ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev.c
Revision: 1.257
Committed: Sun Jun 29 22:32:51 2008 UTC (16 years ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: rel-3_43, rel-3_431
Changes since 1.256: +3 -0 lines
Log Message:
*** empty log message ***

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 # include <io.h>
160 # define WIN32_LEAN_AND_MEAN
161 # include <windows.h>
162 # ifndef EV_SELECT_IS_WINSOCKET
163 # define EV_SELECT_IS_WINSOCKET 1
164 # endif
165 #endif
166
167 /* this block tries to deduce configuration from header-defined symbols and defaults */
168
169 #ifndef EV_USE_MONOTONIC
170 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
171 # define EV_USE_MONOTONIC 1
172 # else
173 # define EV_USE_MONOTONIC 0
174 # endif
175 #endif
176
177 #ifndef EV_USE_REALTIME
178 # define EV_USE_REALTIME 0
179 #endif
180
181 #ifndef EV_USE_NANOSLEEP
182 # if _POSIX_C_SOURCE >= 199309L
183 # define EV_USE_NANOSLEEP 1
184 # else
185 # define EV_USE_NANOSLEEP 0
186 # endif
187 #endif
188
189 #ifndef EV_USE_SELECT
190 # define EV_USE_SELECT 1
191 #endif
192
193 #ifndef EV_USE_POLL
194 # ifdef _WIN32
195 # define EV_USE_POLL 0
196 # else
197 # define EV_USE_POLL 1
198 # endif
199 #endif
200
201 #ifndef EV_USE_EPOLL
202 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
203 # define EV_USE_EPOLL 1
204 # else
205 # define EV_USE_EPOLL 0
206 # endif
207 #endif
208
209 #ifndef EV_USE_KQUEUE
210 # define EV_USE_KQUEUE 0
211 #endif
212
213 #ifndef EV_USE_PORT
214 # define EV_USE_PORT 0
215 #endif
216
217 #ifndef EV_USE_INOTIFY
218 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
219 # define EV_USE_INOTIFY 1
220 # else
221 # define EV_USE_INOTIFY 0
222 # endif
223 #endif
224
225 #ifndef EV_PID_HASHSIZE
226 # if EV_MINIMAL
227 # define EV_PID_HASHSIZE 1
228 # else
229 # define EV_PID_HASHSIZE 16
230 # endif
231 #endif
232
233 #ifndef EV_INOTIFY_HASHSIZE
234 # if EV_MINIMAL
235 # define EV_INOTIFY_HASHSIZE 1
236 # else
237 # define EV_INOTIFY_HASHSIZE 16
238 # endif
239 #endif
240
241 #ifndef EV_USE_EVENTFD
242 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
243 # define EV_USE_EVENTFD 1
244 # else
245 # define EV_USE_EVENTFD 0
246 # endif
247 #endif
248
249 #if 0 /* debugging */
250 # define EV_VERIFY 3
251 # define EV_USE_4HEAP 1
252 # define EV_HEAP_CACHE_AT 1
253 #endif
254
255 #ifndef EV_VERIFY
256 # define EV_VERIFY !EV_MINIMAL
257 #endif
258
259 #ifndef EV_USE_4HEAP
260 # define EV_USE_4HEAP !EV_MINIMAL
261 #endif
262
263 #ifndef EV_HEAP_CACHE_AT
264 # define EV_HEAP_CACHE_AT !EV_MINIMAL
265 #endif
266
267 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
268
269 #ifndef CLOCK_MONOTONIC
270 # undef EV_USE_MONOTONIC
271 # define EV_USE_MONOTONIC 0
272 #endif
273
274 #ifndef CLOCK_REALTIME
275 # undef EV_USE_REALTIME
276 # define EV_USE_REALTIME 0
277 #endif
278
279 #if !EV_STAT_ENABLE
280 # undef EV_USE_INOTIFY
281 # define EV_USE_INOTIFY 0
282 #endif
283
284 #if !EV_USE_NANOSLEEP
285 # ifndef _WIN32
286 # include <sys/select.h>
287 # endif
288 #endif
289
290 #if EV_USE_INOTIFY
291 # include <sys/inotify.h>
292 #endif
293
294 #if EV_SELECT_IS_WINSOCKET
295 # include <winsock.h>
296 #endif
297
298 #if EV_USE_EVENTFD
299 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
300 # include <stdint.h>
301 # ifdef __cplusplus
302 extern "C" {
303 # endif
304 int eventfd (unsigned int initval, int flags);
305 # ifdef __cplusplus
306 }
307 # endif
308 #endif
309
310 /**/
311
312 #if EV_VERIFY >= 3
313 # define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
314 #else
315 # define EV_FREQUENT_CHECK do { } while (0)
316 #endif
317
318 /*
319 * This is used to avoid floating point rounding problems.
320 * It is added to ev_rt_now when scheduling periodics
321 * to ensure progress, time-wise, even when rounding
322 * errors are against us.
323 * This value is good at least till the year 4000.
324 * Better solutions welcome.
325 */
326 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
327
328 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
329 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
330 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
331
332 #if __GNUC__ >= 4
333 # define expect(expr,value) __builtin_expect ((expr),(value))
334 # define noinline __attribute__ ((noinline))
335 #else
336 # define expect(expr,value) (expr)
337 # define noinline
338 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
339 # define inline
340 # endif
341 #endif
342
343 #define expect_false(expr) expect ((expr) != 0, 0)
344 #define expect_true(expr) expect ((expr) != 0, 1)
345 #define inline_size static inline
346
347 #if EV_MINIMAL
348 # define inline_speed static noinline
349 #else
350 # define inline_speed static inline
351 #endif
352
353 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
354 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
355
356 #define EMPTY /* required for microsofts broken pseudo-c compiler */
357 #define EMPTY2(a,b) /* used to suppress some warnings */
358
359 typedef ev_watcher *W;
360 typedef ev_watcher_list *WL;
361 typedef ev_watcher_time *WT;
362
363 #define ev_active(w) ((W)(w))->active
364 #define ev_at(w) ((WT)(w))->at
365
366 #if EV_USE_MONOTONIC
367 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
368 /* giving it a reasonably high chance of working on typical architetcures */
369 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
370 #endif
371
372 #ifdef _WIN32
373 # include "ev_win32.c"
374 #endif
375
376 /*****************************************************************************/
377
378 static void (*syserr_cb)(const char *msg);
379
380 void
381 ev_set_syserr_cb (void (*cb)(const char *msg))
382 {
383 syserr_cb = cb;
384 }
385
386 static void noinline
387 syserr (const char *msg)
388 {
389 if (!msg)
390 msg = "(libev) system error";
391
392 if (syserr_cb)
393 syserr_cb (msg);
394 else
395 {
396 perror (msg);
397 abort ();
398 }
399 }
400
401 static void *
402 ev_realloc_emul (void *ptr, long size)
403 {
404 /* some systems, notably openbsd and darwin, fail to properly
405 * implement realloc (x, 0) (as required by both ansi c-98 and
406 * the single unix specification, so work around them here.
407 */
408
409 if (size)
410 return realloc (ptr, size);
411
412 free (ptr);
413 return 0;
414 }
415
416 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
417
418 void
419 ev_set_allocator (void *(*cb)(void *ptr, long size))
420 {
421 alloc = cb;
422 }
423
424 inline_speed void *
425 ev_realloc (void *ptr, long size)
426 {
427 ptr = alloc (ptr, size);
428
429 if (!ptr && size)
430 {
431 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
432 abort ();
433 }
434
435 return ptr;
436 }
437
438 #define ev_malloc(size) ev_realloc (0, (size))
439 #define ev_free(ptr) ev_realloc ((ptr), 0)
440
441 /*****************************************************************************/
442
443 typedef struct
444 {
445 WL head;
446 unsigned char events;
447 unsigned char reify;
448 #if EV_SELECT_IS_WINSOCKET
449 SOCKET handle;
450 #endif
451 } ANFD;
452
453 typedef struct
454 {
455 W w;
456 int events;
457 } ANPENDING;
458
459 #if EV_USE_INOTIFY
460 /* hash table entry per inotify-id */
461 typedef struct
462 {
463 WL head;
464 } ANFS;
465 #endif
466
467 /* Heap Entry */
468 #if EV_HEAP_CACHE_AT
469 typedef struct {
470 ev_tstamp at;
471 WT w;
472 } ANHE;
473
474 #define ANHE_w(he) (he).w /* access watcher, read-write */
475 #define ANHE_at(he) (he).at /* access cached at, read-only */
476 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
477 #else
478 typedef WT ANHE;
479
480 #define ANHE_w(he) (he)
481 #define ANHE_at(he) (he)->at
482 #define ANHE_at_cache(he)
483 #endif
484
485 #if EV_MULTIPLICITY
486
487 struct ev_loop
488 {
489 ev_tstamp ev_rt_now;
490 #define ev_rt_now ((loop)->ev_rt_now)
491 #define VAR(name,decl) decl;
492 #include "ev_vars.h"
493 #undef VAR
494 };
495 #include "ev_wrap.h"
496
497 static struct ev_loop default_loop_struct;
498 struct ev_loop *ev_default_loop_ptr;
499
500 #else
501
502 ev_tstamp ev_rt_now;
503 #define VAR(name,decl) static decl;
504 #include "ev_vars.h"
505 #undef VAR
506
507 static int ev_default_loop_ptr;
508
509 #endif
510
511 /*****************************************************************************/
512
513 ev_tstamp
514 ev_time (void)
515 {
516 #if EV_USE_REALTIME
517 struct timespec ts;
518 clock_gettime (CLOCK_REALTIME, &ts);
519 return ts.tv_sec + ts.tv_nsec * 1e-9;
520 #else
521 struct timeval tv;
522 gettimeofday (&tv, 0);
523 return tv.tv_sec + tv.tv_usec * 1e-6;
524 #endif
525 }
526
527 ev_tstamp inline_size
528 get_clock (void)
529 {
530 #if EV_USE_MONOTONIC
531 if (expect_true (have_monotonic))
532 {
533 struct timespec ts;
534 clock_gettime (CLOCK_MONOTONIC, &ts);
535 return ts.tv_sec + ts.tv_nsec * 1e-9;
536 }
537 #endif
538
539 return ev_time ();
540 }
541
542 #if EV_MULTIPLICITY
543 ev_tstamp
544 ev_now (EV_P)
545 {
546 return ev_rt_now;
547 }
548 #endif
549
550 void
551 ev_sleep (ev_tstamp delay)
552 {
553 if (delay > 0.)
554 {
555 #if EV_USE_NANOSLEEP
556 struct timespec ts;
557
558 ts.tv_sec = (time_t)delay;
559 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
560
561 nanosleep (&ts, 0);
562 #elif defined(_WIN32)
563 Sleep ((unsigned long)(delay * 1e3));
564 #else
565 struct timeval tv;
566
567 tv.tv_sec = (time_t)delay;
568 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
569
570 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
571 /* somehting nto guaranteed by newer posix versions, but guaranteed */
572 /* by older ones */
573 select (0, 0, 0, 0, &tv);
574 #endif
575 }
576 }
577
578 /*****************************************************************************/
579
580 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
581
582 int inline_size
583 array_nextsize (int elem, int cur, int cnt)
584 {
585 int ncur = cur + 1;
586
587 do
588 ncur <<= 1;
589 while (cnt > ncur);
590
591 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
592 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
593 {
594 ncur *= elem;
595 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
596 ncur = ncur - sizeof (void *) * 4;
597 ncur /= elem;
598 }
599
600 return ncur;
601 }
602
603 static noinline void *
604 array_realloc (int elem, void *base, int *cur, int cnt)
605 {
606 *cur = array_nextsize (elem, *cur, cnt);
607 return ev_realloc (base, elem * *cur);
608 }
609
610 #define array_needsize(type,base,cur,cnt,init) \
611 if (expect_false ((cnt) > (cur))) \
612 { \
613 int ocur_ = (cur); \
614 (base) = (type *)array_realloc \
615 (sizeof (type), (base), &(cur), (cnt)); \
616 init ((base) + (ocur_), (cur) - ocur_); \
617 }
618
619 #if 0
620 #define array_slim(type,stem) \
621 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
622 { \
623 stem ## max = array_roundsize (stem ## cnt >> 1); \
624 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
625 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
626 }
627 #endif
628
629 #define array_free(stem, idx) \
630 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
631
632 /*****************************************************************************/
633
634 void noinline
635 ev_feed_event (EV_P_ void *w, int revents)
636 {
637 W w_ = (W)w;
638 int pri = ABSPRI (w_);
639
640 if (expect_false (w_->pending))
641 pendings [pri][w_->pending - 1].events |= revents;
642 else
643 {
644 w_->pending = ++pendingcnt [pri];
645 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
646 pendings [pri][w_->pending - 1].w = w_;
647 pendings [pri][w_->pending - 1].events = revents;
648 }
649 }
650
651 void inline_speed
652 queue_events (EV_P_ W *events, int eventcnt, int type)
653 {
654 int i;
655
656 for (i = 0; i < eventcnt; ++i)
657 ev_feed_event (EV_A_ events [i], type);
658 }
659
660 /*****************************************************************************/
661
662 void inline_size
663 anfds_init (ANFD *base, int count)
664 {
665 while (count--)
666 {
667 base->head = 0;
668 base->events = EV_NONE;
669 base->reify = 0;
670
671 ++base;
672 }
673 }
674
675 void inline_speed
676 fd_event (EV_P_ int fd, int revents)
677 {
678 ANFD *anfd = anfds + fd;
679 ev_io *w;
680
681 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
682 {
683 int ev = w->events & revents;
684
685 if (ev)
686 ev_feed_event (EV_A_ (W)w, ev);
687 }
688 }
689
690 void
691 ev_feed_fd_event (EV_P_ int fd, int revents)
692 {
693 if (fd >= 0 && fd < anfdmax)
694 fd_event (EV_A_ fd, revents);
695 }
696
697 void inline_size
698 fd_reify (EV_P)
699 {
700 int i;
701
702 for (i = 0; i < fdchangecnt; ++i)
703 {
704 int fd = fdchanges [i];
705 ANFD *anfd = anfds + fd;
706 ev_io *w;
707
708 unsigned char events = 0;
709
710 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
711 events |= (unsigned char)w->events;
712
713 #if EV_SELECT_IS_WINSOCKET
714 if (events)
715 {
716 unsigned long arg;
717 #ifdef EV_FD_TO_WIN32_HANDLE
718 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
719 #else
720 anfd->handle = _get_osfhandle (fd);
721 #endif
722 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
723 }
724 #endif
725
726 {
727 unsigned char o_events = anfd->events;
728 unsigned char o_reify = anfd->reify;
729
730 anfd->reify = 0;
731 anfd->events = events;
732
733 if (o_events != events || o_reify & EV_IOFDSET)
734 backend_modify (EV_A_ fd, o_events, events);
735 }
736 }
737
738 fdchangecnt = 0;
739 }
740
741 void inline_size
742 fd_change (EV_P_ int fd, int flags)
743 {
744 unsigned char reify = anfds [fd].reify;
745 anfds [fd].reify |= flags;
746
747 if (expect_true (!reify))
748 {
749 ++fdchangecnt;
750 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
751 fdchanges [fdchangecnt - 1] = fd;
752 }
753 }
754
755 void inline_speed
756 fd_kill (EV_P_ int fd)
757 {
758 ev_io *w;
759
760 while ((w = (ev_io *)anfds [fd].head))
761 {
762 ev_io_stop (EV_A_ w);
763 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
764 }
765 }
766
767 int inline_size
768 fd_valid (int fd)
769 {
770 #ifdef _WIN32
771 return _get_osfhandle (fd) != -1;
772 #else
773 return fcntl (fd, F_GETFD) != -1;
774 #endif
775 }
776
777 /* called on EBADF to verify fds */
778 static void noinline
779 fd_ebadf (EV_P)
780 {
781 int fd;
782
783 for (fd = 0; fd < anfdmax; ++fd)
784 if (anfds [fd].events)
785 if (!fd_valid (fd) && errno == EBADF)
786 fd_kill (EV_A_ fd);
787 }
788
789 /* called on ENOMEM in select/poll to kill some fds and retry */
790 static void noinline
791 fd_enomem (EV_P)
792 {
793 int fd;
794
795 for (fd = anfdmax; fd--; )
796 if (anfds [fd].events)
797 {
798 fd_kill (EV_A_ fd);
799 return;
800 }
801 }
802
803 /* usually called after fork if backend needs to re-arm all fds from scratch */
804 static void noinline
805 fd_rearm_all (EV_P)
806 {
807 int fd;
808
809 for (fd = 0; fd < anfdmax; ++fd)
810 if (anfds [fd].events)
811 {
812 anfds [fd].events = 0;
813 fd_change (EV_A_ fd, EV_IOFDSET | 1);
814 }
815 }
816
817 /*****************************************************************************/
818
819 /*
820 * the heap functions want a real array index. array index 0 uis guaranteed to not
821 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
822 * the branching factor of the d-tree.
823 */
824
825 /*
826 * at the moment we allow libev the luxury of two heaps,
827 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
828 * which is more cache-efficient.
829 * the difference is about 5% with 50000+ watchers.
830 */
831 #if EV_USE_4HEAP
832
833 #define DHEAP 4
834 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
835 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
836 #define UPHEAP_DONE(p,k) ((p) == (k))
837
838 /* away from the root */
839 void inline_speed
840 downheap (ANHE *heap, int N, int k)
841 {
842 ANHE he = heap [k];
843 ANHE *E = heap + N + HEAP0;
844
845 for (;;)
846 {
847 ev_tstamp minat;
848 ANHE *minpos;
849 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
850
851 /* find minimum child */
852 if (expect_true (pos + DHEAP - 1 < E))
853 {
854 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
855 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
856 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
857 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
858 }
859 else if (pos < E)
860 {
861 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
862 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
863 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
864 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
865 }
866 else
867 break;
868
869 if (ANHE_at (he) <= minat)
870 break;
871
872 heap [k] = *minpos;
873 ev_active (ANHE_w (*minpos)) = k;
874
875 k = minpos - heap;
876 }
877
878 heap [k] = he;
879 ev_active (ANHE_w (he)) = k;
880 }
881
882 #else /* 4HEAP */
883
884 #define HEAP0 1
885 #define HPARENT(k) ((k) >> 1)
886 #define UPHEAP_DONE(p,k) (!(p))
887
888 /* away from the root */
889 void inline_speed
890 downheap (ANHE *heap, int N, int k)
891 {
892 ANHE he = heap [k];
893
894 for (;;)
895 {
896 int c = k << 1;
897
898 if (c > N + HEAP0 - 1)
899 break;
900
901 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
902 ? 1 : 0;
903
904 if (ANHE_at (he) <= ANHE_at (heap [c]))
905 break;
906
907 heap [k] = heap [c];
908 ev_active (ANHE_w (heap [k])) = k;
909
910 k = c;
911 }
912
913 heap [k] = he;
914 ev_active (ANHE_w (he)) = k;
915 }
916 #endif
917
918 /* towards the root */
919 void inline_speed
920 upheap (ANHE *heap, int k)
921 {
922 ANHE he = heap [k];
923
924 for (;;)
925 {
926 int p = HPARENT (k);
927
928 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
929 break;
930
931 heap [k] = heap [p];
932 ev_active (ANHE_w (heap [k])) = k;
933 k = p;
934 }
935
936 heap [k] = he;
937 ev_active (ANHE_w (he)) = k;
938 }
939
940 void inline_size
941 adjustheap (ANHE *heap, int N, int k)
942 {
943 if (k > HEAP0 && ANHE_at (heap [HPARENT (k)]) >= ANHE_at (heap [k]))
944 upheap (heap, k);
945 else
946 downheap (heap, N, k);
947 }
948
949 /* rebuild the heap: this function is used only once and executed rarely */
950 void inline_size
951 reheap (ANHE *heap, int N)
952 {
953 int i;
954
955 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
956 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
957 for (i = 0; i < N; ++i)
958 upheap (heap, i + HEAP0);
959 }
960
961 /*****************************************************************************/
962
963 typedef struct
964 {
965 WL head;
966 EV_ATOMIC_T gotsig;
967 } ANSIG;
968
969 static ANSIG *signals;
970 static int signalmax;
971
972 static EV_ATOMIC_T gotsig;
973
974 void inline_size
975 signals_init (ANSIG *base, int count)
976 {
977 while (count--)
978 {
979 base->head = 0;
980 base->gotsig = 0;
981
982 ++base;
983 }
984 }
985
986 /*****************************************************************************/
987
988 void inline_speed
989 fd_intern (int fd)
990 {
991 #ifdef _WIN32
992 unsigned long arg = 1;
993 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
994 #else
995 fcntl (fd, F_SETFD, FD_CLOEXEC);
996 fcntl (fd, F_SETFL, O_NONBLOCK);
997 #endif
998 }
999
1000 static void noinline
1001 evpipe_init (EV_P)
1002 {
1003 if (!ev_is_active (&pipeev))
1004 {
1005 #if EV_USE_EVENTFD
1006 if ((evfd = eventfd (0, 0)) >= 0)
1007 {
1008 evpipe [0] = -1;
1009 fd_intern (evfd);
1010 ev_io_set (&pipeev, evfd, EV_READ);
1011 }
1012 else
1013 #endif
1014 {
1015 while (pipe (evpipe))
1016 syserr ("(libev) error creating signal/async pipe");
1017
1018 fd_intern (evpipe [0]);
1019 fd_intern (evpipe [1]);
1020 ev_io_set (&pipeev, evpipe [0], EV_READ);
1021 }
1022
1023 ev_io_start (EV_A_ &pipeev);
1024 ev_unref (EV_A); /* watcher should not keep loop alive */
1025 }
1026 }
1027
1028 void inline_size
1029 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1030 {
1031 if (!*flag)
1032 {
1033 int old_errno = errno; /* save errno because write might clobber it */
1034
1035 *flag = 1;
1036
1037 #if EV_USE_EVENTFD
1038 if (evfd >= 0)
1039 {
1040 uint64_t counter = 1;
1041 write (evfd, &counter, sizeof (uint64_t));
1042 }
1043 else
1044 #endif
1045 write (evpipe [1], &old_errno, 1);
1046
1047 errno = old_errno;
1048 }
1049 }
1050
1051 static void
1052 pipecb (EV_P_ ev_io *iow, int revents)
1053 {
1054 #if EV_USE_EVENTFD
1055 if (evfd >= 0)
1056 {
1057 uint64_t counter;
1058 read (evfd, &counter, sizeof (uint64_t));
1059 }
1060 else
1061 #endif
1062 {
1063 char dummy;
1064 read (evpipe [0], &dummy, 1);
1065 }
1066
1067 if (gotsig && ev_is_default_loop (EV_A))
1068 {
1069 int signum;
1070 gotsig = 0;
1071
1072 for (signum = signalmax; signum--; )
1073 if (signals [signum].gotsig)
1074 ev_feed_signal_event (EV_A_ signum + 1);
1075 }
1076
1077 #if EV_ASYNC_ENABLE
1078 if (gotasync)
1079 {
1080 int i;
1081 gotasync = 0;
1082
1083 for (i = asynccnt; i--; )
1084 if (asyncs [i]->sent)
1085 {
1086 asyncs [i]->sent = 0;
1087 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1088 }
1089 }
1090 #endif
1091 }
1092
1093 /*****************************************************************************/
1094
1095 static void
1096 ev_sighandler (int signum)
1097 {
1098 #if EV_MULTIPLICITY
1099 struct ev_loop *loop = &default_loop_struct;
1100 #endif
1101
1102 #if _WIN32
1103 signal (signum, ev_sighandler);
1104 #endif
1105
1106 signals [signum - 1].gotsig = 1;
1107 evpipe_write (EV_A_ &gotsig);
1108 }
1109
1110 void noinline
1111 ev_feed_signal_event (EV_P_ int signum)
1112 {
1113 WL w;
1114
1115 #if EV_MULTIPLICITY
1116 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1117 #endif
1118
1119 --signum;
1120
1121 if (signum < 0 || signum >= signalmax)
1122 return;
1123
1124 signals [signum].gotsig = 0;
1125
1126 for (w = signals [signum].head; w; w = w->next)
1127 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1128 }
1129
1130 /*****************************************************************************/
1131
1132 static WL childs [EV_PID_HASHSIZE];
1133
1134 #ifndef _WIN32
1135
1136 static ev_signal childev;
1137
1138 #ifndef WIFCONTINUED
1139 # define WIFCONTINUED(status) 0
1140 #endif
1141
1142 void inline_speed
1143 child_reap (EV_P_ int chain, int pid, int status)
1144 {
1145 ev_child *w;
1146 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1147
1148 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1149 {
1150 if ((w->pid == pid || !w->pid)
1151 && (!traced || (w->flags & 1)))
1152 {
1153 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1154 w->rpid = pid;
1155 w->rstatus = status;
1156 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1157 }
1158 }
1159 }
1160
1161 #ifndef WCONTINUED
1162 # define WCONTINUED 0
1163 #endif
1164
1165 static void
1166 childcb (EV_P_ ev_signal *sw, int revents)
1167 {
1168 int pid, status;
1169
1170 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1171 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1172 if (!WCONTINUED
1173 || errno != EINVAL
1174 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1175 return;
1176
1177 /* make sure we are called again until all children have been reaped */
1178 /* we need to do it this way so that the callback gets called before we continue */
1179 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1180
1181 child_reap (EV_A_ pid, pid, status);
1182 if (EV_PID_HASHSIZE > 1)
1183 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1184 }
1185
1186 #endif
1187
1188 /*****************************************************************************/
1189
1190 #if EV_USE_PORT
1191 # include "ev_port.c"
1192 #endif
1193 #if EV_USE_KQUEUE
1194 # include "ev_kqueue.c"
1195 #endif
1196 #if EV_USE_EPOLL
1197 # include "ev_epoll.c"
1198 #endif
1199 #if EV_USE_POLL
1200 # include "ev_poll.c"
1201 #endif
1202 #if EV_USE_SELECT
1203 # include "ev_select.c"
1204 #endif
1205
1206 int
1207 ev_version_major (void)
1208 {
1209 return EV_VERSION_MAJOR;
1210 }
1211
1212 int
1213 ev_version_minor (void)
1214 {
1215 return EV_VERSION_MINOR;
1216 }
1217
1218 /* return true if we are running with elevated privileges and should ignore env variables */
1219 int inline_size
1220 enable_secure (void)
1221 {
1222 #ifdef _WIN32
1223 return 0;
1224 #else
1225 return getuid () != geteuid ()
1226 || getgid () != getegid ();
1227 #endif
1228 }
1229
1230 unsigned int
1231 ev_supported_backends (void)
1232 {
1233 unsigned int flags = 0;
1234
1235 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1236 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1237 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1238 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1239 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1240
1241 return flags;
1242 }
1243
1244 unsigned int
1245 ev_recommended_backends (void)
1246 {
1247 unsigned int flags = ev_supported_backends ();
1248
1249 #ifndef __NetBSD__
1250 /* kqueue is borked on everything but netbsd apparently */
1251 /* it usually doesn't work correctly on anything but sockets and pipes */
1252 flags &= ~EVBACKEND_KQUEUE;
1253 #endif
1254 #ifdef __APPLE__
1255 // flags &= ~EVBACKEND_KQUEUE; for documentation
1256 flags &= ~EVBACKEND_POLL;
1257 #endif
1258
1259 return flags;
1260 }
1261
1262 unsigned int
1263 ev_embeddable_backends (void)
1264 {
1265 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1266
1267 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1268 /* please fix it and tell me how to detect the fix */
1269 flags &= ~EVBACKEND_EPOLL;
1270
1271 return flags;
1272 }
1273
1274 unsigned int
1275 ev_backend (EV_P)
1276 {
1277 return backend;
1278 }
1279
1280 unsigned int
1281 ev_loop_count (EV_P)
1282 {
1283 return loop_count;
1284 }
1285
1286 void
1287 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1288 {
1289 io_blocktime = interval;
1290 }
1291
1292 void
1293 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1294 {
1295 timeout_blocktime = interval;
1296 }
1297
1298 static void noinline
1299 loop_init (EV_P_ unsigned int flags)
1300 {
1301 if (!backend)
1302 {
1303 #if EV_USE_MONOTONIC
1304 {
1305 struct timespec ts;
1306 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1307 have_monotonic = 1;
1308 }
1309 #endif
1310
1311 ev_rt_now = ev_time ();
1312 mn_now = get_clock ();
1313 now_floor = mn_now;
1314 rtmn_diff = ev_rt_now - mn_now;
1315
1316 io_blocktime = 0.;
1317 timeout_blocktime = 0.;
1318 backend = 0;
1319 backend_fd = -1;
1320 gotasync = 0;
1321 #if EV_USE_INOTIFY
1322 fs_fd = -2;
1323 #endif
1324
1325 /* pid check not overridable via env */
1326 #ifndef _WIN32
1327 if (flags & EVFLAG_FORKCHECK)
1328 curpid = getpid ();
1329 #endif
1330
1331 if (!(flags & EVFLAG_NOENV)
1332 && !enable_secure ()
1333 && getenv ("LIBEV_FLAGS"))
1334 flags = atoi (getenv ("LIBEV_FLAGS"));
1335
1336 if (!(flags & 0x0000ffffU))
1337 flags |= ev_recommended_backends ();
1338
1339 #if EV_USE_PORT
1340 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1341 #endif
1342 #if EV_USE_KQUEUE
1343 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1344 #endif
1345 #if EV_USE_EPOLL
1346 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1347 #endif
1348 #if EV_USE_POLL
1349 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1350 #endif
1351 #if EV_USE_SELECT
1352 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1353 #endif
1354
1355 ev_init (&pipeev, pipecb);
1356 ev_set_priority (&pipeev, EV_MAXPRI);
1357 }
1358 }
1359
1360 static void noinline
1361 loop_destroy (EV_P)
1362 {
1363 int i;
1364
1365 if (ev_is_active (&pipeev))
1366 {
1367 ev_ref (EV_A); /* signal watcher */
1368 ev_io_stop (EV_A_ &pipeev);
1369
1370 #if EV_USE_EVENTFD
1371 if (evfd >= 0)
1372 close (evfd);
1373 #endif
1374
1375 if (evpipe [0] >= 0)
1376 {
1377 close (evpipe [0]);
1378 close (evpipe [1]);
1379 }
1380 }
1381
1382 #if EV_USE_INOTIFY
1383 if (fs_fd >= 0)
1384 close (fs_fd);
1385 #endif
1386
1387 if (backend_fd >= 0)
1388 close (backend_fd);
1389
1390 #if EV_USE_PORT
1391 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1392 #endif
1393 #if EV_USE_KQUEUE
1394 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1395 #endif
1396 #if EV_USE_EPOLL
1397 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1398 #endif
1399 #if EV_USE_POLL
1400 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1401 #endif
1402 #if EV_USE_SELECT
1403 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1404 #endif
1405
1406 for (i = NUMPRI; i--; )
1407 {
1408 array_free (pending, [i]);
1409 #if EV_IDLE_ENABLE
1410 array_free (idle, [i]);
1411 #endif
1412 }
1413
1414 ev_free (anfds); anfdmax = 0;
1415
1416 /* have to use the microsoft-never-gets-it-right macro */
1417 array_free (fdchange, EMPTY);
1418 array_free (timer, EMPTY);
1419 #if EV_PERIODIC_ENABLE
1420 array_free (periodic, EMPTY);
1421 #endif
1422 #if EV_FORK_ENABLE
1423 array_free (fork, EMPTY);
1424 #endif
1425 array_free (prepare, EMPTY);
1426 array_free (check, EMPTY);
1427 #if EV_ASYNC_ENABLE
1428 array_free (async, EMPTY);
1429 #endif
1430
1431 backend = 0;
1432 }
1433
1434 #if EV_USE_INOTIFY
1435 void inline_size infy_fork (EV_P);
1436 #endif
1437
1438 void inline_size
1439 loop_fork (EV_P)
1440 {
1441 #if EV_USE_PORT
1442 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1443 #endif
1444 #if EV_USE_KQUEUE
1445 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1446 #endif
1447 #if EV_USE_EPOLL
1448 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1449 #endif
1450 #if EV_USE_INOTIFY
1451 infy_fork (EV_A);
1452 #endif
1453
1454 if (ev_is_active (&pipeev))
1455 {
1456 /* this "locks" the handlers against writing to the pipe */
1457 /* while we modify the fd vars */
1458 gotsig = 1;
1459 #if EV_ASYNC_ENABLE
1460 gotasync = 1;
1461 #endif
1462
1463 ev_ref (EV_A);
1464 ev_io_stop (EV_A_ &pipeev);
1465
1466 #if EV_USE_EVENTFD
1467 if (evfd >= 0)
1468 close (evfd);
1469 #endif
1470
1471 if (evpipe [0] >= 0)
1472 {
1473 close (evpipe [0]);
1474 close (evpipe [1]);
1475 }
1476
1477 evpipe_init (EV_A);
1478 /* now iterate over everything, in case we missed something */
1479 pipecb (EV_A_ &pipeev, EV_READ);
1480 }
1481
1482 postfork = 0;
1483 }
1484
1485 #if EV_MULTIPLICITY
1486
1487 struct ev_loop *
1488 ev_loop_new (unsigned int flags)
1489 {
1490 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1491
1492 memset (loop, 0, sizeof (struct ev_loop));
1493
1494 loop_init (EV_A_ flags);
1495
1496 if (ev_backend (EV_A))
1497 return loop;
1498
1499 return 0;
1500 }
1501
1502 void
1503 ev_loop_destroy (EV_P)
1504 {
1505 loop_destroy (EV_A);
1506 ev_free (loop);
1507 }
1508
1509 void
1510 ev_loop_fork (EV_P)
1511 {
1512 postfork = 1; /* must be in line with ev_default_fork */
1513 }
1514
1515 #if EV_VERIFY
1516 void noinline
1517 verify_watcher (EV_P_ W w)
1518 {
1519 assert (("watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1520
1521 if (w->pending)
1522 assert (("pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1523 }
1524
1525 static void noinline
1526 verify_heap (EV_P_ ANHE *heap, int N)
1527 {
1528 int i;
1529
1530 for (i = HEAP0; i < N + HEAP0; ++i)
1531 {
1532 assert (("active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1533 assert (("heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1534 assert (("heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1535
1536 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1537 }
1538 }
1539
1540 static void noinline
1541 array_verify (EV_P_ W *ws, int cnt)
1542 {
1543 while (cnt--)
1544 {
1545 assert (("active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1546 verify_watcher (EV_A_ ws [cnt]);
1547 }
1548 }
1549 #endif
1550
1551 void
1552 ev_loop_verify (EV_P)
1553 {
1554 #if EV_VERIFY
1555 int i;
1556 WL w;
1557
1558 assert (activecnt >= -1);
1559
1560 assert (fdchangemax >= fdchangecnt);
1561 for (i = 0; i < fdchangecnt; ++i)
1562 assert (("negative fd in fdchanges", fdchanges [i] >= 0));
1563
1564 assert (anfdmax >= 0);
1565 for (i = 0; i < anfdmax; ++i)
1566 for (w = anfds [i].head; w; w = w->next)
1567 {
1568 verify_watcher (EV_A_ (W)w);
1569 assert (("inactive fd watcher on anfd list", ev_active (w) == 1));
1570 assert (("fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1571 }
1572
1573 assert (timermax >= timercnt);
1574 verify_heap (EV_A_ timers, timercnt);
1575
1576 #if EV_PERIODIC_ENABLE
1577 assert (periodicmax >= periodiccnt);
1578 verify_heap (EV_A_ periodics, periodiccnt);
1579 #endif
1580
1581 for (i = NUMPRI; i--; )
1582 {
1583 assert (pendingmax [i] >= pendingcnt [i]);
1584 #if EV_IDLE_ENABLE
1585 assert (idleall >= 0);
1586 assert (idlemax [i] >= idlecnt [i]);
1587 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1588 #endif
1589 }
1590
1591 #if EV_FORK_ENABLE
1592 assert (forkmax >= forkcnt);
1593 array_verify (EV_A_ (W *)forks, forkcnt);
1594 #endif
1595
1596 #if EV_ASYNC_ENABLE
1597 assert (asyncmax >= asynccnt);
1598 array_verify (EV_A_ (W *)asyncs, asynccnt);
1599 #endif
1600
1601 assert (preparemax >= preparecnt);
1602 array_verify (EV_A_ (W *)prepares, preparecnt);
1603
1604 assert (checkmax >= checkcnt);
1605 array_verify (EV_A_ (W *)checks, checkcnt);
1606
1607 # if 0
1608 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1609 for (signum = signalmax; signum--; ) if (signals [signum].gotsig)
1610 # endif
1611 #endif
1612 }
1613
1614 #endif /* multiplicity */
1615
1616 #if EV_MULTIPLICITY
1617 struct ev_loop *
1618 ev_default_loop_init (unsigned int flags)
1619 #else
1620 int
1621 ev_default_loop (unsigned int flags)
1622 #endif
1623 {
1624 if (!ev_default_loop_ptr)
1625 {
1626 #if EV_MULTIPLICITY
1627 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1628 #else
1629 ev_default_loop_ptr = 1;
1630 #endif
1631
1632 loop_init (EV_A_ flags);
1633
1634 if (ev_backend (EV_A))
1635 {
1636 #ifndef _WIN32
1637 ev_signal_init (&childev, childcb, SIGCHLD);
1638 ev_set_priority (&childev, EV_MAXPRI);
1639 ev_signal_start (EV_A_ &childev);
1640 ev_unref (EV_A); /* child watcher should not keep loop alive */
1641 #endif
1642 }
1643 else
1644 ev_default_loop_ptr = 0;
1645 }
1646
1647 return ev_default_loop_ptr;
1648 }
1649
1650 void
1651 ev_default_destroy (void)
1652 {
1653 #if EV_MULTIPLICITY
1654 struct ev_loop *loop = ev_default_loop_ptr;
1655 #endif
1656
1657 #ifndef _WIN32
1658 ev_ref (EV_A); /* child watcher */
1659 ev_signal_stop (EV_A_ &childev);
1660 #endif
1661
1662 loop_destroy (EV_A);
1663 }
1664
1665 void
1666 ev_default_fork (void)
1667 {
1668 #if EV_MULTIPLICITY
1669 struct ev_loop *loop = ev_default_loop_ptr;
1670 #endif
1671
1672 if (backend)
1673 postfork = 1; /* must be in line with ev_loop_fork */
1674 }
1675
1676 /*****************************************************************************/
1677
1678 void
1679 ev_invoke (EV_P_ void *w, int revents)
1680 {
1681 EV_CB_INVOKE ((W)w, revents);
1682 }
1683
1684 void inline_speed
1685 call_pending (EV_P)
1686 {
1687 int pri;
1688
1689 for (pri = NUMPRI; pri--; )
1690 while (pendingcnt [pri])
1691 {
1692 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1693
1694 if (expect_true (p->w))
1695 {
1696 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1697
1698 p->w->pending = 0;
1699 EV_CB_INVOKE (p->w, p->events);
1700 EV_FREQUENT_CHECK;
1701 }
1702 }
1703 }
1704
1705 #if EV_IDLE_ENABLE
1706 void inline_size
1707 idle_reify (EV_P)
1708 {
1709 if (expect_false (idleall))
1710 {
1711 int pri;
1712
1713 for (pri = NUMPRI; pri--; )
1714 {
1715 if (pendingcnt [pri])
1716 break;
1717
1718 if (idlecnt [pri])
1719 {
1720 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1721 break;
1722 }
1723 }
1724 }
1725 }
1726 #endif
1727
1728 void inline_size
1729 timers_reify (EV_P)
1730 {
1731 EV_FREQUENT_CHECK;
1732
1733 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
1734 {
1735 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
1736
1737 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1738
1739 /* first reschedule or stop timer */
1740 if (w->repeat)
1741 {
1742 ev_at (w) += w->repeat;
1743 if (ev_at (w) < mn_now)
1744 ev_at (w) = mn_now;
1745
1746 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1747
1748 ANHE_at_cache (timers [HEAP0]);
1749 downheap (timers, timercnt, HEAP0);
1750 }
1751 else
1752 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1753
1754 EV_FREQUENT_CHECK;
1755 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1756 }
1757 }
1758
1759 #if EV_PERIODIC_ENABLE
1760 void inline_size
1761 periodics_reify (EV_P)
1762 {
1763 EV_FREQUENT_CHECK;
1764
1765 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
1766 {
1767 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
1768
1769 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1770
1771 /* first reschedule or stop timer */
1772 if (w->reschedule_cb)
1773 {
1774 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1775
1776 assert (("ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
1777
1778 ANHE_at_cache (periodics [HEAP0]);
1779 downheap (periodics, periodiccnt, HEAP0);
1780 }
1781 else if (w->interval)
1782 {
1783 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1784 /* if next trigger time is not sufficiently in the future, put it there */
1785 /* this might happen because of floating point inexactness */
1786 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
1787 {
1788 ev_at (w) += w->interval;
1789
1790 /* if interval is unreasonably low we might still have a time in the past */
1791 /* so correct this. this will make the periodic very inexact, but the user */
1792 /* has effectively asked to get triggered more often than possible */
1793 if (ev_at (w) < ev_rt_now)
1794 ev_at (w) = ev_rt_now;
1795 }
1796
1797 ANHE_at_cache (periodics [HEAP0]);
1798 downheap (periodics, periodiccnt, HEAP0);
1799 }
1800 else
1801 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1802
1803 EV_FREQUENT_CHECK;
1804 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1805 }
1806 }
1807
1808 static void noinline
1809 periodics_reschedule (EV_P)
1810 {
1811 int i;
1812
1813 /* adjust periodics after time jump */
1814 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
1815 {
1816 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
1817
1818 if (w->reschedule_cb)
1819 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1820 else if (w->interval)
1821 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1822
1823 ANHE_at_cache (periodics [i]);
1824 }
1825
1826 reheap (periodics, periodiccnt);
1827 }
1828 #endif
1829
1830 void inline_speed
1831 time_update (EV_P_ ev_tstamp max_block)
1832 {
1833 int i;
1834
1835 #if EV_USE_MONOTONIC
1836 if (expect_true (have_monotonic))
1837 {
1838 ev_tstamp odiff = rtmn_diff;
1839
1840 mn_now = get_clock ();
1841
1842 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1843 /* interpolate in the meantime */
1844 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1845 {
1846 ev_rt_now = rtmn_diff + mn_now;
1847 return;
1848 }
1849
1850 now_floor = mn_now;
1851 ev_rt_now = ev_time ();
1852
1853 /* loop a few times, before making important decisions.
1854 * on the choice of "4": one iteration isn't enough,
1855 * in case we get preempted during the calls to
1856 * ev_time and get_clock. a second call is almost guaranteed
1857 * to succeed in that case, though. and looping a few more times
1858 * doesn't hurt either as we only do this on time-jumps or
1859 * in the unlikely event of having been preempted here.
1860 */
1861 for (i = 4; --i; )
1862 {
1863 rtmn_diff = ev_rt_now - mn_now;
1864
1865 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
1866 return; /* all is well */
1867
1868 ev_rt_now = ev_time ();
1869 mn_now = get_clock ();
1870 now_floor = mn_now;
1871 }
1872
1873 # if EV_PERIODIC_ENABLE
1874 periodics_reschedule (EV_A);
1875 # endif
1876 /* no timer adjustment, as the monotonic clock doesn't jump */
1877 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1878 }
1879 else
1880 #endif
1881 {
1882 ev_rt_now = ev_time ();
1883
1884 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1885 {
1886 #if EV_PERIODIC_ENABLE
1887 periodics_reschedule (EV_A);
1888 #endif
1889 /* adjust timers. this is easy, as the offset is the same for all of them */
1890 for (i = 0; i < timercnt; ++i)
1891 {
1892 ANHE *he = timers + i + HEAP0;
1893 ANHE_w (*he)->at += ev_rt_now - mn_now;
1894 ANHE_at_cache (*he);
1895 }
1896 }
1897
1898 mn_now = ev_rt_now;
1899 }
1900 }
1901
1902 void
1903 ev_ref (EV_P)
1904 {
1905 ++activecnt;
1906 }
1907
1908 void
1909 ev_unref (EV_P)
1910 {
1911 --activecnt;
1912 }
1913
1914 static int loop_done;
1915
1916 void
1917 ev_loop (EV_P_ int flags)
1918 {
1919 loop_done = EVUNLOOP_CANCEL;
1920
1921 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1922
1923 do
1924 {
1925 #if EV_VERIFY >= 2
1926 ev_loop_verify (EV_A);
1927 #endif
1928
1929 #ifndef _WIN32
1930 if (expect_false (curpid)) /* penalise the forking check even more */
1931 if (expect_false (getpid () != curpid))
1932 {
1933 curpid = getpid ();
1934 postfork = 1;
1935 }
1936 #endif
1937
1938 #if EV_FORK_ENABLE
1939 /* we might have forked, so queue fork handlers */
1940 if (expect_false (postfork))
1941 if (forkcnt)
1942 {
1943 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1944 call_pending (EV_A);
1945 }
1946 #endif
1947
1948 /* queue prepare watchers (and execute them) */
1949 if (expect_false (preparecnt))
1950 {
1951 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1952 call_pending (EV_A);
1953 }
1954
1955 if (expect_false (!activecnt))
1956 break;
1957
1958 /* we might have forked, so reify kernel state if necessary */
1959 if (expect_false (postfork))
1960 loop_fork (EV_A);
1961
1962 /* update fd-related kernel structures */
1963 fd_reify (EV_A);
1964
1965 /* calculate blocking time */
1966 {
1967 ev_tstamp waittime = 0.;
1968 ev_tstamp sleeptime = 0.;
1969
1970 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1971 {
1972 /* update time to cancel out callback processing overhead */
1973 time_update (EV_A_ 1e100);
1974
1975 waittime = MAX_BLOCKTIME;
1976
1977 if (timercnt)
1978 {
1979 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
1980 if (waittime > to) waittime = to;
1981 }
1982
1983 #if EV_PERIODIC_ENABLE
1984 if (periodiccnt)
1985 {
1986 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
1987 if (waittime > to) waittime = to;
1988 }
1989 #endif
1990
1991 if (expect_false (waittime < timeout_blocktime))
1992 waittime = timeout_blocktime;
1993
1994 sleeptime = waittime - backend_fudge;
1995
1996 if (expect_true (sleeptime > io_blocktime))
1997 sleeptime = io_blocktime;
1998
1999 if (sleeptime)
2000 {
2001 ev_sleep (sleeptime);
2002 waittime -= sleeptime;
2003 }
2004 }
2005
2006 ++loop_count;
2007 backend_poll (EV_A_ waittime);
2008
2009 /* update ev_rt_now, do magic */
2010 time_update (EV_A_ waittime + sleeptime);
2011 }
2012
2013 /* queue pending timers and reschedule them */
2014 timers_reify (EV_A); /* relative timers called last */
2015 #if EV_PERIODIC_ENABLE
2016 periodics_reify (EV_A); /* absolute timers called first */
2017 #endif
2018
2019 #if EV_IDLE_ENABLE
2020 /* queue idle watchers unless other events are pending */
2021 idle_reify (EV_A);
2022 #endif
2023
2024 /* queue check watchers, to be executed first */
2025 if (expect_false (checkcnt))
2026 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2027
2028 call_pending (EV_A);
2029 }
2030 while (expect_true (
2031 activecnt
2032 && !loop_done
2033 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2034 ));
2035
2036 if (loop_done == EVUNLOOP_ONE)
2037 loop_done = EVUNLOOP_CANCEL;
2038 }
2039
2040 void
2041 ev_unloop (EV_P_ int how)
2042 {
2043 loop_done = how;
2044 }
2045
2046 /*****************************************************************************/
2047
2048 void inline_size
2049 wlist_add (WL *head, WL elem)
2050 {
2051 elem->next = *head;
2052 *head = elem;
2053 }
2054
2055 void inline_size
2056 wlist_del (WL *head, WL elem)
2057 {
2058 while (*head)
2059 {
2060 if (*head == elem)
2061 {
2062 *head = elem->next;
2063 return;
2064 }
2065
2066 head = &(*head)->next;
2067 }
2068 }
2069
2070 void inline_speed
2071 clear_pending (EV_P_ W w)
2072 {
2073 if (w->pending)
2074 {
2075 pendings [ABSPRI (w)][w->pending - 1].w = 0;
2076 w->pending = 0;
2077 }
2078 }
2079
2080 int
2081 ev_clear_pending (EV_P_ void *w)
2082 {
2083 W w_ = (W)w;
2084 int pending = w_->pending;
2085
2086 if (expect_true (pending))
2087 {
2088 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2089 w_->pending = 0;
2090 p->w = 0;
2091 return p->events;
2092 }
2093 else
2094 return 0;
2095 }
2096
2097 void inline_size
2098 pri_adjust (EV_P_ W w)
2099 {
2100 int pri = w->priority;
2101 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2102 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2103 w->priority = pri;
2104 }
2105
2106 void inline_speed
2107 ev_start (EV_P_ W w, int active)
2108 {
2109 pri_adjust (EV_A_ w);
2110 w->active = active;
2111 ev_ref (EV_A);
2112 }
2113
2114 void inline_size
2115 ev_stop (EV_P_ W w)
2116 {
2117 ev_unref (EV_A);
2118 w->active = 0;
2119 }
2120
2121 /*****************************************************************************/
2122
2123 void noinline
2124 ev_io_start (EV_P_ ev_io *w)
2125 {
2126 int fd = w->fd;
2127
2128 if (expect_false (ev_is_active (w)))
2129 return;
2130
2131 assert (("ev_io_start called with negative fd", fd >= 0));
2132
2133 EV_FREQUENT_CHECK;
2134
2135 ev_start (EV_A_ (W)w, 1);
2136 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
2137 wlist_add (&anfds[fd].head, (WL)w);
2138
2139 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
2140 w->events &= ~EV_IOFDSET;
2141
2142 EV_FREQUENT_CHECK;
2143 }
2144
2145 void noinline
2146 ev_io_stop (EV_P_ ev_io *w)
2147 {
2148 clear_pending (EV_A_ (W)w);
2149 if (expect_false (!ev_is_active (w)))
2150 return;
2151
2152 assert (("ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2153
2154 EV_FREQUENT_CHECK;
2155
2156 wlist_del (&anfds[w->fd].head, (WL)w);
2157 ev_stop (EV_A_ (W)w);
2158
2159 fd_change (EV_A_ w->fd, 1);
2160
2161 EV_FREQUENT_CHECK;
2162 }
2163
2164 void noinline
2165 ev_timer_start (EV_P_ ev_timer *w)
2166 {
2167 if (expect_false (ev_is_active (w)))
2168 return;
2169
2170 ev_at (w) += mn_now;
2171
2172 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2173
2174 EV_FREQUENT_CHECK;
2175
2176 ++timercnt;
2177 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2178 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2179 ANHE_w (timers [ev_active (w)]) = (WT)w;
2180 ANHE_at_cache (timers [ev_active (w)]);
2181 upheap (timers, ev_active (w));
2182
2183 EV_FREQUENT_CHECK;
2184
2185 /*assert (("internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2186 }
2187
2188 void noinline
2189 ev_timer_stop (EV_P_ ev_timer *w)
2190 {
2191 clear_pending (EV_A_ (W)w);
2192 if (expect_false (!ev_is_active (w)))
2193 return;
2194
2195 EV_FREQUENT_CHECK;
2196
2197 {
2198 int active = ev_active (w);
2199
2200 assert (("internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2201
2202 --timercnt;
2203
2204 if (expect_true (active < timercnt + HEAP0))
2205 {
2206 timers [active] = timers [timercnt + HEAP0];
2207 adjustheap (timers, timercnt, active);
2208 }
2209 }
2210
2211 EV_FREQUENT_CHECK;
2212
2213 ev_at (w) -= mn_now;
2214
2215 ev_stop (EV_A_ (W)w);
2216 }
2217
2218 void noinline
2219 ev_timer_again (EV_P_ ev_timer *w)
2220 {
2221 EV_FREQUENT_CHECK;
2222
2223 if (ev_is_active (w))
2224 {
2225 if (w->repeat)
2226 {
2227 ev_at (w) = mn_now + w->repeat;
2228 ANHE_at_cache (timers [ev_active (w)]);
2229 adjustheap (timers, timercnt, ev_active (w));
2230 }
2231 else
2232 ev_timer_stop (EV_A_ w);
2233 }
2234 else if (w->repeat)
2235 {
2236 ev_at (w) = w->repeat;
2237 ev_timer_start (EV_A_ w);
2238 }
2239
2240 EV_FREQUENT_CHECK;
2241 }
2242
2243 #if EV_PERIODIC_ENABLE
2244 void noinline
2245 ev_periodic_start (EV_P_ ev_periodic *w)
2246 {
2247 if (expect_false (ev_is_active (w)))
2248 return;
2249
2250 if (w->reschedule_cb)
2251 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2252 else if (w->interval)
2253 {
2254 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
2255 /* this formula differs from the one in periodic_reify because we do not always round up */
2256 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2257 }
2258 else
2259 ev_at (w) = w->offset;
2260
2261 EV_FREQUENT_CHECK;
2262
2263 ++periodiccnt;
2264 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2265 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2266 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2267 ANHE_at_cache (periodics [ev_active (w)]);
2268 upheap (periodics, ev_active (w));
2269
2270 EV_FREQUENT_CHECK;
2271
2272 /*assert (("internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2273 }
2274
2275 void noinline
2276 ev_periodic_stop (EV_P_ ev_periodic *w)
2277 {
2278 clear_pending (EV_A_ (W)w);
2279 if (expect_false (!ev_is_active (w)))
2280 return;
2281
2282 EV_FREQUENT_CHECK;
2283
2284 {
2285 int active = ev_active (w);
2286
2287 assert (("internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2288
2289 --periodiccnt;
2290
2291 if (expect_true (active < periodiccnt + HEAP0))
2292 {
2293 periodics [active] = periodics [periodiccnt + HEAP0];
2294 adjustheap (periodics, periodiccnt, active);
2295 }
2296 }
2297
2298 EV_FREQUENT_CHECK;
2299
2300 ev_stop (EV_A_ (W)w);
2301 }
2302
2303 void noinline
2304 ev_periodic_again (EV_P_ ev_periodic *w)
2305 {
2306 /* TODO: use adjustheap and recalculation */
2307 ev_periodic_stop (EV_A_ w);
2308 ev_periodic_start (EV_A_ w);
2309 }
2310 #endif
2311
2312 #ifndef SA_RESTART
2313 # define SA_RESTART 0
2314 #endif
2315
2316 void noinline
2317 ev_signal_start (EV_P_ ev_signal *w)
2318 {
2319 #if EV_MULTIPLICITY
2320 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2321 #endif
2322 if (expect_false (ev_is_active (w)))
2323 return;
2324
2325 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2326
2327 evpipe_init (EV_A);
2328
2329 EV_FREQUENT_CHECK;
2330
2331 {
2332 #ifndef _WIN32
2333 sigset_t full, prev;
2334 sigfillset (&full);
2335 sigprocmask (SIG_SETMASK, &full, &prev);
2336 #endif
2337
2338 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2339
2340 #ifndef _WIN32
2341 sigprocmask (SIG_SETMASK, &prev, 0);
2342 #endif
2343 }
2344
2345 ev_start (EV_A_ (W)w, 1);
2346 wlist_add (&signals [w->signum - 1].head, (WL)w);
2347
2348 if (!((WL)w)->next)
2349 {
2350 #if _WIN32
2351 signal (w->signum, ev_sighandler);
2352 #else
2353 struct sigaction sa;
2354 sa.sa_handler = ev_sighandler;
2355 sigfillset (&sa.sa_mask);
2356 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2357 sigaction (w->signum, &sa, 0);
2358 #endif
2359 }
2360
2361 EV_FREQUENT_CHECK;
2362 }
2363
2364 void noinline
2365 ev_signal_stop (EV_P_ ev_signal *w)
2366 {
2367 clear_pending (EV_A_ (W)w);
2368 if (expect_false (!ev_is_active (w)))
2369 return;
2370
2371 EV_FREQUENT_CHECK;
2372
2373 wlist_del (&signals [w->signum - 1].head, (WL)w);
2374 ev_stop (EV_A_ (W)w);
2375
2376 if (!signals [w->signum - 1].head)
2377 signal (w->signum, SIG_DFL);
2378
2379 EV_FREQUENT_CHECK;
2380 }
2381
2382 void
2383 ev_child_start (EV_P_ ev_child *w)
2384 {
2385 #if EV_MULTIPLICITY
2386 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2387 #endif
2388 if (expect_false (ev_is_active (w)))
2389 return;
2390
2391 EV_FREQUENT_CHECK;
2392
2393 ev_start (EV_A_ (W)w, 1);
2394 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2395
2396 EV_FREQUENT_CHECK;
2397 }
2398
2399 void
2400 ev_child_stop (EV_P_ ev_child *w)
2401 {
2402 clear_pending (EV_A_ (W)w);
2403 if (expect_false (!ev_is_active (w)))
2404 return;
2405
2406 EV_FREQUENT_CHECK;
2407
2408 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2409 ev_stop (EV_A_ (W)w);
2410
2411 EV_FREQUENT_CHECK;
2412 }
2413
2414 #if EV_STAT_ENABLE
2415
2416 # ifdef _WIN32
2417 # undef lstat
2418 # define lstat(a,b) _stati64 (a,b)
2419 # endif
2420
2421 #define DEF_STAT_INTERVAL 5.0074891
2422 #define MIN_STAT_INTERVAL 0.1074891
2423
2424 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2425
2426 #if EV_USE_INOTIFY
2427 # define EV_INOTIFY_BUFSIZE 8192
2428
2429 static void noinline
2430 infy_add (EV_P_ ev_stat *w)
2431 {
2432 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);
2433
2434 if (w->wd < 0)
2435 {
2436 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2437
2438 /* monitor some parent directory for speedup hints */
2439 /* note that exceeding the hardcoded limit is not a correctness issue, */
2440 /* but an efficiency issue only */
2441 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2442 {
2443 char path [4096];
2444 strcpy (path, w->path);
2445
2446 do
2447 {
2448 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2449 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2450
2451 char *pend = strrchr (path, '/');
2452
2453 if (!pend)
2454 break; /* whoops, no '/', complain to your admin */
2455
2456 *pend = 0;
2457 w->wd = inotify_add_watch (fs_fd, path, mask);
2458 }
2459 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2460 }
2461 }
2462 else
2463 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2464
2465 if (w->wd >= 0)
2466 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2467 }
2468
2469 static void noinline
2470 infy_del (EV_P_ ev_stat *w)
2471 {
2472 int slot;
2473 int wd = w->wd;
2474
2475 if (wd < 0)
2476 return;
2477
2478 w->wd = -2;
2479 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2480 wlist_del (&fs_hash [slot].head, (WL)w);
2481
2482 /* remove this watcher, if others are watching it, they will rearm */
2483 inotify_rm_watch (fs_fd, wd);
2484 }
2485
2486 static void noinline
2487 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2488 {
2489 if (slot < 0)
2490 /* overflow, need to check for all hahs slots */
2491 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2492 infy_wd (EV_A_ slot, wd, ev);
2493 else
2494 {
2495 WL w_;
2496
2497 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2498 {
2499 ev_stat *w = (ev_stat *)w_;
2500 w_ = w_->next; /* lets us remove this watcher and all before it */
2501
2502 if (w->wd == wd || wd == -1)
2503 {
2504 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2505 {
2506 w->wd = -1;
2507 infy_add (EV_A_ w); /* re-add, no matter what */
2508 }
2509
2510 stat_timer_cb (EV_A_ &w->timer, 0);
2511 }
2512 }
2513 }
2514 }
2515
2516 static void
2517 infy_cb (EV_P_ ev_io *w, int revents)
2518 {
2519 char buf [EV_INOTIFY_BUFSIZE];
2520 struct inotify_event *ev = (struct inotify_event *)buf;
2521 int ofs;
2522 int len = read (fs_fd, buf, sizeof (buf));
2523
2524 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2525 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2526 }
2527
2528 void inline_size
2529 infy_init (EV_P)
2530 {
2531 if (fs_fd != -2)
2532 return;
2533
2534 fs_fd = inotify_init ();
2535
2536 if (fs_fd >= 0)
2537 {
2538 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2539 ev_set_priority (&fs_w, EV_MAXPRI);
2540 ev_io_start (EV_A_ &fs_w);
2541 }
2542 }
2543
2544 void inline_size
2545 infy_fork (EV_P)
2546 {
2547 int slot;
2548
2549 if (fs_fd < 0)
2550 return;
2551
2552 close (fs_fd);
2553 fs_fd = inotify_init ();
2554
2555 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2556 {
2557 WL w_ = fs_hash [slot].head;
2558 fs_hash [slot].head = 0;
2559
2560 while (w_)
2561 {
2562 ev_stat *w = (ev_stat *)w_;
2563 w_ = w_->next; /* lets us add this watcher */
2564
2565 w->wd = -1;
2566
2567 if (fs_fd >= 0)
2568 infy_add (EV_A_ w); /* re-add, no matter what */
2569 else
2570 ev_timer_start (EV_A_ &w->timer);
2571 }
2572
2573 }
2574 }
2575
2576 #endif
2577
2578 #ifdef _WIN32
2579 # define EV_LSTAT(p,b) _stati64 (p, b)
2580 #else
2581 # define EV_LSTAT(p,b) lstat (p, b)
2582 #endif
2583
2584 void
2585 ev_stat_stat (EV_P_ ev_stat *w)
2586 {
2587 if (lstat (w->path, &w->attr) < 0)
2588 w->attr.st_nlink = 0;
2589 else if (!w->attr.st_nlink)
2590 w->attr.st_nlink = 1;
2591 }
2592
2593 static void noinline
2594 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2595 {
2596 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2597
2598 /* we copy this here each the time so that */
2599 /* prev has the old value when the callback gets invoked */
2600 w->prev = w->attr;
2601 ev_stat_stat (EV_A_ w);
2602
2603 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2604 if (
2605 w->prev.st_dev != w->attr.st_dev
2606 || w->prev.st_ino != w->attr.st_ino
2607 || w->prev.st_mode != w->attr.st_mode
2608 || w->prev.st_nlink != w->attr.st_nlink
2609 || w->prev.st_uid != w->attr.st_uid
2610 || w->prev.st_gid != w->attr.st_gid
2611 || w->prev.st_rdev != w->attr.st_rdev
2612 || w->prev.st_size != w->attr.st_size
2613 || w->prev.st_atime != w->attr.st_atime
2614 || w->prev.st_mtime != w->attr.st_mtime
2615 || w->prev.st_ctime != w->attr.st_ctime
2616 ) {
2617 #if EV_USE_INOTIFY
2618 infy_del (EV_A_ w);
2619 infy_add (EV_A_ w);
2620 ev_stat_stat (EV_A_ w); /* avoid race... */
2621 #endif
2622
2623 ev_feed_event (EV_A_ w, EV_STAT);
2624 }
2625 }
2626
2627 void
2628 ev_stat_start (EV_P_ ev_stat *w)
2629 {
2630 if (expect_false (ev_is_active (w)))
2631 return;
2632
2633 /* since we use memcmp, we need to clear any padding data etc. */
2634 memset (&w->prev, 0, sizeof (ev_statdata));
2635 memset (&w->attr, 0, sizeof (ev_statdata));
2636
2637 ev_stat_stat (EV_A_ w);
2638
2639 if (w->interval < MIN_STAT_INTERVAL)
2640 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2641
2642 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2643 ev_set_priority (&w->timer, ev_priority (w));
2644
2645 #if EV_USE_INOTIFY
2646 infy_init (EV_A);
2647
2648 if (fs_fd >= 0)
2649 infy_add (EV_A_ w);
2650 else
2651 #endif
2652 ev_timer_start (EV_A_ &w->timer);
2653
2654 ev_start (EV_A_ (W)w, 1);
2655
2656 EV_FREQUENT_CHECK;
2657 }
2658
2659 void
2660 ev_stat_stop (EV_P_ ev_stat *w)
2661 {
2662 clear_pending (EV_A_ (W)w);
2663 if (expect_false (!ev_is_active (w)))
2664 return;
2665
2666 EV_FREQUENT_CHECK;
2667
2668 #if EV_USE_INOTIFY
2669 infy_del (EV_A_ w);
2670 #endif
2671 ev_timer_stop (EV_A_ &w->timer);
2672
2673 ev_stop (EV_A_ (W)w);
2674
2675 EV_FREQUENT_CHECK;
2676 }
2677 #endif
2678
2679 #if EV_IDLE_ENABLE
2680 void
2681 ev_idle_start (EV_P_ ev_idle *w)
2682 {
2683 if (expect_false (ev_is_active (w)))
2684 return;
2685
2686 pri_adjust (EV_A_ (W)w);
2687
2688 EV_FREQUENT_CHECK;
2689
2690 {
2691 int active = ++idlecnt [ABSPRI (w)];
2692
2693 ++idleall;
2694 ev_start (EV_A_ (W)w, active);
2695
2696 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2697 idles [ABSPRI (w)][active - 1] = w;
2698 }
2699
2700 EV_FREQUENT_CHECK;
2701 }
2702
2703 void
2704 ev_idle_stop (EV_P_ ev_idle *w)
2705 {
2706 clear_pending (EV_A_ (W)w);
2707 if (expect_false (!ev_is_active (w)))
2708 return;
2709
2710 EV_FREQUENT_CHECK;
2711
2712 {
2713 int active = ev_active (w);
2714
2715 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2716 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2717
2718 ev_stop (EV_A_ (W)w);
2719 --idleall;
2720 }
2721
2722 EV_FREQUENT_CHECK;
2723 }
2724 #endif
2725
2726 void
2727 ev_prepare_start (EV_P_ ev_prepare *w)
2728 {
2729 if (expect_false (ev_is_active (w)))
2730 return;
2731
2732 EV_FREQUENT_CHECK;
2733
2734 ev_start (EV_A_ (W)w, ++preparecnt);
2735 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2736 prepares [preparecnt - 1] = w;
2737
2738 EV_FREQUENT_CHECK;
2739 }
2740
2741 void
2742 ev_prepare_stop (EV_P_ ev_prepare *w)
2743 {
2744 clear_pending (EV_A_ (W)w);
2745 if (expect_false (!ev_is_active (w)))
2746 return;
2747
2748 EV_FREQUENT_CHECK;
2749
2750 {
2751 int active = ev_active (w);
2752
2753 prepares [active - 1] = prepares [--preparecnt];
2754 ev_active (prepares [active - 1]) = active;
2755 }
2756
2757 ev_stop (EV_A_ (W)w);
2758
2759 EV_FREQUENT_CHECK;
2760 }
2761
2762 void
2763 ev_check_start (EV_P_ ev_check *w)
2764 {
2765 if (expect_false (ev_is_active (w)))
2766 return;
2767
2768 EV_FREQUENT_CHECK;
2769
2770 ev_start (EV_A_ (W)w, ++checkcnt);
2771 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2772 checks [checkcnt - 1] = w;
2773
2774 EV_FREQUENT_CHECK;
2775 }
2776
2777 void
2778 ev_check_stop (EV_P_ ev_check *w)
2779 {
2780 clear_pending (EV_A_ (W)w);
2781 if (expect_false (!ev_is_active (w)))
2782 return;
2783
2784 EV_FREQUENT_CHECK;
2785
2786 {
2787 int active = ev_active (w);
2788
2789 checks [active - 1] = checks [--checkcnt];
2790 ev_active (checks [active - 1]) = active;
2791 }
2792
2793 ev_stop (EV_A_ (W)w);
2794
2795 EV_FREQUENT_CHECK;
2796 }
2797
2798 #if EV_EMBED_ENABLE
2799 void noinline
2800 ev_embed_sweep (EV_P_ ev_embed *w)
2801 {
2802 ev_loop (w->other, EVLOOP_NONBLOCK);
2803 }
2804
2805 static void
2806 embed_io_cb (EV_P_ ev_io *io, int revents)
2807 {
2808 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2809
2810 if (ev_cb (w))
2811 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2812 else
2813 ev_loop (w->other, EVLOOP_NONBLOCK);
2814 }
2815
2816 static void
2817 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2818 {
2819 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2820
2821 {
2822 struct ev_loop *loop = w->other;
2823
2824 while (fdchangecnt)
2825 {
2826 fd_reify (EV_A);
2827 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2828 }
2829 }
2830 }
2831
2832 #if 0
2833 static void
2834 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2835 {
2836 ev_idle_stop (EV_A_ idle);
2837 }
2838 #endif
2839
2840 void
2841 ev_embed_start (EV_P_ ev_embed *w)
2842 {
2843 if (expect_false (ev_is_active (w)))
2844 return;
2845
2846 {
2847 struct ev_loop *loop = w->other;
2848 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2849 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2850 }
2851
2852 EV_FREQUENT_CHECK;
2853
2854 ev_set_priority (&w->io, ev_priority (w));
2855 ev_io_start (EV_A_ &w->io);
2856
2857 ev_prepare_init (&w->prepare, embed_prepare_cb);
2858 ev_set_priority (&w->prepare, EV_MINPRI);
2859 ev_prepare_start (EV_A_ &w->prepare);
2860
2861 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2862
2863 ev_start (EV_A_ (W)w, 1);
2864
2865 EV_FREQUENT_CHECK;
2866 }
2867
2868 void
2869 ev_embed_stop (EV_P_ ev_embed *w)
2870 {
2871 clear_pending (EV_A_ (W)w);
2872 if (expect_false (!ev_is_active (w)))
2873 return;
2874
2875 EV_FREQUENT_CHECK;
2876
2877 ev_io_stop (EV_A_ &w->io);
2878 ev_prepare_stop (EV_A_ &w->prepare);
2879
2880 ev_stop (EV_A_ (W)w);
2881
2882 EV_FREQUENT_CHECK;
2883 }
2884 #endif
2885
2886 #if EV_FORK_ENABLE
2887 void
2888 ev_fork_start (EV_P_ ev_fork *w)
2889 {
2890 if (expect_false (ev_is_active (w)))
2891 return;
2892
2893 EV_FREQUENT_CHECK;
2894
2895 ev_start (EV_A_ (W)w, ++forkcnt);
2896 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2897 forks [forkcnt - 1] = w;
2898
2899 EV_FREQUENT_CHECK;
2900 }
2901
2902 void
2903 ev_fork_stop (EV_P_ ev_fork *w)
2904 {
2905 clear_pending (EV_A_ (W)w);
2906 if (expect_false (!ev_is_active (w)))
2907 return;
2908
2909 EV_FREQUENT_CHECK;
2910
2911 {
2912 int active = ev_active (w);
2913
2914 forks [active - 1] = forks [--forkcnt];
2915 ev_active (forks [active - 1]) = active;
2916 }
2917
2918 ev_stop (EV_A_ (W)w);
2919
2920 EV_FREQUENT_CHECK;
2921 }
2922 #endif
2923
2924 #if EV_ASYNC_ENABLE
2925 void
2926 ev_async_start (EV_P_ ev_async *w)
2927 {
2928 if (expect_false (ev_is_active (w)))
2929 return;
2930
2931 evpipe_init (EV_A);
2932
2933 EV_FREQUENT_CHECK;
2934
2935 ev_start (EV_A_ (W)w, ++asynccnt);
2936 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2937 asyncs [asynccnt - 1] = w;
2938
2939 EV_FREQUENT_CHECK;
2940 }
2941
2942 void
2943 ev_async_stop (EV_P_ ev_async *w)
2944 {
2945 clear_pending (EV_A_ (W)w);
2946 if (expect_false (!ev_is_active (w)))
2947 return;
2948
2949 EV_FREQUENT_CHECK;
2950
2951 {
2952 int active = ev_active (w);
2953
2954 asyncs [active - 1] = asyncs [--asynccnt];
2955 ev_active (asyncs [active - 1]) = active;
2956 }
2957
2958 ev_stop (EV_A_ (W)w);
2959
2960 EV_FREQUENT_CHECK;
2961 }
2962
2963 void
2964 ev_async_send (EV_P_ ev_async *w)
2965 {
2966 w->sent = 1;
2967 evpipe_write (EV_A_ &gotasync);
2968 }
2969 #endif
2970
2971 /*****************************************************************************/
2972
2973 struct ev_once
2974 {
2975 ev_io io;
2976 ev_timer to;
2977 void (*cb)(int revents, void *arg);
2978 void *arg;
2979 };
2980
2981 static void
2982 once_cb (EV_P_ struct ev_once *once, int revents)
2983 {
2984 void (*cb)(int revents, void *arg) = once->cb;
2985 void *arg = once->arg;
2986
2987 ev_io_stop (EV_A_ &once->io);
2988 ev_timer_stop (EV_A_ &once->to);
2989 ev_free (once);
2990
2991 cb (revents, arg);
2992 }
2993
2994 static void
2995 once_cb_io (EV_P_ ev_io *w, int revents)
2996 {
2997 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2998 }
2999
3000 static void
3001 once_cb_to (EV_P_ ev_timer *w, int revents)
3002 {
3003 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
3004 }
3005
3006 void
3007 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3008 {
3009 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3010
3011 if (expect_false (!once))
3012 {
3013 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3014 return;
3015 }
3016
3017 once->cb = cb;
3018 once->arg = arg;
3019
3020 ev_init (&once->io, once_cb_io);
3021 if (fd >= 0)
3022 {
3023 ev_io_set (&once->io, fd, events);
3024 ev_io_start (EV_A_ &once->io);
3025 }
3026
3027 ev_init (&once->to, once_cb_to);
3028 if (timeout >= 0.)
3029 {
3030 ev_timer_set (&once->to, timeout, 0.);
3031 ev_timer_start (EV_A_ &once->to);
3032 }
3033 }
3034
3035 #if EV_MULTIPLICITY
3036 #include "ev_wrap.h"
3037 #endif
3038
3039 #ifdef __cplusplus
3040 }
3041 #endif
3042