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Comparing libev/ev.c (file contents):
Revision 1.41 by root, Fri Nov 2 16:54:34 2007 UTC vs.
Revision 1.382 by sf-exg, Thu Jun 30 13:13:59 2011 UTC

1/* 1/*
2 * libev event processing core, watcher management 2 * libev event processing core, watcher management
3 * 3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary forms, with or without 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * modification, are permitted provided that the following conditions are 8 * tion, are permitted provided that the following conditions are met:
9 * met:
10 * 9 *
11 * * Redistributions of source code must retain the above copyright 10 * 1. Redistributions of source code must retain the above copyright notice,
12 * notice, this list of conditions and the following disclaimer. 11 * this list of conditions and the following disclaimer.
13 * 12 *
14 * * Redistributions in binary form must reproduce the above 13 * 2. Redistributions in binary form must reproduce the above copyright
15 * copyright notice, this list of conditions and the following 14 * notice, this list of conditions and the following disclaimer in the
16 * disclaimer in the documentation and/or other materials provided 15 * documentation and/or other materials provided with the distribution.
17 * with the distribution.
18 * 16 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 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.
30 */ 38 */
39
40/* this big block deduces configuration from config.h */
41#ifndef EV_STANDALONE
31#if EV_USE_CONFIG_H 42# ifdef EV_CONFIG_H
43# include EV_CONFIG_H
44# else
32# include "config.h" 45# include "config.h"
33#endif 46# endif
34 47
35#include <math.h> 48#if HAVE_FLOOR
49# ifndef EV_USE_FLOOR
50# define EV_USE_FLOOR 1
51# endif
52#endif
53
54# if HAVE_CLOCK_SYSCALL
55# ifndef EV_USE_CLOCK_SYSCALL
56# define EV_USE_CLOCK_SYSCALL 1
57# ifndef EV_USE_REALTIME
58# define EV_USE_REALTIME 0
59# endif
60# ifndef EV_USE_MONOTONIC
61# define EV_USE_MONOTONIC 1
62# endif
63# endif
64# elif !defined(EV_USE_CLOCK_SYSCALL)
65# define EV_USE_CLOCK_SYSCALL 0
66# endif
67
68# if HAVE_CLOCK_GETTIME
69# ifndef EV_USE_MONOTONIC
70# define EV_USE_MONOTONIC 1
71# endif
72# ifndef EV_USE_REALTIME
73# define EV_USE_REALTIME 0
74# endif
75# else
76# ifndef EV_USE_MONOTONIC
77# define EV_USE_MONOTONIC 0
78# endif
79# ifndef EV_USE_REALTIME
80# define EV_USE_REALTIME 0
81# endif
82# endif
83
84# if HAVE_NANOSLEEP
85# ifndef EV_USE_NANOSLEEP
86# define EV_USE_NANOSLEEP EV_FEATURE_OS
87# endif
88# else
89# undef EV_USE_NANOSLEEP
90# define EV_USE_NANOSLEEP 0
91# endif
92
93# if HAVE_SELECT && HAVE_SYS_SELECT_H
94# ifndef EV_USE_SELECT
95# define EV_USE_SELECT EV_FEATURE_BACKENDS
96# endif
97# else
98# undef EV_USE_SELECT
99# define EV_USE_SELECT 0
100# endif
101
102# if HAVE_POLL && HAVE_POLL_H
103# ifndef EV_USE_POLL
104# define EV_USE_POLL EV_FEATURE_BACKENDS
105# endif
106# else
107# undef EV_USE_POLL
108# define EV_USE_POLL 0
109# endif
110
111# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
112# ifndef EV_USE_EPOLL
113# define EV_USE_EPOLL EV_FEATURE_BACKENDS
114# endif
115# else
116# undef EV_USE_EPOLL
117# define EV_USE_EPOLL 0
118# endif
119
120# if HAVE_KQUEUE && HAVE_SYS_EVENT_H
121# ifndef EV_USE_KQUEUE
122# define EV_USE_KQUEUE EV_FEATURE_BACKENDS
123# endif
124# else
125# undef EV_USE_KQUEUE
126# define EV_USE_KQUEUE 0
127# endif
128
129# if HAVE_PORT_H && HAVE_PORT_CREATE
130# ifndef EV_USE_PORT
131# define EV_USE_PORT EV_FEATURE_BACKENDS
132# endif
133# else
134# undef EV_USE_PORT
135# define EV_USE_PORT 0
136# endif
137
138# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
139# ifndef EV_USE_INOTIFY
140# define EV_USE_INOTIFY EV_FEATURE_OS
141# endif
142# else
143# undef EV_USE_INOTIFY
144# define EV_USE_INOTIFY 0
145# endif
146
147# if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
148# ifndef EV_USE_SIGNALFD
149# define EV_USE_SIGNALFD EV_FEATURE_OS
150# endif
151# else
152# undef EV_USE_SIGNALFD
153# define EV_USE_SIGNALFD 0
154# endif
155
156# if HAVE_EVENTFD
157# ifndef EV_USE_EVENTFD
158# define EV_USE_EVENTFD EV_FEATURE_OS
159# endif
160# else
161# undef EV_USE_EVENTFD
162# define EV_USE_EVENTFD 0
163# endif
164
165#endif
166
36#include <stdlib.h> 167#include <stdlib.h>
37#include <unistd.h> 168#include <string.h>
38#include <fcntl.h> 169#include <fcntl.h>
39#include <signal.h>
40#include <stddef.h> 170#include <stddef.h>
41 171
42#include <stdio.h> 172#include <stdio.h>
43 173
44#include <assert.h> 174#include <assert.h>
45#include <errno.h> 175#include <errno.h>
46#include <sys/types.h> 176#include <sys/types.h>
47#include <sys/wait.h>
48#include <sys/time.h>
49#include <time.h> 177#include <time.h>
178#include <limits.h>
50 179
51/**/ 180#include <signal.h>
181
182#ifdef EV_H
183# include EV_H
184#else
185# include "ev.h"
186#endif
187
188EV_CPP(extern "C" {)
189
190#ifndef _WIN32
191# include <sys/time.h>
192# include <sys/wait.h>
193# include <unistd.h>
194#else
195# include <io.h>
196# define WIN32_LEAN_AND_MEAN
197# include <windows.h>
198# ifndef EV_SELECT_IS_WINSOCKET
199# define EV_SELECT_IS_WINSOCKET 1
200# endif
201# undef EV_AVOID_STDIO
202#endif
203
204/* OS X, in its infinite idiocy, actually HARDCODES
205 * a limit of 1024 into their select. Where people have brains,
206 * OS X engineers apparently have a vacuum. Or maybe they were
207 * ordered to have a vacuum, or they do anything for money.
208 * This might help. Or not.
209 */
210#define _DARWIN_UNLIMITED_SELECT 1
211
212/* this block tries to deduce configuration from header-defined symbols and defaults */
213
214/* try to deduce the maximum number of signals on this platform */
215#if defined (EV_NSIG)
216/* use what's provided */
217#elif defined (NSIG)
218# define EV_NSIG (NSIG)
219#elif defined(_NSIG)
220# define EV_NSIG (_NSIG)
221#elif defined (SIGMAX)
222# define EV_NSIG (SIGMAX+1)
223#elif defined (SIG_MAX)
224# define EV_NSIG (SIG_MAX+1)
225#elif defined (_SIG_MAX)
226# define EV_NSIG (_SIG_MAX+1)
227#elif defined (MAXSIG)
228# define EV_NSIG (MAXSIG+1)
229#elif defined (MAX_SIG)
230# define EV_NSIG (MAX_SIG+1)
231#elif defined (SIGARRAYSIZE)
232# define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
233#elif defined (_sys_nsig)
234# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
235#else
236# error "unable to find value for NSIG, please report"
237/* to make it compile regardless, just remove the above line, */
238/* but consider reporting it, too! :) */
239# define EV_NSIG 65
240#endif
241
242#ifndef EV_USE_FLOOR
243# define EV_USE_FLOOR 0
244#endif
245
246#ifndef EV_USE_CLOCK_SYSCALL
247# if __linux && __GLIBC__ >= 2
248# define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
249# else
250# define EV_USE_CLOCK_SYSCALL 0
251# endif
252#endif
52 253
53#ifndef EV_USE_MONOTONIC 254#ifndef EV_USE_MONOTONIC
255# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
256# define EV_USE_MONOTONIC EV_FEATURE_OS
257# else
54# define EV_USE_MONOTONIC 1 258# define EV_USE_MONOTONIC 0
259# endif
260#endif
261
262#ifndef EV_USE_REALTIME
263# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
264#endif
265
266#ifndef EV_USE_NANOSLEEP
267# if _POSIX_C_SOURCE >= 199309L
268# define EV_USE_NANOSLEEP EV_FEATURE_OS
269# else
270# define EV_USE_NANOSLEEP 0
271# endif
55#endif 272#endif
56 273
57#ifndef EV_USE_SELECT 274#ifndef EV_USE_SELECT
58# define EV_USE_SELECT 1 275# define EV_USE_SELECT EV_FEATURE_BACKENDS
59#endif 276#endif
60 277
61#ifndef EV_USE_POLL 278#ifndef EV_USE_POLL
62# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */ 279# ifdef _WIN32
280# define EV_USE_POLL 0
281# else
282# define EV_USE_POLL EV_FEATURE_BACKENDS
283# endif
63#endif 284#endif
64 285
65#ifndef EV_USE_EPOLL 286#ifndef EV_USE_EPOLL
287# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
288# define EV_USE_EPOLL EV_FEATURE_BACKENDS
289# else
66# define EV_USE_EPOLL 0 290# define EV_USE_EPOLL 0
67#endif 291# endif
292#endif
68 293
294#ifndef EV_USE_KQUEUE
295# define EV_USE_KQUEUE 0
296#endif
297
69#ifndef EV_USE_REALTIME 298#ifndef EV_USE_PORT
70# define EV_USE_REALTIME 1 299# define EV_USE_PORT 0
300#endif
301
302#ifndef EV_USE_INOTIFY
303# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
304# define EV_USE_INOTIFY EV_FEATURE_OS
305# else
306# define EV_USE_INOTIFY 0
71#endif 307# endif
308#endif
72 309
73/**/ 310#ifndef EV_PID_HASHSIZE
311# define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
312#endif
313
314#ifndef EV_INOTIFY_HASHSIZE
315# define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
316#endif
317
318#ifndef EV_USE_EVENTFD
319# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
320# define EV_USE_EVENTFD EV_FEATURE_OS
321# else
322# define EV_USE_EVENTFD 0
323# endif
324#endif
325
326#ifndef EV_USE_SIGNALFD
327# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
328# define EV_USE_SIGNALFD EV_FEATURE_OS
329# else
330# define EV_USE_SIGNALFD 0
331# endif
332#endif
333
334#if 0 /* debugging */
335# define EV_VERIFY 3
336# define EV_USE_4HEAP 1
337# define EV_HEAP_CACHE_AT 1
338#endif
339
340#ifndef EV_VERIFY
341# define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
342#endif
343
344#ifndef EV_USE_4HEAP
345# define EV_USE_4HEAP EV_FEATURE_DATA
346#endif
347
348#ifndef EV_HEAP_CACHE_AT
349# define EV_HEAP_CACHE_AT EV_FEATURE_DATA
350#endif
351
352/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
353/* which makes programs even slower. might work on other unices, too. */
354#if EV_USE_CLOCK_SYSCALL
355# include <syscall.h>
356# ifdef SYS_clock_gettime
357# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
358# undef EV_USE_MONOTONIC
359# define EV_USE_MONOTONIC 1
360# else
361# undef EV_USE_CLOCK_SYSCALL
362# define EV_USE_CLOCK_SYSCALL 0
363# endif
364#endif
365
366/* this block fixes any misconfiguration where we know we run into trouble otherwise */
367
368#ifdef _AIX
369/* AIX has a completely broken poll.h header */
370# undef EV_USE_POLL
371# define EV_USE_POLL 0
372#endif
74 373
75#ifndef CLOCK_MONOTONIC 374#ifndef CLOCK_MONOTONIC
76# undef EV_USE_MONOTONIC 375# undef EV_USE_MONOTONIC
77# define EV_USE_MONOTONIC 0 376# define EV_USE_MONOTONIC 0
78#endif 377#endif
… …
80#ifndef CLOCK_REALTIME 379#ifndef CLOCK_REALTIME
81# undef EV_USE_REALTIME 380# undef EV_USE_REALTIME
82# define EV_USE_REALTIME 0 381# define EV_USE_REALTIME 0
83#endif 382#endif
84 383
384#if !EV_STAT_ENABLE
385# undef EV_USE_INOTIFY
386# define EV_USE_INOTIFY 0
387#endif
388
389#if !EV_USE_NANOSLEEP
390/* hp-ux has it in sys/time.h, which we unconditionally include above */
391# if !defined(_WIN32) && !defined(__hpux)
392# include <sys/select.h>
393# endif
394#endif
395
396#if EV_USE_INOTIFY
397# include <sys/statfs.h>
398# include <sys/inotify.h>
399/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
400# ifndef IN_DONT_FOLLOW
401# undef EV_USE_INOTIFY
402# define EV_USE_INOTIFY 0
403# endif
404#endif
405
406#if EV_SELECT_IS_WINSOCKET
407# include <winsock.h>
408#endif
409
410#if EV_USE_EVENTFD
411/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
412# include <stdint.h>
413# ifndef EFD_NONBLOCK
414# define EFD_NONBLOCK O_NONBLOCK
415# endif
416# ifndef EFD_CLOEXEC
417# ifdef O_CLOEXEC
418# define EFD_CLOEXEC O_CLOEXEC
419# else
420# define EFD_CLOEXEC 02000000
421# endif
422# endif
423EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
424#endif
425
426#if EV_USE_SIGNALFD
427/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
428# include <stdint.h>
429# ifndef SFD_NONBLOCK
430# define SFD_NONBLOCK O_NONBLOCK
431# endif
432# ifndef SFD_CLOEXEC
433# ifdef O_CLOEXEC
434# define SFD_CLOEXEC O_CLOEXEC
435# else
436# define SFD_CLOEXEC 02000000
437# endif
438# endif
439EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
440
441struct signalfd_siginfo
442{
443 uint32_t ssi_signo;
444 char pad[128 - sizeof (uint32_t)];
445};
446#endif
447
85/**/ 448/**/
86 449
450#if EV_VERIFY >= 3
451# define EV_FREQUENT_CHECK ev_verify (EV_A)
452#else
453# define EV_FREQUENT_CHECK do { } while (0)
454#endif
455
456/*
457 * This is used to work around floating point rounding problems.
458 * This value is good at least till the year 4000.
459 */
460#define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
461/*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
462
87#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 463#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
88#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */ 464#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
89#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
90/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
91 465
92#include "ev.h" 466#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
467#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
93 468
94#if __GNUC__ >= 3 469/* the following are taken from libecb */
95# define expect(expr,value) __builtin_expect ((expr),(value)) 470/* ecb.h start */
96# define inline inline 471
472/* many compilers define _GNUC_ to some versions but then only implement
473 * what their idiot authors think are the "more important" extensions,
474 * causing enourmous grief in return for some better fake benchmark numbers.
475 * or so.
476 * we try to detect these and simply assume they are not gcc - if they have
477 * an issue with that they should have done it right in the first place.
478 */
479#ifndef ECB_GCC_VERSION
480 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
481 #define ECB_GCC_VERSION(major,minor) 0
482 #else
483 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
484 #endif
485#endif
486
487#if __cplusplus
488 #define ecb_inline static inline
489#elif ECB_GCC_VERSION(2,5)
490 #define ecb_inline static __inline__
491#elif ECB_C99
492 #define ecb_inline static inline
97#else 493#else
494 #define ecb_inline static
495#endif
496
497#if ECB_GCC_VERSION(3,1)
498 #define ecb_attribute(attrlist) __attribute__(attrlist)
499 #define ecb_is_constant(expr) __builtin_constant_p (expr)
500 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
501 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
502#else
503 #define ecb_attribute(attrlist)
504 #define ecb_is_constant(expr) 0
98# define expect(expr,value) (expr) 505 #define ecb_expect(expr,value) (expr)
99# define inline static 506 #define ecb_prefetch(addr,rw,locality)
100#endif 507#endif
101 508
509#define ecb_noinline ecb_attribute ((__noinline__))
510#define ecb_noreturn ecb_attribute ((__noreturn__))
511#define ecb_unused ecb_attribute ((__unused__))
512#define ecb_const ecb_attribute ((__const__))
513#define ecb_pure ecb_attribute ((__pure__))
514
515#if ECB_GCC_VERSION(4,3)
516 #define ecb_artificial ecb_attribute ((__artificial__))
517 #define ecb_hot ecb_attribute ((__hot__))
518 #define ecb_cold ecb_attribute ((__cold__))
519#else
520 #define ecb_artificial
521 #define ecb_hot
522 #define ecb_cold
523#endif
524
525/* put around conditional expressions if you are very sure that the */
526/* expression is mostly true or mostly false. note that these return */
527/* booleans, not the expression. */
102#define expect_false(expr) expect ((expr) != 0, 0) 528#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
103#define expect_true(expr) expect ((expr) != 0, 1) 529#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
530/* ecb.h end */
104 531
532#define expect_false(cond) ecb_expect_false (cond)
533#define expect_true(cond) ecb_expect_true (cond)
534#define noinline ecb_noinline
535
536#define inline_size ecb_inline
537
538#if EV_FEATURE_CODE
539# define inline_speed ecb_inline
540#else
541# define inline_speed static noinline
542#endif
543
544#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
545
546#if EV_MINPRI == EV_MAXPRI
547# define ABSPRI(w) (((W)w), 0)
548#else
549# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
550#endif
551
552#define EMPTY /* required for microsofts broken pseudo-c compiler */
553#define EMPTY2(a,b) /* used to suppress some warnings */
554
105typedef struct ev_watcher *W; 555typedef ev_watcher *W;
106typedef struct ev_watcher_list *WL; 556typedef ev_watcher_list *WL;
107typedef struct ev_watcher_time *WT; 557typedef ev_watcher_time *WT;
108 558
109static ev_tstamp now_floor, now, diff; /* monotonic clock */ 559#define ev_active(w) ((W)(w))->active
110ev_tstamp ev_now; 560#define ev_at(w) ((WT)(w))->at
111int ev_method;
112 561
113static int have_monotonic; /* runtime */ 562#if EV_USE_REALTIME
563/* sig_atomic_t is used to avoid per-thread variables or locking but still */
564/* giving it a reasonably high chance of working on typical architectures */
565static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
566#endif
114 567
115static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 568#if EV_USE_MONOTONIC
116static void (*method_modify)(int fd, int oev, int nev); 569static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
117static void (*method_poll)(ev_tstamp timeout); 570#endif
571
572#ifndef EV_FD_TO_WIN32_HANDLE
573# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
574#endif
575#ifndef EV_WIN32_HANDLE_TO_FD
576# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
577#endif
578#ifndef EV_WIN32_CLOSE_FD
579# define EV_WIN32_CLOSE_FD(fd) close (fd)
580#endif
581
582#ifdef _WIN32
583# include "ev_win32.c"
584#endif
118 585
119/*****************************************************************************/ 586/*****************************************************************************/
120 587
588/* define a suitable floor function (only used by periodics atm) */
589
590#if EV_USE_FLOOR
591# include <math.h>
592# define ev_floor(v) floor (v)
593#else
594
595#include <float.h>
596
597/* a floor() replacement function, should be independent of ev_tstamp type */
598static ev_tstamp noinline
599ev_floor (ev_tstamp v)
600{
601 /* the choice of shift factor is not terribly important */
602#if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
603 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
604#else
605 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
606#endif
607
608 /* argument too large for an unsigned long? */
609 if (expect_false (v >= shift))
610 {
611 ev_tstamp f;
612
613 if (v == v - 1.)
614 return v; /* very large number */
615
616 f = shift * ev_floor (v * (1. / shift));
617 return f + ev_floor (v - f);
618 }
619
620 /* special treatment for negative args? */
621 if (expect_false (v < 0.))
622 {
623 ev_tstamp f = -ev_floor (-v);
624
625 return f - (f == v ? 0 : 1);
626 }
627
628 /* fits into an unsigned long */
629 return (unsigned long)v;
630}
631
632#endif
633
634/*****************************************************************************/
635
636#ifdef __linux
637# include <sys/utsname.h>
638#endif
639
640static unsigned int noinline ecb_cold
641ev_linux_version (void)
642{
643#ifdef __linux
644 unsigned int v = 0;
645 struct utsname buf;
646 int i;
647 char *p = buf.release;
648
649 if (uname (&buf))
650 return 0;
651
652 for (i = 3+1; --i; )
653 {
654 unsigned int c = 0;
655
656 for (;;)
657 {
658 if (*p >= '0' && *p <= '9')
659 c = c * 10 + *p++ - '0';
660 else
661 {
662 p += *p == '.';
663 break;
664 }
665 }
666
667 v = (v << 8) | c;
668 }
669
670 return v;
671#else
672 return 0;
673#endif
674}
675
676/*****************************************************************************/
677
678#if EV_AVOID_STDIO
679static void noinline ecb_cold
680ev_printerr (const char *msg)
681{
682 write (STDERR_FILENO, msg, strlen (msg));
683}
684#endif
685
686static void (*syserr_cb)(const char *msg);
687
688void ecb_cold
689ev_set_syserr_cb (void (*cb)(const char *msg))
690{
691 syserr_cb = cb;
692}
693
694static void noinline ecb_cold
695ev_syserr (const char *msg)
696{
697 if (!msg)
698 msg = "(libev) system error";
699
700 if (syserr_cb)
701 syserr_cb (msg);
702 else
703 {
704#if EV_AVOID_STDIO
705 ev_printerr (msg);
706 ev_printerr (": ");
707 ev_printerr (strerror (errno));
708 ev_printerr ("\n");
709#else
710 perror (msg);
711#endif
712 abort ();
713 }
714}
715
716static void *
717ev_realloc_emul (void *ptr, long size)
718{
719#if __GLIBC__
720 return realloc (ptr, size);
721#else
722 /* some systems, notably openbsd and darwin, fail to properly
723 * implement realloc (x, 0) (as required by both ansi c-89 and
724 * the single unix specification, so work around them here.
725 */
726
727 if (size)
728 return realloc (ptr, size);
729
730 free (ptr);
731 return 0;
732#endif
733}
734
735static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
736
737void ecb_cold
738ev_set_allocator (void *(*cb)(void *ptr, long size))
739{
740 alloc = cb;
741}
742
743inline_speed void *
744ev_realloc (void *ptr, long size)
745{
746 ptr = alloc (ptr, size);
747
748 if (!ptr && size)
749 {
750#if EV_AVOID_STDIO
751 ev_printerr ("(libev) memory allocation failed, aborting.\n");
752#else
753 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
754#endif
755 abort ();
756 }
757
758 return ptr;
759}
760
761#define ev_malloc(size) ev_realloc (0, (size))
762#define ev_free(ptr) ev_realloc ((ptr), 0)
763
764/*****************************************************************************/
765
766/* set in reify when reification needed */
767#define EV_ANFD_REIFY 1
768
769/* file descriptor info structure */
770typedef struct
771{
772 WL head;
773 unsigned char events; /* the events watched for */
774 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
775 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
776 unsigned char unused;
777#if EV_USE_EPOLL
778 unsigned int egen; /* generation counter to counter epoll bugs */
779#endif
780#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
781 SOCKET handle;
782#endif
783#if EV_USE_IOCP
784 OVERLAPPED or, ow;
785#endif
786} ANFD;
787
788/* stores the pending event set for a given watcher */
789typedef struct
790{
791 W w;
792 int events; /* the pending event set for the given watcher */
793} ANPENDING;
794
795#if EV_USE_INOTIFY
796/* hash table entry per inotify-id */
797typedef struct
798{
799 WL head;
800} ANFS;
801#endif
802
803/* Heap Entry */
804#if EV_HEAP_CACHE_AT
805 /* a heap element */
806 typedef struct {
807 ev_tstamp at;
808 WT w;
809 } ANHE;
810
811 #define ANHE_w(he) (he).w /* access watcher, read-write */
812 #define ANHE_at(he) (he).at /* access cached at, read-only */
813 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
814#else
815 /* a heap element */
816 typedef WT ANHE;
817
818 #define ANHE_w(he) (he)
819 #define ANHE_at(he) (he)->at
820 #define ANHE_at_cache(he)
821#endif
822
823#if EV_MULTIPLICITY
824
825 struct ev_loop
826 {
827 ev_tstamp ev_rt_now;
828 #define ev_rt_now ((loop)->ev_rt_now)
829 #define VAR(name,decl) decl;
830 #include "ev_vars.h"
831 #undef VAR
832 };
833 #include "ev_wrap.h"
834
835 static struct ev_loop default_loop_struct;
836 struct ev_loop *ev_default_loop_ptr;
837
838#else
839
840 ev_tstamp ev_rt_now;
841 #define VAR(name,decl) static decl;
842 #include "ev_vars.h"
843 #undef VAR
844
845 static int ev_default_loop_ptr;
846
847#endif
848
849#if EV_FEATURE_API
850# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
851# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
852# define EV_INVOKE_PENDING invoke_cb (EV_A)
853#else
854# define EV_RELEASE_CB (void)0
855# define EV_ACQUIRE_CB (void)0
856# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
857#endif
858
859#define EVBREAK_RECURSE 0x80
860
861/*****************************************************************************/
862
863#ifndef EV_HAVE_EV_TIME
121ev_tstamp 864ev_tstamp
122ev_time (void) 865ev_time (void)
123{ 866{
124#if EV_USE_REALTIME 867#if EV_USE_REALTIME
868 if (expect_true (have_realtime))
869 {
125 struct timespec ts; 870 struct timespec ts;
126 clock_gettime (CLOCK_REALTIME, &ts); 871 clock_gettime (CLOCK_REALTIME, &ts);
127 return ts.tv_sec + ts.tv_nsec * 1e-9; 872 return ts.tv_sec + ts.tv_nsec * 1e-9;
128#else 873 }
874#endif
875
129 struct timeval tv; 876 struct timeval tv;
130 gettimeofday (&tv, 0); 877 gettimeofday (&tv, 0);
131 return tv.tv_sec + tv.tv_usec * 1e-6; 878 return tv.tv_sec + tv.tv_usec * 1e-6;
132#endif
133} 879}
880#endif
134 881
135static ev_tstamp 882inline_size ev_tstamp
136get_clock (void) 883get_clock (void)
137{ 884{
138#if EV_USE_MONOTONIC 885#if EV_USE_MONOTONIC
139 if (expect_true (have_monotonic)) 886 if (expect_true (have_monotonic))
140 { 887 {
… …
145#endif 892#endif
146 893
147 return ev_time (); 894 return ev_time ();
148} 895}
149 896
150#define array_roundsize(base,n) ((n) | 4 & ~3) 897#if EV_MULTIPLICITY
898ev_tstamp
899ev_now (EV_P)
900{
901 return ev_rt_now;
902}
903#endif
151 904
152#define array_needsize(base,cur,cnt,init) \ 905void
153 if (expect_false ((cnt) > cur)) \ 906ev_sleep (ev_tstamp delay)
154 { \ 907{
155 int newcnt = cur; \ 908 if (delay > 0.)
156 do \
157 { \
158 newcnt = array_roundsize (base, newcnt << 1); \
159 } \
160 while ((cnt) > newcnt); \
161 \
162 base = realloc (base, sizeof (*base) * (newcnt)); \
163 init (base + cur, newcnt - cur); \
164 cur = newcnt; \
165 } 909 {
910#if EV_USE_NANOSLEEP
911 struct timespec ts;
912
913 EV_TS_SET (ts, delay);
914 nanosleep (&ts, 0);
915#elif defined(_WIN32)
916 Sleep ((unsigned long)(delay * 1e3));
917#else
918 struct timeval tv;
919
920 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
921 /* something not guaranteed by newer posix versions, but guaranteed */
922 /* by older ones */
923 EV_TV_SET (tv, delay);
924 select (0, 0, 0, 0, &tv);
925#endif
926 }
927}
166 928
167/*****************************************************************************/ 929/*****************************************************************************/
168 930
169typedef struct 931#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
170{
171 struct ev_io *head;
172 unsigned char events;
173 unsigned char reify;
174} ANFD;
175 932
176static ANFD *anfds; 933/* find a suitable new size for the given array, */
177static int anfdmax; 934/* hopefully by rounding to a nice-to-malloc size */
178 935inline_size int
179static void 936array_nextsize (int elem, int cur, int cnt)
180anfds_init (ANFD *base, int count)
181{ 937{
182 while (count--) 938 int ncur = cur + 1;
183 {
184 base->head = 0;
185 base->events = EV_NONE;
186 base->reify = 0;
187 939
188 ++base; 940 do
941 ncur <<= 1;
942 while (cnt > ncur);
943
944 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
945 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
189 } 946 {
190} 947 ncur *= elem;
191 948 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
192typedef struct 949 ncur = ncur - sizeof (void *) * 4;
193{ 950 ncur /= elem;
194 W w;
195 int events;
196} ANPENDING;
197
198static ANPENDING *pendings;
199static int pendingmax, pendingcnt;
200
201static void
202event (W w, int events)
203{
204 if (w->pending)
205 { 951 }
952
953 return ncur;
954}
955
956static void * noinline ecb_cold
957array_realloc (int elem, void *base, int *cur, int cnt)
958{
959 *cur = array_nextsize (elem, *cur, cnt);
960 return ev_realloc (base, elem * *cur);
961}
962
963#define array_init_zero(base,count) \
964 memset ((void *)(base), 0, sizeof (*(base)) * (count))
965
966#define array_needsize(type,base,cur,cnt,init) \
967 if (expect_false ((cnt) > (cur))) \
968 { \
969 int ecb_unused ocur_ = (cur); \
970 (base) = (type *)array_realloc \
971 (sizeof (type), (base), &(cur), (cnt)); \
972 init ((base) + (ocur_), (cur) - ocur_); \
973 }
974
975#if 0
976#define array_slim(type,stem) \
977 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
978 { \
979 stem ## max = array_roundsize (stem ## cnt >> 1); \
980 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
981 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
982 }
983#endif
984
985#define array_free(stem, idx) \
986 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
987
988/*****************************************************************************/
989
990/* dummy callback for pending events */
991static void noinline
992pendingcb (EV_P_ ev_prepare *w, int revents)
993{
994}
995
996void noinline
997ev_feed_event (EV_P_ void *w, int revents)
998{
999 W w_ = (W)w;
1000 int pri = ABSPRI (w_);
1001
1002 if (expect_false (w_->pending))
1003 pendings [pri][w_->pending - 1].events |= revents;
1004 else
1005 {
1006 w_->pending = ++pendingcnt [pri];
1007 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1008 pendings [pri][w_->pending - 1].w = w_;
206 pendings [w->pending - 1].events |= events; 1009 pendings [pri][w_->pending - 1].events = revents;
207 return;
208 } 1010 }
209
210 w->pending = ++pendingcnt;
211 array_needsize (pendings, pendingmax, pendingcnt, );
212 pendings [pendingcnt - 1].w = w;
213 pendings [pendingcnt - 1].events = events;
214} 1011}
215 1012
216static void 1013inline_speed void
1014feed_reverse (EV_P_ W w)
1015{
1016 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1017 rfeeds [rfeedcnt++] = w;
1018}
1019
1020inline_size void
1021feed_reverse_done (EV_P_ int revents)
1022{
1023 do
1024 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1025 while (rfeedcnt);
1026}
1027
1028inline_speed void
217queue_events (W *events, int eventcnt, int type) 1029queue_events (EV_P_ W *events, int eventcnt, int type)
218{ 1030{
219 int i; 1031 int i;
220 1032
221 for (i = 0; i < eventcnt; ++i) 1033 for (i = 0; i < eventcnt; ++i)
222 event (events [i], type); 1034 ev_feed_event (EV_A_ events [i], type);
223} 1035}
224 1036
225static void 1037/*****************************************************************************/
1038
1039inline_speed void
226fd_event (int fd, int events) 1040fd_event_nocheck (EV_P_ int fd, int revents)
227{ 1041{
228 ANFD *anfd = anfds + fd; 1042 ANFD *anfd = anfds + fd;
229 struct ev_io *w; 1043 ev_io *w;
230 1044
231 for (w = anfd->head; w; w = w->next) 1045 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
232 { 1046 {
233 int ev = w->events & events; 1047 int ev = w->events & revents;
234 1048
235 if (ev) 1049 if (ev)
236 event ((W)w, ev); 1050 ev_feed_event (EV_A_ (W)w, ev);
237 } 1051 }
238} 1052}
239 1053
240/*****************************************************************************/ 1054/* do not submit kernel events for fds that have reify set */
1055/* because that means they changed while we were polling for new events */
1056inline_speed void
1057fd_event (EV_P_ int fd, int revents)
1058{
1059 ANFD *anfd = anfds + fd;
241 1060
242static int *fdchanges; 1061 if (expect_true (!anfd->reify))
243static int fdchangemax, fdchangecnt; 1062 fd_event_nocheck (EV_A_ fd, revents);
1063}
244 1064
245static void 1065void
246fd_reify (void) 1066ev_feed_fd_event (EV_P_ int fd, int revents)
1067{
1068 if (fd >= 0 && fd < anfdmax)
1069 fd_event_nocheck (EV_A_ fd, revents);
1070}
1071
1072/* make sure the external fd watch events are in-sync */
1073/* with the kernel/libev internal state */
1074inline_size void
1075fd_reify (EV_P)
247{ 1076{
248 int i; 1077 int i;
249 1078
1079#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
250 for (i = 0; i < fdchangecnt; ++i) 1080 for (i = 0; i < fdchangecnt; ++i)
251 { 1081 {
252 int fd = fdchanges [i]; 1082 int fd = fdchanges [i];
253 ANFD *anfd = anfds + fd; 1083 ANFD *anfd = anfds + fd;
254 struct ev_io *w;
255 1084
256 int events = 0; 1085 if (anfd->reify & EV__IOFDSET && anfd->head)
257
258 for (w = anfd->head; w; w = w->next)
259 events |= w->events;
260
261 anfd->reify = 0;
262
263 if (anfd->events != events)
264 { 1086 {
1087 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1088
1089 if (handle != anfd->handle)
1090 {
1091 unsigned long arg;
1092
1093 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1094
1095 /* handle changed, but fd didn't - we need to do it in two steps */
265 method_modify (fd, anfd->events, events); 1096 backend_modify (EV_A_ fd, anfd->events, 0);
266 anfd->events = events; 1097 anfd->events = 0;
1098 anfd->handle = handle;
1099 }
267 } 1100 }
268 } 1101 }
1102#endif
1103
1104 for (i = 0; i < fdchangecnt; ++i)
1105 {
1106 int fd = fdchanges [i];
1107 ANFD *anfd = anfds + fd;
1108 ev_io *w;
1109
1110 unsigned char o_events = anfd->events;
1111 unsigned char o_reify = anfd->reify;
1112
1113 anfd->reify = 0;
1114
1115 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1116 {
1117 anfd->events = 0;
1118
1119 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1120 anfd->events |= (unsigned char)w->events;
1121
1122 if (o_events != anfd->events)
1123 o_reify = EV__IOFDSET; /* actually |= */
1124 }
1125
1126 if (o_reify & EV__IOFDSET)
1127 backend_modify (EV_A_ fd, o_events, anfd->events);
1128 }
269 1129
270 fdchangecnt = 0; 1130 fdchangecnt = 0;
271} 1131}
272 1132
273static void 1133/* something about the given fd changed */
274fd_change (int fd) 1134inline_size void
1135fd_change (EV_P_ int fd, int flags)
275{ 1136{
276 if (anfds [fd].reify || fdchangecnt < 0) 1137 unsigned char reify = anfds [fd].reify;
277 return;
278
279 anfds [fd].reify = 1; 1138 anfds [fd].reify |= flags;
280 1139
1140 if (expect_true (!reify))
1141 {
281 ++fdchangecnt; 1142 ++fdchangecnt;
282 array_needsize (fdchanges, fdchangemax, fdchangecnt, ); 1143 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
283 fdchanges [fdchangecnt - 1] = fd; 1144 fdchanges [fdchangecnt - 1] = fd;
1145 }
284} 1146}
285 1147
286static void 1148/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1149inline_speed void ecb_cold
287fd_kill (int fd) 1150fd_kill (EV_P_ int fd)
288{ 1151{
289 struct ev_io *w; 1152 ev_io *w;
290 1153
291 printf ("killing fd %d\n", fd);//D
292 while ((w = anfds [fd].head)) 1154 while ((w = (ev_io *)anfds [fd].head))
293 { 1155 {
294 ev_io_stop (w); 1156 ev_io_stop (EV_A_ w);
295 event ((W)w, EV_ERROR | EV_READ | EV_WRITE); 1157 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
296 } 1158 }
1159}
1160
1161/* check whether the given fd is actually valid, for error recovery */
1162inline_size int ecb_cold
1163fd_valid (int fd)
1164{
1165#ifdef _WIN32
1166 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1167#else
1168 return fcntl (fd, F_GETFD) != -1;
1169#endif
297} 1170}
298 1171
299/* called on EBADF to verify fds */ 1172/* called on EBADF to verify fds */
300static void 1173static void noinline ecb_cold
301fd_ebadf (void) 1174fd_ebadf (EV_P)
302{ 1175{
303 int fd; 1176 int fd;
304 1177
305 for (fd = 0; fd < anfdmax; ++fd) 1178 for (fd = 0; fd < anfdmax; ++fd)
306 if (anfds [fd].events) 1179 if (anfds [fd].events)
307 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF) 1180 if (!fd_valid (fd) && errno == EBADF)
308 fd_kill (fd); 1181 fd_kill (EV_A_ fd);
309} 1182}
310 1183
311/* called on ENOMEM in select/poll to kill some fds and retry */ 1184/* called on ENOMEM in select/poll to kill some fds and retry */
312static void 1185static void noinline ecb_cold
313fd_enomem (void) 1186fd_enomem (EV_P)
314{ 1187{
315 int fd = anfdmax; 1188 int fd;
316 1189
317 while (fd--) 1190 for (fd = anfdmax; fd--; )
318 if (anfds [fd].events) 1191 if (anfds [fd].events)
319 { 1192 {
320 close (fd);
321 fd_kill (fd); 1193 fd_kill (EV_A_ fd);
322 return; 1194 break;
323 } 1195 }
324} 1196}
325 1197
1198/* usually called after fork if backend needs to re-arm all fds from scratch */
1199static void noinline
1200fd_rearm_all (EV_P)
1201{
1202 int fd;
1203
1204 for (fd = 0; fd < anfdmax; ++fd)
1205 if (anfds [fd].events)
1206 {
1207 anfds [fd].events = 0;
1208 anfds [fd].emask = 0;
1209 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1210 }
1211}
1212
1213/* used to prepare libev internal fd's */
1214/* this is not fork-safe */
1215inline_speed void
1216fd_intern (int fd)
1217{
1218#ifdef _WIN32
1219 unsigned long arg = 1;
1220 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1221#else
1222 fcntl (fd, F_SETFD, FD_CLOEXEC);
1223 fcntl (fd, F_SETFL, O_NONBLOCK);
1224#endif
1225}
1226
326/*****************************************************************************/ 1227/*****************************************************************************/
327 1228
328static struct ev_timer **timers; 1229/*
329static int timermax, timercnt; 1230 * the heap functions want a real array index. array index 0 is guaranteed to not
1231 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1232 * the branching factor of the d-tree.
1233 */
330 1234
331static struct ev_periodic **periodics; 1235/*
332static int periodicmax, periodiccnt; 1236 * at the moment we allow libev the luxury of two heaps,
1237 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1238 * which is more cache-efficient.
1239 * the difference is about 5% with 50000+ watchers.
1240 */
1241#if EV_USE_4HEAP
333 1242
1243#define DHEAP 4
1244#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1245#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1246#define UPHEAP_DONE(p,k) ((p) == (k))
1247
1248/* away from the root */
1249inline_speed void
1250downheap (ANHE *heap, int N, int k)
1251{
1252 ANHE he = heap [k];
1253 ANHE *E = heap + N + HEAP0;
1254
1255 for (;;)
1256 {
1257 ev_tstamp minat;
1258 ANHE *minpos;
1259 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1260
1261 /* find minimum child */
1262 if (expect_true (pos + DHEAP - 1 < E))
1263 {
1264 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1265 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1266 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1267 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1268 }
1269 else if (pos < E)
1270 {
1271 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1272 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1273 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1274 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1275 }
1276 else
1277 break;
1278
1279 if (ANHE_at (he) <= minat)
1280 break;
1281
1282 heap [k] = *minpos;
1283 ev_active (ANHE_w (*minpos)) = k;
1284
1285 k = minpos - heap;
1286 }
1287
1288 heap [k] = he;
1289 ev_active (ANHE_w (he)) = k;
1290}
1291
1292#else /* 4HEAP */
1293
1294#define HEAP0 1
1295#define HPARENT(k) ((k) >> 1)
1296#define UPHEAP_DONE(p,k) (!(p))
1297
1298/* away from the root */
1299inline_speed void
1300downheap (ANHE *heap, int N, int k)
1301{
1302 ANHE he = heap [k];
1303
1304 for (;;)
1305 {
1306 int c = k << 1;
1307
1308 if (c >= N + HEAP0)
1309 break;
1310
1311 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1312 ? 1 : 0;
1313
1314 if (ANHE_at (he) <= ANHE_at (heap [c]))
1315 break;
1316
1317 heap [k] = heap [c];
1318 ev_active (ANHE_w (heap [k])) = k;
1319
1320 k = c;
1321 }
1322
1323 heap [k] = he;
1324 ev_active (ANHE_w (he)) = k;
1325}
1326#endif
1327
1328/* towards the root */
1329inline_speed void
1330upheap (ANHE *heap, int k)
1331{
1332 ANHE he = heap [k];
1333
1334 for (;;)
1335 {
1336 int p = HPARENT (k);
1337
1338 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1339 break;
1340
1341 heap [k] = heap [p];
1342 ev_active (ANHE_w (heap [k])) = k;
1343 k = p;
1344 }
1345
1346 heap [k] = he;
1347 ev_active (ANHE_w (he)) = k;
1348}
1349
1350/* move an element suitably so it is in a correct place */
1351inline_size void
1352adjustheap (ANHE *heap, int N, int k)
1353{
1354 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1355 upheap (heap, k);
1356 else
1357 downheap (heap, N, k);
1358}
1359
1360/* rebuild the heap: this function is used only once and executed rarely */
1361inline_size void
1362reheap (ANHE *heap, int N)
1363{
1364 int i;
1365
1366 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1367 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1368 for (i = 0; i < N; ++i)
1369 upheap (heap, i + HEAP0);
1370}
1371
1372/*****************************************************************************/
1373
1374/* associate signal watchers to a signal signal */
1375typedef struct
1376{
1377 EV_ATOMIC_T pending;
1378#if EV_MULTIPLICITY
1379 EV_P;
1380#endif
1381 WL head;
1382} ANSIG;
1383
1384static ANSIG signals [EV_NSIG - 1];
1385
1386/*****************************************************************************/
1387
1388#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1389
1390static void noinline ecb_cold
1391evpipe_init (EV_P)
1392{
1393 if (!ev_is_active (&pipe_w))
1394 {
1395# if EV_USE_EVENTFD
1396 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1397 if (evfd < 0 && errno == EINVAL)
1398 evfd = eventfd (0, 0);
1399
1400 if (evfd >= 0)
1401 {
1402 evpipe [0] = -1;
1403 fd_intern (evfd); /* doing it twice doesn't hurt */
1404 ev_io_set (&pipe_w, evfd, EV_READ);
1405 }
1406 else
1407# endif
1408 {
1409 while (pipe (evpipe))
1410 ev_syserr ("(libev) error creating signal/async pipe");
1411
1412 fd_intern (evpipe [0]);
1413 fd_intern (evpipe [1]);
1414 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1415 }
1416
1417 ev_io_start (EV_A_ &pipe_w);
1418 ev_unref (EV_A); /* watcher should not keep loop alive */
1419 }
1420}
1421
1422inline_speed void
1423evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1424{
1425 if (!*flag)
1426 {
1427 *flag = 1;
1428
1429 pipe_write_skipped = 1;
1430
1431 if (pipe_write_wanted)
1432 {
1433 int old_errno;
1434
1435 pipe_write_skipped = 0;
1436
1437 old_errno = errno; /* save errno because write will clobber it */
1438
1439#if EV_USE_EVENTFD
1440 if (evfd >= 0)
1441 {
1442 uint64_t counter = 1;
1443 write (evfd, &counter, sizeof (uint64_t));
1444 }
1445 else
1446#endif
1447 {
1448 /* win32 people keep sending patches that change this write() to send() */
1449 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1450 /* so when you think this write should be a send instead, please find out */
1451 /* where your send() is from - it's definitely not the microsoft send, and */
1452 /* tell me. thank you. */
1453 write (evpipe [1], &(evpipe [1]), 1);
1454 }
1455
1456 errno = old_errno;
1457 }
1458 }
1459}
1460
1461/* called whenever the libev signal pipe */
1462/* got some events (signal, async) */
334static void 1463static void
335upheap (WT *timers, int k) 1464pipecb (EV_P_ ev_io *iow, int revents)
336{ 1465{
337 WT w = timers [k]; 1466 int i;
338 1467
339 while (k && timers [k >> 1]->at > w->at) 1468 if (revents & EV_READ)
340 {
341 timers [k] = timers [k >> 1];
342 timers [k]->active = k + 1;
343 k >>= 1;
344 } 1469 {
1470#if EV_USE_EVENTFD
1471 if (evfd >= 0)
1472 {
1473 uint64_t counter;
1474 read (evfd, &counter, sizeof (uint64_t));
1475 }
1476 else
1477#endif
1478 {
1479 char dummy;
1480 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1481 read (evpipe [0], &dummy, 1);
1482 }
1483 }
345 1484
346 timers [k] = w; 1485 pipe_write_skipped = 0;
347 timers [k]->active = k + 1;
348 1486
1487#if EV_SIGNAL_ENABLE
1488 if (sig_pending)
1489 {
1490 sig_pending = 0;
1491
1492 for (i = EV_NSIG - 1; i--; )
1493 if (expect_false (signals [i].pending))
1494 ev_feed_signal_event (EV_A_ i + 1);
1495 }
1496#endif
1497
1498#if EV_ASYNC_ENABLE
1499 if (async_pending)
1500 {
1501 async_pending = 0;
1502
1503 for (i = asynccnt; i--; )
1504 if (asyncs [i]->sent)
1505 {
1506 asyncs [i]->sent = 0;
1507 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1508 }
1509 }
1510#endif
1511}
1512
1513/*****************************************************************************/
1514
1515void
1516ev_feed_signal (int signum)
1517{
1518#if EV_MULTIPLICITY
1519 EV_P = signals [signum - 1].loop;
1520
1521 if (!EV_A)
1522 return;
1523#endif
1524
1525 if (!ev_active (&pipe_w))
1526 return;
1527
1528 signals [signum - 1].pending = 1;
1529 evpipe_write (EV_A_ &sig_pending);
349} 1530}
350 1531
351static void 1532static void
352downheap (WT *timers, int N, int k) 1533ev_sighandler (int signum)
353{ 1534{
354 WT w = timers [k]; 1535#ifdef _WIN32
1536 signal (signum, ev_sighandler);
1537#endif
355 1538
356 while (k < (N >> 1)) 1539 ev_feed_signal (signum);
357 { 1540}
358 int j = k << 1;
359 1541
360 if (j + 1 < N && timers [j]->at > timers [j + 1]->at) 1542void noinline
361 ++j; 1543ev_feed_signal_event (EV_P_ int signum)
1544{
1545 WL w;
362 1546
363 if (w->at <= timers [j]->at) 1547 if (expect_false (signum <= 0 || signum > EV_NSIG))
1548 return;
1549
1550 --signum;
1551
1552#if EV_MULTIPLICITY
1553 /* it is permissible to try to feed a signal to the wrong loop */
1554 /* or, likely more useful, feeding a signal nobody is waiting for */
1555
1556 if (expect_false (signals [signum].loop != EV_A))
1557 return;
1558#endif
1559
1560 signals [signum].pending = 0;
1561
1562 for (w = signals [signum].head; w; w = w->next)
1563 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1564}
1565
1566#if EV_USE_SIGNALFD
1567static void
1568sigfdcb (EV_P_ ev_io *iow, int revents)
1569{
1570 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1571
1572 for (;;)
1573 {
1574 ssize_t res = read (sigfd, si, sizeof (si));
1575
1576 /* not ISO-C, as res might be -1, but works with SuS */
1577 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1578 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1579
1580 if (res < (ssize_t)sizeof (si))
364 break; 1581 break;
365
366 timers [k] = timers [j];
367 timers [k]->active = k + 1;
368 k = j;
369 } 1582 }
370
371 timers [k] = w;
372 timers [k]->active = k + 1;
373} 1583}
1584#endif
1585
1586#endif
374 1587
375/*****************************************************************************/ 1588/*****************************************************************************/
376 1589
377typedef struct 1590#if EV_CHILD_ENABLE
378{ 1591static WL childs [EV_PID_HASHSIZE];
379 struct ev_signal *head;
380 sig_atomic_t volatile gotsig;
381} ANSIG;
382 1592
383static ANSIG *signals;
384static int signalmax;
385
386static int sigpipe [2];
387static sig_atomic_t volatile gotsig;
388static struct ev_io sigev;
389
390static void
391signals_init (ANSIG *base, int count)
392{
393 while (count--)
394 {
395 base->head = 0;
396 base->gotsig = 0;
397
398 ++base;
399 }
400}
401
402static void
403sighandler (int signum)
404{
405 signals [signum - 1].gotsig = 1;
406
407 if (!gotsig)
408 {
409 gotsig = 1;
410 write (sigpipe [1], &signum, 1);
411 }
412}
413
414static void
415sigcb (struct ev_io *iow, int revents)
416{
417 struct ev_signal *w;
418 int signum;
419
420 read (sigpipe [0], &revents, 1);
421 gotsig = 0;
422
423 for (signum = signalmax; signum--; )
424 if (signals [signum].gotsig)
425 {
426 signals [signum].gotsig = 0;
427
428 for (w = signals [signum].head; w; w = w->next)
429 event ((W)w, EV_SIGNAL);
430 }
431}
432
433static void
434siginit (void)
435{
436 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
437 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
438
439 /* rather than sort out wether we really need nb, set it */
440 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
441 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
442
443 ev_io_set (&sigev, sigpipe [0], EV_READ);
444 ev_io_start (&sigev);
445}
446
447/*****************************************************************************/
448
449static struct ev_idle **idles;
450static int idlemax, idlecnt;
451
452static struct ev_prepare **prepares;
453static int preparemax, preparecnt;
454
455static struct ev_check **checks;
456static int checkmax, checkcnt;
457
458/*****************************************************************************/
459
460static struct ev_child *childs [PID_HASHSIZE];
461static struct ev_signal childev; 1593static ev_signal childev;
1594
1595#ifndef WIFCONTINUED
1596# define WIFCONTINUED(status) 0
1597#endif
1598
1599/* handle a single child status event */
1600inline_speed void
1601child_reap (EV_P_ int chain, int pid, int status)
1602{
1603 ev_child *w;
1604 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1605
1606 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1607 {
1608 if ((w->pid == pid || !w->pid)
1609 && (!traced || (w->flags & 1)))
1610 {
1611 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1612 w->rpid = pid;
1613 w->rstatus = status;
1614 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1615 }
1616 }
1617}
462 1618
463#ifndef WCONTINUED 1619#ifndef WCONTINUED
464# define WCONTINUED 0 1620# define WCONTINUED 0
465#endif 1621#endif
466 1622
1623/* called on sigchld etc., calls waitpid */
467static void 1624static void
468childcb (struct ev_signal *sw, int revents) 1625childcb (EV_P_ ev_signal *sw, int revents)
469{ 1626{
470 struct ev_child *w;
471 int pid, status; 1627 int pid, status;
472 1628
1629 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
473 while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1) 1630 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
474 for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next) 1631 if (!WCONTINUED
475 if (w->pid == pid || !w->pid) 1632 || errno != EINVAL
476 { 1633 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
477 w->status = status; 1634 return;
478 event ((W)w, EV_CHILD); 1635
479 } 1636 /* make sure we are called again until all children have been reaped */
1637 /* we need to do it this way so that the callback gets called before we continue */
1638 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1639
1640 child_reap (EV_A_ pid, pid, status);
1641 if ((EV_PID_HASHSIZE) > 1)
1642 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
480} 1643}
1644
1645#endif
481 1646
482/*****************************************************************************/ 1647/*****************************************************************************/
483 1648
1649#if EV_USE_IOCP
1650# include "ev_iocp.c"
1651#endif
1652#if EV_USE_PORT
1653# include "ev_port.c"
1654#endif
1655#if EV_USE_KQUEUE
1656# include "ev_kqueue.c"
1657#endif
484#if EV_USE_EPOLL 1658#if EV_USE_EPOLL
485# include "ev_epoll.c" 1659# include "ev_epoll.c"
486#endif 1660#endif
487#if EV_USE_POLL 1661#if EV_USE_POLL
488# include "ev_poll.c" 1662# include "ev_poll.c"
489#endif 1663#endif
490#if EV_USE_SELECT 1664#if EV_USE_SELECT
491# include "ev_select.c" 1665# include "ev_select.c"
492#endif 1666#endif
493 1667
494int 1668int ecb_cold
495ev_version_major (void) 1669ev_version_major (void)
496{ 1670{
497 return EV_VERSION_MAJOR; 1671 return EV_VERSION_MAJOR;
498} 1672}
499 1673
500int 1674int ecb_cold
501ev_version_minor (void) 1675ev_version_minor (void)
502{ 1676{
503 return EV_VERSION_MINOR; 1677 return EV_VERSION_MINOR;
504} 1678}
505 1679
506/* return true if we are running with elevated privileges and ignore env variables */ 1680/* return true if we are running with elevated privileges and should ignore env variables */
507static int 1681int inline_size ecb_cold
508enable_secure () 1682enable_secure (void)
509{ 1683{
1684#ifdef _WIN32
1685 return 0;
1686#else
510 return getuid () != geteuid () 1687 return getuid () != geteuid ()
511 || getgid () != getegid (); 1688 || getgid () != getegid ();
1689#endif
512} 1690}
513 1691
514int ev_init (int methods) 1692unsigned int ecb_cold
1693ev_supported_backends (void)
515{ 1694{
516 if (!ev_method) 1695 unsigned int flags = 0;
1696
1697 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1698 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1699 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1700 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1701 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1702
1703 return flags;
1704}
1705
1706unsigned int ecb_cold
1707ev_recommended_backends (void)
1708{
1709 unsigned int flags = ev_supported_backends ();
1710
1711#ifndef __NetBSD__
1712 /* kqueue is borked on everything but netbsd apparently */
1713 /* it usually doesn't work correctly on anything but sockets and pipes */
1714 flags &= ~EVBACKEND_KQUEUE;
1715#endif
1716#ifdef __APPLE__
1717 /* only select works correctly on that "unix-certified" platform */
1718 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1719 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1720#endif
1721#ifdef __FreeBSD__
1722 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1723#endif
1724
1725 return flags;
1726}
1727
1728unsigned int ecb_cold
1729ev_embeddable_backends (void)
1730{
1731 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1732
1733 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1734 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1735 flags &= ~EVBACKEND_EPOLL;
1736
1737 return flags;
1738}
1739
1740unsigned int
1741ev_backend (EV_P)
1742{
1743 return backend;
1744}
1745
1746#if EV_FEATURE_API
1747unsigned int
1748ev_iteration (EV_P)
1749{
1750 return loop_count;
1751}
1752
1753unsigned int
1754ev_depth (EV_P)
1755{
1756 return loop_depth;
1757}
1758
1759void
1760ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1761{
1762 io_blocktime = interval;
1763}
1764
1765void
1766ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1767{
1768 timeout_blocktime = interval;
1769}
1770
1771void
1772ev_set_userdata (EV_P_ void *data)
1773{
1774 userdata = data;
1775}
1776
1777void *
1778ev_userdata (EV_P)
1779{
1780 return userdata;
1781}
1782
1783void
1784ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1785{
1786 invoke_cb = invoke_pending_cb;
1787}
1788
1789void
1790ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1791{
1792 release_cb = release;
1793 acquire_cb = acquire;
1794}
1795#endif
1796
1797/* initialise a loop structure, must be zero-initialised */
1798static void noinline ecb_cold
1799loop_init (EV_P_ unsigned int flags)
1800{
1801 if (!backend)
517 { 1802 {
1803 origflags = flags;
1804
1805#if EV_USE_REALTIME
1806 if (!have_realtime)
1807 {
1808 struct timespec ts;
1809
1810 if (!clock_gettime (CLOCK_REALTIME, &ts))
1811 have_realtime = 1;
1812 }
1813#endif
1814
518#if EV_USE_MONOTONIC 1815#if EV_USE_MONOTONIC
1816 if (!have_monotonic)
1817 {
1818 struct timespec ts;
1819
1820 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1821 have_monotonic = 1;
1822 }
1823#endif
1824
1825 /* pid check not overridable via env */
1826#ifndef _WIN32
1827 if (flags & EVFLAG_FORKCHECK)
1828 curpid = getpid ();
1829#endif
1830
1831 if (!(flags & EVFLAG_NOENV)
1832 && !enable_secure ()
1833 && getenv ("LIBEV_FLAGS"))
1834 flags = atoi (getenv ("LIBEV_FLAGS"));
1835
1836 ev_rt_now = ev_time ();
1837 mn_now = get_clock ();
1838 now_floor = mn_now;
1839 rtmn_diff = ev_rt_now - mn_now;
1840#if EV_FEATURE_API
1841 invoke_cb = ev_invoke_pending;
1842#endif
1843
1844 io_blocktime = 0.;
1845 timeout_blocktime = 0.;
1846 backend = 0;
1847 backend_fd = -1;
1848 sig_pending = 0;
1849#if EV_ASYNC_ENABLE
1850 async_pending = 0;
1851#endif
1852 pipe_write_skipped = 0;
1853 pipe_write_wanted = 0;
1854#if EV_USE_INOTIFY
1855 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1856#endif
1857#if EV_USE_SIGNALFD
1858 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1859#endif
1860
1861 if (!(flags & EVBACKEND_MASK))
1862 flags |= ev_recommended_backends ();
1863
1864#if EV_USE_IOCP
1865 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1866#endif
1867#if EV_USE_PORT
1868 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1869#endif
1870#if EV_USE_KQUEUE
1871 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1872#endif
1873#if EV_USE_EPOLL
1874 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1875#endif
1876#if EV_USE_POLL
1877 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1878#endif
1879#if EV_USE_SELECT
1880 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1881#endif
1882
1883 ev_prepare_init (&pending_w, pendingcb);
1884
1885#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1886 ev_init (&pipe_w, pipecb);
1887 ev_set_priority (&pipe_w, EV_MAXPRI);
1888#endif
1889 }
1890}
1891
1892/* free up a loop structure */
1893void ecb_cold
1894ev_loop_destroy (EV_P)
1895{
1896 int i;
1897
1898#if EV_MULTIPLICITY
1899 /* mimic free (0) */
1900 if (!EV_A)
1901 return;
1902#endif
1903
1904#if EV_CLEANUP_ENABLE
1905 /* queue cleanup watchers (and execute them) */
1906 if (expect_false (cleanupcnt))
1907 {
1908 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1909 EV_INVOKE_PENDING;
1910 }
1911#endif
1912
1913#if EV_CHILD_ENABLE
1914 if (ev_is_active (&childev))
1915 {
1916 ev_ref (EV_A); /* child watcher */
1917 ev_signal_stop (EV_A_ &childev);
1918 }
1919#endif
1920
1921 if (ev_is_active (&pipe_w))
1922 {
1923 /*ev_ref (EV_A);*/
1924 /*ev_io_stop (EV_A_ &pipe_w);*/
1925
1926#if EV_USE_EVENTFD
1927 if (evfd >= 0)
1928 close (evfd);
1929#endif
1930
1931 if (evpipe [0] >= 0)
1932 {
1933 EV_WIN32_CLOSE_FD (evpipe [0]);
1934 EV_WIN32_CLOSE_FD (evpipe [1]);
1935 }
1936 }
1937
1938#if EV_USE_SIGNALFD
1939 if (ev_is_active (&sigfd_w))
1940 close (sigfd);
1941#endif
1942
1943#if EV_USE_INOTIFY
1944 if (fs_fd >= 0)
1945 close (fs_fd);
1946#endif
1947
1948 if (backend_fd >= 0)
1949 close (backend_fd);
1950
1951#if EV_USE_IOCP
1952 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1953#endif
1954#if EV_USE_PORT
1955 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1956#endif
1957#if EV_USE_KQUEUE
1958 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1959#endif
1960#if EV_USE_EPOLL
1961 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1962#endif
1963#if EV_USE_POLL
1964 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1965#endif
1966#if EV_USE_SELECT
1967 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1968#endif
1969
1970 for (i = NUMPRI; i--; )
1971 {
1972 array_free (pending, [i]);
1973#if EV_IDLE_ENABLE
1974 array_free (idle, [i]);
1975#endif
1976 }
1977
1978 ev_free (anfds); anfds = 0; anfdmax = 0;
1979
1980 /* have to use the microsoft-never-gets-it-right macro */
1981 array_free (rfeed, EMPTY);
1982 array_free (fdchange, EMPTY);
1983 array_free (timer, EMPTY);
1984#if EV_PERIODIC_ENABLE
1985 array_free (periodic, EMPTY);
1986#endif
1987#if EV_FORK_ENABLE
1988 array_free (fork, EMPTY);
1989#endif
1990#if EV_CLEANUP_ENABLE
1991 array_free (cleanup, EMPTY);
1992#endif
1993 array_free (prepare, EMPTY);
1994 array_free (check, EMPTY);
1995#if EV_ASYNC_ENABLE
1996 array_free (async, EMPTY);
1997#endif
1998
1999 backend = 0;
2000
2001#if EV_MULTIPLICITY
2002 if (ev_is_default_loop (EV_A))
2003#endif
2004 ev_default_loop_ptr = 0;
2005#if EV_MULTIPLICITY
2006 else
2007 ev_free (EV_A);
2008#endif
2009}
2010
2011#if EV_USE_INOTIFY
2012inline_size void infy_fork (EV_P);
2013#endif
2014
2015inline_size void
2016loop_fork (EV_P)
2017{
2018#if EV_USE_PORT
2019 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2020#endif
2021#if EV_USE_KQUEUE
2022 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2023#endif
2024#if EV_USE_EPOLL
2025 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2026#endif
2027#if EV_USE_INOTIFY
2028 infy_fork (EV_A);
2029#endif
2030
2031 if (ev_is_active (&pipe_w))
2032 {
2033 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2034
2035 ev_ref (EV_A);
2036 ev_io_stop (EV_A_ &pipe_w);
2037
2038#if EV_USE_EVENTFD
2039 if (evfd >= 0)
2040 close (evfd);
2041#endif
2042
2043 if (evpipe [0] >= 0)
2044 {
2045 EV_WIN32_CLOSE_FD (evpipe [0]);
2046 EV_WIN32_CLOSE_FD (evpipe [1]);
2047 }
2048
2049#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2050 evpipe_init (EV_A);
2051 /* now iterate over everything, in case we missed something */
2052 pipecb (EV_A_ &pipe_w, EV_READ);
2053#endif
2054 }
2055
2056 postfork = 0;
2057}
2058
2059#if EV_MULTIPLICITY
2060
2061struct ev_loop * ecb_cold
2062ev_loop_new (unsigned int flags)
2063{
2064 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2065
2066 memset (EV_A, 0, sizeof (struct ev_loop));
2067 loop_init (EV_A_ flags);
2068
2069 if (ev_backend (EV_A))
2070 return EV_A;
2071
2072 ev_free (EV_A);
2073 return 0;
2074}
2075
2076#endif /* multiplicity */
2077
2078#if EV_VERIFY
2079static void noinline ecb_cold
2080verify_watcher (EV_P_ W w)
2081{
2082 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2083
2084 if (w->pending)
2085 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2086}
2087
2088static void noinline ecb_cold
2089verify_heap (EV_P_ ANHE *heap, int N)
2090{
2091 int i;
2092
2093 for (i = HEAP0; i < N + HEAP0; ++i)
2094 {
2095 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2096 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2097 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2098
2099 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2100 }
2101}
2102
2103static void noinline ecb_cold
2104array_verify (EV_P_ W *ws, int cnt)
2105{
2106 while (cnt--)
2107 {
2108 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2109 verify_watcher (EV_A_ ws [cnt]);
2110 }
2111}
2112#endif
2113
2114#if EV_FEATURE_API
2115void ecb_cold
2116ev_verify (EV_P)
2117{
2118#if EV_VERIFY
2119 int i;
2120 WL w;
2121
2122 assert (activecnt >= -1);
2123
2124 assert (fdchangemax >= fdchangecnt);
2125 for (i = 0; i < fdchangecnt; ++i)
2126 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2127
2128 assert (anfdmax >= 0);
2129 for (i = 0; i < anfdmax; ++i)
2130 for (w = anfds [i].head; w; w = w->next)
519 { 2131 {
520 struct timespec ts; 2132 verify_watcher (EV_A_ (W)w);
521 if (!clock_gettime (CLOCK_MONOTONIC, &ts)) 2133 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
522 have_monotonic = 1; 2134 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
523 } 2135 }
2136
2137 assert (timermax >= timercnt);
2138 verify_heap (EV_A_ timers, timercnt);
2139
2140#if EV_PERIODIC_ENABLE
2141 assert (periodicmax >= periodiccnt);
2142 verify_heap (EV_A_ periodics, periodiccnt);
2143#endif
2144
2145 for (i = NUMPRI; i--; )
2146 {
2147 assert (pendingmax [i] >= pendingcnt [i]);
2148#if EV_IDLE_ENABLE
2149 assert (idleall >= 0);
2150 assert (idlemax [i] >= idlecnt [i]);
2151 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2152#endif
2153 }
2154
2155#if EV_FORK_ENABLE
2156 assert (forkmax >= forkcnt);
2157 array_verify (EV_A_ (W *)forks, forkcnt);
2158#endif
2159
2160#if EV_CLEANUP_ENABLE
2161 assert (cleanupmax >= cleanupcnt);
2162 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2163#endif
2164
2165#if EV_ASYNC_ENABLE
2166 assert (asyncmax >= asynccnt);
2167 array_verify (EV_A_ (W *)asyncs, asynccnt);
2168#endif
2169
2170#if EV_PREPARE_ENABLE
2171 assert (preparemax >= preparecnt);
2172 array_verify (EV_A_ (W *)prepares, preparecnt);
2173#endif
2174
2175#if EV_CHECK_ENABLE
2176 assert (checkmax >= checkcnt);
2177 array_verify (EV_A_ (W *)checks, checkcnt);
2178#endif
2179
2180# if 0
2181#if EV_CHILD_ENABLE
2182 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2183 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2184#endif
524#endif 2185# endif
2186#endif
2187}
2188#endif
525 2189
526 ev_now = ev_time (); 2190#if EV_MULTIPLICITY
527 now = get_clock (); 2191struct ev_loop * ecb_cold
528 now_floor = now; 2192#else
529 diff = ev_now - now; 2193int
2194#endif
2195ev_default_loop (unsigned int flags)
2196{
2197 if (!ev_default_loop_ptr)
2198 {
2199#if EV_MULTIPLICITY
2200 EV_P = ev_default_loop_ptr = &default_loop_struct;
2201#else
2202 ev_default_loop_ptr = 1;
2203#endif
530 2204
531 if (pipe (sigpipe)) 2205 loop_init (EV_A_ flags);
532 return 0;
533 2206
534 if (methods == EVMETHOD_AUTO) 2207 if (ev_backend (EV_A))
535 if (!enable_secure () && getenv ("LIBEV_METHODS")) 2208 {
536 methods = atoi (getenv ("LIBEV_METHODS")); 2209#if EV_CHILD_ENABLE
2210 ev_signal_init (&childev, childcb, SIGCHLD);
2211 ev_set_priority (&childev, EV_MAXPRI);
2212 ev_signal_start (EV_A_ &childev);
2213 ev_unref (EV_A); /* child watcher should not keep loop alive */
2214#endif
2215 }
2216 else
2217 ev_default_loop_ptr = 0;
2218 }
2219
2220 return ev_default_loop_ptr;
2221}
2222
2223void
2224ev_loop_fork (EV_P)
2225{
2226 postfork = 1; /* must be in line with ev_default_fork */
2227}
2228
2229/*****************************************************************************/
2230
2231void
2232ev_invoke (EV_P_ void *w, int revents)
2233{
2234 EV_CB_INVOKE ((W)w, revents);
2235}
2236
2237unsigned int
2238ev_pending_count (EV_P)
2239{
2240 int pri;
2241 unsigned int count = 0;
2242
2243 for (pri = NUMPRI; pri--; )
2244 count += pendingcnt [pri];
2245
2246 return count;
2247}
2248
2249void noinline
2250ev_invoke_pending (EV_P)
2251{
2252 int pri;
2253
2254 for (pri = NUMPRI; pri--; )
2255 while (pendingcnt [pri])
2256 {
2257 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2258
2259 p->w->pending = 0;
2260 EV_CB_INVOKE (p->w, p->events);
2261 EV_FREQUENT_CHECK;
2262 }
2263}
2264
2265#if EV_IDLE_ENABLE
2266/* make idle watchers pending. this handles the "call-idle */
2267/* only when higher priorities are idle" logic */
2268inline_size void
2269idle_reify (EV_P)
2270{
2271 if (expect_false (idleall))
2272 {
2273 int pri;
2274
2275 for (pri = NUMPRI; pri--; )
2276 {
2277 if (pendingcnt [pri])
2278 break;
2279
2280 if (idlecnt [pri])
2281 {
2282 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2283 break;
2284 }
2285 }
2286 }
2287}
2288#endif
2289
2290/* make timers pending */
2291inline_size void
2292timers_reify (EV_P)
2293{
2294 EV_FREQUENT_CHECK;
2295
2296 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2297 {
2298 do
2299 {
2300 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2301
2302 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2303
2304 /* first reschedule or stop timer */
2305 if (w->repeat)
2306 {
2307 ev_at (w) += w->repeat;
2308 if (ev_at (w) < mn_now)
2309 ev_at (w) = mn_now;
2310
2311 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2312
2313 ANHE_at_cache (timers [HEAP0]);
2314 downheap (timers, timercnt, HEAP0);
2315 }
537 else 2316 else
538 methods = EVMETHOD_ANY; 2317 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
539 2318
540 ev_method = 0; 2319 EV_FREQUENT_CHECK;
541#if EV_USE_EPOLL 2320 feed_reverse (EV_A_ (W)w);
542 if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods); 2321 }
543#endif 2322 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
544#if EV_USE_POLL
545 if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
546#endif
547#if EV_USE_SELECT
548 if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
549#endif
550 2323
551 if (ev_method) 2324 feed_reverse_done (EV_A_ EV_TIMER);
2325 }
2326}
2327
2328#if EV_PERIODIC_ENABLE
2329
2330static void noinline
2331periodic_recalc (EV_P_ ev_periodic *w)
2332{
2333 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2334 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2335
2336 /* the above almost always errs on the low side */
2337 while (at <= ev_rt_now)
2338 {
2339 ev_tstamp nat = at + w->interval;
2340
2341 /* when resolution fails us, we use ev_rt_now */
2342 if (expect_false (nat == at))
552 { 2343 {
553 ev_watcher_init (&sigev, sigcb); 2344 at = ev_rt_now;
554 siginit (); 2345 break;
555
556 ev_signal_init (&childev, childcb, SIGCHLD);
557 ev_signal_start (&childev);
558 } 2346 }
2347
2348 at = nat;
2349 }
2350
2351 ev_at (w) = at;
2352}
2353
2354/* make periodics pending */
2355inline_size void
2356periodics_reify (EV_P)
2357{
2358 EV_FREQUENT_CHECK;
2359
2360 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2361 {
2362 int feed_count = 0;
2363
2364 do
2365 {
2366 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2367
2368 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2369
2370 /* first reschedule or stop timer */
2371 if (w->reschedule_cb)
2372 {
2373 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2374
2375 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2376
2377 ANHE_at_cache (periodics [HEAP0]);
2378 downheap (periodics, periodiccnt, HEAP0);
2379 }
2380 else if (w->interval)
2381 {
2382 periodic_recalc (EV_A_ w);
2383 ANHE_at_cache (periodics [HEAP0]);
2384 downheap (periodics, periodiccnt, HEAP0);
2385 }
2386 else
2387 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2388
2389 EV_FREQUENT_CHECK;
2390 feed_reverse (EV_A_ (W)w);
2391 }
2392 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2393
2394 feed_reverse_done (EV_A_ EV_PERIODIC);
2395 }
2396}
2397
2398/* simply recalculate all periodics */
2399/* TODO: maybe ensure that at least one event happens when jumping forward? */
2400static void noinline ecb_cold
2401periodics_reschedule (EV_P)
2402{
2403 int i;
2404
2405 /* adjust periodics after time jump */
2406 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2407 {
2408 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2409
2410 if (w->reschedule_cb)
2411 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2412 else if (w->interval)
2413 periodic_recalc (EV_A_ w);
2414
2415 ANHE_at_cache (periodics [i]);
2416 }
2417
2418 reheap (periodics, periodiccnt);
2419}
2420#endif
2421
2422/* adjust all timers by a given offset */
2423static void noinline ecb_cold
2424timers_reschedule (EV_P_ ev_tstamp adjust)
2425{
2426 int i;
2427
2428 for (i = 0; i < timercnt; ++i)
2429 {
2430 ANHE *he = timers + i + HEAP0;
2431 ANHE_w (*he)->at += adjust;
2432 ANHE_at_cache (*he);
2433 }
2434}
2435
2436/* fetch new monotonic and realtime times from the kernel */
2437/* also detect if there was a timejump, and act accordingly */
2438inline_speed void
2439time_update (EV_P_ ev_tstamp max_block)
2440{
2441#if EV_USE_MONOTONIC
2442 if (expect_true (have_monotonic))
2443 {
2444 int i;
2445 ev_tstamp odiff = rtmn_diff;
2446
2447 mn_now = get_clock ();
2448
2449 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2450 /* interpolate in the meantime */
2451 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2452 {
2453 ev_rt_now = rtmn_diff + mn_now;
2454 return;
2455 }
2456
2457 now_floor = mn_now;
2458 ev_rt_now = ev_time ();
2459
2460 /* loop a few times, before making important decisions.
2461 * on the choice of "4": one iteration isn't enough,
2462 * in case we get preempted during the calls to
2463 * ev_time and get_clock. a second call is almost guaranteed
2464 * to succeed in that case, though. and looping a few more times
2465 * doesn't hurt either as we only do this on time-jumps or
2466 * in the unlikely event of having been preempted here.
2467 */
2468 for (i = 4; --i; )
2469 {
2470 ev_tstamp diff;
2471 rtmn_diff = ev_rt_now - mn_now;
2472
2473 diff = odiff - rtmn_diff;
2474
2475 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2476 return; /* all is well */
2477
2478 ev_rt_now = ev_time ();
2479 mn_now = get_clock ();
2480 now_floor = mn_now;
2481 }
2482
2483 /* no timer adjustment, as the monotonic clock doesn't jump */
2484 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2485# if EV_PERIODIC_ENABLE
2486 periodics_reschedule (EV_A);
2487# endif
2488 }
2489 else
2490#endif
2491 {
2492 ev_rt_now = ev_time ();
2493
2494 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2495 {
2496 /* adjust timers. this is easy, as the offset is the same for all of them */
2497 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2498#if EV_PERIODIC_ENABLE
2499 periodics_reschedule (EV_A);
2500#endif
2501 }
2502
2503 mn_now = ev_rt_now;
2504 }
2505}
2506
2507void
2508ev_run (EV_P_ int flags)
2509{
2510#if EV_FEATURE_API
2511 ++loop_depth;
2512#endif
2513
2514 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2515
2516 loop_done = EVBREAK_CANCEL;
2517
2518 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2519
2520 do
2521 {
2522#if EV_VERIFY >= 2
2523 ev_verify (EV_A);
2524#endif
2525
2526#ifndef _WIN32
2527 if (expect_false (curpid)) /* penalise the forking check even more */
2528 if (expect_false (getpid () != curpid))
2529 {
2530 curpid = getpid ();
2531 postfork = 1;
2532 }
2533#endif
2534
2535#if EV_FORK_ENABLE
2536 /* we might have forked, so queue fork handlers */
2537 if (expect_false (postfork))
2538 if (forkcnt)
2539 {
2540 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2541 EV_INVOKE_PENDING;
2542 }
2543#endif
2544
2545#if EV_PREPARE_ENABLE
2546 /* queue prepare watchers (and execute them) */
2547 if (expect_false (preparecnt))
2548 {
2549 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2550 EV_INVOKE_PENDING;
2551 }
2552#endif
2553
2554 if (expect_false (loop_done))
2555 break;
2556
2557 /* we might have forked, so reify kernel state if necessary */
2558 if (expect_false (postfork))
2559 loop_fork (EV_A);
2560
2561 /* update fd-related kernel structures */
2562 fd_reify (EV_A);
2563
2564 /* calculate blocking time */
2565 {
2566 ev_tstamp waittime = 0.;
2567 ev_tstamp sleeptime = 0.;
2568
2569 /* remember old timestamp for io_blocktime calculation */
2570 ev_tstamp prev_mn_now = mn_now;
2571
2572 /* update time to cancel out callback processing overhead */
2573 time_update (EV_A_ 1e100);
2574
2575 /* from now on, we want a pipe-wake-up */
2576 pipe_write_wanted = 1;
2577
2578 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2579 {
2580 waittime = MAX_BLOCKTIME;
2581
2582 if (timercnt)
2583 {
2584 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2585 if (waittime > to) waittime = to;
2586 }
2587
2588#if EV_PERIODIC_ENABLE
2589 if (periodiccnt)
2590 {
2591 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2592 if (waittime > to) waittime = to;
2593 }
2594#endif
2595
2596 /* don't let timeouts decrease the waittime below timeout_blocktime */
2597 if (expect_false (waittime < timeout_blocktime))
2598 waittime = timeout_blocktime;
2599
2600 /* at this point, we NEED to wait, so we have to ensure */
2601 /* to pass a minimum nonzero value to the backend */
2602 if (expect_false (waittime < backend_mintime))
2603 waittime = backend_mintime;
2604
2605 /* extra check because io_blocktime is commonly 0 */
2606 if (expect_false (io_blocktime))
2607 {
2608 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2609
2610 if (sleeptime > waittime - backend_mintime)
2611 sleeptime = waittime - backend_mintime;
2612
2613 if (expect_true (sleeptime > 0.))
2614 {
2615 ev_sleep (sleeptime);
2616 waittime -= sleeptime;
2617 }
2618 }
2619 }
2620
2621#if EV_FEATURE_API
2622 ++loop_count;
2623#endif
2624 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2625 backend_poll (EV_A_ waittime);
2626 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2627
2628 pipe_write_wanted = 0;
2629
2630 if (pipe_write_skipped)
2631 {
2632 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
2633 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2634 }
2635
2636
2637 /* update ev_rt_now, do magic */
2638 time_update (EV_A_ waittime + sleeptime);
559 } 2639 }
560 2640
561 return ev_method; 2641 /* queue pending timers and reschedule them */
2642 timers_reify (EV_A); /* relative timers called last */
2643#if EV_PERIODIC_ENABLE
2644 periodics_reify (EV_A); /* absolute timers called first */
2645#endif
2646
2647#if EV_IDLE_ENABLE
2648 /* queue idle watchers unless other events are pending */
2649 idle_reify (EV_A);
2650#endif
2651
2652#if EV_CHECK_ENABLE
2653 /* queue check watchers, to be executed first */
2654 if (expect_false (checkcnt))
2655 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2656#endif
2657
2658 EV_INVOKE_PENDING;
2659 }
2660 while (expect_true (
2661 activecnt
2662 && !loop_done
2663 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2664 ));
2665
2666 if (loop_done == EVBREAK_ONE)
2667 loop_done = EVBREAK_CANCEL;
2668
2669#if EV_FEATURE_API
2670 --loop_depth;
2671#endif
2672}
2673
2674void
2675ev_break (EV_P_ int how)
2676{
2677 loop_done = how;
2678}
2679
2680void
2681ev_ref (EV_P)
2682{
2683 ++activecnt;
2684}
2685
2686void
2687ev_unref (EV_P)
2688{
2689 --activecnt;
2690}
2691
2692void
2693ev_now_update (EV_P)
2694{
2695 time_update (EV_A_ 1e100);
2696}
2697
2698void
2699ev_suspend (EV_P)
2700{
2701 ev_now_update (EV_A);
2702}
2703
2704void
2705ev_resume (EV_P)
2706{
2707 ev_tstamp mn_prev = mn_now;
2708
2709 ev_now_update (EV_A);
2710 timers_reschedule (EV_A_ mn_now - mn_prev);
2711#if EV_PERIODIC_ENABLE
2712 /* TODO: really do this? */
2713 periodics_reschedule (EV_A);
2714#endif
562} 2715}
563 2716
564/*****************************************************************************/ 2717/*****************************************************************************/
2718/* singly-linked list management, used when the expected list length is short */
565 2719
566void 2720inline_size void
567ev_fork_prepare (void) 2721wlist_add (WL *head, WL elem)
568{ 2722{
569 /* nop */ 2723 elem->next = *head;
2724 *head = elem;
570} 2725}
571 2726
572void 2727inline_size void
573ev_fork_parent (void) 2728wlist_del (WL *head, WL elem)
574{ 2729{
575 /* nop */ 2730 while (*head)
576} 2731 {
2732 if (expect_true (*head == elem))
2733 {
2734 *head = elem->next;
2735 break;
2736 }
577 2737
578void 2738 head = &(*head)->next;
579ev_fork_child (void) 2739 }
580{ 2740}
581#if EV_USE_EPOLL
582 if (ev_method == EVMETHOD_EPOLL)
583 epoll_postfork_child ();
584#endif
585 2741
586 ev_io_stop (&sigev); 2742/* internal, faster, version of ev_clear_pending */
587 close (sigpipe [0]); 2743inline_speed void
588 close (sigpipe [1]); 2744clear_pending (EV_P_ W w)
589 pipe (sigpipe); 2745{
590 siginit (); 2746 if (w->pending)
2747 {
2748 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2749 w->pending = 0;
2750 }
2751}
2752
2753int
2754ev_clear_pending (EV_P_ void *w)
2755{
2756 W w_ = (W)w;
2757 int pending = w_->pending;
2758
2759 if (expect_true (pending))
2760 {
2761 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2762 p->w = (W)&pending_w;
2763 w_->pending = 0;
2764 return p->events;
2765 }
2766 else
2767 return 0;
2768}
2769
2770inline_size void
2771pri_adjust (EV_P_ W w)
2772{
2773 int pri = ev_priority (w);
2774 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2775 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2776 ev_set_priority (w, pri);
2777}
2778
2779inline_speed void
2780ev_start (EV_P_ W w, int active)
2781{
2782 pri_adjust (EV_A_ w);
2783 w->active = active;
2784 ev_ref (EV_A);
2785}
2786
2787inline_size void
2788ev_stop (EV_P_ W w)
2789{
2790 ev_unref (EV_A);
2791 w->active = 0;
591} 2792}
592 2793
593/*****************************************************************************/ 2794/*****************************************************************************/
594 2795
595static void 2796void noinline
596call_pending (void) 2797ev_io_start (EV_P_ ev_io *w)
597{ 2798{
598 while (pendingcnt) 2799 int fd = w->fd;
2800
2801 if (expect_false (ev_is_active (w)))
2802 return;
2803
2804 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2805 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2806
2807 EV_FREQUENT_CHECK;
2808
2809 ev_start (EV_A_ (W)w, 1);
2810 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2811 wlist_add (&anfds[fd].head, (WL)w);
2812
2813 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2814 w->events &= ~EV__IOFDSET;
2815
2816 EV_FREQUENT_CHECK;
2817}
2818
2819void noinline
2820ev_io_stop (EV_P_ ev_io *w)
2821{
2822 clear_pending (EV_A_ (W)w);
2823 if (expect_false (!ev_is_active (w)))
2824 return;
2825
2826 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2827
2828 EV_FREQUENT_CHECK;
2829
2830 wlist_del (&anfds[w->fd].head, (WL)w);
2831 ev_stop (EV_A_ (W)w);
2832
2833 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2834
2835 EV_FREQUENT_CHECK;
2836}
2837
2838void noinline
2839ev_timer_start (EV_P_ ev_timer *w)
2840{
2841 if (expect_false (ev_is_active (w)))
2842 return;
2843
2844 ev_at (w) += mn_now;
2845
2846 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2847
2848 EV_FREQUENT_CHECK;
2849
2850 ++timercnt;
2851 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2852 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2853 ANHE_w (timers [ev_active (w)]) = (WT)w;
2854 ANHE_at_cache (timers [ev_active (w)]);
2855 upheap (timers, ev_active (w));
2856
2857 EV_FREQUENT_CHECK;
2858
2859 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2860}
2861
2862void noinline
2863ev_timer_stop (EV_P_ ev_timer *w)
2864{
2865 clear_pending (EV_A_ (W)w);
2866 if (expect_false (!ev_is_active (w)))
2867 return;
2868
2869 EV_FREQUENT_CHECK;
2870
599 { 2871 {
600 ANPENDING *p = pendings + --pendingcnt; 2872 int active = ev_active (w);
601 2873
602 if (p->w) 2874 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2875
2876 --timercnt;
2877
2878 if (expect_true (active < timercnt + HEAP0))
603 { 2879 {
604 p->w->pending = 0; 2880 timers [active] = timers [timercnt + HEAP0];
605 p->w->cb (p->w, p->events); 2881 adjustheap (timers, timercnt, active);
606 } 2882 }
2883 }
2884
2885 ev_at (w) -= mn_now;
2886
2887 ev_stop (EV_A_ (W)w);
2888
2889 EV_FREQUENT_CHECK;
2890}
2891
2892void noinline
2893ev_timer_again (EV_P_ ev_timer *w)
2894{
2895 EV_FREQUENT_CHECK;
2896
2897 if (ev_is_active (w))
607 } 2898 {
608}
609
610static void
611timers_reify (void)
612{
613 while (timercnt && timers [0]->at <= now)
614 {
615 struct ev_timer *w = timers [0];
616
617 /* first reschedule or stop timer */
618 if (w->repeat) 2899 if (w->repeat)
619 { 2900 {
620 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
621 w->at = now + w->repeat; 2901 ev_at (w) = mn_now + w->repeat;
622 downheap ((WT *)timers, timercnt, 0); 2902 ANHE_at_cache (timers [ev_active (w)]);
2903 adjustheap (timers, timercnt, ev_active (w));
623 } 2904 }
624 else 2905 else
625 ev_timer_stop (w); /* nonrepeating: stop timer */ 2906 ev_timer_stop (EV_A_ w);
626
627 event ((W)w, EV_TIMEOUT);
628 }
629}
630
631static void
632periodics_reify (void)
633{
634 while (periodiccnt && periodics [0]->at <= ev_now)
635 { 2907 }
636 struct ev_periodic *w = periodics [0]; 2908 else if (w->repeat)
2909 {
2910 ev_at (w) = w->repeat;
2911 ev_timer_start (EV_A_ w);
2912 }
637 2913
638 /* first reschedule or stop timer */ 2914 EV_FREQUENT_CHECK;
2915}
2916
2917ev_tstamp
2918ev_timer_remaining (EV_P_ ev_timer *w)
2919{
2920 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2921}
2922
2923#if EV_PERIODIC_ENABLE
2924void noinline
2925ev_periodic_start (EV_P_ ev_periodic *w)
2926{
2927 if (expect_false (ev_is_active (w)))
2928 return;
2929
2930 if (w->reschedule_cb)
2931 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
639 if (w->interval) 2932 else if (w->interval)
2933 {
2934 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2935 periodic_recalc (EV_A_ w);
2936 }
2937 else
2938 ev_at (w) = w->offset;
2939
2940 EV_FREQUENT_CHECK;
2941
2942 ++periodiccnt;
2943 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2944 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2945 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2946 ANHE_at_cache (periodics [ev_active (w)]);
2947 upheap (periodics, ev_active (w));
2948
2949 EV_FREQUENT_CHECK;
2950
2951 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2952}
2953
2954void noinline
2955ev_periodic_stop (EV_P_ ev_periodic *w)
2956{
2957 clear_pending (EV_A_ (W)w);
2958 if (expect_false (!ev_is_active (w)))
2959 return;
2960
2961 EV_FREQUENT_CHECK;
2962
2963 {
2964 int active = ev_active (w);
2965
2966 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2967
2968 --periodiccnt;
2969
2970 if (expect_true (active < periodiccnt + HEAP0))
2971 {
2972 periodics [active] = periodics [periodiccnt + HEAP0];
2973 adjustheap (periodics, periodiccnt, active);
2974 }
2975 }
2976
2977 ev_stop (EV_A_ (W)w);
2978
2979 EV_FREQUENT_CHECK;
2980}
2981
2982void noinline
2983ev_periodic_again (EV_P_ ev_periodic *w)
2984{
2985 /* TODO: use adjustheap and recalculation */
2986 ev_periodic_stop (EV_A_ w);
2987 ev_periodic_start (EV_A_ w);
2988}
2989#endif
2990
2991#ifndef SA_RESTART
2992# define SA_RESTART 0
2993#endif
2994
2995#if EV_SIGNAL_ENABLE
2996
2997void noinline
2998ev_signal_start (EV_P_ ev_signal *w)
2999{
3000 if (expect_false (ev_is_active (w)))
3001 return;
3002
3003 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3004
3005#if EV_MULTIPLICITY
3006 assert (("libev: a signal must not be attached to two different loops",
3007 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3008
3009 signals [w->signum - 1].loop = EV_A;
3010#endif
3011
3012 EV_FREQUENT_CHECK;
3013
3014#if EV_USE_SIGNALFD
3015 if (sigfd == -2)
3016 {
3017 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3018 if (sigfd < 0 && errno == EINVAL)
3019 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3020
3021 if (sigfd >= 0)
640 { 3022 {
641 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 3023 fd_intern (sigfd); /* doing it twice will not hurt */
642 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now)); 3024
643 downheap ((WT *)periodics, periodiccnt, 0); 3025 sigemptyset (&sigfd_set);
3026
3027 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3028 ev_set_priority (&sigfd_w, EV_MAXPRI);
3029 ev_io_start (EV_A_ &sigfd_w);
3030 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3031 }
3032 }
3033
3034 if (sigfd >= 0)
3035 {
3036 /* TODO: check .head */
3037 sigaddset (&sigfd_set, w->signum);
3038 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3039
3040 signalfd (sigfd, &sigfd_set, 0);
3041 }
3042#endif
3043
3044 ev_start (EV_A_ (W)w, 1);
3045 wlist_add (&signals [w->signum - 1].head, (WL)w);
3046
3047 if (!((WL)w)->next)
3048# if EV_USE_SIGNALFD
3049 if (sigfd < 0) /*TODO*/
3050# endif
3051 {
3052# ifdef _WIN32
3053 evpipe_init (EV_A);
3054
3055 signal (w->signum, ev_sighandler);
3056# else
3057 struct sigaction sa;
3058
3059 evpipe_init (EV_A);
3060
3061 sa.sa_handler = ev_sighandler;
3062 sigfillset (&sa.sa_mask);
3063 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3064 sigaction (w->signum, &sa, 0);
3065
3066 if (origflags & EVFLAG_NOSIGMASK)
3067 {
3068 sigemptyset (&sa.sa_mask);
3069 sigaddset (&sa.sa_mask, w->signum);
3070 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3071 }
3072#endif
3073 }
3074
3075 EV_FREQUENT_CHECK;
3076}
3077
3078void noinline
3079ev_signal_stop (EV_P_ ev_signal *w)
3080{
3081 clear_pending (EV_A_ (W)w);
3082 if (expect_false (!ev_is_active (w)))
3083 return;
3084
3085 EV_FREQUENT_CHECK;
3086
3087 wlist_del (&signals [w->signum - 1].head, (WL)w);
3088 ev_stop (EV_A_ (W)w);
3089
3090 if (!signals [w->signum - 1].head)
3091 {
3092#if EV_MULTIPLICITY
3093 signals [w->signum - 1].loop = 0; /* unattach from signal */
3094#endif
3095#if EV_USE_SIGNALFD
3096 if (sigfd >= 0)
3097 {
3098 sigset_t ss;
3099
3100 sigemptyset (&ss);
3101 sigaddset (&ss, w->signum);
3102 sigdelset (&sigfd_set, w->signum);
3103
3104 signalfd (sigfd, &sigfd_set, 0);
3105 sigprocmask (SIG_UNBLOCK, &ss, 0);
644 } 3106 }
645 else 3107 else
646 ev_periodic_stop (w); /* nonrepeating: stop timer */ 3108#endif
647 3109 signal (w->signum, SIG_DFL);
648 event ((W)w, EV_PERIODIC);
649 }
650}
651
652static void
653periodics_reschedule (ev_tstamp diff)
654{
655 int i;
656
657 /* adjust periodics after time jump */
658 for (i = 0; i < periodiccnt; ++i)
659 { 3110 }
660 struct ev_periodic *w = periodics [i];
661 3111
662 if (w->interval) 3112 EV_FREQUENT_CHECK;
3113}
3114
3115#endif
3116
3117#if EV_CHILD_ENABLE
3118
3119void
3120ev_child_start (EV_P_ ev_child *w)
3121{
3122#if EV_MULTIPLICITY
3123 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3124#endif
3125 if (expect_false (ev_is_active (w)))
3126 return;
3127
3128 EV_FREQUENT_CHECK;
3129
3130 ev_start (EV_A_ (W)w, 1);
3131 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3132
3133 EV_FREQUENT_CHECK;
3134}
3135
3136void
3137ev_child_stop (EV_P_ ev_child *w)
3138{
3139 clear_pending (EV_A_ (W)w);
3140 if (expect_false (!ev_is_active (w)))
3141 return;
3142
3143 EV_FREQUENT_CHECK;
3144
3145 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3146 ev_stop (EV_A_ (W)w);
3147
3148 EV_FREQUENT_CHECK;
3149}
3150
3151#endif
3152
3153#if EV_STAT_ENABLE
3154
3155# ifdef _WIN32
3156# undef lstat
3157# define lstat(a,b) _stati64 (a,b)
3158# endif
3159
3160#define DEF_STAT_INTERVAL 5.0074891
3161#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3162#define MIN_STAT_INTERVAL 0.1074891
3163
3164static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3165
3166#if EV_USE_INOTIFY
3167
3168/* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3169# define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3170
3171static void noinline
3172infy_add (EV_P_ ev_stat *w)
3173{
3174 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
3175
3176 if (w->wd >= 0)
3177 {
3178 struct statfs sfs;
3179
3180 /* now local changes will be tracked by inotify, but remote changes won't */
3181 /* unless the filesystem is known to be local, we therefore still poll */
3182 /* also do poll on <2.6.25, but with normal frequency */
3183
3184 if (!fs_2625)
3185 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3186 else if (!statfs (w->path, &sfs)
3187 && (sfs.f_type == 0x1373 /* devfs */
3188 || sfs.f_type == 0xEF53 /* ext2/3 */
3189 || sfs.f_type == 0x3153464a /* jfs */
3190 || sfs.f_type == 0x52654973 /* reiser3 */
3191 || sfs.f_type == 0x01021994 /* tempfs */
3192 || sfs.f_type == 0x58465342 /* xfs */))
3193 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3194 else
3195 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3196 }
3197 else
3198 {
3199 /* can't use inotify, continue to stat */
3200 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3201
3202 /* if path is not there, monitor some parent directory for speedup hints */
3203 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3204 /* but an efficiency issue only */
3205 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
663 { 3206 {
664 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 3207 char path [4096];
3208 strcpy (path, w->path);
665 3209
666 if (fabs (diff) >= 1e-4) 3210 do
667 { 3211 {
668 ev_periodic_stop (w); 3212 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
669 ev_periodic_start (w); 3213 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
670 3214
671 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 3215 char *pend = strrchr (path, '/');
3216
3217 if (!pend || pend == path)
3218 break;
3219
3220 *pend = 0;
3221 w->wd = inotify_add_watch (fs_fd, path, mask);
3222 }
3223 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3224 }
3225 }
3226
3227 if (w->wd >= 0)
3228 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3229
3230 /* now re-arm timer, if required */
3231 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3232 ev_timer_again (EV_A_ &w->timer);
3233 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3234}
3235
3236static void noinline
3237infy_del (EV_P_ ev_stat *w)
3238{
3239 int slot;
3240 int wd = w->wd;
3241
3242 if (wd < 0)
3243 return;
3244
3245 w->wd = -2;
3246 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3247 wlist_del (&fs_hash [slot].head, (WL)w);
3248
3249 /* remove this watcher, if others are watching it, they will rearm */
3250 inotify_rm_watch (fs_fd, wd);
3251}
3252
3253static void noinline
3254infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3255{
3256 if (slot < 0)
3257 /* overflow, need to check for all hash slots */
3258 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3259 infy_wd (EV_A_ slot, wd, ev);
3260 else
3261 {
3262 WL w_;
3263
3264 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3265 {
3266 ev_stat *w = (ev_stat *)w_;
3267 w_ = w_->next; /* lets us remove this watcher and all before it */
3268
3269 if (w->wd == wd || wd == -1)
3270 {
3271 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3272 {
3273 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3274 w->wd = -1;
3275 infy_add (EV_A_ w); /* re-add, no matter what */
3276 }
3277
3278 stat_timer_cb (EV_A_ &w->timer, 0);
672 } 3279 }
673 } 3280 }
674 } 3281 }
675} 3282}
676 3283
677static int 3284static void
678time_update_monotonic (void) 3285infy_cb (EV_P_ ev_io *w, int revents)
679{ 3286{
680 now = get_clock (); 3287 char buf [EV_INOTIFY_BUFSIZE];
3288 int ofs;
3289 int len = read (fs_fd, buf, sizeof (buf));
681 3290
682 if (expect_true (now - now_floor < MIN_TIMEJUMP * .5)) 3291 for (ofs = 0; ofs < len; )
3292 {
3293 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3294 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3295 ofs += sizeof (struct inotify_event) + ev->len;
683 { 3296 }
684 ev_now = now + diff; 3297}
3298
3299inline_size void ecb_cold
3300ev_check_2625 (EV_P)
3301{
3302 /* kernels < 2.6.25 are borked
3303 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3304 */
3305 if (ev_linux_version () < 0x020619)
685 return 0; 3306 return;
3307
3308 fs_2625 = 1;
3309}
3310
3311inline_size int
3312infy_newfd (void)
3313{
3314#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3315 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3316 if (fd >= 0)
3317 return fd;
3318#endif
3319 return inotify_init ();
3320}
3321
3322inline_size void
3323infy_init (EV_P)
3324{
3325 if (fs_fd != -2)
3326 return;
3327
3328 fs_fd = -1;
3329
3330 ev_check_2625 (EV_A);
3331
3332 fs_fd = infy_newfd ();
3333
3334 if (fs_fd >= 0)
686 } 3335 {
3336 fd_intern (fs_fd);
3337 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3338 ev_set_priority (&fs_w, EV_MAXPRI);
3339 ev_io_start (EV_A_ &fs_w);
3340 ev_unref (EV_A);
3341 }
3342}
3343
3344inline_size void
3345infy_fork (EV_P)
3346{
3347 int slot;
3348
3349 if (fs_fd < 0)
3350 return;
3351
3352 ev_ref (EV_A);
3353 ev_io_stop (EV_A_ &fs_w);
3354 close (fs_fd);
3355 fs_fd = infy_newfd ();
3356
3357 if (fs_fd >= 0)
3358 {
3359 fd_intern (fs_fd);
3360 ev_io_set (&fs_w, fs_fd, EV_READ);
3361 ev_io_start (EV_A_ &fs_w);
3362 ev_unref (EV_A);
3363 }
3364
3365 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3366 {
3367 WL w_ = fs_hash [slot].head;
3368 fs_hash [slot].head = 0;
3369
3370 while (w_)
3371 {
3372 ev_stat *w = (ev_stat *)w_;
3373 w_ = w_->next; /* lets us add this watcher */
3374
3375 w->wd = -1;
3376
3377 if (fs_fd >= 0)
3378 infy_add (EV_A_ w); /* re-add, no matter what */
3379 else
3380 {
3381 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3382 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3383 ev_timer_again (EV_A_ &w->timer);
3384 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3385 }
3386 }
3387 }
3388}
3389
3390#endif
3391
3392#ifdef _WIN32
3393# define EV_LSTAT(p,b) _stati64 (p, b)
3394#else
3395# define EV_LSTAT(p,b) lstat (p, b)
3396#endif
3397
3398void
3399ev_stat_stat (EV_P_ ev_stat *w)
3400{
3401 if (lstat (w->path, &w->attr) < 0)
3402 w->attr.st_nlink = 0;
3403 else if (!w->attr.st_nlink)
3404 w->attr.st_nlink = 1;
3405}
3406
3407static void noinline
3408stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3409{
3410 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3411
3412 ev_statdata prev = w->attr;
3413 ev_stat_stat (EV_A_ w);
3414
3415 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3416 if (
3417 prev.st_dev != w->attr.st_dev
3418 || prev.st_ino != w->attr.st_ino
3419 || prev.st_mode != w->attr.st_mode
3420 || prev.st_nlink != w->attr.st_nlink
3421 || prev.st_uid != w->attr.st_uid
3422 || prev.st_gid != w->attr.st_gid
3423 || prev.st_rdev != w->attr.st_rdev
3424 || prev.st_size != w->attr.st_size
3425 || prev.st_atime != w->attr.st_atime
3426 || prev.st_mtime != w->attr.st_mtime
3427 || prev.st_ctime != w->attr.st_ctime
3428 ) {
3429 /* we only update w->prev on actual differences */
3430 /* in case we test more often than invoke the callback, */
3431 /* to ensure that prev is always different to attr */
3432 w->prev = prev;
3433
3434 #if EV_USE_INOTIFY
3435 if (fs_fd >= 0)
3436 {
3437 infy_del (EV_A_ w);
3438 infy_add (EV_A_ w);
3439 ev_stat_stat (EV_A_ w); /* avoid race... */
3440 }
3441 #endif
3442
3443 ev_feed_event (EV_A_ w, EV_STAT);
3444 }
3445}
3446
3447void
3448ev_stat_start (EV_P_ ev_stat *w)
3449{
3450 if (expect_false (ev_is_active (w)))
3451 return;
3452
3453 ev_stat_stat (EV_A_ w);
3454
3455 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3456 w->interval = MIN_STAT_INTERVAL;
3457
3458 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3459 ev_set_priority (&w->timer, ev_priority (w));
3460
3461#if EV_USE_INOTIFY
3462 infy_init (EV_A);
3463
3464 if (fs_fd >= 0)
3465 infy_add (EV_A_ w);
687 else 3466 else
3467#endif
3468 {
3469 ev_timer_again (EV_A_ &w->timer);
3470 ev_unref (EV_A);
688 { 3471 }
689 now_floor = now; 3472
690 ev_now = ev_time (); 3473 ev_start (EV_A_ (W)w, 1);
3474
3475 EV_FREQUENT_CHECK;
3476}
3477
3478void
3479ev_stat_stop (EV_P_ ev_stat *w)
3480{
3481 clear_pending (EV_A_ (W)w);
3482 if (expect_false (!ev_is_active (w)))
691 return 1; 3483 return;
3484
3485 EV_FREQUENT_CHECK;
3486
3487#if EV_USE_INOTIFY
3488 infy_del (EV_A_ w);
3489#endif
3490
3491 if (ev_is_active (&w->timer))
692 } 3492 {
3493 ev_ref (EV_A);
3494 ev_timer_stop (EV_A_ &w->timer);
3495 }
3496
3497 ev_stop (EV_A_ (W)w);
3498
3499 EV_FREQUENT_CHECK;
3500}
3501#endif
3502
3503#if EV_IDLE_ENABLE
3504void
3505ev_idle_start (EV_P_ ev_idle *w)
3506{
3507 if (expect_false (ev_is_active (w)))
3508 return;
3509
3510 pri_adjust (EV_A_ (W)w);
3511
3512 EV_FREQUENT_CHECK;
3513
3514 {
3515 int active = ++idlecnt [ABSPRI (w)];
3516
3517 ++idleall;
3518 ev_start (EV_A_ (W)w, active);
3519
3520 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3521 idles [ABSPRI (w)][active - 1] = w;
3522 }
3523
3524 EV_FREQUENT_CHECK;
3525}
3526
3527void
3528ev_idle_stop (EV_P_ ev_idle *w)
3529{
3530 clear_pending (EV_A_ (W)w);
3531 if (expect_false (!ev_is_active (w)))
3532 return;
3533
3534 EV_FREQUENT_CHECK;
3535
3536 {
3537 int active = ev_active (w);
3538
3539 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3540 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3541
3542 ev_stop (EV_A_ (W)w);
3543 --idleall;
3544 }
3545
3546 EV_FREQUENT_CHECK;
3547}
3548#endif
3549
3550#if EV_PREPARE_ENABLE
3551void
3552ev_prepare_start (EV_P_ ev_prepare *w)
3553{
3554 if (expect_false (ev_is_active (w)))
3555 return;
3556
3557 EV_FREQUENT_CHECK;
3558
3559 ev_start (EV_A_ (W)w, ++preparecnt);
3560 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3561 prepares [preparecnt - 1] = w;
3562
3563 EV_FREQUENT_CHECK;
3564}
3565
3566void
3567ev_prepare_stop (EV_P_ ev_prepare *w)
3568{
3569 clear_pending (EV_A_ (W)w);
3570 if (expect_false (!ev_is_active (w)))
3571 return;
3572
3573 EV_FREQUENT_CHECK;
3574
3575 {
3576 int active = ev_active (w);
3577
3578 prepares [active - 1] = prepares [--preparecnt];
3579 ev_active (prepares [active - 1]) = active;
3580 }
3581
3582 ev_stop (EV_A_ (W)w);
3583
3584 EV_FREQUENT_CHECK;
3585}
3586#endif
3587
3588#if EV_CHECK_ENABLE
3589void
3590ev_check_start (EV_P_ ev_check *w)
3591{
3592 if (expect_false (ev_is_active (w)))
3593 return;
3594
3595 EV_FREQUENT_CHECK;
3596
3597 ev_start (EV_A_ (W)w, ++checkcnt);
3598 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3599 checks [checkcnt - 1] = w;
3600
3601 EV_FREQUENT_CHECK;
3602}
3603
3604void
3605ev_check_stop (EV_P_ ev_check *w)
3606{
3607 clear_pending (EV_A_ (W)w);
3608 if (expect_false (!ev_is_active (w)))
3609 return;
3610
3611 EV_FREQUENT_CHECK;
3612
3613 {
3614 int active = ev_active (w);
3615
3616 checks [active - 1] = checks [--checkcnt];
3617 ev_active (checks [active - 1]) = active;
3618 }
3619
3620 ev_stop (EV_A_ (W)w);
3621
3622 EV_FREQUENT_CHECK;
3623}
3624#endif
3625
3626#if EV_EMBED_ENABLE
3627void noinline
3628ev_embed_sweep (EV_P_ ev_embed *w)
3629{
3630 ev_run (w->other, EVRUN_NOWAIT);
693} 3631}
694 3632
695static void 3633static void
696time_update (void) 3634embed_io_cb (EV_P_ ev_io *io, int revents)
697{ 3635{
698 int i; 3636 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
699 3637
700#if EV_USE_MONOTONIC 3638 if (ev_cb (w))
701 if (expect_true (have_monotonic)) 3639 ev_feed_event (EV_A_ (W)w, EV_EMBED);
702 {
703 if (time_update_monotonic ())
704 {
705 ev_tstamp odiff = diff;
706
707 for (i = 4; --i; ) /* loop a few times, before making important decisions */
708 {
709 diff = ev_now - now;
710
711 if (fabs (odiff - diff) < MIN_TIMEJUMP)
712 return; /* all is well */
713
714 ev_now = ev_time ();
715 now = get_clock ();
716 now_floor = now;
717 }
718
719 periodics_reschedule (diff - odiff);
720 /* no timer adjustment, as the monotonic clock doesn't jump */
721 }
722 }
723 else 3640 else
724#endif 3641 ev_run (w->other, EVRUN_NOWAIT);
3642}
3643
3644static void
3645embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3646{
3647 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3648
725 { 3649 {
726 ev_now = ev_time (); 3650 EV_P = w->other;
727 3651
728 if (expect_false (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)) 3652 while (fdchangecnt)
729 { 3653 {
730 periodics_reschedule (ev_now - now); 3654 fd_reify (EV_A);
731 3655 ev_run (EV_A_ EVRUN_NOWAIT);
732 /* adjust timers. this is easy, as the offset is the same for all */
733 for (i = 0; i < timercnt; ++i)
734 timers [i]->at += diff;
735 } 3656 }
736
737 now = ev_now;
738 } 3657 }
739} 3658}
740 3659
741int ev_loop_done; 3660static void
742 3661embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
743void ev_loop (int flags)
744{ 3662{
745 double block; 3663 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
746 ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
747 3664
748 do 3665 ev_embed_stop (EV_A_ w);
3666
749 { 3667 {
750 /* queue check watchers (and execute them) */ 3668 EV_P = w->other;
751 if (expect_false (preparecnt))
752 {
753 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
754 call_pending ();
755 }
756 3669
757 /* update fd-related kernel structures */ 3670 ev_loop_fork (EV_A);
758 fd_reify (); 3671 ev_run (EV_A_ EVRUN_NOWAIT);
759
760 /* calculate blocking time */
761
762 /* we only need this for !monotonic clockor timers, but as we basically
763 always have timers, we just calculate it always */
764#if EV_USE_MONOTONIC
765 if (expect_true (have_monotonic))
766 time_update_monotonic ();
767 else
768#endif
769 {
770 ev_now = ev_time ();
771 now = ev_now;
772 }
773
774 if (flags & EVLOOP_NONBLOCK || idlecnt)
775 block = 0.;
776 else
777 {
778 block = MAX_BLOCKTIME;
779
780 if (timercnt)
781 {
782 ev_tstamp to = timers [0]->at - now + method_fudge;
783 if (block > to) block = to;
784 }
785
786 if (periodiccnt)
787 {
788 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
789 if (block > to) block = to;
790 }
791
792 if (block < 0.) block = 0.;
793 }
794
795 method_poll (block);
796
797 /* update ev_now, do magic */
798 time_update ();
799
800 /* queue pending timers and reschedule them */
801 timers_reify (); /* relative timers called last */
802 periodics_reify (); /* absolute timers called first */
803
804 /* queue idle watchers unless io or timers are pending */
805 if (!pendingcnt)
806 queue_events ((W *)idles, idlecnt, EV_IDLE);
807
808 /* queue check watchers, to be executed first */
809 if (checkcnt)
810 queue_events ((W *)checks, checkcnt, EV_CHECK);
811
812 call_pending ();
813 } 3672 }
814 while (!ev_loop_done);
815 3673
816 if (ev_loop_done != 2) 3674 ev_embed_start (EV_A_ w);
817 ev_loop_done = 0;
818} 3675}
3676
3677#if 0
3678static void
3679embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3680{
3681 ev_idle_stop (EV_A_ idle);
3682}
3683#endif
3684
3685void
3686ev_embed_start (EV_P_ ev_embed *w)
3687{
3688 if (expect_false (ev_is_active (w)))
3689 return;
3690
3691 {
3692 EV_P = w->other;
3693 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3694 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3695 }
3696
3697 EV_FREQUENT_CHECK;
3698
3699 ev_set_priority (&w->io, ev_priority (w));
3700 ev_io_start (EV_A_ &w->io);
3701
3702 ev_prepare_init (&w->prepare, embed_prepare_cb);
3703 ev_set_priority (&w->prepare, EV_MINPRI);
3704 ev_prepare_start (EV_A_ &w->prepare);
3705
3706 ev_fork_init (&w->fork, embed_fork_cb);
3707 ev_fork_start (EV_A_ &w->fork);
3708
3709 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3710
3711 ev_start (EV_A_ (W)w, 1);
3712
3713 EV_FREQUENT_CHECK;
3714}
3715
3716void
3717ev_embed_stop (EV_P_ ev_embed *w)
3718{
3719 clear_pending (EV_A_ (W)w);
3720 if (expect_false (!ev_is_active (w)))
3721 return;
3722
3723 EV_FREQUENT_CHECK;
3724
3725 ev_io_stop (EV_A_ &w->io);
3726 ev_prepare_stop (EV_A_ &w->prepare);
3727 ev_fork_stop (EV_A_ &w->fork);
3728
3729 ev_stop (EV_A_ (W)w);
3730
3731 EV_FREQUENT_CHECK;
3732}
3733#endif
3734
3735#if EV_FORK_ENABLE
3736void
3737ev_fork_start (EV_P_ ev_fork *w)
3738{
3739 if (expect_false (ev_is_active (w)))
3740 return;
3741
3742 EV_FREQUENT_CHECK;
3743
3744 ev_start (EV_A_ (W)w, ++forkcnt);
3745 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3746 forks [forkcnt - 1] = w;
3747
3748 EV_FREQUENT_CHECK;
3749}
3750
3751void
3752ev_fork_stop (EV_P_ ev_fork *w)
3753{
3754 clear_pending (EV_A_ (W)w);
3755 if (expect_false (!ev_is_active (w)))
3756 return;
3757
3758 EV_FREQUENT_CHECK;
3759
3760 {
3761 int active = ev_active (w);
3762
3763 forks [active - 1] = forks [--forkcnt];
3764 ev_active (forks [active - 1]) = active;
3765 }
3766
3767 ev_stop (EV_A_ (W)w);
3768
3769 EV_FREQUENT_CHECK;
3770}
3771#endif
3772
3773#if EV_CLEANUP_ENABLE
3774void
3775ev_cleanup_start (EV_P_ ev_cleanup *w)
3776{
3777 if (expect_false (ev_is_active (w)))
3778 return;
3779
3780 EV_FREQUENT_CHECK;
3781
3782 ev_start (EV_A_ (W)w, ++cleanupcnt);
3783 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3784 cleanups [cleanupcnt - 1] = w;
3785
3786 /* cleanup watchers should never keep a refcount on the loop */
3787 ev_unref (EV_A);
3788 EV_FREQUENT_CHECK;
3789}
3790
3791void
3792ev_cleanup_stop (EV_P_ ev_cleanup *w)
3793{
3794 clear_pending (EV_A_ (W)w);
3795 if (expect_false (!ev_is_active (w)))
3796 return;
3797
3798 EV_FREQUENT_CHECK;
3799 ev_ref (EV_A);
3800
3801 {
3802 int active = ev_active (w);
3803
3804 cleanups [active - 1] = cleanups [--cleanupcnt];
3805 ev_active (cleanups [active - 1]) = active;
3806 }
3807
3808 ev_stop (EV_A_ (W)w);
3809
3810 EV_FREQUENT_CHECK;
3811}
3812#endif
3813
3814#if EV_ASYNC_ENABLE
3815void
3816ev_async_start (EV_P_ ev_async *w)
3817{
3818 if (expect_false (ev_is_active (w)))
3819 return;
3820
3821 w->sent = 0;
3822
3823 evpipe_init (EV_A);
3824
3825 EV_FREQUENT_CHECK;
3826
3827 ev_start (EV_A_ (W)w, ++asynccnt);
3828 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3829 asyncs [asynccnt - 1] = w;
3830
3831 EV_FREQUENT_CHECK;
3832}
3833
3834void
3835ev_async_stop (EV_P_ ev_async *w)
3836{
3837 clear_pending (EV_A_ (W)w);
3838 if (expect_false (!ev_is_active (w)))
3839 return;
3840
3841 EV_FREQUENT_CHECK;
3842
3843 {
3844 int active = ev_active (w);
3845
3846 asyncs [active - 1] = asyncs [--asynccnt];
3847 ev_active (asyncs [active - 1]) = active;
3848 }
3849
3850 ev_stop (EV_A_ (W)w);
3851
3852 EV_FREQUENT_CHECK;
3853}
3854
3855void
3856ev_async_send (EV_P_ ev_async *w)
3857{
3858 w->sent = 1;
3859 evpipe_write (EV_A_ &async_pending);
3860}
3861#endif
819 3862
820/*****************************************************************************/ 3863/*****************************************************************************/
821 3864
822static void
823wlist_add (WL *head, WL elem)
824{
825 elem->next = *head;
826 *head = elem;
827}
828
829static void
830wlist_del (WL *head, WL elem)
831{
832 while (*head)
833 {
834 if (*head == elem)
835 {
836 *head = elem->next;
837 return;
838 }
839
840 head = &(*head)->next;
841 }
842}
843
844static void
845ev_clear_pending (W w)
846{
847 if (w->pending)
848 {
849 pendings [w->pending - 1].w = 0;
850 w->pending = 0;
851 }
852}
853
854static void
855ev_start (W w, int active)
856{
857 w->active = active;
858}
859
860static void
861ev_stop (W w)
862{
863 w->active = 0;
864}
865
866/*****************************************************************************/
867
868void
869ev_io_start (struct ev_io *w)
870{
871 int fd = w->fd;
872
873 if (ev_is_active (w))
874 return;
875
876 assert (("ev_io_start called with negative fd", fd >= 0));
877
878 ev_start ((W)w, 1);
879 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
880 wlist_add ((WL *)&anfds[fd].head, (WL)w);
881
882 fd_change (fd);
883}
884
885void
886ev_io_stop (struct ev_io *w)
887{
888 ev_clear_pending ((W)w);
889 if (!ev_is_active (w))
890 return;
891
892 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
893 ev_stop ((W)w);
894
895 fd_change (w->fd);
896}
897
898void
899ev_timer_start (struct ev_timer *w)
900{
901 if (ev_is_active (w))
902 return;
903
904 w->at += now;
905
906 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
907
908 ev_start ((W)w, ++timercnt);
909 array_needsize (timers, timermax, timercnt, );
910 timers [timercnt - 1] = w;
911 upheap ((WT *)timers, timercnt - 1);
912}
913
914void
915ev_timer_stop (struct ev_timer *w)
916{
917 ev_clear_pending ((W)w);
918 if (!ev_is_active (w))
919 return;
920
921 if (w->active < timercnt--)
922 {
923 timers [w->active - 1] = timers [timercnt];
924 downheap ((WT *)timers, timercnt, w->active - 1);
925 }
926
927 w->at = w->repeat;
928
929 ev_stop ((W)w);
930}
931
932void
933ev_timer_again (struct ev_timer *w)
934{
935 if (ev_is_active (w))
936 {
937 if (w->repeat)
938 {
939 w->at = now + w->repeat;
940 downheap ((WT *)timers, timercnt, w->active - 1);
941 }
942 else
943 ev_timer_stop (w);
944 }
945 else if (w->repeat)
946 ev_timer_start (w);
947}
948
949void
950ev_periodic_start (struct ev_periodic *w)
951{
952 if (ev_is_active (w))
953 return;
954
955 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
956
957 /* this formula differs from the one in periodic_reify because we do not always round up */
958 if (w->interval)
959 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
960
961 ev_start ((W)w, ++periodiccnt);
962 array_needsize (periodics, periodicmax, periodiccnt, );
963 periodics [periodiccnt - 1] = w;
964 upheap ((WT *)periodics, periodiccnt - 1);
965}
966
967void
968ev_periodic_stop (struct ev_periodic *w)
969{
970 ev_clear_pending ((W)w);
971 if (!ev_is_active (w))
972 return;
973
974 if (w->active < periodiccnt--)
975 {
976 periodics [w->active - 1] = periodics [periodiccnt];
977 downheap ((WT *)periodics, periodiccnt, w->active - 1);
978 }
979
980 ev_stop ((W)w);
981}
982
983void
984ev_signal_start (struct ev_signal *w)
985{
986 if (ev_is_active (w))
987 return;
988
989 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
990
991 ev_start ((W)w, 1);
992 array_needsize (signals, signalmax, w->signum, signals_init);
993 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
994
995 if (!w->next)
996 {
997 struct sigaction sa;
998 sa.sa_handler = sighandler;
999 sigfillset (&sa.sa_mask);
1000 sa.sa_flags = 0;
1001 sigaction (w->signum, &sa, 0);
1002 }
1003}
1004
1005void
1006ev_signal_stop (struct ev_signal *w)
1007{
1008 ev_clear_pending ((W)w);
1009 if (!ev_is_active (w))
1010 return;
1011
1012 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1013 ev_stop ((W)w);
1014
1015 if (!signals [w->signum - 1].head)
1016 signal (w->signum, SIG_DFL);
1017}
1018
1019void
1020ev_idle_start (struct ev_idle *w)
1021{
1022 if (ev_is_active (w))
1023 return;
1024
1025 ev_start ((W)w, ++idlecnt);
1026 array_needsize (idles, idlemax, idlecnt, );
1027 idles [idlecnt - 1] = w;
1028}
1029
1030void
1031ev_idle_stop (struct ev_idle *w)
1032{
1033 ev_clear_pending ((W)w);
1034 if (ev_is_active (w))
1035 return;
1036
1037 idles [w->active - 1] = idles [--idlecnt];
1038 ev_stop ((W)w);
1039}
1040
1041void
1042ev_prepare_start (struct ev_prepare *w)
1043{
1044 if (ev_is_active (w))
1045 return;
1046
1047 ev_start ((W)w, ++preparecnt);
1048 array_needsize (prepares, preparemax, preparecnt, );
1049 prepares [preparecnt - 1] = w;
1050}
1051
1052void
1053ev_prepare_stop (struct ev_prepare *w)
1054{
1055 ev_clear_pending ((W)w);
1056 if (ev_is_active (w))
1057 return;
1058
1059 prepares [w->active - 1] = prepares [--preparecnt];
1060 ev_stop ((W)w);
1061}
1062
1063void
1064ev_check_start (struct ev_check *w)
1065{
1066 if (ev_is_active (w))
1067 return;
1068
1069 ev_start ((W)w, ++checkcnt);
1070 array_needsize (checks, checkmax, checkcnt, );
1071 checks [checkcnt - 1] = w;
1072}
1073
1074void
1075ev_check_stop (struct ev_check *w)
1076{
1077 ev_clear_pending ((W)w);
1078 if (ev_is_active (w))
1079 return;
1080
1081 checks [w->active - 1] = checks [--checkcnt];
1082 ev_stop ((W)w);
1083}
1084
1085void
1086ev_child_start (struct ev_child *w)
1087{
1088 if (ev_is_active (w))
1089 return;
1090
1091 ev_start ((W)w, 1);
1092 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1093}
1094
1095void
1096ev_child_stop (struct ev_child *w)
1097{
1098 ev_clear_pending ((W)w);
1099 if (ev_is_active (w))
1100 return;
1101
1102 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1103 ev_stop ((W)w);
1104}
1105
1106/*****************************************************************************/
1107
1108struct ev_once 3865struct ev_once
1109{ 3866{
1110 struct ev_io io; 3867 ev_io io;
1111 struct ev_timer to; 3868 ev_timer to;
1112 void (*cb)(int revents, void *arg); 3869 void (*cb)(int revents, void *arg);
1113 void *arg; 3870 void *arg;
1114}; 3871};
1115 3872
1116static void 3873static void
1117once_cb (struct ev_once *once, int revents) 3874once_cb (EV_P_ struct ev_once *once, int revents)
1118{ 3875{
1119 void (*cb)(int revents, void *arg) = once->cb; 3876 void (*cb)(int revents, void *arg) = once->cb;
1120 void *arg = once->arg; 3877 void *arg = once->arg;
1121 3878
1122 ev_io_stop (&once->io); 3879 ev_io_stop (EV_A_ &once->io);
1123 ev_timer_stop (&once->to); 3880 ev_timer_stop (EV_A_ &once->to);
1124 free (once); 3881 ev_free (once);
1125 3882
1126 cb (revents, arg); 3883 cb (revents, arg);
1127} 3884}
1128 3885
1129static void 3886static void
1130once_cb_io (struct ev_io *w, int revents) 3887once_cb_io (EV_P_ ev_io *w, int revents)
1131{ 3888{
1132 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents); 3889 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3890
3891 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
1133} 3892}
1134 3893
1135static void 3894static void
1136once_cb_to (struct ev_timer *w, int revents) 3895once_cb_to (EV_P_ ev_timer *w, int revents)
1137{ 3896{
1138 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents); 3897 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3898
3899 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
1139} 3900}
1140 3901
1141void 3902void
1142ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) 3903ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
1143{ 3904{
1144 struct ev_once *once = malloc (sizeof (struct ev_once)); 3905 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
1145 3906
1146 if (!once) 3907 if (expect_false (!once))
3908 {
1147 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg); 3909 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
1148 else 3910 return;
1149 { 3911 }
3912
1150 once->cb = cb; 3913 once->cb = cb;
1151 once->arg = arg; 3914 once->arg = arg;
1152 3915
1153 ev_watcher_init (&once->io, once_cb_io); 3916 ev_init (&once->io, once_cb_io);
1154 if (fd >= 0) 3917 if (fd >= 0)
3918 {
3919 ev_io_set (&once->io, fd, events);
3920 ev_io_start (EV_A_ &once->io);
3921 }
3922
3923 ev_init (&once->to, once_cb_to);
3924 if (timeout >= 0.)
3925 {
3926 ev_timer_set (&once->to, timeout, 0.);
3927 ev_timer_start (EV_A_ &once->to);
3928 }
3929}
3930
3931/*****************************************************************************/
3932
3933#if EV_WALK_ENABLE
3934void ecb_cold
3935ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3936{
3937 int i, j;
3938 ev_watcher_list *wl, *wn;
3939
3940 if (types & (EV_IO | EV_EMBED))
3941 for (i = 0; i < anfdmax; ++i)
3942 for (wl = anfds [i].head; wl; )
1155 { 3943 {
1156 ev_io_set (&once->io, fd, events); 3944 wn = wl->next;
1157 ev_io_start (&once->io); 3945
3946#if EV_EMBED_ENABLE
3947 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3948 {
3949 if (types & EV_EMBED)
3950 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3951 }
3952 else
3953#endif
3954#if EV_USE_INOTIFY
3955 if (ev_cb ((ev_io *)wl) == infy_cb)
3956 ;
3957 else
3958#endif
3959 if ((ev_io *)wl != &pipe_w)
3960 if (types & EV_IO)
3961 cb (EV_A_ EV_IO, wl);
3962
3963 wl = wn;
1158 } 3964 }
1159 3965
1160 ev_watcher_init (&once->to, once_cb_to); 3966 if (types & (EV_TIMER | EV_STAT))
1161 if (timeout >= 0.) 3967 for (i = timercnt + HEAP0; i-- > HEAP0; )
3968#if EV_STAT_ENABLE
3969 /*TODO: timer is not always active*/
3970 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
1162 { 3971 {
1163 ev_timer_set (&once->to, timeout, 0.); 3972 if (types & EV_STAT)
1164 ev_timer_start (&once->to); 3973 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
1165 } 3974 }
1166 } 3975 else
1167} 3976#endif
3977 if (types & EV_TIMER)
3978 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
1168 3979
1169/*****************************************************************************/ 3980#if EV_PERIODIC_ENABLE
3981 if (types & EV_PERIODIC)
3982 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3983 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3984#endif
1170 3985
1171#if 0 3986#if EV_IDLE_ENABLE
3987 if (types & EV_IDLE)
3988 for (j = NUMPRI; i--; )
3989 for (i = idlecnt [j]; i--; )
3990 cb (EV_A_ EV_IDLE, idles [j][i]);
3991#endif
1172 3992
1173struct ev_io wio; 3993#if EV_FORK_ENABLE
3994 if (types & EV_FORK)
3995 for (i = forkcnt; i--; )
3996 if (ev_cb (forks [i]) != embed_fork_cb)
3997 cb (EV_A_ EV_FORK, forks [i]);
3998#endif
1174 3999
1175static void 4000#if EV_ASYNC_ENABLE
1176sin_cb (struct ev_io *w, int revents) 4001 if (types & EV_ASYNC)
1177{ 4002 for (i = asynccnt; i--; )
1178 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); 4003 cb (EV_A_ EV_ASYNC, asyncs [i]);
1179} 4004#endif
1180 4005
1181static void 4006#if EV_PREPARE_ENABLE
1182ocb (struct ev_timer *w, int revents) 4007 if (types & EV_PREPARE)
1183{ 4008 for (i = preparecnt; i--; )
1184 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); 4009# if EV_EMBED_ENABLE
1185 ev_timer_stop (w); 4010 if (ev_cb (prepares [i]) != embed_prepare_cb)
1186 ev_timer_start (w);
1187}
1188
1189static void
1190scb (struct ev_signal *w, int revents)
1191{
1192 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
1193 ev_io_stop (&wio);
1194 ev_io_start (&wio);
1195}
1196
1197static void
1198gcb (struct ev_signal *w, int revents)
1199{
1200 fprintf (stderr, "generic %x\n", revents);
1201
1202}
1203
1204int main (void)
1205{
1206 ev_init (0);
1207
1208 ev_io_init (&wio, sin_cb, 0, EV_READ);
1209 ev_io_start (&wio);
1210
1211 struct ev_timer t[10000];
1212
1213#if 0
1214 int i;
1215 for (i = 0; i < 10000; ++i)
1216 {
1217 struct ev_timer *w = t + i;
1218 ev_watcher_init (w, ocb, i);
1219 ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
1220 ev_timer_start (w);
1221 if (drand48 () < 0.5)
1222 ev_timer_stop (w);
1223 }
1224#endif 4011# endif
1225 4012 cb (EV_A_ EV_PREPARE, prepares [i]);
1226 struct ev_timer t1;
1227 ev_timer_init (&t1, ocb, 5, 10);
1228 ev_timer_start (&t1);
1229
1230 struct ev_signal sig;
1231 ev_signal_init (&sig, scb, SIGQUIT);
1232 ev_signal_start (&sig);
1233
1234 struct ev_check cw;
1235 ev_check_init (&cw, gcb);
1236 ev_check_start (&cw);
1237
1238 struct ev_idle iw;
1239 ev_idle_init (&iw, gcb);
1240 ev_idle_start (&iw);
1241
1242 ev_loop (0);
1243
1244 return 0;
1245}
1246
1247#endif 4013#endif
1248 4014
4015#if EV_CHECK_ENABLE
4016 if (types & EV_CHECK)
4017 for (i = checkcnt; i--; )
4018 cb (EV_A_ EV_CHECK, checks [i]);
4019#endif
1249 4020
4021#if EV_SIGNAL_ENABLE
4022 if (types & EV_SIGNAL)
4023 for (i = 0; i < EV_NSIG - 1; ++i)
4024 for (wl = signals [i].head; wl; )
4025 {
4026 wn = wl->next;
4027 cb (EV_A_ EV_SIGNAL, wl);
4028 wl = wn;
4029 }
4030#endif
1250 4031
4032#if EV_CHILD_ENABLE
4033 if (types & EV_CHILD)
4034 for (i = (EV_PID_HASHSIZE); i--; )
4035 for (wl = childs [i]; wl; )
4036 {
4037 wn = wl->next;
4038 cb (EV_A_ EV_CHILD, wl);
4039 wl = wn;
4040 }
4041#endif
4042/* EV_STAT 0x00001000 /* stat data changed */
4043/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4044}
4045#endif
1251 4046
4047#if EV_MULTIPLICITY
4048 #include "ev_wrap.h"
4049#endif
4050
4051EV_CPP(})
4052

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