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Revision: 1.167
Committed: Sat Dec 8 04:02:31 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.166: +8 -10 lines
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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 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
222 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
223 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
224
225 #if __GNUC__ >= 3
226 # define expect(expr,value) __builtin_expect ((expr),(value))
227 # define inline_size static inline /* inline for codesize */
228 # if EV_MINIMAL
229 # define noinline __attribute__ ((noinline))
230 # define inline_speed static noinline
231 # else
232 # define noinline
233 # define inline_speed static inline
234 # endif
235 #else
236 # define expect(expr,value) (expr)
237 # define inline_speed static
238 # define inline_size static
239 # define noinline
240 #endif
241
242 #define expect_false(expr) expect ((expr) != 0, 0)
243 #define expect_true(expr) expect ((expr) != 0, 1)
244
245 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
246 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
247
248 #define EMPTY /* required for microsofts broken pseudo-c compiler */
249 #define EMPTY2(a,b) /* used to suppress some warnings */
250
251 typedef ev_watcher *W;
252 typedef ev_watcher_list *WL;
253 typedef ev_watcher_time *WT;
254
255 static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
256
257 #ifdef _WIN32
258 # include "ev_win32.c"
259 #endif
260
261 /*****************************************************************************/
262
263 static void (*syserr_cb)(const char *msg);
264
265 void
266 ev_set_syserr_cb (void (*cb)(const char *msg))
267 {
268 syserr_cb = cb;
269 }
270
271 static void noinline
272 syserr (const char *msg)
273 {
274 if (!msg)
275 msg = "(libev) system error";
276
277 if (syserr_cb)
278 syserr_cb (msg);
279 else
280 {
281 perror (msg);
282 abort ();
283 }
284 }
285
286 static void *(*alloc)(void *ptr, long size);
287
288 void
289 ev_set_allocator (void *(*cb)(void *ptr, long size))
290 {
291 alloc = cb;
292 }
293
294 inline_speed void *
295 ev_realloc (void *ptr, long size)
296 {
297 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
298
299 if (!ptr && size)
300 {
301 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
302 abort ();
303 }
304
305 return ptr;
306 }
307
308 #define ev_malloc(size) ev_realloc (0, (size))
309 #define ev_free(ptr) ev_realloc ((ptr), 0)
310
311 /*****************************************************************************/
312
313 typedef struct
314 {
315 WL head;
316 unsigned char events;
317 unsigned char reify;
318 #if EV_SELECT_IS_WINSOCKET
319 SOCKET handle;
320 #endif
321 } ANFD;
322
323 typedef struct
324 {
325 W w;
326 int events;
327 } ANPENDING;
328
329 #if EV_USE_INOTIFY
330 typedef struct
331 {
332 WL head;
333 } ANFS;
334 #endif
335
336 #if EV_MULTIPLICITY
337
338 struct ev_loop
339 {
340 ev_tstamp ev_rt_now;
341 #define ev_rt_now ((loop)->ev_rt_now)
342 #define VAR(name,decl) decl;
343 #include "ev_vars.h"
344 #undef VAR
345 };
346 #include "ev_wrap.h"
347
348 static struct ev_loop default_loop_struct;
349 struct ev_loop *ev_default_loop_ptr;
350
351 #else
352
353 ev_tstamp ev_rt_now;
354 #define VAR(name,decl) static decl;
355 #include "ev_vars.h"
356 #undef VAR
357
358 static int ev_default_loop_ptr;
359
360 #endif
361
362 /*****************************************************************************/
363
364 ev_tstamp
365 ev_time (void)
366 {
367 #if EV_USE_REALTIME
368 struct timespec ts;
369 clock_gettime (CLOCK_REALTIME, &ts);
370 return ts.tv_sec + ts.tv_nsec * 1e-9;
371 #else
372 struct timeval tv;
373 gettimeofday (&tv, 0);
374 return tv.tv_sec + tv.tv_usec * 1e-6;
375 #endif
376 }
377
378 ev_tstamp inline_size
379 get_clock (void)
380 {
381 #if EV_USE_MONOTONIC
382 if (expect_true (have_monotonic))
383 {
384 struct timespec ts;
385 clock_gettime (CLOCK_MONOTONIC, &ts);
386 return ts.tv_sec + ts.tv_nsec * 1e-9;
387 }
388 #endif
389
390 return ev_time ();
391 }
392
393 #if EV_MULTIPLICITY
394 ev_tstamp
395 ev_now (EV_P)
396 {
397 return ev_rt_now;
398 }
399 #endif
400
401 int inline_size
402 array_nextsize (int elem, int cur, int cnt)
403 {
404 int ncur = cur + 1;
405
406 do
407 ncur <<= 1;
408 while (cnt > ncur);
409
410 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
411 if (elem * ncur > 4096)
412 {
413 ncur *= elem;
414 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
415 ncur = ncur - sizeof (void *) * 4;
416 ncur /= elem;
417 }
418
419 return ncur;
420 }
421
422 inline_speed void *
423 array_realloc (int elem, void *base, int *cur, int cnt)
424 {
425 *cur = array_nextsize (elem, *cur, cnt);
426 return ev_realloc (base, elem * *cur);
427 }
428
429 #define array_needsize(type,base,cur,cnt,init) \
430 if (expect_false ((cnt) > (cur))) \
431 { \
432 int ocur_ = (cur); \
433 (base) = (type *)array_realloc \
434 (sizeof (type), (base), &(cur), (cnt)); \
435 init ((base) + (ocur_), (cur) - ocur_); \
436 }
437
438 #if 0
439 #define array_slim(type,stem) \
440 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
441 { \
442 stem ## max = array_roundsize (stem ## cnt >> 1); \
443 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
444 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
445 }
446 #endif
447
448 #define array_free(stem, idx) \
449 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
450
451 /*****************************************************************************/
452
453 void noinline
454 ev_feed_event (EV_P_ void *w, int revents)
455 {
456 W w_ = (W)w;
457
458 if (expect_false (w_->pending))
459 {
460 pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
461 return;
462 }
463
464 w_->pending = ++pendingcnt [ABSPRI (w_)];
465 array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
466 pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
467 pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
468 }
469
470 void inline_size
471 queue_events (EV_P_ W *events, int eventcnt, int type)
472 {
473 int i;
474
475 for (i = 0; i < eventcnt; ++i)
476 ev_feed_event (EV_A_ events [i], type);
477 }
478
479 /*****************************************************************************/
480
481 void inline_size
482 anfds_init (ANFD *base, int count)
483 {
484 while (count--)
485 {
486 base->head = 0;
487 base->events = EV_NONE;
488 base->reify = 0;
489
490 ++base;
491 }
492 }
493
494 void inline_speed
495 fd_event (EV_P_ int fd, int revents)
496 {
497 ANFD *anfd = anfds + fd;
498 ev_io *w;
499
500 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
501 {
502 int ev = w->events & revents;
503
504 if (ev)
505 ev_feed_event (EV_A_ (W)w, ev);
506 }
507 }
508
509 void
510 ev_feed_fd_event (EV_P_ int fd, int revents)
511 {
512 fd_event (EV_A_ fd, revents);
513 }
514
515 void inline_size
516 fd_reify (EV_P)
517 {
518 int i;
519
520 for (i = 0; i < fdchangecnt; ++i)
521 {
522 int fd = fdchanges [i];
523 ANFD *anfd = anfds + fd;
524 ev_io *w;
525
526 int events = 0;
527
528 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
529 events |= w->events;
530
531 #if EV_SELECT_IS_WINSOCKET
532 if (events)
533 {
534 unsigned long argp;
535 anfd->handle = _get_osfhandle (fd);
536 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
537 }
538 #endif
539
540 anfd->reify = 0;
541
542 backend_modify (EV_A_ fd, anfd->events, events);
543 anfd->events = events;
544 }
545
546 fdchangecnt = 0;
547 }
548
549 void inline_size
550 fd_change (EV_P_ int fd)
551 {
552 if (expect_false (anfds [fd].reify))
553 return;
554
555 anfds [fd].reify = 1;
556
557 ++fdchangecnt;
558 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
559 fdchanges [fdchangecnt - 1] = fd;
560 }
561
562 void inline_speed
563 fd_kill (EV_P_ int fd)
564 {
565 ev_io *w;
566
567 while ((w = (ev_io *)anfds [fd].head))
568 {
569 ev_io_stop (EV_A_ w);
570 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
571 }
572 }
573
574 int inline_size
575 fd_valid (int fd)
576 {
577 #ifdef _WIN32
578 return _get_osfhandle (fd) != -1;
579 #else
580 return fcntl (fd, F_GETFD) != -1;
581 #endif
582 }
583
584 /* called on EBADF to verify fds */
585 static void noinline
586 fd_ebadf (EV_P)
587 {
588 int fd;
589
590 for (fd = 0; fd < anfdmax; ++fd)
591 if (anfds [fd].events)
592 if (!fd_valid (fd) == -1 && errno == EBADF)
593 fd_kill (EV_A_ fd);
594 }
595
596 /* called on ENOMEM in select/poll to kill some fds and retry */
597 static void noinline
598 fd_enomem (EV_P)
599 {
600 int fd;
601
602 for (fd = anfdmax; fd--; )
603 if (anfds [fd].events)
604 {
605 fd_kill (EV_A_ fd);
606 return;
607 }
608 }
609
610 /* usually called after fork if backend needs to re-arm all fds from scratch */
611 static void noinline
612 fd_rearm_all (EV_P)
613 {
614 int fd;
615
616 for (fd = 0; fd < anfdmax; ++fd)
617 if (anfds [fd].events)
618 {
619 anfds [fd].events = 0;
620 fd_change (EV_A_ fd);
621 }
622 }
623
624 /*****************************************************************************/
625
626 void inline_speed
627 upheap (WT *heap, int k)
628 {
629 WT w = heap [k];
630
631 while (k && heap [k >> 1]->at > w->at)
632 {
633 heap [k] = heap [k >> 1];
634 ((W)heap [k])->active = k + 1;
635 k >>= 1;
636 }
637
638 heap [k] = w;
639 ((W)heap [k])->active = k + 1;
640
641 }
642
643 void inline_speed
644 downheap (WT *heap, int N, int k)
645 {
646 WT w = heap [k];
647
648 while (k < (N >> 1))
649 {
650 int j = k << 1;
651
652 if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
653 ++j;
654
655 if (w->at <= heap [j]->at)
656 break;
657
658 heap [k] = heap [j];
659 ((W)heap [k])->active = k + 1;
660 k = j;
661 }
662
663 heap [k] = w;
664 ((W)heap [k])->active = k + 1;
665 }
666
667 void inline_size
668 adjustheap (WT *heap, int N, int k)
669 {
670 upheap (heap, k);
671 downheap (heap, N, k);
672 }
673
674 /*****************************************************************************/
675
676 typedef struct
677 {
678 WL head;
679 sig_atomic_t volatile gotsig;
680 } ANSIG;
681
682 static ANSIG *signals;
683 static int signalmax;
684
685 static int sigpipe [2];
686 static sig_atomic_t volatile gotsig;
687 static ev_io sigev;
688
689 void inline_size
690 signals_init (ANSIG *base, int count)
691 {
692 while (count--)
693 {
694 base->head = 0;
695 base->gotsig = 0;
696
697 ++base;
698 }
699 }
700
701 static void
702 sighandler (int signum)
703 {
704 #if _WIN32
705 signal (signum, sighandler);
706 #endif
707
708 signals [signum - 1].gotsig = 1;
709
710 if (!gotsig)
711 {
712 int old_errno = errno;
713 gotsig = 1;
714 write (sigpipe [1], &signum, 1);
715 errno = old_errno;
716 }
717 }
718
719 void noinline
720 ev_feed_signal_event (EV_P_ int signum)
721 {
722 WL w;
723
724 #if EV_MULTIPLICITY
725 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
726 #endif
727
728 --signum;
729
730 if (signum < 0 || signum >= signalmax)
731 return;
732
733 signals [signum].gotsig = 0;
734
735 for (w = signals [signum].head; w; w = w->next)
736 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
737 }
738
739 static void
740 sigcb (EV_P_ ev_io *iow, int revents)
741 {
742 int signum;
743
744 read (sigpipe [0], &revents, 1);
745 gotsig = 0;
746
747 for (signum = signalmax; signum--; )
748 if (signals [signum].gotsig)
749 ev_feed_signal_event (EV_A_ signum + 1);
750 }
751
752 void inline_size
753 fd_intern (int fd)
754 {
755 #ifdef _WIN32
756 int arg = 1;
757 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
758 #else
759 fcntl (fd, F_SETFD, FD_CLOEXEC);
760 fcntl (fd, F_SETFL, O_NONBLOCK);
761 #endif
762 }
763
764 static void noinline
765 siginit (EV_P)
766 {
767 fd_intern (sigpipe [0]);
768 fd_intern (sigpipe [1]);
769
770 ev_io_set (&sigev, sigpipe [0], EV_READ);
771 ev_io_start (EV_A_ &sigev);
772 ev_unref (EV_A); /* child watcher should not keep loop alive */
773 }
774
775 /*****************************************************************************/
776
777 static ev_child *childs [EV_PID_HASHSIZE];
778
779 #ifndef _WIN32
780
781 static ev_signal childev;
782
783 void inline_speed
784 child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
785 {
786 ev_child *w;
787
788 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
789 if (w->pid == pid || !w->pid)
790 {
791 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
792 w->rpid = pid;
793 w->rstatus = status;
794 ev_feed_event (EV_A_ (W)w, EV_CHILD);
795 }
796 }
797
798 #ifndef WCONTINUED
799 # define WCONTINUED 0
800 #endif
801
802 static void
803 childcb (EV_P_ ev_signal *sw, int revents)
804 {
805 int pid, status;
806
807 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
808 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
809 if (!WCONTINUED
810 || errno != EINVAL
811 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
812 return;
813
814 /* make sure we are called again until all childs have been reaped */
815 /* we need to do it this way so that the callback gets called before we continue */
816 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
817
818 child_reap (EV_A_ sw, pid, pid, status);
819 if (EV_PID_HASHSIZE > 1)
820 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
821 }
822
823 #endif
824
825 /*****************************************************************************/
826
827 #if EV_USE_PORT
828 # include "ev_port.c"
829 #endif
830 #if EV_USE_KQUEUE
831 # include "ev_kqueue.c"
832 #endif
833 #if EV_USE_EPOLL
834 # include "ev_epoll.c"
835 #endif
836 #if EV_USE_POLL
837 # include "ev_poll.c"
838 #endif
839 #if EV_USE_SELECT
840 # include "ev_select.c"
841 #endif
842
843 int
844 ev_version_major (void)
845 {
846 return EV_VERSION_MAJOR;
847 }
848
849 int
850 ev_version_minor (void)
851 {
852 return EV_VERSION_MINOR;
853 }
854
855 /* return true if we are running with elevated privileges and should ignore env variables */
856 int inline_size
857 enable_secure (void)
858 {
859 #ifdef _WIN32
860 return 0;
861 #else
862 return getuid () != geteuid ()
863 || getgid () != getegid ();
864 #endif
865 }
866
867 unsigned int
868 ev_supported_backends (void)
869 {
870 unsigned int flags = 0;
871
872 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
873 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
874 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
875 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
876 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
877
878 return flags;
879 }
880
881 unsigned int
882 ev_recommended_backends (void)
883 {
884 unsigned int flags = ev_supported_backends ();
885
886 #ifndef __NetBSD__
887 /* kqueue is borked on everything but netbsd apparently */
888 /* it usually doesn't work correctly on anything but sockets and pipes */
889 flags &= ~EVBACKEND_KQUEUE;
890 #endif
891 #ifdef __APPLE__
892 // flags &= ~EVBACKEND_KQUEUE; for documentation
893 flags &= ~EVBACKEND_POLL;
894 #endif
895
896 return flags;
897 }
898
899 unsigned int
900 ev_embeddable_backends (void)
901 {
902 return EVBACKEND_EPOLL
903 | EVBACKEND_KQUEUE
904 | EVBACKEND_PORT;
905 }
906
907 unsigned int
908 ev_backend (EV_P)
909 {
910 return backend;
911 }
912
913 unsigned int
914 ev_loop_count (EV_P)
915 {
916 return loop_count;
917 }
918
919 static void noinline
920 loop_init (EV_P_ unsigned int flags)
921 {
922 if (!backend)
923 {
924 #if EV_USE_MONOTONIC
925 {
926 struct timespec ts;
927 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
928 have_monotonic = 1;
929 }
930 #endif
931
932 ev_rt_now = ev_time ();
933 mn_now = get_clock ();
934 now_floor = mn_now;
935 rtmn_diff = ev_rt_now - mn_now;
936
937 /* pid check not overridable via env */
938 #ifndef _WIN32
939 if (flags & EVFLAG_FORKCHECK)
940 curpid = getpid ();
941 #endif
942
943 if (!(flags & EVFLAG_NOENV)
944 && !enable_secure ()
945 && getenv ("LIBEV_FLAGS"))
946 flags = atoi (getenv ("LIBEV_FLAGS"));
947
948 if (!(flags & 0x0000ffffUL))
949 flags |= ev_recommended_backends ();
950
951 backend = 0;
952 backend_fd = -1;
953 #if EV_USE_INOTIFY
954 fs_fd = -2;
955 #endif
956
957 #if EV_USE_PORT
958 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
959 #endif
960 #if EV_USE_KQUEUE
961 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
962 #endif
963 #if EV_USE_EPOLL
964 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
965 #endif
966 #if EV_USE_POLL
967 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
968 #endif
969 #if EV_USE_SELECT
970 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
971 #endif
972
973 ev_init (&sigev, sigcb);
974 ev_set_priority (&sigev, EV_MAXPRI);
975 }
976 }
977
978 static void noinline
979 loop_destroy (EV_P)
980 {
981 int i;
982
983 #if EV_USE_INOTIFY
984 if (fs_fd >= 0)
985 close (fs_fd);
986 #endif
987
988 if (backend_fd >= 0)
989 close (backend_fd);
990
991 #if EV_USE_PORT
992 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
993 #endif
994 #if EV_USE_KQUEUE
995 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
996 #endif
997 #if EV_USE_EPOLL
998 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
999 #endif
1000 #if EV_USE_POLL
1001 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1002 #endif
1003 #if EV_USE_SELECT
1004 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1005 #endif
1006
1007 for (i = NUMPRI; i--; )
1008 {
1009 array_free (pending, [i]);
1010 #if EV_IDLE_ENABLE
1011 array_free (idle, [i]);
1012 #endif
1013 }
1014
1015 /* have to use the microsoft-never-gets-it-right macro */
1016 array_free (fdchange, EMPTY);
1017 array_free (timer, EMPTY);
1018 #if EV_PERIODIC_ENABLE
1019 array_free (periodic, EMPTY);
1020 #endif
1021 array_free (prepare, EMPTY);
1022 array_free (check, EMPTY);
1023
1024 backend = 0;
1025 }
1026
1027 void inline_size infy_fork (EV_P);
1028
1029 void inline_size
1030 loop_fork (EV_P)
1031 {
1032 #if EV_USE_PORT
1033 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1034 #endif
1035 #if EV_USE_KQUEUE
1036 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1037 #endif
1038 #if EV_USE_EPOLL
1039 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1040 #endif
1041 #if EV_USE_INOTIFY
1042 infy_fork (EV_A);
1043 #endif
1044
1045 if (ev_is_active (&sigev))
1046 {
1047 /* default loop */
1048
1049 ev_ref (EV_A);
1050 ev_io_stop (EV_A_ &sigev);
1051 close (sigpipe [0]);
1052 close (sigpipe [1]);
1053
1054 while (pipe (sigpipe))
1055 syserr ("(libev) error creating pipe");
1056
1057 siginit (EV_A);
1058 }
1059
1060 postfork = 0;
1061 }
1062
1063 #if EV_MULTIPLICITY
1064 struct ev_loop *
1065 ev_loop_new (unsigned int flags)
1066 {
1067 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1068
1069 memset (loop, 0, sizeof (struct ev_loop));
1070
1071 loop_init (EV_A_ flags);
1072
1073 if (ev_backend (EV_A))
1074 return loop;
1075
1076 return 0;
1077 }
1078
1079 void
1080 ev_loop_destroy (EV_P)
1081 {
1082 loop_destroy (EV_A);
1083 ev_free (loop);
1084 }
1085
1086 void
1087 ev_loop_fork (EV_P)
1088 {
1089 postfork = 1;
1090 }
1091
1092 #endif
1093
1094 #if EV_MULTIPLICITY
1095 struct ev_loop *
1096 ev_default_loop_init (unsigned int flags)
1097 #else
1098 int
1099 ev_default_loop (unsigned int flags)
1100 #endif
1101 {
1102 if (sigpipe [0] == sigpipe [1])
1103 if (pipe (sigpipe))
1104 return 0;
1105
1106 if (!ev_default_loop_ptr)
1107 {
1108 #if EV_MULTIPLICITY
1109 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1110 #else
1111 ev_default_loop_ptr = 1;
1112 #endif
1113
1114 loop_init (EV_A_ flags);
1115
1116 if (ev_backend (EV_A))
1117 {
1118 siginit (EV_A);
1119
1120 #ifndef _WIN32
1121 ev_signal_init (&childev, childcb, SIGCHLD);
1122 ev_set_priority (&childev, EV_MAXPRI);
1123 ev_signal_start (EV_A_ &childev);
1124 ev_unref (EV_A); /* child watcher should not keep loop alive */
1125 #endif
1126 }
1127 else
1128 ev_default_loop_ptr = 0;
1129 }
1130
1131 return ev_default_loop_ptr;
1132 }
1133
1134 void
1135 ev_default_destroy (void)
1136 {
1137 #if EV_MULTIPLICITY
1138 struct ev_loop *loop = ev_default_loop_ptr;
1139 #endif
1140
1141 #ifndef _WIN32
1142 ev_ref (EV_A); /* child watcher */
1143 ev_signal_stop (EV_A_ &childev);
1144 #endif
1145
1146 ev_ref (EV_A); /* signal watcher */
1147 ev_io_stop (EV_A_ &sigev);
1148
1149 close (sigpipe [0]); sigpipe [0] = 0;
1150 close (sigpipe [1]); sigpipe [1] = 0;
1151
1152 loop_destroy (EV_A);
1153 }
1154
1155 void
1156 ev_default_fork (void)
1157 {
1158 #if EV_MULTIPLICITY
1159 struct ev_loop *loop = ev_default_loop_ptr;
1160 #endif
1161
1162 if (backend)
1163 postfork = 1;
1164 }
1165
1166 /*****************************************************************************/
1167
1168 void inline_speed
1169 call_pending (EV_P)
1170 {
1171 int pri;
1172
1173 for (pri = NUMPRI; pri--; )
1174 while (pendingcnt [pri])
1175 {
1176 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1177
1178 if (expect_true (p->w))
1179 {
1180 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1181
1182 p->w->pending = 0;
1183 EV_CB_INVOKE (p->w, p->events);
1184 }
1185 }
1186 }
1187
1188 void inline_size
1189 timers_reify (EV_P)
1190 {
1191 while (timercnt && ((WT)timers [0])->at <= mn_now)
1192 {
1193 ev_timer *w = timers [0];
1194
1195 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1196
1197 /* first reschedule or stop timer */
1198 if (w->repeat)
1199 {
1200 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1201
1202 ((WT)w)->at += w->repeat;
1203 if (((WT)w)->at < mn_now)
1204 ((WT)w)->at = mn_now;
1205
1206 downheap ((WT *)timers, timercnt, 0);
1207 }
1208 else
1209 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1210
1211 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1212 }
1213 }
1214
1215 #if EV_PERIODIC_ENABLE
1216 void inline_size
1217 periodics_reify (EV_P)
1218 {
1219 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1220 {
1221 ev_periodic *w = periodics [0];
1222
1223 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1224
1225 /* first reschedule or stop timer */
1226 if (w->reschedule_cb)
1227 {
1228 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
1229 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1230 downheap ((WT *)periodics, periodiccnt, 0);
1231 }
1232 else if (w->interval)
1233 {
1234 ((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
1235 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1236 downheap ((WT *)periodics, periodiccnt, 0);
1237 }
1238 else
1239 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1240
1241 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1242 }
1243 }
1244
1245 static void noinline
1246 periodics_reschedule (EV_P)
1247 {
1248 int i;
1249
1250 /* adjust periodics after time jump */
1251 for (i = 0; i < periodiccnt; ++i)
1252 {
1253 ev_periodic *w = periodics [i];
1254
1255 if (w->reschedule_cb)
1256 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1257 else if (w->interval)
1258 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1259 }
1260
1261 /* now rebuild the heap */
1262 for (i = periodiccnt >> 1; i--; )
1263 downheap ((WT *)periodics, periodiccnt, i);
1264 }
1265 #endif
1266
1267 #if EV_IDLE_ENABLE
1268 void inline_size
1269 idle_reify (EV_P)
1270 {
1271 if (expect_false (idleall))
1272 {
1273 int pri;
1274
1275 for (pri = NUMPRI; pri--; )
1276 {
1277 if (pendingcnt [pri])
1278 break;
1279
1280 if (idlecnt [pri])
1281 {
1282 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1283 break;
1284 }
1285 }
1286 }
1287 }
1288 #endif
1289
1290 int inline_size
1291 time_update_monotonic (EV_P)
1292 {
1293 mn_now = get_clock ();
1294
1295 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1296 {
1297 ev_rt_now = rtmn_diff + mn_now;
1298 return 0;
1299 }
1300 else
1301 {
1302 now_floor = mn_now;
1303 ev_rt_now = ev_time ();
1304 return 1;
1305 }
1306 }
1307
1308 void inline_size
1309 time_update (EV_P)
1310 {
1311 int i;
1312
1313 #if EV_USE_MONOTONIC
1314 if (expect_true (have_monotonic))
1315 {
1316 if (time_update_monotonic (EV_A))
1317 {
1318 ev_tstamp odiff = rtmn_diff;
1319
1320 /* loop a few times, before making important decisions.
1321 * on the choice of "4": one iteration isn't enough,
1322 * in case we get preempted during the calls to
1323 * ev_time and get_clock. a second call is almost guaranteed
1324 * to succeed in that case, though. and looping a few more times
1325 * doesn't hurt either as we only do this on time-jumps or
1326 * in the unlikely event of having been preempted here.
1327 */
1328 for (i = 4; --i; )
1329 {
1330 rtmn_diff = ev_rt_now - mn_now;
1331
1332 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1333 return; /* all is well */
1334
1335 ev_rt_now = ev_time ();
1336 mn_now = get_clock ();
1337 now_floor = mn_now;
1338 }
1339
1340 # if EV_PERIODIC_ENABLE
1341 periodics_reschedule (EV_A);
1342 # endif
1343 /* no timer adjustment, as the monotonic clock doesn't jump */
1344 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1345 }
1346 }
1347 else
1348 #endif
1349 {
1350 ev_rt_now = ev_time ();
1351
1352 if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
1353 {
1354 #if EV_PERIODIC_ENABLE
1355 periodics_reschedule (EV_A);
1356 #endif
1357
1358 /* adjust timers. this is easy, as the offset is the same for all of them */
1359 for (i = 0; i < timercnt; ++i)
1360 ((WT)timers [i])->at += ev_rt_now - mn_now;
1361 }
1362
1363 mn_now = ev_rt_now;
1364 }
1365 }
1366
1367 void
1368 ev_ref (EV_P)
1369 {
1370 ++activecnt;
1371 }
1372
1373 void
1374 ev_unref (EV_P)
1375 {
1376 --activecnt;
1377 }
1378
1379 static int loop_done;
1380
1381 void
1382 ev_loop (EV_P_ int flags)
1383 {
1384 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1385 ? EVUNLOOP_ONE
1386 : EVUNLOOP_CANCEL;
1387
1388 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1389
1390 do
1391 {
1392 #ifndef _WIN32
1393 if (expect_false (curpid)) /* penalise the forking check even more */
1394 if (expect_false (getpid () != curpid))
1395 {
1396 curpid = getpid ();
1397 postfork = 1;
1398 }
1399 #endif
1400
1401 #if EV_FORK_ENABLE
1402 /* we might have forked, so queue fork handlers */
1403 if (expect_false (postfork))
1404 if (forkcnt)
1405 {
1406 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1407 call_pending (EV_A);
1408 }
1409 #endif
1410
1411 /* queue check watchers (and execute them) */
1412 if (expect_false (preparecnt))
1413 {
1414 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1415 call_pending (EV_A);
1416 }
1417
1418 if (expect_false (!activecnt))
1419 break;
1420
1421 /* we might have forked, so reify kernel state if necessary */
1422 if (expect_false (postfork))
1423 loop_fork (EV_A);
1424
1425 /* update fd-related kernel structures */
1426 fd_reify (EV_A);
1427
1428 /* calculate blocking time */
1429 {
1430 ev_tstamp block;
1431
1432 if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
1433 block = 0.; /* do not block at all */
1434 else
1435 {
1436 /* update time to cancel out callback processing overhead */
1437 #if EV_USE_MONOTONIC
1438 if (expect_true (have_monotonic))
1439 time_update_monotonic (EV_A);
1440 else
1441 #endif
1442 {
1443 ev_rt_now = ev_time ();
1444 mn_now = ev_rt_now;
1445 }
1446
1447 block = MAX_BLOCKTIME;
1448
1449 if (timercnt)
1450 {
1451 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1452 if (block > to) block = to;
1453 }
1454
1455 #if EV_PERIODIC_ENABLE
1456 if (periodiccnt)
1457 {
1458 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1459 if (block > to) block = to;
1460 }
1461 #endif
1462
1463 if (expect_false (block < 0.)) block = 0.;
1464 }
1465
1466 ++loop_count;
1467 backend_poll (EV_A_ block);
1468 }
1469
1470 /* update ev_rt_now, do magic */
1471 time_update (EV_A);
1472
1473 /* queue pending timers and reschedule them */
1474 timers_reify (EV_A); /* relative timers called last */
1475 #if EV_PERIODIC_ENABLE
1476 periodics_reify (EV_A); /* absolute timers called first */
1477 #endif
1478
1479 #if EV_IDLE_ENABLE
1480 /* queue idle watchers unless other events are pending */
1481 idle_reify (EV_A);
1482 #endif
1483
1484 /* queue check watchers, to be executed first */
1485 if (expect_false (checkcnt))
1486 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1487
1488 call_pending (EV_A);
1489
1490 }
1491 while (expect_true (activecnt && !loop_done));
1492
1493 if (loop_done == EVUNLOOP_ONE)
1494 loop_done = EVUNLOOP_CANCEL;
1495 }
1496
1497 void
1498 ev_unloop (EV_P_ int how)
1499 {
1500 loop_done = how;
1501 }
1502
1503 /*****************************************************************************/
1504
1505 void inline_size
1506 wlist_add (WL *head, WL elem)
1507 {
1508 elem->next = *head;
1509 *head = elem;
1510 }
1511
1512 void inline_size
1513 wlist_del (WL *head, WL elem)
1514 {
1515 while (*head)
1516 {
1517 if (*head == elem)
1518 {
1519 *head = elem->next;
1520 return;
1521 }
1522
1523 head = &(*head)->next;
1524 }
1525 }
1526
1527 void inline_speed
1528 clear_pending (EV_P_ W w)
1529 {
1530 if (w->pending)
1531 {
1532 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1533 w->pending = 0;
1534 }
1535 }
1536
1537 int
1538 ev_clear_pending (EV_P_ void *w)
1539 {
1540 W w_ = (W)w;
1541 int pending = w_->pending;
1542
1543 if (!pending)
1544 return 0;
1545
1546 w_->pending = 0;
1547 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1548 p->w = 0;
1549
1550 return p->events;
1551 }
1552
1553 void inline_size
1554 pri_adjust (EV_P_ W w)
1555 {
1556 int pri = w->priority;
1557 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1558 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1559 w->priority = pri;
1560 }
1561
1562 void inline_speed
1563 ev_start (EV_P_ W w, int active)
1564 {
1565 pri_adjust (EV_A_ w);
1566 w->active = active;
1567 ev_ref (EV_A);
1568 }
1569
1570 void inline_size
1571 ev_stop (EV_P_ W w)
1572 {
1573 ev_unref (EV_A);
1574 w->active = 0;
1575 }
1576
1577 /*****************************************************************************/
1578
1579 void
1580 ev_io_start (EV_P_ ev_io *w)
1581 {
1582 int fd = w->fd;
1583
1584 if (expect_false (ev_is_active (w)))
1585 return;
1586
1587 assert (("ev_io_start called with negative fd", fd >= 0));
1588
1589 ev_start (EV_A_ (W)w, 1);
1590 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1591 wlist_add ((WL *)&anfds[fd].head, (WL)w);
1592
1593 fd_change (EV_A_ fd);
1594 }
1595
1596 void
1597 ev_io_stop (EV_P_ ev_io *w)
1598 {
1599 clear_pending (EV_A_ (W)w);
1600 if (expect_false (!ev_is_active (w)))
1601 return;
1602
1603 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1604
1605 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
1606 ev_stop (EV_A_ (W)w);
1607
1608 fd_change (EV_A_ w->fd);
1609 }
1610
1611 void
1612 ev_timer_start (EV_P_ ev_timer *w)
1613 {
1614 if (expect_false (ev_is_active (w)))
1615 return;
1616
1617 ((WT)w)->at += mn_now;
1618
1619 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1620
1621 ev_start (EV_A_ (W)w, ++timercnt);
1622 array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
1623 timers [timercnt - 1] = w;
1624 upheap ((WT *)timers, timercnt - 1);
1625
1626 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1627 }
1628
1629 void
1630 ev_timer_stop (EV_P_ ev_timer *w)
1631 {
1632 clear_pending (EV_A_ (W)w);
1633 if (expect_false (!ev_is_active (w)))
1634 return;
1635
1636 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1637
1638 {
1639 int active = ((W)w)->active;
1640
1641 if (expect_true (--active < --timercnt))
1642 {
1643 timers [active] = timers [timercnt];
1644 adjustheap ((WT *)timers, timercnt, active);
1645 }
1646 }
1647
1648 ((WT)w)->at -= mn_now;
1649
1650 ev_stop (EV_A_ (W)w);
1651 }
1652
1653 void
1654 ev_timer_again (EV_P_ ev_timer *w)
1655 {
1656 if (ev_is_active (w))
1657 {
1658 if (w->repeat)
1659 {
1660 ((WT)w)->at = mn_now + w->repeat;
1661 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1662 }
1663 else
1664 ev_timer_stop (EV_A_ w);
1665 }
1666 else if (w->repeat)
1667 {
1668 w->at = w->repeat;
1669 ev_timer_start (EV_A_ w);
1670 }
1671 }
1672
1673 #if EV_PERIODIC_ENABLE
1674 void
1675 ev_periodic_start (EV_P_ ev_periodic *w)
1676 {
1677 if (expect_false (ev_is_active (w)))
1678 return;
1679
1680 if (w->reschedule_cb)
1681 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1682 else if (w->interval)
1683 {
1684 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1685 /* this formula differs from the one in periodic_reify because we do not always round up */
1686 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1687 }
1688
1689 ev_start (EV_A_ (W)w, ++periodiccnt);
1690 array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
1691 periodics [periodiccnt - 1] = w;
1692 upheap ((WT *)periodics, periodiccnt - 1);
1693
1694 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1695 }
1696
1697 void
1698 ev_periodic_stop (EV_P_ ev_periodic *w)
1699 {
1700 clear_pending (EV_A_ (W)w);
1701 if (expect_false (!ev_is_active (w)))
1702 return;
1703
1704 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1705
1706 {
1707 int active = ((W)w)->active;
1708
1709 if (expect_true (--active < --periodiccnt))
1710 {
1711 periodics [active] = periodics [periodiccnt];
1712 adjustheap ((WT *)periodics, periodiccnt, active);
1713 }
1714 }
1715
1716 ev_stop (EV_A_ (W)w);
1717 }
1718
1719 void
1720 ev_periodic_again (EV_P_ ev_periodic *w)
1721 {
1722 /* TODO: use adjustheap and recalculation */
1723 ev_periodic_stop (EV_A_ w);
1724 ev_periodic_start (EV_A_ w);
1725 }
1726 #endif
1727
1728 #ifndef SA_RESTART
1729 # define SA_RESTART 0
1730 #endif
1731
1732 void
1733 ev_signal_start (EV_P_ ev_signal *w)
1734 {
1735 #if EV_MULTIPLICITY
1736 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1737 #endif
1738 if (expect_false (ev_is_active (w)))
1739 return;
1740
1741 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1742
1743 ev_start (EV_A_ (W)w, 1);
1744 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1745 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
1746
1747 if (!((WL)w)->next)
1748 {
1749 #if _WIN32
1750 signal (w->signum, sighandler);
1751 #else
1752 struct sigaction sa;
1753 sa.sa_handler = sighandler;
1754 sigfillset (&sa.sa_mask);
1755 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1756 sigaction (w->signum, &sa, 0);
1757 #endif
1758 }
1759 }
1760
1761 void
1762 ev_signal_stop (EV_P_ ev_signal *w)
1763 {
1764 clear_pending (EV_A_ (W)w);
1765 if (expect_false (!ev_is_active (w)))
1766 return;
1767
1768 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1769 ev_stop (EV_A_ (W)w);
1770
1771 if (!signals [w->signum - 1].head)
1772 signal (w->signum, SIG_DFL);
1773 }
1774
1775 void
1776 ev_child_start (EV_P_ ev_child *w)
1777 {
1778 #if EV_MULTIPLICITY
1779 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1780 #endif
1781 if (expect_false (ev_is_active (w)))
1782 return;
1783
1784 ev_start (EV_A_ (W)w, 1);
1785 wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1786 }
1787
1788 void
1789 ev_child_stop (EV_P_ ev_child *w)
1790 {
1791 clear_pending (EV_A_ (W)w);
1792 if (expect_false (!ev_is_active (w)))
1793 return;
1794
1795 wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1796 ev_stop (EV_A_ (W)w);
1797 }
1798
1799 #if EV_STAT_ENABLE
1800
1801 # ifdef _WIN32
1802 # undef lstat
1803 # define lstat(a,b) _stati64 (a,b)
1804 # endif
1805
1806 #define DEF_STAT_INTERVAL 5.0074891
1807 #define MIN_STAT_INTERVAL 0.1074891
1808
1809 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
1810
1811 #if EV_USE_INOTIFY
1812 # define EV_INOTIFY_BUFSIZE 8192
1813
1814 static void noinline
1815 infy_add (EV_P_ ev_stat *w)
1816 {
1817 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);
1818
1819 if (w->wd < 0)
1820 {
1821 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
1822
1823 /* monitor some parent directory for speedup hints */
1824 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
1825 {
1826 char path [4096];
1827 strcpy (path, w->path);
1828
1829 do
1830 {
1831 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
1832 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
1833
1834 char *pend = strrchr (path, '/');
1835
1836 if (!pend)
1837 break; /* whoops, no '/', complain to your admin */
1838
1839 *pend = 0;
1840 w->wd = inotify_add_watch (fs_fd, path, mask);
1841 }
1842 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
1843 }
1844 }
1845 else
1846 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
1847
1848 if (w->wd >= 0)
1849 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
1850 }
1851
1852 static void noinline
1853 infy_del (EV_P_ ev_stat *w)
1854 {
1855 int slot;
1856 int wd = w->wd;
1857
1858 if (wd < 0)
1859 return;
1860
1861 w->wd = -2;
1862 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
1863 wlist_del (&fs_hash [slot].head, (WL)w);
1864
1865 /* remove this watcher, if others are watching it, they will rearm */
1866 inotify_rm_watch (fs_fd, wd);
1867 }
1868
1869 static void noinline
1870 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
1871 {
1872 if (slot < 0)
1873 /* overflow, need to check for all hahs slots */
1874 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1875 infy_wd (EV_A_ slot, wd, ev);
1876 else
1877 {
1878 WL w_;
1879
1880 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
1881 {
1882 ev_stat *w = (ev_stat *)w_;
1883 w_ = w_->next; /* lets us remove this watcher and all before it */
1884
1885 if (w->wd == wd || wd == -1)
1886 {
1887 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
1888 {
1889 w->wd = -1;
1890 infy_add (EV_A_ w); /* re-add, no matter what */
1891 }
1892
1893 stat_timer_cb (EV_A_ &w->timer, 0);
1894 }
1895 }
1896 }
1897 }
1898
1899 static void
1900 infy_cb (EV_P_ ev_io *w, int revents)
1901 {
1902 char buf [EV_INOTIFY_BUFSIZE];
1903 struct inotify_event *ev = (struct inotify_event *)buf;
1904 int ofs;
1905 int len = read (fs_fd, buf, sizeof (buf));
1906
1907 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
1908 infy_wd (EV_A_ ev->wd, ev->wd, ev);
1909 }
1910
1911 void inline_size
1912 infy_init (EV_P)
1913 {
1914 if (fs_fd != -2)
1915 return;
1916
1917 fs_fd = inotify_init ();
1918
1919 if (fs_fd >= 0)
1920 {
1921 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
1922 ev_set_priority (&fs_w, EV_MAXPRI);
1923 ev_io_start (EV_A_ &fs_w);
1924 }
1925 }
1926
1927 void inline_size
1928 infy_fork (EV_P)
1929 {
1930 int slot;
1931
1932 if (fs_fd < 0)
1933 return;
1934
1935 close (fs_fd);
1936 fs_fd = inotify_init ();
1937
1938 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1939 {
1940 WL w_ = fs_hash [slot].head;
1941 fs_hash [slot].head = 0;
1942
1943 while (w_)
1944 {
1945 ev_stat *w = (ev_stat *)w_;
1946 w_ = w_->next; /* lets us add this watcher */
1947
1948 w->wd = -1;
1949
1950 if (fs_fd >= 0)
1951 infy_add (EV_A_ w); /* re-add, no matter what */
1952 else
1953 ev_timer_start (EV_A_ &w->timer);
1954 }
1955
1956 }
1957 }
1958
1959 #endif
1960
1961 void
1962 ev_stat_stat (EV_P_ ev_stat *w)
1963 {
1964 if (lstat (w->path, &w->attr) < 0)
1965 w->attr.st_nlink = 0;
1966 else if (!w->attr.st_nlink)
1967 w->attr.st_nlink = 1;
1968 }
1969
1970 static void noinline
1971 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
1972 {
1973 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
1974
1975 /* we copy this here each the time so that */
1976 /* prev has the old value when the callback gets invoked */
1977 w->prev = w->attr;
1978 ev_stat_stat (EV_A_ w);
1979
1980 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
1981 if (
1982 w->prev.st_dev != w->attr.st_dev
1983 || w->prev.st_ino != w->attr.st_ino
1984 || w->prev.st_mode != w->attr.st_mode
1985 || w->prev.st_nlink != w->attr.st_nlink
1986 || w->prev.st_uid != w->attr.st_uid
1987 || w->prev.st_gid != w->attr.st_gid
1988 || w->prev.st_rdev != w->attr.st_rdev
1989 || w->prev.st_size != w->attr.st_size
1990 || w->prev.st_atime != w->attr.st_atime
1991 || w->prev.st_mtime != w->attr.st_mtime
1992 || w->prev.st_ctime != w->attr.st_ctime
1993 ) {
1994 #if EV_USE_INOTIFY
1995 infy_del (EV_A_ w);
1996 infy_add (EV_A_ w);
1997 ev_stat_stat (EV_A_ w); /* avoid race... */
1998 #endif
1999
2000 ev_feed_event (EV_A_ w, EV_STAT);
2001 }
2002 }
2003
2004 void
2005 ev_stat_start (EV_P_ ev_stat *w)
2006 {
2007 if (expect_false (ev_is_active (w)))
2008 return;
2009
2010 /* since we use memcmp, we need to clear any padding data etc. */
2011 memset (&w->prev, 0, sizeof (ev_statdata));
2012 memset (&w->attr, 0, sizeof (ev_statdata));
2013
2014 ev_stat_stat (EV_A_ w);
2015
2016 if (w->interval < MIN_STAT_INTERVAL)
2017 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2018
2019 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2020 ev_set_priority (&w->timer, ev_priority (w));
2021
2022 #if EV_USE_INOTIFY
2023 infy_init (EV_A);
2024
2025 if (fs_fd >= 0)
2026 infy_add (EV_A_ w);
2027 else
2028 #endif
2029 ev_timer_start (EV_A_ &w->timer);
2030
2031 ev_start (EV_A_ (W)w, 1);
2032 }
2033
2034 void
2035 ev_stat_stop (EV_P_ ev_stat *w)
2036 {
2037 clear_pending (EV_A_ (W)w);
2038 if (expect_false (!ev_is_active (w)))
2039 return;
2040
2041 #if EV_USE_INOTIFY
2042 infy_del (EV_A_ w);
2043 #endif
2044 ev_timer_stop (EV_A_ &w->timer);
2045
2046 ev_stop (EV_A_ (W)w);
2047 }
2048 #endif
2049
2050 #if EV_IDLE_ENABLE
2051 void
2052 ev_idle_start (EV_P_ ev_idle *w)
2053 {
2054 if (expect_false (ev_is_active (w)))
2055 return;
2056
2057 pri_adjust (EV_A_ (W)w);
2058
2059 {
2060 int active = ++idlecnt [ABSPRI (w)];
2061
2062 ++idleall;
2063 ev_start (EV_A_ (W)w, active);
2064
2065 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2066 idles [ABSPRI (w)][active - 1] = w;
2067 }
2068 }
2069
2070 void
2071 ev_idle_stop (EV_P_ ev_idle *w)
2072 {
2073 clear_pending (EV_A_ (W)w);
2074 if (expect_false (!ev_is_active (w)))
2075 return;
2076
2077 {
2078 int active = ((W)w)->active;
2079
2080 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2081 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2082
2083 ev_stop (EV_A_ (W)w);
2084 --idleall;
2085 }
2086 }
2087 #endif
2088
2089 void
2090 ev_prepare_start (EV_P_ ev_prepare *w)
2091 {
2092 if (expect_false (ev_is_active (w)))
2093 return;
2094
2095 ev_start (EV_A_ (W)w, ++preparecnt);
2096 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2097 prepares [preparecnt - 1] = w;
2098 }
2099
2100 void
2101 ev_prepare_stop (EV_P_ ev_prepare *w)
2102 {
2103 clear_pending (EV_A_ (W)w);
2104 if (expect_false (!ev_is_active (w)))
2105 return;
2106
2107 {
2108 int active = ((W)w)->active;
2109 prepares [active - 1] = prepares [--preparecnt];
2110 ((W)prepares [active - 1])->active = active;
2111 }
2112
2113 ev_stop (EV_A_ (W)w);
2114 }
2115
2116 void
2117 ev_check_start (EV_P_ ev_check *w)
2118 {
2119 if (expect_false (ev_is_active (w)))
2120 return;
2121
2122 ev_start (EV_A_ (W)w, ++checkcnt);
2123 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2124 checks [checkcnt - 1] = w;
2125 }
2126
2127 void
2128 ev_check_stop (EV_P_ ev_check *w)
2129 {
2130 clear_pending (EV_A_ (W)w);
2131 if (expect_false (!ev_is_active (w)))
2132 return;
2133
2134 {
2135 int active = ((W)w)->active;
2136 checks [active - 1] = checks [--checkcnt];
2137 ((W)checks [active - 1])->active = active;
2138 }
2139
2140 ev_stop (EV_A_ (W)w);
2141 }
2142
2143 #if EV_EMBED_ENABLE
2144 void noinline
2145 ev_embed_sweep (EV_P_ ev_embed *w)
2146 {
2147 ev_loop (w->loop, EVLOOP_NONBLOCK);
2148 }
2149
2150 static void
2151 embed_cb (EV_P_ ev_io *io, int revents)
2152 {
2153 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2154
2155 if (ev_cb (w))
2156 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2157 else
2158 ev_embed_sweep (loop, w);
2159 }
2160
2161 void
2162 ev_embed_start (EV_P_ ev_embed *w)
2163 {
2164 if (expect_false (ev_is_active (w)))
2165 return;
2166
2167 {
2168 struct ev_loop *loop = w->loop;
2169 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2170 ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
2171 }
2172
2173 ev_set_priority (&w->io, ev_priority (w));
2174 ev_io_start (EV_A_ &w->io);
2175
2176 ev_start (EV_A_ (W)w, 1);
2177 }
2178
2179 void
2180 ev_embed_stop (EV_P_ ev_embed *w)
2181 {
2182 clear_pending (EV_A_ (W)w);
2183 if (expect_false (!ev_is_active (w)))
2184 return;
2185
2186 ev_io_stop (EV_A_ &w->io);
2187
2188 ev_stop (EV_A_ (W)w);
2189 }
2190 #endif
2191
2192 #if EV_FORK_ENABLE
2193 void
2194 ev_fork_start (EV_P_ ev_fork *w)
2195 {
2196 if (expect_false (ev_is_active (w)))
2197 return;
2198
2199 ev_start (EV_A_ (W)w, ++forkcnt);
2200 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2201 forks [forkcnt - 1] = w;
2202 }
2203
2204 void
2205 ev_fork_stop (EV_P_ ev_fork *w)
2206 {
2207 clear_pending (EV_A_ (W)w);
2208 if (expect_false (!ev_is_active (w)))
2209 return;
2210
2211 {
2212 int active = ((W)w)->active;
2213 forks [active - 1] = forks [--forkcnt];
2214 ((W)forks [active - 1])->active = active;
2215 }
2216
2217 ev_stop (EV_A_ (W)w);
2218 }
2219 #endif
2220
2221 /*****************************************************************************/
2222
2223 struct ev_once
2224 {
2225 ev_io io;
2226 ev_timer to;
2227 void (*cb)(int revents, void *arg);
2228 void *arg;
2229 };
2230
2231 static void
2232 once_cb (EV_P_ struct ev_once *once, int revents)
2233 {
2234 void (*cb)(int revents, void *arg) = once->cb;
2235 void *arg = once->arg;
2236
2237 ev_io_stop (EV_A_ &once->io);
2238 ev_timer_stop (EV_A_ &once->to);
2239 ev_free (once);
2240
2241 cb (revents, arg);
2242 }
2243
2244 static void
2245 once_cb_io (EV_P_ ev_io *w, int revents)
2246 {
2247 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2248 }
2249
2250 static void
2251 once_cb_to (EV_P_ ev_timer *w, int revents)
2252 {
2253 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2254 }
2255
2256 void
2257 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2258 {
2259 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2260
2261 if (expect_false (!once))
2262 {
2263 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2264 return;
2265 }
2266
2267 once->cb = cb;
2268 once->arg = arg;
2269
2270 ev_init (&once->io, once_cb_io);
2271 if (fd >= 0)
2272 {
2273 ev_io_set (&once->io, fd, events);
2274 ev_io_start (EV_A_ &once->io);
2275 }
2276
2277 ev_init (&once->to, once_cb_to);
2278 if (timeout >= 0.)
2279 {
2280 ev_timer_set (&once->to, timeout, 0.);
2281 ev_timer_start (EV_A_ &once->to);
2282 }
2283 }
2284
2285 #ifdef __cplusplus
2286 }
2287 #endif
2288