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/cvs/libev/ev.c
Revision: 1.365
Committed: Sun Oct 31 22:01:20 2010 UTC (13 years, 8 months ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: rel-4_01, rel-4_02
Changes since 1.364: +3 -5 lines
Log Message:
*** empty log message ***

File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010 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 /*****************************************************************************/
821
822 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
823
824 /* find a suitable new size for the given array, */
825 /* hopefully by rounding to a nice-to-malloc size */
826 inline_size int
827 array_nextsize (int elem, int cur, int cnt)
828 {
829 int ncur = cur + 1;
830
831 do
832 ncur <<= 1;
833 while (cnt > ncur);
834
835 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
836 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
837 {
838 ncur *= elem;
839 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
840 ncur = ncur - sizeof (void *) * 4;
841 ncur /= elem;
842 }
843
844 return ncur;
845 }
846
847 static noinline void *
848 array_realloc (int elem, void *base, int *cur, int cnt)
849 {
850 *cur = array_nextsize (elem, *cur, cnt);
851 return ev_realloc (base, elem * *cur);
852 }
853
854 #define array_init_zero(base,count) \
855 memset ((void *)(base), 0, sizeof (*(base)) * (count))
856
857 #define array_needsize(type,base,cur,cnt,init) \
858 if (expect_false ((cnt) > (cur))) \
859 { \
860 int ocur_ = (cur); \
861 (base) = (type *)array_realloc \
862 (sizeof (type), (base), &(cur), (cnt)); \
863 init ((base) + (ocur_), (cur) - ocur_); \
864 }
865
866 #if 0
867 #define array_slim(type,stem) \
868 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
869 { \
870 stem ## max = array_roundsize (stem ## cnt >> 1); \
871 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
872 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
873 }
874 #endif
875
876 #define array_free(stem, idx) \
877 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
878
879 /*****************************************************************************/
880
881 /* dummy callback for pending events */
882 static void noinline
883 pendingcb (EV_P_ ev_prepare *w, int revents)
884 {
885 }
886
887 void noinline
888 ev_feed_event (EV_P_ void *w, int revents)
889 {
890 W w_ = (W)w;
891 int pri = ABSPRI (w_);
892
893 if (expect_false (w_->pending))
894 pendings [pri][w_->pending - 1].events |= revents;
895 else
896 {
897 w_->pending = ++pendingcnt [pri];
898 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
899 pendings [pri][w_->pending - 1].w = w_;
900 pendings [pri][w_->pending - 1].events = revents;
901 }
902 }
903
904 inline_speed void
905 feed_reverse (EV_P_ W w)
906 {
907 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
908 rfeeds [rfeedcnt++] = w;
909 }
910
911 inline_size void
912 feed_reverse_done (EV_P_ int revents)
913 {
914 do
915 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
916 while (rfeedcnt);
917 }
918
919 inline_speed void
920 queue_events (EV_P_ W *events, int eventcnt, int type)
921 {
922 int i;
923
924 for (i = 0; i < eventcnt; ++i)
925 ev_feed_event (EV_A_ events [i], type);
926 }
927
928 /*****************************************************************************/
929
930 inline_speed void
931 fd_event_nocheck (EV_P_ int fd, int revents)
932 {
933 ANFD *anfd = anfds + fd;
934 ev_io *w;
935
936 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
937 {
938 int ev = w->events & revents;
939
940 if (ev)
941 ev_feed_event (EV_A_ (W)w, ev);
942 }
943 }
944
945 /* do not submit kernel events for fds that have reify set */
946 /* because that means they changed while we were polling for new events */
947 inline_speed void
948 fd_event (EV_P_ int fd, int revents)
949 {
950 ANFD *anfd = anfds + fd;
951
952 if (expect_true (!anfd->reify))
953 fd_event_nocheck (EV_A_ fd, revents);
954 }
955
956 void
957 ev_feed_fd_event (EV_P_ int fd, int revents)
958 {
959 if (fd >= 0 && fd < anfdmax)
960 fd_event_nocheck (EV_A_ fd, revents);
961 }
962
963 /* make sure the external fd watch events are in-sync */
964 /* with the kernel/libev internal state */
965 inline_size void
966 fd_reify (EV_P)
967 {
968 int i;
969
970 for (i = 0; i < fdchangecnt; ++i)
971 {
972 int fd = fdchanges [i];
973 ANFD *anfd = anfds + fd;
974 ev_io *w;
975
976 unsigned char o_events = anfd->events;
977 unsigned char o_reify = anfd->reify;
978
979 anfd->reify = 0;
980
981 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
982 if (o_reify & EV__IOFDSET)
983 {
984 unsigned long arg;
985 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
986 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
987 printf ("oi %d %x\n", fd, anfd->handle);//D
988 }
989 #endif
990
991 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
992 {
993 anfd->events = 0;
994
995 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
996 anfd->events |= (unsigned char)w->events;
997
998 if (o_events != anfd->events)
999 o_reify = EV__IOFDSET; /* actually |= */
1000 }
1001
1002 if (o_reify & EV__IOFDSET)
1003 backend_modify (EV_A_ fd, o_events, anfd->events);
1004 }
1005
1006 fdchangecnt = 0;
1007 }
1008
1009 /* something about the given fd changed */
1010 inline_size void
1011 fd_change (EV_P_ int fd, int flags)
1012 {
1013 unsigned char reify = anfds [fd].reify;
1014 anfds [fd].reify |= flags;
1015
1016 if (expect_true (!reify))
1017 {
1018 ++fdchangecnt;
1019 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1020 fdchanges [fdchangecnt - 1] = fd;
1021 }
1022 }
1023
1024 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1025 inline_speed void
1026 fd_kill (EV_P_ int fd)
1027 {
1028 ev_io *w;
1029
1030 while ((w = (ev_io *)anfds [fd].head))
1031 {
1032 ev_io_stop (EV_A_ w);
1033 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1034 }
1035 }
1036
1037 /* check whether the given fd is actually valid, for error recovery */
1038 inline_size int
1039 fd_valid (int fd)
1040 {
1041 #ifdef _WIN32
1042 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1043 #else
1044 return fcntl (fd, F_GETFD) != -1;
1045 #endif
1046 }
1047
1048 /* called on EBADF to verify fds */
1049 static void noinline
1050 fd_ebadf (EV_P)
1051 {
1052 int fd;
1053
1054 for (fd = 0; fd < anfdmax; ++fd)
1055 if (anfds [fd].events)
1056 if (!fd_valid (fd) && errno == EBADF)
1057 fd_kill (EV_A_ fd);
1058 }
1059
1060 /* called on ENOMEM in select/poll to kill some fds and retry */
1061 static void noinline
1062 fd_enomem (EV_P)
1063 {
1064 int fd;
1065
1066 for (fd = anfdmax; fd--; )
1067 if (anfds [fd].events)
1068 {
1069 fd_kill (EV_A_ fd);
1070 break;
1071 }
1072 }
1073
1074 /* usually called after fork if backend needs to re-arm all fds from scratch */
1075 static void noinline
1076 fd_rearm_all (EV_P)
1077 {
1078 int fd;
1079
1080 for (fd = 0; fd < anfdmax; ++fd)
1081 if (anfds [fd].events)
1082 {
1083 anfds [fd].events = 0;
1084 anfds [fd].emask = 0;
1085 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1086 }
1087 }
1088
1089 /* used to prepare libev internal fd's */
1090 /* this is not fork-safe */
1091 inline_speed void
1092 fd_intern (int fd)
1093 {
1094 #ifdef _WIN32
1095 unsigned long arg = 1;
1096 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1097 #else
1098 fcntl (fd, F_SETFD, FD_CLOEXEC);
1099 fcntl (fd, F_SETFL, O_NONBLOCK);
1100 #endif
1101 }
1102
1103 /*****************************************************************************/
1104
1105 /*
1106 * the heap functions want a real array index. array index 0 is guaranteed to not
1107 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1108 * the branching factor of the d-tree.
1109 */
1110
1111 /*
1112 * at the moment we allow libev the luxury of two heaps,
1113 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1114 * which is more cache-efficient.
1115 * the difference is about 5% with 50000+ watchers.
1116 */
1117 #if EV_USE_4HEAP
1118
1119 #define DHEAP 4
1120 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1121 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1122 #define UPHEAP_DONE(p,k) ((p) == (k))
1123
1124 /* away from the root */
1125 inline_speed void
1126 downheap (ANHE *heap, int N, int k)
1127 {
1128 ANHE he = heap [k];
1129 ANHE *E = heap + N + HEAP0;
1130
1131 for (;;)
1132 {
1133 ev_tstamp minat;
1134 ANHE *minpos;
1135 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1136
1137 /* find minimum child */
1138 if (expect_true (pos + DHEAP - 1 < E))
1139 {
1140 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1141 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1142 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1143 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1144 }
1145 else if (pos < E)
1146 {
1147 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1148 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1149 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1150 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1151 }
1152 else
1153 break;
1154
1155 if (ANHE_at (he) <= minat)
1156 break;
1157
1158 heap [k] = *minpos;
1159 ev_active (ANHE_w (*minpos)) = k;
1160
1161 k = minpos - heap;
1162 }
1163
1164 heap [k] = he;
1165 ev_active (ANHE_w (he)) = k;
1166 }
1167
1168 #else /* 4HEAP */
1169
1170 #define HEAP0 1
1171 #define HPARENT(k) ((k) >> 1)
1172 #define UPHEAP_DONE(p,k) (!(p))
1173
1174 /* away from the root */
1175 inline_speed void
1176 downheap (ANHE *heap, int N, int k)
1177 {
1178 ANHE he = heap [k];
1179
1180 for (;;)
1181 {
1182 int c = k << 1;
1183
1184 if (c >= N + HEAP0)
1185 break;
1186
1187 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1188 ? 1 : 0;
1189
1190 if (ANHE_at (he) <= ANHE_at (heap [c]))
1191 break;
1192
1193 heap [k] = heap [c];
1194 ev_active (ANHE_w (heap [k])) = k;
1195
1196 k = c;
1197 }
1198
1199 heap [k] = he;
1200 ev_active (ANHE_w (he)) = k;
1201 }
1202 #endif
1203
1204 /* towards the root */
1205 inline_speed void
1206 upheap (ANHE *heap, int k)
1207 {
1208 ANHE he = heap [k];
1209
1210 for (;;)
1211 {
1212 int p = HPARENT (k);
1213
1214 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1215 break;
1216
1217 heap [k] = heap [p];
1218 ev_active (ANHE_w (heap [k])) = k;
1219 k = p;
1220 }
1221
1222 heap [k] = he;
1223 ev_active (ANHE_w (he)) = k;
1224 }
1225
1226 /* move an element suitably so it is in a correct place */
1227 inline_size void
1228 adjustheap (ANHE *heap, int N, int k)
1229 {
1230 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1231 upheap (heap, k);
1232 else
1233 downheap (heap, N, k);
1234 }
1235
1236 /* rebuild the heap: this function is used only once and executed rarely */
1237 inline_size void
1238 reheap (ANHE *heap, int N)
1239 {
1240 int i;
1241
1242 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1243 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1244 for (i = 0; i < N; ++i)
1245 upheap (heap, i + HEAP0);
1246 }
1247
1248 /*****************************************************************************/
1249
1250 /* associate signal watchers to a signal signal */
1251 typedef struct
1252 {
1253 EV_ATOMIC_T pending;
1254 #if EV_MULTIPLICITY
1255 EV_P;
1256 #endif
1257 WL head;
1258 } ANSIG;
1259
1260 static ANSIG signals [EV_NSIG - 1];
1261
1262 /*****************************************************************************/
1263
1264 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1265
1266 static void noinline
1267 evpipe_init (EV_P)
1268 {
1269 if (!ev_is_active (&pipe_w))
1270 {
1271 # if EV_USE_EVENTFD
1272 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1273 if (evfd < 0 && errno == EINVAL)
1274 evfd = eventfd (0, 0);
1275
1276 if (evfd >= 0)
1277 {
1278 evpipe [0] = -1;
1279 fd_intern (evfd); /* doing it twice doesn't hurt */
1280 ev_io_set (&pipe_w, evfd, EV_READ);
1281 }
1282 else
1283 # endif
1284 {
1285 while (pipe (evpipe))
1286 ev_syserr ("(libev) error creating signal/async pipe");
1287
1288 fd_intern (evpipe [0]);
1289 fd_intern (evpipe [1]);
1290 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1291 }
1292
1293 ev_io_start (EV_A_ &pipe_w);
1294 ev_unref (EV_A); /* watcher should not keep loop alive */
1295 }
1296 }
1297
1298 inline_size void
1299 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1300 {
1301 if (!*flag)
1302 {
1303 int old_errno = errno; /* save errno because write might clobber it */
1304 char dummy;
1305
1306 *flag = 1;
1307
1308 #if EV_USE_EVENTFD
1309 if (evfd >= 0)
1310 {
1311 uint64_t counter = 1;
1312 write (evfd, &counter, sizeof (uint64_t));
1313 }
1314 else
1315 #endif
1316 /* win32 people keep sending patches that change this write() to send() */
1317 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1318 /* so when you think this write should be a send instead, please find out */
1319 /* where your send() is from - it's definitely not the microsoft send, and */
1320 /* tell me. thank you. */
1321 write (evpipe [1], &dummy, 1);
1322
1323 errno = old_errno;
1324 }
1325 }
1326
1327 /* called whenever the libev signal pipe */
1328 /* got some events (signal, async) */
1329 static void
1330 pipecb (EV_P_ ev_io *iow, int revents)
1331 {
1332 int i;
1333
1334 #if EV_USE_EVENTFD
1335 if (evfd >= 0)
1336 {
1337 uint64_t counter;
1338 read (evfd, &counter, sizeof (uint64_t));
1339 }
1340 else
1341 #endif
1342 {
1343 char dummy;
1344 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1345 read (evpipe [0], &dummy, 1);
1346 }
1347
1348 if (sig_pending)
1349 {
1350 sig_pending = 0;
1351
1352 for (i = EV_NSIG - 1; i--; )
1353 if (expect_false (signals [i].pending))
1354 ev_feed_signal_event (EV_A_ i + 1);
1355 }
1356
1357 #if EV_ASYNC_ENABLE
1358 if (async_pending)
1359 {
1360 async_pending = 0;
1361
1362 for (i = asynccnt; i--; )
1363 if (asyncs [i]->sent)
1364 {
1365 asyncs [i]->sent = 0;
1366 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1367 }
1368 }
1369 #endif
1370 }
1371
1372 /*****************************************************************************/
1373
1374 static void
1375 ev_sighandler (int signum)
1376 {
1377 #if EV_MULTIPLICITY
1378 EV_P = signals [signum - 1].loop;
1379 #endif
1380
1381 #ifdef _WIN32
1382 signal (signum, ev_sighandler);
1383 #endif
1384
1385 signals [signum - 1].pending = 1;
1386 evpipe_write (EV_A_ &sig_pending);
1387 }
1388
1389 void noinline
1390 ev_feed_signal_event (EV_P_ int signum)
1391 {
1392 WL w;
1393
1394 if (expect_false (signum <= 0 || signum > EV_NSIG))
1395 return;
1396
1397 --signum;
1398
1399 #if EV_MULTIPLICITY
1400 /* it is permissible to try to feed a signal to the wrong loop */
1401 /* or, likely more useful, feeding a signal nobody is waiting for */
1402
1403 if (expect_false (signals [signum].loop != EV_A))
1404 return;
1405 #endif
1406
1407 signals [signum].pending = 0;
1408
1409 for (w = signals [signum].head; w; w = w->next)
1410 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1411 }
1412
1413 #if EV_USE_SIGNALFD
1414 static void
1415 sigfdcb (EV_P_ ev_io *iow, int revents)
1416 {
1417 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1418
1419 for (;;)
1420 {
1421 ssize_t res = read (sigfd, si, sizeof (si));
1422
1423 /* not ISO-C, as res might be -1, but works with SuS */
1424 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1425 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1426
1427 if (res < (ssize_t)sizeof (si))
1428 break;
1429 }
1430 }
1431 #endif
1432
1433 #endif
1434
1435 /*****************************************************************************/
1436
1437 #if EV_CHILD_ENABLE
1438 static WL childs [EV_PID_HASHSIZE];
1439
1440 static ev_signal childev;
1441
1442 #ifndef WIFCONTINUED
1443 # define WIFCONTINUED(status) 0
1444 #endif
1445
1446 /* handle a single child status event */
1447 inline_speed void
1448 child_reap (EV_P_ int chain, int pid, int status)
1449 {
1450 ev_child *w;
1451 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1452
1453 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1454 {
1455 if ((w->pid == pid || !w->pid)
1456 && (!traced || (w->flags & 1)))
1457 {
1458 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1459 w->rpid = pid;
1460 w->rstatus = status;
1461 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1462 }
1463 }
1464 }
1465
1466 #ifndef WCONTINUED
1467 # define WCONTINUED 0
1468 #endif
1469
1470 /* called on sigchld etc., calls waitpid */
1471 static void
1472 childcb (EV_P_ ev_signal *sw, int revents)
1473 {
1474 int pid, status;
1475
1476 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1477 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1478 if (!WCONTINUED
1479 || errno != EINVAL
1480 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1481 return;
1482
1483 /* make sure we are called again until all children have been reaped */
1484 /* we need to do it this way so that the callback gets called before we continue */
1485 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1486
1487 child_reap (EV_A_ pid, pid, status);
1488 if ((EV_PID_HASHSIZE) > 1)
1489 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1490 }
1491
1492 #endif
1493
1494 /*****************************************************************************/
1495
1496 #if EV_USE_IOCP
1497 # include "ev_iocp.c"
1498 #endif
1499 #if EV_USE_PORT
1500 # include "ev_port.c"
1501 #endif
1502 #if EV_USE_KQUEUE
1503 # include "ev_kqueue.c"
1504 #endif
1505 #if EV_USE_EPOLL
1506 # include "ev_epoll.c"
1507 #endif
1508 #if EV_USE_POLL
1509 # include "ev_poll.c"
1510 #endif
1511 #if EV_USE_SELECT
1512 # include "ev_select.c"
1513 #endif
1514
1515 int
1516 ev_version_major (void)
1517 {
1518 return EV_VERSION_MAJOR;
1519 }
1520
1521 int
1522 ev_version_minor (void)
1523 {
1524 return EV_VERSION_MINOR;
1525 }
1526
1527 /* return true if we are running with elevated privileges and should ignore env variables */
1528 int inline_size
1529 enable_secure (void)
1530 {
1531 #ifdef _WIN32
1532 return 0;
1533 #else
1534 return getuid () != geteuid ()
1535 || getgid () != getegid ();
1536 #endif
1537 }
1538
1539 unsigned int
1540 ev_supported_backends (void)
1541 {
1542 unsigned int flags = 0;
1543
1544 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1545 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1546 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1547 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1548 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1549
1550 return flags;
1551 }
1552
1553 unsigned int
1554 ev_recommended_backends (void)
1555 {
1556 unsigned int flags = ev_supported_backends ();
1557
1558 #ifndef __NetBSD__
1559 /* kqueue is borked on everything but netbsd apparently */
1560 /* it usually doesn't work correctly on anything but sockets and pipes */
1561 flags &= ~EVBACKEND_KQUEUE;
1562 #endif
1563 #ifdef __APPLE__
1564 /* only select works correctly on that "unix-certified" platform */
1565 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1566 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1567 #endif
1568 #ifdef __FreeBSD__
1569 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1570 #endif
1571
1572 return flags;
1573 }
1574
1575 unsigned int
1576 ev_embeddable_backends (void)
1577 {
1578 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1579
1580 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1581 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1582 flags &= ~EVBACKEND_EPOLL;
1583
1584 return flags;
1585 }
1586
1587 unsigned int
1588 ev_backend (EV_P)
1589 {
1590 return backend;
1591 }
1592
1593 #if EV_FEATURE_API
1594 unsigned int
1595 ev_iteration (EV_P)
1596 {
1597 return loop_count;
1598 }
1599
1600 unsigned int
1601 ev_depth (EV_P)
1602 {
1603 return loop_depth;
1604 }
1605
1606 void
1607 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1608 {
1609 io_blocktime = interval;
1610 }
1611
1612 void
1613 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1614 {
1615 timeout_blocktime = interval;
1616 }
1617
1618 void
1619 ev_set_userdata (EV_P_ void *data)
1620 {
1621 userdata = data;
1622 }
1623
1624 void *
1625 ev_userdata (EV_P)
1626 {
1627 return userdata;
1628 }
1629
1630 void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1631 {
1632 invoke_cb = invoke_pending_cb;
1633 }
1634
1635 void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1636 {
1637 release_cb = release;
1638 acquire_cb = acquire;
1639 }
1640 #endif
1641
1642 /* initialise a loop structure, must be zero-initialised */
1643 static void noinline
1644 loop_init (EV_P_ unsigned int flags)
1645 {
1646 if (!backend)
1647 {
1648 #if EV_USE_REALTIME
1649 if (!have_realtime)
1650 {
1651 struct timespec ts;
1652
1653 if (!clock_gettime (CLOCK_REALTIME, &ts))
1654 have_realtime = 1;
1655 }
1656 #endif
1657
1658 #if EV_USE_MONOTONIC
1659 if (!have_monotonic)
1660 {
1661 struct timespec ts;
1662
1663 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1664 have_monotonic = 1;
1665 }
1666 #endif
1667
1668 /* pid check not overridable via env */
1669 #ifndef _WIN32
1670 if (flags & EVFLAG_FORKCHECK)
1671 curpid = getpid ();
1672 #endif
1673
1674 if (!(flags & EVFLAG_NOENV)
1675 && !enable_secure ()
1676 && getenv ("LIBEV_FLAGS"))
1677 flags = atoi (getenv ("LIBEV_FLAGS"));
1678
1679 ev_rt_now = ev_time ();
1680 mn_now = get_clock ();
1681 now_floor = mn_now;
1682 rtmn_diff = ev_rt_now - mn_now;
1683 #if EV_FEATURE_API
1684 invoke_cb = ev_invoke_pending;
1685 #endif
1686
1687 io_blocktime = 0.;
1688 timeout_blocktime = 0.;
1689 backend = 0;
1690 backend_fd = -1;
1691 sig_pending = 0;
1692 #if EV_ASYNC_ENABLE
1693 async_pending = 0;
1694 #endif
1695 #if EV_USE_INOTIFY
1696 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1697 #endif
1698 #if EV_USE_SIGNALFD
1699 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1700 #endif
1701
1702 if (!(flags & 0x0000ffffU))
1703 flags |= ev_recommended_backends ();
1704
1705 #if EV_USE_IOCP
1706 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1707 #endif
1708 #if EV_USE_PORT
1709 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1710 #endif
1711 #if EV_USE_KQUEUE
1712 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1713 #endif
1714 #if EV_USE_EPOLL
1715 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1716 #endif
1717 #if EV_USE_POLL
1718 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1719 #endif
1720 #if EV_USE_SELECT
1721 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1722 #endif
1723
1724 ev_prepare_init (&pending_w, pendingcb);
1725
1726 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1727 ev_init (&pipe_w, pipecb);
1728 ev_set_priority (&pipe_w, EV_MAXPRI);
1729 #endif
1730 }
1731 }
1732
1733 /* free up a loop structure */
1734 void
1735 ev_loop_destroy (EV_P)
1736 {
1737 int i;
1738
1739 #if EV_MULTIPLICITY
1740 /* mimic free (0) */
1741 if (!EV_A)
1742 return;
1743 #endif
1744
1745 #if EV_CLEANUP_ENABLE
1746 /* queue cleanup watchers (and execute them) */
1747 if (expect_false (cleanupcnt))
1748 {
1749 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1750 EV_INVOKE_PENDING;
1751 }
1752 #endif
1753
1754 #if EV_CHILD_ENABLE
1755 if (ev_is_active (&childev))
1756 {
1757 ev_ref (EV_A); /* child watcher */
1758 ev_signal_stop (EV_A_ &childev);
1759 }
1760 #endif
1761
1762 if (ev_is_active (&pipe_w))
1763 {
1764 /*ev_ref (EV_A);*/
1765 /*ev_io_stop (EV_A_ &pipe_w);*/
1766
1767 #if EV_USE_EVENTFD
1768 if (evfd >= 0)
1769 close (evfd);
1770 #endif
1771
1772 if (evpipe [0] >= 0)
1773 {
1774 EV_WIN32_CLOSE_FD (evpipe [0]);
1775 EV_WIN32_CLOSE_FD (evpipe [1]);
1776 }
1777 }
1778
1779 #if EV_USE_SIGNALFD
1780 if (ev_is_active (&sigfd_w))
1781 close (sigfd);
1782 #endif
1783
1784 #if EV_USE_INOTIFY
1785 if (fs_fd >= 0)
1786 close (fs_fd);
1787 #endif
1788
1789 if (backend_fd >= 0)
1790 close (backend_fd);
1791
1792 #if EV_USE_IOCP
1793 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1794 #endif
1795 #if EV_USE_PORT
1796 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1797 #endif
1798 #if EV_USE_KQUEUE
1799 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1800 #endif
1801 #if EV_USE_EPOLL
1802 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1803 #endif
1804 #if EV_USE_POLL
1805 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1806 #endif
1807 #if EV_USE_SELECT
1808 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1809 #endif
1810
1811 for (i = NUMPRI; i--; )
1812 {
1813 array_free (pending, [i]);
1814 #if EV_IDLE_ENABLE
1815 array_free (idle, [i]);
1816 #endif
1817 }
1818
1819 ev_free (anfds); anfds = 0; anfdmax = 0;
1820
1821 /* have to use the microsoft-never-gets-it-right macro */
1822 array_free (rfeed, EMPTY);
1823 array_free (fdchange, EMPTY);
1824 array_free (timer, EMPTY);
1825 #if EV_PERIODIC_ENABLE
1826 array_free (periodic, EMPTY);
1827 #endif
1828 #if EV_FORK_ENABLE
1829 array_free (fork, EMPTY);
1830 #endif
1831 #if EV_CLEANUP_ENABLE
1832 array_free (cleanup, EMPTY);
1833 #endif
1834 array_free (prepare, EMPTY);
1835 array_free (check, EMPTY);
1836 #if EV_ASYNC_ENABLE
1837 array_free (async, EMPTY);
1838 #endif
1839
1840 backend = 0;
1841
1842 #if EV_MULTIPLICITY
1843 if (ev_is_default_loop (EV_A))
1844 #endif
1845 ev_default_loop_ptr = 0;
1846 #if EV_MULTIPLICITY
1847 else
1848 ev_free (EV_A);
1849 #endif
1850 }
1851
1852 #if EV_USE_INOTIFY
1853 inline_size void infy_fork (EV_P);
1854 #endif
1855
1856 inline_size void
1857 loop_fork (EV_P)
1858 {
1859 #if EV_USE_PORT
1860 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1861 #endif
1862 #if EV_USE_KQUEUE
1863 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1864 #endif
1865 #if EV_USE_EPOLL
1866 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1867 #endif
1868 #if EV_USE_INOTIFY
1869 infy_fork (EV_A);
1870 #endif
1871
1872 if (ev_is_active (&pipe_w))
1873 {
1874 /* this "locks" the handlers against writing to the pipe */
1875 /* while we modify the fd vars */
1876 sig_pending = 1;
1877 #if EV_ASYNC_ENABLE
1878 async_pending = 1;
1879 #endif
1880
1881 ev_ref (EV_A);
1882 ev_io_stop (EV_A_ &pipe_w);
1883
1884 #if EV_USE_EVENTFD
1885 if (evfd >= 0)
1886 close (evfd);
1887 #endif
1888
1889 if (evpipe [0] >= 0)
1890 {
1891 EV_WIN32_CLOSE_FD (evpipe [0]);
1892 EV_WIN32_CLOSE_FD (evpipe [1]);
1893 }
1894
1895 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1896 evpipe_init (EV_A);
1897 /* now iterate over everything, in case we missed something */
1898 pipecb (EV_A_ &pipe_w, EV_READ);
1899 #endif
1900 }
1901
1902 postfork = 0;
1903 }
1904
1905 #if EV_MULTIPLICITY
1906
1907 struct ev_loop *
1908 ev_loop_new (unsigned int flags)
1909 {
1910 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1911
1912 memset (EV_A, 0, sizeof (struct ev_loop));
1913 loop_init (EV_A_ flags);
1914
1915 if (ev_backend (EV_A))
1916 return EV_A;
1917
1918 ev_free (EV_A);
1919 return 0;
1920 }
1921
1922 #endif /* multiplicity */
1923
1924 #if EV_VERIFY
1925 static void noinline
1926 verify_watcher (EV_P_ W w)
1927 {
1928 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1929
1930 if (w->pending)
1931 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1932 }
1933
1934 static void noinline
1935 verify_heap (EV_P_ ANHE *heap, int N)
1936 {
1937 int i;
1938
1939 for (i = HEAP0; i < N + HEAP0; ++i)
1940 {
1941 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1942 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1943 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1944
1945 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1946 }
1947 }
1948
1949 static void noinline
1950 array_verify (EV_P_ W *ws, int cnt)
1951 {
1952 while (cnt--)
1953 {
1954 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1955 verify_watcher (EV_A_ ws [cnt]);
1956 }
1957 }
1958 #endif
1959
1960 #if EV_FEATURE_API
1961 void
1962 ev_verify (EV_P)
1963 {
1964 #if EV_VERIFY
1965 int i;
1966 WL w;
1967
1968 assert (activecnt >= -1);
1969
1970 assert (fdchangemax >= fdchangecnt);
1971 for (i = 0; i < fdchangecnt; ++i)
1972 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1973
1974 assert (anfdmax >= 0);
1975 for (i = 0; i < anfdmax; ++i)
1976 for (w = anfds [i].head; w; w = w->next)
1977 {
1978 verify_watcher (EV_A_ (W)w);
1979 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
1980 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1981 }
1982
1983 assert (timermax >= timercnt);
1984 verify_heap (EV_A_ timers, timercnt);
1985
1986 #if EV_PERIODIC_ENABLE
1987 assert (periodicmax >= periodiccnt);
1988 verify_heap (EV_A_ periodics, periodiccnt);
1989 #endif
1990
1991 for (i = NUMPRI; i--; )
1992 {
1993 assert (pendingmax [i] >= pendingcnt [i]);
1994 #if EV_IDLE_ENABLE
1995 assert (idleall >= 0);
1996 assert (idlemax [i] >= idlecnt [i]);
1997 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1998 #endif
1999 }
2000
2001 #if EV_FORK_ENABLE
2002 assert (forkmax >= forkcnt);
2003 array_verify (EV_A_ (W *)forks, forkcnt);
2004 #endif
2005
2006 #if EV_CLEANUP_ENABLE
2007 assert (cleanupmax >= cleanupcnt);
2008 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2009 #endif
2010
2011 #if EV_ASYNC_ENABLE
2012 assert (asyncmax >= asynccnt);
2013 array_verify (EV_A_ (W *)asyncs, asynccnt);
2014 #endif
2015
2016 #if EV_PREPARE_ENABLE
2017 assert (preparemax >= preparecnt);
2018 array_verify (EV_A_ (W *)prepares, preparecnt);
2019 #endif
2020
2021 #if EV_CHECK_ENABLE
2022 assert (checkmax >= checkcnt);
2023 array_verify (EV_A_ (W *)checks, checkcnt);
2024 #endif
2025
2026 # if 0
2027 #if EV_CHILD_ENABLE
2028 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2029 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2030 #endif
2031 # endif
2032 #endif
2033 }
2034 #endif
2035
2036 #if EV_MULTIPLICITY
2037 struct ev_loop *
2038 #else
2039 int
2040 #endif
2041 ev_default_loop (unsigned int flags)
2042 {
2043 if (!ev_default_loop_ptr)
2044 {
2045 #if EV_MULTIPLICITY
2046 EV_P = ev_default_loop_ptr = &default_loop_struct;
2047 #else
2048 ev_default_loop_ptr = 1;
2049 #endif
2050
2051 loop_init (EV_A_ flags);
2052
2053 if (ev_backend (EV_A))
2054 {
2055 #if EV_CHILD_ENABLE
2056 ev_signal_init (&childev, childcb, SIGCHLD);
2057 ev_set_priority (&childev, EV_MAXPRI);
2058 ev_signal_start (EV_A_ &childev);
2059 ev_unref (EV_A); /* child watcher should not keep loop alive */
2060 #endif
2061 }
2062 else
2063 ev_default_loop_ptr = 0;
2064 }
2065
2066 return ev_default_loop_ptr;
2067 }
2068
2069 void
2070 ev_loop_fork (EV_P)
2071 {
2072 postfork = 1; /* must be in line with ev_default_fork */
2073 }
2074
2075 /*****************************************************************************/
2076
2077 void
2078 ev_invoke (EV_P_ void *w, int revents)
2079 {
2080 EV_CB_INVOKE ((W)w, revents);
2081 }
2082
2083 unsigned int
2084 ev_pending_count (EV_P)
2085 {
2086 int pri;
2087 unsigned int count = 0;
2088
2089 for (pri = NUMPRI; pri--; )
2090 count += pendingcnt [pri];
2091
2092 return count;
2093 }
2094
2095 void noinline
2096 ev_invoke_pending (EV_P)
2097 {
2098 int pri;
2099
2100 for (pri = NUMPRI; pri--; )
2101 while (pendingcnt [pri])
2102 {
2103 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2104
2105 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
2106 /* ^ this is no longer true, as pending_w could be here */
2107
2108 p->w->pending = 0;
2109 EV_CB_INVOKE (p->w, p->events);
2110 EV_FREQUENT_CHECK;
2111 }
2112 }
2113
2114 #if EV_IDLE_ENABLE
2115 /* make idle watchers pending. this handles the "call-idle */
2116 /* only when higher priorities are idle" logic */
2117 inline_size void
2118 idle_reify (EV_P)
2119 {
2120 if (expect_false (idleall))
2121 {
2122 int pri;
2123
2124 for (pri = NUMPRI; pri--; )
2125 {
2126 if (pendingcnt [pri])
2127 break;
2128
2129 if (idlecnt [pri])
2130 {
2131 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2132 break;
2133 }
2134 }
2135 }
2136 }
2137 #endif
2138
2139 /* make timers pending */
2140 inline_size void
2141 timers_reify (EV_P)
2142 {
2143 EV_FREQUENT_CHECK;
2144
2145 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2146 {
2147 do
2148 {
2149 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2150
2151 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2152
2153 /* first reschedule or stop timer */
2154 if (w->repeat)
2155 {
2156 ev_at (w) += w->repeat;
2157 if (ev_at (w) < mn_now)
2158 ev_at (w) = mn_now;
2159
2160 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2161
2162 ANHE_at_cache (timers [HEAP0]);
2163 downheap (timers, timercnt, HEAP0);
2164 }
2165 else
2166 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2167
2168 EV_FREQUENT_CHECK;
2169 feed_reverse (EV_A_ (W)w);
2170 }
2171 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2172
2173 feed_reverse_done (EV_A_ EV_TIMER);
2174 }
2175 }
2176
2177 #if EV_PERIODIC_ENABLE
2178 /* make periodics pending */
2179 inline_size void
2180 periodics_reify (EV_P)
2181 {
2182 EV_FREQUENT_CHECK;
2183
2184 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2185 {
2186 int feed_count = 0;
2187
2188 do
2189 {
2190 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2191
2192 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2193
2194 /* first reschedule or stop timer */
2195 if (w->reschedule_cb)
2196 {
2197 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2198
2199 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2200
2201 ANHE_at_cache (periodics [HEAP0]);
2202 downheap (periodics, periodiccnt, HEAP0);
2203 }
2204 else if (w->interval)
2205 {
2206 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2207 /* if next trigger time is not sufficiently in the future, put it there */
2208 /* this might happen because of floating point inexactness */
2209 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2210 {
2211 ev_at (w) += w->interval;
2212
2213 /* if interval is unreasonably low we might still have a time in the past */
2214 /* so correct this. this will make the periodic very inexact, but the user */
2215 /* has effectively asked to get triggered more often than possible */
2216 if (ev_at (w) < ev_rt_now)
2217 ev_at (w) = ev_rt_now;
2218 }
2219
2220 ANHE_at_cache (periodics [HEAP0]);
2221 downheap (periodics, periodiccnt, HEAP0);
2222 }
2223 else
2224 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2225
2226 EV_FREQUENT_CHECK;
2227 feed_reverse (EV_A_ (W)w);
2228 }
2229 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2230
2231 feed_reverse_done (EV_A_ EV_PERIODIC);
2232 }
2233 }
2234
2235 /* simply recalculate all periodics */
2236 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2237 static void noinline
2238 periodics_reschedule (EV_P)
2239 {
2240 int i;
2241
2242 /* adjust periodics after time jump */
2243 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2244 {
2245 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2246
2247 if (w->reschedule_cb)
2248 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2249 else if (w->interval)
2250 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2251
2252 ANHE_at_cache (periodics [i]);
2253 }
2254
2255 reheap (periodics, periodiccnt);
2256 }
2257 #endif
2258
2259 /* adjust all timers by a given offset */
2260 static void noinline
2261 timers_reschedule (EV_P_ ev_tstamp adjust)
2262 {
2263 int i;
2264
2265 for (i = 0; i < timercnt; ++i)
2266 {
2267 ANHE *he = timers + i + HEAP0;
2268 ANHE_w (*he)->at += adjust;
2269 ANHE_at_cache (*he);
2270 }
2271 }
2272
2273 /* fetch new monotonic and realtime times from the kernel */
2274 /* also detect if there was a timejump, and act accordingly */
2275 inline_speed void
2276 time_update (EV_P_ ev_tstamp max_block)
2277 {
2278 #if EV_USE_MONOTONIC
2279 if (expect_true (have_monotonic))
2280 {
2281 int i;
2282 ev_tstamp odiff = rtmn_diff;
2283
2284 mn_now = get_clock ();
2285
2286 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2287 /* interpolate in the meantime */
2288 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2289 {
2290 ev_rt_now = rtmn_diff + mn_now;
2291 return;
2292 }
2293
2294 now_floor = mn_now;
2295 ev_rt_now = ev_time ();
2296
2297 /* loop a few times, before making important decisions.
2298 * on the choice of "4": one iteration isn't enough,
2299 * in case we get preempted during the calls to
2300 * ev_time and get_clock. a second call is almost guaranteed
2301 * to succeed in that case, though. and looping a few more times
2302 * doesn't hurt either as we only do this on time-jumps or
2303 * in the unlikely event of having been preempted here.
2304 */
2305 for (i = 4; --i; )
2306 {
2307 rtmn_diff = ev_rt_now - mn_now;
2308
2309 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2310 return; /* all is well */
2311
2312 ev_rt_now = ev_time ();
2313 mn_now = get_clock ();
2314 now_floor = mn_now;
2315 }
2316
2317 /* no timer adjustment, as the monotonic clock doesn't jump */
2318 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2319 # if EV_PERIODIC_ENABLE
2320 periodics_reschedule (EV_A);
2321 # endif
2322 }
2323 else
2324 #endif
2325 {
2326 ev_rt_now = ev_time ();
2327
2328 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2329 {
2330 /* adjust timers. this is easy, as the offset is the same for all of them */
2331 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2332 #if EV_PERIODIC_ENABLE
2333 periodics_reschedule (EV_A);
2334 #endif
2335 }
2336
2337 mn_now = ev_rt_now;
2338 }
2339 }
2340
2341 void
2342 ev_run (EV_P_ int flags)
2343 {
2344 #if EV_FEATURE_API
2345 ++loop_depth;
2346 #endif
2347
2348 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2349
2350 loop_done = EVBREAK_CANCEL;
2351
2352 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2353
2354 do
2355 {
2356 #if EV_VERIFY >= 2
2357 ev_verify (EV_A);
2358 #endif
2359
2360 #ifndef _WIN32
2361 if (expect_false (curpid)) /* penalise the forking check even more */
2362 if (expect_false (getpid () != curpid))
2363 {
2364 curpid = getpid ();
2365 postfork = 1;
2366 }
2367 #endif
2368
2369 #if EV_FORK_ENABLE
2370 /* we might have forked, so queue fork handlers */
2371 if (expect_false (postfork))
2372 if (forkcnt)
2373 {
2374 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2375 EV_INVOKE_PENDING;
2376 }
2377 #endif
2378
2379 #if EV_PREPARE_ENABLE
2380 /* queue prepare watchers (and execute them) */
2381 if (expect_false (preparecnt))
2382 {
2383 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2384 EV_INVOKE_PENDING;
2385 }
2386 #endif
2387
2388 if (expect_false (loop_done))
2389 break;
2390
2391 /* we might have forked, so reify kernel state if necessary */
2392 if (expect_false (postfork))
2393 loop_fork (EV_A);
2394
2395 /* update fd-related kernel structures */
2396 fd_reify (EV_A);
2397
2398 /* calculate blocking time */
2399 {
2400 ev_tstamp waittime = 0.;
2401 ev_tstamp sleeptime = 0.;
2402
2403 /* remember old timestamp for io_blocktime calculation */
2404 ev_tstamp prev_mn_now = mn_now;
2405
2406 /* update time to cancel out callback processing overhead */
2407 time_update (EV_A_ 1e100);
2408
2409 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt)))
2410 {
2411 waittime = MAX_BLOCKTIME;
2412
2413 if (timercnt)
2414 {
2415 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2416 if (waittime > to) waittime = to;
2417 }
2418
2419 #if EV_PERIODIC_ENABLE
2420 if (periodiccnt)
2421 {
2422 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2423 if (waittime > to) waittime = to;
2424 }
2425 #endif
2426
2427 /* don't let timeouts decrease the waittime below timeout_blocktime */
2428 if (expect_false (waittime < timeout_blocktime))
2429 waittime = timeout_blocktime;
2430
2431 /* extra check because io_blocktime is commonly 0 */
2432 if (expect_false (io_blocktime))
2433 {
2434 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2435
2436 if (sleeptime > waittime - backend_fudge)
2437 sleeptime = waittime - backend_fudge;
2438
2439 if (expect_true (sleeptime > 0.))
2440 {
2441 ev_sleep (sleeptime);
2442 waittime -= sleeptime;
2443 }
2444 }
2445 }
2446
2447 #if EV_FEATURE_API
2448 ++loop_count;
2449 #endif
2450 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2451 backend_poll (EV_A_ waittime);
2452 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2453
2454 /* update ev_rt_now, do magic */
2455 time_update (EV_A_ waittime + sleeptime);
2456 }
2457
2458 /* queue pending timers and reschedule them */
2459 timers_reify (EV_A); /* relative timers called last */
2460 #if EV_PERIODIC_ENABLE
2461 periodics_reify (EV_A); /* absolute timers called first */
2462 #endif
2463
2464 #if EV_IDLE_ENABLE
2465 /* queue idle watchers unless other events are pending */
2466 idle_reify (EV_A);
2467 #endif
2468
2469 #if EV_CHECK_ENABLE
2470 /* queue check watchers, to be executed first */
2471 if (expect_false (checkcnt))
2472 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2473 #endif
2474
2475 EV_INVOKE_PENDING;
2476 }
2477 while (expect_true (
2478 activecnt
2479 && !loop_done
2480 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2481 ));
2482
2483 if (loop_done == EVBREAK_ONE)
2484 loop_done = EVBREAK_CANCEL;
2485
2486 #if EV_FEATURE_API
2487 --loop_depth;
2488 #endif
2489 }
2490
2491 void
2492 ev_break (EV_P_ int how)
2493 {
2494 loop_done = how;
2495 }
2496
2497 void
2498 ev_ref (EV_P)
2499 {
2500 ++activecnt;
2501 }
2502
2503 void
2504 ev_unref (EV_P)
2505 {
2506 --activecnt;
2507 }
2508
2509 void
2510 ev_now_update (EV_P)
2511 {
2512 time_update (EV_A_ 1e100);
2513 }
2514
2515 void
2516 ev_suspend (EV_P)
2517 {
2518 ev_now_update (EV_A);
2519 }
2520
2521 void
2522 ev_resume (EV_P)
2523 {
2524 ev_tstamp mn_prev = mn_now;
2525
2526 ev_now_update (EV_A);
2527 timers_reschedule (EV_A_ mn_now - mn_prev);
2528 #if EV_PERIODIC_ENABLE
2529 /* TODO: really do this? */
2530 periodics_reschedule (EV_A);
2531 #endif
2532 }
2533
2534 /*****************************************************************************/
2535 /* singly-linked list management, used when the expected list length is short */
2536
2537 inline_size void
2538 wlist_add (WL *head, WL elem)
2539 {
2540 elem->next = *head;
2541 *head = elem;
2542 }
2543
2544 inline_size void
2545 wlist_del (WL *head, WL elem)
2546 {
2547 while (*head)
2548 {
2549 if (expect_true (*head == elem))
2550 {
2551 *head = elem->next;
2552 break;
2553 }
2554
2555 head = &(*head)->next;
2556 }
2557 }
2558
2559 /* internal, faster, version of ev_clear_pending */
2560 inline_speed void
2561 clear_pending (EV_P_ W w)
2562 {
2563 if (w->pending)
2564 {
2565 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2566 w->pending = 0;
2567 }
2568 }
2569
2570 int
2571 ev_clear_pending (EV_P_ void *w)
2572 {
2573 W w_ = (W)w;
2574 int pending = w_->pending;
2575
2576 if (expect_true (pending))
2577 {
2578 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2579 p->w = (W)&pending_w;
2580 w_->pending = 0;
2581 return p->events;
2582 }
2583 else
2584 return 0;
2585 }
2586
2587 inline_size void
2588 pri_adjust (EV_P_ W w)
2589 {
2590 int pri = ev_priority (w);
2591 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2592 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2593 ev_set_priority (w, pri);
2594 }
2595
2596 inline_speed void
2597 ev_start (EV_P_ W w, int active)
2598 {
2599 pri_adjust (EV_A_ w);
2600 w->active = active;
2601 ev_ref (EV_A);
2602 }
2603
2604 inline_size void
2605 ev_stop (EV_P_ W w)
2606 {
2607 ev_unref (EV_A);
2608 w->active = 0;
2609 }
2610
2611 /*****************************************************************************/
2612
2613 void noinline
2614 ev_io_start (EV_P_ ev_io *w)
2615 {
2616 int fd = w->fd;
2617
2618 if (expect_false (ev_is_active (w)))
2619 return;
2620
2621 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2622 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2623
2624 EV_FREQUENT_CHECK;
2625
2626 ev_start (EV_A_ (W)w, 1);
2627 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2628 wlist_add (&anfds[fd].head, (WL)w);
2629
2630 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2631 w->events &= ~EV__IOFDSET;
2632
2633 EV_FREQUENT_CHECK;
2634 }
2635
2636 void noinline
2637 ev_io_stop (EV_P_ ev_io *w)
2638 {
2639 clear_pending (EV_A_ (W)w);
2640 if (expect_false (!ev_is_active (w)))
2641 return;
2642
2643 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2644
2645 EV_FREQUENT_CHECK;
2646
2647 wlist_del (&anfds[w->fd].head, (WL)w);
2648 ev_stop (EV_A_ (W)w);
2649
2650 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2651
2652 EV_FREQUENT_CHECK;
2653 }
2654
2655 void noinline
2656 ev_timer_start (EV_P_ ev_timer *w)
2657 {
2658 if (expect_false (ev_is_active (w)))
2659 return;
2660
2661 ev_at (w) += mn_now;
2662
2663 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2664
2665 EV_FREQUENT_CHECK;
2666
2667 ++timercnt;
2668 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2669 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2670 ANHE_w (timers [ev_active (w)]) = (WT)w;
2671 ANHE_at_cache (timers [ev_active (w)]);
2672 upheap (timers, ev_active (w));
2673
2674 EV_FREQUENT_CHECK;
2675
2676 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2677 }
2678
2679 void noinline
2680 ev_timer_stop (EV_P_ ev_timer *w)
2681 {
2682 clear_pending (EV_A_ (W)w);
2683 if (expect_false (!ev_is_active (w)))
2684 return;
2685
2686 EV_FREQUENT_CHECK;
2687
2688 {
2689 int active = ev_active (w);
2690
2691 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2692
2693 --timercnt;
2694
2695 if (expect_true (active < timercnt + HEAP0))
2696 {
2697 timers [active] = timers [timercnt + HEAP0];
2698 adjustheap (timers, timercnt, active);
2699 }
2700 }
2701
2702 ev_at (w) -= mn_now;
2703
2704 ev_stop (EV_A_ (W)w);
2705
2706 EV_FREQUENT_CHECK;
2707 }
2708
2709 void noinline
2710 ev_timer_again (EV_P_ ev_timer *w)
2711 {
2712 EV_FREQUENT_CHECK;
2713
2714 if (ev_is_active (w))
2715 {
2716 if (w->repeat)
2717 {
2718 ev_at (w) = mn_now + w->repeat;
2719 ANHE_at_cache (timers [ev_active (w)]);
2720 adjustheap (timers, timercnt, ev_active (w));
2721 }
2722 else
2723 ev_timer_stop (EV_A_ w);
2724 }
2725 else if (w->repeat)
2726 {
2727 ev_at (w) = w->repeat;
2728 ev_timer_start (EV_A_ w);
2729 }
2730
2731 EV_FREQUENT_CHECK;
2732 }
2733
2734 ev_tstamp
2735 ev_timer_remaining (EV_P_ ev_timer *w)
2736 {
2737 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2738 }
2739
2740 #if EV_PERIODIC_ENABLE
2741 void noinline
2742 ev_periodic_start (EV_P_ ev_periodic *w)
2743 {
2744 if (expect_false (ev_is_active (w)))
2745 return;
2746
2747 if (w->reschedule_cb)
2748 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2749 else if (w->interval)
2750 {
2751 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2752 /* this formula differs from the one in periodic_reify because we do not always round up */
2753 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2754 }
2755 else
2756 ev_at (w) = w->offset;
2757
2758 EV_FREQUENT_CHECK;
2759
2760 ++periodiccnt;
2761 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2762 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2763 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2764 ANHE_at_cache (periodics [ev_active (w)]);
2765 upheap (periodics, ev_active (w));
2766
2767 EV_FREQUENT_CHECK;
2768
2769 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2770 }
2771
2772 void noinline
2773 ev_periodic_stop (EV_P_ ev_periodic *w)
2774 {
2775 clear_pending (EV_A_ (W)w);
2776 if (expect_false (!ev_is_active (w)))
2777 return;
2778
2779 EV_FREQUENT_CHECK;
2780
2781 {
2782 int active = ev_active (w);
2783
2784 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2785
2786 --periodiccnt;
2787
2788 if (expect_true (active < periodiccnt + HEAP0))
2789 {
2790 periodics [active] = periodics [periodiccnt + HEAP0];
2791 adjustheap (periodics, periodiccnt, active);
2792 }
2793 }
2794
2795 ev_stop (EV_A_ (W)w);
2796
2797 EV_FREQUENT_CHECK;
2798 }
2799
2800 void noinline
2801 ev_periodic_again (EV_P_ ev_periodic *w)
2802 {
2803 /* TODO: use adjustheap and recalculation */
2804 ev_periodic_stop (EV_A_ w);
2805 ev_periodic_start (EV_A_ w);
2806 }
2807 #endif
2808
2809 #ifndef SA_RESTART
2810 # define SA_RESTART 0
2811 #endif
2812
2813 #if EV_SIGNAL_ENABLE
2814
2815 void noinline
2816 ev_signal_start (EV_P_ ev_signal *w)
2817 {
2818 if (expect_false (ev_is_active (w)))
2819 return;
2820
2821 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2822
2823 #if EV_MULTIPLICITY
2824 assert (("libev: a signal must not be attached to two different loops",
2825 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2826
2827 signals [w->signum - 1].loop = EV_A;
2828 #endif
2829
2830 EV_FREQUENT_CHECK;
2831
2832 #if EV_USE_SIGNALFD
2833 if (sigfd == -2)
2834 {
2835 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2836 if (sigfd < 0 && errno == EINVAL)
2837 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2838
2839 if (sigfd >= 0)
2840 {
2841 fd_intern (sigfd); /* doing it twice will not hurt */
2842
2843 sigemptyset (&sigfd_set);
2844
2845 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2846 ev_set_priority (&sigfd_w, EV_MAXPRI);
2847 ev_io_start (EV_A_ &sigfd_w);
2848 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2849 }
2850 }
2851
2852 if (sigfd >= 0)
2853 {
2854 /* TODO: check .head */
2855 sigaddset (&sigfd_set, w->signum);
2856 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2857
2858 signalfd (sigfd, &sigfd_set, 0);
2859 }
2860 #endif
2861
2862 ev_start (EV_A_ (W)w, 1);
2863 wlist_add (&signals [w->signum - 1].head, (WL)w);
2864
2865 if (!((WL)w)->next)
2866 # if EV_USE_SIGNALFD
2867 if (sigfd < 0) /*TODO*/
2868 # endif
2869 {
2870 # ifdef _WIN32
2871 evpipe_init (EV_A);
2872
2873 signal (w->signum, ev_sighandler);
2874 # else
2875 struct sigaction sa;
2876
2877 evpipe_init (EV_A);
2878
2879 sa.sa_handler = ev_sighandler;
2880 sigfillset (&sa.sa_mask);
2881 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2882 sigaction (w->signum, &sa, 0);
2883
2884 sigemptyset (&sa.sa_mask);
2885 sigaddset (&sa.sa_mask, w->signum);
2886 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2887 #endif
2888 }
2889
2890 EV_FREQUENT_CHECK;
2891 }
2892
2893 void noinline
2894 ev_signal_stop (EV_P_ ev_signal *w)
2895 {
2896 clear_pending (EV_A_ (W)w);
2897 if (expect_false (!ev_is_active (w)))
2898 return;
2899
2900 EV_FREQUENT_CHECK;
2901
2902 wlist_del (&signals [w->signum - 1].head, (WL)w);
2903 ev_stop (EV_A_ (W)w);
2904
2905 if (!signals [w->signum - 1].head)
2906 {
2907 #if EV_MULTIPLICITY
2908 signals [w->signum - 1].loop = 0; /* unattach from signal */
2909 #endif
2910 #if EV_USE_SIGNALFD
2911 if (sigfd >= 0)
2912 {
2913 sigset_t ss;
2914
2915 sigemptyset (&ss);
2916 sigaddset (&ss, w->signum);
2917 sigdelset (&sigfd_set, w->signum);
2918
2919 signalfd (sigfd, &sigfd_set, 0);
2920 sigprocmask (SIG_UNBLOCK, &ss, 0);
2921 }
2922 else
2923 #endif
2924 signal (w->signum, SIG_DFL);
2925 }
2926
2927 EV_FREQUENT_CHECK;
2928 }
2929
2930 #endif
2931
2932 #if EV_CHILD_ENABLE
2933
2934 void
2935 ev_child_start (EV_P_ ev_child *w)
2936 {
2937 #if EV_MULTIPLICITY
2938 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2939 #endif
2940 if (expect_false (ev_is_active (w)))
2941 return;
2942
2943 EV_FREQUENT_CHECK;
2944
2945 ev_start (EV_A_ (W)w, 1);
2946 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2947
2948 EV_FREQUENT_CHECK;
2949 }
2950
2951 void
2952 ev_child_stop (EV_P_ ev_child *w)
2953 {
2954 clear_pending (EV_A_ (W)w);
2955 if (expect_false (!ev_is_active (w)))
2956 return;
2957
2958 EV_FREQUENT_CHECK;
2959
2960 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2961 ev_stop (EV_A_ (W)w);
2962
2963 EV_FREQUENT_CHECK;
2964 }
2965
2966 #endif
2967
2968 #if EV_STAT_ENABLE
2969
2970 # ifdef _WIN32
2971 # undef lstat
2972 # define lstat(a,b) _stati64 (a,b)
2973 # endif
2974
2975 #define DEF_STAT_INTERVAL 5.0074891
2976 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2977 #define MIN_STAT_INTERVAL 0.1074891
2978
2979 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2980
2981 #if EV_USE_INOTIFY
2982
2983 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
2984 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
2985
2986 static void noinline
2987 infy_add (EV_P_ ev_stat *w)
2988 {
2989 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);
2990
2991 if (w->wd >= 0)
2992 {
2993 struct statfs sfs;
2994
2995 /* now local changes will be tracked by inotify, but remote changes won't */
2996 /* unless the filesystem is known to be local, we therefore still poll */
2997 /* also do poll on <2.6.25, but with normal frequency */
2998
2999 if (!fs_2625)
3000 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3001 else if (!statfs (w->path, &sfs)
3002 && (sfs.f_type == 0x1373 /* devfs */
3003 || sfs.f_type == 0xEF53 /* ext2/3 */
3004 || sfs.f_type == 0x3153464a /* jfs */
3005 || sfs.f_type == 0x52654973 /* reiser3 */
3006 || sfs.f_type == 0x01021994 /* tempfs */
3007 || sfs.f_type == 0x58465342 /* xfs */))
3008 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3009 else
3010 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3011 }
3012 else
3013 {
3014 /* can't use inotify, continue to stat */
3015 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3016
3017 /* if path is not there, monitor some parent directory for speedup hints */
3018 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3019 /* but an efficiency issue only */
3020 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3021 {
3022 char path [4096];
3023 strcpy (path, w->path);
3024
3025 do
3026 {
3027 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3028 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3029
3030 char *pend = strrchr (path, '/');
3031
3032 if (!pend || pend == path)
3033 break;
3034
3035 *pend = 0;
3036 w->wd = inotify_add_watch (fs_fd, path, mask);
3037 }
3038 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3039 }
3040 }
3041
3042 if (w->wd >= 0)
3043 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3044
3045 /* now re-arm timer, if required */
3046 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3047 ev_timer_again (EV_A_ &w->timer);
3048 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3049 }
3050
3051 static void noinline
3052 infy_del (EV_P_ ev_stat *w)
3053 {
3054 int slot;
3055 int wd = w->wd;
3056
3057 if (wd < 0)
3058 return;
3059
3060 w->wd = -2;
3061 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3062 wlist_del (&fs_hash [slot].head, (WL)w);
3063
3064 /* remove this watcher, if others are watching it, they will rearm */
3065 inotify_rm_watch (fs_fd, wd);
3066 }
3067
3068 static void noinline
3069 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3070 {
3071 if (slot < 0)
3072 /* overflow, need to check for all hash slots */
3073 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3074 infy_wd (EV_A_ slot, wd, ev);
3075 else
3076 {
3077 WL w_;
3078
3079 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3080 {
3081 ev_stat *w = (ev_stat *)w_;
3082 w_ = w_->next; /* lets us remove this watcher and all before it */
3083
3084 if (w->wd == wd || wd == -1)
3085 {
3086 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3087 {
3088 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3089 w->wd = -1;
3090 infy_add (EV_A_ w); /* re-add, no matter what */
3091 }
3092
3093 stat_timer_cb (EV_A_ &w->timer, 0);
3094 }
3095 }
3096 }
3097 }
3098
3099 static void
3100 infy_cb (EV_P_ ev_io *w, int revents)
3101 {
3102 char buf [EV_INOTIFY_BUFSIZE];
3103 int ofs;
3104 int len = read (fs_fd, buf, sizeof (buf));
3105
3106 for (ofs = 0; ofs < len; )
3107 {
3108 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3109 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3110 ofs += sizeof (struct inotify_event) + ev->len;
3111 }
3112 }
3113
3114 inline_size void
3115 ev_check_2625 (EV_P)
3116 {
3117 /* kernels < 2.6.25 are borked
3118 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3119 */
3120 if (ev_linux_version () < 0x020619)
3121 return;
3122
3123 fs_2625 = 1;
3124 }
3125
3126 inline_size int
3127 infy_newfd (void)
3128 {
3129 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3130 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3131 if (fd >= 0)
3132 return fd;
3133 #endif
3134 return inotify_init ();
3135 }
3136
3137 inline_size void
3138 infy_init (EV_P)
3139 {
3140 if (fs_fd != -2)
3141 return;
3142
3143 fs_fd = -1;
3144
3145 ev_check_2625 (EV_A);
3146
3147 fs_fd = infy_newfd ();
3148
3149 if (fs_fd >= 0)
3150 {
3151 fd_intern (fs_fd);
3152 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3153 ev_set_priority (&fs_w, EV_MAXPRI);
3154 ev_io_start (EV_A_ &fs_w);
3155 ev_unref (EV_A);
3156 }
3157 }
3158
3159 inline_size void
3160 infy_fork (EV_P)
3161 {
3162 int slot;
3163
3164 if (fs_fd < 0)
3165 return;
3166
3167 ev_ref (EV_A);
3168 ev_io_stop (EV_A_ &fs_w);
3169 close (fs_fd);
3170 fs_fd = infy_newfd ();
3171
3172 if (fs_fd >= 0)
3173 {
3174 fd_intern (fs_fd);
3175 ev_io_set (&fs_w, fs_fd, EV_READ);
3176 ev_io_start (EV_A_ &fs_w);
3177 ev_unref (EV_A);
3178 }
3179
3180 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3181 {
3182 WL w_ = fs_hash [slot].head;
3183 fs_hash [slot].head = 0;
3184
3185 while (w_)
3186 {
3187 ev_stat *w = (ev_stat *)w_;
3188 w_ = w_->next; /* lets us add this watcher */
3189
3190 w->wd = -1;
3191
3192 if (fs_fd >= 0)
3193 infy_add (EV_A_ w); /* re-add, no matter what */
3194 else
3195 {
3196 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3197 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3198 ev_timer_again (EV_A_ &w->timer);
3199 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3200 }
3201 }
3202 }
3203 }
3204
3205 #endif
3206
3207 #ifdef _WIN32
3208 # define EV_LSTAT(p,b) _stati64 (p, b)
3209 #else
3210 # define EV_LSTAT(p,b) lstat (p, b)
3211 #endif
3212
3213 void
3214 ev_stat_stat (EV_P_ ev_stat *w)
3215 {
3216 if (lstat (w->path, &w->attr) < 0)
3217 w->attr.st_nlink = 0;
3218 else if (!w->attr.st_nlink)
3219 w->attr.st_nlink = 1;
3220 }
3221
3222 static void noinline
3223 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3224 {
3225 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3226
3227 ev_statdata prev = w->attr;
3228 ev_stat_stat (EV_A_ w);
3229
3230 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3231 if (
3232 prev.st_dev != w->attr.st_dev
3233 || prev.st_ino != w->attr.st_ino
3234 || prev.st_mode != w->attr.st_mode
3235 || prev.st_nlink != w->attr.st_nlink
3236 || prev.st_uid != w->attr.st_uid
3237 || prev.st_gid != w->attr.st_gid
3238 || prev.st_rdev != w->attr.st_rdev
3239 || prev.st_size != w->attr.st_size
3240 || prev.st_atime != w->attr.st_atime
3241 || prev.st_mtime != w->attr.st_mtime
3242 || prev.st_ctime != w->attr.st_ctime
3243 ) {
3244 /* we only update w->prev on actual differences */
3245 /* in case we test more often than invoke the callback, */
3246 /* to ensure that prev is always different to attr */
3247 w->prev = prev;
3248
3249 #if EV_USE_INOTIFY
3250 if (fs_fd >= 0)
3251 {
3252 infy_del (EV_A_ w);
3253 infy_add (EV_A_ w);
3254 ev_stat_stat (EV_A_ w); /* avoid race... */
3255 }
3256 #endif
3257
3258 ev_feed_event (EV_A_ w, EV_STAT);
3259 }
3260 }
3261
3262 void
3263 ev_stat_start (EV_P_ ev_stat *w)
3264 {
3265 if (expect_false (ev_is_active (w)))
3266 return;
3267
3268 ev_stat_stat (EV_A_ w);
3269
3270 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3271 w->interval = MIN_STAT_INTERVAL;
3272
3273 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3274 ev_set_priority (&w->timer, ev_priority (w));
3275
3276 #if EV_USE_INOTIFY
3277 infy_init (EV_A);
3278
3279 if (fs_fd >= 0)
3280 infy_add (EV_A_ w);
3281 else
3282 #endif
3283 {
3284 ev_timer_again (EV_A_ &w->timer);
3285 ev_unref (EV_A);
3286 }
3287
3288 ev_start (EV_A_ (W)w, 1);
3289
3290 EV_FREQUENT_CHECK;
3291 }
3292
3293 void
3294 ev_stat_stop (EV_P_ ev_stat *w)
3295 {
3296 clear_pending (EV_A_ (W)w);
3297 if (expect_false (!ev_is_active (w)))
3298 return;
3299
3300 EV_FREQUENT_CHECK;
3301
3302 #if EV_USE_INOTIFY
3303 infy_del (EV_A_ w);
3304 #endif
3305
3306 if (ev_is_active (&w->timer))
3307 {
3308 ev_ref (EV_A);
3309 ev_timer_stop (EV_A_ &w->timer);
3310 }
3311
3312 ev_stop (EV_A_ (W)w);
3313
3314 EV_FREQUENT_CHECK;
3315 }
3316 #endif
3317
3318 #if EV_IDLE_ENABLE
3319 void
3320 ev_idle_start (EV_P_ ev_idle *w)
3321 {
3322 if (expect_false (ev_is_active (w)))
3323 return;
3324
3325 pri_adjust (EV_A_ (W)w);
3326
3327 EV_FREQUENT_CHECK;
3328
3329 {
3330 int active = ++idlecnt [ABSPRI (w)];
3331
3332 ++idleall;
3333 ev_start (EV_A_ (W)w, active);
3334
3335 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3336 idles [ABSPRI (w)][active - 1] = w;
3337 }
3338
3339 EV_FREQUENT_CHECK;
3340 }
3341
3342 void
3343 ev_idle_stop (EV_P_ ev_idle *w)
3344 {
3345 clear_pending (EV_A_ (W)w);
3346 if (expect_false (!ev_is_active (w)))
3347 return;
3348
3349 EV_FREQUENT_CHECK;
3350
3351 {
3352 int active = ev_active (w);
3353
3354 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3355 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3356
3357 ev_stop (EV_A_ (W)w);
3358 --idleall;
3359 }
3360
3361 EV_FREQUENT_CHECK;
3362 }
3363 #endif
3364
3365 #if EV_PREPARE_ENABLE
3366 void
3367 ev_prepare_start (EV_P_ ev_prepare *w)
3368 {
3369 if (expect_false (ev_is_active (w)))
3370 return;
3371
3372 EV_FREQUENT_CHECK;
3373
3374 ev_start (EV_A_ (W)w, ++preparecnt);
3375 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3376 prepares [preparecnt - 1] = w;
3377
3378 EV_FREQUENT_CHECK;
3379 }
3380
3381 void
3382 ev_prepare_stop (EV_P_ ev_prepare *w)
3383 {
3384 clear_pending (EV_A_ (W)w);
3385 if (expect_false (!ev_is_active (w)))
3386 return;
3387
3388 EV_FREQUENT_CHECK;
3389
3390 {
3391 int active = ev_active (w);
3392
3393 prepares [active - 1] = prepares [--preparecnt];
3394 ev_active (prepares [active - 1]) = active;
3395 }
3396
3397 ev_stop (EV_A_ (W)w);
3398
3399 EV_FREQUENT_CHECK;
3400 }
3401 #endif
3402
3403 #if EV_CHECK_ENABLE
3404 void
3405 ev_check_start (EV_P_ ev_check *w)
3406 {
3407 if (expect_false (ev_is_active (w)))
3408 return;
3409
3410 EV_FREQUENT_CHECK;
3411
3412 ev_start (EV_A_ (W)w, ++checkcnt);
3413 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3414 checks [checkcnt - 1] = w;
3415
3416 EV_FREQUENT_CHECK;
3417 }
3418
3419 void
3420 ev_check_stop (EV_P_ ev_check *w)
3421 {
3422 clear_pending (EV_A_ (W)w);
3423 if (expect_false (!ev_is_active (w)))
3424 return;
3425
3426 EV_FREQUENT_CHECK;
3427
3428 {
3429 int active = ev_active (w);
3430
3431 checks [active - 1] = checks [--checkcnt];
3432 ev_active (checks [active - 1]) = active;
3433 }
3434
3435 ev_stop (EV_A_ (W)w);
3436
3437 EV_FREQUENT_CHECK;
3438 }
3439 #endif
3440
3441 #if EV_EMBED_ENABLE
3442 void noinline
3443 ev_embed_sweep (EV_P_ ev_embed *w)
3444 {
3445 ev_run (w->other, EVRUN_NOWAIT);
3446 }
3447
3448 static void
3449 embed_io_cb (EV_P_ ev_io *io, int revents)
3450 {
3451 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3452
3453 if (ev_cb (w))
3454 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3455 else
3456 ev_run (w->other, EVRUN_NOWAIT);
3457 }
3458
3459 static void
3460 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3461 {
3462 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3463
3464 {
3465 EV_P = w->other;
3466
3467 while (fdchangecnt)
3468 {
3469 fd_reify (EV_A);
3470 ev_run (EV_A_ EVRUN_NOWAIT);
3471 }
3472 }
3473 }
3474
3475 static void
3476 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3477 {
3478 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3479
3480 ev_embed_stop (EV_A_ w);
3481
3482 {
3483 EV_P = w->other;
3484
3485 ev_loop_fork (EV_A);
3486 ev_run (EV_A_ EVRUN_NOWAIT);
3487 }
3488
3489 ev_embed_start (EV_A_ w);
3490 }
3491
3492 #if 0
3493 static void
3494 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3495 {
3496 ev_idle_stop (EV_A_ idle);
3497 }
3498 #endif
3499
3500 void
3501 ev_embed_start (EV_P_ ev_embed *w)
3502 {
3503 if (expect_false (ev_is_active (w)))
3504 return;
3505
3506 {
3507 EV_P = w->other;
3508 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3509 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3510 }
3511
3512 EV_FREQUENT_CHECK;
3513
3514 ev_set_priority (&w->io, ev_priority (w));
3515 ev_io_start (EV_A_ &w->io);
3516
3517 ev_prepare_init (&w->prepare, embed_prepare_cb);
3518 ev_set_priority (&w->prepare, EV_MINPRI);
3519 ev_prepare_start (EV_A_ &w->prepare);
3520
3521 ev_fork_init (&w->fork, embed_fork_cb);
3522 ev_fork_start (EV_A_ &w->fork);
3523
3524 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3525
3526 ev_start (EV_A_ (W)w, 1);
3527
3528 EV_FREQUENT_CHECK;
3529 }
3530
3531 void
3532 ev_embed_stop (EV_P_ ev_embed *w)
3533 {
3534 clear_pending (EV_A_ (W)w);
3535 if (expect_false (!ev_is_active (w)))
3536 return;
3537
3538 EV_FREQUENT_CHECK;
3539
3540 ev_io_stop (EV_A_ &w->io);
3541 ev_prepare_stop (EV_A_ &w->prepare);
3542 ev_fork_stop (EV_A_ &w->fork);
3543
3544 ev_stop (EV_A_ (W)w);
3545
3546 EV_FREQUENT_CHECK;
3547 }
3548 #endif
3549
3550 #if EV_FORK_ENABLE
3551 void
3552 ev_fork_start (EV_P_ ev_fork *w)
3553 {
3554 if (expect_false (ev_is_active (w)))
3555 return;
3556
3557 EV_FREQUENT_CHECK;
3558
3559 ev_start (EV_A_ (W)w, ++forkcnt);
3560 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3561 forks [forkcnt - 1] = w;
3562
3563 EV_FREQUENT_CHECK;
3564 }
3565
3566 void
3567 ev_fork_stop (EV_P_ ev_fork *w)
3568 {
3569 clear_pending (EV_A_ (W)w);
3570 if (expect_false (!ev_is_active (w)))
3571 return;
3572
3573 EV_FREQUENT_CHECK;
3574
3575 {
3576 int active = ev_active (w);
3577
3578 forks [active - 1] = forks [--forkcnt];
3579 ev_active (forks [active - 1]) = active;
3580 }
3581
3582 ev_stop (EV_A_ (W)w);
3583
3584 EV_FREQUENT_CHECK;
3585 }
3586 #endif
3587
3588 #if EV_CLEANUP_ENABLE
3589 void
3590 ev_cleanup_start (EV_P_ ev_cleanup *w)
3591 {
3592 if (expect_false (ev_is_active (w)))
3593 return;
3594
3595 EV_FREQUENT_CHECK;
3596
3597 ev_start (EV_A_ (W)w, ++cleanupcnt);
3598 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3599 cleanups [cleanupcnt - 1] = w;
3600
3601 /* cleanup watchers should never keep a refcount on the loop */
3602 ev_unref (EV_A);
3603 EV_FREQUENT_CHECK;
3604 }
3605
3606 void
3607 ev_cleanup_stop (EV_P_ ev_cleanup *w)
3608 {
3609 clear_pending (EV_A_ (W)w);
3610 if (expect_false (!ev_is_active (w)))
3611 return;
3612
3613 EV_FREQUENT_CHECK;
3614 ev_ref (EV_A);
3615
3616 {
3617 int active = ev_active (w);
3618
3619 cleanups [active - 1] = cleanups [--cleanupcnt];
3620 ev_active (cleanups [active - 1]) = active;
3621 }
3622
3623 ev_stop (EV_A_ (W)w);
3624
3625 EV_FREQUENT_CHECK;
3626 }
3627 #endif
3628
3629 #if EV_ASYNC_ENABLE
3630 void
3631 ev_async_start (EV_P_ ev_async *w)
3632 {
3633 if (expect_false (ev_is_active (w)))
3634 return;
3635
3636 w->sent = 0;
3637
3638 evpipe_init (EV_A);
3639
3640 EV_FREQUENT_CHECK;
3641
3642 ev_start (EV_A_ (W)w, ++asynccnt);
3643 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3644 asyncs [asynccnt - 1] = w;
3645
3646 EV_FREQUENT_CHECK;
3647 }
3648
3649 void
3650 ev_async_stop (EV_P_ ev_async *w)
3651 {
3652 clear_pending (EV_A_ (W)w);
3653 if (expect_false (!ev_is_active (w)))
3654 return;
3655
3656 EV_FREQUENT_CHECK;
3657
3658 {
3659 int active = ev_active (w);
3660
3661 asyncs [active - 1] = asyncs [--asynccnt];
3662 ev_active (asyncs [active - 1]) = active;
3663 }
3664
3665 ev_stop (EV_A_ (W)w);
3666
3667 EV_FREQUENT_CHECK;
3668 }
3669
3670 void
3671 ev_async_send (EV_P_ ev_async *w)
3672 {
3673 w->sent = 1;
3674 evpipe_write (EV_A_ &async_pending);
3675 }
3676 #endif
3677
3678 /*****************************************************************************/
3679
3680 struct ev_once
3681 {
3682 ev_io io;
3683 ev_timer to;
3684 void (*cb)(int revents, void *arg);
3685 void *arg;
3686 };
3687
3688 static void
3689 once_cb (EV_P_ struct ev_once *once, int revents)
3690 {
3691 void (*cb)(int revents, void *arg) = once->cb;
3692 void *arg = once->arg;
3693
3694 ev_io_stop (EV_A_ &once->io);
3695 ev_timer_stop (EV_A_ &once->to);
3696 ev_free (once);
3697
3698 cb (revents, arg);
3699 }
3700
3701 static void
3702 once_cb_io (EV_P_ ev_io *w, int revents)
3703 {
3704 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3705
3706 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3707 }
3708
3709 static void
3710 once_cb_to (EV_P_ ev_timer *w, int revents)
3711 {
3712 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3713
3714 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3715 }
3716
3717 void
3718 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3719 {
3720 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3721
3722 if (expect_false (!once))
3723 {
3724 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3725 return;
3726 }
3727
3728 once->cb = cb;
3729 once->arg = arg;
3730
3731 ev_init (&once->io, once_cb_io);
3732 if (fd >= 0)
3733 {
3734 ev_io_set (&once->io, fd, events);
3735 ev_io_start (EV_A_ &once->io);
3736 }
3737
3738 ev_init (&once->to, once_cb_to);
3739 if (timeout >= 0.)
3740 {
3741 ev_timer_set (&once->to, timeout, 0.);
3742 ev_timer_start (EV_A_ &once->to);
3743 }
3744 }
3745
3746 /*****************************************************************************/
3747
3748 #if EV_WALK_ENABLE
3749 void
3750 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3751 {
3752 int i, j;
3753 ev_watcher_list *wl, *wn;
3754
3755 if (types & (EV_IO | EV_EMBED))
3756 for (i = 0; i < anfdmax; ++i)
3757 for (wl = anfds [i].head; wl; )
3758 {
3759 wn = wl->next;
3760
3761 #if EV_EMBED_ENABLE
3762 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3763 {
3764 if (types & EV_EMBED)
3765 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3766 }
3767 else
3768 #endif
3769 #if EV_USE_INOTIFY
3770 if (ev_cb ((ev_io *)wl) == infy_cb)
3771 ;
3772 else
3773 #endif
3774 if ((ev_io *)wl != &pipe_w)
3775 if (types & EV_IO)
3776 cb (EV_A_ EV_IO, wl);
3777
3778 wl = wn;
3779 }
3780
3781 if (types & (EV_TIMER | EV_STAT))
3782 for (i = timercnt + HEAP0; i-- > HEAP0; )
3783 #if EV_STAT_ENABLE
3784 /*TODO: timer is not always active*/
3785 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3786 {
3787 if (types & EV_STAT)
3788 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3789 }
3790 else
3791 #endif
3792 if (types & EV_TIMER)
3793 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3794
3795 #if EV_PERIODIC_ENABLE
3796 if (types & EV_PERIODIC)
3797 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3798 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3799 #endif
3800
3801 #if EV_IDLE_ENABLE
3802 if (types & EV_IDLE)
3803 for (j = NUMPRI; i--; )
3804 for (i = idlecnt [j]; i--; )
3805 cb (EV_A_ EV_IDLE, idles [j][i]);
3806 #endif
3807
3808 #if EV_FORK_ENABLE
3809 if (types & EV_FORK)
3810 for (i = forkcnt; i--; )
3811 if (ev_cb (forks [i]) != embed_fork_cb)
3812 cb (EV_A_ EV_FORK, forks [i]);
3813 #endif
3814
3815 #if EV_ASYNC_ENABLE
3816 if (types & EV_ASYNC)
3817 for (i = asynccnt; i--; )
3818 cb (EV_A_ EV_ASYNC, asyncs [i]);
3819 #endif
3820
3821 #if EV_PREPARE_ENABLE
3822 if (types & EV_PREPARE)
3823 for (i = preparecnt; i--; )
3824 # if EV_EMBED_ENABLE
3825 if (ev_cb (prepares [i]) != embed_prepare_cb)
3826 # endif
3827 cb (EV_A_ EV_PREPARE, prepares [i]);
3828 #endif
3829
3830 #if EV_CHECK_ENABLE
3831 if (types & EV_CHECK)
3832 for (i = checkcnt; i--; )
3833 cb (EV_A_ EV_CHECK, checks [i]);
3834 #endif
3835
3836 #if EV_SIGNAL_ENABLE
3837 if (types & EV_SIGNAL)
3838 for (i = 0; i < EV_NSIG - 1; ++i)
3839 for (wl = signals [i].head; wl; )
3840 {
3841 wn = wl->next;
3842 cb (EV_A_ EV_SIGNAL, wl);
3843 wl = wn;
3844 }
3845 #endif
3846
3847 #if EV_CHILD_ENABLE
3848 if (types & EV_CHILD)
3849 for (i = (EV_PID_HASHSIZE); i--; )
3850 for (wl = childs [i]; wl; )
3851 {
3852 wn = wl->next;
3853 cb (EV_A_ EV_CHILD, wl);
3854 wl = wn;
3855 }
3856 #endif
3857 /* EV_STAT 0x00001000 /* stat data changed */
3858 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
3859 }
3860 #endif
3861
3862 #if EV_MULTIPLICITY
3863 #include "ev_wrap.h"
3864 #endif
3865
3866 EV_CPP(})
3867