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Comparing libev/ev.c (file contents):
Revision 1.11 by root, Wed Oct 31 07:40:49 2007 UTC vs.
Revision 1.332 by root, Tue Mar 9 08:58:17 2010 UTC

1/*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010 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#ifdef __cplusplus
41extern "C" {
42#endif
43
44/* this big block deduces configuration from config.h */
45#ifndef EV_STANDALONE
46# ifdef EV_CONFIG_H
47# include EV_CONFIG_H
48# else
49# include "config.h"
50# endif
51
52# if HAVE_CLOCK_SYSCALL
53# ifndef EV_USE_CLOCK_SYSCALL
54# define EV_USE_CLOCK_SYSCALL 1
55# ifndef EV_USE_REALTIME
56# define EV_USE_REALTIME 0
57# endif
58# ifndef EV_USE_MONOTONIC
59# define EV_USE_MONOTONIC 1
60# endif
61# endif
62# elif !defined(EV_USE_CLOCK_SYSCALL)
63# define EV_USE_CLOCK_SYSCALL 0
64# endif
65
66# if HAVE_CLOCK_GETTIME
67# ifndef EV_USE_MONOTONIC
68# define EV_USE_MONOTONIC 1
69# endif
70# ifndef EV_USE_REALTIME
71# define EV_USE_REALTIME 0
72# endif
73# else
74# ifndef EV_USE_MONOTONIC
75# define EV_USE_MONOTONIC 0
76# endif
77# ifndef EV_USE_REALTIME
78# define EV_USE_REALTIME 0
79# endif
80# endif
81
82# ifndef EV_USE_NANOSLEEP
83# if HAVE_NANOSLEEP
84# define EV_USE_NANOSLEEP 1
85# else
86# define EV_USE_NANOSLEEP 0
87# endif
88# endif
89
90# ifndef EV_USE_SELECT
91# if HAVE_SELECT && HAVE_SYS_SELECT_H
92# define EV_USE_SELECT 1
93# else
94# define EV_USE_SELECT 0
95# endif
96# endif
97
98# ifndef EV_USE_POLL
99# if HAVE_POLL && HAVE_POLL_H
100# define EV_USE_POLL 1
101# else
102# define EV_USE_POLL 0
103# endif
104# endif
105
106# ifndef EV_USE_EPOLL
107# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
108# define EV_USE_EPOLL 1
109# else
110# define EV_USE_EPOLL 0
111# endif
112# endif
113
114# ifndef EV_USE_KQUEUE
115# if HAVE_KQUEUE && HAVE_SYS_EVENT_H
116# define EV_USE_KQUEUE 1
117# else
118# define EV_USE_KQUEUE 0
119# endif
120# endif
121
122# ifndef EV_USE_PORT
123# if HAVE_PORT_H && HAVE_PORT_CREATE
124# define EV_USE_PORT 1
125# else
126# define EV_USE_PORT 0
127# endif
128# endif
129
130# ifndef EV_USE_INOTIFY
131# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
132# define EV_USE_INOTIFY 1
133# else
134# define EV_USE_INOTIFY 0
135# endif
136# endif
137
138# ifndef EV_USE_SIGNALFD
139# if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
140# define EV_USE_SIGNALFD 1
141# else
142# define EV_USE_SIGNALFD 0
143# endif
144# endif
145
146# ifndef EV_USE_EVENTFD
147# if HAVE_EVENTFD
148# define EV_USE_EVENTFD 1
149# else
150# define EV_USE_EVENTFD 0
151# endif
152# endif
153
154#endif
155
1#include <math.h> 156#include <math.h>
2#include <stdlib.h> 157#include <stdlib.h>
3#include <unistd.h> 158#include <string.h>
4#include <fcntl.h> 159#include <fcntl.h>
5#include <signal.h> 160#include <stddef.h>
6 161
7#include <stdio.h> 162#include <stdio.h>
8 163
9#include <assert.h> 164#include <assert.h>
10#include <errno.h> 165#include <errno.h>
11#include <sys/time.h> 166#include <sys/types.h>
12#include <time.h> 167#include <time.h>
168#include <limits.h>
13 169
170#include <signal.h>
171
172#ifdef EV_H
173# include EV_H
174#else
175# include "ev.h"
176#endif
177
178#ifndef _WIN32
179# include <sys/time.h>
180# include <sys/wait.h>
181# include <unistd.h>
182#else
183# include <io.h>
184# define WIN32_LEAN_AND_MEAN
185# include <windows.h>
186# ifndef EV_SELECT_IS_WINSOCKET
187# define EV_SELECT_IS_WINSOCKET 1
188# endif
189# undef EV_AVOID_STDIO
190#endif
191
192/* this block tries to deduce configuration from header-defined symbols and defaults */
193
194/* try to deduce the maximum number of signals on this platform */
195#if defined (EV_NSIG)
196/* use what's provided */
197#elif defined (NSIG)
198# define EV_NSIG (NSIG)
199#elif defined(_NSIG)
200# define EV_NSIG (_NSIG)
201#elif defined (SIGMAX)
202# define EV_NSIG (SIGMAX+1)
203#elif defined (SIG_MAX)
204# define EV_NSIG (SIG_MAX+1)
205#elif defined (_SIG_MAX)
206# define EV_NSIG (_SIG_MAX+1)
207#elif defined (MAXSIG)
208# define EV_NSIG (MAXSIG+1)
209#elif defined (MAX_SIG)
210# define EV_NSIG (MAX_SIG+1)
211#elif defined (SIGARRAYSIZE)
212# define EV_NSIG SIGARRAYSIZE /* Assume ary[SIGARRAYSIZE] */
213#elif defined (_sys_nsig)
214# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
215#else
216# error "unable to find value for NSIG, please report"
217/* to make it compile regardless, just remove the above line */
218# define EV_NSIG 65
219#endif
220
221#ifndef EV_USE_CLOCK_SYSCALL
222# if __linux && __GLIBC__ >= 2
223# define EV_USE_CLOCK_SYSCALL 1
224# else
225# define EV_USE_CLOCK_SYSCALL 0
226# endif
227#endif
228
14#ifndef HAVE_MONOTONIC 229#ifndef EV_USE_MONOTONIC
230# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
231# define EV_USE_MONOTONIC 1
232# else
233# define EV_USE_MONOTONIC 0
234# endif
235#endif
236
237#ifndef EV_USE_REALTIME
238# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
239#endif
240
241#ifndef EV_USE_NANOSLEEP
242# if _POSIX_C_SOURCE >= 199309L
243# define EV_USE_NANOSLEEP 1
244# else
245# define EV_USE_NANOSLEEP 0
246# endif
247#endif
248
249#ifndef EV_USE_SELECT
250# define EV_USE_SELECT 1
251#endif
252
253#ifndef EV_USE_POLL
254# ifdef _WIN32
255# define EV_USE_POLL 0
256# else
257# define EV_USE_POLL 1
258# endif
259#endif
260
261#ifndef EV_USE_EPOLL
262# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
263# define EV_USE_EPOLL 1
264# else
265# define EV_USE_EPOLL 0
266# endif
267#endif
268
269#ifndef EV_USE_KQUEUE
270# define EV_USE_KQUEUE 0
271#endif
272
273#ifndef EV_USE_PORT
274# define EV_USE_PORT 0
275#endif
276
277#ifndef EV_USE_INOTIFY
278# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
279# define EV_USE_INOTIFY 1
280# else
281# define EV_USE_INOTIFY 0
282# endif
283#endif
284
285#ifndef EV_PID_HASHSIZE
286# if EV_MINIMAL
287# define EV_PID_HASHSIZE 1
288# else
289# define EV_PID_HASHSIZE 16
290# endif
291#endif
292
293#ifndef EV_INOTIFY_HASHSIZE
294# if EV_MINIMAL
295# define EV_INOTIFY_HASHSIZE 1
296# else
297# define EV_INOTIFY_HASHSIZE 16
298# endif
299#endif
300
301#ifndef EV_USE_EVENTFD
302# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
303# define EV_USE_EVENTFD 1
304# else
305# define EV_USE_EVENTFD 0
306# endif
307#endif
308
309#ifndef EV_USE_SIGNALFD
310# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
311# define EV_USE_SIGNALFD 1
312# else
313# define EV_USE_SIGNALFD 0
314# endif
315#endif
316
317#if 0 /* debugging */
318# define EV_VERIFY 3
319# define EV_USE_4HEAP 1
320# define EV_HEAP_CACHE_AT 1
321#endif
322
323#ifndef EV_VERIFY
324# define EV_VERIFY !EV_MINIMAL
325#endif
326
327#ifndef EV_USE_4HEAP
328# define EV_USE_4HEAP !EV_MINIMAL
329#endif
330
331#ifndef EV_HEAP_CACHE_AT
332# define EV_HEAP_CACHE_AT !EV_MINIMAL
333#endif
334
335/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
336/* which makes programs even slower. might work on other unices, too. */
337#if EV_USE_CLOCK_SYSCALL
338# include <syscall.h>
339# ifdef SYS_clock_gettime
340# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
341# undef EV_USE_MONOTONIC
342# define EV_USE_MONOTONIC 1
343# else
344# undef EV_USE_CLOCK_SYSCALL
345# define EV_USE_CLOCK_SYSCALL 0
346# endif
347#endif
348
349/* this block fixes any misconfiguration where we know we run into trouble otherwise */
350
351#ifdef _AIX
352/* AIX has a completely broken poll.h header */
353# undef EV_USE_POLL
354# define EV_USE_POLL 0
355#endif
356
15# ifdef CLOCK_MONOTONIC 357#ifndef CLOCK_MONOTONIC
358# undef EV_USE_MONOTONIC
16# define HAVE_MONOTONIC 1 359# define EV_USE_MONOTONIC 0
360#endif
361
362#ifndef CLOCK_REALTIME
363# undef EV_USE_REALTIME
364# define EV_USE_REALTIME 0
365#endif
366
367#if !EV_STAT_ENABLE
368# undef EV_USE_INOTIFY
369# define EV_USE_INOTIFY 0
370#endif
371
372#if !EV_USE_NANOSLEEP
373# ifndef _WIN32
374# include <sys/select.h>
375# endif
376#endif
377
378#if EV_USE_INOTIFY
379# include <sys/utsname.h>
380# include <sys/statfs.h>
381# include <sys/inotify.h>
382/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
383# ifndef IN_DONT_FOLLOW
384# undef EV_USE_INOTIFY
385# define EV_USE_INOTIFY 0
386# endif
387#endif
388
389#if EV_SELECT_IS_WINSOCKET
390# include <winsock.h>
391#endif
392
393#if EV_USE_EVENTFD
394/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
395# include <stdint.h>
396# ifndef EFD_NONBLOCK
397# define EFD_NONBLOCK O_NONBLOCK
398# endif
399# ifndef EFD_CLOEXEC
400# ifdef O_CLOEXEC
401# define EFD_CLOEXEC O_CLOEXEC
402# else
403# define EFD_CLOEXEC 02000000
17# endif 404# endif
18#endif 405# endif
19 406# ifdef __cplusplus
20#ifndef HAVE_SELECT 407extern "C" {
21# define HAVE_SELECT 1
22#endif 408# endif
23 409int (eventfd) (unsigned int initval, int flags);
24#ifndef HAVE_EPOLL 410# ifdef __cplusplus
25# define HAVE_EPOLL 0 411}
26#endif 412# endif
413#endif
27 414
28#ifndef HAVE_REALTIME 415#if EV_USE_SIGNALFD
29# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ 416/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
417# include <stdint.h>
418# ifndef SFD_NONBLOCK
419# define SFD_NONBLOCK O_NONBLOCK
30#endif 420# endif
421# ifndef SFD_CLOEXEC
422# ifdef O_CLOEXEC
423# define SFD_CLOEXEC O_CLOEXEC
424# else
425# define SFD_CLOEXEC 02000000
426# endif
427# endif
428# ifdef __cplusplus
429extern "C" {
430# endif
431int signalfd (int fd, const sigset_t *mask, int flags);
432
433struct signalfd_siginfo
434{
435 uint32_t ssi_signo;
436 char pad[128 - sizeof (uint32_t)];
437};
438# ifdef __cplusplus
439}
440# endif
441#endif
442
443
444/**/
445
446#if EV_VERIFY >= 3
447# define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
448#else
449# define EV_FREQUENT_CHECK do { } while (0)
450#endif
451
452/*
453 * This is used to avoid floating point rounding problems.
454 * It is added to ev_rt_now when scheduling periodics
455 * to ensure progress, time-wise, even when rounding
456 * errors are against us.
457 * This value is good at least till the year 4000.
458 * Better solutions welcome.
459 */
460#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
31 461
32#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 462#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
33#define MAX_BLOCKTIME 60. 463#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
34 464
35#include "ev.h" 465#if __GNUC__ >= 4
466# define expect(expr,value) __builtin_expect ((expr),(value))
467# define noinline __attribute__ ((noinline))
468#else
469# define expect(expr,value) (expr)
470# define noinline
471# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
472# define inline
473# endif
474#endif
36 475
37struct ev_watcher { 476#define expect_false(expr) expect ((expr) != 0, 0)
38 EV_WATCHER (ev_watcher); 477#define expect_true(expr) expect ((expr) != 0, 1)
39}; 478#define inline_size static inline
40 479
41struct ev_watcher_list { 480#if EV_MINIMAL
42 EV_WATCHER_LIST (ev_watcher_list); 481# define inline_speed static noinline
43}; 482#else
483# define inline_speed static inline
484#endif
44 485
486#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
487
488#if EV_MINPRI == EV_MAXPRI
489# define ABSPRI(w) (((W)w), 0)
490#else
491# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
492#endif
493
494#define EMPTY /* required for microsofts broken pseudo-c compiler */
495#define EMPTY2(a,b) /* used to suppress some warnings */
496
45typedef struct ev_watcher *W; 497typedef ev_watcher *W;
46typedef struct ev_watcher_list *WL; 498typedef ev_watcher_list *WL;
499typedef ev_watcher_time *WT;
47 500
48static ev_tstamp now, diff; /* monotonic clock */ 501#define ev_active(w) ((W)(w))->active
49ev_tstamp ev_now; 502#define ev_at(w) ((WT)(w))->at
50int ev_method;
51 503
52static int have_monotonic; /* runtime */ 504#if EV_USE_REALTIME
505/* sig_atomic_t is used to avoid per-thread variables or locking but still */
506/* giving it a reasonably high chance of working on typical architetcures */
507static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
508#endif
53 509
54static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 510#if EV_USE_MONOTONIC
55static void (*method_modify)(int fd, int oev, int nev); 511static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
56static void (*method_poll)(ev_tstamp timeout); 512#endif
513
514#ifndef EV_FD_TO_WIN32_HANDLE
515# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
516#endif
517#ifndef EV_WIN32_HANDLE_TO_FD
518# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
519#endif
520#ifndef EV_WIN32_CLOSE_FD
521# define EV_WIN32_CLOSE_FD(fd) close (fd)
522#endif
523
524#ifdef _WIN32
525# include "ev_win32.c"
526#endif
57 527
58/*****************************************************************************/ 528/*****************************************************************************/
59 529
530#if EV_AVOID_STDIO
531static void noinline
532ev_printerr (const char *msg)
533{
534 write (STDERR_FILENO, msg, strlen (msg));
535}
536#endif
537
538static void (*syserr_cb)(const char *msg);
539
540void
541ev_set_syserr_cb (void (*cb)(const char *msg))
542{
543 syserr_cb = cb;
544}
545
546static void noinline
547ev_syserr (const char *msg)
548{
549 if (!msg)
550 msg = "(libev) system error";
551
552 if (syserr_cb)
553 syserr_cb (msg);
554 else
555 {
556#if EV_AVOID_STDIO
557 const char *err = strerror (errno);
558
559 ev_printerr (msg);
560 ev_printerr (": ");
561 ev_printerr (err);
562 ev_printerr ("\n");
563#else
564 perror (msg);
565#endif
566 abort ();
567 }
568}
569
570static void *
571ev_realloc_emul (void *ptr, long size)
572{
573 /* some systems, notably openbsd and darwin, fail to properly
574 * implement realloc (x, 0) (as required by both ansi c-98 and
575 * the single unix specification, so work around them here.
576 */
577 if (size)
578 return realloc (ptr, size);
579
580 free (ptr);
581 return 0;
582}
583
584static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
585
586void
587ev_set_allocator (void *(*cb)(void *ptr, long size))
588{
589 alloc = cb;
590}
591
592inline_speed void *
593ev_realloc (void *ptr, long size)
594{
595 ptr = alloc (ptr, size);
596
597 if (!ptr && size)
598 {
599#if EV_AVOID_STDIO
600 ev_printerr ("libev: memory allocation failed, aborting.\n");
601#else
602 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
603#endif
604 abort ();
605 }
606
607 return ptr;
608}
609
610#define ev_malloc(size) ev_realloc (0, (size))
611#define ev_free(ptr) ev_realloc ((ptr), 0)
612
613/*****************************************************************************/
614
615/* set in reify when reification needed */
616#define EV_ANFD_REIFY 1
617
618/* file descriptor info structure */
619typedef struct
620{
621 WL head;
622 unsigned char events; /* the events watched for */
623 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
624 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
625 unsigned char unused;
626#if EV_USE_EPOLL
627 unsigned int egen; /* generation counter to counter epoll bugs */
628#endif
629#if EV_SELECT_IS_WINSOCKET
630 SOCKET handle;
631#endif
632} ANFD;
633
634/* stores the pending event set for a given watcher */
635typedef struct
636{
637 W w;
638 int events; /* the pending event set for the given watcher */
639} ANPENDING;
640
641#if EV_USE_INOTIFY
642/* hash table entry per inotify-id */
643typedef struct
644{
645 WL head;
646} ANFS;
647#endif
648
649/* Heap Entry */
650#if EV_HEAP_CACHE_AT
651 /* a heap element */
652 typedef struct {
653 ev_tstamp at;
654 WT w;
655 } ANHE;
656
657 #define ANHE_w(he) (he).w /* access watcher, read-write */
658 #define ANHE_at(he) (he).at /* access cached at, read-only */
659 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
660#else
661 /* a heap element */
662 typedef WT ANHE;
663
664 #define ANHE_w(he) (he)
665 #define ANHE_at(he) (he)->at
666 #define ANHE_at_cache(he)
667#endif
668
669#if EV_MULTIPLICITY
670
671 struct ev_loop
672 {
673 ev_tstamp ev_rt_now;
674 #define ev_rt_now ((loop)->ev_rt_now)
675 #define VAR(name,decl) decl;
676 #include "ev_vars.h"
677 #undef VAR
678 };
679 #include "ev_wrap.h"
680
681 static struct ev_loop default_loop_struct;
682 struct ev_loop *ev_default_loop_ptr;
683
684#else
685
686 ev_tstamp ev_rt_now;
687 #define VAR(name,decl) static decl;
688 #include "ev_vars.h"
689 #undef VAR
690
691 static int ev_default_loop_ptr;
692
693#endif
694
695#if EV_MINIMAL < 2
696# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
697# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
698# define EV_INVOKE_PENDING invoke_cb (EV_A)
699#else
700# define EV_RELEASE_CB (void)0
701# define EV_ACQUIRE_CB (void)0
702# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
703#endif
704
705#define EVUNLOOP_RECURSE 0x80
706
707/*****************************************************************************/
708
709#ifndef EV_HAVE_EV_TIME
60ev_tstamp 710ev_tstamp
61ev_time (void) 711ev_time (void)
62{ 712{
63#if HAVE_REALTIME 713#if EV_USE_REALTIME
714 if (expect_true (have_realtime))
715 {
64 struct timespec ts; 716 struct timespec ts;
65 clock_gettime (CLOCK_REALTIME, &ts); 717 clock_gettime (CLOCK_REALTIME, &ts);
66 return ts.tv_sec + ts.tv_nsec * 1e-9; 718 return ts.tv_sec + ts.tv_nsec * 1e-9;
67#else 719 }
720#endif
721
68 struct timeval tv; 722 struct timeval tv;
69 gettimeofday (&tv, 0); 723 gettimeofday (&tv, 0);
70 return tv.tv_sec + tv.tv_usec * 1e-6; 724 return tv.tv_sec + tv.tv_usec * 1e-6;
71#endif
72} 725}
726#endif
73 727
74static ev_tstamp 728inline_size ev_tstamp
75get_clock (void) 729get_clock (void)
76{ 730{
77#if HAVE_MONOTONIC 731#if EV_USE_MONOTONIC
78 if (have_monotonic) 732 if (expect_true (have_monotonic))
79 { 733 {
80 struct timespec ts; 734 struct timespec ts;
81 clock_gettime (CLOCK_MONOTONIC, &ts); 735 clock_gettime (CLOCK_MONOTONIC, &ts);
82 return ts.tv_sec + ts.tv_nsec * 1e-9; 736 return ts.tv_sec + ts.tv_nsec * 1e-9;
83 } 737 }
84#endif 738#endif
85 739
86 return ev_time (); 740 return ev_time ();
87} 741}
88 742
89#define array_needsize(base,cur,cnt,init) \ 743#if EV_MULTIPLICITY
90 if ((cnt) > cur) \ 744ev_tstamp
91 { \ 745ev_now (EV_P)
92 int newcnt = cur ? cur << 1 : 16; \ 746{
93 fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ 747 return ev_rt_now;
94 base = realloc (base, sizeof (*base) * (newcnt)); \ 748}
95 init (base + cur, newcnt - cur); \ 749#endif
96 cur = newcnt; \ 750
751void
752ev_sleep (ev_tstamp delay)
753{
754 if (delay > 0.)
97 } 755 {
756#if EV_USE_NANOSLEEP
757 struct timespec ts;
758
759 ts.tv_sec = (time_t)delay;
760 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
761
762 nanosleep (&ts, 0);
763#elif defined(_WIN32)
764 Sleep ((unsigned long)(delay * 1e3));
765#else
766 struct timeval tv;
767
768 tv.tv_sec = (time_t)delay;
769 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
770
771 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
772 /* something not guaranteed by newer posix versions, but guaranteed */
773 /* by older ones */
774 select (0, 0, 0, 0, &tv);
775#endif
776 }
777}
98 778
99/*****************************************************************************/ 779/*****************************************************************************/
100 780
101typedef struct 781#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
102{
103 struct ev_io *head;
104 unsigned char wev, rev; /* want, received event set */
105} ANFD;
106 782
107static ANFD *anfds; 783/* find a suitable new size for the given array, */
108static int anfdmax; 784/* hopefully by rounding to a ncie-to-malloc size */
109 785inline_size int
110static int *fdchanges; 786array_nextsize (int elem, int cur, int cnt)
111static int fdchangemax, fdchangecnt;
112
113static void
114anfds_init (ANFD *base, int count)
115{ 787{
116 while (count--) 788 int ncur = cur + 1;
117 { 789
118 base->head = 0; 790 do
119 base->wev = base->rev = EV_NONE; 791 ncur <<= 1;
120 ++base; 792 while (cnt > ncur);
793
794 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
795 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
121 } 796 {
122} 797 ncur *= elem;
798 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
799 ncur = ncur - sizeof (void *) * 4;
800 ncur /= elem;
801 }
123 802
124typedef struct 803 return ncur;
125{ 804}
126 W w;
127 int events;
128} ANPENDING;
129 805
130static ANPENDING *pendings; 806static noinline void *
131static int pendingmax, pendingcnt; 807array_realloc (int elem, void *base, int *cur, int cnt)
132
133static void
134event (W w, int events)
135{ 808{
136 w->pending = ++pendingcnt; 809 *cur = array_nextsize (elem, *cur, cnt);
137 array_needsize (pendings, pendingmax, pendingcnt, ); 810 return ev_realloc (base, elem * *cur);
138 pendings [pendingcnt - 1].w = w; 811}
812
813#define array_init_zero(base,count) \
814 memset ((void *)(base), 0, sizeof (*(base)) * (count))
815
816#define array_needsize(type,base,cur,cnt,init) \
817 if (expect_false ((cnt) > (cur))) \
818 { \
819 int ocur_ = (cur); \
820 (base) = (type *)array_realloc \
821 (sizeof (type), (base), &(cur), (cnt)); \
822 init ((base) + (ocur_), (cur) - ocur_); \
823 }
824
825#if 0
826#define array_slim(type,stem) \
827 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
828 { \
829 stem ## max = array_roundsize (stem ## cnt >> 1); \
830 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
831 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
832 }
833#endif
834
835#define array_free(stem, idx) \
836 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
837
838/*****************************************************************************/
839
840/* dummy callback for pending events */
841static void noinline
842pendingcb (EV_P_ ev_prepare *w, int revents)
843{
844}
845
846void noinline
847ev_feed_event (EV_P_ void *w, int revents)
848{
849 W w_ = (W)w;
850 int pri = ABSPRI (w_);
851
852 if (expect_false (w_->pending))
139 pendings [pendingcnt - 1].events = events; 853 pendings [pri][w_->pending - 1].events |= revents;
854 else
855 {
856 w_->pending = ++pendingcnt [pri];
857 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
858 pendings [pri][w_->pending - 1].w = w_;
859 pendings [pri][w_->pending - 1].events = revents;
860 }
140} 861}
141 862
142static void 863inline_speed void
864feed_reverse (EV_P_ W w)
865{
866 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
867 rfeeds [rfeedcnt++] = w;
868}
869
870inline_size void
871feed_reverse_done (EV_P_ int revents)
872{
873 do
874 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
875 while (rfeedcnt);
876}
877
878inline_speed void
879queue_events (EV_P_ W *events, int eventcnt, int type)
880{
881 int i;
882
883 for (i = 0; i < eventcnt; ++i)
884 ev_feed_event (EV_A_ events [i], type);
885}
886
887/*****************************************************************************/
888
889inline_speed void
143fd_event (int fd, int events) 890fd_event_nc (EV_P_ int fd, int revents)
144{ 891{
145 ANFD *anfd = anfds + fd; 892 ANFD *anfd = anfds + fd;
146 struct ev_io *w; 893 ev_io *w;
147 894
148 for (w = anfd->head; w; w = w->next) 895 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
149 { 896 {
150 int ev = w->events & events; 897 int ev = w->events & revents;
151 898
152 if (ev) 899 if (ev)
153 event ((W)w, ev); 900 ev_feed_event (EV_A_ (W)w, ev);
154 }
155}
156
157static void
158queue_events (W *events, int eventcnt, int type)
159{
160 int i;
161
162 for (i = 0; i < eventcnt; ++i)
163 event (events [i], type);
164}
165
166/*****************************************************************************/
167
168static struct ev_timer **atimers;
169static int atimermax, atimercnt;
170
171static struct ev_timer **rtimers;
172static int rtimermax, rtimercnt;
173
174static void
175upheap (struct ev_timer **timers, int k)
176{
177 struct ev_timer *w = timers [k];
178
179 while (k && timers [k >> 1]->at > w->at)
180 {
181 timers [k] = timers [k >> 1];
182 timers [k]->active = k + 1;
183 k >>= 1;
184 }
185
186 timers [k] = w;
187 timers [k]->active = k + 1;
188
189}
190
191static void
192downheap (struct ev_timer **timers, int N, int k)
193{
194 struct ev_timer *w = timers [k];
195
196 while (k < (N >> 1))
197 {
198 int j = k << 1;
199
200 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
201 ++j;
202
203 if (w->at <= timers [j]->at)
204 break;
205
206 timers [k] = timers [j];
207 timers [k]->active = k + 1;
208 k = j;
209 }
210
211 timers [k] = w;
212 timers [k]->active = k + 1;
213}
214
215/*****************************************************************************/
216
217typedef struct
218{
219 struct ev_signal *head;
220 sig_atomic_t gotsig;
221} ANSIG;
222
223static ANSIG *signals;
224static int signalmax;
225
226static int sigpipe [2];
227static sig_atomic_t gotsig;
228static struct ev_io sigev;
229
230static void
231signals_init (ANSIG *base, int count)
232{
233 while (count--)
234 {
235 base->head = 0;
236 base->gotsig = 0;
237 ++base;
238 }
239}
240
241static void
242sighandler (int signum)
243{
244 signals [signum - 1].gotsig = 1;
245
246 if (!gotsig)
247 {
248 gotsig = 1;
249 write (sigpipe [1], &gotsig, 1);
250 }
251}
252
253static void
254sigcb (struct ev_io *iow, int revents)
255{
256 struct ev_signal *w;
257 int sig;
258
259 gotsig = 0;
260 read (sigpipe [0], &revents, 1);
261
262 for (sig = signalmax; sig--; )
263 if (signals [sig].gotsig)
264 {
265 signals [sig].gotsig = 0;
266
267 for (w = signals [sig].head; w; w = w->next)
268 event ((W)w, EV_SIGNAL);
269 } 901 }
270} 902}
271 903
272static void 904/* do not submit kernel events for fds that have reify set */
273siginit (void) 905/* because that means they changed while we were polling for new events */
906inline_speed void
907fd_event (EV_P_ int fd, int revents)
274{ 908{
275 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); 909 ANFD *anfd = anfds + fd;
276 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277 910
278 /* rather than sort out wether we really need nb, set it */ 911 if (expect_true (!anfd->reify))
279 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 912 fd_event_nc (EV_A_ fd, revents);
280 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
281
282 evio_set (&sigev, sigpipe [0], EV_READ);
283 evio_start (&sigev);
284} 913}
285 914
286/*****************************************************************************/ 915void
287 916ev_feed_fd_event (EV_P_ int fd, int revents)
288static struct ev_idle **idles;
289static int idlemax, idlecnt;
290
291static struct ev_check **checks;
292static int checkmax, checkcnt;
293
294/*****************************************************************************/
295
296#if HAVE_EPOLL
297# include "ev_epoll.c"
298#endif
299#if HAVE_SELECT
300# include "ev_select.c"
301#endif
302
303int ev_init (int flags)
304{ 917{
305#if HAVE_MONOTONIC 918 if (fd >= 0 && fd < anfdmax)
306 { 919 fd_event_nc (EV_A_ fd, revents);
307 struct timespec ts;
308 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309 have_monotonic = 1;
310 }
311#endif
312
313 ev_now = ev_time ();
314 now = get_clock ();
315 diff = ev_now - now;
316
317 if (pipe (sigpipe))
318 return 0;
319
320 ev_method = EVMETHOD_NONE;
321#if HAVE_EPOLL
322 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
323#endif
324#if HAVE_SELECT
325 if (ev_method == EVMETHOD_NONE) select_init (flags);
326#endif
327
328 if (ev_method)
329 {
330 evw_init (&sigev, sigcb, 0);
331 siginit ();
332 }
333
334 return ev_method;
335} 920}
336 921
337/*****************************************************************************/ 922/* make sure the external fd watch events are in-sync */
338 923/* with the kernel/libev internal state */
339void ev_prefork (void) 924inline_size void
340{ 925fd_reify (EV_P)
341 /* nop */
342}
343
344void ev_postfork_parent (void)
345{
346 /* nop */
347}
348
349void ev_postfork_child (void)
350{
351#if HAVE_EPOLL
352 if (ev_method == EVMETHOD_EPOLL)
353 epoll_postfork_child ();
354#endif
355
356 evio_stop (&sigev);
357 close (sigpipe [0]);
358 close (sigpipe [1]);
359 pipe (sigpipe);
360 siginit ();
361}
362
363/*****************************************************************************/
364
365static void
366fd_reify (void)
367{ 926{
368 int i; 927 int i;
369 928
370 for (i = 0; i < fdchangecnt; ++i) 929 for (i = 0; i < fdchangecnt; ++i)
371 { 930 {
372 int fd = fdchanges [i]; 931 int fd = fdchanges [i];
373 ANFD *anfd = anfds + fd; 932 ANFD *anfd = anfds + fd;
374 struct ev_io *w; 933 ev_io *w;
375 934
376 int wev = 0; 935 unsigned char events = 0;
377 936
378 for (w = anfd->head; w; w = w->next) 937 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
379 wev |= w->events; 938 events |= (unsigned char)w->events;
380 939
381 if (anfd->wev != wev) 940#if EV_SELECT_IS_WINSOCKET
941 if (events)
382 { 942 {
383 method_modify (fd, anfd->wev, wev); 943 unsigned long arg;
384 anfd->wev = wev; 944 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
945 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
385 } 946 }
947#endif
948
949 {
950 unsigned char o_events = anfd->events;
951 unsigned char o_reify = anfd->reify;
952
953 anfd->reify = 0;
954 anfd->events = events;
955
956 if (o_events != events || o_reify & EV__IOFDSET)
957 backend_modify (EV_A_ fd, o_events, events);
958 }
386 } 959 }
387 960
388 fdchangecnt = 0; 961 fdchangecnt = 0;
389} 962}
390 963
964/* something about the given fd changed */
965inline_size void
966fd_change (EV_P_ int fd, int flags)
967{
968 unsigned char reify = anfds [fd].reify;
969 anfds [fd].reify |= flags;
970
971 if (expect_true (!reify))
972 {
973 ++fdchangecnt;
974 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
975 fdchanges [fdchangecnt - 1] = fd;
976 }
977}
978
979/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
980inline_speed void
981fd_kill (EV_P_ int fd)
982{
983 ev_io *w;
984
985 while ((w = (ev_io *)anfds [fd].head))
986 {
987 ev_io_stop (EV_A_ w);
988 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
989 }
990}
991
992/* check whether the given fd is atcually valid, for error recovery */
993inline_size int
994fd_valid (int fd)
995{
996#ifdef _WIN32
997 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
998#else
999 return fcntl (fd, F_GETFD) != -1;
1000#endif
1001}
1002
1003/* called on EBADF to verify fds */
1004static void noinline
1005fd_ebadf (EV_P)
1006{
1007 int fd;
1008
1009 for (fd = 0; fd < anfdmax; ++fd)
1010 if (anfds [fd].events)
1011 if (!fd_valid (fd) && errno == EBADF)
1012 fd_kill (EV_A_ fd);
1013}
1014
1015/* called on ENOMEM in select/poll to kill some fds and retry */
1016static void noinline
1017fd_enomem (EV_P)
1018{
1019 int fd;
1020
1021 for (fd = anfdmax; fd--; )
1022 if (anfds [fd].events)
1023 {
1024 fd_kill (EV_A_ fd);
1025 break;
1026 }
1027}
1028
1029/* usually called after fork if backend needs to re-arm all fds from scratch */
1030static void noinline
1031fd_rearm_all (EV_P)
1032{
1033 int fd;
1034
1035 for (fd = 0; fd < anfdmax; ++fd)
1036 if (anfds [fd].events)
1037 {
1038 anfds [fd].events = 0;
1039 anfds [fd].emask = 0;
1040 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1041 }
1042}
1043
1044/*****************************************************************************/
1045
1046/*
1047 * the heap functions want a real array index. array index 0 uis guaranteed to not
1048 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1049 * the branching factor of the d-tree.
1050 */
1051
1052/*
1053 * at the moment we allow libev the luxury of two heaps,
1054 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1055 * which is more cache-efficient.
1056 * the difference is about 5% with 50000+ watchers.
1057 */
1058#if EV_USE_4HEAP
1059
1060#define DHEAP 4
1061#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1062#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1063#define UPHEAP_DONE(p,k) ((p) == (k))
1064
1065/* away from the root */
1066inline_speed void
1067downheap (ANHE *heap, int N, int k)
1068{
1069 ANHE he = heap [k];
1070 ANHE *E = heap + N + HEAP0;
1071
1072 for (;;)
1073 {
1074 ev_tstamp minat;
1075 ANHE *minpos;
1076 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1077
1078 /* find minimum child */
1079 if (expect_true (pos + DHEAP - 1 < E))
1080 {
1081 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1082 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1083 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1084 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1085 }
1086 else if (pos < E)
1087 {
1088 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1089 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1090 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1091 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1092 }
1093 else
1094 break;
1095
1096 if (ANHE_at (he) <= minat)
1097 break;
1098
1099 heap [k] = *minpos;
1100 ev_active (ANHE_w (*minpos)) = k;
1101
1102 k = minpos - heap;
1103 }
1104
1105 heap [k] = he;
1106 ev_active (ANHE_w (he)) = k;
1107}
1108
1109#else /* 4HEAP */
1110
1111#define HEAP0 1
1112#define HPARENT(k) ((k) >> 1)
1113#define UPHEAP_DONE(p,k) (!(p))
1114
1115/* away from the root */
1116inline_speed void
1117downheap (ANHE *heap, int N, int k)
1118{
1119 ANHE he = heap [k];
1120
1121 for (;;)
1122 {
1123 int c = k << 1;
1124
1125 if (c >= N + HEAP0)
1126 break;
1127
1128 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1129 ? 1 : 0;
1130
1131 if (ANHE_at (he) <= ANHE_at (heap [c]))
1132 break;
1133
1134 heap [k] = heap [c];
1135 ev_active (ANHE_w (heap [k])) = k;
1136
1137 k = c;
1138 }
1139
1140 heap [k] = he;
1141 ev_active (ANHE_w (he)) = k;
1142}
1143#endif
1144
1145/* towards the root */
1146inline_speed void
1147upheap (ANHE *heap, int k)
1148{
1149 ANHE he = heap [k];
1150
1151 for (;;)
1152 {
1153 int p = HPARENT (k);
1154
1155 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1156 break;
1157
1158 heap [k] = heap [p];
1159 ev_active (ANHE_w (heap [k])) = k;
1160 k = p;
1161 }
1162
1163 heap [k] = he;
1164 ev_active (ANHE_w (he)) = k;
1165}
1166
1167/* move an element suitably so it is in a correct place */
1168inline_size void
1169adjustheap (ANHE *heap, int N, int k)
1170{
1171 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1172 upheap (heap, k);
1173 else
1174 downheap (heap, N, k);
1175}
1176
1177/* rebuild the heap: this function is used only once and executed rarely */
1178inline_size void
1179reheap (ANHE *heap, int N)
1180{
1181 int i;
1182
1183 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1184 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1185 for (i = 0; i < N; ++i)
1186 upheap (heap, i + HEAP0);
1187}
1188
1189/*****************************************************************************/
1190
1191/* associate signal watchers to a signal signal */
1192typedef struct
1193{
1194 EV_ATOMIC_T pending;
1195#if EV_MULTIPLICITY
1196 EV_P;
1197#endif
1198 WL head;
1199} ANSIG;
1200
1201static ANSIG signals [EV_NSIG - 1];
1202
1203/*****************************************************************************/
1204
1205/* used to prepare libev internal fd's */
1206/* this is not fork-safe */
1207inline_speed void
1208fd_intern (int fd)
1209{
1210#ifdef _WIN32
1211 unsigned long arg = 1;
1212 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1213#else
1214 fcntl (fd, F_SETFD, FD_CLOEXEC);
1215 fcntl (fd, F_SETFL, O_NONBLOCK);
1216#endif
1217}
1218
1219static void noinline
1220evpipe_init (EV_P)
1221{
1222 if (!ev_is_active (&pipe_w))
1223 {
1224#if EV_USE_EVENTFD
1225 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1226 if (evfd < 0 && errno == EINVAL)
1227 evfd = eventfd (0, 0);
1228
1229 if (evfd >= 0)
1230 {
1231 evpipe [0] = -1;
1232 fd_intern (evfd); /* doing it twice doesn't hurt */
1233 ev_io_set (&pipe_w, evfd, EV_READ);
1234 }
1235 else
1236#endif
1237 {
1238 while (pipe (evpipe))
1239 ev_syserr ("(libev) error creating signal/async pipe");
1240
1241 fd_intern (evpipe [0]);
1242 fd_intern (evpipe [1]);
1243 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1244 }
1245
1246 ev_io_start (EV_A_ &pipe_w);
1247 ev_unref (EV_A); /* watcher should not keep loop alive */
1248 }
1249}
1250
1251inline_size void
1252evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1253{
1254 if (!*flag)
1255 {
1256 int old_errno = errno; /* save errno because write might clobber it */
1257
1258 *flag = 1;
1259
1260#if EV_USE_EVENTFD
1261 if (evfd >= 0)
1262 {
1263 uint64_t counter = 1;
1264 write (evfd, &counter, sizeof (uint64_t));
1265 }
1266 else
1267#endif
1268 write (evpipe [1], &old_errno, 1);
1269
1270 errno = old_errno;
1271 }
1272}
1273
1274/* called whenever the libev signal pipe */
1275/* got some events (signal, async) */
391static void 1276static void
392call_pending () 1277pipecb (EV_P_ ev_io *iow, int revents)
393{ 1278{
394 int i; 1279 int i;
395 1280
396 for (i = 0; i < pendingcnt; ++i) 1281#if EV_USE_EVENTFD
1282 if (evfd >= 0)
1283 {
1284 uint64_t counter;
1285 read (evfd, &counter, sizeof (uint64_t));
397 { 1286 }
398 ANPENDING *p = pendings + i; 1287 else
1288#endif
1289 {
1290 char dummy;
1291 read (evpipe [0], &dummy, 1);
1292 }
399 1293
400 if (p->w) 1294 if (sig_pending)
1295 {
1296 sig_pending = 0;
1297
1298 for (i = EV_NSIG - 1; i--; )
1299 if (expect_false (signals [i].pending))
1300 ev_feed_signal_event (EV_A_ i + 1);
1301 }
1302
1303#if EV_ASYNC_ENABLE
1304 if (async_pending)
1305 {
1306 async_pending = 0;
1307
1308 for (i = asynccnt; i--; )
1309 if (asyncs [i]->sent)
1310 {
1311 asyncs [i]->sent = 0;
1312 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1313 }
1314 }
1315#endif
1316}
1317
1318/*****************************************************************************/
1319
1320static void
1321ev_sighandler (int signum)
1322{
1323#if EV_MULTIPLICITY
1324 EV_P = signals [signum - 1].loop;
1325#endif
1326
1327#ifdef _WIN32
1328 signal (signum, ev_sighandler);
1329#endif
1330
1331 signals [signum - 1].pending = 1;
1332 evpipe_write (EV_A_ &sig_pending);
1333}
1334
1335void noinline
1336ev_feed_signal_event (EV_P_ int signum)
1337{
1338 WL w;
1339
1340 if (expect_false (signum <= 0 || signum > EV_NSIG))
1341 return;
1342
1343 --signum;
1344
1345#if EV_MULTIPLICITY
1346 /* it is permissible to try to feed a signal to the wrong loop */
1347 /* or, likely more useful, feeding a signal nobody is waiting for */
1348
1349 if (expect_false (signals [signum].loop != EV_A))
1350 return;
1351#endif
1352
1353 signals [signum].pending = 0;
1354
1355 for (w = signals [signum].head; w; w = w->next)
1356 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1357}
1358
1359#if EV_USE_SIGNALFD
1360static void
1361sigfdcb (EV_P_ ev_io *iow, int revents)
1362{
1363 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1364
1365 for (;;)
1366 {
1367 ssize_t res = read (sigfd, si, sizeof (si));
1368
1369 /* not ISO-C, as res might be -1, but works with SuS */
1370 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1371 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1372
1373 if (res < (ssize_t)sizeof (si))
1374 break;
1375 }
1376}
1377#endif
1378
1379/*****************************************************************************/
1380
1381static WL childs [EV_PID_HASHSIZE];
1382
1383#ifndef _WIN32
1384
1385static ev_signal childev;
1386
1387#ifndef WIFCONTINUED
1388# define WIFCONTINUED(status) 0
1389#endif
1390
1391/* handle a single child status event */
1392inline_speed void
1393child_reap (EV_P_ int chain, int pid, int status)
1394{
1395 ev_child *w;
1396 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1397
1398 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1399 {
1400 if ((w->pid == pid || !w->pid)
1401 && (!traced || (w->flags & 1)))
401 { 1402 {
402 p->w->pending = 0; 1403 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
403 p->w->cb (p->w, p->events); 1404 w->rpid = pid;
1405 w->rstatus = status;
1406 ev_feed_event (EV_A_ (W)w, EV_CHILD);
404 } 1407 }
405 } 1408 }
406
407 pendingcnt = 0;
408} 1409}
409 1410
1411#ifndef WCONTINUED
1412# define WCONTINUED 0
1413#endif
1414
1415/* called on sigchld etc., calls waitpid */
410static void 1416static void
411timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now) 1417childcb (EV_P_ ev_signal *sw, int revents)
412{ 1418{
413 while (timercnt && timers [0]->at <= now) 1419 int pid, status;
1420
1421 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1422 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1423 if (!WCONTINUED
1424 || errno != EINVAL
1425 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1426 return;
1427
1428 /* make sure we are called again until all children have been reaped */
1429 /* we need to do it this way so that the callback gets called before we continue */
1430 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1431
1432 child_reap (EV_A_ pid, pid, status);
1433 if (EV_PID_HASHSIZE > 1)
1434 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1435}
1436
1437#endif
1438
1439/*****************************************************************************/
1440
1441#if EV_USE_PORT
1442# include "ev_port.c"
1443#endif
1444#if EV_USE_KQUEUE
1445# include "ev_kqueue.c"
1446#endif
1447#if EV_USE_EPOLL
1448# include "ev_epoll.c"
1449#endif
1450#if EV_USE_POLL
1451# include "ev_poll.c"
1452#endif
1453#if EV_USE_SELECT
1454# include "ev_select.c"
1455#endif
1456
1457int
1458ev_version_major (void)
1459{
1460 return EV_VERSION_MAJOR;
1461}
1462
1463int
1464ev_version_minor (void)
1465{
1466 return EV_VERSION_MINOR;
1467}
1468
1469/* return true if we are running with elevated privileges and should ignore env variables */
1470int inline_size
1471enable_secure (void)
1472{
1473#ifdef _WIN32
1474 return 0;
1475#else
1476 return getuid () != geteuid ()
1477 || getgid () != getegid ();
1478#endif
1479}
1480
1481unsigned int
1482ev_supported_backends (void)
1483{
1484 unsigned int flags = 0;
1485
1486 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1487 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1488 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1489 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1490 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1491
1492 return flags;
1493}
1494
1495unsigned int
1496ev_recommended_backends (void)
1497{
1498 unsigned int flags = ev_supported_backends ();
1499
1500#ifndef __NetBSD__
1501 /* kqueue is borked on everything but netbsd apparently */
1502 /* it usually doesn't work correctly on anything but sockets and pipes */
1503 flags &= ~EVBACKEND_KQUEUE;
1504#endif
1505#ifdef __APPLE__
1506 /* only select works correctly on that "unix-certified" platform */
1507 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1508 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1509#endif
1510
1511 return flags;
1512}
1513
1514unsigned int
1515ev_embeddable_backends (void)
1516{
1517 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1518
1519 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1520 /* please fix it and tell me how to detect the fix */
1521 flags &= ~EVBACKEND_EPOLL;
1522
1523 return flags;
1524}
1525
1526unsigned int
1527ev_backend (EV_P)
1528{
1529 return backend;
1530}
1531
1532#if EV_MINIMAL < 2
1533unsigned int
1534ev_loop_count (EV_P)
1535{
1536 return loop_count;
1537}
1538
1539unsigned int
1540ev_loop_depth (EV_P)
1541{
1542 return loop_depth;
1543}
1544
1545void
1546ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1547{
1548 io_blocktime = interval;
1549}
1550
1551void
1552ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1553{
1554 timeout_blocktime = interval;
1555}
1556
1557void
1558ev_set_userdata (EV_P_ void *data)
1559{
1560 userdata = data;
1561}
1562
1563void *
1564ev_userdata (EV_P)
1565{
1566 return userdata;
1567}
1568
1569void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1570{
1571 invoke_cb = invoke_pending_cb;
1572}
1573
1574void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1575{
1576 release_cb = release;
1577 acquire_cb = acquire;
1578}
1579#endif
1580
1581/* initialise a loop structure, must be zero-initialised */
1582static void noinline
1583loop_init (EV_P_ unsigned int flags)
1584{
1585 if (!backend)
1586 {
1587#if EV_USE_REALTIME
1588 if (!have_realtime)
1589 {
1590 struct timespec ts;
1591
1592 if (!clock_gettime (CLOCK_REALTIME, &ts))
1593 have_realtime = 1;
1594 }
1595#endif
1596
1597#if EV_USE_MONOTONIC
1598 if (!have_monotonic)
1599 {
1600 struct timespec ts;
1601
1602 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1603 have_monotonic = 1;
1604 }
1605#endif
1606
1607 /* pid check not overridable via env */
1608#ifndef _WIN32
1609 if (flags & EVFLAG_FORKCHECK)
1610 curpid = getpid ();
1611#endif
1612
1613 if (!(flags & EVFLAG_NOENV)
1614 && !enable_secure ()
1615 && getenv ("LIBEV_FLAGS"))
1616 flags = atoi (getenv ("LIBEV_FLAGS"));
1617
1618 ev_rt_now = ev_time ();
1619 mn_now = get_clock ();
1620 now_floor = mn_now;
1621 rtmn_diff = ev_rt_now - mn_now;
1622#if EV_MINIMAL < 2
1623 invoke_cb = ev_invoke_pending;
1624#endif
1625
1626 io_blocktime = 0.;
1627 timeout_blocktime = 0.;
1628 backend = 0;
1629 backend_fd = -1;
1630 sig_pending = 0;
1631#if EV_ASYNC_ENABLE
1632 async_pending = 0;
1633#endif
1634#if EV_USE_INOTIFY
1635 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1636#endif
1637#if EV_USE_SIGNALFD
1638 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1639#endif
1640
1641 if (!(flags & 0x0000ffffU))
1642 flags |= ev_recommended_backends ();
1643
1644#if EV_USE_PORT
1645 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1646#endif
1647#if EV_USE_KQUEUE
1648 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1649#endif
1650#if EV_USE_EPOLL
1651 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1652#endif
1653#if EV_USE_POLL
1654 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1655#endif
1656#if EV_USE_SELECT
1657 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1658#endif
1659
1660 ev_prepare_init (&pending_w, pendingcb);
1661
1662 ev_init (&pipe_w, pipecb);
1663 ev_set_priority (&pipe_w, EV_MAXPRI);
1664 }
1665}
1666
1667/* free up a loop structure */
1668static void noinline
1669loop_destroy (EV_P)
1670{
1671 int i;
1672
1673 if (ev_is_active (&pipe_w))
1674 {
1675 /*ev_ref (EV_A);*/
1676 /*ev_io_stop (EV_A_ &pipe_w);*/
1677
1678#if EV_USE_EVENTFD
1679 if (evfd >= 0)
1680 close (evfd);
1681#endif
1682
1683 if (evpipe [0] >= 0)
1684 {
1685 EV_WIN32_CLOSE_FD (evpipe [0]);
1686 EV_WIN32_CLOSE_FD (evpipe [1]);
1687 }
1688 }
1689
1690#if EV_USE_SIGNALFD
1691 if (ev_is_active (&sigfd_w))
1692 close (sigfd);
1693#endif
1694
1695#if EV_USE_INOTIFY
1696 if (fs_fd >= 0)
1697 close (fs_fd);
1698#endif
1699
1700 if (backend_fd >= 0)
1701 close (backend_fd);
1702
1703#if EV_USE_PORT
1704 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1705#endif
1706#if EV_USE_KQUEUE
1707 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1708#endif
1709#if EV_USE_EPOLL
1710 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1711#endif
1712#if EV_USE_POLL
1713 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1714#endif
1715#if EV_USE_SELECT
1716 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1717#endif
1718
1719 for (i = NUMPRI; i--; )
1720 {
1721 array_free (pending, [i]);
1722#if EV_IDLE_ENABLE
1723 array_free (idle, [i]);
1724#endif
1725 }
1726
1727 ev_free (anfds); anfds = 0; anfdmax = 0;
1728
1729 /* have to use the microsoft-never-gets-it-right macro */
1730 array_free (rfeed, EMPTY);
1731 array_free (fdchange, EMPTY);
1732 array_free (timer, EMPTY);
1733#if EV_PERIODIC_ENABLE
1734 array_free (periodic, EMPTY);
1735#endif
1736#if EV_FORK_ENABLE
1737 array_free (fork, EMPTY);
1738#endif
1739 array_free (prepare, EMPTY);
1740 array_free (check, EMPTY);
1741#if EV_ASYNC_ENABLE
1742 array_free (async, EMPTY);
1743#endif
1744
1745 backend = 0;
1746}
1747
1748#if EV_USE_INOTIFY
1749inline_size void infy_fork (EV_P);
1750#endif
1751
1752inline_size void
1753loop_fork (EV_P)
1754{
1755#if EV_USE_PORT
1756 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1757#endif
1758#if EV_USE_KQUEUE
1759 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1760#endif
1761#if EV_USE_EPOLL
1762 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1763#endif
1764#if EV_USE_INOTIFY
1765 infy_fork (EV_A);
1766#endif
1767
1768 if (ev_is_active (&pipe_w))
1769 {
1770 /* this "locks" the handlers against writing to the pipe */
1771 /* while we modify the fd vars */
1772 sig_pending = 1;
1773#if EV_ASYNC_ENABLE
1774 async_pending = 1;
1775#endif
1776
1777 ev_ref (EV_A);
1778 ev_io_stop (EV_A_ &pipe_w);
1779
1780#if EV_USE_EVENTFD
1781 if (evfd >= 0)
1782 close (evfd);
1783#endif
1784
1785 if (evpipe [0] >= 0)
1786 {
1787 EV_WIN32_CLOSE_FD (evpipe [0]);
1788 EV_WIN32_CLOSE_FD (evpipe [1]);
1789 }
1790
1791 evpipe_init (EV_A);
1792 /* now iterate over everything, in case we missed something */
1793 pipecb (EV_A_ &pipe_w, EV_READ);
1794 }
1795
1796 postfork = 0;
1797}
1798
1799#if EV_MULTIPLICITY
1800
1801struct ev_loop *
1802ev_loop_new (unsigned int flags)
1803{
1804 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1805
1806 memset (EV_A, 0, sizeof (struct ev_loop));
1807 loop_init (EV_A_ flags);
1808
1809 if (ev_backend (EV_A))
1810 return EV_A;
1811
1812 return 0;
1813}
1814
1815void
1816ev_loop_destroy (EV_P)
1817{
1818 loop_destroy (EV_A);
1819 ev_free (loop);
1820}
1821
1822void
1823ev_loop_fork (EV_P)
1824{
1825 postfork = 1; /* must be in line with ev_default_fork */
1826}
1827#endif /* multiplicity */
1828
1829#if EV_VERIFY
1830static void noinline
1831verify_watcher (EV_P_ W w)
1832{
1833 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1834
1835 if (w->pending)
1836 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1837}
1838
1839static void noinline
1840verify_heap (EV_P_ ANHE *heap, int N)
1841{
1842 int i;
1843
1844 for (i = HEAP0; i < N + HEAP0; ++i)
1845 {
1846 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1847 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1848 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1849
1850 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1851 }
1852}
1853
1854static void noinline
1855array_verify (EV_P_ W *ws, int cnt)
1856{
1857 while (cnt--)
1858 {
1859 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1860 verify_watcher (EV_A_ ws [cnt]);
1861 }
1862}
1863#endif
1864
1865#if EV_MINIMAL < 2
1866void
1867ev_loop_verify (EV_P)
1868{
1869#if EV_VERIFY
1870 int i;
1871 WL w;
1872
1873 assert (activecnt >= -1);
1874
1875 assert (fdchangemax >= fdchangecnt);
1876 for (i = 0; i < fdchangecnt; ++i)
1877 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1878
1879 assert (anfdmax >= 0);
1880 for (i = 0; i < anfdmax; ++i)
1881 for (w = anfds [i].head; w; w = w->next)
414 { 1882 {
415 struct ev_timer *w = timers [0]; 1883 verify_watcher (EV_A_ (W)w);
1884 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
1885 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1886 }
416 1887
1888 assert (timermax >= timercnt);
1889 verify_heap (EV_A_ timers, timercnt);
1890
1891#if EV_PERIODIC_ENABLE
1892 assert (periodicmax >= periodiccnt);
1893 verify_heap (EV_A_ periodics, periodiccnt);
1894#endif
1895
1896 for (i = NUMPRI; i--; )
1897 {
1898 assert (pendingmax [i] >= pendingcnt [i]);
1899#if EV_IDLE_ENABLE
1900 assert (idleall >= 0);
1901 assert (idlemax [i] >= idlecnt [i]);
1902 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1903#endif
1904 }
1905
1906#if EV_FORK_ENABLE
1907 assert (forkmax >= forkcnt);
1908 array_verify (EV_A_ (W *)forks, forkcnt);
1909#endif
1910
1911#if EV_ASYNC_ENABLE
1912 assert (asyncmax >= asynccnt);
1913 array_verify (EV_A_ (W *)asyncs, asynccnt);
1914#endif
1915
1916 assert (preparemax >= preparecnt);
1917 array_verify (EV_A_ (W *)prepares, preparecnt);
1918
1919 assert (checkmax >= checkcnt);
1920 array_verify (EV_A_ (W *)checks, checkcnt);
1921
1922# if 0
1923 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1924 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
1925# endif
1926#endif
1927}
1928#endif
1929
1930#if EV_MULTIPLICITY
1931struct ev_loop *
1932ev_default_loop_init (unsigned int flags)
1933#else
1934int
1935ev_default_loop (unsigned int flags)
1936#endif
1937{
1938 if (!ev_default_loop_ptr)
1939 {
1940#if EV_MULTIPLICITY
1941 EV_P = ev_default_loop_ptr = &default_loop_struct;
1942#else
1943 ev_default_loop_ptr = 1;
1944#endif
1945
1946 loop_init (EV_A_ flags);
1947
1948 if (ev_backend (EV_A))
1949 {
1950#ifndef _WIN32
1951 ev_signal_init (&childev, childcb, SIGCHLD);
1952 ev_set_priority (&childev, EV_MAXPRI);
1953 ev_signal_start (EV_A_ &childev);
1954 ev_unref (EV_A); /* child watcher should not keep loop alive */
1955#endif
1956 }
1957 else
1958 ev_default_loop_ptr = 0;
1959 }
1960
1961 return ev_default_loop_ptr;
1962}
1963
1964void
1965ev_default_destroy (void)
1966{
1967#if EV_MULTIPLICITY
1968 EV_P = ev_default_loop_ptr;
1969#endif
1970
1971 ev_default_loop_ptr = 0;
1972
1973#ifndef _WIN32
1974 ev_ref (EV_A); /* child watcher */
1975 ev_signal_stop (EV_A_ &childev);
1976#endif
1977
1978 loop_destroy (EV_A);
1979}
1980
1981void
1982ev_default_fork (void)
1983{
1984#if EV_MULTIPLICITY
1985 EV_P = ev_default_loop_ptr;
1986#endif
1987
1988 postfork = 1; /* must be in line with ev_loop_fork */
1989}
1990
1991/*****************************************************************************/
1992
1993void
1994ev_invoke (EV_P_ void *w, int revents)
1995{
1996 EV_CB_INVOKE ((W)w, revents);
1997}
1998
1999unsigned int
2000ev_pending_count (EV_P)
2001{
2002 int pri;
2003 unsigned int count = 0;
2004
2005 for (pri = NUMPRI; pri--; )
2006 count += pendingcnt [pri];
2007
2008 return count;
2009}
2010
2011void noinline
2012ev_invoke_pending (EV_P)
2013{
2014 int pri;
2015
2016 for (pri = NUMPRI; pri--; )
2017 while (pendingcnt [pri])
2018 {
2019 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2020
2021 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
2022 /* ^ this is no longer true, as pending_w could be here */
2023
2024 p->w->pending = 0;
2025 EV_CB_INVOKE (p->w, p->events);
2026 EV_FREQUENT_CHECK;
2027 }
2028}
2029
2030#if EV_IDLE_ENABLE
2031/* make idle watchers pending. this handles the "call-idle */
2032/* only when higher priorities are idle" logic */
2033inline_size void
2034idle_reify (EV_P)
2035{
2036 if (expect_false (idleall))
2037 {
2038 int pri;
2039
2040 for (pri = NUMPRI; pri--; )
2041 {
2042 if (pendingcnt [pri])
2043 break;
2044
2045 if (idlecnt [pri])
2046 {
2047 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2048 break;
2049 }
2050 }
2051 }
2052}
2053#endif
2054
2055/* make timers pending */
2056inline_size void
2057timers_reify (EV_P)
2058{
2059 EV_FREQUENT_CHECK;
2060
2061 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2062 {
2063 do
2064 {
2065 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2066
2067 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2068
417 /* first reschedule or stop timer */ 2069 /* first reschedule or stop timer */
2070 if (w->repeat)
2071 {
2072 ev_at (w) += w->repeat;
2073 if (ev_at (w) < mn_now)
2074 ev_at (w) = mn_now;
2075
2076 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2077
2078 ANHE_at_cache (timers [HEAP0]);
2079 downheap (timers, timercnt, HEAP0);
2080 }
2081 else
2082 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2083
2084 EV_FREQUENT_CHECK;
2085 feed_reverse (EV_A_ (W)w);
2086 }
2087 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2088
2089 feed_reverse_done (EV_A_ EV_TIMEOUT);
2090 }
2091}
2092
2093#if EV_PERIODIC_ENABLE
2094/* make periodics pending */
2095inline_size void
2096periodics_reify (EV_P)
2097{
2098 EV_FREQUENT_CHECK;
2099
2100 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2101 {
2102 int feed_count = 0;
2103
2104 do
2105 {
2106 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2107
2108 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2109
2110 /* first reschedule or stop timer */
2111 if (w->reschedule_cb)
2112 {
2113 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2114
2115 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2116
2117 ANHE_at_cache (periodics [HEAP0]);
2118 downheap (periodics, periodiccnt, HEAP0);
2119 }
2120 else if (w->interval)
2121 {
2122 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2123 /* if next trigger time is not sufficiently in the future, put it there */
2124 /* this might happen because of floating point inexactness */
2125 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2126 {
2127 ev_at (w) += w->interval;
2128
2129 /* if interval is unreasonably low we might still have a time in the past */
2130 /* so correct this. this will make the periodic very inexact, but the user */
2131 /* has effectively asked to get triggered more often than possible */
2132 if (ev_at (w) < ev_rt_now)
2133 ev_at (w) = ev_rt_now;
2134 }
2135
2136 ANHE_at_cache (periodics [HEAP0]);
2137 downheap (periodics, periodiccnt, HEAP0);
2138 }
2139 else
2140 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2141
2142 EV_FREQUENT_CHECK;
2143 feed_reverse (EV_A_ (W)w);
2144 }
2145 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2146
2147 feed_reverse_done (EV_A_ EV_PERIODIC);
2148 }
2149}
2150
2151/* simply recalculate all periodics */
2152/* TODO: maybe ensure that at leats one event happens when jumping forward? */
2153static void noinline
2154periodics_reschedule (EV_P)
2155{
2156 int i;
2157
2158 /* adjust periodics after time jump */
2159 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2160 {
2161 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2162
2163 if (w->reschedule_cb)
2164 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2165 else if (w->interval)
2166 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2167
2168 ANHE_at_cache (periodics [i]);
2169 }
2170
2171 reheap (periodics, periodiccnt);
2172}
2173#endif
2174
2175/* adjust all timers by a given offset */
2176static void noinline
2177timers_reschedule (EV_P_ ev_tstamp adjust)
2178{
2179 int i;
2180
2181 for (i = 0; i < timercnt; ++i)
2182 {
2183 ANHE *he = timers + i + HEAP0;
2184 ANHE_w (*he)->at += adjust;
2185 ANHE_at_cache (*he);
2186 }
2187}
2188
2189/* fetch new monotonic and realtime times from the kernel */
2190/* also detect if there was a timejump, and act accordingly */
2191inline_speed void
2192time_update (EV_P_ ev_tstamp max_block)
2193{
2194#if EV_USE_MONOTONIC
2195 if (expect_true (have_monotonic))
2196 {
2197 int i;
2198 ev_tstamp odiff = rtmn_diff;
2199
2200 mn_now = get_clock ();
2201
2202 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2203 /* interpolate in the meantime */
2204 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2205 {
2206 ev_rt_now = rtmn_diff + mn_now;
2207 return;
2208 }
2209
2210 now_floor = mn_now;
2211 ev_rt_now = ev_time ();
2212
2213 /* loop a few times, before making important decisions.
2214 * on the choice of "4": one iteration isn't enough,
2215 * in case we get preempted during the calls to
2216 * ev_time and get_clock. a second call is almost guaranteed
2217 * to succeed in that case, though. and looping a few more times
2218 * doesn't hurt either as we only do this on time-jumps or
2219 * in the unlikely event of having been preempted here.
2220 */
2221 for (i = 4; --i; )
2222 {
2223 rtmn_diff = ev_rt_now - mn_now;
2224
2225 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2226 return; /* all is well */
2227
2228 ev_rt_now = ev_time ();
2229 mn_now = get_clock ();
2230 now_floor = mn_now;
2231 }
2232
2233 /* no timer adjustment, as the monotonic clock doesn't jump */
2234 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2235# if EV_PERIODIC_ENABLE
2236 periodics_reschedule (EV_A);
2237# endif
2238 }
2239 else
2240#endif
2241 {
2242 ev_rt_now = ev_time ();
2243
2244 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2245 {
2246 /* adjust timers. this is easy, as the offset is the same for all of them */
2247 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2248#if EV_PERIODIC_ENABLE
2249 periodics_reschedule (EV_A);
2250#endif
2251 }
2252
2253 mn_now = ev_rt_now;
2254 }
2255}
2256
2257void
2258ev_loop (EV_P_ int flags)
2259{
2260#if EV_MINIMAL < 2
2261 ++loop_depth;
2262#endif
2263
2264 assert (("libev: ev_loop recursion during release detected", loop_done != EVUNLOOP_RECURSE));
2265
2266 loop_done = EVUNLOOP_CANCEL;
2267
2268 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2269
2270 do
2271 {
2272#if EV_VERIFY >= 2
2273 ev_loop_verify (EV_A);
2274#endif
2275
2276#ifndef _WIN32
2277 if (expect_false (curpid)) /* penalise the forking check even more */
2278 if (expect_false (getpid () != curpid))
2279 {
2280 curpid = getpid ();
2281 postfork = 1;
2282 }
2283#endif
2284
2285#if EV_FORK_ENABLE
2286 /* we might have forked, so queue fork handlers */
2287 if (expect_false (postfork))
2288 if (forkcnt)
2289 {
2290 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2291 EV_INVOKE_PENDING;
2292 }
2293#endif
2294
2295 /* queue prepare watchers (and execute them) */
2296 if (expect_false (preparecnt))
2297 {
2298 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2299 EV_INVOKE_PENDING;
2300 }
2301
2302 if (expect_false (loop_done))
2303 break;
2304
2305 /* we might have forked, so reify kernel state if necessary */
2306 if (expect_false (postfork))
2307 loop_fork (EV_A);
2308
2309 /* update fd-related kernel structures */
2310 fd_reify (EV_A);
2311
2312 /* calculate blocking time */
2313 {
2314 ev_tstamp waittime = 0.;
2315 ev_tstamp sleeptime = 0.;
2316
2317 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
2318 {
2319 /* remember old timestamp for io_blocktime calculation */
2320 ev_tstamp prev_mn_now = mn_now;
2321
2322 /* update time to cancel out callback processing overhead */
2323 time_update (EV_A_ 1e100);
2324
2325 waittime = MAX_BLOCKTIME;
2326
2327 if (timercnt)
2328 {
2329 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2330 if (waittime > to) waittime = to;
2331 }
2332
2333#if EV_PERIODIC_ENABLE
2334 if (periodiccnt)
2335 {
2336 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2337 if (waittime > to) waittime = to;
2338 }
2339#endif
2340
2341 /* don't let timeouts decrease the waittime below timeout_blocktime */
2342 if (expect_false (waittime < timeout_blocktime))
2343 waittime = timeout_blocktime;
2344
2345 /* extra check because io_blocktime is commonly 0 */
2346 if (expect_false (io_blocktime))
2347 {
2348 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2349
2350 if (sleeptime > waittime - backend_fudge)
2351 sleeptime = waittime - backend_fudge;
2352
2353 if (expect_true (sleeptime > 0.))
2354 {
2355 ev_sleep (sleeptime);
2356 waittime -= sleeptime;
2357 }
2358 }
2359 }
2360
2361#if EV_MINIMAL < 2
2362 ++loop_count;
2363#endif
2364 assert ((loop_done = EVUNLOOP_RECURSE, 1)); /* assert for side effect */
2365 backend_poll (EV_A_ waittime);
2366 assert ((loop_done = EVUNLOOP_CANCEL, 1)); /* assert for side effect */
2367
2368 /* update ev_rt_now, do magic */
2369 time_update (EV_A_ waittime + sleeptime);
2370 }
2371
2372 /* queue pending timers and reschedule them */
2373 timers_reify (EV_A); /* relative timers called last */
2374#if EV_PERIODIC_ENABLE
2375 periodics_reify (EV_A); /* absolute timers called first */
2376#endif
2377
2378#if EV_IDLE_ENABLE
2379 /* queue idle watchers unless other events are pending */
2380 idle_reify (EV_A);
2381#endif
2382
2383 /* queue check watchers, to be executed first */
2384 if (expect_false (checkcnt))
2385 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2386
2387 EV_INVOKE_PENDING;
2388 }
2389 while (expect_true (
2390 activecnt
2391 && !loop_done
2392 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2393 ));
2394
2395 if (loop_done == EVUNLOOP_ONE)
2396 loop_done = EVUNLOOP_CANCEL;
2397
2398#if EV_MINIMAL < 2
2399 --loop_depth;
2400#endif
2401}
2402
2403void
2404ev_unloop (EV_P_ int how)
2405{
2406 loop_done = how;
2407}
2408
2409void
2410ev_ref (EV_P)
2411{
2412 ++activecnt;
2413}
2414
2415void
2416ev_unref (EV_P)
2417{
2418 --activecnt;
2419}
2420
2421void
2422ev_now_update (EV_P)
2423{
2424 time_update (EV_A_ 1e100);
2425}
2426
2427void
2428ev_suspend (EV_P)
2429{
2430 ev_now_update (EV_A);
2431}
2432
2433void
2434ev_resume (EV_P)
2435{
2436 ev_tstamp mn_prev = mn_now;
2437
2438 ev_now_update (EV_A);
2439 timers_reschedule (EV_A_ mn_now - mn_prev);
2440#if EV_PERIODIC_ENABLE
2441 /* TODO: really do this? */
2442 periodics_reschedule (EV_A);
2443#endif
2444}
2445
2446/*****************************************************************************/
2447/* singly-linked list management, used when the expected list length is short */
2448
2449inline_size void
2450wlist_add (WL *head, WL elem)
2451{
2452 elem->next = *head;
2453 *head = elem;
2454}
2455
2456inline_size void
2457wlist_del (WL *head, WL elem)
2458{
2459 while (*head)
2460 {
2461 if (expect_true (*head == elem))
2462 {
2463 *head = elem->next;
2464 break;
2465 }
2466
2467 head = &(*head)->next;
2468 }
2469}
2470
2471/* internal, faster, version of ev_clear_pending */
2472inline_speed void
2473clear_pending (EV_P_ W w)
2474{
2475 if (w->pending)
2476 {
2477 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2478 w->pending = 0;
2479 }
2480}
2481
2482int
2483ev_clear_pending (EV_P_ void *w)
2484{
2485 W w_ = (W)w;
2486 int pending = w_->pending;
2487
2488 if (expect_true (pending))
2489 {
2490 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2491 p->w = (W)&pending_w;
2492 w_->pending = 0;
2493 return p->events;
2494 }
2495 else
2496 return 0;
2497}
2498
2499inline_size void
2500pri_adjust (EV_P_ W w)
2501{
2502 int pri = ev_priority (w);
2503 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2504 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2505 ev_set_priority (w, pri);
2506}
2507
2508inline_speed void
2509ev_start (EV_P_ W w, int active)
2510{
2511 pri_adjust (EV_A_ w);
2512 w->active = active;
2513 ev_ref (EV_A);
2514}
2515
2516inline_size void
2517ev_stop (EV_P_ W w)
2518{
2519 ev_unref (EV_A);
2520 w->active = 0;
2521}
2522
2523/*****************************************************************************/
2524
2525void noinline
2526ev_io_start (EV_P_ ev_io *w)
2527{
2528 int fd = w->fd;
2529
2530 if (expect_false (ev_is_active (w)))
2531 return;
2532
2533 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2534 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2535
2536 EV_FREQUENT_CHECK;
2537
2538 ev_start (EV_A_ (W)w, 1);
2539 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2540 wlist_add (&anfds[fd].head, (WL)w);
2541
2542 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2543 w->events &= ~EV__IOFDSET;
2544
2545 EV_FREQUENT_CHECK;
2546}
2547
2548void noinline
2549ev_io_stop (EV_P_ ev_io *w)
2550{
2551 clear_pending (EV_A_ (W)w);
2552 if (expect_false (!ev_is_active (w)))
2553 return;
2554
2555 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2556
2557 EV_FREQUENT_CHECK;
2558
2559 wlist_del (&anfds[w->fd].head, (WL)w);
2560 ev_stop (EV_A_ (W)w);
2561
2562 fd_change (EV_A_ w->fd, 1);
2563
2564 EV_FREQUENT_CHECK;
2565}
2566
2567void noinline
2568ev_timer_start (EV_P_ ev_timer *w)
2569{
2570 if (expect_false (ev_is_active (w)))
2571 return;
2572
2573 ev_at (w) += mn_now;
2574
2575 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2576
2577 EV_FREQUENT_CHECK;
2578
2579 ++timercnt;
2580 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2581 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2582 ANHE_w (timers [ev_active (w)]) = (WT)w;
2583 ANHE_at_cache (timers [ev_active (w)]);
2584 upheap (timers, ev_active (w));
2585
2586 EV_FREQUENT_CHECK;
2587
2588 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2589}
2590
2591void noinline
2592ev_timer_stop (EV_P_ ev_timer *w)
2593{
2594 clear_pending (EV_A_ (W)w);
2595 if (expect_false (!ev_is_active (w)))
2596 return;
2597
2598 EV_FREQUENT_CHECK;
2599
2600 {
2601 int active = ev_active (w);
2602
2603 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2604
2605 --timercnt;
2606
2607 if (expect_true (active < timercnt + HEAP0))
2608 {
2609 timers [active] = timers [timercnt + HEAP0];
2610 adjustheap (timers, timercnt, active);
2611 }
2612 }
2613
2614 ev_at (w) -= mn_now;
2615
2616 ev_stop (EV_A_ (W)w);
2617
2618 EV_FREQUENT_CHECK;
2619}
2620
2621void noinline
2622ev_timer_again (EV_P_ ev_timer *w)
2623{
2624 EV_FREQUENT_CHECK;
2625
2626 if (ev_is_active (w))
2627 {
418 if (w->repeat) 2628 if (w->repeat)
419 { 2629 {
420 if (w->is_abs)
421 w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
422 else
423 w->at = now + w->repeat; 2630 ev_at (w) = mn_now + w->repeat;
424 2631 ANHE_at_cache (timers [ev_active (w)]);
425 assert (w->at > now);
426
427 downheap (timers, timercnt, 0); 2632 adjustheap (timers, timercnt, ev_active (w));
428 } 2633 }
429 else 2634 else
2635 ev_timer_stop (EV_A_ w);
2636 }
2637 else if (w->repeat)
2638 {
2639 ev_at (w) = w->repeat;
2640 ev_timer_start (EV_A_ w);
2641 }
2642
2643 EV_FREQUENT_CHECK;
2644}
2645
2646ev_tstamp
2647ev_timer_remaining (EV_P_ ev_timer *w)
2648{
2649 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2650}
2651
2652#if EV_PERIODIC_ENABLE
2653void noinline
2654ev_periodic_start (EV_P_ ev_periodic *w)
2655{
2656 if (expect_false (ev_is_active (w)))
2657 return;
2658
2659 if (w->reschedule_cb)
2660 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2661 else if (w->interval)
2662 {
2663 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2664 /* this formula differs from the one in periodic_reify because we do not always round up */
2665 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2666 }
2667 else
2668 ev_at (w) = w->offset;
2669
2670 EV_FREQUENT_CHECK;
2671
2672 ++periodiccnt;
2673 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2674 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2675 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2676 ANHE_at_cache (periodics [ev_active (w)]);
2677 upheap (periodics, ev_active (w));
2678
2679 EV_FREQUENT_CHECK;
2680
2681 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2682}
2683
2684void noinline
2685ev_periodic_stop (EV_P_ ev_periodic *w)
2686{
2687 clear_pending (EV_A_ (W)w);
2688 if (expect_false (!ev_is_active (w)))
2689 return;
2690
2691 EV_FREQUENT_CHECK;
2692
2693 {
2694 int active = ev_active (w);
2695
2696 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2697
2698 --periodiccnt;
2699
2700 if (expect_true (active < periodiccnt + HEAP0))
2701 {
2702 periodics [active] = periodics [periodiccnt + HEAP0];
2703 adjustheap (periodics, periodiccnt, active);
2704 }
2705 }
2706
2707 ev_stop (EV_A_ (W)w);
2708
2709 EV_FREQUENT_CHECK;
2710}
2711
2712void noinline
2713ev_periodic_again (EV_P_ ev_periodic *w)
2714{
2715 /* TODO: use adjustheap and recalculation */
2716 ev_periodic_stop (EV_A_ w);
2717 ev_periodic_start (EV_A_ w);
2718}
2719#endif
2720
2721#ifndef SA_RESTART
2722# define SA_RESTART 0
2723#endif
2724
2725void noinline
2726ev_signal_start (EV_P_ ev_signal *w)
2727{
2728 if (expect_false (ev_is_active (w)))
2729 return;
2730
2731 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2732
2733#if EV_MULTIPLICITY
2734 assert (("libev: a signal must not be attached to two different loops",
2735 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2736
2737 signals [w->signum - 1].loop = EV_A;
2738#endif
2739
2740 EV_FREQUENT_CHECK;
2741
2742#if EV_USE_SIGNALFD
2743 if (sigfd == -2)
2744 {
2745 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2746 if (sigfd < 0 && errno == EINVAL)
2747 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2748
2749 if (sigfd >= 0)
430 { 2750 {
431 evtimer_stop (w); /* nonrepeating: stop timer */ 2751 fd_intern (sigfd); /* doing it twice will not hurt */
432 --timercnt; /* maybe pass by reference instead? */ 2752
2753 sigemptyset (&sigfd_set);
2754
2755 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2756 ev_set_priority (&sigfd_w, EV_MAXPRI);
2757 ev_io_start (EV_A_ &sigfd_w);
2758 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
433 } 2759 }
2760 }
434 2761
435 event ((W)w, EV_TIMEOUT); 2762 if (sigfd >= 0)
2763 {
2764 /* TODO: check .head */
2765 sigaddset (&sigfd_set, w->signum);
2766 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2767
2768 signalfd (sigfd, &sigfd_set, 0);
2769 }
2770#endif
2771
2772 ev_start (EV_A_ (W)w, 1);
2773 wlist_add (&signals [w->signum - 1].head, (WL)w);
2774
2775 if (!((WL)w)->next)
2776# if EV_USE_SIGNALFD
2777 if (sigfd < 0) /*TODO*/
2778# endif
2779 {
2780# ifdef _WIN32
2781 evpipe_init (EV_A);
2782
2783 signal (w->signum, ev_sighandler);
2784# else
2785 struct sigaction sa;
2786
2787 evpipe_init (EV_A);
2788
2789 sa.sa_handler = ev_sighandler;
2790 sigfillset (&sa.sa_mask);
2791 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2792 sigaction (w->signum, &sa, 0);
2793
2794 sigemptyset (&sa.sa_mask);
2795 sigaddset (&sa.sa_mask, w->signum);
2796 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2797#endif
2798 }
2799
2800 EV_FREQUENT_CHECK;
2801}
2802
2803void noinline
2804ev_signal_stop (EV_P_ ev_signal *w)
2805{
2806 clear_pending (EV_A_ (W)w);
2807 if (expect_false (!ev_is_active (w)))
2808 return;
2809
2810 EV_FREQUENT_CHECK;
2811
2812 wlist_del (&signals [w->signum - 1].head, (WL)w);
2813 ev_stop (EV_A_ (W)w);
2814
2815 if (!signals [w->signum - 1].head)
2816 {
2817#if EV_MULTIPLICITY
2818 signals [w->signum - 1].loop = 0; /* unattach from signal */
2819#endif
2820#if EV_USE_SIGNALFD
2821 if (sigfd >= 0)
2822 {
2823 sigset_t ss;
2824
2825 sigemptyset (&ss);
2826 sigaddset (&ss, w->signum);
2827 sigdelset (&sigfd_set, w->signum);
2828
2829 signalfd (sigfd, &sigfd_set, 0);
2830 sigprocmask (SIG_UNBLOCK, &ss, 0);
2831 }
2832 else
2833#endif
2834 signal (w->signum, SIG_DFL);
2835 }
2836
2837 EV_FREQUENT_CHECK;
2838}
2839
2840void
2841ev_child_start (EV_P_ ev_child *w)
2842{
2843#if EV_MULTIPLICITY
2844 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2845#endif
2846 if (expect_false (ev_is_active (w)))
2847 return;
2848
2849 EV_FREQUENT_CHECK;
2850
2851 ev_start (EV_A_ (W)w, 1);
2852 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2853
2854 EV_FREQUENT_CHECK;
2855}
2856
2857void
2858ev_child_stop (EV_P_ ev_child *w)
2859{
2860 clear_pending (EV_A_ (W)w);
2861 if (expect_false (!ev_is_active (w)))
2862 return;
2863
2864 EV_FREQUENT_CHECK;
2865
2866 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2867 ev_stop (EV_A_ (W)w);
2868
2869 EV_FREQUENT_CHECK;
2870}
2871
2872#if EV_STAT_ENABLE
2873
2874# ifdef _WIN32
2875# undef lstat
2876# define lstat(a,b) _stati64 (a,b)
2877# endif
2878
2879#define DEF_STAT_INTERVAL 5.0074891
2880#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2881#define MIN_STAT_INTERVAL 0.1074891
2882
2883static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2884
2885#if EV_USE_INOTIFY
2886
2887/* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
2888# define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
2889
2890static void noinline
2891infy_add (EV_P_ ev_stat *w)
2892{
2893 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
2894
2895 if (w->wd >= 0)
2896 {
2897 struct statfs sfs;
2898
2899 /* now local changes will be tracked by inotify, but remote changes won't */
2900 /* unless the filesystem is known to be local, we therefore still poll */
2901 /* also do poll on <2.6.25, but with normal frequency */
2902
2903 if (!fs_2625)
2904 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2905 else if (!statfs (w->path, &sfs)
2906 && (sfs.f_type == 0x1373 /* devfs */
2907 || sfs.f_type == 0xEF53 /* ext2/3 */
2908 || sfs.f_type == 0x3153464a /* jfs */
2909 || sfs.f_type == 0x52654973 /* reiser3 */
2910 || sfs.f_type == 0x01021994 /* tempfs */
2911 || sfs.f_type == 0x58465342 /* xfs */))
2912 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
2913 else
2914 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
2915 }
2916 else
2917 {
2918 /* can't use inotify, continue to stat */
2919 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2920
2921 /* if path is not there, monitor some parent directory for speedup hints */
2922 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2923 /* but an efficiency issue only */
2924 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2925 {
2926 char path [4096];
2927 strcpy (path, w->path);
2928
2929 do
2930 {
2931 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2932 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2933
2934 char *pend = strrchr (path, '/');
2935
2936 if (!pend || pend == path)
2937 break;
2938
2939 *pend = 0;
2940 w->wd = inotify_add_watch (fs_fd, path, mask);
2941 }
2942 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2943 }
2944 }
2945
2946 if (w->wd >= 0)
2947 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2948
2949 /* now re-arm timer, if required */
2950 if (ev_is_active (&w->timer)) ev_ref (EV_A);
2951 ev_timer_again (EV_A_ &w->timer);
2952 if (ev_is_active (&w->timer)) ev_unref (EV_A);
2953}
2954
2955static void noinline
2956infy_del (EV_P_ ev_stat *w)
2957{
2958 int slot;
2959 int wd = w->wd;
2960
2961 if (wd < 0)
2962 return;
2963
2964 w->wd = -2;
2965 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2966 wlist_del (&fs_hash [slot].head, (WL)w);
2967
2968 /* remove this watcher, if others are watching it, they will rearm */
2969 inotify_rm_watch (fs_fd, wd);
2970}
2971
2972static void noinline
2973infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2974{
2975 if (slot < 0)
2976 /* overflow, need to check for all hash slots */
2977 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2978 infy_wd (EV_A_ slot, wd, ev);
2979 else
2980 {
2981 WL w_;
2982
2983 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2984 {
2985 ev_stat *w = (ev_stat *)w_;
2986 w_ = w_->next; /* lets us remove this watcher and all before it */
2987
2988 if (w->wd == wd || wd == -1)
2989 {
2990 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2991 {
2992 wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2993 w->wd = -1;
2994 infy_add (EV_A_ w); /* re-add, no matter what */
2995 }
2996
2997 stat_timer_cb (EV_A_ &w->timer, 0);
2998 }
2999 }
436 } 3000 }
437} 3001}
438 3002
439static void 3003static void
440time_update () 3004infy_cb (EV_P_ ev_io *w, int revents)
441{ 3005{
3006 char buf [EV_INOTIFY_BUFSIZE];
3007 int ofs;
3008 int len = read (fs_fd, buf, sizeof (buf));
3009
3010 for (ofs = 0; ofs < len; )
3011 {
3012 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3013 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3014 ofs += sizeof (struct inotify_event) + ev->len;
3015 }
3016}
3017
3018inline_size unsigned int
3019ev_linux_version (void)
3020{
3021 struct utsname buf;
3022 unsigned int v;
442 int i; 3023 int i;
443 ev_now = ev_time (); 3024 char *p = buf.release;
444 3025
445 if (have_monotonic) 3026 if (uname (&buf))
446 { 3027 return 0;
447 ev_tstamp odiff = diff;
448 3028
449 /* detecting time jumps is much more difficult */ 3029 for (i = 3+1; --i; )
450 for (i = 2; --i; ) /* loop a few times, before making important decisions */ 3030 {
3031 unsigned int c = 0;
3032
3033 for (;;)
451 { 3034 {
452 now = get_clock (); 3035 if (*p >= '0' && *p <= '9')
453 diff = ev_now - now; 3036 c = c * 10 + *p++ - '0';
454 3037 else
455 if (fabs (odiff - diff) < MIN_TIMEJUMP) 3038 {
456 return; /* all is well */ 3039 p += *p == '.';
457 3040 break;
458 ev_now = ev_time (); 3041 }
459 } 3042 }
460 3043
461 /* time jump detected, reschedule atimers */ 3044 v = (v << 8) | c;
462 for (i = 0; i < atimercnt; ++i) 3045 }
3046
3047 return v;
3048}
3049
3050inline_size void
3051ev_check_2625 (EV_P)
3052{
3053 /* kernels < 2.6.25 are borked
3054 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3055 */
3056 if (ev_linux_version () < 0x020619)
3057 return;
3058
3059 fs_2625 = 1;
3060}
3061
3062inline_size int
3063infy_newfd (void)
3064{
3065#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3066 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3067 if (fd >= 0)
3068 return fd;
3069#endif
3070 return inotify_init ();
3071}
3072
3073inline_size void
3074infy_init (EV_P)
3075{
3076 if (fs_fd != -2)
3077 return;
3078
3079 fs_fd = -1;
3080
3081 ev_check_2625 (EV_A);
3082
3083 fs_fd = infy_newfd ();
3084
3085 if (fs_fd >= 0)
3086 {
3087 fd_intern (fs_fd);
3088 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3089 ev_set_priority (&fs_w, EV_MAXPRI);
3090 ev_io_start (EV_A_ &fs_w);
3091 ev_unref (EV_A);
3092 }
3093}
3094
3095inline_size void
3096infy_fork (EV_P)
3097{
3098 int slot;
3099
3100 if (fs_fd < 0)
3101 return;
3102
3103 ev_ref (EV_A);
3104 ev_io_stop (EV_A_ &fs_w);
3105 close (fs_fd);
3106 fs_fd = infy_newfd ();
3107
3108 if (fs_fd >= 0)
3109 {
3110 fd_intern (fs_fd);
3111 ev_io_set (&fs_w, fs_fd, EV_READ);
3112 ev_io_start (EV_A_ &fs_w);
3113 ev_unref (EV_A);
3114 }
3115
3116 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
3117 {
3118 WL w_ = fs_hash [slot].head;
3119 fs_hash [slot].head = 0;
3120
3121 while (w_)
463 { 3122 {
464 struct ev_timer *w = atimers [i]; 3123 ev_stat *w = (ev_stat *)w_;
465 w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat; 3124 w_ = w_->next; /* lets us add this watcher */
3125
3126 w->wd = -1;
3127
3128 if (fs_fd >= 0)
3129 infy_add (EV_A_ w); /* re-add, no matter what */
3130 else
3131 {
3132 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3133 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3134 ev_timer_again (EV_A_ &w->timer);
3135 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3136 }
466 } 3137 }
467 } 3138 }
3139}
3140
3141#endif
3142
3143#ifdef _WIN32
3144# define EV_LSTAT(p,b) _stati64 (p, b)
3145#else
3146# define EV_LSTAT(p,b) lstat (p, b)
3147#endif
3148
3149void
3150ev_stat_stat (EV_P_ ev_stat *w)
3151{
3152 if (lstat (w->path, &w->attr) < 0)
3153 w->attr.st_nlink = 0;
3154 else if (!w->attr.st_nlink)
3155 w->attr.st_nlink = 1;
3156}
3157
3158static void noinline
3159stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3160{
3161 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3162
3163 ev_statdata prev = w->attr;
3164 ev_stat_stat (EV_A_ w);
3165
3166 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3167 if (
3168 prev.st_dev != w->attr.st_dev
3169 || prev.st_ino != w->attr.st_ino
3170 || prev.st_mode != w->attr.st_mode
3171 || prev.st_nlink != w->attr.st_nlink
3172 || prev.st_uid != w->attr.st_uid
3173 || prev.st_gid != w->attr.st_gid
3174 || prev.st_rdev != w->attr.st_rdev
3175 || prev.st_size != w->attr.st_size
3176 || prev.st_atime != w->attr.st_atime
3177 || prev.st_mtime != w->attr.st_mtime
3178 || prev.st_ctime != w->attr.st_ctime
3179 ) {
3180 /* we only update w->prev on actual differences */
3181 /* in case we test more often than invoke the callback, */
3182 /* to ensure that prev is always different to attr */
3183 w->prev = prev;
3184
3185 #if EV_USE_INOTIFY
3186 if (fs_fd >= 0)
3187 {
3188 infy_del (EV_A_ w);
3189 infy_add (EV_A_ w);
3190 ev_stat_stat (EV_A_ w); /* avoid race... */
3191 }
3192 #endif
3193
3194 ev_feed_event (EV_A_ w, EV_STAT);
3195 }
3196}
3197
3198void
3199ev_stat_start (EV_P_ ev_stat *w)
3200{
3201 if (expect_false (ev_is_active (w)))
3202 return;
3203
3204 ev_stat_stat (EV_A_ w);
3205
3206 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3207 w->interval = MIN_STAT_INTERVAL;
3208
3209 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3210 ev_set_priority (&w->timer, ev_priority (w));
3211
3212#if EV_USE_INOTIFY
3213 infy_init (EV_A);
3214
3215 if (fs_fd >= 0)
3216 infy_add (EV_A_ w);
468 else 3217 else
3218#endif
3219 {
3220 ev_timer_again (EV_A_ &w->timer);
3221 ev_unref (EV_A);
3222 }
3223
3224 ev_start (EV_A_ (W)w, 1);
3225
3226 EV_FREQUENT_CHECK;
3227}
3228
3229void
3230ev_stat_stop (EV_P_ ev_stat *w)
3231{
3232 clear_pending (EV_A_ (W)w);
3233 if (expect_false (!ev_is_active (w)))
3234 return;
3235
3236 EV_FREQUENT_CHECK;
3237
3238#if EV_USE_INOTIFY
3239 infy_del (EV_A_ w);
3240#endif
3241
3242 if (ev_is_active (&w->timer))
3243 {
3244 ev_ref (EV_A);
3245 ev_timer_stop (EV_A_ &w->timer);
3246 }
3247
3248 ev_stop (EV_A_ (W)w);
3249
3250 EV_FREQUENT_CHECK;
3251}
3252#endif
3253
3254#if EV_IDLE_ENABLE
3255void
3256ev_idle_start (EV_P_ ev_idle *w)
3257{
3258 if (expect_false (ev_is_active (w)))
3259 return;
3260
3261 pri_adjust (EV_A_ (W)w);
3262
3263 EV_FREQUENT_CHECK;
3264
3265 {
3266 int active = ++idlecnt [ABSPRI (w)];
3267
3268 ++idleall;
3269 ev_start (EV_A_ (W)w, active);
3270
3271 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3272 idles [ABSPRI (w)][active - 1] = w;
3273 }
3274
3275 EV_FREQUENT_CHECK;
3276}
3277
3278void
3279ev_idle_stop (EV_P_ ev_idle *w)
3280{
3281 clear_pending (EV_A_ (W)w);
3282 if (expect_false (!ev_is_active (w)))
3283 return;
3284
3285 EV_FREQUENT_CHECK;
3286
3287 {
3288 int active = ev_active (w);
3289
3290 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3291 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3292
3293 ev_stop (EV_A_ (W)w);
3294 --idleall;
3295 }
3296
3297 EV_FREQUENT_CHECK;
3298}
3299#endif
3300
3301void
3302ev_prepare_start (EV_P_ ev_prepare *w)
3303{
3304 if (expect_false (ev_is_active (w)))
3305 return;
3306
3307 EV_FREQUENT_CHECK;
3308
3309 ev_start (EV_A_ (W)w, ++preparecnt);
3310 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3311 prepares [preparecnt - 1] = w;
3312
3313 EV_FREQUENT_CHECK;
3314}
3315
3316void
3317ev_prepare_stop (EV_P_ ev_prepare *w)
3318{
3319 clear_pending (EV_A_ (W)w);
3320 if (expect_false (!ev_is_active (w)))
3321 return;
3322
3323 EV_FREQUENT_CHECK;
3324
3325 {
3326 int active = ev_active (w);
3327
3328 prepares [active - 1] = prepares [--preparecnt];
3329 ev_active (prepares [active - 1]) = active;
3330 }
3331
3332 ev_stop (EV_A_ (W)w);
3333
3334 EV_FREQUENT_CHECK;
3335}
3336
3337void
3338ev_check_start (EV_P_ ev_check *w)
3339{
3340 if (expect_false (ev_is_active (w)))
3341 return;
3342
3343 EV_FREQUENT_CHECK;
3344
3345 ev_start (EV_A_ (W)w, ++checkcnt);
3346 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3347 checks [checkcnt - 1] = w;
3348
3349 EV_FREQUENT_CHECK;
3350}
3351
3352void
3353ev_check_stop (EV_P_ ev_check *w)
3354{
3355 clear_pending (EV_A_ (W)w);
3356 if (expect_false (!ev_is_active (w)))
3357 return;
3358
3359 EV_FREQUENT_CHECK;
3360
3361 {
3362 int active = ev_active (w);
3363
3364 checks [active - 1] = checks [--checkcnt];
3365 ev_active (checks [active - 1]) = active;
3366 }
3367
3368 ev_stop (EV_A_ (W)w);
3369
3370 EV_FREQUENT_CHECK;
3371}
3372
3373#if EV_EMBED_ENABLE
3374void noinline
3375ev_embed_sweep (EV_P_ ev_embed *w)
3376{
3377 ev_loop (w->other, EVLOOP_NONBLOCK);
3378}
3379
3380static void
3381embed_io_cb (EV_P_ ev_io *io, int revents)
3382{
3383 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3384
3385 if (ev_cb (w))
3386 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3387 else
3388 ev_loop (w->other, EVLOOP_NONBLOCK);
3389}
3390
3391static void
3392embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3393{
3394 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3395
3396 {
3397 EV_P = w->other;
3398
3399 while (fdchangecnt)
469 { 3400 {
470 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
471 /* time jump detected, adjust rtimers */
472 for (i = 0; i < rtimercnt; ++i)
473 rtimers [i]->at += ev_now - now;
474
475 now = ev_now;
476 }
477}
478
479int ev_loop_done;
480
481void ev_loop (int flags)
482{
483 double block;
484 ev_loop_done = flags & EVLOOP_ONESHOT;
485
486 if (checkcnt)
487 {
488 queue_events ((W *)checks, checkcnt, EV_CHECK);
489 call_pending ();
490 }
491
492 do
493 {
494 /* update fd-related kernel structures */
495 fd_reify (); 3401 fd_reify (EV_A);
3402 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3403 }
3404 }
3405}
496 3406
497 /* calculate blocking time */ 3407static void
498 if (flags & EVLOOP_NONBLOCK || idlecnt) 3408embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
499 block = 0.; 3409{
3410 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3411
3412 ev_embed_stop (EV_A_ w);
3413
3414 {
3415 EV_P = w->other;
3416
3417 ev_loop_fork (EV_A);
3418 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3419 }
3420
3421 ev_embed_start (EV_A_ w);
3422}
3423
3424#if 0
3425static void
3426embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3427{
3428 ev_idle_stop (EV_A_ idle);
3429}
3430#endif
3431
3432void
3433ev_embed_start (EV_P_ ev_embed *w)
3434{
3435 if (expect_false (ev_is_active (w)))
3436 return;
3437
3438 {
3439 EV_P = w->other;
3440 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3441 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3442 }
3443
3444 EV_FREQUENT_CHECK;
3445
3446 ev_set_priority (&w->io, ev_priority (w));
3447 ev_io_start (EV_A_ &w->io);
3448
3449 ev_prepare_init (&w->prepare, embed_prepare_cb);
3450 ev_set_priority (&w->prepare, EV_MINPRI);
3451 ev_prepare_start (EV_A_ &w->prepare);
3452
3453 ev_fork_init (&w->fork, embed_fork_cb);
3454 ev_fork_start (EV_A_ &w->fork);
3455
3456 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3457
3458 ev_start (EV_A_ (W)w, 1);
3459
3460 EV_FREQUENT_CHECK;
3461}
3462
3463void
3464ev_embed_stop (EV_P_ ev_embed *w)
3465{
3466 clear_pending (EV_A_ (W)w);
3467 if (expect_false (!ev_is_active (w)))
3468 return;
3469
3470 EV_FREQUENT_CHECK;
3471
3472 ev_io_stop (EV_A_ &w->io);
3473 ev_prepare_stop (EV_A_ &w->prepare);
3474 ev_fork_stop (EV_A_ &w->fork);
3475
3476 ev_stop (EV_A_ (W)w);
3477
3478 EV_FREQUENT_CHECK;
3479}
3480#endif
3481
3482#if EV_FORK_ENABLE
3483void
3484ev_fork_start (EV_P_ ev_fork *w)
3485{
3486 if (expect_false (ev_is_active (w)))
3487 return;
3488
3489 EV_FREQUENT_CHECK;
3490
3491 ev_start (EV_A_ (W)w, ++forkcnt);
3492 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3493 forks [forkcnt - 1] = w;
3494
3495 EV_FREQUENT_CHECK;
3496}
3497
3498void
3499ev_fork_stop (EV_P_ ev_fork *w)
3500{
3501 clear_pending (EV_A_ (W)w);
3502 if (expect_false (!ev_is_active (w)))
3503 return;
3504
3505 EV_FREQUENT_CHECK;
3506
3507 {
3508 int active = ev_active (w);
3509
3510 forks [active - 1] = forks [--forkcnt];
3511 ev_active (forks [active - 1]) = active;
3512 }
3513
3514 ev_stop (EV_A_ (W)w);
3515
3516 EV_FREQUENT_CHECK;
3517}
3518#endif
3519
3520#if EV_ASYNC_ENABLE
3521void
3522ev_async_start (EV_P_ ev_async *w)
3523{
3524 if (expect_false (ev_is_active (w)))
3525 return;
3526
3527 evpipe_init (EV_A);
3528
3529 EV_FREQUENT_CHECK;
3530
3531 ev_start (EV_A_ (W)w, ++asynccnt);
3532 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3533 asyncs [asynccnt - 1] = w;
3534
3535 EV_FREQUENT_CHECK;
3536}
3537
3538void
3539ev_async_stop (EV_P_ ev_async *w)
3540{
3541 clear_pending (EV_A_ (W)w);
3542 if (expect_false (!ev_is_active (w)))
3543 return;
3544
3545 EV_FREQUENT_CHECK;
3546
3547 {
3548 int active = ev_active (w);
3549
3550 asyncs [active - 1] = asyncs [--asynccnt];
3551 ev_active (asyncs [active - 1]) = active;
3552 }
3553
3554 ev_stop (EV_A_ (W)w);
3555
3556 EV_FREQUENT_CHECK;
3557}
3558
3559void
3560ev_async_send (EV_P_ ev_async *w)
3561{
3562 w->sent = 1;
3563 evpipe_write (EV_A_ &async_pending);
3564}
3565#endif
3566
3567/*****************************************************************************/
3568
3569struct ev_once
3570{
3571 ev_io io;
3572 ev_timer to;
3573 void (*cb)(int revents, void *arg);
3574 void *arg;
3575};
3576
3577static void
3578once_cb (EV_P_ struct ev_once *once, int revents)
3579{
3580 void (*cb)(int revents, void *arg) = once->cb;
3581 void *arg = once->arg;
3582
3583 ev_io_stop (EV_A_ &once->io);
3584 ev_timer_stop (EV_A_ &once->to);
3585 ev_free (once);
3586
3587 cb (revents, arg);
3588}
3589
3590static void
3591once_cb_io (EV_P_ ev_io *w, int revents)
3592{
3593 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3594
3595 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3596}
3597
3598static void
3599once_cb_to (EV_P_ ev_timer *w, int revents)
3600{
3601 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3602
3603 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3604}
3605
3606void
3607ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3608{
3609 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3610
3611 if (expect_false (!once))
3612 {
3613 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3614 return;
3615 }
3616
3617 once->cb = cb;
3618 once->arg = arg;
3619
3620 ev_init (&once->io, once_cb_io);
3621 if (fd >= 0)
3622 {
3623 ev_io_set (&once->io, fd, events);
3624 ev_io_start (EV_A_ &once->io);
3625 }
3626
3627 ev_init (&once->to, once_cb_to);
3628 if (timeout >= 0.)
3629 {
3630 ev_timer_set (&once->to, timeout, 0.);
3631 ev_timer_start (EV_A_ &once->to);
3632 }
3633}
3634
3635/*****************************************************************************/
3636
3637#if EV_WALK_ENABLE
3638void
3639ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3640{
3641 int i, j;
3642 ev_watcher_list *wl, *wn;
3643
3644 if (types & (EV_IO | EV_EMBED))
3645 for (i = 0; i < anfdmax; ++i)
3646 for (wl = anfds [i].head; wl; )
3647 {
3648 wn = wl->next;
3649
3650#if EV_EMBED_ENABLE
3651 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3652 {
3653 if (types & EV_EMBED)
3654 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3655 }
3656 else
3657#endif
3658#if EV_USE_INOTIFY
3659 if (ev_cb ((ev_io *)wl) == infy_cb)
3660 ;
3661 else
3662#endif
3663 if ((ev_io *)wl != &pipe_w)
3664 if (types & EV_IO)
3665 cb (EV_A_ EV_IO, wl);
3666
3667 wl = wn;
3668 }
3669
3670 if (types & (EV_TIMER | EV_STAT))
3671 for (i = timercnt + HEAP0; i-- > HEAP0; )
3672#if EV_STAT_ENABLE
3673 /*TODO: timer is not always active*/
3674 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3675 {
3676 if (types & EV_STAT)
3677 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3678 }
500 else 3679 else
3680#endif
3681 if (types & EV_TIMER)
3682 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3683
3684#if EV_PERIODIC_ENABLE
3685 if (types & EV_PERIODIC)
3686 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3687 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3688#endif
3689
3690#if EV_IDLE_ENABLE
3691 if (types & EV_IDLE)
3692 for (j = NUMPRI; i--; )
3693 for (i = idlecnt [j]; i--; )
3694 cb (EV_A_ EV_IDLE, idles [j][i]);
3695#endif
3696
3697#if EV_FORK_ENABLE
3698 if (types & EV_FORK)
3699 for (i = forkcnt; i--; )
3700 if (ev_cb (forks [i]) != embed_fork_cb)
3701 cb (EV_A_ EV_FORK, forks [i]);
3702#endif
3703
3704#if EV_ASYNC_ENABLE
3705 if (types & EV_ASYNC)
3706 for (i = asynccnt; i--; )
3707 cb (EV_A_ EV_ASYNC, asyncs [i]);
3708#endif
3709
3710 if (types & EV_PREPARE)
3711 for (i = preparecnt; i--; )
3712#if EV_EMBED_ENABLE
3713 if (ev_cb (prepares [i]) != embed_prepare_cb)
3714#endif
3715 cb (EV_A_ EV_PREPARE, prepares [i]);
3716
3717 if (types & EV_CHECK)
3718 for (i = checkcnt; i--; )
3719 cb (EV_A_ EV_CHECK, checks [i]);
3720
3721 if (types & EV_SIGNAL)
3722 for (i = 0; i < EV_NSIG - 1; ++i)
3723 for (wl = signals [i].head; wl; )
501 { 3724 {
502 block = MAX_BLOCKTIME; 3725 wn = wl->next;
503 3726 cb (EV_A_ EV_SIGNAL, wl);
504 if (rtimercnt) 3727 wl = wn;
505 {
506 ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;
507 if (block > to) block = to;
508 }
509
510 if (atimercnt)
511 {
512 ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;
513 if (block > to) block = to;
514 }
515
516 if (block < 0.) block = 0.;
517 } 3728 }
518 3729
519 method_poll (block); 3730 if (types & EV_CHILD)
520 3731 for (i = EV_PID_HASHSIZE; i--; )
521 /* update ev_now, do magic */ 3732 for (wl = childs [i]; wl; )
522 time_update ();
523
524 /* queue pending timers and reschedule them */
525 /* absolute timers first */
526 timers_reify (atimers, atimercnt, ev_now);
527 /* relative timers second */
528 timers_reify (rtimers, rtimercnt, now);
529
530 /* queue idle watchers unless io or timers are pending */
531 if (!pendingcnt)
532 queue_events ((W *)idles, idlecnt, EV_IDLE);
533
534 /* queue check and possibly idle watchers */
535 queue_events ((W *)checks, checkcnt, EV_CHECK);
536
537 call_pending ();
538 }
539 while (!ev_loop_done);
540}
541
542/*****************************************************************************/
543
544static void
545wlist_add (WL *head, WL elem)
546{
547 elem->next = *head;
548 *head = elem;
549}
550
551static void
552wlist_del (WL *head, WL elem)
553{
554 while (*head)
555 {
556 if (*head == elem)
557 { 3733 {
558 *head = elem->next; 3734 wn = wl->next;
559 return; 3735 cb (EV_A_ EV_CHILD, wl);
3736 wl = wn;
560 } 3737 }
561 3738/* EV_STAT 0x00001000 /* stat data changed */
562 head = &(*head)->next; 3739/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
563 }
564} 3740}
565
566static void
567ev_start (W w, int active)
568{
569 w->pending = 0;
570 w->active = active;
571}
572
573static void
574ev_stop (W w)
575{
576 if (w->pending)
577 pendings [w->pending - 1].w = 0;
578
579 w->active = 0;
580}
581
582/*****************************************************************************/
583
584void
585evio_start (struct ev_io *w)
586{
587 if (ev_is_active (w))
588 return;
589
590 int fd = w->fd;
591
592 ev_start ((W)w, 1);
593 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
594 wlist_add ((WL *)&anfds[fd].head, (WL)w);
595
596 ++fdchangecnt;
597 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598 fdchanges [fdchangecnt - 1] = fd;
599}
600
601void
602evio_stop (struct ev_io *w)
603{
604 if (!ev_is_active (w))
605 return;
606
607 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
608 ev_stop ((W)w);
609
610 ++fdchangecnt;
611 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
612 fdchanges [fdchangecnt - 1] = w->fd;
613}
614
615void
616evtimer_start (struct ev_timer *w)
617{
618 if (ev_is_active (w))
619 return;
620
621 if (w->is_abs)
622 {
623 /* this formula differs from the one in timer_reify becuse we do not round up */
624 if (w->repeat)
625 w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
626
627 ev_start ((W)w, ++atimercnt);
628 array_needsize (atimers, atimermax, atimercnt, );
629 atimers [atimercnt - 1] = w;
630 upheap (atimers, atimercnt - 1);
631 }
632 else
633 {
634 w->at += now;
635
636 ev_start ((W)w, ++rtimercnt);
637 array_needsize (rtimers, rtimermax, rtimercnt, );
638 rtimers [rtimercnt - 1] = w;
639 upheap (rtimers, rtimercnt - 1);
640 }
641
642}
643
644void
645evtimer_stop (struct ev_timer *w)
646{
647 if (!ev_is_active (w))
648 return;
649
650 if (w->is_abs)
651 {
652 if (w->active < atimercnt--)
653 {
654 atimers [w->active - 1] = atimers [atimercnt];
655 downheap (atimers, atimercnt, w->active - 1);
656 }
657 }
658 else
659 {
660 if (w->active < rtimercnt--)
661 {
662 rtimers [w->active - 1] = rtimers [rtimercnt];
663 downheap (rtimers, rtimercnt, w->active - 1);
664 }
665 }
666
667 ev_stop ((W)w);
668}
669
670void
671evsignal_start (struct ev_signal *w)
672{
673 if (ev_is_active (w))
674 return;
675
676 ev_start ((W)w, 1);
677 array_needsize (signals, signalmax, w->signum, signals_init);
678 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
679
680 if (!w->next)
681 {
682 struct sigaction sa;
683 sa.sa_handler = sighandler;
684 sigfillset (&sa.sa_mask);
685 sa.sa_flags = 0;
686 sigaction (w->signum, &sa, 0);
687 }
688}
689
690void
691evsignal_stop (struct ev_signal *w)
692{
693 if (!ev_is_active (w))
694 return;
695
696 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
697 ev_stop ((W)w);
698
699 if (!signals [w->signum - 1].head)
700 signal (w->signum, SIG_DFL);
701}
702
703void evidle_start (struct ev_idle *w)
704{
705 if (ev_is_active (w))
706 return;
707
708 ev_start ((W)w, ++idlecnt);
709 array_needsize (idles, idlemax, idlecnt, );
710 idles [idlecnt - 1] = w;
711}
712
713void evidle_stop (struct ev_idle *w)
714{
715 idles [w->active - 1] = idles [--idlecnt];
716 ev_stop ((W)w);
717}
718
719void evcheck_start (struct ev_check *w)
720{
721 if (ev_is_active (w))
722 return;
723
724 ev_start ((W)w, ++checkcnt);
725 array_needsize (checks, checkmax, checkcnt, );
726 checks [checkcnt - 1] = w;
727}
728
729void evcheck_stop (struct ev_check *w)
730{
731 checks [w->active - 1] = checks [--checkcnt];
732 ev_stop ((W)w);
733}
734
735/*****************************************************************************/
736
737#if 0
738
739static void
740sin_cb (struct ev_io *w, int revents)
741{
742 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
743}
744
745static void
746ocb (struct ev_timer *w, int revents)
747{
748 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
749 evtimer_stop (w);
750 evtimer_start (w);
751}
752
753static void
754scb (struct ev_signal *w, int revents)
755{
756 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
757}
758
759static void
760gcb (struct ev_signal *w, int revents)
761{
762 fprintf (stderr, "generic %x\n", revents);
763}
764
765int main (void)
766{
767 struct ev_io sin;
768
769 ev_init (0);
770
771 evw_init (&sin, sin_cb, 55);
772 evio_set (&sin, 0, EV_READ);
773 evio_start (&sin);
774
775 struct ev_timer t[10000];
776
777#if 0
778 int i;
779 for (i = 0; i < 10000; ++i)
780 {
781 struct ev_timer *w = t + i;
782 evw_init (w, ocb, i);
783 evtimer_set_abs (w, drand48 (), 0.99775533);
784 evtimer_start (w);
785 if (drand48 () < 0.5)
786 evtimer_stop (w);
787 }
788#endif 3741#endif
789 3742
790 struct ev_timer t1; 3743#if EV_MULTIPLICITY
791 evw_init (&t1, ocb, 0); 3744 #include "ev_wrap.h"
792 evtimer_set_abs (&t1, 5, 10);
793 evtimer_start (&t1);
794
795 struct ev_signal sig;
796 evw_init (&sig, scb, 65535);
797 evsignal_set (&sig, SIGQUIT);
798 evsignal_start (&sig);
799
800 struct ev_check cw;
801 evw_init (&cw, gcb, 0);
802 evcheck_start (&cw);
803
804 struct ev_idle iw;
805 evw_init (&iw, gcb, 0);
806 evidle_start (&iw);
807
808 ev_loop (0);
809
810 return 0;
811}
812
813#endif 3745#endif
814 3746
3747#ifdef __cplusplus
3748}
3749#endif
815 3750
816
817

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