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Revision: 1.237
Committed: Wed May 7 15:16:56 2008 UTC (16 years, 2 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.236: +5 -4 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 DHEAP 4
774 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
775
776 /* towards the root */
777 void inline_speed
778 upheap (WT *heap, int k)
779 {
780 WT w = heap [k];
781
782 for (;;)
783 {
784 int p = ((k - HEAP0 - 1) / DHEAP) + HEAP0;
785
786 if (p >= HEAP0 || heap [p]->at <= w->at)
787 break;
788
789 heap [k] = heap [p];
790 ev_active (heap [k]) = k;
791 k = p;
792 }
793
794 heap [k] = w;
795 ev_active (heap [k]) = k;
796 }
797
798 /* away from the root */
799 void inline_speed
800 downheap (WT *heap, int N, int k)
801 {
802 WT w = heap [k];
803 WT *E = heap + N + HEAP0;
804
805 for (;;)
806 {
807 ev_tstamp minat;
808 WT *minpos;
809 WT *pos = heap + DHEAP * (k - HEAP0) + HEAP0;
810
811 // find minimum child
812 if (expect_true (pos + DHEAP - 1 < E))
813 {
814 /* fast path */
815 (minpos = pos + 0), (minat = (*minpos)->at);
816 if (pos [1]->at < minat) (minpos = pos + 1), (minat = (*minpos)->at);
817 if (pos [2]->at < minat) (minpos = pos + 2), (minat = (*minpos)->at);
818 if (pos [3]->at < minat) (minpos = pos + 3), (minat = (*minpos)->at);
819 }
820 else
821 {
822 /* slow path */
823 if (pos >= E)
824 break;
825 (minpos = pos + 0), (minat = (*minpos)->at);
826 if (pos + 1 < E && pos [1]->at < minat) (minpos = pos + 1), (minat = (*minpos)->at);
827 if (pos + 2 < E && pos [2]->at < minat) (minpos = pos + 2), (minat = (*minpos)->at);
828 if (pos + 3 < E && pos [3]->at < minat) (minpos = pos + 3), (minat = (*minpos)->at);
829 }
830
831 if (w->at <= minat)
832 break;
833
834 ev_active (*minpos) = k;
835 heap [k] = *minpos;
836
837 k = minpos - heap;
838 }
839
840 heap [k] = w;
841 ev_active (heap [k]) = k;
842 }
843
844 #else // 4HEAP
845
846 #define HEAP0 1
847
848 /* towards the root */
849 void inline_speed
850 upheap (WT *heap, int k)
851 {
852 WT w = heap [k];
853
854 for (;;)
855 {
856 int p = k >> 1;
857
858 /* maybe we could use a dummy element at heap [0]? */
859 if (!p || heap [p]->at <= w->at)
860 break;
861
862 heap [k] = heap [p];
863 ev_active (heap [k]) = k;
864 k = p;
865 }
866
867 heap [k] = w;
868 ev_active (heap [k]) = k;
869 }
870
871 /* away from the root */
872 void inline_speed
873 downheap (WT *heap, int N, int k)
874 {
875 WT w = heap [k];
876
877 for (;;)
878 {
879 int c = k << 1;
880
881 if (c > N)
882 break;
883
884 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
885 ? 1 : 0;
886
887 if (w->at <= heap [c]->at)
888 break;
889
890 heap [k] = heap [c];
891 ((W)heap [k])->active = k;
892
893 k = c;
894 }
895
896 heap [k] = w;
897 ev_active (heap [k]) = k;
898 }
899 #endif
900
901 void inline_size
902 adjustheap (WT *heap, int N, int k)
903 {
904 upheap (heap, k);
905 downheap (heap, N, k);
906 }
907
908 /*****************************************************************************/
909
910 typedef struct
911 {
912 WL head;
913 EV_ATOMIC_T gotsig;
914 } ANSIG;
915
916 static ANSIG *signals;
917 static int signalmax;
918
919 static EV_ATOMIC_T gotsig;
920
921 void inline_size
922 signals_init (ANSIG *base, int count)
923 {
924 while (count--)
925 {
926 base->head = 0;
927 base->gotsig = 0;
928
929 ++base;
930 }
931 }
932
933 /*****************************************************************************/
934
935 void inline_speed
936 fd_intern (int fd)
937 {
938 #ifdef _WIN32
939 int arg = 1;
940 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
941 #else
942 fcntl (fd, F_SETFD, FD_CLOEXEC);
943 fcntl (fd, F_SETFL, O_NONBLOCK);
944 #endif
945 }
946
947 static void noinline
948 evpipe_init (EV_P)
949 {
950 if (!ev_is_active (&pipeev))
951 {
952 #if EV_USE_EVENTFD
953 if ((evfd = eventfd (0, 0)) >= 0)
954 {
955 evpipe [0] = -1;
956 fd_intern (evfd);
957 ev_io_set (&pipeev, evfd, EV_READ);
958 }
959 else
960 #endif
961 {
962 while (pipe (evpipe))
963 syserr ("(libev) error creating signal/async pipe");
964
965 fd_intern (evpipe [0]);
966 fd_intern (evpipe [1]);
967 ev_io_set (&pipeev, evpipe [0], EV_READ);
968 }
969
970 ev_io_start (EV_A_ &pipeev);
971 ev_unref (EV_A); /* watcher should not keep loop alive */
972 }
973 }
974
975 void inline_size
976 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
977 {
978 if (!*flag)
979 {
980 int old_errno = errno; /* save errno because write might clobber it */
981
982 *flag = 1;
983
984 #if EV_USE_EVENTFD
985 if (evfd >= 0)
986 {
987 uint64_t counter = 1;
988 write (evfd, &counter, sizeof (uint64_t));
989 }
990 else
991 #endif
992 write (evpipe [1], &old_errno, 1);
993
994 errno = old_errno;
995 }
996 }
997
998 static void
999 pipecb (EV_P_ ev_io *iow, int revents)
1000 {
1001 #if EV_USE_EVENTFD
1002 if (evfd >= 0)
1003 {
1004 uint64_t counter;
1005 read (evfd, &counter, sizeof (uint64_t));
1006 }
1007 else
1008 #endif
1009 {
1010 char dummy;
1011 read (evpipe [0], &dummy, 1);
1012 }
1013
1014 if (gotsig && ev_is_default_loop (EV_A))
1015 {
1016 int signum;
1017 gotsig = 0;
1018
1019 for (signum = signalmax; signum--; )
1020 if (signals [signum].gotsig)
1021 ev_feed_signal_event (EV_A_ signum + 1);
1022 }
1023
1024 #if EV_ASYNC_ENABLE
1025 if (gotasync)
1026 {
1027 int i;
1028 gotasync = 0;
1029
1030 for (i = asynccnt; i--; )
1031 if (asyncs [i]->sent)
1032 {
1033 asyncs [i]->sent = 0;
1034 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1035 }
1036 }
1037 #endif
1038 }
1039
1040 /*****************************************************************************/
1041
1042 static void
1043 ev_sighandler (int signum)
1044 {
1045 #if EV_MULTIPLICITY
1046 struct ev_loop *loop = &default_loop_struct;
1047 #endif
1048
1049 #if _WIN32
1050 signal (signum, ev_sighandler);
1051 #endif
1052
1053 signals [signum - 1].gotsig = 1;
1054 evpipe_write (EV_A_ &gotsig);
1055 }
1056
1057 void noinline
1058 ev_feed_signal_event (EV_P_ int signum)
1059 {
1060 WL w;
1061
1062 #if EV_MULTIPLICITY
1063 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1064 #endif
1065
1066 --signum;
1067
1068 if (signum < 0 || signum >= signalmax)
1069 return;
1070
1071 signals [signum].gotsig = 0;
1072
1073 for (w = signals [signum].head; w; w = w->next)
1074 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1075 }
1076
1077 /*****************************************************************************/
1078
1079 static WL childs [EV_PID_HASHSIZE];
1080
1081 #ifndef _WIN32
1082
1083 static ev_signal childev;
1084
1085 #ifndef WIFCONTINUED
1086 # define WIFCONTINUED(status) 0
1087 #endif
1088
1089 void inline_speed
1090 child_reap (EV_P_ int chain, int pid, int status)
1091 {
1092 ev_child *w;
1093 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1094
1095 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1096 {
1097 if ((w->pid == pid || !w->pid)
1098 && (!traced || (w->flags & 1)))
1099 {
1100 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1101 w->rpid = pid;
1102 w->rstatus = status;
1103 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1104 }
1105 }
1106 }
1107
1108 #ifndef WCONTINUED
1109 # define WCONTINUED 0
1110 #endif
1111
1112 static void
1113 childcb (EV_P_ ev_signal *sw, int revents)
1114 {
1115 int pid, status;
1116
1117 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1118 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1119 if (!WCONTINUED
1120 || errno != EINVAL
1121 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1122 return;
1123
1124 /* make sure we are called again until all children have been reaped */
1125 /* we need to do it this way so that the callback gets called before we continue */
1126 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1127
1128 child_reap (EV_A_ pid, pid, status);
1129 if (EV_PID_HASHSIZE > 1)
1130 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1131 }
1132
1133 #endif
1134
1135 /*****************************************************************************/
1136
1137 #if EV_USE_PORT
1138 # include "ev_port.c"
1139 #endif
1140 #if EV_USE_KQUEUE
1141 # include "ev_kqueue.c"
1142 #endif
1143 #if EV_USE_EPOLL
1144 # include "ev_epoll.c"
1145 #endif
1146 #if EV_USE_POLL
1147 # include "ev_poll.c"
1148 #endif
1149 #if EV_USE_SELECT
1150 # include "ev_select.c"
1151 #endif
1152
1153 int
1154 ev_version_major (void)
1155 {
1156 return EV_VERSION_MAJOR;
1157 }
1158
1159 int
1160 ev_version_minor (void)
1161 {
1162 return EV_VERSION_MINOR;
1163 }
1164
1165 /* return true if we are running with elevated privileges and should ignore env variables */
1166 int inline_size
1167 enable_secure (void)
1168 {
1169 #ifdef _WIN32
1170 return 0;
1171 #else
1172 return getuid () != geteuid ()
1173 || getgid () != getegid ();
1174 #endif
1175 }
1176
1177 unsigned int
1178 ev_supported_backends (void)
1179 {
1180 unsigned int flags = 0;
1181
1182 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1183 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1184 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1185 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1186 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1187
1188 return flags;
1189 }
1190
1191 unsigned int
1192 ev_recommended_backends (void)
1193 {
1194 unsigned int flags = ev_supported_backends ();
1195
1196 #ifndef __NetBSD__
1197 /* kqueue is borked on everything but netbsd apparently */
1198 /* it usually doesn't work correctly on anything but sockets and pipes */
1199 flags &= ~EVBACKEND_KQUEUE;
1200 #endif
1201 #ifdef __APPLE__
1202 // flags &= ~EVBACKEND_KQUEUE; for documentation
1203 flags &= ~EVBACKEND_POLL;
1204 #endif
1205
1206 return flags;
1207 }
1208
1209 unsigned int
1210 ev_embeddable_backends (void)
1211 {
1212 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1213
1214 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1215 /* please fix it and tell me how to detect the fix */
1216 flags &= ~EVBACKEND_EPOLL;
1217
1218 return flags;
1219 }
1220
1221 unsigned int
1222 ev_backend (EV_P)
1223 {
1224 return backend;
1225 }
1226
1227 unsigned int
1228 ev_loop_count (EV_P)
1229 {
1230 return loop_count;
1231 }
1232
1233 void
1234 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1235 {
1236 io_blocktime = interval;
1237 }
1238
1239 void
1240 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1241 {
1242 timeout_blocktime = interval;
1243 }
1244
1245 static void noinline
1246 loop_init (EV_P_ unsigned int flags)
1247 {
1248 if (!backend)
1249 {
1250 #if EV_USE_MONOTONIC
1251 {
1252 struct timespec ts;
1253 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1254 have_monotonic = 1;
1255 }
1256 #endif
1257
1258 ev_rt_now = ev_time ();
1259 mn_now = get_clock ();
1260 now_floor = mn_now;
1261 rtmn_diff = ev_rt_now - mn_now;
1262
1263 io_blocktime = 0.;
1264 timeout_blocktime = 0.;
1265 backend = 0;
1266 backend_fd = -1;
1267 gotasync = 0;
1268 #if EV_USE_INOTIFY
1269 fs_fd = -2;
1270 #endif
1271
1272 /* pid check not overridable via env */
1273 #ifndef _WIN32
1274 if (flags & EVFLAG_FORKCHECK)
1275 curpid = getpid ();
1276 #endif
1277
1278 if (!(flags & EVFLAG_NOENV)
1279 && !enable_secure ()
1280 && getenv ("LIBEV_FLAGS"))
1281 flags = atoi (getenv ("LIBEV_FLAGS"));
1282
1283 if (!(flags & 0x0000ffffU))
1284 flags |= ev_recommended_backends ();
1285
1286 #if EV_USE_PORT
1287 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1288 #endif
1289 #if EV_USE_KQUEUE
1290 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1291 #endif
1292 #if EV_USE_EPOLL
1293 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1294 #endif
1295 #if EV_USE_POLL
1296 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1297 #endif
1298 #if EV_USE_SELECT
1299 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1300 #endif
1301
1302 ev_init (&pipeev, pipecb);
1303 ev_set_priority (&pipeev, EV_MAXPRI);
1304 }
1305 }
1306
1307 static void noinline
1308 loop_destroy (EV_P)
1309 {
1310 int i;
1311
1312 if (ev_is_active (&pipeev))
1313 {
1314 ev_ref (EV_A); /* signal watcher */
1315 ev_io_stop (EV_A_ &pipeev);
1316
1317 #if EV_USE_EVENTFD
1318 if (evfd >= 0)
1319 close (evfd);
1320 #endif
1321
1322 if (evpipe [0] >= 0)
1323 {
1324 close (evpipe [0]);
1325 close (evpipe [1]);
1326 }
1327 }
1328
1329 #if EV_USE_INOTIFY
1330 if (fs_fd >= 0)
1331 close (fs_fd);
1332 #endif
1333
1334 if (backend_fd >= 0)
1335 close (backend_fd);
1336
1337 #if EV_USE_PORT
1338 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1339 #endif
1340 #if EV_USE_KQUEUE
1341 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1342 #endif
1343 #if EV_USE_EPOLL
1344 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1345 #endif
1346 #if EV_USE_POLL
1347 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1348 #endif
1349 #if EV_USE_SELECT
1350 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1351 #endif
1352
1353 for (i = NUMPRI; i--; )
1354 {
1355 array_free (pending, [i]);
1356 #if EV_IDLE_ENABLE
1357 array_free (idle, [i]);
1358 #endif
1359 }
1360
1361 ev_free (anfds); anfdmax = 0;
1362
1363 /* have to use the microsoft-never-gets-it-right macro */
1364 array_free (fdchange, EMPTY);
1365 array_free (timer, EMPTY);
1366 #if EV_PERIODIC_ENABLE
1367 array_free (periodic, EMPTY);
1368 #endif
1369 #if EV_FORK_ENABLE
1370 array_free (fork, EMPTY);
1371 #endif
1372 array_free (prepare, EMPTY);
1373 array_free (check, EMPTY);
1374 #if EV_ASYNC_ENABLE
1375 array_free (async, EMPTY);
1376 #endif
1377
1378 backend = 0;
1379 }
1380
1381 #if EV_USE_INOTIFY
1382 void inline_size infy_fork (EV_P);
1383 #endif
1384
1385 void inline_size
1386 loop_fork (EV_P)
1387 {
1388 #if EV_USE_PORT
1389 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1390 #endif
1391 #if EV_USE_KQUEUE
1392 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1393 #endif
1394 #if EV_USE_EPOLL
1395 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1396 #endif
1397 #if EV_USE_INOTIFY
1398 infy_fork (EV_A);
1399 #endif
1400
1401 if (ev_is_active (&pipeev))
1402 {
1403 /* this "locks" the handlers against writing to the pipe */
1404 /* while we modify the fd vars */
1405 gotsig = 1;
1406 #if EV_ASYNC_ENABLE
1407 gotasync = 1;
1408 #endif
1409
1410 ev_ref (EV_A);
1411 ev_io_stop (EV_A_ &pipeev);
1412
1413 #if EV_USE_EVENTFD
1414 if (evfd >= 0)
1415 close (evfd);
1416 #endif
1417
1418 if (evpipe [0] >= 0)
1419 {
1420 close (evpipe [0]);
1421 close (evpipe [1]);
1422 }
1423
1424 evpipe_init (EV_A);
1425 /* now iterate over everything, in case we missed something */
1426 pipecb (EV_A_ &pipeev, EV_READ);
1427 }
1428
1429 postfork = 0;
1430 }
1431
1432 #if EV_MULTIPLICITY
1433 struct ev_loop *
1434 ev_loop_new (unsigned int flags)
1435 {
1436 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1437
1438 memset (loop, 0, sizeof (struct ev_loop));
1439
1440 loop_init (EV_A_ flags);
1441
1442 if (ev_backend (EV_A))
1443 return loop;
1444
1445 return 0;
1446 }
1447
1448 void
1449 ev_loop_destroy (EV_P)
1450 {
1451 loop_destroy (EV_A);
1452 ev_free (loop);
1453 }
1454
1455 void
1456 ev_loop_fork (EV_P)
1457 {
1458 postfork = 1; /* must be in line with ev_default_fork */
1459 }
1460 #endif
1461
1462 #if EV_MULTIPLICITY
1463 struct ev_loop *
1464 ev_default_loop_init (unsigned int flags)
1465 #else
1466 int
1467 ev_default_loop (unsigned int flags)
1468 #endif
1469 {
1470 if (!ev_default_loop_ptr)
1471 {
1472 #if EV_MULTIPLICITY
1473 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1474 #else
1475 ev_default_loop_ptr = 1;
1476 #endif
1477
1478 loop_init (EV_A_ flags);
1479
1480 if (ev_backend (EV_A))
1481 {
1482 #ifndef _WIN32
1483 ev_signal_init (&childev, childcb, SIGCHLD);
1484 ev_set_priority (&childev, EV_MAXPRI);
1485 ev_signal_start (EV_A_ &childev);
1486 ev_unref (EV_A); /* child watcher should not keep loop alive */
1487 #endif
1488 }
1489 else
1490 ev_default_loop_ptr = 0;
1491 }
1492
1493 return ev_default_loop_ptr;
1494 }
1495
1496 void
1497 ev_default_destroy (void)
1498 {
1499 #if EV_MULTIPLICITY
1500 struct ev_loop *loop = ev_default_loop_ptr;
1501 #endif
1502
1503 #ifndef _WIN32
1504 ev_ref (EV_A); /* child watcher */
1505 ev_signal_stop (EV_A_ &childev);
1506 #endif
1507
1508 loop_destroy (EV_A);
1509 }
1510
1511 void
1512 ev_default_fork (void)
1513 {
1514 #if EV_MULTIPLICITY
1515 struct ev_loop *loop = ev_default_loop_ptr;
1516 #endif
1517
1518 if (backend)
1519 postfork = 1; /* must be in line with ev_loop_fork */
1520 }
1521
1522 /*****************************************************************************/
1523
1524 void
1525 ev_invoke (EV_P_ void *w, int revents)
1526 {
1527 EV_CB_INVOKE ((W)w, revents);
1528 }
1529
1530 void inline_speed
1531 call_pending (EV_P)
1532 {
1533 int pri;
1534
1535 for (pri = NUMPRI; pri--; )
1536 while (pendingcnt [pri])
1537 {
1538 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1539
1540 if (expect_true (p->w))
1541 {
1542 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1543
1544 p->w->pending = 0;
1545 EV_CB_INVOKE (p->w, p->events);
1546 }
1547 }
1548 }
1549
1550 #if EV_IDLE_ENABLE
1551 void inline_size
1552 idle_reify (EV_P)
1553 {
1554 if (expect_false (idleall))
1555 {
1556 int pri;
1557
1558 for (pri = NUMPRI; pri--; )
1559 {
1560 if (pendingcnt [pri])
1561 break;
1562
1563 if (idlecnt [pri])
1564 {
1565 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1566 break;
1567 }
1568 }
1569 }
1570 }
1571 #endif
1572
1573 void inline_size
1574 timers_reify (EV_P)
1575 {
1576 while (timercnt && ev_at (timers [HEAP0]) <= mn_now)
1577 {
1578 ev_timer *w = (ev_timer *)timers [HEAP0];
1579
1580 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1581
1582 /* first reschedule or stop timer */
1583 if (w->repeat)
1584 {
1585 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1586
1587 ev_at (w) += w->repeat;
1588 if (ev_at (w) < mn_now)
1589 ev_at (w) = mn_now;
1590
1591 downheap (timers, timercnt, HEAP0);
1592 }
1593 else
1594 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1595
1596 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1597 }
1598 }
1599
1600 #if EV_PERIODIC_ENABLE
1601 void inline_size
1602 periodics_reify (EV_P)
1603 {
1604 while (periodiccnt && ev_at (periodics [HEAP0]) <= ev_rt_now)
1605 {
1606 ev_periodic *w = (ev_periodic *)periodics [HEAP0];
1607
1608 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1609
1610 /* first reschedule or stop timer */
1611 if (w->reschedule_cb)
1612 {
1613 ev_at (w) = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1614 assert (("ev_periodic reschedule callback returned time in the past", ev_at (w) > ev_rt_now));
1615 downheap (periodics, periodiccnt, 1);
1616 }
1617 else if (w->interval)
1618 {
1619 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1620 if (ev_at (w) - ev_rt_now <= TIME_EPSILON) ev_at (w) += w->interval;
1621 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ev_at (w) > ev_rt_now));
1622 downheap (periodics, periodiccnt, HEAP0);
1623 }
1624 else
1625 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1626
1627 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1628 }
1629 }
1630
1631 static void noinline
1632 periodics_reschedule (EV_P)
1633 {
1634 int i;
1635
1636 /* adjust periodics after time jump */
1637 for (i = 1; i <= periodiccnt; ++i)
1638 {
1639 ev_periodic *w = (ev_periodic *)periodics [i];
1640
1641 if (w->reschedule_cb)
1642 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1643 else if (w->interval)
1644 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1645 }
1646
1647 /* now rebuild the heap */
1648 for (i = periodiccnt >> 1; --i; )
1649 downheap (periodics, periodiccnt, i + HEAP0);
1650 }
1651 #endif
1652
1653 void inline_speed
1654 time_update (EV_P_ ev_tstamp max_block)
1655 {
1656 int i;
1657
1658 #if EV_USE_MONOTONIC
1659 if (expect_true (have_monotonic))
1660 {
1661 ev_tstamp odiff = rtmn_diff;
1662
1663 mn_now = get_clock ();
1664
1665 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1666 /* interpolate in the meantime */
1667 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1668 {
1669 ev_rt_now = rtmn_diff + mn_now;
1670 return;
1671 }
1672
1673 now_floor = mn_now;
1674 ev_rt_now = ev_time ();
1675
1676 /* loop a few times, before making important decisions.
1677 * on the choice of "4": one iteration isn't enough,
1678 * in case we get preempted during the calls to
1679 * ev_time and get_clock. a second call is almost guaranteed
1680 * to succeed in that case, though. and looping a few more times
1681 * doesn't hurt either as we only do this on time-jumps or
1682 * in the unlikely event of having been preempted here.
1683 */
1684 for (i = 4; --i; )
1685 {
1686 rtmn_diff = ev_rt_now - mn_now;
1687
1688 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
1689 return; /* all is well */
1690
1691 ev_rt_now = ev_time ();
1692 mn_now = get_clock ();
1693 now_floor = mn_now;
1694 }
1695
1696 # if EV_PERIODIC_ENABLE
1697 periodics_reschedule (EV_A);
1698 # endif
1699 /* no timer adjustment, as the monotonic clock doesn't jump */
1700 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1701 }
1702 else
1703 #endif
1704 {
1705 ev_rt_now = ev_time ();
1706
1707 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1708 {
1709 #if EV_PERIODIC_ENABLE
1710 periodics_reschedule (EV_A);
1711 #endif
1712 /* adjust timers. this is easy, as the offset is the same for all of them */
1713 for (i = 1; i <= timercnt; ++i)
1714 ev_at (timers [i]) += ev_rt_now - mn_now;
1715 }
1716
1717 mn_now = ev_rt_now;
1718 }
1719 }
1720
1721 void
1722 ev_ref (EV_P)
1723 {
1724 ++activecnt;
1725 }
1726
1727 void
1728 ev_unref (EV_P)
1729 {
1730 --activecnt;
1731 }
1732
1733 static int loop_done;
1734
1735 void
1736 ev_loop (EV_P_ int flags)
1737 {
1738 loop_done = EVUNLOOP_CANCEL;
1739
1740 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1741
1742 do
1743 {
1744 #ifndef _WIN32
1745 if (expect_false (curpid)) /* penalise the forking check even more */
1746 if (expect_false (getpid () != curpid))
1747 {
1748 curpid = getpid ();
1749 postfork = 1;
1750 }
1751 #endif
1752
1753 #if EV_FORK_ENABLE
1754 /* we might have forked, so queue fork handlers */
1755 if (expect_false (postfork))
1756 if (forkcnt)
1757 {
1758 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1759 call_pending (EV_A);
1760 }
1761 #endif
1762
1763 /* queue prepare watchers (and execute them) */
1764 if (expect_false (preparecnt))
1765 {
1766 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1767 call_pending (EV_A);
1768 }
1769
1770 if (expect_false (!activecnt))
1771 break;
1772
1773 /* we might have forked, so reify kernel state if necessary */
1774 if (expect_false (postfork))
1775 loop_fork (EV_A);
1776
1777 /* update fd-related kernel structures */
1778 fd_reify (EV_A);
1779
1780 /* calculate blocking time */
1781 {
1782 ev_tstamp waittime = 0.;
1783 ev_tstamp sleeptime = 0.;
1784
1785 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1786 {
1787 /* update time to cancel out callback processing overhead */
1788 time_update (EV_A_ 1e100);
1789
1790 waittime = MAX_BLOCKTIME;
1791
1792 if (timercnt)
1793 {
1794 ev_tstamp to = ev_at (timers [HEAP0]) - mn_now + backend_fudge;
1795 if (waittime > to) waittime = to;
1796 }
1797
1798 #if EV_PERIODIC_ENABLE
1799 if (periodiccnt)
1800 {
1801 ev_tstamp to = ev_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
1802 if (waittime > to) waittime = to;
1803 }
1804 #endif
1805
1806 if (expect_false (waittime < timeout_blocktime))
1807 waittime = timeout_blocktime;
1808
1809 sleeptime = waittime - backend_fudge;
1810
1811 if (expect_true (sleeptime > io_blocktime))
1812 sleeptime = io_blocktime;
1813
1814 if (sleeptime)
1815 {
1816 ev_sleep (sleeptime);
1817 waittime -= sleeptime;
1818 }
1819 }
1820
1821 ++loop_count;
1822 backend_poll (EV_A_ waittime);
1823
1824 /* update ev_rt_now, do magic */
1825 time_update (EV_A_ waittime + sleeptime);
1826 }
1827
1828 /* queue pending timers and reschedule them */
1829 timers_reify (EV_A); /* relative timers called last */
1830 #if EV_PERIODIC_ENABLE
1831 periodics_reify (EV_A); /* absolute timers called first */
1832 #endif
1833
1834 #if EV_IDLE_ENABLE
1835 /* queue idle watchers unless other events are pending */
1836 idle_reify (EV_A);
1837 #endif
1838
1839 /* queue check watchers, to be executed first */
1840 if (expect_false (checkcnt))
1841 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1842
1843 call_pending (EV_A);
1844 }
1845 while (expect_true (
1846 activecnt
1847 && !loop_done
1848 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
1849 ));
1850
1851 if (loop_done == EVUNLOOP_ONE)
1852 loop_done = EVUNLOOP_CANCEL;
1853 }
1854
1855 void
1856 ev_unloop (EV_P_ int how)
1857 {
1858 loop_done = how;
1859 }
1860
1861 /*****************************************************************************/
1862
1863 void inline_size
1864 wlist_add (WL *head, WL elem)
1865 {
1866 elem->next = *head;
1867 *head = elem;
1868 }
1869
1870 void inline_size
1871 wlist_del (WL *head, WL elem)
1872 {
1873 while (*head)
1874 {
1875 if (*head == elem)
1876 {
1877 *head = elem->next;
1878 return;
1879 }
1880
1881 head = &(*head)->next;
1882 }
1883 }
1884
1885 void inline_speed
1886 clear_pending (EV_P_ W w)
1887 {
1888 if (w->pending)
1889 {
1890 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1891 w->pending = 0;
1892 }
1893 }
1894
1895 int
1896 ev_clear_pending (EV_P_ void *w)
1897 {
1898 W w_ = (W)w;
1899 int pending = w_->pending;
1900
1901 if (expect_true (pending))
1902 {
1903 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1904 w_->pending = 0;
1905 p->w = 0;
1906 return p->events;
1907 }
1908 else
1909 return 0;
1910 }
1911
1912 void inline_size
1913 pri_adjust (EV_P_ W w)
1914 {
1915 int pri = w->priority;
1916 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1917 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1918 w->priority = pri;
1919 }
1920
1921 void inline_speed
1922 ev_start (EV_P_ W w, int active)
1923 {
1924 pri_adjust (EV_A_ w);
1925 w->active = active;
1926 ev_ref (EV_A);
1927 }
1928
1929 void inline_size
1930 ev_stop (EV_P_ W w)
1931 {
1932 ev_unref (EV_A);
1933 w->active = 0;
1934 }
1935
1936 /*****************************************************************************/
1937
1938 void noinline
1939 ev_io_start (EV_P_ ev_io *w)
1940 {
1941 int fd = w->fd;
1942
1943 if (expect_false (ev_is_active (w)))
1944 return;
1945
1946 assert (("ev_io_start called with negative fd", fd >= 0));
1947
1948 ev_start (EV_A_ (W)w, 1);
1949 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1950 wlist_add (&anfds[fd].head, (WL)w);
1951
1952 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1953 w->events &= ~EV_IOFDSET;
1954 }
1955
1956 void noinline
1957 ev_io_stop (EV_P_ ev_io *w)
1958 {
1959 clear_pending (EV_A_ (W)w);
1960 if (expect_false (!ev_is_active (w)))
1961 return;
1962
1963 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1964
1965 wlist_del (&anfds[w->fd].head, (WL)w);
1966 ev_stop (EV_A_ (W)w);
1967
1968 fd_change (EV_A_ w->fd, 1);
1969 }
1970
1971 void noinline
1972 ev_timer_start (EV_P_ ev_timer *w)
1973 {
1974 if (expect_false (ev_is_active (w)))
1975 return;
1976
1977 ev_at (w) += mn_now;
1978
1979 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1980
1981 ev_start (EV_A_ (W)w, ++timercnt + HEAP0 - 1);
1982 array_needsize (WT, timers, timermax, timercnt + HEAP0, EMPTY2);
1983 timers [ev_active (w)] = (WT)w;
1984 upheap (timers, ev_active (w));
1985
1986 /*assert (("internal timer heap corruption", timers [ev_active (w)] == w));*/
1987 }
1988
1989 void noinline
1990 ev_timer_stop (EV_P_ ev_timer *w)
1991 {
1992 clear_pending (EV_A_ (W)w);
1993 if (expect_false (!ev_is_active (w)))
1994 return;
1995
1996 {
1997 int active = ev_active (w);
1998
1999 assert (("internal timer heap corruption", timers [active] == (WT)w));
2000
2001 if (expect_true (active < timercnt + HEAP0 - 1))
2002 {
2003 timers [active] = timers [timercnt + HEAP0 - 1];
2004 adjustheap (timers, timercnt, active);
2005 }
2006
2007 --timercnt;
2008 }
2009
2010 ev_at (w) -= mn_now;
2011
2012 ev_stop (EV_A_ (W)w);
2013 }
2014
2015 void noinline
2016 ev_timer_again (EV_P_ ev_timer *w)
2017 {
2018 if (ev_is_active (w))
2019 {
2020 if (w->repeat)
2021 {
2022 ev_at (w) = mn_now + w->repeat;
2023 adjustheap (timers, timercnt, ev_active (w));
2024 }
2025 else
2026 ev_timer_stop (EV_A_ w);
2027 }
2028 else if (w->repeat)
2029 {
2030 ev_at (w) = w->repeat;
2031 ev_timer_start (EV_A_ w);
2032 }
2033 }
2034
2035 #if EV_PERIODIC_ENABLE
2036 void noinline
2037 ev_periodic_start (EV_P_ ev_periodic *w)
2038 {
2039 if (expect_false (ev_is_active (w)))
2040 return;
2041
2042 if (w->reschedule_cb)
2043 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2044 else if (w->interval)
2045 {
2046 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
2047 /* this formula differs from the one in periodic_reify because we do not always round up */
2048 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2049 }
2050 else
2051 ev_at (w) = w->offset;
2052
2053 ev_start (EV_A_ (W)w, ++periodiccnt + HEAP0 - 1);
2054 array_needsize (WT, periodics, periodicmax, periodiccnt + HEAP0, EMPTY2);
2055 periodics [ev_active (w)] = (WT)w;
2056 upheap (periodics, ev_active (w));
2057
2058 /*assert (("internal periodic heap corruption", periodics [ev_active (w)] == w));*/
2059 }
2060
2061 void noinline
2062 ev_periodic_stop (EV_P_ ev_periodic *w)
2063 {
2064 clear_pending (EV_A_ (W)w);
2065 if (expect_false (!ev_is_active (w)))
2066 return;
2067
2068 {
2069 int active = ev_active (w);
2070
2071 assert (("internal periodic heap corruption", periodics [active] == (WT)w));
2072
2073 if (expect_true (active < periodiccnt + HEAP0 - 1))
2074 {
2075 periodics [active] = periodics [periodiccnt + HEAP0 - 1];
2076 adjustheap (periodics, periodiccnt, active);
2077 }
2078
2079 --periodiccnt;
2080 }
2081
2082 ev_stop (EV_A_ (W)w);
2083 }
2084
2085 void noinline
2086 ev_periodic_again (EV_P_ ev_periodic *w)
2087 {
2088 /* TODO: use adjustheap and recalculation */
2089 ev_periodic_stop (EV_A_ w);
2090 ev_periodic_start (EV_A_ w);
2091 }
2092 #endif
2093
2094 #ifndef SA_RESTART
2095 # define SA_RESTART 0
2096 #endif
2097
2098 void noinline
2099 ev_signal_start (EV_P_ ev_signal *w)
2100 {
2101 #if EV_MULTIPLICITY
2102 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2103 #endif
2104 if (expect_false (ev_is_active (w)))
2105 return;
2106
2107 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2108
2109 evpipe_init (EV_A);
2110
2111 {
2112 #ifndef _WIN32
2113 sigset_t full, prev;
2114 sigfillset (&full);
2115 sigprocmask (SIG_SETMASK, &full, &prev);
2116 #endif
2117
2118 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2119
2120 #ifndef _WIN32
2121 sigprocmask (SIG_SETMASK, &prev, 0);
2122 #endif
2123 }
2124
2125 ev_start (EV_A_ (W)w, 1);
2126 wlist_add (&signals [w->signum - 1].head, (WL)w);
2127
2128 if (!((WL)w)->next)
2129 {
2130 #if _WIN32
2131 signal (w->signum, ev_sighandler);
2132 #else
2133 struct sigaction sa;
2134 sa.sa_handler = ev_sighandler;
2135 sigfillset (&sa.sa_mask);
2136 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2137 sigaction (w->signum, &sa, 0);
2138 #endif
2139 }
2140 }
2141
2142 void noinline
2143 ev_signal_stop (EV_P_ ev_signal *w)
2144 {
2145 clear_pending (EV_A_ (W)w);
2146 if (expect_false (!ev_is_active (w)))
2147 return;
2148
2149 wlist_del (&signals [w->signum - 1].head, (WL)w);
2150 ev_stop (EV_A_ (W)w);
2151
2152 if (!signals [w->signum - 1].head)
2153 signal (w->signum, SIG_DFL);
2154 }
2155
2156 void
2157 ev_child_start (EV_P_ ev_child *w)
2158 {
2159 #if EV_MULTIPLICITY
2160 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2161 #endif
2162 if (expect_false (ev_is_active (w)))
2163 return;
2164
2165 ev_start (EV_A_ (W)w, 1);
2166 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2167 }
2168
2169 void
2170 ev_child_stop (EV_P_ ev_child *w)
2171 {
2172 clear_pending (EV_A_ (W)w);
2173 if (expect_false (!ev_is_active (w)))
2174 return;
2175
2176 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2177 ev_stop (EV_A_ (W)w);
2178 }
2179
2180 #if EV_STAT_ENABLE
2181
2182 # ifdef _WIN32
2183 # undef lstat
2184 # define lstat(a,b) _stati64 (a,b)
2185 # endif
2186
2187 #define DEF_STAT_INTERVAL 5.0074891
2188 #define MIN_STAT_INTERVAL 0.1074891
2189
2190 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2191
2192 #if EV_USE_INOTIFY
2193 # define EV_INOTIFY_BUFSIZE 8192
2194
2195 static void noinline
2196 infy_add (EV_P_ ev_stat *w)
2197 {
2198 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);
2199
2200 if (w->wd < 0)
2201 {
2202 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2203
2204 /* monitor some parent directory for speedup hints */
2205 /* note that exceeding the hardcoded limit is not a correctness issue, */
2206 /* but an efficiency issue only */
2207 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2208 {
2209 char path [4096];
2210 strcpy (path, w->path);
2211
2212 do
2213 {
2214 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2215 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2216
2217 char *pend = strrchr (path, '/');
2218
2219 if (!pend)
2220 break; /* whoops, no '/', complain to your admin */
2221
2222 *pend = 0;
2223 w->wd = inotify_add_watch (fs_fd, path, mask);
2224 }
2225 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2226 }
2227 }
2228 else
2229 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2230
2231 if (w->wd >= 0)
2232 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2233 }
2234
2235 static void noinline
2236 infy_del (EV_P_ ev_stat *w)
2237 {
2238 int slot;
2239 int wd = w->wd;
2240
2241 if (wd < 0)
2242 return;
2243
2244 w->wd = -2;
2245 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2246 wlist_del (&fs_hash [slot].head, (WL)w);
2247
2248 /* remove this watcher, if others are watching it, they will rearm */
2249 inotify_rm_watch (fs_fd, wd);
2250 }
2251
2252 static void noinline
2253 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2254 {
2255 if (slot < 0)
2256 /* overflow, need to check for all hahs slots */
2257 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2258 infy_wd (EV_A_ slot, wd, ev);
2259 else
2260 {
2261 WL w_;
2262
2263 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2264 {
2265 ev_stat *w = (ev_stat *)w_;
2266 w_ = w_->next; /* lets us remove this watcher and all before it */
2267
2268 if (w->wd == wd || wd == -1)
2269 {
2270 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2271 {
2272 w->wd = -1;
2273 infy_add (EV_A_ w); /* re-add, no matter what */
2274 }
2275
2276 stat_timer_cb (EV_A_ &w->timer, 0);
2277 }
2278 }
2279 }
2280 }
2281
2282 static void
2283 infy_cb (EV_P_ ev_io *w, int revents)
2284 {
2285 char buf [EV_INOTIFY_BUFSIZE];
2286 struct inotify_event *ev = (struct inotify_event *)buf;
2287 int ofs;
2288 int len = read (fs_fd, buf, sizeof (buf));
2289
2290 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2291 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2292 }
2293
2294 void inline_size
2295 infy_init (EV_P)
2296 {
2297 if (fs_fd != -2)
2298 return;
2299
2300 fs_fd = inotify_init ();
2301
2302 if (fs_fd >= 0)
2303 {
2304 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2305 ev_set_priority (&fs_w, EV_MAXPRI);
2306 ev_io_start (EV_A_ &fs_w);
2307 }
2308 }
2309
2310 void inline_size
2311 infy_fork (EV_P)
2312 {
2313 int slot;
2314
2315 if (fs_fd < 0)
2316 return;
2317
2318 close (fs_fd);
2319 fs_fd = inotify_init ();
2320
2321 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2322 {
2323 WL w_ = fs_hash [slot].head;
2324 fs_hash [slot].head = 0;
2325
2326 while (w_)
2327 {
2328 ev_stat *w = (ev_stat *)w_;
2329 w_ = w_->next; /* lets us add this watcher */
2330
2331 w->wd = -1;
2332
2333 if (fs_fd >= 0)
2334 infy_add (EV_A_ w); /* re-add, no matter what */
2335 else
2336 ev_timer_start (EV_A_ &w->timer);
2337 }
2338
2339 }
2340 }
2341
2342 #endif
2343
2344 void
2345 ev_stat_stat (EV_P_ ev_stat *w)
2346 {
2347 if (lstat (w->path, &w->attr) < 0)
2348 w->attr.st_nlink = 0;
2349 else if (!w->attr.st_nlink)
2350 w->attr.st_nlink = 1;
2351 }
2352
2353 static void noinline
2354 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2355 {
2356 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2357
2358 /* we copy this here each the time so that */
2359 /* prev has the old value when the callback gets invoked */
2360 w->prev = w->attr;
2361 ev_stat_stat (EV_A_ w);
2362
2363 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2364 if (
2365 w->prev.st_dev != w->attr.st_dev
2366 || w->prev.st_ino != w->attr.st_ino
2367 || w->prev.st_mode != w->attr.st_mode
2368 || w->prev.st_nlink != w->attr.st_nlink
2369 || w->prev.st_uid != w->attr.st_uid
2370 || w->prev.st_gid != w->attr.st_gid
2371 || w->prev.st_rdev != w->attr.st_rdev
2372 || w->prev.st_size != w->attr.st_size
2373 || w->prev.st_atime != w->attr.st_atime
2374 || w->prev.st_mtime != w->attr.st_mtime
2375 || w->prev.st_ctime != w->attr.st_ctime
2376 ) {
2377 #if EV_USE_INOTIFY
2378 infy_del (EV_A_ w);
2379 infy_add (EV_A_ w);
2380 ev_stat_stat (EV_A_ w); /* avoid race... */
2381 #endif
2382
2383 ev_feed_event (EV_A_ w, EV_STAT);
2384 }
2385 }
2386
2387 void
2388 ev_stat_start (EV_P_ ev_stat *w)
2389 {
2390 if (expect_false (ev_is_active (w)))
2391 return;
2392
2393 /* since we use memcmp, we need to clear any padding data etc. */
2394 memset (&w->prev, 0, sizeof (ev_statdata));
2395 memset (&w->attr, 0, sizeof (ev_statdata));
2396
2397 ev_stat_stat (EV_A_ w);
2398
2399 if (w->interval < MIN_STAT_INTERVAL)
2400 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2401
2402 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2403 ev_set_priority (&w->timer, ev_priority (w));
2404
2405 #if EV_USE_INOTIFY
2406 infy_init (EV_A);
2407
2408 if (fs_fd >= 0)
2409 infy_add (EV_A_ w);
2410 else
2411 #endif
2412 ev_timer_start (EV_A_ &w->timer);
2413
2414 ev_start (EV_A_ (W)w, 1);
2415 }
2416
2417 void
2418 ev_stat_stop (EV_P_ ev_stat *w)
2419 {
2420 clear_pending (EV_A_ (W)w);
2421 if (expect_false (!ev_is_active (w)))
2422 return;
2423
2424 #if EV_USE_INOTIFY
2425 infy_del (EV_A_ w);
2426 #endif
2427 ev_timer_stop (EV_A_ &w->timer);
2428
2429 ev_stop (EV_A_ (W)w);
2430 }
2431 #endif
2432
2433 #if EV_IDLE_ENABLE
2434 void
2435 ev_idle_start (EV_P_ ev_idle *w)
2436 {
2437 if (expect_false (ev_is_active (w)))
2438 return;
2439
2440 pri_adjust (EV_A_ (W)w);
2441
2442 {
2443 int active = ++idlecnt [ABSPRI (w)];
2444
2445 ++idleall;
2446 ev_start (EV_A_ (W)w, active);
2447
2448 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2449 idles [ABSPRI (w)][active - 1] = w;
2450 }
2451 }
2452
2453 void
2454 ev_idle_stop (EV_P_ ev_idle *w)
2455 {
2456 clear_pending (EV_A_ (W)w);
2457 if (expect_false (!ev_is_active (w)))
2458 return;
2459
2460 {
2461 int active = ev_active (w);
2462
2463 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2464 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2465
2466 ev_stop (EV_A_ (W)w);
2467 --idleall;
2468 }
2469 }
2470 #endif
2471
2472 void
2473 ev_prepare_start (EV_P_ ev_prepare *w)
2474 {
2475 if (expect_false (ev_is_active (w)))
2476 return;
2477
2478 ev_start (EV_A_ (W)w, ++preparecnt);
2479 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2480 prepares [preparecnt - 1] = w;
2481 }
2482
2483 void
2484 ev_prepare_stop (EV_P_ ev_prepare *w)
2485 {
2486 clear_pending (EV_A_ (W)w);
2487 if (expect_false (!ev_is_active (w)))
2488 return;
2489
2490 {
2491 int active = ev_active (w);
2492
2493 prepares [active - 1] = prepares [--preparecnt];
2494 ev_active (prepares [active - 1]) = active;
2495 }
2496
2497 ev_stop (EV_A_ (W)w);
2498 }
2499
2500 void
2501 ev_check_start (EV_P_ ev_check *w)
2502 {
2503 if (expect_false (ev_is_active (w)))
2504 return;
2505
2506 ev_start (EV_A_ (W)w, ++checkcnt);
2507 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2508 checks [checkcnt - 1] = w;
2509 }
2510
2511 void
2512 ev_check_stop (EV_P_ ev_check *w)
2513 {
2514 clear_pending (EV_A_ (W)w);
2515 if (expect_false (!ev_is_active (w)))
2516 return;
2517
2518 {
2519 int active = ev_active (w);
2520
2521 checks [active - 1] = checks [--checkcnt];
2522 ev_active (checks [active - 1]) = active;
2523 }
2524
2525 ev_stop (EV_A_ (W)w);
2526 }
2527
2528 #if EV_EMBED_ENABLE
2529 void noinline
2530 ev_embed_sweep (EV_P_ ev_embed *w)
2531 {
2532 ev_loop (w->other, EVLOOP_NONBLOCK);
2533 }
2534
2535 static void
2536 embed_io_cb (EV_P_ ev_io *io, int revents)
2537 {
2538 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2539
2540 if (ev_cb (w))
2541 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2542 else
2543 ev_loop (w->other, EVLOOP_NONBLOCK);
2544 }
2545
2546 static void
2547 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2548 {
2549 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2550
2551 {
2552 struct ev_loop *loop = w->other;
2553
2554 while (fdchangecnt)
2555 {
2556 fd_reify (EV_A);
2557 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2558 }
2559 }
2560 }
2561
2562 #if 0
2563 static void
2564 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2565 {
2566 ev_idle_stop (EV_A_ idle);
2567 }
2568 #endif
2569
2570 void
2571 ev_embed_start (EV_P_ ev_embed *w)
2572 {
2573 if (expect_false (ev_is_active (w)))
2574 return;
2575
2576 {
2577 struct ev_loop *loop = w->other;
2578 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2579 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2580 }
2581
2582 ev_set_priority (&w->io, ev_priority (w));
2583 ev_io_start (EV_A_ &w->io);
2584
2585 ev_prepare_init (&w->prepare, embed_prepare_cb);
2586 ev_set_priority (&w->prepare, EV_MINPRI);
2587 ev_prepare_start (EV_A_ &w->prepare);
2588
2589 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2590
2591 ev_start (EV_A_ (W)w, 1);
2592 }
2593
2594 void
2595 ev_embed_stop (EV_P_ ev_embed *w)
2596 {
2597 clear_pending (EV_A_ (W)w);
2598 if (expect_false (!ev_is_active (w)))
2599 return;
2600
2601 ev_io_stop (EV_A_ &w->io);
2602 ev_prepare_stop (EV_A_ &w->prepare);
2603
2604 ev_stop (EV_A_ (W)w);
2605 }
2606 #endif
2607
2608 #if EV_FORK_ENABLE
2609 void
2610 ev_fork_start (EV_P_ ev_fork *w)
2611 {
2612 if (expect_false (ev_is_active (w)))
2613 return;
2614
2615 ev_start (EV_A_ (W)w, ++forkcnt);
2616 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2617 forks [forkcnt - 1] = w;
2618 }
2619
2620 void
2621 ev_fork_stop (EV_P_ ev_fork *w)
2622 {
2623 clear_pending (EV_A_ (W)w);
2624 if (expect_false (!ev_is_active (w)))
2625 return;
2626
2627 {
2628 int active = ev_active (w);
2629
2630 forks [active - 1] = forks [--forkcnt];
2631 ev_active (forks [active - 1]) = active;
2632 }
2633
2634 ev_stop (EV_A_ (W)w);
2635 }
2636 #endif
2637
2638 #if EV_ASYNC_ENABLE
2639 void
2640 ev_async_start (EV_P_ ev_async *w)
2641 {
2642 if (expect_false (ev_is_active (w)))
2643 return;
2644
2645 evpipe_init (EV_A);
2646
2647 ev_start (EV_A_ (W)w, ++asynccnt);
2648 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2649 asyncs [asynccnt - 1] = w;
2650 }
2651
2652 void
2653 ev_async_stop (EV_P_ ev_async *w)
2654 {
2655 clear_pending (EV_A_ (W)w);
2656 if (expect_false (!ev_is_active (w)))
2657 return;
2658
2659 {
2660 int active = ev_active (w);
2661
2662 asyncs [active - 1] = asyncs [--asynccnt];
2663 ev_active (asyncs [active - 1]) = active;
2664 }
2665
2666 ev_stop (EV_A_ (W)w);
2667 }
2668
2669 void
2670 ev_async_send (EV_P_ ev_async *w)
2671 {
2672 w->sent = 1;
2673 evpipe_write (EV_A_ &gotasync);
2674 }
2675 #endif
2676
2677 /*****************************************************************************/
2678
2679 struct ev_once
2680 {
2681 ev_io io;
2682 ev_timer to;
2683 void (*cb)(int revents, void *arg);
2684 void *arg;
2685 };
2686
2687 static void
2688 once_cb (EV_P_ struct ev_once *once, int revents)
2689 {
2690 void (*cb)(int revents, void *arg) = once->cb;
2691 void *arg = once->arg;
2692
2693 ev_io_stop (EV_A_ &once->io);
2694 ev_timer_stop (EV_A_ &once->to);
2695 ev_free (once);
2696
2697 cb (revents, arg);
2698 }
2699
2700 static void
2701 once_cb_io (EV_P_ ev_io *w, int revents)
2702 {
2703 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2704 }
2705
2706 static void
2707 once_cb_to (EV_P_ ev_timer *w, int revents)
2708 {
2709 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2710 }
2711
2712 void
2713 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2714 {
2715 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2716
2717 if (expect_false (!once))
2718 {
2719 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2720 return;
2721 }
2722
2723 once->cb = cb;
2724 once->arg = arg;
2725
2726 ev_init (&once->io, once_cb_io);
2727 if (fd >= 0)
2728 {
2729 ev_io_set (&once->io, fd, events);
2730 ev_io_start (EV_A_ &once->io);
2731 }
2732
2733 ev_init (&once->to, once_cb_to);
2734 if (timeout >= 0.)
2735 {
2736 ev_timer_set (&once->to, timeout, 0.);
2737 ev_timer_start (EV_A_ &once->to);
2738 }
2739 }
2740
2741 #if EV_MULTIPLICITY
2742 #include "ev_wrap.h"
2743 #endif
2744
2745 #ifdef __cplusplus
2746 }
2747 #endif
2748