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Revision: 1.256
Committed: Thu Jun 19 06:53:49 2008 UTC (16 years, 1 month ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.255: +1 -0 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 # include <io.h>
160 # define WIN32_LEAN_AND_MEAN
161 # include <windows.h>
162 # ifndef EV_SELECT_IS_WINSOCKET
163 # define EV_SELECT_IS_WINSOCKET 1
164 # endif
165 #endif
166
167 /* this block tries to deduce configuration from header-defined symbols and defaults */
168
169 #ifndef EV_USE_MONOTONIC
170 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
171 # define EV_USE_MONOTONIC 1
172 # else
173 # define EV_USE_MONOTONIC 0
174 # endif
175 #endif
176
177 #ifndef EV_USE_REALTIME
178 # define EV_USE_REALTIME 0
179 #endif
180
181 #ifndef EV_USE_NANOSLEEP
182 # if _POSIX_C_SOURCE >= 199309L
183 # define EV_USE_NANOSLEEP 1
184 # else
185 # define EV_USE_NANOSLEEP 0
186 # endif
187 #endif
188
189 #ifndef EV_USE_SELECT
190 # define EV_USE_SELECT 1
191 #endif
192
193 #ifndef EV_USE_POLL
194 # ifdef _WIN32
195 # define EV_USE_POLL 0
196 # else
197 # define EV_USE_POLL 1
198 # endif
199 #endif
200
201 #ifndef EV_USE_EPOLL
202 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
203 # define EV_USE_EPOLL 1
204 # else
205 # define EV_USE_EPOLL 0
206 # endif
207 #endif
208
209 #ifndef EV_USE_KQUEUE
210 # define EV_USE_KQUEUE 0
211 #endif
212
213 #ifndef EV_USE_PORT
214 # define EV_USE_PORT 0
215 #endif
216
217 #ifndef EV_USE_INOTIFY
218 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
219 # define EV_USE_INOTIFY 1
220 # else
221 # define EV_USE_INOTIFY 0
222 # endif
223 #endif
224
225 #ifndef EV_PID_HASHSIZE
226 # if EV_MINIMAL
227 # define EV_PID_HASHSIZE 1
228 # else
229 # define EV_PID_HASHSIZE 16
230 # endif
231 #endif
232
233 #ifndef EV_INOTIFY_HASHSIZE
234 # if EV_MINIMAL
235 # define EV_INOTIFY_HASHSIZE 1
236 # else
237 # define EV_INOTIFY_HASHSIZE 16
238 # endif
239 #endif
240
241 #ifndef EV_USE_EVENTFD
242 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
243 # define EV_USE_EVENTFD 1
244 # else
245 # define EV_USE_EVENTFD 0
246 # endif
247 #endif
248
249 #if 0 /* debugging */
250 # define EV_VERIFY 3
251 # define EV_USE_4HEAP 1
252 # define EV_HEAP_CACHE_AT 1
253 #endif
254
255 #ifndef EV_VERIFY
256 # define EV_VERIFY !EV_MINIMAL
257 #endif
258
259 #ifndef EV_USE_4HEAP
260 # define EV_USE_4HEAP !EV_MINIMAL
261 #endif
262
263 #ifndef EV_HEAP_CACHE_AT
264 # define EV_HEAP_CACHE_AT !EV_MINIMAL
265 #endif
266
267 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
268
269 #ifndef CLOCK_MONOTONIC
270 # undef EV_USE_MONOTONIC
271 # define EV_USE_MONOTONIC 0
272 #endif
273
274 #ifndef CLOCK_REALTIME
275 # undef EV_USE_REALTIME
276 # define EV_USE_REALTIME 0
277 #endif
278
279 #if !EV_STAT_ENABLE
280 # undef EV_USE_INOTIFY
281 # define EV_USE_INOTIFY 0
282 #endif
283
284 #if !EV_USE_NANOSLEEP
285 # ifndef _WIN32
286 # include <sys/select.h>
287 # endif
288 #endif
289
290 #if EV_USE_INOTIFY
291 # include <sys/inotify.h>
292 #endif
293
294 #if EV_SELECT_IS_WINSOCKET
295 # include <winsock.h>
296 #endif
297
298 #if EV_USE_EVENTFD
299 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
300 # include <stdint.h>
301 # ifdef __cplusplus
302 extern "C" {
303 # endif
304 int eventfd (unsigned int initval, int flags);
305 # ifdef __cplusplus
306 }
307 # endif
308 #endif
309
310 /**/
311
312 #if EV_VERIFY >= 3
313 # define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
314 #else
315 # define EV_FREQUENT_CHECK do { } while (0)
316 #endif
317
318 /*
319 * This is used to avoid floating point rounding problems.
320 * It is added to ev_rt_now when scheduling periodics
321 * to ensure progress, time-wise, even when rounding
322 * errors are against us.
323 * This value is good at least till the year 4000.
324 * Better solutions welcome.
325 */
326 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
327
328 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
329 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
330 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
331
332 #if __GNUC__ >= 4
333 # define expect(expr,value) __builtin_expect ((expr),(value))
334 # define noinline __attribute__ ((noinline))
335 #else
336 # define expect(expr,value) (expr)
337 # define noinline
338 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
339 # define inline
340 # endif
341 #endif
342
343 #define expect_false(expr) expect ((expr) != 0, 0)
344 #define expect_true(expr) expect ((expr) != 0, 1)
345 #define inline_size static inline
346
347 #if EV_MINIMAL
348 # define inline_speed static noinline
349 #else
350 # define inline_speed static inline
351 #endif
352
353 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
354 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
355
356 #define EMPTY /* required for microsofts broken pseudo-c compiler */
357 #define EMPTY2(a,b) /* used to suppress some warnings */
358
359 typedef ev_watcher *W;
360 typedef ev_watcher_list *WL;
361 typedef ev_watcher_time *WT;
362
363 #define ev_active(w) ((W)(w))->active
364 #define ev_at(w) ((WT)(w))->at
365
366 #if EV_USE_MONOTONIC
367 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
368 /* giving it a reasonably high chance of working on typical architetcures */
369 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
370 #endif
371
372 #ifdef _WIN32
373 # include "ev_win32.c"
374 #endif
375
376 /*****************************************************************************/
377
378 static void (*syserr_cb)(const char *msg);
379
380 void
381 ev_set_syserr_cb (void (*cb)(const char *msg))
382 {
383 syserr_cb = cb;
384 }
385
386 static void noinline
387 syserr (const char *msg)
388 {
389 if (!msg)
390 msg = "(libev) system error";
391
392 if (syserr_cb)
393 syserr_cb (msg);
394 else
395 {
396 perror (msg);
397 abort ();
398 }
399 }
400
401 static void *
402 ev_realloc_emul (void *ptr, long size)
403 {
404 /* some systems, notably openbsd and darwin, fail to properly
405 * implement realloc (x, 0) (as required by both ansi c-98 and
406 * the single unix specification, so work around them here.
407 */
408
409 if (size)
410 return realloc (ptr, size);
411
412 free (ptr);
413 return 0;
414 }
415
416 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
417
418 void
419 ev_set_allocator (void *(*cb)(void *ptr, long size))
420 {
421 alloc = cb;
422 }
423
424 inline_speed void *
425 ev_realloc (void *ptr, long size)
426 {
427 ptr = alloc (ptr, size);
428
429 if (!ptr && size)
430 {
431 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
432 abort ();
433 }
434
435 return ptr;
436 }
437
438 #define ev_malloc(size) ev_realloc (0, (size))
439 #define ev_free(ptr) ev_realloc ((ptr), 0)
440
441 /*****************************************************************************/
442
443 typedef struct
444 {
445 WL head;
446 unsigned char events;
447 unsigned char reify;
448 #if EV_SELECT_IS_WINSOCKET
449 SOCKET handle;
450 #endif
451 } ANFD;
452
453 typedef struct
454 {
455 W w;
456 int events;
457 } ANPENDING;
458
459 #if EV_USE_INOTIFY
460 /* hash table entry per inotify-id */
461 typedef struct
462 {
463 WL head;
464 } ANFS;
465 #endif
466
467 /* Heap Entry */
468 #if EV_HEAP_CACHE_AT
469 typedef struct {
470 ev_tstamp at;
471 WT w;
472 } ANHE;
473
474 #define ANHE_w(he) (he).w /* access watcher, read-write */
475 #define ANHE_at(he) (he).at /* access cached at, read-only */
476 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
477 #else
478 typedef WT ANHE;
479
480 #define ANHE_w(he) (he)
481 #define ANHE_at(he) (he)->at
482 #define ANHE_at_cache(he)
483 #endif
484
485 #if EV_MULTIPLICITY
486
487 struct ev_loop
488 {
489 ev_tstamp ev_rt_now;
490 #define ev_rt_now ((loop)->ev_rt_now)
491 #define VAR(name,decl) decl;
492 #include "ev_vars.h"
493 #undef VAR
494 };
495 #include "ev_wrap.h"
496
497 static struct ev_loop default_loop_struct;
498 struct ev_loop *ev_default_loop_ptr;
499
500 #else
501
502 ev_tstamp ev_rt_now;
503 #define VAR(name,decl) static decl;
504 #include "ev_vars.h"
505 #undef VAR
506
507 static int ev_default_loop_ptr;
508
509 #endif
510
511 /*****************************************************************************/
512
513 ev_tstamp
514 ev_time (void)
515 {
516 #if EV_USE_REALTIME
517 struct timespec ts;
518 clock_gettime (CLOCK_REALTIME, &ts);
519 return ts.tv_sec + ts.tv_nsec * 1e-9;
520 #else
521 struct timeval tv;
522 gettimeofday (&tv, 0);
523 return tv.tv_sec + tv.tv_usec * 1e-6;
524 #endif
525 }
526
527 ev_tstamp inline_size
528 get_clock (void)
529 {
530 #if EV_USE_MONOTONIC
531 if (expect_true (have_monotonic))
532 {
533 struct timespec ts;
534 clock_gettime (CLOCK_MONOTONIC, &ts);
535 return ts.tv_sec + ts.tv_nsec * 1e-9;
536 }
537 #endif
538
539 return ev_time ();
540 }
541
542 #if EV_MULTIPLICITY
543 ev_tstamp
544 ev_now (EV_P)
545 {
546 return ev_rt_now;
547 }
548 #endif
549
550 void
551 ev_sleep (ev_tstamp delay)
552 {
553 if (delay > 0.)
554 {
555 #if EV_USE_NANOSLEEP
556 struct timespec ts;
557
558 ts.tv_sec = (time_t)delay;
559 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
560
561 nanosleep (&ts, 0);
562 #elif defined(_WIN32)
563 Sleep ((unsigned long)(delay * 1e3));
564 #else
565 struct timeval tv;
566
567 tv.tv_sec = (time_t)delay;
568 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
569
570 select (0, 0, 0, 0, &tv);
571 #endif
572 }
573 }
574
575 /*****************************************************************************/
576
577 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
578
579 int inline_size
580 array_nextsize (int elem, int cur, int cnt)
581 {
582 int ncur = cur + 1;
583
584 do
585 ncur <<= 1;
586 while (cnt > ncur);
587
588 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
589 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
590 {
591 ncur *= elem;
592 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
593 ncur = ncur - sizeof (void *) * 4;
594 ncur /= elem;
595 }
596
597 return ncur;
598 }
599
600 static noinline void *
601 array_realloc (int elem, void *base, int *cur, int cnt)
602 {
603 *cur = array_nextsize (elem, *cur, cnt);
604 return ev_realloc (base, elem * *cur);
605 }
606
607 #define array_needsize(type,base,cur,cnt,init) \
608 if (expect_false ((cnt) > (cur))) \
609 { \
610 int ocur_ = (cur); \
611 (base) = (type *)array_realloc \
612 (sizeof (type), (base), &(cur), (cnt)); \
613 init ((base) + (ocur_), (cur) - ocur_); \
614 }
615
616 #if 0
617 #define array_slim(type,stem) \
618 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
619 { \
620 stem ## max = array_roundsize (stem ## cnt >> 1); \
621 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
622 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
623 }
624 #endif
625
626 #define array_free(stem, idx) \
627 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
628
629 /*****************************************************************************/
630
631 void noinline
632 ev_feed_event (EV_P_ void *w, int revents)
633 {
634 W w_ = (W)w;
635 int pri = ABSPRI (w_);
636
637 if (expect_false (w_->pending))
638 pendings [pri][w_->pending - 1].events |= revents;
639 else
640 {
641 w_->pending = ++pendingcnt [pri];
642 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
643 pendings [pri][w_->pending - 1].w = w_;
644 pendings [pri][w_->pending - 1].events = revents;
645 }
646 }
647
648 void inline_speed
649 queue_events (EV_P_ W *events, int eventcnt, int type)
650 {
651 int i;
652
653 for (i = 0; i < eventcnt; ++i)
654 ev_feed_event (EV_A_ events [i], type);
655 }
656
657 /*****************************************************************************/
658
659 void inline_size
660 anfds_init (ANFD *base, int count)
661 {
662 while (count--)
663 {
664 base->head = 0;
665 base->events = EV_NONE;
666 base->reify = 0;
667
668 ++base;
669 }
670 }
671
672 void inline_speed
673 fd_event (EV_P_ int fd, int revents)
674 {
675 ANFD *anfd = anfds + fd;
676 ev_io *w;
677
678 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
679 {
680 int ev = w->events & revents;
681
682 if (ev)
683 ev_feed_event (EV_A_ (W)w, ev);
684 }
685 }
686
687 void
688 ev_feed_fd_event (EV_P_ int fd, int revents)
689 {
690 if (fd >= 0 && fd < anfdmax)
691 fd_event (EV_A_ fd, revents);
692 }
693
694 void inline_size
695 fd_reify (EV_P)
696 {
697 int i;
698
699 for (i = 0; i < fdchangecnt; ++i)
700 {
701 int fd = fdchanges [i];
702 ANFD *anfd = anfds + fd;
703 ev_io *w;
704
705 unsigned char events = 0;
706
707 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
708 events |= (unsigned char)w->events;
709
710 #if EV_SELECT_IS_WINSOCKET
711 if (events)
712 {
713 unsigned long arg;
714 #ifdef EV_FD_TO_WIN32_HANDLE
715 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
716 #else
717 anfd->handle = _get_osfhandle (fd);
718 #endif
719 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
720 }
721 #endif
722
723 {
724 unsigned char o_events = anfd->events;
725 unsigned char o_reify = anfd->reify;
726
727 anfd->reify = 0;
728 anfd->events = events;
729
730 if (o_events != events || o_reify & EV_IOFDSET)
731 backend_modify (EV_A_ fd, o_events, events);
732 }
733 }
734
735 fdchangecnt = 0;
736 }
737
738 void inline_size
739 fd_change (EV_P_ int fd, int flags)
740 {
741 unsigned char reify = anfds [fd].reify;
742 anfds [fd].reify |= flags;
743
744 if (expect_true (!reify))
745 {
746 ++fdchangecnt;
747 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
748 fdchanges [fdchangecnt - 1] = fd;
749 }
750 }
751
752 void inline_speed
753 fd_kill (EV_P_ int fd)
754 {
755 ev_io *w;
756
757 while ((w = (ev_io *)anfds [fd].head))
758 {
759 ev_io_stop (EV_A_ w);
760 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
761 }
762 }
763
764 int inline_size
765 fd_valid (int fd)
766 {
767 #ifdef _WIN32
768 return _get_osfhandle (fd) != -1;
769 #else
770 return fcntl (fd, F_GETFD) != -1;
771 #endif
772 }
773
774 /* called on EBADF to verify fds */
775 static void noinline
776 fd_ebadf (EV_P)
777 {
778 int fd;
779
780 for (fd = 0; fd < anfdmax; ++fd)
781 if (anfds [fd].events)
782 if (!fd_valid (fd) && errno == EBADF)
783 fd_kill (EV_A_ fd);
784 }
785
786 /* called on ENOMEM in select/poll to kill some fds and retry */
787 static void noinline
788 fd_enomem (EV_P)
789 {
790 int fd;
791
792 for (fd = anfdmax; fd--; )
793 if (anfds [fd].events)
794 {
795 fd_kill (EV_A_ fd);
796 return;
797 }
798 }
799
800 /* usually called after fork if backend needs to re-arm all fds from scratch */
801 static void noinline
802 fd_rearm_all (EV_P)
803 {
804 int fd;
805
806 for (fd = 0; fd < anfdmax; ++fd)
807 if (anfds [fd].events)
808 {
809 anfds [fd].events = 0;
810 fd_change (EV_A_ fd, EV_IOFDSET | 1);
811 }
812 }
813
814 /*****************************************************************************/
815
816 /*
817 * the heap functions want a real array index. array index 0 uis guaranteed to not
818 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
819 * the branching factor of the d-tree.
820 */
821
822 /*
823 * at the moment we allow libev the luxury of two heaps,
824 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
825 * which is more cache-efficient.
826 * the difference is about 5% with 50000+ watchers.
827 */
828 #if EV_USE_4HEAP
829
830 #define DHEAP 4
831 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
832 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
833 #define UPHEAP_DONE(p,k) ((p) == (k))
834
835 /* away from the root */
836 void inline_speed
837 downheap (ANHE *heap, int N, int k)
838 {
839 ANHE he = heap [k];
840 ANHE *E = heap + N + HEAP0;
841
842 for (;;)
843 {
844 ev_tstamp minat;
845 ANHE *minpos;
846 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
847
848 /* find minimum child */
849 if (expect_true (pos + DHEAP - 1 < E))
850 {
851 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
852 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
853 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
854 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
855 }
856 else if (pos < E)
857 {
858 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
859 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
860 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
861 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
862 }
863 else
864 break;
865
866 if (ANHE_at (he) <= minat)
867 break;
868
869 heap [k] = *minpos;
870 ev_active (ANHE_w (*minpos)) = k;
871
872 k = minpos - heap;
873 }
874
875 heap [k] = he;
876 ev_active (ANHE_w (he)) = k;
877 }
878
879 #else /* 4HEAP */
880
881 #define HEAP0 1
882 #define HPARENT(k) ((k) >> 1)
883 #define UPHEAP_DONE(p,k) (!(p))
884
885 /* away from the root */
886 void inline_speed
887 downheap (ANHE *heap, int N, int k)
888 {
889 ANHE he = heap [k];
890
891 for (;;)
892 {
893 int c = k << 1;
894
895 if (c > N + HEAP0 - 1)
896 break;
897
898 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
899 ? 1 : 0;
900
901 if (ANHE_at (he) <= ANHE_at (heap [c]))
902 break;
903
904 heap [k] = heap [c];
905 ev_active (ANHE_w (heap [k])) = k;
906
907 k = c;
908 }
909
910 heap [k] = he;
911 ev_active (ANHE_w (he)) = k;
912 }
913 #endif
914
915 /* towards the root */
916 void inline_speed
917 upheap (ANHE *heap, int k)
918 {
919 ANHE he = heap [k];
920
921 for (;;)
922 {
923 int p = HPARENT (k);
924
925 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
926 break;
927
928 heap [k] = heap [p];
929 ev_active (ANHE_w (heap [k])) = k;
930 k = p;
931 }
932
933 heap [k] = he;
934 ev_active (ANHE_w (he)) = k;
935 }
936
937 void inline_size
938 adjustheap (ANHE *heap, int N, int k)
939 {
940 if (k > HEAP0 && ANHE_at (heap [HPARENT (k)]) >= ANHE_at (heap [k]))
941 upheap (heap, k);
942 else
943 downheap (heap, N, k);
944 }
945
946 /* rebuild the heap: this function is used only once and executed rarely */
947 void inline_size
948 reheap (ANHE *heap, int N)
949 {
950 int i;
951
952 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
953 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
954 for (i = 0; i < N; ++i)
955 upheap (heap, i + HEAP0);
956 }
957
958 /*****************************************************************************/
959
960 typedef struct
961 {
962 WL head;
963 EV_ATOMIC_T gotsig;
964 } ANSIG;
965
966 static ANSIG *signals;
967 static int signalmax;
968
969 static EV_ATOMIC_T gotsig;
970
971 void inline_size
972 signals_init (ANSIG *base, int count)
973 {
974 while (count--)
975 {
976 base->head = 0;
977 base->gotsig = 0;
978
979 ++base;
980 }
981 }
982
983 /*****************************************************************************/
984
985 void inline_speed
986 fd_intern (int fd)
987 {
988 #ifdef _WIN32
989 unsigned long arg = 1;
990 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
991 #else
992 fcntl (fd, F_SETFD, FD_CLOEXEC);
993 fcntl (fd, F_SETFL, O_NONBLOCK);
994 #endif
995 }
996
997 static void noinline
998 evpipe_init (EV_P)
999 {
1000 if (!ev_is_active (&pipeev))
1001 {
1002 #if EV_USE_EVENTFD
1003 if ((evfd = eventfd (0, 0)) >= 0)
1004 {
1005 evpipe [0] = -1;
1006 fd_intern (evfd);
1007 ev_io_set (&pipeev, evfd, EV_READ);
1008 }
1009 else
1010 #endif
1011 {
1012 while (pipe (evpipe))
1013 syserr ("(libev) error creating signal/async pipe");
1014
1015 fd_intern (evpipe [0]);
1016 fd_intern (evpipe [1]);
1017 ev_io_set (&pipeev, evpipe [0], EV_READ);
1018 }
1019
1020 ev_io_start (EV_A_ &pipeev);
1021 ev_unref (EV_A); /* watcher should not keep loop alive */
1022 }
1023 }
1024
1025 void inline_size
1026 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1027 {
1028 if (!*flag)
1029 {
1030 int old_errno = errno; /* save errno because write might clobber it */
1031
1032 *flag = 1;
1033
1034 #if EV_USE_EVENTFD
1035 if (evfd >= 0)
1036 {
1037 uint64_t counter = 1;
1038 write (evfd, &counter, sizeof (uint64_t));
1039 }
1040 else
1041 #endif
1042 write (evpipe [1], &old_errno, 1);
1043
1044 errno = old_errno;
1045 }
1046 }
1047
1048 static void
1049 pipecb (EV_P_ ev_io *iow, int revents)
1050 {
1051 #if EV_USE_EVENTFD
1052 if (evfd >= 0)
1053 {
1054 uint64_t counter;
1055 read (evfd, &counter, sizeof (uint64_t));
1056 }
1057 else
1058 #endif
1059 {
1060 char dummy;
1061 read (evpipe [0], &dummy, 1);
1062 }
1063
1064 if (gotsig && ev_is_default_loop (EV_A))
1065 {
1066 int signum;
1067 gotsig = 0;
1068
1069 for (signum = signalmax; signum--; )
1070 if (signals [signum].gotsig)
1071 ev_feed_signal_event (EV_A_ signum + 1);
1072 }
1073
1074 #if EV_ASYNC_ENABLE
1075 if (gotasync)
1076 {
1077 int i;
1078 gotasync = 0;
1079
1080 for (i = asynccnt; i--; )
1081 if (asyncs [i]->sent)
1082 {
1083 asyncs [i]->sent = 0;
1084 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1085 }
1086 }
1087 #endif
1088 }
1089
1090 /*****************************************************************************/
1091
1092 static void
1093 ev_sighandler (int signum)
1094 {
1095 #if EV_MULTIPLICITY
1096 struct ev_loop *loop = &default_loop_struct;
1097 #endif
1098
1099 #if _WIN32
1100 signal (signum, ev_sighandler);
1101 #endif
1102
1103 signals [signum - 1].gotsig = 1;
1104 evpipe_write (EV_A_ &gotsig);
1105 }
1106
1107 void noinline
1108 ev_feed_signal_event (EV_P_ int signum)
1109 {
1110 WL w;
1111
1112 #if EV_MULTIPLICITY
1113 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1114 #endif
1115
1116 --signum;
1117
1118 if (signum < 0 || signum >= signalmax)
1119 return;
1120
1121 signals [signum].gotsig = 0;
1122
1123 for (w = signals [signum].head; w; w = w->next)
1124 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1125 }
1126
1127 /*****************************************************************************/
1128
1129 static WL childs [EV_PID_HASHSIZE];
1130
1131 #ifndef _WIN32
1132
1133 static ev_signal childev;
1134
1135 #ifndef WIFCONTINUED
1136 # define WIFCONTINUED(status) 0
1137 #endif
1138
1139 void inline_speed
1140 child_reap (EV_P_ int chain, int pid, int status)
1141 {
1142 ev_child *w;
1143 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1144
1145 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1146 {
1147 if ((w->pid == pid || !w->pid)
1148 && (!traced || (w->flags & 1)))
1149 {
1150 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1151 w->rpid = pid;
1152 w->rstatus = status;
1153 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1154 }
1155 }
1156 }
1157
1158 #ifndef WCONTINUED
1159 # define WCONTINUED 0
1160 #endif
1161
1162 static void
1163 childcb (EV_P_ ev_signal *sw, int revents)
1164 {
1165 int pid, status;
1166
1167 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1168 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1169 if (!WCONTINUED
1170 || errno != EINVAL
1171 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1172 return;
1173
1174 /* make sure we are called again until all children have been reaped */
1175 /* we need to do it this way so that the callback gets called before we continue */
1176 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1177
1178 child_reap (EV_A_ pid, pid, status);
1179 if (EV_PID_HASHSIZE > 1)
1180 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1181 }
1182
1183 #endif
1184
1185 /*****************************************************************************/
1186
1187 #if EV_USE_PORT
1188 # include "ev_port.c"
1189 #endif
1190 #if EV_USE_KQUEUE
1191 # include "ev_kqueue.c"
1192 #endif
1193 #if EV_USE_EPOLL
1194 # include "ev_epoll.c"
1195 #endif
1196 #if EV_USE_POLL
1197 # include "ev_poll.c"
1198 #endif
1199 #if EV_USE_SELECT
1200 # include "ev_select.c"
1201 #endif
1202
1203 int
1204 ev_version_major (void)
1205 {
1206 return EV_VERSION_MAJOR;
1207 }
1208
1209 int
1210 ev_version_minor (void)
1211 {
1212 return EV_VERSION_MINOR;
1213 }
1214
1215 /* return true if we are running with elevated privileges and should ignore env variables */
1216 int inline_size
1217 enable_secure (void)
1218 {
1219 #ifdef _WIN32
1220 return 0;
1221 #else
1222 return getuid () != geteuid ()
1223 || getgid () != getegid ();
1224 #endif
1225 }
1226
1227 unsigned int
1228 ev_supported_backends (void)
1229 {
1230 unsigned int flags = 0;
1231
1232 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1233 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1234 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1235 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1236 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1237
1238 return flags;
1239 }
1240
1241 unsigned int
1242 ev_recommended_backends (void)
1243 {
1244 unsigned int flags = ev_supported_backends ();
1245
1246 #ifndef __NetBSD__
1247 /* kqueue is borked on everything but netbsd apparently */
1248 /* it usually doesn't work correctly on anything but sockets and pipes */
1249 flags &= ~EVBACKEND_KQUEUE;
1250 #endif
1251 #ifdef __APPLE__
1252 // flags &= ~EVBACKEND_KQUEUE; for documentation
1253 flags &= ~EVBACKEND_POLL;
1254 #endif
1255
1256 return flags;
1257 }
1258
1259 unsigned int
1260 ev_embeddable_backends (void)
1261 {
1262 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1263
1264 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1265 /* please fix it and tell me how to detect the fix */
1266 flags &= ~EVBACKEND_EPOLL;
1267
1268 return flags;
1269 }
1270
1271 unsigned int
1272 ev_backend (EV_P)
1273 {
1274 return backend;
1275 }
1276
1277 unsigned int
1278 ev_loop_count (EV_P)
1279 {
1280 return loop_count;
1281 }
1282
1283 void
1284 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1285 {
1286 io_blocktime = interval;
1287 }
1288
1289 void
1290 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1291 {
1292 timeout_blocktime = interval;
1293 }
1294
1295 static void noinline
1296 loop_init (EV_P_ unsigned int flags)
1297 {
1298 if (!backend)
1299 {
1300 #if EV_USE_MONOTONIC
1301 {
1302 struct timespec ts;
1303 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1304 have_monotonic = 1;
1305 }
1306 #endif
1307
1308 ev_rt_now = ev_time ();
1309 mn_now = get_clock ();
1310 now_floor = mn_now;
1311 rtmn_diff = ev_rt_now - mn_now;
1312
1313 io_blocktime = 0.;
1314 timeout_blocktime = 0.;
1315 backend = 0;
1316 backend_fd = -1;
1317 gotasync = 0;
1318 #if EV_USE_INOTIFY
1319 fs_fd = -2;
1320 #endif
1321
1322 /* pid check not overridable via env */
1323 #ifndef _WIN32
1324 if (flags & EVFLAG_FORKCHECK)
1325 curpid = getpid ();
1326 #endif
1327
1328 if (!(flags & EVFLAG_NOENV)
1329 && !enable_secure ()
1330 && getenv ("LIBEV_FLAGS"))
1331 flags = atoi (getenv ("LIBEV_FLAGS"));
1332
1333 if (!(flags & 0x0000ffffU))
1334 flags |= ev_recommended_backends ();
1335
1336 #if EV_USE_PORT
1337 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1338 #endif
1339 #if EV_USE_KQUEUE
1340 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1341 #endif
1342 #if EV_USE_EPOLL
1343 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1344 #endif
1345 #if EV_USE_POLL
1346 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1347 #endif
1348 #if EV_USE_SELECT
1349 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1350 #endif
1351
1352 ev_init (&pipeev, pipecb);
1353 ev_set_priority (&pipeev, EV_MAXPRI);
1354 }
1355 }
1356
1357 static void noinline
1358 loop_destroy (EV_P)
1359 {
1360 int i;
1361
1362 if (ev_is_active (&pipeev))
1363 {
1364 ev_ref (EV_A); /* signal watcher */
1365 ev_io_stop (EV_A_ &pipeev);
1366
1367 #if EV_USE_EVENTFD
1368 if (evfd >= 0)
1369 close (evfd);
1370 #endif
1371
1372 if (evpipe [0] >= 0)
1373 {
1374 close (evpipe [0]);
1375 close (evpipe [1]);
1376 }
1377 }
1378
1379 #if EV_USE_INOTIFY
1380 if (fs_fd >= 0)
1381 close (fs_fd);
1382 #endif
1383
1384 if (backend_fd >= 0)
1385 close (backend_fd);
1386
1387 #if EV_USE_PORT
1388 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1389 #endif
1390 #if EV_USE_KQUEUE
1391 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1392 #endif
1393 #if EV_USE_EPOLL
1394 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1395 #endif
1396 #if EV_USE_POLL
1397 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1398 #endif
1399 #if EV_USE_SELECT
1400 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1401 #endif
1402
1403 for (i = NUMPRI; i--; )
1404 {
1405 array_free (pending, [i]);
1406 #if EV_IDLE_ENABLE
1407 array_free (idle, [i]);
1408 #endif
1409 }
1410
1411 ev_free (anfds); anfdmax = 0;
1412
1413 /* have to use the microsoft-never-gets-it-right macro */
1414 array_free (fdchange, EMPTY);
1415 array_free (timer, EMPTY);
1416 #if EV_PERIODIC_ENABLE
1417 array_free (periodic, EMPTY);
1418 #endif
1419 #if EV_FORK_ENABLE
1420 array_free (fork, EMPTY);
1421 #endif
1422 array_free (prepare, EMPTY);
1423 array_free (check, EMPTY);
1424 #if EV_ASYNC_ENABLE
1425 array_free (async, EMPTY);
1426 #endif
1427
1428 backend = 0;
1429 }
1430
1431 #if EV_USE_INOTIFY
1432 void inline_size infy_fork (EV_P);
1433 #endif
1434
1435 void inline_size
1436 loop_fork (EV_P)
1437 {
1438 #if EV_USE_PORT
1439 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1440 #endif
1441 #if EV_USE_KQUEUE
1442 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1443 #endif
1444 #if EV_USE_EPOLL
1445 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1446 #endif
1447 #if EV_USE_INOTIFY
1448 infy_fork (EV_A);
1449 #endif
1450
1451 if (ev_is_active (&pipeev))
1452 {
1453 /* this "locks" the handlers against writing to the pipe */
1454 /* while we modify the fd vars */
1455 gotsig = 1;
1456 #if EV_ASYNC_ENABLE
1457 gotasync = 1;
1458 #endif
1459
1460 ev_ref (EV_A);
1461 ev_io_stop (EV_A_ &pipeev);
1462
1463 #if EV_USE_EVENTFD
1464 if (evfd >= 0)
1465 close (evfd);
1466 #endif
1467
1468 if (evpipe [0] >= 0)
1469 {
1470 close (evpipe [0]);
1471 close (evpipe [1]);
1472 }
1473
1474 evpipe_init (EV_A);
1475 /* now iterate over everything, in case we missed something */
1476 pipecb (EV_A_ &pipeev, EV_READ);
1477 }
1478
1479 postfork = 0;
1480 }
1481
1482 #if EV_MULTIPLICITY
1483
1484 struct ev_loop *
1485 ev_loop_new (unsigned int flags)
1486 {
1487 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1488
1489 memset (loop, 0, sizeof (struct ev_loop));
1490
1491 loop_init (EV_A_ flags);
1492
1493 if (ev_backend (EV_A))
1494 return loop;
1495
1496 return 0;
1497 }
1498
1499 void
1500 ev_loop_destroy (EV_P)
1501 {
1502 loop_destroy (EV_A);
1503 ev_free (loop);
1504 }
1505
1506 void
1507 ev_loop_fork (EV_P)
1508 {
1509 postfork = 1; /* must be in line with ev_default_fork */
1510 }
1511
1512 #if EV_VERIFY
1513 void noinline
1514 verify_watcher (EV_P_ W w)
1515 {
1516 assert (("watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1517
1518 if (w->pending)
1519 assert (("pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1520 }
1521
1522 static void noinline
1523 verify_heap (EV_P_ ANHE *heap, int N)
1524 {
1525 int i;
1526
1527 for (i = HEAP0; i < N + HEAP0; ++i)
1528 {
1529 assert (("active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1530 assert (("heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1531 assert (("heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1532
1533 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1534 }
1535 }
1536
1537 static void noinline
1538 array_verify (EV_P_ W *ws, int cnt)
1539 {
1540 while (cnt--)
1541 {
1542 assert (("active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1543 verify_watcher (EV_A_ ws [cnt]);
1544 }
1545 }
1546 #endif
1547
1548 void
1549 ev_loop_verify (EV_P)
1550 {
1551 #if EV_VERIFY
1552 int i;
1553 WL w;
1554
1555 assert (activecnt >= -1);
1556
1557 assert (fdchangemax >= fdchangecnt);
1558 for (i = 0; i < fdchangecnt; ++i)
1559 assert (("negative fd in fdchanges", fdchanges [i] >= 0));
1560
1561 assert (anfdmax >= 0);
1562 for (i = 0; i < anfdmax; ++i)
1563 for (w = anfds [i].head; w; w = w->next)
1564 {
1565 verify_watcher (EV_A_ (W)w);
1566 assert (("inactive fd watcher on anfd list", ev_active (w) == 1));
1567 assert (("fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1568 }
1569
1570 assert (timermax >= timercnt);
1571 verify_heap (EV_A_ timers, timercnt);
1572
1573 #if EV_PERIODIC_ENABLE
1574 assert (periodicmax >= periodiccnt);
1575 verify_heap (EV_A_ periodics, periodiccnt);
1576 #endif
1577
1578 for (i = NUMPRI; i--; )
1579 {
1580 assert (pendingmax [i] >= pendingcnt [i]);
1581 #if EV_IDLE_ENABLE
1582 assert (idleall >= 0);
1583 assert (idlemax [i] >= idlecnt [i]);
1584 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1585 #endif
1586 }
1587
1588 #if EV_FORK_ENABLE
1589 assert (forkmax >= forkcnt);
1590 array_verify (EV_A_ (W *)forks, forkcnt);
1591 #endif
1592
1593 #if EV_ASYNC_ENABLE
1594 assert (asyncmax >= asynccnt);
1595 array_verify (EV_A_ (W *)asyncs, asynccnt);
1596 #endif
1597
1598 assert (preparemax >= preparecnt);
1599 array_verify (EV_A_ (W *)prepares, preparecnt);
1600
1601 assert (checkmax >= checkcnt);
1602 array_verify (EV_A_ (W *)checks, checkcnt);
1603
1604 # if 0
1605 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1606 for (signum = signalmax; signum--; ) if (signals [signum].gotsig)
1607 # endif
1608 #endif
1609 }
1610
1611 #endif /* multiplicity */
1612
1613 #if EV_MULTIPLICITY
1614 struct ev_loop *
1615 ev_default_loop_init (unsigned int flags)
1616 #else
1617 int
1618 ev_default_loop (unsigned int flags)
1619 #endif
1620 {
1621 if (!ev_default_loop_ptr)
1622 {
1623 #if EV_MULTIPLICITY
1624 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1625 #else
1626 ev_default_loop_ptr = 1;
1627 #endif
1628
1629 loop_init (EV_A_ flags);
1630
1631 if (ev_backend (EV_A))
1632 {
1633 #ifndef _WIN32
1634 ev_signal_init (&childev, childcb, SIGCHLD);
1635 ev_set_priority (&childev, EV_MAXPRI);
1636 ev_signal_start (EV_A_ &childev);
1637 ev_unref (EV_A); /* child watcher should not keep loop alive */
1638 #endif
1639 }
1640 else
1641 ev_default_loop_ptr = 0;
1642 }
1643
1644 return ev_default_loop_ptr;
1645 }
1646
1647 void
1648 ev_default_destroy (void)
1649 {
1650 #if EV_MULTIPLICITY
1651 struct ev_loop *loop = ev_default_loop_ptr;
1652 #endif
1653
1654 #ifndef _WIN32
1655 ev_ref (EV_A); /* child watcher */
1656 ev_signal_stop (EV_A_ &childev);
1657 #endif
1658
1659 loop_destroy (EV_A);
1660 }
1661
1662 void
1663 ev_default_fork (void)
1664 {
1665 #if EV_MULTIPLICITY
1666 struct ev_loop *loop = ev_default_loop_ptr;
1667 #endif
1668
1669 if (backend)
1670 postfork = 1; /* must be in line with ev_loop_fork */
1671 }
1672
1673 /*****************************************************************************/
1674
1675 void
1676 ev_invoke (EV_P_ void *w, int revents)
1677 {
1678 EV_CB_INVOKE ((W)w, revents);
1679 }
1680
1681 void inline_speed
1682 call_pending (EV_P)
1683 {
1684 int pri;
1685
1686 for (pri = NUMPRI; pri--; )
1687 while (pendingcnt [pri])
1688 {
1689 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1690
1691 if (expect_true (p->w))
1692 {
1693 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1694
1695 p->w->pending = 0;
1696 EV_CB_INVOKE (p->w, p->events);
1697 EV_FREQUENT_CHECK;
1698 }
1699 }
1700 }
1701
1702 #if EV_IDLE_ENABLE
1703 void inline_size
1704 idle_reify (EV_P)
1705 {
1706 if (expect_false (idleall))
1707 {
1708 int pri;
1709
1710 for (pri = NUMPRI; pri--; )
1711 {
1712 if (pendingcnt [pri])
1713 break;
1714
1715 if (idlecnt [pri])
1716 {
1717 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1718 break;
1719 }
1720 }
1721 }
1722 }
1723 #endif
1724
1725 void inline_size
1726 timers_reify (EV_P)
1727 {
1728 EV_FREQUENT_CHECK;
1729
1730 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
1731 {
1732 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
1733
1734 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1735
1736 /* first reschedule or stop timer */
1737 if (w->repeat)
1738 {
1739 ev_at (w) += w->repeat;
1740 if (ev_at (w) < mn_now)
1741 ev_at (w) = mn_now;
1742
1743 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1744
1745 ANHE_at_cache (timers [HEAP0]);
1746 downheap (timers, timercnt, HEAP0);
1747 }
1748 else
1749 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1750
1751 EV_FREQUENT_CHECK;
1752 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1753 }
1754 }
1755
1756 #if EV_PERIODIC_ENABLE
1757 void inline_size
1758 periodics_reify (EV_P)
1759 {
1760 EV_FREQUENT_CHECK;
1761
1762 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
1763 {
1764 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
1765
1766 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1767
1768 /* first reschedule or stop timer */
1769 if (w->reschedule_cb)
1770 {
1771 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1772
1773 assert (("ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
1774
1775 ANHE_at_cache (periodics [HEAP0]);
1776 downheap (periodics, periodiccnt, HEAP0);
1777 }
1778 else if (w->interval)
1779 {
1780 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1781 /* if next trigger time is not sufficiently in the future, put it there */
1782 /* this might happen because of floating point inexactness */
1783 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
1784 {
1785 ev_at (w) += w->interval;
1786
1787 /* if interval is unreasonably low we might still have a time in the past */
1788 /* so correct this. this will make the periodic very inexact, but the user */
1789 /* has effectively asked to get triggered more often than possible */
1790 if (ev_at (w) < ev_rt_now)
1791 ev_at (w) = ev_rt_now;
1792 }
1793
1794 ANHE_at_cache (periodics [HEAP0]);
1795 downheap (periodics, periodiccnt, HEAP0);
1796 }
1797 else
1798 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1799
1800 EV_FREQUENT_CHECK;
1801 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1802 }
1803 }
1804
1805 static void noinline
1806 periodics_reschedule (EV_P)
1807 {
1808 int i;
1809
1810 /* adjust periodics after time jump */
1811 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
1812 {
1813 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
1814
1815 if (w->reschedule_cb)
1816 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1817 else if (w->interval)
1818 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1819
1820 ANHE_at_cache (periodics [i]);
1821 }
1822
1823 reheap (periodics, periodiccnt);
1824 }
1825 #endif
1826
1827 void inline_speed
1828 time_update (EV_P_ ev_tstamp max_block)
1829 {
1830 int i;
1831
1832 #if EV_USE_MONOTONIC
1833 if (expect_true (have_monotonic))
1834 {
1835 ev_tstamp odiff = rtmn_diff;
1836
1837 mn_now = get_clock ();
1838
1839 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1840 /* interpolate in the meantime */
1841 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1842 {
1843 ev_rt_now = rtmn_diff + mn_now;
1844 return;
1845 }
1846
1847 now_floor = mn_now;
1848 ev_rt_now = ev_time ();
1849
1850 /* loop a few times, before making important decisions.
1851 * on the choice of "4": one iteration isn't enough,
1852 * in case we get preempted during the calls to
1853 * ev_time and get_clock. a second call is almost guaranteed
1854 * to succeed in that case, though. and looping a few more times
1855 * doesn't hurt either as we only do this on time-jumps or
1856 * in the unlikely event of having been preempted here.
1857 */
1858 for (i = 4; --i; )
1859 {
1860 rtmn_diff = ev_rt_now - mn_now;
1861
1862 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
1863 return; /* all is well */
1864
1865 ev_rt_now = ev_time ();
1866 mn_now = get_clock ();
1867 now_floor = mn_now;
1868 }
1869
1870 # if EV_PERIODIC_ENABLE
1871 periodics_reschedule (EV_A);
1872 # endif
1873 /* no timer adjustment, as the monotonic clock doesn't jump */
1874 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1875 }
1876 else
1877 #endif
1878 {
1879 ev_rt_now = ev_time ();
1880
1881 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1882 {
1883 #if EV_PERIODIC_ENABLE
1884 periodics_reschedule (EV_A);
1885 #endif
1886 /* adjust timers. this is easy, as the offset is the same for all of them */
1887 for (i = 0; i < timercnt; ++i)
1888 {
1889 ANHE *he = timers + i + HEAP0;
1890 ANHE_w (*he)->at += ev_rt_now - mn_now;
1891 ANHE_at_cache (*he);
1892 }
1893 }
1894
1895 mn_now = ev_rt_now;
1896 }
1897 }
1898
1899 void
1900 ev_ref (EV_P)
1901 {
1902 ++activecnt;
1903 }
1904
1905 void
1906 ev_unref (EV_P)
1907 {
1908 --activecnt;
1909 }
1910
1911 static int loop_done;
1912
1913 void
1914 ev_loop (EV_P_ int flags)
1915 {
1916 loop_done = EVUNLOOP_CANCEL;
1917
1918 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1919
1920 do
1921 {
1922 #if EV_VERIFY >= 2
1923 ev_loop_verify (EV_A);
1924 #endif
1925
1926 #ifndef _WIN32
1927 if (expect_false (curpid)) /* penalise the forking check even more */
1928 if (expect_false (getpid () != curpid))
1929 {
1930 curpid = getpid ();
1931 postfork = 1;
1932 }
1933 #endif
1934
1935 #if EV_FORK_ENABLE
1936 /* we might have forked, so queue fork handlers */
1937 if (expect_false (postfork))
1938 if (forkcnt)
1939 {
1940 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1941 call_pending (EV_A);
1942 }
1943 #endif
1944
1945 /* queue prepare watchers (and execute them) */
1946 if (expect_false (preparecnt))
1947 {
1948 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1949 call_pending (EV_A);
1950 }
1951
1952 if (expect_false (!activecnt))
1953 break;
1954
1955 /* we might have forked, so reify kernel state if necessary */
1956 if (expect_false (postfork))
1957 loop_fork (EV_A);
1958
1959 /* update fd-related kernel structures */
1960 fd_reify (EV_A);
1961
1962 /* calculate blocking time */
1963 {
1964 ev_tstamp waittime = 0.;
1965 ev_tstamp sleeptime = 0.;
1966
1967 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1968 {
1969 /* update time to cancel out callback processing overhead */
1970 time_update (EV_A_ 1e100);
1971
1972 waittime = MAX_BLOCKTIME;
1973
1974 if (timercnt)
1975 {
1976 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
1977 if (waittime > to) waittime = to;
1978 }
1979
1980 #if EV_PERIODIC_ENABLE
1981 if (periodiccnt)
1982 {
1983 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
1984 if (waittime > to) waittime = to;
1985 }
1986 #endif
1987
1988 if (expect_false (waittime < timeout_blocktime))
1989 waittime = timeout_blocktime;
1990
1991 sleeptime = waittime - backend_fudge;
1992
1993 if (expect_true (sleeptime > io_blocktime))
1994 sleeptime = io_blocktime;
1995
1996 if (sleeptime)
1997 {
1998 ev_sleep (sleeptime);
1999 waittime -= sleeptime;
2000 }
2001 }
2002
2003 ++loop_count;
2004 backend_poll (EV_A_ waittime);
2005
2006 /* update ev_rt_now, do magic */
2007 time_update (EV_A_ waittime + sleeptime);
2008 }
2009
2010 /* queue pending timers and reschedule them */
2011 timers_reify (EV_A); /* relative timers called last */
2012 #if EV_PERIODIC_ENABLE
2013 periodics_reify (EV_A); /* absolute timers called first */
2014 #endif
2015
2016 #if EV_IDLE_ENABLE
2017 /* queue idle watchers unless other events are pending */
2018 idle_reify (EV_A);
2019 #endif
2020
2021 /* queue check watchers, to be executed first */
2022 if (expect_false (checkcnt))
2023 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2024
2025 call_pending (EV_A);
2026 }
2027 while (expect_true (
2028 activecnt
2029 && !loop_done
2030 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2031 ));
2032
2033 if (loop_done == EVUNLOOP_ONE)
2034 loop_done = EVUNLOOP_CANCEL;
2035 }
2036
2037 void
2038 ev_unloop (EV_P_ int how)
2039 {
2040 loop_done = how;
2041 }
2042
2043 /*****************************************************************************/
2044
2045 void inline_size
2046 wlist_add (WL *head, WL elem)
2047 {
2048 elem->next = *head;
2049 *head = elem;
2050 }
2051
2052 void inline_size
2053 wlist_del (WL *head, WL elem)
2054 {
2055 while (*head)
2056 {
2057 if (*head == elem)
2058 {
2059 *head = elem->next;
2060 return;
2061 }
2062
2063 head = &(*head)->next;
2064 }
2065 }
2066
2067 void inline_speed
2068 clear_pending (EV_P_ W w)
2069 {
2070 if (w->pending)
2071 {
2072 pendings [ABSPRI (w)][w->pending - 1].w = 0;
2073 w->pending = 0;
2074 }
2075 }
2076
2077 int
2078 ev_clear_pending (EV_P_ void *w)
2079 {
2080 W w_ = (W)w;
2081 int pending = w_->pending;
2082
2083 if (expect_true (pending))
2084 {
2085 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2086 w_->pending = 0;
2087 p->w = 0;
2088 return p->events;
2089 }
2090 else
2091 return 0;
2092 }
2093
2094 void inline_size
2095 pri_adjust (EV_P_ W w)
2096 {
2097 int pri = w->priority;
2098 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2099 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2100 w->priority = pri;
2101 }
2102
2103 void inline_speed
2104 ev_start (EV_P_ W w, int active)
2105 {
2106 pri_adjust (EV_A_ w);
2107 w->active = active;
2108 ev_ref (EV_A);
2109 }
2110
2111 void inline_size
2112 ev_stop (EV_P_ W w)
2113 {
2114 ev_unref (EV_A);
2115 w->active = 0;
2116 }
2117
2118 /*****************************************************************************/
2119
2120 void noinline
2121 ev_io_start (EV_P_ ev_io *w)
2122 {
2123 int fd = w->fd;
2124
2125 if (expect_false (ev_is_active (w)))
2126 return;
2127
2128 assert (("ev_io_start called with negative fd", fd >= 0));
2129
2130 EV_FREQUENT_CHECK;
2131
2132 ev_start (EV_A_ (W)w, 1);
2133 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
2134 wlist_add (&anfds[fd].head, (WL)w);
2135
2136 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
2137 w->events &= ~EV_IOFDSET;
2138
2139 EV_FREQUENT_CHECK;
2140 }
2141
2142 void noinline
2143 ev_io_stop (EV_P_ ev_io *w)
2144 {
2145 clear_pending (EV_A_ (W)w);
2146 if (expect_false (!ev_is_active (w)))
2147 return;
2148
2149 assert (("ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2150
2151 EV_FREQUENT_CHECK;
2152
2153 wlist_del (&anfds[w->fd].head, (WL)w);
2154 ev_stop (EV_A_ (W)w);
2155
2156 fd_change (EV_A_ w->fd, 1);
2157
2158 EV_FREQUENT_CHECK;
2159 }
2160
2161 void noinline
2162 ev_timer_start (EV_P_ ev_timer *w)
2163 {
2164 if (expect_false (ev_is_active (w)))
2165 return;
2166
2167 ev_at (w) += mn_now;
2168
2169 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2170
2171 EV_FREQUENT_CHECK;
2172
2173 ++timercnt;
2174 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2175 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2176 ANHE_w (timers [ev_active (w)]) = (WT)w;
2177 ANHE_at_cache (timers [ev_active (w)]);
2178 upheap (timers, ev_active (w));
2179
2180 EV_FREQUENT_CHECK;
2181
2182 /*assert (("internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2183 }
2184
2185 void noinline
2186 ev_timer_stop (EV_P_ ev_timer *w)
2187 {
2188 clear_pending (EV_A_ (W)w);
2189 if (expect_false (!ev_is_active (w)))
2190 return;
2191
2192 EV_FREQUENT_CHECK;
2193
2194 {
2195 int active = ev_active (w);
2196
2197 assert (("internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2198
2199 --timercnt;
2200
2201 if (expect_true (active < timercnt + HEAP0))
2202 {
2203 timers [active] = timers [timercnt + HEAP0];
2204 adjustheap (timers, timercnt, active);
2205 }
2206 }
2207
2208 EV_FREQUENT_CHECK;
2209
2210 ev_at (w) -= mn_now;
2211
2212 ev_stop (EV_A_ (W)w);
2213 }
2214
2215 void noinline
2216 ev_timer_again (EV_P_ ev_timer *w)
2217 {
2218 EV_FREQUENT_CHECK;
2219
2220 if (ev_is_active (w))
2221 {
2222 if (w->repeat)
2223 {
2224 ev_at (w) = mn_now + w->repeat;
2225 ANHE_at_cache (timers [ev_active (w)]);
2226 adjustheap (timers, timercnt, ev_active (w));
2227 }
2228 else
2229 ev_timer_stop (EV_A_ w);
2230 }
2231 else if (w->repeat)
2232 {
2233 ev_at (w) = w->repeat;
2234 ev_timer_start (EV_A_ w);
2235 }
2236
2237 EV_FREQUENT_CHECK;
2238 }
2239
2240 #if EV_PERIODIC_ENABLE
2241 void noinline
2242 ev_periodic_start (EV_P_ ev_periodic *w)
2243 {
2244 if (expect_false (ev_is_active (w)))
2245 return;
2246
2247 if (w->reschedule_cb)
2248 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2249 else if (w->interval)
2250 {
2251 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
2252 /* this formula differs from the one in periodic_reify because we do not always round up */
2253 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2254 }
2255 else
2256 ev_at (w) = w->offset;
2257
2258 EV_FREQUENT_CHECK;
2259
2260 ++periodiccnt;
2261 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2262 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2263 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2264 ANHE_at_cache (periodics [ev_active (w)]);
2265 upheap (periodics, ev_active (w));
2266
2267 EV_FREQUENT_CHECK;
2268
2269 /*assert (("internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2270 }
2271
2272 void noinline
2273 ev_periodic_stop (EV_P_ ev_periodic *w)
2274 {
2275 clear_pending (EV_A_ (W)w);
2276 if (expect_false (!ev_is_active (w)))
2277 return;
2278
2279 EV_FREQUENT_CHECK;
2280
2281 {
2282 int active = ev_active (w);
2283
2284 assert (("internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2285
2286 --periodiccnt;
2287
2288 if (expect_true (active < periodiccnt + HEAP0))
2289 {
2290 periodics [active] = periodics [periodiccnt + HEAP0];
2291 adjustheap (periodics, periodiccnt, active);
2292 }
2293 }
2294
2295 EV_FREQUENT_CHECK;
2296
2297 ev_stop (EV_A_ (W)w);
2298 }
2299
2300 void noinline
2301 ev_periodic_again (EV_P_ ev_periodic *w)
2302 {
2303 /* TODO: use adjustheap and recalculation */
2304 ev_periodic_stop (EV_A_ w);
2305 ev_periodic_start (EV_A_ w);
2306 }
2307 #endif
2308
2309 #ifndef SA_RESTART
2310 # define SA_RESTART 0
2311 #endif
2312
2313 void noinline
2314 ev_signal_start (EV_P_ ev_signal *w)
2315 {
2316 #if EV_MULTIPLICITY
2317 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2318 #endif
2319 if (expect_false (ev_is_active (w)))
2320 return;
2321
2322 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2323
2324 evpipe_init (EV_A);
2325
2326 EV_FREQUENT_CHECK;
2327
2328 {
2329 #ifndef _WIN32
2330 sigset_t full, prev;
2331 sigfillset (&full);
2332 sigprocmask (SIG_SETMASK, &full, &prev);
2333 #endif
2334
2335 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2336
2337 #ifndef _WIN32
2338 sigprocmask (SIG_SETMASK, &prev, 0);
2339 #endif
2340 }
2341
2342 ev_start (EV_A_ (W)w, 1);
2343 wlist_add (&signals [w->signum - 1].head, (WL)w);
2344
2345 if (!((WL)w)->next)
2346 {
2347 #if _WIN32
2348 signal (w->signum, ev_sighandler);
2349 #else
2350 struct sigaction sa;
2351 sa.sa_handler = ev_sighandler;
2352 sigfillset (&sa.sa_mask);
2353 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2354 sigaction (w->signum, &sa, 0);
2355 #endif
2356 }
2357
2358 EV_FREQUENT_CHECK;
2359 }
2360
2361 void noinline
2362 ev_signal_stop (EV_P_ ev_signal *w)
2363 {
2364 clear_pending (EV_A_ (W)w);
2365 if (expect_false (!ev_is_active (w)))
2366 return;
2367
2368 EV_FREQUENT_CHECK;
2369
2370 wlist_del (&signals [w->signum - 1].head, (WL)w);
2371 ev_stop (EV_A_ (W)w);
2372
2373 if (!signals [w->signum - 1].head)
2374 signal (w->signum, SIG_DFL);
2375
2376 EV_FREQUENT_CHECK;
2377 }
2378
2379 void
2380 ev_child_start (EV_P_ ev_child *w)
2381 {
2382 #if EV_MULTIPLICITY
2383 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2384 #endif
2385 if (expect_false (ev_is_active (w)))
2386 return;
2387
2388 EV_FREQUENT_CHECK;
2389
2390 ev_start (EV_A_ (W)w, 1);
2391 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2392
2393 EV_FREQUENT_CHECK;
2394 }
2395
2396 void
2397 ev_child_stop (EV_P_ ev_child *w)
2398 {
2399 clear_pending (EV_A_ (W)w);
2400 if (expect_false (!ev_is_active (w)))
2401 return;
2402
2403 EV_FREQUENT_CHECK;
2404
2405 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2406 ev_stop (EV_A_ (W)w);
2407
2408 EV_FREQUENT_CHECK;
2409 }
2410
2411 #if EV_STAT_ENABLE
2412
2413 # ifdef _WIN32
2414 # undef lstat
2415 # define lstat(a,b) _stati64 (a,b)
2416 # endif
2417
2418 #define DEF_STAT_INTERVAL 5.0074891
2419 #define MIN_STAT_INTERVAL 0.1074891
2420
2421 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2422
2423 #if EV_USE_INOTIFY
2424 # define EV_INOTIFY_BUFSIZE 8192
2425
2426 static void noinline
2427 infy_add (EV_P_ ev_stat *w)
2428 {
2429 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);
2430
2431 if (w->wd < 0)
2432 {
2433 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2434
2435 /* monitor some parent directory for speedup hints */
2436 /* note that exceeding the hardcoded limit is not a correctness issue, */
2437 /* but an efficiency issue only */
2438 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2439 {
2440 char path [4096];
2441 strcpy (path, w->path);
2442
2443 do
2444 {
2445 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2446 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2447
2448 char *pend = strrchr (path, '/');
2449
2450 if (!pend)
2451 break; /* whoops, no '/', complain to your admin */
2452
2453 *pend = 0;
2454 w->wd = inotify_add_watch (fs_fd, path, mask);
2455 }
2456 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2457 }
2458 }
2459 else
2460 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2461
2462 if (w->wd >= 0)
2463 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2464 }
2465
2466 static void noinline
2467 infy_del (EV_P_ ev_stat *w)
2468 {
2469 int slot;
2470 int wd = w->wd;
2471
2472 if (wd < 0)
2473 return;
2474
2475 w->wd = -2;
2476 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2477 wlist_del (&fs_hash [slot].head, (WL)w);
2478
2479 /* remove this watcher, if others are watching it, they will rearm */
2480 inotify_rm_watch (fs_fd, wd);
2481 }
2482
2483 static void noinline
2484 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2485 {
2486 if (slot < 0)
2487 /* overflow, need to check for all hahs slots */
2488 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2489 infy_wd (EV_A_ slot, wd, ev);
2490 else
2491 {
2492 WL w_;
2493
2494 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2495 {
2496 ev_stat *w = (ev_stat *)w_;
2497 w_ = w_->next; /* lets us remove this watcher and all before it */
2498
2499 if (w->wd == wd || wd == -1)
2500 {
2501 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2502 {
2503 w->wd = -1;
2504 infy_add (EV_A_ w); /* re-add, no matter what */
2505 }
2506
2507 stat_timer_cb (EV_A_ &w->timer, 0);
2508 }
2509 }
2510 }
2511 }
2512
2513 static void
2514 infy_cb (EV_P_ ev_io *w, int revents)
2515 {
2516 char buf [EV_INOTIFY_BUFSIZE];
2517 struct inotify_event *ev = (struct inotify_event *)buf;
2518 int ofs;
2519 int len = read (fs_fd, buf, sizeof (buf));
2520
2521 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2522 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2523 }
2524
2525 void inline_size
2526 infy_init (EV_P)
2527 {
2528 if (fs_fd != -2)
2529 return;
2530
2531 fs_fd = inotify_init ();
2532
2533 if (fs_fd >= 0)
2534 {
2535 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2536 ev_set_priority (&fs_w, EV_MAXPRI);
2537 ev_io_start (EV_A_ &fs_w);
2538 }
2539 }
2540
2541 void inline_size
2542 infy_fork (EV_P)
2543 {
2544 int slot;
2545
2546 if (fs_fd < 0)
2547 return;
2548
2549 close (fs_fd);
2550 fs_fd = inotify_init ();
2551
2552 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2553 {
2554 WL w_ = fs_hash [slot].head;
2555 fs_hash [slot].head = 0;
2556
2557 while (w_)
2558 {
2559 ev_stat *w = (ev_stat *)w_;
2560 w_ = w_->next; /* lets us add this watcher */
2561
2562 w->wd = -1;
2563
2564 if (fs_fd >= 0)
2565 infy_add (EV_A_ w); /* re-add, no matter what */
2566 else
2567 ev_timer_start (EV_A_ &w->timer);
2568 }
2569
2570 }
2571 }
2572
2573 #endif
2574
2575 #ifdef _WIN32
2576 # define EV_LSTAT(p,b) _stati64 (p, b)
2577 #else
2578 # define EV_LSTAT(p,b) lstat (p, b)
2579 #endif
2580
2581 void
2582 ev_stat_stat (EV_P_ ev_stat *w)
2583 {
2584 if (lstat (w->path, &w->attr) < 0)
2585 w->attr.st_nlink = 0;
2586 else if (!w->attr.st_nlink)
2587 w->attr.st_nlink = 1;
2588 }
2589
2590 static void noinline
2591 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2592 {
2593 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2594
2595 /* we copy this here each the time so that */
2596 /* prev has the old value when the callback gets invoked */
2597 w->prev = w->attr;
2598 ev_stat_stat (EV_A_ w);
2599
2600 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2601 if (
2602 w->prev.st_dev != w->attr.st_dev
2603 || w->prev.st_ino != w->attr.st_ino
2604 || w->prev.st_mode != w->attr.st_mode
2605 || w->prev.st_nlink != w->attr.st_nlink
2606 || w->prev.st_uid != w->attr.st_uid
2607 || w->prev.st_gid != w->attr.st_gid
2608 || w->prev.st_rdev != w->attr.st_rdev
2609 || w->prev.st_size != w->attr.st_size
2610 || w->prev.st_atime != w->attr.st_atime
2611 || w->prev.st_mtime != w->attr.st_mtime
2612 || w->prev.st_ctime != w->attr.st_ctime
2613 ) {
2614 #if EV_USE_INOTIFY
2615 infy_del (EV_A_ w);
2616 infy_add (EV_A_ w);
2617 ev_stat_stat (EV_A_ w); /* avoid race... */
2618 #endif
2619
2620 ev_feed_event (EV_A_ w, EV_STAT);
2621 }
2622 }
2623
2624 void
2625 ev_stat_start (EV_P_ ev_stat *w)
2626 {
2627 if (expect_false (ev_is_active (w)))
2628 return;
2629
2630 /* since we use memcmp, we need to clear any padding data etc. */
2631 memset (&w->prev, 0, sizeof (ev_statdata));
2632 memset (&w->attr, 0, sizeof (ev_statdata));
2633
2634 ev_stat_stat (EV_A_ w);
2635
2636 if (w->interval < MIN_STAT_INTERVAL)
2637 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2638
2639 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2640 ev_set_priority (&w->timer, ev_priority (w));
2641
2642 #if EV_USE_INOTIFY
2643 infy_init (EV_A);
2644
2645 if (fs_fd >= 0)
2646 infy_add (EV_A_ w);
2647 else
2648 #endif
2649 ev_timer_start (EV_A_ &w->timer);
2650
2651 ev_start (EV_A_ (W)w, 1);
2652
2653 EV_FREQUENT_CHECK;
2654 }
2655
2656 void
2657 ev_stat_stop (EV_P_ ev_stat *w)
2658 {
2659 clear_pending (EV_A_ (W)w);
2660 if (expect_false (!ev_is_active (w)))
2661 return;
2662
2663 EV_FREQUENT_CHECK;
2664
2665 #if EV_USE_INOTIFY
2666 infy_del (EV_A_ w);
2667 #endif
2668 ev_timer_stop (EV_A_ &w->timer);
2669
2670 ev_stop (EV_A_ (W)w);
2671
2672 EV_FREQUENT_CHECK;
2673 }
2674 #endif
2675
2676 #if EV_IDLE_ENABLE
2677 void
2678 ev_idle_start (EV_P_ ev_idle *w)
2679 {
2680 if (expect_false (ev_is_active (w)))
2681 return;
2682
2683 pri_adjust (EV_A_ (W)w);
2684
2685 EV_FREQUENT_CHECK;
2686
2687 {
2688 int active = ++idlecnt [ABSPRI (w)];
2689
2690 ++idleall;
2691 ev_start (EV_A_ (W)w, active);
2692
2693 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2694 idles [ABSPRI (w)][active - 1] = w;
2695 }
2696
2697 EV_FREQUENT_CHECK;
2698 }
2699
2700 void
2701 ev_idle_stop (EV_P_ ev_idle *w)
2702 {
2703 clear_pending (EV_A_ (W)w);
2704 if (expect_false (!ev_is_active (w)))
2705 return;
2706
2707 EV_FREQUENT_CHECK;
2708
2709 {
2710 int active = ev_active (w);
2711
2712 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2713 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2714
2715 ev_stop (EV_A_ (W)w);
2716 --idleall;
2717 }
2718
2719 EV_FREQUENT_CHECK;
2720 }
2721 #endif
2722
2723 void
2724 ev_prepare_start (EV_P_ ev_prepare *w)
2725 {
2726 if (expect_false (ev_is_active (w)))
2727 return;
2728
2729 EV_FREQUENT_CHECK;
2730
2731 ev_start (EV_A_ (W)w, ++preparecnt);
2732 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2733 prepares [preparecnt - 1] = w;
2734
2735 EV_FREQUENT_CHECK;
2736 }
2737
2738 void
2739 ev_prepare_stop (EV_P_ ev_prepare *w)
2740 {
2741 clear_pending (EV_A_ (W)w);
2742 if (expect_false (!ev_is_active (w)))
2743 return;
2744
2745 EV_FREQUENT_CHECK;
2746
2747 {
2748 int active = ev_active (w);
2749
2750 prepares [active - 1] = prepares [--preparecnt];
2751 ev_active (prepares [active - 1]) = active;
2752 }
2753
2754 ev_stop (EV_A_ (W)w);
2755
2756 EV_FREQUENT_CHECK;
2757 }
2758
2759 void
2760 ev_check_start (EV_P_ ev_check *w)
2761 {
2762 if (expect_false (ev_is_active (w)))
2763 return;
2764
2765 EV_FREQUENT_CHECK;
2766
2767 ev_start (EV_A_ (W)w, ++checkcnt);
2768 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2769 checks [checkcnt - 1] = w;
2770
2771 EV_FREQUENT_CHECK;
2772 }
2773
2774 void
2775 ev_check_stop (EV_P_ ev_check *w)
2776 {
2777 clear_pending (EV_A_ (W)w);
2778 if (expect_false (!ev_is_active (w)))
2779 return;
2780
2781 EV_FREQUENT_CHECK;
2782
2783 {
2784 int active = ev_active (w);
2785
2786 checks [active - 1] = checks [--checkcnt];
2787 ev_active (checks [active - 1]) = active;
2788 }
2789
2790 ev_stop (EV_A_ (W)w);
2791
2792 EV_FREQUENT_CHECK;
2793 }
2794
2795 #if EV_EMBED_ENABLE
2796 void noinline
2797 ev_embed_sweep (EV_P_ ev_embed *w)
2798 {
2799 ev_loop (w->other, EVLOOP_NONBLOCK);
2800 }
2801
2802 static void
2803 embed_io_cb (EV_P_ ev_io *io, int revents)
2804 {
2805 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2806
2807 if (ev_cb (w))
2808 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2809 else
2810 ev_loop (w->other, EVLOOP_NONBLOCK);
2811 }
2812
2813 static void
2814 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2815 {
2816 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2817
2818 {
2819 struct ev_loop *loop = w->other;
2820
2821 while (fdchangecnt)
2822 {
2823 fd_reify (EV_A);
2824 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2825 }
2826 }
2827 }
2828
2829 #if 0
2830 static void
2831 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2832 {
2833 ev_idle_stop (EV_A_ idle);
2834 }
2835 #endif
2836
2837 void
2838 ev_embed_start (EV_P_ ev_embed *w)
2839 {
2840 if (expect_false (ev_is_active (w)))
2841 return;
2842
2843 {
2844 struct ev_loop *loop = w->other;
2845 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2846 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2847 }
2848
2849 EV_FREQUENT_CHECK;
2850
2851 ev_set_priority (&w->io, ev_priority (w));
2852 ev_io_start (EV_A_ &w->io);
2853
2854 ev_prepare_init (&w->prepare, embed_prepare_cb);
2855 ev_set_priority (&w->prepare, EV_MINPRI);
2856 ev_prepare_start (EV_A_ &w->prepare);
2857
2858 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2859
2860 ev_start (EV_A_ (W)w, 1);
2861
2862 EV_FREQUENT_CHECK;
2863 }
2864
2865 void
2866 ev_embed_stop (EV_P_ ev_embed *w)
2867 {
2868 clear_pending (EV_A_ (W)w);
2869 if (expect_false (!ev_is_active (w)))
2870 return;
2871
2872 EV_FREQUENT_CHECK;
2873
2874 ev_io_stop (EV_A_ &w->io);
2875 ev_prepare_stop (EV_A_ &w->prepare);
2876
2877 ev_stop (EV_A_ (W)w);
2878
2879 EV_FREQUENT_CHECK;
2880 }
2881 #endif
2882
2883 #if EV_FORK_ENABLE
2884 void
2885 ev_fork_start (EV_P_ ev_fork *w)
2886 {
2887 if (expect_false (ev_is_active (w)))
2888 return;
2889
2890 EV_FREQUENT_CHECK;
2891
2892 ev_start (EV_A_ (W)w, ++forkcnt);
2893 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2894 forks [forkcnt - 1] = w;
2895
2896 EV_FREQUENT_CHECK;
2897 }
2898
2899 void
2900 ev_fork_stop (EV_P_ ev_fork *w)
2901 {
2902 clear_pending (EV_A_ (W)w);
2903 if (expect_false (!ev_is_active (w)))
2904 return;
2905
2906 EV_FREQUENT_CHECK;
2907
2908 {
2909 int active = ev_active (w);
2910
2911 forks [active - 1] = forks [--forkcnt];
2912 ev_active (forks [active - 1]) = active;
2913 }
2914
2915 ev_stop (EV_A_ (W)w);
2916
2917 EV_FREQUENT_CHECK;
2918 }
2919 #endif
2920
2921 #if EV_ASYNC_ENABLE
2922 void
2923 ev_async_start (EV_P_ ev_async *w)
2924 {
2925 if (expect_false (ev_is_active (w)))
2926 return;
2927
2928 evpipe_init (EV_A);
2929
2930 EV_FREQUENT_CHECK;
2931
2932 ev_start (EV_A_ (W)w, ++asynccnt);
2933 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2934 asyncs [asynccnt - 1] = w;
2935
2936 EV_FREQUENT_CHECK;
2937 }
2938
2939 void
2940 ev_async_stop (EV_P_ ev_async *w)
2941 {
2942 clear_pending (EV_A_ (W)w);
2943 if (expect_false (!ev_is_active (w)))
2944 return;
2945
2946 EV_FREQUENT_CHECK;
2947
2948 {
2949 int active = ev_active (w);
2950
2951 asyncs [active - 1] = asyncs [--asynccnt];
2952 ev_active (asyncs [active - 1]) = active;
2953 }
2954
2955 ev_stop (EV_A_ (W)w);
2956
2957 EV_FREQUENT_CHECK;
2958 }
2959
2960 void
2961 ev_async_send (EV_P_ ev_async *w)
2962 {
2963 w->sent = 1;
2964 evpipe_write (EV_A_ &gotasync);
2965 }
2966 #endif
2967
2968 /*****************************************************************************/
2969
2970 struct ev_once
2971 {
2972 ev_io io;
2973 ev_timer to;
2974 void (*cb)(int revents, void *arg);
2975 void *arg;
2976 };
2977
2978 static void
2979 once_cb (EV_P_ struct ev_once *once, int revents)
2980 {
2981 void (*cb)(int revents, void *arg) = once->cb;
2982 void *arg = once->arg;
2983
2984 ev_io_stop (EV_A_ &once->io);
2985 ev_timer_stop (EV_A_ &once->to);
2986 ev_free (once);
2987
2988 cb (revents, arg);
2989 }
2990
2991 static void
2992 once_cb_io (EV_P_ ev_io *w, int revents)
2993 {
2994 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2995 }
2996
2997 static void
2998 once_cb_to (EV_P_ ev_timer *w, int revents)
2999 {
3000 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
3001 }
3002
3003 void
3004 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3005 {
3006 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3007
3008 if (expect_false (!once))
3009 {
3010 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3011 return;
3012 }
3013
3014 once->cb = cb;
3015 once->arg = arg;
3016
3017 ev_init (&once->io, once_cb_io);
3018 if (fd >= 0)
3019 {
3020 ev_io_set (&once->io, fd, events);
3021 ev_io_start (EV_A_ &once->io);
3022 }
3023
3024 ev_init (&once->to, once_cb_to);
3025 if (timeout >= 0.)
3026 {
3027 ev_timer_set (&once->to, timeout, 0.);
3028 ev_timer_start (EV_A_ &once->to);
3029 }
3030 }
3031
3032 #if EV_MULTIPLICITY
3033 #include "ev_wrap.h"
3034 #endif
3035
3036 #ifdef __cplusplus
3037 }
3038 #endif
3039