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Comparing libev/ev.c (file contents):
Revision 1.20 by root, Wed Oct 31 18:28:00 2007 UTC vs.
Revision 1.333 by root, Tue Mar 9 08:58:22 2010 UTC

1/* 1/*
2 * libev event processing core, watcher management
3 *
2 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010 Marc Alexander Lehmann <libev@schmorp.de>
3 * All rights reserved. 5 * All rights reserved.
4 * 6 *
5 * Redistribution and use in source and binary forms, with or without 7 * Redistribution and use in source and binary forms, with or without modifica-
6 * modification, are permitted provided that the following conditions are 8 * tion, are permitted provided that the following conditions are met:
7 * 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.
8 * 27 *
9 * * Redistributions of source code must retain the above copyright 28 * Alternatively, the contents of this file may be used under the terms of
10 * notice, this list of conditions and the following disclaimer. 29 * the GNU General Public License ("GPL") version 2 or any later version,
11 * 30 * in which case the provisions of the GPL are applicable instead of
12 * * Redistributions in binary form must reproduce the above 31 * the above. If you wish to allow the use of your version of this file
13 * copyright notice, this list of conditions and the following 32 * only under the terms of the GPL and not to allow others to use your
14 * disclaimer in the documentation and/or other materials provided 33 * version of this file under the BSD license, indicate your decision
15 * with the distribution. 34 * by deleting the provisions above and replace them with the notice
16 * 35 * and other provisions required by the GPL. If you do not delete the
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 36 * provisions above, a recipient may use your version of this file under
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 37 * either the BSD or the GPL.
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */ 38 */
39
40#ifdef __cplusplus
41extern "C" {
42#endif
43
44/* this big block deduces configuration from config.h */
45#ifndef EV_STANDALONE
46# ifdef EV_CONFIG_H
47# include EV_CONFIG_H
48# else
49# include "config.h"
50# endif
51
52# if HAVE_CLOCK_SYSCALL
53# ifndef EV_USE_CLOCK_SYSCALL
54# define EV_USE_CLOCK_SYSCALL 1
55# ifndef EV_USE_REALTIME
56# define EV_USE_REALTIME 0
57# endif
58# ifndef EV_USE_MONOTONIC
59# define EV_USE_MONOTONIC 1
60# endif
61# endif
62# elif !defined(EV_USE_CLOCK_SYSCALL)
63# define EV_USE_CLOCK_SYSCALL 0
64# endif
65
66# if HAVE_CLOCK_GETTIME
67# ifndef EV_USE_MONOTONIC
68# define EV_USE_MONOTONIC 1
69# endif
70# ifndef EV_USE_REALTIME
71# define EV_USE_REALTIME 0
72# endif
73# else
74# ifndef EV_USE_MONOTONIC
75# define EV_USE_MONOTONIC 0
76# endif
77# ifndef EV_USE_REALTIME
78# define EV_USE_REALTIME 0
79# endif
80# endif
81
82# ifndef EV_USE_NANOSLEEP
83# if HAVE_NANOSLEEP
84# define EV_USE_NANOSLEEP 1
85# else
86# define EV_USE_NANOSLEEP 0
87# endif
88# endif
89
90# ifndef EV_USE_SELECT
91# if HAVE_SELECT && HAVE_SYS_SELECT_H
92# define EV_USE_SELECT 1
93# else
94# define EV_USE_SELECT 0
95# endif
96# endif
97
98# ifndef EV_USE_POLL
99# if HAVE_POLL && HAVE_POLL_H
100# define EV_USE_POLL 1
101# else
102# define EV_USE_POLL 0
103# endif
104# endif
105
106# ifndef EV_USE_EPOLL
107# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
108# define EV_USE_EPOLL 1
109# else
110# define EV_USE_EPOLL 0
111# endif
112# endif
113
114# ifndef EV_USE_KQUEUE
115# if HAVE_KQUEUE && HAVE_SYS_EVENT_H
116# define EV_USE_KQUEUE 1
117# else
118# define EV_USE_KQUEUE 0
119# endif
120# endif
121
122# ifndef EV_USE_PORT
123# if HAVE_PORT_H && HAVE_PORT_CREATE
124# define EV_USE_PORT 1
125# else
126# define EV_USE_PORT 0
127# endif
128# endif
129
130# ifndef EV_USE_INOTIFY
131# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
132# define EV_USE_INOTIFY 1
133# else
134# define EV_USE_INOTIFY 0
135# endif
136# endif
137
138# ifndef EV_USE_SIGNALFD
139# if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
140# define EV_USE_SIGNALFD 1
141# else
142# define EV_USE_SIGNALFD 0
143# endif
144# endif
145
146# ifndef EV_USE_EVENTFD
147# if HAVE_EVENTFD
148# define EV_USE_EVENTFD 1
149# else
150# define EV_USE_EVENTFD 0
151# endif
152# endif
153
154#endif
29 155
30#include <math.h> 156#include <math.h>
31#include <stdlib.h> 157#include <stdlib.h>
32#include <unistd.h> 158#include <string.h>
33#include <fcntl.h> 159#include <fcntl.h>
34#include <signal.h>
35#include <stddef.h> 160#include <stddef.h>
36 161
37#include <stdio.h> 162#include <stdio.h>
38 163
39#include <assert.h> 164#include <assert.h>
40#include <errno.h> 165#include <errno.h>
41#include <sys/time.h> 166#include <sys/types.h>
42#include <time.h> 167#include <time.h>
168#include <limits.h>
43 169
170#include <signal.h>
171
172#ifdef EV_H
173# include EV_H
174#else
175# include "ev.h"
176#endif
177
178#ifndef _WIN32
179# include <sys/time.h>
180# include <sys/wait.h>
181# include <unistd.h>
182#else
183# include <io.h>
184# define WIN32_LEAN_AND_MEAN
185# include <windows.h>
186# ifndef EV_SELECT_IS_WINSOCKET
187# define EV_SELECT_IS_WINSOCKET 1
188# endif
189# undef EV_AVOID_STDIO
190#endif
191
192/* this block tries to deduce configuration from header-defined symbols and defaults */
193
194/* try to deduce the maximum number of signals on this platform */
195#if defined (EV_NSIG)
196/* use what's provided */
197#elif defined (NSIG)
198# define EV_NSIG (NSIG)
199#elif defined(_NSIG)
200# define EV_NSIG (_NSIG)
201#elif defined (SIGMAX)
202# define EV_NSIG (SIGMAX+1)
203#elif defined (SIG_MAX)
204# define EV_NSIG (SIG_MAX+1)
205#elif defined (_SIG_MAX)
206# define EV_NSIG (_SIG_MAX+1)
207#elif defined (MAXSIG)
208# define EV_NSIG (MAXSIG+1)
209#elif defined (MAX_SIG)
210# define EV_NSIG (MAX_SIG+1)
211#elif defined (SIGARRAYSIZE)
212# define EV_NSIG SIGARRAYSIZE /* Assume ary[SIGARRAYSIZE] */
213#elif defined (_sys_nsig)
214# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
215#else
216# error "unable to find value for NSIG, please report"
217/* to make it compile regardless, just remove the above line */
218# define EV_NSIG 65
219#endif
220
221#ifndef EV_USE_CLOCK_SYSCALL
222# if __linux && __GLIBC__ >= 2
223# define EV_USE_CLOCK_SYSCALL 1
224# else
225# define EV_USE_CLOCK_SYSCALL 0
226# endif
227#endif
228
44#ifndef HAVE_MONOTONIC 229#ifndef EV_USE_MONOTONIC
230# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
231# define EV_USE_MONOTONIC 1
232# else
233# define EV_USE_MONOTONIC 0
234# endif
235#endif
236
237#ifndef EV_USE_REALTIME
238# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
239#endif
240
241#ifndef EV_USE_NANOSLEEP
242# if _POSIX_C_SOURCE >= 199309L
243# define EV_USE_NANOSLEEP 1
244# else
245# define EV_USE_NANOSLEEP 0
246# endif
247#endif
248
249#ifndef EV_USE_SELECT
250# define EV_USE_SELECT 1
251#endif
252
253#ifndef EV_USE_POLL
254# ifdef _WIN32
255# define EV_USE_POLL 0
256# else
257# define EV_USE_POLL 1
258# endif
259#endif
260
261#ifndef EV_USE_EPOLL
262# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
263# define EV_USE_EPOLL 1
264# else
265# define EV_USE_EPOLL 0
266# endif
267#endif
268
269#ifndef EV_USE_KQUEUE
270# define EV_USE_KQUEUE 0
271#endif
272
273#ifndef EV_USE_PORT
274# define EV_USE_PORT 0
275#endif
276
277#ifndef EV_USE_INOTIFY
278# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
279# define EV_USE_INOTIFY 1
280# else
281# define EV_USE_INOTIFY 0
282# endif
283#endif
284
285#ifndef EV_PID_HASHSIZE
286# if EV_MINIMAL
287# define EV_PID_HASHSIZE 1
288# else
289# define EV_PID_HASHSIZE 16
290# endif
291#endif
292
293#ifndef EV_INOTIFY_HASHSIZE
294# if EV_MINIMAL
295# define EV_INOTIFY_HASHSIZE 1
296# else
297# define EV_INOTIFY_HASHSIZE 16
298# endif
299#endif
300
301#ifndef EV_USE_EVENTFD
302# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
303# define EV_USE_EVENTFD 1
304# else
305# define EV_USE_EVENTFD 0
306# endif
307#endif
308
309#ifndef EV_USE_SIGNALFD
310# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
311# define EV_USE_SIGNALFD 1
312# else
313# define EV_USE_SIGNALFD 0
314# endif
315#endif
316
317#if 0 /* debugging */
318# define EV_VERIFY 3
319# define EV_USE_4HEAP 1
320# define EV_HEAP_CACHE_AT 1
321#endif
322
323#ifndef EV_VERIFY
324# define EV_VERIFY !EV_MINIMAL
325#endif
326
327#ifndef EV_USE_4HEAP
328# define EV_USE_4HEAP !EV_MINIMAL
329#endif
330
331#ifndef EV_HEAP_CACHE_AT
332# define EV_HEAP_CACHE_AT !EV_MINIMAL
333#endif
334
335/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
336/* which makes programs even slower. might work on other unices, too. */
337#if EV_USE_CLOCK_SYSCALL
338# include <syscall.h>
339# ifdef SYS_clock_gettime
340# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
341# undef EV_USE_MONOTONIC
342# define EV_USE_MONOTONIC 1
343# else
344# undef EV_USE_CLOCK_SYSCALL
345# define EV_USE_CLOCK_SYSCALL 0
346# endif
347#endif
348
349/* this block fixes any misconfiguration where we know we run into trouble otherwise */
350
351#ifdef _AIX
352/* AIX has a completely broken poll.h header */
353# undef EV_USE_POLL
354# define EV_USE_POLL 0
355#endif
356
45# ifdef CLOCK_MONOTONIC 357#ifndef CLOCK_MONOTONIC
358# undef EV_USE_MONOTONIC
46# define HAVE_MONOTONIC 1 359# define EV_USE_MONOTONIC 0
360#endif
361
362#ifndef CLOCK_REALTIME
363# undef EV_USE_REALTIME
364# define EV_USE_REALTIME 0
365#endif
366
367#if !EV_STAT_ENABLE
368# undef EV_USE_INOTIFY
369# define EV_USE_INOTIFY 0
370#endif
371
372#if !EV_USE_NANOSLEEP
373# ifndef _WIN32
374# include <sys/select.h>
375# endif
376#endif
377
378#if EV_USE_INOTIFY
379# include <sys/utsname.h>
380# include <sys/statfs.h>
381# include <sys/inotify.h>
382/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
383# ifndef IN_DONT_FOLLOW
384# undef EV_USE_INOTIFY
385# define EV_USE_INOTIFY 0
386# endif
387#endif
388
389#if EV_SELECT_IS_WINSOCKET
390# include <winsock.h>
391#endif
392
393#if EV_USE_EVENTFD
394/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
395# include <stdint.h>
396# ifndef EFD_NONBLOCK
397# define EFD_NONBLOCK O_NONBLOCK
398# endif
399# ifndef EFD_CLOEXEC
400# ifdef O_CLOEXEC
401# define EFD_CLOEXEC O_CLOEXEC
402# else
403# define EFD_CLOEXEC 02000000
47# endif 404# endif
48#endif 405# endif
49 406# ifdef __cplusplus
50#ifndef HAVE_SELECT 407extern "C" {
51# define HAVE_SELECT 1
52#endif 408# endif
53 409int (eventfd) (unsigned int initval, int flags);
54#ifndef HAVE_EPOLL 410# ifdef __cplusplus
55# define HAVE_EPOLL 0 411}
56#endif 412# endif
413#endif
57 414
58#ifndef HAVE_REALTIME 415#if EV_USE_SIGNALFD
59# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ 416/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
417# include <stdint.h>
418# ifndef SFD_NONBLOCK
419# define SFD_NONBLOCK O_NONBLOCK
60#endif 420# endif
421# ifndef SFD_CLOEXEC
422# ifdef O_CLOEXEC
423# define SFD_CLOEXEC O_CLOEXEC
424# else
425# define SFD_CLOEXEC 02000000
426# endif
427# endif
428# ifdef __cplusplus
429extern "C" {
430# endif
431int signalfd (int fd, const sigset_t *mask, int flags);
432
433struct signalfd_siginfo
434{
435 uint32_t ssi_signo;
436 char pad[128 - sizeof (uint32_t)];
437};
438# ifdef __cplusplus
439}
440# endif
441#endif
442
443
444/**/
445
446#if EV_VERIFY >= 3
447# define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
448#else
449# define EV_FREQUENT_CHECK do { } while (0)
450#endif
451
452/*
453 * This is used to avoid floating point rounding problems.
454 * It is added to ev_rt_now when scheduling periodics
455 * to ensure progress, time-wise, even when rounding
456 * errors are against us.
457 * This value is good at least till the year 4000.
458 * Better solutions welcome.
459 */
460#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
61 461
62#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 462#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
63#define MAX_BLOCKTIME 60. 463#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
64 464
65#include "ev.h" 465#if __GNUC__ >= 4
466# define expect(expr,value) __builtin_expect ((expr),(value))
467# define noinline __attribute__ ((noinline))
468#else
469# define expect(expr,value) (expr)
470# define noinline
471# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
472# define inline
473# endif
474#endif
66 475
476#define expect_false(expr) expect ((expr) != 0, 0)
477#define expect_true(expr) expect ((expr) != 0, 1)
478#define inline_size static inline
479
480#if EV_MINIMAL
481# define inline_speed static noinline
482#else
483# define inline_speed static inline
484#endif
485
486#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
487
488#if EV_MINPRI == EV_MAXPRI
489# define ABSPRI(w) (((W)w), 0)
490#else
491# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
492#endif
493
494#define EMPTY /* required for microsofts broken pseudo-c compiler */
495#define EMPTY2(a,b) /* used to suppress some warnings */
496
67typedef struct ev_watcher *W; 497typedef ev_watcher *W;
68typedef struct ev_watcher_list *WL; 498typedef ev_watcher_list *WL;
69typedef struct ev_watcher_time *WT; 499typedef ev_watcher_time *WT;
70 500
71static ev_tstamp now, diff; /* monotonic clock */ 501#define ev_active(w) ((W)(w))->active
72ev_tstamp ev_now; 502#define ev_at(w) ((WT)(w))->at
73int ev_method;
74 503
75static int have_monotonic; /* runtime */ 504#if EV_USE_REALTIME
505/* sig_atomic_t is used to avoid per-thread variables or locking but still */
506/* giving it a reasonably high chance of working on typical architetcures */
507static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
508#endif
76 509
77static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 510#if EV_USE_MONOTONIC
78static void (*method_modify)(int fd, int oev, int nev); 511static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
79static void (*method_poll)(ev_tstamp timeout); 512#endif
513
514#ifndef EV_FD_TO_WIN32_HANDLE
515# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
516#endif
517#ifndef EV_WIN32_HANDLE_TO_FD
518# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
519#endif
520#ifndef EV_WIN32_CLOSE_FD
521# define EV_WIN32_CLOSE_FD(fd) close (fd)
522#endif
523
524#ifdef _WIN32
525# include "ev_win32.c"
526#endif
80 527
81/*****************************************************************************/ 528/*****************************************************************************/
82 529
530#if EV_AVOID_STDIO
531static void noinline
532ev_printerr (const char *msg)
533{
534 write (STDERR_FILENO, msg, strlen (msg));
535}
536#endif
537
538static void (*syserr_cb)(const char *msg);
539
540void
541ev_set_syserr_cb (void (*cb)(const char *msg))
542{
543 syserr_cb = cb;
544}
545
546static void noinline
547ev_syserr (const char *msg)
548{
549 if (!msg)
550 msg = "(libev) system error";
551
552 if (syserr_cb)
553 syserr_cb (msg);
554 else
555 {
556#if EV_AVOID_STDIO
557 const char *err = strerror (errno);
558
559 ev_printerr (msg);
560 ev_printerr (": ");
561 ev_printerr (err);
562 ev_printerr ("\n");
563#else
564 perror (msg);
565#endif
566 abort ();
567 }
568}
569
570static void *
571ev_realloc_emul (void *ptr, long size)
572{
573 /* some systems, notably openbsd and darwin, fail to properly
574 * implement realloc (x, 0) (as required by both ansi c-98 and
575 * the single unix specification, so work around them here.
576 */
577
578 if (size)
579 return realloc (ptr, size);
580
581 free (ptr);
582 return 0;
583}
584
585static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
586
587void
588ev_set_allocator (void *(*cb)(void *ptr, long size))
589{
590 alloc = cb;
591}
592
593inline_speed void *
594ev_realloc (void *ptr, long size)
595{
596 ptr = alloc (ptr, size);
597
598 if (!ptr && size)
599 {
600#if EV_AVOID_STDIO
601 ev_printerr ("libev: memory allocation failed, aborting.\n");
602#else
603 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
604#endif
605 abort ();
606 }
607
608 return ptr;
609}
610
611#define ev_malloc(size) ev_realloc (0, (size))
612#define ev_free(ptr) ev_realloc ((ptr), 0)
613
614/*****************************************************************************/
615
616/* set in reify when reification needed */
617#define EV_ANFD_REIFY 1
618
619/* file descriptor info structure */
620typedef struct
621{
622 WL head;
623 unsigned char events; /* the events watched for */
624 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
625 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
626 unsigned char unused;
627#if EV_USE_EPOLL
628 unsigned int egen; /* generation counter to counter epoll bugs */
629#endif
630#if EV_SELECT_IS_WINSOCKET
631 SOCKET handle;
632#endif
633} ANFD;
634
635/* stores the pending event set for a given watcher */
636typedef struct
637{
638 W w;
639 int events; /* the pending event set for the given watcher */
640} ANPENDING;
641
642#if EV_USE_INOTIFY
643/* hash table entry per inotify-id */
644typedef struct
645{
646 WL head;
647} ANFS;
648#endif
649
650/* Heap Entry */
651#if EV_HEAP_CACHE_AT
652 /* a heap element */
653 typedef struct {
654 ev_tstamp at;
655 WT w;
656 } ANHE;
657
658 #define ANHE_w(he) (he).w /* access watcher, read-write */
659 #define ANHE_at(he) (he).at /* access cached at, read-only */
660 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
661#else
662 /* a heap element */
663 typedef WT ANHE;
664
665 #define ANHE_w(he) (he)
666 #define ANHE_at(he) (he)->at
667 #define ANHE_at_cache(he)
668#endif
669
670#if EV_MULTIPLICITY
671
672 struct ev_loop
673 {
674 ev_tstamp ev_rt_now;
675 #define ev_rt_now ((loop)->ev_rt_now)
676 #define VAR(name,decl) decl;
677 #include "ev_vars.h"
678 #undef VAR
679 };
680 #include "ev_wrap.h"
681
682 static struct ev_loop default_loop_struct;
683 struct ev_loop *ev_default_loop_ptr;
684
685#else
686
687 ev_tstamp ev_rt_now;
688 #define VAR(name,decl) static decl;
689 #include "ev_vars.h"
690 #undef VAR
691
692 static int ev_default_loop_ptr;
693
694#endif
695
696#if EV_MINIMAL < 2
697# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
698# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
699# define EV_INVOKE_PENDING invoke_cb (EV_A)
700#else
701# define EV_RELEASE_CB (void)0
702# define EV_ACQUIRE_CB (void)0
703# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
704#endif
705
706#define EVUNLOOP_RECURSE 0x80
707
708/*****************************************************************************/
709
710#ifndef EV_HAVE_EV_TIME
83ev_tstamp 711ev_tstamp
84ev_time (void) 712ev_time (void)
85{ 713{
86#if HAVE_REALTIME 714#if EV_USE_REALTIME
715 if (expect_true (have_realtime))
716 {
87 struct timespec ts; 717 struct timespec ts;
88 clock_gettime (CLOCK_REALTIME, &ts); 718 clock_gettime (CLOCK_REALTIME, &ts);
89 return ts.tv_sec + ts.tv_nsec * 1e-9; 719 return ts.tv_sec + ts.tv_nsec * 1e-9;
90#else 720 }
721#endif
722
91 struct timeval tv; 723 struct timeval tv;
92 gettimeofday (&tv, 0); 724 gettimeofday (&tv, 0);
93 return tv.tv_sec + tv.tv_usec * 1e-6; 725 return tv.tv_sec + tv.tv_usec * 1e-6;
94#endif
95} 726}
727#endif
96 728
97static ev_tstamp 729inline_size ev_tstamp
98get_clock (void) 730get_clock (void)
99{ 731{
100#if HAVE_MONOTONIC 732#if EV_USE_MONOTONIC
101 if (have_monotonic) 733 if (expect_true (have_monotonic))
102 { 734 {
103 struct timespec ts; 735 struct timespec ts;
104 clock_gettime (CLOCK_MONOTONIC, &ts); 736 clock_gettime (CLOCK_MONOTONIC, &ts);
105 return ts.tv_sec + ts.tv_nsec * 1e-9; 737 return ts.tv_sec + ts.tv_nsec * 1e-9;
106 } 738 }
107#endif 739#endif
108 740
109 return ev_time (); 741 return ev_time ();
110} 742}
111 743
112#define array_needsize(base,cur,cnt,init) \ 744#if EV_MULTIPLICITY
113 if ((cnt) > cur) \ 745ev_tstamp
114 { \ 746ev_now (EV_P)
115 int newcnt = cur ? cur << 1 : 16; \ 747{
116 base = realloc (base, sizeof (*base) * (newcnt)); \ 748 return ev_rt_now;
117 init (base + cur, newcnt - cur); \ 749}
118 cur = newcnt; \ 750#endif
751
752void
753ev_sleep (ev_tstamp delay)
754{
755 if (delay > 0.)
119 } 756 {
757#if EV_USE_NANOSLEEP
758 struct timespec ts;
759
760 ts.tv_sec = (time_t)delay;
761 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
762
763 nanosleep (&ts, 0);
764#elif defined(_WIN32)
765 Sleep ((unsigned long)(delay * 1e3));
766#else
767 struct timeval tv;
768
769 tv.tv_sec = (time_t)delay;
770 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
771
772 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
773 /* something not guaranteed by newer posix versions, but guaranteed */
774 /* by older ones */
775 select (0, 0, 0, 0, &tv);
776#endif
777 }
778}
120 779
121/*****************************************************************************/ 780/*****************************************************************************/
122 781
123typedef struct 782#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
124{
125 struct ev_io *head;
126 unsigned char wev, rev; /* want, received event set */
127} ANFD;
128 783
129static ANFD *anfds; 784/* find a suitable new size for the given array, */
130static int anfdmax; 785/* hopefully by rounding to a ncie-to-malloc size */
131 786inline_size int
132static int *fdchanges; 787array_nextsize (int elem, int cur, int cnt)
133static int fdchangemax, fdchangecnt;
134
135static void
136anfds_init (ANFD *base, int count)
137{ 788{
138 while (count--) 789 int ncur = cur + 1;
139 { 790
140 base->head = 0; 791 do
141 base->wev = base->rev = EV_NONE; 792 ncur <<= 1;
142 ++base; 793 while (cnt > ncur);
794
795 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
796 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
143 } 797 {
144} 798 ncur *= elem;
145 799 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
146typedef struct 800 ncur = ncur - sizeof (void *) * 4;
147{ 801 ncur /= elem;
148 W w;
149 int events;
150} ANPENDING;
151
152static ANPENDING *pendings;
153static int pendingmax, pendingcnt;
154
155static void
156event (W w, int events)
157{
158 if (w->active)
159 { 802 }
803
804 return ncur;
805}
806
807static noinline void *
808array_realloc (int elem, void *base, int *cur, int cnt)
809{
810 *cur = array_nextsize (elem, *cur, cnt);
811 return ev_realloc (base, elem * *cur);
812}
813
814#define array_init_zero(base,count) \
815 memset ((void *)(base), 0, sizeof (*(base)) * (count))
816
817#define array_needsize(type,base,cur,cnt,init) \
818 if (expect_false ((cnt) > (cur))) \
819 { \
820 int ocur_ = (cur); \
821 (base) = (type *)array_realloc \
822 (sizeof (type), (base), &(cur), (cnt)); \
823 init ((base) + (ocur_), (cur) - ocur_); \
824 }
825
826#if 0
827#define array_slim(type,stem) \
828 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
829 { \
830 stem ## max = array_roundsize (stem ## cnt >> 1); \
831 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
832 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
833 }
834#endif
835
836#define array_free(stem, idx) \
837 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
838
839/*****************************************************************************/
840
841/* dummy callback for pending events */
842static void noinline
843pendingcb (EV_P_ ev_prepare *w, int revents)
844{
845}
846
847void noinline
848ev_feed_event (EV_P_ void *w, int revents)
849{
850 W w_ = (W)w;
851 int pri = ABSPRI (w_);
852
853 if (expect_false (w_->pending))
854 pendings [pri][w_->pending - 1].events |= revents;
855 else
856 {
160 w->pending = ++pendingcnt; 857 w_->pending = ++pendingcnt [pri];
161 array_needsize (pendings, pendingmax, pendingcnt, ); 858 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
162 pendings [pendingcnt - 1].w = w; 859 pendings [pri][w_->pending - 1].w = w_;
163 pendings [pendingcnt - 1].events = events; 860 pendings [pri][w_->pending - 1].events = revents;
164 } 861 }
165} 862}
166 863
167static void 864inline_speed void
865feed_reverse (EV_P_ W w)
866{
867 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
868 rfeeds [rfeedcnt++] = w;
869}
870
871inline_size void
872feed_reverse_done (EV_P_ int revents)
873{
874 do
875 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
876 while (rfeedcnt);
877}
878
879inline_speed void
880queue_events (EV_P_ W *events, int eventcnt, int type)
881{
882 int i;
883
884 for (i = 0; i < eventcnt; ++i)
885 ev_feed_event (EV_A_ events [i], type);
886}
887
888/*****************************************************************************/
889
890inline_speed void
168fd_event (int fd, int events) 891fd_event_nc (EV_P_ int fd, int revents)
169{ 892{
170 ANFD *anfd = anfds + fd; 893 ANFD *anfd = anfds + fd;
171 struct ev_io *w; 894 ev_io *w;
172 895
173 for (w = anfd->head; w; w = w->next) 896 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
174 { 897 {
175 int ev = w->events & events; 898 int ev = w->events & revents;
176 899
177 if (ev) 900 if (ev)
178 event ((W)w, ev); 901 ev_feed_event (EV_A_ (W)w, ev);
179 }
180}
181
182static void
183queue_events (W *events, int eventcnt, int type)
184{
185 int i;
186
187 for (i = 0; i < eventcnt; ++i)
188 event (events [i], type);
189}
190
191/* called on EBADF to verify fds */
192static void
193fd_recheck ()
194{
195 int fd;
196
197 for (fd = 0; fd < anfdmax; ++fd)
198 if (anfds [fd].wev)
199 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
200 while (anfds [fd].head)
201 evio_stop (anfds [fd].head);
202}
203
204/*****************************************************************************/
205
206static struct ev_timer **timers;
207static int timermax, timercnt;
208
209static struct ev_periodic **periodics;
210static int periodicmax, periodiccnt;
211
212static void
213upheap (WT *timers, int k)
214{
215 WT w = timers [k];
216
217 while (k && timers [k >> 1]->at > w->at)
218 {
219 timers [k] = timers [k >> 1];
220 timers [k]->active = k + 1;
221 k >>= 1;
222 }
223
224 timers [k] = w;
225 timers [k]->active = k + 1;
226
227}
228
229static void
230downheap (WT *timers, int N, int k)
231{
232 WT w = timers [k];
233
234 while (k < (N >> 1))
235 {
236 int j = k << 1;
237
238 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
239 ++j;
240
241 if (w->at <= timers [j]->at)
242 break;
243
244 timers [k] = timers [j];
245 timers [k]->active = k + 1;
246 k = j;
247 }
248
249 timers [k] = w;
250 timers [k]->active = k + 1;
251}
252
253/*****************************************************************************/
254
255typedef struct
256{
257 struct ev_signal *head;
258 sig_atomic_t gotsig;
259} ANSIG;
260
261static ANSIG *signals;
262static int signalmax;
263
264static int sigpipe [2];
265static sig_atomic_t gotsig;
266static struct ev_io sigev;
267
268static void
269signals_init (ANSIG *base, int count)
270{
271 while (count--)
272 {
273 base->head = 0;
274 base->gotsig = 0;
275 ++base;
276 }
277}
278
279static void
280sighandler (int signum)
281{
282 signals [signum - 1].gotsig = 1;
283
284 if (!gotsig)
285 {
286 gotsig = 1;
287 write (sigpipe [1], &gotsig, 1);
288 }
289}
290
291static void
292sigcb (struct ev_io *iow, int revents)
293{
294 struct ev_signal *w;
295 int sig;
296
297 gotsig = 0;
298 read (sigpipe [0], &revents, 1);
299
300 for (sig = signalmax; sig--; )
301 if (signals [sig].gotsig)
302 {
303 signals [sig].gotsig = 0;
304
305 for (w = signals [sig].head; w; w = w->next)
306 event ((W)w, EV_SIGNAL);
307 } 902 }
308} 903}
309 904
310static void 905/* do not submit kernel events for fds that have reify set */
311siginit (void) 906/* because that means they changed while we were polling for new events */
907inline_speed void
908fd_event (EV_P_ int fd, int revents)
312{ 909{
313 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); 910 ANFD *anfd = anfds + fd;
314 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
315 911
316 /* rather than sort out wether we really need nb, set it */ 912 if (expect_true (!anfd->reify))
317 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 913 fd_event_nc (EV_A_ fd, revents);
318 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
319
320 evio_set (&sigev, sigpipe [0], EV_READ);
321 evio_start (&sigev);
322} 914}
323 915
324/*****************************************************************************/ 916void
325 917ev_feed_fd_event (EV_P_ int fd, int revents)
326static struct ev_idle **idles;
327static int idlemax, idlecnt;
328
329static struct ev_prepare **prepares;
330static int preparemax, preparecnt;
331
332static struct ev_check **checks;
333static int checkmax, checkcnt;
334
335/*****************************************************************************/
336
337#if HAVE_EPOLL
338# include "ev_epoll.c"
339#endif
340#if HAVE_SELECT
341# include "ev_select.c"
342#endif
343
344int ev_init (int flags)
345{ 918{
346#if HAVE_MONOTONIC 919 if (fd >= 0 && fd < anfdmax)
347 { 920 fd_event_nc (EV_A_ fd, revents);
348 struct timespec ts;
349 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
350 have_monotonic = 1;
351 }
352#endif
353
354 ev_now = ev_time ();
355 now = get_clock ();
356 diff = ev_now - now;
357
358 if (pipe (sigpipe))
359 return 0;
360
361 ev_method = EVMETHOD_NONE;
362#if HAVE_EPOLL
363 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
364#endif
365#if HAVE_SELECT
366 if (ev_method == EVMETHOD_NONE) select_init (flags);
367#endif
368
369 if (ev_method)
370 {
371 evw_init (&sigev, sigcb);
372 siginit ();
373 }
374
375 return ev_method;
376} 921}
377 922
378/*****************************************************************************/ 923/* make sure the external fd watch events are in-sync */
379 924/* with the kernel/libev internal state */
380void ev_prefork (void) 925inline_size void
381{ 926fd_reify (EV_P)
382 /* nop */
383}
384
385void ev_postfork_parent (void)
386{
387 /* nop */
388}
389
390void ev_postfork_child (void)
391{
392#if HAVE_EPOLL
393 if (ev_method == EVMETHOD_EPOLL)
394 epoll_postfork_child ();
395#endif
396
397 evio_stop (&sigev);
398 close (sigpipe [0]);
399 close (sigpipe [1]);
400 pipe (sigpipe);
401 siginit ();
402}
403
404/*****************************************************************************/
405
406static void
407fd_reify (void)
408{ 927{
409 int i; 928 int i;
410 929
411 for (i = 0; i < fdchangecnt; ++i) 930 for (i = 0; i < fdchangecnt; ++i)
412 { 931 {
413 int fd = fdchanges [i]; 932 int fd = fdchanges [i];
414 ANFD *anfd = anfds + fd; 933 ANFD *anfd = anfds + fd;
415 struct ev_io *w; 934 ev_io *w;
416 935
417 int wev = 0; 936 unsigned char events = 0;
418 937
419 for (w = anfd->head; w; w = w->next) 938 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
420 wev |= w->events; 939 events |= (unsigned char)w->events;
421 940
422 if (anfd->wev != wev) 941#if EV_SELECT_IS_WINSOCKET
942 if (events)
423 { 943 {
424 method_modify (fd, anfd->wev, wev); 944 unsigned long arg;
425 anfd->wev = wev; 945 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
946 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
426 } 947 }
948#endif
949
950 {
951 unsigned char o_events = anfd->events;
952 unsigned char o_reify = anfd->reify;
953
954 anfd->reify = 0;
955 anfd->events = events;
956
957 if (o_events != events || o_reify & EV__IOFDSET)
958 backend_modify (EV_A_ fd, o_events, events);
959 }
427 } 960 }
428 961
429 fdchangecnt = 0; 962 fdchangecnt = 0;
430} 963}
431 964
965/* something about the given fd changed */
966inline_size void
967fd_change (EV_P_ int fd, int flags)
968{
969 unsigned char reify = anfds [fd].reify;
970 anfds [fd].reify |= flags;
971
972 if (expect_true (!reify))
973 {
974 ++fdchangecnt;
975 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
976 fdchanges [fdchangecnt - 1] = fd;
977 }
978}
979
980/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
981inline_speed void
982fd_kill (EV_P_ int fd)
983{
984 ev_io *w;
985
986 while ((w = (ev_io *)anfds [fd].head))
987 {
988 ev_io_stop (EV_A_ w);
989 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
990 }
991}
992
993/* check whether the given fd is atcually valid, for error recovery */
994inline_size int
995fd_valid (int fd)
996{
997#ifdef _WIN32
998 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
999#else
1000 return fcntl (fd, F_GETFD) != -1;
1001#endif
1002}
1003
1004/* called on EBADF to verify fds */
1005static void noinline
1006fd_ebadf (EV_P)
1007{
1008 int fd;
1009
1010 for (fd = 0; fd < anfdmax; ++fd)
1011 if (anfds [fd].events)
1012 if (!fd_valid (fd) && errno == EBADF)
1013 fd_kill (EV_A_ fd);
1014}
1015
1016/* called on ENOMEM in select/poll to kill some fds and retry */
1017static void noinline
1018fd_enomem (EV_P)
1019{
1020 int fd;
1021
1022 for (fd = anfdmax; fd--; )
1023 if (anfds [fd].events)
1024 {
1025 fd_kill (EV_A_ fd);
1026 break;
1027 }
1028}
1029
1030/* usually called after fork if backend needs to re-arm all fds from scratch */
1031static void noinline
1032fd_rearm_all (EV_P)
1033{
1034 int fd;
1035
1036 for (fd = 0; fd < anfdmax; ++fd)
1037 if (anfds [fd].events)
1038 {
1039 anfds [fd].events = 0;
1040 anfds [fd].emask = 0;
1041 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1042 }
1043}
1044
1045/*****************************************************************************/
1046
1047/*
1048 * the heap functions want a real array index. array index 0 uis guaranteed to not
1049 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1050 * the branching factor of the d-tree.
1051 */
1052
1053/*
1054 * at the moment we allow libev the luxury of two heaps,
1055 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1056 * which is more cache-efficient.
1057 * the difference is about 5% with 50000+ watchers.
1058 */
1059#if EV_USE_4HEAP
1060
1061#define DHEAP 4
1062#define HEAP0 (DHEAP - 1) /* index of first element in heap */
1063#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1064#define UPHEAP_DONE(p,k) ((p) == (k))
1065
1066/* away from the root */
1067inline_speed void
1068downheap (ANHE *heap, int N, int k)
1069{
1070 ANHE he = heap [k];
1071 ANHE *E = heap + N + HEAP0;
1072
1073 for (;;)
1074 {
1075 ev_tstamp minat;
1076 ANHE *minpos;
1077 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1078
1079 /* find minimum child */
1080 if (expect_true (pos + DHEAP - 1 < E))
1081 {
1082 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1083 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1084 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1085 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1086 }
1087 else if (pos < E)
1088 {
1089 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1090 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1091 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1092 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1093 }
1094 else
1095 break;
1096
1097 if (ANHE_at (he) <= minat)
1098 break;
1099
1100 heap [k] = *minpos;
1101 ev_active (ANHE_w (*minpos)) = k;
1102
1103 k = minpos - heap;
1104 }
1105
1106 heap [k] = he;
1107 ev_active (ANHE_w (he)) = k;
1108}
1109
1110#else /* 4HEAP */
1111
1112#define HEAP0 1
1113#define HPARENT(k) ((k) >> 1)
1114#define UPHEAP_DONE(p,k) (!(p))
1115
1116/* away from the root */
1117inline_speed void
1118downheap (ANHE *heap, int N, int k)
1119{
1120 ANHE he = heap [k];
1121
1122 for (;;)
1123 {
1124 int c = k << 1;
1125
1126 if (c >= N + HEAP0)
1127 break;
1128
1129 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1130 ? 1 : 0;
1131
1132 if (ANHE_at (he) <= ANHE_at (heap [c]))
1133 break;
1134
1135 heap [k] = heap [c];
1136 ev_active (ANHE_w (heap [k])) = k;
1137
1138 k = c;
1139 }
1140
1141 heap [k] = he;
1142 ev_active (ANHE_w (he)) = k;
1143}
1144#endif
1145
1146/* towards the root */
1147inline_speed void
1148upheap (ANHE *heap, int k)
1149{
1150 ANHE he = heap [k];
1151
1152 for (;;)
1153 {
1154 int p = HPARENT (k);
1155
1156 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1157 break;
1158
1159 heap [k] = heap [p];
1160 ev_active (ANHE_w (heap [k])) = k;
1161 k = p;
1162 }
1163
1164 heap [k] = he;
1165 ev_active (ANHE_w (he)) = k;
1166}
1167
1168/* move an element suitably so it is in a correct place */
1169inline_size void
1170adjustheap (ANHE *heap, int N, int k)
1171{
1172 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1173 upheap (heap, k);
1174 else
1175 downheap (heap, N, k);
1176}
1177
1178/* rebuild the heap: this function is used only once and executed rarely */
1179inline_size void
1180reheap (ANHE *heap, int N)
1181{
1182 int i;
1183
1184 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1185 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1186 for (i = 0; i < N; ++i)
1187 upheap (heap, i + HEAP0);
1188}
1189
1190/*****************************************************************************/
1191
1192/* associate signal watchers to a signal signal */
1193typedef struct
1194{
1195 EV_ATOMIC_T pending;
1196#if EV_MULTIPLICITY
1197 EV_P;
1198#endif
1199 WL head;
1200} ANSIG;
1201
1202static ANSIG signals [EV_NSIG - 1];
1203
1204/*****************************************************************************/
1205
1206/* used to prepare libev internal fd's */
1207/* this is not fork-safe */
1208inline_speed void
1209fd_intern (int fd)
1210{
1211#ifdef _WIN32
1212 unsigned long arg = 1;
1213 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1214#else
1215 fcntl (fd, F_SETFD, FD_CLOEXEC);
1216 fcntl (fd, F_SETFL, O_NONBLOCK);
1217#endif
1218}
1219
1220static void noinline
1221evpipe_init (EV_P)
1222{
1223 if (!ev_is_active (&pipe_w))
1224 {
1225#if EV_USE_EVENTFD
1226 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1227 if (evfd < 0 && errno == EINVAL)
1228 evfd = eventfd (0, 0);
1229
1230 if (evfd >= 0)
1231 {
1232 evpipe [0] = -1;
1233 fd_intern (evfd); /* doing it twice doesn't hurt */
1234 ev_io_set (&pipe_w, evfd, EV_READ);
1235 }
1236 else
1237#endif
1238 {
1239 while (pipe (evpipe))
1240 ev_syserr ("(libev) error creating signal/async pipe");
1241
1242 fd_intern (evpipe [0]);
1243 fd_intern (evpipe [1]);
1244 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1245 }
1246
1247 ev_io_start (EV_A_ &pipe_w);
1248 ev_unref (EV_A); /* watcher should not keep loop alive */
1249 }
1250}
1251
1252inline_size void
1253evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1254{
1255 if (!*flag)
1256 {
1257 int old_errno = errno; /* save errno because write might clobber it */
1258
1259 *flag = 1;
1260
1261#if EV_USE_EVENTFD
1262 if (evfd >= 0)
1263 {
1264 uint64_t counter = 1;
1265 write (evfd, &counter, sizeof (uint64_t));
1266 }
1267 else
1268#endif
1269 write (evpipe [1], &old_errno, 1);
1270
1271 errno = old_errno;
1272 }
1273}
1274
1275/* called whenever the libev signal pipe */
1276/* got some events (signal, async) */
432static void 1277static void
433call_pending () 1278pipecb (EV_P_ ev_io *iow, int revents)
434{ 1279{
435 while (pendingcnt) 1280 int i;
1281
1282#if EV_USE_EVENTFD
1283 if (evfd >= 0)
1284 {
1285 uint64_t counter;
1286 read (evfd, &counter, sizeof (uint64_t));
436 { 1287 }
437 ANPENDING *p = pendings + --pendingcnt; 1288 else
1289#endif
1290 {
1291 char dummy;
1292 read (evpipe [0], &dummy, 1);
1293 }
438 1294
439 if (p->w) 1295 if (sig_pending)
1296 {
1297 sig_pending = 0;
1298
1299 for (i = EV_NSIG - 1; i--; )
1300 if (expect_false (signals [i].pending))
1301 ev_feed_signal_event (EV_A_ i + 1);
1302 }
1303
1304#if EV_ASYNC_ENABLE
1305 if (async_pending)
1306 {
1307 async_pending = 0;
1308
1309 for (i = asynccnt; i--; )
1310 if (asyncs [i]->sent)
1311 {
1312 asyncs [i]->sent = 0;
1313 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1314 }
1315 }
1316#endif
1317}
1318
1319/*****************************************************************************/
1320
1321static void
1322ev_sighandler (int signum)
1323{
1324#if EV_MULTIPLICITY
1325 EV_P = signals [signum - 1].loop;
1326#endif
1327
1328#ifdef _WIN32
1329 signal (signum, ev_sighandler);
1330#endif
1331
1332 signals [signum - 1].pending = 1;
1333 evpipe_write (EV_A_ &sig_pending);
1334}
1335
1336void noinline
1337ev_feed_signal_event (EV_P_ int signum)
1338{
1339 WL w;
1340
1341 if (expect_false (signum <= 0 || signum > EV_NSIG))
1342 return;
1343
1344 --signum;
1345
1346#if EV_MULTIPLICITY
1347 /* it is permissible to try to feed a signal to the wrong loop */
1348 /* or, likely more useful, feeding a signal nobody is waiting for */
1349
1350 if (expect_false (signals [signum].loop != EV_A))
1351 return;
1352#endif
1353
1354 signals [signum].pending = 0;
1355
1356 for (w = signals [signum].head; w; w = w->next)
1357 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1358}
1359
1360#if EV_USE_SIGNALFD
1361static void
1362sigfdcb (EV_P_ ev_io *iow, int revents)
1363{
1364 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1365
1366 for (;;)
1367 {
1368 ssize_t res = read (sigfd, si, sizeof (si));
1369
1370 /* not ISO-C, as res might be -1, but works with SuS */
1371 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1372 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1373
1374 if (res < (ssize_t)sizeof (si))
1375 break;
1376 }
1377}
1378#endif
1379
1380/*****************************************************************************/
1381
1382static WL childs [EV_PID_HASHSIZE];
1383
1384#ifndef _WIN32
1385
1386static ev_signal childev;
1387
1388#ifndef WIFCONTINUED
1389# define WIFCONTINUED(status) 0
1390#endif
1391
1392/* handle a single child status event */
1393inline_speed void
1394child_reap (EV_P_ int chain, int pid, int status)
1395{
1396 ev_child *w;
1397 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1398
1399 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1400 {
1401 if ((w->pid == pid || !w->pid)
1402 && (!traced || (w->flags & 1)))
440 { 1403 {
441 p->w->pending = 0; 1404 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
442 p->w->cb (p->w, p->events); 1405 w->rpid = pid;
1406 w->rstatus = status;
1407 ev_feed_event (EV_A_ (W)w, EV_CHILD);
443 } 1408 }
444 } 1409 }
445} 1410}
446 1411
1412#ifndef WCONTINUED
1413# define WCONTINUED 0
1414#endif
1415
1416/* called on sigchld etc., calls waitpid */
447static void 1417static void
1418childcb (EV_P_ ev_signal *sw, int revents)
1419{
1420 int pid, status;
1421
1422 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1423 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1424 if (!WCONTINUED
1425 || errno != EINVAL
1426 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1427 return;
1428
1429 /* make sure we are called again until all children have been reaped */
1430 /* we need to do it this way so that the callback gets called before we continue */
1431 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1432
1433 child_reap (EV_A_ pid, pid, status);
1434 if (EV_PID_HASHSIZE > 1)
1435 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1436}
1437
1438#endif
1439
1440/*****************************************************************************/
1441
1442#if EV_USE_PORT
1443# include "ev_port.c"
1444#endif
1445#if EV_USE_KQUEUE
1446# include "ev_kqueue.c"
1447#endif
1448#if EV_USE_EPOLL
1449# include "ev_epoll.c"
1450#endif
1451#if EV_USE_POLL
1452# include "ev_poll.c"
1453#endif
1454#if EV_USE_SELECT
1455# include "ev_select.c"
1456#endif
1457
1458int
1459ev_version_major (void)
1460{
1461 return EV_VERSION_MAJOR;
1462}
1463
1464int
1465ev_version_minor (void)
1466{
1467 return EV_VERSION_MINOR;
1468}
1469
1470/* return true if we are running with elevated privileges and should ignore env variables */
1471int inline_size
1472enable_secure (void)
1473{
1474#ifdef _WIN32
1475 return 0;
1476#else
1477 return getuid () != geteuid ()
1478 || getgid () != getegid ();
1479#endif
1480}
1481
1482unsigned int
1483ev_supported_backends (void)
1484{
1485 unsigned int flags = 0;
1486
1487 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1488 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1489 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1490 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1491 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1492
1493 return flags;
1494}
1495
1496unsigned int
1497ev_recommended_backends (void)
1498{
1499 unsigned int flags = ev_supported_backends ();
1500
1501#ifndef __NetBSD__
1502 /* kqueue is borked on everything but netbsd apparently */
1503 /* it usually doesn't work correctly on anything but sockets and pipes */
1504 flags &= ~EVBACKEND_KQUEUE;
1505#endif
1506#ifdef __APPLE__
1507 /* only select works correctly on that "unix-certified" platform */
1508 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1509 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1510#endif
1511
1512 return flags;
1513}
1514
1515unsigned int
1516ev_embeddable_backends (void)
1517{
1518 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1519
1520 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1521 /* please fix it and tell me how to detect the fix */
1522 flags &= ~EVBACKEND_EPOLL;
1523
1524 return flags;
1525}
1526
1527unsigned int
1528ev_backend (EV_P)
1529{
1530 return backend;
1531}
1532
1533#if EV_MINIMAL < 2
1534unsigned int
1535ev_loop_count (EV_P)
1536{
1537 return loop_count;
1538}
1539
1540unsigned int
1541ev_loop_depth (EV_P)
1542{
1543 return loop_depth;
1544}
1545
1546void
1547ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1548{
1549 io_blocktime = interval;
1550}
1551
1552void
1553ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1554{
1555 timeout_blocktime = interval;
1556}
1557
1558void
1559ev_set_userdata (EV_P_ void *data)
1560{
1561 userdata = data;
1562}
1563
1564void *
1565ev_userdata (EV_P)
1566{
1567 return userdata;
1568}
1569
1570void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1571{
1572 invoke_cb = invoke_pending_cb;
1573}
1574
1575void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1576{
1577 release_cb = release;
1578 acquire_cb = acquire;
1579}
1580#endif
1581
1582/* initialise a loop structure, must be zero-initialised */
1583static void noinline
1584loop_init (EV_P_ unsigned int flags)
1585{
1586 if (!backend)
1587 {
1588#if EV_USE_REALTIME
1589 if (!have_realtime)
1590 {
1591 struct timespec ts;
1592
1593 if (!clock_gettime (CLOCK_REALTIME, &ts))
1594 have_realtime = 1;
1595 }
1596#endif
1597
1598#if EV_USE_MONOTONIC
1599 if (!have_monotonic)
1600 {
1601 struct timespec ts;
1602
1603 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1604 have_monotonic = 1;
1605 }
1606#endif
1607
1608 /* pid check not overridable via env */
1609#ifndef _WIN32
1610 if (flags & EVFLAG_FORKCHECK)
1611 curpid = getpid ();
1612#endif
1613
1614 if (!(flags & EVFLAG_NOENV)
1615 && !enable_secure ()
1616 && getenv ("LIBEV_FLAGS"))
1617 flags = atoi (getenv ("LIBEV_FLAGS"));
1618
1619 ev_rt_now = ev_time ();
1620 mn_now = get_clock ();
1621 now_floor = mn_now;
1622 rtmn_diff = ev_rt_now - mn_now;
1623#if EV_MINIMAL < 2
1624 invoke_cb = ev_invoke_pending;
1625#endif
1626
1627 io_blocktime = 0.;
1628 timeout_blocktime = 0.;
1629 backend = 0;
1630 backend_fd = -1;
1631 sig_pending = 0;
1632#if EV_ASYNC_ENABLE
1633 async_pending = 0;
1634#endif
1635#if EV_USE_INOTIFY
1636 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1637#endif
1638#if EV_USE_SIGNALFD
1639 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1640#endif
1641
1642 if (!(flags & 0x0000ffffU))
1643 flags |= ev_recommended_backends ();
1644
1645#if EV_USE_PORT
1646 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1647#endif
1648#if EV_USE_KQUEUE
1649 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1650#endif
1651#if EV_USE_EPOLL
1652 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1653#endif
1654#if EV_USE_POLL
1655 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1656#endif
1657#if EV_USE_SELECT
1658 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1659#endif
1660
1661 ev_prepare_init (&pending_w, pendingcb);
1662
1663 ev_init (&pipe_w, pipecb);
1664 ev_set_priority (&pipe_w, EV_MAXPRI);
1665 }
1666}
1667
1668/* free up a loop structure */
1669static void noinline
1670loop_destroy (EV_P)
1671{
1672 int i;
1673
1674 if (ev_is_active (&pipe_w))
1675 {
1676 /*ev_ref (EV_A);*/
1677 /*ev_io_stop (EV_A_ &pipe_w);*/
1678
1679#if EV_USE_EVENTFD
1680 if (evfd >= 0)
1681 close (evfd);
1682#endif
1683
1684 if (evpipe [0] >= 0)
1685 {
1686 EV_WIN32_CLOSE_FD (evpipe [0]);
1687 EV_WIN32_CLOSE_FD (evpipe [1]);
1688 }
1689 }
1690
1691#if EV_USE_SIGNALFD
1692 if (ev_is_active (&sigfd_w))
1693 close (sigfd);
1694#endif
1695
1696#if EV_USE_INOTIFY
1697 if (fs_fd >= 0)
1698 close (fs_fd);
1699#endif
1700
1701 if (backend_fd >= 0)
1702 close (backend_fd);
1703
1704#if EV_USE_PORT
1705 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1706#endif
1707#if EV_USE_KQUEUE
1708 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1709#endif
1710#if EV_USE_EPOLL
1711 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1712#endif
1713#if EV_USE_POLL
1714 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1715#endif
1716#if EV_USE_SELECT
1717 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1718#endif
1719
1720 for (i = NUMPRI; i--; )
1721 {
1722 array_free (pending, [i]);
1723#if EV_IDLE_ENABLE
1724 array_free (idle, [i]);
1725#endif
1726 }
1727
1728 ev_free (anfds); anfds = 0; anfdmax = 0;
1729
1730 /* have to use the microsoft-never-gets-it-right macro */
1731 array_free (rfeed, EMPTY);
1732 array_free (fdchange, EMPTY);
1733 array_free (timer, EMPTY);
1734#if EV_PERIODIC_ENABLE
1735 array_free (periodic, EMPTY);
1736#endif
1737#if EV_FORK_ENABLE
1738 array_free (fork, EMPTY);
1739#endif
1740 array_free (prepare, EMPTY);
1741 array_free (check, EMPTY);
1742#if EV_ASYNC_ENABLE
1743 array_free (async, EMPTY);
1744#endif
1745
1746 backend = 0;
1747}
1748
1749#if EV_USE_INOTIFY
1750inline_size void infy_fork (EV_P);
1751#endif
1752
1753inline_size void
1754loop_fork (EV_P)
1755{
1756#if EV_USE_PORT
1757 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1758#endif
1759#if EV_USE_KQUEUE
1760 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1761#endif
1762#if EV_USE_EPOLL
1763 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1764#endif
1765#if EV_USE_INOTIFY
1766 infy_fork (EV_A);
1767#endif
1768
1769 if (ev_is_active (&pipe_w))
1770 {
1771 /* this "locks" the handlers against writing to the pipe */
1772 /* while we modify the fd vars */
1773 sig_pending = 1;
1774#if EV_ASYNC_ENABLE
1775 async_pending = 1;
1776#endif
1777
1778 ev_ref (EV_A);
1779 ev_io_stop (EV_A_ &pipe_w);
1780
1781#if EV_USE_EVENTFD
1782 if (evfd >= 0)
1783 close (evfd);
1784#endif
1785
1786 if (evpipe [0] >= 0)
1787 {
1788 EV_WIN32_CLOSE_FD (evpipe [0]);
1789 EV_WIN32_CLOSE_FD (evpipe [1]);
1790 }
1791
1792 evpipe_init (EV_A);
1793 /* now iterate over everything, in case we missed something */
1794 pipecb (EV_A_ &pipe_w, EV_READ);
1795 }
1796
1797 postfork = 0;
1798}
1799
1800#if EV_MULTIPLICITY
1801
1802struct ev_loop *
1803ev_loop_new (unsigned int flags)
1804{
1805 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1806
1807 memset (EV_A, 0, sizeof (struct ev_loop));
1808 loop_init (EV_A_ flags);
1809
1810 if (ev_backend (EV_A))
1811 return EV_A;
1812
1813 return 0;
1814}
1815
1816void
1817ev_loop_destroy (EV_P)
1818{
1819 loop_destroy (EV_A);
1820 ev_free (loop);
1821}
1822
1823void
1824ev_loop_fork (EV_P)
1825{
1826 postfork = 1; /* must be in line with ev_default_fork */
1827}
1828#endif /* multiplicity */
1829
1830#if EV_VERIFY
1831static void noinline
1832verify_watcher (EV_P_ W w)
1833{
1834 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1835
1836 if (w->pending)
1837 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1838}
1839
1840static void noinline
1841verify_heap (EV_P_ ANHE *heap, int N)
1842{
1843 int i;
1844
1845 for (i = HEAP0; i < N + HEAP0; ++i)
1846 {
1847 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1848 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1849 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1850
1851 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1852 }
1853}
1854
1855static void noinline
1856array_verify (EV_P_ W *ws, int cnt)
1857{
1858 while (cnt--)
1859 {
1860 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1861 verify_watcher (EV_A_ ws [cnt]);
1862 }
1863}
1864#endif
1865
1866#if EV_MINIMAL < 2
1867void
1868ev_loop_verify (EV_P)
1869{
1870#if EV_VERIFY
1871 int i;
1872 WL w;
1873
1874 assert (activecnt >= -1);
1875
1876 assert (fdchangemax >= fdchangecnt);
1877 for (i = 0; i < fdchangecnt; ++i)
1878 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1879
1880 assert (anfdmax >= 0);
1881 for (i = 0; i < anfdmax; ++i)
1882 for (w = anfds [i].head; w; w = w->next)
1883 {
1884 verify_watcher (EV_A_ (W)w);
1885 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
1886 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1887 }
1888
1889 assert (timermax >= timercnt);
1890 verify_heap (EV_A_ timers, timercnt);
1891
1892#if EV_PERIODIC_ENABLE
1893 assert (periodicmax >= periodiccnt);
1894 verify_heap (EV_A_ periodics, periodiccnt);
1895#endif
1896
1897 for (i = NUMPRI; i--; )
1898 {
1899 assert (pendingmax [i] >= pendingcnt [i]);
1900#if EV_IDLE_ENABLE
1901 assert (idleall >= 0);
1902 assert (idlemax [i] >= idlecnt [i]);
1903 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1904#endif
1905 }
1906
1907#if EV_FORK_ENABLE
1908 assert (forkmax >= forkcnt);
1909 array_verify (EV_A_ (W *)forks, forkcnt);
1910#endif
1911
1912#if EV_ASYNC_ENABLE
1913 assert (asyncmax >= asynccnt);
1914 array_verify (EV_A_ (W *)asyncs, asynccnt);
1915#endif
1916
1917 assert (preparemax >= preparecnt);
1918 array_verify (EV_A_ (W *)prepares, preparecnt);
1919
1920 assert (checkmax >= checkcnt);
1921 array_verify (EV_A_ (W *)checks, checkcnt);
1922
1923# if 0
1924 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1925 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
1926# endif
1927#endif
1928}
1929#endif
1930
1931#if EV_MULTIPLICITY
1932struct ev_loop *
1933ev_default_loop_init (unsigned int flags)
1934#else
1935int
1936ev_default_loop (unsigned int flags)
1937#endif
1938{
1939 if (!ev_default_loop_ptr)
1940 {
1941#if EV_MULTIPLICITY
1942 EV_P = ev_default_loop_ptr = &default_loop_struct;
1943#else
1944 ev_default_loop_ptr = 1;
1945#endif
1946
1947 loop_init (EV_A_ flags);
1948
1949 if (ev_backend (EV_A))
1950 {
1951#ifndef _WIN32
1952 ev_signal_init (&childev, childcb, SIGCHLD);
1953 ev_set_priority (&childev, EV_MAXPRI);
1954 ev_signal_start (EV_A_ &childev);
1955 ev_unref (EV_A); /* child watcher should not keep loop alive */
1956#endif
1957 }
1958 else
1959 ev_default_loop_ptr = 0;
1960 }
1961
1962 return ev_default_loop_ptr;
1963}
1964
1965void
1966ev_default_destroy (void)
1967{
1968#if EV_MULTIPLICITY
1969 EV_P = ev_default_loop_ptr;
1970#endif
1971
1972 ev_default_loop_ptr = 0;
1973
1974#ifndef _WIN32
1975 ev_ref (EV_A); /* child watcher */
1976 ev_signal_stop (EV_A_ &childev);
1977#endif
1978
1979 loop_destroy (EV_A);
1980}
1981
1982void
1983ev_default_fork (void)
1984{
1985#if EV_MULTIPLICITY
1986 EV_P = ev_default_loop_ptr;
1987#endif
1988
1989 postfork = 1; /* must be in line with ev_loop_fork */
1990}
1991
1992/*****************************************************************************/
1993
1994void
1995ev_invoke (EV_P_ void *w, int revents)
1996{
1997 EV_CB_INVOKE ((W)w, revents);
1998}
1999
2000unsigned int
2001ev_pending_count (EV_P)
2002{
2003 int pri;
2004 unsigned int count = 0;
2005
2006 for (pri = NUMPRI; pri--; )
2007 count += pendingcnt [pri];
2008
2009 return count;
2010}
2011
2012void noinline
2013ev_invoke_pending (EV_P)
2014{
2015 int pri;
2016
2017 for (pri = NUMPRI; pri--; )
2018 while (pendingcnt [pri])
2019 {
2020 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2021
2022 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
2023 /* ^ this is no longer true, as pending_w could be here */
2024
2025 p->w->pending = 0;
2026 EV_CB_INVOKE (p->w, p->events);
2027 EV_FREQUENT_CHECK;
2028 }
2029}
2030
2031#if EV_IDLE_ENABLE
2032/* make idle watchers pending. this handles the "call-idle */
2033/* only when higher priorities are idle" logic */
2034inline_size void
2035idle_reify (EV_P)
2036{
2037 if (expect_false (idleall))
2038 {
2039 int pri;
2040
2041 for (pri = NUMPRI; pri--; )
2042 {
2043 if (pendingcnt [pri])
2044 break;
2045
2046 if (idlecnt [pri])
2047 {
2048 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2049 break;
2050 }
2051 }
2052 }
2053}
2054#endif
2055
2056/* make timers pending */
2057inline_size void
448timers_reify () 2058timers_reify (EV_P)
449{ 2059{
450 while (timercnt && timers [0]->at <= now) 2060 EV_FREQUENT_CHECK;
451 {
452 struct ev_timer *w = timers [0];
453 2061
454 event ((W)w, EV_TIMEOUT); 2062 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2063 {
2064 do
2065 {
2066 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
455 2067
2068 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2069
456 /* first reschedule or stop timer */ 2070 /* first reschedule or stop timer */
2071 if (w->repeat)
2072 {
2073 ev_at (w) += w->repeat;
2074 if (ev_at (w) < mn_now)
2075 ev_at (w) = mn_now;
2076
2077 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2078
2079 ANHE_at_cache (timers [HEAP0]);
2080 downheap (timers, timercnt, HEAP0);
2081 }
2082 else
2083 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2084
2085 EV_FREQUENT_CHECK;
2086 feed_reverse (EV_A_ (W)w);
2087 }
2088 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2089
2090 feed_reverse_done (EV_A_ EV_TIMEOUT);
2091 }
2092}
2093
2094#if EV_PERIODIC_ENABLE
2095/* make periodics pending */
2096inline_size void
2097periodics_reify (EV_P)
2098{
2099 EV_FREQUENT_CHECK;
2100
2101 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2102 {
2103 int feed_count = 0;
2104
2105 do
2106 {
2107 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2108
2109 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2110
2111 /* first reschedule or stop timer */
2112 if (w->reschedule_cb)
2113 {
2114 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2115
2116 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2117
2118 ANHE_at_cache (periodics [HEAP0]);
2119 downheap (periodics, periodiccnt, HEAP0);
2120 }
2121 else if (w->interval)
2122 {
2123 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2124 /* if next trigger time is not sufficiently in the future, put it there */
2125 /* this might happen because of floating point inexactness */
2126 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2127 {
2128 ev_at (w) += w->interval;
2129
2130 /* if interval is unreasonably low we might still have a time in the past */
2131 /* so correct this. this will make the periodic very inexact, but the user */
2132 /* has effectively asked to get triggered more often than possible */
2133 if (ev_at (w) < ev_rt_now)
2134 ev_at (w) = ev_rt_now;
2135 }
2136
2137 ANHE_at_cache (periodics [HEAP0]);
2138 downheap (periodics, periodiccnt, HEAP0);
2139 }
2140 else
2141 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2142
2143 EV_FREQUENT_CHECK;
2144 feed_reverse (EV_A_ (W)w);
2145 }
2146 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2147
2148 feed_reverse_done (EV_A_ EV_PERIODIC);
2149 }
2150}
2151
2152/* simply recalculate all periodics */
2153/* TODO: maybe ensure that at leats one event happens when jumping forward? */
2154static void noinline
2155periodics_reschedule (EV_P)
2156{
2157 int i;
2158
2159 /* adjust periodics after time jump */
2160 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2161 {
2162 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2163
2164 if (w->reschedule_cb)
2165 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2166 else if (w->interval)
2167 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2168
2169 ANHE_at_cache (periodics [i]);
2170 }
2171
2172 reheap (periodics, periodiccnt);
2173}
2174#endif
2175
2176/* adjust all timers by a given offset */
2177static void noinline
2178timers_reschedule (EV_P_ ev_tstamp adjust)
2179{
2180 int i;
2181
2182 for (i = 0; i < timercnt; ++i)
2183 {
2184 ANHE *he = timers + i + HEAP0;
2185 ANHE_w (*he)->at += adjust;
2186 ANHE_at_cache (*he);
2187 }
2188}
2189
2190/* fetch new monotonic and realtime times from the kernel */
2191/* also detect if there was a timejump, and act accordingly */
2192inline_speed void
2193time_update (EV_P_ ev_tstamp max_block)
2194{
2195#if EV_USE_MONOTONIC
2196 if (expect_true (have_monotonic))
2197 {
2198 int i;
2199 ev_tstamp odiff = rtmn_diff;
2200
2201 mn_now = get_clock ();
2202
2203 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2204 /* interpolate in the meantime */
2205 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2206 {
2207 ev_rt_now = rtmn_diff + mn_now;
2208 return;
2209 }
2210
2211 now_floor = mn_now;
2212 ev_rt_now = ev_time ();
2213
2214 /* loop a few times, before making important decisions.
2215 * on the choice of "4": one iteration isn't enough,
2216 * in case we get preempted during the calls to
2217 * ev_time and get_clock. a second call is almost guaranteed
2218 * to succeed in that case, though. and looping a few more times
2219 * doesn't hurt either as we only do this on time-jumps or
2220 * in the unlikely event of having been preempted here.
2221 */
2222 for (i = 4; --i; )
2223 {
2224 rtmn_diff = ev_rt_now - mn_now;
2225
2226 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2227 return; /* all is well */
2228
2229 ev_rt_now = ev_time ();
2230 mn_now = get_clock ();
2231 now_floor = mn_now;
2232 }
2233
2234 /* no timer adjustment, as the monotonic clock doesn't jump */
2235 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2236# if EV_PERIODIC_ENABLE
2237 periodics_reschedule (EV_A);
2238# endif
2239 }
2240 else
2241#endif
2242 {
2243 ev_rt_now = ev_time ();
2244
2245 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2246 {
2247 /* adjust timers. this is easy, as the offset is the same for all of them */
2248 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2249#if EV_PERIODIC_ENABLE
2250 periodics_reschedule (EV_A);
2251#endif
2252 }
2253
2254 mn_now = ev_rt_now;
2255 }
2256}
2257
2258void
2259ev_loop (EV_P_ int flags)
2260{
2261#if EV_MINIMAL < 2
2262 ++loop_depth;
2263#endif
2264
2265 assert (("libev: ev_loop recursion during release detected", loop_done != EVUNLOOP_RECURSE));
2266
2267 loop_done = EVUNLOOP_CANCEL;
2268
2269 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2270
2271 do
2272 {
2273#if EV_VERIFY >= 2
2274 ev_loop_verify (EV_A);
2275#endif
2276
2277#ifndef _WIN32
2278 if (expect_false (curpid)) /* penalise the forking check even more */
2279 if (expect_false (getpid () != curpid))
2280 {
2281 curpid = getpid ();
2282 postfork = 1;
2283 }
2284#endif
2285
2286#if EV_FORK_ENABLE
2287 /* we might have forked, so queue fork handlers */
2288 if (expect_false (postfork))
2289 if (forkcnt)
2290 {
2291 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2292 EV_INVOKE_PENDING;
2293 }
2294#endif
2295
2296 /* queue prepare watchers (and execute them) */
2297 if (expect_false (preparecnt))
2298 {
2299 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2300 EV_INVOKE_PENDING;
2301 }
2302
2303 if (expect_false (loop_done))
2304 break;
2305
2306 /* we might have forked, so reify kernel state if necessary */
2307 if (expect_false (postfork))
2308 loop_fork (EV_A);
2309
2310 /* update fd-related kernel structures */
2311 fd_reify (EV_A);
2312
2313 /* calculate blocking time */
2314 {
2315 ev_tstamp waittime = 0.;
2316 ev_tstamp sleeptime = 0.;
2317
2318 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
2319 {
2320 /* remember old timestamp for io_blocktime calculation */
2321 ev_tstamp prev_mn_now = mn_now;
2322
2323 /* update time to cancel out callback processing overhead */
2324 time_update (EV_A_ 1e100);
2325
2326 waittime = MAX_BLOCKTIME;
2327
2328 if (timercnt)
2329 {
2330 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2331 if (waittime > to) waittime = to;
2332 }
2333
2334#if EV_PERIODIC_ENABLE
2335 if (periodiccnt)
2336 {
2337 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2338 if (waittime > to) waittime = to;
2339 }
2340#endif
2341
2342 /* don't let timeouts decrease the waittime below timeout_blocktime */
2343 if (expect_false (waittime < timeout_blocktime))
2344 waittime = timeout_blocktime;
2345
2346 /* extra check because io_blocktime is commonly 0 */
2347 if (expect_false (io_blocktime))
2348 {
2349 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2350
2351 if (sleeptime > waittime - backend_fudge)
2352 sleeptime = waittime - backend_fudge;
2353
2354 if (expect_true (sleeptime > 0.))
2355 {
2356 ev_sleep (sleeptime);
2357 waittime -= sleeptime;
2358 }
2359 }
2360 }
2361
2362#if EV_MINIMAL < 2
2363 ++loop_count;
2364#endif
2365 assert ((loop_done = EVUNLOOP_RECURSE, 1)); /* assert for side effect */
2366 backend_poll (EV_A_ waittime);
2367 assert ((loop_done = EVUNLOOP_CANCEL, 1)); /* assert for side effect */
2368
2369 /* update ev_rt_now, do magic */
2370 time_update (EV_A_ waittime + sleeptime);
2371 }
2372
2373 /* queue pending timers and reschedule them */
2374 timers_reify (EV_A); /* relative timers called last */
2375#if EV_PERIODIC_ENABLE
2376 periodics_reify (EV_A); /* absolute timers called first */
2377#endif
2378
2379#if EV_IDLE_ENABLE
2380 /* queue idle watchers unless other events are pending */
2381 idle_reify (EV_A);
2382#endif
2383
2384 /* queue check watchers, to be executed first */
2385 if (expect_false (checkcnt))
2386 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2387
2388 EV_INVOKE_PENDING;
2389 }
2390 while (expect_true (
2391 activecnt
2392 && !loop_done
2393 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2394 ));
2395
2396 if (loop_done == EVUNLOOP_ONE)
2397 loop_done = EVUNLOOP_CANCEL;
2398
2399#if EV_MINIMAL < 2
2400 --loop_depth;
2401#endif
2402}
2403
2404void
2405ev_unloop (EV_P_ int how)
2406{
2407 loop_done = how;
2408}
2409
2410void
2411ev_ref (EV_P)
2412{
2413 ++activecnt;
2414}
2415
2416void
2417ev_unref (EV_P)
2418{
2419 --activecnt;
2420}
2421
2422void
2423ev_now_update (EV_P)
2424{
2425 time_update (EV_A_ 1e100);
2426}
2427
2428void
2429ev_suspend (EV_P)
2430{
2431 ev_now_update (EV_A);
2432}
2433
2434void
2435ev_resume (EV_P)
2436{
2437 ev_tstamp mn_prev = mn_now;
2438
2439 ev_now_update (EV_A);
2440 timers_reschedule (EV_A_ mn_now - mn_prev);
2441#if EV_PERIODIC_ENABLE
2442 /* TODO: really do this? */
2443 periodics_reschedule (EV_A);
2444#endif
2445}
2446
2447/*****************************************************************************/
2448/* singly-linked list management, used when the expected list length is short */
2449
2450inline_size void
2451wlist_add (WL *head, WL elem)
2452{
2453 elem->next = *head;
2454 *head = elem;
2455}
2456
2457inline_size void
2458wlist_del (WL *head, WL elem)
2459{
2460 while (*head)
2461 {
2462 if (expect_true (*head == elem))
2463 {
2464 *head = elem->next;
2465 break;
2466 }
2467
2468 head = &(*head)->next;
2469 }
2470}
2471
2472/* internal, faster, version of ev_clear_pending */
2473inline_speed void
2474clear_pending (EV_P_ W w)
2475{
2476 if (w->pending)
2477 {
2478 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2479 w->pending = 0;
2480 }
2481}
2482
2483int
2484ev_clear_pending (EV_P_ void *w)
2485{
2486 W w_ = (W)w;
2487 int pending = w_->pending;
2488
2489 if (expect_true (pending))
2490 {
2491 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2492 p->w = (W)&pending_w;
2493 w_->pending = 0;
2494 return p->events;
2495 }
2496 else
2497 return 0;
2498}
2499
2500inline_size void
2501pri_adjust (EV_P_ W w)
2502{
2503 int pri = ev_priority (w);
2504 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2505 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2506 ev_set_priority (w, pri);
2507}
2508
2509inline_speed void
2510ev_start (EV_P_ W w, int active)
2511{
2512 pri_adjust (EV_A_ w);
2513 w->active = active;
2514 ev_ref (EV_A);
2515}
2516
2517inline_size void
2518ev_stop (EV_P_ W w)
2519{
2520 ev_unref (EV_A);
2521 w->active = 0;
2522}
2523
2524/*****************************************************************************/
2525
2526void noinline
2527ev_io_start (EV_P_ ev_io *w)
2528{
2529 int fd = w->fd;
2530
2531 if (expect_false (ev_is_active (w)))
2532 return;
2533
2534 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2535 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2536
2537 EV_FREQUENT_CHECK;
2538
2539 ev_start (EV_A_ (W)w, 1);
2540 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2541 wlist_add (&anfds[fd].head, (WL)w);
2542
2543 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2544 w->events &= ~EV__IOFDSET;
2545
2546 EV_FREQUENT_CHECK;
2547}
2548
2549void noinline
2550ev_io_stop (EV_P_ ev_io *w)
2551{
2552 clear_pending (EV_A_ (W)w);
2553 if (expect_false (!ev_is_active (w)))
2554 return;
2555
2556 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2557
2558 EV_FREQUENT_CHECK;
2559
2560 wlist_del (&anfds[w->fd].head, (WL)w);
2561 ev_stop (EV_A_ (W)w);
2562
2563 fd_change (EV_A_ w->fd, 1);
2564
2565 EV_FREQUENT_CHECK;
2566}
2567
2568void noinline
2569ev_timer_start (EV_P_ ev_timer *w)
2570{
2571 if (expect_false (ev_is_active (w)))
2572 return;
2573
2574 ev_at (w) += mn_now;
2575
2576 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2577
2578 EV_FREQUENT_CHECK;
2579
2580 ++timercnt;
2581 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2582 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2583 ANHE_w (timers [ev_active (w)]) = (WT)w;
2584 ANHE_at_cache (timers [ev_active (w)]);
2585 upheap (timers, ev_active (w));
2586
2587 EV_FREQUENT_CHECK;
2588
2589 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2590}
2591
2592void noinline
2593ev_timer_stop (EV_P_ ev_timer *w)
2594{
2595 clear_pending (EV_A_ (W)w);
2596 if (expect_false (!ev_is_active (w)))
2597 return;
2598
2599 EV_FREQUENT_CHECK;
2600
2601 {
2602 int active = ev_active (w);
2603
2604 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2605
2606 --timercnt;
2607
2608 if (expect_true (active < timercnt + HEAP0))
2609 {
2610 timers [active] = timers [timercnt + HEAP0];
2611 adjustheap (timers, timercnt, active);
2612 }
2613 }
2614
2615 ev_at (w) -= mn_now;
2616
2617 ev_stop (EV_A_ (W)w);
2618
2619 EV_FREQUENT_CHECK;
2620}
2621
2622void noinline
2623ev_timer_again (EV_P_ ev_timer *w)
2624{
2625 EV_FREQUENT_CHECK;
2626
2627 if (ev_is_active (w))
2628 {
457 if (w->repeat) 2629 if (w->repeat)
458 { 2630 {
459 w->at = now + w->repeat; 2631 ev_at (w) = mn_now + w->repeat;
460 assert (("timer timeout in the past, negative repeat?", w->at > now)); 2632 ANHE_at_cache (timers [ev_active (w)]);
461 downheap ((WT *)timers, timercnt, 0); 2633 adjustheap (timers, timercnt, ev_active (w));
462 } 2634 }
463 else 2635 else
464 evtimer_stop (w); /* nonrepeating: stop timer */ 2636 ev_timer_stop (EV_A_ w);
465 }
466}
467
468static void
469periodics_reify ()
470{
471 while (periodiccnt && periodics [0]->at <= ev_now)
472 { 2637 }
473 struct ev_periodic *w = periodics [0]; 2638 else if (w->repeat)
2639 {
2640 ev_at (w) = w->repeat;
2641 ev_timer_start (EV_A_ w);
2642 }
474 2643
475 /* first reschedule or stop timer */ 2644 EV_FREQUENT_CHECK;
2645}
2646
2647ev_tstamp
2648ev_timer_remaining (EV_P_ ev_timer *w)
2649{
2650 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2651}
2652
2653#if EV_PERIODIC_ENABLE
2654void noinline
2655ev_periodic_start (EV_P_ ev_periodic *w)
2656{
2657 if (expect_false (ev_is_active (w)))
2658 return;
2659
2660 if (w->reschedule_cb)
2661 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
476 if (w->interval) 2662 else if (w->interval)
2663 {
2664 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2665 /* this formula differs from the one in periodic_reify because we do not always round up */
2666 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2667 }
2668 else
2669 ev_at (w) = w->offset;
2670
2671 EV_FREQUENT_CHECK;
2672
2673 ++periodiccnt;
2674 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2675 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2676 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2677 ANHE_at_cache (periodics [ev_active (w)]);
2678 upheap (periodics, ev_active (w));
2679
2680 EV_FREQUENT_CHECK;
2681
2682 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2683}
2684
2685void noinline
2686ev_periodic_stop (EV_P_ ev_periodic *w)
2687{
2688 clear_pending (EV_A_ (W)w);
2689 if (expect_false (!ev_is_active (w)))
2690 return;
2691
2692 EV_FREQUENT_CHECK;
2693
2694 {
2695 int active = ev_active (w);
2696
2697 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2698
2699 --periodiccnt;
2700
2701 if (expect_true (active < periodiccnt + HEAP0))
2702 {
2703 periodics [active] = periodics [periodiccnt + HEAP0];
2704 adjustheap (periodics, periodiccnt, active);
2705 }
2706 }
2707
2708 ev_stop (EV_A_ (W)w);
2709
2710 EV_FREQUENT_CHECK;
2711}
2712
2713void noinline
2714ev_periodic_again (EV_P_ ev_periodic *w)
2715{
2716 /* TODO: use adjustheap and recalculation */
2717 ev_periodic_stop (EV_A_ w);
2718 ev_periodic_start (EV_A_ w);
2719}
2720#endif
2721
2722#ifndef SA_RESTART
2723# define SA_RESTART 0
2724#endif
2725
2726void noinline
2727ev_signal_start (EV_P_ ev_signal *w)
2728{
2729 if (expect_false (ev_is_active (w)))
2730 return;
2731
2732 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2733
2734#if EV_MULTIPLICITY
2735 assert (("libev: a signal must not be attached to two different loops",
2736 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2737
2738 signals [w->signum - 1].loop = EV_A;
2739#endif
2740
2741 EV_FREQUENT_CHECK;
2742
2743#if EV_USE_SIGNALFD
2744 if (sigfd == -2)
2745 {
2746 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2747 if (sigfd < 0 && errno == EINVAL)
2748 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2749
2750 if (sigfd >= 0)
477 { 2751 {
478 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 2752 fd_intern (sigfd); /* doing it twice will not hurt */
479 assert (("periodic timeout in the past, negative interval?", w->at > ev_now)); 2753
480 downheap ((WT *)periodics, periodiccnt, 0); 2754 sigemptyset (&sigfd_set);
2755
2756 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2757 ev_set_priority (&sigfd_w, EV_MAXPRI);
2758 ev_io_start (EV_A_ &sigfd_w);
2759 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2760 }
2761 }
2762
2763 if (sigfd >= 0)
2764 {
2765 /* TODO: check .head */
2766 sigaddset (&sigfd_set, w->signum);
2767 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2768
2769 signalfd (sigfd, &sigfd_set, 0);
2770 }
2771#endif
2772
2773 ev_start (EV_A_ (W)w, 1);
2774 wlist_add (&signals [w->signum - 1].head, (WL)w);
2775
2776 if (!((WL)w)->next)
2777# if EV_USE_SIGNALFD
2778 if (sigfd < 0) /*TODO*/
2779# endif
2780 {
2781# ifdef _WIN32
2782 evpipe_init (EV_A);
2783
2784 signal (w->signum, ev_sighandler);
2785# else
2786 struct sigaction sa;
2787
2788 evpipe_init (EV_A);
2789
2790 sa.sa_handler = ev_sighandler;
2791 sigfillset (&sa.sa_mask);
2792 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2793 sigaction (w->signum, &sa, 0);
2794
2795 sigemptyset (&sa.sa_mask);
2796 sigaddset (&sa.sa_mask, w->signum);
2797 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2798#endif
2799 }
2800
2801 EV_FREQUENT_CHECK;
2802}
2803
2804void noinline
2805ev_signal_stop (EV_P_ ev_signal *w)
2806{
2807 clear_pending (EV_A_ (W)w);
2808 if (expect_false (!ev_is_active (w)))
2809 return;
2810
2811 EV_FREQUENT_CHECK;
2812
2813 wlist_del (&signals [w->signum - 1].head, (WL)w);
2814 ev_stop (EV_A_ (W)w);
2815
2816 if (!signals [w->signum - 1].head)
2817 {
2818#if EV_MULTIPLICITY
2819 signals [w->signum - 1].loop = 0; /* unattach from signal */
2820#endif
2821#if EV_USE_SIGNALFD
2822 if (sigfd >= 0)
2823 {
2824 sigset_t ss;
2825
2826 sigemptyset (&ss);
2827 sigaddset (&ss, w->signum);
2828 sigdelset (&sigfd_set, w->signum);
2829
2830 signalfd (sigfd, &sigfd_set, 0);
2831 sigprocmask (SIG_UNBLOCK, &ss, 0);
481 } 2832 }
482 else 2833 else
483 evperiodic_stop (w); /* nonrepeating: stop timer */ 2834#endif
484 2835 signal (w->signum, SIG_DFL);
485 event ((W)w, EV_TIMEOUT);
486 }
487}
488
489static void
490periodics_reschedule (ev_tstamp diff)
491{
492 int i;
493
494 /* adjust periodics after time jump */
495 for (i = 0; i < periodiccnt; ++i)
496 { 2836 }
497 struct ev_periodic *w = periodics [i];
498 2837
499 if (w->interval) 2838 EV_FREQUENT_CHECK;
2839}
2840
2841void
2842ev_child_start (EV_P_ ev_child *w)
2843{
2844#if EV_MULTIPLICITY
2845 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2846#endif
2847 if (expect_false (ev_is_active (w)))
2848 return;
2849
2850 EV_FREQUENT_CHECK;
2851
2852 ev_start (EV_A_ (W)w, 1);
2853 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2854
2855 EV_FREQUENT_CHECK;
2856}
2857
2858void
2859ev_child_stop (EV_P_ ev_child *w)
2860{
2861 clear_pending (EV_A_ (W)w);
2862 if (expect_false (!ev_is_active (w)))
2863 return;
2864
2865 EV_FREQUENT_CHECK;
2866
2867 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2868 ev_stop (EV_A_ (W)w);
2869
2870 EV_FREQUENT_CHECK;
2871}
2872
2873#if EV_STAT_ENABLE
2874
2875# ifdef _WIN32
2876# undef lstat
2877# define lstat(a,b) _stati64 (a,b)
2878# endif
2879
2880#define DEF_STAT_INTERVAL 5.0074891
2881#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2882#define MIN_STAT_INTERVAL 0.1074891
2883
2884static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2885
2886#if EV_USE_INOTIFY
2887
2888/* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
2889# define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
2890
2891static void noinline
2892infy_add (EV_P_ ev_stat *w)
2893{
2894 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);
2895
2896 if (w->wd >= 0)
2897 {
2898 struct statfs sfs;
2899
2900 /* now local changes will be tracked by inotify, but remote changes won't */
2901 /* unless the filesystem is known to be local, we therefore still poll */
2902 /* also do poll on <2.6.25, but with normal frequency */
2903
2904 if (!fs_2625)
2905 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2906 else if (!statfs (w->path, &sfs)
2907 && (sfs.f_type == 0x1373 /* devfs */
2908 || sfs.f_type == 0xEF53 /* ext2/3 */
2909 || sfs.f_type == 0x3153464a /* jfs */
2910 || sfs.f_type == 0x52654973 /* reiser3 */
2911 || sfs.f_type == 0x01021994 /* tempfs */
2912 || sfs.f_type == 0x58465342 /* xfs */))
2913 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
2914 else
2915 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
2916 }
2917 else
2918 {
2919 /* can't use inotify, continue to stat */
2920 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2921
2922 /* if path is not there, monitor some parent directory for speedup hints */
2923 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2924 /* but an efficiency issue only */
2925 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
500 { 2926 {
501 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 2927 char path [4096];
2928 strcpy (path, w->path);
502 2929
503 if (fabs (diff) >= 1e-4) 2930 do
504 { 2931 {
505 evperiodic_stop (w); 2932 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
506 evperiodic_start (w); 2933 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
507 2934
508 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 2935 char *pend = strrchr (path, '/');
2936
2937 if (!pend || pend == path)
2938 break;
2939
2940 *pend = 0;
2941 w->wd = inotify_add_watch (fs_fd, path, mask);
2942 }
2943 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2944 }
2945 }
2946
2947 if (w->wd >= 0)
2948 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2949
2950 /* now re-arm timer, if required */
2951 if (ev_is_active (&w->timer)) ev_ref (EV_A);
2952 ev_timer_again (EV_A_ &w->timer);
2953 if (ev_is_active (&w->timer)) ev_unref (EV_A);
2954}
2955
2956static void noinline
2957infy_del (EV_P_ ev_stat *w)
2958{
2959 int slot;
2960 int wd = w->wd;
2961
2962 if (wd < 0)
2963 return;
2964
2965 w->wd = -2;
2966 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2967 wlist_del (&fs_hash [slot].head, (WL)w);
2968
2969 /* remove this watcher, if others are watching it, they will rearm */
2970 inotify_rm_watch (fs_fd, wd);
2971}
2972
2973static void noinline
2974infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2975{
2976 if (slot < 0)
2977 /* overflow, need to check for all hash slots */
2978 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2979 infy_wd (EV_A_ slot, wd, ev);
2980 else
2981 {
2982 WL w_;
2983
2984 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2985 {
2986 ev_stat *w = (ev_stat *)w_;
2987 w_ = w_->next; /* lets us remove this watcher and all before it */
2988
2989 if (w->wd == wd || wd == -1)
2990 {
2991 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2992 {
2993 wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2994 w->wd = -1;
2995 infy_add (EV_A_ w); /* re-add, no matter what */
2996 }
2997
2998 stat_timer_cb (EV_A_ &w->timer, 0);
509 } 2999 }
510 } 3000 }
511 } 3001 }
512} 3002}
513 3003
514static void 3004static void
515time_update () 3005infy_cb (EV_P_ ev_io *w, int revents)
516{ 3006{
3007 char buf [EV_INOTIFY_BUFSIZE];
3008 int ofs;
3009 int len = read (fs_fd, buf, sizeof (buf));
3010
3011 for (ofs = 0; ofs < len; )
3012 {
3013 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3014 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3015 ofs += sizeof (struct inotify_event) + ev->len;
3016 }
3017}
3018
3019inline_size unsigned int
3020ev_linux_version (void)
3021{
3022 struct utsname buf;
3023 unsigned int v;
517 int i; 3024 int i;
3025 char *p = buf.release;
518 3026
519 ev_now = ev_time (); 3027 if (uname (&buf))
3028 return 0;
520 3029
521 if (have_monotonic) 3030 for (i = 3+1; --i; )
522 { 3031 {
523 ev_tstamp odiff = diff; 3032 unsigned int c = 0;
524 3033
525 for (i = 4; --i; ) /* loop a few times, before making important decisions */ 3034 for (;;)
526 { 3035 {
527 now = get_clock (); 3036 if (*p >= '0' && *p <= '9')
528 diff = ev_now - now; 3037 c = c * 10 + *p++ - '0';
529 3038 else
530 if (fabs (odiff - diff) < MIN_TIMEJUMP) 3039 {
531 return; /* all is well */ 3040 p += *p == '.';
532 3041 break;
533 ev_now = ev_time (); 3042 }
534 } 3043 }
535 3044
536 periodics_reschedule (diff - odiff); 3045 v = (v << 8) | c;
537 /* no timer adjustment, as the monotonic clock doesn't jump */ 3046 }
3047
3048 return v;
3049}
3050
3051inline_size void
3052ev_check_2625 (EV_P)
3053{
3054 /* kernels < 2.6.25 are borked
3055 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3056 */
3057 if (ev_linux_version () < 0x020619)
3058 return;
3059
3060 fs_2625 = 1;
3061}
3062
3063inline_size int
3064infy_newfd (void)
3065{
3066#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3067 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3068 if (fd >= 0)
3069 return fd;
3070#endif
3071 return inotify_init ();
3072}
3073
3074inline_size void
3075infy_init (EV_P)
3076{
3077 if (fs_fd != -2)
3078 return;
3079
3080 fs_fd = -1;
3081
3082 ev_check_2625 (EV_A);
3083
3084 fs_fd = infy_newfd ();
3085
3086 if (fs_fd >= 0)
538 } 3087 {
3088 fd_intern (fs_fd);
3089 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3090 ev_set_priority (&fs_w, EV_MAXPRI);
3091 ev_io_start (EV_A_ &fs_w);
3092 ev_unref (EV_A);
3093 }
3094}
3095
3096inline_size void
3097infy_fork (EV_P)
3098{
3099 int slot;
3100
3101 if (fs_fd < 0)
3102 return;
3103
3104 ev_ref (EV_A);
3105 ev_io_stop (EV_A_ &fs_w);
3106 close (fs_fd);
3107 fs_fd = infy_newfd ();
3108
3109 if (fs_fd >= 0)
3110 {
3111 fd_intern (fs_fd);
3112 ev_io_set (&fs_w, fs_fd, EV_READ);
3113 ev_io_start (EV_A_ &fs_w);
3114 ev_unref (EV_A);
3115 }
3116
3117 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
3118 {
3119 WL w_ = fs_hash [slot].head;
3120 fs_hash [slot].head = 0;
3121
3122 while (w_)
3123 {
3124 ev_stat *w = (ev_stat *)w_;
3125 w_ = w_->next; /* lets us add this watcher */
3126
3127 w->wd = -1;
3128
3129 if (fs_fd >= 0)
3130 infy_add (EV_A_ w); /* re-add, no matter what */
3131 else
3132 {
3133 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3134 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3135 ev_timer_again (EV_A_ &w->timer);
3136 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3137 }
3138 }
3139 }
3140}
3141
3142#endif
3143
3144#ifdef _WIN32
3145# define EV_LSTAT(p,b) _stati64 (p, b)
3146#else
3147# define EV_LSTAT(p,b) lstat (p, b)
3148#endif
3149
3150void
3151ev_stat_stat (EV_P_ ev_stat *w)
3152{
3153 if (lstat (w->path, &w->attr) < 0)
3154 w->attr.st_nlink = 0;
3155 else if (!w->attr.st_nlink)
3156 w->attr.st_nlink = 1;
3157}
3158
3159static void noinline
3160stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3161{
3162 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3163
3164 ev_statdata prev = w->attr;
3165 ev_stat_stat (EV_A_ w);
3166
3167 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3168 if (
3169 prev.st_dev != w->attr.st_dev
3170 || prev.st_ino != w->attr.st_ino
3171 || prev.st_mode != w->attr.st_mode
3172 || prev.st_nlink != w->attr.st_nlink
3173 || prev.st_uid != w->attr.st_uid
3174 || prev.st_gid != w->attr.st_gid
3175 || prev.st_rdev != w->attr.st_rdev
3176 || prev.st_size != w->attr.st_size
3177 || prev.st_atime != w->attr.st_atime
3178 || prev.st_mtime != w->attr.st_mtime
3179 || prev.st_ctime != w->attr.st_ctime
3180 ) {
3181 /* we only update w->prev on actual differences */
3182 /* in case we test more often than invoke the callback, */
3183 /* to ensure that prev is always different to attr */
3184 w->prev = prev;
3185
3186 #if EV_USE_INOTIFY
3187 if (fs_fd >= 0)
3188 {
3189 infy_del (EV_A_ w);
3190 infy_add (EV_A_ w);
3191 ev_stat_stat (EV_A_ w); /* avoid race... */
3192 }
3193 #endif
3194
3195 ev_feed_event (EV_A_ w, EV_STAT);
3196 }
3197}
3198
3199void
3200ev_stat_start (EV_P_ ev_stat *w)
3201{
3202 if (expect_false (ev_is_active (w)))
3203 return;
3204
3205 ev_stat_stat (EV_A_ w);
3206
3207 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3208 w->interval = MIN_STAT_INTERVAL;
3209
3210 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3211 ev_set_priority (&w->timer, ev_priority (w));
3212
3213#if EV_USE_INOTIFY
3214 infy_init (EV_A);
3215
3216 if (fs_fd >= 0)
3217 infy_add (EV_A_ w);
539 else 3218 else
3219#endif
3220 {
3221 ev_timer_again (EV_A_ &w->timer);
3222 ev_unref (EV_A);
540 { 3223 }
541 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) 3224
3225 ev_start (EV_A_ (W)w, 1);
3226
3227 EV_FREQUENT_CHECK;
3228}
3229
3230void
3231ev_stat_stop (EV_P_ ev_stat *w)
3232{
3233 clear_pending (EV_A_ (W)w);
3234 if (expect_false (!ev_is_active (w)))
3235 return;
3236
3237 EV_FREQUENT_CHECK;
3238
3239#if EV_USE_INOTIFY
3240 infy_del (EV_A_ w);
3241#endif
3242
3243 if (ev_is_active (&w->timer))
3244 {
3245 ev_ref (EV_A);
3246 ev_timer_stop (EV_A_ &w->timer);
3247 }
3248
3249 ev_stop (EV_A_ (W)w);
3250
3251 EV_FREQUENT_CHECK;
3252}
3253#endif
3254
3255#if EV_IDLE_ENABLE
3256void
3257ev_idle_start (EV_P_ ev_idle *w)
3258{
3259 if (expect_false (ev_is_active (w)))
3260 return;
3261
3262 pri_adjust (EV_A_ (W)w);
3263
3264 EV_FREQUENT_CHECK;
3265
3266 {
3267 int active = ++idlecnt [ABSPRI (w)];
3268
3269 ++idleall;
3270 ev_start (EV_A_ (W)w, active);
3271
3272 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3273 idles [ABSPRI (w)][active - 1] = w;
3274 }
3275
3276 EV_FREQUENT_CHECK;
3277}
3278
3279void
3280ev_idle_stop (EV_P_ ev_idle *w)
3281{
3282 clear_pending (EV_A_ (W)w);
3283 if (expect_false (!ev_is_active (w)))
3284 return;
3285
3286 EV_FREQUENT_CHECK;
3287
3288 {
3289 int active = ev_active (w);
3290
3291 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3292 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3293
3294 ev_stop (EV_A_ (W)w);
3295 --idleall;
3296 }
3297
3298 EV_FREQUENT_CHECK;
3299}
3300#endif
3301
3302void
3303ev_prepare_start (EV_P_ ev_prepare *w)
3304{
3305 if (expect_false (ev_is_active (w)))
3306 return;
3307
3308 EV_FREQUENT_CHECK;
3309
3310 ev_start (EV_A_ (W)w, ++preparecnt);
3311 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3312 prepares [preparecnt - 1] = w;
3313
3314 EV_FREQUENT_CHECK;
3315}
3316
3317void
3318ev_prepare_stop (EV_P_ ev_prepare *w)
3319{
3320 clear_pending (EV_A_ (W)w);
3321 if (expect_false (!ev_is_active (w)))
3322 return;
3323
3324 EV_FREQUENT_CHECK;
3325
3326 {
3327 int active = ev_active (w);
3328
3329 prepares [active - 1] = prepares [--preparecnt];
3330 ev_active (prepares [active - 1]) = active;
3331 }
3332
3333 ev_stop (EV_A_ (W)w);
3334
3335 EV_FREQUENT_CHECK;
3336}
3337
3338void
3339ev_check_start (EV_P_ ev_check *w)
3340{
3341 if (expect_false (ev_is_active (w)))
3342 return;
3343
3344 EV_FREQUENT_CHECK;
3345
3346 ev_start (EV_A_ (W)w, ++checkcnt);
3347 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3348 checks [checkcnt - 1] = w;
3349
3350 EV_FREQUENT_CHECK;
3351}
3352
3353void
3354ev_check_stop (EV_P_ ev_check *w)
3355{
3356 clear_pending (EV_A_ (W)w);
3357 if (expect_false (!ev_is_active (w)))
3358 return;
3359
3360 EV_FREQUENT_CHECK;
3361
3362 {
3363 int active = ev_active (w);
3364
3365 checks [active - 1] = checks [--checkcnt];
3366 ev_active (checks [active - 1]) = active;
3367 }
3368
3369 ev_stop (EV_A_ (W)w);
3370
3371 EV_FREQUENT_CHECK;
3372}
3373
3374#if EV_EMBED_ENABLE
3375void noinline
3376ev_embed_sweep (EV_P_ ev_embed *w)
3377{
3378 ev_loop (w->other, EVLOOP_NONBLOCK);
3379}
3380
3381static void
3382embed_io_cb (EV_P_ ev_io *io, int revents)
3383{
3384 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3385
3386 if (ev_cb (w))
3387 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3388 else
3389 ev_loop (w->other, EVLOOP_NONBLOCK);
3390}
3391
3392static void
3393embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3394{
3395 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3396
3397 {
3398 EV_P = w->other;
3399
3400 while (fdchangecnt)
542 { 3401 {
543 periodics_reschedule (ev_now - now); 3402 fd_reify (EV_A);
544 3403 ev_loop (EV_A_ EVLOOP_NONBLOCK);
545 /* adjust timers. this is easy, as the offset is the same for all */
546 for (i = 0; i < timercnt; ++i)
547 timers [i]->at += diff;
548 } 3404 }
549
550 now = ev_now;
551 } 3405 }
552} 3406}
553 3407
554int ev_loop_done; 3408static void
555 3409embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
556void ev_loop (int flags)
557{ 3410{
558 double block; 3411 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
559 ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;
560 3412
561 do 3413 ev_embed_stop (EV_A_ w);
3414
562 { 3415 {
563 /* queue check watchers (and execute them) */ 3416 EV_P = w->other;
564 if (checkcnt)
565 {
566 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
567 call_pending ();
568 }
569 3417
570 /* update fd-related kernel structures */ 3418 ev_loop_fork (EV_A);
571 fd_reify (); 3419 ev_loop (EV_A_ EVLOOP_NONBLOCK);
572
573 /* calculate blocking time */
574
575 /* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */
576 ev_now = ev_time ();
577
578 if (flags & EVLOOP_NONBLOCK || idlecnt)
579 block = 0.;
580 else
581 {
582 block = MAX_BLOCKTIME;
583
584 if (timercnt)
585 {
586 ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
587 if (block > to) block = to;
588 }
589
590 if (periodiccnt)
591 {
592 ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
593 if (block > to) block = to;
594 }
595
596 if (block < 0.) block = 0.;
597 }
598
599 method_poll (block);
600
601 /* update ev_now, do magic */
602 time_update ();
603
604 /* queue pending timers and reschedule them */
605 timers_reify (); /* relative timers called last */
606 periodics_reify (); /* absolute timers called first */
607
608 /* queue idle watchers unless io or timers are pending */
609 if (!pendingcnt)
610 queue_events ((W *)idles, idlecnt, EV_IDLE);
611
612 /* queue check watchers, to be executed first */
613 if (checkcnt)
614 queue_events ((W *)checks, checkcnt, EV_CHECK);
615
616 call_pending ();
617 } 3420 }
618 while (!ev_loop_done);
619 3421
620 if (ev_loop_done != 2) 3422 ev_embed_start (EV_A_ w);
621 ev_loop_done = 0;
622} 3423}
3424
3425#if 0
3426static void
3427embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3428{
3429 ev_idle_stop (EV_A_ idle);
3430}
3431#endif
3432
3433void
3434ev_embed_start (EV_P_ ev_embed *w)
3435{
3436 if (expect_false (ev_is_active (w)))
3437 return;
3438
3439 {
3440 EV_P = w->other;
3441 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3442 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3443 }
3444
3445 EV_FREQUENT_CHECK;
3446
3447 ev_set_priority (&w->io, ev_priority (w));
3448 ev_io_start (EV_A_ &w->io);
3449
3450 ev_prepare_init (&w->prepare, embed_prepare_cb);
3451 ev_set_priority (&w->prepare, EV_MINPRI);
3452 ev_prepare_start (EV_A_ &w->prepare);
3453
3454 ev_fork_init (&w->fork, embed_fork_cb);
3455 ev_fork_start (EV_A_ &w->fork);
3456
3457 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3458
3459 ev_start (EV_A_ (W)w, 1);
3460
3461 EV_FREQUENT_CHECK;
3462}
3463
3464void
3465ev_embed_stop (EV_P_ ev_embed *w)
3466{
3467 clear_pending (EV_A_ (W)w);
3468 if (expect_false (!ev_is_active (w)))
3469 return;
3470
3471 EV_FREQUENT_CHECK;
3472
3473 ev_io_stop (EV_A_ &w->io);
3474 ev_prepare_stop (EV_A_ &w->prepare);
3475 ev_fork_stop (EV_A_ &w->fork);
3476
3477 ev_stop (EV_A_ (W)w);
3478
3479 EV_FREQUENT_CHECK;
3480}
3481#endif
3482
3483#if EV_FORK_ENABLE
3484void
3485ev_fork_start (EV_P_ ev_fork *w)
3486{
3487 if (expect_false (ev_is_active (w)))
3488 return;
3489
3490 EV_FREQUENT_CHECK;
3491
3492 ev_start (EV_A_ (W)w, ++forkcnt);
3493 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3494 forks [forkcnt - 1] = w;
3495
3496 EV_FREQUENT_CHECK;
3497}
3498
3499void
3500ev_fork_stop (EV_P_ ev_fork *w)
3501{
3502 clear_pending (EV_A_ (W)w);
3503 if (expect_false (!ev_is_active (w)))
3504 return;
3505
3506 EV_FREQUENT_CHECK;
3507
3508 {
3509 int active = ev_active (w);
3510
3511 forks [active - 1] = forks [--forkcnt];
3512 ev_active (forks [active - 1]) = active;
3513 }
3514
3515 ev_stop (EV_A_ (W)w);
3516
3517 EV_FREQUENT_CHECK;
3518}
3519#endif
3520
3521#if EV_ASYNC_ENABLE
3522void
3523ev_async_start (EV_P_ ev_async *w)
3524{
3525 if (expect_false (ev_is_active (w)))
3526 return;
3527
3528 evpipe_init (EV_A);
3529
3530 EV_FREQUENT_CHECK;
3531
3532 ev_start (EV_A_ (W)w, ++asynccnt);
3533 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3534 asyncs [asynccnt - 1] = w;
3535
3536 EV_FREQUENT_CHECK;
3537}
3538
3539void
3540ev_async_stop (EV_P_ ev_async *w)
3541{
3542 clear_pending (EV_A_ (W)w);
3543 if (expect_false (!ev_is_active (w)))
3544 return;
3545
3546 EV_FREQUENT_CHECK;
3547
3548 {
3549 int active = ev_active (w);
3550
3551 asyncs [active - 1] = asyncs [--asynccnt];
3552 ev_active (asyncs [active - 1]) = active;
3553 }
3554
3555 ev_stop (EV_A_ (W)w);
3556
3557 EV_FREQUENT_CHECK;
3558}
3559
3560void
3561ev_async_send (EV_P_ ev_async *w)
3562{
3563 w->sent = 1;
3564 evpipe_write (EV_A_ &async_pending);
3565}
3566#endif
623 3567
624/*****************************************************************************/ 3568/*****************************************************************************/
625 3569
626static void
627wlist_add (WL *head, WL elem)
628{
629 elem->next = *head;
630 *head = elem;
631}
632
633static void
634wlist_del (WL *head, WL elem)
635{
636 while (*head)
637 {
638 if (*head == elem)
639 {
640 *head = elem->next;
641 return;
642 }
643
644 head = &(*head)->next;
645 }
646}
647
648static void
649ev_clear (W w)
650{
651 if (w->pending)
652 {
653 pendings [w->pending - 1].w = 0;
654 w->pending = 0;
655 }
656}
657
658static void
659ev_start (W w, int active)
660{
661 w->active = active;
662}
663
664static void
665ev_stop (W w)
666{
667 w->active = 0;
668}
669
670/*****************************************************************************/
671
672void
673evio_start (struct ev_io *w)
674{
675 if (ev_is_active (w))
676 return;
677
678 int fd = w->fd;
679
680 ev_start ((W)w, 1);
681 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
682 wlist_add ((WL *)&anfds[fd].head, (WL)w);
683
684 ++fdchangecnt;
685 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
686 fdchanges [fdchangecnt - 1] = fd;
687}
688
689void
690evio_stop (struct ev_io *w)
691{
692 ev_clear ((W)w);
693 if (!ev_is_active (w))
694 return;
695
696 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
697 ev_stop ((W)w);
698
699 ++fdchangecnt;
700 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
701 fdchanges [fdchangecnt - 1] = w->fd;
702}
703
704void
705evtimer_start (struct ev_timer *w)
706{
707 if (ev_is_active (w))
708 return;
709
710 w->at += now;
711
712 assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
713
714 ev_start ((W)w, ++timercnt);
715 array_needsize (timers, timermax, timercnt, );
716 timers [timercnt - 1] = w;
717 upheap ((WT *)timers, timercnt - 1);
718}
719
720void
721evtimer_stop (struct ev_timer *w)
722{
723 ev_clear ((W)w);
724 if (!ev_is_active (w))
725 return;
726
727 if (w->active < timercnt--)
728 {
729 timers [w->active - 1] = timers [timercnt];
730 downheap ((WT *)timers, timercnt, w->active - 1);
731 }
732
733 w->at = w->repeat;
734
735 ev_stop ((W)w);
736}
737
738void
739evtimer_again (struct ev_timer *w)
740{
741 if (ev_is_active (w))
742 {
743 if (w->repeat)
744 {
745 w->at = now + w->repeat;
746 downheap ((WT *)timers, timercnt, w->active - 1);
747 }
748 else
749 evtimer_stop (w);
750 }
751 else if (w->repeat)
752 evtimer_start (w);
753}
754
755void
756evperiodic_start (struct ev_periodic *w)
757{
758 if (ev_is_active (w))
759 return;
760
761 assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
762
763 /* this formula differs from the one in periodic_reify because we do not always round up */
764 if (w->interval)
765 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
766
767 ev_start ((W)w, ++periodiccnt);
768 array_needsize (periodics, periodicmax, periodiccnt, );
769 periodics [periodiccnt - 1] = w;
770 upheap ((WT *)periodics, periodiccnt - 1);
771}
772
773void
774evperiodic_stop (struct ev_periodic *w)
775{
776 ev_clear ((W)w);
777 if (!ev_is_active (w))
778 return;
779
780 if (w->active < periodiccnt--)
781 {
782 periodics [w->active - 1] = periodics [periodiccnt];
783 downheap ((WT *)periodics, periodiccnt, w->active - 1);
784 }
785
786 ev_stop ((W)w);
787}
788
789void
790evsignal_start (struct ev_signal *w)
791{
792 if (ev_is_active (w))
793 return;
794
795 ev_start ((W)w, 1);
796 array_needsize (signals, signalmax, w->signum, signals_init);
797 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
798
799 if (!w->next)
800 {
801 struct sigaction sa;
802 sa.sa_handler = sighandler;
803 sigfillset (&sa.sa_mask);
804 sa.sa_flags = 0;
805 sigaction (w->signum, &sa, 0);
806 }
807}
808
809void
810evsignal_stop (struct ev_signal *w)
811{
812 ev_clear ((W)w);
813 if (!ev_is_active (w))
814 return;
815
816 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
817 ev_stop ((W)w);
818
819 if (!signals [w->signum - 1].head)
820 signal (w->signum, SIG_DFL);
821}
822
823void evidle_start (struct ev_idle *w)
824{
825 if (ev_is_active (w))
826 return;
827
828 ev_start ((W)w, ++idlecnt);
829 array_needsize (idles, idlemax, idlecnt, );
830 idles [idlecnt - 1] = w;
831}
832
833void evidle_stop (struct ev_idle *w)
834{
835 ev_clear ((W)w);
836 if (ev_is_active (w))
837 return;
838
839 idles [w->active - 1] = idles [--idlecnt];
840 ev_stop ((W)w);
841}
842
843void evprepare_start (struct ev_prepare *w)
844{
845 if (ev_is_active (w))
846 return;
847
848 ev_start ((W)w, ++preparecnt);
849 array_needsize (prepares, preparemax, preparecnt, );
850 prepares [preparecnt - 1] = w;
851}
852
853void evprepare_stop (struct ev_prepare *w)
854{
855 ev_clear ((W)w);
856 if (ev_is_active (w))
857 return;
858
859 prepares [w->active - 1] = prepares [--preparecnt];
860 ev_stop ((W)w);
861}
862
863void evcheck_start (struct ev_check *w)
864{
865 if (ev_is_active (w))
866 return;
867
868 ev_start ((W)w, ++checkcnt);
869 array_needsize (checks, checkmax, checkcnt, );
870 checks [checkcnt - 1] = w;
871}
872
873void evcheck_stop (struct ev_check *w)
874{
875 ev_clear ((W)w);
876 if (ev_is_active (w))
877 return;
878
879 checks [w->active - 1] = checks [--checkcnt];
880 ev_stop ((W)w);
881}
882
883/*****************************************************************************/
884
885struct ev_once 3570struct ev_once
886{ 3571{
887 struct ev_io io; 3572 ev_io io;
888 struct ev_timer to; 3573 ev_timer to;
889 void (*cb)(int revents, void *arg); 3574 void (*cb)(int revents, void *arg);
890 void *arg; 3575 void *arg;
891}; 3576};
892 3577
893static void 3578static void
894once_cb (struct ev_once *once, int revents) 3579once_cb (EV_P_ struct ev_once *once, int revents)
895{ 3580{
896 void (*cb)(int revents, void *arg) = once->cb; 3581 void (*cb)(int revents, void *arg) = once->cb;
897 void *arg = once->arg; 3582 void *arg = once->arg;
898 3583
899 evio_stop (&once->io); 3584 ev_io_stop (EV_A_ &once->io);
900 evtimer_stop (&once->to); 3585 ev_timer_stop (EV_A_ &once->to);
901 free (once); 3586 ev_free (once);
902 3587
903 cb (revents, arg); 3588 cb (revents, arg);
904} 3589}
905 3590
906static void 3591static void
907once_cb_io (struct ev_io *w, int revents) 3592once_cb_io (EV_P_ ev_io *w, int revents)
908{ 3593{
909 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents); 3594 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3595
3596 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
910} 3597}
911 3598
912static void 3599static void
913once_cb_to (struct ev_timer *w, int revents) 3600once_cb_to (EV_P_ ev_timer *w, int revents)
914{ 3601{
915 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents); 3602 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
916}
917 3603
3604 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3605}
3606
918void 3607void
919ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) 3608ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
920{ 3609{
921 struct ev_once *once = malloc (sizeof (struct ev_once)); 3610 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
922 3611
923 if (!once) 3612 if (expect_false (!once))
924 cb (EV_ERROR, arg); 3613 {
925 else 3614 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3615 return;
926 { 3616 }
3617
927 once->cb = cb; 3618 once->cb = cb;
928 once->arg = arg; 3619 once->arg = arg;
929 3620
930 evw_init (&once->io, once_cb_io); 3621 ev_init (&once->io, once_cb_io);
931
932 if (fd >= 0) 3622 if (fd >= 0)
3623 {
3624 ev_io_set (&once->io, fd, events);
3625 ev_io_start (EV_A_ &once->io);
3626 }
3627
3628 ev_init (&once->to, once_cb_to);
3629 if (timeout >= 0.)
3630 {
3631 ev_timer_set (&once->to, timeout, 0.);
3632 ev_timer_start (EV_A_ &once->to);
3633 }
3634}
3635
3636/*****************************************************************************/
3637
3638#if EV_WALK_ENABLE
3639void
3640ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3641{
3642 int i, j;
3643 ev_watcher_list *wl, *wn;
3644
3645 if (types & (EV_IO | EV_EMBED))
3646 for (i = 0; i < anfdmax; ++i)
3647 for (wl = anfds [i].head; wl; )
933 { 3648 {
934 evio_set (&once->io, fd, events); 3649 wn = wl->next;
935 evio_start (&once->io); 3650
3651#if EV_EMBED_ENABLE
3652 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3653 {
3654 if (types & EV_EMBED)
3655 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3656 }
3657 else
3658#endif
3659#if EV_USE_INOTIFY
3660 if (ev_cb ((ev_io *)wl) == infy_cb)
3661 ;
3662 else
3663#endif
3664 if ((ev_io *)wl != &pipe_w)
3665 if (types & EV_IO)
3666 cb (EV_A_ EV_IO, wl);
3667
3668 wl = wn;
936 } 3669 }
937 3670
938 evw_init (&once->to, once_cb_to); 3671 if (types & (EV_TIMER | EV_STAT))
939 3672 for (i = timercnt + HEAP0; i-- > HEAP0; )
940 if (timeout >= 0.) 3673#if EV_STAT_ENABLE
3674 /*TODO: timer is not always active*/
3675 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
941 { 3676 {
942 evtimer_set (&once->to, timeout, 0.); 3677 if (types & EV_STAT)
943 evtimer_start (&once->to); 3678 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
944 } 3679 }
945 } 3680 else
946} 3681#endif
3682 if (types & EV_TIMER)
3683 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
947 3684
948/*****************************************************************************/ 3685#if EV_PERIODIC_ENABLE
3686 if (types & EV_PERIODIC)
3687 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3688 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3689#endif
949 3690
950#if 0 3691#if EV_IDLE_ENABLE
3692 if (types & EV_IDLE)
3693 for (j = NUMPRI; i--; )
3694 for (i = idlecnt [j]; i--; )
3695 cb (EV_A_ EV_IDLE, idles [j][i]);
3696#endif
951 3697
952struct ev_io wio; 3698#if EV_FORK_ENABLE
3699 if (types & EV_FORK)
3700 for (i = forkcnt; i--; )
3701 if (ev_cb (forks [i]) != embed_fork_cb)
3702 cb (EV_A_ EV_FORK, forks [i]);
3703#endif
953 3704
954static void 3705#if EV_ASYNC_ENABLE
955sin_cb (struct ev_io *w, int revents) 3706 if (types & EV_ASYNC)
956{ 3707 for (i = asynccnt; i--; )
957 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); 3708 cb (EV_A_ EV_ASYNC, asyncs [i]);
958} 3709#endif
959 3710
960static void 3711 if (types & EV_PREPARE)
961ocb (struct ev_timer *w, int revents) 3712 for (i = preparecnt; i--; )
962{ 3713#if EV_EMBED_ENABLE
963 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); 3714 if (ev_cb (prepares [i]) != embed_prepare_cb)
964 evtimer_stop (w); 3715#endif
965 evtimer_start (w); 3716 cb (EV_A_ EV_PREPARE, prepares [i]);
966}
967 3717
968static void 3718 if (types & EV_CHECK)
969scb (struct ev_signal *w, int revents) 3719 for (i = checkcnt; i--; )
970{ 3720 cb (EV_A_ EV_CHECK, checks [i]);
971 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
972 evio_stop (&wio);
973 evio_start (&wio);
974}
975 3721
976static void 3722 if (types & EV_SIGNAL)
977gcb (struct ev_signal *w, int revents)
978{
979 fprintf (stderr, "generic %x\n", revents);
980
981}
982
983int main (void)
984{
985 ev_init (0);
986
987 evio_init (&wio, sin_cb, 0, EV_READ);
988 evio_start (&wio);
989
990 struct ev_timer t[10000];
991
992#if 0
993 int i;
994 for (i = 0; i < 10000; ++i) 3723 for (i = 0; i < EV_NSIG - 1; ++i)
995 { 3724 for (wl = signals [i].head; wl; )
996 struct ev_timer *w = t + i; 3725 {
997 evw_init (w, ocb, i); 3726 wn = wl->next;
998 evtimer_init_abs (w, ocb, drand48 (), 0.99775533); 3727 cb (EV_A_ EV_SIGNAL, wl);
999 evtimer_start (w); 3728 wl = wn;
1000 if (drand48 () < 0.5) 3729 }
1001 evtimer_stop (w);
1002 }
1003#endif
1004 3730
1005 struct ev_timer t1; 3731 if (types & EV_CHILD)
1006 evtimer_init (&t1, ocb, 5, 10); 3732 for (i = EV_PID_HASHSIZE; i--; )
1007 evtimer_start (&t1); 3733 for (wl = childs [i]; wl; )
1008 3734 {
1009 struct ev_signal sig; 3735 wn = wl->next;
1010 evsignal_init (&sig, scb, SIGQUIT); 3736 cb (EV_A_ EV_CHILD, wl);
1011 evsignal_start (&sig); 3737 wl = wn;
1012 3738 }
1013 struct ev_check cw; 3739/* EV_STAT 0x00001000 /* stat data changed */
1014 evcheck_init (&cw, gcb); 3740/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
1015 evcheck_start (&cw);
1016
1017 struct ev_idle iw;
1018 evidle_init (&iw, gcb);
1019 evidle_start (&iw);
1020
1021 ev_loop (0);
1022
1023 return 0;
1024} 3741}
1025
1026#endif 3742#endif
1027 3743
3744#if EV_MULTIPLICITY
3745 #include "ev_wrap.h"
3746#endif
1028 3747
3748#ifdef __cplusplus
3749}
3750#endif
1029 3751
1030

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