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Comparing libev/ev.c (file contents):
Revision 1.1 by root, Tue Oct 30 20:59:31 2007 UTC vs.
Revision 1.66 by root, Sun Nov 4 23:30:53 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#ifndef EV_STANDALONE
		32	# include "config.h"
		33
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
		56
1	#include <math.h>	57	#include <math.h>
2	#include <stdlib.h>	58	#include <stdlib.h>
		59	#include <unistd.h>
		60	#include <fcntl.h>
		61	#include <signal.h>
		62	#include <stddef.h>
3		63
4	#include <stdio.h>	64	#include <stdio.h>
5		65
		66	#include <assert.h>
6	#include <errno.h>	67	#include <errno.h>
		68	#include <sys/types.h>
		69	#ifndef WIN32
		70	# include <sys/wait.h>
		71	#endif
7	#include <sys/time.h>	72	#include <sys/time.h>
8	#include <time.h>	73	#include <time.h>
9		74
		75	/**/
		76
		77	#ifndef EV_USE_MONOTONIC
		78	# define EV_USE_MONOTONIC 1
		79	#endif
		80
		81	#ifndef EV_USE_SELECT
		82	# define EV_USE_SELECT 1
		83	#endif
		84
		85	#ifndef EV_USE_POLL
		86	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		87	#endif
		88
		89	#ifndef EV_USE_EPOLL
		90	# define EV_USE_EPOLL 0
		91	#endif
		92
		93	#ifndef EV_USE_KQUEUE
		94	# define EV_USE_KQUEUE 0
		95	#endif
		96
		97	#ifndef EV_USE_WIN32
		98	# ifdef WIN32
		99	# define EV_USE_WIN32 1
		100	# else
		101	# define EV_USE_WIN32 0
		102	# endif
		103	#endif
		104
		105	#ifndef EV_USE_REALTIME
		106	# define EV_USE_REALTIME 1
		107	#endif
		108
		109	/**/
		110
10	#ifdef CLOCK_MONOTONIC	111	#ifndef CLOCK_MONOTONIC
		112	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	113	# define EV_USE_MONOTONIC 0
12	#endif	114	#endif
13		115
14	#define HAVE_EPOLL 1	116	#ifndef CLOCK_REALTIME
		117	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	118	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	119	#endif
17		120
18	#define MAX_BLOCKTIME 60.	121	/**/
		122
		123	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		124	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		125	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		126	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
19		127
20	#include "ev.h"	128	#include "ev.h"
21		129
		130	#if __GNUC__ >= 3
		131	# define expect(expr,value) __builtin_expect ((expr),(value))
		132	# define inline inline
		133	#else
		134	# define expect(expr,value) (expr)
		135	# define inline static
		136	#endif
		137
		138	#define expect_false(expr) expect ((expr) != 0, 0)
		139	#define expect_true(expr) expect ((expr) != 0, 1)
		140
		141	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		142	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		143
22	struct ev_watcher {	144	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);	145	typedef struct ev_watcher_list *WL;
		146	typedef struct ev_watcher_time *WT;
		147
		148	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		149
		150	/*****************************************************************************/
		151
		152	typedef struct
		153	{
		154	struct ev_watcher_list *head;
		155	unsigned char events;
		156	unsigned char reify;
		157	} ANFD;
		158
		159	typedef struct
		160	{
		161	W w;
		162	int events;
		163	} ANPENDING;
		164
		165	#if EV_MULTIPLICITY
		166
		167	struct ev_loop
		168	{
		169	# define VAR(name,decl) decl;
		170	# include "ev_vars.h"
24	};	171	};
		172	# undef VAR
		173	# include "ev_wrap.h"
25		174
26	struct ev_watcher_list {	175	#else
27	EV_WATCHER_LIST (ev_watcher_list);
28	};
29		176
30	ev_tstamp ev_now;	177	# define VAR(name,decl) static decl;
31	int ev_method;	178	# include "ev_vars.h"
		179	# undef VAR
32		180
33	static int have_monotonic; /* runtime */	181	#endif
34		182
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	183	/*****************************************************************************/
36	static void (*method_reify)(void);
37	static void (*method_poll)(ev_tstamp timeout);
38		184
39	ev_tstamp	185	inline ev_tstamp
40	ev_time (void)	186	ev_time (void)
41	{	187	{
42	#if HAVE_REALTIME	188	#if EV_USE_REALTIME
43	struct timespec ts;	189	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	190	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	191	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	192	#else
47	struct timeval tv;	193	struct timeval tv;
48	gettimeofday (&tv, 0);	194	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	195	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	196	#endif
51	}	197	}
52		198
53	static ev_tstamp	199	inline ev_tstamp
54	get_clock (void)	200	get_clock (void)
55	{	201	{
56	#if HAVE_MONOTONIC	202	#if EV_USE_MONOTONIC
57	if (have_monotonic)	203	if (expect_true (have_monotonic))
58	{	204	{
59	struct timespec ts;	205	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	206	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	207	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	208	}
63	#endif	209	#endif
64		210
65	return ev_time ();	211	return ev_time ();
66	}	212	}
67		213
		214	ev_tstamp
		215	ev_now (EV_P)
		216	{
		217	return rt_now;
		218	}
		219
		220	#define array_roundsize(base,n) ((n) | 4 & ~3)
		221
68	#define array_needsize(base,cur,cnt,init) \	222	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	223	if (expect_false ((cnt) > cur)) \
70	{ \	224	{ \
71	int newcnt = cur; \	225	int newcnt = cur; \
72	do \	226	do \
73	{ \	227	{ \
74	newcnt += (newcnt >> 1) + 16; \	228	newcnt = array_roundsize (base, newcnt << 1); \
75	} \	229	} \
76	while ((cnt) > newcnt); \	230	while ((cnt) > newcnt); \
77	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	231	\
78	base = realloc (base, sizeof (*base) * (newcnt)); \	232	base = realloc (base, sizeof (*base) * (newcnt)); \
79	init (base + cur, newcnt - cur); \	233	init (base + cur, newcnt - cur); \
80	cur = newcnt; \	234	cur = newcnt; \
81	}	235	}
82		236
83	typedef struct	237	#define array_free(stem, idx) \
84	{	238	free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
85	struct ev_io *head;
86	unsigned char wev, rev; /* want, received event set */
87	} ANFD;
88		239
89	static ANFD *anfds;	240	/*****************************************************************************/
90	static int anfdmax;
91
92	static int *fdchanges;
93	static int fdchangemax, fdchangecnt;
94		241
95	static void	242	static void
96	anfds_init (ANFD *base, int count)	243	anfds_init (ANFD *base, int count)
97	{	244	{
98	while (count--)	245	while (count--)
99	{	246	{
100	base->head = 0;	247	base->head = 0;
101	base->wev = base->rev = EV_NONE;	248	base->events = EV_NONE;
		249	base->reify = 0;
		250
102	++base;	251	++base;
103	}	252	}
104	}	253	}
105		254
106	typedef struct
107	{
108	struct ev_watcher *w;
109	int events;
110	} ANPENDING;
111
112	static ANPENDING *pendings;
113	static int pendingmax, pendingcnt;
114
115	static void	255	static void
116	event (struct ev_watcher *w, int events)	256	event (EV_P_ W w, int events)
117	{	257	{
		258	if (w->pending)
		259	{
		260	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		261	return;
		262	}
		263
118	w->pending = ++pendingcnt;	264	w->pending = ++pendingcnt [ABSPRI (w)];
119	array_needsize (pendings, pendingmax, pendingcnt, );	265	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
120	pendings [pendingcnt - 1].w = w;	266	pendings [ABSPRI (w)][w->pending - 1].w = w;
121	pendings [pendingcnt - 1].events = events;	267	pendings [ABSPRI (w)][w->pending - 1].events = events;
122	}	268	}
123		269
124	static void	270	static void
		271	queue_events (EV_P_ W *events, int eventcnt, int type)
		272	{
		273	int i;
		274
		275	for (i = 0; i < eventcnt; ++i)
		276	event (EV_A_ events [i], type);
		277	}
		278
		279	static void
125	fd_event (int fd, int events)	280	fd_event (EV_P_ int fd, int events)
126	{	281	{
127	ANFD *anfd = anfds + fd;	282	ANFD *anfd = anfds + fd;
128	struct ev_io *w;	283	struct ev_io *w;
129		284
130	for (w = anfd->head; w; w = w->next)	285	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
131	{	286	{
132	int ev = w->events & events;	287	int ev = w->events & events;
133		288
134	if (ev)	289	if (ev)
135	event ((struct ev_watcher *)w, ev);	290	event (EV_A_ (W)w, ev);
		291	}
		292	}
		293
		294	/*****************************************************************************/
		295
		296	static void
		297	fd_reify (EV_P)
		298	{
		299	int i;
		300
		301	for (i = 0; i < fdchangecnt; ++i)
		302	{
		303	int fd = fdchanges [i];
		304	ANFD *anfd = anfds + fd;
		305	struct ev_io *w;
		306
		307	int events = 0;
		308
		309	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		310	events |= w->events;
		311
		312	anfd->reify = 0;
		313
		314	method_modify (EV_A_ fd, anfd->events, events);
		315	anfd->events = events;
		316	}
		317
		318	fdchangecnt = 0;
		319	}
		320
		321	static void
		322	fd_change (EV_P_ int fd)
		323	{
		324	if (anfds [fd].reify || fdchangecnt < 0)
		325	return;
		326
		327	anfds [fd].reify = 1;
		328
		329	++fdchangecnt;
		330	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		331	fdchanges [fdchangecnt - 1] = fd;
		332	}
		333
		334	static void
		335	fd_kill (EV_P_ int fd)
		336	{
		337	struct ev_io *w;
		338
		339	while ((w = (struct ev_io *)anfds [fd].head))
		340	{
		341	ev_io_stop (EV_A_ w);
		342	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		343	}
		344	}
		345
		346	/* called on EBADF to verify fds */
		347	static void
		348	fd_ebadf (EV_P)
		349	{
		350	int fd;
		351
		352	for (fd = 0; fd < anfdmax; ++fd)
		353	if (anfds [fd].events)
		354	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		355	fd_kill (EV_A_ fd);
		356	}
		357
		358	/* called on ENOMEM in select/poll to kill some fds and retry */
		359	static void
		360	fd_enomem (EV_P)
		361	{
		362	int fd;
		363
		364	for (fd = anfdmax; fd--; )
		365	if (anfds [fd].events)
		366	{
		367	close (fd);
		368	fd_kill (EV_A_ fd);
		369	return;
136	}	370	}
137	}	371	}
138		372
139	static struct ev_timer **timers;	373	/* susually called after fork if method needs to re-arm all fds from scratch */
140	static int timermax, timercnt;
141
142	static void	374	static void
143	upheap (int k)	375	fd_rearm_all (EV_P)
144	{	376	{
145	struct ev_timer *w = timers [k];	377	int fd;
146		378
		379	/* this should be highly optimised to not do anything but set a flag */
		380	for (fd = 0; fd < anfdmax; ++fd)
		381	if (anfds [fd].events)
		382	{
		383	anfds [fd].events = 0;
		384	fd_change (EV_A_ fd);
		385	}
		386	}
		387
		388	/*****************************************************************************/
		389
		390	static void
		391	upheap (WT *heap, int k)
		392	{
		393	WT w = heap [k];
		394
147	while (k && timers [k >> 1]->at > w->at)	395	while (k && heap [k >> 1]->at > w->at)
148	{	396	{
149	timers [k] = timers [k >> 1];	397	heap [k] = heap [k >> 1];
150	timers [k]->active = k + 1;	398	((W)heap [k])->active = k + 1;
151	k >>= 1;	399	k >>= 1;
152	}	400	}
153		401
154	timers [k] = w;	402	heap [k] = w;
155	timers [k]->active = k + 1;	403	((W)heap [k])->active = k + 1;
156		404
157	}	405	}
158		406
159	static void	407	static void
160	downheap (int k)	408	downheap (WT *heap, int N, int k)
161	{	409	{
162	struct ev_timer *w = timers [k];	410	WT w = heap [k];
163		411
164	while (k <= (timercnt >> 1))	412	while (k < (N >> 1))
165	{	413	{
166	int j = k << 1;	414	int j = k << 1;
167		415
168	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	416	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
169	++j;	417	++j;
170		418
171	if (w->at <= timers [j]->at)	419	if (w->at <= heap [j]->at)
172	break;	420	break;
173		421
174	timers [k] = timers [j];	422	heap [k] = heap [j];
175	timers [k]->active = k;	423	((W)heap [k])->active = k + 1;
176	k = j;	424	k = j;
177	}	425	}
178		426
179	timers [k] = w;	427	heap [k] = w;
180	timers [k]->active = k + 1;	428	((W)heap [k])->active = k + 1;
181	}	429	}
182		430
183	static struct ev_signal **signals;	431	/*****************************************************************************/
		432
		433	typedef struct
		434	{
		435	struct ev_watcher_list *head;
		436	sig_atomic_t volatile gotsig;
		437	} ANSIG;
		438
		439	static ANSIG *signals;
184	static int signalmax, signalcnt;	440	static int signalmax;
185		441
		442	static int sigpipe [2];
		443	static sig_atomic_t volatile gotsig;
		444	static struct ev_io sigev;
		445
186	static void	446	static void
187	signals_init (struct ev_signal **base, int count)	447	signals_init (ANSIG *base, int count)
188	{	448	{
189	while (count--)	449	while (count--)
190	*base++ = 0;	450	{
191	}	451	base->head = 0;
		452	base->gotsig = 0;
192		453
		454	++base;
		455	}
		456	}
		457
		458	static void
		459	sighandler (int signum)
		460	{
		461	signals [signum - 1].gotsig = 1;
		462
		463	if (!gotsig)
		464	{
		465	int old_errno = errno;
		466	gotsig = 1;
		467	write (sigpipe [1], &signum, 1);
		468	errno = old_errno;
		469	}
		470	}
		471
		472	static void
		473	sigcb (EV_P_ struct ev_io *iow, int revents)
		474	{
		475	struct ev_watcher_list *w;
		476	int signum;
		477
		478	read (sigpipe [0], &revents, 1);
		479	gotsig = 0;
		480
		481	for (signum = signalmax; signum--; )
		482	if (signals [signum].gotsig)
		483	{
		484	signals [signum].gotsig = 0;
		485
		486	for (w = signals [signum].head; w; w = w->next)
		487	event (EV_A_ (W)w, EV_SIGNAL);
		488	}
		489	}
		490
		491	static void
		492	siginit (EV_P)
		493	{
		494	#ifndef WIN32
		495	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		496	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		497
		498	/* rather than sort out wether we really need nb, set it */
		499	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		500	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		501	#endif
		502
		503	ev_io_set (&sigev, sigpipe [0], EV_READ);
		504	ev_io_start (EV_A_ &sigev);
		505	ev_unref (EV_A); /* child watcher should not keep loop alive */
		506	}
		507
		508	/*****************************************************************************/
		509
		510	#ifndef WIN32
		511
		512	static struct ev_child *childs [PID_HASHSIZE];
		513	static struct ev_signal childev;
		514
		515	#ifndef WCONTINUED
		516	# define WCONTINUED 0
		517	#endif
		518
		519	static void
		520	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		521	{
		522	struct ev_child *w;
		523
		524	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		525	if (w->pid == pid || !w->pid)
		526	{
		527	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		528	w->rpid = pid;
		529	w->rstatus = status;
		530	event (EV_A_ (W)w, EV_CHILD);
		531	}
		532	}
		533
		534	static void
		535	childcb (EV_P_ struct ev_signal *sw, int revents)
		536	{
		537	int pid, status;
		538
		539	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		540	{
		541	/* make sure we are called again until all childs have been reaped */
		542	event (EV_A_ (W)sw, EV_SIGNAL);
		543
		544	child_reap (EV_A_ sw, pid, pid, status);
		545	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		546	}
		547	}
		548
		549	#endif
		550
		551	/*****************************************************************************/
		552
		553	#if EV_USE_KQUEUE
		554	# include "ev_kqueue.c"
		555	#endif
193	#if HAVE_EPOLL	556	#if EV_USE_EPOLL
194	# include "ev_epoll.c"	557	# include "ev_epoll.c"
195	#endif	558	#endif
		559	#if EV_USE_POLL
		560	# include "ev_poll.c"
		561	#endif
196	#if HAVE_SELECT	562	#if EV_USE_SELECT
197	# include "ev_select.c"	563	# include "ev_select.c"
198	#endif	564	#endif
199		565
200	int ev_init (int flags)	566	int
		567	ev_version_major (void)
201	{	568	{
		569	return EV_VERSION_MAJOR;
		570	}
		571
		572	int
		573	ev_version_minor (void)
		574	{
		575	return EV_VERSION_MINOR;
		576	}
		577
		578	/* return true if we are running with elevated privileges and should ignore env variables */
		579	static int
		580	enable_secure (void)
		581	{
		582	#ifdef WIN32
		583	return 0;
		584	#else
		585	return getuid () != geteuid ()
		586	|| getgid () != getegid ();
		587	#endif
		588	}
		589
		590	int
		591	ev_method (EV_P)
		592	{
		593	return method;
		594	}
		595
		596	static void
		597	loop_init (EV_P_ int methods)
		598	{
		599	if (!method)
		600	{
202	#if HAVE_MONOTONIC	601	#if EV_USE_MONOTONIC
203	{	602	{
204	struct timespec ts;	603	struct timespec ts;
205	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	604	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
206	have_monotonic = 1;	605	have_monotonic = 1;
207	}	606	}
208	#endif	607	#endif
209		608
210	ev_now = ev_time ();	609	rt_now = ev_time ();
		610	mn_now = get_clock ();
		611	now_floor = mn_now;
		612	rtmn_diff = rt_now - mn_now;
211		613
		614	if (methods == EVMETHOD_AUTO)
		615	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		616	methods = atoi (getenv ("LIBEV_METHODS"));
		617	else
		618	methods = EVMETHOD_ANY;
		619
		620	method = 0;
		621	#if EV_USE_WIN32
		622	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		623	#endif
		624	#if EV_USE_KQUEUE
		625	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		626	#endif
212	#if HAVE_EPOLL	627	#if EV_USE_EPOLL
213	if (epoll_init (flags))	628	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
214	return ev_method;
215	#endif	629	#endif
		630	#if EV_USE_POLL
		631	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		632	#endif
216	#if HAVE_SELECT	633	#if EV_USE_SELECT
217	if (select_init (flags))	634	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
218	return ev_method;
219	#endif	635	#endif
220		636	}
221	ev_method = EVMETHOD_NONE;
222	return ev_method;
223	}	637	}
224		638
225	void ev_prefork (void)	639	void
226	{	640	loop_destroy (EV_P)
227	}
228
229	void ev_postfork_parent (void)
230	{
231	}
232
233	void ev_postfork_child (void)
234	{
235	#if HAVE_EPOLL
236	epoll_postfork_child ();
237	#endif
238	}
239
240	static void
241	call_pending ()
242	{	641	{
243	int i;	642	int i;
244		643
245	for (i = 0; i < pendingcnt; ++i)	644	#if EV_USE_WIN32
246	{	645	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
247	ANPENDING *p = pendings + i;	646	#endif
		647	#if EV_USE_KQUEUE
		648	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		649	#endif
		650	#if EV_USE_EPOLL
		651	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		652	#endif
		653	#if EV_USE_POLL
		654	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		655	#endif
		656	#if EV_USE_SELECT
		657	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		658	#endif
248		659
249	if (p->w)	660	for (i = NUMPRI; i--; )
		661	array_free (pending, [i]);
		662
		663	array_free (fdchange, );
		664	array_free (timer, );
		665	array_free (periodic, );
		666	array_free (idle, );
		667	array_free (prepare, );
		668	array_free (check, );
		669
		670	method = 0;
		671	/*TODO*/
		672	}
		673
		674	void
		675	loop_fork (EV_P)
		676	{
		677	/*TODO*/
		678	#if EV_USE_EPOLL
		679	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		680	#endif
		681	#if EV_USE_KQUEUE
		682	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		683	#endif
		684	}
		685
		686	#if EV_MULTIPLICITY
		687	struct ev_loop *
		688	ev_loop_new (int methods)
		689	{
		690	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		691
		692	loop_init (EV_A_ methods);
		693
		694	if (ev_method (EV_A))
		695	return loop;
		696
		697	return 0;
		698	}
		699
		700	void
		701	ev_loop_destroy (EV_P)
		702	{
		703	loop_destroy (EV_A);
		704	free (loop);
		705	}
		706
		707	void
		708	ev_loop_fork (EV_P)
		709	{
		710	loop_fork (EV_A);
		711	}
		712
		713	#endif
		714
		715	#if EV_MULTIPLICITY
		716	struct ev_loop default_loop_struct;
		717	static struct ev_loop *default_loop;
		718
		719	struct ev_loop *
		720	#else
		721	static int default_loop;
		722
		723	int
		724	#endif
		725	ev_default_loop (int methods)
		726	{
		727	if (sigpipe [0] == sigpipe [1])
		728	if (pipe (sigpipe))
		729	return 0;
		730
		731	if (!default_loop)
		732	{
		733	#if EV_MULTIPLICITY
		734	struct ev_loop *loop = default_loop = &default_loop_struct;
		735	#else
		736	default_loop = 1;
		737	#endif
		738
		739	loop_init (EV_A_ methods);
		740
		741	if (ev_method (EV_A))
250	{	742	{
251	p->w->pending = 0;	743	ev_watcher_init (&sigev, sigcb);
252	p->w->cb (p->w, p->events);	744	ev_set_priority (&sigev, EV_MAXPRI);
		745	siginit (EV_A);
		746
		747	#ifndef WIN32
		748	ev_signal_init (&childev, childcb, SIGCHLD);
		749	ev_set_priority (&childev, EV_MAXPRI);
		750	ev_signal_start (EV_A_ &childev);
		751	ev_unref (EV_A); /* child watcher should not keep loop alive */
		752	#endif
253	}	753	}
		754	else
		755	default_loop = 0;
		756	}
		757
		758	return default_loop;
		759	}
		760
		761	void
		762	ev_default_destroy (void)
		763	{
		764	#if EV_MULTIPLICITY
		765	struct ev_loop *loop = default_loop;
		766	#endif
		767
		768	ev_ref (EV_A); /* child watcher */
		769	ev_signal_stop (EV_A_ &childev);
		770
		771	ev_ref (EV_A); /* signal watcher */
		772	ev_io_stop (EV_A_ &sigev);
		773
		774	close (sigpipe [0]); sigpipe [0] = 0;
		775	close (sigpipe [1]); sigpipe [1] = 0;
		776
		777	loop_destroy (EV_A);
		778	}
		779
		780	void
		781	ev_default_fork (void)
		782	{
		783	#if EV_MULTIPLICITY
		784	struct ev_loop *loop = default_loop;
		785	#endif
		786
		787	loop_fork (EV_A);
		788
		789	ev_io_stop (EV_A_ &sigev);
		790	close (sigpipe [0]);
		791	close (sigpipe [1]);
		792	pipe (sigpipe);
		793
		794	ev_ref (EV_A); /* signal watcher */
		795	siginit (EV_A);
		796	}
		797
		798	/*****************************************************************************/
		799
		800	static void
		801	call_pending (EV_P)
		802	{
		803	int pri;
		804
		805	for (pri = NUMPRI; pri--; )
		806	while (pendingcnt [pri])
		807	{
		808	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		809
		810	if (p->w)
		811	{
		812	p->w->pending = 0;
		813	p->w->cb (EV_A_ p->w, p->events);
		814	}
254	}	815	}
255
256	pendingcnt = 0;
257	}	816	}
258		817
259	static void	818	static void
260	timer_reify (void)	819	timers_reify (EV_P)
261	{	820	{
262	while (timercnt && timers [0]->at <= ev_now)	821	while (timercnt && ((WT)timers [0])->at <= mn_now)
263	{	822	{
264	struct ev_timer *w = timers [0];	823	struct ev_timer *w = timers [0];
265		824
		825	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		826
266	/* first reschedule timer */	827	/* first reschedule or stop timer */
267	if (w->repeat)	828	if (w->repeat)
268	{	829	{
269	fprintf (stderr, "a %f now %f repeat %f, %f\n", w->at, ev_now, w->repeat, w->repeat *1e30);//D	830	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
270	if (w->is_abs)
271	w->at += floor ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
272	else
273	w->at = ev_now + w->repeat;	831	((WT)w)->at = mn_now + w->repeat;
274		832	downheap ((WT *)timers, timercnt, 0);
275	fprintf (stderr, "b %f\n", w->at);//D
276
277	downheap (0);
278	}	833	}
279	else	834	else
280	evtimer_stop (w); /* nonrepeating: stop timer */	835	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
281		836
282	event ((struct ev_watcher *)w, EV_TIMEOUT);	837	event (EV_A_ (W)w, EV_TIMEOUT);
		838	}
		839	}
		840
		841	static void
		842	periodics_reify (EV_P)
		843	{
		844	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
283	}	845	{
284	}	846	struct ev_periodic *w = periodics [0];
285		847
286	int ev_loop_done;	848	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
287		849
		850	/* first reschedule or stop timer */
		851	if (w->interval)
		852	{
		853	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		854	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		855	downheap ((WT *)periodics, periodiccnt, 0);
		856	}
		857	else
		858	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		859
		860	event (EV_A_ (W)w, EV_PERIODIC);
		861	}
		862	}
		863
		864	static void
		865	periodics_reschedule (EV_P)
		866	{
		867	int i;
		868
		869	/* adjust periodics after time jump */
		870	for (i = 0; i < periodiccnt; ++i)
		871	{
		872	struct ev_periodic *w = periodics [i];
		873
		874	if (w->interval)
		875	{
		876	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		877
		878	if (fabs (diff) >= 1e-4)
		879	{
		880	ev_periodic_stop (EV_A_ w);
		881	ev_periodic_start (EV_A_ w);
		882
		883	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		884	}
		885	}
		886	}
		887	}
		888
		889	inline int
		890	time_update_monotonic (EV_P)
		891	{
		892	mn_now = get_clock ();
		893
		894	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		895	{
		896	rt_now = rtmn_diff + mn_now;
		897	return 0;
		898	}
		899	else
		900	{
		901	now_floor = mn_now;
		902	rt_now = ev_time ();
		903	return 1;
		904	}
		905	}
		906
		907	static void
		908	time_update (EV_P)
		909	{
		910	int i;
		911
		912	#if EV_USE_MONOTONIC
		913	if (expect_true (have_monotonic))
		914	{
		915	if (time_update_monotonic (EV_A))
		916	{
		917	ev_tstamp odiff = rtmn_diff;
		918
		919	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		920	{
		921	rtmn_diff = rt_now - mn_now;
		922
		923	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		924	return; /* all is well */
		925
		926	rt_now = ev_time ();
		927	mn_now = get_clock ();
		928	now_floor = mn_now;
		929	}
		930
		931	periodics_reschedule (EV_A);
		932	/* no timer adjustment, as the monotonic clock doesn't jump */
		933	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		934	}
		935	}
		936	else
		937	#endif
		938	{
		939	rt_now = ev_time ();
		940
		941	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		942	{
		943	periodics_reschedule (EV_A);
		944
		945	/* adjust timers. this is easy, as the offset is the same for all */
		946	for (i = 0; i < timercnt; ++i)
		947	((WT)timers [i])->at += rt_now - mn_now;
		948	}
		949
		950	mn_now = rt_now;
		951	}
		952	}
		953
		954	void
		955	ev_ref (EV_P)
		956	{
		957	++activecnt;
		958	}
		959
		960	void
		961	ev_unref (EV_P)
		962	{
		963	--activecnt;
		964	}
		965
		966	static int loop_done;
		967
		968	void
288	int ev_loop (int flags)	969	ev_loop (EV_P_ int flags)
289	{	970	{
290	double block;	971	double block;
291	ev_loop_done = flags & EVLOOP_ONESHOT;	972	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
292		973
293	do	974	do
294	{	975	{
		976	/* queue check watchers (and execute them) */
		977	if (expect_false (preparecnt))
		978	{
		979	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		980	call_pending (EV_A);
		981	}
		982
295	/* update fd-related kernel structures */	983	/* update fd-related kernel structures */
296	method_reify (); fdchangecnt = 0;	984	fd_reify (EV_A);
297		985
298	/* calculate blocking time */	986	/* calculate blocking time */
		987
		988	/* we only need this for !monotonic clockor timers, but as we basically
		989	always have timers, we just calculate it always */
		990	#if EV_USE_MONOTONIC
		991	if (expect_true (have_monotonic))
		992	time_update_monotonic (EV_A);
		993	else
		994	#endif
		995	{
299	ev_now = ev_time ();	996	rt_now = ev_time ();
		997	mn_now = rt_now;
		998	}
300		999
301	if (flags & EVLOOP_NONBLOCK)	1000	if (flags & EVLOOP_NONBLOCK || idlecnt)
302	block = 0.;	1001	block = 0.;
303	else if (!timercnt)
304	block = MAX_BLOCKTIME;
305	else	1002	else
306	{	1003	{
		1004	block = MAX_BLOCKTIME;
		1005
		1006	if (timercnt)
		1007	{
307	block = timers [0]->at - ev_now + method_fudge;	1008	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
		1009	if (block > to) block = to;
		1010	}
		1011
		1012	if (periodiccnt)
		1013	{
		1014	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
		1015	if (block > to) block = to;
		1016	}
		1017
308	if (block < 0.) block = 0.;	1018	if (block < 0.) block = 0.;
309	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
310	}	1019	}
311		1020
312	fprintf (stderr, "block %f\n", block);//D
313	method_poll (block);	1021	method_poll (EV_A_ block);
314		1022
		1023	/* update rt_now, do magic */
		1024	time_update (EV_A);
		1025
315	/* put pending timers into pendign queue and reschedule them */	1026	/* queue pending timers and reschedule them */
316	timer_reify ();	1027	timers_reify (EV_A); /* relative timers called last */
		1028	periodics_reify (EV_A); /* absolute timers called first */
317		1029
318	ev_now = ev_time ();	1030	/* queue idle watchers unless io or timers are pending */
		1031	if (!pendingcnt)
		1032	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1033
		1034	/* queue check watchers, to be executed first */
		1035	if (checkcnt)
		1036	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1037
319	call_pending ();	1038	call_pending (EV_A);
320	}	1039	}
321	while (!ev_loop_done);	1040	while (activecnt && !loop_done);
322	}
323		1041
324	static void	1042	if (loop_done != 2)
325	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1043	loop_done = 0;
		1044	}
		1045
		1046	void
		1047	ev_unloop (EV_P_ int how)
		1048	{
		1049	loop_done = how;
		1050	}
		1051
		1052	/*****************************************************************************/
		1053
		1054	inline void
		1055	wlist_add (WL *head, WL elem)
326	{	1056	{
327	elem->next = *head;	1057	elem->next = *head;
328	*head = elem;	1058	*head = elem;
329	}	1059	}
330		1060
331	static void	1061	inline void
332	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1062	wlist_del (WL *head, WL elem)
333	{	1063	{
334	while (*head)	1064	while (*head)
335	{	1065	{
336	if (*head == elem)	1066	if (*head == elem)
337	{	1067	{
…		…
341		1071
342	head = &(*head)->next;	1072	head = &(*head)->next;
343	}	1073	}
344	}	1074	}
345		1075
346	static void	1076	inline void
347	ev_start (struct ev_watcher *w, int active)	1077	ev_clear_pending (EV_P_ W w)
348	{	1078	{
		1079	if (w->pending)
		1080	{
		1081	pendings [ABSPRI (w)][w->pending - 1].w = 0;
349	w->pending = 0;	1082	w->pending = 0;
		1083	}
		1084	}
		1085
		1086	inline void
		1087	ev_start (EV_P_ W w, int active)
		1088	{
		1089	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1090	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1091
350	w->active = active;	1092	w->active = active;
		1093	ev_ref (EV_A);
351	}	1094	}
352		1095
353	static void	1096	inline void
354	ev_stop (struct ev_watcher *w)	1097	ev_stop (EV_P_ W w)
355	{	1098	{
356	if (w->pending)	1099	ev_unref (EV_A);
357	pendings [w->pending - 1].w = 0;
358
359	w->active = 0;	1100	w->active = 0;
360	/* nop */
361	}	1101	}
362		1102
		1103	/*****************************************************************************/
		1104
363	void	1105	void
364	evio_start (struct ev_io *w)	1106	ev_io_start (EV_P_ struct ev_io *w)
365	{	1107	{
		1108	int fd = w->fd;
		1109
366	if (ev_is_active (w))	1110	if (ev_is_active (w))
367	return;	1111	return;
368		1112
369	int fd = w->fd;	1113	assert (("ev_io_start called with negative fd", fd >= 0));
370		1114
371	ev_start ((struct ev_watcher *)w, 1);	1115	ev_start (EV_A_ (W)w, 1);
372	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1116	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
373	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1117	wlist_add ((WL *)&anfds[fd].head, (WL)w);
374		1118
375	++fdchangecnt;	1119	fd_change (EV_A_ fd);
376	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
377	fdchanges [fdchangecnt - 1] = fd;
378	}	1120	}
379		1121
380	void	1122	void
381	evio_stop (struct ev_io *w)	1123	ev_io_stop (EV_P_ struct ev_io *w)
382	{	1124	{
		1125	ev_clear_pending (EV_A_ (W)w);
383	if (!ev_is_active (w))	1126	if (!ev_is_active (w))
384	return;	1127	return;
385		1128
386	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1129	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
387	ev_stop ((struct ev_watcher *)w);	1130	ev_stop (EV_A_ (W)w);
388		1131
389	++fdchangecnt;	1132	fd_change (EV_A_ w->fd);
390	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
391	fdchanges [fdchangecnt - 1] = w->fd;
392	}	1133	}
393		1134
394	void	1135	void
395	evtimer_start (struct ev_timer *w)	1136	ev_timer_start (EV_P_ struct ev_timer *w)
396	{	1137	{
397	if (ev_is_active (w))	1138	if (ev_is_active (w))
398	return;	1139	return;
399		1140
400	fprintf (stderr, "t1 %f a %d\n", w->at, w->is_abs);//D	1141	((WT)w)->at += mn_now;
401	if (w->is_abs)
402	{
403	if (w->repeat)
404	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
405	}
406	else
407	w->at += ev_now;
408	fprintf (stderr, "t2 %f a %d\n", w->at, w->is_abs);//D
409		1142
410	ev_start ((struct ev_watcher *)w, ++timercnt);	1143	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1144
		1145	ev_start (EV_A_ (W)w, ++timercnt);
411	array_needsize (timers, timermax, timercnt, );	1146	array_needsize (timers, timermax, timercnt, );
412	timers [timercnt - 1] = w;	1147	timers [timercnt - 1] = w;
413	upheap (timercnt - 1);	1148	upheap ((WT *)timers, timercnt - 1);
414	}
415		1149
		1150	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1151	}
		1152
416	void	1153	void
417	evtimer_stop (struct ev_timer *w)	1154	ev_timer_stop (EV_P_ struct ev_timer *w)
418	{	1155	{
		1156	ev_clear_pending (EV_A_ (W)w);
419	if (!ev_is_active (w))	1157	if (!ev_is_active (w))
420	return;	1158	return;
421		1159
		1160	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1161
		1162	if (((W)w)->active < timercnt--)
		1163	{
422	timers [w->active - 1] = timers [--timercnt];	1164	timers [((W)w)->active - 1] = timers [timercnt];
423	downheap (w->active - 1);	1165	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
424	ev_stop ((struct ev_watcher *)w);	1166	}
425	}
426		1167
		1168	((WT)w)->at = w->repeat;
		1169
		1170	ev_stop (EV_A_ (W)w);
		1171	}
		1172
427	void	1173	void
428	evsignal_start (struct ev_signal *w)	1174	ev_timer_again (EV_P_ struct ev_timer *w)
429	{	1175	{
430	if (ev_is_active (w))	1176	if (ev_is_active (w))
431	return;	1177	{
		1178	if (w->repeat)
		1179	{
		1180	((WT)w)->at = mn_now + w->repeat;
		1181	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1182	}
		1183	else
		1184	ev_timer_stop (EV_A_ w);
		1185	}
		1186	else if (w->repeat)
		1187	ev_timer_start (EV_A_ w);
		1188	}
432		1189
433	ev_start ((struct ev_watcher *)w, 1);	1190	void
		1191	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1192	{
		1193	if (ev_is_active (w))
		1194	return;
		1195
		1196	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1197
		1198	/* this formula differs from the one in periodic_reify because we do not always round up */
		1199	if (w->interval)
		1200	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1201
		1202	ev_start (EV_A_ (W)w, ++periodiccnt);
		1203	array_needsize (periodics, periodicmax, periodiccnt, );
		1204	periodics [periodiccnt - 1] = w;
		1205	upheap ((WT *)periodics, periodiccnt - 1);
		1206
		1207	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1208	}
		1209
		1210	void
		1211	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1212	{
		1213	ev_clear_pending (EV_A_ (W)w);
		1214	if (!ev_is_active (w))
		1215	return;
		1216
		1217	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1218
		1219	if (((W)w)->active < periodiccnt--)
		1220	{
		1221	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1222	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1223	}
		1224
		1225	ev_stop (EV_A_ (W)w);
		1226	}
		1227
		1228	void
		1229	ev_idle_start (EV_P_ struct ev_idle *w)
		1230	{
		1231	if (ev_is_active (w))
		1232	return;
		1233
		1234	ev_start (EV_A_ (W)w, ++idlecnt);
		1235	array_needsize (idles, idlemax, idlecnt, );
		1236	idles [idlecnt - 1] = w;
		1237	}
		1238
		1239	void
		1240	ev_idle_stop (EV_P_ struct ev_idle *w)
		1241	{
		1242	ev_clear_pending (EV_A_ (W)w);
		1243	if (ev_is_active (w))
		1244	return;
		1245
		1246	idles [((W)w)->active - 1] = idles [--idlecnt];
		1247	ev_stop (EV_A_ (W)w);
		1248	}
		1249
		1250	void
		1251	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1252	{
		1253	if (ev_is_active (w))
		1254	return;
		1255
		1256	ev_start (EV_A_ (W)w, ++preparecnt);
		1257	array_needsize (prepares, preparemax, preparecnt, );
		1258	prepares [preparecnt - 1] = w;
		1259	}
		1260
		1261	void
		1262	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1263	{
		1264	ev_clear_pending (EV_A_ (W)w);
		1265	if (ev_is_active (w))
		1266	return;
		1267
		1268	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1269	ev_stop (EV_A_ (W)w);
		1270	}
		1271
		1272	void
		1273	ev_check_start (EV_P_ struct ev_check *w)
		1274	{
		1275	if (ev_is_active (w))
		1276	return;
		1277
		1278	ev_start (EV_A_ (W)w, ++checkcnt);
		1279	array_needsize (checks, checkmax, checkcnt, );
		1280	checks [checkcnt - 1] = w;
		1281	}
		1282
		1283	void
		1284	ev_check_stop (EV_P_ struct ev_check *w)
		1285	{
		1286	ev_clear_pending (EV_A_ (W)w);
		1287	if (ev_is_active (w))
		1288	return;
		1289
		1290	checks [((W)w)->active - 1] = checks [--checkcnt];
		1291	ev_stop (EV_A_ (W)w);
		1292	}
		1293
		1294	#ifndef SA_RESTART
		1295	# define SA_RESTART 0
		1296	#endif
		1297
		1298	void
		1299	ev_signal_start (EV_P_ struct ev_signal *w)
		1300	{
		1301	#if EV_MULTIPLICITY
		1302	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1303	#endif
		1304	if (ev_is_active (w))
		1305	return;
		1306
		1307	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1308
		1309	ev_start (EV_A_ (W)w, 1);
434	array_needsize (signals, signalmax, w->signum, signals_init);	1310	array_needsize (signals, signalmax, w->signum, signals_init);
435	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1311	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
436	}
437		1312
		1313	if (!((WL)w)->next)
		1314	{
		1315	struct sigaction sa;
		1316	sa.sa_handler = sighandler;
		1317	sigfillset (&sa.sa_mask);
		1318	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1319	sigaction (w->signum, &sa, 0);
		1320	}
		1321	}
		1322
438	void	1323	void
439	evsignal_stop (struct ev_signal *w)	1324	ev_signal_stop (EV_P_ struct ev_signal *w)
440	{	1325	{
		1326	ev_clear_pending (EV_A_ (W)w);
441	if (!ev_is_active (w))	1327	if (!ev_is_active (w))
442	return;	1328	return;
443		1329
444	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1330	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
445	ev_stop ((struct ev_watcher *)w);	1331	ev_stop (EV_A_ (W)w);
		1332
		1333	if (!signals [w->signum - 1].head)
		1334	signal (w->signum, SIG_DFL);
		1335	}
		1336
		1337	void
		1338	ev_child_start (EV_P_ struct ev_child *w)
		1339	{
		1340	#if EV_MULTIPLICITY
		1341	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1342	#endif
		1343	if (ev_is_active (w))
		1344	return;
		1345
		1346	ev_start (EV_A_ (W)w, 1);
		1347	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1348	}
		1349
		1350	void
		1351	ev_child_stop (EV_P_ struct ev_child *w)
		1352	{
		1353	ev_clear_pending (EV_A_ (W)w);
		1354	if (ev_is_active (w))
		1355	return;
		1356
		1357	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1358	ev_stop (EV_A_ (W)w);
446	}	1359	}
447		1360
448	/*****************************************************************************/	1361	/*****************************************************************************/
449	#if 1
450		1362
451	static void	1363	struct ev_once
452	sin_cb (struct ev_io *w, int revents)
453	{	1364	{
454	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
455	}
456
457	static void
458	ocb (struct ev_timer *w, int revents)
459	{
460	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
461	}
462
463	int main (void)
464	{
465	struct ev_io sin;	1365	struct ev_io io;
466
467	ev_init (0);
468
469	evw_init (&sin, sin_cb, 55);
470	evio_set (&sin, 0, EV_READ);
471	evio_start (&sin);
472
473	struct ev_timer t1;	1366	struct ev_timer to;
474	evw_init (&t1, ocb, 1);	1367	void (*cb)(int revents, void *arg);
475	evtimer_set_rel (&t1, 1, 0);	1368	void *arg;
476	evtimer_start (&t1);	1369	};
477		1370
478	struct ev_timer t2;	1371	static void
479	evw_init (&t2, ocb, 2);	1372	once_cb (EV_P_ struct ev_once *once, int revents)
480	evtimer_set_abs (&t2, ev_time () + 2, 0);	1373	{
481	evtimer_start (&t2);	1374	void (*cb)(int revents, void *arg) = once->cb;
		1375	void *arg = once->arg;
482		1376
483	ev_loop (0);	1377	ev_io_stop (EV_A_ &once->io);
		1378	ev_timer_stop (EV_A_ &once->to);
		1379	free (once);
484		1380
485	return 0;	1381	cb (revents, arg);
486	}	1382	}
487		1383
488	#endif	1384	static void
		1385	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1386	{
		1387	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1388	}
489		1389
		1390	static void
		1391	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1392	{
		1393	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1394	}
490		1395
		1396	void
		1397	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1398	{
		1399	struct ev_once *once = malloc (sizeof (struct ev_once));
491		1400
		1401	if (!once)
		1402	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1403	else
		1404	{
		1405	once->cb = cb;
		1406	once->arg = arg;
492		1407
		1408	ev_watcher_init (&once->io, once_cb_io);
		1409	if (fd >= 0)
		1410	{
		1411	ev_io_set (&once->io, fd, events);
		1412	ev_io_start (EV_A_ &once->io);
		1413	}
		1414
		1415	ev_watcher_init (&once->to, once_cb_to);
		1416	if (timeout >= 0.)
		1417	{
		1418	ev_timer_set (&once->to, timeout, 0.);
		1419	ev_timer_start (EV_A_ &once->to);
		1420	}
		1421	}
		1422	}
		1423

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