ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev.c
Revision: 1.263
Committed: Wed Oct 1 18:50:03 2008 UTC (15 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.262: +5 -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 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
293 # ifndef IN_DONT_FOLLOW
294 # undef EV_USE_INOTIFY
295 # define EV_USE_INOTIFY 0
296 # endif
297 #endif
298
299 #if EV_SELECT_IS_WINSOCKET
300 # include <winsock.h>
301 #endif
302
303 #if EV_USE_EVENTFD
304 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
305 # include <stdint.h>
306 # ifdef __cplusplus
307 extern "C" {
308 # endif
309 int eventfd (unsigned int initval, int flags);
310 # ifdef __cplusplus
311 }
312 # endif
313 #endif
314
315 /**/
316
317 #if EV_VERIFY >= 3
318 # define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
319 #else
320 # define EV_FREQUENT_CHECK do { } while (0)
321 #endif
322
323 /*
324 * This is used to avoid floating point rounding problems.
325 * It is added to ev_rt_now when scheduling periodics
326 * to ensure progress, time-wise, even when rounding
327 * errors are against us.
328 * This value is good at least till the year 4000.
329 * Better solutions welcome.
330 */
331 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
332
333 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
334 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
335 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
336
337 #if __GNUC__ >= 4
338 # define expect(expr,value) __builtin_expect ((expr),(value))
339 # define noinline __attribute__ ((noinline))
340 #else
341 # define expect(expr,value) (expr)
342 # define noinline
343 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
344 # define inline
345 # endif
346 #endif
347
348 #define expect_false(expr) expect ((expr) != 0, 0)
349 #define expect_true(expr) expect ((expr) != 0, 1)
350 #define inline_size static inline
351
352 #if EV_MINIMAL
353 # define inline_speed static noinline
354 #else
355 # define inline_speed static inline
356 #endif
357
358 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
359 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
360
361 #define EMPTY /* required for microsofts broken pseudo-c compiler */
362 #define EMPTY2(a,b) /* used to suppress some warnings */
363
364 typedef ev_watcher *W;
365 typedef ev_watcher_list *WL;
366 typedef ev_watcher_time *WT;
367
368 #define ev_active(w) ((W)(w))->active
369 #define ev_at(w) ((WT)(w))->at
370
371 #if EV_USE_MONOTONIC
372 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
373 /* giving it a reasonably high chance of working on typical architetcures */
374 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
375 #endif
376
377 #ifdef _WIN32
378 # include "ev_win32.c"
379 #endif
380
381 /*****************************************************************************/
382
383 static void (*syserr_cb)(const char *msg);
384
385 void
386 ev_set_syserr_cb (void (*cb)(const char *msg))
387 {
388 syserr_cb = cb;
389 }
390
391 static void noinline
392 syserr (const char *msg)
393 {
394 if (!msg)
395 msg = "(libev) system error";
396
397 if (syserr_cb)
398 syserr_cb (msg);
399 else
400 {
401 perror (msg);
402 abort ();
403 }
404 }
405
406 static void *
407 ev_realloc_emul (void *ptr, long size)
408 {
409 /* some systems, notably openbsd and darwin, fail to properly
410 * implement realloc (x, 0) (as required by both ansi c-98 and
411 * the single unix specification, so work around them here.
412 */
413
414 if (size)
415 return realloc (ptr, size);
416
417 free (ptr);
418 return 0;
419 }
420
421 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
422
423 void
424 ev_set_allocator (void *(*cb)(void *ptr, long size))
425 {
426 alloc = cb;
427 }
428
429 inline_speed void *
430 ev_realloc (void *ptr, long size)
431 {
432 ptr = alloc (ptr, size);
433
434 if (!ptr && size)
435 {
436 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
437 abort ();
438 }
439
440 return ptr;
441 }
442
443 #define ev_malloc(size) ev_realloc (0, (size))
444 #define ev_free(ptr) ev_realloc ((ptr), 0)
445
446 /*****************************************************************************/
447
448 typedef struct
449 {
450 WL head;
451 unsigned char events;
452 unsigned char reify;
453 #if EV_SELECT_IS_WINSOCKET
454 SOCKET handle;
455 #endif
456 } ANFD;
457
458 typedef struct
459 {
460 W w;
461 int events;
462 } ANPENDING;
463
464 #if EV_USE_INOTIFY
465 /* hash table entry per inotify-id */
466 typedef struct
467 {
468 WL head;
469 } ANFS;
470 #endif
471
472 /* Heap Entry */
473 #if EV_HEAP_CACHE_AT
474 typedef struct {
475 ev_tstamp at;
476 WT w;
477 } ANHE;
478
479 #define ANHE_w(he) (he).w /* access watcher, read-write */
480 #define ANHE_at(he) (he).at /* access cached at, read-only */
481 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
482 #else
483 typedef WT ANHE;
484
485 #define ANHE_w(he) (he)
486 #define ANHE_at(he) (he)->at
487 #define ANHE_at_cache(he)
488 #endif
489
490 #if EV_MULTIPLICITY
491
492 struct ev_loop
493 {
494 ev_tstamp ev_rt_now;
495 #define ev_rt_now ((loop)->ev_rt_now)
496 #define VAR(name,decl) decl;
497 #include "ev_vars.h"
498 #undef VAR
499 };
500 #include "ev_wrap.h"
501
502 static struct ev_loop default_loop_struct;
503 struct ev_loop *ev_default_loop_ptr;
504
505 #else
506
507 ev_tstamp ev_rt_now;
508 #define VAR(name,decl) static decl;
509 #include "ev_vars.h"
510 #undef VAR
511
512 static int ev_default_loop_ptr;
513
514 #endif
515
516 /*****************************************************************************/
517
518 ev_tstamp
519 ev_time (void)
520 {
521 #if EV_USE_REALTIME
522 struct timespec ts;
523 clock_gettime (CLOCK_REALTIME, &ts);
524 return ts.tv_sec + ts.tv_nsec * 1e-9;
525 #else
526 struct timeval tv;
527 gettimeofday (&tv, 0);
528 return tv.tv_sec + tv.tv_usec * 1e-6;
529 #endif
530 }
531
532 ev_tstamp inline_size
533 get_clock (void)
534 {
535 #if EV_USE_MONOTONIC
536 if (expect_true (have_monotonic))
537 {
538 struct timespec ts;
539 clock_gettime (CLOCK_MONOTONIC, &ts);
540 return ts.tv_sec + ts.tv_nsec * 1e-9;
541 }
542 #endif
543
544 return ev_time ();
545 }
546
547 #if EV_MULTIPLICITY
548 ev_tstamp
549 ev_now (EV_P)
550 {
551 return ev_rt_now;
552 }
553 #endif
554
555 void
556 ev_sleep (ev_tstamp delay)
557 {
558 if (delay > 0.)
559 {
560 #if EV_USE_NANOSLEEP
561 struct timespec ts;
562
563 ts.tv_sec = (time_t)delay;
564 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
565
566 nanosleep (&ts, 0);
567 #elif defined(_WIN32)
568 Sleep ((unsigned long)(delay * 1e3));
569 #else
570 struct timeval tv;
571
572 tv.tv_sec = (time_t)delay;
573 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
574
575 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
576 /* somehting nto guaranteed by newer posix versions, but guaranteed */
577 /* by older ones */
578 select (0, 0, 0, 0, &tv);
579 #endif
580 }
581 }
582
583 /*****************************************************************************/
584
585 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
586
587 int inline_size
588 array_nextsize (int elem, int cur, int cnt)
589 {
590 int ncur = cur + 1;
591
592 do
593 ncur <<= 1;
594 while (cnt > ncur);
595
596 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
597 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
598 {
599 ncur *= elem;
600 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
601 ncur = ncur - sizeof (void *) * 4;
602 ncur /= elem;
603 }
604
605 return ncur;
606 }
607
608 static noinline void *
609 array_realloc (int elem, void *base, int *cur, int cnt)
610 {
611 *cur = array_nextsize (elem, *cur, cnt);
612 return ev_realloc (base, elem * *cur);
613 }
614
615 #define array_needsize(type,base,cur,cnt,init) \
616 if (expect_false ((cnt) > (cur))) \
617 { \
618 int ocur_ = (cur); \
619 (base) = (type *)array_realloc \
620 (sizeof (type), (base), &(cur), (cnt)); \
621 init ((base) + (ocur_), (cur) - ocur_); \
622 }
623
624 #if 0
625 #define array_slim(type,stem) \
626 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
627 { \
628 stem ## max = array_roundsize (stem ## cnt >> 1); \
629 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
630 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
631 }
632 #endif
633
634 #define array_free(stem, idx) \
635 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
636
637 /*****************************************************************************/
638
639 void noinline
640 ev_feed_event (EV_P_ void *w, int revents)
641 {
642 W w_ = (W)w;
643 int pri = ABSPRI (w_);
644
645 if (expect_false (w_->pending))
646 pendings [pri][w_->pending - 1].events |= revents;
647 else
648 {
649 w_->pending = ++pendingcnt [pri];
650 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
651 pendings [pri][w_->pending - 1].w = w_;
652 pendings [pri][w_->pending - 1].events = revents;
653 }
654 }
655
656 void inline_speed
657 queue_events (EV_P_ W *events, int eventcnt, int type)
658 {
659 int i;
660
661 for (i = 0; i < eventcnt; ++i)
662 ev_feed_event (EV_A_ events [i], type);
663 }
664
665 /*****************************************************************************/
666
667 void inline_size
668 anfds_init (ANFD *base, int count)
669 {
670 while (count--)
671 {
672 base->head = 0;
673 base->events = EV_NONE;
674 base->reify = 0;
675
676 ++base;
677 }
678 }
679
680 void inline_speed
681 fd_event (EV_P_ int fd, int revents)
682 {
683 ANFD *anfd = anfds + fd;
684 ev_io *w;
685
686 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
687 {
688 int ev = w->events & revents;
689
690 if (ev)
691 ev_feed_event (EV_A_ (W)w, ev);
692 }
693 }
694
695 void
696 ev_feed_fd_event (EV_P_ int fd, int revents)
697 {
698 if (fd >= 0 && fd < anfdmax)
699 fd_event (EV_A_ fd, revents);
700 }
701
702 void inline_size
703 fd_reify (EV_P)
704 {
705 int i;
706
707 for (i = 0; i < fdchangecnt; ++i)
708 {
709 int fd = fdchanges [i];
710 ANFD *anfd = anfds + fd;
711 ev_io *w;
712
713 unsigned char events = 0;
714
715 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
716 events |= (unsigned char)w->events;
717
718 #if EV_SELECT_IS_WINSOCKET
719 if (events)
720 {
721 unsigned long arg;
722 #ifdef EV_FD_TO_WIN32_HANDLE
723 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
724 #else
725 anfd->handle = _get_osfhandle (fd);
726 #endif
727 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
728 }
729 #endif
730
731 {
732 unsigned char o_events = anfd->events;
733 unsigned char o_reify = anfd->reify;
734
735 anfd->reify = 0;
736 anfd->events = events;
737
738 if (o_events != events || o_reify & EV_IOFDSET)
739 backend_modify (EV_A_ fd, o_events, events);
740 }
741 }
742
743 fdchangecnt = 0;
744 }
745
746 void inline_size
747 fd_change (EV_P_ int fd, int flags)
748 {
749 unsigned char reify = anfds [fd].reify;
750 anfds [fd].reify |= flags;
751
752 if (expect_true (!reify))
753 {
754 ++fdchangecnt;
755 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
756 fdchanges [fdchangecnt - 1] = fd;
757 }
758 }
759
760 void inline_speed
761 fd_kill (EV_P_ int fd)
762 {
763 ev_io *w;
764
765 while ((w = (ev_io *)anfds [fd].head))
766 {
767 ev_io_stop (EV_A_ w);
768 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
769 }
770 }
771
772 int inline_size
773 fd_valid (int fd)
774 {
775 #ifdef _WIN32
776 return _get_osfhandle (fd) != -1;
777 #else
778 return fcntl (fd, F_GETFD) != -1;
779 #endif
780 }
781
782 /* called on EBADF to verify fds */
783 static void noinline
784 fd_ebadf (EV_P)
785 {
786 int fd;
787
788 for (fd = 0; fd < anfdmax; ++fd)
789 if (anfds [fd].events)
790 if (!fd_valid (fd) && errno == EBADF)
791 fd_kill (EV_A_ fd);
792 }
793
794 /* called on ENOMEM in select/poll to kill some fds and retry */
795 static void noinline
796 fd_enomem (EV_P)
797 {
798 int fd;
799
800 for (fd = anfdmax; fd--; )
801 if (anfds [fd].events)
802 {
803 fd_kill (EV_A_ fd);
804 return;
805 }
806 }
807
808 /* usually called after fork if backend needs to re-arm all fds from scratch */
809 static void noinline
810 fd_rearm_all (EV_P)
811 {
812 int fd;
813
814 for (fd = 0; fd < anfdmax; ++fd)
815 if (anfds [fd].events)
816 {
817 anfds [fd].events = 0;
818 fd_change (EV_A_ fd, EV_IOFDSET | 1);
819 }
820 }
821
822 /*****************************************************************************/
823
824 /*
825 * the heap functions want a real array index. array index 0 uis guaranteed to not
826 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
827 * the branching factor of the d-tree.
828 */
829
830 /*
831 * at the moment we allow libev the luxury of two heaps,
832 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
833 * which is more cache-efficient.
834 * the difference is about 5% with 50000+ watchers.
835 */
836 #if EV_USE_4HEAP
837
838 #define DHEAP 4
839 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
840 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
841 #define UPHEAP_DONE(p,k) ((p) == (k))
842
843 /* away from the root */
844 void inline_speed
845 downheap (ANHE *heap, int N, int k)
846 {
847 ANHE he = heap [k];
848 ANHE *E = heap + N + HEAP0;
849
850 for (;;)
851 {
852 ev_tstamp minat;
853 ANHE *minpos;
854 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
855
856 /* find minimum child */
857 if (expect_true (pos + DHEAP - 1 < E))
858 {
859 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
860 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
861 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
862 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
863 }
864 else if (pos < E)
865 {
866 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
867 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
868 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
869 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
870 }
871 else
872 break;
873
874 if (ANHE_at (he) <= minat)
875 break;
876
877 heap [k] = *minpos;
878 ev_active (ANHE_w (*minpos)) = k;
879
880 k = minpos - heap;
881 }
882
883 heap [k] = he;
884 ev_active (ANHE_w (he)) = k;
885 }
886
887 #else /* 4HEAP */
888
889 #define HEAP0 1
890 #define HPARENT(k) ((k) >> 1)
891 #define UPHEAP_DONE(p,k) (!(p))
892
893 /* away from the root */
894 void inline_speed
895 downheap (ANHE *heap, int N, int k)
896 {
897 ANHE he = heap [k];
898
899 for (;;)
900 {
901 int c = k << 1;
902
903 if (c > N + HEAP0 - 1)
904 break;
905
906 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
907 ? 1 : 0;
908
909 if (ANHE_at (he) <= ANHE_at (heap [c]))
910 break;
911
912 heap [k] = heap [c];
913 ev_active (ANHE_w (heap [k])) = k;
914
915 k = c;
916 }
917
918 heap [k] = he;
919 ev_active (ANHE_w (he)) = k;
920 }
921 #endif
922
923 /* towards the root */
924 void inline_speed
925 upheap (ANHE *heap, int k)
926 {
927 ANHE he = heap [k];
928
929 for (;;)
930 {
931 int p = HPARENT (k);
932
933 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
934 break;
935
936 heap [k] = heap [p];
937 ev_active (ANHE_w (heap [k])) = k;
938 k = p;
939 }
940
941 heap [k] = he;
942 ev_active (ANHE_w (he)) = k;
943 }
944
945 void inline_size
946 adjustheap (ANHE *heap, int N, int k)
947 {
948 if (k > HEAP0 && ANHE_at (heap [HPARENT (k)]) >= ANHE_at (heap [k]))
949 upheap (heap, k);
950 else
951 downheap (heap, N, k);
952 }
953
954 /* rebuild the heap: this function is used only once and executed rarely */
955 void inline_size
956 reheap (ANHE *heap, int N)
957 {
958 int i;
959
960 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
961 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
962 for (i = 0; i < N; ++i)
963 upheap (heap, i + HEAP0);
964 }
965
966 /*****************************************************************************/
967
968 typedef struct
969 {
970 WL head;
971 EV_ATOMIC_T gotsig;
972 } ANSIG;
973
974 static ANSIG *signals;
975 static int signalmax;
976
977 static EV_ATOMIC_T gotsig;
978
979 void inline_size
980 signals_init (ANSIG *base, int count)
981 {
982 while (count--)
983 {
984 base->head = 0;
985 base->gotsig = 0;
986
987 ++base;
988 }
989 }
990
991 /*****************************************************************************/
992
993 void inline_speed
994 fd_intern (int fd)
995 {
996 #ifdef _WIN32
997 unsigned long arg = 1;
998 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
999 #else
1000 fcntl (fd, F_SETFD, FD_CLOEXEC);
1001 fcntl (fd, F_SETFL, O_NONBLOCK);
1002 #endif
1003 }
1004
1005 static void noinline
1006 evpipe_init (EV_P)
1007 {
1008 if (!ev_is_active (&pipeev))
1009 {
1010 #if EV_USE_EVENTFD
1011 if ((evfd = eventfd (0, 0)) >= 0)
1012 {
1013 evpipe [0] = -1;
1014 fd_intern (evfd);
1015 ev_io_set (&pipeev, evfd, EV_READ);
1016 }
1017 else
1018 #endif
1019 {
1020 while (pipe (evpipe))
1021 syserr ("(libev) error creating signal/async pipe");
1022
1023 fd_intern (evpipe [0]);
1024 fd_intern (evpipe [1]);
1025 ev_io_set (&pipeev, evpipe [0], EV_READ);
1026 }
1027
1028 ev_io_start (EV_A_ &pipeev);
1029 ev_unref (EV_A); /* watcher should not keep loop alive */
1030 }
1031 }
1032
1033 void inline_size
1034 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1035 {
1036 if (!*flag)
1037 {
1038 int old_errno = errno; /* save errno because write might clobber it */
1039
1040 *flag = 1;
1041
1042 #if EV_USE_EVENTFD
1043 if (evfd >= 0)
1044 {
1045 uint64_t counter = 1;
1046 write (evfd, &counter, sizeof (uint64_t));
1047 }
1048 else
1049 #endif
1050 write (evpipe [1], &old_errno, 1);
1051
1052 errno = old_errno;
1053 }
1054 }
1055
1056 static void
1057 pipecb (EV_P_ ev_io *iow, int revents)
1058 {
1059 #if EV_USE_EVENTFD
1060 if (evfd >= 0)
1061 {
1062 uint64_t counter;
1063 read (evfd, &counter, sizeof (uint64_t));
1064 }
1065 else
1066 #endif
1067 {
1068 char dummy;
1069 read (evpipe [0], &dummy, 1);
1070 }
1071
1072 if (gotsig && ev_is_default_loop (EV_A))
1073 {
1074 int signum;
1075 gotsig = 0;
1076
1077 for (signum = signalmax; signum--; )
1078 if (signals [signum].gotsig)
1079 ev_feed_signal_event (EV_A_ signum + 1);
1080 }
1081
1082 #if EV_ASYNC_ENABLE
1083 if (gotasync)
1084 {
1085 int i;
1086 gotasync = 0;
1087
1088 for (i = asynccnt; i--; )
1089 if (asyncs [i]->sent)
1090 {
1091 asyncs [i]->sent = 0;
1092 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1093 }
1094 }
1095 #endif
1096 }
1097
1098 /*****************************************************************************/
1099
1100 static void
1101 ev_sighandler (int signum)
1102 {
1103 #if EV_MULTIPLICITY
1104 struct ev_loop *loop = &default_loop_struct;
1105 #endif
1106
1107 #if _WIN32
1108 signal (signum, ev_sighandler);
1109 #endif
1110
1111 signals [signum - 1].gotsig = 1;
1112 evpipe_write (EV_A_ &gotsig);
1113 }
1114
1115 void noinline
1116 ev_feed_signal_event (EV_P_ int signum)
1117 {
1118 WL w;
1119
1120 #if EV_MULTIPLICITY
1121 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1122 #endif
1123
1124 --signum;
1125
1126 if (signum < 0 || signum >= signalmax)
1127 return;
1128
1129 signals [signum].gotsig = 0;
1130
1131 for (w = signals [signum].head; w; w = w->next)
1132 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1133 }
1134
1135 /*****************************************************************************/
1136
1137 static WL childs [EV_PID_HASHSIZE];
1138
1139 #ifndef _WIN32
1140
1141 static ev_signal childev;
1142
1143 #ifndef WIFCONTINUED
1144 # define WIFCONTINUED(status) 0
1145 #endif
1146
1147 void inline_speed
1148 child_reap (EV_P_ int chain, int pid, int status)
1149 {
1150 ev_child *w;
1151 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1152
1153 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1154 {
1155 if ((w->pid == pid || !w->pid)
1156 && (!traced || (w->flags & 1)))
1157 {
1158 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1159 w->rpid = pid;
1160 w->rstatus = status;
1161 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1162 }
1163 }
1164 }
1165
1166 #ifndef WCONTINUED
1167 # define WCONTINUED 0
1168 #endif
1169
1170 static void
1171 childcb (EV_P_ ev_signal *sw, int revents)
1172 {
1173 int pid, status;
1174
1175 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1176 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1177 if (!WCONTINUED
1178 || errno != EINVAL
1179 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1180 return;
1181
1182 /* make sure we are called again until all children have been reaped */
1183 /* we need to do it this way so that the callback gets called before we continue */
1184 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1185
1186 child_reap (EV_A_ pid, pid, status);
1187 if (EV_PID_HASHSIZE > 1)
1188 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1189 }
1190
1191 #endif
1192
1193 /*****************************************************************************/
1194
1195 #if EV_USE_PORT
1196 # include "ev_port.c"
1197 #endif
1198 #if EV_USE_KQUEUE
1199 # include "ev_kqueue.c"
1200 #endif
1201 #if EV_USE_EPOLL
1202 # include "ev_epoll.c"
1203 #endif
1204 #if EV_USE_POLL
1205 # include "ev_poll.c"
1206 #endif
1207 #if EV_USE_SELECT
1208 # include "ev_select.c"
1209 #endif
1210
1211 int
1212 ev_version_major (void)
1213 {
1214 return EV_VERSION_MAJOR;
1215 }
1216
1217 int
1218 ev_version_minor (void)
1219 {
1220 return EV_VERSION_MINOR;
1221 }
1222
1223 /* return true if we are running with elevated privileges and should ignore env variables */
1224 int inline_size
1225 enable_secure (void)
1226 {
1227 #ifdef _WIN32
1228 return 0;
1229 #else
1230 return getuid () != geteuid ()
1231 || getgid () != getegid ();
1232 #endif
1233 }
1234
1235 unsigned int
1236 ev_supported_backends (void)
1237 {
1238 unsigned int flags = 0;
1239
1240 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1241 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1242 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1243 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1244 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1245
1246 return flags;
1247 }
1248
1249 unsigned int
1250 ev_recommended_backends (void)
1251 {
1252 unsigned int flags = ev_supported_backends ();
1253
1254 #ifndef __NetBSD__
1255 /* kqueue is borked on everything but netbsd apparently */
1256 /* it usually doesn't work correctly on anything but sockets and pipes */
1257 flags &= ~EVBACKEND_KQUEUE;
1258 #endif
1259 #ifdef __APPLE__
1260 // flags &= ~EVBACKEND_KQUEUE; for documentation
1261 flags &= ~EVBACKEND_POLL;
1262 #endif
1263
1264 return flags;
1265 }
1266
1267 unsigned int
1268 ev_embeddable_backends (void)
1269 {
1270 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1271
1272 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1273 /* please fix it and tell me how to detect the fix */
1274 flags &= ~EVBACKEND_EPOLL;
1275
1276 return flags;
1277 }
1278
1279 unsigned int
1280 ev_backend (EV_P)
1281 {
1282 return backend;
1283 }
1284
1285 unsigned int
1286 ev_loop_count (EV_P)
1287 {
1288 return loop_count;
1289 }
1290
1291 void
1292 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1293 {
1294 io_blocktime = interval;
1295 }
1296
1297 void
1298 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1299 {
1300 timeout_blocktime = interval;
1301 }
1302
1303 static void noinline
1304 loop_init (EV_P_ unsigned int flags)
1305 {
1306 if (!backend)
1307 {
1308 #if EV_USE_MONOTONIC
1309 {
1310 struct timespec ts;
1311 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1312 have_monotonic = 1;
1313 }
1314 #endif
1315
1316 ev_rt_now = ev_time ();
1317 mn_now = get_clock ();
1318 now_floor = mn_now;
1319 rtmn_diff = ev_rt_now - mn_now;
1320
1321 io_blocktime = 0.;
1322 timeout_blocktime = 0.;
1323 backend = 0;
1324 backend_fd = -1;
1325 gotasync = 0;
1326 #if EV_USE_INOTIFY
1327 fs_fd = -2;
1328 #endif
1329
1330 /* pid check not overridable via env */
1331 #ifndef _WIN32
1332 if (flags & EVFLAG_FORKCHECK)
1333 curpid = getpid ();
1334 #endif
1335
1336 if (!(flags & EVFLAG_NOENV)
1337 && !enable_secure ()
1338 && getenv ("LIBEV_FLAGS"))
1339 flags = atoi (getenv ("LIBEV_FLAGS"));
1340
1341 if (!(flags & 0x0000ffffU))
1342 flags |= ev_recommended_backends ();
1343
1344 #if EV_USE_PORT
1345 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1346 #endif
1347 #if EV_USE_KQUEUE
1348 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1349 #endif
1350 #if EV_USE_EPOLL
1351 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1352 #endif
1353 #if EV_USE_POLL
1354 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1355 #endif
1356 #if EV_USE_SELECT
1357 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1358 #endif
1359
1360 ev_init (&pipeev, pipecb);
1361 ev_set_priority (&pipeev, EV_MAXPRI);
1362 }
1363 }
1364
1365 static void noinline
1366 loop_destroy (EV_P)
1367 {
1368 int i;
1369
1370 if (ev_is_active (&pipeev))
1371 {
1372 ev_ref (EV_A); /* signal watcher */
1373 ev_io_stop (EV_A_ &pipeev);
1374
1375 #if EV_USE_EVENTFD
1376 if (evfd >= 0)
1377 close (evfd);
1378 #endif
1379
1380 if (evpipe [0] >= 0)
1381 {
1382 close (evpipe [0]);
1383 close (evpipe [1]);
1384 }
1385 }
1386
1387 #if EV_USE_INOTIFY
1388 if (fs_fd >= 0)
1389 close (fs_fd);
1390 #endif
1391
1392 if (backend_fd >= 0)
1393 close (backend_fd);
1394
1395 #if EV_USE_PORT
1396 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1397 #endif
1398 #if EV_USE_KQUEUE
1399 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1400 #endif
1401 #if EV_USE_EPOLL
1402 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1403 #endif
1404 #if EV_USE_POLL
1405 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1406 #endif
1407 #if EV_USE_SELECT
1408 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1409 #endif
1410
1411 for (i = NUMPRI; i--; )
1412 {
1413 array_free (pending, [i]);
1414 #if EV_IDLE_ENABLE
1415 array_free (idle, [i]);
1416 #endif
1417 }
1418
1419 ev_free (anfds); anfdmax = 0;
1420
1421 /* have to use the microsoft-never-gets-it-right macro */
1422 array_free (fdchange, EMPTY);
1423 array_free (timer, EMPTY);
1424 #if EV_PERIODIC_ENABLE
1425 array_free (periodic, EMPTY);
1426 #endif
1427 #if EV_FORK_ENABLE
1428 array_free (fork, EMPTY);
1429 #endif
1430 array_free (prepare, EMPTY);
1431 array_free (check, EMPTY);
1432 #if EV_ASYNC_ENABLE
1433 array_free (async, EMPTY);
1434 #endif
1435
1436 backend = 0;
1437 }
1438
1439 #if EV_USE_INOTIFY
1440 void inline_size infy_fork (EV_P);
1441 #endif
1442
1443 void inline_size
1444 loop_fork (EV_P)
1445 {
1446 #if EV_USE_PORT
1447 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1448 #endif
1449 #if EV_USE_KQUEUE
1450 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1451 #endif
1452 #if EV_USE_EPOLL
1453 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1454 #endif
1455 #if EV_USE_INOTIFY
1456 infy_fork (EV_A);
1457 #endif
1458
1459 if (ev_is_active (&pipeev))
1460 {
1461 /* this "locks" the handlers against writing to the pipe */
1462 /* while we modify the fd vars */
1463 gotsig = 1;
1464 #if EV_ASYNC_ENABLE
1465 gotasync = 1;
1466 #endif
1467
1468 ev_ref (EV_A);
1469 ev_io_stop (EV_A_ &pipeev);
1470
1471 #if EV_USE_EVENTFD
1472 if (evfd >= 0)
1473 close (evfd);
1474 #endif
1475
1476 if (evpipe [0] >= 0)
1477 {
1478 close (evpipe [0]);
1479 close (evpipe [1]);
1480 }
1481
1482 evpipe_init (EV_A);
1483 /* now iterate over everything, in case we missed something */
1484 pipecb (EV_A_ &pipeev, EV_READ);
1485 }
1486
1487 postfork = 0;
1488 }
1489
1490 #if EV_MULTIPLICITY
1491
1492 struct ev_loop *
1493 ev_loop_new (unsigned int flags)
1494 {
1495 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1496
1497 memset (loop, 0, sizeof (struct ev_loop));
1498
1499 loop_init (EV_A_ flags);
1500
1501 if (ev_backend (EV_A))
1502 return loop;
1503
1504 return 0;
1505 }
1506
1507 void
1508 ev_loop_destroy (EV_P)
1509 {
1510 loop_destroy (EV_A);
1511 ev_free (loop);
1512 }
1513
1514 void
1515 ev_loop_fork (EV_P)
1516 {
1517 postfork = 1; /* must be in line with ev_default_fork */
1518 }
1519
1520 #if EV_VERIFY
1521 static void noinline
1522 verify_watcher (EV_P_ W w)
1523 {
1524 assert (("watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1525
1526 if (w->pending)
1527 assert (("pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1528 }
1529
1530 static void noinline
1531 verify_heap (EV_P_ ANHE *heap, int N)
1532 {
1533 int i;
1534
1535 for (i = HEAP0; i < N + HEAP0; ++i)
1536 {
1537 assert (("active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1538 assert (("heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1539 assert (("heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1540
1541 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1542 }
1543 }
1544
1545 static void noinline
1546 array_verify (EV_P_ W *ws, int cnt)
1547 {
1548 while (cnt--)
1549 {
1550 assert (("active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1551 verify_watcher (EV_A_ ws [cnt]);
1552 }
1553 }
1554 #endif
1555
1556 void
1557 ev_loop_verify (EV_P)
1558 {
1559 #if EV_VERIFY
1560 int i;
1561 WL w;
1562
1563 assert (activecnt >= -1);
1564
1565 assert (fdchangemax >= fdchangecnt);
1566 for (i = 0; i < fdchangecnt; ++i)
1567 assert (("negative fd in fdchanges", fdchanges [i] >= 0));
1568
1569 assert (anfdmax >= 0);
1570 for (i = 0; i < anfdmax; ++i)
1571 for (w = anfds [i].head; w; w = w->next)
1572 {
1573 verify_watcher (EV_A_ (W)w);
1574 assert (("inactive fd watcher on anfd list", ev_active (w) == 1));
1575 assert (("fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1576 }
1577
1578 assert (timermax >= timercnt);
1579 verify_heap (EV_A_ timers, timercnt);
1580
1581 #if EV_PERIODIC_ENABLE
1582 assert (periodicmax >= periodiccnt);
1583 verify_heap (EV_A_ periodics, periodiccnt);
1584 #endif
1585
1586 for (i = NUMPRI; i--; )
1587 {
1588 assert (pendingmax [i] >= pendingcnt [i]);
1589 #if EV_IDLE_ENABLE
1590 assert (idleall >= 0);
1591 assert (idlemax [i] >= idlecnt [i]);
1592 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1593 #endif
1594 }
1595
1596 #if EV_FORK_ENABLE
1597 assert (forkmax >= forkcnt);
1598 array_verify (EV_A_ (W *)forks, forkcnt);
1599 #endif
1600
1601 #if EV_ASYNC_ENABLE
1602 assert (asyncmax >= asynccnt);
1603 array_verify (EV_A_ (W *)asyncs, asynccnt);
1604 #endif
1605
1606 assert (preparemax >= preparecnt);
1607 array_verify (EV_A_ (W *)prepares, preparecnt);
1608
1609 assert (checkmax >= checkcnt);
1610 array_verify (EV_A_ (W *)checks, checkcnt);
1611
1612 # if 0
1613 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1614 for (signum = signalmax; signum--; ) if (signals [signum].gotsig)
1615 # endif
1616 #endif
1617 }
1618
1619 #endif /* multiplicity */
1620
1621 #if EV_MULTIPLICITY
1622 struct ev_loop *
1623 ev_default_loop_init (unsigned int flags)
1624 #else
1625 int
1626 ev_default_loop (unsigned int flags)
1627 #endif
1628 {
1629 if (!ev_default_loop_ptr)
1630 {
1631 #if EV_MULTIPLICITY
1632 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1633 #else
1634 ev_default_loop_ptr = 1;
1635 #endif
1636
1637 loop_init (EV_A_ flags);
1638
1639 if (ev_backend (EV_A))
1640 {
1641 #ifndef _WIN32
1642 ev_signal_init (&childev, childcb, SIGCHLD);
1643 ev_set_priority (&childev, EV_MAXPRI);
1644 ev_signal_start (EV_A_ &childev);
1645 ev_unref (EV_A); /* child watcher should not keep loop alive */
1646 #endif
1647 }
1648 else
1649 ev_default_loop_ptr = 0;
1650 }
1651
1652 return ev_default_loop_ptr;
1653 }
1654
1655 void
1656 ev_default_destroy (void)
1657 {
1658 #if EV_MULTIPLICITY
1659 struct ev_loop *loop = ev_default_loop_ptr;
1660 #endif
1661
1662 #ifndef _WIN32
1663 ev_ref (EV_A); /* child watcher */
1664 ev_signal_stop (EV_A_ &childev);
1665 #endif
1666
1667 loop_destroy (EV_A);
1668 }
1669
1670 void
1671 ev_default_fork (void)
1672 {
1673 #if EV_MULTIPLICITY
1674 struct ev_loop *loop = ev_default_loop_ptr;
1675 #endif
1676
1677 if (backend)
1678 postfork = 1; /* must be in line with ev_loop_fork */
1679 }
1680
1681 /*****************************************************************************/
1682
1683 void
1684 ev_invoke (EV_P_ void *w, int revents)
1685 {
1686 EV_CB_INVOKE ((W)w, revents);
1687 }
1688
1689 void inline_speed
1690 call_pending (EV_P)
1691 {
1692 int pri;
1693
1694 for (pri = NUMPRI; pri--; )
1695 while (pendingcnt [pri])
1696 {
1697 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1698
1699 if (expect_true (p->w))
1700 {
1701 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1702
1703 p->w->pending = 0;
1704 EV_CB_INVOKE (p->w, p->events);
1705 EV_FREQUENT_CHECK;
1706 }
1707 }
1708 }
1709
1710 #if EV_IDLE_ENABLE
1711 void inline_size
1712 idle_reify (EV_P)
1713 {
1714 if (expect_false (idleall))
1715 {
1716 int pri;
1717
1718 for (pri = NUMPRI; pri--; )
1719 {
1720 if (pendingcnt [pri])
1721 break;
1722
1723 if (idlecnt [pri])
1724 {
1725 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1726 break;
1727 }
1728 }
1729 }
1730 }
1731 #endif
1732
1733 void inline_size
1734 timers_reify (EV_P)
1735 {
1736 EV_FREQUENT_CHECK;
1737
1738 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
1739 {
1740 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
1741
1742 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1743
1744 /* first reschedule or stop timer */
1745 if (w->repeat)
1746 {
1747 ev_at (w) += w->repeat;
1748 if (ev_at (w) < mn_now)
1749 ev_at (w) = mn_now;
1750
1751 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1752
1753 ANHE_at_cache (timers [HEAP0]);
1754 downheap (timers, timercnt, HEAP0);
1755 }
1756 else
1757 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1758
1759 EV_FREQUENT_CHECK;
1760 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1761 }
1762 }
1763
1764 #if EV_PERIODIC_ENABLE
1765 void inline_size
1766 periodics_reify (EV_P)
1767 {
1768 EV_FREQUENT_CHECK;
1769
1770 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
1771 {
1772 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
1773
1774 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1775
1776 /* first reschedule or stop timer */
1777 if (w->reschedule_cb)
1778 {
1779 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1780
1781 assert (("ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
1782
1783 ANHE_at_cache (periodics [HEAP0]);
1784 downheap (periodics, periodiccnt, HEAP0);
1785 }
1786 else if (w->interval)
1787 {
1788 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1789 /* if next trigger time is not sufficiently in the future, put it there */
1790 /* this might happen because of floating point inexactness */
1791 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
1792 {
1793 ev_at (w) += w->interval;
1794
1795 /* if interval is unreasonably low we might still have a time in the past */
1796 /* so correct this. this will make the periodic very inexact, but the user */
1797 /* has effectively asked to get triggered more often than possible */
1798 if (ev_at (w) < ev_rt_now)
1799 ev_at (w) = ev_rt_now;
1800 }
1801
1802 ANHE_at_cache (periodics [HEAP0]);
1803 downheap (periodics, periodiccnt, HEAP0);
1804 }
1805 else
1806 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1807
1808 EV_FREQUENT_CHECK;
1809 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1810 }
1811 }
1812
1813 static void noinline
1814 periodics_reschedule (EV_P)
1815 {
1816 int i;
1817
1818 /* adjust periodics after time jump */
1819 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
1820 {
1821 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
1822
1823 if (w->reschedule_cb)
1824 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1825 else if (w->interval)
1826 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1827
1828 ANHE_at_cache (periodics [i]);
1829 }
1830
1831 reheap (periodics, periodiccnt);
1832 }
1833 #endif
1834
1835 void inline_speed
1836 time_update (EV_P_ ev_tstamp max_block)
1837 {
1838 int i;
1839
1840 #if EV_USE_MONOTONIC
1841 if (expect_true (have_monotonic))
1842 {
1843 ev_tstamp odiff = rtmn_diff;
1844
1845 mn_now = get_clock ();
1846
1847 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1848 /* interpolate in the meantime */
1849 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1850 {
1851 ev_rt_now = rtmn_diff + mn_now;
1852 return;
1853 }
1854
1855 now_floor = mn_now;
1856 ev_rt_now = ev_time ();
1857
1858 /* loop a few times, before making important decisions.
1859 * on the choice of "4": one iteration isn't enough,
1860 * in case we get preempted during the calls to
1861 * ev_time and get_clock. a second call is almost guaranteed
1862 * to succeed in that case, though. and looping a few more times
1863 * doesn't hurt either as we only do this on time-jumps or
1864 * in the unlikely event of having been preempted here.
1865 */
1866 for (i = 4; --i; )
1867 {
1868 rtmn_diff = ev_rt_now - mn_now;
1869
1870 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
1871 return; /* all is well */
1872
1873 ev_rt_now = ev_time ();
1874 mn_now = get_clock ();
1875 now_floor = mn_now;
1876 }
1877
1878 # if EV_PERIODIC_ENABLE
1879 periodics_reschedule (EV_A);
1880 # endif
1881 /* no timer adjustment, as the monotonic clock doesn't jump */
1882 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1883 }
1884 else
1885 #endif
1886 {
1887 ev_rt_now = ev_time ();
1888
1889 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1890 {
1891 #if EV_PERIODIC_ENABLE
1892 periodics_reschedule (EV_A);
1893 #endif
1894 /* adjust timers. this is easy, as the offset is the same for all of them */
1895 for (i = 0; i < timercnt; ++i)
1896 {
1897 ANHE *he = timers + i + HEAP0;
1898 ANHE_w (*he)->at += ev_rt_now - mn_now;
1899 ANHE_at_cache (*he);
1900 }
1901 }
1902
1903 mn_now = ev_rt_now;
1904 }
1905 }
1906
1907 void
1908 ev_ref (EV_P)
1909 {
1910 ++activecnt;
1911 }
1912
1913 void
1914 ev_unref (EV_P)
1915 {
1916 --activecnt;
1917 }
1918
1919 void
1920 ev_now_update (EV_P)
1921 {
1922 time_update (EV_A_ 1e100);
1923 }
1924
1925 static int loop_done;
1926
1927 void
1928 ev_loop (EV_P_ int flags)
1929 {
1930 loop_done = EVUNLOOP_CANCEL;
1931
1932 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1933
1934 do
1935 {
1936 #if EV_VERIFY >= 2
1937 ev_loop_verify (EV_A);
1938 #endif
1939
1940 #ifndef _WIN32
1941 if (expect_false (curpid)) /* penalise the forking check even more */
1942 if (expect_false (getpid () != curpid))
1943 {
1944 curpid = getpid ();
1945 postfork = 1;
1946 }
1947 #endif
1948
1949 #if EV_FORK_ENABLE
1950 /* we might have forked, so queue fork handlers */
1951 if (expect_false (postfork))
1952 if (forkcnt)
1953 {
1954 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1955 call_pending (EV_A);
1956 }
1957 #endif
1958
1959 /* queue prepare watchers (and execute them) */
1960 if (expect_false (preparecnt))
1961 {
1962 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1963 call_pending (EV_A);
1964 }
1965
1966 if (expect_false (!activecnt))
1967 break;
1968
1969 /* we might have forked, so reify kernel state if necessary */
1970 if (expect_false (postfork))
1971 loop_fork (EV_A);
1972
1973 /* update fd-related kernel structures */
1974 fd_reify (EV_A);
1975
1976 /* calculate blocking time */
1977 {
1978 ev_tstamp waittime = 0.;
1979 ev_tstamp sleeptime = 0.;
1980
1981 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
1982 {
1983 /* update time to cancel out callback processing overhead */
1984 time_update (EV_A_ 1e100);
1985
1986 waittime = MAX_BLOCKTIME;
1987
1988 if (timercnt)
1989 {
1990 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
1991 if (waittime > to) waittime = to;
1992 }
1993
1994 #if EV_PERIODIC_ENABLE
1995 if (periodiccnt)
1996 {
1997 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
1998 if (waittime > to) waittime = to;
1999 }
2000 #endif
2001
2002 if (expect_false (waittime < timeout_blocktime))
2003 waittime = timeout_blocktime;
2004
2005 sleeptime = waittime - backend_fudge;
2006
2007 if (expect_true (sleeptime > io_blocktime))
2008 sleeptime = io_blocktime;
2009
2010 if (sleeptime)
2011 {
2012 ev_sleep (sleeptime);
2013 waittime -= sleeptime;
2014 }
2015 }
2016
2017 ++loop_count;
2018 backend_poll (EV_A_ waittime);
2019
2020 /* update ev_rt_now, do magic */
2021 time_update (EV_A_ waittime + sleeptime);
2022 }
2023
2024 /* queue pending timers and reschedule them */
2025 timers_reify (EV_A); /* relative timers called last */
2026 #if EV_PERIODIC_ENABLE
2027 periodics_reify (EV_A); /* absolute timers called first */
2028 #endif
2029
2030 #if EV_IDLE_ENABLE
2031 /* queue idle watchers unless other events are pending */
2032 idle_reify (EV_A);
2033 #endif
2034
2035 /* queue check watchers, to be executed first */
2036 if (expect_false (checkcnt))
2037 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2038
2039 call_pending (EV_A);
2040 }
2041 while (expect_true (
2042 activecnt
2043 && !loop_done
2044 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2045 ));
2046
2047 if (loop_done == EVUNLOOP_ONE)
2048 loop_done = EVUNLOOP_CANCEL;
2049 }
2050
2051 void
2052 ev_unloop (EV_P_ int how)
2053 {
2054 loop_done = how;
2055 }
2056
2057 /*****************************************************************************/
2058
2059 void inline_size
2060 wlist_add (WL *head, WL elem)
2061 {
2062 elem->next = *head;
2063 *head = elem;
2064 }
2065
2066 void inline_size
2067 wlist_del (WL *head, WL elem)
2068 {
2069 while (*head)
2070 {
2071 if (*head == elem)
2072 {
2073 *head = elem->next;
2074 return;
2075 }
2076
2077 head = &(*head)->next;
2078 }
2079 }
2080
2081 void inline_speed
2082 clear_pending (EV_P_ W w)
2083 {
2084 if (w->pending)
2085 {
2086 pendings [ABSPRI (w)][w->pending - 1].w = 0;
2087 w->pending = 0;
2088 }
2089 }
2090
2091 int
2092 ev_clear_pending (EV_P_ void *w)
2093 {
2094 W w_ = (W)w;
2095 int pending = w_->pending;
2096
2097 if (expect_true (pending))
2098 {
2099 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2100 w_->pending = 0;
2101 p->w = 0;
2102 return p->events;
2103 }
2104 else
2105 return 0;
2106 }
2107
2108 void inline_size
2109 pri_adjust (EV_P_ W w)
2110 {
2111 int pri = w->priority;
2112 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2113 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2114 w->priority = pri;
2115 }
2116
2117 void inline_speed
2118 ev_start (EV_P_ W w, int active)
2119 {
2120 pri_adjust (EV_A_ w);
2121 w->active = active;
2122 ev_ref (EV_A);
2123 }
2124
2125 void inline_size
2126 ev_stop (EV_P_ W w)
2127 {
2128 ev_unref (EV_A);
2129 w->active = 0;
2130 }
2131
2132 /*****************************************************************************/
2133
2134 void noinline
2135 ev_io_start (EV_P_ ev_io *w)
2136 {
2137 int fd = w->fd;
2138
2139 if (expect_false (ev_is_active (w)))
2140 return;
2141
2142 assert (("ev_io_start called with negative fd", fd >= 0));
2143
2144 EV_FREQUENT_CHECK;
2145
2146 ev_start (EV_A_ (W)w, 1);
2147 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
2148 wlist_add (&anfds[fd].head, (WL)w);
2149
2150 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
2151 w->events &= ~EV_IOFDSET;
2152
2153 EV_FREQUENT_CHECK;
2154 }
2155
2156 void noinline
2157 ev_io_stop (EV_P_ ev_io *w)
2158 {
2159 clear_pending (EV_A_ (W)w);
2160 if (expect_false (!ev_is_active (w)))
2161 return;
2162
2163 assert (("ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2164
2165 EV_FREQUENT_CHECK;
2166
2167 wlist_del (&anfds[w->fd].head, (WL)w);
2168 ev_stop (EV_A_ (W)w);
2169
2170 fd_change (EV_A_ w->fd, 1);
2171
2172 EV_FREQUENT_CHECK;
2173 }
2174
2175 void noinline
2176 ev_timer_start (EV_P_ ev_timer *w)
2177 {
2178 if (expect_false (ev_is_active (w)))
2179 return;
2180
2181 ev_at (w) += mn_now;
2182
2183 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2184
2185 EV_FREQUENT_CHECK;
2186
2187 ++timercnt;
2188 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2189 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2190 ANHE_w (timers [ev_active (w)]) = (WT)w;
2191 ANHE_at_cache (timers [ev_active (w)]);
2192 upheap (timers, ev_active (w));
2193
2194 EV_FREQUENT_CHECK;
2195
2196 /*assert (("internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2197 }
2198
2199 void noinline
2200 ev_timer_stop (EV_P_ ev_timer *w)
2201 {
2202 clear_pending (EV_A_ (W)w);
2203 if (expect_false (!ev_is_active (w)))
2204 return;
2205
2206 EV_FREQUENT_CHECK;
2207
2208 {
2209 int active = ev_active (w);
2210
2211 assert (("internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2212
2213 --timercnt;
2214
2215 if (expect_true (active < timercnt + HEAP0))
2216 {
2217 timers [active] = timers [timercnt + HEAP0];
2218 adjustheap (timers, timercnt, active);
2219 }
2220 }
2221
2222 EV_FREQUENT_CHECK;
2223
2224 ev_at (w) -= mn_now;
2225
2226 ev_stop (EV_A_ (W)w);
2227 }
2228
2229 void noinline
2230 ev_timer_again (EV_P_ ev_timer *w)
2231 {
2232 EV_FREQUENT_CHECK;
2233
2234 if (ev_is_active (w))
2235 {
2236 if (w->repeat)
2237 {
2238 ev_at (w) = mn_now + w->repeat;
2239 ANHE_at_cache (timers [ev_active (w)]);
2240 adjustheap (timers, timercnt, ev_active (w));
2241 }
2242 else
2243 ev_timer_stop (EV_A_ w);
2244 }
2245 else if (w->repeat)
2246 {
2247 ev_at (w) = w->repeat;
2248 ev_timer_start (EV_A_ w);
2249 }
2250
2251 EV_FREQUENT_CHECK;
2252 }
2253
2254 #if EV_PERIODIC_ENABLE
2255 void noinline
2256 ev_periodic_start (EV_P_ ev_periodic *w)
2257 {
2258 if (expect_false (ev_is_active (w)))
2259 return;
2260
2261 if (w->reschedule_cb)
2262 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2263 else if (w->interval)
2264 {
2265 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
2266 /* this formula differs from the one in periodic_reify because we do not always round up */
2267 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2268 }
2269 else
2270 ev_at (w) = w->offset;
2271
2272 EV_FREQUENT_CHECK;
2273
2274 ++periodiccnt;
2275 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2276 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2277 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2278 ANHE_at_cache (periodics [ev_active (w)]);
2279 upheap (periodics, ev_active (w));
2280
2281 EV_FREQUENT_CHECK;
2282
2283 /*assert (("internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2284 }
2285
2286 void noinline
2287 ev_periodic_stop (EV_P_ ev_periodic *w)
2288 {
2289 clear_pending (EV_A_ (W)w);
2290 if (expect_false (!ev_is_active (w)))
2291 return;
2292
2293 EV_FREQUENT_CHECK;
2294
2295 {
2296 int active = ev_active (w);
2297
2298 assert (("internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2299
2300 --periodiccnt;
2301
2302 if (expect_true (active < periodiccnt + HEAP0))
2303 {
2304 periodics [active] = periodics [periodiccnt + HEAP0];
2305 adjustheap (periodics, periodiccnt, active);
2306 }
2307 }
2308
2309 EV_FREQUENT_CHECK;
2310
2311 ev_stop (EV_A_ (W)w);
2312 }
2313
2314 void noinline
2315 ev_periodic_again (EV_P_ ev_periodic *w)
2316 {
2317 /* TODO: use adjustheap and recalculation */
2318 ev_periodic_stop (EV_A_ w);
2319 ev_periodic_start (EV_A_ w);
2320 }
2321 #endif
2322
2323 #ifndef SA_RESTART
2324 # define SA_RESTART 0
2325 #endif
2326
2327 void noinline
2328 ev_signal_start (EV_P_ ev_signal *w)
2329 {
2330 #if EV_MULTIPLICITY
2331 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2332 #endif
2333 if (expect_false (ev_is_active (w)))
2334 return;
2335
2336 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
2337
2338 evpipe_init (EV_A);
2339
2340 EV_FREQUENT_CHECK;
2341
2342 {
2343 #ifndef _WIN32
2344 sigset_t full, prev;
2345 sigfillset (&full);
2346 sigprocmask (SIG_SETMASK, &full, &prev);
2347 #endif
2348
2349 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
2350
2351 #ifndef _WIN32
2352 sigprocmask (SIG_SETMASK, &prev, 0);
2353 #endif
2354 }
2355
2356 ev_start (EV_A_ (W)w, 1);
2357 wlist_add (&signals [w->signum - 1].head, (WL)w);
2358
2359 if (!((WL)w)->next)
2360 {
2361 #if _WIN32
2362 signal (w->signum, ev_sighandler);
2363 #else
2364 struct sigaction sa;
2365 sa.sa_handler = ev_sighandler;
2366 sigfillset (&sa.sa_mask);
2367 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2368 sigaction (w->signum, &sa, 0);
2369 #endif
2370 }
2371
2372 EV_FREQUENT_CHECK;
2373 }
2374
2375 void noinline
2376 ev_signal_stop (EV_P_ ev_signal *w)
2377 {
2378 clear_pending (EV_A_ (W)w);
2379 if (expect_false (!ev_is_active (w)))
2380 return;
2381
2382 EV_FREQUENT_CHECK;
2383
2384 wlist_del (&signals [w->signum - 1].head, (WL)w);
2385 ev_stop (EV_A_ (W)w);
2386
2387 if (!signals [w->signum - 1].head)
2388 signal (w->signum, SIG_DFL);
2389
2390 EV_FREQUENT_CHECK;
2391 }
2392
2393 void
2394 ev_child_start (EV_P_ ev_child *w)
2395 {
2396 #if EV_MULTIPLICITY
2397 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2398 #endif
2399 if (expect_false (ev_is_active (w)))
2400 return;
2401
2402 EV_FREQUENT_CHECK;
2403
2404 ev_start (EV_A_ (W)w, 1);
2405 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2406
2407 EV_FREQUENT_CHECK;
2408 }
2409
2410 void
2411 ev_child_stop (EV_P_ ev_child *w)
2412 {
2413 clear_pending (EV_A_ (W)w);
2414 if (expect_false (!ev_is_active (w)))
2415 return;
2416
2417 EV_FREQUENT_CHECK;
2418
2419 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2420 ev_stop (EV_A_ (W)w);
2421
2422 EV_FREQUENT_CHECK;
2423 }
2424
2425 #if EV_STAT_ENABLE
2426
2427 # ifdef _WIN32
2428 # undef lstat
2429 # define lstat(a,b) _stati64 (a,b)
2430 # endif
2431
2432 #define DEF_STAT_INTERVAL 5.0074891
2433 #define MIN_STAT_INTERVAL 0.1074891
2434
2435 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2436
2437 #if EV_USE_INOTIFY
2438 # define EV_INOTIFY_BUFSIZE 8192
2439
2440 static void noinline
2441 infy_add (EV_P_ ev_stat *w)
2442 {
2443 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);
2444
2445 if (w->wd < 0)
2446 {
2447 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2448
2449 /* monitor some parent directory for speedup hints */
2450 /* note that exceeding the hardcoded limit is not a correctness issue, */
2451 /* but an efficiency issue only */
2452 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2453 {
2454 char path [4096];
2455 strcpy (path, w->path);
2456
2457 do
2458 {
2459 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2460 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2461
2462 char *pend = strrchr (path, '/');
2463
2464 if (!pend)
2465 break; /* whoops, no '/', complain to your admin */
2466
2467 *pend = 0;
2468 w->wd = inotify_add_watch (fs_fd, path, mask);
2469 }
2470 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2471 }
2472 }
2473 else
2474 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
2475
2476 if (w->wd >= 0)
2477 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2478 }
2479
2480 static void noinline
2481 infy_del (EV_P_ ev_stat *w)
2482 {
2483 int slot;
2484 int wd = w->wd;
2485
2486 if (wd < 0)
2487 return;
2488
2489 w->wd = -2;
2490 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2491 wlist_del (&fs_hash [slot].head, (WL)w);
2492
2493 /* remove this watcher, if others are watching it, they will rearm */
2494 inotify_rm_watch (fs_fd, wd);
2495 }
2496
2497 static void noinline
2498 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2499 {
2500 if (slot < 0)
2501 /* overflow, need to check for all hahs slots */
2502 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2503 infy_wd (EV_A_ slot, wd, ev);
2504 else
2505 {
2506 WL w_;
2507
2508 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2509 {
2510 ev_stat *w = (ev_stat *)w_;
2511 w_ = w_->next; /* lets us remove this watcher and all before it */
2512
2513 if (w->wd == wd || wd == -1)
2514 {
2515 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2516 {
2517 w->wd = -1;
2518 infy_add (EV_A_ w); /* re-add, no matter what */
2519 }
2520
2521 stat_timer_cb (EV_A_ &w->timer, 0);
2522 }
2523 }
2524 }
2525 }
2526
2527 static void
2528 infy_cb (EV_P_ ev_io *w, int revents)
2529 {
2530 char buf [EV_INOTIFY_BUFSIZE];
2531 struct inotify_event *ev = (struct inotify_event *)buf;
2532 int ofs;
2533 int len = read (fs_fd, buf, sizeof (buf));
2534
2535 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2536 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2537 }
2538
2539 void inline_size
2540 infy_init (EV_P)
2541 {
2542 if (fs_fd != -2)
2543 return;
2544
2545 fs_fd = inotify_init ();
2546
2547 if (fs_fd >= 0)
2548 {
2549 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2550 ev_set_priority (&fs_w, EV_MAXPRI);
2551 ev_io_start (EV_A_ &fs_w);
2552 }
2553 }
2554
2555 void inline_size
2556 infy_fork (EV_P)
2557 {
2558 int slot;
2559
2560 if (fs_fd < 0)
2561 return;
2562
2563 close (fs_fd);
2564 fs_fd = inotify_init ();
2565
2566 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2567 {
2568 WL w_ = fs_hash [slot].head;
2569 fs_hash [slot].head = 0;
2570
2571 while (w_)
2572 {
2573 ev_stat *w = (ev_stat *)w_;
2574 w_ = w_->next; /* lets us add this watcher */
2575
2576 w->wd = -1;
2577
2578 if (fs_fd >= 0)
2579 infy_add (EV_A_ w); /* re-add, no matter what */
2580 else
2581 ev_timer_start (EV_A_ &w->timer);
2582 }
2583
2584 }
2585 }
2586
2587 #endif
2588
2589 #ifdef _WIN32
2590 # define EV_LSTAT(p,b) _stati64 (p, b)
2591 #else
2592 # define EV_LSTAT(p,b) lstat (p, b)
2593 #endif
2594
2595 void
2596 ev_stat_stat (EV_P_ ev_stat *w)
2597 {
2598 if (lstat (w->path, &w->attr) < 0)
2599 w->attr.st_nlink = 0;
2600 else if (!w->attr.st_nlink)
2601 w->attr.st_nlink = 1;
2602 }
2603
2604 static void noinline
2605 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2606 {
2607 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2608
2609 /* we copy this here each the time so that */
2610 /* prev has the old value when the callback gets invoked */
2611 w->prev = w->attr;
2612 ev_stat_stat (EV_A_ w);
2613
2614 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2615 if (
2616 w->prev.st_dev != w->attr.st_dev
2617 || w->prev.st_ino != w->attr.st_ino
2618 || w->prev.st_mode != w->attr.st_mode
2619 || w->prev.st_nlink != w->attr.st_nlink
2620 || w->prev.st_uid != w->attr.st_uid
2621 || w->prev.st_gid != w->attr.st_gid
2622 || w->prev.st_rdev != w->attr.st_rdev
2623 || w->prev.st_size != w->attr.st_size
2624 || w->prev.st_atime != w->attr.st_atime
2625 || w->prev.st_mtime != w->attr.st_mtime
2626 || w->prev.st_ctime != w->attr.st_ctime
2627 ) {
2628 #if EV_USE_INOTIFY
2629 infy_del (EV_A_ w);
2630 infy_add (EV_A_ w);
2631 ev_stat_stat (EV_A_ w); /* avoid race... */
2632 #endif
2633
2634 ev_feed_event (EV_A_ w, EV_STAT);
2635 }
2636 }
2637
2638 void
2639 ev_stat_start (EV_P_ ev_stat *w)
2640 {
2641 if (expect_false (ev_is_active (w)))
2642 return;
2643
2644 /* since we use memcmp, we need to clear any padding data etc. */
2645 memset (&w->prev, 0, sizeof (ev_statdata));
2646 memset (&w->attr, 0, sizeof (ev_statdata));
2647
2648 ev_stat_stat (EV_A_ w);
2649
2650 if (w->interval < MIN_STAT_INTERVAL)
2651 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2652
2653 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2654 ev_set_priority (&w->timer, ev_priority (w));
2655
2656 #if EV_USE_INOTIFY
2657 infy_init (EV_A);
2658
2659 if (fs_fd >= 0)
2660 infy_add (EV_A_ w);
2661 else
2662 #endif
2663 ev_timer_start (EV_A_ &w->timer);
2664
2665 ev_start (EV_A_ (W)w, 1);
2666
2667 EV_FREQUENT_CHECK;
2668 }
2669
2670 void
2671 ev_stat_stop (EV_P_ ev_stat *w)
2672 {
2673 clear_pending (EV_A_ (W)w);
2674 if (expect_false (!ev_is_active (w)))
2675 return;
2676
2677 EV_FREQUENT_CHECK;
2678
2679 #if EV_USE_INOTIFY
2680 infy_del (EV_A_ w);
2681 #endif
2682 ev_timer_stop (EV_A_ &w->timer);
2683
2684 ev_stop (EV_A_ (W)w);
2685
2686 EV_FREQUENT_CHECK;
2687 }
2688 #endif
2689
2690 #if EV_IDLE_ENABLE
2691 void
2692 ev_idle_start (EV_P_ ev_idle *w)
2693 {
2694 if (expect_false (ev_is_active (w)))
2695 return;
2696
2697 pri_adjust (EV_A_ (W)w);
2698
2699 EV_FREQUENT_CHECK;
2700
2701 {
2702 int active = ++idlecnt [ABSPRI (w)];
2703
2704 ++idleall;
2705 ev_start (EV_A_ (W)w, active);
2706
2707 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2708 idles [ABSPRI (w)][active - 1] = w;
2709 }
2710
2711 EV_FREQUENT_CHECK;
2712 }
2713
2714 void
2715 ev_idle_stop (EV_P_ ev_idle *w)
2716 {
2717 clear_pending (EV_A_ (W)w);
2718 if (expect_false (!ev_is_active (w)))
2719 return;
2720
2721 EV_FREQUENT_CHECK;
2722
2723 {
2724 int active = ev_active (w);
2725
2726 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2727 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2728
2729 ev_stop (EV_A_ (W)w);
2730 --idleall;
2731 }
2732
2733 EV_FREQUENT_CHECK;
2734 }
2735 #endif
2736
2737 void
2738 ev_prepare_start (EV_P_ ev_prepare *w)
2739 {
2740 if (expect_false (ev_is_active (w)))
2741 return;
2742
2743 EV_FREQUENT_CHECK;
2744
2745 ev_start (EV_A_ (W)w, ++preparecnt);
2746 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2747 prepares [preparecnt - 1] = w;
2748
2749 EV_FREQUENT_CHECK;
2750 }
2751
2752 void
2753 ev_prepare_stop (EV_P_ ev_prepare *w)
2754 {
2755 clear_pending (EV_A_ (W)w);
2756 if (expect_false (!ev_is_active (w)))
2757 return;
2758
2759 EV_FREQUENT_CHECK;
2760
2761 {
2762 int active = ev_active (w);
2763
2764 prepares [active - 1] = prepares [--preparecnt];
2765 ev_active (prepares [active - 1]) = active;
2766 }
2767
2768 ev_stop (EV_A_ (W)w);
2769
2770 EV_FREQUENT_CHECK;
2771 }
2772
2773 void
2774 ev_check_start (EV_P_ ev_check *w)
2775 {
2776 if (expect_false (ev_is_active (w)))
2777 return;
2778
2779 EV_FREQUENT_CHECK;
2780
2781 ev_start (EV_A_ (W)w, ++checkcnt);
2782 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2783 checks [checkcnt - 1] = w;
2784
2785 EV_FREQUENT_CHECK;
2786 }
2787
2788 void
2789 ev_check_stop (EV_P_ ev_check *w)
2790 {
2791 clear_pending (EV_A_ (W)w);
2792 if (expect_false (!ev_is_active (w)))
2793 return;
2794
2795 EV_FREQUENT_CHECK;
2796
2797 {
2798 int active = ev_active (w);
2799
2800 checks [active - 1] = checks [--checkcnt];
2801 ev_active (checks [active - 1]) = active;
2802 }
2803
2804 ev_stop (EV_A_ (W)w);
2805
2806 EV_FREQUENT_CHECK;
2807 }
2808
2809 #if EV_EMBED_ENABLE
2810 void noinline
2811 ev_embed_sweep (EV_P_ ev_embed *w)
2812 {
2813 ev_loop (w->other, EVLOOP_NONBLOCK);
2814 }
2815
2816 static void
2817 embed_io_cb (EV_P_ ev_io *io, int revents)
2818 {
2819 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2820
2821 if (ev_cb (w))
2822 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2823 else
2824 ev_loop (w->other, EVLOOP_NONBLOCK);
2825 }
2826
2827 static void
2828 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2829 {
2830 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2831
2832 {
2833 struct ev_loop *loop = w->other;
2834
2835 while (fdchangecnt)
2836 {
2837 fd_reify (EV_A);
2838 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2839 }
2840 }
2841 }
2842
2843 static void
2844 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
2845 {
2846 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
2847
2848 {
2849 struct ev_loop *loop = w->other;
2850
2851 ev_loop_fork (EV_A);
2852 }
2853 }
2854
2855 #if 0
2856 static void
2857 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2858 {
2859 ev_idle_stop (EV_A_ idle);
2860 }
2861 #endif
2862
2863 void
2864 ev_embed_start (EV_P_ ev_embed *w)
2865 {
2866 if (expect_false (ev_is_active (w)))
2867 return;
2868
2869 {
2870 struct ev_loop *loop = w->other;
2871 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2872 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2873 }
2874
2875 EV_FREQUENT_CHECK;
2876
2877 ev_set_priority (&w->io, ev_priority (w));
2878 ev_io_start (EV_A_ &w->io);
2879
2880 ev_prepare_init (&w->prepare, embed_prepare_cb);
2881 ev_set_priority (&w->prepare, EV_MINPRI);
2882 ev_prepare_start (EV_A_ &w->prepare);
2883
2884 ev_fork_init (&w->fork, embed_fork_cb);
2885 ev_fork_start (EV_A_ &w->fork);
2886
2887 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2888
2889 ev_start (EV_A_ (W)w, 1);
2890
2891 EV_FREQUENT_CHECK;
2892 }
2893
2894 void
2895 ev_embed_stop (EV_P_ ev_embed *w)
2896 {
2897 clear_pending (EV_A_ (W)w);
2898 if (expect_false (!ev_is_active (w)))
2899 return;
2900
2901 EV_FREQUENT_CHECK;
2902
2903 ev_io_stop (EV_A_ &w->io);
2904 ev_prepare_stop (EV_A_ &w->prepare);
2905 ev_fork_stop (EV_A_ &w->fork);
2906
2907 EV_FREQUENT_CHECK;
2908 }
2909 #endif
2910
2911 #if EV_FORK_ENABLE
2912 void
2913 ev_fork_start (EV_P_ ev_fork *w)
2914 {
2915 if (expect_false (ev_is_active (w)))
2916 return;
2917
2918 EV_FREQUENT_CHECK;
2919
2920 ev_start (EV_A_ (W)w, ++forkcnt);
2921 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2922 forks [forkcnt - 1] = w;
2923
2924 EV_FREQUENT_CHECK;
2925 }
2926
2927 void
2928 ev_fork_stop (EV_P_ ev_fork *w)
2929 {
2930 clear_pending (EV_A_ (W)w);
2931 if (expect_false (!ev_is_active (w)))
2932 return;
2933
2934 EV_FREQUENT_CHECK;
2935
2936 {
2937 int active = ev_active (w);
2938
2939 forks [active - 1] = forks [--forkcnt];
2940 ev_active (forks [active - 1]) = active;
2941 }
2942
2943 ev_stop (EV_A_ (W)w);
2944
2945 EV_FREQUENT_CHECK;
2946 }
2947 #endif
2948
2949 #if EV_ASYNC_ENABLE
2950 void
2951 ev_async_start (EV_P_ ev_async *w)
2952 {
2953 if (expect_false (ev_is_active (w)))
2954 return;
2955
2956 evpipe_init (EV_A);
2957
2958 EV_FREQUENT_CHECK;
2959
2960 ev_start (EV_A_ (W)w, ++asynccnt);
2961 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2962 asyncs [asynccnt - 1] = w;
2963
2964 EV_FREQUENT_CHECK;
2965 }
2966
2967 void
2968 ev_async_stop (EV_P_ ev_async *w)
2969 {
2970 clear_pending (EV_A_ (W)w);
2971 if (expect_false (!ev_is_active (w)))
2972 return;
2973
2974 EV_FREQUENT_CHECK;
2975
2976 {
2977 int active = ev_active (w);
2978
2979 asyncs [active - 1] = asyncs [--asynccnt];
2980 ev_active (asyncs [active - 1]) = active;
2981 }
2982
2983 ev_stop (EV_A_ (W)w);
2984
2985 EV_FREQUENT_CHECK;
2986 }
2987
2988 void
2989 ev_async_send (EV_P_ ev_async *w)
2990 {
2991 w->sent = 1;
2992 evpipe_write (EV_A_ &gotasync);
2993 }
2994 #endif
2995
2996 /*****************************************************************************/
2997
2998 struct ev_once
2999 {
3000 ev_io io;
3001 ev_timer to;
3002 void (*cb)(int revents, void *arg);
3003 void *arg;
3004 };
3005
3006 static void
3007 once_cb (EV_P_ struct ev_once *once, int revents)
3008 {
3009 void (*cb)(int revents, void *arg) = once->cb;
3010 void *arg = once->arg;
3011
3012 ev_io_stop (EV_A_ &once->io);
3013 ev_timer_stop (EV_A_ &once->to);
3014 ev_free (once);
3015
3016 cb (revents, arg);
3017 }
3018
3019 static void
3020 once_cb_io (EV_P_ ev_io *w, int revents)
3021 {
3022 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3023
3024 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3025 }
3026
3027 static void
3028 once_cb_to (EV_P_ ev_timer *w, int revents)
3029 {
3030 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3031
3032 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3033 }
3034
3035 void
3036 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3037 {
3038 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3039
3040 if (expect_false (!once))
3041 {
3042 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3043 return;
3044 }
3045
3046 once->cb = cb;
3047 once->arg = arg;
3048
3049 ev_init (&once->io, once_cb_io);
3050 if (fd >= 0)
3051 {
3052 ev_io_set (&once->io, fd, events);
3053 ev_io_start (EV_A_ &once->io);
3054 }
3055
3056 ev_init (&once->to, once_cb_to);
3057 if (timeout >= 0.)
3058 {
3059 ev_timer_set (&once->to, timeout, 0.);
3060 ev_timer_start (EV_A_ &once->to);
3061 }
3062 }
3063
3064 #if EV_MULTIPLICITY
3065 #include "ev_wrap.h"
3066 #endif
3067
3068 #ifdef __cplusplus
3069 }
3070 #endif
3071