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Revision: 1.248
Committed: Wed May 21 23:25:21 2008 UTC (16 years, 2 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.247: +232 -75 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 /* this big block deduces configuration from config.h */
45 #ifndef EV_STANDALONE
46 # ifdef EV_CONFIG_H
47 # include EV_CONFIG_H
48 # else
49 # include "config.h"
50 # endif
51
52 # if HAVE_CLOCK_GETTIME
53 # ifndef EV_USE_MONOTONIC
54 # define EV_USE_MONOTONIC 1
55 # endif
56 # ifndef EV_USE_REALTIME
57 # define EV_USE_REALTIME 1
58 # endif
59 # else
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 0
62 # endif
63 # ifndef EV_USE_REALTIME
64 # define EV_USE_REALTIME 0
65 # endif
66 # endif
67
68 # ifndef EV_USE_NANOSLEEP
69 # if HAVE_NANOSLEEP
70 # define EV_USE_NANOSLEEP 1
71 # else
72 # define EV_USE_NANOSLEEP 0
73 # endif
74 # endif
75
76 # ifndef EV_USE_SELECT
77 # if HAVE_SELECT && HAVE_SYS_SELECT_H
78 # define EV_USE_SELECT 1
79 # else
80 # define EV_USE_SELECT 0
81 # endif
82 # endif
83
84 # ifndef EV_USE_POLL
85 # if HAVE_POLL && HAVE_POLL_H
86 # define EV_USE_POLL 1
87 # else
88 # define EV_USE_POLL 0
89 # endif
90 # endif
91
92 # ifndef EV_USE_EPOLL
93 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
94 # define EV_USE_EPOLL 1
95 # else
96 # define EV_USE_EPOLL 0
97 # endif
98 # endif
99
100 # ifndef EV_USE_KQUEUE
101 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
102 # define EV_USE_KQUEUE 1
103 # else
104 # define EV_USE_KQUEUE 0
105 # endif
106 # endif
107
108 # ifndef EV_USE_PORT
109 # if HAVE_PORT_H && HAVE_PORT_CREATE
110 # define EV_USE_PORT 1
111 # else
112 # define EV_USE_PORT 0
113 # endif
114 # endif
115
116 # ifndef EV_USE_INOTIFY
117 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
118 # define EV_USE_INOTIFY 1
119 # else
120 # define EV_USE_INOTIFY 0
121 # endif
122 # endif
123
124 # ifndef EV_USE_EVENTFD
125 # if HAVE_EVENTFD
126 # define EV_USE_EVENTFD 1
127 # else
128 # define EV_USE_EVENTFD 0
129 # endif
130 # endif
131
132 #endif
133
134 #include <math.h>
135 #include <stdlib.h>
136 #include <fcntl.h>
137 #include <stddef.h>
138
139 #include <stdio.h>
140
141 #include <assert.h>
142 #include <errno.h>
143 #include <sys/types.h>
144 #include <time.h>
145
146 #include <signal.h>
147
148 #ifdef EV_H
149 # include EV_H
150 #else
151 # include "ev.h"
152 #endif
153
154 #ifndef _WIN32
155 # include <sys/time.h>
156 # include <sys/wait.h>
157 # include <unistd.h>
158 #else
159 # define WIN32_LEAN_AND_MEAN
160 # include <windows.h>
161 # ifndef EV_SELECT_IS_WINSOCKET
162 # define EV_SELECT_IS_WINSOCKET 1
163 # endif
164 #endif
165
166 /* this block tries to deduce configuration from header-defined symbols and defaults */
167
168 #ifndef EV_USE_MONOTONIC
169 # define EV_USE_MONOTONIC 0
170 #endif
171
172 #ifndef EV_USE_REALTIME
173 # define EV_USE_REALTIME 0
174 #endif
175
176 #ifndef EV_USE_NANOSLEEP
177 # define EV_USE_NANOSLEEP 0
178 #endif
179
180 #ifndef EV_USE_SELECT
181 # define EV_USE_SELECT 1
182 #endif
183
184 #ifndef EV_USE_POLL
185 # ifdef _WIN32
186 # define EV_USE_POLL 0
187 # else
188 # define EV_USE_POLL 1
189 # endif
190 #endif
191
192 #ifndef EV_USE_EPOLL
193 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
194 # define EV_USE_EPOLL 1
195 # else
196 # define EV_USE_EPOLL 0
197 # endif
198 #endif
199
200 #ifndef EV_USE_KQUEUE
201 # define EV_USE_KQUEUE 0
202 #endif
203
204 #ifndef EV_USE_PORT
205 # define EV_USE_PORT 0
206 #endif
207
208 #ifndef EV_USE_INOTIFY
209 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
210 # define EV_USE_INOTIFY 1
211 # else
212 # define EV_USE_INOTIFY 0
213 # endif
214 #endif
215
216 #ifndef EV_PID_HASHSIZE
217 # if EV_MINIMAL
218 # define EV_PID_HASHSIZE 1
219 # else
220 # define EV_PID_HASHSIZE 16
221 # endif
222 #endif
223
224 #ifndef EV_INOTIFY_HASHSIZE
225 # if EV_MINIMAL
226 # define EV_INOTIFY_HASHSIZE 1
227 # else
228 # define EV_INOTIFY_HASHSIZE 16
229 # endif
230 #endif
231
232 #ifndef EV_USE_EVENTFD
233 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
234 # define EV_USE_EVENTFD 1
235 # else
236 # define EV_USE_EVENTFD 0
237 # endif
238 #endif
239
240 #ifndef EV_USE_4HEAP
241 # define EV_USE_4HEAP !EV_MINIMAL
242 #endif
243
244 #ifndef EV_HEAP_CACHE_AT
245 # define EV_HEAP_CACHE_AT !EV_MINIMAL
246 #endif
247
248 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
249
250 #ifndef CLOCK_MONOTONIC
251 # undef EV_USE_MONOTONIC
252 # define EV_USE_MONOTONIC 0
253 #endif
254
255 #ifndef CLOCK_REALTIME
256 # undef EV_USE_REALTIME
257 # define EV_USE_REALTIME 0
258 #endif
259
260 #if !EV_STAT_ENABLE
261 # undef EV_USE_INOTIFY
262 # define EV_USE_INOTIFY 0
263 #endif
264
265 #if !EV_USE_NANOSLEEP
266 # ifndef _WIN32
267 # include <sys/select.h>
268 # endif
269 #endif
270
271 #if EV_USE_INOTIFY
272 # include <sys/inotify.h>
273 #endif
274
275 #if EV_SELECT_IS_WINSOCKET
276 # include <winsock.h>
277 #endif
278
279 #if EV_USE_EVENTFD
280 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
281 # include <stdint.h>
282 # ifdef __cplusplus
283 extern "C" {
284 # endif
285 int eventfd (unsigned int initval, int flags);
286 # ifdef __cplusplus
287 }
288 # endif
289 #endif
290
291 /**/
292
293 /* undefined or zero: no verification done or available */
294 /* 1 or higher: ev_loop_verify function available */
295 /* 2 or higher: ev_loop_verify is called frequently */
296 #define EV_VERIFY 1
297
298 #if EV_VERIFY > 1
299 # define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
300 #else
301 # define EV_FREQUENT_CHECK do { } while (0)
302 #endif
303
304 /*
305 * This is used to avoid floating point rounding problems.
306 * It is added to ev_rt_now when scheduling periodics
307 * to ensure progress, time-wise, even when rounding
308 * errors are against us.
309 * This value is good at least till the year 4000.
310 * Better solutions welcome.
311 */
312 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
313
314 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
315 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
316 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
317
318 #if __GNUC__ >= 4
319 # define expect(expr,value) __builtin_expect ((expr),(value))
320 # define noinline __attribute__ ((noinline))
321 #else
322 # define expect(expr,value) (expr)
323 # define noinline
324 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
325 # define inline
326 # endif
327 #endif
328
329 #define expect_false(expr) expect ((expr) != 0, 0)
330 #define expect_true(expr) expect ((expr) != 0, 1)
331 #define inline_size static inline
332
333 #if EV_MINIMAL
334 # define inline_speed static noinline
335 #else
336 # define inline_speed static inline
337 #endif
338
339 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
340 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
341
342 #define EMPTY /* required for microsofts broken pseudo-c compiler */
343 #define EMPTY2(a,b) /* used to suppress some warnings */
344
345 typedef ev_watcher *W;
346 typedef ev_watcher_list *WL;
347 typedef ev_watcher_time *WT;
348
349 #define ev_active(w) ((W)(w))->active
350 #define ev_at(w) ((WT)(w))->at
351
352 #if EV_USE_MONOTONIC
353 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
354 /* giving it a reasonably high chance of working on typical architetcures */
355 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
356 #endif
357
358 #ifdef _WIN32
359 # include "ev_win32.c"
360 #endif
361
362 /*****************************************************************************/
363
364 static void (*syserr_cb)(const char *msg);
365
366 void
367 ev_set_syserr_cb (void (*cb)(const char *msg))
368 {
369 syserr_cb = cb;
370 }
371
372 static void noinline
373 syserr (const char *msg)
374 {
375 if (!msg)
376 msg = "(libev) system error";
377
378 if (syserr_cb)
379 syserr_cb (msg);
380 else
381 {
382 perror (msg);
383 abort ();
384 }
385 }
386
387 static void *
388 ev_realloc_emul (void *ptr, long size)
389 {
390 /* some systems, notably openbsd and darwin, fail to properly
391 * implement realloc (x, 0) (as required by both ansi c-98 and
392 * the single unix specification, so work around them here.
393 */
394
395 if (size)
396 return realloc (ptr, size);
397
398 free (ptr);
399 return 0;
400 }
401
402 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
403
404 void
405 ev_set_allocator (void *(*cb)(void *ptr, long size))
406 {
407 alloc = cb;
408 }
409
410 inline_speed void *
411 ev_realloc (void *ptr, long size)
412 {
413 ptr = alloc (ptr, size);
414
415 if (!ptr && size)
416 {
417 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
418 abort ();
419 }
420
421 return ptr;
422 }
423
424 #define ev_malloc(size) ev_realloc (0, (size))
425 #define ev_free(ptr) ev_realloc ((ptr), 0)
426
427 /*****************************************************************************/
428
429 typedef struct
430 {
431 WL head;
432 unsigned char events;
433 unsigned char reify;
434 #if EV_SELECT_IS_WINSOCKET
435 SOCKET handle;
436 #endif
437 } ANFD;
438
439 typedef struct
440 {
441 W w;
442 int events;
443 } ANPENDING;
444
445 #if EV_USE_INOTIFY
446 /* hash table entry per inotify-id */
447 typedef struct
448 {
449 WL head;
450 } ANFS;
451 #endif
452
453 /* Heap Entry */
454 #if EV_HEAP_CACHE_AT
455 typedef struct {
456 ev_tstamp at;
457 WT w;
458 } ANHE;
459
460 #define ANHE_w(he) (he).w /* access watcher, read-write */
461 #define ANHE_at(he) (he).at /* access cached at, read-only */
462 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
463 #else
464 typedef WT ANHE;
465
466 #define ANHE_w(he) (he)
467 #define ANHE_at(he) (he)->at
468 #define ANHE_at_cache(he)
469 #endif
470
471 #if EV_MULTIPLICITY
472
473 struct ev_loop
474 {
475 ev_tstamp ev_rt_now;
476 #define ev_rt_now ((loop)->ev_rt_now)
477 #define VAR(name,decl) decl;
478 #include "ev_vars.h"
479 #undef VAR
480 };
481 #include "ev_wrap.h"
482
483 static struct ev_loop default_loop_struct;
484 struct ev_loop *ev_default_loop_ptr;
485
486 #else
487
488 ev_tstamp ev_rt_now;
489 #define VAR(name,decl) static decl;
490 #include "ev_vars.h"
491 #undef VAR
492
493 static int ev_default_loop_ptr;
494
495 #endif
496
497 /*****************************************************************************/
498
499 ev_tstamp
500 ev_time (void)
501 {
502 #if EV_USE_REALTIME
503 struct timespec ts;
504 clock_gettime (CLOCK_REALTIME, &ts);
505 return ts.tv_sec + ts.tv_nsec * 1e-9;
506 #else
507 struct timeval tv;
508 gettimeofday (&tv, 0);
509 return tv.tv_sec + tv.tv_usec * 1e-6;
510 #endif
511 }
512
513 ev_tstamp inline_size
514 get_clock (void)
515 {
516 #if EV_USE_MONOTONIC
517 if (expect_true (have_monotonic))
518 {
519 struct timespec ts;
520 clock_gettime (CLOCK_MONOTONIC, &ts);
521 return ts.tv_sec + ts.tv_nsec * 1e-9;
522 }
523 #endif
524
525 return ev_time ();
526 }
527
528 #if EV_MULTIPLICITY
529 ev_tstamp
530 ev_now (EV_P)
531 {
532 return ev_rt_now;
533 }
534 #endif
535
536 void
537 ev_sleep (ev_tstamp delay)
538 {
539 if (delay > 0.)
540 {
541 #if EV_USE_NANOSLEEP
542 struct timespec ts;
543
544 ts.tv_sec = (time_t)delay;
545 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
546
547 nanosleep (&ts, 0);
548 #elif defined(_WIN32)
549 Sleep ((unsigned long)(delay * 1e3));
550 #else
551 struct timeval tv;
552
553 tv.tv_sec = (time_t)delay;
554 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
555
556 select (0, 0, 0, 0, &tv);
557 #endif
558 }
559 }
560
561 /*****************************************************************************/
562
563 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
564
565 int inline_size
566 array_nextsize (int elem, int cur, int cnt)
567 {
568 int ncur = cur + 1;
569
570 do
571 ncur <<= 1;
572 while (cnt > ncur);
573
574 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
575 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
576 {
577 ncur *= elem;
578 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
579 ncur = ncur - sizeof (void *) * 4;
580 ncur /= elem;
581 }
582
583 return ncur;
584 }
585
586 static noinline void *
587 array_realloc (int elem, void *base, int *cur, int cnt)
588 {
589 *cur = array_nextsize (elem, *cur, cnt);
590 return ev_realloc (base, elem * *cur);
591 }
592
593 #define array_needsize(type,base,cur,cnt,init) \
594 if (expect_false ((cnt) > (cur))) \
595 { \
596 int ocur_ = (cur); \
597 (base) = (type *)array_realloc \
598 (sizeof (type), (base), &(cur), (cnt)); \
599 init ((base) + (ocur_), (cur) - ocur_); \
600 }
601
602 #if 0
603 #define array_slim(type,stem) \
604 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
605 { \
606 stem ## max = array_roundsize (stem ## cnt >> 1); \
607 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
608 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
609 }
610 #endif
611
612 #define array_free(stem, idx) \
613 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
614
615 /*****************************************************************************/
616
617 void noinline
618 ev_feed_event (EV_P_ void *w, int revents)
619 {
620 W w_ = (W)w;
621 int pri = ABSPRI (w_);
622
623 if (expect_false (w_->pending))
624 pendings [pri][w_->pending - 1].events |= revents;
625 else
626 {
627 w_->pending = ++pendingcnt [pri];
628 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
629 pendings [pri][w_->pending - 1].w = w_;
630 pendings [pri][w_->pending - 1].events = revents;
631 }
632 }
633
634 void inline_speed
635 queue_events (EV_P_ W *events, int eventcnt, int type)
636 {
637 int i;
638
639 for (i = 0; i < eventcnt; ++i)
640 ev_feed_event (EV_A_ events [i], type);
641 }
642
643 /*****************************************************************************/
644
645 void inline_size
646 anfds_init (ANFD *base, int count)
647 {
648 while (count--)
649 {
650 base->head = 0;
651 base->events = EV_NONE;
652 base->reify = 0;
653
654 ++base;
655 }
656 }
657
658 void inline_speed
659 fd_event (EV_P_ int fd, int revents)
660 {
661 ANFD *anfd = anfds + fd;
662 ev_io *w;
663
664 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
665 {
666 int ev = w->events & revents;
667
668 if (ev)
669 ev_feed_event (EV_A_ (W)w, ev);
670 }
671 }
672
673 void
674 ev_feed_fd_event (EV_P_ int fd, int revents)
675 {
676 if (fd >= 0 && fd < anfdmax)
677 fd_event (EV_A_ fd, revents);
678 }
679
680 void inline_size
681 fd_reify (EV_P)
682 {
683 int i;
684
685 for (i = 0; i < fdchangecnt; ++i)
686 {
687 int fd = fdchanges [i];
688 ANFD *anfd = anfds + fd;
689 ev_io *w;
690
691 unsigned char events = 0;
692
693 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
694 events |= (unsigned char)w->events;
695
696 #if EV_SELECT_IS_WINSOCKET
697 if (events)
698 {
699 unsigned long argp;
700 #ifdef EV_FD_TO_WIN32_HANDLE
701 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
702 #else
703 anfd->handle = _get_osfhandle (fd);
704 #endif
705 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
706 }
707 #endif
708
709 {
710 unsigned char o_events = anfd->events;
711 unsigned char o_reify = anfd->reify;
712
713 anfd->reify = 0;
714 anfd->events = events;
715
716 if (o_events != events || o_reify & EV_IOFDSET)
717 backend_modify (EV_A_ fd, o_events, events);
718 }
719 }
720
721 fdchangecnt = 0;
722 }
723
724 void inline_size
725 fd_change (EV_P_ int fd, int flags)
726 {
727 unsigned char reify = anfds [fd].reify;
728 anfds [fd].reify |= flags;
729
730 if (expect_true (!reify))
731 {
732 ++fdchangecnt;
733 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
734 fdchanges [fdchangecnt - 1] = fd;
735 }
736 }
737
738 void inline_speed
739 fd_kill (EV_P_ int fd)
740 {
741 ev_io *w;
742
743 while ((w = (ev_io *)anfds [fd].head))
744 {
745 ev_io_stop (EV_A_ w);
746 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
747 }
748 }
749
750 int inline_size
751 fd_valid (int fd)
752 {
753 #ifdef _WIN32
754 return _get_osfhandle (fd) != -1;
755 #else
756 return fcntl (fd, F_GETFD) != -1;
757 #endif
758 }
759
760 /* called on EBADF to verify fds */
761 static void noinline
762 fd_ebadf (EV_P)
763 {
764 int fd;
765
766 for (fd = 0; fd < anfdmax; ++fd)
767 if (anfds [fd].events)
768 if (!fd_valid (fd) == -1 && errno == EBADF)
769 fd_kill (EV_A_ fd);
770 }
771
772 /* called on ENOMEM in select/poll to kill some fds and retry */
773 static void noinline
774 fd_enomem (EV_P)
775 {
776 int fd;
777
778 for (fd = anfdmax; fd--; )
779 if (anfds [fd].events)
780 {
781 fd_kill (EV_A_ fd);
782 return;
783 }
784 }
785
786 /* usually called after fork if backend needs to re-arm all fds from scratch */
787 static void noinline
788 fd_rearm_all (EV_P)
789 {
790 int fd;
791
792 for (fd = 0; fd < anfdmax; ++fd)
793 if (anfds [fd].events)
794 {
795 anfds [fd].events = 0;
796 fd_change (EV_A_ fd, EV_IOFDSET | 1);
797 }
798 }
799
800 /*****************************************************************************/
801
802 /*
803 * the heap functions want a real array index. array index 0 uis guaranteed to not
804 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
805 * the branching factor of the d-tree.
806 */
807
808 /*
809 * at the moment we allow libev the luxury of two heaps,
810 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
811 * which is more cache-efficient.
812 * the difference is about 5% with 50000+ watchers.
813 */
814 #if EV_USE_4HEAP
815
816 #define DHEAP 4
817 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
818 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
819 #define UPHEAP_DONE(p,k) ((p) == (k))
820
821 /* away from the root */
822 void inline_speed
823 downheap (ANHE *heap, int N, int k)
824 {
825 ANHE he = heap [k];
826 ANHE *E = heap + N + HEAP0;
827
828 for (;;)
829 {
830 ev_tstamp minat;
831 ANHE *minpos;
832 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
833
834 /* find minimum child */
835 if (expect_true (pos + DHEAP - 1 < E))
836 {
837 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
838 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
839 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
840 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
841 }
842 else if (pos < E)
843 {
844 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
845 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
846 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
847 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
848 }
849 else
850 break;
851
852 if (ANHE_at (he) <= minat)
853 break;
854
855 heap [k] = *minpos;
856 ev_active (ANHE_w (*minpos)) = k;
857
858 k = minpos - heap;
859 }
860
861 heap [k] = he;
862 ev_active (ANHE_w (he)) = k;
863 }
864
865 #else /* 4HEAP */
866
867 #define HEAP0 1
868 #define HPARENT(k) ((k) >> 1)
869 #define UPHEAP_DONE(p,k) (!(p))
870
871 /* away from the root */
872 void inline_speed
873 downheap (ANHE *heap, int N, int k)
874 {
875 ANHE he = heap [k];
876
877 for (;;)
878 {
879 int c = k << 1;
880
881 if (c > N + HEAP0 - 1)
882 break;
883
884 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
885 ? 1 : 0;
886
887 if (ANHE_at (he) <= ANHE_at (heap [c]))
888 break;
889
890 heap [k] = heap [c];
891 ev_active (ANHE_w (heap [k])) = k;
892
893 k = c;
894 }
895
896 heap [k] = he;
897 ev_active (ANHE_w (he)) = k;
898 }
899 #endif
900
901 /* towards the root */
902 void inline_speed
903 upheap (ANHE *heap, int k)
904 {
905 ANHE he = heap [k];
906
907 for (;;)
908 {
909 int p = HPARENT (k);
910
911 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
912 break;
913
914 heap [k] = heap [p];
915 ev_active (ANHE_w (heap [k])) = k;
916 k = p;
917 }
918
919 heap [k] = he;
920 ev_active (ANHE_w (he)) = k;
921 }
922
923 void inline_size
924 adjustheap (ANHE *heap, int N, int k)
925 {
926 if (k > HEAP0 && ANHE_at (heap [HPARENT (k)]) >= ANHE_at (heap [k]))
927 upheap (heap, k);
928 else
929 downheap (heap, N, k);
930 }
931
932 /* rebuild the heap: this function is used only once and executed rarely */
933 void inline_size
934 reheap (ANHE *heap, int N)
935 {
936 int i;
937 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
938 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
939 for (i = 0; i < N; ++i)
940 upheap (heap, i + HEAP0);
941 }
942
943 #if EV_VERIFY
944 static void
945 checkheap (ANHE *heap, int N)
946 {
947 int i;
948
949 for (i = HEAP0; i < N + HEAP0; ++i)
950 {
951 assert (("active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
952 assert (("heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
953 assert (("heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
954 }
955 }
956 #endif
957
958 /*****************************************************************************/
959
960 typedef struct
961 {
962 WL head;
963 EV_ATOMIC_T gotsig;
964 } ANSIG;
965
966 static ANSIG *signals;
967 static int signalmax;
968
969 static EV_ATOMIC_T gotsig;
970
971 void inline_size
972 signals_init (ANSIG *base, int count)
973 {
974 while (count--)
975 {
976 base->head = 0;
977 base->gotsig = 0;
978
979 ++base;
980 }
981 }
982
983 /*****************************************************************************/
984
985 void inline_speed
986 fd_intern (int fd)
987 {
988 #ifdef _WIN32
989 int arg = 1;
990 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
991 #else
992 fcntl (fd, F_SETFD, FD_CLOEXEC);
993 fcntl (fd, F_SETFL, O_NONBLOCK);
994 #endif
995 }
996
997 static void noinline
998 evpipe_init (EV_P)
999 {
1000 if (!ev_is_active (&pipeev))
1001 {
1002 #if EV_USE_EVENTFD
1003 if ((evfd = eventfd (0, 0)) >= 0)
1004 {
1005 evpipe [0] = -1;
1006 fd_intern (evfd);
1007 ev_io_set (&pipeev, evfd, EV_READ);
1008 }
1009 else
1010 #endif
1011 {
1012 while (pipe (evpipe))
1013 syserr ("(libev) error creating signal/async pipe");
1014
1015 fd_intern (evpipe [0]);
1016 fd_intern (evpipe [1]);
1017 ev_io_set (&pipeev, evpipe [0], EV_READ);
1018 }
1019
1020 ev_io_start (EV_A_ &pipeev);
1021 ev_unref (EV_A); /* watcher should not keep loop alive */
1022 }
1023 }
1024
1025 void inline_size
1026 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1027 {
1028 if (!*flag)
1029 {
1030 int old_errno = errno; /* save errno because write might clobber it */
1031
1032 *flag = 1;
1033
1034 #if EV_USE_EVENTFD
1035 if (evfd >= 0)
1036 {
1037 uint64_t counter = 1;
1038 write (evfd, &counter, sizeof (uint64_t));
1039 }
1040 else
1041 #endif
1042 write (evpipe [1], &old_errno, 1);
1043
1044 errno = old_errno;
1045 }
1046 }
1047
1048 static void
1049 pipecb (EV_P_ ev_io *iow, int revents)
1050 {
1051 #if EV_USE_EVENTFD
1052 if (evfd >= 0)
1053 {
1054 uint64_t counter;
1055 read (evfd, &counter, sizeof (uint64_t));
1056 }
1057 else
1058 #endif
1059 {
1060 char dummy;
1061 read (evpipe [0], &dummy, 1);
1062 }
1063
1064 if (gotsig && ev_is_default_loop (EV_A))
1065 {
1066 int signum;
1067 gotsig = 0;
1068
1069 for (signum = signalmax; signum--; )
1070 if (signals [signum].gotsig)
1071 ev_feed_signal_event (EV_A_ signum + 1);
1072 }
1073
1074 #if EV_ASYNC_ENABLE
1075 if (gotasync)
1076 {
1077 int i;
1078 gotasync = 0;
1079
1080 for (i = asynccnt; i--; )
1081 if (asyncs [i]->sent)
1082 {
1083 asyncs [i]->sent = 0;
1084 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1085 }
1086 }
1087 #endif
1088 }
1089
1090 /*****************************************************************************/
1091
1092 static void
1093 ev_sighandler (int signum)
1094 {
1095 #if EV_MULTIPLICITY
1096 struct ev_loop *loop = &default_loop_struct;
1097 #endif
1098
1099 #if _WIN32
1100 signal (signum, ev_sighandler);
1101 #endif
1102
1103 signals [signum - 1].gotsig = 1;
1104 evpipe_write (EV_A_ &gotsig);
1105 }
1106
1107 void noinline
1108 ev_feed_signal_event (EV_P_ int signum)
1109 {
1110 WL w;
1111
1112 #if EV_MULTIPLICITY
1113 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1114 #endif
1115
1116 --signum;
1117
1118 if (signum < 0 || signum >= signalmax)
1119 return;
1120
1121 signals [signum].gotsig = 0;
1122
1123 for (w = signals [signum].head; w; w = w->next)
1124 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1125 }
1126
1127 /*****************************************************************************/
1128
1129 static WL childs [EV_PID_HASHSIZE];
1130
1131 #ifndef _WIN32
1132
1133 static ev_signal childev;
1134
1135 #ifndef WIFCONTINUED
1136 # define WIFCONTINUED(status) 0
1137 #endif
1138
1139 void inline_speed
1140 child_reap (EV_P_ int chain, int pid, int status)
1141 {
1142 ev_child *w;
1143 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1144
1145 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1146 {
1147 if ((w->pid == pid || !w->pid)
1148 && (!traced || (w->flags & 1)))
1149 {
1150 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1151 w->rpid = pid;
1152 w->rstatus = status;
1153 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1154 }
1155 }
1156 }
1157
1158 #ifndef WCONTINUED
1159 # define WCONTINUED 0
1160 #endif
1161
1162 static void
1163 childcb (EV_P_ ev_signal *sw, int revents)
1164 {
1165 int pid, status;
1166
1167 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1168 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1169 if (!WCONTINUED
1170 || errno != EINVAL
1171 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1172 return;
1173
1174 /* make sure we are called again until all children have been reaped */
1175 /* we need to do it this way so that the callback gets called before we continue */
1176 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1177
1178 child_reap (EV_A_ pid, pid, status);
1179 if (EV_PID_HASHSIZE > 1)
1180 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1181 }
1182
1183 #endif
1184
1185 /*****************************************************************************/
1186
1187 #if EV_USE_PORT
1188 # include "ev_port.c"
1189 #endif
1190 #if EV_USE_KQUEUE
1191 # include "ev_kqueue.c"
1192 #endif
1193 #if EV_USE_EPOLL
1194 # include "ev_epoll.c"
1195 #endif
1196 #if EV_USE_POLL
1197 # include "ev_poll.c"
1198 #endif
1199 #if EV_USE_SELECT
1200 # include "ev_select.c"
1201 #endif
1202
1203 int
1204 ev_version_major (void)
1205 {
1206 return EV_VERSION_MAJOR;
1207 }
1208
1209 int
1210 ev_version_minor (void)
1211 {
1212 return EV_VERSION_MINOR;
1213 }
1214
1215 /* return true if we are running with elevated privileges and should ignore env variables */
1216 int inline_size
1217 enable_secure (void)
1218 {
1219 #ifdef _WIN32
1220 return 0;
1221 #else
1222 return getuid () != geteuid ()
1223 || getgid () != getegid ();
1224 #endif
1225 }
1226
1227 unsigned int
1228 ev_supported_backends (void)
1229 {
1230 unsigned int flags = 0;
1231
1232 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1233 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1234 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1235 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1236 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1237
1238 return flags;
1239 }
1240
1241 unsigned int
1242 ev_recommended_backends (void)
1243 {
1244 unsigned int flags = ev_supported_backends ();
1245
1246 #ifndef __NetBSD__
1247 /* kqueue is borked on everything but netbsd apparently */
1248 /* it usually doesn't work correctly on anything but sockets and pipes */
1249 flags &= ~EVBACKEND_KQUEUE;
1250 #endif
1251 #ifdef __APPLE__
1252 // flags &= ~EVBACKEND_KQUEUE; for documentation
1253 flags &= ~EVBACKEND_POLL;
1254 #endif
1255
1256 return flags;
1257 }
1258
1259 unsigned int
1260 ev_embeddable_backends (void)
1261 {
1262 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1263
1264 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1265 /* please fix it and tell me how to detect the fix */
1266 flags &= ~EVBACKEND_EPOLL;
1267
1268 return flags;
1269 }
1270
1271 unsigned int
1272 ev_backend (EV_P)
1273 {
1274 return backend;
1275 }
1276
1277 unsigned int
1278 ev_loop_count (EV_P)
1279 {
1280 return loop_count;
1281 }
1282
1283 void
1284 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1285 {
1286 io_blocktime = interval;
1287 }
1288
1289 void
1290 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1291 {
1292 timeout_blocktime = interval;
1293 }
1294
1295 static void noinline
1296 loop_init (EV_P_ unsigned int flags)
1297 {
1298 if (!backend)
1299 {
1300 #if EV_USE_MONOTONIC
1301 {
1302 struct timespec ts;
1303 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1304 have_monotonic = 1;
1305 }
1306 #endif
1307
1308 ev_rt_now = ev_time ();
1309 mn_now = get_clock ();
1310 now_floor = mn_now;
1311 rtmn_diff = ev_rt_now - mn_now;
1312
1313 io_blocktime = 0.;
1314 timeout_blocktime = 0.;
1315 backend = 0;
1316 backend_fd = -1;
1317 gotasync = 0;
1318 #if EV_USE_INOTIFY
1319 fs_fd = -2;
1320 #endif
1321
1322 /* pid check not overridable via env */
1323 #ifndef _WIN32
1324 if (flags & EVFLAG_FORKCHECK)
1325 curpid = getpid ();
1326 #endif
1327
1328 if (!(flags & EVFLAG_NOENV)
1329 && !enable_secure ()
1330 && getenv ("LIBEV_FLAGS"))
1331 flags = atoi (getenv ("LIBEV_FLAGS"));
1332
1333 if (!(flags & 0x0000ffffU))
1334 flags |= ev_recommended_backends ();
1335
1336 #if EV_USE_PORT
1337 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1338 #endif
1339 #if EV_USE_KQUEUE
1340 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1341 #endif
1342 #if EV_USE_EPOLL
1343 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1344 #endif
1345 #if EV_USE_POLL
1346 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1347 #endif
1348 #if EV_USE_SELECT
1349 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1350 #endif
1351
1352 ev_init (&pipeev, pipecb);
1353 ev_set_priority (&pipeev, EV_MAXPRI);
1354 }
1355 }
1356
1357 static void noinline
1358 loop_destroy (EV_P)
1359 {
1360 int i;
1361
1362 if (ev_is_active (&pipeev))
1363 {
1364 ev_ref (EV_A); /* signal watcher */
1365 ev_io_stop (EV_A_ &pipeev);
1366
1367 #if EV_USE_EVENTFD
1368 if (evfd >= 0)
1369 close (evfd);
1370 #endif
1371
1372 if (evpipe [0] >= 0)
1373 {
1374 close (evpipe [0]);
1375 close (evpipe [1]);
1376 }
1377 }
1378
1379 #if EV_USE_INOTIFY
1380 if (fs_fd >= 0)
1381 close (fs_fd);
1382 #endif
1383
1384 if (backend_fd >= 0)
1385 close (backend_fd);
1386
1387 #if EV_USE_PORT
1388 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1389 #endif
1390 #if EV_USE_KQUEUE
1391 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1392 #endif
1393 #if EV_USE_EPOLL
1394 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1395 #endif
1396 #if EV_USE_POLL
1397 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1398 #endif
1399 #if EV_USE_SELECT
1400 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1401 #endif
1402
1403 for (i = NUMPRI; i--; )
1404 {
1405 array_free (pending, [i]);
1406 #if EV_IDLE_ENABLE
1407 array_free (idle, [i]);
1408 #endif
1409 }
1410
1411 ev_free (anfds); anfdmax = 0;
1412
1413 /* have to use the microsoft-never-gets-it-right macro */
1414 array_free (fdchange, EMPTY);
1415 array_free (timer, EMPTY);
1416 #if EV_PERIODIC_ENABLE
1417 array_free (periodic, EMPTY);
1418 #endif
1419 #if EV_FORK_ENABLE
1420 array_free (fork, EMPTY);
1421 #endif
1422 array_free (prepare, EMPTY);
1423 array_free (check, EMPTY);
1424 #if EV_ASYNC_ENABLE
1425 array_free (async, EMPTY);
1426 #endif
1427
1428 backend = 0;
1429 }
1430
1431 #if EV_USE_INOTIFY
1432 void inline_size infy_fork (EV_P);
1433 #endif
1434
1435 void inline_size
1436 loop_fork (EV_P)
1437 {
1438 #if EV_USE_PORT
1439 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1440 #endif
1441 #if EV_USE_KQUEUE
1442 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1443 #endif
1444 #if EV_USE_EPOLL
1445 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1446 #endif
1447 #if EV_USE_INOTIFY
1448 infy_fork (EV_A);
1449 #endif
1450
1451 if (ev_is_active (&pipeev))
1452 {
1453 /* this "locks" the handlers against writing to the pipe */
1454 /* while we modify the fd vars */
1455 gotsig = 1;
1456 #if EV_ASYNC_ENABLE
1457 gotasync = 1;
1458 #endif
1459
1460 ev_ref (EV_A);
1461 ev_io_stop (EV_A_ &pipeev);
1462
1463 #if EV_USE_EVENTFD
1464 if (evfd >= 0)
1465 close (evfd);
1466 #endif
1467
1468 if (evpipe [0] >= 0)
1469 {
1470 close (evpipe [0]);
1471 close (evpipe [1]);
1472 }
1473
1474 evpipe_init (EV_A);
1475 /* now iterate over everything, in case we missed something */
1476 pipecb (EV_A_ &pipeev, EV_READ);
1477 }
1478
1479 postfork = 0;
1480 }
1481
1482 #if EV_MULTIPLICITY
1483 struct ev_loop *
1484 ev_loop_new (unsigned int flags)
1485 {
1486 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1487
1488 memset (loop, 0, sizeof (struct ev_loop));
1489
1490 loop_init (EV_A_ flags);
1491
1492 if (ev_backend (EV_A))
1493 return loop;
1494
1495 return 0;
1496 }
1497
1498 void
1499 ev_loop_destroy (EV_P)
1500 {
1501 loop_destroy (EV_A);
1502 ev_free (loop);
1503 }
1504
1505 void
1506 ev_loop_fork (EV_P)
1507 {
1508 postfork = 1; /* must be in line with ev_default_fork */
1509 }
1510
1511 #if EV_VERIFY
1512 static void
1513 array_check (W **ws, int cnt)
1514 {
1515 while (cnt--)
1516 assert (("active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1517 }
1518
1519 static void
1520 ev_loop_verify (EV_P)
1521 {
1522 int i;
1523
1524 checkheap (timers, timercnt);
1525 #if EV_PERIODIC_ENABLE
1526 checkheap (periodics, periodiccnt);
1527 #endif
1528
1529 #if EV_IDLE_ENABLE
1530 for (i = NUMPRI; i--; )
1531 array_check ((W **)idles [i], idlecnt [i]);
1532 #endif
1533 #if EV_FORK_ENABLE
1534 array_check ((W **)forks, forkcnt);
1535 #endif
1536 array_check ((W **)prepares, preparecnt);
1537 array_check ((W **)checks, checkcnt);
1538 #if EV_ASYNC_ENABLE
1539 array_check ((W **)asyncs, asynccnt);
1540 #endif
1541 }
1542 #endif
1543
1544 #endif
1545
1546 #if EV_MULTIPLICITY
1547 struct ev_loop *
1548 ev_default_loop_init (unsigned int flags)
1549 #else
1550 int
1551 ev_default_loop (unsigned int flags)
1552 #endif
1553 {
1554 if (!ev_default_loop_ptr)
1555 {
1556 #if EV_MULTIPLICITY
1557 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1558 #else
1559 ev_default_loop_ptr = 1;
1560 #endif
1561
1562 loop_init (EV_A_ flags);
1563
1564 if (ev_backend (EV_A))
1565 {
1566 #ifndef _WIN32
1567 ev_signal_init (&childev, childcb, SIGCHLD);
1568 ev_set_priority (&childev, EV_MAXPRI);
1569 ev_signal_start (EV_A_ &childev);
1570 ev_unref (EV_A); /* child watcher should not keep loop alive */
1571 #endif
1572 }
1573 else
1574 ev_default_loop_ptr = 0;
1575 }
1576
1577 return ev_default_loop_ptr;
1578 }
1579
1580 void
1581 ev_default_destroy (void)
1582 {
1583 #if EV_MULTIPLICITY
1584 struct ev_loop *loop = ev_default_loop_ptr;
1585 #endif
1586
1587 #ifndef _WIN32
1588 ev_ref (EV_A); /* child watcher */
1589 ev_signal_stop (EV_A_ &childev);
1590 #endif
1591
1592 loop_destroy (EV_A);
1593 }
1594
1595 void
1596 ev_default_fork (void)
1597 {
1598 #if EV_MULTIPLICITY
1599 struct ev_loop *loop = ev_default_loop_ptr;
1600 #endif
1601
1602 if (backend)
1603 postfork = 1; /* must be in line with ev_loop_fork */
1604 }
1605
1606 /*****************************************************************************/
1607
1608 void
1609 ev_invoke (EV_P_ void *w, int revents)
1610 {
1611 EV_CB_INVOKE ((W)w, revents);
1612 }
1613
1614 void inline_speed
1615 call_pending (EV_P)
1616 {
1617 int pri;
1618
1619 EV_FREQUENT_CHECK;
1620
1621 for (pri = NUMPRI; pri--; )
1622 while (pendingcnt [pri])
1623 {
1624 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1625
1626 if (expect_true (p->w))
1627 {
1628 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1629
1630 p->w->pending = 0;
1631 EV_CB_INVOKE (p->w, p->events);
1632 }
1633 }
1634
1635 EV_FREQUENT_CHECK;
1636 }
1637
1638 #if EV_IDLE_ENABLE
1639 void inline_size
1640 idle_reify (EV_P)
1641 {
1642 if (expect_false (idleall))
1643 {
1644 int pri;
1645
1646 for (pri = NUMPRI; pri--; )
1647 {
1648 if (pendingcnt [pri])
1649 break;
1650
1651 if (idlecnt [pri])
1652 {
1653 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1654 break;
1655 }
1656 }
1657 }
1658 }
1659 #endif
1660
1661 void inline_size
1662 timers_reify (EV_P)
1663 {
1664 EV_FREQUENT_CHECK;
1665
1666 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
1667 {
1668 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
1669
1670 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1671
1672 /* first reschedule or stop timer */
1673 if (w->repeat)
1674 {
1675 ev_at (w) += w->repeat;
1676 if (ev_at (w) < mn_now)
1677 ev_at (w) = mn_now;
1678
1679 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1680
1681 ANHE_at_cache (timers [HEAP0]);
1682 downheap (timers, timercnt, HEAP0);
1683 }
1684 else
1685 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1686
1687 EV_FREQUENT_CHECK;
1688 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1689 }
1690 }
1691
1692 #if EV_PERIODIC_ENABLE
1693 void inline_size
1694 periodics_reify (EV_P)
1695 {
1696 EV_FREQUENT_CHECK;
1697 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
1698 {
1699 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
1700
1701 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1702
1703 /* first reschedule or stop timer */
1704 if (w->reschedule_cb)
1705 {
1706 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1707
1708 assert (("ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
1709
1710 ANHE_at_cache (periodics [HEAP0]);
1711 downheap (periodics, periodiccnt, HEAP0);
1712 EV_FREQUENT_CHECK;
1713 }
1714 else if (w->interval)
1715 {
1716 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1717 /* if next trigger time is not sufficiently in the future, put it there */
1718 /* this might happen because of floating point inexactness */
1719 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
1720 {
1721 ev_at (w) += w->interval;
1722
1723 /* if interval is unreasonably low we might still have a time in the past */
1724 /* so correct this. this will make the periodic very inexact, but the user */
1725 /* has effectively asked to get triggered more often than possible */
1726 if (ev_at (w) < ev_rt_now)
1727 ev_at (w) = ev_rt_now;
1728 }
1729
1730 ANHE_at_cache (periodics [HEAP0]);
1731 downheap (periodics, periodiccnt, HEAP0);
1732 }
1733 else
1734 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1735
1736 EV_FREQUENT_CHECK;
1737 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1738 }
1739 }
1740
1741 static void noinline
1742 periodics_reschedule (EV_P)
1743 {
1744 int i;
1745
1746 /* adjust periodics after time jump */
1747 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
1748 {
1749 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
1750
1751 if (w->reschedule_cb)
1752 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1753 else if (w->interval)
1754 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1755
1756 ANHE_at_cache (periodics [i]);
1757 }
1758
1759 reheap (periodics, periodiccnt);
1760 }
1761 #endif
1762
1763 void inline_speed
1764 time_update (EV_P_ ev_tstamp max_block)
1765 {
1766 int i;
1767
1768 #if EV_USE_MONOTONIC
1769 if (expect_true (have_monotonic))
1770 {
1771 ev_tstamp odiff = rtmn_diff;
1772
1773 mn_now = get_clock ();
1774
1775 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1776 /* interpolate in the meantime */
1777 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1778 {
1779 ev_rt_now = rtmn_diff + mn_now;
1780 return;
1781 }
1782
1783 now_floor = mn_now;
1784 ev_rt_now = ev_time ();
1785
1786 /* loop a few times, before making important decisions.
1787 * on the choice of "4": one iteration isn't enough,
1788 * in case we get preempted during the calls to
1789 * ev_time and get_clock. a second call is almost guaranteed
1790 * to succeed in that case, though. and looping a few more times
1791 * doesn't hurt either as we only do this on time-jumps or
1792 * in the unlikely event of having been preempted here.
1793 */
1794 for (i = 4; --i; )
1795 {
1796 rtmn_diff = ev_rt_now - mn_now;
1797
1798 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
1799 return; /* all is well */
1800
1801 ev_rt_now = ev_time ();
1802 mn_now = get_clock ();
1803 now_floor = mn_now;
1804 }
1805
1806 # if EV_PERIODIC_ENABLE
1807 periodics_reschedule (EV_A);
1808 # endif
1809 /* no timer adjustment, as the monotonic clock doesn't jump */
1810 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1811 }
1812 else
1813 #endif
1814 {
1815 ev_rt_now = ev_time ();
1816
1817 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1818 {
1819 #if EV_PERIODIC_ENABLE
1820 periodics_reschedule (EV_A);
1821 #endif
1822 /* adjust timers. this is easy, as the offset is the same for all of them */
1823 for (i = 0; i < timercnt; ++i)
1824 {
1825 ANHE *he = timers + i + HEAP0;
1826 ANHE_w (*he)->at += ev_rt_now - mn_now;
1827 ANHE_at_cache (*he);
1828 }
1829 }
1830
1831 mn_now = ev_rt_now;
1832 }
1833 }
1834
1835 void
1836 ev_ref (EV_P)
1837 {
1838 ++activecnt;
1839 }
1840
1841 void
1842 ev_unref (EV_P)
1843 {
1844 --activecnt;
1845 }
1846
1847 static int loop_done;
1848
1849 void
1850 ev_loop (EV_P_ int flags)
1851 {
1852 loop_done = EVUNLOOP_CANCEL;
1853
1854 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1855
1856 do
1857 {
1858 #ifndef _WIN32
1859 if (expect_false (curpid)) /* penalise the forking check even more */
1860 if (expect_false (getpid () != curpid))
1861 {
1862 curpid = getpid ();
1863 postfork = 1;
1864 }
1865 #endif
1866
1867 #if EV_FORK_ENABLE
1868 /* we might have forked, so queue fork handlers */
1869 if (expect_false (postfork))
1870 if (forkcnt)
1871 {
1872 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1873 call_pending (EV_A);
1874 }
1875 #endif
1876
1877 /* queue prepare watchers (and execute them) */
1878 if (expect_false (preparecnt))
1879 {
1880 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1881 call_pending (EV_A);
1882 }
1883
1884 if (expect_false (!activecnt))
1885 break;
1886
1887 /* we might have forked, so reify kernel state if necessary */
1888 if (expect_false (postfork))
1889 loop_fork (EV_A);
1890
1891 /* update fd-related kernel structures */
1892 fd_reify (EV_A);
1893
1894 /* calculate blocking time */
1895 {
1896 ev_tstamp waittime = 0.;
1897 ev_tstamp sleeptime = 0.;
1898
1899 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1900 {
1901 /* update time to cancel out callback processing overhead */
1902 time_update (EV_A_ 1e100);
1903
1904 waittime = MAX_BLOCKTIME;
1905
1906 if (timercnt)
1907 {
1908 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
1909 if (waittime > to) waittime = to;
1910 }
1911
1912 #if EV_PERIODIC_ENABLE
1913 if (periodiccnt)
1914 {
1915 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
1916 if (waittime > to) waittime = to;
1917 }
1918 #endif
1919
1920 if (expect_false (waittime < timeout_blocktime))
1921 waittime = timeout_blocktime;
1922
1923 sleeptime = waittime - backend_fudge;
1924
1925 if (expect_true (sleeptime > io_blocktime))
1926 sleeptime = io_blocktime;
1927
1928 if (sleeptime)
1929 {
1930 ev_sleep (sleeptime);
1931 waittime -= sleeptime;
1932 }
1933 }
1934
1935 ++loop_count;
1936 backend_poll (EV_A_ waittime);
1937
1938 /* update ev_rt_now, do magic */
1939 time_update (EV_A_ waittime + sleeptime);
1940 }
1941
1942 /* queue pending timers and reschedule them */
1943 timers_reify (EV_A); /* relative timers called last */
1944 #if EV_PERIODIC_ENABLE
1945 periodics_reify (EV_A); /* absolute timers called first */
1946 #endif
1947
1948 #if EV_IDLE_ENABLE
1949 /* queue idle watchers unless other events are pending */
1950 idle_reify (EV_A);
1951 #endif
1952
1953 /* queue check watchers, to be executed first */
1954 if (expect_false (checkcnt))
1955 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1956
1957 call_pending (EV_A);
1958 }
1959 while (expect_true (
1960 activecnt
1961 && !loop_done
1962 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
1963 ));
1964
1965 if (loop_done == EVUNLOOP_ONE)
1966 loop_done = EVUNLOOP_CANCEL;
1967 }
1968
1969 void
1970 ev_unloop (EV_P_ int how)
1971 {
1972 loop_done = how;
1973 }
1974
1975 /*****************************************************************************/
1976
1977 void inline_size
1978 wlist_add (WL *head, WL elem)
1979 {
1980 elem->next = *head;
1981 *head = elem;
1982 }
1983
1984 void inline_size
1985 wlist_del (WL *head, WL elem)
1986 {
1987 while (*head)
1988 {
1989 if (*head == elem)
1990 {
1991 *head = elem->next;
1992 return;
1993 }
1994
1995 head = &(*head)->next;
1996 }
1997 }
1998
1999 void inline_speed
2000 clear_pending (EV_P_ W w)
2001 {
2002 if (w->pending)
2003 {
2004 pendings [ABSPRI (w)][w->pending - 1].w = 0;
2005 w->pending = 0;
2006 }
2007 }
2008
2009 int
2010 ev_clear_pending (EV_P_ void *w)
2011 {
2012 W w_ = (W)w;
2013 int pending = w_->pending;
2014
2015 if (expect_true (pending))
2016 {
2017 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2018 w_->pending = 0;
2019 p->w = 0;
2020 return p->events;
2021 }
2022 else
2023 return 0;
2024 }
2025
2026 void inline_size
2027 pri_adjust (EV_P_ W w)
2028 {
2029 int pri = w->priority;
2030 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2031 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2032 w->priority = pri;
2033 }
2034
2035 void inline_speed
2036 ev_start (EV_P_ W w, int active)
2037 {
2038 pri_adjust (EV_A_ w);
2039 w->active = active;
2040 ev_ref (EV_A);
2041 }
2042
2043 void inline_size
2044 ev_stop (EV_P_ W w)
2045 {
2046 ev_unref (EV_A);
2047 w->active = 0;
2048 }
2049
2050 /*****************************************************************************/
2051
2052 void noinline
2053 ev_io_start (EV_P_ ev_io *w)
2054 {
2055 int fd = w->fd;
2056
2057 if (expect_false (ev_is_active (w)))
2058 return;
2059
2060 assert (("ev_io_start called with negative fd", fd >= 0));
2061
2062 EV_FREQUENT_CHECK;
2063
2064 ev_start (EV_A_ (W)w, 1);
2065 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
2066 wlist_add (&anfds[fd].head, (WL)w);
2067
2068 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
2069 w->events &= ~EV_IOFDSET;
2070
2071 EV_FREQUENT_CHECK;
2072 }
2073
2074 void noinline
2075 ev_io_stop (EV_P_ ev_io *w)
2076 {
2077 clear_pending (EV_A_ (W)w);
2078 if (expect_false (!ev_is_active (w)))
2079 return;
2080
2081 assert (("ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2082
2083 EV_FREQUENT_CHECK;
2084
2085 wlist_del (&anfds[w->fd].head, (WL)w);
2086 ev_stop (EV_A_ (W)w);
2087
2088 fd_change (EV_A_ w->fd, 1);
2089
2090 EV_FREQUENT_CHECK;
2091 }
2092
2093 void noinline
2094 ev_timer_start (EV_P_ ev_timer *w)
2095 {
2096 if (expect_false (ev_is_active (w)))
2097 return;
2098
2099 ev_at (w) += mn_now;
2100
2101 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2102
2103 EV_FREQUENT_CHECK;
2104
2105 ++timercnt;
2106 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2107 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2108 ANHE_w (timers [ev_active (w)]) = (WT)w;
2109 ANHE_at_cache (timers [ev_active (w)]);
2110 upheap (timers, ev_active (w));
2111
2112 EV_FREQUENT_CHECK;
2113
2114 /*assert (("internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2115 }
2116
2117 void noinline
2118 ev_timer_stop (EV_P_ ev_timer *w)
2119 {
2120 clear_pending (EV_A_ (W)w);
2121 if (expect_false (!ev_is_active (w)))
2122 return;
2123
2124 EV_FREQUENT_CHECK;
2125
2126 {
2127 int active = ev_active (w);
2128
2129 assert (("internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2130
2131 --timercnt;
2132
2133 if (expect_true (active < timercnt + HEAP0))
2134 {
2135 timers [active] = timers [timercnt + HEAP0];
2136 adjustheap (timers, timercnt, active);
2137 }
2138 }
2139
2140 EV_FREQUENT_CHECK;
2141
2142 ev_at (w) -= mn_now;
2143
2144 ev_stop (EV_A_ (W)w);
2145 }
2146
2147 void noinline
2148 ev_timer_again (EV_P_ ev_timer *w)
2149 {
2150 EV_FREQUENT_CHECK;
2151
2152 if (ev_is_active (w))
2153 {
2154 if (w->repeat)
2155 {
2156 ev_at (w) = mn_now + w->repeat;
2157 ANHE_at_cache (timers [ev_active (w)]);
2158 adjustheap (timers, timercnt, ev_active (w));
2159 }
2160 else
2161 ev_timer_stop (EV_A_ w);
2162 }
2163 else if (w->repeat)
2164 {
2165 ev_at (w) = w->repeat;
2166 ev_timer_start (EV_A_ w);
2167 }
2168
2169 EV_FREQUENT_CHECK;
2170 }
2171
2172 #if EV_PERIODIC_ENABLE
2173 void noinline
2174 ev_periodic_start (EV_P_ ev_periodic *w)
2175 {
2176 if (expect_false (ev_is_active (w)))
2177 return;
2178
2179 if (w->reschedule_cb)
2180 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2181 else if (w->interval)
2182 {
2183 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
2184 /* this formula differs from the one in periodic_reify because we do not always round up */
2185 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2186 }
2187 else
2188 ev_at (w) = w->offset;
2189
2190 EV_FREQUENT_CHECK;
2191
2192 ++periodiccnt;
2193 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2194 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2195 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2196 ANHE_at_cache (periodics [ev_active (w)]);
2197 upheap (periodics, ev_active (w));
2198
2199 EV_FREQUENT_CHECK;
2200
2201 /*assert (("internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2202 }
2203
2204 void noinline
2205 ev_periodic_stop (EV_P_ ev_periodic *w)
2206 {
2207 clear_pending (EV_A_ (W)w);
2208 if (expect_false (!ev_is_active (w)))
2209 return;
2210
2211 EV_FREQUENT_CHECK;
2212
2213 {
2214 int active = ev_active (w);
2215
2216 assert (("internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2217
2218 --periodiccnt;
2219
2220 if (expect_true (active < periodiccnt + HEAP0))
2221 {
2222 periodics [active] = periodics [periodiccnt + HEAP0];
2223 adjustheap (periodics, periodiccnt, active);
2224 }
2225 }
2226
2227 EV_FREQUENT_CHECK;
2228
2229 ev_stop (EV_A_ (W)w);
2230 }
2231
2232 void noinline
2233 ev_periodic_again (EV_P_ ev_periodic *w)
2234 {
2235 /* TODO: use adjustheap and recalculation */
2236 ev_periodic_stop (EV_A_ w);
2237 ev_periodic_start (EV_A_ w);
2238 }
2239 #endif
2240
2241 #ifndef SA_RESTART
2242 # define SA_RESTART 0
2243 #endif
2244
2245 void noinline
2246 ev_signal_start (EV_P_ ev_signal *w)
2247 {
2248 #if EV_MULTIPLICITY
2249 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2250 #endif
2251 if (expect_false (ev_is_active (w)))
2252 return;
2253
2254 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2255
2256 evpipe_init (EV_A);
2257
2258 EV_FREQUENT_CHECK;
2259
2260 {
2261 #ifndef _WIN32
2262 sigset_t full, prev;
2263 sigfillset (&full);
2264 sigprocmask (SIG_SETMASK, &full, &prev);
2265 #endif
2266
2267 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2268
2269 #ifndef _WIN32
2270 sigprocmask (SIG_SETMASK, &prev, 0);
2271 #endif
2272 }
2273
2274 ev_start (EV_A_ (W)w, 1);
2275 wlist_add (&signals [w->signum - 1].head, (WL)w);
2276
2277 if (!((WL)w)->next)
2278 {
2279 #if _WIN32
2280 signal (w->signum, ev_sighandler);
2281 #else
2282 struct sigaction sa;
2283 sa.sa_handler = ev_sighandler;
2284 sigfillset (&sa.sa_mask);
2285 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2286 sigaction (w->signum, &sa, 0);
2287 #endif
2288 }
2289
2290 EV_FREQUENT_CHECK;
2291 }
2292
2293 void noinline
2294 ev_signal_stop (EV_P_ ev_signal *w)
2295 {
2296 clear_pending (EV_A_ (W)w);
2297 if (expect_false (!ev_is_active (w)))
2298 return;
2299
2300 EV_FREQUENT_CHECK;
2301
2302 wlist_del (&signals [w->signum - 1].head, (WL)w);
2303 ev_stop (EV_A_ (W)w);
2304
2305 if (!signals [w->signum - 1].head)
2306 signal (w->signum, SIG_DFL);
2307
2308 EV_FREQUENT_CHECK;
2309 }
2310
2311 void
2312 ev_child_start (EV_P_ ev_child *w)
2313 {
2314 #if EV_MULTIPLICITY
2315 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2316 #endif
2317 if (expect_false (ev_is_active (w)))
2318 return;
2319
2320 EV_FREQUENT_CHECK;
2321
2322 ev_start (EV_A_ (W)w, 1);
2323 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2324
2325 EV_FREQUENT_CHECK;
2326 }
2327
2328 void
2329 ev_child_stop (EV_P_ ev_child *w)
2330 {
2331 clear_pending (EV_A_ (W)w);
2332 if (expect_false (!ev_is_active (w)))
2333 return;
2334
2335 EV_FREQUENT_CHECK;
2336
2337 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2338 ev_stop (EV_A_ (W)w);
2339
2340 EV_FREQUENT_CHECK;
2341 }
2342
2343 #if EV_STAT_ENABLE
2344
2345 # ifdef _WIN32
2346 # undef lstat
2347 # define lstat(a,b) _stati64 (a,b)
2348 # endif
2349
2350 #define DEF_STAT_INTERVAL 5.0074891
2351 #define MIN_STAT_INTERVAL 0.1074891
2352
2353 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2354
2355 #if EV_USE_INOTIFY
2356 # define EV_INOTIFY_BUFSIZE 8192
2357
2358 static void noinline
2359 infy_add (EV_P_ ev_stat *w)
2360 {
2361 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);
2362
2363 if (w->wd < 0)
2364 {
2365 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2366
2367 /* monitor some parent directory for speedup hints */
2368 /* note that exceeding the hardcoded limit is not a correctness issue, */
2369 /* but an efficiency issue only */
2370 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2371 {
2372 char path [4096];
2373 strcpy (path, w->path);
2374
2375 do
2376 {
2377 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2378 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2379
2380 char *pend = strrchr (path, '/');
2381
2382 if (!pend)
2383 break; /* whoops, no '/', complain to your admin */
2384
2385 *pend = 0;
2386 w->wd = inotify_add_watch (fs_fd, path, mask);
2387 }
2388 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2389 }
2390 }
2391 else
2392 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2393
2394 if (w->wd >= 0)
2395 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2396 }
2397
2398 static void noinline
2399 infy_del (EV_P_ ev_stat *w)
2400 {
2401 int slot;
2402 int wd = w->wd;
2403
2404 if (wd < 0)
2405 return;
2406
2407 w->wd = -2;
2408 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2409 wlist_del (&fs_hash [slot].head, (WL)w);
2410
2411 /* remove this watcher, if others are watching it, they will rearm */
2412 inotify_rm_watch (fs_fd, wd);
2413 }
2414
2415 static void noinline
2416 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2417 {
2418 if (slot < 0)
2419 /* overflow, need to check for all hahs slots */
2420 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2421 infy_wd (EV_A_ slot, wd, ev);
2422 else
2423 {
2424 WL w_;
2425
2426 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2427 {
2428 ev_stat *w = (ev_stat *)w_;
2429 w_ = w_->next; /* lets us remove this watcher and all before it */
2430
2431 if (w->wd == wd || wd == -1)
2432 {
2433 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2434 {
2435 w->wd = -1;
2436 infy_add (EV_A_ w); /* re-add, no matter what */
2437 }
2438
2439 stat_timer_cb (EV_A_ &w->timer, 0);
2440 }
2441 }
2442 }
2443 }
2444
2445 static void
2446 infy_cb (EV_P_ ev_io *w, int revents)
2447 {
2448 char buf [EV_INOTIFY_BUFSIZE];
2449 struct inotify_event *ev = (struct inotify_event *)buf;
2450 int ofs;
2451 int len = read (fs_fd, buf, sizeof (buf));
2452
2453 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2454 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2455 }
2456
2457 void inline_size
2458 infy_init (EV_P)
2459 {
2460 if (fs_fd != -2)
2461 return;
2462
2463 fs_fd = inotify_init ();
2464
2465 if (fs_fd >= 0)
2466 {
2467 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2468 ev_set_priority (&fs_w, EV_MAXPRI);
2469 ev_io_start (EV_A_ &fs_w);
2470 }
2471 }
2472
2473 void inline_size
2474 infy_fork (EV_P)
2475 {
2476 int slot;
2477
2478 if (fs_fd < 0)
2479 return;
2480
2481 close (fs_fd);
2482 fs_fd = inotify_init ();
2483
2484 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2485 {
2486 WL w_ = fs_hash [slot].head;
2487 fs_hash [slot].head = 0;
2488
2489 while (w_)
2490 {
2491 ev_stat *w = (ev_stat *)w_;
2492 w_ = w_->next; /* lets us add this watcher */
2493
2494 w->wd = -1;
2495
2496 if (fs_fd >= 0)
2497 infy_add (EV_A_ w); /* re-add, no matter what */
2498 else
2499 ev_timer_start (EV_A_ &w->timer);
2500 }
2501
2502 }
2503 }
2504
2505 #endif
2506
2507 void
2508 ev_stat_stat (EV_P_ ev_stat *w)
2509 {
2510 if (lstat (w->path, &w->attr) < 0)
2511 w->attr.st_nlink = 0;
2512 else if (!w->attr.st_nlink)
2513 w->attr.st_nlink = 1;
2514 }
2515
2516 static void noinline
2517 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2518 {
2519 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2520
2521 /* we copy this here each the time so that */
2522 /* prev has the old value when the callback gets invoked */
2523 w->prev = w->attr;
2524 ev_stat_stat (EV_A_ w);
2525
2526 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2527 if (
2528 w->prev.st_dev != w->attr.st_dev
2529 || w->prev.st_ino != w->attr.st_ino
2530 || w->prev.st_mode != w->attr.st_mode
2531 || w->prev.st_nlink != w->attr.st_nlink
2532 || w->prev.st_uid != w->attr.st_uid
2533 || w->prev.st_gid != w->attr.st_gid
2534 || w->prev.st_rdev != w->attr.st_rdev
2535 || w->prev.st_size != w->attr.st_size
2536 || w->prev.st_atime != w->attr.st_atime
2537 || w->prev.st_mtime != w->attr.st_mtime
2538 || w->prev.st_ctime != w->attr.st_ctime
2539 ) {
2540 #if EV_USE_INOTIFY
2541 infy_del (EV_A_ w);
2542 infy_add (EV_A_ w);
2543 ev_stat_stat (EV_A_ w); /* avoid race... */
2544 #endif
2545
2546 ev_feed_event (EV_A_ w, EV_STAT);
2547 }
2548 }
2549
2550 void
2551 ev_stat_start (EV_P_ ev_stat *w)
2552 {
2553 if (expect_false (ev_is_active (w)))
2554 return;
2555
2556 /* since we use memcmp, we need to clear any padding data etc. */
2557 memset (&w->prev, 0, sizeof (ev_statdata));
2558 memset (&w->attr, 0, sizeof (ev_statdata));
2559
2560 ev_stat_stat (EV_A_ w);
2561
2562 if (w->interval < MIN_STAT_INTERVAL)
2563 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2564
2565 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2566 ev_set_priority (&w->timer, ev_priority (w));
2567
2568 #if EV_USE_INOTIFY
2569 infy_init (EV_A);
2570
2571 if (fs_fd >= 0)
2572 infy_add (EV_A_ w);
2573 else
2574 #endif
2575 ev_timer_start (EV_A_ &w->timer);
2576
2577 ev_start (EV_A_ (W)w, 1);
2578
2579 EV_FREQUENT_CHECK;
2580 }
2581
2582 void
2583 ev_stat_stop (EV_P_ ev_stat *w)
2584 {
2585 clear_pending (EV_A_ (W)w);
2586 if (expect_false (!ev_is_active (w)))
2587 return;
2588
2589 EV_FREQUENT_CHECK;
2590
2591 #if EV_USE_INOTIFY
2592 infy_del (EV_A_ w);
2593 #endif
2594 ev_timer_stop (EV_A_ &w->timer);
2595
2596 ev_stop (EV_A_ (W)w);
2597
2598 EV_FREQUENT_CHECK;
2599 }
2600 #endif
2601
2602 #if EV_IDLE_ENABLE
2603 void
2604 ev_idle_start (EV_P_ ev_idle *w)
2605 {
2606 if (expect_false (ev_is_active (w)))
2607 return;
2608
2609 pri_adjust (EV_A_ (W)w);
2610
2611 EV_FREQUENT_CHECK;
2612
2613 {
2614 int active = ++idlecnt [ABSPRI (w)];
2615
2616 ++idleall;
2617 ev_start (EV_A_ (W)w, active);
2618
2619 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2620 idles [ABSPRI (w)][active - 1] = w;
2621 }
2622
2623 EV_FREQUENT_CHECK;
2624 }
2625
2626 void
2627 ev_idle_stop (EV_P_ ev_idle *w)
2628 {
2629 clear_pending (EV_A_ (W)w);
2630 if (expect_false (!ev_is_active (w)))
2631 return;
2632
2633 EV_FREQUENT_CHECK;
2634
2635 {
2636 int active = ev_active (w);
2637
2638 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2639 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2640
2641 ev_stop (EV_A_ (W)w);
2642 --idleall;
2643 }
2644
2645 EV_FREQUENT_CHECK;
2646 }
2647 #endif
2648
2649 void
2650 ev_prepare_start (EV_P_ ev_prepare *w)
2651 {
2652 if (expect_false (ev_is_active (w)))
2653 return;
2654
2655 EV_FREQUENT_CHECK;
2656
2657 ev_start (EV_A_ (W)w, ++preparecnt);
2658 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2659 prepares [preparecnt - 1] = w;
2660
2661 EV_FREQUENT_CHECK;
2662 }
2663
2664 void
2665 ev_prepare_stop (EV_P_ ev_prepare *w)
2666 {
2667 clear_pending (EV_A_ (W)w);
2668 if (expect_false (!ev_is_active (w)))
2669 return;
2670
2671 EV_FREQUENT_CHECK;
2672
2673 {
2674 int active = ev_active (w);
2675
2676 prepares [active - 1] = prepares [--preparecnt];
2677 ev_active (prepares [active - 1]) = active;
2678 }
2679
2680 ev_stop (EV_A_ (W)w);
2681
2682 EV_FREQUENT_CHECK;
2683 }
2684
2685 void
2686 ev_check_start (EV_P_ ev_check *w)
2687 {
2688 if (expect_false (ev_is_active (w)))
2689 return;
2690
2691 EV_FREQUENT_CHECK;
2692
2693 ev_start (EV_A_ (W)w, ++checkcnt);
2694 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2695 checks [checkcnt - 1] = w;
2696
2697 EV_FREQUENT_CHECK;
2698 }
2699
2700 void
2701 ev_check_stop (EV_P_ ev_check *w)
2702 {
2703 clear_pending (EV_A_ (W)w);
2704 if (expect_false (!ev_is_active (w)))
2705 return;
2706
2707 EV_FREQUENT_CHECK;
2708
2709 {
2710 int active = ev_active (w);
2711
2712 checks [active - 1] = checks [--checkcnt];
2713 ev_active (checks [active - 1]) = active;
2714 }
2715
2716 ev_stop (EV_A_ (W)w);
2717
2718 EV_FREQUENT_CHECK;
2719 }
2720
2721 #if EV_EMBED_ENABLE
2722 void noinline
2723 ev_embed_sweep (EV_P_ ev_embed *w)
2724 {
2725 ev_loop (w->other, EVLOOP_NONBLOCK);
2726 }
2727
2728 static void
2729 embed_io_cb (EV_P_ ev_io *io, int revents)
2730 {
2731 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2732
2733 if (ev_cb (w))
2734 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2735 else
2736 ev_loop (w->other, EVLOOP_NONBLOCK);
2737 }
2738
2739 static void
2740 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2741 {
2742 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2743
2744 {
2745 struct ev_loop *loop = w->other;
2746
2747 while (fdchangecnt)
2748 {
2749 fd_reify (EV_A);
2750 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2751 }
2752 }
2753 }
2754
2755 #if 0
2756 static void
2757 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2758 {
2759 ev_idle_stop (EV_A_ idle);
2760 }
2761 #endif
2762
2763 void
2764 ev_embed_start (EV_P_ ev_embed *w)
2765 {
2766 if (expect_false (ev_is_active (w)))
2767 return;
2768
2769 {
2770 struct ev_loop *loop = w->other;
2771 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2772 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2773 }
2774
2775 EV_FREQUENT_CHECK;
2776
2777 ev_set_priority (&w->io, ev_priority (w));
2778 ev_io_start (EV_A_ &w->io);
2779
2780 ev_prepare_init (&w->prepare, embed_prepare_cb);
2781 ev_set_priority (&w->prepare, EV_MINPRI);
2782 ev_prepare_start (EV_A_ &w->prepare);
2783
2784 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2785
2786 ev_start (EV_A_ (W)w, 1);
2787
2788 EV_FREQUENT_CHECK;
2789 }
2790
2791 void
2792 ev_embed_stop (EV_P_ ev_embed *w)
2793 {
2794 clear_pending (EV_A_ (W)w);
2795 if (expect_false (!ev_is_active (w)))
2796 return;
2797
2798 EV_FREQUENT_CHECK;
2799
2800 ev_io_stop (EV_A_ &w->io);
2801 ev_prepare_stop (EV_A_ &w->prepare);
2802
2803 ev_stop (EV_A_ (W)w);
2804
2805 EV_FREQUENT_CHECK;
2806 }
2807 #endif
2808
2809 #if EV_FORK_ENABLE
2810 void
2811 ev_fork_start (EV_P_ ev_fork *w)
2812 {
2813 if (expect_false (ev_is_active (w)))
2814 return;
2815
2816 EV_FREQUENT_CHECK;
2817
2818 ev_start (EV_A_ (W)w, ++forkcnt);
2819 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2820 forks [forkcnt - 1] = w;
2821
2822 EV_FREQUENT_CHECK;
2823 }
2824
2825 void
2826 ev_fork_stop (EV_P_ ev_fork *w)
2827 {
2828 clear_pending (EV_A_ (W)w);
2829 if (expect_false (!ev_is_active (w)))
2830 return;
2831
2832 EV_FREQUENT_CHECK;
2833
2834 {
2835 int active = ev_active (w);
2836
2837 forks [active - 1] = forks [--forkcnt];
2838 ev_active (forks [active - 1]) = active;
2839 }
2840
2841 ev_stop (EV_A_ (W)w);
2842
2843 EV_FREQUENT_CHECK;
2844 }
2845 #endif
2846
2847 #if EV_ASYNC_ENABLE
2848 void
2849 ev_async_start (EV_P_ ev_async *w)
2850 {
2851 if (expect_false (ev_is_active (w)))
2852 return;
2853
2854 evpipe_init (EV_A);
2855
2856 EV_FREQUENT_CHECK;
2857
2858 ev_start (EV_A_ (W)w, ++asynccnt);
2859 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2860 asyncs [asynccnt - 1] = w;
2861
2862 EV_FREQUENT_CHECK;
2863 }
2864
2865 void
2866 ev_async_stop (EV_P_ ev_async *w)
2867 {
2868 clear_pending (EV_A_ (W)w);
2869 if (expect_false (!ev_is_active (w)))
2870 return;
2871
2872 EV_FREQUENT_CHECK;
2873
2874 {
2875 int active = ev_active (w);
2876
2877 asyncs [active - 1] = asyncs [--asynccnt];
2878 ev_active (asyncs [active - 1]) = active;
2879 }
2880
2881 ev_stop (EV_A_ (W)w);
2882
2883 EV_FREQUENT_CHECK;
2884 }
2885
2886 void
2887 ev_async_send (EV_P_ ev_async *w)
2888 {
2889 w->sent = 1;
2890 evpipe_write (EV_A_ &gotasync);
2891 }
2892 #endif
2893
2894 /*****************************************************************************/
2895
2896 struct ev_once
2897 {
2898 ev_io io;
2899 ev_timer to;
2900 void (*cb)(int revents, void *arg);
2901 void *arg;
2902 };
2903
2904 static void
2905 once_cb (EV_P_ struct ev_once *once, int revents)
2906 {
2907 void (*cb)(int revents, void *arg) = once->cb;
2908 void *arg = once->arg;
2909
2910 ev_io_stop (EV_A_ &once->io);
2911 ev_timer_stop (EV_A_ &once->to);
2912 ev_free (once);
2913
2914 cb (revents, arg);
2915 }
2916
2917 static void
2918 once_cb_io (EV_P_ ev_io *w, int revents)
2919 {
2920 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2921 }
2922
2923 static void
2924 once_cb_to (EV_P_ ev_timer *w, int revents)
2925 {
2926 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2927 }
2928
2929 void
2930 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2931 {
2932 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2933
2934 if (expect_false (!once))
2935 {
2936 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2937 return;
2938 }
2939
2940 once->cb = cb;
2941 once->arg = arg;
2942
2943 ev_init (&once->io, once_cb_io);
2944 if (fd >= 0)
2945 {
2946 ev_io_set (&once->io, fd, events);
2947 ev_io_start (EV_A_ &once->io);
2948 }
2949
2950 ev_init (&once->to, once_cb_to);
2951 if (timeout >= 0.)
2952 {
2953 ev_timer_set (&once->to, timeout, 0.);
2954 ev_timer_start (EV_A_ &once->to);
2955 }
2956 }
2957
2958 #if EV_MULTIPLICITY
2959 #include "ev_wrap.h"
2960 #endif
2961
2962 #ifdef __cplusplus
2963 }
2964 #endif
2965