ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev.c
(Generate patch)

Comparing libev/ev.c (file contents):
Revision 1.11 by root, Wed Oct 31 07:40:49 2007 UTC vs.
Revision 1.319 by root, Wed Nov 18 10:25:22 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> 160#include <stddef.h>
6 161
7#include <stdio.h> 162#include <stdio.h>
8 163
9#include <assert.h> 164#include <assert.h>
10#include <errno.h> 165#include <errno.h>
11#include <sys/time.h> 166#include <sys/types.h>
12#include <time.h> 167#include <time.h>
13 168
169#include <signal.h>
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
14#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
15# ifdef CLOCK_MONOTONIC 349#ifndef CLOCK_MONOTONIC
350# undef EV_USE_MONOTONIC
16# 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
17# endif 396# endif
18#endif 397# endif
19 398# ifdef __cplusplus
20#ifndef HAVE_SELECT 399extern "C" {
21# define HAVE_SELECT 1
22#endif 400# endif
23 401int eventfd (unsigned int initval, int flags);
24#ifndef HAVE_EPOLL 402# ifdef __cplusplus
25# define HAVE_EPOLL 0 403}
26#endif 404# endif
405#endif
27 406
28#ifndef HAVE_REALTIME 407#if EV_USE_SIGNALFD
29# 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
30#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 */
31 453
32#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) */
33#define MAX_BLOCKTIME 60. 455#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
34 456
35#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
36 467
37struct ev_watcher { 468#define expect_false(expr) expect ((expr) != 0, 0)
38 EV_WATCHER (ev_watcher); 469#define expect_true(expr) expect ((expr) != 0, 1)
39}; 470#define inline_size static inline
40 471
41struct ev_watcher_list { 472#if EV_MINIMAL
42 EV_WATCHER_LIST (ev_watcher_list); 473# define inline_speed static noinline
43}; 474#else
475# define inline_speed static inline
476#endif
44 477
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
45typedef struct ev_watcher *W; 489typedef ev_watcher *W;
46typedef struct ev_watcher_list *WL; 490typedef ev_watcher_list *WL;
491typedef ev_watcher_time *WT;
47 492
48static ev_tstamp now, diff; /* monotonic clock */ 493#define ev_active(w) ((W)(w))->active
49ev_tstamp ev_now; 494#define ev_at(w) ((WT)(w))->at
50int ev_method;
51 495
52static 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
53 501
54static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 502#if EV_USE_MONOTONIC
55static void (*method_modify)(int fd, int oev, int nev); 503static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
56static 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
57 519
58/*****************************************************************************/ 520/*****************************************************************************/
59 521
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
60ev_tstamp 682ev_tstamp
61ev_time (void) 683ev_time (void)
62{ 684{
63#if HAVE_REALTIME 685#if EV_USE_REALTIME
686 if (expect_true (have_realtime))
687 {
64 struct timespec ts; 688 struct timespec ts;
65 clock_gettime (CLOCK_REALTIME, &ts); 689 clock_gettime (CLOCK_REALTIME, &ts);
66 return ts.tv_sec + ts.tv_nsec * 1e-9; 690 return ts.tv_sec + ts.tv_nsec * 1e-9;
67#else 691 }
692#endif
693
68 struct timeval tv; 694 struct timeval tv;
69 gettimeofday (&tv, 0); 695 gettimeofday (&tv, 0);
70 return tv.tv_sec + tv.tv_usec * 1e-6; 696 return tv.tv_sec + tv.tv_usec * 1e-6;
71#endif
72} 697}
698#endif
73 699
74static ev_tstamp 700inline_size ev_tstamp
75get_clock (void) 701get_clock (void)
76{ 702{
77#if HAVE_MONOTONIC 703#if EV_USE_MONOTONIC
78 if (have_monotonic) 704 if (expect_true (have_monotonic))
79 { 705 {
80 struct timespec ts; 706 struct timespec ts;
81 clock_gettime (CLOCK_MONOTONIC, &ts); 707 clock_gettime (CLOCK_MONOTONIC, &ts);
82 return ts.tv_sec + ts.tv_nsec * 1e-9; 708 return ts.tv_sec + ts.tv_nsec * 1e-9;
83 } 709 }
84#endif 710#endif
85 711
86 return ev_time (); 712 return ev_time ();
87} 713}
88 714
89#define array_needsize(base,cur,cnt,init) \ 715#if EV_MULTIPLICITY
90 if ((cnt) > cur) \ 716ev_tstamp
91 { \ 717ev_now (EV_P)
92 int newcnt = cur ? cur << 1 : 16; \ 718{
93 fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ 719 return ev_rt_now;
94 base = realloc (base, sizeof (*base) * (newcnt)); \ 720}
95 init (base + cur, newcnt - cur); \ 721#endif
96 cur = newcnt; \ 722
723void
724ev_sleep (ev_tstamp delay)
725{
726 if (delay > 0.)
97 } 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}
98 750
99/*****************************************************************************/ 751/*****************************************************************************/
100 752
101typedef struct 753#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
102{
103 struct ev_io *head;
104 unsigned char wev, rev; /* want, received event set */
105} ANFD;
106 754
107static ANFD *anfds; 755/* find a suitable new size for the given array, */
108static int anfdmax; 756/* hopefully by rounding to a ncie-to-malloc size */
109 757inline_size int
110static int *fdchanges; 758array_nextsize (int elem, int cur, int cnt)
111static int fdchangemax, fdchangecnt;
112
113static void
114anfds_init (ANFD *base, int count)
115{ 759{
116 while (count--) 760 int ncur = cur + 1;
117 { 761
118 base->head = 0; 762 do
119 base->wev = base->rev = EV_NONE; 763 ncur <<= 1;
120 ++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)
121 } 768 {
122} 769 ncur *= elem;
770 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
771 ncur = ncur - sizeof (void *) * 4;
772 ncur /= elem;
773 }
123 774
124typedef struct 775 return ncur;
125{ 776}
126 W w;
127 int events;
128} ANPENDING;
129 777
130static ANPENDING *pendings; 778static noinline void *
131static int pendingmax, pendingcnt; 779array_realloc (int elem, void *base, int *cur, int cnt)
132
133static void
134event (W w, int events)
135{ 780{
136 w->pending = ++pendingcnt; 781 *cur = array_nextsize (elem, *cur, cnt);
137 array_needsize (pendings, pendingmax, pendingcnt, ); 782 return ev_realloc (base, elem * *cur);
138 pendings [pendingcnt - 1].w = w; 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))
139 pendings [pendingcnt - 1].events = events; 825 pendings [pri][w_->pending - 1].events |= revents;
826 else
827 {
828 w_->pending = ++pendingcnt [pri];
829 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
830 pendings [pri][w_->pending - 1].w = w_;
831 pendings [pri][w_->pending - 1].events = revents;
832 }
140} 833}
141 834
142static 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
143fd_event (int fd, int events) 862fd_event_nc (EV_P_ int fd, int revents)
144{ 863{
145 ANFD *anfd = anfds + fd; 864 ANFD *anfd = anfds + fd;
146 struct ev_io *w; 865 ev_io *w;
147 866
148 for (w = anfd->head; w; w = w->next) 867 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
149 { 868 {
150 int ev = w->events & events; 869 int ev = w->events & revents;
151 870
152 if (ev) 871 if (ev)
153 event ((W)w, ev); 872 ev_feed_event (EV_A_ (W)w, ev);
154 }
155}
156
157static void
158queue_events (W *events, int eventcnt, int type)
159{
160 int i;
161
162 for (i = 0; i < eventcnt; ++i)
163 event (events [i], type);
164}
165
166/*****************************************************************************/
167
168static struct ev_timer **atimers;
169static int atimermax, atimercnt;
170
171static struct ev_timer **rtimers;
172static int rtimermax, rtimercnt;
173
174static void
175upheap (struct ev_timer **timers, int k)
176{
177 struct ev_timer *w = timers [k];
178
179 while (k && timers [k >> 1]->at > w->at)
180 {
181 timers [k] = timers [k >> 1];
182 timers [k]->active = k + 1;
183 k >>= 1;
184 }
185
186 timers [k] = w;
187 timers [k]->active = k + 1;
188
189}
190
191static void
192downheap (struct ev_timer **timers, int N, int k)
193{
194 struct ev_timer *w = timers [k];
195
196 while (k < (N >> 1))
197 {
198 int j = k << 1;
199
200 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
201 ++j;
202
203 if (w->at <= timers [j]->at)
204 break;
205
206 timers [k] = timers [j];
207 timers [k]->active = k + 1;
208 k = j;
209 }
210
211 timers [k] = w;
212 timers [k]->active = k + 1;
213}
214
215/*****************************************************************************/
216
217typedef struct
218{
219 struct ev_signal *head;
220 sig_atomic_t gotsig;
221} ANSIG;
222
223static ANSIG *signals;
224static int signalmax;
225
226static int sigpipe [2];
227static sig_atomic_t gotsig;
228static struct ev_io sigev;
229
230static void
231signals_init (ANSIG *base, int count)
232{
233 while (count--)
234 {
235 base->head = 0;
236 base->gotsig = 0;
237 ++base;
238 }
239}
240
241static void
242sighandler (int signum)
243{
244 signals [signum - 1].gotsig = 1;
245
246 if (!gotsig)
247 {
248 gotsig = 1;
249 write (sigpipe [1], &gotsig, 1);
250 }
251}
252
253static void
254sigcb (struct ev_io *iow, int revents)
255{
256 struct ev_signal *w;
257 int sig;
258
259 gotsig = 0;
260 read (sigpipe [0], &revents, 1);
261
262 for (sig = signalmax; sig--; )
263 if (signals [sig].gotsig)
264 {
265 signals [sig].gotsig = 0;
266
267 for (w = signals [sig].head; w; w = w->next)
268 event ((W)w, EV_SIGNAL);
269 } 873 }
270} 874}
271 875
272static void 876/* do not submit kernel events for fds that have reify set */
273siginit (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)
274{ 880{
275 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); 881 ANFD *anfd = anfds + fd;
276 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277 882
278 /* rather than sort out wether we really need nb, set it */ 883 if (expect_true (!anfd->reify))
279 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 884 fd_event_nc (EV_A_ fd, revents);
280 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
281
282 evio_set (&sigev, sigpipe [0], EV_READ);
283 evio_start (&sigev);
284} 885}
285 886
286/*****************************************************************************/ 887void
287 888ev_feed_fd_event (EV_P_ int fd, int revents)
288static struct ev_idle **idles;
289static int idlemax, idlecnt;
290
291static struct ev_check **checks;
292static int checkmax, checkcnt;
293
294/*****************************************************************************/
295
296#if HAVE_EPOLL
297# include "ev_epoll.c"
298#endif
299#if HAVE_SELECT
300# include "ev_select.c"
301#endif
302
303int ev_init (int flags)
304{ 889{
305#if HAVE_MONOTONIC 890 if (fd >= 0 && fd < anfdmax)
306 { 891 fd_event_nc (EV_A_ fd, revents);
307 struct timespec ts;
308 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309 have_monotonic = 1;
310 }
311#endif
312
313 ev_now = ev_time ();
314 now = get_clock ();
315 diff = ev_now - now;
316
317 if (pipe (sigpipe))
318 return 0;
319
320 ev_method = EVMETHOD_NONE;
321#if HAVE_EPOLL
322 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
323#endif
324#if HAVE_SELECT
325 if (ev_method == EVMETHOD_NONE) select_init (flags);
326#endif
327
328 if (ev_method)
329 {
330 evw_init (&sigev, sigcb, 0);
331 siginit ();
332 }
333
334 return ev_method;
335} 892}
336 893
337/*****************************************************************************/ 894/* make sure the external fd watch events are in-sync */
338 895/* with the kernel/libev internal state */
339void ev_prefork (void) 896inline_size void
340{ 897fd_reify (EV_P)
341 /* nop */
342}
343
344void ev_postfork_parent (void)
345{
346 /* nop */
347}
348
349void ev_postfork_child (void)
350{
351#if HAVE_EPOLL
352 if (ev_method == EVMETHOD_EPOLL)
353 epoll_postfork_child ();
354#endif
355
356 evio_stop (&sigev);
357 close (sigpipe [0]);
358 close (sigpipe [1]);
359 pipe (sigpipe);
360 siginit ();
361}
362
363/*****************************************************************************/
364
365static void
366fd_reify (void)
367{ 898{
368 int i; 899 int i;
369 900
370 for (i = 0; i < fdchangecnt; ++i) 901 for (i = 0; i < fdchangecnt; ++i)
371 { 902 {
372 int fd = fdchanges [i]; 903 int fd = fdchanges [i];
373 ANFD *anfd = anfds + fd; 904 ANFD *anfd = anfds + fd;
374 struct ev_io *w; 905 ev_io *w;
375 906
376 int wev = 0; 907 unsigned char events = 0;
377 908
378 for (w = anfd->head; w; w = w->next) 909 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
379 wev |= w->events; 910 events |= (unsigned char)w->events;
380 911
381 if (anfd->wev != wev) 912#if EV_SELECT_IS_WINSOCKET
913 if (events)
382 { 914 {
383 method_modify (fd, anfd->wev, wev); 915 unsigned long arg;
384 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));
385 } 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 }
386 } 931 }
387 932
388 fdchangecnt = 0; 933 fdchangecnt = 0;
389} 934}
390 935
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) */
391static void 1248static void
392call_pending () 1249pipecb (EV_P_ ev_io *iow, int revents)
393{ 1250{
394 int i; 1251 int i;
395 1252
396 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));
397 { 1258 }
398 ANPENDING *p = pendings + i; 1259 else
1260#endif
1261 {
1262 char dummy;
1263 read (evpipe [0], &dummy, 1);
1264 }
399 1265
400 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)))
401 { 1374 {
402 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 */
403 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);
404 } 1379 }
405 } 1380 }
406
407 pendingcnt = 0;
408} 1381}
409 1382
1383#ifndef WCONTINUED
1384# define WCONTINUED 0
1385#endif
1386
1387/* called on sigchld etc., calls waitpid */
410static void 1388static void
411timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now) 1389childcb (EV_P_ ev_signal *sw, int revents)
412{ 1390{
413 while (timercnt && timers [0]->at <= now) 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_NOSIGFD ? -1 : -2;
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)
414 { 1854 {
415 struct ev_timer *w = timers [0]; 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 }
416 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
2029timers_reify (EV_P)
2030{
2031 EV_FREQUENT_CHECK;
2032
2033 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2034 {
2035 do
2036 {
2037 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
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 if (w->is_abs)
421 w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
422 else
423 w->at = now + w->repeat; 2602 ev_at (w) = mn_now + w->repeat;
424 2603 ANHE_at_cache (timers [ev_active (w)]);
425 assert (w->at > now);
426
427 downheap (timers, timercnt, 0); 2604 adjustheap (timers, timercnt, ev_active (w));
428 } 2605 }
429 else 2606 else
2607 ev_timer_stop (EV_A_ w);
2608 }
2609 else if (w->repeat)
2610 {
2611 ev_at (w) = w->repeat;
2612 ev_timer_start (EV_A_ w);
2613 }
2614
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);
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)
430 { 2722 {
431 evtimer_stop (w); /* nonrepeating: stop timer */ 2723 fd_intern (sigfd); /* doing it twice will not hurt */
432 --timercnt; /* maybe pass by reference instead? */ 2724
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 */
433 } 2731 }
2732 }
434 2733
435 event ((W)w, EV_TIMEOUT); 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 sigprocmask (SIG_UNBLOCK, &sigfd_set, 0);//D
2796 sigdelset (&sigfd_set, w->signum);
2797 signalfd (sigfd, &sigfd_set, 0);
2798 sigprocmask (SIG_BLOCK, &sigfd_set, 0);//D
2799 /*TODO: maybe unblock signal? */
2800 }
2801 else
2802#endif
2803 signal (w->signum, SIG_DFL);
2804 }
2805
2806 EV_FREQUENT_CHECK;
2807}
2808
2809void
2810ev_child_start (EV_P_ ev_child *w)
2811{
2812#if EV_MULTIPLICITY
2813 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2814#endif
2815 if (expect_false (ev_is_active (w)))
2816 return;
2817
2818 EV_FREQUENT_CHECK;
2819
2820 ev_start (EV_A_ (W)w, 1);
2821 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2822
2823 EV_FREQUENT_CHECK;
2824}
2825
2826void
2827ev_child_stop (EV_P_ ev_child *w)
2828{
2829 clear_pending (EV_A_ (W)w);
2830 if (expect_false (!ev_is_active (w)))
2831 return;
2832
2833 EV_FREQUENT_CHECK;
2834
2835 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2836 ev_stop (EV_A_ (W)w);
2837
2838 EV_FREQUENT_CHECK;
2839}
2840
2841#if EV_STAT_ENABLE
2842
2843# ifdef _WIN32
2844# undef lstat
2845# define lstat(a,b) _stati64 (a,b)
2846# endif
2847
2848#define DEF_STAT_INTERVAL 5.0074891
2849#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2850#define MIN_STAT_INTERVAL 0.1074891
2851
2852static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2853
2854#if EV_USE_INOTIFY
2855# define EV_INOTIFY_BUFSIZE 8192
2856
2857static void noinline
2858infy_add (EV_P_ ev_stat *w)
2859{
2860 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);
2861
2862 if (w->wd >= 0)
2863 {
2864 struct statfs sfs;
2865
2866 /* now local changes will be tracked by inotify, but remote changes won't */
2867 /* unless the filesystem is known to be local, we therefore still poll */
2868 /* also do poll on <2.6.25, but with normal frequency */
2869
2870 if (!fs_2625)
2871 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2872 else if (!statfs (w->path, &sfs)
2873 && (sfs.f_type == 0x1373 /* devfs */
2874 || sfs.f_type == 0xEF53 /* ext2/3 */
2875 || sfs.f_type == 0x3153464a /* jfs */
2876 || sfs.f_type == 0x52654973 /* reiser3 */
2877 || sfs.f_type == 0x01021994 /* tempfs */
2878 || sfs.f_type == 0x58465342 /* xfs */))
2879 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
2880 else
2881 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
2882 }
2883 else
2884 {
2885 /* can't use inotify, continue to stat */
2886 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2887
2888 /* if path is not there, monitor some parent directory for speedup hints */
2889 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2890 /* but an efficiency issue only */
2891 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2892 {
2893 char path [4096];
2894 strcpy (path, w->path);
2895
2896 do
2897 {
2898 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2899 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2900
2901 char *pend = strrchr (path, '/');
2902
2903 if (!pend || pend == path)
2904 break;
2905
2906 *pend = 0;
2907 w->wd = inotify_add_watch (fs_fd, path, mask);
2908 }
2909 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2910 }
2911 }
2912
2913 if (w->wd >= 0)
2914 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2915
2916 /* now re-arm timer, if required */
2917 if (ev_is_active (&w->timer)) ev_ref (EV_A);
2918 ev_timer_again (EV_A_ &w->timer);
2919 if (ev_is_active (&w->timer)) ev_unref (EV_A);
2920}
2921
2922static void noinline
2923infy_del (EV_P_ ev_stat *w)
2924{
2925 int slot;
2926 int wd = w->wd;
2927
2928 if (wd < 0)
2929 return;
2930
2931 w->wd = -2;
2932 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2933 wlist_del (&fs_hash [slot].head, (WL)w);
2934
2935 /* remove this watcher, if others are watching it, they will rearm */
2936 inotify_rm_watch (fs_fd, wd);
2937}
2938
2939static void noinline
2940infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2941{
2942 if (slot < 0)
2943 /* overflow, need to check for all hash slots */
2944 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2945 infy_wd (EV_A_ slot, wd, ev);
2946 else
2947 {
2948 WL w_;
2949
2950 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2951 {
2952 ev_stat *w = (ev_stat *)w_;
2953 w_ = w_->next; /* lets us remove this watcher and all before it */
2954
2955 if (w->wd == wd || wd == -1)
2956 {
2957 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2958 {
2959 wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2960 w->wd = -1;
2961 infy_add (EV_A_ w); /* re-add, no matter what */
2962 }
2963
2964 stat_timer_cb (EV_A_ &w->timer, 0);
2965 }
2966 }
436 } 2967 }
437} 2968}
438 2969
439static void 2970static void
440time_update () 2971infy_cb (EV_P_ ev_io *w, int revents)
441{ 2972{
2973 char buf [EV_INOTIFY_BUFSIZE];
2974 struct inotify_event *ev = (struct inotify_event *)buf;
442 int i; 2975 int ofs;
443 ev_now = ev_time (); 2976 int len = read (fs_fd, buf, sizeof (buf));
444 2977
445 if (have_monotonic) 2978 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2979 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2980}
2981
2982inline_size void
2983check_2625 (EV_P)
2984{
2985 /* kernels < 2.6.25 are borked
2986 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
2987 */
2988 struct utsname buf;
2989 int major, minor, micro;
2990
2991 if (uname (&buf))
2992 return;
2993
2994 if (sscanf (buf.release, "%d.%d.%d", &major, &minor, &micro) != 3)
2995 return;
2996
2997 if (major < 2
2998 || (major == 2 && minor < 6)
2999 || (major == 2 && minor == 6 && micro < 25))
3000 return;
3001
3002 fs_2625 = 1;
3003}
3004
3005inline_size int
3006infy_newfd (void)
3007{
3008#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3009 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3010 if (fd >= 0)
3011 return fd;
3012#endif
3013 return inotify_init ();
3014}
3015
3016inline_size void
3017infy_init (EV_P)
3018{
3019 if (fs_fd != -2)
3020 return;
3021
3022 fs_fd = -1;
3023
3024 check_2625 (EV_A);
3025
3026 fs_fd = infy_newfd ();
3027
3028 if (fs_fd >= 0)
3029 {
3030 fd_intern (fs_fd);
3031 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3032 ev_set_priority (&fs_w, EV_MAXPRI);
3033 ev_io_start (EV_A_ &fs_w);
3034 ev_unref (EV_A);
446 { 3035 }
447 ev_tstamp odiff = diff; 3036}
448 3037
449 /* detecting time jumps is much more difficult */ 3038inline_size void
450 for (i = 2; --i; ) /* loop a few times, before making important decisions */ 3039infy_fork (EV_P)
3040{
3041 int slot;
3042
3043 if (fs_fd < 0)
3044 return;
3045
3046 ev_ref (EV_A);
3047 ev_io_stop (EV_A_ &fs_w);
3048 close (fs_fd);
3049 fs_fd = infy_newfd ();
3050
3051 if (fs_fd >= 0)
3052 {
3053 fd_intern (fs_fd);
3054 ev_io_set (&fs_w, fs_fd, EV_READ);
3055 ev_io_start (EV_A_ &fs_w);
3056 ev_unref (EV_A);
3057 }
3058
3059 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
3060 {
3061 WL w_ = fs_hash [slot].head;
3062 fs_hash [slot].head = 0;
3063
3064 while (w_)
451 { 3065 {
452 now = get_clock (); 3066 ev_stat *w = (ev_stat *)w_;
453 diff = ev_now - now; 3067 w_ = w_->next; /* lets us add this watcher */
454 3068
455 if (fabs (odiff - diff) < MIN_TIMEJUMP) 3069 w->wd = -1;
456 return; /* all is well */
457 3070
458 ev_now = ev_time (); 3071 if (fs_fd >= 0)
3072 infy_add (EV_A_ w); /* re-add, no matter what */
3073 else
3074 {
3075 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3076 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3077 ev_timer_again (EV_A_ &w->timer);
3078 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3079 }
459 } 3080 }
3081 }
3082}
460 3083
461 /* time jump detected, reschedule atimers */ 3084#endif
3085
3086#ifdef _WIN32
3087# define EV_LSTAT(p,b) _stati64 (p, b)
3088#else
3089# define EV_LSTAT(p,b) lstat (p, b)
3090#endif
3091
3092void
3093ev_stat_stat (EV_P_ ev_stat *w)
3094{
3095 if (lstat (w->path, &w->attr) < 0)
3096 w->attr.st_nlink = 0;
3097 else if (!w->attr.st_nlink)
3098 w->attr.st_nlink = 1;
3099}
3100
3101static void noinline
3102stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3103{
3104 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3105
3106 /* we copy this here each the time so that */
3107 /* prev has the old value when the callback gets invoked */
3108 w->prev = w->attr;
3109 ev_stat_stat (EV_A_ w);
3110
3111 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3112 if (
3113 w->prev.st_dev != w->attr.st_dev
3114 || w->prev.st_ino != w->attr.st_ino
3115 || w->prev.st_mode != w->attr.st_mode
3116 || w->prev.st_nlink != w->attr.st_nlink
3117 || w->prev.st_uid != w->attr.st_uid
3118 || w->prev.st_gid != w->attr.st_gid
3119 || w->prev.st_rdev != w->attr.st_rdev
3120 || w->prev.st_size != w->attr.st_size
3121 || w->prev.st_atime != w->attr.st_atime
3122 || w->prev.st_mtime != w->attr.st_mtime
3123 || w->prev.st_ctime != w->attr.st_ctime
3124 ) {
3125 #if EV_USE_INOTIFY
3126 if (fs_fd >= 0)
3127 {
3128 infy_del (EV_A_ w);
3129 infy_add (EV_A_ w);
3130 ev_stat_stat (EV_A_ w); /* avoid race... */
3131 }
3132 #endif
3133
3134 ev_feed_event (EV_A_ w, EV_STAT);
3135 }
3136}
3137
3138void
3139ev_stat_start (EV_P_ ev_stat *w)
3140{
3141 if (expect_false (ev_is_active (w)))
3142 return;
3143
3144 ev_stat_stat (EV_A_ w);
3145
3146 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3147 w->interval = MIN_STAT_INTERVAL;
3148
3149 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3150 ev_set_priority (&w->timer, ev_priority (w));
3151
3152#if EV_USE_INOTIFY
3153 infy_init (EV_A);
3154
3155 if (fs_fd >= 0)
3156 infy_add (EV_A_ w);
3157 else
3158#endif
3159 {
3160 ev_timer_again (EV_A_ &w->timer);
3161 ev_unref (EV_A);
3162 }
3163
3164 ev_start (EV_A_ (W)w, 1);
3165
3166 EV_FREQUENT_CHECK;
3167}
3168
3169void
3170ev_stat_stop (EV_P_ ev_stat *w)
3171{
3172 clear_pending (EV_A_ (W)w);
3173 if (expect_false (!ev_is_active (w)))
3174 return;
3175
3176 EV_FREQUENT_CHECK;
3177
3178#if EV_USE_INOTIFY
3179 infy_del (EV_A_ w);
3180#endif
3181
3182 if (ev_is_active (&w->timer))
3183 {
3184 ev_ref (EV_A);
3185 ev_timer_stop (EV_A_ &w->timer);
3186 }
3187
3188 ev_stop (EV_A_ (W)w);
3189
3190 EV_FREQUENT_CHECK;
3191}
3192#endif
3193
3194#if EV_IDLE_ENABLE
3195void
3196ev_idle_start (EV_P_ ev_idle *w)
3197{
3198 if (expect_false (ev_is_active (w)))
3199 return;
3200
3201 pri_adjust (EV_A_ (W)w);
3202
3203 EV_FREQUENT_CHECK;
3204
3205 {
3206 int active = ++idlecnt [ABSPRI (w)];
3207
3208 ++idleall;
3209 ev_start (EV_A_ (W)w, active);
3210
3211 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3212 idles [ABSPRI (w)][active - 1] = w;
3213 }
3214
3215 EV_FREQUENT_CHECK;
3216}
3217
3218void
3219ev_idle_stop (EV_P_ ev_idle *w)
3220{
3221 clear_pending (EV_A_ (W)w);
3222 if (expect_false (!ev_is_active (w)))
3223 return;
3224
3225 EV_FREQUENT_CHECK;
3226
3227 {
3228 int active = ev_active (w);
3229
3230 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3231 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3232
3233 ev_stop (EV_A_ (W)w);
3234 --idleall;
3235 }
3236
3237 EV_FREQUENT_CHECK;
3238}
3239#endif
3240
3241void
3242ev_prepare_start (EV_P_ ev_prepare *w)
3243{
3244 if (expect_false (ev_is_active (w)))
3245 return;
3246
3247 EV_FREQUENT_CHECK;
3248
3249 ev_start (EV_A_ (W)w, ++preparecnt);
3250 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3251 prepares [preparecnt - 1] = w;
3252
3253 EV_FREQUENT_CHECK;
3254}
3255
3256void
3257ev_prepare_stop (EV_P_ ev_prepare *w)
3258{
3259 clear_pending (EV_A_ (W)w);
3260 if (expect_false (!ev_is_active (w)))
3261 return;
3262
3263 EV_FREQUENT_CHECK;
3264
3265 {
3266 int active = ev_active (w);
3267
3268 prepares [active - 1] = prepares [--preparecnt];
3269 ev_active (prepares [active - 1]) = active;
3270 }
3271
3272 ev_stop (EV_A_ (W)w);
3273
3274 EV_FREQUENT_CHECK;
3275}
3276
3277void
3278ev_check_start (EV_P_ ev_check *w)
3279{
3280 if (expect_false (ev_is_active (w)))
3281 return;
3282
3283 EV_FREQUENT_CHECK;
3284
3285 ev_start (EV_A_ (W)w, ++checkcnt);
3286 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3287 checks [checkcnt - 1] = w;
3288
3289 EV_FREQUENT_CHECK;
3290}
3291
3292void
3293ev_check_stop (EV_P_ ev_check *w)
3294{
3295 clear_pending (EV_A_ (W)w);
3296 if (expect_false (!ev_is_active (w)))
3297 return;
3298
3299 EV_FREQUENT_CHECK;
3300
3301 {
3302 int active = ev_active (w);
3303
3304 checks [active - 1] = checks [--checkcnt];
3305 ev_active (checks [active - 1]) = active;
3306 }
3307
3308 ev_stop (EV_A_ (W)w);
3309
3310 EV_FREQUENT_CHECK;
3311}
3312
3313#if EV_EMBED_ENABLE
3314void noinline
3315ev_embed_sweep (EV_P_ ev_embed *w)
3316{
3317 ev_loop (w->other, EVLOOP_NONBLOCK);
3318}
3319
3320static void
3321embed_io_cb (EV_P_ ev_io *io, int revents)
3322{
3323 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3324
3325 if (ev_cb (w))
3326 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3327 else
3328 ev_loop (w->other, EVLOOP_NONBLOCK);
3329}
3330
3331static void
3332embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3333{
3334 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3335
3336 {
3337 EV_P = w->other;
3338
3339 while (fdchangecnt)
3340 {
3341 fd_reify (EV_A);
3342 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3343 }
3344 }
3345}
3346
3347static void
3348embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3349{
3350 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3351
3352 ev_embed_stop (EV_A_ w);
3353
3354 {
3355 EV_P = w->other;
3356
3357 ev_loop_fork (EV_A);
3358 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3359 }
3360
3361 ev_embed_start (EV_A_ w);
3362}
3363
3364#if 0
3365static void
3366embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3367{
3368 ev_idle_stop (EV_A_ idle);
3369}
3370#endif
3371
3372void
3373ev_embed_start (EV_P_ ev_embed *w)
3374{
3375 if (expect_false (ev_is_active (w)))
3376 return;
3377
3378 {
3379 EV_P = w->other;
3380 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3381 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3382 }
3383
3384 EV_FREQUENT_CHECK;
3385
3386 ev_set_priority (&w->io, ev_priority (w));
3387 ev_io_start (EV_A_ &w->io);
3388
3389 ev_prepare_init (&w->prepare, embed_prepare_cb);
3390 ev_set_priority (&w->prepare, EV_MINPRI);
3391 ev_prepare_start (EV_A_ &w->prepare);
3392
3393 ev_fork_init (&w->fork, embed_fork_cb);
3394 ev_fork_start (EV_A_ &w->fork);
3395
3396 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3397
3398 ev_start (EV_A_ (W)w, 1);
3399
3400 EV_FREQUENT_CHECK;
3401}
3402
3403void
3404ev_embed_stop (EV_P_ ev_embed *w)
3405{
3406 clear_pending (EV_A_ (W)w);
3407 if (expect_false (!ev_is_active (w)))
3408 return;
3409
3410 EV_FREQUENT_CHECK;
3411
3412 ev_io_stop (EV_A_ &w->io);
3413 ev_prepare_stop (EV_A_ &w->prepare);
3414 ev_fork_stop (EV_A_ &w->fork);
3415
3416 EV_FREQUENT_CHECK;
3417}
3418#endif
3419
3420#if EV_FORK_ENABLE
3421void
3422ev_fork_start (EV_P_ ev_fork *w)
3423{
3424 if (expect_false (ev_is_active (w)))
3425 return;
3426
3427 EV_FREQUENT_CHECK;
3428
3429 ev_start (EV_A_ (W)w, ++forkcnt);
3430 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3431 forks [forkcnt - 1] = w;
3432
3433 EV_FREQUENT_CHECK;
3434}
3435
3436void
3437ev_fork_stop (EV_P_ ev_fork *w)
3438{
3439 clear_pending (EV_A_ (W)w);
3440 if (expect_false (!ev_is_active (w)))
3441 return;
3442
3443 EV_FREQUENT_CHECK;
3444
3445 {
3446 int active = ev_active (w);
3447
3448 forks [active - 1] = forks [--forkcnt];
3449 ev_active (forks [active - 1]) = active;
3450 }
3451
3452 ev_stop (EV_A_ (W)w);
3453
3454 EV_FREQUENT_CHECK;
3455}
3456#endif
3457
3458#if EV_ASYNC_ENABLE
3459void
3460ev_async_start (EV_P_ ev_async *w)
3461{
3462 if (expect_false (ev_is_active (w)))
3463 return;
3464
3465 evpipe_init (EV_A);
3466
3467 EV_FREQUENT_CHECK;
3468
3469 ev_start (EV_A_ (W)w, ++asynccnt);
3470 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3471 asyncs [asynccnt - 1] = w;
3472
3473 EV_FREQUENT_CHECK;
3474}
3475
3476void
3477ev_async_stop (EV_P_ ev_async *w)
3478{
3479 clear_pending (EV_A_ (W)w);
3480 if (expect_false (!ev_is_active (w)))
3481 return;
3482
3483 EV_FREQUENT_CHECK;
3484
3485 {
3486 int active = ev_active (w);
3487
3488 asyncs [active - 1] = asyncs [--asynccnt];
3489 ev_active (asyncs [active - 1]) = active;
3490 }
3491
3492 ev_stop (EV_A_ (W)w);
3493
3494 EV_FREQUENT_CHECK;
3495}
3496
3497void
3498ev_async_send (EV_P_ ev_async *w)
3499{
3500 w->sent = 1;
3501 evpipe_write (EV_A_ &async_pending);
3502}
3503#endif
3504
3505/*****************************************************************************/
3506
3507struct ev_once
3508{
3509 ev_io io;
3510 ev_timer to;
3511 void (*cb)(int revents, void *arg);
3512 void *arg;
3513};
3514
3515static void
3516once_cb (EV_P_ struct ev_once *once, int revents)
3517{
3518 void (*cb)(int revents, void *arg) = once->cb;
3519 void *arg = once->arg;
3520
3521 ev_io_stop (EV_A_ &once->io);
3522 ev_timer_stop (EV_A_ &once->to);
3523 ev_free (once);
3524
3525 cb (revents, arg);
3526}
3527
3528static void
3529once_cb_io (EV_P_ ev_io *w, int revents)
3530{
3531 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3532
3533 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3534}
3535
3536static void
3537once_cb_to (EV_P_ ev_timer *w, int revents)
3538{
3539 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3540
3541 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3542}
3543
3544void
3545ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3546{
3547 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3548
3549 if (expect_false (!once))
3550 {
3551 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3552 return;
3553 }
3554
3555 once->cb = cb;
3556 once->arg = arg;
3557
3558 ev_init (&once->io, once_cb_io);
3559 if (fd >= 0)
3560 {
3561 ev_io_set (&once->io, fd, events);
3562 ev_io_start (EV_A_ &once->io);
3563 }
3564
3565 ev_init (&once->to, once_cb_to);
3566 if (timeout >= 0.)
3567 {
3568 ev_timer_set (&once->to, timeout, 0.);
3569 ev_timer_start (EV_A_ &once->to);
3570 }
3571}
3572
3573/*****************************************************************************/
3574
3575#if EV_WALK_ENABLE
3576void
3577ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3578{
3579 int i, j;
3580 ev_watcher_list *wl, *wn;
3581
3582 if (types & (EV_IO | EV_EMBED))
462 for (i = 0; i < atimercnt; ++i) 3583 for (i = 0; i < anfdmax; ++i)
3584 for (wl = anfds [i].head; wl; )
463 { 3585 {
464 struct ev_timer *w = atimers [i]; 3586 wn = wl->next;
465 w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat; 3587
3588#if EV_EMBED_ENABLE
3589 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3590 {
3591 if (types & EV_EMBED)
3592 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3593 }
3594 else
3595#endif
3596#if EV_USE_INOTIFY
3597 if (ev_cb ((ev_io *)wl) == infy_cb)
3598 ;
3599 else
3600#endif
3601 if ((ev_io *)wl != &pipe_w)
3602 if (types & EV_IO)
3603 cb (EV_A_ EV_IO, wl);
3604
3605 wl = wn;
466 } 3606 }
467 }
468 else
469 {
470 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
471 /* time jump detected, adjust rtimers */
472 for (i = 0; i < rtimercnt; ++i)
473 rtimers [i]->at += ev_now - now;
474 3607
475 now = ev_now; 3608 if (types & (EV_TIMER | EV_STAT))
476 } 3609 for (i = timercnt + HEAP0; i-- > HEAP0; )
477} 3610#if EV_STAT_ENABLE
478 3611 /*TODO: timer is not always active*/
479int ev_loop_done; 3612 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
480 3613 {
481void ev_loop (int flags) 3614 if (types & EV_STAT)
482{ 3615 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
483 double block; 3616 }
484 ev_loop_done = flags & EVLOOP_ONESHOT;
485
486 if (checkcnt)
487 {
488 queue_events ((W *)checks, checkcnt, EV_CHECK);
489 call_pending ();
490 }
491
492 do
493 {
494 /* update fd-related kernel structures */
495 fd_reify ();
496
497 /* calculate blocking time */
498 if (flags & EVLOOP_NONBLOCK || idlecnt)
499 block = 0.;
500 else 3617 else
3618#endif
3619 if (types & EV_TIMER)
3620 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3621
3622#if EV_PERIODIC_ENABLE
3623 if (types & EV_PERIODIC)
3624 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3625 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3626#endif
3627
3628#if EV_IDLE_ENABLE
3629 if (types & EV_IDLE)
3630 for (j = NUMPRI; i--; )
3631 for (i = idlecnt [j]; i--; )
3632 cb (EV_A_ EV_IDLE, idles [j][i]);
3633#endif
3634
3635#if EV_FORK_ENABLE
3636 if (types & EV_FORK)
3637 for (i = forkcnt; i--; )
3638 if (ev_cb (forks [i]) != embed_fork_cb)
3639 cb (EV_A_ EV_FORK, forks [i]);
3640#endif
3641
3642#if EV_ASYNC_ENABLE
3643 if (types & EV_ASYNC)
3644 for (i = asynccnt; i--; )
3645 cb (EV_A_ EV_ASYNC, asyncs [i]);
3646#endif
3647
3648 if (types & EV_PREPARE)
3649 for (i = preparecnt; i--; )
3650#if EV_EMBED_ENABLE
3651 if (ev_cb (prepares [i]) != embed_prepare_cb)
3652#endif
3653 cb (EV_A_ EV_PREPARE, prepares [i]);
3654
3655 if (types & EV_CHECK)
3656 for (i = checkcnt; i--; )
3657 cb (EV_A_ EV_CHECK, checks [i]);
3658
3659 if (types & EV_SIGNAL)
3660 for (i = 0; i < EV_NSIG - 1; ++i)
3661 for (wl = signals [i].head; wl; )
501 { 3662 {
502 block = MAX_BLOCKTIME; 3663 wn = wl->next;
503 3664 cb (EV_A_ EV_SIGNAL, wl);
504 if (rtimercnt) 3665 wl = wn;
505 {
506 ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;
507 if (block > to) block = to;
508 }
509
510 if (atimercnt)
511 {
512 ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;
513 if (block > to) block = to;
514 }
515
516 if (block < 0.) block = 0.;
517 } 3666 }
518 3667
519 method_poll (block); 3668 if (types & EV_CHILD)
520 3669 for (i = EV_PID_HASHSIZE; i--; )
521 /* update ev_now, do magic */ 3670 for (wl = childs [i]; wl; )
522 time_update ();
523
524 /* queue pending timers and reschedule them */
525 /* absolute timers first */
526 timers_reify (atimers, atimercnt, ev_now);
527 /* relative timers second */
528 timers_reify (rtimers, rtimercnt, now);
529
530 /* queue idle watchers unless io or timers are pending */
531 if (!pendingcnt)
532 queue_events ((W *)idles, idlecnt, EV_IDLE);
533
534 /* queue check and possibly idle watchers */
535 queue_events ((W *)checks, checkcnt, EV_CHECK);
536
537 call_pending ();
538 }
539 while (!ev_loop_done);
540}
541
542/*****************************************************************************/
543
544static void
545wlist_add (WL *head, WL elem)
546{
547 elem->next = *head;
548 *head = elem;
549}
550
551static void
552wlist_del (WL *head, WL elem)
553{
554 while (*head)
555 {
556 if (*head == elem)
557 { 3671 {
558 *head = elem->next; 3672 wn = wl->next;
559 return; 3673 cb (EV_A_ EV_CHILD, wl);
3674 wl = wn;
560 } 3675 }
561 3676/* EV_STAT 0x00001000 /* stat data changed */
562 head = &(*head)->next; 3677/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
563 }
564} 3678}
565
566static void
567ev_start (W w, int active)
568{
569 w->pending = 0;
570 w->active = active;
571}
572
573static void
574ev_stop (W w)
575{
576 if (w->pending)
577 pendings [w->pending - 1].w = 0;
578
579 w->active = 0;
580}
581
582/*****************************************************************************/
583
584void
585evio_start (struct ev_io *w)
586{
587 if (ev_is_active (w))
588 return;
589
590 int fd = w->fd;
591
592 ev_start ((W)w, 1);
593 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
594 wlist_add ((WL *)&anfds[fd].head, (WL)w);
595
596 ++fdchangecnt;
597 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598 fdchanges [fdchangecnt - 1] = fd;
599}
600
601void
602evio_stop (struct ev_io *w)
603{
604 if (!ev_is_active (w))
605 return;
606
607 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
608 ev_stop ((W)w);
609
610 ++fdchangecnt;
611 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
612 fdchanges [fdchangecnt - 1] = w->fd;
613}
614
615void
616evtimer_start (struct ev_timer *w)
617{
618 if (ev_is_active (w))
619 return;
620
621 if (w->is_abs)
622 {
623 /* this formula differs from the one in timer_reify becuse we do not round up */
624 if (w->repeat)
625 w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
626
627 ev_start ((W)w, ++atimercnt);
628 array_needsize (atimers, atimermax, atimercnt, );
629 atimers [atimercnt - 1] = w;
630 upheap (atimers, atimercnt - 1);
631 }
632 else
633 {
634 w->at += now;
635
636 ev_start ((W)w, ++rtimercnt);
637 array_needsize (rtimers, rtimermax, rtimercnt, );
638 rtimers [rtimercnt - 1] = w;
639 upheap (rtimers, rtimercnt - 1);
640 }
641
642}
643
644void
645evtimer_stop (struct ev_timer *w)
646{
647 if (!ev_is_active (w))
648 return;
649
650 if (w->is_abs)
651 {
652 if (w->active < atimercnt--)
653 {
654 atimers [w->active - 1] = atimers [atimercnt];
655 downheap (atimers, atimercnt, w->active - 1);
656 }
657 }
658 else
659 {
660 if (w->active < rtimercnt--)
661 {
662 rtimers [w->active - 1] = rtimers [rtimercnt];
663 downheap (rtimers, rtimercnt, w->active - 1);
664 }
665 }
666
667 ev_stop ((W)w);
668}
669
670void
671evsignal_start (struct ev_signal *w)
672{
673 if (ev_is_active (w))
674 return;
675
676 ev_start ((W)w, 1);
677 array_needsize (signals, signalmax, w->signum, signals_init);
678 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
679
680 if (!w->next)
681 {
682 struct sigaction sa;
683 sa.sa_handler = sighandler;
684 sigfillset (&sa.sa_mask);
685 sa.sa_flags = 0;
686 sigaction (w->signum, &sa, 0);
687 }
688}
689
690void
691evsignal_stop (struct ev_signal *w)
692{
693 if (!ev_is_active (w))
694 return;
695
696 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
697 ev_stop ((W)w);
698
699 if (!signals [w->signum - 1].head)
700 signal (w->signum, SIG_DFL);
701}
702
703void evidle_start (struct ev_idle *w)
704{
705 if (ev_is_active (w))
706 return;
707
708 ev_start ((W)w, ++idlecnt);
709 array_needsize (idles, idlemax, idlecnt, );
710 idles [idlecnt - 1] = w;
711}
712
713void evidle_stop (struct ev_idle *w)
714{
715 idles [w->active - 1] = idles [--idlecnt];
716 ev_stop ((W)w);
717}
718
719void evcheck_start (struct ev_check *w)
720{
721 if (ev_is_active (w))
722 return;
723
724 ev_start ((W)w, ++checkcnt);
725 array_needsize (checks, checkmax, checkcnt, );
726 checks [checkcnt - 1] = w;
727}
728
729void evcheck_stop (struct ev_check *w)
730{
731 checks [w->active - 1] = checks [--checkcnt];
732 ev_stop ((W)w);
733}
734
735/*****************************************************************************/
736
737#if 0
738
739static void
740sin_cb (struct ev_io *w, int revents)
741{
742 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
743}
744
745static void
746ocb (struct ev_timer *w, int revents)
747{
748 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
749 evtimer_stop (w);
750 evtimer_start (w);
751}
752
753static void
754scb (struct ev_signal *w, int revents)
755{
756 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
757}
758
759static void
760gcb (struct ev_signal *w, int revents)
761{
762 fprintf (stderr, "generic %x\n", revents);
763}
764
765int main (void)
766{
767 struct ev_io sin;
768
769 ev_init (0);
770
771 evw_init (&sin, sin_cb, 55);
772 evio_set (&sin, 0, EV_READ);
773 evio_start (&sin);
774
775 struct ev_timer t[10000];
776
777#if 0
778 int i;
779 for (i = 0; i < 10000; ++i)
780 {
781 struct ev_timer *w = t + i;
782 evw_init (w, ocb, i);
783 evtimer_set_abs (w, drand48 (), 0.99775533);
784 evtimer_start (w);
785 if (drand48 () < 0.5)
786 evtimer_stop (w);
787 }
788#endif 3679#endif
789 3680
790 struct ev_timer t1; 3681#if EV_MULTIPLICITY
791 evw_init (&t1, ocb, 0); 3682 #include "ev_wrap.h"
792 evtimer_set_abs (&t1, 5, 10);
793 evtimer_start (&t1);
794
795 struct ev_signal sig;
796 evw_init (&sig, scb, 65535);
797 evsignal_set (&sig, SIGQUIT);
798 evsignal_start (&sig);
799
800 struct ev_check cw;
801 evw_init (&cw, gcb, 0);
802 evcheck_start (&cw);
803
804 struct ev_idle iw;
805 evw_init (&iw, gcb, 0);
806 evidle_start (&iw);
807
808 ev_loop (0);
809
810 return 0;
811}
812
813#endif 3683#endif
814 3684
3685#ifdef __cplusplus
3686}
3687#endif
815 3688
816
817

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines