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Revision: 1.273
Committed: Mon Nov 3 14:27:06 2008 UTC (15 years, 8 months ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: rel-3_49
Changes since 1.272: +53 -32 lines
Log Message:
*** empty log message ***

File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 /* this big block deduces configuration from config.h */
45 #ifndef EV_STANDALONE
46 # ifdef EV_CONFIG_H
47 # include EV_CONFIG_H
48 # else
49 # include "config.h"
50 # endif
51
52 # if HAVE_CLOCK_GETTIME
53 # ifndef EV_USE_MONOTONIC
54 # define EV_USE_MONOTONIC 1
55 # endif
56 # ifndef EV_USE_REALTIME
57 # define EV_USE_REALTIME 1
58 # endif
59 # else
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 0
62 # endif
63 # ifndef EV_USE_REALTIME
64 # define EV_USE_REALTIME 0
65 # endif
66 # endif
67
68 # ifndef EV_USE_NANOSLEEP
69 # if HAVE_NANOSLEEP
70 # define EV_USE_NANOSLEEP 1
71 # else
72 # define EV_USE_NANOSLEEP 0
73 # endif
74 # endif
75
76 # ifndef EV_USE_SELECT
77 # if HAVE_SELECT && HAVE_SYS_SELECT_H
78 # define EV_USE_SELECT 1
79 # else
80 # define EV_USE_SELECT 0
81 # endif
82 # endif
83
84 # ifndef EV_USE_POLL
85 # if HAVE_POLL && HAVE_POLL_H
86 # define EV_USE_POLL 1
87 # else
88 # define EV_USE_POLL 0
89 # endif
90 # endif
91
92 # ifndef EV_USE_EPOLL
93 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
94 # define EV_USE_EPOLL 1
95 # else
96 # define EV_USE_EPOLL 0
97 # endif
98 # endif
99
100 # ifndef EV_USE_KQUEUE
101 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
102 # define EV_USE_KQUEUE 1
103 # else
104 # define EV_USE_KQUEUE 0
105 # endif
106 # endif
107
108 # ifndef EV_USE_PORT
109 # if HAVE_PORT_H && HAVE_PORT_CREATE
110 # define EV_USE_PORT 1
111 # else
112 # define EV_USE_PORT 0
113 # endif
114 # endif
115
116 # ifndef EV_USE_INOTIFY
117 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
118 # define EV_USE_INOTIFY 1
119 # else
120 # define EV_USE_INOTIFY 0
121 # endif
122 # endif
123
124 # ifndef EV_USE_EVENTFD
125 # if HAVE_EVENTFD
126 # define EV_USE_EVENTFD 1
127 # else
128 # define EV_USE_EVENTFD 0
129 # endif
130 # endif
131
132 #endif
133
134 #include <math.h>
135 #include <stdlib.h>
136 #include <fcntl.h>
137 #include <stddef.h>
138
139 #include <stdio.h>
140
141 #include <assert.h>
142 #include <errno.h>
143 #include <sys/types.h>
144 #include <time.h>
145
146 #include <signal.h>
147
148 #ifdef EV_H
149 # include EV_H
150 #else
151 # include "ev.h"
152 #endif
153
154 #ifndef _WIN32
155 # include <sys/time.h>
156 # include <sys/wait.h>
157 # include <unistd.h>
158 #else
159 # include <io.h>
160 # define WIN32_LEAN_AND_MEAN
161 # include <windows.h>
162 # ifndef EV_SELECT_IS_WINSOCKET
163 # define EV_SELECT_IS_WINSOCKET 1
164 # endif
165 #endif
166
167 /* this block tries to deduce configuration from header-defined symbols and defaults */
168
169 #ifndef EV_USE_MONOTONIC
170 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
171 # define EV_USE_MONOTONIC 1
172 # else
173 # define EV_USE_MONOTONIC 0
174 # endif
175 #endif
176
177 #ifndef EV_USE_REALTIME
178 # define EV_USE_REALTIME 0
179 #endif
180
181 #ifndef EV_USE_NANOSLEEP
182 # if _POSIX_C_SOURCE >= 199309L
183 # define EV_USE_NANOSLEEP 1
184 # else
185 # define EV_USE_NANOSLEEP 0
186 # endif
187 #endif
188
189 #ifndef EV_USE_SELECT
190 # define EV_USE_SELECT 1
191 #endif
192
193 #ifndef EV_USE_POLL
194 # ifdef _WIN32
195 # define EV_USE_POLL 0
196 # else
197 # define EV_USE_POLL 1
198 # endif
199 #endif
200
201 #ifndef EV_USE_EPOLL
202 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
203 # define EV_USE_EPOLL 1
204 # else
205 # define EV_USE_EPOLL 0
206 # endif
207 #endif
208
209 #ifndef EV_USE_KQUEUE
210 # define EV_USE_KQUEUE 0
211 #endif
212
213 #ifndef EV_USE_PORT
214 # define EV_USE_PORT 0
215 #endif
216
217 #ifndef EV_USE_INOTIFY
218 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
219 # define EV_USE_INOTIFY 1
220 # else
221 # define EV_USE_INOTIFY 0
222 # endif
223 #endif
224
225 #ifndef EV_PID_HASHSIZE
226 # if EV_MINIMAL
227 # define EV_PID_HASHSIZE 1
228 # else
229 # define EV_PID_HASHSIZE 16
230 # endif
231 #endif
232
233 #ifndef EV_INOTIFY_HASHSIZE
234 # if EV_MINIMAL
235 # define EV_INOTIFY_HASHSIZE 1
236 # else
237 # define EV_INOTIFY_HASHSIZE 16
238 # endif
239 #endif
240
241 #ifndef EV_USE_EVENTFD
242 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
243 # define EV_USE_EVENTFD 1
244 # else
245 # define EV_USE_EVENTFD 0
246 # endif
247 #endif
248
249 #if 0 /* debugging */
250 # define EV_VERIFY 3
251 # define EV_USE_4HEAP 1
252 # define EV_HEAP_CACHE_AT 1
253 #endif
254
255 #ifndef EV_VERIFY
256 # define EV_VERIFY !EV_MINIMAL
257 #endif
258
259 #ifndef EV_USE_4HEAP
260 # define EV_USE_4HEAP !EV_MINIMAL
261 #endif
262
263 #ifndef EV_HEAP_CACHE_AT
264 # define EV_HEAP_CACHE_AT !EV_MINIMAL
265 #endif
266
267 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
268
269 #ifndef CLOCK_MONOTONIC
270 # undef EV_USE_MONOTONIC
271 # define EV_USE_MONOTONIC 0
272 #endif
273
274 #ifndef CLOCK_REALTIME
275 # undef EV_USE_REALTIME
276 # define EV_USE_REALTIME 0
277 #endif
278
279 #if !EV_STAT_ENABLE
280 # undef EV_USE_INOTIFY
281 # define EV_USE_INOTIFY 0
282 #endif
283
284 #if !EV_USE_NANOSLEEP
285 # ifndef _WIN32
286 # include <sys/select.h>
287 # endif
288 #endif
289
290 #if EV_USE_INOTIFY
291 # include <sys/utsname.h>
292 # include <sys/statfs.h>
293 # include <sys/inotify.h>
294 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
295 # ifndef IN_DONT_FOLLOW
296 # undef EV_USE_INOTIFY
297 # define EV_USE_INOTIFY 0
298 # endif
299 #endif
300
301 #if EV_SELECT_IS_WINSOCKET
302 # include <winsock.h>
303 #endif
304
305 #if EV_USE_EVENTFD
306 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
307 # include <stdint.h>
308 # ifdef __cplusplus
309 extern "C" {
310 # endif
311 int eventfd (unsigned int initval, int flags);
312 # ifdef __cplusplus
313 }
314 # endif
315 #endif
316
317 /**/
318
319 #if EV_VERIFY >= 3
320 # define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
321 #else
322 # define EV_FREQUENT_CHECK do { } while (0)
323 #endif
324
325 /*
326 * This is used to avoid floating point rounding problems.
327 * It is added to ev_rt_now when scheduling periodics
328 * to ensure progress, time-wise, even when rounding
329 * errors are against us.
330 * This value is good at least till the year 4000.
331 * Better solutions welcome.
332 */
333 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
334
335 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
336 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
337 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
338
339 #if __GNUC__ >= 4
340 # define expect(expr,value) __builtin_expect ((expr),(value))
341 # define noinline __attribute__ ((noinline))
342 #else
343 # define expect(expr,value) (expr)
344 # define noinline
345 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
346 # define inline
347 # endif
348 #endif
349
350 #define expect_false(expr) expect ((expr) != 0, 0)
351 #define expect_true(expr) expect ((expr) != 0, 1)
352 #define inline_size static inline
353
354 #if EV_MINIMAL
355 # define inline_speed static noinline
356 #else
357 # define inline_speed static inline
358 #endif
359
360 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
361 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
362
363 #define EMPTY /* required for microsofts broken pseudo-c compiler */
364 #define EMPTY2(a,b) /* used to suppress some warnings */
365
366 typedef ev_watcher *W;
367 typedef ev_watcher_list *WL;
368 typedef ev_watcher_time *WT;
369
370 #define ev_active(w) ((W)(w))->active
371 #define ev_at(w) ((WT)(w))->at
372
373 #if EV_USE_MONOTONIC
374 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
375 /* giving it a reasonably high chance of working on typical architetcures */
376 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
377 #endif
378
379 #ifdef _WIN32
380 # include "ev_win32.c"
381 #endif
382
383 /*****************************************************************************/
384
385 static void (*syserr_cb)(const char *msg);
386
387 void
388 ev_set_syserr_cb (void (*cb)(const char *msg))
389 {
390 syserr_cb = cb;
391 }
392
393 static void noinline
394 ev_syserr (const char *msg)
395 {
396 if (!msg)
397 msg = "(libev) system error";
398
399 if (syserr_cb)
400 syserr_cb (msg);
401 else
402 {
403 perror (msg);
404 abort ();
405 }
406 }
407
408 static void *
409 ev_realloc_emul (void *ptr, long size)
410 {
411 /* some systems, notably openbsd and darwin, fail to properly
412 * implement realloc (x, 0) (as required by both ansi c-98 and
413 * the single unix specification, so work around them here.
414 */
415
416 if (size)
417 return realloc (ptr, size);
418
419 free (ptr);
420 return 0;
421 }
422
423 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
424
425 void
426 ev_set_allocator (void *(*cb)(void *ptr, long size))
427 {
428 alloc = cb;
429 }
430
431 inline_speed void *
432 ev_realloc (void *ptr, long size)
433 {
434 ptr = alloc (ptr, size);
435
436 if (!ptr && size)
437 {
438 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
439 abort ();
440 }
441
442 return ptr;
443 }
444
445 #define ev_malloc(size) ev_realloc (0, (size))
446 #define ev_free(ptr) ev_realloc ((ptr), 0)
447
448 /*****************************************************************************/
449
450 typedef struct
451 {
452 WL head;
453 unsigned char events;
454 unsigned char reify;
455 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
456 unsigned char unused;
457 #if EV_USE_EPOLL
458 unsigned int egen; /* generation counter to counter epoll bugs */
459 #endif
460 #if EV_SELECT_IS_WINSOCKET
461 SOCKET handle;
462 #endif
463 } ANFD;
464
465 typedef struct
466 {
467 W w;
468 int events;
469 } ANPENDING;
470
471 #if EV_USE_INOTIFY
472 /* hash table entry per inotify-id */
473 typedef struct
474 {
475 WL head;
476 } ANFS;
477 #endif
478
479 /* Heap Entry */
480 #if EV_HEAP_CACHE_AT
481 typedef struct {
482 ev_tstamp at;
483 WT w;
484 } ANHE;
485
486 #define ANHE_w(he) (he).w /* access watcher, read-write */
487 #define ANHE_at(he) (he).at /* access cached at, read-only */
488 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
489 #else
490 typedef WT ANHE;
491
492 #define ANHE_w(he) (he)
493 #define ANHE_at(he) (he)->at
494 #define ANHE_at_cache(he)
495 #endif
496
497 #if EV_MULTIPLICITY
498
499 struct ev_loop
500 {
501 ev_tstamp ev_rt_now;
502 #define ev_rt_now ((loop)->ev_rt_now)
503 #define VAR(name,decl) decl;
504 #include "ev_vars.h"
505 #undef VAR
506 };
507 #include "ev_wrap.h"
508
509 static struct ev_loop default_loop_struct;
510 struct ev_loop *ev_default_loop_ptr;
511
512 #else
513
514 ev_tstamp ev_rt_now;
515 #define VAR(name,decl) static decl;
516 #include "ev_vars.h"
517 #undef VAR
518
519 static int ev_default_loop_ptr;
520
521 #endif
522
523 /*****************************************************************************/
524
525 ev_tstamp
526 ev_time (void)
527 {
528 #if EV_USE_REALTIME
529 struct timespec ts;
530 clock_gettime (CLOCK_REALTIME, &ts);
531 return ts.tv_sec + ts.tv_nsec * 1e-9;
532 #else
533 struct timeval tv;
534 gettimeofday (&tv, 0);
535 return tv.tv_sec + tv.tv_usec * 1e-6;
536 #endif
537 }
538
539 ev_tstamp inline_size
540 get_clock (void)
541 {
542 #if EV_USE_MONOTONIC
543 if (expect_true (have_monotonic))
544 {
545 struct timespec ts;
546 clock_gettime (CLOCK_MONOTONIC, &ts);
547 return ts.tv_sec + ts.tv_nsec * 1e-9;
548 }
549 #endif
550
551 return ev_time ();
552 }
553
554 #if EV_MULTIPLICITY
555 ev_tstamp
556 ev_now (EV_P)
557 {
558 return ev_rt_now;
559 }
560 #endif
561
562 void
563 ev_sleep (ev_tstamp delay)
564 {
565 if (delay > 0.)
566 {
567 #if EV_USE_NANOSLEEP
568 struct timespec ts;
569
570 ts.tv_sec = (time_t)delay;
571 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
572
573 nanosleep (&ts, 0);
574 #elif defined(_WIN32)
575 Sleep ((unsigned long)(delay * 1e3));
576 #else
577 struct timeval tv;
578
579 tv.tv_sec = (time_t)delay;
580 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
581
582 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
583 /* somehting nto guaranteed by newer posix versions, but guaranteed */
584 /* by older ones */
585 select (0, 0, 0, 0, &tv);
586 #endif
587 }
588 }
589
590 /*****************************************************************************/
591
592 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
593
594 int inline_size
595 array_nextsize (int elem, int cur, int cnt)
596 {
597 int ncur = cur + 1;
598
599 do
600 ncur <<= 1;
601 while (cnt > ncur);
602
603 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
604 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
605 {
606 ncur *= elem;
607 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
608 ncur = ncur - sizeof (void *) * 4;
609 ncur /= elem;
610 }
611
612 return ncur;
613 }
614
615 static noinline void *
616 array_realloc (int elem, void *base, int *cur, int cnt)
617 {
618 *cur = array_nextsize (elem, *cur, cnt);
619 return ev_realloc (base, elem * *cur);
620 }
621
622 #define array_init_zero(base,count) \
623 memset ((void *)(base), 0, sizeof (*(base)) * (count))
624
625 #define array_needsize(type,base,cur,cnt,init) \
626 if (expect_false ((cnt) > (cur))) \
627 { \
628 int ocur_ = (cur); \
629 (base) = (type *)array_realloc \
630 (sizeof (type), (base), &(cur), (cnt)); \
631 init ((base) + (ocur_), (cur) - ocur_); \
632 }
633
634 #if 0
635 #define array_slim(type,stem) \
636 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
637 { \
638 stem ## max = array_roundsize (stem ## cnt >> 1); \
639 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
640 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
641 }
642 #endif
643
644 #define array_free(stem, idx) \
645 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
646
647 /*****************************************************************************/
648
649 void noinline
650 ev_feed_event (EV_P_ void *w, int revents)
651 {
652 W w_ = (W)w;
653 int pri = ABSPRI (w_);
654
655 if (expect_false (w_->pending))
656 pendings [pri][w_->pending - 1].events |= revents;
657 else
658 {
659 w_->pending = ++pendingcnt [pri];
660 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
661 pendings [pri][w_->pending - 1].w = w_;
662 pendings [pri][w_->pending - 1].events = revents;
663 }
664 }
665
666 void inline_speed
667 queue_events (EV_P_ W *events, int eventcnt, int type)
668 {
669 int i;
670
671 for (i = 0; i < eventcnt; ++i)
672 ev_feed_event (EV_A_ events [i], type);
673 }
674
675 /*****************************************************************************/
676
677 void inline_speed
678 fd_event (EV_P_ int fd, int revents)
679 {
680 ANFD *anfd = anfds + fd;
681 ev_io *w;
682
683 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
684 {
685 int ev = w->events & revents;
686
687 if (ev)
688 ev_feed_event (EV_A_ (W)w, ev);
689 }
690 }
691
692 void
693 ev_feed_fd_event (EV_P_ int fd, int revents)
694 {
695 if (fd >= 0 && fd < anfdmax)
696 fd_event (EV_A_ fd, revents);
697 }
698
699 void inline_size
700 fd_reify (EV_P)
701 {
702 int i;
703
704 for (i = 0; i < fdchangecnt; ++i)
705 {
706 int fd = fdchanges [i];
707 ANFD *anfd = anfds + fd;
708 ev_io *w;
709
710 unsigned char events = 0;
711
712 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
713 events |= (unsigned char)w->events;
714
715 #if EV_SELECT_IS_WINSOCKET
716 if (events)
717 {
718 unsigned long arg;
719 #ifdef EV_FD_TO_WIN32_HANDLE
720 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
721 #else
722 anfd->handle = _get_osfhandle (fd);
723 #endif
724 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
725 }
726 #endif
727
728 {
729 unsigned char o_events = anfd->events;
730 unsigned char o_reify = anfd->reify;
731
732 anfd->reify = 0;
733 anfd->events = events;
734
735 if (o_events != events || o_reify & EV_IOFDSET)
736 backend_modify (EV_A_ fd, o_events, events);
737 }
738 }
739
740 fdchangecnt = 0;
741 }
742
743 void inline_size
744 fd_change (EV_P_ int fd, int flags)
745 {
746 unsigned char reify = anfds [fd].reify;
747 anfds [fd].reify |= flags;
748
749 if (expect_true (!reify))
750 {
751 ++fdchangecnt;
752 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
753 fdchanges [fdchangecnt - 1] = fd;
754 }
755 }
756
757 void inline_speed
758 fd_kill (EV_P_ int fd)
759 {
760 ev_io *w;
761
762 while ((w = (ev_io *)anfds [fd].head))
763 {
764 ev_io_stop (EV_A_ w);
765 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
766 }
767 }
768
769 int inline_size
770 fd_valid (int fd)
771 {
772 #ifdef _WIN32
773 return _get_osfhandle (fd) != -1;
774 #else
775 return fcntl (fd, F_GETFD) != -1;
776 #endif
777 }
778
779 /* called on EBADF to verify fds */
780 static void noinline
781 fd_ebadf (EV_P)
782 {
783 int fd;
784
785 for (fd = 0; fd < anfdmax; ++fd)
786 if (anfds [fd].events)
787 if (!fd_valid (fd) && errno == EBADF)
788 fd_kill (EV_A_ fd);
789 }
790
791 /* called on ENOMEM in select/poll to kill some fds and retry */
792 static void noinline
793 fd_enomem (EV_P)
794 {
795 int fd;
796
797 for (fd = anfdmax; fd--; )
798 if (anfds [fd].events)
799 {
800 fd_kill (EV_A_ fd);
801 return;
802 }
803 }
804
805 /* usually called after fork if backend needs to re-arm all fds from scratch */
806 static void noinline
807 fd_rearm_all (EV_P)
808 {
809 int fd;
810
811 for (fd = 0; fd < anfdmax; ++fd)
812 if (anfds [fd].events)
813 {
814 anfds [fd].events = 0;
815 anfds [fd].emask = 0;
816 fd_change (EV_A_ fd, EV_IOFDSET | 1);
817 }
818 }
819
820 /*****************************************************************************/
821
822 /*
823 * the heap functions want a real array index. array index 0 uis guaranteed to not
824 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
825 * the branching factor of the d-tree.
826 */
827
828 /*
829 * at the moment we allow libev the luxury of two heaps,
830 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
831 * which is more cache-efficient.
832 * the difference is about 5% with 50000+ watchers.
833 */
834 #if EV_USE_4HEAP
835
836 #define DHEAP 4
837 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
838 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
839 #define UPHEAP_DONE(p,k) ((p) == (k))
840
841 /* away from the root */
842 void inline_speed
843 downheap (ANHE *heap, int N, int k)
844 {
845 ANHE he = heap [k];
846 ANHE *E = heap + N + HEAP0;
847
848 for (;;)
849 {
850 ev_tstamp minat;
851 ANHE *minpos;
852 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
853
854 /* find minimum child */
855 if (expect_true (pos + DHEAP - 1 < E))
856 {
857 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
858 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
859 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
860 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
861 }
862 else if (pos < E)
863 {
864 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
865 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
866 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
867 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
868 }
869 else
870 break;
871
872 if (ANHE_at (he) <= minat)
873 break;
874
875 heap [k] = *minpos;
876 ev_active (ANHE_w (*minpos)) = k;
877
878 k = minpos - heap;
879 }
880
881 heap [k] = he;
882 ev_active (ANHE_w (he)) = k;
883 }
884
885 #else /* 4HEAP */
886
887 #define HEAP0 1
888 #define HPARENT(k) ((k) >> 1)
889 #define UPHEAP_DONE(p,k) (!(p))
890
891 /* away from the root */
892 void inline_speed
893 downheap (ANHE *heap, int N, int k)
894 {
895 ANHE he = heap [k];
896
897 for (;;)
898 {
899 int c = k << 1;
900
901 if (c > N + HEAP0 - 1)
902 break;
903
904 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
905 ? 1 : 0;
906
907 if (ANHE_at (he) <= ANHE_at (heap [c]))
908 break;
909
910 heap [k] = heap [c];
911 ev_active (ANHE_w (heap [k])) = k;
912
913 k = c;
914 }
915
916 heap [k] = he;
917 ev_active (ANHE_w (he)) = k;
918 }
919 #endif
920
921 /* towards the root */
922 void inline_speed
923 upheap (ANHE *heap, int k)
924 {
925 ANHE he = heap [k];
926
927 for (;;)
928 {
929 int p = HPARENT (k);
930
931 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
932 break;
933
934 heap [k] = heap [p];
935 ev_active (ANHE_w (heap [k])) = k;
936 k = p;
937 }
938
939 heap [k] = he;
940 ev_active (ANHE_w (he)) = k;
941 }
942
943 void inline_size
944 adjustheap (ANHE *heap, int N, int k)
945 {
946 if (k > HEAP0 && ANHE_at (heap [HPARENT (k)]) >= ANHE_at (heap [k]))
947 upheap (heap, k);
948 else
949 downheap (heap, N, k);
950 }
951
952 /* rebuild the heap: this function is used only once and executed rarely */
953 void inline_size
954 reheap (ANHE *heap, int N)
955 {
956 int i;
957
958 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
959 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
960 for (i = 0; i < N; ++i)
961 upheap (heap, i + HEAP0);
962 }
963
964 /*****************************************************************************/
965
966 typedef struct
967 {
968 WL head;
969 EV_ATOMIC_T gotsig;
970 } ANSIG;
971
972 static ANSIG *signals;
973 static int signalmax;
974
975 static EV_ATOMIC_T gotsig;
976
977 /*****************************************************************************/
978
979 void inline_speed
980 fd_intern (int fd)
981 {
982 #ifdef _WIN32
983 unsigned long arg = 1;
984 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
985 #else
986 fcntl (fd, F_SETFD, FD_CLOEXEC);
987 fcntl (fd, F_SETFL, O_NONBLOCK);
988 #endif
989 }
990
991 static void noinline
992 evpipe_init (EV_P)
993 {
994 if (!ev_is_active (&pipeev))
995 {
996 #if EV_USE_EVENTFD
997 if ((evfd = eventfd (0, 0)) >= 0)
998 {
999 evpipe [0] = -1;
1000 fd_intern (evfd);
1001 ev_io_set (&pipeev, evfd, EV_READ);
1002 }
1003 else
1004 #endif
1005 {
1006 while (pipe (evpipe))
1007 ev_syserr ("(libev) error creating signal/async pipe");
1008
1009 fd_intern (evpipe [0]);
1010 fd_intern (evpipe [1]);
1011 ev_io_set (&pipeev, evpipe [0], EV_READ);
1012 }
1013
1014 ev_io_start (EV_A_ &pipeev);
1015 ev_unref (EV_A); /* watcher should not keep loop alive */
1016 }
1017 }
1018
1019 void inline_size
1020 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1021 {
1022 if (!*flag)
1023 {
1024 int old_errno = errno; /* save errno because write might clobber it */
1025
1026 *flag = 1;
1027
1028 #if EV_USE_EVENTFD
1029 if (evfd >= 0)
1030 {
1031 uint64_t counter = 1;
1032 write (evfd, &counter, sizeof (uint64_t));
1033 }
1034 else
1035 #endif
1036 write (evpipe [1], &old_errno, 1);
1037
1038 errno = old_errno;
1039 }
1040 }
1041
1042 static void
1043 pipecb (EV_P_ ev_io *iow, int revents)
1044 {
1045 #if EV_USE_EVENTFD
1046 if (evfd >= 0)
1047 {
1048 uint64_t counter;
1049 read (evfd, &counter, sizeof (uint64_t));
1050 }
1051 else
1052 #endif
1053 {
1054 char dummy;
1055 read (evpipe [0], &dummy, 1);
1056 }
1057
1058 if (gotsig && ev_is_default_loop (EV_A))
1059 {
1060 int signum;
1061 gotsig = 0;
1062
1063 for (signum = signalmax; signum--; )
1064 if (signals [signum].gotsig)
1065 ev_feed_signal_event (EV_A_ signum + 1);
1066 }
1067
1068 #if EV_ASYNC_ENABLE
1069 if (gotasync)
1070 {
1071 int i;
1072 gotasync = 0;
1073
1074 for (i = asynccnt; i--; )
1075 if (asyncs [i]->sent)
1076 {
1077 asyncs [i]->sent = 0;
1078 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1079 }
1080 }
1081 #endif
1082 }
1083
1084 /*****************************************************************************/
1085
1086 static void
1087 ev_sighandler (int signum)
1088 {
1089 #if EV_MULTIPLICITY
1090 struct ev_loop *loop = &default_loop_struct;
1091 #endif
1092
1093 #if _WIN32
1094 signal (signum, ev_sighandler);
1095 #endif
1096
1097 signals [signum - 1].gotsig = 1;
1098 evpipe_write (EV_A_ &gotsig);
1099 }
1100
1101 void noinline
1102 ev_feed_signal_event (EV_P_ int signum)
1103 {
1104 WL w;
1105
1106 #if EV_MULTIPLICITY
1107 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1108 #endif
1109
1110 --signum;
1111
1112 if (signum < 0 || signum >= signalmax)
1113 return;
1114
1115 signals [signum].gotsig = 0;
1116
1117 for (w = signals [signum].head; w; w = w->next)
1118 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1119 }
1120
1121 /*****************************************************************************/
1122
1123 static WL childs [EV_PID_HASHSIZE];
1124
1125 #ifndef _WIN32
1126
1127 static ev_signal childev;
1128
1129 #ifndef WIFCONTINUED
1130 # define WIFCONTINUED(status) 0
1131 #endif
1132
1133 void inline_speed
1134 child_reap (EV_P_ int chain, int pid, int status)
1135 {
1136 ev_child *w;
1137 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1138
1139 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1140 {
1141 if ((w->pid == pid || !w->pid)
1142 && (!traced || (w->flags & 1)))
1143 {
1144 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1145 w->rpid = pid;
1146 w->rstatus = status;
1147 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1148 }
1149 }
1150 }
1151
1152 #ifndef WCONTINUED
1153 # define WCONTINUED 0
1154 #endif
1155
1156 static void
1157 childcb (EV_P_ ev_signal *sw, int revents)
1158 {
1159 int pid, status;
1160
1161 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1162 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1163 if (!WCONTINUED
1164 || errno != EINVAL
1165 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1166 return;
1167
1168 /* make sure we are called again until all children have been reaped */
1169 /* we need to do it this way so that the callback gets called before we continue */
1170 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1171
1172 child_reap (EV_A_ pid, pid, status);
1173 if (EV_PID_HASHSIZE > 1)
1174 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1175 }
1176
1177 #endif
1178
1179 /*****************************************************************************/
1180
1181 #if EV_USE_PORT
1182 # include "ev_port.c"
1183 #endif
1184 #if EV_USE_KQUEUE
1185 # include "ev_kqueue.c"
1186 #endif
1187 #if EV_USE_EPOLL
1188 # include "ev_epoll.c"
1189 #endif
1190 #if EV_USE_POLL
1191 # include "ev_poll.c"
1192 #endif
1193 #if EV_USE_SELECT
1194 # include "ev_select.c"
1195 #endif
1196
1197 int
1198 ev_version_major (void)
1199 {
1200 return EV_VERSION_MAJOR;
1201 }
1202
1203 int
1204 ev_version_minor (void)
1205 {
1206 return EV_VERSION_MINOR;
1207 }
1208
1209 /* return true if we are running with elevated privileges and should ignore env variables */
1210 int inline_size
1211 enable_secure (void)
1212 {
1213 #ifdef _WIN32
1214 return 0;
1215 #else
1216 return getuid () != geteuid ()
1217 || getgid () != getegid ();
1218 #endif
1219 }
1220
1221 unsigned int
1222 ev_supported_backends (void)
1223 {
1224 unsigned int flags = 0;
1225
1226 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1227 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1228 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1229 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1230 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1231
1232 return flags;
1233 }
1234
1235 unsigned int
1236 ev_recommended_backends (void)
1237 {
1238 unsigned int flags = ev_supported_backends ();
1239
1240 #ifndef __NetBSD__
1241 /* kqueue is borked on everything but netbsd apparently */
1242 /* it usually doesn't work correctly on anything but sockets and pipes */
1243 flags &= ~EVBACKEND_KQUEUE;
1244 #endif
1245 #ifdef __APPLE__
1246 // flags &= ~EVBACKEND_KQUEUE; for documentation
1247 flags &= ~EVBACKEND_POLL;
1248 #endif
1249
1250 return flags;
1251 }
1252
1253 unsigned int
1254 ev_embeddable_backends (void)
1255 {
1256 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1257
1258 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1259 /* please fix it and tell me how to detect the fix */
1260 flags &= ~EVBACKEND_EPOLL;
1261
1262 return flags;
1263 }
1264
1265 unsigned int
1266 ev_backend (EV_P)
1267 {
1268 return backend;
1269 }
1270
1271 unsigned int
1272 ev_loop_count (EV_P)
1273 {
1274 return loop_count;
1275 }
1276
1277 void
1278 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1279 {
1280 io_blocktime = interval;
1281 }
1282
1283 void
1284 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1285 {
1286 timeout_blocktime = interval;
1287 }
1288
1289 static void noinline
1290 loop_init (EV_P_ unsigned int flags)
1291 {
1292 if (!backend)
1293 {
1294 #if EV_USE_MONOTONIC
1295 {
1296 struct timespec ts;
1297 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1298 have_monotonic = 1;
1299 }
1300 #endif
1301
1302 ev_rt_now = ev_time ();
1303 mn_now = get_clock ();
1304 now_floor = mn_now;
1305 rtmn_diff = ev_rt_now - mn_now;
1306
1307 io_blocktime = 0.;
1308 timeout_blocktime = 0.;
1309 backend = 0;
1310 backend_fd = -1;
1311 gotasync = 0;
1312 #if EV_USE_INOTIFY
1313 fs_fd = -2;
1314 #endif
1315
1316 /* pid check not overridable via env */
1317 #ifndef _WIN32
1318 if (flags & EVFLAG_FORKCHECK)
1319 curpid = getpid ();
1320 #endif
1321
1322 if (!(flags & EVFLAG_NOENV)
1323 && !enable_secure ()
1324 && getenv ("LIBEV_FLAGS"))
1325 flags = atoi (getenv ("LIBEV_FLAGS"));
1326
1327 if (!(flags & 0x0000ffffU))
1328 flags |= ev_recommended_backends ();
1329
1330 #if EV_USE_PORT
1331 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1332 #endif
1333 #if EV_USE_KQUEUE
1334 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1335 #endif
1336 #if EV_USE_EPOLL
1337 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1338 #endif
1339 #if EV_USE_POLL
1340 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1341 #endif
1342 #if EV_USE_SELECT
1343 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1344 #endif
1345
1346 ev_init (&pipeev, pipecb);
1347 ev_set_priority (&pipeev, EV_MAXPRI);
1348 }
1349 }
1350
1351 static void noinline
1352 loop_destroy (EV_P)
1353 {
1354 int i;
1355
1356 if (ev_is_active (&pipeev))
1357 {
1358 ev_ref (EV_A); /* signal watcher */
1359 ev_io_stop (EV_A_ &pipeev);
1360
1361 #if EV_USE_EVENTFD
1362 if (evfd >= 0)
1363 close (evfd);
1364 #endif
1365
1366 if (evpipe [0] >= 0)
1367 {
1368 close (evpipe [0]);
1369 close (evpipe [1]);
1370 }
1371 }
1372
1373 #if EV_USE_INOTIFY
1374 if (fs_fd >= 0)
1375 close (fs_fd);
1376 #endif
1377
1378 if (backend_fd >= 0)
1379 close (backend_fd);
1380
1381 #if EV_USE_PORT
1382 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1383 #endif
1384 #if EV_USE_KQUEUE
1385 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1386 #endif
1387 #if EV_USE_EPOLL
1388 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1389 #endif
1390 #if EV_USE_POLL
1391 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1392 #endif
1393 #if EV_USE_SELECT
1394 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1395 #endif
1396
1397 for (i = NUMPRI; i--; )
1398 {
1399 array_free (pending, [i]);
1400 #if EV_IDLE_ENABLE
1401 array_free (idle, [i]);
1402 #endif
1403 }
1404
1405 ev_free (anfds); anfdmax = 0;
1406
1407 /* have to use the microsoft-never-gets-it-right macro */
1408 array_free (fdchange, EMPTY);
1409 array_free (timer, EMPTY);
1410 #if EV_PERIODIC_ENABLE
1411 array_free (periodic, EMPTY);
1412 #endif
1413 #if EV_FORK_ENABLE
1414 array_free (fork, EMPTY);
1415 #endif
1416 array_free (prepare, EMPTY);
1417 array_free (check, EMPTY);
1418 #if EV_ASYNC_ENABLE
1419 array_free (async, EMPTY);
1420 #endif
1421
1422 backend = 0;
1423 }
1424
1425 #if EV_USE_INOTIFY
1426 void inline_size infy_fork (EV_P);
1427 #endif
1428
1429 void inline_size
1430 loop_fork (EV_P)
1431 {
1432 #if EV_USE_PORT
1433 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1434 #endif
1435 #if EV_USE_KQUEUE
1436 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1437 #endif
1438 #if EV_USE_EPOLL
1439 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1440 #endif
1441 #if EV_USE_INOTIFY
1442 infy_fork (EV_A);
1443 #endif
1444
1445 if (ev_is_active (&pipeev))
1446 {
1447 /* this "locks" the handlers against writing to the pipe */
1448 /* while we modify the fd vars */
1449 gotsig = 1;
1450 #if EV_ASYNC_ENABLE
1451 gotasync = 1;
1452 #endif
1453
1454 ev_ref (EV_A);
1455 ev_io_stop (EV_A_ &pipeev);
1456
1457 #if EV_USE_EVENTFD
1458 if (evfd >= 0)
1459 close (evfd);
1460 #endif
1461
1462 if (evpipe [0] >= 0)
1463 {
1464 close (evpipe [0]);
1465 close (evpipe [1]);
1466 }
1467
1468 evpipe_init (EV_A);
1469 /* now iterate over everything, in case we missed something */
1470 pipecb (EV_A_ &pipeev, EV_READ);
1471 }
1472
1473 postfork = 0;
1474 }
1475
1476 #if EV_MULTIPLICITY
1477
1478 struct ev_loop *
1479 ev_loop_new (unsigned int flags)
1480 {
1481 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1482
1483 memset (loop, 0, sizeof (struct ev_loop));
1484
1485 loop_init (EV_A_ flags);
1486
1487 if (ev_backend (EV_A))
1488 return loop;
1489
1490 return 0;
1491 }
1492
1493 void
1494 ev_loop_destroy (EV_P)
1495 {
1496 loop_destroy (EV_A);
1497 ev_free (loop);
1498 }
1499
1500 void
1501 ev_loop_fork (EV_P)
1502 {
1503 postfork = 1; /* must be in line with ev_default_fork */
1504 }
1505
1506 #if EV_VERIFY
1507 static void noinline
1508 verify_watcher (EV_P_ W w)
1509 {
1510 assert (("watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1511
1512 if (w->pending)
1513 assert (("pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1514 }
1515
1516 static void noinline
1517 verify_heap (EV_P_ ANHE *heap, int N)
1518 {
1519 int i;
1520
1521 for (i = HEAP0; i < N + HEAP0; ++i)
1522 {
1523 assert (("active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1524 assert (("heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1525 assert (("heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1526
1527 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1528 }
1529 }
1530
1531 static void noinline
1532 array_verify (EV_P_ W *ws, int cnt)
1533 {
1534 while (cnt--)
1535 {
1536 assert (("active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1537 verify_watcher (EV_A_ ws [cnt]);
1538 }
1539 }
1540 #endif
1541
1542 void
1543 ev_loop_verify (EV_P)
1544 {
1545 #if EV_VERIFY
1546 int i;
1547 WL w;
1548
1549 assert (activecnt >= -1);
1550
1551 assert (fdchangemax >= fdchangecnt);
1552 for (i = 0; i < fdchangecnt; ++i)
1553 assert (("negative fd in fdchanges", fdchanges [i] >= 0));
1554
1555 assert (anfdmax >= 0);
1556 for (i = 0; i < anfdmax; ++i)
1557 for (w = anfds [i].head; w; w = w->next)
1558 {
1559 verify_watcher (EV_A_ (W)w);
1560 assert (("inactive fd watcher on anfd list", ev_active (w) == 1));
1561 assert (("fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1562 }
1563
1564 assert (timermax >= timercnt);
1565 verify_heap (EV_A_ timers, timercnt);
1566
1567 #if EV_PERIODIC_ENABLE
1568 assert (periodicmax >= periodiccnt);
1569 verify_heap (EV_A_ periodics, periodiccnt);
1570 #endif
1571
1572 for (i = NUMPRI; i--; )
1573 {
1574 assert (pendingmax [i] >= pendingcnt [i]);
1575 #if EV_IDLE_ENABLE
1576 assert (idleall >= 0);
1577 assert (idlemax [i] >= idlecnt [i]);
1578 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1579 #endif
1580 }
1581
1582 #if EV_FORK_ENABLE
1583 assert (forkmax >= forkcnt);
1584 array_verify (EV_A_ (W *)forks, forkcnt);
1585 #endif
1586
1587 #if EV_ASYNC_ENABLE
1588 assert (asyncmax >= asynccnt);
1589 array_verify (EV_A_ (W *)asyncs, asynccnt);
1590 #endif
1591
1592 assert (preparemax >= preparecnt);
1593 array_verify (EV_A_ (W *)prepares, preparecnt);
1594
1595 assert (checkmax >= checkcnt);
1596 array_verify (EV_A_ (W *)checks, checkcnt);
1597
1598 # if 0
1599 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1600 for (signum = signalmax; signum--; ) if (signals [signum].gotsig)
1601 # endif
1602 #endif
1603 }
1604
1605 #endif /* multiplicity */
1606
1607 #if EV_MULTIPLICITY
1608 struct ev_loop *
1609 ev_default_loop_init (unsigned int flags)
1610 #else
1611 int
1612 ev_default_loop (unsigned int flags)
1613 #endif
1614 {
1615 if (!ev_default_loop_ptr)
1616 {
1617 #if EV_MULTIPLICITY
1618 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1619 #else
1620 ev_default_loop_ptr = 1;
1621 #endif
1622
1623 loop_init (EV_A_ flags);
1624
1625 if (ev_backend (EV_A))
1626 {
1627 #ifndef _WIN32
1628 ev_signal_init (&childev, childcb, SIGCHLD);
1629 ev_set_priority (&childev, EV_MAXPRI);
1630 ev_signal_start (EV_A_ &childev);
1631 ev_unref (EV_A); /* child watcher should not keep loop alive */
1632 #endif
1633 }
1634 else
1635 ev_default_loop_ptr = 0;
1636 }
1637
1638 return ev_default_loop_ptr;
1639 }
1640
1641 void
1642 ev_default_destroy (void)
1643 {
1644 #if EV_MULTIPLICITY
1645 struct ev_loop *loop = ev_default_loop_ptr;
1646 #endif
1647
1648 ev_default_loop_ptr = 0;
1649
1650 #ifndef _WIN32
1651 ev_ref (EV_A); /* child watcher */
1652 ev_signal_stop (EV_A_ &childev);
1653 #endif
1654
1655 loop_destroy (EV_A);
1656 }
1657
1658 void
1659 ev_default_fork (void)
1660 {
1661 #if EV_MULTIPLICITY
1662 struct ev_loop *loop = ev_default_loop_ptr;
1663 #endif
1664
1665 postfork = 1; /* must be in line with ev_loop_fork */
1666 }
1667
1668 /*****************************************************************************/
1669
1670 void
1671 ev_invoke (EV_P_ void *w, int revents)
1672 {
1673 EV_CB_INVOKE ((W)w, revents);
1674 }
1675
1676 void inline_speed
1677 call_pending (EV_P)
1678 {
1679 int pri;
1680
1681 for (pri = NUMPRI; pri--; )
1682 while (pendingcnt [pri])
1683 {
1684 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1685
1686 if (expect_true (p->w))
1687 {
1688 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1689
1690 p->w->pending = 0;
1691 EV_CB_INVOKE (p->w, p->events);
1692 EV_FREQUENT_CHECK;
1693 }
1694 }
1695 }
1696
1697 #if EV_IDLE_ENABLE
1698 void inline_size
1699 idle_reify (EV_P)
1700 {
1701 if (expect_false (idleall))
1702 {
1703 int pri;
1704
1705 for (pri = NUMPRI; pri--; )
1706 {
1707 if (pendingcnt [pri])
1708 break;
1709
1710 if (idlecnt [pri])
1711 {
1712 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1713 break;
1714 }
1715 }
1716 }
1717 }
1718 #endif
1719
1720 void inline_size
1721 timers_reify (EV_P)
1722 {
1723 EV_FREQUENT_CHECK;
1724
1725 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
1726 {
1727 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
1728
1729 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1730
1731 /* first reschedule or stop timer */
1732 if (w->repeat)
1733 {
1734 ev_at (w) += w->repeat;
1735 if (ev_at (w) < mn_now)
1736 ev_at (w) = mn_now;
1737
1738 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1739
1740 ANHE_at_cache (timers [HEAP0]);
1741 downheap (timers, timercnt, HEAP0);
1742 }
1743 else
1744 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1745
1746 EV_FREQUENT_CHECK;
1747 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1748 }
1749 }
1750
1751 #if EV_PERIODIC_ENABLE
1752 void inline_size
1753 periodics_reify (EV_P)
1754 {
1755 EV_FREQUENT_CHECK;
1756
1757 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
1758 {
1759 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
1760
1761 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1762
1763 /* first reschedule or stop timer */
1764 if (w->reschedule_cb)
1765 {
1766 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1767
1768 assert (("ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
1769
1770 ANHE_at_cache (periodics [HEAP0]);
1771 downheap (periodics, periodiccnt, HEAP0);
1772 }
1773 else if (w->interval)
1774 {
1775 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1776 /* if next trigger time is not sufficiently in the future, put it there */
1777 /* this might happen because of floating point inexactness */
1778 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
1779 {
1780 ev_at (w) += w->interval;
1781
1782 /* if interval is unreasonably low we might still have a time in the past */
1783 /* so correct this. this will make the periodic very inexact, but the user */
1784 /* has effectively asked to get triggered more often than possible */
1785 if (ev_at (w) < ev_rt_now)
1786 ev_at (w) = ev_rt_now;
1787 }
1788
1789 ANHE_at_cache (periodics [HEAP0]);
1790 downheap (periodics, periodiccnt, HEAP0);
1791 }
1792 else
1793 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1794
1795 EV_FREQUENT_CHECK;
1796 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1797 }
1798 }
1799
1800 static void noinline
1801 periodics_reschedule (EV_P)
1802 {
1803 int i;
1804
1805 /* adjust periodics after time jump */
1806 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
1807 {
1808 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
1809
1810 if (w->reschedule_cb)
1811 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1812 else if (w->interval)
1813 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1814
1815 ANHE_at_cache (periodics [i]);
1816 }
1817
1818 reheap (periodics, periodiccnt);
1819 }
1820 #endif
1821
1822 void inline_speed
1823 time_update (EV_P_ ev_tstamp max_block)
1824 {
1825 int i;
1826
1827 #if EV_USE_MONOTONIC
1828 if (expect_true (have_monotonic))
1829 {
1830 ev_tstamp odiff = rtmn_diff;
1831
1832 mn_now = get_clock ();
1833
1834 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1835 /* interpolate in the meantime */
1836 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1837 {
1838 ev_rt_now = rtmn_diff + mn_now;
1839 return;
1840 }
1841
1842 now_floor = mn_now;
1843 ev_rt_now = ev_time ();
1844
1845 /* loop a few times, before making important decisions.
1846 * on the choice of "4": one iteration isn't enough,
1847 * in case we get preempted during the calls to
1848 * ev_time and get_clock. a second call is almost guaranteed
1849 * to succeed in that case, though. and looping a few more times
1850 * doesn't hurt either as we only do this on time-jumps or
1851 * in the unlikely event of having been preempted here.
1852 */
1853 for (i = 4; --i; )
1854 {
1855 rtmn_diff = ev_rt_now - mn_now;
1856
1857 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
1858 return; /* all is well */
1859
1860 ev_rt_now = ev_time ();
1861 mn_now = get_clock ();
1862 now_floor = mn_now;
1863 }
1864
1865 # if EV_PERIODIC_ENABLE
1866 periodics_reschedule (EV_A);
1867 # endif
1868 /* no timer adjustment, as the monotonic clock doesn't jump */
1869 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1870 }
1871 else
1872 #endif
1873 {
1874 ev_rt_now = ev_time ();
1875
1876 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1877 {
1878 #if EV_PERIODIC_ENABLE
1879 periodics_reschedule (EV_A);
1880 #endif
1881 /* adjust timers. this is easy, as the offset is the same for all of them */
1882 for (i = 0; i < timercnt; ++i)
1883 {
1884 ANHE *he = timers + i + HEAP0;
1885 ANHE_w (*he)->at += ev_rt_now - mn_now;
1886 ANHE_at_cache (*he);
1887 }
1888 }
1889
1890 mn_now = ev_rt_now;
1891 }
1892 }
1893
1894 void
1895 ev_ref (EV_P)
1896 {
1897 ++activecnt;
1898 }
1899
1900 void
1901 ev_unref (EV_P)
1902 {
1903 --activecnt;
1904 }
1905
1906 void
1907 ev_now_update (EV_P)
1908 {
1909 time_update (EV_A_ 1e100);
1910 }
1911
1912 static int loop_done;
1913
1914 void
1915 ev_loop (EV_P_ int flags)
1916 {
1917 loop_done = EVUNLOOP_CANCEL;
1918
1919 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1920
1921 do
1922 {
1923 #if EV_VERIFY >= 2
1924 ev_loop_verify (EV_A);
1925 #endif
1926
1927 #ifndef _WIN32
1928 if (expect_false (curpid)) /* penalise the forking check even more */
1929 if (expect_false (getpid () != curpid))
1930 {
1931 curpid = getpid ();
1932 postfork = 1;
1933 }
1934 #endif
1935
1936 #if EV_FORK_ENABLE
1937 /* we might have forked, so queue fork handlers */
1938 if (expect_false (postfork))
1939 if (forkcnt)
1940 {
1941 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1942 call_pending (EV_A);
1943 }
1944 #endif
1945
1946 /* queue prepare watchers (and execute them) */
1947 if (expect_false (preparecnt))
1948 {
1949 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1950 call_pending (EV_A);
1951 }
1952
1953 if (expect_false (!activecnt))
1954 break;
1955
1956 /* we might have forked, so reify kernel state if necessary */
1957 if (expect_false (postfork))
1958 loop_fork (EV_A);
1959
1960 /* update fd-related kernel structures */
1961 fd_reify (EV_A);
1962
1963 /* calculate blocking time */
1964 {
1965 ev_tstamp waittime = 0.;
1966 ev_tstamp sleeptime = 0.;
1967
1968 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1969 {
1970 /* update time to cancel out callback processing overhead */
1971 time_update (EV_A_ 1e100);
1972
1973 waittime = MAX_BLOCKTIME;
1974
1975 if (timercnt)
1976 {
1977 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
1978 if (waittime > to) waittime = to;
1979 }
1980
1981 #if EV_PERIODIC_ENABLE
1982 if (periodiccnt)
1983 {
1984 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
1985 if (waittime > to) waittime = to;
1986 }
1987 #endif
1988
1989 if (expect_false (waittime < timeout_blocktime))
1990 waittime = timeout_blocktime;
1991
1992 sleeptime = waittime - backend_fudge;
1993
1994 if (expect_true (sleeptime > io_blocktime))
1995 sleeptime = io_blocktime;
1996
1997 if (sleeptime)
1998 {
1999 ev_sleep (sleeptime);
2000 waittime -= sleeptime;
2001 }
2002 }
2003
2004 ++loop_count;
2005 backend_poll (EV_A_ waittime);
2006
2007 /* update ev_rt_now, do magic */
2008 time_update (EV_A_ waittime + sleeptime);
2009 }
2010
2011 /* queue pending timers and reschedule them */
2012 timers_reify (EV_A); /* relative timers called last */
2013 #if EV_PERIODIC_ENABLE
2014 periodics_reify (EV_A); /* absolute timers called first */
2015 #endif
2016
2017 #if EV_IDLE_ENABLE
2018 /* queue idle watchers unless other events are pending */
2019 idle_reify (EV_A);
2020 #endif
2021
2022 /* queue check watchers, to be executed first */
2023 if (expect_false (checkcnt))
2024 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2025
2026 call_pending (EV_A);
2027 }
2028 while (expect_true (
2029 activecnt
2030 && !loop_done
2031 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2032 ));
2033
2034 if (loop_done == EVUNLOOP_ONE)
2035 loop_done = EVUNLOOP_CANCEL;
2036 }
2037
2038 void
2039 ev_unloop (EV_P_ int how)
2040 {
2041 loop_done = how;
2042 }
2043
2044 /*****************************************************************************/
2045
2046 void inline_size
2047 wlist_add (WL *head, WL elem)
2048 {
2049 elem->next = *head;
2050 *head = elem;
2051 }
2052
2053 void inline_size
2054 wlist_del (WL *head, WL elem)
2055 {
2056 while (*head)
2057 {
2058 if (*head == elem)
2059 {
2060 *head = elem->next;
2061 return;
2062 }
2063
2064 head = &(*head)->next;
2065 }
2066 }
2067
2068 void inline_speed
2069 clear_pending (EV_P_ W w)
2070 {
2071 if (w->pending)
2072 {
2073 pendings [ABSPRI (w)][w->pending - 1].w = 0;
2074 w->pending = 0;
2075 }
2076 }
2077
2078 int
2079 ev_clear_pending (EV_P_ void *w)
2080 {
2081 W w_ = (W)w;
2082 int pending = w_->pending;
2083
2084 if (expect_true (pending))
2085 {
2086 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2087 w_->pending = 0;
2088 p->w = 0;
2089 return p->events;
2090 }
2091 else
2092 return 0;
2093 }
2094
2095 void inline_size
2096 pri_adjust (EV_P_ W w)
2097 {
2098 int pri = w->priority;
2099 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2100 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2101 w->priority = pri;
2102 }
2103
2104 void inline_speed
2105 ev_start (EV_P_ W w, int active)
2106 {
2107 pri_adjust (EV_A_ w);
2108 w->active = active;
2109 ev_ref (EV_A);
2110 }
2111
2112 void inline_size
2113 ev_stop (EV_P_ W w)
2114 {
2115 ev_unref (EV_A);
2116 w->active = 0;
2117 }
2118
2119 /*****************************************************************************/
2120
2121 void noinline
2122 ev_io_start (EV_P_ ev_io *w)
2123 {
2124 int fd = w->fd;
2125
2126 if (expect_false (ev_is_active (w)))
2127 return;
2128
2129 assert (("ev_io_start called with negative fd", fd >= 0));
2130 assert (("ev_io start called with illegal event mask", !(w->events & ~(EV_IOFDSET | EV_READ | EV_WRITE))));
2131
2132 EV_FREQUENT_CHECK;
2133
2134 ev_start (EV_A_ (W)w, 1);
2135 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2136 wlist_add (&anfds[fd].head, (WL)w);
2137
2138 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
2139 w->events &= ~EV_IOFDSET;
2140
2141 EV_FREQUENT_CHECK;
2142 }
2143
2144 void noinline
2145 ev_io_stop (EV_P_ ev_io *w)
2146 {
2147 clear_pending (EV_A_ (W)w);
2148 if (expect_false (!ev_is_active (w)))
2149 return;
2150
2151 assert (("ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2152
2153 EV_FREQUENT_CHECK;
2154
2155 wlist_del (&anfds[w->fd].head, (WL)w);
2156 ev_stop (EV_A_ (W)w);
2157
2158 fd_change (EV_A_ w->fd, 1);
2159
2160 EV_FREQUENT_CHECK;
2161 }
2162
2163 void noinline
2164 ev_timer_start (EV_P_ ev_timer *w)
2165 {
2166 if (expect_false (ev_is_active (w)))
2167 return;
2168
2169 ev_at (w) += mn_now;
2170
2171 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2172
2173 EV_FREQUENT_CHECK;
2174
2175 ++timercnt;
2176 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2177 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2178 ANHE_w (timers [ev_active (w)]) = (WT)w;
2179 ANHE_at_cache (timers [ev_active (w)]);
2180 upheap (timers, ev_active (w));
2181
2182 EV_FREQUENT_CHECK;
2183
2184 /*assert (("internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2185 }
2186
2187 void noinline
2188 ev_timer_stop (EV_P_ ev_timer *w)
2189 {
2190 clear_pending (EV_A_ (W)w);
2191 if (expect_false (!ev_is_active (w)))
2192 return;
2193
2194 EV_FREQUENT_CHECK;
2195
2196 {
2197 int active = ev_active (w);
2198
2199 assert (("internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2200
2201 --timercnt;
2202
2203 if (expect_true (active < timercnt + HEAP0))
2204 {
2205 timers [active] = timers [timercnt + HEAP0];
2206 adjustheap (timers, timercnt, active);
2207 }
2208 }
2209
2210 EV_FREQUENT_CHECK;
2211
2212 ev_at (w) -= mn_now;
2213
2214 ev_stop (EV_A_ (W)w);
2215 }
2216
2217 void noinline
2218 ev_timer_again (EV_P_ ev_timer *w)
2219 {
2220 EV_FREQUENT_CHECK;
2221
2222 if (ev_is_active (w))
2223 {
2224 if (w->repeat)
2225 {
2226 ev_at (w) = mn_now + w->repeat;
2227 ANHE_at_cache (timers [ev_active (w)]);
2228 adjustheap (timers, timercnt, ev_active (w));
2229 }
2230 else
2231 ev_timer_stop (EV_A_ w);
2232 }
2233 else if (w->repeat)
2234 {
2235 ev_at (w) = w->repeat;
2236 ev_timer_start (EV_A_ w);
2237 }
2238
2239 EV_FREQUENT_CHECK;
2240 }
2241
2242 #if EV_PERIODIC_ENABLE
2243 void noinline
2244 ev_periodic_start (EV_P_ ev_periodic *w)
2245 {
2246 if (expect_false (ev_is_active (w)))
2247 return;
2248
2249 if (w->reschedule_cb)
2250 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2251 else if (w->interval)
2252 {
2253 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
2254 /* this formula differs from the one in periodic_reify because we do not always round up */
2255 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2256 }
2257 else
2258 ev_at (w) = w->offset;
2259
2260 EV_FREQUENT_CHECK;
2261
2262 ++periodiccnt;
2263 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2264 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2265 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2266 ANHE_at_cache (periodics [ev_active (w)]);
2267 upheap (periodics, ev_active (w));
2268
2269 EV_FREQUENT_CHECK;
2270
2271 /*assert (("internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2272 }
2273
2274 void noinline
2275 ev_periodic_stop (EV_P_ ev_periodic *w)
2276 {
2277 clear_pending (EV_A_ (W)w);
2278 if (expect_false (!ev_is_active (w)))
2279 return;
2280
2281 EV_FREQUENT_CHECK;
2282
2283 {
2284 int active = ev_active (w);
2285
2286 assert (("internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2287
2288 --periodiccnt;
2289
2290 if (expect_true (active < periodiccnt + HEAP0))
2291 {
2292 periodics [active] = periodics [periodiccnt + HEAP0];
2293 adjustheap (periodics, periodiccnt, active);
2294 }
2295 }
2296
2297 EV_FREQUENT_CHECK;
2298
2299 ev_stop (EV_A_ (W)w);
2300 }
2301
2302 void noinline
2303 ev_periodic_again (EV_P_ ev_periodic *w)
2304 {
2305 /* TODO: use adjustheap and recalculation */
2306 ev_periodic_stop (EV_A_ w);
2307 ev_periodic_start (EV_A_ w);
2308 }
2309 #endif
2310
2311 #ifndef SA_RESTART
2312 # define SA_RESTART 0
2313 #endif
2314
2315 void noinline
2316 ev_signal_start (EV_P_ ev_signal *w)
2317 {
2318 #if EV_MULTIPLICITY
2319 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2320 #endif
2321 if (expect_false (ev_is_active (w)))
2322 return;
2323
2324 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2325
2326 evpipe_init (EV_A);
2327
2328 EV_FREQUENT_CHECK;
2329
2330 {
2331 #ifndef _WIN32
2332 sigset_t full, prev;
2333 sigfillset (&full);
2334 sigprocmask (SIG_SETMASK, &full, &prev);
2335 #endif
2336
2337 array_needsize (ANSIG, signals, signalmax, w->signum, array_init_zero);
2338
2339 #ifndef _WIN32
2340 sigprocmask (SIG_SETMASK, &prev, 0);
2341 #endif
2342 }
2343
2344 ev_start (EV_A_ (W)w, 1);
2345 wlist_add (&signals [w->signum - 1].head, (WL)w);
2346
2347 if (!((WL)w)->next)
2348 {
2349 #if _WIN32
2350 signal (w->signum, ev_sighandler);
2351 #else
2352 struct sigaction sa;
2353 sa.sa_handler = ev_sighandler;
2354 sigfillset (&sa.sa_mask);
2355 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2356 sigaction (w->signum, &sa, 0);
2357 #endif
2358 }
2359
2360 EV_FREQUENT_CHECK;
2361 }
2362
2363 void noinline
2364 ev_signal_stop (EV_P_ ev_signal *w)
2365 {
2366 clear_pending (EV_A_ (W)w);
2367 if (expect_false (!ev_is_active (w)))
2368 return;
2369
2370 EV_FREQUENT_CHECK;
2371
2372 wlist_del (&signals [w->signum - 1].head, (WL)w);
2373 ev_stop (EV_A_ (W)w);
2374
2375 if (!signals [w->signum - 1].head)
2376 signal (w->signum, SIG_DFL);
2377
2378 EV_FREQUENT_CHECK;
2379 }
2380
2381 void
2382 ev_child_start (EV_P_ ev_child *w)
2383 {
2384 #if EV_MULTIPLICITY
2385 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2386 #endif
2387 if (expect_false (ev_is_active (w)))
2388 return;
2389
2390 EV_FREQUENT_CHECK;
2391
2392 ev_start (EV_A_ (W)w, 1);
2393 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2394
2395 EV_FREQUENT_CHECK;
2396 }
2397
2398 void
2399 ev_child_stop (EV_P_ ev_child *w)
2400 {
2401 clear_pending (EV_A_ (W)w);
2402 if (expect_false (!ev_is_active (w)))
2403 return;
2404
2405 EV_FREQUENT_CHECK;
2406
2407 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2408 ev_stop (EV_A_ (W)w);
2409
2410 EV_FREQUENT_CHECK;
2411 }
2412
2413 #if EV_STAT_ENABLE
2414
2415 # ifdef _WIN32
2416 # undef lstat
2417 # define lstat(a,b) _stati64 (a,b)
2418 # endif
2419
2420 #define DEF_STAT_INTERVAL 5.0074891
2421 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2422 #define MIN_STAT_INTERVAL 0.1074891
2423
2424 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2425
2426 #if EV_USE_INOTIFY
2427 # define EV_INOTIFY_BUFSIZE 8192
2428
2429 static void noinline
2430 infy_add (EV_P_ ev_stat *w)
2431 {
2432 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);
2433
2434 if (w->wd < 0)
2435 {
2436 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2437 ev_timer_again (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2438
2439 /* monitor some parent directory for speedup hints */
2440 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2441 /* but an efficiency issue only */
2442 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2443 {
2444 char path [4096];
2445 strcpy (path, w->path);
2446
2447 do
2448 {
2449 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2450 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2451
2452 char *pend = strrchr (path, '/');
2453
2454 if (!pend)
2455 break; /* whoops, no '/', complain to your admin */
2456
2457 *pend = 0;
2458 w->wd = inotify_add_watch (fs_fd, path, mask);
2459 }
2460 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2461 }
2462 }
2463 else
2464 {
2465 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2466
2467 /* now local changes will be tracked by inotify, but remote changes won't */
2468 /* unless the filesystem it known to be local, we therefore still poll */
2469 /* also do poll on <2.6.25, but with normal frequency */
2470 struct statfs sfs;
2471
2472 if (fs_2625 && !statfs (w->path, &sfs))
2473 if (sfs.f_type == 0x1373 /* devfs */
2474 || sfs.f_type == 0xEF53 /* ext2/3 */
2475 || sfs.f_type == 0x3153464a /* jfs */
2476 || sfs.f_type == 0x52654973 /* reiser3 */
2477 || sfs.f_type == 0x01021994 /* tempfs */
2478 || sfs.f_type == 0x58465342 /* xfs */)
2479 return;
2480
2481 w->timer.repeat = w->interval ? w->interval : fs_2625 ? NFS_STAT_INTERVAL : DEF_STAT_INTERVAL;
2482 ev_timer_again (EV_A_ &w->timer);
2483 }
2484 }
2485
2486 static void noinline
2487 infy_del (EV_P_ ev_stat *w)
2488 {
2489 int slot;
2490 int wd = w->wd;
2491
2492 if (wd < 0)
2493 return;
2494
2495 w->wd = -2;
2496 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2497 wlist_del (&fs_hash [slot].head, (WL)w);
2498
2499 /* remove this watcher, if others are watching it, they will rearm */
2500 inotify_rm_watch (fs_fd, wd);
2501 }
2502
2503 static void noinline
2504 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2505 {
2506 if (slot < 0)
2507 /* overflow, need to check for all hash slots */
2508 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2509 infy_wd (EV_A_ slot, wd, ev);
2510 else
2511 {
2512 WL w_;
2513
2514 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2515 {
2516 ev_stat *w = (ev_stat *)w_;
2517 w_ = w_->next; /* lets us remove this watcher and all before it */
2518
2519 if (w->wd == wd || wd == -1)
2520 {
2521 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2522 {
2523 w->wd = -1;
2524 infy_add (EV_A_ w); /* re-add, no matter what */
2525 }
2526
2527 stat_timer_cb (EV_A_ &w->timer, 0);
2528 }
2529 }
2530 }
2531 }
2532
2533 static void
2534 infy_cb (EV_P_ ev_io *w, int revents)
2535 {
2536 char buf [EV_INOTIFY_BUFSIZE];
2537 struct inotify_event *ev = (struct inotify_event *)buf;
2538 int ofs;
2539 int len = read (fs_fd, buf, sizeof (buf));
2540
2541 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2542 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2543 }
2544
2545 void inline_size
2546 check_2625 (EV_P)
2547 {
2548 /* kernels < 2.6.25 are borked
2549 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
2550 */
2551 struct utsname buf;
2552 int major, minor, micro;
2553
2554 if (uname (&buf))
2555 return;
2556
2557 if (sscanf (buf.release, "%d.%d.%d", &major, &minor, &micro) != 3)
2558 return;
2559
2560 if (major < 2
2561 || (major == 2 && minor < 6)
2562 || (major == 2 && minor == 6 && micro < 25))
2563 return;
2564
2565 fs_2625 = 1;
2566 }
2567
2568 void inline_size
2569 infy_init (EV_P)
2570 {
2571 if (fs_fd != -2)
2572 return;
2573
2574 fs_fd = -1;
2575
2576 check_2625 (EV_A);
2577
2578 fs_fd = inotify_init ();
2579
2580 if (fs_fd >= 0)
2581 {
2582 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2583 ev_set_priority (&fs_w, EV_MAXPRI);
2584 ev_io_start (EV_A_ &fs_w);
2585 }
2586 }
2587
2588 void inline_size
2589 infy_fork (EV_P)
2590 {
2591 int slot;
2592
2593 if (fs_fd < 0)
2594 return;
2595
2596 close (fs_fd);
2597 fs_fd = inotify_init ();
2598
2599 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2600 {
2601 WL w_ = fs_hash [slot].head;
2602 fs_hash [slot].head = 0;
2603
2604 while (w_)
2605 {
2606 ev_stat *w = (ev_stat *)w_;
2607 w_ = w_->next; /* lets us add this watcher */
2608
2609 w->wd = -1;
2610
2611 if (fs_fd >= 0)
2612 infy_add (EV_A_ w); /* re-add, no matter what */
2613 else
2614 ev_timer_again (EV_A_ &w->timer);
2615 }
2616 }
2617 }
2618
2619 #endif
2620
2621 #ifdef _WIN32
2622 # define EV_LSTAT(p,b) _stati64 (p, b)
2623 #else
2624 # define EV_LSTAT(p,b) lstat (p, b)
2625 #endif
2626
2627 void
2628 ev_stat_stat (EV_P_ ev_stat *w)
2629 {
2630 if (lstat (w->path, &w->attr) < 0)
2631 w->attr.st_nlink = 0;
2632 else if (!w->attr.st_nlink)
2633 w->attr.st_nlink = 1;
2634 }
2635
2636 static void noinline
2637 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2638 {
2639 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2640
2641 /* we copy this here each the time so that */
2642 /* prev has the old value when the callback gets invoked */
2643 w->prev = w->attr;
2644 ev_stat_stat (EV_A_ w);
2645
2646 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2647 if (
2648 w->prev.st_dev != w->attr.st_dev
2649 || w->prev.st_ino != w->attr.st_ino
2650 || w->prev.st_mode != w->attr.st_mode
2651 || w->prev.st_nlink != w->attr.st_nlink
2652 || w->prev.st_uid != w->attr.st_uid
2653 || w->prev.st_gid != w->attr.st_gid
2654 || w->prev.st_rdev != w->attr.st_rdev
2655 || w->prev.st_size != w->attr.st_size
2656 || w->prev.st_atime != w->attr.st_atime
2657 || w->prev.st_mtime != w->attr.st_mtime
2658 || w->prev.st_ctime != w->attr.st_ctime
2659 ) {
2660 #if EV_USE_INOTIFY
2661 if (fs_fd >= 0)
2662 {
2663 infy_del (EV_A_ w);
2664 infy_add (EV_A_ w);
2665 ev_stat_stat (EV_A_ w); /* avoid race... */
2666 }
2667 #endif
2668
2669 ev_feed_event (EV_A_ w, EV_STAT);
2670 }
2671 }
2672
2673 void
2674 ev_stat_start (EV_P_ ev_stat *w)
2675 {
2676 if (expect_false (ev_is_active (w)))
2677 return;
2678
2679 ev_stat_stat (EV_A_ w);
2680
2681 if (w->interval < MIN_STAT_INTERVAL && w->interval)
2682 w->interval = MIN_STAT_INTERVAL;
2683
2684 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
2685 ev_set_priority (&w->timer, ev_priority (w));
2686
2687 #if EV_USE_INOTIFY
2688 infy_init (EV_A);
2689
2690 if (fs_fd >= 0)
2691 infy_add (EV_A_ w);
2692 else
2693 #endif
2694 ev_timer_again (EV_A_ &w->timer);
2695
2696 ev_start (EV_A_ (W)w, 1);
2697
2698 EV_FREQUENT_CHECK;
2699 }
2700
2701 void
2702 ev_stat_stop (EV_P_ ev_stat *w)
2703 {
2704 clear_pending (EV_A_ (W)w);
2705 if (expect_false (!ev_is_active (w)))
2706 return;
2707
2708 EV_FREQUENT_CHECK;
2709
2710 #if EV_USE_INOTIFY
2711 infy_del (EV_A_ w);
2712 #endif
2713 ev_timer_stop (EV_A_ &w->timer);
2714
2715 ev_stop (EV_A_ (W)w);
2716
2717 EV_FREQUENT_CHECK;
2718 }
2719 #endif
2720
2721 #if EV_IDLE_ENABLE
2722 void
2723 ev_idle_start (EV_P_ ev_idle *w)
2724 {
2725 if (expect_false (ev_is_active (w)))
2726 return;
2727
2728 pri_adjust (EV_A_ (W)w);
2729
2730 EV_FREQUENT_CHECK;
2731
2732 {
2733 int active = ++idlecnt [ABSPRI (w)];
2734
2735 ++idleall;
2736 ev_start (EV_A_ (W)w, active);
2737
2738 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2739 idles [ABSPRI (w)][active - 1] = w;
2740 }
2741
2742 EV_FREQUENT_CHECK;
2743 }
2744
2745 void
2746 ev_idle_stop (EV_P_ ev_idle *w)
2747 {
2748 clear_pending (EV_A_ (W)w);
2749 if (expect_false (!ev_is_active (w)))
2750 return;
2751
2752 EV_FREQUENT_CHECK;
2753
2754 {
2755 int active = ev_active (w);
2756
2757 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2758 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2759
2760 ev_stop (EV_A_ (W)w);
2761 --idleall;
2762 }
2763
2764 EV_FREQUENT_CHECK;
2765 }
2766 #endif
2767
2768 void
2769 ev_prepare_start (EV_P_ ev_prepare *w)
2770 {
2771 if (expect_false (ev_is_active (w)))
2772 return;
2773
2774 EV_FREQUENT_CHECK;
2775
2776 ev_start (EV_A_ (W)w, ++preparecnt);
2777 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2778 prepares [preparecnt - 1] = w;
2779
2780 EV_FREQUENT_CHECK;
2781 }
2782
2783 void
2784 ev_prepare_stop (EV_P_ ev_prepare *w)
2785 {
2786 clear_pending (EV_A_ (W)w);
2787 if (expect_false (!ev_is_active (w)))
2788 return;
2789
2790 EV_FREQUENT_CHECK;
2791
2792 {
2793 int active = ev_active (w);
2794
2795 prepares [active - 1] = prepares [--preparecnt];
2796 ev_active (prepares [active - 1]) = active;
2797 }
2798
2799 ev_stop (EV_A_ (W)w);
2800
2801 EV_FREQUENT_CHECK;
2802 }
2803
2804 void
2805 ev_check_start (EV_P_ ev_check *w)
2806 {
2807 if (expect_false (ev_is_active (w)))
2808 return;
2809
2810 EV_FREQUENT_CHECK;
2811
2812 ev_start (EV_A_ (W)w, ++checkcnt);
2813 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2814 checks [checkcnt - 1] = w;
2815
2816 EV_FREQUENT_CHECK;
2817 }
2818
2819 void
2820 ev_check_stop (EV_P_ ev_check *w)
2821 {
2822 clear_pending (EV_A_ (W)w);
2823 if (expect_false (!ev_is_active (w)))
2824 return;
2825
2826 EV_FREQUENT_CHECK;
2827
2828 {
2829 int active = ev_active (w);
2830
2831 checks [active - 1] = checks [--checkcnt];
2832 ev_active (checks [active - 1]) = active;
2833 }
2834
2835 ev_stop (EV_A_ (W)w);
2836
2837 EV_FREQUENT_CHECK;
2838 }
2839
2840 #if EV_EMBED_ENABLE
2841 void noinline
2842 ev_embed_sweep (EV_P_ ev_embed *w)
2843 {
2844 ev_loop (w->other, EVLOOP_NONBLOCK);
2845 }
2846
2847 static void
2848 embed_io_cb (EV_P_ ev_io *io, int revents)
2849 {
2850 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2851
2852 if (ev_cb (w))
2853 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2854 else
2855 ev_loop (w->other, EVLOOP_NONBLOCK);
2856 }
2857
2858 static void
2859 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2860 {
2861 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2862
2863 {
2864 struct ev_loop *loop = w->other;
2865
2866 while (fdchangecnt)
2867 {
2868 fd_reify (EV_A);
2869 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2870 }
2871 }
2872 }
2873
2874 static void
2875 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
2876 {
2877 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
2878
2879 {
2880 struct ev_loop *loop = w->other;
2881
2882 ev_loop_fork (EV_A);
2883 }
2884 }
2885
2886 #if 0
2887 static void
2888 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2889 {
2890 ev_idle_stop (EV_A_ idle);
2891 }
2892 #endif
2893
2894 void
2895 ev_embed_start (EV_P_ ev_embed *w)
2896 {
2897 if (expect_false (ev_is_active (w)))
2898 return;
2899
2900 {
2901 struct ev_loop *loop = w->other;
2902 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2903 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2904 }
2905
2906 EV_FREQUENT_CHECK;
2907
2908 ev_set_priority (&w->io, ev_priority (w));
2909 ev_io_start (EV_A_ &w->io);
2910
2911 ev_prepare_init (&w->prepare, embed_prepare_cb);
2912 ev_set_priority (&w->prepare, EV_MINPRI);
2913 ev_prepare_start (EV_A_ &w->prepare);
2914
2915 ev_fork_init (&w->fork, embed_fork_cb);
2916 ev_fork_start (EV_A_ &w->fork);
2917
2918 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2919
2920 ev_start (EV_A_ (W)w, 1);
2921
2922 EV_FREQUENT_CHECK;
2923 }
2924
2925 void
2926 ev_embed_stop (EV_P_ ev_embed *w)
2927 {
2928 clear_pending (EV_A_ (W)w);
2929 if (expect_false (!ev_is_active (w)))
2930 return;
2931
2932 EV_FREQUENT_CHECK;
2933
2934 ev_io_stop (EV_A_ &w->io);
2935 ev_prepare_stop (EV_A_ &w->prepare);
2936 ev_fork_stop (EV_A_ &w->fork);
2937
2938 EV_FREQUENT_CHECK;
2939 }
2940 #endif
2941
2942 #if EV_FORK_ENABLE
2943 void
2944 ev_fork_start (EV_P_ ev_fork *w)
2945 {
2946 if (expect_false (ev_is_active (w)))
2947 return;
2948
2949 EV_FREQUENT_CHECK;
2950
2951 ev_start (EV_A_ (W)w, ++forkcnt);
2952 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2953 forks [forkcnt - 1] = w;
2954
2955 EV_FREQUENT_CHECK;
2956 }
2957
2958 void
2959 ev_fork_stop (EV_P_ ev_fork *w)
2960 {
2961 clear_pending (EV_A_ (W)w);
2962 if (expect_false (!ev_is_active (w)))
2963 return;
2964
2965 EV_FREQUENT_CHECK;
2966
2967 {
2968 int active = ev_active (w);
2969
2970 forks [active - 1] = forks [--forkcnt];
2971 ev_active (forks [active - 1]) = active;
2972 }
2973
2974 ev_stop (EV_A_ (W)w);
2975
2976 EV_FREQUENT_CHECK;
2977 }
2978 #endif
2979
2980 #if EV_ASYNC_ENABLE
2981 void
2982 ev_async_start (EV_P_ ev_async *w)
2983 {
2984 if (expect_false (ev_is_active (w)))
2985 return;
2986
2987 evpipe_init (EV_A);
2988
2989 EV_FREQUENT_CHECK;
2990
2991 ev_start (EV_A_ (W)w, ++asynccnt);
2992 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2993 asyncs [asynccnt - 1] = w;
2994
2995 EV_FREQUENT_CHECK;
2996 }
2997
2998 void
2999 ev_async_stop (EV_P_ ev_async *w)
3000 {
3001 clear_pending (EV_A_ (W)w);
3002 if (expect_false (!ev_is_active (w)))
3003 return;
3004
3005 EV_FREQUENT_CHECK;
3006
3007 {
3008 int active = ev_active (w);
3009
3010 asyncs [active - 1] = asyncs [--asynccnt];
3011 ev_active (asyncs [active - 1]) = active;
3012 }
3013
3014 ev_stop (EV_A_ (W)w);
3015
3016 EV_FREQUENT_CHECK;
3017 }
3018
3019 void
3020 ev_async_send (EV_P_ ev_async *w)
3021 {
3022 w->sent = 1;
3023 evpipe_write (EV_A_ &gotasync);
3024 }
3025 #endif
3026
3027 /*****************************************************************************/
3028
3029 struct ev_once
3030 {
3031 ev_io io;
3032 ev_timer to;
3033 void (*cb)(int revents, void *arg);
3034 void *arg;
3035 };
3036
3037 static void
3038 once_cb (EV_P_ struct ev_once *once, int revents)
3039 {
3040 void (*cb)(int revents, void *arg) = once->cb;
3041 void *arg = once->arg;
3042
3043 ev_io_stop (EV_A_ &once->io);
3044 ev_timer_stop (EV_A_ &once->to);
3045 ev_free (once);
3046
3047 cb (revents, arg);
3048 }
3049
3050 static void
3051 once_cb_io (EV_P_ ev_io *w, int revents)
3052 {
3053 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3054
3055 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3056 }
3057
3058 static void
3059 once_cb_to (EV_P_ ev_timer *w, int revents)
3060 {
3061 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3062
3063 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3064 }
3065
3066 void
3067 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3068 {
3069 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3070
3071 if (expect_false (!once))
3072 {
3073 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3074 return;
3075 }
3076
3077 once->cb = cb;
3078 once->arg = arg;
3079
3080 ev_init (&once->io, once_cb_io);
3081 if (fd >= 0)
3082 {
3083 ev_io_set (&once->io, fd, events);
3084 ev_io_start (EV_A_ &once->io);
3085 }
3086
3087 ev_init (&once->to, once_cb_to);
3088 if (timeout >= 0.)
3089 {
3090 ev_timer_set (&once->to, timeout, 0.);
3091 ev_timer_start (EV_A_ &once->to);
3092 }
3093 }
3094
3095 #if EV_MULTIPLICITY
3096 #include "ev_wrap.h"
3097 #endif
3098
3099 #ifdef __cplusplus
3100 }
3101 #endif
3102