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Revision: 1.168
Committed: Sat Dec 8 14:12:07 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.167: +8 -1 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials provided
17 * with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifdef __cplusplus
33 extern "C" {
34 #endif
35
36 #ifndef EV_STANDALONE
37 # ifdef EV_CONFIG_H
38 # include EV_CONFIG_H
39 # else
40 # include "config.h"
41 # endif
42
43 # if HAVE_CLOCK_GETTIME
44 # ifndef EV_USE_MONOTONIC
45 # define EV_USE_MONOTONIC 1
46 # endif
47 # ifndef EV_USE_REALTIME
48 # define EV_USE_REALTIME 1
49 # endif
50 # else
51 # ifndef EV_USE_MONOTONIC
52 # define EV_USE_MONOTONIC 0
53 # endif
54 # ifndef EV_USE_REALTIME
55 # define EV_USE_REALTIME 0
56 # endif
57 # endif
58
59 # ifndef EV_USE_SELECT
60 # if HAVE_SELECT && HAVE_SYS_SELECT_H
61 # define EV_USE_SELECT 1
62 # else
63 # define EV_USE_SELECT 0
64 # endif
65 # endif
66
67 # ifndef EV_USE_POLL
68 # if HAVE_POLL && HAVE_POLL_H
69 # define EV_USE_POLL 1
70 # else
71 # define EV_USE_POLL 0
72 # endif
73 # endif
74
75 # ifndef EV_USE_EPOLL
76 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
77 # define EV_USE_EPOLL 1
78 # else
79 # define EV_USE_EPOLL 0
80 # endif
81 # endif
82
83 # ifndef EV_USE_KQUEUE
84 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
85 # define EV_USE_KQUEUE 1
86 # else
87 # define EV_USE_KQUEUE 0
88 # endif
89 # endif
90
91 # ifndef EV_USE_PORT
92 # if HAVE_PORT_H && HAVE_PORT_CREATE
93 # define EV_USE_PORT 1
94 # else
95 # define EV_USE_PORT 0
96 # endif
97 # endif
98
99 # ifndef EV_USE_INOTIFY
100 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
101 # define EV_USE_INOTIFY 1
102 # else
103 # define EV_USE_INOTIFY 0
104 # endif
105 # endif
106
107 #endif
108
109 #include <math.h>
110 #include <stdlib.h>
111 #include <fcntl.h>
112 #include <stddef.h>
113
114 #include <stdio.h>
115
116 #include <assert.h>
117 #include <errno.h>
118 #include <sys/types.h>
119 #include <time.h>
120
121 #include <signal.h>
122
123 #ifdef EV_H
124 # include EV_H
125 #else
126 # include "ev.h"
127 #endif
128
129 #ifndef _WIN32
130 # include <sys/time.h>
131 # include <sys/wait.h>
132 # include <unistd.h>
133 #else
134 # define WIN32_LEAN_AND_MEAN
135 # include <windows.h>
136 # ifndef EV_SELECT_IS_WINSOCKET
137 # define EV_SELECT_IS_WINSOCKET 1
138 # endif
139 #endif
140
141 /**/
142
143 #ifndef EV_USE_MONOTONIC
144 # define EV_USE_MONOTONIC 0
145 #endif
146
147 #ifndef EV_USE_REALTIME
148 # define EV_USE_REALTIME 0
149 #endif
150
151 #ifndef EV_USE_SELECT
152 # define EV_USE_SELECT 1
153 #endif
154
155 #ifndef EV_USE_POLL
156 # ifdef _WIN32
157 # define EV_USE_POLL 0
158 # else
159 # define EV_USE_POLL 1
160 # endif
161 #endif
162
163 #ifndef EV_USE_EPOLL
164 # define EV_USE_EPOLL 0
165 #endif
166
167 #ifndef EV_USE_KQUEUE
168 # define EV_USE_KQUEUE 0
169 #endif
170
171 #ifndef EV_USE_PORT
172 # define EV_USE_PORT 0
173 #endif
174
175 #ifndef EV_USE_INOTIFY
176 # define EV_USE_INOTIFY 0
177 #endif
178
179 #ifndef EV_PID_HASHSIZE
180 # if EV_MINIMAL
181 # define EV_PID_HASHSIZE 1
182 # else
183 # define EV_PID_HASHSIZE 16
184 # endif
185 #endif
186
187 #ifndef EV_INOTIFY_HASHSIZE
188 # if EV_MINIMAL
189 # define EV_INOTIFY_HASHSIZE 1
190 # else
191 # define EV_INOTIFY_HASHSIZE 16
192 # endif
193 #endif
194
195 /**/
196
197 #ifndef CLOCK_MONOTONIC
198 # undef EV_USE_MONOTONIC
199 # define EV_USE_MONOTONIC 0
200 #endif
201
202 #ifndef CLOCK_REALTIME
203 # undef EV_USE_REALTIME
204 # define EV_USE_REALTIME 0
205 #endif
206
207 #if EV_SELECT_IS_WINSOCKET
208 # include <winsock.h>
209 #endif
210
211 #if !EV_STAT_ENABLE
212 # define EV_USE_INOTIFY 0
213 #endif
214
215 #if EV_USE_INOTIFY
216 # include <sys/inotify.h>
217 #endif
218
219 /**/
220
221 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
222 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
223 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
224
225 #if __GNUC__ >= 3
226 # define expect(expr,value) __builtin_expect ((expr),(value))
227 # define inline_size static inline /* inline for codesize */
228 # if EV_MINIMAL
229 # define noinline __attribute__ ((noinline))
230 # define inline_speed static noinline
231 # else
232 # define noinline
233 # define inline_speed static inline
234 # endif
235 #else
236 # define expect(expr,value) (expr)
237 # define inline_speed static
238 # define inline_size static
239 # define noinline
240 #endif
241
242 #define expect_false(expr) expect ((expr) != 0, 0)
243 #define expect_true(expr) expect ((expr) != 0, 1)
244
245 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
246 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
247
248 #define EMPTY /* required for microsofts broken pseudo-c compiler */
249 #define EMPTY2(a,b) /* used to suppress some warnings */
250
251 typedef ev_watcher *W;
252 typedef ev_watcher_list *WL;
253 typedef ev_watcher_time *WT;
254
255 static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
256
257 #ifdef _WIN32
258 # include "ev_win32.c"
259 #endif
260
261 /*****************************************************************************/
262
263 static void (*syserr_cb)(const char *msg);
264
265 void
266 ev_set_syserr_cb (void (*cb)(const char *msg))
267 {
268 syserr_cb = cb;
269 }
270
271 static void noinline
272 syserr (const char *msg)
273 {
274 if (!msg)
275 msg = "(libev) system error";
276
277 if (syserr_cb)
278 syserr_cb (msg);
279 else
280 {
281 perror (msg);
282 abort ();
283 }
284 }
285
286 static void *(*alloc)(void *ptr, long size);
287
288 void
289 ev_set_allocator (void *(*cb)(void *ptr, long size))
290 {
291 alloc = cb;
292 }
293
294 inline_speed void *
295 ev_realloc (void *ptr, long size)
296 {
297 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
298
299 if (!ptr && size)
300 {
301 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
302 abort ();
303 }
304
305 return ptr;
306 }
307
308 #define ev_malloc(size) ev_realloc (0, (size))
309 #define ev_free(ptr) ev_realloc ((ptr), 0)
310
311 /*****************************************************************************/
312
313 typedef struct
314 {
315 WL head;
316 unsigned char events;
317 unsigned char reify;
318 #if EV_SELECT_IS_WINSOCKET
319 SOCKET handle;
320 #endif
321 } ANFD;
322
323 typedef struct
324 {
325 W w;
326 int events;
327 } ANPENDING;
328
329 #if EV_USE_INOTIFY
330 typedef struct
331 {
332 WL head;
333 } ANFS;
334 #endif
335
336 #if EV_MULTIPLICITY
337
338 struct ev_loop
339 {
340 ev_tstamp ev_rt_now;
341 #define ev_rt_now ((loop)->ev_rt_now)
342 #define VAR(name,decl) decl;
343 #include "ev_vars.h"
344 #undef VAR
345 };
346 #include "ev_wrap.h"
347
348 static struct ev_loop default_loop_struct;
349 struct ev_loop *ev_default_loop_ptr;
350
351 #else
352
353 ev_tstamp ev_rt_now;
354 #define VAR(name,decl) static decl;
355 #include "ev_vars.h"
356 #undef VAR
357
358 static int ev_default_loop_ptr;
359
360 #endif
361
362 /*****************************************************************************/
363
364 ev_tstamp
365 ev_time (void)
366 {
367 #if EV_USE_REALTIME
368 struct timespec ts;
369 clock_gettime (CLOCK_REALTIME, &ts);
370 return ts.tv_sec + ts.tv_nsec * 1e-9;
371 #else
372 struct timeval tv;
373 gettimeofday (&tv, 0);
374 return tv.tv_sec + tv.tv_usec * 1e-6;
375 #endif
376 }
377
378 ev_tstamp inline_size
379 get_clock (void)
380 {
381 #if EV_USE_MONOTONIC
382 if (expect_true (have_monotonic))
383 {
384 struct timespec ts;
385 clock_gettime (CLOCK_MONOTONIC, &ts);
386 return ts.tv_sec + ts.tv_nsec * 1e-9;
387 }
388 #endif
389
390 return ev_time ();
391 }
392
393 #if EV_MULTIPLICITY
394 ev_tstamp
395 ev_now (EV_P)
396 {
397 return ev_rt_now;
398 }
399 #endif
400
401 int inline_size
402 array_nextsize (int elem, int cur, int cnt)
403 {
404 int ncur = cur + 1;
405
406 do
407 ncur <<= 1;
408 while (cnt > ncur);
409
410 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
411 if (elem * ncur > 4096)
412 {
413 ncur *= elem;
414 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
415 ncur = ncur - sizeof (void *) * 4;
416 ncur /= elem;
417 }
418
419 return ncur;
420 }
421
422 inline_speed void *
423 array_realloc (int elem, void *base, int *cur, int cnt)
424 {
425 *cur = array_nextsize (elem, *cur, cnt);
426 return ev_realloc (base, elem * *cur);
427 }
428
429 #define array_needsize(type,base,cur,cnt,init) \
430 if (expect_false ((cnt) > (cur))) \
431 { \
432 int ocur_ = (cur); \
433 (base) = (type *)array_realloc \
434 (sizeof (type), (base), &(cur), (cnt)); \
435 init ((base) + (ocur_), (cur) - ocur_); \
436 }
437
438 #if 0
439 #define array_slim(type,stem) \
440 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
441 { \
442 stem ## max = array_roundsize (stem ## cnt >> 1); \
443 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
444 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
445 }
446 #endif
447
448 #define array_free(stem, idx) \
449 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
450
451 /*****************************************************************************/
452
453 void noinline
454 ev_feed_event (EV_P_ void *w, int revents)
455 {
456 W w_ = (W)w;
457
458 if (expect_false (w_->pending))
459 {
460 pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
461 return;
462 }
463
464 w_->pending = ++pendingcnt [ABSPRI (w_)];
465 array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
466 pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
467 pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
468 }
469
470 void inline_size
471 queue_events (EV_P_ W *events, int eventcnt, int type)
472 {
473 int i;
474
475 for (i = 0; i < eventcnt; ++i)
476 ev_feed_event (EV_A_ events [i], type);
477 }
478
479 /*****************************************************************************/
480
481 void inline_size
482 anfds_init (ANFD *base, int count)
483 {
484 while (count--)
485 {
486 base->head = 0;
487 base->events = EV_NONE;
488 base->reify = 0;
489
490 ++base;
491 }
492 }
493
494 void inline_speed
495 fd_event (EV_P_ int fd, int revents)
496 {
497 ANFD *anfd = anfds + fd;
498 ev_io *w;
499
500 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
501 {
502 int ev = w->events & revents;
503
504 if (ev)
505 ev_feed_event (EV_A_ (W)w, ev);
506 }
507 }
508
509 void
510 ev_feed_fd_event (EV_P_ int fd, int revents)
511 {
512 if (fd >= 0 && fd < anfdmax)
513 fd_event (EV_A_ fd, revents);
514 }
515
516 void inline_size
517 fd_reify (EV_P)
518 {
519 int i;
520
521 for (i = 0; i < fdchangecnt; ++i)
522 {
523 int fd = fdchanges [i];
524 ANFD *anfd = anfds + fd;
525 ev_io *w;
526
527 int events = 0;
528
529 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
530 events |= w->events;
531
532 #if EV_SELECT_IS_WINSOCKET
533 if (events)
534 {
535 unsigned long argp;
536 anfd->handle = _get_osfhandle (fd);
537 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
538 }
539 #endif
540
541 anfd->reify = 0;
542
543 backend_modify (EV_A_ fd, anfd->events, events);
544 anfd->events = events;
545 }
546
547 fdchangecnt = 0;
548 }
549
550 void inline_size
551 fd_change (EV_P_ int fd)
552 {
553 if (expect_false (anfds [fd].reify))
554 return;
555
556 anfds [fd].reify = 1;
557
558 ++fdchangecnt;
559 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
560 fdchanges [fdchangecnt - 1] = fd;
561 }
562
563 void inline_speed
564 fd_kill (EV_P_ int fd)
565 {
566 ev_io *w;
567
568 while ((w = (ev_io *)anfds [fd].head))
569 {
570 ev_io_stop (EV_A_ w);
571 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
572 }
573 }
574
575 int inline_size
576 fd_valid (int fd)
577 {
578 #ifdef _WIN32
579 return _get_osfhandle (fd) != -1;
580 #else
581 return fcntl (fd, F_GETFD) != -1;
582 #endif
583 }
584
585 /* called on EBADF to verify fds */
586 static void noinline
587 fd_ebadf (EV_P)
588 {
589 int fd;
590
591 for (fd = 0; fd < anfdmax; ++fd)
592 if (anfds [fd].events)
593 if (!fd_valid (fd) == -1 && errno == EBADF)
594 fd_kill (EV_A_ fd);
595 }
596
597 /* called on ENOMEM in select/poll to kill some fds and retry */
598 static void noinline
599 fd_enomem (EV_P)
600 {
601 int fd;
602
603 for (fd = anfdmax; fd--; )
604 if (anfds [fd].events)
605 {
606 fd_kill (EV_A_ fd);
607 return;
608 }
609 }
610
611 /* usually called after fork if backend needs to re-arm all fds from scratch */
612 static void noinline
613 fd_rearm_all (EV_P)
614 {
615 int fd;
616
617 for (fd = 0; fd < anfdmax; ++fd)
618 if (anfds [fd].events)
619 {
620 anfds [fd].events = 0;
621 fd_change (EV_A_ fd);
622 }
623 }
624
625 /*****************************************************************************/
626
627 void inline_speed
628 upheap (WT *heap, int k)
629 {
630 WT w = heap [k];
631
632 while (k && heap [k >> 1]->at > w->at)
633 {
634 heap [k] = heap [k >> 1];
635 ((W)heap [k])->active = k + 1;
636 k >>= 1;
637 }
638
639 heap [k] = w;
640 ((W)heap [k])->active = k + 1;
641
642 }
643
644 void inline_speed
645 downheap (WT *heap, int N, int k)
646 {
647 WT w = heap [k];
648
649 while (k < (N >> 1))
650 {
651 int j = k << 1;
652
653 if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
654 ++j;
655
656 if (w->at <= heap [j]->at)
657 break;
658
659 heap [k] = heap [j];
660 ((W)heap [k])->active = k + 1;
661 k = j;
662 }
663
664 heap [k] = w;
665 ((W)heap [k])->active = k + 1;
666 }
667
668 void inline_size
669 adjustheap (WT *heap, int N, int k)
670 {
671 upheap (heap, k);
672 downheap (heap, N, k);
673 }
674
675 /*****************************************************************************/
676
677 typedef struct
678 {
679 WL head;
680 sig_atomic_t volatile gotsig;
681 } ANSIG;
682
683 static ANSIG *signals;
684 static int signalmax;
685
686 static int sigpipe [2];
687 static sig_atomic_t volatile gotsig;
688 static ev_io sigev;
689
690 void inline_size
691 signals_init (ANSIG *base, int count)
692 {
693 while (count--)
694 {
695 base->head = 0;
696 base->gotsig = 0;
697
698 ++base;
699 }
700 }
701
702 static void
703 sighandler (int signum)
704 {
705 #if _WIN32
706 signal (signum, sighandler);
707 #endif
708
709 signals [signum - 1].gotsig = 1;
710
711 if (!gotsig)
712 {
713 int old_errno = errno;
714 gotsig = 1;
715 write (sigpipe [1], &signum, 1);
716 errno = old_errno;
717 }
718 }
719
720 void noinline
721 ev_feed_signal_event (EV_P_ int signum)
722 {
723 WL w;
724
725 #if EV_MULTIPLICITY
726 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
727 #endif
728
729 --signum;
730
731 if (signum < 0 || signum >= signalmax)
732 return;
733
734 signals [signum].gotsig = 0;
735
736 for (w = signals [signum].head; w; w = w->next)
737 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
738 }
739
740 static void
741 sigcb (EV_P_ ev_io *iow, int revents)
742 {
743 int signum;
744
745 read (sigpipe [0], &revents, 1);
746 gotsig = 0;
747
748 for (signum = signalmax; signum--; )
749 if (signals [signum].gotsig)
750 ev_feed_signal_event (EV_A_ signum + 1);
751 }
752
753 void inline_size
754 fd_intern (int fd)
755 {
756 #ifdef _WIN32
757 int arg = 1;
758 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
759 #else
760 fcntl (fd, F_SETFD, FD_CLOEXEC);
761 fcntl (fd, F_SETFL, O_NONBLOCK);
762 #endif
763 }
764
765 static void noinline
766 siginit (EV_P)
767 {
768 fd_intern (sigpipe [0]);
769 fd_intern (sigpipe [1]);
770
771 ev_io_set (&sigev, sigpipe [0], EV_READ);
772 ev_io_start (EV_A_ &sigev);
773 ev_unref (EV_A); /* child watcher should not keep loop alive */
774 }
775
776 /*****************************************************************************/
777
778 static ev_child *childs [EV_PID_HASHSIZE];
779
780 #ifndef _WIN32
781
782 static ev_signal childev;
783
784 void inline_speed
785 child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
786 {
787 ev_child *w;
788
789 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
790 if (w->pid == pid || !w->pid)
791 {
792 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
793 w->rpid = pid;
794 w->rstatus = status;
795 ev_feed_event (EV_A_ (W)w, EV_CHILD);
796 }
797 }
798
799 #ifndef WCONTINUED
800 # define WCONTINUED 0
801 #endif
802
803 static void
804 childcb (EV_P_ ev_signal *sw, int revents)
805 {
806 int pid, status;
807
808 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
809 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
810 if (!WCONTINUED
811 || errno != EINVAL
812 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
813 return;
814
815 /* make sure we are called again until all childs have been reaped */
816 /* we need to do it this way so that the callback gets called before we continue */
817 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
818
819 child_reap (EV_A_ sw, pid, pid, status);
820 if (EV_PID_HASHSIZE > 1)
821 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
822 }
823
824 #endif
825
826 /*****************************************************************************/
827
828 #if EV_USE_PORT
829 # include "ev_port.c"
830 #endif
831 #if EV_USE_KQUEUE
832 # include "ev_kqueue.c"
833 #endif
834 #if EV_USE_EPOLL
835 # include "ev_epoll.c"
836 #endif
837 #if EV_USE_POLL
838 # include "ev_poll.c"
839 #endif
840 #if EV_USE_SELECT
841 # include "ev_select.c"
842 #endif
843
844 int
845 ev_version_major (void)
846 {
847 return EV_VERSION_MAJOR;
848 }
849
850 int
851 ev_version_minor (void)
852 {
853 return EV_VERSION_MINOR;
854 }
855
856 /* return true if we are running with elevated privileges and should ignore env variables */
857 int inline_size
858 enable_secure (void)
859 {
860 #ifdef _WIN32
861 return 0;
862 #else
863 return getuid () != geteuid ()
864 || getgid () != getegid ();
865 #endif
866 }
867
868 unsigned int
869 ev_supported_backends (void)
870 {
871 unsigned int flags = 0;
872
873 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
874 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
875 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
876 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
877 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
878
879 return flags;
880 }
881
882 unsigned int
883 ev_recommended_backends (void)
884 {
885 unsigned int flags = ev_supported_backends ();
886
887 #ifndef __NetBSD__
888 /* kqueue is borked on everything but netbsd apparently */
889 /* it usually doesn't work correctly on anything but sockets and pipes */
890 flags &= ~EVBACKEND_KQUEUE;
891 #endif
892 #ifdef __APPLE__
893 // flags &= ~EVBACKEND_KQUEUE; for documentation
894 flags &= ~EVBACKEND_POLL;
895 #endif
896
897 return flags;
898 }
899
900 unsigned int
901 ev_embeddable_backends (void)
902 {
903 return EVBACKEND_EPOLL
904 | EVBACKEND_KQUEUE
905 | EVBACKEND_PORT;
906 }
907
908 unsigned int
909 ev_backend (EV_P)
910 {
911 return backend;
912 }
913
914 unsigned int
915 ev_loop_count (EV_P)
916 {
917 return loop_count;
918 }
919
920 static void noinline
921 loop_init (EV_P_ unsigned int flags)
922 {
923 if (!backend)
924 {
925 #if EV_USE_MONOTONIC
926 {
927 struct timespec ts;
928 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
929 have_monotonic = 1;
930 }
931 #endif
932
933 ev_rt_now = ev_time ();
934 mn_now = get_clock ();
935 now_floor = mn_now;
936 rtmn_diff = ev_rt_now - mn_now;
937
938 /* pid check not overridable via env */
939 #ifndef _WIN32
940 if (flags & EVFLAG_FORKCHECK)
941 curpid = getpid ();
942 #endif
943
944 if (!(flags & EVFLAG_NOENV)
945 && !enable_secure ()
946 && getenv ("LIBEV_FLAGS"))
947 flags = atoi (getenv ("LIBEV_FLAGS"));
948
949 if (!(flags & 0x0000ffffUL))
950 flags |= ev_recommended_backends ();
951
952 backend = 0;
953 backend_fd = -1;
954 #if EV_USE_INOTIFY
955 fs_fd = -2;
956 #endif
957
958 #if EV_USE_PORT
959 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
960 #endif
961 #if EV_USE_KQUEUE
962 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
963 #endif
964 #if EV_USE_EPOLL
965 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
966 #endif
967 #if EV_USE_POLL
968 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
969 #endif
970 #if EV_USE_SELECT
971 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
972 #endif
973
974 ev_init (&sigev, sigcb);
975 ev_set_priority (&sigev, EV_MAXPRI);
976 }
977 }
978
979 static void noinline
980 loop_destroy (EV_P)
981 {
982 int i;
983
984 #if EV_USE_INOTIFY
985 if (fs_fd >= 0)
986 close (fs_fd);
987 #endif
988
989 if (backend_fd >= 0)
990 close (backend_fd);
991
992 #if EV_USE_PORT
993 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
994 #endif
995 #if EV_USE_KQUEUE
996 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
997 #endif
998 #if EV_USE_EPOLL
999 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1000 #endif
1001 #if EV_USE_POLL
1002 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1003 #endif
1004 #if EV_USE_SELECT
1005 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1006 #endif
1007
1008 for (i = NUMPRI; i--; )
1009 {
1010 array_free (pending, [i]);
1011 #if EV_IDLE_ENABLE
1012 array_free (idle, [i]);
1013 #endif
1014 }
1015
1016 /* have to use the microsoft-never-gets-it-right macro */
1017 array_free (fdchange, EMPTY);
1018 array_free (timer, EMPTY);
1019 #if EV_PERIODIC_ENABLE
1020 array_free (periodic, EMPTY);
1021 #endif
1022 array_free (prepare, EMPTY);
1023 array_free (check, EMPTY);
1024
1025 backend = 0;
1026 }
1027
1028 void inline_size infy_fork (EV_P);
1029
1030 void inline_size
1031 loop_fork (EV_P)
1032 {
1033 #if EV_USE_PORT
1034 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1035 #endif
1036 #if EV_USE_KQUEUE
1037 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1038 #endif
1039 #if EV_USE_EPOLL
1040 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1041 #endif
1042 #if EV_USE_INOTIFY
1043 infy_fork (EV_A);
1044 #endif
1045
1046 if (ev_is_active (&sigev))
1047 {
1048 /* default loop */
1049
1050 ev_ref (EV_A);
1051 ev_io_stop (EV_A_ &sigev);
1052 close (sigpipe [0]);
1053 close (sigpipe [1]);
1054
1055 while (pipe (sigpipe))
1056 syserr ("(libev) error creating pipe");
1057
1058 siginit (EV_A);
1059 }
1060
1061 postfork = 0;
1062 }
1063
1064 #if EV_MULTIPLICITY
1065 struct ev_loop *
1066 ev_loop_new (unsigned int flags)
1067 {
1068 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1069
1070 memset (loop, 0, sizeof (struct ev_loop));
1071
1072 loop_init (EV_A_ flags);
1073
1074 if (ev_backend (EV_A))
1075 return loop;
1076
1077 return 0;
1078 }
1079
1080 void
1081 ev_loop_destroy (EV_P)
1082 {
1083 loop_destroy (EV_A);
1084 ev_free (loop);
1085 }
1086
1087 void
1088 ev_loop_fork (EV_P)
1089 {
1090 postfork = 1;
1091 }
1092
1093 #endif
1094
1095 #if EV_MULTIPLICITY
1096 struct ev_loop *
1097 ev_default_loop_init (unsigned int flags)
1098 #else
1099 int
1100 ev_default_loop (unsigned int flags)
1101 #endif
1102 {
1103 if (sigpipe [0] == sigpipe [1])
1104 if (pipe (sigpipe))
1105 return 0;
1106
1107 if (!ev_default_loop_ptr)
1108 {
1109 #if EV_MULTIPLICITY
1110 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1111 #else
1112 ev_default_loop_ptr = 1;
1113 #endif
1114
1115 loop_init (EV_A_ flags);
1116
1117 if (ev_backend (EV_A))
1118 {
1119 siginit (EV_A);
1120
1121 #ifndef _WIN32
1122 ev_signal_init (&childev, childcb, SIGCHLD);
1123 ev_set_priority (&childev, EV_MAXPRI);
1124 ev_signal_start (EV_A_ &childev);
1125 ev_unref (EV_A); /* child watcher should not keep loop alive */
1126 #endif
1127 }
1128 else
1129 ev_default_loop_ptr = 0;
1130 }
1131
1132 return ev_default_loop_ptr;
1133 }
1134
1135 void
1136 ev_default_destroy (void)
1137 {
1138 #if EV_MULTIPLICITY
1139 struct ev_loop *loop = ev_default_loop_ptr;
1140 #endif
1141
1142 #ifndef _WIN32
1143 ev_ref (EV_A); /* child watcher */
1144 ev_signal_stop (EV_A_ &childev);
1145 #endif
1146
1147 ev_ref (EV_A); /* signal watcher */
1148 ev_io_stop (EV_A_ &sigev);
1149
1150 close (sigpipe [0]); sigpipe [0] = 0;
1151 close (sigpipe [1]); sigpipe [1] = 0;
1152
1153 loop_destroy (EV_A);
1154 }
1155
1156 void
1157 ev_default_fork (void)
1158 {
1159 #if EV_MULTIPLICITY
1160 struct ev_loop *loop = ev_default_loop_ptr;
1161 #endif
1162
1163 if (backend)
1164 postfork = 1;
1165 }
1166
1167 /*****************************************************************************/
1168
1169 void
1170 ev_invoke (EV_P_ void *w, int revents)
1171 {
1172 EV_CB_INVOKE ((W)w, revents);
1173 }
1174
1175 void inline_speed
1176 call_pending (EV_P)
1177 {
1178 int pri;
1179
1180 for (pri = NUMPRI; pri--; )
1181 while (pendingcnt [pri])
1182 {
1183 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1184
1185 if (expect_true (p->w))
1186 {
1187 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1188
1189 p->w->pending = 0;
1190 EV_CB_INVOKE (p->w, p->events);
1191 }
1192 }
1193 }
1194
1195 void inline_size
1196 timers_reify (EV_P)
1197 {
1198 while (timercnt && ((WT)timers [0])->at <= mn_now)
1199 {
1200 ev_timer *w = timers [0];
1201
1202 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1203
1204 /* first reschedule or stop timer */
1205 if (w->repeat)
1206 {
1207 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1208
1209 ((WT)w)->at += w->repeat;
1210 if (((WT)w)->at < mn_now)
1211 ((WT)w)->at = mn_now;
1212
1213 downheap ((WT *)timers, timercnt, 0);
1214 }
1215 else
1216 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1217
1218 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1219 }
1220 }
1221
1222 #if EV_PERIODIC_ENABLE
1223 void inline_size
1224 periodics_reify (EV_P)
1225 {
1226 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1227 {
1228 ev_periodic *w = periodics [0];
1229
1230 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1231
1232 /* first reschedule or stop timer */
1233 if (w->reschedule_cb)
1234 {
1235 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
1236 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1237 downheap ((WT *)periodics, periodiccnt, 0);
1238 }
1239 else if (w->interval)
1240 {
1241 ((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
1242 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1243 downheap ((WT *)periodics, periodiccnt, 0);
1244 }
1245 else
1246 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1247
1248 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1249 }
1250 }
1251
1252 static void noinline
1253 periodics_reschedule (EV_P)
1254 {
1255 int i;
1256
1257 /* adjust periodics after time jump */
1258 for (i = 0; i < periodiccnt; ++i)
1259 {
1260 ev_periodic *w = periodics [i];
1261
1262 if (w->reschedule_cb)
1263 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1264 else if (w->interval)
1265 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1266 }
1267
1268 /* now rebuild the heap */
1269 for (i = periodiccnt >> 1; i--; )
1270 downheap ((WT *)periodics, periodiccnt, i);
1271 }
1272 #endif
1273
1274 #if EV_IDLE_ENABLE
1275 void inline_size
1276 idle_reify (EV_P)
1277 {
1278 if (expect_false (idleall))
1279 {
1280 int pri;
1281
1282 for (pri = NUMPRI; pri--; )
1283 {
1284 if (pendingcnt [pri])
1285 break;
1286
1287 if (idlecnt [pri])
1288 {
1289 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1290 break;
1291 }
1292 }
1293 }
1294 }
1295 #endif
1296
1297 int inline_size
1298 time_update_monotonic (EV_P)
1299 {
1300 mn_now = get_clock ();
1301
1302 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1303 {
1304 ev_rt_now = rtmn_diff + mn_now;
1305 return 0;
1306 }
1307 else
1308 {
1309 now_floor = mn_now;
1310 ev_rt_now = ev_time ();
1311 return 1;
1312 }
1313 }
1314
1315 void inline_size
1316 time_update (EV_P)
1317 {
1318 int i;
1319
1320 #if EV_USE_MONOTONIC
1321 if (expect_true (have_monotonic))
1322 {
1323 if (time_update_monotonic (EV_A))
1324 {
1325 ev_tstamp odiff = rtmn_diff;
1326
1327 /* loop a few times, before making important decisions.
1328 * on the choice of "4": one iteration isn't enough,
1329 * in case we get preempted during the calls to
1330 * ev_time and get_clock. a second call is almost guaranteed
1331 * to succeed in that case, though. and looping a few more times
1332 * doesn't hurt either as we only do this on time-jumps or
1333 * in the unlikely event of having been preempted here.
1334 */
1335 for (i = 4; --i; )
1336 {
1337 rtmn_diff = ev_rt_now - mn_now;
1338
1339 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1340 return; /* all is well */
1341
1342 ev_rt_now = ev_time ();
1343 mn_now = get_clock ();
1344 now_floor = mn_now;
1345 }
1346
1347 # if EV_PERIODIC_ENABLE
1348 periodics_reschedule (EV_A);
1349 # endif
1350 /* no timer adjustment, as the monotonic clock doesn't jump */
1351 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1352 }
1353 }
1354 else
1355 #endif
1356 {
1357 ev_rt_now = ev_time ();
1358
1359 if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
1360 {
1361 #if EV_PERIODIC_ENABLE
1362 periodics_reschedule (EV_A);
1363 #endif
1364
1365 /* adjust timers. this is easy, as the offset is the same for all of them */
1366 for (i = 0; i < timercnt; ++i)
1367 ((WT)timers [i])->at += ev_rt_now - mn_now;
1368 }
1369
1370 mn_now = ev_rt_now;
1371 }
1372 }
1373
1374 void
1375 ev_ref (EV_P)
1376 {
1377 ++activecnt;
1378 }
1379
1380 void
1381 ev_unref (EV_P)
1382 {
1383 --activecnt;
1384 }
1385
1386 static int loop_done;
1387
1388 void
1389 ev_loop (EV_P_ int flags)
1390 {
1391 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1392 ? EVUNLOOP_ONE
1393 : EVUNLOOP_CANCEL;
1394
1395 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1396
1397 do
1398 {
1399 #ifndef _WIN32
1400 if (expect_false (curpid)) /* penalise the forking check even more */
1401 if (expect_false (getpid () != curpid))
1402 {
1403 curpid = getpid ();
1404 postfork = 1;
1405 }
1406 #endif
1407
1408 #if EV_FORK_ENABLE
1409 /* we might have forked, so queue fork handlers */
1410 if (expect_false (postfork))
1411 if (forkcnt)
1412 {
1413 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1414 call_pending (EV_A);
1415 }
1416 #endif
1417
1418 /* queue check watchers (and execute them) */
1419 if (expect_false (preparecnt))
1420 {
1421 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1422 call_pending (EV_A);
1423 }
1424
1425 if (expect_false (!activecnt))
1426 break;
1427
1428 /* we might have forked, so reify kernel state if necessary */
1429 if (expect_false (postfork))
1430 loop_fork (EV_A);
1431
1432 /* update fd-related kernel structures */
1433 fd_reify (EV_A);
1434
1435 /* calculate blocking time */
1436 {
1437 ev_tstamp block;
1438
1439 if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
1440 block = 0.; /* do not block at all */
1441 else
1442 {
1443 /* update time to cancel out callback processing overhead */
1444 #if EV_USE_MONOTONIC
1445 if (expect_true (have_monotonic))
1446 time_update_monotonic (EV_A);
1447 else
1448 #endif
1449 {
1450 ev_rt_now = ev_time ();
1451 mn_now = ev_rt_now;
1452 }
1453
1454 block = MAX_BLOCKTIME;
1455
1456 if (timercnt)
1457 {
1458 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1459 if (block > to) block = to;
1460 }
1461
1462 #if EV_PERIODIC_ENABLE
1463 if (periodiccnt)
1464 {
1465 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1466 if (block > to) block = to;
1467 }
1468 #endif
1469
1470 if (expect_false (block < 0.)) block = 0.;
1471 }
1472
1473 ++loop_count;
1474 backend_poll (EV_A_ block);
1475 }
1476
1477 /* update ev_rt_now, do magic */
1478 time_update (EV_A);
1479
1480 /* queue pending timers and reschedule them */
1481 timers_reify (EV_A); /* relative timers called last */
1482 #if EV_PERIODIC_ENABLE
1483 periodics_reify (EV_A); /* absolute timers called first */
1484 #endif
1485
1486 #if EV_IDLE_ENABLE
1487 /* queue idle watchers unless other events are pending */
1488 idle_reify (EV_A);
1489 #endif
1490
1491 /* queue check watchers, to be executed first */
1492 if (expect_false (checkcnt))
1493 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1494
1495 call_pending (EV_A);
1496
1497 }
1498 while (expect_true (activecnt && !loop_done));
1499
1500 if (loop_done == EVUNLOOP_ONE)
1501 loop_done = EVUNLOOP_CANCEL;
1502 }
1503
1504 void
1505 ev_unloop (EV_P_ int how)
1506 {
1507 loop_done = how;
1508 }
1509
1510 /*****************************************************************************/
1511
1512 void inline_size
1513 wlist_add (WL *head, WL elem)
1514 {
1515 elem->next = *head;
1516 *head = elem;
1517 }
1518
1519 void inline_size
1520 wlist_del (WL *head, WL elem)
1521 {
1522 while (*head)
1523 {
1524 if (*head == elem)
1525 {
1526 *head = elem->next;
1527 return;
1528 }
1529
1530 head = &(*head)->next;
1531 }
1532 }
1533
1534 void inline_speed
1535 clear_pending (EV_P_ W w)
1536 {
1537 if (w->pending)
1538 {
1539 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1540 w->pending = 0;
1541 }
1542 }
1543
1544 int
1545 ev_clear_pending (EV_P_ void *w)
1546 {
1547 W w_ = (W)w;
1548 int pending = w_->pending;
1549
1550 if (!pending)
1551 return 0;
1552
1553 w_->pending = 0;
1554 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1555 p->w = 0;
1556
1557 return p->events;
1558 }
1559
1560 void inline_size
1561 pri_adjust (EV_P_ W w)
1562 {
1563 int pri = w->priority;
1564 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1565 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1566 w->priority = pri;
1567 }
1568
1569 void inline_speed
1570 ev_start (EV_P_ W w, int active)
1571 {
1572 pri_adjust (EV_A_ w);
1573 w->active = active;
1574 ev_ref (EV_A);
1575 }
1576
1577 void inline_size
1578 ev_stop (EV_P_ W w)
1579 {
1580 ev_unref (EV_A);
1581 w->active = 0;
1582 }
1583
1584 /*****************************************************************************/
1585
1586 void
1587 ev_io_start (EV_P_ ev_io *w)
1588 {
1589 int fd = w->fd;
1590
1591 if (expect_false (ev_is_active (w)))
1592 return;
1593
1594 assert (("ev_io_start called with negative fd", fd >= 0));
1595
1596 ev_start (EV_A_ (W)w, 1);
1597 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1598 wlist_add ((WL *)&anfds[fd].head, (WL)w);
1599
1600 fd_change (EV_A_ fd);
1601 }
1602
1603 void
1604 ev_io_stop (EV_P_ ev_io *w)
1605 {
1606 clear_pending (EV_A_ (W)w);
1607 if (expect_false (!ev_is_active (w)))
1608 return;
1609
1610 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1611
1612 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
1613 ev_stop (EV_A_ (W)w);
1614
1615 fd_change (EV_A_ w->fd);
1616 }
1617
1618 void
1619 ev_timer_start (EV_P_ ev_timer *w)
1620 {
1621 if (expect_false (ev_is_active (w)))
1622 return;
1623
1624 ((WT)w)->at += mn_now;
1625
1626 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1627
1628 ev_start (EV_A_ (W)w, ++timercnt);
1629 array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
1630 timers [timercnt - 1] = w;
1631 upheap ((WT *)timers, timercnt - 1);
1632
1633 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1634 }
1635
1636 void
1637 ev_timer_stop (EV_P_ ev_timer *w)
1638 {
1639 clear_pending (EV_A_ (W)w);
1640 if (expect_false (!ev_is_active (w)))
1641 return;
1642
1643 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1644
1645 {
1646 int active = ((W)w)->active;
1647
1648 if (expect_true (--active < --timercnt))
1649 {
1650 timers [active] = timers [timercnt];
1651 adjustheap ((WT *)timers, timercnt, active);
1652 }
1653 }
1654
1655 ((WT)w)->at -= mn_now;
1656
1657 ev_stop (EV_A_ (W)w);
1658 }
1659
1660 void
1661 ev_timer_again (EV_P_ ev_timer *w)
1662 {
1663 if (ev_is_active (w))
1664 {
1665 if (w->repeat)
1666 {
1667 ((WT)w)->at = mn_now + w->repeat;
1668 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1669 }
1670 else
1671 ev_timer_stop (EV_A_ w);
1672 }
1673 else if (w->repeat)
1674 {
1675 w->at = w->repeat;
1676 ev_timer_start (EV_A_ w);
1677 }
1678 }
1679
1680 #if EV_PERIODIC_ENABLE
1681 void
1682 ev_periodic_start (EV_P_ ev_periodic *w)
1683 {
1684 if (expect_false (ev_is_active (w)))
1685 return;
1686
1687 if (w->reschedule_cb)
1688 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1689 else if (w->interval)
1690 {
1691 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1692 /* this formula differs from the one in periodic_reify because we do not always round up */
1693 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1694 }
1695
1696 ev_start (EV_A_ (W)w, ++periodiccnt);
1697 array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
1698 periodics [periodiccnt - 1] = w;
1699 upheap ((WT *)periodics, periodiccnt - 1);
1700
1701 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1702 }
1703
1704 void
1705 ev_periodic_stop (EV_P_ ev_periodic *w)
1706 {
1707 clear_pending (EV_A_ (W)w);
1708 if (expect_false (!ev_is_active (w)))
1709 return;
1710
1711 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1712
1713 {
1714 int active = ((W)w)->active;
1715
1716 if (expect_true (--active < --periodiccnt))
1717 {
1718 periodics [active] = periodics [periodiccnt];
1719 adjustheap ((WT *)periodics, periodiccnt, active);
1720 }
1721 }
1722
1723 ev_stop (EV_A_ (W)w);
1724 }
1725
1726 void
1727 ev_periodic_again (EV_P_ ev_periodic *w)
1728 {
1729 /* TODO: use adjustheap and recalculation */
1730 ev_periodic_stop (EV_A_ w);
1731 ev_periodic_start (EV_A_ w);
1732 }
1733 #endif
1734
1735 #ifndef SA_RESTART
1736 # define SA_RESTART 0
1737 #endif
1738
1739 void
1740 ev_signal_start (EV_P_ ev_signal *w)
1741 {
1742 #if EV_MULTIPLICITY
1743 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1744 #endif
1745 if (expect_false (ev_is_active (w)))
1746 return;
1747
1748 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1749
1750 ev_start (EV_A_ (W)w, 1);
1751 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1752 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
1753
1754 if (!((WL)w)->next)
1755 {
1756 #if _WIN32
1757 signal (w->signum, sighandler);
1758 #else
1759 struct sigaction sa;
1760 sa.sa_handler = sighandler;
1761 sigfillset (&sa.sa_mask);
1762 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1763 sigaction (w->signum, &sa, 0);
1764 #endif
1765 }
1766 }
1767
1768 void
1769 ev_signal_stop (EV_P_ ev_signal *w)
1770 {
1771 clear_pending (EV_A_ (W)w);
1772 if (expect_false (!ev_is_active (w)))
1773 return;
1774
1775 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1776 ev_stop (EV_A_ (W)w);
1777
1778 if (!signals [w->signum - 1].head)
1779 signal (w->signum, SIG_DFL);
1780 }
1781
1782 void
1783 ev_child_start (EV_P_ ev_child *w)
1784 {
1785 #if EV_MULTIPLICITY
1786 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1787 #endif
1788 if (expect_false (ev_is_active (w)))
1789 return;
1790
1791 ev_start (EV_A_ (W)w, 1);
1792 wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1793 }
1794
1795 void
1796 ev_child_stop (EV_P_ ev_child *w)
1797 {
1798 clear_pending (EV_A_ (W)w);
1799 if (expect_false (!ev_is_active (w)))
1800 return;
1801
1802 wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1803 ev_stop (EV_A_ (W)w);
1804 }
1805
1806 #if EV_STAT_ENABLE
1807
1808 # ifdef _WIN32
1809 # undef lstat
1810 # define lstat(a,b) _stati64 (a,b)
1811 # endif
1812
1813 #define DEF_STAT_INTERVAL 5.0074891
1814 #define MIN_STAT_INTERVAL 0.1074891
1815
1816 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
1817
1818 #if EV_USE_INOTIFY
1819 # define EV_INOTIFY_BUFSIZE 8192
1820
1821 static void noinline
1822 infy_add (EV_P_ ev_stat *w)
1823 {
1824 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
1825
1826 if (w->wd < 0)
1827 {
1828 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
1829
1830 /* monitor some parent directory for speedup hints */
1831 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
1832 {
1833 char path [4096];
1834 strcpy (path, w->path);
1835
1836 do
1837 {
1838 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
1839 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
1840
1841 char *pend = strrchr (path, '/');
1842
1843 if (!pend)
1844 break; /* whoops, no '/', complain to your admin */
1845
1846 *pend = 0;
1847 w->wd = inotify_add_watch (fs_fd, path, mask);
1848 }
1849 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
1850 }
1851 }
1852 else
1853 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
1854
1855 if (w->wd >= 0)
1856 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
1857 }
1858
1859 static void noinline
1860 infy_del (EV_P_ ev_stat *w)
1861 {
1862 int slot;
1863 int wd = w->wd;
1864
1865 if (wd < 0)
1866 return;
1867
1868 w->wd = -2;
1869 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
1870 wlist_del (&fs_hash [slot].head, (WL)w);
1871
1872 /* remove this watcher, if others are watching it, they will rearm */
1873 inotify_rm_watch (fs_fd, wd);
1874 }
1875
1876 static void noinline
1877 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
1878 {
1879 if (slot < 0)
1880 /* overflow, need to check for all hahs slots */
1881 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1882 infy_wd (EV_A_ slot, wd, ev);
1883 else
1884 {
1885 WL w_;
1886
1887 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
1888 {
1889 ev_stat *w = (ev_stat *)w_;
1890 w_ = w_->next; /* lets us remove this watcher and all before it */
1891
1892 if (w->wd == wd || wd == -1)
1893 {
1894 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
1895 {
1896 w->wd = -1;
1897 infy_add (EV_A_ w); /* re-add, no matter what */
1898 }
1899
1900 stat_timer_cb (EV_A_ &w->timer, 0);
1901 }
1902 }
1903 }
1904 }
1905
1906 static void
1907 infy_cb (EV_P_ ev_io *w, int revents)
1908 {
1909 char buf [EV_INOTIFY_BUFSIZE];
1910 struct inotify_event *ev = (struct inotify_event *)buf;
1911 int ofs;
1912 int len = read (fs_fd, buf, sizeof (buf));
1913
1914 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
1915 infy_wd (EV_A_ ev->wd, ev->wd, ev);
1916 }
1917
1918 void inline_size
1919 infy_init (EV_P)
1920 {
1921 if (fs_fd != -2)
1922 return;
1923
1924 fs_fd = inotify_init ();
1925
1926 if (fs_fd >= 0)
1927 {
1928 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
1929 ev_set_priority (&fs_w, EV_MAXPRI);
1930 ev_io_start (EV_A_ &fs_w);
1931 }
1932 }
1933
1934 void inline_size
1935 infy_fork (EV_P)
1936 {
1937 int slot;
1938
1939 if (fs_fd < 0)
1940 return;
1941
1942 close (fs_fd);
1943 fs_fd = inotify_init ();
1944
1945 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1946 {
1947 WL w_ = fs_hash [slot].head;
1948 fs_hash [slot].head = 0;
1949
1950 while (w_)
1951 {
1952 ev_stat *w = (ev_stat *)w_;
1953 w_ = w_->next; /* lets us add this watcher */
1954
1955 w->wd = -1;
1956
1957 if (fs_fd >= 0)
1958 infy_add (EV_A_ w); /* re-add, no matter what */
1959 else
1960 ev_timer_start (EV_A_ &w->timer);
1961 }
1962
1963 }
1964 }
1965
1966 #endif
1967
1968 void
1969 ev_stat_stat (EV_P_ ev_stat *w)
1970 {
1971 if (lstat (w->path, &w->attr) < 0)
1972 w->attr.st_nlink = 0;
1973 else if (!w->attr.st_nlink)
1974 w->attr.st_nlink = 1;
1975 }
1976
1977 static void noinline
1978 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
1979 {
1980 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
1981
1982 /* we copy this here each the time so that */
1983 /* prev has the old value when the callback gets invoked */
1984 w->prev = w->attr;
1985 ev_stat_stat (EV_A_ w);
1986
1987 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
1988 if (
1989 w->prev.st_dev != w->attr.st_dev
1990 || w->prev.st_ino != w->attr.st_ino
1991 || w->prev.st_mode != w->attr.st_mode
1992 || w->prev.st_nlink != w->attr.st_nlink
1993 || w->prev.st_uid != w->attr.st_uid
1994 || w->prev.st_gid != w->attr.st_gid
1995 || w->prev.st_rdev != w->attr.st_rdev
1996 || w->prev.st_size != w->attr.st_size
1997 || w->prev.st_atime != w->attr.st_atime
1998 || w->prev.st_mtime != w->attr.st_mtime
1999 || w->prev.st_ctime != w->attr.st_ctime
2000 ) {
2001 #if EV_USE_INOTIFY
2002 infy_del (EV_A_ w);
2003 infy_add (EV_A_ w);
2004 ev_stat_stat (EV_A_ w); /* avoid race... */
2005 #endif
2006
2007 ev_feed_event (EV_A_ w, EV_STAT);
2008 }
2009 }
2010
2011 void
2012 ev_stat_start (EV_P_ ev_stat *w)
2013 {
2014 if (expect_false (ev_is_active (w)))
2015 return;
2016
2017 /* since we use memcmp, we need to clear any padding data etc. */
2018 memset (&w->prev, 0, sizeof (ev_statdata));
2019 memset (&w->attr, 0, sizeof (ev_statdata));
2020
2021 ev_stat_stat (EV_A_ w);
2022
2023 if (w->interval < MIN_STAT_INTERVAL)
2024 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2025
2026 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2027 ev_set_priority (&w->timer, ev_priority (w));
2028
2029 #if EV_USE_INOTIFY
2030 infy_init (EV_A);
2031
2032 if (fs_fd >= 0)
2033 infy_add (EV_A_ w);
2034 else
2035 #endif
2036 ev_timer_start (EV_A_ &w->timer);
2037
2038 ev_start (EV_A_ (W)w, 1);
2039 }
2040
2041 void
2042 ev_stat_stop (EV_P_ ev_stat *w)
2043 {
2044 clear_pending (EV_A_ (W)w);
2045 if (expect_false (!ev_is_active (w)))
2046 return;
2047
2048 #if EV_USE_INOTIFY
2049 infy_del (EV_A_ w);
2050 #endif
2051 ev_timer_stop (EV_A_ &w->timer);
2052
2053 ev_stop (EV_A_ (W)w);
2054 }
2055 #endif
2056
2057 #if EV_IDLE_ENABLE
2058 void
2059 ev_idle_start (EV_P_ ev_idle *w)
2060 {
2061 if (expect_false (ev_is_active (w)))
2062 return;
2063
2064 pri_adjust (EV_A_ (W)w);
2065
2066 {
2067 int active = ++idlecnt [ABSPRI (w)];
2068
2069 ++idleall;
2070 ev_start (EV_A_ (W)w, active);
2071
2072 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2073 idles [ABSPRI (w)][active - 1] = w;
2074 }
2075 }
2076
2077 void
2078 ev_idle_stop (EV_P_ ev_idle *w)
2079 {
2080 clear_pending (EV_A_ (W)w);
2081 if (expect_false (!ev_is_active (w)))
2082 return;
2083
2084 {
2085 int active = ((W)w)->active;
2086
2087 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2088 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2089
2090 ev_stop (EV_A_ (W)w);
2091 --idleall;
2092 }
2093 }
2094 #endif
2095
2096 void
2097 ev_prepare_start (EV_P_ ev_prepare *w)
2098 {
2099 if (expect_false (ev_is_active (w)))
2100 return;
2101
2102 ev_start (EV_A_ (W)w, ++preparecnt);
2103 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2104 prepares [preparecnt - 1] = w;
2105 }
2106
2107 void
2108 ev_prepare_stop (EV_P_ ev_prepare *w)
2109 {
2110 clear_pending (EV_A_ (W)w);
2111 if (expect_false (!ev_is_active (w)))
2112 return;
2113
2114 {
2115 int active = ((W)w)->active;
2116 prepares [active - 1] = prepares [--preparecnt];
2117 ((W)prepares [active - 1])->active = active;
2118 }
2119
2120 ev_stop (EV_A_ (W)w);
2121 }
2122
2123 void
2124 ev_check_start (EV_P_ ev_check *w)
2125 {
2126 if (expect_false (ev_is_active (w)))
2127 return;
2128
2129 ev_start (EV_A_ (W)w, ++checkcnt);
2130 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2131 checks [checkcnt - 1] = w;
2132 }
2133
2134 void
2135 ev_check_stop (EV_P_ ev_check *w)
2136 {
2137 clear_pending (EV_A_ (W)w);
2138 if (expect_false (!ev_is_active (w)))
2139 return;
2140
2141 {
2142 int active = ((W)w)->active;
2143 checks [active - 1] = checks [--checkcnt];
2144 ((W)checks [active - 1])->active = active;
2145 }
2146
2147 ev_stop (EV_A_ (W)w);
2148 }
2149
2150 #if EV_EMBED_ENABLE
2151 void noinline
2152 ev_embed_sweep (EV_P_ ev_embed *w)
2153 {
2154 ev_loop (w->loop, EVLOOP_NONBLOCK);
2155 }
2156
2157 static void
2158 embed_cb (EV_P_ ev_io *io, int revents)
2159 {
2160 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2161
2162 if (ev_cb (w))
2163 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2164 else
2165 ev_embed_sweep (loop, w);
2166 }
2167
2168 void
2169 ev_embed_start (EV_P_ ev_embed *w)
2170 {
2171 if (expect_false (ev_is_active (w)))
2172 return;
2173
2174 {
2175 struct ev_loop *loop = w->loop;
2176 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2177 ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
2178 }
2179
2180 ev_set_priority (&w->io, ev_priority (w));
2181 ev_io_start (EV_A_ &w->io);
2182
2183 ev_start (EV_A_ (W)w, 1);
2184 }
2185
2186 void
2187 ev_embed_stop (EV_P_ ev_embed *w)
2188 {
2189 clear_pending (EV_A_ (W)w);
2190 if (expect_false (!ev_is_active (w)))
2191 return;
2192
2193 ev_io_stop (EV_A_ &w->io);
2194
2195 ev_stop (EV_A_ (W)w);
2196 }
2197 #endif
2198
2199 #if EV_FORK_ENABLE
2200 void
2201 ev_fork_start (EV_P_ ev_fork *w)
2202 {
2203 if (expect_false (ev_is_active (w)))
2204 return;
2205
2206 ev_start (EV_A_ (W)w, ++forkcnt);
2207 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2208 forks [forkcnt - 1] = w;
2209 }
2210
2211 void
2212 ev_fork_stop (EV_P_ ev_fork *w)
2213 {
2214 clear_pending (EV_A_ (W)w);
2215 if (expect_false (!ev_is_active (w)))
2216 return;
2217
2218 {
2219 int active = ((W)w)->active;
2220 forks [active - 1] = forks [--forkcnt];
2221 ((W)forks [active - 1])->active = active;
2222 }
2223
2224 ev_stop (EV_A_ (W)w);
2225 }
2226 #endif
2227
2228 /*****************************************************************************/
2229
2230 struct ev_once
2231 {
2232 ev_io io;
2233 ev_timer to;
2234 void (*cb)(int revents, void *arg);
2235 void *arg;
2236 };
2237
2238 static void
2239 once_cb (EV_P_ struct ev_once *once, int revents)
2240 {
2241 void (*cb)(int revents, void *arg) = once->cb;
2242 void *arg = once->arg;
2243
2244 ev_io_stop (EV_A_ &once->io);
2245 ev_timer_stop (EV_A_ &once->to);
2246 ev_free (once);
2247
2248 cb (revents, arg);
2249 }
2250
2251 static void
2252 once_cb_io (EV_P_ ev_io *w, int revents)
2253 {
2254 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2255 }
2256
2257 static void
2258 once_cb_to (EV_P_ ev_timer *w, int revents)
2259 {
2260 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2261 }
2262
2263 void
2264 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2265 {
2266 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2267
2268 if (expect_false (!once))
2269 {
2270 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2271 return;
2272 }
2273
2274 once->cb = cb;
2275 once->arg = arg;
2276
2277 ev_init (&once->io, once_cb_io);
2278 if (fd >= 0)
2279 {
2280 ev_io_set (&once->io, fd, events);
2281 ev_io_start (EV_A_ &once->io);
2282 }
2283
2284 ev_init (&once->to, once_cb_to);
2285 if (timeout >= 0.)
2286 {
2287 ev_timer_set (&once->to, timeout, 0.);
2288 ev_timer_start (EV_A_ &once->to);
2289 }
2290 }
2291
2292 #ifdef __cplusplus
2293 }
2294 #endif
2295