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Revision: 1.437
Committed: Tue May 29 21:03:22 2012 UTC (12 years, 1 month ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.436: +74 -18 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_CPP98 (__cplusplus >= 199711L)
565 #define ECB_CPP11 (__cplusplus >= 201103L)
566
567 /*****************************************************************************/
568
569 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
570 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
571
572 #if ECB_NO_THREADS
573 # define ECB_NO_SMP 1
574 #endif
575
576 #if ECB_NO_SMP
577 #define ECB_MEMORY_FENCE do { } while (0)
578 #endif
579
580 #ifndef ECB_MEMORY_FENCE
581 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
582 #if __i386 || __i386__
583 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
584 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
585 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
586 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
587 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
588 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
589 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
590 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
591 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
592 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
593 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
594 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
595 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
596 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
597 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
598 #elif __sparc || __sparc__
599 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
600 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
601 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
602 #elif defined __s390__ || defined __s390x__
603 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
604 #elif defined __mips__
605 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
606 #elif defined __alpha__
607 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
608 #elif defined __hppa__
609 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
610 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
611 #elif defined __ia64__
612 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
613 #endif
614 #endif
615 #endif
616
617 #ifndef ECB_MEMORY_FENCE
618 #if ECB_GCC_VERSION(4,7)
619 /* see comment below about the C11 memory model. in short - avoid */
620 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
621 #elif defined __clang && __has_feature (cxx_atomic)
622 /* see above */
623 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
624 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
625 #define ECB_MEMORY_FENCE __sync_synchronize ()
626 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
627 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
628 #elif _MSC_VER >= 1400 /* VC++ 2005 */
629 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
630 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
631 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
632 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
633 #elif defined _WIN32
634 #include <WinNT.h>
635 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
636 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
637 #include <mbarrier.h>
638 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
639 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
640 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
641 #elif __xlC__
642 #define ECB_MEMORY_FENCE __sync ()
643 #endif
644 #endif
645
646 #ifndef ECB_MEMORY_FENCE
647 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
648 /* we assume that these memory fences work on all variables/all memory accesses, */
649 /* not just C11 atomics and atomic accesses */
650 #include <stdatomic.h>
651 /* unfortunately, the C11 memory model seems to be very limited, and unable to express */
652 /* simple barrier semantics. That means we need to take out thor's hammer. */
653 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
654 #endif
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 #if __GLIBC__
1197 return realloc (ptr, size);
1198 #else
1199 /* some systems, notably openbsd and darwin, fail to properly
1200 * implement realloc (x, 0) (as required by both ansi c-89 and
1201 * the single unix specification, so work around them here.
1202 */
1203
1204 if (size)
1205 return realloc (ptr, size);
1206
1207 free (ptr);
1208 return 0;
1209 #endif
1210 }
1211
1212 static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1213
1214 void ecb_cold
1215 ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
1216 {
1217 alloc = cb;
1218 }
1219
1220 inline_speed void *
1221 ev_realloc (void *ptr, long size)
1222 {
1223 ptr = alloc (ptr, size);
1224
1225 if (!ptr && size)
1226 {
1227 #if EV_AVOID_STDIO
1228 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1229 #else
1230 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1231 #endif
1232 abort ();
1233 }
1234
1235 return ptr;
1236 }
1237
1238 #define ev_malloc(size) ev_realloc (0, (size))
1239 #define ev_free(ptr) ev_realloc ((ptr), 0)
1240
1241 /*****************************************************************************/
1242
1243 /* set in reify when reification needed */
1244 #define EV_ANFD_REIFY 1
1245
1246 /* file descriptor info structure */
1247 typedef struct
1248 {
1249 WL head;
1250 unsigned char events; /* the events watched for */
1251 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1252 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1253 unsigned char unused;
1254 #if EV_USE_EPOLL
1255 unsigned int egen; /* generation counter to counter epoll bugs */
1256 #endif
1257 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1258 SOCKET handle;
1259 #endif
1260 #if EV_USE_IOCP
1261 OVERLAPPED or, ow;
1262 #endif
1263 } ANFD;
1264
1265 /* stores the pending event set for a given watcher */
1266 typedef struct
1267 {
1268 W w;
1269 int events; /* the pending event set for the given watcher */
1270 } ANPENDING;
1271
1272 #if EV_USE_INOTIFY
1273 /* hash table entry per inotify-id */
1274 typedef struct
1275 {
1276 WL head;
1277 } ANFS;
1278 #endif
1279
1280 /* Heap Entry */
1281 #if EV_HEAP_CACHE_AT
1282 /* a heap element */
1283 typedef struct {
1284 ev_tstamp at;
1285 WT w;
1286 } ANHE;
1287
1288 #define ANHE_w(he) (he).w /* access watcher, read-write */
1289 #define ANHE_at(he) (he).at /* access cached at, read-only */
1290 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1291 #else
1292 /* a heap element */
1293 typedef WT ANHE;
1294
1295 #define ANHE_w(he) (he)
1296 #define ANHE_at(he) (he)->at
1297 #define ANHE_at_cache(he)
1298 #endif
1299
1300 #if EV_MULTIPLICITY
1301
1302 struct ev_loop
1303 {
1304 ev_tstamp ev_rt_now;
1305 #define ev_rt_now ((loop)->ev_rt_now)
1306 #define VAR(name,decl) decl;
1307 #include "ev_vars.h"
1308 #undef VAR
1309 };
1310 #include "ev_wrap.h"
1311
1312 static struct ev_loop default_loop_struct;
1313 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1314
1315 #else
1316
1317 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1318 #define VAR(name,decl) static decl;
1319 #include "ev_vars.h"
1320 #undef VAR
1321
1322 static int ev_default_loop_ptr;
1323
1324 #endif
1325
1326 #if EV_FEATURE_API
1327 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1328 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1329 # define EV_INVOKE_PENDING invoke_cb (EV_A)
1330 #else
1331 # define EV_RELEASE_CB (void)0
1332 # define EV_ACQUIRE_CB (void)0
1333 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1334 #endif
1335
1336 #define EVBREAK_RECURSE 0x80
1337
1338 /*****************************************************************************/
1339
1340 #ifndef EV_HAVE_EV_TIME
1341 ev_tstamp
1342 ev_time (void) EV_THROW
1343 {
1344 #if EV_USE_REALTIME
1345 if (expect_true (have_realtime))
1346 {
1347 struct timespec ts;
1348 clock_gettime (CLOCK_REALTIME, &ts);
1349 return ts.tv_sec + ts.tv_nsec * 1e-9;
1350 }
1351 #endif
1352
1353 struct timeval tv;
1354 gettimeofday (&tv, 0);
1355 return tv.tv_sec + tv.tv_usec * 1e-6;
1356 }
1357 #endif
1358
1359 inline_size ev_tstamp
1360 get_clock (void)
1361 {
1362 #if EV_USE_MONOTONIC
1363 if (expect_true (have_monotonic))
1364 {
1365 struct timespec ts;
1366 clock_gettime (CLOCK_MONOTONIC, &ts);
1367 return ts.tv_sec + ts.tv_nsec * 1e-9;
1368 }
1369 #endif
1370
1371 return ev_time ();
1372 }
1373
1374 #if EV_MULTIPLICITY
1375 ev_tstamp
1376 ev_now (EV_P) EV_THROW
1377 {
1378 return ev_rt_now;
1379 }
1380 #endif
1381
1382 void
1383 ev_sleep (ev_tstamp delay) EV_THROW
1384 {
1385 if (delay > 0.)
1386 {
1387 #if EV_USE_NANOSLEEP
1388 struct timespec ts;
1389
1390 EV_TS_SET (ts, delay);
1391 nanosleep (&ts, 0);
1392 #elif defined _WIN32
1393 Sleep ((unsigned long)(delay * 1e3));
1394 #else
1395 struct timeval tv;
1396
1397 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1398 /* something not guaranteed by newer posix versions, but guaranteed */
1399 /* by older ones */
1400 EV_TV_SET (tv, delay);
1401 select (0, 0, 0, 0, &tv);
1402 #endif
1403 }
1404 }
1405
1406 /*****************************************************************************/
1407
1408 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1409
1410 /* find a suitable new size for the given array, */
1411 /* hopefully by rounding to a nice-to-malloc size */
1412 inline_size int
1413 array_nextsize (int elem, int cur, int cnt)
1414 {
1415 int ncur = cur + 1;
1416
1417 do
1418 ncur <<= 1;
1419 while (cnt > ncur);
1420
1421 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1422 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1423 {
1424 ncur *= elem;
1425 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1426 ncur = ncur - sizeof (void *) * 4;
1427 ncur /= elem;
1428 }
1429
1430 return ncur;
1431 }
1432
1433 static void * noinline ecb_cold
1434 array_realloc (int elem, void *base, int *cur, int cnt)
1435 {
1436 *cur = array_nextsize (elem, *cur, cnt);
1437 return ev_realloc (base, elem * *cur);
1438 }
1439
1440 #define array_init_zero(base,count) \
1441 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1442
1443 #define array_needsize(type,base,cur,cnt,init) \
1444 if (expect_false ((cnt) > (cur))) \
1445 { \
1446 int ecb_unused ocur_ = (cur); \
1447 (base) = (type *)array_realloc \
1448 (sizeof (type), (base), &(cur), (cnt)); \
1449 init ((base) + (ocur_), (cur) - ocur_); \
1450 }
1451
1452 #if 0
1453 #define array_slim(type,stem) \
1454 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1455 { \
1456 stem ## max = array_roundsize (stem ## cnt >> 1); \
1457 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1458 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1459 }
1460 #endif
1461
1462 #define array_free(stem, idx) \
1463 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1464
1465 /*****************************************************************************/
1466
1467 /* dummy callback for pending events */
1468 static void noinline
1469 pendingcb (EV_P_ ev_prepare *w, int revents)
1470 {
1471 }
1472
1473 void noinline
1474 ev_feed_event (EV_P_ void *w, int revents) EV_THROW
1475 {
1476 W w_ = (W)w;
1477 int pri = ABSPRI (w_);
1478
1479 if (expect_false (w_->pending))
1480 pendings [pri][w_->pending - 1].events |= revents;
1481 else
1482 {
1483 w_->pending = ++pendingcnt [pri];
1484 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1485 pendings [pri][w_->pending - 1].w = w_;
1486 pendings [pri][w_->pending - 1].events = revents;
1487 }
1488
1489 pendingpri = NUMPRI - 1;
1490 }
1491
1492 inline_speed void
1493 feed_reverse (EV_P_ W w)
1494 {
1495 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1496 rfeeds [rfeedcnt++] = w;
1497 }
1498
1499 inline_size void
1500 feed_reverse_done (EV_P_ int revents)
1501 {
1502 do
1503 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1504 while (rfeedcnt);
1505 }
1506
1507 inline_speed void
1508 queue_events (EV_P_ W *events, int eventcnt, int type)
1509 {
1510 int i;
1511
1512 for (i = 0; i < eventcnt; ++i)
1513 ev_feed_event (EV_A_ events [i], type);
1514 }
1515
1516 /*****************************************************************************/
1517
1518 inline_speed void
1519 fd_event_nocheck (EV_P_ int fd, int revents)
1520 {
1521 ANFD *anfd = anfds + fd;
1522 ev_io *w;
1523
1524 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1525 {
1526 int ev = w->events & revents;
1527
1528 if (ev)
1529 ev_feed_event (EV_A_ (W)w, ev);
1530 }
1531 }
1532
1533 /* do not submit kernel events for fds that have reify set */
1534 /* because that means they changed while we were polling for new events */
1535 inline_speed void
1536 fd_event (EV_P_ int fd, int revents)
1537 {
1538 ANFD *anfd = anfds + fd;
1539
1540 if (expect_true (!anfd->reify))
1541 fd_event_nocheck (EV_A_ fd, revents);
1542 }
1543
1544 void
1545 ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
1546 {
1547 if (fd >= 0 && fd < anfdmax)
1548 fd_event_nocheck (EV_A_ fd, revents);
1549 }
1550
1551 /* make sure the external fd watch events are in-sync */
1552 /* with the kernel/libev internal state */
1553 inline_size void
1554 fd_reify (EV_P)
1555 {
1556 int i;
1557
1558 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1559 for (i = 0; i < fdchangecnt; ++i)
1560 {
1561 int fd = fdchanges [i];
1562 ANFD *anfd = anfds + fd;
1563
1564 if (anfd->reify & EV__IOFDSET && anfd->head)
1565 {
1566 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1567
1568 if (handle != anfd->handle)
1569 {
1570 unsigned long arg;
1571
1572 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1573
1574 /* handle changed, but fd didn't - we need to do it in two steps */
1575 backend_modify (EV_A_ fd, anfd->events, 0);
1576 anfd->events = 0;
1577 anfd->handle = handle;
1578 }
1579 }
1580 }
1581 #endif
1582
1583 for (i = 0; i < fdchangecnt; ++i)
1584 {
1585 int fd = fdchanges [i];
1586 ANFD *anfd = anfds + fd;
1587 ev_io *w;
1588
1589 unsigned char o_events = anfd->events;
1590 unsigned char o_reify = anfd->reify;
1591
1592 anfd->reify = 0;
1593
1594 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1595 {
1596 anfd->events = 0;
1597
1598 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1599 anfd->events |= (unsigned char)w->events;
1600
1601 if (o_events != anfd->events)
1602 o_reify = EV__IOFDSET; /* actually |= */
1603 }
1604
1605 if (o_reify & EV__IOFDSET)
1606 backend_modify (EV_A_ fd, o_events, anfd->events);
1607 }
1608
1609 fdchangecnt = 0;
1610 }
1611
1612 /* something about the given fd changed */
1613 inline_size void
1614 fd_change (EV_P_ int fd, int flags)
1615 {
1616 unsigned char reify = anfds [fd].reify;
1617 anfds [fd].reify |= flags;
1618
1619 if (expect_true (!reify))
1620 {
1621 ++fdchangecnt;
1622 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1623 fdchanges [fdchangecnt - 1] = fd;
1624 }
1625 }
1626
1627 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1628 inline_speed void ecb_cold
1629 fd_kill (EV_P_ int fd)
1630 {
1631 ev_io *w;
1632
1633 while ((w = (ev_io *)anfds [fd].head))
1634 {
1635 ev_io_stop (EV_A_ w);
1636 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1637 }
1638 }
1639
1640 /* check whether the given fd is actually valid, for error recovery */
1641 inline_size int ecb_cold
1642 fd_valid (int fd)
1643 {
1644 #ifdef _WIN32
1645 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1646 #else
1647 return fcntl (fd, F_GETFD) != -1;
1648 #endif
1649 }
1650
1651 /* called on EBADF to verify fds */
1652 static void noinline ecb_cold
1653 fd_ebadf (EV_P)
1654 {
1655 int fd;
1656
1657 for (fd = 0; fd < anfdmax; ++fd)
1658 if (anfds [fd].events)
1659 if (!fd_valid (fd) && errno == EBADF)
1660 fd_kill (EV_A_ fd);
1661 }
1662
1663 /* called on ENOMEM in select/poll to kill some fds and retry */
1664 static void noinline ecb_cold
1665 fd_enomem (EV_P)
1666 {
1667 int fd;
1668
1669 for (fd = anfdmax; fd--; )
1670 if (anfds [fd].events)
1671 {
1672 fd_kill (EV_A_ fd);
1673 break;
1674 }
1675 }
1676
1677 /* usually called after fork if backend needs to re-arm all fds from scratch */
1678 static void noinline
1679 fd_rearm_all (EV_P)
1680 {
1681 int fd;
1682
1683 for (fd = 0; fd < anfdmax; ++fd)
1684 if (anfds [fd].events)
1685 {
1686 anfds [fd].events = 0;
1687 anfds [fd].emask = 0;
1688 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1689 }
1690 }
1691
1692 /* used to prepare libev internal fd's */
1693 /* this is not fork-safe */
1694 inline_speed void
1695 fd_intern (int fd)
1696 {
1697 #ifdef _WIN32
1698 unsigned long arg = 1;
1699 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1700 #else
1701 fcntl (fd, F_SETFD, FD_CLOEXEC);
1702 fcntl (fd, F_SETFL, O_NONBLOCK);
1703 #endif
1704 }
1705
1706 /*****************************************************************************/
1707
1708 /*
1709 * the heap functions want a real array index. array index 0 is guaranteed to not
1710 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1711 * the branching factor of the d-tree.
1712 */
1713
1714 /*
1715 * at the moment we allow libev the luxury of two heaps,
1716 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1717 * which is more cache-efficient.
1718 * the difference is about 5% with 50000+ watchers.
1719 */
1720 #if EV_USE_4HEAP
1721
1722 #define DHEAP 4
1723 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1724 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1725 #define UPHEAP_DONE(p,k) ((p) == (k))
1726
1727 /* away from the root */
1728 inline_speed void
1729 downheap (ANHE *heap, int N, int k)
1730 {
1731 ANHE he = heap [k];
1732 ANHE *E = heap + N + HEAP0;
1733
1734 for (;;)
1735 {
1736 ev_tstamp minat;
1737 ANHE *minpos;
1738 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1739
1740 /* find minimum child */
1741 if (expect_true (pos + DHEAP - 1 < E))
1742 {
1743 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1744 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1745 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1746 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1747 }
1748 else if (pos < E)
1749 {
1750 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1751 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1752 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1753 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1754 }
1755 else
1756 break;
1757
1758 if (ANHE_at (he) <= minat)
1759 break;
1760
1761 heap [k] = *minpos;
1762 ev_active (ANHE_w (*minpos)) = k;
1763
1764 k = minpos - heap;
1765 }
1766
1767 heap [k] = he;
1768 ev_active (ANHE_w (he)) = k;
1769 }
1770
1771 #else /* 4HEAP */
1772
1773 #define HEAP0 1
1774 #define HPARENT(k) ((k) >> 1)
1775 #define UPHEAP_DONE(p,k) (!(p))
1776
1777 /* away from the root */
1778 inline_speed void
1779 downheap (ANHE *heap, int N, int k)
1780 {
1781 ANHE he = heap [k];
1782
1783 for (;;)
1784 {
1785 int c = k << 1;
1786
1787 if (c >= N + HEAP0)
1788 break;
1789
1790 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1791 ? 1 : 0;
1792
1793 if (ANHE_at (he) <= ANHE_at (heap [c]))
1794 break;
1795
1796 heap [k] = heap [c];
1797 ev_active (ANHE_w (heap [k])) = k;
1798
1799 k = c;
1800 }
1801
1802 heap [k] = he;
1803 ev_active (ANHE_w (he)) = k;
1804 }
1805 #endif
1806
1807 /* towards the root */
1808 inline_speed void
1809 upheap (ANHE *heap, int k)
1810 {
1811 ANHE he = heap [k];
1812
1813 for (;;)
1814 {
1815 int p = HPARENT (k);
1816
1817 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1818 break;
1819
1820 heap [k] = heap [p];
1821 ev_active (ANHE_w (heap [k])) = k;
1822 k = p;
1823 }
1824
1825 heap [k] = he;
1826 ev_active (ANHE_w (he)) = k;
1827 }
1828
1829 /* move an element suitably so it is in a correct place */
1830 inline_size void
1831 adjustheap (ANHE *heap, int N, int k)
1832 {
1833 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1834 upheap (heap, k);
1835 else
1836 downheap (heap, N, k);
1837 }
1838
1839 /* rebuild the heap: this function is used only once and executed rarely */
1840 inline_size void
1841 reheap (ANHE *heap, int N)
1842 {
1843 int i;
1844
1845 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1846 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1847 for (i = 0; i < N; ++i)
1848 upheap (heap, i + HEAP0);
1849 }
1850
1851 /*****************************************************************************/
1852
1853 /* associate signal watchers to a signal signal */
1854 typedef struct
1855 {
1856 EV_ATOMIC_T pending;
1857 #if EV_MULTIPLICITY
1858 EV_P;
1859 #endif
1860 WL head;
1861 } ANSIG;
1862
1863 static ANSIG signals [EV_NSIG - 1];
1864
1865 /*****************************************************************************/
1866
1867 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1868
1869 static void noinline ecb_cold
1870 evpipe_init (EV_P)
1871 {
1872 if (!ev_is_active (&pipe_w))
1873 {
1874 # if EV_USE_EVENTFD
1875 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1876 if (evfd < 0 && errno == EINVAL)
1877 evfd = eventfd (0, 0);
1878
1879 if (evfd >= 0)
1880 {
1881 evpipe [0] = -1;
1882 fd_intern (evfd); /* doing it twice doesn't hurt */
1883 ev_io_set (&pipe_w, evfd, EV_READ);
1884 }
1885 else
1886 # endif
1887 {
1888 while (pipe (evpipe))
1889 ev_syserr ("(libev) error creating signal/async pipe");
1890
1891 fd_intern (evpipe [0]);
1892 fd_intern (evpipe [1]);
1893 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1894 }
1895
1896 ev_io_start (EV_A_ &pipe_w);
1897 ev_unref (EV_A); /* watcher should not keep loop alive */
1898 }
1899 }
1900
1901 inline_speed void
1902 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1903 {
1904 ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
1905
1906 if (expect_true (*flag))
1907 return;
1908
1909 *flag = 1;
1910 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1911
1912 pipe_write_skipped = 1;
1913
1914 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1915
1916 if (pipe_write_wanted)
1917 {
1918 int old_errno;
1919
1920 pipe_write_skipped = 0;
1921 ECB_MEMORY_FENCE_RELEASE;
1922
1923 old_errno = errno; /* save errno because write will clobber it */
1924
1925 #if EV_USE_EVENTFD
1926 if (evfd >= 0)
1927 {
1928 uint64_t counter = 1;
1929 write (evfd, &counter, sizeof (uint64_t));
1930 }
1931 else
1932 #endif
1933 {
1934 #ifdef _WIN32
1935 WSABUF buf;
1936 DWORD sent;
1937 buf.buf = &buf;
1938 buf.len = 1;
1939 WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
1940 #else
1941 write (evpipe [1], &(evpipe [1]), 1);
1942 #endif
1943 }
1944
1945 errno = old_errno;
1946 }
1947 }
1948
1949 /* called whenever the libev signal pipe */
1950 /* got some events (signal, async) */
1951 static void
1952 pipecb (EV_P_ ev_io *iow, int revents)
1953 {
1954 int i;
1955
1956 if (revents & EV_READ)
1957 {
1958 #if EV_USE_EVENTFD
1959 if (evfd >= 0)
1960 {
1961 uint64_t counter;
1962 read (evfd, &counter, sizeof (uint64_t));
1963 }
1964 else
1965 #endif
1966 {
1967 char dummy[4];
1968 #ifdef _WIN32
1969 WSABUF buf;
1970 DWORD recvd;
1971 DWORD flags = 0;
1972 buf.buf = dummy;
1973 buf.len = sizeof (dummy);
1974 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
1975 #else
1976 read (evpipe [0], &dummy, sizeof (dummy));
1977 #endif
1978 }
1979 }
1980
1981 pipe_write_skipped = 0;
1982
1983 ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
1984
1985 #if EV_SIGNAL_ENABLE
1986 if (sig_pending)
1987 {
1988 sig_pending = 0;
1989
1990 ECB_MEMORY_FENCE;
1991
1992 for (i = EV_NSIG - 1; i--; )
1993 if (expect_false (signals [i].pending))
1994 ev_feed_signal_event (EV_A_ i + 1);
1995 }
1996 #endif
1997
1998 #if EV_ASYNC_ENABLE
1999 if (async_pending)
2000 {
2001 async_pending = 0;
2002
2003 ECB_MEMORY_FENCE;
2004
2005 for (i = asynccnt; i--; )
2006 if (asyncs [i]->sent)
2007 {
2008 asyncs [i]->sent = 0;
2009 ECB_MEMORY_FENCE_RELEASE;
2010 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
2011 }
2012 }
2013 #endif
2014 }
2015
2016 /*****************************************************************************/
2017
2018 void
2019 ev_feed_signal (int signum) EV_THROW
2020 {
2021 #if EV_MULTIPLICITY
2022 EV_P = signals [signum - 1].loop;
2023
2024 if (!EV_A)
2025 return;
2026 #endif
2027
2028 if (!ev_active (&pipe_w))
2029 return;
2030
2031 signals [signum - 1].pending = 1;
2032 evpipe_write (EV_A_ &sig_pending);
2033 }
2034
2035 static void
2036 ev_sighandler (int signum)
2037 {
2038 #ifdef _WIN32
2039 signal (signum, ev_sighandler);
2040 #endif
2041
2042 ev_feed_signal (signum);
2043 }
2044
2045 void noinline
2046 ev_feed_signal_event (EV_P_ int signum) EV_THROW
2047 {
2048 WL w;
2049
2050 if (expect_false (signum <= 0 || signum > EV_NSIG))
2051 return;
2052
2053 --signum;
2054
2055 #if EV_MULTIPLICITY
2056 /* it is permissible to try to feed a signal to the wrong loop */
2057 /* or, likely more useful, feeding a signal nobody is waiting for */
2058
2059 if (expect_false (signals [signum].loop != EV_A))
2060 return;
2061 #endif
2062
2063 signals [signum].pending = 0;
2064 MEMORY_FENCE_RELEASE;
2065
2066 for (w = signals [signum].head; w; w = w->next)
2067 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2068 }
2069
2070 #if EV_USE_SIGNALFD
2071 static void
2072 sigfdcb (EV_P_ ev_io *iow, int revents)
2073 {
2074 struct signalfd_siginfo si[2], *sip; /* these structs are big */
2075
2076 for (;;)
2077 {
2078 ssize_t res = read (sigfd, si, sizeof (si));
2079
2080 /* not ISO-C, as res might be -1, but works with SuS */
2081 for (sip = si; (char *)sip < (char *)si + res; ++sip)
2082 ev_feed_signal_event (EV_A_ sip->ssi_signo);
2083
2084 if (res < (ssize_t)sizeof (si))
2085 break;
2086 }
2087 }
2088 #endif
2089
2090 #endif
2091
2092 /*****************************************************************************/
2093
2094 #if EV_CHILD_ENABLE
2095 static WL childs [EV_PID_HASHSIZE];
2096
2097 static ev_signal childev;
2098
2099 #ifndef WIFCONTINUED
2100 # define WIFCONTINUED(status) 0
2101 #endif
2102
2103 /* handle a single child status event */
2104 inline_speed void
2105 child_reap (EV_P_ int chain, int pid, int status)
2106 {
2107 ev_child *w;
2108 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2109
2110 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2111 {
2112 if ((w->pid == pid || !w->pid)
2113 && (!traced || (w->flags & 1)))
2114 {
2115 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2116 w->rpid = pid;
2117 w->rstatus = status;
2118 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2119 }
2120 }
2121 }
2122
2123 #ifndef WCONTINUED
2124 # define WCONTINUED 0
2125 #endif
2126
2127 /* called on sigchld etc., calls waitpid */
2128 static void
2129 childcb (EV_P_ ev_signal *sw, int revents)
2130 {
2131 int pid, status;
2132
2133 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
2134 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
2135 if (!WCONTINUED
2136 || errno != EINVAL
2137 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2138 return;
2139
2140 /* make sure we are called again until all children have been reaped */
2141 /* we need to do it this way so that the callback gets called before we continue */
2142 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2143
2144 child_reap (EV_A_ pid, pid, status);
2145 if ((EV_PID_HASHSIZE) > 1)
2146 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2147 }
2148
2149 #endif
2150
2151 /*****************************************************************************/
2152
2153 #if EV_USE_IOCP
2154 # include "ev_iocp.c"
2155 #endif
2156 #if EV_USE_PORT
2157 # include "ev_port.c"
2158 #endif
2159 #if EV_USE_KQUEUE
2160 # include "ev_kqueue.c"
2161 #endif
2162 #if EV_USE_EPOLL
2163 # include "ev_epoll.c"
2164 #endif
2165 #if EV_USE_POLL
2166 # include "ev_poll.c"
2167 #endif
2168 #if EV_USE_SELECT
2169 # include "ev_select.c"
2170 #endif
2171
2172 int ecb_cold
2173 ev_version_major (void) EV_THROW
2174 {
2175 return EV_VERSION_MAJOR;
2176 }
2177
2178 int ecb_cold
2179 ev_version_minor (void) EV_THROW
2180 {
2181 return EV_VERSION_MINOR;
2182 }
2183
2184 /* return true if we are running with elevated privileges and should ignore env variables */
2185 int inline_size ecb_cold
2186 enable_secure (void)
2187 {
2188 #ifdef _WIN32
2189 return 0;
2190 #else
2191 return getuid () != geteuid ()
2192 || getgid () != getegid ();
2193 #endif
2194 }
2195
2196 unsigned int ecb_cold
2197 ev_supported_backends (void) EV_THROW
2198 {
2199 unsigned int flags = 0;
2200
2201 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2202 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2203 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2204 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2205 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2206
2207 return flags;
2208 }
2209
2210 unsigned int ecb_cold
2211 ev_recommended_backends (void) EV_THROW
2212 {
2213 unsigned int flags = ev_supported_backends ();
2214
2215 #ifndef __NetBSD__
2216 /* kqueue is borked on everything but netbsd apparently */
2217 /* it usually doesn't work correctly on anything but sockets and pipes */
2218 flags &= ~EVBACKEND_KQUEUE;
2219 #endif
2220 #ifdef __APPLE__
2221 /* only select works correctly on that "unix-certified" platform */
2222 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2223 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2224 #endif
2225 #ifdef __FreeBSD__
2226 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2227 #endif
2228
2229 return flags;
2230 }
2231
2232 unsigned int ecb_cold
2233 ev_embeddable_backends (void) EV_THROW
2234 {
2235 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2236
2237 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2238 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2239 flags &= ~EVBACKEND_EPOLL;
2240
2241 return flags;
2242 }
2243
2244 unsigned int
2245 ev_backend (EV_P) EV_THROW
2246 {
2247 return backend;
2248 }
2249
2250 #if EV_FEATURE_API
2251 unsigned int
2252 ev_iteration (EV_P) EV_THROW
2253 {
2254 return loop_count;
2255 }
2256
2257 unsigned int
2258 ev_depth (EV_P) EV_THROW
2259 {
2260 return loop_depth;
2261 }
2262
2263 void
2264 ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2265 {
2266 io_blocktime = interval;
2267 }
2268
2269 void
2270 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2271 {
2272 timeout_blocktime = interval;
2273 }
2274
2275 void
2276 ev_set_userdata (EV_P_ void *data) EV_THROW
2277 {
2278 userdata = data;
2279 }
2280
2281 void *
2282 ev_userdata (EV_P) EV_THROW
2283 {
2284 return userdata;
2285 }
2286
2287 void
2288 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) EV_THROW
2289 {
2290 invoke_cb = invoke_pending_cb;
2291 }
2292
2293 void
2294 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
2295 {
2296 release_cb = release;
2297 acquire_cb = acquire;
2298 }
2299 #endif
2300
2301 /* initialise a loop structure, must be zero-initialised */
2302 static void noinline ecb_cold
2303 loop_init (EV_P_ unsigned int flags) EV_THROW
2304 {
2305 if (!backend)
2306 {
2307 origflags = flags;
2308
2309 #if EV_USE_REALTIME
2310 if (!have_realtime)
2311 {
2312 struct timespec ts;
2313
2314 if (!clock_gettime (CLOCK_REALTIME, &ts))
2315 have_realtime = 1;
2316 }
2317 #endif
2318
2319 #if EV_USE_MONOTONIC
2320 if (!have_monotonic)
2321 {
2322 struct timespec ts;
2323
2324 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2325 have_monotonic = 1;
2326 }
2327 #endif
2328
2329 /* pid check not overridable via env */
2330 #ifndef _WIN32
2331 if (flags & EVFLAG_FORKCHECK)
2332 curpid = getpid ();
2333 #endif
2334
2335 if (!(flags & EVFLAG_NOENV)
2336 && !enable_secure ()
2337 && getenv ("LIBEV_FLAGS"))
2338 flags = atoi (getenv ("LIBEV_FLAGS"));
2339
2340 ev_rt_now = ev_time ();
2341 mn_now = get_clock ();
2342 now_floor = mn_now;
2343 rtmn_diff = ev_rt_now - mn_now;
2344 #if EV_FEATURE_API
2345 invoke_cb = ev_invoke_pending;
2346 #endif
2347
2348 io_blocktime = 0.;
2349 timeout_blocktime = 0.;
2350 backend = 0;
2351 backend_fd = -1;
2352 sig_pending = 0;
2353 #if EV_ASYNC_ENABLE
2354 async_pending = 0;
2355 #endif
2356 pipe_write_skipped = 0;
2357 pipe_write_wanted = 0;
2358 #if EV_USE_INOTIFY
2359 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2360 #endif
2361 #if EV_USE_SIGNALFD
2362 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2363 #endif
2364
2365 if (!(flags & EVBACKEND_MASK))
2366 flags |= ev_recommended_backends ();
2367
2368 #if EV_USE_IOCP
2369 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2370 #endif
2371 #if EV_USE_PORT
2372 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2373 #endif
2374 #if EV_USE_KQUEUE
2375 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2376 #endif
2377 #if EV_USE_EPOLL
2378 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2379 #endif
2380 #if EV_USE_POLL
2381 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2382 #endif
2383 #if EV_USE_SELECT
2384 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2385 #endif
2386
2387 ev_prepare_init (&pending_w, pendingcb);
2388
2389 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2390 ev_init (&pipe_w, pipecb);
2391 ev_set_priority (&pipe_w, EV_MAXPRI);
2392 #endif
2393 }
2394 }
2395
2396 /* free up a loop structure */
2397 void ecb_cold
2398 ev_loop_destroy (EV_P)
2399 {
2400 int i;
2401
2402 #if EV_MULTIPLICITY
2403 /* mimic free (0) */
2404 if (!EV_A)
2405 return;
2406 #endif
2407
2408 #if EV_CLEANUP_ENABLE
2409 /* queue cleanup watchers (and execute them) */
2410 if (expect_false (cleanupcnt))
2411 {
2412 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2413 EV_INVOKE_PENDING;
2414 }
2415 #endif
2416
2417 #if EV_CHILD_ENABLE
2418 if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
2419 {
2420 ev_ref (EV_A); /* child watcher */
2421 ev_signal_stop (EV_A_ &childev);
2422 }
2423 #endif
2424
2425 if (ev_is_active (&pipe_w))
2426 {
2427 /*ev_ref (EV_A);*/
2428 /*ev_io_stop (EV_A_ &pipe_w);*/
2429
2430 #if EV_USE_EVENTFD
2431 if (evfd >= 0)
2432 close (evfd);
2433 #endif
2434
2435 if (evpipe [0] >= 0)
2436 {
2437 EV_WIN32_CLOSE_FD (evpipe [0]);
2438 EV_WIN32_CLOSE_FD (evpipe [1]);
2439 }
2440 }
2441
2442 #if EV_USE_SIGNALFD
2443 if (ev_is_active (&sigfd_w))
2444 close (sigfd);
2445 #endif
2446
2447 #if EV_USE_INOTIFY
2448 if (fs_fd >= 0)
2449 close (fs_fd);
2450 #endif
2451
2452 if (backend_fd >= 0)
2453 close (backend_fd);
2454
2455 #if EV_USE_IOCP
2456 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2457 #endif
2458 #if EV_USE_PORT
2459 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2460 #endif
2461 #if EV_USE_KQUEUE
2462 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2463 #endif
2464 #if EV_USE_EPOLL
2465 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2466 #endif
2467 #if EV_USE_POLL
2468 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2469 #endif
2470 #if EV_USE_SELECT
2471 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2472 #endif
2473
2474 for (i = NUMPRI; i--; )
2475 {
2476 array_free (pending, [i]);
2477 #if EV_IDLE_ENABLE
2478 array_free (idle, [i]);
2479 #endif
2480 }
2481
2482 ev_free (anfds); anfds = 0; anfdmax = 0;
2483
2484 /* have to use the microsoft-never-gets-it-right macro */
2485 array_free (rfeed, EMPTY);
2486 array_free (fdchange, EMPTY);
2487 array_free (timer, EMPTY);
2488 #if EV_PERIODIC_ENABLE
2489 array_free (periodic, EMPTY);
2490 #endif
2491 #if EV_FORK_ENABLE
2492 array_free (fork, EMPTY);
2493 #endif
2494 #if EV_CLEANUP_ENABLE
2495 array_free (cleanup, EMPTY);
2496 #endif
2497 array_free (prepare, EMPTY);
2498 array_free (check, EMPTY);
2499 #if EV_ASYNC_ENABLE
2500 array_free (async, EMPTY);
2501 #endif
2502
2503 backend = 0;
2504
2505 #if EV_MULTIPLICITY
2506 if (ev_is_default_loop (EV_A))
2507 #endif
2508 ev_default_loop_ptr = 0;
2509 #if EV_MULTIPLICITY
2510 else
2511 ev_free (EV_A);
2512 #endif
2513 }
2514
2515 #if EV_USE_INOTIFY
2516 inline_size void infy_fork (EV_P);
2517 #endif
2518
2519 inline_size void
2520 loop_fork (EV_P)
2521 {
2522 #if EV_USE_PORT
2523 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2524 #endif
2525 #if EV_USE_KQUEUE
2526 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2527 #endif
2528 #if EV_USE_EPOLL
2529 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2530 #endif
2531 #if EV_USE_INOTIFY
2532 infy_fork (EV_A);
2533 #endif
2534
2535 if (ev_is_active (&pipe_w))
2536 {
2537 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2538
2539 ev_ref (EV_A);
2540 ev_io_stop (EV_A_ &pipe_w);
2541
2542 #if EV_USE_EVENTFD
2543 if (evfd >= 0)
2544 close (evfd);
2545 #endif
2546
2547 if (evpipe [0] >= 0)
2548 {
2549 EV_WIN32_CLOSE_FD (evpipe [0]);
2550 EV_WIN32_CLOSE_FD (evpipe [1]);
2551 }
2552
2553 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2554 evpipe_init (EV_A);
2555 /* now iterate over everything, in case we missed something */
2556 pipecb (EV_A_ &pipe_w, EV_READ);
2557 #endif
2558 }
2559
2560 postfork = 0;
2561 }
2562
2563 #if EV_MULTIPLICITY
2564
2565 struct ev_loop * ecb_cold
2566 ev_loop_new (unsigned int flags) EV_THROW
2567 {
2568 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2569
2570 memset (EV_A, 0, sizeof (struct ev_loop));
2571 loop_init (EV_A_ flags);
2572
2573 if (ev_backend (EV_A))
2574 return EV_A;
2575
2576 ev_free (EV_A);
2577 return 0;
2578 }
2579
2580 #endif /* multiplicity */
2581
2582 #if EV_VERIFY
2583 static void noinline ecb_cold
2584 verify_watcher (EV_P_ W w)
2585 {
2586 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2587
2588 if (w->pending)
2589 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2590 }
2591
2592 static void noinline ecb_cold
2593 verify_heap (EV_P_ ANHE *heap, int N)
2594 {
2595 int i;
2596
2597 for (i = HEAP0; i < N + HEAP0; ++i)
2598 {
2599 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2600 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2601 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2602
2603 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2604 }
2605 }
2606
2607 static void noinline ecb_cold
2608 array_verify (EV_P_ W *ws, int cnt)
2609 {
2610 while (cnt--)
2611 {
2612 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2613 verify_watcher (EV_A_ ws [cnt]);
2614 }
2615 }
2616 #endif
2617
2618 #if EV_FEATURE_API
2619 void ecb_cold
2620 ev_verify (EV_P) EV_THROW
2621 {
2622 #if EV_VERIFY
2623 int i;
2624 WL w, w2;
2625
2626 assert (activecnt >= -1);
2627
2628 assert (fdchangemax >= fdchangecnt);
2629 for (i = 0; i < fdchangecnt; ++i)
2630 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2631
2632 assert (anfdmax >= 0);
2633 for (i = 0; i < anfdmax; ++i)
2634 {
2635 int j = 0;
2636
2637 for (w = w2 = anfds [i].head; w; w = w->next)
2638 {
2639 verify_watcher (EV_A_ (W)w);
2640
2641 if (j++ & 1)
2642 {
2643 assert (("libev: io watcher list contains a loop", w != w2));
2644 w2 = w2->next;
2645 }
2646
2647 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2648 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2649 }
2650 }
2651
2652 assert (timermax >= timercnt);
2653 verify_heap (EV_A_ timers, timercnt);
2654
2655 #if EV_PERIODIC_ENABLE
2656 assert (periodicmax >= periodiccnt);
2657 verify_heap (EV_A_ periodics, periodiccnt);
2658 #endif
2659
2660 for (i = NUMPRI; i--; )
2661 {
2662 assert (pendingmax [i] >= pendingcnt [i]);
2663 #if EV_IDLE_ENABLE
2664 assert (idleall >= 0);
2665 assert (idlemax [i] >= idlecnt [i]);
2666 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2667 #endif
2668 }
2669
2670 #if EV_FORK_ENABLE
2671 assert (forkmax >= forkcnt);
2672 array_verify (EV_A_ (W *)forks, forkcnt);
2673 #endif
2674
2675 #if EV_CLEANUP_ENABLE
2676 assert (cleanupmax >= cleanupcnt);
2677 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2678 #endif
2679
2680 #if EV_ASYNC_ENABLE
2681 assert (asyncmax >= asynccnt);
2682 array_verify (EV_A_ (W *)asyncs, asynccnt);
2683 #endif
2684
2685 #if EV_PREPARE_ENABLE
2686 assert (preparemax >= preparecnt);
2687 array_verify (EV_A_ (W *)prepares, preparecnt);
2688 #endif
2689
2690 #if EV_CHECK_ENABLE
2691 assert (checkmax >= checkcnt);
2692 array_verify (EV_A_ (W *)checks, checkcnt);
2693 #endif
2694
2695 # if 0
2696 #if EV_CHILD_ENABLE
2697 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2698 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2699 #endif
2700 # endif
2701 #endif
2702 }
2703 #endif
2704
2705 #if EV_MULTIPLICITY
2706 struct ev_loop * ecb_cold
2707 #else
2708 int
2709 #endif
2710 ev_default_loop (unsigned int flags) EV_THROW
2711 {
2712 if (!ev_default_loop_ptr)
2713 {
2714 #if EV_MULTIPLICITY
2715 EV_P = ev_default_loop_ptr = &default_loop_struct;
2716 #else
2717 ev_default_loop_ptr = 1;
2718 #endif
2719
2720 loop_init (EV_A_ flags);
2721
2722 if (ev_backend (EV_A))
2723 {
2724 #if EV_CHILD_ENABLE
2725 ev_signal_init (&childev, childcb, SIGCHLD);
2726 ev_set_priority (&childev, EV_MAXPRI);
2727 ev_signal_start (EV_A_ &childev);
2728 ev_unref (EV_A); /* child watcher should not keep loop alive */
2729 #endif
2730 }
2731 else
2732 ev_default_loop_ptr = 0;
2733 }
2734
2735 return ev_default_loop_ptr;
2736 }
2737
2738 void
2739 ev_loop_fork (EV_P) EV_THROW
2740 {
2741 postfork = 1; /* must be in line with ev_default_fork */
2742 }
2743
2744 /*****************************************************************************/
2745
2746 void
2747 ev_invoke (EV_P_ void *w, int revents)
2748 {
2749 EV_CB_INVOKE ((W)w, revents);
2750 }
2751
2752 unsigned int
2753 ev_pending_count (EV_P) EV_THROW
2754 {
2755 int pri;
2756 unsigned int count = 0;
2757
2758 for (pri = NUMPRI; pri--; )
2759 count += pendingcnt [pri];
2760
2761 return count;
2762 }
2763
2764 void noinline
2765 ev_invoke_pending (EV_P)
2766 {
2767 for (pendingpri = NUMPRI; pendingpri--; ) /* pendingpri is modified during the loop */
2768 while (pendingcnt [pendingpri])
2769 {
2770 ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
2771
2772 p->w->pending = 0;
2773 EV_CB_INVOKE (p->w, p->events);
2774 EV_FREQUENT_CHECK;
2775 }
2776 }
2777
2778 #if EV_IDLE_ENABLE
2779 /* make idle watchers pending. this handles the "call-idle */
2780 /* only when higher priorities are idle" logic */
2781 inline_size void
2782 idle_reify (EV_P)
2783 {
2784 if (expect_false (idleall))
2785 {
2786 int pri;
2787
2788 for (pri = NUMPRI; pri--; )
2789 {
2790 if (pendingcnt [pri])
2791 break;
2792
2793 if (idlecnt [pri])
2794 {
2795 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2796 break;
2797 }
2798 }
2799 }
2800 }
2801 #endif
2802
2803 /* make timers pending */
2804 inline_size void
2805 timers_reify (EV_P)
2806 {
2807 EV_FREQUENT_CHECK;
2808
2809 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2810 {
2811 do
2812 {
2813 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2814
2815 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2816
2817 /* first reschedule or stop timer */
2818 if (w->repeat)
2819 {
2820 ev_at (w) += w->repeat;
2821 if (ev_at (w) < mn_now)
2822 ev_at (w) = mn_now;
2823
2824 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2825
2826 ANHE_at_cache (timers [HEAP0]);
2827 downheap (timers, timercnt, HEAP0);
2828 }
2829 else
2830 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2831
2832 EV_FREQUENT_CHECK;
2833 feed_reverse (EV_A_ (W)w);
2834 }
2835 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2836
2837 feed_reverse_done (EV_A_ EV_TIMER);
2838 }
2839 }
2840
2841 #if EV_PERIODIC_ENABLE
2842
2843 static void noinline
2844 periodic_recalc (EV_P_ ev_periodic *w)
2845 {
2846 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2847 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2848
2849 /* the above almost always errs on the low side */
2850 while (at <= ev_rt_now)
2851 {
2852 ev_tstamp nat = at + w->interval;
2853
2854 /* when resolution fails us, we use ev_rt_now */
2855 if (expect_false (nat == at))
2856 {
2857 at = ev_rt_now;
2858 break;
2859 }
2860
2861 at = nat;
2862 }
2863
2864 ev_at (w) = at;
2865 }
2866
2867 /* make periodics pending */
2868 inline_size void
2869 periodics_reify (EV_P)
2870 {
2871 EV_FREQUENT_CHECK;
2872
2873 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2874 {
2875 do
2876 {
2877 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2878
2879 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2880
2881 /* first reschedule or stop timer */
2882 if (w->reschedule_cb)
2883 {
2884 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2885
2886 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2887
2888 ANHE_at_cache (periodics [HEAP0]);
2889 downheap (periodics, periodiccnt, HEAP0);
2890 }
2891 else if (w->interval)
2892 {
2893 periodic_recalc (EV_A_ w);
2894 ANHE_at_cache (periodics [HEAP0]);
2895 downheap (periodics, periodiccnt, HEAP0);
2896 }
2897 else
2898 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2899
2900 EV_FREQUENT_CHECK;
2901 feed_reverse (EV_A_ (W)w);
2902 }
2903 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2904
2905 feed_reverse_done (EV_A_ EV_PERIODIC);
2906 }
2907 }
2908
2909 /* simply recalculate all periodics */
2910 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2911 static void noinline ecb_cold
2912 periodics_reschedule (EV_P)
2913 {
2914 int i;
2915
2916 /* adjust periodics after time jump */
2917 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2918 {
2919 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2920
2921 if (w->reschedule_cb)
2922 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2923 else if (w->interval)
2924 periodic_recalc (EV_A_ w);
2925
2926 ANHE_at_cache (periodics [i]);
2927 }
2928
2929 reheap (periodics, periodiccnt);
2930 }
2931 #endif
2932
2933 /* adjust all timers by a given offset */
2934 static void noinline ecb_cold
2935 timers_reschedule (EV_P_ ev_tstamp adjust)
2936 {
2937 int i;
2938
2939 for (i = 0; i < timercnt; ++i)
2940 {
2941 ANHE *he = timers + i + HEAP0;
2942 ANHE_w (*he)->at += adjust;
2943 ANHE_at_cache (*he);
2944 }
2945 }
2946
2947 /* fetch new monotonic and realtime times from the kernel */
2948 /* also detect if there was a timejump, and act accordingly */
2949 inline_speed void
2950 time_update (EV_P_ ev_tstamp max_block)
2951 {
2952 #if EV_USE_MONOTONIC
2953 if (expect_true (have_monotonic))
2954 {
2955 int i;
2956 ev_tstamp odiff = rtmn_diff;
2957
2958 mn_now = get_clock ();
2959
2960 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2961 /* interpolate in the meantime */
2962 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2963 {
2964 ev_rt_now = rtmn_diff + mn_now;
2965 return;
2966 }
2967
2968 now_floor = mn_now;
2969 ev_rt_now = ev_time ();
2970
2971 /* loop a few times, before making important decisions.
2972 * on the choice of "4": one iteration isn't enough,
2973 * in case we get preempted during the calls to
2974 * ev_time and get_clock. a second call is almost guaranteed
2975 * to succeed in that case, though. and looping a few more times
2976 * doesn't hurt either as we only do this on time-jumps or
2977 * in the unlikely event of having been preempted here.
2978 */
2979 for (i = 4; --i; )
2980 {
2981 ev_tstamp diff;
2982 rtmn_diff = ev_rt_now - mn_now;
2983
2984 diff = odiff - rtmn_diff;
2985
2986 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2987 return; /* all is well */
2988
2989 ev_rt_now = ev_time ();
2990 mn_now = get_clock ();
2991 now_floor = mn_now;
2992 }
2993
2994 /* no timer adjustment, as the monotonic clock doesn't jump */
2995 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2996 # if EV_PERIODIC_ENABLE
2997 periodics_reschedule (EV_A);
2998 # endif
2999 }
3000 else
3001 #endif
3002 {
3003 ev_rt_now = ev_time ();
3004
3005 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
3006 {
3007 /* adjust timers. this is easy, as the offset is the same for all of them */
3008 timers_reschedule (EV_A_ ev_rt_now - mn_now);
3009 #if EV_PERIODIC_ENABLE
3010 periodics_reschedule (EV_A);
3011 #endif
3012 }
3013
3014 mn_now = ev_rt_now;
3015 }
3016 }
3017
3018 int
3019 ev_run (EV_P_ int flags)
3020 {
3021 #if EV_FEATURE_API
3022 ++loop_depth;
3023 #endif
3024
3025 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
3026
3027 loop_done = EVBREAK_CANCEL;
3028
3029 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
3030
3031 do
3032 {
3033 #if EV_VERIFY >= 2
3034 ev_verify (EV_A);
3035 #endif
3036
3037 #ifndef _WIN32
3038 if (expect_false (curpid)) /* penalise the forking check even more */
3039 if (expect_false (getpid () != curpid))
3040 {
3041 curpid = getpid ();
3042 postfork = 1;
3043 }
3044 #endif
3045
3046 #if EV_FORK_ENABLE
3047 /* we might have forked, so queue fork handlers */
3048 if (expect_false (postfork))
3049 if (forkcnt)
3050 {
3051 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
3052 EV_INVOKE_PENDING;
3053 }
3054 #endif
3055
3056 #if EV_PREPARE_ENABLE
3057 /* queue prepare watchers (and execute them) */
3058 if (expect_false (preparecnt))
3059 {
3060 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
3061 EV_INVOKE_PENDING;
3062 }
3063 #endif
3064
3065 if (expect_false (loop_done))
3066 break;
3067
3068 /* we might have forked, so reify kernel state if necessary */
3069 if (expect_false (postfork))
3070 loop_fork (EV_A);
3071
3072 /* update fd-related kernel structures */
3073 fd_reify (EV_A);
3074
3075 /* calculate blocking time */
3076 {
3077 ev_tstamp waittime = 0.;
3078 ev_tstamp sleeptime = 0.;
3079
3080 /* remember old timestamp for io_blocktime calculation */
3081 ev_tstamp prev_mn_now = mn_now;
3082
3083 /* update time to cancel out callback processing overhead */
3084 time_update (EV_A_ 1e100);
3085
3086 /* from now on, we want a pipe-wake-up */
3087 pipe_write_wanted = 1;
3088
3089 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3090
3091 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3092 {
3093 waittime = MAX_BLOCKTIME;
3094
3095 if (timercnt)
3096 {
3097 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3098 if (waittime > to) waittime = to;
3099 }
3100
3101 #if EV_PERIODIC_ENABLE
3102 if (periodiccnt)
3103 {
3104 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3105 if (waittime > to) waittime = to;
3106 }
3107 #endif
3108
3109 /* don't let timeouts decrease the waittime below timeout_blocktime */
3110 if (expect_false (waittime < timeout_blocktime))
3111 waittime = timeout_blocktime;
3112
3113 /* at this point, we NEED to wait, so we have to ensure */
3114 /* to pass a minimum nonzero value to the backend */
3115 if (expect_false (waittime < backend_mintime))
3116 waittime = backend_mintime;
3117
3118 /* extra check because io_blocktime is commonly 0 */
3119 if (expect_false (io_blocktime))
3120 {
3121 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3122
3123 if (sleeptime > waittime - backend_mintime)
3124 sleeptime = waittime - backend_mintime;
3125
3126 if (expect_true (sleeptime > 0.))
3127 {
3128 ev_sleep (sleeptime);
3129 waittime -= sleeptime;
3130 }
3131 }
3132 }
3133
3134 #if EV_FEATURE_API
3135 ++loop_count;
3136 #endif
3137 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3138 backend_poll (EV_A_ waittime);
3139 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3140
3141 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3142
3143 if (pipe_write_skipped)
3144 {
3145 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3146 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3147 }
3148
3149
3150 /* update ev_rt_now, do magic */
3151 time_update (EV_A_ waittime + sleeptime);
3152 }
3153
3154 /* queue pending timers and reschedule them */
3155 timers_reify (EV_A); /* relative timers called last */
3156 #if EV_PERIODIC_ENABLE
3157 periodics_reify (EV_A); /* absolute timers called first */
3158 #endif
3159
3160 #if EV_IDLE_ENABLE
3161 /* queue idle watchers unless other events are pending */
3162 idle_reify (EV_A);
3163 #endif
3164
3165 #if EV_CHECK_ENABLE
3166 /* queue check watchers, to be executed first */
3167 if (expect_false (checkcnt))
3168 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3169 #endif
3170
3171 EV_INVOKE_PENDING;
3172 }
3173 while (expect_true (
3174 activecnt
3175 && !loop_done
3176 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3177 ));
3178
3179 if (loop_done == EVBREAK_ONE)
3180 loop_done = EVBREAK_CANCEL;
3181
3182 #if EV_FEATURE_API
3183 --loop_depth;
3184 #endif
3185
3186 return activecnt;
3187 }
3188
3189 void
3190 ev_break (EV_P_ int how) EV_THROW
3191 {
3192 loop_done = how;
3193 }
3194
3195 void
3196 ev_ref (EV_P) EV_THROW
3197 {
3198 ++activecnt;
3199 }
3200
3201 void
3202 ev_unref (EV_P) EV_THROW
3203 {
3204 --activecnt;
3205 }
3206
3207 void
3208 ev_now_update (EV_P) EV_THROW
3209 {
3210 time_update (EV_A_ 1e100);
3211 }
3212
3213 void
3214 ev_suspend (EV_P) EV_THROW
3215 {
3216 ev_now_update (EV_A);
3217 }
3218
3219 void
3220 ev_resume (EV_P) EV_THROW
3221 {
3222 ev_tstamp mn_prev = mn_now;
3223
3224 ev_now_update (EV_A);
3225 timers_reschedule (EV_A_ mn_now - mn_prev);
3226 #if EV_PERIODIC_ENABLE
3227 /* TODO: really do this? */
3228 periodics_reschedule (EV_A);
3229 #endif
3230 }
3231
3232 /*****************************************************************************/
3233 /* singly-linked list management, used when the expected list length is short */
3234
3235 inline_size void
3236 wlist_add (WL *head, WL elem)
3237 {
3238 elem->next = *head;
3239 *head = elem;
3240 }
3241
3242 inline_size void
3243 wlist_del (WL *head, WL elem)
3244 {
3245 while (*head)
3246 {
3247 if (expect_true (*head == elem))
3248 {
3249 *head = elem->next;
3250 break;
3251 }
3252
3253 head = &(*head)->next;
3254 }
3255 }
3256
3257 /* internal, faster, version of ev_clear_pending */
3258 inline_speed void
3259 clear_pending (EV_P_ W w)
3260 {
3261 if (w->pending)
3262 {
3263 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3264 w->pending = 0;
3265 }
3266 }
3267
3268 int
3269 ev_clear_pending (EV_P_ void *w) EV_THROW
3270 {
3271 W w_ = (W)w;
3272 int pending = w_->pending;
3273
3274 if (expect_true (pending))
3275 {
3276 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3277 p->w = (W)&pending_w;
3278 w_->pending = 0;
3279 return p->events;
3280 }
3281 else
3282 return 0;
3283 }
3284
3285 inline_size void
3286 pri_adjust (EV_P_ W w)
3287 {
3288 int pri = ev_priority (w);
3289 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3290 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3291 ev_set_priority (w, pri);
3292 }
3293
3294 inline_speed void
3295 ev_start (EV_P_ W w, int active)
3296 {
3297 pri_adjust (EV_A_ w);
3298 w->active = active;
3299 ev_ref (EV_A);
3300 }
3301
3302 inline_size void
3303 ev_stop (EV_P_ W w)
3304 {
3305 ev_unref (EV_A);
3306 w->active = 0;
3307 }
3308
3309 /*****************************************************************************/
3310
3311 void noinline
3312 ev_io_start (EV_P_ ev_io *w) EV_THROW
3313 {
3314 int fd = w->fd;
3315
3316 if (expect_false (ev_is_active (w)))
3317 return;
3318
3319 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3320 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3321
3322 EV_FREQUENT_CHECK;
3323
3324 ev_start (EV_A_ (W)w, 1);
3325 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3326 wlist_add (&anfds[fd].head, (WL)w);
3327
3328 /* common bug, apparently */
3329 assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
3330
3331 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3332 w->events &= ~EV__IOFDSET;
3333
3334 EV_FREQUENT_CHECK;
3335 }
3336
3337 void noinline
3338 ev_io_stop (EV_P_ ev_io *w) EV_THROW
3339 {
3340 clear_pending (EV_A_ (W)w);
3341 if (expect_false (!ev_is_active (w)))
3342 return;
3343
3344 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3345
3346 EV_FREQUENT_CHECK;
3347
3348 wlist_del (&anfds[w->fd].head, (WL)w);
3349 ev_stop (EV_A_ (W)w);
3350
3351 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3352
3353 EV_FREQUENT_CHECK;
3354 }
3355
3356 void noinline
3357 ev_timer_start (EV_P_ ev_timer *w) EV_THROW
3358 {
3359 if (expect_false (ev_is_active (w)))
3360 return;
3361
3362 ev_at (w) += mn_now;
3363
3364 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3365
3366 EV_FREQUENT_CHECK;
3367
3368 ++timercnt;
3369 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3370 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3371 ANHE_w (timers [ev_active (w)]) = (WT)w;
3372 ANHE_at_cache (timers [ev_active (w)]);
3373 upheap (timers, ev_active (w));
3374
3375 EV_FREQUENT_CHECK;
3376
3377 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3378 }
3379
3380 void noinline
3381 ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
3382 {
3383 clear_pending (EV_A_ (W)w);
3384 if (expect_false (!ev_is_active (w)))
3385 return;
3386
3387 EV_FREQUENT_CHECK;
3388
3389 {
3390 int active = ev_active (w);
3391
3392 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3393
3394 --timercnt;
3395
3396 if (expect_true (active < timercnt + HEAP0))
3397 {
3398 timers [active] = timers [timercnt + HEAP0];
3399 adjustheap (timers, timercnt, active);
3400 }
3401 }
3402
3403 ev_at (w) -= mn_now;
3404
3405 ev_stop (EV_A_ (W)w);
3406
3407 EV_FREQUENT_CHECK;
3408 }
3409
3410 void noinline
3411 ev_timer_again (EV_P_ ev_timer *w) EV_THROW
3412 {
3413 EV_FREQUENT_CHECK;
3414
3415 clear_pending (EV_A_ (W)w);
3416
3417 if (ev_is_active (w))
3418 {
3419 if (w->repeat)
3420 {
3421 ev_at (w) = mn_now + w->repeat;
3422 ANHE_at_cache (timers [ev_active (w)]);
3423 adjustheap (timers, timercnt, ev_active (w));
3424 }
3425 else
3426 ev_timer_stop (EV_A_ w);
3427 }
3428 else if (w->repeat)
3429 {
3430 ev_at (w) = w->repeat;
3431 ev_timer_start (EV_A_ w);
3432 }
3433
3434 EV_FREQUENT_CHECK;
3435 }
3436
3437 ev_tstamp
3438 ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
3439 {
3440 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3441 }
3442
3443 #if EV_PERIODIC_ENABLE
3444 void noinline
3445 ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
3446 {
3447 if (expect_false (ev_is_active (w)))
3448 return;
3449
3450 if (w->reschedule_cb)
3451 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3452 else if (w->interval)
3453 {
3454 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3455 periodic_recalc (EV_A_ w);
3456 }
3457 else
3458 ev_at (w) = w->offset;
3459
3460 EV_FREQUENT_CHECK;
3461
3462 ++periodiccnt;
3463 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3464 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3465 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3466 ANHE_at_cache (periodics [ev_active (w)]);
3467 upheap (periodics, ev_active (w));
3468
3469 EV_FREQUENT_CHECK;
3470
3471 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3472 }
3473
3474 void noinline
3475 ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
3476 {
3477 clear_pending (EV_A_ (W)w);
3478 if (expect_false (!ev_is_active (w)))
3479 return;
3480
3481 EV_FREQUENT_CHECK;
3482
3483 {
3484 int active = ev_active (w);
3485
3486 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3487
3488 --periodiccnt;
3489
3490 if (expect_true (active < periodiccnt + HEAP0))
3491 {
3492 periodics [active] = periodics [periodiccnt + HEAP0];
3493 adjustheap (periodics, periodiccnt, active);
3494 }
3495 }
3496
3497 ev_stop (EV_A_ (W)w);
3498
3499 EV_FREQUENT_CHECK;
3500 }
3501
3502 void noinline
3503 ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
3504 {
3505 /* TODO: use adjustheap and recalculation */
3506 ev_periodic_stop (EV_A_ w);
3507 ev_periodic_start (EV_A_ w);
3508 }
3509 #endif
3510
3511 #ifndef SA_RESTART
3512 # define SA_RESTART 0
3513 #endif
3514
3515 #if EV_SIGNAL_ENABLE
3516
3517 void noinline
3518 ev_signal_start (EV_P_ ev_signal *w) EV_THROW
3519 {
3520 if (expect_false (ev_is_active (w)))
3521 return;
3522
3523 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3524
3525 #if EV_MULTIPLICITY
3526 assert (("libev: a signal must not be attached to two different loops",
3527 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3528
3529 signals [w->signum - 1].loop = EV_A;
3530 #endif
3531
3532 EV_FREQUENT_CHECK;
3533
3534 #if EV_USE_SIGNALFD
3535 if (sigfd == -2)
3536 {
3537 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3538 if (sigfd < 0 && errno == EINVAL)
3539 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3540
3541 if (sigfd >= 0)
3542 {
3543 fd_intern (sigfd); /* doing it twice will not hurt */
3544
3545 sigemptyset (&sigfd_set);
3546
3547 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3548 ev_set_priority (&sigfd_w, EV_MAXPRI);
3549 ev_io_start (EV_A_ &sigfd_w);
3550 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3551 }
3552 }
3553
3554 if (sigfd >= 0)
3555 {
3556 /* TODO: check .head */
3557 sigaddset (&sigfd_set, w->signum);
3558 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3559
3560 signalfd (sigfd, &sigfd_set, 0);
3561 }
3562 #endif
3563
3564 ev_start (EV_A_ (W)w, 1);
3565 wlist_add (&signals [w->signum - 1].head, (WL)w);
3566
3567 if (!((WL)w)->next)
3568 # if EV_USE_SIGNALFD
3569 if (sigfd < 0) /*TODO*/
3570 # endif
3571 {
3572 # ifdef _WIN32
3573 evpipe_init (EV_A);
3574
3575 signal (w->signum, ev_sighandler);
3576 # else
3577 struct sigaction sa;
3578
3579 evpipe_init (EV_A);
3580
3581 sa.sa_handler = ev_sighandler;
3582 sigfillset (&sa.sa_mask);
3583 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3584 sigaction (w->signum, &sa, 0);
3585
3586 if (origflags & EVFLAG_NOSIGMASK)
3587 {
3588 sigemptyset (&sa.sa_mask);
3589 sigaddset (&sa.sa_mask, w->signum);
3590 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3591 }
3592 #endif
3593 }
3594
3595 EV_FREQUENT_CHECK;
3596 }
3597
3598 void noinline
3599 ev_signal_stop (EV_P_ ev_signal *w) EV_THROW
3600 {
3601 clear_pending (EV_A_ (W)w);
3602 if (expect_false (!ev_is_active (w)))
3603 return;
3604
3605 EV_FREQUENT_CHECK;
3606
3607 wlist_del (&signals [w->signum - 1].head, (WL)w);
3608 ev_stop (EV_A_ (W)w);
3609
3610 if (!signals [w->signum - 1].head)
3611 {
3612 #if EV_MULTIPLICITY
3613 signals [w->signum - 1].loop = 0; /* unattach from signal */
3614 #endif
3615 #if EV_USE_SIGNALFD
3616 if (sigfd >= 0)
3617 {
3618 sigset_t ss;
3619
3620 sigemptyset (&ss);
3621 sigaddset (&ss, w->signum);
3622 sigdelset (&sigfd_set, w->signum);
3623
3624 signalfd (sigfd, &sigfd_set, 0);
3625 sigprocmask (SIG_UNBLOCK, &ss, 0);
3626 }
3627 else
3628 #endif
3629 signal (w->signum, SIG_DFL);
3630 }
3631
3632 EV_FREQUENT_CHECK;
3633 }
3634
3635 #endif
3636
3637 #if EV_CHILD_ENABLE
3638
3639 void
3640 ev_child_start (EV_P_ ev_child *w) EV_THROW
3641 {
3642 #if EV_MULTIPLICITY
3643 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3644 #endif
3645 if (expect_false (ev_is_active (w)))
3646 return;
3647
3648 EV_FREQUENT_CHECK;
3649
3650 ev_start (EV_A_ (W)w, 1);
3651 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3652
3653 EV_FREQUENT_CHECK;
3654 }
3655
3656 void
3657 ev_child_stop (EV_P_ ev_child *w) EV_THROW
3658 {
3659 clear_pending (EV_A_ (W)w);
3660 if (expect_false (!ev_is_active (w)))
3661 return;
3662
3663 EV_FREQUENT_CHECK;
3664
3665 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3666 ev_stop (EV_A_ (W)w);
3667
3668 EV_FREQUENT_CHECK;
3669 }
3670
3671 #endif
3672
3673 #if EV_STAT_ENABLE
3674
3675 # ifdef _WIN32
3676 # undef lstat
3677 # define lstat(a,b) _stati64 (a,b)
3678 # endif
3679
3680 #define DEF_STAT_INTERVAL 5.0074891
3681 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3682 #define MIN_STAT_INTERVAL 0.1074891
3683
3684 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3685
3686 #if EV_USE_INOTIFY
3687
3688 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3689 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3690
3691 static void noinline
3692 infy_add (EV_P_ ev_stat *w)
3693 {
3694 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);
3695
3696 if (w->wd >= 0)
3697 {
3698 struct statfs sfs;
3699
3700 /* now local changes will be tracked by inotify, but remote changes won't */
3701 /* unless the filesystem is known to be local, we therefore still poll */
3702 /* also do poll on <2.6.25, but with normal frequency */
3703
3704 if (!fs_2625)
3705 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3706 else if (!statfs (w->path, &sfs)
3707 && (sfs.f_type == 0x1373 /* devfs */
3708 || sfs.f_type == 0xEF53 /* ext2/3 */
3709 || sfs.f_type == 0x3153464a /* jfs */
3710 || sfs.f_type == 0x52654973 /* reiser3 */
3711 || sfs.f_type == 0x01021994 /* tempfs */
3712 || sfs.f_type == 0x58465342 /* xfs */))
3713 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3714 else
3715 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3716 }
3717 else
3718 {
3719 /* can't use inotify, continue to stat */
3720 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3721
3722 /* if path is not there, monitor some parent directory for speedup hints */
3723 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3724 /* but an efficiency issue only */
3725 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3726 {
3727 char path [4096];
3728 strcpy (path, w->path);
3729
3730 do
3731 {
3732 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3733 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3734
3735 char *pend = strrchr (path, '/');
3736
3737 if (!pend || pend == path)
3738 break;
3739
3740 *pend = 0;
3741 w->wd = inotify_add_watch (fs_fd, path, mask);
3742 }
3743 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3744 }
3745 }
3746
3747 if (w->wd >= 0)
3748 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3749
3750 /* now re-arm timer, if required */
3751 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3752 ev_timer_again (EV_A_ &w->timer);
3753 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3754 }
3755
3756 static void noinline
3757 infy_del (EV_P_ ev_stat *w)
3758 {
3759 int slot;
3760 int wd = w->wd;
3761
3762 if (wd < 0)
3763 return;
3764
3765 w->wd = -2;
3766 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3767 wlist_del (&fs_hash [slot].head, (WL)w);
3768
3769 /* remove this watcher, if others are watching it, they will rearm */
3770 inotify_rm_watch (fs_fd, wd);
3771 }
3772
3773 static void noinline
3774 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3775 {
3776 if (slot < 0)
3777 /* overflow, need to check for all hash slots */
3778 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3779 infy_wd (EV_A_ slot, wd, ev);
3780 else
3781 {
3782 WL w_;
3783
3784 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3785 {
3786 ev_stat *w = (ev_stat *)w_;
3787 w_ = w_->next; /* lets us remove this watcher and all before it */
3788
3789 if (w->wd == wd || wd == -1)
3790 {
3791 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3792 {
3793 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3794 w->wd = -1;
3795 infy_add (EV_A_ w); /* re-add, no matter what */
3796 }
3797
3798 stat_timer_cb (EV_A_ &w->timer, 0);
3799 }
3800 }
3801 }
3802 }
3803
3804 static void
3805 infy_cb (EV_P_ ev_io *w, int revents)
3806 {
3807 char buf [EV_INOTIFY_BUFSIZE];
3808 int ofs;
3809 int len = read (fs_fd, buf, sizeof (buf));
3810
3811 for (ofs = 0; ofs < len; )
3812 {
3813 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3814 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3815 ofs += sizeof (struct inotify_event) + ev->len;
3816 }
3817 }
3818
3819 inline_size void ecb_cold
3820 ev_check_2625 (EV_P)
3821 {
3822 /* kernels < 2.6.25 are borked
3823 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3824 */
3825 if (ev_linux_version () < 0x020619)
3826 return;
3827
3828 fs_2625 = 1;
3829 }
3830
3831 inline_size int
3832 infy_newfd (void)
3833 {
3834 #if defined IN_CLOEXEC && defined IN_NONBLOCK
3835 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3836 if (fd >= 0)
3837 return fd;
3838 #endif
3839 return inotify_init ();
3840 }
3841
3842 inline_size void
3843 infy_init (EV_P)
3844 {
3845 if (fs_fd != -2)
3846 return;
3847
3848 fs_fd = -1;
3849
3850 ev_check_2625 (EV_A);
3851
3852 fs_fd = infy_newfd ();
3853
3854 if (fs_fd >= 0)
3855 {
3856 fd_intern (fs_fd);
3857 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3858 ev_set_priority (&fs_w, EV_MAXPRI);
3859 ev_io_start (EV_A_ &fs_w);
3860 ev_unref (EV_A);
3861 }
3862 }
3863
3864 inline_size void
3865 infy_fork (EV_P)
3866 {
3867 int slot;
3868
3869 if (fs_fd < 0)
3870 return;
3871
3872 ev_ref (EV_A);
3873 ev_io_stop (EV_A_ &fs_w);
3874 close (fs_fd);
3875 fs_fd = infy_newfd ();
3876
3877 if (fs_fd >= 0)
3878 {
3879 fd_intern (fs_fd);
3880 ev_io_set (&fs_w, fs_fd, EV_READ);
3881 ev_io_start (EV_A_ &fs_w);
3882 ev_unref (EV_A);
3883 }
3884
3885 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3886 {
3887 WL w_ = fs_hash [slot].head;
3888 fs_hash [slot].head = 0;
3889
3890 while (w_)
3891 {
3892 ev_stat *w = (ev_stat *)w_;
3893 w_ = w_->next; /* lets us add this watcher */
3894
3895 w->wd = -1;
3896
3897 if (fs_fd >= 0)
3898 infy_add (EV_A_ w); /* re-add, no matter what */
3899 else
3900 {
3901 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3902 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3903 ev_timer_again (EV_A_ &w->timer);
3904 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3905 }
3906 }
3907 }
3908 }
3909
3910 #endif
3911
3912 #ifdef _WIN32
3913 # define EV_LSTAT(p,b) _stati64 (p, b)
3914 #else
3915 # define EV_LSTAT(p,b) lstat (p, b)
3916 #endif
3917
3918 void
3919 ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
3920 {
3921 if (lstat (w->path, &w->attr) < 0)
3922 w->attr.st_nlink = 0;
3923 else if (!w->attr.st_nlink)
3924 w->attr.st_nlink = 1;
3925 }
3926
3927 static void noinline
3928 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3929 {
3930 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3931
3932 ev_statdata prev = w->attr;
3933 ev_stat_stat (EV_A_ w);
3934
3935 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3936 if (
3937 prev.st_dev != w->attr.st_dev
3938 || prev.st_ino != w->attr.st_ino
3939 || prev.st_mode != w->attr.st_mode
3940 || prev.st_nlink != w->attr.st_nlink
3941 || prev.st_uid != w->attr.st_uid
3942 || prev.st_gid != w->attr.st_gid
3943 || prev.st_rdev != w->attr.st_rdev
3944 || prev.st_size != w->attr.st_size
3945 || prev.st_atime != w->attr.st_atime
3946 || prev.st_mtime != w->attr.st_mtime
3947 || prev.st_ctime != w->attr.st_ctime
3948 ) {
3949 /* we only update w->prev on actual differences */
3950 /* in case we test more often than invoke the callback, */
3951 /* to ensure that prev is always different to attr */
3952 w->prev = prev;
3953
3954 #if EV_USE_INOTIFY
3955 if (fs_fd >= 0)
3956 {
3957 infy_del (EV_A_ w);
3958 infy_add (EV_A_ w);
3959 ev_stat_stat (EV_A_ w); /* avoid race... */
3960 }
3961 #endif
3962
3963 ev_feed_event (EV_A_ w, EV_STAT);
3964 }
3965 }
3966
3967 void
3968 ev_stat_start (EV_P_ ev_stat *w) EV_THROW
3969 {
3970 if (expect_false (ev_is_active (w)))
3971 return;
3972
3973 ev_stat_stat (EV_A_ w);
3974
3975 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3976 w->interval = MIN_STAT_INTERVAL;
3977
3978 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3979 ev_set_priority (&w->timer, ev_priority (w));
3980
3981 #if EV_USE_INOTIFY
3982 infy_init (EV_A);
3983
3984 if (fs_fd >= 0)
3985 infy_add (EV_A_ w);
3986 else
3987 #endif
3988 {
3989 ev_timer_again (EV_A_ &w->timer);
3990 ev_unref (EV_A);
3991 }
3992
3993 ev_start (EV_A_ (W)w, 1);
3994
3995 EV_FREQUENT_CHECK;
3996 }
3997
3998 void
3999 ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
4000 {
4001 clear_pending (EV_A_ (W)w);
4002 if (expect_false (!ev_is_active (w)))
4003 return;
4004
4005 EV_FREQUENT_CHECK;
4006
4007 #if EV_USE_INOTIFY
4008 infy_del (EV_A_ w);
4009 #endif
4010
4011 if (ev_is_active (&w->timer))
4012 {
4013 ev_ref (EV_A);
4014 ev_timer_stop (EV_A_ &w->timer);
4015 }
4016
4017 ev_stop (EV_A_ (W)w);
4018
4019 EV_FREQUENT_CHECK;
4020 }
4021 #endif
4022
4023 #if EV_IDLE_ENABLE
4024 void
4025 ev_idle_start (EV_P_ ev_idle *w) EV_THROW
4026 {
4027 if (expect_false (ev_is_active (w)))
4028 return;
4029
4030 pri_adjust (EV_A_ (W)w);
4031
4032 EV_FREQUENT_CHECK;
4033
4034 {
4035 int active = ++idlecnt [ABSPRI (w)];
4036
4037 ++idleall;
4038 ev_start (EV_A_ (W)w, active);
4039
4040 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
4041 idles [ABSPRI (w)][active - 1] = w;
4042 }
4043
4044 EV_FREQUENT_CHECK;
4045 }
4046
4047 void
4048 ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
4049 {
4050 clear_pending (EV_A_ (W)w);
4051 if (expect_false (!ev_is_active (w)))
4052 return;
4053
4054 EV_FREQUENT_CHECK;
4055
4056 {
4057 int active = ev_active (w);
4058
4059 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
4060 ev_active (idles [ABSPRI (w)][active - 1]) = active;
4061
4062 ev_stop (EV_A_ (W)w);
4063 --idleall;
4064 }
4065
4066 EV_FREQUENT_CHECK;
4067 }
4068 #endif
4069
4070 #if EV_PREPARE_ENABLE
4071 void
4072 ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
4073 {
4074 if (expect_false (ev_is_active (w)))
4075 return;
4076
4077 EV_FREQUENT_CHECK;
4078
4079 ev_start (EV_A_ (W)w, ++preparecnt);
4080 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
4081 prepares [preparecnt - 1] = w;
4082
4083 EV_FREQUENT_CHECK;
4084 }
4085
4086 void
4087 ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
4088 {
4089 clear_pending (EV_A_ (W)w);
4090 if (expect_false (!ev_is_active (w)))
4091 return;
4092
4093 EV_FREQUENT_CHECK;
4094
4095 {
4096 int active = ev_active (w);
4097
4098 prepares [active - 1] = prepares [--preparecnt];
4099 ev_active (prepares [active - 1]) = active;
4100 }
4101
4102 ev_stop (EV_A_ (W)w);
4103
4104 EV_FREQUENT_CHECK;
4105 }
4106 #endif
4107
4108 #if EV_CHECK_ENABLE
4109 void
4110 ev_check_start (EV_P_ ev_check *w) EV_THROW
4111 {
4112 if (expect_false (ev_is_active (w)))
4113 return;
4114
4115 EV_FREQUENT_CHECK;
4116
4117 ev_start (EV_A_ (W)w, ++checkcnt);
4118 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4119 checks [checkcnt - 1] = w;
4120
4121 EV_FREQUENT_CHECK;
4122 }
4123
4124 void
4125 ev_check_stop (EV_P_ ev_check *w) EV_THROW
4126 {
4127 clear_pending (EV_A_ (W)w);
4128 if (expect_false (!ev_is_active (w)))
4129 return;
4130
4131 EV_FREQUENT_CHECK;
4132
4133 {
4134 int active = ev_active (w);
4135
4136 checks [active - 1] = checks [--checkcnt];
4137 ev_active (checks [active - 1]) = active;
4138 }
4139
4140 ev_stop (EV_A_ (W)w);
4141
4142 EV_FREQUENT_CHECK;
4143 }
4144 #endif
4145
4146 #if EV_EMBED_ENABLE
4147 void noinline
4148 ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
4149 {
4150 ev_run (w->other, EVRUN_NOWAIT);
4151 }
4152
4153 static void
4154 embed_io_cb (EV_P_ ev_io *io, int revents)
4155 {
4156 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4157
4158 if (ev_cb (w))
4159 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4160 else
4161 ev_run (w->other, EVRUN_NOWAIT);
4162 }
4163
4164 static void
4165 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4166 {
4167 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4168
4169 {
4170 EV_P = w->other;
4171
4172 while (fdchangecnt)
4173 {
4174 fd_reify (EV_A);
4175 ev_run (EV_A_ EVRUN_NOWAIT);
4176 }
4177 }
4178 }
4179
4180 static void
4181 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4182 {
4183 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4184
4185 ev_embed_stop (EV_A_ w);
4186
4187 {
4188 EV_P = w->other;
4189
4190 ev_loop_fork (EV_A);
4191 ev_run (EV_A_ EVRUN_NOWAIT);
4192 }
4193
4194 ev_embed_start (EV_A_ w);
4195 }
4196
4197 #if 0
4198 static void
4199 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4200 {
4201 ev_idle_stop (EV_A_ idle);
4202 }
4203 #endif
4204
4205 void
4206 ev_embed_start (EV_P_ ev_embed *w) EV_THROW
4207 {
4208 if (expect_false (ev_is_active (w)))
4209 return;
4210
4211 {
4212 EV_P = w->other;
4213 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4214 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4215 }
4216
4217 EV_FREQUENT_CHECK;
4218
4219 ev_set_priority (&w->io, ev_priority (w));
4220 ev_io_start (EV_A_ &w->io);
4221
4222 ev_prepare_init (&w->prepare, embed_prepare_cb);
4223 ev_set_priority (&w->prepare, EV_MINPRI);
4224 ev_prepare_start (EV_A_ &w->prepare);
4225
4226 ev_fork_init (&w->fork, embed_fork_cb);
4227 ev_fork_start (EV_A_ &w->fork);
4228
4229 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4230
4231 ev_start (EV_A_ (W)w, 1);
4232
4233 EV_FREQUENT_CHECK;
4234 }
4235
4236 void
4237 ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
4238 {
4239 clear_pending (EV_A_ (W)w);
4240 if (expect_false (!ev_is_active (w)))
4241 return;
4242
4243 EV_FREQUENT_CHECK;
4244
4245 ev_io_stop (EV_A_ &w->io);
4246 ev_prepare_stop (EV_A_ &w->prepare);
4247 ev_fork_stop (EV_A_ &w->fork);
4248
4249 ev_stop (EV_A_ (W)w);
4250
4251 EV_FREQUENT_CHECK;
4252 }
4253 #endif
4254
4255 #if EV_FORK_ENABLE
4256 void
4257 ev_fork_start (EV_P_ ev_fork *w) EV_THROW
4258 {
4259 if (expect_false (ev_is_active (w)))
4260 return;
4261
4262 EV_FREQUENT_CHECK;
4263
4264 ev_start (EV_A_ (W)w, ++forkcnt);
4265 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4266 forks [forkcnt - 1] = w;
4267
4268 EV_FREQUENT_CHECK;
4269 }
4270
4271 void
4272 ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
4273 {
4274 clear_pending (EV_A_ (W)w);
4275 if (expect_false (!ev_is_active (w)))
4276 return;
4277
4278 EV_FREQUENT_CHECK;
4279
4280 {
4281 int active = ev_active (w);
4282
4283 forks [active - 1] = forks [--forkcnt];
4284 ev_active (forks [active - 1]) = active;
4285 }
4286
4287 ev_stop (EV_A_ (W)w);
4288
4289 EV_FREQUENT_CHECK;
4290 }
4291 #endif
4292
4293 #if EV_CLEANUP_ENABLE
4294 void
4295 ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
4296 {
4297 if (expect_false (ev_is_active (w)))
4298 return;
4299
4300 EV_FREQUENT_CHECK;
4301
4302 ev_start (EV_A_ (W)w, ++cleanupcnt);
4303 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4304 cleanups [cleanupcnt - 1] = w;
4305
4306 /* cleanup watchers should never keep a refcount on the loop */
4307 ev_unref (EV_A);
4308 EV_FREQUENT_CHECK;
4309 }
4310
4311 void
4312 ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
4313 {
4314 clear_pending (EV_A_ (W)w);
4315 if (expect_false (!ev_is_active (w)))
4316 return;
4317
4318 EV_FREQUENT_CHECK;
4319 ev_ref (EV_A);
4320
4321 {
4322 int active = ev_active (w);
4323
4324 cleanups [active - 1] = cleanups [--cleanupcnt];
4325 ev_active (cleanups [active - 1]) = active;
4326 }
4327
4328 ev_stop (EV_A_ (W)w);
4329
4330 EV_FREQUENT_CHECK;
4331 }
4332 #endif
4333
4334 #if EV_ASYNC_ENABLE
4335 void
4336 ev_async_start (EV_P_ ev_async *w) EV_THROW
4337 {
4338 if (expect_false (ev_is_active (w)))
4339 return;
4340
4341 w->sent = 0;
4342
4343 evpipe_init (EV_A);
4344
4345 EV_FREQUENT_CHECK;
4346
4347 ev_start (EV_A_ (W)w, ++asynccnt);
4348 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4349 asyncs [asynccnt - 1] = w;
4350
4351 EV_FREQUENT_CHECK;
4352 }
4353
4354 void
4355 ev_async_stop (EV_P_ ev_async *w) EV_THROW
4356 {
4357 clear_pending (EV_A_ (W)w);
4358 if (expect_false (!ev_is_active (w)))
4359 return;
4360
4361 EV_FREQUENT_CHECK;
4362
4363 {
4364 int active = ev_active (w);
4365
4366 asyncs [active - 1] = asyncs [--asynccnt];
4367 ev_active (asyncs [active - 1]) = active;
4368 }
4369
4370 ev_stop (EV_A_ (W)w);
4371
4372 EV_FREQUENT_CHECK;
4373 }
4374
4375 void
4376 ev_async_send (EV_P_ ev_async *w) EV_THROW
4377 {
4378 w->sent = 1;
4379 evpipe_write (EV_A_ &async_pending);
4380 }
4381 #endif
4382
4383 /*****************************************************************************/
4384
4385 struct ev_once
4386 {
4387 ev_io io;
4388 ev_timer to;
4389 void (*cb)(int revents, void *arg);
4390 void *arg;
4391 };
4392
4393 static void
4394 once_cb (EV_P_ struct ev_once *once, int revents)
4395 {
4396 void (*cb)(int revents, void *arg) = once->cb;
4397 void *arg = once->arg;
4398
4399 ev_io_stop (EV_A_ &once->io);
4400 ev_timer_stop (EV_A_ &once->to);
4401 ev_free (once);
4402
4403 cb (revents, arg);
4404 }
4405
4406 static void
4407 once_cb_io (EV_P_ ev_io *w, int revents)
4408 {
4409 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4410
4411 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4412 }
4413
4414 static void
4415 once_cb_to (EV_P_ ev_timer *w, int revents)
4416 {
4417 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4418
4419 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4420 }
4421
4422 void
4423 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
4424 {
4425 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4426
4427 if (expect_false (!once))
4428 {
4429 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4430 return;
4431 }
4432
4433 once->cb = cb;
4434 once->arg = arg;
4435
4436 ev_init (&once->io, once_cb_io);
4437 if (fd >= 0)
4438 {
4439 ev_io_set (&once->io, fd, events);
4440 ev_io_start (EV_A_ &once->io);
4441 }
4442
4443 ev_init (&once->to, once_cb_to);
4444 if (timeout >= 0.)
4445 {
4446 ev_timer_set (&once->to, timeout, 0.);
4447 ev_timer_start (EV_A_ &once->to);
4448 }
4449 }
4450
4451 /*****************************************************************************/
4452
4453 #if EV_WALK_ENABLE
4454 void ecb_cold
4455 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
4456 {
4457 int i, j;
4458 ev_watcher_list *wl, *wn;
4459
4460 if (types & (EV_IO | EV_EMBED))
4461 for (i = 0; i < anfdmax; ++i)
4462 for (wl = anfds [i].head; wl; )
4463 {
4464 wn = wl->next;
4465
4466 #if EV_EMBED_ENABLE
4467 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4468 {
4469 if (types & EV_EMBED)
4470 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4471 }
4472 else
4473 #endif
4474 #if EV_USE_INOTIFY
4475 if (ev_cb ((ev_io *)wl) == infy_cb)
4476 ;
4477 else
4478 #endif
4479 if ((ev_io *)wl != &pipe_w)
4480 if (types & EV_IO)
4481 cb (EV_A_ EV_IO, wl);
4482
4483 wl = wn;
4484 }
4485
4486 if (types & (EV_TIMER | EV_STAT))
4487 for (i = timercnt + HEAP0; i-- > HEAP0; )
4488 #if EV_STAT_ENABLE
4489 /*TODO: timer is not always active*/
4490 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
4491 {
4492 if (types & EV_STAT)
4493 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
4494 }
4495 else
4496 #endif
4497 if (types & EV_TIMER)
4498 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
4499
4500 #if EV_PERIODIC_ENABLE
4501 if (types & EV_PERIODIC)
4502 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4503 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4504 #endif
4505
4506 #if EV_IDLE_ENABLE
4507 if (types & EV_IDLE)
4508 for (j = NUMPRI; j--; )
4509 for (i = idlecnt [j]; i--; )
4510 cb (EV_A_ EV_IDLE, idles [j][i]);
4511 #endif
4512
4513 #if EV_FORK_ENABLE
4514 if (types & EV_FORK)
4515 for (i = forkcnt; i--; )
4516 if (ev_cb (forks [i]) != embed_fork_cb)
4517 cb (EV_A_ EV_FORK, forks [i]);
4518 #endif
4519
4520 #if EV_ASYNC_ENABLE
4521 if (types & EV_ASYNC)
4522 for (i = asynccnt; i--; )
4523 cb (EV_A_ EV_ASYNC, asyncs [i]);
4524 #endif
4525
4526 #if EV_PREPARE_ENABLE
4527 if (types & EV_PREPARE)
4528 for (i = preparecnt; i--; )
4529 # if EV_EMBED_ENABLE
4530 if (ev_cb (prepares [i]) != embed_prepare_cb)
4531 # endif
4532 cb (EV_A_ EV_PREPARE, prepares [i]);
4533 #endif
4534
4535 #if EV_CHECK_ENABLE
4536 if (types & EV_CHECK)
4537 for (i = checkcnt; i--; )
4538 cb (EV_A_ EV_CHECK, checks [i]);
4539 #endif
4540
4541 #if EV_SIGNAL_ENABLE
4542 if (types & EV_SIGNAL)
4543 for (i = 0; i < EV_NSIG - 1; ++i)
4544 for (wl = signals [i].head; wl; )
4545 {
4546 wn = wl->next;
4547 cb (EV_A_ EV_SIGNAL, wl);
4548 wl = wn;
4549 }
4550 #endif
4551
4552 #if EV_CHILD_ENABLE
4553 if (types & EV_CHILD)
4554 for (i = (EV_PID_HASHSIZE); i--; )
4555 for (wl = childs [i]; wl; )
4556 {
4557 wn = wl->next;
4558 cb (EV_A_ EV_CHILD, wl);
4559 wl = wn;
4560 }
4561 #endif
4562 /* EV_STAT 0x00001000 /* stat data changed */
4563 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4564 }
4565 #endif
4566
4567 #if EV_MULTIPLICITY
4568 #include "ev_wrap.h"
4569 #endif
4570