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Revision: 1.447
Committed: Tue Jun 19 12:29:43 2012 UTC (12 years, 1 month ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.446: +2 -4 lines
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File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 /* this big block deduces configuration from config.h */
41 #ifndef EV_STANDALONE
42 # ifdef EV_CONFIG_H
43 # include EV_CONFIG_H
44 # else
45 # include "config.h"
46 # endif
47
48 #if HAVE_FLOOR
49 # ifndef EV_USE_FLOOR
50 # define EV_USE_FLOOR 1
51 # endif
52 #endif
53
54 # if HAVE_CLOCK_SYSCALL
55 # ifndef EV_USE_CLOCK_SYSCALL
56 # define EV_USE_CLOCK_SYSCALL 1
57 # ifndef EV_USE_REALTIME
58 # define EV_USE_REALTIME 0
59 # endif
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 1
62 # endif
63 # endif
64 # elif !defined EV_USE_CLOCK_SYSCALL
65 # define EV_USE_CLOCK_SYSCALL 0
66 # endif
67
68 # if HAVE_CLOCK_GETTIME
69 # ifndef EV_USE_MONOTONIC
70 # define EV_USE_MONOTONIC 1
71 # endif
72 # ifndef EV_USE_REALTIME
73 # define EV_USE_REALTIME 0
74 # endif
75 # else
76 # ifndef EV_USE_MONOTONIC
77 # define EV_USE_MONOTONIC 0
78 # endif
79 # ifndef EV_USE_REALTIME
80 # define EV_USE_REALTIME 0
81 # endif
82 # endif
83
84 # if HAVE_NANOSLEEP
85 # ifndef EV_USE_NANOSLEEP
86 # define EV_USE_NANOSLEEP EV_FEATURE_OS
87 # endif
88 # else
89 # undef EV_USE_NANOSLEEP
90 # define EV_USE_NANOSLEEP 0
91 # endif
92
93 # if HAVE_SELECT && HAVE_SYS_SELECT_H
94 # ifndef EV_USE_SELECT
95 # define EV_USE_SELECT EV_FEATURE_BACKENDS
96 # endif
97 # else
98 # undef EV_USE_SELECT
99 # define EV_USE_SELECT 0
100 # endif
101
102 # if HAVE_POLL && HAVE_POLL_H
103 # ifndef EV_USE_POLL
104 # define EV_USE_POLL EV_FEATURE_BACKENDS
105 # endif
106 # else
107 # undef EV_USE_POLL
108 # define EV_USE_POLL 0
109 # endif
110
111 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
112 # ifndef EV_USE_EPOLL
113 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
114 # endif
115 # else
116 # undef EV_USE_EPOLL
117 # define EV_USE_EPOLL 0
118 # endif
119
120 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
121 # ifndef EV_USE_KQUEUE
122 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
123 # endif
124 # else
125 # undef EV_USE_KQUEUE
126 # define EV_USE_KQUEUE 0
127 # endif
128
129 # if HAVE_PORT_H && HAVE_PORT_CREATE
130 # ifndef EV_USE_PORT
131 # define EV_USE_PORT EV_FEATURE_BACKENDS
132 # endif
133 # else
134 # undef EV_USE_PORT
135 # define EV_USE_PORT 0
136 # endif
137
138 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
139 # ifndef EV_USE_INOTIFY
140 # define EV_USE_INOTIFY EV_FEATURE_OS
141 # endif
142 # else
143 # undef EV_USE_INOTIFY
144 # define EV_USE_INOTIFY 0
145 # endif
146
147 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
148 # ifndef EV_USE_SIGNALFD
149 # define EV_USE_SIGNALFD EV_FEATURE_OS
150 # endif
151 # else
152 # undef EV_USE_SIGNALFD
153 # define EV_USE_SIGNALFD 0
154 # endif
155
156 # if HAVE_EVENTFD
157 # ifndef EV_USE_EVENTFD
158 # define EV_USE_EVENTFD EV_FEATURE_OS
159 # endif
160 # else
161 # undef EV_USE_EVENTFD
162 # define EV_USE_EVENTFD 0
163 # endif
164
165 #endif
166
167 #include <stdlib.h>
168 #include <string.h>
169 #include <fcntl.h>
170 #include <stddef.h>
171
172 #include <stdio.h>
173
174 #include <assert.h>
175 #include <errno.h>
176 #include <sys/types.h>
177 #include <time.h>
178 #include <limits.h>
179
180 #include <signal.h>
181
182 #ifdef EV_H
183 # include EV_H
184 #else
185 # include "ev.h"
186 #endif
187
188 #if EV_NO_THREADS
189 # undef EV_NO_SMP
190 # define EV_NO_SMP 1
191 # undef ECB_NO_THREADS
192 # define ECB_NO_THREADS 1
193 #endif
194 #if EV_NO_SMP
195 # undef EV_NO_SMP
196 # define ECB_NO_SMP 1
197 #endif
198
199 #ifndef _WIN32
200 # include <sys/time.h>
201 # include <sys/wait.h>
202 # include <unistd.h>
203 #else
204 # include <io.h>
205 # define WIN32_LEAN_AND_MEAN
206 # include <winsock2.h>
207 # include <windows.h>
208 # ifndef EV_SELECT_IS_WINSOCKET
209 # define EV_SELECT_IS_WINSOCKET 1
210 # endif
211 # undef EV_AVOID_STDIO
212 #endif
213
214 /* OS X, in its infinite idiocy, actually HARDCODES
215 * a limit of 1024 into their select. Where people have brains,
216 * OS X engineers apparently have a vacuum. Or maybe they were
217 * ordered to have a vacuum, or they do anything for money.
218 * This might help. Or not.
219 */
220 #define _DARWIN_UNLIMITED_SELECT 1
221
222 /* this block tries to deduce configuration from header-defined symbols and defaults */
223
224 /* try to deduce the maximum number of signals on this platform */
225 #if defined EV_NSIG
226 /* use what's provided */
227 #elif defined NSIG
228 # define EV_NSIG (NSIG)
229 #elif defined _NSIG
230 # define EV_NSIG (_NSIG)
231 #elif defined SIGMAX
232 # define EV_NSIG (SIGMAX+1)
233 #elif defined SIG_MAX
234 # define EV_NSIG (SIG_MAX+1)
235 #elif defined _SIG_MAX
236 # define EV_NSIG (_SIG_MAX+1)
237 #elif defined MAXSIG
238 # define EV_NSIG (MAXSIG+1)
239 #elif defined MAX_SIG
240 # define EV_NSIG (MAX_SIG+1)
241 #elif defined SIGARRAYSIZE
242 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
243 #elif defined _sys_nsig
244 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
245 #else
246 # error "unable to find value for NSIG, please report"
247 /* to make it compile regardless, just remove the above line, */
248 /* but consider reporting it, too! :) */
249 # define EV_NSIG 65
250 #endif
251
252 #ifndef EV_USE_FLOOR
253 # define EV_USE_FLOOR 0
254 #endif
255
256 #ifndef EV_USE_CLOCK_SYSCALL
257 # if __linux && __GLIBC__ >= 2
258 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
259 # else
260 # define EV_USE_CLOCK_SYSCALL 0
261 # endif
262 #endif
263
264 #ifndef EV_USE_MONOTONIC
265 # if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
266 # define EV_USE_MONOTONIC EV_FEATURE_OS
267 # else
268 # define EV_USE_MONOTONIC 0
269 # endif
270 #endif
271
272 #ifndef EV_USE_REALTIME
273 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
274 #endif
275
276 #ifndef EV_USE_NANOSLEEP
277 # if _POSIX_C_SOURCE >= 199309L
278 # define EV_USE_NANOSLEEP EV_FEATURE_OS
279 # else
280 # define EV_USE_NANOSLEEP 0
281 # endif
282 #endif
283
284 #ifndef EV_USE_SELECT
285 # define EV_USE_SELECT EV_FEATURE_BACKENDS
286 #endif
287
288 #ifndef EV_USE_POLL
289 # ifdef _WIN32
290 # define EV_USE_POLL 0
291 # else
292 # define EV_USE_POLL EV_FEATURE_BACKENDS
293 # endif
294 #endif
295
296 #ifndef EV_USE_EPOLL
297 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
298 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
299 # else
300 # define EV_USE_EPOLL 0
301 # endif
302 #endif
303
304 #ifndef EV_USE_KQUEUE
305 # define EV_USE_KQUEUE 0
306 #endif
307
308 #ifndef EV_USE_PORT
309 # define EV_USE_PORT 0
310 #endif
311
312 #ifndef EV_USE_INOTIFY
313 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
314 # define EV_USE_INOTIFY EV_FEATURE_OS
315 # else
316 # define EV_USE_INOTIFY 0
317 # endif
318 #endif
319
320 #ifndef EV_PID_HASHSIZE
321 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
322 #endif
323
324 #ifndef EV_INOTIFY_HASHSIZE
325 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
326 #endif
327
328 #ifndef EV_USE_EVENTFD
329 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
330 # define EV_USE_EVENTFD EV_FEATURE_OS
331 # else
332 # define EV_USE_EVENTFD 0
333 # endif
334 #endif
335
336 #ifndef EV_USE_SIGNALFD
337 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
338 # define EV_USE_SIGNALFD EV_FEATURE_OS
339 # else
340 # define EV_USE_SIGNALFD 0
341 # endif
342 #endif
343
344 #if 0 /* debugging */
345 # define EV_VERIFY 3
346 # define EV_USE_4HEAP 1
347 # define EV_HEAP_CACHE_AT 1
348 #endif
349
350 #ifndef EV_VERIFY
351 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
352 #endif
353
354 #ifndef EV_USE_4HEAP
355 # define EV_USE_4HEAP EV_FEATURE_DATA
356 #endif
357
358 #ifndef EV_HEAP_CACHE_AT
359 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
360 #endif
361
362 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
363 /* which makes programs even slower. might work on other unices, too. */
364 #if EV_USE_CLOCK_SYSCALL
365 # include <sys/syscall.h>
366 # ifdef SYS_clock_gettime
367 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
368 # undef EV_USE_MONOTONIC
369 # define EV_USE_MONOTONIC 1
370 # else
371 # undef EV_USE_CLOCK_SYSCALL
372 # define EV_USE_CLOCK_SYSCALL 0
373 # endif
374 #endif
375
376 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
377
378 #ifdef _AIX
379 /* AIX has a completely broken poll.h header */
380 # undef EV_USE_POLL
381 # define EV_USE_POLL 0
382 #endif
383
384 #ifndef CLOCK_MONOTONIC
385 # undef EV_USE_MONOTONIC
386 # define EV_USE_MONOTONIC 0
387 #endif
388
389 #ifndef CLOCK_REALTIME
390 # undef EV_USE_REALTIME
391 # define EV_USE_REALTIME 0
392 #endif
393
394 #if !EV_STAT_ENABLE
395 # undef EV_USE_INOTIFY
396 # define EV_USE_INOTIFY 0
397 #endif
398
399 #if !EV_USE_NANOSLEEP
400 /* hp-ux has it in sys/time.h, which we unconditionally include above */
401 # if !defined _WIN32 && !defined __hpux
402 # include <sys/select.h>
403 # endif
404 #endif
405
406 #if EV_USE_INOTIFY
407 # include <sys/statfs.h>
408 # include <sys/inotify.h>
409 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
410 # ifndef IN_DONT_FOLLOW
411 # undef EV_USE_INOTIFY
412 # define EV_USE_INOTIFY 0
413 # endif
414 #endif
415
416 #if EV_USE_EVENTFD
417 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
418 # include <stdint.h>
419 # ifndef EFD_NONBLOCK
420 # define EFD_NONBLOCK O_NONBLOCK
421 # endif
422 # ifndef EFD_CLOEXEC
423 # ifdef O_CLOEXEC
424 # define EFD_CLOEXEC O_CLOEXEC
425 # else
426 # define EFD_CLOEXEC 02000000
427 # endif
428 # endif
429 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
430 #endif
431
432 #if EV_USE_SIGNALFD
433 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
434 # include <stdint.h>
435 # ifndef SFD_NONBLOCK
436 # define SFD_NONBLOCK O_NONBLOCK
437 # endif
438 # ifndef SFD_CLOEXEC
439 # ifdef O_CLOEXEC
440 # define SFD_CLOEXEC O_CLOEXEC
441 # else
442 # define SFD_CLOEXEC 02000000
443 # endif
444 # endif
445 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
446
447 struct signalfd_siginfo
448 {
449 uint32_t ssi_signo;
450 char pad[128 - sizeof (uint32_t)];
451 };
452 #endif
453
454 /**/
455
456 #if EV_VERIFY >= 3
457 # define EV_FREQUENT_CHECK ev_verify (EV_A)
458 #else
459 # define EV_FREQUENT_CHECK do { } while (0)
460 #endif
461
462 /*
463 * This is used to work around floating point rounding problems.
464 * This value is good at least till the year 4000.
465 */
466 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
467 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
468
469 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
470 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
471
472 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
473 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
474
475 /* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
476 /* ECB.H BEGIN */
477 /*
478 * libecb - http://software.schmorp.de/pkg/libecb
479 *
480 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
481 * Copyright (©) 2011 Emanuele Giaquinta
482 * All rights reserved.
483 *
484 * Redistribution and use in source and binary forms, with or without modifica-
485 * tion, are permitted provided that the following conditions are met:
486 *
487 * 1. Redistributions of source code must retain the above copyright notice,
488 * this list of conditions and the following disclaimer.
489 *
490 * 2. Redistributions in binary form must reproduce the above copyright
491 * notice, this list of conditions and the following disclaimer in the
492 * documentation and/or other materials provided with the distribution.
493 *
494 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
495 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
496 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
497 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
498 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
499 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
500 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
501 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
502 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
503 * OF THE POSSIBILITY OF SUCH DAMAGE.
504 */
505
506 #ifndef ECB_H
507 #define ECB_H
508
509 /* 16 bits major, 16 bits minor */
510 #define ECB_VERSION 0x00010001
511
512 #ifdef _WIN32
513 typedef signed char int8_t;
514 typedef unsigned char uint8_t;
515 typedef signed short int16_t;
516 typedef unsigned short uint16_t;
517 typedef signed int int32_t;
518 typedef unsigned int uint32_t;
519 #if __GNUC__
520 typedef signed long long int64_t;
521 typedef unsigned long long uint64_t;
522 #else /* _MSC_VER || __BORLANDC__ */
523 typedef signed __int64 int64_t;
524 typedef unsigned __int64 uint64_t;
525 #endif
526 #ifdef _WIN64
527 #define ECB_PTRSIZE 8
528 typedef uint64_t uintptr_t;
529 typedef int64_t intptr_t;
530 #else
531 #define ECB_PTRSIZE 4
532 typedef uint32_t uintptr_t;
533 typedef int32_t intptr_t;
534 #endif
535 typedef intptr_t ptrdiff_t;
536 #else
537 #include <inttypes.h>
538 #if UINTMAX_MAX > 0xffffffffU
539 #define ECB_PTRSIZE 8
540 #else
541 #define ECB_PTRSIZE 4
542 #endif
543 #endif
544
545 /* many compilers define _GNUC_ to some versions but then only implement
546 * what their idiot authors think are the "more important" extensions,
547 * causing enormous grief in return for some better fake benchmark numbers.
548 * or so.
549 * we try to detect these and simply assume they are not gcc - if they have
550 * an issue with that they should have done it right in the first place.
551 */
552 #ifndef ECB_GCC_VERSION
553 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
554 #define ECB_GCC_VERSION(major,minor) 0
555 #else
556 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
557 #endif
558 #endif
559
560 #define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
561 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
562 #define ECB_C11 (__STDC_VERSION__ >= 201112L)
563 #define ECB_CPP (__cplusplus+0)
564 #define ECB_CPP11 (__cplusplus >= 201103L)
565
566 /*****************************************************************************/
567
568 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
569 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
570
571 #if ECB_NO_THREADS
572 #define ECB_NO_SMP 1
573 #endif
574
575 #if ECB_NO_SMP
576 #define ECB_MEMORY_FENCE do { } while (0)
577 #endif
578
579 #ifndef ECB_MEMORY_FENCE
580 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
581 #if __i386 || __i386__
582 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
583 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
584 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
585 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
586 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
587 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
588 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
589 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
590 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
591 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
592 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
593 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
594 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
595 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
596 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
597 #elif __sparc || __sparc__
598 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
599 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
600 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
601 #elif defined __s390__ || defined __s390x__
602 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
603 #elif defined __mips__
604 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
605 #elif defined __alpha__
606 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
607 #elif defined __hppa__
608 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
609 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
610 #elif defined __ia64__
611 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
612 #endif
613 #endif
614 #endif
615
616 #ifndef ECB_MEMORY_FENCE
617 #if ECB_GCC_VERSION(4,7)
618 /* see comment below (stdatomic.h) about the C11 memory model. */
619 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
620 #elif defined __clang && __has_feature (cxx_atomic)
621 /* see comment below (stdatomic.h) about the C11 memory model. */
622 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
623 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
624 #define ECB_MEMORY_FENCE __sync_synchronize ()
625 #elif _MSC_VER >= 1400 /* VC++ 2005 */
626 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
627 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
628 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
629 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
630 #elif defined _WIN32
631 #include <WinNT.h>
632 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
633 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
634 #include <mbarrier.h>
635 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
636 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
637 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
638 #elif __xlC__
639 #define ECB_MEMORY_FENCE __sync ()
640 #endif
641 #endif
642
643 #ifndef ECB_MEMORY_FENCE
644 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
645 /* we assume that these memory fences work on all variables/all memory accesses, */
646 /* not just C11 atomics and atomic accesses */
647 #include <stdatomic.h>
648 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
649 /* any fence other than seq_cst, which isn't very efficient for us. */
650 /* Why that is, we don't know - either the C11 memory model is quite useless */
651 /* for most usages, or gcc and clang have a bug */
652 /* I *currently* lean towards the latter, and inefficiently implement */
653 /* all three of ecb's fences as a seq_cst fence */
654 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
655 #endif
656 #endif
657
658 #ifndef ECB_MEMORY_FENCE
659 #if !ECB_AVOID_PTHREADS
660 /*
661 * if you get undefined symbol references to pthread_mutex_lock,
662 * or failure to find pthread.h, then you should implement
663 * the ECB_MEMORY_FENCE operations for your cpu/compiler
664 * OR provide pthread.h and link against the posix thread library
665 * of your system.
666 */
667 #include <pthread.h>
668 #define ECB_NEEDS_PTHREADS 1
669 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
670
671 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
672 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
673 #endif
674 #endif
675
676 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
677 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
678 #endif
679
680 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
681 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
682 #endif
683
684 /*****************************************************************************/
685
686 #if __cplusplus
687 #define ecb_inline static inline
688 #elif ECB_GCC_VERSION(2,5)
689 #define ecb_inline static __inline__
690 #elif ECB_C99
691 #define ecb_inline static inline
692 #else
693 #define ecb_inline static
694 #endif
695
696 #if ECB_GCC_VERSION(3,3)
697 #define ecb_restrict __restrict__
698 #elif ECB_C99
699 #define ecb_restrict restrict
700 #else
701 #define ecb_restrict
702 #endif
703
704 typedef int ecb_bool;
705
706 #define ECB_CONCAT_(a, b) a ## b
707 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
708 #define ECB_STRINGIFY_(a) # a
709 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
710
711 #define ecb_function_ ecb_inline
712
713 #if ECB_GCC_VERSION(3,1)
714 #define ecb_attribute(attrlist) __attribute__(attrlist)
715 #define ecb_is_constant(expr) __builtin_constant_p (expr)
716 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
717 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
718 #else
719 #define ecb_attribute(attrlist)
720 #define ecb_is_constant(expr) 0
721 #define ecb_expect(expr,value) (expr)
722 #define ecb_prefetch(addr,rw,locality)
723 #endif
724
725 /* no emulation for ecb_decltype */
726 #if ECB_GCC_VERSION(4,5)
727 #define ecb_decltype(x) __decltype(x)
728 #elif ECB_GCC_VERSION(3,0)
729 #define ecb_decltype(x) __typeof(x)
730 #endif
731
732 #define ecb_noinline ecb_attribute ((__noinline__))
733 #define ecb_unused ecb_attribute ((__unused__))
734 #define ecb_const ecb_attribute ((__const__))
735 #define ecb_pure ecb_attribute ((__pure__))
736
737 #if ECB_C11
738 #define ecb_noreturn _Noreturn
739 #else
740 #define ecb_noreturn ecb_attribute ((__noreturn__))
741 #endif
742
743 #if ECB_GCC_VERSION(4,3)
744 #define ecb_artificial ecb_attribute ((__artificial__))
745 #define ecb_hot ecb_attribute ((__hot__))
746 #define ecb_cold ecb_attribute ((__cold__))
747 #else
748 #define ecb_artificial
749 #define ecb_hot
750 #define ecb_cold
751 #endif
752
753 /* put around conditional expressions if you are very sure that the */
754 /* expression is mostly true or mostly false. note that these return */
755 /* booleans, not the expression. */
756 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
757 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
758 /* for compatibility to the rest of the world */
759 #define ecb_likely(expr) ecb_expect_true (expr)
760 #define ecb_unlikely(expr) ecb_expect_false (expr)
761
762 /* count trailing zero bits and count # of one bits */
763 #if ECB_GCC_VERSION(3,4)
764 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
765 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
766 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
767 #define ecb_ctz32(x) __builtin_ctz (x)
768 #define ecb_ctz64(x) __builtin_ctzll (x)
769 #define ecb_popcount32(x) __builtin_popcount (x)
770 /* no popcountll */
771 #else
772 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
773 ecb_function_ int
774 ecb_ctz32 (uint32_t x)
775 {
776 int r = 0;
777
778 x &= ~x + 1; /* this isolates the lowest bit */
779
780 #if ECB_branchless_on_i386
781 r += !!(x & 0xaaaaaaaa) << 0;
782 r += !!(x & 0xcccccccc) << 1;
783 r += !!(x & 0xf0f0f0f0) << 2;
784 r += !!(x & 0xff00ff00) << 3;
785 r += !!(x & 0xffff0000) << 4;
786 #else
787 if (x & 0xaaaaaaaa) r += 1;
788 if (x & 0xcccccccc) r += 2;
789 if (x & 0xf0f0f0f0) r += 4;
790 if (x & 0xff00ff00) r += 8;
791 if (x & 0xffff0000) r += 16;
792 #endif
793
794 return r;
795 }
796
797 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
798 ecb_function_ int
799 ecb_ctz64 (uint64_t x)
800 {
801 int shift = x & 0xffffffffU ? 0 : 32;
802 return ecb_ctz32 (x >> shift) + shift;
803 }
804
805 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
806 ecb_function_ int
807 ecb_popcount32 (uint32_t x)
808 {
809 x -= (x >> 1) & 0x55555555;
810 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
811 x = ((x >> 4) + x) & 0x0f0f0f0f;
812 x *= 0x01010101;
813
814 return x >> 24;
815 }
816
817 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
818 ecb_function_ int ecb_ld32 (uint32_t x)
819 {
820 int r = 0;
821
822 if (x >> 16) { x >>= 16; r += 16; }
823 if (x >> 8) { x >>= 8; r += 8; }
824 if (x >> 4) { x >>= 4; r += 4; }
825 if (x >> 2) { x >>= 2; r += 2; }
826 if (x >> 1) { r += 1; }
827
828 return r;
829 }
830
831 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
832 ecb_function_ int ecb_ld64 (uint64_t x)
833 {
834 int r = 0;
835
836 if (x >> 32) { x >>= 32; r += 32; }
837
838 return r + ecb_ld32 (x);
839 }
840 #endif
841
842 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
843 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
844 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
845 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
846
847 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
848 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
849 {
850 return ( (x * 0x0802U & 0x22110U)
851 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
852 }
853
854 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
855 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
856 {
857 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
858 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
859 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
860 x = ( x >> 8 ) | ( x << 8);
861
862 return x;
863 }
864
865 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
866 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
867 {
868 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
869 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
870 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
871 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
872 x = ( x >> 16 ) | ( x << 16);
873
874 return x;
875 }
876
877 /* popcount64 is only available on 64 bit cpus as gcc builtin */
878 /* so for this version we are lazy */
879 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
880 ecb_function_ int
881 ecb_popcount64 (uint64_t x)
882 {
883 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
884 }
885
886 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
887 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
888 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
889 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
890 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
891 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
892 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
893 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
894
895 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
896 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
897 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
898 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
899 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
900 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
901 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
902 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
903
904 #if ECB_GCC_VERSION(4,3)
905 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
906 #define ecb_bswap32(x) __builtin_bswap32 (x)
907 #define ecb_bswap64(x) __builtin_bswap64 (x)
908 #else
909 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
910 ecb_function_ uint16_t
911 ecb_bswap16 (uint16_t x)
912 {
913 return ecb_rotl16 (x, 8);
914 }
915
916 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
917 ecb_function_ uint32_t
918 ecb_bswap32 (uint32_t x)
919 {
920 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
921 }
922
923 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
924 ecb_function_ uint64_t
925 ecb_bswap64 (uint64_t x)
926 {
927 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
928 }
929 #endif
930
931 #if ECB_GCC_VERSION(4,5)
932 #define ecb_unreachable() __builtin_unreachable ()
933 #else
934 /* this seems to work fine, but gcc always emits a warning for it :/ */
935 ecb_inline void ecb_unreachable (void) ecb_noreturn;
936 ecb_inline void ecb_unreachable (void) { }
937 #endif
938
939 /* try to tell the compiler that some condition is definitely true */
940 #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
941
942 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
943 ecb_inline unsigned char
944 ecb_byteorder_helper (void)
945 {
946 const uint32_t u = 0x11223344;
947 return *(unsigned char *)&u;
948 }
949
950 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
951 ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
952 ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
953 ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
954
955 #if ECB_GCC_VERSION(3,0) || ECB_C99
956 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
957 #else
958 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
959 #endif
960
961 #if __cplusplus
962 template<typename T>
963 static inline T ecb_div_rd (T val, T div)
964 {
965 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
966 }
967 template<typename T>
968 static inline T ecb_div_ru (T val, T div)
969 {
970 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
971 }
972 #else
973 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
974 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
975 #endif
976
977 #if ecb_cplusplus_does_not_suck
978 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
979 template<typename T, int N>
980 static inline int ecb_array_length (const T (&arr)[N])
981 {
982 return N;
983 }
984 #else
985 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
986 #endif
987
988 #endif
989
990 /* ECB.H END */
991
992 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
993 /* if your architecture doesn't need memory fences, e.g. because it is
994 * single-cpu/core, or if you use libev in a project that doesn't use libev
995 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
996 * libev, in which cases the memory fences become nops.
997 * alternatively, you can remove this #error and link against libpthread,
998 * which will then provide the memory fences.
999 */
1000 # error "memory fences not defined for your architecture, please report"
1001 #endif
1002
1003 #ifndef ECB_MEMORY_FENCE
1004 # define ECB_MEMORY_FENCE do { } while (0)
1005 # define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
1006 # define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
1007 #endif
1008
1009 #define expect_false(cond) ecb_expect_false (cond)
1010 #define expect_true(cond) ecb_expect_true (cond)
1011 #define noinline ecb_noinline
1012
1013 #define inline_size ecb_inline
1014
1015 #if EV_FEATURE_CODE
1016 # define inline_speed ecb_inline
1017 #else
1018 # define inline_speed static noinline
1019 #endif
1020
1021 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
1022
1023 #if EV_MINPRI == EV_MAXPRI
1024 # define ABSPRI(w) (((W)w), 0)
1025 #else
1026 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
1027 #endif
1028
1029 #define EMPTY /* required for microsofts broken pseudo-c compiler */
1030 #define EMPTY2(a,b) /* used to suppress some warnings */
1031
1032 typedef ev_watcher *W;
1033 typedef ev_watcher_list *WL;
1034 typedef ev_watcher_time *WT;
1035
1036 #define ev_active(w) ((W)(w))->active
1037 #define ev_at(w) ((WT)(w))->at
1038
1039 #if EV_USE_REALTIME
1040 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
1041 /* giving it a reasonably high chance of working on typical architectures */
1042 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
1043 #endif
1044
1045 #if EV_USE_MONOTONIC
1046 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
1047 #endif
1048
1049 #ifndef EV_FD_TO_WIN32_HANDLE
1050 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
1051 #endif
1052 #ifndef EV_WIN32_HANDLE_TO_FD
1053 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
1054 #endif
1055 #ifndef EV_WIN32_CLOSE_FD
1056 # define EV_WIN32_CLOSE_FD(fd) close (fd)
1057 #endif
1058
1059 #ifdef _WIN32
1060 # include "ev_win32.c"
1061 #endif
1062
1063 /*****************************************************************************/
1064
1065 /* define a suitable floor function (only used by periodics atm) */
1066
1067 #if EV_USE_FLOOR
1068 # include <math.h>
1069 # define ev_floor(v) floor (v)
1070 #else
1071
1072 #include <float.h>
1073
1074 /* a floor() replacement function, should be independent of ev_tstamp type */
1075 static ev_tstamp noinline
1076 ev_floor (ev_tstamp v)
1077 {
1078 /* the choice of shift factor is not terribly important */
1079 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1080 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1081 #else
1082 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1083 #endif
1084
1085 /* argument too large for an unsigned long? */
1086 if (expect_false (v >= shift))
1087 {
1088 ev_tstamp f;
1089
1090 if (v == v - 1.)
1091 return v; /* very large number */
1092
1093 f = shift * ev_floor (v * (1. / shift));
1094 return f + ev_floor (v - f);
1095 }
1096
1097 /* special treatment for negative args? */
1098 if (expect_false (v < 0.))
1099 {
1100 ev_tstamp f = -ev_floor (-v);
1101
1102 return f - (f == v ? 0 : 1);
1103 }
1104
1105 /* fits into an unsigned long */
1106 return (unsigned long)v;
1107 }
1108
1109 #endif
1110
1111 /*****************************************************************************/
1112
1113 #ifdef __linux
1114 # include <sys/utsname.h>
1115 #endif
1116
1117 static unsigned int noinline ecb_cold
1118 ev_linux_version (void)
1119 {
1120 #ifdef __linux
1121 unsigned int v = 0;
1122 struct utsname buf;
1123 int i;
1124 char *p = buf.release;
1125
1126 if (uname (&buf))
1127 return 0;
1128
1129 for (i = 3+1; --i; )
1130 {
1131 unsigned int c = 0;
1132
1133 for (;;)
1134 {
1135 if (*p >= '0' && *p <= '9')
1136 c = c * 10 + *p++ - '0';
1137 else
1138 {
1139 p += *p == '.';
1140 break;
1141 }
1142 }
1143
1144 v = (v << 8) | c;
1145 }
1146
1147 return v;
1148 #else
1149 return 0;
1150 #endif
1151 }
1152
1153 /*****************************************************************************/
1154
1155 #if EV_AVOID_STDIO
1156 static void noinline ecb_cold
1157 ev_printerr (const char *msg)
1158 {
1159 write (STDERR_FILENO, msg, strlen (msg));
1160 }
1161 #endif
1162
1163 static void (*syserr_cb)(const char *msg) EV_THROW;
1164
1165 void ecb_cold
1166 ev_set_syserr_cb (void (*cb)(const char *msg) EV_THROW) EV_THROW
1167 {
1168 syserr_cb = cb;
1169 }
1170
1171 static void noinline ecb_cold
1172 ev_syserr (const char *msg)
1173 {
1174 if (!msg)
1175 msg = "(libev) system error";
1176
1177 if (syserr_cb)
1178 syserr_cb (msg);
1179 else
1180 {
1181 #if EV_AVOID_STDIO
1182 ev_printerr (msg);
1183 ev_printerr (": ");
1184 ev_printerr (strerror (errno));
1185 ev_printerr ("\n");
1186 #else
1187 perror (msg);
1188 #endif
1189 abort ();
1190 }
1191 }
1192
1193 static void *
1194 ev_realloc_emul (void *ptr, long size) EV_THROW
1195 {
1196 /* some systems, notably openbsd and darwin, fail to properly
1197 * implement realloc (x, 0) (as required by both ansi c-89 and
1198 * the single unix specification, so work around them here.
1199 * recently, also (at least) fedora and debian started breaking it,
1200 * despite documenting it otherwise.
1201 */
1202
1203 if (size)
1204 return realloc (ptr, size);
1205
1206 free (ptr);
1207 return 0;
1208 }
1209
1210 static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1211
1212 void ecb_cold
1213 ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
1214 {
1215 alloc = cb;
1216 }
1217
1218 inline_speed void *
1219 ev_realloc (void *ptr, long size)
1220 {
1221 ptr = alloc (ptr, size);
1222
1223 if (!ptr && size)
1224 {
1225 #if EV_AVOID_STDIO
1226 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1227 #else
1228 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1229 #endif
1230 abort ();
1231 }
1232
1233 return ptr;
1234 }
1235
1236 #define ev_malloc(size) ev_realloc (0, (size))
1237 #define ev_free(ptr) ev_realloc ((ptr), 0)
1238
1239 /*****************************************************************************/
1240
1241 /* set in reify when reification needed */
1242 #define EV_ANFD_REIFY 1
1243
1244 /* file descriptor info structure */
1245 typedef struct
1246 {
1247 WL head;
1248 unsigned char events; /* the events watched for */
1249 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1250 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1251 unsigned char unused;
1252 #if EV_USE_EPOLL
1253 unsigned int egen; /* generation counter to counter epoll bugs */
1254 #endif
1255 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1256 SOCKET handle;
1257 #endif
1258 #if EV_USE_IOCP
1259 OVERLAPPED or, ow;
1260 #endif
1261 } ANFD;
1262
1263 /* stores the pending event set for a given watcher */
1264 typedef struct
1265 {
1266 W w;
1267 int events; /* the pending event set for the given watcher */
1268 } ANPENDING;
1269
1270 #if EV_USE_INOTIFY
1271 /* hash table entry per inotify-id */
1272 typedef struct
1273 {
1274 WL head;
1275 } ANFS;
1276 #endif
1277
1278 /* Heap Entry */
1279 #if EV_HEAP_CACHE_AT
1280 /* a heap element */
1281 typedef struct {
1282 ev_tstamp at;
1283 WT w;
1284 } ANHE;
1285
1286 #define ANHE_w(he) (he).w /* access watcher, read-write */
1287 #define ANHE_at(he) (he).at /* access cached at, read-only */
1288 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1289 #else
1290 /* a heap element */
1291 typedef WT ANHE;
1292
1293 #define ANHE_w(he) (he)
1294 #define ANHE_at(he) (he)->at
1295 #define ANHE_at_cache(he)
1296 #endif
1297
1298 #if EV_MULTIPLICITY
1299
1300 struct ev_loop
1301 {
1302 ev_tstamp ev_rt_now;
1303 #define ev_rt_now ((loop)->ev_rt_now)
1304 #define VAR(name,decl) decl;
1305 #include "ev_vars.h"
1306 #undef VAR
1307 };
1308 #include "ev_wrap.h"
1309
1310 static struct ev_loop default_loop_struct;
1311 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1312
1313 #else
1314
1315 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1316 #define VAR(name,decl) static decl;
1317 #include "ev_vars.h"
1318 #undef VAR
1319
1320 static int ev_default_loop_ptr;
1321
1322 #endif
1323
1324 #if EV_FEATURE_API
1325 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1326 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1327 # define EV_INVOKE_PENDING invoke_cb (EV_A)
1328 #else
1329 # define EV_RELEASE_CB (void)0
1330 # define EV_ACQUIRE_CB (void)0
1331 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1332 #endif
1333
1334 #define EVBREAK_RECURSE 0x80
1335
1336 /*****************************************************************************/
1337
1338 #ifndef EV_HAVE_EV_TIME
1339 ev_tstamp
1340 ev_time (void) EV_THROW
1341 {
1342 #if EV_USE_REALTIME
1343 if (expect_true (have_realtime))
1344 {
1345 struct timespec ts;
1346 clock_gettime (CLOCK_REALTIME, &ts);
1347 return ts.tv_sec + ts.tv_nsec * 1e-9;
1348 }
1349 #endif
1350
1351 struct timeval tv;
1352 gettimeofday (&tv, 0);
1353 return tv.tv_sec + tv.tv_usec * 1e-6;
1354 }
1355 #endif
1356
1357 inline_size ev_tstamp
1358 get_clock (void)
1359 {
1360 #if EV_USE_MONOTONIC
1361 if (expect_true (have_monotonic))
1362 {
1363 struct timespec ts;
1364 clock_gettime (CLOCK_MONOTONIC, &ts);
1365 return ts.tv_sec + ts.tv_nsec * 1e-9;
1366 }
1367 #endif
1368
1369 return ev_time ();
1370 }
1371
1372 #if EV_MULTIPLICITY
1373 ev_tstamp
1374 ev_now (EV_P) EV_THROW
1375 {
1376 return ev_rt_now;
1377 }
1378 #endif
1379
1380 void
1381 ev_sleep (ev_tstamp delay) EV_THROW
1382 {
1383 if (delay > 0.)
1384 {
1385 #if EV_USE_NANOSLEEP
1386 struct timespec ts;
1387
1388 EV_TS_SET (ts, delay);
1389 nanosleep (&ts, 0);
1390 #elif defined _WIN32
1391 Sleep ((unsigned long)(delay * 1e3));
1392 #else
1393 struct timeval tv;
1394
1395 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1396 /* something not guaranteed by newer posix versions, but guaranteed */
1397 /* by older ones */
1398 EV_TV_SET (tv, delay);
1399 select (0, 0, 0, 0, &tv);
1400 #endif
1401 }
1402 }
1403
1404 /*****************************************************************************/
1405
1406 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1407
1408 /* find a suitable new size for the given array, */
1409 /* hopefully by rounding to a nice-to-malloc size */
1410 inline_size int
1411 array_nextsize (int elem, int cur, int cnt)
1412 {
1413 int ncur = cur + 1;
1414
1415 do
1416 ncur <<= 1;
1417 while (cnt > ncur);
1418
1419 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1420 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1421 {
1422 ncur *= elem;
1423 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1424 ncur = ncur - sizeof (void *) * 4;
1425 ncur /= elem;
1426 }
1427
1428 return ncur;
1429 }
1430
1431 static void * noinline ecb_cold
1432 array_realloc (int elem, void *base, int *cur, int cnt)
1433 {
1434 *cur = array_nextsize (elem, *cur, cnt);
1435 return ev_realloc (base, elem * *cur);
1436 }
1437
1438 #define array_init_zero(base,count) \
1439 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1440
1441 #define array_needsize(type,base,cur,cnt,init) \
1442 if (expect_false ((cnt) > (cur))) \
1443 { \
1444 int ecb_unused ocur_ = (cur); \
1445 (base) = (type *)array_realloc \
1446 (sizeof (type), (base), &(cur), (cnt)); \
1447 init ((base) + (ocur_), (cur) - ocur_); \
1448 }
1449
1450 #if 0
1451 #define array_slim(type,stem) \
1452 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1453 { \
1454 stem ## max = array_roundsize (stem ## cnt >> 1); \
1455 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1456 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1457 }
1458 #endif
1459
1460 #define array_free(stem, idx) \
1461 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1462
1463 /*****************************************************************************/
1464
1465 /* dummy callback for pending events */
1466 static void noinline
1467 pendingcb (EV_P_ ev_prepare *w, int revents)
1468 {
1469 }
1470
1471 void noinline
1472 ev_feed_event (EV_P_ void *w, int revents) EV_THROW
1473 {
1474 W w_ = (W)w;
1475 int pri = ABSPRI (w_);
1476
1477 if (expect_false (w_->pending))
1478 pendings [pri][w_->pending - 1].events |= revents;
1479 else
1480 {
1481 w_->pending = ++pendingcnt [pri];
1482 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1483 pendings [pri][w_->pending - 1].w = w_;
1484 pendings [pri][w_->pending - 1].events = revents;
1485 }
1486
1487 pendingpri = NUMPRI - 1;
1488 }
1489
1490 inline_speed void
1491 feed_reverse (EV_P_ W w)
1492 {
1493 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1494 rfeeds [rfeedcnt++] = w;
1495 }
1496
1497 inline_size void
1498 feed_reverse_done (EV_P_ int revents)
1499 {
1500 do
1501 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1502 while (rfeedcnt);
1503 }
1504
1505 inline_speed void
1506 queue_events (EV_P_ W *events, int eventcnt, int type)
1507 {
1508 int i;
1509
1510 for (i = 0; i < eventcnt; ++i)
1511 ev_feed_event (EV_A_ events [i], type);
1512 }
1513
1514 /*****************************************************************************/
1515
1516 inline_speed void
1517 fd_event_nocheck (EV_P_ int fd, int revents)
1518 {
1519 ANFD *anfd = anfds + fd;
1520 ev_io *w;
1521
1522 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1523 {
1524 int ev = w->events & revents;
1525
1526 if (ev)
1527 ev_feed_event (EV_A_ (W)w, ev);
1528 }
1529 }
1530
1531 /* do not submit kernel events for fds that have reify set */
1532 /* because that means they changed while we were polling for new events */
1533 inline_speed void
1534 fd_event (EV_P_ int fd, int revents)
1535 {
1536 ANFD *anfd = anfds + fd;
1537
1538 if (expect_true (!anfd->reify))
1539 fd_event_nocheck (EV_A_ fd, revents);
1540 }
1541
1542 void
1543 ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
1544 {
1545 if (fd >= 0 && fd < anfdmax)
1546 fd_event_nocheck (EV_A_ fd, revents);
1547 }
1548
1549 /* make sure the external fd watch events are in-sync */
1550 /* with the kernel/libev internal state */
1551 inline_size void
1552 fd_reify (EV_P)
1553 {
1554 int i;
1555
1556 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1557 for (i = 0; i < fdchangecnt; ++i)
1558 {
1559 int fd = fdchanges [i];
1560 ANFD *anfd = anfds + fd;
1561
1562 if (anfd->reify & EV__IOFDSET && anfd->head)
1563 {
1564 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1565
1566 if (handle != anfd->handle)
1567 {
1568 unsigned long arg;
1569
1570 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1571
1572 /* handle changed, but fd didn't - we need to do it in two steps */
1573 backend_modify (EV_A_ fd, anfd->events, 0);
1574 anfd->events = 0;
1575 anfd->handle = handle;
1576 }
1577 }
1578 }
1579 #endif
1580
1581 for (i = 0; i < fdchangecnt; ++i)
1582 {
1583 int fd = fdchanges [i];
1584 ANFD *anfd = anfds + fd;
1585 ev_io *w;
1586
1587 unsigned char o_events = anfd->events;
1588 unsigned char o_reify = anfd->reify;
1589
1590 anfd->reify = 0;
1591
1592 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1593 {
1594 anfd->events = 0;
1595
1596 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1597 anfd->events |= (unsigned char)w->events;
1598
1599 if (o_events != anfd->events)
1600 o_reify = EV__IOFDSET; /* actually |= */
1601 }
1602
1603 if (o_reify & EV__IOFDSET)
1604 backend_modify (EV_A_ fd, o_events, anfd->events);
1605 }
1606
1607 fdchangecnt = 0;
1608 }
1609
1610 /* something about the given fd changed */
1611 inline_size void
1612 fd_change (EV_P_ int fd, int flags)
1613 {
1614 unsigned char reify = anfds [fd].reify;
1615 anfds [fd].reify |= flags;
1616
1617 if (expect_true (!reify))
1618 {
1619 ++fdchangecnt;
1620 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1621 fdchanges [fdchangecnt - 1] = fd;
1622 }
1623 }
1624
1625 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1626 inline_speed void ecb_cold
1627 fd_kill (EV_P_ int fd)
1628 {
1629 ev_io *w;
1630
1631 while ((w = (ev_io *)anfds [fd].head))
1632 {
1633 ev_io_stop (EV_A_ w);
1634 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1635 }
1636 }
1637
1638 /* check whether the given fd is actually valid, for error recovery */
1639 inline_size int ecb_cold
1640 fd_valid (int fd)
1641 {
1642 #ifdef _WIN32
1643 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1644 #else
1645 return fcntl (fd, F_GETFD) != -1;
1646 #endif
1647 }
1648
1649 /* called on EBADF to verify fds */
1650 static void noinline ecb_cold
1651 fd_ebadf (EV_P)
1652 {
1653 int fd;
1654
1655 for (fd = 0; fd < anfdmax; ++fd)
1656 if (anfds [fd].events)
1657 if (!fd_valid (fd) && errno == EBADF)
1658 fd_kill (EV_A_ fd);
1659 }
1660
1661 /* called on ENOMEM in select/poll to kill some fds and retry */
1662 static void noinline ecb_cold
1663 fd_enomem (EV_P)
1664 {
1665 int fd;
1666
1667 for (fd = anfdmax; fd--; )
1668 if (anfds [fd].events)
1669 {
1670 fd_kill (EV_A_ fd);
1671 break;
1672 }
1673 }
1674
1675 /* usually called after fork if backend needs to re-arm all fds from scratch */
1676 static void noinline
1677 fd_rearm_all (EV_P)
1678 {
1679 int fd;
1680
1681 for (fd = 0; fd < anfdmax; ++fd)
1682 if (anfds [fd].events)
1683 {
1684 anfds [fd].events = 0;
1685 anfds [fd].emask = 0;
1686 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1687 }
1688 }
1689
1690 /* used to prepare libev internal fd's */
1691 /* this is not fork-safe */
1692 inline_speed void
1693 fd_intern (int fd)
1694 {
1695 #ifdef _WIN32
1696 unsigned long arg = 1;
1697 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1698 #else
1699 fcntl (fd, F_SETFD, FD_CLOEXEC);
1700 fcntl (fd, F_SETFL, O_NONBLOCK);
1701 #endif
1702 }
1703
1704 /*****************************************************************************/
1705
1706 /*
1707 * the heap functions want a real array index. array index 0 is guaranteed to not
1708 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1709 * the branching factor of the d-tree.
1710 */
1711
1712 /*
1713 * at the moment we allow libev the luxury of two heaps,
1714 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1715 * which is more cache-efficient.
1716 * the difference is about 5% with 50000+ watchers.
1717 */
1718 #if EV_USE_4HEAP
1719
1720 #define DHEAP 4
1721 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1722 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1723 #define UPHEAP_DONE(p,k) ((p) == (k))
1724
1725 /* away from the root */
1726 inline_speed void
1727 downheap (ANHE *heap, int N, int k)
1728 {
1729 ANHE he = heap [k];
1730 ANHE *E = heap + N + HEAP0;
1731
1732 for (;;)
1733 {
1734 ev_tstamp minat;
1735 ANHE *minpos;
1736 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1737
1738 /* find minimum child */
1739 if (expect_true (pos + DHEAP - 1 < E))
1740 {
1741 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1742 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1743 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1744 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1745 }
1746 else if (pos < E)
1747 {
1748 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1749 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1750 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1751 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1752 }
1753 else
1754 break;
1755
1756 if (ANHE_at (he) <= minat)
1757 break;
1758
1759 heap [k] = *minpos;
1760 ev_active (ANHE_w (*minpos)) = k;
1761
1762 k = minpos - heap;
1763 }
1764
1765 heap [k] = he;
1766 ev_active (ANHE_w (he)) = k;
1767 }
1768
1769 #else /* 4HEAP */
1770
1771 #define HEAP0 1
1772 #define HPARENT(k) ((k) >> 1)
1773 #define UPHEAP_DONE(p,k) (!(p))
1774
1775 /* away from the root */
1776 inline_speed void
1777 downheap (ANHE *heap, int N, int k)
1778 {
1779 ANHE he = heap [k];
1780
1781 for (;;)
1782 {
1783 int c = k << 1;
1784
1785 if (c >= N + HEAP0)
1786 break;
1787
1788 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1789 ? 1 : 0;
1790
1791 if (ANHE_at (he) <= ANHE_at (heap [c]))
1792 break;
1793
1794 heap [k] = heap [c];
1795 ev_active (ANHE_w (heap [k])) = k;
1796
1797 k = c;
1798 }
1799
1800 heap [k] = he;
1801 ev_active (ANHE_w (he)) = k;
1802 }
1803 #endif
1804
1805 /* towards the root */
1806 inline_speed void
1807 upheap (ANHE *heap, int k)
1808 {
1809 ANHE he = heap [k];
1810
1811 for (;;)
1812 {
1813 int p = HPARENT (k);
1814
1815 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1816 break;
1817
1818 heap [k] = heap [p];
1819 ev_active (ANHE_w (heap [k])) = k;
1820 k = p;
1821 }
1822
1823 heap [k] = he;
1824 ev_active (ANHE_w (he)) = k;
1825 }
1826
1827 /* move an element suitably so it is in a correct place */
1828 inline_size void
1829 adjustheap (ANHE *heap, int N, int k)
1830 {
1831 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1832 upheap (heap, k);
1833 else
1834 downheap (heap, N, k);
1835 }
1836
1837 /* rebuild the heap: this function is used only once and executed rarely */
1838 inline_size void
1839 reheap (ANHE *heap, int N)
1840 {
1841 int i;
1842
1843 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1844 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1845 for (i = 0; i < N; ++i)
1846 upheap (heap, i + HEAP0);
1847 }
1848
1849 /*****************************************************************************/
1850
1851 /* associate signal watchers to a signal signal */
1852 typedef struct
1853 {
1854 EV_ATOMIC_T pending;
1855 #if EV_MULTIPLICITY
1856 EV_P;
1857 #endif
1858 WL head;
1859 } ANSIG;
1860
1861 static ANSIG signals [EV_NSIG - 1];
1862
1863 /*****************************************************************************/
1864
1865 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1866
1867 static void noinline ecb_cold
1868 evpipe_init (EV_P)
1869 {
1870 if (!ev_is_active (&pipe_w))
1871 {
1872 # if EV_USE_EVENTFD
1873 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1874 if (evfd < 0 && errno == EINVAL)
1875 evfd = eventfd (0, 0);
1876
1877 if (evfd >= 0)
1878 {
1879 evpipe [0] = -1;
1880 fd_intern (evfd); /* doing it twice doesn't hurt */
1881 ev_io_set (&pipe_w, evfd, EV_READ);
1882 }
1883 else
1884 # endif
1885 {
1886 while (pipe (evpipe))
1887 ev_syserr ("(libev) error creating signal/async pipe");
1888
1889 fd_intern (evpipe [0]);
1890 fd_intern (evpipe [1]);
1891 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1892 }
1893
1894 ev_io_start (EV_A_ &pipe_w);
1895 ev_unref (EV_A); /* watcher should not keep loop alive */
1896 }
1897 }
1898
1899 inline_speed void
1900 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1901 {
1902 ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
1903
1904 if (expect_true (*flag))
1905 return;
1906
1907 *flag = 1;
1908 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1909
1910 pipe_write_skipped = 1;
1911
1912 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1913
1914 if (pipe_write_wanted)
1915 {
1916 int old_errno;
1917
1918 pipe_write_skipped = 0;
1919 ECB_MEMORY_FENCE_RELEASE;
1920
1921 old_errno = errno; /* save errno because write will clobber it */
1922
1923 #if EV_USE_EVENTFD
1924 if (evfd >= 0)
1925 {
1926 uint64_t counter = 1;
1927 write (evfd, &counter, sizeof (uint64_t));
1928 }
1929 else
1930 #endif
1931 {
1932 #ifdef _WIN32
1933 WSABUF buf;
1934 DWORD sent;
1935 buf.buf = &buf;
1936 buf.len = 1;
1937 WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
1938 #else
1939 write (evpipe [1], &(evpipe [1]), 1);
1940 #endif
1941 }
1942
1943 errno = old_errno;
1944 }
1945 }
1946
1947 /* called whenever the libev signal pipe */
1948 /* got some events (signal, async) */
1949 static void
1950 pipecb (EV_P_ ev_io *iow, int revents)
1951 {
1952 int i;
1953
1954 if (revents & EV_READ)
1955 {
1956 #if EV_USE_EVENTFD
1957 if (evfd >= 0)
1958 {
1959 uint64_t counter;
1960 read (evfd, &counter, sizeof (uint64_t));
1961 }
1962 else
1963 #endif
1964 {
1965 char dummy[4];
1966 #ifdef _WIN32
1967 WSABUF buf;
1968 DWORD recvd;
1969 DWORD flags = 0;
1970 buf.buf = dummy;
1971 buf.len = sizeof (dummy);
1972 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
1973 #else
1974 read (evpipe [0], &dummy, sizeof (dummy));
1975 #endif
1976 }
1977 }
1978
1979 pipe_write_skipped = 0;
1980
1981 ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
1982
1983 #if EV_SIGNAL_ENABLE
1984 if (sig_pending)
1985 {
1986 sig_pending = 0;
1987
1988 ECB_MEMORY_FENCE;
1989
1990 for (i = EV_NSIG - 1; i--; )
1991 if (expect_false (signals [i].pending))
1992 ev_feed_signal_event (EV_A_ i + 1);
1993 }
1994 #endif
1995
1996 #if EV_ASYNC_ENABLE
1997 if (async_pending)
1998 {
1999 async_pending = 0;
2000
2001 ECB_MEMORY_FENCE;
2002
2003 for (i = asynccnt; i--; )
2004 if (asyncs [i]->sent)
2005 {
2006 asyncs [i]->sent = 0;
2007 ECB_MEMORY_FENCE_RELEASE;
2008 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
2009 }
2010 }
2011 #endif
2012 }
2013
2014 /*****************************************************************************/
2015
2016 void
2017 ev_feed_signal (int signum) EV_THROW
2018 {
2019 #if EV_MULTIPLICITY
2020 EV_P = signals [signum - 1].loop;
2021
2022 if (!EV_A)
2023 return;
2024 #endif
2025
2026 if (!ev_active (&pipe_w))
2027 return;
2028
2029 signals [signum - 1].pending = 1;
2030 evpipe_write (EV_A_ &sig_pending);
2031 }
2032
2033 static void
2034 ev_sighandler (int signum)
2035 {
2036 #ifdef _WIN32
2037 signal (signum, ev_sighandler);
2038 #endif
2039
2040 ev_feed_signal (signum);
2041 }
2042
2043 void noinline
2044 ev_feed_signal_event (EV_P_ int signum) EV_THROW
2045 {
2046 WL w;
2047
2048 if (expect_false (signum <= 0 || signum >= EV_NSIG))
2049 return;
2050
2051 --signum;
2052
2053 #if EV_MULTIPLICITY
2054 /* it is permissible to try to feed a signal to the wrong loop */
2055 /* or, likely more useful, feeding a signal nobody is waiting for */
2056
2057 if (expect_false (signals [signum].loop != EV_A))
2058 return;
2059 #endif
2060
2061 signals [signum].pending = 0;
2062 ECB_MEMORY_FENCE_RELEASE;
2063
2064 for (w = signals [signum].head; w; w = w->next)
2065 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2066 }
2067
2068 #if EV_USE_SIGNALFD
2069 static void
2070 sigfdcb (EV_P_ ev_io *iow, int revents)
2071 {
2072 struct signalfd_siginfo si[2], *sip; /* these structs are big */
2073
2074 for (;;)
2075 {
2076 ssize_t res = read (sigfd, si, sizeof (si));
2077
2078 /* not ISO-C, as res might be -1, but works with SuS */
2079 for (sip = si; (char *)sip < (char *)si + res; ++sip)
2080 ev_feed_signal_event (EV_A_ sip->ssi_signo);
2081
2082 if (res < (ssize_t)sizeof (si))
2083 break;
2084 }
2085 }
2086 #endif
2087
2088 #endif
2089
2090 /*****************************************************************************/
2091
2092 #if EV_CHILD_ENABLE
2093 static WL childs [EV_PID_HASHSIZE];
2094
2095 static ev_signal childev;
2096
2097 #ifndef WIFCONTINUED
2098 # define WIFCONTINUED(status) 0
2099 #endif
2100
2101 /* handle a single child status event */
2102 inline_speed void
2103 child_reap (EV_P_ int chain, int pid, int status)
2104 {
2105 ev_child *w;
2106 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2107
2108 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2109 {
2110 if ((w->pid == pid || !w->pid)
2111 && (!traced || (w->flags & 1)))
2112 {
2113 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2114 w->rpid = pid;
2115 w->rstatus = status;
2116 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2117 }
2118 }
2119 }
2120
2121 #ifndef WCONTINUED
2122 # define WCONTINUED 0
2123 #endif
2124
2125 /* called on sigchld etc., calls waitpid */
2126 static void
2127 childcb (EV_P_ ev_signal *sw, int revents)
2128 {
2129 int pid, status;
2130
2131 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
2132 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
2133 if (!WCONTINUED
2134 || errno != EINVAL
2135 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2136 return;
2137
2138 /* make sure we are called again until all children have been reaped */
2139 /* we need to do it this way so that the callback gets called before we continue */
2140 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2141
2142 child_reap (EV_A_ pid, pid, status);
2143 if ((EV_PID_HASHSIZE) > 1)
2144 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2145 }
2146
2147 #endif
2148
2149 /*****************************************************************************/
2150
2151 #if EV_USE_IOCP
2152 # include "ev_iocp.c"
2153 #endif
2154 #if EV_USE_PORT
2155 # include "ev_port.c"
2156 #endif
2157 #if EV_USE_KQUEUE
2158 # include "ev_kqueue.c"
2159 #endif
2160 #if EV_USE_EPOLL
2161 # include "ev_epoll.c"
2162 #endif
2163 #if EV_USE_POLL
2164 # include "ev_poll.c"
2165 #endif
2166 #if EV_USE_SELECT
2167 # include "ev_select.c"
2168 #endif
2169
2170 int ecb_cold
2171 ev_version_major (void) EV_THROW
2172 {
2173 return EV_VERSION_MAJOR;
2174 }
2175
2176 int ecb_cold
2177 ev_version_minor (void) EV_THROW
2178 {
2179 return EV_VERSION_MINOR;
2180 }
2181
2182 /* return true if we are running with elevated privileges and should ignore env variables */
2183 int inline_size ecb_cold
2184 enable_secure (void)
2185 {
2186 #ifdef _WIN32
2187 return 0;
2188 #else
2189 return getuid () != geteuid ()
2190 || getgid () != getegid ();
2191 #endif
2192 }
2193
2194 unsigned int ecb_cold
2195 ev_supported_backends (void) EV_THROW
2196 {
2197 unsigned int flags = 0;
2198
2199 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2200 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2201 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2202 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2203 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2204
2205 return flags;
2206 }
2207
2208 unsigned int ecb_cold
2209 ev_recommended_backends (void) EV_THROW
2210 {
2211 unsigned int flags = ev_supported_backends ();
2212
2213 #ifndef __NetBSD__
2214 /* kqueue is borked on everything but netbsd apparently */
2215 /* it usually doesn't work correctly on anything but sockets and pipes */
2216 flags &= ~EVBACKEND_KQUEUE;
2217 #endif
2218 #ifdef __APPLE__
2219 /* only select works correctly on that "unix-certified" platform */
2220 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2221 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2222 #endif
2223 #ifdef __FreeBSD__
2224 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2225 #endif
2226
2227 return flags;
2228 }
2229
2230 unsigned int ecb_cold
2231 ev_embeddable_backends (void) EV_THROW
2232 {
2233 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2234
2235 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2236 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2237 flags &= ~EVBACKEND_EPOLL;
2238
2239 return flags;
2240 }
2241
2242 unsigned int
2243 ev_backend (EV_P) EV_THROW
2244 {
2245 return backend;
2246 }
2247
2248 #if EV_FEATURE_API
2249 unsigned int
2250 ev_iteration (EV_P) EV_THROW
2251 {
2252 return loop_count;
2253 }
2254
2255 unsigned int
2256 ev_depth (EV_P) EV_THROW
2257 {
2258 return loop_depth;
2259 }
2260
2261 void
2262 ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2263 {
2264 io_blocktime = interval;
2265 }
2266
2267 void
2268 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2269 {
2270 timeout_blocktime = interval;
2271 }
2272
2273 void
2274 ev_set_userdata (EV_P_ void *data) EV_THROW
2275 {
2276 userdata = data;
2277 }
2278
2279 void *
2280 ev_userdata (EV_P) EV_THROW
2281 {
2282 return userdata;
2283 }
2284
2285 void
2286 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) EV_THROW
2287 {
2288 invoke_cb = invoke_pending_cb;
2289 }
2290
2291 void
2292 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
2293 {
2294 release_cb = release;
2295 acquire_cb = acquire;
2296 }
2297 #endif
2298
2299 /* initialise a loop structure, must be zero-initialised */
2300 static void noinline ecb_cold
2301 loop_init (EV_P_ unsigned int flags) EV_THROW
2302 {
2303 if (!backend)
2304 {
2305 origflags = flags;
2306
2307 #if EV_USE_REALTIME
2308 if (!have_realtime)
2309 {
2310 struct timespec ts;
2311
2312 if (!clock_gettime (CLOCK_REALTIME, &ts))
2313 have_realtime = 1;
2314 }
2315 #endif
2316
2317 #if EV_USE_MONOTONIC
2318 if (!have_monotonic)
2319 {
2320 struct timespec ts;
2321
2322 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2323 have_monotonic = 1;
2324 }
2325 #endif
2326
2327 /* pid check not overridable via env */
2328 #ifndef _WIN32
2329 if (flags & EVFLAG_FORKCHECK)
2330 curpid = getpid ();
2331 #endif
2332
2333 if (!(flags & EVFLAG_NOENV)
2334 && !enable_secure ()
2335 && getenv ("LIBEV_FLAGS"))
2336 flags = atoi (getenv ("LIBEV_FLAGS"));
2337
2338 ev_rt_now = ev_time ();
2339 mn_now = get_clock ();
2340 now_floor = mn_now;
2341 rtmn_diff = ev_rt_now - mn_now;
2342 #if EV_FEATURE_API
2343 invoke_cb = ev_invoke_pending;
2344 #endif
2345
2346 io_blocktime = 0.;
2347 timeout_blocktime = 0.;
2348 backend = 0;
2349 backend_fd = -1;
2350 sig_pending = 0;
2351 #if EV_ASYNC_ENABLE
2352 async_pending = 0;
2353 #endif
2354 pipe_write_skipped = 0;
2355 pipe_write_wanted = 0;
2356 #if EV_USE_INOTIFY
2357 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2358 #endif
2359 #if EV_USE_SIGNALFD
2360 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2361 #endif
2362
2363 if (!(flags & EVBACKEND_MASK))
2364 flags |= ev_recommended_backends ();
2365
2366 #if EV_USE_IOCP
2367 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2368 #endif
2369 #if EV_USE_PORT
2370 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2371 #endif
2372 #if EV_USE_KQUEUE
2373 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2374 #endif
2375 #if EV_USE_EPOLL
2376 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2377 #endif
2378 #if EV_USE_POLL
2379 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2380 #endif
2381 #if EV_USE_SELECT
2382 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2383 #endif
2384
2385 ev_prepare_init (&pending_w, pendingcb);
2386
2387 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2388 ev_init (&pipe_w, pipecb);
2389 ev_set_priority (&pipe_w, EV_MAXPRI);
2390 #endif
2391 }
2392 }
2393
2394 /* free up a loop structure */
2395 void ecb_cold
2396 ev_loop_destroy (EV_P)
2397 {
2398 int i;
2399
2400 #if EV_MULTIPLICITY
2401 /* mimic free (0) */
2402 if (!EV_A)
2403 return;
2404 #endif
2405
2406 #if EV_CLEANUP_ENABLE
2407 /* queue cleanup watchers (and execute them) */
2408 if (expect_false (cleanupcnt))
2409 {
2410 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2411 EV_INVOKE_PENDING;
2412 }
2413 #endif
2414
2415 #if EV_CHILD_ENABLE
2416 if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
2417 {
2418 ev_ref (EV_A); /* child watcher */
2419 ev_signal_stop (EV_A_ &childev);
2420 }
2421 #endif
2422
2423 if (ev_is_active (&pipe_w))
2424 {
2425 /*ev_ref (EV_A);*/
2426 /*ev_io_stop (EV_A_ &pipe_w);*/
2427
2428 #if EV_USE_EVENTFD
2429 if (evfd >= 0)
2430 close (evfd);
2431 #endif
2432
2433 if (evpipe [0] >= 0)
2434 {
2435 EV_WIN32_CLOSE_FD (evpipe [0]);
2436 EV_WIN32_CLOSE_FD (evpipe [1]);
2437 }
2438 }
2439
2440 #if EV_USE_SIGNALFD
2441 if (ev_is_active (&sigfd_w))
2442 close (sigfd);
2443 #endif
2444
2445 #if EV_USE_INOTIFY
2446 if (fs_fd >= 0)
2447 close (fs_fd);
2448 #endif
2449
2450 if (backend_fd >= 0)
2451 close (backend_fd);
2452
2453 #if EV_USE_IOCP
2454 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2455 #endif
2456 #if EV_USE_PORT
2457 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2458 #endif
2459 #if EV_USE_KQUEUE
2460 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2461 #endif
2462 #if EV_USE_EPOLL
2463 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2464 #endif
2465 #if EV_USE_POLL
2466 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2467 #endif
2468 #if EV_USE_SELECT
2469 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2470 #endif
2471
2472 for (i = NUMPRI; i--; )
2473 {
2474 array_free (pending, [i]);
2475 #if EV_IDLE_ENABLE
2476 array_free (idle, [i]);
2477 #endif
2478 }
2479
2480 ev_free (anfds); anfds = 0; anfdmax = 0;
2481
2482 /* have to use the microsoft-never-gets-it-right macro */
2483 array_free (rfeed, EMPTY);
2484 array_free (fdchange, EMPTY);
2485 array_free (timer, EMPTY);
2486 #if EV_PERIODIC_ENABLE
2487 array_free (periodic, EMPTY);
2488 #endif
2489 #if EV_FORK_ENABLE
2490 array_free (fork, EMPTY);
2491 #endif
2492 #if EV_CLEANUP_ENABLE
2493 array_free (cleanup, EMPTY);
2494 #endif
2495 array_free (prepare, EMPTY);
2496 array_free (check, EMPTY);
2497 #if EV_ASYNC_ENABLE
2498 array_free (async, EMPTY);
2499 #endif
2500
2501 backend = 0;
2502
2503 #if EV_MULTIPLICITY
2504 if (ev_is_default_loop (EV_A))
2505 #endif
2506 ev_default_loop_ptr = 0;
2507 #if EV_MULTIPLICITY
2508 else
2509 ev_free (EV_A);
2510 #endif
2511 }
2512
2513 #if EV_USE_INOTIFY
2514 inline_size void infy_fork (EV_P);
2515 #endif
2516
2517 inline_size void
2518 loop_fork (EV_P)
2519 {
2520 #if EV_USE_PORT
2521 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2522 #endif
2523 #if EV_USE_KQUEUE
2524 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2525 #endif
2526 #if EV_USE_EPOLL
2527 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2528 #endif
2529 #if EV_USE_INOTIFY
2530 infy_fork (EV_A);
2531 #endif
2532
2533 if (ev_is_active (&pipe_w))
2534 {
2535 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2536
2537 ev_ref (EV_A);
2538 ev_io_stop (EV_A_ &pipe_w);
2539
2540 #if EV_USE_EVENTFD
2541 if (evfd >= 0)
2542 close (evfd);
2543 #endif
2544
2545 if (evpipe [0] >= 0)
2546 {
2547 EV_WIN32_CLOSE_FD (evpipe [0]);
2548 EV_WIN32_CLOSE_FD (evpipe [1]);
2549 }
2550
2551 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2552 evpipe_init (EV_A);
2553 /* iterate over everything, in case we missed something before */
2554 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2555 #endif
2556 }
2557
2558 postfork = 0;
2559 }
2560
2561 #if EV_MULTIPLICITY
2562
2563 struct ev_loop * ecb_cold
2564 ev_loop_new (unsigned int flags) EV_THROW
2565 {
2566 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2567
2568 memset (EV_A, 0, sizeof (struct ev_loop));
2569 loop_init (EV_A_ flags);
2570
2571 if (ev_backend (EV_A))
2572 return EV_A;
2573
2574 ev_free (EV_A);
2575 return 0;
2576 }
2577
2578 #endif /* multiplicity */
2579
2580 #if EV_VERIFY
2581 static void noinline ecb_cold
2582 verify_watcher (EV_P_ W w)
2583 {
2584 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2585
2586 if (w->pending)
2587 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2588 }
2589
2590 static void noinline ecb_cold
2591 verify_heap (EV_P_ ANHE *heap, int N)
2592 {
2593 int i;
2594
2595 for (i = HEAP0; i < N + HEAP0; ++i)
2596 {
2597 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2598 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2599 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2600
2601 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2602 }
2603 }
2604
2605 static void noinline ecb_cold
2606 array_verify (EV_P_ W *ws, int cnt)
2607 {
2608 while (cnt--)
2609 {
2610 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2611 verify_watcher (EV_A_ ws [cnt]);
2612 }
2613 }
2614 #endif
2615
2616 #if EV_FEATURE_API
2617 void ecb_cold
2618 ev_verify (EV_P) EV_THROW
2619 {
2620 #if EV_VERIFY
2621 int i;
2622 WL w, w2;
2623
2624 assert (activecnt >= -1);
2625
2626 assert (fdchangemax >= fdchangecnt);
2627 for (i = 0; i < fdchangecnt; ++i)
2628 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2629
2630 assert (anfdmax >= 0);
2631 for (i = 0; i < anfdmax; ++i)
2632 {
2633 int j = 0;
2634
2635 for (w = w2 = anfds [i].head; w; w = w->next)
2636 {
2637 verify_watcher (EV_A_ (W)w);
2638
2639 if (j++ & 1)
2640 {
2641 assert (("libev: io watcher list contains a loop", w != w2));
2642 w2 = w2->next;
2643 }
2644
2645 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2646 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2647 }
2648 }
2649
2650 assert (timermax >= timercnt);
2651 verify_heap (EV_A_ timers, timercnt);
2652
2653 #if EV_PERIODIC_ENABLE
2654 assert (periodicmax >= periodiccnt);
2655 verify_heap (EV_A_ periodics, periodiccnt);
2656 #endif
2657
2658 for (i = NUMPRI; i--; )
2659 {
2660 assert (pendingmax [i] >= pendingcnt [i]);
2661 #if EV_IDLE_ENABLE
2662 assert (idleall >= 0);
2663 assert (idlemax [i] >= idlecnt [i]);
2664 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2665 #endif
2666 }
2667
2668 #if EV_FORK_ENABLE
2669 assert (forkmax >= forkcnt);
2670 array_verify (EV_A_ (W *)forks, forkcnt);
2671 #endif
2672
2673 #if EV_CLEANUP_ENABLE
2674 assert (cleanupmax >= cleanupcnt);
2675 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2676 #endif
2677
2678 #if EV_ASYNC_ENABLE
2679 assert (asyncmax >= asynccnt);
2680 array_verify (EV_A_ (W *)asyncs, asynccnt);
2681 #endif
2682
2683 #if EV_PREPARE_ENABLE
2684 assert (preparemax >= preparecnt);
2685 array_verify (EV_A_ (W *)prepares, preparecnt);
2686 #endif
2687
2688 #if EV_CHECK_ENABLE
2689 assert (checkmax >= checkcnt);
2690 array_verify (EV_A_ (W *)checks, checkcnt);
2691 #endif
2692
2693 # if 0
2694 #if EV_CHILD_ENABLE
2695 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2696 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2697 #endif
2698 # endif
2699 #endif
2700 }
2701 #endif
2702
2703 #if EV_MULTIPLICITY
2704 struct ev_loop * ecb_cold
2705 #else
2706 int
2707 #endif
2708 ev_default_loop (unsigned int flags) EV_THROW
2709 {
2710 if (!ev_default_loop_ptr)
2711 {
2712 #if EV_MULTIPLICITY
2713 EV_P = ev_default_loop_ptr = &default_loop_struct;
2714 #else
2715 ev_default_loop_ptr = 1;
2716 #endif
2717
2718 loop_init (EV_A_ flags);
2719
2720 if (ev_backend (EV_A))
2721 {
2722 #if EV_CHILD_ENABLE
2723 ev_signal_init (&childev, childcb, SIGCHLD);
2724 ev_set_priority (&childev, EV_MAXPRI);
2725 ev_signal_start (EV_A_ &childev);
2726 ev_unref (EV_A); /* child watcher should not keep loop alive */
2727 #endif
2728 }
2729 else
2730 ev_default_loop_ptr = 0;
2731 }
2732
2733 return ev_default_loop_ptr;
2734 }
2735
2736 void
2737 ev_loop_fork (EV_P) EV_THROW
2738 {
2739 postfork = 1;
2740 }
2741
2742 /*****************************************************************************/
2743
2744 void
2745 ev_invoke (EV_P_ void *w, int revents)
2746 {
2747 EV_CB_INVOKE ((W)w, revents);
2748 }
2749
2750 unsigned int
2751 ev_pending_count (EV_P) EV_THROW
2752 {
2753 int pri;
2754 unsigned int count = 0;
2755
2756 for (pri = NUMPRI; pri--; )
2757 count += pendingcnt [pri];
2758
2759 return count;
2760 }
2761
2762 void noinline
2763 ev_invoke_pending (EV_P)
2764 {
2765 pendingpri = NUMPRI;
2766
2767 while (pendingpri) /* pendingpri possibly gets modified in the inner loop */
2768 {
2769 --pendingpri;
2770
2771 while (pendingcnt [pendingpri])
2772 {
2773 ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
2774
2775 p->w->pending = 0;
2776 EV_CB_INVOKE (p->w, p->events);
2777 EV_FREQUENT_CHECK;
2778 }
2779 }
2780 }
2781
2782 #if EV_IDLE_ENABLE
2783 /* make idle watchers pending. this handles the "call-idle */
2784 /* only when higher priorities are idle" logic */
2785 inline_size void
2786 idle_reify (EV_P)
2787 {
2788 if (expect_false (idleall))
2789 {
2790 int pri;
2791
2792 for (pri = NUMPRI; pri--; )
2793 {
2794 if (pendingcnt [pri])
2795 break;
2796
2797 if (idlecnt [pri])
2798 {
2799 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2800 break;
2801 }
2802 }
2803 }
2804 }
2805 #endif
2806
2807 /* make timers pending */
2808 inline_size void
2809 timers_reify (EV_P)
2810 {
2811 EV_FREQUENT_CHECK;
2812
2813 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2814 {
2815 do
2816 {
2817 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2818
2819 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2820
2821 /* first reschedule or stop timer */
2822 if (w->repeat)
2823 {
2824 ev_at (w) += w->repeat;
2825 if (ev_at (w) < mn_now)
2826 ev_at (w) = mn_now;
2827
2828 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2829
2830 ANHE_at_cache (timers [HEAP0]);
2831 downheap (timers, timercnt, HEAP0);
2832 }
2833 else
2834 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2835
2836 EV_FREQUENT_CHECK;
2837 feed_reverse (EV_A_ (W)w);
2838 }
2839 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2840
2841 feed_reverse_done (EV_A_ EV_TIMER);
2842 }
2843 }
2844
2845 #if EV_PERIODIC_ENABLE
2846
2847 static void noinline
2848 periodic_recalc (EV_P_ ev_periodic *w)
2849 {
2850 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2851 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2852
2853 /* the above almost always errs on the low side */
2854 while (at <= ev_rt_now)
2855 {
2856 ev_tstamp nat = at + w->interval;
2857
2858 /* when resolution fails us, we use ev_rt_now */
2859 if (expect_false (nat == at))
2860 {
2861 at = ev_rt_now;
2862 break;
2863 }
2864
2865 at = nat;
2866 }
2867
2868 ev_at (w) = at;
2869 }
2870
2871 /* make periodics pending */
2872 inline_size void
2873 periodics_reify (EV_P)
2874 {
2875 EV_FREQUENT_CHECK;
2876
2877 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2878 {
2879 do
2880 {
2881 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2882
2883 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2884
2885 /* first reschedule or stop timer */
2886 if (w->reschedule_cb)
2887 {
2888 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2889
2890 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2891
2892 ANHE_at_cache (periodics [HEAP0]);
2893 downheap (periodics, periodiccnt, HEAP0);
2894 }
2895 else if (w->interval)
2896 {
2897 periodic_recalc (EV_A_ w);
2898 ANHE_at_cache (periodics [HEAP0]);
2899 downheap (periodics, periodiccnt, HEAP0);
2900 }
2901 else
2902 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2903
2904 EV_FREQUENT_CHECK;
2905 feed_reverse (EV_A_ (W)w);
2906 }
2907 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2908
2909 feed_reverse_done (EV_A_ EV_PERIODIC);
2910 }
2911 }
2912
2913 /* simply recalculate all periodics */
2914 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2915 static void noinline ecb_cold
2916 periodics_reschedule (EV_P)
2917 {
2918 int i;
2919
2920 /* adjust periodics after time jump */
2921 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2922 {
2923 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2924
2925 if (w->reschedule_cb)
2926 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2927 else if (w->interval)
2928 periodic_recalc (EV_A_ w);
2929
2930 ANHE_at_cache (periodics [i]);
2931 }
2932
2933 reheap (periodics, periodiccnt);
2934 }
2935 #endif
2936
2937 /* adjust all timers by a given offset */
2938 static void noinline ecb_cold
2939 timers_reschedule (EV_P_ ev_tstamp adjust)
2940 {
2941 int i;
2942
2943 for (i = 0; i < timercnt; ++i)
2944 {
2945 ANHE *he = timers + i + HEAP0;
2946 ANHE_w (*he)->at += adjust;
2947 ANHE_at_cache (*he);
2948 }
2949 }
2950
2951 /* fetch new monotonic and realtime times from the kernel */
2952 /* also detect if there was a timejump, and act accordingly */
2953 inline_speed void
2954 time_update (EV_P_ ev_tstamp max_block)
2955 {
2956 #if EV_USE_MONOTONIC
2957 if (expect_true (have_monotonic))
2958 {
2959 int i;
2960 ev_tstamp odiff = rtmn_diff;
2961
2962 mn_now = get_clock ();
2963
2964 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2965 /* interpolate in the meantime */
2966 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2967 {
2968 ev_rt_now = rtmn_diff + mn_now;
2969 return;
2970 }
2971
2972 now_floor = mn_now;
2973 ev_rt_now = ev_time ();
2974
2975 /* loop a few times, before making important decisions.
2976 * on the choice of "4": one iteration isn't enough,
2977 * in case we get preempted during the calls to
2978 * ev_time and get_clock. a second call is almost guaranteed
2979 * to succeed in that case, though. and looping a few more times
2980 * doesn't hurt either as we only do this on time-jumps or
2981 * in the unlikely event of having been preempted here.
2982 */
2983 for (i = 4; --i; )
2984 {
2985 ev_tstamp diff;
2986 rtmn_diff = ev_rt_now - mn_now;
2987
2988 diff = odiff - rtmn_diff;
2989
2990 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2991 return; /* all is well */
2992
2993 ev_rt_now = ev_time ();
2994 mn_now = get_clock ();
2995 now_floor = mn_now;
2996 }
2997
2998 /* no timer adjustment, as the monotonic clock doesn't jump */
2999 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
3000 # if EV_PERIODIC_ENABLE
3001 periodics_reschedule (EV_A);
3002 # endif
3003 }
3004 else
3005 #endif
3006 {
3007 ev_rt_now = ev_time ();
3008
3009 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
3010 {
3011 /* adjust timers. this is easy, as the offset is the same for all of them */
3012 timers_reschedule (EV_A_ ev_rt_now - mn_now);
3013 #if EV_PERIODIC_ENABLE
3014 periodics_reschedule (EV_A);
3015 #endif
3016 }
3017
3018 mn_now = ev_rt_now;
3019 }
3020 }
3021
3022 int
3023 ev_run (EV_P_ int flags)
3024 {
3025 #if EV_FEATURE_API
3026 ++loop_depth;
3027 #endif
3028
3029 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
3030
3031 loop_done = EVBREAK_CANCEL;
3032
3033 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
3034
3035 do
3036 {
3037 #if EV_VERIFY >= 2
3038 ev_verify (EV_A);
3039 #endif
3040
3041 #ifndef _WIN32
3042 if (expect_false (curpid)) /* penalise the forking check even more */
3043 if (expect_false (getpid () != curpid))
3044 {
3045 curpid = getpid ();
3046 postfork = 1;
3047 }
3048 #endif
3049
3050 #if EV_FORK_ENABLE
3051 /* we might have forked, so queue fork handlers */
3052 if (expect_false (postfork))
3053 if (forkcnt)
3054 {
3055 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
3056 EV_INVOKE_PENDING;
3057 }
3058 #endif
3059
3060 #if EV_PREPARE_ENABLE
3061 /* queue prepare watchers (and execute them) */
3062 if (expect_false (preparecnt))
3063 {
3064 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
3065 EV_INVOKE_PENDING;
3066 }
3067 #endif
3068
3069 if (expect_false (loop_done))
3070 break;
3071
3072 /* we might have forked, so reify kernel state if necessary */
3073 if (expect_false (postfork))
3074 loop_fork (EV_A);
3075
3076 /* update fd-related kernel structures */
3077 fd_reify (EV_A);
3078
3079 /* calculate blocking time */
3080 {
3081 ev_tstamp waittime = 0.;
3082 ev_tstamp sleeptime = 0.;
3083
3084 /* remember old timestamp for io_blocktime calculation */
3085 ev_tstamp prev_mn_now = mn_now;
3086
3087 /* update time to cancel out callback processing overhead */
3088 time_update (EV_A_ 1e100);
3089
3090 /* from now on, we want a pipe-wake-up */
3091 pipe_write_wanted = 1;
3092
3093 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3094
3095 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3096 {
3097 waittime = MAX_BLOCKTIME;
3098
3099 if (timercnt)
3100 {
3101 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3102 if (waittime > to) waittime = to;
3103 }
3104
3105 #if EV_PERIODIC_ENABLE
3106 if (periodiccnt)
3107 {
3108 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3109 if (waittime > to) waittime = to;
3110 }
3111 #endif
3112
3113 /* don't let timeouts decrease the waittime below timeout_blocktime */
3114 if (expect_false (waittime < timeout_blocktime))
3115 waittime = timeout_blocktime;
3116
3117 /* at this point, we NEED to wait, so we have to ensure */
3118 /* to pass a minimum nonzero value to the backend */
3119 if (expect_false (waittime < backend_mintime))
3120 waittime = backend_mintime;
3121
3122 /* extra check because io_blocktime is commonly 0 */
3123 if (expect_false (io_blocktime))
3124 {
3125 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3126
3127 if (sleeptime > waittime - backend_mintime)
3128 sleeptime = waittime - backend_mintime;
3129
3130 if (expect_true (sleeptime > 0.))
3131 {
3132 ev_sleep (sleeptime);
3133 waittime -= sleeptime;
3134 }
3135 }
3136 }
3137
3138 #if EV_FEATURE_API
3139 ++loop_count;
3140 #endif
3141 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3142 backend_poll (EV_A_ waittime);
3143 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3144
3145 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3146
3147 ECB_MEMORY_FENCE_ACQUIRE;
3148 if (pipe_write_skipped)
3149 {
3150 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3151 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3152 }
3153
3154
3155 /* update ev_rt_now, do magic */
3156 time_update (EV_A_ waittime + sleeptime);
3157 }
3158
3159 /* queue pending timers and reschedule them */
3160 timers_reify (EV_A); /* relative timers called last */
3161 #if EV_PERIODIC_ENABLE
3162 periodics_reify (EV_A); /* absolute timers called first */
3163 #endif
3164
3165 #if EV_IDLE_ENABLE
3166 /* queue idle watchers unless other events are pending */
3167 idle_reify (EV_A);
3168 #endif
3169
3170 #if EV_CHECK_ENABLE
3171 /* queue check watchers, to be executed first */
3172 if (expect_false (checkcnt))
3173 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3174 #endif
3175
3176 EV_INVOKE_PENDING;
3177 }
3178 while (expect_true (
3179 activecnt
3180 && !loop_done
3181 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3182 ));
3183
3184 if (loop_done == EVBREAK_ONE)
3185 loop_done = EVBREAK_CANCEL;
3186
3187 #if EV_FEATURE_API
3188 --loop_depth;
3189 #endif
3190
3191 return activecnt;
3192 }
3193
3194 void
3195 ev_break (EV_P_ int how) EV_THROW
3196 {
3197 loop_done = how;
3198 }
3199
3200 void
3201 ev_ref (EV_P) EV_THROW
3202 {
3203 ++activecnt;
3204 }
3205
3206 void
3207 ev_unref (EV_P) EV_THROW
3208 {
3209 --activecnt;
3210 }
3211
3212 void
3213 ev_now_update (EV_P) EV_THROW
3214 {
3215 time_update (EV_A_ 1e100);
3216 }
3217
3218 void
3219 ev_suspend (EV_P) EV_THROW
3220 {
3221 ev_now_update (EV_A);
3222 }
3223
3224 void
3225 ev_resume (EV_P) EV_THROW
3226 {
3227 ev_tstamp mn_prev = mn_now;
3228
3229 ev_now_update (EV_A);
3230 timers_reschedule (EV_A_ mn_now - mn_prev);
3231 #if EV_PERIODIC_ENABLE
3232 /* TODO: really do this? */
3233 periodics_reschedule (EV_A);
3234 #endif
3235 }
3236
3237 /*****************************************************************************/
3238 /* singly-linked list management, used when the expected list length is short */
3239
3240 inline_size void
3241 wlist_add (WL *head, WL elem)
3242 {
3243 elem->next = *head;
3244 *head = elem;
3245 }
3246
3247 inline_size void
3248 wlist_del (WL *head, WL elem)
3249 {
3250 while (*head)
3251 {
3252 if (expect_true (*head == elem))
3253 {
3254 *head = elem->next;
3255 break;
3256 }
3257
3258 head = &(*head)->next;
3259 }
3260 }
3261
3262 /* internal, faster, version of ev_clear_pending */
3263 inline_speed void
3264 clear_pending (EV_P_ W w)
3265 {
3266 if (w->pending)
3267 {
3268 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3269 w->pending = 0;
3270 }
3271 }
3272
3273 int
3274 ev_clear_pending (EV_P_ void *w) EV_THROW
3275 {
3276 W w_ = (W)w;
3277 int pending = w_->pending;
3278
3279 if (expect_true (pending))
3280 {
3281 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3282 p->w = (W)&pending_w;
3283 w_->pending = 0;
3284 return p->events;
3285 }
3286 else
3287 return 0;
3288 }
3289
3290 inline_size void
3291 pri_adjust (EV_P_ W w)
3292 {
3293 int pri = ev_priority (w);
3294 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3295 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3296 ev_set_priority (w, pri);
3297 }
3298
3299 inline_speed void
3300 ev_start (EV_P_ W w, int active)
3301 {
3302 pri_adjust (EV_A_ w);
3303 w->active = active;
3304 ev_ref (EV_A);
3305 }
3306
3307 inline_size void
3308 ev_stop (EV_P_ W w)
3309 {
3310 ev_unref (EV_A);
3311 w->active = 0;
3312 }
3313
3314 /*****************************************************************************/
3315
3316 void noinline
3317 ev_io_start (EV_P_ ev_io *w) EV_THROW
3318 {
3319 int fd = w->fd;
3320
3321 if (expect_false (ev_is_active (w)))
3322 return;
3323
3324 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3325 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3326
3327 EV_FREQUENT_CHECK;
3328
3329 ev_start (EV_A_ (W)w, 1);
3330 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3331 wlist_add (&anfds[fd].head, (WL)w);
3332
3333 /* common bug, apparently */
3334 assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
3335
3336 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3337 w->events &= ~EV__IOFDSET;
3338
3339 EV_FREQUENT_CHECK;
3340 }
3341
3342 void noinline
3343 ev_io_stop (EV_P_ ev_io *w) EV_THROW
3344 {
3345 clear_pending (EV_A_ (W)w);
3346 if (expect_false (!ev_is_active (w)))
3347 return;
3348
3349 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3350
3351 EV_FREQUENT_CHECK;
3352
3353 wlist_del (&anfds[w->fd].head, (WL)w);
3354 ev_stop (EV_A_ (W)w);
3355
3356 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3357
3358 EV_FREQUENT_CHECK;
3359 }
3360
3361 void noinline
3362 ev_timer_start (EV_P_ ev_timer *w) EV_THROW
3363 {
3364 if (expect_false (ev_is_active (w)))
3365 return;
3366
3367 ev_at (w) += mn_now;
3368
3369 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3370
3371 EV_FREQUENT_CHECK;
3372
3373 ++timercnt;
3374 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3375 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3376 ANHE_w (timers [ev_active (w)]) = (WT)w;
3377 ANHE_at_cache (timers [ev_active (w)]);
3378 upheap (timers, ev_active (w));
3379
3380 EV_FREQUENT_CHECK;
3381
3382 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3383 }
3384
3385 void noinline
3386 ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
3387 {
3388 clear_pending (EV_A_ (W)w);
3389 if (expect_false (!ev_is_active (w)))
3390 return;
3391
3392 EV_FREQUENT_CHECK;
3393
3394 {
3395 int active = ev_active (w);
3396
3397 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3398
3399 --timercnt;
3400
3401 if (expect_true (active < timercnt + HEAP0))
3402 {
3403 timers [active] = timers [timercnt + HEAP0];
3404 adjustheap (timers, timercnt, active);
3405 }
3406 }
3407
3408 ev_at (w) -= mn_now;
3409
3410 ev_stop (EV_A_ (W)w);
3411
3412 EV_FREQUENT_CHECK;
3413 }
3414
3415 void noinline
3416 ev_timer_again (EV_P_ ev_timer *w) EV_THROW
3417 {
3418 EV_FREQUENT_CHECK;
3419
3420 clear_pending (EV_A_ (W)w);
3421
3422 if (ev_is_active (w))
3423 {
3424 if (w->repeat)
3425 {
3426 ev_at (w) = mn_now + w->repeat;
3427 ANHE_at_cache (timers [ev_active (w)]);
3428 adjustheap (timers, timercnt, ev_active (w));
3429 }
3430 else
3431 ev_timer_stop (EV_A_ w);
3432 }
3433 else if (w->repeat)
3434 {
3435 ev_at (w) = w->repeat;
3436 ev_timer_start (EV_A_ w);
3437 }
3438
3439 EV_FREQUENT_CHECK;
3440 }
3441
3442 ev_tstamp
3443 ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
3444 {
3445 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3446 }
3447
3448 #if EV_PERIODIC_ENABLE
3449 void noinline
3450 ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
3451 {
3452 if (expect_false (ev_is_active (w)))
3453 return;
3454
3455 if (w->reschedule_cb)
3456 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3457 else if (w->interval)
3458 {
3459 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3460 periodic_recalc (EV_A_ w);
3461 }
3462 else
3463 ev_at (w) = w->offset;
3464
3465 EV_FREQUENT_CHECK;
3466
3467 ++periodiccnt;
3468 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3469 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3470 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3471 ANHE_at_cache (periodics [ev_active (w)]);
3472 upheap (periodics, ev_active (w));
3473
3474 EV_FREQUENT_CHECK;
3475
3476 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3477 }
3478
3479 void noinline
3480 ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
3481 {
3482 clear_pending (EV_A_ (W)w);
3483 if (expect_false (!ev_is_active (w)))
3484 return;
3485
3486 EV_FREQUENT_CHECK;
3487
3488 {
3489 int active = ev_active (w);
3490
3491 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3492
3493 --periodiccnt;
3494
3495 if (expect_true (active < periodiccnt + HEAP0))
3496 {
3497 periodics [active] = periodics [periodiccnt + HEAP0];
3498 adjustheap (periodics, periodiccnt, active);
3499 }
3500 }
3501
3502 ev_stop (EV_A_ (W)w);
3503
3504 EV_FREQUENT_CHECK;
3505 }
3506
3507 void noinline
3508 ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
3509 {
3510 /* TODO: use adjustheap and recalculation */
3511 ev_periodic_stop (EV_A_ w);
3512 ev_periodic_start (EV_A_ w);
3513 }
3514 #endif
3515
3516 #ifndef SA_RESTART
3517 # define SA_RESTART 0
3518 #endif
3519
3520 #if EV_SIGNAL_ENABLE
3521
3522 void noinline
3523 ev_signal_start (EV_P_ ev_signal *w) EV_THROW
3524 {
3525 if (expect_false (ev_is_active (w)))
3526 return;
3527
3528 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3529
3530 #if EV_MULTIPLICITY
3531 assert (("libev: a signal must not be attached to two different loops",
3532 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3533
3534 signals [w->signum - 1].loop = EV_A;
3535 #endif
3536
3537 EV_FREQUENT_CHECK;
3538
3539 #if EV_USE_SIGNALFD
3540 if (sigfd == -2)
3541 {
3542 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3543 if (sigfd < 0 && errno == EINVAL)
3544 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3545
3546 if (sigfd >= 0)
3547 {
3548 fd_intern (sigfd); /* doing it twice will not hurt */
3549
3550 sigemptyset (&sigfd_set);
3551
3552 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3553 ev_set_priority (&sigfd_w, EV_MAXPRI);
3554 ev_io_start (EV_A_ &sigfd_w);
3555 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3556 }
3557 }
3558
3559 if (sigfd >= 0)
3560 {
3561 /* TODO: check .head */
3562 sigaddset (&sigfd_set, w->signum);
3563 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3564
3565 signalfd (sigfd, &sigfd_set, 0);
3566 }
3567 #endif
3568
3569 ev_start (EV_A_ (W)w, 1);
3570 wlist_add (&signals [w->signum - 1].head, (WL)w);
3571
3572 if (!((WL)w)->next)
3573 # if EV_USE_SIGNALFD
3574 if (sigfd < 0) /*TODO*/
3575 # endif
3576 {
3577 # ifdef _WIN32
3578 evpipe_init (EV_A);
3579
3580 signal (w->signum, ev_sighandler);
3581 # else
3582 struct sigaction sa;
3583
3584 evpipe_init (EV_A);
3585
3586 sa.sa_handler = ev_sighandler;
3587 sigfillset (&sa.sa_mask);
3588 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3589 sigaction (w->signum, &sa, 0);
3590
3591 if (origflags & EVFLAG_NOSIGMASK)
3592 {
3593 sigemptyset (&sa.sa_mask);
3594 sigaddset (&sa.sa_mask, w->signum);
3595 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3596 }
3597 #endif
3598 }
3599
3600 EV_FREQUENT_CHECK;
3601 }
3602
3603 void noinline
3604 ev_signal_stop (EV_P_ ev_signal *w) EV_THROW
3605 {
3606 clear_pending (EV_A_ (W)w);
3607 if (expect_false (!ev_is_active (w)))
3608 return;
3609
3610 EV_FREQUENT_CHECK;
3611
3612 wlist_del (&signals [w->signum - 1].head, (WL)w);
3613 ev_stop (EV_A_ (W)w);
3614
3615 if (!signals [w->signum - 1].head)
3616 {
3617 #if EV_MULTIPLICITY
3618 signals [w->signum - 1].loop = 0; /* unattach from signal */
3619 #endif
3620 #if EV_USE_SIGNALFD
3621 if (sigfd >= 0)
3622 {
3623 sigset_t ss;
3624
3625 sigemptyset (&ss);
3626 sigaddset (&ss, w->signum);
3627 sigdelset (&sigfd_set, w->signum);
3628
3629 signalfd (sigfd, &sigfd_set, 0);
3630 sigprocmask (SIG_UNBLOCK, &ss, 0);
3631 }
3632 else
3633 #endif
3634 signal (w->signum, SIG_DFL);
3635 }
3636
3637 EV_FREQUENT_CHECK;
3638 }
3639
3640 #endif
3641
3642 #if EV_CHILD_ENABLE
3643
3644 void
3645 ev_child_start (EV_P_ ev_child *w) EV_THROW
3646 {
3647 #if EV_MULTIPLICITY
3648 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3649 #endif
3650 if (expect_false (ev_is_active (w)))
3651 return;
3652
3653 EV_FREQUENT_CHECK;
3654
3655 ev_start (EV_A_ (W)w, 1);
3656 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3657
3658 EV_FREQUENT_CHECK;
3659 }
3660
3661 void
3662 ev_child_stop (EV_P_ ev_child *w) EV_THROW
3663 {
3664 clear_pending (EV_A_ (W)w);
3665 if (expect_false (!ev_is_active (w)))
3666 return;
3667
3668 EV_FREQUENT_CHECK;
3669
3670 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3671 ev_stop (EV_A_ (W)w);
3672
3673 EV_FREQUENT_CHECK;
3674 }
3675
3676 #endif
3677
3678 #if EV_STAT_ENABLE
3679
3680 # ifdef _WIN32
3681 # undef lstat
3682 # define lstat(a,b) _stati64 (a,b)
3683 # endif
3684
3685 #define DEF_STAT_INTERVAL 5.0074891
3686 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3687 #define MIN_STAT_INTERVAL 0.1074891
3688
3689 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3690
3691 #if EV_USE_INOTIFY
3692
3693 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3694 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3695
3696 static void noinline
3697 infy_add (EV_P_ ev_stat *w)
3698 {
3699 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);
3700
3701 if (w->wd >= 0)
3702 {
3703 struct statfs sfs;
3704
3705 /* now local changes will be tracked by inotify, but remote changes won't */
3706 /* unless the filesystem is known to be local, we therefore still poll */
3707 /* also do poll on <2.6.25, but with normal frequency */
3708
3709 if (!fs_2625)
3710 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3711 else if (!statfs (w->path, &sfs)
3712 && (sfs.f_type == 0x1373 /* devfs */
3713 || sfs.f_type == 0xEF53 /* ext2/3 */
3714 || sfs.f_type == 0x3153464a /* jfs */
3715 || sfs.f_type == 0x52654973 /* reiser3 */
3716 || sfs.f_type == 0x01021994 /* tempfs */
3717 || sfs.f_type == 0x58465342 /* xfs */))
3718 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3719 else
3720 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3721 }
3722 else
3723 {
3724 /* can't use inotify, continue to stat */
3725 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3726
3727 /* if path is not there, monitor some parent directory for speedup hints */
3728 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3729 /* but an efficiency issue only */
3730 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3731 {
3732 char path [4096];
3733 strcpy (path, w->path);
3734
3735 do
3736 {
3737 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3738 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3739
3740 char *pend = strrchr (path, '/');
3741
3742 if (!pend || pend == path)
3743 break;
3744
3745 *pend = 0;
3746 w->wd = inotify_add_watch (fs_fd, path, mask);
3747 }
3748 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3749 }
3750 }
3751
3752 if (w->wd >= 0)
3753 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3754
3755 /* now re-arm timer, if required */
3756 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3757 ev_timer_again (EV_A_ &w->timer);
3758 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3759 }
3760
3761 static void noinline
3762 infy_del (EV_P_ ev_stat *w)
3763 {
3764 int slot;
3765 int wd = w->wd;
3766
3767 if (wd < 0)
3768 return;
3769
3770 w->wd = -2;
3771 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3772 wlist_del (&fs_hash [slot].head, (WL)w);
3773
3774 /* remove this watcher, if others are watching it, they will rearm */
3775 inotify_rm_watch (fs_fd, wd);
3776 }
3777
3778 static void noinline
3779 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3780 {
3781 if (slot < 0)
3782 /* overflow, need to check for all hash slots */
3783 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3784 infy_wd (EV_A_ slot, wd, ev);
3785 else
3786 {
3787 WL w_;
3788
3789 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3790 {
3791 ev_stat *w = (ev_stat *)w_;
3792 w_ = w_->next; /* lets us remove this watcher and all before it */
3793
3794 if (w->wd == wd || wd == -1)
3795 {
3796 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3797 {
3798 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3799 w->wd = -1;
3800 infy_add (EV_A_ w); /* re-add, no matter what */
3801 }
3802
3803 stat_timer_cb (EV_A_ &w->timer, 0);
3804 }
3805 }
3806 }
3807 }
3808
3809 static void
3810 infy_cb (EV_P_ ev_io *w, int revents)
3811 {
3812 char buf [EV_INOTIFY_BUFSIZE];
3813 int ofs;
3814 int len = read (fs_fd, buf, sizeof (buf));
3815
3816 for (ofs = 0; ofs < len; )
3817 {
3818 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3819 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3820 ofs += sizeof (struct inotify_event) + ev->len;
3821 }
3822 }
3823
3824 inline_size void ecb_cold
3825 ev_check_2625 (EV_P)
3826 {
3827 /* kernels < 2.6.25 are borked
3828 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3829 */
3830 if (ev_linux_version () < 0x020619)
3831 return;
3832
3833 fs_2625 = 1;
3834 }
3835
3836 inline_size int
3837 infy_newfd (void)
3838 {
3839 #if defined IN_CLOEXEC && defined IN_NONBLOCK
3840 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3841 if (fd >= 0)
3842 return fd;
3843 #endif
3844 return inotify_init ();
3845 }
3846
3847 inline_size void
3848 infy_init (EV_P)
3849 {
3850 if (fs_fd != -2)
3851 return;
3852
3853 fs_fd = -1;
3854
3855 ev_check_2625 (EV_A);
3856
3857 fs_fd = infy_newfd ();
3858
3859 if (fs_fd >= 0)
3860 {
3861 fd_intern (fs_fd);
3862 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3863 ev_set_priority (&fs_w, EV_MAXPRI);
3864 ev_io_start (EV_A_ &fs_w);
3865 ev_unref (EV_A);
3866 }
3867 }
3868
3869 inline_size void
3870 infy_fork (EV_P)
3871 {
3872 int slot;
3873
3874 if (fs_fd < 0)
3875 return;
3876
3877 ev_ref (EV_A);
3878 ev_io_stop (EV_A_ &fs_w);
3879 close (fs_fd);
3880 fs_fd = infy_newfd ();
3881
3882 if (fs_fd >= 0)
3883 {
3884 fd_intern (fs_fd);
3885 ev_io_set (&fs_w, fs_fd, EV_READ);
3886 ev_io_start (EV_A_ &fs_w);
3887 ev_unref (EV_A);
3888 }
3889
3890 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3891 {
3892 WL w_ = fs_hash [slot].head;
3893 fs_hash [slot].head = 0;
3894
3895 while (w_)
3896 {
3897 ev_stat *w = (ev_stat *)w_;
3898 w_ = w_->next; /* lets us add this watcher */
3899
3900 w->wd = -1;
3901
3902 if (fs_fd >= 0)
3903 infy_add (EV_A_ w); /* re-add, no matter what */
3904 else
3905 {
3906 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3907 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3908 ev_timer_again (EV_A_ &w->timer);
3909 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3910 }
3911 }
3912 }
3913 }
3914
3915 #endif
3916
3917 #ifdef _WIN32
3918 # define EV_LSTAT(p,b) _stati64 (p, b)
3919 #else
3920 # define EV_LSTAT(p,b) lstat (p, b)
3921 #endif
3922
3923 void
3924 ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
3925 {
3926 if (lstat (w->path, &w->attr) < 0)
3927 w->attr.st_nlink = 0;
3928 else if (!w->attr.st_nlink)
3929 w->attr.st_nlink = 1;
3930 }
3931
3932 static void noinline
3933 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3934 {
3935 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3936
3937 ev_statdata prev = w->attr;
3938 ev_stat_stat (EV_A_ w);
3939
3940 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3941 if (
3942 prev.st_dev != w->attr.st_dev
3943 || prev.st_ino != w->attr.st_ino
3944 || prev.st_mode != w->attr.st_mode
3945 || prev.st_nlink != w->attr.st_nlink
3946 || prev.st_uid != w->attr.st_uid
3947 || prev.st_gid != w->attr.st_gid
3948 || prev.st_rdev != w->attr.st_rdev
3949 || prev.st_size != w->attr.st_size
3950 || prev.st_atime != w->attr.st_atime
3951 || prev.st_mtime != w->attr.st_mtime
3952 || prev.st_ctime != w->attr.st_ctime
3953 ) {
3954 /* we only update w->prev on actual differences */
3955 /* in case we test more often than invoke the callback, */
3956 /* to ensure that prev is always different to attr */
3957 w->prev = prev;
3958
3959 #if EV_USE_INOTIFY
3960 if (fs_fd >= 0)
3961 {
3962 infy_del (EV_A_ w);
3963 infy_add (EV_A_ w);
3964 ev_stat_stat (EV_A_ w); /* avoid race... */
3965 }
3966 #endif
3967
3968 ev_feed_event (EV_A_ w, EV_STAT);
3969 }
3970 }
3971
3972 void
3973 ev_stat_start (EV_P_ ev_stat *w) EV_THROW
3974 {
3975 if (expect_false (ev_is_active (w)))
3976 return;
3977
3978 ev_stat_stat (EV_A_ w);
3979
3980 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3981 w->interval = MIN_STAT_INTERVAL;
3982
3983 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3984 ev_set_priority (&w->timer, ev_priority (w));
3985
3986 #if EV_USE_INOTIFY
3987 infy_init (EV_A);
3988
3989 if (fs_fd >= 0)
3990 infy_add (EV_A_ w);
3991 else
3992 #endif
3993 {
3994 ev_timer_again (EV_A_ &w->timer);
3995 ev_unref (EV_A);
3996 }
3997
3998 ev_start (EV_A_ (W)w, 1);
3999
4000 EV_FREQUENT_CHECK;
4001 }
4002
4003 void
4004 ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
4005 {
4006 clear_pending (EV_A_ (W)w);
4007 if (expect_false (!ev_is_active (w)))
4008 return;
4009
4010 EV_FREQUENT_CHECK;
4011
4012 #if EV_USE_INOTIFY
4013 infy_del (EV_A_ w);
4014 #endif
4015
4016 if (ev_is_active (&w->timer))
4017 {
4018 ev_ref (EV_A);
4019 ev_timer_stop (EV_A_ &w->timer);
4020 }
4021
4022 ev_stop (EV_A_ (W)w);
4023
4024 EV_FREQUENT_CHECK;
4025 }
4026 #endif
4027
4028 #if EV_IDLE_ENABLE
4029 void
4030 ev_idle_start (EV_P_ ev_idle *w) EV_THROW
4031 {
4032 if (expect_false (ev_is_active (w)))
4033 return;
4034
4035 pri_adjust (EV_A_ (W)w);
4036
4037 EV_FREQUENT_CHECK;
4038
4039 {
4040 int active = ++idlecnt [ABSPRI (w)];
4041
4042 ++idleall;
4043 ev_start (EV_A_ (W)w, active);
4044
4045 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
4046 idles [ABSPRI (w)][active - 1] = w;
4047 }
4048
4049 EV_FREQUENT_CHECK;
4050 }
4051
4052 void
4053 ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
4054 {
4055 clear_pending (EV_A_ (W)w);
4056 if (expect_false (!ev_is_active (w)))
4057 return;
4058
4059 EV_FREQUENT_CHECK;
4060
4061 {
4062 int active = ev_active (w);
4063
4064 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
4065 ev_active (idles [ABSPRI (w)][active - 1]) = active;
4066
4067 ev_stop (EV_A_ (W)w);
4068 --idleall;
4069 }
4070
4071 EV_FREQUENT_CHECK;
4072 }
4073 #endif
4074
4075 #if EV_PREPARE_ENABLE
4076 void
4077 ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
4078 {
4079 if (expect_false (ev_is_active (w)))
4080 return;
4081
4082 EV_FREQUENT_CHECK;
4083
4084 ev_start (EV_A_ (W)w, ++preparecnt);
4085 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
4086 prepares [preparecnt - 1] = w;
4087
4088 EV_FREQUENT_CHECK;
4089 }
4090
4091 void
4092 ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
4093 {
4094 clear_pending (EV_A_ (W)w);
4095 if (expect_false (!ev_is_active (w)))
4096 return;
4097
4098 EV_FREQUENT_CHECK;
4099
4100 {
4101 int active = ev_active (w);
4102
4103 prepares [active - 1] = prepares [--preparecnt];
4104 ev_active (prepares [active - 1]) = active;
4105 }
4106
4107 ev_stop (EV_A_ (W)w);
4108
4109 EV_FREQUENT_CHECK;
4110 }
4111 #endif
4112
4113 #if EV_CHECK_ENABLE
4114 void
4115 ev_check_start (EV_P_ ev_check *w) EV_THROW
4116 {
4117 if (expect_false (ev_is_active (w)))
4118 return;
4119
4120 EV_FREQUENT_CHECK;
4121
4122 ev_start (EV_A_ (W)w, ++checkcnt);
4123 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4124 checks [checkcnt - 1] = w;
4125
4126 EV_FREQUENT_CHECK;
4127 }
4128
4129 void
4130 ev_check_stop (EV_P_ ev_check *w) EV_THROW
4131 {
4132 clear_pending (EV_A_ (W)w);
4133 if (expect_false (!ev_is_active (w)))
4134 return;
4135
4136 EV_FREQUENT_CHECK;
4137
4138 {
4139 int active = ev_active (w);
4140
4141 checks [active - 1] = checks [--checkcnt];
4142 ev_active (checks [active - 1]) = active;
4143 }
4144
4145 ev_stop (EV_A_ (W)w);
4146
4147 EV_FREQUENT_CHECK;
4148 }
4149 #endif
4150
4151 #if EV_EMBED_ENABLE
4152 void noinline
4153 ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
4154 {
4155 ev_run (w->other, EVRUN_NOWAIT);
4156 }
4157
4158 static void
4159 embed_io_cb (EV_P_ ev_io *io, int revents)
4160 {
4161 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4162
4163 if (ev_cb (w))
4164 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4165 else
4166 ev_run (w->other, EVRUN_NOWAIT);
4167 }
4168
4169 static void
4170 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4171 {
4172 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4173
4174 {
4175 EV_P = w->other;
4176
4177 while (fdchangecnt)
4178 {
4179 fd_reify (EV_A);
4180 ev_run (EV_A_ EVRUN_NOWAIT);
4181 }
4182 }
4183 }
4184
4185 static void
4186 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4187 {
4188 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4189
4190 ev_embed_stop (EV_A_ w);
4191
4192 {
4193 EV_P = w->other;
4194
4195 ev_loop_fork (EV_A);
4196 ev_run (EV_A_ EVRUN_NOWAIT);
4197 }
4198
4199 ev_embed_start (EV_A_ w);
4200 }
4201
4202 #if 0
4203 static void
4204 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4205 {
4206 ev_idle_stop (EV_A_ idle);
4207 }
4208 #endif
4209
4210 void
4211 ev_embed_start (EV_P_ ev_embed *w) EV_THROW
4212 {
4213 if (expect_false (ev_is_active (w)))
4214 return;
4215
4216 {
4217 EV_P = w->other;
4218 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4219 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4220 }
4221
4222 EV_FREQUENT_CHECK;
4223
4224 ev_set_priority (&w->io, ev_priority (w));
4225 ev_io_start (EV_A_ &w->io);
4226
4227 ev_prepare_init (&w->prepare, embed_prepare_cb);
4228 ev_set_priority (&w->prepare, EV_MINPRI);
4229 ev_prepare_start (EV_A_ &w->prepare);
4230
4231 ev_fork_init (&w->fork, embed_fork_cb);
4232 ev_fork_start (EV_A_ &w->fork);
4233
4234 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4235
4236 ev_start (EV_A_ (W)w, 1);
4237
4238 EV_FREQUENT_CHECK;
4239 }
4240
4241 void
4242 ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
4243 {
4244 clear_pending (EV_A_ (W)w);
4245 if (expect_false (!ev_is_active (w)))
4246 return;
4247
4248 EV_FREQUENT_CHECK;
4249
4250 ev_io_stop (EV_A_ &w->io);
4251 ev_prepare_stop (EV_A_ &w->prepare);
4252 ev_fork_stop (EV_A_ &w->fork);
4253
4254 ev_stop (EV_A_ (W)w);
4255
4256 EV_FREQUENT_CHECK;
4257 }
4258 #endif
4259
4260 #if EV_FORK_ENABLE
4261 void
4262 ev_fork_start (EV_P_ ev_fork *w) EV_THROW
4263 {
4264 if (expect_false (ev_is_active (w)))
4265 return;
4266
4267 EV_FREQUENT_CHECK;
4268
4269 ev_start (EV_A_ (W)w, ++forkcnt);
4270 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4271 forks [forkcnt - 1] = w;
4272
4273 EV_FREQUENT_CHECK;
4274 }
4275
4276 void
4277 ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
4278 {
4279 clear_pending (EV_A_ (W)w);
4280 if (expect_false (!ev_is_active (w)))
4281 return;
4282
4283 EV_FREQUENT_CHECK;
4284
4285 {
4286 int active = ev_active (w);
4287
4288 forks [active - 1] = forks [--forkcnt];
4289 ev_active (forks [active - 1]) = active;
4290 }
4291
4292 ev_stop (EV_A_ (W)w);
4293
4294 EV_FREQUENT_CHECK;
4295 }
4296 #endif
4297
4298 #if EV_CLEANUP_ENABLE
4299 void
4300 ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
4301 {
4302 if (expect_false (ev_is_active (w)))
4303 return;
4304
4305 EV_FREQUENT_CHECK;
4306
4307 ev_start (EV_A_ (W)w, ++cleanupcnt);
4308 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4309 cleanups [cleanupcnt - 1] = w;
4310
4311 /* cleanup watchers should never keep a refcount on the loop */
4312 ev_unref (EV_A);
4313 EV_FREQUENT_CHECK;
4314 }
4315
4316 void
4317 ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
4318 {
4319 clear_pending (EV_A_ (W)w);
4320 if (expect_false (!ev_is_active (w)))
4321 return;
4322
4323 EV_FREQUENT_CHECK;
4324 ev_ref (EV_A);
4325
4326 {
4327 int active = ev_active (w);
4328
4329 cleanups [active - 1] = cleanups [--cleanupcnt];
4330 ev_active (cleanups [active - 1]) = active;
4331 }
4332
4333 ev_stop (EV_A_ (W)w);
4334
4335 EV_FREQUENT_CHECK;
4336 }
4337 #endif
4338
4339 #if EV_ASYNC_ENABLE
4340 void
4341 ev_async_start (EV_P_ ev_async *w) EV_THROW
4342 {
4343 if (expect_false (ev_is_active (w)))
4344 return;
4345
4346 w->sent = 0;
4347
4348 evpipe_init (EV_A);
4349
4350 EV_FREQUENT_CHECK;
4351
4352 ev_start (EV_A_ (W)w, ++asynccnt);
4353 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4354 asyncs [asynccnt - 1] = w;
4355
4356 EV_FREQUENT_CHECK;
4357 }
4358
4359 void
4360 ev_async_stop (EV_P_ ev_async *w) EV_THROW
4361 {
4362 clear_pending (EV_A_ (W)w);
4363 if (expect_false (!ev_is_active (w)))
4364 return;
4365
4366 EV_FREQUENT_CHECK;
4367
4368 {
4369 int active = ev_active (w);
4370
4371 asyncs [active - 1] = asyncs [--asynccnt];
4372 ev_active (asyncs [active - 1]) = active;
4373 }
4374
4375 ev_stop (EV_A_ (W)w);
4376
4377 EV_FREQUENT_CHECK;
4378 }
4379
4380 void
4381 ev_async_send (EV_P_ ev_async *w) EV_THROW
4382 {
4383 w->sent = 1;
4384 evpipe_write (EV_A_ &async_pending);
4385 }
4386 #endif
4387
4388 /*****************************************************************************/
4389
4390 struct ev_once
4391 {
4392 ev_io io;
4393 ev_timer to;
4394 void (*cb)(int revents, void *arg);
4395 void *arg;
4396 };
4397
4398 static void
4399 once_cb (EV_P_ struct ev_once *once, int revents)
4400 {
4401 void (*cb)(int revents, void *arg) = once->cb;
4402 void *arg = once->arg;
4403
4404 ev_io_stop (EV_A_ &once->io);
4405 ev_timer_stop (EV_A_ &once->to);
4406 ev_free (once);
4407
4408 cb (revents, arg);
4409 }
4410
4411 static void
4412 once_cb_io (EV_P_ ev_io *w, int revents)
4413 {
4414 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4415
4416 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4417 }
4418
4419 static void
4420 once_cb_to (EV_P_ ev_timer *w, int revents)
4421 {
4422 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4423
4424 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4425 }
4426
4427 void
4428 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
4429 {
4430 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4431
4432 if (expect_false (!once))
4433 {
4434 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4435 return;
4436 }
4437
4438 once->cb = cb;
4439 once->arg = arg;
4440
4441 ev_init (&once->io, once_cb_io);
4442 if (fd >= 0)
4443 {
4444 ev_io_set (&once->io, fd, events);
4445 ev_io_start (EV_A_ &once->io);
4446 }
4447
4448 ev_init (&once->to, once_cb_to);
4449 if (timeout >= 0.)
4450 {
4451 ev_timer_set (&once->to, timeout, 0.);
4452 ev_timer_start (EV_A_ &once->to);
4453 }
4454 }
4455
4456 /*****************************************************************************/
4457
4458 #if EV_WALK_ENABLE
4459 void ecb_cold
4460 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
4461 {
4462 int i, j;
4463 ev_watcher_list *wl, *wn;
4464
4465 if (types & (EV_IO | EV_EMBED))
4466 for (i = 0; i < anfdmax; ++i)
4467 for (wl = anfds [i].head; wl; )
4468 {
4469 wn = wl->next;
4470
4471 #if EV_EMBED_ENABLE
4472 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4473 {
4474 if (types & EV_EMBED)
4475 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4476 }
4477 else
4478 #endif
4479 #if EV_USE_INOTIFY
4480 if (ev_cb ((ev_io *)wl) == infy_cb)
4481 ;
4482 else
4483 #endif
4484 if ((ev_io *)wl != &pipe_w)
4485 if (types & EV_IO)
4486 cb (EV_A_ EV_IO, wl);
4487
4488 wl = wn;
4489 }
4490
4491 if (types & (EV_TIMER | EV_STAT))
4492 for (i = timercnt + HEAP0; i-- > HEAP0; )
4493 #if EV_STAT_ENABLE
4494 /*TODO: timer is not always active*/
4495 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
4496 {
4497 if (types & EV_STAT)
4498 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
4499 }
4500 else
4501 #endif
4502 if (types & EV_TIMER)
4503 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
4504
4505 #if EV_PERIODIC_ENABLE
4506 if (types & EV_PERIODIC)
4507 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4508 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4509 #endif
4510
4511 #if EV_IDLE_ENABLE
4512 if (types & EV_IDLE)
4513 for (j = NUMPRI; j--; )
4514 for (i = idlecnt [j]; i--; )
4515 cb (EV_A_ EV_IDLE, idles [j][i]);
4516 #endif
4517
4518 #if EV_FORK_ENABLE
4519 if (types & EV_FORK)
4520 for (i = forkcnt; i--; )
4521 if (ev_cb (forks [i]) != embed_fork_cb)
4522 cb (EV_A_ EV_FORK, forks [i]);
4523 #endif
4524
4525 #if EV_ASYNC_ENABLE
4526 if (types & EV_ASYNC)
4527 for (i = asynccnt; i--; )
4528 cb (EV_A_ EV_ASYNC, asyncs [i]);
4529 #endif
4530
4531 #if EV_PREPARE_ENABLE
4532 if (types & EV_PREPARE)
4533 for (i = preparecnt; i--; )
4534 # if EV_EMBED_ENABLE
4535 if (ev_cb (prepares [i]) != embed_prepare_cb)
4536 # endif
4537 cb (EV_A_ EV_PREPARE, prepares [i]);
4538 #endif
4539
4540 #if EV_CHECK_ENABLE
4541 if (types & EV_CHECK)
4542 for (i = checkcnt; i--; )
4543 cb (EV_A_ EV_CHECK, checks [i]);
4544 #endif
4545
4546 #if EV_SIGNAL_ENABLE
4547 if (types & EV_SIGNAL)
4548 for (i = 0; i < EV_NSIG - 1; ++i)
4549 for (wl = signals [i].head; wl; )
4550 {
4551 wn = wl->next;
4552 cb (EV_A_ EV_SIGNAL, wl);
4553 wl = wn;
4554 }
4555 #endif
4556
4557 #if EV_CHILD_ENABLE
4558 if (types & EV_CHILD)
4559 for (i = (EV_PID_HASHSIZE); i--; )
4560 for (wl = childs [i]; wl; )
4561 {
4562 wn = wl->next;
4563 cb (EV_A_ EV_CHILD, wl);
4564 wl = wn;
4565 }
4566 #endif
4567 /* EV_STAT 0x00001000 /* stat data changed */
4568 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4569 }
4570 #endif
4571
4572 #if EV_MULTIPLICITY
4573 #include "ev_wrap.h"
4574 #endif
4575