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Revision: 1.378
Committed: Mon Jun 13 09:52:36 2011 UTC (13 years, 1 month ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.377: +71 -46 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 /* this big block deduces configuration from config.h */
41 #ifndef EV_STANDALONE
42 # ifdef EV_CONFIG_H
43 # include EV_CONFIG_H
44 # else
45 # include "config.h"
46 # endif
47
48 #if HAVE_FLOOR
49 # ifndef EV_USE_FLOOR
50 # define EV_USE_FLOOR 1
51 # endif
52 #endif
53
54 # if HAVE_CLOCK_SYSCALL
55 # ifndef EV_USE_CLOCK_SYSCALL
56 # define EV_USE_CLOCK_SYSCALL 1
57 # ifndef EV_USE_REALTIME
58 # define EV_USE_REALTIME 0
59 # endif
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 1
62 # endif
63 # endif
64 # elif !defined(EV_USE_CLOCK_SYSCALL)
65 # define EV_USE_CLOCK_SYSCALL 0
66 # endif
67
68 # if HAVE_CLOCK_GETTIME
69 # ifndef EV_USE_MONOTONIC
70 # define EV_USE_MONOTONIC 1
71 # endif
72 # ifndef EV_USE_REALTIME
73 # define EV_USE_REALTIME 0
74 # endif
75 # else
76 # ifndef EV_USE_MONOTONIC
77 # define EV_USE_MONOTONIC 0
78 # endif
79 # ifndef EV_USE_REALTIME
80 # define EV_USE_REALTIME 0
81 # endif
82 # endif
83
84 # if HAVE_NANOSLEEP
85 # ifndef EV_USE_NANOSLEEP
86 # define EV_USE_NANOSLEEP EV_FEATURE_OS
87 # endif
88 # else
89 # undef EV_USE_NANOSLEEP
90 # define EV_USE_NANOSLEEP 0
91 # endif
92
93 # if HAVE_SELECT && HAVE_SYS_SELECT_H
94 # ifndef EV_USE_SELECT
95 # define EV_USE_SELECT EV_FEATURE_BACKENDS
96 # endif
97 # else
98 # undef EV_USE_SELECT
99 # define EV_USE_SELECT 0
100 # endif
101
102 # if HAVE_POLL && HAVE_POLL_H
103 # ifndef EV_USE_POLL
104 # define EV_USE_POLL EV_FEATURE_BACKENDS
105 # endif
106 # else
107 # undef EV_USE_POLL
108 # define EV_USE_POLL 0
109 # endif
110
111 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
112 # ifndef EV_USE_EPOLL
113 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
114 # endif
115 # else
116 # undef EV_USE_EPOLL
117 # define EV_USE_EPOLL 0
118 # endif
119
120 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
121 # ifndef EV_USE_KQUEUE
122 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
123 # endif
124 # else
125 # undef EV_USE_KQUEUE
126 # define EV_USE_KQUEUE 0
127 # endif
128
129 # if HAVE_PORT_H && HAVE_PORT_CREATE
130 # ifndef EV_USE_PORT
131 # define EV_USE_PORT EV_FEATURE_BACKENDS
132 # endif
133 # else
134 # undef EV_USE_PORT
135 # define EV_USE_PORT 0
136 # endif
137
138 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
139 # ifndef EV_USE_INOTIFY
140 # define EV_USE_INOTIFY EV_FEATURE_OS
141 # endif
142 # else
143 # undef EV_USE_INOTIFY
144 # define EV_USE_INOTIFY 0
145 # endif
146
147 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
148 # ifndef EV_USE_SIGNALFD
149 # define EV_USE_SIGNALFD EV_FEATURE_OS
150 # endif
151 # else
152 # undef EV_USE_SIGNALFD
153 # define EV_USE_SIGNALFD 0
154 # endif
155
156 # if HAVE_EVENTFD
157 # ifndef EV_USE_EVENTFD
158 # define EV_USE_EVENTFD EV_FEATURE_OS
159 # endif
160 # else
161 # undef EV_USE_EVENTFD
162 # define EV_USE_EVENTFD 0
163 # endif
164
165 #endif
166
167 #include <stdlib.h>
168 #include <string.h>
169 #include <fcntl.h>
170 #include <stddef.h>
171
172 #include <stdio.h>
173
174 #include <assert.h>
175 #include <errno.h>
176 #include <sys/types.h>
177 #include <time.h>
178 #include <limits.h>
179
180 #include <signal.h>
181
182 #ifdef EV_H
183 # include EV_H
184 #else
185 # include "ev.h"
186 #endif
187
188 EV_CPP(extern "C" {)
189
190 #ifndef _WIN32
191 # include <sys/time.h>
192 # include <sys/wait.h>
193 # include <unistd.h>
194 #else
195 # include <io.h>
196 # define WIN32_LEAN_AND_MEAN
197 # include <windows.h>
198 # ifndef EV_SELECT_IS_WINSOCKET
199 # define EV_SELECT_IS_WINSOCKET 1
200 # endif
201 # undef EV_AVOID_STDIO
202 #endif
203
204 /* OS X, in its infinite idiocy, actually HARDCODES
205 * a limit of 1024 into their select. Where people have brains,
206 * OS X engineers apparently have a vacuum. Or maybe they were
207 * ordered to have a vacuum, or they do anything for money.
208 * This might help. Or not.
209 */
210 #define _DARWIN_UNLIMITED_SELECT 1
211
212 /* this block tries to deduce configuration from header-defined symbols and defaults */
213
214 /* try to deduce the maximum number of signals on this platform */
215 #if defined (EV_NSIG)
216 /* use what's provided */
217 #elif defined (NSIG)
218 # define EV_NSIG (NSIG)
219 #elif defined(_NSIG)
220 # define EV_NSIG (_NSIG)
221 #elif defined (SIGMAX)
222 # define EV_NSIG (SIGMAX+1)
223 #elif defined (SIG_MAX)
224 # define EV_NSIG (SIG_MAX+1)
225 #elif defined (_SIG_MAX)
226 # define EV_NSIG (_SIG_MAX+1)
227 #elif defined (MAXSIG)
228 # define EV_NSIG (MAXSIG+1)
229 #elif defined (MAX_SIG)
230 # define EV_NSIG (MAX_SIG+1)
231 #elif defined (SIGARRAYSIZE)
232 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
233 #elif defined (_sys_nsig)
234 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
235 #else
236 # error "unable to find value for NSIG, please report"
237 /* to make it compile regardless, just remove the above line, */
238 /* but consider reporting it, too! :) */
239 # define EV_NSIG 65
240 #endif
241
242 #ifndef EV_USE_FLOOR
243 # define EV_USE_FLOOR 0
244 #endif
245
246 #ifndef EV_USE_CLOCK_SYSCALL
247 # if __linux && __GLIBC__ >= 2
248 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
249 # else
250 # define EV_USE_CLOCK_SYSCALL 0
251 # endif
252 #endif
253
254 #ifndef EV_USE_MONOTONIC
255 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
256 # define EV_USE_MONOTONIC EV_FEATURE_OS
257 # else
258 # define EV_USE_MONOTONIC 0
259 # endif
260 #endif
261
262 #ifndef EV_USE_REALTIME
263 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
264 #endif
265
266 #ifndef EV_USE_NANOSLEEP
267 # if _POSIX_C_SOURCE >= 199309L
268 # define EV_USE_NANOSLEEP EV_FEATURE_OS
269 # else
270 # define EV_USE_NANOSLEEP 0
271 # endif
272 #endif
273
274 #ifndef EV_USE_SELECT
275 # define EV_USE_SELECT EV_FEATURE_BACKENDS
276 #endif
277
278 #ifndef EV_USE_POLL
279 # ifdef _WIN32
280 # define EV_USE_POLL 0
281 # else
282 # define EV_USE_POLL EV_FEATURE_BACKENDS
283 # endif
284 #endif
285
286 #ifndef EV_USE_EPOLL
287 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
288 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
289 # else
290 # define EV_USE_EPOLL 0
291 # endif
292 #endif
293
294 #ifndef EV_USE_KQUEUE
295 # define EV_USE_KQUEUE 0
296 #endif
297
298 #ifndef EV_USE_PORT
299 # define EV_USE_PORT 0
300 #endif
301
302 #ifndef EV_USE_INOTIFY
303 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
304 # define EV_USE_INOTIFY EV_FEATURE_OS
305 # else
306 # define EV_USE_INOTIFY 0
307 # endif
308 #endif
309
310 #ifndef EV_PID_HASHSIZE
311 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
312 #endif
313
314 #ifndef EV_INOTIFY_HASHSIZE
315 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
316 #endif
317
318 #ifndef EV_USE_EVENTFD
319 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
320 # define EV_USE_EVENTFD EV_FEATURE_OS
321 # else
322 # define EV_USE_EVENTFD 0
323 # endif
324 #endif
325
326 #ifndef EV_USE_SIGNALFD
327 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
328 # define EV_USE_SIGNALFD EV_FEATURE_OS
329 # else
330 # define EV_USE_SIGNALFD 0
331 # endif
332 #endif
333
334 #if 0 /* debugging */
335 # define EV_VERIFY 3
336 # define EV_USE_4HEAP 1
337 # define EV_HEAP_CACHE_AT 1
338 #endif
339
340 #ifndef EV_VERIFY
341 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
342 #endif
343
344 #ifndef EV_USE_4HEAP
345 # define EV_USE_4HEAP EV_FEATURE_DATA
346 #endif
347
348 #ifndef EV_HEAP_CACHE_AT
349 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
350 #endif
351
352 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
353 /* which makes programs even slower. might work on other unices, too. */
354 #if EV_USE_CLOCK_SYSCALL
355 # include <syscall.h>
356 # ifdef SYS_clock_gettime
357 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
358 # undef EV_USE_MONOTONIC
359 # define EV_USE_MONOTONIC 1
360 # else
361 # undef EV_USE_CLOCK_SYSCALL
362 # define EV_USE_CLOCK_SYSCALL 0
363 # endif
364 #endif
365
366 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
367
368 #ifdef _AIX
369 /* AIX has a completely broken poll.h header */
370 # undef EV_USE_POLL
371 # define EV_USE_POLL 0
372 #endif
373
374 #ifndef CLOCK_MONOTONIC
375 # undef EV_USE_MONOTONIC
376 # define EV_USE_MONOTONIC 0
377 #endif
378
379 #ifndef CLOCK_REALTIME
380 # undef EV_USE_REALTIME
381 # define EV_USE_REALTIME 0
382 #endif
383
384 #if !EV_STAT_ENABLE
385 # undef EV_USE_INOTIFY
386 # define EV_USE_INOTIFY 0
387 #endif
388
389 #if !EV_USE_NANOSLEEP
390 /* hp-ux has it in sys/time.h, which we unconditionally include above */
391 # if !defined(_WIN32) && !defined(__hpux)
392 # include <sys/select.h>
393 # endif
394 #endif
395
396 #if EV_USE_INOTIFY
397 # include <sys/statfs.h>
398 # include <sys/inotify.h>
399 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
400 # ifndef IN_DONT_FOLLOW
401 # undef EV_USE_INOTIFY
402 # define EV_USE_INOTIFY 0
403 # endif
404 #endif
405
406 #if EV_SELECT_IS_WINSOCKET
407 # include <winsock.h>
408 #endif
409
410 #if EV_USE_EVENTFD
411 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
412 # include <stdint.h>
413 # ifndef EFD_NONBLOCK
414 # define EFD_NONBLOCK O_NONBLOCK
415 # endif
416 # ifndef EFD_CLOEXEC
417 # ifdef O_CLOEXEC
418 # define EFD_CLOEXEC O_CLOEXEC
419 # else
420 # define EFD_CLOEXEC 02000000
421 # endif
422 # endif
423 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
424 #endif
425
426 #if EV_USE_SIGNALFD
427 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
428 # include <stdint.h>
429 # ifndef SFD_NONBLOCK
430 # define SFD_NONBLOCK O_NONBLOCK
431 # endif
432 # ifndef SFD_CLOEXEC
433 # ifdef O_CLOEXEC
434 # define SFD_CLOEXEC O_CLOEXEC
435 # else
436 # define SFD_CLOEXEC 02000000
437 # endif
438 # endif
439 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
440
441 struct signalfd_siginfo
442 {
443 uint32_t ssi_signo;
444 char pad[128 - sizeof (uint32_t)];
445 };
446 #endif
447
448 /**/
449
450 #if EV_VERIFY >= 3
451 # define EV_FREQUENT_CHECK ev_verify (EV_A)
452 #else
453 # define EV_FREQUENT_CHECK do { } while (0)
454 #endif
455
456 /*
457 * This is used to work around floating point rounding problems.
458 * This value is good at least till the year 4000.
459 */
460 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
461 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
462
463 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
464 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
465
466 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
467 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
468
469 #if __GNUC__ >= 4
470 # define expect(expr,value) __builtin_expect ((expr),(value))
471 # define noinline __attribute__ ((noinline))
472 #else
473 # define expect(expr,value) (expr)
474 # define noinline
475 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
476 # define inline
477 # endif
478 #endif
479
480 #define expect_false(expr) expect ((expr) != 0, 0)
481 #define expect_true(expr) expect ((expr) != 0, 1)
482 #define inline_size static inline
483
484 #if EV_FEATURE_CODE
485 # define inline_speed static inline
486 #else
487 # define inline_speed static noinline
488 #endif
489
490 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
491
492 #if EV_MINPRI == EV_MAXPRI
493 # define ABSPRI(w) (((W)w), 0)
494 #else
495 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
496 #endif
497
498 #define EMPTY /* required for microsofts broken pseudo-c compiler */
499 #define EMPTY2(a,b) /* used to suppress some warnings */
500
501 typedef ev_watcher *W;
502 typedef ev_watcher_list *WL;
503 typedef ev_watcher_time *WT;
504
505 #define ev_active(w) ((W)(w))->active
506 #define ev_at(w) ((WT)(w))->at
507
508 #if EV_USE_REALTIME
509 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
510 /* giving it a reasonably high chance of working on typical architectures */
511 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
512 #endif
513
514 #if EV_USE_MONOTONIC
515 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
516 #endif
517
518 #ifndef EV_FD_TO_WIN32_HANDLE
519 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
520 #endif
521 #ifndef EV_WIN32_HANDLE_TO_FD
522 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
523 #endif
524 #ifndef EV_WIN32_CLOSE_FD
525 # define EV_WIN32_CLOSE_FD(fd) close (fd)
526 #endif
527
528 #ifdef _WIN32
529 # include "ev_win32.c"
530 #endif
531
532 /*****************************************************************************/
533
534 /* define a suitable floor function (only used by periodics atm) */
535
536 #if EV_USE_FLOOR
537 # include <math.h>
538 # define ev_floor(v) floor (v)
539 #else
540
541 #include <float.h>
542
543 /* a floor() replacement function, should be independent of ev_tstamp type */
544 static ev_tstamp noinline
545 ev_floor (ev_tstamp v)
546 {
547 /* the choice of shift factor is not terribly important */
548 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
549 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
550 #else
551 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
552 #endif
553
554 /* argument too large for an unsigned long? */
555 if (expect_false (v >= shift))
556 {
557 ev_tstamp f;
558
559 if (v == v - 1.)
560 return v; /* very large number */
561
562 f = shift * ev_floor (v * (1. / shift));
563 return f + ev_floor (v - f);
564 }
565
566 /* special treatment for negative args? */
567 if (expect_false (v < 0.))
568 {
569 ev_tstamp f = -ev_floor (-v);
570
571 return f - (f == v ? 0 : 1);
572 }
573
574 /* fits into an unsigned long */
575 return (unsigned long)v;
576 }
577
578 #endif
579
580 /*****************************************************************************/
581
582 #ifdef __linux
583 # include <sys/utsname.h>
584 #endif
585
586 static unsigned int noinline
587 ev_linux_version (void)
588 {
589 #ifdef __linux
590 unsigned int v = 0;
591 struct utsname buf;
592 int i;
593 char *p = buf.release;
594
595 if (uname (&buf))
596 return 0;
597
598 for (i = 3+1; --i; )
599 {
600 unsigned int c = 0;
601
602 for (;;)
603 {
604 if (*p >= '0' && *p <= '9')
605 c = c * 10 + *p++ - '0';
606 else
607 {
608 p += *p == '.';
609 break;
610 }
611 }
612
613 v = (v << 8) | c;
614 }
615
616 return v;
617 #else
618 return 0;
619 #endif
620 }
621
622 /*****************************************************************************/
623
624 #if EV_AVOID_STDIO
625 static void noinline
626 ev_printerr (const char *msg)
627 {
628 write (STDERR_FILENO, msg, strlen (msg));
629 }
630 #endif
631
632 static void (*syserr_cb)(const char *msg);
633
634 void
635 ev_set_syserr_cb (void (*cb)(const char *msg))
636 {
637 syserr_cb = cb;
638 }
639
640 static void noinline
641 ev_syserr (const char *msg)
642 {
643 if (!msg)
644 msg = "(libev) system error";
645
646 if (syserr_cb)
647 syserr_cb (msg);
648 else
649 {
650 #if EV_AVOID_STDIO
651 ev_printerr (msg);
652 ev_printerr (": ");
653 ev_printerr (strerror (errno));
654 ev_printerr ("\n");
655 #else
656 perror (msg);
657 #endif
658 abort ();
659 }
660 }
661
662 static void *
663 ev_realloc_emul (void *ptr, long size)
664 {
665 #if __GLIBC__
666 return realloc (ptr, size);
667 #else
668 /* some systems, notably openbsd and darwin, fail to properly
669 * implement realloc (x, 0) (as required by both ansi c-89 and
670 * the single unix specification, so work around them here.
671 */
672
673 if (size)
674 return realloc (ptr, size);
675
676 free (ptr);
677 return 0;
678 #endif
679 }
680
681 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
682
683 void
684 ev_set_allocator (void *(*cb)(void *ptr, long size))
685 {
686 alloc = cb;
687 }
688
689 inline_speed void *
690 ev_realloc (void *ptr, long size)
691 {
692 ptr = alloc (ptr, size);
693
694 if (!ptr && size)
695 {
696 #if EV_AVOID_STDIO
697 ev_printerr ("(libev) memory allocation failed, aborting.\n");
698 #else
699 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
700 #endif
701 abort ();
702 }
703
704 return ptr;
705 }
706
707 #define ev_malloc(size) ev_realloc (0, (size))
708 #define ev_free(ptr) ev_realloc ((ptr), 0)
709
710 /*****************************************************************************/
711
712 /* set in reify when reification needed */
713 #define EV_ANFD_REIFY 1
714
715 /* file descriptor info structure */
716 typedef struct
717 {
718 WL head;
719 unsigned char events; /* the events watched for */
720 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
721 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
722 unsigned char unused;
723 #if EV_USE_EPOLL
724 unsigned int egen; /* generation counter to counter epoll bugs */
725 #endif
726 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
727 SOCKET handle;
728 #endif
729 #if EV_USE_IOCP
730 OVERLAPPED or, ow;
731 #endif
732 } ANFD;
733
734 /* stores the pending event set for a given watcher */
735 typedef struct
736 {
737 W w;
738 int events; /* the pending event set for the given watcher */
739 } ANPENDING;
740
741 #if EV_USE_INOTIFY
742 /* hash table entry per inotify-id */
743 typedef struct
744 {
745 WL head;
746 } ANFS;
747 #endif
748
749 /* Heap Entry */
750 #if EV_HEAP_CACHE_AT
751 /* a heap element */
752 typedef struct {
753 ev_tstamp at;
754 WT w;
755 } ANHE;
756
757 #define ANHE_w(he) (he).w /* access watcher, read-write */
758 #define ANHE_at(he) (he).at /* access cached at, read-only */
759 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
760 #else
761 /* a heap element */
762 typedef WT ANHE;
763
764 #define ANHE_w(he) (he)
765 #define ANHE_at(he) (he)->at
766 #define ANHE_at_cache(he)
767 #endif
768
769 #if EV_MULTIPLICITY
770
771 struct ev_loop
772 {
773 ev_tstamp ev_rt_now;
774 #define ev_rt_now ((loop)->ev_rt_now)
775 #define VAR(name,decl) decl;
776 #include "ev_vars.h"
777 #undef VAR
778 };
779 #include "ev_wrap.h"
780
781 static struct ev_loop default_loop_struct;
782 struct ev_loop *ev_default_loop_ptr;
783
784 #else
785
786 ev_tstamp ev_rt_now;
787 #define VAR(name,decl) static decl;
788 #include "ev_vars.h"
789 #undef VAR
790
791 static int ev_default_loop_ptr;
792
793 #endif
794
795 #if EV_FEATURE_API
796 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
797 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
798 # define EV_INVOKE_PENDING invoke_cb (EV_A)
799 #else
800 # define EV_RELEASE_CB (void)0
801 # define EV_ACQUIRE_CB (void)0
802 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
803 #endif
804
805 #define EVBREAK_RECURSE 0x80
806
807 /*****************************************************************************/
808
809 #ifndef EV_HAVE_EV_TIME
810 ev_tstamp
811 ev_time (void)
812 {
813 #if EV_USE_REALTIME
814 if (expect_true (have_realtime))
815 {
816 struct timespec ts;
817 clock_gettime (CLOCK_REALTIME, &ts);
818 return ts.tv_sec + ts.tv_nsec * 1e-9;
819 }
820 #endif
821
822 struct timeval tv;
823 gettimeofday (&tv, 0);
824 return tv.tv_sec + tv.tv_usec * 1e-6;
825 }
826 #endif
827
828 inline_size ev_tstamp
829 get_clock (void)
830 {
831 #if EV_USE_MONOTONIC
832 if (expect_true (have_monotonic))
833 {
834 struct timespec ts;
835 clock_gettime (CLOCK_MONOTONIC, &ts);
836 return ts.tv_sec + ts.tv_nsec * 1e-9;
837 }
838 #endif
839
840 return ev_time ();
841 }
842
843 #if EV_MULTIPLICITY
844 ev_tstamp
845 ev_now (EV_P)
846 {
847 return ev_rt_now;
848 }
849 #endif
850
851 void
852 ev_sleep (ev_tstamp delay)
853 {
854 if (delay > 0.)
855 {
856 #if EV_USE_NANOSLEEP
857 struct timespec ts;
858
859 EV_TS_SET (ts, delay);
860 nanosleep (&ts, 0);
861 #elif defined(_WIN32)
862 Sleep ((unsigned long)(delay * 1e3));
863 #else
864 struct timeval tv;
865
866 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
867 /* something not guaranteed by newer posix versions, but guaranteed */
868 /* by older ones */
869 EV_TV_SET (tv, delay);
870 select (0, 0, 0, 0, &tv);
871 #endif
872 }
873 }
874
875 /*****************************************************************************/
876
877 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
878
879 /* find a suitable new size for the given array, */
880 /* hopefully by rounding to a nice-to-malloc size */
881 inline_size int
882 array_nextsize (int elem, int cur, int cnt)
883 {
884 int ncur = cur + 1;
885
886 do
887 ncur <<= 1;
888 while (cnt > ncur);
889
890 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
891 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
892 {
893 ncur *= elem;
894 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
895 ncur = ncur - sizeof (void *) * 4;
896 ncur /= elem;
897 }
898
899 return ncur;
900 }
901
902 static noinline void *
903 array_realloc (int elem, void *base, int *cur, int cnt)
904 {
905 *cur = array_nextsize (elem, *cur, cnt);
906 return ev_realloc (base, elem * *cur);
907 }
908
909 #define array_init_zero(base,count) \
910 memset ((void *)(base), 0, sizeof (*(base)) * (count))
911
912 #define array_needsize(type,base,cur,cnt,init) \
913 if (expect_false ((cnt) > (cur))) \
914 { \
915 int ocur_ = (cur); \
916 (base) = (type *)array_realloc \
917 (sizeof (type), (base), &(cur), (cnt)); \
918 init ((base) + (ocur_), (cur) - ocur_); \
919 }
920
921 #if 0
922 #define array_slim(type,stem) \
923 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
924 { \
925 stem ## max = array_roundsize (stem ## cnt >> 1); \
926 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
927 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
928 }
929 #endif
930
931 #define array_free(stem, idx) \
932 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
933
934 /*****************************************************************************/
935
936 /* dummy callback for pending events */
937 static void noinline
938 pendingcb (EV_P_ ev_prepare *w, int revents)
939 {
940 }
941
942 void noinline
943 ev_feed_event (EV_P_ void *w, int revents)
944 {
945 W w_ = (W)w;
946 int pri = ABSPRI (w_);
947
948 if (expect_false (w_->pending))
949 pendings [pri][w_->pending - 1].events |= revents;
950 else
951 {
952 w_->pending = ++pendingcnt [pri];
953 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
954 pendings [pri][w_->pending - 1].w = w_;
955 pendings [pri][w_->pending - 1].events = revents;
956 }
957 }
958
959 inline_speed void
960 feed_reverse (EV_P_ W w)
961 {
962 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
963 rfeeds [rfeedcnt++] = w;
964 }
965
966 inline_size void
967 feed_reverse_done (EV_P_ int revents)
968 {
969 do
970 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
971 while (rfeedcnt);
972 }
973
974 inline_speed void
975 queue_events (EV_P_ W *events, int eventcnt, int type)
976 {
977 int i;
978
979 for (i = 0; i < eventcnt; ++i)
980 ev_feed_event (EV_A_ events [i], type);
981 }
982
983 /*****************************************************************************/
984
985 inline_speed void
986 fd_event_nocheck (EV_P_ int fd, int revents)
987 {
988 ANFD *anfd = anfds + fd;
989 ev_io *w;
990
991 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
992 {
993 int ev = w->events & revents;
994
995 if (ev)
996 ev_feed_event (EV_A_ (W)w, ev);
997 }
998 }
999
1000 /* do not submit kernel events for fds that have reify set */
1001 /* because that means they changed while we were polling for new events */
1002 inline_speed void
1003 fd_event (EV_P_ int fd, int revents)
1004 {
1005 ANFD *anfd = anfds + fd;
1006
1007 if (expect_true (!anfd->reify))
1008 fd_event_nocheck (EV_A_ fd, revents);
1009 }
1010
1011 void
1012 ev_feed_fd_event (EV_P_ int fd, int revents)
1013 {
1014 if (fd >= 0 && fd < anfdmax)
1015 fd_event_nocheck (EV_A_ fd, revents);
1016 }
1017
1018 /* make sure the external fd watch events are in-sync */
1019 /* with the kernel/libev internal state */
1020 inline_size void
1021 fd_reify (EV_P)
1022 {
1023 int i;
1024
1025 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1026 for (i = 0; i < fdchangecnt; ++i)
1027 {
1028 int fd = fdchanges [i];
1029 ANFD *anfd = anfds + fd;
1030
1031 if (anfd->reify & EV__IOFDSET && anfd->head)
1032 {
1033 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1034
1035 if (handle != anfd->handle)
1036 {
1037 unsigned long arg;
1038
1039 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1040
1041 /* handle changed, but fd didn't - we need to do it in two steps */
1042 backend_modify (EV_A_ fd, anfd->events, 0);
1043 anfd->events = 0;
1044 anfd->handle = handle;
1045 }
1046 }
1047 }
1048 #endif
1049
1050 for (i = 0; i < fdchangecnt; ++i)
1051 {
1052 int fd = fdchanges [i];
1053 ANFD *anfd = anfds + fd;
1054 ev_io *w;
1055
1056 unsigned char o_events = anfd->events;
1057 unsigned char o_reify = anfd->reify;
1058
1059 anfd->reify = 0;
1060
1061 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1062 {
1063 anfd->events = 0;
1064
1065 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1066 anfd->events |= (unsigned char)w->events;
1067
1068 if (o_events != anfd->events)
1069 o_reify = EV__IOFDSET; /* actually |= */
1070 }
1071
1072 if (o_reify & EV__IOFDSET)
1073 backend_modify (EV_A_ fd, o_events, anfd->events);
1074 }
1075
1076 fdchangecnt = 0;
1077 }
1078
1079 /* something about the given fd changed */
1080 inline_size void
1081 fd_change (EV_P_ int fd, int flags)
1082 {
1083 unsigned char reify = anfds [fd].reify;
1084 anfds [fd].reify |= flags;
1085
1086 if (expect_true (!reify))
1087 {
1088 ++fdchangecnt;
1089 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1090 fdchanges [fdchangecnt - 1] = fd;
1091 }
1092 }
1093
1094 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1095 inline_speed void
1096 fd_kill (EV_P_ int fd)
1097 {
1098 ev_io *w;
1099
1100 while ((w = (ev_io *)anfds [fd].head))
1101 {
1102 ev_io_stop (EV_A_ w);
1103 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1104 }
1105 }
1106
1107 /* check whether the given fd is actually valid, for error recovery */
1108 inline_size int
1109 fd_valid (int fd)
1110 {
1111 #ifdef _WIN32
1112 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1113 #else
1114 return fcntl (fd, F_GETFD) != -1;
1115 #endif
1116 }
1117
1118 /* called on EBADF to verify fds */
1119 static void noinline
1120 fd_ebadf (EV_P)
1121 {
1122 int fd;
1123
1124 for (fd = 0; fd < anfdmax; ++fd)
1125 if (anfds [fd].events)
1126 if (!fd_valid (fd) && errno == EBADF)
1127 fd_kill (EV_A_ fd);
1128 }
1129
1130 /* called on ENOMEM in select/poll to kill some fds and retry */
1131 static void noinline
1132 fd_enomem (EV_P)
1133 {
1134 int fd;
1135
1136 for (fd = anfdmax; fd--; )
1137 if (anfds [fd].events)
1138 {
1139 fd_kill (EV_A_ fd);
1140 break;
1141 }
1142 }
1143
1144 /* usually called after fork if backend needs to re-arm all fds from scratch */
1145 static void noinline
1146 fd_rearm_all (EV_P)
1147 {
1148 int fd;
1149
1150 for (fd = 0; fd < anfdmax; ++fd)
1151 if (anfds [fd].events)
1152 {
1153 anfds [fd].events = 0;
1154 anfds [fd].emask = 0;
1155 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1156 }
1157 }
1158
1159 /* used to prepare libev internal fd's */
1160 /* this is not fork-safe */
1161 inline_speed void
1162 fd_intern (int fd)
1163 {
1164 #ifdef _WIN32
1165 unsigned long arg = 1;
1166 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1167 #else
1168 fcntl (fd, F_SETFD, FD_CLOEXEC);
1169 fcntl (fd, F_SETFL, O_NONBLOCK);
1170 #endif
1171 }
1172
1173 /*****************************************************************************/
1174
1175 /*
1176 * the heap functions want a real array index. array index 0 is guaranteed to not
1177 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1178 * the branching factor of the d-tree.
1179 */
1180
1181 /*
1182 * at the moment we allow libev the luxury of two heaps,
1183 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1184 * which is more cache-efficient.
1185 * the difference is about 5% with 50000+ watchers.
1186 */
1187 #if EV_USE_4HEAP
1188
1189 #define DHEAP 4
1190 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1191 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1192 #define UPHEAP_DONE(p,k) ((p) == (k))
1193
1194 /* away from the root */
1195 inline_speed void
1196 downheap (ANHE *heap, int N, int k)
1197 {
1198 ANHE he = heap [k];
1199 ANHE *E = heap + N + HEAP0;
1200
1201 for (;;)
1202 {
1203 ev_tstamp minat;
1204 ANHE *minpos;
1205 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1206
1207 /* find minimum child */
1208 if (expect_true (pos + DHEAP - 1 < E))
1209 {
1210 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1211 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1212 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1213 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1214 }
1215 else if (pos < E)
1216 {
1217 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1218 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1219 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1220 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1221 }
1222 else
1223 break;
1224
1225 if (ANHE_at (he) <= minat)
1226 break;
1227
1228 heap [k] = *minpos;
1229 ev_active (ANHE_w (*minpos)) = k;
1230
1231 k = minpos - heap;
1232 }
1233
1234 heap [k] = he;
1235 ev_active (ANHE_w (he)) = k;
1236 }
1237
1238 #else /* 4HEAP */
1239
1240 #define HEAP0 1
1241 #define HPARENT(k) ((k) >> 1)
1242 #define UPHEAP_DONE(p,k) (!(p))
1243
1244 /* away from the root */
1245 inline_speed void
1246 downheap (ANHE *heap, int N, int k)
1247 {
1248 ANHE he = heap [k];
1249
1250 for (;;)
1251 {
1252 int c = k << 1;
1253
1254 if (c >= N + HEAP0)
1255 break;
1256
1257 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1258 ? 1 : 0;
1259
1260 if (ANHE_at (he) <= ANHE_at (heap [c]))
1261 break;
1262
1263 heap [k] = heap [c];
1264 ev_active (ANHE_w (heap [k])) = k;
1265
1266 k = c;
1267 }
1268
1269 heap [k] = he;
1270 ev_active (ANHE_w (he)) = k;
1271 }
1272 #endif
1273
1274 /* towards the root */
1275 inline_speed void
1276 upheap (ANHE *heap, int k)
1277 {
1278 ANHE he = heap [k];
1279
1280 for (;;)
1281 {
1282 int p = HPARENT (k);
1283
1284 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1285 break;
1286
1287 heap [k] = heap [p];
1288 ev_active (ANHE_w (heap [k])) = k;
1289 k = p;
1290 }
1291
1292 heap [k] = he;
1293 ev_active (ANHE_w (he)) = k;
1294 }
1295
1296 /* move an element suitably so it is in a correct place */
1297 inline_size void
1298 adjustheap (ANHE *heap, int N, int k)
1299 {
1300 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1301 upheap (heap, k);
1302 else
1303 downheap (heap, N, k);
1304 }
1305
1306 /* rebuild the heap: this function is used only once and executed rarely */
1307 inline_size void
1308 reheap (ANHE *heap, int N)
1309 {
1310 int i;
1311
1312 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1313 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1314 for (i = 0; i < N; ++i)
1315 upheap (heap, i + HEAP0);
1316 }
1317
1318 /*****************************************************************************/
1319
1320 /* associate signal watchers to a signal signal */
1321 typedef struct
1322 {
1323 EV_ATOMIC_T pending;
1324 #if EV_MULTIPLICITY
1325 EV_P;
1326 #endif
1327 WL head;
1328 } ANSIG;
1329
1330 static ANSIG signals [EV_NSIG - 1];
1331
1332 /*****************************************************************************/
1333
1334 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1335
1336 static void noinline
1337 evpipe_init (EV_P)
1338 {
1339 if (!ev_is_active (&pipe_w))
1340 {
1341 # if EV_USE_EVENTFD
1342 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1343 if (evfd < 0 && errno == EINVAL)
1344 evfd = eventfd (0, 0);
1345
1346 if (evfd >= 0)
1347 {
1348 evpipe [0] = -1;
1349 fd_intern (evfd); /* doing it twice doesn't hurt */
1350 ev_io_set (&pipe_w, evfd, EV_READ);
1351 }
1352 else
1353 # endif
1354 {
1355 while (pipe (evpipe))
1356 ev_syserr ("(libev) error creating signal/async pipe");
1357
1358 fd_intern (evpipe [0]);
1359 fd_intern (evpipe [1]);
1360 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1361 }
1362
1363 ev_io_start (EV_A_ &pipe_w);
1364 ev_unref (EV_A); /* watcher should not keep loop alive */
1365 }
1366 }
1367
1368 inline_size void
1369 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1370 {
1371 if (!*flag)
1372 {
1373 *flag = 1;
1374
1375 pipe_write_skipped = 1;
1376
1377 if (pipe_write_wanted)
1378 {
1379 int old_errno = errno; /* save errno because write will clobber it */
1380 char dummy;
1381
1382 pipe_write_skipped = 0;
1383
1384 #if EV_USE_EVENTFD
1385 if (evfd >= 0)
1386 {
1387 uint64_t counter = 1;
1388 write (evfd, &counter, sizeof (uint64_t));
1389 }
1390 else
1391 #endif
1392 {
1393 /* win32 people keep sending patches that change this write() to send() */
1394 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1395 /* so when you think this write should be a send instead, please find out */
1396 /* where your send() is from - it's definitely not the microsoft send, and */
1397 /* tell me. thank you. */
1398 write (evpipe [1], &dummy, 1);
1399 }
1400
1401 errno = old_errno;
1402 }
1403 }
1404 }
1405
1406 /* called whenever the libev signal pipe */
1407 /* got some events (signal, async) */
1408 static void
1409 pipecb (EV_P_ ev_io *iow, int revents)
1410 {
1411 int i;
1412
1413 if (revents & EV_READ)
1414 {
1415 #if EV_USE_EVENTFD
1416 if (evfd >= 0)
1417 {
1418 uint64_t counter;
1419 read (evfd, &counter, sizeof (uint64_t));
1420 }
1421 else
1422 #endif
1423 {
1424 char dummy;
1425 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1426 read (evpipe [0], &dummy, 1);
1427 }
1428 }
1429
1430 pipe_write_skipped = 0;
1431
1432 #if EV_SIGNAL_ENABLE
1433 if (sig_pending)
1434 {
1435 sig_pending = 0;
1436
1437 for (i = EV_NSIG - 1; i--; )
1438 if (expect_false (signals [i].pending))
1439 ev_feed_signal_event (EV_A_ i + 1);
1440 }
1441 #endif
1442
1443 #if EV_ASYNC_ENABLE
1444 if (async_pending)
1445 {
1446 async_pending = 0;
1447
1448 for (i = asynccnt; i--; )
1449 if (asyncs [i]->sent)
1450 {
1451 asyncs [i]->sent = 0;
1452 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1453 }
1454 }
1455 #endif
1456 }
1457
1458 /*****************************************************************************/
1459
1460 void
1461 ev_feed_signal (int signum)
1462 {
1463 #if EV_MULTIPLICITY
1464 EV_P = signals [signum - 1].loop;
1465
1466 if (!EV_A)
1467 return;
1468 #endif
1469
1470 evpipe_init (EV_A);
1471
1472 signals [signum - 1].pending = 1;
1473 evpipe_write (EV_A_ &sig_pending);
1474 }
1475
1476 static void
1477 ev_sighandler (int signum)
1478 {
1479 #ifdef _WIN32
1480 signal (signum, ev_sighandler);
1481 #endif
1482
1483 ev_feed_signal (signum);
1484 }
1485
1486 void noinline
1487 ev_feed_signal_event (EV_P_ int signum)
1488 {
1489 WL w;
1490
1491 if (expect_false (signum <= 0 || signum > EV_NSIG))
1492 return;
1493
1494 --signum;
1495
1496 #if EV_MULTIPLICITY
1497 /* it is permissible to try to feed a signal to the wrong loop */
1498 /* or, likely more useful, feeding a signal nobody is waiting for */
1499
1500 if (expect_false (signals [signum].loop != EV_A))
1501 return;
1502 #endif
1503
1504 signals [signum].pending = 0;
1505
1506 for (w = signals [signum].head; w; w = w->next)
1507 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1508 }
1509
1510 #if EV_USE_SIGNALFD
1511 static void
1512 sigfdcb (EV_P_ ev_io *iow, int revents)
1513 {
1514 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1515
1516 for (;;)
1517 {
1518 ssize_t res = read (sigfd, si, sizeof (si));
1519
1520 /* not ISO-C, as res might be -1, but works with SuS */
1521 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1522 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1523
1524 if (res < (ssize_t)sizeof (si))
1525 break;
1526 }
1527 }
1528 #endif
1529
1530 #endif
1531
1532 /*****************************************************************************/
1533
1534 #if EV_CHILD_ENABLE
1535 static WL childs [EV_PID_HASHSIZE];
1536
1537 static ev_signal childev;
1538
1539 #ifndef WIFCONTINUED
1540 # define WIFCONTINUED(status) 0
1541 #endif
1542
1543 /* handle a single child status event */
1544 inline_speed void
1545 child_reap (EV_P_ int chain, int pid, int status)
1546 {
1547 ev_child *w;
1548 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1549
1550 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1551 {
1552 if ((w->pid == pid || !w->pid)
1553 && (!traced || (w->flags & 1)))
1554 {
1555 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1556 w->rpid = pid;
1557 w->rstatus = status;
1558 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1559 }
1560 }
1561 }
1562
1563 #ifndef WCONTINUED
1564 # define WCONTINUED 0
1565 #endif
1566
1567 /* called on sigchld etc., calls waitpid */
1568 static void
1569 childcb (EV_P_ ev_signal *sw, int revents)
1570 {
1571 int pid, status;
1572
1573 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1574 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1575 if (!WCONTINUED
1576 || errno != EINVAL
1577 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1578 return;
1579
1580 /* make sure we are called again until all children have been reaped */
1581 /* we need to do it this way so that the callback gets called before we continue */
1582 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1583
1584 child_reap (EV_A_ pid, pid, status);
1585 if ((EV_PID_HASHSIZE) > 1)
1586 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1587 }
1588
1589 #endif
1590
1591 /*****************************************************************************/
1592
1593 #if EV_USE_IOCP
1594 # include "ev_iocp.c"
1595 #endif
1596 #if EV_USE_PORT
1597 # include "ev_port.c"
1598 #endif
1599 #if EV_USE_KQUEUE
1600 # include "ev_kqueue.c"
1601 #endif
1602 #if EV_USE_EPOLL
1603 # include "ev_epoll.c"
1604 #endif
1605 #if EV_USE_POLL
1606 # include "ev_poll.c"
1607 #endif
1608 #if EV_USE_SELECT
1609 # include "ev_select.c"
1610 #endif
1611
1612 int
1613 ev_version_major (void)
1614 {
1615 return EV_VERSION_MAJOR;
1616 }
1617
1618 int
1619 ev_version_minor (void)
1620 {
1621 return EV_VERSION_MINOR;
1622 }
1623
1624 /* return true if we are running with elevated privileges and should ignore env variables */
1625 int inline_size
1626 enable_secure (void)
1627 {
1628 #ifdef _WIN32
1629 return 0;
1630 #else
1631 return getuid () != geteuid ()
1632 || getgid () != getegid ();
1633 #endif
1634 }
1635
1636 unsigned int
1637 ev_supported_backends (void)
1638 {
1639 unsigned int flags = 0;
1640
1641 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1642 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1643 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1644 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1645 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1646
1647 return flags;
1648 }
1649
1650 unsigned int
1651 ev_recommended_backends (void)
1652 {
1653 unsigned int flags = ev_supported_backends ();
1654
1655 #ifndef __NetBSD__
1656 /* kqueue is borked on everything but netbsd apparently */
1657 /* it usually doesn't work correctly on anything but sockets and pipes */
1658 flags &= ~EVBACKEND_KQUEUE;
1659 #endif
1660 #ifdef __APPLE__
1661 /* only select works correctly on that "unix-certified" platform */
1662 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1663 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1664 #endif
1665 #ifdef __FreeBSD__
1666 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1667 #endif
1668
1669 return flags;
1670 }
1671
1672 unsigned int
1673 ev_embeddable_backends (void)
1674 {
1675 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1676
1677 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1678 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1679 flags &= ~EVBACKEND_EPOLL;
1680
1681 return flags;
1682 }
1683
1684 unsigned int
1685 ev_backend (EV_P)
1686 {
1687 return backend;
1688 }
1689
1690 #if EV_FEATURE_API
1691 unsigned int
1692 ev_iteration (EV_P)
1693 {
1694 return loop_count;
1695 }
1696
1697 unsigned int
1698 ev_depth (EV_P)
1699 {
1700 return loop_depth;
1701 }
1702
1703 void
1704 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1705 {
1706 io_blocktime = interval;
1707 }
1708
1709 void
1710 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1711 {
1712 timeout_blocktime = interval;
1713 }
1714
1715 void
1716 ev_set_userdata (EV_P_ void *data)
1717 {
1718 userdata = data;
1719 }
1720
1721 void *
1722 ev_userdata (EV_P)
1723 {
1724 return userdata;
1725 }
1726
1727 void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1728 {
1729 invoke_cb = invoke_pending_cb;
1730 }
1731
1732 void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1733 {
1734 release_cb = release;
1735 acquire_cb = acquire;
1736 }
1737 #endif
1738
1739 /* initialise a loop structure, must be zero-initialised */
1740 static void noinline
1741 loop_init (EV_P_ unsigned int flags)
1742 {
1743 if (!backend)
1744 {
1745 origflags = flags;
1746
1747 #if EV_USE_REALTIME
1748 if (!have_realtime)
1749 {
1750 struct timespec ts;
1751
1752 if (!clock_gettime (CLOCK_REALTIME, &ts))
1753 have_realtime = 1;
1754 }
1755 #endif
1756
1757 #if EV_USE_MONOTONIC
1758 if (!have_monotonic)
1759 {
1760 struct timespec ts;
1761
1762 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1763 have_monotonic = 1;
1764 }
1765 #endif
1766
1767 /* pid check not overridable via env */
1768 #ifndef _WIN32
1769 if (flags & EVFLAG_FORKCHECK)
1770 curpid = getpid ();
1771 #endif
1772
1773 if (!(flags & EVFLAG_NOENV)
1774 && !enable_secure ()
1775 && getenv ("LIBEV_FLAGS"))
1776 flags = atoi (getenv ("LIBEV_FLAGS"));
1777
1778 ev_rt_now = ev_time ();
1779 mn_now = get_clock ();
1780 now_floor = mn_now;
1781 rtmn_diff = ev_rt_now - mn_now;
1782 #if EV_FEATURE_API
1783 invoke_cb = ev_invoke_pending;
1784 #endif
1785
1786 io_blocktime = 0.;
1787 timeout_blocktime = 0.;
1788 backend = 0;
1789 backend_fd = -1;
1790 sig_pending = 0;
1791 #if EV_ASYNC_ENABLE
1792 async_pending = 0;
1793 #endif
1794 pipe_write_skipped = 0;
1795 pipe_write_wanted = 0;
1796 #if EV_USE_INOTIFY
1797 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1798 #endif
1799 #if EV_USE_SIGNALFD
1800 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1801 #endif
1802
1803 if (!(flags & EVBACKEND_MASK))
1804 flags |= ev_recommended_backends ();
1805
1806 #if EV_USE_IOCP
1807 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1808 #endif
1809 #if EV_USE_PORT
1810 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1811 #endif
1812 #if EV_USE_KQUEUE
1813 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1814 #endif
1815 #if EV_USE_EPOLL
1816 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1817 #endif
1818 #if EV_USE_POLL
1819 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1820 #endif
1821 #if EV_USE_SELECT
1822 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1823 #endif
1824
1825 ev_prepare_init (&pending_w, pendingcb);
1826
1827 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1828 ev_init (&pipe_w, pipecb);
1829 ev_set_priority (&pipe_w, EV_MAXPRI);
1830 #endif
1831 }
1832 }
1833
1834 /* free up a loop structure */
1835 void
1836 ev_loop_destroy (EV_P)
1837 {
1838 int i;
1839
1840 #if EV_MULTIPLICITY
1841 /* mimic free (0) */
1842 if (!EV_A)
1843 return;
1844 #endif
1845
1846 #if EV_CLEANUP_ENABLE
1847 /* queue cleanup watchers (and execute them) */
1848 if (expect_false (cleanupcnt))
1849 {
1850 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1851 EV_INVOKE_PENDING;
1852 }
1853 #endif
1854
1855 #if EV_CHILD_ENABLE
1856 if (ev_is_active (&childev))
1857 {
1858 ev_ref (EV_A); /* child watcher */
1859 ev_signal_stop (EV_A_ &childev);
1860 }
1861 #endif
1862
1863 if (ev_is_active (&pipe_w))
1864 {
1865 /*ev_ref (EV_A);*/
1866 /*ev_io_stop (EV_A_ &pipe_w);*/
1867
1868 #if EV_USE_EVENTFD
1869 if (evfd >= 0)
1870 close (evfd);
1871 #endif
1872
1873 if (evpipe [0] >= 0)
1874 {
1875 EV_WIN32_CLOSE_FD (evpipe [0]);
1876 EV_WIN32_CLOSE_FD (evpipe [1]);
1877 }
1878 }
1879
1880 #if EV_USE_SIGNALFD
1881 if (ev_is_active (&sigfd_w))
1882 close (sigfd);
1883 #endif
1884
1885 #if EV_USE_INOTIFY
1886 if (fs_fd >= 0)
1887 close (fs_fd);
1888 #endif
1889
1890 if (backend_fd >= 0)
1891 close (backend_fd);
1892
1893 #if EV_USE_IOCP
1894 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1895 #endif
1896 #if EV_USE_PORT
1897 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1898 #endif
1899 #if EV_USE_KQUEUE
1900 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1901 #endif
1902 #if EV_USE_EPOLL
1903 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1904 #endif
1905 #if EV_USE_POLL
1906 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1907 #endif
1908 #if EV_USE_SELECT
1909 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1910 #endif
1911
1912 for (i = NUMPRI; i--; )
1913 {
1914 array_free (pending, [i]);
1915 #if EV_IDLE_ENABLE
1916 array_free (idle, [i]);
1917 #endif
1918 }
1919
1920 ev_free (anfds); anfds = 0; anfdmax = 0;
1921
1922 /* have to use the microsoft-never-gets-it-right macro */
1923 array_free (rfeed, EMPTY);
1924 array_free (fdchange, EMPTY);
1925 array_free (timer, EMPTY);
1926 #if EV_PERIODIC_ENABLE
1927 array_free (periodic, EMPTY);
1928 #endif
1929 #if EV_FORK_ENABLE
1930 array_free (fork, EMPTY);
1931 #endif
1932 #if EV_CLEANUP_ENABLE
1933 array_free (cleanup, EMPTY);
1934 #endif
1935 array_free (prepare, EMPTY);
1936 array_free (check, EMPTY);
1937 #if EV_ASYNC_ENABLE
1938 array_free (async, EMPTY);
1939 #endif
1940
1941 backend = 0;
1942
1943 #if EV_MULTIPLICITY
1944 if (ev_is_default_loop (EV_A))
1945 #endif
1946 ev_default_loop_ptr = 0;
1947 #if EV_MULTIPLICITY
1948 else
1949 ev_free (EV_A);
1950 #endif
1951 }
1952
1953 #if EV_USE_INOTIFY
1954 inline_size void infy_fork (EV_P);
1955 #endif
1956
1957 inline_size void
1958 loop_fork (EV_P)
1959 {
1960 #if EV_USE_PORT
1961 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1962 #endif
1963 #if EV_USE_KQUEUE
1964 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1965 #endif
1966 #if EV_USE_EPOLL
1967 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1968 #endif
1969 #if EV_USE_INOTIFY
1970 infy_fork (EV_A);
1971 #endif
1972
1973 if (ev_is_active (&pipe_w))
1974 {
1975 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
1976
1977 ev_ref (EV_A);
1978 ev_io_stop (EV_A_ &pipe_w);
1979
1980 #if EV_USE_EVENTFD
1981 if (evfd >= 0)
1982 close (evfd);
1983 #endif
1984
1985 if (evpipe [0] >= 0)
1986 {
1987 EV_WIN32_CLOSE_FD (evpipe [0]);
1988 EV_WIN32_CLOSE_FD (evpipe [1]);
1989 }
1990
1991 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1992 evpipe_init (EV_A);
1993 /* now iterate over everything, in case we missed something */
1994 pipecb (EV_A_ &pipe_w, EV_READ);
1995 #endif
1996 }
1997
1998 postfork = 0;
1999 }
2000
2001 #if EV_MULTIPLICITY
2002
2003 struct ev_loop *
2004 ev_loop_new (unsigned int flags)
2005 {
2006 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2007
2008 memset (EV_A, 0, sizeof (struct ev_loop));
2009 loop_init (EV_A_ flags);
2010
2011 if (ev_backend (EV_A))
2012 return EV_A;
2013
2014 ev_free (EV_A);
2015 return 0;
2016 }
2017
2018 #endif /* multiplicity */
2019
2020 #if EV_VERIFY
2021 static void noinline
2022 verify_watcher (EV_P_ W w)
2023 {
2024 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2025
2026 if (w->pending)
2027 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2028 }
2029
2030 static void noinline
2031 verify_heap (EV_P_ ANHE *heap, int N)
2032 {
2033 int i;
2034
2035 for (i = HEAP0; i < N + HEAP0; ++i)
2036 {
2037 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2038 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2039 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2040
2041 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2042 }
2043 }
2044
2045 static void noinline
2046 array_verify (EV_P_ W *ws, int cnt)
2047 {
2048 while (cnt--)
2049 {
2050 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2051 verify_watcher (EV_A_ ws [cnt]);
2052 }
2053 }
2054 #endif
2055
2056 #if EV_FEATURE_API
2057 void
2058 ev_verify (EV_P)
2059 {
2060 #if EV_VERIFY
2061 int i;
2062 WL w;
2063
2064 assert (activecnt >= -1);
2065
2066 assert (fdchangemax >= fdchangecnt);
2067 for (i = 0; i < fdchangecnt; ++i)
2068 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2069
2070 assert (anfdmax >= 0);
2071 for (i = 0; i < anfdmax; ++i)
2072 for (w = anfds [i].head; w; w = w->next)
2073 {
2074 verify_watcher (EV_A_ (W)w);
2075 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2076 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2077 }
2078
2079 assert (timermax >= timercnt);
2080 verify_heap (EV_A_ timers, timercnt);
2081
2082 #if EV_PERIODIC_ENABLE
2083 assert (periodicmax >= periodiccnt);
2084 verify_heap (EV_A_ periodics, periodiccnt);
2085 #endif
2086
2087 for (i = NUMPRI; i--; )
2088 {
2089 assert (pendingmax [i] >= pendingcnt [i]);
2090 #if EV_IDLE_ENABLE
2091 assert (idleall >= 0);
2092 assert (idlemax [i] >= idlecnt [i]);
2093 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2094 #endif
2095 }
2096
2097 #if EV_FORK_ENABLE
2098 assert (forkmax >= forkcnt);
2099 array_verify (EV_A_ (W *)forks, forkcnt);
2100 #endif
2101
2102 #if EV_CLEANUP_ENABLE
2103 assert (cleanupmax >= cleanupcnt);
2104 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2105 #endif
2106
2107 #if EV_ASYNC_ENABLE
2108 assert (asyncmax >= asynccnt);
2109 array_verify (EV_A_ (W *)asyncs, asynccnt);
2110 #endif
2111
2112 #if EV_PREPARE_ENABLE
2113 assert (preparemax >= preparecnt);
2114 array_verify (EV_A_ (W *)prepares, preparecnt);
2115 #endif
2116
2117 #if EV_CHECK_ENABLE
2118 assert (checkmax >= checkcnt);
2119 array_verify (EV_A_ (W *)checks, checkcnt);
2120 #endif
2121
2122 # if 0
2123 #if EV_CHILD_ENABLE
2124 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2125 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2126 #endif
2127 # endif
2128 #endif
2129 }
2130 #endif
2131
2132 #if EV_MULTIPLICITY
2133 struct ev_loop *
2134 #else
2135 int
2136 #endif
2137 ev_default_loop (unsigned int flags)
2138 {
2139 if (!ev_default_loop_ptr)
2140 {
2141 #if EV_MULTIPLICITY
2142 EV_P = ev_default_loop_ptr = &default_loop_struct;
2143 #else
2144 ev_default_loop_ptr = 1;
2145 #endif
2146
2147 loop_init (EV_A_ flags);
2148
2149 if (ev_backend (EV_A))
2150 {
2151 #if EV_CHILD_ENABLE
2152 ev_signal_init (&childev, childcb, SIGCHLD);
2153 ev_set_priority (&childev, EV_MAXPRI);
2154 ev_signal_start (EV_A_ &childev);
2155 ev_unref (EV_A); /* child watcher should not keep loop alive */
2156 #endif
2157 }
2158 else
2159 ev_default_loop_ptr = 0;
2160 }
2161
2162 return ev_default_loop_ptr;
2163 }
2164
2165 void
2166 ev_loop_fork (EV_P)
2167 {
2168 postfork = 1; /* must be in line with ev_default_fork */
2169 }
2170
2171 /*****************************************************************************/
2172
2173 void
2174 ev_invoke (EV_P_ void *w, int revents)
2175 {
2176 EV_CB_INVOKE ((W)w, revents);
2177 }
2178
2179 unsigned int
2180 ev_pending_count (EV_P)
2181 {
2182 int pri;
2183 unsigned int count = 0;
2184
2185 for (pri = NUMPRI; pri--; )
2186 count += pendingcnt [pri];
2187
2188 return count;
2189 }
2190
2191 void noinline
2192 ev_invoke_pending (EV_P)
2193 {
2194 int pri;
2195
2196 for (pri = NUMPRI; pri--; )
2197 while (pendingcnt [pri])
2198 {
2199 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2200
2201 p->w->pending = 0;
2202 EV_CB_INVOKE (p->w, p->events);
2203 EV_FREQUENT_CHECK;
2204 }
2205 }
2206
2207 #if EV_IDLE_ENABLE
2208 /* make idle watchers pending. this handles the "call-idle */
2209 /* only when higher priorities are idle" logic */
2210 inline_size void
2211 idle_reify (EV_P)
2212 {
2213 if (expect_false (idleall))
2214 {
2215 int pri;
2216
2217 for (pri = NUMPRI; pri--; )
2218 {
2219 if (pendingcnt [pri])
2220 break;
2221
2222 if (idlecnt [pri])
2223 {
2224 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2225 break;
2226 }
2227 }
2228 }
2229 }
2230 #endif
2231
2232 /* make timers pending */
2233 inline_size void
2234 timers_reify (EV_P)
2235 {
2236 EV_FREQUENT_CHECK;
2237
2238 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2239 {
2240 do
2241 {
2242 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2243
2244 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2245
2246 /* first reschedule or stop timer */
2247 if (w->repeat)
2248 {
2249 ev_at (w) += w->repeat;
2250 if (ev_at (w) < mn_now)
2251 ev_at (w) = mn_now;
2252
2253 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2254
2255 ANHE_at_cache (timers [HEAP0]);
2256 downheap (timers, timercnt, HEAP0);
2257 }
2258 else
2259 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2260
2261 EV_FREQUENT_CHECK;
2262 feed_reverse (EV_A_ (W)w);
2263 }
2264 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2265
2266 feed_reverse_done (EV_A_ EV_TIMER);
2267 }
2268 }
2269
2270 #if EV_PERIODIC_ENABLE
2271
2272 static void noinline
2273 periodic_recalc (EV_P_ ev_periodic *w)
2274 {
2275 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2276 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2277
2278 /* the above almost always errs on the low side */
2279 while (at <= ev_rt_now)
2280 {
2281 ev_tstamp nat = at + w->interval;
2282
2283 /* when resolution fails us, we use ev_rt_now */
2284 if (expect_false (nat == at))
2285 {
2286 at = ev_rt_now;
2287 break;
2288 }
2289
2290 at = nat;
2291 }
2292
2293 ev_at (w) = at;
2294 }
2295
2296 /* make periodics pending */
2297 inline_size void
2298 periodics_reify (EV_P)
2299 {
2300 EV_FREQUENT_CHECK;
2301
2302 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2303 {
2304 int feed_count = 0;
2305
2306 do
2307 {
2308 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2309
2310 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2311
2312 /* first reschedule or stop timer */
2313 if (w->reschedule_cb)
2314 {
2315 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2316
2317 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2318
2319 ANHE_at_cache (periodics [HEAP0]);
2320 downheap (periodics, periodiccnt, HEAP0);
2321 }
2322 else if (w->interval)
2323 {
2324 periodic_recalc (EV_A_ w);
2325 ANHE_at_cache (periodics [HEAP0]);
2326 downheap (periodics, periodiccnt, HEAP0);
2327 }
2328 else
2329 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2330
2331 EV_FREQUENT_CHECK;
2332 feed_reverse (EV_A_ (W)w);
2333 }
2334 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2335
2336 feed_reverse_done (EV_A_ EV_PERIODIC);
2337 }
2338 }
2339
2340 /* simply recalculate all periodics */
2341 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2342 static void noinline
2343 periodics_reschedule (EV_P)
2344 {
2345 int i;
2346
2347 /* adjust periodics after time jump */
2348 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2349 {
2350 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2351
2352 if (w->reschedule_cb)
2353 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2354 else if (w->interval)
2355 periodic_recalc (EV_A_ w);
2356
2357 ANHE_at_cache (periodics [i]);
2358 }
2359
2360 reheap (periodics, periodiccnt);
2361 }
2362 #endif
2363
2364 /* adjust all timers by a given offset */
2365 static void noinline
2366 timers_reschedule (EV_P_ ev_tstamp adjust)
2367 {
2368 int i;
2369
2370 for (i = 0; i < timercnt; ++i)
2371 {
2372 ANHE *he = timers + i + HEAP0;
2373 ANHE_w (*he)->at += adjust;
2374 ANHE_at_cache (*he);
2375 }
2376 }
2377
2378 /* fetch new monotonic and realtime times from the kernel */
2379 /* also detect if there was a timejump, and act accordingly */
2380 inline_speed void
2381 time_update (EV_P_ ev_tstamp max_block)
2382 {
2383 #if EV_USE_MONOTONIC
2384 if (expect_true (have_monotonic))
2385 {
2386 int i;
2387 ev_tstamp odiff = rtmn_diff;
2388
2389 mn_now = get_clock ();
2390
2391 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2392 /* interpolate in the meantime */
2393 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2394 {
2395 ev_rt_now = rtmn_diff + mn_now;
2396 return;
2397 }
2398
2399 now_floor = mn_now;
2400 ev_rt_now = ev_time ();
2401
2402 /* loop a few times, before making important decisions.
2403 * on the choice of "4": one iteration isn't enough,
2404 * in case we get preempted during the calls to
2405 * ev_time and get_clock. a second call is almost guaranteed
2406 * to succeed in that case, though. and looping a few more times
2407 * doesn't hurt either as we only do this on time-jumps or
2408 * in the unlikely event of having been preempted here.
2409 */
2410 for (i = 4; --i; )
2411 {
2412 ev_tstamp diff;
2413 rtmn_diff = ev_rt_now - mn_now;
2414
2415 diff = odiff - rtmn_diff;
2416
2417 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2418 return; /* all is well */
2419
2420 ev_rt_now = ev_time ();
2421 mn_now = get_clock ();
2422 now_floor = mn_now;
2423 }
2424
2425 /* no timer adjustment, as the monotonic clock doesn't jump */
2426 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2427 # if EV_PERIODIC_ENABLE
2428 periodics_reschedule (EV_A);
2429 # endif
2430 }
2431 else
2432 #endif
2433 {
2434 ev_rt_now = ev_time ();
2435
2436 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2437 {
2438 /* adjust timers. this is easy, as the offset is the same for all of them */
2439 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2440 #if EV_PERIODIC_ENABLE
2441 periodics_reschedule (EV_A);
2442 #endif
2443 }
2444
2445 mn_now = ev_rt_now;
2446 }
2447 }
2448
2449 void
2450 ev_run (EV_P_ int flags)
2451 {
2452 #if EV_FEATURE_API
2453 ++loop_depth;
2454 #endif
2455
2456 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2457
2458 loop_done = EVBREAK_CANCEL;
2459
2460 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2461
2462 do
2463 {
2464 #if EV_VERIFY >= 2
2465 ev_verify (EV_A);
2466 #endif
2467
2468 #ifndef _WIN32
2469 if (expect_false (curpid)) /* penalise the forking check even more */
2470 if (expect_false (getpid () != curpid))
2471 {
2472 curpid = getpid ();
2473 postfork = 1;
2474 }
2475 #endif
2476
2477 #if EV_FORK_ENABLE
2478 /* we might have forked, so queue fork handlers */
2479 if (expect_false (postfork))
2480 if (forkcnt)
2481 {
2482 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2483 EV_INVOKE_PENDING;
2484 }
2485 #endif
2486
2487 #if EV_PREPARE_ENABLE
2488 /* queue prepare watchers (and execute them) */
2489 if (expect_false (preparecnt))
2490 {
2491 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2492 EV_INVOKE_PENDING;
2493 }
2494 #endif
2495
2496 if (expect_false (loop_done))
2497 break;
2498
2499 /* we might have forked, so reify kernel state if necessary */
2500 if (expect_false (postfork))
2501 loop_fork (EV_A);
2502
2503 /* update fd-related kernel structures */
2504 fd_reify (EV_A);
2505
2506 /* calculate blocking time */
2507 {
2508 ev_tstamp waittime = 0.;
2509 ev_tstamp sleeptime = 0.;
2510
2511 /* remember old timestamp for io_blocktime calculation */
2512 ev_tstamp prev_mn_now = mn_now;
2513
2514 /* update time to cancel out callback processing overhead */
2515 time_update (EV_A_ 1e100);
2516
2517 /* from now on, we want a pipe-wake-up */
2518 pipe_write_wanted = 1;
2519
2520 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2521 {
2522 waittime = MAX_BLOCKTIME;
2523
2524 if (timercnt)
2525 {
2526 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2527 if (waittime > to) waittime = to;
2528 }
2529
2530 #if EV_PERIODIC_ENABLE
2531 if (periodiccnt)
2532 {
2533 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2534 if (waittime > to) waittime = to;
2535 }
2536 #endif
2537
2538 /* don't let timeouts decrease the waittime below timeout_blocktime */
2539 if (expect_false (waittime < timeout_blocktime))
2540 waittime = timeout_blocktime;
2541
2542 /* at this point, we NEED to wait, so we have to ensure */
2543 /* to pass a minimum nonzero value to the backend */
2544 if (expect_false (waittime < backend_mintime))
2545 waittime = backend_mintime;
2546
2547 /* extra check because io_blocktime is commonly 0 */
2548 if (expect_false (io_blocktime))
2549 {
2550 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2551
2552 if (sleeptime > waittime - backend_mintime)
2553 sleeptime = waittime - backend_mintime;
2554
2555 if (expect_true (sleeptime > 0.))
2556 {
2557 ev_sleep (sleeptime);
2558 waittime -= sleeptime;
2559 }
2560 }
2561 }
2562
2563 #if EV_FEATURE_API
2564 ++loop_count;
2565 #endif
2566 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2567 backend_poll (EV_A_ waittime);
2568 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2569
2570 pipe_write_wanted = 0;
2571
2572 if (pipe_write_skipped)
2573 {
2574 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
2575 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2576 }
2577
2578
2579 /* update ev_rt_now, do magic */
2580 time_update (EV_A_ waittime + sleeptime);
2581 }
2582
2583 /* queue pending timers and reschedule them */
2584 timers_reify (EV_A); /* relative timers called last */
2585 #if EV_PERIODIC_ENABLE
2586 periodics_reify (EV_A); /* absolute timers called first */
2587 #endif
2588
2589 #if EV_IDLE_ENABLE
2590 /* queue idle watchers unless other events are pending */
2591 idle_reify (EV_A);
2592 #endif
2593
2594 #if EV_CHECK_ENABLE
2595 /* queue check watchers, to be executed first */
2596 if (expect_false (checkcnt))
2597 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2598 #endif
2599
2600 EV_INVOKE_PENDING;
2601 }
2602 while (expect_true (
2603 activecnt
2604 && !loop_done
2605 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2606 ));
2607
2608 if (loop_done == EVBREAK_ONE)
2609 loop_done = EVBREAK_CANCEL;
2610
2611 #if EV_FEATURE_API
2612 --loop_depth;
2613 #endif
2614 }
2615
2616 void
2617 ev_break (EV_P_ int how)
2618 {
2619 loop_done = how;
2620 }
2621
2622 void
2623 ev_ref (EV_P)
2624 {
2625 ++activecnt;
2626 }
2627
2628 void
2629 ev_unref (EV_P)
2630 {
2631 --activecnt;
2632 }
2633
2634 void
2635 ev_now_update (EV_P)
2636 {
2637 time_update (EV_A_ 1e100);
2638 }
2639
2640 void
2641 ev_suspend (EV_P)
2642 {
2643 ev_now_update (EV_A);
2644 }
2645
2646 void
2647 ev_resume (EV_P)
2648 {
2649 ev_tstamp mn_prev = mn_now;
2650
2651 ev_now_update (EV_A);
2652 timers_reschedule (EV_A_ mn_now - mn_prev);
2653 #if EV_PERIODIC_ENABLE
2654 /* TODO: really do this? */
2655 periodics_reschedule (EV_A);
2656 #endif
2657 }
2658
2659 /*****************************************************************************/
2660 /* singly-linked list management, used when the expected list length is short */
2661
2662 inline_size void
2663 wlist_add (WL *head, WL elem)
2664 {
2665 elem->next = *head;
2666 *head = elem;
2667 }
2668
2669 inline_size void
2670 wlist_del (WL *head, WL elem)
2671 {
2672 while (*head)
2673 {
2674 if (expect_true (*head == elem))
2675 {
2676 *head = elem->next;
2677 break;
2678 }
2679
2680 head = &(*head)->next;
2681 }
2682 }
2683
2684 /* internal, faster, version of ev_clear_pending */
2685 inline_speed void
2686 clear_pending (EV_P_ W w)
2687 {
2688 if (w->pending)
2689 {
2690 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2691 w->pending = 0;
2692 }
2693 }
2694
2695 int
2696 ev_clear_pending (EV_P_ void *w)
2697 {
2698 W w_ = (W)w;
2699 int pending = w_->pending;
2700
2701 if (expect_true (pending))
2702 {
2703 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2704 p->w = (W)&pending_w;
2705 w_->pending = 0;
2706 return p->events;
2707 }
2708 else
2709 return 0;
2710 }
2711
2712 inline_size void
2713 pri_adjust (EV_P_ W w)
2714 {
2715 int pri = ev_priority (w);
2716 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2717 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2718 ev_set_priority (w, pri);
2719 }
2720
2721 inline_speed void
2722 ev_start (EV_P_ W w, int active)
2723 {
2724 pri_adjust (EV_A_ w);
2725 w->active = active;
2726 ev_ref (EV_A);
2727 }
2728
2729 inline_size void
2730 ev_stop (EV_P_ W w)
2731 {
2732 ev_unref (EV_A);
2733 w->active = 0;
2734 }
2735
2736 /*****************************************************************************/
2737
2738 void noinline
2739 ev_io_start (EV_P_ ev_io *w)
2740 {
2741 int fd = w->fd;
2742
2743 if (expect_false (ev_is_active (w)))
2744 return;
2745
2746 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2747 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2748
2749 EV_FREQUENT_CHECK;
2750
2751 ev_start (EV_A_ (W)w, 1);
2752 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2753 wlist_add (&anfds[fd].head, (WL)w);
2754
2755 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2756 w->events &= ~EV__IOFDSET;
2757
2758 EV_FREQUENT_CHECK;
2759 }
2760
2761 void noinline
2762 ev_io_stop (EV_P_ ev_io *w)
2763 {
2764 clear_pending (EV_A_ (W)w);
2765 if (expect_false (!ev_is_active (w)))
2766 return;
2767
2768 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2769
2770 EV_FREQUENT_CHECK;
2771
2772 wlist_del (&anfds[w->fd].head, (WL)w);
2773 ev_stop (EV_A_ (W)w);
2774
2775 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2776
2777 EV_FREQUENT_CHECK;
2778 }
2779
2780 void noinline
2781 ev_timer_start (EV_P_ ev_timer *w)
2782 {
2783 if (expect_false (ev_is_active (w)))
2784 return;
2785
2786 ev_at (w) += mn_now;
2787
2788 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2789
2790 EV_FREQUENT_CHECK;
2791
2792 ++timercnt;
2793 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2794 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2795 ANHE_w (timers [ev_active (w)]) = (WT)w;
2796 ANHE_at_cache (timers [ev_active (w)]);
2797 upheap (timers, ev_active (w));
2798
2799 EV_FREQUENT_CHECK;
2800
2801 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2802 }
2803
2804 void noinline
2805 ev_timer_stop (EV_P_ ev_timer *w)
2806 {
2807 clear_pending (EV_A_ (W)w);
2808 if (expect_false (!ev_is_active (w)))
2809 return;
2810
2811 EV_FREQUENT_CHECK;
2812
2813 {
2814 int active = ev_active (w);
2815
2816 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2817
2818 --timercnt;
2819
2820 if (expect_true (active < timercnt + HEAP0))
2821 {
2822 timers [active] = timers [timercnt + HEAP0];
2823 adjustheap (timers, timercnt, active);
2824 }
2825 }
2826
2827 ev_at (w) -= mn_now;
2828
2829 ev_stop (EV_A_ (W)w);
2830
2831 EV_FREQUENT_CHECK;
2832 }
2833
2834 void noinline
2835 ev_timer_again (EV_P_ ev_timer *w)
2836 {
2837 EV_FREQUENT_CHECK;
2838
2839 if (ev_is_active (w))
2840 {
2841 if (w->repeat)
2842 {
2843 ev_at (w) = mn_now + w->repeat;
2844 ANHE_at_cache (timers [ev_active (w)]);
2845 adjustheap (timers, timercnt, ev_active (w));
2846 }
2847 else
2848 ev_timer_stop (EV_A_ w);
2849 }
2850 else if (w->repeat)
2851 {
2852 ev_at (w) = w->repeat;
2853 ev_timer_start (EV_A_ w);
2854 }
2855
2856 EV_FREQUENT_CHECK;
2857 }
2858
2859 ev_tstamp
2860 ev_timer_remaining (EV_P_ ev_timer *w)
2861 {
2862 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2863 }
2864
2865 #if EV_PERIODIC_ENABLE
2866 void noinline
2867 ev_periodic_start (EV_P_ ev_periodic *w)
2868 {
2869 if (expect_false (ev_is_active (w)))
2870 return;
2871
2872 if (w->reschedule_cb)
2873 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2874 else if (w->interval)
2875 {
2876 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2877 periodic_recalc (EV_A_ w);
2878 }
2879 else
2880 ev_at (w) = w->offset;
2881
2882 EV_FREQUENT_CHECK;
2883
2884 ++periodiccnt;
2885 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2886 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2887 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2888 ANHE_at_cache (periodics [ev_active (w)]);
2889 upheap (periodics, ev_active (w));
2890
2891 EV_FREQUENT_CHECK;
2892
2893 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2894 }
2895
2896 void noinline
2897 ev_periodic_stop (EV_P_ ev_periodic *w)
2898 {
2899 clear_pending (EV_A_ (W)w);
2900 if (expect_false (!ev_is_active (w)))
2901 return;
2902
2903 EV_FREQUENT_CHECK;
2904
2905 {
2906 int active = ev_active (w);
2907
2908 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2909
2910 --periodiccnt;
2911
2912 if (expect_true (active < periodiccnt + HEAP0))
2913 {
2914 periodics [active] = periodics [periodiccnt + HEAP0];
2915 adjustheap (periodics, periodiccnt, active);
2916 }
2917 }
2918
2919 ev_stop (EV_A_ (W)w);
2920
2921 EV_FREQUENT_CHECK;
2922 }
2923
2924 void noinline
2925 ev_periodic_again (EV_P_ ev_periodic *w)
2926 {
2927 /* TODO: use adjustheap and recalculation */
2928 ev_periodic_stop (EV_A_ w);
2929 ev_periodic_start (EV_A_ w);
2930 }
2931 #endif
2932
2933 #ifndef SA_RESTART
2934 # define SA_RESTART 0
2935 #endif
2936
2937 #if EV_SIGNAL_ENABLE
2938
2939 void noinline
2940 ev_signal_start (EV_P_ ev_signal *w)
2941 {
2942 if (expect_false (ev_is_active (w)))
2943 return;
2944
2945 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2946
2947 #if EV_MULTIPLICITY
2948 assert (("libev: a signal must not be attached to two different loops",
2949 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2950
2951 signals [w->signum - 1].loop = EV_A;
2952 #endif
2953
2954 EV_FREQUENT_CHECK;
2955
2956 #if EV_USE_SIGNALFD
2957 if (sigfd == -2)
2958 {
2959 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2960 if (sigfd < 0 && errno == EINVAL)
2961 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2962
2963 if (sigfd >= 0)
2964 {
2965 fd_intern (sigfd); /* doing it twice will not hurt */
2966
2967 sigemptyset (&sigfd_set);
2968
2969 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2970 ev_set_priority (&sigfd_w, EV_MAXPRI);
2971 ev_io_start (EV_A_ &sigfd_w);
2972 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2973 }
2974 }
2975
2976 if (sigfd >= 0)
2977 {
2978 /* TODO: check .head */
2979 sigaddset (&sigfd_set, w->signum);
2980 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2981
2982 signalfd (sigfd, &sigfd_set, 0);
2983 }
2984 #endif
2985
2986 ev_start (EV_A_ (W)w, 1);
2987 wlist_add (&signals [w->signum - 1].head, (WL)w);
2988
2989 if (!((WL)w)->next)
2990 # if EV_USE_SIGNALFD
2991 if (sigfd < 0) /*TODO*/
2992 # endif
2993 {
2994 # ifdef _WIN32
2995 evpipe_init (EV_A);
2996
2997 signal (w->signum, ev_sighandler);
2998 # else
2999 struct sigaction sa;
3000
3001 evpipe_init (EV_A);
3002
3003 sa.sa_handler = ev_sighandler;
3004 sigfillset (&sa.sa_mask);
3005 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3006 sigaction (w->signum, &sa, 0);
3007
3008 if (origflags & EVFLAG_NOSIGMASK)
3009 {
3010 sigemptyset (&sa.sa_mask);
3011 sigaddset (&sa.sa_mask, w->signum);
3012 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3013 }
3014 #endif
3015 }
3016
3017 EV_FREQUENT_CHECK;
3018 }
3019
3020 void noinline
3021 ev_signal_stop (EV_P_ ev_signal *w)
3022 {
3023 clear_pending (EV_A_ (W)w);
3024 if (expect_false (!ev_is_active (w)))
3025 return;
3026
3027 EV_FREQUENT_CHECK;
3028
3029 wlist_del (&signals [w->signum - 1].head, (WL)w);
3030 ev_stop (EV_A_ (W)w);
3031
3032 if (!signals [w->signum - 1].head)
3033 {
3034 #if EV_MULTIPLICITY
3035 signals [w->signum - 1].loop = 0; /* unattach from signal */
3036 #endif
3037 #if EV_USE_SIGNALFD
3038 if (sigfd >= 0)
3039 {
3040 sigset_t ss;
3041
3042 sigemptyset (&ss);
3043 sigaddset (&ss, w->signum);
3044 sigdelset (&sigfd_set, w->signum);
3045
3046 signalfd (sigfd, &sigfd_set, 0);
3047 sigprocmask (SIG_UNBLOCK, &ss, 0);
3048 }
3049 else
3050 #endif
3051 signal (w->signum, SIG_DFL);
3052 }
3053
3054 EV_FREQUENT_CHECK;
3055 }
3056
3057 #endif
3058
3059 #if EV_CHILD_ENABLE
3060
3061 void
3062 ev_child_start (EV_P_ ev_child *w)
3063 {
3064 #if EV_MULTIPLICITY
3065 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3066 #endif
3067 if (expect_false (ev_is_active (w)))
3068 return;
3069
3070 EV_FREQUENT_CHECK;
3071
3072 ev_start (EV_A_ (W)w, 1);
3073 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3074
3075 EV_FREQUENT_CHECK;
3076 }
3077
3078 void
3079 ev_child_stop (EV_P_ ev_child *w)
3080 {
3081 clear_pending (EV_A_ (W)w);
3082 if (expect_false (!ev_is_active (w)))
3083 return;
3084
3085 EV_FREQUENT_CHECK;
3086
3087 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3088 ev_stop (EV_A_ (W)w);
3089
3090 EV_FREQUENT_CHECK;
3091 }
3092
3093 #endif
3094
3095 #if EV_STAT_ENABLE
3096
3097 # ifdef _WIN32
3098 # undef lstat
3099 # define lstat(a,b) _stati64 (a,b)
3100 # endif
3101
3102 #define DEF_STAT_INTERVAL 5.0074891
3103 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3104 #define MIN_STAT_INTERVAL 0.1074891
3105
3106 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3107
3108 #if EV_USE_INOTIFY
3109
3110 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3111 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3112
3113 static void noinline
3114 infy_add (EV_P_ ev_stat *w)
3115 {
3116 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);
3117
3118 if (w->wd >= 0)
3119 {
3120 struct statfs sfs;
3121
3122 /* now local changes will be tracked by inotify, but remote changes won't */
3123 /* unless the filesystem is known to be local, we therefore still poll */
3124 /* also do poll on <2.6.25, but with normal frequency */
3125
3126 if (!fs_2625)
3127 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3128 else if (!statfs (w->path, &sfs)
3129 && (sfs.f_type == 0x1373 /* devfs */
3130 || sfs.f_type == 0xEF53 /* ext2/3 */
3131 || sfs.f_type == 0x3153464a /* jfs */
3132 || sfs.f_type == 0x52654973 /* reiser3 */
3133 || sfs.f_type == 0x01021994 /* tempfs */
3134 || sfs.f_type == 0x58465342 /* xfs */))
3135 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3136 else
3137 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3138 }
3139 else
3140 {
3141 /* can't use inotify, continue to stat */
3142 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3143
3144 /* if path is not there, monitor some parent directory for speedup hints */
3145 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3146 /* but an efficiency issue only */
3147 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3148 {
3149 char path [4096];
3150 strcpy (path, w->path);
3151
3152 do
3153 {
3154 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3155 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3156
3157 char *pend = strrchr (path, '/');
3158
3159 if (!pend || pend == path)
3160 break;
3161
3162 *pend = 0;
3163 w->wd = inotify_add_watch (fs_fd, path, mask);
3164 }
3165 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3166 }
3167 }
3168
3169 if (w->wd >= 0)
3170 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3171
3172 /* now re-arm timer, if required */
3173 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3174 ev_timer_again (EV_A_ &w->timer);
3175 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3176 }
3177
3178 static void noinline
3179 infy_del (EV_P_ ev_stat *w)
3180 {
3181 int slot;
3182 int wd = w->wd;
3183
3184 if (wd < 0)
3185 return;
3186
3187 w->wd = -2;
3188 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3189 wlist_del (&fs_hash [slot].head, (WL)w);
3190
3191 /* remove this watcher, if others are watching it, they will rearm */
3192 inotify_rm_watch (fs_fd, wd);
3193 }
3194
3195 static void noinline
3196 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3197 {
3198 if (slot < 0)
3199 /* overflow, need to check for all hash slots */
3200 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3201 infy_wd (EV_A_ slot, wd, ev);
3202 else
3203 {
3204 WL w_;
3205
3206 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3207 {
3208 ev_stat *w = (ev_stat *)w_;
3209 w_ = w_->next; /* lets us remove this watcher and all before it */
3210
3211 if (w->wd == wd || wd == -1)
3212 {
3213 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3214 {
3215 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3216 w->wd = -1;
3217 infy_add (EV_A_ w); /* re-add, no matter what */
3218 }
3219
3220 stat_timer_cb (EV_A_ &w->timer, 0);
3221 }
3222 }
3223 }
3224 }
3225
3226 static void
3227 infy_cb (EV_P_ ev_io *w, int revents)
3228 {
3229 char buf [EV_INOTIFY_BUFSIZE];
3230 int ofs;
3231 int len = read (fs_fd, buf, sizeof (buf));
3232
3233 for (ofs = 0; ofs < len; )
3234 {
3235 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3236 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3237 ofs += sizeof (struct inotify_event) + ev->len;
3238 }
3239 }
3240
3241 inline_size void
3242 ev_check_2625 (EV_P)
3243 {
3244 /* kernels < 2.6.25 are borked
3245 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3246 */
3247 if (ev_linux_version () < 0x020619)
3248 return;
3249
3250 fs_2625 = 1;
3251 }
3252
3253 inline_size int
3254 infy_newfd (void)
3255 {
3256 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3257 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3258 if (fd >= 0)
3259 return fd;
3260 #endif
3261 return inotify_init ();
3262 }
3263
3264 inline_size void
3265 infy_init (EV_P)
3266 {
3267 if (fs_fd != -2)
3268 return;
3269
3270 fs_fd = -1;
3271
3272 ev_check_2625 (EV_A);
3273
3274 fs_fd = infy_newfd ();
3275
3276 if (fs_fd >= 0)
3277 {
3278 fd_intern (fs_fd);
3279 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3280 ev_set_priority (&fs_w, EV_MAXPRI);
3281 ev_io_start (EV_A_ &fs_w);
3282 ev_unref (EV_A);
3283 }
3284 }
3285
3286 inline_size void
3287 infy_fork (EV_P)
3288 {
3289 int slot;
3290
3291 if (fs_fd < 0)
3292 return;
3293
3294 ev_ref (EV_A);
3295 ev_io_stop (EV_A_ &fs_w);
3296 close (fs_fd);
3297 fs_fd = infy_newfd ();
3298
3299 if (fs_fd >= 0)
3300 {
3301 fd_intern (fs_fd);
3302 ev_io_set (&fs_w, fs_fd, EV_READ);
3303 ev_io_start (EV_A_ &fs_w);
3304 ev_unref (EV_A);
3305 }
3306
3307 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3308 {
3309 WL w_ = fs_hash [slot].head;
3310 fs_hash [slot].head = 0;
3311
3312 while (w_)
3313 {
3314 ev_stat *w = (ev_stat *)w_;
3315 w_ = w_->next; /* lets us add this watcher */
3316
3317 w->wd = -1;
3318
3319 if (fs_fd >= 0)
3320 infy_add (EV_A_ w); /* re-add, no matter what */
3321 else
3322 {
3323 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3324 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3325 ev_timer_again (EV_A_ &w->timer);
3326 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3327 }
3328 }
3329 }
3330 }
3331
3332 #endif
3333
3334 #ifdef _WIN32
3335 # define EV_LSTAT(p,b) _stati64 (p, b)
3336 #else
3337 # define EV_LSTAT(p,b) lstat (p, b)
3338 #endif
3339
3340 void
3341 ev_stat_stat (EV_P_ ev_stat *w)
3342 {
3343 if (lstat (w->path, &w->attr) < 0)
3344 w->attr.st_nlink = 0;
3345 else if (!w->attr.st_nlink)
3346 w->attr.st_nlink = 1;
3347 }
3348
3349 static void noinline
3350 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3351 {
3352 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3353
3354 ev_statdata prev = w->attr;
3355 ev_stat_stat (EV_A_ w);
3356
3357 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3358 if (
3359 prev.st_dev != w->attr.st_dev
3360 || prev.st_ino != w->attr.st_ino
3361 || prev.st_mode != w->attr.st_mode
3362 || prev.st_nlink != w->attr.st_nlink
3363 || prev.st_uid != w->attr.st_uid
3364 || prev.st_gid != w->attr.st_gid
3365 || prev.st_rdev != w->attr.st_rdev
3366 || prev.st_size != w->attr.st_size
3367 || prev.st_atime != w->attr.st_atime
3368 || prev.st_mtime != w->attr.st_mtime
3369 || prev.st_ctime != w->attr.st_ctime
3370 ) {
3371 /* we only update w->prev on actual differences */
3372 /* in case we test more often than invoke the callback, */
3373 /* to ensure that prev is always different to attr */
3374 w->prev = prev;
3375
3376 #if EV_USE_INOTIFY
3377 if (fs_fd >= 0)
3378 {
3379 infy_del (EV_A_ w);
3380 infy_add (EV_A_ w);
3381 ev_stat_stat (EV_A_ w); /* avoid race... */
3382 }
3383 #endif
3384
3385 ev_feed_event (EV_A_ w, EV_STAT);
3386 }
3387 }
3388
3389 void
3390 ev_stat_start (EV_P_ ev_stat *w)
3391 {
3392 if (expect_false (ev_is_active (w)))
3393 return;
3394
3395 ev_stat_stat (EV_A_ w);
3396
3397 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3398 w->interval = MIN_STAT_INTERVAL;
3399
3400 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3401 ev_set_priority (&w->timer, ev_priority (w));
3402
3403 #if EV_USE_INOTIFY
3404 infy_init (EV_A);
3405
3406 if (fs_fd >= 0)
3407 infy_add (EV_A_ w);
3408 else
3409 #endif
3410 {
3411 ev_timer_again (EV_A_ &w->timer);
3412 ev_unref (EV_A);
3413 }
3414
3415 ev_start (EV_A_ (W)w, 1);
3416
3417 EV_FREQUENT_CHECK;
3418 }
3419
3420 void
3421 ev_stat_stop (EV_P_ ev_stat *w)
3422 {
3423 clear_pending (EV_A_ (W)w);
3424 if (expect_false (!ev_is_active (w)))
3425 return;
3426
3427 EV_FREQUENT_CHECK;
3428
3429 #if EV_USE_INOTIFY
3430 infy_del (EV_A_ w);
3431 #endif
3432
3433 if (ev_is_active (&w->timer))
3434 {
3435 ev_ref (EV_A);
3436 ev_timer_stop (EV_A_ &w->timer);
3437 }
3438
3439 ev_stop (EV_A_ (W)w);
3440
3441 EV_FREQUENT_CHECK;
3442 }
3443 #endif
3444
3445 #if EV_IDLE_ENABLE
3446 void
3447 ev_idle_start (EV_P_ ev_idle *w)
3448 {
3449 if (expect_false (ev_is_active (w)))
3450 return;
3451
3452 pri_adjust (EV_A_ (W)w);
3453
3454 EV_FREQUENT_CHECK;
3455
3456 {
3457 int active = ++idlecnt [ABSPRI (w)];
3458
3459 ++idleall;
3460 ev_start (EV_A_ (W)w, active);
3461
3462 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3463 idles [ABSPRI (w)][active - 1] = w;
3464 }
3465
3466 EV_FREQUENT_CHECK;
3467 }
3468
3469 void
3470 ev_idle_stop (EV_P_ ev_idle *w)
3471 {
3472 clear_pending (EV_A_ (W)w);
3473 if (expect_false (!ev_is_active (w)))
3474 return;
3475
3476 EV_FREQUENT_CHECK;
3477
3478 {
3479 int active = ev_active (w);
3480
3481 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3482 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3483
3484 ev_stop (EV_A_ (W)w);
3485 --idleall;
3486 }
3487
3488 EV_FREQUENT_CHECK;
3489 }
3490 #endif
3491
3492 #if EV_PREPARE_ENABLE
3493 void
3494 ev_prepare_start (EV_P_ ev_prepare *w)
3495 {
3496 if (expect_false (ev_is_active (w)))
3497 return;
3498
3499 EV_FREQUENT_CHECK;
3500
3501 ev_start (EV_A_ (W)w, ++preparecnt);
3502 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3503 prepares [preparecnt - 1] = w;
3504
3505 EV_FREQUENT_CHECK;
3506 }
3507
3508 void
3509 ev_prepare_stop (EV_P_ ev_prepare *w)
3510 {
3511 clear_pending (EV_A_ (W)w);
3512 if (expect_false (!ev_is_active (w)))
3513 return;
3514
3515 EV_FREQUENT_CHECK;
3516
3517 {
3518 int active = ev_active (w);
3519
3520 prepares [active - 1] = prepares [--preparecnt];
3521 ev_active (prepares [active - 1]) = active;
3522 }
3523
3524 ev_stop (EV_A_ (W)w);
3525
3526 EV_FREQUENT_CHECK;
3527 }
3528 #endif
3529
3530 #if EV_CHECK_ENABLE
3531 void
3532 ev_check_start (EV_P_ ev_check *w)
3533 {
3534 if (expect_false (ev_is_active (w)))
3535 return;
3536
3537 EV_FREQUENT_CHECK;
3538
3539 ev_start (EV_A_ (W)w, ++checkcnt);
3540 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3541 checks [checkcnt - 1] = w;
3542
3543 EV_FREQUENT_CHECK;
3544 }
3545
3546 void
3547 ev_check_stop (EV_P_ ev_check *w)
3548 {
3549 clear_pending (EV_A_ (W)w);
3550 if (expect_false (!ev_is_active (w)))
3551 return;
3552
3553 EV_FREQUENT_CHECK;
3554
3555 {
3556 int active = ev_active (w);
3557
3558 checks [active - 1] = checks [--checkcnt];
3559 ev_active (checks [active - 1]) = active;
3560 }
3561
3562 ev_stop (EV_A_ (W)w);
3563
3564 EV_FREQUENT_CHECK;
3565 }
3566 #endif
3567
3568 #if EV_EMBED_ENABLE
3569 void noinline
3570 ev_embed_sweep (EV_P_ ev_embed *w)
3571 {
3572 ev_run (w->other, EVRUN_NOWAIT);
3573 }
3574
3575 static void
3576 embed_io_cb (EV_P_ ev_io *io, int revents)
3577 {
3578 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3579
3580 if (ev_cb (w))
3581 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3582 else
3583 ev_run (w->other, EVRUN_NOWAIT);
3584 }
3585
3586 static void
3587 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3588 {
3589 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3590
3591 {
3592 EV_P = w->other;
3593
3594 while (fdchangecnt)
3595 {
3596 fd_reify (EV_A);
3597 ev_run (EV_A_ EVRUN_NOWAIT);
3598 }
3599 }
3600 }
3601
3602 static void
3603 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3604 {
3605 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3606
3607 ev_embed_stop (EV_A_ w);
3608
3609 {
3610 EV_P = w->other;
3611
3612 ev_loop_fork (EV_A);
3613 ev_run (EV_A_ EVRUN_NOWAIT);
3614 }
3615
3616 ev_embed_start (EV_A_ w);
3617 }
3618
3619 #if 0
3620 static void
3621 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3622 {
3623 ev_idle_stop (EV_A_ idle);
3624 }
3625 #endif
3626
3627 void
3628 ev_embed_start (EV_P_ ev_embed *w)
3629 {
3630 if (expect_false (ev_is_active (w)))
3631 return;
3632
3633 {
3634 EV_P = w->other;
3635 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3636 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3637 }
3638
3639 EV_FREQUENT_CHECK;
3640
3641 ev_set_priority (&w->io, ev_priority (w));
3642 ev_io_start (EV_A_ &w->io);
3643
3644 ev_prepare_init (&w->prepare, embed_prepare_cb);
3645 ev_set_priority (&w->prepare, EV_MINPRI);
3646 ev_prepare_start (EV_A_ &w->prepare);
3647
3648 ev_fork_init (&w->fork, embed_fork_cb);
3649 ev_fork_start (EV_A_ &w->fork);
3650
3651 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3652
3653 ev_start (EV_A_ (W)w, 1);
3654
3655 EV_FREQUENT_CHECK;
3656 }
3657
3658 void
3659 ev_embed_stop (EV_P_ ev_embed *w)
3660 {
3661 clear_pending (EV_A_ (W)w);
3662 if (expect_false (!ev_is_active (w)))
3663 return;
3664
3665 EV_FREQUENT_CHECK;
3666
3667 ev_io_stop (EV_A_ &w->io);
3668 ev_prepare_stop (EV_A_ &w->prepare);
3669 ev_fork_stop (EV_A_ &w->fork);
3670
3671 ev_stop (EV_A_ (W)w);
3672
3673 EV_FREQUENT_CHECK;
3674 }
3675 #endif
3676
3677 #if EV_FORK_ENABLE
3678 void
3679 ev_fork_start (EV_P_ ev_fork *w)
3680 {
3681 if (expect_false (ev_is_active (w)))
3682 return;
3683
3684 EV_FREQUENT_CHECK;
3685
3686 ev_start (EV_A_ (W)w, ++forkcnt);
3687 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3688 forks [forkcnt - 1] = w;
3689
3690 EV_FREQUENT_CHECK;
3691 }
3692
3693 void
3694 ev_fork_stop (EV_P_ ev_fork *w)
3695 {
3696 clear_pending (EV_A_ (W)w);
3697 if (expect_false (!ev_is_active (w)))
3698 return;
3699
3700 EV_FREQUENT_CHECK;
3701
3702 {
3703 int active = ev_active (w);
3704
3705 forks [active - 1] = forks [--forkcnt];
3706 ev_active (forks [active - 1]) = active;
3707 }
3708
3709 ev_stop (EV_A_ (W)w);
3710
3711 EV_FREQUENT_CHECK;
3712 }
3713 #endif
3714
3715 #if EV_CLEANUP_ENABLE
3716 void
3717 ev_cleanup_start (EV_P_ ev_cleanup *w)
3718 {
3719 if (expect_false (ev_is_active (w)))
3720 return;
3721
3722 EV_FREQUENT_CHECK;
3723
3724 ev_start (EV_A_ (W)w, ++cleanupcnt);
3725 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3726 cleanups [cleanupcnt - 1] = w;
3727
3728 /* cleanup watchers should never keep a refcount on the loop */
3729 ev_unref (EV_A);
3730 EV_FREQUENT_CHECK;
3731 }
3732
3733 void
3734 ev_cleanup_stop (EV_P_ ev_cleanup *w)
3735 {
3736 clear_pending (EV_A_ (W)w);
3737 if (expect_false (!ev_is_active (w)))
3738 return;
3739
3740 EV_FREQUENT_CHECK;
3741 ev_ref (EV_A);
3742
3743 {
3744 int active = ev_active (w);
3745
3746 cleanups [active - 1] = cleanups [--cleanupcnt];
3747 ev_active (cleanups [active - 1]) = active;
3748 }
3749
3750 ev_stop (EV_A_ (W)w);
3751
3752 EV_FREQUENT_CHECK;
3753 }
3754 #endif
3755
3756 #if EV_ASYNC_ENABLE
3757 void
3758 ev_async_start (EV_P_ ev_async *w)
3759 {
3760 if (expect_false (ev_is_active (w)))
3761 return;
3762
3763 w->sent = 0;
3764
3765 evpipe_init (EV_A);
3766
3767 EV_FREQUENT_CHECK;
3768
3769 ev_start (EV_A_ (W)w, ++asynccnt);
3770 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3771 asyncs [asynccnt - 1] = w;
3772
3773 EV_FREQUENT_CHECK;
3774 }
3775
3776 void
3777 ev_async_stop (EV_P_ ev_async *w)
3778 {
3779 clear_pending (EV_A_ (W)w);
3780 if (expect_false (!ev_is_active (w)))
3781 return;
3782
3783 EV_FREQUENT_CHECK;
3784
3785 {
3786 int active = ev_active (w);
3787
3788 asyncs [active - 1] = asyncs [--asynccnt];
3789 ev_active (asyncs [active - 1]) = active;
3790 }
3791
3792 ev_stop (EV_A_ (W)w);
3793
3794 EV_FREQUENT_CHECK;
3795 }
3796
3797 void
3798 ev_async_send (EV_P_ ev_async *w)
3799 {
3800 w->sent = 1;
3801 evpipe_write (EV_A_ &async_pending);
3802 }
3803 #endif
3804
3805 /*****************************************************************************/
3806
3807 struct ev_once
3808 {
3809 ev_io io;
3810 ev_timer to;
3811 void (*cb)(int revents, void *arg);
3812 void *arg;
3813 };
3814
3815 static void
3816 once_cb (EV_P_ struct ev_once *once, int revents)
3817 {
3818 void (*cb)(int revents, void *arg) = once->cb;
3819 void *arg = once->arg;
3820
3821 ev_io_stop (EV_A_ &once->io);
3822 ev_timer_stop (EV_A_ &once->to);
3823 ev_free (once);
3824
3825 cb (revents, arg);
3826 }
3827
3828 static void
3829 once_cb_io (EV_P_ ev_io *w, int revents)
3830 {
3831 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3832
3833 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3834 }
3835
3836 static void
3837 once_cb_to (EV_P_ ev_timer *w, int revents)
3838 {
3839 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3840
3841 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3842 }
3843
3844 void
3845 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3846 {
3847 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3848
3849 if (expect_false (!once))
3850 {
3851 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3852 return;
3853 }
3854
3855 once->cb = cb;
3856 once->arg = arg;
3857
3858 ev_init (&once->io, once_cb_io);
3859 if (fd >= 0)
3860 {
3861 ev_io_set (&once->io, fd, events);
3862 ev_io_start (EV_A_ &once->io);
3863 }
3864
3865 ev_init (&once->to, once_cb_to);
3866 if (timeout >= 0.)
3867 {
3868 ev_timer_set (&once->to, timeout, 0.);
3869 ev_timer_start (EV_A_ &once->to);
3870 }
3871 }
3872
3873 /*****************************************************************************/
3874
3875 #if EV_WALK_ENABLE
3876 void
3877 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3878 {
3879 int i, j;
3880 ev_watcher_list *wl, *wn;
3881
3882 if (types & (EV_IO | EV_EMBED))
3883 for (i = 0; i < anfdmax; ++i)
3884 for (wl = anfds [i].head; wl; )
3885 {
3886 wn = wl->next;
3887
3888 #if EV_EMBED_ENABLE
3889 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3890 {
3891 if (types & EV_EMBED)
3892 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3893 }
3894 else
3895 #endif
3896 #if EV_USE_INOTIFY
3897 if (ev_cb ((ev_io *)wl) == infy_cb)
3898 ;
3899 else
3900 #endif
3901 if ((ev_io *)wl != &pipe_w)
3902 if (types & EV_IO)
3903 cb (EV_A_ EV_IO, wl);
3904
3905 wl = wn;
3906 }
3907
3908 if (types & (EV_TIMER | EV_STAT))
3909 for (i = timercnt + HEAP0; i-- > HEAP0; )
3910 #if EV_STAT_ENABLE
3911 /*TODO: timer is not always active*/
3912 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3913 {
3914 if (types & EV_STAT)
3915 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3916 }
3917 else
3918 #endif
3919 if (types & EV_TIMER)
3920 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3921
3922 #if EV_PERIODIC_ENABLE
3923 if (types & EV_PERIODIC)
3924 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3925 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3926 #endif
3927
3928 #if EV_IDLE_ENABLE
3929 if (types & EV_IDLE)
3930 for (j = NUMPRI; i--; )
3931 for (i = idlecnt [j]; i--; )
3932 cb (EV_A_ EV_IDLE, idles [j][i]);
3933 #endif
3934
3935 #if EV_FORK_ENABLE
3936 if (types & EV_FORK)
3937 for (i = forkcnt; i--; )
3938 if (ev_cb (forks [i]) != embed_fork_cb)
3939 cb (EV_A_ EV_FORK, forks [i]);
3940 #endif
3941
3942 #if EV_ASYNC_ENABLE
3943 if (types & EV_ASYNC)
3944 for (i = asynccnt; i--; )
3945 cb (EV_A_ EV_ASYNC, asyncs [i]);
3946 #endif
3947
3948 #if EV_PREPARE_ENABLE
3949 if (types & EV_PREPARE)
3950 for (i = preparecnt; i--; )
3951 # if EV_EMBED_ENABLE
3952 if (ev_cb (prepares [i]) != embed_prepare_cb)
3953 # endif
3954 cb (EV_A_ EV_PREPARE, prepares [i]);
3955 #endif
3956
3957 #if EV_CHECK_ENABLE
3958 if (types & EV_CHECK)
3959 for (i = checkcnt; i--; )
3960 cb (EV_A_ EV_CHECK, checks [i]);
3961 #endif
3962
3963 #if EV_SIGNAL_ENABLE
3964 if (types & EV_SIGNAL)
3965 for (i = 0; i < EV_NSIG - 1; ++i)
3966 for (wl = signals [i].head; wl; )
3967 {
3968 wn = wl->next;
3969 cb (EV_A_ EV_SIGNAL, wl);
3970 wl = wn;
3971 }
3972 #endif
3973
3974 #if EV_CHILD_ENABLE
3975 if (types & EV_CHILD)
3976 for (i = (EV_PID_HASHSIZE); i--; )
3977 for (wl = childs [i]; wl; )
3978 {
3979 wn = wl->next;
3980 cb (EV_A_ EV_CHILD, wl);
3981 wl = wn;
3982 }
3983 #endif
3984 /* EV_STAT 0x00001000 /* stat data changed */
3985 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
3986 }
3987 #endif
3988
3989 #if EV_MULTIPLICITY
3990 #include "ev_wrap.h"
3991 #endif
3992
3993 EV_CPP(})
3994