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Revision: 1.255
Committed: Mon Jun 9 14:11:30 2008 UTC (16 years, 1 month ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: rel-3_42
Changes since 1.254: +6 -0 lines
Log Message:
*** empty log message ***

File Contents

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