ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev.c
Revision: 1.149
Committed: Tue Nov 27 19:23:31 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.148: +14 -6 lines
Log Message:
*** empty log message ***

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 #endif
100
101 #include <math.h>
102 #include <stdlib.h>
103 #include <fcntl.h>
104 #include <stddef.h>
105
106 #include <stdio.h>
107
108 #include <assert.h>
109 #include <errno.h>
110 #include <sys/types.h>
111 #include <time.h>
112
113 #include <signal.h>
114
115 #ifndef _WIN32
116 # include <sys/time.h>
117 # include <sys/wait.h>
118 # include <unistd.h>
119 #else
120 # define WIN32_LEAN_AND_MEAN
121 # include <windows.h>
122 # ifndef EV_SELECT_IS_WINSOCKET
123 # define EV_SELECT_IS_WINSOCKET 1
124 # endif
125 #endif
126
127 /**/
128
129 #ifndef EV_USE_MONOTONIC
130 # define EV_USE_MONOTONIC 0
131 #endif
132
133 #ifndef EV_USE_REALTIME
134 # define EV_USE_REALTIME 0
135 #endif
136
137 #ifndef EV_USE_SELECT
138 # define EV_USE_SELECT 1
139 #endif
140
141 #ifndef EV_USE_POLL
142 # ifdef _WIN32
143 # define EV_USE_POLL 0
144 # else
145 # define EV_USE_POLL 1
146 # endif
147 #endif
148
149 #ifndef EV_USE_EPOLL
150 # define EV_USE_EPOLL 0
151 #endif
152
153 #ifndef EV_USE_KQUEUE
154 # define EV_USE_KQUEUE 0
155 #endif
156
157 #ifndef EV_USE_PORT
158 # define EV_USE_PORT 0
159 #endif
160
161 #ifndef EV_PID_HASHSIZE
162 # if EV_MINIMAL
163 # define EV_PID_HASHSIZE 1
164 # else
165 # define EV_PID_HASHSIZE 16
166 # endif
167 #endif
168
169 /**/
170
171 #ifndef CLOCK_MONOTONIC
172 # undef EV_USE_MONOTONIC
173 # define EV_USE_MONOTONIC 0
174 #endif
175
176 #ifndef CLOCK_REALTIME
177 # undef EV_USE_REALTIME
178 # define EV_USE_REALTIME 0
179 #endif
180
181 #if EV_SELECT_IS_WINSOCKET
182 # include <winsock.h>
183 #endif
184
185 /**/
186
187 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
188 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
189 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
190
191 #ifdef EV_H
192 # include EV_H
193 #else
194 # include "ev.h"
195 #endif
196
197 #if __GNUC__ >= 3
198 # define expect(expr,value) __builtin_expect ((expr),(value))
199 # define inline_size static inline /* inline for codesize */
200 # if EV_MINIMAL
201 # define noinline __attribute__ ((noinline))
202 # define inline_speed static noinline
203 # else
204 # define noinline
205 # define inline_speed static inline
206 # endif
207 #else
208 # define expect(expr,value) (expr)
209 # define inline_speed static
210 # define inline_size static
211 # define noinline
212 #endif
213
214 #define expect_false(expr) expect ((expr) != 0, 0)
215 #define expect_true(expr) expect ((expr) != 0, 1)
216
217 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
218 #define ABSPRI(w) ((w)->priority - EV_MINPRI)
219
220 #define EMPTY0 /* required for microsofts broken pseudo-c compiler */
221 #define EMPTY2(a,b) /* used to suppress some warnings */
222
223 typedef ev_watcher *W;
224 typedef ev_watcher_list *WL;
225 typedef ev_watcher_time *WT;
226
227 static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
228
229 #ifdef _WIN32
230 # include "ev_win32.c"
231 #endif
232
233 /*****************************************************************************/
234
235 static void (*syserr_cb)(const char *msg);
236
237 void
238 ev_set_syserr_cb (void (*cb)(const char *msg))
239 {
240 syserr_cb = cb;
241 }
242
243 static void noinline
244 syserr (const char *msg)
245 {
246 if (!msg)
247 msg = "(libev) system error";
248
249 if (syserr_cb)
250 syserr_cb (msg);
251 else
252 {
253 perror (msg);
254 abort ();
255 }
256 }
257
258 static void *(*alloc)(void *ptr, long size);
259
260 void
261 ev_set_allocator (void *(*cb)(void *ptr, long size))
262 {
263 alloc = cb;
264 }
265
266 static void *
267 ev_realloc (void *ptr, long size)
268 {
269 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
270
271 if (!ptr && size)
272 {
273 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
274 abort ();
275 }
276
277 return ptr;
278 }
279
280 #define ev_malloc(size) ev_realloc (0, (size))
281 #define ev_free(ptr) ev_realloc ((ptr), 0)
282
283 /*****************************************************************************/
284
285 typedef struct
286 {
287 WL head;
288 unsigned char events;
289 unsigned char reify;
290 #if EV_SELECT_IS_WINSOCKET
291 SOCKET handle;
292 #endif
293 } ANFD;
294
295 typedef struct
296 {
297 W w;
298 int events;
299 } ANPENDING;
300
301 #if EV_MULTIPLICITY
302
303 struct ev_loop
304 {
305 ev_tstamp ev_rt_now;
306 #define ev_rt_now ((loop)->ev_rt_now)
307 #define VAR(name,decl) decl;
308 #include "ev_vars.h"
309 #undef VAR
310 };
311 #include "ev_wrap.h"
312
313 static struct ev_loop default_loop_struct;
314 struct ev_loop *ev_default_loop_ptr;
315
316 #else
317
318 ev_tstamp ev_rt_now;
319 #define VAR(name,decl) static decl;
320 #include "ev_vars.h"
321 #undef VAR
322
323 static int ev_default_loop_ptr;
324
325 #endif
326
327 /*****************************************************************************/
328
329 ev_tstamp
330 ev_time (void)
331 {
332 #if EV_USE_REALTIME
333 struct timespec ts;
334 clock_gettime (CLOCK_REALTIME, &ts);
335 return ts.tv_sec + ts.tv_nsec * 1e-9;
336 #else
337 struct timeval tv;
338 gettimeofday (&tv, 0);
339 return tv.tv_sec + tv.tv_usec * 1e-6;
340 #endif
341 }
342
343 ev_tstamp inline_size
344 get_clock (void)
345 {
346 #if EV_USE_MONOTONIC
347 if (expect_true (have_monotonic))
348 {
349 struct timespec ts;
350 clock_gettime (CLOCK_MONOTONIC, &ts);
351 return ts.tv_sec + ts.tv_nsec * 1e-9;
352 }
353 #endif
354
355 return ev_time ();
356 }
357
358 #if EV_MULTIPLICITY
359 ev_tstamp
360 ev_now (EV_P)
361 {
362 return ev_rt_now;
363 }
364 #endif
365
366 #define array_roundsize(type,n) (((n) | 4) & ~3)
367
368 #define array_needsize(type,base,cur,cnt,init) \
369 if (expect_false ((cnt) > cur)) \
370 { \
371 int newcnt = cur; \
372 do \
373 { \
374 newcnt = array_roundsize (type, newcnt << 1); \
375 } \
376 while ((cnt) > newcnt); \
377 \
378 base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
379 init (base + cur, newcnt - cur); \
380 cur = newcnt; \
381 }
382
383 #define array_slim(type,stem) \
384 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
385 { \
386 stem ## max = array_roundsize (stem ## cnt >> 1); \
387 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
388 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
389 }
390
391 #define array_free(stem, idx) \
392 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
393
394 /*****************************************************************************/
395
396 void noinline
397 ev_feed_event (EV_P_ void *w, int revents)
398 {
399 W w_ = (W)w;
400
401 if (expect_false (w_->pending))
402 {
403 pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
404 return;
405 }
406
407 w_->pending = ++pendingcnt [ABSPRI (w_)];
408 array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
409 pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
410 pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
411 }
412
413 void inline_size
414 queue_events (EV_P_ W *events, int eventcnt, int type)
415 {
416 int i;
417
418 for (i = 0; i < eventcnt; ++i)
419 ev_feed_event (EV_A_ events [i], type);
420 }
421
422 /*****************************************************************************/
423
424 void inline_size
425 anfds_init (ANFD *base, int count)
426 {
427 while (count--)
428 {
429 base->head = 0;
430 base->events = EV_NONE;
431 base->reify = 0;
432
433 ++base;
434 }
435 }
436
437 void inline_speed
438 fd_event (EV_P_ int fd, int revents)
439 {
440 ANFD *anfd = anfds + fd;
441 ev_io *w;
442
443 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
444 {
445 int ev = w->events & revents;
446
447 if (ev)
448 ev_feed_event (EV_A_ (W)w, ev);
449 }
450 }
451
452 void
453 ev_feed_fd_event (EV_P_ int fd, int revents)
454 {
455 fd_event (EV_A_ fd, revents);
456 }
457
458 void inline_size
459 fd_reify (EV_P)
460 {
461 int i;
462
463 for (i = 0; i < fdchangecnt; ++i)
464 {
465 int fd = fdchanges [i];
466 ANFD *anfd = anfds + fd;
467 ev_io *w;
468
469 int events = 0;
470
471 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
472 events |= w->events;
473
474 #if EV_SELECT_IS_WINSOCKET
475 if (events)
476 {
477 unsigned long argp;
478 anfd->handle = _get_osfhandle (fd);
479 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
480 }
481 #endif
482
483 anfd->reify = 0;
484
485 backend_modify (EV_A_ fd, anfd->events, events);
486 anfd->events = events;
487 }
488
489 fdchangecnt = 0;
490 }
491
492 void inline_size
493 fd_change (EV_P_ int fd)
494 {
495 if (expect_false (anfds [fd].reify))
496 return;
497
498 anfds [fd].reify = 1;
499
500 ++fdchangecnt;
501 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
502 fdchanges [fdchangecnt - 1] = fd;
503 }
504
505 void inline_speed
506 fd_kill (EV_P_ int fd)
507 {
508 ev_io *w;
509
510 while ((w = (ev_io *)anfds [fd].head))
511 {
512 ev_io_stop (EV_A_ w);
513 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
514 }
515 }
516
517 int inline_size
518 fd_valid (int fd)
519 {
520 #ifdef _WIN32
521 return _get_osfhandle (fd) != -1;
522 #else
523 return fcntl (fd, F_GETFD) != -1;
524 #endif
525 }
526
527 /* called on EBADF to verify fds */
528 static void noinline
529 fd_ebadf (EV_P)
530 {
531 int fd;
532
533 for (fd = 0; fd < anfdmax; ++fd)
534 if (anfds [fd].events)
535 if (!fd_valid (fd) == -1 && errno == EBADF)
536 fd_kill (EV_A_ fd);
537 }
538
539 /* called on ENOMEM in select/poll to kill some fds and retry */
540 static void noinline
541 fd_enomem (EV_P)
542 {
543 int fd;
544
545 for (fd = anfdmax; fd--; )
546 if (anfds [fd].events)
547 {
548 fd_kill (EV_A_ fd);
549 return;
550 }
551 }
552
553 /* usually called after fork if backend needs to re-arm all fds from scratch */
554 static void noinline
555 fd_rearm_all (EV_P)
556 {
557 int fd;
558
559 /* this should be highly optimised to not do anything but set a flag */
560 for (fd = 0; fd < anfdmax; ++fd)
561 if (anfds [fd].events)
562 {
563 anfds [fd].events = 0;
564 fd_change (EV_A_ fd);
565 }
566 }
567
568 /*****************************************************************************/
569
570 void inline_speed
571 upheap (WT *heap, int k)
572 {
573 WT w = heap [k];
574
575 while (k && heap [k >> 1]->at > w->at)
576 {
577 heap [k] = heap [k >> 1];
578 ((W)heap [k])->active = k + 1;
579 k >>= 1;
580 }
581
582 heap [k] = w;
583 ((W)heap [k])->active = k + 1;
584
585 }
586
587 void inline_speed
588 downheap (WT *heap, int N, int k)
589 {
590 WT w = heap [k];
591
592 while (k < (N >> 1))
593 {
594 int j = k << 1;
595
596 if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
597 ++j;
598
599 if (w->at <= heap [j]->at)
600 break;
601
602 heap [k] = heap [j];
603 ((W)heap [k])->active = k + 1;
604 k = j;
605 }
606
607 heap [k] = w;
608 ((W)heap [k])->active = k + 1;
609 }
610
611 void inline_size
612 adjustheap (WT *heap, int N, int k)
613 {
614 upheap (heap, k);
615 downheap (heap, N, k);
616 }
617
618 /*****************************************************************************/
619
620 typedef struct
621 {
622 WL head;
623 sig_atomic_t volatile gotsig;
624 } ANSIG;
625
626 static ANSIG *signals;
627 static int signalmax;
628
629 static int sigpipe [2];
630 static sig_atomic_t volatile gotsig;
631 static ev_io sigev;
632
633 void inline_size
634 signals_init (ANSIG *base, int count)
635 {
636 while (count--)
637 {
638 base->head = 0;
639 base->gotsig = 0;
640
641 ++base;
642 }
643 }
644
645 static void
646 sighandler (int signum)
647 {
648 #if _WIN32
649 signal (signum, sighandler);
650 #endif
651
652 signals [signum - 1].gotsig = 1;
653
654 if (!gotsig)
655 {
656 int old_errno = errno;
657 gotsig = 1;
658 write (sigpipe [1], &signum, 1);
659 errno = old_errno;
660 }
661 }
662
663 void noinline
664 ev_feed_signal_event (EV_P_ int signum)
665 {
666 WL w;
667
668 #if EV_MULTIPLICITY
669 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
670 #endif
671
672 --signum;
673
674 if (signum < 0 || signum >= signalmax)
675 return;
676
677 signals [signum].gotsig = 0;
678
679 for (w = signals [signum].head; w; w = w->next)
680 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
681 }
682
683 static void
684 sigcb (EV_P_ ev_io *iow, int revents)
685 {
686 int signum;
687
688 read (sigpipe [0], &revents, 1);
689 gotsig = 0;
690
691 for (signum = signalmax; signum--; )
692 if (signals [signum].gotsig)
693 ev_feed_signal_event (EV_A_ signum + 1);
694 }
695
696 void inline_size
697 fd_intern (int fd)
698 {
699 #ifdef _WIN32
700 int arg = 1;
701 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
702 #else
703 fcntl (fd, F_SETFD, FD_CLOEXEC);
704 fcntl (fd, F_SETFL, O_NONBLOCK);
705 #endif
706 }
707
708 static void noinline
709 siginit (EV_P)
710 {
711 fd_intern (sigpipe [0]);
712 fd_intern (sigpipe [1]);
713
714 ev_io_set (&sigev, sigpipe [0], EV_READ);
715 ev_io_start (EV_A_ &sigev);
716 ev_unref (EV_A); /* child watcher should not keep loop alive */
717 }
718
719 /*****************************************************************************/
720
721 static ev_child *childs [EV_PID_HASHSIZE];
722
723 #ifndef _WIN32
724
725 static ev_signal childev;
726
727 void inline_speed
728 child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
729 {
730 ev_child *w;
731
732 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
733 if (w->pid == pid || !w->pid)
734 {
735 ev_priority (w) = ev_priority (sw); /* need to do it *now* */
736 w->rpid = pid;
737 w->rstatus = status;
738 ev_feed_event (EV_A_ (W)w, EV_CHILD);
739 }
740 }
741
742 #ifndef WCONTINUED
743 # define WCONTINUED 0
744 #endif
745
746 static void
747 childcb (EV_P_ ev_signal *sw, int revents)
748 {
749 int pid, status;
750
751 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
752 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
753 if (!WCONTINUED
754 || errno != EINVAL
755 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
756 return;
757
758 /* make sure we are called again until all childs have been reaped */
759 /* we need to do it this way so that the callback gets called before we continue */
760 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
761
762 child_reap (EV_A_ sw, pid, pid, status);
763 if (EV_PID_HASHSIZE > 1)
764 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
765 }
766
767 #endif
768
769 /*****************************************************************************/
770
771 #if EV_USE_PORT
772 # include "ev_port.c"
773 #endif
774 #if EV_USE_KQUEUE
775 # include "ev_kqueue.c"
776 #endif
777 #if EV_USE_EPOLL
778 # include "ev_epoll.c"
779 #endif
780 #if EV_USE_POLL
781 # include "ev_poll.c"
782 #endif
783 #if EV_USE_SELECT
784 # include "ev_select.c"
785 #endif
786
787 int
788 ev_version_major (void)
789 {
790 return EV_VERSION_MAJOR;
791 }
792
793 int
794 ev_version_minor (void)
795 {
796 return EV_VERSION_MINOR;
797 }
798
799 /* return true if we are running with elevated privileges and should ignore env variables */
800 int inline_size
801 enable_secure (void)
802 {
803 #ifdef _WIN32
804 return 0;
805 #else
806 return getuid () != geteuid ()
807 || getgid () != getegid ();
808 #endif
809 }
810
811 unsigned int
812 ev_supported_backends (void)
813 {
814 unsigned int flags = 0;
815
816 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
817 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
818 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
819 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
820 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
821
822 return flags;
823 }
824
825 unsigned int
826 ev_recommended_backends (void)
827 {
828 unsigned int flags = ev_supported_backends ();
829
830 #ifndef __NetBSD__
831 /* kqueue is borked on everything but netbsd apparently */
832 /* it usually doesn't work correctly on anything but sockets and pipes */
833 flags &= ~EVBACKEND_KQUEUE;
834 #endif
835 #ifdef __APPLE__
836 // flags &= ~EVBACKEND_KQUEUE; for documentation
837 flags &= ~EVBACKEND_POLL;
838 #endif
839
840 return flags;
841 }
842
843 unsigned int
844 ev_embeddable_backends (void)
845 {
846 return EVBACKEND_EPOLL
847 | EVBACKEND_KQUEUE
848 | EVBACKEND_PORT;
849 }
850
851 unsigned int
852 ev_backend (EV_P)
853 {
854 return backend;
855 }
856
857 static void
858 loop_init (EV_P_ unsigned int flags)
859 {
860 if (!backend)
861 {
862 #if EV_USE_MONOTONIC
863 {
864 struct timespec ts;
865 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
866 have_monotonic = 1;
867 }
868 #endif
869
870 ev_rt_now = ev_time ();
871 mn_now = get_clock ();
872 now_floor = mn_now;
873 rtmn_diff = ev_rt_now - mn_now;
874
875 if (!(flags & EVFLAG_NOENV)
876 && !enable_secure ()
877 && getenv ("LIBEV_FLAGS"))
878 flags = atoi (getenv ("LIBEV_FLAGS"));
879
880 if (!(flags & 0x0000ffffUL))
881 flags |= ev_recommended_backends ();
882
883 backend = 0;
884 #if EV_USE_PORT
885 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
886 #endif
887 #if EV_USE_KQUEUE
888 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
889 #endif
890 #if EV_USE_EPOLL
891 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
892 #endif
893 #if EV_USE_POLL
894 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
895 #endif
896 #if EV_USE_SELECT
897 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
898 #endif
899
900 ev_init (&sigev, sigcb);
901 ev_set_priority (&sigev, EV_MAXPRI);
902 }
903 }
904
905 static void
906 loop_destroy (EV_P)
907 {
908 int i;
909
910 #if EV_USE_PORT
911 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
912 #endif
913 #if EV_USE_KQUEUE
914 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
915 #endif
916 #if EV_USE_EPOLL
917 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
918 #endif
919 #if EV_USE_POLL
920 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
921 #endif
922 #if EV_USE_SELECT
923 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
924 #endif
925
926 for (i = NUMPRI; i--; )
927 array_free (pending, [i]);
928
929 /* have to use the microsoft-never-gets-it-right macro */
930 array_free (fdchange, EMPTY0);
931 array_free (timer, EMPTY0);
932 #if EV_PERIODIC_ENABLE
933 array_free (periodic, EMPTY0);
934 #endif
935 array_free (idle, EMPTY0);
936 array_free (prepare, EMPTY0);
937 array_free (check, EMPTY0);
938
939 backend = 0;
940 }
941
942 static void
943 loop_fork (EV_P)
944 {
945 #if EV_USE_PORT
946 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
947 #endif
948 #if EV_USE_KQUEUE
949 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
950 #endif
951 #if EV_USE_EPOLL
952 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
953 #endif
954
955 if (ev_is_active (&sigev))
956 {
957 /* default loop */
958
959 ev_ref (EV_A);
960 ev_io_stop (EV_A_ &sigev);
961 close (sigpipe [0]);
962 close (sigpipe [1]);
963
964 while (pipe (sigpipe))
965 syserr ("(libev) error creating pipe");
966
967 siginit (EV_A);
968 }
969
970 postfork = 0;
971 }
972
973 #if EV_MULTIPLICITY
974 struct ev_loop *
975 ev_loop_new (unsigned int flags)
976 {
977 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
978
979 memset (loop, 0, sizeof (struct ev_loop));
980
981 loop_init (EV_A_ flags);
982
983 if (ev_backend (EV_A))
984 return loop;
985
986 return 0;
987 }
988
989 void
990 ev_loop_destroy (EV_P)
991 {
992 loop_destroy (EV_A);
993 ev_free (loop);
994 }
995
996 void
997 ev_loop_fork (EV_P)
998 {
999 postfork = 1;
1000 }
1001
1002 #endif
1003
1004 #if EV_MULTIPLICITY
1005 struct ev_loop *
1006 ev_default_loop_init (unsigned int flags)
1007 #else
1008 int
1009 ev_default_loop (unsigned int flags)
1010 #endif
1011 {
1012 if (sigpipe [0] == sigpipe [1])
1013 if (pipe (sigpipe))
1014 return 0;
1015
1016 if (!ev_default_loop_ptr)
1017 {
1018 #if EV_MULTIPLICITY
1019 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1020 #else
1021 ev_default_loop_ptr = 1;
1022 #endif
1023
1024 loop_init (EV_A_ flags);
1025
1026 if (ev_backend (EV_A))
1027 {
1028 siginit (EV_A);
1029
1030 #ifndef _WIN32
1031 ev_signal_init (&childev, childcb, SIGCHLD);
1032 ev_set_priority (&childev, EV_MAXPRI);
1033 ev_signal_start (EV_A_ &childev);
1034 ev_unref (EV_A); /* child watcher should not keep loop alive */
1035 #endif
1036 }
1037 else
1038 ev_default_loop_ptr = 0;
1039 }
1040
1041 return ev_default_loop_ptr;
1042 }
1043
1044 void
1045 ev_default_destroy (void)
1046 {
1047 #if EV_MULTIPLICITY
1048 struct ev_loop *loop = ev_default_loop_ptr;
1049 #endif
1050
1051 #ifndef _WIN32
1052 ev_ref (EV_A); /* child watcher */
1053 ev_signal_stop (EV_A_ &childev);
1054 #endif
1055
1056 ev_ref (EV_A); /* signal watcher */
1057 ev_io_stop (EV_A_ &sigev);
1058
1059 close (sigpipe [0]); sigpipe [0] = 0;
1060 close (sigpipe [1]); sigpipe [1] = 0;
1061
1062 loop_destroy (EV_A);
1063 }
1064
1065 void
1066 ev_default_fork (void)
1067 {
1068 #if EV_MULTIPLICITY
1069 struct ev_loop *loop = ev_default_loop_ptr;
1070 #endif
1071
1072 if (backend)
1073 postfork = 1;
1074 }
1075
1076 /*****************************************************************************/
1077
1078 int inline_size
1079 any_pending (EV_P)
1080 {
1081 int pri;
1082
1083 for (pri = NUMPRI; pri--; )
1084 if (pendingcnt [pri])
1085 return 1;
1086
1087 return 0;
1088 }
1089
1090 void inline_speed
1091 call_pending (EV_P)
1092 {
1093 int pri;
1094
1095 for (pri = NUMPRI; pri--; )
1096 while (pendingcnt [pri])
1097 {
1098 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1099
1100 if (expect_true (p->w))
1101 {
1102 assert (("non-pending watcher on pending list", p->w->pending));
1103
1104 p->w->pending = 0;
1105 EV_CB_INVOKE (p->w, p->events);
1106 }
1107 }
1108 }
1109
1110 void inline_size
1111 timers_reify (EV_P)
1112 {
1113 while (timercnt && ((WT)timers [0])->at <= mn_now)
1114 {
1115 ev_timer *w = timers [0];
1116
1117 assert (("inactive timer on timer heap detected", ev_is_active (w)));
1118
1119 /* first reschedule or stop timer */
1120 if (w->repeat)
1121 {
1122 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1123
1124 ((WT)w)->at += w->repeat;
1125 if (((WT)w)->at < mn_now)
1126 ((WT)w)->at = mn_now;
1127
1128 downheap ((WT *)timers, timercnt, 0);
1129 }
1130 else
1131 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1132
1133 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1134 }
1135 }
1136
1137 #if EV_PERIODIC_ENABLE
1138 void inline_size
1139 periodics_reify (EV_P)
1140 {
1141 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1142 {
1143 ev_periodic *w = periodics [0];
1144
1145 assert (("inactive timer on periodic heap detected", ev_is_active (w)));
1146
1147 /* first reschedule or stop timer */
1148 if (w->reschedule_cb)
1149 {
1150 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
1151 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1152 downheap ((WT *)periodics, periodiccnt, 0);
1153 }
1154 else if (w->interval)
1155 {
1156 ((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
1157 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1158 downheap ((WT *)periodics, periodiccnt, 0);
1159 }
1160 else
1161 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1162
1163 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1164 }
1165 }
1166
1167 static void noinline
1168 periodics_reschedule (EV_P)
1169 {
1170 int i;
1171
1172 /* adjust periodics after time jump */
1173 for (i = 0; i < periodiccnt; ++i)
1174 {
1175 ev_periodic *w = periodics [i];
1176
1177 if (w->reschedule_cb)
1178 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1179 else if (w->interval)
1180 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1181 }
1182
1183 /* now rebuild the heap */
1184 for (i = periodiccnt >> 1; i--; )
1185 downheap ((WT *)periodics, periodiccnt, i);
1186 }
1187 #endif
1188
1189 int inline_size
1190 time_update_monotonic (EV_P)
1191 {
1192 mn_now = get_clock ();
1193
1194 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1195 {
1196 ev_rt_now = rtmn_diff + mn_now;
1197 return 0;
1198 }
1199 else
1200 {
1201 now_floor = mn_now;
1202 ev_rt_now = ev_time ();
1203 return 1;
1204 }
1205 }
1206
1207 void inline_size
1208 time_update (EV_P)
1209 {
1210 int i;
1211
1212 #if EV_USE_MONOTONIC
1213 if (expect_true (have_monotonic))
1214 {
1215 if (time_update_monotonic (EV_A))
1216 {
1217 ev_tstamp odiff = rtmn_diff;
1218
1219 /* loop a few times, before making important decisions.
1220 * on the choice of "4": one iteration isn't enough,
1221 * in case we get preempted during the calls to
1222 * ev_time and get_clock. a second call is almost guarenteed
1223 * to succeed in that case, though. and looping a few more times
1224 * doesn't hurt either as we only do this on time-jumps or
1225 * in the unlikely event of getting preempted here.
1226 */
1227 for (i = 4; --i; )
1228 {
1229 rtmn_diff = ev_rt_now - mn_now;
1230
1231 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1232 return; /* all is well */
1233
1234 ev_rt_now = ev_time ();
1235 mn_now = get_clock ();
1236 now_floor = mn_now;
1237 }
1238
1239 # if EV_PERIODIC_ENABLE
1240 periodics_reschedule (EV_A);
1241 # endif
1242 /* no timer adjustment, as the monotonic clock doesn't jump */
1243 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1244 }
1245 }
1246 else
1247 #endif
1248 {
1249 ev_rt_now = ev_time ();
1250
1251 if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
1252 {
1253 #if EV_PERIODIC_ENABLE
1254 periodics_reschedule (EV_A);
1255 #endif
1256
1257 /* adjust timers. this is easy, as the offset is the same for all */
1258 for (i = 0; i < timercnt; ++i)
1259 ((WT)timers [i])->at += ev_rt_now - mn_now;
1260 }
1261
1262 mn_now = ev_rt_now;
1263 }
1264 }
1265
1266 void
1267 ev_ref (EV_P)
1268 {
1269 ++activecnt;
1270 }
1271
1272 void
1273 ev_unref (EV_P)
1274 {
1275 --activecnt;
1276 }
1277
1278 static int loop_done;
1279
1280 void
1281 ev_loop (EV_P_ int flags)
1282 {
1283 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1284 ? EVUNLOOP_ONE
1285 : EVUNLOOP_CANCEL;
1286
1287 while (activecnt)
1288 {
1289 /* we might have forked, so reify kernel state if necessary */
1290 #if EV_FORK_ENABLE
1291 if (expect_false (postfork))
1292 if (forkcnt)
1293 {
1294 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1295 call_pending (EV_A);
1296 }
1297 #endif
1298
1299 /* queue check watchers (and execute them) */
1300 if (expect_false (preparecnt))
1301 {
1302 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1303 call_pending (EV_A);
1304 }
1305
1306 /* we might have forked, so reify kernel state if necessary */
1307 if (expect_false (postfork))
1308 loop_fork (EV_A);
1309
1310 /* update fd-related kernel structures */
1311 fd_reify (EV_A);
1312
1313 /* calculate blocking time */
1314 {
1315 double block;
1316
1317 if (flags & EVLOOP_NONBLOCK || idlecnt)
1318 block = 0.; /* do not block at all */
1319 else
1320 {
1321 /* update time to cancel out callback processing overhead */
1322 #if EV_USE_MONOTONIC
1323 if (expect_true (have_monotonic))
1324 time_update_monotonic (EV_A);
1325 else
1326 #endif
1327 {
1328 ev_rt_now = ev_time ();
1329 mn_now = ev_rt_now;
1330 }
1331
1332 block = MAX_BLOCKTIME;
1333
1334 if (timercnt)
1335 {
1336 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1337 if (block > to) block = to;
1338 }
1339
1340 #if EV_PERIODIC_ENABLE
1341 if (periodiccnt)
1342 {
1343 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1344 if (block > to) block = to;
1345 }
1346 #endif
1347
1348 if (expect_false (block < 0.)) block = 0.;
1349 }
1350
1351 backend_poll (EV_A_ block);
1352 }
1353
1354 /* update ev_rt_now, do magic */
1355 time_update (EV_A);
1356
1357 /* queue pending timers and reschedule them */
1358 timers_reify (EV_A); /* relative timers called last */
1359 #if EV_PERIODIC_ENABLE
1360 periodics_reify (EV_A); /* absolute timers called first */
1361 #endif
1362
1363 /* queue idle watchers unless other events are pending */
1364 if (idlecnt && !any_pending (EV_A))
1365 queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
1366
1367 /* queue check watchers, to be executed first */
1368 if (expect_false (checkcnt))
1369 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1370
1371 call_pending (EV_A);
1372
1373 if (expect_false (loop_done))
1374 break;
1375 }
1376
1377 if (loop_done == EVUNLOOP_ONE)
1378 loop_done = EVUNLOOP_CANCEL;
1379 }
1380
1381 void
1382 ev_unloop (EV_P_ int how)
1383 {
1384 loop_done = how;
1385 }
1386
1387 /*****************************************************************************/
1388
1389 void inline_size
1390 wlist_add (WL *head, WL elem)
1391 {
1392 elem->next = *head;
1393 *head = elem;
1394 }
1395
1396 void inline_size
1397 wlist_del (WL *head, WL elem)
1398 {
1399 while (*head)
1400 {
1401 if (*head == elem)
1402 {
1403 *head = elem->next;
1404 return;
1405 }
1406
1407 head = &(*head)->next;
1408 }
1409 }
1410
1411 void inline_speed
1412 ev_clear_pending (EV_P_ W w)
1413 {
1414 if (w->pending)
1415 {
1416 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1417 w->pending = 0;
1418 }
1419 }
1420
1421 void inline_speed
1422 ev_start (EV_P_ W w, int active)
1423 {
1424 if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
1425 if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
1426
1427 w->active = active;
1428 ev_ref (EV_A);
1429 }
1430
1431 void inline_size
1432 ev_stop (EV_P_ W w)
1433 {
1434 ev_unref (EV_A);
1435 w->active = 0;
1436 }
1437
1438 /*****************************************************************************/
1439
1440 void
1441 ev_io_start (EV_P_ ev_io *w)
1442 {
1443 int fd = w->fd;
1444
1445 if (expect_false (ev_is_active (w)))
1446 return;
1447
1448 assert (("ev_io_start called with negative fd", fd >= 0));
1449
1450 ev_start (EV_A_ (W)w, 1);
1451 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1452 wlist_add ((WL *)&anfds[fd].head, (WL)w);
1453
1454 fd_change (EV_A_ fd);
1455 }
1456
1457 void
1458 ev_io_stop (EV_P_ ev_io *w)
1459 {
1460 ev_clear_pending (EV_A_ (W)w);
1461 if (expect_false (!ev_is_active (w)))
1462 return;
1463
1464 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1465
1466 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
1467 ev_stop (EV_A_ (W)w);
1468
1469 fd_change (EV_A_ w->fd);
1470 }
1471
1472 void
1473 ev_timer_start (EV_P_ ev_timer *w)
1474 {
1475 if (expect_false (ev_is_active (w)))
1476 return;
1477
1478 ((WT)w)->at += mn_now;
1479
1480 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1481
1482 ev_start (EV_A_ (W)w, ++timercnt);
1483 array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
1484 timers [timercnt - 1] = w;
1485 upheap ((WT *)timers, timercnt - 1);
1486
1487 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1488 }
1489
1490 void
1491 ev_timer_stop (EV_P_ ev_timer *w)
1492 {
1493 ev_clear_pending (EV_A_ (W)w);
1494 if (expect_false (!ev_is_active (w)))
1495 return;
1496
1497 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1498
1499 if (expect_true (((W)w)->active < timercnt--))
1500 {
1501 timers [((W)w)->active - 1] = timers [timercnt];
1502 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1503 }
1504
1505 ((WT)w)->at -= mn_now;
1506
1507 ev_stop (EV_A_ (W)w);
1508 }
1509
1510 void
1511 ev_timer_again (EV_P_ ev_timer *w)
1512 {
1513 if (ev_is_active (w))
1514 {
1515 if (w->repeat)
1516 {
1517 ((WT)w)->at = mn_now + w->repeat;
1518 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1519 }
1520 else
1521 ev_timer_stop (EV_A_ w);
1522 }
1523 else if (w->repeat)
1524 {
1525 w->at = w->repeat;
1526 ev_timer_start (EV_A_ w);
1527 }
1528 }
1529
1530 #if EV_PERIODIC_ENABLE
1531 void
1532 ev_periodic_start (EV_P_ ev_periodic *w)
1533 {
1534 if (expect_false (ev_is_active (w)))
1535 return;
1536
1537 if (w->reschedule_cb)
1538 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1539 else if (w->interval)
1540 {
1541 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1542 /* this formula differs from the one in periodic_reify because we do not always round up */
1543 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1544 }
1545
1546 ev_start (EV_A_ (W)w, ++periodiccnt);
1547 array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
1548 periodics [periodiccnt - 1] = w;
1549 upheap ((WT *)periodics, periodiccnt - 1);
1550
1551 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1552 }
1553
1554 void
1555 ev_periodic_stop (EV_P_ ev_periodic *w)
1556 {
1557 ev_clear_pending (EV_A_ (W)w);
1558 if (expect_false (!ev_is_active (w)))
1559 return;
1560
1561 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1562
1563 if (expect_true (((W)w)->active < periodiccnt--))
1564 {
1565 periodics [((W)w)->active - 1] = periodics [periodiccnt];
1566 adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
1567 }
1568
1569 ev_stop (EV_A_ (W)w);
1570 }
1571
1572 void
1573 ev_periodic_again (EV_P_ ev_periodic *w)
1574 {
1575 /* TODO: use adjustheap and recalculation */
1576 ev_periodic_stop (EV_A_ w);
1577 ev_periodic_start (EV_A_ w);
1578 }
1579 #endif
1580
1581 #ifndef SA_RESTART
1582 # define SA_RESTART 0
1583 #endif
1584
1585 void
1586 ev_signal_start (EV_P_ ev_signal *w)
1587 {
1588 #if EV_MULTIPLICITY
1589 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1590 #endif
1591 if (expect_false (ev_is_active (w)))
1592 return;
1593
1594 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1595
1596 ev_start (EV_A_ (W)w, 1);
1597 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1598 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
1599
1600 if (!((WL)w)->next)
1601 {
1602 #if _WIN32
1603 signal (w->signum, sighandler);
1604 #else
1605 struct sigaction sa;
1606 sa.sa_handler = sighandler;
1607 sigfillset (&sa.sa_mask);
1608 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1609 sigaction (w->signum, &sa, 0);
1610 #endif
1611 }
1612 }
1613
1614 void
1615 ev_signal_stop (EV_P_ ev_signal *w)
1616 {
1617 ev_clear_pending (EV_A_ (W)w);
1618 if (expect_false (!ev_is_active (w)))
1619 return;
1620
1621 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1622 ev_stop (EV_A_ (W)w);
1623
1624 if (!signals [w->signum - 1].head)
1625 signal (w->signum, SIG_DFL);
1626 }
1627
1628 void
1629 ev_child_start (EV_P_ ev_child *w)
1630 {
1631 #if EV_MULTIPLICITY
1632 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1633 #endif
1634 if (expect_false (ev_is_active (w)))
1635 return;
1636
1637 ev_start (EV_A_ (W)w, 1);
1638 wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1639 }
1640
1641 void
1642 ev_child_stop (EV_P_ ev_child *w)
1643 {
1644 ev_clear_pending (EV_A_ (W)w);
1645 if (expect_false (!ev_is_active (w)))
1646 return;
1647
1648 wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1649 ev_stop (EV_A_ (W)w);
1650 }
1651
1652 #if EV_STAT_ENABLE
1653
1654 # ifdef _WIN32
1655 # undef lstat
1656 # define lstat(a,b) _stati64 (a,b)
1657 # endif
1658
1659 #define DEF_STAT_INTERVAL 5.0074891
1660 #define MIN_STAT_INTERVAL 0.1074891
1661
1662 void
1663 ev_stat_stat (EV_P_ ev_stat *w)
1664 {
1665 if (lstat (w->path, &w->attr) < 0)
1666 w->attr.st_nlink = 0;
1667 else if (!w->attr.st_nlink)
1668 w->attr.st_nlink = 1;
1669 }
1670
1671 static void
1672 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
1673 {
1674 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
1675
1676 /* we copy this here each the time so that */
1677 /* prev has the old value when the callback gets invoked */
1678 w->prev = w->attr;
1679 ev_stat_stat (EV_A_ w);
1680
1681 if (memcmp (&w->prev, &w->attr, sizeof (ev_statdata)))
1682 ev_feed_event (EV_A_ w, EV_STAT);
1683 }
1684
1685 void
1686 ev_stat_start (EV_P_ ev_stat *w)
1687 {
1688 if (expect_false (ev_is_active (w)))
1689 return;
1690
1691 /* since we use memcmp, we need to clear any padding data etc. */
1692 memset (&w->prev, 0, sizeof (ev_statdata));
1693 memset (&w->attr, 0, sizeof (ev_statdata));
1694
1695 ev_stat_stat (EV_A_ w);
1696
1697 if (w->interval < MIN_STAT_INTERVAL)
1698 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
1699
1700 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
1701 ev_set_priority (&w->timer, ev_priority (w));
1702 ev_timer_start (EV_A_ &w->timer);
1703
1704 ev_start (EV_A_ (W)w, 1);
1705 }
1706
1707 void
1708 ev_stat_stop (EV_P_ ev_stat *w)
1709 {
1710 ev_clear_pending (EV_A_ (W)w);
1711 if (expect_false (!ev_is_active (w)))
1712 return;
1713
1714 ev_timer_stop (EV_A_ &w->timer);
1715
1716 ev_stop (EV_A_ (W)w);
1717 }
1718 #endif
1719
1720 void
1721 ev_idle_start (EV_P_ ev_idle *w)
1722 {
1723 if (expect_false (ev_is_active (w)))
1724 return;
1725
1726 ev_start (EV_A_ (W)w, ++idlecnt);
1727 array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
1728 idles [idlecnt - 1] = w;
1729 }
1730
1731 void
1732 ev_idle_stop (EV_P_ ev_idle *w)
1733 {
1734 ev_clear_pending (EV_A_ (W)w);
1735 if (expect_false (!ev_is_active (w)))
1736 return;
1737
1738 {
1739 int active = ((W)w)->active;
1740 idles [active - 1] = idles [--idlecnt];
1741 ((W)idles [active - 1])->active = active;
1742 }
1743
1744 ev_stop (EV_A_ (W)w);
1745 }
1746
1747 void
1748 ev_prepare_start (EV_P_ ev_prepare *w)
1749 {
1750 if (expect_false (ev_is_active (w)))
1751 return;
1752
1753 ev_start (EV_A_ (W)w, ++preparecnt);
1754 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
1755 prepares [preparecnt - 1] = w;
1756 }
1757
1758 void
1759 ev_prepare_stop (EV_P_ ev_prepare *w)
1760 {
1761 ev_clear_pending (EV_A_ (W)w);
1762 if (expect_false (!ev_is_active (w)))
1763 return;
1764
1765 {
1766 int active = ((W)w)->active;
1767 prepares [active - 1] = prepares [--preparecnt];
1768 ((W)prepares [active - 1])->active = active;
1769 }
1770
1771 ev_stop (EV_A_ (W)w);
1772 }
1773
1774 void
1775 ev_check_start (EV_P_ ev_check *w)
1776 {
1777 if (expect_false (ev_is_active (w)))
1778 return;
1779
1780 ev_start (EV_A_ (W)w, ++checkcnt);
1781 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
1782 checks [checkcnt - 1] = w;
1783 }
1784
1785 void
1786 ev_check_stop (EV_P_ ev_check *w)
1787 {
1788 ev_clear_pending (EV_A_ (W)w);
1789 if (expect_false (!ev_is_active (w)))
1790 return;
1791
1792 {
1793 int active = ((W)w)->active;
1794 checks [active - 1] = checks [--checkcnt];
1795 ((W)checks [active - 1])->active = active;
1796 }
1797
1798 ev_stop (EV_A_ (W)w);
1799 }
1800
1801 #if EV_EMBED_ENABLE
1802 void noinline
1803 ev_embed_sweep (EV_P_ ev_embed *w)
1804 {
1805 ev_loop (w->loop, EVLOOP_NONBLOCK);
1806 }
1807
1808 static void
1809 embed_cb (EV_P_ ev_io *io, int revents)
1810 {
1811 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
1812
1813 if (ev_cb (w))
1814 ev_feed_event (EV_A_ (W)w, EV_EMBED);
1815 else
1816 ev_embed_sweep (loop, w);
1817 }
1818
1819 void
1820 ev_embed_start (EV_P_ ev_embed *w)
1821 {
1822 if (expect_false (ev_is_active (w)))
1823 return;
1824
1825 {
1826 struct ev_loop *loop = w->loop;
1827 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
1828 ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
1829 }
1830
1831 ev_set_priority (&w->io, ev_priority (w));
1832 ev_io_start (EV_A_ &w->io);
1833
1834 ev_start (EV_A_ (W)w, 1);
1835 }
1836
1837 void
1838 ev_embed_stop (EV_P_ ev_embed *w)
1839 {
1840 ev_clear_pending (EV_A_ (W)w);
1841 if (expect_false (!ev_is_active (w)))
1842 return;
1843
1844 ev_io_stop (EV_A_ &w->io);
1845
1846 ev_stop (EV_A_ (W)w);
1847 }
1848 #endif
1849
1850 #if EV_FORK_ENABLE
1851 void
1852 ev_fork_start (EV_P_ ev_fork *w)
1853 {
1854 if (expect_false (ev_is_active (w)))
1855 return;
1856
1857 ev_start (EV_A_ (W)w, ++forkcnt);
1858 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
1859 forks [forkcnt - 1] = w;
1860 }
1861
1862 void
1863 ev_fork_stop (EV_P_ ev_fork *w)
1864 {
1865 ev_clear_pending (EV_A_ (W)w);
1866 if (expect_false (!ev_is_active (w)))
1867 return;
1868
1869 {
1870 int active = ((W)w)->active;
1871 forks [active - 1] = forks [--forkcnt];
1872 ((W)forks [active - 1])->active = active;
1873 }
1874
1875 ev_stop (EV_A_ (W)w);
1876 }
1877 #endif
1878
1879 /*****************************************************************************/
1880
1881 struct ev_once
1882 {
1883 ev_io io;
1884 ev_timer to;
1885 void (*cb)(int revents, void *arg);
1886 void *arg;
1887 };
1888
1889 static void
1890 once_cb (EV_P_ struct ev_once *once, int revents)
1891 {
1892 void (*cb)(int revents, void *arg) = once->cb;
1893 void *arg = once->arg;
1894
1895 ev_io_stop (EV_A_ &once->io);
1896 ev_timer_stop (EV_A_ &once->to);
1897 ev_free (once);
1898
1899 cb (revents, arg);
1900 }
1901
1902 static void
1903 once_cb_io (EV_P_ ev_io *w, int revents)
1904 {
1905 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
1906 }
1907
1908 static void
1909 once_cb_to (EV_P_ ev_timer *w, int revents)
1910 {
1911 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
1912 }
1913
1914 void
1915 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
1916 {
1917 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
1918
1919 if (expect_false (!once))
1920 {
1921 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
1922 return;
1923 }
1924
1925 once->cb = cb;
1926 once->arg = arg;
1927
1928 ev_init (&once->io, once_cb_io);
1929 if (fd >= 0)
1930 {
1931 ev_io_set (&once->io, fd, events);
1932 ev_io_start (EV_A_ &once->io);
1933 }
1934
1935 ev_init (&once->to, once_cb_to);
1936 if (timeout >= 0.)
1937 {
1938 ev_timer_set (&once->to, timeout, 0.);
1939 ev_timer_start (EV_A_ &once->to);
1940 }
1941 }
1942
1943 #ifdef __cplusplus
1944 }
1945 #endif
1946