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/cvs/libev/ev.c
Revision: 1.403
Committed: Wed Jan 18 12:13:14 2012 UTC (12 years, 6 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.402: +41 -2 lines
Log Message:
sun studio and sparc support

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 #ifndef _WIN32
189 # include <sys/time.h>
190 # include <sys/wait.h>
191 # include <unistd.h>
192 #else
193 # include <io.h>
194 # define WIN32_LEAN_AND_MEAN
195 # include <windows.h>
196 # ifndef EV_SELECT_IS_WINSOCKET
197 # define EV_SELECT_IS_WINSOCKET 1
198 # endif
199 # undef EV_AVOID_STDIO
200 #endif
201
202 /* OS X, in its infinite idiocy, actually HARDCODES
203 * a limit of 1024 into their select. Where people have brains,
204 * OS X engineers apparently have a vacuum. Or maybe they were
205 * ordered to have a vacuum, or they do anything for money.
206 * This might help. Or not.
207 */
208 #define _DARWIN_UNLIMITED_SELECT 1
209
210 /* this block tries to deduce configuration from header-defined symbols and defaults */
211
212 /* try to deduce the maximum number of signals on this platform */
213 #if defined (EV_NSIG)
214 /* use what's provided */
215 #elif defined (NSIG)
216 # define EV_NSIG (NSIG)
217 #elif defined(_NSIG)
218 # define EV_NSIG (_NSIG)
219 #elif defined (SIGMAX)
220 # define EV_NSIG (SIGMAX+1)
221 #elif defined (SIG_MAX)
222 # define EV_NSIG (SIG_MAX+1)
223 #elif defined (_SIG_MAX)
224 # define EV_NSIG (_SIG_MAX+1)
225 #elif defined (MAXSIG)
226 # define EV_NSIG (MAXSIG+1)
227 #elif defined (MAX_SIG)
228 # define EV_NSIG (MAX_SIG+1)
229 #elif defined (SIGARRAYSIZE)
230 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
231 #elif defined (_sys_nsig)
232 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
233 #else
234 # error "unable to find value for NSIG, please report"
235 /* to make it compile regardless, just remove the above line, */
236 /* but consider reporting it, too! :) */
237 # define EV_NSIG 65
238 #endif
239
240 #ifndef EV_USE_FLOOR
241 # define EV_USE_FLOOR 0
242 #endif
243
244 #ifndef EV_USE_CLOCK_SYSCALL
245 # if __linux && __GLIBC__ >= 2
246 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
247 # else
248 # define EV_USE_CLOCK_SYSCALL 0
249 # endif
250 #endif
251
252 #ifndef EV_USE_MONOTONIC
253 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
254 # define EV_USE_MONOTONIC EV_FEATURE_OS
255 # else
256 # define EV_USE_MONOTONIC 0
257 # endif
258 #endif
259
260 #ifndef EV_USE_REALTIME
261 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
262 #endif
263
264 #ifndef EV_USE_NANOSLEEP
265 # if _POSIX_C_SOURCE >= 199309L
266 # define EV_USE_NANOSLEEP EV_FEATURE_OS
267 # else
268 # define EV_USE_NANOSLEEP 0
269 # endif
270 #endif
271
272 #ifndef EV_USE_SELECT
273 # define EV_USE_SELECT EV_FEATURE_BACKENDS
274 #endif
275
276 #ifndef EV_USE_POLL
277 # ifdef _WIN32
278 # define EV_USE_POLL 0
279 # else
280 # define EV_USE_POLL EV_FEATURE_BACKENDS
281 # endif
282 #endif
283
284 #ifndef EV_USE_EPOLL
285 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
286 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
287 # else
288 # define EV_USE_EPOLL 0
289 # endif
290 #endif
291
292 #ifndef EV_USE_KQUEUE
293 # define EV_USE_KQUEUE 0
294 #endif
295
296 #ifndef EV_USE_PORT
297 # define EV_USE_PORT 0
298 #endif
299
300 #ifndef EV_USE_INOTIFY
301 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
302 # define EV_USE_INOTIFY EV_FEATURE_OS
303 # else
304 # define EV_USE_INOTIFY 0
305 # endif
306 #endif
307
308 #ifndef EV_PID_HASHSIZE
309 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
310 #endif
311
312 #ifndef EV_INOTIFY_HASHSIZE
313 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
314 #endif
315
316 #ifndef EV_USE_EVENTFD
317 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
318 # define EV_USE_EVENTFD EV_FEATURE_OS
319 # else
320 # define EV_USE_EVENTFD 0
321 # endif
322 #endif
323
324 #ifndef EV_USE_SIGNALFD
325 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
326 # define EV_USE_SIGNALFD EV_FEATURE_OS
327 # else
328 # define EV_USE_SIGNALFD 0
329 # endif
330 #endif
331
332 #if 0 /* debugging */
333 # define EV_VERIFY 3
334 # define EV_USE_4HEAP 1
335 # define EV_HEAP_CACHE_AT 1
336 #endif
337
338 #ifndef EV_VERIFY
339 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
340 #endif
341
342 #ifndef EV_USE_4HEAP
343 # define EV_USE_4HEAP EV_FEATURE_DATA
344 #endif
345
346 #ifndef EV_HEAP_CACHE_AT
347 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
348 #endif
349
350 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
351 /* which makes programs even slower. might work on other unices, too. */
352 #if EV_USE_CLOCK_SYSCALL
353 # include <syscall.h>
354 # ifdef SYS_clock_gettime
355 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
356 # undef EV_USE_MONOTONIC
357 # define EV_USE_MONOTONIC 1
358 # else
359 # undef EV_USE_CLOCK_SYSCALL
360 # define EV_USE_CLOCK_SYSCALL 0
361 # endif
362 #endif
363
364 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
365
366 #ifdef _AIX
367 /* AIX has a completely broken poll.h header */
368 # undef EV_USE_POLL
369 # define EV_USE_POLL 0
370 #endif
371
372 #ifndef CLOCK_MONOTONIC
373 # undef EV_USE_MONOTONIC
374 # define EV_USE_MONOTONIC 0
375 #endif
376
377 #ifndef CLOCK_REALTIME
378 # undef EV_USE_REALTIME
379 # define EV_USE_REALTIME 0
380 #endif
381
382 #if !EV_STAT_ENABLE
383 # undef EV_USE_INOTIFY
384 # define EV_USE_INOTIFY 0
385 #endif
386
387 #if !EV_USE_NANOSLEEP
388 /* hp-ux has it in sys/time.h, which we unconditionally include above */
389 # if !defined(_WIN32) && !defined(__hpux)
390 # include <sys/select.h>
391 # endif
392 #endif
393
394 #if EV_USE_INOTIFY
395 # include <sys/statfs.h>
396 # include <sys/inotify.h>
397 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
398 # ifndef IN_DONT_FOLLOW
399 # undef EV_USE_INOTIFY
400 # define EV_USE_INOTIFY 0
401 # endif
402 #endif
403
404 #if EV_SELECT_IS_WINSOCKET
405 # include <winsock.h>
406 #endif
407
408 #if EV_USE_EVENTFD
409 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
410 # include <stdint.h>
411 # ifndef EFD_NONBLOCK
412 # define EFD_NONBLOCK O_NONBLOCK
413 # endif
414 # ifndef EFD_CLOEXEC
415 # ifdef O_CLOEXEC
416 # define EFD_CLOEXEC O_CLOEXEC
417 # else
418 # define EFD_CLOEXEC 02000000
419 # endif
420 # endif
421 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
422 #endif
423
424 #if EV_USE_SIGNALFD
425 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
426 # include <stdint.h>
427 # ifndef SFD_NONBLOCK
428 # define SFD_NONBLOCK O_NONBLOCK
429 # endif
430 # ifndef SFD_CLOEXEC
431 # ifdef O_CLOEXEC
432 # define SFD_CLOEXEC O_CLOEXEC
433 # else
434 # define SFD_CLOEXEC 02000000
435 # endif
436 # endif
437 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
438
439 struct signalfd_siginfo
440 {
441 uint32_t ssi_signo;
442 char pad[128 - sizeof (uint32_t)];
443 };
444 #endif
445
446 /**/
447
448 #if EV_VERIFY >= 3
449 # define EV_FREQUENT_CHECK ev_verify (EV_A)
450 #else
451 # define EV_FREQUENT_CHECK do { } while (0)
452 #endif
453
454 /*
455 * This is used to work around floating point rounding problems.
456 * This value is good at least till the year 4000.
457 */
458 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
459 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
460
461 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
462 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
463
464 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
465 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
466
467 /* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
468 /* ECB.H BEGIN */
469 /*
470 * libecb - http://software.schmorp.de/pkg/libecb
471 *
472 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
473 * Copyright (©) 2011 Emanuele Giaquinta
474 * All rights reserved.
475 *
476 * Redistribution and use in source and binary forms, with or without modifica-
477 * tion, are permitted provided that the following conditions are met:
478 *
479 * 1. Redistributions of source code must retain the above copyright notice,
480 * this list of conditions and the following disclaimer.
481 *
482 * 2. Redistributions in binary form must reproduce the above copyright
483 * notice, this list of conditions and the following disclaimer in the
484 * documentation and/or other materials provided with the distribution.
485 *
486 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
487 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
488 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
489 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
490 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
491 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
492 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
493 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
494 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
495 * OF THE POSSIBILITY OF SUCH DAMAGE.
496 */
497
498 #ifndef ECB_H
499 #define ECB_H
500
501 #ifdef _WIN32
502 typedef signed char int8_t;
503 typedef unsigned char uint8_t;
504 typedef signed short int16_t;
505 typedef unsigned short uint16_t;
506 typedef signed int int32_t;
507 typedef unsigned int uint32_t;
508 #if __GNUC__
509 typedef signed long long int64_t;
510 typedef unsigned long long uint64_t;
511 #else /* _MSC_VER || __BORLANDC__ */
512 typedef signed __int64 int64_t;
513 typedef unsigned __int64 uint64_t;
514 #endif
515 #else
516 #include <inttypes.h>
517 #endif
518
519 /* many compilers define _GNUC_ to some versions but then only implement
520 * what their idiot authors think are the "more important" extensions,
521 * causing enormous grief in return for some better fake benchmark numbers.
522 * or so.
523 * we try to detect these and simply assume they are not gcc - if they have
524 * an issue with that they should have done it right in the first place.
525 */
526 #ifndef ECB_GCC_VERSION
527 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
528 #define ECB_GCC_VERSION(major,minor) 0
529 #else
530 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
531 #endif
532 #endif
533
534 /*****************************************************************************/
535
536 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
537 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
538
539 #if ECB_NO_THREADS || ECB_NO_SMP
540 #define ECB_MEMORY_FENCE do { } while (0)
541 #endif
542
543 #ifndef ECB_MEMORY_FENCE
544 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || defined(__clang__) || __SUNPRO_C >= 0x5110 || __SUNPRO_xC >= 0x5110
545 #if __i386__
546 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
547 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
548 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
549 #elif __amd64
550 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
551 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
552 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
553 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
554 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
555 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
556 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
557 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
558 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
559 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
560 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
561 #elif defined(__sparc)
562 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #StoreLoad | #LoadLoad | #StoreStore" : : : "memory")
563 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadLoad" : : : "memory")
564 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #StoreStore")
565 #endif
566 #endif
567 #endif
568
569 #ifndef ECB_MEMORY_FENCE
570 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
571 #define ECB_MEMORY_FENCE __sync_synchronize ()
572 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
573 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
574 #elif _MSC_VER >= 1400 /* VC++ 2005 */
575 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
576 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
577 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
578 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
579 #elif defined(_WIN32)
580 #include <WinNT.h>
581 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
582 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
583 #include <mbarrier.h>
584 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
585 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
586 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
587 #endif
588 #endif
589
590 #ifndef ECB_MEMORY_FENCE
591 #if !ECB_AVOID_PTHREADS
592 /*
593 * if you get undefined symbol references to pthread_mutex_lock,
594 * or failure to find pthread.h, then you should implement
595 * the ECB_MEMORY_FENCE operations for your cpu/compiler
596 * OR provide pthread.h and link against the posix thread library
597 * of your system.
598 */
599 #include <pthread.h>
600 #define ECB_NEEDS_PTHREADS 1
601 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
602
603 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
604 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
605 #endif
606 #endif
607
608 #if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
609 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
610 #endif
611
612 #if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
613 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
614 #endif
615
616 /*****************************************************************************/
617
618 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
619
620 #if __cplusplus
621 #define ecb_inline static inline
622 #elif ECB_GCC_VERSION(2,5)
623 #define ecb_inline static __inline__
624 #elif ECB_C99
625 #define ecb_inline static inline
626 #else
627 #define ecb_inline static
628 #endif
629
630 #if ECB_GCC_VERSION(3,3)
631 #define ecb_restrict __restrict__
632 #elif ECB_C99
633 #define ecb_restrict restrict
634 #else
635 #define ecb_restrict
636 #endif
637
638 typedef int ecb_bool;
639
640 #define ECB_CONCAT_(a, b) a ## b
641 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
642 #define ECB_STRINGIFY_(a) # a
643 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
644
645 #define ecb_function_ ecb_inline
646
647 #if ECB_GCC_VERSION(3,1)
648 #define ecb_attribute(attrlist) __attribute__(attrlist)
649 #define ecb_is_constant(expr) __builtin_constant_p (expr)
650 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
651 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
652 #else
653 #define ecb_attribute(attrlist)
654 #define ecb_is_constant(expr) 0
655 #define ecb_expect(expr,value) (expr)
656 #define ecb_prefetch(addr,rw,locality)
657 #endif
658
659 /* no emulation for ecb_decltype */
660 #if ECB_GCC_VERSION(4,5)
661 #define ecb_decltype(x) __decltype(x)
662 #elif ECB_GCC_VERSION(3,0)
663 #define ecb_decltype(x) __typeof(x)
664 #endif
665
666 #define ecb_noinline ecb_attribute ((__noinline__))
667 #define ecb_noreturn ecb_attribute ((__noreturn__))
668 #define ecb_unused ecb_attribute ((__unused__))
669 #define ecb_const ecb_attribute ((__const__))
670 #define ecb_pure ecb_attribute ((__pure__))
671
672 #if ECB_GCC_VERSION(4,3)
673 #define ecb_artificial ecb_attribute ((__artificial__))
674 #define ecb_hot ecb_attribute ((__hot__))
675 #define ecb_cold ecb_attribute ((__cold__))
676 #else
677 #define ecb_artificial
678 #define ecb_hot
679 #define ecb_cold
680 #endif
681
682 /* put around conditional expressions if you are very sure that the */
683 /* expression is mostly true or mostly false. note that these return */
684 /* booleans, not the expression. */
685 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
686 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
687 /* for compatibility to the rest of the world */
688 #define ecb_likely(expr) ecb_expect_true (expr)
689 #define ecb_unlikely(expr) ecb_expect_false (expr)
690
691 /* count trailing zero bits and count # of one bits */
692 #if ECB_GCC_VERSION(3,4)
693 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
694 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
695 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
696 #define ecb_ctz32(x) __builtin_ctz (x)
697 #define ecb_ctz64(x) __builtin_ctzll (x)
698 #define ecb_popcount32(x) __builtin_popcount (x)
699 /* no popcountll */
700 #else
701 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
702 ecb_function_ int
703 ecb_ctz32 (uint32_t x)
704 {
705 int r = 0;
706
707 x &= ~x + 1; /* this isolates the lowest bit */
708
709 #if ECB_branchless_on_i386
710 r += !!(x & 0xaaaaaaaa) << 0;
711 r += !!(x & 0xcccccccc) << 1;
712 r += !!(x & 0xf0f0f0f0) << 2;
713 r += !!(x & 0xff00ff00) << 3;
714 r += !!(x & 0xffff0000) << 4;
715 #else
716 if (x & 0xaaaaaaaa) r += 1;
717 if (x & 0xcccccccc) r += 2;
718 if (x & 0xf0f0f0f0) r += 4;
719 if (x & 0xff00ff00) r += 8;
720 if (x & 0xffff0000) r += 16;
721 #endif
722
723 return r;
724 }
725
726 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
727 ecb_function_ int
728 ecb_ctz64 (uint64_t x)
729 {
730 int shift = x & 0xffffffffU ? 0 : 32;
731 return ecb_ctz32 (x >> shift) + shift;
732 }
733
734 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
735 ecb_function_ int
736 ecb_popcount32 (uint32_t x)
737 {
738 x -= (x >> 1) & 0x55555555;
739 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
740 x = ((x >> 4) + x) & 0x0f0f0f0f;
741 x *= 0x01010101;
742
743 return x >> 24;
744 }
745
746 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
747 ecb_function_ int ecb_ld32 (uint32_t x)
748 {
749 int r = 0;
750
751 if (x >> 16) { x >>= 16; r += 16; }
752 if (x >> 8) { x >>= 8; r += 8; }
753 if (x >> 4) { x >>= 4; r += 4; }
754 if (x >> 2) { x >>= 2; r += 2; }
755 if (x >> 1) { r += 1; }
756
757 return r;
758 }
759
760 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
761 ecb_function_ int ecb_ld64 (uint64_t x)
762 {
763 int r = 0;
764
765 if (x >> 32) { x >>= 32; r += 32; }
766
767 return r + ecb_ld32 (x);
768 }
769 #endif
770
771 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
772 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
773 {
774 return ( (x * 0x0802U & 0x22110U)
775 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
776 }
777
778 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
779 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
780 {
781 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
782 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
783 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
784 x = ( x >> 8 ) | ( x << 8);
785
786 return x;
787 }
788
789 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
790 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
791 {
792 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
793 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
794 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
795 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
796 x = ( x >> 16 ) | ( x << 16);
797
798 return x;
799 }
800
801 /* popcount64 is only available on 64 bit cpus as gcc builtin */
802 /* so for this version we are lazy */
803 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
804 ecb_function_ int
805 ecb_popcount64 (uint64_t x)
806 {
807 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
808 }
809
810 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
811 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
812 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
813 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
814 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
815 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
816 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
817 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
818
819 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
820 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
821 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
822 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
823 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
824 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
825 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
826 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
827
828 #if ECB_GCC_VERSION(4,3)
829 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
830 #define ecb_bswap32(x) __builtin_bswap32 (x)
831 #define ecb_bswap64(x) __builtin_bswap64 (x)
832 #else
833 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
834 ecb_function_ uint16_t
835 ecb_bswap16 (uint16_t x)
836 {
837 return ecb_rotl16 (x, 8);
838 }
839
840 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
841 ecb_function_ uint32_t
842 ecb_bswap32 (uint32_t x)
843 {
844 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
845 }
846
847 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
848 ecb_function_ uint64_t
849 ecb_bswap64 (uint64_t x)
850 {
851 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
852 }
853 #endif
854
855 #if ECB_GCC_VERSION(4,5)
856 #define ecb_unreachable() __builtin_unreachable ()
857 #else
858 /* this seems to work fine, but gcc always emits a warning for it :/ */
859 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
860 ecb_function_ void ecb_unreachable (void) { }
861 #endif
862
863 /* try to tell the compiler that some condition is definitely true */
864 #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
865
866 ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
867 ecb_function_ unsigned char
868 ecb_byteorder_helper (void)
869 {
870 const uint32_t u = 0x11223344;
871 return *(unsigned char *)&u;
872 }
873
874 ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
875 ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
876 ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
877 ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
878
879 #if ECB_GCC_VERSION(3,0) || ECB_C99
880 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
881 #else
882 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
883 #endif
884
885 #if __cplusplus
886 template<typename T>
887 static inline T ecb_div_rd (T val, T div)
888 {
889 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
890 }
891 template<typename T>
892 static inline T ecb_div_ru (T val, T div)
893 {
894 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
895 }
896 #else
897 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
898 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
899 #endif
900
901 #if ecb_cplusplus_does_not_suck
902 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
903 template<typename T, int N>
904 static inline int ecb_array_length (const T (&arr)[N])
905 {
906 return N;
907 }
908 #else
909 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
910 #endif
911
912 #endif
913
914 /* ECB.H END */
915
916 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
917 /* if your architecture doesn't need memory fences, e.g. because it is
918 * single-cpu/core, or if you use libev in a project that doesn't use libev
919 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
920 * libev, in which cases the memory fences become nops.
921 * alternatively, you can remove this #error and link against libpthread,
922 * which will then provide the memory fences.
923 */
924 # error "memory fences not defined for your architecture, please report"
925 #endif
926
927 #ifndef ECB_MEMORY_FENCE
928 # define ECB_MEMORY_FENCE do { } while (0)
929 # define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
930 # define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
931 #endif
932
933 #define expect_false(cond) ecb_expect_false (cond)
934 #define expect_true(cond) ecb_expect_true (cond)
935 #define noinline ecb_noinline
936
937 #define inline_size ecb_inline
938
939 #if EV_FEATURE_CODE
940 # define inline_speed ecb_inline
941 #else
942 # define inline_speed static noinline
943 #endif
944
945 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
946
947 #if EV_MINPRI == EV_MAXPRI
948 # define ABSPRI(w) (((W)w), 0)
949 #else
950 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
951 #endif
952
953 #define EMPTY /* required for microsofts broken pseudo-c compiler */
954 #define EMPTY2(a,b) /* used to suppress some warnings */
955
956 typedef ev_watcher *W;
957 typedef ev_watcher_list *WL;
958 typedef ev_watcher_time *WT;
959
960 #define ev_active(w) ((W)(w))->active
961 #define ev_at(w) ((WT)(w))->at
962
963 #if EV_USE_REALTIME
964 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
965 /* giving it a reasonably high chance of working on typical architectures */
966 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
967 #endif
968
969 #if EV_USE_MONOTONIC
970 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
971 #endif
972
973 #ifndef EV_FD_TO_WIN32_HANDLE
974 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
975 #endif
976 #ifndef EV_WIN32_HANDLE_TO_FD
977 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
978 #endif
979 #ifndef EV_WIN32_CLOSE_FD
980 # define EV_WIN32_CLOSE_FD(fd) close (fd)
981 #endif
982
983 #ifdef _WIN32
984 # include "ev_win32.c"
985 #endif
986
987 /*****************************************************************************/
988
989 /* define a suitable floor function (only used by periodics atm) */
990
991 #if EV_USE_FLOOR
992 # include <math.h>
993 # define ev_floor(v) floor (v)
994 #else
995
996 #include <float.h>
997
998 /* a floor() replacement function, should be independent of ev_tstamp type */
999 static ev_tstamp noinline
1000 ev_floor (ev_tstamp v)
1001 {
1002 /* the choice of shift factor is not terribly important */
1003 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1004 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1005 #else
1006 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1007 #endif
1008
1009 /* argument too large for an unsigned long? */
1010 if (expect_false (v >= shift))
1011 {
1012 ev_tstamp f;
1013
1014 if (v == v - 1.)
1015 return v; /* very large number */
1016
1017 f = shift * ev_floor (v * (1. / shift));
1018 return f + ev_floor (v - f);
1019 }
1020
1021 /* special treatment for negative args? */
1022 if (expect_false (v < 0.))
1023 {
1024 ev_tstamp f = -ev_floor (-v);
1025
1026 return f - (f == v ? 0 : 1);
1027 }
1028
1029 /* fits into an unsigned long */
1030 return (unsigned long)v;
1031 }
1032
1033 #endif
1034
1035 /*****************************************************************************/
1036
1037 #ifdef __linux
1038 # include <sys/utsname.h>
1039 #endif
1040
1041 static unsigned int noinline ecb_cold
1042 ev_linux_version (void)
1043 {
1044 #ifdef __linux
1045 unsigned int v = 0;
1046 struct utsname buf;
1047 int i;
1048 char *p = buf.release;
1049
1050 if (uname (&buf))
1051 return 0;
1052
1053 for (i = 3+1; --i; )
1054 {
1055 unsigned int c = 0;
1056
1057 for (;;)
1058 {
1059 if (*p >= '0' && *p <= '9')
1060 c = c * 10 + *p++ - '0';
1061 else
1062 {
1063 p += *p == '.';
1064 break;
1065 }
1066 }
1067
1068 v = (v << 8) | c;
1069 }
1070
1071 return v;
1072 #else
1073 return 0;
1074 #endif
1075 }
1076
1077 /*****************************************************************************/
1078
1079 #if EV_AVOID_STDIO
1080 static void noinline ecb_cold
1081 ev_printerr (const char *msg)
1082 {
1083 write (STDERR_FILENO, msg, strlen (msg));
1084 }
1085 #endif
1086
1087 static void (*syserr_cb)(const char *msg);
1088
1089 void ecb_cold
1090 ev_set_syserr_cb (void (*cb)(const char *msg))
1091 {
1092 syserr_cb = cb;
1093 }
1094
1095 static void noinline ecb_cold
1096 ev_syserr (const char *msg)
1097 {
1098 if (!msg)
1099 msg = "(libev) system error";
1100
1101 if (syserr_cb)
1102 syserr_cb (msg);
1103 else
1104 {
1105 #if EV_AVOID_STDIO
1106 ev_printerr (msg);
1107 ev_printerr (": ");
1108 ev_printerr (strerror (errno));
1109 ev_printerr ("\n");
1110 #else
1111 perror (msg);
1112 #endif
1113 abort ();
1114 }
1115 }
1116
1117 static void *
1118 ev_realloc_emul (void *ptr, long size)
1119 {
1120 #if __GLIBC__
1121 return realloc (ptr, size);
1122 #else
1123 /* some systems, notably openbsd and darwin, fail to properly
1124 * implement realloc (x, 0) (as required by both ansi c-89 and
1125 * the single unix specification, so work around them here.
1126 */
1127
1128 if (size)
1129 return realloc (ptr, size);
1130
1131 free (ptr);
1132 return 0;
1133 #endif
1134 }
1135
1136 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
1137
1138 void ecb_cold
1139 ev_set_allocator (void *(*cb)(void *ptr, long size))
1140 {
1141 alloc = cb;
1142 }
1143
1144 inline_speed void *
1145 ev_realloc (void *ptr, long size)
1146 {
1147 ptr = alloc (ptr, size);
1148
1149 if (!ptr && size)
1150 {
1151 #if EV_AVOID_STDIO
1152 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1153 #else
1154 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1155 #endif
1156 abort ();
1157 }
1158
1159 return ptr;
1160 }
1161
1162 #define ev_malloc(size) ev_realloc (0, (size))
1163 #define ev_free(ptr) ev_realloc ((ptr), 0)
1164
1165 /*****************************************************************************/
1166
1167 /* set in reify when reification needed */
1168 #define EV_ANFD_REIFY 1
1169
1170 /* file descriptor info structure */
1171 typedef struct
1172 {
1173 WL head;
1174 unsigned char events; /* the events watched for */
1175 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1176 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1177 unsigned char unused;
1178 #if EV_USE_EPOLL
1179 unsigned int egen; /* generation counter to counter epoll bugs */
1180 #endif
1181 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1182 SOCKET handle;
1183 #endif
1184 #if EV_USE_IOCP
1185 OVERLAPPED or, ow;
1186 #endif
1187 } ANFD;
1188
1189 /* stores the pending event set for a given watcher */
1190 typedef struct
1191 {
1192 W w;
1193 int events; /* the pending event set for the given watcher */
1194 } ANPENDING;
1195
1196 #if EV_USE_INOTIFY
1197 /* hash table entry per inotify-id */
1198 typedef struct
1199 {
1200 WL head;
1201 } ANFS;
1202 #endif
1203
1204 /* Heap Entry */
1205 #if EV_HEAP_CACHE_AT
1206 /* a heap element */
1207 typedef struct {
1208 ev_tstamp at;
1209 WT w;
1210 } ANHE;
1211
1212 #define ANHE_w(he) (he).w /* access watcher, read-write */
1213 #define ANHE_at(he) (he).at /* access cached at, read-only */
1214 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1215 #else
1216 /* a heap element */
1217 typedef WT ANHE;
1218
1219 #define ANHE_w(he) (he)
1220 #define ANHE_at(he) (he)->at
1221 #define ANHE_at_cache(he)
1222 #endif
1223
1224 #if EV_MULTIPLICITY
1225
1226 struct ev_loop
1227 {
1228 ev_tstamp ev_rt_now;
1229 #define ev_rt_now ((loop)->ev_rt_now)
1230 #define VAR(name,decl) decl;
1231 #include "ev_vars.h"
1232 #undef VAR
1233 };
1234 #include "ev_wrap.h"
1235
1236 static struct ev_loop default_loop_struct;
1237 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1238
1239 #else
1240
1241 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1242 #define VAR(name,decl) static decl;
1243 #include "ev_vars.h"
1244 #undef VAR
1245
1246 static int ev_default_loop_ptr;
1247
1248 #endif
1249
1250 #if EV_FEATURE_API
1251 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1252 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1253 # define EV_INVOKE_PENDING invoke_cb (EV_A)
1254 #else
1255 # define EV_RELEASE_CB (void)0
1256 # define EV_ACQUIRE_CB (void)0
1257 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1258 #endif
1259
1260 #define EVBREAK_RECURSE 0x80
1261
1262 /*****************************************************************************/
1263
1264 #ifndef EV_HAVE_EV_TIME
1265 ev_tstamp
1266 ev_time (void)
1267 {
1268 #if EV_USE_REALTIME
1269 if (expect_true (have_realtime))
1270 {
1271 struct timespec ts;
1272 clock_gettime (CLOCK_REALTIME, &ts);
1273 return ts.tv_sec + ts.tv_nsec * 1e-9;
1274 }
1275 #endif
1276
1277 struct timeval tv;
1278 gettimeofday (&tv, 0);
1279 return tv.tv_sec + tv.tv_usec * 1e-6;
1280 }
1281 #endif
1282
1283 inline_size ev_tstamp
1284 get_clock (void)
1285 {
1286 #if EV_USE_MONOTONIC
1287 if (expect_true (have_monotonic))
1288 {
1289 struct timespec ts;
1290 clock_gettime (CLOCK_MONOTONIC, &ts);
1291 return ts.tv_sec + ts.tv_nsec * 1e-9;
1292 }
1293 #endif
1294
1295 return ev_time ();
1296 }
1297
1298 #if EV_MULTIPLICITY
1299 ev_tstamp
1300 ev_now (EV_P)
1301 {
1302 return ev_rt_now;
1303 }
1304 #endif
1305
1306 void
1307 ev_sleep (ev_tstamp delay)
1308 {
1309 if (delay > 0.)
1310 {
1311 #if EV_USE_NANOSLEEP
1312 struct timespec ts;
1313
1314 EV_TS_SET (ts, delay);
1315 nanosleep (&ts, 0);
1316 #elif defined(_WIN32)
1317 Sleep ((unsigned long)(delay * 1e3));
1318 #else
1319 struct timeval tv;
1320
1321 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1322 /* something not guaranteed by newer posix versions, but guaranteed */
1323 /* by older ones */
1324 EV_TV_SET (tv, delay);
1325 select (0, 0, 0, 0, &tv);
1326 #endif
1327 }
1328 }
1329
1330 /*****************************************************************************/
1331
1332 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1333
1334 /* find a suitable new size for the given array, */
1335 /* hopefully by rounding to a nice-to-malloc size */
1336 inline_size int
1337 array_nextsize (int elem, int cur, int cnt)
1338 {
1339 int ncur = cur + 1;
1340
1341 do
1342 ncur <<= 1;
1343 while (cnt > ncur);
1344
1345 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1346 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1347 {
1348 ncur *= elem;
1349 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1350 ncur = ncur - sizeof (void *) * 4;
1351 ncur /= elem;
1352 }
1353
1354 return ncur;
1355 }
1356
1357 static void * noinline ecb_cold
1358 array_realloc (int elem, void *base, int *cur, int cnt)
1359 {
1360 *cur = array_nextsize (elem, *cur, cnt);
1361 return ev_realloc (base, elem * *cur);
1362 }
1363
1364 #define array_init_zero(base,count) \
1365 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1366
1367 #define array_needsize(type,base,cur,cnt,init) \
1368 if (expect_false ((cnt) > (cur))) \
1369 { \
1370 int ecb_unused ocur_ = (cur); \
1371 (base) = (type *)array_realloc \
1372 (sizeof (type), (base), &(cur), (cnt)); \
1373 init ((base) + (ocur_), (cur) - ocur_); \
1374 }
1375
1376 #if 0
1377 #define array_slim(type,stem) \
1378 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1379 { \
1380 stem ## max = array_roundsize (stem ## cnt >> 1); \
1381 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1382 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1383 }
1384 #endif
1385
1386 #define array_free(stem, idx) \
1387 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1388
1389 /*****************************************************************************/
1390
1391 /* dummy callback for pending events */
1392 static void noinline
1393 pendingcb (EV_P_ ev_prepare *w, int revents)
1394 {
1395 }
1396
1397 void noinline
1398 ev_feed_event (EV_P_ void *w, int revents)
1399 {
1400 W w_ = (W)w;
1401 int pri = ABSPRI (w_);
1402
1403 if (expect_false (w_->pending))
1404 pendings [pri][w_->pending - 1].events |= revents;
1405 else
1406 {
1407 w_->pending = ++pendingcnt [pri];
1408 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1409 pendings [pri][w_->pending - 1].w = w_;
1410 pendings [pri][w_->pending - 1].events = revents;
1411 }
1412 }
1413
1414 inline_speed void
1415 feed_reverse (EV_P_ W w)
1416 {
1417 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1418 rfeeds [rfeedcnt++] = w;
1419 }
1420
1421 inline_size void
1422 feed_reverse_done (EV_P_ int revents)
1423 {
1424 do
1425 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1426 while (rfeedcnt);
1427 }
1428
1429 inline_speed void
1430 queue_events (EV_P_ W *events, int eventcnt, int type)
1431 {
1432 int i;
1433
1434 for (i = 0; i < eventcnt; ++i)
1435 ev_feed_event (EV_A_ events [i], type);
1436 }
1437
1438 /*****************************************************************************/
1439
1440 inline_speed void
1441 fd_event_nocheck (EV_P_ int fd, int revents)
1442 {
1443 ANFD *anfd = anfds + fd;
1444 ev_io *w;
1445
1446 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1447 {
1448 int ev = w->events & revents;
1449
1450 if (ev)
1451 ev_feed_event (EV_A_ (W)w, ev);
1452 }
1453 }
1454
1455 /* do not submit kernel events for fds that have reify set */
1456 /* because that means they changed while we were polling for new events */
1457 inline_speed void
1458 fd_event (EV_P_ int fd, int revents)
1459 {
1460 ANFD *anfd = anfds + fd;
1461
1462 if (expect_true (!anfd->reify))
1463 fd_event_nocheck (EV_A_ fd, revents);
1464 }
1465
1466 void
1467 ev_feed_fd_event (EV_P_ int fd, int revents)
1468 {
1469 if (fd >= 0 && fd < anfdmax)
1470 fd_event_nocheck (EV_A_ fd, revents);
1471 }
1472
1473 /* make sure the external fd watch events are in-sync */
1474 /* with the kernel/libev internal state */
1475 inline_size void
1476 fd_reify (EV_P)
1477 {
1478 int i;
1479
1480 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1481 for (i = 0; i < fdchangecnt; ++i)
1482 {
1483 int fd = fdchanges [i];
1484 ANFD *anfd = anfds + fd;
1485
1486 if (anfd->reify & EV__IOFDSET && anfd->head)
1487 {
1488 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1489
1490 if (handle != anfd->handle)
1491 {
1492 unsigned long arg;
1493
1494 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1495
1496 /* handle changed, but fd didn't - we need to do it in two steps */
1497 backend_modify (EV_A_ fd, anfd->events, 0);
1498 anfd->events = 0;
1499 anfd->handle = handle;
1500 }
1501 }
1502 }
1503 #endif
1504
1505 for (i = 0; i < fdchangecnt; ++i)
1506 {
1507 int fd = fdchanges [i];
1508 ANFD *anfd = anfds + fd;
1509 ev_io *w;
1510
1511 unsigned char o_events = anfd->events;
1512 unsigned char o_reify = anfd->reify;
1513
1514 anfd->reify = 0;
1515
1516 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1517 {
1518 anfd->events = 0;
1519
1520 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1521 anfd->events |= (unsigned char)w->events;
1522
1523 if (o_events != anfd->events)
1524 o_reify = EV__IOFDSET; /* actually |= */
1525 }
1526
1527 if (o_reify & EV__IOFDSET)
1528 backend_modify (EV_A_ fd, o_events, anfd->events);
1529 }
1530
1531 fdchangecnt = 0;
1532 }
1533
1534 /* something about the given fd changed */
1535 inline_size void
1536 fd_change (EV_P_ int fd, int flags)
1537 {
1538 unsigned char reify = anfds [fd].reify;
1539 anfds [fd].reify |= flags;
1540
1541 if (expect_true (!reify))
1542 {
1543 ++fdchangecnt;
1544 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1545 fdchanges [fdchangecnt - 1] = fd;
1546 }
1547 }
1548
1549 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1550 inline_speed void ecb_cold
1551 fd_kill (EV_P_ int fd)
1552 {
1553 ev_io *w;
1554
1555 while ((w = (ev_io *)anfds [fd].head))
1556 {
1557 ev_io_stop (EV_A_ w);
1558 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1559 }
1560 }
1561
1562 /* check whether the given fd is actually valid, for error recovery */
1563 inline_size int ecb_cold
1564 fd_valid (int fd)
1565 {
1566 #ifdef _WIN32
1567 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1568 #else
1569 return fcntl (fd, F_GETFD) != -1;
1570 #endif
1571 }
1572
1573 /* called on EBADF to verify fds */
1574 static void noinline ecb_cold
1575 fd_ebadf (EV_P)
1576 {
1577 int fd;
1578
1579 for (fd = 0; fd < anfdmax; ++fd)
1580 if (anfds [fd].events)
1581 if (!fd_valid (fd) && errno == EBADF)
1582 fd_kill (EV_A_ fd);
1583 }
1584
1585 /* called on ENOMEM in select/poll to kill some fds and retry */
1586 static void noinline ecb_cold
1587 fd_enomem (EV_P)
1588 {
1589 int fd;
1590
1591 for (fd = anfdmax; fd--; )
1592 if (anfds [fd].events)
1593 {
1594 fd_kill (EV_A_ fd);
1595 break;
1596 }
1597 }
1598
1599 /* usually called after fork if backend needs to re-arm all fds from scratch */
1600 static void noinline
1601 fd_rearm_all (EV_P)
1602 {
1603 int fd;
1604
1605 for (fd = 0; fd < anfdmax; ++fd)
1606 if (anfds [fd].events)
1607 {
1608 anfds [fd].events = 0;
1609 anfds [fd].emask = 0;
1610 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1611 }
1612 }
1613
1614 /* used to prepare libev internal fd's */
1615 /* this is not fork-safe */
1616 inline_speed void
1617 fd_intern (int fd)
1618 {
1619 #ifdef _WIN32
1620 unsigned long arg = 1;
1621 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1622 #else
1623 fcntl (fd, F_SETFD, FD_CLOEXEC);
1624 fcntl (fd, F_SETFL, O_NONBLOCK);
1625 #endif
1626 }
1627
1628 /*****************************************************************************/
1629
1630 /*
1631 * the heap functions want a real array index. array index 0 is guaranteed to not
1632 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1633 * the branching factor of the d-tree.
1634 */
1635
1636 /*
1637 * at the moment we allow libev the luxury of two heaps,
1638 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1639 * which is more cache-efficient.
1640 * the difference is about 5% with 50000+ watchers.
1641 */
1642 #if EV_USE_4HEAP
1643
1644 #define DHEAP 4
1645 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1646 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1647 #define UPHEAP_DONE(p,k) ((p) == (k))
1648
1649 /* away from the root */
1650 inline_speed void
1651 downheap (ANHE *heap, int N, int k)
1652 {
1653 ANHE he = heap [k];
1654 ANHE *E = heap + N + HEAP0;
1655
1656 for (;;)
1657 {
1658 ev_tstamp minat;
1659 ANHE *minpos;
1660 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1661
1662 /* find minimum child */
1663 if (expect_true (pos + DHEAP - 1 < E))
1664 {
1665 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1666 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1667 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1668 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1669 }
1670 else if (pos < E)
1671 {
1672 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1673 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1674 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1675 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1676 }
1677 else
1678 break;
1679
1680 if (ANHE_at (he) <= minat)
1681 break;
1682
1683 heap [k] = *minpos;
1684 ev_active (ANHE_w (*minpos)) = k;
1685
1686 k = minpos - heap;
1687 }
1688
1689 heap [k] = he;
1690 ev_active (ANHE_w (he)) = k;
1691 }
1692
1693 #else /* 4HEAP */
1694
1695 #define HEAP0 1
1696 #define HPARENT(k) ((k) >> 1)
1697 #define UPHEAP_DONE(p,k) (!(p))
1698
1699 /* away from the root */
1700 inline_speed void
1701 downheap (ANHE *heap, int N, int k)
1702 {
1703 ANHE he = heap [k];
1704
1705 for (;;)
1706 {
1707 int c = k << 1;
1708
1709 if (c >= N + HEAP0)
1710 break;
1711
1712 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1713 ? 1 : 0;
1714
1715 if (ANHE_at (he) <= ANHE_at (heap [c]))
1716 break;
1717
1718 heap [k] = heap [c];
1719 ev_active (ANHE_w (heap [k])) = k;
1720
1721 k = c;
1722 }
1723
1724 heap [k] = he;
1725 ev_active (ANHE_w (he)) = k;
1726 }
1727 #endif
1728
1729 /* towards the root */
1730 inline_speed void
1731 upheap (ANHE *heap, int k)
1732 {
1733 ANHE he = heap [k];
1734
1735 for (;;)
1736 {
1737 int p = HPARENT (k);
1738
1739 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1740 break;
1741
1742 heap [k] = heap [p];
1743 ev_active (ANHE_w (heap [k])) = k;
1744 k = p;
1745 }
1746
1747 heap [k] = he;
1748 ev_active (ANHE_w (he)) = k;
1749 }
1750
1751 /* move an element suitably so it is in a correct place */
1752 inline_size void
1753 adjustheap (ANHE *heap, int N, int k)
1754 {
1755 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1756 upheap (heap, k);
1757 else
1758 downheap (heap, N, k);
1759 }
1760
1761 /* rebuild the heap: this function is used only once and executed rarely */
1762 inline_size void
1763 reheap (ANHE *heap, int N)
1764 {
1765 int i;
1766
1767 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1768 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1769 for (i = 0; i < N; ++i)
1770 upheap (heap, i + HEAP0);
1771 }
1772
1773 /*****************************************************************************/
1774
1775 /* associate signal watchers to a signal signal */
1776 typedef struct
1777 {
1778 EV_ATOMIC_T pending;
1779 #if EV_MULTIPLICITY
1780 EV_P;
1781 #endif
1782 WL head;
1783 } ANSIG;
1784
1785 static ANSIG signals [EV_NSIG - 1];
1786
1787 /*****************************************************************************/
1788
1789 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1790
1791 static void noinline ecb_cold
1792 evpipe_init (EV_P)
1793 {
1794 if (!ev_is_active (&pipe_w))
1795 {
1796 # if EV_USE_EVENTFD
1797 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1798 if (evfd < 0 && errno == EINVAL)
1799 evfd = eventfd (0, 0);
1800
1801 if (evfd >= 0)
1802 {
1803 evpipe [0] = -1;
1804 fd_intern (evfd); /* doing it twice doesn't hurt */
1805 ev_io_set (&pipe_w, evfd, EV_READ);
1806 }
1807 else
1808 # endif
1809 {
1810 while (pipe (evpipe))
1811 ev_syserr ("(libev) error creating signal/async pipe");
1812
1813 fd_intern (evpipe [0]);
1814 fd_intern (evpipe [1]);
1815 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1816 }
1817
1818 ev_io_start (EV_A_ &pipe_w);
1819 ev_unref (EV_A); /* watcher should not keep loop alive */
1820 }
1821 }
1822
1823 inline_speed void
1824 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1825 {
1826 if (expect_true (*flag))
1827 return;
1828
1829 *flag = 1;
1830
1831 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1832
1833 pipe_write_skipped = 1;
1834
1835 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1836
1837 if (pipe_write_wanted)
1838 {
1839 int old_errno;
1840
1841 pipe_write_skipped = 0; /* just an optimisation, no fence needed */
1842
1843 old_errno = errno; /* save errno because write will clobber it */
1844
1845 #if EV_USE_EVENTFD
1846 if (evfd >= 0)
1847 {
1848 uint64_t counter = 1;
1849 write (evfd, &counter, sizeof (uint64_t));
1850 }
1851 else
1852 #endif
1853 {
1854 /* win32 people keep sending patches that change this write() to send() */
1855 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1856 /* so when you think this write should be a send instead, please find out */
1857 /* where your send() is from - it's definitely not the microsoft send, and */
1858 /* tell me. thank you. */
1859 write (evpipe [1], &(evpipe [1]), 1);
1860 }
1861
1862 errno = old_errno;
1863 }
1864 }
1865
1866 /* called whenever the libev signal pipe */
1867 /* got some events (signal, async) */
1868 static void
1869 pipecb (EV_P_ ev_io *iow, int revents)
1870 {
1871 int i;
1872
1873 if (revents & EV_READ)
1874 {
1875 #if EV_USE_EVENTFD
1876 if (evfd >= 0)
1877 {
1878 uint64_t counter;
1879 read (evfd, &counter, sizeof (uint64_t));
1880 }
1881 else
1882 #endif
1883 {
1884 char dummy;
1885 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1886 read (evpipe [0], &dummy, 1);
1887 }
1888 }
1889
1890 pipe_write_skipped = 0;
1891
1892 #if EV_SIGNAL_ENABLE
1893 if (sig_pending)
1894 {
1895 sig_pending = 0;
1896
1897 for (i = EV_NSIG - 1; i--; )
1898 if (expect_false (signals [i].pending))
1899 ev_feed_signal_event (EV_A_ i + 1);
1900 }
1901 #endif
1902
1903 #if EV_ASYNC_ENABLE
1904 if (async_pending)
1905 {
1906 async_pending = 0;
1907
1908 for (i = asynccnt; i--; )
1909 if (asyncs [i]->sent)
1910 {
1911 asyncs [i]->sent = 0;
1912 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1913 }
1914 }
1915 #endif
1916 }
1917
1918 /*****************************************************************************/
1919
1920 void
1921 ev_feed_signal (int signum)
1922 {
1923 #if EV_MULTIPLICITY
1924 EV_P = signals [signum - 1].loop;
1925
1926 if (!EV_A)
1927 return;
1928 #endif
1929
1930 if (!ev_active (&pipe_w))
1931 return;
1932
1933 signals [signum - 1].pending = 1;
1934 evpipe_write (EV_A_ &sig_pending);
1935 }
1936
1937 static void
1938 ev_sighandler (int signum)
1939 {
1940 #ifdef _WIN32
1941 signal (signum, ev_sighandler);
1942 #endif
1943
1944 ev_feed_signal (signum);
1945 }
1946
1947 void noinline
1948 ev_feed_signal_event (EV_P_ int signum)
1949 {
1950 WL w;
1951
1952 if (expect_false (signum <= 0 || signum > EV_NSIG))
1953 return;
1954
1955 --signum;
1956
1957 #if EV_MULTIPLICITY
1958 /* it is permissible to try to feed a signal to the wrong loop */
1959 /* or, likely more useful, feeding a signal nobody is waiting for */
1960
1961 if (expect_false (signals [signum].loop != EV_A))
1962 return;
1963 #endif
1964
1965 signals [signum].pending = 0;
1966
1967 for (w = signals [signum].head; w; w = w->next)
1968 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1969 }
1970
1971 #if EV_USE_SIGNALFD
1972 static void
1973 sigfdcb (EV_P_ ev_io *iow, int revents)
1974 {
1975 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1976
1977 for (;;)
1978 {
1979 ssize_t res = read (sigfd, si, sizeof (si));
1980
1981 /* not ISO-C, as res might be -1, but works with SuS */
1982 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1983 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1984
1985 if (res < (ssize_t)sizeof (si))
1986 break;
1987 }
1988 }
1989 #endif
1990
1991 #endif
1992
1993 /*****************************************************************************/
1994
1995 #if EV_CHILD_ENABLE
1996 static WL childs [EV_PID_HASHSIZE];
1997
1998 static ev_signal childev;
1999
2000 #ifndef WIFCONTINUED
2001 # define WIFCONTINUED(status) 0
2002 #endif
2003
2004 /* handle a single child status event */
2005 inline_speed void
2006 child_reap (EV_P_ int chain, int pid, int status)
2007 {
2008 ev_child *w;
2009 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2010
2011 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2012 {
2013 if ((w->pid == pid || !w->pid)
2014 && (!traced || (w->flags & 1)))
2015 {
2016 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2017 w->rpid = pid;
2018 w->rstatus = status;
2019 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2020 }
2021 }
2022 }
2023
2024 #ifndef WCONTINUED
2025 # define WCONTINUED 0
2026 #endif
2027
2028 /* called on sigchld etc., calls waitpid */
2029 static void
2030 childcb (EV_P_ ev_signal *sw, int revents)
2031 {
2032 int pid, status;
2033
2034 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
2035 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
2036 if (!WCONTINUED
2037 || errno != EINVAL
2038 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2039 return;
2040
2041 /* make sure we are called again until all children have been reaped */
2042 /* we need to do it this way so that the callback gets called before we continue */
2043 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2044
2045 child_reap (EV_A_ pid, pid, status);
2046 if ((EV_PID_HASHSIZE) > 1)
2047 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2048 }
2049
2050 #endif
2051
2052 /*****************************************************************************/
2053
2054 #if EV_USE_IOCP
2055 # include "ev_iocp.c"
2056 #endif
2057 #if EV_USE_PORT
2058 # include "ev_port.c"
2059 #endif
2060 #if EV_USE_KQUEUE
2061 # include "ev_kqueue.c"
2062 #endif
2063 #if EV_USE_EPOLL
2064 # include "ev_epoll.c"
2065 #endif
2066 #if EV_USE_POLL
2067 # include "ev_poll.c"
2068 #endif
2069 #if EV_USE_SELECT
2070 # include "ev_select.c"
2071 #endif
2072
2073 int ecb_cold
2074 ev_version_major (void)
2075 {
2076 return EV_VERSION_MAJOR;
2077 }
2078
2079 int ecb_cold
2080 ev_version_minor (void)
2081 {
2082 return EV_VERSION_MINOR;
2083 }
2084
2085 /* return true if we are running with elevated privileges and should ignore env variables */
2086 int inline_size ecb_cold
2087 enable_secure (void)
2088 {
2089 #ifdef _WIN32
2090 return 0;
2091 #else
2092 return getuid () != geteuid ()
2093 || getgid () != getegid ();
2094 #endif
2095 }
2096
2097 unsigned int ecb_cold
2098 ev_supported_backends (void)
2099 {
2100 unsigned int flags = 0;
2101
2102 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2103 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2104 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2105 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2106 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2107
2108 return flags;
2109 }
2110
2111 unsigned int ecb_cold
2112 ev_recommended_backends (void)
2113 {
2114 unsigned int flags = ev_supported_backends ();
2115
2116 #ifndef __NetBSD__
2117 /* kqueue is borked on everything but netbsd apparently */
2118 /* it usually doesn't work correctly on anything but sockets and pipes */
2119 flags &= ~EVBACKEND_KQUEUE;
2120 #endif
2121 #ifdef __APPLE__
2122 /* only select works correctly on that "unix-certified" platform */
2123 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2124 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2125 #endif
2126 #ifdef __FreeBSD__
2127 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2128 #endif
2129
2130 return flags;
2131 }
2132
2133 unsigned int ecb_cold
2134 ev_embeddable_backends (void)
2135 {
2136 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2137
2138 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2139 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2140 flags &= ~EVBACKEND_EPOLL;
2141
2142 return flags;
2143 }
2144
2145 unsigned int
2146 ev_backend (EV_P)
2147 {
2148 return backend;
2149 }
2150
2151 #if EV_FEATURE_API
2152 unsigned int
2153 ev_iteration (EV_P)
2154 {
2155 return loop_count;
2156 }
2157
2158 unsigned int
2159 ev_depth (EV_P)
2160 {
2161 return loop_depth;
2162 }
2163
2164 void
2165 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
2166 {
2167 io_blocktime = interval;
2168 }
2169
2170 void
2171 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
2172 {
2173 timeout_blocktime = interval;
2174 }
2175
2176 void
2177 ev_set_userdata (EV_P_ void *data)
2178 {
2179 userdata = data;
2180 }
2181
2182 void *
2183 ev_userdata (EV_P)
2184 {
2185 return userdata;
2186 }
2187
2188 void
2189 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
2190 {
2191 invoke_cb = invoke_pending_cb;
2192 }
2193
2194 void
2195 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
2196 {
2197 release_cb = release;
2198 acquire_cb = acquire;
2199 }
2200 #endif
2201
2202 /* initialise a loop structure, must be zero-initialised */
2203 static void noinline ecb_cold
2204 loop_init (EV_P_ unsigned int flags)
2205 {
2206 if (!backend)
2207 {
2208 origflags = flags;
2209
2210 #if EV_USE_REALTIME
2211 if (!have_realtime)
2212 {
2213 struct timespec ts;
2214
2215 if (!clock_gettime (CLOCK_REALTIME, &ts))
2216 have_realtime = 1;
2217 }
2218 #endif
2219
2220 #if EV_USE_MONOTONIC
2221 if (!have_monotonic)
2222 {
2223 struct timespec ts;
2224
2225 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2226 have_monotonic = 1;
2227 }
2228 #endif
2229
2230 /* pid check not overridable via env */
2231 #ifndef _WIN32
2232 if (flags & EVFLAG_FORKCHECK)
2233 curpid = getpid ();
2234 #endif
2235
2236 if (!(flags & EVFLAG_NOENV)
2237 && !enable_secure ()
2238 && getenv ("LIBEV_FLAGS"))
2239 flags = atoi (getenv ("LIBEV_FLAGS"));
2240
2241 ev_rt_now = ev_time ();
2242 mn_now = get_clock ();
2243 now_floor = mn_now;
2244 rtmn_diff = ev_rt_now - mn_now;
2245 #if EV_FEATURE_API
2246 invoke_cb = ev_invoke_pending;
2247 #endif
2248
2249 io_blocktime = 0.;
2250 timeout_blocktime = 0.;
2251 backend = 0;
2252 backend_fd = -1;
2253 sig_pending = 0;
2254 #if EV_ASYNC_ENABLE
2255 async_pending = 0;
2256 #endif
2257 pipe_write_skipped = 0;
2258 pipe_write_wanted = 0;
2259 #if EV_USE_INOTIFY
2260 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2261 #endif
2262 #if EV_USE_SIGNALFD
2263 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2264 #endif
2265
2266 if (!(flags & EVBACKEND_MASK))
2267 flags |= ev_recommended_backends ();
2268
2269 #if EV_USE_IOCP
2270 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2271 #endif
2272 #if EV_USE_PORT
2273 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2274 #endif
2275 #if EV_USE_KQUEUE
2276 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2277 #endif
2278 #if EV_USE_EPOLL
2279 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2280 #endif
2281 #if EV_USE_POLL
2282 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2283 #endif
2284 #if EV_USE_SELECT
2285 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2286 #endif
2287
2288 ev_prepare_init (&pending_w, pendingcb);
2289
2290 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2291 ev_init (&pipe_w, pipecb);
2292 ev_set_priority (&pipe_w, EV_MAXPRI);
2293 #endif
2294 }
2295 }
2296
2297 /* free up a loop structure */
2298 void ecb_cold
2299 ev_loop_destroy (EV_P)
2300 {
2301 int i;
2302
2303 #if EV_MULTIPLICITY
2304 /* mimic free (0) */
2305 if (!EV_A)
2306 return;
2307 #endif
2308
2309 #if EV_CLEANUP_ENABLE
2310 /* queue cleanup watchers (and execute them) */
2311 if (expect_false (cleanupcnt))
2312 {
2313 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2314 EV_INVOKE_PENDING;
2315 }
2316 #endif
2317
2318 #if EV_CHILD_ENABLE
2319 if (ev_is_active (&childev))
2320 {
2321 ev_ref (EV_A); /* child watcher */
2322 ev_signal_stop (EV_A_ &childev);
2323 }
2324 #endif
2325
2326 if (ev_is_active (&pipe_w))
2327 {
2328 /*ev_ref (EV_A);*/
2329 /*ev_io_stop (EV_A_ &pipe_w);*/
2330
2331 #if EV_USE_EVENTFD
2332 if (evfd >= 0)
2333 close (evfd);
2334 #endif
2335
2336 if (evpipe [0] >= 0)
2337 {
2338 EV_WIN32_CLOSE_FD (evpipe [0]);
2339 EV_WIN32_CLOSE_FD (evpipe [1]);
2340 }
2341 }
2342
2343 #if EV_USE_SIGNALFD
2344 if (ev_is_active (&sigfd_w))
2345 close (sigfd);
2346 #endif
2347
2348 #if EV_USE_INOTIFY
2349 if (fs_fd >= 0)
2350 close (fs_fd);
2351 #endif
2352
2353 if (backend_fd >= 0)
2354 close (backend_fd);
2355
2356 #if EV_USE_IOCP
2357 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2358 #endif
2359 #if EV_USE_PORT
2360 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2361 #endif
2362 #if EV_USE_KQUEUE
2363 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2364 #endif
2365 #if EV_USE_EPOLL
2366 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2367 #endif
2368 #if EV_USE_POLL
2369 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2370 #endif
2371 #if EV_USE_SELECT
2372 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2373 #endif
2374
2375 for (i = NUMPRI; i--; )
2376 {
2377 array_free (pending, [i]);
2378 #if EV_IDLE_ENABLE
2379 array_free (idle, [i]);
2380 #endif
2381 }
2382
2383 ev_free (anfds); anfds = 0; anfdmax = 0;
2384
2385 /* have to use the microsoft-never-gets-it-right macro */
2386 array_free (rfeed, EMPTY);
2387 array_free (fdchange, EMPTY);
2388 array_free (timer, EMPTY);
2389 #if EV_PERIODIC_ENABLE
2390 array_free (periodic, EMPTY);
2391 #endif
2392 #if EV_FORK_ENABLE
2393 array_free (fork, EMPTY);
2394 #endif
2395 #if EV_CLEANUP_ENABLE
2396 array_free (cleanup, EMPTY);
2397 #endif
2398 array_free (prepare, EMPTY);
2399 array_free (check, EMPTY);
2400 #if EV_ASYNC_ENABLE
2401 array_free (async, EMPTY);
2402 #endif
2403
2404 backend = 0;
2405
2406 #if EV_MULTIPLICITY
2407 if (ev_is_default_loop (EV_A))
2408 #endif
2409 ev_default_loop_ptr = 0;
2410 #if EV_MULTIPLICITY
2411 else
2412 ev_free (EV_A);
2413 #endif
2414 }
2415
2416 #if EV_USE_INOTIFY
2417 inline_size void infy_fork (EV_P);
2418 #endif
2419
2420 inline_size void
2421 loop_fork (EV_P)
2422 {
2423 #if EV_USE_PORT
2424 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2425 #endif
2426 #if EV_USE_KQUEUE
2427 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2428 #endif
2429 #if EV_USE_EPOLL
2430 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2431 #endif
2432 #if EV_USE_INOTIFY
2433 infy_fork (EV_A);
2434 #endif
2435
2436 if (ev_is_active (&pipe_w))
2437 {
2438 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2439
2440 ev_ref (EV_A);
2441 ev_io_stop (EV_A_ &pipe_w);
2442
2443 #if EV_USE_EVENTFD
2444 if (evfd >= 0)
2445 close (evfd);
2446 #endif
2447
2448 if (evpipe [0] >= 0)
2449 {
2450 EV_WIN32_CLOSE_FD (evpipe [0]);
2451 EV_WIN32_CLOSE_FD (evpipe [1]);
2452 }
2453
2454 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2455 evpipe_init (EV_A);
2456 /* now iterate over everything, in case we missed something */
2457 pipecb (EV_A_ &pipe_w, EV_READ);
2458 #endif
2459 }
2460
2461 postfork = 0;
2462 }
2463
2464 #if EV_MULTIPLICITY
2465
2466 struct ev_loop * ecb_cold
2467 ev_loop_new (unsigned int flags)
2468 {
2469 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2470
2471 memset (EV_A, 0, sizeof (struct ev_loop));
2472 loop_init (EV_A_ flags);
2473
2474 if (ev_backend (EV_A))
2475 return EV_A;
2476
2477 ev_free (EV_A);
2478 return 0;
2479 }
2480
2481 #endif /* multiplicity */
2482
2483 #if EV_VERIFY
2484 static void noinline ecb_cold
2485 verify_watcher (EV_P_ W w)
2486 {
2487 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2488
2489 if (w->pending)
2490 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2491 }
2492
2493 static void noinline ecb_cold
2494 verify_heap (EV_P_ ANHE *heap, int N)
2495 {
2496 int i;
2497
2498 for (i = HEAP0; i < N + HEAP0; ++i)
2499 {
2500 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2501 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2502 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2503
2504 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2505 }
2506 }
2507
2508 static void noinline ecb_cold
2509 array_verify (EV_P_ W *ws, int cnt)
2510 {
2511 while (cnt--)
2512 {
2513 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2514 verify_watcher (EV_A_ ws [cnt]);
2515 }
2516 }
2517 #endif
2518
2519 #if EV_FEATURE_API
2520 void ecb_cold
2521 ev_verify (EV_P)
2522 {
2523 #if EV_VERIFY
2524 int i;
2525 WL w;
2526
2527 assert (activecnt >= -1);
2528
2529 assert (fdchangemax >= fdchangecnt);
2530 for (i = 0; i < fdchangecnt; ++i)
2531 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2532
2533 assert (anfdmax >= 0);
2534 for (i = 0; i < anfdmax; ++i)
2535 for (w = anfds [i].head; w; w = w->next)
2536 {
2537 verify_watcher (EV_A_ (W)w);
2538 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2539 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2540 }
2541
2542 assert (timermax >= timercnt);
2543 verify_heap (EV_A_ timers, timercnt);
2544
2545 #if EV_PERIODIC_ENABLE
2546 assert (periodicmax >= periodiccnt);
2547 verify_heap (EV_A_ periodics, periodiccnt);
2548 #endif
2549
2550 for (i = NUMPRI; i--; )
2551 {
2552 assert (pendingmax [i] >= pendingcnt [i]);
2553 #if EV_IDLE_ENABLE
2554 assert (idleall >= 0);
2555 assert (idlemax [i] >= idlecnt [i]);
2556 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2557 #endif
2558 }
2559
2560 #if EV_FORK_ENABLE
2561 assert (forkmax >= forkcnt);
2562 array_verify (EV_A_ (W *)forks, forkcnt);
2563 #endif
2564
2565 #if EV_CLEANUP_ENABLE
2566 assert (cleanupmax >= cleanupcnt);
2567 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2568 #endif
2569
2570 #if EV_ASYNC_ENABLE
2571 assert (asyncmax >= asynccnt);
2572 array_verify (EV_A_ (W *)asyncs, asynccnt);
2573 #endif
2574
2575 #if EV_PREPARE_ENABLE
2576 assert (preparemax >= preparecnt);
2577 array_verify (EV_A_ (W *)prepares, preparecnt);
2578 #endif
2579
2580 #if EV_CHECK_ENABLE
2581 assert (checkmax >= checkcnt);
2582 array_verify (EV_A_ (W *)checks, checkcnt);
2583 #endif
2584
2585 # if 0
2586 #if EV_CHILD_ENABLE
2587 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2588 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2589 #endif
2590 # endif
2591 #endif
2592 }
2593 #endif
2594
2595 #if EV_MULTIPLICITY
2596 struct ev_loop * ecb_cold
2597 #else
2598 int
2599 #endif
2600 ev_default_loop (unsigned int flags)
2601 {
2602 if (!ev_default_loop_ptr)
2603 {
2604 #if EV_MULTIPLICITY
2605 EV_P = ev_default_loop_ptr = &default_loop_struct;
2606 #else
2607 ev_default_loop_ptr = 1;
2608 #endif
2609
2610 loop_init (EV_A_ flags);
2611
2612 if (ev_backend (EV_A))
2613 {
2614 #if EV_CHILD_ENABLE
2615 ev_signal_init (&childev, childcb, SIGCHLD);
2616 ev_set_priority (&childev, EV_MAXPRI);
2617 ev_signal_start (EV_A_ &childev);
2618 ev_unref (EV_A); /* child watcher should not keep loop alive */
2619 #endif
2620 }
2621 else
2622 ev_default_loop_ptr = 0;
2623 }
2624
2625 return ev_default_loop_ptr;
2626 }
2627
2628 void
2629 ev_loop_fork (EV_P)
2630 {
2631 postfork = 1; /* must be in line with ev_default_fork */
2632 }
2633
2634 /*****************************************************************************/
2635
2636 void
2637 ev_invoke (EV_P_ void *w, int revents)
2638 {
2639 EV_CB_INVOKE ((W)w, revents);
2640 }
2641
2642 unsigned int
2643 ev_pending_count (EV_P)
2644 {
2645 int pri;
2646 unsigned int count = 0;
2647
2648 for (pri = NUMPRI; pri--; )
2649 count += pendingcnt [pri];
2650
2651 return count;
2652 }
2653
2654 void noinline
2655 ev_invoke_pending (EV_P)
2656 {
2657 int pri;
2658
2659 for (pri = NUMPRI; pri--; )
2660 while (pendingcnt [pri])
2661 {
2662 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2663
2664 p->w->pending = 0;
2665 EV_CB_INVOKE (p->w, p->events);
2666 EV_FREQUENT_CHECK;
2667 }
2668 }
2669
2670 #if EV_IDLE_ENABLE
2671 /* make idle watchers pending. this handles the "call-idle */
2672 /* only when higher priorities are idle" logic */
2673 inline_size void
2674 idle_reify (EV_P)
2675 {
2676 if (expect_false (idleall))
2677 {
2678 int pri;
2679
2680 for (pri = NUMPRI; pri--; )
2681 {
2682 if (pendingcnt [pri])
2683 break;
2684
2685 if (idlecnt [pri])
2686 {
2687 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2688 break;
2689 }
2690 }
2691 }
2692 }
2693 #endif
2694
2695 /* make timers pending */
2696 inline_size void
2697 timers_reify (EV_P)
2698 {
2699 EV_FREQUENT_CHECK;
2700
2701 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2702 {
2703 do
2704 {
2705 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2706
2707 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2708
2709 /* first reschedule or stop timer */
2710 if (w->repeat)
2711 {
2712 ev_at (w) += w->repeat;
2713 if (ev_at (w) < mn_now)
2714 ev_at (w) = mn_now;
2715
2716 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2717
2718 ANHE_at_cache (timers [HEAP0]);
2719 downheap (timers, timercnt, HEAP0);
2720 }
2721 else
2722 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2723
2724 EV_FREQUENT_CHECK;
2725 feed_reverse (EV_A_ (W)w);
2726 }
2727 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2728
2729 feed_reverse_done (EV_A_ EV_TIMER);
2730 }
2731 }
2732
2733 #if EV_PERIODIC_ENABLE
2734
2735 static void noinline
2736 periodic_recalc (EV_P_ ev_periodic *w)
2737 {
2738 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2739 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2740
2741 /* the above almost always errs on the low side */
2742 while (at <= ev_rt_now)
2743 {
2744 ev_tstamp nat = at + w->interval;
2745
2746 /* when resolution fails us, we use ev_rt_now */
2747 if (expect_false (nat == at))
2748 {
2749 at = ev_rt_now;
2750 break;
2751 }
2752
2753 at = nat;
2754 }
2755
2756 ev_at (w) = at;
2757 }
2758
2759 /* make periodics pending */
2760 inline_size void
2761 periodics_reify (EV_P)
2762 {
2763 EV_FREQUENT_CHECK;
2764
2765 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2766 {
2767 int feed_count = 0;
2768
2769 do
2770 {
2771 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2772
2773 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2774
2775 /* first reschedule or stop timer */
2776 if (w->reschedule_cb)
2777 {
2778 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2779
2780 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2781
2782 ANHE_at_cache (periodics [HEAP0]);
2783 downheap (periodics, periodiccnt, HEAP0);
2784 }
2785 else if (w->interval)
2786 {
2787 periodic_recalc (EV_A_ w);
2788 ANHE_at_cache (periodics [HEAP0]);
2789 downheap (periodics, periodiccnt, HEAP0);
2790 }
2791 else
2792 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2793
2794 EV_FREQUENT_CHECK;
2795 feed_reverse (EV_A_ (W)w);
2796 }
2797 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2798
2799 feed_reverse_done (EV_A_ EV_PERIODIC);
2800 }
2801 }
2802
2803 /* simply recalculate all periodics */
2804 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2805 static void noinline ecb_cold
2806 periodics_reschedule (EV_P)
2807 {
2808 int i;
2809
2810 /* adjust periodics after time jump */
2811 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2812 {
2813 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2814
2815 if (w->reschedule_cb)
2816 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2817 else if (w->interval)
2818 periodic_recalc (EV_A_ w);
2819
2820 ANHE_at_cache (periodics [i]);
2821 }
2822
2823 reheap (periodics, periodiccnt);
2824 }
2825 #endif
2826
2827 /* adjust all timers by a given offset */
2828 static void noinline ecb_cold
2829 timers_reschedule (EV_P_ ev_tstamp adjust)
2830 {
2831 int i;
2832
2833 for (i = 0; i < timercnt; ++i)
2834 {
2835 ANHE *he = timers + i + HEAP0;
2836 ANHE_w (*he)->at += adjust;
2837 ANHE_at_cache (*he);
2838 }
2839 }
2840
2841 /* fetch new monotonic and realtime times from the kernel */
2842 /* also detect if there was a timejump, and act accordingly */
2843 inline_speed void
2844 time_update (EV_P_ ev_tstamp max_block)
2845 {
2846 #if EV_USE_MONOTONIC
2847 if (expect_true (have_monotonic))
2848 {
2849 int i;
2850 ev_tstamp odiff = rtmn_diff;
2851
2852 mn_now = get_clock ();
2853
2854 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2855 /* interpolate in the meantime */
2856 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2857 {
2858 ev_rt_now = rtmn_diff + mn_now;
2859 return;
2860 }
2861
2862 now_floor = mn_now;
2863 ev_rt_now = ev_time ();
2864
2865 /* loop a few times, before making important decisions.
2866 * on the choice of "4": one iteration isn't enough,
2867 * in case we get preempted during the calls to
2868 * ev_time and get_clock. a second call is almost guaranteed
2869 * to succeed in that case, though. and looping a few more times
2870 * doesn't hurt either as we only do this on time-jumps or
2871 * in the unlikely event of having been preempted here.
2872 */
2873 for (i = 4; --i; )
2874 {
2875 ev_tstamp diff;
2876 rtmn_diff = ev_rt_now - mn_now;
2877
2878 diff = odiff - rtmn_diff;
2879
2880 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2881 return; /* all is well */
2882
2883 ev_rt_now = ev_time ();
2884 mn_now = get_clock ();
2885 now_floor = mn_now;
2886 }
2887
2888 /* no timer adjustment, as the monotonic clock doesn't jump */
2889 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2890 # if EV_PERIODIC_ENABLE
2891 periodics_reschedule (EV_A);
2892 # endif
2893 }
2894 else
2895 #endif
2896 {
2897 ev_rt_now = ev_time ();
2898
2899 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2900 {
2901 /* adjust timers. this is easy, as the offset is the same for all of them */
2902 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2903 #if EV_PERIODIC_ENABLE
2904 periodics_reschedule (EV_A);
2905 #endif
2906 }
2907
2908 mn_now = ev_rt_now;
2909 }
2910 }
2911
2912 void
2913 ev_run (EV_P_ int flags)
2914 {
2915 #if EV_FEATURE_API
2916 ++loop_depth;
2917 #endif
2918
2919 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2920
2921 loop_done = EVBREAK_CANCEL;
2922
2923 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2924
2925 do
2926 {
2927 #if EV_VERIFY >= 2
2928 ev_verify (EV_A);
2929 #endif
2930
2931 #ifndef _WIN32
2932 if (expect_false (curpid)) /* penalise the forking check even more */
2933 if (expect_false (getpid () != curpid))
2934 {
2935 curpid = getpid ();
2936 postfork = 1;
2937 }
2938 #endif
2939
2940 #if EV_FORK_ENABLE
2941 /* we might have forked, so queue fork handlers */
2942 if (expect_false (postfork))
2943 if (forkcnt)
2944 {
2945 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2946 EV_INVOKE_PENDING;
2947 }
2948 #endif
2949
2950 #if EV_PREPARE_ENABLE
2951 /* queue prepare watchers (and execute them) */
2952 if (expect_false (preparecnt))
2953 {
2954 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2955 EV_INVOKE_PENDING;
2956 }
2957 #endif
2958
2959 if (expect_false (loop_done))
2960 break;
2961
2962 /* we might have forked, so reify kernel state if necessary */
2963 if (expect_false (postfork))
2964 loop_fork (EV_A);
2965
2966 /* update fd-related kernel structures */
2967 fd_reify (EV_A);
2968
2969 /* calculate blocking time */
2970 {
2971 ev_tstamp waittime = 0.;
2972 ev_tstamp sleeptime = 0.;
2973
2974 /* remember old timestamp for io_blocktime calculation */
2975 ev_tstamp prev_mn_now = mn_now;
2976
2977 /* update time to cancel out callback processing overhead */
2978 time_update (EV_A_ 1e100);
2979
2980 /* from now on, we want a pipe-wake-up */
2981 pipe_write_wanted = 1;
2982
2983 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
2984
2985 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2986 {
2987 waittime = MAX_BLOCKTIME;
2988
2989 if (timercnt)
2990 {
2991 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2992 if (waittime > to) waittime = to;
2993 }
2994
2995 #if EV_PERIODIC_ENABLE
2996 if (periodiccnt)
2997 {
2998 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2999 if (waittime > to) waittime = to;
3000 }
3001 #endif
3002
3003 /* don't let timeouts decrease the waittime below timeout_blocktime */
3004 if (expect_false (waittime < timeout_blocktime))
3005 waittime = timeout_blocktime;
3006
3007 /* at this point, we NEED to wait, so we have to ensure */
3008 /* to pass a minimum nonzero value to the backend */
3009 if (expect_false (waittime < backend_mintime))
3010 waittime = backend_mintime;
3011
3012 /* extra check because io_blocktime is commonly 0 */
3013 if (expect_false (io_blocktime))
3014 {
3015 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3016
3017 if (sleeptime > waittime - backend_mintime)
3018 sleeptime = waittime - backend_mintime;
3019
3020 if (expect_true (sleeptime > 0.))
3021 {
3022 ev_sleep (sleeptime);
3023 waittime -= sleeptime;
3024 }
3025 }
3026 }
3027
3028 #if EV_FEATURE_API
3029 ++loop_count;
3030 #endif
3031 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3032 backend_poll (EV_A_ waittime);
3033 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3034
3035 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3036
3037 if (pipe_write_skipped)
3038 {
3039 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3040 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3041 }
3042
3043
3044 /* update ev_rt_now, do magic */
3045 time_update (EV_A_ waittime + sleeptime);
3046 }
3047
3048 /* queue pending timers and reschedule them */
3049 timers_reify (EV_A); /* relative timers called last */
3050 #if EV_PERIODIC_ENABLE
3051 periodics_reify (EV_A); /* absolute timers called first */
3052 #endif
3053
3054 #if EV_IDLE_ENABLE
3055 /* queue idle watchers unless other events are pending */
3056 idle_reify (EV_A);
3057 #endif
3058
3059 #if EV_CHECK_ENABLE
3060 /* queue check watchers, to be executed first */
3061 if (expect_false (checkcnt))
3062 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3063 #endif
3064
3065 EV_INVOKE_PENDING;
3066 }
3067 while (expect_true (
3068 activecnt
3069 && !loop_done
3070 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3071 ));
3072
3073 if (loop_done == EVBREAK_ONE)
3074 loop_done = EVBREAK_CANCEL;
3075
3076 #if EV_FEATURE_API
3077 --loop_depth;
3078 #endif
3079 }
3080
3081 void
3082 ev_break (EV_P_ int how)
3083 {
3084 loop_done = how;
3085 }
3086
3087 void
3088 ev_ref (EV_P)
3089 {
3090 ++activecnt;
3091 }
3092
3093 void
3094 ev_unref (EV_P)
3095 {
3096 --activecnt;
3097 }
3098
3099 void
3100 ev_now_update (EV_P)
3101 {
3102 time_update (EV_A_ 1e100);
3103 }
3104
3105 void
3106 ev_suspend (EV_P)
3107 {
3108 ev_now_update (EV_A);
3109 }
3110
3111 void
3112 ev_resume (EV_P)
3113 {
3114 ev_tstamp mn_prev = mn_now;
3115
3116 ev_now_update (EV_A);
3117 timers_reschedule (EV_A_ mn_now - mn_prev);
3118 #if EV_PERIODIC_ENABLE
3119 /* TODO: really do this? */
3120 periodics_reschedule (EV_A);
3121 #endif
3122 }
3123
3124 /*****************************************************************************/
3125 /* singly-linked list management, used when the expected list length is short */
3126
3127 inline_size void
3128 wlist_add (WL *head, WL elem)
3129 {
3130 elem->next = *head;
3131 *head = elem;
3132 }
3133
3134 inline_size void
3135 wlist_del (WL *head, WL elem)
3136 {
3137 while (*head)
3138 {
3139 if (expect_true (*head == elem))
3140 {
3141 *head = elem->next;
3142 break;
3143 }
3144
3145 head = &(*head)->next;
3146 }
3147 }
3148
3149 /* internal, faster, version of ev_clear_pending */
3150 inline_speed void
3151 clear_pending (EV_P_ W w)
3152 {
3153 if (w->pending)
3154 {
3155 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3156 w->pending = 0;
3157 }
3158 }
3159
3160 int
3161 ev_clear_pending (EV_P_ void *w)
3162 {
3163 W w_ = (W)w;
3164 int pending = w_->pending;
3165
3166 if (expect_true (pending))
3167 {
3168 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3169 p->w = (W)&pending_w;
3170 w_->pending = 0;
3171 return p->events;
3172 }
3173 else
3174 return 0;
3175 }
3176
3177 inline_size void
3178 pri_adjust (EV_P_ W w)
3179 {
3180 int pri = ev_priority (w);
3181 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3182 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3183 ev_set_priority (w, pri);
3184 }
3185
3186 inline_speed void
3187 ev_start (EV_P_ W w, int active)
3188 {
3189 pri_adjust (EV_A_ w);
3190 w->active = active;
3191 ev_ref (EV_A);
3192 }
3193
3194 inline_size void
3195 ev_stop (EV_P_ W w)
3196 {
3197 ev_unref (EV_A);
3198 w->active = 0;
3199 }
3200
3201 /*****************************************************************************/
3202
3203 void noinline
3204 ev_io_start (EV_P_ ev_io *w)
3205 {
3206 int fd = w->fd;
3207
3208 if (expect_false (ev_is_active (w)))
3209 return;
3210
3211 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3212 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3213
3214 EV_FREQUENT_CHECK;
3215
3216 ev_start (EV_A_ (W)w, 1);
3217 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3218 wlist_add (&anfds[fd].head, (WL)w);
3219
3220 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3221 w->events &= ~EV__IOFDSET;
3222
3223 EV_FREQUENT_CHECK;
3224 }
3225
3226 void noinline
3227 ev_io_stop (EV_P_ ev_io *w)
3228 {
3229 clear_pending (EV_A_ (W)w);
3230 if (expect_false (!ev_is_active (w)))
3231 return;
3232
3233 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3234
3235 EV_FREQUENT_CHECK;
3236
3237 wlist_del (&anfds[w->fd].head, (WL)w);
3238 ev_stop (EV_A_ (W)w);
3239
3240 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3241
3242 EV_FREQUENT_CHECK;
3243 }
3244
3245 void noinline
3246 ev_timer_start (EV_P_ ev_timer *w)
3247 {
3248 if (expect_false (ev_is_active (w)))
3249 return;
3250
3251 ev_at (w) += mn_now;
3252
3253 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3254
3255 EV_FREQUENT_CHECK;
3256
3257 ++timercnt;
3258 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3259 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3260 ANHE_w (timers [ev_active (w)]) = (WT)w;
3261 ANHE_at_cache (timers [ev_active (w)]);
3262 upheap (timers, ev_active (w));
3263
3264 EV_FREQUENT_CHECK;
3265
3266 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3267 }
3268
3269 void noinline
3270 ev_timer_stop (EV_P_ ev_timer *w)
3271 {
3272 clear_pending (EV_A_ (W)w);
3273 if (expect_false (!ev_is_active (w)))
3274 return;
3275
3276 EV_FREQUENT_CHECK;
3277
3278 {
3279 int active = ev_active (w);
3280
3281 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3282
3283 --timercnt;
3284
3285 if (expect_true (active < timercnt + HEAP0))
3286 {
3287 timers [active] = timers [timercnt + HEAP0];
3288 adjustheap (timers, timercnt, active);
3289 }
3290 }
3291
3292 ev_at (w) -= mn_now;
3293
3294 ev_stop (EV_A_ (W)w);
3295
3296 EV_FREQUENT_CHECK;
3297 }
3298
3299 void noinline
3300 ev_timer_again (EV_P_ ev_timer *w)
3301 {
3302 EV_FREQUENT_CHECK;
3303
3304 if (ev_is_active (w))
3305 {
3306 if (w->repeat)
3307 {
3308 ev_at (w) = mn_now + w->repeat;
3309 ANHE_at_cache (timers [ev_active (w)]);
3310 adjustheap (timers, timercnt, ev_active (w));
3311 }
3312 else
3313 ev_timer_stop (EV_A_ w);
3314 }
3315 else if (w->repeat)
3316 {
3317 ev_at (w) = w->repeat;
3318 ev_timer_start (EV_A_ w);
3319 }
3320
3321 EV_FREQUENT_CHECK;
3322 }
3323
3324 ev_tstamp
3325 ev_timer_remaining (EV_P_ ev_timer *w)
3326 {
3327 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3328 }
3329
3330 #if EV_PERIODIC_ENABLE
3331 void noinline
3332 ev_periodic_start (EV_P_ ev_periodic *w)
3333 {
3334 if (expect_false (ev_is_active (w)))
3335 return;
3336
3337 if (w->reschedule_cb)
3338 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3339 else if (w->interval)
3340 {
3341 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3342 periodic_recalc (EV_A_ w);
3343 }
3344 else
3345 ev_at (w) = w->offset;
3346
3347 EV_FREQUENT_CHECK;
3348
3349 ++periodiccnt;
3350 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3351 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3352 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3353 ANHE_at_cache (periodics [ev_active (w)]);
3354 upheap (periodics, ev_active (w));
3355
3356 EV_FREQUENT_CHECK;
3357
3358 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3359 }
3360
3361 void noinline
3362 ev_periodic_stop (EV_P_ ev_periodic *w)
3363 {
3364 clear_pending (EV_A_ (W)w);
3365 if (expect_false (!ev_is_active (w)))
3366 return;
3367
3368 EV_FREQUENT_CHECK;
3369
3370 {
3371 int active = ev_active (w);
3372
3373 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3374
3375 --periodiccnt;
3376
3377 if (expect_true (active < periodiccnt + HEAP0))
3378 {
3379 periodics [active] = periodics [periodiccnt + HEAP0];
3380 adjustheap (periodics, periodiccnt, active);
3381 }
3382 }
3383
3384 ev_stop (EV_A_ (W)w);
3385
3386 EV_FREQUENT_CHECK;
3387 }
3388
3389 void noinline
3390 ev_periodic_again (EV_P_ ev_periodic *w)
3391 {
3392 /* TODO: use adjustheap and recalculation */
3393 ev_periodic_stop (EV_A_ w);
3394 ev_periodic_start (EV_A_ w);
3395 }
3396 #endif
3397
3398 #ifndef SA_RESTART
3399 # define SA_RESTART 0
3400 #endif
3401
3402 #if EV_SIGNAL_ENABLE
3403
3404 void noinline
3405 ev_signal_start (EV_P_ ev_signal *w)
3406 {
3407 if (expect_false (ev_is_active (w)))
3408 return;
3409
3410 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3411
3412 #if EV_MULTIPLICITY
3413 assert (("libev: a signal must not be attached to two different loops",
3414 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3415
3416 signals [w->signum - 1].loop = EV_A;
3417 #endif
3418
3419 EV_FREQUENT_CHECK;
3420
3421 #if EV_USE_SIGNALFD
3422 if (sigfd == -2)
3423 {
3424 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3425 if (sigfd < 0 && errno == EINVAL)
3426 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3427
3428 if (sigfd >= 0)
3429 {
3430 fd_intern (sigfd); /* doing it twice will not hurt */
3431
3432 sigemptyset (&sigfd_set);
3433
3434 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3435 ev_set_priority (&sigfd_w, EV_MAXPRI);
3436 ev_io_start (EV_A_ &sigfd_w);
3437 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3438 }
3439 }
3440
3441 if (sigfd >= 0)
3442 {
3443 /* TODO: check .head */
3444 sigaddset (&sigfd_set, w->signum);
3445 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3446
3447 signalfd (sigfd, &sigfd_set, 0);
3448 }
3449 #endif
3450
3451 ev_start (EV_A_ (W)w, 1);
3452 wlist_add (&signals [w->signum - 1].head, (WL)w);
3453
3454 if (!((WL)w)->next)
3455 # if EV_USE_SIGNALFD
3456 if (sigfd < 0) /*TODO*/
3457 # endif
3458 {
3459 # ifdef _WIN32
3460 evpipe_init (EV_A);
3461
3462 signal (w->signum, ev_sighandler);
3463 # else
3464 struct sigaction sa;
3465
3466 evpipe_init (EV_A);
3467
3468 sa.sa_handler = ev_sighandler;
3469 sigfillset (&sa.sa_mask);
3470 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3471 sigaction (w->signum, &sa, 0);
3472
3473 if (origflags & EVFLAG_NOSIGMASK)
3474 {
3475 sigemptyset (&sa.sa_mask);
3476 sigaddset (&sa.sa_mask, w->signum);
3477 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3478 }
3479 #endif
3480 }
3481
3482 EV_FREQUENT_CHECK;
3483 }
3484
3485 void noinline
3486 ev_signal_stop (EV_P_ ev_signal *w)
3487 {
3488 clear_pending (EV_A_ (W)w);
3489 if (expect_false (!ev_is_active (w)))
3490 return;
3491
3492 EV_FREQUENT_CHECK;
3493
3494 wlist_del (&signals [w->signum - 1].head, (WL)w);
3495 ev_stop (EV_A_ (W)w);
3496
3497 if (!signals [w->signum - 1].head)
3498 {
3499 #if EV_MULTIPLICITY
3500 signals [w->signum - 1].loop = 0; /* unattach from signal */
3501 #endif
3502 #if EV_USE_SIGNALFD
3503 if (sigfd >= 0)
3504 {
3505 sigset_t ss;
3506
3507 sigemptyset (&ss);
3508 sigaddset (&ss, w->signum);
3509 sigdelset (&sigfd_set, w->signum);
3510
3511 signalfd (sigfd, &sigfd_set, 0);
3512 sigprocmask (SIG_UNBLOCK, &ss, 0);
3513 }
3514 else
3515 #endif
3516 signal (w->signum, SIG_DFL);
3517 }
3518
3519 EV_FREQUENT_CHECK;
3520 }
3521
3522 #endif
3523
3524 #if EV_CHILD_ENABLE
3525
3526 void
3527 ev_child_start (EV_P_ ev_child *w)
3528 {
3529 #if EV_MULTIPLICITY
3530 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3531 #endif
3532 if (expect_false (ev_is_active (w)))
3533 return;
3534
3535 EV_FREQUENT_CHECK;
3536
3537 ev_start (EV_A_ (W)w, 1);
3538 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3539
3540 EV_FREQUENT_CHECK;
3541 }
3542
3543 void
3544 ev_child_stop (EV_P_ ev_child *w)
3545 {
3546 clear_pending (EV_A_ (W)w);
3547 if (expect_false (!ev_is_active (w)))
3548 return;
3549
3550 EV_FREQUENT_CHECK;
3551
3552 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3553 ev_stop (EV_A_ (W)w);
3554
3555 EV_FREQUENT_CHECK;
3556 }
3557
3558 #endif
3559
3560 #if EV_STAT_ENABLE
3561
3562 # ifdef _WIN32
3563 # undef lstat
3564 # define lstat(a,b) _stati64 (a,b)
3565 # endif
3566
3567 #define DEF_STAT_INTERVAL 5.0074891
3568 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3569 #define MIN_STAT_INTERVAL 0.1074891
3570
3571 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3572
3573 #if EV_USE_INOTIFY
3574
3575 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3576 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3577
3578 static void noinline
3579 infy_add (EV_P_ ev_stat *w)
3580 {
3581 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);
3582
3583 if (w->wd >= 0)
3584 {
3585 struct statfs sfs;
3586
3587 /* now local changes will be tracked by inotify, but remote changes won't */
3588 /* unless the filesystem is known to be local, we therefore still poll */
3589 /* also do poll on <2.6.25, but with normal frequency */
3590
3591 if (!fs_2625)
3592 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3593 else if (!statfs (w->path, &sfs)
3594 && (sfs.f_type == 0x1373 /* devfs */
3595 || sfs.f_type == 0xEF53 /* ext2/3 */
3596 || sfs.f_type == 0x3153464a /* jfs */
3597 || sfs.f_type == 0x52654973 /* reiser3 */
3598 || sfs.f_type == 0x01021994 /* tempfs */
3599 || sfs.f_type == 0x58465342 /* xfs */))
3600 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3601 else
3602 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3603 }
3604 else
3605 {
3606 /* can't use inotify, continue to stat */
3607 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3608
3609 /* if path is not there, monitor some parent directory for speedup hints */
3610 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3611 /* but an efficiency issue only */
3612 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3613 {
3614 char path [4096];
3615 strcpy (path, w->path);
3616
3617 do
3618 {
3619 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3620 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3621
3622 char *pend = strrchr (path, '/');
3623
3624 if (!pend || pend == path)
3625 break;
3626
3627 *pend = 0;
3628 w->wd = inotify_add_watch (fs_fd, path, mask);
3629 }
3630 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3631 }
3632 }
3633
3634 if (w->wd >= 0)
3635 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3636
3637 /* now re-arm timer, if required */
3638 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3639 ev_timer_again (EV_A_ &w->timer);
3640 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3641 }
3642
3643 static void noinline
3644 infy_del (EV_P_ ev_stat *w)
3645 {
3646 int slot;
3647 int wd = w->wd;
3648
3649 if (wd < 0)
3650 return;
3651
3652 w->wd = -2;
3653 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3654 wlist_del (&fs_hash [slot].head, (WL)w);
3655
3656 /* remove this watcher, if others are watching it, they will rearm */
3657 inotify_rm_watch (fs_fd, wd);
3658 }
3659
3660 static void noinline
3661 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3662 {
3663 if (slot < 0)
3664 /* overflow, need to check for all hash slots */
3665 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3666 infy_wd (EV_A_ slot, wd, ev);
3667 else
3668 {
3669 WL w_;
3670
3671 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3672 {
3673 ev_stat *w = (ev_stat *)w_;
3674 w_ = w_->next; /* lets us remove this watcher and all before it */
3675
3676 if (w->wd == wd || wd == -1)
3677 {
3678 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3679 {
3680 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3681 w->wd = -1;
3682 infy_add (EV_A_ w); /* re-add, no matter what */
3683 }
3684
3685 stat_timer_cb (EV_A_ &w->timer, 0);
3686 }
3687 }
3688 }
3689 }
3690
3691 static void
3692 infy_cb (EV_P_ ev_io *w, int revents)
3693 {
3694 char buf [EV_INOTIFY_BUFSIZE];
3695 int ofs;
3696 int len = read (fs_fd, buf, sizeof (buf));
3697
3698 for (ofs = 0; ofs < len; )
3699 {
3700 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3701 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3702 ofs += sizeof (struct inotify_event) + ev->len;
3703 }
3704 }
3705
3706 inline_size void ecb_cold
3707 ev_check_2625 (EV_P)
3708 {
3709 /* kernels < 2.6.25 are borked
3710 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3711 */
3712 if (ev_linux_version () < 0x020619)
3713 return;
3714
3715 fs_2625 = 1;
3716 }
3717
3718 inline_size int
3719 infy_newfd (void)
3720 {
3721 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3722 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3723 if (fd >= 0)
3724 return fd;
3725 #endif
3726 return inotify_init ();
3727 }
3728
3729 inline_size void
3730 infy_init (EV_P)
3731 {
3732 if (fs_fd != -2)
3733 return;
3734
3735 fs_fd = -1;
3736
3737 ev_check_2625 (EV_A);
3738
3739 fs_fd = infy_newfd ();
3740
3741 if (fs_fd >= 0)
3742 {
3743 fd_intern (fs_fd);
3744 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3745 ev_set_priority (&fs_w, EV_MAXPRI);
3746 ev_io_start (EV_A_ &fs_w);
3747 ev_unref (EV_A);
3748 }
3749 }
3750
3751 inline_size void
3752 infy_fork (EV_P)
3753 {
3754 int slot;
3755
3756 if (fs_fd < 0)
3757 return;
3758
3759 ev_ref (EV_A);
3760 ev_io_stop (EV_A_ &fs_w);
3761 close (fs_fd);
3762 fs_fd = infy_newfd ();
3763
3764 if (fs_fd >= 0)
3765 {
3766 fd_intern (fs_fd);
3767 ev_io_set (&fs_w, fs_fd, EV_READ);
3768 ev_io_start (EV_A_ &fs_w);
3769 ev_unref (EV_A);
3770 }
3771
3772 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3773 {
3774 WL w_ = fs_hash [slot].head;
3775 fs_hash [slot].head = 0;
3776
3777 while (w_)
3778 {
3779 ev_stat *w = (ev_stat *)w_;
3780 w_ = w_->next; /* lets us add this watcher */
3781
3782 w->wd = -1;
3783
3784 if (fs_fd >= 0)
3785 infy_add (EV_A_ w); /* re-add, no matter what */
3786 else
3787 {
3788 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3789 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3790 ev_timer_again (EV_A_ &w->timer);
3791 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3792 }
3793 }
3794 }
3795 }
3796
3797 #endif
3798
3799 #ifdef _WIN32
3800 # define EV_LSTAT(p,b) _stati64 (p, b)
3801 #else
3802 # define EV_LSTAT(p,b) lstat (p, b)
3803 #endif
3804
3805 void
3806 ev_stat_stat (EV_P_ ev_stat *w)
3807 {
3808 if (lstat (w->path, &w->attr) < 0)
3809 w->attr.st_nlink = 0;
3810 else if (!w->attr.st_nlink)
3811 w->attr.st_nlink = 1;
3812 }
3813
3814 static void noinline
3815 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3816 {
3817 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3818
3819 ev_statdata prev = w->attr;
3820 ev_stat_stat (EV_A_ w);
3821
3822 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3823 if (
3824 prev.st_dev != w->attr.st_dev
3825 || prev.st_ino != w->attr.st_ino
3826 || prev.st_mode != w->attr.st_mode
3827 || prev.st_nlink != w->attr.st_nlink
3828 || prev.st_uid != w->attr.st_uid
3829 || prev.st_gid != w->attr.st_gid
3830 || prev.st_rdev != w->attr.st_rdev
3831 || prev.st_size != w->attr.st_size
3832 || prev.st_atime != w->attr.st_atime
3833 || prev.st_mtime != w->attr.st_mtime
3834 || prev.st_ctime != w->attr.st_ctime
3835 ) {
3836 /* we only update w->prev on actual differences */
3837 /* in case we test more often than invoke the callback, */
3838 /* to ensure that prev is always different to attr */
3839 w->prev = prev;
3840
3841 #if EV_USE_INOTIFY
3842 if (fs_fd >= 0)
3843 {
3844 infy_del (EV_A_ w);
3845 infy_add (EV_A_ w);
3846 ev_stat_stat (EV_A_ w); /* avoid race... */
3847 }
3848 #endif
3849
3850 ev_feed_event (EV_A_ w, EV_STAT);
3851 }
3852 }
3853
3854 void
3855 ev_stat_start (EV_P_ ev_stat *w)
3856 {
3857 if (expect_false (ev_is_active (w)))
3858 return;
3859
3860 ev_stat_stat (EV_A_ w);
3861
3862 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3863 w->interval = MIN_STAT_INTERVAL;
3864
3865 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3866 ev_set_priority (&w->timer, ev_priority (w));
3867
3868 #if EV_USE_INOTIFY
3869 infy_init (EV_A);
3870
3871 if (fs_fd >= 0)
3872 infy_add (EV_A_ w);
3873 else
3874 #endif
3875 {
3876 ev_timer_again (EV_A_ &w->timer);
3877 ev_unref (EV_A);
3878 }
3879
3880 ev_start (EV_A_ (W)w, 1);
3881
3882 EV_FREQUENT_CHECK;
3883 }
3884
3885 void
3886 ev_stat_stop (EV_P_ ev_stat *w)
3887 {
3888 clear_pending (EV_A_ (W)w);
3889 if (expect_false (!ev_is_active (w)))
3890 return;
3891
3892 EV_FREQUENT_CHECK;
3893
3894 #if EV_USE_INOTIFY
3895 infy_del (EV_A_ w);
3896 #endif
3897
3898 if (ev_is_active (&w->timer))
3899 {
3900 ev_ref (EV_A);
3901 ev_timer_stop (EV_A_ &w->timer);
3902 }
3903
3904 ev_stop (EV_A_ (W)w);
3905
3906 EV_FREQUENT_CHECK;
3907 }
3908 #endif
3909
3910 #if EV_IDLE_ENABLE
3911 void
3912 ev_idle_start (EV_P_ ev_idle *w)
3913 {
3914 if (expect_false (ev_is_active (w)))
3915 return;
3916
3917 pri_adjust (EV_A_ (W)w);
3918
3919 EV_FREQUENT_CHECK;
3920
3921 {
3922 int active = ++idlecnt [ABSPRI (w)];
3923
3924 ++idleall;
3925 ev_start (EV_A_ (W)w, active);
3926
3927 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3928 idles [ABSPRI (w)][active - 1] = w;
3929 }
3930
3931 EV_FREQUENT_CHECK;
3932 }
3933
3934 void
3935 ev_idle_stop (EV_P_ ev_idle *w)
3936 {
3937 clear_pending (EV_A_ (W)w);
3938 if (expect_false (!ev_is_active (w)))
3939 return;
3940
3941 EV_FREQUENT_CHECK;
3942
3943 {
3944 int active = ev_active (w);
3945
3946 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3947 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3948
3949 ev_stop (EV_A_ (W)w);
3950 --idleall;
3951 }
3952
3953 EV_FREQUENT_CHECK;
3954 }
3955 #endif
3956
3957 #if EV_PREPARE_ENABLE
3958 void
3959 ev_prepare_start (EV_P_ ev_prepare *w)
3960 {
3961 if (expect_false (ev_is_active (w)))
3962 return;
3963
3964 EV_FREQUENT_CHECK;
3965
3966 ev_start (EV_A_ (W)w, ++preparecnt);
3967 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3968 prepares [preparecnt - 1] = w;
3969
3970 EV_FREQUENT_CHECK;
3971 }
3972
3973 void
3974 ev_prepare_stop (EV_P_ ev_prepare *w)
3975 {
3976 clear_pending (EV_A_ (W)w);
3977 if (expect_false (!ev_is_active (w)))
3978 return;
3979
3980 EV_FREQUENT_CHECK;
3981
3982 {
3983 int active = ev_active (w);
3984
3985 prepares [active - 1] = prepares [--preparecnt];
3986 ev_active (prepares [active - 1]) = active;
3987 }
3988
3989 ev_stop (EV_A_ (W)w);
3990
3991 EV_FREQUENT_CHECK;
3992 }
3993 #endif
3994
3995 #if EV_CHECK_ENABLE
3996 void
3997 ev_check_start (EV_P_ ev_check *w)
3998 {
3999 if (expect_false (ev_is_active (w)))
4000 return;
4001
4002 EV_FREQUENT_CHECK;
4003
4004 ev_start (EV_A_ (W)w, ++checkcnt);
4005 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4006 checks [checkcnt - 1] = w;
4007
4008 EV_FREQUENT_CHECK;
4009 }
4010
4011 void
4012 ev_check_stop (EV_P_ ev_check *w)
4013 {
4014 clear_pending (EV_A_ (W)w);
4015 if (expect_false (!ev_is_active (w)))
4016 return;
4017
4018 EV_FREQUENT_CHECK;
4019
4020 {
4021 int active = ev_active (w);
4022
4023 checks [active - 1] = checks [--checkcnt];
4024 ev_active (checks [active - 1]) = active;
4025 }
4026
4027 ev_stop (EV_A_ (W)w);
4028
4029 EV_FREQUENT_CHECK;
4030 }
4031 #endif
4032
4033 #if EV_EMBED_ENABLE
4034 void noinline
4035 ev_embed_sweep (EV_P_ ev_embed *w)
4036 {
4037 ev_run (w->other, EVRUN_NOWAIT);
4038 }
4039
4040 static void
4041 embed_io_cb (EV_P_ ev_io *io, int revents)
4042 {
4043 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4044
4045 if (ev_cb (w))
4046 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4047 else
4048 ev_run (w->other, EVRUN_NOWAIT);
4049 }
4050
4051 static void
4052 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4053 {
4054 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4055
4056 {
4057 EV_P = w->other;
4058
4059 while (fdchangecnt)
4060 {
4061 fd_reify (EV_A);
4062 ev_run (EV_A_ EVRUN_NOWAIT);
4063 }
4064 }
4065 }
4066
4067 static void
4068 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4069 {
4070 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4071
4072 ev_embed_stop (EV_A_ w);
4073
4074 {
4075 EV_P = w->other;
4076
4077 ev_loop_fork (EV_A);
4078 ev_run (EV_A_ EVRUN_NOWAIT);
4079 }
4080
4081 ev_embed_start (EV_A_ w);
4082 }
4083
4084 #if 0
4085 static void
4086 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4087 {
4088 ev_idle_stop (EV_A_ idle);
4089 }
4090 #endif
4091
4092 void
4093 ev_embed_start (EV_P_ ev_embed *w)
4094 {
4095 if (expect_false (ev_is_active (w)))
4096 return;
4097
4098 {
4099 EV_P = w->other;
4100 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4101 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4102 }
4103
4104 EV_FREQUENT_CHECK;
4105
4106 ev_set_priority (&w->io, ev_priority (w));
4107 ev_io_start (EV_A_ &w->io);
4108
4109 ev_prepare_init (&w->prepare, embed_prepare_cb);
4110 ev_set_priority (&w->prepare, EV_MINPRI);
4111 ev_prepare_start (EV_A_ &w->prepare);
4112
4113 ev_fork_init (&w->fork, embed_fork_cb);
4114 ev_fork_start (EV_A_ &w->fork);
4115
4116 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4117
4118 ev_start (EV_A_ (W)w, 1);
4119
4120 EV_FREQUENT_CHECK;
4121 }
4122
4123 void
4124 ev_embed_stop (EV_P_ ev_embed *w)
4125 {
4126 clear_pending (EV_A_ (W)w);
4127 if (expect_false (!ev_is_active (w)))
4128 return;
4129
4130 EV_FREQUENT_CHECK;
4131
4132 ev_io_stop (EV_A_ &w->io);
4133 ev_prepare_stop (EV_A_ &w->prepare);
4134 ev_fork_stop (EV_A_ &w->fork);
4135
4136 ev_stop (EV_A_ (W)w);
4137
4138 EV_FREQUENT_CHECK;
4139 }
4140 #endif
4141
4142 #if EV_FORK_ENABLE
4143 void
4144 ev_fork_start (EV_P_ ev_fork *w)
4145 {
4146 if (expect_false (ev_is_active (w)))
4147 return;
4148
4149 EV_FREQUENT_CHECK;
4150
4151 ev_start (EV_A_ (W)w, ++forkcnt);
4152 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4153 forks [forkcnt - 1] = w;
4154
4155 EV_FREQUENT_CHECK;
4156 }
4157
4158 void
4159 ev_fork_stop (EV_P_ ev_fork *w)
4160 {
4161 clear_pending (EV_A_ (W)w);
4162 if (expect_false (!ev_is_active (w)))
4163 return;
4164
4165 EV_FREQUENT_CHECK;
4166
4167 {
4168 int active = ev_active (w);
4169
4170 forks [active - 1] = forks [--forkcnt];
4171 ev_active (forks [active - 1]) = active;
4172 }
4173
4174 ev_stop (EV_A_ (W)w);
4175
4176 EV_FREQUENT_CHECK;
4177 }
4178 #endif
4179
4180 #if EV_CLEANUP_ENABLE
4181 void
4182 ev_cleanup_start (EV_P_ ev_cleanup *w)
4183 {
4184 if (expect_false (ev_is_active (w)))
4185 return;
4186
4187 EV_FREQUENT_CHECK;
4188
4189 ev_start (EV_A_ (W)w, ++cleanupcnt);
4190 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4191 cleanups [cleanupcnt - 1] = w;
4192
4193 /* cleanup watchers should never keep a refcount on the loop */
4194 ev_unref (EV_A);
4195 EV_FREQUENT_CHECK;
4196 }
4197
4198 void
4199 ev_cleanup_stop (EV_P_ ev_cleanup *w)
4200 {
4201 clear_pending (EV_A_ (W)w);
4202 if (expect_false (!ev_is_active (w)))
4203 return;
4204
4205 EV_FREQUENT_CHECK;
4206 ev_ref (EV_A);
4207
4208 {
4209 int active = ev_active (w);
4210
4211 cleanups [active - 1] = cleanups [--cleanupcnt];
4212 ev_active (cleanups [active - 1]) = active;
4213 }
4214
4215 ev_stop (EV_A_ (W)w);
4216
4217 EV_FREQUENT_CHECK;
4218 }
4219 #endif
4220
4221 #if EV_ASYNC_ENABLE
4222 void
4223 ev_async_start (EV_P_ ev_async *w)
4224 {
4225 if (expect_false (ev_is_active (w)))
4226 return;
4227
4228 w->sent = 0;
4229
4230 evpipe_init (EV_A);
4231
4232 EV_FREQUENT_CHECK;
4233
4234 ev_start (EV_A_ (W)w, ++asynccnt);
4235 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4236 asyncs [asynccnt - 1] = w;
4237
4238 EV_FREQUENT_CHECK;
4239 }
4240
4241 void
4242 ev_async_stop (EV_P_ ev_async *w)
4243 {
4244 clear_pending (EV_A_ (W)w);
4245 if (expect_false (!ev_is_active (w)))
4246 return;
4247
4248 EV_FREQUENT_CHECK;
4249
4250 {
4251 int active = ev_active (w);
4252
4253 asyncs [active - 1] = asyncs [--asynccnt];
4254 ev_active (asyncs [active - 1]) = active;
4255 }
4256
4257 ev_stop (EV_A_ (W)w);
4258
4259 EV_FREQUENT_CHECK;
4260 }
4261
4262 void
4263 ev_async_send (EV_P_ ev_async *w)
4264 {
4265 w->sent = 1;
4266 evpipe_write (EV_A_ &async_pending);
4267 }
4268 #endif
4269
4270 /*****************************************************************************/
4271
4272 struct ev_once
4273 {
4274 ev_io io;
4275 ev_timer to;
4276 void (*cb)(int revents, void *arg);
4277 void *arg;
4278 };
4279
4280 static void
4281 once_cb (EV_P_ struct ev_once *once, int revents)
4282 {
4283 void (*cb)(int revents, void *arg) = once->cb;
4284 void *arg = once->arg;
4285
4286 ev_io_stop (EV_A_ &once->io);
4287 ev_timer_stop (EV_A_ &once->to);
4288 ev_free (once);
4289
4290 cb (revents, arg);
4291 }
4292
4293 static void
4294 once_cb_io (EV_P_ ev_io *w, int revents)
4295 {
4296 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4297
4298 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4299 }
4300
4301 static void
4302 once_cb_to (EV_P_ ev_timer *w, int revents)
4303 {
4304 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4305
4306 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4307 }
4308
4309 void
4310 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
4311 {
4312 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4313
4314 if (expect_false (!once))
4315 {
4316 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4317 return;
4318 }
4319
4320 once->cb = cb;
4321 once->arg = arg;
4322
4323 ev_init (&once->io, once_cb_io);
4324 if (fd >= 0)
4325 {
4326 ev_io_set (&once->io, fd, events);
4327 ev_io_start (EV_A_ &once->io);
4328 }
4329
4330 ev_init (&once->to, once_cb_to);
4331 if (timeout >= 0.)
4332 {
4333 ev_timer_set (&once->to, timeout, 0.);
4334 ev_timer_start (EV_A_ &once->to);
4335 }
4336 }
4337
4338 /*****************************************************************************/
4339
4340 #if EV_WALK_ENABLE
4341 void ecb_cold
4342 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
4343 {
4344 int i, j;
4345 ev_watcher_list *wl, *wn;
4346
4347 if (types & (EV_IO | EV_EMBED))
4348 for (i = 0; i < anfdmax; ++i)
4349 for (wl = anfds [i].head; wl; )
4350 {
4351 wn = wl->next;
4352
4353 #if EV_EMBED_ENABLE
4354 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4355 {
4356 if (types & EV_EMBED)
4357 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4358 }
4359 else
4360 #endif
4361 #if EV_USE_INOTIFY
4362 if (ev_cb ((ev_io *)wl) == infy_cb)
4363 ;
4364 else
4365 #endif
4366 if ((ev_io *)wl != &pipe_w)
4367 if (types & EV_IO)
4368 cb (EV_A_ EV_IO, wl);
4369
4370 wl = wn;
4371 }
4372
4373 if (types & (EV_TIMER | EV_STAT))
4374 for (i = timercnt + HEAP0; i-- > HEAP0; )
4375 #if EV_STAT_ENABLE
4376 /*TODO: timer is not always active*/
4377 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
4378 {
4379 if (types & EV_STAT)
4380 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
4381 }
4382 else
4383 #endif
4384 if (types & EV_TIMER)
4385 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
4386
4387 #if EV_PERIODIC_ENABLE
4388 if (types & EV_PERIODIC)
4389 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4390 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4391 #endif
4392
4393 #if EV_IDLE_ENABLE
4394 if (types & EV_IDLE)
4395 for (j = NUMPRI; j--; )
4396 for (i = idlecnt [j]; i--; )
4397 cb (EV_A_ EV_IDLE, idles [j][i]);
4398 #endif
4399
4400 #if EV_FORK_ENABLE
4401 if (types & EV_FORK)
4402 for (i = forkcnt; i--; )
4403 if (ev_cb (forks [i]) != embed_fork_cb)
4404 cb (EV_A_ EV_FORK, forks [i]);
4405 #endif
4406
4407 #if EV_ASYNC_ENABLE
4408 if (types & EV_ASYNC)
4409 for (i = asynccnt; i--; )
4410 cb (EV_A_ EV_ASYNC, asyncs [i]);
4411 #endif
4412
4413 #if EV_PREPARE_ENABLE
4414 if (types & EV_PREPARE)
4415 for (i = preparecnt; i--; )
4416 # if EV_EMBED_ENABLE
4417 if (ev_cb (prepares [i]) != embed_prepare_cb)
4418 # endif
4419 cb (EV_A_ EV_PREPARE, prepares [i]);
4420 #endif
4421
4422 #if EV_CHECK_ENABLE
4423 if (types & EV_CHECK)
4424 for (i = checkcnt; i--; )
4425 cb (EV_A_ EV_CHECK, checks [i]);
4426 #endif
4427
4428 #if EV_SIGNAL_ENABLE
4429 if (types & EV_SIGNAL)
4430 for (i = 0; i < EV_NSIG - 1; ++i)
4431 for (wl = signals [i].head; wl; )
4432 {
4433 wn = wl->next;
4434 cb (EV_A_ EV_SIGNAL, wl);
4435 wl = wn;
4436 }
4437 #endif
4438
4439 #if EV_CHILD_ENABLE
4440 if (types & EV_CHILD)
4441 for (i = (EV_PID_HASHSIZE); i--; )
4442 for (wl = childs [i]; wl; )
4443 {
4444 wn = wl->next;
4445 cb (EV_A_ EV_CHILD, wl);
4446 wl = wn;
4447 }
4448 #endif
4449 /* EV_STAT 0x00001000 /* stat data changed */
4450 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4451 }
4452 #endif
4453
4454 #if EV_MULTIPLICITY
4455 #include "ev_wrap.h"
4456 #endif
4457