ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev.c
Revision: 1.371
Committed: Mon Feb 7 21:45:32 2011 UTC (13 years, 5 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.370: +26 -11 lines
Log Message:
*** empty log message ***

File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011 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 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
980 for (i = 0; i < fdchangecnt; ++i)
981 {
982 int fd = fdchanges [i];
983 ANFD *anfd = anfds + fd;
984
985 if (anfd->reify & EV__IOFDSET)
986 {
987 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
988
989 if (handle != anfd->handle)
990 {
991 unsigned long arg;
992
993 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
994
995 /* handle changed, but fd didn't - we need to do it in two steps */
996 backend_modify (EV_A_ fd, anfd->events, 0);
997 anfd->events = 0;
998 anfd->handle = handle;
999 }
1000 }
1001 }
1002 #endif
1003
1004 for (i = 0; i < fdchangecnt; ++i)
1005 {
1006 int fd = fdchanges [i];
1007 ANFD *anfd = anfds + fd;
1008 ev_io *w;
1009
1010 unsigned char o_events = anfd->events;
1011 unsigned char o_reify = anfd->reify;
1012
1013 anfd->reify = 0;
1014
1015 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1016 {
1017 anfd->events = 0;
1018
1019 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1020 anfd->events |= (unsigned char)w->events;
1021
1022 if (o_events != anfd->events)
1023 o_reify = EV__IOFDSET; /* actually |= */
1024 }
1025
1026 if (o_reify & EV__IOFDSET)
1027 backend_modify (EV_A_ fd, o_events, anfd->events);
1028 }
1029
1030 fdchangecnt = 0;
1031 }
1032
1033 /* something about the given fd changed */
1034 inline_size void
1035 fd_change (EV_P_ int fd, int flags)
1036 {
1037 unsigned char reify = anfds [fd].reify;
1038 anfds [fd].reify |= flags;
1039
1040 if (expect_true (!reify))
1041 {
1042 ++fdchangecnt;
1043 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1044 fdchanges [fdchangecnt - 1] = fd;
1045 }
1046 }
1047
1048 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1049 inline_speed void
1050 fd_kill (EV_P_ int fd)
1051 {
1052 ev_io *w;
1053
1054 while ((w = (ev_io *)anfds [fd].head))
1055 {
1056 ev_io_stop (EV_A_ w);
1057 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1058 }
1059 }
1060
1061 /* check whether the given fd is actually valid, for error recovery */
1062 inline_size int
1063 fd_valid (int fd)
1064 {
1065 #ifdef _WIN32
1066 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1067 #else
1068 return fcntl (fd, F_GETFD) != -1;
1069 #endif
1070 }
1071
1072 /* called on EBADF to verify fds */
1073 static void noinline
1074 fd_ebadf (EV_P)
1075 {
1076 int fd;
1077
1078 for (fd = 0; fd < anfdmax; ++fd)
1079 if (anfds [fd].events)
1080 if (!fd_valid (fd) && errno == EBADF)
1081 fd_kill (EV_A_ fd);
1082 }
1083
1084 /* called on ENOMEM in select/poll to kill some fds and retry */
1085 static void noinline
1086 fd_enomem (EV_P)
1087 {
1088 int fd;
1089
1090 for (fd = anfdmax; fd--; )
1091 if (anfds [fd].events)
1092 {
1093 fd_kill (EV_A_ fd);
1094 break;
1095 }
1096 }
1097
1098 /* usually called after fork if backend needs to re-arm all fds from scratch */
1099 static void noinline
1100 fd_rearm_all (EV_P)
1101 {
1102 int fd;
1103
1104 for (fd = 0; fd < anfdmax; ++fd)
1105 if (anfds [fd].events)
1106 {
1107 anfds [fd].events = 0;
1108 anfds [fd].emask = 0;
1109 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1110 }
1111 }
1112
1113 /* used to prepare libev internal fd's */
1114 /* this is not fork-safe */
1115 inline_speed void
1116 fd_intern (int fd)
1117 {
1118 #ifdef _WIN32
1119 unsigned long arg = 1;
1120 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1121 #else
1122 fcntl (fd, F_SETFD, FD_CLOEXEC);
1123 fcntl (fd, F_SETFL, O_NONBLOCK);
1124 #endif
1125 }
1126
1127 /*****************************************************************************/
1128
1129 /*
1130 * the heap functions want a real array index. array index 0 is guaranteed to not
1131 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1132 * the branching factor of the d-tree.
1133 */
1134
1135 /*
1136 * at the moment we allow libev the luxury of two heaps,
1137 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1138 * which is more cache-efficient.
1139 * the difference is about 5% with 50000+ watchers.
1140 */
1141 #if EV_USE_4HEAP
1142
1143 #define DHEAP 4
1144 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1145 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1146 #define UPHEAP_DONE(p,k) ((p) == (k))
1147
1148 /* away from the root */
1149 inline_speed void
1150 downheap (ANHE *heap, int N, int k)
1151 {
1152 ANHE he = heap [k];
1153 ANHE *E = heap + N + HEAP0;
1154
1155 for (;;)
1156 {
1157 ev_tstamp minat;
1158 ANHE *minpos;
1159 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1160
1161 /* find minimum child */
1162 if (expect_true (pos + DHEAP - 1 < E))
1163 {
1164 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1165 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1166 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1167 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1168 }
1169 else if (pos < E)
1170 {
1171 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1172 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1173 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1174 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1175 }
1176 else
1177 break;
1178
1179 if (ANHE_at (he) <= minat)
1180 break;
1181
1182 heap [k] = *minpos;
1183 ev_active (ANHE_w (*minpos)) = k;
1184
1185 k = minpos - heap;
1186 }
1187
1188 heap [k] = he;
1189 ev_active (ANHE_w (he)) = k;
1190 }
1191
1192 #else /* 4HEAP */
1193
1194 #define HEAP0 1
1195 #define HPARENT(k) ((k) >> 1)
1196 #define UPHEAP_DONE(p,k) (!(p))
1197
1198 /* away from the root */
1199 inline_speed void
1200 downheap (ANHE *heap, int N, int k)
1201 {
1202 ANHE he = heap [k];
1203
1204 for (;;)
1205 {
1206 int c = k << 1;
1207
1208 if (c >= N + HEAP0)
1209 break;
1210
1211 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1212 ? 1 : 0;
1213
1214 if (ANHE_at (he) <= ANHE_at (heap [c]))
1215 break;
1216
1217 heap [k] = heap [c];
1218 ev_active (ANHE_w (heap [k])) = k;
1219
1220 k = c;
1221 }
1222
1223 heap [k] = he;
1224 ev_active (ANHE_w (he)) = k;
1225 }
1226 #endif
1227
1228 /* towards the root */
1229 inline_speed void
1230 upheap (ANHE *heap, int k)
1231 {
1232 ANHE he = heap [k];
1233
1234 for (;;)
1235 {
1236 int p = HPARENT (k);
1237
1238 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1239 break;
1240
1241 heap [k] = heap [p];
1242 ev_active (ANHE_w (heap [k])) = k;
1243 k = p;
1244 }
1245
1246 heap [k] = he;
1247 ev_active (ANHE_w (he)) = k;
1248 }
1249
1250 /* move an element suitably so it is in a correct place */
1251 inline_size void
1252 adjustheap (ANHE *heap, int N, int k)
1253 {
1254 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1255 upheap (heap, k);
1256 else
1257 downheap (heap, N, k);
1258 }
1259
1260 /* rebuild the heap: this function is used only once and executed rarely */
1261 inline_size void
1262 reheap (ANHE *heap, int N)
1263 {
1264 int i;
1265
1266 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1267 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1268 for (i = 0; i < N; ++i)
1269 upheap (heap, i + HEAP0);
1270 }
1271
1272 /*****************************************************************************/
1273
1274 /* associate signal watchers to a signal signal */
1275 typedef struct
1276 {
1277 EV_ATOMIC_T pending;
1278 #if EV_MULTIPLICITY
1279 EV_P;
1280 #endif
1281 WL head;
1282 } ANSIG;
1283
1284 static ANSIG signals [EV_NSIG - 1];
1285
1286 /*****************************************************************************/
1287
1288 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1289
1290 static void noinline
1291 evpipe_init (EV_P)
1292 {
1293 if (!ev_is_active (&pipe_w))
1294 {
1295 # if EV_USE_EVENTFD
1296 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1297 if (evfd < 0 && errno == EINVAL)
1298 evfd = eventfd (0, 0);
1299
1300 if (evfd >= 0)
1301 {
1302 evpipe [0] = -1;
1303 fd_intern (evfd); /* doing it twice doesn't hurt */
1304 ev_io_set (&pipe_w, evfd, EV_READ);
1305 }
1306 else
1307 # endif
1308 {
1309 while (pipe (evpipe))
1310 ev_syserr ("(libev) error creating signal/async pipe");
1311
1312 fd_intern (evpipe [0]);
1313 fd_intern (evpipe [1]);
1314 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1315 }
1316
1317 ev_io_start (EV_A_ &pipe_w);
1318 ev_unref (EV_A); /* watcher should not keep loop alive */
1319 }
1320 }
1321
1322 inline_size void
1323 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1324 {
1325 if (!*flag)
1326 {
1327 int old_errno = errno; /* save errno because write might clobber it */
1328 char dummy;
1329
1330 *flag = 1;
1331
1332 #if EV_USE_EVENTFD
1333 if (evfd >= 0)
1334 {
1335 uint64_t counter = 1;
1336 write (evfd, &counter, sizeof (uint64_t));
1337 }
1338 else
1339 #endif
1340 /* win32 people keep sending patches that change this write() to send() */
1341 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1342 /* so when you think this write should be a send instead, please find out */
1343 /* where your send() is from - it's definitely not the microsoft send, and */
1344 /* tell me. thank you. */
1345 write (evpipe [1], &dummy, 1);
1346
1347 errno = old_errno;
1348 }
1349 }
1350
1351 /* called whenever the libev signal pipe */
1352 /* got some events (signal, async) */
1353 static void
1354 pipecb (EV_P_ ev_io *iow, int revents)
1355 {
1356 int i;
1357
1358 #if EV_USE_EVENTFD
1359 if (evfd >= 0)
1360 {
1361 uint64_t counter;
1362 read (evfd, &counter, sizeof (uint64_t));
1363 }
1364 else
1365 #endif
1366 {
1367 char dummy;
1368 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1369 read (evpipe [0], &dummy, 1);
1370 }
1371
1372 #if EV_SIGNAL_ENABLE
1373 if (sig_pending)
1374 {
1375 sig_pending = 0;
1376
1377 for (i = EV_NSIG - 1; i--; )
1378 if (expect_false (signals [i].pending))
1379 ev_feed_signal_event (EV_A_ i + 1);
1380 }
1381 #endif
1382
1383 #if EV_ASYNC_ENABLE
1384 if (async_pending)
1385 {
1386 async_pending = 0;
1387
1388 for (i = asynccnt; i--; )
1389 if (asyncs [i]->sent)
1390 {
1391 asyncs [i]->sent = 0;
1392 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1393 }
1394 }
1395 #endif
1396 }
1397
1398 /*****************************************************************************/
1399
1400 void
1401 ev_feed_signal (int signum)
1402 {
1403 #if EV_MULTIPLICITY
1404 EV_P = signals [signum - 1].loop;
1405
1406 if (!EV_A)
1407 return;
1408 #endif
1409
1410 signals [signum - 1].pending = 1;
1411 evpipe_write (EV_A_ &sig_pending);
1412 }
1413
1414 static void
1415 ev_sighandler (int signum)
1416 {
1417 #ifdef _WIN32
1418 signal (signum, ev_sighandler);
1419 #endif
1420
1421 ev_feed_signal (signum);
1422 }
1423
1424 void noinline
1425 ev_feed_signal_event (EV_P_ int signum)
1426 {
1427 WL w;
1428
1429 if (expect_false (signum <= 0 || signum > EV_NSIG))
1430 return;
1431
1432 --signum;
1433
1434 #if EV_MULTIPLICITY
1435 /* it is permissible to try to feed a signal to the wrong loop */
1436 /* or, likely more useful, feeding a signal nobody is waiting for */
1437
1438 if (expect_false (signals [signum].loop != EV_A))
1439 return;
1440 #endif
1441
1442 signals [signum].pending = 0;
1443
1444 for (w = signals [signum].head; w; w = w->next)
1445 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1446 }
1447
1448 #if EV_USE_SIGNALFD
1449 static void
1450 sigfdcb (EV_P_ ev_io *iow, int revents)
1451 {
1452 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1453
1454 for (;;)
1455 {
1456 ssize_t res = read (sigfd, si, sizeof (si));
1457
1458 /* not ISO-C, as res might be -1, but works with SuS */
1459 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1460 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1461
1462 if (res < (ssize_t)sizeof (si))
1463 break;
1464 }
1465 }
1466 #endif
1467
1468 #endif
1469
1470 /*****************************************************************************/
1471
1472 #if EV_CHILD_ENABLE
1473 static WL childs [EV_PID_HASHSIZE];
1474
1475 static ev_signal childev;
1476
1477 #ifndef WIFCONTINUED
1478 # define WIFCONTINUED(status) 0
1479 #endif
1480
1481 /* handle a single child status event */
1482 inline_speed void
1483 child_reap (EV_P_ int chain, int pid, int status)
1484 {
1485 ev_child *w;
1486 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1487
1488 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1489 {
1490 if ((w->pid == pid || !w->pid)
1491 && (!traced || (w->flags & 1)))
1492 {
1493 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1494 w->rpid = pid;
1495 w->rstatus = status;
1496 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1497 }
1498 }
1499 }
1500
1501 #ifndef WCONTINUED
1502 # define WCONTINUED 0
1503 #endif
1504
1505 /* called on sigchld etc., calls waitpid */
1506 static void
1507 childcb (EV_P_ ev_signal *sw, int revents)
1508 {
1509 int pid, status;
1510
1511 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1512 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1513 if (!WCONTINUED
1514 || errno != EINVAL
1515 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1516 return;
1517
1518 /* make sure we are called again until all children have been reaped */
1519 /* we need to do it this way so that the callback gets called before we continue */
1520 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1521
1522 child_reap (EV_A_ pid, pid, status);
1523 if ((EV_PID_HASHSIZE) > 1)
1524 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1525 }
1526
1527 #endif
1528
1529 /*****************************************************************************/
1530
1531 #if EV_USE_IOCP
1532 # include "ev_iocp.c"
1533 #endif
1534 #if EV_USE_PORT
1535 # include "ev_port.c"
1536 #endif
1537 #if EV_USE_KQUEUE
1538 # include "ev_kqueue.c"
1539 #endif
1540 #if EV_USE_EPOLL
1541 # include "ev_epoll.c"
1542 #endif
1543 #if EV_USE_POLL
1544 # include "ev_poll.c"
1545 #endif
1546 #if EV_USE_SELECT
1547 # include "ev_select.c"
1548 #endif
1549
1550 int
1551 ev_version_major (void)
1552 {
1553 return EV_VERSION_MAJOR;
1554 }
1555
1556 int
1557 ev_version_minor (void)
1558 {
1559 return EV_VERSION_MINOR;
1560 }
1561
1562 /* return true if we are running with elevated privileges and should ignore env variables */
1563 int inline_size
1564 enable_secure (void)
1565 {
1566 #ifdef _WIN32
1567 return 0;
1568 #else
1569 return getuid () != geteuid ()
1570 || getgid () != getegid ();
1571 #endif
1572 }
1573
1574 unsigned int
1575 ev_supported_backends (void)
1576 {
1577 unsigned int flags = 0;
1578
1579 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1580 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1581 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1582 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1583 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1584
1585 return flags;
1586 }
1587
1588 unsigned int
1589 ev_recommended_backends (void)
1590 {
1591 unsigned int flags = ev_supported_backends ();
1592
1593 #ifndef __NetBSD__
1594 /* kqueue is borked on everything but netbsd apparently */
1595 /* it usually doesn't work correctly on anything but sockets and pipes */
1596 flags &= ~EVBACKEND_KQUEUE;
1597 #endif
1598 #ifdef __APPLE__
1599 /* only select works correctly on that "unix-certified" platform */
1600 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1601 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1602 #endif
1603 #ifdef __FreeBSD__
1604 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1605 #endif
1606
1607 return flags;
1608 }
1609
1610 unsigned int
1611 ev_embeddable_backends (void)
1612 {
1613 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1614
1615 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1616 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1617 flags &= ~EVBACKEND_EPOLL;
1618
1619 return flags;
1620 }
1621
1622 unsigned int
1623 ev_backend (EV_P)
1624 {
1625 return backend;
1626 }
1627
1628 #if EV_FEATURE_API
1629 unsigned int
1630 ev_iteration (EV_P)
1631 {
1632 return loop_count;
1633 }
1634
1635 unsigned int
1636 ev_depth (EV_P)
1637 {
1638 return loop_depth;
1639 }
1640
1641 void
1642 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1643 {
1644 io_blocktime = interval;
1645 }
1646
1647 void
1648 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1649 {
1650 timeout_blocktime = interval;
1651 }
1652
1653 void
1654 ev_set_userdata (EV_P_ void *data)
1655 {
1656 userdata = data;
1657 }
1658
1659 void *
1660 ev_userdata (EV_P)
1661 {
1662 return userdata;
1663 }
1664
1665 void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1666 {
1667 invoke_cb = invoke_pending_cb;
1668 }
1669
1670 void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1671 {
1672 release_cb = release;
1673 acquire_cb = acquire;
1674 }
1675 #endif
1676
1677 /* initialise a loop structure, must be zero-initialised */
1678 static void noinline
1679 loop_init (EV_P_ unsigned int flags)
1680 {
1681 if (!backend)
1682 {
1683 origflags = flags;
1684
1685 #if EV_USE_REALTIME
1686 if (!have_realtime)
1687 {
1688 struct timespec ts;
1689
1690 if (!clock_gettime (CLOCK_REALTIME, &ts))
1691 have_realtime = 1;
1692 }
1693 #endif
1694
1695 #if EV_USE_MONOTONIC
1696 if (!have_monotonic)
1697 {
1698 struct timespec ts;
1699
1700 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1701 have_monotonic = 1;
1702 }
1703 #endif
1704
1705 /* pid check not overridable via env */
1706 #ifndef _WIN32
1707 if (flags & EVFLAG_FORKCHECK)
1708 curpid = getpid ();
1709 #endif
1710
1711 if (!(flags & EVFLAG_NOENV)
1712 && !enable_secure ()
1713 && getenv ("LIBEV_FLAGS"))
1714 flags = atoi (getenv ("LIBEV_FLAGS"));
1715
1716 ev_rt_now = ev_time ();
1717 mn_now = get_clock ();
1718 now_floor = mn_now;
1719 rtmn_diff = ev_rt_now - mn_now;
1720 #if EV_FEATURE_API
1721 invoke_cb = ev_invoke_pending;
1722 #endif
1723
1724 io_blocktime = 0.;
1725 timeout_blocktime = 0.;
1726 backend = 0;
1727 backend_fd = -1;
1728 sig_pending = 0;
1729 #if EV_ASYNC_ENABLE
1730 async_pending = 0;
1731 #endif
1732 #if EV_USE_INOTIFY
1733 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1734 #endif
1735 #if EV_USE_SIGNALFD
1736 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1737 #endif
1738
1739 if (!(flags & EVBACKEND_MASK))
1740 flags |= ev_recommended_backends ();
1741
1742 #if EV_USE_IOCP
1743 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1744 #endif
1745 #if EV_USE_PORT
1746 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1747 #endif
1748 #if EV_USE_KQUEUE
1749 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1750 #endif
1751 #if EV_USE_EPOLL
1752 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1753 #endif
1754 #if EV_USE_POLL
1755 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1756 #endif
1757 #if EV_USE_SELECT
1758 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1759 #endif
1760
1761 ev_prepare_init (&pending_w, pendingcb);
1762
1763 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1764 ev_init (&pipe_w, pipecb);
1765 ev_set_priority (&pipe_w, EV_MAXPRI);
1766 #endif
1767 }
1768 }
1769
1770 /* free up a loop structure */
1771 void
1772 ev_loop_destroy (EV_P)
1773 {
1774 int i;
1775
1776 #if EV_MULTIPLICITY
1777 /* mimic free (0) */
1778 if (!EV_A)
1779 return;
1780 #endif
1781
1782 #if EV_CLEANUP_ENABLE
1783 /* queue cleanup watchers (and execute them) */
1784 if (expect_false (cleanupcnt))
1785 {
1786 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1787 EV_INVOKE_PENDING;
1788 }
1789 #endif
1790
1791 #if EV_CHILD_ENABLE
1792 if (ev_is_active (&childev))
1793 {
1794 ev_ref (EV_A); /* child watcher */
1795 ev_signal_stop (EV_A_ &childev);
1796 }
1797 #endif
1798
1799 if (ev_is_active (&pipe_w))
1800 {
1801 /*ev_ref (EV_A);*/
1802 /*ev_io_stop (EV_A_ &pipe_w);*/
1803
1804 #if EV_USE_EVENTFD
1805 if (evfd >= 0)
1806 close (evfd);
1807 #endif
1808
1809 if (evpipe [0] >= 0)
1810 {
1811 EV_WIN32_CLOSE_FD (evpipe [0]);
1812 EV_WIN32_CLOSE_FD (evpipe [1]);
1813 }
1814 }
1815
1816 #if EV_USE_SIGNALFD
1817 if (ev_is_active (&sigfd_w))
1818 close (sigfd);
1819 #endif
1820
1821 #if EV_USE_INOTIFY
1822 if (fs_fd >= 0)
1823 close (fs_fd);
1824 #endif
1825
1826 if (backend_fd >= 0)
1827 close (backend_fd);
1828
1829 #if EV_USE_IOCP
1830 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1831 #endif
1832 #if EV_USE_PORT
1833 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1834 #endif
1835 #if EV_USE_KQUEUE
1836 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1837 #endif
1838 #if EV_USE_EPOLL
1839 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1840 #endif
1841 #if EV_USE_POLL
1842 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1843 #endif
1844 #if EV_USE_SELECT
1845 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1846 #endif
1847
1848 for (i = NUMPRI; i--; )
1849 {
1850 array_free (pending, [i]);
1851 #if EV_IDLE_ENABLE
1852 array_free (idle, [i]);
1853 #endif
1854 }
1855
1856 ev_free (anfds); anfds = 0; anfdmax = 0;
1857
1858 /* have to use the microsoft-never-gets-it-right macro */
1859 array_free (rfeed, EMPTY);
1860 array_free (fdchange, EMPTY);
1861 array_free (timer, EMPTY);
1862 #if EV_PERIODIC_ENABLE
1863 array_free (periodic, EMPTY);
1864 #endif
1865 #if EV_FORK_ENABLE
1866 array_free (fork, EMPTY);
1867 #endif
1868 #if EV_CLEANUP_ENABLE
1869 array_free (cleanup, EMPTY);
1870 #endif
1871 array_free (prepare, EMPTY);
1872 array_free (check, EMPTY);
1873 #if EV_ASYNC_ENABLE
1874 array_free (async, EMPTY);
1875 #endif
1876
1877 backend = 0;
1878
1879 #if EV_MULTIPLICITY
1880 if (ev_is_default_loop (EV_A))
1881 #endif
1882 ev_default_loop_ptr = 0;
1883 #if EV_MULTIPLICITY
1884 else
1885 ev_free (EV_A);
1886 #endif
1887 }
1888
1889 #if EV_USE_INOTIFY
1890 inline_size void infy_fork (EV_P);
1891 #endif
1892
1893 inline_size void
1894 loop_fork (EV_P)
1895 {
1896 #if EV_USE_PORT
1897 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1898 #endif
1899 #if EV_USE_KQUEUE
1900 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1901 #endif
1902 #if EV_USE_EPOLL
1903 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1904 #endif
1905 #if EV_USE_INOTIFY
1906 infy_fork (EV_A);
1907 #endif
1908
1909 if (ev_is_active (&pipe_w))
1910 {
1911 /* this "locks" the handlers against writing to the pipe */
1912 /* while we modify the fd vars */
1913 sig_pending = 1;
1914 #if EV_ASYNC_ENABLE
1915 async_pending = 1;
1916 #endif
1917
1918 ev_ref (EV_A);
1919 ev_io_stop (EV_A_ &pipe_w);
1920
1921 #if EV_USE_EVENTFD
1922 if (evfd >= 0)
1923 close (evfd);
1924 #endif
1925
1926 if (evpipe [0] >= 0)
1927 {
1928 EV_WIN32_CLOSE_FD (evpipe [0]);
1929 EV_WIN32_CLOSE_FD (evpipe [1]);
1930 }
1931
1932 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1933 evpipe_init (EV_A);
1934 /* now iterate over everything, in case we missed something */
1935 pipecb (EV_A_ &pipe_w, EV_READ);
1936 #endif
1937 }
1938
1939 postfork = 0;
1940 }
1941
1942 #if EV_MULTIPLICITY
1943
1944 struct ev_loop *
1945 ev_loop_new (unsigned int flags)
1946 {
1947 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1948
1949 memset (EV_A, 0, sizeof (struct ev_loop));
1950 loop_init (EV_A_ flags);
1951
1952 if (ev_backend (EV_A))
1953 return EV_A;
1954
1955 ev_free (EV_A);
1956 return 0;
1957 }
1958
1959 #endif /* multiplicity */
1960
1961 #if EV_VERIFY
1962 static void noinline
1963 verify_watcher (EV_P_ W w)
1964 {
1965 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1966
1967 if (w->pending)
1968 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1969 }
1970
1971 static void noinline
1972 verify_heap (EV_P_ ANHE *heap, int N)
1973 {
1974 int i;
1975
1976 for (i = HEAP0; i < N + HEAP0; ++i)
1977 {
1978 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1979 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1980 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1981
1982 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1983 }
1984 }
1985
1986 static void noinline
1987 array_verify (EV_P_ W *ws, int cnt)
1988 {
1989 while (cnt--)
1990 {
1991 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1992 verify_watcher (EV_A_ ws [cnt]);
1993 }
1994 }
1995 #endif
1996
1997 #if EV_FEATURE_API
1998 void
1999 ev_verify (EV_P)
2000 {
2001 #if EV_VERIFY
2002 int i;
2003 WL w;
2004
2005 assert (activecnt >= -1);
2006
2007 assert (fdchangemax >= fdchangecnt);
2008 for (i = 0; i < fdchangecnt; ++i)
2009 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2010
2011 assert (anfdmax >= 0);
2012 for (i = 0; i < anfdmax; ++i)
2013 for (w = anfds [i].head; w; w = w->next)
2014 {
2015 verify_watcher (EV_A_ (W)w);
2016 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2017 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2018 }
2019
2020 assert (timermax >= timercnt);
2021 verify_heap (EV_A_ timers, timercnt);
2022
2023 #if EV_PERIODIC_ENABLE
2024 assert (periodicmax >= periodiccnt);
2025 verify_heap (EV_A_ periodics, periodiccnt);
2026 #endif
2027
2028 for (i = NUMPRI; i--; )
2029 {
2030 assert (pendingmax [i] >= pendingcnt [i]);
2031 #if EV_IDLE_ENABLE
2032 assert (idleall >= 0);
2033 assert (idlemax [i] >= idlecnt [i]);
2034 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2035 #endif
2036 }
2037
2038 #if EV_FORK_ENABLE
2039 assert (forkmax >= forkcnt);
2040 array_verify (EV_A_ (W *)forks, forkcnt);
2041 #endif
2042
2043 #if EV_CLEANUP_ENABLE
2044 assert (cleanupmax >= cleanupcnt);
2045 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2046 #endif
2047
2048 #if EV_ASYNC_ENABLE
2049 assert (asyncmax >= asynccnt);
2050 array_verify (EV_A_ (W *)asyncs, asynccnt);
2051 #endif
2052
2053 #if EV_PREPARE_ENABLE
2054 assert (preparemax >= preparecnt);
2055 array_verify (EV_A_ (W *)prepares, preparecnt);
2056 #endif
2057
2058 #if EV_CHECK_ENABLE
2059 assert (checkmax >= checkcnt);
2060 array_verify (EV_A_ (W *)checks, checkcnt);
2061 #endif
2062
2063 # if 0
2064 #if EV_CHILD_ENABLE
2065 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2066 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2067 #endif
2068 # endif
2069 #endif
2070 }
2071 #endif
2072
2073 #if EV_MULTIPLICITY
2074 struct ev_loop *
2075 #else
2076 int
2077 #endif
2078 ev_default_loop (unsigned int flags)
2079 {
2080 if (!ev_default_loop_ptr)
2081 {
2082 #if EV_MULTIPLICITY
2083 EV_P = ev_default_loop_ptr = &default_loop_struct;
2084 #else
2085 ev_default_loop_ptr = 1;
2086 #endif
2087
2088 loop_init (EV_A_ flags);
2089
2090 if (ev_backend (EV_A))
2091 {
2092 #if EV_CHILD_ENABLE
2093 ev_signal_init (&childev, childcb, SIGCHLD);
2094 ev_set_priority (&childev, EV_MAXPRI);
2095 ev_signal_start (EV_A_ &childev);
2096 ev_unref (EV_A); /* child watcher should not keep loop alive */
2097 #endif
2098 }
2099 else
2100 ev_default_loop_ptr = 0;
2101 }
2102
2103 return ev_default_loop_ptr;
2104 }
2105
2106 void
2107 ev_loop_fork (EV_P)
2108 {
2109 postfork = 1; /* must be in line with ev_default_fork */
2110 }
2111
2112 /*****************************************************************************/
2113
2114 void
2115 ev_invoke (EV_P_ void *w, int revents)
2116 {
2117 EV_CB_INVOKE ((W)w, revents);
2118 }
2119
2120 unsigned int
2121 ev_pending_count (EV_P)
2122 {
2123 int pri;
2124 unsigned int count = 0;
2125
2126 for (pri = NUMPRI; pri--; )
2127 count += pendingcnt [pri];
2128
2129 return count;
2130 }
2131
2132 void noinline
2133 ev_invoke_pending (EV_P)
2134 {
2135 int pri;
2136
2137 for (pri = NUMPRI; pri--; )
2138 while (pendingcnt [pri])
2139 {
2140 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2141
2142 p->w->pending = 0;
2143 EV_CB_INVOKE (p->w, p->events);
2144 EV_FREQUENT_CHECK;
2145 }
2146 }
2147
2148 #if EV_IDLE_ENABLE
2149 /* make idle watchers pending. this handles the "call-idle */
2150 /* only when higher priorities are idle" logic */
2151 inline_size void
2152 idle_reify (EV_P)
2153 {
2154 if (expect_false (idleall))
2155 {
2156 int pri;
2157
2158 for (pri = NUMPRI; pri--; )
2159 {
2160 if (pendingcnt [pri])
2161 break;
2162
2163 if (idlecnt [pri])
2164 {
2165 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2166 break;
2167 }
2168 }
2169 }
2170 }
2171 #endif
2172
2173 /* make timers pending */
2174 inline_size void
2175 timers_reify (EV_P)
2176 {
2177 EV_FREQUENT_CHECK;
2178
2179 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2180 {
2181 do
2182 {
2183 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2184
2185 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2186
2187 /* first reschedule or stop timer */
2188 if (w->repeat)
2189 {
2190 ev_at (w) += w->repeat;
2191 if (ev_at (w) < mn_now)
2192 ev_at (w) = mn_now;
2193
2194 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2195
2196 ANHE_at_cache (timers [HEAP0]);
2197 downheap (timers, timercnt, HEAP0);
2198 }
2199 else
2200 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2201
2202 EV_FREQUENT_CHECK;
2203 feed_reverse (EV_A_ (W)w);
2204 }
2205 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2206
2207 feed_reverse_done (EV_A_ EV_TIMER);
2208 }
2209 }
2210
2211 #if EV_PERIODIC_ENABLE
2212
2213 inline_speed void
2214 periodic_recalc (EV_P_ ev_periodic *w)
2215 {
2216 /* TODO: use slow but potentially more correct incremental algo, */
2217 /* also do not rely on ceil */
2218 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2219 }
2220
2221 /* make periodics pending */
2222 inline_size void
2223 periodics_reify (EV_P)
2224 {
2225 EV_FREQUENT_CHECK;
2226
2227 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2228 {
2229 int feed_count = 0;
2230
2231 do
2232 {
2233 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2234
2235 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2236
2237 /* first reschedule or stop timer */
2238 if (w->reschedule_cb)
2239 {
2240 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2241
2242 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2243
2244 ANHE_at_cache (periodics [HEAP0]);
2245 downheap (periodics, periodiccnt, HEAP0);
2246 }
2247 else if (w->interval)
2248 {
2249 periodic_recalc (EV_A_ w);
2250
2251 /* if next trigger time is not sufficiently in the future, put it there */
2252 /* this might happen because of floating point inexactness */
2253 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2254 {
2255 ev_at (w) += w->interval;
2256
2257 /* if interval is unreasonably low we might still have a time in the past */
2258 /* so correct this. this will make the periodic very inexact, but the user */
2259 /* has effectively asked to get triggered more often than possible */
2260 if (ev_at (w) < ev_rt_now)
2261 ev_at (w) = ev_rt_now;
2262 }
2263
2264 ANHE_at_cache (periodics [HEAP0]);
2265 downheap (periodics, periodiccnt, HEAP0);
2266 }
2267 else
2268 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2269
2270 EV_FREQUENT_CHECK;
2271 feed_reverse (EV_A_ (W)w);
2272 }
2273 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2274
2275 feed_reverse_done (EV_A_ EV_PERIODIC);
2276 }
2277 }
2278
2279 /* simply recalculate all periodics */
2280 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2281 static void noinline
2282 periodics_reschedule (EV_P)
2283 {
2284 int i;
2285
2286 /* adjust periodics after time jump */
2287 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2288 {
2289 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2290
2291 if (w->reschedule_cb)
2292 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2293 else if (w->interval)
2294 periodic_recalc (EV_A_ w);
2295
2296 ANHE_at_cache (periodics [i]);
2297 }
2298
2299 reheap (periodics, periodiccnt);
2300 }
2301 #endif
2302
2303 /* adjust all timers by a given offset */
2304 static void noinline
2305 timers_reschedule (EV_P_ ev_tstamp adjust)
2306 {
2307 int i;
2308
2309 for (i = 0; i < timercnt; ++i)
2310 {
2311 ANHE *he = timers + i + HEAP0;
2312 ANHE_w (*he)->at += adjust;
2313 ANHE_at_cache (*he);
2314 }
2315 }
2316
2317 /* fetch new monotonic and realtime times from the kernel */
2318 /* also detect if there was a timejump, and act accordingly */
2319 inline_speed void
2320 time_update (EV_P_ ev_tstamp max_block)
2321 {
2322 #if EV_USE_MONOTONIC
2323 if (expect_true (have_monotonic))
2324 {
2325 int i;
2326 ev_tstamp odiff = rtmn_diff;
2327
2328 mn_now = get_clock ();
2329
2330 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2331 /* interpolate in the meantime */
2332 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2333 {
2334 ev_rt_now = rtmn_diff + mn_now;
2335 return;
2336 }
2337
2338 now_floor = mn_now;
2339 ev_rt_now = ev_time ();
2340
2341 /* loop a few times, before making important decisions.
2342 * on the choice of "4": one iteration isn't enough,
2343 * in case we get preempted during the calls to
2344 * ev_time and get_clock. a second call is almost guaranteed
2345 * to succeed in that case, though. and looping a few more times
2346 * doesn't hurt either as we only do this on time-jumps or
2347 * in the unlikely event of having been preempted here.
2348 */
2349 for (i = 4; --i; )
2350 {
2351 rtmn_diff = ev_rt_now - mn_now;
2352
2353 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2354 return; /* all is well */
2355
2356 ev_rt_now = ev_time ();
2357 mn_now = get_clock ();
2358 now_floor = mn_now;
2359 }
2360
2361 /* no timer adjustment, as the monotonic clock doesn't jump */
2362 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2363 # if EV_PERIODIC_ENABLE
2364 periodics_reschedule (EV_A);
2365 # endif
2366 }
2367 else
2368 #endif
2369 {
2370 ev_rt_now = ev_time ();
2371
2372 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2373 {
2374 /* adjust timers. this is easy, as the offset is the same for all of them */
2375 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2376 #if EV_PERIODIC_ENABLE
2377 periodics_reschedule (EV_A);
2378 #endif
2379 }
2380
2381 mn_now = ev_rt_now;
2382 }
2383 }
2384
2385 void
2386 ev_run (EV_P_ int flags)
2387 {
2388 #if EV_FEATURE_API
2389 ++loop_depth;
2390 #endif
2391
2392 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2393
2394 loop_done = EVBREAK_CANCEL;
2395
2396 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2397
2398 do
2399 {
2400 #if EV_VERIFY >= 2
2401 ev_verify (EV_A);
2402 #endif
2403
2404 #ifndef _WIN32
2405 if (expect_false (curpid)) /* penalise the forking check even more */
2406 if (expect_false (getpid () != curpid))
2407 {
2408 curpid = getpid ();
2409 postfork = 1;
2410 }
2411 #endif
2412
2413 #if EV_FORK_ENABLE
2414 /* we might have forked, so queue fork handlers */
2415 if (expect_false (postfork))
2416 if (forkcnt)
2417 {
2418 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2419 EV_INVOKE_PENDING;
2420 }
2421 #endif
2422
2423 #if EV_PREPARE_ENABLE
2424 /* queue prepare watchers (and execute them) */
2425 if (expect_false (preparecnt))
2426 {
2427 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2428 EV_INVOKE_PENDING;
2429 }
2430 #endif
2431
2432 if (expect_false (loop_done))
2433 break;
2434
2435 /* we might have forked, so reify kernel state if necessary */
2436 if (expect_false (postfork))
2437 loop_fork (EV_A);
2438
2439 /* update fd-related kernel structures */
2440 fd_reify (EV_A);
2441
2442 /* calculate blocking time */
2443 {
2444 ev_tstamp waittime = 0.;
2445 ev_tstamp sleeptime = 0.;
2446
2447 /* remember old timestamp for io_blocktime calculation */
2448 ev_tstamp prev_mn_now = mn_now;
2449
2450 /* update time to cancel out callback processing overhead */
2451 time_update (EV_A_ 1e100);
2452
2453 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt)))
2454 {
2455 waittime = MAX_BLOCKTIME;
2456
2457 if (timercnt)
2458 {
2459 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2460 if (waittime > to) waittime = to;
2461 }
2462
2463 #if EV_PERIODIC_ENABLE
2464 if (periodiccnt)
2465 {
2466 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2467 if (waittime > to) waittime = to;
2468 }
2469 #endif
2470
2471 /* don't let timeouts decrease the waittime below timeout_blocktime */
2472 if (expect_false (waittime < timeout_blocktime))
2473 waittime = timeout_blocktime;
2474
2475 /* extra check because io_blocktime is commonly 0 */
2476 if (expect_false (io_blocktime))
2477 {
2478 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2479
2480 if (sleeptime > waittime - backend_fudge)
2481 sleeptime = waittime - backend_fudge;
2482
2483 if (expect_true (sleeptime > 0.))
2484 {
2485 ev_sleep (sleeptime);
2486 waittime -= sleeptime;
2487 }
2488 }
2489 }
2490
2491 #if EV_FEATURE_API
2492 ++loop_count;
2493 #endif
2494 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2495 backend_poll (EV_A_ waittime);
2496 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2497
2498 /* update ev_rt_now, do magic */
2499 time_update (EV_A_ waittime + sleeptime);
2500 }
2501
2502 /* queue pending timers and reschedule them */
2503 timers_reify (EV_A); /* relative timers called last */
2504 #if EV_PERIODIC_ENABLE
2505 periodics_reify (EV_A); /* absolute timers called first */
2506 #endif
2507
2508 #if EV_IDLE_ENABLE
2509 /* queue idle watchers unless other events are pending */
2510 idle_reify (EV_A);
2511 #endif
2512
2513 #if EV_CHECK_ENABLE
2514 /* queue check watchers, to be executed first */
2515 if (expect_false (checkcnt))
2516 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2517 #endif
2518
2519 EV_INVOKE_PENDING;
2520 }
2521 while (expect_true (
2522 activecnt
2523 && !loop_done
2524 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2525 ));
2526
2527 if (loop_done == EVBREAK_ONE)
2528 loop_done = EVBREAK_CANCEL;
2529
2530 #if EV_FEATURE_API
2531 --loop_depth;
2532 #endif
2533 }
2534
2535 void
2536 ev_break (EV_P_ int how)
2537 {
2538 loop_done = how;
2539 }
2540
2541 void
2542 ev_ref (EV_P)
2543 {
2544 ++activecnt;
2545 }
2546
2547 void
2548 ev_unref (EV_P)
2549 {
2550 --activecnt;
2551 }
2552
2553 void
2554 ev_now_update (EV_P)
2555 {
2556 time_update (EV_A_ 1e100);
2557 }
2558
2559 void
2560 ev_suspend (EV_P)
2561 {
2562 ev_now_update (EV_A);
2563 }
2564
2565 void
2566 ev_resume (EV_P)
2567 {
2568 ev_tstamp mn_prev = mn_now;
2569
2570 ev_now_update (EV_A);
2571 timers_reschedule (EV_A_ mn_now - mn_prev);
2572 #if EV_PERIODIC_ENABLE
2573 /* TODO: really do this? */
2574 periodics_reschedule (EV_A);
2575 #endif
2576 }
2577
2578 /*****************************************************************************/
2579 /* singly-linked list management, used when the expected list length is short */
2580
2581 inline_size void
2582 wlist_add (WL *head, WL elem)
2583 {
2584 elem->next = *head;
2585 *head = elem;
2586 }
2587
2588 inline_size void
2589 wlist_del (WL *head, WL elem)
2590 {
2591 while (*head)
2592 {
2593 if (expect_true (*head == elem))
2594 {
2595 *head = elem->next;
2596 break;
2597 }
2598
2599 head = &(*head)->next;
2600 }
2601 }
2602
2603 /* internal, faster, version of ev_clear_pending */
2604 inline_speed void
2605 clear_pending (EV_P_ W w)
2606 {
2607 if (w->pending)
2608 {
2609 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2610 w->pending = 0;
2611 }
2612 }
2613
2614 int
2615 ev_clear_pending (EV_P_ void *w)
2616 {
2617 W w_ = (W)w;
2618 int pending = w_->pending;
2619
2620 if (expect_true (pending))
2621 {
2622 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2623 p->w = (W)&pending_w;
2624 w_->pending = 0;
2625 return p->events;
2626 }
2627 else
2628 return 0;
2629 }
2630
2631 inline_size void
2632 pri_adjust (EV_P_ W w)
2633 {
2634 int pri = ev_priority (w);
2635 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2636 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2637 ev_set_priority (w, pri);
2638 }
2639
2640 inline_speed void
2641 ev_start (EV_P_ W w, int active)
2642 {
2643 pri_adjust (EV_A_ w);
2644 w->active = active;
2645 ev_ref (EV_A);
2646 }
2647
2648 inline_size void
2649 ev_stop (EV_P_ W w)
2650 {
2651 ev_unref (EV_A);
2652 w->active = 0;
2653 }
2654
2655 /*****************************************************************************/
2656
2657 void noinline
2658 ev_io_start (EV_P_ ev_io *w)
2659 {
2660 int fd = w->fd;
2661
2662 if (expect_false (ev_is_active (w)))
2663 return;
2664
2665 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2666 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2667
2668 EV_FREQUENT_CHECK;
2669
2670 ev_start (EV_A_ (W)w, 1);
2671 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2672 wlist_add (&anfds[fd].head, (WL)w);
2673
2674 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2675 w->events &= ~EV__IOFDSET;
2676
2677 EV_FREQUENT_CHECK;
2678 }
2679
2680 void noinline
2681 ev_io_stop (EV_P_ ev_io *w)
2682 {
2683 clear_pending (EV_A_ (W)w);
2684 if (expect_false (!ev_is_active (w)))
2685 return;
2686
2687 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2688
2689 EV_FREQUENT_CHECK;
2690
2691 wlist_del (&anfds[w->fd].head, (WL)w);
2692 ev_stop (EV_A_ (W)w);
2693
2694 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2695
2696 EV_FREQUENT_CHECK;
2697 }
2698
2699 void noinline
2700 ev_timer_start (EV_P_ ev_timer *w)
2701 {
2702 if (expect_false (ev_is_active (w)))
2703 return;
2704
2705 ev_at (w) += mn_now;
2706
2707 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2708
2709 EV_FREQUENT_CHECK;
2710
2711 ++timercnt;
2712 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2713 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2714 ANHE_w (timers [ev_active (w)]) = (WT)w;
2715 ANHE_at_cache (timers [ev_active (w)]);
2716 upheap (timers, ev_active (w));
2717
2718 EV_FREQUENT_CHECK;
2719
2720 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2721 }
2722
2723 void noinline
2724 ev_timer_stop (EV_P_ ev_timer *w)
2725 {
2726 clear_pending (EV_A_ (W)w);
2727 if (expect_false (!ev_is_active (w)))
2728 return;
2729
2730 EV_FREQUENT_CHECK;
2731
2732 {
2733 int active = ev_active (w);
2734
2735 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2736
2737 --timercnt;
2738
2739 if (expect_true (active < timercnt + HEAP0))
2740 {
2741 timers [active] = timers [timercnt + HEAP0];
2742 adjustheap (timers, timercnt, active);
2743 }
2744 }
2745
2746 ev_at (w) -= mn_now;
2747
2748 ev_stop (EV_A_ (W)w);
2749
2750 EV_FREQUENT_CHECK;
2751 }
2752
2753 void noinline
2754 ev_timer_again (EV_P_ ev_timer *w)
2755 {
2756 EV_FREQUENT_CHECK;
2757
2758 if (ev_is_active (w))
2759 {
2760 if (w->repeat)
2761 {
2762 ev_at (w) = mn_now + w->repeat;
2763 ANHE_at_cache (timers [ev_active (w)]);
2764 adjustheap (timers, timercnt, ev_active (w));
2765 }
2766 else
2767 ev_timer_stop (EV_A_ w);
2768 }
2769 else if (w->repeat)
2770 {
2771 ev_at (w) = w->repeat;
2772 ev_timer_start (EV_A_ w);
2773 }
2774
2775 EV_FREQUENT_CHECK;
2776 }
2777
2778 ev_tstamp
2779 ev_timer_remaining (EV_P_ ev_timer *w)
2780 {
2781 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2782 }
2783
2784 #if EV_PERIODIC_ENABLE
2785 void noinline
2786 ev_periodic_start (EV_P_ ev_periodic *w)
2787 {
2788 if (expect_false (ev_is_active (w)))
2789 return;
2790
2791 if (w->reschedule_cb)
2792 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2793 else if (w->interval)
2794 {
2795 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2796 periodic_recalc (EV_A_ w);
2797 }
2798 else
2799 ev_at (w) = w->offset;
2800
2801 EV_FREQUENT_CHECK;
2802
2803 ++periodiccnt;
2804 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2805 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2806 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2807 ANHE_at_cache (periodics [ev_active (w)]);
2808 upheap (periodics, ev_active (w));
2809
2810 EV_FREQUENT_CHECK;
2811
2812 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2813 }
2814
2815 void noinline
2816 ev_periodic_stop (EV_P_ ev_periodic *w)
2817 {
2818 clear_pending (EV_A_ (W)w);
2819 if (expect_false (!ev_is_active (w)))
2820 return;
2821
2822 EV_FREQUENT_CHECK;
2823
2824 {
2825 int active = ev_active (w);
2826
2827 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2828
2829 --periodiccnt;
2830
2831 if (expect_true (active < periodiccnt + HEAP0))
2832 {
2833 periodics [active] = periodics [periodiccnt + HEAP0];
2834 adjustheap (periodics, periodiccnt, active);
2835 }
2836 }
2837
2838 ev_stop (EV_A_ (W)w);
2839
2840 EV_FREQUENT_CHECK;
2841 }
2842
2843 void noinline
2844 ev_periodic_again (EV_P_ ev_periodic *w)
2845 {
2846 /* TODO: use adjustheap and recalculation */
2847 ev_periodic_stop (EV_A_ w);
2848 ev_periodic_start (EV_A_ w);
2849 }
2850 #endif
2851
2852 #ifndef SA_RESTART
2853 # define SA_RESTART 0
2854 #endif
2855
2856 #if EV_SIGNAL_ENABLE
2857
2858 void noinline
2859 ev_signal_start (EV_P_ ev_signal *w)
2860 {
2861 if (expect_false (ev_is_active (w)))
2862 return;
2863
2864 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2865
2866 #if EV_MULTIPLICITY
2867 assert (("libev: a signal must not be attached to two different loops",
2868 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2869
2870 signals [w->signum - 1].loop = EV_A;
2871 #endif
2872
2873 EV_FREQUENT_CHECK;
2874
2875 #if EV_USE_SIGNALFD
2876 if (sigfd == -2)
2877 {
2878 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2879 if (sigfd < 0 && errno == EINVAL)
2880 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2881
2882 if (sigfd >= 0)
2883 {
2884 fd_intern (sigfd); /* doing it twice will not hurt */
2885
2886 sigemptyset (&sigfd_set);
2887
2888 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2889 ev_set_priority (&sigfd_w, EV_MAXPRI);
2890 ev_io_start (EV_A_ &sigfd_w);
2891 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2892 }
2893 }
2894
2895 if (sigfd >= 0)
2896 {
2897 /* TODO: check .head */
2898 sigaddset (&sigfd_set, w->signum);
2899 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2900
2901 signalfd (sigfd, &sigfd_set, 0);
2902 }
2903 #endif
2904
2905 ev_start (EV_A_ (W)w, 1);
2906 wlist_add (&signals [w->signum - 1].head, (WL)w);
2907
2908 if (!((WL)w)->next)
2909 # if EV_USE_SIGNALFD
2910 if (sigfd < 0) /*TODO*/
2911 # endif
2912 {
2913 # ifdef _WIN32
2914 evpipe_init (EV_A);
2915
2916 signal (w->signum, ev_sighandler);
2917 # else
2918 struct sigaction sa;
2919
2920 evpipe_init (EV_A);
2921
2922 sa.sa_handler = ev_sighandler;
2923 sigfillset (&sa.sa_mask);
2924 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2925 sigaction (w->signum, &sa, 0);
2926
2927 if (origflags & EVFLAG_NOSIGMASK)
2928 {
2929 sigemptyset (&sa.sa_mask);
2930 sigaddset (&sa.sa_mask, w->signum);
2931 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2932 }
2933 #endif
2934 }
2935
2936 EV_FREQUENT_CHECK;
2937 }
2938
2939 void noinline
2940 ev_signal_stop (EV_P_ ev_signal *w)
2941 {
2942 clear_pending (EV_A_ (W)w);
2943 if (expect_false (!ev_is_active (w)))
2944 return;
2945
2946 EV_FREQUENT_CHECK;
2947
2948 wlist_del (&signals [w->signum - 1].head, (WL)w);
2949 ev_stop (EV_A_ (W)w);
2950
2951 if (!signals [w->signum - 1].head)
2952 {
2953 #if EV_MULTIPLICITY
2954 signals [w->signum - 1].loop = 0; /* unattach from signal */
2955 #endif
2956 #if EV_USE_SIGNALFD
2957 if (sigfd >= 0)
2958 {
2959 sigset_t ss;
2960
2961 sigemptyset (&ss);
2962 sigaddset (&ss, w->signum);
2963 sigdelset (&sigfd_set, w->signum);
2964
2965 signalfd (sigfd, &sigfd_set, 0);
2966 sigprocmask (SIG_UNBLOCK, &ss, 0);
2967 }
2968 else
2969 #endif
2970 signal (w->signum, SIG_DFL);
2971 }
2972
2973 EV_FREQUENT_CHECK;
2974 }
2975
2976 #endif
2977
2978 #if EV_CHILD_ENABLE
2979
2980 void
2981 ev_child_start (EV_P_ ev_child *w)
2982 {
2983 #if EV_MULTIPLICITY
2984 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2985 #endif
2986 if (expect_false (ev_is_active (w)))
2987 return;
2988
2989 EV_FREQUENT_CHECK;
2990
2991 ev_start (EV_A_ (W)w, 1);
2992 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2993
2994 EV_FREQUENT_CHECK;
2995 }
2996
2997 void
2998 ev_child_stop (EV_P_ ev_child *w)
2999 {
3000 clear_pending (EV_A_ (W)w);
3001 if (expect_false (!ev_is_active (w)))
3002 return;
3003
3004 EV_FREQUENT_CHECK;
3005
3006 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3007 ev_stop (EV_A_ (W)w);
3008
3009 EV_FREQUENT_CHECK;
3010 }
3011
3012 #endif
3013
3014 #if EV_STAT_ENABLE
3015
3016 # ifdef _WIN32
3017 # undef lstat
3018 # define lstat(a,b) _stati64 (a,b)
3019 # endif
3020
3021 #define DEF_STAT_INTERVAL 5.0074891
3022 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3023 #define MIN_STAT_INTERVAL 0.1074891
3024
3025 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3026
3027 #if EV_USE_INOTIFY
3028
3029 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3030 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3031
3032 static void noinline
3033 infy_add (EV_P_ ev_stat *w)
3034 {
3035 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);
3036
3037 if (w->wd >= 0)
3038 {
3039 struct statfs sfs;
3040
3041 /* now local changes will be tracked by inotify, but remote changes won't */
3042 /* unless the filesystem is known to be local, we therefore still poll */
3043 /* also do poll on <2.6.25, but with normal frequency */
3044
3045 if (!fs_2625)
3046 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3047 else if (!statfs (w->path, &sfs)
3048 && (sfs.f_type == 0x1373 /* devfs */
3049 || sfs.f_type == 0xEF53 /* ext2/3 */
3050 || sfs.f_type == 0x3153464a /* jfs */
3051 || sfs.f_type == 0x52654973 /* reiser3 */
3052 || sfs.f_type == 0x01021994 /* tempfs */
3053 || sfs.f_type == 0x58465342 /* xfs */))
3054 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3055 else
3056 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3057 }
3058 else
3059 {
3060 /* can't use inotify, continue to stat */
3061 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3062
3063 /* if path is not there, monitor some parent directory for speedup hints */
3064 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3065 /* but an efficiency issue only */
3066 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3067 {
3068 char path [4096];
3069 strcpy (path, w->path);
3070
3071 do
3072 {
3073 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3074 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3075
3076 char *pend = strrchr (path, '/');
3077
3078 if (!pend || pend == path)
3079 break;
3080
3081 *pend = 0;
3082 w->wd = inotify_add_watch (fs_fd, path, mask);
3083 }
3084 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3085 }
3086 }
3087
3088 if (w->wd >= 0)
3089 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3090
3091 /* now re-arm timer, if required */
3092 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3093 ev_timer_again (EV_A_ &w->timer);
3094 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3095 }
3096
3097 static void noinline
3098 infy_del (EV_P_ ev_stat *w)
3099 {
3100 int slot;
3101 int wd = w->wd;
3102
3103 if (wd < 0)
3104 return;
3105
3106 w->wd = -2;
3107 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3108 wlist_del (&fs_hash [slot].head, (WL)w);
3109
3110 /* remove this watcher, if others are watching it, they will rearm */
3111 inotify_rm_watch (fs_fd, wd);
3112 }
3113
3114 static void noinline
3115 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3116 {
3117 if (slot < 0)
3118 /* overflow, need to check for all hash slots */
3119 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3120 infy_wd (EV_A_ slot, wd, ev);
3121 else
3122 {
3123 WL w_;
3124
3125 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3126 {
3127 ev_stat *w = (ev_stat *)w_;
3128 w_ = w_->next; /* lets us remove this watcher and all before it */
3129
3130 if (w->wd == wd || wd == -1)
3131 {
3132 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3133 {
3134 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3135 w->wd = -1;
3136 infy_add (EV_A_ w); /* re-add, no matter what */
3137 }
3138
3139 stat_timer_cb (EV_A_ &w->timer, 0);
3140 }
3141 }
3142 }
3143 }
3144
3145 static void
3146 infy_cb (EV_P_ ev_io *w, int revents)
3147 {
3148 char buf [EV_INOTIFY_BUFSIZE];
3149 int ofs;
3150 int len = read (fs_fd, buf, sizeof (buf));
3151
3152 for (ofs = 0; ofs < len; )
3153 {
3154 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3155 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3156 ofs += sizeof (struct inotify_event) + ev->len;
3157 }
3158 }
3159
3160 inline_size void
3161 ev_check_2625 (EV_P)
3162 {
3163 /* kernels < 2.6.25 are borked
3164 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3165 */
3166 if (ev_linux_version () < 0x020619)
3167 return;
3168
3169 fs_2625 = 1;
3170 }
3171
3172 inline_size int
3173 infy_newfd (void)
3174 {
3175 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3176 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3177 if (fd >= 0)
3178 return fd;
3179 #endif
3180 return inotify_init ();
3181 }
3182
3183 inline_size void
3184 infy_init (EV_P)
3185 {
3186 if (fs_fd != -2)
3187 return;
3188
3189 fs_fd = -1;
3190
3191 ev_check_2625 (EV_A);
3192
3193 fs_fd = infy_newfd ();
3194
3195 if (fs_fd >= 0)
3196 {
3197 fd_intern (fs_fd);
3198 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3199 ev_set_priority (&fs_w, EV_MAXPRI);
3200 ev_io_start (EV_A_ &fs_w);
3201 ev_unref (EV_A);
3202 }
3203 }
3204
3205 inline_size void
3206 infy_fork (EV_P)
3207 {
3208 int slot;
3209
3210 if (fs_fd < 0)
3211 return;
3212
3213 ev_ref (EV_A);
3214 ev_io_stop (EV_A_ &fs_w);
3215 close (fs_fd);
3216 fs_fd = infy_newfd ();
3217
3218 if (fs_fd >= 0)
3219 {
3220 fd_intern (fs_fd);
3221 ev_io_set (&fs_w, fs_fd, EV_READ);
3222 ev_io_start (EV_A_ &fs_w);
3223 ev_unref (EV_A);
3224 }
3225
3226 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3227 {
3228 WL w_ = fs_hash [slot].head;
3229 fs_hash [slot].head = 0;
3230
3231 while (w_)
3232 {
3233 ev_stat *w = (ev_stat *)w_;
3234 w_ = w_->next; /* lets us add this watcher */
3235
3236 w->wd = -1;
3237
3238 if (fs_fd >= 0)
3239 infy_add (EV_A_ w); /* re-add, no matter what */
3240 else
3241 {
3242 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3243 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3244 ev_timer_again (EV_A_ &w->timer);
3245 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3246 }
3247 }
3248 }
3249 }
3250
3251 #endif
3252
3253 #ifdef _WIN32
3254 # define EV_LSTAT(p,b) _stati64 (p, b)
3255 #else
3256 # define EV_LSTAT(p,b) lstat (p, b)
3257 #endif
3258
3259 void
3260 ev_stat_stat (EV_P_ ev_stat *w)
3261 {
3262 if (lstat (w->path, &w->attr) < 0)
3263 w->attr.st_nlink = 0;
3264 else if (!w->attr.st_nlink)
3265 w->attr.st_nlink = 1;
3266 }
3267
3268 static void noinline
3269 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3270 {
3271 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3272
3273 ev_statdata prev = w->attr;
3274 ev_stat_stat (EV_A_ w);
3275
3276 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3277 if (
3278 prev.st_dev != w->attr.st_dev
3279 || prev.st_ino != w->attr.st_ino
3280 || prev.st_mode != w->attr.st_mode
3281 || prev.st_nlink != w->attr.st_nlink
3282 || prev.st_uid != w->attr.st_uid
3283 || prev.st_gid != w->attr.st_gid
3284 || prev.st_rdev != w->attr.st_rdev
3285 || prev.st_size != w->attr.st_size
3286 || prev.st_atime != w->attr.st_atime
3287 || prev.st_mtime != w->attr.st_mtime
3288 || prev.st_ctime != w->attr.st_ctime
3289 ) {
3290 /* we only update w->prev on actual differences */
3291 /* in case we test more often than invoke the callback, */
3292 /* to ensure that prev is always different to attr */
3293 w->prev = prev;
3294
3295 #if EV_USE_INOTIFY
3296 if (fs_fd >= 0)
3297 {
3298 infy_del (EV_A_ w);
3299 infy_add (EV_A_ w);
3300 ev_stat_stat (EV_A_ w); /* avoid race... */
3301 }
3302 #endif
3303
3304 ev_feed_event (EV_A_ w, EV_STAT);
3305 }
3306 }
3307
3308 void
3309 ev_stat_start (EV_P_ ev_stat *w)
3310 {
3311 if (expect_false (ev_is_active (w)))
3312 return;
3313
3314 ev_stat_stat (EV_A_ w);
3315
3316 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3317 w->interval = MIN_STAT_INTERVAL;
3318
3319 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3320 ev_set_priority (&w->timer, ev_priority (w));
3321
3322 #if EV_USE_INOTIFY
3323 infy_init (EV_A);
3324
3325 if (fs_fd >= 0)
3326 infy_add (EV_A_ w);
3327 else
3328 #endif
3329 {
3330 ev_timer_again (EV_A_ &w->timer);
3331 ev_unref (EV_A);
3332 }
3333
3334 ev_start (EV_A_ (W)w, 1);
3335
3336 EV_FREQUENT_CHECK;
3337 }
3338
3339 void
3340 ev_stat_stop (EV_P_ ev_stat *w)
3341 {
3342 clear_pending (EV_A_ (W)w);
3343 if (expect_false (!ev_is_active (w)))
3344 return;
3345
3346 EV_FREQUENT_CHECK;
3347
3348 #if EV_USE_INOTIFY
3349 infy_del (EV_A_ w);
3350 #endif
3351
3352 if (ev_is_active (&w->timer))
3353 {
3354 ev_ref (EV_A);
3355 ev_timer_stop (EV_A_ &w->timer);
3356 }
3357
3358 ev_stop (EV_A_ (W)w);
3359
3360 EV_FREQUENT_CHECK;
3361 }
3362 #endif
3363
3364 #if EV_IDLE_ENABLE
3365 void
3366 ev_idle_start (EV_P_ ev_idle *w)
3367 {
3368 if (expect_false (ev_is_active (w)))
3369 return;
3370
3371 pri_adjust (EV_A_ (W)w);
3372
3373 EV_FREQUENT_CHECK;
3374
3375 {
3376 int active = ++idlecnt [ABSPRI (w)];
3377
3378 ++idleall;
3379 ev_start (EV_A_ (W)w, active);
3380
3381 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3382 idles [ABSPRI (w)][active - 1] = w;
3383 }
3384
3385 EV_FREQUENT_CHECK;
3386 }
3387
3388 void
3389 ev_idle_stop (EV_P_ ev_idle *w)
3390 {
3391 clear_pending (EV_A_ (W)w);
3392 if (expect_false (!ev_is_active (w)))
3393 return;
3394
3395 EV_FREQUENT_CHECK;
3396
3397 {
3398 int active = ev_active (w);
3399
3400 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3401 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3402
3403 ev_stop (EV_A_ (W)w);
3404 --idleall;
3405 }
3406
3407 EV_FREQUENT_CHECK;
3408 }
3409 #endif
3410
3411 #if EV_PREPARE_ENABLE
3412 void
3413 ev_prepare_start (EV_P_ ev_prepare *w)
3414 {
3415 if (expect_false (ev_is_active (w)))
3416 return;
3417
3418 EV_FREQUENT_CHECK;
3419
3420 ev_start (EV_A_ (W)w, ++preparecnt);
3421 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3422 prepares [preparecnt - 1] = w;
3423
3424 EV_FREQUENT_CHECK;
3425 }
3426
3427 void
3428 ev_prepare_stop (EV_P_ ev_prepare *w)
3429 {
3430 clear_pending (EV_A_ (W)w);
3431 if (expect_false (!ev_is_active (w)))
3432 return;
3433
3434 EV_FREQUENT_CHECK;
3435
3436 {
3437 int active = ev_active (w);
3438
3439 prepares [active - 1] = prepares [--preparecnt];
3440 ev_active (prepares [active - 1]) = active;
3441 }
3442
3443 ev_stop (EV_A_ (W)w);
3444
3445 EV_FREQUENT_CHECK;
3446 }
3447 #endif
3448
3449 #if EV_CHECK_ENABLE
3450 void
3451 ev_check_start (EV_P_ ev_check *w)
3452 {
3453 if (expect_false (ev_is_active (w)))
3454 return;
3455
3456 EV_FREQUENT_CHECK;
3457
3458 ev_start (EV_A_ (W)w, ++checkcnt);
3459 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3460 checks [checkcnt - 1] = w;
3461
3462 EV_FREQUENT_CHECK;
3463 }
3464
3465 void
3466 ev_check_stop (EV_P_ ev_check *w)
3467 {
3468 clear_pending (EV_A_ (W)w);
3469 if (expect_false (!ev_is_active (w)))
3470 return;
3471
3472 EV_FREQUENT_CHECK;
3473
3474 {
3475 int active = ev_active (w);
3476
3477 checks [active - 1] = checks [--checkcnt];
3478 ev_active (checks [active - 1]) = active;
3479 }
3480
3481 ev_stop (EV_A_ (W)w);
3482
3483 EV_FREQUENT_CHECK;
3484 }
3485 #endif
3486
3487 #if EV_EMBED_ENABLE
3488 void noinline
3489 ev_embed_sweep (EV_P_ ev_embed *w)
3490 {
3491 ev_run (w->other, EVRUN_NOWAIT);
3492 }
3493
3494 static void
3495 embed_io_cb (EV_P_ ev_io *io, int revents)
3496 {
3497 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3498
3499 if (ev_cb (w))
3500 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3501 else
3502 ev_run (w->other, EVRUN_NOWAIT);
3503 }
3504
3505 static void
3506 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3507 {
3508 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3509
3510 {
3511 EV_P = w->other;
3512
3513 while (fdchangecnt)
3514 {
3515 fd_reify (EV_A);
3516 ev_run (EV_A_ EVRUN_NOWAIT);
3517 }
3518 }
3519 }
3520
3521 static void
3522 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3523 {
3524 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3525
3526 ev_embed_stop (EV_A_ w);
3527
3528 {
3529 EV_P = w->other;
3530
3531 ev_loop_fork (EV_A);
3532 ev_run (EV_A_ EVRUN_NOWAIT);
3533 }
3534
3535 ev_embed_start (EV_A_ w);
3536 }
3537
3538 #if 0
3539 static void
3540 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3541 {
3542 ev_idle_stop (EV_A_ idle);
3543 }
3544 #endif
3545
3546 void
3547 ev_embed_start (EV_P_ ev_embed *w)
3548 {
3549 if (expect_false (ev_is_active (w)))
3550 return;
3551
3552 {
3553 EV_P = w->other;
3554 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3555 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3556 }
3557
3558 EV_FREQUENT_CHECK;
3559
3560 ev_set_priority (&w->io, ev_priority (w));
3561 ev_io_start (EV_A_ &w->io);
3562
3563 ev_prepare_init (&w->prepare, embed_prepare_cb);
3564 ev_set_priority (&w->prepare, EV_MINPRI);
3565 ev_prepare_start (EV_A_ &w->prepare);
3566
3567 ev_fork_init (&w->fork, embed_fork_cb);
3568 ev_fork_start (EV_A_ &w->fork);
3569
3570 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3571
3572 ev_start (EV_A_ (W)w, 1);
3573
3574 EV_FREQUENT_CHECK;
3575 }
3576
3577 void
3578 ev_embed_stop (EV_P_ ev_embed *w)
3579 {
3580 clear_pending (EV_A_ (W)w);
3581 if (expect_false (!ev_is_active (w)))
3582 return;
3583
3584 EV_FREQUENT_CHECK;
3585
3586 ev_io_stop (EV_A_ &w->io);
3587 ev_prepare_stop (EV_A_ &w->prepare);
3588 ev_fork_stop (EV_A_ &w->fork);
3589
3590 ev_stop (EV_A_ (W)w);
3591
3592 EV_FREQUENT_CHECK;
3593 }
3594 #endif
3595
3596 #if EV_FORK_ENABLE
3597 void
3598 ev_fork_start (EV_P_ ev_fork *w)
3599 {
3600 if (expect_false (ev_is_active (w)))
3601 return;
3602
3603 EV_FREQUENT_CHECK;
3604
3605 ev_start (EV_A_ (W)w, ++forkcnt);
3606 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3607 forks [forkcnt - 1] = w;
3608
3609 EV_FREQUENT_CHECK;
3610 }
3611
3612 void
3613 ev_fork_stop (EV_P_ ev_fork *w)
3614 {
3615 clear_pending (EV_A_ (W)w);
3616 if (expect_false (!ev_is_active (w)))
3617 return;
3618
3619 EV_FREQUENT_CHECK;
3620
3621 {
3622 int active = ev_active (w);
3623
3624 forks [active - 1] = forks [--forkcnt];
3625 ev_active (forks [active - 1]) = active;
3626 }
3627
3628 ev_stop (EV_A_ (W)w);
3629
3630 EV_FREQUENT_CHECK;
3631 }
3632 #endif
3633
3634 #if EV_CLEANUP_ENABLE
3635 void
3636 ev_cleanup_start (EV_P_ ev_cleanup *w)
3637 {
3638 if (expect_false (ev_is_active (w)))
3639 return;
3640
3641 EV_FREQUENT_CHECK;
3642
3643 ev_start (EV_A_ (W)w, ++cleanupcnt);
3644 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3645 cleanups [cleanupcnt - 1] = w;
3646
3647 /* cleanup watchers should never keep a refcount on the loop */
3648 ev_unref (EV_A);
3649 EV_FREQUENT_CHECK;
3650 }
3651
3652 void
3653 ev_cleanup_stop (EV_P_ ev_cleanup *w)
3654 {
3655 clear_pending (EV_A_ (W)w);
3656 if (expect_false (!ev_is_active (w)))
3657 return;
3658
3659 EV_FREQUENT_CHECK;
3660 ev_ref (EV_A);
3661
3662 {
3663 int active = ev_active (w);
3664
3665 cleanups [active - 1] = cleanups [--cleanupcnt];
3666 ev_active (cleanups [active - 1]) = active;
3667 }
3668
3669 ev_stop (EV_A_ (W)w);
3670
3671 EV_FREQUENT_CHECK;
3672 }
3673 #endif
3674
3675 #if EV_ASYNC_ENABLE
3676 void
3677 ev_async_start (EV_P_ ev_async *w)
3678 {
3679 if (expect_false (ev_is_active (w)))
3680 return;
3681
3682 w->sent = 0;
3683
3684 evpipe_init (EV_A);
3685
3686 EV_FREQUENT_CHECK;
3687
3688 ev_start (EV_A_ (W)w, ++asynccnt);
3689 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3690 asyncs [asynccnt - 1] = w;
3691
3692 EV_FREQUENT_CHECK;
3693 }
3694
3695 void
3696 ev_async_stop (EV_P_ ev_async *w)
3697 {
3698 clear_pending (EV_A_ (W)w);
3699 if (expect_false (!ev_is_active (w)))
3700 return;
3701
3702 EV_FREQUENT_CHECK;
3703
3704 {
3705 int active = ev_active (w);
3706
3707 asyncs [active - 1] = asyncs [--asynccnt];
3708 ev_active (asyncs [active - 1]) = active;
3709 }
3710
3711 ev_stop (EV_A_ (W)w);
3712
3713 EV_FREQUENT_CHECK;
3714 }
3715
3716 void
3717 ev_async_send (EV_P_ ev_async *w)
3718 {
3719 w->sent = 1;
3720 evpipe_write (EV_A_ &async_pending);
3721 }
3722 #endif
3723
3724 /*****************************************************************************/
3725
3726 struct ev_once
3727 {
3728 ev_io io;
3729 ev_timer to;
3730 void (*cb)(int revents, void *arg);
3731 void *arg;
3732 };
3733
3734 static void
3735 once_cb (EV_P_ struct ev_once *once, int revents)
3736 {
3737 void (*cb)(int revents, void *arg) = once->cb;
3738 void *arg = once->arg;
3739
3740 ev_io_stop (EV_A_ &once->io);
3741 ev_timer_stop (EV_A_ &once->to);
3742 ev_free (once);
3743
3744 cb (revents, arg);
3745 }
3746
3747 static void
3748 once_cb_io (EV_P_ ev_io *w, int revents)
3749 {
3750 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3751
3752 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3753 }
3754
3755 static void
3756 once_cb_to (EV_P_ ev_timer *w, int revents)
3757 {
3758 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3759
3760 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3761 }
3762
3763 void
3764 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3765 {
3766 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3767
3768 if (expect_false (!once))
3769 {
3770 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3771 return;
3772 }
3773
3774 once->cb = cb;
3775 once->arg = arg;
3776
3777 ev_init (&once->io, once_cb_io);
3778 if (fd >= 0)
3779 {
3780 ev_io_set (&once->io, fd, events);
3781 ev_io_start (EV_A_ &once->io);
3782 }
3783
3784 ev_init (&once->to, once_cb_to);
3785 if (timeout >= 0.)
3786 {
3787 ev_timer_set (&once->to, timeout, 0.);
3788 ev_timer_start (EV_A_ &once->to);
3789 }
3790 }
3791
3792 /*****************************************************************************/
3793
3794 #if EV_WALK_ENABLE
3795 void
3796 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3797 {
3798 int i, j;
3799 ev_watcher_list *wl, *wn;
3800
3801 if (types & (EV_IO | EV_EMBED))
3802 for (i = 0; i < anfdmax; ++i)
3803 for (wl = anfds [i].head; wl; )
3804 {
3805 wn = wl->next;
3806
3807 #if EV_EMBED_ENABLE
3808 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3809 {
3810 if (types & EV_EMBED)
3811 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3812 }
3813 else
3814 #endif
3815 #if EV_USE_INOTIFY
3816 if (ev_cb ((ev_io *)wl) == infy_cb)
3817 ;
3818 else
3819 #endif
3820 if ((ev_io *)wl != &pipe_w)
3821 if (types & EV_IO)
3822 cb (EV_A_ EV_IO, wl);
3823
3824 wl = wn;
3825 }
3826
3827 if (types & (EV_TIMER | EV_STAT))
3828 for (i = timercnt + HEAP0; i-- > HEAP0; )
3829 #if EV_STAT_ENABLE
3830 /*TODO: timer is not always active*/
3831 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3832 {
3833 if (types & EV_STAT)
3834 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3835 }
3836 else
3837 #endif
3838 if (types & EV_TIMER)
3839 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3840
3841 #if EV_PERIODIC_ENABLE
3842 if (types & EV_PERIODIC)
3843 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3844 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3845 #endif
3846
3847 #if EV_IDLE_ENABLE
3848 if (types & EV_IDLE)
3849 for (j = NUMPRI; i--; )
3850 for (i = idlecnt [j]; i--; )
3851 cb (EV_A_ EV_IDLE, idles [j][i]);
3852 #endif
3853
3854 #if EV_FORK_ENABLE
3855 if (types & EV_FORK)
3856 for (i = forkcnt; i--; )
3857 if (ev_cb (forks [i]) != embed_fork_cb)
3858 cb (EV_A_ EV_FORK, forks [i]);
3859 #endif
3860
3861 #if EV_ASYNC_ENABLE
3862 if (types & EV_ASYNC)
3863 for (i = asynccnt; i--; )
3864 cb (EV_A_ EV_ASYNC, asyncs [i]);
3865 #endif
3866
3867 #if EV_PREPARE_ENABLE
3868 if (types & EV_PREPARE)
3869 for (i = preparecnt; i--; )
3870 # if EV_EMBED_ENABLE
3871 if (ev_cb (prepares [i]) != embed_prepare_cb)
3872 # endif
3873 cb (EV_A_ EV_PREPARE, prepares [i]);
3874 #endif
3875
3876 #if EV_CHECK_ENABLE
3877 if (types & EV_CHECK)
3878 for (i = checkcnt; i--; )
3879 cb (EV_A_ EV_CHECK, checks [i]);
3880 #endif
3881
3882 #if EV_SIGNAL_ENABLE
3883 if (types & EV_SIGNAL)
3884 for (i = 0; i < EV_NSIG - 1; ++i)
3885 for (wl = signals [i].head; wl; )
3886 {
3887 wn = wl->next;
3888 cb (EV_A_ EV_SIGNAL, wl);
3889 wl = wn;
3890 }
3891 #endif
3892
3893 #if EV_CHILD_ENABLE
3894 if (types & EV_CHILD)
3895 for (i = (EV_PID_HASHSIZE); i--; )
3896 for (wl = childs [i]; wl; )
3897 {
3898 wn = wl->next;
3899 cb (EV_A_ EV_CHILD, wl);
3900 wl = wn;
3901 }
3902 #endif
3903 /* EV_STAT 0x00001000 /* stat data changed */
3904 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
3905 }
3906 #endif
3907
3908 #if EV_MULTIPLICITY
3909 #include "ev_wrap.h"
3910 #endif
3911
3912 EV_CPP(})
3913