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Revision: 1.231
Committed: Mon May 5 20:47:33 2008 UTC (16 years, 2 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.230: +1 -1 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 /* this big block deduces configuration from config.h */
45 #ifndef EV_STANDALONE
46 # ifdef EV_CONFIG_H
47 # include EV_CONFIG_H
48 # else
49 # include "config.h"
50 # endif
51
52 # if HAVE_CLOCK_GETTIME
53 # ifndef EV_USE_MONOTONIC
54 # define EV_USE_MONOTONIC 1
55 # endif
56 # ifndef EV_USE_REALTIME
57 # define EV_USE_REALTIME 1
58 # endif
59 # else
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 0
62 # endif
63 # ifndef EV_USE_REALTIME
64 # define EV_USE_REALTIME 0
65 # endif
66 # endif
67
68 # ifndef EV_USE_NANOSLEEP
69 # if HAVE_NANOSLEEP
70 # define EV_USE_NANOSLEEP 1
71 # else
72 # define EV_USE_NANOSLEEP 0
73 # endif
74 # endif
75
76 # ifndef EV_USE_SELECT
77 # if HAVE_SELECT && HAVE_SYS_SELECT_H
78 # define EV_USE_SELECT 1
79 # else
80 # define EV_USE_SELECT 0
81 # endif
82 # endif
83
84 # ifndef EV_USE_POLL
85 # if HAVE_POLL && HAVE_POLL_H
86 # define EV_USE_POLL 1
87 # else
88 # define EV_USE_POLL 0
89 # endif
90 # endif
91
92 # ifndef EV_USE_EPOLL
93 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
94 # define EV_USE_EPOLL 1
95 # else
96 # define EV_USE_EPOLL 0
97 # endif
98 # endif
99
100 # ifndef EV_USE_KQUEUE
101 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
102 # define EV_USE_KQUEUE 1
103 # else
104 # define EV_USE_KQUEUE 0
105 # endif
106 # endif
107
108 # ifndef EV_USE_PORT
109 # if HAVE_PORT_H && HAVE_PORT_CREATE
110 # define EV_USE_PORT 1
111 # else
112 # define EV_USE_PORT 0
113 # endif
114 # endif
115
116 # ifndef EV_USE_INOTIFY
117 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
118 # define EV_USE_INOTIFY 1
119 # else
120 # define EV_USE_INOTIFY 0
121 # endif
122 # endif
123
124 # ifndef EV_USE_EVENTFD
125 # if HAVE_EVENTFD
126 # define EV_USE_EVENTFD 1
127 # else
128 # define EV_USE_EVENTFD 0
129 # endif
130 # endif
131
132 #endif
133
134 #include <math.h>
135 #include <stdlib.h>
136 #include <fcntl.h>
137 #include <stddef.h>
138
139 #include <stdio.h>
140
141 #include <assert.h>
142 #include <errno.h>
143 #include <sys/types.h>
144 #include <time.h>
145
146 #include <signal.h>
147
148 #ifdef EV_H
149 # include EV_H
150 #else
151 # include "ev.h"
152 #endif
153
154 #ifndef _WIN32
155 # include <sys/time.h>
156 # include <sys/wait.h>
157 # include <unistd.h>
158 #else
159 # define WIN32_LEAN_AND_MEAN
160 # include <windows.h>
161 # ifndef EV_SELECT_IS_WINSOCKET
162 # define EV_SELECT_IS_WINSOCKET 1
163 # endif
164 #endif
165
166 /* this block tries to deduce configuration from header-defined symbols and defaults */
167
168 #ifndef EV_USE_MONOTONIC
169 # define EV_USE_MONOTONIC 0
170 #endif
171
172 #ifndef EV_USE_REALTIME
173 # define EV_USE_REALTIME 0
174 #endif
175
176 #ifndef EV_USE_NANOSLEEP
177 # define EV_USE_NANOSLEEP 0
178 #endif
179
180 #ifndef EV_USE_SELECT
181 # define EV_USE_SELECT 1
182 #endif
183
184 #ifndef EV_USE_POLL
185 # ifdef _WIN32
186 # define EV_USE_POLL 0
187 # else
188 # define EV_USE_POLL 1
189 # endif
190 #endif
191
192 #ifndef EV_USE_EPOLL
193 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
194 # define EV_USE_EPOLL 1
195 # else
196 # define EV_USE_EPOLL 0
197 # endif
198 #endif
199
200 #ifndef EV_USE_KQUEUE
201 # define EV_USE_KQUEUE 0
202 #endif
203
204 #ifndef EV_USE_PORT
205 # define EV_USE_PORT 0
206 #endif
207
208 #ifndef EV_USE_INOTIFY
209 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
210 # define EV_USE_INOTIFY 1
211 # else
212 # define EV_USE_INOTIFY 0
213 # endif
214 #endif
215
216 #ifndef EV_PID_HASHSIZE
217 # if EV_MINIMAL
218 # define EV_PID_HASHSIZE 1
219 # else
220 # define EV_PID_HASHSIZE 16
221 # endif
222 #endif
223
224 #ifndef EV_INOTIFY_HASHSIZE
225 # if EV_MINIMAL
226 # define EV_INOTIFY_HASHSIZE 1
227 # else
228 # define EV_INOTIFY_HASHSIZE 16
229 # endif
230 #endif
231
232 #ifndef EV_USE_EVENTFD
233 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
234 # define EV_USE_EVENTFD 1
235 # else
236 # define EV_USE_EVENTFD 0
237 # endif
238 #endif
239
240 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
241
242 #ifndef CLOCK_MONOTONIC
243 # undef EV_USE_MONOTONIC
244 # define EV_USE_MONOTONIC 0
245 #endif
246
247 #ifndef CLOCK_REALTIME
248 # undef EV_USE_REALTIME
249 # define EV_USE_REALTIME 0
250 #endif
251
252 #if !EV_STAT_ENABLE
253 # undef EV_USE_INOTIFY
254 # define EV_USE_INOTIFY 0
255 #endif
256
257 #if !EV_USE_NANOSLEEP
258 # ifndef _WIN32
259 # include <sys/select.h>
260 # endif
261 #endif
262
263 #if EV_USE_INOTIFY
264 # include <sys/inotify.h>
265 #endif
266
267 #if EV_SELECT_IS_WINSOCKET
268 # include <winsock.h>
269 #endif
270
271 #if EV_USE_EVENTFD
272 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
273 # include <stdint.h>
274 # ifdef __cplusplus
275 extern "C" {
276 # endif
277 int eventfd (unsigned int initval, int flags);
278 # ifdef __cplusplus
279 }
280 # endif
281 #endif
282
283 /**/
284
285 /*
286 * This is used to avoid floating point rounding problems.
287 * It is added to ev_rt_now when scheduling periodics
288 * to ensure progress, time-wise, even when rounding
289 * errors are against us.
290 * This value is good at least till the year 4000.
291 * Better solutions welcome.
292 */
293 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
294
295 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
296 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
297 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
298
299 #if __GNUC__ >= 4
300 # define expect(expr,value) __builtin_expect ((expr),(value))
301 # define noinline __attribute__ ((noinline))
302 #else
303 # define expect(expr,value) (expr)
304 # define noinline
305 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
306 # define inline
307 # endif
308 #endif
309
310 #define expect_false(expr) expect ((expr) != 0, 0)
311 #define expect_true(expr) expect ((expr) != 0, 1)
312 #define inline_size static inline
313
314 #if EV_MINIMAL
315 # define inline_speed static noinline
316 #else
317 # define inline_speed static inline
318 #endif
319
320 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
321 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
322
323 #define EMPTY /* required for microsofts broken pseudo-c compiler */
324 #define EMPTY2(a,b) /* used to suppress some warnings */
325
326 typedef ev_watcher *W;
327 typedef ev_watcher_list *WL;
328 typedef ev_watcher_time *WT;
329
330 #define ev_active(w) ((W)(w))->active
331 #define ev_at(w) ((WT)(w))->at
332
333 #if EV_USE_MONOTONIC
334 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
335 /* giving it a reasonably high chance of working on typical architetcures */
336 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
337 #endif
338
339 #ifdef _WIN32
340 # include "ev_win32.c"
341 #endif
342
343 /*****************************************************************************/
344
345 static void (*syserr_cb)(const char *msg);
346
347 void
348 ev_set_syserr_cb (void (*cb)(const char *msg))
349 {
350 syserr_cb = cb;
351 }
352
353 static void noinline
354 syserr (const char *msg)
355 {
356 if (!msg)
357 msg = "(libev) system error";
358
359 if (syserr_cb)
360 syserr_cb (msg);
361 else
362 {
363 perror (msg);
364 abort ();
365 }
366 }
367
368 static void *
369 ev_realloc_emul (void *ptr, long size)
370 {
371 /* some systems, notably openbsd and darwin, fail to properly
372 * implement realloc (x, 0) (as required by both ansi c-98 and
373 * the single unix specification, so work around them here.
374 */
375
376 if (size)
377 return realloc (ptr, size);
378
379 free (ptr);
380 return 0;
381 }
382
383 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
384
385 void
386 ev_set_allocator (void *(*cb)(void *ptr, long size))
387 {
388 alloc = cb;
389 }
390
391 inline_speed void *
392 ev_realloc (void *ptr, long size)
393 {
394 ptr = alloc (ptr, size);
395
396 if (!ptr && size)
397 {
398 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
399 abort ();
400 }
401
402 return ptr;
403 }
404
405 #define ev_malloc(size) ev_realloc (0, (size))
406 #define ev_free(ptr) ev_realloc ((ptr), 0)
407
408 /*****************************************************************************/
409
410 typedef struct
411 {
412 WL head;
413 unsigned char events;
414 unsigned char reify;
415 #if EV_SELECT_IS_WINSOCKET
416 SOCKET handle;
417 #endif
418 } ANFD;
419
420 typedef struct
421 {
422 W w;
423 int events;
424 } ANPENDING;
425
426 #if EV_USE_INOTIFY
427 typedef struct
428 {
429 WL head;
430 } ANFS;
431 #endif
432
433 #if EV_MULTIPLICITY
434
435 struct ev_loop
436 {
437 ev_tstamp ev_rt_now;
438 #define ev_rt_now ((loop)->ev_rt_now)
439 #define VAR(name,decl) decl;
440 #include "ev_vars.h"
441 #undef VAR
442 };
443 #include "ev_wrap.h"
444
445 static struct ev_loop default_loop_struct;
446 struct ev_loop *ev_default_loop_ptr;
447
448 #else
449
450 ev_tstamp ev_rt_now;
451 #define VAR(name,decl) static decl;
452 #include "ev_vars.h"
453 #undef VAR
454
455 static int ev_default_loop_ptr;
456
457 #endif
458
459 /*****************************************************************************/
460
461 ev_tstamp
462 ev_time (void)
463 {
464 #if EV_USE_REALTIME
465 struct timespec ts;
466 clock_gettime (CLOCK_REALTIME, &ts);
467 return ts.tv_sec + ts.tv_nsec * 1e-9;
468 #else
469 struct timeval tv;
470 gettimeofday (&tv, 0);
471 return tv.tv_sec + tv.tv_usec * 1e-6;
472 #endif
473 }
474
475 ev_tstamp inline_size
476 get_clock (void)
477 {
478 #if EV_USE_MONOTONIC
479 if (expect_true (have_monotonic))
480 {
481 struct timespec ts;
482 clock_gettime (CLOCK_MONOTONIC, &ts);
483 return ts.tv_sec + ts.tv_nsec * 1e-9;
484 }
485 #endif
486
487 return ev_time ();
488 }
489
490 #if EV_MULTIPLICITY
491 ev_tstamp
492 ev_now (EV_P)
493 {
494 return ev_rt_now;
495 }
496 #endif
497
498 void
499 ev_sleep (ev_tstamp delay)
500 {
501 if (delay > 0.)
502 {
503 #if EV_USE_NANOSLEEP
504 struct timespec ts;
505
506 ts.tv_sec = (time_t)delay;
507 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
508
509 nanosleep (&ts, 0);
510 #elif defined(_WIN32)
511 Sleep ((unsigned long)(delay * 1e3));
512 #else
513 struct timeval tv;
514
515 tv.tv_sec = (time_t)delay;
516 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
517
518 select (0, 0, 0, 0, &tv);
519 #endif
520 }
521 }
522
523 /*****************************************************************************/
524
525 int inline_size
526 array_nextsize (int elem, int cur, int cnt)
527 {
528 int ncur = cur + 1;
529
530 do
531 ncur <<= 1;
532 while (cnt > ncur);
533
534 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
535 if (elem * ncur > 4096)
536 {
537 ncur *= elem;
538 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
539 ncur = ncur - sizeof (void *) * 4;
540 ncur /= elem;
541 }
542
543 return ncur;
544 }
545
546 static noinline void *
547 array_realloc (int elem, void *base, int *cur, int cnt)
548 {
549 *cur = array_nextsize (elem, *cur, cnt);
550 return ev_realloc (base, elem * *cur);
551 }
552
553 #define array_needsize(type,base,cur,cnt,init) \
554 if (expect_false ((cnt) > (cur))) \
555 { \
556 int ocur_ = (cur); \
557 (base) = (type *)array_realloc \
558 (sizeof (type), (base), &(cur), (cnt)); \
559 init ((base) + (ocur_), (cur) - ocur_); \
560 }
561
562 #if 0
563 #define array_slim(type,stem) \
564 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
565 { \
566 stem ## max = array_roundsize (stem ## cnt >> 1); \
567 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
568 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
569 }
570 #endif
571
572 #define array_free(stem, idx) \
573 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
574
575 /*****************************************************************************/
576
577 void noinline
578 ev_feed_event (EV_P_ void *w, int revents)
579 {
580 W w_ = (W)w;
581 int pri = ABSPRI (w_);
582
583 if (expect_false (w_->pending))
584 pendings [pri][w_->pending - 1].events |= revents;
585 else
586 {
587 w_->pending = ++pendingcnt [pri];
588 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
589 pendings [pri][w_->pending - 1].w = w_;
590 pendings [pri][w_->pending - 1].events = revents;
591 }
592 }
593
594 void inline_speed
595 queue_events (EV_P_ W *events, int eventcnt, int type)
596 {
597 int i;
598
599 for (i = 0; i < eventcnt; ++i)
600 ev_feed_event (EV_A_ events [i], type);
601 }
602
603 /*****************************************************************************/
604
605 void inline_size
606 anfds_init (ANFD *base, int count)
607 {
608 while (count--)
609 {
610 base->head = 0;
611 base->events = EV_NONE;
612 base->reify = 0;
613
614 ++base;
615 }
616 }
617
618 void inline_speed
619 fd_event (EV_P_ int fd, int revents)
620 {
621 ANFD *anfd = anfds + fd;
622 ev_io *w;
623
624 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
625 {
626 int ev = w->events & revents;
627
628 if (ev)
629 ev_feed_event (EV_A_ (W)w, ev);
630 }
631 }
632
633 void
634 ev_feed_fd_event (EV_P_ int fd, int revents)
635 {
636 if (fd >= 0 && fd < anfdmax)
637 fd_event (EV_A_ fd, revents);
638 }
639
640 void inline_size
641 fd_reify (EV_P)
642 {
643 int i;
644
645 for (i = 0; i < fdchangecnt; ++i)
646 {
647 int fd = fdchanges [i];
648 ANFD *anfd = anfds + fd;
649 ev_io *w;
650
651 unsigned char events = 0;
652
653 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
654 events |= (unsigned char)w->events;
655
656 #if EV_SELECT_IS_WINSOCKET
657 if (events)
658 {
659 unsigned long argp;
660 #ifdef EV_FD_TO_WIN32_HANDLE
661 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
662 #else
663 anfd->handle = _get_osfhandle (fd);
664 #endif
665 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
666 }
667 #endif
668
669 {
670 unsigned char o_events = anfd->events;
671 unsigned char o_reify = anfd->reify;
672
673 anfd->reify = 0;
674 anfd->events = events;
675
676 if (o_events != events || o_reify & EV_IOFDSET)
677 backend_modify (EV_A_ fd, o_events, events);
678 }
679 }
680
681 fdchangecnt = 0;
682 }
683
684 void inline_size
685 fd_change (EV_P_ int fd, int flags)
686 {
687 unsigned char reify = anfds [fd].reify;
688 anfds [fd].reify |= flags;
689
690 if (expect_true (!reify))
691 {
692 ++fdchangecnt;
693 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
694 fdchanges [fdchangecnt - 1] = fd;
695 }
696 }
697
698 void inline_speed
699 fd_kill (EV_P_ int fd)
700 {
701 ev_io *w;
702
703 while ((w = (ev_io *)anfds [fd].head))
704 {
705 ev_io_stop (EV_A_ w);
706 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
707 }
708 }
709
710 int inline_size
711 fd_valid (int fd)
712 {
713 #ifdef _WIN32
714 return _get_osfhandle (fd) != -1;
715 #else
716 return fcntl (fd, F_GETFD) != -1;
717 #endif
718 }
719
720 /* called on EBADF to verify fds */
721 static void noinline
722 fd_ebadf (EV_P)
723 {
724 int fd;
725
726 for (fd = 0; fd < anfdmax; ++fd)
727 if (anfds [fd].events)
728 if (!fd_valid (fd) == -1 && errno == EBADF)
729 fd_kill (EV_A_ fd);
730 }
731
732 /* called on ENOMEM in select/poll to kill some fds and retry */
733 static void noinline
734 fd_enomem (EV_P)
735 {
736 int fd;
737
738 for (fd = anfdmax; fd--; )
739 if (anfds [fd].events)
740 {
741 fd_kill (EV_A_ fd);
742 return;
743 }
744 }
745
746 /* usually called after fork if backend needs to re-arm all fds from scratch */
747 static void noinline
748 fd_rearm_all (EV_P)
749 {
750 int fd;
751
752 for (fd = 0; fd < anfdmax; ++fd)
753 if (anfds [fd].events)
754 {
755 anfds [fd].events = 0;
756 fd_change (EV_A_ fd, EV_IOFDSET | 1);
757 }
758 }
759
760 /*****************************************************************************/
761
762 /* towards the root */
763 void inline_speed
764 upheap (WT *heap, int k)
765 {
766 WT w = heap [k];
767
768 for (;;)
769 {
770 int p = k >> 1;
771
772 /* maybe we could use a dummy element at heap [0]? */
773 if (!p || heap [p]->at <= w->at)
774 break;
775
776 heap [k] = heap [p];
777 ev_active (heap [k]) = k;
778 k = p;
779 }
780
781 heap [k] = w;
782 ev_active (heap [k]) = k;
783 }
784
785 /* away from the root */
786 void inline_speed
787 downheap (WT *heap, int N, int k)
788 {
789 WT w = heap [k];
790
791 for (;;)
792 {
793 int c = k << 1;
794
795 if (c > N)
796 break;
797
798 c += c < N && heap [c]->at > heap [c + 1]->at
799 ? 1 : 0;
800
801 if (w->at <= heap [c]->at)
802 break;
803
804 heap [k] = heap [c];
805 ev_active (heap [k]) = k;
806
807 k = c;
808 }
809
810 heap [k] = w;
811 ev_active (heap [k]) = k;
812 }
813
814 void inline_size
815 adjustheap (WT *heap, int N, int k)
816 {
817 upheap (heap, k);
818 downheap (heap, N, k);
819 }
820
821 /*****************************************************************************/
822
823 typedef struct
824 {
825 WL head;
826 EV_ATOMIC_T gotsig;
827 } ANSIG;
828
829 static ANSIG *signals;
830 static int signalmax;
831
832 static EV_ATOMIC_T gotsig;
833
834 void inline_size
835 signals_init (ANSIG *base, int count)
836 {
837 while (count--)
838 {
839 base->head = 0;
840 base->gotsig = 0;
841
842 ++base;
843 }
844 }
845
846 /*****************************************************************************/
847
848 void inline_speed
849 fd_intern (int fd)
850 {
851 #ifdef _WIN32
852 int arg = 1;
853 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
854 #else
855 fcntl (fd, F_SETFD, FD_CLOEXEC);
856 fcntl (fd, F_SETFL, O_NONBLOCK);
857 #endif
858 }
859
860 static void noinline
861 evpipe_init (EV_P)
862 {
863 if (!ev_is_active (&pipeev))
864 {
865 #if EV_USE_EVENTFD
866 if ((evfd = eventfd (0, 0)) >= 0)
867 {
868 evpipe [0] = -1;
869 fd_intern (evfd);
870 ev_io_set (&pipeev, evfd, EV_READ);
871 }
872 else
873 #endif
874 {
875 while (pipe (evpipe))
876 syserr ("(libev) error creating signal/async pipe");
877
878 fd_intern (evpipe [0]);
879 fd_intern (evpipe [1]);
880 ev_io_set (&pipeev, evpipe [0], EV_READ);
881 }
882
883 ev_io_start (EV_A_ &pipeev);
884 ev_unref (EV_A); /* watcher should not keep loop alive */
885 }
886 }
887
888 void inline_size
889 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
890 {
891 if (!*flag)
892 {
893 int old_errno = errno; /* save errno because write might clobber it */
894
895 *flag = 1;
896
897 #if EV_USE_EVENTFD
898 if (evfd >= 0)
899 {
900 uint64_t counter = 1;
901 write (evfd, &counter, sizeof (uint64_t));
902 }
903 else
904 #endif
905 write (evpipe [1], &old_errno, 1);
906
907 errno = old_errno;
908 }
909 }
910
911 static void
912 pipecb (EV_P_ ev_io *iow, int revents)
913 {
914 #if EV_USE_EVENTFD
915 if (evfd >= 0)
916 {
917 uint64_t counter = 1;
918 read (evfd, &counter, sizeof (uint64_t));
919 }
920 else
921 #endif
922 {
923 char dummy;
924 read (evpipe [0], &dummy, 1);
925 }
926
927 if (gotsig && ev_is_default_loop (EV_A))
928 {
929 int signum;
930 gotsig = 0;
931
932 for (signum = signalmax; signum--; )
933 if (signals [signum].gotsig)
934 ev_feed_signal_event (EV_A_ signum + 1);
935 }
936
937 #if EV_ASYNC_ENABLE
938 if (gotasync)
939 {
940 int i;
941 gotasync = 0;
942
943 for (i = asynccnt; i--; )
944 if (asyncs [i]->sent)
945 {
946 asyncs [i]->sent = 0;
947 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
948 }
949 }
950 #endif
951 }
952
953 /*****************************************************************************/
954
955 static void
956 ev_sighandler (int signum)
957 {
958 #if EV_MULTIPLICITY
959 struct ev_loop *loop = &default_loop_struct;
960 #endif
961
962 #if _WIN32
963 signal (signum, ev_sighandler);
964 #endif
965
966 signals [signum - 1].gotsig = 1;
967 evpipe_write (EV_A_ &gotsig);
968 }
969
970 void noinline
971 ev_feed_signal_event (EV_P_ int signum)
972 {
973 WL w;
974
975 #if EV_MULTIPLICITY
976 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
977 #endif
978
979 --signum;
980
981 if (signum < 0 || signum >= signalmax)
982 return;
983
984 signals [signum].gotsig = 0;
985
986 for (w = signals [signum].head; w; w = w->next)
987 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
988 }
989
990 /*****************************************************************************/
991
992 static WL childs [EV_PID_HASHSIZE];
993
994 #ifndef _WIN32
995
996 static ev_signal childev;
997
998 #ifndef WIFCONTINUED
999 # define WIFCONTINUED(status) 0
1000 #endif
1001
1002 void inline_speed
1003 child_reap (EV_P_ int chain, int pid, int status)
1004 {
1005 ev_child *w;
1006 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1007
1008 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1009 {
1010 if ((w->pid == pid || !w->pid)
1011 && (!traced || (w->flags & 1)))
1012 {
1013 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1014 w->rpid = pid;
1015 w->rstatus = status;
1016 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1017 }
1018 }
1019 }
1020
1021 #ifndef WCONTINUED
1022 # define WCONTINUED 0
1023 #endif
1024
1025 static void
1026 childcb (EV_P_ ev_signal *sw, int revents)
1027 {
1028 int pid, status;
1029
1030 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1031 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1032 if (!WCONTINUED
1033 || errno != EINVAL
1034 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1035 return;
1036
1037 /* make sure we are called again until all children have been reaped */
1038 /* we need to do it this way so that the callback gets called before we continue */
1039 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1040
1041 child_reap (EV_A_ pid, pid, status);
1042 if (EV_PID_HASHSIZE > 1)
1043 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1044 }
1045
1046 #endif
1047
1048 /*****************************************************************************/
1049
1050 #if EV_USE_PORT
1051 # include "ev_port.c"
1052 #endif
1053 #if EV_USE_KQUEUE
1054 # include "ev_kqueue.c"
1055 #endif
1056 #if EV_USE_EPOLL
1057 # include "ev_epoll.c"
1058 #endif
1059 #if EV_USE_POLL
1060 # include "ev_poll.c"
1061 #endif
1062 #if EV_USE_SELECT
1063 # include "ev_select.c"
1064 #endif
1065
1066 int
1067 ev_version_major (void)
1068 {
1069 return EV_VERSION_MAJOR;
1070 }
1071
1072 int
1073 ev_version_minor (void)
1074 {
1075 return EV_VERSION_MINOR;
1076 }
1077
1078 /* return true if we are running with elevated privileges and should ignore env variables */
1079 int inline_size
1080 enable_secure (void)
1081 {
1082 #ifdef _WIN32
1083 return 0;
1084 #else
1085 return getuid () != geteuid ()
1086 || getgid () != getegid ();
1087 #endif
1088 }
1089
1090 unsigned int
1091 ev_supported_backends (void)
1092 {
1093 unsigned int flags = 0;
1094
1095 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1096 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1097 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1098 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1099 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1100
1101 return flags;
1102 }
1103
1104 unsigned int
1105 ev_recommended_backends (void)
1106 {
1107 unsigned int flags = ev_supported_backends ();
1108
1109 #ifndef __NetBSD__
1110 /* kqueue is borked on everything but netbsd apparently */
1111 /* it usually doesn't work correctly on anything but sockets and pipes */
1112 flags &= ~EVBACKEND_KQUEUE;
1113 #endif
1114 #ifdef __APPLE__
1115 // flags &= ~EVBACKEND_KQUEUE; for documentation
1116 flags &= ~EVBACKEND_POLL;
1117 #endif
1118
1119 return flags;
1120 }
1121
1122 unsigned int
1123 ev_embeddable_backends (void)
1124 {
1125 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1126
1127 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1128 /* please fix it and tell me how to detect the fix */
1129 flags &= ~EVBACKEND_EPOLL;
1130
1131 return flags;
1132 }
1133
1134 unsigned int
1135 ev_backend (EV_P)
1136 {
1137 return backend;
1138 }
1139
1140 unsigned int
1141 ev_loop_count (EV_P)
1142 {
1143 return loop_count;
1144 }
1145
1146 void
1147 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1148 {
1149 io_blocktime = interval;
1150 }
1151
1152 void
1153 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1154 {
1155 timeout_blocktime = interval;
1156 }
1157
1158 static void noinline
1159 loop_init (EV_P_ unsigned int flags)
1160 {
1161 if (!backend)
1162 {
1163 #if EV_USE_MONOTONIC
1164 {
1165 struct timespec ts;
1166 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1167 have_monotonic = 1;
1168 }
1169 #endif
1170
1171 ev_rt_now = ev_time ();
1172 mn_now = get_clock ();
1173 now_floor = mn_now;
1174 rtmn_diff = ev_rt_now - mn_now;
1175
1176 io_blocktime = 0.;
1177 timeout_blocktime = 0.;
1178 backend = 0;
1179 backend_fd = -1;
1180 gotasync = 0;
1181 #if EV_USE_INOTIFY
1182 fs_fd = -2;
1183 #endif
1184
1185 /* pid check not overridable via env */
1186 #ifndef _WIN32
1187 if (flags & EVFLAG_FORKCHECK)
1188 curpid = getpid ();
1189 #endif
1190
1191 if (!(flags & EVFLAG_NOENV)
1192 && !enable_secure ()
1193 && getenv ("LIBEV_FLAGS"))
1194 flags = atoi (getenv ("LIBEV_FLAGS"));
1195
1196 if (!(flags & 0x0000ffffU))
1197 flags |= ev_recommended_backends ();
1198
1199 #if EV_USE_PORT
1200 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1201 #endif
1202 #if EV_USE_KQUEUE
1203 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1204 #endif
1205 #if EV_USE_EPOLL
1206 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1207 #endif
1208 #if EV_USE_POLL
1209 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1210 #endif
1211 #if EV_USE_SELECT
1212 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1213 #endif
1214
1215 ev_init (&pipeev, pipecb);
1216 ev_set_priority (&pipeev, EV_MAXPRI);
1217 }
1218 }
1219
1220 static void noinline
1221 loop_destroy (EV_P)
1222 {
1223 int i;
1224
1225 if (ev_is_active (&pipeev))
1226 {
1227 ev_ref (EV_A); /* signal watcher */
1228 ev_io_stop (EV_A_ &pipeev);
1229
1230 #if EV_USE_EVENTFD
1231 if (evfd >= 0)
1232 close (evfd);
1233 #endif
1234
1235 if (evpipe [0] >= 0)
1236 {
1237 close (evpipe [0]);
1238 close (evpipe [1]);
1239 }
1240 }
1241
1242 #if EV_USE_INOTIFY
1243 if (fs_fd >= 0)
1244 close (fs_fd);
1245 #endif
1246
1247 if (backend_fd >= 0)
1248 close (backend_fd);
1249
1250 #if EV_USE_PORT
1251 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1252 #endif
1253 #if EV_USE_KQUEUE
1254 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1255 #endif
1256 #if EV_USE_EPOLL
1257 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1258 #endif
1259 #if EV_USE_POLL
1260 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1261 #endif
1262 #if EV_USE_SELECT
1263 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1264 #endif
1265
1266 for (i = NUMPRI; i--; )
1267 {
1268 array_free (pending, [i]);
1269 #if EV_IDLE_ENABLE
1270 array_free (idle, [i]);
1271 #endif
1272 }
1273
1274 ev_free (anfds); anfdmax = 0;
1275
1276 /* have to use the microsoft-never-gets-it-right macro */
1277 array_free (fdchange, EMPTY);
1278 array_free (timer, EMPTY);
1279 #if EV_PERIODIC_ENABLE
1280 array_free (periodic, EMPTY);
1281 #endif
1282 #if EV_FORK_ENABLE
1283 array_free (fork, EMPTY);
1284 #endif
1285 array_free (prepare, EMPTY);
1286 array_free (check, EMPTY);
1287 #if EV_ASYNC_ENABLE
1288 array_free (async, EMPTY);
1289 #endif
1290
1291 backend = 0;
1292 }
1293
1294 #if EV_USE_INOTIFY
1295 void inline_size infy_fork (EV_P);
1296 #endif
1297
1298 void inline_size
1299 loop_fork (EV_P)
1300 {
1301 #if EV_USE_PORT
1302 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1303 #endif
1304 #if EV_USE_KQUEUE
1305 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1306 #endif
1307 #if EV_USE_EPOLL
1308 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1309 #endif
1310 #if EV_USE_INOTIFY
1311 infy_fork (EV_A);
1312 #endif
1313
1314 if (ev_is_active (&pipeev))
1315 {
1316 /* this "locks" the handlers against writing to the pipe */
1317 /* while we modify the fd vars */
1318 gotsig = 1;
1319 #if EV_ASYNC_ENABLE
1320 gotasync = 1;
1321 #endif
1322
1323 ev_ref (EV_A);
1324 ev_io_stop (EV_A_ &pipeev);
1325
1326 #if EV_USE_EVENTFD
1327 if (evfd >= 0)
1328 close (evfd);
1329 #endif
1330
1331 if (evpipe [0] >= 0)
1332 {
1333 close (evpipe [0]);
1334 close (evpipe [1]);
1335 }
1336
1337 evpipe_init (EV_A);
1338 /* now iterate over everything, in case we missed something */
1339 pipecb (EV_A_ &pipeev, EV_READ);
1340 }
1341
1342 postfork = 0;
1343 }
1344
1345 #if EV_MULTIPLICITY
1346 struct ev_loop *
1347 ev_loop_new (unsigned int flags)
1348 {
1349 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1350
1351 memset (loop, 0, sizeof (struct ev_loop));
1352
1353 loop_init (EV_A_ flags);
1354
1355 if (ev_backend (EV_A))
1356 return loop;
1357
1358 return 0;
1359 }
1360
1361 void
1362 ev_loop_destroy (EV_P)
1363 {
1364 loop_destroy (EV_A);
1365 ev_free (loop);
1366 }
1367
1368 void
1369 ev_loop_fork (EV_P)
1370 {
1371 postfork = 1; /* must be in line with ev_default_fork */
1372 }
1373
1374 #endif
1375
1376 #if EV_MULTIPLICITY
1377 struct ev_loop *
1378 ev_default_loop_init (unsigned int flags)
1379 #else
1380 int
1381 ev_default_loop (unsigned int flags)
1382 #endif
1383 {
1384 if (!ev_default_loop_ptr)
1385 {
1386 #if EV_MULTIPLICITY
1387 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1388 #else
1389 ev_default_loop_ptr = 1;
1390 #endif
1391
1392 loop_init (EV_A_ flags);
1393
1394 if (ev_backend (EV_A))
1395 {
1396 #ifndef _WIN32
1397 ev_signal_init (&childev, childcb, SIGCHLD);
1398 ev_set_priority (&childev, EV_MAXPRI);
1399 ev_signal_start (EV_A_ &childev);
1400 ev_unref (EV_A); /* child watcher should not keep loop alive */
1401 #endif
1402 }
1403 else
1404 ev_default_loop_ptr = 0;
1405 }
1406
1407 return ev_default_loop_ptr;
1408 }
1409
1410 void
1411 ev_default_destroy (void)
1412 {
1413 #if EV_MULTIPLICITY
1414 struct ev_loop *loop = ev_default_loop_ptr;
1415 #endif
1416
1417 #ifndef _WIN32
1418 ev_ref (EV_A); /* child watcher */
1419 ev_signal_stop (EV_A_ &childev);
1420 #endif
1421
1422 loop_destroy (EV_A);
1423 }
1424
1425 void
1426 ev_default_fork (void)
1427 {
1428 #if EV_MULTIPLICITY
1429 struct ev_loop *loop = ev_default_loop_ptr;
1430 #endif
1431
1432 if (backend)
1433 postfork = 1; /* must be in line with ev_loop_fork */
1434 }
1435
1436 /*****************************************************************************/
1437
1438 void
1439 ev_invoke (EV_P_ void *w, int revents)
1440 {
1441 EV_CB_INVOKE ((W)w, revents);
1442 }
1443
1444 void inline_speed
1445 call_pending (EV_P)
1446 {
1447 int pri;
1448
1449 for (pri = NUMPRI; pri--; )
1450 while (pendingcnt [pri])
1451 {
1452 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1453
1454 if (expect_true (p->w))
1455 {
1456 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1457
1458 p->w->pending = 0;
1459 EV_CB_INVOKE (p->w, p->events);
1460 }
1461 }
1462 }
1463
1464 void inline_size
1465 timers_reify (EV_P)
1466 {
1467 while (timercnt && ev_at (timers [1]) <= mn_now)
1468 {
1469 ev_timer *w = (ev_timer *)timers [1];
1470
1471 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1472
1473 /* first reschedule or stop timer */
1474 if (w->repeat)
1475 {
1476 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1477
1478 ev_at (w) += w->repeat;
1479 if (ev_at (w) < mn_now)
1480 ev_at (w) = mn_now;
1481
1482 downheap (timers, timercnt, 1);
1483 }
1484 else
1485 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1486
1487 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1488 }
1489 }
1490
1491 #if EV_PERIODIC_ENABLE
1492 void inline_size
1493 periodics_reify (EV_P)
1494 {
1495 while (periodiccnt && ev_at (periodics [1]) <= ev_rt_now)
1496 {
1497 ev_periodic *w = (ev_periodic *)periodics [1];
1498
1499 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1500
1501 /* first reschedule or stop timer */
1502 if (w->reschedule_cb)
1503 {
1504 ev_at (w) = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1505 assert (("ev_periodic reschedule callback returned time in the past", ev_at (w) > ev_rt_now));
1506 downheap (periodics, periodiccnt, 1);
1507 }
1508 else if (w->interval)
1509 {
1510 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1511 if (ev_at (w) - ev_rt_now <= TIME_EPSILON) ev_at (w) += w->interval;
1512 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ev_at (w) > ev_rt_now));
1513 downheap (periodics, periodiccnt, 1);
1514 }
1515 else
1516 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1517
1518 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1519 }
1520 }
1521
1522 static void noinline
1523 periodics_reschedule (EV_P)
1524 {
1525 int i;
1526
1527 /* adjust periodics after time jump */
1528 for (i = 1; i <= periodiccnt; ++i)
1529 {
1530 ev_periodic *w = (ev_periodic *)periodics [i];
1531
1532 if (w->reschedule_cb)
1533 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1534 else if (w->interval)
1535 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1536 }
1537
1538 /* now rebuild the heap */
1539 for (i = periodiccnt >> 1; i--; )
1540 downheap (periodics, periodiccnt, i);
1541 }
1542 #endif
1543
1544 #if EV_IDLE_ENABLE
1545 void inline_size
1546 idle_reify (EV_P)
1547 {
1548 if (expect_false (idleall))
1549 {
1550 int pri;
1551
1552 for (pri = NUMPRI; pri--; )
1553 {
1554 if (pendingcnt [pri])
1555 break;
1556
1557 if (idlecnt [pri])
1558 {
1559 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1560 break;
1561 }
1562 }
1563 }
1564 }
1565 #endif
1566
1567 void inline_speed
1568 time_update (EV_P_ ev_tstamp max_block)
1569 {
1570 int i;
1571
1572 #if EV_USE_MONOTONIC
1573 if (expect_true (have_monotonic))
1574 {
1575 ev_tstamp odiff = rtmn_diff;
1576
1577 mn_now = get_clock ();
1578
1579 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1580 /* interpolate in the meantime */
1581 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1582 {
1583 ev_rt_now = rtmn_diff + mn_now;
1584 return;
1585 }
1586
1587 now_floor = mn_now;
1588 ev_rt_now = ev_time ();
1589
1590 /* loop a few times, before making important decisions.
1591 * on the choice of "4": one iteration isn't enough,
1592 * in case we get preempted during the calls to
1593 * ev_time and get_clock. a second call is almost guaranteed
1594 * to succeed in that case, though. and looping a few more times
1595 * doesn't hurt either as we only do this on time-jumps or
1596 * in the unlikely event of having been preempted here.
1597 */
1598 for (i = 4; --i; )
1599 {
1600 rtmn_diff = ev_rt_now - mn_now;
1601
1602 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1603 return; /* all is well */
1604
1605 ev_rt_now = ev_time ();
1606 mn_now = get_clock ();
1607 now_floor = mn_now;
1608 }
1609
1610 # if EV_PERIODIC_ENABLE
1611 periodics_reschedule (EV_A);
1612 # endif
1613 /* no timer adjustment, as the monotonic clock doesn't jump */
1614 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1615 }
1616 else
1617 #endif
1618 {
1619 ev_rt_now = ev_time ();
1620
1621 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1622 {
1623 #if EV_PERIODIC_ENABLE
1624 periodics_reschedule (EV_A);
1625 #endif
1626 /* adjust timers. this is easy, as the offset is the same for all of them */
1627 for (i = 1; i <= timercnt; ++i)
1628 ev_at (timers [i]) += ev_rt_now - mn_now;
1629 }
1630
1631 mn_now = ev_rt_now;
1632 }
1633 }
1634
1635 void
1636 ev_ref (EV_P)
1637 {
1638 ++activecnt;
1639 }
1640
1641 void
1642 ev_unref (EV_P)
1643 {
1644 --activecnt;
1645 }
1646
1647 static int loop_done;
1648
1649 void
1650 ev_loop (EV_P_ int flags)
1651 {
1652 loop_done = EVUNLOOP_CANCEL;
1653
1654 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1655
1656 do
1657 {
1658 #ifndef _WIN32
1659 if (expect_false (curpid)) /* penalise the forking check even more */
1660 if (expect_false (getpid () != curpid))
1661 {
1662 curpid = getpid ();
1663 postfork = 1;
1664 }
1665 #endif
1666
1667 #if EV_FORK_ENABLE
1668 /* we might have forked, so queue fork handlers */
1669 if (expect_false (postfork))
1670 if (forkcnt)
1671 {
1672 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1673 call_pending (EV_A);
1674 }
1675 #endif
1676
1677 /* queue prepare watchers (and execute them) */
1678 if (expect_false (preparecnt))
1679 {
1680 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1681 call_pending (EV_A);
1682 }
1683
1684 if (expect_false (!activecnt))
1685 break;
1686
1687 /* we might have forked, so reify kernel state if necessary */
1688 if (expect_false (postfork))
1689 loop_fork (EV_A);
1690
1691 /* update fd-related kernel structures */
1692 fd_reify (EV_A);
1693
1694 /* calculate blocking time */
1695 {
1696 ev_tstamp waittime = 0.;
1697 ev_tstamp sleeptime = 0.;
1698
1699 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1700 {
1701 /* update time to cancel out callback processing overhead */
1702 time_update (EV_A_ 1e100);
1703
1704 waittime = MAX_BLOCKTIME;
1705
1706 if (timercnt)
1707 {
1708 ev_tstamp to = ev_at (timers [1]) - mn_now + backend_fudge;
1709 if (waittime > to) waittime = to;
1710 }
1711
1712 #if EV_PERIODIC_ENABLE
1713 if (periodiccnt)
1714 {
1715 ev_tstamp to = ev_at (periodics [1]) - ev_rt_now + backend_fudge;
1716 if (waittime > to) waittime = to;
1717 }
1718 #endif
1719
1720 if (expect_false (waittime < timeout_blocktime))
1721 waittime = timeout_blocktime;
1722
1723 sleeptime = waittime - backend_fudge;
1724
1725 if (expect_true (sleeptime > io_blocktime))
1726 sleeptime = io_blocktime;
1727
1728 if (sleeptime)
1729 {
1730 ev_sleep (sleeptime);
1731 waittime -= sleeptime;
1732 }
1733 }
1734
1735 ++loop_count;
1736 backend_poll (EV_A_ waittime);
1737
1738 /* update ev_rt_now, do magic */
1739 time_update (EV_A_ waittime + sleeptime);
1740 }
1741
1742 /* queue pending timers and reschedule them */
1743 timers_reify (EV_A); /* relative timers called last */
1744 #if EV_PERIODIC_ENABLE
1745 periodics_reify (EV_A); /* absolute timers called first */
1746 #endif
1747
1748 #if EV_IDLE_ENABLE
1749 /* queue idle watchers unless other events are pending */
1750 idle_reify (EV_A);
1751 #endif
1752
1753 /* queue check watchers, to be executed first */
1754 if (expect_false (checkcnt))
1755 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1756
1757 call_pending (EV_A);
1758 }
1759 while (expect_true (
1760 activecnt
1761 && !loop_done
1762 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
1763 ));
1764
1765 if (loop_done == EVUNLOOP_ONE)
1766 loop_done = EVUNLOOP_CANCEL;
1767 }
1768
1769 void
1770 ev_unloop (EV_P_ int how)
1771 {
1772 loop_done = how;
1773 }
1774
1775 /*****************************************************************************/
1776
1777 void inline_size
1778 wlist_add (WL *head, WL elem)
1779 {
1780 elem->next = *head;
1781 *head = elem;
1782 }
1783
1784 void inline_size
1785 wlist_del (WL *head, WL elem)
1786 {
1787 while (*head)
1788 {
1789 if (*head == elem)
1790 {
1791 *head = elem->next;
1792 return;
1793 }
1794
1795 head = &(*head)->next;
1796 }
1797 }
1798
1799 void inline_speed
1800 clear_pending (EV_P_ W w)
1801 {
1802 if (w->pending)
1803 {
1804 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1805 w->pending = 0;
1806 }
1807 }
1808
1809 int
1810 ev_clear_pending (EV_P_ void *w)
1811 {
1812 W w_ = (W)w;
1813 int pending = w_->pending;
1814
1815 if (expect_true (pending))
1816 {
1817 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1818 w_->pending = 0;
1819 p->w = 0;
1820 return p->events;
1821 }
1822 else
1823 return 0;
1824 }
1825
1826 void inline_size
1827 pri_adjust (EV_P_ W w)
1828 {
1829 int pri = w->priority;
1830 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1831 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1832 w->priority = pri;
1833 }
1834
1835 void inline_speed
1836 ev_start (EV_P_ W w, int active)
1837 {
1838 pri_adjust (EV_A_ w);
1839 w->active = active;
1840 ev_ref (EV_A);
1841 }
1842
1843 void inline_size
1844 ev_stop (EV_P_ W w)
1845 {
1846 ev_unref (EV_A);
1847 w->active = 0;
1848 }
1849
1850 /*****************************************************************************/
1851
1852 void noinline
1853 ev_io_start (EV_P_ ev_io *w)
1854 {
1855 int fd = w->fd;
1856
1857 if (expect_false (ev_is_active (w)))
1858 return;
1859
1860 assert (("ev_io_start called with negative fd", fd >= 0));
1861
1862 ev_start (EV_A_ (W)w, 1);
1863 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1864 wlist_add (&anfds[fd].head, (WL)w);
1865
1866 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1867 w->events &= ~EV_IOFDSET;
1868 }
1869
1870 void noinline
1871 ev_io_stop (EV_P_ ev_io *w)
1872 {
1873 clear_pending (EV_A_ (W)w);
1874 if (expect_false (!ev_is_active (w)))
1875 return;
1876
1877 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1878
1879 wlist_del (&anfds[w->fd].head, (WL)w);
1880 ev_stop (EV_A_ (W)w);
1881
1882 fd_change (EV_A_ w->fd, 1);
1883 }
1884
1885 void noinline
1886 ev_timer_start (EV_P_ ev_timer *w)
1887 {
1888 if (expect_false (ev_is_active (w)))
1889 return;
1890
1891 ev_at (w) += mn_now;
1892
1893 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1894
1895 ev_start (EV_A_ (W)w, ++timercnt);
1896 array_needsize (WT, timers, timermax, timercnt + 1, EMPTY2);
1897 timers [timercnt] = (WT)w;
1898 upheap (timers, timercnt);
1899
1900 /*assert (("internal timer heap corruption", timers [ev_active (w)] == w));*/
1901 }
1902
1903 void noinline
1904 ev_timer_stop (EV_P_ ev_timer *w)
1905 {
1906 clear_pending (EV_A_ (W)w);
1907 if (expect_false (!ev_is_active (w)))
1908 return;
1909
1910 {
1911 int active = ev_active (w);
1912
1913 assert (("internal timer heap corruption", timers [active] == (WT)w));
1914
1915 if (expect_true (active < timercnt))
1916 {
1917 timers [active] = timers [timercnt];
1918 adjustheap (timers, timercnt, active);
1919 }
1920
1921 --timercnt;
1922 }
1923
1924 ev_at (w) -= mn_now;
1925
1926 ev_stop (EV_A_ (W)w);
1927 }
1928
1929 void noinline
1930 ev_timer_again (EV_P_ ev_timer *w)
1931 {
1932 if (ev_is_active (w))
1933 {
1934 if (w->repeat)
1935 {
1936 ev_at (w) = mn_now + w->repeat;
1937 adjustheap (timers, timercnt, ev_active (w));
1938 }
1939 else
1940 ev_timer_stop (EV_A_ w);
1941 }
1942 else if (w->repeat)
1943 {
1944 ev_at (w) = w->repeat;
1945 ev_timer_start (EV_A_ w);
1946 }
1947 }
1948
1949 #if EV_PERIODIC_ENABLE
1950 void noinline
1951 ev_periodic_start (EV_P_ ev_periodic *w)
1952 {
1953 if (expect_false (ev_is_active (w)))
1954 return;
1955
1956 if (w->reschedule_cb)
1957 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1958 else if (w->interval)
1959 {
1960 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1961 /* this formula differs from the one in periodic_reify because we do not always round up */
1962 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1963 }
1964 else
1965 ev_at (w) = w->offset;
1966
1967 ev_start (EV_A_ (W)w, ++periodiccnt);
1968 array_needsize (WT, periodics, periodicmax, periodiccnt + 1, EMPTY2);
1969 periodics [periodiccnt] = (WT)w;
1970 upheap (periodics, periodiccnt);
1971
1972 /*assert (("internal periodic heap corruption", periodics [ev_active (w)] == w));*/
1973 }
1974
1975 void noinline
1976 ev_periodic_stop (EV_P_ ev_periodic *w)
1977 {
1978 clear_pending (EV_A_ (W)w);
1979 if (expect_false (!ev_is_active (w)))
1980 return;
1981
1982 {
1983 int active = ev_active (w);
1984
1985 assert (("internal periodic heap corruption", periodics [active] == (WT)w));
1986
1987 if (expect_true (active < periodiccnt))
1988 {
1989 periodics [active] = periodics [periodiccnt];
1990 adjustheap (periodics, periodiccnt, active);
1991 }
1992
1993 --periodiccnt;
1994 }
1995
1996 ev_stop (EV_A_ (W)w);
1997 }
1998
1999 void noinline
2000 ev_periodic_again (EV_P_ ev_periodic *w)
2001 {
2002 /* TODO: use adjustheap and recalculation */
2003 ev_periodic_stop (EV_A_ w);
2004 ev_periodic_start (EV_A_ w);
2005 }
2006 #endif
2007
2008 #ifndef SA_RESTART
2009 # define SA_RESTART 0
2010 #endif
2011
2012 void noinline
2013 ev_signal_start (EV_P_ ev_signal *w)
2014 {
2015 #if EV_MULTIPLICITY
2016 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2017 #endif
2018 if (expect_false (ev_is_active (w)))
2019 return;
2020
2021 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2022
2023 evpipe_init (EV_A);
2024
2025 {
2026 #ifndef _WIN32
2027 sigset_t full, prev;
2028 sigfillset (&full);
2029 sigprocmask (SIG_SETMASK, &full, &prev);
2030 #endif
2031
2032 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2033
2034 #ifndef _WIN32
2035 sigprocmask (SIG_SETMASK, &prev, 0);
2036 #endif
2037 }
2038
2039 ev_start (EV_A_ (W)w, 1);
2040 wlist_add (&signals [w->signum - 1].head, (WL)w);
2041
2042 if (!((WL)w)->next)
2043 {
2044 #if _WIN32
2045 signal (w->signum, ev_sighandler);
2046 #else
2047 struct sigaction sa;
2048 sa.sa_handler = ev_sighandler;
2049 sigfillset (&sa.sa_mask);
2050 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2051 sigaction (w->signum, &sa, 0);
2052 #endif
2053 }
2054 }
2055
2056 void noinline
2057 ev_signal_stop (EV_P_ ev_signal *w)
2058 {
2059 clear_pending (EV_A_ (W)w);
2060 if (expect_false (!ev_is_active (w)))
2061 return;
2062
2063 wlist_del (&signals [w->signum - 1].head, (WL)w);
2064 ev_stop (EV_A_ (W)w);
2065
2066 if (!signals [w->signum - 1].head)
2067 signal (w->signum, SIG_DFL);
2068 }
2069
2070 void
2071 ev_child_start (EV_P_ ev_child *w)
2072 {
2073 #if EV_MULTIPLICITY
2074 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2075 #endif
2076 if (expect_false (ev_is_active (w)))
2077 return;
2078
2079 ev_start (EV_A_ (W)w, 1);
2080 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2081 }
2082
2083 void
2084 ev_child_stop (EV_P_ ev_child *w)
2085 {
2086 clear_pending (EV_A_ (W)w);
2087 if (expect_false (!ev_is_active (w)))
2088 return;
2089
2090 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2091 ev_stop (EV_A_ (W)w);
2092 }
2093
2094 #if EV_STAT_ENABLE
2095
2096 # ifdef _WIN32
2097 # undef lstat
2098 # define lstat(a,b) _stati64 (a,b)
2099 # endif
2100
2101 #define DEF_STAT_INTERVAL 5.0074891
2102 #define MIN_STAT_INTERVAL 0.1074891
2103
2104 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2105
2106 #if EV_USE_INOTIFY
2107 # define EV_INOTIFY_BUFSIZE 8192
2108
2109 static void noinline
2110 infy_add (EV_P_ ev_stat *w)
2111 {
2112 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);
2113
2114 if (w->wd < 0)
2115 {
2116 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2117
2118 /* monitor some parent directory for speedup hints */
2119 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2120 {
2121 char path [4096];
2122 strcpy (path, w->path);
2123
2124 do
2125 {
2126 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2127 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2128
2129 char *pend = strrchr (path, '/');
2130
2131 if (!pend)
2132 break; /* whoops, no '/', complain to your admin */
2133
2134 *pend = 0;
2135 w->wd = inotify_add_watch (fs_fd, path, mask);
2136 }
2137 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2138 }
2139 }
2140 else
2141 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2142
2143 if (w->wd >= 0)
2144 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2145 }
2146
2147 static void noinline
2148 infy_del (EV_P_ ev_stat *w)
2149 {
2150 int slot;
2151 int wd = w->wd;
2152
2153 if (wd < 0)
2154 return;
2155
2156 w->wd = -2;
2157 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2158 wlist_del (&fs_hash [slot].head, (WL)w);
2159
2160 /* remove this watcher, if others are watching it, they will rearm */
2161 inotify_rm_watch (fs_fd, wd);
2162 }
2163
2164 static void noinline
2165 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2166 {
2167 if (slot < 0)
2168 /* overflow, need to check for all hahs slots */
2169 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2170 infy_wd (EV_A_ slot, wd, ev);
2171 else
2172 {
2173 WL w_;
2174
2175 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2176 {
2177 ev_stat *w = (ev_stat *)w_;
2178 w_ = w_->next; /* lets us remove this watcher and all before it */
2179
2180 if (w->wd == wd || wd == -1)
2181 {
2182 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2183 {
2184 w->wd = -1;
2185 infy_add (EV_A_ w); /* re-add, no matter what */
2186 }
2187
2188 stat_timer_cb (EV_A_ &w->timer, 0);
2189 }
2190 }
2191 }
2192 }
2193
2194 static void
2195 infy_cb (EV_P_ ev_io *w, int revents)
2196 {
2197 char buf [EV_INOTIFY_BUFSIZE];
2198 struct inotify_event *ev = (struct inotify_event *)buf;
2199 int ofs;
2200 int len = read (fs_fd, buf, sizeof (buf));
2201
2202 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2203 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2204 }
2205
2206 void inline_size
2207 infy_init (EV_P)
2208 {
2209 if (fs_fd != -2)
2210 return;
2211
2212 fs_fd = inotify_init ();
2213
2214 if (fs_fd >= 0)
2215 {
2216 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2217 ev_set_priority (&fs_w, EV_MAXPRI);
2218 ev_io_start (EV_A_ &fs_w);
2219 }
2220 }
2221
2222 void inline_size
2223 infy_fork (EV_P)
2224 {
2225 int slot;
2226
2227 if (fs_fd < 0)
2228 return;
2229
2230 close (fs_fd);
2231 fs_fd = inotify_init ();
2232
2233 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2234 {
2235 WL w_ = fs_hash [slot].head;
2236 fs_hash [slot].head = 0;
2237
2238 while (w_)
2239 {
2240 ev_stat *w = (ev_stat *)w_;
2241 w_ = w_->next; /* lets us add this watcher */
2242
2243 w->wd = -1;
2244
2245 if (fs_fd >= 0)
2246 infy_add (EV_A_ w); /* re-add, no matter what */
2247 else
2248 ev_timer_start (EV_A_ &w->timer);
2249 }
2250
2251 }
2252 }
2253
2254 #endif
2255
2256 void
2257 ev_stat_stat (EV_P_ ev_stat *w)
2258 {
2259 if (lstat (w->path, &w->attr) < 0)
2260 w->attr.st_nlink = 0;
2261 else if (!w->attr.st_nlink)
2262 w->attr.st_nlink = 1;
2263 }
2264
2265 static void noinline
2266 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2267 {
2268 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2269
2270 /* we copy this here each the time so that */
2271 /* prev has the old value when the callback gets invoked */
2272 w->prev = w->attr;
2273 ev_stat_stat (EV_A_ w);
2274
2275 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2276 if (
2277 w->prev.st_dev != w->attr.st_dev
2278 || w->prev.st_ino != w->attr.st_ino
2279 || w->prev.st_mode != w->attr.st_mode
2280 || w->prev.st_nlink != w->attr.st_nlink
2281 || w->prev.st_uid != w->attr.st_uid
2282 || w->prev.st_gid != w->attr.st_gid
2283 || w->prev.st_rdev != w->attr.st_rdev
2284 || w->prev.st_size != w->attr.st_size
2285 || w->prev.st_atime != w->attr.st_atime
2286 || w->prev.st_mtime != w->attr.st_mtime
2287 || w->prev.st_ctime != w->attr.st_ctime
2288 ) {
2289 #if EV_USE_INOTIFY
2290 infy_del (EV_A_ w);
2291 infy_add (EV_A_ w);
2292 ev_stat_stat (EV_A_ w); /* avoid race... */
2293 #endif
2294
2295 ev_feed_event (EV_A_ w, EV_STAT);
2296 }
2297 }
2298
2299 void
2300 ev_stat_start (EV_P_ ev_stat *w)
2301 {
2302 if (expect_false (ev_is_active (w)))
2303 return;
2304
2305 /* since we use memcmp, we need to clear any padding data etc. */
2306 memset (&w->prev, 0, sizeof (ev_statdata));
2307 memset (&w->attr, 0, sizeof (ev_statdata));
2308
2309 ev_stat_stat (EV_A_ w);
2310
2311 if (w->interval < MIN_STAT_INTERVAL)
2312 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2313
2314 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2315 ev_set_priority (&w->timer, ev_priority (w));
2316
2317 #if EV_USE_INOTIFY
2318 infy_init (EV_A);
2319
2320 if (fs_fd >= 0)
2321 infy_add (EV_A_ w);
2322 else
2323 #endif
2324 ev_timer_start (EV_A_ &w->timer);
2325
2326 ev_start (EV_A_ (W)w, 1);
2327 }
2328
2329 void
2330 ev_stat_stop (EV_P_ ev_stat *w)
2331 {
2332 clear_pending (EV_A_ (W)w);
2333 if (expect_false (!ev_is_active (w)))
2334 return;
2335
2336 #if EV_USE_INOTIFY
2337 infy_del (EV_A_ w);
2338 #endif
2339 ev_timer_stop (EV_A_ &w->timer);
2340
2341 ev_stop (EV_A_ (W)w);
2342 }
2343 #endif
2344
2345 #if EV_IDLE_ENABLE
2346 void
2347 ev_idle_start (EV_P_ ev_idle *w)
2348 {
2349 if (expect_false (ev_is_active (w)))
2350 return;
2351
2352 pri_adjust (EV_A_ (W)w);
2353
2354 {
2355 int active = ++idlecnt [ABSPRI (w)];
2356
2357 ++idleall;
2358 ev_start (EV_A_ (W)w, active);
2359
2360 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2361 idles [ABSPRI (w)][active - 1] = w;
2362 }
2363 }
2364
2365 void
2366 ev_idle_stop (EV_P_ ev_idle *w)
2367 {
2368 clear_pending (EV_A_ (W)w);
2369 if (expect_false (!ev_is_active (w)))
2370 return;
2371
2372 {
2373 int active = ev_active (w);
2374
2375 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2376 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2377
2378 ev_stop (EV_A_ (W)w);
2379 --idleall;
2380 }
2381 }
2382 #endif
2383
2384 void
2385 ev_prepare_start (EV_P_ ev_prepare *w)
2386 {
2387 if (expect_false (ev_is_active (w)))
2388 return;
2389
2390 ev_start (EV_A_ (W)w, ++preparecnt);
2391 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2392 prepares [preparecnt - 1] = w;
2393 }
2394
2395 void
2396 ev_prepare_stop (EV_P_ ev_prepare *w)
2397 {
2398 clear_pending (EV_A_ (W)w);
2399 if (expect_false (!ev_is_active (w)))
2400 return;
2401
2402 {
2403 int active = ev_active (w);
2404
2405 prepares [active - 1] = prepares [--preparecnt];
2406 ev_active (prepares [active - 1]) = active;
2407 }
2408
2409 ev_stop (EV_A_ (W)w);
2410 }
2411
2412 void
2413 ev_check_start (EV_P_ ev_check *w)
2414 {
2415 if (expect_false (ev_is_active (w)))
2416 return;
2417
2418 ev_start (EV_A_ (W)w, ++checkcnt);
2419 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2420 checks [checkcnt - 1] = w;
2421 }
2422
2423 void
2424 ev_check_stop (EV_P_ ev_check *w)
2425 {
2426 clear_pending (EV_A_ (W)w);
2427 if (expect_false (!ev_is_active (w)))
2428 return;
2429
2430 {
2431 int active = ev_active (w);
2432
2433 checks [active - 1] = checks [--checkcnt];
2434 ev_active (checks [active - 1]) = active;
2435 }
2436
2437 ev_stop (EV_A_ (W)w);
2438 }
2439
2440 #if EV_EMBED_ENABLE
2441 void noinline
2442 ev_embed_sweep (EV_P_ ev_embed *w)
2443 {
2444 ev_loop (w->other, EVLOOP_NONBLOCK);
2445 }
2446
2447 static void
2448 embed_io_cb (EV_P_ ev_io *io, int revents)
2449 {
2450 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2451
2452 if (ev_cb (w))
2453 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2454 else
2455 ev_loop (w->other, EVLOOP_NONBLOCK);
2456 }
2457
2458 static void
2459 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2460 {
2461 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2462
2463 {
2464 struct ev_loop *loop = w->other;
2465
2466 while (fdchangecnt)
2467 {
2468 fd_reify (EV_A);
2469 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2470 }
2471 }
2472 }
2473
2474 #if 0
2475 static void
2476 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2477 {
2478 ev_idle_stop (EV_A_ idle);
2479 }
2480 #endif
2481
2482 void
2483 ev_embed_start (EV_P_ ev_embed *w)
2484 {
2485 if (expect_false (ev_is_active (w)))
2486 return;
2487
2488 {
2489 struct ev_loop *loop = w->other;
2490 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2491 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2492 }
2493
2494 ev_set_priority (&w->io, ev_priority (w));
2495 ev_io_start (EV_A_ &w->io);
2496
2497 ev_prepare_init (&w->prepare, embed_prepare_cb);
2498 ev_set_priority (&w->prepare, EV_MINPRI);
2499 ev_prepare_start (EV_A_ &w->prepare);
2500
2501 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2502
2503 ev_start (EV_A_ (W)w, 1);
2504 }
2505
2506 void
2507 ev_embed_stop (EV_P_ ev_embed *w)
2508 {
2509 clear_pending (EV_A_ (W)w);
2510 if (expect_false (!ev_is_active (w)))
2511 return;
2512
2513 ev_io_stop (EV_A_ &w->io);
2514 ev_prepare_stop (EV_A_ &w->prepare);
2515
2516 ev_stop (EV_A_ (W)w);
2517 }
2518 #endif
2519
2520 #if EV_FORK_ENABLE
2521 void
2522 ev_fork_start (EV_P_ ev_fork *w)
2523 {
2524 if (expect_false (ev_is_active (w)))
2525 return;
2526
2527 ev_start (EV_A_ (W)w, ++forkcnt);
2528 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2529 forks [forkcnt - 1] = w;
2530 }
2531
2532 void
2533 ev_fork_stop (EV_P_ ev_fork *w)
2534 {
2535 clear_pending (EV_A_ (W)w);
2536 if (expect_false (!ev_is_active (w)))
2537 return;
2538
2539 {
2540 int active = ev_active (w);
2541
2542 forks [active - 1] = forks [--forkcnt];
2543 ev_active (forks [active - 1]) = active;
2544 }
2545
2546 ev_stop (EV_A_ (W)w);
2547 }
2548 #endif
2549
2550 #if EV_ASYNC_ENABLE
2551 void
2552 ev_async_start (EV_P_ ev_async *w)
2553 {
2554 if (expect_false (ev_is_active (w)))
2555 return;
2556
2557 evpipe_init (EV_A);
2558
2559 ev_start (EV_A_ (W)w, ++asynccnt);
2560 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2561 asyncs [asynccnt - 1] = w;
2562 }
2563
2564 void
2565 ev_async_stop (EV_P_ ev_async *w)
2566 {
2567 clear_pending (EV_A_ (W)w);
2568 if (expect_false (!ev_is_active (w)))
2569 return;
2570
2571 {
2572 int active = ev_active (w);
2573
2574 asyncs [active - 1] = asyncs [--asynccnt];
2575 ev_active (asyncs [active - 1]) = active;
2576 }
2577
2578 ev_stop (EV_A_ (W)w);
2579 }
2580
2581 void
2582 ev_async_send (EV_P_ ev_async *w)
2583 {
2584 w->sent = 1;
2585 evpipe_write (EV_A_ &gotasync);
2586 }
2587 #endif
2588
2589 /*****************************************************************************/
2590
2591 struct ev_once
2592 {
2593 ev_io io;
2594 ev_timer to;
2595 void (*cb)(int revents, void *arg);
2596 void *arg;
2597 };
2598
2599 static void
2600 once_cb (EV_P_ struct ev_once *once, int revents)
2601 {
2602 void (*cb)(int revents, void *arg) = once->cb;
2603 void *arg = once->arg;
2604
2605 ev_io_stop (EV_A_ &once->io);
2606 ev_timer_stop (EV_A_ &once->to);
2607 ev_free (once);
2608
2609 cb (revents, arg);
2610 }
2611
2612 static void
2613 once_cb_io (EV_P_ ev_io *w, int revents)
2614 {
2615 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2616 }
2617
2618 static void
2619 once_cb_to (EV_P_ ev_timer *w, int revents)
2620 {
2621 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2622 }
2623
2624 void
2625 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2626 {
2627 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2628
2629 if (expect_false (!once))
2630 {
2631 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2632 return;
2633 }
2634
2635 once->cb = cb;
2636 once->arg = arg;
2637
2638 ev_init (&once->io, once_cb_io);
2639 if (fd >= 0)
2640 {
2641 ev_io_set (&once->io, fd, events);
2642 ev_io_start (EV_A_ &once->io);
2643 }
2644
2645 ev_init (&once->to, once_cb_to);
2646 if (timeout >= 0.)
2647 {
2648 ev_timer_set (&once->to, timeout, 0.);
2649 ev_timer_start (EV_A_ &once->to);
2650 }
2651 }
2652
2653 #if EV_MULTIPLICITY
2654 #include "ev_wrap.h"
2655 #endif
2656
2657 #ifdef __cplusplus
2658 }
2659 #endif
2660