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Revision: 1.184
Committed: Wed Dec 12 05:30:52 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: rel-1_81
Changes since 1.183: +16 -10 lines
Log Message:
avoid backend_modify call unless ev_io_set was used

File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials provided
17 * with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifdef __cplusplus
33 extern "C" {
34 #endif
35
36 #ifndef EV_STANDALONE
37 # ifdef EV_CONFIG_H
38 # include EV_CONFIG_H
39 # else
40 # include "config.h"
41 # endif
42
43 # if HAVE_CLOCK_GETTIME
44 # ifndef EV_USE_MONOTONIC
45 # define EV_USE_MONOTONIC 1
46 # endif
47 # ifndef EV_USE_REALTIME
48 # define EV_USE_REALTIME 1
49 # endif
50 # else
51 # ifndef EV_USE_MONOTONIC
52 # define EV_USE_MONOTONIC 0
53 # endif
54 # ifndef EV_USE_REALTIME
55 # define EV_USE_REALTIME 0
56 # endif
57 # endif
58
59 # ifndef EV_USE_SELECT
60 # if HAVE_SELECT && HAVE_SYS_SELECT_H
61 # define EV_USE_SELECT 1
62 # else
63 # define EV_USE_SELECT 0
64 # endif
65 # endif
66
67 # ifndef EV_USE_POLL
68 # if HAVE_POLL && HAVE_POLL_H
69 # define EV_USE_POLL 1
70 # else
71 # define EV_USE_POLL 0
72 # endif
73 # endif
74
75 # ifndef EV_USE_EPOLL
76 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
77 # define EV_USE_EPOLL 1
78 # else
79 # define EV_USE_EPOLL 0
80 # endif
81 # endif
82
83 # ifndef EV_USE_KQUEUE
84 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
85 # define EV_USE_KQUEUE 1
86 # else
87 # define EV_USE_KQUEUE 0
88 # endif
89 # endif
90
91 # ifndef EV_USE_PORT
92 # if HAVE_PORT_H && HAVE_PORT_CREATE
93 # define EV_USE_PORT 1
94 # else
95 # define EV_USE_PORT 0
96 # endif
97 # endif
98
99 # ifndef EV_USE_INOTIFY
100 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
101 # define EV_USE_INOTIFY 1
102 # else
103 # define EV_USE_INOTIFY 0
104 # endif
105 # endif
106
107 #endif
108
109 #include <math.h>
110 #include <stdlib.h>
111 #include <fcntl.h>
112 #include <stddef.h>
113
114 #include <stdio.h>
115
116 #include <assert.h>
117 #include <errno.h>
118 #include <sys/types.h>
119 #include <time.h>
120
121 #include <signal.h>
122
123 #ifdef EV_H
124 # include EV_H
125 #else
126 # include "ev.h"
127 #endif
128
129 #ifndef _WIN32
130 # include <sys/time.h>
131 # include <sys/wait.h>
132 # include <unistd.h>
133 #else
134 # define WIN32_LEAN_AND_MEAN
135 # include <windows.h>
136 # ifndef EV_SELECT_IS_WINSOCKET
137 # define EV_SELECT_IS_WINSOCKET 1
138 # endif
139 #endif
140
141 /**/
142
143 #ifndef EV_USE_MONOTONIC
144 # define EV_USE_MONOTONIC 0
145 #endif
146
147 #ifndef EV_USE_REALTIME
148 # define EV_USE_REALTIME 0
149 #endif
150
151 #ifndef EV_USE_SELECT
152 # define EV_USE_SELECT 1
153 #endif
154
155 #ifndef EV_USE_POLL
156 # ifdef _WIN32
157 # define EV_USE_POLL 0
158 # else
159 # define EV_USE_POLL 1
160 # endif
161 #endif
162
163 #ifndef EV_USE_EPOLL
164 # define EV_USE_EPOLL 0
165 #endif
166
167 #ifndef EV_USE_KQUEUE
168 # define EV_USE_KQUEUE 0
169 #endif
170
171 #ifndef EV_USE_PORT
172 # define EV_USE_PORT 0
173 #endif
174
175 #ifndef EV_USE_INOTIFY
176 # define EV_USE_INOTIFY 0
177 #endif
178
179 #ifndef EV_PID_HASHSIZE
180 # if EV_MINIMAL
181 # define EV_PID_HASHSIZE 1
182 # else
183 # define EV_PID_HASHSIZE 16
184 # endif
185 #endif
186
187 #ifndef EV_INOTIFY_HASHSIZE
188 # if EV_MINIMAL
189 # define EV_INOTIFY_HASHSIZE 1
190 # else
191 # define EV_INOTIFY_HASHSIZE 16
192 # endif
193 #endif
194
195 /**/
196
197 #ifndef CLOCK_MONOTONIC
198 # undef EV_USE_MONOTONIC
199 # define EV_USE_MONOTONIC 0
200 #endif
201
202 #ifndef CLOCK_REALTIME
203 # undef EV_USE_REALTIME
204 # define EV_USE_REALTIME 0
205 #endif
206
207 #if EV_SELECT_IS_WINSOCKET
208 # include <winsock.h>
209 #endif
210
211 #if !EV_STAT_ENABLE
212 # define EV_USE_INOTIFY 0
213 #endif
214
215 #if EV_USE_INOTIFY
216 # include <sys/inotify.h>
217 #endif
218
219 /**/
220
221 /*
222 * This is used to avoid floating point rounding problems.
223 * It is added to ev_rt_now when scheduling periodics
224 * to ensure progress, time-wise, even when rounding
225 * errors are against us.
226 * This value is good at least till the year 4000.
227 * Better solutions welcome.
228 */
229 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
230
231 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
232 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
233 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
234
235 #if __GNUC__ >= 3
236 # define expect(expr,value) __builtin_expect ((expr),(value))
237 # define noinline __attribute__ ((noinline))
238 #else
239 # define expect(expr,value) (expr)
240 # define noinline
241 # if __STDC_VERSION__ < 199901L
242 # define inline
243 # endif
244 #endif
245
246 #define expect_false(expr) expect ((expr) != 0, 0)
247 #define expect_true(expr) expect ((expr) != 0, 1)
248 #define inline_size static inline
249
250 #if EV_MINIMAL
251 # define inline_speed static noinline
252 #else
253 # define inline_speed static inline
254 #endif
255
256 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
257 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
258
259 #define EMPTY /* required for microsofts broken pseudo-c compiler */
260 #define EMPTY2(a,b) /* used to suppress some warnings */
261
262 typedef ev_watcher *W;
263 typedef ev_watcher_list *WL;
264 typedef ev_watcher_time *WT;
265
266 static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
267
268 #ifdef _WIN32
269 # include "ev_win32.c"
270 #endif
271
272 /*****************************************************************************/
273
274 static void (*syserr_cb)(const char *msg);
275
276 void
277 ev_set_syserr_cb (void (*cb)(const char *msg))
278 {
279 syserr_cb = cb;
280 }
281
282 static void noinline
283 syserr (const char *msg)
284 {
285 if (!msg)
286 msg = "(libev) system error";
287
288 if (syserr_cb)
289 syserr_cb (msg);
290 else
291 {
292 perror (msg);
293 abort ();
294 }
295 }
296
297 static void *(*alloc)(void *ptr, long size);
298
299 void
300 ev_set_allocator (void *(*cb)(void *ptr, long size))
301 {
302 alloc = cb;
303 }
304
305 inline_speed void *
306 ev_realloc (void *ptr, long size)
307 {
308 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
309
310 if (!ptr && size)
311 {
312 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
313 abort ();
314 }
315
316 return ptr;
317 }
318
319 #define ev_malloc(size) ev_realloc (0, (size))
320 #define ev_free(ptr) ev_realloc ((ptr), 0)
321
322 /*****************************************************************************/
323
324 typedef struct
325 {
326 WL head;
327 unsigned char events;
328 unsigned char reify;
329 #if EV_SELECT_IS_WINSOCKET
330 SOCKET handle;
331 #endif
332 } ANFD;
333
334 typedef struct
335 {
336 W w;
337 int events;
338 } ANPENDING;
339
340 #if EV_USE_INOTIFY
341 typedef struct
342 {
343 WL head;
344 } ANFS;
345 #endif
346
347 #if EV_MULTIPLICITY
348
349 struct ev_loop
350 {
351 ev_tstamp ev_rt_now;
352 #define ev_rt_now ((loop)->ev_rt_now)
353 #define VAR(name,decl) decl;
354 #include "ev_vars.h"
355 #undef VAR
356 };
357 #include "ev_wrap.h"
358
359 static struct ev_loop default_loop_struct;
360 struct ev_loop *ev_default_loop_ptr;
361
362 #else
363
364 ev_tstamp ev_rt_now;
365 #define VAR(name,decl) static decl;
366 #include "ev_vars.h"
367 #undef VAR
368
369 static int ev_default_loop_ptr;
370
371 #endif
372
373 /*****************************************************************************/
374
375 ev_tstamp
376 ev_time (void)
377 {
378 #if EV_USE_REALTIME
379 struct timespec ts;
380 clock_gettime (CLOCK_REALTIME, &ts);
381 return ts.tv_sec + ts.tv_nsec * 1e-9;
382 #else
383 struct timeval tv;
384 gettimeofday (&tv, 0);
385 return tv.tv_sec + tv.tv_usec * 1e-6;
386 #endif
387 }
388
389 ev_tstamp inline_size
390 get_clock (void)
391 {
392 #if EV_USE_MONOTONIC
393 if (expect_true (have_monotonic))
394 {
395 struct timespec ts;
396 clock_gettime (CLOCK_MONOTONIC, &ts);
397 return ts.tv_sec + ts.tv_nsec * 1e-9;
398 }
399 #endif
400
401 return ev_time ();
402 }
403
404 #if EV_MULTIPLICITY
405 ev_tstamp
406 ev_now (EV_P)
407 {
408 return ev_rt_now;
409 }
410 #endif
411
412 int inline_size
413 array_nextsize (int elem, int cur, int cnt)
414 {
415 int ncur = cur + 1;
416
417 do
418 ncur <<= 1;
419 while (cnt > ncur);
420
421 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
422 if (elem * ncur > 4096)
423 {
424 ncur *= elem;
425 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
426 ncur = ncur - sizeof (void *) * 4;
427 ncur /= elem;
428 }
429
430 return ncur;
431 }
432
433 static noinline void *
434 array_realloc (int elem, void *base, int *cur, int cnt)
435 {
436 *cur = array_nextsize (elem, *cur, cnt);
437 return ev_realloc (base, elem * *cur);
438 }
439
440 #define array_needsize(type,base,cur,cnt,init) \
441 if (expect_false ((cnt) > (cur))) \
442 { \
443 int ocur_ = (cur); \
444 (base) = (type *)array_realloc \
445 (sizeof (type), (base), &(cur), (cnt)); \
446 init ((base) + (ocur_), (cur) - ocur_); \
447 }
448
449 #if 0
450 #define array_slim(type,stem) \
451 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
452 { \
453 stem ## max = array_roundsize (stem ## cnt >> 1); \
454 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
455 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
456 }
457 #endif
458
459 #define array_free(stem, idx) \
460 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
461
462 /*****************************************************************************/
463
464 void noinline
465 ev_feed_event (EV_P_ void *w, int revents)
466 {
467 W w_ = (W)w;
468 int pri = ABSPRI (w_);
469
470 if (expect_false (w_->pending))
471 pendings [pri][w_->pending - 1].events |= revents;
472 else
473 {
474 w_->pending = ++pendingcnt [pri];
475 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
476 pendings [pri][w_->pending - 1].w = w_;
477 pendings [pri][w_->pending - 1].events = revents;
478 }
479 }
480
481 void inline_speed
482 queue_events (EV_P_ W *events, int eventcnt, int type)
483 {
484 int i;
485
486 for (i = 0; i < eventcnt; ++i)
487 ev_feed_event (EV_A_ events [i], type);
488 }
489
490 /*****************************************************************************/
491
492 void inline_size
493 anfds_init (ANFD *base, int count)
494 {
495 while (count--)
496 {
497 base->head = 0;
498 base->events = EV_NONE;
499 base->reify = 0;
500
501 ++base;
502 }
503 }
504
505 void inline_speed
506 fd_event (EV_P_ int fd, int revents)
507 {
508 ANFD *anfd = anfds + fd;
509 ev_io *w;
510
511 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
512 {
513 int ev = w->events & revents;
514
515 if (ev)
516 ev_feed_event (EV_A_ (W)w, ev);
517 }
518 }
519
520 void
521 ev_feed_fd_event (EV_P_ int fd, int revents)
522 {
523 if (fd >= 0 && fd < anfdmax)
524 fd_event (EV_A_ fd, revents);
525 }
526
527 void inline_size
528 fd_reify (EV_P)
529 {
530 int i;
531
532 for (i = 0; i < fdchangecnt; ++i)
533 {
534 int fd = fdchanges [i];
535 ANFD *anfd = anfds + fd;
536 ev_io *w;
537
538 unsigned char events = 0;
539
540 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
541 events |= (unsigned char)w->events;
542
543 #if EV_SELECT_IS_WINSOCKET
544 if (events)
545 {
546 unsigned long argp;
547 anfd->handle = _get_osfhandle (fd);
548 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
549 }
550 #endif
551
552 {
553 unsigned char o_events = anfd->events;
554 unsigned char o_reify = anfd->reify;
555
556 anfd->reify = 0;
557 anfd->events = events;
558
559 if (o_events != events || o_reify & EV_IOFDSET)
560 backend_modify (EV_A_ fd, o_events, events);
561 }
562 }
563
564 fdchangecnt = 0;
565 }
566
567 void inline_size
568 fd_change (EV_P_ int fd, int flags)
569 {
570 unsigned char reify = anfds [fd].reify;
571 anfds [fd].reify |= flags;
572
573 if (expect_true (!reify))
574 {
575 ++fdchangecnt;
576 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
577 fdchanges [fdchangecnt - 1] = fd;
578 }
579 }
580
581 void inline_speed
582 fd_kill (EV_P_ int fd)
583 {
584 ev_io *w;
585
586 while ((w = (ev_io *)anfds [fd].head))
587 {
588 ev_io_stop (EV_A_ w);
589 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
590 }
591 }
592
593 int inline_size
594 fd_valid (int fd)
595 {
596 #ifdef _WIN32
597 return _get_osfhandle (fd) != -1;
598 #else
599 return fcntl (fd, F_GETFD) != -1;
600 #endif
601 }
602
603 /* called on EBADF to verify fds */
604 static void noinline
605 fd_ebadf (EV_P)
606 {
607 int fd;
608
609 for (fd = 0; fd < anfdmax; ++fd)
610 if (anfds [fd].events)
611 if (!fd_valid (fd) == -1 && errno == EBADF)
612 fd_kill (EV_A_ fd);
613 }
614
615 /* called on ENOMEM in select/poll to kill some fds and retry */
616 static void noinline
617 fd_enomem (EV_P)
618 {
619 int fd;
620
621 for (fd = anfdmax; fd--; )
622 if (anfds [fd].events)
623 {
624 fd_kill (EV_A_ fd);
625 return;
626 }
627 }
628
629 /* usually called after fork if backend needs to re-arm all fds from scratch */
630 static void noinline
631 fd_rearm_all (EV_P)
632 {
633 int fd;
634
635 for (fd = 0; fd < anfdmax; ++fd)
636 if (anfds [fd].events)
637 {
638 anfds [fd].events = 0;
639 fd_change (EV_A_ fd, EV_IOFDSET | 1);
640 }
641 }
642
643 /*****************************************************************************/
644
645 void inline_speed
646 upheap (WT *heap, int k)
647 {
648 WT w = heap [k];
649
650 while (k)
651 {
652 int p = (k - 1) >> 1;
653
654 if (heap [p]->at <= w->at)
655 break;
656
657 heap [k] = heap [p];
658 ((W)heap [k])->active = k + 1;
659 k = p;
660 }
661
662 heap [k] = w;
663 ((W)heap [k])->active = k + 1;
664 }
665
666 void inline_speed
667 downheap (WT *heap, int N, int k)
668 {
669 WT w = heap [k];
670
671 for (;;)
672 {
673 int c = (k << 1) + 1;
674
675 if (c >= N)
676 break;
677
678 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
679 ? 1 : 0;
680
681 if (w->at <= heap [c]->at)
682 break;
683
684 heap [k] = heap [c];
685 ((W)heap [k])->active = k + 1;
686
687 k = c;
688 }
689
690 heap [k] = w;
691 ((W)heap [k])->active = k + 1;
692 }
693
694 void inline_size
695 adjustheap (WT *heap, int N, int k)
696 {
697 upheap (heap, k);
698 downheap (heap, N, k);
699 }
700
701 /*****************************************************************************/
702
703 typedef struct
704 {
705 WL head;
706 sig_atomic_t volatile gotsig;
707 } ANSIG;
708
709 static ANSIG *signals;
710 static int signalmax;
711
712 static int sigpipe [2];
713 static sig_atomic_t volatile gotsig;
714 static ev_io sigev;
715
716 void inline_size
717 signals_init (ANSIG *base, int count)
718 {
719 while (count--)
720 {
721 base->head = 0;
722 base->gotsig = 0;
723
724 ++base;
725 }
726 }
727
728 static void
729 sighandler (int signum)
730 {
731 #if _WIN32
732 signal (signum, sighandler);
733 #endif
734
735 signals [signum - 1].gotsig = 1;
736
737 if (!gotsig)
738 {
739 int old_errno = errno;
740 gotsig = 1;
741 write (sigpipe [1], &signum, 1);
742 errno = old_errno;
743 }
744 }
745
746 void noinline
747 ev_feed_signal_event (EV_P_ int signum)
748 {
749 WL w;
750
751 #if EV_MULTIPLICITY
752 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
753 #endif
754
755 --signum;
756
757 if (signum < 0 || signum >= signalmax)
758 return;
759
760 signals [signum].gotsig = 0;
761
762 for (w = signals [signum].head; w; w = w->next)
763 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
764 }
765
766 static void
767 sigcb (EV_P_ ev_io *iow, int revents)
768 {
769 int signum;
770
771 read (sigpipe [0], &revents, 1);
772 gotsig = 0;
773
774 for (signum = signalmax; signum--; )
775 if (signals [signum].gotsig)
776 ev_feed_signal_event (EV_A_ signum + 1);
777 }
778
779 void inline_speed
780 fd_intern (int fd)
781 {
782 #ifdef _WIN32
783 int arg = 1;
784 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
785 #else
786 fcntl (fd, F_SETFD, FD_CLOEXEC);
787 fcntl (fd, F_SETFL, O_NONBLOCK);
788 #endif
789 }
790
791 static void noinline
792 siginit (EV_P)
793 {
794 fd_intern (sigpipe [0]);
795 fd_intern (sigpipe [1]);
796
797 ev_io_set (&sigev, sigpipe [0], EV_READ);
798 ev_io_start (EV_A_ &sigev);
799 ev_unref (EV_A); /* child watcher should not keep loop alive */
800 }
801
802 /*****************************************************************************/
803
804 static WL childs [EV_PID_HASHSIZE];
805
806 #ifndef _WIN32
807
808 static ev_signal childev;
809
810 void inline_speed
811 child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
812 {
813 ev_child *w;
814
815 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
816 if (w->pid == pid || !w->pid)
817 {
818 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
819 w->rpid = pid;
820 w->rstatus = status;
821 ev_feed_event (EV_A_ (W)w, EV_CHILD);
822 }
823 }
824
825 #ifndef WCONTINUED
826 # define WCONTINUED 0
827 #endif
828
829 static void
830 childcb (EV_P_ ev_signal *sw, int revents)
831 {
832 int pid, status;
833
834 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
835 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
836 if (!WCONTINUED
837 || errno != EINVAL
838 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
839 return;
840
841 /* make sure we are called again until all childs have been reaped */
842 /* we need to do it this way so that the callback gets called before we continue */
843 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
844
845 child_reap (EV_A_ sw, pid, pid, status);
846 if (EV_PID_HASHSIZE > 1)
847 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
848 }
849
850 #endif
851
852 /*****************************************************************************/
853
854 #if EV_USE_PORT
855 # include "ev_port.c"
856 #endif
857 #if EV_USE_KQUEUE
858 # include "ev_kqueue.c"
859 #endif
860 #if EV_USE_EPOLL
861 # include "ev_epoll.c"
862 #endif
863 #if EV_USE_POLL
864 # include "ev_poll.c"
865 #endif
866 #if EV_USE_SELECT
867 # include "ev_select.c"
868 #endif
869
870 int
871 ev_version_major (void)
872 {
873 return EV_VERSION_MAJOR;
874 }
875
876 int
877 ev_version_minor (void)
878 {
879 return EV_VERSION_MINOR;
880 }
881
882 /* return true if we are running with elevated privileges and should ignore env variables */
883 int inline_size
884 enable_secure (void)
885 {
886 #ifdef _WIN32
887 return 0;
888 #else
889 return getuid () != geteuid ()
890 || getgid () != getegid ();
891 #endif
892 }
893
894 unsigned int
895 ev_supported_backends (void)
896 {
897 unsigned int flags = 0;
898
899 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
900 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
901 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
902 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
903 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
904
905 return flags;
906 }
907
908 unsigned int
909 ev_recommended_backends (void)
910 {
911 unsigned int flags = ev_supported_backends ();
912
913 #ifndef __NetBSD__
914 /* kqueue is borked on everything but netbsd apparently */
915 /* it usually doesn't work correctly on anything but sockets and pipes */
916 flags &= ~EVBACKEND_KQUEUE;
917 #endif
918 #ifdef __APPLE__
919 // flags &= ~EVBACKEND_KQUEUE; for documentation
920 flags &= ~EVBACKEND_POLL;
921 #endif
922
923 return flags;
924 }
925
926 unsigned int
927 ev_embeddable_backends (void)
928 {
929 return EVBACKEND_EPOLL
930 | EVBACKEND_KQUEUE
931 | EVBACKEND_PORT;
932 }
933
934 unsigned int
935 ev_backend (EV_P)
936 {
937 return backend;
938 }
939
940 unsigned int
941 ev_loop_count (EV_P)
942 {
943 return loop_count;
944 }
945
946 static void noinline
947 loop_init (EV_P_ unsigned int flags)
948 {
949 if (!backend)
950 {
951 #if EV_USE_MONOTONIC
952 {
953 struct timespec ts;
954 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
955 have_monotonic = 1;
956 }
957 #endif
958
959 ev_rt_now = ev_time ();
960 mn_now = get_clock ();
961 now_floor = mn_now;
962 rtmn_diff = ev_rt_now - mn_now;
963
964 /* pid check not overridable via env */
965 #ifndef _WIN32
966 if (flags & EVFLAG_FORKCHECK)
967 curpid = getpid ();
968 #endif
969
970 if (!(flags & EVFLAG_NOENV)
971 && !enable_secure ()
972 && getenv ("LIBEV_FLAGS"))
973 flags = atoi (getenv ("LIBEV_FLAGS"));
974
975 if (!(flags & 0x0000ffffUL))
976 flags |= ev_recommended_backends ();
977
978 backend = 0;
979 backend_fd = -1;
980 #if EV_USE_INOTIFY
981 fs_fd = -2;
982 #endif
983
984 #if EV_USE_PORT
985 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
986 #endif
987 #if EV_USE_KQUEUE
988 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
989 #endif
990 #if EV_USE_EPOLL
991 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
992 #endif
993 #if EV_USE_POLL
994 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
995 #endif
996 #if EV_USE_SELECT
997 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
998 #endif
999
1000 ev_init (&sigev, sigcb);
1001 ev_set_priority (&sigev, EV_MAXPRI);
1002 }
1003 }
1004
1005 static void noinline
1006 loop_destroy (EV_P)
1007 {
1008 int i;
1009
1010 #if EV_USE_INOTIFY
1011 if (fs_fd >= 0)
1012 close (fs_fd);
1013 #endif
1014
1015 if (backend_fd >= 0)
1016 close (backend_fd);
1017
1018 #if EV_USE_PORT
1019 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1020 #endif
1021 #if EV_USE_KQUEUE
1022 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1023 #endif
1024 #if EV_USE_EPOLL
1025 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1026 #endif
1027 #if EV_USE_POLL
1028 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1029 #endif
1030 #if EV_USE_SELECT
1031 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1032 #endif
1033
1034 for (i = NUMPRI; i--; )
1035 {
1036 array_free (pending, [i]);
1037 #if EV_IDLE_ENABLE
1038 array_free (idle, [i]);
1039 #endif
1040 }
1041
1042 /* have to use the microsoft-never-gets-it-right macro */
1043 array_free (fdchange, EMPTY);
1044 array_free (timer, EMPTY);
1045 #if EV_PERIODIC_ENABLE
1046 array_free (periodic, EMPTY);
1047 #endif
1048 array_free (prepare, EMPTY);
1049 array_free (check, EMPTY);
1050
1051 backend = 0;
1052 }
1053
1054 void inline_size infy_fork (EV_P);
1055
1056 void inline_size
1057 loop_fork (EV_P)
1058 {
1059 #if EV_USE_PORT
1060 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1061 #endif
1062 #if EV_USE_KQUEUE
1063 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1064 #endif
1065 #if EV_USE_EPOLL
1066 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1067 #endif
1068 #if EV_USE_INOTIFY
1069 infy_fork (EV_A);
1070 #endif
1071
1072 if (ev_is_active (&sigev))
1073 {
1074 /* default loop */
1075
1076 ev_ref (EV_A);
1077 ev_io_stop (EV_A_ &sigev);
1078 close (sigpipe [0]);
1079 close (sigpipe [1]);
1080
1081 while (pipe (sigpipe))
1082 syserr ("(libev) error creating pipe");
1083
1084 siginit (EV_A);
1085 }
1086
1087 postfork = 0;
1088 }
1089
1090 #if EV_MULTIPLICITY
1091 struct ev_loop *
1092 ev_loop_new (unsigned int flags)
1093 {
1094 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1095
1096 memset (loop, 0, sizeof (struct ev_loop));
1097
1098 loop_init (EV_A_ flags);
1099
1100 if (ev_backend (EV_A))
1101 return loop;
1102
1103 return 0;
1104 }
1105
1106 void
1107 ev_loop_destroy (EV_P)
1108 {
1109 loop_destroy (EV_A);
1110 ev_free (loop);
1111 }
1112
1113 void
1114 ev_loop_fork (EV_P)
1115 {
1116 postfork = 1;
1117 }
1118
1119 #endif
1120
1121 #if EV_MULTIPLICITY
1122 struct ev_loop *
1123 ev_default_loop_init (unsigned int flags)
1124 #else
1125 int
1126 ev_default_loop (unsigned int flags)
1127 #endif
1128 {
1129 if (sigpipe [0] == sigpipe [1])
1130 if (pipe (sigpipe))
1131 return 0;
1132
1133 if (!ev_default_loop_ptr)
1134 {
1135 #if EV_MULTIPLICITY
1136 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1137 #else
1138 ev_default_loop_ptr = 1;
1139 #endif
1140
1141 loop_init (EV_A_ flags);
1142
1143 if (ev_backend (EV_A))
1144 {
1145 siginit (EV_A);
1146
1147 #ifndef _WIN32
1148 ev_signal_init (&childev, childcb, SIGCHLD);
1149 ev_set_priority (&childev, EV_MAXPRI);
1150 ev_signal_start (EV_A_ &childev);
1151 ev_unref (EV_A); /* child watcher should not keep loop alive */
1152 #endif
1153 }
1154 else
1155 ev_default_loop_ptr = 0;
1156 }
1157
1158 return ev_default_loop_ptr;
1159 }
1160
1161 void
1162 ev_default_destroy (void)
1163 {
1164 #if EV_MULTIPLICITY
1165 struct ev_loop *loop = ev_default_loop_ptr;
1166 #endif
1167
1168 #ifndef _WIN32
1169 ev_ref (EV_A); /* child watcher */
1170 ev_signal_stop (EV_A_ &childev);
1171 #endif
1172
1173 ev_ref (EV_A); /* signal watcher */
1174 ev_io_stop (EV_A_ &sigev);
1175
1176 close (sigpipe [0]); sigpipe [0] = 0;
1177 close (sigpipe [1]); sigpipe [1] = 0;
1178
1179 loop_destroy (EV_A);
1180 }
1181
1182 void
1183 ev_default_fork (void)
1184 {
1185 #if EV_MULTIPLICITY
1186 struct ev_loop *loop = ev_default_loop_ptr;
1187 #endif
1188
1189 if (backend)
1190 postfork = 1;
1191 }
1192
1193 /*****************************************************************************/
1194
1195 void
1196 ev_invoke (EV_P_ void *w, int revents)
1197 {
1198 EV_CB_INVOKE ((W)w, revents);
1199 }
1200
1201 void inline_speed
1202 call_pending (EV_P)
1203 {
1204 int pri;
1205
1206 for (pri = NUMPRI; pri--; )
1207 while (pendingcnt [pri])
1208 {
1209 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1210
1211 if (expect_true (p->w))
1212 {
1213 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1214
1215 p->w->pending = 0;
1216 EV_CB_INVOKE (p->w, p->events);
1217 }
1218 }
1219 }
1220
1221 void inline_size
1222 timers_reify (EV_P)
1223 {
1224 while (timercnt && ((WT)timers [0])->at <= mn_now)
1225 {
1226 ev_timer *w = (ev_timer *)timers [0];
1227
1228 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1229
1230 /* first reschedule or stop timer */
1231 if (w->repeat)
1232 {
1233 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1234
1235 ((WT)w)->at += w->repeat;
1236 if (((WT)w)->at < mn_now)
1237 ((WT)w)->at = mn_now;
1238
1239 downheap (timers, timercnt, 0);
1240 }
1241 else
1242 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1243
1244 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1245 }
1246 }
1247
1248 #if EV_PERIODIC_ENABLE
1249 void inline_size
1250 periodics_reify (EV_P)
1251 {
1252 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1253 {
1254 ev_periodic *w = (ev_periodic *)periodics [0];
1255
1256 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1257
1258 /* first reschedule or stop timer */
1259 if (w->reschedule_cb)
1260 {
1261 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1262 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1263 downheap (periodics, periodiccnt, 0);
1264 }
1265 else if (w->interval)
1266 {
1267 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1268 if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
1269 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1270 downheap (periodics, periodiccnt, 0);
1271 }
1272 else
1273 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1274
1275 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1276 }
1277 }
1278
1279 static void noinline
1280 periodics_reschedule (EV_P)
1281 {
1282 int i;
1283
1284 /* adjust periodics after time jump */
1285 for (i = 0; i < periodiccnt; ++i)
1286 {
1287 ev_periodic *w = (ev_periodic *)periodics [i];
1288
1289 if (w->reschedule_cb)
1290 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1291 else if (w->interval)
1292 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1293 }
1294
1295 /* now rebuild the heap */
1296 for (i = periodiccnt >> 1; i--; )
1297 downheap (periodics, periodiccnt, i);
1298 }
1299 #endif
1300
1301 #if EV_IDLE_ENABLE
1302 void inline_size
1303 idle_reify (EV_P)
1304 {
1305 if (expect_false (idleall))
1306 {
1307 int pri;
1308
1309 for (pri = NUMPRI; pri--; )
1310 {
1311 if (pendingcnt [pri])
1312 break;
1313
1314 if (idlecnt [pri])
1315 {
1316 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1317 break;
1318 }
1319 }
1320 }
1321 }
1322 #endif
1323
1324 void inline_speed
1325 time_update (EV_P_ ev_tstamp max_block)
1326 {
1327 int i;
1328
1329 #if EV_USE_MONOTONIC
1330 if (expect_true (have_monotonic))
1331 {
1332 ev_tstamp odiff = rtmn_diff;
1333
1334 mn_now = get_clock ();
1335
1336 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1337 /* interpolate in the meantime */
1338 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1339 {
1340 ev_rt_now = rtmn_diff + mn_now;
1341 return;
1342 }
1343
1344 now_floor = mn_now;
1345 ev_rt_now = ev_time ();
1346
1347 /* loop a few times, before making important decisions.
1348 * on the choice of "4": one iteration isn't enough,
1349 * in case we get preempted during the calls to
1350 * ev_time and get_clock. a second call is almost guaranteed
1351 * to succeed in that case, though. and looping a few more times
1352 * doesn't hurt either as we only do this on time-jumps or
1353 * in the unlikely event of having been preempted here.
1354 */
1355 for (i = 4; --i; )
1356 {
1357 rtmn_diff = ev_rt_now - mn_now;
1358
1359 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1360 return; /* all is well */
1361
1362 ev_rt_now = ev_time ();
1363 mn_now = get_clock ();
1364 now_floor = mn_now;
1365 }
1366
1367 # if EV_PERIODIC_ENABLE
1368 periodics_reschedule (EV_A);
1369 # endif
1370 /* no timer adjustment, as the monotonic clock doesn't jump */
1371 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1372 }
1373 else
1374 #endif
1375 {
1376 ev_rt_now = ev_time ();
1377
1378 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1379 {
1380 #if EV_PERIODIC_ENABLE
1381 periodics_reschedule (EV_A);
1382 #endif
1383 /* adjust timers. this is easy, as the offset is the same for all of them */
1384 for (i = 0; i < timercnt; ++i)
1385 ((WT)timers [i])->at += ev_rt_now - mn_now;
1386 }
1387
1388 mn_now = ev_rt_now;
1389 }
1390 }
1391
1392 void
1393 ev_ref (EV_P)
1394 {
1395 ++activecnt;
1396 }
1397
1398 void
1399 ev_unref (EV_P)
1400 {
1401 --activecnt;
1402 }
1403
1404 static int loop_done;
1405
1406 void
1407 ev_loop (EV_P_ int flags)
1408 {
1409 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1410 ? EVUNLOOP_ONE
1411 : EVUNLOOP_CANCEL;
1412
1413 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1414
1415 do
1416 {
1417 #ifndef _WIN32
1418 if (expect_false (curpid)) /* penalise the forking check even more */
1419 if (expect_false (getpid () != curpid))
1420 {
1421 curpid = getpid ();
1422 postfork = 1;
1423 }
1424 #endif
1425
1426 #if EV_FORK_ENABLE
1427 /* we might have forked, so queue fork handlers */
1428 if (expect_false (postfork))
1429 if (forkcnt)
1430 {
1431 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1432 call_pending (EV_A);
1433 }
1434 #endif
1435
1436 /* queue prepare watchers (and execute them) */
1437 if (expect_false (preparecnt))
1438 {
1439 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1440 call_pending (EV_A);
1441 }
1442
1443 if (expect_false (!activecnt))
1444 break;
1445
1446 /* we might have forked, so reify kernel state if necessary */
1447 if (expect_false (postfork))
1448 loop_fork (EV_A);
1449
1450 /* update fd-related kernel structures */
1451 fd_reify (EV_A);
1452
1453 /* calculate blocking time */
1454 {
1455 ev_tstamp block;
1456
1457 if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
1458 block = 0.; /* do not block at all */
1459 else
1460 {
1461 /* update time to cancel out callback processing overhead */
1462 time_update (EV_A_ 1e100);
1463
1464 block = MAX_BLOCKTIME;
1465
1466 if (timercnt)
1467 {
1468 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1469 if (block > to) block = to;
1470 }
1471
1472 #if EV_PERIODIC_ENABLE
1473 if (periodiccnt)
1474 {
1475 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1476 if (block > to) block = to;
1477 }
1478 #endif
1479
1480 if (expect_false (block < 0.)) block = 0.;
1481 }
1482
1483 ++loop_count;
1484 backend_poll (EV_A_ block);
1485
1486 /* update ev_rt_now, do magic */
1487 time_update (EV_A_ block);
1488 }
1489
1490 /* queue pending timers and reschedule them */
1491 timers_reify (EV_A); /* relative timers called last */
1492 #if EV_PERIODIC_ENABLE
1493 periodics_reify (EV_A); /* absolute timers called first */
1494 #endif
1495
1496 #if EV_IDLE_ENABLE
1497 /* queue idle watchers unless other events are pending */
1498 idle_reify (EV_A);
1499 #endif
1500
1501 /* queue check watchers, to be executed first */
1502 if (expect_false (checkcnt))
1503 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1504
1505 call_pending (EV_A);
1506
1507 }
1508 while (expect_true (activecnt && !loop_done));
1509
1510 if (loop_done == EVUNLOOP_ONE)
1511 loop_done = EVUNLOOP_CANCEL;
1512 }
1513
1514 void
1515 ev_unloop (EV_P_ int how)
1516 {
1517 loop_done = how;
1518 }
1519
1520 /*****************************************************************************/
1521
1522 void inline_size
1523 wlist_add (WL *head, WL elem)
1524 {
1525 elem->next = *head;
1526 *head = elem;
1527 }
1528
1529 void inline_size
1530 wlist_del (WL *head, WL elem)
1531 {
1532 while (*head)
1533 {
1534 if (*head == elem)
1535 {
1536 *head = elem->next;
1537 return;
1538 }
1539
1540 head = &(*head)->next;
1541 }
1542 }
1543
1544 void inline_speed
1545 clear_pending (EV_P_ W w)
1546 {
1547 if (w->pending)
1548 {
1549 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1550 w->pending = 0;
1551 }
1552 }
1553
1554 int
1555 ev_clear_pending (EV_P_ void *w)
1556 {
1557 W w_ = (W)w;
1558 int pending = w_->pending;
1559
1560 if (expect_true (pending))
1561 {
1562 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1563 w_->pending = 0;
1564 p->w = 0;
1565 return p->events;
1566 }
1567 else
1568 return 0;
1569 }
1570
1571 void inline_size
1572 pri_adjust (EV_P_ W w)
1573 {
1574 int pri = w->priority;
1575 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1576 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1577 w->priority = pri;
1578 }
1579
1580 void inline_speed
1581 ev_start (EV_P_ W w, int active)
1582 {
1583 pri_adjust (EV_A_ w);
1584 w->active = active;
1585 ev_ref (EV_A);
1586 }
1587
1588 void inline_size
1589 ev_stop (EV_P_ W w)
1590 {
1591 ev_unref (EV_A);
1592 w->active = 0;
1593 }
1594
1595 /*****************************************************************************/
1596
1597 void noinline
1598 ev_io_start (EV_P_ ev_io *w)
1599 {
1600 int fd = w->fd;
1601
1602 if (expect_false (ev_is_active (w)))
1603 return;
1604
1605 assert (("ev_io_start called with negative fd", fd >= 0));
1606
1607 ev_start (EV_A_ (W)w, 1);
1608 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1609 wlist_add (&anfds[fd].head, (WL)w);
1610
1611 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
1612 w->events &= ~EV_IOFDSET;
1613 }
1614
1615 void noinline
1616 ev_io_stop (EV_P_ ev_io *w)
1617 {
1618 clear_pending (EV_A_ (W)w);
1619 if (expect_false (!ev_is_active (w)))
1620 return;
1621
1622 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1623
1624 wlist_del (&anfds[w->fd].head, (WL)w);
1625 ev_stop (EV_A_ (W)w);
1626
1627 fd_change (EV_A_ w->fd, 1);
1628 }
1629
1630 void noinline
1631 ev_timer_start (EV_P_ ev_timer *w)
1632 {
1633 if (expect_false (ev_is_active (w)))
1634 return;
1635
1636 ((WT)w)->at += mn_now;
1637
1638 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1639
1640 ev_start (EV_A_ (W)w, ++timercnt);
1641 array_needsize (WT, timers, timermax, timercnt, EMPTY2);
1642 timers [timercnt - 1] = (WT)w;
1643 upheap (timers, timercnt - 1);
1644
1645 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1646 }
1647
1648 void noinline
1649 ev_timer_stop (EV_P_ ev_timer *w)
1650 {
1651 clear_pending (EV_A_ (W)w);
1652 if (expect_false (!ev_is_active (w)))
1653 return;
1654
1655 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
1656
1657 {
1658 int active = ((W)w)->active;
1659
1660 if (expect_true (--active < --timercnt))
1661 {
1662 timers [active] = timers [timercnt];
1663 adjustheap (timers, timercnt, active);
1664 }
1665 }
1666
1667 ((WT)w)->at -= mn_now;
1668
1669 ev_stop (EV_A_ (W)w);
1670 }
1671
1672 void noinline
1673 ev_timer_again (EV_P_ ev_timer *w)
1674 {
1675 if (ev_is_active (w))
1676 {
1677 if (w->repeat)
1678 {
1679 ((WT)w)->at = mn_now + w->repeat;
1680 adjustheap (timers, timercnt, ((W)w)->active - 1);
1681 }
1682 else
1683 ev_timer_stop (EV_A_ w);
1684 }
1685 else if (w->repeat)
1686 {
1687 w->at = w->repeat;
1688 ev_timer_start (EV_A_ w);
1689 }
1690 }
1691
1692 #if EV_PERIODIC_ENABLE
1693 void noinline
1694 ev_periodic_start (EV_P_ ev_periodic *w)
1695 {
1696 if (expect_false (ev_is_active (w)))
1697 return;
1698
1699 if (w->reschedule_cb)
1700 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1701 else if (w->interval)
1702 {
1703 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1704 /* this formula differs from the one in periodic_reify because we do not always round up */
1705 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1706 }
1707 else
1708 ((WT)w)->at = w->offset;
1709
1710 ev_start (EV_A_ (W)w, ++periodiccnt);
1711 array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
1712 periodics [periodiccnt - 1] = (WT)w;
1713 upheap (periodics, periodiccnt - 1);
1714
1715 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1716 }
1717
1718 void noinline
1719 ev_periodic_stop (EV_P_ ev_periodic *w)
1720 {
1721 clear_pending (EV_A_ (W)w);
1722 if (expect_false (!ev_is_active (w)))
1723 return;
1724
1725 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
1726
1727 {
1728 int active = ((W)w)->active;
1729
1730 if (expect_true (--active < --periodiccnt))
1731 {
1732 periodics [active] = periodics [periodiccnt];
1733 adjustheap (periodics, periodiccnt, active);
1734 }
1735 }
1736
1737 ev_stop (EV_A_ (W)w);
1738 }
1739
1740 void noinline
1741 ev_periodic_again (EV_P_ ev_periodic *w)
1742 {
1743 /* TODO: use adjustheap and recalculation */
1744 ev_periodic_stop (EV_A_ w);
1745 ev_periodic_start (EV_A_ w);
1746 }
1747 #endif
1748
1749 #ifndef SA_RESTART
1750 # define SA_RESTART 0
1751 #endif
1752
1753 void noinline
1754 ev_signal_start (EV_P_ ev_signal *w)
1755 {
1756 #if EV_MULTIPLICITY
1757 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1758 #endif
1759 if (expect_false (ev_is_active (w)))
1760 return;
1761
1762 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1763
1764 {
1765 #ifndef _WIN32
1766 sigset_t full, prev;
1767 sigfillset (&full);
1768 sigprocmask (SIG_SETMASK, &full, &prev);
1769 #endif
1770
1771 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1772
1773 #ifndef _WIN32
1774 sigprocmask (SIG_SETMASK, &prev, 0);
1775 #endif
1776 }
1777
1778 ev_start (EV_A_ (W)w, 1);
1779 wlist_add (&signals [w->signum - 1].head, (WL)w);
1780
1781 if (!((WL)w)->next)
1782 {
1783 #if _WIN32
1784 signal (w->signum, sighandler);
1785 #else
1786 struct sigaction sa;
1787 sa.sa_handler = sighandler;
1788 sigfillset (&sa.sa_mask);
1789 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1790 sigaction (w->signum, &sa, 0);
1791 #endif
1792 }
1793 }
1794
1795 void noinline
1796 ev_signal_stop (EV_P_ ev_signal *w)
1797 {
1798 clear_pending (EV_A_ (W)w);
1799 if (expect_false (!ev_is_active (w)))
1800 return;
1801
1802 wlist_del (&signals [w->signum - 1].head, (WL)w);
1803 ev_stop (EV_A_ (W)w);
1804
1805 if (!signals [w->signum - 1].head)
1806 signal (w->signum, SIG_DFL);
1807 }
1808
1809 void
1810 ev_child_start (EV_P_ ev_child *w)
1811 {
1812 #if EV_MULTIPLICITY
1813 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1814 #endif
1815 if (expect_false (ev_is_active (w)))
1816 return;
1817
1818 ev_start (EV_A_ (W)w, 1);
1819 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1820 }
1821
1822 void
1823 ev_child_stop (EV_P_ ev_child *w)
1824 {
1825 clear_pending (EV_A_ (W)w);
1826 if (expect_false (!ev_is_active (w)))
1827 return;
1828
1829 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1830 ev_stop (EV_A_ (W)w);
1831 }
1832
1833 #if EV_STAT_ENABLE
1834
1835 # ifdef _WIN32
1836 # undef lstat
1837 # define lstat(a,b) _stati64 (a,b)
1838 # endif
1839
1840 #define DEF_STAT_INTERVAL 5.0074891
1841 #define MIN_STAT_INTERVAL 0.1074891
1842
1843 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
1844
1845 #if EV_USE_INOTIFY
1846 # define EV_INOTIFY_BUFSIZE 8192
1847
1848 static void noinline
1849 infy_add (EV_P_ ev_stat *w)
1850 {
1851 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);
1852
1853 if (w->wd < 0)
1854 {
1855 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
1856
1857 /* monitor some parent directory for speedup hints */
1858 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
1859 {
1860 char path [4096];
1861 strcpy (path, w->path);
1862
1863 do
1864 {
1865 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
1866 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
1867
1868 char *pend = strrchr (path, '/');
1869
1870 if (!pend)
1871 break; /* whoops, no '/', complain to your admin */
1872
1873 *pend = 0;
1874 w->wd = inotify_add_watch (fs_fd, path, mask);
1875 }
1876 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
1877 }
1878 }
1879 else
1880 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
1881
1882 if (w->wd >= 0)
1883 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
1884 }
1885
1886 static void noinline
1887 infy_del (EV_P_ ev_stat *w)
1888 {
1889 int slot;
1890 int wd = w->wd;
1891
1892 if (wd < 0)
1893 return;
1894
1895 w->wd = -2;
1896 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
1897 wlist_del (&fs_hash [slot].head, (WL)w);
1898
1899 /* remove this watcher, if others are watching it, they will rearm */
1900 inotify_rm_watch (fs_fd, wd);
1901 }
1902
1903 static void noinline
1904 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
1905 {
1906 if (slot < 0)
1907 /* overflow, need to check for all hahs slots */
1908 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1909 infy_wd (EV_A_ slot, wd, ev);
1910 else
1911 {
1912 WL w_;
1913
1914 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
1915 {
1916 ev_stat *w = (ev_stat *)w_;
1917 w_ = w_->next; /* lets us remove this watcher and all before it */
1918
1919 if (w->wd == wd || wd == -1)
1920 {
1921 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
1922 {
1923 w->wd = -1;
1924 infy_add (EV_A_ w); /* re-add, no matter what */
1925 }
1926
1927 stat_timer_cb (EV_A_ &w->timer, 0);
1928 }
1929 }
1930 }
1931 }
1932
1933 static void
1934 infy_cb (EV_P_ ev_io *w, int revents)
1935 {
1936 char buf [EV_INOTIFY_BUFSIZE];
1937 struct inotify_event *ev = (struct inotify_event *)buf;
1938 int ofs;
1939 int len = read (fs_fd, buf, sizeof (buf));
1940
1941 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
1942 infy_wd (EV_A_ ev->wd, ev->wd, ev);
1943 }
1944
1945 void inline_size
1946 infy_init (EV_P)
1947 {
1948 if (fs_fd != -2)
1949 return;
1950
1951 fs_fd = inotify_init ();
1952
1953 if (fs_fd >= 0)
1954 {
1955 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
1956 ev_set_priority (&fs_w, EV_MAXPRI);
1957 ev_io_start (EV_A_ &fs_w);
1958 }
1959 }
1960
1961 void inline_size
1962 infy_fork (EV_P)
1963 {
1964 int slot;
1965
1966 if (fs_fd < 0)
1967 return;
1968
1969 close (fs_fd);
1970 fs_fd = inotify_init ();
1971
1972 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1973 {
1974 WL w_ = fs_hash [slot].head;
1975 fs_hash [slot].head = 0;
1976
1977 while (w_)
1978 {
1979 ev_stat *w = (ev_stat *)w_;
1980 w_ = w_->next; /* lets us add this watcher */
1981
1982 w->wd = -1;
1983
1984 if (fs_fd >= 0)
1985 infy_add (EV_A_ w); /* re-add, no matter what */
1986 else
1987 ev_timer_start (EV_A_ &w->timer);
1988 }
1989
1990 }
1991 }
1992
1993 #endif
1994
1995 void
1996 ev_stat_stat (EV_P_ ev_stat *w)
1997 {
1998 if (lstat (w->path, &w->attr) < 0)
1999 w->attr.st_nlink = 0;
2000 else if (!w->attr.st_nlink)
2001 w->attr.st_nlink = 1;
2002 }
2003
2004 static void noinline
2005 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2006 {
2007 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2008
2009 /* we copy this here each the time so that */
2010 /* prev has the old value when the callback gets invoked */
2011 w->prev = w->attr;
2012 ev_stat_stat (EV_A_ w);
2013
2014 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2015 if (
2016 w->prev.st_dev != w->attr.st_dev
2017 || w->prev.st_ino != w->attr.st_ino
2018 || w->prev.st_mode != w->attr.st_mode
2019 || w->prev.st_nlink != w->attr.st_nlink
2020 || w->prev.st_uid != w->attr.st_uid
2021 || w->prev.st_gid != w->attr.st_gid
2022 || w->prev.st_rdev != w->attr.st_rdev
2023 || w->prev.st_size != w->attr.st_size
2024 || w->prev.st_atime != w->attr.st_atime
2025 || w->prev.st_mtime != w->attr.st_mtime
2026 || w->prev.st_ctime != w->attr.st_ctime
2027 ) {
2028 #if EV_USE_INOTIFY
2029 infy_del (EV_A_ w);
2030 infy_add (EV_A_ w);
2031 ev_stat_stat (EV_A_ w); /* avoid race... */
2032 #endif
2033
2034 ev_feed_event (EV_A_ w, EV_STAT);
2035 }
2036 }
2037
2038 void
2039 ev_stat_start (EV_P_ ev_stat *w)
2040 {
2041 if (expect_false (ev_is_active (w)))
2042 return;
2043
2044 /* since we use memcmp, we need to clear any padding data etc. */
2045 memset (&w->prev, 0, sizeof (ev_statdata));
2046 memset (&w->attr, 0, sizeof (ev_statdata));
2047
2048 ev_stat_stat (EV_A_ w);
2049
2050 if (w->interval < MIN_STAT_INTERVAL)
2051 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2052
2053 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2054 ev_set_priority (&w->timer, ev_priority (w));
2055
2056 #if EV_USE_INOTIFY
2057 infy_init (EV_A);
2058
2059 if (fs_fd >= 0)
2060 infy_add (EV_A_ w);
2061 else
2062 #endif
2063 ev_timer_start (EV_A_ &w->timer);
2064
2065 ev_start (EV_A_ (W)w, 1);
2066 }
2067
2068 void
2069 ev_stat_stop (EV_P_ ev_stat *w)
2070 {
2071 clear_pending (EV_A_ (W)w);
2072 if (expect_false (!ev_is_active (w)))
2073 return;
2074
2075 #if EV_USE_INOTIFY
2076 infy_del (EV_A_ w);
2077 #endif
2078 ev_timer_stop (EV_A_ &w->timer);
2079
2080 ev_stop (EV_A_ (W)w);
2081 }
2082 #endif
2083
2084 #if EV_IDLE_ENABLE
2085 void
2086 ev_idle_start (EV_P_ ev_idle *w)
2087 {
2088 if (expect_false (ev_is_active (w)))
2089 return;
2090
2091 pri_adjust (EV_A_ (W)w);
2092
2093 {
2094 int active = ++idlecnt [ABSPRI (w)];
2095
2096 ++idleall;
2097 ev_start (EV_A_ (W)w, active);
2098
2099 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2100 idles [ABSPRI (w)][active - 1] = w;
2101 }
2102 }
2103
2104 void
2105 ev_idle_stop (EV_P_ ev_idle *w)
2106 {
2107 clear_pending (EV_A_ (W)w);
2108 if (expect_false (!ev_is_active (w)))
2109 return;
2110
2111 {
2112 int active = ((W)w)->active;
2113
2114 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2115 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2116
2117 ev_stop (EV_A_ (W)w);
2118 --idleall;
2119 }
2120 }
2121 #endif
2122
2123 void
2124 ev_prepare_start (EV_P_ ev_prepare *w)
2125 {
2126 if (expect_false (ev_is_active (w)))
2127 return;
2128
2129 ev_start (EV_A_ (W)w, ++preparecnt);
2130 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2131 prepares [preparecnt - 1] = w;
2132 }
2133
2134 void
2135 ev_prepare_stop (EV_P_ ev_prepare *w)
2136 {
2137 clear_pending (EV_A_ (W)w);
2138 if (expect_false (!ev_is_active (w)))
2139 return;
2140
2141 {
2142 int active = ((W)w)->active;
2143 prepares [active - 1] = prepares [--preparecnt];
2144 ((W)prepares [active - 1])->active = active;
2145 }
2146
2147 ev_stop (EV_A_ (W)w);
2148 }
2149
2150 void
2151 ev_check_start (EV_P_ ev_check *w)
2152 {
2153 if (expect_false (ev_is_active (w)))
2154 return;
2155
2156 ev_start (EV_A_ (W)w, ++checkcnt);
2157 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2158 checks [checkcnt - 1] = w;
2159 }
2160
2161 void
2162 ev_check_stop (EV_P_ ev_check *w)
2163 {
2164 clear_pending (EV_A_ (W)w);
2165 if (expect_false (!ev_is_active (w)))
2166 return;
2167
2168 {
2169 int active = ((W)w)->active;
2170 checks [active - 1] = checks [--checkcnt];
2171 ((W)checks [active - 1])->active = active;
2172 }
2173
2174 ev_stop (EV_A_ (W)w);
2175 }
2176
2177 #if EV_EMBED_ENABLE
2178 void noinline
2179 ev_embed_sweep (EV_P_ ev_embed *w)
2180 {
2181 ev_loop (w->loop, EVLOOP_NONBLOCK);
2182 }
2183
2184 static void
2185 embed_cb (EV_P_ ev_io *io, int revents)
2186 {
2187 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2188
2189 if (ev_cb (w))
2190 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2191 else
2192 ev_embed_sweep (loop, w);
2193 }
2194
2195 void
2196 ev_embed_start (EV_P_ ev_embed *w)
2197 {
2198 if (expect_false (ev_is_active (w)))
2199 return;
2200
2201 {
2202 struct ev_loop *loop = w->loop;
2203 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2204 ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
2205 }
2206
2207 ev_set_priority (&w->io, ev_priority (w));
2208 ev_io_start (EV_A_ &w->io);
2209
2210 ev_start (EV_A_ (W)w, 1);
2211 }
2212
2213 void
2214 ev_embed_stop (EV_P_ ev_embed *w)
2215 {
2216 clear_pending (EV_A_ (W)w);
2217 if (expect_false (!ev_is_active (w)))
2218 return;
2219
2220 ev_io_stop (EV_A_ &w->io);
2221
2222 ev_stop (EV_A_ (W)w);
2223 }
2224 #endif
2225
2226 #if EV_FORK_ENABLE
2227 void
2228 ev_fork_start (EV_P_ ev_fork *w)
2229 {
2230 if (expect_false (ev_is_active (w)))
2231 return;
2232
2233 ev_start (EV_A_ (W)w, ++forkcnt);
2234 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2235 forks [forkcnt - 1] = w;
2236 }
2237
2238 void
2239 ev_fork_stop (EV_P_ ev_fork *w)
2240 {
2241 clear_pending (EV_A_ (W)w);
2242 if (expect_false (!ev_is_active (w)))
2243 return;
2244
2245 {
2246 int active = ((W)w)->active;
2247 forks [active - 1] = forks [--forkcnt];
2248 ((W)forks [active - 1])->active = active;
2249 }
2250
2251 ev_stop (EV_A_ (W)w);
2252 }
2253 #endif
2254
2255 /*****************************************************************************/
2256
2257 struct ev_once
2258 {
2259 ev_io io;
2260 ev_timer to;
2261 void (*cb)(int revents, void *arg);
2262 void *arg;
2263 };
2264
2265 static void
2266 once_cb (EV_P_ struct ev_once *once, int revents)
2267 {
2268 void (*cb)(int revents, void *arg) = once->cb;
2269 void *arg = once->arg;
2270
2271 ev_io_stop (EV_A_ &once->io);
2272 ev_timer_stop (EV_A_ &once->to);
2273 ev_free (once);
2274
2275 cb (revents, arg);
2276 }
2277
2278 static void
2279 once_cb_io (EV_P_ ev_io *w, int revents)
2280 {
2281 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2282 }
2283
2284 static void
2285 once_cb_to (EV_P_ ev_timer *w, int revents)
2286 {
2287 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2288 }
2289
2290 void
2291 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2292 {
2293 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2294
2295 if (expect_false (!once))
2296 {
2297 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2298 return;
2299 }
2300
2301 once->cb = cb;
2302 once->arg = arg;
2303
2304 ev_init (&once->io, once_cb_io);
2305 if (fd >= 0)
2306 {
2307 ev_io_set (&once->io, fd, events);
2308 ev_io_start (EV_A_ &once->io);
2309 }
2310
2311 ev_init (&once->to, once_cb_to);
2312 if (timeout >= 0.)
2313 {
2314 ev_timer_set (&once->to, timeout, 0.);
2315 ev_timer_start (EV_A_ &once->to);
2316 }
2317 }
2318
2319 #ifdef __cplusplus
2320 }
2321 #endif
2322