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Revision: 1.236
Committed: Wed May 7 14:46:22 2008 UTC (16 years, 2 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.235: +2 -1 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 /* this big block deduces configuration from config.h */
45 #ifndef EV_STANDALONE
46 # ifdef EV_CONFIG_H
47 # include EV_CONFIG_H
48 # else
49 # include "config.h"
50 # endif
51
52 # if HAVE_CLOCK_GETTIME
53 # ifndef EV_USE_MONOTONIC
54 # define EV_USE_MONOTONIC 1
55 # endif
56 # ifndef EV_USE_REALTIME
57 # define EV_USE_REALTIME 1
58 # endif
59 # else
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 0
62 # endif
63 # ifndef EV_USE_REALTIME
64 # define EV_USE_REALTIME 0
65 # endif
66 # endif
67
68 # ifndef EV_USE_NANOSLEEP
69 # if HAVE_NANOSLEEP
70 # define EV_USE_NANOSLEEP 1
71 # else
72 # define EV_USE_NANOSLEEP 0
73 # endif
74 # endif
75
76 # ifndef EV_USE_SELECT
77 # if HAVE_SELECT && HAVE_SYS_SELECT_H
78 # define EV_USE_SELECT 1
79 # else
80 # define EV_USE_SELECT 0
81 # endif
82 # endif
83
84 # ifndef EV_USE_POLL
85 # if HAVE_POLL && HAVE_POLL_H
86 # define EV_USE_POLL 1
87 # else
88 # define EV_USE_POLL 0
89 # endif
90 # endif
91
92 # ifndef EV_USE_EPOLL
93 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
94 # define EV_USE_EPOLL 1
95 # else
96 # define EV_USE_EPOLL 0
97 # endif
98 # endif
99
100 # ifndef EV_USE_KQUEUE
101 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
102 # define EV_USE_KQUEUE 1
103 # else
104 # define EV_USE_KQUEUE 0
105 # endif
106 # endif
107
108 # ifndef EV_USE_PORT
109 # if HAVE_PORT_H && HAVE_PORT_CREATE
110 # define EV_USE_PORT 1
111 # else
112 # define EV_USE_PORT 0
113 # endif
114 # endif
115
116 # ifndef EV_USE_INOTIFY
117 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
118 # define EV_USE_INOTIFY 1
119 # else
120 # define EV_USE_INOTIFY 0
121 # endif
122 # endif
123
124 # ifndef EV_USE_EVENTFD
125 # if HAVE_EVENTFD
126 # define EV_USE_EVENTFD 1
127 # else
128 # define EV_USE_EVENTFD 0
129 # endif
130 # endif
131
132 #endif
133
134 #include <math.h>
135 #include <stdlib.h>
136 #include <fcntl.h>
137 #include <stddef.h>
138
139 #include <stdio.h>
140
141 #include <assert.h>
142 #include <errno.h>
143 #include <sys/types.h>
144 #include <time.h>
145
146 #include <signal.h>
147
148 #ifdef EV_H
149 # include EV_H
150 #else
151 # include "ev.h"
152 #endif
153
154 #ifndef _WIN32
155 # include <sys/time.h>
156 # include <sys/wait.h>
157 # include <unistd.h>
158 #else
159 # define WIN32_LEAN_AND_MEAN
160 # include <windows.h>
161 # ifndef EV_SELECT_IS_WINSOCKET
162 # define EV_SELECT_IS_WINSOCKET 1
163 # endif
164 #endif
165
166 /* this block tries to deduce configuration from header-defined symbols and defaults */
167
168 #ifndef EV_USE_MONOTONIC
169 # define EV_USE_MONOTONIC 0
170 #endif
171
172 #ifndef EV_USE_REALTIME
173 # define EV_USE_REALTIME 0
174 #endif
175
176 #ifndef EV_USE_NANOSLEEP
177 # define EV_USE_NANOSLEEP 0
178 #endif
179
180 #ifndef EV_USE_SELECT
181 # define EV_USE_SELECT 1
182 #endif
183
184 #ifndef EV_USE_POLL
185 # ifdef _WIN32
186 # define EV_USE_POLL 0
187 # else
188 # define EV_USE_POLL 1
189 # endif
190 #endif
191
192 #ifndef EV_USE_EPOLL
193 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
194 # define EV_USE_EPOLL 1
195 # else
196 # define EV_USE_EPOLL 0
197 # endif
198 #endif
199
200 #ifndef EV_USE_KQUEUE
201 # define EV_USE_KQUEUE 0
202 #endif
203
204 #ifndef EV_USE_PORT
205 # define EV_USE_PORT 0
206 #endif
207
208 #ifndef EV_USE_INOTIFY
209 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
210 # define EV_USE_INOTIFY 1
211 # else
212 # define EV_USE_INOTIFY 0
213 # endif
214 #endif
215
216 #ifndef EV_PID_HASHSIZE
217 # if EV_MINIMAL
218 # define EV_PID_HASHSIZE 1
219 # else
220 # define EV_PID_HASHSIZE 16
221 # endif
222 #endif
223
224 #ifndef EV_INOTIFY_HASHSIZE
225 # if EV_MINIMAL
226 # define EV_INOTIFY_HASHSIZE 1
227 # else
228 # define EV_INOTIFY_HASHSIZE 16
229 # endif
230 #endif
231
232 #ifndef EV_USE_EVENTFD
233 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
234 # define EV_USE_EVENTFD 1
235 # else
236 # define EV_USE_EVENTFD 0
237 # endif
238 #endif
239
240 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
241
242 #ifndef CLOCK_MONOTONIC
243 # undef EV_USE_MONOTONIC
244 # define EV_USE_MONOTONIC 0
245 #endif
246
247 #ifndef CLOCK_REALTIME
248 # undef EV_USE_REALTIME
249 # define EV_USE_REALTIME 0
250 #endif
251
252 #if !EV_STAT_ENABLE
253 # undef EV_USE_INOTIFY
254 # define EV_USE_INOTIFY 0
255 #endif
256
257 #if !EV_USE_NANOSLEEP
258 # ifndef _WIN32
259 # include <sys/select.h>
260 # endif
261 #endif
262
263 #if EV_USE_INOTIFY
264 # include <sys/inotify.h>
265 #endif
266
267 #if EV_SELECT_IS_WINSOCKET
268 # include <winsock.h>
269 #endif
270
271 #if EV_USE_EVENTFD
272 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
273 # include <stdint.h>
274 # ifdef __cplusplus
275 extern "C" {
276 # endif
277 int eventfd (unsigned int initval, int flags);
278 # ifdef __cplusplus
279 }
280 # endif
281 #endif
282
283 /**/
284
285 /*
286 * This is used to avoid floating point rounding problems.
287 * It is added to ev_rt_now when scheduling periodics
288 * to ensure progress, time-wise, even when rounding
289 * errors are against us.
290 * This value is good at least till the year 4000.
291 * Better solutions welcome.
292 */
293 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
294
295 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
296 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
297 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
298
299 #if __GNUC__ >= 4
300 # define expect(expr,value) __builtin_expect ((expr),(value))
301 # define noinline __attribute__ ((noinline))
302 #else
303 # define expect(expr,value) (expr)
304 # define noinline
305 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
306 # define inline
307 # endif
308 #endif
309
310 #define expect_false(expr) expect ((expr) != 0, 0)
311 #define expect_true(expr) expect ((expr) != 0, 1)
312 #define inline_size static inline
313
314 #if EV_MINIMAL
315 # define inline_speed static noinline
316 #else
317 # define inline_speed static inline
318 #endif
319
320 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
321 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
322
323 #define EMPTY /* required for microsofts broken pseudo-c compiler */
324 #define EMPTY2(a,b) /* used to suppress some warnings */
325
326 typedef ev_watcher *W;
327 typedef ev_watcher_list *WL;
328 typedef ev_watcher_time *WT;
329
330 #define ev_active(w) ((W)(w))->active
331 #define ev_at(w) ((WT)(w))->at
332
333 #if EV_USE_MONOTONIC
334 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
335 /* giving it a reasonably high chance of working on typical architetcures */
336 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
337 #endif
338
339 #ifdef _WIN32
340 # include "ev_win32.c"
341 #endif
342
343 /*****************************************************************************/
344
345 static void (*syserr_cb)(const char *msg);
346
347 void
348 ev_set_syserr_cb (void (*cb)(const char *msg))
349 {
350 syserr_cb = cb;
351 }
352
353 static void noinline
354 syserr (const char *msg)
355 {
356 if (!msg)
357 msg = "(libev) system error";
358
359 if (syserr_cb)
360 syserr_cb (msg);
361 else
362 {
363 perror (msg);
364 abort ();
365 }
366 }
367
368 static void *
369 ev_realloc_emul (void *ptr, long size)
370 {
371 /* some systems, notably openbsd and darwin, fail to properly
372 * implement realloc (x, 0) (as required by both ansi c-98 and
373 * the single unix specification, so work around them here.
374 */
375
376 if (size)
377 return realloc (ptr, size);
378
379 free (ptr);
380 return 0;
381 }
382
383 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
384
385 void
386 ev_set_allocator (void *(*cb)(void *ptr, long size))
387 {
388 alloc = cb;
389 }
390
391 inline_speed void *
392 ev_realloc (void *ptr, long size)
393 {
394 ptr = alloc (ptr, size);
395
396 if (!ptr && size)
397 {
398 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
399 abort ();
400 }
401
402 return ptr;
403 }
404
405 #define ev_malloc(size) ev_realloc (0, (size))
406 #define ev_free(ptr) ev_realloc ((ptr), 0)
407
408 /*****************************************************************************/
409
410 typedef struct
411 {
412 WL head;
413 unsigned char events;
414 unsigned char reify;
415 #if EV_SELECT_IS_WINSOCKET
416 SOCKET handle;
417 #endif
418 } ANFD;
419
420 typedef struct
421 {
422 W w;
423 int events;
424 } ANPENDING;
425
426 #if EV_USE_INOTIFY
427 typedef struct
428 {
429 WL head;
430 } ANFS;
431 #endif
432
433 #if EV_MULTIPLICITY
434
435 struct ev_loop
436 {
437 ev_tstamp ev_rt_now;
438 #define ev_rt_now ((loop)->ev_rt_now)
439 #define VAR(name,decl) decl;
440 #include "ev_vars.h"
441 #undef VAR
442 };
443 #include "ev_wrap.h"
444
445 static struct ev_loop default_loop_struct;
446 struct ev_loop *ev_default_loop_ptr;
447
448 #else
449
450 ev_tstamp ev_rt_now;
451 #define VAR(name,decl) static decl;
452 #include "ev_vars.h"
453 #undef VAR
454
455 static int ev_default_loop_ptr;
456
457 #endif
458
459 /*****************************************************************************/
460
461 ev_tstamp
462 ev_time (void)
463 {
464 #if EV_USE_REALTIME
465 struct timespec ts;
466 clock_gettime (CLOCK_REALTIME, &ts);
467 return ts.tv_sec + ts.tv_nsec * 1e-9;
468 #else
469 struct timeval tv;
470 gettimeofday (&tv, 0);
471 return tv.tv_sec + tv.tv_usec * 1e-6;
472 #endif
473 }
474
475 ev_tstamp inline_size
476 get_clock (void)
477 {
478 #if EV_USE_MONOTONIC
479 if (expect_true (have_monotonic))
480 {
481 struct timespec ts;
482 clock_gettime (CLOCK_MONOTONIC, &ts);
483 return ts.tv_sec + ts.tv_nsec * 1e-9;
484 }
485 #endif
486
487 return ev_time ();
488 }
489
490 #if EV_MULTIPLICITY
491 ev_tstamp
492 ev_now (EV_P)
493 {
494 return ev_rt_now;
495 }
496 #endif
497
498 void
499 ev_sleep (ev_tstamp delay)
500 {
501 if (delay > 0.)
502 {
503 #if EV_USE_NANOSLEEP
504 struct timespec ts;
505
506 ts.tv_sec = (time_t)delay;
507 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
508
509 nanosleep (&ts, 0);
510 #elif defined(_WIN32)
511 Sleep ((unsigned long)(delay * 1e3));
512 #else
513 struct timeval tv;
514
515 tv.tv_sec = (time_t)delay;
516 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
517
518 select (0, 0, 0, 0, &tv);
519 #endif
520 }
521 }
522
523 /*****************************************************************************/
524
525 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
526
527 int inline_size
528 array_nextsize (int elem, int cur, int cnt)
529 {
530 int ncur = cur + 1;
531
532 do
533 ncur <<= 1;
534 while (cnt > ncur);
535
536 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
537 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
538 {
539 ncur *= elem;
540 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
541 ncur = ncur - sizeof (void *) * 4;
542 ncur /= elem;
543 }
544
545 return ncur;
546 }
547
548 static noinline void *
549 array_realloc (int elem, void *base, int *cur, int cnt)
550 {
551 *cur = array_nextsize (elem, *cur, cnt);
552 return ev_realloc (base, elem * *cur);
553 }
554
555 #define array_needsize(type,base,cur,cnt,init) \
556 if (expect_false ((cnt) > (cur))) \
557 { \
558 int ocur_ = (cur); \
559 (base) = (type *)array_realloc \
560 (sizeof (type), (base), &(cur), (cnt)); \
561 init ((base) + (ocur_), (cur) - ocur_); \
562 }
563
564 #if 0
565 #define array_slim(type,stem) \
566 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
567 { \
568 stem ## max = array_roundsize (stem ## cnt >> 1); \
569 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
570 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
571 }
572 #endif
573
574 #define array_free(stem, idx) \
575 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
576
577 /*****************************************************************************/
578
579 void noinline
580 ev_feed_event (EV_P_ void *w, int revents)
581 {
582 W w_ = (W)w;
583 int pri = ABSPRI (w_);
584
585 if (expect_false (w_->pending))
586 pendings [pri][w_->pending - 1].events |= revents;
587 else
588 {
589 w_->pending = ++pendingcnt [pri];
590 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
591 pendings [pri][w_->pending - 1].w = w_;
592 pendings [pri][w_->pending - 1].events = revents;
593 }
594 }
595
596 void inline_speed
597 queue_events (EV_P_ W *events, int eventcnt, int type)
598 {
599 int i;
600
601 for (i = 0; i < eventcnt; ++i)
602 ev_feed_event (EV_A_ events [i], type);
603 }
604
605 /*****************************************************************************/
606
607 void inline_size
608 anfds_init (ANFD *base, int count)
609 {
610 while (count--)
611 {
612 base->head = 0;
613 base->events = EV_NONE;
614 base->reify = 0;
615
616 ++base;
617 }
618 }
619
620 void inline_speed
621 fd_event (EV_P_ int fd, int revents)
622 {
623 ANFD *anfd = anfds + fd;
624 ev_io *w;
625
626 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
627 {
628 int ev = w->events & revents;
629
630 if (ev)
631 ev_feed_event (EV_A_ (W)w, ev);
632 }
633 }
634
635 void
636 ev_feed_fd_event (EV_P_ int fd, int revents)
637 {
638 if (fd >= 0 && fd < anfdmax)
639 fd_event (EV_A_ fd, revents);
640 }
641
642 void inline_size
643 fd_reify (EV_P)
644 {
645 int i;
646
647 for (i = 0; i < fdchangecnt; ++i)
648 {
649 int fd = fdchanges [i];
650 ANFD *anfd = anfds + fd;
651 ev_io *w;
652
653 unsigned char events = 0;
654
655 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
656 events |= (unsigned char)w->events;
657
658 #if EV_SELECT_IS_WINSOCKET
659 if (events)
660 {
661 unsigned long argp;
662 #ifdef EV_FD_TO_WIN32_HANDLE
663 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
664 #else
665 anfd->handle = _get_osfhandle (fd);
666 #endif
667 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
668 }
669 #endif
670
671 {
672 unsigned char o_events = anfd->events;
673 unsigned char o_reify = anfd->reify;
674
675 anfd->reify = 0;
676 anfd->events = events;
677
678 if (o_events != events || o_reify & EV_IOFDSET)
679 backend_modify (EV_A_ fd, o_events, events);
680 }
681 }
682
683 fdchangecnt = 0;
684 }
685
686 void inline_size
687 fd_change (EV_P_ int fd, int flags)
688 {
689 unsigned char reify = anfds [fd].reify;
690 anfds [fd].reify |= flags;
691
692 if (expect_true (!reify))
693 {
694 ++fdchangecnt;
695 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
696 fdchanges [fdchangecnt - 1] = fd;
697 }
698 }
699
700 void inline_speed
701 fd_kill (EV_P_ int fd)
702 {
703 ev_io *w;
704
705 while ((w = (ev_io *)anfds [fd].head))
706 {
707 ev_io_stop (EV_A_ w);
708 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
709 }
710 }
711
712 int inline_size
713 fd_valid (int fd)
714 {
715 #ifdef _WIN32
716 return _get_osfhandle (fd) != -1;
717 #else
718 return fcntl (fd, F_GETFD) != -1;
719 #endif
720 }
721
722 /* called on EBADF to verify fds */
723 static void noinline
724 fd_ebadf (EV_P)
725 {
726 int fd;
727
728 for (fd = 0; fd < anfdmax; ++fd)
729 if (anfds [fd].events)
730 if (!fd_valid (fd) == -1 && errno == EBADF)
731 fd_kill (EV_A_ fd);
732 }
733
734 /* called on ENOMEM in select/poll to kill some fds and retry */
735 static void noinline
736 fd_enomem (EV_P)
737 {
738 int fd;
739
740 for (fd = anfdmax; fd--; )
741 if (anfds [fd].events)
742 {
743 fd_kill (EV_A_ fd);
744 return;
745 }
746 }
747
748 /* usually called after fork if backend needs to re-arm all fds from scratch */
749 static void noinline
750 fd_rearm_all (EV_P)
751 {
752 int fd;
753
754 for (fd = 0; fd < anfdmax; ++fd)
755 if (anfds [fd].events)
756 {
757 anfds [fd].events = 0;
758 fd_change (EV_A_ fd, EV_IOFDSET | 1);
759 }
760 }
761
762 /*****************************************************************************/
763
764 /*
765 * at the moment we allow libev the luxury of two heaps,
766 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
767 * which is more cache-efficient.
768 * the difference is about 5% with 50000+ watchers.
769 */
770 #define USE_4HEAP !EV_MINIMAL
771 #if USE_4HEAP
772
773 #define HEAP0 3 /* index of first element in heap */
774
775 /* towards the root */
776 void inline_speed
777 upheap (WT *heap, int k)
778 {
779 WT w = heap [k];
780
781 for (;;)
782 {
783 int p = ((k - HEAP0 - 1) / 4) + HEAP0;
784
785 if (p >= HEAP0 || heap [p]->at <= w->at)
786 break;
787
788 heap [k] = heap [p];
789 ev_active (heap [k]) = k;
790 k = p;
791 }
792
793 heap [k] = w;
794 ev_active (heap [k]) = k;
795 }
796
797 /* away from the root */
798 void inline_speed
799 downheap (WT *heap, int N, int k)
800 {
801 WT w = heap [k];
802 WT *E = heap + N + HEAP0;
803
804 for (;;)
805 {
806 ev_tstamp minat;
807 WT *minpos;
808 WT *pos = heap + 4 * (k - HEAP0) + HEAP0;
809
810 // find minimum child
811 if (expect_true (pos +3 < E))
812 {
813 /* fast path */
814 (minpos = pos + 0), (minat = (*minpos)->at);
815 if (pos [1]->at < minat) (minpos = pos + 1), (minat = (*minpos)->at);
816 if (pos [2]->at < minat) (minpos = pos + 2), (minat = (*minpos)->at);
817 if (pos [3]->at < minat) (minpos = pos + 3), (minat = (*minpos)->at);
818 }
819 else
820 {
821 /* slow path */
822 if (pos >= E)
823 break;
824 (minpos = pos + 0), (minat = (*minpos)->at);
825 if (pos + 1 < E && pos [1]->at < minat) (minpos = pos + 1), (minat = (*minpos)->at);
826 if (pos + 2 < E && pos [2]->at < minat) (minpos = pos + 2), (minat = (*minpos)->at);
827 if (pos + 3 < E && pos [3]->at < minat) (minpos = pos + 3), (minat = (*minpos)->at);
828 }
829
830 if (w->at <= minat)
831 break;
832
833 ev_active (*minpos) = k;
834 heap [k] = *minpos;
835
836 k = minpos - heap;
837 }
838
839 heap [k] = w;
840 ev_active (heap [k]) = k;
841 }
842
843 #else // 4HEAP
844
845 #define HEAP0 1
846
847 /* towards the root */
848 void inline_speed
849 upheap (WT *heap, int k)
850 {
851 WT w = heap [k];
852
853 for (;;)
854 {
855 int p = k >> 1;
856
857 /* maybe we could use a dummy element at heap [0]? */
858 if (!p || heap [p]->at <= w->at)
859 break;
860
861 heap [k] = heap [p];
862 ev_active (heap [k]) = k;
863 k = p;
864 }
865
866 heap [k] = w;
867 ev_active (heap [k]) = k;
868 }
869
870 /* away from the root */
871 void inline_speed
872 downheap (WT *heap, int N, int k)
873 {
874 WT w = heap [k];
875
876 for (;;)
877 {
878 int c = k << 1;
879
880 if (c > N)
881 break;
882
883 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
884 ? 1 : 0;
885
886 if (w->at <= heap [c]->at)
887 break;
888
889 heap [k] = heap [c];
890 ((W)heap [k])->active = k;
891
892 k = c;
893 }
894
895 heap [k] = w;
896 ev_active (heap [k]) = k;
897 }
898 #endif
899
900 void inline_size
901 adjustheap (WT *heap, int N, int k)
902 {
903 upheap (heap, k);
904 downheap (heap, N, k);
905 }
906
907 /*****************************************************************************/
908
909 typedef struct
910 {
911 WL head;
912 EV_ATOMIC_T gotsig;
913 } ANSIG;
914
915 static ANSIG *signals;
916 static int signalmax;
917
918 static EV_ATOMIC_T gotsig;
919
920 void inline_size
921 signals_init (ANSIG *base, int count)
922 {
923 while (count--)
924 {
925 base->head = 0;
926 base->gotsig = 0;
927
928 ++base;
929 }
930 }
931
932 /*****************************************************************************/
933
934 void inline_speed
935 fd_intern (int fd)
936 {
937 #ifdef _WIN32
938 int arg = 1;
939 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
940 #else
941 fcntl (fd, F_SETFD, FD_CLOEXEC);
942 fcntl (fd, F_SETFL, O_NONBLOCK);
943 #endif
944 }
945
946 static void noinline
947 evpipe_init (EV_P)
948 {
949 if (!ev_is_active (&pipeev))
950 {
951 #if EV_USE_EVENTFD
952 if ((evfd = eventfd (0, 0)) >= 0)
953 {
954 evpipe [0] = -1;
955 fd_intern (evfd);
956 ev_io_set (&pipeev, evfd, EV_READ);
957 }
958 else
959 #endif
960 {
961 while (pipe (evpipe))
962 syserr ("(libev) error creating signal/async pipe");
963
964 fd_intern (evpipe [0]);
965 fd_intern (evpipe [1]);
966 ev_io_set (&pipeev, evpipe [0], EV_READ);
967 }
968
969 ev_io_start (EV_A_ &pipeev);
970 ev_unref (EV_A); /* watcher should not keep loop alive */
971 }
972 }
973
974 void inline_size
975 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
976 {
977 if (!*flag)
978 {
979 int old_errno = errno; /* save errno because write might clobber it */
980
981 *flag = 1;
982
983 #if EV_USE_EVENTFD
984 if (evfd >= 0)
985 {
986 uint64_t counter = 1;
987 write (evfd, &counter, sizeof (uint64_t));
988 }
989 else
990 #endif
991 write (evpipe [1], &old_errno, 1);
992
993 errno = old_errno;
994 }
995 }
996
997 static void
998 pipecb (EV_P_ ev_io *iow, int revents)
999 {
1000 #if EV_USE_EVENTFD
1001 if (evfd >= 0)
1002 {
1003 uint64_t counter;
1004 read (evfd, &counter, sizeof (uint64_t));
1005 }
1006 else
1007 #endif
1008 {
1009 char dummy;
1010 read (evpipe [0], &dummy, 1);
1011 }
1012
1013 if (gotsig && ev_is_default_loop (EV_A))
1014 {
1015 int signum;
1016 gotsig = 0;
1017
1018 for (signum = signalmax; signum--; )
1019 if (signals [signum].gotsig)
1020 ev_feed_signal_event (EV_A_ signum + 1);
1021 }
1022
1023 #if EV_ASYNC_ENABLE
1024 if (gotasync)
1025 {
1026 int i;
1027 gotasync = 0;
1028
1029 for (i = asynccnt; i--; )
1030 if (asyncs [i]->sent)
1031 {
1032 asyncs [i]->sent = 0;
1033 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1034 }
1035 }
1036 #endif
1037 }
1038
1039 /*****************************************************************************/
1040
1041 static void
1042 ev_sighandler (int signum)
1043 {
1044 #if EV_MULTIPLICITY
1045 struct ev_loop *loop = &default_loop_struct;
1046 #endif
1047
1048 #if _WIN32
1049 signal (signum, ev_sighandler);
1050 #endif
1051
1052 signals [signum - 1].gotsig = 1;
1053 evpipe_write (EV_A_ &gotsig);
1054 }
1055
1056 void noinline
1057 ev_feed_signal_event (EV_P_ int signum)
1058 {
1059 WL w;
1060
1061 #if EV_MULTIPLICITY
1062 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1063 #endif
1064
1065 --signum;
1066
1067 if (signum < 0 || signum >= signalmax)
1068 return;
1069
1070 signals [signum].gotsig = 0;
1071
1072 for (w = signals [signum].head; w; w = w->next)
1073 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1074 }
1075
1076 /*****************************************************************************/
1077
1078 static WL childs [EV_PID_HASHSIZE];
1079
1080 #ifndef _WIN32
1081
1082 static ev_signal childev;
1083
1084 #ifndef WIFCONTINUED
1085 # define WIFCONTINUED(status) 0
1086 #endif
1087
1088 void inline_speed
1089 child_reap (EV_P_ int chain, int pid, int status)
1090 {
1091 ev_child *w;
1092 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1093
1094 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1095 {
1096 if ((w->pid == pid || !w->pid)
1097 && (!traced || (w->flags & 1)))
1098 {
1099 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1100 w->rpid = pid;
1101 w->rstatus = status;
1102 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1103 }
1104 }
1105 }
1106
1107 #ifndef WCONTINUED
1108 # define WCONTINUED 0
1109 #endif
1110
1111 static void
1112 childcb (EV_P_ ev_signal *sw, int revents)
1113 {
1114 int pid, status;
1115
1116 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1117 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1118 if (!WCONTINUED
1119 || errno != EINVAL
1120 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1121 return;
1122
1123 /* make sure we are called again until all children have been reaped */
1124 /* we need to do it this way so that the callback gets called before we continue */
1125 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1126
1127 child_reap (EV_A_ pid, pid, status);
1128 if (EV_PID_HASHSIZE > 1)
1129 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1130 }
1131
1132 #endif
1133
1134 /*****************************************************************************/
1135
1136 #if EV_USE_PORT
1137 # include "ev_port.c"
1138 #endif
1139 #if EV_USE_KQUEUE
1140 # include "ev_kqueue.c"
1141 #endif
1142 #if EV_USE_EPOLL
1143 # include "ev_epoll.c"
1144 #endif
1145 #if EV_USE_POLL
1146 # include "ev_poll.c"
1147 #endif
1148 #if EV_USE_SELECT
1149 # include "ev_select.c"
1150 #endif
1151
1152 int
1153 ev_version_major (void)
1154 {
1155 return EV_VERSION_MAJOR;
1156 }
1157
1158 int
1159 ev_version_minor (void)
1160 {
1161 return EV_VERSION_MINOR;
1162 }
1163
1164 /* return true if we are running with elevated privileges and should ignore env variables */
1165 int inline_size
1166 enable_secure (void)
1167 {
1168 #ifdef _WIN32
1169 return 0;
1170 #else
1171 return getuid () != geteuid ()
1172 || getgid () != getegid ();
1173 #endif
1174 }
1175
1176 unsigned int
1177 ev_supported_backends (void)
1178 {
1179 unsigned int flags = 0;
1180
1181 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1182 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1183 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1184 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1185 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1186
1187 return flags;
1188 }
1189
1190 unsigned int
1191 ev_recommended_backends (void)
1192 {
1193 unsigned int flags = ev_supported_backends ();
1194
1195 #ifndef __NetBSD__
1196 /* kqueue is borked on everything but netbsd apparently */
1197 /* it usually doesn't work correctly on anything but sockets and pipes */
1198 flags &= ~EVBACKEND_KQUEUE;
1199 #endif
1200 #ifdef __APPLE__
1201 // flags &= ~EVBACKEND_KQUEUE; for documentation
1202 flags &= ~EVBACKEND_POLL;
1203 #endif
1204
1205 return flags;
1206 }
1207
1208 unsigned int
1209 ev_embeddable_backends (void)
1210 {
1211 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1212
1213 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1214 /* please fix it and tell me how to detect the fix */
1215 flags &= ~EVBACKEND_EPOLL;
1216
1217 return flags;
1218 }
1219
1220 unsigned int
1221 ev_backend (EV_P)
1222 {
1223 return backend;
1224 }
1225
1226 unsigned int
1227 ev_loop_count (EV_P)
1228 {
1229 return loop_count;
1230 }
1231
1232 void
1233 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1234 {
1235 io_blocktime = interval;
1236 }
1237
1238 void
1239 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1240 {
1241 timeout_blocktime = interval;
1242 }
1243
1244 static void noinline
1245 loop_init (EV_P_ unsigned int flags)
1246 {
1247 if (!backend)
1248 {
1249 #if EV_USE_MONOTONIC
1250 {
1251 struct timespec ts;
1252 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1253 have_monotonic = 1;
1254 }
1255 #endif
1256
1257 ev_rt_now = ev_time ();
1258 mn_now = get_clock ();
1259 now_floor = mn_now;
1260 rtmn_diff = ev_rt_now - mn_now;
1261
1262 io_blocktime = 0.;
1263 timeout_blocktime = 0.;
1264 backend = 0;
1265 backend_fd = -1;
1266 gotasync = 0;
1267 #if EV_USE_INOTIFY
1268 fs_fd = -2;
1269 #endif
1270
1271 /* pid check not overridable via env */
1272 #ifndef _WIN32
1273 if (flags & EVFLAG_FORKCHECK)
1274 curpid = getpid ();
1275 #endif
1276
1277 if (!(flags & EVFLAG_NOENV)
1278 && !enable_secure ()
1279 && getenv ("LIBEV_FLAGS"))
1280 flags = atoi (getenv ("LIBEV_FLAGS"));
1281
1282 if (!(flags & 0x0000ffffU))
1283 flags |= ev_recommended_backends ();
1284
1285 #if EV_USE_PORT
1286 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1287 #endif
1288 #if EV_USE_KQUEUE
1289 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1290 #endif
1291 #if EV_USE_EPOLL
1292 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1293 #endif
1294 #if EV_USE_POLL
1295 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1296 #endif
1297 #if EV_USE_SELECT
1298 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1299 #endif
1300
1301 ev_init (&pipeev, pipecb);
1302 ev_set_priority (&pipeev, EV_MAXPRI);
1303 }
1304 }
1305
1306 static void noinline
1307 loop_destroy (EV_P)
1308 {
1309 int i;
1310
1311 if (ev_is_active (&pipeev))
1312 {
1313 ev_ref (EV_A); /* signal watcher */
1314 ev_io_stop (EV_A_ &pipeev);
1315
1316 #if EV_USE_EVENTFD
1317 if (evfd >= 0)
1318 close (evfd);
1319 #endif
1320
1321 if (evpipe [0] >= 0)
1322 {
1323 close (evpipe [0]);
1324 close (evpipe [1]);
1325 }
1326 }
1327
1328 #if EV_USE_INOTIFY
1329 if (fs_fd >= 0)
1330 close (fs_fd);
1331 #endif
1332
1333 if (backend_fd >= 0)
1334 close (backend_fd);
1335
1336 #if EV_USE_PORT
1337 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1338 #endif
1339 #if EV_USE_KQUEUE
1340 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1341 #endif
1342 #if EV_USE_EPOLL
1343 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1344 #endif
1345 #if EV_USE_POLL
1346 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1347 #endif
1348 #if EV_USE_SELECT
1349 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1350 #endif
1351
1352 for (i = NUMPRI; i--; )
1353 {
1354 array_free (pending, [i]);
1355 #if EV_IDLE_ENABLE
1356 array_free (idle, [i]);
1357 #endif
1358 }
1359
1360 ev_free (anfds); anfdmax = 0;
1361
1362 /* have to use the microsoft-never-gets-it-right macro */
1363 array_free (fdchange, EMPTY);
1364 array_free (timer, EMPTY);
1365 #if EV_PERIODIC_ENABLE
1366 array_free (periodic, EMPTY);
1367 #endif
1368 #if EV_FORK_ENABLE
1369 array_free (fork, EMPTY);
1370 #endif
1371 array_free (prepare, EMPTY);
1372 array_free (check, EMPTY);
1373 #if EV_ASYNC_ENABLE
1374 array_free (async, EMPTY);
1375 #endif
1376
1377 backend = 0;
1378 }
1379
1380 #if EV_USE_INOTIFY
1381 void inline_size infy_fork (EV_P);
1382 #endif
1383
1384 void inline_size
1385 loop_fork (EV_P)
1386 {
1387 #if EV_USE_PORT
1388 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1389 #endif
1390 #if EV_USE_KQUEUE
1391 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1392 #endif
1393 #if EV_USE_EPOLL
1394 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1395 #endif
1396 #if EV_USE_INOTIFY
1397 infy_fork (EV_A);
1398 #endif
1399
1400 if (ev_is_active (&pipeev))
1401 {
1402 /* this "locks" the handlers against writing to the pipe */
1403 /* while we modify the fd vars */
1404 gotsig = 1;
1405 #if EV_ASYNC_ENABLE
1406 gotasync = 1;
1407 #endif
1408
1409 ev_ref (EV_A);
1410 ev_io_stop (EV_A_ &pipeev);
1411
1412 #if EV_USE_EVENTFD
1413 if (evfd >= 0)
1414 close (evfd);
1415 #endif
1416
1417 if (evpipe [0] >= 0)
1418 {
1419 close (evpipe [0]);
1420 close (evpipe [1]);
1421 }
1422
1423 evpipe_init (EV_A);
1424 /* now iterate over everything, in case we missed something */
1425 pipecb (EV_A_ &pipeev, EV_READ);
1426 }
1427
1428 postfork = 0;
1429 }
1430
1431 #if EV_MULTIPLICITY
1432 struct ev_loop *
1433 ev_loop_new (unsigned int flags)
1434 {
1435 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1436
1437 memset (loop, 0, sizeof (struct ev_loop));
1438
1439 loop_init (EV_A_ flags);
1440
1441 if (ev_backend (EV_A))
1442 return loop;
1443
1444 return 0;
1445 }
1446
1447 void
1448 ev_loop_destroy (EV_P)
1449 {
1450 loop_destroy (EV_A);
1451 ev_free (loop);
1452 }
1453
1454 void
1455 ev_loop_fork (EV_P)
1456 {
1457 postfork = 1; /* must be in line with ev_default_fork */
1458 }
1459 #endif
1460
1461 #if EV_MULTIPLICITY
1462 struct ev_loop *
1463 ev_default_loop_init (unsigned int flags)
1464 #else
1465 int
1466 ev_default_loop (unsigned int flags)
1467 #endif
1468 {
1469 if (!ev_default_loop_ptr)
1470 {
1471 #if EV_MULTIPLICITY
1472 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1473 #else
1474 ev_default_loop_ptr = 1;
1475 #endif
1476
1477 loop_init (EV_A_ flags);
1478
1479 if (ev_backend (EV_A))
1480 {
1481 #ifndef _WIN32
1482 ev_signal_init (&childev, childcb, SIGCHLD);
1483 ev_set_priority (&childev, EV_MAXPRI);
1484 ev_signal_start (EV_A_ &childev);
1485 ev_unref (EV_A); /* child watcher should not keep loop alive */
1486 #endif
1487 }
1488 else
1489 ev_default_loop_ptr = 0;
1490 }
1491
1492 return ev_default_loop_ptr;
1493 }
1494
1495 void
1496 ev_default_destroy (void)
1497 {
1498 #if EV_MULTIPLICITY
1499 struct ev_loop *loop = ev_default_loop_ptr;
1500 #endif
1501
1502 #ifndef _WIN32
1503 ev_ref (EV_A); /* child watcher */
1504 ev_signal_stop (EV_A_ &childev);
1505 #endif
1506
1507 loop_destroy (EV_A);
1508 }
1509
1510 void
1511 ev_default_fork (void)
1512 {
1513 #if EV_MULTIPLICITY
1514 struct ev_loop *loop = ev_default_loop_ptr;
1515 #endif
1516
1517 if (backend)
1518 postfork = 1; /* must be in line with ev_loop_fork */
1519 }
1520
1521 /*****************************************************************************/
1522
1523 void
1524 ev_invoke (EV_P_ void *w, int revents)
1525 {
1526 EV_CB_INVOKE ((W)w, revents);
1527 }
1528
1529 void inline_speed
1530 call_pending (EV_P)
1531 {
1532 int pri;
1533
1534 for (pri = NUMPRI; pri--; )
1535 while (pendingcnt [pri])
1536 {
1537 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1538
1539 if (expect_true (p->w))
1540 {
1541 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1542
1543 p->w->pending = 0;
1544 EV_CB_INVOKE (p->w, p->events);
1545 }
1546 }
1547 }
1548
1549 #if EV_IDLE_ENABLE
1550 void inline_size
1551 idle_reify (EV_P)
1552 {
1553 if (expect_false (idleall))
1554 {
1555 int pri;
1556
1557 for (pri = NUMPRI; pri--; )
1558 {
1559 if (pendingcnt [pri])
1560 break;
1561
1562 if (idlecnt [pri])
1563 {
1564 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1565 break;
1566 }
1567 }
1568 }
1569 }
1570 #endif
1571
1572 void inline_size
1573 timers_reify (EV_P)
1574 {
1575 while (timercnt && ev_at (timers [HEAP0]) <= mn_now)
1576 {
1577 ev_timer *w = (ev_timer *)timers [HEAP0];
1578
1579 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1580
1581 /* first reschedule or stop timer */
1582 if (w->repeat)
1583 {
1584 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1585
1586 ev_at (w) += w->repeat;
1587 if (ev_at (w) < mn_now)
1588 ev_at (w) = mn_now;
1589
1590 downheap (timers, timercnt, HEAP0);
1591 }
1592 else
1593 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1594
1595 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1596 }
1597 }
1598
1599 #if EV_PERIODIC_ENABLE
1600 void inline_size
1601 periodics_reify (EV_P)
1602 {
1603 while (periodiccnt && ev_at (periodics [HEAP0]) <= ev_rt_now)
1604 {
1605 ev_periodic *w = (ev_periodic *)periodics [HEAP0];
1606
1607 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1608
1609 /* first reschedule or stop timer */
1610 if (w->reschedule_cb)
1611 {
1612 ev_at (w) = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1613 assert (("ev_periodic reschedule callback returned time in the past", ev_at (w) > ev_rt_now));
1614 downheap (periodics, periodiccnt, 1);
1615 }
1616 else if (w->interval)
1617 {
1618 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1619 if (ev_at (w) - ev_rt_now <= TIME_EPSILON) ev_at (w) += w->interval;
1620 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ev_at (w) > ev_rt_now));
1621 downheap (periodics, periodiccnt, HEAP0);
1622 }
1623 else
1624 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1625
1626 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1627 }
1628 }
1629
1630 static void noinline
1631 periodics_reschedule (EV_P)
1632 {
1633 int i;
1634
1635 /* adjust periodics after time jump */
1636 for (i = 1; i <= periodiccnt; ++i)
1637 {
1638 ev_periodic *w = (ev_periodic *)periodics [i];
1639
1640 if (w->reschedule_cb)
1641 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1642 else if (w->interval)
1643 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1644 }
1645
1646 /* now rebuild the heap */
1647 for (i = periodiccnt >> 1; --i; )
1648 downheap (periodics, periodiccnt, i + HEAP0);
1649 }
1650 #endif
1651
1652 void inline_speed
1653 time_update (EV_P_ ev_tstamp max_block)
1654 {
1655 int i;
1656
1657 #if EV_USE_MONOTONIC
1658 if (expect_true (have_monotonic))
1659 {
1660 ev_tstamp odiff = rtmn_diff;
1661
1662 mn_now = get_clock ();
1663
1664 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1665 /* interpolate in the meantime */
1666 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1667 {
1668 ev_rt_now = rtmn_diff + mn_now;
1669 return;
1670 }
1671
1672 now_floor = mn_now;
1673 ev_rt_now = ev_time ();
1674
1675 /* loop a few times, before making important decisions.
1676 * on the choice of "4": one iteration isn't enough,
1677 * in case we get preempted during the calls to
1678 * ev_time and get_clock. a second call is almost guaranteed
1679 * to succeed in that case, though. and looping a few more times
1680 * doesn't hurt either as we only do this on time-jumps or
1681 * in the unlikely event of having been preempted here.
1682 */
1683 for (i = 4; --i; )
1684 {
1685 rtmn_diff = ev_rt_now - mn_now;
1686
1687 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
1688 return; /* all is well */
1689
1690 ev_rt_now = ev_time ();
1691 mn_now = get_clock ();
1692 now_floor = mn_now;
1693 }
1694
1695 # if EV_PERIODIC_ENABLE
1696 periodics_reschedule (EV_A);
1697 # endif
1698 /* no timer adjustment, as the monotonic clock doesn't jump */
1699 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1700 }
1701 else
1702 #endif
1703 {
1704 ev_rt_now = ev_time ();
1705
1706 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1707 {
1708 #if EV_PERIODIC_ENABLE
1709 periodics_reschedule (EV_A);
1710 #endif
1711 /* adjust timers. this is easy, as the offset is the same for all of them */
1712 for (i = 1; i <= timercnt; ++i)
1713 ev_at (timers [i]) += ev_rt_now - mn_now;
1714 }
1715
1716 mn_now = ev_rt_now;
1717 }
1718 }
1719
1720 void
1721 ev_ref (EV_P)
1722 {
1723 ++activecnt;
1724 }
1725
1726 void
1727 ev_unref (EV_P)
1728 {
1729 --activecnt;
1730 }
1731
1732 static int loop_done;
1733
1734 void
1735 ev_loop (EV_P_ int flags)
1736 {
1737 loop_done = EVUNLOOP_CANCEL;
1738
1739 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1740
1741 do
1742 {
1743 #ifndef _WIN32
1744 if (expect_false (curpid)) /* penalise the forking check even more */
1745 if (expect_false (getpid () != curpid))
1746 {
1747 curpid = getpid ();
1748 postfork = 1;
1749 }
1750 #endif
1751
1752 #if EV_FORK_ENABLE
1753 /* we might have forked, so queue fork handlers */
1754 if (expect_false (postfork))
1755 if (forkcnt)
1756 {
1757 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1758 call_pending (EV_A);
1759 }
1760 #endif
1761
1762 /* queue prepare watchers (and execute them) */
1763 if (expect_false (preparecnt))
1764 {
1765 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1766 call_pending (EV_A);
1767 }
1768
1769 if (expect_false (!activecnt))
1770 break;
1771
1772 /* we might have forked, so reify kernel state if necessary */
1773 if (expect_false (postfork))
1774 loop_fork (EV_A);
1775
1776 /* update fd-related kernel structures */
1777 fd_reify (EV_A);
1778
1779 /* calculate blocking time */
1780 {
1781 ev_tstamp waittime = 0.;
1782 ev_tstamp sleeptime = 0.;
1783
1784 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1785 {
1786 /* update time to cancel out callback processing overhead */
1787 time_update (EV_A_ 1e100);
1788
1789 waittime = MAX_BLOCKTIME;
1790
1791 if (timercnt)
1792 {
1793 ev_tstamp to = ev_at (timers [HEAP0]) - mn_now + backend_fudge;
1794 if (waittime > to) waittime = to;
1795 }
1796
1797 #if EV_PERIODIC_ENABLE
1798 if (periodiccnt)
1799 {
1800 ev_tstamp to = ev_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
1801 if (waittime > to) waittime = to;
1802 }
1803 #endif
1804
1805 if (expect_false (waittime < timeout_blocktime))
1806 waittime = timeout_blocktime;
1807
1808 sleeptime = waittime - backend_fudge;
1809
1810 if (expect_true (sleeptime > io_blocktime))
1811 sleeptime = io_blocktime;
1812
1813 if (sleeptime)
1814 {
1815 ev_sleep (sleeptime);
1816 waittime -= sleeptime;
1817 }
1818 }
1819
1820 ++loop_count;
1821 backend_poll (EV_A_ waittime);
1822
1823 /* update ev_rt_now, do magic */
1824 time_update (EV_A_ waittime + sleeptime);
1825 }
1826
1827 /* queue pending timers and reschedule them */
1828 timers_reify (EV_A); /* relative timers called last */
1829 #if EV_PERIODIC_ENABLE
1830 periodics_reify (EV_A); /* absolute timers called first */
1831 #endif
1832
1833 #if EV_IDLE_ENABLE
1834 /* queue idle watchers unless other events are pending */
1835 idle_reify (EV_A);
1836 #endif
1837
1838 /* queue check watchers, to be executed first */
1839 if (expect_false (checkcnt))
1840 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1841
1842 call_pending (EV_A);
1843 }
1844 while (expect_true (
1845 activecnt
1846 && !loop_done
1847 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
1848 ));
1849
1850 if (loop_done == EVUNLOOP_ONE)
1851 loop_done = EVUNLOOP_CANCEL;
1852 }
1853
1854 void
1855 ev_unloop (EV_P_ int how)
1856 {
1857 loop_done = how;
1858 }
1859
1860 /*****************************************************************************/
1861
1862 void inline_size
1863 wlist_add (WL *head, WL elem)
1864 {
1865 elem->next = *head;
1866 *head = elem;
1867 }
1868
1869 void inline_size
1870 wlist_del (WL *head, WL elem)
1871 {
1872 while (*head)
1873 {
1874 if (*head == elem)
1875 {
1876 *head = elem->next;
1877 return;
1878 }
1879
1880 head = &(*head)->next;
1881 }
1882 }
1883
1884 void inline_speed
1885 clear_pending (EV_P_ W w)
1886 {
1887 if (w->pending)
1888 {
1889 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1890 w->pending = 0;
1891 }
1892 }
1893
1894 int
1895 ev_clear_pending (EV_P_ void *w)
1896 {
1897 W w_ = (W)w;
1898 int pending = w_->pending;
1899
1900 if (expect_true (pending))
1901 {
1902 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1903 w_->pending = 0;
1904 p->w = 0;
1905 return p->events;
1906 }
1907 else
1908 return 0;
1909 }
1910
1911 void inline_size
1912 pri_adjust (EV_P_ W w)
1913 {
1914 int pri = w->priority;
1915 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1916 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1917 w->priority = pri;
1918 }
1919
1920 void inline_speed
1921 ev_start (EV_P_ W w, int active)
1922 {
1923 pri_adjust (EV_A_ w);
1924 w->active = active;
1925 ev_ref (EV_A);
1926 }
1927
1928 void inline_size
1929 ev_stop (EV_P_ W w)
1930 {
1931 ev_unref (EV_A);
1932 w->active = 0;
1933 }
1934
1935 /*****************************************************************************/
1936
1937 void noinline
1938 ev_io_start (EV_P_ ev_io *w)
1939 {
1940 int fd = w->fd;
1941
1942 if (expect_false (ev_is_active (w)))
1943 return;
1944
1945 assert (("ev_io_start called with negative fd", fd >= 0));
1946
1947 ev_start (EV_A_ (W)w, 1);
1948 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1949 wlist_add (&anfds[fd].head, (WL)w);
1950
1951 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1952 w->events &= ~EV_IOFDSET;
1953 }
1954
1955 void noinline
1956 ev_io_stop (EV_P_ ev_io *w)
1957 {
1958 clear_pending (EV_A_ (W)w);
1959 if (expect_false (!ev_is_active (w)))
1960 return;
1961
1962 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1963
1964 wlist_del (&anfds[w->fd].head, (WL)w);
1965 ev_stop (EV_A_ (W)w);
1966
1967 fd_change (EV_A_ w->fd, 1);
1968 }
1969
1970 void noinline
1971 ev_timer_start (EV_P_ ev_timer *w)
1972 {
1973 if (expect_false (ev_is_active (w)))
1974 return;
1975
1976 ev_at (w) += mn_now;
1977
1978 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1979
1980 ev_start (EV_A_ (W)w, ++timercnt + HEAP0 - 1);
1981 array_needsize (WT, timers, timermax, timercnt + HEAP0, EMPTY2);
1982 timers [ev_active (w)] = (WT)w;
1983 upheap (timers, ev_active (w));
1984
1985 /*assert (("internal timer heap corruption", timers [ev_active (w)] == w));*/
1986 }
1987
1988 void noinline
1989 ev_timer_stop (EV_P_ ev_timer *w)
1990 {
1991 clear_pending (EV_A_ (W)w);
1992 if (expect_false (!ev_is_active (w)))
1993 return;
1994
1995 {
1996 int active = ev_active (w);
1997
1998 assert (("internal timer heap corruption", timers [active] == (WT)w));
1999
2000 if (expect_true (active < timercnt + HEAP0 - 1))
2001 {
2002 timers [active] = timers [timercnt + HEAP0 - 1];
2003 adjustheap (timers, timercnt, active);
2004 }
2005
2006 --timercnt;
2007 }
2008
2009 ev_at (w) -= mn_now;
2010
2011 ev_stop (EV_A_ (W)w);
2012 }
2013
2014 void noinline
2015 ev_timer_again (EV_P_ ev_timer *w)
2016 {
2017 if (ev_is_active (w))
2018 {
2019 if (w->repeat)
2020 {
2021 ev_at (w) = mn_now + w->repeat;
2022 adjustheap (timers, timercnt, ev_active (w));
2023 }
2024 else
2025 ev_timer_stop (EV_A_ w);
2026 }
2027 else if (w->repeat)
2028 {
2029 ev_at (w) = w->repeat;
2030 ev_timer_start (EV_A_ w);
2031 }
2032 }
2033
2034 #if EV_PERIODIC_ENABLE
2035 void noinline
2036 ev_periodic_start (EV_P_ ev_periodic *w)
2037 {
2038 if (expect_false (ev_is_active (w)))
2039 return;
2040
2041 if (w->reschedule_cb)
2042 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2043 else if (w->interval)
2044 {
2045 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
2046 /* this formula differs from the one in periodic_reify because we do not always round up */
2047 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2048 }
2049 else
2050 ev_at (w) = w->offset;
2051
2052 ev_start (EV_A_ (W)w, ++periodiccnt + HEAP0 - 1);
2053 array_needsize (WT, periodics, periodicmax, periodiccnt + HEAP0, EMPTY2);
2054 periodics [ev_active (w)] = (WT)w;
2055 upheap (periodics, ev_active (w));
2056
2057 /*assert (("internal periodic heap corruption", periodics [ev_active (w)] == w));*/
2058 }
2059
2060 void noinline
2061 ev_periodic_stop (EV_P_ ev_periodic *w)
2062 {
2063 clear_pending (EV_A_ (W)w);
2064 if (expect_false (!ev_is_active (w)))
2065 return;
2066
2067 {
2068 int active = ev_active (w);
2069
2070 assert (("internal periodic heap corruption", periodics [active] == (WT)w));
2071
2072 if (expect_true (active < periodiccnt + HEAP0 - 1))
2073 {
2074 periodics [active] = periodics [periodiccnt + HEAP0 - 1];
2075 adjustheap (periodics, periodiccnt, active);
2076 }
2077
2078 --periodiccnt;
2079 }
2080
2081 ev_stop (EV_A_ (W)w);
2082 }
2083
2084 void noinline
2085 ev_periodic_again (EV_P_ ev_periodic *w)
2086 {
2087 /* TODO: use adjustheap and recalculation */
2088 ev_periodic_stop (EV_A_ w);
2089 ev_periodic_start (EV_A_ w);
2090 }
2091 #endif
2092
2093 #ifndef SA_RESTART
2094 # define SA_RESTART 0
2095 #endif
2096
2097 void noinline
2098 ev_signal_start (EV_P_ ev_signal *w)
2099 {
2100 #if EV_MULTIPLICITY
2101 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2102 #endif
2103 if (expect_false (ev_is_active (w)))
2104 return;
2105
2106 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2107
2108 evpipe_init (EV_A);
2109
2110 {
2111 #ifndef _WIN32
2112 sigset_t full, prev;
2113 sigfillset (&full);
2114 sigprocmask (SIG_SETMASK, &full, &prev);
2115 #endif
2116
2117 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2118
2119 #ifndef _WIN32
2120 sigprocmask (SIG_SETMASK, &prev, 0);
2121 #endif
2122 }
2123
2124 ev_start (EV_A_ (W)w, 1);
2125 wlist_add (&signals [w->signum - 1].head, (WL)w);
2126
2127 if (!((WL)w)->next)
2128 {
2129 #if _WIN32
2130 signal (w->signum, ev_sighandler);
2131 #else
2132 struct sigaction sa;
2133 sa.sa_handler = ev_sighandler;
2134 sigfillset (&sa.sa_mask);
2135 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2136 sigaction (w->signum, &sa, 0);
2137 #endif
2138 }
2139 }
2140
2141 void noinline
2142 ev_signal_stop (EV_P_ ev_signal *w)
2143 {
2144 clear_pending (EV_A_ (W)w);
2145 if (expect_false (!ev_is_active (w)))
2146 return;
2147
2148 wlist_del (&signals [w->signum - 1].head, (WL)w);
2149 ev_stop (EV_A_ (W)w);
2150
2151 if (!signals [w->signum - 1].head)
2152 signal (w->signum, SIG_DFL);
2153 }
2154
2155 void
2156 ev_child_start (EV_P_ ev_child *w)
2157 {
2158 #if EV_MULTIPLICITY
2159 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2160 #endif
2161 if (expect_false (ev_is_active (w)))
2162 return;
2163
2164 ev_start (EV_A_ (W)w, 1);
2165 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2166 }
2167
2168 void
2169 ev_child_stop (EV_P_ ev_child *w)
2170 {
2171 clear_pending (EV_A_ (W)w);
2172 if (expect_false (!ev_is_active (w)))
2173 return;
2174
2175 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2176 ev_stop (EV_A_ (W)w);
2177 }
2178
2179 #if EV_STAT_ENABLE
2180
2181 # ifdef _WIN32
2182 # undef lstat
2183 # define lstat(a,b) _stati64 (a,b)
2184 # endif
2185
2186 #define DEF_STAT_INTERVAL 5.0074891
2187 #define MIN_STAT_INTERVAL 0.1074891
2188
2189 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2190
2191 #if EV_USE_INOTIFY
2192 # define EV_INOTIFY_BUFSIZE 8192
2193
2194 static void noinline
2195 infy_add (EV_P_ ev_stat *w)
2196 {
2197 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);
2198
2199 if (w->wd < 0)
2200 {
2201 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2202
2203 /* monitor some parent directory for speedup hints */
2204 /* note that exceeding the hardcoded limit is not a correctness issue, */
2205 /* but an efficiency issue only */
2206 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2207 {
2208 char path [4096];
2209 strcpy (path, w->path);
2210
2211 do
2212 {
2213 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2214 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2215
2216 char *pend = strrchr (path, '/');
2217
2218 if (!pend)
2219 break; /* whoops, no '/', complain to your admin */
2220
2221 *pend = 0;
2222 w->wd = inotify_add_watch (fs_fd, path, mask);
2223 }
2224 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2225 }
2226 }
2227 else
2228 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2229
2230 if (w->wd >= 0)
2231 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2232 }
2233
2234 static void noinline
2235 infy_del (EV_P_ ev_stat *w)
2236 {
2237 int slot;
2238 int wd = w->wd;
2239
2240 if (wd < 0)
2241 return;
2242
2243 w->wd = -2;
2244 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2245 wlist_del (&fs_hash [slot].head, (WL)w);
2246
2247 /* remove this watcher, if others are watching it, they will rearm */
2248 inotify_rm_watch (fs_fd, wd);
2249 }
2250
2251 static void noinline
2252 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2253 {
2254 if (slot < 0)
2255 /* overflow, need to check for all hahs slots */
2256 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2257 infy_wd (EV_A_ slot, wd, ev);
2258 else
2259 {
2260 WL w_;
2261
2262 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2263 {
2264 ev_stat *w = (ev_stat *)w_;
2265 w_ = w_->next; /* lets us remove this watcher and all before it */
2266
2267 if (w->wd == wd || wd == -1)
2268 {
2269 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2270 {
2271 w->wd = -1;
2272 infy_add (EV_A_ w); /* re-add, no matter what */
2273 }
2274
2275 stat_timer_cb (EV_A_ &w->timer, 0);
2276 }
2277 }
2278 }
2279 }
2280
2281 static void
2282 infy_cb (EV_P_ ev_io *w, int revents)
2283 {
2284 char buf [EV_INOTIFY_BUFSIZE];
2285 struct inotify_event *ev = (struct inotify_event *)buf;
2286 int ofs;
2287 int len = read (fs_fd, buf, sizeof (buf));
2288
2289 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2290 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2291 }
2292
2293 void inline_size
2294 infy_init (EV_P)
2295 {
2296 if (fs_fd != -2)
2297 return;
2298
2299 fs_fd = inotify_init ();
2300
2301 if (fs_fd >= 0)
2302 {
2303 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2304 ev_set_priority (&fs_w, EV_MAXPRI);
2305 ev_io_start (EV_A_ &fs_w);
2306 }
2307 }
2308
2309 void inline_size
2310 infy_fork (EV_P)
2311 {
2312 int slot;
2313
2314 if (fs_fd < 0)
2315 return;
2316
2317 close (fs_fd);
2318 fs_fd = inotify_init ();
2319
2320 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2321 {
2322 WL w_ = fs_hash [slot].head;
2323 fs_hash [slot].head = 0;
2324
2325 while (w_)
2326 {
2327 ev_stat *w = (ev_stat *)w_;
2328 w_ = w_->next; /* lets us add this watcher */
2329
2330 w->wd = -1;
2331
2332 if (fs_fd >= 0)
2333 infy_add (EV_A_ w); /* re-add, no matter what */
2334 else
2335 ev_timer_start (EV_A_ &w->timer);
2336 }
2337
2338 }
2339 }
2340
2341 #endif
2342
2343 void
2344 ev_stat_stat (EV_P_ ev_stat *w)
2345 {
2346 if (lstat (w->path, &w->attr) < 0)
2347 w->attr.st_nlink = 0;
2348 else if (!w->attr.st_nlink)
2349 w->attr.st_nlink = 1;
2350 }
2351
2352 static void noinline
2353 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2354 {
2355 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2356
2357 /* we copy this here each the time so that */
2358 /* prev has the old value when the callback gets invoked */
2359 w->prev = w->attr;
2360 ev_stat_stat (EV_A_ w);
2361
2362 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2363 if (
2364 w->prev.st_dev != w->attr.st_dev
2365 || w->prev.st_ino != w->attr.st_ino
2366 || w->prev.st_mode != w->attr.st_mode
2367 || w->prev.st_nlink != w->attr.st_nlink
2368 || w->prev.st_uid != w->attr.st_uid
2369 || w->prev.st_gid != w->attr.st_gid
2370 || w->prev.st_rdev != w->attr.st_rdev
2371 || w->prev.st_size != w->attr.st_size
2372 || w->prev.st_atime != w->attr.st_atime
2373 || w->prev.st_mtime != w->attr.st_mtime
2374 || w->prev.st_ctime != w->attr.st_ctime
2375 ) {
2376 #if EV_USE_INOTIFY
2377 infy_del (EV_A_ w);
2378 infy_add (EV_A_ w);
2379 ev_stat_stat (EV_A_ w); /* avoid race... */
2380 #endif
2381
2382 ev_feed_event (EV_A_ w, EV_STAT);
2383 }
2384 }
2385
2386 void
2387 ev_stat_start (EV_P_ ev_stat *w)
2388 {
2389 if (expect_false (ev_is_active (w)))
2390 return;
2391
2392 /* since we use memcmp, we need to clear any padding data etc. */
2393 memset (&w->prev, 0, sizeof (ev_statdata));
2394 memset (&w->attr, 0, sizeof (ev_statdata));
2395
2396 ev_stat_stat (EV_A_ w);
2397
2398 if (w->interval < MIN_STAT_INTERVAL)
2399 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2400
2401 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2402 ev_set_priority (&w->timer, ev_priority (w));
2403
2404 #if EV_USE_INOTIFY
2405 infy_init (EV_A);
2406
2407 if (fs_fd >= 0)
2408 infy_add (EV_A_ w);
2409 else
2410 #endif
2411 ev_timer_start (EV_A_ &w->timer);
2412
2413 ev_start (EV_A_ (W)w, 1);
2414 }
2415
2416 void
2417 ev_stat_stop (EV_P_ ev_stat *w)
2418 {
2419 clear_pending (EV_A_ (W)w);
2420 if (expect_false (!ev_is_active (w)))
2421 return;
2422
2423 #if EV_USE_INOTIFY
2424 infy_del (EV_A_ w);
2425 #endif
2426 ev_timer_stop (EV_A_ &w->timer);
2427
2428 ev_stop (EV_A_ (W)w);
2429 }
2430 #endif
2431
2432 #if EV_IDLE_ENABLE
2433 void
2434 ev_idle_start (EV_P_ ev_idle *w)
2435 {
2436 if (expect_false (ev_is_active (w)))
2437 return;
2438
2439 pri_adjust (EV_A_ (W)w);
2440
2441 {
2442 int active = ++idlecnt [ABSPRI (w)];
2443
2444 ++idleall;
2445 ev_start (EV_A_ (W)w, active);
2446
2447 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2448 idles [ABSPRI (w)][active - 1] = w;
2449 }
2450 }
2451
2452 void
2453 ev_idle_stop (EV_P_ ev_idle *w)
2454 {
2455 clear_pending (EV_A_ (W)w);
2456 if (expect_false (!ev_is_active (w)))
2457 return;
2458
2459 {
2460 int active = ev_active (w);
2461
2462 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2463 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2464
2465 ev_stop (EV_A_ (W)w);
2466 --idleall;
2467 }
2468 }
2469 #endif
2470
2471 void
2472 ev_prepare_start (EV_P_ ev_prepare *w)
2473 {
2474 if (expect_false (ev_is_active (w)))
2475 return;
2476
2477 ev_start (EV_A_ (W)w, ++preparecnt);
2478 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2479 prepares [preparecnt - 1] = w;
2480 }
2481
2482 void
2483 ev_prepare_stop (EV_P_ ev_prepare *w)
2484 {
2485 clear_pending (EV_A_ (W)w);
2486 if (expect_false (!ev_is_active (w)))
2487 return;
2488
2489 {
2490 int active = ev_active (w);
2491
2492 prepares [active - 1] = prepares [--preparecnt];
2493 ev_active (prepares [active - 1]) = active;
2494 }
2495
2496 ev_stop (EV_A_ (W)w);
2497 }
2498
2499 void
2500 ev_check_start (EV_P_ ev_check *w)
2501 {
2502 if (expect_false (ev_is_active (w)))
2503 return;
2504
2505 ev_start (EV_A_ (W)w, ++checkcnt);
2506 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2507 checks [checkcnt - 1] = w;
2508 }
2509
2510 void
2511 ev_check_stop (EV_P_ ev_check *w)
2512 {
2513 clear_pending (EV_A_ (W)w);
2514 if (expect_false (!ev_is_active (w)))
2515 return;
2516
2517 {
2518 int active = ev_active (w);
2519
2520 checks [active - 1] = checks [--checkcnt];
2521 ev_active (checks [active - 1]) = active;
2522 }
2523
2524 ev_stop (EV_A_ (W)w);
2525 }
2526
2527 #if EV_EMBED_ENABLE
2528 void noinline
2529 ev_embed_sweep (EV_P_ ev_embed *w)
2530 {
2531 ev_loop (w->other, EVLOOP_NONBLOCK);
2532 }
2533
2534 static void
2535 embed_io_cb (EV_P_ ev_io *io, int revents)
2536 {
2537 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2538
2539 if (ev_cb (w))
2540 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2541 else
2542 ev_loop (w->other, EVLOOP_NONBLOCK);
2543 }
2544
2545 static void
2546 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2547 {
2548 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2549
2550 {
2551 struct ev_loop *loop = w->other;
2552
2553 while (fdchangecnt)
2554 {
2555 fd_reify (EV_A);
2556 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2557 }
2558 }
2559 }
2560
2561 #if 0
2562 static void
2563 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2564 {
2565 ev_idle_stop (EV_A_ idle);
2566 }
2567 #endif
2568
2569 void
2570 ev_embed_start (EV_P_ ev_embed *w)
2571 {
2572 if (expect_false (ev_is_active (w)))
2573 return;
2574
2575 {
2576 struct ev_loop *loop = w->other;
2577 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2578 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2579 }
2580
2581 ev_set_priority (&w->io, ev_priority (w));
2582 ev_io_start (EV_A_ &w->io);
2583
2584 ev_prepare_init (&w->prepare, embed_prepare_cb);
2585 ev_set_priority (&w->prepare, EV_MINPRI);
2586 ev_prepare_start (EV_A_ &w->prepare);
2587
2588 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2589
2590 ev_start (EV_A_ (W)w, 1);
2591 }
2592
2593 void
2594 ev_embed_stop (EV_P_ ev_embed *w)
2595 {
2596 clear_pending (EV_A_ (W)w);
2597 if (expect_false (!ev_is_active (w)))
2598 return;
2599
2600 ev_io_stop (EV_A_ &w->io);
2601 ev_prepare_stop (EV_A_ &w->prepare);
2602
2603 ev_stop (EV_A_ (W)w);
2604 }
2605 #endif
2606
2607 #if EV_FORK_ENABLE
2608 void
2609 ev_fork_start (EV_P_ ev_fork *w)
2610 {
2611 if (expect_false (ev_is_active (w)))
2612 return;
2613
2614 ev_start (EV_A_ (W)w, ++forkcnt);
2615 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2616 forks [forkcnt - 1] = w;
2617 }
2618
2619 void
2620 ev_fork_stop (EV_P_ ev_fork *w)
2621 {
2622 clear_pending (EV_A_ (W)w);
2623 if (expect_false (!ev_is_active (w)))
2624 return;
2625
2626 {
2627 int active = ev_active (w);
2628
2629 forks [active - 1] = forks [--forkcnt];
2630 ev_active (forks [active - 1]) = active;
2631 }
2632
2633 ev_stop (EV_A_ (W)w);
2634 }
2635 #endif
2636
2637 #if EV_ASYNC_ENABLE
2638 void
2639 ev_async_start (EV_P_ ev_async *w)
2640 {
2641 if (expect_false (ev_is_active (w)))
2642 return;
2643
2644 evpipe_init (EV_A);
2645
2646 ev_start (EV_A_ (W)w, ++asynccnt);
2647 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2648 asyncs [asynccnt - 1] = w;
2649 }
2650
2651 void
2652 ev_async_stop (EV_P_ ev_async *w)
2653 {
2654 clear_pending (EV_A_ (W)w);
2655 if (expect_false (!ev_is_active (w)))
2656 return;
2657
2658 {
2659 int active = ev_active (w);
2660
2661 asyncs [active - 1] = asyncs [--asynccnt];
2662 ev_active (asyncs [active - 1]) = active;
2663 }
2664
2665 ev_stop (EV_A_ (W)w);
2666 }
2667
2668 void
2669 ev_async_send (EV_P_ ev_async *w)
2670 {
2671 w->sent = 1;
2672 evpipe_write (EV_A_ &gotasync);
2673 }
2674 #endif
2675
2676 /*****************************************************************************/
2677
2678 struct ev_once
2679 {
2680 ev_io io;
2681 ev_timer to;
2682 void (*cb)(int revents, void *arg);
2683 void *arg;
2684 };
2685
2686 static void
2687 once_cb (EV_P_ struct ev_once *once, int revents)
2688 {
2689 void (*cb)(int revents, void *arg) = once->cb;
2690 void *arg = once->arg;
2691
2692 ev_io_stop (EV_A_ &once->io);
2693 ev_timer_stop (EV_A_ &once->to);
2694 ev_free (once);
2695
2696 cb (revents, arg);
2697 }
2698
2699 static void
2700 once_cb_io (EV_P_ ev_io *w, int revents)
2701 {
2702 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2703 }
2704
2705 static void
2706 once_cb_to (EV_P_ ev_timer *w, int revents)
2707 {
2708 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2709 }
2710
2711 void
2712 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2713 {
2714 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2715
2716 if (expect_false (!once))
2717 {
2718 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2719 return;
2720 }
2721
2722 once->cb = cb;
2723 once->arg = arg;
2724
2725 ev_init (&once->io, once_cb_io);
2726 if (fd >= 0)
2727 {
2728 ev_io_set (&once->io, fd, events);
2729 ev_io_start (EV_A_ &once->io);
2730 }
2731
2732 ev_init (&once->to, once_cb_to);
2733 if (timeout >= 0.)
2734 {
2735 ev_timer_set (&once->to, timeout, 0.);
2736 ev_timer_start (EV_A_ &once->to);
2737 }
2738 }
2739
2740 #if EV_MULTIPLICITY
2741 #include "ev_wrap.h"
2742 #endif
2743
2744 #ifdef __cplusplus
2745 }
2746 #endif
2747