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Revision: 1.379
Committed: Sun Jun 19 17:55:13 2011 UTC (13 years, 1 month ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.378: +100 -44 lines
Log Message:
ecb.h, ecb_cold

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