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Revision: 1.424
Committed: Tue May 1 22:01:40 2012 UTC (12 years, 2 months ago) by root
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Branch: MAIN
Changes since 1.423: +8 -0 lines
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# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011,2012 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 #if EV_NO_THREADS
189 # undef EV_NO_SMP
190 # define EV_NO_SMP 1
191 # undef ECB_NO_THREADS
192 # define ECB_NO_THREADS 1
193 #endif
194 #if EV_NO_SMP
195 # undef EV_NO_SMP
196 # define ECB_NO_SMP 1
197 #endif
198
199 #ifndef _WIN32
200 # include <sys/time.h>
201 # include <sys/wait.h>
202 # include <unistd.h>
203 #else
204 # include <io.h>
205 # define WIN32_LEAN_AND_MEAN
206 # include <windows.h>
207 # ifndef EV_SELECT_IS_WINSOCKET
208 # define EV_SELECT_IS_WINSOCKET 1
209 # endif
210 # undef EV_AVOID_STDIO
211 #endif
212
213 /* OS X, in its infinite idiocy, actually HARDCODES
214 * a limit of 1024 into their select. Where people have brains,
215 * OS X engineers apparently have a vacuum. Or maybe they were
216 * ordered to have a vacuum, or they do anything for money.
217 * This might help. Or not.
218 */
219 #define _DARWIN_UNLIMITED_SELECT 1
220
221 /* this block tries to deduce configuration from header-defined symbols and defaults */
222
223 /* try to deduce the maximum number of signals on this platform */
224 #if defined EV_NSIG
225 /* use what's provided */
226 #elif defined NSIG
227 # define EV_NSIG (NSIG)
228 #elif defined _NSIG
229 # define EV_NSIG (_NSIG)
230 #elif defined SIGMAX
231 # define EV_NSIG (SIGMAX+1)
232 #elif defined SIG_MAX
233 # define EV_NSIG (SIG_MAX+1)
234 #elif defined _SIG_MAX
235 # define EV_NSIG (_SIG_MAX+1)
236 #elif defined MAXSIG
237 # define EV_NSIG (MAXSIG+1)
238 #elif defined MAX_SIG
239 # define EV_NSIG (MAX_SIG+1)
240 #elif defined SIGARRAYSIZE
241 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
242 #elif defined _sys_nsig
243 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
244 #else
245 # error "unable to find value for NSIG, please report"
246 /* to make it compile regardless, just remove the above line, */
247 /* but consider reporting it, too! :) */
248 # define EV_NSIG 65
249 #endif
250
251 #ifndef EV_USE_FLOOR
252 # define EV_USE_FLOOR 0
253 #endif
254
255 #ifndef EV_USE_CLOCK_SYSCALL
256 # if __linux && __GLIBC__ >= 2
257 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
258 # else
259 # define EV_USE_CLOCK_SYSCALL 0
260 # endif
261 #endif
262
263 #ifndef EV_USE_MONOTONIC
264 # if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
265 # define EV_USE_MONOTONIC EV_FEATURE_OS
266 # else
267 # define EV_USE_MONOTONIC 0
268 # endif
269 #endif
270
271 #ifndef EV_USE_REALTIME
272 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
273 #endif
274
275 #ifndef EV_USE_NANOSLEEP
276 # if _POSIX_C_SOURCE >= 199309L
277 # define EV_USE_NANOSLEEP EV_FEATURE_OS
278 # else
279 # define EV_USE_NANOSLEEP 0
280 # endif
281 #endif
282
283 #ifndef EV_USE_SELECT
284 # define EV_USE_SELECT EV_FEATURE_BACKENDS
285 #endif
286
287 #ifndef EV_USE_POLL
288 # ifdef _WIN32
289 # define EV_USE_POLL 0
290 # else
291 # define EV_USE_POLL EV_FEATURE_BACKENDS
292 # endif
293 #endif
294
295 #ifndef EV_USE_EPOLL
296 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
297 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
298 # else
299 # define EV_USE_EPOLL 0
300 # endif
301 #endif
302
303 #ifndef EV_USE_KQUEUE
304 # define EV_USE_KQUEUE 0
305 #endif
306
307 #ifndef EV_USE_PORT
308 # define EV_USE_PORT 0
309 #endif
310
311 #ifndef EV_USE_INOTIFY
312 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
313 # define EV_USE_INOTIFY EV_FEATURE_OS
314 # else
315 # define EV_USE_INOTIFY 0
316 # endif
317 #endif
318
319 #ifndef EV_PID_HASHSIZE
320 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
321 #endif
322
323 #ifndef EV_INOTIFY_HASHSIZE
324 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
325 #endif
326
327 #ifndef EV_USE_EVENTFD
328 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
329 # define EV_USE_EVENTFD EV_FEATURE_OS
330 # else
331 # define EV_USE_EVENTFD 0
332 # endif
333 #endif
334
335 #ifndef EV_USE_SIGNALFD
336 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
337 # define EV_USE_SIGNALFD EV_FEATURE_OS
338 # else
339 # define EV_USE_SIGNALFD 0
340 # endif
341 #endif
342
343 #if 0 /* debugging */
344 # define EV_VERIFY 3
345 # define EV_USE_4HEAP 1
346 # define EV_HEAP_CACHE_AT 1
347 #endif
348
349 #ifndef EV_VERIFY
350 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
351 #endif
352
353 #ifndef EV_USE_4HEAP
354 # define EV_USE_4HEAP EV_FEATURE_DATA
355 #endif
356
357 #ifndef EV_HEAP_CACHE_AT
358 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
359 #endif
360
361 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
362 /* which makes programs even slower. might work on other unices, too. */
363 #if EV_USE_CLOCK_SYSCALL
364 # include <sys/syscall.h>
365 # ifdef SYS_clock_gettime
366 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
367 # undef EV_USE_MONOTONIC
368 # define EV_USE_MONOTONIC 1
369 # else
370 # undef EV_USE_CLOCK_SYSCALL
371 # define EV_USE_CLOCK_SYSCALL 0
372 # endif
373 #endif
374
375 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
376
377 #ifdef _AIX
378 /* AIX has a completely broken poll.h header */
379 # undef EV_USE_POLL
380 # define EV_USE_POLL 0
381 #endif
382
383 #ifndef CLOCK_MONOTONIC
384 # undef EV_USE_MONOTONIC
385 # define EV_USE_MONOTONIC 0
386 #endif
387
388 #ifndef CLOCK_REALTIME
389 # undef EV_USE_REALTIME
390 # define EV_USE_REALTIME 0
391 #endif
392
393 #if !EV_STAT_ENABLE
394 # undef EV_USE_INOTIFY
395 # define EV_USE_INOTIFY 0
396 #endif
397
398 #if !EV_USE_NANOSLEEP
399 /* hp-ux has it in sys/time.h, which we unconditionally include above */
400 # if !defined _WIN32 && !defined __hpux
401 # include <sys/select.h>
402 # endif
403 #endif
404
405 #if EV_USE_INOTIFY
406 # include <sys/statfs.h>
407 # include <sys/inotify.h>
408 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
409 # ifndef IN_DONT_FOLLOW
410 # undef EV_USE_INOTIFY
411 # define EV_USE_INOTIFY 0
412 # endif
413 #endif
414
415 #if EV_SELECT_IS_WINSOCKET
416 # include <winsock.h>
417 #endif
418
419 #if EV_USE_EVENTFD
420 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
421 # include <stdint.h>
422 # ifndef EFD_NONBLOCK
423 # define EFD_NONBLOCK O_NONBLOCK
424 # endif
425 # ifndef EFD_CLOEXEC
426 # ifdef O_CLOEXEC
427 # define EFD_CLOEXEC O_CLOEXEC
428 # else
429 # define EFD_CLOEXEC 02000000
430 # endif
431 # endif
432 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
433 #endif
434
435 #if EV_USE_SIGNALFD
436 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
437 # include <stdint.h>
438 # ifndef SFD_NONBLOCK
439 # define SFD_NONBLOCK O_NONBLOCK
440 # endif
441 # ifndef SFD_CLOEXEC
442 # ifdef O_CLOEXEC
443 # define SFD_CLOEXEC O_CLOEXEC
444 # else
445 # define SFD_CLOEXEC 02000000
446 # endif
447 # endif
448 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
449
450 struct signalfd_siginfo
451 {
452 uint32_t ssi_signo;
453 char pad[128 - sizeof (uint32_t)];
454 };
455 #endif
456
457 /**/
458
459 #if EV_VERIFY >= 3
460 # define EV_FREQUENT_CHECK ev_verify (EV_A)
461 #else
462 # define EV_FREQUENT_CHECK do { } while (0)
463 #endif
464
465 /*
466 * This is used to work around floating point rounding problems.
467 * This value is good at least till the year 4000.
468 */
469 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
470 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
471
472 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
473 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
474
475 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
476 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
477
478 /* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
479 /* ECB.H BEGIN */
480 /*
481 * libecb - http://software.schmorp.de/pkg/libecb
482 *
483 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
484 * Copyright (©) 2011 Emanuele Giaquinta
485 * All rights reserved.
486 *
487 * Redistribution and use in source and binary forms, with or without modifica-
488 * tion, are permitted provided that the following conditions are met:
489 *
490 * 1. Redistributions of source code must retain the above copyright notice,
491 * this list of conditions and the following disclaimer.
492 *
493 * 2. Redistributions in binary form must reproduce the above copyright
494 * notice, this list of conditions and the following disclaimer in the
495 * documentation and/or other materials provided with the distribution.
496 *
497 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
498 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
499 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
500 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
501 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
502 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
503 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
504 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
505 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
506 * OF THE POSSIBILITY OF SUCH DAMAGE.
507 */
508
509 #ifndef ECB_H
510 #define ECB_H
511
512 #ifdef _WIN32
513 typedef signed char int8_t;
514 typedef unsigned char uint8_t;
515 typedef signed short int16_t;
516 typedef unsigned short uint16_t;
517 typedef signed int int32_t;
518 typedef unsigned int uint32_t;
519 #if __GNUC__
520 typedef signed long long int64_t;
521 typedef unsigned long long uint64_t;
522 #else /* _MSC_VER || __BORLANDC__ */
523 typedef signed __int64 int64_t;
524 typedef unsigned __int64 uint64_t;
525 #endif
526 #else
527 #include <inttypes.h>
528 #endif
529
530 /* many compilers define _GNUC_ to some versions but then only implement
531 * what their idiot authors think are the "more important" extensions,
532 * causing enormous grief in return for some better fake benchmark numbers.
533 * or so.
534 * we try to detect these and simply assume they are not gcc - if they have
535 * an issue with that they should have done it right in the first place.
536 */
537 #ifndef ECB_GCC_VERSION
538 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
539 #define ECB_GCC_VERSION(major,minor) 0
540 #else
541 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
542 #endif
543 #endif
544
545 /*****************************************************************************/
546
547 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
548 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
549
550 #if ECB_NO_THREADS
551 # define ECB_NO_SMP 1
552 #endif
553
554 #if ECB_NO_THREADS || ECB_NO_SMP
555 #define ECB_MEMORY_FENCE do { } while (0)
556 #endif
557
558 #ifndef ECB_MEMORY_FENCE
559 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
560 #if __i386 || __i386__
561 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
562 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
563 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
564 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
565 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
566 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
567 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
568 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
569 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
570 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
571 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
572 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
573 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
574 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
575 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
576 #elif __sparc || __sparc__
577 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
578 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
579 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
580 #elif defined __s390__ || defined __s390x__
581 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
582 #elif defined __mips__
583 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
584 #elif defined __alpha__
585 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
586 #endif
587 #endif
588 #endif
589
590 #ifndef ECB_MEMORY_FENCE
591 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
592 #define ECB_MEMORY_FENCE __sync_synchronize ()
593 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
594 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
595 #elif _MSC_VER >= 1400 /* VC++ 2005 */
596 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
597 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
598 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
599 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
600 #elif defined _WIN32
601 #include <WinNT.h>
602 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
603 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
604 #include <mbarrier.h>
605 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
606 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
607 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
608 #elif __xlC__
609 #define ECB_MEMORY_FENCE __sync ()
610 #endif
611 #endif
612
613 #ifndef ECB_MEMORY_FENCE
614 #if !ECB_AVOID_PTHREADS
615 /*
616 * if you get undefined symbol references to pthread_mutex_lock,
617 * or failure to find pthread.h, then you should implement
618 * the ECB_MEMORY_FENCE operations for your cpu/compiler
619 * OR provide pthread.h and link against the posix thread library
620 * of your system.
621 */
622 #include <pthread.h>
623 #define ECB_NEEDS_PTHREADS 1
624 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
625
626 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
627 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
628 #endif
629 #endif
630
631 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
632 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
633 #endif
634
635 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
636 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
637 #endif
638
639 /*****************************************************************************/
640
641 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
642
643 #if __cplusplus
644 #define ecb_inline static inline
645 #elif ECB_GCC_VERSION(2,5)
646 #define ecb_inline static __inline__
647 #elif ECB_C99
648 #define ecb_inline static inline
649 #else
650 #define ecb_inline static
651 #endif
652
653 #if ECB_GCC_VERSION(3,3)
654 #define ecb_restrict __restrict__
655 #elif ECB_C99
656 #define ecb_restrict restrict
657 #else
658 #define ecb_restrict
659 #endif
660
661 typedef int ecb_bool;
662
663 #define ECB_CONCAT_(a, b) a ## b
664 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
665 #define ECB_STRINGIFY_(a) # a
666 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
667
668 #define ecb_function_ ecb_inline
669
670 #if ECB_GCC_VERSION(3,1)
671 #define ecb_attribute(attrlist) __attribute__(attrlist)
672 #define ecb_is_constant(expr) __builtin_constant_p (expr)
673 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
674 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
675 #else
676 #define ecb_attribute(attrlist)
677 #define ecb_is_constant(expr) 0
678 #define ecb_expect(expr,value) (expr)
679 #define ecb_prefetch(addr,rw,locality)
680 #endif
681
682 /* no emulation for ecb_decltype */
683 #if ECB_GCC_VERSION(4,5)
684 #define ecb_decltype(x) __decltype(x)
685 #elif ECB_GCC_VERSION(3,0)
686 #define ecb_decltype(x) __typeof(x)
687 #endif
688
689 #define ecb_noinline ecb_attribute ((__noinline__))
690 #define ecb_noreturn ecb_attribute ((__noreturn__))
691 #define ecb_unused ecb_attribute ((__unused__))
692 #define ecb_const ecb_attribute ((__const__))
693 #define ecb_pure ecb_attribute ((__pure__))
694
695 #if ECB_GCC_VERSION(4,3)
696 #define ecb_artificial ecb_attribute ((__artificial__))
697 #define ecb_hot ecb_attribute ((__hot__))
698 #define ecb_cold ecb_attribute ((__cold__))
699 #else
700 #define ecb_artificial
701 #define ecb_hot
702 #define ecb_cold
703 #endif
704
705 /* put around conditional expressions if you are very sure that the */
706 /* expression is mostly true or mostly false. note that these return */
707 /* booleans, not the expression. */
708 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
709 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
710 /* for compatibility to the rest of the world */
711 #define ecb_likely(expr) ecb_expect_true (expr)
712 #define ecb_unlikely(expr) ecb_expect_false (expr)
713
714 /* count trailing zero bits and count # of one bits */
715 #if ECB_GCC_VERSION(3,4)
716 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
717 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
718 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
719 #define ecb_ctz32(x) __builtin_ctz (x)
720 #define ecb_ctz64(x) __builtin_ctzll (x)
721 #define ecb_popcount32(x) __builtin_popcount (x)
722 /* no popcountll */
723 #else
724 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
725 ecb_function_ int
726 ecb_ctz32 (uint32_t x)
727 {
728 int r = 0;
729
730 x &= ~x + 1; /* this isolates the lowest bit */
731
732 #if ECB_branchless_on_i386
733 r += !!(x & 0xaaaaaaaa) << 0;
734 r += !!(x & 0xcccccccc) << 1;
735 r += !!(x & 0xf0f0f0f0) << 2;
736 r += !!(x & 0xff00ff00) << 3;
737 r += !!(x & 0xffff0000) << 4;
738 #else
739 if (x & 0xaaaaaaaa) r += 1;
740 if (x & 0xcccccccc) r += 2;
741 if (x & 0xf0f0f0f0) r += 4;
742 if (x & 0xff00ff00) r += 8;
743 if (x & 0xffff0000) r += 16;
744 #endif
745
746 return r;
747 }
748
749 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
750 ecb_function_ int
751 ecb_ctz64 (uint64_t x)
752 {
753 int shift = x & 0xffffffffU ? 0 : 32;
754 return ecb_ctz32 (x >> shift) + shift;
755 }
756
757 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
758 ecb_function_ int
759 ecb_popcount32 (uint32_t x)
760 {
761 x -= (x >> 1) & 0x55555555;
762 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
763 x = ((x >> 4) + x) & 0x0f0f0f0f;
764 x *= 0x01010101;
765
766 return x >> 24;
767 }
768
769 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
770 ecb_function_ int ecb_ld32 (uint32_t x)
771 {
772 int r = 0;
773
774 if (x >> 16) { x >>= 16; r += 16; }
775 if (x >> 8) { x >>= 8; r += 8; }
776 if (x >> 4) { x >>= 4; r += 4; }
777 if (x >> 2) { x >>= 2; r += 2; }
778 if (x >> 1) { r += 1; }
779
780 return r;
781 }
782
783 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
784 ecb_function_ int ecb_ld64 (uint64_t x)
785 {
786 int r = 0;
787
788 if (x >> 32) { x >>= 32; r += 32; }
789
790 return r + ecb_ld32 (x);
791 }
792 #endif
793
794 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
795 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
796 {
797 return ( (x * 0x0802U & 0x22110U)
798 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
799 }
800
801 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
802 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
803 {
804 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
805 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
806 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
807 x = ( x >> 8 ) | ( x << 8);
808
809 return x;
810 }
811
812 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
813 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
814 {
815 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
816 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
817 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
818 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
819 x = ( x >> 16 ) | ( x << 16);
820
821 return x;
822 }
823
824 /* popcount64 is only available on 64 bit cpus as gcc builtin */
825 /* so for this version we are lazy */
826 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
827 ecb_function_ int
828 ecb_popcount64 (uint64_t x)
829 {
830 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
831 }
832
833 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
834 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
835 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
836 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
837 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
838 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
839 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
840 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
841
842 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
843 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
844 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
845 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
846 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
847 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
848 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
849 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
850
851 #if ECB_GCC_VERSION(4,3)
852 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
853 #define ecb_bswap32(x) __builtin_bswap32 (x)
854 #define ecb_bswap64(x) __builtin_bswap64 (x)
855 #else
856 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
857 ecb_function_ uint16_t
858 ecb_bswap16 (uint16_t x)
859 {
860 return ecb_rotl16 (x, 8);
861 }
862
863 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
864 ecb_function_ uint32_t
865 ecb_bswap32 (uint32_t x)
866 {
867 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
868 }
869
870 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
871 ecb_function_ uint64_t
872 ecb_bswap64 (uint64_t x)
873 {
874 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
875 }
876 #endif
877
878 #if ECB_GCC_VERSION(4,5)
879 #define ecb_unreachable() __builtin_unreachable ()
880 #else
881 /* this seems to work fine, but gcc always emits a warning for it :/ */
882 ecb_inline void ecb_unreachable (void) ecb_noreturn;
883 ecb_inline void ecb_unreachable (void) { }
884 #endif
885
886 /* try to tell the compiler that some condition is definitely true */
887 #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
888
889 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
890 ecb_inline unsigned char
891 ecb_byteorder_helper (void)
892 {
893 const uint32_t u = 0x11223344;
894 return *(unsigned char *)&u;
895 }
896
897 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
898 ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
899 ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
900 ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
901
902 #if ECB_GCC_VERSION(3,0) || ECB_C99
903 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
904 #else
905 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
906 #endif
907
908 #if __cplusplus
909 template<typename T>
910 static inline T ecb_div_rd (T val, T div)
911 {
912 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
913 }
914 template<typename T>
915 static inline T ecb_div_ru (T val, T div)
916 {
917 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
918 }
919 #else
920 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
921 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
922 #endif
923
924 #if ecb_cplusplus_does_not_suck
925 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
926 template<typename T, int N>
927 static inline int ecb_array_length (const T (&arr)[N])
928 {
929 return N;
930 }
931 #else
932 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
933 #endif
934
935 #endif
936
937 /* ECB.H END */
938
939 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
940 /* if your architecture doesn't need memory fences, e.g. because it is
941 * single-cpu/core, or if you use libev in a project that doesn't use libev
942 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
943 * libev, in which cases the memory fences become nops.
944 * alternatively, you can remove this #error and link against libpthread,
945 * which will then provide the memory fences.
946 */
947 # error "memory fences not defined for your architecture, please report"
948 #endif
949
950 #ifndef ECB_MEMORY_FENCE
951 # define ECB_MEMORY_FENCE do { } while (0)
952 # define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
953 # define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
954 #endif
955
956 #define expect_false(cond) ecb_expect_false (cond)
957 #define expect_true(cond) ecb_expect_true (cond)
958 #define noinline ecb_noinline
959
960 #define inline_size ecb_inline
961
962 #if EV_FEATURE_CODE
963 # define inline_speed ecb_inline
964 #else
965 # define inline_speed static noinline
966 #endif
967
968 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
969
970 #if EV_MINPRI == EV_MAXPRI
971 # define ABSPRI(w) (((W)w), 0)
972 #else
973 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
974 #endif
975
976 #define EMPTY /* required for microsofts broken pseudo-c compiler */
977 #define EMPTY2(a,b) /* used to suppress some warnings */
978
979 typedef ev_watcher *W;
980 typedef ev_watcher_list *WL;
981 typedef ev_watcher_time *WT;
982
983 #define ev_active(w) ((W)(w))->active
984 #define ev_at(w) ((WT)(w))->at
985
986 #if EV_USE_REALTIME
987 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
988 /* giving it a reasonably high chance of working on typical architectures */
989 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
990 #endif
991
992 #if EV_USE_MONOTONIC
993 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
994 #endif
995
996 #ifndef EV_FD_TO_WIN32_HANDLE
997 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
998 #endif
999 #ifndef EV_WIN32_HANDLE_TO_FD
1000 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
1001 #endif
1002 #ifndef EV_WIN32_CLOSE_FD
1003 # define EV_WIN32_CLOSE_FD(fd) close (fd)
1004 #endif
1005
1006 #ifdef _WIN32
1007 # include "ev_win32.c"
1008 #endif
1009
1010 /*****************************************************************************/
1011
1012 /* define a suitable floor function (only used by periodics atm) */
1013
1014 #if EV_USE_FLOOR
1015 # include <math.h>
1016 # define ev_floor(v) floor (v)
1017 #else
1018
1019 #include <float.h>
1020
1021 /* a floor() replacement function, should be independent of ev_tstamp type */
1022 static ev_tstamp noinline
1023 ev_floor (ev_tstamp v)
1024 {
1025 /* the choice of shift factor is not terribly important */
1026 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1027 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1028 #else
1029 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1030 #endif
1031
1032 /* argument too large for an unsigned long? */
1033 if (expect_false (v >= shift))
1034 {
1035 ev_tstamp f;
1036
1037 if (v == v - 1.)
1038 return v; /* very large number */
1039
1040 f = shift * ev_floor (v * (1. / shift));
1041 return f + ev_floor (v - f);
1042 }
1043
1044 /* special treatment for negative args? */
1045 if (expect_false (v < 0.))
1046 {
1047 ev_tstamp f = -ev_floor (-v);
1048
1049 return f - (f == v ? 0 : 1);
1050 }
1051
1052 /* fits into an unsigned long */
1053 return (unsigned long)v;
1054 }
1055
1056 #endif
1057
1058 /*****************************************************************************/
1059
1060 #ifdef __linux
1061 # include <sys/utsname.h>
1062 #endif
1063
1064 static unsigned int noinline ecb_cold
1065 ev_linux_version (void)
1066 {
1067 #ifdef __linux
1068 unsigned int v = 0;
1069 struct utsname buf;
1070 int i;
1071 char *p = buf.release;
1072
1073 if (uname (&buf))
1074 return 0;
1075
1076 for (i = 3+1; --i; )
1077 {
1078 unsigned int c = 0;
1079
1080 for (;;)
1081 {
1082 if (*p >= '0' && *p <= '9')
1083 c = c * 10 + *p++ - '0';
1084 else
1085 {
1086 p += *p == '.';
1087 break;
1088 }
1089 }
1090
1091 v = (v << 8) | c;
1092 }
1093
1094 return v;
1095 #else
1096 return 0;
1097 #endif
1098 }
1099
1100 /*****************************************************************************/
1101
1102 #if EV_AVOID_STDIO
1103 static void noinline ecb_cold
1104 ev_printerr (const char *msg)
1105 {
1106 write (STDERR_FILENO, msg, strlen (msg));
1107 }
1108 #endif
1109
1110 static void (*syserr_cb)(const char *msg) EV_THROW;
1111
1112 void ecb_cold
1113 ev_set_syserr_cb (void (*cb)(const char *msg)) EV_THROW
1114 {
1115 syserr_cb = cb;
1116 }
1117
1118 static void noinline ecb_cold
1119 ev_syserr (const char *msg)
1120 {
1121 if (!msg)
1122 msg = "(libev) system error";
1123
1124 if (syserr_cb)
1125 syserr_cb (msg);
1126 else
1127 {
1128 #if EV_AVOID_STDIO
1129 ev_printerr (msg);
1130 ev_printerr (": ");
1131 ev_printerr (strerror (errno));
1132 ev_printerr ("\n");
1133 #else
1134 perror (msg);
1135 #endif
1136 abort ();
1137 }
1138 }
1139
1140 static void *
1141 ev_realloc_emul (void *ptr, long size)
1142 {
1143 #if __GLIBC__
1144 return realloc (ptr, size);
1145 #else
1146 /* some systems, notably openbsd and darwin, fail to properly
1147 * implement realloc (x, 0) (as required by both ansi c-89 and
1148 * the single unix specification, so work around them here.
1149 */
1150
1151 if (size)
1152 return realloc (ptr, size);
1153
1154 free (ptr);
1155 return 0;
1156 #endif
1157 }
1158
1159 static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1160
1161 void ecb_cold
1162 ev_set_allocator (void *(*cb)(void *ptr, long size)) EV_THROW
1163 {
1164 alloc = cb;
1165 }
1166
1167 inline_speed void *
1168 ev_realloc (void *ptr, long size)
1169 {
1170 ptr = alloc (ptr, size);
1171
1172 if (!ptr && size)
1173 {
1174 #if EV_AVOID_STDIO
1175 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1176 #else
1177 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1178 #endif
1179 abort ();
1180 }
1181
1182 return ptr;
1183 }
1184
1185 #define ev_malloc(size) ev_realloc (0, (size))
1186 #define ev_free(ptr) ev_realloc ((ptr), 0)
1187
1188 /*****************************************************************************/
1189
1190 /* set in reify when reification needed */
1191 #define EV_ANFD_REIFY 1
1192
1193 /* file descriptor info structure */
1194 typedef struct
1195 {
1196 WL head;
1197 unsigned char events; /* the events watched for */
1198 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1199 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1200 unsigned char unused;
1201 #if EV_USE_EPOLL
1202 unsigned int egen; /* generation counter to counter epoll bugs */
1203 #endif
1204 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1205 SOCKET handle;
1206 #endif
1207 #if EV_USE_IOCP
1208 OVERLAPPED or, ow;
1209 #endif
1210 } ANFD;
1211
1212 /* stores the pending event set for a given watcher */
1213 typedef struct
1214 {
1215 W w;
1216 int events; /* the pending event set for the given watcher */
1217 } ANPENDING;
1218
1219 #if EV_USE_INOTIFY
1220 /* hash table entry per inotify-id */
1221 typedef struct
1222 {
1223 WL head;
1224 } ANFS;
1225 #endif
1226
1227 /* Heap Entry */
1228 #if EV_HEAP_CACHE_AT
1229 /* a heap element */
1230 typedef struct {
1231 ev_tstamp at;
1232 WT w;
1233 } ANHE;
1234
1235 #define ANHE_w(he) (he).w /* access watcher, read-write */
1236 #define ANHE_at(he) (he).at /* access cached at, read-only */
1237 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1238 #else
1239 /* a heap element */
1240 typedef WT ANHE;
1241
1242 #define ANHE_w(he) (he)
1243 #define ANHE_at(he) (he)->at
1244 #define ANHE_at_cache(he)
1245 #endif
1246
1247 #if EV_MULTIPLICITY
1248
1249 struct ev_loop
1250 {
1251 ev_tstamp ev_rt_now;
1252 #define ev_rt_now ((loop)->ev_rt_now)
1253 #define VAR(name,decl) decl;
1254 #include "ev_vars.h"
1255 #undef VAR
1256 };
1257 #include "ev_wrap.h"
1258
1259 static struct ev_loop default_loop_struct;
1260 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1261
1262 #else
1263
1264 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1265 #define VAR(name,decl) static decl;
1266 #include "ev_vars.h"
1267 #undef VAR
1268
1269 static int ev_default_loop_ptr;
1270
1271 #endif
1272
1273 #if EV_FEATURE_API
1274 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1275 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1276 # define EV_INVOKE_PENDING invoke_cb (EV_A)
1277 #else
1278 # define EV_RELEASE_CB (void)0
1279 # define EV_ACQUIRE_CB (void)0
1280 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1281 #endif
1282
1283 #define EVBREAK_RECURSE 0x80
1284
1285 /*****************************************************************************/
1286
1287 #ifndef EV_HAVE_EV_TIME
1288 ev_tstamp
1289 ev_time (void) EV_THROW
1290 {
1291 #if EV_USE_REALTIME
1292 if (expect_true (have_realtime))
1293 {
1294 struct timespec ts;
1295 clock_gettime (CLOCK_REALTIME, &ts);
1296 return ts.tv_sec + ts.tv_nsec * 1e-9;
1297 }
1298 #endif
1299
1300 struct timeval tv;
1301 gettimeofday (&tv, 0);
1302 return tv.tv_sec + tv.tv_usec * 1e-6;
1303 }
1304 #endif
1305
1306 inline_size ev_tstamp
1307 get_clock (void)
1308 {
1309 #if EV_USE_MONOTONIC
1310 if (expect_true (have_monotonic))
1311 {
1312 struct timespec ts;
1313 clock_gettime (CLOCK_MONOTONIC, &ts);
1314 return ts.tv_sec + ts.tv_nsec * 1e-9;
1315 }
1316 #endif
1317
1318 return ev_time ();
1319 }
1320
1321 #if EV_MULTIPLICITY
1322 ev_tstamp
1323 ev_now (EV_P) EV_THROW
1324 {
1325 return ev_rt_now;
1326 }
1327 #endif
1328
1329 void
1330 ev_sleep (ev_tstamp delay) EV_THROW
1331 {
1332 if (delay > 0.)
1333 {
1334 #if EV_USE_NANOSLEEP
1335 struct timespec ts;
1336
1337 EV_TS_SET (ts, delay);
1338 nanosleep (&ts, 0);
1339 #elif defined _WIN32
1340 Sleep ((unsigned long)(delay * 1e3));
1341 #else
1342 struct timeval tv;
1343
1344 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1345 /* something not guaranteed by newer posix versions, but guaranteed */
1346 /* by older ones */
1347 EV_TV_SET (tv, delay);
1348 select (0, 0, 0, 0, &tv);
1349 #endif
1350 }
1351 }
1352
1353 /*****************************************************************************/
1354
1355 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1356
1357 /* find a suitable new size for the given array, */
1358 /* hopefully by rounding to a nice-to-malloc size */
1359 inline_size int
1360 array_nextsize (int elem, int cur, int cnt)
1361 {
1362 int ncur = cur + 1;
1363
1364 do
1365 ncur <<= 1;
1366 while (cnt > ncur);
1367
1368 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1369 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1370 {
1371 ncur *= elem;
1372 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1373 ncur = ncur - sizeof (void *) * 4;
1374 ncur /= elem;
1375 }
1376
1377 return ncur;
1378 }
1379
1380 static void * noinline ecb_cold
1381 array_realloc (int elem, void *base, int *cur, int cnt)
1382 {
1383 *cur = array_nextsize (elem, *cur, cnt);
1384 return ev_realloc (base, elem * *cur);
1385 }
1386
1387 #define array_init_zero(base,count) \
1388 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1389
1390 #define array_needsize(type,base,cur,cnt,init) \
1391 if (expect_false ((cnt) > (cur))) \
1392 { \
1393 int ecb_unused ocur_ = (cur); \
1394 (base) = (type *)array_realloc \
1395 (sizeof (type), (base), &(cur), (cnt)); \
1396 init ((base) + (ocur_), (cur) - ocur_); \
1397 }
1398
1399 #if 0
1400 #define array_slim(type,stem) \
1401 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1402 { \
1403 stem ## max = array_roundsize (stem ## cnt >> 1); \
1404 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1405 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1406 }
1407 #endif
1408
1409 #define array_free(stem, idx) \
1410 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1411
1412 /*****************************************************************************/
1413
1414 /* dummy callback for pending events */
1415 static void noinline
1416 pendingcb (EV_P_ ev_prepare *w, int revents)
1417 {
1418 }
1419
1420 void noinline
1421 ev_feed_event (EV_P_ void *w, int revents) EV_THROW
1422 {
1423 W w_ = (W)w;
1424 int pri = ABSPRI (w_);
1425
1426 if (expect_false (w_->pending))
1427 pendings [pri][w_->pending - 1].events |= revents;
1428 else
1429 {
1430 w_->pending = ++pendingcnt [pri];
1431 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1432 pendings [pri][w_->pending - 1].w = w_;
1433 pendings [pri][w_->pending - 1].events = revents;
1434 }
1435 }
1436
1437 inline_speed void
1438 feed_reverse (EV_P_ W w)
1439 {
1440 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1441 rfeeds [rfeedcnt++] = w;
1442 }
1443
1444 inline_size void
1445 feed_reverse_done (EV_P_ int revents)
1446 {
1447 do
1448 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1449 while (rfeedcnt);
1450 }
1451
1452 inline_speed void
1453 queue_events (EV_P_ W *events, int eventcnt, int type)
1454 {
1455 int i;
1456
1457 for (i = 0; i < eventcnt; ++i)
1458 ev_feed_event (EV_A_ events [i], type);
1459 }
1460
1461 /*****************************************************************************/
1462
1463 inline_speed void
1464 fd_event_nocheck (EV_P_ int fd, int revents)
1465 {
1466 ANFD *anfd = anfds + fd;
1467 ev_io *w;
1468
1469 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1470 {
1471 int ev = w->events & revents;
1472
1473 if (ev)
1474 ev_feed_event (EV_A_ (W)w, ev);
1475 }
1476 }
1477
1478 /* do not submit kernel events for fds that have reify set */
1479 /* because that means they changed while we were polling for new events */
1480 inline_speed void
1481 fd_event (EV_P_ int fd, int revents)
1482 {
1483 ANFD *anfd = anfds + fd;
1484
1485 if (expect_true (!anfd->reify))
1486 fd_event_nocheck (EV_A_ fd, revents);
1487 }
1488
1489 void
1490 ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
1491 {
1492 if (fd >= 0 && fd < anfdmax)
1493 fd_event_nocheck (EV_A_ fd, revents);
1494 }
1495
1496 /* make sure the external fd watch events are in-sync */
1497 /* with the kernel/libev internal state */
1498 inline_size void
1499 fd_reify (EV_P)
1500 {
1501 int i;
1502
1503 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1504 for (i = 0; i < fdchangecnt; ++i)
1505 {
1506 int fd = fdchanges [i];
1507 ANFD *anfd = anfds + fd;
1508
1509 if (anfd->reify & EV__IOFDSET && anfd->head)
1510 {
1511 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1512
1513 if (handle != anfd->handle)
1514 {
1515 unsigned long arg;
1516
1517 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1518
1519 /* handle changed, but fd didn't - we need to do it in two steps */
1520 backend_modify (EV_A_ fd, anfd->events, 0);
1521 anfd->events = 0;
1522 anfd->handle = handle;
1523 }
1524 }
1525 }
1526 #endif
1527
1528 for (i = 0; i < fdchangecnt; ++i)
1529 {
1530 int fd = fdchanges [i];
1531 ANFD *anfd = anfds + fd;
1532 ev_io *w;
1533
1534 unsigned char o_events = anfd->events;
1535 unsigned char o_reify = anfd->reify;
1536
1537 anfd->reify = 0;
1538
1539 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1540 {
1541 anfd->events = 0;
1542
1543 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1544 anfd->events |= (unsigned char)w->events;
1545
1546 if (o_events != anfd->events)
1547 o_reify = EV__IOFDSET; /* actually |= */
1548 }
1549
1550 if (o_reify & EV__IOFDSET)
1551 backend_modify (EV_A_ fd, o_events, anfd->events);
1552 }
1553
1554 fdchangecnt = 0;
1555 }
1556
1557 /* something about the given fd changed */
1558 inline_size void
1559 fd_change (EV_P_ int fd, int flags)
1560 {
1561 unsigned char reify = anfds [fd].reify;
1562 anfds [fd].reify |= flags;
1563
1564 if (expect_true (!reify))
1565 {
1566 ++fdchangecnt;
1567 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1568 fdchanges [fdchangecnt - 1] = fd;
1569 }
1570 }
1571
1572 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1573 inline_speed void ecb_cold
1574 fd_kill (EV_P_ int fd)
1575 {
1576 ev_io *w;
1577
1578 while ((w = (ev_io *)anfds [fd].head))
1579 {
1580 ev_io_stop (EV_A_ w);
1581 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1582 }
1583 }
1584
1585 /* check whether the given fd is actually valid, for error recovery */
1586 inline_size int ecb_cold
1587 fd_valid (int fd)
1588 {
1589 #ifdef _WIN32
1590 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1591 #else
1592 return fcntl (fd, F_GETFD) != -1;
1593 #endif
1594 }
1595
1596 /* called on EBADF to verify fds */
1597 static void noinline ecb_cold
1598 fd_ebadf (EV_P)
1599 {
1600 int fd;
1601
1602 for (fd = 0; fd < anfdmax; ++fd)
1603 if (anfds [fd].events)
1604 if (!fd_valid (fd) && errno == EBADF)
1605 fd_kill (EV_A_ fd);
1606 }
1607
1608 /* called on ENOMEM in select/poll to kill some fds and retry */
1609 static void noinline ecb_cold
1610 fd_enomem (EV_P)
1611 {
1612 int fd;
1613
1614 for (fd = anfdmax; fd--; )
1615 if (anfds [fd].events)
1616 {
1617 fd_kill (EV_A_ fd);
1618 break;
1619 }
1620 }
1621
1622 /* usually called after fork if backend needs to re-arm all fds from scratch */
1623 static void noinline
1624 fd_rearm_all (EV_P)
1625 {
1626 int fd;
1627
1628 for (fd = 0; fd < anfdmax; ++fd)
1629 if (anfds [fd].events)
1630 {
1631 anfds [fd].events = 0;
1632 anfds [fd].emask = 0;
1633 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1634 }
1635 }
1636
1637 /* used to prepare libev internal fd's */
1638 /* this is not fork-safe */
1639 inline_speed void
1640 fd_intern (int fd)
1641 {
1642 #ifdef _WIN32
1643 unsigned long arg = 1;
1644 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1645 #else
1646 fcntl (fd, F_SETFD, FD_CLOEXEC);
1647 fcntl (fd, F_SETFL, O_NONBLOCK);
1648 #endif
1649 }
1650
1651 /*****************************************************************************/
1652
1653 /*
1654 * the heap functions want a real array index. array index 0 is guaranteed to not
1655 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1656 * the branching factor of the d-tree.
1657 */
1658
1659 /*
1660 * at the moment we allow libev the luxury of two heaps,
1661 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1662 * which is more cache-efficient.
1663 * the difference is about 5% with 50000+ watchers.
1664 */
1665 #if EV_USE_4HEAP
1666
1667 #define DHEAP 4
1668 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1669 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1670 #define UPHEAP_DONE(p,k) ((p) == (k))
1671
1672 /* away from the root */
1673 inline_speed void
1674 downheap (ANHE *heap, int N, int k)
1675 {
1676 ANHE he = heap [k];
1677 ANHE *E = heap + N + HEAP0;
1678
1679 for (;;)
1680 {
1681 ev_tstamp minat;
1682 ANHE *minpos;
1683 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1684
1685 /* find minimum child */
1686 if (expect_true (pos + DHEAP - 1 < E))
1687 {
1688 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1689 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1690 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1691 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1692 }
1693 else if (pos < E)
1694 {
1695 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1696 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1697 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1698 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1699 }
1700 else
1701 break;
1702
1703 if (ANHE_at (he) <= minat)
1704 break;
1705
1706 heap [k] = *minpos;
1707 ev_active (ANHE_w (*minpos)) = k;
1708
1709 k = minpos - heap;
1710 }
1711
1712 heap [k] = he;
1713 ev_active (ANHE_w (he)) = k;
1714 }
1715
1716 #else /* 4HEAP */
1717
1718 #define HEAP0 1
1719 #define HPARENT(k) ((k) >> 1)
1720 #define UPHEAP_DONE(p,k) (!(p))
1721
1722 /* away from the root */
1723 inline_speed void
1724 downheap (ANHE *heap, int N, int k)
1725 {
1726 ANHE he = heap [k];
1727
1728 for (;;)
1729 {
1730 int c = k << 1;
1731
1732 if (c >= N + HEAP0)
1733 break;
1734
1735 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1736 ? 1 : 0;
1737
1738 if (ANHE_at (he) <= ANHE_at (heap [c]))
1739 break;
1740
1741 heap [k] = heap [c];
1742 ev_active (ANHE_w (heap [k])) = k;
1743
1744 k = c;
1745 }
1746
1747 heap [k] = he;
1748 ev_active (ANHE_w (he)) = k;
1749 }
1750 #endif
1751
1752 /* towards the root */
1753 inline_speed void
1754 upheap (ANHE *heap, int k)
1755 {
1756 ANHE he = heap [k];
1757
1758 for (;;)
1759 {
1760 int p = HPARENT (k);
1761
1762 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1763 break;
1764
1765 heap [k] = heap [p];
1766 ev_active (ANHE_w (heap [k])) = k;
1767 k = p;
1768 }
1769
1770 heap [k] = he;
1771 ev_active (ANHE_w (he)) = k;
1772 }
1773
1774 /* move an element suitably so it is in a correct place */
1775 inline_size void
1776 adjustheap (ANHE *heap, int N, int k)
1777 {
1778 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1779 upheap (heap, k);
1780 else
1781 downheap (heap, N, k);
1782 }
1783
1784 /* rebuild the heap: this function is used only once and executed rarely */
1785 inline_size void
1786 reheap (ANHE *heap, int N)
1787 {
1788 int i;
1789
1790 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1791 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1792 for (i = 0; i < N; ++i)
1793 upheap (heap, i + HEAP0);
1794 }
1795
1796 /*****************************************************************************/
1797
1798 /* associate signal watchers to a signal signal */
1799 typedef struct
1800 {
1801 EV_ATOMIC_T pending;
1802 #if EV_MULTIPLICITY
1803 EV_P;
1804 #endif
1805 WL head;
1806 } ANSIG;
1807
1808 static ANSIG signals [EV_NSIG - 1];
1809
1810 /*****************************************************************************/
1811
1812 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1813
1814 static void noinline ecb_cold
1815 evpipe_init (EV_P)
1816 {
1817 if (!ev_is_active (&pipe_w))
1818 {
1819 # if EV_USE_EVENTFD
1820 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1821 if (evfd < 0 && errno == EINVAL)
1822 evfd = eventfd (0, 0);
1823
1824 if (evfd >= 0)
1825 {
1826 evpipe [0] = -1;
1827 fd_intern (evfd); /* doing it twice doesn't hurt */
1828 ev_io_set (&pipe_w, evfd, EV_READ);
1829 }
1830 else
1831 # endif
1832 {
1833 while (pipe (evpipe))
1834 ev_syserr ("(libev) error creating signal/async pipe");
1835
1836 fd_intern (evpipe [0]);
1837 fd_intern (evpipe [1]);
1838 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1839 }
1840
1841 ev_io_start (EV_A_ &pipe_w);
1842 ev_unref (EV_A); /* watcher should not keep loop alive */
1843 }
1844 }
1845
1846 inline_speed void
1847 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1848 {
1849 ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
1850
1851 if (expect_true (*flag))
1852 return;
1853
1854 *flag = 1;
1855
1856 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1857
1858 pipe_write_skipped = 1;
1859
1860 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1861
1862 if (pipe_write_wanted)
1863 {
1864 int old_errno;
1865
1866 pipe_write_skipped = 0; /* just an optimisation, no fence needed */
1867
1868 old_errno = errno; /* save errno because write will clobber it */
1869
1870 #if EV_USE_EVENTFD
1871 if (evfd >= 0)
1872 {
1873 uint64_t counter = 1;
1874 write (evfd, &counter, sizeof (uint64_t));
1875 }
1876 else
1877 #endif
1878 {
1879 /* win32 people keep sending patches that change this write() to send() */
1880 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1881 /* so when you think this write should be a send instead, please find out */
1882 /* where your send() is from - it's definitely not the microsoft send, and */
1883 /* tell me. thank you. */
1884 /* it might be that your problem is that your environment needs EV_USE_WSASOCKET */
1885 /* check the ev documentation on how to use this flag */
1886 write (evpipe [1], &(evpipe [1]), 1);
1887 }
1888
1889 errno = old_errno;
1890 }
1891 }
1892
1893 /* called whenever the libev signal pipe */
1894 /* got some events (signal, async) */
1895 static void
1896 pipecb (EV_P_ ev_io *iow, int revents)
1897 {
1898 int i;
1899
1900 if (revents & EV_READ)
1901 {
1902 #if EV_USE_EVENTFD
1903 if (evfd >= 0)
1904 {
1905 uint64_t counter;
1906 read (evfd, &counter, sizeof (uint64_t));
1907 }
1908 else
1909 #endif
1910 {
1911 char dummy;
1912 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1913 read (evpipe [0], &dummy, 1);
1914 }
1915 }
1916
1917 pipe_write_skipped = 0;
1918
1919 ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
1920
1921 #if EV_SIGNAL_ENABLE
1922 if (sig_pending)
1923 {
1924 sig_pending = 0;
1925
1926 ECB_MEMORY_FENCE_RELEASE;
1927
1928 for (i = EV_NSIG - 1; i--; )
1929 if (expect_false (signals [i].pending))
1930 ev_feed_signal_event (EV_A_ i + 1);
1931 }
1932 #endif
1933
1934 #if EV_ASYNC_ENABLE
1935 if (async_pending)
1936 {
1937 async_pending = 0;
1938
1939 ECB_MEMORY_FENCE_RELEASE;
1940
1941 for (i = asynccnt; i--; )
1942 if (asyncs [i]->sent)
1943 {
1944 asyncs [i]->sent = 0;
1945 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1946 }
1947 }
1948 #endif
1949 }
1950
1951 /*****************************************************************************/
1952
1953 void
1954 ev_feed_signal (int signum) EV_THROW
1955 {
1956 #if EV_MULTIPLICITY
1957 EV_P = signals [signum - 1].loop;
1958
1959 if (!EV_A)
1960 return;
1961 #endif
1962
1963 if (!ev_active (&pipe_w))
1964 return;
1965
1966 signals [signum - 1].pending = 1;
1967 evpipe_write (EV_A_ &sig_pending);
1968 }
1969
1970 static void
1971 ev_sighandler (int signum)
1972 {
1973 #ifdef _WIN32
1974 signal (signum, ev_sighandler);
1975 #endif
1976
1977 ev_feed_signal (signum);
1978 }
1979
1980 void noinline
1981 ev_feed_signal_event (EV_P_ int signum) EV_THROW
1982 {
1983 WL w;
1984
1985 if (expect_false (signum <= 0 || signum > EV_NSIG))
1986 return;
1987
1988 --signum;
1989
1990 #if EV_MULTIPLICITY
1991 /* it is permissible to try to feed a signal to the wrong loop */
1992 /* or, likely more useful, feeding a signal nobody is waiting for */
1993
1994 if (expect_false (signals [signum].loop != EV_A))
1995 return;
1996 #endif
1997
1998 signals [signum].pending = 0;
1999
2000 for (w = signals [signum].head; w; w = w->next)
2001 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2002 }
2003
2004 #if EV_USE_SIGNALFD
2005 static void
2006 sigfdcb (EV_P_ ev_io *iow, int revents)
2007 {
2008 struct signalfd_siginfo si[2], *sip; /* these structs are big */
2009
2010 for (;;)
2011 {
2012 ssize_t res = read (sigfd, si, sizeof (si));
2013
2014 /* not ISO-C, as res might be -1, but works with SuS */
2015 for (sip = si; (char *)sip < (char *)si + res; ++sip)
2016 ev_feed_signal_event (EV_A_ sip->ssi_signo);
2017
2018 if (res < (ssize_t)sizeof (si))
2019 break;
2020 }
2021 }
2022 #endif
2023
2024 #endif
2025
2026 /*****************************************************************************/
2027
2028 #if EV_CHILD_ENABLE
2029 static WL childs [EV_PID_HASHSIZE];
2030
2031 static ev_signal childev;
2032
2033 #ifndef WIFCONTINUED
2034 # define WIFCONTINUED(status) 0
2035 #endif
2036
2037 /* handle a single child status event */
2038 inline_speed void
2039 child_reap (EV_P_ int chain, int pid, int status)
2040 {
2041 ev_child *w;
2042 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2043
2044 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2045 {
2046 if ((w->pid == pid || !w->pid)
2047 && (!traced || (w->flags & 1)))
2048 {
2049 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2050 w->rpid = pid;
2051 w->rstatus = status;
2052 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2053 }
2054 }
2055 }
2056
2057 #ifndef WCONTINUED
2058 # define WCONTINUED 0
2059 #endif
2060
2061 /* called on sigchld etc., calls waitpid */
2062 static void
2063 childcb (EV_P_ ev_signal *sw, int revents)
2064 {
2065 int pid, status;
2066
2067 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
2068 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
2069 if (!WCONTINUED
2070 || errno != EINVAL
2071 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2072 return;
2073
2074 /* make sure we are called again until all children have been reaped */
2075 /* we need to do it this way so that the callback gets called before we continue */
2076 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2077
2078 child_reap (EV_A_ pid, pid, status);
2079 if ((EV_PID_HASHSIZE) > 1)
2080 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2081 }
2082
2083 #endif
2084
2085 /*****************************************************************************/
2086
2087 #if EV_USE_IOCP
2088 # include "ev_iocp.c"
2089 #endif
2090 #if EV_USE_PORT
2091 # include "ev_port.c"
2092 #endif
2093 #if EV_USE_KQUEUE
2094 # include "ev_kqueue.c"
2095 #endif
2096 #if EV_USE_EPOLL
2097 # include "ev_epoll.c"
2098 #endif
2099 #if EV_USE_POLL
2100 # include "ev_poll.c"
2101 #endif
2102 #if EV_USE_SELECT
2103 # include "ev_select.c"
2104 #endif
2105
2106 int ecb_cold
2107 ev_version_major (void) EV_THROW
2108 {
2109 return EV_VERSION_MAJOR;
2110 }
2111
2112 int ecb_cold
2113 ev_version_minor (void) EV_THROW
2114 {
2115 return EV_VERSION_MINOR;
2116 }
2117
2118 /* return true if we are running with elevated privileges and should ignore env variables */
2119 int inline_size ecb_cold
2120 enable_secure (void)
2121 {
2122 #ifdef _WIN32
2123 return 0;
2124 #else
2125 return getuid () != geteuid ()
2126 || getgid () != getegid ();
2127 #endif
2128 }
2129
2130 unsigned int ecb_cold
2131 ev_supported_backends (void) EV_THROW
2132 {
2133 unsigned int flags = 0;
2134
2135 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2136 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2137 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2138 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2139 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2140
2141 return flags;
2142 }
2143
2144 unsigned int ecb_cold
2145 ev_recommended_backends (void) EV_THROW
2146 {
2147 unsigned int flags = ev_supported_backends ();
2148
2149 #ifndef __NetBSD__
2150 /* kqueue is borked on everything but netbsd apparently */
2151 /* it usually doesn't work correctly on anything but sockets and pipes */
2152 flags &= ~EVBACKEND_KQUEUE;
2153 #endif
2154 #ifdef __APPLE__
2155 /* only select works correctly on that "unix-certified" platform */
2156 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2157 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2158 #endif
2159 #ifdef __FreeBSD__
2160 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2161 #endif
2162
2163 return flags;
2164 }
2165
2166 unsigned int ecb_cold
2167 ev_embeddable_backends (void) EV_THROW
2168 {
2169 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2170
2171 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2172 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2173 flags &= ~EVBACKEND_EPOLL;
2174
2175 return flags;
2176 }
2177
2178 unsigned int
2179 ev_backend (EV_P) EV_THROW
2180 {
2181 return backend;
2182 }
2183
2184 #if EV_FEATURE_API
2185 unsigned int
2186 ev_iteration (EV_P) EV_THROW
2187 {
2188 return loop_count;
2189 }
2190
2191 unsigned int
2192 ev_depth (EV_P) EV_THROW
2193 {
2194 return loop_depth;
2195 }
2196
2197 void
2198 ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2199 {
2200 io_blocktime = interval;
2201 }
2202
2203 void
2204 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2205 {
2206 timeout_blocktime = interval;
2207 }
2208
2209 void
2210 ev_set_userdata (EV_P_ void *data) EV_THROW
2211 {
2212 userdata = data;
2213 }
2214
2215 void *
2216 ev_userdata (EV_P) EV_THROW
2217 {
2218 return userdata;
2219 }
2220
2221 void
2222 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) EV_THROW
2223 {
2224 invoke_cb = invoke_pending_cb;
2225 }
2226
2227 void
2228 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
2229 {
2230 release_cb = release;
2231 acquire_cb = acquire;
2232 }
2233 #endif
2234
2235 /* initialise a loop structure, must be zero-initialised */
2236 static void noinline ecb_cold
2237 loop_init (EV_P_ unsigned int flags) EV_THROW
2238 {
2239 if (!backend)
2240 {
2241 origflags = flags;
2242
2243 #if EV_USE_REALTIME
2244 if (!have_realtime)
2245 {
2246 struct timespec ts;
2247
2248 if (!clock_gettime (CLOCK_REALTIME, &ts))
2249 have_realtime = 1;
2250 }
2251 #endif
2252
2253 #if EV_USE_MONOTONIC
2254 if (!have_monotonic)
2255 {
2256 struct timespec ts;
2257
2258 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2259 have_monotonic = 1;
2260 }
2261 #endif
2262
2263 /* pid check not overridable via env */
2264 #ifndef _WIN32
2265 if (flags & EVFLAG_FORKCHECK)
2266 curpid = getpid ();
2267 #endif
2268
2269 if (!(flags & EVFLAG_NOENV)
2270 && !enable_secure ()
2271 && getenv ("LIBEV_FLAGS"))
2272 flags = atoi (getenv ("LIBEV_FLAGS"));
2273
2274 ev_rt_now = ev_time ();
2275 mn_now = get_clock ();
2276 now_floor = mn_now;
2277 rtmn_diff = ev_rt_now - mn_now;
2278 #if EV_FEATURE_API
2279 invoke_cb = ev_invoke_pending;
2280 #endif
2281
2282 io_blocktime = 0.;
2283 timeout_blocktime = 0.;
2284 backend = 0;
2285 backend_fd = -1;
2286 sig_pending = 0;
2287 #if EV_ASYNC_ENABLE
2288 async_pending = 0;
2289 #endif
2290 pipe_write_skipped = 0;
2291 pipe_write_wanted = 0;
2292 #if EV_USE_INOTIFY
2293 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2294 #endif
2295 #if EV_USE_SIGNALFD
2296 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2297 #endif
2298
2299 if (!(flags & EVBACKEND_MASK))
2300 flags |= ev_recommended_backends ();
2301
2302 #if EV_USE_IOCP
2303 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2304 #endif
2305 #if EV_USE_PORT
2306 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2307 #endif
2308 #if EV_USE_KQUEUE
2309 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2310 #endif
2311 #if EV_USE_EPOLL
2312 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2313 #endif
2314 #if EV_USE_POLL
2315 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2316 #endif
2317 #if EV_USE_SELECT
2318 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2319 #endif
2320
2321 ev_prepare_init (&pending_w, pendingcb);
2322
2323 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2324 ev_init (&pipe_w, pipecb);
2325 ev_set_priority (&pipe_w, EV_MAXPRI);
2326 #endif
2327 }
2328 }
2329
2330 /* free up a loop structure */
2331 void ecb_cold
2332 ev_loop_destroy (EV_P)
2333 {
2334 int i;
2335
2336 #if EV_MULTIPLICITY
2337 /* mimic free (0) */
2338 if (!EV_A)
2339 return;
2340 #endif
2341
2342 #if EV_CLEANUP_ENABLE
2343 /* queue cleanup watchers (and execute them) */
2344 if (expect_false (cleanupcnt))
2345 {
2346 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2347 EV_INVOKE_PENDING;
2348 }
2349 #endif
2350
2351 #if EV_CHILD_ENABLE
2352 if (ev_is_active (&childev))
2353 {
2354 ev_ref (EV_A); /* child watcher */
2355 ev_signal_stop (EV_A_ &childev);
2356 }
2357 #endif
2358
2359 if (ev_is_active (&pipe_w))
2360 {
2361 /*ev_ref (EV_A);*/
2362 /*ev_io_stop (EV_A_ &pipe_w);*/
2363
2364 #if EV_USE_EVENTFD
2365 if (evfd >= 0)
2366 close (evfd);
2367 #endif
2368
2369 if (evpipe [0] >= 0)
2370 {
2371 EV_WIN32_CLOSE_FD (evpipe [0]);
2372 EV_WIN32_CLOSE_FD (evpipe [1]);
2373 }
2374 }
2375
2376 #if EV_USE_SIGNALFD
2377 if (ev_is_active (&sigfd_w))
2378 close (sigfd);
2379 #endif
2380
2381 #if EV_USE_INOTIFY
2382 if (fs_fd >= 0)
2383 close (fs_fd);
2384 #endif
2385
2386 if (backend_fd >= 0)
2387 close (backend_fd);
2388
2389 #if EV_USE_IOCP
2390 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2391 #endif
2392 #if EV_USE_PORT
2393 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2394 #endif
2395 #if EV_USE_KQUEUE
2396 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2397 #endif
2398 #if EV_USE_EPOLL
2399 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2400 #endif
2401 #if EV_USE_POLL
2402 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2403 #endif
2404 #if EV_USE_SELECT
2405 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2406 #endif
2407
2408 for (i = NUMPRI; i--; )
2409 {
2410 array_free (pending, [i]);
2411 #if EV_IDLE_ENABLE
2412 array_free (idle, [i]);
2413 #endif
2414 }
2415
2416 ev_free (anfds); anfds = 0; anfdmax = 0;
2417
2418 /* have to use the microsoft-never-gets-it-right macro */
2419 array_free (rfeed, EMPTY);
2420 array_free (fdchange, EMPTY);
2421 array_free (timer, EMPTY);
2422 #if EV_PERIODIC_ENABLE
2423 array_free (periodic, EMPTY);
2424 #endif
2425 #if EV_FORK_ENABLE
2426 array_free (fork, EMPTY);
2427 #endif
2428 #if EV_CLEANUP_ENABLE
2429 array_free (cleanup, EMPTY);
2430 #endif
2431 array_free (prepare, EMPTY);
2432 array_free (check, EMPTY);
2433 #if EV_ASYNC_ENABLE
2434 array_free (async, EMPTY);
2435 #endif
2436
2437 backend = 0;
2438
2439 #if EV_MULTIPLICITY
2440 if (ev_is_default_loop (EV_A))
2441 #endif
2442 ev_default_loop_ptr = 0;
2443 #if EV_MULTIPLICITY
2444 else
2445 ev_free (EV_A);
2446 #endif
2447 }
2448
2449 #if EV_USE_INOTIFY
2450 inline_size void infy_fork (EV_P);
2451 #endif
2452
2453 inline_size void
2454 loop_fork (EV_P)
2455 {
2456 #if EV_USE_PORT
2457 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2458 #endif
2459 #if EV_USE_KQUEUE
2460 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2461 #endif
2462 #if EV_USE_EPOLL
2463 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2464 #endif
2465 #if EV_USE_INOTIFY
2466 infy_fork (EV_A);
2467 #endif
2468
2469 if (ev_is_active (&pipe_w))
2470 {
2471 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2472
2473 ev_ref (EV_A);
2474 ev_io_stop (EV_A_ &pipe_w);
2475
2476 #if EV_USE_EVENTFD
2477 if (evfd >= 0)
2478 close (evfd);
2479 #endif
2480
2481 if (evpipe [0] >= 0)
2482 {
2483 EV_WIN32_CLOSE_FD (evpipe [0]);
2484 EV_WIN32_CLOSE_FD (evpipe [1]);
2485 }
2486
2487 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2488 evpipe_init (EV_A);
2489 /* now iterate over everything, in case we missed something */
2490 pipecb (EV_A_ &pipe_w, EV_READ);
2491 #endif
2492 }
2493
2494 postfork = 0;
2495 }
2496
2497 #if EV_MULTIPLICITY
2498
2499 struct ev_loop * ecb_cold
2500 ev_loop_new (unsigned int flags) EV_THROW
2501 {
2502 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2503
2504 memset (EV_A, 0, sizeof (struct ev_loop));
2505 loop_init (EV_A_ flags);
2506
2507 if (ev_backend (EV_A))
2508 return EV_A;
2509
2510 ev_free (EV_A);
2511 return 0;
2512 }
2513
2514 #endif /* multiplicity */
2515
2516 #if EV_VERIFY
2517 static void noinline ecb_cold
2518 verify_watcher (EV_P_ W w)
2519 {
2520 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2521
2522 if (w->pending)
2523 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2524 }
2525
2526 static void noinline ecb_cold
2527 verify_heap (EV_P_ ANHE *heap, int N)
2528 {
2529 int i;
2530
2531 for (i = HEAP0; i < N + HEAP0; ++i)
2532 {
2533 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2534 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2535 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2536
2537 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2538 }
2539 }
2540
2541 static void noinline ecb_cold
2542 array_verify (EV_P_ W *ws, int cnt)
2543 {
2544 while (cnt--)
2545 {
2546 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2547 verify_watcher (EV_A_ ws [cnt]);
2548 }
2549 }
2550 #endif
2551
2552 #if EV_FEATURE_API
2553 void ecb_cold
2554 ev_verify (EV_P) EV_THROW
2555 {
2556 #if EV_VERIFY
2557 int i;
2558 WL w;
2559
2560 assert (activecnt >= -1);
2561
2562 assert (fdchangemax >= fdchangecnt);
2563 for (i = 0; i < fdchangecnt; ++i)
2564 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2565
2566 assert (anfdmax >= 0);
2567 for (i = 0; i < anfdmax; ++i)
2568 for (w = anfds [i].head; w; w = w->next)
2569 {
2570 verify_watcher (EV_A_ (W)w);
2571 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2572 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2573 }
2574
2575 assert (timermax >= timercnt);
2576 verify_heap (EV_A_ timers, timercnt);
2577
2578 #if EV_PERIODIC_ENABLE
2579 assert (periodicmax >= periodiccnt);
2580 verify_heap (EV_A_ periodics, periodiccnt);
2581 #endif
2582
2583 for (i = NUMPRI; i--; )
2584 {
2585 assert (pendingmax [i] >= pendingcnt [i]);
2586 #if EV_IDLE_ENABLE
2587 assert (idleall >= 0);
2588 assert (idlemax [i] >= idlecnt [i]);
2589 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2590 #endif
2591 }
2592
2593 #if EV_FORK_ENABLE
2594 assert (forkmax >= forkcnt);
2595 array_verify (EV_A_ (W *)forks, forkcnt);
2596 #endif
2597
2598 #if EV_CLEANUP_ENABLE
2599 assert (cleanupmax >= cleanupcnt);
2600 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2601 #endif
2602
2603 #if EV_ASYNC_ENABLE
2604 assert (asyncmax >= asynccnt);
2605 array_verify (EV_A_ (W *)asyncs, asynccnt);
2606 #endif
2607
2608 #if EV_PREPARE_ENABLE
2609 assert (preparemax >= preparecnt);
2610 array_verify (EV_A_ (W *)prepares, preparecnt);
2611 #endif
2612
2613 #if EV_CHECK_ENABLE
2614 assert (checkmax >= checkcnt);
2615 array_verify (EV_A_ (W *)checks, checkcnt);
2616 #endif
2617
2618 # if 0
2619 #if EV_CHILD_ENABLE
2620 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2621 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2622 #endif
2623 # endif
2624 #endif
2625 }
2626 #endif
2627
2628 #if EV_MULTIPLICITY
2629 struct ev_loop * ecb_cold
2630 #else
2631 int
2632 #endif
2633 ev_default_loop (unsigned int flags) EV_THROW
2634 {
2635 if (!ev_default_loop_ptr)
2636 {
2637 #if EV_MULTIPLICITY
2638 EV_P = ev_default_loop_ptr = &default_loop_struct;
2639 #else
2640 ev_default_loop_ptr = 1;
2641 #endif
2642
2643 loop_init (EV_A_ flags);
2644
2645 if (ev_backend (EV_A))
2646 {
2647 #if EV_CHILD_ENABLE
2648 ev_signal_init (&childev, childcb, SIGCHLD);
2649 ev_set_priority (&childev, EV_MAXPRI);
2650 ev_signal_start (EV_A_ &childev);
2651 ev_unref (EV_A); /* child watcher should not keep loop alive */
2652 #endif
2653 }
2654 else
2655 ev_default_loop_ptr = 0;
2656 }
2657
2658 return ev_default_loop_ptr;
2659 }
2660
2661 void
2662 ev_loop_fork (EV_P) EV_THROW
2663 {
2664 postfork = 1; /* must be in line with ev_default_fork */
2665 }
2666
2667 /*****************************************************************************/
2668
2669 void
2670 ev_invoke (EV_P_ void *w, int revents)
2671 {
2672 EV_CB_INVOKE ((W)w, revents);
2673 }
2674
2675 unsigned int
2676 ev_pending_count (EV_P) EV_THROW
2677 {
2678 int pri;
2679 unsigned int count = 0;
2680
2681 for (pri = NUMPRI; pri--; )
2682 count += pendingcnt [pri];
2683
2684 return count;
2685 }
2686
2687 void noinline
2688 ev_invoke_pending (EV_P)
2689 {
2690 int pri;
2691
2692 for (pri = NUMPRI; pri--; )
2693 while (pendingcnt [pri])
2694 {
2695 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2696
2697 p->w->pending = 0;
2698 EV_CB_INVOKE (p->w, p->events);
2699 EV_FREQUENT_CHECK;
2700 }
2701 }
2702
2703 #if EV_IDLE_ENABLE
2704 /* make idle watchers pending. this handles the "call-idle */
2705 /* only when higher priorities are idle" logic */
2706 inline_size void
2707 idle_reify (EV_P)
2708 {
2709 if (expect_false (idleall))
2710 {
2711 int pri;
2712
2713 for (pri = NUMPRI; pri--; )
2714 {
2715 if (pendingcnt [pri])
2716 break;
2717
2718 if (idlecnt [pri])
2719 {
2720 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2721 break;
2722 }
2723 }
2724 }
2725 }
2726 #endif
2727
2728 /* make timers pending */
2729 inline_size void
2730 timers_reify (EV_P)
2731 {
2732 EV_FREQUENT_CHECK;
2733
2734 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2735 {
2736 do
2737 {
2738 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2739
2740 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2741
2742 /* first reschedule or stop timer */
2743 if (w->repeat)
2744 {
2745 ev_at (w) += w->repeat;
2746 if (ev_at (w) < mn_now)
2747 ev_at (w) = mn_now;
2748
2749 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2750
2751 ANHE_at_cache (timers [HEAP0]);
2752 downheap (timers, timercnt, HEAP0);
2753 }
2754 else
2755 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2756
2757 EV_FREQUENT_CHECK;
2758 feed_reverse (EV_A_ (W)w);
2759 }
2760 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2761
2762 feed_reverse_done (EV_A_ EV_TIMER);
2763 }
2764 }
2765
2766 #if EV_PERIODIC_ENABLE
2767
2768 static void noinline
2769 periodic_recalc (EV_P_ ev_periodic *w)
2770 {
2771 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2772 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2773
2774 /* the above almost always errs on the low side */
2775 while (at <= ev_rt_now)
2776 {
2777 ev_tstamp nat = at + w->interval;
2778
2779 /* when resolution fails us, we use ev_rt_now */
2780 if (expect_false (nat == at))
2781 {
2782 at = ev_rt_now;
2783 break;
2784 }
2785
2786 at = nat;
2787 }
2788
2789 ev_at (w) = at;
2790 }
2791
2792 /* make periodics pending */
2793 inline_size void
2794 periodics_reify (EV_P)
2795 {
2796 EV_FREQUENT_CHECK;
2797
2798 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2799 {
2800 int feed_count = 0;
2801
2802 do
2803 {
2804 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2805
2806 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2807
2808 /* first reschedule or stop timer */
2809 if (w->reschedule_cb)
2810 {
2811 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2812
2813 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2814
2815 ANHE_at_cache (periodics [HEAP0]);
2816 downheap (periodics, periodiccnt, HEAP0);
2817 }
2818 else if (w->interval)
2819 {
2820 periodic_recalc (EV_A_ w);
2821 ANHE_at_cache (periodics [HEAP0]);
2822 downheap (periodics, periodiccnt, HEAP0);
2823 }
2824 else
2825 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2826
2827 EV_FREQUENT_CHECK;
2828 feed_reverse (EV_A_ (W)w);
2829 }
2830 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2831
2832 feed_reverse_done (EV_A_ EV_PERIODIC);
2833 }
2834 }
2835
2836 /* simply recalculate all periodics */
2837 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2838 static void noinline ecb_cold
2839 periodics_reschedule (EV_P)
2840 {
2841 int i;
2842
2843 /* adjust periodics after time jump */
2844 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2845 {
2846 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2847
2848 if (w->reschedule_cb)
2849 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2850 else if (w->interval)
2851 periodic_recalc (EV_A_ w);
2852
2853 ANHE_at_cache (periodics [i]);
2854 }
2855
2856 reheap (periodics, periodiccnt);
2857 }
2858 #endif
2859
2860 /* adjust all timers by a given offset */
2861 static void noinline ecb_cold
2862 timers_reschedule (EV_P_ ev_tstamp adjust)
2863 {
2864 int i;
2865
2866 for (i = 0; i < timercnt; ++i)
2867 {
2868 ANHE *he = timers + i + HEAP0;
2869 ANHE_w (*he)->at += adjust;
2870 ANHE_at_cache (*he);
2871 }
2872 }
2873
2874 /* fetch new monotonic and realtime times from the kernel */
2875 /* also detect if there was a timejump, and act accordingly */
2876 inline_speed void
2877 time_update (EV_P_ ev_tstamp max_block)
2878 {
2879 #if EV_USE_MONOTONIC
2880 if (expect_true (have_monotonic))
2881 {
2882 int i;
2883 ev_tstamp odiff = rtmn_diff;
2884
2885 mn_now = get_clock ();
2886
2887 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2888 /* interpolate in the meantime */
2889 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2890 {
2891 ev_rt_now = rtmn_diff + mn_now;
2892 return;
2893 }
2894
2895 now_floor = mn_now;
2896 ev_rt_now = ev_time ();
2897
2898 /* loop a few times, before making important decisions.
2899 * on the choice of "4": one iteration isn't enough,
2900 * in case we get preempted during the calls to
2901 * ev_time and get_clock. a second call is almost guaranteed
2902 * to succeed in that case, though. and looping a few more times
2903 * doesn't hurt either as we only do this on time-jumps or
2904 * in the unlikely event of having been preempted here.
2905 */
2906 for (i = 4; --i; )
2907 {
2908 ev_tstamp diff;
2909 rtmn_diff = ev_rt_now - mn_now;
2910
2911 diff = odiff - rtmn_diff;
2912
2913 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2914 return; /* all is well */
2915
2916 ev_rt_now = ev_time ();
2917 mn_now = get_clock ();
2918 now_floor = mn_now;
2919 }
2920
2921 /* no timer adjustment, as the monotonic clock doesn't jump */
2922 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2923 # if EV_PERIODIC_ENABLE
2924 periodics_reschedule (EV_A);
2925 # endif
2926 }
2927 else
2928 #endif
2929 {
2930 ev_rt_now = ev_time ();
2931
2932 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2933 {
2934 /* adjust timers. this is easy, as the offset is the same for all of them */
2935 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2936 #if EV_PERIODIC_ENABLE
2937 periodics_reschedule (EV_A);
2938 #endif
2939 }
2940
2941 mn_now = ev_rt_now;
2942 }
2943 }
2944
2945 int
2946 ev_run (EV_P_ int flags)
2947 {
2948 #if EV_FEATURE_API
2949 ++loop_depth;
2950 #endif
2951
2952 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2953
2954 loop_done = EVBREAK_CANCEL;
2955
2956 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2957
2958 do
2959 {
2960 #if EV_VERIFY >= 2
2961 ev_verify (EV_A);
2962 #endif
2963
2964 #ifndef _WIN32
2965 if (expect_false (curpid)) /* penalise the forking check even more */
2966 if (expect_false (getpid () != curpid))
2967 {
2968 curpid = getpid ();
2969 postfork = 1;
2970 }
2971 #endif
2972
2973 #if EV_FORK_ENABLE
2974 /* we might have forked, so queue fork handlers */
2975 if (expect_false (postfork))
2976 if (forkcnt)
2977 {
2978 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2979 EV_INVOKE_PENDING;
2980 }
2981 #endif
2982
2983 #if EV_PREPARE_ENABLE
2984 /* queue prepare watchers (and execute them) */
2985 if (expect_false (preparecnt))
2986 {
2987 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2988 EV_INVOKE_PENDING;
2989 }
2990 #endif
2991
2992 if (expect_false (loop_done))
2993 break;
2994
2995 /* we might have forked, so reify kernel state if necessary */
2996 if (expect_false (postfork))
2997 loop_fork (EV_A);
2998
2999 /* update fd-related kernel structures */
3000 fd_reify (EV_A);
3001
3002 /* calculate blocking time */
3003 {
3004 ev_tstamp waittime = 0.;
3005 ev_tstamp sleeptime = 0.;
3006
3007 /* remember old timestamp for io_blocktime calculation */
3008 ev_tstamp prev_mn_now = mn_now;
3009
3010 /* update time to cancel out callback processing overhead */
3011 time_update (EV_A_ 1e100);
3012
3013 /* from now on, we want a pipe-wake-up */
3014 pipe_write_wanted = 1;
3015
3016 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3017
3018 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3019 {
3020 waittime = MAX_BLOCKTIME;
3021
3022 if (timercnt)
3023 {
3024 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3025 if (waittime > to) waittime = to;
3026 }
3027
3028 #if EV_PERIODIC_ENABLE
3029 if (periodiccnt)
3030 {
3031 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3032 if (waittime > to) waittime = to;
3033 }
3034 #endif
3035
3036 /* don't let timeouts decrease the waittime below timeout_blocktime */
3037 if (expect_false (waittime < timeout_blocktime))
3038 waittime = timeout_blocktime;
3039
3040 /* at this point, we NEED to wait, so we have to ensure */
3041 /* to pass a minimum nonzero value to the backend */
3042 if (expect_false (waittime < backend_mintime))
3043 waittime = backend_mintime;
3044
3045 /* extra check because io_blocktime is commonly 0 */
3046 if (expect_false (io_blocktime))
3047 {
3048 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3049
3050 if (sleeptime > waittime - backend_mintime)
3051 sleeptime = waittime - backend_mintime;
3052
3053 if (expect_true (sleeptime > 0.))
3054 {
3055 ev_sleep (sleeptime);
3056 waittime -= sleeptime;
3057 }
3058 }
3059 }
3060
3061 #if EV_FEATURE_API
3062 ++loop_count;
3063 #endif
3064 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3065 backend_poll (EV_A_ waittime);
3066 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3067
3068 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3069
3070 if (pipe_write_skipped)
3071 {
3072 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3073 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3074 }
3075
3076
3077 /* update ev_rt_now, do magic */
3078 time_update (EV_A_ waittime + sleeptime);
3079 }
3080
3081 /* queue pending timers and reschedule them */
3082 timers_reify (EV_A); /* relative timers called last */
3083 #if EV_PERIODIC_ENABLE
3084 periodics_reify (EV_A); /* absolute timers called first */
3085 #endif
3086
3087 #if EV_IDLE_ENABLE
3088 /* queue idle watchers unless other events are pending */
3089 idle_reify (EV_A);
3090 #endif
3091
3092 #if EV_CHECK_ENABLE
3093 /* queue check watchers, to be executed first */
3094 if (expect_false (checkcnt))
3095 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3096 #endif
3097
3098 EV_INVOKE_PENDING;
3099 }
3100 while (expect_true (
3101 activecnt
3102 && !loop_done
3103 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3104 ));
3105
3106 if (loop_done == EVBREAK_ONE)
3107 loop_done = EVBREAK_CANCEL;
3108
3109 #if EV_FEATURE_API
3110 --loop_depth;
3111 #endif
3112
3113 return activecnt;
3114 }
3115
3116 void
3117 ev_break (EV_P_ int how) EV_THROW
3118 {
3119 loop_done = how;
3120 }
3121
3122 void
3123 ev_ref (EV_P) EV_THROW
3124 {
3125 ++activecnt;
3126 }
3127
3128 void
3129 ev_unref (EV_P) EV_THROW
3130 {
3131 --activecnt;
3132 }
3133
3134 void
3135 ev_now_update (EV_P) EV_THROW
3136 {
3137 time_update (EV_A_ 1e100);
3138 }
3139
3140 void
3141 ev_suspend (EV_P) EV_THROW
3142 {
3143 ev_now_update (EV_A);
3144 }
3145
3146 void
3147 ev_resume (EV_P) EV_THROW
3148 {
3149 ev_tstamp mn_prev = mn_now;
3150
3151 ev_now_update (EV_A);
3152 timers_reschedule (EV_A_ mn_now - mn_prev);
3153 #if EV_PERIODIC_ENABLE
3154 /* TODO: really do this? */
3155 periodics_reschedule (EV_A);
3156 #endif
3157 }
3158
3159 /*****************************************************************************/
3160 /* singly-linked list management, used when the expected list length is short */
3161
3162 inline_size void
3163 wlist_add (WL *head, WL elem)
3164 {
3165 elem->next = *head;
3166 *head = elem;
3167 }
3168
3169 inline_size void
3170 wlist_del (WL *head, WL elem)
3171 {
3172 while (*head)
3173 {
3174 if (expect_true (*head == elem))
3175 {
3176 *head = elem->next;
3177 break;
3178 }
3179
3180 head = &(*head)->next;
3181 }
3182 }
3183
3184 /* internal, faster, version of ev_clear_pending */
3185 inline_speed void
3186 clear_pending (EV_P_ W w)
3187 {
3188 if (w->pending)
3189 {
3190 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3191 w->pending = 0;
3192 }
3193 }
3194
3195 int
3196 ev_clear_pending (EV_P_ void *w) EV_THROW
3197 {
3198 W w_ = (W)w;
3199 int pending = w_->pending;
3200
3201 if (expect_true (pending))
3202 {
3203 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3204 p->w = (W)&pending_w;
3205 w_->pending = 0;
3206 return p->events;
3207 }
3208 else
3209 return 0;
3210 }
3211
3212 inline_size void
3213 pri_adjust (EV_P_ W w)
3214 {
3215 int pri = ev_priority (w);
3216 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3217 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3218 ev_set_priority (w, pri);
3219 }
3220
3221 inline_speed void
3222 ev_start (EV_P_ W w, int active)
3223 {
3224 pri_adjust (EV_A_ w);
3225 w->active = active;
3226 ev_ref (EV_A);
3227 }
3228
3229 inline_size void
3230 ev_stop (EV_P_ W w)
3231 {
3232 ev_unref (EV_A);
3233 w->active = 0;
3234 }
3235
3236 /*****************************************************************************/
3237
3238 void noinline
3239 ev_io_start (EV_P_ ev_io *w) EV_THROW
3240 {
3241 int fd = w->fd;
3242
3243 if (expect_false (ev_is_active (w)))
3244 return;
3245
3246 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3247 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3248
3249 EV_FREQUENT_CHECK;
3250
3251 ev_start (EV_A_ (W)w, 1);
3252 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3253 wlist_add (&anfds[fd].head, (WL)w);
3254
3255 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3256 w->events &= ~EV__IOFDSET;
3257
3258 EV_FREQUENT_CHECK;
3259 }
3260
3261 void noinline
3262 ev_io_stop (EV_P_ ev_io *w) EV_THROW
3263 {
3264 clear_pending (EV_A_ (W)w);
3265 if (expect_false (!ev_is_active (w)))
3266 return;
3267
3268 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3269
3270 EV_FREQUENT_CHECK;
3271
3272 wlist_del (&anfds[w->fd].head, (WL)w);
3273 ev_stop (EV_A_ (W)w);
3274
3275 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3276
3277 EV_FREQUENT_CHECK;
3278 }
3279
3280 void noinline
3281 ev_timer_start (EV_P_ ev_timer *w) EV_THROW
3282 {
3283 if (expect_false (ev_is_active (w)))
3284 return;
3285
3286 ev_at (w) += mn_now;
3287
3288 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3289
3290 EV_FREQUENT_CHECK;
3291
3292 ++timercnt;
3293 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3294 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3295 ANHE_w (timers [ev_active (w)]) = (WT)w;
3296 ANHE_at_cache (timers [ev_active (w)]);
3297 upheap (timers, ev_active (w));
3298
3299 EV_FREQUENT_CHECK;
3300
3301 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3302 }
3303
3304 void noinline
3305 ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
3306 {
3307 clear_pending (EV_A_ (W)w);
3308 if (expect_false (!ev_is_active (w)))
3309 return;
3310
3311 EV_FREQUENT_CHECK;
3312
3313 {
3314 int active = ev_active (w);
3315
3316 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3317
3318 --timercnt;
3319
3320 if (expect_true (active < timercnt + HEAP0))
3321 {
3322 timers [active] = timers [timercnt + HEAP0];
3323 adjustheap (timers, timercnt, active);
3324 }
3325 }
3326
3327 ev_at (w) -= mn_now;
3328
3329 ev_stop (EV_A_ (W)w);
3330
3331 EV_FREQUENT_CHECK;
3332 }
3333
3334 void noinline
3335 ev_timer_again (EV_P_ ev_timer *w) EV_THROW
3336 {
3337 EV_FREQUENT_CHECK;
3338
3339 clear_pending (EV_A_ (W)w);
3340
3341 if (ev_is_active (w))
3342 {
3343 if (w->repeat)
3344 {
3345 ev_at (w) = mn_now + w->repeat;
3346 ANHE_at_cache (timers [ev_active (w)]);
3347 adjustheap (timers, timercnt, ev_active (w));
3348 }
3349 else
3350 ev_timer_stop (EV_A_ w);
3351 }
3352 else if (w->repeat)
3353 {
3354 ev_at (w) = w->repeat;
3355 ev_timer_start (EV_A_ w);
3356 }
3357
3358 EV_FREQUENT_CHECK;
3359 }
3360
3361 ev_tstamp
3362 ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
3363 {
3364 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3365 }
3366
3367 #if EV_PERIODIC_ENABLE
3368 void noinline
3369 ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
3370 {
3371 if (expect_false (ev_is_active (w)))
3372 return;
3373
3374 if (w->reschedule_cb)
3375 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3376 else if (w->interval)
3377 {
3378 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3379 periodic_recalc (EV_A_ w);
3380 }
3381 else
3382 ev_at (w) = w->offset;
3383
3384 EV_FREQUENT_CHECK;
3385
3386 ++periodiccnt;
3387 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3388 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3389 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3390 ANHE_at_cache (periodics [ev_active (w)]);
3391 upheap (periodics, ev_active (w));
3392
3393 EV_FREQUENT_CHECK;
3394
3395 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3396 }
3397
3398 void noinline
3399 ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
3400 {
3401 clear_pending (EV_A_ (W)w);
3402 if (expect_false (!ev_is_active (w)))
3403 return;
3404
3405 EV_FREQUENT_CHECK;
3406
3407 {
3408 int active = ev_active (w);
3409
3410 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3411
3412 --periodiccnt;
3413
3414 if (expect_true (active < periodiccnt + HEAP0))
3415 {
3416 periodics [active] = periodics [periodiccnt + HEAP0];
3417 adjustheap (periodics, periodiccnt, active);
3418 }
3419 }
3420
3421 ev_stop (EV_A_ (W)w);
3422
3423 EV_FREQUENT_CHECK;
3424 }
3425
3426 void noinline
3427 ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
3428 {
3429 /* TODO: use adjustheap and recalculation */
3430 ev_periodic_stop (EV_A_ w);
3431 ev_periodic_start (EV_A_ w);
3432 }
3433 #endif
3434
3435 #ifndef SA_RESTART
3436 # define SA_RESTART 0
3437 #endif
3438
3439 #if EV_SIGNAL_ENABLE
3440
3441 void noinline
3442 ev_signal_start (EV_P_ ev_signal *w) EV_THROW
3443 {
3444 if (expect_false (ev_is_active (w)))
3445 return;
3446
3447 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3448
3449 #if EV_MULTIPLICITY
3450 assert (("libev: a signal must not be attached to two different loops",
3451 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3452
3453 signals [w->signum - 1].loop = EV_A;
3454 #endif
3455
3456 EV_FREQUENT_CHECK;
3457
3458 #if EV_USE_SIGNALFD
3459 if (sigfd == -2)
3460 {
3461 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3462 if (sigfd < 0 && errno == EINVAL)
3463 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3464
3465 if (sigfd >= 0)
3466 {
3467 fd_intern (sigfd); /* doing it twice will not hurt */
3468
3469 sigemptyset (&sigfd_set);
3470
3471 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3472 ev_set_priority (&sigfd_w, EV_MAXPRI);
3473 ev_io_start (EV_A_ &sigfd_w);
3474 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3475 }
3476 }
3477
3478 if (sigfd >= 0)
3479 {
3480 /* TODO: check .head */
3481 sigaddset (&sigfd_set, w->signum);
3482 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3483
3484 signalfd (sigfd, &sigfd_set, 0);
3485 }
3486 #endif
3487
3488 ev_start (EV_A_ (W)w, 1);
3489 wlist_add (&signals [w->signum - 1].head, (WL)w);
3490
3491 if (!((WL)w)->next)
3492 # if EV_USE_SIGNALFD
3493 if (sigfd < 0) /*TODO*/
3494 # endif
3495 {
3496 # ifdef _WIN32
3497 evpipe_init (EV_A);
3498
3499 signal (w->signum, ev_sighandler);
3500 # else
3501 struct sigaction sa;
3502
3503 evpipe_init (EV_A);
3504
3505 sa.sa_handler = ev_sighandler;
3506 sigfillset (&sa.sa_mask);
3507 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3508 sigaction (w->signum, &sa, 0);
3509
3510 if (origflags & EVFLAG_NOSIGMASK)
3511 {
3512 sigemptyset (&sa.sa_mask);
3513 sigaddset (&sa.sa_mask, w->signum);
3514 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3515 }
3516 #endif
3517 }
3518
3519 EV_FREQUENT_CHECK;
3520 }
3521
3522 void noinline
3523 ev_signal_stop (EV_P_ ev_signal *w) EV_THROW
3524 {
3525 clear_pending (EV_A_ (W)w);
3526 if (expect_false (!ev_is_active (w)))
3527 return;
3528
3529 EV_FREQUENT_CHECK;
3530
3531 wlist_del (&signals [w->signum - 1].head, (WL)w);
3532 ev_stop (EV_A_ (W)w);
3533
3534 if (!signals [w->signum - 1].head)
3535 {
3536 #if EV_MULTIPLICITY
3537 signals [w->signum - 1].loop = 0; /* unattach from signal */
3538 #endif
3539 #if EV_USE_SIGNALFD
3540 if (sigfd >= 0)
3541 {
3542 sigset_t ss;
3543
3544 sigemptyset (&ss);
3545 sigaddset (&ss, w->signum);
3546 sigdelset (&sigfd_set, w->signum);
3547
3548 signalfd (sigfd, &sigfd_set, 0);
3549 sigprocmask (SIG_UNBLOCK, &ss, 0);
3550 }
3551 else
3552 #endif
3553 signal (w->signum, SIG_DFL);
3554 }
3555
3556 EV_FREQUENT_CHECK;
3557 }
3558
3559 #endif
3560
3561 #if EV_CHILD_ENABLE
3562
3563 void
3564 ev_child_start (EV_P_ ev_child *w) EV_THROW
3565 {
3566 #if EV_MULTIPLICITY
3567 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3568 #endif
3569 if (expect_false (ev_is_active (w)))
3570 return;
3571
3572 EV_FREQUENT_CHECK;
3573
3574 ev_start (EV_A_ (W)w, 1);
3575 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3576
3577 EV_FREQUENT_CHECK;
3578 }
3579
3580 void
3581 ev_child_stop (EV_P_ ev_child *w) EV_THROW
3582 {
3583 clear_pending (EV_A_ (W)w);
3584 if (expect_false (!ev_is_active (w)))
3585 return;
3586
3587 EV_FREQUENT_CHECK;
3588
3589 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3590 ev_stop (EV_A_ (W)w);
3591
3592 EV_FREQUENT_CHECK;
3593 }
3594
3595 #endif
3596
3597 #if EV_STAT_ENABLE
3598
3599 # ifdef _WIN32
3600 # undef lstat
3601 # define lstat(a,b) _stati64 (a,b)
3602 # endif
3603
3604 #define DEF_STAT_INTERVAL 5.0074891
3605 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3606 #define MIN_STAT_INTERVAL 0.1074891
3607
3608 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3609
3610 #if EV_USE_INOTIFY
3611
3612 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3613 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3614
3615 static void noinline
3616 infy_add (EV_P_ ev_stat *w)
3617 {
3618 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);
3619
3620 if (w->wd >= 0)
3621 {
3622 struct statfs sfs;
3623
3624 /* now local changes will be tracked by inotify, but remote changes won't */
3625 /* unless the filesystem is known to be local, we therefore still poll */
3626 /* also do poll on <2.6.25, but with normal frequency */
3627
3628 if (!fs_2625)
3629 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3630 else if (!statfs (w->path, &sfs)
3631 && (sfs.f_type == 0x1373 /* devfs */
3632 || sfs.f_type == 0xEF53 /* ext2/3 */
3633 || sfs.f_type == 0x3153464a /* jfs */
3634 || sfs.f_type == 0x52654973 /* reiser3 */
3635 || sfs.f_type == 0x01021994 /* tempfs */
3636 || sfs.f_type == 0x58465342 /* xfs */))
3637 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3638 else
3639 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3640 }
3641 else
3642 {
3643 /* can't use inotify, continue to stat */
3644 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3645
3646 /* if path is not there, monitor some parent directory for speedup hints */
3647 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3648 /* but an efficiency issue only */
3649 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3650 {
3651 char path [4096];
3652 strcpy (path, w->path);
3653
3654 do
3655 {
3656 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3657 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3658
3659 char *pend = strrchr (path, '/');
3660
3661 if (!pend || pend == path)
3662 break;
3663
3664 *pend = 0;
3665 w->wd = inotify_add_watch (fs_fd, path, mask);
3666 }
3667 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3668 }
3669 }
3670
3671 if (w->wd >= 0)
3672 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3673
3674 /* now re-arm timer, if required */
3675 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3676 ev_timer_again (EV_A_ &w->timer);
3677 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3678 }
3679
3680 static void noinline
3681 infy_del (EV_P_ ev_stat *w)
3682 {
3683 int slot;
3684 int wd = w->wd;
3685
3686 if (wd < 0)
3687 return;
3688
3689 w->wd = -2;
3690 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3691 wlist_del (&fs_hash [slot].head, (WL)w);
3692
3693 /* remove this watcher, if others are watching it, they will rearm */
3694 inotify_rm_watch (fs_fd, wd);
3695 }
3696
3697 static void noinline
3698 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3699 {
3700 if (slot < 0)
3701 /* overflow, need to check for all hash slots */
3702 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3703 infy_wd (EV_A_ slot, wd, ev);
3704 else
3705 {
3706 WL w_;
3707
3708 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3709 {
3710 ev_stat *w = (ev_stat *)w_;
3711 w_ = w_->next; /* lets us remove this watcher and all before it */
3712
3713 if (w->wd == wd || wd == -1)
3714 {
3715 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3716 {
3717 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3718 w->wd = -1;
3719 infy_add (EV_A_ w); /* re-add, no matter what */
3720 }
3721
3722 stat_timer_cb (EV_A_ &w->timer, 0);
3723 }
3724 }
3725 }
3726 }
3727
3728 static void
3729 infy_cb (EV_P_ ev_io *w, int revents)
3730 {
3731 char buf [EV_INOTIFY_BUFSIZE];
3732 int ofs;
3733 int len = read (fs_fd, buf, sizeof (buf));
3734
3735 for (ofs = 0; ofs < len; )
3736 {
3737 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3738 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3739 ofs += sizeof (struct inotify_event) + ev->len;
3740 }
3741 }
3742
3743 inline_size void ecb_cold
3744 ev_check_2625 (EV_P)
3745 {
3746 /* kernels < 2.6.25 are borked
3747 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3748 */
3749 if (ev_linux_version () < 0x020619)
3750 return;
3751
3752 fs_2625 = 1;
3753 }
3754
3755 inline_size int
3756 infy_newfd (void)
3757 {
3758 #if defined IN_CLOEXEC && defined IN_NONBLOCK
3759 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3760 if (fd >= 0)
3761 return fd;
3762 #endif
3763 return inotify_init ();
3764 }
3765
3766 inline_size void
3767 infy_init (EV_P)
3768 {
3769 if (fs_fd != -2)
3770 return;
3771
3772 fs_fd = -1;
3773
3774 ev_check_2625 (EV_A);
3775
3776 fs_fd = infy_newfd ();
3777
3778 if (fs_fd >= 0)
3779 {
3780 fd_intern (fs_fd);
3781 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3782 ev_set_priority (&fs_w, EV_MAXPRI);
3783 ev_io_start (EV_A_ &fs_w);
3784 ev_unref (EV_A);
3785 }
3786 }
3787
3788 inline_size void
3789 infy_fork (EV_P)
3790 {
3791 int slot;
3792
3793 if (fs_fd < 0)
3794 return;
3795
3796 ev_ref (EV_A);
3797 ev_io_stop (EV_A_ &fs_w);
3798 close (fs_fd);
3799 fs_fd = infy_newfd ();
3800
3801 if (fs_fd >= 0)
3802 {
3803 fd_intern (fs_fd);
3804 ev_io_set (&fs_w, fs_fd, EV_READ);
3805 ev_io_start (EV_A_ &fs_w);
3806 ev_unref (EV_A);
3807 }
3808
3809 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3810 {
3811 WL w_ = fs_hash [slot].head;
3812 fs_hash [slot].head = 0;
3813
3814 while (w_)
3815 {
3816 ev_stat *w = (ev_stat *)w_;
3817 w_ = w_->next; /* lets us add this watcher */
3818
3819 w->wd = -1;
3820
3821 if (fs_fd >= 0)
3822 infy_add (EV_A_ w); /* re-add, no matter what */
3823 else
3824 {
3825 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3826 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3827 ev_timer_again (EV_A_ &w->timer);
3828 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3829 }
3830 }
3831 }
3832 }
3833
3834 #endif
3835
3836 #ifdef _WIN32
3837 # define EV_LSTAT(p,b) _stati64 (p, b)
3838 #else
3839 # define EV_LSTAT(p,b) lstat (p, b)
3840 #endif
3841
3842 void
3843 ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
3844 {
3845 if (lstat (w->path, &w->attr) < 0)
3846 w->attr.st_nlink = 0;
3847 else if (!w->attr.st_nlink)
3848 w->attr.st_nlink = 1;
3849 }
3850
3851 static void noinline
3852 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3853 {
3854 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3855
3856 ev_statdata prev = w->attr;
3857 ev_stat_stat (EV_A_ w);
3858
3859 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3860 if (
3861 prev.st_dev != w->attr.st_dev
3862 || prev.st_ino != w->attr.st_ino
3863 || prev.st_mode != w->attr.st_mode
3864 || prev.st_nlink != w->attr.st_nlink
3865 || prev.st_uid != w->attr.st_uid
3866 || prev.st_gid != w->attr.st_gid
3867 || prev.st_rdev != w->attr.st_rdev
3868 || prev.st_size != w->attr.st_size
3869 || prev.st_atime != w->attr.st_atime
3870 || prev.st_mtime != w->attr.st_mtime
3871 || prev.st_ctime != w->attr.st_ctime
3872 ) {
3873 /* we only update w->prev on actual differences */
3874 /* in case we test more often than invoke the callback, */
3875 /* to ensure that prev is always different to attr */
3876 w->prev = prev;
3877
3878 #if EV_USE_INOTIFY
3879 if (fs_fd >= 0)
3880 {
3881 infy_del (EV_A_ w);
3882 infy_add (EV_A_ w);
3883 ev_stat_stat (EV_A_ w); /* avoid race... */
3884 }
3885 #endif
3886
3887 ev_feed_event (EV_A_ w, EV_STAT);
3888 }
3889 }
3890
3891 void
3892 ev_stat_start (EV_P_ ev_stat *w) EV_THROW
3893 {
3894 if (expect_false (ev_is_active (w)))
3895 return;
3896
3897 ev_stat_stat (EV_A_ w);
3898
3899 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3900 w->interval = MIN_STAT_INTERVAL;
3901
3902 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3903 ev_set_priority (&w->timer, ev_priority (w));
3904
3905 #if EV_USE_INOTIFY
3906 infy_init (EV_A);
3907
3908 if (fs_fd >= 0)
3909 infy_add (EV_A_ w);
3910 else
3911 #endif
3912 {
3913 ev_timer_again (EV_A_ &w->timer);
3914 ev_unref (EV_A);
3915 }
3916
3917 ev_start (EV_A_ (W)w, 1);
3918
3919 EV_FREQUENT_CHECK;
3920 }
3921
3922 void
3923 ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
3924 {
3925 clear_pending (EV_A_ (W)w);
3926 if (expect_false (!ev_is_active (w)))
3927 return;
3928
3929 EV_FREQUENT_CHECK;
3930
3931 #if EV_USE_INOTIFY
3932 infy_del (EV_A_ w);
3933 #endif
3934
3935 if (ev_is_active (&w->timer))
3936 {
3937 ev_ref (EV_A);
3938 ev_timer_stop (EV_A_ &w->timer);
3939 }
3940
3941 ev_stop (EV_A_ (W)w);
3942
3943 EV_FREQUENT_CHECK;
3944 }
3945 #endif
3946
3947 #if EV_IDLE_ENABLE
3948 void
3949 ev_idle_start (EV_P_ ev_idle *w) EV_THROW
3950 {
3951 if (expect_false (ev_is_active (w)))
3952 return;
3953
3954 pri_adjust (EV_A_ (W)w);
3955
3956 EV_FREQUENT_CHECK;
3957
3958 {
3959 int active = ++idlecnt [ABSPRI (w)];
3960
3961 ++idleall;
3962 ev_start (EV_A_ (W)w, active);
3963
3964 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3965 idles [ABSPRI (w)][active - 1] = w;
3966 }
3967
3968 EV_FREQUENT_CHECK;
3969 }
3970
3971 void
3972 ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
3973 {
3974 clear_pending (EV_A_ (W)w);
3975 if (expect_false (!ev_is_active (w)))
3976 return;
3977
3978 EV_FREQUENT_CHECK;
3979
3980 {
3981 int active = ev_active (w);
3982
3983 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3984 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3985
3986 ev_stop (EV_A_ (W)w);
3987 --idleall;
3988 }
3989
3990 EV_FREQUENT_CHECK;
3991 }
3992 #endif
3993
3994 #if EV_PREPARE_ENABLE
3995 void
3996 ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
3997 {
3998 if (expect_false (ev_is_active (w)))
3999 return;
4000
4001 EV_FREQUENT_CHECK;
4002
4003 ev_start (EV_A_ (W)w, ++preparecnt);
4004 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
4005 prepares [preparecnt - 1] = w;
4006
4007 EV_FREQUENT_CHECK;
4008 }
4009
4010 void
4011 ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
4012 {
4013 clear_pending (EV_A_ (W)w);
4014 if (expect_false (!ev_is_active (w)))
4015 return;
4016
4017 EV_FREQUENT_CHECK;
4018
4019 {
4020 int active = ev_active (w);
4021
4022 prepares [active - 1] = prepares [--preparecnt];
4023 ev_active (prepares [active - 1]) = active;
4024 }
4025
4026 ev_stop (EV_A_ (W)w);
4027
4028 EV_FREQUENT_CHECK;
4029 }
4030 #endif
4031
4032 #if EV_CHECK_ENABLE
4033 void
4034 ev_check_start (EV_P_ ev_check *w) EV_THROW
4035 {
4036 if (expect_false (ev_is_active (w)))
4037 return;
4038
4039 EV_FREQUENT_CHECK;
4040
4041 ev_start (EV_A_ (W)w, ++checkcnt);
4042 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4043 checks [checkcnt - 1] = w;
4044
4045 EV_FREQUENT_CHECK;
4046 }
4047
4048 void
4049 ev_check_stop (EV_P_ ev_check *w) EV_THROW
4050 {
4051 clear_pending (EV_A_ (W)w);
4052 if (expect_false (!ev_is_active (w)))
4053 return;
4054
4055 EV_FREQUENT_CHECK;
4056
4057 {
4058 int active = ev_active (w);
4059
4060 checks [active - 1] = checks [--checkcnt];
4061 ev_active (checks [active - 1]) = active;
4062 }
4063
4064 ev_stop (EV_A_ (W)w);
4065
4066 EV_FREQUENT_CHECK;
4067 }
4068 #endif
4069
4070 #if EV_EMBED_ENABLE
4071 void noinline
4072 ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
4073 {
4074 ev_run (w->other, EVRUN_NOWAIT);
4075 }
4076
4077 static void
4078 embed_io_cb (EV_P_ ev_io *io, int revents)
4079 {
4080 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4081
4082 if (ev_cb (w))
4083 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4084 else
4085 ev_run (w->other, EVRUN_NOWAIT);
4086 }
4087
4088 static void
4089 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4090 {
4091 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4092
4093 {
4094 EV_P = w->other;
4095
4096 while (fdchangecnt)
4097 {
4098 fd_reify (EV_A);
4099 ev_run (EV_A_ EVRUN_NOWAIT);
4100 }
4101 }
4102 }
4103
4104 static void
4105 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4106 {
4107 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4108
4109 ev_embed_stop (EV_A_ w);
4110
4111 {
4112 EV_P = w->other;
4113
4114 ev_loop_fork (EV_A);
4115 ev_run (EV_A_ EVRUN_NOWAIT);
4116 }
4117
4118 ev_embed_start (EV_A_ w);
4119 }
4120
4121 #if 0
4122 static void
4123 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4124 {
4125 ev_idle_stop (EV_A_ idle);
4126 }
4127 #endif
4128
4129 void
4130 ev_embed_start (EV_P_ ev_embed *w) EV_THROW
4131 {
4132 if (expect_false (ev_is_active (w)))
4133 return;
4134
4135 {
4136 EV_P = w->other;
4137 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4138 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4139 }
4140
4141 EV_FREQUENT_CHECK;
4142
4143 ev_set_priority (&w->io, ev_priority (w));
4144 ev_io_start (EV_A_ &w->io);
4145
4146 ev_prepare_init (&w->prepare, embed_prepare_cb);
4147 ev_set_priority (&w->prepare, EV_MINPRI);
4148 ev_prepare_start (EV_A_ &w->prepare);
4149
4150 ev_fork_init (&w->fork, embed_fork_cb);
4151 ev_fork_start (EV_A_ &w->fork);
4152
4153 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4154
4155 ev_start (EV_A_ (W)w, 1);
4156
4157 EV_FREQUENT_CHECK;
4158 }
4159
4160 void
4161 ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
4162 {
4163 clear_pending (EV_A_ (W)w);
4164 if (expect_false (!ev_is_active (w)))
4165 return;
4166
4167 EV_FREQUENT_CHECK;
4168
4169 ev_io_stop (EV_A_ &w->io);
4170 ev_prepare_stop (EV_A_ &w->prepare);
4171 ev_fork_stop (EV_A_ &w->fork);
4172
4173 ev_stop (EV_A_ (W)w);
4174
4175 EV_FREQUENT_CHECK;
4176 }
4177 #endif
4178
4179 #if EV_FORK_ENABLE
4180 void
4181 ev_fork_start (EV_P_ ev_fork *w) EV_THROW
4182 {
4183 if (expect_false (ev_is_active (w)))
4184 return;
4185
4186 EV_FREQUENT_CHECK;
4187
4188 ev_start (EV_A_ (W)w, ++forkcnt);
4189 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4190 forks [forkcnt - 1] = w;
4191
4192 EV_FREQUENT_CHECK;
4193 }
4194
4195 void
4196 ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
4197 {
4198 clear_pending (EV_A_ (W)w);
4199 if (expect_false (!ev_is_active (w)))
4200 return;
4201
4202 EV_FREQUENT_CHECK;
4203
4204 {
4205 int active = ev_active (w);
4206
4207 forks [active - 1] = forks [--forkcnt];
4208 ev_active (forks [active - 1]) = active;
4209 }
4210
4211 ev_stop (EV_A_ (W)w);
4212
4213 EV_FREQUENT_CHECK;
4214 }
4215 #endif
4216
4217 #if EV_CLEANUP_ENABLE
4218 void
4219 ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
4220 {
4221 if (expect_false (ev_is_active (w)))
4222 return;
4223
4224 EV_FREQUENT_CHECK;
4225
4226 ev_start (EV_A_ (W)w, ++cleanupcnt);
4227 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4228 cleanups [cleanupcnt - 1] = w;
4229
4230 /* cleanup watchers should never keep a refcount on the loop */
4231 ev_unref (EV_A);
4232 EV_FREQUENT_CHECK;
4233 }
4234
4235 void
4236 ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
4237 {
4238 clear_pending (EV_A_ (W)w);
4239 if (expect_false (!ev_is_active (w)))
4240 return;
4241
4242 EV_FREQUENT_CHECK;
4243 ev_ref (EV_A);
4244
4245 {
4246 int active = ev_active (w);
4247
4248 cleanups [active - 1] = cleanups [--cleanupcnt];
4249 ev_active (cleanups [active - 1]) = active;
4250 }
4251
4252 ev_stop (EV_A_ (W)w);
4253
4254 EV_FREQUENT_CHECK;
4255 }
4256 #endif
4257
4258 #if EV_ASYNC_ENABLE
4259 void
4260 ev_async_start (EV_P_ ev_async *w) EV_THROW
4261 {
4262 if (expect_false (ev_is_active (w)))
4263 return;
4264
4265 w->sent = 0;
4266
4267 evpipe_init (EV_A);
4268
4269 EV_FREQUENT_CHECK;
4270
4271 ev_start (EV_A_ (W)w, ++asynccnt);
4272 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4273 asyncs [asynccnt - 1] = w;
4274
4275 EV_FREQUENT_CHECK;
4276 }
4277
4278 void
4279 ev_async_stop (EV_P_ ev_async *w) EV_THROW
4280 {
4281 clear_pending (EV_A_ (W)w);
4282 if (expect_false (!ev_is_active (w)))
4283 return;
4284
4285 EV_FREQUENT_CHECK;
4286
4287 {
4288 int active = ev_active (w);
4289
4290 asyncs [active - 1] = asyncs [--asynccnt];
4291 ev_active (asyncs [active - 1]) = active;
4292 }
4293
4294 ev_stop (EV_A_ (W)w);
4295
4296 EV_FREQUENT_CHECK;
4297 }
4298
4299 void
4300 ev_async_send (EV_P_ ev_async *w) EV_THROW
4301 {
4302 w->sent = 1;
4303 evpipe_write (EV_A_ &async_pending);
4304 }
4305 #endif
4306
4307 /*****************************************************************************/
4308
4309 struct ev_once
4310 {
4311 ev_io io;
4312 ev_timer to;
4313 void (*cb)(int revents, void *arg);
4314 void *arg;
4315 };
4316
4317 static void
4318 once_cb (EV_P_ struct ev_once *once, int revents)
4319 {
4320 void (*cb)(int revents, void *arg) = once->cb;
4321 void *arg = once->arg;
4322
4323 ev_io_stop (EV_A_ &once->io);
4324 ev_timer_stop (EV_A_ &once->to);
4325 ev_free (once);
4326
4327 cb (revents, arg);
4328 }
4329
4330 static void
4331 once_cb_io (EV_P_ ev_io *w, int revents)
4332 {
4333 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4334
4335 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4336 }
4337
4338 static void
4339 once_cb_to (EV_P_ ev_timer *w, int revents)
4340 {
4341 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4342
4343 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4344 }
4345
4346 void
4347 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
4348 {
4349 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4350
4351 if (expect_false (!once))
4352 {
4353 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4354 return;
4355 }
4356
4357 once->cb = cb;
4358 once->arg = arg;
4359
4360 ev_init (&once->io, once_cb_io);
4361 if (fd >= 0)
4362 {
4363 ev_io_set (&once->io, fd, events);
4364 ev_io_start (EV_A_ &once->io);
4365 }
4366
4367 ev_init (&once->to, once_cb_to);
4368 if (timeout >= 0.)
4369 {
4370 ev_timer_set (&once->to, timeout, 0.);
4371 ev_timer_start (EV_A_ &once->to);
4372 }
4373 }
4374
4375 /*****************************************************************************/
4376
4377 #if EV_WALK_ENABLE
4378 void ecb_cold
4379 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
4380 {
4381 int i, j;
4382 ev_watcher_list *wl, *wn;
4383
4384 if (types & (EV_IO | EV_EMBED))
4385 for (i = 0; i < anfdmax; ++i)
4386 for (wl = anfds [i].head; wl; )
4387 {
4388 wn = wl->next;
4389
4390 #if EV_EMBED_ENABLE
4391 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4392 {
4393 if (types & EV_EMBED)
4394 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4395 }
4396 else
4397 #endif
4398 #if EV_USE_INOTIFY
4399 if (ev_cb ((ev_io *)wl) == infy_cb)
4400 ;
4401 else
4402 #endif
4403 if ((ev_io *)wl != &pipe_w)
4404 if (types & EV_IO)
4405 cb (EV_A_ EV_IO, wl);
4406
4407 wl = wn;
4408 }
4409
4410 if (types & (EV_TIMER | EV_STAT))
4411 for (i = timercnt + HEAP0; i-- > HEAP0; )
4412 #if EV_STAT_ENABLE
4413 /*TODO: timer is not always active*/
4414 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
4415 {
4416 if (types & EV_STAT)
4417 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
4418 }
4419 else
4420 #endif
4421 if (types & EV_TIMER)
4422 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
4423
4424 #if EV_PERIODIC_ENABLE
4425 if (types & EV_PERIODIC)
4426 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4427 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4428 #endif
4429
4430 #if EV_IDLE_ENABLE
4431 if (types & EV_IDLE)
4432 for (j = NUMPRI; j--; )
4433 for (i = idlecnt [j]; i--; )
4434 cb (EV_A_ EV_IDLE, idles [j][i]);
4435 #endif
4436
4437 #if EV_FORK_ENABLE
4438 if (types & EV_FORK)
4439 for (i = forkcnt; i--; )
4440 if (ev_cb (forks [i]) != embed_fork_cb)
4441 cb (EV_A_ EV_FORK, forks [i]);
4442 #endif
4443
4444 #if EV_ASYNC_ENABLE
4445 if (types & EV_ASYNC)
4446 for (i = asynccnt; i--; )
4447 cb (EV_A_ EV_ASYNC, asyncs [i]);
4448 #endif
4449
4450 #if EV_PREPARE_ENABLE
4451 if (types & EV_PREPARE)
4452 for (i = preparecnt; i--; )
4453 # if EV_EMBED_ENABLE
4454 if (ev_cb (prepares [i]) != embed_prepare_cb)
4455 # endif
4456 cb (EV_A_ EV_PREPARE, prepares [i]);
4457 #endif
4458
4459 #if EV_CHECK_ENABLE
4460 if (types & EV_CHECK)
4461 for (i = checkcnt; i--; )
4462 cb (EV_A_ EV_CHECK, checks [i]);
4463 #endif
4464
4465 #if EV_SIGNAL_ENABLE
4466 if (types & EV_SIGNAL)
4467 for (i = 0; i < EV_NSIG - 1; ++i)
4468 for (wl = signals [i].head; wl; )
4469 {
4470 wn = wl->next;
4471 cb (EV_A_ EV_SIGNAL, wl);
4472 wl = wn;
4473 }
4474 #endif
4475
4476 #if EV_CHILD_ENABLE
4477 if (types & EV_CHILD)
4478 for (i = (EV_PID_HASHSIZE); i--; )
4479 for (wl = childs [i]; wl; )
4480 {
4481 wn = wl->next;
4482 cb (EV_A_ EV_CHILD, wl);
4483 wl = wn;
4484 }
4485 #endif
4486 /* EV_STAT 0x00001000 /* stat data changed */
4487 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4488 }
4489 #endif
4490
4491 #if EV_MULTIPLICITY
4492 #include "ev_wrap.h"
4493 #endif
4494