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Revision: 1.176
Committed: Tue Dec 11 04:31:55 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.175: +14 -3 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 /*
222 * This is used to avoid floating point rounding problems.
223 * It is added to ev_rt_now when scheduling periodics
224 * to ensure progress, time-wise, even when rounding
225 * errors are against us.
226 * This value is good at least till the year 4000
227 * and intervals up to 20 years.
228 * Better solutions welcome.
229 */
230 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
231
232 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
233 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
234 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
235
236 #if __GNUC__ >= 3
237 # define expect(expr,value) __builtin_expect ((expr),(value))
238 # define noinline __attribute__ ((noinline))
239 #else
240 # define expect(expr,value) (expr)
241 # define noinline
242 # if __STDC_VERSION__ < 199901L
243 # define inline
244 # endif
245 #endif
246
247 #define expect_false(expr) expect ((expr) != 0, 0)
248 #define expect_true(expr) expect ((expr) != 0, 1)
249 #define inline_size static inline
250
251 #if EV_MINIMAL
252 # define inline_speed static noinline
253 #else
254 # define inline_speed static inline
255 #endif
256
257 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
258 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
259
260 #define EMPTY /* required for microsofts broken pseudo-c compiler */
261 #define EMPTY2(a,b) /* used to suppress some warnings */
262
263 typedef ev_watcher *W;
264 typedef ev_watcher_list *WL;
265 typedef ev_watcher_time *WT;
266
267 static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
268
269 #ifdef _WIN32
270 # include "ev_win32.c"
271 #endif
272
273 /*****************************************************************************/
274
275 static void (*syserr_cb)(const char *msg);
276
277 void
278 ev_set_syserr_cb (void (*cb)(const char *msg))
279 {
280 syserr_cb = cb;
281 }
282
283 static void noinline
284 syserr (const char *msg)
285 {
286 if (!msg)
287 msg = "(libev) system error";
288
289 if (syserr_cb)
290 syserr_cb (msg);
291 else
292 {
293 perror (msg);
294 abort ();
295 }
296 }
297
298 static void *(*alloc)(void *ptr, long size);
299
300 void
301 ev_set_allocator (void *(*cb)(void *ptr, long size))
302 {
303 alloc = cb;
304 }
305
306 inline_speed void *
307 ev_realloc (void *ptr, long size)
308 {
309 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
310
311 if (!ptr && size)
312 {
313 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
314 abort ();
315 }
316
317 return ptr;
318 }
319
320 #define ev_malloc(size) ev_realloc (0, (size))
321 #define ev_free(ptr) ev_realloc ((ptr), 0)
322
323 /*****************************************************************************/
324
325 typedef struct
326 {
327 WL head;
328 unsigned char events;
329 unsigned char reify;
330 #if EV_SELECT_IS_WINSOCKET
331 SOCKET handle;
332 #endif
333 } ANFD;
334
335 typedef struct
336 {
337 W w;
338 int events;
339 } ANPENDING;
340
341 #if EV_USE_INOTIFY
342 typedef struct
343 {
344 WL head;
345 } ANFS;
346 #endif
347
348 #if EV_MULTIPLICITY
349
350 struct ev_loop
351 {
352 ev_tstamp ev_rt_now;
353 #define ev_rt_now ((loop)->ev_rt_now)
354 #define VAR(name,decl) decl;
355 #include "ev_vars.h"
356 #undef VAR
357 };
358 #include "ev_wrap.h"
359
360 static struct ev_loop default_loop_struct;
361 struct ev_loop *ev_default_loop_ptr;
362
363 #else
364
365 ev_tstamp ev_rt_now;
366 #define VAR(name,decl) static decl;
367 #include "ev_vars.h"
368 #undef VAR
369
370 static int ev_default_loop_ptr;
371
372 #endif
373
374 /*****************************************************************************/
375
376 ev_tstamp
377 ev_time (void)
378 {
379 #if EV_USE_REALTIME
380 struct timespec ts;
381 clock_gettime (CLOCK_REALTIME, &ts);
382 return ts.tv_sec + ts.tv_nsec * 1e-9;
383 #else
384 struct timeval tv;
385 gettimeofday (&tv, 0);
386 return tv.tv_sec + tv.tv_usec * 1e-6;
387 #endif
388 }
389
390 ev_tstamp inline_size
391 get_clock (void)
392 {
393 #if EV_USE_MONOTONIC
394 if (expect_true (have_monotonic))
395 {
396 struct timespec ts;
397 clock_gettime (CLOCK_MONOTONIC, &ts);
398 return ts.tv_sec + ts.tv_nsec * 1e-9;
399 }
400 #endif
401
402 return ev_time ();
403 }
404
405 #if EV_MULTIPLICITY
406 ev_tstamp
407 ev_now (EV_P)
408 {
409 return ev_rt_now;
410 }
411 #endif
412
413 int inline_size
414 array_nextsize (int elem, int cur, int cnt)
415 {
416 int ncur = cur + 1;
417
418 do
419 ncur <<= 1;
420 while (cnt > ncur);
421
422 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
423 if (elem * ncur > 4096)
424 {
425 ncur *= elem;
426 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
427 ncur = ncur - sizeof (void *) * 4;
428 ncur /= elem;
429 }
430
431 return ncur;
432 }
433
434 static noinline void *
435 array_realloc (int elem, void *base, int *cur, int cnt)
436 {
437 *cur = array_nextsize (elem, *cur, cnt);
438 return ev_realloc (base, elem * *cur);
439 }
440
441 #define array_needsize(type,base,cur,cnt,init) \
442 if (expect_false ((cnt) > (cur))) \
443 { \
444 int ocur_ = (cur); \
445 (base) = (type *)array_realloc \
446 (sizeof (type), (base), &(cur), (cnt)); \
447 init ((base) + (ocur_), (cur) - ocur_); \
448 }
449
450 #if 0
451 #define array_slim(type,stem) \
452 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
453 { \
454 stem ## max = array_roundsize (stem ## cnt >> 1); \
455 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
456 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
457 }
458 #endif
459
460 #define array_free(stem, idx) \
461 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
462
463 /*****************************************************************************/
464
465 void noinline
466 ev_feed_event (EV_P_ void *w, int revents)
467 {
468 W w_ = (W)w;
469 int pri = ABSPRI (w_);
470
471 if (expect_false (w_->pending))
472 pendings [pri][w_->pending - 1].events |= revents;
473 else
474 {
475 w_->pending = ++pendingcnt [pri];
476 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
477 pendings [pri][w_->pending - 1].w = w_;
478 pendings [pri][w_->pending - 1].events = revents;
479 }
480 }
481
482 void inline_size
483 queue_events (EV_P_ W *events, int eventcnt, int type)
484 {
485 int i;
486
487 for (i = 0; i < eventcnt; ++i)
488 ev_feed_event (EV_A_ events [i], type);
489 }
490
491 /*****************************************************************************/
492
493 void inline_size
494 anfds_init (ANFD *base, int count)
495 {
496 while (count--)
497 {
498 base->head = 0;
499 base->events = EV_NONE;
500 base->reify = 0;
501
502 ++base;
503 }
504 }
505
506 void inline_speed
507 fd_event (EV_P_ int fd, int revents)
508 {
509 ANFD *anfd = anfds + fd;
510 ev_io *w;
511
512 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
513 {
514 int ev = w->events & revents;
515
516 if (ev)
517 ev_feed_event (EV_A_ (W)w, ev);
518 }
519 }
520
521 void
522 ev_feed_fd_event (EV_P_ int fd, int revents)
523 {
524 if (fd >= 0 && fd < anfdmax)
525 fd_event (EV_A_ fd, revents);
526 }
527
528 void inline_size
529 fd_reify (EV_P)
530 {
531 int i;
532
533 for (i = 0; i < fdchangecnt; ++i)
534 {
535 int fd = fdchanges [i];
536 ANFD *anfd = anfds + fd;
537 ev_io *w;
538
539 int events = 0;
540
541 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
542 events |= w->events;
543
544 #if EV_SELECT_IS_WINSOCKET
545 if (events)
546 {
547 unsigned long argp;
548 anfd->handle = _get_osfhandle (fd);
549 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
550 }
551 #endif
552
553 anfd->reify = 0;
554
555 backend_modify (EV_A_ fd, anfd->events, events);
556 anfd->events = events;
557 }
558
559 fdchangecnt = 0;
560 }
561
562 void inline_size
563 fd_change (EV_P_ int fd)
564 {
565 if (expect_false (anfds [fd].reify))
566 return;
567
568 anfds [fd].reify = 1;
569
570 ++fdchangecnt;
571 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
572 fdchanges [fdchangecnt - 1] = fd;
573 }
574
575 void inline_speed
576 fd_kill (EV_P_ int fd)
577 {
578 ev_io *w;
579
580 while ((w = (ev_io *)anfds [fd].head))
581 {
582 ev_io_stop (EV_A_ w);
583 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
584 }
585 }
586
587 int inline_size
588 fd_valid (int fd)
589 {
590 #ifdef _WIN32
591 return _get_osfhandle (fd) != -1;
592 #else
593 return fcntl (fd, F_GETFD) != -1;
594 #endif
595 }
596
597 /* called on EBADF to verify fds */
598 static void noinline
599 fd_ebadf (EV_P)
600 {
601 int fd;
602
603 for (fd = 0; fd < anfdmax; ++fd)
604 if (anfds [fd].events)
605 if (!fd_valid (fd) == -1 && errno == EBADF)
606 fd_kill (EV_A_ fd);
607 }
608
609 /* called on ENOMEM in select/poll to kill some fds and retry */
610 static void noinline
611 fd_enomem (EV_P)
612 {
613 int fd;
614
615 for (fd = anfdmax; fd--; )
616 if (anfds [fd].events)
617 {
618 fd_kill (EV_A_ fd);
619 return;
620 }
621 }
622
623 /* usually called after fork if backend needs to re-arm all fds from scratch */
624 static void noinline
625 fd_rearm_all (EV_P)
626 {
627 int fd;
628
629 for (fd = 0; fd < anfdmax; ++fd)
630 if (anfds [fd].events)
631 {
632 anfds [fd].events = 0;
633 fd_change (EV_A_ fd);
634 }
635 }
636
637 /*****************************************************************************/
638
639 void inline_speed
640 upheap (WT *heap, int k)
641 {
642 WT w = heap [k];
643
644 while (k && heap [k >> 1]->at > w->at)
645 {
646 heap [k] = heap [k >> 1];
647 ((W)heap [k])->active = k + 1;
648 k >>= 1;
649 }
650
651 heap [k] = w;
652 ((W)heap [k])->active = k + 1;
653
654 }
655
656 void inline_speed
657 downheap (WT *heap, int N, int k)
658 {
659 WT w = heap [k];
660
661 while (k < (N >> 1))
662 {
663 int j = k << 1;
664
665 if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
666 ++j;
667
668 if (w->at <= heap [j]->at)
669 break;
670
671 heap [k] = heap [j];
672 ((W)heap [k])->active = k + 1;
673 k = j;
674 }
675
676 heap [k] = w;
677 ((W)heap [k])->active = k + 1;
678 }
679
680 void inline_size
681 adjustheap (WT *heap, int N, int k)
682 {
683 upheap (heap, k);
684 downheap (heap, N, k);
685 }
686
687 /*****************************************************************************/
688
689 typedef struct
690 {
691 WL head;
692 sig_atomic_t volatile gotsig;
693 } ANSIG;
694
695 static ANSIG *signals;
696 static int signalmax;
697
698 static int sigpipe [2];
699 static sig_atomic_t volatile gotsig;
700 static ev_io sigev;
701
702 void inline_size
703 signals_init (ANSIG *base, int count)
704 {
705 while (count--)
706 {
707 base->head = 0;
708 base->gotsig = 0;
709
710 ++base;
711 }
712 }
713
714 static void
715 sighandler (int signum)
716 {
717 #if _WIN32
718 signal (signum, sighandler);
719 #endif
720
721 signals [signum - 1].gotsig = 1;
722
723 if (!gotsig)
724 {
725 int old_errno = errno;
726 gotsig = 1;
727 write (sigpipe [1], &signum, 1);
728 errno = old_errno;
729 }
730 }
731
732 void noinline
733 ev_feed_signal_event (EV_P_ int signum)
734 {
735 WL w;
736
737 #if EV_MULTIPLICITY
738 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
739 #endif
740
741 --signum;
742
743 if (signum < 0 || signum >= signalmax)
744 return;
745
746 signals [signum].gotsig = 0;
747
748 for (w = signals [signum].head; w; w = w->next)
749 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
750 }
751
752 static void
753 sigcb (EV_P_ ev_io *iow, int revents)
754 {
755 int signum;
756
757 read (sigpipe [0], &revents, 1);
758 gotsig = 0;
759
760 for (signum = signalmax; signum--; )
761 if (signals [signum].gotsig)
762 ev_feed_signal_event (EV_A_ signum + 1);
763 }
764
765 void inline_speed
766 fd_intern (int fd)
767 {
768 #ifdef _WIN32
769 int arg = 1;
770 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
771 #else
772 fcntl (fd, F_SETFD, FD_CLOEXEC);
773 fcntl (fd, F_SETFL, O_NONBLOCK);
774 #endif
775 }
776
777 static void noinline
778 siginit (EV_P)
779 {
780 fd_intern (sigpipe [0]);
781 fd_intern (sigpipe [1]);
782
783 ev_io_set (&sigev, sigpipe [0], EV_READ);
784 ev_io_start (EV_A_ &sigev);
785 ev_unref (EV_A); /* child watcher should not keep loop alive */
786 }
787
788 /*****************************************************************************/
789
790 static ev_child *childs [EV_PID_HASHSIZE];
791
792 #ifndef _WIN32
793
794 static ev_signal childev;
795
796 void inline_speed
797 child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
798 {
799 ev_child *w;
800
801 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
802 if (w->pid == pid || !w->pid)
803 {
804 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
805 w->rpid = pid;
806 w->rstatus = status;
807 ev_feed_event (EV_A_ (W)w, EV_CHILD);
808 }
809 }
810
811 #ifndef WCONTINUED
812 # define WCONTINUED 0
813 #endif
814
815 static void
816 childcb (EV_P_ ev_signal *sw, int revents)
817 {
818 int pid, status;
819
820 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
821 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
822 if (!WCONTINUED
823 || errno != EINVAL
824 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
825 return;
826
827 /* make sure we are called again until all childs have been reaped */
828 /* we need to do it this way so that the callback gets called before we continue */
829 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
830
831 child_reap (EV_A_ sw, pid, pid, status);
832 if (EV_PID_HASHSIZE > 1)
833 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
834 }
835
836 #endif
837
838 /*****************************************************************************/
839
840 #if EV_USE_PORT
841 # include "ev_port.c"
842 #endif
843 #if EV_USE_KQUEUE
844 # include "ev_kqueue.c"
845 #endif
846 #if EV_USE_EPOLL
847 # include "ev_epoll.c"
848 #endif
849 #if EV_USE_POLL
850 # include "ev_poll.c"
851 #endif
852 #if EV_USE_SELECT
853 # include "ev_select.c"
854 #endif
855
856 int
857 ev_version_major (void)
858 {
859 return EV_VERSION_MAJOR;
860 }
861
862 int
863 ev_version_minor (void)
864 {
865 return EV_VERSION_MINOR;
866 }
867
868 /* return true if we are running with elevated privileges and should ignore env variables */
869 int inline_size
870 enable_secure (void)
871 {
872 #ifdef _WIN32
873 return 0;
874 #else
875 return getuid () != geteuid ()
876 || getgid () != getegid ();
877 #endif
878 }
879
880 unsigned int
881 ev_supported_backends (void)
882 {
883 unsigned int flags = 0;
884
885 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
886 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
887 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
888 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
889 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
890
891 return flags;
892 }
893
894 unsigned int
895 ev_recommended_backends (void)
896 {
897 unsigned int flags = ev_supported_backends ();
898
899 #ifndef __NetBSD__
900 /* kqueue is borked on everything but netbsd apparently */
901 /* it usually doesn't work correctly on anything but sockets and pipes */
902 flags &= ~EVBACKEND_KQUEUE;
903 #endif
904 #ifdef __APPLE__
905 // flags &= ~EVBACKEND_KQUEUE; for documentation
906 flags &= ~EVBACKEND_POLL;
907 #endif
908
909 return flags;
910 }
911
912 unsigned int
913 ev_embeddable_backends (void)
914 {
915 return EVBACKEND_EPOLL
916 | EVBACKEND_KQUEUE
917 | EVBACKEND_PORT;
918 }
919
920 unsigned int
921 ev_backend (EV_P)
922 {
923 return backend;
924 }
925
926 unsigned int
927 ev_loop_count (EV_P)
928 {
929 return loop_count;
930 }
931
932 static void noinline
933 loop_init (EV_P_ unsigned int flags)
934 {
935 if (!backend)
936 {
937 #if EV_USE_MONOTONIC
938 {
939 struct timespec ts;
940 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
941 have_monotonic = 1;
942 }
943 #endif
944
945 ev_rt_now = ev_time ();
946 mn_now = get_clock ();
947 now_floor = mn_now;
948 rtmn_diff = ev_rt_now - mn_now;
949
950 /* pid check not overridable via env */
951 #ifndef _WIN32
952 if (flags & EVFLAG_FORKCHECK)
953 curpid = getpid ();
954 #endif
955
956 if (!(flags & EVFLAG_NOENV)
957 && !enable_secure ()
958 && getenv ("LIBEV_FLAGS"))
959 flags = atoi (getenv ("LIBEV_FLAGS"));
960
961 if (!(flags & 0x0000ffffUL))
962 flags |= ev_recommended_backends ();
963
964 backend = 0;
965 backend_fd = -1;
966 #if EV_USE_INOTIFY
967 fs_fd = -2;
968 #endif
969
970 #if EV_USE_PORT
971 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
972 #endif
973 #if EV_USE_KQUEUE
974 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
975 #endif
976 #if EV_USE_EPOLL
977 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
978 #endif
979 #if EV_USE_POLL
980 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
981 #endif
982 #if EV_USE_SELECT
983 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
984 #endif
985
986 ev_init (&sigev, sigcb);
987 ev_set_priority (&sigev, EV_MAXPRI);
988 }
989 }
990
991 static void noinline
992 loop_destroy (EV_P)
993 {
994 int i;
995
996 #if EV_USE_INOTIFY
997 if (fs_fd >= 0)
998 close (fs_fd);
999 #endif
1000
1001 if (backend_fd >= 0)
1002 close (backend_fd);
1003
1004 #if EV_USE_PORT
1005 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1006 #endif
1007 #if EV_USE_KQUEUE
1008 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1009 #endif
1010 #if EV_USE_EPOLL
1011 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1012 #endif
1013 #if EV_USE_POLL
1014 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1015 #endif
1016 #if EV_USE_SELECT
1017 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1018 #endif
1019
1020 for (i = NUMPRI; i--; )
1021 {
1022 array_free (pending, [i]);
1023 #if EV_IDLE_ENABLE
1024 array_free (idle, [i]);
1025 #endif
1026 }
1027
1028 /* have to use the microsoft-never-gets-it-right macro */
1029 array_free (fdchange, EMPTY);
1030 array_free (timer, EMPTY);
1031 #if EV_PERIODIC_ENABLE
1032 array_free (periodic, EMPTY);
1033 #endif
1034 array_free (prepare, EMPTY);
1035 array_free (check, EMPTY);
1036
1037 backend = 0;
1038 }
1039
1040 void inline_size infy_fork (EV_P);
1041
1042 void inline_size
1043 loop_fork (EV_P)
1044 {
1045 #if EV_USE_PORT
1046 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1047 #endif
1048 #if EV_USE_KQUEUE
1049 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1050 #endif
1051 #if EV_USE_EPOLL
1052 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1053 #endif
1054 #if EV_USE_INOTIFY
1055 infy_fork (EV_A);
1056 #endif
1057
1058 if (ev_is_active (&sigev))
1059 {
1060 /* default loop */
1061
1062 ev_ref (EV_A);
1063 ev_io_stop (EV_A_ &sigev);
1064 close (sigpipe [0]);
1065 close (sigpipe [1]);
1066
1067 while (pipe (sigpipe))
1068 syserr ("(libev) error creating pipe");
1069
1070 siginit (EV_A);
1071 }
1072
1073 postfork = 0;
1074 }
1075
1076 #if EV_MULTIPLICITY
1077 struct ev_loop *
1078 ev_loop_new (unsigned int flags)
1079 {
1080 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1081
1082 memset (loop, 0, sizeof (struct ev_loop));
1083
1084 loop_init (EV_A_ flags);
1085
1086 if (ev_backend (EV_A))
1087 return loop;
1088
1089 return 0;
1090 }
1091
1092 void
1093 ev_loop_destroy (EV_P)
1094 {
1095 loop_destroy (EV_A);
1096 ev_free (loop);
1097 }
1098
1099 void
1100 ev_loop_fork (EV_P)
1101 {
1102 postfork = 1;
1103 }
1104
1105 #endif
1106
1107 #if EV_MULTIPLICITY
1108 struct ev_loop *
1109 ev_default_loop_init (unsigned int flags)
1110 #else
1111 int
1112 ev_default_loop (unsigned int flags)
1113 #endif
1114 {
1115 if (sigpipe [0] == sigpipe [1])
1116 if (pipe (sigpipe))
1117 return 0;
1118
1119 if (!ev_default_loop_ptr)
1120 {
1121 #if EV_MULTIPLICITY
1122 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1123 #else
1124 ev_default_loop_ptr = 1;
1125 #endif
1126
1127 loop_init (EV_A_ flags);
1128
1129 if (ev_backend (EV_A))
1130 {
1131 siginit (EV_A);
1132
1133 #ifndef _WIN32
1134 ev_signal_init (&childev, childcb, SIGCHLD);
1135 ev_set_priority (&childev, EV_MAXPRI);
1136 ev_signal_start (EV_A_ &childev);
1137 ev_unref (EV_A); /* child watcher should not keep loop alive */
1138 #endif
1139 }
1140 else
1141 ev_default_loop_ptr = 0;
1142 }
1143
1144 return ev_default_loop_ptr;
1145 }
1146
1147 void
1148 ev_default_destroy (void)
1149 {
1150 #if EV_MULTIPLICITY
1151 struct ev_loop *loop = ev_default_loop_ptr;
1152 #endif
1153
1154 #ifndef _WIN32
1155 ev_ref (EV_A); /* child watcher */
1156 ev_signal_stop (EV_A_ &childev);
1157 #endif
1158
1159 ev_ref (EV_A); /* signal watcher */
1160 ev_io_stop (EV_A_ &sigev);
1161
1162 close (sigpipe [0]); sigpipe [0] = 0;
1163 close (sigpipe [1]); sigpipe [1] = 0;
1164
1165 loop_destroy (EV_A);
1166 }
1167
1168 void
1169 ev_default_fork (void)
1170 {
1171 #if EV_MULTIPLICITY
1172 struct ev_loop *loop = ev_default_loop_ptr;
1173 #endif
1174
1175 if (backend)
1176 postfork = 1;
1177 }
1178
1179 /*****************************************************************************/
1180
1181 void
1182 ev_invoke (EV_P_ void *w, int revents)
1183 {
1184 EV_CB_INVOKE ((W)w, revents);
1185 }
1186
1187 void inline_speed
1188 call_pending (EV_P)
1189 {
1190 int pri;
1191
1192 for (pri = NUMPRI; pri--; )
1193 while (pendingcnt [pri])
1194 {
1195 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1196
1197 if (expect_true (p->w))
1198 {
1199 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1200
1201 p->w->pending = 0;
1202 EV_CB_INVOKE (p->w, p->events);
1203 }
1204 }
1205 }
1206
1207 void inline_size
1208 timers_reify (EV_P)
1209 {
1210 while (timercnt && ((WT)timers [0])->at <= mn_now)
1211 {
1212 ev_timer *w = timers [0];
1213
1214 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1215
1216 /* first reschedule or stop timer */
1217 if (w->repeat)
1218 {
1219 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1220
1221 ((WT)w)->at += w->repeat;
1222 if (((WT)w)->at < mn_now)
1223 ((WT)w)->at = mn_now;
1224
1225 downheap ((WT *)timers, timercnt, 0);
1226 }
1227 else
1228 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1229
1230 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1231 }
1232 }
1233
1234 #if EV_PERIODIC_ENABLE
1235 void inline_size
1236 periodics_reify (EV_P)
1237 {
1238 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1239 {
1240 ev_periodic *w = periodics [0];
1241
1242 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1243
1244 /* first reschedule or stop timer */
1245 if (w->reschedule_cb)
1246 {
1247 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1248 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1249 downheap ((WT *)periodics, periodiccnt, 0);
1250 }
1251 else if (w->interval)
1252 {
1253 ((WT)w)->at = w->offset + floor ((ev_rt_now + TIME_EPSILON - w->offset) / w->interval + 1.) * w->interval;
1254 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1255 downheap ((WT *)periodics, periodiccnt, 0);
1256 }
1257 else
1258 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1259
1260 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1261 }
1262 }
1263
1264 static void noinline
1265 periodics_reschedule (EV_P)
1266 {
1267 int i;
1268
1269 /* adjust periodics after time jump */
1270 for (i = 0; i < periodiccnt; ++i)
1271 {
1272 ev_periodic *w = periodics [i];
1273
1274 if (w->reschedule_cb)
1275 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1276 else if (w->interval)
1277 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1278 }
1279
1280 /* now rebuild the heap */
1281 for (i = periodiccnt >> 1; i--; )
1282 downheap ((WT *)periodics, periodiccnt, i);
1283 }
1284 #endif
1285
1286 #if EV_IDLE_ENABLE
1287 void inline_size
1288 idle_reify (EV_P)
1289 {
1290 if (expect_false (idleall))
1291 {
1292 int pri;
1293
1294 for (pri = NUMPRI; pri--; )
1295 {
1296 if (pendingcnt [pri])
1297 break;
1298
1299 if (idlecnt [pri])
1300 {
1301 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1302 break;
1303 }
1304 }
1305 }
1306 }
1307 #endif
1308
1309 int inline_size
1310 time_update_monotonic (EV_P)
1311 {
1312 mn_now = get_clock ();
1313
1314 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1315 {
1316 ev_rt_now = rtmn_diff + mn_now;
1317 return 0;
1318 }
1319 else
1320 {
1321 now_floor = mn_now;
1322 ev_rt_now = ev_time ();
1323 return 1;
1324 }
1325 }
1326
1327 void inline_size
1328 time_update (EV_P)
1329 {
1330 int i;
1331
1332 #if EV_USE_MONOTONIC
1333 if (expect_true (have_monotonic))
1334 {
1335 if (time_update_monotonic (EV_A))
1336 {
1337 ev_tstamp odiff = rtmn_diff;
1338
1339 /* loop a few times, before making important decisions.
1340 * on the choice of "4": one iteration isn't enough,
1341 * in case we get preempted during the calls to
1342 * ev_time and get_clock. a second call is almost guaranteed
1343 * to succeed in that case, though. and looping a few more times
1344 * doesn't hurt either as we only do this on time-jumps or
1345 * in the unlikely event of having been preempted here.
1346 */
1347 for (i = 4; --i; )
1348 {
1349 rtmn_diff = ev_rt_now - mn_now;
1350
1351 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1352 return; /* all is well */
1353
1354 ev_rt_now = ev_time ();
1355 mn_now = get_clock ();
1356 now_floor = mn_now;
1357 }
1358
1359 # if EV_PERIODIC_ENABLE
1360 periodics_reschedule (EV_A);
1361 # endif
1362 /* no timer adjustment, as the monotonic clock doesn't jump */
1363 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1364 }
1365 }
1366 else
1367 #endif
1368 {
1369 ev_rt_now = ev_time ();
1370
1371 if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
1372 {
1373 #if EV_PERIODIC_ENABLE
1374 periodics_reschedule (EV_A);
1375 #endif
1376
1377 /* adjust timers. this is easy, as the offset is the same for all of them */
1378 for (i = 0; i < timercnt; ++i)
1379 ((WT)timers [i])->at += ev_rt_now - mn_now;
1380 }
1381
1382 mn_now = ev_rt_now;
1383 }
1384 }
1385
1386 void
1387 ev_ref (EV_P)
1388 {
1389 ++activecnt;
1390 }
1391
1392 void
1393 ev_unref (EV_P)
1394 {
1395 --activecnt;
1396 }
1397
1398 static int loop_done;
1399
1400 void
1401 ev_loop (EV_P_ int flags)
1402 {
1403 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1404 ? EVUNLOOP_ONE
1405 : EVUNLOOP_CANCEL;
1406
1407 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1408
1409 do
1410 {
1411 #ifndef _WIN32
1412 if (expect_false (curpid)) /* penalise the forking check even more */
1413 if (expect_false (getpid () != curpid))
1414 {
1415 curpid = getpid ();
1416 postfork = 1;
1417 }
1418 #endif
1419
1420 #if EV_FORK_ENABLE
1421 /* we might have forked, so queue fork handlers */
1422 if (expect_false (postfork))
1423 if (forkcnt)
1424 {
1425 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1426 call_pending (EV_A);
1427 }
1428 #endif
1429
1430 /* queue prepare watchers (and execute them) */
1431 if (expect_false (preparecnt))
1432 {
1433 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1434 call_pending (EV_A);
1435 }
1436
1437 if (expect_false (!activecnt))
1438 break;
1439
1440 /* we might have forked, so reify kernel state if necessary */
1441 if (expect_false (postfork))
1442 loop_fork (EV_A);
1443
1444 /* update fd-related kernel structures */
1445 fd_reify (EV_A);
1446
1447 /* calculate blocking time */
1448 {
1449 ev_tstamp block;
1450
1451 if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
1452 block = 0.; /* do not block at all */
1453 else
1454 {
1455 /* update time to cancel out callback processing overhead */
1456 #if EV_USE_MONOTONIC
1457 if (expect_true (have_monotonic))
1458 time_update_monotonic (EV_A);
1459 else
1460 #endif
1461 {
1462 ev_rt_now = ev_time ();
1463 mn_now = ev_rt_now;
1464 }
1465
1466 block = MAX_BLOCKTIME;
1467
1468 if (timercnt)
1469 {
1470 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1471 if (block > to) block = to;
1472 }
1473
1474 #if EV_PERIODIC_ENABLE
1475 if (periodiccnt)
1476 {
1477 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1478 if (block > to) block = to;
1479 }
1480 #endif
1481
1482 if (expect_false (block < 0.)) block = 0.;
1483 }
1484
1485 ++loop_count;
1486 backend_poll (EV_A_ block);
1487 }
1488
1489 /* update ev_rt_now, do magic */
1490 time_update (EV_A);
1491
1492 /* queue pending timers and reschedule them */
1493 timers_reify (EV_A); /* relative timers called last */
1494 #if EV_PERIODIC_ENABLE
1495 periodics_reify (EV_A); /* absolute timers called first */
1496 #endif
1497
1498 #if EV_IDLE_ENABLE
1499 /* queue idle watchers unless other events are pending */
1500 idle_reify (EV_A);
1501 #endif
1502
1503 /* queue check watchers, to be executed first */
1504 if (expect_false (checkcnt))
1505 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1506
1507 call_pending (EV_A);
1508
1509 }
1510 while (expect_true (activecnt && !loop_done));
1511
1512 if (loop_done == EVUNLOOP_ONE)
1513 loop_done = EVUNLOOP_CANCEL;
1514 }
1515
1516 void
1517 ev_unloop (EV_P_ int how)
1518 {
1519 loop_done = how;
1520 }
1521
1522 /*****************************************************************************/
1523
1524 void inline_size
1525 wlist_add (WL *head, WL elem)
1526 {
1527 elem->next = *head;
1528 *head = elem;
1529 }
1530
1531 void inline_size
1532 wlist_del (WL *head, WL elem)
1533 {
1534 while (*head)
1535 {
1536 if (*head == elem)
1537 {
1538 *head = elem->next;
1539 return;
1540 }
1541
1542 head = &(*head)->next;
1543 }
1544 }
1545
1546 void inline_speed
1547 clear_pending (EV_P_ W w)
1548 {
1549 if (w->pending)
1550 {
1551 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1552 w->pending = 0;
1553 }
1554 }
1555
1556 int
1557 ev_clear_pending (EV_P_ void *w)
1558 {
1559 W w_ = (W)w;
1560 int pending = w_->pending;
1561
1562 if (expect_true (pending))
1563 {
1564 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1565 w_->pending = 0;
1566 p->w = 0;
1567 return p->events;
1568 }
1569 else
1570 return 0;
1571 }
1572
1573 void inline_size
1574 pri_adjust (EV_P_ W w)
1575 {
1576 int pri = w->priority;
1577 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1578 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1579 w->priority = pri;
1580 }
1581
1582 void inline_speed
1583 ev_start (EV_P_ W w, int active)
1584 {
1585 pri_adjust (EV_A_ w);
1586 w->active = active;
1587 ev_ref (EV_A);
1588 }
1589
1590 void inline_size
1591 ev_stop (EV_P_ W w)
1592 {
1593 ev_unref (EV_A);
1594 w->active = 0;
1595 }
1596
1597 /*****************************************************************************/
1598
1599 void noinline
1600 ev_io_start (EV_P_ ev_io *w)
1601 {
1602 int fd = w->fd;
1603
1604 if (expect_false (ev_is_active (w)))
1605 return;
1606
1607 assert (("ev_io_start called with negative fd", fd >= 0));
1608
1609 ev_start (EV_A_ (W)w, 1);
1610 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1611 wlist_add ((WL *)&anfds[fd].head, (WL)w);
1612
1613 fd_change (EV_A_ fd);
1614 }
1615
1616 void noinline
1617 ev_io_stop (EV_P_ ev_io *w)
1618 {
1619 clear_pending (EV_A_ (W)w);
1620 if (expect_false (!ev_is_active (w)))
1621 return;
1622
1623 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1624
1625 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
1626 ev_stop (EV_A_ (W)w);
1627
1628 fd_change (EV_A_ w->fd);
1629 }
1630
1631 void noinline
1632 ev_timer_start (EV_P_ ev_timer *w)
1633 {
1634 if (expect_false (ev_is_active (w)))
1635 return;
1636
1637 ((WT)w)->at += mn_now;
1638
1639 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1640
1641 ev_start (EV_A_ (W)w, ++timercnt);
1642 array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
1643 timers [timercnt - 1] = w;
1644 upheap ((WT *)timers, timercnt - 1);
1645
1646 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1647 }
1648
1649 void noinline
1650 ev_timer_stop (EV_P_ ev_timer *w)
1651 {
1652 clear_pending (EV_A_ (W)w);
1653 if (expect_false (!ev_is_active (w)))
1654 return;
1655
1656 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1657
1658 {
1659 int active = ((W)w)->active;
1660
1661 if (expect_true (--active < --timercnt))
1662 {
1663 timers [active] = timers [timercnt];
1664 adjustheap ((WT *)timers, timercnt, active);
1665 }
1666 }
1667
1668 ((WT)w)->at -= mn_now;
1669
1670 ev_stop (EV_A_ (W)w);
1671 }
1672
1673 void noinline
1674 ev_timer_again (EV_P_ ev_timer *w)
1675 {
1676 if (ev_is_active (w))
1677 {
1678 if (w->repeat)
1679 {
1680 ((WT)w)->at = mn_now + w->repeat;
1681 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1682 }
1683 else
1684 ev_timer_stop (EV_A_ w);
1685 }
1686 else if (w->repeat)
1687 {
1688 w->at = w->repeat;
1689 ev_timer_start (EV_A_ w);
1690 }
1691 }
1692
1693 #if EV_PERIODIC_ENABLE
1694 void noinline
1695 ev_periodic_start (EV_P_ ev_periodic *w)
1696 {
1697 if (expect_false (ev_is_active (w)))
1698 return;
1699
1700 if (w->reschedule_cb)
1701 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1702 else if (w->interval)
1703 {
1704 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1705 /* this formula differs from the one in periodic_reify because we do not always round up */
1706 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1707 }
1708 else
1709 ((WT)w)->at = w->offset;
1710
1711 ev_start (EV_A_ (W)w, ++periodiccnt);
1712 array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
1713 periodics [periodiccnt - 1] = w;
1714 upheap ((WT *)periodics, periodiccnt - 1);
1715
1716 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1717 }
1718
1719 void noinline
1720 ev_periodic_stop (EV_P_ ev_periodic *w)
1721 {
1722 clear_pending (EV_A_ (W)w);
1723 if (expect_false (!ev_is_active (w)))
1724 return;
1725
1726 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1727
1728 {
1729 int active = ((W)w)->active;
1730
1731 if (expect_true (--active < --periodiccnt))
1732 {
1733 periodics [active] = periodics [periodiccnt];
1734 adjustheap ((WT *)periodics, periodiccnt, active);
1735 }
1736 }
1737
1738 ev_stop (EV_A_ (W)w);
1739 }
1740
1741 void noinline
1742 ev_periodic_again (EV_P_ ev_periodic *w)
1743 {
1744 /* TODO: use adjustheap and recalculation */
1745 ev_periodic_stop (EV_A_ w);
1746 ev_periodic_start (EV_A_ w);
1747 }
1748 #endif
1749
1750 #ifndef SA_RESTART
1751 # define SA_RESTART 0
1752 #endif
1753
1754 void noinline
1755 ev_signal_start (EV_P_ ev_signal *w)
1756 {
1757 #if EV_MULTIPLICITY
1758 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1759 #endif
1760 if (expect_false (ev_is_active (w)))
1761 return;
1762
1763 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1764
1765 ev_start (EV_A_ (W)w, 1);
1766 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1767 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
1768
1769 if (!((WL)w)->next)
1770 {
1771 #if _WIN32
1772 signal (w->signum, sighandler);
1773 #else
1774 struct sigaction sa;
1775 sa.sa_handler = sighandler;
1776 sigfillset (&sa.sa_mask);
1777 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1778 sigaction (w->signum, &sa, 0);
1779 #endif
1780 }
1781 }
1782
1783 void noinline
1784 ev_signal_stop (EV_P_ ev_signal *w)
1785 {
1786 clear_pending (EV_A_ (W)w);
1787 if (expect_false (!ev_is_active (w)))
1788 return;
1789
1790 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1791 ev_stop (EV_A_ (W)w);
1792
1793 if (!signals [w->signum - 1].head)
1794 signal (w->signum, SIG_DFL);
1795 }
1796
1797 void
1798 ev_child_start (EV_P_ ev_child *w)
1799 {
1800 #if EV_MULTIPLICITY
1801 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1802 #endif
1803 if (expect_false (ev_is_active (w)))
1804 return;
1805
1806 ev_start (EV_A_ (W)w, 1);
1807 wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1808 }
1809
1810 void
1811 ev_child_stop (EV_P_ ev_child *w)
1812 {
1813 clear_pending (EV_A_ (W)w);
1814 if (expect_false (!ev_is_active (w)))
1815 return;
1816
1817 wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1818 ev_stop (EV_A_ (W)w);
1819 }
1820
1821 #if EV_STAT_ENABLE
1822
1823 # ifdef _WIN32
1824 # undef lstat
1825 # define lstat(a,b) _stati64 (a,b)
1826 # endif
1827
1828 #define DEF_STAT_INTERVAL 5.0074891
1829 #define MIN_STAT_INTERVAL 0.1074891
1830
1831 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
1832
1833 #if EV_USE_INOTIFY
1834 # define EV_INOTIFY_BUFSIZE 8192
1835
1836 static void noinline
1837 infy_add (EV_P_ ev_stat *w)
1838 {
1839 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);
1840
1841 if (w->wd < 0)
1842 {
1843 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
1844
1845 /* monitor some parent directory for speedup hints */
1846 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
1847 {
1848 char path [4096];
1849 strcpy (path, w->path);
1850
1851 do
1852 {
1853 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
1854 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
1855
1856 char *pend = strrchr (path, '/');
1857
1858 if (!pend)
1859 break; /* whoops, no '/', complain to your admin */
1860
1861 *pend = 0;
1862 w->wd = inotify_add_watch (fs_fd, path, mask);
1863 }
1864 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
1865 }
1866 }
1867 else
1868 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
1869
1870 if (w->wd >= 0)
1871 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
1872 }
1873
1874 static void noinline
1875 infy_del (EV_P_ ev_stat *w)
1876 {
1877 int slot;
1878 int wd = w->wd;
1879
1880 if (wd < 0)
1881 return;
1882
1883 w->wd = -2;
1884 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
1885 wlist_del (&fs_hash [slot].head, (WL)w);
1886
1887 /* remove this watcher, if others are watching it, they will rearm */
1888 inotify_rm_watch (fs_fd, wd);
1889 }
1890
1891 static void noinline
1892 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
1893 {
1894 if (slot < 0)
1895 /* overflow, need to check for all hahs slots */
1896 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1897 infy_wd (EV_A_ slot, wd, ev);
1898 else
1899 {
1900 WL w_;
1901
1902 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
1903 {
1904 ev_stat *w = (ev_stat *)w_;
1905 w_ = w_->next; /* lets us remove this watcher and all before it */
1906
1907 if (w->wd == wd || wd == -1)
1908 {
1909 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
1910 {
1911 w->wd = -1;
1912 infy_add (EV_A_ w); /* re-add, no matter what */
1913 }
1914
1915 stat_timer_cb (EV_A_ &w->timer, 0);
1916 }
1917 }
1918 }
1919 }
1920
1921 static void
1922 infy_cb (EV_P_ ev_io *w, int revents)
1923 {
1924 char buf [EV_INOTIFY_BUFSIZE];
1925 struct inotify_event *ev = (struct inotify_event *)buf;
1926 int ofs;
1927 int len = read (fs_fd, buf, sizeof (buf));
1928
1929 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
1930 infy_wd (EV_A_ ev->wd, ev->wd, ev);
1931 }
1932
1933 void inline_size
1934 infy_init (EV_P)
1935 {
1936 if (fs_fd != -2)
1937 return;
1938
1939 fs_fd = inotify_init ();
1940
1941 if (fs_fd >= 0)
1942 {
1943 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
1944 ev_set_priority (&fs_w, EV_MAXPRI);
1945 ev_io_start (EV_A_ &fs_w);
1946 }
1947 }
1948
1949 void inline_size
1950 infy_fork (EV_P)
1951 {
1952 int slot;
1953
1954 if (fs_fd < 0)
1955 return;
1956
1957 close (fs_fd);
1958 fs_fd = inotify_init ();
1959
1960 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1961 {
1962 WL w_ = fs_hash [slot].head;
1963 fs_hash [slot].head = 0;
1964
1965 while (w_)
1966 {
1967 ev_stat *w = (ev_stat *)w_;
1968 w_ = w_->next; /* lets us add this watcher */
1969
1970 w->wd = -1;
1971
1972 if (fs_fd >= 0)
1973 infy_add (EV_A_ w); /* re-add, no matter what */
1974 else
1975 ev_timer_start (EV_A_ &w->timer);
1976 }
1977
1978 }
1979 }
1980
1981 #endif
1982
1983 void
1984 ev_stat_stat (EV_P_ ev_stat *w)
1985 {
1986 if (lstat (w->path, &w->attr) < 0)
1987 w->attr.st_nlink = 0;
1988 else if (!w->attr.st_nlink)
1989 w->attr.st_nlink = 1;
1990 }
1991
1992 static void noinline
1993 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
1994 {
1995 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
1996
1997 /* we copy this here each the time so that */
1998 /* prev has the old value when the callback gets invoked */
1999 w->prev = w->attr;
2000 ev_stat_stat (EV_A_ w);
2001
2002 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2003 if (
2004 w->prev.st_dev != w->attr.st_dev
2005 || w->prev.st_ino != w->attr.st_ino
2006 || w->prev.st_mode != w->attr.st_mode
2007 || w->prev.st_nlink != w->attr.st_nlink
2008 || w->prev.st_uid != w->attr.st_uid
2009 || w->prev.st_gid != w->attr.st_gid
2010 || w->prev.st_rdev != w->attr.st_rdev
2011 || w->prev.st_size != w->attr.st_size
2012 || w->prev.st_atime != w->attr.st_atime
2013 || w->prev.st_mtime != w->attr.st_mtime
2014 || w->prev.st_ctime != w->attr.st_ctime
2015 ) {
2016 #if EV_USE_INOTIFY
2017 infy_del (EV_A_ w);
2018 infy_add (EV_A_ w);
2019 ev_stat_stat (EV_A_ w); /* avoid race... */
2020 #endif
2021
2022 ev_feed_event (EV_A_ w, EV_STAT);
2023 }
2024 }
2025
2026 void
2027 ev_stat_start (EV_P_ ev_stat *w)
2028 {
2029 if (expect_false (ev_is_active (w)))
2030 return;
2031
2032 /* since we use memcmp, we need to clear any padding data etc. */
2033 memset (&w->prev, 0, sizeof (ev_statdata));
2034 memset (&w->attr, 0, sizeof (ev_statdata));
2035
2036 ev_stat_stat (EV_A_ w);
2037
2038 if (w->interval < MIN_STAT_INTERVAL)
2039 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2040
2041 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2042 ev_set_priority (&w->timer, ev_priority (w));
2043
2044 #if EV_USE_INOTIFY
2045 infy_init (EV_A);
2046
2047 if (fs_fd >= 0)
2048 infy_add (EV_A_ w);
2049 else
2050 #endif
2051 ev_timer_start (EV_A_ &w->timer);
2052
2053 ev_start (EV_A_ (W)w, 1);
2054 }
2055
2056 void
2057 ev_stat_stop (EV_P_ ev_stat *w)
2058 {
2059 clear_pending (EV_A_ (W)w);
2060 if (expect_false (!ev_is_active (w)))
2061 return;
2062
2063 #if EV_USE_INOTIFY
2064 infy_del (EV_A_ w);
2065 #endif
2066 ev_timer_stop (EV_A_ &w->timer);
2067
2068 ev_stop (EV_A_ (W)w);
2069 }
2070 #endif
2071
2072 #if EV_IDLE_ENABLE
2073 void
2074 ev_idle_start (EV_P_ ev_idle *w)
2075 {
2076 if (expect_false (ev_is_active (w)))
2077 return;
2078
2079 pri_adjust (EV_A_ (W)w);
2080
2081 {
2082 int active = ++idlecnt [ABSPRI (w)];
2083
2084 ++idleall;
2085 ev_start (EV_A_ (W)w, active);
2086
2087 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2088 idles [ABSPRI (w)][active - 1] = w;
2089 }
2090 }
2091
2092 void
2093 ev_idle_stop (EV_P_ ev_idle *w)
2094 {
2095 clear_pending (EV_A_ (W)w);
2096 if (expect_false (!ev_is_active (w)))
2097 return;
2098
2099 {
2100 int active = ((W)w)->active;
2101
2102 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2103 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2104
2105 ev_stop (EV_A_ (W)w);
2106 --idleall;
2107 }
2108 }
2109 #endif
2110
2111 void
2112 ev_prepare_start (EV_P_ ev_prepare *w)
2113 {
2114 if (expect_false (ev_is_active (w)))
2115 return;
2116
2117 ev_start (EV_A_ (W)w, ++preparecnt);
2118 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2119 prepares [preparecnt - 1] = w;
2120 }
2121
2122 void
2123 ev_prepare_stop (EV_P_ ev_prepare *w)
2124 {
2125 clear_pending (EV_A_ (W)w);
2126 if (expect_false (!ev_is_active (w)))
2127 return;
2128
2129 {
2130 int active = ((W)w)->active;
2131 prepares [active - 1] = prepares [--preparecnt];
2132 ((W)prepares [active - 1])->active = active;
2133 }
2134
2135 ev_stop (EV_A_ (W)w);
2136 }
2137
2138 void
2139 ev_check_start (EV_P_ ev_check *w)
2140 {
2141 if (expect_false (ev_is_active (w)))
2142 return;
2143
2144 ev_start (EV_A_ (W)w, ++checkcnt);
2145 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2146 checks [checkcnt - 1] = w;
2147 }
2148
2149 void
2150 ev_check_stop (EV_P_ ev_check *w)
2151 {
2152 clear_pending (EV_A_ (W)w);
2153 if (expect_false (!ev_is_active (w)))
2154 return;
2155
2156 {
2157 int active = ((W)w)->active;
2158 checks [active - 1] = checks [--checkcnt];
2159 ((W)checks [active - 1])->active = active;
2160 }
2161
2162 ev_stop (EV_A_ (W)w);
2163 }
2164
2165 #if EV_EMBED_ENABLE
2166 void noinline
2167 ev_embed_sweep (EV_P_ ev_embed *w)
2168 {
2169 ev_loop (w->loop, EVLOOP_NONBLOCK);
2170 }
2171
2172 static void
2173 embed_cb (EV_P_ ev_io *io, int revents)
2174 {
2175 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2176
2177 if (ev_cb (w))
2178 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2179 else
2180 ev_embed_sweep (loop, w);
2181 }
2182
2183 void
2184 ev_embed_start (EV_P_ ev_embed *w)
2185 {
2186 if (expect_false (ev_is_active (w)))
2187 return;
2188
2189 {
2190 struct ev_loop *loop = w->loop;
2191 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2192 ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
2193 }
2194
2195 ev_set_priority (&w->io, ev_priority (w));
2196 ev_io_start (EV_A_ &w->io);
2197
2198 ev_start (EV_A_ (W)w, 1);
2199 }
2200
2201 void
2202 ev_embed_stop (EV_P_ ev_embed *w)
2203 {
2204 clear_pending (EV_A_ (W)w);
2205 if (expect_false (!ev_is_active (w)))
2206 return;
2207
2208 ev_io_stop (EV_A_ &w->io);
2209
2210 ev_stop (EV_A_ (W)w);
2211 }
2212 #endif
2213
2214 #if EV_FORK_ENABLE
2215 void
2216 ev_fork_start (EV_P_ ev_fork *w)
2217 {
2218 if (expect_false (ev_is_active (w)))
2219 return;
2220
2221 ev_start (EV_A_ (W)w, ++forkcnt);
2222 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2223 forks [forkcnt - 1] = w;
2224 }
2225
2226 void
2227 ev_fork_stop (EV_P_ ev_fork *w)
2228 {
2229 clear_pending (EV_A_ (W)w);
2230 if (expect_false (!ev_is_active (w)))
2231 return;
2232
2233 {
2234 int active = ((W)w)->active;
2235 forks [active - 1] = forks [--forkcnt];
2236 ((W)forks [active - 1])->active = active;
2237 }
2238
2239 ev_stop (EV_A_ (W)w);
2240 }
2241 #endif
2242
2243 /*****************************************************************************/
2244
2245 struct ev_once
2246 {
2247 ev_io io;
2248 ev_timer to;
2249 void (*cb)(int revents, void *arg);
2250 void *arg;
2251 };
2252
2253 static void
2254 once_cb (EV_P_ struct ev_once *once, int revents)
2255 {
2256 void (*cb)(int revents, void *arg) = once->cb;
2257 void *arg = once->arg;
2258
2259 ev_io_stop (EV_A_ &once->io);
2260 ev_timer_stop (EV_A_ &once->to);
2261 ev_free (once);
2262
2263 cb (revents, arg);
2264 }
2265
2266 static void
2267 once_cb_io (EV_P_ ev_io *w, int revents)
2268 {
2269 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2270 }
2271
2272 static void
2273 once_cb_to (EV_P_ ev_timer *w, int revents)
2274 {
2275 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2276 }
2277
2278 void
2279 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2280 {
2281 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2282
2283 if (expect_false (!once))
2284 {
2285 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2286 return;
2287 }
2288
2289 once->cb = cb;
2290 once->arg = arg;
2291
2292 ev_init (&once->io, once_cb_io);
2293 if (fd >= 0)
2294 {
2295 ev_io_set (&once->io, fd, events);
2296 ev_io_start (EV_A_ &once->io);
2297 }
2298
2299 ev_init (&once->to, once_cb_to);
2300 if (timeout >= 0.)
2301 {
2302 ev_timer_set (&once->to, timeout, 0.);
2303 ev_timer_start (EV_A_ &once->to);
2304 }
2305 }
2306
2307 #ifdef __cplusplus
2308 }
2309 #endif
2310