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Revision: 1.249
Committed: Wed May 21 23:30:52 2008 UTC (16 years, 2 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.248: +12 -6 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 #if 0 /* debugging */
241 # define EV_VERIFY 1
242 # define EV_USE_4HEAP 1
243 # define EV_HEAP_CACHE_AT 1
244 #endif
245
246 #ifndef EV_USE_4HEAP
247 # define EV_USE_4HEAP !EV_MINIMAL
248 #endif
249
250 #ifndef EV_HEAP_CACHE_AT
251 # define EV_HEAP_CACHE_AT !EV_MINIMAL
252 #endif
253
254 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
255
256 #ifndef CLOCK_MONOTONIC
257 # undef EV_USE_MONOTONIC
258 # define EV_USE_MONOTONIC 0
259 #endif
260
261 #ifndef CLOCK_REALTIME
262 # undef EV_USE_REALTIME
263 # define EV_USE_REALTIME 0
264 #endif
265
266 #if !EV_STAT_ENABLE
267 # undef EV_USE_INOTIFY
268 # define EV_USE_INOTIFY 0
269 #endif
270
271 #if !EV_USE_NANOSLEEP
272 # ifndef _WIN32
273 # include <sys/select.h>
274 # endif
275 #endif
276
277 #if EV_USE_INOTIFY
278 # include <sys/inotify.h>
279 #endif
280
281 #if EV_SELECT_IS_WINSOCKET
282 # include <winsock.h>
283 #endif
284
285 #if EV_USE_EVENTFD
286 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
287 # include <stdint.h>
288 # ifdef __cplusplus
289 extern "C" {
290 # endif
291 int eventfd (unsigned int initval, int flags);
292 # ifdef __cplusplus
293 }
294 # endif
295 #endif
296
297 /**/
298
299 /* EV_VERIFY: enable internal consistency checks
300 * undefined or zero: no verification done or available
301 * 1 or higher: ev_loop_verify function available
302 * 2 or higher: ev_loop_verify is called frequently
303 */
304 #if EV_VERIFY >= 1
305 # define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
306 #else
307 # define EV_FREQUENT_CHECK do { } while (0)
308 #endif
309
310 /*
311 * This is used to avoid floating point rounding problems.
312 * It is added to ev_rt_now when scheduling periodics
313 * to ensure progress, time-wise, even when rounding
314 * errors are against us.
315 * This value is good at least till the year 4000.
316 * Better solutions welcome.
317 */
318 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
319
320 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
321 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
322 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
323
324 #if __GNUC__ >= 4
325 # define expect(expr,value) __builtin_expect ((expr),(value))
326 # define noinline __attribute__ ((noinline))
327 #else
328 # define expect(expr,value) (expr)
329 # define noinline
330 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
331 # define inline
332 # endif
333 #endif
334
335 #define expect_false(expr) expect ((expr) != 0, 0)
336 #define expect_true(expr) expect ((expr) != 0, 1)
337 #define inline_size static inline
338
339 #if EV_MINIMAL
340 # define inline_speed static noinline
341 #else
342 # define inline_speed static inline
343 #endif
344
345 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
346 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
347
348 #define EMPTY /* required for microsofts broken pseudo-c compiler */
349 #define EMPTY2(a,b) /* used to suppress some warnings */
350
351 typedef ev_watcher *W;
352 typedef ev_watcher_list *WL;
353 typedef ev_watcher_time *WT;
354
355 #define ev_active(w) ((W)(w))->active
356 #define ev_at(w) ((WT)(w))->at
357
358 #if EV_USE_MONOTONIC
359 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
360 /* giving it a reasonably high chance of working on typical architetcures */
361 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
362 #endif
363
364 #ifdef _WIN32
365 # include "ev_win32.c"
366 #endif
367
368 /*****************************************************************************/
369
370 static void (*syserr_cb)(const char *msg);
371
372 void
373 ev_set_syserr_cb (void (*cb)(const char *msg))
374 {
375 syserr_cb = cb;
376 }
377
378 static void noinline
379 syserr (const char *msg)
380 {
381 if (!msg)
382 msg = "(libev) system error";
383
384 if (syserr_cb)
385 syserr_cb (msg);
386 else
387 {
388 perror (msg);
389 abort ();
390 }
391 }
392
393 static void *
394 ev_realloc_emul (void *ptr, long size)
395 {
396 /* some systems, notably openbsd and darwin, fail to properly
397 * implement realloc (x, 0) (as required by both ansi c-98 and
398 * the single unix specification, so work around them here.
399 */
400
401 if (size)
402 return realloc (ptr, size);
403
404 free (ptr);
405 return 0;
406 }
407
408 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
409
410 void
411 ev_set_allocator (void *(*cb)(void *ptr, long size))
412 {
413 alloc = cb;
414 }
415
416 inline_speed void *
417 ev_realloc (void *ptr, long size)
418 {
419 ptr = alloc (ptr, size);
420
421 if (!ptr && size)
422 {
423 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
424 abort ();
425 }
426
427 return ptr;
428 }
429
430 #define ev_malloc(size) ev_realloc (0, (size))
431 #define ev_free(ptr) ev_realloc ((ptr), 0)
432
433 /*****************************************************************************/
434
435 typedef struct
436 {
437 WL head;
438 unsigned char events;
439 unsigned char reify;
440 #if EV_SELECT_IS_WINSOCKET
441 SOCKET handle;
442 #endif
443 } ANFD;
444
445 typedef struct
446 {
447 W w;
448 int events;
449 } ANPENDING;
450
451 #if EV_USE_INOTIFY
452 /* hash table entry per inotify-id */
453 typedef struct
454 {
455 WL head;
456 } ANFS;
457 #endif
458
459 /* Heap Entry */
460 #if EV_HEAP_CACHE_AT
461 typedef struct {
462 ev_tstamp at;
463 WT w;
464 } ANHE;
465
466 #define ANHE_w(he) (he).w /* access watcher, read-write */
467 #define ANHE_at(he) (he).at /* access cached at, read-only */
468 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
469 #else
470 typedef WT ANHE;
471
472 #define ANHE_w(he) (he)
473 #define ANHE_at(he) (he)->at
474 #define ANHE_at_cache(he)
475 #endif
476
477 #if EV_MULTIPLICITY
478
479 struct ev_loop
480 {
481 ev_tstamp ev_rt_now;
482 #define ev_rt_now ((loop)->ev_rt_now)
483 #define VAR(name,decl) decl;
484 #include "ev_vars.h"
485 #undef VAR
486 };
487 #include "ev_wrap.h"
488
489 static struct ev_loop default_loop_struct;
490 struct ev_loop *ev_default_loop_ptr;
491
492 #else
493
494 ev_tstamp ev_rt_now;
495 #define VAR(name,decl) static decl;
496 #include "ev_vars.h"
497 #undef VAR
498
499 static int ev_default_loop_ptr;
500
501 #endif
502
503 /*****************************************************************************/
504
505 ev_tstamp
506 ev_time (void)
507 {
508 #if EV_USE_REALTIME
509 struct timespec ts;
510 clock_gettime (CLOCK_REALTIME, &ts);
511 return ts.tv_sec + ts.tv_nsec * 1e-9;
512 #else
513 struct timeval tv;
514 gettimeofday (&tv, 0);
515 return tv.tv_sec + tv.tv_usec * 1e-6;
516 #endif
517 }
518
519 ev_tstamp inline_size
520 get_clock (void)
521 {
522 #if EV_USE_MONOTONIC
523 if (expect_true (have_monotonic))
524 {
525 struct timespec ts;
526 clock_gettime (CLOCK_MONOTONIC, &ts);
527 return ts.tv_sec + ts.tv_nsec * 1e-9;
528 }
529 #endif
530
531 return ev_time ();
532 }
533
534 #if EV_MULTIPLICITY
535 ev_tstamp
536 ev_now (EV_P)
537 {
538 return ev_rt_now;
539 }
540 #endif
541
542 void
543 ev_sleep (ev_tstamp delay)
544 {
545 if (delay > 0.)
546 {
547 #if EV_USE_NANOSLEEP
548 struct timespec ts;
549
550 ts.tv_sec = (time_t)delay;
551 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
552
553 nanosleep (&ts, 0);
554 #elif defined(_WIN32)
555 Sleep ((unsigned long)(delay * 1e3));
556 #else
557 struct timeval tv;
558
559 tv.tv_sec = (time_t)delay;
560 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
561
562 select (0, 0, 0, 0, &tv);
563 #endif
564 }
565 }
566
567 /*****************************************************************************/
568
569 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
570
571 int inline_size
572 array_nextsize (int elem, int cur, int cnt)
573 {
574 int ncur = cur + 1;
575
576 do
577 ncur <<= 1;
578 while (cnt > ncur);
579
580 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
581 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
582 {
583 ncur *= elem;
584 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
585 ncur = ncur - sizeof (void *) * 4;
586 ncur /= elem;
587 }
588
589 return ncur;
590 }
591
592 static noinline void *
593 array_realloc (int elem, void *base, int *cur, int cnt)
594 {
595 *cur = array_nextsize (elem, *cur, cnt);
596 return ev_realloc (base, elem * *cur);
597 }
598
599 #define array_needsize(type,base,cur,cnt,init) \
600 if (expect_false ((cnt) > (cur))) \
601 { \
602 int ocur_ = (cur); \
603 (base) = (type *)array_realloc \
604 (sizeof (type), (base), &(cur), (cnt)); \
605 init ((base) + (ocur_), (cur) - ocur_); \
606 }
607
608 #if 0
609 #define array_slim(type,stem) \
610 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
611 { \
612 stem ## max = array_roundsize (stem ## cnt >> 1); \
613 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
614 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
615 }
616 #endif
617
618 #define array_free(stem, idx) \
619 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
620
621 /*****************************************************************************/
622
623 void noinline
624 ev_feed_event (EV_P_ void *w, int revents)
625 {
626 W w_ = (W)w;
627 int pri = ABSPRI (w_);
628
629 if (expect_false (w_->pending))
630 pendings [pri][w_->pending - 1].events |= revents;
631 else
632 {
633 w_->pending = ++pendingcnt [pri];
634 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
635 pendings [pri][w_->pending - 1].w = w_;
636 pendings [pri][w_->pending - 1].events = revents;
637 }
638 }
639
640 void inline_speed
641 queue_events (EV_P_ W *events, int eventcnt, int type)
642 {
643 int i;
644
645 for (i = 0; i < eventcnt; ++i)
646 ev_feed_event (EV_A_ events [i], type);
647 }
648
649 /*****************************************************************************/
650
651 void inline_size
652 anfds_init (ANFD *base, int count)
653 {
654 while (count--)
655 {
656 base->head = 0;
657 base->events = EV_NONE;
658 base->reify = 0;
659
660 ++base;
661 }
662 }
663
664 void inline_speed
665 fd_event (EV_P_ int fd, int revents)
666 {
667 ANFD *anfd = anfds + fd;
668 ev_io *w;
669
670 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
671 {
672 int ev = w->events & revents;
673
674 if (ev)
675 ev_feed_event (EV_A_ (W)w, ev);
676 }
677 }
678
679 void
680 ev_feed_fd_event (EV_P_ int fd, int revents)
681 {
682 if (fd >= 0 && fd < anfdmax)
683 fd_event (EV_A_ fd, revents);
684 }
685
686 void inline_size
687 fd_reify (EV_P)
688 {
689 int i;
690
691 for (i = 0; i < fdchangecnt; ++i)
692 {
693 int fd = fdchanges [i];
694 ANFD *anfd = anfds + fd;
695 ev_io *w;
696
697 unsigned char events = 0;
698
699 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
700 events |= (unsigned char)w->events;
701
702 #if EV_SELECT_IS_WINSOCKET
703 if (events)
704 {
705 unsigned long argp;
706 #ifdef EV_FD_TO_WIN32_HANDLE
707 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
708 #else
709 anfd->handle = _get_osfhandle (fd);
710 #endif
711 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
712 }
713 #endif
714
715 {
716 unsigned char o_events = anfd->events;
717 unsigned char o_reify = anfd->reify;
718
719 anfd->reify = 0;
720 anfd->events = events;
721
722 if (o_events != events || o_reify & EV_IOFDSET)
723 backend_modify (EV_A_ fd, o_events, events);
724 }
725 }
726
727 fdchangecnt = 0;
728 }
729
730 void inline_size
731 fd_change (EV_P_ int fd, int flags)
732 {
733 unsigned char reify = anfds [fd].reify;
734 anfds [fd].reify |= flags;
735
736 if (expect_true (!reify))
737 {
738 ++fdchangecnt;
739 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
740 fdchanges [fdchangecnt - 1] = fd;
741 }
742 }
743
744 void inline_speed
745 fd_kill (EV_P_ int fd)
746 {
747 ev_io *w;
748
749 while ((w = (ev_io *)anfds [fd].head))
750 {
751 ev_io_stop (EV_A_ w);
752 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
753 }
754 }
755
756 int inline_size
757 fd_valid (int fd)
758 {
759 #ifdef _WIN32
760 return _get_osfhandle (fd) != -1;
761 #else
762 return fcntl (fd, F_GETFD) != -1;
763 #endif
764 }
765
766 /* called on EBADF to verify fds */
767 static void noinline
768 fd_ebadf (EV_P)
769 {
770 int fd;
771
772 for (fd = 0; fd < anfdmax; ++fd)
773 if (anfds [fd].events)
774 if (!fd_valid (fd) == -1 && errno == EBADF)
775 fd_kill (EV_A_ fd);
776 }
777
778 /* called on ENOMEM in select/poll to kill some fds and retry */
779 static void noinline
780 fd_enomem (EV_P)
781 {
782 int fd;
783
784 for (fd = anfdmax; fd--; )
785 if (anfds [fd].events)
786 {
787 fd_kill (EV_A_ fd);
788 return;
789 }
790 }
791
792 /* usually called after fork if backend needs to re-arm all fds from scratch */
793 static void noinline
794 fd_rearm_all (EV_P)
795 {
796 int fd;
797
798 for (fd = 0; fd < anfdmax; ++fd)
799 if (anfds [fd].events)
800 {
801 anfds [fd].events = 0;
802 fd_change (EV_A_ fd, EV_IOFDSET | 1);
803 }
804 }
805
806 /*****************************************************************************/
807
808 /*
809 * the heap functions want a real array index. array index 0 uis guaranteed to not
810 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
811 * the branching factor of the d-tree.
812 */
813
814 /*
815 * at the moment we allow libev the luxury of two heaps,
816 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
817 * which is more cache-efficient.
818 * the difference is about 5% with 50000+ watchers.
819 */
820 #if EV_USE_4HEAP
821
822 #define DHEAP 4
823 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
824 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
825 #define UPHEAP_DONE(p,k) ((p) == (k))
826
827 /* away from the root */
828 void inline_speed
829 downheap (ANHE *heap, int N, int k)
830 {
831 ANHE he = heap [k];
832 ANHE *E = heap + N + HEAP0;
833
834 for (;;)
835 {
836 ev_tstamp minat;
837 ANHE *minpos;
838 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
839
840 /* find minimum child */
841 if (expect_true (pos + DHEAP - 1 < E))
842 {
843 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
844 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
845 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
846 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
847 }
848 else if (pos < E)
849 {
850 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
851 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
852 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
853 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
854 }
855 else
856 break;
857
858 if (ANHE_at (he) <= minat)
859 break;
860
861 heap [k] = *minpos;
862 ev_active (ANHE_w (*minpos)) = k;
863
864 k = minpos - heap;
865 }
866
867 heap [k] = he;
868 ev_active (ANHE_w (he)) = k;
869 }
870
871 #else /* 4HEAP */
872
873 #define HEAP0 1
874 #define HPARENT(k) ((k) >> 1)
875 #define UPHEAP_DONE(p,k) (!(p))
876
877 /* away from the root */
878 void inline_speed
879 downheap (ANHE *heap, int N, int k)
880 {
881 ANHE he = heap [k];
882
883 for (;;)
884 {
885 int c = k << 1;
886
887 if (c > N + HEAP0 - 1)
888 break;
889
890 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
891 ? 1 : 0;
892
893 if (ANHE_at (he) <= ANHE_at (heap [c]))
894 break;
895
896 heap [k] = heap [c];
897 ev_active (ANHE_w (heap [k])) = k;
898
899 k = c;
900 }
901
902 heap [k] = he;
903 ev_active (ANHE_w (he)) = k;
904 }
905 #endif
906
907 /* towards the root */
908 void inline_speed
909 upheap (ANHE *heap, int k)
910 {
911 ANHE he = heap [k];
912
913 for (;;)
914 {
915 int p = HPARENT (k);
916
917 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
918 break;
919
920 heap [k] = heap [p];
921 ev_active (ANHE_w (heap [k])) = k;
922 k = p;
923 }
924
925 heap [k] = he;
926 ev_active (ANHE_w (he)) = k;
927 }
928
929 void inline_size
930 adjustheap (ANHE *heap, int N, int k)
931 {
932 if (k > HEAP0 && ANHE_at (heap [HPARENT (k)]) >= ANHE_at (heap [k]))
933 upheap (heap, k);
934 else
935 downheap (heap, N, k);
936 }
937
938 /* rebuild the heap: this function is used only once and executed rarely */
939 void inline_size
940 reheap (ANHE *heap, int N)
941 {
942 int i;
943 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
944 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
945 for (i = 0; i < N; ++i)
946 upheap (heap, i + HEAP0);
947 }
948
949 #if EV_VERIFY
950 static void
951 checkheap (ANHE *heap, int N)
952 {
953 int i;
954
955 for (i = HEAP0; i < N + HEAP0; ++i)
956 {
957 assert (("active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
958 assert (("heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
959 assert (("heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
960 }
961 }
962 #endif
963
964 /*****************************************************************************/
965
966 typedef struct
967 {
968 WL head;
969 EV_ATOMIC_T gotsig;
970 } ANSIG;
971
972 static ANSIG *signals;
973 static int signalmax;
974
975 static EV_ATOMIC_T gotsig;
976
977 void inline_size
978 signals_init (ANSIG *base, int count)
979 {
980 while (count--)
981 {
982 base->head = 0;
983 base->gotsig = 0;
984
985 ++base;
986 }
987 }
988
989 /*****************************************************************************/
990
991 void inline_speed
992 fd_intern (int fd)
993 {
994 #ifdef _WIN32
995 int arg = 1;
996 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
997 #else
998 fcntl (fd, F_SETFD, FD_CLOEXEC);
999 fcntl (fd, F_SETFL, O_NONBLOCK);
1000 #endif
1001 }
1002
1003 static void noinline
1004 evpipe_init (EV_P)
1005 {
1006 if (!ev_is_active (&pipeev))
1007 {
1008 #if EV_USE_EVENTFD
1009 if ((evfd = eventfd (0, 0)) >= 0)
1010 {
1011 evpipe [0] = -1;
1012 fd_intern (evfd);
1013 ev_io_set (&pipeev, evfd, EV_READ);
1014 }
1015 else
1016 #endif
1017 {
1018 while (pipe (evpipe))
1019 syserr ("(libev) error creating signal/async pipe");
1020
1021 fd_intern (evpipe [0]);
1022 fd_intern (evpipe [1]);
1023 ev_io_set (&pipeev, evpipe [0], EV_READ);
1024 }
1025
1026 ev_io_start (EV_A_ &pipeev);
1027 ev_unref (EV_A); /* watcher should not keep loop alive */
1028 }
1029 }
1030
1031 void inline_size
1032 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1033 {
1034 if (!*flag)
1035 {
1036 int old_errno = errno; /* save errno because write might clobber it */
1037
1038 *flag = 1;
1039
1040 #if EV_USE_EVENTFD
1041 if (evfd >= 0)
1042 {
1043 uint64_t counter = 1;
1044 write (evfd, &counter, sizeof (uint64_t));
1045 }
1046 else
1047 #endif
1048 write (evpipe [1], &old_errno, 1);
1049
1050 errno = old_errno;
1051 }
1052 }
1053
1054 static void
1055 pipecb (EV_P_ ev_io *iow, int revents)
1056 {
1057 #if EV_USE_EVENTFD
1058 if (evfd >= 0)
1059 {
1060 uint64_t counter;
1061 read (evfd, &counter, sizeof (uint64_t));
1062 }
1063 else
1064 #endif
1065 {
1066 char dummy;
1067 read (evpipe [0], &dummy, 1);
1068 }
1069
1070 if (gotsig && ev_is_default_loop (EV_A))
1071 {
1072 int signum;
1073 gotsig = 0;
1074
1075 for (signum = signalmax; signum--; )
1076 if (signals [signum].gotsig)
1077 ev_feed_signal_event (EV_A_ signum + 1);
1078 }
1079
1080 #if EV_ASYNC_ENABLE
1081 if (gotasync)
1082 {
1083 int i;
1084 gotasync = 0;
1085
1086 for (i = asynccnt; i--; )
1087 if (asyncs [i]->sent)
1088 {
1089 asyncs [i]->sent = 0;
1090 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1091 }
1092 }
1093 #endif
1094 }
1095
1096 /*****************************************************************************/
1097
1098 static void
1099 ev_sighandler (int signum)
1100 {
1101 #if EV_MULTIPLICITY
1102 struct ev_loop *loop = &default_loop_struct;
1103 #endif
1104
1105 #if _WIN32
1106 signal (signum, ev_sighandler);
1107 #endif
1108
1109 signals [signum - 1].gotsig = 1;
1110 evpipe_write (EV_A_ &gotsig);
1111 }
1112
1113 void noinline
1114 ev_feed_signal_event (EV_P_ int signum)
1115 {
1116 WL w;
1117
1118 #if EV_MULTIPLICITY
1119 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1120 #endif
1121
1122 --signum;
1123
1124 if (signum < 0 || signum >= signalmax)
1125 return;
1126
1127 signals [signum].gotsig = 0;
1128
1129 for (w = signals [signum].head; w; w = w->next)
1130 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1131 }
1132
1133 /*****************************************************************************/
1134
1135 static WL childs [EV_PID_HASHSIZE];
1136
1137 #ifndef _WIN32
1138
1139 static ev_signal childev;
1140
1141 #ifndef WIFCONTINUED
1142 # define WIFCONTINUED(status) 0
1143 #endif
1144
1145 void inline_speed
1146 child_reap (EV_P_ int chain, int pid, int status)
1147 {
1148 ev_child *w;
1149 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1150
1151 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1152 {
1153 if ((w->pid == pid || !w->pid)
1154 && (!traced || (w->flags & 1)))
1155 {
1156 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1157 w->rpid = pid;
1158 w->rstatus = status;
1159 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1160 }
1161 }
1162 }
1163
1164 #ifndef WCONTINUED
1165 # define WCONTINUED 0
1166 #endif
1167
1168 static void
1169 childcb (EV_P_ ev_signal *sw, int revents)
1170 {
1171 int pid, status;
1172
1173 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1174 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1175 if (!WCONTINUED
1176 || errno != EINVAL
1177 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1178 return;
1179
1180 /* make sure we are called again until all children have been reaped */
1181 /* we need to do it this way so that the callback gets called before we continue */
1182 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1183
1184 child_reap (EV_A_ pid, pid, status);
1185 if (EV_PID_HASHSIZE > 1)
1186 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1187 }
1188
1189 #endif
1190
1191 /*****************************************************************************/
1192
1193 #if EV_USE_PORT
1194 # include "ev_port.c"
1195 #endif
1196 #if EV_USE_KQUEUE
1197 # include "ev_kqueue.c"
1198 #endif
1199 #if EV_USE_EPOLL
1200 # include "ev_epoll.c"
1201 #endif
1202 #if EV_USE_POLL
1203 # include "ev_poll.c"
1204 #endif
1205 #if EV_USE_SELECT
1206 # include "ev_select.c"
1207 #endif
1208
1209 int
1210 ev_version_major (void)
1211 {
1212 return EV_VERSION_MAJOR;
1213 }
1214
1215 int
1216 ev_version_minor (void)
1217 {
1218 return EV_VERSION_MINOR;
1219 }
1220
1221 /* return true if we are running with elevated privileges and should ignore env variables */
1222 int inline_size
1223 enable_secure (void)
1224 {
1225 #ifdef _WIN32
1226 return 0;
1227 #else
1228 return getuid () != geteuid ()
1229 || getgid () != getegid ();
1230 #endif
1231 }
1232
1233 unsigned int
1234 ev_supported_backends (void)
1235 {
1236 unsigned int flags = 0;
1237
1238 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1239 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1240 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1241 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1242 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1243
1244 return flags;
1245 }
1246
1247 unsigned int
1248 ev_recommended_backends (void)
1249 {
1250 unsigned int flags = ev_supported_backends ();
1251
1252 #ifndef __NetBSD__
1253 /* kqueue is borked on everything but netbsd apparently */
1254 /* it usually doesn't work correctly on anything but sockets and pipes */
1255 flags &= ~EVBACKEND_KQUEUE;
1256 #endif
1257 #ifdef __APPLE__
1258 // flags &= ~EVBACKEND_KQUEUE; for documentation
1259 flags &= ~EVBACKEND_POLL;
1260 #endif
1261
1262 return flags;
1263 }
1264
1265 unsigned int
1266 ev_embeddable_backends (void)
1267 {
1268 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1269
1270 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1271 /* please fix it and tell me how to detect the fix */
1272 flags &= ~EVBACKEND_EPOLL;
1273
1274 return flags;
1275 }
1276
1277 unsigned int
1278 ev_backend (EV_P)
1279 {
1280 return backend;
1281 }
1282
1283 unsigned int
1284 ev_loop_count (EV_P)
1285 {
1286 return loop_count;
1287 }
1288
1289 void
1290 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1291 {
1292 io_blocktime = interval;
1293 }
1294
1295 void
1296 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1297 {
1298 timeout_blocktime = interval;
1299 }
1300
1301 static void noinline
1302 loop_init (EV_P_ unsigned int flags)
1303 {
1304 if (!backend)
1305 {
1306 #if EV_USE_MONOTONIC
1307 {
1308 struct timespec ts;
1309 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1310 have_monotonic = 1;
1311 }
1312 #endif
1313
1314 ev_rt_now = ev_time ();
1315 mn_now = get_clock ();
1316 now_floor = mn_now;
1317 rtmn_diff = ev_rt_now - mn_now;
1318
1319 io_blocktime = 0.;
1320 timeout_blocktime = 0.;
1321 backend = 0;
1322 backend_fd = -1;
1323 gotasync = 0;
1324 #if EV_USE_INOTIFY
1325 fs_fd = -2;
1326 #endif
1327
1328 /* pid check not overridable via env */
1329 #ifndef _WIN32
1330 if (flags & EVFLAG_FORKCHECK)
1331 curpid = getpid ();
1332 #endif
1333
1334 if (!(flags & EVFLAG_NOENV)
1335 && !enable_secure ()
1336 && getenv ("LIBEV_FLAGS"))
1337 flags = atoi (getenv ("LIBEV_FLAGS"));
1338
1339 if (!(flags & 0x0000ffffU))
1340 flags |= ev_recommended_backends ();
1341
1342 #if EV_USE_PORT
1343 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1344 #endif
1345 #if EV_USE_KQUEUE
1346 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1347 #endif
1348 #if EV_USE_EPOLL
1349 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1350 #endif
1351 #if EV_USE_POLL
1352 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1353 #endif
1354 #if EV_USE_SELECT
1355 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1356 #endif
1357
1358 ev_init (&pipeev, pipecb);
1359 ev_set_priority (&pipeev, EV_MAXPRI);
1360 }
1361 }
1362
1363 static void noinline
1364 loop_destroy (EV_P)
1365 {
1366 int i;
1367
1368 if (ev_is_active (&pipeev))
1369 {
1370 ev_ref (EV_A); /* signal watcher */
1371 ev_io_stop (EV_A_ &pipeev);
1372
1373 #if EV_USE_EVENTFD
1374 if (evfd >= 0)
1375 close (evfd);
1376 #endif
1377
1378 if (evpipe [0] >= 0)
1379 {
1380 close (evpipe [0]);
1381 close (evpipe [1]);
1382 }
1383 }
1384
1385 #if EV_USE_INOTIFY
1386 if (fs_fd >= 0)
1387 close (fs_fd);
1388 #endif
1389
1390 if (backend_fd >= 0)
1391 close (backend_fd);
1392
1393 #if EV_USE_PORT
1394 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1395 #endif
1396 #if EV_USE_KQUEUE
1397 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1398 #endif
1399 #if EV_USE_EPOLL
1400 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1401 #endif
1402 #if EV_USE_POLL
1403 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1404 #endif
1405 #if EV_USE_SELECT
1406 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1407 #endif
1408
1409 for (i = NUMPRI; i--; )
1410 {
1411 array_free (pending, [i]);
1412 #if EV_IDLE_ENABLE
1413 array_free (idle, [i]);
1414 #endif
1415 }
1416
1417 ev_free (anfds); anfdmax = 0;
1418
1419 /* have to use the microsoft-never-gets-it-right macro */
1420 array_free (fdchange, EMPTY);
1421 array_free (timer, EMPTY);
1422 #if EV_PERIODIC_ENABLE
1423 array_free (periodic, EMPTY);
1424 #endif
1425 #if EV_FORK_ENABLE
1426 array_free (fork, EMPTY);
1427 #endif
1428 array_free (prepare, EMPTY);
1429 array_free (check, EMPTY);
1430 #if EV_ASYNC_ENABLE
1431 array_free (async, EMPTY);
1432 #endif
1433
1434 backend = 0;
1435 }
1436
1437 #if EV_USE_INOTIFY
1438 void inline_size infy_fork (EV_P);
1439 #endif
1440
1441 void inline_size
1442 loop_fork (EV_P)
1443 {
1444 #if EV_USE_PORT
1445 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1446 #endif
1447 #if EV_USE_KQUEUE
1448 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1449 #endif
1450 #if EV_USE_EPOLL
1451 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1452 #endif
1453 #if EV_USE_INOTIFY
1454 infy_fork (EV_A);
1455 #endif
1456
1457 if (ev_is_active (&pipeev))
1458 {
1459 /* this "locks" the handlers against writing to the pipe */
1460 /* while we modify the fd vars */
1461 gotsig = 1;
1462 #if EV_ASYNC_ENABLE
1463 gotasync = 1;
1464 #endif
1465
1466 ev_ref (EV_A);
1467 ev_io_stop (EV_A_ &pipeev);
1468
1469 #if EV_USE_EVENTFD
1470 if (evfd >= 0)
1471 close (evfd);
1472 #endif
1473
1474 if (evpipe [0] >= 0)
1475 {
1476 close (evpipe [0]);
1477 close (evpipe [1]);
1478 }
1479
1480 evpipe_init (EV_A);
1481 /* now iterate over everything, in case we missed something */
1482 pipecb (EV_A_ &pipeev, EV_READ);
1483 }
1484
1485 postfork = 0;
1486 }
1487
1488 #if EV_MULTIPLICITY
1489 struct ev_loop *
1490 ev_loop_new (unsigned int flags)
1491 {
1492 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1493
1494 memset (loop, 0, sizeof (struct ev_loop));
1495
1496 loop_init (EV_A_ flags);
1497
1498 if (ev_backend (EV_A))
1499 return loop;
1500
1501 return 0;
1502 }
1503
1504 void
1505 ev_loop_destroy (EV_P)
1506 {
1507 loop_destroy (EV_A);
1508 ev_free (loop);
1509 }
1510
1511 void
1512 ev_loop_fork (EV_P)
1513 {
1514 postfork = 1; /* must be in line with ev_default_fork */
1515 }
1516
1517 #if EV_VERIFY
1518 static void
1519 array_check (W **ws, int cnt)
1520 {
1521 while (cnt--)
1522 assert (("active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1523 }
1524
1525 static void
1526 ev_loop_verify (EV_P)
1527 {
1528 int i;
1529
1530 checkheap (timers, timercnt);
1531 #if EV_PERIODIC_ENABLE
1532 checkheap (periodics, periodiccnt);
1533 #endif
1534
1535 #if EV_IDLE_ENABLE
1536 for (i = NUMPRI; i--; )
1537 array_check ((W **)idles [i], idlecnt [i]);
1538 #endif
1539 #if EV_FORK_ENABLE
1540 array_check ((W **)forks, forkcnt);
1541 #endif
1542 array_check ((W **)prepares, preparecnt);
1543 array_check ((W **)checks, checkcnt);
1544 #if EV_ASYNC_ENABLE
1545 array_check ((W **)asyncs, asynccnt);
1546 #endif
1547 }
1548 #endif
1549
1550 #endif
1551
1552 #if EV_MULTIPLICITY
1553 struct ev_loop *
1554 ev_default_loop_init (unsigned int flags)
1555 #else
1556 int
1557 ev_default_loop (unsigned int flags)
1558 #endif
1559 {
1560 if (!ev_default_loop_ptr)
1561 {
1562 #if EV_MULTIPLICITY
1563 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1564 #else
1565 ev_default_loop_ptr = 1;
1566 #endif
1567
1568 loop_init (EV_A_ flags);
1569
1570 if (ev_backend (EV_A))
1571 {
1572 #ifndef _WIN32
1573 ev_signal_init (&childev, childcb, SIGCHLD);
1574 ev_set_priority (&childev, EV_MAXPRI);
1575 ev_signal_start (EV_A_ &childev);
1576 ev_unref (EV_A); /* child watcher should not keep loop alive */
1577 #endif
1578 }
1579 else
1580 ev_default_loop_ptr = 0;
1581 }
1582
1583 return ev_default_loop_ptr;
1584 }
1585
1586 void
1587 ev_default_destroy (void)
1588 {
1589 #if EV_MULTIPLICITY
1590 struct ev_loop *loop = ev_default_loop_ptr;
1591 #endif
1592
1593 #ifndef _WIN32
1594 ev_ref (EV_A); /* child watcher */
1595 ev_signal_stop (EV_A_ &childev);
1596 #endif
1597
1598 loop_destroy (EV_A);
1599 }
1600
1601 void
1602 ev_default_fork (void)
1603 {
1604 #if EV_MULTIPLICITY
1605 struct ev_loop *loop = ev_default_loop_ptr;
1606 #endif
1607
1608 if (backend)
1609 postfork = 1; /* must be in line with ev_loop_fork */
1610 }
1611
1612 /*****************************************************************************/
1613
1614 void
1615 ev_invoke (EV_P_ void *w, int revents)
1616 {
1617 EV_CB_INVOKE ((W)w, revents);
1618 }
1619
1620 void inline_speed
1621 call_pending (EV_P)
1622 {
1623 int pri;
1624
1625 EV_FREQUENT_CHECK;
1626
1627 for (pri = NUMPRI; pri--; )
1628 while (pendingcnt [pri])
1629 {
1630 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1631
1632 if (expect_true (p->w))
1633 {
1634 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1635
1636 p->w->pending = 0;
1637 EV_CB_INVOKE (p->w, p->events);
1638 }
1639 }
1640
1641 EV_FREQUENT_CHECK;
1642 }
1643
1644 #if EV_IDLE_ENABLE
1645 void inline_size
1646 idle_reify (EV_P)
1647 {
1648 if (expect_false (idleall))
1649 {
1650 int pri;
1651
1652 for (pri = NUMPRI; pri--; )
1653 {
1654 if (pendingcnt [pri])
1655 break;
1656
1657 if (idlecnt [pri])
1658 {
1659 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1660 break;
1661 }
1662 }
1663 }
1664 }
1665 #endif
1666
1667 void inline_size
1668 timers_reify (EV_P)
1669 {
1670 EV_FREQUENT_CHECK;
1671
1672 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
1673 {
1674 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
1675
1676 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1677
1678 /* first reschedule or stop timer */
1679 if (w->repeat)
1680 {
1681 ev_at (w) += w->repeat;
1682 if (ev_at (w) < mn_now)
1683 ev_at (w) = mn_now;
1684
1685 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1686
1687 ANHE_at_cache (timers [HEAP0]);
1688 downheap (timers, timercnt, HEAP0);
1689 }
1690 else
1691 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1692
1693 EV_FREQUENT_CHECK;
1694 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1695 }
1696 }
1697
1698 #if EV_PERIODIC_ENABLE
1699 void inline_size
1700 periodics_reify (EV_P)
1701 {
1702 EV_FREQUENT_CHECK;
1703 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
1704 {
1705 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
1706
1707 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1708
1709 /* first reschedule or stop timer */
1710 if (w->reschedule_cb)
1711 {
1712 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1713
1714 assert (("ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
1715
1716 ANHE_at_cache (periodics [HEAP0]);
1717 downheap (periodics, periodiccnt, HEAP0);
1718 EV_FREQUENT_CHECK;
1719 }
1720 else if (w->interval)
1721 {
1722 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1723 /* if next trigger time is not sufficiently in the future, put it there */
1724 /* this might happen because of floating point inexactness */
1725 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
1726 {
1727 ev_at (w) += w->interval;
1728
1729 /* if interval is unreasonably low we might still have a time in the past */
1730 /* so correct this. this will make the periodic very inexact, but the user */
1731 /* has effectively asked to get triggered more often than possible */
1732 if (ev_at (w) < ev_rt_now)
1733 ev_at (w) = ev_rt_now;
1734 }
1735
1736 ANHE_at_cache (periodics [HEAP0]);
1737 downheap (periodics, periodiccnt, HEAP0);
1738 }
1739 else
1740 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1741
1742 EV_FREQUENT_CHECK;
1743 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1744 }
1745 }
1746
1747 static void noinline
1748 periodics_reschedule (EV_P)
1749 {
1750 int i;
1751
1752 /* adjust periodics after time jump */
1753 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
1754 {
1755 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
1756
1757 if (w->reschedule_cb)
1758 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1759 else if (w->interval)
1760 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1761
1762 ANHE_at_cache (periodics [i]);
1763 }
1764
1765 reheap (periodics, periodiccnt);
1766 }
1767 #endif
1768
1769 void inline_speed
1770 time_update (EV_P_ ev_tstamp max_block)
1771 {
1772 int i;
1773
1774 #if EV_USE_MONOTONIC
1775 if (expect_true (have_monotonic))
1776 {
1777 ev_tstamp odiff = rtmn_diff;
1778
1779 mn_now = get_clock ();
1780
1781 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1782 /* interpolate in the meantime */
1783 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1784 {
1785 ev_rt_now = rtmn_diff + mn_now;
1786 return;
1787 }
1788
1789 now_floor = mn_now;
1790 ev_rt_now = ev_time ();
1791
1792 /* loop a few times, before making important decisions.
1793 * on the choice of "4": one iteration isn't enough,
1794 * in case we get preempted during the calls to
1795 * ev_time and get_clock. a second call is almost guaranteed
1796 * to succeed in that case, though. and looping a few more times
1797 * doesn't hurt either as we only do this on time-jumps or
1798 * in the unlikely event of having been preempted here.
1799 */
1800 for (i = 4; --i; )
1801 {
1802 rtmn_diff = ev_rt_now - mn_now;
1803
1804 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
1805 return; /* all is well */
1806
1807 ev_rt_now = ev_time ();
1808 mn_now = get_clock ();
1809 now_floor = mn_now;
1810 }
1811
1812 # if EV_PERIODIC_ENABLE
1813 periodics_reschedule (EV_A);
1814 # endif
1815 /* no timer adjustment, as the monotonic clock doesn't jump */
1816 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1817 }
1818 else
1819 #endif
1820 {
1821 ev_rt_now = ev_time ();
1822
1823 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1824 {
1825 #if EV_PERIODIC_ENABLE
1826 periodics_reschedule (EV_A);
1827 #endif
1828 /* adjust timers. this is easy, as the offset is the same for all of them */
1829 for (i = 0; i < timercnt; ++i)
1830 {
1831 ANHE *he = timers + i + HEAP0;
1832 ANHE_w (*he)->at += ev_rt_now - mn_now;
1833 ANHE_at_cache (*he);
1834 }
1835 }
1836
1837 mn_now = ev_rt_now;
1838 }
1839 }
1840
1841 void
1842 ev_ref (EV_P)
1843 {
1844 ++activecnt;
1845 }
1846
1847 void
1848 ev_unref (EV_P)
1849 {
1850 --activecnt;
1851 }
1852
1853 static int loop_done;
1854
1855 void
1856 ev_loop (EV_P_ int flags)
1857 {
1858 loop_done = EVUNLOOP_CANCEL;
1859
1860 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1861
1862 do
1863 {
1864 #ifndef _WIN32
1865 if (expect_false (curpid)) /* penalise the forking check even more */
1866 if (expect_false (getpid () != curpid))
1867 {
1868 curpid = getpid ();
1869 postfork = 1;
1870 }
1871 #endif
1872
1873 #if EV_FORK_ENABLE
1874 /* we might have forked, so queue fork handlers */
1875 if (expect_false (postfork))
1876 if (forkcnt)
1877 {
1878 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1879 call_pending (EV_A);
1880 }
1881 #endif
1882
1883 /* queue prepare watchers (and execute them) */
1884 if (expect_false (preparecnt))
1885 {
1886 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1887 call_pending (EV_A);
1888 }
1889
1890 if (expect_false (!activecnt))
1891 break;
1892
1893 /* we might have forked, so reify kernel state if necessary */
1894 if (expect_false (postfork))
1895 loop_fork (EV_A);
1896
1897 /* update fd-related kernel structures */
1898 fd_reify (EV_A);
1899
1900 /* calculate blocking time */
1901 {
1902 ev_tstamp waittime = 0.;
1903 ev_tstamp sleeptime = 0.;
1904
1905 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1906 {
1907 /* update time to cancel out callback processing overhead */
1908 time_update (EV_A_ 1e100);
1909
1910 waittime = MAX_BLOCKTIME;
1911
1912 if (timercnt)
1913 {
1914 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
1915 if (waittime > to) waittime = to;
1916 }
1917
1918 #if EV_PERIODIC_ENABLE
1919 if (periodiccnt)
1920 {
1921 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
1922 if (waittime > to) waittime = to;
1923 }
1924 #endif
1925
1926 if (expect_false (waittime < timeout_blocktime))
1927 waittime = timeout_blocktime;
1928
1929 sleeptime = waittime - backend_fudge;
1930
1931 if (expect_true (sleeptime > io_blocktime))
1932 sleeptime = io_blocktime;
1933
1934 if (sleeptime)
1935 {
1936 ev_sleep (sleeptime);
1937 waittime -= sleeptime;
1938 }
1939 }
1940
1941 ++loop_count;
1942 backend_poll (EV_A_ waittime);
1943
1944 /* update ev_rt_now, do magic */
1945 time_update (EV_A_ waittime + sleeptime);
1946 }
1947
1948 /* queue pending timers and reschedule them */
1949 timers_reify (EV_A); /* relative timers called last */
1950 #if EV_PERIODIC_ENABLE
1951 periodics_reify (EV_A); /* absolute timers called first */
1952 #endif
1953
1954 #if EV_IDLE_ENABLE
1955 /* queue idle watchers unless other events are pending */
1956 idle_reify (EV_A);
1957 #endif
1958
1959 /* queue check watchers, to be executed first */
1960 if (expect_false (checkcnt))
1961 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1962
1963 call_pending (EV_A);
1964 }
1965 while (expect_true (
1966 activecnt
1967 && !loop_done
1968 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
1969 ));
1970
1971 if (loop_done == EVUNLOOP_ONE)
1972 loop_done = EVUNLOOP_CANCEL;
1973 }
1974
1975 void
1976 ev_unloop (EV_P_ int how)
1977 {
1978 loop_done = how;
1979 }
1980
1981 /*****************************************************************************/
1982
1983 void inline_size
1984 wlist_add (WL *head, WL elem)
1985 {
1986 elem->next = *head;
1987 *head = elem;
1988 }
1989
1990 void inline_size
1991 wlist_del (WL *head, WL elem)
1992 {
1993 while (*head)
1994 {
1995 if (*head == elem)
1996 {
1997 *head = elem->next;
1998 return;
1999 }
2000
2001 head = &(*head)->next;
2002 }
2003 }
2004
2005 void inline_speed
2006 clear_pending (EV_P_ W w)
2007 {
2008 if (w->pending)
2009 {
2010 pendings [ABSPRI (w)][w->pending - 1].w = 0;
2011 w->pending = 0;
2012 }
2013 }
2014
2015 int
2016 ev_clear_pending (EV_P_ void *w)
2017 {
2018 W w_ = (W)w;
2019 int pending = w_->pending;
2020
2021 if (expect_true (pending))
2022 {
2023 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2024 w_->pending = 0;
2025 p->w = 0;
2026 return p->events;
2027 }
2028 else
2029 return 0;
2030 }
2031
2032 void inline_size
2033 pri_adjust (EV_P_ W w)
2034 {
2035 int pri = w->priority;
2036 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2037 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2038 w->priority = pri;
2039 }
2040
2041 void inline_speed
2042 ev_start (EV_P_ W w, int active)
2043 {
2044 pri_adjust (EV_A_ w);
2045 w->active = active;
2046 ev_ref (EV_A);
2047 }
2048
2049 void inline_size
2050 ev_stop (EV_P_ W w)
2051 {
2052 ev_unref (EV_A);
2053 w->active = 0;
2054 }
2055
2056 /*****************************************************************************/
2057
2058 void noinline
2059 ev_io_start (EV_P_ ev_io *w)
2060 {
2061 int fd = w->fd;
2062
2063 if (expect_false (ev_is_active (w)))
2064 return;
2065
2066 assert (("ev_io_start called with negative fd", fd >= 0));
2067
2068 EV_FREQUENT_CHECK;
2069
2070 ev_start (EV_A_ (W)w, 1);
2071 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
2072 wlist_add (&anfds[fd].head, (WL)w);
2073
2074 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
2075 w->events &= ~EV_IOFDSET;
2076
2077 EV_FREQUENT_CHECK;
2078 }
2079
2080 void noinline
2081 ev_io_stop (EV_P_ ev_io *w)
2082 {
2083 clear_pending (EV_A_ (W)w);
2084 if (expect_false (!ev_is_active (w)))
2085 return;
2086
2087 assert (("ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2088
2089 EV_FREQUENT_CHECK;
2090
2091 wlist_del (&anfds[w->fd].head, (WL)w);
2092 ev_stop (EV_A_ (W)w);
2093
2094 fd_change (EV_A_ w->fd, 1);
2095
2096 EV_FREQUENT_CHECK;
2097 }
2098
2099 void noinline
2100 ev_timer_start (EV_P_ ev_timer *w)
2101 {
2102 if (expect_false (ev_is_active (w)))
2103 return;
2104
2105 ev_at (w) += mn_now;
2106
2107 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2108
2109 EV_FREQUENT_CHECK;
2110
2111 ++timercnt;
2112 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2113 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2114 ANHE_w (timers [ev_active (w)]) = (WT)w;
2115 ANHE_at_cache (timers [ev_active (w)]);
2116 upheap (timers, ev_active (w));
2117
2118 EV_FREQUENT_CHECK;
2119
2120 /*assert (("internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2121 }
2122
2123 void noinline
2124 ev_timer_stop (EV_P_ ev_timer *w)
2125 {
2126 clear_pending (EV_A_ (W)w);
2127 if (expect_false (!ev_is_active (w)))
2128 return;
2129
2130 EV_FREQUENT_CHECK;
2131
2132 {
2133 int active = ev_active (w);
2134
2135 assert (("internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2136
2137 --timercnt;
2138
2139 if (expect_true (active < timercnt + HEAP0))
2140 {
2141 timers [active] = timers [timercnt + HEAP0];
2142 adjustheap (timers, timercnt, active);
2143 }
2144 }
2145
2146 EV_FREQUENT_CHECK;
2147
2148 ev_at (w) -= mn_now;
2149
2150 ev_stop (EV_A_ (W)w);
2151 }
2152
2153 void noinline
2154 ev_timer_again (EV_P_ ev_timer *w)
2155 {
2156 EV_FREQUENT_CHECK;
2157
2158 if (ev_is_active (w))
2159 {
2160 if (w->repeat)
2161 {
2162 ev_at (w) = mn_now + w->repeat;
2163 ANHE_at_cache (timers [ev_active (w)]);
2164 adjustheap (timers, timercnt, ev_active (w));
2165 }
2166 else
2167 ev_timer_stop (EV_A_ w);
2168 }
2169 else if (w->repeat)
2170 {
2171 ev_at (w) = w->repeat;
2172 ev_timer_start (EV_A_ w);
2173 }
2174
2175 EV_FREQUENT_CHECK;
2176 }
2177
2178 #if EV_PERIODIC_ENABLE
2179 void noinline
2180 ev_periodic_start (EV_P_ ev_periodic *w)
2181 {
2182 if (expect_false (ev_is_active (w)))
2183 return;
2184
2185 if (w->reschedule_cb)
2186 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2187 else if (w->interval)
2188 {
2189 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
2190 /* this formula differs from the one in periodic_reify because we do not always round up */
2191 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2192 }
2193 else
2194 ev_at (w) = w->offset;
2195
2196 EV_FREQUENT_CHECK;
2197
2198 ++periodiccnt;
2199 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2200 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2201 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2202 ANHE_at_cache (periodics [ev_active (w)]);
2203 upheap (periodics, ev_active (w));
2204
2205 EV_FREQUENT_CHECK;
2206
2207 /*assert (("internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2208 }
2209
2210 void noinline
2211 ev_periodic_stop (EV_P_ ev_periodic *w)
2212 {
2213 clear_pending (EV_A_ (W)w);
2214 if (expect_false (!ev_is_active (w)))
2215 return;
2216
2217 EV_FREQUENT_CHECK;
2218
2219 {
2220 int active = ev_active (w);
2221
2222 assert (("internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2223
2224 --periodiccnt;
2225
2226 if (expect_true (active < periodiccnt + HEAP0))
2227 {
2228 periodics [active] = periodics [periodiccnt + HEAP0];
2229 adjustheap (periodics, periodiccnt, active);
2230 }
2231 }
2232
2233 EV_FREQUENT_CHECK;
2234
2235 ev_stop (EV_A_ (W)w);
2236 }
2237
2238 void noinline
2239 ev_periodic_again (EV_P_ ev_periodic *w)
2240 {
2241 /* TODO: use adjustheap and recalculation */
2242 ev_periodic_stop (EV_A_ w);
2243 ev_periodic_start (EV_A_ w);
2244 }
2245 #endif
2246
2247 #ifndef SA_RESTART
2248 # define SA_RESTART 0
2249 #endif
2250
2251 void noinline
2252 ev_signal_start (EV_P_ ev_signal *w)
2253 {
2254 #if EV_MULTIPLICITY
2255 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2256 #endif
2257 if (expect_false (ev_is_active (w)))
2258 return;
2259
2260 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2261
2262 evpipe_init (EV_A);
2263
2264 EV_FREQUENT_CHECK;
2265
2266 {
2267 #ifndef _WIN32
2268 sigset_t full, prev;
2269 sigfillset (&full);
2270 sigprocmask (SIG_SETMASK, &full, &prev);
2271 #endif
2272
2273 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2274
2275 #ifndef _WIN32
2276 sigprocmask (SIG_SETMASK, &prev, 0);
2277 #endif
2278 }
2279
2280 ev_start (EV_A_ (W)w, 1);
2281 wlist_add (&signals [w->signum - 1].head, (WL)w);
2282
2283 if (!((WL)w)->next)
2284 {
2285 #if _WIN32
2286 signal (w->signum, ev_sighandler);
2287 #else
2288 struct sigaction sa;
2289 sa.sa_handler = ev_sighandler;
2290 sigfillset (&sa.sa_mask);
2291 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2292 sigaction (w->signum, &sa, 0);
2293 #endif
2294 }
2295
2296 EV_FREQUENT_CHECK;
2297 }
2298
2299 void noinline
2300 ev_signal_stop (EV_P_ ev_signal *w)
2301 {
2302 clear_pending (EV_A_ (W)w);
2303 if (expect_false (!ev_is_active (w)))
2304 return;
2305
2306 EV_FREQUENT_CHECK;
2307
2308 wlist_del (&signals [w->signum - 1].head, (WL)w);
2309 ev_stop (EV_A_ (W)w);
2310
2311 if (!signals [w->signum - 1].head)
2312 signal (w->signum, SIG_DFL);
2313
2314 EV_FREQUENT_CHECK;
2315 }
2316
2317 void
2318 ev_child_start (EV_P_ ev_child *w)
2319 {
2320 #if EV_MULTIPLICITY
2321 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2322 #endif
2323 if (expect_false (ev_is_active (w)))
2324 return;
2325
2326 EV_FREQUENT_CHECK;
2327
2328 ev_start (EV_A_ (W)w, 1);
2329 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2330
2331 EV_FREQUENT_CHECK;
2332 }
2333
2334 void
2335 ev_child_stop (EV_P_ ev_child *w)
2336 {
2337 clear_pending (EV_A_ (W)w);
2338 if (expect_false (!ev_is_active (w)))
2339 return;
2340
2341 EV_FREQUENT_CHECK;
2342
2343 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2344 ev_stop (EV_A_ (W)w);
2345
2346 EV_FREQUENT_CHECK;
2347 }
2348
2349 #if EV_STAT_ENABLE
2350
2351 # ifdef _WIN32
2352 # undef lstat
2353 # define lstat(a,b) _stati64 (a,b)
2354 # endif
2355
2356 #define DEF_STAT_INTERVAL 5.0074891
2357 #define MIN_STAT_INTERVAL 0.1074891
2358
2359 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2360
2361 #if EV_USE_INOTIFY
2362 # define EV_INOTIFY_BUFSIZE 8192
2363
2364 static void noinline
2365 infy_add (EV_P_ ev_stat *w)
2366 {
2367 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);
2368
2369 if (w->wd < 0)
2370 {
2371 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2372
2373 /* monitor some parent directory for speedup hints */
2374 /* note that exceeding the hardcoded limit is not a correctness issue, */
2375 /* but an efficiency issue only */
2376 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2377 {
2378 char path [4096];
2379 strcpy (path, w->path);
2380
2381 do
2382 {
2383 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2384 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2385
2386 char *pend = strrchr (path, '/');
2387
2388 if (!pend)
2389 break; /* whoops, no '/', complain to your admin */
2390
2391 *pend = 0;
2392 w->wd = inotify_add_watch (fs_fd, path, mask);
2393 }
2394 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2395 }
2396 }
2397 else
2398 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2399
2400 if (w->wd >= 0)
2401 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2402 }
2403
2404 static void noinline
2405 infy_del (EV_P_ ev_stat *w)
2406 {
2407 int slot;
2408 int wd = w->wd;
2409
2410 if (wd < 0)
2411 return;
2412
2413 w->wd = -2;
2414 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2415 wlist_del (&fs_hash [slot].head, (WL)w);
2416
2417 /* remove this watcher, if others are watching it, they will rearm */
2418 inotify_rm_watch (fs_fd, wd);
2419 }
2420
2421 static void noinline
2422 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2423 {
2424 if (slot < 0)
2425 /* overflow, need to check for all hahs slots */
2426 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2427 infy_wd (EV_A_ slot, wd, ev);
2428 else
2429 {
2430 WL w_;
2431
2432 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2433 {
2434 ev_stat *w = (ev_stat *)w_;
2435 w_ = w_->next; /* lets us remove this watcher and all before it */
2436
2437 if (w->wd == wd || wd == -1)
2438 {
2439 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2440 {
2441 w->wd = -1;
2442 infy_add (EV_A_ w); /* re-add, no matter what */
2443 }
2444
2445 stat_timer_cb (EV_A_ &w->timer, 0);
2446 }
2447 }
2448 }
2449 }
2450
2451 static void
2452 infy_cb (EV_P_ ev_io *w, int revents)
2453 {
2454 char buf [EV_INOTIFY_BUFSIZE];
2455 struct inotify_event *ev = (struct inotify_event *)buf;
2456 int ofs;
2457 int len = read (fs_fd, buf, sizeof (buf));
2458
2459 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2460 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2461 }
2462
2463 void inline_size
2464 infy_init (EV_P)
2465 {
2466 if (fs_fd != -2)
2467 return;
2468
2469 fs_fd = inotify_init ();
2470
2471 if (fs_fd >= 0)
2472 {
2473 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2474 ev_set_priority (&fs_w, EV_MAXPRI);
2475 ev_io_start (EV_A_ &fs_w);
2476 }
2477 }
2478
2479 void inline_size
2480 infy_fork (EV_P)
2481 {
2482 int slot;
2483
2484 if (fs_fd < 0)
2485 return;
2486
2487 close (fs_fd);
2488 fs_fd = inotify_init ();
2489
2490 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2491 {
2492 WL w_ = fs_hash [slot].head;
2493 fs_hash [slot].head = 0;
2494
2495 while (w_)
2496 {
2497 ev_stat *w = (ev_stat *)w_;
2498 w_ = w_->next; /* lets us add this watcher */
2499
2500 w->wd = -1;
2501
2502 if (fs_fd >= 0)
2503 infy_add (EV_A_ w); /* re-add, no matter what */
2504 else
2505 ev_timer_start (EV_A_ &w->timer);
2506 }
2507
2508 }
2509 }
2510
2511 #endif
2512
2513 void
2514 ev_stat_stat (EV_P_ ev_stat *w)
2515 {
2516 if (lstat (w->path, &w->attr) < 0)
2517 w->attr.st_nlink = 0;
2518 else if (!w->attr.st_nlink)
2519 w->attr.st_nlink = 1;
2520 }
2521
2522 static void noinline
2523 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2524 {
2525 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2526
2527 /* we copy this here each the time so that */
2528 /* prev has the old value when the callback gets invoked */
2529 w->prev = w->attr;
2530 ev_stat_stat (EV_A_ w);
2531
2532 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2533 if (
2534 w->prev.st_dev != w->attr.st_dev
2535 || w->prev.st_ino != w->attr.st_ino
2536 || w->prev.st_mode != w->attr.st_mode
2537 || w->prev.st_nlink != w->attr.st_nlink
2538 || w->prev.st_uid != w->attr.st_uid
2539 || w->prev.st_gid != w->attr.st_gid
2540 || w->prev.st_rdev != w->attr.st_rdev
2541 || w->prev.st_size != w->attr.st_size
2542 || w->prev.st_atime != w->attr.st_atime
2543 || w->prev.st_mtime != w->attr.st_mtime
2544 || w->prev.st_ctime != w->attr.st_ctime
2545 ) {
2546 #if EV_USE_INOTIFY
2547 infy_del (EV_A_ w);
2548 infy_add (EV_A_ w);
2549 ev_stat_stat (EV_A_ w); /* avoid race... */
2550 #endif
2551
2552 ev_feed_event (EV_A_ w, EV_STAT);
2553 }
2554 }
2555
2556 void
2557 ev_stat_start (EV_P_ ev_stat *w)
2558 {
2559 if (expect_false (ev_is_active (w)))
2560 return;
2561
2562 /* since we use memcmp, we need to clear any padding data etc. */
2563 memset (&w->prev, 0, sizeof (ev_statdata));
2564 memset (&w->attr, 0, sizeof (ev_statdata));
2565
2566 ev_stat_stat (EV_A_ w);
2567
2568 if (w->interval < MIN_STAT_INTERVAL)
2569 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2570
2571 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2572 ev_set_priority (&w->timer, ev_priority (w));
2573
2574 #if EV_USE_INOTIFY
2575 infy_init (EV_A);
2576
2577 if (fs_fd >= 0)
2578 infy_add (EV_A_ w);
2579 else
2580 #endif
2581 ev_timer_start (EV_A_ &w->timer);
2582
2583 ev_start (EV_A_ (W)w, 1);
2584
2585 EV_FREQUENT_CHECK;
2586 }
2587
2588 void
2589 ev_stat_stop (EV_P_ ev_stat *w)
2590 {
2591 clear_pending (EV_A_ (W)w);
2592 if (expect_false (!ev_is_active (w)))
2593 return;
2594
2595 EV_FREQUENT_CHECK;
2596
2597 #if EV_USE_INOTIFY
2598 infy_del (EV_A_ w);
2599 #endif
2600 ev_timer_stop (EV_A_ &w->timer);
2601
2602 ev_stop (EV_A_ (W)w);
2603
2604 EV_FREQUENT_CHECK;
2605 }
2606 #endif
2607
2608 #if EV_IDLE_ENABLE
2609 void
2610 ev_idle_start (EV_P_ ev_idle *w)
2611 {
2612 if (expect_false (ev_is_active (w)))
2613 return;
2614
2615 pri_adjust (EV_A_ (W)w);
2616
2617 EV_FREQUENT_CHECK;
2618
2619 {
2620 int active = ++idlecnt [ABSPRI (w)];
2621
2622 ++idleall;
2623 ev_start (EV_A_ (W)w, active);
2624
2625 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2626 idles [ABSPRI (w)][active - 1] = w;
2627 }
2628
2629 EV_FREQUENT_CHECK;
2630 }
2631
2632 void
2633 ev_idle_stop (EV_P_ ev_idle *w)
2634 {
2635 clear_pending (EV_A_ (W)w);
2636 if (expect_false (!ev_is_active (w)))
2637 return;
2638
2639 EV_FREQUENT_CHECK;
2640
2641 {
2642 int active = ev_active (w);
2643
2644 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2645 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2646
2647 ev_stop (EV_A_ (W)w);
2648 --idleall;
2649 }
2650
2651 EV_FREQUENT_CHECK;
2652 }
2653 #endif
2654
2655 void
2656 ev_prepare_start (EV_P_ ev_prepare *w)
2657 {
2658 if (expect_false (ev_is_active (w)))
2659 return;
2660
2661 EV_FREQUENT_CHECK;
2662
2663 ev_start (EV_A_ (W)w, ++preparecnt);
2664 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2665 prepares [preparecnt - 1] = w;
2666
2667 EV_FREQUENT_CHECK;
2668 }
2669
2670 void
2671 ev_prepare_stop (EV_P_ ev_prepare *w)
2672 {
2673 clear_pending (EV_A_ (W)w);
2674 if (expect_false (!ev_is_active (w)))
2675 return;
2676
2677 EV_FREQUENT_CHECK;
2678
2679 {
2680 int active = ev_active (w);
2681
2682 prepares [active - 1] = prepares [--preparecnt];
2683 ev_active (prepares [active - 1]) = active;
2684 }
2685
2686 ev_stop (EV_A_ (W)w);
2687
2688 EV_FREQUENT_CHECK;
2689 }
2690
2691 void
2692 ev_check_start (EV_P_ ev_check *w)
2693 {
2694 if (expect_false (ev_is_active (w)))
2695 return;
2696
2697 EV_FREQUENT_CHECK;
2698
2699 ev_start (EV_A_ (W)w, ++checkcnt);
2700 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2701 checks [checkcnt - 1] = w;
2702
2703 EV_FREQUENT_CHECK;
2704 }
2705
2706 void
2707 ev_check_stop (EV_P_ ev_check *w)
2708 {
2709 clear_pending (EV_A_ (W)w);
2710 if (expect_false (!ev_is_active (w)))
2711 return;
2712
2713 EV_FREQUENT_CHECK;
2714
2715 {
2716 int active = ev_active (w);
2717
2718 checks [active - 1] = checks [--checkcnt];
2719 ev_active (checks [active - 1]) = active;
2720 }
2721
2722 ev_stop (EV_A_ (W)w);
2723
2724 EV_FREQUENT_CHECK;
2725 }
2726
2727 #if EV_EMBED_ENABLE
2728 void noinline
2729 ev_embed_sweep (EV_P_ ev_embed *w)
2730 {
2731 ev_loop (w->other, EVLOOP_NONBLOCK);
2732 }
2733
2734 static void
2735 embed_io_cb (EV_P_ ev_io *io, int revents)
2736 {
2737 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2738
2739 if (ev_cb (w))
2740 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2741 else
2742 ev_loop (w->other, EVLOOP_NONBLOCK);
2743 }
2744
2745 static void
2746 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2747 {
2748 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2749
2750 {
2751 struct ev_loop *loop = w->other;
2752
2753 while (fdchangecnt)
2754 {
2755 fd_reify (EV_A);
2756 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2757 }
2758 }
2759 }
2760
2761 #if 0
2762 static void
2763 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2764 {
2765 ev_idle_stop (EV_A_ idle);
2766 }
2767 #endif
2768
2769 void
2770 ev_embed_start (EV_P_ ev_embed *w)
2771 {
2772 if (expect_false (ev_is_active (w)))
2773 return;
2774
2775 {
2776 struct ev_loop *loop = w->other;
2777 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2778 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2779 }
2780
2781 EV_FREQUENT_CHECK;
2782
2783 ev_set_priority (&w->io, ev_priority (w));
2784 ev_io_start (EV_A_ &w->io);
2785
2786 ev_prepare_init (&w->prepare, embed_prepare_cb);
2787 ev_set_priority (&w->prepare, EV_MINPRI);
2788 ev_prepare_start (EV_A_ &w->prepare);
2789
2790 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2791
2792 ev_start (EV_A_ (W)w, 1);
2793
2794 EV_FREQUENT_CHECK;
2795 }
2796
2797 void
2798 ev_embed_stop (EV_P_ ev_embed *w)
2799 {
2800 clear_pending (EV_A_ (W)w);
2801 if (expect_false (!ev_is_active (w)))
2802 return;
2803
2804 EV_FREQUENT_CHECK;
2805
2806 ev_io_stop (EV_A_ &w->io);
2807 ev_prepare_stop (EV_A_ &w->prepare);
2808
2809 ev_stop (EV_A_ (W)w);
2810
2811 EV_FREQUENT_CHECK;
2812 }
2813 #endif
2814
2815 #if EV_FORK_ENABLE
2816 void
2817 ev_fork_start (EV_P_ ev_fork *w)
2818 {
2819 if (expect_false (ev_is_active (w)))
2820 return;
2821
2822 EV_FREQUENT_CHECK;
2823
2824 ev_start (EV_A_ (W)w, ++forkcnt);
2825 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2826 forks [forkcnt - 1] = w;
2827
2828 EV_FREQUENT_CHECK;
2829 }
2830
2831 void
2832 ev_fork_stop (EV_P_ ev_fork *w)
2833 {
2834 clear_pending (EV_A_ (W)w);
2835 if (expect_false (!ev_is_active (w)))
2836 return;
2837
2838 EV_FREQUENT_CHECK;
2839
2840 {
2841 int active = ev_active (w);
2842
2843 forks [active - 1] = forks [--forkcnt];
2844 ev_active (forks [active - 1]) = active;
2845 }
2846
2847 ev_stop (EV_A_ (W)w);
2848
2849 EV_FREQUENT_CHECK;
2850 }
2851 #endif
2852
2853 #if EV_ASYNC_ENABLE
2854 void
2855 ev_async_start (EV_P_ ev_async *w)
2856 {
2857 if (expect_false (ev_is_active (w)))
2858 return;
2859
2860 evpipe_init (EV_A);
2861
2862 EV_FREQUENT_CHECK;
2863
2864 ev_start (EV_A_ (W)w, ++asynccnt);
2865 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2866 asyncs [asynccnt - 1] = w;
2867
2868 EV_FREQUENT_CHECK;
2869 }
2870
2871 void
2872 ev_async_stop (EV_P_ ev_async *w)
2873 {
2874 clear_pending (EV_A_ (W)w);
2875 if (expect_false (!ev_is_active (w)))
2876 return;
2877
2878 EV_FREQUENT_CHECK;
2879
2880 {
2881 int active = ev_active (w);
2882
2883 asyncs [active - 1] = asyncs [--asynccnt];
2884 ev_active (asyncs [active - 1]) = active;
2885 }
2886
2887 ev_stop (EV_A_ (W)w);
2888
2889 EV_FREQUENT_CHECK;
2890 }
2891
2892 void
2893 ev_async_send (EV_P_ ev_async *w)
2894 {
2895 w->sent = 1;
2896 evpipe_write (EV_A_ &gotasync);
2897 }
2898 #endif
2899
2900 /*****************************************************************************/
2901
2902 struct ev_once
2903 {
2904 ev_io io;
2905 ev_timer to;
2906 void (*cb)(int revents, void *arg);
2907 void *arg;
2908 };
2909
2910 static void
2911 once_cb (EV_P_ struct ev_once *once, int revents)
2912 {
2913 void (*cb)(int revents, void *arg) = once->cb;
2914 void *arg = once->arg;
2915
2916 ev_io_stop (EV_A_ &once->io);
2917 ev_timer_stop (EV_A_ &once->to);
2918 ev_free (once);
2919
2920 cb (revents, arg);
2921 }
2922
2923 static void
2924 once_cb_io (EV_P_ ev_io *w, int revents)
2925 {
2926 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2927 }
2928
2929 static void
2930 once_cb_to (EV_P_ ev_timer *w, int revents)
2931 {
2932 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2933 }
2934
2935 void
2936 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2937 {
2938 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2939
2940 if (expect_false (!once))
2941 {
2942 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2943 return;
2944 }
2945
2946 once->cb = cb;
2947 once->arg = arg;
2948
2949 ev_init (&once->io, once_cb_io);
2950 if (fd >= 0)
2951 {
2952 ev_io_set (&once->io, fd, events);
2953 ev_io_start (EV_A_ &once->io);
2954 }
2955
2956 ev_init (&once->to, once_cb_to);
2957 if (timeout >= 0.)
2958 {
2959 ev_timer_set (&once->to, timeout, 0.);
2960 ev_timer_start (EV_A_ &once->to);
2961 }
2962 }
2963
2964 #if EV_MULTIPLICITY
2965 #include "ev_wrap.h"
2966 #endif
2967
2968 #ifdef __cplusplus
2969 }
2970 #endif
2971