ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev.c
Revision: 1.397
Committed: Wed Aug 24 16:13:41 2011 UTC (12 years, 10 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.396: +1 -1 lines
Log Message:
*** empty log message ***

File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 /* this big block deduces configuration from config.h */
41 #ifndef EV_STANDALONE
42 # ifdef EV_CONFIG_H
43 # include EV_CONFIG_H
44 # else
45 # include "config.h"
46 # endif
47
48 #if HAVE_FLOOR
49 # ifndef EV_USE_FLOOR
50 # define EV_USE_FLOOR 1
51 # endif
52 #endif
53
54 # if HAVE_CLOCK_SYSCALL
55 # ifndef EV_USE_CLOCK_SYSCALL
56 # define EV_USE_CLOCK_SYSCALL 1
57 # ifndef EV_USE_REALTIME
58 # define EV_USE_REALTIME 0
59 # endif
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 1
62 # endif
63 # endif
64 # elif !defined(EV_USE_CLOCK_SYSCALL)
65 # define EV_USE_CLOCK_SYSCALL 0
66 # endif
67
68 # if HAVE_CLOCK_GETTIME
69 # ifndef EV_USE_MONOTONIC
70 # define EV_USE_MONOTONIC 1
71 # endif
72 # ifndef EV_USE_REALTIME
73 # define EV_USE_REALTIME 0
74 # endif
75 # else
76 # ifndef EV_USE_MONOTONIC
77 # define EV_USE_MONOTONIC 0
78 # endif
79 # ifndef EV_USE_REALTIME
80 # define EV_USE_REALTIME 0
81 # endif
82 # endif
83
84 # if HAVE_NANOSLEEP
85 # ifndef EV_USE_NANOSLEEP
86 # define EV_USE_NANOSLEEP EV_FEATURE_OS
87 # endif
88 # else
89 # undef EV_USE_NANOSLEEP
90 # define EV_USE_NANOSLEEP 0
91 # endif
92
93 # if HAVE_SELECT && HAVE_SYS_SELECT_H
94 # ifndef EV_USE_SELECT
95 # define EV_USE_SELECT EV_FEATURE_BACKENDS
96 # endif
97 # else
98 # undef EV_USE_SELECT
99 # define EV_USE_SELECT 0
100 # endif
101
102 # if HAVE_POLL && HAVE_POLL_H
103 # ifndef EV_USE_POLL
104 # define EV_USE_POLL EV_FEATURE_BACKENDS
105 # endif
106 # else
107 # undef EV_USE_POLL
108 # define EV_USE_POLL 0
109 # endif
110
111 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
112 # ifndef EV_USE_EPOLL
113 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
114 # endif
115 # else
116 # undef EV_USE_EPOLL
117 # define EV_USE_EPOLL 0
118 # endif
119
120 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
121 # ifndef EV_USE_KQUEUE
122 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
123 # endif
124 # else
125 # undef EV_USE_KQUEUE
126 # define EV_USE_KQUEUE 0
127 # endif
128
129 # if HAVE_PORT_H && HAVE_PORT_CREATE
130 # ifndef EV_USE_PORT
131 # define EV_USE_PORT EV_FEATURE_BACKENDS
132 # endif
133 # else
134 # undef EV_USE_PORT
135 # define EV_USE_PORT 0
136 # endif
137
138 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
139 # ifndef EV_USE_INOTIFY
140 # define EV_USE_INOTIFY EV_FEATURE_OS
141 # endif
142 # else
143 # undef EV_USE_INOTIFY
144 # define EV_USE_INOTIFY 0
145 # endif
146
147 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
148 # ifndef EV_USE_SIGNALFD
149 # define EV_USE_SIGNALFD EV_FEATURE_OS
150 # endif
151 # else
152 # undef EV_USE_SIGNALFD
153 # define EV_USE_SIGNALFD 0
154 # endif
155
156 # if HAVE_EVENTFD
157 # ifndef EV_USE_EVENTFD
158 # define EV_USE_EVENTFD EV_FEATURE_OS
159 # endif
160 # else
161 # undef EV_USE_EVENTFD
162 # define EV_USE_EVENTFD 0
163 # endif
164
165 #endif
166
167 #include <stdlib.h>
168 #include <string.h>
169 #include <fcntl.h>
170 #include <stddef.h>
171
172 #include <stdio.h>
173
174 #include <assert.h>
175 #include <errno.h>
176 #include <sys/types.h>
177 #include <time.h>
178 #include <limits.h>
179
180 #include <signal.h>
181
182 #ifdef EV_H
183 # include EV_H
184 #else
185 # include "ev.h"
186 #endif
187
188 EV_CPP(extern "C" {)
189
190 #ifndef _WIN32
191 # include <sys/time.h>
192 # include <sys/wait.h>
193 # include <unistd.h>
194 #else
195 # include <io.h>
196 # define WIN32_LEAN_AND_MEAN
197 # include <windows.h>
198 # ifndef EV_SELECT_IS_WINSOCKET
199 # define EV_SELECT_IS_WINSOCKET 1
200 # endif
201 # undef EV_AVOID_STDIO
202 #endif
203
204 /* OS X, in its infinite idiocy, actually HARDCODES
205 * a limit of 1024 into their select. Where people have brains,
206 * OS X engineers apparently have a vacuum. Or maybe they were
207 * ordered to have a vacuum, or they do anything for money.
208 * This might help. Or not.
209 */
210 #define _DARWIN_UNLIMITED_SELECT 1
211
212 /* this block tries to deduce configuration from header-defined symbols and defaults */
213
214 /* try to deduce the maximum number of signals on this platform */
215 #if defined (EV_NSIG)
216 /* use what's provided */
217 #elif defined (NSIG)
218 # define EV_NSIG (NSIG)
219 #elif defined(_NSIG)
220 # define EV_NSIG (_NSIG)
221 #elif defined (SIGMAX)
222 # define EV_NSIG (SIGMAX+1)
223 #elif defined (SIG_MAX)
224 # define EV_NSIG (SIG_MAX+1)
225 #elif defined (_SIG_MAX)
226 # define EV_NSIG (_SIG_MAX+1)
227 #elif defined (MAXSIG)
228 # define EV_NSIG (MAXSIG+1)
229 #elif defined (MAX_SIG)
230 # define EV_NSIG (MAX_SIG+1)
231 #elif defined (SIGARRAYSIZE)
232 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
233 #elif defined (_sys_nsig)
234 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
235 #else
236 # error "unable to find value for NSIG, please report"
237 /* to make it compile regardless, just remove the above line, */
238 /* but consider reporting it, too! :) */
239 # define EV_NSIG 65
240 #endif
241
242 #ifndef EV_USE_FLOOR
243 # define EV_USE_FLOOR 0
244 #endif
245
246 #ifndef EV_USE_CLOCK_SYSCALL
247 # if __linux && __GLIBC__ >= 2
248 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
249 # else
250 # define EV_USE_CLOCK_SYSCALL 0
251 # endif
252 #endif
253
254 #ifndef EV_USE_MONOTONIC
255 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
256 # define EV_USE_MONOTONIC EV_FEATURE_OS
257 # else
258 # define EV_USE_MONOTONIC 0
259 # endif
260 #endif
261
262 #ifndef EV_USE_REALTIME
263 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
264 #endif
265
266 #ifndef EV_USE_NANOSLEEP
267 # if _POSIX_C_SOURCE >= 199309L
268 # define EV_USE_NANOSLEEP EV_FEATURE_OS
269 # else
270 # define EV_USE_NANOSLEEP 0
271 # endif
272 #endif
273
274 #ifndef EV_USE_SELECT
275 # define EV_USE_SELECT EV_FEATURE_BACKENDS
276 #endif
277
278 #ifndef EV_USE_POLL
279 # ifdef _WIN32
280 # define EV_USE_POLL 0
281 # else
282 # define EV_USE_POLL EV_FEATURE_BACKENDS
283 # endif
284 #endif
285
286 #ifndef EV_USE_EPOLL
287 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
288 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
289 # else
290 # define EV_USE_EPOLL 0
291 # endif
292 #endif
293
294 #ifndef EV_USE_KQUEUE
295 # define EV_USE_KQUEUE 0
296 #endif
297
298 #ifndef EV_USE_PORT
299 # define EV_USE_PORT 0
300 #endif
301
302 #ifndef EV_USE_INOTIFY
303 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
304 # define EV_USE_INOTIFY EV_FEATURE_OS
305 # else
306 # define EV_USE_INOTIFY 0
307 # endif
308 #endif
309
310 #ifndef EV_PID_HASHSIZE
311 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
312 #endif
313
314 #ifndef EV_INOTIFY_HASHSIZE
315 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
316 #endif
317
318 #ifndef EV_USE_EVENTFD
319 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
320 # define EV_USE_EVENTFD EV_FEATURE_OS
321 # else
322 # define EV_USE_EVENTFD 0
323 # endif
324 #endif
325
326 #ifndef EV_USE_SIGNALFD
327 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
328 # define EV_USE_SIGNALFD EV_FEATURE_OS
329 # else
330 # define EV_USE_SIGNALFD 0
331 # endif
332 #endif
333
334 #if 0 /* debugging */
335 # define EV_VERIFY 3
336 # define EV_USE_4HEAP 1
337 # define EV_HEAP_CACHE_AT 1
338 #endif
339
340 #ifndef EV_VERIFY
341 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
342 #endif
343
344 #ifndef EV_USE_4HEAP
345 # define EV_USE_4HEAP EV_FEATURE_DATA
346 #endif
347
348 #ifndef EV_HEAP_CACHE_AT
349 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
350 #endif
351
352 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
353 /* which makes programs even slower. might work on other unices, too. */
354 #if EV_USE_CLOCK_SYSCALL
355 # include <syscall.h>
356 # ifdef SYS_clock_gettime
357 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
358 # undef EV_USE_MONOTONIC
359 # define EV_USE_MONOTONIC 1
360 # else
361 # undef EV_USE_CLOCK_SYSCALL
362 # define EV_USE_CLOCK_SYSCALL 0
363 # endif
364 #endif
365
366 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
367
368 #ifdef _AIX
369 /* AIX has a completely broken poll.h header */
370 # undef EV_USE_POLL
371 # define EV_USE_POLL 0
372 #endif
373
374 #ifndef CLOCK_MONOTONIC
375 # undef EV_USE_MONOTONIC
376 # define EV_USE_MONOTONIC 0
377 #endif
378
379 #ifndef CLOCK_REALTIME
380 # undef EV_USE_REALTIME
381 # define EV_USE_REALTIME 0
382 #endif
383
384 #if !EV_STAT_ENABLE
385 # undef EV_USE_INOTIFY
386 # define EV_USE_INOTIFY 0
387 #endif
388
389 #if !EV_USE_NANOSLEEP
390 /* hp-ux has it in sys/time.h, which we unconditionally include above */
391 # if !defined(_WIN32) && !defined(__hpux)
392 # include <sys/select.h>
393 # endif
394 #endif
395
396 #if EV_USE_INOTIFY
397 # include <sys/statfs.h>
398 # include <sys/inotify.h>
399 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
400 # ifndef IN_DONT_FOLLOW
401 # undef EV_USE_INOTIFY
402 # define EV_USE_INOTIFY 0
403 # endif
404 #endif
405
406 #if EV_SELECT_IS_WINSOCKET
407 # include <winsock.h>
408 #endif
409
410 #if EV_USE_EVENTFD
411 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
412 # include <stdint.h>
413 # ifndef EFD_NONBLOCK
414 # define EFD_NONBLOCK O_NONBLOCK
415 # endif
416 # ifndef EFD_CLOEXEC
417 # ifdef O_CLOEXEC
418 # define EFD_CLOEXEC O_CLOEXEC
419 # else
420 # define EFD_CLOEXEC 02000000
421 # endif
422 # endif
423 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
424 #endif
425
426 #if EV_USE_SIGNALFD
427 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
428 # include <stdint.h>
429 # ifndef SFD_NONBLOCK
430 # define SFD_NONBLOCK O_NONBLOCK
431 # endif
432 # ifndef SFD_CLOEXEC
433 # ifdef O_CLOEXEC
434 # define SFD_CLOEXEC O_CLOEXEC
435 # else
436 # define SFD_CLOEXEC 02000000
437 # endif
438 # endif
439 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
440
441 struct signalfd_siginfo
442 {
443 uint32_t ssi_signo;
444 char pad[128 - sizeof (uint32_t)];
445 };
446 #endif
447
448 /**/
449
450 #if EV_VERIFY >= 3
451 # define EV_FREQUENT_CHECK ev_verify (EV_A)
452 #else
453 # define EV_FREQUENT_CHECK do { } while (0)
454 #endif
455
456 /*
457 * This is used to work around floating point rounding problems.
458 * This value is good at least till the year 4000.
459 */
460 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
461 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
462
463 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
464 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
465
466 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
467 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
468
469 /* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
470 /* ECB.H BEGIN */
471 /*
472 * libecb - http://software.schmorp.de/pkg/libecb
473 *
474 * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de>
475 * Copyright (©) 2011 Emanuele Giaquinta
476 * All rights reserved.
477 *
478 * Redistribution and use in source and binary forms, with or without modifica-
479 * tion, are permitted provided that the following conditions are met:
480 *
481 * 1. Redistributions of source code must retain the above copyright notice,
482 * this list of conditions and the following disclaimer.
483 *
484 * 2. Redistributions in binary form must reproduce the above copyright
485 * notice, this list of conditions and the following disclaimer in the
486 * documentation and/or other materials provided with the distribution.
487 *
488 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
489 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
490 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
491 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
492 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
493 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
494 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
495 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
496 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
497 * OF THE POSSIBILITY OF SUCH DAMAGE.
498 */
499
500 #ifndef ECB_H
501 #define ECB_H
502
503 #ifdef _WIN32
504 typedef signed char int8_t;
505 typedef unsigned char uint8_t;
506 typedef signed short int16_t;
507 typedef unsigned short uint16_t;
508 typedef signed int int32_t;
509 typedef unsigned int uint32_t;
510 #if __GNUC__
511 typedef signed long long int64_t;
512 typedef unsigned long long uint64_t;
513 #else /* _MSC_VER || __BORLANDC__ */
514 typedef signed __int64 int64_t;
515 typedef unsigned __int64 uint64_t;
516 #endif
517 #else
518 #include <inttypes.h>
519 #endif
520
521 /* many compilers define _GNUC_ to some versions but then only implement
522 * what their idiot authors think are the "more important" extensions,
523 * causing enormous grief in return for some better fake benchmark numbers.
524 * or so.
525 * we try to detect these and simply assume they are not gcc - if they have
526 * an issue with that they should have done it right in the first place.
527 */
528 #ifndef ECB_GCC_VERSION
529 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
530 #define ECB_GCC_VERSION(major,minor) 0
531 #else
532 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
533 #endif
534 #endif
535
536 /*****************************************************************************/
537
538 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
539 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
540
541 #if ECB_NO_THREADS || ECB_NO_SMP
542 #define ECB_MEMORY_FENCE do { } while (0)
543 #endif
544
545 #ifndef ECB_MEMORY_FENCE
546 #if ECB_GCC_VERSION(2,5)
547 #if __i386__
548 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
549 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
550 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
551 #elif __amd64
552 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
553 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
554 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
555 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
556 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
557 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
558 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
559 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
560 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
561 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
562 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
563 #endif
564 #endif
565 #endif
566
567 #ifndef ECB_MEMORY_FENCE
568 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER)
569 #define ECB_MEMORY_FENCE __sync_synchronize ()
570 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
571 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
572 #elif _MSC_VER >= 1400 /* VC++ 2005 */
573 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
574 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
575 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
576 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
577 #elif defined(_WIN32)
578 #include <WinNT.h>
579 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
580 #endif
581 #endif
582
583 #ifndef ECB_MEMORY_FENCE
584 #if !ECB_AVOID_PTHREADS
585 /*
586 * if you get undefined symbol references to pthread_mutex_lock,
587 * or failure to find pthread.h, then you should implement
588 * the ECB_MEMORY_FENCE operations for your cpu/compiler
589 * OR provide pthread.h and link against the posix thread library
590 * of your system.
591 */
592 #include <pthread.h>
593 #define ECB_NEEDS_PTHREADS 1
594 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
595
596 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
597 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
598 #endif
599 #endif
600
601 #if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
602 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
603 #endif
604
605 #if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
606 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
607 #endif
608
609 /*****************************************************************************/
610
611 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
612
613 #if __cplusplus
614 #define ecb_inline static inline
615 #elif ECB_GCC_VERSION(2,5)
616 #define ecb_inline static __inline__
617 #elif ECB_C99
618 #define ecb_inline static inline
619 #else
620 #define ecb_inline static
621 #endif
622
623 #if ECB_GCC_VERSION(3,3)
624 #define ecb_restrict __restrict__
625 #elif ECB_C99
626 #define ecb_restrict restrict
627 #else
628 #define ecb_restrict
629 #endif
630
631 typedef int ecb_bool;
632
633 #define ECB_CONCAT_(a, b) a ## b
634 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
635 #define ECB_STRINGIFY_(a) # a
636 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
637
638 #define ecb_function_ ecb_inline
639
640 #if ECB_GCC_VERSION(3,1)
641 #define ecb_attribute(attrlist) __attribute__(attrlist)
642 #define ecb_is_constant(expr) __builtin_constant_p (expr)
643 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
644 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
645 #else
646 #define ecb_attribute(attrlist)
647 #define ecb_is_constant(expr) 0
648 #define ecb_expect(expr,value) (expr)
649 #define ecb_prefetch(addr,rw,locality)
650 #endif
651
652 /* no emulation for ecb_decltype */
653 #if ECB_GCC_VERSION(4,5)
654 #define ecb_decltype(x) __decltype(x)
655 #elif ECB_GCC_VERSION(3,0)
656 #define ecb_decltype(x) __typeof(x)
657 #endif
658
659 #define ecb_noinline ecb_attribute ((__noinline__))
660 #define ecb_noreturn ecb_attribute ((__noreturn__))
661 #define ecb_unused ecb_attribute ((__unused__))
662 #define ecb_const ecb_attribute ((__const__))
663 #define ecb_pure ecb_attribute ((__pure__))
664
665 #if ECB_GCC_VERSION(4,3)
666 #define ecb_artificial ecb_attribute ((__artificial__))
667 #define ecb_hot ecb_attribute ((__hot__))
668 #define ecb_cold ecb_attribute ((__cold__))
669 #else
670 #define ecb_artificial
671 #define ecb_hot
672 #define ecb_cold
673 #endif
674
675 /* put around conditional expressions if you are very sure that the */
676 /* expression is mostly true or mostly false. note that these return */
677 /* booleans, not the expression. */
678 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
679 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
680 /* for compatibility to the rest of the world */
681 #define ecb_likely(expr) ecb_expect_true (expr)
682 #define ecb_unlikely(expr) ecb_expect_false (expr)
683
684 /* count trailing zero bits and count # of one bits */
685 #if ECB_GCC_VERSION(3,4)
686 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
687 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
688 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
689 #define ecb_ctz32(x) __builtin_ctz (x)
690 #define ecb_ctz64(x) __builtin_ctzll (x)
691 #define ecb_popcount32(x) __builtin_popcount (x)
692 /* no popcountll */
693 #else
694 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
695 ecb_function_ int
696 ecb_ctz32 (uint32_t x)
697 {
698 int r = 0;
699
700 x &= ~x + 1; /* this isolates the lowest bit */
701
702 #if ECB_branchless_on_i386
703 r += !!(x & 0xaaaaaaaa) << 0;
704 r += !!(x & 0xcccccccc) << 1;
705 r += !!(x & 0xf0f0f0f0) << 2;
706 r += !!(x & 0xff00ff00) << 3;
707 r += !!(x & 0xffff0000) << 4;
708 #else
709 if (x & 0xaaaaaaaa) r += 1;
710 if (x & 0xcccccccc) r += 2;
711 if (x & 0xf0f0f0f0) r += 4;
712 if (x & 0xff00ff00) r += 8;
713 if (x & 0xffff0000) r += 16;
714 #endif
715
716 return r;
717 }
718
719 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
720 ecb_function_ int
721 ecb_ctz64 (uint64_t x)
722 {
723 int shift = x & 0xffffffffU ? 0 : 32;
724 return ecb_ctz32 (x >> shift) + shift;
725 }
726
727 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
728 ecb_function_ int
729 ecb_popcount32 (uint32_t x)
730 {
731 x -= (x >> 1) & 0x55555555;
732 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
733 x = ((x >> 4) + x) & 0x0f0f0f0f;
734 x *= 0x01010101;
735
736 return x >> 24;
737 }
738
739 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
740 ecb_function_ int ecb_ld32 (uint32_t x)
741 {
742 int r = 0;
743
744 if (x >> 16) { x >>= 16; r += 16; }
745 if (x >> 8) { x >>= 8; r += 8; }
746 if (x >> 4) { x >>= 4; r += 4; }
747 if (x >> 2) { x >>= 2; r += 2; }
748 if (x >> 1) { r += 1; }
749
750 return r;
751 }
752
753 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
754 ecb_function_ int ecb_ld64 (uint64_t x)
755 {
756 int r = 0;
757
758 if (x >> 32) { x >>= 32; r += 32; }
759
760 return r + ecb_ld32 (x);
761 }
762 #endif
763
764 /* popcount64 is only available on 64 bit cpus as gcc builtin */
765 /* so for this version we are lazy */
766 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
767 ecb_function_ int
768 ecb_popcount64 (uint64_t x)
769 {
770 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
771 }
772
773 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
774 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
775 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
776 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
777 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
778 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
779 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
780 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
781
782 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
783 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
784 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
785 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
786 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
787 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
788 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
789 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
790
791 #if ECB_GCC_VERSION(4,3)
792 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
793 #define ecb_bswap32(x) __builtin_bswap32 (x)
794 #define ecb_bswap64(x) __builtin_bswap64 (x)
795 #else
796 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
797 ecb_function_ uint16_t
798 ecb_bswap16 (uint16_t x)
799 {
800 return ecb_rotl16 (x, 8);
801 }
802
803 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
804 ecb_function_ uint32_t
805 ecb_bswap32 (uint32_t x)
806 {
807 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
808 }
809
810 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
811 ecb_function_ uint64_t
812 ecb_bswap64 (uint64_t x)
813 {
814 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
815 }
816 #endif
817
818 #if ECB_GCC_VERSION(4,5)
819 #define ecb_unreachable() __builtin_unreachable ()
820 #else
821 /* this seems to work fine, but gcc always emits a warning for it :/ */
822 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
823 ecb_function_ void ecb_unreachable (void) { }
824 #endif
825
826 /* try to tell the compiler that some condition is definitely true */
827 #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
828
829 ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
830 ecb_function_ unsigned char
831 ecb_byteorder_helper (void)
832 {
833 const uint32_t u = 0x11223344;
834 return *(unsigned char *)&u;
835 }
836
837 ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
838 ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
839 ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
840 ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
841
842 #if ECB_GCC_VERSION(3,0) || ECB_C99
843 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
844 #else
845 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
846 #endif
847
848 #if ecb_cplusplus_does_not_suck
849 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
850 template<typename T, int N>
851 static inline int ecb_array_length (const T (&arr)[N])
852 {
853 return N;
854 }
855 #else
856 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
857 #endif
858
859 #endif
860
861 /* ECB.H END */
862
863 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
864 /* if your architecture doesn't need memory fences, e.g. because it is
865 * single-cpu/core, or if you use libev in a project that doesn't use libev
866 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
867 * libev, in which casess the memory fences become nops.
868 * alternatively, you can remove this #error and link against libpthread,
869 * which will then provide the memory fences.
870 */
871 # error "memory fences not defined for your architecture, please report"
872 #endif
873
874 #ifndef ECB_MEMORY_FENCE
875 # define ECB_MEMORY_FENCE do { } while (0)
876 # define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
877 # define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
878 #endif
879
880 #define expect_false(cond) ecb_expect_false (cond)
881 #define expect_true(cond) ecb_expect_true (cond)
882 #define noinline ecb_noinline
883
884 #define inline_size ecb_inline
885
886 #if EV_FEATURE_CODE
887 # define inline_speed ecb_inline
888 #else
889 # define inline_speed static noinline
890 #endif
891
892 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
893
894 #if EV_MINPRI == EV_MAXPRI
895 # define ABSPRI(w) (((W)w), 0)
896 #else
897 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
898 #endif
899
900 #define EMPTY /* required for microsofts broken pseudo-c compiler */
901 #define EMPTY2(a,b) /* used to suppress some warnings */
902
903 typedef ev_watcher *W;
904 typedef ev_watcher_list *WL;
905 typedef ev_watcher_time *WT;
906
907 #define ev_active(w) ((W)(w))->active
908 #define ev_at(w) ((WT)(w))->at
909
910 #if EV_USE_REALTIME
911 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
912 /* giving it a reasonably high chance of working on typical architectures */
913 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
914 #endif
915
916 #if EV_USE_MONOTONIC
917 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
918 #endif
919
920 #ifndef EV_FD_TO_WIN32_HANDLE
921 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
922 #endif
923 #ifndef EV_WIN32_HANDLE_TO_FD
924 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
925 #endif
926 #ifndef EV_WIN32_CLOSE_FD
927 # define EV_WIN32_CLOSE_FD(fd) close (fd)
928 #endif
929
930 #ifdef _WIN32
931 # include "ev_win32.c"
932 #endif
933
934 /*****************************************************************************/
935
936 /* define a suitable floor function (only used by periodics atm) */
937
938 #if EV_USE_FLOOR
939 # include <math.h>
940 # define ev_floor(v) floor (v)
941 #else
942
943 #include <float.h>
944
945 /* a floor() replacement function, should be independent of ev_tstamp type */
946 static ev_tstamp noinline
947 ev_floor (ev_tstamp v)
948 {
949 /* the choice of shift factor is not terribly important */
950 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
951 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
952 #else
953 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
954 #endif
955
956 /* argument too large for an unsigned long? */
957 if (expect_false (v >= shift))
958 {
959 ev_tstamp f;
960
961 if (v == v - 1.)
962 return v; /* very large number */
963
964 f = shift * ev_floor (v * (1. / shift));
965 return f + ev_floor (v - f);
966 }
967
968 /* special treatment for negative args? */
969 if (expect_false (v < 0.))
970 {
971 ev_tstamp f = -ev_floor (-v);
972
973 return f - (f == v ? 0 : 1);
974 }
975
976 /* fits into an unsigned long */
977 return (unsigned long)v;
978 }
979
980 #endif
981
982 /*****************************************************************************/
983
984 #ifdef __linux
985 # include <sys/utsname.h>
986 #endif
987
988 static unsigned int noinline ecb_cold
989 ev_linux_version (void)
990 {
991 #ifdef __linux
992 unsigned int v = 0;
993 struct utsname buf;
994 int i;
995 char *p = buf.release;
996
997 if (uname (&buf))
998 return 0;
999
1000 for (i = 3+1; --i; )
1001 {
1002 unsigned int c = 0;
1003
1004 for (;;)
1005 {
1006 if (*p >= '0' && *p <= '9')
1007 c = c * 10 + *p++ - '0';
1008 else
1009 {
1010 p += *p == '.';
1011 break;
1012 }
1013 }
1014
1015 v = (v << 8) | c;
1016 }
1017
1018 return v;
1019 #else
1020 return 0;
1021 #endif
1022 }
1023
1024 /*****************************************************************************/
1025
1026 #if EV_AVOID_STDIO
1027 static void noinline ecb_cold
1028 ev_printerr (const char *msg)
1029 {
1030 write (STDERR_FILENO, msg, strlen (msg));
1031 }
1032 #endif
1033
1034 static void (*syserr_cb)(const char *msg);
1035
1036 void ecb_cold
1037 ev_set_syserr_cb (void (*cb)(const char *msg))
1038 {
1039 syserr_cb = cb;
1040 }
1041
1042 static void noinline ecb_cold
1043 ev_syserr (const char *msg)
1044 {
1045 if (!msg)
1046 msg = "(libev) system error";
1047
1048 if (syserr_cb)
1049 syserr_cb (msg);
1050 else
1051 {
1052 #if EV_AVOID_STDIO
1053 ev_printerr (msg);
1054 ev_printerr (": ");
1055 ev_printerr (strerror (errno));
1056 ev_printerr ("\n");
1057 #else
1058 perror (msg);
1059 #endif
1060 abort ();
1061 }
1062 }
1063
1064 static void *
1065 ev_realloc_emul (void *ptr, long size)
1066 {
1067 #if __GLIBC__
1068 return realloc (ptr, size);
1069 #else
1070 /* some systems, notably openbsd and darwin, fail to properly
1071 * implement realloc (x, 0) (as required by both ansi c-89 and
1072 * the single unix specification, so work around them here.
1073 */
1074
1075 if (size)
1076 return realloc (ptr, size);
1077
1078 free (ptr);
1079 return 0;
1080 #endif
1081 }
1082
1083 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
1084
1085 void ecb_cold
1086 ev_set_allocator (void *(*cb)(void *ptr, long size))
1087 {
1088 alloc = cb;
1089 }
1090
1091 inline_speed void *
1092 ev_realloc (void *ptr, long size)
1093 {
1094 ptr = alloc (ptr, size);
1095
1096 if (!ptr && size)
1097 {
1098 #if EV_AVOID_STDIO
1099 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1100 #else
1101 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1102 #endif
1103 abort ();
1104 }
1105
1106 return ptr;
1107 }
1108
1109 #define ev_malloc(size) ev_realloc (0, (size))
1110 #define ev_free(ptr) ev_realloc ((ptr), 0)
1111
1112 /*****************************************************************************/
1113
1114 /* set in reify when reification needed */
1115 #define EV_ANFD_REIFY 1
1116
1117 /* file descriptor info structure */
1118 typedef struct
1119 {
1120 WL head;
1121 unsigned char events; /* the events watched for */
1122 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1123 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1124 unsigned char unused;
1125 #if EV_USE_EPOLL
1126 unsigned int egen; /* generation counter to counter epoll bugs */
1127 #endif
1128 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1129 SOCKET handle;
1130 #endif
1131 #if EV_USE_IOCP
1132 OVERLAPPED or, ow;
1133 #endif
1134 } ANFD;
1135
1136 /* stores the pending event set for a given watcher */
1137 typedef struct
1138 {
1139 W w;
1140 int events; /* the pending event set for the given watcher */
1141 } ANPENDING;
1142
1143 #if EV_USE_INOTIFY
1144 /* hash table entry per inotify-id */
1145 typedef struct
1146 {
1147 WL head;
1148 } ANFS;
1149 #endif
1150
1151 /* Heap Entry */
1152 #if EV_HEAP_CACHE_AT
1153 /* a heap element */
1154 typedef struct {
1155 ev_tstamp at;
1156 WT w;
1157 } ANHE;
1158
1159 #define ANHE_w(he) (he).w /* access watcher, read-write */
1160 #define ANHE_at(he) (he).at /* access cached at, read-only */
1161 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1162 #else
1163 /* a heap element */
1164 typedef WT ANHE;
1165
1166 #define ANHE_w(he) (he)
1167 #define ANHE_at(he) (he)->at
1168 #define ANHE_at_cache(he)
1169 #endif
1170
1171 #if EV_MULTIPLICITY
1172
1173 struct ev_loop
1174 {
1175 ev_tstamp ev_rt_now;
1176 #define ev_rt_now ((loop)->ev_rt_now)
1177 #define VAR(name,decl) decl;
1178 #include "ev_vars.h"
1179 #undef VAR
1180 };
1181 #include "ev_wrap.h"
1182
1183 static struct ev_loop default_loop_struct;
1184 struct ev_loop *ev_default_loop_ptr;
1185
1186 #else
1187
1188 ev_tstamp ev_rt_now;
1189 #define VAR(name,decl) static decl;
1190 #include "ev_vars.h"
1191 #undef VAR
1192
1193 static int ev_default_loop_ptr;
1194
1195 #endif
1196
1197 #if EV_FEATURE_API
1198 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1199 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1200 # define EV_INVOKE_PENDING invoke_cb (EV_A)
1201 #else
1202 # define EV_RELEASE_CB (void)0
1203 # define EV_ACQUIRE_CB (void)0
1204 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1205 #endif
1206
1207 #define EVBREAK_RECURSE 0x80
1208
1209 /*****************************************************************************/
1210
1211 #ifndef EV_HAVE_EV_TIME
1212 ev_tstamp
1213 ev_time (void)
1214 {
1215 #if EV_USE_REALTIME
1216 if (expect_true (have_realtime))
1217 {
1218 struct timespec ts;
1219 clock_gettime (CLOCK_REALTIME, &ts);
1220 return ts.tv_sec + ts.tv_nsec * 1e-9;
1221 }
1222 #endif
1223
1224 struct timeval tv;
1225 gettimeofday (&tv, 0);
1226 return tv.tv_sec + tv.tv_usec * 1e-6;
1227 }
1228 #endif
1229
1230 inline_size ev_tstamp
1231 get_clock (void)
1232 {
1233 #if EV_USE_MONOTONIC
1234 if (expect_true (have_monotonic))
1235 {
1236 struct timespec ts;
1237 clock_gettime (CLOCK_MONOTONIC, &ts);
1238 return ts.tv_sec + ts.tv_nsec * 1e-9;
1239 }
1240 #endif
1241
1242 return ev_time ();
1243 }
1244
1245 #if EV_MULTIPLICITY
1246 ev_tstamp
1247 ev_now (EV_P)
1248 {
1249 return ev_rt_now;
1250 }
1251 #endif
1252
1253 void
1254 ev_sleep (ev_tstamp delay)
1255 {
1256 if (delay > 0.)
1257 {
1258 #if EV_USE_NANOSLEEP
1259 struct timespec ts;
1260
1261 EV_TS_SET (ts, delay);
1262 nanosleep (&ts, 0);
1263 #elif defined(_WIN32)
1264 Sleep ((unsigned long)(delay * 1e3));
1265 #else
1266 struct timeval tv;
1267
1268 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1269 /* something not guaranteed by newer posix versions, but guaranteed */
1270 /* by older ones */
1271 EV_TV_SET (tv, delay);
1272 select (0, 0, 0, 0, &tv);
1273 #endif
1274 }
1275 }
1276
1277 /*****************************************************************************/
1278
1279 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1280
1281 /* find a suitable new size for the given array, */
1282 /* hopefully by rounding to a nice-to-malloc size */
1283 inline_size int
1284 array_nextsize (int elem, int cur, int cnt)
1285 {
1286 int ncur = cur + 1;
1287
1288 do
1289 ncur <<= 1;
1290 while (cnt > ncur);
1291
1292 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
1293 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1294 {
1295 ncur *= elem;
1296 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1297 ncur = ncur - sizeof (void *) * 4;
1298 ncur /= elem;
1299 }
1300
1301 return ncur;
1302 }
1303
1304 static void * noinline ecb_cold
1305 array_realloc (int elem, void *base, int *cur, int cnt)
1306 {
1307 *cur = array_nextsize (elem, *cur, cnt);
1308 return ev_realloc (base, elem * *cur);
1309 }
1310
1311 #define array_init_zero(base,count) \
1312 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1313
1314 #define array_needsize(type,base,cur,cnt,init) \
1315 if (expect_false ((cnt) > (cur))) \
1316 { \
1317 int ecb_unused ocur_ = (cur); \
1318 (base) = (type *)array_realloc \
1319 (sizeof (type), (base), &(cur), (cnt)); \
1320 init ((base) + (ocur_), (cur) - ocur_); \
1321 }
1322
1323 #if 0
1324 #define array_slim(type,stem) \
1325 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1326 { \
1327 stem ## max = array_roundsize (stem ## cnt >> 1); \
1328 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1329 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1330 }
1331 #endif
1332
1333 #define array_free(stem, idx) \
1334 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1335
1336 /*****************************************************************************/
1337
1338 /* dummy callback for pending events */
1339 static void noinline
1340 pendingcb (EV_P_ ev_prepare *w, int revents)
1341 {
1342 }
1343
1344 void noinline
1345 ev_feed_event (EV_P_ void *w, int revents)
1346 {
1347 W w_ = (W)w;
1348 int pri = ABSPRI (w_);
1349
1350 if (expect_false (w_->pending))
1351 pendings [pri][w_->pending - 1].events |= revents;
1352 else
1353 {
1354 w_->pending = ++pendingcnt [pri];
1355 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1356 pendings [pri][w_->pending - 1].w = w_;
1357 pendings [pri][w_->pending - 1].events = revents;
1358 }
1359 }
1360
1361 inline_speed void
1362 feed_reverse (EV_P_ W w)
1363 {
1364 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1365 rfeeds [rfeedcnt++] = w;
1366 }
1367
1368 inline_size void
1369 feed_reverse_done (EV_P_ int revents)
1370 {
1371 do
1372 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1373 while (rfeedcnt);
1374 }
1375
1376 inline_speed void
1377 queue_events (EV_P_ W *events, int eventcnt, int type)
1378 {
1379 int i;
1380
1381 for (i = 0; i < eventcnt; ++i)
1382 ev_feed_event (EV_A_ events [i], type);
1383 }
1384
1385 /*****************************************************************************/
1386
1387 inline_speed void
1388 fd_event_nocheck (EV_P_ int fd, int revents)
1389 {
1390 ANFD *anfd = anfds + fd;
1391 ev_io *w;
1392
1393 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1394 {
1395 int ev = w->events & revents;
1396
1397 if (ev)
1398 ev_feed_event (EV_A_ (W)w, ev);
1399 }
1400 }
1401
1402 /* do not submit kernel events for fds that have reify set */
1403 /* because that means they changed while we were polling for new events */
1404 inline_speed void
1405 fd_event (EV_P_ int fd, int revents)
1406 {
1407 ANFD *anfd = anfds + fd;
1408
1409 if (expect_true (!anfd->reify))
1410 fd_event_nocheck (EV_A_ fd, revents);
1411 }
1412
1413 void
1414 ev_feed_fd_event (EV_P_ int fd, int revents)
1415 {
1416 if (fd >= 0 && fd < anfdmax)
1417 fd_event_nocheck (EV_A_ fd, revents);
1418 }
1419
1420 /* make sure the external fd watch events are in-sync */
1421 /* with the kernel/libev internal state */
1422 inline_size void
1423 fd_reify (EV_P)
1424 {
1425 int i;
1426
1427 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1428 for (i = 0; i < fdchangecnt; ++i)
1429 {
1430 int fd = fdchanges [i];
1431 ANFD *anfd = anfds + fd;
1432
1433 if (anfd->reify & EV__IOFDSET && anfd->head)
1434 {
1435 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1436
1437 if (handle != anfd->handle)
1438 {
1439 unsigned long arg;
1440
1441 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1442
1443 /* handle changed, but fd didn't - we need to do it in two steps */
1444 backend_modify (EV_A_ fd, anfd->events, 0);
1445 anfd->events = 0;
1446 anfd->handle = handle;
1447 }
1448 }
1449 }
1450 #endif
1451
1452 for (i = 0; i < fdchangecnt; ++i)
1453 {
1454 int fd = fdchanges [i];
1455 ANFD *anfd = anfds + fd;
1456 ev_io *w;
1457
1458 unsigned char o_events = anfd->events;
1459 unsigned char o_reify = anfd->reify;
1460
1461 anfd->reify = 0;
1462
1463 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1464 {
1465 anfd->events = 0;
1466
1467 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1468 anfd->events |= (unsigned char)w->events;
1469
1470 if (o_events != anfd->events)
1471 o_reify = EV__IOFDSET; /* actually |= */
1472 }
1473
1474 if (o_reify & EV__IOFDSET)
1475 backend_modify (EV_A_ fd, o_events, anfd->events);
1476 }
1477
1478 fdchangecnt = 0;
1479 }
1480
1481 /* something about the given fd changed */
1482 inline_size void
1483 fd_change (EV_P_ int fd, int flags)
1484 {
1485 unsigned char reify = anfds [fd].reify;
1486 anfds [fd].reify |= flags;
1487
1488 if (expect_true (!reify))
1489 {
1490 ++fdchangecnt;
1491 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1492 fdchanges [fdchangecnt - 1] = fd;
1493 }
1494 }
1495
1496 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1497 inline_speed void ecb_cold
1498 fd_kill (EV_P_ int fd)
1499 {
1500 ev_io *w;
1501
1502 while ((w = (ev_io *)anfds [fd].head))
1503 {
1504 ev_io_stop (EV_A_ w);
1505 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1506 }
1507 }
1508
1509 /* check whether the given fd is actually valid, for error recovery */
1510 inline_size int ecb_cold
1511 fd_valid (int fd)
1512 {
1513 #ifdef _WIN32
1514 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1515 #else
1516 return fcntl (fd, F_GETFD) != -1;
1517 #endif
1518 }
1519
1520 /* called on EBADF to verify fds */
1521 static void noinline ecb_cold
1522 fd_ebadf (EV_P)
1523 {
1524 int fd;
1525
1526 for (fd = 0; fd < anfdmax; ++fd)
1527 if (anfds [fd].events)
1528 if (!fd_valid (fd) && errno == EBADF)
1529 fd_kill (EV_A_ fd);
1530 }
1531
1532 /* called on ENOMEM in select/poll to kill some fds and retry */
1533 static void noinline ecb_cold
1534 fd_enomem (EV_P)
1535 {
1536 int fd;
1537
1538 for (fd = anfdmax; fd--; )
1539 if (anfds [fd].events)
1540 {
1541 fd_kill (EV_A_ fd);
1542 break;
1543 }
1544 }
1545
1546 /* usually called after fork if backend needs to re-arm all fds from scratch */
1547 static void noinline
1548 fd_rearm_all (EV_P)
1549 {
1550 int fd;
1551
1552 for (fd = 0; fd < anfdmax; ++fd)
1553 if (anfds [fd].events)
1554 {
1555 anfds [fd].events = 0;
1556 anfds [fd].emask = 0;
1557 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1558 }
1559 }
1560
1561 /* used to prepare libev internal fd's */
1562 /* this is not fork-safe */
1563 inline_speed void
1564 fd_intern (int fd)
1565 {
1566 #ifdef _WIN32
1567 unsigned long arg = 1;
1568 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1569 #else
1570 fcntl (fd, F_SETFD, FD_CLOEXEC);
1571 fcntl (fd, F_SETFL, O_NONBLOCK);
1572 #endif
1573 }
1574
1575 /*****************************************************************************/
1576
1577 /*
1578 * the heap functions want a real array index. array index 0 is guaranteed to not
1579 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1580 * the branching factor of the d-tree.
1581 */
1582
1583 /*
1584 * at the moment we allow libev the luxury of two heaps,
1585 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1586 * which is more cache-efficient.
1587 * the difference is about 5% with 50000+ watchers.
1588 */
1589 #if EV_USE_4HEAP
1590
1591 #define DHEAP 4
1592 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1593 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1594 #define UPHEAP_DONE(p,k) ((p) == (k))
1595
1596 /* away from the root */
1597 inline_speed void
1598 downheap (ANHE *heap, int N, int k)
1599 {
1600 ANHE he = heap [k];
1601 ANHE *E = heap + N + HEAP0;
1602
1603 for (;;)
1604 {
1605 ev_tstamp minat;
1606 ANHE *minpos;
1607 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1608
1609 /* find minimum child */
1610 if (expect_true (pos + DHEAP - 1 < E))
1611 {
1612 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1613 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1614 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1615 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1616 }
1617 else if (pos < E)
1618 {
1619 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1620 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1621 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1622 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1623 }
1624 else
1625 break;
1626
1627 if (ANHE_at (he) <= minat)
1628 break;
1629
1630 heap [k] = *minpos;
1631 ev_active (ANHE_w (*minpos)) = k;
1632
1633 k = minpos - heap;
1634 }
1635
1636 heap [k] = he;
1637 ev_active (ANHE_w (he)) = k;
1638 }
1639
1640 #else /* 4HEAP */
1641
1642 #define HEAP0 1
1643 #define HPARENT(k) ((k) >> 1)
1644 #define UPHEAP_DONE(p,k) (!(p))
1645
1646 /* away from the root */
1647 inline_speed void
1648 downheap (ANHE *heap, int N, int k)
1649 {
1650 ANHE he = heap [k];
1651
1652 for (;;)
1653 {
1654 int c = k << 1;
1655
1656 if (c >= N + HEAP0)
1657 break;
1658
1659 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1660 ? 1 : 0;
1661
1662 if (ANHE_at (he) <= ANHE_at (heap [c]))
1663 break;
1664
1665 heap [k] = heap [c];
1666 ev_active (ANHE_w (heap [k])) = k;
1667
1668 k = c;
1669 }
1670
1671 heap [k] = he;
1672 ev_active (ANHE_w (he)) = k;
1673 }
1674 #endif
1675
1676 /* towards the root */
1677 inline_speed void
1678 upheap (ANHE *heap, int k)
1679 {
1680 ANHE he = heap [k];
1681
1682 for (;;)
1683 {
1684 int p = HPARENT (k);
1685
1686 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1687 break;
1688
1689 heap [k] = heap [p];
1690 ev_active (ANHE_w (heap [k])) = k;
1691 k = p;
1692 }
1693
1694 heap [k] = he;
1695 ev_active (ANHE_w (he)) = k;
1696 }
1697
1698 /* move an element suitably so it is in a correct place */
1699 inline_size void
1700 adjustheap (ANHE *heap, int N, int k)
1701 {
1702 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1703 upheap (heap, k);
1704 else
1705 downheap (heap, N, k);
1706 }
1707
1708 /* rebuild the heap: this function is used only once and executed rarely */
1709 inline_size void
1710 reheap (ANHE *heap, int N)
1711 {
1712 int i;
1713
1714 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1715 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1716 for (i = 0; i < N; ++i)
1717 upheap (heap, i + HEAP0);
1718 }
1719
1720 /*****************************************************************************/
1721
1722 /* associate signal watchers to a signal signal */
1723 typedef struct
1724 {
1725 EV_ATOMIC_T pending;
1726 #if EV_MULTIPLICITY
1727 EV_P;
1728 #endif
1729 WL head;
1730 } ANSIG;
1731
1732 static ANSIG signals [EV_NSIG - 1];
1733
1734 /*****************************************************************************/
1735
1736 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1737
1738 static void noinline ecb_cold
1739 evpipe_init (EV_P)
1740 {
1741 if (!ev_is_active (&pipe_w))
1742 {
1743 # if EV_USE_EVENTFD
1744 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1745 if (evfd < 0 && errno == EINVAL)
1746 evfd = eventfd (0, 0);
1747
1748 if (evfd >= 0)
1749 {
1750 evpipe [0] = -1;
1751 fd_intern (evfd); /* doing it twice doesn't hurt */
1752 ev_io_set (&pipe_w, evfd, EV_READ);
1753 }
1754 else
1755 # endif
1756 {
1757 while (pipe (evpipe))
1758 ev_syserr ("(libev) error creating signal/async pipe");
1759
1760 fd_intern (evpipe [0]);
1761 fd_intern (evpipe [1]);
1762 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1763 }
1764
1765 ev_io_start (EV_A_ &pipe_w);
1766 ev_unref (EV_A); /* watcher should not keep loop alive */
1767 }
1768 }
1769
1770 inline_speed void
1771 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1772 {
1773 if (expect_true (*flag))
1774 return;
1775
1776 *flag = 1;
1777
1778 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1779
1780 pipe_write_skipped = 1;
1781
1782 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1783
1784 if (pipe_write_wanted)
1785 {
1786 int old_errno;
1787
1788 pipe_write_skipped = 0; /* just an optimisation, no fence needed */
1789
1790 old_errno = errno; /* save errno because write will clobber it */
1791
1792 #if EV_USE_EVENTFD
1793 if (evfd >= 0)
1794 {
1795 uint64_t counter = 1;
1796 write (evfd, &counter, sizeof (uint64_t));
1797 }
1798 else
1799 #endif
1800 {
1801 /* win32 people keep sending patches that change this write() to send() */
1802 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1803 /* so when you think this write should be a send instead, please find out */
1804 /* where your send() is from - it's definitely not the microsoft send, and */
1805 /* tell me. thank you. */
1806 write (evpipe [1], &(evpipe [1]), 1);
1807 }
1808
1809 errno = old_errno;
1810 }
1811 }
1812
1813 /* called whenever the libev signal pipe */
1814 /* got some events (signal, async) */
1815 static void
1816 pipecb (EV_P_ ev_io *iow, int revents)
1817 {
1818 int i;
1819
1820 if (revents & EV_READ)
1821 {
1822 #if EV_USE_EVENTFD
1823 if (evfd >= 0)
1824 {
1825 uint64_t counter;
1826 read (evfd, &counter, sizeof (uint64_t));
1827 }
1828 else
1829 #endif
1830 {
1831 char dummy;
1832 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1833 read (evpipe [0], &dummy, 1);
1834 }
1835 }
1836
1837 pipe_write_skipped = 0;
1838
1839 #if EV_SIGNAL_ENABLE
1840 if (sig_pending)
1841 {
1842 sig_pending = 0;
1843
1844 for (i = EV_NSIG - 1; i--; )
1845 if (expect_false (signals [i].pending))
1846 ev_feed_signal_event (EV_A_ i + 1);
1847 }
1848 #endif
1849
1850 #if EV_ASYNC_ENABLE
1851 if (async_pending)
1852 {
1853 async_pending = 0;
1854
1855 for (i = asynccnt; i--; )
1856 if (asyncs [i]->sent)
1857 {
1858 asyncs [i]->sent = 0;
1859 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1860 }
1861 }
1862 #endif
1863 }
1864
1865 /*****************************************************************************/
1866
1867 void
1868 ev_feed_signal (int signum)
1869 {
1870 #if EV_MULTIPLICITY
1871 EV_P = signals [signum - 1].loop;
1872
1873 if (!EV_A)
1874 return;
1875 #endif
1876
1877 if (!ev_active (&pipe_w))
1878 return;
1879
1880 signals [signum - 1].pending = 1;
1881 evpipe_write (EV_A_ &sig_pending);
1882 }
1883
1884 static void
1885 ev_sighandler (int signum)
1886 {
1887 #ifdef _WIN32
1888 signal (signum, ev_sighandler);
1889 #endif
1890
1891 ev_feed_signal (signum);
1892 }
1893
1894 void noinline
1895 ev_feed_signal_event (EV_P_ int signum)
1896 {
1897 WL w;
1898
1899 if (expect_false (signum <= 0 || signum > EV_NSIG))
1900 return;
1901
1902 --signum;
1903
1904 #if EV_MULTIPLICITY
1905 /* it is permissible to try to feed a signal to the wrong loop */
1906 /* or, likely more useful, feeding a signal nobody is waiting for */
1907
1908 if (expect_false (signals [signum].loop != EV_A))
1909 return;
1910 #endif
1911
1912 signals [signum].pending = 0;
1913
1914 for (w = signals [signum].head; w; w = w->next)
1915 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1916 }
1917
1918 #if EV_USE_SIGNALFD
1919 static void
1920 sigfdcb (EV_P_ ev_io *iow, int revents)
1921 {
1922 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1923
1924 for (;;)
1925 {
1926 ssize_t res = read (sigfd, si, sizeof (si));
1927
1928 /* not ISO-C, as res might be -1, but works with SuS */
1929 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1930 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1931
1932 if (res < (ssize_t)sizeof (si))
1933 break;
1934 }
1935 }
1936 #endif
1937
1938 #endif
1939
1940 /*****************************************************************************/
1941
1942 #if EV_CHILD_ENABLE
1943 static WL childs [EV_PID_HASHSIZE];
1944
1945 static ev_signal childev;
1946
1947 #ifndef WIFCONTINUED
1948 # define WIFCONTINUED(status) 0
1949 #endif
1950
1951 /* handle a single child status event */
1952 inline_speed void
1953 child_reap (EV_P_ int chain, int pid, int status)
1954 {
1955 ev_child *w;
1956 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1957
1958 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1959 {
1960 if ((w->pid == pid || !w->pid)
1961 && (!traced || (w->flags & 1)))
1962 {
1963 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1964 w->rpid = pid;
1965 w->rstatus = status;
1966 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1967 }
1968 }
1969 }
1970
1971 #ifndef WCONTINUED
1972 # define WCONTINUED 0
1973 #endif
1974
1975 /* called on sigchld etc., calls waitpid */
1976 static void
1977 childcb (EV_P_ ev_signal *sw, int revents)
1978 {
1979 int pid, status;
1980
1981 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1982 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1983 if (!WCONTINUED
1984 || errno != EINVAL
1985 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1986 return;
1987
1988 /* make sure we are called again until all children have been reaped */
1989 /* we need to do it this way so that the callback gets called before we continue */
1990 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1991
1992 child_reap (EV_A_ pid, pid, status);
1993 if ((EV_PID_HASHSIZE) > 1)
1994 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1995 }
1996
1997 #endif
1998
1999 /*****************************************************************************/
2000
2001 #if EV_USE_IOCP
2002 # include "ev_iocp.c"
2003 #endif
2004 #if EV_USE_PORT
2005 # include "ev_port.c"
2006 #endif
2007 #if EV_USE_KQUEUE
2008 # include "ev_kqueue.c"
2009 #endif
2010 #if EV_USE_EPOLL
2011 # include "ev_epoll.c"
2012 #endif
2013 #if EV_USE_POLL
2014 # include "ev_poll.c"
2015 #endif
2016 #if EV_USE_SELECT
2017 # include "ev_select.c"
2018 #endif
2019
2020 int ecb_cold
2021 ev_version_major (void)
2022 {
2023 return EV_VERSION_MAJOR;
2024 }
2025
2026 int ecb_cold
2027 ev_version_minor (void)
2028 {
2029 return EV_VERSION_MINOR;
2030 }
2031
2032 /* return true if we are running with elevated privileges and should ignore env variables */
2033 int inline_size ecb_cold
2034 enable_secure (void)
2035 {
2036 #ifdef _WIN32
2037 return 0;
2038 #else
2039 return getuid () != geteuid ()
2040 || getgid () != getegid ();
2041 #endif
2042 }
2043
2044 unsigned int ecb_cold
2045 ev_supported_backends (void)
2046 {
2047 unsigned int flags = 0;
2048
2049 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2050 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2051 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2052 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2053 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2054
2055 return flags;
2056 }
2057
2058 unsigned int ecb_cold
2059 ev_recommended_backends (void)
2060 {
2061 unsigned int flags = ev_supported_backends ();
2062
2063 #ifndef __NetBSD__
2064 /* kqueue is borked on everything but netbsd apparently */
2065 /* it usually doesn't work correctly on anything but sockets and pipes */
2066 flags &= ~EVBACKEND_KQUEUE;
2067 #endif
2068 #ifdef __APPLE__
2069 /* only select works correctly on that "unix-certified" platform */
2070 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2071 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2072 #endif
2073 #ifdef __FreeBSD__
2074 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2075 #endif
2076
2077 return flags;
2078 }
2079
2080 unsigned int ecb_cold
2081 ev_embeddable_backends (void)
2082 {
2083 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2084
2085 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2086 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2087 flags &= ~EVBACKEND_EPOLL;
2088
2089 return flags;
2090 }
2091
2092 unsigned int
2093 ev_backend (EV_P)
2094 {
2095 return backend;
2096 }
2097
2098 #if EV_FEATURE_API
2099 unsigned int
2100 ev_iteration (EV_P)
2101 {
2102 return loop_count;
2103 }
2104
2105 unsigned int
2106 ev_depth (EV_P)
2107 {
2108 return loop_depth;
2109 }
2110
2111 void
2112 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
2113 {
2114 io_blocktime = interval;
2115 }
2116
2117 void
2118 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
2119 {
2120 timeout_blocktime = interval;
2121 }
2122
2123 void
2124 ev_set_userdata (EV_P_ void *data)
2125 {
2126 userdata = data;
2127 }
2128
2129 void *
2130 ev_userdata (EV_P)
2131 {
2132 return userdata;
2133 }
2134
2135 void
2136 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
2137 {
2138 invoke_cb = invoke_pending_cb;
2139 }
2140
2141 void
2142 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
2143 {
2144 release_cb = release;
2145 acquire_cb = acquire;
2146 }
2147 #endif
2148
2149 /* initialise a loop structure, must be zero-initialised */
2150 static void noinline ecb_cold
2151 loop_init (EV_P_ unsigned int flags)
2152 {
2153 if (!backend)
2154 {
2155 origflags = flags;
2156
2157 #if EV_USE_REALTIME
2158 if (!have_realtime)
2159 {
2160 struct timespec ts;
2161
2162 if (!clock_gettime (CLOCK_REALTIME, &ts))
2163 have_realtime = 1;
2164 }
2165 #endif
2166
2167 #if EV_USE_MONOTONIC
2168 if (!have_monotonic)
2169 {
2170 struct timespec ts;
2171
2172 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2173 have_monotonic = 1;
2174 }
2175 #endif
2176
2177 /* pid check not overridable via env */
2178 #ifndef _WIN32
2179 if (flags & EVFLAG_FORKCHECK)
2180 curpid = getpid ();
2181 #endif
2182
2183 if (!(flags & EVFLAG_NOENV)
2184 && !enable_secure ()
2185 && getenv ("LIBEV_FLAGS"))
2186 flags = atoi (getenv ("LIBEV_FLAGS"));
2187
2188 ev_rt_now = ev_time ();
2189 mn_now = get_clock ();
2190 now_floor = mn_now;
2191 rtmn_diff = ev_rt_now - mn_now;
2192 #if EV_FEATURE_API
2193 invoke_cb = ev_invoke_pending;
2194 #endif
2195
2196 io_blocktime = 0.;
2197 timeout_blocktime = 0.;
2198 backend = 0;
2199 backend_fd = -1;
2200 sig_pending = 0;
2201 #if EV_ASYNC_ENABLE
2202 async_pending = 0;
2203 #endif
2204 pipe_write_skipped = 0;
2205 pipe_write_wanted = 0;
2206 #if EV_USE_INOTIFY
2207 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2208 #endif
2209 #if EV_USE_SIGNALFD
2210 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2211 #endif
2212
2213 if (!(flags & EVBACKEND_MASK))
2214 flags |= ev_recommended_backends ();
2215
2216 #if EV_USE_IOCP
2217 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2218 #endif
2219 #if EV_USE_PORT
2220 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2221 #endif
2222 #if EV_USE_KQUEUE
2223 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2224 #endif
2225 #if EV_USE_EPOLL
2226 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2227 #endif
2228 #if EV_USE_POLL
2229 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2230 #endif
2231 #if EV_USE_SELECT
2232 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2233 #endif
2234
2235 ev_prepare_init (&pending_w, pendingcb);
2236
2237 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2238 ev_init (&pipe_w, pipecb);
2239 ev_set_priority (&pipe_w, EV_MAXPRI);
2240 #endif
2241 }
2242 }
2243
2244 /* free up a loop structure */
2245 void ecb_cold
2246 ev_loop_destroy (EV_P)
2247 {
2248 int i;
2249
2250 #if EV_MULTIPLICITY
2251 /* mimic free (0) */
2252 if (!EV_A)
2253 return;
2254 #endif
2255
2256 #if EV_CLEANUP_ENABLE
2257 /* queue cleanup watchers (and execute them) */
2258 if (expect_false (cleanupcnt))
2259 {
2260 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2261 EV_INVOKE_PENDING;
2262 }
2263 #endif
2264
2265 #if EV_CHILD_ENABLE
2266 if (ev_is_active (&childev))
2267 {
2268 ev_ref (EV_A); /* child watcher */
2269 ev_signal_stop (EV_A_ &childev);
2270 }
2271 #endif
2272
2273 if (ev_is_active (&pipe_w))
2274 {
2275 /*ev_ref (EV_A);*/
2276 /*ev_io_stop (EV_A_ &pipe_w);*/
2277
2278 #if EV_USE_EVENTFD
2279 if (evfd >= 0)
2280 close (evfd);
2281 #endif
2282
2283 if (evpipe [0] >= 0)
2284 {
2285 EV_WIN32_CLOSE_FD (evpipe [0]);
2286 EV_WIN32_CLOSE_FD (evpipe [1]);
2287 }
2288 }
2289
2290 #if EV_USE_SIGNALFD
2291 if (ev_is_active (&sigfd_w))
2292 close (sigfd);
2293 #endif
2294
2295 #if EV_USE_INOTIFY
2296 if (fs_fd >= 0)
2297 close (fs_fd);
2298 #endif
2299
2300 if (backend_fd >= 0)
2301 close (backend_fd);
2302
2303 #if EV_USE_IOCP
2304 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2305 #endif
2306 #if EV_USE_PORT
2307 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2308 #endif
2309 #if EV_USE_KQUEUE
2310 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2311 #endif
2312 #if EV_USE_EPOLL
2313 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2314 #endif
2315 #if EV_USE_POLL
2316 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2317 #endif
2318 #if EV_USE_SELECT
2319 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2320 #endif
2321
2322 for (i = NUMPRI; i--; )
2323 {
2324 array_free (pending, [i]);
2325 #if EV_IDLE_ENABLE
2326 array_free (idle, [i]);
2327 #endif
2328 }
2329
2330 ev_free (anfds); anfds = 0; anfdmax = 0;
2331
2332 /* have to use the microsoft-never-gets-it-right macro */
2333 array_free (rfeed, EMPTY);
2334 array_free (fdchange, EMPTY);
2335 array_free (timer, EMPTY);
2336 #if EV_PERIODIC_ENABLE
2337 array_free (periodic, EMPTY);
2338 #endif
2339 #if EV_FORK_ENABLE
2340 array_free (fork, EMPTY);
2341 #endif
2342 #if EV_CLEANUP_ENABLE
2343 array_free (cleanup, EMPTY);
2344 #endif
2345 array_free (prepare, EMPTY);
2346 array_free (check, EMPTY);
2347 #if EV_ASYNC_ENABLE
2348 array_free (async, EMPTY);
2349 #endif
2350
2351 backend = 0;
2352
2353 #if EV_MULTIPLICITY
2354 if (ev_is_default_loop (EV_A))
2355 #endif
2356 ev_default_loop_ptr = 0;
2357 #if EV_MULTIPLICITY
2358 else
2359 ev_free (EV_A);
2360 #endif
2361 }
2362
2363 #if EV_USE_INOTIFY
2364 inline_size void infy_fork (EV_P);
2365 #endif
2366
2367 inline_size void
2368 loop_fork (EV_P)
2369 {
2370 #if EV_USE_PORT
2371 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2372 #endif
2373 #if EV_USE_KQUEUE
2374 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2375 #endif
2376 #if EV_USE_EPOLL
2377 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2378 #endif
2379 #if EV_USE_INOTIFY
2380 infy_fork (EV_A);
2381 #endif
2382
2383 if (ev_is_active (&pipe_w))
2384 {
2385 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2386
2387 ev_ref (EV_A);
2388 ev_io_stop (EV_A_ &pipe_w);
2389
2390 #if EV_USE_EVENTFD
2391 if (evfd >= 0)
2392 close (evfd);
2393 #endif
2394
2395 if (evpipe [0] >= 0)
2396 {
2397 EV_WIN32_CLOSE_FD (evpipe [0]);
2398 EV_WIN32_CLOSE_FD (evpipe [1]);
2399 }
2400
2401 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2402 evpipe_init (EV_A);
2403 /* now iterate over everything, in case we missed something */
2404 pipecb (EV_A_ &pipe_w, EV_READ);
2405 #endif
2406 }
2407
2408 postfork = 0;
2409 }
2410
2411 #if EV_MULTIPLICITY
2412
2413 struct ev_loop * ecb_cold
2414 ev_loop_new (unsigned int flags)
2415 {
2416 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2417
2418 memset (EV_A, 0, sizeof (struct ev_loop));
2419 loop_init (EV_A_ flags);
2420
2421 if (ev_backend (EV_A))
2422 return EV_A;
2423
2424 ev_free (EV_A);
2425 return 0;
2426 }
2427
2428 #endif /* multiplicity */
2429
2430 #if EV_VERIFY
2431 static void noinline ecb_cold
2432 verify_watcher (EV_P_ W w)
2433 {
2434 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2435
2436 if (w->pending)
2437 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2438 }
2439
2440 static void noinline ecb_cold
2441 verify_heap (EV_P_ ANHE *heap, int N)
2442 {
2443 int i;
2444
2445 for (i = HEAP0; i < N + HEAP0; ++i)
2446 {
2447 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2448 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2449 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2450
2451 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2452 }
2453 }
2454
2455 static void noinline ecb_cold
2456 array_verify (EV_P_ W *ws, int cnt)
2457 {
2458 while (cnt--)
2459 {
2460 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2461 verify_watcher (EV_A_ ws [cnt]);
2462 }
2463 }
2464 #endif
2465
2466 #if EV_FEATURE_API
2467 void ecb_cold
2468 ev_verify (EV_P)
2469 {
2470 #if EV_VERIFY
2471 int i;
2472 WL w;
2473
2474 assert (activecnt >= -1);
2475
2476 assert (fdchangemax >= fdchangecnt);
2477 for (i = 0; i < fdchangecnt; ++i)
2478 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2479
2480 assert (anfdmax >= 0);
2481 for (i = 0; i < anfdmax; ++i)
2482 for (w = anfds [i].head; w; w = w->next)
2483 {
2484 verify_watcher (EV_A_ (W)w);
2485 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2486 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2487 }
2488
2489 assert (timermax >= timercnt);
2490 verify_heap (EV_A_ timers, timercnt);
2491
2492 #if EV_PERIODIC_ENABLE
2493 assert (periodicmax >= periodiccnt);
2494 verify_heap (EV_A_ periodics, periodiccnt);
2495 #endif
2496
2497 for (i = NUMPRI; i--; )
2498 {
2499 assert (pendingmax [i] >= pendingcnt [i]);
2500 #if EV_IDLE_ENABLE
2501 assert (idleall >= 0);
2502 assert (idlemax [i] >= idlecnt [i]);
2503 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2504 #endif
2505 }
2506
2507 #if EV_FORK_ENABLE
2508 assert (forkmax >= forkcnt);
2509 array_verify (EV_A_ (W *)forks, forkcnt);
2510 #endif
2511
2512 #if EV_CLEANUP_ENABLE
2513 assert (cleanupmax >= cleanupcnt);
2514 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2515 #endif
2516
2517 #if EV_ASYNC_ENABLE
2518 assert (asyncmax >= asynccnt);
2519 array_verify (EV_A_ (W *)asyncs, asynccnt);
2520 #endif
2521
2522 #if EV_PREPARE_ENABLE
2523 assert (preparemax >= preparecnt);
2524 array_verify (EV_A_ (W *)prepares, preparecnt);
2525 #endif
2526
2527 #if EV_CHECK_ENABLE
2528 assert (checkmax >= checkcnt);
2529 array_verify (EV_A_ (W *)checks, checkcnt);
2530 #endif
2531
2532 # if 0
2533 #if EV_CHILD_ENABLE
2534 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2535 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2536 #endif
2537 # endif
2538 #endif
2539 }
2540 #endif
2541
2542 #if EV_MULTIPLICITY
2543 struct ev_loop * ecb_cold
2544 #else
2545 int
2546 #endif
2547 ev_default_loop (unsigned int flags)
2548 {
2549 if (!ev_default_loop_ptr)
2550 {
2551 #if EV_MULTIPLICITY
2552 EV_P = ev_default_loop_ptr = &default_loop_struct;
2553 #else
2554 ev_default_loop_ptr = 1;
2555 #endif
2556
2557 loop_init (EV_A_ flags);
2558
2559 if (ev_backend (EV_A))
2560 {
2561 #if EV_CHILD_ENABLE
2562 ev_signal_init (&childev, childcb, SIGCHLD);
2563 ev_set_priority (&childev, EV_MAXPRI);
2564 ev_signal_start (EV_A_ &childev);
2565 ev_unref (EV_A); /* child watcher should not keep loop alive */
2566 #endif
2567 }
2568 else
2569 ev_default_loop_ptr = 0;
2570 }
2571
2572 return ev_default_loop_ptr;
2573 }
2574
2575 void
2576 ev_loop_fork (EV_P)
2577 {
2578 postfork = 1; /* must be in line with ev_default_fork */
2579 }
2580
2581 /*****************************************************************************/
2582
2583 void
2584 ev_invoke (EV_P_ void *w, int revents)
2585 {
2586 EV_CB_INVOKE ((W)w, revents);
2587 }
2588
2589 unsigned int
2590 ev_pending_count (EV_P)
2591 {
2592 int pri;
2593 unsigned int count = 0;
2594
2595 for (pri = NUMPRI; pri--; )
2596 count += pendingcnt [pri];
2597
2598 return count;
2599 }
2600
2601 void noinline
2602 ev_invoke_pending (EV_P)
2603 {
2604 int pri;
2605
2606 for (pri = NUMPRI; pri--; )
2607 while (pendingcnt [pri])
2608 {
2609 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2610
2611 p->w->pending = 0;
2612 EV_CB_INVOKE (p->w, p->events);
2613 EV_FREQUENT_CHECK;
2614 }
2615 }
2616
2617 #if EV_IDLE_ENABLE
2618 /* make idle watchers pending. this handles the "call-idle */
2619 /* only when higher priorities are idle" logic */
2620 inline_size void
2621 idle_reify (EV_P)
2622 {
2623 if (expect_false (idleall))
2624 {
2625 int pri;
2626
2627 for (pri = NUMPRI; pri--; )
2628 {
2629 if (pendingcnt [pri])
2630 break;
2631
2632 if (idlecnt [pri])
2633 {
2634 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2635 break;
2636 }
2637 }
2638 }
2639 }
2640 #endif
2641
2642 /* make timers pending */
2643 inline_size void
2644 timers_reify (EV_P)
2645 {
2646 EV_FREQUENT_CHECK;
2647
2648 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2649 {
2650 do
2651 {
2652 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2653
2654 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2655
2656 /* first reschedule or stop timer */
2657 if (w->repeat)
2658 {
2659 ev_at (w) += w->repeat;
2660 if (ev_at (w) < mn_now)
2661 ev_at (w) = mn_now;
2662
2663 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2664
2665 ANHE_at_cache (timers [HEAP0]);
2666 downheap (timers, timercnt, HEAP0);
2667 }
2668 else
2669 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2670
2671 EV_FREQUENT_CHECK;
2672 feed_reverse (EV_A_ (W)w);
2673 }
2674 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2675
2676 feed_reverse_done (EV_A_ EV_TIMER);
2677 }
2678 }
2679
2680 #if EV_PERIODIC_ENABLE
2681
2682 static void noinline
2683 periodic_recalc (EV_P_ ev_periodic *w)
2684 {
2685 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2686 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2687
2688 /* the above almost always errs on the low side */
2689 while (at <= ev_rt_now)
2690 {
2691 ev_tstamp nat = at + w->interval;
2692
2693 /* when resolution fails us, we use ev_rt_now */
2694 if (expect_false (nat == at))
2695 {
2696 at = ev_rt_now;
2697 break;
2698 }
2699
2700 at = nat;
2701 }
2702
2703 ev_at (w) = at;
2704 }
2705
2706 /* make periodics pending */
2707 inline_size void
2708 periodics_reify (EV_P)
2709 {
2710 EV_FREQUENT_CHECK;
2711
2712 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2713 {
2714 int feed_count = 0;
2715
2716 do
2717 {
2718 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2719
2720 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2721
2722 /* first reschedule or stop timer */
2723 if (w->reschedule_cb)
2724 {
2725 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2726
2727 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2728
2729 ANHE_at_cache (periodics [HEAP0]);
2730 downheap (periodics, periodiccnt, HEAP0);
2731 }
2732 else if (w->interval)
2733 {
2734 periodic_recalc (EV_A_ w);
2735 ANHE_at_cache (periodics [HEAP0]);
2736 downheap (periodics, periodiccnt, HEAP0);
2737 }
2738 else
2739 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2740
2741 EV_FREQUENT_CHECK;
2742 feed_reverse (EV_A_ (W)w);
2743 }
2744 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2745
2746 feed_reverse_done (EV_A_ EV_PERIODIC);
2747 }
2748 }
2749
2750 /* simply recalculate all periodics */
2751 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2752 static void noinline ecb_cold
2753 periodics_reschedule (EV_P)
2754 {
2755 int i;
2756
2757 /* adjust periodics after time jump */
2758 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2759 {
2760 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2761
2762 if (w->reschedule_cb)
2763 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2764 else if (w->interval)
2765 periodic_recalc (EV_A_ w);
2766
2767 ANHE_at_cache (periodics [i]);
2768 }
2769
2770 reheap (periodics, periodiccnt);
2771 }
2772 #endif
2773
2774 /* adjust all timers by a given offset */
2775 static void noinline ecb_cold
2776 timers_reschedule (EV_P_ ev_tstamp adjust)
2777 {
2778 int i;
2779
2780 for (i = 0; i < timercnt; ++i)
2781 {
2782 ANHE *he = timers + i + HEAP0;
2783 ANHE_w (*he)->at += adjust;
2784 ANHE_at_cache (*he);
2785 }
2786 }
2787
2788 /* fetch new monotonic and realtime times from the kernel */
2789 /* also detect if there was a timejump, and act accordingly */
2790 inline_speed void
2791 time_update (EV_P_ ev_tstamp max_block)
2792 {
2793 #if EV_USE_MONOTONIC
2794 if (expect_true (have_monotonic))
2795 {
2796 int i;
2797 ev_tstamp odiff = rtmn_diff;
2798
2799 mn_now = get_clock ();
2800
2801 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2802 /* interpolate in the meantime */
2803 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2804 {
2805 ev_rt_now = rtmn_diff + mn_now;
2806 return;
2807 }
2808
2809 now_floor = mn_now;
2810 ev_rt_now = ev_time ();
2811
2812 /* loop a few times, before making important decisions.
2813 * on the choice of "4": one iteration isn't enough,
2814 * in case we get preempted during the calls to
2815 * ev_time and get_clock. a second call is almost guaranteed
2816 * to succeed in that case, though. and looping a few more times
2817 * doesn't hurt either as we only do this on time-jumps or
2818 * in the unlikely event of having been preempted here.
2819 */
2820 for (i = 4; --i; )
2821 {
2822 ev_tstamp diff;
2823 rtmn_diff = ev_rt_now - mn_now;
2824
2825 diff = odiff - rtmn_diff;
2826
2827 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2828 return; /* all is well */
2829
2830 ev_rt_now = ev_time ();
2831 mn_now = get_clock ();
2832 now_floor = mn_now;
2833 }
2834
2835 /* no timer adjustment, as the monotonic clock doesn't jump */
2836 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2837 # if EV_PERIODIC_ENABLE
2838 periodics_reschedule (EV_A);
2839 # endif
2840 }
2841 else
2842 #endif
2843 {
2844 ev_rt_now = ev_time ();
2845
2846 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2847 {
2848 /* adjust timers. this is easy, as the offset is the same for all of them */
2849 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2850 #if EV_PERIODIC_ENABLE
2851 periodics_reschedule (EV_A);
2852 #endif
2853 }
2854
2855 mn_now = ev_rt_now;
2856 }
2857 }
2858
2859 void
2860 ev_run (EV_P_ int flags)
2861 {
2862 #if EV_FEATURE_API
2863 ++loop_depth;
2864 #endif
2865
2866 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2867
2868 loop_done = EVBREAK_CANCEL;
2869
2870 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2871
2872 do
2873 {
2874 #if EV_VERIFY >= 2
2875 ev_verify (EV_A);
2876 #endif
2877
2878 #ifndef _WIN32
2879 if (expect_false (curpid)) /* penalise the forking check even more */
2880 if (expect_false (getpid () != curpid))
2881 {
2882 curpid = getpid ();
2883 postfork = 1;
2884 }
2885 #endif
2886
2887 #if EV_FORK_ENABLE
2888 /* we might have forked, so queue fork handlers */
2889 if (expect_false (postfork))
2890 if (forkcnt)
2891 {
2892 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2893 EV_INVOKE_PENDING;
2894 }
2895 #endif
2896
2897 #if EV_PREPARE_ENABLE
2898 /* queue prepare watchers (and execute them) */
2899 if (expect_false (preparecnt))
2900 {
2901 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2902 EV_INVOKE_PENDING;
2903 }
2904 #endif
2905
2906 if (expect_false (loop_done))
2907 break;
2908
2909 /* we might have forked, so reify kernel state if necessary */
2910 if (expect_false (postfork))
2911 loop_fork (EV_A);
2912
2913 /* update fd-related kernel structures */
2914 fd_reify (EV_A);
2915
2916 /* calculate blocking time */
2917 {
2918 ev_tstamp waittime = 0.;
2919 ev_tstamp sleeptime = 0.;
2920
2921 /* remember old timestamp for io_blocktime calculation */
2922 ev_tstamp prev_mn_now = mn_now;
2923
2924 /* update time to cancel out callback processing overhead */
2925 time_update (EV_A_ 1e100);
2926
2927 /* from now on, we want a pipe-wake-up */
2928 pipe_write_wanted = 1;
2929
2930 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
2931
2932 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2933 {
2934 waittime = MAX_BLOCKTIME;
2935
2936 if (timercnt)
2937 {
2938 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2939 if (waittime > to) waittime = to;
2940 }
2941
2942 #if EV_PERIODIC_ENABLE
2943 if (periodiccnt)
2944 {
2945 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2946 if (waittime > to) waittime = to;
2947 }
2948 #endif
2949
2950 /* don't let timeouts decrease the waittime below timeout_blocktime */
2951 if (expect_false (waittime < timeout_blocktime))
2952 waittime = timeout_blocktime;
2953
2954 /* at this point, we NEED to wait, so we have to ensure */
2955 /* to pass a minimum nonzero value to the backend */
2956 if (expect_false (waittime < backend_mintime))
2957 waittime = backend_mintime;
2958
2959 /* extra check because io_blocktime is commonly 0 */
2960 if (expect_false (io_blocktime))
2961 {
2962 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2963
2964 if (sleeptime > waittime - backend_mintime)
2965 sleeptime = waittime - backend_mintime;
2966
2967 if (expect_true (sleeptime > 0.))
2968 {
2969 ev_sleep (sleeptime);
2970 waittime -= sleeptime;
2971 }
2972 }
2973 }
2974
2975 #if EV_FEATURE_API
2976 ++loop_count;
2977 #endif
2978 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2979 backend_poll (EV_A_ waittime);
2980 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2981
2982 pipe_write_wanted = 0; /* just an optimsiation, no fence needed */
2983
2984 if (pipe_write_skipped)
2985 {
2986 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
2987 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2988 }
2989
2990
2991 /* update ev_rt_now, do magic */
2992 time_update (EV_A_ waittime + sleeptime);
2993 }
2994
2995 /* queue pending timers and reschedule them */
2996 timers_reify (EV_A); /* relative timers called last */
2997 #if EV_PERIODIC_ENABLE
2998 periodics_reify (EV_A); /* absolute timers called first */
2999 #endif
3000
3001 #if EV_IDLE_ENABLE
3002 /* queue idle watchers unless other events are pending */
3003 idle_reify (EV_A);
3004 #endif
3005
3006 #if EV_CHECK_ENABLE
3007 /* queue check watchers, to be executed first */
3008 if (expect_false (checkcnt))
3009 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3010 #endif
3011
3012 EV_INVOKE_PENDING;
3013 }
3014 while (expect_true (
3015 activecnt
3016 && !loop_done
3017 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3018 ));
3019
3020 if (loop_done == EVBREAK_ONE)
3021 loop_done = EVBREAK_CANCEL;
3022
3023 #if EV_FEATURE_API
3024 --loop_depth;
3025 #endif
3026 }
3027
3028 void
3029 ev_break (EV_P_ int how)
3030 {
3031 loop_done = how;
3032 }
3033
3034 void
3035 ev_ref (EV_P)
3036 {
3037 ++activecnt;
3038 }
3039
3040 void
3041 ev_unref (EV_P)
3042 {
3043 --activecnt;
3044 }
3045
3046 void
3047 ev_now_update (EV_P)
3048 {
3049 time_update (EV_A_ 1e100);
3050 }
3051
3052 void
3053 ev_suspend (EV_P)
3054 {
3055 ev_now_update (EV_A);
3056 }
3057
3058 void
3059 ev_resume (EV_P)
3060 {
3061 ev_tstamp mn_prev = mn_now;
3062
3063 ev_now_update (EV_A);
3064 timers_reschedule (EV_A_ mn_now - mn_prev);
3065 #if EV_PERIODIC_ENABLE
3066 /* TODO: really do this? */
3067 periodics_reschedule (EV_A);
3068 #endif
3069 }
3070
3071 /*****************************************************************************/
3072 /* singly-linked list management, used when the expected list length is short */
3073
3074 inline_size void
3075 wlist_add (WL *head, WL elem)
3076 {
3077 elem->next = *head;
3078 *head = elem;
3079 }
3080
3081 inline_size void
3082 wlist_del (WL *head, WL elem)
3083 {
3084 while (*head)
3085 {
3086 if (expect_true (*head == elem))
3087 {
3088 *head = elem->next;
3089 break;
3090 }
3091
3092 head = &(*head)->next;
3093 }
3094 }
3095
3096 /* internal, faster, version of ev_clear_pending */
3097 inline_speed void
3098 clear_pending (EV_P_ W w)
3099 {
3100 if (w->pending)
3101 {
3102 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3103 w->pending = 0;
3104 }
3105 }
3106
3107 int
3108 ev_clear_pending (EV_P_ void *w)
3109 {
3110 W w_ = (W)w;
3111 int pending = w_->pending;
3112
3113 if (expect_true (pending))
3114 {
3115 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3116 p->w = (W)&pending_w;
3117 w_->pending = 0;
3118 return p->events;
3119 }
3120 else
3121 return 0;
3122 }
3123
3124 inline_size void
3125 pri_adjust (EV_P_ W w)
3126 {
3127 int pri = ev_priority (w);
3128 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3129 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3130 ev_set_priority (w, pri);
3131 }
3132
3133 inline_speed void
3134 ev_start (EV_P_ W w, int active)
3135 {
3136 pri_adjust (EV_A_ w);
3137 w->active = active;
3138 ev_ref (EV_A);
3139 }
3140
3141 inline_size void
3142 ev_stop (EV_P_ W w)
3143 {
3144 ev_unref (EV_A);
3145 w->active = 0;
3146 }
3147
3148 /*****************************************************************************/
3149
3150 void noinline
3151 ev_io_start (EV_P_ ev_io *w)
3152 {
3153 int fd = w->fd;
3154
3155 if (expect_false (ev_is_active (w)))
3156 return;
3157
3158 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3159 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3160
3161 EV_FREQUENT_CHECK;
3162
3163 ev_start (EV_A_ (W)w, 1);
3164 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3165 wlist_add (&anfds[fd].head, (WL)w);
3166
3167 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3168 w->events &= ~EV__IOFDSET;
3169
3170 EV_FREQUENT_CHECK;
3171 }
3172
3173 void noinline
3174 ev_io_stop (EV_P_ ev_io *w)
3175 {
3176 clear_pending (EV_A_ (W)w);
3177 if (expect_false (!ev_is_active (w)))
3178 return;
3179
3180 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3181
3182 EV_FREQUENT_CHECK;
3183
3184 wlist_del (&anfds[w->fd].head, (WL)w);
3185 ev_stop (EV_A_ (W)w);
3186
3187 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3188
3189 EV_FREQUENT_CHECK;
3190 }
3191
3192 void noinline
3193 ev_timer_start (EV_P_ ev_timer *w)
3194 {
3195 if (expect_false (ev_is_active (w)))
3196 return;
3197
3198 ev_at (w) += mn_now;
3199
3200 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3201
3202 EV_FREQUENT_CHECK;
3203
3204 ++timercnt;
3205 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3206 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3207 ANHE_w (timers [ev_active (w)]) = (WT)w;
3208 ANHE_at_cache (timers [ev_active (w)]);
3209 upheap (timers, ev_active (w));
3210
3211 EV_FREQUENT_CHECK;
3212
3213 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3214 }
3215
3216 void noinline
3217 ev_timer_stop (EV_P_ ev_timer *w)
3218 {
3219 clear_pending (EV_A_ (W)w);
3220 if (expect_false (!ev_is_active (w)))
3221 return;
3222
3223 EV_FREQUENT_CHECK;
3224
3225 {
3226 int active = ev_active (w);
3227
3228 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3229
3230 --timercnt;
3231
3232 if (expect_true (active < timercnt + HEAP0))
3233 {
3234 timers [active] = timers [timercnt + HEAP0];
3235 adjustheap (timers, timercnt, active);
3236 }
3237 }
3238
3239 ev_at (w) -= mn_now;
3240
3241 ev_stop (EV_A_ (W)w);
3242
3243 EV_FREQUENT_CHECK;
3244 }
3245
3246 void noinline
3247 ev_timer_again (EV_P_ ev_timer *w)
3248 {
3249 EV_FREQUENT_CHECK;
3250
3251 if (ev_is_active (w))
3252 {
3253 if (w->repeat)
3254 {
3255 ev_at (w) = mn_now + w->repeat;
3256 ANHE_at_cache (timers [ev_active (w)]);
3257 adjustheap (timers, timercnt, ev_active (w));
3258 }
3259 else
3260 ev_timer_stop (EV_A_ w);
3261 }
3262 else if (w->repeat)
3263 {
3264 ev_at (w) = w->repeat;
3265 ev_timer_start (EV_A_ w);
3266 }
3267
3268 EV_FREQUENT_CHECK;
3269 }
3270
3271 ev_tstamp
3272 ev_timer_remaining (EV_P_ ev_timer *w)
3273 {
3274 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3275 }
3276
3277 #if EV_PERIODIC_ENABLE
3278 void noinline
3279 ev_periodic_start (EV_P_ ev_periodic *w)
3280 {
3281 if (expect_false (ev_is_active (w)))
3282 return;
3283
3284 if (w->reschedule_cb)
3285 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3286 else if (w->interval)
3287 {
3288 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3289 periodic_recalc (EV_A_ w);
3290 }
3291 else
3292 ev_at (w) = w->offset;
3293
3294 EV_FREQUENT_CHECK;
3295
3296 ++periodiccnt;
3297 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3298 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3299 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3300 ANHE_at_cache (periodics [ev_active (w)]);
3301 upheap (periodics, ev_active (w));
3302
3303 EV_FREQUENT_CHECK;
3304
3305 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3306 }
3307
3308 void noinline
3309 ev_periodic_stop (EV_P_ ev_periodic *w)
3310 {
3311 clear_pending (EV_A_ (W)w);
3312 if (expect_false (!ev_is_active (w)))
3313 return;
3314
3315 EV_FREQUENT_CHECK;
3316
3317 {
3318 int active = ev_active (w);
3319
3320 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3321
3322 --periodiccnt;
3323
3324 if (expect_true (active < periodiccnt + HEAP0))
3325 {
3326 periodics [active] = periodics [periodiccnt + HEAP0];
3327 adjustheap (periodics, periodiccnt, active);
3328 }
3329 }
3330
3331 ev_stop (EV_A_ (W)w);
3332
3333 EV_FREQUENT_CHECK;
3334 }
3335
3336 void noinline
3337 ev_periodic_again (EV_P_ ev_periodic *w)
3338 {
3339 /* TODO: use adjustheap and recalculation */
3340 ev_periodic_stop (EV_A_ w);
3341 ev_periodic_start (EV_A_ w);
3342 }
3343 #endif
3344
3345 #ifndef SA_RESTART
3346 # define SA_RESTART 0
3347 #endif
3348
3349 #if EV_SIGNAL_ENABLE
3350
3351 void noinline
3352 ev_signal_start (EV_P_ ev_signal *w)
3353 {
3354 if (expect_false (ev_is_active (w)))
3355 return;
3356
3357 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3358
3359 #if EV_MULTIPLICITY
3360 assert (("libev: a signal must not be attached to two different loops",
3361 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3362
3363 signals [w->signum - 1].loop = EV_A;
3364 #endif
3365
3366 EV_FREQUENT_CHECK;
3367
3368 #if EV_USE_SIGNALFD
3369 if (sigfd == -2)
3370 {
3371 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3372 if (sigfd < 0 && errno == EINVAL)
3373 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3374
3375 if (sigfd >= 0)
3376 {
3377 fd_intern (sigfd); /* doing it twice will not hurt */
3378
3379 sigemptyset (&sigfd_set);
3380
3381 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3382 ev_set_priority (&sigfd_w, EV_MAXPRI);
3383 ev_io_start (EV_A_ &sigfd_w);
3384 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3385 }
3386 }
3387
3388 if (sigfd >= 0)
3389 {
3390 /* TODO: check .head */
3391 sigaddset (&sigfd_set, w->signum);
3392 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3393
3394 signalfd (sigfd, &sigfd_set, 0);
3395 }
3396 #endif
3397
3398 ev_start (EV_A_ (W)w, 1);
3399 wlist_add (&signals [w->signum - 1].head, (WL)w);
3400
3401 if (!((WL)w)->next)
3402 # if EV_USE_SIGNALFD
3403 if (sigfd < 0) /*TODO*/
3404 # endif
3405 {
3406 # ifdef _WIN32
3407 evpipe_init (EV_A);
3408
3409 signal (w->signum, ev_sighandler);
3410 # else
3411 struct sigaction sa;
3412
3413 evpipe_init (EV_A);
3414
3415 sa.sa_handler = ev_sighandler;
3416 sigfillset (&sa.sa_mask);
3417 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3418 sigaction (w->signum, &sa, 0);
3419
3420 if (origflags & EVFLAG_NOSIGMASK)
3421 {
3422 sigemptyset (&sa.sa_mask);
3423 sigaddset (&sa.sa_mask, w->signum);
3424 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3425 }
3426 #endif
3427 }
3428
3429 EV_FREQUENT_CHECK;
3430 }
3431
3432 void noinline
3433 ev_signal_stop (EV_P_ ev_signal *w)
3434 {
3435 clear_pending (EV_A_ (W)w);
3436 if (expect_false (!ev_is_active (w)))
3437 return;
3438
3439 EV_FREQUENT_CHECK;
3440
3441 wlist_del (&signals [w->signum - 1].head, (WL)w);
3442 ev_stop (EV_A_ (W)w);
3443
3444 if (!signals [w->signum - 1].head)
3445 {
3446 #if EV_MULTIPLICITY
3447 signals [w->signum - 1].loop = 0; /* unattach from signal */
3448 #endif
3449 #if EV_USE_SIGNALFD
3450 if (sigfd >= 0)
3451 {
3452 sigset_t ss;
3453
3454 sigemptyset (&ss);
3455 sigaddset (&ss, w->signum);
3456 sigdelset (&sigfd_set, w->signum);
3457
3458 signalfd (sigfd, &sigfd_set, 0);
3459 sigprocmask (SIG_UNBLOCK, &ss, 0);
3460 }
3461 else
3462 #endif
3463 signal (w->signum, SIG_DFL);
3464 }
3465
3466 EV_FREQUENT_CHECK;
3467 }
3468
3469 #endif
3470
3471 #if EV_CHILD_ENABLE
3472
3473 void
3474 ev_child_start (EV_P_ ev_child *w)
3475 {
3476 #if EV_MULTIPLICITY
3477 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3478 #endif
3479 if (expect_false (ev_is_active (w)))
3480 return;
3481
3482 EV_FREQUENT_CHECK;
3483
3484 ev_start (EV_A_ (W)w, 1);
3485 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3486
3487 EV_FREQUENT_CHECK;
3488 }
3489
3490 void
3491 ev_child_stop (EV_P_ ev_child *w)
3492 {
3493 clear_pending (EV_A_ (W)w);
3494 if (expect_false (!ev_is_active (w)))
3495 return;
3496
3497 EV_FREQUENT_CHECK;
3498
3499 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3500 ev_stop (EV_A_ (W)w);
3501
3502 EV_FREQUENT_CHECK;
3503 }
3504
3505 #endif
3506
3507 #if EV_STAT_ENABLE
3508
3509 # ifdef _WIN32
3510 # undef lstat
3511 # define lstat(a,b) _stati64 (a,b)
3512 # endif
3513
3514 #define DEF_STAT_INTERVAL 5.0074891
3515 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3516 #define MIN_STAT_INTERVAL 0.1074891
3517
3518 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3519
3520 #if EV_USE_INOTIFY
3521
3522 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3523 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3524
3525 static void noinline
3526 infy_add (EV_P_ ev_stat *w)
3527 {
3528 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);
3529
3530 if (w->wd >= 0)
3531 {
3532 struct statfs sfs;
3533
3534 /* now local changes will be tracked by inotify, but remote changes won't */
3535 /* unless the filesystem is known to be local, we therefore still poll */
3536 /* also do poll on <2.6.25, but with normal frequency */
3537
3538 if (!fs_2625)
3539 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3540 else if (!statfs (w->path, &sfs)
3541 && (sfs.f_type == 0x1373 /* devfs */
3542 || sfs.f_type == 0xEF53 /* ext2/3 */
3543 || sfs.f_type == 0x3153464a /* jfs */
3544 || sfs.f_type == 0x52654973 /* reiser3 */
3545 || sfs.f_type == 0x01021994 /* tempfs */
3546 || sfs.f_type == 0x58465342 /* xfs */))
3547 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3548 else
3549 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3550 }
3551 else
3552 {
3553 /* can't use inotify, continue to stat */
3554 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3555
3556 /* if path is not there, monitor some parent directory for speedup hints */
3557 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3558 /* but an efficiency issue only */
3559 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3560 {
3561 char path [4096];
3562 strcpy (path, w->path);
3563
3564 do
3565 {
3566 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3567 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3568
3569 char *pend = strrchr (path, '/');
3570
3571 if (!pend || pend == path)
3572 break;
3573
3574 *pend = 0;
3575 w->wd = inotify_add_watch (fs_fd, path, mask);
3576 }
3577 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3578 }
3579 }
3580
3581 if (w->wd >= 0)
3582 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3583
3584 /* now re-arm timer, if required */
3585 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3586 ev_timer_again (EV_A_ &w->timer);
3587 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3588 }
3589
3590 static void noinline
3591 infy_del (EV_P_ ev_stat *w)
3592 {
3593 int slot;
3594 int wd = w->wd;
3595
3596 if (wd < 0)
3597 return;
3598
3599 w->wd = -2;
3600 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3601 wlist_del (&fs_hash [slot].head, (WL)w);
3602
3603 /* remove this watcher, if others are watching it, they will rearm */
3604 inotify_rm_watch (fs_fd, wd);
3605 }
3606
3607 static void noinline
3608 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3609 {
3610 if (slot < 0)
3611 /* overflow, need to check for all hash slots */
3612 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3613 infy_wd (EV_A_ slot, wd, ev);
3614 else
3615 {
3616 WL w_;
3617
3618 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3619 {
3620 ev_stat *w = (ev_stat *)w_;
3621 w_ = w_->next; /* lets us remove this watcher and all before it */
3622
3623 if (w->wd == wd || wd == -1)
3624 {
3625 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3626 {
3627 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3628 w->wd = -1;
3629 infy_add (EV_A_ w); /* re-add, no matter what */
3630 }
3631
3632 stat_timer_cb (EV_A_ &w->timer, 0);
3633 }
3634 }
3635 }
3636 }
3637
3638 static void
3639 infy_cb (EV_P_ ev_io *w, int revents)
3640 {
3641 char buf [EV_INOTIFY_BUFSIZE];
3642 int ofs;
3643 int len = read (fs_fd, buf, sizeof (buf));
3644
3645 for (ofs = 0; ofs < len; )
3646 {
3647 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3648 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3649 ofs += sizeof (struct inotify_event) + ev->len;
3650 }
3651 }
3652
3653 inline_size void ecb_cold
3654 ev_check_2625 (EV_P)
3655 {
3656 /* kernels < 2.6.25 are borked
3657 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3658 */
3659 if (ev_linux_version () < 0x020619)
3660 return;
3661
3662 fs_2625 = 1;
3663 }
3664
3665 inline_size int
3666 infy_newfd (void)
3667 {
3668 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3669 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3670 if (fd >= 0)
3671 return fd;
3672 #endif
3673 return inotify_init ();
3674 }
3675
3676 inline_size void
3677 infy_init (EV_P)
3678 {
3679 if (fs_fd != -2)
3680 return;
3681
3682 fs_fd = -1;
3683
3684 ev_check_2625 (EV_A);
3685
3686 fs_fd = infy_newfd ();
3687
3688 if (fs_fd >= 0)
3689 {
3690 fd_intern (fs_fd);
3691 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3692 ev_set_priority (&fs_w, EV_MAXPRI);
3693 ev_io_start (EV_A_ &fs_w);
3694 ev_unref (EV_A);
3695 }
3696 }
3697
3698 inline_size void
3699 infy_fork (EV_P)
3700 {
3701 int slot;
3702
3703 if (fs_fd < 0)
3704 return;
3705
3706 ev_ref (EV_A);
3707 ev_io_stop (EV_A_ &fs_w);
3708 close (fs_fd);
3709 fs_fd = infy_newfd ();
3710
3711 if (fs_fd >= 0)
3712 {
3713 fd_intern (fs_fd);
3714 ev_io_set (&fs_w, fs_fd, EV_READ);
3715 ev_io_start (EV_A_ &fs_w);
3716 ev_unref (EV_A);
3717 }
3718
3719 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3720 {
3721 WL w_ = fs_hash [slot].head;
3722 fs_hash [slot].head = 0;
3723
3724 while (w_)
3725 {
3726 ev_stat *w = (ev_stat *)w_;
3727 w_ = w_->next; /* lets us add this watcher */
3728
3729 w->wd = -1;
3730
3731 if (fs_fd >= 0)
3732 infy_add (EV_A_ w); /* re-add, no matter what */
3733 else
3734 {
3735 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3736 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3737 ev_timer_again (EV_A_ &w->timer);
3738 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3739 }
3740 }
3741 }
3742 }
3743
3744 #endif
3745
3746 #ifdef _WIN32
3747 # define EV_LSTAT(p,b) _stati64 (p, b)
3748 #else
3749 # define EV_LSTAT(p,b) lstat (p, b)
3750 #endif
3751
3752 void
3753 ev_stat_stat (EV_P_ ev_stat *w)
3754 {
3755 if (lstat (w->path, &w->attr) < 0)
3756 w->attr.st_nlink = 0;
3757 else if (!w->attr.st_nlink)
3758 w->attr.st_nlink = 1;
3759 }
3760
3761 static void noinline
3762 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3763 {
3764 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3765
3766 ev_statdata prev = w->attr;
3767 ev_stat_stat (EV_A_ w);
3768
3769 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3770 if (
3771 prev.st_dev != w->attr.st_dev
3772 || prev.st_ino != w->attr.st_ino
3773 || prev.st_mode != w->attr.st_mode
3774 || prev.st_nlink != w->attr.st_nlink
3775 || prev.st_uid != w->attr.st_uid
3776 || prev.st_gid != w->attr.st_gid
3777 || prev.st_rdev != w->attr.st_rdev
3778 || prev.st_size != w->attr.st_size
3779 || prev.st_atime != w->attr.st_atime
3780 || prev.st_mtime != w->attr.st_mtime
3781 || prev.st_ctime != w->attr.st_ctime
3782 ) {
3783 /* we only update w->prev on actual differences */
3784 /* in case we test more often than invoke the callback, */
3785 /* to ensure that prev is always different to attr */
3786 w->prev = prev;
3787
3788 #if EV_USE_INOTIFY
3789 if (fs_fd >= 0)
3790 {
3791 infy_del (EV_A_ w);
3792 infy_add (EV_A_ w);
3793 ev_stat_stat (EV_A_ w); /* avoid race... */
3794 }
3795 #endif
3796
3797 ev_feed_event (EV_A_ w, EV_STAT);
3798 }
3799 }
3800
3801 void
3802 ev_stat_start (EV_P_ ev_stat *w)
3803 {
3804 if (expect_false (ev_is_active (w)))
3805 return;
3806
3807 ev_stat_stat (EV_A_ w);
3808
3809 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3810 w->interval = MIN_STAT_INTERVAL;
3811
3812 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3813 ev_set_priority (&w->timer, ev_priority (w));
3814
3815 #if EV_USE_INOTIFY
3816 infy_init (EV_A);
3817
3818 if (fs_fd >= 0)
3819 infy_add (EV_A_ w);
3820 else
3821 #endif
3822 {
3823 ev_timer_again (EV_A_ &w->timer);
3824 ev_unref (EV_A);
3825 }
3826
3827 ev_start (EV_A_ (W)w, 1);
3828
3829 EV_FREQUENT_CHECK;
3830 }
3831
3832 void
3833 ev_stat_stop (EV_P_ ev_stat *w)
3834 {
3835 clear_pending (EV_A_ (W)w);
3836 if (expect_false (!ev_is_active (w)))
3837 return;
3838
3839 EV_FREQUENT_CHECK;
3840
3841 #if EV_USE_INOTIFY
3842 infy_del (EV_A_ w);
3843 #endif
3844
3845 if (ev_is_active (&w->timer))
3846 {
3847 ev_ref (EV_A);
3848 ev_timer_stop (EV_A_ &w->timer);
3849 }
3850
3851 ev_stop (EV_A_ (W)w);
3852
3853 EV_FREQUENT_CHECK;
3854 }
3855 #endif
3856
3857 #if EV_IDLE_ENABLE
3858 void
3859 ev_idle_start (EV_P_ ev_idle *w)
3860 {
3861 if (expect_false (ev_is_active (w)))
3862 return;
3863
3864 pri_adjust (EV_A_ (W)w);
3865
3866 EV_FREQUENT_CHECK;
3867
3868 {
3869 int active = ++idlecnt [ABSPRI (w)];
3870
3871 ++idleall;
3872 ev_start (EV_A_ (W)w, active);
3873
3874 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3875 idles [ABSPRI (w)][active - 1] = w;
3876 }
3877
3878 EV_FREQUENT_CHECK;
3879 }
3880
3881 void
3882 ev_idle_stop (EV_P_ ev_idle *w)
3883 {
3884 clear_pending (EV_A_ (W)w);
3885 if (expect_false (!ev_is_active (w)))
3886 return;
3887
3888 EV_FREQUENT_CHECK;
3889
3890 {
3891 int active = ev_active (w);
3892
3893 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3894 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3895
3896 ev_stop (EV_A_ (W)w);
3897 --idleall;
3898 }
3899
3900 EV_FREQUENT_CHECK;
3901 }
3902 #endif
3903
3904 #if EV_PREPARE_ENABLE
3905 void
3906 ev_prepare_start (EV_P_ ev_prepare *w)
3907 {
3908 if (expect_false (ev_is_active (w)))
3909 return;
3910
3911 EV_FREQUENT_CHECK;
3912
3913 ev_start (EV_A_ (W)w, ++preparecnt);
3914 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3915 prepares [preparecnt - 1] = w;
3916
3917 EV_FREQUENT_CHECK;
3918 }
3919
3920 void
3921 ev_prepare_stop (EV_P_ ev_prepare *w)
3922 {
3923 clear_pending (EV_A_ (W)w);
3924 if (expect_false (!ev_is_active (w)))
3925 return;
3926
3927 EV_FREQUENT_CHECK;
3928
3929 {
3930 int active = ev_active (w);
3931
3932 prepares [active - 1] = prepares [--preparecnt];
3933 ev_active (prepares [active - 1]) = active;
3934 }
3935
3936 ev_stop (EV_A_ (W)w);
3937
3938 EV_FREQUENT_CHECK;
3939 }
3940 #endif
3941
3942 #if EV_CHECK_ENABLE
3943 void
3944 ev_check_start (EV_P_ ev_check *w)
3945 {
3946 if (expect_false (ev_is_active (w)))
3947 return;
3948
3949 EV_FREQUENT_CHECK;
3950
3951 ev_start (EV_A_ (W)w, ++checkcnt);
3952 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3953 checks [checkcnt - 1] = w;
3954
3955 EV_FREQUENT_CHECK;
3956 }
3957
3958 void
3959 ev_check_stop (EV_P_ ev_check *w)
3960 {
3961 clear_pending (EV_A_ (W)w);
3962 if (expect_false (!ev_is_active (w)))
3963 return;
3964
3965 EV_FREQUENT_CHECK;
3966
3967 {
3968 int active = ev_active (w);
3969
3970 checks [active - 1] = checks [--checkcnt];
3971 ev_active (checks [active - 1]) = active;
3972 }
3973
3974 ev_stop (EV_A_ (W)w);
3975
3976 EV_FREQUENT_CHECK;
3977 }
3978 #endif
3979
3980 #if EV_EMBED_ENABLE
3981 void noinline
3982 ev_embed_sweep (EV_P_ ev_embed *w)
3983 {
3984 ev_run (w->other, EVRUN_NOWAIT);
3985 }
3986
3987 static void
3988 embed_io_cb (EV_P_ ev_io *io, int revents)
3989 {
3990 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3991
3992 if (ev_cb (w))
3993 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3994 else
3995 ev_run (w->other, EVRUN_NOWAIT);
3996 }
3997
3998 static void
3999 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4000 {
4001 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4002
4003 {
4004 EV_P = w->other;
4005
4006 while (fdchangecnt)
4007 {
4008 fd_reify (EV_A);
4009 ev_run (EV_A_ EVRUN_NOWAIT);
4010 }
4011 }
4012 }
4013
4014 static void
4015 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4016 {
4017 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4018
4019 ev_embed_stop (EV_A_ w);
4020
4021 {
4022 EV_P = w->other;
4023
4024 ev_loop_fork (EV_A);
4025 ev_run (EV_A_ EVRUN_NOWAIT);
4026 }
4027
4028 ev_embed_start (EV_A_ w);
4029 }
4030
4031 #if 0
4032 static void
4033 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4034 {
4035 ev_idle_stop (EV_A_ idle);
4036 }
4037 #endif
4038
4039 void
4040 ev_embed_start (EV_P_ ev_embed *w)
4041 {
4042 if (expect_false (ev_is_active (w)))
4043 return;
4044
4045 {
4046 EV_P = w->other;
4047 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4048 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4049 }
4050
4051 EV_FREQUENT_CHECK;
4052
4053 ev_set_priority (&w->io, ev_priority (w));
4054 ev_io_start (EV_A_ &w->io);
4055
4056 ev_prepare_init (&w->prepare, embed_prepare_cb);
4057 ev_set_priority (&w->prepare, EV_MINPRI);
4058 ev_prepare_start (EV_A_ &w->prepare);
4059
4060 ev_fork_init (&w->fork, embed_fork_cb);
4061 ev_fork_start (EV_A_ &w->fork);
4062
4063 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4064
4065 ev_start (EV_A_ (W)w, 1);
4066
4067 EV_FREQUENT_CHECK;
4068 }
4069
4070 void
4071 ev_embed_stop (EV_P_ ev_embed *w)
4072 {
4073 clear_pending (EV_A_ (W)w);
4074 if (expect_false (!ev_is_active (w)))
4075 return;
4076
4077 EV_FREQUENT_CHECK;
4078
4079 ev_io_stop (EV_A_ &w->io);
4080 ev_prepare_stop (EV_A_ &w->prepare);
4081 ev_fork_stop (EV_A_ &w->fork);
4082
4083 ev_stop (EV_A_ (W)w);
4084
4085 EV_FREQUENT_CHECK;
4086 }
4087 #endif
4088
4089 #if EV_FORK_ENABLE
4090 void
4091 ev_fork_start (EV_P_ ev_fork *w)
4092 {
4093 if (expect_false (ev_is_active (w)))
4094 return;
4095
4096 EV_FREQUENT_CHECK;
4097
4098 ev_start (EV_A_ (W)w, ++forkcnt);
4099 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4100 forks [forkcnt - 1] = w;
4101
4102 EV_FREQUENT_CHECK;
4103 }
4104
4105 void
4106 ev_fork_stop (EV_P_ ev_fork *w)
4107 {
4108 clear_pending (EV_A_ (W)w);
4109 if (expect_false (!ev_is_active (w)))
4110 return;
4111
4112 EV_FREQUENT_CHECK;
4113
4114 {
4115 int active = ev_active (w);
4116
4117 forks [active - 1] = forks [--forkcnt];
4118 ev_active (forks [active - 1]) = active;
4119 }
4120
4121 ev_stop (EV_A_ (W)w);
4122
4123 EV_FREQUENT_CHECK;
4124 }
4125 #endif
4126
4127 #if EV_CLEANUP_ENABLE
4128 void
4129 ev_cleanup_start (EV_P_ ev_cleanup *w)
4130 {
4131 if (expect_false (ev_is_active (w)))
4132 return;
4133
4134 EV_FREQUENT_CHECK;
4135
4136 ev_start (EV_A_ (W)w, ++cleanupcnt);
4137 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4138 cleanups [cleanupcnt - 1] = w;
4139
4140 /* cleanup watchers should never keep a refcount on the loop */
4141 ev_unref (EV_A);
4142 EV_FREQUENT_CHECK;
4143 }
4144
4145 void
4146 ev_cleanup_stop (EV_P_ ev_cleanup *w)
4147 {
4148 clear_pending (EV_A_ (W)w);
4149 if (expect_false (!ev_is_active (w)))
4150 return;
4151
4152 EV_FREQUENT_CHECK;
4153 ev_ref (EV_A);
4154
4155 {
4156 int active = ev_active (w);
4157
4158 cleanups [active - 1] = cleanups [--cleanupcnt];
4159 ev_active (cleanups [active - 1]) = active;
4160 }
4161
4162 ev_stop (EV_A_ (W)w);
4163
4164 EV_FREQUENT_CHECK;
4165 }
4166 #endif
4167
4168 #if EV_ASYNC_ENABLE
4169 void
4170 ev_async_start (EV_P_ ev_async *w)
4171 {
4172 if (expect_false (ev_is_active (w)))
4173 return;
4174
4175 w->sent = 0;
4176
4177 evpipe_init (EV_A);
4178
4179 EV_FREQUENT_CHECK;
4180
4181 ev_start (EV_A_ (W)w, ++asynccnt);
4182 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4183 asyncs [asynccnt - 1] = w;
4184
4185 EV_FREQUENT_CHECK;
4186 }
4187
4188 void
4189 ev_async_stop (EV_P_ ev_async *w)
4190 {
4191 clear_pending (EV_A_ (W)w);
4192 if (expect_false (!ev_is_active (w)))
4193 return;
4194
4195 EV_FREQUENT_CHECK;
4196
4197 {
4198 int active = ev_active (w);
4199
4200 asyncs [active - 1] = asyncs [--asynccnt];
4201 ev_active (asyncs [active - 1]) = active;
4202 }
4203
4204 ev_stop (EV_A_ (W)w);
4205
4206 EV_FREQUENT_CHECK;
4207 }
4208
4209 void
4210 ev_async_send (EV_P_ ev_async *w)
4211 {
4212 w->sent = 1;
4213 evpipe_write (EV_A_ &async_pending);
4214 }
4215 #endif
4216
4217 /*****************************************************************************/
4218
4219 struct ev_once
4220 {
4221 ev_io io;
4222 ev_timer to;
4223 void (*cb)(int revents, void *arg);
4224 void *arg;
4225 };
4226
4227 static void
4228 once_cb (EV_P_ struct ev_once *once, int revents)
4229 {
4230 void (*cb)(int revents, void *arg) = once->cb;
4231 void *arg = once->arg;
4232
4233 ev_io_stop (EV_A_ &once->io);
4234 ev_timer_stop (EV_A_ &once->to);
4235 ev_free (once);
4236
4237 cb (revents, arg);
4238 }
4239
4240 static void
4241 once_cb_io (EV_P_ ev_io *w, int revents)
4242 {
4243 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4244
4245 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4246 }
4247
4248 static void
4249 once_cb_to (EV_P_ ev_timer *w, int revents)
4250 {
4251 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4252
4253 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4254 }
4255
4256 void
4257 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
4258 {
4259 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4260
4261 if (expect_false (!once))
4262 {
4263 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4264 return;
4265 }
4266
4267 once->cb = cb;
4268 once->arg = arg;
4269
4270 ev_init (&once->io, once_cb_io);
4271 if (fd >= 0)
4272 {
4273 ev_io_set (&once->io, fd, events);
4274 ev_io_start (EV_A_ &once->io);
4275 }
4276
4277 ev_init (&once->to, once_cb_to);
4278 if (timeout >= 0.)
4279 {
4280 ev_timer_set (&once->to, timeout, 0.);
4281 ev_timer_start (EV_A_ &once->to);
4282 }
4283 }
4284
4285 /*****************************************************************************/
4286
4287 #if EV_WALK_ENABLE
4288 void ecb_cold
4289 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
4290 {
4291 int i, j;
4292 ev_watcher_list *wl, *wn;
4293
4294 if (types & (EV_IO | EV_EMBED))
4295 for (i = 0; i < anfdmax; ++i)
4296 for (wl = anfds [i].head; wl; )
4297 {
4298 wn = wl->next;
4299
4300 #if EV_EMBED_ENABLE
4301 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4302 {
4303 if (types & EV_EMBED)
4304 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4305 }
4306 else
4307 #endif
4308 #if EV_USE_INOTIFY
4309 if (ev_cb ((ev_io *)wl) == infy_cb)
4310 ;
4311 else
4312 #endif
4313 if ((ev_io *)wl != &pipe_w)
4314 if (types & EV_IO)
4315 cb (EV_A_ EV_IO, wl);
4316
4317 wl = wn;
4318 }
4319
4320 if (types & (EV_TIMER | EV_STAT))
4321 for (i = timercnt + HEAP0; i-- > HEAP0; )
4322 #if EV_STAT_ENABLE
4323 /*TODO: timer is not always active*/
4324 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
4325 {
4326 if (types & EV_STAT)
4327 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
4328 }
4329 else
4330 #endif
4331 if (types & EV_TIMER)
4332 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
4333
4334 #if EV_PERIODIC_ENABLE
4335 if (types & EV_PERIODIC)
4336 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4337 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4338 #endif
4339
4340 #if EV_IDLE_ENABLE
4341 if (types & EV_IDLE)
4342 for (j = NUMPRI; j--; )
4343 for (i = idlecnt [j]; i--; )
4344 cb (EV_A_ EV_IDLE, idles [j][i]);
4345 #endif
4346
4347 #if EV_FORK_ENABLE
4348 if (types & EV_FORK)
4349 for (i = forkcnt; i--; )
4350 if (ev_cb (forks [i]) != embed_fork_cb)
4351 cb (EV_A_ EV_FORK, forks [i]);
4352 #endif
4353
4354 #if EV_ASYNC_ENABLE
4355 if (types & EV_ASYNC)
4356 for (i = asynccnt; i--; )
4357 cb (EV_A_ EV_ASYNC, asyncs [i]);
4358 #endif
4359
4360 #if EV_PREPARE_ENABLE
4361 if (types & EV_PREPARE)
4362 for (i = preparecnt; i--; )
4363 # if EV_EMBED_ENABLE
4364 if (ev_cb (prepares [i]) != embed_prepare_cb)
4365 # endif
4366 cb (EV_A_ EV_PREPARE, prepares [i]);
4367 #endif
4368
4369 #if EV_CHECK_ENABLE
4370 if (types & EV_CHECK)
4371 for (i = checkcnt; i--; )
4372 cb (EV_A_ EV_CHECK, checks [i]);
4373 #endif
4374
4375 #if EV_SIGNAL_ENABLE
4376 if (types & EV_SIGNAL)
4377 for (i = 0; i < EV_NSIG - 1; ++i)
4378 for (wl = signals [i].head; wl; )
4379 {
4380 wn = wl->next;
4381 cb (EV_A_ EV_SIGNAL, wl);
4382 wl = wn;
4383 }
4384 #endif
4385
4386 #if EV_CHILD_ENABLE
4387 if (types & EV_CHILD)
4388 for (i = (EV_PID_HASHSIZE); i--; )
4389 for (wl = childs [i]; wl; )
4390 {
4391 wn = wl->next;
4392 cb (EV_A_ EV_CHILD, wl);
4393 wl = wn;
4394 }
4395 #endif
4396 /* EV_STAT 0x00001000 /* stat data changed */
4397 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4398 }
4399 #endif
4400
4401 #if EV_MULTIPLICITY
4402 #include "ev_wrap.h"
4403 #endif
4404
4405 EV_CPP(})
4406