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/cvs/libev/ev.c
Revision: 1.383
Committed: Wed Jul 20 00:40:14 2011 UTC (13 years ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.382: +70 -25 lines
Log Message:
temporary fence hack

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