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Comparing libev/ev.c (file contents):
Revision 1.16 by root, Wed Oct 31 13:57:34 2007 UTC vs.
Revision 1.321 by root, Thu Dec 31 06:50:17 2009 UTC

1/*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009 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 && HAVE_SYS_QUEUE_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>
6#include <stddef.h> 160#include <stddef.h>
7 161
8#include <stdio.h> 162#include <stdio.h>
9 163
10#include <assert.h> 164#include <assert.h>
11#include <errno.h> 165#include <errno.h>
12#include <sys/time.h> 166#include <sys/types.h>
13#include <time.h> 167#include <time.h>
14 168
15#define HAVE_EPOLL 1 169#include <signal.h>
16 170
171#ifdef EV_H
172# include EV_H
173#else
174# include "ev.h"
175#endif
176
177#ifndef _WIN32
178# include <sys/time.h>
179# include <sys/wait.h>
180# include <unistd.h>
181#else
182# include <io.h>
183# define WIN32_LEAN_AND_MEAN
184# include <windows.h>
185# ifndef EV_SELECT_IS_WINSOCKET
186# define EV_SELECT_IS_WINSOCKET 1
187# endif
188#endif
189
190/* this block tries to deduce configuration from header-defined symbols and defaults */
191
192/* try to deduce the maximum number of signals on this platform */
193#if defined (EV_NSIG)
194/* use what's provided */
195#elif defined (NSIG)
196# define EV_NSIG (NSIG)
197#elif defined(_NSIG)
198# define EV_NSIG (_NSIG)
199#elif defined (SIGMAX)
200# define EV_NSIG (SIGMAX+1)
201#elif defined (SIG_MAX)
202# define EV_NSIG (SIG_MAX+1)
203#elif defined (_SIG_MAX)
204# define EV_NSIG (_SIG_MAX+1)
205#elif defined (MAXSIG)
206# define EV_NSIG (MAXSIG+1)
207#elif defined (MAX_SIG)
208# define EV_NSIG (MAX_SIG+1)
209#elif defined (SIGARRAYSIZE)
210# define EV_NSIG SIGARRAYSIZE /* Assume ary[SIGARRAYSIZE] */
211#elif defined (_sys_nsig)
212# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
213#else
214# error "unable to find value for NSIG, please report"
215/* to make it compile regardless, just remove the above line */
216# define EV_NSIG 65
217#endif
218
219#ifndef EV_USE_CLOCK_SYSCALL
220# if __linux && __GLIBC__ >= 2
221# define EV_USE_CLOCK_SYSCALL 1
222# else
223# define EV_USE_CLOCK_SYSCALL 0
224# endif
225#endif
226
17#ifndef HAVE_MONOTONIC 227#ifndef EV_USE_MONOTONIC
228# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
229# define EV_USE_MONOTONIC 1
230# else
231# define EV_USE_MONOTONIC 0
232# endif
233#endif
234
235#ifndef EV_USE_REALTIME
236# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
237#endif
238
239#ifndef EV_USE_NANOSLEEP
240# if _POSIX_C_SOURCE >= 199309L
241# define EV_USE_NANOSLEEP 1
242# else
243# define EV_USE_NANOSLEEP 0
244# endif
245#endif
246
247#ifndef EV_USE_SELECT
248# define EV_USE_SELECT 1
249#endif
250
251#ifndef EV_USE_POLL
252# ifdef _WIN32
253# define EV_USE_POLL 0
254# else
255# define EV_USE_POLL 1
256# endif
257#endif
258
259#ifndef EV_USE_EPOLL
260# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
261# define EV_USE_EPOLL 1
262# else
263# define EV_USE_EPOLL 0
264# endif
265#endif
266
267#ifndef EV_USE_KQUEUE
268# define EV_USE_KQUEUE 0
269#endif
270
271#ifndef EV_USE_PORT
272# define EV_USE_PORT 0
273#endif
274
275#ifndef EV_USE_INOTIFY
276# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
277# define EV_USE_INOTIFY 1
278# else
279# define EV_USE_INOTIFY 0
280# endif
281#endif
282
283#ifndef EV_PID_HASHSIZE
284# if EV_MINIMAL
285# define EV_PID_HASHSIZE 1
286# else
287# define EV_PID_HASHSIZE 16
288# endif
289#endif
290
291#ifndef EV_INOTIFY_HASHSIZE
292# if EV_MINIMAL
293# define EV_INOTIFY_HASHSIZE 1
294# else
295# define EV_INOTIFY_HASHSIZE 16
296# endif
297#endif
298
299#ifndef EV_USE_EVENTFD
300# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
301# define EV_USE_EVENTFD 1
302# else
303# define EV_USE_EVENTFD 0
304# endif
305#endif
306
307#ifndef EV_USE_SIGNALFD
308# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
309# define EV_USE_SIGNALFD 1
310# else
311# define EV_USE_SIGNALFD 0
312# endif
313#endif
314
315#if 0 /* debugging */
316# define EV_VERIFY 3
317# define EV_USE_4HEAP 1
318# define EV_HEAP_CACHE_AT 1
319#endif
320
321#ifndef EV_VERIFY
322# define EV_VERIFY !EV_MINIMAL
323#endif
324
325#ifndef EV_USE_4HEAP
326# define EV_USE_4HEAP !EV_MINIMAL
327#endif
328
329#ifndef EV_HEAP_CACHE_AT
330# define EV_HEAP_CACHE_AT !EV_MINIMAL
331#endif
332
333/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
334/* which makes programs even slower. might work on other unices, too. */
335#if EV_USE_CLOCK_SYSCALL
336# include <syscall.h>
337# ifdef SYS_clock_gettime
338# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
339# undef EV_USE_MONOTONIC
340# define EV_USE_MONOTONIC 1
341# else
342# undef EV_USE_CLOCK_SYSCALL
343# define EV_USE_CLOCK_SYSCALL 0
344# endif
345#endif
346
347/* this block fixes any misconfiguration where we know we run into trouble otherwise */
348
18# ifdef CLOCK_MONOTONIC 349#ifndef CLOCK_MONOTONIC
350# undef EV_USE_MONOTONIC
19# define HAVE_MONOTONIC 1 351# define EV_USE_MONOTONIC 0
352#endif
353
354#ifndef CLOCK_REALTIME
355# undef EV_USE_REALTIME
356# define EV_USE_REALTIME 0
357#endif
358
359#if !EV_STAT_ENABLE
360# undef EV_USE_INOTIFY
361# define EV_USE_INOTIFY 0
362#endif
363
364#if !EV_USE_NANOSLEEP
365# ifndef _WIN32
366# include <sys/select.h>
367# endif
368#endif
369
370#if EV_USE_INOTIFY
371# include <sys/utsname.h>
372# include <sys/statfs.h>
373# include <sys/inotify.h>
374/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
375# ifndef IN_DONT_FOLLOW
376# undef EV_USE_INOTIFY
377# define EV_USE_INOTIFY 0
378# endif
379#endif
380
381#if EV_SELECT_IS_WINSOCKET
382# include <winsock.h>
383#endif
384
385#if EV_USE_EVENTFD
386/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
387# include <stdint.h>
388# ifndef EFD_NONBLOCK
389# define EFD_NONBLOCK O_NONBLOCK
390# endif
391# ifndef EFD_CLOEXEC
392# ifdef O_CLOEXEC
393# define EFD_CLOEXEC O_CLOEXEC
394# else
395# define EFD_CLOEXEC 02000000
20# endif 396# endif
21#endif 397# endif
22 398# ifdef __cplusplus
23#ifndef HAVE_SELECT 399extern "C" {
24# define HAVE_SELECT 1
25#endif 400# endif
26 401int eventfd (unsigned int initval, int flags);
27#ifndef HAVE_EPOLL 402# ifdef __cplusplus
28# define HAVE_EPOLL 0 403}
29#endif 404# endif
405#endif
30 406
31#ifndef HAVE_REALTIME 407#if EV_USE_SIGNALFD
32# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ 408/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
409# include <stdint.h>
410# ifndef SFD_NONBLOCK
411# define SFD_NONBLOCK O_NONBLOCK
33#endif 412# endif
413# ifndef SFD_CLOEXEC
414# ifdef O_CLOEXEC
415# define SFD_CLOEXEC O_CLOEXEC
416# else
417# define SFD_CLOEXEC 02000000
418# endif
419# endif
420# ifdef __cplusplus
421extern "C" {
422# endif
423int signalfd (int fd, const sigset_t *mask, int flags);
424
425struct signalfd_siginfo
426{
427 uint32_t ssi_signo;
428 char pad[128 - sizeof (uint32_t)];
429};
430# ifdef __cplusplus
431}
432# endif
433#endif
434
435
436/**/
437
438#if EV_VERIFY >= 3
439# define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
440#else
441# define EV_FREQUENT_CHECK do { } while (0)
442#endif
443
444/*
445 * This is used to avoid floating point rounding problems.
446 * It is added to ev_rt_now when scheduling periodics
447 * to ensure progress, time-wise, even when rounding
448 * errors are against us.
449 * This value is good at least till the year 4000.
450 * Better solutions welcome.
451 */
452#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
34 453
35#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 454#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
36#define MAX_BLOCKTIME 60. 455#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
37 456
38#include "ev.h" 457#if __GNUC__ >= 4
458# define expect(expr,value) __builtin_expect ((expr),(value))
459# define noinline __attribute__ ((noinline))
460#else
461# define expect(expr,value) (expr)
462# define noinline
463# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
464# define inline
465# endif
466#endif
39 467
468#define expect_false(expr) expect ((expr) != 0, 0)
469#define expect_true(expr) expect ((expr) != 0, 1)
470#define inline_size static inline
471
472#if EV_MINIMAL
473# define inline_speed static noinline
474#else
475# define inline_speed static inline
476#endif
477
478#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
479
480#if EV_MINPRI == EV_MAXPRI
481# define ABSPRI(w) (((W)w), 0)
482#else
483# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
484#endif
485
486#define EMPTY /* required for microsofts broken pseudo-c compiler */
487#define EMPTY2(a,b) /* used to suppress some warnings */
488
40typedef struct ev_watcher *W; 489typedef ev_watcher *W;
41typedef struct ev_watcher_list *WL; 490typedef ev_watcher_list *WL;
42typedef struct ev_watcher_time *WT; 491typedef ev_watcher_time *WT;
43 492
44static ev_tstamp now, diff; /* monotonic clock */ 493#define ev_active(w) ((W)(w))->active
45ev_tstamp ev_now; 494#define ev_at(w) ((WT)(w))->at
46int ev_method;
47 495
48static int have_monotonic; /* runtime */ 496#if EV_USE_REALTIME
497/* sig_atomic_t is used to avoid per-thread variables or locking but still */
498/* giving it a reasonably high chance of working on typical architetcures */
499static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
500#endif
49 501
50static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 502#if EV_USE_MONOTONIC
51static void (*method_modify)(int fd, int oev, int nev); 503static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
52static void (*method_poll)(ev_tstamp timeout); 504#endif
505
506#ifndef EV_FD_TO_WIN32_HANDLE
507# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
508#endif
509#ifndef EV_WIN32_HANDLE_TO_FD
510# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (fd, 0)
511#endif
512#ifndef EV_WIN32_CLOSE_FD
513# define EV_WIN32_CLOSE_FD(fd) close (fd)
514#endif
515
516#ifdef _WIN32
517# include "ev_win32.c"
518#endif
53 519
54/*****************************************************************************/ 520/*****************************************************************************/
55 521
522static void (*syserr_cb)(const char *msg);
523
524void
525ev_set_syserr_cb (void (*cb)(const char *msg))
526{
527 syserr_cb = cb;
528}
529
530static void noinline
531ev_syserr (const char *msg)
532{
533 if (!msg)
534 msg = "(libev) system error";
535
536 if (syserr_cb)
537 syserr_cb (msg);
538 else
539 {
540 perror (msg);
541 abort ();
542 }
543}
544
545static void *
546ev_realloc_emul (void *ptr, long size)
547{
548 /* some systems, notably openbsd and darwin, fail to properly
549 * implement realloc (x, 0) (as required by both ansi c-98 and
550 * the single unix specification, so work around them here.
551 */
552
553 if (size)
554 return realloc (ptr, size);
555
556 free (ptr);
557 return 0;
558}
559
560static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
561
562void
563ev_set_allocator (void *(*cb)(void *ptr, long size))
564{
565 alloc = cb;
566}
567
568inline_speed void *
569ev_realloc (void *ptr, long size)
570{
571 ptr = alloc (ptr, size);
572
573 if (!ptr && size)
574 {
575 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
576 abort ();
577 }
578
579 return ptr;
580}
581
582#define ev_malloc(size) ev_realloc (0, (size))
583#define ev_free(ptr) ev_realloc ((ptr), 0)
584
585/*****************************************************************************/
586
587/* set in reify when reification needed */
588#define EV_ANFD_REIFY 1
589
590/* file descriptor info structure */
591typedef struct
592{
593 WL head;
594 unsigned char events; /* the events watched for */
595 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
596 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
597 unsigned char unused;
598#if EV_USE_EPOLL
599 unsigned int egen; /* generation counter to counter epoll bugs */
600#endif
601#if EV_SELECT_IS_WINSOCKET
602 SOCKET handle;
603#endif
604} ANFD;
605
606/* stores the pending event set for a given watcher */
607typedef struct
608{
609 W w;
610 int events; /* the pending event set for the given watcher */
611} ANPENDING;
612
613#if EV_USE_INOTIFY
614/* hash table entry per inotify-id */
615typedef struct
616{
617 WL head;
618} ANFS;
619#endif
620
621/* Heap Entry */
622#if EV_HEAP_CACHE_AT
623 /* a heap element */
624 typedef struct {
625 ev_tstamp at;
626 WT w;
627 } ANHE;
628
629 #define ANHE_w(he) (he).w /* access watcher, read-write */
630 #define ANHE_at(he) (he).at /* access cached at, read-only */
631 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
632#else
633 /* a heap element */
634 typedef WT ANHE;
635
636 #define ANHE_w(he) (he)
637 #define ANHE_at(he) (he)->at
638 #define ANHE_at_cache(he)
639#endif
640
641#if EV_MULTIPLICITY
642
643 struct ev_loop
644 {
645 ev_tstamp ev_rt_now;
646 #define ev_rt_now ((loop)->ev_rt_now)
647 #define VAR(name,decl) decl;
648 #include "ev_vars.h"
649 #undef VAR
650 };
651 #include "ev_wrap.h"
652
653 static struct ev_loop default_loop_struct;
654 struct ev_loop *ev_default_loop_ptr;
655
656#else
657
658 ev_tstamp ev_rt_now;
659 #define VAR(name,decl) static decl;
660 #include "ev_vars.h"
661 #undef VAR
662
663 static int ev_default_loop_ptr;
664
665#endif
666
667#if EV_MINIMAL < 2
668# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
669# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
670# define EV_INVOKE_PENDING invoke_cb (EV_A)
671#else
672# define EV_RELEASE_CB (void)0
673# define EV_ACQUIRE_CB (void)0
674# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
675#endif
676
677#define EVUNLOOP_RECURSE 0x80
678
679/*****************************************************************************/
680
681#ifndef EV_HAVE_EV_TIME
56ev_tstamp 682ev_tstamp
57ev_time (void) 683ev_time (void)
58{ 684{
59#if HAVE_REALTIME 685#if EV_USE_REALTIME
686 if (expect_true (have_realtime))
687 {
60 struct timespec ts; 688 struct timespec ts;
61 clock_gettime (CLOCK_REALTIME, &ts); 689 clock_gettime (CLOCK_REALTIME, &ts);
62 return ts.tv_sec + ts.tv_nsec * 1e-9; 690 return ts.tv_sec + ts.tv_nsec * 1e-9;
63#else 691 }
692#endif
693
64 struct timeval tv; 694 struct timeval tv;
65 gettimeofday (&tv, 0); 695 gettimeofday (&tv, 0);
66 return tv.tv_sec + tv.tv_usec * 1e-6; 696 return tv.tv_sec + tv.tv_usec * 1e-6;
67#endif
68} 697}
698#endif
69 699
70static ev_tstamp 700inline_size ev_tstamp
71get_clock (void) 701get_clock (void)
72{ 702{
73#if HAVE_MONOTONIC 703#if EV_USE_MONOTONIC
74 if (have_monotonic) 704 if (expect_true (have_monotonic))
75 { 705 {
76 struct timespec ts; 706 struct timespec ts;
77 clock_gettime (CLOCK_MONOTONIC, &ts); 707 clock_gettime (CLOCK_MONOTONIC, &ts);
78 return ts.tv_sec + ts.tv_nsec * 1e-9; 708 return ts.tv_sec + ts.tv_nsec * 1e-9;
79 } 709 }
80#endif 710#endif
81 711
82 return ev_time (); 712 return ev_time ();
83} 713}
84 714
85#define array_needsize(base,cur,cnt,init) \ 715#if EV_MULTIPLICITY
86 if ((cnt) > cur) \ 716ev_tstamp
87 { \ 717ev_now (EV_P)
88 int newcnt = cur ? cur << 1 : 16; \ 718{
89 base = realloc (base, sizeof (*base) * (newcnt)); \ 719 return ev_rt_now;
90 init (base + cur, newcnt - cur); \ 720}
91 cur = newcnt; \ 721#endif
722
723void
724ev_sleep (ev_tstamp delay)
725{
726 if (delay > 0.)
92 } 727 {
728#if EV_USE_NANOSLEEP
729 struct timespec ts;
730
731 ts.tv_sec = (time_t)delay;
732 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
733
734 nanosleep (&ts, 0);
735#elif defined(_WIN32)
736 Sleep ((unsigned long)(delay * 1e3));
737#else
738 struct timeval tv;
739
740 tv.tv_sec = (time_t)delay;
741 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
742
743 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
744 /* something not guaranteed by newer posix versions, but guaranteed */
745 /* by older ones */
746 select (0, 0, 0, 0, &tv);
747#endif
748 }
749}
93 750
94/*****************************************************************************/ 751/*****************************************************************************/
95 752
96typedef struct 753#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
97{
98 struct ev_io *head;
99 unsigned char wev, rev; /* want, received event set */
100} ANFD;
101 754
102static ANFD *anfds; 755/* find a suitable new size for the given array, */
103static int anfdmax; 756/* hopefully by rounding to a ncie-to-malloc size */
104 757inline_size int
105static int *fdchanges; 758array_nextsize (int elem, int cur, int cnt)
106static int fdchangemax, fdchangecnt;
107
108static void
109anfds_init (ANFD *base, int count)
110{ 759{
111 while (count--) 760 int ncur = cur + 1;
112 { 761
113 base->head = 0; 762 do
114 base->wev = base->rev = EV_NONE; 763 ncur <<= 1;
115 ++base; 764 while (cnt > ncur);
765
766 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
767 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
116 } 768 {
117} 769 ncur *= elem;
118 770 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
119typedef struct 771 ncur = ncur - sizeof (void *) * 4;
120{ 772 ncur /= elem;
121 W w;
122 int events;
123} ANPENDING;
124
125static ANPENDING *pendings;
126static int pendingmax, pendingcnt;
127
128static void
129event (W w, int events)
130{
131 if (w->active)
132 { 773 }
774
775 return ncur;
776}
777
778static noinline void *
779array_realloc (int elem, void *base, int *cur, int cnt)
780{
781 *cur = array_nextsize (elem, *cur, cnt);
782 return ev_realloc (base, elem * *cur);
783}
784
785#define array_init_zero(base,count) \
786 memset ((void *)(base), 0, sizeof (*(base)) * (count))
787
788#define array_needsize(type,base,cur,cnt,init) \
789 if (expect_false ((cnt) > (cur))) \
790 { \
791 int ocur_ = (cur); \
792 (base) = (type *)array_realloc \
793 (sizeof (type), (base), &(cur), (cnt)); \
794 init ((base) + (ocur_), (cur) - ocur_); \
795 }
796
797#if 0
798#define array_slim(type,stem) \
799 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
800 { \
801 stem ## max = array_roundsize (stem ## cnt >> 1); \
802 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
803 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
804 }
805#endif
806
807#define array_free(stem, idx) \
808 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
809
810/*****************************************************************************/
811
812/* dummy callback for pending events */
813static void noinline
814pendingcb (EV_P_ ev_prepare *w, int revents)
815{
816}
817
818void noinline
819ev_feed_event (EV_P_ void *w, int revents)
820{
821 W w_ = (W)w;
822 int pri = ABSPRI (w_);
823
824 if (expect_false (w_->pending))
825 pendings [pri][w_->pending - 1].events |= revents;
826 else
827 {
133 w->pending = ++pendingcnt; 828 w_->pending = ++pendingcnt [pri];
134 array_needsize (pendings, pendingmax, pendingcnt, ); 829 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
135 pendings [pendingcnt - 1].w = w; 830 pendings [pri][w_->pending - 1].w = w_;
136 pendings [pendingcnt - 1].events = events; 831 pendings [pri][w_->pending - 1].events = revents;
137 } 832 }
138} 833}
139 834
140static void 835inline_speed void
836feed_reverse (EV_P_ W w)
837{
838 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
839 rfeeds [rfeedcnt++] = w;
840}
841
842inline_size void
843feed_reverse_done (EV_P_ int revents)
844{
845 do
846 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
847 while (rfeedcnt);
848}
849
850inline_speed void
851queue_events (EV_P_ W *events, int eventcnt, int type)
852{
853 int i;
854
855 for (i = 0; i < eventcnt; ++i)
856 ev_feed_event (EV_A_ events [i], type);
857}
858
859/*****************************************************************************/
860
861inline_speed void
141fd_event (int fd, int events) 862fd_event_nc (EV_P_ int fd, int revents)
142{ 863{
143 ANFD *anfd = anfds + fd; 864 ANFD *anfd = anfds + fd;
144 struct ev_io *w; 865 ev_io *w;
145 866
146 for (w = anfd->head; w; w = w->next) 867 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
147 { 868 {
148 int ev = w->events & events; 869 int ev = w->events & revents;
149 870
150 if (ev) 871 if (ev)
151 event ((W)w, ev); 872 ev_feed_event (EV_A_ (W)w, ev);
152 }
153}
154
155static void
156queue_events (W *events, int eventcnt, int type)
157{
158 int i;
159
160 for (i = 0; i < eventcnt; ++i)
161 event (events [i], type);
162}
163
164/*****************************************************************************/
165
166static struct ev_timer **timers;
167static int timermax, timercnt;
168
169static struct ev_periodic **periodics;
170static int periodicmax, periodiccnt;
171
172static void
173upheap (WT *timers, int k)
174{
175 WT w = timers [k];
176
177 while (k && timers [k >> 1]->at > w->at)
178 {
179 timers [k] = timers [k >> 1];
180 timers [k]->active = k + 1;
181 k >>= 1;
182 }
183
184 timers [k] = w;
185 timers [k]->active = k + 1;
186
187}
188
189static void
190downheap (WT *timers, int N, int k)
191{
192 WT w = timers [k];
193
194 while (k < (N >> 1))
195 {
196 int j = k << 1;
197
198 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
199 ++j;
200
201 if (w->at <= timers [j]->at)
202 break;
203
204 timers [k] = timers [j];
205 timers [k]->active = k + 1;
206 k = j;
207 }
208
209 timers [k] = w;
210 timers [k]->active = k + 1;
211}
212
213/*****************************************************************************/
214
215typedef struct
216{
217 struct ev_signal *head;
218 sig_atomic_t gotsig;
219} ANSIG;
220
221static ANSIG *signals;
222static int signalmax;
223
224static int sigpipe [2];
225static sig_atomic_t gotsig;
226static struct ev_io sigev;
227
228static void
229signals_init (ANSIG *base, int count)
230{
231 while (count--)
232 {
233 base->head = 0;
234 base->gotsig = 0;
235 ++base;
236 }
237}
238
239static void
240sighandler (int signum)
241{
242 signals [signum - 1].gotsig = 1;
243
244 if (!gotsig)
245 {
246 gotsig = 1;
247 write (sigpipe [1], &gotsig, 1);
248 }
249}
250
251static void
252sigcb (struct ev_io *iow, int revents)
253{
254 struct ev_signal *w;
255 int sig;
256
257 gotsig = 0;
258 read (sigpipe [0], &revents, 1);
259
260 for (sig = signalmax; sig--; )
261 if (signals [sig].gotsig)
262 {
263 signals [sig].gotsig = 0;
264
265 for (w = signals [sig].head; w; w = w->next)
266 event ((W)w, EV_SIGNAL);
267 } 873 }
268} 874}
269 875
270static void 876/* do not submit kernel events for fds that have reify set */
271siginit (void) 877/* because that means they changed while we were polling for new events */
878inline_speed void
879fd_event (EV_P_ int fd, int revents)
272{ 880{
273 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); 881 ANFD *anfd = anfds + fd;
274 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
275 882
276 /* rather than sort out wether we really need nb, set it */ 883 if (expect_true (!anfd->reify))
277 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 884 fd_event_nc (EV_A_ fd, revents);
278 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
279
280 evio_set (&sigev, sigpipe [0], EV_READ);
281 evio_start (&sigev);
282} 885}
283 886
284/*****************************************************************************/ 887void
285 888ev_feed_fd_event (EV_P_ int fd, int revents)
286static struct ev_idle **idles;
287static int idlemax, idlecnt;
288
289static struct ev_check **checks;
290static int checkmax, checkcnt;
291
292/*****************************************************************************/
293
294#if HAVE_EPOLL
295# include "ev_epoll.c"
296#endif
297#if HAVE_SELECT
298# include "ev_select.c"
299#endif
300
301int ev_init (int flags)
302{ 889{
303#if HAVE_MONOTONIC 890 if (fd >= 0 && fd < anfdmax)
304 { 891 fd_event_nc (EV_A_ fd, revents);
305 struct timespec ts;
306 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
307 have_monotonic = 1;
308 }
309#endif
310
311 ev_now = ev_time ();
312 now = get_clock ();
313 diff = ev_now - now;
314
315 if (pipe (sigpipe))
316 return 0;
317
318 ev_method = EVMETHOD_NONE;
319#if HAVE_EPOLL
320 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
321#endif
322#if HAVE_SELECT
323 if (ev_method == EVMETHOD_NONE) select_init (flags);
324#endif
325
326 if (ev_method)
327 {
328 evw_init (&sigev, sigcb);
329 siginit ();
330 }
331
332 return ev_method;
333} 892}
334 893
335/*****************************************************************************/ 894/* make sure the external fd watch events are in-sync */
336 895/* with the kernel/libev internal state */
337void ev_prefork (void) 896inline_size void
338{ 897fd_reify (EV_P)
339 /* nop */
340}
341
342void ev_postfork_parent (void)
343{
344 /* nop */
345}
346
347void ev_postfork_child (void)
348{
349#if HAVE_EPOLL
350 if (ev_method == EVMETHOD_EPOLL)
351 epoll_postfork_child ();
352#endif
353
354 evio_stop (&sigev);
355 close (sigpipe [0]);
356 close (sigpipe [1]);
357 pipe (sigpipe);
358 siginit ();
359}
360
361/*****************************************************************************/
362
363static void
364fd_reify (void)
365{ 898{
366 int i; 899 int i;
367 900
368 for (i = 0; i < fdchangecnt; ++i) 901 for (i = 0; i < fdchangecnt; ++i)
369 { 902 {
370 int fd = fdchanges [i]; 903 int fd = fdchanges [i];
371 ANFD *anfd = anfds + fd; 904 ANFD *anfd = anfds + fd;
372 struct ev_io *w; 905 ev_io *w;
373 906
374 int wev = 0; 907 unsigned char events = 0;
375 908
376 for (w = anfd->head; w; w = w->next) 909 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
377 wev |= w->events; 910 events |= (unsigned char)w->events;
378 911
379 if (anfd->wev != wev) 912#if EV_SELECT_IS_WINSOCKET
913 if (events)
380 { 914 {
381 method_modify (fd, anfd->wev, wev); 915 unsigned long arg;
382 anfd->wev = wev; 916 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
917 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
383 } 918 }
919#endif
920
921 {
922 unsigned char o_events = anfd->events;
923 unsigned char o_reify = anfd->reify;
924
925 anfd->reify = 0;
926 anfd->events = events;
927
928 if (o_events != events || o_reify & EV__IOFDSET)
929 backend_modify (EV_A_ fd, o_events, events);
930 }
384 } 931 }
385 932
386 fdchangecnt = 0; 933 fdchangecnt = 0;
387} 934}
388 935
936/* something about the given fd changed */
937inline_size void
938fd_change (EV_P_ int fd, int flags)
939{
940 unsigned char reify = anfds [fd].reify;
941 anfds [fd].reify |= flags;
942
943 if (expect_true (!reify))
944 {
945 ++fdchangecnt;
946 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
947 fdchanges [fdchangecnt - 1] = fd;
948 }
949}
950
951/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
952inline_speed void
953fd_kill (EV_P_ int fd)
954{
955 ev_io *w;
956
957 while ((w = (ev_io *)anfds [fd].head))
958 {
959 ev_io_stop (EV_A_ w);
960 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
961 }
962}
963
964/* check whether the given fd is atcually valid, for error recovery */
965inline_size int
966fd_valid (int fd)
967{
968#ifdef _WIN32
969 return _get_osfhandle (fd) != -1;
970#else
971 return fcntl (fd, F_GETFD) != -1;
972#endif
973}
974
975/* called on EBADF to verify fds */
976static void noinline
977fd_ebadf (EV_P)
978{
979 int fd;
980
981 for (fd = 0; fd < anfdmax; ++fd)
982 if (anfds [fd].events)
983 if (!fd_valid (fd) && errno == EBADF)
984 fd_kill (EV_A_ fd);
985}
986
987/* called on ENOMEM in select/poll to kill some fds and retry */
988static void noinline
989fd_enomem (EV_P)
990{
991 int fd;
992
993 for (fd = anfdmax; fd--; )
994 if (anfds [fd].events)
995 {
996 fd_kill (EV_A_ fd);
997 break;
998 }
999}
1000
1001/* usually called after fork if backend needs to re-arm all fds from scratch */
1002static void noinline
1003fd_rearm_all (EV_P)
1004{
1005 int fd;
1006
1007 for (fd = 0; fd < anfdmax; ++fd)
1008 if (anfds [fd].events)
1009 {
1010 anfds [fd].events = 0;
1011 anfds [fd].emask = 0;
1012 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1013 }
1014}
1015
1016/*****************************************************************************/
1017
1018/*
1019 * the heap functions want a real array index. array index 0 uis guaranteed to not
1020 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1021 * the branching factor of the d-tree.
1022 */
1023
1024/*
1025 * at the moment we allow libev the luxury of two heaps,
1026 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1027 * which is more cache-efficient.
1028 * the difference is about 5% with 50000+ watchers.
1029 */
1030#if EV_USE_4HEAP
1031
1032#define DHEAP 4
1033#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1034#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1035#define UPHEAP_DONE(p,k) ((p) == (k))
1036
1037/* away from the root */
1038inline_speed void
1039downheap (ANHE *heap, int N, int k)
1040{
1041 ANHE he = heap [k];
1042 ANHE *E = heap + N + HEAP0;
1043
1044 for (;;)
1045 {
1046 ev_tstamp minat;
1047 ANHE *minpos;
1048 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1049
1050 /* find minimum child */
1051 if (expect_true (pos + DHEAP - 1 < E))
1052 {
1053 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1054 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1055 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1056 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1057 }
1058 else if (pos < E)
1059 {
1060 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1061 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1062 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1063 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1064 }
1065 else
1066 break;
1067
1068 if (ANHE_at (he) <= minat)
1069 break;
1070
1071 heap [k] = *minpos;
1072 ev_active (ANHE_w (*minpos)) = k;
1073
1074 k = minpos - heap;
1075 }
1076
1077 heap [k] = he;
1078 ev_active (ANHE_w (he)) = k;
1079}
1080
1081#else /* 4HEAP */
1082
1083#define HEAP0 1
1084#define HPARENT(k) ((k) >> 1)
1085#define UPHEAP_DONE(p,k) (!(p))
1086
1087/* away from the root */
1088inline_speed void
1089downheap (ANHE *heap, int N, int k)
1090{
1091 ANHE he = heap [k];
1092
1093 for (;;)
1094 {
1095 int c = k << 1;
1096
1097 if (c >= N + HEAP0)
1098 break;
1099
1100 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1101 ? 1 : 0;
1102
1103 if (ANHE_at (he) <= ANHE_at (heap [c]))
1104 break;
1105
1106 heap [k] = heap [c];
1107 ev_active (ANHE_w (heap [k])) = k;
1108
1109 k = c;
1110 }
1111
1112 heap [k] = he;
1113 ev_active (ANHE_w (he)) = k;
1114}
1115#endif
1116
1117/* towards the root */
1118inline_speed void
1119upheap (ANHE *heap, int k)
1120{
1121 ANHE he = heap [k];
1122
1123 for (;;)
1124 {
1125 int p = HPARENT (k);
1126
1127 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1128 break;
1129
1130 heap [k] = heap [p];
1131 ev_active (ANHE_w (heap [k])) = k;
1132 k = p;
1133 }
1134
1135 heap [k] = he;
1136 ev_active (ANHE_w (he)) = k;
1137}
1138
1139/* move an element suitably so it is in a correct place */
1140inline_size void
1141adjustheap (ANHE *heap, int N, int k)
1142{
1143 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1144 upheap (heap, k);
1145 else
1146 downheap (heap, N, k);
1147}
1148
1149/* rebuild the heap: this function is used only once and executed rarely */
1150inline_size void
1151reheap (ANHE *heap, int N)
1152{
1153 int i;
1154
1155 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1156 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1157 for (i = 0; i < N; ++i)
1158 upheap (heap, i + HEAP0);
1159}
1160
1161/*****************************************************************************/
1162
1163/* associate signal watchers to a signal signal */
1164typedef struct
1165{
1166 EV_ATOMIC_T pending;
1167#if EV_MULTIPLICITY
1168 EV_P;
1169#endif
1170 WL head;
1171} ANSIG;
1172
1173static ANSIG signals [EV_NSIG - 1];
1174
1175/*****************************************************************************/
1176
1177/* used to prepare libev internal fd's */
1178/* this is not fork-safe */
1179inline_speed void
1180fd_intern (int fd)
1181{
1182#ifdef _WIN32
1183 unsigned long arg = 1;
1184 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
1185#else
1186 fcntl (fd, F_SETFD, FD_CLOEXEC);
1187 fcntl (fd, F_SETFL, O_NONBLOCK);
1188#endif
1189}
1190
1191static void noinline
1192evpipe_init (EV_P)
1193{
1194 if (!ev_is_active (&pipe_w))
1195 {
1196#if EV_USE_EVENTFD
1197 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1198 if (evfd < 0 && errno == EINVAL)
1199 evfd = eventfd (0, 0);
1200
1201 if (evfd >= 0)
1202 {
1203 evpipe [0] = -1;
1204 fd_intern (evfd); /* doing it twice doesn't hurt */
1205 ev_io_set (&pipe_w, evfd, EV_READ);
1206 }
1207 else
1208#endif
1209 {
1210 while (pipe (evpipe))
1211 ev_syserr ("(libev) error creating signal/async pipe");
1212
1213 fd_intern (evpipe [0]);
1214 fd_intern (evpipe [1]);
1215 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1216 }
1217
1218 ev_io_start (EV_A_ &pipe_w);
1219 ev_unref (EV_A); /* watcher should not keep loop alive */
1220 }
1221}
1222
1223inline_size void
1224evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1225{
1226 if (!*flag)
1227 {
1228 int old_errno = errno; /* save errno because write might clobber it */
1229
1230 *flag = 1;
1231
1232#if EV_USE_EVENTFD
1233 if (evfd >= 0)
1234 {
1235 uint64_t counter = 1;
1236 write (evfd, &counter, sizeof (uint64_t));
1237 }
1238 else
1239#endif
1240 write (evpipe [1], &old_errno, 1);
1241
1242 errno = old_errno;
1243 }
1244}
1245
1246/* called whenever the libev signal pipe */
1247/* got some events (signal, async) */
389static void 1248static void
390call_pending () 1249pipecb (EV_P_ ev_io *iow, int revents)
391{ 1250{
392 int i; 1251 int i;
393 1252
394 for (i = 0; i < pendingcnt; ++i) 1253#if EV_USE_EVENTFD
1254 if (evfd >= 0)
1255 {
1256 uint64_t counter;
1257 read (evfd, &counter, sizeof (uint64_t));
395 { 1258 }
396 ANPENDING *p = pendings + i; 1259 else
1260#endif
1261 {
1262 char dummy;
1263 read (evpipe [0], &dummy, 1);
1264 }
397 1265
398 if (p->w) 1266 if (sig_pending)
1267 {
1268 sig_pending = 0;
1269
1270 for (i = EV_NSIG - 1; i--; )
1271 if (expect_false (signals [i].pending))
1272 ev_feed_signal_event (EV_A_ i + 1);
1273 }
1274
1275#if EV_ASYNC_ENABLE
1276 if (async_pending)
1277 {
1278 async_pending = 0;
1279
1280 for (i = asynccnt; i--; )
1281 if (asyncs [i]->sent)
1282 {
1283 asyncs [i]->sent = 0;
1284 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1285 }
1286 }
1287#endif
1288}
1289
1290/*****************************************************************************/
1291
1292static void
1293ev_sighandler (int signum)
1294{
1295#if EV_MULTIPLICITY
1296 EV_P = signals [signum - 1].loop;
1297#endif
1298
1299#if _WIN32
1300 signal (signum, ev_sighandler);
1301#endif
1302
1303 signals [signum - 1].pending = 1;
1304 evpipe_write (EV_A_ &sig_pending);
1305}
1306
1307void noinline
1308ev_feed_signal_event (EV_P_ int signum)
1309{
1310 WL w;
1311
1312 if (expect_false (signum <= 0 || signum > EV_NSIG))
1313 return;
1314
1315 --signum;
1316
1317#if EV_MULTIPLICITY
1318 /* it is permissible to try to feed a signal to the wrong loop */
1319 /* or, likely more useful, feeding a signal nobody is waiting for */
1320
1321 if (expect_false (signals [signum].loop != EV_A))
1322 return;
1323#endif
1324
1325 signals [signum].pending = 0;
1326
1327 for (w = signals [signum].head; w; w = w->next)
1328 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1329}
1330
1331#if EV_USE_SIGNALFD
1332static void
1333sigfdcb (EV_P_ ev_io *iow, int revents)
1334{
1335 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1336
1337 for (;;)
1338 {
1339 ssize_t res = read (sigfd, si, sizeof (si));
1340
1341 /* not ISO-C, as res might be -1, but works with SuS */
1342 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1343 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1344
1345 if (res < (ssize_t)sizeof (si))
1346 break;
1347 }
1348}
1349#endif
1350
1351/*****************************************************************************/
1352
1353static WL childs [EV_PID_HASHSIZE];
1354
1355#ifndef _WIN32
1356
1357static ev_signal childev;
1358
1359#ifndef WIFCONTINUED
1360# define WIFCONTINUED(status) 0
1361#endif
1362
1363/* handle a single child status event */
1364inline_speed void
1365child_reap (EV_P_ int chain, int pid, int status)
1366{
1367 ev_child *w;
1368 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1369
1370 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1371 {
1372 if ((w->pid == pid || !w->pid)
1373 && (!traced || (w->flags & 1)))
399 { 1374 {
400 p->w->pending = 0; 1375 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
401 p->w->cb (p->w, p->events); 1376 w->rpid = pid;
1377 w->rstatus = status;
1378 ev_feed_event (EV_A_ (W)w, EV_CHILD);
402 } 1379 }
403 } 1380 }
404
405 pendingcnt = 0;
406} 1381}
407 1382
1383#ifndef WCONTINUED
1384# define WCONTINUED 0
1385#endif
1386
1387/* called on sigchld etc., calls waitpid */
408static void 1388static void
1389childcb (EV_P_ ev_signal *sw, int revents)
1390{
1391 int pid, status;
1392
1393 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1394 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1395 if (!WCONTINUED
1396 || errno != EINVAL
1397 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1398 return;
1399
1400 /* make sure we are called again until all children have been reaped */
1401 /* we need to do it this way so that the callback gets called before we continue */
1402 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1403
1404 child_reap (EV_A_ pid, pid, status);
1405 if (EV_PID_HASHSIZE > 1)
1406 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1407}
1408
1409#endif
1410
1411/*****************************************************************************/
1412
1413#if EV_USE_PORT
1414# include "ev_port.c"
1415#endif
1416#if EV_USE_KQUEUE
1417# include "ev_kqueue.c"
1418#endif
1419#if EV_USE_EPOLL
1420# include "ev_epoll.c"
1421#endif
1422#if EV_USE_POLL
1423# include "ev_poll.c"
1424#endif
1425#if EV_USE_SELECT
1426# include "ev_select.c"
1427#endif
1428
1429int
1430ev_version_major (void)
1431{
1432 return EV_VERSION_MAJOR;
1433}
1434
1435int
1436ev_version_minor (void)
1437{
1438 return EV_VERSION_MINOR;
1439}
1440
1441/* return true if we are running with elevated privileges and should ignore env variables */
1442int inline_size
1443enable_secure (void)
1444{
1445#ifdef _WIN32
1446 return 0;
1447#else
1448 return getuid () != geteuid ()
1449 || getgid () != getegid ();
1450#endif
1451}
1452
1453unsigned int
1454ev_supported_backends (void)
1455{
1456 unsigned int flags = 0;
1457
1458 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1459 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1460 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1461 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1462 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1463
1464 return flags;
1465}
1466
1467unsigned int
1468ev_recommended_backends (void)
1469{
1470 unsigned int flags = ev_supported_backends ();
1471
1472#ifndef __NetBSD__
1473 /* kqueue is borked on everything but netbsd apparently */
1474 /* it usually doesn't work correctly on anything but sockets and pipes */
1475 flags &= ~EVBACKEND_KQUEUE;
1476#endif
1477#ifdef __APPLE__
1478 /* only select works correctly on that "unix-certified" platform */
1479 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1480 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1481#endif
1482
1483 return flags;
1484}
1485
1486unsigned int
1487ev_embeddable_backends (void)
1488{
1489 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1490
1491 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1492 /* please fix it and tell me how to detect the fix */
1493 flags &= ~EVBACKEND_EPOLL;
1494
1495 return flags;
1496}
1497
1498unsigned int
1499ev_backend (EV_P)
1500{
1501 return backend;
1502}
1503
1504#if EV_MINIMAL < 2
1505unsigned int
1506ev_loop_count (EV_P)
1507{
1508 return loop_count;
1509}
1510
1511unsigned int
1512ev_loop_depth (EV_P)
1513{
1514 return loop_depth;
1515}
1516
1517void
1518ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1519{
1520 io_blocktime = interval;
1521}
1522
1523void
1524ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1525{
1526 timeout_blocktime = interval;
1527}
1528
1529void
1530ev_set_userdata (EV_P_ void *data)
1531{
1532 userdata = data;
1533}
1534
1535void *
1536ev_userdata (EV_P)
1537{
1538 return userdata;
1539}
1540
1541void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1542{
1543 invoke_cb = invoke_pending_cb;
1544}
1545
1546void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1547{
1548 release_cb = release;
1549 acquire_cb = acquire;
1550}
1551#endif
1552
1553/* initialise a loop structure, must be zero-initialised */
1554static void noinline
1555loop_init (EV_P_ unsigned int flags)
1556{
1557 if (!backend)
1558 {
1559#if EV_USE_REALTIME
1560 if (!have_realtime)
1561 {
1562 struct timespec ts;
1563
1564 if (!clock_gettime (CLOCK_REALTIME, &ts))
1565 have_realtime = 1;
1566 }
1567#endif
1568
1569#if EV_USE_MONOTONIC
1570 if (!have_monotonic)
1571 {
1572 struct timespec ts;
1573
1574 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1575 have_monotonic = 1;
1576 }
1577#endif
1578
1579 /* pid check not overridable via env */
1580#ifndef _WIN32
1581 if (flags & EVFLAG_FORKCHECK)
1582 curpid = getpid ();
1583#endif
1584
1585 if (!(flags & EVFLAG_NOENV)
1586 && !enable_secure ()
1587 && getenv ("LIBEV_FLAGS"))
1588 flags = atoi (getenv ("LIBEV_FLAGS"));
1589
1590 ev_rt_now = ev_time ();
1591 mn_now = get_clock ();
1592 now_floor = mn_now;
1593 rtmn_diff = ev_rt_now - mn_now;
1594#if EV_MINIMAL < 2
1595 invoke_cb = ev_invoke_pending;
1596#endif
1597
1598 io_blocktime = 0.;
1599 timeout_blocktime = 0.;
1600 backend = 0;
1601 backend_fd = -1;
1602 sig_pending = 0;
1603#if EV_ASYNC_ENABLE
1604 async_pending = 0;
1605#endif
1606#if EV_USE_INOTIFY
1607 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1608#endif
1609#if EV_USE_SIGNALFD
1610 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1611#endif
1612
1613 if (!(flags & 0x0000ffffU))
1614 flags |= ev_recommended_backends ();
1615
1616#if EV_USE_PORT
1617 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1618#endif
1619#if EV_USE_KQUEUE
1620 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1621#endif
1622#if EV_USE_EPOLL
1623 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1624#endif
1625#if EV_USE_POLL
1626 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1627#endif
1628#if EV_USE_SELECT
1629 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1630#endif
1631
1632 ev_prepare_init (&pending_w, pendingcb);
1633
1634 ev_init (&pipe_w, pipecb);
1635 ev_set_priority (&pipe_w, EV_MAXPRI);
1636 }
1637}
1638
1639/* free up a loop structure */
1640static void noinline
1641loop_destroy (EV_P)
1642{
1643 int i;
1644
1645 if (ev_is_active (&pipe_w))
1646 {
1647 /*ev_ref (EV_A);*/
1648 /*ev_io_stop (EV_A_ &pipe_w);*/
1649
1650#if EV_USE_EVENTFD
1651 if (evfd >= 0)
1652 close (evfd);
1653#endif
1654
1655 if (evpipe [0] >= 0)
1656 {
1657 EV_WIN32_CLOSE_FD (evpipe [0]);
1658 EV_WIN32_CLOSE_FD (evpipe [1]);
1659 }
1660 }
1661
1662#if EV_USE_SIGNALFD
1663 if (ev_is_active (&sigfd_w))
1664 close (sigfd);
1665#endif
1666
1667#if EV_USE_INOTIFY
1668 if (fs_fd >= 0)
1669 close (fs_fd);
1670#endif
1671
1672 if (backend_fd >= 0)
1673 close (backend_fd);
1674
1675#if EV_USE_PORT
1676 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1677#endif
1678#if EV_USE_KQUEUE
1679 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1680#endif
1681#if EV_USE_EPOLL
1682 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1683#endif
1684#if EV_USE_POLL
1685 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1686#endif
1687#if EV_USE_SELECT
1688 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1689#endif
1690
1691 for (i = NUMPRI; i--; )
1692 {
1693 array_free (pending, [i]);
1694#if EV_IDLE_ENABLE
1695 array_free (idle, [i]);
1696#endif
1697 }
1698
1699 ev_free (anfds); anfds = 0; anfdmax = 0;
1700
1701 /* have to use the microsoft-never-gets-it-right macro */
1702 array_free (rfeed, EMPTY);
1703 array_free (fdchange, EMPTY);
1704 array_free (timer, EMPTY);
1705#if EV_PERIODIC_ENABLE
1706 array_free (periodic, EMPTY);
1707#endif
1708#if EV_FORK_ENABLE
1709 array_free (fork, EMPTY);
1710#endif
1711 array_free (prepare, EMPTY);
1712 array_free (check, EMPTY);
1713#if EV_ASYNC_ENABLE
1714 array_free (async, EMPTY);
1715#endif
1716
1717 backend = 0;
1718}
1719
1720#if EV_USE_INOTIFY
1721inline_size void infy_fork (EV_P);
1722#endif
1723
1724inline_size void
1725loop_fork (EV_P)
1726{
1727#if EV_USE_PORT
1728 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1729#endif
1730#if EV_USE_KQUEUE
1731 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1732#endif
1733#if EV_USE_EPOLL
1734 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1735#endif
1736#if EV_USE_INOTIFY
1737 infy_fork (EV_A);
1738#endif
1739
1740 if (ev_is_active (&pipe_w))
1741 {
1742 /* this "locks" the handlers against writing to the pipe */
1743 /* while we modify the fd vars */
1744 sig_pending = 1;
1745#if EV_ASYNC_ENABLE
1746 async_pending = 1;
1747#endif
1748
1749 ev_ref (EV_A);
1750 ev_io_stop (EV_A_ &pipe_w);
1751
1752#if EV_USE_EVENTFD
1753 if (evfd >= 0)
1754 close (evfd);
1755#endif
1756
1757 if (evpipe [0] >= 0)
1758 {
1759 EV_WIN32_CLOSE_FD (evpipe [0]);
1760 EV_WIN32_CLOSE_FD (evpipe [1]);
1761 }
1762
1763 evpipe_init (EV_A);
1764 /* now iterate over everything, in case we missed something */
1765 pipecb (EV_A_ &pipe_w, EV_READ);
1766 }
1767
1768 postfork = 0;
1769}
1770
1771#if EV_MULTIPLICITY
1772
1773struct ev_loop *
1774ev_loop_new (unsigned int flags)
1775{
1776 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1777
1778 memset (EV_A, 0, sizeof (struct ev_loop));
1779 loop_init (EV_A_ flags);
1780
1781 if (ev_backend (EV_A))
1782 return EV_A;
1783
1784 return 0;
1785}
1786
1787void
1788ev_loop_destroy (EV_P)
1789{
1790 loop_destroy (EV_A);
1791 ev_free (loop);
1792}
1793
1794void
1795ev_loop_fork (EV_P)
1796{
1797 postfork = 1; /* must be in line with ev_default_fork */
1798}
1799#endif /* multiplicity */
1800
1801#if EV_VERIFY
1802static void noinline
1803verify_watcher (EV_P_ W w)
1804{
1805 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1806
1807 if (w->pending)
1808 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1809}
1810
1811static void noinline
1812verify_heap (EV_P_ ANHE *heap, int N)
1813{
1814 int i;
1815
1816 for (i = HEAP0; i < N + HEAP0; ++i)
1817 {
1818 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1819 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1820 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1821
1822 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1823 }
1824}
1825
1826static void noinline
1827array_verify (EV_P_ W *ws, int cnt)
1828{
1829 while (cnt--)
1830 {
1831 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1832 verify_watcher (EV_A_ ws [cnt]);
1833 }
1834}
1835#endif
1836
1837#if EV_MINIMAL < 2
1838void
1839ev_loop_verify (EV_P)
1840{
1841#if EV_VERIFY
1842 int i;
1843 WL w;
1844
1845 assert (activecnt >= -1);
1846
1847 assert (fdchangemax >= fdchangecnt);
1848 for (i = 0; i < fdchangecnt; ++i)
1849 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1850
1851 assert (anfdmax >= 0);
1852 for (i = 0; i < anfdmax; ++i)
1853 for (w = anfds [i].head; w; w = w->next)
1854 {
1855 verify_watcher (EV_A_ (W)w);
1856 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
1857 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1858 }
1859
1860 assert (timermax >= timercnt);
1861 verify_heap (EV_A_ timers, timercnt);
1862
1863#if EV_PERIODIC_ENABLE
1864 assert (periodicmax >= periodiccnt);
1865 verify_heap (EV_A_ periodics, periodiccnt);
1866#endif
1867
1868 for (i = NUMPRI; i--; )
1869 {
1870 assert (pendingmax [i] >= pendingcnt [i]);
1871#if EV_IDLE_ENABLE
1872 assert (idleall >= 0);
1873 assert (idlemax [i] >= idlecnt [i]);
1874 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1875#endif
1876 }
1877
1878#if EV_FORK_ENABLE
1879 assert (forkmax >= forkcnt);
1880 array_verify (EV_A_ (W *)forks, forkcnt);
1881#endif
1882
1883#if EV_ASYNC_ENABLE
1884 assert (asyncmax >= asynccnt);
1885 array_verify (EV_A_ (W *)asyncs, asynccnt);
1886#endif
1887
1888 assert (preparemax >= preparecnt);
1889 array_verify (EV_A_ (W *)prepares, preparecnt);
1890
1891 assert (checkmax >= checkcnt);
1892 array_verify (EV_A_ (W *)checks, checkcnt);
1893
1894# if 0
1895 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1896 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
1897# endif
1898#endif
1899}
1900#endif
1901
1902#if EV_MULTIPLICITY
1903struct ev_loop *
1904ev_default_loop_init (unsigned int flags)
1905#else
1906int
1907ev_default_loop (unsigned int flags)
1908#endif
1909{
1910 if (!ev_default_loop_ptr)
1911 {
1912#if EV_MULTIPLICITY
1913 EV_P = ev_default_loop_ptr = &default_loop_struct;
1914#else
1915 ev_default_loop_ptr = 1;
1916#endif
1917
1918 loop_init (EV_A_ flags);
1919
1920 if (ev_backend (EV_A))
1921 {
1922#ifndef _WIN32
1923 ev_signal_init (&childev, childcb, SIGCHLD);
1924 ev_set_priority (&childev, EV_MAXPRI);
1925 ev_signal_start (EV_A_ &childev);
1926 ev_unref (EV_A); /* child watcher should not keep loop alive */
1927#endif
1928 }
1929 else
1930 ev_default_loop_ptr = 0;
1931 }
1932
1933 return ev_default_loop_ptr;
1934}
1935
1936void
1937ev_default_destroy (void)
1938{
1939#if EV_MULTIPLICITY
1940 EV_P = ev_default_loop_ptr;
1941#endif
1942
1943 ev_default_loop_ptr = 0;
1944
1945#ifndef _WIN32
1946 ev_ref (EV_A); /* child watcher */
1947 ev_signal_stop (EV_A_ &childev);
1948#endif
1949
1950 loop_destroy (EV_A);
1951}
1952
1953void
1954ev_default_fork (void)
1955{
1956#if EV_MULTIPLICITY
1957 EV_P = ev_default_loop_ptr;
1958#endif
1959
1960 postfork = 1; /* must be in line with ev_loop_fork */
1961}
1962
1963/*****************************************************************************/
1964
1965void
1966ev_invoke (EV_P_ void *w, int revents)
1967{
1968 EV_CB_INVOKE ((W)w, revents);
1969}
1970
1971unsigned int
1972ev_pending_count (EV_P)
1973{
1974 int pri;
1975 unsigned int count = 0;
1976
1977 for (pri = NUMPRI; pri--; )
1978 count += pendingcnt [pri];
1979
1980 return count;
1981}
1982
1983void noinline
1984ev_invoke_pending (EV_P)
1985{
1986 int pri;
1987
1988 for (pri = NUMPRI; pri--; )
1989 while (pendingcnt [pri])
1990 {
1991 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1992
1993 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
1994 /* ^ this is no longer true, as pending_w could be here */
1995
1996 p->w->pending = 0;
1997 EV_CB_INVOKE (p->w, p->events);
1998 EV_FREQUENT_CHECK;
1999 }
2000}
2001
2002#if EV_IDLE_ENABLE
2003/* make idle watchers pending. this handles the "call-idle */
2004/* only when higher priorities are idle" logic */
2005inline_size void
2006idle_reify (EV_P)
2007{
2008 if (expect_false (idleall))
2009 {
2010 int pri;
2011
2012 for (pri = NUMPRI; pri--; )
2013 {
2014 if (pendingcnt [pri])
2015 break;
2016
2017 if (idlecnt [pri])
2018 {
2019 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2020 break;
2021 }
2022 }
2023 }
2024}
2025#endif
2026
2027/* make timers pending */
2028inline_size void
409timers_reify () 2029timers_reify (EV_P)
410{ 2030{
411 while (timercnt && timers [0]->at <= now) 2031 EV_FREQUENT_CHECK;
412 {
413 struct ev_timer *w = timers [0];
414 2032
415 event ((W)w, EV_TIMEOUT); 2033 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2034 {
2035 do
2036 {
2037 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
416 2038
2039 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2040
417 /* first reschedule or stop timer */ 2041 /* first reschedule or stop timer */
2042 if (w->repeat)
2043 {
2044 ev_at (w) += w->repeat;
2045 if (ev_at (w) < mn_now)
2046 ev_at (w) = mn_now;
2047
2048 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2049
2050 ANHE_at_cache (timers [HEAP0]);
2051 downheap (timers, timercnt, HEAP0);
2052 }
2053 else
2054 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2055
2056 EV_FREQUENT_CHECK;
2057 feed_reverse (EV_A_ (W)w);
2058 }
2059 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2060
2061 feed_reverse_done (EV_A_ EV_TIMEOUT);
2062 }
2063}
2064
2065#if EV_PERIODIC_ENABLE
2066/* make periodics pending */
2067inline_size void
2068periodics_reify (EV_P)
2069{
2070 EV_FREQUENT_CHECK;
2071
2072 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2073 {
2074 int feed_count = 0;
2075
2076 do
2077 {
2078 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2079
2080 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2081
2082 /* first reschedule or stop timer */
2083 if (w->reschedule_cb)
2084 {
2085 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2086
2087 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2088
2089 ANHE_at_cache (periodics [HEAP0]);
2090 downheap (periodics, periodiccnt, HEAP0);
2091 }
2092 else if (w->interval)
2093 {
2094 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2095 /* if next trigger time is not sufficiently in the future, put it there */
2096 /* this might happen because of floating point inexactness */
2097 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2098 {
2099 ev_at (w) += w->interval;
2100
2101 /* if interval is unreasonably low we might still have a time in the past */
2102 /* so correct this. this will make the periodic very inexact, but the user */
2103 /* has effectively asked to get triggered more often than possible */
2104 if (ev_at (w) < ev_rt_now)
2105 ev_at (w) = ev_rt_now;
2106 }
2107
2108 ANHE_at_cache (periodics [HEAP0]);
2109 downheap (periodics, periodiccnt, HEAP0);
2110 }
2111 else
2112 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2113
2114 EV_FREQUENT_CHECK;
2115 feed_reverse (EV_A_ (W)w);
2116 }
2117 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2118
2119 feed_reverse_done (EV_A_ EV_PERIODIC);
2120 }
2121}
2122
2123/* simply recalculate all periodics */
2124/* TODO: maybe ensure that at leats one event happens when jumping forward? */
2125static void noinline
2126periodics_reschedule (EV_P)
2127{
2128 int i;
2129
2130 /* adjust periodics after time jump */
2131 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2132 {
2133 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2134
2135 if (w->reschedule_cb)
2136 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2137 else if (w->interval)
2138 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2139
2140 ANHE_at_cache (periodics [i]);
2141 }
2142
2143 reheap (periodics, periodiccnt);
2144}
2145#endif
2146
2147/* adjust all timers by a given offset */
2148static void noinline
2149timers_reschedule (EV_P_ ev_tstamp adjust)
2150{
2151 int i;
2152
2153 for (i = 0; i < timercnt; ++i)
2154 {
2155 ANHE *he = timers + i + HEAP0;
2156 ANHE_w (*he)->at += adjust;
2157 ANHE_at_cache (*he);
2158 }
2159}
2160
2161/* fetch new monotonic and realtime times from the kernel */
2162/* also detetc if there was a timejump, and act accordingly */
2163inline_speed void
2164time_update (EV_P_ ev_tstamp max_block)
2165{
2166#if EV_USE_MONOTONIC
2167 if (expect_true (have_monotonic))
2168 {
2169 int i;
2170 ev_tstamp odiff = rtmn_diff;
2171
2172 mn_now = get_clock ();
2173
2174 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2175 /* interpolate in the meantime */
2176 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2177 {
2178 ev_rt_now = rtmn_diff + mn_now;
2179 return;
2180 }
2181
2182 now_floor = mn_now;
2183 ev_rt_now = ev_time ();
2184
2185 /* loop a few times, before making important decisions.
2186 * on the choice of "4": one iteration isn't enough,
2187 * in case we get preempted during the calls to
2188 * ev_time and get_clock. a second call is almost guaranteed
2189 * to succeed in that case, though. and looping a few more times
2190 * doesn't hurt either as we only do this on time-jumps or
2191 * in the unlikely event of having been preempted here.
2192 */
2193 for (i = 4; --i; )
2194 {
2195 rtmn_diff = ev_rt_now - mn_now;
2196
2197 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2198 return; /* all is well */
2199
2200 ev_rt_now = ev_time ();
2201 mn_now = get_clock ();
2202 now_floor = mn_now;
2203 }
2204
2205 /* no timer adjustment, as the monotonic clock doesn't jump */
2206 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2207# if EV_PERIODIC_ENABLE
2208 periodics_reschedule (EV_A);
2209# endif
2210 }
2211 else
2212#endif
2213 {
2214 ev_rt_now = ev_time ();
2215
2216 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2217 {
2218 /* adjust timers. this is easy, as the offset is the same for all of them */
2219 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2220#if EV_PERIODIC_ENABLE
2221 periodics_reschedule (EV_A);
2222#endif
2223 }
2224
2225 mn_now = ev_rt_now;
2226 }
2227}
2228
2229void
2230ev_loop (EV_P_ int flags)
2231{
2232#if EV_MINIMAL < 2
2233 ++loop_depth;
2234#endif
2235
2236 assert (("libev: ev_loop recursion during release detected", loop_done != EVUNLOOP_RECURSE));
2237
2238 loop_done = EVUNLOOP_CANCEL;
2239
2240 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2241
2242 do
2243 {
2244#if EV_VERIFY >= 2
2245 ev_loop_verify (EV_A);
2246#endif
2247
2248#ifndef _WIN32
2249 if (expect_false (curpid)) /* penalise the forking check even more */
2250 if (expect_false (getpid () != curpid))
2251 {
2252 curpid = getpid ();
2253 postfork = 1;
2254 }
2255#endif
2256
2257#if EV_FORK_ENABLE
2258 /* we might have forked, so queue fork handlers */
2259 if (expect_false (postfork))
2260 if (forkcnt)
2261 {
2262 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2263 EV_INVOKE_PENDING;
2264 }
2265#endif
2266
2267 /* queue prepare watchers (and execute them) */
2268 if (expect_false (preparecnt))
2269 {
2270 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2271 EV_INVOKE_PENDING;
2272 }
2273
2274 if (expect_false (loop_done))
2275 break;
2276
2277 /* we might have forked, so reify kernel state if necessary */
2278 if (expect_false (postfork))
2279 loop_fork (EV_A);
2280
2281 /* update fd-related kernel structures */
2282 fd_reify (EV_A);
2283
2284 /* calculate blocking time */
2285 {
2286 ev_tstamp waittime = 0.;
2287 ev_tstamp sleeptime = 0.;
2288
2289 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
2290 {
2291 /* remember old timestamp for io_blocktime calculation */
2292 ev_tstamp prev_mn_now = mn_now;
2293
2294 /* update time to cancel out callback processing overhead */
2295 time_update (EV_A_ 1e100);
2296
2297 waittime = MAX_BLOCKTIME;
2298
2299 if (timercnt)
2300 {
2301 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2302 if (waittime > to) waittime = to;
2303 }
2304
2305#if EV_PERIODIC_ENABLE
2306 if (periodiccnt)
2307 {
2308 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2309 if (waittime > to) waittime = to;
2310 }
2311#endif
2312
2313 /* don't let timeouts decrease the waittime below timeout_blocktime */
2314 if (expect_false (waittime < timeout_blocktime))
2315 waittime = timeout_blocktime;
2316
2317 /* extra check because io_blocktime is commonly 0 */
2318 if (expect_false (io_blocktime))
2319 {
2320 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2321
2322 if (sleeptime > waittime - backend_fudge)
2323 sleeptime = waittime - backend_fudge;
2324
2325 if (expect_true (sleeptime > 0.))
2326 {
2327 ev_sleep (sleeptime);
2328 waittime -= sleeptime;
2329 }
2330 }
2331 }
2332
2333#if EV_MINIMAL < 2
2334 ++loop_count;
2335#endif
2336 assert ((loop_done = EVUNLOOP_RECURSE, 1)); /* assert for side effect */
2337 backend_poll (EV_A_ waittime);
2338 assert ((loop_done = EVUNLOOP_CANCEL, 1)); /* assert for side effect */
2339
2340 /* update ev_rt_now, do magic */
2341 time_update (EV_A_ waittime + sleeptime);
2342 }
2343
2344 /* queue pending timers and reschedule them */
2345 timers_reify (EV_A); /* relative timers called last */
2346#if EV_PERIODIC_ENABLE
2347 periodics_reify (EV_A); /* absolute timers called first */
2348#endif
2349
2350#if EV_IDLE_ENABLE
2351 /* queue idle watchers unless other events are pending */
2352 idle_reify (EV_A);
2353#endif
2354
2355 /* queue check watchers, to be executed first */
2356 if (expect_false (checkcnt))
2357 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2358
2359 EV_INVOKE_PENDING;
2360 }
2361 while (expect_true (
2362 activecnt
2363 && !loop_done
2364 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2365 ));
2366
2367 if (loop_done == EVUNLOOP_ONE)
2368 loop_done = EVUNLOOP_CANCEL;
2369
2370#if EV_MINIMAL < 2
2371 --loop_depth;
2372#endif
2373}
2374
2375void
2376ev_unloop (EV_P_ int how)
2377{
2378 loop_done = how;
2379}
2380
2381void
2382ev_ref (EV_P)
2383{
2384 ++activecnt;
2385}
2386
2387void
2388ev_unref (EV_P)
2389{
2390 --activecnt;
2391}
2392
2393void
2394ev_now_update (EV_P)
2395{
2396 time_update (EV_A_ 1e100);
2397}
2398
2399void
2400ev_suspend (EV_P)
2401{
2402 ev_now_update (EV_A);
2403}
2404
2405void
2406ev_resume (EV_P)
2407{
2408 ev_tstamp mn_prev = mn_now;
2409
2410 ev_now_update (EV_A);
2411 timers_reschedule (EV_A_ mn_now - mn_prev);
2412#if EV_PERIODIC_ENABLE
2413 /* TODO: really do this? */
2414 periodics_reschedule (EV_A);
2415#endif
2416}
2417
2418/*****************************************************************************/
2419/* singly-linked list management, used when the expected list length is short */
2420
2421inline_size void
2422wlist_add (WL *head, WL elem)
2423{
2424 elem->next = *head;
2425 *head = elem;
2426}
2427
2428inline_size void
2429wlist_del (WL *head, WL elem)
2430{
2431 while (*head)
2432 {
2433 if (expect_true (*head == elem))
2434 {
2435 *head = elem->next;
2436 break;
2437 }
2438
2439 head = &(*head)->next;
2440 }
2441}
2442
2443/* internal, faster, version of ev_clear_pending */
2444inline_speed void
2445clear_pending (EV_P_ W w)
2446{
2447 if (w->pending)
2448 {
2449 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2450 w->pending = 0;
2451 }
2452}
2453
2454int
2455ev_clear_pending (EV_P_ void *w)
2456{
2457 W w_ = (W)w;
2458 int pending = w_->pending;
2459
2460 if (expect_true (pending))
2461 {
2462 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2463 p->w = (W)&pending_w;
2464 w_->pending = 0;
2465 return p->events;
2466 }
2467 else
2468 return 0;
2469}
2470
2471inline_size void
2472pri_adjust (EV_P_ W w)
2473{
2474 int pri = ev_priority (w);
2475 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2476 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2477 ev_set_priority (w, pri);
2478}
2479
2480inline_speed void
2481ev_start (EV_P_ W w, int active)
2482{
2483 pri_adjust (EV_A_ w);
2484 w->active = active;
2485 ev_ref (EV_A);
2486}
2487
2488inline_size void
2489ev_stop (EV_P_ W w)
2490{
2491 ev_unref (EV_A);
2492 w->active = 0;
2493}
2494
2495/*****************************************************************************/
2496
2497void noinline
2498ev_io_start (EV_P_ ev_io *w)
2499{
2500 int fd = w->fd;
2501
2502 if (expect_false (ev_is_active (w)))
2503 return;
2504
2505 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2506 assert (("libev: ev_io start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2507
2508 EV_FREQUENT_CHECK;
2509
2510 ev_start (EV_A_ (W)w, 1);
2511 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2512 wlist_add (&anfds[fd].head, (WL)w);
2513
2514 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2515 w->events &= ~EV__IOFDSET;
2516
2517 EV_FREQUENT_CHECK;
2518}
2519
2520void noinline
2521ev_io_stop (EV_P_ ev_io *w)
2522{
2523 clear_pending (EV_A_ (W)w);
2524 if (expect_false (!ev_is_active (w)))
2525 return;
2526
2527 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2528
2529 EV_FREQUENT_CHECK;
2530
2531 wlist_del (&anfds[w->fd].head, (WL)w);
2532 ev_stop (EV_A_ (W)w);
2533
2534 fd_change (EV_A_ w->fd, 1);
2535
2536 EV_FREQUENT_CHECK;
2537}
2538
2539void noinline
2540ev_timer_start (EV_P_ ev_timer *w)
2541{
2542 if (expect_false (ev_is_active (w)))
2543 return;
2544
2545 ev_at (w) += mn_now;
2546
2547 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2548
2549 EV_FREQUENT_CHECK;
2550
2551 ++timercnt;
2552 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2553 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2554 ANHE_w (timers [ev_active (w)]) = (WT)w;
2555 ANHE_at_cache (timers [ev_active (w)]);
2556 upheap (timers, ev_active (w));
2557
2558 EV_FREQUENT_CHECK;
2559
2560 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2561}
2562
2563void noinline
2564ev_timer_stop (EV_P_ ev_timer *w)
2565{
2566 clear_pending (EV_A_ (W)w);
2567 if (expect_false (!ev_is_active (w)))
2568 return;
2569
2570 EV_FREQUENT_CHECK;
2571
2572 {
2573 int active = ev_active (w);
2574
2575 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2576
2577 --timercnt;
2578
2579 if (expect_true (active < timercnt + HEAP0))
2580 {
2581 timers [active] = timers [timercnt + HEAP0];
2582 adjustheap (timers, timercnt, active);
2583 }
2584 }
2585
2586 EV_FREQUENT_CHECK;
2587
2588 ev_at (w) -= mn_now;
2589
2590 ev_stop (EV_A_ (W)w);
2591}
2592
2593void noinline
2594ev_timer_again (EV_P_ ev_timer *w)
2595{
2596 EV_FREQUENT_CHECK;
2597
2598 if (ev_is_active (w))
2599 {
418 if (w->repeat) 2600 if (w->repeat)
419 { 2601 {
420 w->at = now + w->repeat; 2602 ev_at (w) = mn_now + w->repeat;
421 assert (("timer timeout in the past, negative repeat?", w->at > now)); 2603 ANHE_at_cache (timers [ev_active (w)]);
422 downheap ((WT *)timers, timercnt, 0); 2604 adjustheap (timers, timercnt, ev_active (w));
423 } 2605 }
424 else 2606 else
425 evtimer_stop (w); /* nonrepeating: stop timer */ 2607 ev_timer_stop (EV_A_ w);
426 }
427}
428
429static void
430periodics_reify ()
431{
432 while (periodiccnt && periodics [0]->at <= ev_now)
433 { 2608 }
434 struct ev_periodic *w = periodics [0]; 2609 else if (w->repeat)
2610 {
2611 ev_at (w) = w->repeat;
2612 ev_timer_start (EV_A_ w);
2613 }
435 2614
436 /* first reschedule or stop timer */ 2615 EV_FREQUENT_CHECK;
2616}
2617
2618ev_tstamp
2619ev_timer_remaining (EV_P_ ev_timer *w)
2620{
2621 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2622}
2623
2624#if EV_PERIODIC_ENABLE
2625void noinline
2626ev_periodic_start (EV_P_ ev_periodic *w)
2627{
2628 if (expect_false (ev_is_active (w)))
2629 return;
2630
2631 if (w->reschedule_cb)
2632 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
437 if (w->interval) 2633 else if (w->interval)
2634 {
2635 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2636 /* this formula differs from the one in periodic_reify because we do not always round up */
2637 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2638 }
2639 else
2640 ev_at (w) = w->offset;
2641
2642 EV_FREQUENT_CHECK;
2643
2644 ++periodiccnt;
2645 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2646 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2647 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2648 ANHE_at_cache (periodics [ev_active (w)]);
2649 upheap (periodics, ev_active (w));
2650
2651 EV_FREQUENT_CHECK;
2652
2653 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2654}
2655
2656void noinline
2657ev_periodic_stop (EV_P_ ev_periodic *w)
2658{
2659 clear_pending (EV_A_ (W)w);
2660 if (expect_false (!ev_is_active (w)))
2661 return;
2662
2663 EV_FREQUENT_CHECK;
2664
2665 {
2666 int active = ev_active (w);
2667
2668 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2669
2670 --periodiccnt;
2671
2672 if (expect_true (active < periodiccnt + HEAP0))
2673 {
2674 periodics [active] = periodics [periodiccnt + HEAP0];
2675 adjustheap (periodics, periodiccnt, active);
2676 }
2677 }
2678
2679 EV_FREQUENT_CHECK;
2680
2681 ev_stop (EV_A_ (W)w);
2682}
2683
2684void noinline
2685ev_periodic_again (EV_P_ ev_periodic *w)
2686{
2687 /* TODO: use adjustheap and recalculation */
2688 ev_periodic_stop (EV_A_ w);
2689 ev_periodic_start (EV_A_ w);
2690}
2691#endif
2692
2693#ifndef SA_RESTART
2694# define SA_RESTART 0
2695#endif
2696
2697void noinline
2698ev_signal_start (EV_P_ ev_signal *w)
2699{
2700 if (expect_false (ev_is_active (w)))
2701 return;
2702
2703 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2704
2705#if EV_MULTIPLICITY
2706 assert (("libev: a signal must not be attached to two different loops",
2707 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2708
2709 signals [w->signum - 1].loop = EV_A;
2710#endif
2711
2712 EV_FREQUENT_CHECK;
2713
2714#if EV_USE_SIGNALFD
2715 if (sigfd == -2)
2716 {
2717 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2718 if (sigfd < 0 && errno == EINVAL)
2719 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2720
2721 if (sigfd >= 0)
438 { 2722 {
439 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 2723 fd_intern (sigfd); /* doing it twice will not hurt */
440 assert (("periodic timeout in the past, negative interval?", w->at > ev_now)); 2724
441 downheap ((WT *)periodics, periodiccnt, 0); 2725 sigemptyset (&sigfd_set);
2726
2727 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2728 ev_set_priority (&sigfd_w, EV_MAXPRI);
2729 ev_io_start (EV_A_ &sigfd_w);
2730 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2731 }
2732 }
2733
2734 if (sigfd >= 0)
2735 {
2736 /* TODO: check .head */
2737 sigaddset (&sigfd_set, w->signum);
2738 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2739
2740 signalfd (sigfd, &sigfd_set, 0);
2741 }
2742#endif
2743
2744 ev_start (EV_A_ (W)w, 1);
2745 wlist_add (&signals [w->signum - 1].head, (WL)w);
2746
2747 if (!((WL)w)->next)
2748# if EV_USE_SIGNALFD
2749 if (sigfd < 0) /*TODO*/
2750# endif
2751 {
2752# if _WIN32
2753 evpipe_init (EV_A);
2754
2755 signal (w->signum, ev_sighandler);
2756# else
2757 struct sigaction sa;
2758
2759 evpipe_init (EV_A);
2760
2761 sa.sa_handler = ev_sighandler;
2762 sigfillset (&sa.sa_mask);
2763 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2764 sigaction (w->signum, &sa, 0);
2765
2766 sigemptyset (&sa.sa_mask);
2767 sigaddset (&sa.sa_mask, w->signum);
2768 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2769#endif
2770 }
2771
2772 EV_FREQUENT_CHECK;
2773}
2774
2775void noinline
2776ev_signal_stop (EV_P_ ev_signal *w)
2777{
2778 clear_pending (EV_A_ (W)w);
2779 if (expect_false (!ev_is_active (w)))
2780 return;
2781
2782 EV_FREQUENT_CHECK;
2783
2784 wlist_del (&signals [w->signum - 1].head, (WL)w);
2785 ev_stop (EV_A_ (W)w);
2786
2787 if (!signals [w->signum - 1].head)
2788 {
2789#if EV_MULTIPLICITY
2790 signals [w->signum - 1].loop = 0; /* unattach from signal */
2791#endif
2792#if EV_USE_SIGNALFD
2793 if (sigfd >= 0)
2794 {
2795 sigset_t ss;
2796
2797 sigemptyset (&ss);
2798 sigaddset (&ss, w->signum);
2799 sigdelset (&sigfd_set, w->signum);
2800
2801 signalfd (sigfd, &sigfd_set, 0);
2802 sigprocmask (SIG_UNBLOCK, &ss, 0);
442 } 2803 }
443 else 2804 else
444 evperiodic_stop (w); /* nonrepeating: stop timer */ 2805#endif
445 2806 signal (w->signum, SIG_DFL);
446 event ((W)w, EV_TIMEOUT);
447 }
448}
449
450static void
451periodics_reschedule (ev_tstamp diff)
452{
453 int i;
454
455 /* adjust periodics after time jump */
456 for (i = 0; i < periodiccnt; ++i)
457 { 2807 }
458 struct ev_periodic *w = periodics [i];
459 2808
460 if (w->interval) 2809 EV_FREQUENT_CHECK;
2810}
2811
2812void
2813ev_child_start (EV_P_ ev_child *w)
2814{
2815#if EV_MULTIPLICITY
2816 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2817#endif
2818 if (expect_false (ev_is_active (w)))
2819 return;
2820
2821 EV_FREQUENT_CHECK;
2822
2823 ev_start (EV_A_ (W)w, 1);
2824 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2825
2826 EV_FREQUENT_CHECK;
2827}
2828
2829void
2830ev_child_stop (EV_P_ ev_child *w)
2831{
2832 clear_pending (EV_A_ (W)w);
2833 if (expect_false (!ev_is_active (w)))
2834 return;
2835
2836 EV_FREQUENT_CHECK;
2837
2838 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2839 ev_stop (EV_A_ (W)w);
2840
2841 EV_FREQUENT_CHECK;
2842}
2843
2844#if EV_STAT_ENABLE
2845
2846# ifdef _WIN32
2847# undef lstat
2848# define lstat(a,b) _stati64 (a,b)
2849# endif
2850
2851#define DEF_STAT_INTERVAL 5.0074891
2852#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2853#define MIN_STAT_INTERVAL 0.1074891
2854
2855static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2856
2857#if EV_USE_INOTIFY
2858# define EV_INOTIFY_BUFSIZE 8192
2859
2860static void noinline
2861infy_add (EV_P_ ev_stat *w)
2862{
2863 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);
2864
2865 if (w->wd >= 0)
2866 {
2867 struct statfs sfs;
2868
2869 /* now local changes will be tracked by inotify, but remote changes won't */
2870 /* unless the filesystem is known to be local, we therefore still poll */
2871 /* also do poll on <2.6.25, but with normal frequency */
2872
2873 if (!fs_2625)
2874 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2875 else if (!statfs (w->path, &sfs)
2876 && (sfs.f_type == 0x1373 /* devfs */
2877 || sfs.f_type == 0xEF53 /* ext2/3 */
2878 || sfs.f_type == 0x3153464a /* jfs */
2879 || sfs.f_type == 0x52654973 /* reiser3 */
2880 || sfs.f_type == 0x01021994 /* tempfs */
2881 || sfs.f_type == 0x58465342 /* xfs */))
2882 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
2883 else
2884 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
2885 }
2886 else
2887 {
2888 /* can't use inotify, continue to stat */
2889 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2890
2891 /* if path is not there, monitor some parent directory for speedup hints */
2892 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2893 /* but an efficiency issue only */
2894 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
461 { 2895 {
462 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 2896 char path [4096];
2897 strcpy (path, w->path);
463 2898
464 if (fabs (diff) >= 1e-4) 2899 do
465 { 2900 {
466 evperiodic_stop (w); 2901 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
467 evperiodic_start (w); 2902 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
468 2903
469 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 2904 char *pend = strrchr (path, '/');
2905
2906 if (!pend || pend == path)
2907 break;
2908
2909 *pend = 0;
2910 w->wd = inotify_add_watch (fs_fd, path, mask);
2911 }
2912 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2913 }
2914 }
2915
2916 if (w->wd >= 0)
2917 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2918
2919 /* now re-arm timer, if required */
2920 if (ev_is_active (&w->timer)) ev_ref (EV_A);
2921 ev_timer_again (EV_A_ &w->timer);
2922 if (ev_is_active (&w->timer)) ev_unref (EV_A);
2923}
2924
2925static void noinline
2926infy_del (EV_P_ ev_stat *w)
2927{
2928 int slot;
2929 int wd = w->wd;
2930
2931 if (wd < 0)
2932 return;
2933
2934 w->wd = -2;
2935 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2936 wlist_del (&fs_hash [slot].head, (WL)w);
2937
2938 /* remove this watcher, if others are watching it, they will rearm */
2939 inotify_rm_watch (fs_fd, wd);
2940}
2941
2942static void noinline
2943infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2944{
2945 if (slot < 0)
2946 /* overflow, need to check for all hash slots */
2947 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2948 infy_wd (EV_A_ slot, wd, ev);
2949 else
2950 {
2951 WL w_;
2952
2953 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2954 {
2955 ev_stat *w = (ev_stat *)w_;
2956 w_ = w_->next; /* lets us remove this watcher and all before it */
2957
2958 if (w->wd == wd || wd == -1)
2959 {
2960 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2961 {
2962 wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2963 w->wd = -1;
2964 infy_add (EV_A_ w); /* re-add, no matter what */
2965 }
2966
2967 stat_timer_cb (EV_A_ &w->timer, 0);
470 } 2968 }
471 } 2969 }
472 } 2970 }
473} 2971}
474 2972
475static void 2973static void
476time_update () 2974infy_cb (EV_P_ ev_io *w, int revents)
477{ 2975{
2976 char buf [EV_INOTIFY_BUFSIZE];
2977 struct inotify_event *ev = (struct inotify_event *)buf;
478 int i; 2978 int ofs;
2979 int len = read (fs_fd, buf, sizeof (buf));
479 2980
480 ev_now = ev_time (); 2981 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2982 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2983}
481 2984
482 if (have_monotonic) 2985inline_size void
2986check_2625 (EV_P)
2987{
2988 /* kernels < 2.6.25 are borked
2989 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
2990 */
2991 struct utsname buf;
2992 int major, minor, micro;
2993
2994 if (uname (&buf))
2995 return;
2996
2997 if (sscanf (buf.release, "%d.%d.%d", &major, &minor, &micro) != 3)
2998 return;
2999
3000 if (major < 2
3001 || (major == 2 && minor < 6)
3002 || (major == 2 && minor == 6 && micro < 25))
3003 return;
3004
3005 fs_2625 = 1;
3006}
3007
3008inline_size int
3009infy_newfd (void)
3010{
3011#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3012 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3013 if (fd >= 0)
3014 return fd;
3015#endif
3016 return inotify_init ();
3017}
3018
3019inline_size void
3020infy_init (EV_P)
3021{
3022 if (fs_fd != -2)
3023 return;
3024
3025 fs_fd = -1;
3026
3027 check_2625 (EV_A);
3028
3029 fs_fd = infy_newfd ();
3030
3031 if (fs_fd >= 0)
3032 {
3033 fd_intern (fs_fd);
3034 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3035 ev_set_priority (&fs_w, EV_MAXPRI);
3036 ev_io_start (EV_A_ &fs_w);
3037 ev_unref (EV_A);
483 { 3038 }
484 ev_tstamp odiff = diff; 3039}
485 3040
486 for (i = 4; --i; ) /* loop a few times, before making important decisions */ 3041inline_size void
3042infy_fork (EV_P)
3043{
3044 int slot;
3045
3046 if (fs_fd < 0)
3047 return;
3048
3049 ev_ref (EV_A);
3050 ev_io_stop (EV_A_ &fs_w);
3051 close (fs_fd);
3052 fs_fd = infy_newfd ();
3053
3054 if (fs_fd >= 0)
3055 {
3056 fd_intern (fs_fd);
3057 ev_io_set (&fs_w, fs_fd, EV_READ);
3058 ev_io_start (EV_A_ &fs_w);
3059 ev_unref (EV_A);
3060 }
3061
3062 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
3063 {
3064 WL w_ = fs_hash [slot].head;
3065 fs_hash [slot].head = 0;
3066
3067 while (w_)
487 { 3068 {
488 now = get_clock (); 3069 ev_stat *w = (ev_stat *)w_;
489 diff = ev_now - now; 3070 w_ = w_->next; /* lets us add this watcher */
490 3071
491 if (fabs (odiff - diff) < MIN_TIMEJUMP) 3072 w->wd = -1;
492 return; /* all is well */
493 3073
494 ev_now = ev_time (); 3074 if (fs_fd >= 0)
3075 infy_add (EV_A_ w); /* re-add, no matter what */
3076 else
3077 {
3078 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3079 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3080 ev_timer_again (EV_A_ &w->timer);
3081 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3082 }
495 } 3083 }
496
497 periodics_reschedule (diff - odiff);
498 /* no timer adjustment, as the monotonic clock doesn't jump */
499 } 3084 }
3085}
3086
3087#endif
3088
3089#ifdef _WIN32
3090# define EV_LSTAT(p,b) _stati64 (p, b)
3091#else
3092# define EV_LSTAT(p,b) lstat (p, b)
3093#endif
3094
3095void
3096ev_stat_stat (EV_P_ ev_stat *w)
3097{
3098 if (lstat (w->path, &w->attr) < 0)
3099 w->attr.st_nlink = 0;
3100 else if (!w->attr.st_nlink)
3101 w->attr.st_nlink = 1;
3102}
3103
3104static void noinline
3105stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3106{
3107 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3108
3109 ev_statdata prev = w->attr;
3110 ev_stat_stat (EV_A_ w);
3111
3112 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3113 if (
3114 prev.st_dev != w->attr.st_dev
3115 || prev.st_ino != w->attr.st_ino
3116 || prev.st_mode != w->attr.st_mode
3117 || prev.st_nlink != w->attr.st_nlink
3118 || prev.st_uid != w->attr.st_uid
3119 || prev.st_gid != w->attr.st_gid
3120 || prev.st_rdev != w->attr.st_rdev
3121 || prev.st_size != w->attr.st_size
3122 || prev.st_atime != w->attr.st_atime
3123 || prev.st_mtime != w->attr.st_mtime
3124 || prev.st_ctime != w->attr.st_ctime
3125 ) {
3126 /* we only update w->prev on actual differences */
3127 /* in case we test more often than invoke the callback, */
3128 /* to ensure that prev is always different to attr */
3129 w->prev = prev;
3130
3131 #if EV_USE_INOTIFY
3132 if (fs_fd >= 0)
3133 {
3134 infy_del (EV_A_ w);
3135 infy_add (EV_A_ w);
3136 ev_stat_stat (EV_A_ w); /* avoid race... */
3137 }
3138 #endif
3139
3140 ev_feed_event (EV_A_ w, EV_STAT);
3141 }
3142}
3143
3144void
3145ev_stat_start (EV_P_ ev_stat *w)
3146{
3147 if (expect_false (ev_is_active (w)))
3148 return;
3149
3150 ev_stat_stat (EV_A_ w);
3151
3152 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3153 w->interval = MIN_STAT_INTERVAL;
3154
3155 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3156 ev_set_priority (&w->timer, ev_priority (w));
3157
3158#if EV_USE_INOTIFY
3159 infy_init (EV_A);
3160
3161 if (fs_fd >= 0)
3162 infy_add (EV_A_ w);
500 else 3163 else
3164#endif
3165 {
3166 ev_timer_again (EV_A_ &w->timer);
3167 ev_unref (EV_A);
501 { 3168 }
502 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) 3169
3170 ev_start (EV_A_ (W)w, 1);
3171
3172 EV_FREQUENT_CHECK;
3173}
3174
3175void
3176ev_stat_stop (EV_P_ ev_stat *w)
3177{
3178 clear_pending (EV_A_ (W)w);
3179 if (expect_false (!ev_is_active (w)))
3180 return;
3181
3182 EV_FREQUENT_CHECK;
3183
3184#if EV_USE_INOTIFY
3185 infy_del (EV_A_ w);
3186#endif
3187
3188 if (ev_is_active (&w->timer))
3189 {
3190 ev_ref (EV_A);
3191 ev_timer_stop (EV_A_ &w->timer);
3192 }
3193
3194 ev_stop (EV_A_ (W)w);
3195
3196 EV_FREQUENT_CHECK;
3197}
3198#endif
3199
3200#if EV_IDLE_ENABLE
3201void
3202ev_idle_start (EV_P_ ev_idle *w)
3203{
3204 if (expect_false (ev_is_active (w)))
3205 return;
3206
3207 pri_adjust (EV_A_ (W)w);
3208
3209 EV_FREQUENT_CHECK;
3210
3211 {
3212 int active = ++idlecnt [ABSPRI (w)];
3213
3214 ++idleall;
3215 ev_start (EV_A_ (W)w, active);
3216
3217 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3218 idles [ABSPRI (w)][active - 1] = w;
3219 }
3220
3221 EV_FREQUENT_CHECK;
3222}
3223
3224void
3225ev_idle_stop (EV_P_ ev_idle *w)
3226{
3227 clear_pending (EV_A_ (W)w);
3228 if (expect_false (!ev_is_active (w)))
3229 return;
3230
3231 EV_FREQUENT_CHECK;
3232
3233 {
3234 int active = ev_active (w);
3235
3236 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3237 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3238
3239 ev_stop (EV_A_ (W)w);
3240 --idleall;
3241 }
3242
3243 EV_FREQUENT_CHECK;
3244}
3245#endif
3246
3247void
3248ev_prepare_start (EV_P_ ev_prepare *w)
3249{
3250 if (expect_false (ev_is_active (w)))
3251 return;
3252
3253 EV_FREQUENT_CHECK;
3254
3255 ev_start (EV_A_ (W)w, ++preparecnt);
3256 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3257 prepares [preparecnt - 1] = w;
3258
3259 EV_FREQUENT_CHECK;
3260}
3261
3262void
3263ev_prepare_stop (EV_P_ ev_prepare *w)
3264{
3265 clear_pending (EV_A_ (W)w);
3266 if (expect_false (!ev_is_active (w)))
3267 return;
3268
3269 EV_FREQUENT_CHECK;
3270
3271 {
3272 int active = ev_active (w);
3273
3274 prepares [active - 1] = prepares [--preparecnt];
3275 ev_active (prepares [active - 1]) = active;
3276 }
3277
3278 ev_stop (EV_A_ (W)w);
3279
3280 EV_FREQUENT_CHECK;
3281}
3282
3283void
3284ev_check_start (EV_P_ ev_check *w)
3285{
3286 if (expect_false (ev_is_active (w)))
3287 return;
3288
3289 EV_FREQUENT_CHECK;
3290
3291 ev_start (EV_A_ (W)w, ++checkcnt);
3292 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3293 checks [checkcnt - 1] = w;
3294
3295 EV_FREQUENT_CHECK;
3296}
3297
3298void
3299ev_check_stop (EV_P_ ev_check *w)
3300{
3301 clear_pending (EV_A_ (W)w);
3302 if (expect_false (!ev_is_active (w)))
3303 return;
3304
3305 EV_FREQUENT_CHECK;
3306
3307 {
3308 int active = ev_active (w);
3309
3310 checks [active - 1] = checks [--checkcnt];
3311 ev_active (checks [active - 1]) = active;
3312 }
3313
3314 ev_stop (EV_A_ (W)w);
3315
3316 EV_FREQUENT_CHECK;
3317}
3318
3319#if EV_EMBED_ENABLE
3320void noinline
3321ev_embed_sweep (EV_P_ ev_embed *w)
3322{
3323 ev_loop (w->other, EVLOOP_NONBLOCK);
3324}
3325
3326static void
3327embed_io_cb (EV_P_ ev_io *io, int revents)
3328{
3329 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3330
3331 if (ev_cb (w))
3332 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3333 else
3334 ev_loop (w->other, EVLOOP_NONBLOCK);
3335}
3336
3337static void
3338embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3339{
3340 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3341
3342 {
3343 EV_P = w->other;
3344
3345 while (fdchangecnt)
503 { 3346 {
504 periodics_reschedule (ev_now - now); 3347 fd_reify (EV_A);
505 3348 ev_loop (EV_A_ EVLOOP_NONBLOCK);
506 /* adjust timers. this is easy, as the offset is the same for all */
507 for (i = 0; i < timercnt; ++i)
508 timers [i]->at += diff;
509 } 3349 }
510
511 now = ev_now;
512 } 3350 }
513} 3351}
514 3352
515int ev_loop_done; 3353static void
516 3354embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
517void ev_loop (int flags)
518{ 3355{
519 double block; 3356 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
520 ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;
521 3357
522 if (checkcnt) 3358 ev_embed_stop (EV_A_ w);
3359
523 { 3360 {
524 queue_events ((W *)checks, checkcnt, EV_CHECK); 3361 EV_P = w->other;
525 call_pending (); 3362
3363 ev_loop_fork (EV_A);
3364 ev_loop (EV_A_ EVLOOP_NONBLOCK);
526 } 3365 }
527 3366
528 do 3367 ev_embed_start (EV_A_ w);
3368}
3369
3370#if 0
3371static void
3372embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3373{
3374 ev_idle_stop (EV_A_ idle);
3375}
3376#endif
3377
3378void
3379ev_embed_start (EV_P_ ev_embed *w)
3380{
3381 if (expect_false (ev_is_active (w)))
3382 return;
3383
529 { 3384 {
530 /* update fd-related kernel structures */ 3385 EV_P = w->other;
531 fd_reify (); 3386 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
532 3387 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
533 /* calculate blocking time */
534
535 /* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */
536 ev_now = ev_time ();
537
538 if (flags & EVLOOP_NONBLOCK || idlecnt)
539 block = 0.;
540 else
541 {
542 block = MAX_BLOCKTIME;
543
544 if (timercnt)
545 {
546 ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
547 if (block > to) block = to;
548 }
549
550 if (periodiccnt)
551 {
552 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
553 if (block > to) block = to;
554 }
555
556 if (block < 0.) block = 0.;
557 }
558
559 method_poll (block);
560
561 /* update ev_now, do magic */
562 time_update ();
563
564 /* queue pending timers and reschedule them */
565 periodics_reify (); /* absolute timers first */
566 timers_reify (); /* relative timers second */
567
568 /* queue idle watchers unless io or timers are pending */
569 if (!pendingcnt)
570 queue_events ((W *)idles, idlecnt, EV_IDLE);
571
572 /* queue check and possibly idle watchers */
573 queue_events ((W *)checks, checkcnt, EV_CHECK);
574
575 call_pending ();
576 } 3388 }
577 while (!ev_loop_done);
578 3389
579 if (ev_loop_done != 2) 3390 EV_FREQUENT_CHECK;
580 ev_loop_done = 0; 3391
3392 ev_set_priority (&w->io, ev_priority (w));
3393 ev_io_start (EV_A_ &w->io);
3394
3395 ev_prepare_init (&w->prepare, embed_prepare_cb);
3396 ev_set_priority (&w->prepare, EV_MINPRI);
3397 ev_prepare_start (EV_A_ &w->prepare);
3398
3399 ev_fork_init (&w->fork, embed_fork_cb);
3400 ev_fork_start (EV_A_ &w->fork);
3401
3402 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3403
3404 ev_start (EV_A_ (W)w, 1);
3405
3406 EV_FREQUENT_CHECK;
581} 3407}
3408
3409void
3410ev_embed_stop (EV_P_ ev_embed *w)
3411{
3412 clear_pending (EV_A_ (W)w);
3413 if (expect_false (!ev_is_active (w)))
3414 return;
3415
3416 EV_FREQUENT_CHECK;
3417
3418 ev_io_stop (EV_A_ &w->io);
3419 ev_prepare_stop (EV_A_ &w->prepare);
3420 ev_fork_stop (EV_A_ &w->fork);
3421
3422 EV_FREQUENT_CHECK;
3423}
3424#endif
3425
3426#if EV_FORK_ENABLE
3427void
3428ev_fork_start (EV_P_ ev_fork *w)
3429{
3430 if (expect_false (ev_is_active (w)))
3431 return;
3432
3433 EV_FREQUENT_CHECK;
3434
3435 ev_start (EV_A_ (W)w, ++forkcnt);
3436 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3437 forks [forkcnt - 1] = w;
3438
3439 EV_FREQUENT_CHECK;
3440}
3441
3442void
3443ev_fork_stop (EV_P_ ev_fork *w)
3444{
3445 clear_pending (EV_A_ (W)w);
3446 if (expect_false (!ev_is_active (w)))
3447 return;
3448
3449 EV_FREQUENT_CHECK;
3450
3451 {
3452 int active = ev_active (w);
3453
3454 forks [active - 1] = forks [--forkcnt];
3455 ev_active (forks [active - 1]) = active;
3456 }
3457
3458 ev_stop (EV_A_ (W)w);
3459
3460 EV_FREQUENT_CHECK;
3461}
3462#endif
3463
3464#if EV_ASYNC_ENABLE
3465void
3466ev_async_start (EV_P_ ev_async *w)
3467{
3468 if (expect_false (ev_is_active (w)))
3469 return;
3470
3471 evpipe_init (EV_A);
3472
3473 EV_FREQUENT_CHECK;
3474
3475 ev_start (EV_A_ (W)w, ++asynccnt);
3476 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3477 asyncs [asynccnt - 1] = w;
3478
3479 EV_FREQUENT_CHECK;
3480}
3481
3482void
3483ev_async_stop (EV_P_ ev_async *w)
3484{
3485 clear_pending (EV_A_ (W)w);
3486 if (expect_false (!ev_is_active (w)))
3487 return;
3488
3489 EV_FREQUENT_CHECK;
3490
3491 {
3492 int active = ev_active (w);
3493
3494 asyncs [active - 1] = asyncs [--asynccnt];
3495 ev_active (asyncs [active - 1]) = active;
3496 }
3497
3498 ev_stop (EV_A_ (W)w);
3499
3500 EV_FREQUENT_CHECK;
3501}
3502
3503void
3504ev_async_send (EV_P_ ev_async *w)
3505{
3506 w->sent = 1;
3507 evpipe_write (EV_A_ &async_pending);
3508}
3509#endif
582 3510
583/*****************************************************************************/ 3511/*****************************************************************************/
584 3512
585static void
586wlist_add (WL *head, WL elem)
587{
588 elem->next = *head;
589 *head = elem;
590}
591
592static void
593wlist_del (WL *head, WL elem)
594{
595 while (*head)
596 {
597 if (*head == elem)
598 {
599 *head = elem->next;
600 return;
601 }
602
603 head = &(*head)->next;
604 }
605}
606
607static void
608ev_clear (W w)
609{
610 if (w->pending)
611 {
612 pendings [w->pending - 1].w = 0;
613 w->pending = 0;
614 }
615}
616
617static void
618ev_start (W w, int active)
619{
620 w->active = active;
621}
622
623static void
624ev_stop (W w)
625{
626 w->active = 0;
627}
628
629/*****************************************************************************/
630
631void
632evio_start (struct ev_io *w)
633{
634 if (ev_is_active (w))
635 return;
636
637 int fd = w->fd;
638
639 ev_start ((W)w, 1);
640 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
641 wlist_add ((WL *)&anfds[fd].head, (WL)w);
642
643 ++fdchangecnt;
644 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
645 fdchanges [fdchangecnt - 1] = fd;
646}
647
648void
649evio_stop (struct ev_io *w)
650{
651 ev_clear ((W)w);
652 if (!ev_is_active (w))
653 return;
654
655 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
656 ev_stop ((W)w);
657
658 ++fdchangecnt;
659 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
660 fdchanges [fdchangecnt - 1] = w->fd;
661}
662
663void
664evtimer_start (struct ev_timer *w)
665{
666 if (ev_is_active (w))
667 return;
668
669 w->at += now;
670
671 assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
672
673 ev_start ((W)w, ++timercnt);
674 array_needsize (timers, timermax, timercnt, );
675 timers [timercnt - 1] = w;
676 upheap ((WT *)timers, timercnt - 1);
677}
678
679void
680evtimer_stop (struct ev_timer *w)
681{
682 ev_clear ((W)w);
683 if (!ev_is_active (w))
684 return;
685
686 if (w->active < timercnt--)
687 {
688 timers [w->active - 1] = timers [timercnt];
689 downheap ((WT *)timers, timercnt, w->active - 1);
690 }
691
692 w->at = w->repeat;
693
694 ev_stop ((W)w);
695}
696
697void
698evtimer_again (struct ev_timer *w)
699{
700 if (ev_is_active (w))
701 {
702 if (w->repeat)
703 {
704 w->at = now + w->repeat;
705 downheap ((WT *)timers, timercnt, w->active - 1);
706 }
707 else
708 evtimer_stop (w);
709 }
710 else if (w->repeat)
711 evtimer_start (w);
712}
713
714void
715evperiodic_start (struct ev_periodic *w)
716{
717 if (ev_is_active (w))
718 return;
719
720 assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
721
722 /* this formula differs from the one in periodic_reify because we do not always round up */
723 if (w->interval)
724 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
725
726 ev_start ((W)w, ++periodiccnt);
727 array_needsize (periodics, periodicmax, periodiccnt, );
728 periodics [periodiccnt - 1] = w;
729 upheap ((WT *)periodics, periodiccnt - 1);
730}
731
732void
733evperiodic_stop (struct ev_periodic *w)
734{
735 ev_clear ((W)w);
736 if (!ev_is_active (w))
737 return;
738
739 if (w->active < periodiccnt--)
740 {
741 periodics [w->active - 1] = periodics [periodiccnt];
742 downheap ((WT *)periodics, periodiccnt, w->active - 1);
743 }
744
745 ev_stop ((W)w);
746}
747
748void
749evsignal_start (struct ev_signal *w)
750{
751 if (ev_is_active (w))
752 return;
753
754 ev_start ((W)w, 1);
755 array_needsize (signals, signalmax, w->signum, signals_init);
756 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
757
758 if (!w->next)
759 {
760 struct sigaction sa;
761 sa.sa_handler = sighandler;
762 sigfillset (&sa.sa_mask);
763 sa.sa_flags = 0;
764 sigaction (w->signum, &sa, 0);
765 }
766}
767
768void
769evsignal_stop (struct ev_signal *w)
770{
771 ev_clear ((W)w);
772 if (!ev_is_active (w))
773 return;
774
775 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
776 ev_stop ((W)w);
777
778 if (!signals [w->signum - 1].head)
779 signal (w->signum, SIG_DFL);
780}
781
782void evidle_start (struct ev_idle *w)
783{
784 if (ev_is_active (w))
785 return;
786
787 ev_start ((W)w, ++idlecnt);
788 array_needsize (idles, idlemax, idlecnt, );
789 idles [idlecnt - 1] = w;
790}
791
792void evidle_stop (struct ev_idle *w)
793{
794 ev_clear ((W)w);
795 if (ev_is_active (w))
796 return;
797
798 idles [w->active - 1] = idles [--idlecnt];
799 ev_stop ((W)w);
800}
801
802void evcheck_start (struct ev_check *w)
803{
804 if (ev_is_active (w))
805 return;
806
807 ev_start ((W)w, ++checkcnt);
808 array_needsize (checks, checkmax, checkcnt, );
809 checks [checkcnt - 1] = w;
810}
811
812void evcheck_stop (struct ev_check *w)
813{
814 ev_clear ((W)w);
815 if (ev_is_active (w))
816 return;
817
818 checks [w->active - 1] = checks [--checkcnt];
819 ev_stop ((W)w);
820}
821
822/*****************************************************************************/
823
824struct ev_once 3513struct ev_once
825{ 3514{
826 struct ev_io io; 3515 ev_io io;
827 struct ev_timer to; 3516 ev_timer to;
828 void (*cb)(int revents, void *arg); 3517 void (*cb)(int revents, void *arg);
829 void *arg; 3518 void *arg;
830}; 3519};
831 3520
832static void 3521static void
833once_cb (struct ev_once *once, int revents) 3522once_cb (EV_P_ struct ev_once *once, int revents)
834{ 3523{
835 void (*cb)(int revents, void *arg) = once->cb; 3524 void (*cb)(int revents, void *arg) = once->cb;
836 void *arg = once->arg; 3525 void *arg = once->arg;
837 3526
838 evio_stop (&once->io); 3527 ev_io_stop (EV_A_ &once->io);
839 evtimer_stop (&once->to); 3528 ev_timer_stop (EV_A_ &once->to);
840 free (once); 3529 ev_free (once);
841 3530
842 cb (revents, arg); 3531 cb (revents, arg);
843} 3532}
844 3533
845static void 3534static void
846once_cb_io (struct ev_io *w, int revents) 3535once_cb_io (EV_P_ ev_io *w, int revents)
847{ 3536{
848 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents); 3537 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3538
3539 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
849} 3540}
850 3541
851static void 3542static void
852once_cb_to (struct ev_timer *w, int revents) 3543once_cb_to (EV_P_ ev_timer *w, int revents)
853{ 3544{
854 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents); 3545 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
855}
856 3546
3547 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3548}
3549
857void 3550void
858ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) 3551ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
859{ 3552{
860 struct ev_once *once = malloc (sizeof (struct ev_once)); 3553 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
861 3554
862 if (!once) 3555 if (expect_false (!once))
863 cb (EV_ERROR, arg); 3556 {
864 else 3557 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3558 return;
865 { 3559 }
3560
866 once->cb = cb; 3561 once->cb = cb;
867 once->arg = arg; 3562 once->arg = arg;
868 3563
869 evw_init (&once->io, once_cb_io); 3564 ev_init (&once->io, once_cb_io);
870
871 if (fd >= 0) 3565 if (fd >= 0)
3566 {
3567 ev_io_set (&once->io, fd, events);
3568 ev_io_start (EV_A_ &once->io);
3569 }
3570
3571 ev_init (&once->to, once_cb_to);
3572 if (timeout >= 0.)
3573 {
3574 ev_timer_set (&once->to, timeout, 0.);
3575 ev_timer_start (EV_A_ &once->to);
3576 }
3577}
3578
3579/*****************************************************************************/
3580
3581#if EV_WALK_ENABLE
3582void
3583ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3584{
3585 int i, j;
3586 ev_watcher_list *wl, *wn;
3587
3588 if (types & (EV_IO | EV_EMBED))
3589 for (i = 0; i < anfdmax; ++i)
3590 for (wl = anfds [i].head; wl; )
872 { 3591 {
873 evio_set (&once->io, fd, events); 3592 wn = wl->next;
874 evio_start (&once->io); 3593
3594#if EV_EMBED_ENABLE
3595 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3596 {
3597 if (types & EV_EMBED)
3598 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3599 }
3600 else
3601#endif
3602#if EV_USE_INOTIFY
3603 if (ev_cb ((ev_io *)wl) == infy_cb)
3604 ;
3605 else
3606#endif
3607 if ((ev_io *)wl != &pipe_w)
3608 if (types & EV_IO)
3609 cb (EV_A_ EV_IO, wl);
3610
3611 wl = wn;
875 } 3612 }
876 3613
877 evw_init (&once->to, once_cb_to); 3614 if (types & (EV_TIMER | EV_STAT))
878 3615 for (i = timercnt + HEAP0; i-- > HEAP0; )
879 if (timeout >= 0.) 3616#if EV_STAT_ENABLE
3617 /*TODO: timer is not always active*/
3618 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
880 { 3619 {
881 evtimer_set (&once->to, timeout, 0.); 3620 if (types & EV_STAT)
882 evtimer_start (&once->to); 3621 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
883 } 3622 }
884 } 3623 else
885} 3624#endif
3625 if (types & EV_TIMER)
3626 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
886 3627
887/*****************************************************************************/ 3628#if EV_PERIODIC_ENABLE
3629 if (types & EV_PERIODIC)
3630 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3631 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3632#endif
888 3633
889#if 0 3634#if EV_IDLE_ENABLE
3635 if (types & EV_IDLE)
3636 for (j = NUMPRI; i--; )
3637 for (i = idlecnt [j]; i--; )
3638 cb (EV_A_ EV_IDLE, idles [j][i]);
3639#endif
890 3640
891struct ev_io wio; 3641#if EV_FORK_ENABLE
3642 if (types & EV_FORK)
3643 for (i = forkcnt; i--; )
3644 if (ev_cb (forks [i]) != embed_fork_cb)
3645 cb (EV_A_ EV_FORK, forks [i]);
3646#endif
892 3647
893static void 3648#if EV_ASYNC_ENABLE
894sin_cb (struct ev_io *w, int revents) 3649 if (types & EV_ASYNC)
895{ 3650 for (i = asynccnt; i--; )
896 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); 3651 cb (EV_A_ EV_ASYNC, asyncs [i]);
897} 3652#endif
898 3653
899static void 3654 if (types & EV_PREPARE)
900ocb (struct ev_timer *w, int revents) 3655 for (i = preparecnt; i--; )
901{ 3656#if EV_EMBED_ENABLE
902 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); 3657 if (ev_cb (prepares [i]) != embed_prepare_cb)
903 evtimer_stop (w); 3658#endif
904 evtimer_start (w); 3659 cb (EV_A_ EV_PREPARE, prepares [i]);
905}
906 3660
907static void 3661 if (types & EV_CHECK)
908scb (struct ev_signal *w, int revents) 3662 for (i = checkcnt; i--; )
909{ 3663 cb (EV_A_ EV_CHECK, checks [i]);
910 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
911 evio_stop (&wio);
912 evio_start (&wio);
913}
914 3664
915static void 3665 if (types & EV_SIGNAL)
916gcb (struct ev_signal *w, int revents)
917{
918 fprintf (stderr, "generic %x\n", revents);
919
920}
921
922int main (void)
923{
924 ev_init (0);
925
926 evio_init (&wio, sin_cb, 0, EV_READ);
927 evio_start (&wio);
928
929 struct ev_timer t[10000];
930
931#if 0
932 int i;
933 for (i = 0; i < 10000; ++i) 3666 for (i = 0; i < EV_NSIG - 1; ++i)
934 { 3667 for (wl = signals [i].head; wl; )
935 struct ev_timer *w = t + i; 3668 {
936 evw_init (w, ocb, i); 3669 wn = wl->next;
937 evtimer_init_abs (w, ocb, drand48 (), 0.99775533); 3670 cb (EV_A_ EV_SIGNAL, wl);
938 evtimer_start (w); 3671 wl = wn;
939 if (drand48 () < 0.5) 3672 }
940 evtimer_stop (w);
941 }
942#endif
943 3673
944 struct ev_timer t1; 3674 if (types & EV_CHILD)
945 evtimer_init (&t1, ocb, 5, 10); 3675 for (i = EV_PID_HASHSIZE; i--; )
946 evtimer_start (&t1); 3676 for (wl = childs [i]; wl; )
947 3677 {
948 struct ev_signal sig; 3678 wn = wl->next;
949 evsignal_init (&sig, scb, SIGQUIT); 3679 cb (EV_A_ EV_CHILD, wl);
950 evsignal_start (&sig); 3680 wl = wn;
951 3681 }
952 struct ev_check cw; 3682/* EV_STAT 0x00001000 /* stat data changed */
953 evcheck_init (&cw, gcb); 3683/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
954 evcheck_start (&cw);
955
956 struct ev_idle iw;
957 evidle_init (&iw, gcb);
958 evidle_start (&iw);
959
960 ev_loop (0);
961
962 return 0;
963} 3684}
964
965#endif 3685#endif
966 3686
3687#if EV_MULTIPLICITY
3688 #include "ev_wrap.h"
3689#endif
967 3690
3691#ifdef __cplusplus
3692}
3693#endif
968 3694
969

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