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/cvs/libev/ev.c
Revision: 1.370
Committed: Sun Jan 30 19:05:41 2011 UTC (13 years, 5 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.369: +15 -5 lines
Log Message:
periodic_recalc, hpux

File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 /* this big block deduces configuration from config.h */
41 #ifndef EV_STANDALONE
42 # ifdef EV_CONFIG_H
43 # include EV_CONFIG_H
44 # else
45 # include "config.h"
46 # endif
47
48 # if HAVE_CLOCK_SYSCALL
49 # ifndef EV_USE_CLOCK_SYSCALL
50 # define EV_USE_CLOCK_SYSCALL 1
51 # ifndef EV_USE_REALTIME
52 # define EV_USE_REALTIME 0
53 # endif
54 # ifndef EV_USE_MONOTONIC
55 # define EV_USE_MONOTONIC 1
56 # endif
57 # endif
58 # elif !defined(EV_USE_CLOCK_SYSCALL)
59 # define EV_USE_CLOCK_SYSCALL 0
60 # endif
61
62 # if HAVE_CLOCK_GETTIME
63 # ifndef EV_USE_MONOTONIC
64 # define EV_USE_MONOTONIC 1
65 # endif
66 # ifndef EV_USE_REALTIME
67 # define EV_USE_REALTIME 0
68 # endif
69 # else
70 # ifndef EV_USE_MONOTONIC
71 # define EV_USE_MONOTONIC 0
72 # endif
73 # ifndef EV_USE_REALTIME
74 # define EV_USE_REALTIME 0
75 # endif
76 # endif
77
78 # if HAVE_NANOSLEEP
79 # ifndef EV_USE_NANOSLEEP
80 # define EV_USE_NANOSLEEP EV_FEATURE_OS
81 # endif
82 # else
83 # undef EV_USE_NANOSLEEP
84 # define EV_USE_NANOSLEEP 0
85 # endif
86
87 # if HAVE_SELECT && HAVE_SYS_SELECT_H
88 # ifndef EV_USE_SELECT
89 # define EV_USE_SELECT EV_FEATURE_BACKENDS
90 # endif
91 # else
92 # undef EV_USE_SELECT
93 # define EV_USE_SELECT 0
94 # endif
95
96 # if HAVE_POLL && HAVE_POLL_H
97 # ifndef EV_USE_POLL
98 # define EV_USE_POLL EV_FEATURE_BACKENDS
99 # endif
100 # else
101 # undef EV_USE_POLL
102 # define EV_USE_POLL 0
103 # endif
104
105 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
106 # ifndef EV_USE_EPOLL
107 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
108 # endif
109 # else
110 # undef EV_USE_EPOLL
111 # define EV_USE_EPOLL 0
112 # endif
113
114 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
115 # ifndef EV_USE_KQUEUE
116 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
117 # endif
118 # else
119 # undef EV_USE_KQUEUE
120 # define EV_USE_KQUEUE 0
121 # endif
122
123 # if HAVE_PORT_H && HAVE_PORT_CREATE
124 # ifndef EV_USE_PORT
125 # define EV_USE_PORT EV_FEATURE_BACKENDS
126 # endif
127 # else
128 # undef EV_USE_PORT
129 # define EV_USE_PORT 0
130 # endif
131
132 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
133 # ifndef EV_USE_INOTIFY
134 # define EV_USE_INOTIFY EV_FEATURE_OS
135 # endif
136 # else
137 # undef EV_USE_INOTIFY
138 # define EV_USE_INOTIFY 0
139 # endif
140
141 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
142 # ifndef EV_USE_SIGNALFD
143 # define EV_USE_SIGNALFD EV_FEATURE_OS
144 # endif
145 # else
146 # undef EV_USE_SIGNALFD
147 # define EV_USE_SIGNALFD 0
148 # endif
149
150 # if HAVE_EVENTFD
151 # ifndef EV_USE_EVENTFD
152 # define EV_USE_EVENTFD EV_FEATURE_OS
153 # endif
154 # else
155 # undef EV_USE_EVENTFD
156 # define EV_USE_EVENTFD 0
157 # endif
158
159 #endif
160
161 #include <math.h>
162 #include <stdlib.h>
163 #include <string.h>
164 #include <fcntl.h>
165 #include <stddef.h>
166
167 #include <stdio.h>
168
169 #include <assert.h>
170 #include <errno.h>
171 #include <sys/types.h>
172 #include <time.h>
173 #include <limits.h>
174
175 #include <signal.h>
176
177 #ifdef EV_H
178 # include EV_H
179 #else
180 # include "ev.h"
181 #endif
182
183 EV_CPP(extern "C" {)
184
185 #ifndef _WIN32
186 # include <sys/time.h>
187 # include <sys/wait.h>
188 # include <unistd.h>
189 #else
190 # include <io.h>
191 # define WIN32_LEAN_AND_MEAN
192 # include <windows.h>
193 # ifndef EV_SELECT_IS_WINSOCKET
194 # define EV_SELECT_IS_WINSOCKET 1
195 # endif
196 # undef EV_AVOID_STDIO
197 #endif
198
199 /* OS X, in its infinite idiocy, actually HARDCODES
200 * a limit of 1024 into their select. Where people have brains,
201 * OS X engineers apparently have a vacuum. Or maybe they were
202 * ordered to have a vacuum, or they do anything for money.
203 * This might help. Or not.
204 */
205 #define _DARWIN_UNLIMITED_SELECT 1
206
207 /* this block tries to deduce configuration from header-defined symbols and defaults */
208
209 /* try to deduce the maximum number of signals on this platform */
210 #if defined (EV_NSIG)
211 /* use what's provided */
212 #elif defined (NSIG)
213 # define EV_NSIG (NSIG)
214 #elif defined(_NSIG)
215 # define EV_NSIG (_NSIG)
216 #elif defined (SIGMAX)
217 # define EV_NSIG (SIGMAX+1)
218 #elif defined (SIG_MAX)
219 # define EV_NSIG (SIG_MAX+1)
220 #elif defined (_SIG_MAX)
221 # define EV_NSIG (_SIG_MAX+1)
222 #elif defined (MAXSIG)
223 # define EV_NSIG (MAXSIG+1)
224 #elif defined (MAX_SIG)
225 # define EV_NSIG (MAX_SIG+1)
226 #elif defined (SIGARRAYSIZE)
227 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
228 #elif defined (_sys_nsig)
229 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
230 #else
231 # error "unable to find value for NSIG, please report"
232 /* to make it compile regardless, just remove the above line, */
233 /* but consider reporting it, too! :) */
234 # define EV_NSIG 65
235 #endif
236
237 #ifndef EV_USE_CLOCK_SYSCALL
238 # if __linux && __GLIBC__ >= 2
239 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
240 # else
241 # define EV_USE_CLOCK_SYSCALL 0
242 # endif
243 #endif
244
245 #ifndef EV_USE_MONOTONIC
246 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
247 # define EV_USE_MONOTONIC EV_FEATURE_OS
248 # else
249 # define EV_USE_MONOTONIC 0
250 # endif
251 #endif
252
253 #ifndef EV_USE_REALTIME
254 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
255 #endif
256
257 #ifndef EV_USE_NANOSLEEP
258 # if _POSIX_C_SOURCE >= 199309L
259 # define EV_USE_NANOSLEEP EV_FEATURE_OS
260 # else
261 # define EV_USE_NANOSLEEP 0
262 # endif
263 #endif
264
265 #ifndef EV_USE_SELECT
266 # define EV_USE_SELECT EV_FEATURE_BACKENDS
267 #endif
268
269 #ifndef EV_USE_POLL
270 # ifdef _WIN32
271 # define EV_USE_POLL 0
272 # else
273 # define EV_USE_POLL EV_FEATURE_BACKENDS
274 # endif
275 #endif
276
277 #ifndef EV_USE_EPOLL
278 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
279 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
280 # else
281 # define EV_USE_EPOLL 0
282 # endif
283 #endif
284
285 #ifndef EV_USE_KQUEUE
286 # define EV_USE_KQUEUE 0
287 #endif
288
289 #ifndef EV_USE_PORT
290 # define EV_USE_PORT 0
291 #endif
292
293 #ifndef EV_USE_INOTIFY
294 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
295 # define EV_USE_INOTIFY EV_FEATURE_OS
296 # else
297 # define EV_USE_INOTIFY 0
298 # endif
299 #endif
300
301 #ifndef EV_PID_HASHSIZE
302 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
303 #endif
304
305 #ifndef EV_INOTIFY_HASHSIZE
306 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
307 #endif
308
309 #ifndef EV_USE_EVENTFD
310 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
311 # define EV_USE_EVENTFD EV_FEATURE_OS
312 # else
313 # define EV_USE_EVENTFD 0
314 # endif
315 #endif
316
317 #ifndef EV_USE_SIGNALFD
318 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
319 # define EV_USE_SIGNALFD EV_FEATURE_OS
320 # else
321 # define EV_USE_SIGNALFD 0
322 # endif
323 #endif
324
325 #if 0 /* debugging */
326 # define EV_VERIFY 3
327 # define EV_USE_4HEAP 1
328 # define EV_HEAP_CACHE_AT 1
329 #endif
330
331 #ifndef EV_VERIFY
332 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
333 #endif
334
335 #ifndef EV_USE_4HEAP
336 # define EV_USE_4HEAP EV_FEATURE_DATA
337 #endif
338
339 #ifndef EV_HEAP_CACHE_AT
340 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
341 #endif
342
343 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
344 /* which makes programs even slower. might work on other unices, too. */
345 #if EV_USE_CLOCK_SYSCALL
346 # include <syscall.h>
347 # ifdef SYS_clock_gettime
348 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
349 # undef EV_USE_MONOTONIC
350 # define EV_USE_MONOTONIC 1
351 # else
352 # undef EV_USE_CLOCK_SYSCALL
353 # define EV_USE_CLOCK_SYSCALL 0
354 # endif
355 #endif
356
357 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
358
359 #ifdef _AIX
360 /* AIX has a completely broken poll.h header */
361 # undef EV_USE_POLL
362 # define EV_USE_POLL 0
363 #endif
364
365 #ifndef CLOCK_MONOTONIC
366 # undef EV_USE_MONOTONIC
367 # define EV_USE_MONOTONIC 0
368 #endif
369
370 #ifndef CLOCK_REALTIME
371 # undef EV_USE_REALTIME
372 # define EV_USE_REALTIME 0
373 #endif
374
375 #if !EV_STAT_ENABLE
376 # undef EV_USE_INOTIFY
377 # define EV_USE_INOTIFY 0
378 #endif
379
380 #if !EV_USE_NANOSLEEP
381 /* hp-ux has it in sys/time.h, which we unconditionally include above */
382 # if !defined(_WIN32) && !defined(__hpux)
383 # include <sys/select.h>
384 # endif
385 #endif
386
387 #if EV_USE_INOTIFY
388 # include <sys/statfs.h>
389 # include <sys/inotify.h>
390 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
391 # ifndef IN_DONT_FOLLOW
392 # undef EV_USE_INOTIFY
393 # define EV_USE_INOTIFY 0
394 # endif
395 #endif
396
397 #if EV_SELECT_IS_WINSOCKET
398 # include <winsock.h>
399 #endif
400
401 #if EV_USE_EVENTFD
402 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
403 # include <stdint.h>
404 # ifndef EFD_NONBLOCK
405 # define EFD_NONBLOCK O_NONBLOCK
406 # endif
407 # ifndef EFD_CLOEXEC
408 # ifdef O_CLOEXEC
409 # define EFD_CLOEXEC O_CLOEXEC
410 # else
411 # define EFD_CLOEXEC 02000000
412 # endif
413 # endif
414 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
415 #endif
416
417 #if EV_USE_SIGNALFD
418 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
419 # include <stdint.h>
420 # ifndef SFD_NONBLOCK
421 # define SFD_NONBLOCK O_NONBLOCK
422 # endif
423 # ifndef SFD_CLOEXEC
424 # ifdef O_CLOEXEC
425 # define SFD_CLOEXEC O_CLOEXEC
426 # else
427 # define SFD_CLOEXEC 02000000
428 # endif
429 # endif
430 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
431
432 struct signalfd_siginfo
433 {
434 uint32_t ssi_signo;
435 char pad[128 - sizeof (uint32_t)];
436 };
437 #endif
438
439 /**/
440
441 #if EV_VERIFY >= 3
442 # define EV_FREQUENT_CHECK ev_verify (EV_A)
443 #else
444 # define EV_FREQUENT_CHECK do { } while (0)
445 #endif
446
447 /*
448 * This is used to avoid floating point rounding problems.
449 * It is added to ev_rt_now when scheduling periodics
450 * to ensure progress, time-wise, even when rounding
451 * errors are against us.
452 * This value is good at least till the year 4000.
453 * Better solutions welcome.
454 */
455 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
456
457 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
458 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
459
460 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
461 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
462
463 #if __GNUC__ >= 4
464 # define expect(expr,value) __builtin_expect ((expr),(value))
465 # define noinline __attribute__ ((noinline))
466 #else
467 # define expect(expr,value) (expr)
468 # define noinline
469 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
470 # define inline
471 # endif
472 #endif
473
474 #define expect_false(expr) expect ((expr) != 0, 0)
475 #define expect_true(expr) expect ((expr) != 0, 1)
476 #define inline_size static inline
477
478 #if EV_FEATURE_CODE
479 # define inline_speed static inline
480 #else
481 # define inline_speed static noinline
482 #endif
483
484 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
485
486 #if EV_MINPRI == EV_MAXPRI
487 # define ABSPRI(w) (((W)w), 0)
488 #else
489 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
490 #endif
491
492 #define EMPTY /* required for microsofts broken pseudo-c compiler */
493 #define EMPTY2(a,b) /* used to suppress some warnings */
494
495 typedef ev_watcher *W;
496 typedef ev_watcher_list *WL;
497 typedef ev_watcher_time *WT;
498
499 #define ev_active(w) ((W)(w))->active
500 #define ev_at(w) ((WT)(w))->at
501
502 #if EV_USE_REALTIME
503 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
504 /* giving it a reasonably high chance of working on typical architectures */
505 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
506 #endif
507
508 #if EV_USE_MONOTONIC
509 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
510 #endif
511
512 #ifndef EV_FD_TO_WIN32_HANDLE
513 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
514 #endif
515 #ifndef EV_WIN32_HANDLE_TO_FD
516 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
517 #endif
518 #ifndef EV_WIN32_CLOSE_FD
519 # define EV_WIN32_CLOSE_FD(fd) close (fd)
520 #endif
521
522 #ifdef _WIN32
523 # include "ev_win32.c"
524 #endif
525
526 /*****************************************************************************/
527
528 #ifdef __linux
529 # include <sys/utsname.h>
530 #endif
531
532 static unsigned int noinline
533 ev_linux_version (void)
534 {
535 #ifdef __linux
536 unsigned int v = 0;
537 struct utsname buf;
538 int i;
539 char *p = buf.release;
540
541 if (uname (&buf))
542 return 0;
543
544 for (i = 3+1; --i; )
545 {
546 unsigned int c = 0;
547
548 for (;;)
549 {
550 if (*p >= '0' && *p <= '9')
551 c = c * 10 + *p++ - '0';
552 else
553 {
554 p += *p == '.';
555 break;
556 }
557 }
558
559 v = (v << 8) | c;
560 }
561
562 return v;
563 #else
564 return 0;
565 #endif
566 }
567
568 /*****************************************************************************/
569
570 #if EV_AVOID_STDIO
571 static void noinline
572 ev_printerr (const char *msg)
573 {
574 write (STDERR_FILENO, msg, strlen (msg));
575 }
576 #endif
577
578 static void (*syserr_cb)(const char *msg);
579
580 void
581 ev_set_syserr_cb (void (*cb)(const char *msg))
582 {
583 syserr_cb = cb;
584 }
585
586 static void noinline
587 ev_syserr (const char *msg)
588 {
589 if (!msg)
590 msg = "(libev) system error";
591
592 if (syserr_cb)
593 syserr_cb (msg);
594 else
595 {
596 #if EV_AVOID_STDIO
597 ev_printerr (msg);
598 ev_printerr (": ");
599 ev_printerr (strerror (errno));
600 ev_printerr ("\n");
601 #else
602 perror (msg);
603 #endif
604 abort ();
605 }
606 }
607
608 static void *
609 ev_realloc_emul (void *ptr, long size)
610 {
611 #if __GLIBC__
612 return realloc (ptr, size);
613 #else
614 /* some systems, notably openbsd and darwin, fail to properly
615 * implement realloc (x, 0) (as required by both ansi c-89 and
616 * the single unix specification, so work around them here.
617 */
618
619 if (size)
620 return realloc (ptr, size);
621
622 free (ptr);
623 return 0;
624 #endif
625 }
626
627 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
628
629 void
630 ev_set_allocator (void *(*cb)(void *ptr, long size))
631 {
632 alloc = cb;
633 }
634
635 inline_speed void *
636 ev_realloc (void *ptr, long size)
637 {
638 ptr = alloc (ptr, size);
639
640 if (!ptr && size)
641 {
642 #if EV_AVOID_STDIO
643 ev_printerr ("(libev) memory allocation failed, aborting.\n");
644 #else
645 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
646 #endif
647 abort ();
648 }
649
650 return ptr;
651 }
652
653 #define ev_malloc(size) ev_realloc (0, (size))
654 #define ev_free(ptr) ev_realloc ((ptr), 0)
655
656 /*****************************************************************************/
657
658 /* set in reify when reification needed */
659 #define EV_ANFD_REIFY 1
660
661 /* file descriptor info structure */
662 typedef struct
663 {
664 WL head;
665 unsigned char events; /* the events watched for */
666 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
667 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
668 unsigned char unused;
669 #if EV_USE_EPOLL
670 unsigned int egen; /* generation counter to counter epoll bugs */
671 #endif
672 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
673 SOCKET handle;
674 #endif
675 #if EV_USE_IOCP
676 OVERLAPPED or, ow;
677 #endif
678 } ANFD;
679
680 /* stores the pending event set for a given watcher */
681 typedef struct
682 {
683 W w;
684 int events; /* the pending event set for the given watcher */
685 } ANPENDING;
686
687 #if EV_USE_INOTIFY
688 /* hash table entry per inotify-id */
689 typedef struct
690 {
691 WL head;
692 } ANFS;
693 #endif
694
695 /* Heap Entry */
696 #if EV_HEAP_CACHE_AT
697 /* a heap element */
698 typedef struct {
699 ev_tstamp at;
700 WT w;
701 } ANHE;
702
703 #define ANHE_w(he) (he).w /* access watcher, read-write */
704 #define ANHE_at(he) (he).at /* access cached at, read-only */
705 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
706 #else
707 /* a heap element */
708 typedef WT ANHE;
709
710 #define ANHE_w(he) (he)
711 #define ANHE_at(he) (he)->at
712 #define ANHE_at_cache(he)
713 #endif
714
715 #if EV_MULTIPLICITY
716
717 struct ev_loop
718 {
719 ev_tstamp ev_rt_now;
720 #define ev_rt_now ((loop)->ev_rt_now)
721 #define VAR(name,decl) decl;
722 #include "ev_vars.h"
723 #undef VAR
724 };
725 #include "ev_wrap.h"
726
727 static struct ev_loop default_loop_struct;
728 struct ev_loop *ev_default_loop_ptr;
729
730 #else
731
732 ev_tstamp ev_rt_now;
733 #define VAR(name,decl) static decl;
734 #include "ev_vars.h"
735 #undef VAR
736
737 static int ev_default_loop_ptr;
738
739 #endif
740
741 #if EV_FEATURE_API
742 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
743 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
744 # define EV_INVOKE_PENDING invoke_cb (EV_A)
745 #else
746 # define EV_RELEASE_CB (void)0
747 # define EV_ACQUIRE_CB (void)0
748 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
749 #endif
750
751 #define EVBREAK_RECURSE 0x80
752
753 /*****************************************************************************/
754
755 #ifndef EV_HAVE_EV_TIME
756 ev_tstamp
757 ev_time (void)
758 {
759 #if EV_USE_REALTIME
760 if (expect_true (have_realtime))
761 {
762 struct timespec ts;
763 clock_gettime (CLOCK_REALTIME, &ts);
764 return ts.tv_sec + ts.tv_nsec * 1e-9;
765 }
766 #endif
767
768 struct timeval tv;
769 gettimeofday (&tv, 0);
770 return tv.tv_sec + tv.tv_usec * 1e-6;
771 }
772 #endif
773
774 inline_size ev_tstamp
775 get_clock (void)
776 {
777 #if EV_USE_MONOTONIC
778 if (expect_true (have_monotonic))
779 {
780 struct timespec ts;
781 clock_gettime (CLOCK_MONOTONIC, &ts);
782 return ts.tv_sec + ts.tv_nsec * 1e-9;
783 }
784 #endif
785
786 return ev_time ();
787 }
788
789 #if EV_MULTIPLICITY
790 ev_tstamp
791 ev_now (EV_P)
792 {
793 return ev_rt_now;
794 }
795 #endif
796
797 void
798 ev_sleep (ev_tstamp delay)
799 {
800 if (delay > 0.)
801 {
802 #if EV_USE_NANOSLEEP
803 struct timespec ts;
804
805 EV_TS_SET (ts, delay);
806 nanosleep (&ts, 0);
807 #elif defined(_WIN32)
808 Sleep ((unsigned long)(delay * 1e3));
809 #else
810 struct timeval tv;
811
812 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
813 /* something not guaranteed by newer posix versions, but guaranteed */
814 /* by older ones */
815 EV_TV_SET (tv, delay);
816 select (0, 0, 0, 0, &tv);
817 #endif
818 }
819 }
820
821 inline_speed int
822 ev_timeout_to_ms (ev_tstamp timeout)
823 {
824 int ms = timeout * 1000. + .999999;
825
826 return expect_true (ms) ? ms : timeout < 1e-6 ? 0 : 1;
827 }
828
829 /*****************************************************************************/
830
831 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
832
833 /* find a suitable new size for the given array, */
834 /* hopefully by rounding to a nice-to-malloc size */
835 inline_size int
836 array_nextsize (int elem, int cur, int cnt)
837 {
838 int ncur = cur + 1;
839
840 do
841 ncur <<= 1;
842 while (cnt > ncur);
843
844 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
845 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
846 {
847 ncur *= elem;
848 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
849 ncur = ncur - sizeof (void *) * 4;
850 ncur /= elem;
851 }
852
853 return ncur;
854 }
855
856 static noinline void *
857 array_realloc (int elem, void *base, int *cur, int cnt)
858 {
859 *cur = array_nextsize (elem, *cur, cnt);
860 return ev_realloc (base, elem * *cur);
861 }
862
863 #define array_init_zero(base,count) \
864 memset ((void *)(base), 0, sizeof (*(base)) * (count))
865
866 #define array_needsize(type,base,cur,cnt,init) \
867 if (expect_false ((cnt) > (cur))) \
868 { \
869 int ocur_ = (cur); \
870 (base) = (type *)array_realloc \
871 (sizeof (type), (base), &(cur), (cnt)); \
872 init ((base) + (ocur_), (cur) - ocur_); \
873 }
874
875 #if 0
876 #define array_slim(type,stem) \
877 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
878 { \
879 stem ## max = array_roundsize (stem ## cnt >> 1); \
880 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
881 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
882 }
883 #endif
884
885 #define array_free(stem, idx) \
886 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
887
888 /*****************************************************************************/
889
890 /* dummy callback for pending events */
891 static void noinline
892 pendingcb (EV_P_ ev_prepare *w, int revents)
893 {
894 }
895
896 void noinline
897 ev_feed_event (EV_P_ void *w, int revents)
898 {
899 W w_ = (W)w;
900 int pri = ABSPRI (w_);
901
902 if (expect_false (w_->pending))
903 pendings [pri][w_->pending - 1].events |= revents;
904 else
905 {
906 w_->pending = ++pendingcnt [pri];
907 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
908 pendings [pri][w_->pending - 1].w = w_;
909 pendings [pri][w_->pending - 1].events = revents;
910 }
911 }
912
913 inline_speed void
914 feed_reverse (EV_P_ W w)
915 {
916 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
917 rfeeds [rfeedcnt++] = w;
918 }
919
920 inline_size void
921 feed_reverse_done (EV_P_ int revents)
922 {
923 do
924 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
925 while (rfeedcnt);
926 }
927
928 inline_speed void
929 queue_events (EV_P_ W *events, int eventcnt, int type)
930 {
931 int i;
932
933 for (i = 0; i < eventcnt; ++i)
934 ev_feed_event (EV_A_ events [i], type);
935 }
936
937 /*****************************************************************************/
938
939 inline_speed void
940 fd_event_nocheck (EV_P_ int fd, int revents)
941 {
942 ANFD *anfd = anfds + fd;
943 ev_io *w;
944
945 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
946 {
947 int ev = w->events & revents;
948
949 if (ev)
950 ev_feed_event (EV_A_ (W)w, ev);
951 }
952 }
953
954 /* do not submit kernel events for fds that have reify set */
955 /* because that means they changed while we were polling for new events */
956 inline_speed void
957 fd_event (EV_P_ int fd, int revents)
958 {
959 ANFD *anfd = anfds + fd;
960
961 if (expect_true (!anfd->reify))
962 fd_event_nocheck (EV_A_ fd, revents);
963 }
964
965 void
966 ev_feed_fd_event (EV_P_ int fd, int revents)
967 {
968 if (fd >= 0 && fd < anfdmax)
969 fd_event_nocheck (EV_A_ fd, revents);
970 }
971
972 /* make sure the external fd watch events are in-sync */
973 /* with the kernel/libev internal state */
974 inline_size void
975 fd_reify (EV_P)
976 {
977 int i;
978
979 for (i = 0; i < fdchangecnt; ++i)
980 {
981 int fd = fdchanges [i];
982 ANFD *anfd = anfds + fd;
983 ev_io *w;
984
985 unsigned char o_events = anfd->events;
986 unsigned char o_reify = anfd->reify;
987
988 anfd->reify = 0;
989
990 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
991 if (o_reify & EV__IOFDSET)
992 {
993 unsigned long arg;
994 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
995 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
996 printf ("oi %d %x\n", fd, anfd->handle);//D
997 }
998 #endif
999
1000 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1001 {
1002 anfd->events = 0;
1003
1004 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1005 anfd->events |= (unsigned char)w->events;
1006
1007 if (o_events != anfd->events)
1008 o_reify = EV__IOFDSET; /* actually |= */
1009 }
1010
1011 if (o_reify & EV__IOFDSET)
1012 backend_modify (EV_A_ fd, o_events, anfd->events);
1013 }
1014
1015 fdchangecnt = 0;
1016 }
1017
1018 /* something about the given fd changed */
1019 inline_size void
1020 fd_change (EV_P_ int fd, int flags)
1021 {
1022 unsigned char reify = anfds [fd].reify;
1023 anfds [fd].reify |= flags;
1024
1025 if (expect_true (!reify))
1026 {
1027 ++fdchangecnt;
1028 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1029 fdchanges [fdchangecnt - 1] = fd;
1030 }
1031 }
1032
1033 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1034 inline_speed void
1035 fd_kill (EV_P_ int fd)
1036 {
1037 ev_io *w;
1038
1039 while ((w = (ev_io *)anfds [fd].head))
1040 {
1041 ev_io_stop (EV_A_ w);
1042 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1043 }
1044 }
1045
1046 /* check whether the given fd is actually valid, for error recovery */
1047 inline_size int
1048 fd_valid (int fd)
1049 {
1050 #ifdef _WIN32
1051 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1052 #else
1053 return fcntl (fd, F_GETFD) != -1;
1054 #endif
1055 }
1056
1057 /* called on EBADF to verify fds */
1058 static void noinline
1059 fd_ebadf (EV_P)
1060 {
1061 int fd;
1062
1063 for (fd = 0; fd < anfdmax; ++fd)
1064 if (anfds [fd].events)
1065 if (!fd_valid (fd) && errno == EBADF)
1066 fd_kill (EV_A_ fd);
1067 }
1068
1069 /* called on ENOMEM in select/poll to kill some fds and retry */
1070 static void noinline
1071 fd_enomem (EV_P)
1072 {
1073 int fd;
1074
1075 for (fd = anfdmax; fd--; )
1076 if (anfds [fd].events)
1077 {
1078 fd_kill (EV_A_ fd);
1079 break;
1080 }
1081 }
1082
1083 /* usually called after fork if backend needs to re-arm all fds from scratch */
1084 static void noinline
1085 fd_rearm_all (EV_P)
1086 {
1087 int fd;
1088
1089 for (fd = 0; fd < anfdmax; ++fd)
1090 if (anfds [fd].events)
1091 {
1092 anfds [fd].events = 0;
1093 anfds [fd].emask = 0;
1094 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1095 }
1096 }
1097
1098 /* used to prepare libev internal fd's */
1099 /* this is not fork-safe */
1100 inline_speed void
1101 fd_intern (int fd)
1102 {
1103 #ifdef _WIN32
1104 unsigned long arg = 1;
1105 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1106 #else
1107 fcntl (fd, F_SETFD, FD_CLOEXEC);
1108 fcntl (fd, F_SETFL, O_NONBLOCK);
1109 #endif
1110 }
1111
1112 /*****************************************************************************/
1113
1114 /*
1115 * the heap functions want a real array index. array index 0 is guaranteed to not
1116 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1117 * the branching factor of the d-tree.
1118 */
1119
1120 /*
1121 * at the moment we allow libev the luxury of two heaps,
1122 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1123 * which is more cache-efficient.
1124 * the difference is about 5% with 50000+ watchers.
1125 */
1126 #if EV_USE_4HEAP
1127
1128 #define DHEAP 4
1129 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1130 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1131 #define UPHEAP_DONE(p,k) ((p) == (k))
1132
1133 /* away from the root */
1134 inline_speed void
1135 downheap (ANHE *heap, int N, int k)
1136 {
1137 ANHE he = heap [k];
1138 ANHE *E = heap + N + HEAP0;
1139
1140 for (;;)
1141 {
1142 ev_tstamp minat;
1143 ANHE *minpos;
1144 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1145
1146 /* find minimum child */
1147 if (expect_true (pos + DHEAP - 1 < E))
1148 {
1149 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1150 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1151 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1152 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1153 }
1154 else if (pos < E)
1155 {
1156 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1157 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1158 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1159 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1160 }
1161 else
1162 break;
1163
1164 if (ANHE_at (he) <= minat)
1165 break;
1166
1167 heap [k] = *minpos;
1168 ev_active (ANHE_w (*minpos)) = k;
1169
1170 k = minpos - heap;
1171 }
1172
1173 heap [k] = he;
1174 ev_active (ANHE_w (he)) = k;
1175 }
1176
1177 #else /* 4HEAP */
1178
1179 #define HEAP0 1
1180 #define HPARENT(k) ((k) >> 1)
1181 #define UPHEAP_DONE(p,k) (!(p))
1182
1183 /* away from the root */
1184 inline_speed void
1185 downheap (ANHE *heap, int N, int k)
1186 {
1187 ANHE he = heap [k];
1188
1189 for (;;)
1190 {
1191 int c = k << 1;
1192
1193 if (c >= N + HEAP0)
1194 break;
1195
1196 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1197 ? 1 : 0;
1198
1199 if (ANHE_at (he) <= ANHE_at (heap [c]))
1200 break;
1201
1202 heap [k] = heap [c];
1203 ev_active (ANHE_w (heap [k])) = k;
1204
1205 k = c;
1206 }
1207
1208 heap [k] = he;
1209 ev_active (ANHE_w (he)) = k;
1210 }
1211 #endif
1212
1213 /* towards the root */
1214 inline_speed void
1215 upheap (ANHE *heap, int k)
1216 {
1217 ANHE he = heap [k];
1218
1219 for (;;)
1220 {
1221 int p = HPARENT (k);
1222
1223 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1224 break;
1225
1226 heap [k] = heap [p];
1227 ev_active (ANHE_w (heap [k])) = k;
1228 k = p;
1229 }
1230
1231 heap [k] = he;
1232 ev_active (ANHE_w (he)) = k;
1233 }
1234
1235 /* move an element suitably so it is in a correct place */
1236 inline_size void
1237 adjustheap (ANHE *heap, int N, int k)
1238 {
1239 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1240 upheap (heap, k);
1241 else
1242 downheap (heap, N, k);
1243 }
1244
1245 /* rebuild the heap: this function is used only once and executed rarely */
1246 inline_size void
1247 reheap (ANHE *heap, int N)
1248 {
1249 int i;
1250
1251 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1252 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1253 for (i = 0; i < N; ++i)
1254 upheap (heap, i + HEAP0);
1255 }
1256
1257 /*****************************************************************************/
1258
1259 /* associate signal watchers to a signal signal */
1260 typedef struct
1261 {
1262 EV_ATOMIC_T pending;
1263 #if EV_MULTIPLICITY
1264 EV_P;
1265 #endif
1266 WL head;
1267 } ANSIG;
1268
1269 static ANSIG signals [EV_NSIG - 1];
1270
1271 /*****************************************************************************/
1272
1273 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1274
1275 static void noinline
1276 evpipe_init (EV_P)
1277 {
1278 if (!ev_is_active (&pipe_w))
1279 {
1280 # if EV_USE_EVENTFD
1281 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1282 if (evfd < 0 && errno == EINVAL)
1283 evfd = eventfd (0, 0);
1284
1285 if (evfd >= 0)
1286 {
1287 evpipe [0] = -1;
1288 fd_intern (evfd); /* doing it twice doesn't hurt */
1289 ev_io_set (&pipe_w, evfd, EV_READ);
1290 }
1291 else
1292 # endif
1293 {
1294 while (pipe (evpipe))
1295 ev_syserr ("(libev) error creating signal/async pipe");
1296
1297 fd_intern (evpipe [0]);
1298 fd_intern (evpipe [1]);
1299 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1300 }
1301
1302 ev_io_start (EV_A_ &pipe_w);
1303 ev_unref (EV_A); /* watcher should not keep loop alive */
1304 }
1305 }
1306
1307 inline_size void
1308 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1309 {
1310 if (!*flag)
1311 {
1312 int old_errno = errno; /* save errno because write might clobber it */
1313 char dummy;
1314
1315 *flag = 1;
1316
1317 #if EV_USE_EVENTFD
1318 if (evfd >= 0)
1319 {
1320 uint64_t counter = 1;
1321 write (evfd, &counter, sizeof (uint64_t));
1322 }
1323 else
1324 #endif
1325 /* win32 people keep sending patches that change this write() to send() */
1326 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1327 /* so when you think this write should be a send instead, please find out */
1328 /* where your send() is from - it's definitely not the microsoft send, and */
1329 /* tell me. thank you. */
1330 write (evpipe [1], &dummy, 1);
1331
1332 errno = old_errno;
1333 }
1334 }
1335
1336 /* called whenever the libev signal pipe */
1337 /* got some events (signal, async) */
1338 static void
1339 pipecb (EV_P_ ev_io *iow, int revents)
1340 {
1341 int i;
1342
1343 #if EV_USE_EVENTFD
1344 if (evfd >= 0)
1345 {
1346 uint64_t counter;
1347 read (evfd, &counter, sizeof (uint64_t));
1348 }
1349 else
1350 #endif
1351 {
1352 char dummy;
1353 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1354 read (evpipe [0], &dummy, 1);
1355 }
1356
1357 #if EV_SIGNAL_ENABLE
1358 if (sig_pending)
1359 {
1360 sig_pending = 0;
1361
1362 for (i = EV_NSIG - 1; i--; )
1363 if (expect_false (signals [i].pending))
1364 ev_feed_signal_event (EV_A_ i + 1);
1365 }
1366 #endif
1367
1368 #if EV_ASYNC_ENABLE
1369 if (async_pending)
1370 {
1371 async_pending = 0;
1372
1373 for (i = asynccnt; i--; )
1374 if (asyncs [i]->sent)
1375 {
1376 asyncs [i]->sent = 0;
1377 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1378 }
1379 }
1380 #endif
1381 }
1382
1383 /*****************************************************************************/
1384
1385 void
1386 ev_feed_signal (int signum)
1387 {
1388 #if EV_MULTIPLICITY
1389 EV_P = signals [signum - 1].loop;
1390
1391 if (!EV_A)
1392 return;
1393 #endif
1394
1395 signals [signum - 1].pending = 1;
1396 evpipe_write (EV_A_ &sig_pending);
1397 }
1398
1399 static void
1400 ev_sighandler (int signum)
1401 {
1402 #ifdef _WIN32
1403 signal (signum, ev_sighandler);
1404 #endif
1405
1406 ev_feed_signal (signum);
1407 }
1408
1409 void noinline
1410 ev_feed_signal_event (EV_P_ int signum)
1411 {
1412 WL w;
1413
1414 if (expect_false (signum <= 0 || signum > EV_NSIG))
1415 return;
1416
1417 --signum;
1418
1419 #if EV_MULTIPLICITY
1420 /* it is permissible to try to feed a signal to the wrong loop */
1421 /* or, likely more useful, feeding a signal nobody is waiting for */
1422
1423 if (expect_false (signals [signum].loop != EV_A))
1424 return;
1425 #endif
1426
1427 signals [signum].pending = 0;
1428
1429 for (w = signals [signum].head; w; w = w->next)
1430 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1431 }
1432
1433 #if EV_USE_SIGNALFD
1434 static void
1435 sigfdcb (EV_P_ ev_io *iow, int revents)
1436 {
1437 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1438
1439 for (;;)
1440 {
1441 ssize_t res = read (sigfd, si, sizeof (si));
1442
1443 /* not ISO-C, as res might be -1, but works with SuS */
1444 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1445 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1446
1447 if (res < (ssize_t)sizeof (si))
1448 break;
1449 }
1450 }
1451 #endif
1452
1453 #endif
1454
1455 /*****************************************************************************/
1456
1457 #if EV_CHILD_ENABLE
1458 static WL childs [EV_PID_HASHSIZE];
1459
1460 static ev_signal childev;
1461
1462 #ifndef WIFCONTINUED
1463 # define WIFCONTINUED(status) 0
1464 #endif
1465
1466 /* handle a single child status event */
1467 inline_speed void
1468 child_reap (EV_P_ int chain, int pid, int status)
1469 {
1470 ev_child *w;
1471 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1472
1473 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1474 {
1475 if ((w->pid == pid || !w->pid)
1476 && (!traced || (w->flags & 1)))
1477 {
1478 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1479 w->rpid = pid;
1480 w->rstatus = status;
1481 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1482 }
1483 }
1484 }
1485
1486 #ifndef WCONTINUED
1487 # define WCONTINUED 0
1488 #endif
1489
1490 /* called on sigchld etc., calls waitpid */
1491 static void
1492 childcb (EV_P_ ev_signal *sw, int revents)
1493 {
1494 int pid, status;
1495
1496 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1497 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1498 if (!WCONTINUED
1499 || errno != EINVAL
1500 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1501 return;
1502
1503 /* make sure we are called again until all children have been reaped */
1504 /* we need to do it this way so that the callback gets called before we continue */
1505 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1506
1507 child_reap (EV_A_ pid, pid, status);
1508 if ((EV_PID_HASHSIZE) > 1)
1509 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1510 }
1511
1512 #endif
1513
1514 /*****************************************************************************/
1515
1516 #if EV_USE_IOCP
1517 # include "ev_iocp.c"
1518 #endif
1519 #if EV_USE_PORT
1520 # include "ev_port.c"
1521 #endif
1522 #if EV_USE_KQUEUE
1523 # include "ev_kqueue.c"
1524 #endif
1525 #if EV_USE_EPOLL
1526 # include "ev_epoll.c"
1527 #endif
1528 #if EV_USE_POLL
1529 # include "ev_poll.c"
1530 #endif
1531 #if EV_USE_SELECT
1532 # include "ev_select.c"
1533 #endif
1534
1535 int
1536 ev_version_major (void)
1537 {
1538 return EV_VERSION_MAJOR;
1539 }
1540
1541 int
1542 ev_version_minor (void)
1543 {
1544 return EV_VERSION_MINOR;
1545 }
1546
1547 /* return true if we are running with elevated privileges and should ignore env variables */
1548 int inline_size
1549 enable_secure (void)
1550 {
1551 #ifdef _WIN32
1552 return 0;
1553 #else
1554 return getuid () != geteuid ()
1555 || getgid () != getegid ();
1556 #endif
1557 }
1558
1559 unsigned int
1560 ev_supported_backends (void)
1561 {
1562 unsigned int flags = 0;
1563
1564 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1565 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1566 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1567 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1568 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1569
1570 return flags;
1571 }
1572
1573 unsigned int
1574 ev_recommended_backends (void)
1575 {
1576 unsigned int flags = ev_supported_backends ();
1577
1578 #ifndef __NetBSD__
1579 /* kqueue is borked on everything but netbsd apparently */
1580 /* it usually doesn't work correctly on anything but sockets and pipes */
1581 flags &= ~EVBACKEND_KQUEUE;
1582 #endif
1583 #ifdef __APPLE__
1584 /* only select works correctly on that "unix-certified" platform */
1585 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1586 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1587 #endif
1588 #ifdef __FreeBSD__
1589 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1590 #endif
1591
1592 return flags;
1593 }
1594
1595 unsigned int
1596 ev_embeddable_backends (void)
1597 {
1598 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1599
1600 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1601 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1602 flags &= ~EVBACKEND_EPOLL;
1603
1604 return flags;
1605 }
1606
1607 unsigned int
1608 ev_backend (EV_P)
1609 {
1610 return backend;
1611 }
1612
1613 #if EV_FEATURE_API
1614 unsigned int
1615 ev_iteration (EV_P)
1616 {
1617 return loop_count;
1618 }
1619
1620 unsigned int
1621 ev_depth (EV_P)
1622 {
1623 return loop_depth;
1624 }
1625
1626 void
1627 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1628 {
1629 io_blocktime = interval;
1630 }
1631
1632 void
1633 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1634 {
1635 timeout_blocktime = interval;
1636 }
1637
1638 void
1639 ev_set_userdata (EV_P_ void *data)
1640 {
1641 userdata = data;
1642 }
1643
1644 void *
1645 ev_userdata (EV_P)
1646 {
1647 return userdata;
1648 }
1649
1650 void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1651 {
1652 invoke_cb = invoke_pending_cb;
1653 }
1654
1655 void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1656 {
1657 release_cb = release;
1658 acquire_cb = acquire;
1659 }
1660 #endif
1661
1662 /* initialise a loop structure, must be zero-initialised */
1663 static void noinline
1664 loop_init (EV_P_ unsigned int flags)
1665 {
1666 if (!backend)
1667 {
1668 origflags = flags;
1669
1670 #if EV_USE_REALTIME
1671 if (!have_realtime)
1672 {
1673 struct timespec ts;
1674
1675 if (!clock_gettime (CLOCK_REALTIME, &ts))
1676 have_realtime = 1;
1677 }
1678 #endif
1679
1680 #if EV_USE_MONOTONIC
1681 if (!have_monotonic)
1682 {
1683 struct timespec ts;
1684
1685 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1686 have_monotonic = 1;
1687 }
1688 #endif
1689
1690 /* pid check not overridable via env */
1691 #ifndef _WIN32
1692 if (flags & EVFLAG_FORKCHECK)
1693 curpid = getpid ();
1694 #endif
1695
1696 if (!(flags & EVFLAG_NOENV)
1697 && !enable_secure ()
1698 && getenv ("LIBEV_FLAGS"))
1699 flags = atoi (getenv ("LIBEV_FLAGS"));
1700
1701 ev_rt_now = ev_time ();
1702 mn_now = get_clock ();
1703 now_floor = mn_now;
1704 rtmn_diff = ev_rt_now - mn_now;
1705 #if EV_FEATURE_API
1706 invoke_cb = ev_invoke_pending;
1707 #endif
1708
1709 io_blocktime = 0.;
1710 timeout_blocktime = 0.;
1711 backend = 0;
1712 backend_fd = -1;
1713 sig_pending = 0;
1714 #if EV_ASYNC_ENABLE
1715 async_pending = 0;
1716 #endif
1717 #if EV_USE_INOTIFY
1718 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1719 #endif
1720 #if EV_USE_SIGNALFD
1721 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1722 #endif
1723
1724 if (!(flags & EVBACKEND_MASK))
1725 flags |= ev_recommended_backends ();
1726
1727 #if EV_USE_IOCP
1728 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1729 #endif
1730 #if EV_USE_PORT
1731 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1732 #endif
1733 #if EV_USE_KQUEUE
1734 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1735 #endif
1736 #if EV_USE_EPOLL
1737 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1738 #endif
1739 #if EV_USE_POLL
1740 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1741 #endif
1742 #if EV_USE_SELECT
1743 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1744 #endif
1745
1746 ev_prepare_init (&pending_w, pendingcb);
1747
1748 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1749 ev_init (&pipe_w, pipecb);
1750 ev_set_priority (&pipe_w, EV_MAXPRI);
1751 #endif
1752 }
1753 }
1754
1755 /* free up a loop structure */
1756 void
1757 ev_loop_destroy (EV_P)
1758 {
1759 int i;
1760
1761 #if EV_MULTIPLICITY
1762 /* mimic free (0) */
1763 if (!EV_A)
1764 return;
1765 #endif
1766
1767 #if EV_CLEANUP_ENABLE
1768 /* queue cleanup watchers (and execute them) */
1769 if (expect_false (cleanupcnt))
1770 {
1771 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1772 EV_INVOKE_PENDING;
1773 }
1774 #endif
1775
1776 #if EV_CHILD_ENABLE
1777 if (ev_is_active (&childev))
1778 {
1779 ev_ref (EV_A); /* child watcher */
1780 ev_signal_stop (EV_A_ &childev);
1781 }
1782 #endif
1783
1784 if (ev_is_active (&pipe_w))
1785 {
1786 /*ev_ref (EV_A);*/
1787 /*ev_io_stop (EV_A_ &pipe_w);*/
1788
1789 #if EV_USE_EVENTFD
1790 if (evfd >= 0)
1791 close (evfd);
1792 #endif
1793
1794 if (evpipe [0] >= 0)
1795 {
1796 EV_WIN32_CLOSE_FD (evpipe [0]);
1797 EV_WIN32_CLOSE_FD (evpipe [1]);
1798 }
1799 }
1800
1801 #if EV_USE_SIGNALFD
1802 if (ev_is_active (&sigfd_w))
1803 close (sigfd);
1804 #endif
1805
1806 #if EV_USE_INOTIFY
1807 if (fs_fd >= 0)
1808 close (fs_fd);
1809 #endif
1810
1811 if (backend_fd >= 0)
1812 close (backend_fd);
1813
1814 #if EV_USE_IOCP
1815 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1816 #endif
1817 #if EV_USE_PORT
1818 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1819 #endif
1820 #if EV_USE_KQUEUE
1821 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1822 #endif
1823 #if EV_USE_EPOLL
1824 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1825 #endif
1826 #if EV_USE_POLL
1827 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1828 #endif
1829 #if EV_USE_SELECT
1830 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1831 #endif
1832
1833 for (i = NUMPRI; i--; )
1834 {
1835 array_free (pending, [i]);
1836 #if EV_IDLE_ENABLE
1837 array_free (idle, [i]);
1838 #endif
1839 }
1840
1841 ev_free (anfds); anfds = 0; anfdmax = 0;
1842
1843 /* have to use the microsoft-never-gets-it-right macro */
1844 array_free (rfeed, EMPTY);
1845 array_free (fdchange, EMPTY);
1846 array_free (timer, EMPTY);
1847 #if EV_PERIODIC_ENABLE
1848 array_free (periodic, EMPTY);
1849 #endif
1850 #if EV_FORK_ENABLE
1851 array_free (fork, EMPTY);
1852 #endif
1853 #if EV_CLEANUP_ENABLE
1854 array_free (cleanup, EMPTY);
1855 #endif
1856 array_free (prepare, EMPTY);
1857 array_free (check, EMPTY);
1858 #if EV_ASYNC_ENABLE
1859 array_free (async, EMPTY);
1860 #endif
1861
1862 backend = 0;
1863
1864 #if EV_MULTIPLICITY
1865 if (ev_is_default_loop (EV_A))
1866 #endif
1867 ev_default_loop_ptr = 0;
1868 #if EV_MULTIPLICITY
1869 else
1870 ev_free (EV_A);
1871 #endif
1872 }
1873
1874 #if EV_USE_INOTIFY
1875 inline_size void infy_fork (EV_P);
1876 #endif
1877
1878 inline_size void
1879 loop_fork (EV_P)
1880 {
1881 #if EV_USE_PORT
1882 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1883 #endif
1884 #if EV_USE_KQUEUE
1885 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1886 #endif
1887 #if EV_USE_EPOLL
1888 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1889 #endif
1890 #if EV_USE_INOTIFY
1891 infy_fork (EV_A);
1892 #endif
1893
1894 if (ev_is_active (&pipe_w))
1895 {
1896 /* this "locks" the handlers against writing to the pipe */
1897 /* while we modify the fd vars */
1898 sig_pending = 1;
1899 #if EV_ASYNC_ENABLE
1900 async_pending = 1;
1901 #endif
1902
1903 ev_ref (EV_A);
1904 ev_io_stop (EV_A_ &pipe_w);
1905
1906 #if EV_USE_EVENTFD
1907 if (evfd >= 0)
1908 close (evfd);
1909 #endif
1910
1911 if (evpipe [0] >= 0)
1912 {
1913 EV_WIN32_CLOSE_FD (evpipe [0]);
1914 EV_WIN32_CLOSE_FD (evpipe [1]);
1915 }
1916
1917 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1918 evpipe_init (EV_A);
1919 /* now iterate over everything, in case we missed something */
1920 pipecb (EV_A_ &pipe_w, EV_READ);
1921 #endif
1922 }
1923
1924 postfork = 0;
1925 }
1926
1927 #if EV_MULTIPLICITY
1928
1929 struct ev_loop *
1930 ev_loop_new (unsigned int flags)
1931 {
1932 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1933
1934 memset (EV_A, 0, sizeof (struct ev_loop));
1935 loop_init (EV_A_ flags);
1936
1937 if (ev_backend (EV_A))
1938 return EV_A;
1939
1940 ev_free (EV_A);
1941 return 0;
1942 }
1943
1944 #endif /* multiplicity */
1945
1946 #if EV_VERIFY
1947 static void noinline
1948 verify_watcher (EV_P_ W w)
1949 {
1950 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1951
1952 if (w->pending)
1953 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1954 }
1955
1956 static void noinline
1957 verify_heap (EV_P_ ANHE *heap, int N)
1958 {
1959 int i;
1960
1961 for (i = HEAP0; i < N + HEAP0; ++i)
1962 {
1963 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1964 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1965 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1966
1967 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1968 }
1969 }
1970
1971 static void noinline
1972 array_verify (EV_P_ W *ws, int cnt)
1973 {
1974 while (cnt--)
1975 {
1976 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1977 verify_watcher (EV_A_ ws [cnt]);
1978 }
1979 }
1980 #endif
1981
1982 #if EV_FEATURE_API
1983 void
1984 ev_verify (EV_P)
1985 {
1986 #if EV_VERIFY
1987 int i;
1988 WL w;
1989
1990 assert (activecnt >= -1);
1991
1992 assert (fdchangemax >= fdchangecnt);
1993 for (i = 0; i < fdchangecnt; ++i)
1994 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1995
1996 assert (anfdmax >= 0);
1997 for (i = 0; i < anfdmax; ++i)
1998 for (w = anfds [i].head; w; w = w->next)
1999 {
2000 verify_watcher (EV_A_ (W)w);
2001 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2002 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2003 }
2004
2005 assert (timermax >= timercnt);
2006 verify_heap (EV_A_ timers, timercnt);
2007
2008 #if EV_PERIODIC_ENABLE
2009 assert (periodicmax >= periodiccnt);
2010 verify_heap (EV_A_ periodics, periodiccnt);
2011 #endif
2012
2013 for (i = NUMPRI; i--; )
2014 {
2015 assert (pendingmax [i] >= pendingcnt [i]);
2016 #if EV_IDLE_ENABLE
2017 assert (idleall >= 0);
2018 assert (idlemax [i] >= idlecnt [i]);
2019 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2020 #endif
2021 }
2022
2023 #if EV_FORK_ENABLE
2024 assert (forkmax >= forkcnt);
2025 array_verify (EV_A_ (W *)forks, forkcnt);
2026 #endif
2027
2028 #if EV_CLEANUP_ENABLE
2029 assert (cleanupmax >= cleanupcnt);
2030 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2031 #endif
2032
2033 #if EV_ASYNC_ENABLE
2034 assert (asyncmax >= asynccnt);
2035 array_verify (EV_A_ (W *)asyncs, asynccnt);
2036 #endif
2037
2038 #if EV_PREPARE_ENABLE
2039 assert (preparemax >= preparecnt);
2040 array_verify (EV_A_ (W *)prepares, preparecnt);
2041 #endif
2042
2043 #if EV_CHECK_ENABLE
2044 assert (checkmax >= checkcnt);
2045 array_verify (EV_A_ (W *)checks, checkcnt);
2046 #endif
2047
2048 # if 0
2049 #if EV_CHILD_ENABLE
2050 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2051 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2052 #endif
2053 # endif
2054 #endif
2055 }
2056 #endif
2057
2058 #if EV_MULTIPLICITY
2059 struct ev_loop *
2060 #else
2061 int
2062 #endif
2063 ev_default_loop (unsigned int flags)
2064 {
2065 if (!ev_default_loop_ptr)
2066 {
2067 #if EV_MULTIPLICITY
2068 EV_P = ev_default_loop_ptr = &default_loop_struct;
2069 #else
2070 ev_default_loop_ptr = 1;
2071 #endif
2072
2073 loop_init (EV_A_ flags);
2074
2075 if (ev_backend (EV_A))
2076 {
2077 #if EV_CHILD_ENABLE
2078 ev_signal_init (&childev, childcb, SIGCHLD);
2079 ev_set_priority (&childev, EV_MAXPRI);
2080 ev_signal_start (EV_A_ &childev);
2081 ev_unref (EV_A); /* child watcher should not keep loop alive */
2082 #endif
2083 }
2084 else
2085 ev_default_loop_ptr = 0;
2086 }
2087
2088 return ev_default_loop_ptr;
2089 }
2090
2091 void
2092 ev_loop_fork (EV_P)
2093 {
2094 postfork = 1; /* must be in line with ev_default_fork */
2095 }
2096
2097 /*****************************************************************************/
2098
2099 void
2100 ev_invoke (EV_P_ void *w, int revents)
2101 {
2102 EV_CB_INVOKE ((W)w, revents);
2103 }
2104
2105 unsigned int
2106 ev_pending_count (EV_P)
2107 {
2108 int pri;
2109 unsigned int count = 0;
2110
2111 for (pri = NUMPRI; pri--; )
2112 count += pendingcnt [pri];
2113
2114 return count;
2115 }
2116
2117 void noinline
2118 ev_invoke_pending (EV_P)
2119 {
2120 int pri;
2121
2122 for (pri = NUMPRI; pri--; )
2123 while (pendingcnt [pri])
2124 {
2125 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2126
2127 p->w->pending = 0;
2128 EV_CB_INVOKE (p->w, p->events);
2129 EV_FREQUENT_CHECK;
2130 }
2131 }
2132
2133 #if EV_IDLE_ENABLE
2134 /* make idle watchers pending. this handles the "call-idle */
2135 /* only when higher priorities are idle" logic */
2136 inline_size void
2137 idle_reify (EV_P)
2138 {
2139 if (expect_false (idleall))
2140 {
2141 int pri;
2142
2143 for (pri = NUMPRI; pri--; )
2144 {
2145 if (pendingcnt [pri])
2146 break;
2147
2148 if (idlecnt [pri])
2149 {
2150 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2151 break;
2152 }
2153 }
2154 }
2155 }
2156 #endif
2157
2158 /* make timers pending */
2159 inline_size void
2160 timers_reify (EV_P)
2161 {
2162 EV_FREQUENT_CHECK;
2163
2164 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2165 {
2166 do
2167 {
2168 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2169
2170 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2171
2172 /* first reschedule or stop timer */
2173 if (w->repeat)
2174 {
2175 ev_at (w) += w->repeat;
2176 if (ev_at (w) < mn_now)
2177 ev_at (w) = mn_now;
2178
2179 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2180
2181 ANHE_at_cache (timers [HEAP0]);
2182 downheap (timers, timercnt, HEAP0);
2183 }
2184 else
2185 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2186
2187 EV_FREQUENT_CHECK;
2188 feed_reverse (EV_A_ (W)w);
2189 }
2190 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2191
2192 feed_reverse_done (EV_A_ EV_TIMER);
2193 }
2194 }
2195
2196 #if EV_PERIODIC_ENABLE
2197
2198 inline_speed
2199 periodic_recalc (EV_P_ ev_periodic *w)
2200 {
2201 /* TODO: use slow but potentially more correct incremental algo, */
2202 /* also do not rely on ceil */
2203 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2204 }
2205
2206 /* make periodics pending */
2207 inline_size void
2208 periodics_reify (EV_P)
2209 {
2210 EV_FREQUENT_CHECK;
2211
2212 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2213 {
2214 int feed_count = 0;
2215
2216 do
2217 {
2218 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2219
2220 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2221
2222 /* first reschedule or stop timer */
2223 if (w->reschedule_cb)
2224 {
2225 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2226
2227 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2228
2229 ANHE_at_cache (periodics [HEAP0]);
2230 downheap (periodics, periodiccnt, HEAP0);
2231 }
2232 else if (w->interval)
2233 {
2234 periodic_recalc (EV_A_ w);
2235
2236 /* if next trigger time is not sufficiently in the future, put it there */
2237 /* this might happen because of floating point inexactness */
2238 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2239 {
2240 ev_at (w) += w->interval;
2241
2242 /* if interval is unreasonably low we might still have a time in the past */
2243 /* so correct this. this will make the periodic very inexact, but the user */
2244 /* has effectively asked to get triggered more often than possible */
2245 if (ev_at (w) < ev_rt_now)
2246 ev_at (w) = ev_rt_now;
2247 }
2248
2249 ANHE_at_cache (periodics [HEAP0]);
2250 downheap (periodics, periodiccnt, HEAP0);
2251 }
2252 else
2253 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2254
2255 EV_FREQUENT_CHECK;
2256 feed_reverse (EV_A_ (W)w);
2257 }
2258 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2259
2260 feed_reverse_done (EV_A_ EV_PERIODIC);
2261 }
2262 }
2263
2264 /* simply recalculate all periodics */
2265 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2266 static void noinline
2267 periodics_reschedule (EV_P)
2268 {
2269 int i;
2270
2271 /* adjust periodics after time jump */
2272 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2273 {
2274 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2275
2276 if (w->reschedule_cb)
2277 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2278 else if (w->interval)
2279 periodic_recalc (EV_A_ w);
2280
2281 ANHE_at_cache (periodics [i]);
2282 }
2283
2284 reheap (periodics, periodiccnt);
2285 }
2286 #endif
2287
2288 /* adjust all timers by a given offset */
2289 static void noinline
2290 timers_reschedule (EV_P_ ev_tstamp adjust)
2291 {
2292 int i;
2293
2294 for (i = 0; i < timercnt; ++i)
2295 {
2296 ANHE *he = timers + i + HEAP0;
2297 ANHE_w (*he)->at += adjust;
2298 ANHE_at_cache (*he);
2299 }
2300 }
2301
2302 /* fetch new monotonic and realtime times from the kernel */
2303 /* also detect if there was a timejump, and act accordingly */
2304 inline_speed void
2305 time_update (EV_P_ ev_tstamp max_block)
2306 {
2307 #if EV_USE_MONOTONIC
2308 if (expect_true (have_monotonic))
2309 {
2310 int i;
2311 ev_tstamp odiff = rtmn_diff;
2312
2313 mn_now = get_clock ();
2314
2315 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2316 /* interpolate in the meantime */
2317 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2318 {
2319 ev_rt_now = rtmn_diff + mn_now;
2320 return;
2321 }
2322
2323 now_floor = mn_now;
2324 ev_rt_now = ev_time ();
2325
2326 /* loop a few times, before making important decisions.
2327 * on the choice of "4": one iteration isn't enough,
2328 * in case we get preempted during the calls to
2329 * ev_time and get_clock. a second call is almost guaranteed
2330 * to succeed in that case, though. and looping a few more times
2331 * doesn't hurt either as we only do this on time-jumps or
2332 * in the unlikely event of having been preempted here.
2333 */
2334 for (i = 4; --i; )
2335 {
2336 rtmn_diff = ev_rt_now - mn_now;
2337
2338 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2339 return; /* all is well */
2340
2341 ev_rt_now = ev_time ();
2342 mn_now = get_clock ();
2343 now_floor = mn_now;
2344 }
2345
2346 /* no timer adjustment, as the monotonic clock doesn't jump */
2347 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2348 # if EV_PERIODIC_ENABLE
2349 periodics_reschedule (EV_A);
2350 # endif
2351 }
2352 else
2353 #endif
2354 {
2355 ev_rt_now = ev_time ();
2356
2357 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2358 {
2359 /* adjust timers. this is easy, as the offset is the same for all of them */
2360 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2361 #if EV_PERIODIC_ENABLE
2362 periodics_reschedule (EV_A);
2363 #endif
2364 }
2365
2366 mn_now = ev_rt_now;
2367 }
2368 }
2369
2370 void
2371 ev_run (EV_P_ int flags)
2372 {
2373 #if EV_FEATURE_API
2374 ++loop_depth;
2375 #endif
2376
2377 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2378
2379 loop_done = EVBREAK_CANCEL;
2380
2381 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2382
2383 do
2384 {
2385 #if EV_VERIFY >= 2
2386 ev_verify (EV_A);
2387 #endif
2388
2389 #ifndef _WIN32
2390 if (expect_false (curpid)) /* penalise the forking check even more */
2391 if (expect_false (getpid () != curpid))
2392 {
2393 curpid = getpid ();
2394 postfork = 1;
2395 }
2396 #endif
2397
2398 #if EV_FORK_ENABLE
2399 /* we might have forked, so queue fork handlers */
2400 if (expect_false (postfork))
2401 if (forkcnt)
2402 {
2403 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2404 EV_INVOKE_PENDING;
2405 }
2406 #endif
2407
2408 #if EV_PREPARE_ENABLE
2409 /* queue prepare watchers (and execute them) */
2410 if (expect_false (preparecnt))
2411 {
2412 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2413 EV_INVOKE_PENDING;
2414 }
2415 #endif
2416
2417 if (expect_false (loop_done))
2418 break;
2419
2420 /* we might have forked, so reify kernel state if necessary */
2421 if (expect_false (postfork))
2422 loop_fork (EV_A);
2423
2424 /* update fd-related kernel structures */
2425 fd_reify (EV_A);
2426
2427 /* calculate blocking time */
2428 {
2429 ev_tstamp waittime = 0.;
2430 ev_tstamp sleeptime = 0.;
2431
2432 /* remember old timestamp for io_blocktime calculation */
2433 ev_tstamp prev_mn_now = mn_now;
2434
2435 /* update time to cancel out callback processing overhead */
2436 time_update (EV_A_ 1e100);
2437
2438 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt)))
2439 {
2440 waittime = MAX_BLOCKTIME;
2441
2442 if (timercnt)
2443 {
2444 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2445 if (waittime > to) waittime = to;
2446 }
2447
2448 #if EV_PERIODIC_ENABLE
2449 if (periodiccnt)
2450 {
2451 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2452 if (waittime > to) waittime = to;
2453 }
2454 #endif
2455
2456 /* don't let timeouts decrease the waittime below timeout_blocktime */
2457 if (expect_false (waittime < timeout_blocktime))
2458 waittime = timeout_blocktime;
2459
2460 /* extra check because io_blocktime is commonly 0 */
2461 if (expect_false (io_blocktime))
2462 {
2463 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2464
2465 if (sleeptime > waittime - backend_fudge)
2466 sleeptime = waittime - backend_fudge;
2467
2468 if (expect_true (sleeptime > 0.))
2469 {
2470 ev_sleep (sleeptime);
2471 waittime -= sleeptime;
2472 }
2473 }
2474 }
2475
2476 #if EV_FEATURE_API
2477 ++loop_count;
2478 #endif
2479 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2480 backend_poll (EV_A_ waittime);
2481 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2482
2483 /* update ev_rt_now, do magic */
2484 time_update (EV_A_ waittime + sleeptime);
2485 }
2486
2487 /* queue pending timers and reschedule them */
2488 timers_reify (EV_A); /* relative timers called last */
2489 #if EV_PERIODIC_ENABLE
2490 periodics_reify (EV_A); /* absolute timers called first */
2491 #endif
2492
2493 #if EV_IDLE_ENABLE
2494 /* queue idle watchers unless other events are pending */
2495 idle_reify (EV_A);
2496 #endif
2497
2498 #if EV_CHECK_ENABLE
2499 /* queue check watchers, to be executed first */
2500 if (expect_false (checkcnt))
2501 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2502 #endif
2503
2504 EV_INVOKE_PENDING;
2505 }
2506 while (expect_true (
2507 activecnt
2508 && !loop_done
2509 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2510 ));
2511
2512 if (loop_done == EVBREAK_ONE)
2513 loop_done = EVBREAK_CANCEL;
2514
2515 #if EV_FEATURE_API
2516 --loop_depth;
2517 #endif
2518 }
2519
2520 void
2521 ev_break (EV_P_ int how)
2522 {
2523 loop_done = how;
2524 }
2525
2526 void
2527 ev_ref (EV_P)
2528 {
2529 ++activecnt;
2530 }
2531
2532 void
2533 ev_unref (EV_P)
2534 {
2535 --activecnt;
2536 }
2537
2538 void
2539 ev_now_update (EV_P)
2540 {
2541 time_update (EV_A_ 1e100);
2542 }
2543
2544 void
2545 ev_suspend (EV_P)
2546 {
2547 ev_now_update (EV_A);
2548 }
2549
2550 void
2551 ev_resume (EV_P)
2552 {
2553 ev_tstamp mn_prev = mn_now;
2554
2555 ev_now_update (EV_A);
2556 timers_reschedule (EV_A_ mn_now - mn_prev);
2557 #if EV_PERIODIC_ENABLE
2558 /* TODO: really do this? */
2559 periodics_reschedule (EV_A);
2560 #endif
2561 }
2562
2563 /*****************************************************************************/
2564 /* singly-linked list management, used when the expected list length is short */
2565
2566 inline_size void
2567 wlist_add (WL *head, WL elem)
2568 {
2569 elem->next = *head;
2570 *head = elem;
2571 }
2572
2573 inline_size void
2574 wlist_del (WL *head, WL elem)
2575 {
2576 while (*head)
2577 {
2578 if (expect_true (*head == elem))
2579 {
2580 *head = elem->next;
2581 break;
2582 }
2583
2584 head = &(*head)->next;
2585 }
2586 }
2587
2588 /* internal, faster, version of ev_clear_pending */
2589 inline_speed void
2590 clear_pending (EV_P_ W w)
2591 {
2592 if (w->pending)
2593 {
2594 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2595 w->pending = 0;
2596 }
2597 }
2598
2599 int
2600 ev_clear_pending (EV_P_ void *w)
2601 {
2602 W w_ = (W)w;
2603 int pending = w_->pending;
2604
2605 if (expect_true (pending))
2606 {
2607 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2608 p->w = (W)&pending_w;
2609 w_->pending = 0;
2610 return p->events;
2611 }
2612 else
2613 return 0;
2614 }
2615
2616 inline_size void
2617 pri_adjust (EV_P_ W w)
2618 {
2619 int pri = ev_priority (w);
2620 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2621 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2622 ev_set_priority (w, pri);
2623 }
2624
2625 inline_speed void
2626 ev_start (EV_P_ W w, int active)
2627 {
2628 pri_adjust (EV_A_ w);
2629 w->active = active;
2630 ev_ref (EV_A);
2631 }
2632
2633 inline_size void
2634 ev_stop (EV_P_ W w)
2635 {
2636 ev_unref (EV_A);
2637 w->active = 0;
2638 }
2639
2640 /*****************************************************************************/
2641
2642 void noinline
2643 ev_io_start (EV_P_ ev_io *w)
2644 {
2645 int fd = w->fd;
2646
2647 if (expect_false (ev_is_active (w)))
2648 return;
2649
2650 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2651 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2652
2653 EV_FREQUENT_CHECK;
2654
2655 ev_start (EV_A_ (W)w, 1);
2656 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2657 wlist_add (&anfds[fd].head, (WL)w);
2658
2659 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2660 w->events &= ~EV__IOFDSET;
2661
2662 EV_FREQUENT_CHECK;
2663 }
2664
2665 void noinline
2666 ev_io_stop (EV_P_ ev_io *w)
2667 {
2668 clear_pending (EV_A_ (W)w);
2669 if (expect_false (!ev_is_active (w)))
2670 return;
2671
2672 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2673
2674 EV_FREQUENT_CHECK;
2675
2676 wlist_del (&anfds[w->fd].head, (WL)w);
2677 ev_stop (EV_A_ (W)w);
2678
2679 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2680
2681 EV_FREQUENT_CHECK;
2682 }
2683
2684 void noinline
2685 ev_timer_start (EV_P_ ev_timer *w)
2686 {
2687 if (expect_false (ev_is_active (w)))
2688 return;
2689
2690 ev_at (w) += mn_now;
2691
2692 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2693
2694 EV_FREQUENT_CHECK;
2695
2696 ++timercnt;
2697 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2698 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2699 ANHE_w (timers [ev_active (w)]) = (WT)w;
2700 ANHE_at_cache (timers [ev_active (w)]);
2701 upheap (timers, ev_active (w));
2702
2703 EV_FREQUENT_CHECK;
2704
2705 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2706 }
2707
2708 void noinline
2709 ev_timer_stop (EV_P_ ev_timer *w)
2710 {
2711 clear_pending (EV_A_ (W)w);
2712 if (expect_false (!ev_is_active (w)))
2713 return;
2714
2715 EV_FREQUENT_CHECK;
2716
2717 {
2718 int active = ev_active (w);
2719
2720 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2721
2722 --timercnt;
2723
2724 if (expect_true (active < timercnt + HEAP0))
2725 {
2726 timers [active] = timers [timercnt + HEAP0];
2727 adjustheap (timers, timercnt, active);
2728 }
2729 }
2730
2731 ev_at (w) -= mn_now;
2732
2733 ev_stop (EV_A_ (W)w);
2734
2735 EV_FREQUENT_CHECK;
2736 }
2737
2738 void noinline
2739 ev_timer_again (EV_P_ ev_timer *w)
2740 {
2741 EV_FREQUENT_CHECK;
2742
2743 if (ev_is_active (w))
2744 {
2745 if (w->repeat)
2746 {
2747 ev_at (w) = mn_now + w->repeat;
2748 ANHE_at_cache (timers [ev_active (w)]);
2749 adjustheap (timers, timercnt, ev_active (w));
2750 }
2751 else
2752 ev_timer_stop (EV_A_ w);
2753 }
2754 else if (w->repeat)
2755 {
2756 ev_at (w) = w->repeat;
2757 ev_timer_start (EV_A_ w);
2758 }
2759
2760 EV_FREQUENT_CHECK;
2761 }
2762
2763 ev_tstamp
2764 ev_timer_remaining (EV_P_ ev_timer *w)
2765 {
2766 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2767 }
2768
2769 #if EV_PERIODIC_ENABLE
2770 void noinline
2771 ev_periodic_start (EV_P_ ev_periodic *w)
2772 {
2773 if (expect_false (ev_is_active (w)))
2774 return;
2775
2776 if (w->reschedule_cb)
2777 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2778 else if (w->interval)
2779 {
2780 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2781 periodic_recalc (EV_A_ w);
2782 }
2783 else
2784 ev_at (w) = w->offset;
2785
2786 EV_FREQUENT_CHECK;
2787
2788 ++periodiccnt;
2789 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2790 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2791 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2792 ANHE_at_cache (periodics [ev_active (w)]);
2793 upheap (periodics, ev_active (w));
2794
2795 EV_FREQUENT_CHECK;
2796
2797 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2798 }
2799
2800 void noinline
2801 ev_periodic_stop (EV_P_ ev_periodic *w)
2802 {
2803 clear_pending (EV_A_ (W)w);
2804 if (expect_false (!ev_is_active (w)))
2805 return;
2806
2807 EV_FREQUENT_CHECK;
2808
2809 {
2810 int active = ev_active (w);
2811
2812 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2813
2814 --periodiccnt;
2815
2816 if (expect_true (active < periodiccnt + HEAP0))
2817 {
2818 periodics [active] = periodics [periodiccnt + HEAP0];
2819 adjustheap (periodics, periodiccnt, active);
2820 }
2821 }
2822
2823 ev_stop (EV_A_ (W)w);
2824
2825 EV_FREQUENT_CHECK;
2826 }
2827
2828 void noinline
2829 ev_periodic_again (EV_P_ ev_periodic *w)
2830 {
2831 /* TODO: use adjustheap and recalculation */
2832 ev_periodic_stop (EV_A_ w);
2833 ev_periodic_start (EV_A_ w);
2834 }
2835 #endif
2836
2837 #ifndef SA_RESTART
2838 # define SA_RESTART 0
2839 #endif
2840
2841 #if EV_SIGNAL_ENABLE
2842
2843 void noinline
2844 ev_signal_start (EV_P_ ev_signal *w)
2845 {
2846 if (expect_false (ev_is_active (w)))
2847 return;
2848
2849 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2850
2851 #if EV_MULTIPLICITY
2852 assert (("libev: a signal must not be attached to two different loops",
2853 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2854
2855 signals [w->signum - 1].loop = EV_A;
2856 #endif
2857
2858 EV_FREQUENT_CHECK;
2859
2860 #if EV_USE_SIGNALFD
2861 if (sigfd == -2)
2862 {
2863 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2864 if (sigfd < 0 && errno == EINVAL)
2865 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2866
2867 if (sigfd >= 0)
2868 {
2869 fd_intern (sigfd); /* doing it twice will not hurt */
2870
2871 sigemptyset (&sigfd_set);
2872
2873 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2874 ev_set_priority (&sigfd_w, EV_MAXPRI);
2875 ev_io_start (EV_A_ &sigfd_w);
2876 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2877 }
2878 }
2879
2880 if (sigfd >= 0)
2881 {
2882 /* TODO: check .head */
2883 sigaddset (&sigfd_set, w->signum);
2884 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2885
2886 signalfd (sigfd, &sigfd_set, 0);
2887 }
2888 #endif
2889
2890 ev_start (EV_A_ (W)w, 1);
2891 wlist_add (&signals [w->signum - 1].head, (WL)w);
2892
2893 if (!((WL)w)->next)
2894 # if EV_USE_SIGNALFD
2895 if (sigfd < 0) /*TODO*/
2896 # endif
2897 {
2898 # ifdef _WIN32
2899 evpipe_init (EV_A);
2900
2901 signal (w->signum, ev_sighandler);
2902 # else
2903 struct sigaction sa;
2904
2905 evpipe_init (EV_A);
2906
2907 sa.sa_handler = ev_sighandler;
2908 sigfillset (&sa.sa_mask);
2909 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2910 sigaction (w->signum, &sa, 0);
2911
2912 if (origflags & EVFLAG_NOSIGMASK)
2913 {
2914 sigemptyset (&sa.sa_mask);
2915 sigaddset (&sa.sa_mask, w->signum);
2916 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2917 }
2918 #endif
2919 }
2920
2921 EV_FREQUENT_CHECK;
2922 }
2923
2924 void noinline
2925 ev_signal_stop (EV_P_ ev_signal *w)
2926 {
2927 clear_pending (EV_A_ (W)w);
2928 if (expect_false (!ev_is_active (w)))
2929 return;
2930
2931 EV_FREQUENT_CHECK;
2932
2933 wlist_del (&signals [w->signum - 1].head, (WL)w);
2934 ev_stop (EV_A_ (W)w);
2935
2936 if (!signals [w->signum - 1].head)
2937 {
2938 #if EV_MULTIPLICITY
2939 signals [w->signum - 1].loop = 0; /* unattach from signal */
2940 #endif
2941 #if EV_USE_SIGNALFD
2942 if (sigfd >= 0)
2943 {
2944 sigset_t ss;
2945
2946 sigemptyset (&ss);
2947 sigaddset (&ss, w->signum);
2948 sigdelset (&sigfd_set, w->signum);
2949
2950 signalfd (sigfd, &sigfd_set, 0);
2951 sigprocmask (SIG_UNBLOCK, &ss, 0);
2952 }
2953 else
2954 #endif
2955 signal (w->signum, SIG_DFL);
2956 }
2957
2958 EV_FREQUENT_CHECK;
2959 }
2960
2961 #endif
2962
2963 #if EV_CHILD_ENABLE
2964
2965 void
2966 ev_child_start (EV_P_ ev_child *w)
2967 {
2968 #if EV_MULTIPLICITY
2969 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2970 #endif
2971 if (expect_false (ev_is_active (w)))
2972 return;
2973
2974 EV_FREQUENT_CHECK;
2975
2976 ev_start (EV_A_ (W)w, 1);
2977 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2978
2979 EV_FREQUENT_CHECK;
2980 }
2981
2982 void
2983 ev_child_stop (EV_P_ ev_child *w)
2984 {
2985 clear_pending (EV_A_ (W)w);
2986 if (expect_false (!ev_is_active (w)))
2987 return;
2988
2989 EV_FREQUENT_CHECK;
2990
2991 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2992 ev_stop (EV_A_ (W)w);
2993
2994 EV_FREQUENT_CHECK;
2995 }
2996
2997 #endif
2998
2999 #if EV_STAT_ENABLE
3000
3001 # ifdef _WIN32
3002 # undef lstat
3003 # define lstat(a,b) _stati64 (a,b)
3004 # endif
3005
3006 #define DEF_STAT_INTERVAL 5.0074891
3007 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3008 #define MIN_STAT_INTERVAL 0.1074891
3009
3010 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3011
3012 #if EV_USE_INOTIFY
3013
3014 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3015 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3016
3017 static void noinline
3018 infy_add (EV_P_ ev_stat *w)
3019 {
3020 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);
3021
3022 if (w->wd >= 0)
3023 {
3024 struct statfs sfs;
3025
3026 /* now local changes will be tracked by inotify, but remote changes won't */
3027 /* unless the filesystem is known to be local, we therefore still poll */
3028 /* also do poll on <2.6.25, but with normal frequency */
3029
3030 if (!fs_2625)
3031 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3032 else if (!statfs (w->path, &sfs)
3033 && (sfs.f_type == 0x1373 /* devfs */
3034 || sfs.f_type == 0xEF53 /* ext2/3 */
3035 || sfs.f_type == 0x3153464a /* jfs */
3036 || sfs.f_type == 0x52654973 /* reiser3 */
3037 || sfs.f_type == 0x01021994 /* tempfs */
3038 || sfs.f_type == 0x58465342 /* xfs */))
3039 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3040 else
3041 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3042 }
3043 else
3044 {
3045 /* can't use inotify, continue to stat */
3046 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3047
3048 /* if path is not there, monitor some parent directory for speedup hints */
3049 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3050 /* but an efficiency issue only */
3051 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3052 {
3053 char path [4096];
3054 strcpy (path, w->path);
3055
3056 do
3057 {
3058 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3059 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3060
3061 char *pend = strrchr (path, '/');
3062
3063 if (!pend || pend == path)
3064 break;
3065
3066 *pend = 0;
3067 w->wd = inotify_add_watch (fs_fd, path, mask);
3068 }
3069 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3070 }
3071 }
3072
3073 if (w->wd >= 0)
3074 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3075
3076 /* now re-arm timer, if required */
3077 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3078 ev_timer_again (EV_A_ &w->timer);
3079 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3080 }
3081
3082 static void noinline
3083 infy_del (EV_P_ ev_stat *w)
3084 {
3085 int slot;
3086 int wd = w->wd;
3087
3088 if (wd < 0)
3089 return;
3090
3091 w->wd = -2;
3092 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3093 wlist_del (&fs_hash [slot].head, (WL)w);
3094
3095 /* remove this watcher, if others are watching it, they will rearm */
3096 inotify_rm_watch (fs_fd, wd);
3097 }
3098
3099 static void noinline
3100 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3101 {
3102 if (slot < 0)
3103 /* overflow, need to check for all hash slots */
3104 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3105 infy_wd (EV_A_ slot, wd, ev);
3106 else
3107 {
3108 WL w_;
3109
3110 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3111 {
3112 ev_stat *w = (ev_stat *)w_;
3113 w_ = w_->next; /* lets us remove this watcher and all before it */
3114
3115 if (w->wd == wd || wd == -1)
3116 {
3117 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3118 {
3119 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3120 w->wd = -1;
3121 infy_add (EV_A_ w); /* re-add, no matter what */
3122 }
3123
3124 stat_timer_cb (EV_A_ &w->timer, 0);
3125 }
3126 }
3127 }
3128 }
3129
3130 static void
3131 infy_cb (EV_P_ ev_io *w, int revents)
3132 {
3133 char buf [EV_INOTIFY_BUFSIZE];
3134 int ofs;
3135 int len = read (fs_fd, buf, sizeof (buf));
3136
3137 for (ofs = 0; ofs < len; )
3138 {
3139 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3140 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3141 ofs += sizeof (struct inotify_event) + ev->len;
3142 }
3143 }
3144
3145 inline_size void
3146 ev_check_2625 (EV_P)
3147 {
3148 /* kernels < 2.6.25 are borked
3149 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3150 */
3151 if (ev_linux_version () < 0x020619)
3152 return;
3153
3154 fs_2625 = 1;
3155 }
3156
3157 inline_size int
3158 infy_newfd (void)
3159 {
3160 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3161 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3162 if (fd >= 0)
3163 return fd;
3164 #endif
3165 return inotify_init ();
3166 }
3167
3168 inline_size void
3169 infy_init (EV_P)
3170 {
3171 if (fs_fd != -2)
3172 return;
3173
3174 fs_fd = -1;
3175
3176 ev_check_2625 (EV_A);
3177
3178 fs_fd = infy_newfd ();
3179
3180 if (fs_fd >= 0)
3181 {
3182 fd_intern (fs_fd);
3183 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3184 ev_set_priority (&fs_w, EV_MAXPRI);
3185 ev_io_start (EV_A_ &fs_w);
3186 ev_unref (EV_A);
3187 }
3188 }
3189
3190 inline_size void
3191 infy_fork (EV_P)
3192 {
3193 int slot;
3194
3195 if (fs_fd < 0)
3196 return;
3197
3198 ev_ref (EV_A);
3199 ev_io_stop (EV_A_ &fs_w);
3200 close (fs_fd);
3201 fs_fd = infy_newfd ();
3202
3203 if (fs_fd >= 0)
3204 {
3205 fd_intern (fs_fd);
3206 ev_io_set (&fs_w, fs_fd, EV_READ);
3207 ev_io_start (EV_A_ &fs_w);
3208 ev_unref (EV_A);
3209 }
3210
3211 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3212 {
3213 WL w_ = fs_hash [slot].head;
3214 fs_hash [slot].head = 0;
3215
3216 while (w_)
3217 {
3218 ev_stat *w = (ev_stat *)w_;
3219 w_ = w_->next; /* lets us add this watcher */
3220
3221 w->wd = -1;
3222
3223 if (fs_fd >= 0)
3224 infy_add (EV_A_ w); /* re-add, no matter what */
3225 else
3226 {
3227 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3228 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3229 ev_timer_again (EV_A_ &w->timer);
3230 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3231 }
3232 }
3233 }
3234 }
3235
3236 #endif
3237
3238 #ifdef _WIN32
3239 # define EV_LSTAT(p,b) _stati64 (p, b)
3240 #else
3241 # define EV_LSTAT(p,b) lstat (p, b)
3242 #endif
3243
3244 void
3245 ev_stat_stat (EV_P_ ev_stat *w)
3246 {
3247 if (lstat (w->path, &w->attr) < 0)
3248 w->attr.st_nlink = 0;
3249 else if (!w->attr.st_nlink)
3250 w->attr.st_nlink = 1;
3251 }
3252
3253 static void noinline
3254 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3255 {
3256 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3257
3258 ev_statdata prev = w->attr;
3259 ev_stat_stat (EV_A_ w);
3260
3261 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3262 if (
3263 prev.st_dev != w->attr.st_dev
3264 || prev.st_ino != w->attr.st_ino
3265 || prev.st_mode != w->attr.st_mode
3266 || prev.st_nlink != w->attr.st_nlink
3267 || prev.st_uid != w->attr.st_uid
3268 || prev.st_gid != w->attr.st_gid
3269 || prev.st_rdev != w->attr.st_rdev
3270 || prev.st_size != w->attr.st_size
3271 || prev.st_atime != w->attr.st_atime
3272 || prev.st_mtime != w->attr.st_mtime
3273 || prev.st_ctime != w->attr.st_ctime
3274 ) {
3275 /* we only update w->prev on actual differences */
3276 /* in case we test more often than invoke the callback, */
3277 /* to ensure that prev is always different to attr */
3278 w->prev = prev;
3279
3280 #if EV_USE_INOTIFY
3281 if (fs_fd >= 0)
3282 {
3283 infy_del (EV_A_ w);
3284 infy_add (EV_A_ w);
3285 ev_stat_stat (EV_A_ w); /* avoid race... */
3286 }
3287 #endif
3288
3289 ev_feed_event (EV_A_ w, EV_STAT);
3290 }
3291 }
3292
3293 void
3294 ev_stat_start (EV_P_ ev_stat *w)
3295 {
3296 if (expect_false (ev_is_active (w)))
3297 return;
3298
3299 ev_stat_stat (EV_A_ w);
3300
3301 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3302 w->interval = MIN_STAT_INTERVAL;
3303
3304 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3305 ev_set_priority (&w->timer, ev_priority (w));
3306
3307 #if EV_USE_INOTIFY
3308 infy_init (EV_A);
3309
3310 if (fs_fd >= 0)
3311 infy_add (EV_A_ w);
3312 else
3313 #endif
3314 {
3315 ev_timer_again (EV_A_ &w->timer);
3316 ev_unref (EV_A);
3317 }
3318
3319 ev_start (EV_A_ (W)w, 1);
3320
3321 EV_FREQUENT_CHECK;
3322 }
3323
3324 void
3325 ev_stat_stop (EV_P_ ev_stat *w)
3326 {
3327 clear_pending (EV_A_ (W)w);
3328 if (expect_false (!ev_is_active (w)))
3329 return;
3330
3331 EV_FREQUENT_CHECK;
3332
3333 #if EV_USE_INOTIFY
3334 infy_del (EV_A_ w);
3335 #endif
3336
3337 if (ev_is_active (&w->timer))
3338 {
3339 ev_ref (EV_A);
3340 ev_timer_stop (EV_A_ &w->timer);
3341 }
3342
3343 ev_stop (EV_A_ (W)w);
3344
3345 EV_FREQUENT_CHECK;
3346 }
3347 #endif
3348
3349 #if EV_IDLE_ENABLE
3350 void
3351 ev_idle_start (EV_P_ ev_idle *w)
3352 {
3353 if (expect_false (ev_is_active (w)))
3354 return;
3355
3356 pri_adjust (EV_A_ (W)w);
3357
3358 EV_FREQUENT_CHECK;
3359
3360 {
3361 int active = ++idlecnt [ABSPRI (w)];
3362
3363 ++idleall;
3364 ev_start (EV_A_ (W)w, active);
3365
3366 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3367 idles [ABSPRI (w)][active - 1] = w;
3368 }
3369
3370 EV_FREQUENT_CHECK;
3371 }
3372
3373 void
3374 ev_idle_stop (EV_P_ ev_idle *w)
3375 {
3376 clear_pending (EV_A_ (W)w);
3377 if (expect_false (!ev_is_active (w)))
3378 return;
3379
3380 EV_FREQUENT_CHECK;
3381
3382 {
3383 int active = ev_active (w);
3384
3385 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3386 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3387
3388 ev_stop (EV_A_ (W)w);
3389 --idleall;
3390 }
3391
3392 EV_FREQUENT_CHECK;
3393 }
3394 #endif
3395
3396 #if EV_PREPARE_ENABLE
3397 void
3398 ev_prepare_start (EV_P_ ev_prepare *w)
3399 {
3400 if (expect_false (ev_is_active (w)))
3401 return;
3402
3403 EV_FREQUENT_CHECK;
3404
3405 ev_start (EV_A_ (W)w, ++preparecnt);
3406 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3407 prepares [preparecnt - 1] = w;
3408
3409 EV_FREQUENT_CHECK;
3410 }
3411
3412 void
3413 ev_prepare_stop (EV_P_ ev_prepare *w)
3414 {
3415 clear_pending (EV_A_ (W)w);
3416 if (expect_false (!ev_is_active (w)))
3417 return;
3418
3419 EV_FREQUENT_CHECK;
3420
3421 {
3422 int active = ev_active (w);
3423
3424 prepares [active - 1] = prepares [--preparecnt];
3425 ev_active (prepares [active - 1]) = active;
3426 }
3427
3428 ev_stop (EV_A_ (W)w);
3429
3430 EV_FREQUENT_CHECK;
3431 }
3432 #endif
3433
3434 #if EV_CHECK_ENABLE
3435 void
3436 ev_check_start (EV_P_ ev_check *w)
3437 {
3438 if (expect_false (ev_is_active (w)))
3439 return;
3440
3441 EV_FREQUENT_CHECK;
3442
3443 ev_start (EV_A_ (W)w, ++checkcnt);
3444 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3445 checks [checkcnt - 1] = w;
3446
3447 EV_FREQUENT_CHECK;
3448 }
3449
3450 void
3451 ev_check_stop (EV_P_ ev_check *w)
3452 {
3453 clear_pending (EV_A_ (W)w);
3454 if (expect_false (!ev_is_active (w)))
3455 return;
3456
3457 EV_FREQUENT_CHECK;
3458
3459 {
3460 int active = ev_active (w);
3461
3462 checks [active - 1] = checks [--checkcnt];
3463 ev_active (checks [active - 1]) = active;
3464 }
3465
3466 ev_stop (EV_A_ (W)w);
3467
3468 EV_FREQUENT_CHECK;
3469 }
3470 #endif
3471
3472 #if EV_EMBED_ENABLE
3473 void noinline
3474 ev_embed_sweep (EV_P_ ev_embed *w)
3475 {
3476 ev_run (w->other, EVRUN_NOWAIT);
3477 }
3478
3479 static void
3480 embed_io_cb (EV_P_ ev_io *io, int revents)
3481 {
3482 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3483
3484 if (ev_cb (w))
3485 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3486 else
3487 ev_run (w->other, EVRUN_NOWAIT);
3488 }
3489
3490 static void
3491 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3492 {
3493 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3494
3495 {
3496 EV_P = w->other;
3497
3498 while (fdchangecnt)
3499 {
3500 fd_reify (EV_A);
3501 ev_run (EV_A_ EVRUN_NOWAIT);
3502 }
3503 }
3504 }
3505
3506 static void
3507 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3508 {
3509 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3510
3511 ev_embed_stop (EV_A_ w);
3512
3513 {
3514 EV_P = w->other;
3515
3516 ev_loop_fork (EV_A);
3517 ev_run (EV_A_ EVRUN_NOWAIT);
3518 }
3519
3520 ev_embed_start (EV_A_ w);
3521 }
3522
3523 #if 0
3524 static void
3525 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3526 {
3527 ev_idle_stop (EV_A_ idle);
3528 }
3529 #endif
3530
3531 void
3532 ev_embed_start (EV_P_ ev_embed *w)
3533 {
3534 if (expect_false (ev_is_active (w)))
3535 return;
3536
3537 {
3538 EV_P = w->other;
3539 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3540 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3541 }
3542
3543 EV_FREQUENT_CHECK;
3544
3545 ev_set_priority (&w->io, ev_priority (w));
3546 ev_io_start (EV_A_ &w->io);
3547
3548 ev_prepare_init (&w->prepare, embed_prepare_cb);
3549 ev_set_priority (&w->prepare, EV_MINPRI);
3550 ev_prepare_start (EV_A_ &w->prepare);
3551
3552 ev_fork_init (&w->fork, embed_fork_cb);
3553 ev_fork_start (EV_A_ &w->fork);
3554
3555 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3556
3557 ev_start (EV_A_ (W)w, 1);
3558
3559 EV_FREQUENT_CHECK;
3560 }
3561
3562 void
3563 ev_embed_stop (EV_P_ ev_embed *w)
3564 {
3565 clear_pending (EV_A_ (W)w);
3566 if (expect_false (!ev_is_active (w)))
3567 return;
3568
3569 EV_FREQUENT_CHECK;
3570
3571 ev_io_stop (EV_A_ &w->io);
3572 ev_prepare_stop (EV_A_ &w->prepare);
3573 ev_fork_stop (EV_A_ &w->fork);
3574
3575 ev_stop (EV_A_ (W)w);
3576
3577 EV_FREQUENT_CHECK;
3578 }
3579 #endif
3580
3581 #if EV_FORK_ENABLE
3582 void
3583 ev_fork_start (EV_P_ ev_fork *w)
3584 {
3585 if (expect_false (ev_is_active (w)))
3586 return;
3587
3588 EV_FREQUENT_CHECK;
3589
3590 ev_start (EV_A_ (W)w, ++forkcnt);
3591 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3592 forks [forkcnt - 1] = w;
3593
3594 EV_FREQUENT_CHECK;
3595 }
3596
3597 void
3598 ev_fork_stop (EV_P_ ev_fork *w)
3599 {
3600 clear_pending (EV_A_ (W)w);
3601 if (expect_false (!ev_is_active (w)))
3602 return;
3603
3604 EV_FREQUENT_CHECK;
3605
3606 {
3607 int active = ev_active (w);
3608
3609 forks [active - 1] = forks [--forkcnt];
3610 ev_active (forks [active - 1]) = active;
3611 }
3612
3613 ev_stop (EV_A_ (W)w);
3614
3615 EV_FREQUENT_CHECK;
3616 }
3617 #endif
3618
3619 #if EV_CLEANUP_ENABLE
3620 void
3621 ev_cleanup_start (EV_P_ ev_cleanup *w)
3622 {
3623 if (expect_false (ev_is_active (w)))
3624 return;
3625
3626 EV_FREQUENT_CHECK;
3627
3628 ev_start (EV_A_ (W)w, ++cleanupcnt);
3629 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3630 cleanups [cleanupcnt - 1] = w;
3631
3632 /* cleanup watchers should never keep a refcount on the loop */
3633 ev_unref (EV_A);
3634 EV_FREQUENT_CHECK;
3635 }
3636
3637 void
3638 ev_cleanup_stop (EV_P_ ev_cleanup *w)
3639 {
3640 clear_pending (EV_A_ (W)w);
3641 if (expect_false (!ev_is_active (w)))
3642 return;
3643
3644 EV_FREQUENT_CHECK;
3645 ev_ref (EV_A);
3646
3647 {
3648 int active = ev_active (w);
3649
3650 cleanups [active - 1] = cleanups [--cleanupcnt];
3651 ev_active (cleanups [active - 1]) = active;
3652 }
3653
3654 ev_stop (EV_A_ (W)w);
3655
3656 EV_FREQUENT_CHECK;
3657 }
3658 #endif
3659
3660 #if EV_ASYNC_ENABLE
3661 void
3662 ev_async_start (EV_P_ ev_async *w)
3663 {
3664 if (expect_false (ev_is_active (w)))
3665 return;
3666
3667 w->sent = 0;
3668
3669 evpipe_init (EV_A);
3670
3671 EV_FREQUENT_CHECK;
3672
3673 ev_start (EV_A_ (W)w, ++asynccnt);
3674 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3675 asyncs [asynccnt - 1] = w;
3676
3677 EV_FREQUENT_CHECK;
3678 }
3679
3680 void
3681 ev_async_stop (EV_P_ ev_async *w)
3682 {
3683 clear_pending (EV_A_ (W)w);
3684 if (expect_false (!ev_is_active (w)))
3685 return;
3686
3687 EV_FREQUENT_CHECK;
3688
3689 {
3690 int active = ev_active (w);
3691
3692 asyncs [active - 1] = asyncs [--asynccnt];
3693 ev_active (asyncs [active - 1]) = active;
3694 }
3695
3696 ev_stop (EV_A_ (W)w);
3697
3698 EV_FREQUENT_CHECK;
3699 }
3700
3701 void
3702 ev_async_send (EV_P_ ev_async *w)
3703 {
3704 w->sent = 1;
3705 evpipe_write (EV_A_ &async_pending);
3706 }
3707 #endif
3708
3709 /*****************************************************************************/
3710
3711 struct ev_once
3712 {
3713 ev_io io;
3714 ev_timer to;
3715 void (*cb)(int revents, void *arg);
3716 void *arg;
3717 };
3718
3719 static void
3720 once_cb (EV_P_ struct ev_once *once, int revents)
3721 {
3722 void (*cb)(int revents, void *arg) = once->cb;
3723 void *arg = once->arg;
3724
3725 ev_io_stop (EV_A_ &once->io);
3726 ev_timer_stop (EV_A_ &once->to);
3727 ev_free (once);
3728
3729 cb (revents, arg);
3730 }
3731
3732 static void
3733 once_cb_io (EV_P_ ev_io *w, int revents)
3734 {
3735 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3736
3737 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3738 }
3739
3740 static void
3741 once_cb_to (EV_P_ ev_timer *w, int revents)
3742 {
3743 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3744
3745 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3746 }
3747
3748 void
3749 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3750 {
3751 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3752
3753 if (expect_false (!once))
3754 {
3755 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3756 return;
3757 }
3758
3759 once->cb = cb;
3760 once->arg = arg;
3761
3762 ev_init (&once->io, once_cb_io);
3763 if (fd >= 0)
3764 {
3765 ev_io_set (&once->io, fd, events);
3766 ev_io_start (EV_A_ &once->io);
3767 }
3768
3769 ev_init (&once->to, once_cb_to);
3770 if (timeout >= 0.)
3771 {
3772 ev_timer_set (&once->to, timeout, 0.);
3773 ev_timer_start (EV_A_ &once->to);
3774 }
3775 }
3776
3777 /*****************************************************************************/
3778
3779 #if EV_WALK_ENABLE
3780 void
3781 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3782 {
3783 int i, j;
3784 ev_watcher_list *wl, *wn;
3785
3786 if (types & (EV_IO | EV_EMBED))
3787 for (i = 0; i < anfdmax; ++i)
3788 for (wl = anfds [i].head; wl; )
3789 {
3790 wn = wl->next;
3791
3792 #if EV_EMBED_ENABLE
3793 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3794 {
3795 if (types & EV_EMBED)
3796 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3797 }
3798 else
3799 #endif
3800 #if EV_USE_INOTIFY
3801 if (ev_cb ((ev_io *)wl) == infy_cb)
3802 ;
3803 else
3804 #endif
3805 if ((ev_io *)wl != &pipe_w)
3806 if (types & EV_IO)
3807 cb (EV_A_ EV_IO, wl);
3808
3809 wl = wn;
3810 }
3811
3812 if (types & (EV_TIMER | EV_STAT))
3813 for (i = timercnt + HEAP0; i-- > HEAP0; )
3814 #if EV_STAT_ENABLE
3815 /*TODO: timer is not always active*/
3816 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3817 {
3818 if (types & EV_STAT)
3819 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3820 }
3821 else
3822 #endif
3823 if (types & EV_TIMER)
3824 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3825
3826 #if EV_PERIODIC_ENABLE
3827 if (types & EV_PERIODIC)
3828 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3829 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3830 #endif
3831
3832 #if EV_IDLE_ENABLE
3833 if (types & EV_IDLE)
3834 for (j = NUMPRI; i--; )
3835 for (i = idlecnt [j]; i--; )
3836 cb (EV_A_ EV_IDLE, idles [j][i]);
3837 #endif
3838
3839 #if EV_FORK_ENABLE
3840 if (types & EV_FORK)
3841 for (i = forkcnt; i--; )
3842 if (ev_cb (forks [i]) != embed_fork_cb)
3843 cb (EV_A_ EV_FORK, forks [i]);
3844 #endif
3845
3846 #if EV_ASYNC_ENABLE
3847 if (types & EV_ASYNC)
3848 for (i = asynccnt; i--; )
3849 cb (EV_A_ EV_ASYNC, asyncs [i]);
3850 #endif
3851
3852 #if EV_PREPARE_ENABLE
3853 if (types & EV_PREPARE)
3854 for (i = preparecnt; i--; )
3855 # if EV_EMBED_ENABLE
3856 if (ev_cb (prepares [i]) != embed_prepare_cb)
3857 # endif
3858 cb (EV_A_ EV_PREPARE, prepares [i]);
3859 #endif
3860
3861 #if EV_CHECK_ENABLE
3862 if (types & EV_CHECK)
3863 for (i = checkcnt; i--; )
3864 cb (EV_A_ EV_CHECK, checks [i]);
3865 #endif
3866
3867 #if EV_SIGNAL_ENABLE
3868 if (types & EV_SIGNAL)
3869 for (i = 0; i < EV_NSIG - 1; ++i)
3870 for (wl = signals [i].head; wl; )
3871 {
3872 wn = wl->next;
3873 cb (EV_A_ EV_SIGNAL, wl);
3874 wl = wn;
3875 }
3876 #endif
3877
3878 #if EV_CHILD_ENABLE
3879 if (types & EV_CHILD)
3880 for (i = (EV_PID_HASHSIZE); i--; )
3881 for (wl = childs [i]; wl; )
3882 {
3883 wn = wl->next;
3884 cb (EV_A_ EV_CHILD, wl);
3885 wl = wn;
3886 }
3887 #endif
3888 /* EV_STAT 0x00001000 /* stat data changed */
3889 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
3890 }
3891 #endif
3892
3893 #if EV_MULTIPLICITY
3894 #include "ev_wrap.h"
3895 #endif
3896
3897 EV_CPP(})
3898