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Revision: 1.224
Committed: Wed Apr 9 22:07:50 2008 UTC (16 years, 3 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.223: +17 -2 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 /* this big block deduces configuration from config.h */
45 #ifndef EV_STANDALONE
46 # ifdef EV_CONFIG_H
47 # include EV_CONFIG_H
48 # else
49 # include "config.h"
50 # endif
51
52 # if HAVE_CLOCK_GETTIME
53 # ifndef EV_USE_MONOTONIC
54 # define EV_USE_MONOTONIC 1
55 # endif
56 # ifndef EV_USE_REALTIME
57 # define EV_USE_REALTIME 1
58 # endif
59 # else
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 0
62 # endif
63 # ifndef EV_USE_REALTIME
64 # define EV_USE_REALTIME 0
65 # endif
66 # endif
67
68 # ifndef EV_USE_NANOSLEEP
69 # if HAVE_NANOSLEEP
70 # define EV_USE_NANOSLEEP 1
71 # else
72 # define EV_USE_NANOSLEEP 0
73 # endif
74 # endif
75
76 # ifndef EV_USE_SELECT
77 # if HAVE_SELECT && HAVE_SYS_SELECT_H
78 # define EV_USE_SELECT 1
79 # else
80 # define EV_USE_SELECT 0
81 # endif
82 # endif
83
84 # ifndef EV_USE_POLL
85 # if HAVE_POLL && HAVE_POLL_H
86 # define EV_USE_POLL 1
87 # else
88 # define EV_USE_POLL 0
89 # endif
90 # endif
91
92 # ifndef EV_USE_EPOLL
93 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
94 # define EV_USE_EPOLL 1
95 # else
96 # define EV_USE_EPOLL 0
97 # endif
98 # endif
99
100 # ifndef EV_USE_KQUEUE
101 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
102 # define EV_USE_KQUEUE 1
103 # else
104 # define EV_USE_KQUEUE 0
105 # endif
106 # endif
107
108 # ifndef EV_USE_PORT
109 # if HAVE_PORT_H && HAVE_PORT_CREATE
110 # define EV_USE_PORT 1
111 # else
112 # define EV_USE_PORT 0
113 # endif
114 # endif
115
116 # ifndef EV_USE_INOTIFY
117 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
118 # define EV_USE_INOTIFY 1
119 # else
120 # define EV_USE_INOTIFY 0
121 # endif
122 # endif
123
124 # ifndef EV_USE_EVENTFD
125 # if HAVE_EVENTFD
126 # define EV_USE_EVENTFD 1
127 # else
128 # define EV_USE_EVENTFD 0
129 # endif
130 # endif
131
132 #endif
133
134 #include <math.h>
135 #include <stdlib.h>
136 #include <fcntl.h>
137 #include <stddef.h>
138
139 #include <stdio.h>
140
141 #include <assert.h>
142 #include <errno.h>
143 #include <sys/types.h>
144 #include <time.h>
145
146 #include <signal.h>
147
148 #ifdef EV_H
149 # include EV_H
150 #else
151 # include "ev.h"
152 #endif
153
154 #ifndef _WIN32
155 # include <sys/time.h>
156 # include <sys/wait.h>
157 # include <unistd.h>
158 #else
159 # define WIN32_LEAN_AND_MEAN
160 # include <windows.h>
161 # ifndef EV_SELECT_IS_WINSOCKET
162 # define EV_SELECT_IS_WINSOCKET 1
163 # endif
164 #endif
165
166 /* this block tries to deduce configuration from header-defined symbols and defaults */
167
168 #ifndef EV_USE_MONOTONIC
169 # define EV_USE_MONOTONIC 0
170 #endif
171
172 #ifndef EV_USE_REALTIME
173 # define EV_USE_REALTIME 0
174 #endif
175
176 #ifndef EV_USE_NANOSLEEP
177 # define EV_USE_NANOSLEEP 0
178 #endif
179
180 #ifndef EV_USE_SELECT
181 # define EV_USE_SELECT 1
182 #endif
183
184 #ifndef EV_USE_POLL
185 # ifdef _WIN32
186 # define EV_USE_POLL 0
187 # else
188 # define EV_USE_POLL 1
189 # endif
190 #endif
191
192 #ifndef EV_USE_EPOLL
193 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
194 # define EV_USE_EPOLL 1
195 # else
196 # define EV_USE_EPOLL 0
197 # endif
198 #endif
199
200 #ifndef EV_USE_KQUEUE
201 # define EV_USE_KQUEUE 0
202 #endif
203
204 #ifndef EV_USE_PORT
205 # define EV_USE_PORT 0
206 #endif
207
208 #ifndef EV_USE_INOTIFY
209 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
210 # define EV_USE_INOTIFY 1
211 # else
212 # define EV_USE_INOTIFY 0
213 # endif
214 #endif
215
216 #ifndef EV_PID_HASHSIZE
217 # if EV_MINIMAL
218 # define EV_PID_HASHSIZE 1
219 # else
220 # define EV_PID_HASHSIZE 16
221 # endif
222 #endif
223
224 #ifndef EV_INOTIFY_HASHSIZE
225 # if EV_MINIMAL
226 # define EV_INOTIFY_HASHSIZE 1
227 # else
228 # define EV_INOTIFY_HASHSIZE 16
229 # endif
230 #endif
231
232 #ifndef EV_USE_EVENTFD
233 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
234 # define EV_USE_EVENTFD 1
235 # else
236 # define EV_USE_EVENTFD 0
237 # endif
238 #endif
239
240 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
241
242 #ifndef CLOCK_MONOTONIC
243 # undef EV_USE_MONOTONIC
244 # define EV_USE_MONOTONIC 0
245 #endif
246
247 #ifndef CLOCK_REALTIME
248 # undef EV_USE_REALTIME
249 # define EV_USE_REALTIME 0
250 #endif
251
252 #if !EV_STAT_ENABLE
253 # undef EV_USE_INOTIFY
254 # define EV_USE_INOTIFY 0
255 #endif
256
257 #if !EV_USE_NANOSLEEP
258 # ifndef _WIN32
259 # include <sys/select.h>
260 # endif
261 #endif
262
263 #if EV_USE_INOTIFY
264 # include <sys/inotify.h>
265 #endif
266
267 #if EV_SELECT_IS_WINSOCKET
268 # include <winsock.h>
269 #endif
270
271 #if EV_USE_EVENTFD
272 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
273 # include <stdint.h>
274 # ifdef __cplusplus
275 extern "C" {
276 # endif
277 int eventfd (unsigned int initval, int flags);
278 # ifdef __cplusplus
279 }
280 # endif
281 #endif
282
283 /**/
284
285 /*
286 * This is used to avoid floating point rounding problems.
287 * It is added to ev_rt_now when scheduling periodics
288 * to ensure progress, time-wise, even when rounding
289 * errors are against us.
290 * This value is good at least till the year 4000.
291 * Better solutions welcome.
292 */
293 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
294
295 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
296 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
297 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
298
299 #if __GNUC__ >= 4
300 # define expect(expr,value) __builtin_expect ((expr),(value))
301 # define noinline __attribute__ ((noinline))
302 #else
303 # define expect(expr,value) (expr)
304 # define noinline
305 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
306 # define inline
307 # endif
308 #endif
309
310 #define expect_false(expr) expect ((expr) != 0, 0)
311 #define expect_true(expr) expect ((expr) != 0, 1)
312 #define inline_size static inline
313
314 #if EV_MINIMAL
315 # define inline_speed static noinline
316 #else
317 # define inline_speed static inline
318 #endif
319
320 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
321 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
322
323 #define EMPTY /* required for microsofts broken pseudo-c compiler */
324 #define EMPTY2(a,b) /* used to suppress some warnings */
325
326 typedef ev_watcher *W;
327 typedef ev_watcher_list *WL;
328 typedef ev_watcher_time *WT;
329
330 #if EV_USE_MONOTONIC
331 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
332 /* giving it a reasonably high chance of working on typical architetcures */
333 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
334 #endif
335
336 #ifdef _WIN32
337 # include "ev_win32.c"
338 #endif
339
340 /*****************************************************************************/
341
342 static void (*syserr_cb)(const char *msg);
343
344 void
345 ev_set_syserr_cb (void (*cb)(const char *msg))
346 {
347 syserr_cb = cb;
348 }
349
350 static void noinline
351 syserr (const char *msg)
352 {
353 if (!msg)
354 msg = "(libev) system error";
355
356 if (syserr_cb)
357 syserr_cb (msg);
358 else
359 {
360 perror (msg);
361 abort ();
362 }
363 }
364
365 static void *
366 ev_realloc_emul (void *ptr, long size)
367 {
368 /* some systems, notably openbsd and darwin, fail to properly
369 * implement realloc (x, 0) (as required by both ansi c-98 and
370 * the single unix specification, so work around them here.
371 */
372
373 if (size)
374 return realloc (ptr, size);
375
376 free (ptr);
377 return 0;
378 }
379
380 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
381
382 void
383 ev_set_allocator (void *(*cb)(void *ptr, long size))
384 {
385 alloc = cb;
386 }
387
388 inline_speed void *
389 ev_realloc (void *ptr, long size)
390 {
391 ptr = alloc (ptr, size);
392
393 if (!ptr && size)
394 {
395 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
396 abort ();
397 }
398
399 return ptr;
400 }
401
402 #define ev_malloc(size) ev_realloc (0, (size))
403 #define ev_free(ptr) ev_realloc ((ptr), 0)
404
405 /*****************************************************************************/
406
407 typedef struct
408 {
409 WL head;
410 unsigned char events;
411 unsigned char reify;
412 #if EV_SELECT_IS_WINSOCKET
413 SOCKET handle;
414 #endif
415 } ANFD;
416
417 typedef struct
418 {
419 W w;
420 int events;
421 } ANPENDING;
422
423 #if EV_USE_INOTIFY
424 typedef struct
425 {
426 WL head;
427 } ANFS;
428 #endif
429
430 #if EV_MULTIPLICITY
431
432 struct ev_loop
433 {
434 ev_tstamp ev_rt_now;
435 #define ev_rt_now ((loop)->ev_rt_now)
436 #define VAR(name,decl) decl;
437 #include "ev_vars.h"
438 #undef VAR
439 };
440 #include "ev_wrap.h"
441
442 static struct ev_loop default_loop_struct;
443 struct ev_loop *ev_default_loop_ptr;
444
445 #else
446
447 ev_tstamp ev_rt_now;
448 #define VAR(name,decl) static decl;
449 #include "ev_vars.h"
450 #undef VAR
451
452 static int ev_default_loop_ptr;
453
454 #endif
455
456 /*****************************************************************************/
457
458 ev_tstamp
459 ev_time (void)
460 {
461 #if EV_USE_REALTIME
462 struct timespec ts;
463 clock_gettime (CLOCK_REALTIME, &ts);
464 return ts.tv_sec + ts.tv_nsec * 1e-9;
465 #else
466 struct timeval tv;
467 gettimeofday (&tv, 0);
468 return tv.tv_sec + tv.tv_usec * 1e-6;
469 #endif
470 }
471
472 ev_tstamp inline_size
473 get_clock (void)
474 {
475 #if EV_USE_MONOTONIC
476 if (expect_true (have_monotonic))
477 {
478 struct timespec ts;
479 clock_gettime (CLOCK_MONOTONIC, &ts);
480 return ts.tv_sec + ts.tv_nsec * 1e-9;
481 }
482 #endif
483
484 return ev_time ();
485 }
486
487 #if EV_MULTIPLICITY
488 ev_tstamp
489 ev_now (EV_P)
490 {
491 return ev_rt_now;
492 }
493 #endif
494
495 void
496 ev_sleep (ev_tstamp delay)
497 {
498 if (delay > 0.)
499 {
500 #if EV_USE_NANOSLEEP
501 struct timespec ts;
502
503 ts.tv_sec = (time_t)delay;
504 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
505
506 nanosleep (&ts, 0);
507 #elif defined(_WIN32)
508 Sleep ((unsigned long)(delay * 1e3));
509 #else
510 struct timeval tv;
511
512 tv.tv_sec = (time_t)delay;
513 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
514
515 select (0, 0, 0, 0, &tv);
516 #endif
517 }
518 }
519
520 /*****************************************************************************/
521
522 int inline_size
523 array_nextsize (int elem, int cur, int cnt)
524 {
525 int ncur = cur + 1;
526
527 do
528 ncur <<= 1;
529 while (cnt > ncur);
530
531 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
532 if (elem * ncur > 4096)
533 {
534 ncur *= elem;
535 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
536 ncur = ncur - sizeof (void *) * 4;
537 ncur /= elem;
538 }
539
540 return ncur;
541 }
542
543 static noinline void *
544 array_realloc (int elem, void *base, int *cur, int cnt)
545 {
546 *cur = array_nextsize (elem, *cur, cnt);
547 return ev_realloc (base, elem * *cur);
548 }
549
550 #define array_needsize(type,base,cur,cnt,init) \
551 if (expect_false ((cnt) > (cur))) \
552 { \
553 int ocur_ = (cur); \
554 (base) = (type *)array_realloc \
555 (sizeof (type), (base), &(cur), (cnt)); \
556 init ((base) + (ocur_), (cur) - ocur_); \
557 }
558
559 #if 0
560 #define array_slim(type,stem) \
561 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
562 { \
563 stem ## max = array_roundsize (stem ## cnt >> 1); \
564 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
565 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
566 }
567 #endif
568
569 #define array_free(stem, idx) \
570 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
571
572 /*****************************************************************************/
573
574 void noinline
575 ev_feed_event (EV_P_ void *w, int revents)
576 {
577 W w_ = (W)w;
578 int pri = ABSPRI (w_);
579
580 if (expect_false (w_->pending))
581 pendings [pri][w_->pending - 1].events |= revents;
582 else
583 {
584 w_->pending = ++pendingcnt [pri];
585 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
586 pendings [pri][w_->pending - 1].w = w_;
587 pendings [pri][w_->pending - 1].events = revents;
588 }
589 }
590
591 void inline_speed
592 queue_events (EV_P_ W *events, int eventcnt, int type)
593 {
594 int i;
595
596 for (i = 0; i < eventcnt; ++i)
597 ev_feed_event (EV_A_ events [i], type);
598 }
599
600 /*****************************************************************************/
601
602 void inline_size
603 anfds_init (ANFD *base, int count)
604 {
605 while (count--)
606 {
607 base->head = 0;
608 base->events = EV_NONE;
609 base->reify = 0;
610
611 ++base;
612 }
613 }
614
615 void inline_speed
616 fd_event (EV_P_ int fd, int revents)
617 {
618 ANFD *anfd = anfds + fd;
619 ev_io *w;
620
621 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
622 {
623 int ev = w->events & revents;
624
625 if (ev)
626 ev_feed_event (EV_A_ (W)w, ev);
627 }
628 }
629
630 void
631 ev_feed_fd_event (EV_P_ int fd, int revents)
632 {
633 if (fd >= 0 && fd < anfdmax)
634 fd_event (EV_A_ fd, revents);
635 }
636
637 void inline_size
638 fd_reify (EV_P)
639 {
640 int i;
641
642 for (i = 0; i < fdchangecnt; ++i)
643 {
644 int fd = fdchanges [i];
645 ANFD *anfd = anfds + fd;
646 ev_io *w;
647
648 unsigned char events = 0;
649
650 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
651 events |= (unsigned char)w->events;
652
653 #if EV_SELECT_IS_WINSOCKET
654 if (events)
655 {
656 unsigned long argp;
657 #ifdef EV_FD_TO_WIN32_HANDLE
658 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
659 #else
660 anfd->handle = _get_osfhandle (fd);
661 #endif
662 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
663 }
664 #endif
665
666 {
667 unsigned char o_events = anfd->events;
668 unsigned char o_reify = anfd->reify;
669
670 anfd->reify = 0;
671 anfd->events = events;
672
673 if (o_events != events || o_reify & EV_IOFDSET)
674 backend_modify (EV_A_ fd, o_events, events);
675 }
676 }
677
678 fdchangecnt = 0;
679 }
680
681 void inline_size
682 fd_change (EV_P_ int fd, int flags)
683 {
684 unsigned char reify = anfds [fd].reify;
685 anfds [fd].reify |= flags;
686
687 if (expect_true (!reify))
688 {
689 ++fdchangecnt;
690 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
691 fdchanges [fdchangecnt - 1] = fd;
692 }
693 }
694
695 void inline_speed
696 fd_kill (EV_P_ int fd)
697 {
698 ev_io *w;
699
700 while ((w = (ev_io *)anfds [fd].head))
701 {
702 ev_io_stop (EV_A_ w);
703 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
704 }
705 }
706
707 int inline_size
708 fd_valid (int fd)
709 {
710 #ifdef _WIN32
711 return _get_osfhandle (fd) != -1;
712 #else
713 return fcntl (fd, F_GETFD) != -1;
714 #endif
715 }
716
717 /* called on EBADF to verify fds */
718 static void noinline
719 fd_ebadf (EV_P)
720 {
721 int fd;
722
723 for (fd = 0; fd < anfdmax; ++fd)
724 if (anfds [fd].events)
725 if (!fd_valid (fd) == -1 && errno == EBADF)
726 fd_kill (EV_A_ fd);
727 }
728
729 /* called on ENOMEM in select/poll to kill some fds and retry */
730 static void noinline
731 fd_enomem (EV_P)
732 {
733 int fd;
734
735 for (fd = anfdmax; fd--; )
736 if (anfds [fd].events)
737 {
738 fd_kill (EV_A_ fd);
739 return;
740 }
741 }
742
743 /* usually called after fork if backend needs to re-arm all fds from scratch */
744 static void noinline
745 fd_rearm_all (EV_P)
746 {
747 int fd;
748
749 for (fd = 0; fd < anfdmax; ++fd)
750 if (anfds [fd].events)
751 {
752 anfds [fd].events = 0;
753 fd_change (EV_A_ fd, EV_IOFDSET | 1);
754 }
755 }
756
757 /*****************************************************************************/
758
759 void inline_speed
760 upheap (WT *heap, int k)
761 {
762 WT w = heap [k];
763
764 while (k)
765 {
766 int p = (k - 1) >> 1;
767
768 if (heap [p]->at <= w->at)
769 break;
770
771 heap [k] = heap [p];
772 ((W)heap [k])->active = k + 1;
773 k = p;
774 }
775
776 heap [k] = w;
777 ((W)heap [k])->active = k + 1;
778 }
779
780 void inline_speed
781 downheap (WT *heap, int N, int k)
782 {
783 WT w = heap [k];
784
785 for (;;)
786 {
787 int c = (k << 1) + 1;
788
789 if (c >= N)
790 break;
791
792 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
793 ? 1 : 0;
794
795 if (w->at <= heap [c]->at)
796 break;
797
798 heap [k] = heap [c];
799 ((W)heap [k])->active = k + 1;
800
801 k = c;
802 }
803
804 heap [k] = w;
805 ((W)heap [k])->active = k + 1;
806 }
807
808 void inline_size
809 adjustheap (WT *heap, int N, int k)
810 {
811 upheap (heap, k);
812 downheap (heap, N, k);
813 }
814
815 /*****************************************************************************/
816
817 typedef struct
818 {
819 WL head;
820 EV_ATOMIC_T gotsig;
821 } ANSIG;
822
823 static ANSIG *signals;
824 static int signalmax;
825
826 static EV_ATOMIC_T gotsig;
827
828 void inline_size
829 signals_init (ANSIG *base, int count)
830 {
831 while (count--)
832 {
833 base->head = 0;
834 base->gotsig = 0;
835
836 ++base;
837 }
838 }
839
840 /*****************************************************************************/
841
842 void inline_speed
843 fd_intern (int fd)
844 {
845 #ifdef _WIN32
846 int arg = 1;
847 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
848 #else
849 fcntl (fd, F_SETFD, FD_CLOEXEC);
850 fcntl (fd, F_SETFL, O_NONBLOCK);
851 #endif
852 }
853
854 static void noinline
855 evpipe_init (EV_P)
856 {
857 if (!ev_is_active (&pipeev))
858 {
859 #if EV_USE_EVENTFD
860 if ((evfd = eventfd (0, 0)) >= 0)
861 {
862 evpipe [0] = -1;
863 fd_intern (evfd);
864 ev_io_set (&pipeev, evfd, EV_READ);
865 }
866 else
867 #endif
868 {
869 while (pipe (evpipe))
870 syserr ("(libev) error creating signal/async pipe");
871
872 fd_intern (evpipe [0]);
873 fd_intern (evpipe [1]);
874 ev_io_set (&pipeev, evpipe [0], EV_READ);
875 }
876
877 ev_io_start (EV_A_ &pipeev);
878 ev_unref (EV_A); /* watcher should not keep loop alive */
879 }
880 }
881
882 void inline_size
883 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
884 {
885 if (!*flag)
886 {
887 int old_errno = errno; /* save errno because write might clobber it */
888
889 *flag = 1;
890
891 #if EV_USE_EVENTFD
892 if (evfd >= 0)
893 {
894 uint64_t counter = 1;
895 write (evfd, &counter, sizeof (uint64_t));
896 }
897 else
898 #endif
899 write (evpipe [1], &old_errno, 1);
900
901 errno = old_errno;
902 }
903 }
904
905 static void
906 pipecb (EV_P_ ev_io *iow, int revents)
907 {
908 #if EV_USE_EVENTFD
909 if (evfd >= 0)
910 {
911 uint64_t counter = 1;
912 read (evfd, &counter, sizeof (uint64_t));
913 }
914 else
915 #endif
916 {
917 char dummy;
918 read (evpipe [0], &dummy, 1);
919 }
920
921 if (gotsig && ev_is_default_loop (EV_A))
922 {
923 int signum;
924 gotsig = 0;
925
926 for (signum = signalmax; signum--; )
927 if (signals [signum].gotsig)
928 ev_feed_signal_event (EV_A_ signum + 1);
929 }
930
931 #if EV_ASYNC_ENABLE
932 if (gotasync)
933 {
934 int i;
935 gotasync = 0;
936
937 for (i = asynccnt; i--; )
938 if (asyncs [i]->sent)
939 {
940 asyncs [i]->sent = 0;
941 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
942 }
943 }
944 #endif
945 }
946
947 /*****************************************************************************/
948
949 static void
950 ev_sighandler (int signum)
951 {
952 #if EV_MULTIPLICITY
953 struct ev_loop *loop = &default_loop_struct;
954 #endif
955
956 #if _WIN32
957 signal (signum, ev_sighandler);
958 #endif
959
960 signals [signum - 1].gotsig = 1;
961 evpipe_write (EV_A_ &gotsig);
962 }
963
964 void noinline
965 ev_feed_signal_event (EV_P_ int signum)
966 {
967 WL w;
968
969 #if EV_MULTIPLICITY
970 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
971 #endif
972
973 --signum;
974
975 if (signum < 0 || signum >= signalmax)
976 return;
977
978 signals [signum].gotsig = 0;
979
980 for (w = signals [signum].head; w; w = w->next)
981 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
982 }
983
984 /*****************************************************************************/
985
986 static WL childs [EV_PID_HASHSIZE];
987
988 #ifndef _WIN32
989
990 static ev_signal childev;
991
992 #ifndef WIFCONTINUED
993 # define WIFCONTINUED(status) 0
994 #endif
995
996 void inline_speed
997 child_reap (EV_P_ int chain, int pid, int status)
998 {
999 ev_child *w;
1000 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1001
1002 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1003 {
1004 if ((w->pid == pid || !w->pid)
1005 && (!traced || (w->flags & 1)))
1006 {
1007 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1008 w->rpid = pid;
1009 w->rstatus = status;
1010 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1011 }
1012 }
1013 }
1014
1015 #ifndef WCONTINUED
1016 # define WCONTINUED 0
1017 #endif
1018
1019 static void
1020 childcb (EV_P_ ev_signal *sw, int revents)
1021 {
1022 int pid, status;
1023
1024 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1025 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1026 if (!WCONTINUED
1027 || errno != EINVAL
1028 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1029 return;
1030
1031 /* make sure we are called again until all children have been reaped */
1032 /* we need to do it this way so that the callback gets called before we continue */
1033 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1034
1035 child_reap (EV_A_ pid, pid, status);
1036 if (EV_PID_HASHSIZE > 1)
1037 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1038 }
1039
1040 #endif
1041
1042 /*****************************************************************************/
1043
1044 #if EV_USE_PORT
1045 # include "ev_port.c"
1046 #endif
1047 #if EV_USE_KQUEUE
1048 # include "ev_kqueue.c"
1049 #endif
1050 #if EV_USE_EPOLL
1051 # include "ev_epoll.c"
1052 #endif
1053 #if EV_USE_POLL
1054 # include "ev_poll.c"
1055 #endif
1056 #if EV_USE_SELECT
1057 # include "ev_select.c"
1058 #endif
1059
1060 int
1061 ev_version_major (void)
1062 {
1063 return EV_VERSION_MAJOR;
1064 }
1065
1066 int
1067 ev_version_minor (void)
1068 {
1069 return EV_VERSION_MINOR;
1070 }
1071
1072 /* return true if we are running with elevated privileges and should ignore env variables */
1073 int inline_size
1074 enable_secure (void)
1075 {
1076 #ifdef _WIN32
1077 return 0;
1078 #else
1079 return getuid () != geteuid ()
1080 || getgid () != getegid ();
1081 #endif
1082 }
1083
1084 unsigned int
1085 ev_supported_backends (void)
1086 {
1087 unsigned int flags = 0;
1088
1089 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1090 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1091 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1092 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1093 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1094
1095 return flags;
1096 }
1097
1098 unsigned int
1099 ev_recommended_backends (void)
1100 {
1101 unsigned int flags = ev_supported_backends ();
1102
1103 #ifndef __NetBSD__
1104 /* kqueue is borked on everything but netbsd apparently */
1105 /* it usually doesn't work correctly on anything but sockets and pipes */
1106 flags &= ~EVBACKEND_KQUEUE;
1107 #endif
1108 #ifdef __APPLE__
1109 // flags &= ~EVBACKEND_KQUEUE; for documentation
1110 flags &= ~EVBACKEND_POLL;
1111 #endif
1112
1113 return flags;
1114 }
1115
1116 unsigned int
1117 ev_embeddable_backends (void)
1118 {
1119 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1120
1121 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1122 /* please fix it and tell me how to detect the fix */
1123 flags &= ~EVBACKEND_EPOLL;
1124
1125 return flags;
1126 }
1127
1128 unsigned int
1129 ev_backend (EV_P)
1130 {
1131 return backend;
1132 }
1133
1134 unsigned int
1135 ev_loop_count (EV_P)
1136 {
1137 return loop_count;
1138 }
1139
1140 void
1141 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1142 {
1143 io_blocktime = interval;
1144 }
1145
1146 void
1147 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1148 {
1149 timeout_blocktime = interval;
1150 }
1151
1152 static void noinline
1153 loop_init (EV_P_ unsigned int flags)
1154 {
1155 if (!backend)
1156 {
1157 #if EV_USE_MONOTONIC
1158 {
1159 struct timespec ts;
1160 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1161 have_monotonic = 1;
1162 }
1163 #endif
1164
1165 ev_rt_now = ev_time ();
1166 mn_now = get_clock ();
1167 now_floor = mn_now;
1168 rtmn_diff = ev_rt_now - mn_now;
1169
1170 io_blocktime = 0.;
1171 timeout_blocktime = 0.;
1172 backend = 0;
1173 backend_fd = -1;
1174 gotasync = 0;
1175 #if EV_USE_INOTIFY
1176 fs_fd = -2;
1177 #endif
1178
1179 /* pid check not overridable via env */
1180 #ifndef _WIN32
1181 if (flags & EVFLAG_FORKCHECK)
1182 curpid = getpid ();
1183 #endif
1184
1185 if (!(flags & EVFLAG_NOENV)
1186 && !enable_secure ()
1187 && getenv ("LIBEV_FLAGS"))
1188 flags = atoi (getenv ("LIBEV_FLAGS"));
1189
1190 if (!(flags & 0x0000ffffUL))
1191 flags |= ev_recommended_backends ();
1192
1193 #if EV_USE_PORT
1194 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1195 #endif
1196 #if EV_USE_KQUEUE
1197 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1198 #endif
1199 #if EV_USE_EPOLL
1200 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1201 #endif
1202 #if EV_USE_POLL
1203 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1204 #endif
1205 #if EV_USE_SELECT
1206 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1207 #endif
1208
1209 ev_init (&pipeev, pipecb);
1210 ev_set_priority (&pipeev, EV_MAXPRI);
1211 }
1212 }
1213
1214 static void noinline
1215 loop_destroy (EV_P)
1216 {
1217 int i;
1218
1219 if (ev_is_active (&pipeev))
1220 {
1221 ev_ref (EV_A); /* signal watcher */
1222 ev_io_stop (EV_A_ &pipeev);
1223
1224 #if EV_USE_EVENTFD
1225 if (evfd >= 0)
1226 close (evfd);
1227 #endif
1228
1229 if (evpipe [0] >= 0)
1230 {
1231 close (evpipe [0]);
1232 close (evpipe [1]);
1233 }
1234 }
1235
1236 #if EV_USE_INOTIFY
1237 if (fs_fd >= 0)
1238 close (fs_fd);
1239 #endif
1240
1241 if (backend_fd >= 0)
1242 close (backend_fd);
1243
1244 #if EV_USE_PORT
1245 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1246 #endif
1247 #if EV_USE_KQUEUE
1248 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1249 #endif
1250 #if EV_USE_EPOLL
1251 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1252 #endif
1253 #if EV_USE_POLL
1254 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1255 #endif
1256 #if EV_USE_SELECT
1257 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1258 #endif
1259
1260 for (i = NUMPRI; i--; )
1261 {
1262 array_free (pending, [i]);
1263 #if EV_IDLE_ENABLE
1264 array_free (idle, [i]);
1265 #endif
1266 }
1267
1268 ev_free (anfds); anfdmax = 0;
1269
1270 /* have to use the microsoft-never-gets-it-right macro */
1271 array_free (fdchange, EMPTY);
1272 array_free (timer, EMPTY);
1273 #if EV_PERIODIC_ENABLE
1274 array_free (periodic, EMPTY);
1275 #endif
1276 #if EV_FORK_ENABLE
1277 array_free (fork, EMPTY);
1278 #endif
1279 array_free (prepare, EMPTY);
1280 array_free (check, EMPTY);
1281 #if EV_ASYNC_ENABLE
1282 array_free (async, EMPTY);
1283 #endif
1284
1285 backend = 0;
1286 }
1287
1288 void inline_size infy_fork (EV_P);
1289
1290 void inline_size
1291 loop_fork (EV_P)
1292 {
1293 #if EV_USE_PORT
1294 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1295 #endif
1296 #if EV_USE_KQUEUE
1297 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1298 #endif
1299 #if EV_USE_EPOLL
1300 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1301 #endif
1302 #if EV_USE_INOTIFY
1303 infy_fork (EV_A);
1304 #endif
1305
1306 if (ev_is_active (&pipeev))
1307 {
1308 /* this "locks" the handlers against writing to the pipe */
1309 /* while we modify the fd vars */
1310 gotsig = 1;
1311 #if EV_ASYNC_ENABLE
1312 gotasync = 1;
1313 #endif
1314
1315 ev_ref (EV_A);
1316 ev_io_stop (EV_A_ &pipeev);
1317
1318 #if EV_USE_EVENTFD
1319 if (evfd >= 0)
1320 close (evfd);
1321 #endif
1322
1323 if (evpipe [0] >= 0)
1324 {
1325 close (evpipe [0]);
1326 close (evpipe [1]);
1327 }
1328
1329 evpipe_init (EV_A);
1330 /* now iterate over everything, in case we missed something */
1331 pipecb (EV_A_ &pipeev, EV_READ);
1332 }
1333
1334 postfork = 0;
1335 }
1336
1337 #if EV_MULTIPLICITY
1338 struct ev_loop *
1339 ev_loop_new (unsigned int flags)
1340 {
1341 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1342
1343 memset (loop, 0, sizeof (struct ev_loop));
1344
1345 loop_init (EV_A_ flags);
1346
1347 if (ev_backend (EV_A))
1348 return loop;
1349
1350 return 0;
1351 }
1352
1353 void
1354 ev_loop_destroy (EV_P)
1355 {
1356 loop_destroy (EV_A);
1357 ev_free (loop);
1358 }
1359
1360 void
1361 ev_loop_fork (EV_P)
1362 {
1363 postfork = 1; /* must be in line with ev_default_fork */
1364 }
1365
1366 #endif
1367
1368 #if EV_MULTIPLICITY
1369 struct ev_loop *
1370 ev_default_loop_init (unsigned int flags)
1371 #else
1372 int
1373 ev_default_loop (unsigned int flags)
1374 #endif
1375 {
1376 if (!ev_default_loop_ptr)
1377 {
1378 #if EV_MULTIPLICITY
1379 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1380 #else
1381 ev_default_loop_ptr = 1;
1382 #endif
1383
1384 loop_init (EV_A_ flags);
1385
1386 if (ev_backend (EV_A))
1387 {
1388 #ifndef _WIN32
1389 ev_signal_init (&childev, childcb, SIGCHLD);
1390 ev_set_priority (&childev, EV_MAXPRI);
1391 ev_signal_start (EV_A_ &childev);
1392 ev_unref (EV_A); /* child watcher should not keep loop alive */
1393 #endif
1394 }
1395 else
1396 ev_default_loop_ptr = 0;
1397 }
1398
1399 return ev_default_loop_ptr;
1400 }
1401
1402 void
1403 ev_default_destroy (void)
1404 {
1405 #if EV_MULTIPLICITY
1406 struct ev_loop *loop = ev_default_loop_ptr;
1407 #endif
1408
1409 #ifndef _WIN32
1410 ev_ref (EV_A); /* child watcher */
1411 ev_signal_stop (EV_A_ &childev);
1412 #endif
1413
1414 loop_destroy (EV_A);
1415 }
1416
1417 void
1418 ev_default_fork (void)
1419 {
1420 #if EV_MULTIPLICITY
1421 struct ev_loop *loop = ev_default_loop_ptr;
1422 #endif
1423
1424 if (backend)
1425 postfork = 1; /* must be in line with ev_loop_fork */
1426 }
1427
1428 /*****************************************************************************/
1429
1430 void
1431 ev_invoke (EV_P_ void *w, int revents)
1432 {
1433 EV_CB_INVOKE ((W)w, revents);
1434 }
1435
1436 void inline_speed
1437 call_pending (EV_P)
1438 {
1439 int pri;
1440
1441 for (pri = NUMPRI; pri--; )
1442 while (pendingcnt [pri])
1443 {
1444 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1445
1446 if (expect_true (p->w))
1447 {
1448 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1449
1450 p->w->pending = 0;
1451 EV_CB_INVOKE (p->w, p->events);
1452 }
1453 }
1454 }
1455
1456 void inline_size
1457 timers_reify (EV_P)
1458 {
1459 while (timercnt && ((WT)timers [0])->at <= mn_now)
1460 {
1461 ev_timer *w = (ev_timer *)timers [0];
1462
1463 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1464
1465 /* first reschedule or stop timer */
1466 if (w->repeat)
1467 {
1468 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1469
1470 ((WT)w)->at += w->repeat;
1471 if (((WT)w)->at < mn_now)
1472 ((WT)w)->at = mn_now;
1473
1474 downheap (timers, timercnt, 0);
1475 }
1476 else
1477 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1478
1479 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1480 }
1481 }
1482
1483 #if EV_PERIODIC_ENABLE
1484 void inline_size
1485 periodics_reify (EV_P)
1486 {
1487 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1488 {
1489 ev_periodic *w = (ev_periodic *)periodics [0];
1490
1491 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1492
1493 /* first reschedule or stop timer */
1494 if (w->reschedule_cb)
1495 {
1496 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1497 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1498 downheap (periodics, periodiccnt, 0);
1499 }
1500 else if (w->interval)
1501 {
1502 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1503 if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
1504 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1505 downheap (periodics, periodiccnt, 0);
1506 }
1507 else
1508 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1509
1510 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1511 }
1512 }
1513
1514 static void noinline
1515 periodics_reschedule (EV_P)
1516 {
1517 int i;
1518
1519 /* adjust periodics after time jump */
1520 for (i = 0; i < periodiccnt; ++i)
1521 {
1522 ev_periodic *w = (ev_periodic *)periodics [i];
1523
1524 if (w->reschedule_cb)
1525 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1526 else if (w->interval)
1527 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1528 }
1529
1530 /* now rebuild the heap */
1531 for (i = periodiccnt >> 1; i--; )
1532 downheap (periodics, periodiccnt, i);
1533 }
1534 #endif
1535
1536 #if EV_IDLE_ENABLE
1537 void inline_size
1538 idle_reify (EV_P)
1539 {
1540 if (expect_false (idleall))
1541 {
1542 int pri;
1543
1544 for (pri = NUMPRI; pri--; )
1545 {
1546 if (pendingcnt [pri])
1547 break;
1548
1549 if (idlecnt [pri])
1550 {
1551 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1552 break;
1553 }
1554 }
1555 }
1556 }
1557 #endif
1558
1559 void inline_speed
1560 time_update (EV_P_ ev_tstamp max_block)
1561 {
1562 int i;
1563
1564 #if EV_USE_MONOTONIC
1565 if (expect_true (have_monotonic))
1566 {
1567 ev_tstamp odiff = rtmn_diff;
1568
1569 mn_now = get_clock ();
1570
1571 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1572 /* interpolate in the meantime */
1573 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1574 {
1575 ev_rt_now = rtmn_diff + mn_now;
1576 return;
1577 }
1578
1579 now_floor = mn_now;
1580 ev_rt_now = ev_time ();
1581
1582 /* loop a few times, before making important decisions.
1583 * on the choice of "4": one iteration isn't enough,
1584 * in case we get preempted during the calls to
1585 * ev_time and get_clock. a second call is almost guaranteed
1586 * to succeed in that case, though. and looping a few more times
1587 * doesn't hurt either as we only do this on time-jumps or
1588 * in the unlikely event of having been preempted here.
1589 */
1590 for (i = 4; --i; )
1591 {
1592 rtmn_diff = ev_rt_now - mn_now;
1593
1594 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1595 return; /* all is well */
1596
1597 ev_rt_now = ev_time ();
1598 mn_now = get_clock ();
1599 now_floor = mn_now;
1600 }
1601
1602 # if EV_PERIODIC_ENABLE
1603 periodics_reschedule (EV_A);
1604 # endif
1605 /* no timer adjustment, as the monotonic clock doesn't jump */
1606 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1607 }
1608 else
1609 #endif
1610 {
1611 ev_rt_now = ev_time ();
1612
1613 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1614 {
1615 #if EV_PERIODIC_ENABLE
1616 periodics_reschedule (EV_A);
1617 #endif
1618 /* adjust timers. this is easy, as the offset is the same for all of them */
1619 for (i = 0; i < timercnt; ++i)
1620 ((WT)timers [i])->at += ev_rt_now - mn_now;
1621 }
1622
1623 mn_now = ev_rt_now;
1624 }
1625 }
1626
1627 void
1628 ev_ref (EV_P)
1629 {
1630 ++activecnt;
1631 }
1632
1633 void
1634 ev_unref (EV_P)
1635 {
1636 --activecnt;
1637 }
1638
1639 static int loop_done;
1640
1641 void
1642 ev_loop (EV_P_ int flags)
1643 {
1644 loop_done = EVUNLOOP_CANCEL;
1645
1646 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1647
1648 do
1649 {
1650 #ifndef _WIN32
1651 if (expect_false (curpid)) /* penalise the forking check even more */
1652 if (expect_false (getpid () != curpid))
1653 {
1654 curpid = getpid ();
1655 postfork = 1;
1656 }
1657 #endif
1658
1659 #if EV_FORK_ENABLE
1660 /* we might have forked, so queue fork handlers */
1661 if (expect_false (postfork))
1662 if (forkcnt)
1663 {
1664 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1665 call_pending (EV_A);
1666 }
1667 #endif
1668
1669 /* queue prepare watchers (and execute them) */
1670 if (expect_false (preparecnt))
1671 {
1672 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1673 call_pending (EV_A);
1674 }
1675
1676 if (expect_false (!activecnt))
1677 break;
1678
1679 /* we might have forked, so reify kernel state if necessary */
1680 if (expect_false (postfork))
1681 loop_fork (EV_A);
1682
1683 /* update fd-related kernel structures */
1684 fd_reify (EV_A);
1685
1686 /* calculate blocking time */
1687 {
1688 ev_tstamp waittime = 0.;
1689 ev_tstamp sleeptime = 0.;
1690
1691 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1692 {
1693 /* update time to cancel out callback processing overhead */
1694 time_update (EV_A_ 1e100);
1695
1696 waittime = MAX_BLOCKTIME;
1697
1698 if (timercnt)
1699 {
1700 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1701 if (waittime > to) waittime = to;
1702 }
1703
1704 #if EV_PERIODIC_ENABLE
1705 if (periodiccnt)
1706 {
1707 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1708 if (waittime > to) waittime = to;
1709 }
1710 #endif
1711
1712 if (expect_false (waittime < timeout_blocktime))
1713 waittime = timeout_blocktime;
1714
1715 sleeptime = waittime - backend_fudge;
1716
1717 if (expect_true (sleeptime > io_blocktime))
1718 sleeptime = io_blocktime;
1719
1720 if (sleeptime)
1721 {
1722 ev_sleep (sleeptime);
1723 waittime -= sleeptime;
1724 }
1725 }
1726
1727 ++loop_count;
1728 backend_poll (EV_A_ waittime);
1729
1730 /* update ev_rt_now, do magic */
1731 time_update (EV_A_ waittime + sleeptime);
1732 }
1733
1734 /* queue pending timers and reschedule them */
1735 timers_reify (EV_A); /* relative timers called last */
1736 #if EV_PERIODIC_ENABLE
1737 periodics_reify (EV_A); /* absolute timers called first */
1738 #endif
1739
1740 #if EV_IDLE_ENABLE
1741 /* queue idle watchers unless other events are pending */
1742 idle_reify (EV_A);
1743 #endif
1744
1745 /* queue check watchers, to be executed first */
1746 if (expect_false (checkcnt))
1747 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1748
1749 call_pending (EV_A);
1750 }
1751 while (expect_true (
1752 activecnt
1753 && !loop_done
1754 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
1755 ));
1756
1757 if (loop_done == EVUNLOOP_ONE)
1758 loop_done = EVUNLOOP_CANCEL;
1759 }
1760
1761 void
1762 ev_unloop (EV_P_ int how)
1763 {
1764 loop_done = how;
1765 }
1766
1767 /*****************************************************************************/
1768
1769 void inline_size
1770 wlist_add (WL *head, WL elem)
1771 {
1772 elem->next = *head;
1773 *head = elem;
1774 }
1775
1776 void inline_size
1777 wlist_del (WL *head, WL elem)
1778 {
1779 while (*head)
1780 {
1781 if (*head == elem)
1782 {
1783 *head = elem->next;
1784 return;
1785 }
1786
1787 head = &(*head)->next;
1788 }
1789 }
1790
1791 void inline_speed
1792 clear_pending (EV_P_ W w)
1793 {
1794 if (w->pending)
1795 {
1796 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1797 w->pending = 0;
1798 }
1799 }
1800
1801 int
1802 ev_clear_pending (EV_P_ void *w)
1803 {
1804 W w_ = (W)w;
1805 int pending = w_->pending;
1806
1807 if (expect_true (pending))
1808 {
1809 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1810 w_->pending = 0;
1811 p->w = 0;
1812 return p->events;
1813 }
1814 else
1815 return 0;
1816 }
1817
1818 void inline_size
1819 pri_adjust (EV_P_ W w)
1820 {
1821 int pri = w->priority;
1822 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1823 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1824 w->priority = pri;
1825 }
1826
1827 void inline_speed
1828 ev_start (EV_P_ W w, int active)
1829 {
1830 pri_adjust (EV_A_ w);
1831 w->active = active;
1832 ev_ref (EV_A);
1833 }
1834
1835 void inline_size
1836 ev_stop (EV_P_ W w)
1837 {
1838 ev_unref (EV_A);
1839 w->active = 0;
1840 }
1841
1842 /*****************************************************************************/
1843
1844 void noinline
1845 ev_io_start (EV_P_ ev_io *w)
1846 {
1847 int fd = w->fd;
1848
1849 if (expect_false (ev_is_active (w)))
1850 return;
1851
1852 assert (("ev_io_start called with negative fd", fd >= 0));
1853
1854 ev_start (EV_A_ (W)w, 1);
1855 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1856 wlist_add (&anfds[fd].head, (WL)w);
1857
1858 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1859 w->events &= ~EV_IOFDSET;
1860 }
1861
1862 void noinline
1863 ev_io_stop (EV_P_ ev_io *w)
1864 {
1865 clear_pending (EV_A_ (W)w);
1866 if (expect_false (!ev_is_active (w)))
1867 return;
1868
1869 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1870
1871 wlist_del (&anfds[w->fd].head, (WL)w);
1872 ev_stop (EV_A_ (W)w);
1873
1874 fd_change (EV_A_ w->fd, 1);
1875 }
1876
1877 void noinline
1878 ev_timer_start (EV_P_ ev_timer *w)
1879 {
1880 if (expect_false (ev_is_active (w)))
1881 return;
1882
1883 ((WT)w)->at += mn_now;
1884
1885 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1886
1887 ev_start (EV_A_ (W)w, ++timercnt);
1888 array_needsize (WT, timers, timermax, timercnt, EMPTY2);
1889 timers [timercnt - 1] = (WT)w;
1890 upheap (timers, timercnt - 1);
1891
1892 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1893 }
1894
1895 void noinline
1896 ev_timer_stop (EV_P_ ev_timer *w)
1897 {
1898 clear_pending (EV_A_ (W)w);
1899 if (expect_false (!ev_is_active (w)))
1900 return;
1901
1902 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
1903
1904 {
1905 int active = ((W)w)->active;
1906
1907 if (expect_true (--active < --timercnt))
1908 {
1909 timers [active] = timers [timercnt];
1910 adjustheap (timers, timercnt, active);
1911 }
1912 }
1913
1914 ((WT)w)->at -= mn_now;
1915
1916 ev_stop (EV_A_ (W)w);
1917 }
1918
1919 void noinline
1920 ev_timer_again (EV_P_ ev_timer *w)
1921 {
1922 if (ev_is_active (w))
1923 {
1924 if (w->repeat)
1925 {
1926 ((WT)w)->at = mn_now + w->repeat;
1927 adjustheap (timers, timercnt, ((W)w)->active - 1);
1928 }
1929 else
1930 ev_timer_stop (EV_A_ w);
1931 }
1932 else if (w->repeat)
1933 {
1934 w->at = w->repeat;
1935 ev_timer_start (EV_A_ w);
1936 }
1937 }
1938
1939 #if EV_PERIODIC_ENABLE
1940 void noinline
1941 ev_periodic_start (EV_P_ ev_periodic *w)
1942 {
1943 if (expect_false (ev_is_active (w)))
1944 return;
1945
1946 if (w->reschedule_cb)
1947 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1948 else if (w->interval)
1949 {
1950 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1951 /* this formula differs from the one in periodic_reify because we do not always round up */
1952 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1953 }
1954 else
1955 ((WT)w)->at = w->offset;
1956
1957 ev_start (EV_A_ (W)w, ++periodiccnt);
1958 array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
1959 periodics [periodiccnt - 1] = (WT)w;
1960 upheap (periodics, periodiccnt - 1);
1961
1962 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1963 }
1964
1965 void noinline
1966 ev_periodic_stop (EV_P_ ev_periodic *w)
1967 {
1968 clear_pending (EV_A_ (W)w);
1969 if (expect_false (!ev_is_active (w)))
1970 return;
1971
1972 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
1973
1974 {
1975 int active = ((W)w)->active;
1976
1977 if (expect_true (--active < --periodiccnt))
1978 {
1979 periodics [active] = periodics [periodiccnt];
1980 adjustheap (periodics, periodiccnt, active);
1981 }
1982 }
1983
1984 ev_stop (EV_A_ (W)w);
1985 }
1986
1987 void noinline
1988 ev_periodic_again (EV_P_ ev_periodic *w)
1989 {
1990 /* TODO: use adjustheap and recalculation */
1991 ev_periodic_stop (EV_A_ w);
1992 ev_periodic_start (EV_A_ w);
1993 }
1994 #endif
1995
1996 #ifndef SA_RESTART
1997 # define SA_RESTART 0
1998 #endif
1999
2000 void noinline
2001 ev_signal_start (EV_P_ ev_signal *w)
2002 {
2003 #if EV_MULTIPLICITY
2004 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2005 #endif
2006 if (expect_false (ev_is_active (w)))
2007 return;
2008
2009 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2010
2011 evpipe_init (EV_A);
2012
2013 {
2014 #ifndef _WIN32
2015 sigset_t full, prev;
2016 sigfillset (&full);
2017 sigprocmask (SIG_SETMASK, &full, &prev);
2018 #endif
2019
2020 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2021
2022 #ifndef _WIN32
2023 sigprocmask (SIG_SETMASK, &prev, 0);
2024 #endif
2025 }
2026
2027 ev_start (EV_A_ (W)w, 1);
2028 wlist_add (&signals [w->signum - 1].head, (WL)w);
2029
2030 if (!((WL)w)->next)
2031 {
2032 #if _WIN32
2033 signal (w->signum, ev_sighandler);
2034 #else
2035 struct sigaction sa;
2036 sa.sa_handler = ev_sighandler;
2037 sigfillset (&sa.sa_mask);
2038 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2039 sigaction (w->signum, &sa, 0);
2040 #endif
2041 }
2042 }
2043
2044 void noinline
2045 ev_signal_stop (EV_P_ ev_signal *w)
2046 {
2047 clear_pending (EV_A_ (W)w);
2048 if (expect_false (!ev_is_active (w)))
2049 return;
2050
2051 wlist_del (&signals [w->signum - 1].head, (WL)w);
2052 ev_stop (EV_A_ (W)w);
2053
2054 if (!signals [w->signum - 1].head)
2055 signal (w->signum, SIG_DFL);
2056 }
2057
2058 void
2059 ev_child_start (EV_P_ ev_child *w)
2060 {
2061 #if EV_MULTIPLICITY
2062 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2063 #endif
2064 if (expect_false (ev_is_active (w)))
2065 return;
2066
2067 ev_start (EV_A_ (W)w, 1);
2068 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2069 }
2070
2071 void
2072 ev_child_stop (EV_P_ ev_child *w)
2073 {
2074 clear_pending (EV_A_ (W)w);
2075 if (expect_false (!ev_is_active (w)))
2076 return;
2077
2078 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2079 ev_stop (EV_A_ (W)w);
2080 }
2081
2082 #if EV_STAT_ENABLE
2083
2084 # ifdef _WIN32
2085 # undef lstat
2086 # define lstat(a,b) _stati64 (a,b)
2087 # endif
2088
2089 #define DEF_STAT_INTERVAL 5.0074891
2090 #define MIN_STAT_INTERVAL 0.1074891
2091
2092 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2093
2094 #if EV_USE_INOTIFY
2095 # define EV_INOTIFY_BUFSIZE 8192
2096
2097 static void noinline
2098 infy_add (EV_P_ ev_stat *w)
2099 {
2100 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);
2101
2102 if (w->wd < 0)
2103 {
2104 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2105
2106 /* monitor some parent directory for speedup hints */
2107 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2108 {
2109 char path [4096];
2110 strcpy (path, w->path);
2111
2112 do
2113 {
2114 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2115 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2116
2117 char *pend = strrchr (path, '/');
2118
2119 if (!pend)
2120 break; /* whoops, no '/', complain to your admin */
2121
2122 *pend = 0;
2123 w->wd = inotify_add_watch (fs_fd, path, mask);
2124 }
2125 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2126 }
2127 }
2128 else
2129 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2130
2131 if (w->wd >= 0)
2132 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2133 }
2134
2135 static void noinline
2136 infy_del (EV_P_ ev_stat *w)
2137 {
2138 int slot;
2139 int wd = w->wd;
2140
2141 if (wd < 0)
2142 return;
2143
2144 w->wd = -2;
2145 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2146 wlist_del (&fs_hash [slot].head, (WL)w);
2147
2148 /* remove this watcher, if others are watching it, they will rearm */
2149 inotify_rm_watch (fs_fd, wd);
2150 }
2151
2152 static void noinline
2153 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2154 {
2155 if (slot < 0)
2156 /* overflow, need to check for all hahs slots */
2157 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2158 infy_wd (EV_A_ slot, wd, ev);
2159 else
2160 {
2161 WL w_;
2162
2163 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2164 {
2165 ev_stat *w = (ev_stat *)w_;
2166 w_ = w_->next; /* lets us remove this watcher and all before it */
2167
2168 if (w->wd == wd || wd == -1)
2169 {
2170 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2171 {
2172 w->wd = -1;
2173 infy_add (EV_A_ w); /* re-add, no matter what */
2174 }
2175
2176 stat_timer_cb (EV_A_ &w->timer, 0);
2177 }
2178 }
2179 }
2180 }
2181
2182 static void
2183 infy_cb (EV_P_ ev_io *w, int revents)
2184 {
2185 char buf [EV_INOTIFY_BUFSIZE];
2186 struct inotify_event *ev = (struct inotify_event *)buf;
2187 int ofs;
2188 int len = read (fs_fd, buf, sizeof (buf));
2189
2190 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2191 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2192 }
2193
2194 void inline_size
2195 infy_init (EV_P)
2196 {
2197 if (fs_fd != -2)
2198 return;
2199
2200 fs_fd = inotify_init ();
2201
2202 if (fs_fd >= 0)
2203 {
2204 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2205 ev_set_priority (&fs_w, EV_MAXPRI);
2206 ev_io_start (EV_A_ &fs_w);
2207 }
2208 }
2209
2210 void inline_size
2211 infy_fork (EV_P)
2212 {
2213 int slot;
2214
2215 if (fs_fd < 0)
2216 return;
2217
2218 close (fs_fd);
2219 fs_fd = inotify_init ();
2220
2221 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2222 {
2223 WL w_ = fs_hash [slot].head;
2224 fs_hash [slot].head = 0;
2225
2226 while (w_)
2227 {
2228 ev_stat *w = (ev_stat *)w_;
2229 w_ = w_->next; /* lets us add this watcher */
2230
2231 w->wd = -1;
2232
2233 if (fs_fd >= 0)
2234 infy_add (EV_A_ w); /* re-add, no matter what */
2235 else
2236 ev_timer_start (EV_A_ &w->timer);
2237 }
2238
2239 }
2240 }
2241
2242 #endif
2243
2244 void
2245 ev_stat_stat (EV_P_ ev_stat *w)
2246 {
2247 if (lstat (w->path, &w->attr) < 0)
2248 w->attr.st_nlink = 0;
2249 else if (!w->attr.st_nlink)
2250 w->attr.st_nlink = 1;
2251 }
2252
2253 static void noinline
2254 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2255 {
2256 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2257
2258 /* we copy this here each the time so that */
2259 /* prev has the old value when the callback gets invoked */
2260 w->prev = w->attr;
2261 ev_stat_stat (EV_A_ w);
2262
2263 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2264 if (
2265 w->prev.st_dev != w->attr.st_dev
2266 || w->prev.st_ino != w->attr.st_ino
2267 || w->prev.st_mode != w->attr.st_mode
2268 || w->prev.st_nlink != w->attr.st_nlink
2269 || w->prev.st_uid != w->attr.st_uid
2270 || w->prev.st_gid != w->attr.st_gid
2271 || w->prev.st_rdev != w->attr.st_rdev
2272 || w->prev.st_size != w->attr.st_size
2273 || w->prev.st_atime != w->attr.st_atime
2274 || w->prev.st_mtime != w->attr.st_mtime
2275 || w->prev.st_ctime != w->attr.st_ctime
2276 ) {
2277 #if EV_USE_INOTIFY
2278 infy_del (EV_A_ w);
2279 infy_add (EV_A_ w);
2280 ev_stat_stat (EV_A_ w); /* avoid race... */
2281 #endif
2282
2283 ev_feed_event (EV_A_ w, EV_STAT);
2284 }
2285 }
2286
2287 void
2288 ev_stat_start (EV_P_ ev_stat *w)
2289 {
2290 if (expect_false (ev_is_active (w)))
2291 return;
2292
2293 /* since we use memcmp, we need to clear any padding data etc. */
2294 memset (&w->prev, 0, sizeof (ev_statdata));
2295 memset (&w->attr, 0, sizeof (ev_statdata));
2296
2297 ev_stat_stat (EV_A_ w);
2298
2299 if (w->interval < MIN_STAT_INTERVAL)
2300 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2301
2302 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2303 ev_set_priority (&w->timer, ev_priority (w));
2304
2305 #if EV_USE_INOTIFY
2306 infy_init (EV_A);
2307
2308 if (fs_fd >= 0)
2309 infy_add (EV_A_ w);
2310 else
2311 #endif
2312 ev_timer_start (EV_A_ &w->timer);
2313
2314 ev_start (EV_A_ (W)w, 1);
2315 }
2316
2317 void
2318 ev_stat_stop (EV_P_ ev_stat *w)
2319 {
2320 clear_pending (EV_A_ (W)w);
2321 if (expect_false (!ev_is_active (w)))
2322 return;
2323
2324 #if EV_USE_INOTIFY
2325 infy_del (EV_A_ w);
2326 #endif
2327 ev_timer_stop (EV_A_ &w->timer);
2328
2329 ev_stop (EV_A_ (W)w);
2330 }
2331 #endif
2332
2333 #if EV_IDLE_ENABLE
2334 void
2335 ev_idle_start (EV_P_ ev_idle *w)
2336 {
2337 if (expect_false (ev_is_active (w)))
2338 return;
2339
2340 pri_adjust (EV_A_ (W)w);
2341
2342 {
2343 int active = ++idlecnt [ABSPRI (w)];
2344
2345 ++idleall;
2346 ev_start (EV_A_ (W)w, active);
2347
2348 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2349 idles [ABSPRI (w)][active - 1] = w;
2350 }
2351 }
2352
2353 void
2354 ev_idle_stop (EV_P_ ev_idle *w)
2355 {
2356 clear_pending (EV_A_ (W)w);
2357 if (expect_false (!ev_is_active (w)))
2358 return;
2359
2360 {
2361 int active = ((W)w)->active;
2362
2363 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2364 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2365
2366 ev_stop (EV_A_ (W)w);
2367 --idleall;
2368 }
2369 }
2370 #endif
2371
2372 void
2373 ev_prepare_start (EV_P_ ev_prepare *w)
2374 {
2375 if (expect_false (ev_is_active (w)))
2376 return;
2377
2378 ev_start (EV_A_ (W)w, ++preparecnt);
2379 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2380 prepares [preparecnt - 1] = w;
2381 }
2382
2383 void
2384 ev_prepare_stop (EV_P_ ev_prepare *w)
2385 {
2386 clear_pending (EV_A_ (W)w);
2387 if (expect_false (!ev_is_active (w)))
2388 return;
2389
2390 {
2391 int active = ((W)w)->active;
2392 prepares [active - 1] = prepares [--preparecnt];
2393 ((W)prepares [active - 1])->active = active;
2394 }
2395
2396 ev_stop (EV_A_ (W)w);
2397 }
2398
2399 void
2400 ev_check_start (EV_P_ ev_check *w)
2401 {
2402 if (expect_false (ev_is_active (w)))
2403 return;
2404
2405 ev_start (EV_A_ (W)w, ++checkcnt);
2406 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2407 checks [checkcnt - 1] = w;
2408 }
2409
2410 void
2411 ev_check_stop (EV_P_ ev_check *w)
2412 {
2413 clear_pending (EV_A_ (W)w);
2414 if (expect_false (!ev_is_active (w)))
2415 return;
2416
2417 {
2418 int active = ((W)w)->active;
2419 checks [active - 1] = checks [--checkcnt];
2420 ((W)checks [active - 1])->active = active;
2421 }
2422
2423 ev_stop (EV_A_ (W)w);
2424 }
2425
2426 #if EV_EMBED_ENABLE
2427 void noinline
2428 ev_embed_sweep (EV_P_ ev_embed *w)
2429 {
2430 ev_loop (w->other, EVLOOP_NONBLOCK);
2431 }
2432
2433 static void
2434 embed_io_cb (EV_P_ ev_io *io, int revents)
2435 {
2436 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2437
2438 if (ev_cb (w))
2439 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2440 else
2441 ev_loop (w->other, EVLOOP_NONBLOCK);
2442 }
2443
2444 static void
2445 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2446 {
2447 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2448
2449 {
2450 struct ev_loop *loop = w->other;
2451
2452 while (fdchangecnt)
2453 {
2454 fd_reify (EV_A);
2455 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2456 }
2457 }
2458 }
2459
2460 #if 0
2461 static void
2462 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2463 {
2464 ev_idle_stop (EV_A_ idle);
2465 }
2466 #endif
2467
2468 void
2469 ev_embed_start (EV_P_ ev_embed *w)
2470 {
2471 if (expect_false (ev_is_active (w)))
2472 return;
2473
2474 {
2475 struct ev_loop *loop = w->other;
2476 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2477 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2478 }
2479
2480 ev_set_priority (&w->io, ev_priority (w));
2481 ev_io_start (EV_A_ &w->io);
2482
2483 ev_prepare_init (&w->prepare, embed_prepare_cb);
2484 ev_set_priority (&w->prepare, EV_MINPRI);
2485 ev_prepare_start (EV_A_ &w->prepare);
2486
2487 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2488
2489 ev_start (EV_A_ (W)w, 1);
2490 }
2491
2492 void
2493 ev_embed_stop (EV_P_ ev_embed *w)
2494 {
2495 clear_pending (EV_A_ (W)w);
2496 if (expect_false (!ev_is_active (w)))
2497 return;
2498
2499 ev_io_stop (EV_A_ &w->io);
2500 ev_prepare_stop (EV_A_ &w->prepare);
2501
2502 ev_stop (EV_A_ (W)w);
2503 }
2504 #endif
2505
2506 #if EV_FORK_ENABLE
2507 void
2508 ev_fork_start (EV_P_ ev_fork *w)
2509 {
2510 if (expect_false (ev_is_active (w)))
2511 return;
2512
2513 ev_start (EV_A_ (W)w, ++forkcnt);
2514 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2515 forks [forkcnt - 1] = w;
2516 }
2517
2518 void
2519 ev_fork_stop (EV_P_ ev_fork *w)
2520 {
2521 clear_pending (EV_A_ (W)w);
2522 if (expect_false (!ev_is_active (w)))
2523 return;
2524
2525 {
2526 int active = ((W)w)->active;
2527 forks [active - 1] = forks [--forkcnt];
2528 ((W)forks [active - 1])->active = active;
2529 }
2530
2531 ev_stop (EV_A_ (W)w);
2532 }
2533 #endif
2534
2535 #if EV_ASYNC_ENABLE
2536 void
2537 ev_async_start (EV_P_ ev_async *w)
2538 {
2539 if (expect_false (ev_is_active (w)))
2540 return;
2541
2542 evpipe_init (EV_A);
2543
2544 ev_start (EV_A_ (W)w, ++asynccnt);
2545 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2546 asyncs [asynccnt - 1] = w;
2547 }
2548
2549 void
2550 ev_async_stop (EV_P_ ev_async *w)
2551 {
2552 clear_pending (EV_A_ (W)w);
2553 if (expect_false (!ev_is_active (w)))
2554 return;
2555
2556 {
2557 int active = ((W)w)->active;
2558 asyncs [active - 1] = asyncs [--asynccnt];
2559 ((W)asyncs [active - 1])->active = active;
2560 }
2561
2562 ev_stop (EV_A_ (W)w);
2563 }
2564
2565 void
2566 ev_async_send (EV_P_ ev_async *w)
2567 {
2568 w->sent = 1;
2569 evpipe_write (EV_A_ &gotasync);
2570 }
2571 #endif
2572
2573 /*****************************************************************************/
2574
2575 struct ev_once
2576 {
2577 ev_io io;
2578 ev_timer to;
2579 void (*cb)(int revents, void *arg);
2580 void *arg;
2581 };
2582
2583 static void
2584 once_cb (EV_P_ struct ev_once *once, int revents)
2585 {
2586 void (*cb)(int revents, void *arg) = once->cb;
2587 void *arg = once->arg;
2588
2589 ev_io_stop (EV_A_ &once->io);
2590 ev_timer_stop (EV_A_ &once->to);
2591 ev_free (once);
2592
2593 cb (revents, arg);
2594 }
2595
2596 static void
2597 once_cb_io (EV_P_ ev_io *w, int revents)
2598 {
2599 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2600 }
2601
2602 static void
2603 once_cb_to (EV_P_ ev_timer *w, int revents)
2604 {
2605 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2606 }
2607
2608 void
2609 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2610 {
2611 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2612
2613 if (expect_false (!once))
2614 {
2615 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2616 return;
2617 }
2618
2619 once->cb = cb;
2620 once->arg = arg;
2621
2622 ev_init (&once->io, once_cb_io);
2623 if (fd >= 0)
2624 {
2625 ev_io_set (&once->io, fd, events);
2626 ev_io_start (EV_A_ &once->io);
2627 }
2628
2629 ev_init (&once->to, once_cb_to);
2630 if (timeout >= 0.)
2631 {
2632 ev_timer_set (&once->to, timeout, 0.);
2633 ev_timer_start (EV_A_ &once->to);
2634 }
2635 }
2636
2637 #if EV_MULTIPLICITY
2638 #include "ev_wrap.h"
2639 #endif
2640
2641 #ifdef __cplusplus
2642 }
2643 #endif
2644