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/cvs/libev/ev.c
Revision: 1.362
Committed: Sun Oct 24 19:15:52 2010 UTC (13 years, 9 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.361: +3 -0 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 /* this big block deduces configuration from config.h */
41 #ifndef EV_STANDALONE
42 # ifdef EV_CONFIG_H
43 # include EV_CONFIG_H
44 # else
45 # include "config.h"
46 # endif
47
48 # if HAVE_CLOCK_SYSCALL
49 # ifndef EV_USE_CLOCK_SYSCALL
50 # define EV_USE_CLOCK_SYSCALL 1
51 # ifndef EV_USE_REALTIME
52 # define EV_USE_REALTIME 0
53 # endif
54 # ifndef EV_USE_MONOTONIC
55 # define EV_USE_MONOTONIC 1
56 # endif
57 # endif
58 # elif !defined(EV_USE_CLOCK_SYSCALL)
59 # define EV_USE_CLOCK_SYSCALL 0
60 # endif
61
62 # if HAVE_CLOCK_GETTIME
63 # ifndef EV_USE_MONOTONIC
64 # define EV_USE_MONOTONIC 1
65 # endif
66 # ifndef EV_USE_REALTIME
67 # define EV_USE_REALTIME 0
68 # endif
69 # else
70 # ifndef EV_USE_MONOTONIC
71 # define EV_USE_MONOTONIC 0
72 # endif
73 # ifndef EV_USE_REALTIME
74 # define EV_USE_REALTIME 0
75 # endif
76 # endif
77
78 # if HAVE_NANOSLEEP
79 # ifndef EV_USE_NANOSLEEP
80 # define EV_USE_NANOSLEEP EV_FEATURE_OS
81 # endif
82 # else
83 # undef EV_USE_NANOSLEEP
84 # define EV_USE_NANOSLEEP 0
85 # endif
86
87 # if HAVE_SELECT && HAVE_SYS_SELECT_H
88 # ifndef EV_USE_SELECT
89 # define EV_USE_SELECT EV_FEATURE_BACKENDS
90 # endif
91 # else
92 # undef EV_USE_SELECT
93 # define EV_USE_SELECT 0
94 # endif
95
96 # if HAVE_POLL && HAVE_POLL_H
97 # ifndef EV_USE_POLL
98 # define EV_USE_POLL EV_FEATURE_BACKENDS
99 # endif
100 # else
101 # undef EV_USE_POLL
102 # define EV_USE_POLL 0
103 # endif
104
105 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
106 # ifndef EV_USE_EPOLL
107 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
108 # endif
109 # else
110 # undef EV_USE_EPOLL
111 # define EV_USE_EPOLL 0
112 # endif
113
114 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
115 # ifndef EV_USE_KQUEUE
116 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
117 # endif
118 # else
119 # undef EV_USE_KQUEUE
120 # define EV_USE_KQUEUE 0
121 # endif
122
123 # if HAVE_PORT_H && HAVE_PORT_CREATE
124 # ifndef EV_USE_PORT
125 # define EV_USE_PORT EV_FEATURE_BACKENDS
126 # endif
127 # else
128 # undef EV_USE_PORT
129 # define EV_USE_PORT 0
130 # endif
131
132 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
133 # ifndef EV_USE_INOTIFY
134 # define EV_USE_INOTIFY EV_FEATURE_OS
135 # endif
136 # else
137 # undef EV_USE_INOTIFY
138 # define EV_USE_INOTIFY 0
139 # endif
140
141 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
142 # ifndef EV_USE_SIGNALFD
143 # define EV_USE_SIGNALFD EV_FEATURE_OS
144 # endif
145 # else
146 # undef EV_USE_SIGNALFD
147 # define EV_USE_SIGNALFD 0
148 # endif
149
150 # if HAVE_EVENTFD
151 # ifndef EV_USE_EVENTFD
152 # define EV_USE_EVENTFD EV_FEATURE_OS
153 # endif
154 # else
155 # undef EV_USE_EVENTFD
156 # define EV_USE_EVENTFD 0
157 # endif
158
159 #endif
160
161 #include <math.h>
162 #include <stdlib.h>
163 #include <string.h>
164 #include <fcntl.h>
165 #include <stddef.h>
166
167 #include <stdio.h>
168
169 #include <assert.h>
170 #include <errno.h>
171 #include <sys/types.h>
172 #include <time.h>
173 #include <limits.h>
174
175 #include <signal.h>
176
177 #ifdef EV_H
178 # include EV_H
179 #else
180 # include "ev.h"
181 #endif
182
183 EV_CPP(extern "C" {)
184
185 #ifndef _WIN32
186 # include <sys/time.h>
187 # include <sys/wait.h>
188 # include <unistd.h>
189 #else
190 # include <io.h>
191 # define WIN32_LEAN_AND_MEAN
192 # include <windows.h>
193 # ifndef EV_SELECT_IS_WINSOCKET
194 # define EV_SELECT_IS_WINSOCKET 1
195 # endif
196 # undef EV_AVOID_STDIO
197 #endif
198
199 /* OS X, in its infinite idiocy, actually HARDCODES
200 * a limit of 1024 into their select. Where people have brains,
201 * OS X engineers apparently have a vacuum. Or maybe they were
202 * ordered to have a vacuum, or they do anything for money.
203 * This might help. Or not.
204 */
205 #define _DARWIN_UNLIMITED_SELECT 1
206
207 /* this block tries to deduce configuration from header-defined symbols and defaults */
208
209 /* try to deduce the maximum number of signals on this platform */
210 #if defined (EV_NSIG)
211 /* use what's provided */
212 #elif defined (NSIG)
213 # define EV_NSIG (NSIG)
214 #elif defined(_NSIG)
215 # define EV_NSIG (_NSIG)
216 #elif defined (SIGMAX)
217 # define EV_NSIG (SIGMAX+1)
218 #elif defined (SIG_MAX)
219 # define EV_NSIG (SIG_MAX+1)
220 #elif defined (_SIG_MAX)
221 # define EV_NSIG (_SIG_MAX+1)
222 #elif defined (MAXSIG)
223 # define EV_NSIG (MAXSIG+1)
224 #elif defined (MAX_SIG)
225 # define EV_NSIG (MAX_SIG+1)
226 #elif defined (SIGARRAYSIZE)
227 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
228 #elif defined (_sys_nsig)
229 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
230 #else
231 # error "unable to find value for NSIG, please report"
232 /* to make it compile regardless, just remove the above line, */
233 /* but consider reporting it, too! :) */
234 # define EV_NSIG 65
235 #endif
236
237 #ifndef EV_USE_CLOCK_SYSCALL
238 # if __linux && __GLIBC__ >= 2
239 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
240 # else
241 # define EV_USE_CLOCK_SYSCALL 0
242 # endif
243 #endif
244
245 #ifndef EV_USE_MONOTONIC
246 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
247 # define EV_USE_MONOTONIC EV_FEATURE_OS
248 # else
249 # define EV_USE_MONOTONIC 0
250 # endif
251 #endif
252
253 #ifndef EV_USE_REALTIME
254 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
255 #endif
256
257 #ifndef EV_USE_NANOSLEEP
258 # if _POSIX_C_SOURCE >= 199309L
259 # define EV_USE_NANOSLEEP EV_FEATURE_OS
260 # else
261 # define EV_USE_NANOSLEEP 0
262 # endif
263 #endif
264
265 #ifndef EV_USE_SELECT
266 # define EV_USE_SELECT EV_FEATURE_BACKENDS
267 #endif
268
269 #ifndef EV_USE_POLL
270 # ifdef _WIN32
271 # define EV_USE_POLL 0
272 # else
273 # define EV_USE_POLL EV_FEATURE_BACKENDS
274 # endif
275 #endif
276
277 #ifndef EV_USE_EPOLL
278 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
279 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
280 # else
281 # define EV_USE_EPOLL 0
282 # endif
283 #endif
284
285 #ifndef EV_USE_KQUEUE
286 # define EV_USE_KQUEUE 0
287 #endif
288
289 #ifndef EV_USE_PORT
290 # define EV_USE_PORT 0
291 #endif
292
293 #ifndef EV_USE_INOTIFY
294 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
295 # define EV_USE_INOTIFY EV_FEATURE_OS
296 # else
297 # define EV_USE_INOTIFY 0
298 # endif
299 #endif
300
301 #ifndef EV_PID_HASHSIZE
302 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
303 #endif
304
305 #ifndef EV_INOTIFY_HASHSIZE
306 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
307 #endif
308
309 #ifndef EV_USE_EVENTFD
310 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
311 # define EV_USE_EVENTFD EV_FEATURE_OS
312 # else
313 # define EV_USE_EVENTFD 0
314 # endif
315 #endif
316
317 #ifndef EV_USE_SIGNALFD
318 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
319 # define EV_USE_SIGNALFD EV_FEATURE_OS
320 # else
321 # define EV_USE_SIGNALFD 0
322 # endif
323 #endif
324
325 #if 0 /* debugging */
326 # define EV_VERIFY 3
327 # define EV_USE_4HEAP 1
328 # define EV_HEAP_CACHE_AT 1
329 #endif
330
331 #ifndef EV_VERIFY
332 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
333 #endif
334
335 #ifndef EV_USE_4HEAP
336 # define EV_USE_4HEAP EV_FEATURE_DATA
337 #endif
338
339 #ifndef EV_HEAP_CACHE_AT
340 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
341 #endif
342
343 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
344 /* which makes programs even slower. might work on other unices, too. */
345 #if EV_USE_CLOCK_SYSCALL
346 # include <syscall.h>
347 # ifdef SYS_clock_gettime
348 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
349 # undef EV_USE_MONOTONIC
350 # define EV_USE_MONOTONIC 1
351 # else
352 # undef EV_USE_CLOCK_SYSCALL
353 # define EV_USE_CLOCK_SYSCALL 0
354 # endif
355 #endif
356
357 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
358
359 #ifdef _AIX
360 /* AIX has a completely broken poll.h header */
361 # undef EV_USE_POLL
362 # define EV_USE_POLL 0
363 #endif
364
365 #ifndef CLOCK_MONOTONIC
366 # undef EV_USE_MONOTONIC
367 # define EV_USE_MONOTONIC 0
368 #endif
369
370 #ifndef CLOCK_REALTIME
371 # undef EV_USE_REALTIME
372 # define EV_USE_REALTIME 0
373 #endif
374
375 #if !EV_STAT_ENABLE
376 # undef EV_USE_INOTIFY
377 # define EV_USE_INOTIFY 0
378 #endif
379
380 #if !EV_USE_NANOSLEEP
381 # ifndef _WIN32
382 # include <sys/select.h>
383 # endif
384 #endif
385
386 #if EV_USE_INOTIFY
387 # include <sys/statfs.h>
388 # include <sys/inotify.h>
389 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
390 # ifndef IN_DONT_FOLLOW
391 # undef EV_USE_INOTIFY
392 # define EV_USE_INOTIFY 0
393 # endif
394 #endif
395
396 #if EV_SELECT_IS_WINSOCKET
397 # include <winsock.h>
398 #endif
399
400 #if EV_USE_EVENTFD
401 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
402 # include <stdint.h>
403 # ifndef EFD_NONBLOCK
404 # define EFD_NONBLOCK O_NONBLOCK
405 # endif
406 # ifndef EFD_CLOEXEC
407 # ifdef O_CLOEXEC
408 # define EFD_CLOEXEC O_CLOEXEC
409 # else
410 # define EFD_CLOEXEC 02000000
411 # endif
412 # endif
413 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
414 #endif
415
416 #if EV_USE_SIGNALFD
417 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
418 # include <stdint.h>
419 # ifndef SFD_NONBLOCK
420 # define SFD_NONBLOCK O_NONBLOCK
421 # endif
422 # ifndef SFD_CLOEXEC
423 # ifdef O_CLOEXEC
424 # define SFD_CLOEXEC O_CLOEXEC
425 # else
426 # define SFD_CLOEXEC 02000000
427 # endif
428 # endif
429 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
430
431 struct signalfd_siginfo
432 {
433 uint32_t ssi_signo;
434 char pad[128 - sizeof (uint32_t)];
435 };
436 #endif
437
438 /**/
439
440 #if EV_VERIFY >= 3
441 # define EV_FREQUENT_CHECK ev_verify (EV_A)
442 #else
443 # define EV_FREQUENT_CHECK do { } while (0)
444 #endif
445
446 /*
447 * This is used to avoid floating point rounding problems.
448 * It is added to ev_rt_now when scheduling periodics
449 * to ensure progress, time-wise, even when rounding
450 * errors are against us.
451 * This value is good at least till the year 4000.
452 * Better solutions welcome.
453 */
454 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
455
456 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
457 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
458
459 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
460 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
461
462 #if __GNUC__ >= 4
463 # define expect(expr,value) __builtin_expect ((expr),(value))
464 # define noinline __attribute__ ((noinline))
465 #else
466 # define expect(expr,value) (expr)
467 # define noinline
468 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
469 # define inline
470 # endif
471 #endif
472
473 #define expect_false(expr) expect ((expr) != 0, 0)
474 #define expect_true(expr) expect ((expr) != 0, 1)
475 #define inline_size static inline
476
477 #if EV_FEATURE_CODE
478 # define inline_speed static inline
479 #else
480 # define inline_speed static noinline
481 #endif
482
483 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
484
485 #if EV_MINPRI == EV_MAXPRI
486 # define ABSPRI(w) (((W)w), 0)
487 #else
488 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
489 #endif
490
491 #define EMPTY /* required for microsofts broken pseudo-c compiler */
492 #define EMPTY2(a,b) /* used to suppress some warnings */
493
494 typedef ev_watcher *W;
495 typedef ev_watcher_list *WL;
496 typedef ev_watcher_time *WT;
497
498 #define ev_active(w) ((W)(w))->active
499 #define ev_at(w) ((WT)(w))->at
500
501 #if EV_USE_REALTIME
502 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
503 /* giving it a reasonably high chance of working on typical architectures */
504 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
505 #endif
506
507 #if EV_USE_MONOTONIC
508 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
509 #endif
510
511 #ifndef EV_FD_TO_WIN32_HANDLE
512 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
513 #endif
514 #ifndef EV_WIN32_HANDLE_TO_FD
515 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
516 #endif
517 #ifndef EV_WIN32_CLOSE_FD
518 # define EV_WIN32_CLOSE_FD(fd) close (fd)
519 #endif
520
521 #ifdef _WIN32
522 # include "ev_win32.c"
523 #endif
524
525 /*****************************************************************************/
526
527 #ifdef __linux
528 # include <sys/utsname.h>
529 #endif
530
531 static unsigned int noinline
532 ev_linux_version (void)
533 {
534 #ifdef __linux
535 unsigned int v = 0;
536 struct utsname buf;
537 int i;
538 char *p = buf.release;
539
540 if (uname (&buf))
541 return 0;
542
543 for (i = 3+1; --i; )
544 {
545 unsigned int c = 0;
546
547 for (;;)
548 {
549 if (*p >= '0' && *p <= '9')
550 c = c * 10 + *p++ - '0';
551 else
552 {
553 p += *p == '.';
554 break;
555 }
556 }
557
558 v = (v << 8) | c;
559 }
560
561 return v;
562 #else
563 return 0;
564 #endif
565 }
566
567 /*****************************************************************************/
568
569 #if EV_AVOID_STDIO
570 static void noinline
571 ev_printerr (const char *msg)
572 {
573 write (STDERR_FILENO, msg, strlen (msg));
574 }
575 #endif
576
577 static void (*syserr_cb)(const char *msg);
578
579 void
580 ev_set_syserr_cb (void (*cb)(const char *msg))
581 {
582 syserr_cb = cb;
583 }
584
585 static void noinline
586 ev_syserr (const char *msg)
587 {
588 if (!msg)
589 msg = "(libev) system error";
590
591 if (syserr_cb)
592 syserr_cb (msg);
593 else
594 {
595 #if EV_AVOID_STDIO
596 const char *err = strerror (errno);
597
598 ev_printerr (msg);
599 ev_printerr (": ");
600 ev_printerr (err);
601 ev_printerr ("\n");
602 #else
603 perror (msg);
604 #endif
605 abort ();
606 }
607 }
608
609 static void *
610 ev_realloc_emul (void *ptr, long size)
611 {
612 #if __GLIBC__
613 return realloc (ptr, size);
614 #else
615 /* some systems, notably openbsd and darwin, fail to properly
616 * implement realloc (x, 0) (as required by both ansi c-89 and
617 * the single unix specification, so work around them here.
618 */
619
620 if (size)
621 return realloc (ptr, size);
622
623 free (ptr);
624 return 0;
625 #endif
626 }
627
628 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
629
630 void
631 ev_set_allocator (void *(*cb)(void *ptr, long size))
632 {
633 alloc = cb;
634 }
635
636 inline_speed void *
637 ev_realloc (void *ptr, long size)
638 {
639 ptr = alloc (ptr, size);
640
641 if (!ptr && size)
642 {
643 #if EV_AVOID_STDIO
644 ev_printerr ("libev: memory allocation failed, aborting.\n");
645 #else
646 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
647 #endif
648 abort ();
649 }
650
651 return ptr;
652 }
653
654 #define ev_malloc(size) ev_realloc (0, (size))
655 #define ev_free(ptr) ev_realloc ((ptr), 0)
656
657 /*****************************************************************************/
658
659 /* set in reify when reification needed */
660 #define EV_ANFD_REIFY 1
661
662 /* file descriptor info structure */
663 typedef struct
664 {
665 WL head;
666 unsigned char events; /* the events watched for */
667 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
668 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
669 unsigned char unused;
670 #if EV_USE_EPOLL
671 unsigned int egen; /* generation counter to counter epoll bugs */
672 #endif
673 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
674 SOCKET handle;
675 #endif
676 #if EV_USE_IOCP
677 OVERLAPPED or, ow;
678 #endif
679 } ANFD;
680
681 /* stores the pending event set for a given watcher */
682 typedef struct
683 {
684 W w;
685 int events; /* the pending event set for the given watcher */
686 } ANPENDING;
687
688 #if EV_USE_INOTIFY
689 /* hash table entry per inotify-id */
690 typedef struct
691 {
692 WL head;
693 } ANFS;
694 #endif
695
696 /* Heap Entry */
697 #if EV_HEAP_CACHE_AT
698 /* a heap element */
699 typedef struct {
700 ev_tstamp at;
701 WT w;
702 } ANHE;
703
704 #define ANHE_w(he) (he).w /* access watcher, read-write */
705 #define ANHE_at(he) (he).at /* access cached at, read-only */
706 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
707 #else
708 /* a heap element */
709 typedef WT ANHE;
710
711 #define ANHE_w(he) (he)
712 #define ANHE_at(he) (he)->at
713 #define ANHE_at_cache(he)
714 #endif
715
716 #if EV_MULTIPLICITY
717
718 struct ev_loop
719 {
720 ev_tstamp ev_rt_now;
721 #define ev_rt_now ((loop)->ev_rt_now)
722 #define VAR(name,decl) decl;
723 #include "ev_vars.h"
724 #undef VAR
725 };
726 #include "ev_wrap.h"
727
728 static struct ev_loop default_loop_struct;
729 struct ev_loop *ev_default_loop_ptr;
730
731 #else
732
733 ev_tstamp ev_rt_now;
734 #define VAR(name,decl) static decl;
735 #include "ev_vars.h"
736 #undef VAR
737
738 static int ev_default_loop_ptr;
739
740 #endif
741
742 #if EV_FEATURE_API
743 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
744 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
745 # define EV_INVOKE_PENDING invoke_cb (EV_A)
746 #else
747 # define EV_RELEASE_CB (void)0
748 # define EV_ACQUIRE_CB (void)0
749 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
750 #endif
751
752 #define EVBREAK_RECURSE 0x80
753
754 /*****************************************************************************/
755
756 #ifndef EV_HAVE_EV_TIME
757 ev_tstamp
758 ev_time (void)
759 {
760 #if EV_USE_REALTIME
761 if (expect_true (have_realtime))
762 {
763 struct timespec ts;
764 clock_gettime (CLOCK_REALTIME, &ts);
765 return ts.tv_sec + ts.tv_nsec * 1e-9;
766 }
767 #endif
768
769 struct timeval tv;
770 gettimeofday (&tv, 0);
771 return tv.tv_sec + tv.tv_usec * 1e-6;
772 }
773 #endif
774
775 inline_size ev_tstamp
776 get_clock (void)
777 {
778 #if EV_USE_MONOTONIC
779 if (expect_true (have_monotonic))
780 {
781 struct timespec ts;
782 clock_gettime (CLOCK_MONOTONIC, &ts);
783 return ts.tv_sec + ts.tv_nsec * 1e-9;
784 }
785 #endif
786
787 return ev_time ();
788 }
789
790 #if EV_MULTIPLICITY
791 ev_tstamp
792 ev_now (EV_P)
793 {
794 return ev_rt_now;
795 }
796 #endif
797
798 void
799 ev_sleep (ev_tstamp delay)
800 {
801 if (delay > 0.)
802 {
803 #if EV_USE_NANOSLEEP
804 struct timespec ts;
805
806 EV_TS_SET (ts, delay);
807 nanosleep (&ts, 0);
808 #elif defined(_WIN32)
809 Sleep ((unsigned long)(delay * 1e3));
810 #else
811 struct timeval tv;
812
813 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
814 /* something not guaranteed by newer posix versions, but guaranteed */
815 /* by older ones */
816 EV_TV_SET (tv, delay);
817 select (0, 0, 0, 0, &tv);
818 #endif
819 }
820 }
821
822 /*****************************************************************************/
823
824 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
825
826 /* find a suitable new size for the given array, */
827 /* hopefully by rounding to a nice-to-malloc size */
828 inline_size int
829 array_nextsize (int elem, int cur, int cnt)
830 {
831 int ncur = cur + 1;
832
833 do
834 ncur <<= 1;
835 while (cnt > ncur);
836
837 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
838 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
839 {
840 ncur *= elem;
841 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
842 ncur = ncur - sizeof (void *) * 4;
843 ncur /= elem;
844 }
845
846 return ncur;
847 }
848
849 static noinline void *
850 array_realloc (int elem, void *base, int *cur, int cnt)
851 {
852 *cur = array_nextsize (elem, *cur, cnt);
853 return ev_realloc (base, elem * *cur);
854 }
855
856 #define array_init_zero(base,count) \
857 memset ((void *)(base), 0, sizeof (*(base)) * (count))
858
859 #define array_needsize(type,base,cur,cnt,init) \
860 if (expect_false ((cnt) > (cur))) \
861 { \
862 int ocur_ = (cur); \
863 (base) = (type *)array_realloc \
864 (sizeof (type), (base), &(cur), (cnt)); \
865 init ((base) + (ocur_), (cur) - ocur_); \
866 }
867
868 #if 0
869 #define array_slim(type,stem) \
870 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
871 { \
872 stem ## max = array_roundsize (stem ## cnt >> 1); \
873 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
874 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
875 }
876 #endif
877
878 #define array_free(stem, idx) \
879 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
880
881 /*****************************************************************************/
882
883 /* dummy callback for pending events */
884 static void noinline
885 pendingcb (EV_P_ ev_prepare *w, int revents)
886 {
887 }
888
889 void noinline
890 ev_feed_event (EV_P_ void *w, int revents)
891 {
892 W w_ = (W)w;
893 int pri = ABSPRI (w_);
894
895 if (expect_false (w_->pending))
896 pendings [pri][w_->pending - 1].events |= revents;
897 else
898 {
899 w_->pending = ++pendingcnt [pri];
900 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
901 pendings [pri][w_->pending - 1].w = w_;
902 pendings [pri][w_->pending - 1].events = revents;
903 }
904 }
905
906 inline_speed void
907 feed_reverse (EV_P_ W w)
908 {
909 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
910 rfeeds [rfeedcnt++] = w;
911 }
912
913 inline_size void
914 feed_reverse_done (EV_P_ int revents)
915 {
916 do
917 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
918 while (rfeedcnt);
919 }
920
921 inline_speed void
922 queue_events (EV_P_ W *events, int eventcnt, int type)
923 {
924 int i;
925
926 for (i = 0; i < eventcnt; ++i)
927 ev_feed_event (EV_A_ events [i], type);
928 }
929
930 /*****************************************************************************/
931
932 inline_speed void
933 fd_event_nocheck (EV_P_ int fd, int revents)
934 {
935 ANFD *anfd = anfds + fd;
936 ev_io *w;
937
938 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
939 {
940 int ev = w->events & revents;
941
942 if (ev)
943 ev_feed_event (EV_A_ (W)w, ev);
944 }
945 }
946
947 /* do not submit kernel events for fds that have reify set */
948 /* because that means they changed while we were polling for new events */
949 inline_speed void
950 fd_event (EV_P_ int fd, int revents)
951 {
952 ANFD *anfd = anfds + fd;
953
954 if (expect_true (!anfd->reify))
955 fd_event_nocheck (EV_A_ fd, revents);
956 }
957
958 void
959 ev_feed_fd_event (EV_P_ int fd, int revents)
960 {
961 if (fd >= 0 && fd < anfdmax)
962 fd_event_nocheck (EV_A_ fd, revents);
963 }
964
965 /* make sure the external fd watch events are in-sync */
966 /* with the kernel/libev internal state */
967 inline_size void
968 fd_reify (EV_P)
969 {
970 int i;
971
972 for (i = 0; i < fdchangecnt; ++i)
973 {
974 int fd = fdchanges [i];
975 ANFD *anfd = anfds + fd;
976 ev_io *w;
977
978 unsigned char o_events = anfd->events;
979 unsigned char o_reify = anfd->reify;
980
981 anfd->reify = 0;
982
983 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
984 if (o_reify & EV__IOFDSET)
985 {
986 unsigned long arg;
987 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
988 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
989 printf ("oi %d %x\n", fd, anfd->handle);//D
990 }
991 #endif
992
993 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
994 {
995 anfd->events = 0;
996
997 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
998 anfd->events |= (unsigned char)w->events;
999
1000 if (o_events != anfd->events)
1001 o_reify = EV__IOFDSET; /* actually |= */
1002 }
1003
1004 if (o_reify & EV__IOFDSET)
1005 backend_modify (EV_A_ fd, o_events, anfd->events);
1006 }
1007
1008 fdchangecnt = 0;
1009 }
1010
1011 /* something about the given fd changed */
1012 inline_size void
1013 fd_change (EV_P_ int fd, int flags)
1014 {
1015 unsigned char reify = anfds [fd].reify;
1016 anfds [fd].reify |= flags;
1017
1018 if (expect_true (!reify))
1019 {
1020 ++fdchangecnt;
1021 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1022 fdchanges [fdchangecnt - 1] = fd;
1023 }
1024 }
1025
1026 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1027 inline_speed void
1028 fd_kill (EV_P_ int fd)
1029 {
1030 ev_io *w;
1031
1032 while ((w = (ev_io *)anfds [fd].head))
1033 {
1034 ev_io_stop (EV_A_ w);
1035 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1036 }
1037 }
1038
1039 /* check whether the given fd is actually valid, for error recovery */
1040 inline_size int
1041 fd_valid (int fd)
1042 {
1043 #ifdef _WIN32
1044 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1045 #else
1046 return fcntl (fd, F_GETFD) != -1;
1047 #endif
1048 }
1049
1050 /* called on EBADF to verify fds */
1051 static void noinline
1052 fd_ebadf (EV_P)
1053 {
1054 int fd;
1055
1056 for (fd = 0; fd < anfdmax; ++fd)
1057 if (anfds [fd].events)
1058 if (!fd_valid (fd) && errno == EBADF)
1059 fd_kill (EV_A_ fd);
1060 }
1061
1062 /* called on ENOMEM in select/poll to kill some fds and retry */
1063 static void noinline
1064 fd_enomem (EV_P)
1065 {
1066 int fd;
1067
1068 for (fd = anfdmax; fd--; )
1069 if (anfds [fd].events)
1070 {
1071 fd_kill (EV_A_ fd);
1072 break;
1073 }
1074 }
1075
1076 /* usually called after fork if backend needs to re-arm all fds from scratch */
1077 static void noinline
1078 fd_rearm_all (EV_P)
1079 {
1080 int fd;
1081
1082 for (fd = 0; fd < anfdmax; ++fd)
1083 if (anfds [fd].events)
1084 {
1085 anfds [fd].events = 0;
1086 anfds [fd].emask = 0;
1087 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1088 }
1089 }
1090
1091 /* used to prepare libev internal fd's */
1092 /* this is not fork-safe */
1093 inline_speed void
1094 fd_intern (int fd)
1095 {
1096 #ifdef _WIN32
1097 unsigned long arg = 1;
1098 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1099 #else
1100 fcntl (fd, F_SETFD, FD_CLOEXEC);
1101 fcntl (fd, F_SETFL, O_NONBLOCK);
1102 #endif
1103 }
1104
1105 /*****************************************************************************/
1106
1107 /*
1108 * the heap functions want a real array index. array index 0 is guaranteed to not
1109 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1110 * the branching factor of the d-tree.
1111 */
1112
1113 /*
1114 * at the moment we allow libev the luxury of two heaps,
1115 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1116 * which is more cache-efficient.
1117 * the difference is about 5% with 50000+ watchers.
1118 */
1119 #if EV_USE_4HEAP
1120
1121 #define DHEAP 4
1122 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1123 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1124 #define UPHEAP_DONE(p,k) ((p) == (k))
1125
1126 /* away from the root */
1127 inline_speed void
1128 downheap (ANHE *heap, int N, int k)
1129 {
1130 ANHE he = heap [k];
1131 ANHE *E = heap + N + HEAP0;
1132
1133 for (;;)
1134 {
1135 ev_tstamp minat;
1136 ANHE *minpos;
1137 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1138
1139 /* find minimum child */
1140 if (expect_true (pos + DHEAP - 1 < E))
1141 {
1142 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1143 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1144 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1145 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1146 }
1147 else if (pos < E)
1148 {
1149 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1150 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1151 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1152 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1153 }
1154 else
1155 break;
1156
1157 if (ANHE_at (he) <= minat)
1158 break;
1159
1160 heap [k] = *minpos;
1161 ev_active (ANHE_w (*minpos)) = k;
1162
1163 k = minpos - heap;
1164 }
1165
1166 heap [k] = he;
1167 ev_active (ANHE_w (he)) = k;
1168 }
1169
1170 #else /* 4HEAP */
1171
1172 #define HEAP0 1
1173 #define HPARENT(k) ((k) >> 1)
1174 #define UPHEAP_DONE(p,k) (!(p))
1175
1176 /* away from the root */
1177 inline_speed void
1178 downheap (ANHE *heap, int N, int k)
1179 {
1180 ANHE he = heap [k];
1181
1182 for (;;)
1183 {
1184 int c = k << 1;
1185
1186 if (c >= N + HEAP0)
1187 break;
1188
1189 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1190 ? 1 : 0;
1191
1192 if (ANHE_at (he) <= ANHE_at (heap [c]))
1193 break;
1194
1195 heap [k] = heap [c];
1196 ev_active (ANHE_w (heap [k])) = k;
1197
1198 k = c;
1199 }
1200
1201 heap [k] = he;
1202 ev_active (ANHE_w (he)) = k;
1203 }
1204 #endif
1205
1206 /* towards the root */
1207 inline_speed void
1208 upheap (ANHE *heap, int k)
1209 {
1210 ANHE he = heap [k];
1211
1212 for (;;)
1213 {
1214 int p = HPARENT (k);
1215
1216 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1217 break;
1218
1219 heap [k] = heap [p];
1220 ev_active (ANHE_w (heap [k])) = k;
1221 k = p;
1222 }
1223
1224 heap [k] = he;
1225 ev_active (ANHE_w (he)) = k;
1226 }
1227
1228 /* move an element suitably so it is in a correct place */
1229 inline_size void
1230 adjustheap (ANHE *heap, int N, int k)
1231 {
1232 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1233 upheap (heap, k);
1234 else
1235 downheap (heap, N, k);
1236 }
1237
1238 /* rebuild the heap: this function is used only once and executed rarely */
1239 inline_size void
1240 reheap (ANHE *heap, int N)
1241 {
1242 int i;
1243
1244 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1245 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1246 for (i = 0; i < N; ++i)
1247 upheap (heap, i + HEAP0);
1248 }
1249
1250 /*****************************************************************************/
1251
1252 /* associate signal watchers to a signal signal */
1253 typedef struct
1254 {
1255 EV_ATOMIC_T pending;
1256 #if EV_MULTIPLICITY
1257 EV_P;
1258 #endif
1259 WL head;
1260 } ANSIG;
1261
1262 static ANSIG signals [EV_NSIG - 1];
1263
1264 /*****************************************************************************/
1265
1266 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1267
1268 static void noinline
1269 evpipe_init (EV_P)
1270 {
1271 if (!ev_is_active (&pipe_w))
1272 {
1273 # if EV_USE_EVENTFD
1274 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1275 if (evfd < 0 && errno == EINVAL)
1276 evfd = eventfd (0, 0);
1277
1278 if (evfd >= 0)
1279 {
1280 evpipe [0] = -1;
1281 fd_intern (evfd); /* doing it twice doesn't hurt */
1282 ev_io_set (&pipe_w, evfd, EV_READ);
1283 }
1284 else
1285 # endif
1286 {
1287 while (pipe (evpipe))
1288 ev_syserr ("(libev) error creating signal/async pipe");
1289
1290 fd_intern (evpipe [0]);
1291 fd_intern (evpipe [1]);
1292 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1293 }
1294
1295 ev_io_start (EV_A_ &pipe_w);
1296 ev_unref (EV_A); /* watcher should not keep loop alive */
1297 }
1298 }
1299
1300 inline_size void
1301 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1302 {
1303 if (!*flag)
1304 {
1305 int old_errno = errno; /* save errno because write might clobber it */
1306 char dummy;
1307
1308 *flag = 1;
1309
1310 #if EV_USE_EVENTFD
1311 if (evfd >= 0)
1312 {
1313 uint64_t counter = 1;
1314 write (evfd, &counter, sizeof (uint64_t));
1315 }
1316 else
1317 #endif
1318 /* win32 people keep sending patches that change this write() to send() */
1319 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1320 /* so when you think this write should be a send instead, please find out */
1321 /* where your send() is from - it's definitely not the microsoft send, and */
1322 /* tell me. thank you. */
1323 write (evpipe [1], &dummy, 1);
1324
1325 errno = old_errno;
1326 }
1327 }
1328
1329 /* called whenever the libev signal pipe */
1330 /* got some events (signal, async) */
1331 static void
1332 pipecb (EV_P_ ev_io *iow, int revents)
1333 {
1334 int i;
1335
1336 #if EV_USE_EVENTFD
1337 if (evfd >= 0)
1338 {
1339 uint64_t counter;
1340 read (evfd, &counter, sizeof (uint64_t));
1341 }
1342 else
1343 #endif
1344 {
1345 char dummy;
1346 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1347 read (evpipe [0], &dummy, 1);
1348 }
1349
1350 if (sig_pending)
1351 {
1352 sig_pending = 0;
1353
1354 for (i = EV_NSIG - 1; i--; )
1355 if (expect_false (signals [i].pending))
1356 ev_feed_signal_event (EV_A_ i + 1);
1357 }
1358
1359 #if EV_ASYNC_ENABLE
1360 if (async_pending)
1361 {
1362 async_pending = 0;
1363
1364 for (i = asynccnt; i--; )
1365 if (asyncs [i]->sent)
1366 {
1367 asyncs [i]->sent = 0;
1368 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1369 }
1370 }
1371 #endif
1372 }
1373
1374 /*****************************************************************************/
1375
1376 static void
1377 ev_sighandler (int signum)
1378 {
1379 #if EV_MULTIPLICITY
1380 EV_P = signals [signum - 1].loop;
1381 #endif
1382
1383 #ifdef _WIN32
1384 signal (signum, ev_sighandler);
1385 #endif
1386
1387 signals [signum - 1].pending = 1;
1388 evpipe_write (EV_A_ &sig_pending);
1389 }
1390
1391 void noinline
1392 ev_feed_signal_event (EV_P_ int signum)
1393 {
1394 WL w;
1395
1396 if (expect_false (signum <= 0 || signum > EV_NSIG))
1397 return;
1398
1399 --signum;
1400
1401 #if EV_MULTIPLICITY
1402 /* it is permissible to try to feed a signal to the wrong loop */
1403 /* or, likely more useful, feeding a signal nobody is waiting for */
1404
1405 if (expect_false (signals [signum].loop != EV_A))
1406 return;
1407 #endif
1408
1409 signals [signum].pending = 0;
1410
1411 for (w = signals [signum].head; w; w = w->next)
1412 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1413 }
1414
1415 #if EV_USE_SIGNALFD
1416 static void
1417 sigfdcb (EV_P_ ev_io *iow, int revents)
1418 {
1419 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1420
1421 for (;;)
1422 {
1423 ssize_t res = read (sigfd, si, sizeof (si));
1424
1425 /* not ISO-C, as res might be -1, but works with SuS */
1426 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1427 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1428
1429 if (res < (ssize_t)sizeof (si))
1430 break;
1431 }
1432 }
1433 #endif
1434
1435 #endif
1436
1437 /*****************************************************************************/
1438
1439 #if EV_CHILD_ENABLE
1440 static WL childs [EV_PID_HASHSIZE];
1441
1442 static ev_signal childev;
1443
1444 #ifndef WIFCONTINUED
1445 # define WIFCONTINUED(status) 0
1446 #endif
1447
1448 /* handle a single child status event */
1449 inline_speed void
1450 child_reap (EV_P_ int chain, int pid, int status)
1451 {
1452 ev_child *w;
1453 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1454
1455 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1456 {
1457 if ((w->pid == pid || !w->pid)
1458 && (!traced || (w->flags & 1)))
1459 {
1460 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1461 w->rpid = pid;
1462 w->rstatus = status;
1463 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1464 }
1465 }
1466 }
1467
1468 #ifndef WCONTINUED
1469 # define WCONTINUED 0
1470 #endif
1471
1472 /* called on sigchld etc., calls waitpid */
1473 static void
1474 childcb (EV_P_ ev_signal *sw, int revents)
1475 {
1476 int pid, status;
1477
1478 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1479 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1480 if (!WCONTINUED
1481 || errno != EINVAL
1482 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1483 return;
1484
1485 /* make sure we are called again until all children have been reaped */
1486 /* we need to do it this way so that the callback gets called before we continue */
1487 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1488
1489 child_reap (EV_A_ pid, pid, status);
1490 if ((EV_PID_HASHSIZE) > 1)
1491 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1492 }
1493
1494 #endif
1495
1496 /*****************************************************************************/
1497
1498 #if EV_USE_IOCP
1499 # include "ev_iocp.c"
1500 #endif
1501 #if EV_USE_PORT
1502 # include "ev_port.c"
1503 #endif
1504 #if EV_USE_KQUEUE
1505 # include "ev_kqueue.c"
1506 #endif
1507 #if EV_USE_EPOLL
1508 # include "ev_epoll.c"
1509 #endif
1510 #if EV_USE_POLL
1511 # include "ev_poll.c"
1512 #endif
1513 #if EV_USE_SELECT
1514 # include "ev_select.c"
1515 #endif
1516
1517 int
1518 ev_version_major (void)
1519 {
1520 return EV_VERSION_MAJOR;
1521 }
1522
1523 int
1524 ev_version_minor (void)
1525 {
1526 return EV_VERSION_MINOR;
1527 }
1528
1529 /* return true if we are running with elevated privileges and should ignore env variables */
1530 int inline_size
1531 enable_secure (void)
1532 {
1533 #ifdef _WIN32
1534 return 0;
1535 #else
1536 return getuid () != geteuid ()
1537 || getgid () != getegid ();
1538 #endif
1539 }
1540
1541 unsigned int
1542 ev_supported_backends (void)
1543 {
1544 unsigned int flags = 0;
1545
1546 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1547 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1548 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1549 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1550 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1551
1552 return flags;
1553 }
1554
1555 unsigned int
1556 ev_recommended_backends (void)
1557 {
1558 unsigned int flags = ev_supported_backends ();
1559
1560 #ifndef __NetBSD__
1561 /* kqueue is borked on everything but netbsd apparently */
1562 /* it usually doesn't work correctly on anything but sockets and pipes */
1563 flags &= ~EVBACKEND_KQUEUE;
1564 #endif
1565 #ifdef __APPLE__
1566 /* only select works correctly on that "unix-certified" platform */
1567 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1568 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1569 #endif
1570 #ifdef __FreeBSD__
1571 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1572 #endif
1573
1574 return flags;
1575 }
1576
1577 unsigned int
1578 ev_embeddable_backends (void)
1579 {
1580 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1581
1582 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1583 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1584 flags &= ~EVBACKEND_EPOLL;
1585
1586 return flags;
1587 }
1588
1589 unsigned int
1590 ev_backend (EV_P)
1591 {
1592 return backend;
1593 }
1594
1595 #if EV_FEATURE_API
1596 unsigned int
1597 ev_iteration (EV_P)
1598 {
1599 return loop_count;
1600 }
1601
1602 unsigned int
1603 ev_depth (EV_P)
1604 {
1605 return loop_depth;
1606 }
1607
1608 void
1609 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1610 {
1611 io_blocktime = interval;
1612 }
1613
1614 void
1615 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1616 {
1617 timeout_blocktime = interval;
1618 }
1619
1620 void
1621 ev_set_userdata (EV_P_ void *data)
1622 {
1623 userdata = data;
1624 }
1625
1626 void *
1627 ev_userdata (EV_P)
1628 {
1629 return userdata;
1630 }
1631
1632 void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1633 {
1634 invoke_cb = invoke_pending_cb;
1635 }
1636
1637 void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1638 {
1639 release_cb = release;
1640 acquire_cb = acquire;
1641 }
1642 #endif
1643
1644 /* initialise a loop structure, must be zero-initialised */
1645 static void noinline
1646 loop_init (EV_P_ unsigned int flags)
1647 {
1648 if (!backend)
1649 {
1650 #if EV_USE_REALTIME
1651 if (!have_realtime)
1652 {
1653 struct timespec ts;
1654
1655 if (!clock_gettime (CLOCK_REALTIME, &ts))
1656 have_realtime = 1;
1657 }
1658 #endif
1659
1660 #if EV_USE_MONOTONIC
1661 if (!have_monotonic)
1662 {
1663 struct timespec ts;
1664
1665 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1666 have_monotonic = 1;
1667 }
1668 #endif
1669
1670 /* pid check not overridable via env */
1671 #ifndef _WIN32
1672 if (flags & EVFLAG_FORKCHECK)
1673 curpid = getpid ();
1674 #endif
1675
1676 if (!(flags & EVFLAG_NOENV)
1677 && !enable_secure ()
1678 && getenv ("LIBEV_FLAGS"))
1679 flags = atoi (getenv ("LIBEV_FLAGS"));
1680
1681 ev_rt_now = ev_time ();
1682 mn_now = get_clock ();
1683 now_floor = mn_now;
1684 rtmn_diff = ev_rt_now - mn_now;
1685 #if EV_FEATURE_API
1686 invoke_cb = ev_invoke_pending;
1687 #endif
1688
1689 io_blocktime = 0.;
1690 timeout_blocktime = 0.;
1691 backend = 0;
1692 backend_fd = -1;
1693 sig_pending = 0;
1694 #if EV_ASYNC_ENABLE
1695 async_pending = 0;
1696 #endif
1697 #if EV_USE_INOTIFY
1698 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1699 #endif
1700 #if EV_USE_SIGNALFD
1701 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1702 #endif
1703
1704 if (!(flags & 0x0000ffffU))
1705 flags |= ev_recommended_backends ();
1706
1707 #if EV_USE_IOCP
1708 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1709 #endif
1710 #if EV_USE_PORT
1711 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1712 #endif
1713 #if EV_USE_KQUEUE
1714 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1715 #endif
1716 #if EV_USE_EPOLL
1717 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1718 #endif
1719 #if EV_USE_POLL
1720 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1721 #endif
1722 #if EV_USE_SELECT
1723 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1724 #endif
1725
1726 ev_prepare_init (&pending_w, pendingcb);
1727
1728 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1729 ev_init (&pipe_w, pipecb);
1730 ev_set_priority (&pipe_w, EV_MAXPRI);
1731 #endif
1732 }
1733 }
1734
1735 /* free up a loop structure */
1736 void
1737 ev_loop_destroy (EV_P)
1738 {
1739 int i;
1740
1741 #if EV_CLEANUP_ENABLE
1742 /* queue cleanup watchers (and execute them) */
1743 if (expect_false (cleanupcnt))
1744 {
1745 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1746 EV_INVOKE_PENDING;
1747 }
1748 #endif
1749
1750 #if EV_CHILD_ENABLE
1751 if (ev_is_active (&childev))
1752 {
1753 ev_ref (EV_A); /* child watcher */
1754 ev_signal_stop (EV_A_ &childev);
1755 }
1756 #endif
1757
1758 if (ev_is_active (&pipe_w))
1759 {
1760 /*ev_ref (EV_A);*/
1761 /*ev_io_stop (EV_A_ &pipe_w);*/
1762
1763 #if EV_USE_EVENTFD
1764 if (evfd >= 0)
1765 close (evfd);
1766 #endif
1767
1768 if (evpipe [0] >= 0)
1769 {
1770 EV_WIN32_CLOSE_FD (evpipe [0]);
1771 EV_WIN32_CLOSE_FD (evpipe [1]);
1772 }
1773 }
1774
1775 #if EV_USE_SIGNALFD
1776 if (ev_is_active (&sigfd_w))
1777 close (sigfd);
1778 #endif
1779
1780 #if EV_USE_INOTIFY
1781 if (fs_fd >= 0)
1782 close (fs_fd);
1783 #endif
1784
1785 if (backend_fd >= 0)
1786 close (backend_fd);
1787
1788 #if EV_USE_IOCP
1789 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1790 #endif
1791 #if EV_USE_PORT
1792 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1793 #endif
1794 #if EV_USE_KQUEUE
1795 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1796 #endif
1797 #if EV_USE_EPOLL
1798 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1799 #endif
1800 #if EV_USE_POLL
1801 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1802 #endif
1803 #if EV_USE_SELECT
1804 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1805 #endif
1806
1807 for (i = NUMPRI; i--; )
1808 {
1809 array_free (pending, [i]);
1810 #if EV_IDLE_ENABLE
1811 array_free (idle, [i]);
1812 #endif
1813 }
1814
1815 ev_free (anfds); anfds = 0; anfdmax = 0;
1816
1817 /* have to use the microsoft-never-gets-it-right macro */
1818 array_free (rfeed, EMPTY);
1819 array_free (fdchange, EMPTY);
1820 array_free (timer, EMPTY);
1821 #if EV_PERIODIC_ENABLE
1822 array_free (periodic, EMPTY);
1823 #endif
1824 #if EV_FORK_ENABLE
1825 array_free (fork, EMPTY);
1826 #endif
1827 #if EV_CLEANUP_ENABLE
1828 array_free (cleanup, EMPTY);
1829 #endif
1830 array_free (prepare, EMPTY);
1831 array_free (check, EMPTY);
1832 #if EV_ASYNC_ENABLE
1833 array_free (async, EMPTY);
1834 #endif
1835
1836 backend = 0;
1837
1838 #if EV_MULTIPLICITY
1839 if (ev_is_default_loop (EV_A))
1840 #endif
1841 ev_default_loop_ptr = 0;
1842 #if EV_MULTIPLICITY
1843 else
1844 ev_free (EV_A);
1845 #endif
1846 }
1847
1848 #if EV_USE_INOTIFY
1849 inline_size void infy_fork (EV_P);
1850 #endif
1851
1852 inline_size void
1853 loop_fork (EV_P)
1854 {
1855 #if EV_USE_PORT
1856 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1857 #endif
1858 #if EV_USE_KQUEUE
1859 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1860 #endif
1861 #if EV_USE_EPOLL
1862 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1863 #endif
1864 #if EV_USE_INOTIFY
1865 infy_fork (EV_A);
1866 #endif
1867
1868 if (ev_is_active (&pipe_w))
1869 {
1870 /* this "locks" the handlers against writing to the pipe */
1871 /* while we modify the fd vars */
1872 sig_pending = 1;
1873 #if EV_ASYNC_ENABLE
1874 async_pending = 1;
1875 #endif
1876
1877 ev_ref (EV_A);
1878 ev_io_stop (EV_A_ &pipe_w);
1879
1880 #if EV_USE_EVENTFD
1881 if (evfd >= 0)
1882 close (evfd);
1883 #endif
1884
1885 if (evpipe [0] >= 0)
1886 {
1887 EV_WIN32_CLOSE_FD (evpipe [0]);
1888 EV_WIN32_CLOSE_FD (evpipe [1]);
1889 }
1890
1891 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1892 evpipe_init (EV_A);
1893 /* now iterate over everything, in case we missed something */
1894 pipecb (EV_A_ &pipe_w, EV_READ);
1895 #endif
1896 }
1897
1898 postfork = 0;
1899 }
1900
1901 #if EV_MULTIPLICITY
1902
1903 struct ev_loop *
1904 ev_loop_new (unsigned int flags)
1905 {
1906 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1907
1908 memset (EV_A, 0, sizeof (struct ev_loop));
1909 loop_init (EV_A_ flags);
1910
1911 if (ev_backend (EV_A))
1912 return EV_A;
1913
1914 ev_free (EV_A);
1915 return 0;
1916 }
1917
1918 #endif /* multiplicity */
1919
1920 #if EV_VERIFY
1921 static void noinline
1922 verify_watcher (EV_P_ W w)
1923 {
1924 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1925
1926 if (w->pending)
1927 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1928 }
1929
1930 static void noinline
1931 verify_heap (EV_P_ ANHE *heap, int N)
1932 {
1933 int i;
1934
1935 for (i = HEAP0; i < N + HEAP0; ++i)
1936 {
1937 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1938 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1939 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1940
1941 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1942 }
1943 }
1944
1945 static void noinline
1946 array_verify (EV_P_ W *ws, int cnt)
1947 {
1948 while (cnt--)
1949 {
1950 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1951 verify_watcher (EV_A_ ws [cnt]);
1952 }
1953 }
1954 #endif
1955
1956 #if EV_FEATURE_API
1957 void
1958 ev_verify (EV_P)
1959 {
1960 #if EV_VERIFY
1961 int i;
1962 WL w;
1963
1964 assert (activecnt >= -1);
1965
1966 assert (fdchangemax >= fdchangecnt);
1967 for (i = 0; i < fdchangecnt; ++i)
1968 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1969
1970 assert (anfdmax >= 0);
1971 for (i = 0; i < anfdmax; ++i)
1972 for (w = anfds [i].head; w; w = w->next)
1973 {
1974 verify_watcher (EV_A_ (W)w);
1975 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
1976 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1977 }
1978
1979 assert (timermax >= timercnt);
1980 verify_heap (EV_A_ timers, timercnt);
1981
1982 #if EV_PERIODIC_ENABLE
1983 assert (periodicmax >= periodiccnt);
1984 verify_heap (EV_A_ periodics, periodiccnt);
1985 #endif
1986
1987 for (i = NUMPRI; i--; )
1988 {
1989 assert (pendingmax [i] >= pendingcnt [i]);
1990 #if EV_IDLE_ENABLE
1991 assert (idleall >= 0);
1992 assert (idlemax [i] >= idlecnt [i]);
1993 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1994 #endif
1995 }
1996
1997 #if EV_FORK_ENABLE
1998 assert (forkmax >= forkcnt);
1999 array_verify (EV_A_ (W *)forks, forkcnt);
2000 #endif
2001
2002 #if EV_CLEANUP_ENABLE
2003 assert (cleanupmax >= cleanupcnt);
2004 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2005 #endif
2006
2007 #if EV_ASYNC_ENABLE
2008 assert (asyncmax >= asynccnt);
2009 array_verify (EV_A_ (W *)asyncs, asynccnt);
2010 #endif
2011
2012 #if EV_PREPARE_ENABLE
2013 assert (preparemax >= preparecnt);
2014 array_verify (EV_A_ (W *)prepares, preparecnt);
2015 #endif
2016
2017 #if EV_CHECK_ENABLE
2018 assert (checkmax >= checkcnt);
2019 array_verify (EV_A_ (W *)checks, checkcnt);
2020 #endif
2021
2022 # if 0
2023 #if EV_CHILD_ENABLE
2024 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2025 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2026 #endif
2027 # endif
2028 #endif
2029 }
2030 #endif
2031
2032 #if EV_MULTIPLICITY
2033 struct ev_loop *
2034 #else
2035 int
2036 #endif
2037 ev_default_loop (unsigned int flags)
2038 {
2039 if (!ev_default_loop_ptr)
2040 {
2041 #if EV_MULTIPLICITY
2042 EV_P = ev_default_loop_ptr = &default_loop_struct;
2043 #else
2044 ev_default_loop_ptr = 1;
2045 #endif
2046
2047 loop_init (EV_A_ flags);
2048
2049 if (ev_backend (EV_A))
2050 {
2051 #if EV_CHILD_ENABLE
2052 ev_signal_init (&childev, childcb, SIGCHLD);
2053 ev_set_priority (&childev, EV_MAXPRI);
2054 ev_signal_start (EV_A_ &childev);
2055 ev_unref (EV_A); /* child watcher should not keep loop alive */
2056 #endif
2057 }
2058 else
2059 ev_default_loop_ptr = 0;
2060 }
2061
2062 return ev_default_loop_ptr;
2063 }
2064
2065 void
2066 ev_loop_fork (EV_P)
2067 {
2068 postfork = 1; /* must be in line with ev_default_fork */
2069 }
2070
2071 /*****************************************************************************/
2072
2073 void
2074 ev_invoke (EV_P_ void *w, int revents)
2075 {
2076 EV_CB_INVOKE ((W)w, revents);
2077 }
2078
2079 unsigned int
2080 ev_pending_count (EV_P)
2081 {
2082 int pri;
2083 unsigned int count = 0;
2084
2085 for (pri = NUMPRI; pri--; )
2086 count += pendingcnt [pri];
2087
2088 return count;
2089 }
2090
2091 void noinline
2092 ev_invoke_pending (EV_P)
2093 {
2094 int pri;
2095
2096 for (pri = NUMPRI; pri--; )
2097 while (pendingcnt [pri])
2098 {
2099 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2100
2101 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
2102 /* ^ this is no longer true, as pending_w could be here */
2103
2104 p->w->pending = 0;
2105 EV_CB_INVOKE (p->w, p->events);
2106 EV_FREQUENT_CHECK;
2107 }
2108 }
2109
2110 #if EV_IDLE_ENABLE
2111 /* make idle watchers pending. this handles the "call-idle */
2112 /* only when higher priorities are idle" logic */
2113 inline_size void
2114 idle_reify (EV_P)
2115 {
2116 if (expect_false (idleall))
2117 {
2118 int pri;
2119
2120 for (pri = NUMPRI; pri--; )
2121 {
2122 if (pendingcnt [pri])
2123 break;
2124
2125 if (idlecnt [pri])
2126 {
2127 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2128 break;
2129 }
2130 }
2131 }
2132 }
2133 #endif
2134
2135 /* make timers pending */
2136 inline_size void
2137 timers_reify (EV_P)
2138 {
2139 EV_FREQUENT_CHECK;
2140
2141 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2142 {
2143 do
2144 {
2145 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2146
2147 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2148
2149 /* first reschedule or stop timer */
2150 if (w->repeat)
2151 {
2152 ev_at (w) += w->repeat;
2153 if (ev_at (w) < mn_now)
2154 ev_at (w) = mn_now;
2155
2156 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2157
2158 ANHE_at_cache (timers [HEAP0]);
2159 downheap (timers, timercnt, HEAP0);
2160 }
2161 else
2162 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2163
2164 EV_FREQUENT_CHECK;
2165 feed_reverse (EV_A_ (W)w);
2166 }
2167 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2168
2169 feed_reverse_done (EV_A_ EV_TIMER);
2170 }
2171 }
2172
2173 #if EV_PERIODIC_ENABLE
2174 /* make periodics pending */
2175 inline_size void
2176 periodics_reify (EV_P)
2177 {
2178 EV_FREQUENT_CHECK;
2179
2180 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2181 {
2182 int feed_count = 0;
2183
2184 do
2185 {
2186 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2187
2188 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2189
2190 /* first reschedule or stop timer */
2191 if (w->reschedule_cb)
2192 {
2193 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2194
2195 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2196
2197 ANHE_at_cache (periodics [HEAP0]);
2198 downheap (periodics, periodiccnt, HEAP0);
2199 }
2200 else if (w->interval)
2201 {
2202 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2203 /* if next trigger time is not sufficiently in the future, put it there */
2204 /* this might happen because of floating point inexactness */
2205 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2206 {
2207 ev_at (w) += w->interval;
2208
2209 /* if interval is unreasonably low we might still have a time in the past */
2210 /* so correct this. this will make the periodic very inexact, but the user */
2211 /* has effectively asked to get triggered more often than possible */
2212 if (ev_at (w) < ev_rt_now)
2213 ev_at (w) = ev_rt_now;
2214 }
2215
2216 ANHE_at_cache (periodics [HEAP0]);
2217 downheap (periodics, periodiccnt, HEAP0);
2218 }
2219 else
2220 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2221
2222 EV_FREQUENT_CHECK;
2223 feed_reverse (EV_A_ (W)w);
2224 }
2225 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2226
2227 feed_reverse_done (EV_A_ EV_PERIODIC);
2228 }
2229 }
2230
2231 /* simply recalculate all periodics */
2232 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2233 static void noinline
2234 periodics_reschedule (EV_P)
2235 {
2236 int i;
2237
2238 /* adjust periodics after time jump */
2239 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2240 {
2241 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2242
2243 if (w->reschedule_cb)
2244 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2245 else if (w->interval)
2246 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2247
2248 ANHE_at_cache (periodics [i]);
2249 }
2250
2251 reheap (periodics, periodiccnt);
2252 }
2253 #endif
2254
2255 /* adjust all timers by a given offset */
2256 static void noinline
2257 timers_reschedule (EV_P_ ev_tstamp adjust)
2258 {
2259 int i;
2260
2261 for (i = 0; i < timercnt; ++i)
2262 {
2263 ANHE *he = timers + i + HEAP0;
2264 ANHE_w (*he)->at += adjust;
2265 ANHE_at_cache (*he);
2266 }
2267 }
2268
2269 /* fetch new monotonic and realtime times from the kernel */
2270 /* also detect if there was a timejump, and act accordingly */
2271 inline_speed void
2272 time_update (EV_P_ ev_tstamp max_block)
2273 {
2274 #if EV_USE_MONOTONIC
2275 if (expect_true (have_monotonic))
2276 {
2277 int i;
2278 ev_tstamp odiff = rtmn_diff;
2279
2280 mn_now = get_clock ();
2281
2282 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2283 /* interpolate in the meantime */
2284 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2285 {
2286 ev_rt_now = rtmn_diff + mn_now;
2287 return;
2288 }
2289
2290 now_floor = mn_now;
2291 ev_rt_now = ev_time ();
2292
2293 /* loop a few times, before making important decisions.
2294 * on the choice of "4": one iteration isn't enough,
2295 * in case we get preempted during the calls to
2296 * ev_time and get_clock. a second call is almost guaranteed
2297 * to succeed in that case, though. and looping a few more times
2298 * doesn't hurt either as we only do this on time-jumps or
2299 * in the unlikely event of having been preempted here.
2300 */
2301 for (i = 4; --i; )
2302 {
2303 rtmn_diff = ev_rt_now - mn_now;
2304
2305 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2306 return; /* all is well */
2307
2308 ev_rt_now = ev_time ();
2309 mn_now = get_clock ();
2310 now_floor = mn_now;
2311 }
2312
2313 /* no timer adjustment, as the monotonic clock doesn't jump */
2314 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2315 # if EV_PERIODIC_ENABLE
2316 periodics_reschedule (EV_A);
2317 # endif
2318 }
2319 else
2320 #endif
2321 {
2322 ev_rt_now = ev_time ();
2323
2324 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2325 {
2326 /* adjust timers. this is easy, as the offset is the same for all of them */
2327 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2328 #if EV_PERIODIC_ENABLE
2329 periodics_reschedule (EV_A);
2330 #endif
2331 }
2332
2333 mn_now = ev_rt_now;
2334 }
2335 }
2336
2337 void
2338 ev_run (EV_P_ int flags)
2339 {
2340 #if EV_FEATURE_API
2341 ++loop_depth;
2342 #endif
2343
2344 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2345
2346 loop_done = EVBREAK_CANCEL;
2347
2348 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2349
2350 do
2351 {
2352 #if EV_VERIFY >= 2
2353 ev_verify (EV_A);
2354 #endif
2355
2356 #ifndef _WIN32
2357 if (expect_false (curpid)) /* penalise the forking check even more */
2358 if (expect_false (getpid () != curpid))
2359 {
2360 curpid = getpid ();
2361 postfork = 1;
2362 }
2363 #endif
2364
2365 #if EV_FORK_ENABLE
2366 /* we might have forked, so queue fork handlers */
2367 if (expect_false (postfork))
2368 if (forkcnt)
2369 {
2370 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2371 EV_INVOKE_PENDING;
2372 }
2373 #endif
2374
2375 #if EV_PREPARE_ENABLE
2376 /* queue prepare watchers (and execute them) */
2377 if (expect_false (preparecnt))
2378 {
2379 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2380 EV_INVOKE_PENDING;
2381 }
2382 #endif
2383
2384 if (expect_false (loop_done))
2385 break;
2386
2387 /* we might have forked, so reify kernel state if necessary */
2388 if (expect_false (postfork))
2389 loop_fork (EV_A);
2390
2391 /* update fd-related kernel structures */
2392 fd_reify (EV_A);
2393
2394 /* calculate blocking time */
2395 {
2396 ev_tstamp waittime = 0.;
2397 ev_tstamp sleeptime = 0.;
2398
2399 /* remember old timestamp for io_blocktime calculation */
2400 ev_tstamp prev_mn_now = mn_now;
2401
2402 /* update time to cancel out callback processing overhead */
2403 time_update (EV_A_ 1e100);
2404
2405 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt)))
2406 {
2407 waittime = MAX_BLOCKTIME;
2408
2409 if (timercnt)
2410 {
2411 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2412 if (waittime > to) waittime = to;
2413 }
2414
2415 #if EV_PERIODIC_ENABLE
2416 if (periodiccnt)
2417 {
2418 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2419 if (waittime > to) waittime = to;
2420 }
2421 #endif
2422
2423 /* don't let timeouts decrease the waittime below timeout_blocktime */
2424 if (expect_false (waittime < timeout_blocktime))
2425 waittime = timeout_blocktime;
2426
2427 /* extra check because io_blocktime is commonly 0 */
2428 if (expect_false (io_blocktime))
2429 {
2430 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2431
2432 if (sleeptime > waittime - backend_fudge)
2433 sleeptime = waittime - backend_fudge;
2434
2435 if (expect_true (sleeptime > 0.))
2436 {
2437 ev_sleep (sleeptime);
2438 waittime -= sleeptime;
2439 }
2440 }
2441 }
2442
2443 #if EV_FEATURE_API
2444 ++loop_count;
2445 #endif
2446 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2447 backend_poll (EV_A_ waittime);
2448 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2449
2450 /* update ev_rt_now, do magic */
2451 time_update (EV_A_ waittime + sleeptime);
2452 }
2453
2454 /* queue pending timers and reschedule them */
2455 timers_reify (EV_A); /* relative timers called last */
2456 #if EV_PERIODIC_ENABLE
2457 periodics_reify (EV_A); /* absolute timers called first */
2458 #endif
2459
2460 #if EV_IDLE_ENABLE
2461 /* queue idle watchers unless other events are pending */
2462 idle_reify (EV_A);
2463 #endif
2464
2465 #if EV_CHECK_ENABLE
2466 /* queue check watchers, to be executed first */
2467 if (expect_false (checkcnt))
2468 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2469 #endif
2470
2471 EV_INVOKE_PENDING;
2472 }
2473 while (expect_true (
2474 activecnt
2475 && !loop_done
2476 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2477 ));
2478
2479 if (loop_done == EVBREAK_ONE)
2480 loop_done = EVBREAK_CANCEL;
2481
2482 #if EV_FEATURE_API
2483 --loop_depth;
2484 #endif
2485 }
2486
2487 void
2488 ev_break (EV_P_ int how)
2489 {
2490 loop_done = how;
2491 }
2492
2493 void
2494 ev_ref (EV_P)
2495 {
2496 ++activecnt;
2497 }
2498
2499 void
2500 ev_unref (EV_P)
2501 {
2502 --activecnt;
2503 }
2504
2505 void
2506 ev_now_update (EV_P)
2507 {
2508 time_update (EV_A_ 1e100);
2509 }
2510
2511 void
2512 ev_suspend (EV_P)
2513 {
2514 ev_now_update (EV_A);
2515 }
2516
2517 void
2518 ev_resume (EV_P)
2519 {
2520 ev_tstamp mn_prev = mn_now;
2521
2522 ev_now_update (EV_A);
2523 timers_reschedule (EV_A_ mn_now - mn_prev);
2524 #if EV_PERIODIC_ENABLE
2525 /* TODO: really do this? */
2526 periodics_reschedule (EV_A);
2527 #endif
2528 }
2529
2530 /*****************************************************************************/
2531 /* singly-linked list management, used when the expected list length is short */
2532
2533 inline_size void
2534 wlist_add (WL *head, WL elem)
2535 {
2536 elem->next = *head;
2537 *head = elem;
2538 }
2539
2540 inline_size void
2541 wlist_del (WL *head, WL elem)
2542 {
2543 while (*head)
2544 {
2545 if (expect_true (*head == elem))
2546 {
2547 *head = elem->next;
2548 break;
2549 }
2550
2551 head = &(*head)->next;
2552 }
2553 }
2554
2555 /* internal, faster, version of ev_clear_pending */
2556 inline_speed void
2557 clear_pending (EV_P_ W w)
2558 {
2559 if (w->pending)
2560 {
2561 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2562 w->pending = 0;
2563 }
2564 }
2565
2566 int
2567 ev_clear_pending (EV_P_ void *w)
2568 {
2569 W w_ = (W)w;
2570 int pending = w_->pending;
2571
2572 if (expect_true (pending))
2573 {
2574 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2575 p->w = (W)&pending_w;
2576 w_->pending = 0;
2577 return p->events;
2578 }
2579 else
2580 return 0;
2581 }
2582
2583 inline_size void
2584 pri_adjust (EV_P_ W w)
2585 {
2586 int pri = ev_priority (w);
2587 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2588 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2589 ev_set_priority (w, pri);
2590 }
2591
2592 inline_speed void
2593 ev_start (EV_P_ W w, int active)
2594 {
2595 pri_adjust (EV_A_ w);
2596 w->active = active;
2597 ev_ref (EV_A);
2598 }
2599
2600 inline_size void
2601 ev_stop (EV_P_ W w)
2602 {
2603 ev_unref (EV_A);
2604 w->active = 0;
2605 }
2606
2607 /*****************************************************************************/
2608
2609 void noinline
2610 ev_io_start (EV_P_ ev_io *w)
2611 {
2612 int fd = w->fd;
2613
2614 if (expect_false (ev_is_active (w)))
2615 return;
2616
2617 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2618 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2619
2620 EV_FREQUENT_CHECK;
2621
2622 ev_start (EV_A_ (W)w, 1);
2623 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2624 wlist_add (&anfds[fd].head, (WL)w);
2625
2626 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2627 w->events &= ~EV__IOFDSET;
2628
2629 EV_FREQUENT_CHECK;
2630 }
2631
2632 void noinline
2633 ev_io_stop (EV_P_ ev_io *w)
2634 {
2635 clear_pending (EV_A_ (W)w);
2636 if (expect_false (!ev_is_active (w)))
2637 return;
2638
2639 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2640
2641 EV_FREQUENT_CHECK;
2642
2643 wlist_del (&anfds[w->fd].head, (WL)w);
2644 ev_stop (EV_A_ (W)w);
2645
2646 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2647
2648 EV_FREQUENT_CHECK;
2649 }
2650
2651 void noinline
2652 ev_timer_start (EV_P_ ev_timer *w)
2653 {
2654 if (expect_false (ev_is_active (w)))
2655 return;
2656
2657 ev_at (w) += mn_now;
2658
2659 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2660
2661 EV_FREQUENT_CHECK;
2662
2663 ++timercnt;
2664 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2665 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2666 ANHE_w (timers [ev_active (w)]) = (WT)w;
2667 ANHE_at_cache (timers [ev_active (w)]);
2668 upheap (timers, ev_active (w));
2669
2670 EV_FREQUENT_CHECK;
2671
2672 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2673 }
2674
2675 void noinline
2676 ev_timer_stop (EV_P_ ev_timer *w)
2677 {
2678 clear_pending (EV_A_ (W)w);
2679 if (expect_false (!ev_is_active (w)))
2680 return;
2681
2682 EV_FREQUENT_CHECK;
2683
2684 {
2685 int active = ev_active (w);
2686
2687 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2688
2689 --timercnt;
2690
2691 if (expect_true (active < timercnt + HEAP0))
2692 {
2693 timers [active] = timers [timercnt + HEAP0];
2694 adjustheap (timers, timercnt, active);
2695 }
2696 }
2697
2698 ev_at (w) -= mn_now;
2699
2700 ev_stop (EV_A_ (W)w);
2701
2702 EV_FREQUENT_CHECK;
2703 }
2704
2705 void noinline
2706 ev_timer_again (EV_P_ ev_timer *w)
2707 {
2708 EV_FREQUENT_CHECK;
2709
2710 if (ev_is_active (w))
2711 {
2712 if (w->repeat)
2713 {
2714 ev_at (w) = mn_now + w->repeat;
2715 ANHE_at_cache (timers [ev_active (w)]);
2716 adjustheap (timers, timercnt, ev_active (w));
2717 }
2718 else
2719 ev_timer_stop (EV_A_ w);
2720 }
2721 else if (w->repeat)
2722 {
2723 ev_at (w) = w->repeat;
2724 ev_timer_start (EV_A_ w);
2725 }
2726
2727 EV_FREQUENT_CHECK;
2728 }
2729
2730 ev_tstamp
2731 ev_timer_remaining (EV_P_ ev_timer *w)
2732 {
2733 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2734 }
2735
2736 #if EV_PERIODIC_ENABLE
2737 void noinline
2738 ev_periodic_start (EV_P_ ev_periodic *w)
2739 {
2740 if (expect_false (ev_is_active (w)))
2741 return;
2742
2743 if (w->reschedule_cb)
2744 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2745 else if (w->interval)
2746 {
2747 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2748 /* this formula differs from the one in periodic_reify because we do not always round up */
2749 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2750 }
2751 else
2752 ev_at (w) = w->offset;
2753
2754 EV_FREQUENT_CHECK;
2755
2756 ++periodiccnt;
2757 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2758 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2759 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2760 ANHE_at_cache (periodics [ev_active (w)]);
2761 upheap (periodics, ev_active (w));
2762
2763 EV_FREQUENT_CHECK;
2764
2765 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2766 }
2767
2768 void noinline
2769 ev_periodic_stop (EV_P_ ev_periodic *w)
2770 {
2771 clear_pending (EV_A_ (W)w);
2772 if (expect_false (!ev_is_active (w)))
2773 return;
2774
2775 EV_FREQUENT_CHECK;
2776
2777 {
2778 int active = ev_active (w);
2779
2780 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2781
2782 --periodiccnt;
2783
2784 if (expect_true (active < periodiccnt + HEAP0))
2785 {
2786 periodics [active] = periodics [periodiccnt + HEAP0];
2787 adjustheap (periodics, periodiccnt, active);
2788 }
2789 }
2790
2791 ev_stop (EV_A_ (W)w);
2792
2793 EV_FREQUENT_CHECK;
2794 }
2795
2796 void noinline
2797 ev_periodic_again (EV_P_ ev_periodic *w)
2798 {
2799 /* TODO: use adjustheap and recalculation */
2800 ev_periodic_stop (EV_A_ w);
2801 ev_periodic_start (EV_A_ w);
2802 }
2803 #endif
2804
2805 #ifndef SA_RESTART
2806 # define SA_RESTART 0
2807 #endif
2808
2809 #if EV_SIGNAL_ENABLE
2810
2811 void noinline
2812 ev_signal_start (EV_P_ ev_signal *w)
2813 {
2814 if (expect_false (ev_is_active (w)))
2815 return;
2816
2817 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2818
2819 #if EV_MULTIPLICITY
2820 assert (("libev: a signal must not be attached to two different loops",
2821 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2822
2823 signals [w->signum - 1].loop = EV_A;
2824 #endif
2825
2826 EV_FREQUENT_CHECK;
2827
2828 #if EV_USE_SIGNALFD
2829 if (sigfd == -2)
2830 {
2831 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2832 if (sigfd < 0 && errno == EINVAL)
2833 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2834
2835 if (sigfd >= 0)
2836 {
2837 fd_intern (sigfd); /* doing it twice will not hurt */
2838
2839 sigemptyset (&sigfd_set);
2840
2841 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2842 ev_set_priority (&sigfd_w, EV_MAXPRI);
2843 ev_io_start (EV_A_ &sigfd_w);
2844 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2845 }
2846 }
2847
2848 if (sigfd >= 0)
2849 {
2850 /* TODO: check .head */
2851 sigaddset (&sigfd_set, w->signum);
2852 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2853
2854 signalfd (sigfd, &sigfd_set, 0);
2855 }
2856 #endif
2857
2858 ev_start (EV_A_ (W)w, 1);
2859 wlist_add (&signals [w->signum - 1].head, (WL)w);
2860
2861 if (!((WL)w)->next)
2862 # if EV_USE_SIGNALFD
2863 if (sigfd < 0) /*TODO*/
2864 # endif
2865 {
2866 # ifdef _WIN32
2867 evpipe_init (EV_A);
2868
2869 signal (w->signum, ev_sighandler);
2870 # else
2871 struct sigaction sa;
2872
2873 evpipe_init (EV_A);
2874
2875 sa.sa_handler = ev_sighandler;
2876 sigfillset (&sa.sa_mask);
2877 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2878 sigaction (w->signum, &sa, 0);
2879
2880 sigemptyset (&sa.sa_mask);
2881 sigaddset (&sa.sa_mask, w->signum);
2882 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2883 #endif
2884 }
2885
2886 EV_FREQUENT_CHECK;
2887 }
2888
2889 void noinline
2890 ev_signal_stop (EV_P_ ev_signal *w)
2891 {
2892 clear_pending (EV_A_ (W)w);
2893 if (expect_false (!ev_is_active (w)))
2894 return;
2895
2896 EV_FREQUENT_CHECK;
2897
2898 wlist_del (&signals [w->signum - 1].head, (WL)w);
2899 ev_stop (EV_A_ (W)w);
2900
2901 if (!signals [w->signum - 1].head)
2902 {
2903 #if EV_MULTIPLICITY
2904 signals [w->signum - 1].loop = 0; /* unattach from signal */
2905 #endif
2906 #if EV_USE_SIGNALFD
2907 if (sigfd >= 0)
2908 {
2909 sigset_t ss;
2910
2911 sigemptyset (&ss);
2912 sigaddset (&ss, w->signum);
2913 sigdelset (&sigfd_set, w->signum);
2914
2915 signalfd (sigfd, &sigfd_set, 0);
2916 sigprocmask (SIG_UNBLOCK, &ss, 0);
2917 }
2918 else
2919 #endif
2920 signal (w->signum, SIG_DFL);
2921 }
2922
2923 EV_FREQUENT_CHECK;
2924 }
2925
2926 #endif
2927
2928 #if EV_CHILD_ENABLE
2929
2930 void
2931 ev_child_start (EV_P_ ev_child *w)
2932 {
2933 #if EV_MULTIPLICITY
2934 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2935 #endif
2936 if (expect_false (ev_is_active (w)))
2937 return;
2938
2939 EV_FREQUENT_CHECK;
2940
2941 ev_start (EV_A_ (W)w, 1);
2942 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2943
2944 EV_FREQUENT_CHECK;
2945 }
2946
2947 void
2948 ev_child_stop (EV_P_ ev_child *w)
2949 {
2950 clear_pending (EV_A_ (W)w);
2951 if (expect_false (!ev_is_active (w)))
2952 return;
2953
2954 EV_FREQUENT_CHECK;
2955
2956 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
2957 ev_stop (EV_A_ (W)w);
2958
2959 EV_FREQUENT_CHECK;
2960 }
2961
2962 #endif
2963
2964 #if EV_STAT_ENABLE
2965
2966 # ifdef _WIN32
2967 # undef lstat
2968 # define lstat(a,b) _stati64 (a,b)
2969 # endif
2970
2971 #define DEF_STAT_INTERVAL 5.0074891
2972 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2973 #define MIN_STAT_INTERVAL 0.1074891
2974
2975 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2976
2977 #if EV_USE_INOTIFY
2978
2979 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
2980 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
2981
2982 static void noinline
2983 infy_add (EV_P_ ev_stat *w)
2984 {
2985 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);
2986
2987 if (w->wd >= 0)
2988 {
2989 struct statfs sfs;
2990
2991 /* now local changes will be tracked by inotify, but remote changes won't */
2992 /* unless the filesystem is known to be local, we therefore still poll */
2993 /* also do poll on <2.6.25, but with normal frequency */
2994
2995 if (!fs_2625)
2996 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2997 else if (!statfs (w->path, &sfs)
2998 && (sfs.f_type == 0x1373 /* devfs */
2999 || sfs.f_type == 0xEF53 /* ext2/3 */
3000 || sfs.f_type == 0x3153464a /* jfs */
3001 || sfs.f_type == 0x52654973 /* reiser3 */
3002 || sfs.f_type == 0x01021994 /* tempfs */
3003 || sfs.f_type == 0x58465342 /* xfs */))
3004 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3005 else
3006 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3007 }
3008 else
3009 {
3010 /* can't use inotify, continue to stat */
3011 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3012
3013 /* if path is not there, monitor some parent directory for speedup hints */
3014 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3015 /* but an efficiency issue only */
3016 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3017 {
3018 char path [4096];
3019 strcpy (path, w->path);
3020
3021 do
3022 {
3023 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3024 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3025
3026 char *pend = strrchr (path, '/');
3027
3028 if (!pend || pend == path)
3029 break;
3030
3031 *pend = 0;
3032 w->wd = inotify_add_watch (fs_fd, path, mask);
3033 }
3034 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3035 }
3036 }
3037
3038 if (w->wd >= 0)
3039 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3040
3041 /* now re-arm timer, if required */
3042 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3043 ev_timer_again (EV_A_ &w->timer);
3044 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3045 }
3046
3047 static void noinline
3048 infy_del (EV_P_ ev_stat *w)
3049 {
3050 int slot;
3051 int wd = w->wd;
3052
3053 if (wd < 0)
3054 return;
3055
3056 w->wd = -2;
3057 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3058 wlist_del (&fs_hash [slot].head, (WL)w);
3059
3060 /* remove this watcher, if others are watching it, they will rearm */
3061 inotify_rm_watch (fs_fd, wd);
3062 }
3063
3064 static void noinline
3065 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3066 {
3067 if (slot < 0)
3068 /* overflow, need to check for all hash slots */
3069 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3070 infy_wd (EV_A_ slot, wd, ev);
3071 else
3072 {
3073 WL w_;
3074
3075 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3076 {
3077 ev_stat *w = (ev_stat *)w_;
3078 w_ = w_->next; /* lets us remove this watcher and all before it */
3079
3080 if (w->wd == wd || wd == -1)
3081 {
3082 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3083 {
3084 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3085 w->wd = -1;
3086 infy_add (EV_A_ w); /* re-add, no matter what */
3087 }
3088
3089 stat_timer_cb (EV_A_ &w->timer, 0);
3090 }
3091 }
3092 }
3093 }
3094
3095 static void
3096 infy_cb (EV_P_ ev_io *w, int revents)
3097 {
3098 char buf [EV_INOTIFY_BUFSIZE];
3099 int ofs;
3100 int len = read (fs_fd, buf, sizeof (buf));
3101
3102 for (ofs = 0; ofs < len; )
3103 {
3104 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3105 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3106 ofs += sizeof (struct inotify_event) + ev->len;
3107 }
3108 }
3109
3110 inline_size void
3111 ev_check_2625 (EV_P)
3112 {
3113 /* kernels < 2.6.25 are borked
3114 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3115 */
3116 if (ev_linux_version () < 0x020619)
3117 return;
3118
3119 fs_2625 = 1;
3120 }
3121
3122 inline_size int
3123 infy_newfd (void)
3124 {
3125 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3126 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3127 if (fd >= 0)
3128 return fd;
3129 #endif
3130 return inotify_init ();
3131 }
3132
3133 inline_size void
3134 infy_init (EV_P)
3135 {
3136 if (fs_fd != -2)
3137 return;
3138
3139 fs_fd = -1;
3140
3141 ev_check_2625 (EV_A);
3142
3143 fs_fd = infy_newfd ();
3144
3145 if (fs_fd >= 0)
3146 {
3147 fd_intern (fs_fd);
3148 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3149 ev_set_priority (&fs_w, EV_MAXPRI);
3150 ev_io_start (EV_A_ &fs_w);
3151 ev_unref (EV_A);
3152 }
3153 }
3154
3155 inline_size void
3156 infy_fork (EV_P)
3157 {
3158 int slot;
3159
3160 if (fs_fd < 0)
3161 return;
3162
3163 ev_ref (EV_A);
3164 ev_io_stop (EV_A_ &fs_w);
3165 close (fs_fd);
3166 fs_fd = infy_newfd ();
3167
3168 if (fs_fd >= 0)
3169 {
3170 fd_intern (fs_fd);
3171 ev_io_set (&fs_w, fs_fd, EV_READ);
3172 ev_io_start (EV_A_ &fs_w);
3173 ev_unref (EV_A);
3174 }
3175
3176 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3177 {
3178 WL w_ = fs_hash [slot].head;
3179 fs_hash [slot].head = 0;
3180
3181 while (w_)
3182 {
3183 ev_stat *w = (ev_stat *)w_;
3184 w_ = w_->next; /* lets us add this watcher */
3185
3186 w->wd = -1;
3187
3188 if (fs_fd >= 0)
3189 infy_add (EV_A_ w); /* re-add, no matter what */
3190 else
3191 {
3192 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3193 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3194 ev_timer_again (EV_A_ &w->timer);
3195 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3196 }
3197 }
3198 }
3199 }
3200
3201 #endif
3202
3203 #ifdef _WIN32
3204 # define EV_LSTAT(p,b) _stati64 (p, b)
3205 #else
3206 # define EV_LSTAT(p,b) lstat (p, b)
3207 #endif
3208
3209 void
3210 ev_stat_stat (EV_P_ ev_stat *w)
3211 {
3212 if (lstat (w->path, &w->attr) < 0)
3213 w->attr.st_nlink = 0;
3214 else if (!w->attr.st_nlink)
3215 w->attr.st_nlink = 1;
3216 }
3217
3218 static void noinline
3219 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3220 {
3221 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3222
3223 ev_statdata prev = w->attr;
3224 ev_stat_stat (EV_A_ w);
3225
3226 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3227 if (
3228 prev.st_dev != w->attr.st_dev
3229 || prev.st_ino != w->attr.st_ino
3230 || prev.st_mode != w->attr.st_mode
3231 || prev.st_nlink != w->attr.st_nlink
3232 || prev.st_uid != w->attr.st_uid
3233 || prev.st_gid != w->attr.st_gid
3234 || prev.st_rdev != w->attr.st_rdev
3235 || prev.st_size != w->attr.st_size
3236 || prev.st_atime != w->attr.st_atime
3237 || prev.st_mtime != w->attr.st_mtime
3238 || prev.st_ctime != w->attr.st_ctime
3239 ) {
3240 /* we only update w->prev on actual differences */
3241 /* in case we test more often than invoke the callback, */
3242 /* to ensure that prev is always different to attr */
3243 w->prev = prev;
3244
3245 #if EV_USE_INOTIFY
3246 if (fs_fd >= 0)
3247 {
3248 infy_del (EV_A_ w);
3249 infy_add (EV_A_ w);
3250 ev_stat_stat (EV_A_ w); /* avoid race... */
3251 }
3252 #endif
3253
3254 ev_feed_event (EV_A_ w, EV_STAT);
3255 }
3256 }
3257
3258 void
3259 ev_stat_start (EV_P_ ev_stat *w)
3260 {
3261 if (expect_false (ev_is_active (w)))
3262 return;
3263
3264 ev_stat_stat (EV_A_ w);
3265
3266 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3267 w->interval = MIN_STAT_INTERVAL;
3268
3269 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3270 ev_set_priority (&w->timer, ev_priority (w));
3271
3272 #if EV_USE_INOTIFY
3273 infy_init (EV_A);
3274
3275 if (fs_fd >= 0)
3276 infy_add (EV_A_ w);
3277 else
3278 #endif
3279 {
3280 ev_timer_again (EV_A_ &w->timer);
3281 ev_unref (EV_A);
3282 }
3283
3284 ev_start (EV_A_ (W)w, 1);
3285
3286 EV_FREQUENT_CHECK;
3287 }
3288
3289 void
3290 ev_stat_stop (EV_P_ ev_stat *w)
3291 {
3292 clear_pending (EV_A_ (W)w);
3293 if (expect_false (!ev_is_active (w)))
3294 return;
3295
3296 EV_FREQUENT_CHECK;
3297
3298 #if EV_USE_INOTIFY
3299 infy_del (EV_A_ w);
3300 #endif
3301
3302 if (ev_is_active (&w->timer))
3303 {
3304 ev_ref (EV_A);
3305 ev_timer_stop (EV_A_ &w->timer);
3306 }
3307
3308 ev_stop (EV_A_ (W)w);
3309
3310 EV_FREQUENT_CHECK;
3311 }
3312 #endif
3313
3314 #if EV_IDLE_ENABLE
3315 void
3316 ev_idle_start (EV_P_ ev_idle *w)
3317 {
3318 if (expect_false (ev_is_active (w)))
3319 return;
3320
3321 pri_adjust (EV_A_ (W)w);
3322
3323 EV_FREQUENT_CHECK;
3324
3325 {
3326 int active = ++idlecnt [ABSPRI (w)];
3327
3328 ++idleall;
3329 ev_start (EV_A_ (W)w, active);
3330
3331 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3332 idles [ABSPRI (w)][active - 1] = w;
3333 }
3334
3335 EV_FREQUENT_CHECK;
3336 }
3337
3338 void
3339 ev_idle_stop (EV_P_ ev_idle *w)
3340 {
3341 clear_pending (EV_A_ (W)w);
3342 if (expect_false (!ev_is_active (w)))
3343 return;
3344
3345 EV_FREQUENT_CHECK;
3346
3347 {
3348 int active = ev_active (w);
3349
3350 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3351 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3352
3353 ev_stop (EV_A_ (W)w);
3354 --idleall;
3355 }
3356
3357 EV_FREQUENT_CHECK;
3358 }
3359 #endif
3360
3361 #if EV_PREPARE_ENABLE
3362 void
3363 ev_prepare_start (EV_P_ ev_prepare *w)
3364 {
3365 if (expect_false (ev_is_active (w)))
3366 return;
3367
3368 EV_FREQUENT_CHECK;
3369
3370 ev_start (EV_A_ (W)w, ++preparecnt);
3371 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3372 prepares [preparecnt - 1] = w;
3373
3374 EV_FREQUENT_CHECK;
3375 }
3376
3377 void
3378 ev_prepare_stop (EV_P_ ev_prepare *w)
3379 {
3380 clear_pending (EV_A_ (W)w);
3381 if (expect_false (!ev_is_active (w)))
3382 return;
3383
3384 EV_FREQUENT_CHECK;
3385
3386 {
3387 int active = ev_active (w);
3388
3389 prepares [active - 1] = prepares [--preparecnt];
3390 ev_active (prepares [active - 1]) = active;
3391 }
3392
3393 ev_stop (EV_A_ (W)w);
3394
3395 EV_FREQUENT_CHECK;
3396 }
3397 #endif
3398
3399 #if EV_CHECK_ENABLE
3400 void
3401 ev_check_start (EV_P_ ev_check *w)
3402 {
3403 if (expect_false (ev_is_active (w)))
3404 return;
3405
3406 EV_FREQUENT_CHECK;
3407
3408 ev_start (EV_A_ (W)w, ++checkcnt);
3409 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3410 checks [checkcnt - 1] = w;
3411
3412 EV_FREQUENT_CHECK;
3413 }
3414
3415 void
3416 ev_check_stop (EV_P_ ev_check *w)
3417 {
3418 clear_pending (EV_A_ (W)w);
3419 if (expect_false (!ev_is_active (w)))
3420 return;
3421
3422 EV_FREQUENT_CHECK;
3423
3424 {
3425 int active = ev_active (w);
3426
3427 checks [active - 1] = checks [--checkcnt];
3428 ev_active (checks [active - 1]) = active;
3429 }
3430
3431 ev_stop (EV_A_ (W)w);
3432
3433 EV_FREQUENT_CHECK;
3434 }
3435 #endif
3436
3437 #if EV_EMBED_ENABLE
3438 void noinline
3439 ev_embed_sweep (EV_P_ ev_embed *w)
3440 {
3441 ev_run (w->other, EVRUN_NOWAIT);
3442 }
3443
3444 static void
3445 embed_io_cb (EV_P_ ev_io *io, int revents)
3446 {
3447 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3448
3449 if (ev_cb (w))
3450 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3451 else
3452 ev_run (w->other, EVRUN_NOWAIT);
3453 }
3454
3455 static void
3456 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3457 {
3458 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3459
3460 {
3461 EV_P = w->other;
3462
3463 while (fdchangecnt)
3464 {
3465 fd_reify (EV_A);
3466 ev_run (EV_A_ EVRUN_NOWAIT);
3467 }
3468 }
3469 }
3470
3471 static void
3472 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3473 {
3474 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3475
3476 ev_embed_stop (EV_A_ w);
3477
3478 {
3479 EV_P = w->other;
3480
3481 ev_loop_fork (EV_A);
3482 ev_run (EV_A_ EVRUN_NOWAIT);
3483 }
3484
3485 ev_embed_start (EV_A_ w);
3486 }
3487
3488 #if 0
3489 static void
3490 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3491 {
3492 ev_idle_stop (EV_A_ idle);
3493 }
3494 #endif
3495
3496 void
3497 ev_embed_start (EV_P_ ev_embed *w)
3498 {
3499 if (expect_false (ev_is_active (w)))
3500 return;
3501
3502 {
3503 EV_P = w->other;
3504 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3505 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3506 }
3507
3508 EV_FREQUENT_CHECK;
3509
3510 ev_set_priority (&w->io, ev_priority (w));
3511 ev_io_start (EV_A_ &w->io);
3512
3513 ev_prepare_init (&w->prepare, embed_prepare_cb);
3514 ev_set_priority (&w->prepare, EV_MINPRI);
3515 ev_prepare_start (EV_A_ &w->prepare);
3516
3517 ev_fork_init (&w->fork, embed_fork_cb);
3518 ev_fork_start (EV_A_ &w->fork);
3519
3520 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3521
3522 ev_start (EV_A_ (W)w, 1);
3523
3524 EV_FREQUENT_CHECK;
3525 }
3526
3527 void
3528 ev_embed_stop (EV_P_ ev_embed *w)
3529 {
3530 clear_pending (EV_A_ (W)w);
3531 if (expect_false (!ev_is_active (w)))
3532 return;
3533
3534 EV_FREQUENT_CHECK;
3535
3536 ev_io_stop (EV_A_ &w->io);
3537 ev_prepare_stop (EV_A_ &w->prepare);
3538 ev_fork_stop (EV_A_ &w->fork);
3539
3540 ev_stop (EV_A_ (W)w);
3541
3542 EV_FREQUENT_CHECK;
3543 }
3544 #endif
3545
3546 #if EV_FORK_ENABLE
3547 void
3548 ev_fork_start (EV_P_ ev_fork *w)
3549 {
3550 if (expect_false (ev_is_active (w)))
3551 return;
3552
3553 EV_FREQUENT_CHECK;
3554
3555 ev_start (EV_A_ (W)w, ++forkcnt);
3556 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3557 forks [forkcnt - 1] = w;
3558
3559 EV_FREQUENT_CHECK;
3560 }
3561
3562 void
3563 ev_fork_stop (EV_P_ ev_fork *w)
3564 {
3565 clear_pending (EV_A_ (W)w);
3566 if (expect_false (!ev_is_active (w)))
3567 return;
3568
3569 EV_FREQUENT_CHECK;
3570
3571 {
3572 int active = ev_active (w);
3573
3574 forks [active - 1] = forks [--forkcnt];
3575 ev_active (forks [active - 1]) = active;
3576 }
3577
3578 ev_stop (EV_A_ (W)w);
3579
3580 EV_FREQUENT_CHECK;
3581 }
3582 #endif
3583
3584 #if EV_CLEANUP_ENABLE
3585 void
3586 ev_cleanup_start (EV_P_ ev_cleanup *w)
3587 {
3588 if (expect_false (ev_is_active (w)))
3589 return;
3590
3591 EV_FREQUENT_CHECK;
3592
3593 ev_start (EV_A_ (W)w, ++cleanupcnt);
3594 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3595 cleanups [cleanupcnt - 1] = w;
3596
3597 /* cleanup watchers should never keep a refcount on the loop */
3598 ev_unref (EV_A);
3599 EV_FREQUENT_CHECK;
3600 }
3601
3602 void
3603 ev_cleanup_stop (EV_P_ ev_cleanup *w)
3604 {
3605 clear_pending (EV_A_ (W)w);
3606 if (expect_false (!ev_is_active (w)))
3607 return;
3608
3609 EV_FREQUENT_CHECK;
3610 ev_ref (EV_A);
3611
3612 {
3613 int active = ev_active (w);
3614
3615 cleanups [active - 1] = cleanups [--cleanupcnt];
3616 ev_active (cleanups [active - 1]) = active;
3617 }
3618
3619 ev_stop (EV_A_ (W)w);
3620
3621 EV_FREQUENT_CHECK;
3622 }
3623 #endif
3624
3625 #if EV_ASYNC_ENABLE
3626 void
3627 ev_async_start (EV_P_ ev_async *w)
3628 {
3629 if (expect_false (ev_is_active (w)))
3630 return;
3631
3632 w->sent = 0;
3633
3634 evpipe_init (EV_A);
3635
3636 EV_FREQUENT_CHECK;
3637
3638 ev_start (EV_A_ (W)w, ++asynccnt);
3639 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3640 asyncs [asynccnt - 1] = w;
3641
3642 EV_FREQUENT_CHECK;
3643 }
3644
3645 void
3646 ev_async_stop (EV_P_ ev_async *w)
3647 {
3648 clear_pending (EV_A_ (W)w);
3649 if (expect_false (!ev_is_active (w)))
3650 return;
3651
3652 EV_FREQUENT_CHECK;
3653
3654 {
3655 int active = ev_active (w);
3656
3657 asyncs [active - 1] = asyncs [--asynccnt];
3658 ev_active (asyncs [active - 1]) = active;
3659 }
3660
3661 ev_stop (EV_A_ (W)w);
3662
3663 EV_FREQUENT_CHECK;
3664 }
3665
3666 void
3667 ev_async_send (EV_P_ ev_async *w)
3668 {
3669 w->sent = 1;
3670 evpipe_write (EV_A_ &async_pending);
3671 }
3672 #endif
3673
3674 /*****************************************************************************/
3675
3676 struct ev_once
3677 {
3678 ev_io io;
3679 ev_timer to;
3680 void (*cb)(int revents, void *arg);
3681 void *arg;
3682 };
3683
3684 static void
3685 once_cb (EV_P_ struct ev_once *once, int revents)
3686 {
3687 void (*cb)(int revents, void *arg) = once->cb;
3688 void *arg = once->arg;
3689
3690 ev_io_stop (EV_A_ &once->io);
3691 ev_timer_stop (EV_A_ &once->to);
3692 ev_free (once);
3693
3694 cb (revents, arg);
3695 }
3696
3697 static void
3698 once_cb_io (EV_P_ ev_io *w, int revents)
3699 {
3700 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3701
3702 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3703 }
3704
3705 static void
3706 once_cb_to (EV_P_ ev_timer *w, int revents)
3707 {
3708 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3709
3710 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3711 }
3712
3713 void
3714 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3715 {
3716 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3717
3718 if (expect_false (!once))
3719 {
3720 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3721 return;
3722 }
3723
3724 once->cb = cb;
3725 once->arg = arg;
3726
3727 ev_init (&once->io, once_cb_io);
3728 if (fd >= 0)
3729 {
3730 ev_io_set (&once->io, fd, events);
3731 ev_io_start (EV_A_ &once->io);
3732 }
3733
3734 ev_init (&once->to, once_cb_to);
3735 if (timeout >= 0.)
3736 {
3737 ev_timer_set (&once->to, timeout, 0.);
3738 ev_timer_start (EV_A_ &once->to);
3739 }
3740 }
3741
3742 /*****************************************************************************/
3743
3744 #if EV_WALK_ENABLE
3745 void
3746 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3747 {
3748 int i, j;
3749 ev_watcher_list *wl, *wn;
3750
3751 if (types & (EV_IO | EV_EMBED))
3752 for (i = 0; i < anfdmax; ++i)
3753 for (wl = anfds [i].head; wl; )
3754 {
3755 wn = wl->next;
3756
3757 #if EV_EMBED_ENABLE
3758 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3759 {
3760 if (types & EV_EMBED)
3761 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3762 }
3763 else
3764 #endif
3765 #if EV_USE_INOTIFY
3766 if (ev_cb ((ev_io *)wl) == infy_cb)
3767 ;
3768 else
3769 #endif
3770 if ((ev_io *)wl != &pipe_w)
3771 if (types & EV_IO)
3772 cb (EV_A_ EV_IO, wl);
3773
3774 wl = wn;
3775 }
3776
3777 if (types & (EV_TIMER | EV_STAT))
3778 for (i = timercnt + HEAP0; i-- > HEAP0; )
3779 #if EV_STAT_ENABLE
3780 /*TODO: timer is not always active*/
3781 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3782 {
3783 if (types & EV_STAT)
3784 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3785 }
3786 else
3787 #endif
3788 if (types & EV_TIMER)
3789 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3790
3791 #if EV_PERIODIC_ENABLE
3792 if (types & EV_PERIODIC)
3793 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3794 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3795 #endif
3796
3797 #if EV_IDLE_ENABLE
3798 if (types & EV_IDLE)
3799 for (j = NUMPRI; i--; )
3800 for (i = idlecnt [j]; i--; )
3801 cb (EV_A_ EV_IDLE, idles [j][i]);
3802 #endif
3803
3804 #if EV_FORK_ENABLE
3805 if (types & EV_FORK)
3806 for (i = forkcnt; i--; )
3807 if (ev_cb (forks [i]) != embed_fork_cb)
3808 cb (EV_A_ EV_FORK, forks [i]);
3809 #endif
3810
3811 #if EV_ASYNC_ENABLE
3812 if (types & EV_ASYNC)
3813 for (i = asynccnt; i--; )
3814 cb (EV_A_ EV_ASYNC, asyncs [i]);
3815 #endif
3816
3817 #if EV_PREPARE_ENABLE
3818 if (types & EV_PREPARE)
3819 for (i = preparecnt; i--; )
3820 # if EV_EMBED_ENABLE
3821 if (ev_cb (prepares [i]) != embed_prepare_cb)
3822 # endif
3823 cb (EV_A_ EV_PREPARE, prepares [i]);
3824 #endif
3825
3826 #if EV_CHECK_ENABLE
3827 if (types & EV_CHECK)
3828 for (i = checkcnt; i--; )
3829 cb (EV_A_ EV_CHECK, checks [i]);
3830 #endif
3831
3832 #if EV_SIGNAL_ENABLE
3833 if (types & EV_SIGNAL)
3834 for (i = 0; i < EV_NSIG - 1; ++i)
3835 for (wl = signals [i].head; wl; )
3836 {
3837 wn = wl->next;
3838 cb (EV_A_ EV_SIGNAL, wl);
3839 wl = wn;
3840 }
3841 #endif
3842
3843 #if EV_CHILD_ENABLE
3844 if (types & EV_CHILD)
3845 for (i = (EV_PID_HASHSIZE); i--; )
3846 for (wl = childs [i]; wl; )
3847 {
3848 wn = wl->next;
3849 cb (EV_A_ EV_CHILD, wl);
3850 wl = wn;
3851 }
3852 #endif
3853 /* EV_STAT 0x00001000 /* stat data changed */
3854 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
3855 }
3856 #endif
3857
3858 #if EV_MULTIPLICITY
3859 #include "ev_wrap.h"
3860 #endif
3861
3862 EV_CPP(})
3863