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/cvs/libev/ev.c
Revision: 1.390
Committed: Thu Aug 4 11:58:02 2011 UTC (12 years, 11 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.389: +1 -1 lines
Log Message:
bugfix by Ben Noordhuis

File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 /* this big block deduces configuration from config.h */
41 #ifndef EV_STANDALONE
42 # ifdef EV_CONFIG_H
43 # include EV_CONFIG_H
44 # else
45 # include "config.h"
46 # endif
47
48 #if HAVE_FLOOR
49 # ifndef EV_USE_FLOOR
50 # define EV_USE_FLOOR 1
51 # endif
52 #endif
53
54 # if HAVE_CLOCK_SYSCALL
55 # ifndef EV_USE_CLOCK_SYSCALL
56 # define EV_USE_CLOCK_SYSCALL 1
57 # ifndef EV_USE_REALTIME
58 # define EV_USE_REALTIME 0
59 # endif
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 1
62 # endif
63 # endif
64 # elif !defined(EV_USE_CLOCK_SYSCALL)
65 # define EV_USE_CLOCK_SYSCALL 0
66 # endif
67
68 # if HAVE_CLOCK_GETTIME
69 # ifndef EV_USE_MONOTONIC
70 # define EV_USE_MONOTONIC 1
71 # endif
72 # ifndef EV_USE_REALTIME
73 # define EV_USE_REALTIME 0
74 # endif
75 # else
76 # ifndef EV_USE_MONOTONIC
77 # define EV_USE_MONOTONIC 0
78 # endif
79 # ifndef EV_USE_REALTIME
80 # define EV_USE_REALTIME 0
81 # endif
82 # endif
83
84 # if HAVE_NANOSLEEP
85 # ifndef EV_USE_NANOSLEEP
86 # define EV_USE_NANOSLEEP EV_FEATURE_OS
87 # endif
88 # else
89 # undef EV_USE_NANOSLEEP
90 # define EV_USE_NANOSLEEP 0
91 # endif
92
93 # if HAVE_SELECT && HAVE_SYS_SELECT_H
94 # ifndef EV_USE_SELECT
95 # define EV_USE_SELECT EV_FEATURE_BACKENDS
96 # endif
97 # else
98 # undef EV_USE_SELECT
99 # define EV_USE_SELECT 0
100 # endif
101
102 # if HAVE_POLL && HAVE_POLL_H
103 # ifndef EV_USE_POLL
104 # define EV_USE_POLL EV_FEATURE_BACKENDS
105 # endif
106 # else
107 # undef EV_USE_POLL
108 # define EV_USE_POLL 0
109 # endif
110
111 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
112 # ifndef EV_USE_EPOLL
113 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
114 # endif
115 # else
116 # undef EV_USE_EPOLL
117 # define EV_USE_EPOLL 0
118 # endif
119
120 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
121 # ifndef EV_USE_KQUEUE
122 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
123 # endif
124 # else
125 # undef EV_USE_KQUEUE
126 # define EV_USE_KQUEUE 0
127 # endif
128
129 # if HAVE_PORT_H && HAVE_PORT_CREATE
130 # ifndef EV_USE_PORT
131 # define EV_USE_PORT EV_FEATURE_BACKENDS
132 # endif
133 # else
134 # undef EV_USE_PORT
135 # define EV_USE_PORT 0
136 # endif
137
138 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
139 # ifndef EV_USE_INOTIFY
140 # define EV_USE_INOTIFY EV_FEATURE_OS
141 # endif
142 # else
143 # undef EV_USE_INOTIFY
144 # define EV_USE_INOTIFY 0
145 # endif
146
147 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
148 # ifndef EV_USE_SIGNALFD
149 # define EV_USE_SIGNALFD EV_FEATURE_OS
150 # endif
151 # else
152 # undef EV_USE_SIGNALFD
153 # define EV_USE_SIGNALFD 0
154 # endif
155
156 # if HAVE_EVENTFD
157 # ifndef EV_USE_EVENTFD
158 # define EV_USE_EVENTFD EV_FEATURE_OS
159 # endif
160 # else
161 # undef EV_USE_EVENTFD
162 # define EV_USE_EVENTFD 0
163 # endif
164
165 #endif
166
167 #include <stdlib.h>
168 #include <string.h>
169 #include <fcntl.h>
170 #include <stddef.h>
171
172 #include <stdio.h>
173
174 #include <assert.h>
175 #include <errno.h>
176 #include <sys/types.h>
177 #include <time.h>
178 #include <limits.h>
179
180 #include <signal.h>
181
182 #ifdef EV_H
183 # include EV_H
184 #else
185 # include "ev.h"
186 #endif
187
188 EV_CPP(extern "C" {)
189
190 #ifndef _WIN32
191 # include <sys/time.h>
192 # include <sys/wait.h>
193 # include <unistd.h>
194 #else
195 # include <io.h>
196 # define WIN32_LEAN_AND_MEAN
197 # include <windows.h>
198 # ifndef EV_SELECT_IS_WINSOCKET
199 # define EV_SELECT_IS_WINSOCKET 1
200 # endif
201 # undef EV_AVOID_STDIO
202 #endif
203
204 /* OS X, in its infinite idiocy, actually HARDCODES
205 * a limit of 1024 into their select. Where people have brains,
206 * OS X engineers apparently have a vacuum. Or maybe they were
207 * ordered to have a vacuum, or they do anything for money.
208 * This might help. Or not.
209 */
210 #define _DARWIN_UNLIMITED_SELECT 1
211
212 /* this block tries to deduce configuration from header-defined symbols and defaults */
213
214 /* try to deduce the maximum number of signals on this platform */
215 #if defined (EV_NSIG)
216 /* use what's provided */
217 #elif defined (NSIG)
218 # define EV_NSIG (NSIG)
219 #elif defined(_NSIG)
220 # define EV_NSIG (_NSIG)
221 #elif defined (SIGMAX)
222 # define EV_NSIG (SIGMAX+1)
223 #elif defined (SIG_MAX)
224 # define EV_NSIG (SIG_MAX+1)
225 #elif defined (_SIG_MAX)
226 # define EV_NSIG (_SIG_MAX+1)
227 #elif defined (MAXSIG)
228 # define EV_NSIG (MAXSIG+1)
229 #elif defined (MAX_SIG)
230 # define EV_NSIG (MAX_SIG+1)
231 #elif defined (SIGARRAYSIZE)
232 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
233 #elif defined (_sys_nsig)
234 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
235 #else
236 # error "unable to find value for NSIG, please report"
237 /* to make it compile regardless, just remove the above line, */
238 /* but consider reporting it, too! :) */
239 # define EV_NSIG 65
240 #endif
241
242 #ifndef EV_USE_FLOOR
243 # define EV_USE_FLOOR 0
244 #endif
245
246 #ifndef EV_USE_CLOCK_SYSCALL
247 # if __linux && __GLIBC__ >= 2
248 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
249 # else
250 # define EV_USE_CLOCK_SYSCALL 0
251 # endif
252 #endif
253
254 #ifndef EV_USE_MONOTONIC
255 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
256 # define EV_USE_MONOTONIC EV_FEATURE_OS
257 # else
258 # define EV_USE_MONOTONIC 0
259 # endif
260 #endif
261
262 #ifndef EV_USE_REALTIME
263 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
264 #endif
265
266 #ifndef EV_USE_NANOSLEEP
267 # if _POSIX_C_SOURCE >= 199309L
268 # define EV_USE_NANOSLEEP EV_FEATURE_OS
269 # else
270 # define EV_USE_NANOSLEEP 0
271 # endif
272 #endif
273
274 #ifndef EV_USE_SELECT
275 # define EV_USE_SELECT EV_FEATURE_BACKENDS
276 #endif
277
278 #ifndef EV_USE_POLL
279 # ifdef _WIN32
280 # define EV_USE_POLL 0
281 # else
282 # define EV_USE_POLL EV_FEATURE_BACKENDS
283 # endif
284 #endif
285
286 #ifndef EV_USE_EPOLL
287 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
288 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
289 # else
290 # define EV_USE_EPOLL 0
291 # endif
292 #endif
293
294 #ifndef EV_USE_KQUEUE
295 # define EV_USE_KQUEUE 0
296 #endif
297
298 #ifndef EV_USE_PORT
299 # define EV_USE_PORT 0
300 #endif
301
302 #ifndef EV_USE_INOTIFY
303 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
304 # define EV_USE_INOTIFY EV_FEATURE_OS
305 # else
306 # define EV_USE_INOTIFY 0
307 # endif
308 #endif
309
310 #ifndef EV_PID_HASHSIZE
311 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
312 #endif
313
314 #ifndef EV_INOTIFY_HASHSIZE
315 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
316 #endif
317
318 #ifndef EV_USE_EVENTFD
319 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
320 # define EV_USE_EVENTFD EV_FEATURE_OS
321 # else
322 # define EV_USE_EVENTFD 0
323 # endif
324 #endif
325
326 #ifndef EV_USE_SIGNALFD
327 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
328 # define EV_USE_SIGNALFD EV_FEATURE_OS
329 # else
330 # define EV_USE_SIGNALFD 0
331 # endif
332 #endif
333
334 #if 0 /* debugging */
335 # define EV_VERIFY 3
336 # define EV_USE_4HEAP 1
337 # define EV_HEAP_CACHE_AT 1
338 #endif
339
340 #ifndef EV_VERIFY
341 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
342 #endif
343
344 #ifndef EV_USE_4HEAP
345 # define EV_USE_4HEAP EV_FEATURE_DATA
346 #endif
347
348 #ifndef EV_HEAP_CACHE_AT
349 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
350 #endif
351
352 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
353 /* which makes programs even slower. might work on other unices, too. */
354 #if EV_USE_CLOCK_SYSCALL
355 # include <syscall.h>
356 # ifdef SYS_clock_gettime
357 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
358 # undef EV_USE_MONOTONIC
359 # define EV_USE_MONOTONIC 1
360 # else
361 # undef EV_USE_CLOCK_SYSCALL
362 # define EV_USE_CLOCK_SYSCALL 0
363 # endif
364 #endif
365
366 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
367
368 #ifdef _AIX
369 /* AIX has a completely broken poll.h header */
370 # undef EV_USE_POLL
371 # define EV_USE_POLL 0
372 #endif
373
374 #ifndef CLOCK_MONOTONIC
375 # undef EV_USE_MONOTONIC
376 # define EV_USE_MONOTONIC 0
377 #endif
378
379 #ifndef CLOCK_REALTIME
380 # undef EV_USE_REALTIME
381 # define EV_USE_REALTIME 0
382 #endif
383
384 #if !EV_STAT_ENABLE
385 # undef EV_USE_INOTIFY
386 # define EV_USE_INOTIFY 0
387 #endif
388
389 #if !EV_USE_NANOSLEEP
390 /* hp-ux has it in sys/time.h, which we unconditionally include above */
391 # if !defined(_WIN32) && !defined(__hpux)
392 # include <sys/select.h>
393 # endif
394 #endif
395
396 #if EV_USE_INOTIFY
397 # include <sys/statfs.h>
398 # include <sys/inotify.h>
399 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
400 # ifndef IN_DONT_FOLLOW
401 # undef EV_USE_INOTIFY
402 # define EV_USE_INOTIFY 0
403 # endif
404 #endif
405
406 #if EV_SELECT_IS_WINSOCKET
407 # include <winsock.h>
408 #endif
409
410 #if EV_USE_EVENTFD
411 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
412 # include <stdint.h>
413 # ifndef EFD_NONBLOCK
414 # define EFD_NONBLOCK O_NONBLOCK
415 # endif
416 # ifndef EFD_CLOEXEC
417 # ifdef O_CLOEXEC
418 # define EFD_CLOEXEC O_CLOEXEC
419 # else
420 # define EFD_CLOEXEC 02000000
421 # endif
422 # endif
423 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
424 #endif
425
426 #if EV_USE_SIGNALFD
427 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
428 # include <stdint.h>
429 # ifndef SFD_NONBLOCK
430 # define SFD_NONBLOCK O_NONBLOCK
431 # endif
432 # ifndef SFD_CLOEXEC
433 # ifdef O_CLOEXEC
434 # define SFD_CLOEXEC O_CLOEXEC
435 # else
436 # define SFD_CLOEXEC 02000000
437 # endif
438 # endif
439 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
440
441 struct signalfd_siginfo
442 {
443 uint32_t ssi_signo;
444 char pad[128 - sizeof (uint32_t)];
445 };
446 #endif
447
448 /**/
449
450 #if EV_VERIFY >= 3
451 # define EV_FREQUENT_CHECK ev_verify (EV_A)
452 #else
453 # define EV_FREQUENT_CHECK do { } while (0)
454 #endif
455
456 /*
457 * This is used to work around floating point rounding problems.
458 * This value is good at least till the year 4000.
459 */
460 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
461 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
462
463 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
464 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
465
466 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
467 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
468
469 /* the following are taken from libecb */
470 /* ecb.h start */
471
472 /* many compilers define _GNUC_ to some versions but then only implement
473 * what their idiot authors think are the "more important" extensions,
474 * causing enourmous grief in return for some better fake benchmark numbers.
475 * or so.
476 * we try to detect these and simply assume they are not gcc - if they have
477 * an issue with that they should have done it right in the first place.
478 */
479 #ifndef ECB_GCC_VERSION
480 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
481 #define ECB_GCC_VERSION(major,minor) 0
482 #else
483 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
484 #endif
485 #endif
486
487 #if __cplusplus
488 #define ecb_inline static inline
489 #elif ECB_GCC_VERSION(2,5)
490 #define ecb_inline static __inline__
491 #elif ECB_C99
492 #define ecb_inline static inline
493 #else
494 #define ecb_inline static
495 #endif
496
497 #ifndef ECB_MEMORY_FENCE
498 #if ECB_GCC_VERSION(2,5)
499 #if __x86
500 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
501 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
502 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE /* better be safe than sorry */
503 #elif __amd64
504 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
505 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
506 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence")
507 #endif
508 #endif
509 #endif
510
511 #ifndef ECB_MEMORY_FENCE
512 #if ECB_GCC_VERSION(4,4)
513 #define ECB_MEMORY_FENCE __sync_synchronize ()
514 #define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); })
515 #define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); })
516 #elif _MSC_VER >= 1400 /* VC++ 2005 */
517 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
518 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
519 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
520 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
521 #elif defined(_WIN32)
522 #include <WinNT.h>
523 #define ECB_MEMORY_FENCE MemoryBarrier ()
524 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
525 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
526 #endif
527 #endif
528
529 #ifndef ECB_MEMORY_FENCE
530 #include <pthread.h>
531
532 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
533 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
534 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
535 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
536 #endif
537
538 #if ECB_GCC_VERSION(3,1)
539 #define ecb_attribute(attrlist) __attribute__(attrlist)
540 #define ecb_is_constant(expr) __builtin_constant_p (expr)
541 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
542 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
543 #else
544 #define ecb_attribute(attrlist)
545 #define ecb_is_constant(expr) 0
546 #define ecb_expect(expr,value) (expr)
547 #define ecb_prefetch(addr,rw,locality)
548 #endif
549
550 #define ecb_noinline ecb_attribute ((__noinline__))
551 #define ecb_noreturn ecb_attribute ((__noreturn__))
552 #define ecb_unused ecb_attribute ((__unused__))
553 #define ecb_const ecb_attribute ((__const__))
554 #define ecb_pure ecb_attribute ((__pure__))
555
556 #if ECB_GCC_VERSION(4,3)
557 #define ecb_artificial ecb_attribute ((__artificial__))
558 #define ecb_hot ecb_attribute ((__hot__))
559 #define ecb_cold ecb_attribute ((__cold__))
560 #else
561 #define ecb_artificial
562 #define ecb_hot
563 #define ecb_cold
564 #endif
565
566 /* put around conditional expressions if you are very sure that the */
567 /* expression is mostly true or mostly false. note that these return */
568 /* booleans, not the expression. */
569 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
570 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
571 /* ecb.h end */
572
573 #define expect_false(cond) ecb_expect_false (cond)
574 #define expect_true(cond) ecb_expect_true (cond)
575 #define noinline ecb_noinline
576
577 #define inline_size ecb_inline
578
579 #if EV_FEATURE_CODE
580 # define inline_speed ecb_inline
581 #else
582 # define inline_speed static noinline
583 #endif
584
585 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
586
587 #if EV_MINPRI == EV_MAXPRI
588 # define ABSPRI(w) (((W)w), 0)
589 #else
590 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
591 #endif
592
593 #define EMPTY /* required for microsofts broken pseudo-c compiler */
594 #define EMPTY2(a,b) /* used to suppress some warnings */
595
596 typedef ev_watcher *W;
597 typedef ev_watcher_list *WL;
598 typedef ev_watcher_time *WT;
599
600 #define ev_active(w) ((W)(w))->active
601 #define ev_at(w) ((WT)(w))->at
602
603 #if EV_USE_REALTIME
604 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
605 /* giving it a reasonably high chance of working on typical architectures */
606 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
607 #endif
608
609 #if EV_USE_MONOTONIC
610 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
611 #endif
612
613 #ifndef EV_FD_TO_WIN32_HANDLE
614 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
615 #endif
616 #ifndef EV_WIN32_HANDLE_TO_FD
617 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
618 #endif
619 #ifndef EV_WIN32_CLOSE_FD
620 # define EV_WIN32_CLOSE_FD(fd) close (fd)
621 #endif
622
623 #ifdef _WIN32
624 # include "ev_win32.c"
625 #endif
626
627 /*****************************************************************************/
628
629 /* define a suitable floor function (only used by periodics atm) */
630
631 #if EV_USE_FLOOR
632 # include <math.h>
633 # define ev_floor(v) floor (v)
634 #else
635
636 #include <float.h>
637
638 /* a floor() replacement function, should be independent of ev_tstamp type */
639 static ev_tstamp noinline
640 ev_floor (ev_tstamp v)
641 {
642 /* the choice of shift factor is not terribly important */
643 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
644 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
645 #else
646 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
647 #endif
648
649 /* argument too large for an unsigned long? */
650 if (expect_false (v >= shift))
651 {
652 ev_tstamp f;
653
654 if (v == v - 1.)
655 return v; /* very large number */
656
657 f = shift * ev_floor (v * (1. / shift));
658 return f + ev_floor (v - f);
659 }
660
661 /* special treatment for negative args? */
662 if (expect_false (v < 0.))
663 {
664 ev_tstamp f = -ev_floor (-v);
665
666 return f - (f == v ? 0 : 1);
667 }
668
669 /* fits into an unsigned long */
670 return (unsigned long)v;
671 }
672
673 #endif
674
675 /*****************************************************************************/
676
677 #ifdef __linux
678 # include <sys/utsname.h>
679 #endif
680
681 static unsigned int noinline ecb_cold
682 ev_linux_version (void)
683 {
684 #ifdef __linux
685 unsigned int v = 0;
686 struct utsname buf;
687 int i;
688 char *p = buf.release;
689
690 if (uname (&buf))
691 return 0;
692
693 for (i = 3+1; --i; )
694 {
695 unsigned int c = 0;
696
697 for (;;)
698 {
699 if (*p >= '0' && *p <= '9')
700 c = c * 10 + *p++ - '0';
701 else
702 {
703 p += *p == '.';
704 break;
705 }
706 }
707
708 v = (v << 8) | c;
709 }
710
711 return v;
712 #else
713 return 0;
714 #endif
715 }
716
717 /*****************************************************************************/
718
719 #if EV_AVOID_STDIO
720 static void noinline ecb_cold
721 ev_printerr (const char *msg)
722 {
723 write (STDERR_FILENO, msg, strlen (msg));
724 }
725 #endif
726
727 static void (*syserr_cb)(const char *msg);
728
729 void ecb_cold
730 ev_set_syserr_cb (void (*cb)(const char *msg))
731 {
732 syserr_cb = cb;
733 }
734
735 static void noinline ecb_cold
736 ev_syserr (const char *msg)
737 {
738 if (!msg)
739 msg = "(libev) system error";
740
741 if (syserr_cb)
742 syserr_cb (msg);
743 else
744 {
745 #if EV_AVOID_STDIO
746 ev_printerr (msg);
747 ev_printerr (": ");
748 ev_printerr (strerror (errno));
749 ev_printerr ("\n");
750 #else
751 perror (msg);
752 #endif
753 abort ();
754 }
755 }
756
757 static void *
758 ev_realloc_emul (void *ptr, long size)
759 {
760 #if __GLIBC__
761 return realloc (ptr, size);
762 #else
763 /* some systems, notably openbsd and darwin, fail to properly
764 * implement realloc (x, 0) (as required by both ansi c-89 and
765 * the single unix specification, so work around them here.
766 */
767
768 if (size)
769 return realloc (ptr, size);
770
771 free (ptr);
772 return 0;
773 #endif
774 }
775
776 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
777
778 void ecb_cold
779 ev_set_allocator (void *(*cb)(void *ptr, long size))
780 {
781 alloc = cb;
782 }
783
784 inline_speed void *
785 ev_realloc (void *ptr, long size)
786 {
787 ptr = alloc (ptr, size);
788
789 if (!ptr && size)
790 {
791 #if EV_AVOID_STDIO
792 ev_printerr ("(libev) memory allocation failed, aborting.\n");
793 #else
794 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
795 #endif
796 abort ();
797 }
798
799 return ptr;
800 }
801
802 #define ev_malloc(size) ev_realloc (0, (size))
803 #define ev_free(ptr) ev_realloc ((ptr), 0)
804
805 /*****************************************************************************/
806
807 /* set in reify when reification needed */
808 #define EV_ANFD_REIFY 1
809
810 /* file descriptor info structure */
811 typedef struct
812 {
813 WL head;
814 unsigned char events; /* the events watched for */
815 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
816 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
817 unsigned char unused;
818 #if EV_USE_EPOLL
819 unsigned int egen; /* generation counter to counter epoll bugs */
820 #endif
821 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
822 SOCKET handle;
823 #endif
824 #if EV_USE_IOCP
825 OVERLAPPED or, ow;
826 #endif
827 } ANFD;
828
829 /* stores the pending event set for a given watcher */
830 typedef struct
831 {
832 W w;
833 int events; /* the pending event set for the given watcher */
834 } ANPENDING;
835
836 #if EV_USE_INOTIFY
837 /* hash table entry per inotify-id */
838 typedef struct
839 {
840 WL head;
841 } ANFS;
842 #endif
843
844 /* Heap Entry */
845 #if EV_HEAP_CACHE_AT
846 /* a heap element */
847 typedef struct {
848 ev_tstamp at;
849 WT w;
850 } ANHE;
851
852 #define ANHE_w(he) (he).w /* access watcher, read-write */
853 #define ANHE_at(he) (he).at /* access cached at, read-only */
854 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
855 #else
856 /* a heap element */
857 typedef WT ANHE;
858
859 #define ANHE_w(he) (he)
860 #define ANHE_at(he) (he)->at
861 #define ANHE_at_cache(he)
862 #endif
863
864 #if EV_MULTIPLICITY
865
866 struct ev_loop
867 {
868 ev_tstamp ev_rt_now;
869 #define ev_rt_now ((loop)->ev_rt_now)
870 #define VAR(name,decl) decl;
871 #include "ev_vars.h"
872 #undef VAR
873 };
874 #include "ev_wrap.h"
875
876 static struct ev_loop default_loop_struct;
877 struct ev_loop *ev_default_loop_ptr;
878
879 #else
880
881 ev_tstamp ev_rt_now;
882 #define VAR(name,decl) static decl;
883 #include "ev_vars.h"
884 #undef VAR
885
886 static int ev_default_loop_ptr;
887
888 #endif
889
890 #if EV_FEATURE_API
891 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
892 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
893 # define EV_INVOKE_PENDING invoke_cb (EV_A)
894 #else
895 # define EV_RELEASE_CB (void)0
896 # define EV_ACQUIRE_CB (void)0
897 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
898 #endif
899
900 #define EVBREAK_RECURSE 0x80
901
902 /*****************************************************************************/
903
904 #ifndef EV_HAVE_EV_TIME
905 ev_tstamp
906 ev_time (void)
907 {
908 #if EV_USE_REALTIME
909 if (expect_true (have_realtime))
910 {
911 struct timespec ts;
912 clock_gettime (CLOCK_REALTIME, &ts);
913 return ts.tv_sec + ts.tv_nsec * 1e-9;
914 }
915 #endif
916
917 struct timeval tv;
918 gettimeofday (&tv, 0);
919 return tv.tv_sec + tv.tv_usec * 1e-6;
920 }
921 #endif
922
923 inline_size ev_tstamp
924 get_clock (void)
925 {
926 #if EV_USE_MONOTONIC
927 if (expect_true (have_monotonic))
928 {
929 struct timespec ts;
930 clock_gettime (CLOCK_MONOTONIC, &ts);
931 return ts.tv_sec + ts.tv_nsec * 1e-9;
932 }
933 #endif
934
935 return ev_time ();
936 }
937
938 #if EV_MULTIPLICITY
939 ev_tstamp
940 ev_now (EV_P)
941 {
942 return ev_rt_now;
943 }
944 #endif
945
946 void
947 ev_sleep (ev_tstamp delay)
948 {
949 if (delay > 0.)
950 {
951 #if EV_USE_NANOSLEEP
952 struct timespec ts;
953
954 EV_TS_SET (ts, delay);
955 nanosleep (&ts, 0);
956 #elif defined(_WIN32)
957 Sleep ((unsigned long)(delay * 1e3));
958 #else
959 struct timeval tv;
960
961 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
962 /* something not guaranteed by newer posix versions, but guaranteed */
963 /* by older ones */
964 EV_TV_SET (tv, delay);
965 select (0, 0, 0, 0, &tv);
966 #endif
967 }
968 }
969
970 /*****************************************************************************/
971
972 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
973
974 /* find a suitable new size for the given array, */
975 /* hopefully by rounding to a nice-to-malloc size */
976 inline_size int
977 array_nextsize (int elem, int cur, int cnt)
978 {
979 int ncur = cur + 1;
980
981 do
982 ncur <<= 1;
983 while (cnt > ncur);
984
985 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
986 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
987 {
988 ncur *= elem;
989 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
990 ncur = ncur - sizeof (void *) * 4;
991 ncur /= elem;
992 }
993
994 return ncur;
995 }
996
997 static void * noinline ecb_cold
998 array_realloc (int elem, void *base, int *cur, int cnt)
999 {
1000 *cur = array_nextsize (elem, *cur, cnt);
1001 return ev_realloc (base, elem * *cur);
1002 }
1003
1004 #define array_init_zero(base,count) \
1005 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1006
1007 #define array_needsize(type,base,cur,cnt,init) \
1008 if (expect_false ((cnt) > (cur))) \
1009 { \
1010 int ecb_unused ocur_ = (cur); \
1011 (base) = (type *)array_realloc \
1012 (sizeof (type), (base), &(cur), (cnt)); \
1013 init ((base) + (ocur_), (cur) - ocur_); \
1014 }
1015
1016 #if 0
1017 #define array_slim(type,stem) \
1018 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1019 { \
1020 stem ## max = array_roundsize (stem ## cnt >> 1); \
1021 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1022 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1023 }
1024 #endif
1025
1026 #define array_free(stem, idx) \
1027 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1028
1029 /*****************************************************************************/
1030
1031 /* dummy callback for pending events */
1032 static void noinline
1033 pendingcb (EV_P_ ev_prepare *w, int revents)
1034 {
1035 }
1036
1037 void noinline
1038 ev_feed_event (EV_P_ void *w, int revents)
1039 {
1040 W w_ = (W)w;
1041 int pri = ABSPRI (w_);
1042
1043 if (expect_false (w_->pending))
1044 pendings [pri][w_->pending - 1].events |= revents;
1045 else
1046 {
1047 w_->pending = ++pendingcnt [pri];
1048 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1049 pendings [pri][w_->pending - 1].w = w_;
1050 pendings [pri][w_->pending - 1].events = revents;
1051 }
1052 }
1053
1054 inline_speed void
1055 feed_reverse (EV_P_ W w)
1056 {
1057 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1058 rfeeds [rfeedcnt++] = w;
1059 }
1060
1061 inline_size void
1062 feed_reverse_done (EV_P_ int revents)
1063 {
1064 do
1065 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1066 while (rfeedcnt);
1067 }
1068
1069 inline_speed void
1070 queue_events (EV_P_ W *events, int eventcnt, int type)
1071 {
1072 int i;
1073
1074 for (i = 0; i < eventcnt; ++i)
1075 ev_feed_event (EV_A_ events [i], type);
1076 }
1077
1078 /*****************************************************************************/
1079
1080 inline_speed void
1081 fd_event_nocheck (EV_P_ int fd, int revents)
1082 {
1083 ANFD *anfd = anfds + fd;
1084 ev_io *w;
1085
1086 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1087 {
1088 int ev = w->events & revents;
1089
1090 if (ev)
1091 ev_feed_event (EV_A_ (W)w, ev);
1092 }
1093 }
1094
1095 /* do not submit kernel events for fds that have reify set */
1096 /* because that means they changed while we were polling for new events */
1097 inline_speed void
1098 fd_event (EV_P_ int fd, int revents)
1099 {
1100 ANFD *anfd = anfds + fd;
1101
1102 if (expect_true (!anfd->reify))
1103 fd_event_nocheck (EV_A_ fd, revents);
1104 }
1105
1106 void
1107 ev_feed_fd_event (EV_P_ int fd, int revents)
1108 {
1109 if (fd >= 0 && fd < anfdmax)
1110 fd_event_nocheck (EV_A_ fd, revents);
1111 }
1112
1113 /* make sure the external fd watch events are in-sync */
1114 /* with the kernel/libev internal state */
1115 inline_size void
1116 fd_reify (EV_P)
1117 {
1118 int i;
1119
1120 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1121 for (i = 0; i < fdchangecnt; ++i)
1122 {
1123 int fd = fdchanges [i];
1124 ANFD *anfd = anfds + fd;
1125
1126 if (anfd->reify & EV__IOFDSET && anfd->head)
1127 {
1128 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1129
1130 if (handle != anfd->handle)
1131 {
1132 unsigned long arg;
1133
1134 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1135
1136 /* handle changed, but fd didn't - we need to do it in two steps */
1137 backend_modify (EV_A_ fd, anfd->events, 0);
1138 anfd->events = 0;
1139 anfd->handle = handle;
1140 }
1141 }
1142 }
1143 #endif
1144
1145 for (i = 0; i < fdchangecnt; ++i)
1146 {
1147 int fd = fdchanges [i];
1148 ANFD *anfd = anfds + fd;
1149 ev_io *w;
1150
1151 unsigned char o_events = anfd->events;
1152 unsigned char o_reify = anfd->reify;
1153
1154 anfd->reify = 0;
1155
1156 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1157 {
1158 anfd->events = 0;
1159
1160 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1161 anfd->events |= (unsigned char)w->events;
1162
1163 if (o_events != anfd->events)
1164 o_reify = EV__IOFDSET; /* actually |= */
1165 }
1166
1167 if (o_reify & EV__IOFDSET)
1168 backend_modify (EV_A_ fd, o_events, anfd->events);
1169 }
1170
1171 fdchangecnt = 0;
1172 }
1173
1174 /* something about the given fd changed */
1175 inline_size void
1176 fd_change (EV_P_ int fd, int flags)
1177 {
1178 unsigned char reify = anfds [fd].reify;
1179 anfds [fd].reify |= flags;
1180
1181 if (expect_true (!reify))
1182 {
1183 ++fdchangecnt;
1184 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1185 fdchanges [fdchangecnt - 1] = fd;
1186 }
1187 }
1188
1189 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1190 inline_speed void ecb_cold
1191 fd_kill (EV_P_ int fd)
1192 {
1193 ev_io *w;
1194
1195 while ((w = (ev_io *)anfds [fd].head))
1196 {
1197 ev_io_stop (EV_A_ w);
1198 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1199 }
1200 }
1201
1202 /* check whether the given fd is actually valid, for error recovery */
1203 inline_size int ecb_cold
1204 fd_valid (int fd)
1205 {
1206 #ifdef _WIN32
1207 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1208 #else
1209 return fcntl (fd, F_GETFD) != -1;
1210 #endif
1211 }
1212
1213 /* called on EBADF to verify fds */
1214 static void noinline ecb_cold
1215 fd_ebadf (EV_P)
1216 {
1217 int fd;
1218
1219 for (fd = 0; fd < anfdmax; ++fd)
1220 if (anfds [fd].events)
1221 if (!fd_valid (fd) && errno == EBADF)
1222 fd_kill (EV_A_ fd);
1223 }
1224
1225 /* called on ENOMEM in select/poll to kill some fds and retry */
1226 static void noinline ecb_cold
1227 fd_enomem (EV_P)
1228 {
1229 int fd;
1230
1231 for (fd = anfdmax; fd--; )
1232 if (anfds [fd].events)
1233 {
1234 fd_kill (EV_A_ fd);
1235 break;
1236 }
1237 }
1238
1239 /* usually called after fork if backend needs to re-arm all fds from scratch */
1240 static void noinline
1241 fd_rearm_all (EV_P)
1242 {
1243 int fd;
1244
1245 for (fd = 0; fd < anfdmax; ++fd)
1246 if (anfds [fd].events)
1247 {
1248 anfds [fd].events = 0;
1249 anfds [fd].emask = 0;
1250 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1251 }
1252 }
1253
1254 /* used to prepare libev internal fd's */
1255 /* this is not fork-safe */
1256 inline_speed void
1257 fd_intern (int fd)
1258 {
1259 #ifdef _WIN32
1260 unsigned long arg = 1;
1261 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1262 #else
1263 fcntl (fd, F_SETFD, FD_CLOEXEC);
1264 fcntl (fd, F_SETFL, O_NONBLOCK);
1265 #endif
1266 }
1267
1268 /*****************************************************************************/
1269
1270 /*
1271 * the heap functions want a real array index. array index 0 is guaranteed to not
1272 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1273 * the branching factor of the d-tree.
1274 */
1275
1276 /*
1277 * at the moment we allow libev the luxury of two heaps,
1278 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1279 * which is more cache-efficient.
1280 * the difference is about 5% with 50000+ watchers.
1281 */
1282 #if EV_USE_4HEAP
1283
1284 #define DHEAP 4
1285 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1286 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1287 #define UPHEAP_DONE(p,k) ((p) == (k))
1288
1289 /* away from the root */
1290 inline_speed void
1291 downheap (ANHE *heap, int N, int k)
1292 {
1293 ANHE he = heap [k];
1294 ANHE *E = heap + N + HEAP0;
1295
1296 for (;;)
1297 {
1298 ev_tstamp minat;
1299 ANHE *minpos;
1300 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1301
1302 /* find minimum child */
1303 if (expect_true (pos + DHEAP - 1 < E))
1304 {
1305 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1306 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1307 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1308 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1309 }
1310 else if (pos < E)
1311 {
1312 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1313 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1314 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1315 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1316 }
1317 else
1318 break;
1319
1320 if (ANHE_at (he) <= minat)
1321 break;
1322
1323 heap [k] = *minpos;
1324 ev_active (ANHE_w (*minpos)) = k;
1325
1326 k = minpos - heap;
1327 }
1328
1329 heap [k] = he;
1330 ev_active (ANHE_w (he)) = k;
1331 }
1332
1333 #else /* 4HEAP */
1334
1335 #define HEAP0 1
1336 #define HPARENT(k) ((k) >> 1)
1337 #define UPHEAP_DONE(p,k) (!(p))
1338
1339 /* away from the root */
1340 inline_speed void
1341 downheap (ANHE *heap, int N, int k)
1342 {
1343 ANHE he = heap [k];
1344
1345 for (;;)
1346 {
1347 int c = k << 1;
1348
1349 if (c >= N + HEAP0)
1350 break;
1351
1352 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1353 ? 1 : 0;
1354
1355 if (ANHE_at (he) <= ANHE_at (heap [c]))
1356 break;
1357
1358 heap [k] = heap [c];
1359 ev_active (ANHE_w (heap [k])) = k;
1360
1361 k = c;
1362 }
1363
1364 heap [k] = he;
1365 ev_active (ANHE_w (he)) = k;
1366 }
1367 #endif
1368
1369 /* towards the root */
1370 inline_speed void
1371 upheap (ANHE *heap, int k)
1372 {
1373 ANHE he = heap [k];
1374
1375 for (;;)
1376 {
1377 int p = HPARENT (k);
1378
1379 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1380 break;
1381
1382 heap [k] = heap [p];
1383 ev_active (ANHE_w (heap [k])) = k;
1384 k = p;
1385 }
1386
1387 heap [k] = he;
1388 ev_active (ANHE_w (he)) = k;
1389 }
1390
1391 /* move an element suitably so it is in a correct place */
1392 inline_size void
1393 adjustheap (ANHE *heap, int N, int k)
1394 {
1395 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1396 upheap (heap, k);
1397 else
1398 downheap (heap, N, k);
1399 }
1400
1401 /* rebuild the heap: this function is used only once and executed rarely */
1402 inline_size void
1403 reheap (ANHE *heap, int N)
1404 {
1405 int i;
1406
1407 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1408 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1409 for (i = 0; i < N; ++i)
1410 upheap (heap, i + HEAP0);
1411 }
1412
1413 /*****************************************************************************/
1414
1415 /* associate signal watchers to a signal signal */
1416 typedef struct
1417 {
1418 EV_ATOMIC_T pending;
1419 #if EV_MULTIPLICITY
1420 EV_P;
1421 #endif
1422 WL head;
1423 } ANSIG;
1424
1425 static ANSIG signals [EV_NSIG - 1];
1426
1427 /*****************************************************************************/
1428
1429 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1430
1431 static void noinline ecb_cold
1432 evpipe_init (EV_P)
1433 {
1434 if (!ev_is_active (&pipe_w))
1435 {
1436 # if EV_USE_EVENTFD
1437 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1438 if (evfd < 0 && errno == EINVAL)
1439 evfd = eventfd (0, 0);
1440
1441 if (evfd >= 0)
1442 {
1443 evpipe [0] = -1;
1444 fd_intern (evfd); /* doing it twice doesn't hurt */
1445 ev_io_set (&pipe_w, evfd, EV_READ);
1446 }
1447 else
1448 # endif
1449 {
1450 while (pipe (evpipe))
1451 ev_syserr ("(libev) error creating signal/async pipe");
1452
1453 fd_intern (evpipe [0]);
1454 fd_intern (evpipe [1]);
1455 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1456 }
1457
1458 ev_io_start (EV_A_ &pipe_w);
1459 ev_unref (EV_A); /* watcher should not keep loop alive */
1460 }
1461 }
1462
1463 inline_speed void
1464 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1465 {
1466 if (expect_true (*flag))
1467 return;
1468
1469 *flag = 1;
1470
1471 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1472
1473 pipe_write_skipped = 1;
1474
1475 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1476
1477 if (pipe_write_wanted)
1478 {
1479 int old_errno;
1480
1481 pipe_write_skipped = 0; /* just an optimsiation, no fence needed */
1482
1483 old_errno = errno; /* save errno because write will clobber it */
1484
1485 #if EV_USE_EVENTFD
1486 if (evfd >= 0)
1487 {
1488 uint64_t counter = 1;
1489 write (evfd, &counter, sizeof (uint64_t));
1490 }
1491 else
1492 #endif
1493 {
1494 /* win32 people keep sending patches that change this write() to send() */
1495 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1496 /* so when you think this write should be a send instead, please find out */
1497 /* where your send() is from - it's definitely not the microsoft send, and */
1498 /* tell me. thank you. */
1499 write (evpipe [1], &(evpipe [1]), 1);
1500 }
1501
1502 errno = old_errno;
1503 }
1504 }
1505
1506 /* called whenever the libev signal pipe */
1507 /* got some events (signal, async) */
1508 static void
1509 pipecb (EV_P_ ev_io *iow, int revents)
1510 {
1511 int i;
1512
1513 if (revents & EV_READ)
1514 {
1515 #if EV_USE_EVENTFD
1516 if (evfd >= 0)
1517 {
1518 uint64_t counter;
1519 read (evfd, &counter, sizeof (uint64_t));
1520 }
1521 else
1522 #endif
1523 {
1524 char dummy;
1525 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1526 read (evpipe [0], &dummy, 1);
1527 }
1528 }
1529
1530 pipe_write_skipped = 0;
1531
1532 #if EV_SIGNAL_ENABLE
1533 if (sig_pending)
1534 {
1535 sig_pending = 0;
1536
1537 for (i = EV_NSIG - 1; i--; )
1538 if (expect_false (signals [i].pending))
1539 ev_feed_signal_event (EV_A_ i + 1);
1540 }
1541 #endif
1542
1543 #if EV_ASYNC_ENABLE
1544 if (async_pending)
1545 {
1546 async_pending = 0;
1547
1548 for (i = asynccnt; i--; )
1549 if (asyncs [i]->sent)
1550 {
1551 asyncs [i]->sent = 0;
1552 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1553 }
1554 }
1555 #endif
1556 }
1557
1558 /*****************************************************************************/
1559
1560 void
1561 ev_feed_signal (int signum)
1562 {
1563 #if EV_MULTIPLICITY
1564 EV_P = signals [signum - 1].loop;
1565
1566 if (!EV_A)
1567 return;
1568 #endif
1569
1570 if (!ev_active (&pipe_w))
1571 return;
1572
1573 signals [signum - 1].pending = 1;
1574 evpipe_write (EV_A_ &sig_pending);
1575 }
1576
1577 static void
1578 ev_sighandler (int signum)
1579 {
1580 #ifdef _WIN32
1581 signal (signum, ev_sighandler);
1582 #endif
1583
1584 ev_feed_signal (signum);
1585 }
1586
1587 void noinline
1588 ev_feed_signal_event (EV_P_ int signum)
1589 {
1590 WL w;
1591
1592 if (expect_false (signum <= 0 || signum > EV_NSIG))
1593 return;
1594
1595 --signum;
1596
1597 #if EV_MULTIPLICITY
1598 /* it is permissible to try to feed a signal to the wrong loop */
1599 /* or, likely more useful, feeding a signal nobody is waiting for */
1600
1601 if (expect_false (signals [signum].loop != EV_A))
1602 return;
1603 #endif
1604
1605 signals [signum].pending = 0;
1606
1607 for (w = signals [signum].head; w; w = w->next)
1608 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1609 }
1610
1611 #if EV_USE_SIGNALFD
1612 static void
1613 sigfdcb (EV_P_ ev_io *iow, int revents)
1614 {
1615 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1616
1617 for (;;)
1618 {
1619 ssize_t res = read (sigfd, si, sizeof (si));
1620
1621 /* not ISO-C, as res might be -1, but works with SuS */
1622 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1623 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1624
1625 if (res < (ssize_t)sizeof (si))
1626 break;
1627 }
1628 }
1629 #endif
1630
1631 #endif
1632
1633 /*****************************************************************************/
1634
1635 #if EV_CHILD_ENABLE
1636 static WL childs [EV_PID_HASHSIZE];
1637
1638 static ev_signal childev;
1639
1640 #ifndef WIFCONTINUED
1641 # define WIFCONTINUED(status) 0
1642 #endif
1643
1644 /* handle a single child status event */
1645 inline_speed void
1646 child_reap (EV_P_ int chain, int pid, int status)
1647 {
1648 ev_child *w;
1649 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1650
1651 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1652 {
1653 if ((w->pid == pid || !w->pid)
1654 && (!traced || (w->flags & 1)))
1655 {
1656 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1657 w->rpid = pid;
1658 w->rstatus = status;
1659 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1660 }
1661 }
1662 }
1663
1664 #ifndef WCONTINUED
1665 # define WCONTINUED 0
1666 #endif
1667
1668 /* called on sigchld etc., calls waitpid */
1669 static void
1670 childcb (EV_P_ ev_signal *sw, int revents)
1671 {
1672 int pid, status;
1673
1674 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1675 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1676 if (!WCONTINUED
1677 || errno != EINVAL
1678 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1679 return;
1680
1681 /* make sure we are called again until all children have been reaped */
1682 /* we need to do it this way so that the callback gets called before we continue */
1683 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1684
1685 child_reap (EV_A_ pid, pid, status);
1686 if ((EV_PID_HASHSIZE) > 1)
1687 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1688 }
1689
1690 #endif
1691
1692 /*****************************************************************************/
1693
1694 #if EV_USE_IOCP
1695 # include "ev_iocp.c"
1696 #endif
1697 #if EV_USE_PORT
1698 # include "ev_port.c"
1699 #endif
1700 #if EV_USE_KQUEUE
1701 # include "ev_kqueue.c"
1702 #endif
1703 #if EV_USE_EPOLL
1704 # include "ev_epoll.c"
1705 #endif
1706 #if EV_USE_POLL
1707 # include "ev_poll.c"
1708 #endif
1709 #if EV_USE_SELECT
1710 # include "ev_select.c"
1711 #endif
1712
1713 int ecb_cold
1714 ev_version_major (void)
1715 {
1716 return EV_VERSION_MAJOR;
1717 }
1718
1719 int ecb_cold
1720 ev_version_minor (void)
1721 {
1722 return EV_VERSION_MINOR;
1723 }
1724
1725 /* return true if we are running with elevated privileges and should ignore env variables */
1726 int inline_size ecb_cold
1727 enable_secure (void)
1728 {
1729 #ifdef _WIN32
1730 return 0;
1731 #else
1732 return getuid () != geteuid ()
1733 || getgid () != getegid ();
1734 #endif
1735 }
1736
1737 unsigned int ecb_cold
1738 ev_supported_backends (void)
1739 {
1740 unsigned int flags = 0;
1741
1742 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1743 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1744 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1745 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1746 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1747
1748 return flags;
1749 }
1750
1751 unsigned int ecb_cold
1752 ev_recommended_backends (void)
1753 {
1754 unsigned int flags = ev_supported_backends ();
1755
1756 #ifndef __NetBSD__
1757 /* kqueue is borked on everything but netbsd apparently */
1758 /* it usually doesn't work correctly on anything but sockets and pipes */
1759 flags &= ~EVBACKEND_KQUEUE;
1760 #endif
1761 #ifdef __APPLE__
1762 /* only select works correctly on that "unix-certified" platform */
1763 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1764 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1765 #endif
1766 #ifdef __FreeBSD__
1767 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1768 #endif
1769
1770 return flags;
1771 }
1772
1773 unsigned int ecb_cold
1774 ev_embeddable_backends (void)
1775 {
1776 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1777
1778 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1779 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1780 flags &= ~EVBACKEND_EPOLL;
1781
1782 return flags;
1783 }
1784
1785 unsigned int
1786 ev_backend (EV_P)
1787 {
1788 return backend;
1789 }
1790
1791 #if EV_FEATURE_API
1792 unsigned int
1793 ev_iteration (EV_P)
1794 {
1795 return loop_count;
1796 }
1797
1798 unsigned int
1799 ev_depth (EV_P)
1800 {
1801 return loop_depth;
1802 }
1803
1804 void
1805 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1806 {
1807 io_blocktime = interval;
1808 }
1809
1810 void
1811 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1812 {
1813 timeout_blocktime = interval;
1814 }
1815
1816 void
1817 ev_set_userdata (EV_P_ void *data)
1818 {
1819 userdata = data;
1820 }
1821
1822 void *
1823 ev_userdata (EV_P)
1824 {
1825 return userdata;
1826 }
1827
1828 void
1829 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1830 {
1831 invoke_cb = invoke_pending_cb;
1832 }
1833
1834 void
1835 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1836 {
1837 release_cb = release;
1838 acquire_cb = acquire;
1839 }
1840 #endif
1841
1842 /* initialise a loop structure, must be zero-initialised */
1843 static void noinline ecb_cold
1844 loop_init (EV_P_ unsigned int flags)
1845 {
1846 if (!backend)
1847 {
1848 origflags = flags;
1849
1850 #if EV_USE_REALTIME
1851 if (!have_realtime)
1852 {
1853 struct timespec ts;
1854
1855 if (!clock_gettime (CLOCK_REALTIME, &ts))
1856 have_realtime = 1;
1857 }
1858 #endif
1859
1860 #if EV_USE_MONOTONIC
1861 if (!have_monotonic)
1862 {
1863 struct timespec ts;
1864
1865 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1866 have_monotonic = 1;
1867 }
1868 #endif
1869
1870 /* pid check not overridable via env */
1871 #ifndef _WIN32
1872 if (flags & EVFLAG_FORKCHECK)
1873 curpid = getpid ();
1874 #endif
1875
1876 if (!(flags & EVFLAG_NOENV)
1877 && !enable_secure ()
1878 && getenv ("LIBEV_FLAGS"))
1879 flags = atoi (getenv ("LIBEV_FLAGS"));
1880
1881 ev_rt_now = ev_time ();
1882 mn_now = get_clock ();
1883 now_floor = mn_now;
1884 rtmn_diff = ev_rt_now - mn_now;
1885 #if EV_FEATURE_API
1886 invoke_cb = ev_invoke_pending;
1887 #endif
1888
1889 io_blocktime = 0.;
1890 timeout_blocktime = 0.;
1891 backend = 0;
1892 backend_fd = -1;
1893 sig_pending = 0;
1894 #if EV_ASYNC_ENABLE
1895 async_pending = 0;
1896 #endif
1897 pipe_write_skipped = 0;
1898 pipe_write_wanted = 0;
1899 #if EV_USE_INOTIFY
1900 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1901 #endif
1902 #if EV_USE_SIGNALFD
1903 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1904 #endif
1905
1906 if (!(flags & EVBACKEND_MASK))
1907 flags |= ev_recommended_backends ();
1908
1909 #if EV_USE_IOCP
1910 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1911 #endif
1912 #if EV_USE_PORT
1913 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1914 #endif
1915 #if EV_USE_KQUEUE
1916 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1917 #endif
1918 #if EV_USE_EPOLL
1919 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1920 #endif
1921 #if EV_USE_POLL
1922 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1923 #endif
1924 #if EV_USE_SELECT
1925 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1926 #endif
1927
1928 ev_prepare_init (&pending_w, pendingcb);
1929
1930 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1931 ev_init (&pipe_w, pipecb);
1932 ev_set_priority (&pipe_w, EV_MAXPRI);
1933 #endif
1934 }
1935 }
1936
1937 /* free up a loop structure */
1938 void ecb_cold
1939 ev_loop_destroy (EV_P)
1940 {
1941 int i;
1942
1943 #if EV_MULTIPLICITY
1944 /* mimic free (0) */
1945 if (!EV_A)
1946 return;
1947 #endif
1948
1949 #if EV_CLEANUP_ENABLE
1950 /* queue cleanup watchers (and execute them) */
1951 if (expect_false (cleanupcnt))
1952 {
1953 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1954 EV_INVOKE_PENDING;
1955 }
1956 #endif
1957
1958 #if EV_CHILD_ENABLE
1959 if (ev_is_active (&childev))
1960 {
1961 ev_ref (EV_A); /* child watcher */
1962 ev_signal_stop (EV_A_ &childev);
1963 }
1964 #endif
1965
1966 if (ev_is_active (&pipe_w))
1967 {
1968 /*ev_ref (EV_A);*/
1969 /*ev_io_stop (EV_A_ &pipe_w);*/
1970
1971 #if EV_USE_EVENTFD
1972 if (evfd >= 0)
1973 close (evfd);
1974 #endif
1975
1976 if (evpipe [0] >= 0)
1977 {
1978 EV_WIN32_CLOSE_FD (evpipe [0]);
1979 EV_WIN32_CLOSE_FD (evpipe [1]);
1980 }
1981 }
1982
1983 #if EV_USE_SIGNALFD
1984 if (ev_is_active (&sigfd_w))
1985 close (sigfd);
1986 #endif
1987
1988 #if EV_USE_INOTIFY
1989 if (fs_fd >= 0)
1990 close (fs_fd);
1991 #endif
1992
1993 if (backend_fd >= 0)
1994 close (backend_fd);
1995
1996 #if EV_USE_IOCP
1997 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1998 #endif
1999 #if EV_USE_PORT
2000 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2001 #endif
2002 #if EV_USE_KQUEUE
2003 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2004 #endif
2005 #if EV_USE_EPOLL
2006 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2007 #endif
2008 #if EV_USE_POLL
2009 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2010 #endif
2011 #if EV_USE_SELECT
2012 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2013 #endif
2014
2015 for (i = NUMPRI; i--; )
2016 {
2017 array_free (pending, [i]);
2018 #if EV_IDLE_ENABLE
2019 array_free (idle, [i]);
2020 #endif
2021 }
2022
2023 ev_free (anfds); anfds = 0; anfdmax = 0;
2024
2025 /* have to use the microsoft-never-gets-it-right macro */
2026 array_free (rfeed, EMPTY);
2027 array_free (fdchange, EMPTY);
2028 array_free (timer, EMPTY);
2029 #if EV_PERIODIC_ENABLE
2030 array_free (periodic, EMPTY);
2031 #endif
2032 #if EV_FORK_ENABLE
2033 array_free (fork, EMPTY);
2034 #endif
2035 #if EV_CLEANUP_ENABLE
2036 array_free (cleanup, EMPTY);
2037 #endif
2038 array_free (prepare, EMPTY);
2039 array_free (check, EMPTY);
2040 #if EV_ASYNC_ENABLE
2041 array_free (async, EMPTY);
2042 #endif
2043
2044 backend = 0;
2045
2046 #if EV_MULTIPLICITY
2047 if (ev_is_default_loop (EV_A))
2048 #endif
2049 ev_default_loop_ptr = 0;
2050 #if EV_MULTIPLICITY
2051 else
2052 ev_free (EV_A);
2053 #endif
2054 }
2055
2056 #if EV_USE_INOTIFY
2057 inline_size void infy_fork (EV_P);
2058 #endif
2059
2060 inline_size void
2061 loop_fork (EV_P)
2062 {
2063 #if EV_USE_PORT
2064 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2065 #endif
2066 #if EV_USE_KQUEUE
2067 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2068 #endif
2069 #if EV_USE_EPOLL
2070 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2071 #endif
2072 #if EV_USE_INOTIFY
2073 infy_fork (EV_A);
2074 #endif
2075
2076 if (ev_is_active (&pipe_w))
2077 {
2078 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2079
2080 ev_ref (EV_A);
2081 ev_io_stop (EV_A_ &pipe_w);
2082
2083 #if EV_USE_EVENTFD
2084 if (evfd >= 0)
2085 close (evfd);
2086 #endif
2087
2088 if (evpipe [0] >= 0)
2089 {
2090 EV_WIN32_CLOSE_FD (evpipe [0]);
2091 EV_WIN32_CLOSE_FD (evpipe [1]);
2092 }
2093
2094 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2095 evpipe_init (EV_A);
2096 /* now iterate over everything, in case we missed something */
2097 pipecb (EV_A_ &pipe_w, EV_READ);
2098 #endif
2099 }
2100
2101 postfork = 0;
2102 }
2103
2104 #if EV_MULTIPLICITY
2105
2106 struct ev_loop * ecb_cold
2107 ev_loop_new (unsigned int flags)
2108 {
2109 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2110
2111 memset (EV_A, 0, sizeof (struct ev_loop));
2112 loop_init (EV_A_ flags);
2113
2114 if (ev_backend (EV_A))
2115 return EV_A;
2116
2117 ev_free (EV_A);
2118 return 0;
2119 }
2120
2121 #endif /* multiplicity */
2122
2123 #if EV_VERIFY
2124 static void noinline ecb_cold
2125 verify_watcher (EV_P_ W w)
2126 {
2127 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2128
2129 if (w->pending)
2130 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2131 }
2132
2133 static void noinline ecb_cold
2134 verify_heap (EV_P_ ANHE *heap, int N)
2135 {
2136 int i;
2137
2138 for (i = HEAP0; i < N + HEAP0; ++i)
2139 {
2140 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2141 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2142 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2143
2144 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2145 }
2146 }
2147
2148 static void noinline ecb_cold
2149 array_verify (EV_P_ W *ws, int cnt)
2150 {
2151 while (cnt--)
2152 {
2153 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2154 verify_watcher (EV_A_ ws [cnt]);
2155 }
2156 }
2157 #endif
2158
2159 #if EV_FEATURE_API
2160 void ecb_cold
2161 ev_verify (EV_P)
2162 {
2163 #if EV_VERIFY
2164 int i;
2165 WL w;
2166
2167 assert (activecnt >= -1);
2168
2169 assert (fdchangemax >= fdchangecnt);
2170 for (i = 0; i < fdchangecnt; ++i)
2171 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2172
2173 assert (anfdmax >= 0);
2174 for (i = 0; i < anfdmax; ++i)
2175 for (w = anfds [i].head; w; w = w->next)
2176 {
2177 verify_watcher (EV_A_ (W)w);
2178 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2179 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2180 }
2181
2182 assert (timermax >= timercnt);
2183 verify_heap (EV_A_ timers, timercnt);
2184
2185 #if EV_PERIODIC_ENABLE
2186 assert (periodicmax >= periodiccnt);
2187 verify_heap (EV_A_ periodics, periodiccnt);
2188 #endif
2189
2190 for (i = NUMPRI; i--; )
2191 {
2192 assert (pendingmax [i] >= pendingcnt [i]);
2193 #if EV_IDLE_ENABLE
2194 assert (idleall >= 0);
2195 assert (idlemax [i] >= idlecnt [i]);
2196 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2197 #endif
2198 }
2199
2200 #if EV_FORK_ENABLE
2201 assert (forkmax >= forkcnt);
2202 array_verify (EV_A_ (W *)forks, forkcnt);
2203 #endif
2204
2205 #if EV_CLEANUP_ENABLE
2206 assert (cleanupmax >= cleanupcnt);
2207 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2208 #endif
2209
2210 #if EV_ASYNC_ENABLE
2211 assert (asyncmax >= asynccnt);
2212 array_verify (EV_A_ (W *)asyncs, asynccnt);
2213 #endif
2214
2215 #if EV_PREPARE_ENABLE
2216 assert (preparemax >= preparecnt);
2217 array_verify (EV_A_ (W *)prepares, preparecnt);
2218 #endif
2219
2220 #if EV_CHECK_ENABLE
2221 assert (checkmax >= checkcnt);
2222 array_verify (EV_A_ (W *)checks, checkcnt);
2223 #endif
2224
2225 # if 0
2226 #if EV_CHILD_ENABLE
2227 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2228 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2229 #endif
2230 # endif
2231 #endif
2232 }
2233 #endif
2234
2235 #if EV_MULTIPLICITY
2236 struct ev_loop * ecb_cold
2237 #else
2238 int
2239 #endif
2240 ev_default_loop (unsigned int flags)
2241 {
2242 if (!ev_default_loop_ptr)
2243 {
2244 #if EV_MULTIPLICITY
2245 EV_P = ev_default_loop_ptr = &default_loop_struct;
2246 #else
2247 ev_default_loop_ptr = 1;
2248 #endif
2249
2250 loop_init (EV_A_ flags);
2251
2252 if (ev_backend (EV_A))
2253 {
2254 #if EV_CHILD_ENABLE
2255 ev_signal_init (&childev, childcb, SIGCHLD);
2256 ev_set_priority (&childev, EV_MAXPRI);
2257 ev_signal_start (EV_A_ &childev);
2258 ev_unref (EV_A); /* child watcher should not keep loop alive */
2259 #endif
2260 }
2261 else
2262 ev_default_loop_ptr = 0;
2263 }
2264
2265 return ev_default_loop_ptr;
2266 }
2267
2268 void
2269 ev_loop_fork (EV_P)
2270 {
2271 postfork = 1; /* must be in line with ev_default_fork */
2272 }
2273
2274 /*****************************************************************************/
2275
2276 void
2277 ev_invoke (EV_P_ void *w, int revents)
2278 {
2279 EV_CB_INVOKE ((W)w, revents);
2280 }
2281
2282 unsigned int
2283 ev_pending_count (EV_P)
2284 {
2285 int pri;
2286 unsigned int count = 0;
2287
2288 for (pri = NUMPRI; pri--; )
2289 count += pendingcnt [pri];
2290
2291 return count;
2292 }
2293
2294 void noinline
2295 ev_invoke_pending (EV_P)
2296 {
2297 int pri;
2298
2299 for (pri = NUMPRI; pri--; )
2300 while (pendingcnt [pri])
2301 {
2302 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2303
2304 p->w->pending = 0;
2305 EV_CB_INVOKE (p->w, p->events);
2306 EV_FREQUENT_CHECK;
2307 }
2308 }
2309
2310 #if EV_IDLE_ENABLE
2311 /* make idle watchers pending. this handles the "call-idle */
2312 /* only when higher priorities are idle" logic */
2313 inline_size void
2314 idle_reify (EV_P)
2315 {
2316 if (expect_false (idleall))
2317 {
2318 int pri;
2319
2320 for (pri = NUMPRI; pri--; )
2321 {
2322 if (pendingcnt [pri])
2323 break;
2324
2325 if (idlecnt [pri])
2326 {
2327 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2328 break;
2329 }
2330 }
2331 }
2332 }
2333 #endif
2334
2335 /* make timers pending */
2336 inline_size void
2337 timers_reify (EV_P)
2338 {
2339 EV_FREQUENT_CHECK;
2340
2341 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2342 {
2343 do
2344 {
2345 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2346
2347 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2348
2349 /* first reschedule or stop timer */
2350 if (w->repeat)
2351 {
2352 ev_at (w) += w->repeat;
2353 if (ev_at (w) < mn_now)
2354 ev_at (w) = mn_now;
2355
2356 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2357
2358 ANHE_at_cache (timers [HEAP0]);
2359 downheap (timers, timercnt, HEAP0);
2360 }
2361 else
2362 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2363
2364 EV_FREQUENT_CHECK;
2365 feed_reverse (EV_A_ (W)w);
2366 }
2367 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2368
2369 feed_reverse_done (EV_A_ EV_TIMER);
2370 }
2371 }
2372
2373 #if EV_PERIODIC_ENABLE
2374
2375 static void noinline
2376 periodic_recalc (EV_P_ ev_periodic *w)
2377 {
2378 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2379 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2380
2381 /* the above almost always errs on the low side */
2382 while (at <= ev_rt_now)
2383 {
2384 ev_tstamp nat = at + w->interval;
2385
2386 /* when resolution fails us, we use ev_rt_now */
2387 if (expect_false (nat == at))
2388 {
2389 at = ev_rt_now;
2390 break;
2391 }
2392
2393 at = nat;
2394 }
2395
2396 ev_at (w) = at;
2397 }
2398
2399 /* make periodics pending */
2400 inline_size void
2401 periodics_reify (EV_P)
2402 {
2403 EV_FREQUENT_CHECK;
2404
2405 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2406 {
2407 int feed_count = 0;
2408
2409 do
2410 {
2411 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2412
2413 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2414
2415 /* first reschedule or stop timer */
2416 if (w->reschedule_cb)
2417 {
2418 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2419
2420 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2421
2422 ANHE_at_cache (periodics [HEAP0]);
2423 downheap (periodics, periodiccnt, HEAP0);
2424 }
2425 else if (w->interval)
2426 {
2427 periodic_recalc (EV_A_ w);
2428 ANHE_at_cache (periodics [HEAP0]);
2429 downheap (periodics, periodiccnt, HEAP0);
2430 }
2431 else
2432 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2433
2434 EV_FREQUENT_CHECK;
2435 feed_reverse (EV_A_ (W)w);
2436 }
2437 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2438
2439 feed_reverse_done (EV_A_ EV_PERIODIC);
2440 }
2441 }
2442
2443 /* simply recalculate all periodics */
2444 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2445 static void noinline ecb_cold
2446 periodics_reschedule (EV_P)
2447 {
2448 int i;
2449
2450 /* adjust periodics after time jump */
2451 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2452 {
2453 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2454
2455 if (w->reschedule_cb)
2456 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2457 else if (w->interval)
2458 periodic_recalc (EV_A_ w);
2459
2460 ANHE_at_cache (periodics [i]);
2461 }
2462
2463 reheap (periodics, periodiccnt);
2464 }
2465 #endif
2466
2467 /* adjust all timers by a given offset */
2468 static void noinline ecb_cold
2469 timers_reschedule (EV_P_ ev_tstamp adjust)
2470 {
2471 int i;
2472
2473 for (i = 0; i < timercnt; ++i)
2474 {
2475 ANHE *he = timers + i + HEAP0;
2476 ANHE_w (*he)->at += adjust;
2477 ANHE_at_cache (*he);
2478 }
2479 }
2480
2481 /* fetch new monotonic and realtime times from the kernel */
2482 /* also detect if there was a timejump, and act accordingly */
2483 inline_speed void
2484 time_update (EV_P_ ev_tstamp max_block)
2485 {
2486 #if EV_USE_MONOTONIC
2487 if (expect_true (have_monotonic))
2488 {
2489 int i;
2490 ev_tstamp odiff = rtmn_diff;
2491
2492 mn_now = get_clock ();
2493
2494 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2495 /* interpolate in the meantime */
2496 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2497 {
2498 ev_rt_now = rtmn_diff + mn_now;
2499 return;
2500 }
2501
2502 now_floor = mn_now;
2503 ev_rt_now = ev_time ();
2504
2505 /* loop a few times, before making important decisions.
2506 * on the choice of "4": one iteration isn't enough,
2507 * in case we get preempted during the calls to
2508 * ev_time and get_clock. a second call is almost guaranteed
2509 * to succeed in that case, though. and looping a few more times
2510 * doesn't hurt either as we only do this on time-jumps or
2511 * in the unlikely event of having been preempted here.
2512 */
2513 for (i = 4; --i; )
2514 {
2515 ev_tstamp diff;
2516 rtmn_diff = ev_rt_now - mn_now;
2517
2518 diff = odiff - rtmn_diff;
2519
2520 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2521 return; /* all is well */
2522
2523 ev_rt_now = ev_time ();
2524 mn_now = get_clock ();
2525 now_floor = mn_now;
2526 }
2527
2528 /* no timer adjustment, as the monotonic clock doesn't jump */
2529 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2530 # if EV_PERIODIC_ENABLE
2531 periodics_reschedule (EV_A);
2532 # endif
2533 }
2534 else
2535 #endif
2536 {
2537 ev_rt_now = ev_time ();
2538
2539 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2540 {
2541 /* adjust timers. this is easy, as the offset is the same for all of them */
2542 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2543 #if EV_PERIODIC_ENABLE
2544 periodics_reschedule (EV_A);
2545 #endif
2546 }
2547
2548 mn_now = ev_rt_now;
2549 }
2550 }
2551
2552 void
2553 ev_run (EV_P_ int flags)
2554 {
2555 #if EV_FEATURE_API
2556 ++loop_depth;
2557 #endif
2558
2559 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2560
2561 loop_done = EVBREAK_CANCEL;
2562
2563 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2564
2565 do
2566 {
2567 #if EV_VERIFY >= 2
2568 ev_verify (EV_A);
2569 #endif
2570
2571 #ifndef _WIN32
2572 if (expect_false (curpid)) /* penalise the forking check even more */
2573 if (expect_false (getpid () != curpid))
2574 {
2575 curpid = getpid ();
2576 postfork = 1;
2577 }
2578 #endif
2579
2580 #if EV_FORK_ENABLE
2581 /* we might have forked, so queue fork handlers */
2582 if (expect_false (postfork))
2583 if (forkcnt)
2584 {
2585 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2586 EV_INVOKE_PENDING;
2587 }
2588 #endif
2589
2590 #if EV_PREPARE_ENABLE
2591 /* queue prepare watchers (and execute them) */
2592 if (expect_false (preparecnt))
2593 {
2594 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2595 EV_INVOKE_PENDING;
2596 }
2597 #endif
2598
2599 if (expect_false (loop_done))
2600 break;
2601
2602 /* we might have forked, so reify kernel state if necessary */
2603 if (expect_false (postfork))
2604 loop_fork (EV_A);
2605
2606 /* update fd-related kernel structures */
2607 fd_reify (EV_A);
2608
2609 /* calculate blocking time */
2610 {
2611 ev_tstamp waittime = 0.;
2612 ev_tstamp sleeptime = 0.;
2613
2614 /* remember old timestamp for io_blocktime calculation */
2615 ev_tstamp prev_mn_now = mn_now;
2616
2617 /* update time to cancel out callback processing overhead */
2618 time_update (EV_A_ 1e100);
2619
2620 /* from now on, we want a pipe-wake-up */
2621 pipe_write_wanted = 1;
2622
2623 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
2624
2625 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2626 {
2627 waittime = MAX_BLOCKTIME;
2628
2629 if (timercnt)
2630 {
2631 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2632 if (waittime > to) waittime = to;
2633 }
2634
2635 #if EV_PERIODIC_ENABLE
2636 if (periodiccnt)
2637 {
2638 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2639 if (waittime > to) waittime = to;
2640 }
2641 #endif
2642
2643 /* don't let timeouts decrease the waittime below timeout_blocktime */
2644 if (expect_false (waittime < timeout_blocktime))
2645 waittime = timeout_blocktime;
2646
2647 /* at this point, we NEED to wait, so we have to ensure */
2648 /* to pass a minimum nonzero value to the backend */
2649 if (expect_false (waittime < backend_mintime))
2650 waittime = backend_mintime;
2651
2652 /* extra check because io_blocktime is commonly 0 */
2653 if (expect_false (io_blocktime))
2654 {
2655 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2656
2657 if (sleeptime > waittime - backend_mintime)
2658 sleeptime = waittime - backend_mintime;
2659
2660 if (expect_true (sleeptime > 0.))
2661 {
2662 ev_sleep (sleeptime);
2663 waittime -= sleeptime;
2664 }
2665 }
2666 }
2667
2668 #if EV_FEATURE_API
2669 ++loop_count;
2670 #endif
2671 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2672 backend_poll (EV_A_ waittime);
2673 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2674
2675 pipe_write_wanted = 0; /* just an optimsiation, no fence needed */
2676
2677 if (pipe_write_skipped)
2678 {
2679 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
2680 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2681 }
2682
2683
2684 /* update ev_rt_now, do magic */
2685 time_update (EV_A_ waittime + sleeptime);
2686 }
2687
2688 /* queue pending timers and reschedule them */
2689 timers_reify (EV_A); /* relative timers called last */
2690 #if EV_PERIODIC_ENABLE
2691 periodics_reify (EV_A); /* absolute timers called first */
2692 #endif
2693
2694 #if EV_IDLE_ENABLE
2695 /* queue idle watchers unless other events are pending */
2696 idle_reify (EV_A);
2697 #endif
2698
2699 #if EV_CHECK_ENABLE
2700 /* queue check watchers, to be executed first */
2701 if (expect_false (checkcnt))
2702 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2703 #endif
2704
2705 EV_INVOKE_PENDING;
2706 }
2707 while (expect_true (
2708 activecnt
2709 && !loop_done
2710 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2711 ));
2712
2713 if (loop_done == EVBREAK_ONE)
2714 loop_done = EVBREAK_CANCEL;
2715
2716 #if EV_FEATURE_API
2717 --loop_depth;
2718 #endif
2719 }
2720
2721 void
2722 ev_break (EV_P_ int how)
2723 {
2724 loop_done = how;
2725 }
2726
2727 void
2728 ev_ref (EV_P)
2729 {
2730 ++activecnt;
2731 }
2732
2733 void
2734 ev_unref (EV_P)
2735 {
2736 --activecnt;
2737 }
2738
2739 void
2740 ev_now_update (EV_P)
2741 {
2742 time_update (EV_A_ 1e100);
2743 }
2744
2745 void
2746 ev_suspend (EV_P)
2747 {
2748 ev_now_update (EV_A);
2749 }
2750
2751 void
2752 ev_resume (EV_P)
2753 {
2754 ev_tstamp mn_prev = mn_now;
2755
2756 ev_now_update (EV_A);
2757 timers_reschedule (EV_A_ mn_now - mn_prev);
2758 #if EV_PERIODIC_ENABLE
2759 /* TODO: really do this? */
2760 periodics_reschedule (EV_A);
2761 #endif
2762 }
2763
2764 /*****************************************************************************/
2765 /* singly-linked list management, used when the expected list length is short */
2766
2767 inline_size void
2768 wlist_add (WL *head, WL elem)
2769 {
2770 elem->next = *head;
2771 *head = elem;
2772 }
2773
2774 inline_size void
2775 wlist_del (WL *head, WL elem)
2776 {
2777 while (*head)
2778 {
2779 if (expect_true (*head == elem))
2780 {
2781 *head = elem->next;
2782 break;
2783 }
2784
2785 head = &(*head)->next;
2786 }
2787 }
2788
2789 /* internal, faster, version of ev_clear_pending */
2790 inline_speed void
2791 clear_pending (EV_P_ W w)
2792 {
2793 if (w->pending)
2794 {
2795 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2796 w->pending = 0;
2797 }
2798 }
2799
2800 int
2801 ev_clear_pending (EV_P_ void *w)
2802 {
2803 W w_ = (W)w;
2804 int pending = w_->pending;
2805
2806 if (expect_true (pending))
2807 {
2808 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2809 p->w = (W)&pending_w;
2810 w_->pending = 0;
2811 return p->events;
2812 }
2813 else
2814 return 0;
2815 }
2816
2817 inline_size void
2818 pri_adjust (EV_P_ W w)
2819 {
2820 int pri = ev_priority (w);
2821 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2822 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2823 ev_set_priority (w, pri);
2824 }
2825
2826 inline_speed void
2827 ev_start (EV_P_ W w, int active)
2828 {
2829 pri_adjust (EV_A_ w);
2830 w->active = active;
2831 ev_ref (EV_A);
2832 }
2833
2834 inline_size void
2835 ev_stop (EV_P_ W w)
2836 {
2837 ev_unref (EV_A);
2838 w->active = 0;
2839 }
2840
2841 /*****************************************************************************/
2842
2843 void noinline
2844 ev_io_start (EV_P_ ev_io *w)
2845 {
2846 int fd = w->fd;
2847
2848 if (expect_false (ev_is_active (w)))
2849 return;
2850
2851 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2852 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2853
2854 EV_FREQUENT_CHECK;
2855
2856 ev_start (EV_A_ (W)w, 1);
2857 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2858 wlist_add (&anfds[fd].head, (WL)w);
2859
2860 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2861 w->events &= ~EV__IOFDSET;
2862
2863 EV_FREQUENT_CHECK;
2864 }
2865
2866 void noinline
2867 ev_io_stop (EV_P_ ev_io *w)
2868 {
2869 clear_pending (EV_A_ (W)w);
2870 if (expect_false (!ev_is_active (w)))
2871 return;
2872
2873 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2874
2875 EV_FREQUENT_CHECK;
2876
2877 wlist_del (&anfds[w->fd].head, (WL)w);
2878 ev_stop (EV_A_ (W)w);
2879
2880 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2881
2882 EV_FREQUENT_CHECK;
2883 }
2884
2885 void noinline
2886 ev_timer_start (EV_P_ ev_timer *w)
2887 {
2888 if (expect_false (ev_is_active (w)))
2889 return;
2890
2891 ev_at (w) += mn_now;
2892
2893 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2894
2895 EV_FREQUENT_CHECK;
2896
2897 ++timercnt;
2898 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2899 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2900 ANHE_w (timers [ev_active (w)]) = (WT)w;
2901 ANHE_at_cache (timers [ev_active (w)]);
2902 upheap (timers, ev_active (w));
2903
2904 EV_FREQUENT_CHECK;
2905
2906 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2907 }
2908
2909 void noinline
2910 ev_timer_stop (EV_P_ ev_timer *w)
2911 {
2912 clear_pending (EV_A_ (W)w);
2913 if (expect_false (!ev_is_active (w)))
2914 return;
2915
2916 EV_FREQUENT_CHECK;
2917
2918 {
2919 int active = ev_active (w);
2920
2921 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2922
2923 --timercnt;
2924
2925 if (expect_true (active < timercnt + HEAP0))
2926 {
2927 timers [active] = timers [timercnt + HEAP0];
2928 adjustheap (timers, timercnt, active);
2929 }
2930 }
2931
2932 ev_at (w) -= mn_now;
2933
2934 ev_stop (EV_A_ (W)w);
2935
2936 EV_FREQUENT_CHECK;
2937 }
2938
2939 void noinline
2940 ev_timer_again (EV_P_ ev_timer *w)
2941 {
2942 EV_FREQUENT_CHECK;
2943
2944 if (ev_is_active (w))
2945 {
2946 if (w->repeat)
2947 {
2948 ev_at (w) = mn_now + w->repeat;
2949 ANHE_at_cache (timers [ev_active (w)]);
2950 adjustheap (timers, timercnt, ev_active (w));
2951 }
2952 else
2953 ev_timer_stop (EV_A_ w);
2954 }
2955 else if (w->repeat)
2956 {
2957 ev_at (w) = w->repeat;
2958 ev_timer_start (EV_A_ w);
2959 }
2960
2961 EV_FREQUENT_CHECK;
2962 }
2963
2964 ev_tstamp
2965 ev_timer_remaining (EV_P_ ev_timer *w)
2966 {
2967 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2968 }
2969
2970 #if EV_PERIODIC_ENABLE
2971 void noinline
2972 ev_periodic_start (EV_P_ ev_periodic *w)
2973 {
2974 if (expect_false (ev_is_active (w)))
2975 return;
2976
2977 if (w->reschedule_cb)
2978 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2979 else if (w->interval)
2980 {
2981 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2982 periodic_recalc (EV_A_ w);
2983 }
2984 else
2985 ev_at (w) = w->offset;
2986
2987 EV_FREQUENT_CHECK;
2988
2989 ++periodiccnt;
2990 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2991 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2992 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2993 ANHE_at_cache (periodics [ev_active (w)]);
2994 upheap (periodics, ev_active (w));
2995
2996 EV_FREQUENT_CHECK;
2997
2998 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2999 }
3000
3001 void noinline
3002 ev_periodic_stop (EV_P_ ev_periodic *w)
3003 {
3004 clear_pending (EV_A_ (W)w);
3005 if (expect_false (!ev_is_active (w)))
3006 return;
3007
3008 EV_FREQUENT_CHECK;
3009
3010 {
3011 int active = ev_active (w);
3012
3013 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3014
3015 --periodiccnt;
3016
3017 if (expect_true (active < periodiccnt + HEAP0))
3018 {
3019 periodics [active] = periodics [periodiccnt + HEAP0];
3020 adjustheap (periodics, periodiccnt, active);
3021 }
3022 }
3023
3024 ev_stop (EV_A_ (W)w);
3025
3026 EV_FREQUENT_CHECK;
3027 }
3028
3029 void noinline
3030 ev_periodic_again (EV_P_ ev_periodic *w)
3031 {
3032 /* TODO: use adjustheap and recalculation */
3033 ev_periodic_stop (EV_A_ w);
3034 ev_periodic_start (EV_A_ w);
3035 }
3036 #endif
3037
3038 #ifndef SA_RESTART
3039 # define SA_RESTART 0
3040 #endif
3041
3042 #if EV_SIGNAL_ENABLE
3043
3044 void noinline
3045 ev_signal_start (EV_P_ ev_signal *w)
3046 {
3047 if (expect_false (ev_is_active (w)))
3048 return;
3049
3050 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3051
3052 #if EV_MULTIPLICITY
3053 assert (("libev: a signal must not be attached to two different loops",
3054 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3055
3056 signals [w->signum - 1].loop = EV_A;
3057 #endif
3058
3059 EV_FREQUENT_CHECK;
3060
3061 #if EV_USE_SIGNALFD
3062 if (sigfd == -2)
3063 {
3064 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3065 if (sigfd < 0 && errno == EINVAL)
3066 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3067
3068 if (sigfd >= 0)
3069 {
3070 fd_intern (sigfd); /* doing it twice will not hurt */
3071
3072 sigemptyset (&sigfd_set);
3073
3074 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3075 ev_set_priority (&sigfd_w, EV_MAXPRI);
3076 ev_io_start (EV_A_ &sigfd_w);
3077 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3078 }
3079 }
3080
3081 if (sigfd >= 0)
3082 {
3083 /* TODO: check .head */
3084 sigaddset (&sigfd_set, w->signum);
3085 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3086
3087 signalfd (sigfd, &sigfd_set, 0);
3088 }
3089 #endif
3090
3091 ev_start (EV_A_ (W)w, 1);
3092 wlist_add (&signals [w->signum - 1].head, (WL)w);
3093
3094 if (!((WL)w)->next)
3095 # if EV_USE_SIGNALFD
3096 if (sigfd < 0) /*TODO*/
3097 # endif
3098 {
3099 # ifdef _WIN32
3100 evpipe_init (EV_A);
3101
3102 signal (w->signum, ev_sighandler);
3103 # else
3104 struct sigaction sa;
3105
3106 evpipe_init (EV_A);
3107
3108 sa.sa_handler = ev_sighandler;
3109 sigfillset (&sa.sa_mask);
3110 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3111 sigaction (w->signum, &sa, 0);
3112
3113 if (origflags & EVFLAG_NOSIGMASK)
3114 {
3115 sigemptyset (&sa.sa_mask);
3116 sigaddset (&sa.sa_mask, w->signum);
3117 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3118 }
3119 #endif
3120 }
3121
3122 EV_FREQUENT_CHECK;
3123 }
3124
3125 void noinline
3126 ev_signal_stop (EV_P_ ev_signal *w)
3127 {
3128 clear_pending (EV_A_ (W)w);
3129 if (expect_false (!ev_is_active (w)))
3130 return;
3131
3132 EV_FREQUENT_CHECK;
3133
3134 wlist_del (&signals [w->signum - 1].head, (WL)w);
3135 ev_stop (EV_A_ (W)w);
3136
3137 if (!signals [w->signum - 1].head)
3138 {
3139 #if EV_MULTIPLICITY
3140 signals [w->signum - 1].loop = 0; /* unattach from signal */
3141 #endif
3142 #if EV_USE_SIGNALFD
3143 if (sigfd >= 0)
3144 {
3145 sigset_t ss;
3146
3147 sigemptyset (&ss);
3148 sigaddset (&ss, w->signum);
3149 sigdelset (&sigfd_set, w->signum);
3150
3151 signalfd (sigfd, &sigfd_set, 0);
3152 sigprocmask (SIG_UNBLOCK, &ss, 0);
3153 }
3154 else
3155 #endif
3156 signal (w->signum, SIG_DFL);
3157 }
3158
3159 EV_FREQUENT_CHECK;
3160 }
3161
3162 #endif
3163
3164 #if EV_CHILD_ENABLE
3165
3166 void
3167 ev_child_start (EV_P_ ev_child *w)
3168 {
3169 #if EV_MULTIPLICITY
3170 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3171 #endif
3172 if (expect_false (ev_is_active (w)))
3173 return;
3174
3175 EV_FREQUENT_CHECK;
3176
3177 ev_start (EV_A_ (W)w, 1);
3178 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3179
3180 EV_FREQUENT_CHECK;
3181 }
3182
3183 void
3184 ev_child_stop (EV_P_ ev_child *w)
3185 {
3186 clear_pending (EV_A_ (W)w);
3187 if (expect_false (!ev_is_active (w)))
3188 return;
3189
3190 EV_FREQUENT_CHECK;
3191
3192 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3193 ev_stop (EV_A_ (W)w);
3194
3195 EV_FREQUENT_CHECK;
3196 }
3197
3198 #endif
3199
3200 #if EV_STAT_ENABLE
3201
3202 # ifdef _WIN32
3203 # undef lstat
3204 # define lstat(a,b) _stati64 (a,b)
3205 # endif
3206
3207 #define DEF_STAT_INTERVAL 5.0074891
3208 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3209 #define MIN_STAT_INTERVAL 0.1074891
3210
3211 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3212
3213 #if EV_USE_INOTIFY
3214
3215 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3216 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3217
3218 static void noinline
3219 infy_add (EV_P_ ev_stat *w)
3220 {
3221 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);
3222
3223 if (w->wd >= 0)
3224 {
3225 struct statfs sfs;
3226
3227 /* now local changes will be tracked by inotify, but remote changes won't */
3228 /* unless the filesystem is known to be local, we therefore still poll */
3229 /* also do poll on <2.6.25, but with normal frequency */
3230
3231 if (!fs_2625)
3232 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3233 else if (!statfs (w->path, &sfs)
3234 && (sfs.f_type == 0x1373 /* devfs */
3235 || sfs.f_type == 0xEF53 /* ext2/3 */
3236 || sfs.f_type == 0x3153464a /* jfs */
3237 || sfs.f_type == 0x52654973 /* reiser3 */
3238 || sfs.f_type == 0x01021994 /* tempfs */
3239 || sfs.f_type == 0x58465342 /* xfs */))
3240 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3241 else
3242 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3243 }
3244 else
3245 {
3246 /* can't use inotify, continue to stat */
3247 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3248
3249 /* if path is not there, monitor some parent directory for speedup hints */
3250 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3251 /* but an efficiency issue only */
3252 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3253 {
3254 char path [4096];
3255 strcpy (path, w->path);
3256
3257 do
3258 {
3259 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3260 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3261
3262 char *pend = strrchr (path, '/');
3263
3264 if (!pend || pend == path)
3265 break;
3266
3267 *pend = 0;
3268 w->wd = inotify_add_watch (fs_fd, path, mask);
3269 }
3270 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3271 }
3272 }
3273
3274 if (w->wd >= 0)
3275 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3276
3277 /* now re-arm timer, if required */
3278 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3279 ev_timer_again (EV_A_ &w->timer);
3280 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3281 }
3282
3283 static void noinline
3284 infy_del (EV_P_ ev_stat *w)
3285 {
3286 int slot;
3287 int wd = w->wd;
3288
3289 if (wd < 0)
3290 return;
3291
3292 w->wd = -2;
3293 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3294 wlist_del (&fs_hash [slot].head, (WL)w);
3295
3296 /* remove this watcher, if others are watching it, they will rearm */
3297 inotify_rm_watch (fs_fd, wd);
3298 }
3299
3300 static void noinline
3301 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3302 {
3303 if (slot < 0)
3304 /* overflow, need to check for all hash slots */
3305 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3306 infy_wd (EV_A_ slot, wd, ev);
3307 else
3308 {
3309 WL w_;
3310
3311 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3312 {
3313 ev_stat *w = (ev_stat *)w_;
3314 w_ = w_->next; /* lets us remove this watcher and all before it */
3315
3316 if (w->wd == wd || wd == -1)
3317 {
3318 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3319 {
3320 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3321 w->wd = -1;
3322 infy_add (EV_A_ w); /* re-add, no matter what */
3323 }
3324
3325 stat_timer_cb (EV_A_ &w->timer, 0);
3326 }
3327 }
3328 }
3329 }
3330
3331 static void
3332 infy_cb (EV_P_ ev_io *w, int revents)
3333 {
3334 char buf [EV_INOTIFY_BUFSIZE];
3335 int ofs;
3336 int len = read (fs_fd, buf, sizeof (buf));
3337
3338 for (ofs = 0; ofs < len; )
3339 {
3340 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3341 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3342 ofs += sizeof (struct inotify_event) + ev->len;
3343 }
3344 }
3345
3346 inline_size void ecb_cold
3347 ev_check_2625 (EV_P)
3348 {
3349 /* kernels < 2.6.25 are borked
3350 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3351 */
3352 if (ev_linux_version () < 0x020619)
3353 return;
3354
3355 fs_2625 = 1;
3356 }
3357
3358 inline_size int
3359 infy_newfd (void)
3360 {
3361 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3362 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3363 if (fd >= 0)
3364 return fd;
3365 #endif
3366 return inotify_init ();
3367 }
3368
3369 inline_size void
3370 infy_init (EV_P)
3371 {
3372 if (fs_fd != -2)
3373 return;
3374
3375 fs_fd = -1;
3376
3377 ev_check_2625 (EV_A);
3378
3379 fs_fd = infy_newfd ();
3380
3381 if (fs_fd >= 0)
3382 {
3383 fd_intern (fs_fd);
3384 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3385 ev_set_priority (&fs_w, EV_MAXPRI);
3386 ev_io_start (EV_A_ &fs_w);
3387 ev_unref (EV_A);
3388 }
3389 }
3390
3391 inline_size void
3392 infy_fork (EV_P)
3393 {
3394 int slot;
3395
3396 if (fs_fd < 0)
3397 return;
3398
3399 ev_ref (EV_A);
3400 ev_io_stop (EV_A_ &fs_w);
3401 close (fs_fd);
3402 fs_fd = infy_newfd ();
3403
3404 if (fs_fd >= 0)
3405 {
3406 fd_intern (fs_fd);
3407 ev_io_set (&fs_w, fs_fd, EV_READ);
3408 ev_io_start (EV_A_ &fs_w);
3409 ev_unref (EV_A);
3410 }
3411
3412 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3413 {
3414 WL w_ = fs_hash [slot].head;
3415 fs_hash [slot].head = 0;
3416
3417 while (w_)
3418 {
3419 ev_stat *w = (ev_stat *)w_;
3420 w_ = w_->next; /* lets us add this watcher */
3421
3422 w->wd = -1;
3423
3424 if (fs_fd >= 0)
3425 infy_add (EV_A_ w); /* re-add, no matter what */
3426 else
3427 {
3428 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3429 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3430 ev_timer_again (EV_A_ &w->timer);
3431 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3432 }
3433 }
3434 }
3435 }
3436
3437 #endif
3438
3439 #ifdef _WIN32
3440 # define EV_LSTAT(p,b) _stati64 (p, b)
3441 #else
3442 # define EV_LSTAT(p,b) lstat (p, b)
3443 #endif
3444
3445 void
3446 ev_stat_stat (EV_P_ ev_stat *w)
3447 {
3448 if (lstat (w->path, &w->attr) < 0)
3449 w->attr.st_nlink = 0;
3450 else if (!w->attr.st_nlink)
3451 w->attr.st_nlink = 1;
3452 }
3453
3454 static void noinline
3455 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3456 {
3457 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3458
3459 ev_statdata prev = w->attr;
3460 ev_stat_stat (EV_A_ w);
3461
3462 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3463 if (
3464 prev.st_dev != w->attr.st_dev
3465 || prev.st_ino != w->attr.st_ino
3466 || prev.st_mode != w->attr.st_mode
3467 || prev.st_nlink != w->attr.st_nlink
3468 || prev.st_uid != w->attr.st_uid
3469 || prev.st_gid != w->attr.st_gid
3470 || prev.st_rdev != w->attr.st_rdev
3471 || prev.st_size != w->attr.st_size
3472 || prev.st_atime != w->attr.st_atime
3473 || prev.st_mtime != w->attr.st_mtime
3474 || prev.st_ctime != w->attr.st_ctime
3475 ) {
3476 /* we only update w->prev on actual differences */
3477 /* in case we test more often than invoke the callback, */
3478 /* to ensure that prev is always different to attr */
3479 w->prev = prev;
3480
3481 #if EV_USE_INOTIFY
3482 if (fs_fd >= 0)
3483 {
3484 infy_del (EV_A_ w);
3485 infy_add (EV_A_ w);
3486 ev_stat_stat (EV_A_ w); /* avoid race... */
3487 }
3488 #endif
3489
3490 ev_feed_event (EV_A_ w, EV_STAT);
3491 }
3492 }
3493
3494 void
3495 ev_stat_start (EV_P_ ev_stat *w)
3496 {
3497 if (expect_false (ev_is_active (w)))
3498 return;
3499
3500 ev_stat_stat (EV_A_ w);
3501
3502 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3503 w->interval = MIN_STAT_INTERVAL;
3504
3505 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3506 ev_set_priority (&w->timer, ev_priority (w));
3507
3508 #if EV_USE_INOTIFY
3509 infy_init (EV_A);
3510
3511 if (fs_fd >= 0)
3512 infy_add (EV_A_ w);
3513 else
3514 #endif
3515 {
3516 ev_timer_again (EV_A_ &w->timer);
3517 ev_unref (EV_A);
3518 }
3519
3520 ev_start (EV_A_ (W)w, 1);
3521
3522 EV_FREQUENT_CHECK;
3523 }
3524
3525 void
3526 ev_stat_stop (EV_P_ ev_stat *w)
3527 {
3528 clear_pending (EV_A_ (W)w);
3529 if (expect_false (!ev_is_active (w)))
3530 return;
3531
3532 EV_FREQUENT_CHECK;
3533
3534 #if EV_USE_INOTIFY
3535 infy_del (EV_A_ w);
3536 #endif
3537
3538 if (ev_is_active (&w->timer))
3539 {
3540 ev_ref (EV_A);
3541 ev_timer_stop (EV_A_ &w->timer);
3542 }
3543
3544 ev_stop (EV_A_ (W)w);
3545
3546 EV_FREQUENT_CHECK;
3547 }
3548 #endif
3549
3550 #if EV_IDLE_ENABLE
3551 void
3552 ev_idle_start (EV_P_ ev_idle *w)
3553 {
3554 if (expect_false (ev_is_active (w)))
3555 return;
3556
3557 pri_adjust (EV_A_ (W)w);
3558
3559 EV_FREQUENT_CHECK;
3560
3561 {
3562 int active = ++idlecnt [ABSPRI (w)];
3563
3564 ++idleall;
3565 ev_start (EV_A_ (W)w, active);
3566
3567 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3568 idles [ABSPRI (w)][active - 1] = w;
3569 }
3570
3571 EV_FREQUENT_CHECK;
3572 }
3573
3574 void
3575 ev_idle_stop (EV_P_ ev_idle *w)
3576 {
3577 clear_pending (EV_A_ (W)w);
3578 if (expect_false (!ev_is_active (w)))
3579 return;
3580
3581 EV_FREQUENT_CHECK;
3582
3583 {
3584 int active = ev_active (w);
3585
3586 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3587 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3588
3589 ev_stop (EV_A_ (W)w);
3590 --idleall;
3591 }
3592
3593 EV_FREQUENT_CHECK;
3594 }
3595 #endif
3596
3597 #if EV_PREPARE_ENABLE
3598 void
3599 ev_prepare_start (EV_P_ ev_prepare *w)
3600 {
3601 if (expect_false (ev_is_active (w)))
3602 return;
3603
3604 EV_FREQUENT_CHECK;
3605
3606 ev_start (EV_A_ (W)w, ++preparecnt);
3607 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3608 prepares [preparecnt - 1] = w;
3609
3610 EV_FREQUENT_CHECK;
3611 }
3612
3613 void
3614 ev_prepare_stop (EV_P_ ev_prepare *w)
3615 {
3616 clear_pending (EV_A_ (W)w);
3617 if (expect_false (!ev_is_active (w)))
3618 return;
3619
3620 EV_FREQUENT_CHECK;
3621
3622 {
3623 int active = ev_active (w);
3624
3625 prepares [active - 1] = prepares [--preparecnt];
3626 ev_active (prepares [active - 1]) = active;
3627 }
3628
3629 ev_stop (EV_A_ (W)w);
3630
3631 EV_FREQUENT_CHECK;
3632 }
3633 #endif
3634
3635 #if EV_CHECK_ENABLE
3636 void
3637 ev_check_start (EV_P_ ev_check *w)
3638 {
3639 if (expect_false (ev_is_active (w)))
3640 return;
3641
3642 EV_FREQUENT_CHECK;
3643
3644 ev_start (EV_A_ (W)w, ++checkcnt);
3645 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3646 checks [checkcnt - 1] = w;
3647
3648 EV_FREQUENT_CHECK;
3649 }
3650
3651 void
3652 ev_check_stop (EV_P_ ev_check *w)
3653 {
3654 clear_pending (EV_A_ (W)w);
3655 if (expect_false (!ev_is_active (w)))
3656 return;
3657
3658 EV_FREQUENT_CHECK;
3659
3660 {
3661 int active = ev_active (w);
3662
3663 checks [active - 1] = checks [--checkcnt];
3664 ev_active (checks [active - 1]) = active;
3665 }
3666
3667 ev_stop (EV_A_ (W)w);
3668
3669 EV_FREQUENT_CHECK;
3670 }
3671 #endif
3672
3673 #if EV_EMBED_ENABLE
3674 void noinline
3675 ev_embed_sweep (EV_P_ ev_embed *w)
3676 {
3677 ev_run (w->other, EVRUN_NOWAIT);
3678 }
3679
3680 static void
3681 embed_io_cb (EV_P_ ev_io *io, int revents)
3682 {
3683 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3684
3685 if (ev_cb (w))
3686 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3687 else
3688 ev_run (w->other, EVRUN_NOWAIT);
3689 }
3690
3691 static void
3692 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3693 {
3694 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3695
3696 {
3697 EV_P = w->other;
3698
3699 while (fdchangecnt)
3700 {
3701 fd_reify (EV_A);
3702 ev_run (EV_A_ EVRUN_NOWAIT);
3703 }
3704 }
3705 }
3706
3707 static void
3708 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3709 {
3710 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3711
3712 ev_embed_stop (EV_A_ w);
3713
3714 {
3715 EV_P = w->other;
3716
3717 ev_loop_fork (EV_A);
3718 ev_run (EV_A_ EVRUN_NOWAIT);
3719 }
3720
3721 ev_embed_start (EV_A_ w);
3722 }
3723
3724 #if 0
3725 static void
3726 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3727 {
3728 ev_idle_stop (EV_A_ idle);
3729 }
3730 #endif
3731
3732 void
3733 ev_embed_start (EV_P_ ev_embed *w)
3734 {
3735 if (expect_false (ev_is_active (w)))
3736 return;
3737
3738 {
3739 EV_P = w->other;
3740 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3741 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3742 }
3743
3744 EV_FREQUENT_CHECK;
3745
3746 ev_set_priority (&w->io, ev_priority (w));
3747 ev_io_start (EV_A_ &w->io);
3748
3749 ev_prepare_init (&w->prepare, embed_prepare_cb);
3750 ev_set_priority (&w->prepare, EV_MINPRI);
3751 ev_prepare_start (EV_A_ &w->prepare);
3752
3753 ev_fork_init (&w->fork, embed_fork_cb);
3754 ev_fork_start (EV_A_ &w->fork);
3755
3756 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3757
3758 ev_start (EV_A_ (W)w, 1);
3759
3760 EV_FREQUENT_CHECK;
3761 }
3762
3763 void
3764 ev_embed_stop (EV_P_ ev_embed *w)
3765 {
3766 clear_pending (EV_A_ (W)w);
3767 if (expect_false (!ev_is_active (w)))
3768 return;
3769
3770 EV_FREQUENT_CHECK;
3771
3772 ev_io_stop (EV_A_ &w->io);
3773 ev_prepare_stop (EV_A_ &w->prepare);
3774 ev_fork_stop (EV_A_ &w->fork);
3775
3776 ev_stop (EV_A_ (W)w);
3777
3778 EV_FREQUENT_CHECK;
3779 }
3780 #endif
3781
3782 #if EV_FORK_ENABLE
3783 void
3784 ev_fork_start (EV_P_ ev_fork *w)
3785 {
3786 if (expect_false (ev_is_active (w)))
3787 return;
3788
3789 EV_FREQUENT_CHECK;
3790
3791 ev_start (EV_A_ (W)w, ++forkcnt);
3792 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3793 forks [forkcnt - 1] = w;
3794
3795 EV_FREQUENT_CHECK;
3796 }
3797
3798 void
3799 ev_fork_stop (EV_P_ ev_fork *w)
3800 {
3801 clear_pending (EV_A_ (W)w);
3802 if (expect_false (!ev_is_active (w)))
3803 return;
3804
3805 EV_FREQUENT_CHECK;
3806
3807 {
3808 int active = ev_active (w);
3809
3810 forks [active - 1] = forks [--forkcnt];
3811 ev_active (forks [active - 1]) = active;
3812 }
3813
3814 ev_stop (EV_A_ (W)w);
3815
3816 EV_FREQUENT_CHECK;
3817 }
3818 #endif
3819
3820 #if EV_CLEANUP_ENABLE
3821 void
3822 ev_cleanup_start (EV_P_ ev_cleanup *w)
3823 {
3824 if (expect_false (ev_is_active (w)))
3825 return;
3826
3827 EV_FREQUENT_CHECK;
3828
3829 ev_start (EV_A_ (W)w, ++cleanupcnt);
3830 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3831 cleanups [cleanupcnt - 1] = w;
3832
3833 /* cleanup watchers should never keep a refcount on the loop */
3834 ev_unref (EV_A);
3835 EV_FREQUENT_CHECK;
3836 }
3837
3838 void
3839 ev_cleanup_stop (EV_P_ ev_cleanup *w)
3840 {
3841 clear_pending (EV_A_ (W)w);
3842 if (expect_false (!ev_is_active (w)))
3843 return;
3844
3845 EV_FREQUENT_CHECK;
3846 ev_ref (EV_A);
3847
3848 {
3849 int active = ev_active (w);
3850
3851 cleanups [active - 1] = cleanups [--cleanupcnt];
3852 ev_active (cleanups [active - 1]) = active;
3853 }
3854
3855 ev_stop (EV_A_ (W)w);
3856
3857 EV_FREQUENT_CHECK;
3858 }
3859 #endif
3860
3861 #if EV_ASYNC_ENABLE
3862 void
3863 ev_async_start (EV_P_ ev_async *w)
3864 {
3865 if (expect_false (ev_is_active (w)))
3866 return;
3867
3868 w->sent = 0;
3869
3870 evpipe_init (EV_A);
3871
3872 EV_FREQUENT_CHECK;
3873
3874 ev_start (EV_A_ (W)w, ++asynccnt);
3875 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3876 asyncs [asynccnt - 1] = w;
3877
3878 EV_FREQUENT_CHECK;
3879 }
3880
3881 void
3882 ev_async_stop (EV_P_ ev_async *w)
3883 {
3884 clear_pending (EV_A_ (W)w);
3885 if (expect_false (!ev_is_active (w)))
3886 return;
3887
3888 EV_FREQUENT_CHECK;
3889
3890 {
3891 int active = ev_active (w);
3892
3893 asyncs [active - 1] = asyncs [--asynccnt];
3894 ev_active (asyncs [active - 1]) = active;
3895 }
3896
3897 ev_stop (EV_A_ (W)w);
3898
3899 EV_FREQUENT_CHECK;
3900 }
3901
3902 void
3903 ev_async_send (EV_P_ ev_async *w)
3904 {
3905 w->sent = 1;
3906 evpipe_write (EV_A_ &async_pending);
3907 }
3908 #endif
3909
3910 /*****************************************************************************/
3911
3912 struct ev_once
3913 {
3914 ev_io io;
3915 ev_timer to;
3916 void (*cb)(int revents, void *arg);
3917 void *arg;
3918 };
3919
3920 static void
3921 once_cb (EV_P_ struct ev_once *once, int revents)
3922 {
3923 void (*cb)(int revents, void *arg) = once->cb;
3924 void *arg = once->arg;
3925
3926 ev_io_stop (EV_A_ &once->io);
3927 ev_timer_stop (EV_A_ &once->to);
3928 ev_free (once);
3929
3930 cb (revents, arg);
3931 }
3932
3933 static void
3934 once_cb_io (EV_P_ ev_io *w, int revents)
3935 {
3936 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3937
3938 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3939 }
3940
3941 static void
3942 once_cb_to (EV_P_ ev_timer *w, int revents)
3943 {
3944 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3945
3946 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3947 }
3948
3949 void
3950 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3951 {
3952 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3953
3954 if (expect_false (!once))
3955 {
3956 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3957 return;
3958 }
3959
3960 once->cb = cb;
3961 once->arg = arg;
3962
3963 ev_init (&once->io, once_cb_io);
3964 if (fd >= 0)
3965 {
3966 ev_io_set (&once->io, fd, events);
3967 ev_io_start (EV_A_ &once->io);
3968 }
3969
3970 ev_init (&once->to, once_cb_to);
3971 if (timeout >= 0.)
3972 {
3973 ev_timer_set (&once->to, timeout, 0.);
3974 ev_timer_start (EV_A_ &once->to);
3975 }
3976 }
3977
3978 /*****************************************************************************/
3979
3980 #if EV_WALK_ENABLE
3981 void ecb_cold
3982 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3983 {
3984 int i, j;
3985 ev_watcher_list *wl, *wn;
3986
3987 if (types & (EV_IO | EV_EMBED))
3988 for (i = 0; i < anfdmax; ++i)
3989 for (wl = anfds [i].head; wl; )
3990 {
3991 wn = wl->next;
3992
3993 #if EV_EMBED_ENABLE
3994 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3995 {
3996 if (types & EV_EMBED)
3997 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3998 }
3999 else
4000 #endif
4001 #if EV_USE_INOTIFY
4002 if (ev_cb ((ev_io *)wl) == infy_cb)
4003 ;
4004 else
4005 #endif
4006 if ((ev_io *)wl != &pipe_w)
4007 if (types & EV_IO)
4008 cb (EV_A_ EV_IO, wl);
4009
4010 wl = wn;
4011 }
4012
4013 if (types & (EV_TIMER | EV_STAT))
4014 for (i = timercnt + HEAP0; i-- > HEAP0; )
4015 #if EV_STAT_ENABLE
4016 /*TODO: timer is not always active*/
4017 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
4018 {
4019 if (types & EV_STAT)
4020 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
4021 }
4022 else
4023 #endif
4024 if (types & EV_TIMER)
4025 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
4026
4027 #if EV_PERIODIC_ENABLE
4028 if (types & EV_PERIODIC)
4029 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4030 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4031 #endif
4032
4033 #if EV_IDLE_ENABLE
4034 if (types & EV_IDLE)
4035 for (j = NUMPRI; j--; )
4036 for (i = idlecnt [j]; i--; )
4037 cb (EV_A_ EV_IDLE, idles [j][i]);
4038 #endif
4039
4040 #if EV_FORK_ENABLE
4041 if (types & EV_FORK)
4042 for (i = forkcnt; i--; )
4043 if (ev_cb (forks [i]) != embed_fork_cb)
4044 cb (EV_A_ EV_FORK, forks [i]);
4045 #endif
4046
4047 #if EV_ASYNC_ENABLE
4048 if (types & EV_ASYNC)
4049 for (i = asynccnt; i--; )
4050 cb (EV_A_ EV_ASYNC, asyncs [i]);
4051 #endif
4052
4053 #if EV_PREPARE_ENABLE
4054 if (types & EV_PREPARE)
4055 for (i = preparecnt; i--; )
4056 # if EV_EMBED_ENABLE
4057 if (ev_cb (prepares [i]) != embed_prepare_cb)
4058 # endif
4059 cb (EV_A_ EV_PREPARE, prepares [i]);
4060 #endif
4061
4062 #if EV_CHECK_ENABLE
4063 if (types & EV_CHECK)
4064 for (i = checkcnt; i--; )
4065 cb (EV_A_ EV_CHECK, checks [i]);
4066 #endif
4067
4068 #if EV_SIGNAL_ENABLE
4069 if (types & EV_SIGNAL)
4070 for (i = 0; i < EV_NSIG - 1; ++i)
4071 for (wl = signals [i].head; wl; )
4072 {
4073 wn = wl->next;
4074 cb (EV_A_ EV_SIGNAL, wl);
4075 wl = wn;
4076 }
4077 #endif
4078
4079 #if EV_CHILD_ENABLE
4080 if (types & EV_CHILD)
4081 for (i = (EV_PID_HASHSIZE); i--; )
4082 for (wl = childs [i]; wl; )
4083 {
4084 wn = wl->next;
4085 cb (EV_A_ EV_CHILD, wl);
4086 wl = wn;
4087 }
4088 #endif
4089 /* EV_STAT 0x00001000 /* stat data changed */
4090 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4091 }
4092 #endif
4093
4094 #if EV_MULTIPLICITY
4095 #include "ev_wrap.h"
4096 #endif
4097
4098 EV_CPP(})
4099