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Comparing libev/ev.c (file contents):
Revision 1.14 by root, Wed Oct 31 11:52:12 2007 UTC vs.
Revision 1.457 by root, Thu Sep 5 18:45:29 2013 UTC

1#include <math.h> 1/*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40/* this big block deduces configuration from config.h */
41#ifndef EV_STANDALONE
42# ifdef EV_CONFIG_H
43# include EV_CONFIG_H
44# else
45# include "config.h"
46# endif
47
48#if HAVE_FLOOR
49# ifndef EV_USE_FLOOR
50# define EV_USE_FLOOR 1
51# endif
52#endif
53
54# if HAVE_CLOCK_SYSCALL
55# ifndef EV_USE_CLOCK_SYSCALL
56# define EV_USE_CLOCK_SYSCALL 1
57# ifndef EV_USE_REALTIME
58# define EV_USE_REALTIME 0
59# endif
60# ifndef EV_USE_MONOTONIC
61# define EV_USE_MONOTONIC 1
62# endif
63# endif
64# elif !defined EV_USE_CLOCK_SYSCALL
65# define EV_USE_CLOCK_SYSCALL 0
66# endif
67
68# if HAVE_CLOCK_GETTIME
69# ifndef EV_USE_MONOTONIC
70# define EV_USE_MONOTONIC 1
71# endif
72# ifndef EV_USE_REALTIME
73# define EV_USE_REALTIME 0
74# endif
75# else
76# ifndef EV_USE_MONOTONIC
77# define EV_USE_MONOTONIC 0
78# endif
79# ifndef EV_USE_REALTIME
80# define EV_USE_REALTIME 0
81# endif
82# endif
83
84# if HAVE_NANOSLEEP
85# ifndef EV_USE_NANOSLEEP
86# define EV_USE_NANOSLEEP EV_FEATURE_OS
87# endif
88# else
89# undef EV_USE_NANOSLEEP
90# define EV_USE_NANOSLEEP 0
91# endif
92
93# if HAVE_SELECT && HAVE_SYS_SELECT_H
94# ifndef EV_USE_SELECT
95# define EV_USE_SELECT EV_FEATURE_BACKENDS
96# endif
97# else
98# undef EV_USE_SELECT
99# define EV_USE_SELECT 0
100# endif
101
102# if HAVE_POLL && HAVE_POLL_H
103# ifndef EV_USE_POLL
104# define EV_USE_POLL EV_FEATURE_BACKENDS
105# endif
106# else
107# undef EV_USE_POLL
108# define EV_USE_POLL 0
109# endif
110
111# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
112# ifndef EV_USE_EPOLL
113# define EV_USE_EPOLL EV_FEATURE_BACKENDS
114# endif
115# else
116# undef EV_USE_EPOLL
117# define EV_USE_EPOLL 0
118# endif
119
120# if HAVE_KQUEUE && HAVE_SYS_EVENT_H
121# ifndef EV_USE_KQUEUE
122# define EV_USE_KQUEUE EV_FEATURE_BACKENDS
123# endif
124# else
125# undef EV_USE_KQUEUE
126# define EV_USE_KQUEUE 0
127# endif
128
129# if HAVE_PORT_H && HAVE_PORT_CREATE
130# ifndef EV_USE_PORT
131# define EV_USE_PORT EV_FEATURE_BACKENDS
132# endif
133# else
134# undef EV_USE_PORT
135# define EV_USE_PORT 0
136# endif
137
138# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
139# ifndef EV_USE_INOTIFY
140# define EV_USE_INOTIFY EV_FEATURE_OS
141# endif
142# else
143# undef EV_USE_INOTIFY
144# define EV_USE_INOTIFY 0
145# endif
146
147# if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
148# ifndef EV_USE_SIGNALFD
149# define EV_USE_SIGNALFD EV_FEATURE_OS
150# endif
151# else
152# undef EV_USE_SIGNALFD
153# define EV_USE_SIGNALFD 0
154# endif
155
156# if HAVE_EVENTFD
157# ifndef EV_USE_EVENTFD
158# define EV_USE_EVENTFD EV_FEATURE_OS
159# endif
160# else
161# undef EV_USE_EVENTFD
162# define EV_USE_EVENTFD 0
163# endif
164
165#endif
166
2#include <stdlib.h> 167#include <stdlib.h>
3#include <unistd.h> 168#include <string.h>
4#include <fcntl.h> 169#include <fcntl.h>
5#include <signal.h> 170#include <stddef.h>
6 171
7#include <stdio.h> 172#include <stdio.h>
8 173
9#include <assert.h> 174#include <assert.h>
10#include <errno.h> 175#include <errno.h>
11#include <sys/time.h> 176#include <sys/types.h>
12#include <time.h> 177#include <time.h>
178#include <limits.h>
13 179
14#define HAVE_EPOLL 1 180#include <signal.h>
15 181
16#ifndef HAVE_MONOTONIC 182#ifdef EV_H
17# ifdef CLOCK_MONOTONIC 183# include EV_H
18# define HAVE_MONOTONIC 1 184#else
185# include "ev.h"
186#endif
187
188#if EV_NO_THREADS
189# undef EV_NO_SMP
190# define EV_NO_SMP 1
191# undef ECB_NO_THREADS
192# define ECB_NO_THREADS 1
193#endif
194#if EV_NO_SMP
195# undef EV_NO_SMP
196# define ECB_NO_SMP 1
197#endif
198
199#ifndef _WIN32
200# include <sys/time.h>
201# include <sys/wait.h>
202# include <unistd.h>
203#else
204# include <io.h>
205# define WIN32_LEAN_AND_MEAN
206# include <winsock2.h>
207# include <windows.h>
208# ifndef EV_SELECT_IS_WINSOCKET
209# define EV_SELECT_IS_WINSOCKET 1
19# endif 210# endif
211# undef EV_AVOID_STDIO
212#endif
213
214/* OS X, in its infinite idiocy, actually HARDCODES
215 * a limit of 1024 into their select. Where people have brains,
216 * OS X engineers apparently have a vacuum. Or maybe they were
217 * ordered to have a vacuum, or they do anything for money.
218 * This might help. Or not.
219 */
220#define _DARWIN_UNLIMITED_SELECT 1
221
222/* this block tries to deduce configuration from header-defined symbols and defaults */
223
224/* try to deduce the maximum number of signals on this platform */
225#if defined EV_NSIG
226/* use what's provided */
227#elif defined NSIG
228# define EV_NSIG (NSIG)
229#elif defined _NSIG
230# define EV_NSIG (_NSIG)
231#elif defined SIGMAX
232# define EV_NSIG (SIGMAX+1)
233#elif defined SIG_MAX
234# define EV_NSIG (SIG_MAX+1)
235#elif defined _SIG_MAX
236# define EV_NSIG (_SIG_MAX+1)
237#elif defined MAXSIG
238# define EV_NSIG (MAXSIG+1)
239#elif defined MAX_SIG
240# define EV_NSIG (MAX_SIG+1)
241#elif defined SIGARRAYSIZE
242# define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
243#elif defined _sys_nsig
244# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
245#else
246# error "unable to find value for NSIG, please report"
247/* to make it compile regardless, just remove the above line, */
248/* but consider reporting it, too! :) */
249# define EV_NSIG 65
250#endif
251
252#ifndef EV_USE_FLOOR
253# define EV_USE_FLOOR 0
254#endif
255
256#ifndef EV_USE_CLOCK_SYSCALL
257# if __linux && __GLIBC__ >= 2
258# define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
259# else
260# define EV_USE_CLOCK_SYSCALL 0
20#endif 261# endif
262#endif
21 263
22#ifndef HAVE_SELECT 264#ifndef EV_USE_MONOTONIC
23# define HAVE_SELECT 1 265# if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
266# define EV_USE_MONOTONIC EV_FEATURE_OS
267# else
268# define EV_USE_MONOTONIC 0
24#endif 269# endif
270#endif
25 271
26#ifndef HAVE_EPOLL 272#ifndef EV_USE_REALTIME
27# define HAVE_EPOLL 0 273# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
274#endif
275
276#ifndef EV_USE_NANOSLEEP
277# if _POSIX_C_SOURCE >= 199309L
278# define EV_USE_NANOSLEEP EV_FEATURE_OS
279# else
280# define EV_USE_NANOSLEEP 0
28#endif 281# endif
282#endif
29 283
30#ifndef HAVE_REALTIME 284#ifndef EV_USE_SELECT
31# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ 285# define EV_USE_SELECT EV_FEATURE_BACKENDS
286#endif
287
288#ifndef EV_USE_POLL
289# ifdef _WIN32
290# define EV_USE_POLL 0
291# else
292# define EV_USE_POLL EV_FEATURE_BACKENDS
32#endif 293# endif
294#endif
295
296#ifndef EV_USE_EPOLL
297# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
298# define EV_USE_EPOLL EV_FEATURE_BACKENDS
299# else
300# define EV_USE_EPOLL 0
301# endif
302#endif
303
304#ifndef EV_USE_KQUEUE
305# define EV_USE_KQUEUE 0
306#endif
307
308#ifndef EV_USE_PORT
309# define EV_USE_PORT 0
310#endif
311
312#ifndef EV_USE_INOTIFY
313# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
314# define EV_USE_INOTIFY EV_FEATURE_OS
315# else
316# define EV_USE_INOTIFY 0
317# endif
318#endif
319
320#ifndef EV_PID_HASHSIZE
321# define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
322#endif
323
324#ifndef EV_INOTIFY_HASHSIZE
325# define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
326#endif
327
328#ifndef EV_USE_EVENTFD
329# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
330# define EV_USE_EVENTFD EV_FEATURE_OS
331# else
332# define EV_USE_EVENTFD 0
333# endif
334#endif
335
336#ifndef EV_USE_SIGNALFD
337# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
338# define EV_USE_SIGNALFD EV_FEATURE_OS
339# else
340# define EV_USE_SIGNALFD 0
341# endif
342#endif
343
344#if 0 /* debugging */
345# define EV_VERIFY 3
346# define EV_USE_4HEAP 1
347# define EV_HEAP_CACHE_AT 1
348#endif
349
350#ifndef EV_VERIFY
351# define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
352#endif
353
354#ifndef EV_USE_4HEAP
355# define EV_USE_4HEAP EV_FEATURE_DATA
356#endif
357
358#ifndef EV_HEAP_CACHE_AT
359# define EV_HEAP_CACHE_AT EV_FEATURE_DATA
360#endif
361
362#ifdef ANDROID
363/* supposedly, android doesn't typedef fd_mask */
364# undef EV_USE_SELECT
365# define EV_USE_SELECT 0
366/* supposedly, we need to include syscall.h, not sys/syscall.h, so just disable */
367# undef EV_USE_CLOCK_SYSCALL
368# define EV_USE_CLOCK_SYSCALL 0
369#endif
370
371/* aix's poll.h seems to cause lots of trouble */
372#ifdef _AIX
373/* AIX has a completely broken poll.h header */
374# undef EV_USE_POLL
375# define EV_USE_POLL 0
376#endif
377
378/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
379/* which makes programs even slower. might work on other unices, too. */
380#if EV_USE_CLOCK_SYSCALL
381# include <sys/syscall.h>
382# ifdef SYS_clock_gettime
383# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
384# undef EV_USE_MONOTONIC
385# define EV_USE_MONOTONIC 1
386# else
387# undef EV_USE_CLOCK_SYSCALL
388# define EV_USE_CLOCK_SYSCALL 0
389# endif
390#endif
391
392/* this block fixes any misconfiguration where we know we run into trouble otherwise */
393
394#ifndef CLOCK_MONOTONIC
395# undef EV_USE_MONOTONIC
396# define EV_USE_MONOTONIC 0
397#endif
398
399#ifndef CLOCK_REALTIME
400# undef EV_USE_REALTIME
401# define EV_USE_REALTIME 0
402#endif
403
404#if !EV_STAT_ENABLE
405# undef EV_USE_INOTIFY
406# define EV_USE_INOTIFY 0
407#endif
408
409#if !EV_USE_NANOSLEEP
410/* hp-ux has it in sys/time.h, which we unconditionally include above */
411# if !defined _WIN32 && !defined __hpux
412# include <sys/select.h>
413# endif
414#endif
415
416#if EV_USE_INOTIFY
417# include <sys/statfs.h>
418# include <sys/inotify.h>
419/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
420# ifndef IN_DONT_FOLLOW
421# undef EV_USE_INOTIFY
422# define EV_USE_INOTIFY 0
423# endif
424#endif
425
426#if EV_USE_EVENTFD
427/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
428# include <stdint.h>
429# ifndef EFD_NONBLOCK
430# define EFD_NONBLOCK O_NONBLOCK
431# endif
432# ifndef EFD_CLOEXEC
433# ifdef O_CLOEXEC
434# define EFD_CLOEXEC O_CLOEXEC
435# else
436# define EFD_CLOEXEC 02000000
437# endif
438# endif
439EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
440#endif
441
442#if EV_USE_SIGNALFD
443/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
444# include <stdint.h>
445# ifndef SFD_NONBLOCK
446# define SFD_NONBLOCK O_NONBLOCK
447# endif
448# ifndef SFD_CLOEXEC
449# ifdef O_CLOEXEC
450# define SFD_CLOEXEC O_CLOEXEC
451# else
452# define SFD_CLOEXEC 02000000
453# endif
454# endif
455EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
456
457struct signalfd_siginfo
458{
459 uint32_t ssi_signo;
460 char pad[128 - sizeof (uint32_t)];
461};
462#endif
463
464/**/
465
466#if EV_VERIFY >= 3
467# define EV_FREQUENT_CHECK ev_verify (EV_A)
468#else
469# define EV_FREQUENT_CHECK do { } while (0)
470#endif
471
472/*
473 * This is used to work around floating point rounding problems.
474 * This value is good at least till the year 4000.
475 */
476#define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
477/*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
33 478
34#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 479#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
35#define MAX_BLOCKTIME 60. 480#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
36 481
37#include "ev.h" 482#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
483#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
38 484
39typedef struct ev_watcher *W; 485/* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
40typedef struct ev_watcher_list *WL; 486/* ECB.H BEGIN */
41typedef struct ev_watcher_time *WT; 487/*
488 * libecb - http://software.schmorp.de/pkg/libecb
489 *
490 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
491 * Copyright (©) 2011 Emanuele Giaquinta
492 * All rights reserved.
493 *
494 * Redistribution and use in source and binary forms, with or without modifica-
495 * tion, are permitted provided that the following conditions are met:
496 *
497 * 1. Redistributions of source code must retain the above copyright notice,
498 * this list of conditions and the following disclaimer.
499 *
500 * 2. Redistributions in binary form must reproduce the above copyright
501 * notice, this list of conditions and the following disclaimer in the
502 * documentation and/or other materials provided with the distribution.
503 *
504 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
505 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
506 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
507 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
508 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
509 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
510 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
511 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
512 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
513 * OF THE POSSIBILITY OF SUCH DAMAGE.
514 */
42 515
43static ev_tstamp now, diff; /* monotonic clock */ 516#ifndef ECB_H
44ev_tstamp ev_now; 517#define ECB_H
45int ev_method;
46 518
47static int have_monotonic; /* runtime */ 519/* 16 bits major, 16 bits minor */
520#define ECB_VERSION 0x00010003
48 521
49static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 522#ifdef _WIN32
50static void (*method_modify)(int fd, int oev, int nev); 523 typedef signed char int8_t;
51static void (*method_poll)(ev_tstamp timeout); 524 typedef unsigned char uint8_t;
525 typedef signed short int16_t;
526 typedef unsigned short uint16_t;
527 typedef signed int int32_t;
528 typedef unsigned int uint32_t;
529 #if __GNUC__
530 typedef signed long long int64_t;
531 typedef unsigned long long uint64_t;
532 #else /* _MSC_VER || __BORLANDC__ */
533 typedef signed __int64 int64_t;
534 typedef unsigned __int64 uint64_t;
535 #endif
536 #ifdef _WIN64
537 #define ECB_PTRSIZE 8
538 typedef uint64_t uintptr_t;
539 typedef int64_t intptr_t;
540 #else
541 #define ECB_PTRSIZE 4
542 typedef uint32_t uintptr_t;
543 typedef int32_t intptr_t;
544 #endif
545#else
546 #include <inttypes.h>
547 #if UINTMAX_MAX > 0xffffffffU
548 #define ECB_PTRSIZE 8
549 #else
550 #define ECB_PTRSIZE 4
551 #endif
552#endif
553
554/* work around x32 idiocy by defining proper macros */
555#if __x86_64 || _M_AMD64
556 #if __ILP32
557 #define ECB_AMD64_X32 1
558 #else
559 #define ECB_AMD64 1
560 #endif
561#endif
562
563/* many compilers define _GNUC_ to some versions but then only implement
564 * what their idiot authors think are the "more important" extensions,
565 * causing enormous grief in return for some better fake benchmark numbers.
566 * or so.
567 * we try to detect these and simply assume they are not gcc - if they have
568 * an issue with that they should have done it right in the first place.
569 */
570#ifndef ECB_GCC_VERSION
571 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
572 #define ECB_GCC_VERSION(major,minor) 0
573 #else
574 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
575 #endif
576#endif
577
578#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
579#define ECB_C99 (__STDC_VERSION__ >= 199901L)
580#define ECB_C11 (__STDC_VERSION__ >= 201112L)
581#define ECB_CPP (__cplusplus+0)
582#define ECB_CPP11 (__cplusplus >= 201103L)
583
584#if ECB_CPP
585 #define ECB_EXTERN_C extern "C"
586 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
587 #define ECB_EXTERN_C_END }
588#else
589 #define ECB_EXTERN_C extern
590 #define ECB_EXTERN_C_BEG
591 #define ECB_EXTERN_C_END
592#endif
52 593
53/*****************************************************************************/ 594/*****************************************************************************/
54 595
596/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
597/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
598
599#if ECB_NO_THREADS
600 #define ECB_NO_SMP 1
601#endif
602
603#if ECB_NO_SMP
604 #define ECB_MEMORY_FENCE do { } while (0)
605#endif
606
607#ifndef ECB_MEMORY_FENCE
608 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
609 #if __i386 || __i386__
610 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
611 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
612 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
613 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
614 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
615 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
616 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
617 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
618 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
619 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
620 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
621 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
622 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
623 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
624 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
625 #elif __sparc || __sparc__
626 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
627 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
628 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
629 #elif defined __s390__ || defined __s390x__
630 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
631 #elif defined __mips__
632 /* GNU/Linux emulates sync on mips1 architectures, so we force it's use */
633 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
634 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
635 #elif defined __alpha__
636 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
637 #elif defined __hppa__
638 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
639 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
640 #elif defined __ia64__
641 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
642 #elif defined __m68k__
643 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
644 #elif defined __m88k__
645 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
646 #elif defined __sh__
647 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
648 #endif
649 #endif
650#endif
651
652#ifndef ECB_MEMORY_FENCE
653 #if ECB_GCC_VERSION(4,7)
654 /* see comment below (stdatomic.h) about the C11 memory model. */
655 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
656
657 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
658 * without risking compile time errors with other compilers. We *could*
659 * define our own ecb_clang_has_feature, but I just can't be bothered to work
660 * around this shit time and again.
661 * #elif defined __clang && __has_feature (cxx_atomic)
662 * // see comment below (stdatomic.h) about the C11 memory model.
663 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
664 */
665
666 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
667 #define ECB_MEMORY_FENCE __sync_synchronize ()
668 #elif _MSC_VER >= 1400 /* VC++ 2005 */
669 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
670 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
671 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
672 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
673 #elif defined _WIN32
674 #include <WinNT.h>
675 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
676 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
677 #include <mbarrier.h>
678 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
679 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
680 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
681 #elif __xlC__
682 #define ECB_MEMORY_FENCE __sync ()
683 #endif
684#endif
685
686#ifndef ECB_MEMORY_FENCE
687 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
688 /* we assume that these memory fences work on all variables/all memory accesses, */
689 /* not just C11 atomics and atomic accesses */
690 #include <stdatomic.h>
691 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
692 /* any fence other than seq_cst, which isn't very efficient for us. */
693 /* Why that is, we don't know - either the C11 memory model is quite useless */
694 /* for most usages, or gcc and clang have a bug */
695 /* I *currently* lean towards the latter, and inefficiently implement */
696 /* all three of ecb's fences as a seq_cst fence */
697 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
698 #endif
699#endif
700
701#ifndef ECB_MEMORY_FENCE
702 #if !ECB_AVOID_PTHREADS
703 /*
704 * if you get undefined symbol references to pthread_mutex_lock,
705 * or failure to find pthread.h, then you should implement
706 * the ECB_MEMORY_FENCE operations for your cpu/compiler
707 * OR provide pthread.h and link against the posix thread library
708 * of your system.
709 */
710 #include <pthread.h>
711 #define ECB_NEEDS_PTHREADS 1
712 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
713
714 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
715 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
716 #endif
717#endif
718
719#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
720 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
721#endif
722
723#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
724 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
725#endif
726
727/*****************************************************************************/
728
729#if __cplusplus
730 #define ecb_inline static inline
731#elif ECB_GCC_VERSION(2,5)
732 #define ecb_inline static __inline__
733#elif ECB_C99
734 #define ecb_inline static inline
735#else
736 #define ecb_inline static
737#endif
738
739#if ECB_GCC_VERSION(3,3)
740 #define ecb_restrict __restrict__
741#elif ECB_C99
742 #define ecb_restrict restrict
743#else
744 #define ecb_restrict
745#endif
746
747typedef int ecb_bool;
748
749#define ECB_CONCAT_(a, b) a ## b
750#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
751#define ECB_STRINGIFY_(a) # a
752#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
753
754#define ecb_function_ ecb_inline
755
756#if ECB_GCC_VERSION(3,1)
757 #define ecb_attribute(attrlist) __attribute__(attrlist)
758 #define ecb_is_constant(expr) __builtin_constant_p (expr)
759 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
760 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
761#else
762 #define ecb_attribute(attrlist)
763 #define ecb_is_constant(expr) 0
764 #define ecb_expect(expr,value) (expr)
765 #define ecb_prefetch(addr,rw,locality)
766#endif
767
768/* no emulation for ecb_decltype */
769#if ECB_GCC_VERSION(4,5)
770 #define ecb_decltype(x) __decltype(x)
771#elif ECB_GCC_VERSION(3,0)
772 #define ecb_decltype(x) __typeof(x)
773#endif
774
775#define ecb_noinline ecb_attribute ((__noinline__))
776#define ecb_unused ecb_attribute ((__unused__))
777#define ecb_const ecb_attribute ((__const__))
778#define ecb_pure ecb_attribute ((__pure__))
779
780#if ECB_C11
781 #define ecb_noreturn _Noreturn
782#else
783 #define ecb_noreturn ecb_attribute ((__noreturn__))
784#endif
785
786#if ECB_GCC_VERSION(4,3)
787 #define ecb_artificial ecb_attribute ((__artificial__))
788 #define ecb_hot ecb_attribute ((__hot__))
789 #define ecb_cold ecb_attribute ((__cold__))
790#else
791 #define ecb_artificial
792 #define ecb_hot
793 #define ecb_cold
794#endif
795
796/* put around conditional expressions if you are very sure that the */
797/* expression is mostly true or mostly false. note that these return */
798/* booleans, not the expression. */
799#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
800#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
801/* for compatibility to the rest of the world */
802#define ecb_likely(expr) ecb_expect_true (expr)
803#define ecb_unlikely(expr) ecb_expect_false (expr)
804
805/* count trailing zero bits and count # of one bits */
806#if ECB_GCC_VERSION(3,4)
807 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
808 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
809 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
810 #define ecb_ctz32(x) __builtin_ctz (x)
811 #define ecb_ctz64(x) __builtin_ctzll (x)
812 #define ecb_popcount32(x) __builtin_popcount (x)
813 /* no popcountll */
814#else
815 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
816 ecb_function_ int
817 ecb_ctz32 (uint32_t x)
818 {
819 int r = 0;
820
821 x &= ~x + 1; /* this isolates the lowest bit */
822
823#if ECB_branchless_on_i386
824 r += !!(x & 0xaaaaaaaa) << 0;
825 r += !!(x & 0xcccccccc) << 1;
826 r += !!(x & 0xf0f0f0f0) << 2;
827 r += !!(x & 0xff00ff00) << 3;
828 r += !!(x & 0xffff0000) << 4;
829#else
830 if (x & 0xaaaaaaaa) r += 1;
831 if (x & 0xcccccccc) r += 2;
832 if (x & 0xf0f0f0f0) r += 4;
833 if (x & 0xff00ff00) r += 8;
834 if (x & 0xffff0000) r += 16;
835#endif
836
837 return r;
838 }
839
840 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
841 ecb_function_ int
842 ecb_ctz64 (uint64_t x)
843 {
844 int shift = x & 0xffffffffU ? 0 : 32;
845 return ecb_ctz32 (x >> shift) + shift;
846 }
847
848 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
849 ecb_function_ int
850 ecb_popcount32 (uint32_t x)
851 {
852 x -= (x >> 1) & 0x55555555;
853 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
854 x = ((x >> 4) + x) & 0x0f0f0f0f;
855 x *= 0x01010101;
856
857 return x >> 24;
858 }
859
860 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
861 ecb_function_ int ecb_ld32 (uint32_t x)
862 {
863 int r = 0;
864
865 if (x >> 16) { x >>= 16; r += 16; }
866 if (x >> 8) { x >>= 8; r += 8; }
867 if (x >> 4) { x >>= 4; r += 4; }
868 if (x >> 2) { x >>= 2; r += 2; }
869 if (x >> 1) { r += 1; }
870
871 return r;
872 }
873
874 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
875 ecb_function_ int ecb_ld64 (uint64_t x)
876 {
877 int r = 0;
878
879 if (x >> 32) { x >>= 32; r += 32; }
880
881 return r + ecb_ld32 (x);
882 }
883#endif
884
885ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
886ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
887ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
888ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
889
890ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
891ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
892{
893 return ( (x * 0x0802U & 0x22110U)
894 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
895}
896
897ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
898ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
899{
900 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
901 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
902 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
903 x = ( x >> 8 ) | ( x << 8);
904
905 return x;
906}
907
908ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
909ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
910{
911 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
912 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
913 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
914 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
915 x = ( x >> 16 ) | ( x << 16);
916
917 return x;
918}
919
920/* popcount64 is only available on 64 bit cpus as gcc builtin */
921/* so for this version we are lazy */
922ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
923ecb_function_ int
924ecb_popcount64 (uint64_t x)
925{
926 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
927}
928
929ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
930ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
931ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
932ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
933ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
934ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
935ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
936ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
937
938ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
939ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
940ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
941ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
942ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
943ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
944ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
945ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
946
947#if ECB_GCC_VERSION(4,3)
948 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
949 #define ecb_bswap32(x) __builtin_bswap32 (x)
950 #define ecb_bswap64(x) __builtin_bswap64 (x)
951#else
952 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
953 ecb_function_ uint16_t
954 ecb_bswap16 (uint16_t x)
955 {
956 return ecb_rotl16 (x, 8);
957 }
958
959 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
960 ecb_function_ uint32_t
961 ecb_bswap32 (uint32_t x)
962 {
963 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
964 }
965
966 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
967 ecb_function_ uint64_t
968 ecb_bswap64 (uint64_t x)
969 {
970 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
971 }
972#endif
973
974#if ECB_GCC_VERSION(4,5)
975 #define ecb_unreachable() __builtin_unreachable ()
976#else
977 /* this seems to work fine, but gcc always emits a warning for it :/ */
978 ecb_inline void ecb_unreachable (void) ecb_noreturn;
979 ecb_inline void ecb_unreachable (void) { }
980#endif
981
982/* try to tell the compiler that some condition is definitely true */
983#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
984
985ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
986ecb_inline unsigned char
987ecb_byteorder_helper (void)
988{
989 /* the union code still generates code under pressure in gcc, */
990 /* but less than using pointers, and always seems to */
991 /* successfully return a constant. */
992 /* the reason why we have this horrible preprocessor mess */
993 /* is to avoid it in all cases, at least on common architectures */
994 /* or when using a recent enough gcc version (>= 4.6) */
995#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
996 return 0x44;
997#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
998 return 0x44;
999#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
1000 return 0x11;
1001#else
1002 union
1003 {
1004 uint32_t i;
1005 uint8_t c;
1006 } u = { 0x11223344 };
1007 return u.c;
1008#endif
1009}
1010
1011ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
1012ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
1013ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
1014ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
1015
1016#if ECB_GCC_VERSION(3,0) || ECB_C99
1017 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
1018#else
1019 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
1020#endif
1021
1022#if __cplusplus
1023 template<typename T>
1024 static inline T ecb_div_rd (T val, T div)
1025 {
1026 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
1027 }
1028 template<typename T>
1029 static inline T ecb_div_ru (T val, T div)
1030 {
1031 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
1032 }
1033#else
1034 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
1035 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
1036#endif
1037
1038#if ecb_cplusplus_does_not_suck
1039 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
1040 template<typename T, int N>
1041 static inline int ecb_array_length (const T (&arr)[N])
1042 {
1043 return N;
1044 }
1045#else
1046 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
1047#endif
1048
1049/*******************************************************************************/
1050/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
1051
1052/* basically, everything uses "ieee pure-endian" floating point numbers */
1053/* the only noteworthy exception is ancient armle, which uses order 43218765 */
1054#if 0 \
1055 || __i386 || __i386__ \
1056 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
1057 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
1058 || defined __arm__ && defined __ARM_EABI__ \
1059 || defined __s390__ || defined __s390x__ \
1060 || defined __mips__ \
1061 || defined __alpha__ \
1062 || defined __hppa__ \
1063 || defined __ia64__ \
1064 || defined __m68k__ \
1065 || defined __m88k__ \
1066 || defined __sh__ \
1067 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
1068 #define ECB_STDFP 1
1069 #include <string.h> /* for memcpy */
1070#else
1071 #define ECB_STDFP 0
1072 #include <math.h> /* for frexp*, ldexp* */
1073#endif
1074
1075#ifndef ECB_NO_LIBM
1076
1077 /* convert a float to ieee single/binary32 */
1078 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
1079 ecb_function_ uint32_t
1080 ecb_float_to_binary32 (float x)
1081 {
1082 uint32_t r;
1083
1084 #if ECB_STDFP
1085 memcpy (&r, &x, 4);
1086 #else
1087 /* slow emulation, works for anything but -0 */
1088 uint32_t m;
1089 int e;
1090
1091 if (x == 0e0f ) return 0x00000000U;
1092 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
1093 if (x < -3.40282346638528860e+38f) return 0xff800000U;
1094 if (x != x ) return 0x7fbfffffU;
1095
1096 m = frexpf (x, &e) * 0x1000000U;
1097
1098 r = m & 0x80000000U;
1099
1100 if (r)
1101 m = -m;
1102
1103 if (e <= -126)
1104 {
1105 m &= 0xffffffU;
1106 m >>= (-125 - e);
1107 e = -126;
1108 }
1109
1110 r |= (e + 126) << 23;
1111 r |= m & 0x7fffffU;
1112 #endif
1113
1114 return r;
1115 }
1116
1117 /* converts an ieee single/binary32 to a float */
1118 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
1119 ecb_function_ float
1120 ecb_binary32_to_float (uint32_t x)
1121 {
1122 float r;
1123
1124 #if ECB_STDFP
1125 memcpy (&r, &x, 4);
1126 #else
1127 /* emulation, only works for normals and subnormals and +0 */
1128 int neg = x >> 31;
1129 int e = (x >> 23) & 0xffU;
1130
1131 x &= 0x7fffffU;
1132
1133 if (e)
1134 x |= 0x800000U;
1135 else
1136 e = 1;
1137
1138 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
1139 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
1140
1141 r = neg ? -r : r;
1142 #endif
1143
1144 return r;
1145 }
1146
1147 /* convert a double to ieee double/binary64 */
1148 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
1149 ecb_function_ uint64_t
1150 ecb_double_to_binary64 (double x)
1151 {
1152 uint64_t r;
1153
1154 #if ECB_STDFP
1155 memcpy (&r, &x, 8);
1156 #else
1157 /* slow emulation, works for anything but -0 */
1158 uint64_t m;
1159 int e;
1160
1161 if (x == 0e0 ) return 0x0000000000000000U;
1162 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
1163 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
1164 if (x != x ) return 0X7ff7ffffffffffffU;
1165
1166 m = frexp (x, &e) * 0x20000000000000U;
1167
1168 r = m & 0x8000000000000000;;
1169
1170 if (r)
1171 m = -m;
1172
1173 if (e <= -1022)
1174 {
1175 m &= 0x1fffffffffffffU;
1176 m >>= (-1021 - e);
1177 e = -1022;
1178 }
1179
1180 r |= ((uint64_t)(e + 1022)) << 52;
1181 r |= m & 0xfffffffffffffU;
1182 #endif
1183
1184 return r;
1185 }
1186
1187 /* converts an ieee double/binary64 to a double */
1188 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
1189 ecb_function_ double
1190 ecb_binary64_to_double (uint64_t x)
1191 {
1192 double r;
1193
1194 #if ECB_STDFP
1195 memcpy (&r, &x, 8);
1196 #else
1197 /* emulation, only works for normals and subnormals and +0 */
1198 int neg = x >> 63;
1199 int e = (x >> 52) & 0x7ffU;
1200
1201 x &= 0xfffffffffffffU;
1202
1203 if (e)
1204 x |= 0x10000000000000U;
1205 else
1206 e = 1;
1207
1208 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
1209 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
1210
1211 r = neg ? -r : r;
1212 #endif
1213
1214 return r;
1215 }
1216
1217#endif
1218
1219#endif
1220
1221/* ECB.H END */
1222
1223#if ECB_MEMORY_FENCE_NEEDS_PTHREADS
1224/* if your architecture doesn't need memory fences, e.g. because it is
1225 * single-cpu/core, or if you use libev in a project that doesn't use libev
1226 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
1227 * libev, in which cases the memory fences become nops.
1228 * alternatively, you can remove this #error and link against libpthread,
1229 * which will then provide the memory fences.
1230 */
1231# error "memory fences not defined for your architecture, please report"
1232#endif
1233
1234#ifndef ECB_MEMORY_FENCE
1235# define ECB_MEMORY_FENCE do { } while (0)
1236# define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
1237# define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
1238#endif
1239
1240#define expect_false(cond) ecb_expect_false (cond)
1241#define expect_true(cond) ecb_expect_true (cond)
1242#define noinline ecb_noinline
1243
1244#define inline_size ecb_inline
1245
1246#if EV_FEATURE_CODE
1247# define inline_speed ecb_inline
1248#else
1249# define inline_speed static noinline
1250#endif
1251
1252#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
1253
1254#if EV_MINPRI == EV_MAXPRI
1255# define ABSPRI(w) (((W)w), 0)
1256#else
1257# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
1258#endif
1259
1260#define EMPTY /* required for microsofts broken pseudo-c compiler */
1261#define EMPTY2(a,b) /* used to suppress some warnings */
1262
1263typedef ev_watcher *W;
1264typedef ev_watcher_list *WL;
1265typedef ev_watcher_time *WT;
1266
1267#define ev_active(w) ((W)(w))->active
1268#define ev_at(w) ((WT)(w))->at
1269
1270#if EV_USE_REALTIME
1271/* sig_atomic_t is used to avoid per-thread variables or locking but still */
1272/* giving it a reasonably high chance of working on typical architectures */
1273static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
1274#endif
1275
1276#if EV_USE_MONOTONIC
1277static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
1278#endif
1279
1280#ifndef EV_FD_TO_WIN32_HANDLE
1281# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
1282#endif
1283#ifndef EV_WIN32_HANDLE_TO_FD
1284# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
1285#endif
1286#ifndef EV_WIN32_CLOSE_FD
1287# define EV_WIN32_CLOSE_FD(fd) close (fd)
1288#endif
1289
1290#ifdef _WIN32
1291# include "ev_win32.c"
1292#endif
1293
1294/*****************************************************************************/
1295
1296/* define a suitable floor function (only used by periodics atm) */
1297
1298#if EV_USE_FLOOR
1299# include <math.h>
1300# define ev_floor(v) floor (v)
1301#else
1302
1303#include <float.h>
1304
1305/* a floor() replacement function, should be independent of ev_tstamp type */
1306static ev_tstamp noinline
1307ev_floor (ev_tstamp v)
1308{
1309 /* the choice of shift factor is not terribly important */
1310#if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1311 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1312#else
1313 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1314#endif
1315
1316 /* argument too large for an unsigned long? */
1317 if (expect_false (v >= shift))
1318 {
1319 ev_tstamp f;
1320
1321 if (v == v - 1.)
1322 return v; /* very large number */
1323
1324 f = shift * ev_floor (v * (1. / shift));
1325 return f + ev_floor (v - f);
1326 }
1327
1328 /* special treatment for negative args? */
1329 if (expect_false (v < 0.))
1330 {
1331 ev_tstamp f = -ev_floor (-v);
1332
1333 return f - (f == v ? 0 : 1);
1334 }
1335
1336 /* fits into an unsigned long */
1337 return (unsigned long)v;
1338}
1339
1340#endif
1341
1342/*****************************************************************************/
1343
1344#ifdef __linux
1345# include <sys/utsname.h>
1346#endif
1347
1348static unsigned int noinline ecb_cold
1349ev_linux_version (void)
1350{
1351#ifdef __linux
1352 unsigned int v = 0;
1353 struct utsname buf;
1354 int i;
1355 char *p = buf.release;
1356
1357 if (uname (&buf))
1358 return 0;
1359
1360 for (i = 3+1; --i; )
1361 {
1362 unsigned int c = 0;
1363
1364 for (;;)
1365 {
1366 if (*p >= '0' && *p <= '9')
1367 c = c * 10 + *p++ - '0';
1368 else
1369 {
1370 p += *p == '.';
1371 break;
1372 }
1373 }
1374
1375 v = (v << 8) | c;
1376 }
1377
1378 return v;
1379#else
1380 return 0;
1381#endif
1382}
1383
1384/*****************************************************************************/
1385
1386#if EV_AVOID_STDIO
1387static void noinline ecb_cold
1388ev_printerr (const char *msg)
1389{
1390 write (STDERR_FILENO, msg, strlen (msg));
1391}
1392#endif
1393
1394static void (*syserr_cb)(const char *msg) EV_THROW;
1395
1396void ecb_cold
1397ev_set_syserr_cb (void (*cb)(const char *msg) EV_THROW) EV_THROW
1398{
1399 syserr_cb = cb;
1400}
1401
1402static void noinline ecb_cold
1403ev_syserr (const char *msg)
1404{
1405 if (!msg)
1406 msg = "(libev) system error";
1407
1408 if (syserr_cb)
1409 syserr_cb (msg);
1410 else
1411 {
1412#if EV_AVOID_STDIO
1413 ev_printerr (msg);
1414 ev_printerr (": ");
1415 ev_printerr (strerror (errno));
1416 ev_printerr ("\n");
1417#else
1418 perror (msg);
1419#endif
1420 abort ();
1421 }
1422}
1423
1424static void *
1425ev_realloc_emul (void *ptr, long size) EV_THROW
1426{
1427 /* some systems, notably openbsd and darwin, fail to properly
1428 * implement realloc (x, 0) (as required by both ansi c-89 and
1429 * the single unix specification, so work around them here.
1430 * recently, also (at least) fedora and debian started breaking it,
1431 * despite documenting it otherwise.
1432 */
1433
1434 if (size)
1435 return realloc (ptr, size);
1436
1437 free (ptr);
1438 return 0;
1439}
1440
1441static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1442
1443void ecb_cold
1444ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
1445{
1446 alloc = cb;
1447}
1448
1449inline_speed void *
1450ev_realloc (void *ptr, long size)
1451{
1452 ptr = alloc (ptr, size);
1453
1454 if (!ptr && size)
1455 {
1456#if EV_AVOID_STDIO
1457 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1458#else
1459 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1460#endif
1461 abort ();
1462 }
1463
1464 return ptr;
1465}
1466
1467#define ev_malloc(size) ev_realloc (0, (size))
1468#define ev_free(ptr) ev_realloc ((ptr), 0)
1469
1470/*****************************************************************************/
1471
1472/* set in reify when reification needed */
1473#define EV_ANFD_REIFY 1
1474
1475/* file descriptor info structure */
1476typedef struct
1477{
1478 WL head;
1479 unsigned char events; /* the events watched for */
1480 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1481 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1482 unsigned char unused;
1483#if EV_USE_EPOLL
1484 unsigned int egen; /* generation counter to counter epoll bugs */
1485#endif
1486#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1487 SOCKET handle;
1488#endif
1489#if EV_USE_IOCP
1490 OVERLAPPED or, ow;
1491#endif
1492} ANFD;
1493
1494/* stores the pending event set for a given watcher */
1495typedef struct
1496{
1497 W w;
1498 int events; /* the pending event set for the given watcher */
1499} ANPENDING;
1500
1501#if EV_USE_INOTIFY
1502/* hash table entry per inotify-id */
1503typedef struct
1504{
1505 WL head;
1506} ANFS;
1507#endif
1508
1509/* Heap Entry */
1510#if EV_HEAP_CACHE_AT
1511 /* a heap element */
1512 typedef struct {
1513 ev_tstamp at;
1514 WT w;
1515 } ANHE;
1516
1517 #define ANHE_w(he) (he).w /* access watcher, read-write */
1518 #define ANHE_at(he) (he).at /* access cached at, read-only */
1519 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1520#else
1521 /* a heap element */
1522 typedef WT ANHE;
1523
1524 #define ANHE_w(he) (he)
1525 #define ANHE_at(he) (he)->at
1526 #define ANHE_at_cache(he)
1527#endif
1528
1529#if EV_MULTIPLICITY
1530
1531 struct ev_loop
1532 {
1533 ev_tstamp ev_rt_now;
1534 #define ev_rt_now ((loop)->ev_rt_now)
1535 #define VAR(name,decl) decl;
1536 #include "ev_vars.h"
1537 #undef VAR
1538 };
1539 #include "ev_wrap.h"
1540
1541 static struct ev_loop default_loop_struct;
1542 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1543
1544#else
1545
1546 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1547 #define VAR(name,decl) static decl;
1548 #include "ev_vars.h"
1549 #undef VAR
1550
1551 static int ev_default_loop_ptr;
1552
1553#endif
1554
1555#if EV_FEATURE_API
1556# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1557# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1558# define EV_INVOKE_PENDING invoke_cb (EV_A)
1559#else
1560# define EV_RELEASE_CB (void)0
1561# define EV_ACQUIRE_CB (void)0
1562# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1563#endif
1564
1565#define EVBREAK_RECURSE 0x80
1566
1567/*****************************************************************************/
1568
1569#ifndef EV_HAVE_EV_TIME
55ev_tstamp 1570ev_tstamp
56ev_time (void) 1571ev_time (void) EV_THROW
57{ 1572{
58#if HAVE_REALTIME 1573#if EV_USE_REALTIME
1574 if (expect_true (have_realtime))
1575 {
59 struct timespec ts; 1576 struct timespec ts;
60 clock_gettime (CLOCK_REALTIME, &ts); 1577 clock_gettime (CLOCK_REALTIME, &ts);
61 return ts.tv_sec + ts.tv_nsec * 1e-9; 1578 return ts.tv_sec + ts.tv_nsec * 1e-9;
62#else 1579 }
1580#endif
1581
63 struct timeval tv; 1582 struct timeval tv;
64 gettimeofday (&tv, 0); 1583 gettimeofday (&tv, 0);
65 return tv.tv_sec + tv.tv_usec * 1e-6; 1584 return tv.tv_sec + tv.tv_usec * 1e-6;
66#endif
67} 1585}
1586#endif
68 1587
69static ev_tstamp 1588inline_size ev_tstamp
70get_clock (void) 1589get_clock (void)
71{ 1590{
72#if HAVE_MONOTONIC 1591#if EV_USE_MONOTONIC
73 if (have_monotonic) 1592 if (expect_true (have_monotonic))
74 { 1593 {
75 struct timespec ts; 1594 struct timespec ts;
76 clock_gettime (CLOCK_MONOTONIC, &ts); 1595 clock_gettime (CLOCK_MONOTONIC, &ts);
77 return ts.tv_sec + ts.tv_nsec * 1e-9; 1596 return ts.tv_sec + ts.tv_nsec * 1e-9;
78 } 1597 }
79#endif 1598#endif
80 1599
81 return ev_time (); 1600 return ev_time ();
82} 1601}
83 1602
84#define array_needsize(base,cur,cnt,init) \ 1603#if EV_MULTIPLICITY
85 if ((cnt) > cur) \ 1604ev_tstamp
86 { \ 1605ev_now (EV_P) EV_THROW
87 int newcnt = cur ? cur << 1 : 16; \ 1606{
88 fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ 1607 return ev_rt_now;
89 base = realloc (base, sizeof (*base) * (newcnt)); \ 1608}
90 init (base + cur, newcnt - cur); \ 1609#endif
91 cur = newcnt; \ 1610
1611void
1612ev_sleep (ev_tstamp delay) EV_THROW
1613{
1614 if (delay > 0.)
92 } 1615 {
1616#if EV_USE_NANOSLEEP
1617 struct timespec ts;
1618
1619 EV_TS_SET (ts, delay);
1620 nanosleep (&ts, 0);
1621#elif defined _WIN32
1622 Sleep ((unsigned long)(delay * 1e3));
1623#else
1624 struct timeval tv;
1625
1626 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1627 /* something not guaranteed by newer posix versions, but guaranteed */
1628 /* by older ones */
1629 EV_TV_SET (tv, delay);
1630 select (0, 0, 0, 0, &tv);
1631#endif
1632 }
1633}
93 1634
94/*****************************************************************************/ 1635/*****************************************************************************/
95 1636
96typedef struct 1637#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
97{
98 struct ev_io *head;
99 unsigned char wev, rev; /* want, received event set */
100} ANFD;
101 1638
102static ANFD *anfds; 1639/* find a suitable new size for the given array, */
103static int anfdmax; 1640/* hopefully by rounding to a nice-to-malloc size */
104 1641inline_size int
105static int *fdchanges; 1642array_nextsize (int elem, int cur, int cnt)
106static int fdchangemax, fdchangecnt;
107
108static void
109anfds_init (ANFD *base, int count)
110{ 1643{
111 while (count--) 1644 int ncur = cur + 1;
112 { 1645
113 base->head = 0; 1646 do
114 base->wev = base->rev = EV_NONE; 1647 ncur <<= 1;
115 ++base; 1648 while (cnt > ncur);
1649
1650 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1651 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
116 } 1652 {
117} 1653 ncur *= elem;
1654 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1655 ncur = ncur - sizeof (void *) * 4;
1656 ncur /= elem;
1657 }
118 1658
119typedef struct 1659 return ncur;
120{ 1660}
121 W w;
122 int events;
123} ANPENDING;
124 1661
125static ANPENDING *pendings; 1662static void * noinline ecb_cold
126static int pendingmax, pendingcnt; 1663array_realloc (int elem, void *base, int *cur, int cnt)
127
128static void
129event (W w, int events)
130{ 1664{
131 w->pending = ++pendingcnt; 1665 *cur = array_nextsize (elem, *cur, cnt);
132 array_needsize (pendings, pendingmax, pendingcnt, ); 1666 return ev_realloc (base, elem * *cur);
133 pendings [pendingcnt - 1].w = w; 1667}
1668
1669#define array_init_zero(base,count) \
1670 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1671
1672#define array_needsize(type,base,cur,cnt,init) \
1673 if (expect_false ((cnt) > (cur))) \
1674 { \
1675 int ecb_unused ocur_ = (cur); \
1676 (base) = (type *)array_realloc \
1677 (sizeof (type), (base), &(cur), (cnt)); \
1678 init ((base) + (ocur_), (cur) - ocur_); \
1679 }
1680
1681#if 0
1682#define array_slim(type,stem) \
1683 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1684 { \
1685 stem ## max = array_roundsize (stem ## cnt >> 1); \
1686 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1687 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1688 }
1689#endif
1690
1691#define array_free(stem, idx) \
1692 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1693
1694/*****************************************************************************/
1695
1696/* dummy callback for pending events */
1697static void noinline
1698pendingcb (EV_P_ ev_prepare *w, int revents)
1699{
1700}
1701
1702void noinline
1703ev_feed_event (EV_P_ void *w, int revents) EV_THROW
1704{
1705 W w_ = (W)w;
1706 int pri = ABSPRI (w_);
1707
1708 if (expect_false (w_->pending))
134 pendings [pendingcnt - 1].events = events; 1709 pendings [pri][w_->pending - 1].events |= revents;
135} 1710 else
1711 {
1712 w_->pending = ++pendingcnt [pri];
1713 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1714 pendings [pri][w_->pending - 1].w = w_;
1715 pendings [pri][w_->pending - 1].events = revents;
1716 }
136 1717
137static void 1718 pendingpri = NUMPRI - 1;
1719}
1720
1721inline_speed void
1722feed_reverse (EV_P_ W w)
1723{
1724 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1725 rfeeds [rfeedcnt++] = w;
1726}
1727
1728inline_size void
1729feed_reverse_done (EV_P_ int revents)
1730{
1731 do
1732 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1733 while (rfeedcnt);
1734}
1735
1736inline_speed void
1737queue_events (EV_P_ W *events, int eventcnt, int type)
1738{
1739 int i;
1740
1741 for (i = 0; i < eventcnt; ++i)
1742 ev_feed_event (EV_A_ events [i], type);
1743}
1744
1745/*****************************************************************************/
1746
1747inline_speed void
138fd_event (int fd, int events) 1748fd_event_nocheck (EV_P_ int fd, int revents)
139{ 1749{
140 ANFD *anfd = anfds + fd; 1750 ANFD *anfd = anfds + fd;
141 struct ev_io *w; 1751 ev_io *w;
142 1752
143 for (w = anfd->head; w; w = w->next) 1753 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
144 { 1754 {
145 int ev = w->events & events; 1755 int ev = w->events & revents;
146 1756
147 if (ev) 1757 if (ev)
148 event ((W)w, ev); 1758 ev_feed_event (EV_A_ (W)w, ev);
149 } 1759 }
150} 1760}
151 1761
152static void 1762/* do not submit kernel events for fds that have reify set */
153queue_events (W *events, int eventcnt, int type) 1763/* because that means they changed while we were polling for new events */
1764inline_speed void
1765fd_event (EV_P_ int fd, int revents)
1766{
1767 ANFD *anfd = anfds + fd;
1768
1769 if (expect_true (!anfd->reify))
1770 fd_event_nocheck (EV_A_ fd, revents);
1771}
1772
1773void
1774ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
1775{
1776 if (fd >= 0 && fd < anfdmax)
1777 fd_event_nocheck (EV_A_ fd, revents);
1778}
1779
1780/* make sure the external fd watch events are in-sync */
1781/* with the kernel/libev internal state */
1782inline_size void
1783fd_reify (EV_P)
154{ 1784{
155 int i; 1785 int i;
156 1786
157 for (i = 0; i < eventcnt; ++i) 1787#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
158 event (events [i], type);
159}
160
161/*****************************************************************************/
162
163static struct ev_timer **timers;
164static int timermax, timercnt;
165
166static struct ev_periodic **periodics;
167static int periodicmax, periodiccnt;
168
169static void
170upheap (WT *timers, int k)
171{
172 WT w = timers [k];
173
174 while (k && timers [k >> 1]->at > w->at)
175 {
176 timers [k] = timers [k >> 1];
177 timers [k]->active = k + 1;
178 k >>= 1;
179 }
180
181 timers [k] = w;
182 timers [k]->active = k + 1;
183
184}
185
186static void
187downheap (WT *timers, int N, int k)
188{
189 WT w = timers [k];
190
191 while (k < (N >> 1))
192 {
193 int j = k << 1;
194
195 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
196 ++j;
197
198 if (w->at <= timers [j]->at)
199 break;
200
201 timers [k] = timers [j];
202 timers [k]->active = k + 1;
203 k = j;
204 }
205
206 timers [k] = w;
207 timers [k]->active = k + 1;
208}
209
210/*****************************************************************************/
211
212typedef struct
213{
214 struct ev_signal *head;
215 sig_atomic_t gotsig;
216} ANSIG;
217
218static ANSIG *signals;
219static int signalmax;
220
221static int sigpipe [2];
222static sig_atomic_t gotsig;
223static struct ev_io sigev;
224
225static void
226signals_init (ANSIG *base, int count)
227{
228 while (count--)
229 {
230 base->head = 0;
231 base->gotsig = 0;
232 ++base;
233 }
234}
235
236static void
237sighandler (int signum)
238{
239 signals [signum - 1].gotsig = 1;
240
241 if (!gotsig)
242 {
243 gotsig = 1;
244 write (sigpipe [1], &gotsig, 1);
245 }
246}
247
248static void
249sigcb (struct ev_io *iow, int revents)
250{
251 struct ev_signal *w;
252 int sig;
253
254 gotsig = 0;
255 read (sigpipe [0], &revents, 1);
256
257 for (sig = signalmax; sig--; )
258 if (signals [sig].gotsig)
259 {
260 signals [sig].gotsig = 0;
261
262 for (w = signals [sig].head; w; w = w->next)
263 event ((W)w, EV_SIGNAL);
264 }
265}
266
267static void
268siginit (void)
269{
270 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
271 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
272
273 /* rather than sort out wether we really need nb, set it */
274 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
275 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
276
277 evio_set (&sigev, sigpipe [0], EV_READ);
278 evio_start (&sigev);
279}
280
281/*****************************************************************************/
282
283static struct ev_idle **idles;
284static int idlemax, idlecnt;
285
286static struct ev_check **checks;
287static int checkmax, checkcnt;
288
289/*****************************************************************************/
290
291#if HAVE_EPOLL
292# include "ev_epoll.c"
293#endif
294#if HAVE_SELECT
295# include "ev_select.c"
296#endif
297
298int ev_init (int flags)
299{
300#if HAVE_MONOTONIC
301 {
302 struct timespec ts;
303 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
304 have_monotonic = 1;
305 }
306#endif
307
308 ev_now = ev_time ();
309 now = get_clock ();
310 diff = ev_now - now;
311
312 if (pipe (sigpipe))
313 return 0;
314
315 ev_method = EVMETHOD_NONE;
316#if HAVE_EPOLL
317 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
318#endif
319#if HAVE_SELECT
320 if (ev_method == EVMETHOD_NONE) select_init (flags);
321#endif
322
323 if (ev_method)
324 {
325 evw_init (&sigev, sigcb);
326 siginit ();
327 }
328
329 return ev_method;
330}
331
332/*****************************************************************************/
333
334void ev_prefork (void)
335{
336 /* nop */
337}
338
339void ev_postfork_parent (void)
340{
341 /* nop */
342}
343
344void ev_postfork_child (void)
345{
346#if HAVE_EPOLL
347 if (ev_method == EVMETHOD_EPOLL)
348 epoll_postfork_child ();
349#endif
350
351 evio_stop (&sigev);
352 close (sigpipe [0]);
353 close (sigpipe [1]);
354 pipe (sigpipe);
355 siginit ();
356}
357
358/*****************************************************************************/
359
360static void
361fd_reify (void)
362{
363 int i;
364
365 for (i = 0; i < fdchangecnt; ++i) 1788 for (i = 0; i < fdchangecnt; ++i)
366 { 1789 {
367 int fd = fdchanges [i]; 1790 int fd = fdchanges [i];
368 ANFD *anfd = anfds + fd; 1791 ANFD *anfd = anfds + fd;
369 struct ev_io *w;
370 1792
371 int wev = 0; 1793 if (anfd->reify & EV__IOFDSET && anfd->head)
372
373 for (w = anfd->head; w; w = w->next)
374 wev |= w->events;
375
376 if (anfd->wev != wev)
377 { 1794 {
378 method_modify (fd, anfd->wev, wev); 1795 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1796
1797 if (handle != anfd->handle)
1798 {
1799 unsigned long arg;
1800
1801 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1802
1803 /* handle changed, but fd didn't - we need to do it in two steps */
1804 backend_modify (EV_A_ fd, anfd->events, 0);
379 anfd->wev = wev; 1805 anfd->events = 0;
1806 anfd->handle = handle;
1807 }
380 } 1808 }
381 } 1809 }
1810#endif
1811
1812 for (i = 0; i < fdchangecnt; ++i)
1813 {
1814 int fd = fdchanges [i];
1815 ANFD *anfd = anfds + fd;
1816 ev_io *w;
1817
1818 unsigned char o_events = anfd->events;
1819 unsigned char o_reify = anfd->reify;
1820
1821 anfd->reify = 0;
1822
1823 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1824 {
1825 anfd->events = 0;
1826
1827 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1828 anfd->events |= (unsigned char)w->events;
1829
1830 if (o_events != anfd->events)
1831 o_reify = EV__IOFDSET; /* actually |= */
1832 }
1833
1834 if (o_reify & EV__IOFDSET)
1835 backend_modify (EV_A_ fd, o_events, anfd->events);
1836 }
382 1837
383 fdchangecnt = 0; 1838 fdchangecnt = 0;
384} 1839}
385 1840
1841/* something about the given fd changed */
1842inline_size void
1843fd_change (EV_P_ int fd, int flags)
1844{
1845 unsigned char reify = anfds [fd].reify;
1846 anfds [fd].reify |= flags;
1847
1848 if (expect_true (!reify))
1849 {
1850 ++fdchangecnt;
1851 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1852 fdchanges [fdchangecnt - 1] = fd;
1853 }
1854}
1855
1856/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1857inline_speed void ecb_cold
1858fd_kill (EV_P_ int fd)
1859{
1860 ev_io *w;
1861
1862 while ((w = (ev_io *)anfds [fd].head))
1863 {
1864 ev_io_stop (EV_A_ w);
1865 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1866 }
1867}
1868
1869/* check whether the given fd is actually valid, for error recovery */
1870inline_size int ecb_cold
1871fd_valid (int fd)
1872{
1873#ifdef _WIN32
1874 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1875#else
1876 return fcntl (fd, F_GETFD) != -1;
1877#endif
1878}
1879
1880/* called on EBADF to verify fds */
1881static void noinline ecb_cold
1882fd_ebadf (EV_P)
1883{
1884 int fd;
1885
1886 for (fd = 0; fd < anfdmax; ++fd)
1887 if (anfds [fd].events)
1888 if (!fd_valid (fd) && errno == EBADF)
1889 fd_kill (EV_A_ fd);
1890}
1891
1892/* called on ENOMEM in select/poll to kill some fds and retry */
1893static void noinline ecb_cold
1894fd_enomem (EV_P)
1895{
1896 int fd;
1897
1898 for (fd = anfdmax; fd--; )
1899 if (anfds [fd].events)
1900 {
1901 fd_kill (EV_A_ fd);
1902 break;
1903 }
1904}
1905
1906/* usually called after fork if backend needs to re-arm all fds from scratch */
1907static void noinline
1908fd_rearm_all (EV_P)
1909{
1910 int fd;
1911
1912 for (fd = 0; fd < anfdmax; ++fd)
1913 if (anfds [fd].events)
1914 {
1915 anfds [fd].events = 0;
1916 anfds [fd].emask = 0;
1917 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1918 }
1919}
1920
1921/* used to prepare libev internal fd's */
1922/* this is not fork-safe */
1923inline_speed void
1924fd_intern (int fd)
1925{
1926#ifdef _WIN32
1927 unsigned long arg = 1;
1928 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1929#else
1930 fcntl (fd, F_SETFD, FD_CLOEXEC);
1931 fcntl (fd, F_SETFL, O_NONBLOCK);
1932#endif
1933}
1934
1935/*****************************************************************************/
1936
1937/*
1938 * the heap functions want a real array index. array index 0 is guaranteed to not
1939 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1940 * the branching factor of the d-tree.
1941 */
1942
1943/*
1944 * at the moment we allow libev the luxury of two heaps,
1945 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1946 * which is more cache-efficient.
1947 * the difference is about 5% with 50000+ watchers.
1948 */
1949#if EV_USE_4HEAP
1950
1951#define DHEAP 4
1952#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1953#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1954#define UPHEAP_DONE(p,k) ((p) == (k))
1955
1956/* away from the root */
1957inline_speed void
1958downheap (ANHE *heap, int N, int k)
1959{
1960 ANHE he = heap [k];
1961 ANHE *E = heap + N + HEAP0;
1962
1963 for (;;)
1964 {
1965 ev_tstamp minat;
1966 ANHE *minpos;
1967 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1968
1969 /* find minimum child */
1970 if (expect_true (pos + DHEAP - 1 < E))
1971 {
1972 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1973 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1974 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1975 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1976 }
1977 else if (pos < E)
1978 {
1979 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1980 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1981 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1982 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1983 }
1984 else
1985 break;
1986
1987 if (ANHE_at (he) <= minat)
1988 break;
1989
1990 heap [k] = *minpos;
1991 ev_active (ANHE_w (*minpos)) = k;
1992
1993 k = minpos - heap;
1994 }
1995
1996 heap [k] = he;
1997 ev_active (ANHE_w (he)) = k;
1998}
1999
2000#else /* 4HEAP */
2001
2002#define HEAP0 1
2003#define HPARENT(k) ((k) >> 1)
2004#define UPHEAP_DONE(p,k) (!(p))
2005
2006/* away from the root */
2007inline_speed void
2008downheap (ANHE *heap, int N, int k)
2009{
2010 ANHE he = heap [k];
2011
2012 for (;;)
2013 {
2014 int c = k << 1;
2015
2016 if (c >= N + HEAP0)
2017 break;
2018
2019 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
2020 ? 1 : 0;
2021
2022 if (ANHE_at (he) <= ANHE_at (heap [c]))
2023 break;
2024
2025 heap [k] = heap [c];
2026 ev_active (ANHE_w (heap [k])) = k;
2027
2028 k = c;
2029 }
2030
2031 heap [k] = he;
2032 ev_active (ANHE_w (he)) = k;
2033}
2034#endif
2035
2036/* towards the root */
2037inline_speed void
2038upheap (ANHE *heap, int k)
2039{
2040 ANHE he = heap [k];
2041
2042 for (;;)
2043 {
2044 int p = HPARENT (k);
2045
2046 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
2047 break;
2048
2049 heap [k] = heap [p];
2050 ev_active (ANHE_w (heap [k])) = k;
2051 k = p;
2052 }
2053
2054 heap [k] = he;
2055 ev_active (ANHE_w (he)) = k;
2056}
2057
2058/* move an element suitably so it is in a correct place */
2059inline_size void
2060adjustheap (ANHE *heap, int N, int k)
2061{
2062 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
2063 upheap (heap, k);
2064 else
2065 downheap (heap, N, k);
2066}
2067
2068/* rebuild the heap: this function is used only once and executed rarely */
2069inline_size void
2070reheap (ANHE *heap, int N)
2071{
2072 int i;
2073
2074 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
2075 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
2076 for (i = 0; i < N; ++i)
2077 upheap (heap, i + HEAP0);
2078}
2079
2080/*****************************************************************************/
2081
2082/* associate signal watchers to a signal signal */
2083typedef struct
2084{
2085 EV_ATOMIC_T pending;
2086#if EV_MULTIPLICITY
2087 EV_P;
2088#endif
2089 WL head;
2090} ANSIG;
2091
2092static ANSIG signals [EV_NSIG - 1];
2093
2094/*****************************************************************************/
2095
2096#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2097
2098static void noinline ecb_cold
2099evpipe_init (EV_P)
2100{
2101 if (!ev_is_active (&pipe_w))
2102 {
2103 int fds [2];
2104
2105# if EV_USE_EVENTFD
2106 fds [0] = -1;
2107 fds [1] = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
2108 if (fds [1] < 0 && errno == EINVAL)
2109 fds [1] = eventfd (0, 0);
2110
2111 if (fds [1] < 0)
2112# endif
2113 {
2114 while (pipe (fds))
2115 ev_syserr ("(libev) error creating signal/async pipe");
2116
2117 fd_intern (fds [0]);
2118 }
2119
2120 evpipe [0] = fds [0];
2121
2122 if (evpipe [1] < 0)
2123 evpipe [1] = fds [1]; /* first call, set write fd */
2124 else
2125 {
2126 /* on subsequent calls, do not change evpipe [1] */
2127 /* so that evpipe_write can always rely on its value. */
2128 /* this branch does not do anything sensible on windows, */
2129 /* so must not be executed on windows */
2130
2131 dup2 (fds [1], evpipe [1]);
2132 close (fds [1]);
2133 }
2134
2135 fd_intern (evpipe [1]);
2136
2137 ev_io_set (&pipe_w, evpipe [0] < 0 ? evpipe [1] : evpipe [0], EV_READ);
2138 ev_io_start (EV_A_ &pipe_w);
2139 ev_unref (EV_A); /* watcher should not keep loop alive */
2140 }
2141}
2142
2143inline_speed void
2144evpipe_write (EV_P_ EV_ATOMIC_T *flag)
2145{
2146 ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
2147
2148 if (expect_true (*flag))
2149 return;
2150
2151 *flag = 1;
2152 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
2153
2154 pipe_write_skipped = 1;
2155
2156 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
2157
2158 if (pipe_write_wanted)
2159 {
2160 int old_errno;
2161
2162 pipe_write_skipped = 0;
2163 ECB_MEMORY_FENCE_RELEASE;
2164
2165 old_errno = errno; /* save errno because write will clobber it */
2166
2167#if EV_USE_EVENTFD
2168 if (evpipe [0] < 0)
2169 {
2170 uint64_t counter = 1;
2171 write (evpipe [1], &counter, sizeof (uint64_t));
2172 }
2173 else
2174#endif
2175 {
2176#ifdef _WIN32
2177 WSABUF buf;
2178 DWORD sent;
2179 buf.buf = &buf;
2180 buf.len = 1;
2181 WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
2182#else
2183 write (evpipe [1], &(evpipe [1]), 1);
2184#endif
2185 }
2186
2187 errno = old_errno;
2188 }
2189}
2190
2191/* called whenever the libev signal pipe */
2192/* got some events (signal, async) */
386static void 2193static void
387call_pending () 2194pipecb (EV_P_ ev_io *iow, int revents)
388{ 2195{
389 int i; 2196 int i;
390 2197
391 for (i = 0; i < pendingcnt; ++i) 2198 if (revents & EV_READ)
392 { 2199 {
393 ANPENDING *p = pendings + i; 2200#if EV_USE_EVENTFD
394 2201 if (evpipe [0] < 0)
395 if (p->w)
396 { 2202 {
2203 uint64_t counter;
2204 read (evpipe [1], &counter, sizeof (uint64_t));
2205 }
2206 else
2207#endif
2208 {
2209 char dummy[4];
2210#ifdef _WIN32
2211 WSABUF buf;
2212 DWORD recvd;
2213 DWORD flags = 0;
2214 buf.buf = dummy;
2215 buf.len = sizeof (dummy);
2216 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
2217#else
2218 read (evpipe [0], &dummy, sizeof (dummy));
2219#endif
2220 }
2221 }
2222
2223 pipe_write_skipped = 0;
2224
2225 ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
2226
2227#if EV_SIGNAL_ENABLE
2228 if (sig_pending)
2229 {
2230 sig_pending = 0;
2231
2232 ECB_MEMORY_FENCE;
2233
2234 for (i = EV_NSIG - 1; i--; )
2235 if (expect_false (signals [i].pending))
2236 ev_feed_signal_event (EV_A_ i + 1);
2237 }
2238#endif
2239
2240#if EV_ASYNC_ENABLE
2241 if (async_pending)
2242 {
2243 async_pending = 0;
2244
2245 ECB_MEMORY_FENCE;
2246
2247 for (i = asynccnt; i--; )
2248 if (asyncs [i]->sent)
2249 {
2250 asyncs [i]->sent = 0;
2251 ECB_MEMORY_FENCE_RELEASE;
2252 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
2253 }
2254 }
2255#endif
2256}
2257
2258/*****************************************************************************/
2259
2260void
2261ev_feed_signal (int signum) EV_THROW
2262{
2263#if EV_MULTIPLICITY
2264 EV_P;
2265 ECB_MEMORY_FENCE_ACQUIRE;
2266 EV_A = signals [signum - 1].loop;
2267
2268 if (!EV_A)
2269 return;
2270#endif
2271
2272 signals [signum - 1].pending = 1;
2273 evpipe_write (EV_A_ &sig_pending);
2274}
2275
2276static void
2277ev_sighandler (int signum)
2278{
2279#ifdef _WIN32
2280 signal (signum, ev_sighandler);
2281#endif
2282
2283 ev_feed_signal (signum);
2284}
2285
2286void noinline
2287ev_feed_signal_event (EV_P_ int signum) EV_THROW
2288{
2289 WL w;
2290
2291 if (expect_false (signum <= 0 || signum >= EV_NSIG))
2292 return;
2293
2294 --signum;
2295
2296#if EV_MULTIPLICITY
2297 /* it is permissible to try to feed a signal to the wrong loop */
2298 /* or, likely more useful, feeding a signal nobody is waiting for */
2299
2300 if (expect_false (signals [signum].loop != EV_A))
2301 return;
2302#endif
2303
2304 signals [signum].pending = 0;
2305 ECB_MEMORY_FENCE_RELEASE;
2306
2307 for (w = signals [signum].head; w; w = w->next)
2308 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2309}
2310
2311#if EV_USE_SIGNALFD
2312static void
2313sigfdcb (EV_P_ ev_io *iow, int revents)
2314{
2315 struct signalfd_siginfo si[2], *sip; /* these structs are big */
2316
2317 for (;;)
2318 {
2319 ssize_t res = read (sigfd, si, sizeof (si));
2320
2321 /* not ISO-C, as res might be -1, but works with SuS */
2322 for (sip = si; (char *)sip < (char *)si + res; ++sip)
2323 ev_feed_signal_event (EV_A_ sip->ssi_signo);
2324
2325 if (res < (ssize_t)sizeof (si))
2326 break;
2327 }
2328}
2329#endif
2330
2331#endif
2332
2333/*****************************************************************************/
2334
2335#if EV_CHILD_ENABLE
2336static WL childs [EV_PID_HASHSIZE];
2337
2338static ev_signal childev;
2339
2340#ifndef WIFCONTINUED
2341# define WIFCONTINUED(status) 0
2342#endif
2343
2344/* handle a single child status event */
2345inline_speed void
2346child_reap (EV_P_ int chain, int pid, int status)
2347{
2348 ev_child *w;
2349 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2350
2351 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2352 {
2353 if ((w->pid == pid || !w->pid)
2354 && (!traced || (w->flags & 1)))
2355 {
2356 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2357 w->rpid = pid;
2358 w->rstatus = status;
2359 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2360 }
2361 }
2362}
2363
2364#ifndef WCONTINUED
2365# define WCONTINUED 0
2366#endif
2367
2368/* called on sigchld etc., calls waitpid */
2369static void
2370childcb (EV_P_ ev_signal *sw, int revents)
2371{
2372 int pid, status;
2373
2374 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
2375 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
2376 if (!WCONTINUED
2377 || errno != EINVAL
2378 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2379 return;
2380
2381 /* make sure we are called again until all children have been reaped */
2382 /* we need to do it this way so that the callback gets called before we continue */
2383 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2384
2385 child_reap (EV_A_ pid, pid, status);
2386 if ((EV_PID_HASHSIZE) > 1)
2387 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2388}
2389
2390#endif
2391
2392/*****************************************************************************/
2393
2394#if EV_USE_IOCP
2395# include "ev_iocp.c"
2396#endif
2397#if EV_USE_PORT
2398# include "ev_port.c"
2399#endif
2400#if EV_USE_KQUEUE
2401# include "ev_kqueue.c"
2402#endif
2403#if EV_USE_EPOLL
2404# include "ev_epoll.c"
2405#endif
2406#if EV_USE_POLL
2407# include "ev_poll.c"
2408#endif
2409#if EV_USE_SELECT
2410# include "ev_select.c"
2411#endif
2412
2413int ecb_cold
2414ev_version_major (void) EV_THROW
2415{
2416 return EV_VERSION_MAJOR;
2417}
2418
2419int ecb_cold
2420ev_version_minor (void) EV_THROW
2421{
2422 return EV_VERSION_MINOR;
2423}
2424
2425/* return true if we are running with elevated privileges and should ignore env variables */
2426int inline_size ecb_cold
2427enable_secure (void)
2428{
2429#ifdef _WIN32
2430 return 0;
2431#else
2432 return getuid () != geteuid ()
2433 || getgid () != getegid ();
2434#endif
2435}
2436
2437unsigned int ecb_cold
2438ev_supported_backends (void) EV_THROW
2439{
2440 unsigned int flags = 0;
2441
2442 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2443 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2444 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2445 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2446 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2447
2448 return flags;
2449}
2450
2451unsigned int ecb_cold
2452ev_recommended_backends (void) EV_THROW
2453{
2454 unsigned int flags = ev_supported_backends ();
2455
2456#ifndef __NetBSD__
2457 /* kqueue is borked on everything but netbsd apparently */
2458 /* it usually doesn't work correctly on anything but sockets and pipes */
2459 flags &= ~EVBACKEND_KQUEUE;
2460#endif
2461#ifdef __APPLE__
2462 /* only select works correctly on that "unix-certified" platform */
2463 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2464 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2465#endif
2466#ifdef __FreeBSD__
2467 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2468#endif
2469
2470 return flags;
2471}
2472
2473unsigned int ecb_cold
2474ev_embeddable_backends (void) EV_THROW
2475{
2476 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2477
2478 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2479 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2480 flags &= ~EVBACKEND_EPOLL;
2481
2482 return flags;
2483}
2484
2485unsigned int
2486ev_backend (EV_P) EV_THROW
2487{
2488 return backend;
2489}
2490
2491#if EV_FEATURE_API
2492unsigned int
2493ev_iteration (EV_P) EV_THROW
2494{
2495 return loop_count;
2496}
2497
2498unsigned int
2499ev_depth (EV_P) EV_THROW
2500{
2501 return loop_depth;
2502}
2503
2504void
2505ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2506{
2507 io_blocktime = interval;
2508}
2509
2510void
2511ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2512{
2513 timeout_blocktime = interval;
2514}
2515
2516void
2517ev_set_userdata (EV_P_ void *data) EV_THROW
2518{
2519 userdata = data;
2520}
2521
2522void *
2523ev_userdata (EV_P) EV_THROW
2524{
2525 return userdata;
2526}
2527
2528void
2529ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) EV_THROW
2530{
2531 invoke_cb = invoke_pending_cb;
2532}
2533
2534void
2535ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
2536{
2537 release_cb = release;
2538 acquire_cb = acquire;
2539}
2540#endif
2541
2542/* initialise a loop structure, must be zero-initialised */
2543static void noinline ecb_cold
2544loop_init (EV_P_ unsigned int flags) EV_THROW
2545{
2546 if (!backend)
2547 {
2548 origflags = flags;
2549
2550#if EV_USE_REALTIME
2551 if (!have_realtime)
2552 {
2553 struct timespec ts;
2554
2555 if (!clock_gettime (CLOCK_REALTIME, &ts))
2556 have_realtime = 1;
2557 }
2558#endif
2559
2560#if EV_USE_MONOTONIC
2561 if (!have_monotonic)
2562 {
2563 struct timespec ts;
2564
2565 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2566 have_monotonic = 1;
2567 }
2568#endif
2569
2570 /* pid check not overridable via env */
2571#ifndef _WIN32
2572 if (flags & EVFLAG_FORKCHECK)
2573 curpid = getpid ();
2574#endif
2575
2576 if (!(flags & EVFLAG_NOENV)
2577 && !enable_secure ()
2578 && getenv ("LIBEV_FLAGS"))
2579 flags = atoi (getenv ("LIBEV_FLAGS"));
2580
2581 ev_rt_now = ev_time ();
2582 mn_now = get_clock ();
2583 now_floor = mn_now;
2584 rtmn_diff = ev_rt_now - mn_now;
2585#if EV_FEATURE_API
2586 invoke_cb = ev_invoke_pending;
2587#endif
2588
2589 io_blocktime = 0.;
2590 timeout_blocktime = 0.;
2591 backend = 0;
2592 backend_fd = -1;
2593 sig_pending = 0;
2594#if EV_ASYNC_ENABLE
2595 async_pending = 0;
2596#endif
2597 pipe_write_skipped = 0;
2598 pipe_write_wanted = 0;
2599 evpipe [0] = -1;
2600 evpipe [1] = -1;
2601#if EV_USE_INOTIFY
2602 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2603#endif
2604#if EV_USE_SIGNALFD
2605 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2606#endif
2607
2608 if (!(flags & EVBACKEND_MASK))
2609 flags |= ev_recommended_backends ();
2610
2611#if EV_USE_IOCP
2612 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2613#endif
2614#if EV_USE_PORT
2615 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2616#endif
2617#if EV_USE_KQUEUE
2618 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2619#endif
2620#if EV_USE_EPOLL
2621 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2622#endif
2623#if EV_USE_POLL
2624 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2625#endif
2626#if EV_USE_SELECT
2627 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2628#endif
2629
2630 ev_prepare_init (&pending_w, pendingcb);
2631
2632#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2633 ev_init (&pipe_w, pipecb);
2634 ev_set_priority (&pipe_w, EV_MAXPRI);
2635#endif
2636 }
2637}
2638
2639/* free up a loop structure */
2640void ecb_cold
2641ev_loop_destroy (EV_P)
2642{
2643 int i;
2644
2645#if EV_MULTIPLICITY
2646 /* mimic free (0) */
2647 if (!EV_A)
2648 return;
2649#endif
2650
2651#if EV_CLEANUP_ENABLE
2652 /* queue cleanup watchers (and execute them) */
2653 if (expect_false (cleanupcnt))
2654 {
2655 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2656 EV_INVOKE_PENDING;
2657 }
2658#endif
2659
2660#if EV_CHILD_ENABLE
2661 if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
2662 {
2663 ev_ref (EV_A); /* child watcher */
2664 ev_signal_stop (EV_A_ &childev);
2665 }
2666#endif
2667
2668 if (ev_is_active (&pipe_w))
2669 {
2670 /*ev_ref (EV_A);*/
2671 /*ev_io_stop (EV_A_ &pipe_w);*/
2672
2673 if (evpipe [0] >= 0) EV_WIN32_CLOSE_FD (evpipe [0]);
2674 if (evpipe [1] >= 0) EV_WIN32_CLOSE_FD (evpipe [1]);
2675 }
2676
2677#if EV_USE_SIGNALFD
2678 if (ev_is_active (&sigfd_w))
2679 close (sigfd);
2680#endif
2681
2682#if EV_USE_INOTIFY
2683 if (fs_fd >= 0)
2684 close (fs_fd);
2685#endif
2686
2687 if (backend_fd >= 0)
2688 close (backend_fd);
2689
2690#if EV_USE_IOCP
2691 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2692#endif
2693#if EV_USE_PORT
2694 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2695#endif
2696#if EV_USE_KQUEUE
2697 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2698#endif
2699#if EV_USE_EPOLL
2700 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2701#endif
2702#if EV_USE_POLL
2703 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2704#endif
2705#if EV_USE_SELECT
2706 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2707#endif
2708
2709 for (i = NUMPRI; i--; )
2710 {
2711 array_free (pending, [i]);
2712#if EV_IDLE_ENABLE
2713 array_free (idle, [i]);
2714#endif
2715 }
2716
2717 ev_free (anfds); anfds = 0; anfdmax = 0;
2718
2719 /* have to use the microsoft-never-gets-it-right macro */
2720 array_free (rfeed, EMPTY);
2721 array_free (fdchange, EMPTY);
2722 array_free (timer, EMPTY);
2723#if EV_PERIODIC_ENABLE
2724 array_free (periodic, EMPTY);
2725#endif
2726#if EV_FORK_ENABLE
2727 array_free (fork, EMPTY);
2728#endif
2729#if EV_CLEANUP_ENABLE
2730 array_free (cleanup, EMPTY);
2731#endif
2732 array_free (prepare, EMPTY);
2733 array_free (check, EMPTY);
2734#if EV_ASYNC_ENABLE
2735 array_free (async, EMPTY);
2736#endif
2737
2738 backend = 0;
2739
2740#if EV_MULTIPLICITY
2741 if (ev_is_default_loop (EV_A))
2742#endif
2743 ev_default_loop_ptr = 0;
2744#if EV_MULTIPLICITY
2745 else
2746 ev_free (EV_A);
2747#endif
2748}
2749
2750#if EV_USE_INOTIFY
2751inline_size void infy_fork (EV_P);
2752#endif
2753
2754inline_size void
2755loop_fork (EV_P)
2756{
2757#if EV_USE_PORT
2758 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2759#endif
2760#if EV_USE_KQUEUE
2761 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2762#endif
2763#if EV_USE_EPOLL
2764 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2765#endif
2766#if EV_USE_INOTIFY
2767 infy_fork (EV_A);
2768#endif
2769
2770#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2771 if (ev_is_active (&pipe_w))
2772 {
2773 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2774
2775 ev_ref (EV_A);
2776 ev_io_stop (EV_A_ &pipe_w);
2777
2778 if (evpipe [0] >= 0)
2779 EV_WIN32_CLOSE_FD (evpipe [0]);
2780
2781 evpipe_init (EV_A);
2782 /* iterate over everything, in case we missed something before */
2783 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2784 }
2785#endif
2786
2787 postfork = 0;
2788}
2789
2790#if EV_MULTIPLICITY
2791
2792struct ev_loop * ecb_cold
2793ev_loop_new (unsigned int flags) EV_THROW
2794{
2795 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2796
2797 memset (EV_A, 0, sizeof (struct ev_loop));
2798 loop_init (EV_A_ flags);
2799
2800 if (ev_backend (EV_A))
2801 return EV_A;
2802
2803 ev_free (EV_A);
2804 return 0;
2805}
2806
2807#endif /* multiplicity */
2808
2809#if EV_VERIFY
2810static void noinline ecb_cold
2811verify_watcher (EV_P_ W w)
2812{
2813 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2814
2815 if (w->pending)
2816 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2817}
2818
2819static void noinline ecb_cold
2820verify_heap (EV_P_ ANHE *heap, int N)
2821{
2822 int i;
2823
2824 for (i = HEAP0; i < N + HEAP0; ++i)
2825 {
2826 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2827 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2828 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2829
2830 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2831 }
2832}
2833
2834static void noinline ecb_cold
2835array_verify (EV_P_ W *ws, int cnt)
2836{
2837 while (cnt--)
2838 {
2839 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2840 verify_watcher (EV_A_ ws [cnt]);
2841 }
2842}
2843#endif
2844
2845#if EV_FEATURE_API
2846void ecb_cold
2847ev_verify (EV_P) EV_THROW
2848{
2849#if EV_VERIFY
2850 int i;
2851 WL w, w2;
2852
2853 assert (activecnt >= -1);
2854
2855 assert (fdchangemax >= fdchangecnt);
2856 for (i = 0; i < fdchangecnt; ++i)
2857 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2858
2859 assert (anfdmax >= 0);
2860 for (i = 0; i < anfdmax; ++i)
2861 {
2862 int j = 0;
2863
2864 for (w = w2 = anfds [i].head; w; w = w->next)
2865 {
2866 verify_watcher (EV_A_ (W)w);
2867
2868 if (j++ & 1)
2869 {
2870 assert (("libev: io watcher list contains a loop", w != w2));
2871 w2 = w2->next;
2872 }
2873
2874 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2875 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2876 }
2877 }
2878
2879 assert (timermax >= timercnt);
2880 verify_heap (EV_A_ timers, timercnt);
2881
2882#if EV_PERIODIC_ENABLE
2883 assert (periodicmax >= periodiccnt);
2884 verify_heap (EV_A_ periodics, periodiccnt);
2885#endif
2886
2887 for (i = NUMPRI; i--; )
2888 {
2889 assert (pendingmax [i] >= pendingcnt [i]);
2890#if EV_IDLE_ENABLE
2891 assert (idleall >= 0);
2892 assert (idlemax [i] >= idlecnt [i]);
2893 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2894#endif
2895 }
2896
2897#if EV_FORK_ENABLE
2898 assert (forkmax >= forkcnt);
2899 array_verify (EV_A_ (W *)forks, forkcnt);
2900#endif
2901
2902#if EV_CLEANUP_ENABLE
2903 assert (cleanupmax >= cleanupcnt);
2904 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2905#endif
2906
2907#if EV_ASYNC_ENABLE
2908 assert (asyncmax >= asynccnt);
2909 array_verify (EV_A_ (W *)asyncs, asynccnt);
2910#endif
2911
2912#if EV_PREPARE_ENABLE
2913 assert (preparemax >= preparecnt);
2914 array_verify (EV_A_ (W *)prepares, preparecnt);
2915#endif
2916
2917#if EV_CHECK_ENABLE
2918 assert (checkmax >= checkcnt);
2919 array_verify (EV_A_ (W *)checks, checkcnt);
2920#endif
2921
2922# if 0
2923#if EV_CHILD_ENABLE
2924 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2925 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2926#endif
2927# endif
2928#endif
2929}
2930#endif
2931
2932#if EV_MULTIPLICITY
2933struct ev_loop * ecb_cold
2934#else
2935int
2936#endif
2937ev_default_loop (unsigned int flags) EV_THROW
2938{
2939 if (!ev_default_loop_ptr)
2940 {
2941#if EV_MULTIPLICITY
2942 EV_P = ev_default_loop_ptr = &default_loop_struct;
2943#else
2944 ev_default_loop_ptr = 1;
2945#endif
2946
2947 loop_init (EV_A_ flags);
2948
2949 if (ev_backend (EV_A))
2950 {
2951#if EV_CHILD_ENABLE
2952 ev_signal_init (&childev, childcb, SIGCHLD);
2953 ev_set_priority (&childev, EV_MAXPRI);
2954 ev_signal_start (EV_A_ &childev);
2955 ev_unref (EV_A); /* child watcher should not keep loop alive */
2956#endif
2957 }
2958 else
2959 ev_default_loop_ptr = 0;
2960 }
2961
2962 return ev_default_loop_ptr;
2963}
2964
2965void
2966ev_loop_fork (EV_P) EV_THROW
2967{
2968 postfork = 1;
2969}
2970
2971/*****************************************************************************/
2972
2973void
2974ev_invoke (EV_P_ void *w, int revents)
2975{
2976 EV_CB_INVOKE ((W)w, revents);
2977}
2978
2979unsigned int
2980ev_pending_count (EV_P) EV_THROW
2981{
2982 int pri;
2983 unsigned int count = 0;
2984
2985 for (pri = NUMPRI; pri--; )
2986 count += pendingcnt [pri];
2987
2988 return count;
2989}
2990
2991void noinline
2992ev_invoke_pending (EV_P)
2993{
2994 pendingpri = NUMPRI;
2995
2996 while (pendingpri) /* pendingpri possibly gets modified in the inner loop */
2997 {
2998 --pendingpri;
2999
3000 while (pendingcnt [pendingpri])
3001 {
3002 ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
3003
397 p->w->pending = 0; 3004 p->w->pending = 0;
398 p->w->cb (p->w, p->events); 3005 EV_CB_INVOKE (p->w, p->events);
3006 EV_FREQUENT_CHECK;
399 } 3007 }
400 } 3008 }
401
402 pendingcnt = 0;
403} 3009}
404 3010
405static void 3011#if EV_IDLE_ENABLE
3012/* make idle watchers pending. this handles the "call-idle */
3013/* only when higher priorities are idle" logic */
3014inline_size void
3015idle_reify (EV_P)
3016{
3017 if (expect_false (idleall))
3018 {
3019 int pri;
3020
3021 for (pri = NUMPRI; pri--; )
3022 {
3023 if (pendingcnt [pri])
3024 break;
3025
3026 if (idlecnt [pri])
3027 {
3028 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
3029 break;
3030 }
3031 }
3032 }
3033}
3034#endif
3035
3036/* make timers pending */
3037inline_size void
406timers_reify () 3038timers_reify (EV_P)
407{ 3039{
408 while (timercnt && timers [0]->at <= now) 3040 EV_FREQUENT_CHECK;
409 {
410 struct ev_timer *w = timers [0];
411 3041
3042 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
3043 {
3044 do
3045 {
3046 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
3047
3048 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
3049
412 /* first reschedule or stop timer */ 3050 /* first reschedule or stop timer */
3051 if (w->repeat)
3052 {
3053 ev_at (w) += w->repeat;
3054 if (ev_at (w) < mn_now)
3055 ev_at (w) = mn_now;
3056
3057 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
3058
3059 ANHE_at_cache (timers [HEAP0]);
3060 downheap (timers, timercnt, HEAP0);
3061 }
3062 else
3063 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
3064
3065 EV_FREQUENT_CHECK;
3066 feed_reverse (EV_A_ (W)w);
3067 }
3068 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
3069
3070 feed_reverse_done (EV_A_ EV_TIMER);
3071 }
3072}
3073
3074#if EV_PERIODIC_ENABLE
3075
3076static void noinline
3077periodic_recalc (EV_P_ ev_periodic *w)
3078{
3079 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
3080 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
3081
3082 /* the above almost always errs on the low side */
3083 while (at <= ev_rt_now)
3084 {
3085 ev_tstamp nat = at + w->interval;
3086
3087 /* when resolution fails us, we use ev_rt_now */
3088 if (expect_false (nat == at))
3089 {
3090 at = ev_rt_now;
3091 break;
3092 }
3093
3094 at = nat;
3095 }
3096
3097 ev_at (w) = at;
3098}
3099
3100/* make periodics pending */
3101inline_size void
3102periodics_reify (EV_P)
3103{
3104 EV_FREQUENT_CHECK;
3105
3106 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
3107 {
3108 do
3109 {
3110 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
3111
3112 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
3113
3114 /* first reschedule or stop timer */
3115 if (w->reschedule_cb)
3116 {
3117 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3118
3119 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
3120
3121 ANHE_at_cache (periodics [HEAP0]);
3122 downheap (periodics, periodiccnt, HEAP0);
3123 }
3124 else if (w->interval)
3125 {
3126 periodic_recalc (EV_A_ w);
3127 ANHE_at_cache (periodics [HEAP0]);
3128 downheap (periodics, periodiccnt, HEAP0);
3129 }
3130 else
3131 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
3132
3133 EV_FREQUENT_CHECK;
3134 feed_reverse (EV_A_ (W)w);
3135 }
3136 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
3137
3138 feed_reverse_done (EV_A_ EV_PERIODIC);
3139 }
3140}
3141
3142/* simply recalculate all periodics */
3143/* TODO: maybe ensure that at least one event happens when jumping forward? */
3144static void noinline ecb_cold
3145periodics_reschedule (EV_P)
3146{
3147 int i;
3148
3149 /* adjust periodics after time jump */
3150 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
3151 {
3152 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
3153
3154 if (w->reschedule_cb)
3155 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3156 else if (w->interval)
3157 periodic_recalc (EV_A_ w);
3158
3159 ANHE_at_cache (periodics [i]);
3160 }
3161
3162 reheap (periodics, periodiccnt);
3163}
3164#endif
3165
3166/* adjust all timers by a given offset */
3167static void noinline ecb_cold
3168timers_reschedule (EV_P_ ev_tstamp adjust)
3169{
3170 int i;
3171
3172 for (i = 0; i < timercnt; ++i)
3173 {
3174 ANHE *he = timers + i + HEAP0;
3175 ANHE_w (*he)->at += adjust;
3176 ANHE_at_cache (*he);
3177 }
3178}
3179
3180/* fetch new monotonic and realtime times from the kernel */
3181/* also detect if there was a timejump, and act accordingly */
3182inline_speed void
3183time_update (EV_P_ ev_tstamp max_block)
3184{
3185#if EV_USE_MONOTONIC
3186 if (expect_true (have_monotonic))
3187 {
3188 int i;
3189 ev_tstamp odiff = rtmn_diff;
3190
3191 mn_now = get_clock ();
3192
3193 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
3194 /* interpolate in the meantime */
3195 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
3196 {
3197 ev_rt_now = rtmn_diff + mn_now;
3198 return;
3199 }
3200
3201 now_floor = mn_now;
3202 ev_rt_now = ev_time ();
3203
3204 /* loop a few times, before making important decisions.
3205 * on the choice of "4": one iteration isn't enough,
3206 * in case we get preempted during the calls to
3207 * ev_time and get_clock. a second call is almost guaranteed
3208 * to succeed in that case, though. and looping a few more times
3209 * doesn't hurt either as we only do this on time-jumps or
3210 * in the unlikely event of having been preempted here.
3211 */
3212 for (i = 4; --i; )
3213 {
3214 ev_tstamp diff;
3215 rtmn_diff = ev_rt_now - mn_now;
3216
3217 diff = odiff - rtmn_diff;
3218
3219 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
3220 return; /* all is well */
3221
3222 ev_rt_now = ev_time ();
3223 mn_now = get_clock ();
3224 now_floor = mn_now;
3225 }
3226
3227 /* no timer adjustment, as the monotonic clock doesn't jump */
3228 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
3229# if EV_PERIODIC_ENABLE
3230 periodics_reschedule (EV_A);
3231# endif
3232 }
3233 else
3234#endif
3235 {
3236 ev_rt_now = ev_time ();
3237
3238 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
3239 {
3240 /* adjust timers. this is easy, as the offset is the same for all of them */
3241 timers_reschedule (EV_A_ ev_rt_now - mn_now);
3242#if EV_PERIODIC_ENABLE
3243 periodics_reschedule (EV_A);
3244#endif
3245 }
3246
3247 mn_now = ev_rt_now;
3248 }
3249}
3250
3251int
3252ev_run (EV_P_ int flags)
3253{
3254#if EV_FEATURE_API
3255 ++loop_depth;
3256#endif
3257
3258 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
3259
3260 loop_done = EVBREAK_CANCEL;
3261
3262 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
3263
3264 do
3265 {
3266#if EV_VERIFY >= 2
3267 ev_verify (EV_A);
3268#endif
3269
3270#ifndef _WIN32
3271 if (expect_false (curpid)) /* penalise the forking check even more */
3272 if (expect_false (getpid () != curpid))
3273 {
3274 curpid = getpid ();
3275 postfork = 1;
3276 }
3277#endif
3278
3279#if EV_FORK_ENABLE
3280 /* we might have forked, so queue fork handlers */
3281 if (expect_false (postfork))
3282 if (forkcnt)
3283 {
3284 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
3285 EV_INVOKE_PENDING;
3286 }
3287#endif
3288
3289#if EV_PREPARE_ENABLE
3290 /* queue prepare watchers (and execute them) */
3291 if (expect_false (preparecnt))
3292 {
3293 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
3294 EV_INVOKE_PENDING;
3295 }
3296#endif
3297
3298 if (expect_false (loop_done))
3299 break;
3300
3301 /* we might have forked, so reify kernel state if necessary */
3302 if (expect_false (postfork))
3303 loop_fork (EV_A);
3304
3305 /* update fd-related kernel structures */
3306 fd_reify (EV_A);
3307
3308 /* calculate blocking time */
3309 {
3310 ev_tstamp waittime = 0.;
3311 ev_tstamp sleeptime = 0.;
3312
3313 /* remember old timestamp for io_blocktime calculation */
3314 ev_tstamp prev_mn_now = mn_now;
3315
3316 /* update time to cancel out callback processing overhead */
3317 time_update (EV_A_ 1e100);
3318
3319 /* from now on, we want a pipe-wake-up */
3320 pipe_write_wanted = 1;
3321
3322 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3323
3324 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3325 {
3326 waittime = MAX_BLOCKTIME;
3327
3328 if (timercnt)
3329 {
3330 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3331 if (waittime > to) waittime = to;
3332 }
3333
3334#if EV_PERIODIC_ENABLE
3335 if (periodiccnt)
3336 {
3337 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3338 if (waittime > to) waittime = to;
3339 }
3340#endif
3341
3342 /* don't let timeouts decrease the waittime below timeout_blocktime */
3343 if (expect_false (waittime < timeout_blocktime))
3344 waittime = timeout_blocktime;
3345
3346 /* at this point, we NEED to wait, so we have to ensure */
3347 /* to pass a minimum nonzero value to the backend */
3348 if (expect_false (waittime < backend_mintime))
3349 waittime = backend_mintime;
3350
3351 /* extra check because io_blocktime is commonly 0 */
3352 if (expect_false (io_blocktime))
3353 {
3354 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3355
3356 if (sleeptime > waittime - backend_mintime)
3357 sleeptime = waittime - backend_mintime;
3358
3359 if (expect_true (sleeptime > 0.))
3360 {
3361 ev_sleep (sleeptime);
3362 waittime -= sleeptime;
3363 }
3364 }
3365 }
3366
3367#if EV_FEATURE_API
3368 ++loop_count;
3369#endif
3370 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3371 backend_poll (EV_A_ waittime);
3372 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3373
3374 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3375
3376 ECB_MEMORY_FENCE_ACQUIRE;
3377 if (pipe_write_skipped)
3378 {
3379 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3380 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3381 }
3382
3383
3384 /* update ev_rt_now, do magic */
3385 time_update (EV_A_ waittime + sleeptime);
3386 }
3387
3388 /* queue pending timers and reschedule them */
3389 timers_reify (EV_A); /* relative timers called last */
3390#if EV_PERIODIC_ENABLE
3391 periodics_reify (EV_A); /* absolute timers called first */
3392#endif
3393
3394#if EV_IDLE_ENABLE
3395 /* queue idle watchers unless other events are pending */
3396 idle_reify (EV_A);
3397#endif
3398
3399#if EV_CHECK_ENABLE
3400 /* queue check watchers, to be executed first */
3401 if (expect_false (checkcnt))
3402 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3403#endif
3404
3405 EV_INVOKE_PENDING;
3406 }
3407 while (expect_true (
3408 activecnt
3409 && !loop_done
3410 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3411 ));
3412
3413 if (loop_done == EVBREAK_ONE)
3414 loop_done = EVBREAK_CANCEL;
3415
3416#if EV_FEATURE_API
3417 --loop_depth;
3418#endif
3419
3420 return activecnt;
3421}
3422
3423void
3424ev_break (EV_P_ int how) EV_THROW
3425{
3426 loop_done = how;
3427}
3428
3429void
3430ev_ref (EV_P) EV_THROW
3431{
3432 ++activecnt;
3433}
3434
3435void
3436ev_unref (EV_P) EV_THROW
3437{
3438 --activecnt;
3439}
3440
3441void
3442ev_now_update (EV_P) EV_THROW
3443{
3444 time_update (EV_A_ 1e100);
3445}
3446
3447void
3448ev_suspend (EV_P) EV_THROW
3449{
3450 ev_now_update (EV_A);
3451}
3452
3453void
3454ev_resume (EV_P) EV_THROW
3455{
3456 ev_tstamp mn_prev = mn_now;
3457
3458 ev_now_update (EV_A);
3459 timers_reschedule (EV_A_ mn_now - mn_prev);
3460#if EV_PERIODIC_ENABLE
3461 /* TODO: really do this? */
3462 periodics_reschedule (EV_A);
3463#endif
3464}
3465
3466/*****************************************************************************/
3467/* singly-linked list management, used when the expected list length is short */
3468
3469inline_size void
3470wlist_add (WL *head, WL elem)
3471{
3472 elem->next = *head;
3473 *head = elem;
3474}
3475
3476inline_size void
3477wlist_del (WL *head, WL elem)
3478{
3479 while (*head)
3480 {
3481 if (expect_true (*head == elem))
3482 {
3483 *head = elem->next;
3484 break;
3485 }
3486
3487 head = &(*head)->next;
3488 }
3489}
3490
3491/* internal, faster, version of ev_clear_pending */
3492inline_speed void
3493clear_pending (EV_P_ W w)
3494{
3495 if (w->pending)
3496 {
3497 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3498 w->pending = 0;
3499 }
3500}
3501
3502int
3503ev_clear_pending (EV_P_ void *w) EV_THROW
3504{
3505 W w_ = (W)w;
3506 int pending = w_->pending;
3507
3508 if (expect_true (pending))
3509 {
3510 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3511 p->w = (W)&pending_w;
3512 w_->pending = 0;
3513 return p->events;
3514 }
3515 else
3516 return 0;
3517}
3518
3519inline_size void
3520pri_adjust (EV_P_ W w)
3521{
3522 int pri = ev_priority (w);
3523 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3524 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3525 ev_set_priority (w, pri);
3526}
3527
3528inline_speed void
3529ev_start (EV_P_ W w, int active)
3530{
3531 pri_adjust (EV_A_ w);
3532 w->active = active;
3533 ev_ref (EV_A);
3534}
3535
3536inline_size void
3537ev_stop (EV_P_ W w)
3538{
3539 ev_unref (EV_A);
3540 w->active = 0;
3541}
3542
3543/*****************************************************************************/
3544
3545void noinline
3546ev_io_start (EV_P_ ev_io *w) EV_THROW
3547{
3548 int fd = w->fd;
3549
3550 if (expect_false (ev_is_active (w)))
3551 return;
3552
3553 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3554 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3555
3556 EV_FREQUENT_CHECK;
3557
3558 ev_start (EV_A_ (W)w, 1);
3559 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3560 wlist_add (&anfds[fd].head, (WL)w);
3561
3562 /* common bug, apparently */
3563 assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
3564
3565 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3566 w->events &= ~EV__IOFDSET;
3567
3568 EV_FREQUENT_CHECK;
3569}
3570
3571void noinline
3572ev_io_stop (EV_P_ ev_io *w) EV_THROW
3573{
3574 clear_pending (EV_A_ (W)w);
3575 if (expect_false (!ev_is_active (w)))
3576 return;
3577
3578 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3579
3580 EV_FREQUENT_CHECK;
3581
3582 wlist_del (&anfds[w->fd].head, (WL)w);
3583 ev_stop (EV_A_ (W)w);
3584
3585 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3586
3587 EV_FREQUENT_CHECK;
3588}
3589
3590void noinline
3591ev_timer_start (EV_P_ ev_timer *w) EV_THROW
3592{
3593 if (expect_false (ev_is_active (w)))
3594 return;
3595
3596 ev_at (w) += mn_now;
3597
3598 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3599
3600 EV_FREQUENT_CHECK;
3601
3602 ++timercnt;
3603 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3604 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3605 ANHE_w (timers [ev_active (w)]) = (WT)w;
3606 ANHE_at_cache (timers [ev_active (w)]);
3607 upheap (timers, ev_active (w));
3608
3609 EV_FREQUENT_CHECK;
3610
3611 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3612}
3613
3614void noinline
3615ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
3616{
3617 clear_pending (EV_A_ (W)w);
3618 if (expect_false (!ev_is_active (w)))
3619 return;
3620
3621 EV_FREQUENT_CHECK;
3622
3623 {
3624 int active = ev_active (w);
3625
3626 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3627
3628 --timercnt;
3629
3630 if (expect_true (active < timercnt + HEAP0))
3631 {
3632 timers [active] = timers [timercnt + HEAP0];
3633 adjustheap (timers, timercnt, active);
3634 }
3635 }
3636
3637 ev_at (w) -= mn_now;
3638
3639 ev_stop (EV_A_ (W)w);
3640
3641 EV_FREQUENT_CHECK;
3642}
3643
3644void noinline
3645ev_timer_again (EV_P_ ev_timer *w) EV_THROW
3646{
3647 EV_FREQUENT_CHECK;
3648
3649 clear_pending (EV_A_ (W)w);
3650
3651 if (ev_is_active (w))
3652 {
413 if (w->repeat) 3653 if (w->repeat)
414 { 3654 {
415 w->at = now + w->repeat; 3655 ev_at (w) = mn_now + w->repeat;
416 assert (("timer timeout in the past, negative repeat?", w->at > now)); 3656 ANHE_at_cache (timers [ev_active (w)]);
417 downheap ((WT *)timers, timercnt, 0); 3657 adjustheap (timers, timercnt, ev_active (w));
418 } 3658 }
419 else 3659 else
420 evtimer_stop (w); /* nonrepeating: stop timer */ 3660 ev_timer_stop (EV_A_ w);
421
422 event ((W)w, EV_TIMEOUT);
423 }
424}
425
426static void
427periodics_reify ()
428{
429 while (periodiccnt && periodics [0]->at <= ev_now)
430 { 3661 }
431 struct ev_periodic *w = periodics [0]; 3662 else if (w->repeat)
3663 {
3664 ev_at (w) = w->repeat;
3665 ev_timer_start (EV_A_ w);
3666 }
432 3667
433 /* first reschedule or stop timer */ 3668 EV_FREQUENT_CHECK;
3669}
3670
3671ev_tstamp
3672ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
3673{
3674 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3675}
3676
3677#if EV_PERIODIC_ENABLE
3678void noinline
3679ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
3680{
3681 if (expect_false (ev_is_active (w)))
3682 return;
3683
3684 if (w->reschedule_cb)
3685 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
434 if (w->interval) 3686 else if (w->interval)
3687 {
3688 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3689 periodic_recalc (EV_A_ w);
3690 }
3691 else
3692 ev_at (w) = w->offset;
3693
3694 EV_FREQUENT_CHECK;
3695
3696 ++periodiccnt;
3697 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3698 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3699 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3700 ANHE_at_cache (periodics [ev_active (w)]);
3701 upheap (periodics, ev_active (w));
3702
3703 EV_FREQUENT_CHECK;
3704
3705 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3706}
3707
3708void noinline
3709ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
3710{
3711 clear_pending (EV_A_ (W)w);
3712 if (expect_false (!ev_is_active (w)))
3713 return;
3714
3715 EV_FREQUENT_CHECK;
3716
3717 {
3718 int active = ev_active (w);
3719
3720 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3721
3722 --periodiccnt;
3723
3724 if (expect_true (active < periodiccnt + HEAP0))
3725 {
3726 periodics [active] = periodics [periodiccnt + HEAP0];
3727 adjustheap (periodics, periodiccnt, active);
3728 }
3729 }
3730
3731 ev_stop (EV_A_ (W)w);
3732
3733 EV_FREQUENT_CHECK;
3734}
3735
3736void noinline
3737ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
3738{
3739 /* TODO: use adjustheap and recalculation */
3740 ev_periodic_stop (EV_A_ w);
3741 ev_periodic_start (EV_A_ w);
3742}
3743#endif
3744
3745#ifndef SA_RESTART
3746# define SA_RESTART 0
3747#endif
3748
3749#if EV_SIGNAL_ENABLE
3750
3751void noinline
3752ev_signal_start (EV_P_ ev_signal *w) EV_THROW
3753{
3754 if (expect_false (ev_is_active (w)))
3755 return;
3756
3757 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3758
3759#if EV_MULTIPLICITY
3760 assert (("libev: a signal must not be attached to two different loops",
3761 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3762
3763 signals [w->signum - 1].loop = EV_A;
3764 ECB_MEMORY_FENCE_RELEASE;
3765#endif
3766
3767 EV_FREQUENT_CHECK;
3768
3769#if EV_USE_SIGNALFD
3770 if (sigfd == -2)
3771 {
3772 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3773 if (sigfd < 0 && errno == EINVAL)
3774 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3775
3776 if (sigfd >= 0)
435 { 3777 {
436 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 3778 fd_intern (sigfd); /* doing it twice will not hurt */
437 assert (("periodic timeout in the past, negative interval?", w->at > ev_now)); 3779
438 downheap ((WT *)periodics, periodiccnt, 0); 3780 sigemptyset (&sigfd_set);
3781
3782 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3783 ev_set_priority (&sigfd_w, EV_MAXPRI);
3784 ev_io_start (EV_A_ &sigfd_w);
3785 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3786 }
3787 }
3788
3789 if (sigfd >= 0)
3790 {
3791 /* TODO: check .head */
3792 sigaddset (&sigfd_set, w->signum);
3793 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3794
3795 signalfd (sigfd, &sigfd_set, 0);
3796 }
3797#endif
3798
3799 ev_start (EV_A_ (W)w, 1);
3800 wlist_add (&signals [w->signum - 1].head, (WL)w);
3801
3802 if (!((WL)w)->next)
3803# if EV_USE_SIGNALFD
3804 if (sigfd < 0) /*TODO*/
3805# endif
3806 {
3807# ifdef _WIN32
3808 evpipe_init (EV_A);
3809
3810 signal (w->signum, ev_sighandler);
3811# else
3812 struct sigaction sa;
3813
3814 evpipe_init (EV_A);
3815
3816 sa.sa_handler = ev_sighandler;
3817 sigfillset (&sa.sa_mask);
3818 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3819 sigaction (w->signum, &sa, 0);
3820
3821 if (origflags & EVFLAG_NOSIGMASK)
3822 {
3823 sigemptyset (&sa.sa_mask);
3824 sigaddset (&sa.sa_mask, w->signum);
3825 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3826 }
3827#endif
3828 }
3829
3830 EV_FREQUENT_CHECK;
3831}
3832
3833void noinline
3834ev_signal_stop (EV_P_ ev_signal *w) EV_THROW
3835{
3836 clear_pending (EV_A_ (W)w);
3837 if (expect_false (!ev_is_active (w)))
3838 return;
3839
3840 EV_FREQUENT_CHECK;
3841
3842 wlist_del (&signals [w->signum - 1].head, (WL)w);
3843 ev_stop (EV_A_ (W)w);
3844
3845 if (!signals [w->signum - 1].head)
3846 {
3847#if EV_MULTIPLICITY
3848 signals [w->signum - 1].loop = 0; /* unattach from signal */
3849#endif
3850#if EV_USE_SIGNALFD
3851 if (sigfd >= 0)
3852 {
3853 sigset_t ss;
3854
3855 sigemptyset (&ss);
3856 sigaddset (&ss, w->signum);
3857 sigdelset (&sigfd_set, w->signum);
3858
3859 signalfd (sigfd, &sigfd_set, 0);
3860 sigprocmask (SIG_UNBLOCK, &ss, 0);
439 } 3861 }
440 else 3862 else
441 evperiodic_stop (w); /* nonrepeating: stop timer */ 3863#endif
442 3864 signal (w->signum, SIG_DFL);
443 event ((W)w, EV_TIMEOUT);
444 }
445}
446
447static void
448periodics_reschedule (ev_tstamp diff)
449{
450 int i;
451
452 /* adjust periodics after time jump */
453 for (i = 0; i < periodiccnt; ++i)
454 { 3865 }
455 struct ev_periodic *w = periodics [i];
456 3866
457 if (w->interval) 3867 EV_FREQUENT_CHECK;
3868}
3869
3870#endif
3871
3872#if EV_CHILD_ENABLE
3873
3874void
3875ev_child_start (EV_P_ ev_child *w) EV_THROW
3876{
3877#if EV_MULTIPLICITY
3878 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3879#endif
3880 if (expect_false (ev_is_active (w)))
3881 return;
3882
3883 EV_FREQUENT_CHECK;
3884
3885 ev_start (EV_A_ (W)w, 1);
3886 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3887
3888 EV_FREQUENT_CHECK;
3889}
3890
3891void
3892ev_child_stop (EV_P_ ev_child *w) EV_THROW
3893{
3894 clear_pending (EV_A_ (W)w);
3895 if (expect_false (!ev_is_active (w)))
3896 return;
3897
3898 EV_FREQUENT_CHECK;
3899
3900 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3901 ev_stop (EV_A_ (W)w);
3902
3903 EV_FREQUENT_CHECK;
3904}
3905
3906#endif
3907
3908#if EV_STAT_ENABLE
3909
3910# ifdef _WIN32
3911# undef lstat
3912# define lstat(a,b) _stati64 (a,b)
3913# endif
3914
3915#define DEF_STAT_INTERVAL 5.0074891
3916#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3917#define MIN_STAT_INTERVAL 0.1074891
3918
3919static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3920
3921#if EV_USE_INOTIFY
3922
3923/* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3924# define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3925
3926static void noinline
3927infy_add (EV_P_ ev_stat *w)
3928{
3929 w->wd = inotify_add_watch (fs_fd, w->path,
3930 IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY
3931 | IN_CREATE | IN_DELETE | IN_MOVED_FROM | IN_MOVED_TO
3932 | IN_DONT_FOLLOW | IN_MASK_ADD);
3933
3934 if (w->wd >= 0)
3935 {
3936 struct statfs sfs;
3937
3938 /* now local changes will be tracked by inotify, but remote changes won't */
3939 /* unless the filesystem is known to be local, we therefore still poll */
3940 /* also do poll on <2.6.25, but with normal frequency */
3941
3942 if (!fs_2625)
3943 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3944 else if (!statfs (w->path, &sfs)
3945 && (sfs.f_type == 0x1373 /* devfs */
3946 || sfs.f_type == 0x4006 /* fat */
3947 || sfs.f_type == 0x4d44 /* msdos */
3948 || sfs.f_type == 0xEF53 /* ext2/3 */
3949 || sfs.f_type == 0x72b6 /* jffs2 */
3950 || sfs.f_type == 0x858458f6 /* ramfs */
3951 || sfs.f_type == 0x5346544e /* ntfs */
3952 || sfs.f_type == 0x3153464a /* jfs */
3953 || sfs.f_type == 0x9123683e /* btrfs */
3954 || sfs.f_type == 0x52654973 /* reiser3 */
3955 || sfs.f_type == 0x01021994 /* tmpfs */
3956 || sfs.f_type == 0x58465342 /* xfs */))
3957 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3958 else
3959 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3960 }
3961 else
3962 {
3963 /* can't use inotify, continue to stat */
3964 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3965
3966 /* if path is not there, monitor some parent directory for speedup hints */
3967 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3968 /* but an efficiency issue only */
3969 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
458 { 3970 {
459 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 3971 char path [4096];
3972 strcpy (path, w->path);
460 3973
461 if (fabs (diff) >= 1e-4) 3974 do
462 { 3975 {
463 evperiodic_stop (w); 3976 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
464 evperiodic_start (w); 3977 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
465 3978
466 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 3979 char *pend = strrchr (path, '/');
3980
3981 if (!pend || pend == path)
3982 break;
3983
3984 *pend = 0;
3985 w->wd = inotify_add_watch (fs_fd, path, mask);
3986 }
3987 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3988 }
3989 }
3990
3991 if (w->wd >= 0)
3992 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3993
3994 /* now re-arm timer, if required */
3995 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3996 ev_timer_again (EV_A_ &w->timer);
3997 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3998}
3999
4000static void noinline
4001infy_del (EV_P_ ev_stat *w)
4002{
4003 int slot;
4004 int wd = w->wd;
4005
4006 if (wd < 0)
4007 return;
4008
4009 w->wd = -2;
4010 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
4011 wlist_del (&fs_hash [slot].head, (WL)w);
4012
4013 /* remove this watcher, if others are watching it, they will rearm */
4014 inotify_rm_watch (fs_fd, wd);
4015}
4016
4017static void noinline
4018infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
4019{
4020 if (slot < 0)
4021 /* overflow, need to check for all hash slots */
4022 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
4023 infy_wd (EV_A_ slot, wd, ev);
4024 else
4025 {
4026 WL w_;
4027
4028 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
4029 {
4030 ev_stat *w = (ev_stat *)w_;
4031 w_ = w_->next; /* lets us remove this watcher and all before it */
4032
4033 if (w->wd == wd || wd == -1)
4034 {
4035 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
4036 {
4037 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
4038 w->wd = -1;
4039 infy_add (EV_A_ w); /* re-add, no matter what */
4040 }
4041
4042 stat_timer_cb (EV_A_ &w->timer, 0);
467 } 4043 }
468 } 4044 }
469 } 4045 }
470} 4046}
471 4047
472static void 4048static void
473time_update () 4049infy_cb (EV_P_ ev_io *w, int revents)
474{ 4050{
4051 char buf [EV_INOTIFY_BUFSIZE];
475 int i; 4052 int ofs;
4053 int len = read (fs_fd, buf, sizeof (buf));
476 4054
477 ev_now = ev_time (); 4055 for (ofs = 0; ofs < len; )
478 4056 {
479 if (have_monotonic) 4057 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
4058 infy_wd (EV_A_ ev->wd, ev->wd, ev);
4059 ofs += sizeof (struct inotify_event) + ev->len;
480 { 4060 }
481 ev_tstamp odiff = diff; 4061}
482 4062
483 for (i = 4; --i; ) /* loop a few times, before making important decisions */ 4063inline_size void ecb_cold
4064ev_check_2625 (EV_P)
4065{
4066 /* kernels < 2.6.25 are borked
4067 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
4068 */
4069 if (ev_linux_version () < 0x020619)
4070 return;
4071
4072 fs_2625 = 1;
4073}
4074
4075inline_size int
4076infy_newfd (void)
4077{
4078#if defined IN_CLOEXEC && defined IN_NONBLOCK
4079 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
4080 if (fd >= 0)
4081 return fd;
4082#endif
4083 return inotify_init ();
4084}
4085
4086inline_size void
4087infy_init (EV_P)
4088{
4089 if (fs_fd != -2)
4090 return;
4091
4092 fs_fd = -1;
4093
4094 ev_check_2625 (EV_A);
4095
4096 fs_fd = infy_newfd ();
4097
4098 if (fs_fd >= 0)
4099 {
4100 fd_intern (fs_fd);
4101 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
4102 ev_set_priority (&fs_w, EV_MAXPRI);
4103 ev_io_start (EV_A_ &fs_w);
4104 ev_unref (EV_A);
4105 }
4106}
4107
4108inline_size void
4109infy_fork (EV_P)
4110{
4111 int slot;
4112
4113 if (fs_fd < 0)
4114 return;
4115
4116 ev_ref (EV_A);
4117 ev_io_stop (EV_A_ &fs_w);
4118 close (fs_fd);
4119 fs_fd = infy_newfd ();
4120
4121 if (fs_fd >= 0)
4122 {
4123 fd_intern (fs_fd);
4124 ev_io_set (&fs_w, fs_fd, EV_READ);
4125 ev_io_start (EV_A_ &fs_w);
4126 ev_unref (EV_A);
4127 }
4128
4129 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
4130 {
4131 WL w_ = fs_hash [slot].head;
4132 fs_hash [slot].head = 0;
4133
4134 while (w_)
484 { 4135 {
485 now = get_clock (); 4136 ev_stat *w = (ev_stat *)w_;
486 diff = ev_now - now; 4137 w_ = w_->next; /* lets us add this watcher */
487 4138
488 if (fabs (odiff - diff) < MIN_TIMEJUMP) 4139 w->wd = -1;
489 return; /* all is well */
490 4140
491 ev_now = ev_time (); 4141 if (fs_fd >= 0)
4142 infy_add (EV_A_ w); /* re-add, no matter what */
4143 else
4144 {
4145 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
4146 if (ev_is_active (&w->timer)) ev_ref (EV_A);
4147 ev_timer_again (EV_A_ &w->timer);
4148 if (ev_is_active (&w->timer)) ev_unref (EV_A);
4149 }
492 } 4150 }
493
494 periodics_reschedule (diff - odiff);
495 /* no timer adjustment, as the monotonic clock doesn't jump */
496 } 4151 }
4152}
4153
4154#endif
4155
4156#ifdef _WIN32
4157# define EV_LSTAT(p,b) _stati64 (p, b)
4158#else
4159# define EV_LSTAT(p,b) lstat (p, b)
4160#endif
4161
4162void
4163ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
4164{
4165 if (lstat (w->path, &w->attr) < 0)
4166 w->attr.st_nlink = 0;
4167 else if (!w->attr.st_nlink)
4168 w->attr.st_nlink = 1;
4169}
4170
4171static void noinline
4172stat_timer_cb (EV_P_ ev_timer *w_, int revents)
4173{
4174 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
4175
4176 ev_statdata prev = w->attr;
4177 ev_stat_stat (EV_A_ w);
4178
4179 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
4180 if (
4181 prev.st_dev != w->attr.st_dev
4182 || prev.st_ino != w->attr.st_ino
4183 || prev.st_mode != w->attr.st_mode
4184 || prev.st_nlink != w->attr.st_nlink
4185 || prev.st_uid != w->attr.st_uid
4186 || prev.st_gid != w->attr.st_gid
4187 || prev.st_rdev != w->attr.st_rdev
4188 || prev.st_size != w->attr.st_size
4189 || prev.st_atime != w->attr.st_atime
4190 || prev.st_mtime != w->attr.st_mtime
4191 || prev.st_ctime != w->attr.st_ctime
4192 ) {
4193 /* we only update w->prev on actual differences */
4194 /* in case we test more often than invoke the callback, */
4195 /* to ensure that prev is always different to attr */
4196 w->prev = prev;
4197
4198 #if EV_USE_INOTIFY
4199 if (fs_fd >= 0)
4200 {
4201 infy_del (EV_A_ w);
4202 infy_add (EV_A_ w);
4203 ev_stat_stat (EV_A_ w); /* avoid race... */
4204 }
4205 #endif
4206
4207 ev_feed_event (EV_A_ w, EV_STAT);
4208 }
4209}
4210
4211void
4212ev_stat_start (EV_P_ ev_stat *w) EV_THROW
4213{
4214 if (expect_false (ev_is_active (w)))
4215 return;
4216
4217 ev_stat_stat (EV_A_ w);
4218
4219 if (w->interval < MIN_STAT_INTERVAL && w->interval)
4220 w->interval = MIN_STAT_INTERVAL;
4221
4222 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
4223 ev_set_priority (&w->timer, ev_priority (w));
4224
4225#if EV_USE_INOTIFY
4226 infy_init (EV_A);
4227
4228 if (fs_fd >= 0)
4229 infy_add (EV_A_ w);
497 else 4230 else
4231#endif
4232 {
4233 ev_timer_again (EV_A_ &w->timer);
4234 ev_unref (EV_A);
4235 }
4236
4237 ev_start (EV_A_ (W)w, 1);
4238
4239 EV_FREQUENT_CHECK;
4240}
4241
4242void
4243ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
4244{
4245 clear_pending (EV_A_ (W)w);
4246 if (expect_false (!ev_is_active (w)))
4247 return;
4248
4249 EV_FREQUENT_CHECK;
4250
4251#if EV_USE_INOTIFY
4252 infy_del (EV_A_ w);
4253#endif
4254
4255 if (ev_is_active (&w->timer))
4256 {
4257 ev_ref (EV_A);
4258 ev_timer_stop (EV_A_ &w->timer);
4259 }
4260
4261 ev_stop (EV_A_ (W)w);
4262
4263 EV_FREQUENT_CHECK;
4264}
4265#endif
4266
4267#if EV_IDLE_ENABLE
4268void
4269ev_idle_start (EV_P_ ev_idle *w) EV_THROW
4270{
4271 if (expect_false (ev_is_active (w)))
4272 return;
4273
4274 pri_adjust (EV_A_ (W)w);
4275
4276 EV_FREQUENT_CHECK;
4277
4278 {
4279 int active = ++idlecnt [ABSPRI (w)];
4280
4281 ++idleall;
4282 ev_start (EV_A_ (W)w, active);
4283
4284 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
4285 idles [ABSPRI (w)][active - 1] = w;
4286 }
4287
4288 EV_FREQUENT_CHECK;
4289}
4290
4291void
4292ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
4293{
4294 clear_pending (EV_A_ (W)w);
4295 if (expect_false (!ev_is_active (w)))
4296 return;
4297
4298 EV_FREQUENT_CHECK;
4299
4300 {
4301 int active = ev_active (w);
4302
4303 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
4304 ev_active (idles [ABSPRI (w)][active - 1]) = active;
4305
4306 ev_stop (EV_A_ (W)w);
4307 --idleall;
4308 }
4309
4310 EV_FREQUENT_CHECK;
4311}
4312#endif
4313
4314#if EV_PREPARE_ENABLE
4315void
4316ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
4317{
4318 if (expect_false (ev_is_active (w)))
4319 return;
4320
4321 EV_FREQUENT_CHECK;
4322
4323 ev_start (EV_A_ (W)w, ++preparecnt);
4324 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
4325 prepares [preparecnt - 1] = w;
4326
4327 EV_FREQUENT_CHECK;
4328}
4329
4330void
4331ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
4332{
4333 clear_pending (EV_A_ (W)w);
4334 if (expect_false (!ev_is_active (w)))
4335 return;
4336
4337 EV_FREQUENT_CHECK;
4338
4339 {
4340 int active = ev_active (w);
4341
4342 prepares [active - 1] = prepares [--preparecnt];
4343 ev_active (prepares [active - 1]) = active;
4344 }
4345
4346 ev_stop (EV_A_ (W)w);
4347
4348 EV_FREQUENT_CHECK;
4349}
4350#endif
4351
4352#if EV_CHECK_ENABLE
4353void
4354ev_check_start (EV_P_ ev_check *w) EV_THROW
4355{
4356 if (expect_false (ev_is_active (w)))
4357 return;
4358
4359 EV_FREQUENT_CHECK;
4360
4361 ev_start (EV_A_ (W)w, ++checkcnt);
4362 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4363 checks [checkcnt - 1] = w;
4364
4365 EV_FREQUENT_CHECK;
4366}
4367
4368void
4369ev_check_stop (EV_P_ ev_check *w) EV_THROW
4370{
4371 clear_pending (EV_A_ (W)w);
4372 if (expect_false (!ev_is_active (w)))
4373 return;
4374
4375 EV_FREQUENT_CHECK;
4376
4377 {
4378 int active = ev_active (w);
4379
4380 checks [active - 1] = checks [--checkcnt];
4381 ev_active (checks [active - 1]) = active;
4382 }
4383
4384 ev_stop (EV_A_ (W)w);
4385
4386 EV_FREQUENT_CHECK;
4387}
4388#endif
4389
4390#if EV_EMBED_ENABLE
4391void noinline
4392ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
4393{
4394 ev_run (w->other, EVRUN_NOWAIT);
4395}
4396
4397static void
4398embed_io_cb (EV_P_ ev_io *io, int revents)
4399{
4400 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4401
4402 if (ev_cb (w))
4403 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4404 else
4405 ev_run (w->other, EVRUN_NOWAIT);
4406}
4407
4408static void
4409embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4410{
4411 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4412
4413 {
4414 EV_P = w->other;
4415
4416 while (fdchangecnt)
498 { 4417 {
499 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) 4418 fd_reify (EV_A);
4419 ev_run (EV_A_ EVRUN_NOWAIT);
4420 }
4421 }
4422}
4423
4424static void
4425embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4426{
4427 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4428
4429 ev_embed_stop (EV_A_ w);
4430
4431 {
4432 EV_P = w->other;
4433
4434 ev_loop_fork (EV_A);
4435 ev_run (EV_A_ EVRUN_NOWAIT);
4436 }
4437
4438 ev_embed_start (EV_A_ w);
4439}
4440
4441#if 0
4442static void
4443embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4444{
4445 ev_idle_stop (EV_A_ idle);
4446}
4447#endif
4448
4449void
4450ev_embed_start (EV_P_ ev_embed *w) EV_THROW
4451{
4452 if (expect_false (ev_is_active (w)))
4453 return;
4454
4455 {
4456 EV_P = w->other;
4457 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4458 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4459 }
4460
4461 EV_FREQUENT_CHECK;
4462
4463 ev_set_priority (&w->io, ev_priority (w));
4464 ev_io_start (EV_A_ &w->io);
4465
4466 ev_prepare_init (&w->prepare, embed_prepare_cb);
4467 ev_set_priority (&w->prepare, EV_MINPRI);
4468 ev_prepare_start (EV_A_ &w->prepare);
4469
4470 ev_fork_init (&w->fork, embed_fork_cb);
4471 ev_fork_start (EV_A_ &w->fork);
4472
4473 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4474
4475 ev_start (EV_A_ (W)w, 1);
4476
4477 EV_FREQUENT_CHECK;
4478}
4479
4480void
4481ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
4482{
4483 clear_pending (EV_A_ (W)w);
4484 if (expect_false (!ev_is_active (w)))
4485 return;
4486
4487 EV_FREQUENT_CHECK;
4488
4489 ev_io_stop (EV_A_ &w->io);
4490 ev_prepare_stop (EV_A_ &w->prepare);
4491 ev_fork_stop (EV_A_ &w->fork);
4492
4493 ev_stop (EV_A_ (W)w);
4494
4495 EV_FREQUENT_CHECK;
4496}
4497#endif
4498
4499#if EV_FORK_ENABLE
4500void
4501ev_fork_start (EV_P_ ev_fork *w) EV_THROW
4502{
4503 if (expect_false (ev_is_active (w)))
4504 return;
4505
4506 EV_FREQUENT_CHECK;
4507
4508 ev_start (EV_A_ (W)w, ++forkcnt);
4509 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4510 forks [forkcnt - 1] = w;
4511
4512 EV_FREQUENT_CHECK;
4513}
4514
4515void
4516ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
4517{
4518 clear_pending (EV_A_ (W)w);
4519 if (expect_false (!ev_is_active (w)))
4520 return;
4521
4522 EV_FREQUENT_CHECK;
4523
4524 {
4525 int active = ev_active (w);
4526
4527 forks [active - 1] = forks [--forkcnt];
4528 ev_active (forks [active - 1]) = active;
4529 }
4530
4531 ev_stop (EV_A_ (W)w);
4532
4533 EV_FREQUENT_CHECK;
4534}
4535#endif
4536
4537#if EV_CLEANUP_ENABLE
4538void
4539ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
4540{
4541 if (expect_false (ev_is_active (w)))
4542 return;
4543
4544 EV_FREQUENT_CHECK;
4545
4546 ev_start (EV_A_ (W)w, ++cleanupcnt);
4547 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4548 cleanups [cleanupcnt - 1] = w;
4549
4550 /* cleanup watchers should never keep a refcount on the loop */
4551 ev_unref (EV_A);
4552 EV_FREQUENT_CHECK;
4553}
4554
4555void
4556ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
4557{
4558 clear_pending (EV_A_ (W)w);
4559 if (expect_false (!ev_is_active (w)))
4560 return;
4561
4562 EV_FREQUENT_CHECK;
4563 ev_ref (EV_A);
4564
4565 {
4566 int active = ev_active (w);
4567
4568 cleanups [active - 1] = cleanups [--cleanupcnt];
4569 ev_active (cleanups [active - 1]) = active;
4570 }
4571
4572 ev_stop (EV_A_ (W)w);
4573
4574 EV_FREQUENT_CHECK;
4575}
4576#endif
4577
4578#if EV_ASYNC_ENABLE
4579void
4580ev_async_start (EV_P_ ev_async *w) EV_THROW
4581{
4582 if (expect_false (ev_is_active (w)))
4583 return;
4584
4585 w->sent = 0;
4586
4587 evpipe_init (EV_A);
4588
4589 EV_FREQUENT_CHECK;
4590
4591 ev_start (EV_A_ (W)w, ++asynccnt);
4592 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4593 asyncs [asynccnt - 1] = w;
4594
4595 EV_FREQUENT_CHECK;
4596}
4597
4598void
4599ev_async_stop (EV_P_ ev_async *w) EV_THROW
4600{
4601 clear_pending (EV_A_ (W)w);
4602 if (expect_false (!ev_is_active (w)))
4603 return;
4604
4605 EV_FREQUENT_CHECK;
4606
4607 {
4608 int active = ev_active (w);
4609
4610 asyncs [active - 1] = asyncs [--asynccnt];
4611 ev_active (asyncs [active - 1]) = active;
4612 }
4613
4614 ev_stop (EV_A_ (W)w);
4615
4616 EV_FREQUENT_CHECK;
4617}
4618
4619void
4620ev_async_send (EV_P_ ev_async *w) EV_THROW
4621{
4622 w->sent = 1;
4623 evpipe_write (EV_A_ &async_pending);
4624}
4625#endif
4626
4627/*****************************************************************************/
4628
4629struct ev_once
4630{
4631 ev_io io;
4632 ev_timer to;
4633 void (*cb)(int revents, void *arg);
4634 void *arg;
4635};
4636
4637static void
4638once_cb (EV_P_ struct ev_once *once, int revents)
4639{
4640 void (*cb)(int revents, void *arg) = once->cb;
4641 void *arg = once->arg;
4642
4643 ev_io_stop (EV_A_ &once->io);
4644 ev_timer_stop (EV_A_ &once->to);
4645 ev_free (once);
4646
4647 cb (revents, arg);
4648}
4649
4650static void
4651once_cb_io (EV_P_ ev_io *w, int revents)
4652{
4653 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4654
4655 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4656}
4657
4658static void
4659once_cb_to (EV_P_ ev_timer *w, int revents)
4660{
4661 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4662
4663 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4664}
4665
4666void
4667ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
4668{
4669 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4670
4671 if (expect_false (!once))
4672 {
4673 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4674 return;
4675 }
4676
4677 once->cb = cb;
4678 once->arg = arg;
4679
4680 ev_init (&once->io, once_cb_io);
4681 if (fd >= 0)
4682 {
4683 ev_io_set (&once->io, fd, events);
4684 ev_io_start (EV_A_ &once->io);
4685 }
4686
4687 ev_init (&once->to, once_cb_to);
4688 if (timeout >= 0.)
4689 {
4690 ev_timer_set (&once->to, timeout, 0.);
4691 ev_timer_start (EV_A_ &once->to);
4692 }
4693}
4694
4695/*****************************************************************************/
4696
4697#if EV_WALK_ENABLE
4698void ecb_cold
4699ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
4700{
4701 int i, j;
4702 ev_watcher_list *wl, *wn;
4703
4704 if (types & (EV_IO | EV_EMBED))
4705 for (i = 0; i < anfdmax; ++i)
4706 for (wl = anfds [i].head; wl; )
500 { 4707 {
501 periodics_reschedule (ev_now - now); 4708 wn = wl->next;
502 4709
503 /* adjust timers. this is easy, as the offset is the same for all */ 4710#if EV_EMBED_ENABLE
504 for (i = 0; i < timercnt; ++i) 4711 if (ev_cb ((ev_io *)wl) == embed_io_cb)
505 timers [i]->at += diff; 4712 {
4713 if (types & EV_EMBED)
4714 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4715 }
4716 else
4717#endif
4718#if EV_USE_INOTIFY
4719 if (ev_cb ((ev_io *)wl) == infy_cb)
4720 ;
4721 else
4722#endif
4723 if ((ev_io *)wl != &pipe_w)
4724 if (types & EV_IO)
4725 cb (EV_A_ EV_IO, wl);
4726
4727 wl = wn;
506 } 4728 }
507 4729
508 now = ev_now; 4730 if (types & (EV_TIMER | EV_STAT))
509 } 4731 for (i = timercnt + HEAP0; i-- > HEAP0; )
510} 4732#if EV_STAT_ENABLE
511 4733 /*TODO: timer is not always active*/
512int ev_loop_done; 4734 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
513
514void ev_loop (int flags)
515{
516 double block;
517 ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;
518
519 if (checkcnt)
520 {
521 queue_events ((W *)checks, checkcnt, EV_CHECK);
522 call_pending ();
523 }
524
525 do
526 {
527 /* update fd-related kernel structures */
528 fd_reify ();
529
530 /* calculate blocking time */
531
532 /* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */
533 ev_now = ev_time ();
534
535 if (flags & EVLOOP_NONBLOCK || idlecnt)
536 block = 0.;
537 else
538 { 4735 {
539 block = MAX_BLOCKTIME; 4736 if (types & EV_STAT)
540 4737 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
541 if (timercnt)
542 {
543 ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
544 if (block > to) block = to;
545 }
546
547 if (periodiccnt)
548 {
549 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
550 if (block > to) block = to;
551 }
552
553 if (block < 0.) block = 0.;
554 }
555
556 method_poll (block);
557
558 /* update ev_now, do magic */
559 time_update ();
560
561 /* queue pending timers and reschedule them */
562 periodics_reify (); /* absolute timers first */
563 timers_reify (); /* relative timers second */
564
565 /* queue idle watchers unless io or timers are pending */
566 if (!pendingcnt)
567 queue_events ((W *)idles, idlecnt, EV_IDLE);
568
569 /* queue check and possibly idle watchers */
570 queue_events ((W *)checks, checkcnt, EV_CHECK);
571
572 call_pending ();
573 }
574 while (!ev_loop_done);
575
576 if (ev_loop_done != 2)
577 ev_loop_done = 0;
578}
579
580/*****************************************************************************/
581
582static void
583wlist_add (WL *head, WL elem)
584{
585 elem->next = *head;
586 *head = elem;
587}
588
589static void
590wlist_del (WL *head, WL elem)
591{
592 while (*head)
593 {
594 if (*head == elem)
595 {
596 *head = elem->next;
597 return;
598 }
599
600 head = &(*head)->next;
601 }
602}
603
604static void
605ev_start (W w, int active)
606{
607 w->pending = 0;
608 w->active = active;
609}
610
611static void
612ev_stop (W w)
613{
614 if (w->pending)
615 pendings [w->pending - 1].w = 0;
616
617 w->active = 0;
618}
619
620/*****************************************************************************/
621
622void
623evio_start (struct ev_io *w)
624{
625 if (ev_is_active (w))
626 return;
627
628 int fd = w->fd;
629
630 ev_start ((W)w, 1);
631 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
632 wlist_add ((WL *)&anfds[fd].head, (WL)w);
633
634 ++fdchangecnt;
635 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
636 fdchanges [fdchangecnt - 1] = fd;
637}
638
639void
640evio_stop (struct ev_io *w)
641{
642 if (!ev_is_active (w))
643 return;
644
645 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
646 ev_stop ((W)w);
647
648 ++fdchangecnt;
649 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
650 fdchanges [fdchangecnt - 1] = w->fd;
651}
652
653
654void
655evtimer_start (struct ev_timer *w)
656{
657 if (ev_is_active (w))
658 return;
659
660 w->at += now;
661
662 assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
663
664 ev_start ((W)w, ++timercnt);
665 array_needsize (timers, timermax, timercnt, );
666 timers [timercnt - 1] = w;
667 upheap ((WT *)timers, timercnt - 1);
668}
669
670void
671evtimer_stop (struct ev_timer *w)
672{
673 if (!ev_is_active (w))
674 return;
675
676 if (w->active < timercnt--)
677 {
678 timers [w->active - 1] = timers [timercnt];
679 downheap ((WT *)timers, timercnt, w->active - 1);
680 }
681
682 w->at = w->repeat;
683
684 ev_stop ((W)w);
685}
686
687void
688evtimer_again (struct ev_timer *w)
689{
690 if (ev_is_active (w))
691 {
692 if (w->repeat)
693 {
694 w->at = now + w->repeat;
695 downheap ((WT *)timers, timercnt, w->active - 1);
696 } 4738 }
697 else 4739 else
698 evtimer_stop (w); 4740#endif
699 } 4741 if (types & EV_TIMER)
700 else if (w->repeat) 4742 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
701 evtimer_start (w);
702}
703 4743
704void 4744#if EV_PERIODIC_ENABLE
705evperiodic_start (struct ev_periodic *w) 4745 if (types & EV_PERIODIC)
706{ 4746 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
707 if (ev_is_active (w)) 4747 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
708 return; 4748#endif
709 4749
710 assert (("periodic interval value less than zero not allowed", w->interval >= 0.)); 4750#if EV_IDLE_ENABLE
4751 if (types & EV_IDLE)
4752 for (j = NUMPRI; j--; )
4753 for (i = idlecnt [j]; i--; )
4754 cb (EV_A_ EV_IDLE, idles [j][i]);
4755#endif
711 4756
712 /* this formula differs from the one in periodic_reify because we do not always round up */ 4757#if EV_FORK_ENABLE
713 if (w->interval) 4758 if (types & EV_FORK)
714 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval; 4759 for (i = forkcnt; i--; )
4760 if (ev_cb (forks [i]) != embed_fork_cb)
4761 cb (EV_A_ EV_FORK, forks [i]);
4762#endif
715 4763
716 ev_start ((W)w, ++periodiccnt); 4764#if EV_ASYNC_ENABLE
717 array_needsize (periodics, periodicmax, periodiccnt, ); 4765 if (types & EV_ASYNC)
718 periodics [periodiccnt - 1] = w; 4766 for (i = asynccnt; i--; )
719 upheap ((WT *)periodics, periodiccnt - 1); 4767 cb (EV_A_ EV_ASYNC, asyncs [i]);
720} 4768#endif
721 4769
722void 4770#if EV_PREPARE_ENABLE
723evperiodic_stop (struct ev_periodic *w) 4771 if (types & EV_PREPARE)
724{ 4772 for (i = preparecnt; i--; )
725 if (!ev_is_active (w)) 4773# if EV_EMBED_ENABLE
726 return; 4774 if (ev_cb (prepares [i]) != embed_prepare_cb)
727
728 if (w->active < periodiccnt--)
729 {
730 periodics [w->active - 1] = periodics [periodiccnt];
731 downheap ((WT *)periodics, periodiccnt, w->active - 1);
732 }
733
734 ev_stop ((W)w);
735}
736
737void
738evsignal_start (struct ev_signal *w)
739{
740 if (ev_is_active (w))
741 return;
742
743 ev_start ((W)w, 1);
744 array_needsize (signals, signalmax, w->signum, signals_init);
745 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
746
747 if (!w->next)
748 {
749 struct sigaction sa;
750 sa.sa_handler = sighandler;
751 sigfillset (&sa.sa_mask);
752 sa.sa_flags = 0;
753 sigaction (w->signum, &sa, 0);
754 }
755}
756
757void
758evsignal_stop (struct ev_signal *w)
759{
760 if (!ev_is_active (w))
761 return;
762
763 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
764 ev_stop ((W)w);
765
766 if (!signals [w->signum - 1].head)
767 signal (w->signum, SIG_DFL);
768}
769
770void evidle_start (struct ev_idle *w)
771{
772 if (ev_is_active (w))
773 return;
774
775 ev_start ((W)w, ++idlecnt);
776 array_needsize (idles, idlemax, idlecnt, );
777 idles [idlecnt - 1] = w;
778}
779
780void evidle_stop (struct ev_idle *w)
781{
782 idles [w->active - 1] = idles [--idlecnt];
783 ev_stop ((W)w);
784}
785
786void evcheck_start (struct ev_check *w)
787{
788 if (ev_is_active (w))
789 return;
790
791 ev_start ((W)w, ++checkcnt);
792 array_needsize (checks, checkmax, checkcnt, );
793 checks [checkcnt - 1] = w;
794}
795
796void evcheck_stop (struct ev_check *w)
797{
798 checks [w->active - 1] = checks [--checkcnt];
799 ev_stop ((W)w);
800}
801
802/*****************************************************************************/
803
804#if 0
805
806struct ev_io wio;
807
808static void
809sin_cb (struct ev_io *w, int revents)
810{
811 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
812}
813
814static void
815ocb (struct ev_timer *w, int revents)
816{
817 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
818 evtimer_stop (w);
819 evtimer_start (w);
820}
821
822static void
823scb (struct ev_signal *w, int revents)
824{
825 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
826 evio_stop (&wio);
827 evio_start (&wio);
828}
829
830static void
831gcb (struct ev_signal *w, int revents)
832{
833 fprintf (stderr, "generic %x\n", revents);
834
835}
836
837int main (void)
838{
839 ev_init (0);
840
841 evio_init (&wio, sin_cb, 0, EV_READ);
842 evio_start (&wio);
843
844 struct ev_timer t[10000];
845
846#if 0
847 int i;
848 for (i = 0; i < 10000; ++i)
849 {
850 struct ev_timer *w = t + i;
851 evw_init (w, ocb, i);
852 evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
853 evtimer_start (w);
854 if (drand48 () < 0.5)
855 evtimer_stop (w);
856 }
857#endif 4775# endif
858 4776 cb (EV_A_ EV_PREPARE, prepares [i]);
859 struct ev_timer t1;
860 evtimer_init (&t1, ocb, 5, 10);
861 evtimer_start (&t1);
862
863 struct ev_signal sig;
864 evsignal_init (&sig, scb, SIGQUIT);
865 evsignal_start (&sig);
866
867 struct ev_check cw;
868 evcheck_init (&cw, gcb);
869 evcheck_start (&cw);
870
871 struct ev_idle iw;
872 evidle_init (&iw, gcb);
873 evidle_start (&iw);
874
875 ev_loop (0);
876
877 return 0;
878}
879
880#endif 4777#endif
881 4778
4779#if EV_CHECK_ENABLE
4780 if (types & EV_CHECK)
4781 for (i = checkcnt; i--; )
4782 cb (EV_A_ EV_CHECK, checks [i]);
4783#endif
882 4784
4785#if EV_SIGNAL_ENABLE
4786 if (types & EV_SIGNAL)
4787 for (i = 0; i < EV_NSIG - 1; ++i)
4788 for (wl = signals [i].head; wl; )
4789 {
4790 wn = wl->next;
4791 cb (EV_A_ EV_SIGNAL, wl);
4792 wl = wn;
4793 }
4794#endif
883 4795
4796#if EV_CHILD_ENABLE
4797 if (types & EV_CHILD)
4798 for (i = (EV_PID_HASHSIZE); i--; )
4799 for (wl = childs [i]; wl; )
4800 {
4801 wn = wl->next;
4802 cb (EV_A_ EV_CHILD, wl);
4803 wl = wn;
4804 }
4805#endif
4806/* EV_STAT 0x00001000 /* stat data changed */
4807/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4808}
4809#endif
884 4810
4811#if EV_MULTIPLICITY
4812 #include "ev_wrap.h"
4813#endif
4814

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