ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev.c
Revision: 1.142
Committed: Tue Nov 27 06:19:08 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.141: +16 -12 lines
Log Message:
try without wcontinued for borked systems

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