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Revision: 1.141
Committed: Mon Nov 26 20:33:58 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.140: +22 -20 lines
Log Message:
misc

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 #ifndef WCONTINUED
721 # define WCONTINUED 0
722 #endif
723
724 void inline_speed
725 child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
726 {
727 ev_child *w;
728
729 for (w = (ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
730 if (w->pid == pid || !w->pid)
731 {
732 ev_priority (w) = ev_priority (sw); /* need to do it *now* */
733 w->rpid = pid;
734 w->rstatus = status;
735 ev_feed_event (EV_A_ (W)w, EV_CHILD);
736 }
737 }
738
739 static void
740 childcb (EV_P_ ev_signal *sw, int revents)
741 {
742 int pid, status;
743
744 if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
745 {
746 /* make sure we are called again until all childs have been reaped */
747 /* we need to do it this way so that the callback gets called before we continue */
748 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
749
750 child_reap (EV_A_ sw, pid, pid, status);
751 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
752 }
753 }
754
755 #endif
756
757 /*****************************************************************************/
758
759 #if EV_USE_PORT
760 # include "ev_port.c"
761 #endif
762 #if EV_USE_KQUEUE
763 # include "ev_kqueue.c"
764 #endif
765 #if EV_USE_EPOLL
766 # include "ev_epoll.c"
767 #endif
768 #if EV_USE_POLL
769 # include "ev_poll.c"
770 #endif
771 #if EV_USE_SELECT
772 # include "ev_select.c"
773 #endif
774
775 int
776 ev_version_major (void)
777 {
778 return EV_VERSION_MAJOR;
779 }
780
781 int
782 ev_version_minor (void)
783 {
784 return EV_VERSION_MINOR;
785 }
786
787 /* return true if we are running with elevated privileges and should ignore env variables */
788 int inline_size
789 enable_secure (void)
790 {
791 #ifdef _WIN32
792 return 0;
793 #else
794 return getuid () != geteuid ()
795 || getgid () != getegid ();
796 #endif
797 }
798
799 unsigned int
800 ev_supported_backends (void)
801 {
802 unsigned int flags = 0;
803
804 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
805 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
806 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
807 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
808 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
809
810 return flags;
811 }
812
813 unsigned int
814 ev_recommended_backends (void)
815 {
816 unsigned int flags = ev_supported_backends ();
817
818 #ifndef __NetBSD__
819 /* kqueue is borked on everything but netbsd apparently */
820 /* it usually doesn't work correctly on anything but sockets and pipes */
821 flags &= ~EVBACKEND_KQUEUE;
822 #endif
823 #ifdef __APPLE__
824 // flags &= ~EVBACKEND_KQUEUE; for documentation
825 flags &= ~EVBACKEND_POLL;
826 #endif
827
828 return flags;
829 }
830
831 unsigned int
832 ev_embeddable_backends (void)
833 {
834 return EVBACKEND_EPOLL
835 | EVBACKEND_KQUEUE
836 | EVBACKEND_PORT;
837 }
838
839 unsigned int
840 ev_backend (EV_P)
841 {
842 return backend;
843 }
844
845 static void
846 loop_init (EV_P_ unsigned int flags)
847 {
848 if (!backend)
849 {
850 #if EV_USE_MONOTONIC
851 {
852 struct timespec ts;
853 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
854 have_monotonic = 1;
855 }
856 #endif
857
858 ev_rt_now = ev_time ();
859 mn_now = get_clock ();
860 now_floor = mn_now;
861 rtmn_diff = ev_rt_now - mn_now;
862
863 if (!(flags & EVFLAG_NOENV)
864 && !enable_secure ()
865 && getenv ("LIBEV_FLAGS"))
866 flags = atoi (getenv ("LIBEV_FLAGS"));
867
868 if (!(flags & 0x0000ffffUL))
869 flags |= ev_recommended_backends ();
870
871 backend = 0;
872 #if EV_USE_PORT
873 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
874 #endif
875 #if EV_USE_KQUEUE
876 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
877 #endif
878 #if EV_USE_EPOLL
879 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
880 #endif
881 #if EV_USE_POLL
882 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
883 #endif
884 #if EV_USE_SELECT
885 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
886 #endif
887
888 ev_init (&sigev, sigcb);
889 ev_set_priority (&sigev, EV_MAXPRI);
890 }
891 }
892
893 static void
894 loop_destroy (EV_P)
895 {
896 int i;
897
898 #if EV_USE_PORT
899 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
900 #endif
901 #if EV_USE_KQUEUE
902 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
903 #endif
904 #if EV_USE_EPOLL
905 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
906 #endif
907 #if EV_USE_POLL
908 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
909 #endif
910 #if EV_USE_SELECT
911 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
912 #endif
913
914 for (i = NUMPRI; i--; )
915 array_free (pending, [i]);
916
917 /* have to use the microsoft-never-gets-it-right macro */
918 array_free (fdchange, EMPTY0);
919 array_free (timer, EMPTY0);
920 #if EV_PERIODIC_ENABLE
921 array_free (periodic, EMPTY0);
922 #endif
923 array_free (idle, EMPTY0);
924 array_free (prepare, EMPTY0);
925 array_free (check, EMPTY0);
926
927 backend = 0;
928 }
929
930 static void
931 loop_fork (EV_P)
932 {
933 #if EV_USE_PORT
934 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
935 #endif
936 #if EV_USE_KQUEUE
937 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
938 #endif
939 #if EV_USE_EPOLL
940 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
941 #endif
942
943 if (ev_is_active (&sigev))
944 {
945 /* default loop */
946
947 ev_ref (EV_A);
948 ev_io_stop (EV_A_ &sigev);
949 close (sigpipe [0]);
950 close (sigpipe [1]);
951
952 while (pipe (sigpipe))
953 syserr ("(libev) error creating pipe");
954
955 siginit (EV_A);
956 }
957
958 postfork = 0;
959 }
960
961 #if EV_MULTIPLICITY
962 struct ev_loop *
963 ev_loop_new (unsigned int flags)
964 {
965 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
966
967 memset (loop, 0, sizeof (struct ev_loop));
968
969 loop_init (EV_A_ flags);
970
971 if (ev_backend (EV_A))
972 return loop;
973
974 return 0;
975 }
976
977 void
978 ev_loop_destroy (EV_P)
979 {
980 loop_destroy (EV_A);
981 ev_free (loop);
982 }
983
984 void
985 ev_loop_fork (EV_P)
986 {
987 postfork = 1;
988 }
989
990 #endif
991
992 #if EV_MULTIPLICITY
993 struct ev_loop *
994 ev_default_loop_init (unsigned int flags)
995 #else
996 int
997 ev_default_loop (unsigned int flags)
998 #endif
999 {
1000 if (sigpipe [0] == sigpipe [1])
1001 if (pipe (sigpipe))
1002 return 0;
1003
1004 if (!ev_default_loop_ptr)
1005 {
1006 #if EV_MULTIPLICITY
1007 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1008 #else
1009 ev_default_loop_ptr = 1;
1010 #endif
1011
1012 loop_init (EV_A_ flags);
1013
1014 if (ev_backend (EV_A))
1015 {
1016 siginit (EV_A);
1017
1018 #ifndef _WIN32
1019 ev_signal_init (&childev, childcb, SIGCHLD);
1020 ev_set_priority (&childev, EV_MAXPRI);
1021 ev_signal_start (EV_A_ &childev);
1022 ev_unref (EV_A); /* child watcher should not keep loop alive */
1023 #endif
1024 }
1025 else
1026 ev_default_loop_ptr = 0;
1027 }
1028
1029 return ev_default_loop_ptr;
1030 }
1031
1032 void
1033 ev_default_destroy (void)
1034 {
1035 #if EV_MULTIPLICITY
1036 struct ev_loop *loop = ev_default_loop_ptr;
1037 #endif
1038
1039 #ifndef _WIN32
1040 ev_ref (EV_A); /* child watcher */
1041 ev_signal_stop (EV_A_ &childev);
1042 #endif
1043
1044 ev_ref (EV_A); /* signal watcher */
1045 ev_io_stop (EV_A_ &sigev);
1046
1047 close (sigpipe [0]); sigpipe [0] = 0;
1048 close (sigpipe [1]); sigpipe [1] = 0;
1049
1050 loop_destroy (EV_A);
1051 }
1052
1053 void
1054 ev_default_fork (void)
1055 {
1056 #if EV_MULTIPLICITY
1057 struct ev_loop *loop = ev_default_loop_ptr;
1058 #endif
1059
1060 if (backend)
1061 postfork = 1;
1062 }
1063
1064 /*****************************************************************************/
1065
1066 int inline_size
1067 any_pending (EV_P)
1068 {
1069 int pri;
1070
1071 for (pri = NUMPRI; pri--; )
1072 if (pendingcnt [pri])
1073 return 1;
1074
1075 return 0;
1076 }
1077
1078 void inline_speed
1079 call_pending (EV_P)
1080 {
1081 int pri;
1082
1083 for (pri = NUMPRI; pri--; )
1084 while (pendingcnt [pri])
1085 {
1086 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1087
1088 if (expect_true (p->w))
1089 {
1090 assert (("non-pending watcher on pending list", p->w->pending));
1091
1092 p->w->pending = 0;
1093 EV_CB_INVOKE (p->w, p->events);
1094 }
1095 }
1096 }
1097
1098 void inline_size
1099 timers_reify (EV_P)
1100 {
1101 while (timercnt && ((WT)timers [0])->at <= mn_now)
1102 {
1103 ev_timer *w = timers [0];
1104
1105 assert (("inactive timer on timer heap detected", ev_is_active (w)));
1106
1107 /* first reschedule or stop timer */
1108 if (w->repeat)
1109 {
1110 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1111
1112 ((WT)w)->at += w->repeat;
1113 if (((WT)w)->at < mn_now)
1114 ((WT)w)->at = mn_now;
1115
1116 downheap ((WT *)timers, timercnt, 0);
1117 }
1118 else
1119 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1120
1121 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1122 }
1123 }
1124
1125 #if EV_PERIODIC_ENABLE
1126 void inline_size
1127 periodics_reify (EV_P)
1128 {
1129 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1130 {
1131 ev_periodic *w = periodics [0];
1132
1133 assert (("inactive timer on periodic heap detected", ev_is_active (w)));
1134
1135 /* first reschedule or stop timer */
1136 if (w->reschedule_cb)
1137 {
1138 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
1139 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1140 downheap ((WT *)periodics, periodiccnt, 0);
1141 }
1142 else if (w->interval)
1143 {
1144 ((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
1145 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1146 downheap ((WT *)periodics, periodiccnt, 0);
1147 }
1148 else
1149 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1150
1151 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1152 }
1153 }
1154
1155 static void noinline
1156 periodics_reschedule (EV_P)
1157 {
1158 int i;
1159
1160 /* adjust periodics after time jump */
1161 for (i = 0; i < periodiccnt; ++i)
1162 {
1163 ev_periodic *w = periodics [i];
1164
1165 if (w->reschedule_cb)
1166 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1167 else if (w->interval)
1168 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1169 }
1170
1171 /* now rebuild the heap */
1172 for (i = periodiccnt >> 1; i--; )
1173 downheap ((WT *)periodics, periodiccnt, i);
1174 }
1175 #endif
1176
1177 int inline_size
1178 time_update_monotonic (EV_P)
1179 {
1180 mn_now = get_clock ();
1181
1182 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1183 {
1184 ev_rt_now = rtmn_diff + mn_now;
1185 return 0;
1186 }
1187 else
1188 {
1189 now_floor = mn_now;
1190 ev_rt_now = ev_time ();
1191 return 1;
1192 }
1193 }
1194
1195 void inline_size
1196 time_update (EV_P)
1197 {
1198 int i;
1199
1200 #if EV_USE_MONOTONIC
1201 if (expect_true (have_monotonic))
1202 {
1203 if (time_update_monotonic (EV_A))
1204 {
1205 ev_tstamp odiff = rtmn_diff;
1206
1207 /* loop a few times, before making important decisions.
1208 * on the choice of "4": one iteration isn't enough,
1209 * in case we get preempted during the calls to
1210 * ev_time and get_clock. a second call is almost guarenteed
1211 * to succeed in that case, though. and looping a few more times
1212 * doesn't hurt either as we only do this on time-jumps or
1213 * in the unlikely event of getting preempted here.
1214 */
1215 for (i = 4; --i; )
1216 {
1217 rtmn_diff = ev_rt_now - mn_now;
1218
1219 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1220 return; /* all is well */
1221
1222 ev_rt_now = ev_time ();
1223 mn_now = get_clock ();
1224 now_floor = mn_now;
1225 }
1226
1227 # if EV_PERIODIC_ENABLE
1228 periodics_reschedule (EV_A);
1229 # endif
1230 /* no timer adjustment, as the monotonic clock doesn't jump */
1231 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1232 }
1233 }
1234 else
1235 #endif
1236 {
1237 ev_rt_now = ev_time ();
1238
1239 if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
1240 {
1241 #if EV_PERIODIC_ENABLE
1242 periodics_reschedule (EV_A);
1243 #endif
1244
1245 /* adjust timers. this is easy, as the offset is the same for all */
1246 for (i = 0; i < timercnt; ++i)
1247 ((WT)timers [i])->at += ev_rt_now - mn_now;
1248 }
1249
1250 mn_now = ev_rt_now;
1251 }
1252 }
1253
1254 void
1255 ev_ref (EV_P)
1256 {
1257 ++activecnt;
1258 }
1259
1260 void
1261 ev_unref (EV_P)
1262 {
1263 --activecnt;
1264 }
1265
1266 static int loop_done;
1267
1268 void
1269 ev_loop (EV_P_ int flags)
1270 {
1271 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1272 ? EVUNLOOP_ONE
1273 : EVUNLOOP_CANCEL;
1274
1275 while (activecnt)
1276 {
1277 /* queue check watchers (and execute them) */
1278 if (expect_false (preparecnt))
1279 {
1280 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1281 call_pending (EV_A);
1282 }
1283
1284 /* we might have forked, so reify kernel state if necessary */
1285 if (expect_false (postfork))
1286 loop_fork (EV_A);
1287
1288 /* update fd-related kernel structures */
1289 fd_reify (EV_A);
1290
1291 /* calculate blocking time */
1292 {
1293 double block;
1294
1295 if (flags & EVLOOP_NONBLOCK || idlecnt)
1296 block = 0.; /* do not block at all */
1297 else
1298 {
1299 /* update time to cancel out callback processing overhead */
1300 #if EV_USE_MONOTONIC
1301 if (expect_true (have_monotonic))
1302 time_update_monotonic (EV_A);
1303 else
1304 #endif
1305 {
1306 ev_rt_now = ev_time ();
1307 mn_now = ev_rt_now;
1308 }
1309
1310 block = MAX_BLOCKTIME;
1311
1312 if (timercnt)
1313 {
1314 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1315 if (block > to) block = to;
1316 }
1317
1318 #if EV_PERIODIC_ENABLE
1319 if (periodiccnt)
1320 {
1321 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1322 if (block > to) block = to;
1323 }
1324 #endif
1325
1326 if (expect_false (block < 0.)) block = 0.;
1327 }
1328
1329 backend_poll (EV_A_ block);
1330 }
1331
1332 /* update ev_rt_now, do magic */
1333 time_update (EV_A);
1334
1335 /* queue pending timers and reschedule them */
1336 timers_reify (EV_A); /* relative timers called last */
1337 #if EV_PERIODIC_ENABLE
1338 periodics_reify (EV_A); /* absolute timers called first */
1339 #endif
1340
1341 /* queue idle watchers unless other events are pending */
1342 if (idlecnt && !any_pending (EV_A))
1343 queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
1344
1345 /* queue check watchers, to be executed first */
1346 if (expect_false (checkcnt))
1347 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1348
1349 call_pending (EV_A);
1350
1351 if (expect_false (loop_done))
1352 break;
1353 }
1354
1355 if (loop_done == EVUNLOOP_ONE)
1356 loop_done = EVUNLOOP_CANCEL;
1357 }
1358
1359 void
1360 ev_unloop (EV_P_ int how)
1361 {
1362 loop_done = how;
1363 }
1364
1365 /*****************************************************************************/
1366
1367 void inline_size
1368 wlist_add (WL *head, WL elem)
1369 {
1370 elem->next = *head;
1371 *head = elem;
1372 }
1373
1374 void inline_size
1375 wlist_del (WL *head, WL elem)
1376 {
1377 while (*head)
1378 {
1379 if (*head == elem)
1380 {
1381 *head = elem->next;
1382 return;
1383 }
1384
1385 head = &(*head)->next;
1386 }
1387 }
1388
1389 void inline_speed
1390 ev_clear_pending (EV_P_ W w)
1391 {
1392 if (w->pending)
1393 {
1394 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1395 w->pending = 0;
1396 }
1397 }
1398
1399 void inline_speed
1400 ev_start (EV_P_ W w, int active)
1401 {
1402 if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
1403 if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
1404
1405 w->active = active;
1406 ev_ref (EV_A);
1407 }
1408
1409 void inline_size
1410 ev_stop (EV_P_ W w)
1411 {
1412 ev_unref (EV_A);
1413 w->active = 0;
1414 }
1415
1416 /*****************************************************************************/
1417
1418 void
1419 ev_io_start (EV_P_ ev_io *w)
1420 {
1421 int fd = w->fd;
1422
1423 if (expect_false (ev_is_active (w)))
1424 return;
1425
1426 assert (("ev_io_start called with negative fd", fd >= 0));
1427
1428 ev_start (EV_A_ (W)w, 1);
1429 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1430 wlist_add ((WL *)&anfds[fd].head, (WL)w);
1431
1432 fd_change (EV_A_ fd);
1433 }
1434
1435 void
1436 ev_io_stop (EV_P_ ev_io *w)
1437 {
1438 ev_clear_pending (EV_A_ (W)w);
1439 if (expect_false (!ev_is_active (w)))
1440 return;
1441
1442 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1443
1444 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
1445 ev_stop (EV_A_ (W)w);
1446
1447 fd_change (EV_A_ w->fd);
1448 }
1449
1450 void
1451 ev_timer_start (EV_P_ ev_timer *w)
1452 {
1453 if (expect_false (ev_is_active (w)))
1454 return;
1455
1456 ((WT)w)->at += mn_now;
1457
1458 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1459
1460 ev_start (EV_A_ (W)w, ++timercnt);
1461 array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
1462 timers [timercnt - 1] = w;
1463 upheap ((WT *)timers, timercnt - 1);
1464
1465 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1466 }
1467
1468 void
1469 ev_timer_stop (EV_P_ ev_timer *w)
1470 {
1471 ev_clear_pending (EV_A_ (W)w);
1472 if (expect_false (!ev_is_active (w)))
1473 return;
1474
1475 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1476
1477 if (expect_true (((W)w)->active < timercnt--))
1478 {
1479 timers [((W)w)->active - 1] = timers [timercnt];
1480 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1481 }
1482
1483 ((WT)w)->at -= mn_now;
1484
1485 ev_stop (EV_A_ (W)w);
1486 }
1487
1488 void
1489 ev_timer_again (EV_P_ ev_timer *w)
1490 {
1491 if (ev_is_active (w))
1492 {
1493 if (w->repeat)
1494 {
1495 ((WT)w)->at = mn_now + w->repeat;
1496 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1497 }
1498 else
1499 ev_timer_stop (EV_A_ w);
1500 }
1501 else if (w->repeat)
1502 {
1503 w->at = w->repeat;
1504 ev_timer_start (EV_A_ w);
1505 }
1506 }
1507
1508 #if EV_PERIODIC_ENABLE
1509 void
1510 ev_periodic_start (EV_P_ ev_periodic *w)
1511 {
1512 if (expect_false (ev_is_active (w)))
1513 return;
1514
1515 if (w->reschedule_cb)
1516 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1517 else if (w->interval)
1518 {
1519 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1520 /* this formula differs from the one in periodic_reify because we do not always round up */
1521 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1522 }
1523
1524 ev_start (EV_A_ (W)w, ++periodiccnt);
1525 array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
1526 periodics [periodiccnt - 1] = w;
1527 upheap ((WT *)periodics, periodiccnt - 1);
1528
1529 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1530 }
1531
1532 void
1533 ev_periodic_stop (EV_P_ ev_periodic *w)
1534 {
1535 ev_clear_pending (EV_A_ (W)w);
1536 if (expect_false (!ev_is_active (w)))
1537 return;
1538
1539 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1540
1541 if (expect_true (((W)w)->active < periodiccnt--))
1542 {
1543 periodics [((W)w)->active - 1] = periodics [periodiccnt];
1544 adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
1545 }
1546
1547 ev_stop (EV_A_ (W)w);
1548 }
1549
1550 void
1551 ev_periodic_again (EV_P_ ev_periodic *w)
1552 {
1553 /* TODO: use adjustheap and recalculation */
1554 ev_periodic_stop (EV_A_ w);
1555 ev_periodic_start (EV_A_ w);
1556 }
1557 #endif
1558
1559 void
1560 ev_idle_start (EV_P_ ev_idle *w)
1561 {
1562 if (expect_false (ev_is_active (w)))
1563 return;
1564
1565 ev_start (EV_A_ (W)w, ++idlecnt);
1566 array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
1567 idles [idlecnt - 1] = w;
1568 }
1569
1570 void
1571 ev_idle_stop (EV_P_ ev_idle *w)
1572 {
1573 ev_clear_pending (EV_A_ (W)w);
1574 if (expect_false (!ev_is_active (w)))
1575 return;
1576
1577 {
1578 int active = ((W)w)->active;
1579 idles [active - 1] = idles [--idlecnt];
1580 ((W)idles [active - 1])->active = active;
1581 }
1582
1583 ev_stop (EV_A_ (W)w);
1584 }
1585
1586 void
1587 ev_prepare_start (EV_P_ ev_prepare *w)
1588 {
1589 if (expect_false (ev_is_active (w)))
1590 return;
1591
1592 ev_start (EV_A_ (W)w, ++preparecnt);
1593 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
1594 prepares [preparecnt - 1] = w;
1595 }
1596
1597 void
1598 ev_prepare_stop (EV_P_ ev_prepare *w)
1599 {
1600 ev_clear_pending (EV_A_ (W)w);
1601 if (expect_false (!ev_is_active (w)))
1602 return;
1603
1604 {
1605 int active = ((W)w)->active;
1606 prepares [active - 1] = prepares [--preparecnt];
1607 ((W)prepares [active - 1])->active = active;
1608 }
1609
1610 ev_stop (EV_A_ (W)w);
1611 }
1612
1613 void
1614 ev_check_start (EV_P_ ev_check *w)
1615 {
1616 if (expect_false (ev_is_active (w)))
1617 return;
1618
1619 ev_start (EV_A_ (W)w, ++checkcnt);
1620 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
1621 checks [checkcnt - 1] = w;
1622 }
1623
1624 void
1625 ev_check_stop (EV_P_ ev_check *w)
1626 {
1627 ev_clear_pending (EV_A_ (W)w);
1628 if (expect_false (!ev_is_active (w)))
1629 return;
1630
1631 {
1632 int active = ((W)w)->active;
1633 checks [active - 1] = checks [--checkcnt];
1634 ((W)checks [active - 1])->active = active;
1635 }
1636
1637 ev_stop (EV_A_ (W)w);
1638 }
1639
1640 #ifndef SA_RESTART
1641 # define SA_RESTART 0
1642 #endif
1643
1644 void
1645 ev_signal_start (EV_P_ ev_signal *w)
1646 {
1647 #if EV_MULTIPLICITY
1648 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1649 #endif
1650 if (expect_false (ev_is_active (w)))
1651 return;
1652
1653 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1654
1655 ev_start (EV_A_ (W)w, 1);
1656 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1657 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
1658
1659 if (!((WL)w)->next)
1660 {
1661 #if _WIN32
1662 signal (w->signum, sighandler);
1663 #else
1664 struct sigaction sa;
1665 sa.sa_handler = sighandler;
1666 sigfillset (&sa.sa_mask);
1667 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1668 sigaction (w->signum, &sa, 0);
1669 #endif
1670 }
1671 }
1672
1673 void
1674 ev_signal_stop (EV_P_ ev_signal *w)
1675 {
1676 ev_clear_pending (EV_A_ (W)w);
1677 if (expect_false (!ev_is_active (w)))
1678 return;
1679
1680 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1681 ev_stop (EV_A_ (W)w);
1682
1683 if (!signals [w->signum - 1].head)
1684 signal (w->signum, SIG_DFL);
1685 }
1686
1687 void
1688 ev_child_start (EV_P_ ev_child *w)
1689 {
1690 #if EV_MULTIPLICITY
1691 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1692 #endif
1693 if (expect_false (ev_is_active (w)))
1694 return;
1695
1696 ev_start (EV_A_ (W)w, 1);
1697 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1698 }
1699
1700 void
1701 ev_child_stop (EV_P_ ev_child *w)
1702 {
1703 ev_clear_pending (EV_A_ (W)w);
1704 if (expect_false (!ev_is_active (w)))
1705 return;
1706
1707 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1708 ev_stop (EV_A_ (W)w);
1709 }
1710
1711 #if EV_EMBED_ENABLE
1712 void noinline
1713 ev_embed_sweep (EV_P_ ev_embed *w)
1714 {
1715 ev_loop (w->loop, EVLOOP_NONBLOCK);
1716 }
1717
1718 static void
1719 embed_cb (EV_P_ ev_io *io, int revents)
1720 {
1721 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
1722
1723 if (ev_cb (w))
1724 ev_feed_event (EV_A_ (W)w, EV_EMBED);
1725 else
1726 ev_embed_sweep (loop, w);
1727 }
1728
1729 void
1730 ev_embed_start (EV_P_ ev_embed *w)
1731 {
1732 if (expect_false (ev_is_active (w)))
1733 return;
1734
1735 {
1736 struct ev_loop *loop = w->loop;
1737 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
1738 ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
1739 }
1740
1741 ev_set_priority (&w->io, ev_priority (w));
1742 ev_io_start (EV_A_ &w->io);
1743
1744 ev_start (EV_A_ (W)w, 1);
1745 }
1746
1747 void
1748 ev_embed_stop (EV_P_ ev_embed *w)
1749 {
1750 ev_clear_pending (EV_A_ (W)w);
1751 if (expect_false (!ev_is_active (w)))
1752 return;
1753
1754 ev_io_stop (EV_A_ &w->io);
1755
1756 ev_stop (EV_A_ (W)w);
1757 }
1758 #endif
1759
1760 #if EV_STAT_ENABLE
1761
1762 # ifdef _WIN32
1763 # define lstat(a,b) stat(a,b)
1764 # endif
1765
1766 void
1767 ev_stat_stat (EV_P_ ev_stat *w)
1768 {
1769 if (lstat (w->path, &w->attr) < 0)
1770 w->attr.st_nlink = 0;
1771 else if (!w->attr.st_nlink)
1772 w->attr.st_nlink = 1;
1773 }
1774
1775 static void
1776 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
1777 {
1778 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
1779
1780 /* we copy this here each the time so that */
1781 /* prev has the old value when the callback gets invoked */
1782 w->prev = w->attr;
1783 ev_stat_stat (EV_A_ w);
1784
1785 if (memcmp (&w->prev, &w->attr, sizeof (ev_statdata)))
1786 ev_feed_event (EV_A_ w, EV_STAT);
1787 }
1788
1789 void
1790 ev_stat_start (EV_P_ ev_stat *w)
1791 {
1792 if (expect_false (ev_is_active (w)))
1793 return;
1794
1795 /* since we use memcmp, we need to clear any padding data etc. */
1796 memset (&w->prev, 0, sizeof (ev_statdata));
1797 memset (&w->attr, 0, sizeof (ev_statdata));
1798
1799 ev_stat_stat (EV_A_ w);
1800
1801 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
1802 ev_set_priority (&w->timer, ev_priority (w));
1803 ev_timer_start (EV_A_ &w->timer);
1804
1805 ev_start (EV_A_ (W)w, 1);
1806 }
1807
1808 void
1809 ev_stat_stop (EV_P_ ev_stat *w)
1810 {
1811 ev_clear_pending (EV_A_ (W)w);
1812 if (expect_false (!ev_is_active (w)))
1813 return;
1814
1815 ev_timer_stop (EV_A_ &w->timer);
1816
1817 ev_stop (EV_A_ (W)w);
1818 }
1819 #endif
1820
1821 /*****************************************************************************/
1822
1823 struct ev_once
1824 {
1825 ev_io io;
1826 ev_timer to;
1827 void (*cb)(int revents, void *arg);
1828 void *arg;
1829 };
1830
1831 static void
1832 once_cb (EV_P_ struct ev_once *once, int revents)
1833 {
1834 void (*cb)(int revents, void *arg) = once->cb;
1835 void *arg = once->arg;
1836
1837 ev_io_stop (EV_A_ &once->io);
1838 ev_timer_stop (EV_A_ &once->to);
1839 ev_free (once);
1840
1841 cb (revents, arg);
1842 }
1843
1844 static void
1845 once_cb_io (EV_P_ ev_io *w, int revents)
1846 {
1847 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
1848 }
1849
1850 static void
1851 once_cb_to (EV_P_ ev_timer *w, int revents)
1852 {
1853 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
1854 }
1855
1856 void
1857 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
1858 {
1859 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
1860
1861 if (expect_false (!once))
1862 {
1863 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
1864 return;
1865 }
1866
1867 once->cb = cb;
1868 once->arg = arg;
1869
1870 ev_init (&once->io, once_cb_io);
1871 if (fd >= 0)
1872 {
1873 ev_io_set (&once->io, fd, events);
1874 ev_io_start (EV_A_ &once->io);
1875 }
1876
1877 ev_init (&once->to, once_cb_to);
1878 if (timeout >= 0.)
1879 {
1880 ev_timer_set (&once->to, timeout, 0.);
1881 ev_timer_start (EV_A_ &once->to);
1882 }
1883 }
1884
1885 #ifdef __cplusplus
1886 }
1887 #endif
1888