif
1264
1265 for (i = NUMPRI; i--; )
1266 {
1267 array_free (pending, [i]);
1268 #if EV_IDLE_ENABLE
1269 array_free (idle, [i]);
1270 #endif
1271 }
1272
1273 ev_free (anfds); anfdmax = 0;
1274
1275 /* have to use the microsoft-never-gets-it-right macro */
1276 array_free (fdchange, EMPTY);
1277 array_free (timer, EMPTY);
1278 #if EV_PERIODIC_ENABLE
1279 array_free (periodic, EMPTY);
1280 #endif
1281 #if EV_FORK_ENABLE
1282 array_free (fork, EMPTY);
1283 #endif
1284 array_free (prepare, EMPTY);
1285 array_free (check, EMPTY);
1286 #if EV_ASYNC_ENABLE
1287 array_free (async, EMPTY);
1288 #endif
1289
1290 backend = 0;
1291 }
1292
1293 #if EV_USE_INOTIFY
1294 void inline_size infy_fork (EV_P);
1295 #endif
1296
1297 void inline_size
1298 loop_fork (EV_P)
1299 {
1300 #if EV_USE_PORT
1301 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1302 #endif
1303 #if EV_USE_KQUEUE
1304 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1305 #endif
1306 #if EV_USE_EPOLL
1307 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1308 #endif
1309 #if EV_USE_INOTIFY
1310 infy_fork (EV_A);
1311 #endif
1312
1313 if (ev_is_active (&pipeev))
1314 {
1315 /* this "locks" the handlers against writing to the pipe */
1316 /* while we modify the fd vars */
1317 gotsig = 1;
1318 #if EV_ASYNC_ENABLE
1319 gotasync = 1;
1320 #endif
1321
1322 ev_ref (EV_A);
1323 ev_io_stop (EV_A_ &pipeev);
1324
1325 #if EV_USE_EVENTFD
1326 if (evfd >= 0)
1327 close (evfd);
1328 #endif
1329
1330 if (evpipe [0] >= 0)
1331 {
1332 close (evpipe [0]);
1333 close (evpipe [1]);
1334 }
1335
1336 evpipe_init (EV_A);
1337 /* now iterate over everything, in case we missed something */
1338 pipecb (EV_A_ &pipeev, EV_READ);
1339 }
1340
1341 postfork = 0;
1342 }
1343
1344 #if EV_MULTIPLICITY
1345 struct ev_loop *
1346 ev_loop_new (unsigned int flags)
1347 {
1348 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1349
1350 memset (loop, 0, sizeof (struct ev_loop));
1351
1352 loop_init (EV_A_ flags);
1353
1354 if (ev_backend (EV_A))
1355 return loop;
1356
1357 return 0;
1358 }
1359
1360 void
1361 ev_loop_destroy (EV_P)
1362 {
1363 loop_destroy (EV_A);
1364 ev_free (loop);
1365 }
1366
1367 void
1368 ev_loop_fork (EV_P)
1369 {
1370 postfork = 1; /* must be in line with ev_default_fork */
1371 }
1372
1373 #endif
1374
1375 #if EV_MULTIPLICITY
1376 struct ev_loop *
1377 ev_default_loop_init (unsigned int flags)
1378 #else
1379 int
1380 ev_default_loop (unsigned int flags)
1381 #endif
1382 {
1383 if (!ev_default_loop_ptr)
1384 {
1385 #if EV_MULTIPLICITY
1386 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1387 #else
1388 ev_default_loop_ptr = 1;
1389 #endif
1390
1391 loop_init (EV_A_ flags);
1392
1393 if (ev_backend (EV_A))
1394 {
1395 #ifndef _WIN32
1396 ev_signal_init (&childev, childcb, SIGCHLD);
1397 ev_set_priority (&childev, EV_MAXPRI);
1398 ev_signal_start (EV_A_ &childev);
1399 ev_unref (EV_A); /* child watcher should not keep loop alive */
1400 #endif
1401 }
1402 else
1403 ev_default_loop_ptr = 0;
1404 }
1405
1406 return ev_default_loop_ptr;
1407 }
1408
1409 void
1410 ev_default_destroy (void)
1411 {
1412 #if EV_MULTIPLICITY
1413 struct ev_loop *loop = ev_default_loop_ptr;
1414 #endif
1415
1416 #ifndef _WIN32
1417 ev_ref (EV_A); /* child watcher */
1418 ev_signal_stop (EV_A_ &childev);
1419 #endif
1420
1421 loop_destroy (EV_A);
1422 }
1423
1424 void
1425 ev_default_fork (void)
1426 {
1427 #if EV_MULTIPLICITY
1428 struct ev_loop *loop = ev_default_loop_ptr;
1429 #endif
1430
1431 if (backend)
1432 postfork = 1; /* must be in line with ev_loop_fork */
1433 }
1434
1435 /*****************************************************************************/
1436
1437 void
1438 ev_invoke (EV_P_ void *w, int revents)
1439 {
1440 EV_CB_INVOKE ((W)w, revents);
1441 }
1442
1443 void inline_speed
1444 call_pending (EV_P)
1445 {
1446 int pri;
1447
1448 for (pri = NUMPRI; pri--; )
1449 while (pendingcnt [pri])
1450 {
1451 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1452
1453 if (expect_true (p->w))
1454 {
1455 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1456
1457 p->w->pending = 0;
1458 EV_CB_INVOKE (p->w, p->events);
1459 }
1460 }
1461 }
1462
1463 void inline_size
1464 timers_reify (EV_P)
1465 {
1466 while (timercnt && ev_at (timers [1]) <= mn_now)
1467 {
1468 ev_timer *w = (ev_timer *)timers [1];
1469
1470 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1471
1472 /* first reschedule or stop timer */
1473 if (w->repeat)
1474 {
1475 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1476
1477 ev_at (w) += w->repeat;
1478 if (ev_at (w) < mn_now)
1479 ev_at (w) = mn_now;
1480
1481 downheap (timers, timercnt, 1);
1482 }
1483 else
1484 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1485
1486 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1487 }
1488 }
1489
1490 #if EV_PERIODIC_ENABLE
1491 void inline_size
1492 periodics_reify (EV_P)
1493 {
1494 while (periodiccnt && ev_at (periodics [1]) <= ev_rt_now)
1495 {
1496 ev_periodic *w = (ev_periodic *)periodics [1];
1497
1498 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1499
1500 /* first reschedule or stop timer */
1501 if (w->reschedule_cb)
1502 {
1503 ev_at (w) = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1504 assert (("ev_periodic reschedule callback returned time in the past", ev_at (w) > ev_rt_now));
1505 downheap (periodics, periodiccnt, 1);
1506 }
1507 else if (w->interval)
1508 {
1509 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1510 if (ev_at (w) - ev_rt_now <= TIME_EPSILON) ev_at (w) += w->interval;
1511 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ev_at (w) > ev_rt_now));
1512 downheap (periodics, periodiccnt, 1);
1513 }
1514 else
1515 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1516
1517 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1518 }
1519 }
1520
1521 static void noinline
1522 periodics_reschedule (EV_P)
1523 {
1524 int i;
1525
1526 /* adjust periodics after time jump */
1527 for (i = 0; i < periodiccnt; ++i)
1528 {
1529 ev_periodic *w = (ev_periodic *)periodics [i];
1530
1531 if (w->reschedule_cb)
1532 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1533 else if (w->interval)
1534 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1535 }
1536
1537 /* now rebuild the heap */
1538 for (i = periodiccnt >> 1; i--; )
1539 downheap (periodics, periodiccnt, i);
1540 }
1541 #endif
1542
1543 #if EV_IDLE_ENABLE
1544 void inline_size
1545 idle_reify (EV_P)
1546 {
1547 if (expect_false (idleall))
1548 {
1549 int pri;
1550
1551 for (pri = NUMPRI; pri--; )
1552 {
1553 if (pendingcnt [pri])
1554 break;
1555
1556 if (idlecnt [pri])
1557 {
1558 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1559 break;
1560 }
1561 }
1562 }
1563 }
1564 #endif
1565
1566 void inline_speed
1567 time_update (EV_P_ ev_tstamp max_block)
1568 {
1569 int i;
1570
1571 #if EV_USE_MONOTONIC
1572 if (expect_true (have_monotonic))
1573 {
1574 ev_tstamp odiff = rtmn_diff;
1575
1576 mn_now = get_clock ();
1577
1578 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1579 /* interpolate in the meantime */
1580 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1581 {
1582 ev_rt_now = rtmn_diff + mn_now;
1583 return;
1584 }
1585
1586 now_floor = mn_now;
1587 ev_rt_now = ev_time ();
1588
1589 /* loop a few times, before making important decisions.
1590 * on the choice of "4": one iteration isn't enough,
1591 * in case we get preempted during the calls to
1592 * ev_time and get_clock. a second call is almost guaranteed
1593 * to succeed in that case, though. and looping a few more times
1594 * doesn't hurt either as we only do this on time-jumps or
1595 * in the unlikely event of having been preempted here.
1596 */
1597 for (i = 4; --i; )
1598 {
1599 rtmn_diff = ev_rt_now - mn_now;
1600
1601 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1602 return; /* all is well */
1603
1604 ev_rt_now = ev_time ();
1605 mn_now = get_clock ();
1606 now_floor = mn_now;
1607 }
1608
1609 # if EV_PERIODIC_ENABLE
1610 periodics_reschedule (EV_A);
1611 # endif
1612 /* no timer adjustment, as the monotonic clock doesn't jump */
1613 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1614 }
1615 else
1616 #endif
1617 {
1618 ev_rt_now = ev_time ();
1619
1620 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1621 {
1622 #if EV_PERIODIC_ENABLE
1623 periodics_reschedule (EV_A);
1624 #endif
1625 /* adjust timers. this is easy, as the offset is the same for all of them */
1626 for (i = 1; i <= timercnt; ++i)
1627 ev_at (timers [i]) += ev_rt_now - mn_now;
1628 }
1629
1630 mn_now = ev_rt_now;
1631 }
1632 }
1633
1634 void
1635 ev_ref (EV_P)
1636 {
1637 ++activecnt;
1638 }
1639
1640 void
1641 ev_unref (EV_P)
1642 {
1643 --activecnt;
1644 }
1645
1646 static int loop_done;
1647
1648 void
1649 ev_loop (EV_P_ int flags)
1650 {
1651 loop_done = EVUNLOOP_CANCEL;
1652
1653 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1654
1655 do
1656 {
1657 #ifndef _WIN32
1658 if (expect_false (curpid)) /* penalise the forking check even more */
1659 if (expect_false (getpid () != curpid))
1660 {
1661 curpid = getpid ();
1662 postfork = 1;
1663 }
1664 #endif
1665
1666 #if EV_FORK_ENABLE
1667 /* we might have forked, so queue fork handlers */
1668 if (expect_false (postfork))
1669 if (forkcnt)
1670 {
1671 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1672 call_pending (EV_A);
1673 }
1674 #endif
1675
1676 /* queue prepare watchers (and execute them) */
1677 if (expect_false (preparecnt))
1678 {
1679 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1680 call_pending (EV_A);
1681 }
1682
1683 if (expect_false (!activecnt))
1684 break;
1685
1686 /* we might have forked, so reify kernel state if necessary */
1687 if (expect_false (postfork))
1688 loop_fork (EV_A);
1689
1690 /* update fd-related kernel structures */
1691 fd_reify (EV_A);
1692
1693 /* calculate blocking time */
1694 {
1695 ev_tstamp waittime = 0.;
1696 ev_tstamp sleeptime = 0.;
1697
1698 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1699 {
1700 /* update time to cancel out callback processing overhead */
1701 time_update (EV_A_ 1e100);
1702
1703 waittime = MAX_BLOCKTIME;
1704
1705 if (timercnt)
1706 {
1707 ev_tstamp to = ev_at (timers [1]) - mn_now + backend_fudge;
1708 if (waittime > to) waittime = to;
1709 }
1710
1711 #if EV_PERIODIC_ENABLE
1712 if (periodiccnt)
1713 {
1714 ev_tstamp to = ev_at (periodics [1]) - ev_rt_now + backend_fudge;
1715 if (waittime > to) waittime = to;
1716 }
1717 #endif
1718
1719 if (expect_false (waittime < timeout_blocktime))
1720 waittime = timeout_blocktime;
1721
1722 sleeptime = waittime - backend_fudge;
1723
1724 if (expect_true (sleeptime > io_blocktime))
1725 sleeptime = io_blocktime;
1726
1727 if (sleeptime)
1728 {
1729 ev_sleep (sleeptime);
1730 waittime -= sleeptime;
1731 }
1732 }
1733
1734 ++loop_count;
1735 backend_poll (EV_A_ waittime);
1736
1737 /* update ev_rt_now, do magic */
1738 time_update (EV_A_ waittime + sleeptime);
1739 }
1740
1741 /* queue pending timers and reschedule them */
1742 timers_reify (EV_A); /* relative timers called last */
1743 #if EV_PERIODIC_ENABLE
1744 periodics_reify (EV_A); /* absolute timers called first */
1745 #endif
1746
1747 #if EV_IDLE_ENABLE
1748 /* queue idle watchers unless other events are pending */
1749 idle_reify (EV_A);
1750 #endif
1751
1752 /* queue check watchers, to be executed first */
1753 if (expect_false (checkcnt))
1754 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1755
1756 call_pending (EV_A);
1757 }
1758 while (expect_true (
1759 activecnt
1760 && !loop_done
1761 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
1762 ));
1763
1764 if (loop_done == EVUNLOOP_ONE)
1765 loop_done = EVUNLOOP_CANCEL;
1766 }
1767
1768 void
1769 ev_unloop (EV_P_ int how)
1770 {
1771 loop_done = how;
1772 }
1773
1774 /*****************************************************************************/
1775
1776 void inline_size
1777 wlist_add (WL *head, WL elem)
1778 {
1779 elem->next = *head;
1780 *head = elem;
1781 }
1782
1783 void inline_size
1784 wlist_del (WL *head, WL elem)
1785 {
1786 while (*head)
1787 {
1788 if (*head == elem)
1789 {
1790 *head = elem->next;
1791 return;
1792 }
1793
1794 head = &(*head)->next;
1795 }
1796 }
1797
1798 void inline_speed
1799 clear_pending (EV_P_ W w)
1800 {
1801 if (w->pending)
1802 {
1803 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1804 w->pending = 0;
1805 }
1806 }
1807
1808 int
1809 ev_clear_pending (EV_P_ void *w)
1810 {
1811 W w_ = (W)w;
1812 int pending = w_->pending;
1813
1814 if (expect_true (pending))
1815 {
1816 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1817 w_->pending = 0;
1818 p->w = 0;
1819 return p->events;
1820 }
1821 else
1822 return 0;
1823 }
1824
1825 void inline_size
1826 pri_adjust (EV_P_ W w)
1827 {
1828 int pri = w->priority;
1829 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1830 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1831 w->priority = pri;
1832 }
1833
1834 void inline_speed
1835 ev_start (EV_P_ W w, int active)
1836 {
1837 pri_adjust (EV_A_ w);
1838 w->active = active;
1839 ev_ref (EV_A);
1840 }
1841
1842 void inline_size
1843 ev_stop (EV_P_ W w)
1844 {
1845 ev_unref (EV_A);
1846 w->active = 0;
1847 }
1848
1849 /*****************************************************************************/
1850
1851 void noinline
1852 ev_io_start (EV_P_ ev_io *w)
1853 {
1854 int fd = w->fd;
1855
1856 if (expect_false (ev_is_active (w)))
1857 return;
1858
1859 assert (("ev_io_start called with negative fd", fd >= 0));
1860
1861 ev_start (EV_A_ (W)w, 1);
1862 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1863 wlist_add (&anfds[fd].head, (WL)w);
1864
1865 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1866 w->events &= ~EV_IOFDSET;
1867 }
1868
1869 void noinline
1870 ev_io_stop (EV_P_ ev_io *w)
1871 {
1872 clear_pending (EV_A_ (W)w);
1873 if (expect_false (!ev_is_active (w)))
1874 return;
1875
1876 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1877
1878 wlist_del (&anfds[w->fd].head, (WL)w);
1879 ev_stop (EV_A_ (W)w);
1880
1881 fd_change (EV_A_ w->fd, 1);
1882 }
1883
1884 void noinline
1885 ev_timer_start (EV_P_ ev_timer *w)
1886 {
1887 if (expect_false (ev_is_active (w)))
1888 return;
1889
1890 ev_at (w) += mn_now;
1891
1892 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1893
1894 ev_start (EV_A_ (W)w, ++timercnt);
1895 array_needsize (WT, timers, timermax, timercnt + 1, EMPTY2);
1896 timers [timercnt] = (WT)w;
1897 upheap (timers, timercnt);
1898
1899 /*assert (("internal timer heap corruption", timers [((W)w)->active] == w));*/
1900 }
1901
1902 void noinline
1903 ev_timer_stop (EV_P_ ev_timer *w)
1904 {
1905 clear_pending (EV_A_ (W)w);
1906 if (expect_false (!ev_is_active (w)))
1907 return;
1908
1909 assert (("internal timer heap corruption", timers [((W)w)->active] == (WT)w));
1910
1911 {
1912 int active = ((W)w)->active;
1913
1914 if (expect_true (active < timercnt))
1915 {
1916 timers [active] = timers [timercnt];
1917 adjustheap (timers, timercnt, active);
1918 }
1919
1920 --timercnt;
1921 }
1922
1923 ev_at (w) -= mn_now;
1924
1925 ev_stop (EV_A_ (W)w);
1926 }
1927
1928 void noinline
1929 ev_timer_again (EV_P_ ev_timer *w)
1930 {
1931 if (ev_is_active (w))
1932 {
1933 if (w->repeat)
1934 {
1935 ev_at (w) = mn_now + w->repeat;
1936 adjustheap (timers, timercnt, ((W)w)->active);
1937 }
1938 else
1939 ev_timer_stop (EV_A_ w);
1940 }
1941 else if (w->repeat)
1942 {
1943 w->at = w->repeat;
1944 ev_timer_start (EV_A_ w);
1945 }
1946 }
1947
1948 #if EV_PERIODIC_ENABLE
1949 void noinline
1950 ev_periodic_start (EV_P_ ev_periodic *w)
1951 {
1952 if (expect_false (ev_is_active (w)))
1953 return;
1954
1955 if (w->reschedule_cb)
1956 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1957 else if (w->interval)
1958 {
1959 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1960 /* this formula differs from the one in periodic_reify because we do not always round up */
1961 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1962 }
1963 else
1964 ev_at (w) = w->offset;
1965
1966 ev_start (EV_A_ (W)w, ++periodiccnt);
1967 array_needsize (WT, periodics, periodicmax, periodiccnt + 1, EMPTY2);
1968 periodics [periodiccnt] = (WT)w;
1969 upheap (periodics, periodiccnt);
1970
1971 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1972 }
1973
1974 void noinline
1975 ev_periodic_stop (EV_P_ ev_periodic *w)
1976 {
1977 clear_pending (EV_A_ (W)w);
1978 if (expect_false (!ev_is_active (w)))
1979 return;
1980
1981 assert (("internal periodic heap corruption", periodics [((W)w)->active] == (WT)w));
1982
1983 {
1984 int active = ((W)w)->active;
1985
1986 if (expect_true (active < periodiccnt))
1987 {
1988 periodics [active] = periodics [periodiccnt];
1989 adjustheap (periodics, periodiccnt, active);
1990 }
1991
1992 --periodiccnt;
1993 }
1994
1995 ev_stop (EV_A_ (W)w);
1996 }
1997
1998 void noinline
1999 ev_periodic_again (EV_P_ ev_periodic *w)
2000 {
2001 /* TODO: use adjustheap and recalculation */
2002 ev_periodic_stop (EV_A_ w);
2003 ev_periodic_start (EV_A_ w);
2004 }
2005 #endif
2006
2007 #ifndef SA_RESTART
2008 # define SA_RESTART 0
2009 #endif
2010
2011 void noinline
2012 ev_signal_start (EV_P_ ev_signal *w)
2013 {
2014 #if EV_MULTIPLICITY
2015 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2016 #endif
2017 if (expect_false (ev_is_active (w)))
2018 return;
2019
2020 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2021
2022 evpipe_init (EV_A);
2023
2024 {
2025 #ifndef _WIN32
2026 sigset_t full, prev;
2027 sigfillset (&full);
2028 sigprocmask (SIG_SETMASK, &full, &prev);
2029 #endif
2030
2031 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2032
2033 #ifndef _WIN32
2034 sigprocmask (SIG_SETMASK, &prev, 0);
2035 #endif
2036 }
2037
2038 ev_start (EV_A_ (W)w, 1);
2039 wlist_add (&signals [w->signum - 1].head, (WL)w);
2040
2041 if (!((WL)w)->next)
2042 {
2043 #if _WIN32
2044 signal (w->signum, ev_sighandler);
2045 #else
2046 struct sigaction sa;
2047 sa.sa_handler = ev_sighandler;
2048 sigfillset (&sa.sa_mask);
2049 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2050 sigaction (w->signum, &sa, 0);
2051 #endif
2052 }
2053 }
2054
2055 void noinline
2056 ev_signal_stop (EV_P_ ev_signal *w)
2057 {
2058 clear_pending (EV_A_ (W)w);
2059 if (expect_false (!ev_is_active (w)))
2060 return;
2061
2062 wlist_del (&signals [w->signum - 1].head, (WL)w);
2063 ev_stop (EV_A_ (W)w);
2064
2065 if (!signals [w->signum - 1].head)
2066 signal (w->signum, SIG_DFL);
2067 }
2068
2069 void
2070 ev_child_start (EV_P_ ev_child *w)
2071 {
2072 #if EV_MULTIPLICITY
2073 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2074 #endif
2075 if (expect_false (ev_is_active (w)))
2076 return;
2077
2078 ev_start (EV_A_ (W)w, 1);
2079 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2080 }
2081
2082 void
2083 ev_child_stop (EV_P_ ev_child *w)
2084 {
2085 clear_pending (EV_A_ (W)w);
2086 if (expect_false (!ev_is_active (w)))
2087 return;
2088
2089 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2090 ev_stop (EV_A_ (W)w);
2091 }
2092
2093 #if EV_STAT_ENABLE
2094
2095 # ifdef _WIN32
2096 # undef lstat
2097 # define lstat(a,b) _stati64 (a,b)
2098 # endif
2099
2100 #define DEF_STAT_INTERVAL 5.0074891
2101 #define MIN_STAT_INTERVAL 0.1074891
2102
2103 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2104
2105 #if EV_USE_INOTIFY
2106 # define EV_INOTIFY_BUFSIZE 8192
2107
2108 static void noinline
2109 infy_add (EV_P_ ev_stat *w)
2110 {
2111 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);
2112
2113 if (w->wd < 0)
2114 {
2115 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2116
2117 /* monitor some parent directory for speedup hints */
2118 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2119 {
2120 char path [4096];
2121 strcpy (path, w->path);
2122
2123 do
2124 {
2125 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2126 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2127
2128 char *pend = strrchr (path, '/');
2129
2130 if (!pend)
2131 break; /* whoops, no '/', complain to your admin */
2132
2133 *pend = 0;
2134 w->wd = inotify_add_watch (fs_fd, path, mask);
2135 }
2136 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2137 }
2138 }
2139 else
2140 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2141
2142 if (w->wd >= 0)
2143 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2144 }
2145
2146 static void noinline
2147 infy_del (EV_P_ ev_stat *w)
2148 {
2149 int slot;
2150 int wd = w->wd;
2151
2152 if (wd < 0)
2153 return;
2154
2155 w->wd = -2;
2156 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2157 wlist_del (&fs_hash [slot].head, (WL)w);
2158
2159 /* remove this watcher, if others are watching it, they will rearm */
2160 inotify_rm_watch (fs_fd, wd);
2161 }
2162
2163 static void noinline
2164 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2165 {
2166 if (slot < 0)
2167 /* overflow, need to check for all hahs slots */
2168 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2169 infy_wd (EV_A_ slot, wd, ev);
2170 else
2171 {
2172 WL w_;
2173
2174 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2175 {
2176 ev_stat *w = (ev_stat *)w_;
2177 w_ = w_->next; /* lets us remove this watcher and all before it */
2178
2179 if (w->wd == wd || wd == -1)
2180 {
2181 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2182 {
2183 w->wd = -1;
2184 infy_add (EV_A_ w); /* re-add, no matter what */
2185 }
2186
2187 stat_timer_cb (EV_A_ &w->timer, 0);
2188 }
2189 }
2190 }
2191 }
2192
2193 static void
2194 infy_cb (EV_P_ ev_io *w, int revents)
2195 {
2196 char buf [EV_INOTIFY_BUFSIZE];
2197 struct inotify_event *ev = (struct inotify_event *)buf;
2198 int ofs;
2199 int len = read (fs_fd, buf, sizeof (buf));
2200
2201 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2202 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2203 }
2204
2205 void inline_size
2206 infy_init (EV_P)
2207 {
2208 if (fs_fd != -2)
2209 return;
2210
2211 fs_fd = inotify_init ();
2212
2213 if (fs_fd >= 0)
2214 {
2215 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2216 ev_set_priority (&fs_w, EV_MAXPRI);
2217 ev_io_start (EV_A_ &fs_w);
2218 }
2219 }
2220
2221 void inline_size
2222 infy_fork (EV_P)
2223 {
2224 int slot;
2225
2226 if (fs_fd < 0)
2227 return;
2228
2229 close (fs_fd);
2230 fs_fd = inotify_init ();
2231
2232 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2233 {
2234 WL w_ = fs_hash [slot].head;
2235 fs_hash [slot].head = 0;
2236
2237 while (w_)
2238 {
2239 ev_stat *w = (ev_stat *)w_;
2240 w_ = w_->next; /* lets us add this watcher */
2241
2242 w->wd = -1;
2243
2244 if (fs_fd >= 0)
2245 infy_add (EV_A_ w); /* re-add, no matter what */
2246 else
2247 ev_timer_start (EV_A_ &w->timer);
2248 }
2249
2250 }
2251 }
2252
2253 #endif
2254
2255 void
2256 ev_stat_stat (EV_P_ ev_stat *w)
2257 {
2258 if (lstat (w->path, &w->attr) < 0)
2259 w->attr.st_nlink = 0;
2260 else if (!w->attr.st_nlink)
2261 w->attr.st_nlink = 1;
2262 }
2263
2264 static void noinline
2265 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2266 {
2267 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2268
2269 /* we copy this here each the time so that */
2270 /* prev has the old value when the callback gets invoked */
2271 w->prev = w->attr;
2272 ev_stat_stat (EV_A_ w);
2273
2274 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2275 if (
2276 w->prev.st_dev != w->attr.st_dev
2277 || w->prev.st_ino != w->attr.st_ino
2278 || w->prev.st_mode != w->attr.st_mode
2279 || w->prev.st_nlink != w->attr.st_nlink
2280 || w->prev.st_uid != w->attr.st_uid
2281 || w->prev.st_gid != w->attr.st_gid
2282 || w->prev.st_rdev != w->attr.st_rdev
2283 || w->prev.st_size != w->attr.st_size
2284 || w->prev.st_atime != w->attr.st_atime
2285 || w->prev.st_mtime != w->attr.st_mtime
2286 || w->prev.st_ctime != w->attr.st_ctime
2287 ) {
2288 #if EV_USE_INOTIFY
2289 infy_del (EV_A_ w);
2290 infy_add (EV_A_ w);
2291 ev_stat_stat (EV_A_ w); /* avoid race... */
2292 #endif
2293
2294 ev_feed_event (EV_A_ w, EV_STAT);
2295 }
2296 }
2297
2298 void
2299 ev_stat_start (EV_P_ ev_stat *w)
2300 {
2301 if (expect_false (ev_is_active (w)))
2302 return;
2303
2304 /* since we use memcmp, we need to clear any padding data etc. */
2305 memset (&w->prev, 0, sizeof (ev_statdata));
2306 memset (&w->attr, 0, sizeof (ev_statdata));
2307
2308 ev_stat_stat (EV_A_ w);
2309
2310 if (w->interval < MIN_STAT_INTERVAL)
2311 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2312
2313 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2314 ev_set_priority (&w->timer, ev_priority (w));
2315
2316 #if EV_USE_INOTIFY
2317 infy_init (EV_A);
2318
2319 if (fs_fd >= 0)
2320 infy_add (EV_A_ w);
2321 else
2322 #endif
2323 ev_timer_start (EV_A_ &w->timer);
2324
2325 ev_start (EV_A_ (W)w, 1);
2326 }
2327
2328 void
2329 ev_stat_stop (EV_P_ ev_stat *w)
2330 {
2331 clear_pending (EV_A_ (W)w);
2332 if (expect_false (!ev_is_active (w)))
2333 return;
2334
2335 #if EV_USE_INOTIFY
2336 infy_del (EV_A_ w);
2337 #endif
2338 ev_timer_stop (EV_A_ &w->timer);
2339
2340 ev_stop (EV_A_ (W)w);
2341 }
2342 #endif
2343
2344 #if EV_IDLE_ENABLE
2345 void
2346 ev_idle_start (EV_P_ ev_idle *w)
2347 {
2348 if (expect_false (ev_is_active (w)))
2349 return;
2350
2351 pri_adjust (EV_A_ (W)w);
2352
2353 {
2354 int active = ++idlecnt [ABSPRI (w)];
2355
2356 ++idleall;
2357 ev_start (EV_A_ (W)w, active);
2358
2359 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2360 idles [ABSPRI (w)][active - 1] = w;
2361 }
2362 }
2363
2364 void
2365 ev_idle_stop (EV_P_ ev_idle *w)
2366 {
2367 clear_pending (EV_A_ (W)w);
2368 if (expect_false (!ev_is_active (w)))
2369 return;
2370
2371 {
2372 int active = ((W)w)->active;
2373
2374 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2375 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2376
2377 ev_stop (EV_A_ (W)w);
2378 --idleall;
2379 }
2380 }
2381 #endif
2382
2383 void
2384 ev_prepare_start (EV_P_ ev_prepare *w)
2385 {
2386 if (expect_false (ev_is_active (w)))
2387 return;
2388
2389 ev_start (EV_A_ (W)w, ++preparecnt);
2390 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2391 prepares [preparecnt - 1] = w;
2392 }
2393
2394 void
2395 ev_prepare_stop (EV_P_ ev_prepare *w)
2396 {
2397 clear_pending (EV_A_ (W)w);
2398 if (expect_false (!ev_is_active (w)))
2399 return;
2400
2401 {
2402 int active = ((W)w)->active;
2403 prepares [active - 1] = prepares [--preparecnt];
2404 ((W)prepares [active - 1])->active = active;
2405 }
2406
2407 ev_stop (EV_A_ (W)w);
2408 }
2409
2410 void
2411 ev_check_start (EV_P_ ev_check *w)
2412 {
2413 if (expect_false (ev_is_active (w)))
2414 return;
2415
2416 ev_start (EV_A_ (W)w, ++checkcnt);
2417 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2418 checks [checkcnt - 1] = w;
2419 }
2420
2421 void
2422 ev_check_stop (EV_P_ ev_check *w)
2423 {
2424 clear_pending (EV_A_ (W)w);
2425 if (expect_false (!ev_is_active (w)))
2426 return;
2427
2428 {
2429 int active = ((W)w)->active;
2430 checks [active - 1] = checks [--checkcnt];
2431 ((W)checks [active - 1])->active = active;
2432 }
2433
2434 ev_stop (EV_A_ (W)w);
2435 }
2436
2437 #if EV_EMBED_ENABLE
2438 void noinline
2439 ev_embed_sweep (EV_P_ ev_embed *w)
2440 {
2441 ev_loop (w->other, EVLOOP_NONBLOCK);
2442 }
2443
2444 static void
2445 embed_io_cb (EV_P_ ev_io *io, int revents)
2446 {
2447 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2448
2449 if (ev_cb (w))
2450 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2451 else
2452 ev_loop (w->other, EVLOOP_NONBLOCK);
2453 }
2454
2455 static void
2456 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2457 {
2458 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2459
2460 {
2461 struct ev_loop *loop = w->other;
2462
2463 while (fdchangecnt)
2464 {
2465 fd_reify (EV_A);
2466 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2467 }
2468 }
2469 }
2470
2471 #if 0
2472 static void
2473 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2474 {
2475 ev_idle_stop (EV_A_ idle);
2476 }
2477 #endif
2478
2479 void
2480 ev_embed_start (EV_P_ ev_embed *w)
2481 {
2482 if (expect_false (ev_is_active (w)))
2483 return;
2484
2485 {
2486 struct ev_loop *loop = w->other;
2487 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2488 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2489 }
2490
2491 ev_set_priority (&w->io, ev_priority (w));
2492 ev_io_start (EV_A_ &w->io);
2493
2494 ev_prepare_init (&w->prepare, embed_prepare_cb);
2495 ev_set_priority (&w->prepare, EV_MINPRI);
2496 ev_prepare_start (EV_A_ &w->prepare);
2497
2498 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2499
2500 ev_start (EV_A_ (W)w, 1);
2501 }
2502
2503 void
2504 ev_embed_stop (EV_P_ ev_embed *w)
2505 {
2506 clear_pending (EV_A_ (W)w);
2507 if (expect_false (!ev_is_active (w)))
2508 return;
2509
2510 ev_io_stop (EV_A_ &w->io);
2511 ev_prepare_stop (EV_A_ &w->prepare);
2512
2513 ev_stop (EV_A_ (W)w);
2514 }
2515 #endif
2516
2517 #if EV_FORK_ENABLE
2518 void
2519 ev_fork_start (EV_P_ ev_fork *w)
2520 {
2521 if (expect_false (ev_is_active (w)))
2522 return;
2523
2524 ev_start (EV_A_ (W)w, ++forkcnt);
2525 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2526 forks [forkcnt - 1] = w;
2527 }
2528
2529 void
2530 ev_fork_stop (EV_P_ ev_fork *w)
2531 {
2532 clear_pending (EV_A_ (W)w);
2533 if (expect_false (!ev_is_active (w)))
2534 return;
2535
2536 {
2537 int active = ((W)w)->active;
2538 forks [active - 1] = forks [--forkcnt];
2539 ((W)forks [active - 1])->active = active;
2540 }
2541
2542 ev_stop (EV_A_ (W)w);
2543 }
2544 #endif
2545
2546 #if EV_ASYNC_ENABLE
2547 void
2548 ev_async_start (EV_P_ ev_async *w)
2549 {
2550 if (expect_false (ev_is_active (w)))
2551 return;
2552
2553 evpipe_init (EV_A);
2554
2555 ev_start (EV_A_ (W)w, ++asynccnt);
2556 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2557 asyncs [asynccnt - 1] = w;
2558 }
2559
2560 void
2561 ev_async_stop (EV_P_ ev_async *w)
2562 {
2563 clear_pending (EV_A_ (W)w);
2564 if (expect_false (!ev_is_active (w)))
2565 return;
2566
2567 {
2568 int active = ((W)w)->active;
2569 asyncs [active - 1] = asyncs [--asynccnt];
2570 ((W)asyncs [active - 1])->active = active;
2571 }
2572
2573 ev_stop (EV_A_ (W)w);
2574 }
2575
2576 void
2577 ev_async_send (EV_P_ ev_async *w)
2578 {
2579 w->sent = 1;
2580 evpipe_write (EV_A_ &gotasync);
2581 }
2582 #endif
2583
2584 /*****************************************************************************/
2585
2586 struct ev_once
2587 {
2588 ev_io io;
2589 ev_timer to;
2590 void (*cb)(int revents, void *arg);
2591 void *arg;
2592 };
2593
2594 static void
2595 once_cb (EV_P_ struct ev_once *once, int revents)
2596 {
2597 void (*cb)(int revents, void *arg) = once->cb;
2598 void *arg = once->arg;
2599
2600 ev_io_stop (EV_A_ &once->io);
2601 ev_timer_stop (EV_A_ &once->to);
2602 ev_free (once);
2603
2604 cb (revents, arg);
2605 }
2606
2607 static void
2608 once_cb_io (EV_P_ ev_io *w, int revents)
2609 {
2610 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2611 }
2612
2613 static void
2614 once_cb_to (EV_P_ ev_timer *w, int revents)
2615 {
2616 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2617 }
2618
2619 void
2620 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2621 {
2622 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2623
2624 if (expect_false (!once))
2625 {
2626 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2627 return;
2628 }
2629
2630 once->cb = cb;
2631 once->arg = arg;
2632
2633 ev_init (&once->io, once_cb_io);
2634 if (fd >= 0)
2635 {
2636 ev_io_set (&once->io, fd, events);
2637 ev_io_start (EV_A_ &once->io);
2638 }
2639
2640 ev_init (&once->to, once_cb_to);
2641 if (timeout >= 0.)
2642 {
2643 ev_timer_set (&once->to, timeout, 0.);
2644 ev_timer_start (EV_A_ &once->to);
2645 }
2646 }
2647
2648 #if EV_MULTIPLICITY
2649 #include "ev_wrap.h"
2650 #endif
2651
2652 #ifdef __cplusplus
2653 }
2654 #endif
2655