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/cvs/libev/ev.c
Revision: 1.369
Committed: Sun Jan 23 18:53:06 2011 UTC (13 years, 6 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.368: +2 -0 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011 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 /* this big block deduces configuration from config.h */
41 #ifndef EV_STANDALONE
42 # ifdef EV_CONFIG_H
43 # include EV_CONFIG_H
44 # else
45 # include "config.h"
46 # endif
47
48 # if HAVE_CLOCK_SYSCALL
49 # ifndef EV_USE_CLOCK_SYSCALL
50 # define EV_USE_CLOCK_SYSCALL 1
51 # ifndef EV_USE_REALTIME
52 # define EV_USE_REALTIME 0
53 # endif
54 # ifndef EV_USE_MONOTONIC
55 # define EV_USE_MONOTONIC 1
56 # endif
57 # endif
58 # elif !defined(EV_USE_CLOCK_SYSCALL)
59 # define EV_USE_CLOCK_SYSCALL 0
60 # endif
61
62 # if HAVE_CLOCK_GETTIME
63 # ifndef EV_USE_MONOTONIC
64 # define EV_USE_MONOTONIC 1
65 # endif
66 # ifndef EV_USE_REALTIME
67 # define EV_USE_REALTIME 0
68 # endif
69 # else
70 # ifndef EV_USE_MONOTONIC
71 # define EV_USE_MONOTONIC 0
72 # endif
73 # ifndef EV_USE_REALTIME
74 # define EV_USE_REALTIME 0
75 # endif
76 # endif
77
78 # if HAVE_NANOSLEEP
79 # ifndef EV_USE_NANOSLEEP
80 # define EV_USE_NANOSLEEP EV_FEATURE_OS
81 # endif
82 # else
83 # undef EV_USE_NANOSLEEP
84 # define EV_USE_NANOSLEEP 0
85 # endif
86
87 # if HAVE_SELECT && HAVE_SYS_SELECT_H
88 # ifndef EV_USE_SELECT
89 # define EV_USE_SELECT EV_FEATURE_BACKENDS
90 # endif
91 # else
92 # undef EV_USE_SELECT
93 # define EV_USE_SELECT 0
94 # endif
95
96 # if HAVE_POLL && HAVE_POLL_H
97 # ifndef EV_USE_POLL
98 # define EV_USE_POLL EV_FEATURE_BACKENDS
99 # endif
100 # else
101 # undef EV_USE_POLL
102 # define EV_USE_POLL 0
103 # endif
104
105 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
106 # ifndef EV_USE_EPOLL
107 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
108 # endif
109 # else
110 # undef EV_USE_EPOLL
111 # define EV_USE_EPOLL 0
112 # endif
113
114 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
115 # ifndef EV_USE_KQUEUE
116 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
117 # endif
118 # else
119 # undef EV_USE_KQUEUE
120 # define EV_USE_KQUEUE 0
121 # endif
122
123 # if HAVE_PORT_H && HAVE_PORT_CREATE
124 # ifndef EV_USE_PORT
125 # define EV_USE_PORT EV_FEATURE_BACKENDS
126 # endif
127 # else
128 # undef EV_USE_PORT
129 # define EV_USE_PORT 0
130 # endif
131
132 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
133 # ifndef EV_USE_INOTIFY
134 # define EV_USE_INOTIFY EV_FEATURE_OS
135 # endif
136 # else
137 # undef EV_USE_INOTIFY
138 # define EV_USE_INOTIFY 0
139 # endif
140
141 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
142 # ifndef EV_USE_SIGNALFD
143 # define EV_USE_SIGNALFD EV_FEATURE_OS
144 # endif
145 # else
146 # undef EV_USE_SIGNALFD
147 # define EV_USE_SIGNALFD 0
148 # endif
149
150 # if HAVE_EVENTFD
151 # ifndef EV_USE_EVENTFD
152 # define EV_USE_EVENTFD EV_FEATURE_OS
153 # endif
154 # else
155 # undef EV_USE_EVENTFD
156 # define EV_USE_EVENTFD 0
157 # endif
158
159 #endif
160
161 #include <math.h>
162 #include <stdlib.h>
163 #include <string.h>
164 #include <fcntl.h>
165 #include <stddef.h>
166
167 #include <stdio.h>
168
169 #include <assert.h>
170 #include <errno.h>
171 #include <sys/types.h>
172 #include <time.h>
173 #include <limits.h>
174
175 #include <signal.h>
176
177 #ifdef EV_H
178 # include EV_H
179 #else
180 # include "ev.h"
181 #endif
182
183 EV_CPP(extern "C" {)
184
185 #ifndef _WIN32
186 # include <sys/time.h>
187 # include <sys/wait.h>
188 # include <unistd.h>
189 #else
190 # include <io.h>
191 # define WIN32_LEAN_AND_MEAN
192 # include <windows.h>
193 # ifndef EV_SELECT_IS_WINSOCKET
194 # define EV_SELECT_IS_WINSOCKET 1
195 # endif
196 # undef EV_AVOID_STDIO
197 #endif
198
199 /* OS X, in its infinite idiocy, actually HARDCODES
200 * a limit of 1024 into their select. Where people have brains,
201 * OS X engineers apparently have a vacuum. Or maybe they were
202 * ordered to have a vacuum, or they do anything for money.
203 * This might help. Or not.
204 */
205 #define _DARWIN_UNLIMITED_SELECT 1
206
207 /* this block tries to deduce configuration from header-defined symbols and defaults */
208
209 /* try to deduce the maximum number of signals on this platform */
210 #if defined (EV_NSIG)
211 /* use what's provided */
212 #elif defined (NSIG)
213 # define EV_NSIG (NSIG)
214 #elif defined(_NSIG)
215 # define EV_NSIG (_NSIG)
216 #elif defined (SIGMAX)
217 # define EV_NSIG (SIGMAX+1)
218 #elif defined (SIG_MAX)
219 # define EV_NSIG (SIG_MAX+1)
220 #elif defined (_SIG_MAX)
221 # define EV_NSIG (_SIG_MAX+1)
222 #elif defined (MAXSIG)
223 # define EV_NSIG (MAXSIG+1)
224 #elif defined (MAX_SIG)
225 # define EV_NSIG (MAX_SIG+1)
226 #elif defined (SIGARRAYSIZE)
227 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
228 #elif defined (_sys_nsig)
229 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
230 #else
231 # error "unable to find value for NSIG, please report"
232 /* to make it compile regardless, just remove the above line, */
233 /* but consider reporting it, too! :) */
234 # define EV_NSIG 65
235 #endif
236
237 #ifndef EV_USE_CLOCK_SYSCALL
238 # if __linux && __GLIBC__ >= 2
239 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
240 # else
241 # define EV_USE_CLOCK_SYSCALL 0
242 # endif
243 #endif
244
245 #ifndef EV_USE_MONOTONIC
246 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
247 # define EV_USE_MONOTONIC EV_FEATURE_OS
248 # else
249 # define EV_USE_MONOTONIC 0
250 # endif
251 #endif
252
253 #ifndef EV_USE_REALTIME
254 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
255 #endif
256
257 #ifndef EV_USE_NANOSLEEP
258 # if _POSIX_C_SOURCE >= 199309L
259 # define EV_USE_NANOSLEEP EV_FEATURE_OS
260 # else
261 # define EV_USE_NANOSLEEP 0
262 # endif
263 #endif
264
265 #ifndef EV_USE_SELECT
266 # define EV_USE_SELECT EV_FEATURE_BACKENDS
267 #endif
268
269 #ifndef EV_USE_POLL
270 # ifdef _WIN32
271 # define EV_USE_POLL 0
272 # else
273 # define EV_USE_POLL EV_FEATURE_BACKENDS
274 # endif
275 #endif
276
277 #ifndef EV_USE_EPOLL
278 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
279 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
280 # else
281 # define EV_USE_EPOLL 0
282 # endif
283 #endif
284
285 #ifndef EV_USE_KQUEUE
286 # define EV_USE_KQUEUE 0
287 #endif
288
289 #ifndef EV_USE_PORT
290 # define EV_USE_PORT 0
291 #endif
292
293 #ifndef EV_USE_INOTIFY
294 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
295 # define EV_USE_INOTIFY EV_FEATURE_OS
296 # else
297 # define EV_USE_INOTIFY 0
298 # endif
299 #endif
300
301 #ifndef EV_PID_HASHSIZE
302 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
303 #endif
304
305 #ifndef EV_INOTIFY_HASHSIZE
306 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
307 #endif
308
309 #ifndef EV_USE_EVENTFD
310 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
311 # define EV_USE_EVENTFD EV_FEATURE_OS
312 # else
313 # define EV_USE_EVENTFD 0
314 # endif
315 #endif
316
317 #ifndef EV_USE_SIGNALFD
318 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
319 # define EV_USE_SIGNALFD EV_FEATURE_OS
320 # else
321 # define EV_USE_SIGNALFD 0
322 # endif
323 #endif
324
325 #if 0 /* debugging */
326 # define EV_VERIFY 3
327 # define EV_USE_4HEAP 1
328 # define EV_HEAP_CACHE_AT 1
329 #endif
330
331 #ifndef EV_VERIFY
332 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
333 #endif
334
335 #ifndef EV_USE_4HEAP
336 # define EV_USE_4HEAP EV_FEATURE_DATA
337 #endif
338
339 #ifndef EV_HEAP_CACHE_AT
340 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
341 #endif
342
343 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
344 /* which makes programs even slower. might work on other unices, too. */
345 #if EV_USE_CLOCK_SYSCALL
346 # include <syscall.h>
347 # ifdef SYS_clock_gettime
348 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
349 # undef EV_USE_MONOTONIC
350 # define EV_USE_MONOTONIC 1
351 # else
352 # undef EV_USE_CLOCK_SYSCALL
353 # define EV_USE_CLOCK_SYSCALL 0
354 # endif
355 #endif
356
357 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
358
359 #ifdef _AIX
360 /* AIX has a completely broken poll.h header */
361 # undef EV_USE_POLL
362 # define EV_USE_POLL 0
363 #endif
364
365 #ifndef CLOCK_MONOTONIC
366 # undef EV_USE_MONOTONIC
367 # define EV_USE_MONOTONIC 0
368 #endif
369
370 #ifndef CLOCK_REALTIME
371 # undef EV_USE_REALTIME
372 # define EV_USE_REALTIME 0
373 #endif
374
375 #if !EV_STAT_ENABLE
376 # undef EV_USE_INOTIFY
377 # define EV_USE_INOTIFY 0
378 #endif
379
380 #if !EV_USE_NANOSLEEP
381 # ifndef _WIN32
382 # include <sys/select.h>
383 # endif
384 #endif
385
386 #if EV_USE_INOTIFY
387 # include <sys/statfs.h>
388 # include <sys/inotify.h>
389 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
390 # ifndef IN_DONT_FOLLOW
391 # undef EV_USE_INOTIFY
392 # define EV_USE_INOTIFY 0
393 # endif
394 #endif
395
396 #if EV_SELECT_IS_WINSOCKET
397 # include <winsock.h>
398 #endif
399
400 #if EV_USE_EVENTFD
401 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
402 # include <stdint.h>
403 # ifndef EFD_NONBLOCK
404 # define EFD_NONBLOCK O_NONBLOCK
405 # endif
406 # ifndef EFD_CLOEXEC
407 # ifdef O_CLOEXEC
408 # define EFD_CLOEXEC O_CLOEXEC
409 # else
410 # define EFD_CLOEXEC 02000000
411 # endif
412 # endif
413 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
414 #endif
415
416 #if EV_USE_SIGNALFD
417 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
418 # include <stdint.h>
419 # ifndef SFD_NONBLOCK
420 # define SFD_NONBLOCK O_NONBLOCK
421 # endif
422 # ifndef SFD_CLOEXEC
423 # ifdef O_CLOEXEC
424 # define SFD_CLOEXEC O_CLOEXEC
425 # else
426 # define SFD_CLOEXEC 02000000
427 # endif
428 # endif
429 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
430
431 struct signalfd_siginfo
432 {
433 uint32_t ssi_signo;
434 char pad[128 - sizeof (uint32_t)];
435 };
436 #endif
437
438 /**/
439
440 #if EV_VERIFY >= 3
441 # define EV_FREQUENT_CHECK ev_verify (EV_A)
442 #else
443 # define EV_FREQUENT_CHECK do { } while (0)
444 #endif
445
446 /*
447 * This is used to avoid floating point rounding problems.
448 * It is added to ev_rt_now when scheduling periodics
449 * to ensure progress, time-wise, even when rounding
450 * errors are against us.
451 * This value is good at least till the year 4000.
452 * Better solutions welcome.
453 */
454 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
455
456 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
457 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
458
459 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
460 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
461
462 #if __GNUC__ >= 4
463 # define expect(expr,value) __builtin_expect ((expr),(value))
464 # define noinline __attribute__ ((noinline))
465 #else
466 # define expect(expr,value) (expr)
467 # define noinline
468 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
469 # define inline
470 # endif
471 #endif
472
473 #define expect_false(expr) expect ((expr) != 0, 0)
474 #define expect_true(expr) expect ((expr) != 0, 1)
475 #define inline_size static inline
476
477 #if EV_FEATURE_CODE
478 # define inline_speed static inline
479 #else
480 # define inline_speed static noinline
481 #endif
482
483 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
484
485 #if EV_MINPRI == EV_MAXPRI
486 # define ABSPRI(w) (((W)w), 0)
487 #else
488 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
489 #endif
490
491 #define EMPTY /* required for microsofts broken pseudo-c compiler */
492 #define EMPTY2(a,b) /* used to suppress some warnings */
493
494 typedef ev_watcher *W;
495 typedef ev_watcher_list *WL;
496 typedef ev_watcher_time *WT;
497
498 #define ev_active(w) ((W)(w))->active
499 #define ev_at(w) ((WT)(w))->at
500
501 #if EV_USE_REALTIME
502 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
503 /* giving it a reasonably high chance of working on typical architectures */
504 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
505 #endif
506
507 #if EV_USE_MONOTONIC
508 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
509 #endif
510
511 #ifndef EV_FD_TO_WIN32_HANDLE
512 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
513 #endif
514 #ifndef EV_WIN32_HANDLE_TO_FD
515 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
516 #endif
517 #ifndef EV_WIN32_CLOSE_FD
518 # define EV_WIN32_CLOSE_FD(fd) close (fd)
519 #endif
520
521 #ifdef _WIN32
522 # include "ev_win32.c"
523 #endif
524
525 /*****************************************************************************/
526
527 #ifdef __linux
528 # include <sys/utsname.h>
529 #endif
530
531 static unsigned int noinline
532 ev_linux_version (void)
533 {
534 #ifdef __linux
535 unsigned int v = 0;
536 struct utsname buf;
537 int i;
538 char *p = buf.release;
539
540 if (uname (&buf))
541 return 0;
542
543 for (i = 3+1; --i; )
544 {
545 unsigned int c = 0;
546
547 for (;;)
548 {
549 if (*p >= '0' && *p <= '9')
550 c = c * 10 + *p++ - '0';
551 else
552 {
553 p += *p == '.';
554 break;
555 }
556 }
557
558 v = (v << 8) | c;
559 }
560
561 return v;
562 #else
563 return 0;
564 #endif
565 }
566
567 /*****************************************************************************/
568
569 #if EV_AVOID_STDIO
570 static void noinline
571 ev_printerr (const char *msg)
572 {
573 write (STDERR_FILENO, msg, strlen (msg));
574 }
575 #endif
576
577 static void (*syserr_cb)(const char *msg);
578
579 void
580 ev_set_syserr_cb (void (*cb)(const char *msg))
581 {
582 syserr_cb = cb;
583 }
584
585 static void noinline
586 ev_syserr (const char *msg)
587 {
588 if (!msg)
589 msg = "(libev) system error";
590
591 if (syserr_cb)
592 syserr_cb (msg);
593 else
594 {
595 #if EV_AVOID_STDIO
596 ev_printerr (msg);
597 ev_printerr (": ");
598 ev_printerr (strerror (errno));
599 ev_printerr ("\n");
600 #else
601 perror (msg);
602 #endif
603 abort ();
604 }
605 }
606
607 static void *
608 ev_realloc_emul (void *ptr, long size)
609 {
610 #if __GLIBC__
611 return realloc (ptr, size);
612 #else
613 /* some systems, notably openbsd and darwin, fail to properly
614 * implement realloc (x, 0) (as required by both ansi c-89 and
615 * the single unix specification, so work around them here.
616 */
617
618 if (size)
619 return realloc (ptr, size);
620
621 free (ptr);
622 return 0;
623 #endif
624 }
625
626 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
627
628 void
629 ev_set_allocator (void *(*cb)(void *ptr, long size))
630 {
631 alloc = cb;
632 }
633
634 inline_speed void *
635 ev_realloc (void *ptr, long size)
636 {
637 ptr = alloc (ptr, size);
638
639 if (!ptr && size)
640 {
641 #if EV_AVOID_STDIO
642 ev_printerr ("(libev) memory allocation failed, aborting.\n");
643 #else
644 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
645 #endif
646 abort ();
647 }
648
649 return ptr;
650 }
651
652 #define ev_malloc(size) ev_realloc (0, (size))
653 #define ev_free(ptr) ev_realloc ((ptr), 0)
654
655 /*****************************************************************************/
656
657 /* set in reify when reification needed */
658 #define EV_ANFD_REIFY 1
659
660 /* file descriptor info structure */
661 typedef struct
662 {
663 WL head;
664 unsigned char events; /* the events watched for */
665 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
666 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
667 unsigned char unused;
668 #if EV_USE_EPOLL
669 unsigned int egen; /* generation counter to counter epoll bugs */
670 #endif
671 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
672 SOCKET handle;
673 #endif
674 #if EV_USE_IOCP
675 OVERLAPPED or, ow;
676 #endif
677 } ANFD;
678
679 /* stores the pending event set for a given watcher */
680 typedef struct
681 {
682 W w;
683 int events; /* the pending event set for the given watcher */
684 } ANPENDING;
685
686 #if EV_USE_INOTIFY
687 /* hash table entry per inotify-id */
688 typedef struct
689 {
690 WL head;
691 } ANFS;
692 #endif
693
694 /* Heap Entry */
695 #if EV_HEAP_CACHE_AT
696 /* a heap element */
697 typedef struct {
698 ev_tstamp at;
699 WT w;
700 } ANHE;
701
702 #define ANHE_w(he) (he).w /* access watcher, read-write */
703 #define ANHE_at(he) (he).at /* access cached at, read-only */
704 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
705 #else
706 /* a heap element */
707 typedef WT ANHE;
708
709 #define ANHE_w(he) (he)
710 #define ANHE_at(he) (he)->at
711 #define ANHE_at_cache(he)
712 #endif
713
714 #if EV_MULTIPLICITY
715
716 struct ev_loop
717 {
718 ev_tstamp ev_rt_now;
719 #define ev_rt_now ((loop)->ev_rt_now)
720 #define VAR(name,decl) decl;
721 #include "ev_vars.h"
722 #undef VAR
723 };
724 #include "ev_wrap.h"
725
726 static struct ev_loop default_loop_struct;
727 struct ev_loop *ev_default_loop_ptr;
728
729 #else
730
731 ev_tstamp ev_rt_now;
732 #define VAR(name,decl) static decl;
733 #include "ev_vars.h"
734 #undef VAR
735
736 static int ev_default_loop_ptr;
737
738 #endif
739
740 #if EV_FEATURE_API
741 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
742 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
743 # define EV_INVOKE_PENDING invoke_cb (EV_A)
744 #else
745 # define EV_RELEASE_CB (void)0
746 # define EV_ACQUIRE_CB (void)0
747 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
748 #endif
749
750 #define EVBREAK_RECURSE 0x80
751
752 /*****************************************************************************/
753
754 #ifndef EV_HAVE_EV_TIME
755 ev_tstamp
756 ev_time (void)
757 {
758 #if EV_USE_REALTIME
759 if (expect_true (have_realtime))
760 {
761 struct timespec ts;
762 clock_gettime (CLOCK_REALTIME, &ts);
763 return ts.tv_sec + ts.tv_nsec * 1e-9;
764 }
765 #endif
766
767 struct timeval tv;
768 gettimeofday (&tv, 0);
769 return tv.tv_sec + tv.tv_usec * 1e-6;
770 }
771 #endif
772
773 inline_size ev_tstamp
774 get_clock (void)
775 {
776 #if EV_USE_MONOTONIC
777 if (expect_true (have_monotonic))
778 {
779 struct timespec ts;
780 clock_gettime (CLOCK_MONOTONIC, &ts);
781 return ts.tv_sec + ts.tv_nsec * 1e-9;
782 }
783 #endif
784
785 return ev_time ();
786 }
787
788 #if EV_MULTIPLICITY
789 ev_tstamp
790 ev_now (EV_P)
791 {
792 return ev_rt_now;
793 }
794 #endif
795
796 void
797 ev_sleep (ev_tstamp delay)
798 {
799 if (delay > 0.)
800 {
801 #if EV_USE_NANOSLEEP
802 struct timespec ts;
803
804 EV_TS_SET (ts, delay);
805 nanosleep (&ts, 0);
806 #elif defined(_WIN32)
807 Sleep ((unsigned long)(delay * 1e3));
808 #else
809 struct timeval tv;
810
811 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
812 /* something not guaranteed by newer posix versions, but guaranteed */
813 /* by older ones */
814 EV_TV_SET (tv, delay);
815 select (0, 0, 0, 0, &tv);
816 #endif
817 }
818 }
819
820 inline_speed int
821 ev_timeout_to_ms (ev_tstamp timeout)
822 {
823 int ms = timeout * 1000. + .999999;
824
825 return expect_true (ms) ? ms : timeout < 1e-6 ? 0 : 1;
826 }
827
828 /*****************************************************************************/
829
830 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
831
832 /* find a suitable new size for the given array, */
833 /* hopefully by rounding to a nice-to-malloc size */
834 inline_size int
835 array_nextsize (int elem, int cur, int cnt)
836 {
837 int ncur = cur + 1;
838
839 do
840 ncur <<= 1;
841 while (cnt > ncur);
842
843 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
844 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
845 {
846 ncur *= elem;
847 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
848 ncur = ncur - sizeof (void *) * 4;
849 ncur /= elem;
850 }
851
852 return ncur;
853 }
854
855 static noinline void *
856 array_realloc (int elem, void *base, int *cur, int cnt)
857 {
858 *cur = array_nextsize (elem, *cur, cnt);
859 return ev_realloc (base, elem * *cur);
860 }
861
862 #define array_init_zero(base,count) \
863 memset ((void *)(base), 0, sizeof (*(base)) * (count))
864
865 #define array_needsize(type,base,cur,cnt,init) \
866 if (expect_false ((cnt) > (cur))) \
867 { \
868 int ocur_ = (cur); \
869 (base) = (type *)array_realloc \
870 (sizeof (type), (base), &(cur), (cnt)); \
871 init ((base) + (ocur_), (cur) - ocur_); \
872 }
873
874 #if 0
875 #define array_slim(type,stem) \
876 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
877 { \
878 stem ## max = array_roundsize (stem ## cnt >> 1); \
879 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
880 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
881 }
882 #endif
883
884 #define array_free(stem, idx) \
885 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
886
887 /*****************************************************************************/
888
889 /* dummy callback for pending events */
890 static void noinline
891 pendingcb (EV_P_ ev_prepare *w, int revents)
892 {
893 }
894
895 void noinline
896 ev_feed_event (EV_P_ void *w, int revents)
897 {
898 W w_ = (W)w;
899 int pri = ABSPRI (w_);
900
901 if (expect_false (w_->pending))
902 pendings [pri][w_->pending - 1].events |= revents;
903 else
904 {
905 w_->pending = ++pendingcnt [pri];
906 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
907 pendings [pri][w_->pending - 1].w = w_;
908 pendings [pri][w_->pending - 1].events = revents;
909 }
910 }
911
912 inline_speed void
913 feed_reverse (EV_P_ W w)
914 {
915 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
916 rfeeds [rfeedcnt++] = w;
917 }
918
919 inline_size void
920 feed_reverse_done (EV_P_ int revents)
921 {
922 do
923 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
924 while (rfeedcnt);
925 }
926
927 inline_speed void
928 queue_events (EV_P_ W *events, int eventcnt, int type)
929 {
930 int i;
931
932 for (i = 0; i < eventcnt; ++i)
933 ev_feed_event (EV_A_ events [i], type);
934 }
935
936 /*****************************************************************************/
937
938 inline_speed void
939 fd_event_nocheck (EV_P_ int fd, int revents)
940 {
941 ANFD *anfd = anfds + fd;
942 ev_io *w;
943
944 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
945 {
946 int ev = w->events & revents;
947
948 if (ev)
949 ev_feed_event (EV_A_ (W)w, ev);
950 }
951 }
952
953 /* do not submit kernel events for fds that have reify set */
954 /* because that means they changed while we were polling for new events */
955 inline_speed void
956 fd_event (EV_P_ int fd, int revents)
957 {
958 ANFD *anfd = anfds + fd;
959
960 if (expect_true (!anfd->reify))
961 fd_event_nocheck (EV_A_ fd, revents);
962 }
963
964 void
965 ev_feed_fd_event (EV_P_ int fd, int revents)
966 {
967 if (fd >= 0 && fd < anfdmax)
968 fd_event_nocheck (EV_A_ fd, revents);
969 }
970
971 /* make sure the external fd watch events are in-sync */
972 /* with the kernel/libev internal state */
973 inline_size void
974 fd_reify (EV_P)
975 {
976 int i;
977
978 for (i = 0; i < fdchangecnt; ++i)
979 {
980 int fd = fdchanges [i];
981 ANFD *anfd = anfds + fd;
982 ev_io *w;
983
984 unsigned char o_events = anfd->events;
985 unsigned char o_reify = anfd->reify;
986
987 anfd->reify = 0;
988
989 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
990 if (o_reify & EV__IOFDSET)
991 {
992 unsigned long arg;
993 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
994 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
995 printf ("oi %d %x\n", fd, anfd->handle);//D
996 }
997 #endif
998
999 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1000 {
1001 anfd->events = 0;
1002
1003 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1004 anfd->events |= (unsigned char)w->events;
1005
1006 if (o_events != anfd->events)
1007 o_reify = EV__IOFDSET; /* actually |= */
1008 }
1009
1010 if (o_reify & EV__IOFDSET)
1011 backend_modify (EV_A_ fd, o_events, anfd->events);
1012 }
1013
1014 fdchangecnt = 0;
1015 }
1016
1017 /* something about the given fd changed */
1018 inline_size void
1019 fd_change (EV_P_ int fd, int flags)
1020 {
1021 unsigned char reify = anfds [fd].reify;
1022 anfds [fd].reify |= flags;
1023
1024 if (expect_true (!reify))
1025 {
1026 ++fdchangecnt;
1027 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1028 fdchanges [fdchangecnt - 1] = fd;
1029 }
1030 }
1031
1032 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1033 inline_speed void
1034 fd_kill (EV_P_ int fd)
1035 {
1036 ev_io *w;
1037
1038 while ((w = (ev_io *)anfds [fd].head))
1039 {
1040 ev_io_stop (EV_A_ w);
1041 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1042 }
1043 }
1044
1045 /* check whether the given fd is actually valid, for error recovery */
1046 inline_size int
1047 fd_valid (int fd)
1048 {
1049 #ifdef _WIN32
1050 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1051 #else
1052 return fcntl (fd, F_GETFD) != -1;
1053 #endif
1054 }
1055
1056 /* called on EBADF to verify fds */
1057 static void noinline
1058 fd_ebadf (EV_P)
1059 {
1060 int fd;
1061
1062 for (fd = 0; fd < anfdmax; ++fd)
1063 if (anfds [fd].events)
1064 if (!fd_valid (fd) && errno == EBADF)
1065 fd_kill (EV_A_ fd);
1066 }
1067
1068 /* called on ENOMEM in select/poll to kill some fds and retry */
1069 static void noinline
1070 fd_enomem (EV_P)
1071 {
1072 int fd;
1073
1074 for (fd = anfdmax; fd--; )
1075 if (anfds [fd].events)
1076 {
1077 fd_kill (EV_A_ fd);
1078 break;
1079 }
1080 }
1081
1082 /* usually called after fork if backend needs to re-arm all fds from scratch */
1083 static void noinline
1084 fd_rearm_all (EV_P)
1085 {
1086 int fd;
1087
1088 for (fd = 0; fd < anfdmax; ++fd)
1089 if (anfds [fd].events)
1090 {
1091 anfds [fd].events = 0;
1092 anfds [fd].emask = 0;
1093 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1094 }
1095 }
1096
1097 /* used to prepare libev internal fd's */
1098 /* this is not fork-safe */
1099 inline_speed void
1100 fd_intern (int fd)
1101 {
1102 #ifdef _WIN32
1103 unsigned long arg = 1;
1104 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1105 #else
1106 fcntl (fd, F_SETFD, FD_CLOEXEC);
1107 fcntl (fd, F_SETFL, O_NONBLOCK);
1108 #endif
1109 }
1110
1111 /*****************************************************************************/
1112
1113 /*
1114 * the heap functions want a real array index. array index 0 is guaranteed to not
1115 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1116 * the branching factor of the d-tree.
1117 */
1118
1119 /*
1120 * at the moment we allow libev the luxury of two heaps,
1121 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1122 * which is more cache-efficient.
1123 * the difference is about 5% with 50000+ watchers.
1124 */
1125 #if EV_USE_4HEAP
1126
1127 #define DHEAP 4
1128 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1129 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1130 #define UPHEAP_DONE(p,k) ((p) == (k))
1131
1132 /* away from the root */
1133 inline_speed void
1134 downheap (ANHE *heap, int N, int k)
1135 {
1136 ANHE he = heap [k];
1137 ANHE *E = heap + N + HEAP0;
1138
1139 for (;;)
1140 {
1141 ev_tstamp minat;
1142 ANHE *minpos;
1143 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1144
1145 /* find minimum child */
1146 if (expect_true (pos + DHEAP - 1 < E))
1147 {
1148 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1149 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1150 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1151 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1152 }
1153 else if (pos < E)
1154 {
1155 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1156 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1157 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1158 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1159 }
1160 else
1161 break;
1162
1163 if (ANHE_at (he) <= minat)
1164 break;
1165
1166 heap [k] = *minpos;
1167 ev_active (ANHE_w (*minpos)) = k;
1168
1169 k = minpos - heap;
1170 }
1171
1172 heap [k] = he;
1173 ev_active (ANHE_w (he)) = k;
1174 }
1175
1176 #else /* 4HEAP */
1177
1178 #define HEAP0 1
1179 #define HPARENT(k) ((k) >> 1)
1180 #define UPHEAP_DONE(p,k) (!(p))
1181
1182 /* away from the root */
1183 inline_speed void
1184 downheap (ANHE *heap, int N, int k)
1185 {
1186 ANHE he = heap [k];
1187
1188 for (;;)
1189 {
1190 int c = k << 1;
1191
1192 if (c >= N + HEAP0)
1193 break;
1194
1195 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1196 ? 1 : 0;
1197
1198 if (ANHE_at (he) <= ANHE_at (heap [c]))
1199 break;
1200
1201 heap [k] = heap [c];
1202 ev_active (ANHE_w (heap [k])) = k;
1203
1204 k = c;
1205 }
1206
1207 heap [k] = he;
1208 ev_active (ANHE_w (he)) = k;
1209 }
1210 #endif
1211
1212 /* towards the root */
1213 inline_speed void
1214 upheap (ANHE *heap, int k)
1215 {
1216 ANHE he = heap [k];
1217
1218 for (;;)
1219 {
1220 int p = HPARENT (k);
1221
1222 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1223 break;
1224
1225 heap [k] = heap [p];
1226 ev_active (ANHE_w (heap [k])) = k;
1227 k = p;
1228 }
1229
1230 heap [k] = he;
1231 ev_active (ANHE_w (he)) = k;
1232 }
1233
1234 /* move an element suitably so it is in a correct place */
1235 inline_size void
1236 adjustheap (ANHE *heap, int N, int k)
1237 {
1238 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1239 upheap (heap, k);
1240 else
1241 downheap (heap, N, k);
1242 }
1243
1244 /* rebuild the heap: this function is used only once and executed rarely */
1245 inline_size void
1246 reheap (ANHE *heap, int N)
1247 {
1248 int i;
1249
1250 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1251 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1252 for (i = 0; i < N; ++i)
1253 upheap (heap, i + HEAP0);
1254 }
1255
1256 /*****************************************************************************/
1257
1258 /* associate signal watchers to a signal signal */
1259 typedef struct
1260 {
1261 EV_ATOMIC_T pending;
1262 #if EV_MULTIPLICITY
1263 EV_P;
1264 #endif
1265 WL head;
1266 } ANSIG;
1267
1268 static ANSIG signals [EV_NSIG - 1];
1269
1270 /*****************************************************************************/
1271
1272 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1273
1274 static void noinline
1275 evpipe_init (EV_P)
1276 {
1277 if (!ev_is_active (&pipe_w))
1278 {
1279 # if EV_USE_EVENTFD
1280 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1281 if (evfd < 0 && errno == EINVAL)
1282 evfd = eventfd (0, 0);
1283
1284 if (evfd >= 0)
1285 {
1286 evpipe [0] = -1;
1287 fd_intern (evfd); /* doing it twice doesn't hurt */
1288 ev_io_set (&pipe_w, evfd, EV_READ);
1289 }
1290 else
1291 # endif
1292 {
1293 while (pipe (evpipe))
1294 ev_syserr ("(libev) error creating signal/async pipe");
1295
1296 fd_intern (evpipe [0]);
1297 fd_intern (evpipe [1]);
1298 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1299 }
1300
1301 ev_io_start (EV_A_ &pipe_w);
1302 ev_unref (EV_A); /* watcher should not keep loop alive */
1303 }
1304 }
1305
1306 inline_size void
1307 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1308 {
1309 if (!*flag)
1310 {
1311 int old_errno = errno; /* save errno because write might clobber it */
1312 char dummy;
1313
1314 *flag = 1;
1315
1316 #if EV_USE_EVENTFD
1317 if (evfd >= 0)
1318 {
1319 uint64_t counter = 1;
1320 write (evfd, &counter, sizeof (uint64_t));
1321 }
1322 else
1323 #endif
1324 /* win32 people keep sending patches that change this write() to send() */
1325 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1326 /* so when you think this write should be a send instead, please find out */
1327 /* where your send() is from - it's definitely not the microsoft send, and */
1328 /* tell me. thank you. */
1329 write (evpipe [1], &dummy, 1);
1330
1331 errno = old_errno;
1332 }
1333 }
1334
1335 /* called whenever the libev signal pipe */
1336 /* got some events (signal, async) */
1337 static void
1338 pipecb (EV_P_ ev_io *iow, int revents)
1339 {
1340 int i;
1341
1342 #if EV_USE_EVENTFD
1343 if (evfd >= 0)
1344 {
1345 uint64_t counter;
1346 read (evfd, &counter, sizeof (uint64_t));
1347 }
1348 else
1349 #endif
1350 {
1351 char dummy;
1352 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1353 read (evpipe [0], &dummy, 1);
1354 }
1355
1356 #if EV_SIGNAL_ENABLE
1357 if (sig_pending)
1358 {
1359 sig_pending = 0;
1360
1361 for (i = EV_NSIG - 1; i--; )
1362 if (expect_false (signals [i].pending))
1363 ev_feed_signal_event (EV_A_ i + 1);
1364 }
1365 #endif
1366
1367 #if EV_ASYNC_ENABLE
1368 if (async_pending)
1369 {
1370 async_pending = 0;
1371
1372 for (i = asynccnt; i--; )
1373 if (asyncs [i]->sent)
1374 {
1375 asyncs [i]->sent = 0;
1376 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1377 }
1378 }
1379 #endif
1380 }
1381
1382 /*****************************************************************************/
1383
1384 void
1385 ev_feed_signal (int signum)
1386 {
1387 #if EV_MULTIPLICITY
1388 EV_P = signals [signum - 1].loop;
1389
1390 if (!EV_A)
1391 return;
1392 #endif
1393
1394 signals [signum - 1].pending = 1;
1395 evpipe_write (EV_A_ &sig_pending);
1396 }
1397
1398 static void
1399 ev_sighandler (int signum)
1400 {
1401 #ifdef _WIN32
1402 signal (signum, ev_sighandler);
1403 #endif
1404
1405 ev_feed_signal (signum);
1406 }
1407
1408 void noinline
1409 ev_feed_signal_event (EV_P_ int signum)
1410 {
1411 WL w;
1412
1413 if (expect_false (signum <= 0 || signum > EV_NSIG))
1414 return;
1415
1416 --signum;
1417
1418 #if EV_MULTIPLICITY
1419 /* it is permissible to try to feed a signal to the wrong loop */
1420 /* or, likely more useful, feeding a signal nobody is waiting for */
1421
1422 if (expect_false (signals [signum].loop != EV_A))
1423 return;
1424 #endif
1425
1426 signals [signum].pending = 0;
1427
1428 for (w = signals [signum].head; w; w = w->next)
1429 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1430 }
1431
1432 #if EV_USE_SIGNALFD
1433 static void
1434 sigfdcb (EV_P_ ev_io *iow, int revents)
1435 {
1436 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1437
1438 for (;;)
1439 {
1440 ssize_t res = read (sigfd, si, sizeof (si));
1441
1442 /* not ISO-C, as res might be -1, but works with SuS */
1443 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1444 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1445
1446 if (res < (ssize_t)sizeof (si))
1447 break;
1448 }
1449 }
1450 #endif
1451
1452 #endif
1453
1454 /*****************************************************************************/
1455
1456 #if EV_CHILD_ENABLE
1457 static WL childs [EV_PID_HASHSIZE];
1458
1459 static ev_signal childev;
1460
1461 #ifndef WIFCONTINUED
1462 # define WIFCONTINUED(status) 0
1463 #endif
1464
1465 /* handle a single child status event */
1466 inline_speed void
1467 child_reap (EV_P_ int chain, int pid, int status)
1468 {
1469 ev_child *w;
1470 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1471
1472 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1473 {
1474 if ((w->pid == pid || !w->pid)
1475 && (!traced || (w->flags & 1)))
1476 {
1477 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1478 w->rpid = pid;
1479 w->rstatus = status;
1480 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1481 }
1482 }
1483 }
1484
1485 #ifndef WCONTINUED
1486 # define WCONTINUED 0
1487 #endif
1488
1489 /* called on sigchld etc., calls waitpid */
1490 static void
1491 childcb (EV_P_ ev_signal *sw, int revents)
1492 {
1493 int pid, status;
1494
1495 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1496 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1497 if (!WCONTINUED
1498 || errno != EINVAL
1499 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1500 return;
1501
1502 /* make sure we are called again until all children have been reaped */
1503 /* we need to do it this way so that the callback gets called before we continue */
1504 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1505
1506 child_reap (EV_A_ pid, pid, status);
1507 if ((EV_PID_HASHSIZE) > 1)
1508 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1509 }
1510
1511 #endif
1512
1513 /*****************************************************************************/
1514
1515 #if EV_USE_IOCP
1516 # include "ev_iocp.c"
1517 #endif
1518 #if EV_USE_PORT
1519 # include "ev_port.c"
1520 #endif
1521 #if EV_USE_KQUEUE
1522 # include "ev_kqueue.c"
1523 #endif
1524 #if EV_USE_EPOLL
1525 # include "ev_epoll.c"
1526 #endif
1527 #if EV_USE_POLL
1528 # include "ev_poll.c"
1529 #endif
1530 #if EV_USE_SELECT
1531 # include "ev_select.c"
1532 #endif
1533
1534 int
1535 ev_version_major (void)
1536 {
1537 return EV_VERSION_MAJOR;
1538 }
1539
1540 int
1541 ev_version_minor (void)
1542 {
1543 return EV_VERSION_MINOR;
1544 }
1545
1546 /* return true if we are running with elevated privileges and should ignore env variables */
1547 int inline_size
1548 enable_secure (void)
1549 {
1550 #ifdef _WIN32
1551 return 0;
1552 #else
1553 return getuid () != geteuid ()
1554 || getgid () != getegid ();
1555 #endif
1556 }
1557
1558 unsigned int
1559 ev_supported_backends (void)
1560 {
1561 unsigned int flags = 0;
1562
1563 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1564 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1565 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1566 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1567 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1568
1569 return flags;
1570 }
1571
1572 unsigned int
1573 ev_recommended_backends (void)
1574 {
1575 unsigned int flags = ev_supported_backends ();
1576
1577 #ifndef __NetBSD__
1578 /* kqueue is borked on everything but netbsd apparently */
1579 /* it usually doesn't work correctly on anything but sockets and pipes */
1580 flags &= ~EVBACKEND_KQUEUE;
1581 #endif
1582 #ifdef __APPLE__
1583 /* only select works correctly on that "unix-certified" platform */
1584 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1585 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1586 #endif
1587 #ifdef __FreeBSD__
1588 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1589 #endif
1590
1591 return flags;
1592 }
1593
1594 unsigned int
1595 ev_embeddable_backends (void)
1596 {
1597 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1598
1599 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1600 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1601 flags &= ~EVBACKEND_EPOLL;
1602
1603 return flags;
1604 }
1605
1606 unsigned int
1607 ev_backend (EV_P)
1608 {
1609 return backend;
1610 }
1611
1612 #if EV_FEATURE_API
1613 unsigned int
1614 ev_iteration (EV_P)
1615 {
1616 return loop_count;
1617 }
1618
1619 unsigned int
1620 ev_depth (EV_P)
1621 {
1622 return loop_depth;
1623 }
1624
1625 void
1626 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1627 {
1628 io_blocktime = interval;
1629 }
1630
1631 void
1632 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1633 {
1634 timeout_blocktime = interval;
1635 }
1636
1637 void
1638 ev_set_userdata (EV_P_ void *data)
1639 {
1640 userdata = data;
1641 }
1642
1643 void *
1644 ev_userdata (EV_P)
1645 {
1646 return userdata;
1647 }
1648
1649 void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1650 {
1651 invoke_cb = invoke_pending_cb;
1652 }
1653
1654 void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1655 {
1656 release_cb = release;
1657 acquire_cb = acquire;
1658 }
1659 #endif
1660
1661 /* initialise a loop structure, must be zero-initialised */
1662 static void noinline
1663 loop_init (EV_P_ unsigned int flags)
1664 {
1665 if (!backend)
1666 {
1667 origflags = flags;
1668
1669 #if EV_USE_REALTIME
1670 if (!have_realtime)
1671 {
1672 struct timespec ts;
1673
1674 if (!clock_gettime (CLOCK_REALTIME, &ts))
1675 have_realtime = 1;
1676 }
1677 #endif
1678
1679 #if EV_USE_MONOTONIC
1680 if (!have_monotonic)
1681 {
1682 struct timespec ts;
1683
1684 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1685 have_monotonic = 1;
1686 }
1687 #endif
1688
1689 /* pid check not overridable via env */
1690 #ifndef _WIN32
1691 if (flags & EVFLAG_FORKCHECK)
1692 curpid = getpid ();
1693 #endif
1694
1695 if (!(flags & EVFLAG_NOENV)
1696 && !enable_secure ()
1697 && getenv ("LIBEV_FLAGS"))
1698 flags = atoi (getenv ("LIBEV_FLAGS"));
1699
1700 ev_rt_now = ev_time ();
1701 mn_now = get_clock ();
1702 now_floor = mn_now;
1703 rtmn_diff = ev_rt_now - mn_now;
1704 #if EV_FEATURE_API
1705 invoke_cb = ev_invoke_pending;
1706 #endif
1707
1708 io_blocktime = 0.;
1709 timeout_blocktime = 0.;
1710 backend = 0;
1711 backend_fd = -1;
1712 sig_pending = 0;
1713 #if EV_ASYNC_ENABLE
1714 async_pending = 0;
1715 #endif
1716 #if EV_USE_INOTIFY
1717 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1718 #endif
1719 #if EV_USE_SIGNALFD
1720 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1721 #endif
1722
1723 if (!(flags & EVBACKEND_MASK))
1724 flags |= ev_recommended_backends ();
1725
1726 #if EV_USE_IOCP
1727 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1728 #endif
1729 #if EV_USE_PORT
1730 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1731 #endif
1732 #if EV_USE_KQUEUE
1733 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1734 #endif
1735 #if EV_USE_EPOLL
1736 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1737 #endif
1738 #if EV_USE_POLL
1739 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1740 #endif
1741 #if EV_USE_SELECT
1742 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1743 #endif
1744
1745 ev_prepare_init (&pending_w, pendingcb);
1746
1747 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1748 ev_init (&pipe_w, pipecb);
1749 ev_set_priority (&pipe_w, EV_MAXPRI);
1750 #endif
1751 }
1752 }
1753
1754 /* free up a loop structure */
1755 void
1756 ev_loop_destroy (EV_P)
1757 {
1758 int i;
1759
1760 #if EV_MULTIPLICITY
1761 /* mimic free (0) */
1762 if (!EV_A)
1763 return;
1764 #endif
1765
1766 #if EV_CLEANUP_ENABLE
1767 /* queue cleanup watchers (and execute them) */
1768 if (expect_false (cleanupcnt))
1769 {
1770 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1771 EV_INVOKE_PENDING;
1772 }
1773 #endif
1774
1775 #if EV_CHILD_ENABLE
1776 if (ev_is_active (&childev))
1777 {
1778 ev_ref (EV_A); /* child watcher */
1779 ev_signal_stop (EV_A_ &childev);
1780 }
1781 #endif
1782
1783 if (ev_is_active (&pipe_w))
1784 {
1785 /*ev_ref (EV_A);*/
1786 /*ev_io_stop (EV_A_ &pipe_w);*/
1787
1788 #if EV_USE_EVENTFD
1789 if (evfd >= 0)
1790 close (evfd);
1791 #endif
1792
1793 if (evpipe [0] >= 0)
1794 {
1795 EV_WIN32_CLOSE_FD (evpipe [0]);
1796 EV_WIN32_CLOSE_FD (evpipe [1]);
1797 }
1798 }
1799
1800 #if EV_USE_SIGNALFD
1801 if (ev_is_active (&sigfd_w))
1802 close (sigfd);
1803 #endif
1804
1805 #if EV_USE_INOTIFY
1806 if (fs_fd >= 0)
1807 close (fs_fd);
1808 #endif
1809
1810 if (backend_fd >= 0)
1811 close (backend_fd);
1812
1813 #if EV_USE_IOCP
1814 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1815 #endif
1816 #if EV_USE_PORT
1817 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1818 #endif
1819 #if EV_USE_KQUEUE
1820 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1821 #endif
1822 #if EV_USE_EPOLL
1823 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1824 #endif
1825 #if EV_USE_POLL
1826 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1827 #endif
1828 #if EV_USE_SELECT
1829 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1830 #endif
1831
1832 for (i = NUMPRI; i--; )
1833 {
1834 array_free (pending, [i]);
1835 #if EV_IDLE_ENABLE
1836 array_free (idle, [i]);
1837 #endif
1838 }
1839
1840 ev_free (anfds); anfds = 0; anfdmax = 0;
1841
1842 /* have to use the microsoft-never-gets-it-right macro */
1843 array_free (rfeed, EMPTY);
1844 array_free (fdchange, EMPTY);
1845 array_free (timer, EMPTY);
1846 #if EV_PERIODIC_ENABLE
1847 array_free (periodic, EMPTY);
1848 #endif
1849 #if EV_FORK_ENABLE
1850 array_free (fork, EMPTY);
1851 #endif
1852 #if EV_CLEANUP_ENABLE
1853 array_free (cleanup, EMPTY);
1854 #endif
1855 array_free (prepare, EMPTY);
1856 array_free (check, EMPTY);
1857 #if EV_ASYNC_ENABLE
1858 array_free (async, EMPTY);
1859 #endif
1860
1861 backend = 0;
1862
1863 #if EV_MULTIPLICITY
1864 if (ev_is_default_loop (EV_A))
1865 #endif
1866 ev_default_loop_ptr = 0;
1867 #if EV_MULTIPLICITY
1868 else
1869 ev_free (EV_A);
1870 #endif
1871 }
1872
1873 #if EV_USE_INOTIFY
1874 inline_size void infy_fork (EV_P);
1875 #endif
1876
1877 inline_size void
1878 loop_fork (EV_P)
1879 {
1880 #if EV_USE_PORT
1881 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1882 #endif
1883 #if EV_USE_KQUEUE
1884 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1885 #endif
1886 #if EV_USE_EPOLL
1887 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1888 #endif
1889 #if EV_USE_INOTIFY
1890 infy_fork (EV_A);
1891 #endif
1892
1893 if (ev_is_active (&pipe_w))
1894 {
1895 /* this "locks" the handlers against writing to the pipe */
1896 /* while we modify the fd vars */
1897 sig_pending = 1;
1898 #if EV_ASYNC_ENABLE
1899 async_pending = 1;
1900 #endif
1901
1902 ev_ref (EV_A);
1903 ev_io_stop (EV_A_ &pipe_w);
1904
1905 #if EV_USE_EVENTFD
1906 if (evfd >= 0)
1907 close (evfd);
1908 #endif
1909
1910 if (evpipe [0] >= 0)
1911 {
1912 EV_WIN32_CLOSE_FD (evpipe [0]);
1913 EV_WIN32_CLOSE_FD (evpipe [1]);
1914 }
1915
1916 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1917 evpipe_init (EV_A);
1918 /* now iterate over everything, in case we missed something */
1919 pipecb (EV_A_ &pipe_w, EV_READ);
1920 #endif
1921 }
1922
1923 postfork = 0;
1924 }
1925
1926 #if EV_MULTIPLICITY
1927
1928 struct ev_loop *
1929 ev_loop_new (unsigned int flags)
1930 {
1931 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1932
1933 memset (EV_A, 0, sizeof (struct ev_loop));
1934 loop_init (EV_A_ flags);
1935
1936 if (ev_backend (EV_A))
1937 return EV_A;
1938
1939 ev_free (EV_A);
1940 return 0;
1941 }
1942
1943 #endif /* multiplicity */
1944
1945 #if EV_VERIFY
1946 static void noinline
1947 verify_watcher (EV_P_ W w)
1948 {
1949 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1950
1951 if (w->pending)
1952 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1953 }
1954
1955 static void noinline
1956 verify_heap (EV_P_ ANHE *heap, int N)
1957 {
1958 int i;
1959
1960 for (i = HEAP0; i < N + HEAP0; ++i)
1961 {
1962 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1963 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1964 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1965
1966 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1967 }
1968 }
1969
1970 static void noinline
1971 array_verify (EV_P_ W *ws, int cnt)
1972 {
1973 while (cnt--)
1974 {
1975 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1976 verify_watcher (EV_A_ ws [cnt]);
1977 }
1978 }
1979 #endif
1980
1981 #if EV_FEATURE_API
1982 void
1983 ev_verify (EV_P)
1984 {
1985 #if EV_VERIFY
1986 int i;
1987 WL w;
1988
1989 assert (activecnt >= -1);
1990
1991 assert (fdchangemax >= fdchangecnt);
1992 for (i = 0; i < fdchangecnt; ++i)
1993 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1994
1995 assert (anfdmax >= 0);
1996 for (i = 0; i < anfdmax; ++i)
1997 for (w = anfds [i].head; w; w = w->next)
1998 {
1999 verify_watcher (EV_A_ (W)w);
2000 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2001 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2002 }
2003
2004 assert (timermax >= timercnt);
2005 verify_heap (EV_A_ timers, timercnt);
2006
2007 #if EV_PERIODIC_ENABLE
2008 assert (periodicmax >= periodiccnt);
2009 verify_heap (EV_A_ periodics, periodiccnt);
2010 #endif
2011
2012 for (i = NUMPRI; i--; )
2013 {
2014 assert (pendingmax [i] >= pendingcnt [i]);
2015 #if EV_IDLE_ENABLE
2016 assert (idleall >= 0);
2017 assert (idlemax [i] >= idlecnt [i]);
2018 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2019 #endif
2020 }
2021
2022 #if EV_FORK_ENABLE
2023 assert (forkmax >= forkcnt);
2024 array_verify (EV_A_ (W *)forks, forkcnt);
2025 #endif
2026
2027 #if EV_CLEANUP_ENABLE
2028 assert (cleanupmax >= cleanupcnt);
2029 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2030 #endif
2031
2032 #if EV_ASYNC_ENABLE
2033 assert (asyncmax >= asynccnt);
2034 array_verify (EV_A_ (W *)asyncs, asynccnt);
2035 #endif
2036
2037 #if EV_PREPARE_ENABLE
2038 assert (preparemax >= preparecnt);
2039 array_verify (EV_A_ (W *)prepares, preparecnt);
2040 #endif
2041
2042 #if EV_CHECK_ENABLE
2043 assert (checkmax >= checkcnt);
2044 array_verify (EV_A_ (W *)checks, checkcnt);
2045 #endif
2046
2047 # if 0
2048 #if EV_CHILD_ENABLE
2049 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2050 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2051 #endif
2052 # endif
2053 #endif
2054 }
2055 #endif
2056
2057 #if EV_MULTIPLICITY
2058 struct ev_loop *
2059 #else
2060 int
2061 #endif
2062 ev_default_loop (unsigned int flags)
2063 {
2064 if (!ev_default_loop_ptr)
2065 {
2066 #if EV_MULTIPLICITY
2067 EV_P = ev_default_loop_ptr = &default_loop_struct;
2068 #else
2069 ev_default_loop_ptr = 1;
2070 #endif
2071
2072 loop_init (EV_A_ flags);
2073
2074 if (ev_backend (EV_A))
2075 {
2076 #if EV_CHILD_ENABLE
2077 ev_signal_init (&childev, childcb, SIGCHLD);
2078 ev_set_priority (&childev, EV_MAXPRI);
2079 ev_signal_start (EV_A_ &childev);
2080 ev_unref (EV_A); /* child watcher should not keep loop alive */
2081 #endif
2082 }
2083 else
2084 ev_default_loop_ptr = 0;
2085 }
2086
2087 return ev_default_loop_ptr;
2088 }
2089
2090 void
2091 ev_loop_fork (EV_P)
2092 {
2093 postfork = 1; /* must be in line with ev_default_fork */
2094 }
2095
2096 /*****************************************************************************/
2097
2098 void
2099 ev_invoke (EV_P_ void *w, int revents)
2100 {
2101 EV_CB_INVOKE ((W)w, revents);
2102 }
2103
2104 unsigned int
2105 ev_pending_count (EV_P)
2106 {
2107 int pri;
2108 unsigned int count = 0;
2109
2110 for (pri = NUMPRI; pri--; )
2111 count += pendingcnt [pri];
2112
2113 return count;
2114 }
2115
2116 void noinline
2117 ev_invoke_pending (EV_P)
2118 {
2119 int pri;
2120
2121 for (pri = NUMPRI; pri--; )
2122 while (pendingcnt [pri])
2123 {
2124 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2125
2126 p->w->pending = 0;
2127 EV_CB_INVOKE (p->w, p->events);
2128 EV_FREQUENT_CHECK;
2129 }
2130 }
2131
2132 #if EV_IDLE_ENABLE
2133 /* make idle watchers pending. this handles the "call-idle */
2134 /* only when higher priorities are idle" logic */
2135 inline_size void
2136 idle_reify (EV_P)
2137 {
2138 if (expect_false (idleall))
2139 {
2140 int pri;
2141
2142 for (pri = NUMPRI; pri--; )
2143 {
2144 if (pendingcnt [pri])
2145 break;
2146
2147 if (idlecnt [pri])
2148 {
2149 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2150 break;
2151 }
2152 }
2153 }
2154 }
2155 #endif
2156
2157 /* make timers pending */
2158 inline_size void
2159 timers_reify (EV_P)
2160 {
2161 EV_FREQUENT_CHECK;
2162
2163 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2164 {
2165 do
2166 {
2167 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2168
2169 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2170
2171 /* first reschedule or stop timer */
2172 if (w->repeat)
2173 {
2174 ev_at (w) += w->repeat;
2175 if (ev_at (w) < mn_now)
2176 ev_at (w) = mn_now;
2177
2178 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2179
2180 ANHE_at_cache (timers [HEAP0]);
2181 downheap (timers, timercnt, HEAP0);
2182 }
2183 else
2184 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2185
2186 EV_FREQUENT_CHECK;
2187 feed_reverse (EV_A_ (W)w);
2188 }
2189 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2190
2191 feed_reverse_done (EV_A_ EV_TIMER);
2192 }
2193 }
2194
2195 #if EV_PERIODIC_ENABLE
2196 /* make periodics pending */
2197 inline_size void
2198 periodics_reify (EV_P)
2199 {
2200 EV_FREQUENT_CHECK;
2201
2202 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2203 {
2204 int feed_count = 0;
2205
2206 do
2207 {
2208 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2209
2210 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2211
2212 /* first reschedule or stop timer */
2213 if (w->reschedule_cb)
2214 {
2215 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2216
2217 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2218
2219 ANHE_at_cache (periodics [HEAP0]);
2220 downheap (periodics, periodiccnt, HEAP0);
2221 }
2222 else if (w->interval)
2223 {
2224 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2225 /* if next trigger time is not sufficiently in the future, put it there */
2226 /* this might happen because of floating point inexactness */
2227 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2228 {
2229 ev_at (w) += w->interval;
2230
2231 /* if interval is unreasonably low we might still have a time in the past */
2232 /* so correct this. this will make the periodic very inexact, but the user */
2233 /* has effectively asked to get triggered more often than possible */
2234 if (ev_at (w) < ev_rt_now)
2235 ev_at (w) = ev_rt_now;
2236 }
2237
2238 ANHE_at_cache (periodics [HEAP0]);
2239 downheap (periodics, periodiccnt, HEAP0);
2240 }
2241 else
2242 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2243
2244 EV_FREQUENT_CHECK;
2245 feed_reverse (EV_A_ (W)w);
2246 }
2247 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2248
2249 feed_reverse_done (EV_A_ EV_PERIODIC);
2250 }
2251 }
2252
2253 /* simply recalculate all periodics */
2254 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2255 static void noinline
2256 periodics_reschedule (EV_P)
2257 {
2258 int i;
2259
2260 /* adjust periodics after time jump */
2261 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2262 {
2263 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2264
2265 if (w->reschedule_cb)
2266 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2267 else if (w->interval)
2268 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2269
2270 ANHE_at_cache (periodics [i]);
2271 }
2272
2273 reheap (periodics, periodiccnt);
2274 }
2275 #endif
2276
2277 /* adjust all timers by a given offset */
2278 static void noinline
2279 timers_reschedule (EV_P_ ev_tstamp adjust)
2280 {
2281 int i;
2282
2283 for (i = 0; i < timercnt; ++i)
2284 {
2285 ANHE *he = timers + i + HEAP0;
2286 ANHE_w (*he)->at += adjust;
2287 ANHE_at_cache (*he);
2288 }
2289 }
2290
2291 /* fetch new monotonic and realtime times from the kernel */
2292 /* also detect if there was a timejump, and act accordingly */
2293 inline_speed void
2294 time_update (EV_P_ ev_tstamp max_block)
2295 {
2296 #if EV_USE_MONOTONIC
2297 if (expect_true (have_monotonic))
2298 {
2299 int i;
2300 ev_tstamp odiff = rtmn_diff;
2301
2302 mn_now = get_clock ();
2303
2304 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2305 /* interpolate in the meantime */
2306 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2307 {
2308 ev_rt_now = rtmn_diff + mn_now;
2309 return;
2310 }
2311
2312 now_floor = mn_now;
2313 ev_rt_now = ev_time ();
2314
2315 /* loop a few times, before making important decisions.
2316 * on the choice of "4": one iteration isn't enough,
2317 * in case we get preempted during the calls to
2318 * ev_time and get_clock. a second call is almost guaranteed
2319 * to succeed in that case, though. and looping a few more times
2320 * doesn't hurt either as we only do this on time-jumps or
2321 * in the unlikely event of having been preempted here.
2322 */
2323 for (i = 4; --i; )
2324 {
2325 rtmn_diff = ev_rt_now - mn_now;
2326
2327 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2328 return; /* all is well */
2329
2330 ev_rt_now = ev_time ();
2331 mn_now = get_clock ();
2332 now_floor = mn_now;
2333 }
2334
2335 /* no timer adjustment, as the monotonic clock doesn't jump */
2336 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2337 # if EV_PERIODIC_ENABLE
2338 periodics_reschedule (EV_A);
2339 # endif
2340 }
2341 else
2342 #endif
2343 {
2344 ev_rt_now = ev_time ();
2345
2346 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2347 {
2348 /* adjust timers. this is easy, as the offset is the same for all of them */
2349 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2350 #if EV_PERIODIC_ENABLE
2351 periodics_reschedule (EV_A);
2352 #endif
2353 }
2354
2355 mn_now = ev_rt_now;
2356 }
2357 }
2358
2359 void
2360 ev_run (EV_P_ int flags)
2361 {
2362 #if EV_FEATURE_API
2363 ++loop_depth;
2364 #endif
2365
2366 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2367
2368 loop_done = EVBREAK_CANCEL;
2369
2370 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2371
2372 do
2373 {
2374 #if EV_VERIFY >= 2
2375 ev_verify (EV_A);
2376 #endif
2377
2378 #ifndef _WIN32
2379 if (expect_false (curpid)) /* penalise the forking check even more */
2380 if (expect_false (getpid () != curpid))
2381 {
2382 curpid = getpid ();
2383 postfork = 1;
2384 }
2385 #endif
2386
2387 #if EV_FORK_ENABLE
2388 /* we might have forked, so queue fork handlers */
2389 if (expect_false (postfork))
2390 if (forkcnt)
2391 {
2392 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2393 EV_INVOKE_PENDING;
2394 }
2395 #endif
2396
2397 #if EV_PREPARE_ENABLE
2398 /* queue prepare watchers (and execute them) */
2399 if (expect_false (preparecnt))
2400 {
2401 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2402 EV_INVOKE_PENDING;
2403 }
2404 #endif
2405
2406 if (expect_false (loop_done))
2407 break;
2408
2409 /* we might have forked, so reify kernel state if necessary */
2410 if (expect_false (postfork))
2411 loop_fork (EV_A);
2412
2413 /* update fd-related kernel structures */
2414 fd_reify (EV_A);
2415
2416 /* calculate blocking time */
2417 {
2418 ev_tstamp waittime = 0.;
2419 ev_tstamp sleeptime = 0.;
2420
2421 /* remember old timestamp for io_blocktime calculation */
2422 ev_tstamp prev_mn_now = mn_now;
2423
2424 /* update time to cancel out callback processing overhead */
2425 time_update (EV_A_ 1e100);
2426
2427 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt)))
2428 {
2429 waittime = MAX_BLOCKTIME;
2430
2431 if (timercnt)
2432 {
2433 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2434 if (waittime > to) waittime = to;
2435 }
2436
2437 #if EV_PERIODIC_ENABLE
2438 if (periodiccnt)
2439 {
2440 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2441 if (waittime > to) waittime = to;
2442 }
2443 #endif
2444
2445 /* don't let timeouts decrease the waittime below timeout_blocktime */
2446 if (expect_false (waittime < timeout_blocktime))
2447 waittime = timeout_blocktime;
2448
2449 /* extra check because io_blocktime is commonly 0 */
2450 if (expect_false (io_blocktime))
2451 {
2452 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2453
2454 if (sleeptime > waittime - backend_fudge)
2455 sleeptime = waittime - backend_fudge;
2456
2457 if (expect_true (sleeptime > 0.))
2458 {
2459 ev_sleep (sleeptime);
2460 waittime -= sleeptime;
2461 }
2462 }
2463 }
2464
2465 #if EV_FEATURE_API
2466 ++loop_count;
2467 #endif
2468 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2469 backend_poll (EV_A_ waittime);
2470 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2471
2472 /* update ev_rt_now, do magic */
2473 time_update (EV_A_ waittime + sleeptime);
2474 }
2475
2476 /* queue pending timers and reschedule them */
2477 timers_reify (EV_A); /* relative timers called last */
2478 #if EV_PERIODIC_ENABLE
2479 periodics_reify (EV_A); /* absolute timers called first */
2480 #endif
2481
2482 #if EV_IDLE_ENABLE
2483 /* queue idle watchers unless other events are pending */
2484 idle_reify (EV_A);
2485 #endif
2486
2487 #if EV_CHECK_ENABLE
2488 /* queue check watchers, to be executed first */
2489 if (expect_false (checkcnt))
2490 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2491 #endif
2492
2493 EV_INVOKE_PENDING;
2494 }
2495 while (expect_true (
2496 activecnt
2497 && !loop_done
2498 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2499 ));
2500
2501 if (loop_done == EVBREAK_ONE)
2502 loop_done = EVBREAK_CANCEL;
2503
2504 #if EV_FEATURE_API
2505 --loop_depth;
2506 #endif
2507 }
2508
2509 void
2510 ev_break (EV_P_ int how)
2511 {
2512 loop_done = how;
2513 }
2514
2515 void
2516 ev_ref (EV_P)
2517 {
2518 ++activecnt;
2519 }
2520
2521 void
2522 ev_unref (EV_P)
2523 {
2524 --activecnt;
2525 }
2526
2527 void
2528 ev_now_update (EV_P)
2529 {
2530 time_update (EV_A_ 1e100);
2531 }
2532
2533 void
2534 ev_suspend (EV_P)
2535 {
2536 ev_now_update (EV_A);
2537 }
2538
2539 void
2540 ev_resume (EV_P)
2541 {
2542 ev_tstamp mn_prev = mn_now;
2543
2544 ev_now_update (EV_A);
2545 timers_reschedule (EV_A_ mn_now - mn_prev);
2546 #if EV_PERIODIC_ENABLE
2547 /* TODO: really do this? */
2548 periodics_reschedule (EV_A);
2549 #endif
2550 }
2551
2552 /*****************************************************************************/
2553 /* singly-linked list management, used when the expected list length is short */
2554
2555 inline_size void
2556 wlist_add (WL *head, WL elem)
2557 {
2558 elem->next = *head;
2559 *head = elem;
2560 }
2561
2562 inline_size void
2563 wlist_del (WL *head, WL elem)
2564 {
2565 while (*head)
2566 {
2567 if (expect_true (*head == elem))
2568 {
2569 *head = elem->next;
2570 break;
2571 }
2572
2573 head = &(*head)->next;
2574 }
2575 }
2576
2577 /* internal, faster, version of ev_clear_pending */
2578 inline_speed void
2579 clear_pending (EV_P_ W w)
2580 {
2581 if (w->pending)
2582 {
2583 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2584 w->pending = 0;
2585 }
2586 }
2587
2588 int
2589 ev_clear_pending (EV_P_ void *w)
2590 {
2591 W w_ = (W)w;
2592 int pending = w_->pending;
2593
2594 if (expect_true (pending))
2595 {
2596 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2597 p->w = (W)&pending_w;
2598 w_->pending = 0;
2599 return p->events;
2600 }
2601 else
2602 return 0;
2603 }
2604
2605 inline_size void
2606 pri_adjust (EV_P_ W w)
2607 {
2608 int pri = ev_priority (w);
2609 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2610 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2611 ev_set_priority (w, pri);
2612 }
2613
2614 inline_speed void
2615 ev_start (EV_P_ W w, int active)
2616 {
2617 pri_adjust (EV_A_ w);
2618 w->active = active;
2619 ev_ref (EV_A);
2620 }
2621
2622 inline_size void
2623 ev_stop (EV_P_ W w)
2624 {
2625 ev_unref (EV_A);
2626 w->active = 0;
2627 }
2628
2629 /*****************************************************************************/
2630
2631 void noinline
2632 ev_io_start (EV_P_ ev_io *w)
2633 {
2634 int fd = w->fd;
2635
2636 if (expect_false (ev_is_active (w)))
2637 return;
2638
2639 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2640 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2641
2642 EV_FREQUENT_CHECK;
2643
2644 ev_start (EV_A_ (W)w, 1);
2645 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2646 wlist_add (&anfds[fd].head, (WL)w);
2647
2648 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2649 w->events &= ~EV__IOFDSET;
2650
2651 EV_FREQUENT_CHECK;
2652 }
2653
2654 void noinline
2655 ev_io_stop (EV_P_ ev_io *w)
2656 {
2657 clear_pending (EV_A_ (W)w);
2658 if (expect_false (!ev_is_active (w)))
2659 return;
2660
2661 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2662
2663 EV_FREQUENT_CHECK;
2664
2665 wlist_del (&anfds[w->fd].head, (WL)w);
2666 ev_stop (EV_A_ (W)w);
2667
2668 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2669
2670 EV_FREQUENT_CHECK;
2671 }
2672
2673 void noinline
2674 ev_timer_start (EV_P_ ev_timer *w)
2675 {
2676 if (expect_false (ev_is_active (w)))
2677 return;
2678
2679 ev_at (w) += mn_now;
2680
2681 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2682
2683 EV_FREQUENT_CHECK;
2684
2685 ++timercnt;
2686 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2687 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2688 ANHE_w (timers [ev_active (w)]) = (WT)w;
2689 ANHE_at_cache (timers [ev_active (w)]);
2690 upheap (timers, ev_active (w));
2691
2692 EV_FREQUENT_CHECK;
2693
2694 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2695 }
2696
2697 void noinline
2698 ev_timer_stop (EV_P_ ev_timer *w)
2699 {
2700 clear_pending (EV_A_ (W)w);
2701 if (expect_false (!ev_is_active (w)))
2702 return;
2703
2704 EV_FREQUENT_CHECK;
2705
2706 {
2707 int active = ev_active (w);
2708
2709 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2710
2711 --timercnt;
2712
2713 if (expect_true (active < timercnt + HEAP0))
2714 {
2715 timers [active] = timers [timercnt + HEAP0];
2716 adjustheap (timers, timercnt, active);
2717 }
2718 }
2719
2720 ev_at (w) -= mn_now;
2721
2722 ev_stop (EV_A_ (W)w);
2723
2724 EV_FREQUENT_CHECK;
2725 }
2726
2727 void noinline
2728 ev_timer_again (EV_P_ ev_timer *w)
2729 {
2730 EV_FREQUENT_CHECK;
2731
2732 if (ev_is_active (w))
2733 {
2734 if (w->repeat)
2735 {
2736 ev_at (w) = mn_now + w->repeat;
2737 ANHE_at_cache (timers [ev_active (w)]);
2738 adjustheap (timers, timercnt, ev_active (w));
2739 }
2740 else
2741 ev_timer_stop (EV_A_ w);
2742 }
2743 else if (w->repeat)
2744 {
2745 ev_at (w) = w->repeat;
2746 ev_timer_start (EV_A_ w);
2747 }
2748
2749 EV_FREQUENT_CHECK;
2750 }
2751
2752 ev_tstamp
2753 ev_timer_remaining (EV_P_ ev_timer *w)
2754 {
2755 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2756 }
2757
2758 #if EV_PERIODIC_ENABLE
2759 void noinline
2760 ev_periodic_start (EV_P_ ev_periodic *w)
2761 {
2762 if (expect_false (ev_is_active (w)))
2763 return;
2764
2765 if (w->reschedule_cb)
2766 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2767 else if (w->interval)
2768 {
2769 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2770 /* this formula differs from the one in periodic_reify because we do not always round up */
2771 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2772 }
2773 else
2774 ev_at (w) = w->offset;
2775
2776 EV_FREQUENT_CHECK;
2777
2778 ++periodiccnt;
2779 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2780 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2781 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2782 ANHE_at_cache (periodics [ev_active (w)]);
2783 upheap (periodics, ev_active (w));
2784
2785 EV_FREQUENT_CHECK;
2786
2787 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2788 }
2789
2790 void noinline
2791 ev_periodic_stop (EV_P_ ev_periodic *w)
2792 {
2793 clear_pending (EV_A_ (W)w);
2794 if (expect_false (!ev_is_active (w)))
2795 return;
2796
2797 EV_FREQUENT_CHECK;
2798
2799 {
2800 int active = ev_active (w);
2801
2802 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2803
2804 --periodiccnt;
2805
2806 if (expect_true (active < periodiccnt + HEAP0))
2807 {
2808 periodics [active] = periodics [periodiccnt + HEAP0];
2809 adjustheap (periodics, periodiccnt, active);
2810 }
2811 }
2812
2813 ev_stop (EV_A_ (W)w);
2814
2815 EV_FREQUENT_CHECK;
2816 }
2817
2818 void noinline
2819 ev_periodic_again (EV_P_ ev_periodic *w)
2820 {
2821 /* TODO: use adjustheap and recalculation */
2822 ev_periodic_stop (EV_A_ w);
2823 ev_periodic_start (EV_A_ w);
2824 }
2825 #endif
2826
2827 #ifndef SA_RESTART
2828 # define SA_RESTART 0
2829 #endif
2830
2831 #if EV_SIGNAL_ENABLE
2832
2833 void noinline
2834 ev_signal_start (EV_P_ ev_signal *w)
2835 {
2836 if (expect_false (ev_is_active (w)))
2837 return;
2838
2839 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2840
2841 #if EV_MULTIPLICITY
2842 assert (("libev: a signal must not be attached to two different loops",
2843 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2844
2845 signals [w->signum - 1].loop = EV_A;
2846 #endif
2847
2848 EV_FREQUENT_CHECK;
2849
2850 #if EV_USE_SIGNALFD
2851 if (sigfd == -2)
2852 {
2853 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2854 if (sigfd < 0 && errno == EINVAL)
2855 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2856
2857 if (sigfd >= 0)
2858 {
2859 fd_intern (sigfd); /* doing it twice will not hurt */
2860
2861 sigemptyset (&sigfd_set);
2862
2863 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2864 ev_set_priority (&sigfd_w, EV_MAXPRI);
2865 ev_io_start (EV_A_ &sigfd_w);
2866 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2867 }
2868 }
2869
2870 if (sigfd >= 0)
2871 {
2872 /* TODO: check .head */
2873 sigaddset (&sigfd_set, w->signum);
2874 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2875
2876 signalfd (sigfd, &sigfd_set, 0);
2877 }
2878 #endif
2879
2880 ev_start (EV_A_ (W)w, 1);
2881 wlist_add (&signals [w->signum - 1].head, (WL)w);
2882
2883 if (!((WL)w)->next)
2884 # if EV_USE_SIGNALFD
2885 if (sigfd < 0) /*TODO*/
2886 # endif
2887 {
2888 # ifdef _WIN32
2889 evpipe_init (EV_A);
2890
2891 signal (w->signum, ev_sighandler);
2892 # else
2893 struct sigaction sa;
2894
2895 evpipe_init (EV_A);
2896
2897 sa.sa_handler = ev_sighandler;
2898 sigfillset (&sa.sa_mask);
2899 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2900 sigaction (w->signum, &sa, 0);
2901
2902 if (origflags & EVFLAG_NOSIGMASK)
2903 {
2904 sigemptyset (&sa.sa_mask);
2905 sigaddset (&sa.sa_mask, w->signum);
2906 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2907 }
2908 #endif
2909 }
2910
2911 EV_FREQUENT_CHECK;
2912 }
2913
2914 void noinline
2915 ev_signal_stop (EV_P_ ev_signal *w)
2916 {
2917 clear_pending (EV_A_ (W)w);
2918 if (expect_false (!ev_is_active (w)))
2919 return;
2920
2921 EV_FREQUENT_CHECK;
2922
2923 wlist_del (&signals [w->signum - 1].head, (WL)w);
2924 ev_stop (EV_A_ (W)w);
2925
2926 if (!signals [w->signum - 1].head)
2927 {
2928 #if EV_MULTIPLICITY
2929 signals [w->signum - 1].loop = 0; /* unattach from signal */
2930 #endif
2931 #if EV_USE_SIGNALFD
2932 if (sigfd >= 0)
2933 {
2934 sigset_t ss;
2935
2936 sigemptyset (&ss);
2937 sigaddset (&ss, w->signum);
2938 sigdelset (&sigfd_set, w->signum);
2939
2940 signalfd (sigfd, &sigfd_set, 0);
2941 sigprocmask (SIG_UNBLOCK, &ss, 0);
2942 }
2943 else
2944 #endif
2945 signal (w->signum, SIG_DFL);
2946 }
2947
2948 EV_FREQUENT_CHECK;
2949 }
2950
2951 #endif
2952
2953 #if EV_CHILD_ENABLE
2954
2955 void
2956 ev_child_start (EV_P_ ev_child *w)
2957 {
2958 #if EV_MULTIPLICITY
2959 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2960 #endif
2961 if (expect_false (ev_is_active (w)))
2962 return;
2963
2964 EV_FREQUENT_CHECK;
2965
2966 ev_start (EV_A_ (W)w, 1);
2967 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2968
2969 EV_FREQUENT_CHECK;
2970 }
2971
2972 void
2973 ev_child_stop (EV_P_ ev_child *w)
2974 {
2975 clear_pending (EV_A_ (W)w);
2976 if (expect_false (!ev_is_active (w)))
2977 return;
2978
2979 EV_FREQUENT_CHECK;
2980
2981 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2982 ev_stop (EV_A_ (W)w);
2983
2984 EV_FREQUENT_CHECK;
2985 }
2986
2987 #endif
2988
2989 #if EV_STAT_ENABLE
2990
2991 # ifdef _WIN32
2992 # undef lstat
2993 # define lstat(a,b) _stati64 (a,b)
2994 # endif
2995
2996 #define DEF_STAT_INTERVAL 5.0074891
2997 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2998 #define MIN_STAT_INTERVAL 0.1074891
2999
3000 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3001
3002 #if EV_USE_INOTIFY
3003
3004 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3005 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3006
3007 static void noinline
3008 infy_add (EV_P_ ev_stat *w)
3009 {
3010 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);
3011
3012 if (w->wd >= 0)
3013 {
3014 struct statfs sfs;
3015
3016 /* now local changes will be tracked by inotify, but remote changes won't */
3017 /* unless the filesystem is known to be local, we therefore still poll */
3018 /* also do poll on <2.6.25, but with normal frequency */
3019
3020 if (!fs_2625)
3021 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3022 else if (!statfs (w->path, &sfs)
3023 && (sfs.f_type == 0x1373 /* devfs */
3024 || sfs.f_type == 0xEF53 /* ext2/3 */
3025 || sfs.f_type == 0x3153464a /* jfs */
3026 || sfs.f_type == 0x52654973 /* reiser3 */
3027 || sfs.f_type == 0x01021994 /* tempfs */
3028 || sfs.f_type == 0x58465342 /* xfs */))
3029 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3030 else
3031 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3032 }
3033 else
3034 {
3035 /* can't use inotify, continue to stat */
3036 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3037
3038 /* if path is not there, monitor some parent directory for speedup hints */
3039 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3040 /* but an efficiency issue only */
3041 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3042 {
3043 char path [4096];
3044 strcpy (path, w->path);
3045
3046 do
3047 {
3048 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3049 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3050
3051 char *pend = strrchr (path, '/');
3052
3053 if (!pend || pend == path)
3054 break;
3055
3056 *pend = 0;
3057 w->wd = inotify_add_watch (fs_fd, path, mask);
3058 }
3059 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3060 }
3061 }
3062
3063 if (w->wd >= 0)
3064 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3065
3066 /* now re-arm timer, if required */
3067 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3068 ev_timer_again (EV_A_ &w->timer);
3069 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3070 }
3071
3072 static void noinline
3073 infy_del (EV_P_ ev_stat *w)
3074 {
3075 int slot;
3076 int wd = w->wd;
3077
3078 if (wd < 0)
3079 return;
3080
3081 w->wd = -2;
3082 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3083 wlist_del (&fs_hash [slot].head, (WL)w);
3084
3085 /* remove this watcher, if others are watching it, they will rearm */
3086 inotify_rm_watch (fs_fd, wd);
3087 }
3088
3089 static void noinline
3090 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3091 {
3092 if (slot < 0)
3093 /* overflow, need to check for all hash slots */
3094 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3095 infy_wd (EV_A_ slot, wd, ev);
3096 else
3097 {
3098 WL w_;
3099
3100 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3101 {
3102 ev_stat *w = (ev_stat *)w_;
3103 w_ = w_->next; /* lets us remove this watcher and all before it */
3104
3105 if (w->wd == wd || wd == -1)
3106 {
3107 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3108 {
3109 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3110 w->wd = -1;
3111 infy_add (EV_A_ w); /* re-add, no matter what */
3112 }
3113
3114 stat_timer_cb (EV_A_ &w->timer, 0);
3115 }
3116 }
3117 }
3118 }
3119
3120 static void
3121 infy_cb (EV_P_ ev_io *w, int revents)
3122 {
3123 char buf [EV_INOTIFY_BUFSIZE];
3124 int ofs;
3125 int len = read (fs_fd, buf, sizeof (buf));
3126
3127 for (ofs = 0; ofs < len; )
3128 {
3129 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3130 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3131 ofs += sizeof (struct inotify_event) + ev->len;
3132 }
3133 }
3134
3135 inline_size void
3136 ev_check_2625 (EV_P)
3137 {
3138 /* kernels < 2.6.25 are borked
3139 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3140 */
3141 if (ev_linux_version () < 0x020619)
3142 return;
3143
3144 fs_2625 = 1;
3145 }
3146
3147 inline_size int
3148 infy_newfd (void)
3149 {
3150 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3151 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3152 if (fd >= 0)
3153 return fd;
3154 #endif
3155 return inotify_init ();
3156 }
3157
3158 inline_size void
3159 infy_init (EV_P)
3160 {
3161 if (fs_fd != -2)
3162 return;
3163
3164 fs_fd = -1;
3165
3166 ev_check_2625 (EV_A);
3167
3168 fs_fd = infy_newfd ();
3169
3170 if (fs_fd >= 0)
3171 {
3172 fd_intern (fs_fd);
3173 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3174 ev_set_priority (&fs_w, EV_MAXPRI);
3175 ev_io_start (EV_A_ &fs_w);
3176 ev_unref (EV_A);
3177 }
3178 }
3179
3180 inline_size void
3181 infy_fork (EV_P)
3182 {
3183 int slot;
3184
3185 if (fs_fd < 0)
3186 return;
3187
3188 ev_ref (EV_A);
3189 ev_io_stop (EV_A_ &fs_w);
3190 close (fs_fd);
3191 fs_fd = infy_newfd ();
3192
3193 if (fs_fd >= 0)
3194 {
3195 fd_intern (fs_fd);
3196 ev_io_set (&fs_w, fs_fd, EV_READ);
3197 ev_io_start (EV_A_ &fs_w);
3198 ev_unref (EV_A);
3199 }
3200
3201 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3202 {
3203 WL w_ = fs_hash [slot].head;
3204 fs_hash [slot].head = 0;
3205
3206 while (w_)
3207 {
3208 ev_stat *w = (ev_stat *)w_;
3209 w_ = w_->next; /* lets us add this watcher */
3210
3211 w->wd = -1;
3212
3213 if (fs_fd >= 0)
3214 infy_add (EV_A_ w); /* re-add, no matter what */
3215 else
3216 {
3217 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3218 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3219 ev_timer_again (EV_A_ &w->timer);
3220 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3221 }
3222 }
3223 }
3224 }
3225
3226 #endif
3227
3228 #ifdef _WIN32
3229 # define EV_LSTAT(p,b) _stati64 (p, b)
3230 #else
3231 # define EV_LSTAT(p,b) lstat (p, b)
3232 #endif
3233
3234 void
3235 ev_stat_stat (EV_P_ ev_stat *w)
3236 {
3237 if (lstat (w->path, &w->attr) < 0)
3238 w->attr.st_nlink = 0;
3239 else if (!w->attr.st_nlink)
3240 w->attr.st_nlink = 1;
3241 }
3242
3243 static void noinline
3244 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3245 {
3246 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3247
3248 ev_statdata prev = w->attr;
3249 ev_stat_stat (EV_A_ w);
3250
3251 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3252 if (
3253 prev.st_dev != w->attr.st_dev
3254 || prev.st_ino != w->attr.st_ino
3255 || prev.st_mode != w->attr.st_mode
3256 || prev.st_nlink != w->attr.st_nlink
3257 || prev.st_uid != w->attr.st_uid
3258 || prev.st_gid != w->attr.st_gid
3259 || prev.st_rdev != w->attr.st_rdev
3260 || prev.st_size != w->attr.st_size
3261 || prev.st_atime != w->attr.st_atime
3262 || prev.st_mtime != w->attr.st_mtime
3263 || prev.st_ctime != w->attr.st_ctime
3264 ) {
3265 /* we only update w->prev on actual differences */
3266 /* in case we test more often than invoke the callback, */
3267 /* to ensure that prev is always different to attr */
3268 w->prev = prev;
3269
3270 #if EV_USE_INOTIFY
3271 if (fs_fd >= 0)
3272 {
3273 infy_del (EV_A_ w);
3274 infy_add (EV_A_ w);
3275 ev_stat_stat (EV_A_ w); /* avoid race... */
3276 }
3277 #endif
3278
3279 ev_feed_event (EV_A_ w, EV_STAT);
3280 }
3281 }
3282
3283 void
3284 ev_stat_start (EV_P_ ev_stat *w)
3285 {
3286 if (expect_false (ev_is_active (w)))
3287 return;
3288
3289 ev_stat_stat (EV_A_ w);
3290
3291 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3292 w->interval = MIN_STAT_INTERVAL;
3293
3294 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3295 ev_set_priority (&w->timer, ev_priority (w));
3296
3297 #if EV_USE_INOTIFY
3298 infy_init (EV_A);
3299
3300 if (fs_fd >= 0)
3301 infy_add (EV_A_ w);
3302 else
3303 #endif
3304 {
3305 ev_timer_again (EV_A_ &w->timer);
3306 ev_unref (EV_A);
3307 }
3308
3309 ev_start (EV_A_ (W)w, 1);
3310
3311 EV_FREQUENT_CHECK;
3312 }
3313
3314 void
3315 ev_stat_stop (EV_P_ ev_stat *w)
3316 {
3317 clear_pending (EV_A_ (W)w);
3318 if (expect_false (!ev_is_active (w)))
3319 return;
3320
3321 EV_FREQUENT_CHECK;
3322
3323 #if EV_USE_INOTIFY
3324 infy_del (EV_A_ w);
3325 #endif
3326
3327 if (ev_is_active (&w->timer))
3328 {
3329 ev_ref (EV_A);
3330 ev_timer_stop (EV_A_ &w->timer);
3331 }
3332
3333 ev_stop (EV_A_ (W)w);
3334
3335 EV_FREQUENT_CHECK;
3336 }
3337 #endif
3338
3339 #if EV_IDLE_ENABLE
3340 void
3341 ev_idle_start (EV_P_ ev_idle *w)
3342 {
3343 if (expect_false (ev_is_active (w)))
3344 return;
3345
3346 pri_adjust (EV_A_ (W)w);
3347
3348 EV_FREQUENT_CHECK;
3349
3350 {
3351 int active = ++idlecnt [ABSPRI (w)];
3352
3353 ++idleall;
3354 ev_start (EV_A_ (W)w, active);
3355
3356 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3357 idles [ABSPRI (w)][active - 1] = w;
3358 }
3359
3360 EV_FREQUENT_CHECK;
3361 }
3362
3363 void
3364 ev_idle_stop (EV_P_ ev_idle *w)
3365 {
3366 clear_pending (EV_A_ (W)w);
3367 if (expect_false (!ev_is_active (w)))
3368 return;
3369
3370 EV_FREQUENT_CHECK;
3371
3372 {
3373 int active = ev_active (w);
3374
3375 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3376 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3377
3378 ev_stop (EV_A_ (W)w);
3379 --idleall;
3380 }
3381
3382 EV_FREQUENT_CHECK;
3383 }
3384 #endif
3385
3386 #if EV_PREPARE_ENABLE
3387 void
3388 ev_prepare_start (EV_P_ ev_prepare *w)
3389 {
3390 if (expect_false (ev_is_active (w)))
3391 return;
3392
3393 EV_FREQUENT_CHECK;
3394
3395 ev_start (EV_A_ (W)w, ++preparecnt);
3396 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3397 prepares [preparecnt - 1] = w;
3398
3399 EV_FREQUENT_CHECK;
3400 }
3401
3402 void
3403 ev_prepare_stop (EV_P_ ev_prepare *w)
3404 {
3405 clear_pending (EV_A_ (W)w);
3406 if (expect_false (!ev_is_active (w)))
3407 return;
3408
3409 EV_FREQUENT_CHECK;
3410
3411 {
3412 int active = ev_active (w);
3413
3414 prepares [active - 1] = prepares [--preparecnt];
3415 ev_active (prepares [active - 1]) = active;
3416 }
3417
3418 ev_stop (EV_A_ (W)w);
3419
3420 EV_FREQUENT_CHECK;
3421 }
3422 #endif
3423
3424 #if EV_CHECK_ENABLE
3425 void
3426 ev_check_start (EV_P_ ev_check *w)
3427 {
3428 if (expect_false (ev_is_active (w)))
3429 return;
3430
3431 EV_FREQUENT_CHECK;
3432
3433 ev_start (EV_A_ (W)w, ++checkcnt);
3434 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3435 checks [checkcnt - 1] = w;
3436
3437 EV_FREQUENT_CHECK;
3438 }
3439
3440 void
3441 ev_check_stop (EV_P_ ev_check *w)
3442 {
3443 clear_pending (EV_A_ (W)w);
3444 if (expect_false (!ev_is_active (w)))
3445 return;
3446
3447 EV_FREQUENT_CHECK;
3448
3449 {
3450 int active = ev_active (w);
3451
3452 checks [active - 1] = checks [--checkcnt];
3453 ev_active (checks [active - 1]) = active;
3454 }
3455
3456 ev_stop (EV_A_ (W)w);
3457
3458 EV_FREQUENT_CHECK;
3459 }
3460 #endif
3461
3462 #if EV_EMBED_ENABLE
3463 void noinline
3464 ev_embed_sweep (EV_P_ ev_embed *w)
3465 {
3466 ev_run (w->other, EVRUN_NOWAIT);
3467 }
3468
3469 static void
3470 embed_io_cb (EV_P_ ev_io *io, int revents)
3471 {
3472 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3473
3474 if (ev_cb (w))
3475 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3476 else
3477 ev_run (w->other, EVRUN_NOWAIT);
3478 }
3479
3480 static void
3481 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3482 {
3483 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3484
3485 {
3486 EV_P = w->other;
3487
3488 while (fdchangecnt)
3489 {
3490 fd_reify (EV_A);
3491 ev_run (EV_A_ EVRUN_NOWAIT);
3492 }
3493 }
3494 }
3495
3496 static void
3497 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3498 {
3499 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3500
3501 ev_embed_stop (EV_A_ w);
3502
3503 {
3504 EV_P = w->other;
3505
3506 ev_loop_fork (EV_A);
3507 ev_run (EV_A_ EVRUN_NOWAIT);
3508 }
3509
3510 ev_embed_start (EV_A_ w);
3511 }
3512
3513 #if 0
3514 static void
3515 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3516 {
3517 ev_idle_stop (EV_A_ idle);
3518 }
3519 #endif
3520
3521 void
3522 ev_embed_start (EV_P_ ev_embed *w)
3523 {
3524 if (expect_false (ev_is_active (w)))
3525 return;
3526
3527 {
3528 EV_P = w->other;
3529 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3530 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3531 }
3532
3533 EV_FREQUENT_CHECK;
3534
3535 ev_set_priority (&w->io, ev_priority (w));
3536 ev_io_start (EV_A_ &w->io);
3537
3538 ev_prepare_init (&w->prepare, embed_prepare_cb);
3539 ev_set_priority (&w->prepare, EV_MINPRI);
3540 ev_prepare_start (EV_A_ &w->prepare);
3541
3542 ev_fork_init (&w->fork, embed_fork_cb);
3543 ev_fork_start (EV_A_ &w->fork);
3544
3545 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3546
3547 ev_start (EV_A_ (W)w, 1);
3548
3549 EV_FREQUENT_CHECK;
3550 }
3551
3552 void
3553 ev_embed_stop (EV_P_ ev_embed *w)
3554 {
3555 clear_pending (EV_A_ (W)w);
3556 if (expect_false (!ev_is_active (w)))
3557 return;
3558
3559 EV_FREQUENT_CHECK;
3560
3561 ev_io_stop (EV_A_ &w->io);
3562 ev_prepare_stop (EV_A_ &w->prepare);
3563 ev_fork_stop (EV_A_ &w->fork);
3564
3565 ev_stop (EV_A_ (W)w);
3566
3567 EV_FREQUENT_CHECK;
3568 }
3569 #endif
3570
3571 #if EV_FORK_ENABLE
3572 void
3573 ev_fork_start (EV_P_ ev_fork *w)
3574 {
3575 if (expect_false (ev_is_active (w)))
3576 return;
3577
3578 EV_FREQUENT_CHECK;
3579
3580 ev_start (EV_A_ (W)w, ++forkcnt);
3581 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3582 forks [forkcnt - 1] = w;
3583
3584 EV_FREQUENT_CHECK;
3585 }
3586
3587 void
3588 ev_fork_stop (EV_P_ ev_fork *w)
3589 {
3590 clear_pending (EV_A_ (W)w);
3591 if (expect_false (!ev_is_active (w)))
3592 return;
3593
3594 EV_FREQUENT_CHECK;
3595
3596 {
3597 int active = ev_active (w);
3598
3599 forks [active - 1] = forks [--forkcnt];
3600 ev_active (forks [active - 1]) = active;
3601 }
3602
3603 ev_stop (EV_A_ (W)w);
3604
3605 EV_FREQUENT_CHECK;
3606 }
3607 #endif
3608
3609 #if EV_CLEANUP_ENABLE
3610 void
3611 ev_cleanup_start (EV_P_ ev_cleanup *w)
3612 {
3613 if (expect_false (ev_is_active (w)))
3614 return;
3615
3616 EV_FREQUENT_CHECK;
3617
3618 ev_start (EV_A_ (W)w, ++cleanupcnt);
3619 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3620 cleanups [cleanupcnt - 1] = w;
3621
3622 /* cleanup watchers should never keep a refcount on the loop */
3623 ev_unref (EV_A);
3624 EV_FREQUENT_CHECK;
3625 }
3626
3627 void
3628 ev_cleanup_stop (EV_P_ ev_cleanup *w)
3629 {
3630 clear_pending (EV_A_ (W)w);
3631 if (expect_false (!ev_is_active (w)))
3632 return;
3633
3634 EV_FREQUENT_CHECK;
3635 ev_ref (EV_A);
3636
3637 {
3638 int active = ev_active (w);
3639
3640 cleanups [active - 1] = cleanups [--cleanupcnt];
3641 ev_active (cleanups [active - 1]) = active;
3642 }
3643
3644 ev_stop (EV_A_ (W)w);
3645
3646 EV_FREQUENT_CHECK;
3647 }
3648 #endif
3649
3650 #if EV_ASYNC_ENABLE
3651 void
3652 ev_async_start (EV_P_ ev_async *w)
3653 {
3654 if (expect_false (ev_is_active (w)))
3655 return;
3656
3657 w->sent = 0;
3658
3659 evpipe_init (EV_A);
3660
3661 EV_FREQUENT_CHECK;
3662
3663 ev_start (EV_A_ (W)w, ++asynccnt);
3664 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3665 asyncs [asynccnt - 1] = w;
3666
3667 EV_FREQUENT_CHECK;
3668 }
3669
3670 void
3671 ev_async_stop (EV_P_ ev_async *w)
3672 {
3673 clear_pending (EV_A_ (W)w);
3674 if (expect_false (!ev_is_active (w)))
3675 return;
3676
3677 EV_FREQUENT_CHECK;
3678
3679 {
3680 int active = ev_active (w);
3681
3682 asyncs [active - 1] = asyncs [--asynccnt];
3683 ev_active (asyncs [active - 1]) = active;
3684 }
3685
3686 ev_stop (EV_A_ (W)w);
3687
3688 EV_FREQUENT_CHECK;
3689 }
3690
3691 void
3692 ev_async_send (EV_P_ ev_async *w)
3693 {
3694 w->sent = 1;
3695 evpipe_write (EV_A_ &async_pending);
3696 }
3697 #endif
3698
3699 /*****************************************************************************/
3700
3701 struct ev_once
3702 {
3703 ev_io io;
3704 ev_timer to;
3705 void (*cb)(int revents, void *arg);
3706 void *arg;
3707 };
3708
3709 static void
3710 once_cb (EV_P_ struct ev_once *once, int revents)
3711 {
3712 void (*cb)(int revents, void *arg) = once->cb;
3713 void *arg = once->arg;
3714
3715 ev_io_stop (EV_A_ &once->io);
3716 ev_timer_stop (EV_A_ &once->to);
3717 ev_free (once);
3718
3719 cb (revents, arg);
3720 }
3721
3722 static void
3723 once_cb_io (EV_P_ ev_io *w, int revents)
3724 {
3725 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3726
3727 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3728 }
3729
3730 static void
3731 once_cb_to (EV_P_ ev_timer *w, int revents)
3732 {
3733 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3734
3735 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3736 }
3737
3738 void
3739 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3740 {
3741 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3742
3743 if (expect_false (!once))
3744 {
3745 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3746 return;
3747 }
3748
3749 once->cb = cb;
3750 once->arg = arg;
3751
3752 ev_init (&once->io, once_cb_io);
3753 if (fd >= 0)
3754 {
3755 ev_io_set (&once->io, fd, events);
3756 ev_io_start (EV_A_ &once->io);
3757 }
3758
3759 ev_init (&once->to, once_cb_to);
3760 if (timeout >= 0.)
3761 {
3762 ev_timer_set (&once->to, timeout, 0.);
3763 ev_timer_start (EV_A_ &once->to);
3764 }
3765 }
3766
3767 /*****************************************************************************/
3768
3769 #if EV_WALK_ENABLE
3770 void
3771 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3772 {
3773 int i, j;
3774 ev_watcher_list *wl, *wn;
3775
3776 if (types & (EV_IO | EV_EMBED))
3777 for (i = 0; i < anfdmax; ++i)
3778 for (wl = anfds [i].head; wl; )
3779 {
3780 wn = wl->next;
3781
3782 #if EV_EMBED_ENABLE
3783 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3784 {
3785 if (types & EV_EMBED)
3786 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3787 }
3788 else
3789 #endif
3790 #if EV_USE_INOTIFY
3791 if (ev_cb ((ev_io *)wl) == infy_cb)
3792 ;
3793 else
3794 #endif
3795 if ((ev_io *)wl != &pipe_w)
3796 if (types & EV_IO)
3797 cb (EV_A_ EV_IO, wl);
3798
3799 wl = wn;
3800 }
3801
3802 if (types & (EV_TIMER | EV_STAT))
3803 for (i = timercnt + HEAP0; i-- > HEAP0; )
3804 #if EV_STAT_ENABLE
3805 /*TODO: timer is not always active*/
3806 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3807 {
3808 if (types & EV_STAT)
3809 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3810 }
3811 else
3812 #endif
3813 if (types & EV_TIMER)
3814 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3815
3816 #if EV_PERIODIC_ENABLE
3817 if (types & EV_PERIODIC)
3818 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3819 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3820 #endif
3821
3822 #if EV_IDLE_ENABLE
3823 if (types & EV_IDLE)
3824 for (j = NUMPRI; i--; )
3825 for (i = idlecnt [j]; i--; )
3826 cb (EV_A_ EV_IDLE, idles [j][i]);
3827 #endif
3828
3829 #if EV_FORK_ENABLE
3830 if (types & EV_FORK)
3831 for (i = forkcnt; i--; )
3832 if (ev_cb (forks [i]) != embed_fork_cb)
3833 cb (EV_A_ EV_FORK, forks [i]);
3834 #endif
3835
3836 #if EV_ASYNC_ENABLE
3837 if (types & EV_ASYNC)
3838 for (i = asynccnt; i--; )
3839 cb (EV_A_ EV_ASYNC, asyncs [i]);
3840 #endif
3841
3842 #if EV_PREPARE_ENABLE
3843 if (types & EV_PREPARE)
3844 for (i = preparecnt; i--; )
3845 # if EV_EMBED_ENABLE
3846 if (ev_cb (prepares [i]) != embed_prepare_cb)
3847 # endif
3848 cb (EV_A_ EV_PREPARE, prepares [i]);
3849 #endif
3850
3851 #if EV_CHECK_ENABLE
3852 if (types & EV_CHECK)
3853 for (i = checkcnt; i--; )
3854 cb (EV_A_ EV_CHECK, checks [i]);
3855 #endif
3856
3857 #if EV_SIGNAL_ENABLE
3858 if (types & EV_SIGNAL)
3859 for (i = 0; i < EV_NSIG - 1; ++i)
3860 for (wl = signals [i].head; wl; )
3861 {
3862 wn = wl->next;
3863 cb (EV_A_ EV_SIGNAL, wl);
3864 wl = wn;
3865 }
3866 #endif
3867
3868 #if EV_CHILD_ENABLE
3869 if (types & EV_CHILD)
3870 for (i = (EV_PID_HASHSIZE); i--; )
3871 for (wl = childs [i]; wl; )
3872 {
3873 wn = wl->next;
3874 cb (EV_A_ EV_CHILD, wl);
3875 wl = wn;
3876 }
3877 #endif
3878 /* EV_STAT 0x00001000 /* stat data changed */
3879 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
3880 }
3881 #endif
3882
3883 #if EV_MULTIPLICITY
3884 #include "ev_wrap.h"
3885 #endif
3886
3887 EV_CPP(})
3888