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Revision: 1.491
Committed: Thu Jun 20 23:14:53 2019 UTC (5 years, 1 month ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.490: +20 -0 lines
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# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007-2019 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_LINUX_AIO_ABI_H
121 # ifndef EV_USE_LINUXAIO
122 # define EV_USE_LINUXAIO EV_FEATURE_BACKENDS
123 # endif
124 # else
125 # undef EV_USE_LINUXAIO
126 # define EV_USE_LINUXAIO 0
127 # endif
128
129 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
130 # ifndef EV_USE_KQUEUE
131 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
132 # endif
133 # else
134 # undef EV_USE_KQUEUE
135 # define EV_USE_KQUEUE 0
136 # endif
137
138 # if HAVE_PORT_H && HAVE_PORT_CREATE
139 # ifndef EV_USE_PORT
140 # define EV_USE_PORT EV_FEATURE_BACKENDS
141 # endif
142 # else
143 # undef EV_USE_PORT
144 # define EV_USE_PORT 0
145 # endif
146
147 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
148 # ifndef EV_USE_INOTIFY
149 # define EV_USE_INOTIFY EV_FEATURE_OS
150 # endif
151 # else
152 # undef EV_USE_INOTIFY
153 # define EV_USE_INOTIFY 0
154 # endif
155
156 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
157 # ifndef EV_USE_SIGNALFD
158 # define EV_USE_SIGNALFD EV_FEATURE_OS
159 # endif
160 # else
161 # undef EV_USE_SIGNALFD
162 # define EV_USE_SIGNALFD 0
163 # endif
164
165 # if HAVE_EVENTFD
166 # ifndef EV_USE_EVENTFD
167 # define EV_USE_EVENTFD EV_FEATURE_OS
168 # endif
169 # else
170 # undef EV_USE_EVENTFD
171 # define EV_USE_EVENTFD 0
172 # endif
173
174 #endif
175
176 /* OS X, in its infinite idiocy, actually HARDCODES
177 * a limit of 1024 into their select. Where people have brains,
178 * OS X engineers apparently have a vacuum. Or maybe they were
179 * ordered to have a vacuum, or they do anything for money.
180 * This might help. Or not.
181 * Note that this must be defined early, as other include files
182 * will rely on this define as well.
183 */
184 #define _DARWIN_UNLIMITED_SELECT 1
185
186 #include <stdlib.h>
187 #include <string.h>
188 #include <fcntl.h>
189 #include <stddef.h>
190
191 #include <stdio.h>
192
193 #include <assert.h>
194 #include <errno.h>
195 #include <sys/types.h>
196 #include <time.h>
197 #include <limits.h>
198
199 #include <signal.h>
200
201 #ifdef EV_H
202 # include EV_H
203 #else
204 # include "ev.h"
205 #endif
206
207 #if EV_NO_THREADS
208 # undef EV_NO_SMP
209 # define EV_NO_SMP 1
210 # undef ECB_NO_THREADS
211 # define ECB_NO_THREADS 1
212 #endif
213 #if EV_NO_SMP
214 # undef EV_NO_SMP
215 # define ECB_NO_SMP 1
216 #endif
217
218 #ifndef _WIN32
219 # include <sys/time.h>
220 # include <sys/wait.h>
221 # include <unistd.h>
222 #else
223 # include <io.h>
224 # define WIN32_LEAN_AND_MEAN
225 # include <winsock2.h>
226 # include <windows.h>
227 # ifndef EV_SELECT_IS_WINSOCKET
228 # define EV_SELECT_IS_WINSOCKET 1
229 # endif
230 # undef EV_AVOID_STDIO
231 #endif
232
233 /* this block tries to deduce configuration from header-defined symbols and defaults */
234
235 /* try to deduce the maximum number of signals on this platform */
236 #if defined EV_NSIG
237 /* use what's provided */
238 #elif defined NSIG
239 # define EV_NSIG (NSIG)
240 #elif defined _NSIG
241 # define EV_NSIG (_NSIG)
242 #elif defined SIGMAX
243 # define EV_NSIG (SIGMAX+1)
244 #elif defined SIG_MAX
245 # define EV_NSIG (SIG_MAX+1)
246 #elif defined _SIG_MAX
247 # define EV_NSIG (_SIG_MAX+1)
248 #elif defined MAXSIG
249 # define EV_NSIG (MAXSIG+1)
250 #elif defined MAX_SIG
251 # define EV_NSIG (MAX_SIG+1)
252 #elif defined SIGARRAYSIZE
253 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
254 #elif defined _sys_nsig
255 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
256 #else
257 # define EV_NSIG (8 * sizeof (sigset_t) + 1)
258 #endif
259
260 #ifndef EV_USE_FLOOR
261 # define EV_USE_FLOOR 0
262 #endif
263
264 #ifndef EV_USE_CLOCK_SYSCALL
265 # if __linux && __GLIBC__ == 2 && __GLIBC_MINOR__ < 17
266 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
267 # else
268 # define EV_USE_CLOCK_SYSCALL 0
269 # endif
270 #endif
271
272 #if !(_POSIX_TIMERS > 0)
273 # ifndef EV_USE_MONOTONIC
274 # define EV_USE_MONOTONIC 0
275 # endif
276 # ifndef EV_USE_REALTIME
277 # define EV_USE_REALTIME 0
278 # endif
279 #endif
280
281 #ifndef EV_USE_MONOTONIC
282 # if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
283 # define EV_USE_MONOTONIC EV_FEATURE_OS
284 # else
285 # define EV_USE_MONOTONIC 0
286 # endif
287 #endif
288
289 #ifndef EV_USE_REALTIME
290 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
291 #endif
292
293 #ifndef EV_USE_NANOSLEEP
294 # if _POSIX_C_SOURCE >= 199309L
295 # define EV_USE_NANOSLEEP EV_FEATURE_OS
296 # else
297 # define EV_USE_NANOSLEEP 0
298 # endif
299 #endif
300
301 #ifndef EV_USE_SELECT
302 # define EV_USE_SELECT EV_FEATURE_BACKENDS
303 #endif
304
305 #ifndef EV_USE_POLL
306 # ifdef _WIN32
307 # define EV_USE_POLL 0
308 # else
309 # define EV_USE_POLL EV_FEATURE_BACKENDS
310 # endif
311 #endif
312
313 #ifndef EV_USE_EPOLL
314 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
315 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
316 # else
317 # define EV_USE_EPOLL 0
318 # endif
319 #endif
320
321 #ifndef EV_USE_KQUEUE
322 # define EV_USE_KQUEUE 0
323 #endif
324
325 #ifndef EV_USE_PORT
326 # define EV_USE_PORT 0
327 #endif
328
329 #ifndef EV_USE_LINUXAIO
330 # define EV_USE_LINUXAIO 0
331 #endif
332
333 #ifndef EV_USE_INOTIFY
334 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
335 # define EV_USE_INOTIFY EV_FEATURE_OS
336 # else
337 # define EV_USE_INOTIFY 0
338 # endif
339 #endif
340
341 #ifndef EV_PID_HASHSIZE
342 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
343 #endif
344
345 #ifndef EV_INOTIFY_HASHSIZE
346 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
347 #endif
348
349 #ifndef EV_USE_EVENTFD
350 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
351 # define EV_USE_EVENTFD EV_FEATURE_OS
352 # else
353 # define EV_USE_EVENTFD 0
354 # endif
355 #endif
356
357 #ifndef EV_USE_SIGNALFD
358 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
359 # define EV_USE_SIGNALFD EV_FEATURE_OS
360 # else
361 # define EV_USE_SIGNALFD 0
362 # endif
363 #endif
364
365 #if 0 /* debugging */
366 # define EV_VERIFY 3
367 # define EV_USE_4HEAP 1
368 # define EV_HEAP_CACHE_AT 1
369 #endif
370
371 #ifndef EV_VERIFY
372 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
373 #endif
374
375 #ifndef EV_USE_4HEAP
376 # define EV_USE_4HEAP EV_FEATURE_DATA
377 #endif
378
379 #ifndef EV_HEAP_CACHE_AT
380 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
381 #endif
382
383 #ifdef __ANDROID__
384 /* supposedly, android doesn't typedef fd_mask */
385 # undef EV_USE_SELECT
386 # define EV_USE_SELECT 0
387 /* supposedly, we need to include syscall.h, not sys/syscall.h, so just disable */
388 # undef EV_USE_CLOCK_SYSCALL
389 # define EV_USE_CLOCK_SYSCALL 0
390 #endif
391
392 /* aix's poll.h seems to cause lots of trouble */
393 #ifdef _AIX
394 /* AIX has a completely broken poll.h header */
395 # undef EV_USE_POLL
396 # define EV_USE_POLL 0
397 #endif
398
399 #if EV_USE_LINUXAIO
400 # include <linux/aio_abi.h> /* probably only needed for aio_context_t */
401 #endif
402
403 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
404 /* which makes programs even slower. might work on other unices, too. */
405 #if EV_USE_CLOCK_SYSCALL
406 # include <sys/syscall.h>
407 # ifdef SYS_clock_gettime
408 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
409 # undef EV_USE_MONOTONIC
410 # define EV_USE_MONOTONIC 1
411 # else
412 # undef EV_USE_CLOCK_SYSCALL
413 # define EV_USE_CLOCK_SYSCALL 0
414 # endif
415 #endif
416
417 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
418
419 #ifndef CLOCK_MONOTONIC
420 # undef EV_USE_MONOTONIC
421 # define EV_USE_MONOTONIC 0
422 #endif
423
424 #ifndef CLOCK_REALTIME
425 # undef EV_USE_REALTIME
426 # define EV_USE_REALTIME 0
427 #endif
428
429 #if !EV_STAT_ENABLE
430 # undef EV_USE_INOTIFY
431 # define EV_USE_INOTIFY 0
432 #endif
433
434 #if !EV_USE_NANOSLEEP
435 /* hp-ux has it in sys/time.h, which we unconditionally include above */
436 # if !defined _WIN32 && !defined __hpux
437 # include <sys/select.h>
438 # endif
439 #endif
440
441 #if EV_USE_LINUXAIO
442 # include <sys/syscall.h>
443 # if !SYS_io_getevents
444 # undef EV_USE_LINUXAIO
445 # define EV_USE_LINUXAIO 0
446 # endif
447 #endif
448
449 #if EV_USE_INOTIFY
450 # include <sys/statfs.h>
451 # include <sys/inotify.h>
452 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
453 # ifndef IN_DONT_FOLLOW
454 # undef EV_USE_INOTIFY
455 # define EV_USE_INOTIFY 0
456 # endif
457 #endif
458
459 #if EV_USE_EVENTFD
460 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
461 # include <stdint.h>
462 # ifndef EFD_NONBLOCK
463 # define EFD_NONBLOCK O_NONBLOCK
464 # endif
465 # ifndef EFD_CLOEXEC
466 # ifdef O_CLOEXEC
467 # define EFD_CLOEXEC O_CLOEXEC
468 # else
469 # define EFD_CLOEXEC 02000000
470 # endif
471 # endif
472 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
473 #endif
474
475 #if EV_USE_SIGNALFD
476 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
477 # include <stdint.h>
478 # ifndef SFD_NONBLOCK
479 # define SFD_NONBLOCK O_NONBLOCK
480 # endif
481 # ifndef SFD_CLOEXEC
482 # ifdef O_CLOEXEC
483 # define SFD_CLOEXEC O_CLOEXEC
484 # else
485 # define SFD_CLOEXEC 02000000
486 # endif
487 # endif
488 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
489
490 struct signalfd_siginfo
491 {
492 uint32_t ssi_signo;
493 char pad[128 - sizeof (uint32_t)];
494 };
495 #endif
496
497 /**/
498
499 #if EV_VERIFY >= 3
500 # define EV_FREQUENT_CHECK ev_verify (EV_A)
501 #else
502 # define EV_FREQUENT_CHECK do { } while (0)
503 #endif
504
505 /*
506 * This is used to work around floating point rounding problems.
507 * This value is good at least till the year 4000.
508 */
509 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
510 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
511
512 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
513 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
514
515 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
516 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
517
518 /* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
519 /* ECB.H BEGIN */
520 /*
521 * libecb - http://software.schmorp.de/pkg/libecb
522 *
523 * Copyright (©) 2009-2015 Marc Alexander Lehmann <libecb@schmorp.de>
524 * Copyright (©) 2011 Emanuele Giaquinta
525 * All rights reserved.
526 *
527 * Redistribution and use in source and binary forms, with or without modifica-
528 * tion, are permitted provided that the following conditions are met:
529 *
530 * 1. Redistributions of source code must retain the above copyright notice,
531 * this list of conditions and the following disclaimer.
532 *
533 * 2. Redistributions in binary form must reproduce the above copyright
534 * notice, this list of conditions and the following disclaimer in the
535 * documentation and/or other materials provided with the distribution.
536 *
537 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
538 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
539 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
540 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
541 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
542 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
543 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
544 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
545 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
546 * OF THE POSSIBILITY OF SUCH DAMAGE.
547 *
548 * Alternatively, the contents of this file may be used under the terms of
549 * the GNU General Public License ("GPL") version 2 or any later version,
550 * in which case the provisions of the GPL are applicable instead of
551 * the above. If you wish to allow the use of your version of this file
552 * only under the terms of the GPL and not to allow others to use your
553 * version of this file under the BSD license, indicate your decision
554 * by deleting the provisions above and replace them with the notice
555 * and other provisions required by the GPL. If you do not delete the
556 * provisions above, a recipient may use your version of this file under
557 * either the BSD or the GPL.
558 */
559
560 #ifndef ECB_H
561 #define ECB_H
562
563 /* 16 bits major, 16 bits minor */
564 #define ECB_VERSION 0x00010005
565
566 #ifdef _WIN32
567 typedef signed char int8_t;
568 typedef unsigned char uint8_t;
569 typedef signed short int16_t;
570 typedef unsigned short uint16_t;
571 typedef signed int int32_t;
572 typedef unsigned int uint32_t;
573 #if __GNUC__
574 typedef signed long long int64_t;
575 typedef unsigned long long uint64_t;
576 #else /* _MSC_VER || __BORLANDC__ */
577 typedef signed __int64 int64_t;
578 typedef unsigned __int64 uint64_t;
579 #endif
580 #ifdef _WIN64
581 #define ECB_PTRSIZE 8
582 typedef uint64_t uintptr_t;
583 typedef int64_t intptr_t;
584 #else
585 #define ECB_PTRSIZE 4
586 typedef uint32_t uintptr_t;
587 typedef int32_t intptr_t;
588 #endif
589 #else
590 #include <inttypes.h>
591 #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
592 #define ECB_PTRSIZE 8
593 #else
594 #define ECB_PTRSIZE 4
595 #endif
596 #endif
597
598 #define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
599 #define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
600
601 /* work around x32 idiocy by defining proper macros */
602 #if ECB_GCC_AMD64 || ECB_MSVC_AMD64
603 #if _ILP32
604 #define ECB_AMD64_X32 1
605 #else
606 #define ECB_AMD64 1
607 #endif
608 #endif
609
610 /* many compilers define _GNUC_ to some versions but then only implement
611 * what their idiot authors think are the "more important" extensions,
612 * causing enormous grief in return for some better fake benchmark numbers.
613 * or so.
614 * we try to detect these and simply assume they are not gcc - if they have
615 * an issue with that they should have done it right in the first place.
616 */
617 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
618 #define ECB_GCC_VERSION(major,minor) 0
619 #else
620 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
621 #endif
622
623 #define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
624
625 #if __clang__ && defined __has_builtin
626 #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
627 #else
628 #define ECB_CLANG_BUILTIN(x) 0
629 #endif
630
631 #if __clang__ && defined __has_extension
632 #define ECB_CLANG_EXTENSION(x) __has_extension (x)
633 #else
634 #define ECB_CLANG_EXTENSION(x) 0
635 #endif
636
637 #define ECB_CPP (__cplusplus+0)
638 #define ECB_CPP11 (__cplusplus >= 201103L)
639 #define ECB_CPP14 (__cplusplus >= 201402L)
640 #define ECB_CPP17 (__cplusplus >= 201703L)
641
642 #if ECB_CPP
643 #define ECB_C 0
644 #define ECB_STDC_VERSION 0
645 #else
646 #define ECB_C 1
647 #define ECB_STDC_VERSION __STDC_VERSION__
648 #endif
649
650 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
651 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
652 #define ECB_C17 (ECB_STDC_VERSION >= 201710L)
653
654 #if ECB_CPP
655 #define ECB_EXTERN_C extern "C"
656 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
657 #define ECB_EXTERN_C_END }
658 #else
659 #define ECB_EXTERN_C extern
660 #define ECB_EXTERN_C_BEG
661 #define ECB_EXTERN_C_END
662 #endif
663
664 /*****************************************************************************/
665
666 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
667 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
668
669 #if ECB_NO_THREADS
670 #define ECB_NO_SMP 1
671 #endif
672
673 #if ECB_NO_SMP
674 #define ECB_MEMORY_FENCE do { } while (0)
675 #endif
676
677 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
678 #if __xlC__ && ECB_CPP
679 #include <builtins.h>
680 #endif
681
682 #if 1400 <= _MSC_VER
683 #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
684 #endif
685
686 #ifndef ECB_MEMORY_FENCE
687 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
688 #if __i386 || __i386__
689 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
690 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
691 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
692 #elif ECB_GCC_AMD64
693 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
694 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
695 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
696 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
697 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
698 #elif defined __ARM_ARCH_2__ \
699 || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
700 || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
701 || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
702 || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
703 || defined __ARM_ARCH_5TEJ__
704 /* should not need any, unless running old code on newer cpu - arm doesn't support that */
705 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
706 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
707 || defined __ARM_ARCH_6T2__
708 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
709 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
710 || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
711 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
712 #elif __aarch64__
713 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
714 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
715 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
716 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
717 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
718 #elif defined __s390__ || defined __s390x__
719 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
720 #elif defined __mips__
721 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
722 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
723 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
724 #elif defined __alpha__
725 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
726 #elif defined __hppa__
727 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
728 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
729 #elif defined __ia64__
730 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
731 #elif defined __m68k__
732 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
733 #elif defined __m88k__
734 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
735 #elif defined __sh__
736 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
737 #endif
738 #endif
739 #endif
740
741 #ifndef ECB_MEMORY_FENCE
742 #if ECB_GCC_VERSION(4,7)
743 /* see comment below (stdatomic.h) about the C11 memory model. */
744 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
745 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
746 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
747
748 #elif ECB_CLANG_EXTENSION(c_atomic)
749 /* see comment below (stdatomic.h) about the C11 memory model. */
750 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
751 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
752 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
753
754 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
755 #define ECB_MEMORY_FENCE __sync_synchronize ()
756 #elif _MSC_VER >= 1500 /* VC++ 2008 */
757 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
758 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
759 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
760 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
761 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
762 #elif _MSC_VER >= 1400 /* VC++ 2005 */
763 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
764 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
765 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
766 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
767 #elif defined _WIN32
768 #include <WinNT.h>
769 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
770 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
771 #include <mbarrier.h>
772 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
773 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
774 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
775 #elif __xlC__
776 #define ECB_MEMORY_FENCE __sync ()
777 #endif
778 #endif
779
780 #ifndef ECB_MEMORY_FENCE
781 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
782 /* we assume that these memory fences work on all variables/all memory accesses, */
783 /* not just C11 atomics and atomic accesses */
784 #include <stdatomic.h>
785 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
786 /* any fence other than seq_cst, which isn't very efficient for us. */
787 /* Why that is, we don't know - either the C11 memory model is quite useless */
788 /* for most usages, or gcc and clang have a bug */
789 /* I *currently* lean towards the latter, and inefficiently implement */
790 /* all three of ecb's fences as a seq_cst fence */
791 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
792 /* for all __atomic_thread_fence's except seq_cst */
793 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
794 #endif
795 #endif
796
797 #ifndef ECB_MEMORY_FENCE
798 #if !ECB_AVOID_PTHREADS
799 /*
800 * if you get undefined symbol references to pthread_mutex_lock,
801 * or failure to find pthread.h, then you should implement
802 * the ECB_MEMORY_FENCE operations for your cpu/compiler
803 * OR provide pthread.h and link against the posix thread library
804 * of your system.
805 */
806 #include <pthread.h>
807 #define ECB_NEEDS_PTHREADS 1
808 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
809
810 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
811 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
812 #endif
813 #endif
814
815 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
816 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
817 #endif
818
819 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
820 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
821 #endif
822
823 /*****************************************************************************/
824
825 #if ECB_CPP
826 #define ecb_inline static inline
827 #elif ECB_GCC_VERSION(2,5)
828 #define ecb_inline static __inline__
829 #elif ECB_C99
830 #define ecb_inline static inline
831 #else
832 #define ecb_inline static
833 #endif
834
835 #if ECB_GCC_VERSION(3,3)
836 #define ecb_restrict __restrict__
837 #elif ECB_C99
838 #define ecb_restrict restrict
839 #else
840 #define ecb_restrict
841 #endif
842
843 typedef int ecb_bool;
844
845 #define ECB_CONCAT_(a, b) a ## b
846 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
847 #define ECB_STRINGIFY_(a) # a
848 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
849 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
850
851 #define ecb_function_ ecb_inline
852
853 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
854 #define ecb_attribute(attrlist) __attribute__ (attrlist)
855 #else
856 #define ecb_attribute(attrlist)
857 #endif
858
859 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
860 #define ecb_is_constant(expr) __builtin_constant_p (expr)
861 #else
862 /* possible C11 impl for integral types
863 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
864 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
865
866 #define ecb_is_constant(expr) 0
867 #endif
868
869 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
870 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
871 #else
872 #define ecb_expect(expr,value) (expr)
873 #endif
874
875 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
876 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
877 #else
878 #define ecb_prefetch(addr,rw,locality)
879 #endif
880
881 /* no emulation for ecb_decltype */
882 #if ECB_CPP11
883 // older implementations might have problems with decltype(x)::type, work around it
884 template<class T> struct ecb_decltype_t { typedef T type; };
885 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
886 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
887 #define ecb_decltype(x) __typeof__ (x)
888 #endif
889
890 #if _MSC_VER >= 1300
891 #define ecb_deprecated __declspec (deprecated)
892 #else
893 #define ecb_deprecated ecb_attribute ((__deprecated__))
894 #endif
895
896 #if _MSC_VER >= 1500
897 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
898 #elif ECB_GCC_VERSION(4,5)
899 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
900 #else
901 #define ecb_deprecated_message(msg) ecb_deprecated
902 #endif
903
904 #if _MSC_VER >= 1400
905 #define ecb_noinline __declspec (noinline)
906 #else
907 #define ecb_noinline ecb_attribute ((__noinline__))
908 #endif
909
910 #define ecb_unused ecb_attribute ((__unused__))
911 #define ecb_const ecb_attribute ((__const__))
912 #define ecb_pure ecb_attribute ((__pure__))
913
914 #if ECB_C11 || __IBMC_NORETURN
915 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
916 #define ecb_noreturn _Noreturn
917 #elif ECB_CPP11
918 #define ecb_noreturn [[noreturn]]
919 #elif _MSC_VER >= 1200
920 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
921 #define ecb_noreturn __declspec (noreturn)
922 #else
923 #define ecb_noreturn ecb_attribute ((__noreturn__))
924 #endif
925
926 #if ECB_GCC_VERSION(4,3)
927 #define ecb_artificial ecb_attribute ((__artificial__))
928 #define ecb_hot ecb_attribute ((__hot__))
929 #define ecb_cold ecb_attribute ((__cold__))
930 #else
931 #define ecb_artificial
932 #define ecb_hot
933 #define ecb_cold
934 #endif
935
936 /* put around conditional expressions if you are very sure that the */
937 /* expression is mostly true or mostly false. note that these return */
938 /* booleans, not the expression. */
939 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
940 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
941 /* for compatibility to the rest of the world */
942 #define ecb_likely(expr) ecb_expect_true (expr)
943 #define ecb_unlikely(expr) ecb_expect_false (expr)
944
945 /* count trailing zero bits and count # of one bits */
946 #if ECB_GCC_VERSION(3,4) \
947 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
948 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
949 && ECB_CLANG_BUILTIN(__builtin_popcount))
950 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
951 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
952 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
953 #define ecb_ctz32(x) __builtin_ctz (x)
954 #define ecb_ctz64(x) __builtin_ctzll (x)
955 #define ecb_popcount32(x) __builtin_popcount (x)
956 /* no popcountll */
957 #else
958 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
959 ecb_function_ ecb_const int
960 ecb_ctz32 (uint32_t x)
961 {
962 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
963 unsigned long r;
964 _BitScanForward (&r, x);
965 return (int)r;
966 #else
967 int r = 0;
968
969 x &= ~x + 1; /* this isolates the lowest bit */
970
971 #if ECB_branchless_on_i386
972 r += !!(x & 0xaaaaaaaa) << 0;
973 r += !!(x & 0xcccccccc) << 1;
974 r += !!(x & 0xf0f0f0f0) << 2;
975 r += !!(x & 0xff00ff00) << 3;
976 r += !!(x & 0xffff0000) << 4;
977 #else
978 if (x & 0xaaaaaaaa) r += 1;
979 if (x & 0xcccccccc) r += 2;
980 if (x & 0xf0f0f0f0) r += 4;
981 if (x & 0xff00ff00) r += 8;
982 if (x & 0xffff0000) r += 16;
983 #endif
984
985 return r;
986 #endif
987 }
988
989 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
990 ecb_function_ ecb_const int
991 ecb_ctz64 (uint64_t x)
992 {
993 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
994 unsigned long r;
995 _BitScanForward64 (&r, x);
996 return (int)r;
997 #else
998 int shift = x & 0xffffffff ? 0 : 32;
999 return ecb_ctz32 (x >> shift) + shift;
1000 #endif
1001 }
1002
1003 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
1004 ecb_function_ ecb_const int
1005 ecb_popcount32 (uint32_t x)
1006 {
1007 x -= (x >> 1) & 0x55555555;
1008 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
1009 x = ((x >> 4) + x) & 0x0f0f0f0f;
1010 x *= 0x01010101;
1011
1012 return x >> 24;
1013 }
1014
1015 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
1016 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
1017 {
1018 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
1019 unsigned long r;
1020 _BitScanReverse (&r, x);
1021 return (int)r;
1022 #else
1023 int r = 0;
1024
1025 if (x >> 16) { x >>= 16; r += 16; }
1026 if (x >> 8) { x >>= 8; r += 8; }
1027 if (x >> 4) { x >>= 4; r += 4; }
1028 if (x >> 2) { x >>= 2; r += 2; }
1029 if (x >> 1) { r += 1; }
1030
1031 return r;
1032 #endif
1033 }
1034
1035 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
1036 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
1037 {
1038 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
1039 unsigned long r;
1040 _BitScanReverse64 (&r, x);
1041 return (int)r;
1042 #else
1043 int r = 0;
1044
1045 if (x >> 32) { x >>= 32; r += 32; }
1046
1047 return r + ecb_ld32 (x);
1048 #endif
1049 }
1050 #endif
1051
1052 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
1053 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
1054 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
1055 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
1056
1057 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
1058 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
1059 {
1060 return ( (x * 0x0802U & 0x22110U)
1061 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
1062 }
1063
1064 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
1065 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
1066 {
1067 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
1068 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
1069 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
1070 x = ( x >> 8 ) | ( x << 8);
1071
1072 return x;
1073 }
1074
1075 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
1076 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
1077 {
1078 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
1079 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
1080 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
1081 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
1082 x = ( x >> 16 ) | ( x << 16);
1083
1084 return x;
1085 }
1086
1087 /* popcount64 is only available on 64 bit cpus as gcc builtin */
1088 /* so for this version we are lazy */
1089 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
1090 ecb_function_ ecb_const int
1091 ecb_popcount64 (uint64_t x)
1092 {
1093 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
1094 }
1095
1096 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
1097 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
1098 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
1099 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
1100 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
1101 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
1102 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
1103 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
1104
1105 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
1106 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
1107 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
1108 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
1109 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
1110 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
1111 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
1112 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
1113
1114 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
1115 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
1116 #define ecb_bswap16(x) __builtin_bswap16 (x)
1117 #else
1118 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
1119 #endif
1120 #define ecb_bswap32(x) __builtin_bswap32 (x)
1121 #define ecb_bswap64(x) __builtin_bswap64 (x)
1122 #elif _MSC_VER
1123 #include <stdlib.h>
1124 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
1125 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
1126 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
1127 #else
1128 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
1129 ecb_function_ ecb_const uint16_t
1130 ecb_bswap16 (uint16_t x)
1131 {
1132 return ecb_rotl16 (x, 8);
1133 }
1134
1135 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
1136 ecb_function_ ecb_const uint32_t
1137 ecb_bswap32 (uint32_t x)
1138 {
1139 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
1140 }
1141
1142 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
1143 ecb_function_ ecb_const uint64_t
1144 ecb_bswap64 (uint64_t x)
1145 {
1146 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
1147 }
1148 #endif
1149
1150 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
1151 #define ecb_unreachable() __builtin_unreachable ()
1152 #else
1153 /* this seems to work fine, but gcc always emits a warning for it :/ */
1154 ecb_inline ecb_noreturn void ecb_unreachable (void);
1155 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
1156 #endif
1157
1158 /* try to tell the compiler that some condition is definitely true */
1159 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
1160
1161 ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
1162 ecb_inline ecb_const uint32_t
1163 ecb_byteorder_helper (void)
1164 {
1165 /* the union code still generates code under pressure in gcc, */
1166 /* but less than using pointers, and always seems to */
1167 /* successfully return a constant. */
1168 /* the reason why we have this horrible preprocessor mess */
1169 /* is to avoid it in all cases, at least on common architectures */
1170 /* or when using a recent enough gcc version (>= 4.6) */
1171 #if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
1172 || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
1173 #define ECB_LITTLE_ENDIAN 1
1174 return 0x44332211;
1175 #elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
1176 || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
1177 #define ECB_BIG_ENDIAN 1
1178 return 0x11223344;
1179 #else
1180 union
1181 {
1182 uint8_t c[4];
1183 uint32_t u;
1184 } u = { 0x11, 0x22, 0x33, 0x44 };
1185 return u.u;
1186 #endif
1187 }
1188
1189 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
1190 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
1191 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
1192 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
1193
1194 #if ECB_GCC_VERSION(3,0) || ECB_C99
1195 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
1196 #else
1197 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
1198 #endif
1199
1200 #if ECB_CPP
1201 template<typename T>
1202 static inline T ecb_div_rd (T val, T div)
1203 {
1204 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
1205 }
1206 template<typename T>
1207 static inline T ecb_div_ru (T val, T div)
1208 {
1209 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
1210 }
1211 #else
1212 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
1213 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
1214 #endif
1215
1216 #if ecb_cplusplus_does_not_suck
1217 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
1218 template<typename T, int N>
1219 static inline int ecb_array_length (const T (&arr)[N])
1220 {
1221 return N;
1222 }
1223 #else
1224 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
1225 #endif
1226
1227 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
1228 ecb_function_ ecb_const uint32_t
1229 ecb_binary16_to_binary32 (uint32_t x)
1230 {
1231 unsigned int s = (x & 0x8000) << (31 - 15);
1232 int e = (x >> 10) & 0x001f;
1233 unsigned int m = x & 0x03ff;
1234
1235 if (ecb_expect_false (e == 31))
1236 /* infinity or NaN */
1237 e = 255 - (127 - 15);
1238 else if (ecb_expect_false (!e))
1239 {
1240 if (ecb_expect_true (!m))
1241 /* zero, handled by code below by forcing e to 0 */
1242 e = 0 - (127 - 15);
1243 else
1244 {
1245 /* subnormal, renormalise */
1246 unsigned int s = 10 - ecb_ld32 (m);
1247
1248 m = (m << s) & 0x3ff; /* mask implicit bit */
1249 e -= s - 1;
1250 }
1251 }
1252
1253 /* e and m now are normalised, or zero, (or inf or nan) */
1254 e += 127 - 15;
1255
1256 return s | (e << 23) | (m << (23 - 10));
1257 }
1258
1259 ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
1260 ecb_function_ ecb_const uint16_t
1261 ecb_binary32_to_binary16 (uint32_t x)
1262 {
1263 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
1264 unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
1265 unsigned int m = x & 0x007fffff;
1266
1267 x &= 0x7fffffff;
1268
1269 /* if it's within range of binary16 normals, use fast path */
1270 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
1271 {
1272 /* mantissa round-to-even */
1273 m += 0x00000fff + ((m >> (23 - 10)) & 1);
1274
1275 /* handle overflow */
1276 if (ecb_expect_false (m >= 0x00800000))
1277 {
1278 m >>= 1;
1279 e += 1;
1280 }
1281
1282 return s | (e << 10) | (m >> (23 - 10));
1283 }
1284
1285 /* handle large numbers and infinity */
1286 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
1287 return s | 0x7c00;
1288
1289 /* handle zero, subnormals and small numbers */
1290 if (ecb_expect_true (x < 0x38800000))
1291 {
1292 /* zero */
1293 if (ecb_expect_true (!x))
1294 return s;
1295
1296 /* handle subnormals */
1297
1298 /* too small, will be zero */
1299 if (e < (14 - 24)) /* might not be sharp, but is good enough */
1300 return s;
1301
1302 m |= 0x00800000; /* make implicit bit explicit */
1303
1304 /* very tricky - we need to round to the nearest e (+10) bit value */
1305 {
1306 unsigned int bits = 14 - e;
1307 unsigned int half = (1 << (bits - 1)) - 1;
1308 unsigned int even = (m >> bits) & 1;
1309
1310 /* if this overflows, we will end up with a normalised number */
1311 m = (m + half + even) >> bits;
1312 }
1313
1314 return s | m;
1315 }
1316
1317 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
1318 m >>= 13;
1319
1320 return s | 0x7c00 | m | !m;
1321 }
1322
1323 /*******************************************************************************/
1324 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
1325
1326 /* basically, everything uses "ieee pure-endian" floating point numbers */
1327 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
1328 #if 0 \
1329 || __i386 || __i386__ \
1330 || ECB_GCC_AMD64 \
1331 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
1332 || defined __s390__ || defined __s390x__ \
1333 || defined __mips__ \
1334 || defined __alpha__ \
1335 || defined __hppa__ \
1336 || defined __ia64__ \
1337 || defined __m68k__ \
1338 || defined __m88k__ \
1339 || defined __sh__ \
1340 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
1341 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
1342 || defined __aarch64__
1343 #define ECB_STDFP 1
1344 #include <string.h> /* for memcpy */
1345 #else
1346 #define ECB_STDFP 0
1347 #endif
1348
1349 #ifndef ECB_NO_LIBM
1350
1351 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
1352
1353 /* only the oldest of old doesn't have this one. solaris. */
1354 #ifdef INFINITY
1355 #define ECB_INFINITY INFINITY
1356 #else
1357 #define ECB_INFINITY HUGE_VAL
1358 #endif
1359
1360 #ifdef NAN
1361 #define ECB_NAN NAN
1362 #else
1363 #define ECB_NAN ECB_INFINITY
1364 #endif
1365
1366 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
1367 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
1368 #define ecb_frexpf(x,e) frexpf ((x), (e))
1369 #else
1370 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
1371 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
1372 #endif
1373
1374 /* convert a float to ieee single/binary32 */
1375 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
1376 ecb_function_ ecb_const uint32_t
1377 ecb_float_to_binary32 (float x)
1378 {
1379 uint32_t r;
1380
1381 #if ECB_STDFP
1382 memcpy (&r, &x, 4);
1383 #else
1384 /* slow emulation, works for anything but -0 */
1385 uint32_t m;
1386 int e;
1387
1388 if (x == 0e0f ) return 0x00000000U;
1389 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
1390 if (x < -3.40282346638528860e+38f) return 0xff800000U;
1391 if (x != x ) return 0x7fbfffffU;
1392
1393 m = ecb_frexpf (x, &e) * 0x1000000U;
1394
1395 r = m & 0x80000000U;
1396
1397 if (r)
1398 m = -m;
1399
1400 if (e <= -126)
1401 {
1402 m &= 0xffffffU;
1403 m >>= (-125 - e);
1404 e = -126;
1405 }
1406
1407 r |= (e + 126) << 23;
1408 r |= m & 0x7fffffU;
1409 #endif
1410
1411 return r;
1412 }
1413
1414 /* converts an ieee single/binary32 to a float */
1415 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
1416 ecb_function_ ecb_const float
1417 ecb_binary32_to_float (uint32_t x)
1418 {
1419 float r;
1420
1421 #if ECB_STDFP
1422 memcpy (&r, &x, 4);
1423 #else
1424 /* emulation, only works for normals and subnormals and +0 */
1425 int neg = x >> 31;
1426 int e = (x >> 23) & 0xffU;
1427
1428 x &= 0x7fffffU;
1429
1430 if (e)
1431 x |= 0x800000U;
1432 else
1433 e = 1;
1434
1435 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
1436 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
1437
1438 r = neg ? -r : r;
1439 #endif
1440
1441 return r;
1442 }
1443
1444 /* convert a double to ieee double/binary64 */
1445 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
1446 ecb_function_ ecb_const uint64_t
1447 ecb_double_to_binary64 (double x)
1448 {
1449 uint64_t r;
1450
1451 #if ECB_STDFP
1452 memcpy (&r, &x, 8);
1453 #else
1454 /* slow emulation, works for anything but -0 */
1455 uint64_t m;
1456 int e;
1457
1458 if (x == 0e0 ) return 0x0000000000000000U;
1459 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
1460 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
1461 if (x != x ) return 0X7ff7ffffffffffffU;
1462
1463 m = frexp (x, &e) * 0x20000000000000U;
1464
1465 r = m & 0x8000000000000000;;
1466
1467 if (r)
1468 m = -m;
1469
1470 if (e <= -1022)
1471 {
1472 m &= 0x1fffffffffffffU;
1473 m >>= (-1021 - e);
1474 e = -1022;
1475 }
1476
1477 r |= ((uint64_t)(e + 1022)) << 52;
1478 r |= m & 0xfffffffffffffU;
1479 #endif
1480
1481 return r;
1482 }
1483
1484 /* converts an ieee double/binary64 to a double */
1485 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
1486 ecb_function_ ecb_const double
1487 ecb_binary64_to_double (uint64_t x)
1488 {
1489 double r;
1490
1491 #if ECB_STDFP
1492 memcpy (&r, &x, 8);
1493 #else
1494 /* emulation, only works for normals and subnormals and +0 */
1495 int neg = x >> 63;
1496 int e = (x >> 52) & 0x7ffU;
1497
1498 x &= 0xfffffffffffffU;
1499
1500 if (e)
1501 x |= 0x10000000000000U;
1502 else
1503 e = 1;
1504
1505 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
1506 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
1507
1508 r = neg ? -r : r;
1509 #endif
1510
1511 return r;
1512 }
1513
1514 /* convert a float to ieee half/binary16 */
1515 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
1516 ecb_function_ ecb_const uint16_t
1517 ecb_float_to_binary16 (float x)
1518 {
1519 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
1520 }
1521
1522 /* convert an ieee half/binary16 to float */
1523 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1524 ecb_function_ ecb_const float
1525 ecb_binary16_to_float (uint16_t x)
1526 {
1527 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1528 }
1529
1530 #endif
1531
1532 #endif
1533
1534 /* ECB.H END */
1535
1536 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
1537 /* if your architecture doesn't need memory fences, e.g. because it is
1538 * single-cpu/core, or if you use libev in a project that doesn't use libev
1539 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
1540 * libev, in which cases the memory fences become nops.
1541 * alternatively, you can remove this #error and link against libpthread,
1542 * which will then provide the memory fences.
1543 */
1544 # error "memory fences not defined for your architecture, please report"
1545 #endif
1546
1547 #ifndef ECB_MEMORY_FENCE
1548 # define ECB_MEMORY_FENCE do { } while (0)
1549 # define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
1550 # define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
1551 #endif
1552
1553 #define expect_false(cond) ecb_expect_false (cond)
1554 #define expect_true(cond) ecb_expect_true (cond)
1555 #define noinline ecb_noinline
1556
1557 #define inline_size ecb_inline
1558
1559 #if EV_FEATURE_CODE
1560 # define inline_speed ecb_inline
1561 #else
1562 # define inline_speed noinline static
1563 #endif
1564
1565 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
1566
1567 #if EV_MINPRI == EV_MAXPRI
1568 # define ABSPRI(w) (((W)w), 0)
1569 #else
1570 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
1571 #endif
1572
1573 #define EMPTY /* required for microsofts broken pseudo-c compiler */
1574
1575 typedef ev_watcher *W;
1576 typedef ev_watcher_list *WL;
1577 typedef ev_watcher_time *WT;
1578
1579 #define ev_active(w) ((W)(w))->active
1580 #define ev_at(w) ((WT)(w))->at
1581
1582 #if EV_USE_REALTIME
1583 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
1584 /* giving it a reasonably high chance of working on typical architectures */
1585 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
1586 #endif
1587
1588 #if EV_USE_MONOTONIC
1589 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
1590 #endif
1591
1592 #ifndef EV_FD_TO_WIN32_HANDLE
1593 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
1594 #endif
1595 #ifndef EV_WIN32_HANDLE_TO_FD
1596 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
1597 #endif
1598 #ifndef EV_WIN32_CLOSE_FD
1599 # define EV_WIN32_CLOSE_FD(fd) close (fd)
1600 #endif
1601
1602 #ifdef _WIN32
1603 # include "ev_win32.c"
1604 #endif
1605
1606 /*****************************************************************************/
1607
1608 /* define a suitable floor function (only used by periodics atm) */
1609
1610 #if EV_USE_FLOOR
1611 # include <math.h>
1612 # define ev_floor(v) floor (v)
1613 #else
1614
1615 #include <float.h>
1616
1617 /* a floor() replacement function, should be independent of ev_tstamp type */
1618 noinline
1619 static ev_tstamp
1620 ev_floor (ev_tstamp v)
1621 {
1622 /* the choice of shift factor is not terribly important */
1623 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1624 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1625 #else
1626 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1627 #endif
1628
1629 /* argument too large for an unsigned long? */
1630 if (expect_false (v >= shift))
1631 {
1632 ev_tstamp f;
1633
1634 if (v == v - 1.)
1635 return v; /* very large number */
1636
1637 f = shift * ev_floor (v * (1. / shift));
1638 return f + ev_floor (v - f);
1639 }
1640
1641 /* special treatment for negative args? */
1642 if (expect_false (v < 0.))
1643 {
1644 ev_tstamp f = -ev_floor (-v);
1645
1646 return f - (f == v ? 0 : 1);
1647 }
1648
1649 /* fits into an unsigned long */
1650 return (unsigned long)v;
1651 }
1652
1653 #endif
1654
1655 /*****************************************************************************/
1656
1657 #ifdef __linux
1658 # include <sys/utsname.h>
1659 #endif
1660
1661 noinline ecb_cold
1662 static unsigned int
1663 ev_linux_version (void)
1664 {
1665 #ifdef __linux
1666 unsigned int v = 0;
1667 struct utsname buf;
1668 int i;
1669 char *p = buf.release;
1670
1671 if (uname (&buf))
1672 return 0;
1673
1674 for (i = 3+1; --i; )
1675 {
1676 unsigned int c = 0;
1677
1678 for (;;)
1679 {
1680 if (*p >= '0' && *p <= '9')
1681 c = c * 10 + *p++ - '0';
1682 else
1683 {
1684 p += *p == '.';
1685 break;
1686 }
1687 }
1688
1689 v = (v << 8) | c;
1690 }
1691
1692 return v;
1693 #else
1694 return 0;
1695 #endif
1696 }
1697
1698 /*****************************************************************************/
1699
1700 #if EV_AVOID_STDIO
1701 noinline ecb_cold
1702 static void
1703 ev_printerr (const char *msg)
1704 {
1705 write (STDERR_FILENO, msg, strlen (msg));
1706 }
1707 #endif
1708
1709 static void (*syserr_cb)(const char *msg) EV_NOEXCEPT;
1710
1711 ecb_cold
1712 void
1713 ev_set_syserr_cb (void (*cb)(const char *msg) EV_NOEXCEPT) EV_NOEXCEPT
1714 {
1715 syserr_cb = cb;
1716 }
1717
1718 noinline ecb_cold
1719 static void
1720 ev_syserr (const char *msg)
1721 {
1722 if (!msg)
1723 msg = "(libev) system error";
1724
1725 if (syserr_cb)
1726 syserr_cb (msg);
1727 else
1728 {
1729 #if EV_AVOID_STDIO
1730 ev_printerr (msg);
1731 ev_printerr (": ");
1732 ev_printerr (strerror (errno));
1733 ev_printerr ("\n");
1734 #else
1735 perror (msg);
1736 #endif
1737 abort ();
1738 }
1739 }
1740
1741 static void *
1742 ev_realloc_emul (void *ptr, long size) EV_NOEXCEPT
1743 {
1744 /* some systems, notably openbsd and darwin, fail to properly
1745 * implement realloc (x, 0) (as required by both ansi c-89 and
1746 * the single unix specification, so work around them here.
1747 * recently, also (at least) fedora and debian started breaking it,
1748 * despite documenting it otherwise.
1749 */
1750
1751 if (size)
1752 return realloc (ptr, size);
1753
1754 free (ptr);
1755 return 0;
1756 }
1757
1758 static void *(*alloc)(void *ptr, long size) EV_NOEXCEPT = ev_realloc_emul;
1759
1760 ecb_cold
1761 void
1762 ev_set_allocator (void *(*cb)(void *ptr, long size) EV_NOEXCEPT) EV_NOEXCEPT
1763 {
1764 alloc = cb;
1765 }
1766
1767 inline_speed void *
1768 ev_realloc (void *ptr, long size)
1769 {
1770 ptr = alloc (ptr, size);
1771
1772 if (!ptr && size)
1773 {
1774 #if EV_AVOID_STDIO
1775 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1776 #else
1777 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1778 #endif
1779 abort ();
1780 }
1781
1782 return ptr;
1783 }
1784
1785 #define ev_malloc(size) ev_realloc (0, (size))
1786 #define ev_free(ptr) ev_realloc ((ptr), 0)
1787
1788 /*****************************************************************************/
1789
1790 /* set in reify when reification needed */
1791 #define EV_ANFD_REIFY 1
1792
1793 /* file descriptor info structure */
1794 typedef struct
1795 {
1796 WL head;
1797 unsigned char events; /* the events watched for */
1798 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1799 unsigned char emask; /* some backends store the actual kernel mask in here */
1800 unsigned char unused;
1801 #if EV_USE_EPOLL
1802 unsigned int egen; /* generation counter to counter epoll bugs */
1803 #endif
1804 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1805 SOCKET handle;
1806 #endif
1807 #if EV_USE_IOCP
1808 OVERLAPPED or, ow;
1809 #endif
1810 } ANFD;
1811
1812 /* stores the pending event set for a given watcher */
1813 typedef struct
1814 {
1815 W w;
1816 int events; /* the pending event set for the given watcher */
1817 } ANPENDING;
1818
1819 #if EV_USE_INOTIFY
1820 /* hash table entry per inotify-id */
1821 typedef struct
1822 {
1823 WL head;
1824 } ANFS;
1825 #endif
1826
1827 /* Heap Entry */
1828 #if EV_HEAP_CACHE_AT
1829 /* a heap element */
1830 typedef struct {
1831 ev_tstamp at;
1832 WT w;
1833 } ANHE;
1834
1835 #define ANHE_w(he) (he).w /* access watcher, read-write */
1836 #define ANHE_at(he) (he).at /* access cached at, read-only */
1837 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1838 #else
1839 /* a heap element */
1840 typedef WT ANHE;
1841
1842 #define ANHE_w(he) (he)
1843 #define ANHE_at(he) (he)->at
1844 #define ANHE_at_cache(he)
1845 #endif
1846
1847 #if EV_MULTIPLICITY
1848
1849 struct ev_loop
1850 {
1851 ev_tstamp ev_rt_now;
1852 #define ev_rt_now ((loop)->ev_rt_now)
1853 #define VAR(name,decl) decl;
1854 #include "ev_vars.h"
1855 #undef VAR
1856 };
1857 #include "ev_wrap.h"
1858
1859 static struct ev_loop default_loop_struct;
1860 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1861
1862 #else
1863
1864 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1865 #define VAR(name,decl) static decl;
1866 #include "ev_vars.h"
1867 #undef VAR
1868
1869 static int ev_default_loop_ptr;
1870
1871 #endif
1872
1873 #if EV_FEATURE_API
1874 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1875 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1876 # define EV_INVOKE_PENDING invoke_cb (EV_A)
1877 #else
1878 # define EV_RELEASE_CB (void)0
1879 # define EV_ACQUIRE_CB (void)0
1880 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1881 #endif
1882
1883 #define EVBREAK_RECURSE 0x80
1884
1885 /*****************************************************************************/
1886
1887 #ifndef EV_HAVE_EV_TIME
1888 ev_tstamp
1889 ev_time (void) EV_NOEXCEPT
1890 {
1891 #if EV_USE_REALTIME
1892 if (expect_true (have_realtime))
1893 {
1894 struct timespec ts;
1895 clock_gettime (CLOCK_REALTIME, &ts);
1896 return ts.tv_sec + ts.tv_nsec * 1e-9;
1897 }
1898 #endif
1899
1900 struct timeval tv;
1901 gettimeofday (&tv, 0);
1902 return tv.tv_sec + tv.tv_usec * 1e-6;
1903 }
1904 #endif
1905
1906 inline_size ev_tstamp
1907 get_clock (void)
1908 {
1909 #if EV_USE_MONOTONIC
1910 if (expect_true (have_monotonic))
1911 {
1912 struct timespec ts;
1913 clock_gettime (CLOCK_MONOTONIC, &ts);
1914 return ts.tv_sec + ts.tv_nsec * 1e-9;
1915 }
1916 #endif
1917
1918 return ev_time ();
1919 }
1920
1921 #if EV_MULTIPLICITY
1922 ev_tstamp
1923 ev_now (EV_P) EV_NOEXCEPT
1924 {
1925 return ev_rt_now;
1926 }
1927 #endif
1928
1929 void
1930 ev_sleep (ev_tstamp delay) EV_NOEXCEPT
1931 {
1932 if (delay > 0.)
1933 {
1934 #if EV_USE_NANOSLEEP
1935 struct timespec ts;
1936
1937 EV_TS_SET (ts, delay);
1938 nanosleep (&ts, 0);
1939 #elif defined _WIN32
1940 /* maybe this should round up, as ms is very low resolution */
1941 /* compared to select (µs) or nanosleep (ns) */
1942 Sleep ((unsigned long)(delay * 1e3));
1943 #else
1944 struct timeval tv;
1945
1946 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1947 /* something not guaranteed by newer posix versions, but guaranteed */
1948 /* by older ones */
1949 EV_TV_SET (tv, delay);
1950 select (0, 0, 0, 0, &tv);
1951 #endif
1952 }
1953 }
1954
1955 /*****************************************************************************/
1956
1957 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1958
1959 /* find a suitable new size for the given array, */
1960 /* hopefully by rounding to a nice-to-malloc size */
1961 inline_size int
1962 array_nextsize (int elem, int cur, int cnt)
1963 {
1964 int ncur = cur + 1;
1965
1966 do
1967 ncur <<= 1;
1968 while (cnt > ncur);
1969
1970 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1971 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1972 {
1973 ncur *= elem;
1974 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1975 ncur = ncur - sizeof (void *) * 4;
1976 ncur /= elem;
1977 }
1978
1979 return ncur;
1980 }
1981
1982 noinline ecb_cold
1983 static void *
1984 array_realloc (int elem, void *base, int *cur, int cnt)
1985 {
1986 *cur = array_nextsize (elem, *cur, cnt);
1987 return ev_realloc (base, elem * *cur);
1988 }
1989
1990 #define array_needsize_noinit(base,count)
1991
1992 #define array_needsize_zerofill(base,count) \
1993 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1994
1995 #define array_needsize(type,base,cur,cnt,init) \
1996 if (expect_false ((cnt) > (cur))) \
1997 { \
1998 ecb_unused int ocur_ = (cur); \
1999 (base) = (type *)array_realloc \
2000 (sizeof (type), (base), &(cur), (cnt)); \
2001 init ((base) + (ocur_), (cur) - ocur_); \
2002 }
2003
2004 #if 0
2005 #define array_slim(type,stem) \
2006 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
2007 { \
2008 stem ## max = array_roundsize (stem ## cnt >> 1); \
2009 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
2010 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
2011 }
2012 #endif
2013
2014 #define array_free(stem, idx) \
2015 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
2016
2017 /*****************************************************************************/
2018
2019 /* dummy callback for pending events */
2020 noinline
2021 static void
2022 pendingcb (EV_P_ ev_prepare *w, int revents)
2023 {
2024 }
2025
2026 noinline
2027 void
2028 ev_feed_event (EV_P_ void *w, int revents) EV_NOEXCEPT
2029 {
2030 W w_ = (W)w;
2031 int pri = ABSPRI (w_);
2032
2033 if (expect_false (w_->pending))
2034 pendings [pri][w_->pending - 1].events |= revents;
2035 else
2036 {
2037 w_->pending = ++pendingcnt [pri];
2038 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, array_needsize_noinit);
2039 pendings [pri][w_->pending - 1].w = w_;
2040 pendings [pri][w_->pending - 1].events = revents;
2041 }
2042
2043 pendingpri = NUMPRI - 1;
2044 }
2045
2046 inline_speed void
2047 feed_reverse (EV_P_ W w)
2048 {
2049 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, array_needsize_noinit);
2050 rfeeds [rfeedcnt++] = w;
2051 }
2052
2053 inline_size void
2054 feed_reverse_done (EV_P_ int revents)
2055 {
2056 do
2057 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
2058 while (rfeedcnt);
2059 }
2060
2061 inline_speed void
2062 queue_events (EV_P_ W *events, int eventcnt, int type)
2063 {
2064 int i;
2065
2066 for (i = 0; i < eventcnt; ++i)
2067 ev_feed_event (EV_A_ events [i], type);
2068 }
2069
2070 /*****************************************************************************/
2071
2072 inline_speed void
2073 fd_event_nocheck (EV_P_ int fd, int revents)
2074 {
2075 ANFD *anfd = anfds + fd;
2076 ev_io *w;
2077
2078 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
2079 {
2080 int ev = w->events & revents;
2081
2082 if (ev)
2083 ev_feed_event (EV_A_ (W)w, ev);
2084 }
2085 }
2086
2087 /* do not submit kernel events for fds that have reify set */
2088 /* because that means they changed while we were polling for new events */
2089 inline_speed void
2090 fd_event (EV_P_ int fd, int revents)
2091 {
2092 ANFD *anfd = anfds + fd;
2093
2094 if (expect_true (!anfd->reify))
2095 fd_event_nocheck (EV_A_ fd, revents);
2096 }
2097
2098 void
2099 ev_feed_fd_event (EV_P_ int fd, int revents) EV_NOEXCEPT
2100 {
2101 if (fd >= 0 && fd < anfdmax)
2102 fd_event_nocheck (EV_A_ fd, revents);
2103 }
2104
2105 /* make sure the external fd watch events are in-sync */
2106 /* with the kernel/libev internal state */
2107 inline_size void
2108 fd_reify (EV_P)
2109 {
2110 int i;
2111
2112 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
2113 for (i = 0; i < fdchangecnt; ++i)
2114 {
2115 int fd = fdchanges [i];
2116 ANFD *anfd = anfds + fd;
2117
2118 if (anfd->reify & EV__IOFDSET && anfd->head)
2119 {
2120 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
2121
2122 if (handle != anfd->handle)
2123 {
2124 unsigned long arg;
2125
2126 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
2127
2128 /* handle changed, but fd didn't - we need to do it in two steps */
2129 backend_modify (EV_A_ fd, anfd->events, 0);
2130 anfd->events = 0;
2131 anfd->handle = handle;
2132 }
2133 }
2134 }
2135 #endif
2136
2137 for (i = 0; i < fdchangecnt; ++i)
2138 {
2139 int fd = fdchanges [i];
2140 ANFD *anfd = anfds + fd;
2141 ev_io *w;
2142
2143 unsigned char o_events = anfd->events;
2144 unsigned char o_reify = anfd->reify;
2145
2146 anfd->reify = 0;
2147
2148 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
2149 {
2150 anfd->events = 0;
2151
2152 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
2153 anfd->events |= (unsigned char)w->events;
2154
2155 if (o_events != anfd->events)
2156 o_reify = EV__IOFDSET; /* actually |= */
2157 }
2158
2159 if (o_reify & EV__IOFDSET)
2160 backend_modify (EV_A_ fd, o_events, anfd->events);
2161 }
2162
2163 fdchangecnt = 0;
2164 }
2165
2166 /* something about the given fd changed */
2167 inline_size
2168 void
2169 fd_change (EV_P_ int fd, int flags)
2170 {
2171 unsigned char reify = anfds [fd].reify;
2172 anfds [fd].reify |= flags;
2173
2174 if (expect_true (!reify))
2175 {
2176 ++fdchangecnt;
2177 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, array_needsize_noinit);
2178 fdchanges [fdchangecnt - 1] = fd;
2179 }
2180 }
2181
2182 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
2183 inline_speed ecb_cold void
2184 fd_kill (EV_P_ int fd)
2185 {
2186 ev_io *w;
2187
2188 while ((w = (ev_io *)anfds [fd].head))
2189 {
2190 ev_io_stop (EV_A_ w);
2191 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
2192 }
2193 }
2194
2195 /* check whether the given fd is actually valid, for error recovery */
2196 inline_size ecb_cold int
2197 fd_valid (int fd)
2198 {
2199 #ifdef _WIN32
2200 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
2201 #else
2202 return fcntl (fd, F_GETFD) != -1;
2203 #endif
2204 }
2205
2206 /* called on EBADF to verify fds */
2207 noinline ecb_cold
2208 static void
2209 fd_ebadf (EV_P)
2210 {
2211 int fd;
2212
2213 for (fd = 0; fd < anfdmax; ++fd)
2214 if (anfds [fd].events)
2215 if (!fd_valid (fd) && errno == EBADF)
2216 fd_kill (EV_A_ fd);
2217 }
2218
2219 /* called on ENOMEM in select/poll to kill some fds and retry */
2220 noinline ecb_cold
2221 static void
2222 fd_enomem (EV_P)
2223 {
2224 int fd;
2225
2226 for (fd = anfdmax; fd--; )
2227 if (anfds [fd].events)
2228 {
2229 fd_kill (EV_A_ fd);
2230 break;
2231 }
2232 }
2233
2234 /* usually called after fork if backend needs to re-arm all fds from scratch */
2235 noinline
2236 static void
2237 fd_rearm_all (EV_P)
2238 {
2239 int fd;
2240
2241 for (fd = 0; fd < anfdmax; ++fd)
2242 if (anfds [fd].events)
2243 {
2244 anfds [fd].events = 0;
2245 anfds [fd].emask = 0;
2246 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
2247 }
2248 }
2249
2250 /* used to prepare libev internal fd's */
2251 /* this is not fork-safe */
2252 inline_speed void
2253 fd_intern (int fd)
2254 {
2255 #ifdef _WIN32
2256 unsigned long arg = 1;
2257 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
2258 #else
2259 fcntl (fd, F_SETFD, FD_CLOEXEC);
2260 fcntl (fd, F_SETFL, O_NONBLOCK);
2261 #endif
2262 }
2263
2264 /*****************************************************************************/
2265
2266 /*
2267 * the heap functions want a real array index. array index 0 is guaranteed to not
2268 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
2269 * the branching factor of the d-tree.
2270 */
2271
2272 /*
2273 * at the moment we allow libev the luxury of two heaps,
2274 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
2275 * which is more cache-efficient.
2276 * the difference is about 5% with 50000+ watchers.
2277 */
2278 #if EV_USE_4HEAP
2279
2280 #define DHEAP 4
2281 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
2282 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
2283 #define UPHEAP_DONE(p,k) ((p) == (k))
2284
2285 /* away from the root */
2286 inline_speed void
2287 downheap (ANHE *heap, int N, int k)
2288 {
2289 ANHE he = heap [k];
2290 ANHE *E = heap + N + HEAP0;
2291
2292 for (;;)
2293 {
2294 ev_tstamp minat;
2295 ANHE *minpos;
2296 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
2297
2298 /* find minimum child */
2299 if (expect_true (pos + DHEAP - 1 < E))
2300 {
2301 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
2302 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
2303 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
2304 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
2305 }
2306 else if (pos < E)
2307 {
2308 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
2309 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
2310 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
2311 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
2312 }
2313 else
2314 break;
2315
2316 if (ANHE_at (he) <= minat)
2317 break;
2318
2319 heap [k] = *minpos;
2320 ev_active (ANHE_w (*minpos)) = k;
2321
2322 k = minpos - heap;
2323 }
2324
2325 heap [k] = he;
2326 ev_active (ANHE_w (he)) = k;
2327 }
2328
2329 #else /* 4HEAP */
2330
2331 #define HEAP0 1
2332 #define HPARENT(k) ((k) >> 1)
2333 #define UPHEAP_DONE(p,k) (!(p))
2334
2335 /* away from the root */
2336 inline_speed void
2337 downheap (ANHE *heap, int N, int k)
2338 {
2339 ANHE he = heap [k];
2340
2341 for (;;)
2342 {
2343 int c = k << 1;
2344
2345 if (c >= N + HEAP0)
2346 break;
2347
2348 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
2349 ? 1 : 0;
2350
2351 if (ANHE_at (he) <= ANHE_at (heap [c]))
2352 break;
2353
2354 heap [k] = heap [c];
2355 ev_active (ANHE_w (heap [k])) = k;
2356
2357 k = c;
2358 }
2359
2360 heap [k] = he;
2361 ev_active (ANHE_w (he)) = k;
2362 }
2363 #endif
2364
2365 /* towards the root */
2366 inline_speed void
2367 upheap (ANHE *heap, int k)
2368 {
2369 ANHE he = heap [k];
2370
2371 for (;;)
2372 {
2373 int p = HPARENT (k);
2374
2375 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
2376 break;
2377
2378 heap [k] = heap [p];
2379 ev_active (ANHE_w (heap [k])) = k;
2380 k = p;
2381 }
2382
2383 heap [k] = he;
2384 ev_active (ANHE_w (he)) = k;
2385 }
2386
2387 /* move an element suitably so it is in a correct place */
2388 inline_size void
2389 adjustheap (ANHE *heap, int N, int k)
2390 {
2391 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
2392 upheap (heap, k);
2393 else
2394 downheap (heap, N, k);
2395 }
2396
2397 /* rebuild the heap: this function is used only once and executed rarely */
2398 inline_size void
2399 reheap (ANHE *heap, int N)
2400 {
2401 int i;
2402
2403 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
2404 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
2405 for (i = 0; i < N; ++i)
2406 upheap (heap, i + HEAP0);
2407 }
2408
2409 /*****************************************************************************/
2410
2411 /* associate signal watchers to a signal signal */
2412 typedef struct
2413 {
2414 EV_ATOMIC_T pending;
2415 #if EV_MULTIPLICITY
2416 EV_P;
2417 #endif
2418 WL head;
2419 } ANSIG;
2420
2421 static ANSIG signals [EV_NSIG - 1];
2422
2423 /*****************************************************************************/
2424
2425 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2426
2427 noinline ecb_cold
2428 static void
2429 evpipe_init (EV_P)
2430 {
2431 if (!ev_is_active (&pipe_w))
2432 {
2433 int fds [2];
2434
2435 # if EV_USE_EVENTFD
2436 fds [0] = -1;
2437 fds [1] = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
2438 if (fds [1] < 0 && errno == EINVAL)
2439 fds [1] = eventfd (0, 0);
2440
2441 if (fds [1] < 0)
2442 # endif
2443 {
2444 while (pipe (fds))
2445 ev_syserr ("(libev) error creating signal/async pipe");
2446
2447 fd_intern (fds [0]);
2448 }
2449
2450 evpipe [0] = fds [0];
2451
2452 if (evpipe [1] < 0)
2453 evpipe [1] = fds [1]; /* first call, set write fd */
2454 else
2455 {
2456 /* on subsequent calls, do not change evpipe [1] */
2457 /* so that evpipe_write can always rely on its value. */
2458 /* this branch does not do anything sensible on windows, */
2459 /* so must not be executed on windows */
2460
2461 dup2 (fds [1], evpipe [1]);
2462 close (fds [1]);
2463 }
2464
2465 fd_intern (evpipe [1]);
2466
2467 ev_io_set (&pipe_w, evpipe [0] < 0 ? evpipe [1] : evpipe [0], EV_READ);
2468 ev_io_start (EV_A_ &pipe_w);
2469 ev_unref (EV_A); /* watcher should not keep loop alive */
2470 }
2471 }
2472
2473 inline_speed void
2474 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
2475 {
2476 ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
2477
2478 if (expect_true (*flag))
2479 return;
2480
2481 *flag = 1;
2482 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
2483
2484 pipe_write_skipped = 1;
2485
2486 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
2487
2488 if (pipe_write_wanted)
2489 {
2490 int old_errno;
2491
2492 pipe_write_skipped = 0;
2493 ECB_MEMORY_FENCE_RELEASE;
2494
2495 old_errno = errno; /* save errno because write will clobber it */
2496
2497 #if EV_USE_EVENTFD
2498 if (evpipe [0] < 0)
2499 {
2500 uint64_t counter = 1;
2501 write (evpipe [1], &counter, sizeof (uint64_t));
2502 }
2503 else
2504 #endif
2505 {
2506 #ifdef _WIN32
2507 WSABUF buf;
2508 DWORD sent;
2509 buf.buf = (char *)&buf;
2510 buf.len = 1;
2511 WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
2512 #else
2513 write (evpipe [1], &(evpipe [1]), 1);
2514 #endif
2515 }
2516
2517 errno = old_errno;
2518 }
2519 }
2520
2521 /* called whenever the libev signal pipe */
2522 /* got some events (signal, async) */
2523 static void
2524 pipecb (EV_P_ ev_io *iow, int revents)
2525 {
2526 int i;
2527
2528 if (revents & EV_READ)
2529 {
2530 #if EV_USE_EVENTFD
2531 if (evpipe [0] < 0)
2532 {
2533 uint64_t counter;
2534 read (evpipe [1], &counter, sizeof (uint64_t));
2535 }
2536 else
2537 #endif
2538 {
2539 char dummy[4];
2540 #ifdef _WIN32
2541 WSABUF buf;
2542 DWORD recvd;
2543 DWORD flags = 0;
2544 buf.buf = dummy;
2545 buf.len = sizeof (dummy);
2546 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
2547 #else
2548 read (evpipe [0], &dummy, sizeof (dummy));
2549 #endif
2550 }
2551 }
2552
2553 pipe_write_skipped = 0;
2554
2555 ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
2556
2557 #if EV_SIGNAL_ENABLE
2558 if (sig_pending)
2559 {
2560 sig_pending = 0;
2561
2562 ECB_MEMORY_FENCE;
2563
2564 for (i = EV_NSIG - 1; i--; )
2565 if (expect_false (signals [i].pending))
2566 ev_feed_signal_event (EV_A_ i + 1);
2567 }
2568 #endif
2569
2570 #if EV_ASYNC_ENABLE
2571 if (async_pending)
2572 {
2573 async_pending = 0;
2574
2575 ECB_MEMORY_FENCE;
2576
2577 for (i = asynccnt; i--; )
2578 if (asyncs [i]->sent)
2579 {
2580 asyncs [i]->sent = 0;
2581 ECB_MEMORY_FENCE_RELEASE;
2582 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
2583 }
2584 }
2585 #endif
2586 }
2587
2588 /*****************************************************************************/
2589
2590 void
2591 ev_feed_signal (int signum) EV_NOEXCEPT
2592 {
2593 #if EV_MULTIPLICITY
2594 EV_P;
2595 ECB_MEMORY_FENCE_ACQUIRE;
2596 EV_A = signals [signum - 1].loop;
2597
2598 if (!EV_A)
2599 return;
2600 #endif
2601
2602 signals [signum - 1].pending = 1;
2603 evpipe_write (EV_A_ &sig_pending);
2604 }
2605
2606 static void
2607 ev_sighandler (int signum)
2608 {
2609 #ifdef _WIN32
2610 signal (signum, ev_sighandler);
2611 #endif
2612
2613 ev_feed_signal (signum);
2614 }
2615
2616 noinline
2617 void
2618 ev_feed_signal_event (EV_P_ int signum) EV_NOEXCEPT
2619 {
2620 WL w;
2621
2622 if (expect_false (signum <= 0 || signum >= EV_NSIG))
2623 return;
2624
2625 --signum;
2626
2627 #if EV_MULTIPLICITY
2628 /* it is permissible to try to feed a signal to the wrong loop */
2629 /* or, likely more useful, feeding a signal nobody is waiting for */
2630
2631 if (expect_false (signals [signum].loop != EV_A))
2632 return;
2633 #endif
2634
2635 signals [signum].pending = 0;
2636 ECB_MEMORY_FENCE_RELEASE;
2637
2638 for (w = signals [signum].head; w; w = w->next)
2639 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2640 }
2641
2642 #if EV_USE_SIGNALFD
2643 static void
2644 sigfdcb (EV_P_ ev_io *iow, int revents)
2645 {
2646 struct signalfd_siginfo si[2], *sip; /* these structs are big */
2647
2648 for (;;)
2649 {
2650 ssize_t res = read (sigfd, si, sizeof (si));
2651
2652 /* not ISO-C, as res might be -1, but works with SuS */
2653 for (sip = si; (char *)sip < (char *)si + res; ++sip)
2654 ev_feed_signal_event (EV_A_ sip->ssi_signo);
2655
2656 if (res < (ssize_t)sizeof (si))
2657 break;
2658 }
2659 }
2660 #endif
2661
2662 #endif
2663
2664 /*****************************************************************************/
2665
2666 #if EV_CHILD_ENABLE
2667 static WL childs [EV_PID_HASHSIZE];
2668
2669 static ev_signal childev;
2670
2671 #ifndef WIFCONTINUED
2672 # define WIFCONTINUED(status) 0
2673 #endif
2674
2675 /* handle a single child status event */
2676 inline_speed void
2677 child_reap (EV_P_ int chain, int pid, int status)
2678 {
2679 ev_child *w;
2680 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2681
2682 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2683 {
2684 if ((w->pid == pid || !w->pid)
2685 && (!traced || (w->flags & 1)))
2686 {
2687 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2688 w->rpid = pid;
2689 w->rstatus = status;
2690 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2691 }
2692 }
2693 }
2694
2695 #ifndef WCONTINUED
2696 # define WCONTINUED 0
2697 #endif
2698
2699 /* called on sigchld etc., calls waitpid */
2700 static void
2701 childcb (EV_P_ ev_signal *sw, int revents)
2702 {
2703 int pid, status;
2704
2705 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
2706 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
2707 if (!WCONTINUED
2708 || errno != EINVAL
2709 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2710 return;
2711
2712 /* make sure we are called again until all children have been reaped */
2713 /* we need to do it this way so that the callback gets called before we continue */
2714 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2715
2716 child_reap (EV_A_ pid, pid, status);
2717 if ((EV_PID_HASHSIZE) > 1)
2718 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2719 }
2720
2721 #endif
2722
2723 /*****************************************************************************/
2724
2725 #if EV_USE_IOCP
2726 # include "ev_iocp.c"
2727 #endif
2728 #if EV_USE_PORT
2729 # include "ev_port.c"
2730 #endif
2731 #if EV_USE_KQUEUE
2732 # include "ev_kqueue.c"
2733 #endif
2734 #if EV_USE_LINUXAIO
2735 # include "ev_linuxaio.c"
2736 #endif
2737 #if EV_USE_EPOLL
2738 # include "ev_epoll.c"
2739 #endif
2740 #if EV_USE_POLL
2741 # include "ev_poll.c"
2742 #endif
2743 #if EV_USE_SELECT
2744 # include "ev_select.c"
2745 #endif
2746
2747 ecb_cold int
2748 ev_version_major (void) EV_NOEXCEPT
2749 {
2750 return EV_VERSION_MAJOR;
2751 }
2752
2753 ecb_cold int
2754 ev_version_minor (void) EV_NOEXCEPT
2755 {
2756 return EV_VERSION_MINOR;
2757 }
2758
2759 /* return true if we are running with elevated privileges and should ignore env variables */
2760 inline_size ecb_cold int
2761 enable_secure (void)
2762 {
2763 #ifdef _WIN32
2764 return 0;
2765 #else
2766 return getuid () != geteuid ()
2767 || getgid () != getegid ();
2768 #endif
2769 }
2770
2771 ecb_cold
2772 unsigned int
2773 ev_supported_backends (void) EV_NOEXCEPT
2774 {
2775 unsigned int flags = 0;
2776
2777 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2778 if (EV_USE_KQUEUE ) flags |= EVBACKEND_KQUEUE;
2779 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2780 if (EV_USE_LINUXAIO) flags |= EVBACKEND_LINUXAIO;
2781 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2782 if (EV_USE_SELECT ) flags |= EVBACKEND_SELECT;
2783
2784 return flags;
2785 }
2786
2787 ecb_cold
2788 unsigned int
2789 ev_recommended_backends (void) EV_NOEXCEPT
2790 {
2791 unsigned int flags = ev_supported_backends ();
2792
2793 #ifndef __NetBSD__
2794 /* kqueue is borked on everything but netbsd apparently */
2795 /* it usually doesn't work correctly on anything but sockets and pipes */
2796 flags &= ~EVBACKEND_KQUEUE;
2797 #endif
2798 #ifdef __APPLE__
2799 /* only select works correctly on that "unix-certified" platform */
2800 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2801 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2802 #endif
2803 #ifdef __FreeBSD__
2804 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2805 #endif
2806
2807 /* TODO: linuxaio is very experimental */
2808 flags &= ~EVBACKEND_LINUXAIO;
2809
2810 return flags;
2811 }
2812
2813 ecb_cold
2814 unsigned int
2815 ev_embeddable_backends (void) EV_NOEXCEPT
2816 {
2817 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2818
2819 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2820 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2821 flags &= ~EVBACKEND_EPOLL;
2822
2823 return flags;
2824 }
2825
2826 unsigned int
2827 ev_backend (EV_P) EV_NOEXCEPT
2828 {
2829 return backend;
2830 }
2831
2832 #if EV_FEATURE_API
2833 unsigned int
2834 ev_iteration (EV_P) EV_NOEXCEPT
2835 {
2836 return loop_count;
2837 }
2838
2839 unsigned int
2840 ev_depth (EV_P) EV_NOEXCEPT
2841 {
2842 return loop_depth;
2843 }
2844
2845 void
2846 ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_NOEXCEPT
2847 {
2848 io_blocktime = interval;
2849 }
2850
2851 void
2852 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_NOEXCEPT
2853 {
2854 timeout_blocktime = interval;
2855 }
2856
2857 void
2858 ev_set_userdata (EV_P_ void *data) EV_NOEXCEPT
2859 {
2860 userdata = data;
2861 }
2862
2863 void *
2864 ev_userdata (EV_P) EV_NOEXCEPT
2865 {
2866 return userdata;
2867 }
2868
2869 void
2870 ev_set_invoke_pending_cb (EV_P_ ev_loop_callback invoke_pending_cb) EV_NOEXCEPT
2871 {
2872 invoke_cb = invoke_pending_cb;
2873 }
2874
2875 void
2876 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_NOEXCEPT, void (*acquire)(EV_P) EV_NOEXCEPT) EV_NOEXCEPT
2877 {
2878 release_cb = release;
2879 acquire_cb = acquire;
2880 }
2881 #endif
2882
2883 /* initialise a loop structure, must be zero-initialised */
2884 noinline ecb_cold
2885 static void
2886 loop_init (EV_P_ unsigned int flags) EV_NOEXCEPT
2887 {
2888 if (!backend)
2889 {
2890 origflags = flags;
2891
2892 #if EV_USE_REALTIME
2893 if (!have_realtime)
2894 {
2895 struct timespec ts;
2896
2897 if (!clock_gettime (CLOCK_REALTIME, &ts))
2898 have_realtime = 1;
2899 }
2900 #endif
2901
2902 #if EV_USE_MONOTONIC
2903 if (!have_monotonic)
2904 {
2905 struct timespec ts;
2906
2907 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2908 have_monotonic = 1;
2909 }
2910 #endif
2911
2912 /* pid check not overridable via env */
2913 #ifndef _WIN32
2914 if (flags & EVFLAG_FORKCHECK)
2915 curpid = getpid ();
2916 #endif
2917
2918 if (!(flags & EVFLAG_NOENV)
2919 && !enable_secure ()
2920 && getenv ("LIBEV_FLAGS"))
2921 flags = atoi (getenv ("LIBEV_FLAGS"));
2922
2923 ev_rt_now = ev_time ();
2924 mn_now = get_clock ();
2925 now_floor = mn_now;
2926 rtmn_diff = ev_rt_now - mn_now;
2927 #if EV_FEATURE_API
2928 invoke_cb = ev_invoke_pending;
2929 #endif
2930
2931 io_blocktime = 0.;
2932 timeout_blocktime = 0.;
2933 backend = 0;
2934 backend_fd = -1;
2935 sig_pending = 0;
2936 #if EV_ASYNC_ENABLE
2937 async_pending = 0;
2938 #endif
2939 pipe_write_skipped = 0;
2940 pipe_write_wanted = 0;
2941 evpipe [0] = -1;
2942 evpipe [1] = -1;
2943 #if EV_USE_INOTIFY
2944 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2945 #endif
2946 #if EV_USE_SIGNALFD
2947 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2948 #endif
2949
2950 if (!(flags & EVBACKEND_MASK))
2951 flags |= ev_recommended_backends ();
2952
2953 #if EV_USE_IOCP
2954 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2955 #endif
2956 #if EV_USE_PORT
2957 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2958 #endif
2959 #if EV_USE_KQUEUE
2960 if (!backend && (flags & EVBACKEND_KQUEUE )) backend = kqueue_init (EV_A_ flags);
2961 #endif
2962 #if EV_USE_LINUXAIO
2963 if (!backend && (flags & EVBACKEND_LINUXAIO)) backend = linuxaio_init (EV_A_ flags);
2964 #endif
2965 #if EV_USE_EPOLL
2966 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2967 #endif
2968 #if EV_USE_POLL
2969 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2970 #endif
2971 #if EV_USE_SELECT
2972 if (!backend && (flags & EVBACKEND_SELECT )) backend = select_init (EV_A_ flags);
2973 #endif
2974
2975 ev_prepare_init (&pending_w, pendingcb);
2976
2977 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2978 ev_init (&pipe_w, pipecb);
2979 ev_set_priority (&pipe_w, EV_MAXPRI);
2980 #endif
2981 }
2982 }
2983
2984 /* free up a loop structure */
2985 ecb_cold
2986 void
2987 ev_loop_destroy (EV_P)
2988 {
2989 int i;
2990
2991 #if EV_MULTIPLICITY
2992 /* mimic free (0) */
2993 if (!EV_A)
2994 return;
2995 #endif
2996
2997 #if EV_CLEANUP_ENABLE
2998 /* queue cleanup watchers (and execute them) */
2999 if (expect_false (cleanupcnt))
3000 {
3001 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
3002 EV_INVOKE_PENDING;
3003 }
3004 #endif
3005
3006 #if EV_CHILD_ENABLE
3007 if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
3008 {
3009 ev_ref (EV_A); /* child watcher */
3010 ev_signal_stop (EV_A_ &childev);
3011 }
3012 #endif
3013
3014 if (ev_is_active (&pipe_w))
3015 {
3016 /*ev_ref (EV_A);*/
3017 /*ev_io_stop (EV_A_ &pipe_w);*/
3018
3019 if (evpipe [0] >= 0) EV_WIN32_CLOSE_FD (evpipe [0]);
3020 if (evpipe [1] >= 0) EV_WIN32_CLOSE_FD (evpipe [1]);
3021 }
3022
3023 #if EV_USE_SIGNALFD
3024 if (ev_is_active (&sigfd_w))
3025 close (sigfd);
3026 #endif
3027
3028 #if EV_USE_INOTIFY
3029 if (fs_fd >= 0)
3030 close (fs_fd);
3031 #endif
3032
3033 if (backend_fd >= 0)
3034 close (backend_fd);
3035
3036 #if EV_USE_IOCP
3037 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
3038 #endif
3039 #if EV_USE_PORT
3040 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
3041 #endif
3042 #if EV_USE_KQUEUE
3043 if (backend == EVBACKEND_KQUEUE ) kqueue_destroy (EV_A);
3044 #endif
3045 #if EV_USE_LINUXAIO
3046 if (backend == EVBACKEND_LINUXAIO) linuxaio_destroy (EV_A);
3047 #endif
3048 #if EV_USE_EPOLL
3049 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
3050 #endif
3051 #if EV_USE_POLL
3052 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
3053 #endif
3054 #if EV_USE_SELECT
3055 if (backend == EVBACKEND_SELECT ) select_destroy (EV_A);
3056 #endif
3057
3058 for (i = NUMPRI; i--; )
3059 {
3060 array_free (pending, [i]);
3061 #if EV_IDLE_ENABLE
3062 array_free (idle, [i]);
3063 #endif
3064 }
3065
3066 ev_free (anfds); anfds = 0; anfdmax = 0;
3067
3068 /* have to use the microsoft-never-gets-it-right macro */
3069 array_free (rfeed, EMPTY);
3070 array_free (fdchange, EMPTY);
3071 array_free (timer, EMPTY);
3072 #if EV_PERIODIC_ENABLE
3073 array_free (periodic, EMPTY);
3074 #endif
3075 #if EV_FORK_ENABLE
3076 array_free (fork, EMPTY);
3077 #endif
3078 #if EV_CLEANUP_ENABLE
3079 array_free (cleanup, EMPTY);
3080 #endif
3081 array_free (prepare, EMPTY);
3082 array_free (check, EMPTY);
3083 #if EV_ASYNC_ENABLE
3084 array_free (async, EMPTY);
3085 #endif
3086
3087 backend = 0;
3088
3089 #if EV_MULTIPLICITY
3090 if (ev_is_default_loop (EV_A))
3091 #endif
3092 ev_default_loop_ptr = 0;
3093 #if EV_MULTIPLICITY
3094 else
3095 ev_free (EV_A);
3096 #endif
3097 }
3098
3099 #if EV_USE_INOTIFY
3100 inline_size void infy_fork (EV_P);
3101 #endif
3102
3103 inline_size void
3104 loop_fork (EV_P)
3105 {
3106 #if EV_USE_PORT
3107 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
3108 #endif
3109 #if EV_USE_KQUEUE
3110 if (backend == EVBACKEND_KQUEUE ) kqueue_fork (EV_A);
3111 #endif
3112 #if EV_USE_LINUXAIO
3113 if (backend == EVBACKEND_LINUXAIO) linuxaio_fork (EV_A);
3114 #endif
3115 #if EV_USE_EPOLL
3116 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
3117 #endif
3118 #if EV_USE_INOTIFY
3119 infy_fork (EV_A);
3120 #endif
3121
3122 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
3123 if (ev_is_active (&pipe_w) && postfork != 2)
3124 {
3125 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
3126
3127 ev_ref (EV_A);
3128 ev_io_stop (EV_A_ &pipe_w);
3129
3130 if (evpipe [0] >= 0)
3131 EV_WIN32_CLOSE_FD (evpipe [0]);
3132
3133 evpipe_init (EV_A);
3134 /* iterate over everything, in case we missed something before */
3135 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3136 }
3137 #endif
3138
3139 postfork = 0;
3140 }
3141
3142 #if EV_MULTIPLICITY
3143
3144 ecb_cold
3145 struct ev_loop *
3146 ev_loop_new (unsigned int flags) EV_NOEXCEPT
3147 {
3148 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
3149
3150 memset (EV_A, 0, sizeof (struct ev_loop));
3151 loop_init (EV_A_ flags);
3152
3153 if (ev_backend (EV_A))
3154 return EV_A;
3155
3156 ev_free (EV_A);
3157 return 0;
3158 }
3159
3160 #endif /* multiplicity */
3161
3162 #if EV_VERIFY
3163 noinline ecb_cold
3164 static void
3165 verify_watcher (EV_P_ W w)
3166 {
3167 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
3168
3169 if (w->pending)
3170 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
3171 }
3172
3173 noinline ecb_cold
3174 static void
3175 verify_heap (EV_P_ ANHE *heap, int N)
3176 {
3177 int i;
3178
3179 for (i = HEAP0; i < N + HEAP0; ++i)
3180 {
3181 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
3182 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
3183 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
3184
3185 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
3186 }
3187 }
3188
3189 noinline ecb_cold
3190 static void
3191 array_verify (EV_P_ W *ws, int cnt)
3192 {
3193 while (cnt--)
3194 {
3195 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
3196 verify_watcher (EV_A_ ws [cnt]);
3197 }
3198 }
3199 #endif
3200
3201 #if EV_FEATURE_API
3202 void ecb_cold
3203 ev_verify (EV_P) EV_NOEXCEPT
3204 {
3205 #if EV_VERIFY
3206 int i;
3207 WL w, w2;
3208
3209 assert (activecnt >= -1);
3210
3211 assert (fdchangemax >= fdchangecnt);
3212 for (i = 0; i < fdchangecnt; ++i)
3213 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
3214
3215 assert (anfdmax >= 0);
3216 for (i = 0; i < anfdmax; ++i)
3217 {
3218 int j = 0;
3219
3220 for (w = w2 = anfds [i].head; w; w = w->next)
3221 {
3222 verify_watcher (EV_A_ (W)w);
3223
3224 if (j++ & 1)
3225 {
3226 assert (("libev: io watcher list contains a loop", w != w2));
3227 w2 = w2->next;
3228 }
3229
3230 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
3231 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
3232 }
3233 }
3234
3235 assert (timermax >= timercnt);
3236 verify_heap (EV_A_ timers, timercnt);
3237
3238 #if EV_PERIODIC_ENABLE
3239 assert (periodicmax >= periodiccnt);
3240 verify_heap (EV_A_ periodics, periodiccnt);
3241 #endif
3242
3243 for (i = NUMPRI; i--; )
3244 {
3245 assert (pendingmax [i] >= pendingcnt [i]);
3246 #if EV_IDLE_ENABLE
3247 assert (idleall >= 0);
3248 assert (idlemax [i] >= idlecnt [i]);
3249 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
3250 #endif
3251 }
3252
3253 #if EV_FORK_ENABLE
3254 assert (forkmax >= forkcnt);
3255 array_verify (EV_A_ (W *)forks, forkcnt);
3256 #endif
3257
3258 #if EV_CLEANUP_ENABLE
3259 assert (cleanupmax >= cleanupcnt);
3260 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
3261 #endif
3262
3263 #if EV_ASYNC_ENABLE
3264 assert (asyncmax >= asynccnt);
3265 array_verify (EV_A_ (W *)asyncs, asynccnt);
3266 #endif
3267
3268 #if EV_PREPARE_ENABLE
3269 assert (preparemax >= preparecnt);
3270 array_verify (EV_A_ (W *)prepares, preparecnt);
3271 #endif
3272
3273 #if EV_CHECK_ENABLE
3274 assert (checkmax >= checkcnt);
3275 array_verify (EV_A_ (W *)checks, checkcnt);
3276 #endif
3277
3278 # if 0
3279 #if EV_CHILD_ENABLE
3280 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
3281 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
3282 #endif
3283 # endif
3284 #endif
3285 }
3286 #endif
3287
3288 #if EV_MULTIPLICITY
3289 ecb_cold
3290 struct ev_loop *
3291 #else
3292 int
3293 #endif
3294 ev_default_loop (unsigned int flags) EV_NOEXCEPT
3295 {
3296 if (!ev_default_loop_ptr)
3297 {
3298 #if EV_MULTIPLICITY
3299 EV_P = ev_default_loop_ptr = &default_loop_struct;
3300 #else
3301 ev_default_loop_ptr = 1;
3302 #endif
3303
3304 loop_init (EV_A_ flags);
3305
3306 if (ev_backend (EV_A))
3307 {
3308 #if EV_CHILD_ENABLE
3309 ev_signal_init (&childev, childcb, SIGCHLD);
3310 ev_set_priority (&childev, EV_MAXPRI);
3311 ev_signal_start (EV_A_ &childev);
3312 ev_unref (EV_A); /* child watcher should not keep loop alive */
3313 #endif
3314 }
3315 else
3316 ev_default_loop_ptr = 0;
3317 }
3318
3319 return ev_default_loop_ptr;
3320 }
3321
3322 void
3323 ev_loop_fork (EV_P) EV_NOEXCEPT
3324 {
3325 postfork = 1;
3326 }
3327
3328 /*****************************************************************************/
3329
3330 void
3331 ev_invoke (EV_P_ void *w, int revents)
3332 {
3333 EV_CB_INVOKE ((W)w, revents);
3334 }
3335
3336 unsigned int
3337 ev_pending_count (EV_P) EV_NOEXCEPT
3338 {
3339 int pri;
3340 unsigned int count = 0;
3341
3342 for (pri = NUMPRI; pri--; )
3343 count += pendingcnt [pri];
3344
3345 return count;
3346 }
3347
3348 noinline
3349 void
3350 ev_invoke_pending (EV_P)
3351 {
3352 pendingpri = NUMPRI;
3353
3354 do
3355 {
3356 --pendingpri;
3357
3358 /* pendingpri possibly gets modified in the inner loop */
3359 while (pendingcnt [pendingpri])
3360 {
3361 ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
3362
3363 p->w->pending = 0;
3364 EV_CB_INVOKE (p->w, p->events);
3365 EV_FREQUENT_CHECK;
3366 }
3367 }
3368 while (pendingpri);
3369 }
3370
3371 #if EV_IDLE_ENABLE
3372 /* make idle watchers pending. this handles the "call-idle */
3373 /* only when higher priorities are idle" logic */
3374 inline_size void
3375 idle_reify (EV_P)
3376 {
3377 if (expect_false (idleall))
3378 {
3379 int pri;
3380
3381 for (pri = NUMPRI; pri--; )
3382 {
3383 if (pendingcnt [pri])
3384 break;
3385
3386 if (idlecnt [pri])
3387 {
3388 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
3389 break;
3390 }
3391 }
3392 }
3393 }
3394 #endif
3395
3396 /* make timers pending */
3397 inline_size void
3398 timers_reify (EV_P)
3399 {
3400 EV_FREQUENT_CHECK;
3401
3402 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
3403 {
3404 do
3405 {
3406 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
3407
3408 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
3409
3410 /* first reschedule or stop timer */
3411 if (w->repeat)
3412 {
3413 ev_at (w) += w->repeat;
3414 if (ev_at (w) < mn_now)
3415 ev_at (w) = mn_now;
3416
3417 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
3418
3419 ANHE_at_cache (timers [HEAP0]);
3420 downheap (timers, timercnt, HEAP0);
3421 }
3422 else
3423 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
3424
3425 EV_FREQUENT_CHECK;
3426 feed_reverse (EV_A_ (W)w);
3427 }
3428 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
3429
3430 feed_reverse_done (EV_A_ EV_TIMER);
3431 }
3432 }
3433
3434 #if EV_PERIODIC_ENABLE
3435
3436 noinline
3437 static void
3438 periodic_recalc (EV_P_ ev_periodic *w)
3439 {
3440 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
3441 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
3442
3443 /* the above almost always errs on the low side */
3444 while (at <= ev_rt_now)
3445 {
3446 ev_tstamp nat = at + w->interval;
3447
3448 /* when resolution fails us, we use ev_rt_now */
3449 if (expect_false (nat == at))
3450 {
3451 at = ev_rt_now;
3452 break;
3453 }
3454
3455 at = nat;
3456 }
3457
3458 ev_at (w) = at;
3459 }
3460
3461 /* make periodics pending */
3462 inline_size void
3463 periodics_reify (EV_P)
3464 {
3465 EV_FREQUENT_CHECK;
3466
3467 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
3468 {
3469 do
3470 {
3471 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
3472
3473 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
3474
3475 /* first reschedule or stop timer */
3476 if (w->reschedule_cb)
3477 {
3478 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3479
3480 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
3481
3482 ANHE_at_cache (periodics [HEAP0]);
3483 downheap (periodics, periodiccnt, HEAP0);
3484 }
3485 else if (w->interval)
3486 {
3487 periodic_recalc (EV_A_ w);
3488 ANHE_at_cache (periodics [HEAP0]);
3489 downheap (periodics, periodiccnt, HEAP0);
3490 }
3491 else
3492 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
3493
3494 EV_FREQUENT_CHECK;
3495 feed_reverse (EV_A_ (W)w);
3496 }
3497 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
3498
3499 feed_reverse_done (EV_A_ EV_PERIODIC);
3500 }
3501 }
3502
3503 /* simply recalculate all periodics */
3504 /* TODO: maybe ensure that at least one event happens when jumping forward? */
3505 noinline ecb_cold
3506 static void
3507 periodics_reschedule (EV_P)
3508 {
3509 int i;
3510
3511 /* adjust periodics after time jump */
3512 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
3513 {
3514 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
3515
3516 if (w->reschedule_cb)
3517 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3518 else if (w->interval)
3519 periodic_recalc (EV_A_ w);
3520
3521 ANHE_at_cache (periodics [i]);
3522 }
3523
3524 reheap (periodics, periodiccnt);
3525 }
3526 #endif
3527
3528 /* adjust all timers by a given offset */
3529 noinline ecb_cold
3530 static void
3531 timers_reschedule (EV_P_ ev_tstamp adjust)
3532 {
3533 int i;
3534
3535 for (i = 0; i < timercnt; ++i)
3536 {
3537 ANHE *he = timers + i + HEAP0;
3538 ANHE_w (*he)->at += adjust;
3539 ANHE_at_cache (*he);
3540 }
3541 }
3542
3543 /* fetch new monotonic and realtime times from the kernel */
3544 /* also detect if there was a timejump, and act accordingly */
3545 inline_speed void
3546 time_update (EV_P_ ev_tstamp max_block)
3547 {
3548 #if EV_USE_MONOTONIC
3549 if (expect_true (have_monotonic))
3550 {
3551 int i;
3552 ev_tstamp odiff = rtmn_diff;
3553
3554 mn_now = get_clock ();
3555
3556 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
3557 /* interpolate in the meantime */
3558 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
3559 {
3560 ev_rt_now = rtmn_diff + mn_now;
3561 return;
3562 }
3563
3564 now_floor = mn_now;
3565 ev_rt_now = ev_time ();
3566
3567 /* loop a few times, before making important decisions.
3568 * on the choice of "4": one iteration isn't enough,
3569 * in case we get preempted during the calls to
3570 * ev_time and get_clock. a second call is almost guaranteed
3571 * to succeed in that case, though. and looping a few more times
3572 * doesn't hurt either as we only do this on time-jumps or
3573 * in the unlikely event of having been preempted here.
3574 */
3575 for (i = 4; --i; )
3576 {
3577 ev_tstamp diff;
3578 rtmn_diff = ev_rt_now - mn_now;
3579
3580 diff = odiff - rtmn_diff;
3581
3582 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
3583 return; /* all is well */
3584
3585 ev_rt_now = ev_time ();
3586 mn_now = get_clock ();
3587 now_floor = mn_now;
3588 }
3589
3590 /* no timer adjustment, as the monotonic clock doesn't jump */
3591 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
3592 # if EV_PERIODIC_ENABLE
3593 periodics_reschedule (EV_A);
3594 # endif
3595 }
3596 else
3597 #endif
3598 {
3599 ev_rt_now = ev_time ();
3600
3601 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
3602 {
3603 /* adjust timers. this is easy, as the offset is the same for all of them */
3604 timers_reschedule (EV_A_ ev_rt_now - mn_now);
3605 #if EV_PERIODIC_ENABLE
3606 periodics_reschedule (EV_A);
3607 #endif
3608 }
3609
3610 mn_now = ev_rt_now;
3611 }
3612 }
3613
3614 int
3615 ev_run (EV_P_ int flags)
3616 {
3617 #if EV_FEATURE_API
3618 ++loop_depth;
3619 #endif
3620
3621 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
3622
3623 loop_done = EVBREAK_CANCEL;
3624
3625 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
3626
3627 do
3628 {
3629 #if EV_VERIFY >= 2
3630 ev_verify (EV_A);
3631 #endif
3632
3633 #ifndef _WIN32
3634 if (expect_false (curpid)) /* penalise the forking check even more */
3635 if (expect_false (getpid () != curpid))
3636 {
3637 curpid = getpid ();
3638 postfork = 1;
3639 }
3640 #endif
3641
3642 #if EV_FORK_ENABLE
3643 /* we might have forked, so queue fork handlers */
3644 if (expect_false (postfork))
3645 if (forkcnt)
3646 {
3647 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
3648 EV_INVOKE_PENDING;
3649 }
3650 #endif
3651
3652 #if EV_PREPARE_ENABLE
3653 /* queue prepare watchers (and execute them) */
3654 if (expect_false (preparecnt))
3655 {
3656 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
3657 EV_INVOKE_PENDING;
3658 }
3659 #endif
3660
3661 if (expect_false (loop_done))
3662 break;
3663
3664 /* we might have forked, so reify kernel state if necessary */
3665 if (expect_false (postfork))
3666 loop_fork (EV_A);
3667
3668 /* update fd-related kernel structures */
3669 fd_reify (EV_A);
3670
3671 /* calculate blocking time */
3672 {
3673 ev_tstamp waittime = 0.;
3674 ev_tstamp sleeptime = 0.;
3675
3676 /* remember old timestamp for io_blocktime calculation */
3677 ev_tstamp prev_mn_now = mn_now;
3678
3679 /* update time to cancel out callback processing overhead */
3680 time_update (EV_A_ 1e100);
3681
3682 /* from now on, we want a pipe-wake-up */
3683 pipe_write_wanted = 1;
3684
3685 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3686
3687 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3688 {
3689 waittime = MAX_BLOCKTIME;
3690
3691 if (timercnt)
3692 {
3693 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3694 if (waittime > to) waittime = to;
3695 }
3696
3697 #if EV_PERIODIC_ENABLE
3698 if (periodiccnt)
3699 {
3700 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3701 if (waittime > to) waittime = to;
3702 }
3703 #endif
3704
3705 /* don't let timeouts decrease the waittime below timeout_blocktime */
3706 if (expect_false (waittime < timeout_blocktime))
3707 waittime = timeout_blocktime;
3708
3709 /* at this point, we NEED to wait, so we have to ensure */
3710 /* to pass a minimum nonzero value to the backend */
3711 if (expect_false (waittime < backend_mintime))
3712 waittime = backend_mintime;
3713
3714 /* extra check because io_blocktime is commonly 0 */
3715 if (expect_false (io_blocktime))
3716 {
3717 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3718
3719 if (sleeptime > waittime - backend_mintime)
3720 sleeptime = waittime - backend_mintime;
3721
3722 if (expect_true (sleeptime > 0.))
3723 {
3724 ev_sleep (sleeptime);
3725 waittime -= sleeptime;
3726 }
3727 }
3728 }
3729
3730 #if EV_FEATURE_API
3731 ++loop_count;
3732 #endif
3733 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3734 backend_poll (EV_A_ waittime);
3735 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3736
3737 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3738
3739 ECB_MEMORY_FENCE_ACQUIRE;
3740 if (pipe_write_skipped)
3741 {
3742 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3743 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3744 }
3745
3746
3747 /* update ev_rt_now, do magic */
3748 time_update (EV_A_ waittime + sleeptime);
3749 }
3750
3751 /* queue pending timers and reschedule them */
3752 timers_reify (EV_A); /* relative timers called last */
3753 #if EV_PERIODIC_ENABLE
3754 periodics_reify (EV_A); /* absolute timers called first */
3755 #endif
3756
3757 #if EV_IDLE_ENABLE
3758 /* queue idle watchers unless other events are pending */
3759 idle_reify (EV_A);
3760 #endif
3761
3762 #if EV_CHECK_ENABLE
3763 /* queue check watchers, to be executed first */
3764 if (expect_false (checkcnt))
3765 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3766 #endif
3767
3768 EV_INVOKE_PENDING;
3769 }
3770 while (expect_true (
3771 activecnt
3772 && !loop_done
3773 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3774 ));
3775
3776 if (loop_done == EVBREAK_ONE)
3777 loop_done = EVBREAK_CANCEL;
3778
3779 #if EV_FEATURE_API
3780 --loop_depth;
3781 #endif
3782
3783 return activecnt;
3784 }
3785
3786 void
3787 ev_break (EV_P_ int how) EV_NOEXCEPT
3788 {
3789 loop_done = how;
3790 }
3791
3792 void
3793 ev_ref (EV_P) EV_NOEXCEPT
3794 {
3795 ++activecnt;
3796 }
3797
3798 void
3799 ev_unref (EV_P) EV_NOEXCEPT
3800 {
3801 --activecnt;
3802 }
3803
3804 void
3805 ev_now_update (EV_P) EV_NOEXCEPT
3806 {
3807 time_update (EV_A_ 1e100);
3808 }
3809
3810 void
3811 ev_suspend (EV_P) EV_NOEXCEPT
3812 {
3813 ev_now_update (EV_A);
3814 }
3815
3816 void
3817 ev_resume (EV_P) EV_NOEXCEPT
3818 {
3819 ev_tstamp mn_prev = mn_now;
3820
3821 ev_now_update (EV_A);
3822 timers_reschedule (EV_A_ mn_now - mn_prev);
3823 #if EV_PERIODIC_ENABLE
3824 /* TODO: really do this? */
3825 periodics_reschedule (EV_A);
3826 #endif
3827 }
3828
3829 /*****************************************************************************/
3830 /* singly-linked list management, used when the expected list length is short */
3831
3832 inline_size void
3833 wlist_add (WL *head, WL elem)
3834 {
3835 elem->next = *head;
3836 *head = elem;
3837 }
3838
3839 inline_size void
3840 wlist_del (WL *head, WL elem)
3841 {
3842 while (*head)
3843 {
3844 if (expect_true (*head == elem))
3845 {
3846 *head = elem->next;
3847 break;
3848 }
3849
3850 head = &(*head)->next;
3851 }
3852 }
3853
3854 /* internal, faster, version of ev_clear_pending */
3855 inline_speed void
3856 clear_pending (EV_P_ W w)
3857 {
3858 if (w->pending)
3859 {
3860 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3861 w->pending = 0;
3862 }
3863 }
3864
3865 int
3866 ev_clear_pending (EV_P_ void *w) EV_NOEXCEPT
3867 {
3868 W w_ = (W)w;
3869 int pending = w_->pending;
3870
3871 if (expect_true (pending))
3872 {
3873 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3874 p->w = (W)&pending_w;
3875 w_->pending = 0;
3876 return p->events;
3877 }
3878 else
3879 return 0;
3880 }
3881
3882 inline_size void
3883 pri_adjust (EV_P_ W w)
3884 {
3885 int pri = ev_priority (w);
3886 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3887 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3888 ev_set_priority (w, pri);
3889 }
3890
3891 inline_speed void
3892 ev_start (EV_P_ W w, int active)
3893 {
3894 pri_adjust (EV_A_ w);
3895 w->active = active;
3896 ev_ref (EV_A);
3897 }
3898
3899 inline_size void
3900 ev_stop (EV_P_ W w)
3901 {
3902 ev_unref (EV_A);
3903 w->active = 0;
3904 }
3905
3906 /*****************************************************************************/
3907
3908 noinline
3909 void
3910 ev_io_start (EV_P_ ev_io *w) EV_NOEXCEPT
3911 {
3912 int fd = w->fd;
3913
3914 if (expect_false (ev_is_active (w)))
3915 return;
3916
3917 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3918 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3919
3920 EV_FREQUENT_CHECK;
3921
3922 ev_start (EV_A_ (W)w, 1);
3923 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_needsize_zerofill);
3924 wlist_add (&anfds[fd].head, (WL)w);
3925
3926 /* common bug, apparently */
3927 assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
3928
3929 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3930 w->events &= ~EV__IOFDSET;
3931
3932 EV_FREQUENT_CHECK;
3933 }
3934
3935 noinline
3936 void
3937 ev_io_stop (EV_P_ ev_io *w) EV_NOEXCEPT
3938 {
3939 clear_pending (EV_A_ (W)w);
3940 if (expect_false (!ev_is_active (w)))
3941 return;
3942
3943 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3944
3945 EV_FREQUENT_CHECK;
3946
3947 wlist_del (&anfds[w->fd].head, (WL)w);
3948 ev_stop (EV_A_ (W)w);
3949
3950 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3951
3952 EV_FREQUENT_CHECK;
3953 }
3954
3955 noinline
3956 void
3957 ev_timer_start (EV_P_ ev_timer *w) EV_NOEXCEPT
3958 {
3959 if (expect_false (ev_is_active (w)))
3960 return;
3961
3962 ev_at (w) += mn_now;
3963
3964 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3965
3966 EV_FREQUENT_CHECK;
3967
3968 ++timercnt;
3969 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3970 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, array_needsize_noinit);
3971 ANHE_w (timers [ev_active (w)]) = (WT)w;
3972 ANHE_at_cache (timers [ev_active (w)]);
3973 upheap (timers, ev_active (w));
3974
3975 EV_FREQUENT_CHECK;
3976
3977 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3978 }
3979
3980 noinline
3981 void
3982 ev_timer_stop (EV_P_ ev_timer *w) EV_NOEXCEPT
3983 {
3984 clear_pending (EV_A_ (W)w);
3985 if (expect_false (!ev_is_active (w)))
3986 return;
3987
3988 EV_FREQUENT_CHECK;
3989
3990 {
3991 int active = ev_active (w);
3992
3993 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3994
3995 --timercnt;
3996
3997 if (expect_true (active < timercnt + HEAP0))
3998 {
3999 timers [active] = timers [timercnt + HEAP0];
4000 adjustheap (timers, timercnt, active);
4001 }
4002 }
4003
4004 ev_at (w) -= mn_now;
4005
4006 ev_stop (EV_A_ (W)w);
4007
4008 EV_FREQUENT_CHECK;
4009 }
4010
4011 noinline
4012 void
4013 ev_timer_again (EV_P_ ev_timer *w) EV_NOEXCEPT
4014 {
4015 EV_FREQUENT_CHECK;
4016
4017 clear_pending (EV_A_ (W)w);
4018
4019 if (ev_is_active (w))
4020 {
4021 if (w->repeat)
4022 {
4023 ev_at (w) = mn_now + w->repeat;
4024 ANHE_at_cache (timers [ev_active (w)]);
4025 adjustheap (timers, timercnt, ev_active (w));
4026 }
4027 else
4028 ev_timer_stop (EV_A_ w);
4029 }
4030 else if (w->repeat)
4031 {
4032 ev_at (w) = w->repeat;
4033 ev_timer_start (EV_A_ w);
4034 }
4035
4036 EV_FREQUENT_CHECK;
4037 }
4038
4039 ev_tstamp
4040 ev_timer_remaining (EV_P_ ev_timer *w) EV_NOEXCEPT
4041 {
4042 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
4043 }
4044
4045 #if EV_PERIODIC_ENABLE
4046 noinline
4047 void
4048 ev_periodic_start (EV_P_ ev_periodic *w) EV_NOEXCEPT
4049 {
4050 if (expect_false (ev_is_active (w)))
4051 return;
4052
4053 if (w->reschedule_cb)
4054 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
4055 else if (w->interval)
4056 {
4057 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
4058 periodic_recalc (EV_A_ w);
4059 }
4060 else
4061 ev_at (w) = w->offset;
4062
4063 EV_FREQUENT_CHECK;
4064
4065 ++periodiccnt;
4066 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
4067 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, array_needsize_noinit);
4068 ANHE_w (periodics [ev_active (w)]) = (WT)w;
4069 ANHE_at_cache (periodics [ev_active (w)]);
4070 upheap (periodics, ev_active (w));
4071
4072 EV_FREQUENT_CHECK;
4073
4074 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
4075 }
4076
4077 noinline
4078 void
4079 ev_periodic_stop (EV_P_ ev_periodic *w) EV_NOEXCEPT
4080 {
4081 clear_pending (EV_A_ (W)w);
4082 if (expect_false (!ev_is_active (w)))
4083 return;
4084
4085 EV_FREQUENT_CHECK;
4086
4087 {
4088 int active = ev_active (w);
4089
4090 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
4091
4092 --periodiccnt;
4093
4094 if (expect_true (active < periodiccnt + HEAP0))
4095 {
4096 periodics [active] = periodics [periodiccnt + HEAP0];
4097 adjustheap (periodics, periodiccnt, active);
4098 }
4099 }
4100
4101 ev_stop (EV_A_ (W)w);
4102
4103 EV_FREQUENT_CHECK;
4104 }
4105
4106 noinline
4107 void
4108 ev_periodic_again (EV_P_ ev_periodic *w) EV_NOEXCEPT
4109 {
4110 /* TODO: use adjustheap and recalculation */
4111 ev_periodic_stop (EV_A_ w);
4112 ev_periodic_start (EV_A_ w);
4113 }
4114 #endif
4115
4116 #ifndef SA_RESTART
4117 # define SA_RESTART 0
4118 #endif
4119
4120 #if EV_SIGNAL_ENABLE
4121
4122 noinline
4123 void
4124 ev_signal_start (EV_P_ ev_signal *w) EV_NOEXCEPT
4125 {
4126 if (expect_false (ev_is_active (w)))
4127 return;
4128
4129 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
4130
4131 #if EV_MULTIPLICITY
4132 assert (("libev: a signal must not be attached to two different loops",
4133 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
4134
4135 signals [w->signum - 1].loop = EV_A;
4136 ECB_MEMORY_FENCE_RELEASE;
4137 #endif
4138
4139 EV_FREQUENT_CHECK;
4140
4141 #if EV_USE_SIGNALFD
4142 if (sigfd == -2)
4143 {
4144 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
4145 if (sigfd < 0 && errno == EINVAL)
4146 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
4147
4148 if (sigfd >= 0)
4149 {
4150 fd_intern (sigfd); /* doing it twice will not hurt */
4151
4152 sigemptyset (&sigfd_set);
4153
4154 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
4155 ev_set_priority (&sigfd_w, EV_MAXPRI);
4156 ev_io_start (EV_A_ &sigfd_w);
4157 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
4158 }
4159 }
4160
4161 if (sigfd >= 0)
4162 {
4163 /* TODO: check .head */
4164 sigaddset (&sigfd_set, w->signum);
4165 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
4166
4167 signalfd (sigfd, &sigfd_set, 0);
4168 }
4169 #endif
4170
4171 ev_start (EV_A_ (W)w, 1);
4172 wlist_add (&signals [w->signum - 1].head, (WL)w);
4173
4174 if (!((WL)w)->next)
4175 # if EV_USE_SIGNALFD
4176 if (sigfd < 0) /*TODO*/
4177 # endif
4178 {
4179 # ifdef _WIN32
4180 evpipe_init (EV_A);
4181
4182 signal (w->signum, ev_sighandler);
4183 # else
4184 struct sigaction sa;
4185
4186 evpipe_init (EV_A);
4187
4188 sa.sa_handler = ev_sighandler;
4189 sigfillset (&sa.sa_mask);
4190 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
4191 sigaction (w->signum, &sa, 0);
4192
4193 if (origflags & EVFLAG_NOSIGMASK)
4194 {
4195 sigemptyset (&sa.sa_mask);
4196 sigaddset (&sa.sa_mask, w->signum);
4197 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
4198 }
4199 #endif
4200 }
4201
4202 EV_FREQUENT_CHECK;
4203 }
4204
4205 noinline
4206 void
4207 ev_signal_stop (EV_P_ ev_signal *w) EV_NOEXCEPT
4208 {
4209 clear_pending (EV_A_ (W)w);
4210 if (expect_false (!ev_is_active (w)))
4211 return;
4212
4213 EV_FREQUENT_CHECK;
4214
4215 wlist_del (&signals [w->signum - 1].head, (WL)w);
4216 ev_stop (EV_A_ (W)w);
4217
4218 if (!signals [w->signum - 1].head)
4219 {
4220 #if EV_MULTIPLICITY
4221 signals [w->signum - 1].loop = 0; /* unattach from signal */
4222 #endif
4223 #if EV_USE_SIGNALFD
4224 if (sigfd >= 0)
4225 {
4226 sigset_t ss;
4227
4228 sigemptyset (&ss);
4229 sigaddset (&ss, w->signum);
4230 sigdelset (&sigfd_set, w->signum);
4231
4232 signalfd (sigfd, &sigfd_set, 0);
4233 sigprocmask (SIG_UNBLOCK, &ss, 0);
4234 }
4235 else
4236 #endif
4237 signal (w->signum, SIG_DFL);
4238 }
4239
4240 EV_FREQUENT_CHECK;
4241 }
4242
4243 #endif
4244
4245 #if EV_CHILD_ENABLE
4246
4247 void
4248 ev_child_start (EV_P_ ev_child *w) EV_NOEXCEPT
4249 {
4250 #if EV_MULTIPLICITY
4251 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
4252 #endif
4253 if (expect_false (ev_is_active (w)))
4254 return;
4255
4256 EV_FREQUENT_CHECK;
4257
4258 ev_start (EV_A_ (W)w, 1);
4259 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
4260
4261 EV_FREQUENT_CHECK;
4262 }
4263
4264 void
4265 ev_child_stop (EV_P_ ev_child *w) EV_NOEXCEPT
4266 {
4267 clear_pending (EV_A_ (W)w);
4268 if (expect_false (!ev_is_active (w)))
4269 return;
4270
4271 EV_FREQUENT_CHECK;
4272
4273 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
4274 ev_stop (EV_A_ (W)w);
4275
4276 EV_FREQUENT_CHECK;
4277 }
4278
4279 #endif
4280
4281 #if EV_STAT_ENABLE
4282
4283 # ifdef _WIN32
4284 # undef lstat
4285 # define lstat(a,b) _stati64 (a,b)
4286 # endif
4287
4288 #define DEF_STAT_INTERVAL 5.0074891
4289 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
4290 #define MIN_STAT_INTERVAL 0.1074891
4291
4292 noinline static void stat_timer_cb (EV_P_ ev_timer *w_, int revents);
4293
4294 #if EV_USE_INOTIFY
4295
4296 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
4297 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
4298
4299 noinline
4300 static void
4301 infy_add (EV_P_ ev_stat *w)
4302 {
4303 w->wd = inotify_add_watch (fs_fd, w->path,
4304 IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY
4305 | IN_CREATE | IN_DELETE | IN_MOVED_FROM | IN_MOVED_TO
4306 | IN_DONT_FOLLOW | IN_MASK_ADD);
4307
4308 if (w->wd >= 0)
4309 {
4310 struct statfs sfs;
4311
4312 /* now local changes will be tracked by inotify, but remote changes won't */
4313 /* unless the filesystem is known to be local, we therefore still poll */
4314 /* also do poll on <2.6.25, but with normal frequency */
4315
4316 if (!fs_2625)
4317 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
4318 else if (!statfs (w->path, &sfs)
4319 && (sfs.f_type == 0x1373 /* devfs */
4320 || sfs.f_type == 0x4006 /* fat */
4321 || sfs.f_type == 0x4d44 /* msdos */
4322 || sfs.f_type == 0xEF53 /* ext2/3 */
4323 || sfs.f_type == 0x72b6 /* jffs2 */
4324 || sfs.f_type == 0x858458f6 /* ramfs */
4325 || sfs.f_type == 0x5346544e /* ntfs */
4326 || sfs.f_type == 0x3153464a /* jfs */
4327 || sfs.f_type == 0x9123683e /* btrfs */
4328 || sfs.f_type == 0x52654973 /* reiser3 */
4329 || sfs.f_type == 0x01021994 /* tmpfs */
4330 || sfs.f_type == 0x58465342 /* xfs */))
4331 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
4332 else
4333 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
4334 }
4335 else
4336 {
4337 /* can't use inotify, continue to stat */
4338 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
4339
4340 /* if path is not there, monitor some parent directory for speedup hints */
4341 /* note that exceeding the hardcoded path limit is not a correctness issue, */
4342 /* but an efficiency issue only */
4343 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
4344 {
4345 char path [4096];
4346 strcpy (path, w->path);
4347
4348 do
4349 {
4350 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
4351 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
4352
4353 char *pend = strrchr (path, '/');
4354
4355 if (!pend || pend == path)
4356 break;
4357
4358 *pend = 0;
4359 w->wd = inotify_add_watch (fs_fd, path, mask);
4360 }
4361 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
4362 }
4363 }
4364
4365 if (w->wd >= 0)
4366 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
4367
4368 /* now re-arm timer, if required */
4369 if (ev_is_active (&w->timer)) ev_ref (EV_A);
4370 ev_timer_again (EV_A_ &w->timer);
4371 if (ev_is_active (&w->timer)) ev_unref (EV_A);
4372 }
4373
4374 noinline
4375 static void
4376 infy_del (EV_P_ ev_stat *w)
4377 {
4378 int slot;
4379 int wd = w->wd;
4380
4381 if (wd < 0)
4382 return;
4383
4384 w->wd = -2;
4385 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
4386 wlist_del (&fs_hash [slot].head, (WL)w);
4387
4388 /* remove this watcher, if others are watching it, they will rearm */
4389 inotify_rm_watch (fs_fd, wd);
4390 }
4391
4392 noinline
4393 static void
4394 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
4395 {
4396 if (slot < 0)
4397 /* overflow, need to check for all hash slots */
4398 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
4399 infy_wd (EV_A_ slot, wd, ev);
4400 else
4401 {
4402 WL w_;
4403
4404 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
4405 {
4406 ev_stat *w = (ev_stat *)w_;
4407 w_ = w_->next; /* lets us remove this watcher and all before it */
4408
4409 if (w->wd == wd || wd == -1)
4410 {
4411 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
4412 {
4413 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
4414 w->wd = -1;
4415 infy_add (EV_A_ w); /* re-add, no matter what */
4416 }
4417
4418 stat_timer_cb (EV_A_ &w->timer, 0);
4419 }
4420 }
4421 }
4422 }
4423
4424 static void
4425 infy_cb (EV_P_ ev_io *w, int revents)
4426 {
4427 char buf [EV_INOTIFY_BUFSIZE];
4428 int ofs;
4429 int len = read (fs_fd, buf, sizeof (buf));
4430
4431 for (ofs = 0; ofs < len; )
4432 {
4433 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
4434 infy_wd (EV_A_ ev->wd, ev->wd, ev);
4435 ofs += sizeof (struct inotify_event) + ev->len;
4436 }
4437 }
4438
4439 inline_size ecb_cold
4440 void
4441 ev_check_2625 (EV_P)
4442 {
4443 /* kernels < 2.6.25 are borked
4444 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
4445 */
4446 if (ev_linux_version () < 0x020619)
4447 return;
4448
4449 fs_2625 = 1;
4450 }
4451
4452 inline_size int
4453 infy_newfd (void)
4454 {
4455 #if defined IN_CLOEXEC && defined IN_NONBLOCK
4456 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
4457 if (fd >= 0)
4458 return fd;
4459 #endif
4460 return inotify_init ();
4461 }
4462
4463 inline_size void
4464 infy_init (EV_P)
4465 {
4466 if (fs_fd != -2)
4467 return;
4468
4469 fs_fd = -1;
4470
4471 ev_check_2625 (EV_A);
4472
4473 fs_fd = infy_newfd ();
4474
4475 if (fs_fd >= 0)
4476 {
4477 fd_intern (fs_fd);
4478 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
4479 ev_set_priority (&fs_w, EV_MAXPRI);
4480 ev_io_start (EV_A_ &fs_w);
4481 ev_unref (EV_A);
4482 }
4483 }
4484
4485 inline_size void
4486 infy_fork (EV_P)
4487 {
4488 int slot;
4489
4490 if (fs_fd < 0)
4491 return;
4492
4493 ev_ref (EV_A);
4494 ev_io_stop (EV_A_ &fs_w);
4495 close (fs_fd);
4496 fs_fd = infy_newfd ();
4497
4498 if (fs_fd >= 0)
4499 {
4500 fd_intern (fs_fd);
4501 ev_io_set (&fs_w, fs_fd, EV_READ);
4502 ev_io_start (EV_A_ &fs_w);
4503 ev_unref (EV_A);
4504 }
4505
4506 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
4507 {
4508 WL w_ = fs_hash [slot].head;
4509 fs_hash [slot].head = 0;
4510
4511 while (w_)
4512 {
4513 ev_stat *w = (ev_stat *)w_;
4514 w_ = w_->next; /* lets us add this watcher */
4515
4516 w->wd = -1;
4517
4518 if (fs_fd >= 0)
4519 infy_add (EV_A_ w); /* re-add, no matter what */
4520 else
4521 {
4522 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
4523 if (ev_is_active (&w->timer)) ev_ref (EV_A);
4524 ev_timer_again (EV_A_ &w->timer);
4525 if (ev_is_active (&w->timer)) ev_unref (EV_A);
4526 }
4527 }
4528 }
4529 }
4530
4531 #endif
4532
4533 #ifdef _WIN32
4534 # define EV_LSTAT(p,b) _stati64 (p, b)
4535 #else
4536 # define EV_LSTAT(p,b) lstat (p, b)
4537 #endif
4538
4539 void
4540 ev_stat_stat (EV_P_ ev_stat *w) EV_NOEXCEPT
4541 {
4542 if (lstat (w->path, &w->attr) < 0)
4543 w->attr.st_nlink = 0;
4544 else if (!w->attr.st_nlink)
4545 w->attr.st_nlink = 1;
4546 }
4547
4548 noinline
4549 static void
4550 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
4551 {
4552 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
4553
4554 ev_statdata prev = w->attr;
4555 ev_stat_stat (EV_A_ w);
4556
4557 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
4558 if (
4559 prev.st_dev != w->attr.st_dev
4560 || prev.st_ino != w->attr.st_ino
4561 || prev.st_mode != w->attr.st_mode
4562 || prev.st_nlink != w->attr.st_nlink
4563 || prev.st_uid != w->attr.st_uid
4564 || prev.st_gid != w->attr.st_gid
4565 || prev.st_rdev != w->attr.st_rdev
4566 || prev.st_size != w->attr.st_size
4567 || prev.st_atime != w->attr.st_atime
4568 || prev.st_mtime != w->attr.st_mtime
4569 || prev.st_ctime != w->attr.st_ctime
4570 ) {
4571 /* we only update w->prev on actual differences */
4572 /* in case we test more often than invoke the callback, */
4573 /* to ensure that prev is always different to attr */
4574 w->prev = prev;
4575
4576 #if EV_USE_INOTIFY
4577 if (fs_fd >= 0)
4578 {
4579 infy_del (EV_A_ w);
4580 infy_add (EV_A_ w);
4581 ev_stat_stat (EV_A_ w); /* avoid race... */
4582 }
4583 #endif
4584
4585 ev_feed_event (EV_A_ w, EV_STAT);
4586 }
4587 }
4588
4589 void
4590 ev_stat_start (EV_P_ ev_stat *w) EV_NOEXCEPT
4591 {
4592 if (expect_false (ev_is_active (w)))
4593 return;
4594
4595 ev_stat_stat (EV_A_ w);
4596
4597 if (w->interval < MIN_STAT_INTERVAL && w->interval)
4598 w->interval = MIN_STAT_INTERVAL;
4599
4600 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
4601 ev_set_priority (&w->timer, ev_priority (w));
4602
4603 #if EV_USE_INOTIFY
4604 infy_init (EV_A);
4605
4606 if (fs_fd >= 0)
4607 infy_add (EV_A_ w);
4608 else
4609 #endif
4610 {
4611 ev_timer_again (EV_A_ &w->timer);
4612 ev_unref (EV_A);
4613 }
4614
4615 ev_start (EV_A_ (W)w, 1);
4616
4617 EV_FREQUENT_CHECK;
4618 }
4619
4620 void
4621 ev_stat_stop (EV_P_ ev_stat *w) EV_NOEXCEPT
4622 {
4623 clear_pending (EV_A_ (W)w);
4624 if (expect_false (!ev_is_active (w)))
4625 return;
4626
4627 EV_FREQUENT_CHECK;
4628
4629 #if EV_USE_INOTIFY
4630 infy_del (EV_A_ w);
4631 #endif
4632
4633 if (ev_is_active (&w->timer))
4634 {
4635 ev_ref (EV_A);
4636 ev_timer_stop (EV_A_ &w->timer);
4637 }
4638
4639 ev_stop (EV_A_ (W)w);
4640
4641 EV_FREQUENT_CHECK;
4642 }
4643 #endif
4644
4645 #if EV_IDLE_ENABLE
4646 void
4647 ev_idle_start (EV_P_ ev_idle *w) EV_NOEXCEPT
4648 {
4649 if (expect_false (ev_is_active (w)))
4650 return;
4651
4652 pri_adjust (EV_A_ (W)w);
4653
4654 EV_FREQUENT_CHECK;
4655
4656 {
4657 int active = ++idlecnt [ABSPRI (w)];
4658
4659 ++idleall;
4660 ev_start (EV_A_ (W)w, active);
4661
4662 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, array_needsize_noinit);
4663 idles [ABSPRI (w)][active - 1] = w;
4664 }
4665
4666 EV_FREQUENT_CHECK;
4667 }
4668
4669 void
4670 ev_idle_stop (EV_P_ ev_idle *w) EV_NOEXCEPT
4671 {
4672 clear_pending (EV_A_ (W)w);
4673 if (expect_false (!ev_is_active (w)))
4674 return;
4675
4676 EV_FREQUENT_CHECK;
4677
4678 {
4679 int active = ev_active (w);
4680
4681 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
4682 ev_active (idles [ABSPRI (w)][active - 1]) = active;
4683
4684 ev_stop (EV_A_ (W)w);
4685 --idleall;
4686 }
4687
4688 EV_FREQUENT_CHECK;
4689 }
4690 #endif
4691
4692 #if EV_PREPARE_ENABLE
4693 void
4694 ev_prepare_start (EV_P_ ev_prepare *w) EV_NOEXCEPT
4695 {
4696 if (expect_false (ev_is_active (w)))
4697 return;
4698
4699 EV_FREQUENT_CHECK;
4700
4701 ev_start (EV_A_ (W)w, ++preparecnt);
4702 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, array_needsize_noinit);
4703 prepares [preparecnt - 1] = w;
4704
4705 EV_FREQUENT_CHECK;
4706 }
4707
4708 void
4709 ev_prepare_stop (EV_P_ ev_prepare *w) EV_NOEXCEPT
4710 {
4711 clear_pending (EV_A_ (W)w);
4712 if (expect_false (!ev_is_active (w)))
4713 return;
4714
4715 EV_FREQUENT_CHECK;
4716
4717 {
4718 int active = ev_active (w);
4719
4720 prepares [active - 1] = prepares [--preparecnt];
4721 ev_active (prepares [active - 1]) = active;
4722 }
4723
4724 ev_stop (EV_A_ (W)w);
4725
4726 EV_FREQUENT_CHECK;
4727 }
4728 #endif
4729
4730 #if EV_CHECK_ENABLE
4731 void
4732 ev_check_start (EV_P_ ev_check *w) EV_NOEXCEPT
4733 {
4734 if (expect_false (ev_is_active (w)))
4735 return;
4736
4737 EV_FREQUENT_CHECK;
4738
4739 ev_start (EV_A_ (W)w, ++checkcnt);
4740 array_needsize (ev_check *, checks, checkmax, checkcnt, array_needsize_noinit);
4741 checks [checkcnt - 1] = w;
4742
4743 EV_FREQUENT_CHECK;
4744 }
4745
4746 void
4747 ev_check_stop (EV_P_ ev_check *w) EV_NOEXCEPT
4748 {
4749 clear_pending (EV_A_ (W)w);
4750 if (expect_false (!ev_is_active (w)))
4751 return;
4752
4753 EV_FREQUENT_CHECK;
4754
4755 {
4756 int active = ev_active (w);
4757
4758 checks [active - 1] = checks [--checkcnt];
4759 ev_active (checks [active - 1]) = active;
4760 }
4761
4762 ev_stop (EV_A_ (W)w);
4763
4764 EV_FREQUENT_CHECK;
4765 }
4766 #endif
4767
4768 #if EV_EMBED_ENABLE
4769 noinline
4770 void
4771 ev_embed_sweep (EV_P_ ev_embed *w) EV_NOEXCEPT
4772 {
4773 ev_run (w->other, EVRUN_NOWAIT);
4774 }
4775
4776 static void
4777 embed_io_cb (EV_P_ ev_io *io, int revents)
4778 {
4779 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4780
4781 if (ev_cb (w))
4782 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4783 else
4784 ev_run (w->other, EVRUN_NOWAIT);
4785 }
4786
4787 static void
4788 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4789 {
4790 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4791
4792 {
4793 EV_P = w->other;
4794
4795 while (fdchangecnt)
4796 {
4797 fd_reify (EV_A);
4798 ev_run (EV_A_ EVRUN_NOWAIT);
4799 }
4800 }
4801 }
4802
4803 static void
4804 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4805 {
4806 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4807
4808 ev_embed_stop (EV_A_ w);
4809
4810 {
4811 EV_P = w->other;
4812
4813 ev_loop_fork (EV_A);
4814 ev_run (EV_A_ EVRUN_NOWAIT);
4815 }
4816
4817 ev_embed_start (EV_A_ w);
4818 }
4819
4820 #if 0
4821 static void
4822 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4823 {
4824 ev_idle_stop (EV_A_ idle);
4825 }
4826 #endif
4827
4828 void
4829 ev_embed_start (EV_P_ ev_embed *w) EV_NOEXCEPT
4830 {
4831 if (expect_false (ev_is_active (w)))
4832 return;
4833
4834 {
4835 EV_P = w->other;
4836 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4837 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4838 }
4839
4840 EV_FREQUENT_CHECK;
4841
4842 ev_set_priority (&w->io, ev_priority (w));
4843 ev_io_start (EV_A_ &w->io);
4844
4845 ev_prepare_init (&w->prepare, embed_prepare_cb);
4846 ev_set_priority (&w->prepare, EV_MINPRI);
4847 ev_prepare_start (EV_A_ &w->prepare);
4848
4849 ev_fork_init (&w->fork, embed_fork_cb);
4850 ev_fork_start (EV_A_ &w->fork);
4851
4852 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4853
4854 ev_start (EV_A_ (W)w, 1);
4855
4856 EV_FREQUENT_CHECK;
4857 }
4858
4859 void
4860 ev_embed_stop (EV_P_ ev_embed *w) EV_NOEXCEPT
4861 {
4862 clear_pending (EV_A_ (W)w);
4863 if (expect_false (!ev_is_active (w)))
4864 return;
4865
4866 EV_FREQUENT_CHECK;
4867
4868 ev_io_stop (EV_A_ &w->io);
4869 ev_prepare_stop (EV_A_ &w->prepare);
4870 ev_fork_stop (EV_A_ &w->fork);
4871
4872 ev_stop (EV_A_ (W)w);
4873
4874 EV_FREQUENT_CHECK;
4875 }
4876 #endif
4877
4878 #if EV_FORK_ENABLE
4879 void
4880 ev_fork_start (EV_P_ ev_fork *w) EV_NOEXCEPT
4881 {
4882 if (expect_false (ev_is_active (w)))
4883 return;
4884
4885 EV_FREQUENT_CHECK;
4886
4887 ev_start (EV_A_ (W)w, ++forkcnt);
4888 array_needsize (ev_fork *, forks, forkmax, forkcnt, array_needsize_noinit);
4889 forks [forkcnt - 1] = w;
4890
4891 EV_FREQUENT_CHECK;
4892 }
4893
4894 void
4895 ev_fork_stop (EV_P_ ev_fork *w) EV_NOEXCEPT
4896 {
4897 clear_pending (EV_A_ (W)w);
4898 if (expect_false (!ev_is_active (w)))
4899 return;
4900
4901 EV_FREQUENT_CHECK;
4902
4903 {
4904 int active = ev_active (w);
4905
4906 forks [active - 1] = forks [--forkcnt];
4907 ev_active (forks [active - 1]) = active;
4908 }
4909
4910 ev_stop (EV_A_ (W)w);
4911
4912 EV_FREQUENT_CHECK;
4913 }
4914 #endif
4915
4916 #if EV_CLEANUP_ENABLE
4917 void
4918 ev_cleanup_start (EV_P_ ev_cleanup *w) EV_NOEXCEPT
4919 {
4920 if (expect_false (ev_is_active (w)))
4921 return;
4922
4923 EV_FREQUENT_CHECK;
4924
4925 ev_start (EV_A_ (W)w, ++cleanupcnt);
4926 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, array_needsize_noinit);
4927 cleanups [cleanupcnt - 1] = w;
4928
4929 /* cleanup watchers should never keep a refcount on the loop */
4930 ev_unref (EV_A);
4931 EV_FREQUENT_CHECK;
4932 }
4933
4934 void
4935 ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_NOEXCEPT
4936 {
4937 clear_pending (EV_A_ (W)w);
4938 if (expect_false (!ev_is_active (w)))
4939 return;
4940
4941 EV_FREQUENT_CHECK;
4942 ev_ref (EV_A);
4943
4944 {
4945 int active = ev_active (w);
4946
4947 cleanups [active - 1] = cleanups [--cleanupcnt];
4948 ev_active (cleanups [active - 1]) = active;
4949 }
4950
4951 ev_stop (EV_A_ (W)w);
4952
4953 EV_FREQUENT_CHECK;
4954 }
4955 #endif
4956
4957 #if EV_ASYNC_ENABLE
4958 void
4959 ev_async_start (EV_P_ ev_async *w) EV_NOEXCEPT
4960 {
4961 if (expect_false (ev_is_active (w)))
4962 return;
4963
4964 w->sent = 0;
4965
4966 evpipe_init (EV_A);
4967
4968 EV_FREQUENT_CHECK;
4969
4970 ev_start (EV_A_ (W)w, ++asynccnt);
4971 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, array_needsize_noinit);
4972 asyncs [asynccnt - 1] = w;
4973
4974 EV_FREQUENT_CHECK;
4975 }
4976
4977 void
4978 ev_async_stop (EV_P_ ev_async *w) EV_NOEXCEPT
4979 {
4980 clear_pending (EV_A_ (W)w);
4981 if (expect_false (!ev_is_active (w)))
4982 return;
4983
4984 EV_FREQUENT_CHECK;
4985
4986 {
4987 int active = ev_active (w);
4988
4989 asyncs [active - 1] = asyncs [--asynccnt];
4990 ev_active (asyncs [active - 1]) = active;
4991 }
4992
4993 ev_stop (EV_A_ (W)w);
4994
4995 EV_FREQUENT_CHECK;
4996 }
4997
4998 void
4999 ev_async_send (EV_P_ ev_async *w) EV_NOEXCEPT
5000 {
5001 w->sent = 1;
5002 evpipe_write (EV_A_ &async_pending);
5003 }
5004 #endif
5005
5006 /*****************************************************************************/
5007
5008 struct ev_once
5009 {
5010 ev_io io;
5011 ev_timer to;
5012 void (*cb)(int revents, void *arg);
5013 void *arg;
5014 };
5015
5016 static void
5017 once_cb (EV_P_ struct ev_once *once, int revents)
5018 {
5019 void (*cb)(int revents, void *arg) = once->cb;
5020 void *arg = once->arg;
5021
5022 ev_io_stop (EV_A_ &once->io);
5023 ev_timer_stop (EV_A_ &once->to);
5024 ev_free (once);
5025
5026 cb (revents, arg);
5027 }
5028
5029 static void
5030 once_cb_io (EV_P_ ev_io *w, int revents)
5031 {
5032 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
5033
5034 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
5035 }
5036
5037 static void
5038 once_cb_to (EV_P_ ev_timer *w, int revents)
5039 {
5040 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
5041
5042 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
5043 }
5044
5045 void
5046 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_NOEXCEPT
5047 {
5048 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
5049
5050 once->cb = cb;
5051 once->arg = arg;
5052
5053 ev_init (&once->io, once_cb_io);
5054 if (fd >= 0)
5055 {
5056 ev_io_set (&once->io, fd, events);
5057 ev_io_start (EV_A_ &once->io);
5058 }
5059
5060 ev_init (&once->to, once_cb_to);
5061 if (timeout >= 0.)
5062 {
5063 ev_timer_set (&once->to, timeout, 0.);
5064 ev_timer_start (EV_A_ &once->to);
5065 }
5066 }
5067
5068 /*****************************************************************************/
5069
5070 #if EV_WALK_ENABLE
5071 ecb_cold
5072 void
5073 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_NOEXCEPT
5074 {
5075 int i, j;
5076 ev_watcher_list *wl, *wn;
5077
5078 if (types & (EV_IO | EV_EMBED))
5079 for (i = 0; i < anfdmax; ++i)
5080 for (wl = anfds [i].head; wl; )
5081 {
5082 wn = wl->next;
5083
5084 #if EV_EMBED_ENABLE
5085 if (ev_cb ((ev_io *)wl) == embed_io_cb)
5086 {
5087 if (types & EV_EMBED)
5088 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
5089 }
5090 else
5091 #endif
5092 #if EV_USE_INOTIFY
5093 if (ev_cb ((ev_io *)wl) == infy_cb)
5094 ;
5095 else
5096 #endif
5097 if ((ev_io *)wl != &pipe_w)
5098 if (types & EV_IO)
5099 cb (EV_A_ EV_IO, wl);
5100
5101 wl = wn;
5102 }
5103
5104 if (types & (EV_TIMER | EV_STAT))
5105 for (i = timercnt + HEAP0; i-- > HEAP0; )
5106 #if EV_STAT_ENABLE
5107 /*TODO: timer is not always active*/
5108 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
5109 {
5110 if (types & EV_STAT)
5111 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
5112 }
5113 else
5114 #endif
5115 if (types & EV_TIMER)
5116 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
5117
5118 #if EV_PERIODIC_ENABLE
5119 if (types & EV_PERIODIC)
5120 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
5121 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
5122 #endif
5123
5124 #if EV_IDLE_ENABLE
5125 if (types & EV_IDLE)
5126 for (j = NUMPRI; j--; )
5127 for (i = idlecnt [j]; i--; )
5128 cb (EV_A_ EV_IDLE, idles [j][i]);
5129 #endif
5130
5131 #if EV_FORK_ENABLE
5132 if (types & EV_FORK)
5133 for (i = forkcnt; i--; )
5134 if (ev_cb (forks [i]) != embed_fork_cb)
5135 cb (EV_A_ EV_FORK, forks [i]);
5136 #endif
5137
5138 #if EV_ASYNC_ENABLE
5139 if (types & EV_ASYNC)
5140 for (i = asynccnt; i--; )
5141 cb (EV_A_ EV_ASYNC, asyncs [i]);
5142 #endif
5143
5144 #if EV_PREPARE_ENABLE
5145 if (types & EV_PREPARE)
5146 for (i = preparecnt; i--; )
5147 # if EV_EMBED_ENABLE
5148 if (ev_cb (prepares [i]) != embed_prepare_cb)
5149 # endif
5150 cb (EV_A_ EV_PREPARE, prepares [i]);
5151 #endif
5152
5153 #if EV_CHECK_ENABLE
5154 if (types & EV_CHECK)
5155 for (i = checkcnt; i--; )
5156 cb (EV_A_ EV_CHECK, checks [i]);
5157 #endif
5158
5159 #if EV_SIGNAL_ENABLE
5160 if (types & EV_SIGNAL)
5161 for (i = 0; i < EV_NSIG - 1; ++i)
5162 for (wl = signals [i].head; wl; )
5163 {
5164 wn = wl->next;
5165 cb (EV_A_ EV_SIGNAL, wl);
5166 wl = wn;
5167 }
5168 #endif
5169
5170 #if EV_CHILD_ENABLE
5171 if (types & EV_CHILD)
5172 for (i = (EV_PID_HASHSIZE); i--; )
5173 for (wl = childs [i]; wl; )
5174 {
5175 wn = wl->next;
5176 cb (EV_A_ EV_CHILD, wl);
5177 wl = wn;
5178 }
5179 #endif
5180 /* EV_STAT 0x00001000 /* stat data changed */
5181 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
5182 }
5183 #endif
5184
5185 #if EV_MULTIPLICITY
5186 #include "ev_wrap.h"
5187 #endif
5188