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Comparing libev/ev.c (file contents):
Revision 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs.
Revision 1.63 by root, Sun Nov 4 22:03:17 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 ? cur << 1 : 16; \	225	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	226	do \
		227	{ \
		228	newcnt = array_roundsize (base, newcnt << 1); \
		229	} \
		230	while ((cnt) > newcnt); \
		231	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	232	base = realloc (base, sizeof (*base) * (newcnt)); \
74	init (base + cur, newcnt - cur); \	233	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	234	cur = newcnt; \
76	}	235	}
77		236
78	typedef struct	237	/*****************************************************************************/
79	{
80	struct ev_io *head;
81	unsigned char wev, rev; /* want, received event set */
82	} ANFD;
83
84	static ANFD *anfds;
85	static int anfdmax;
86
87	static int *fdchanges;
88	static int fdchangemax, fdchangecnt;
89		238
90	static void	239	static void
91	anfds_init (ANFD *base, int count)	240	anfds_init (ANFD *base, int count)
92	{	241	{
93	while (count--)	242	while (count--)
94	{	243	{
95	base->head = 0;	244	base->head = 0;
96	base->wev = base->rev = EV_NONE;	245	base->events = EV_NONE;
		246	base->reify = 0;
		247
97	++base;	248	++base;
98	}	249	}
99	}	250	}
100		251
101	typedef struct
102	{
103	struct ev_watcher *w;
104	int events;
105	} ANPENDING;
106
107	static ANPENDING *pendings;
108	static int pendingmax, pendingcnt;
109
110	static void	252	static void
111	event (struct ev_watcher *w, int events)	253	event (EV_P_ W w, int events)
112	{	254	{
		255	if (w->pending)
		256	{
		257	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		258	return;
		259	}
		260
113	w->pending = ++pendingcnt;	261	w->pending = ++pendingcnt [ABSPRI (w)];
114	array_needsize (pendings, pendingmax, pendingcnt, );	262	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
115	pendings [pendingcnt - 1].w = w;	263	pendings [ABSPRI (w)][w->pending - 1].w = w;
116	pendings [pendingcnt - 1].events = events;	264	pendings [ABSPRI (w)][w->pending - 1].events = events;
117	}	265	}
118		266
119	static void	267	static void
		268	queue_events (EV_P_ W *events, int eventcnt, int type)
		269	{
		270	int i;
		271
		272	for (i = 0; i < eventcnt; ++i)
		273	event (EV_A_ events [i], type);
		274	}
		275
		276	static void
120	fd_event (int fd, int events)	277	fd_event (EV_P_ int fd, int events)
121	{	278	{
122	ANFD *anfd = anfds + fd;	279	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	280	struct ev_io *w;
124		281
125	for (w = anfd->head; w; w = w->next)	282	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
126	{	283	{
127	int ev = w->events & events;	284	int ev = w->events & events;
128		285
129	if (ev)	286	if (ev)
130	event ((struct ev_watcher *)w, ev);	287	event (EV_A_ (W)w, ev);
		288	}
		289	}
		290
		291	/*****************************************************************************/
		292
		293	static void
		294	fd_reify (EV_P)
		295	{
		296	int i;
		297
		298	for (i = 0; i < fdchangecnt; ++i)
		299	{
		300	int fd = fdchanges [i];
		301	ANFD *anfd = anfds + fd;
		302	struct ev_io *w;
		303
		304	int events = 0;
		305
		306	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		307	events |= w->events;
		308
		309	anfd->reify = 0;
		310
		311	if (anfd->events != events)
		312	{
		313	method_modify (EV_A_ fd, anfd->events, events);
		314	anfd->events = events;
		315	}
		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;
131	}	370	}
132	}	371	}
133		372
134	static struct ev_timer **timers;	373	/* susually called after fork if method needs to re-arm all fds from scratch */
135	static int timermax, timercnt;
136
137	static void	374	static void
138	upheap (int k)	375	fd_rearm_all (EV_P)
139	{	376	{
140	struct ev_timer *w = timers [k];	377	int fd;
141		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
142	while (k && timers [k >> 1]->at > w->at)	395	while (k && heap [k >> 1]->at > w->at)
143	{	396	{
144	timers [k] = timers [k >> 1];	397	heap [k] = heap [k >> 1];
145	timers [k]->active = k + 1;	398	((W)heap [k])->active = k + 1;
146	k >>= 1;	399	k >>= 1;
147	}	400	}
148		401
149	timers [k] = w;	402	heap [k] = w;
150	timers [k]->active = k + 1;	403	((W)heap [k])->active = k + 1;
151		404
152	}	405	}
153		406
154	static void	407	static void
155	downheap (int k)	408	downheap (WT *heap, int N, int k)
156	{	409	{
157	struct ev_timer *w = timers [k];	410	WT w = heap [k];
158		411
159	while (k < (timercnt >> 1))	412	while (k < (N >> 1))
160	{	413	{
161	int j = k << 1;	414	int j = k << 1;
162		415
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	416	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
164	++j;	417	++j;
165		418
166	if (w->at <= timers [j]->at)	419	if (w->at <= heap [j]->at)
167	break;	420	break;
168		421
169	timers [k] = timers [j];	422	heap [k] = heap [j];
170	timers [k]->active = k + 1;	423	((W)heap [k])->active = k + 1;
171	k = j;	424	k = j;
172	}	425	}
173		426
174	timers [k] = w;	427	heap [k] = w;
175	timers [k]->active = k + 1;	428	((W)heap [k])->active = k + 1;
176	}	429	}
177		430
178	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;
179	static int signalmax, signalcnt;	440	static int signalmax;
180		441
		442	static int sigpipe [2];
		443	static sig_atomic_t volatile gotsig;
		444	static struct ev_io sigev;
		445
181	static void	446	static void
182	signals_init (struct ev_signal **base, int count)	447	signals_init (ANSIG *base, int count)
183	{	448	{
184	while (count--)	449	while (count--)
185	*base++ = 0;	450	{
186	}	451	base->head = 0;
		452	base->gotsig = 0;
187		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
188	#if HAVE_EPOLL	556	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	557	# include "ev_epoll.c"
190	#endif	558	#endif
		559	#if EV_USE_POLL
		560	# include "ev_poll.c"
		561	#endif
191	#if HAVE_SELECT	562	#if EV_USE_SELECT
192	# include "ev_select.c"	563	# include "ev_select.c"
193	#endif	564	#endif
194		565
195	int ev_init (int flags)	566	int
		567	ev_version_major (void)
196	{	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	{
197	#if HAVE_MONOTONIC	601	#if EV_USE_MONOTONIC
198	{	602	{
199	struct timespec ts;	603	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	604	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	605	have_monotonic = 1;
202	}	606	}
203	#endif	607	#endif
204		608
205	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;
206		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
207	#if HAVE_EPOLL	627	#if EV_USE_EPOLL
208	if (epoll_init (flags))	628	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
209	return ev_method;
210	#endif	629	#endif
		630	#if EV_USE_POLL
		631	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		632	#endif
211	#if HAVE_SELECT	633	#if EV_USE_SELECT
212	if (select_init (flags))	634	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
213	return ev_method;
214	#endif	635	#endif
215
216	ev_method = EVMETHOD_NONE;
217	return ev_method;
218	}
219
220	void ev_prefork (void)
221	{
222	}
223
224	void ev_postfork_parent (void)
225	{
226	}
227
228	void ev_postfork_child (void)
229	{
230	#if HAVE_EPOLL
231	epoll_postfork_child ();
232	#endif
233	}
234
235	static void
236	call_pending ()
237	{
238	int i;
239
240	for (i = 0; i < pendingcnt; ++i)
241	{	636	}
242	ANPENDING *p = pendings + i;	637	}
243		638
244	if (p->w)	639	void
		640	loop_destroy (EV_P)
		641	{
		642	#if EV_USE_WIN32
		643	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		644	#endif
		645	#if EV_USE_KQUEUE
		646	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		647	#endif
		648	#if EV_USE_EPOLL
		649	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		650	#endif
		651	#if EV_USE_POLL
		652	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		653	#endif
		654	#if EV_USE_SELECT
		655	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		656	#endif
		657
		658	method = 0;
		659	/*TODO*/
		660	}
		661
		662	void
		663	loop_fork (EV_P)
		664	{
		665	/*TODO*/
		666	#if EV_USE_EPOLL
		667	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		668	#endif
		669	#if EV_USE_KQUEUE
		670	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		671	#endif
		672	}
		673
		674	#if EV_MULTIPLICITY
		675	struct ev_loop *
		676	ev_loop_new (int methods)
		677	{
		678	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		679
		680	loop_init (EV_A_ methods);
		681
		682	if (ev_method (EV_A))
		683	return loop;
		684
		685	return 0;
		686	}
		687
		688	void
		689	ev_loop_destroy (EV_P)
		690	{
		691	loop_destroy (EV_A);
		692	free (loop);
		693	}
		694
		695	void
		696	ev_loop_fork (EV_P)
		697	{
		698	loop_fork (EV_A);
		699	}
		700
		701	#endif
		702
		703	#if EV_MULTIPLICITY
		704	struct ev_loop default_loop_struct;
		705	static struct ev_loop *default_loop;
		706
		707	struct ev_loop *
		708	#else
		709	static int default_loop;
		710
		711	int
		712	#endif
		713	ev_default_loop (int methods)
		714	{
		715	if (sigpipe [0] == sigpipe [1])
		716	if (pipe (sigpipe))
		717	return 0;
		718
		719	if (!default_loop)
		720	{
		721	#if EV_MULTIPLICITY
		722	struct ev_loop *loop = default_loop = &default_loop_struct;
		723	#else
		724	default_loop = 1;
		725	#endif
		726
		727	loop_init (EV_A_ methods);
		728
		729	if (ev_method (EV_A))
245	{	730	{
246	p->w->pending = 0;	731	ev_watcher_init (&sigev, sigcb);
247	p->w->cb (p->w, p->events);	732	ev_set_priority (&sigev, EV_MAXPRI);
		733	siginit (EV_A);
		734
		735	#ifndef WIN32
		736	ev_signal_init (&childev, childcb, SIGCHLD);
		737	ev_set_priority (&childev, EV_MAXPRI);
		738	ev_signal_start (EV_A_ &childev);
		739	ev_unref (EV_A); /* child watcher should not keep loop alive */
		740	#endif
248	}	741	}
		742	else
		743	default_loop = 0;
		744	}
		745
		746	return default_loop;
		747	}
		748
		749	void
		750	ev_default_destroy (void)
		751	{
		752	#if EV_MULTIPLICITY
		753	struct ev_loop *loop = default_loop;
		754	#endif
		755
		756	ev_ref (EV_A); /* child watcher */
		757	ev_signal_stop (EV_A_ &childev);
		758
		759	ev_ref (EV_A); /* signal watcher */
		760	ev_io_stop (EV_A_ &sigev);
		761
		762	close (sigpipe [0]); sigpipe [0] = 0;
		763	close (sigpipe [1]); sigpipe [1] = 0;
		764
		765	loop_destroy (EV_A);
		766	}
		767
		768	void
		769	ev_default_fork (void)
		770	{
		771	#if EV_MULTIPLICITY
		772	struct ev_loop *loop = default_loop;
		773	#endif
		774
		775	loop_fork (EV_A);
		776
		777	ev_io_stop (EV_A_ &sigev);
		778	close (sigpipe [0]);
		779	close (sigpipe [1]);
		780	pipe (sigpipe);
		781
		782	ev_ref (EV_A); /* signal watcher */
		783	siginit (EV_A);
		784	}
		785
		786	/*****************************************************************************/
		787
		788	static void
		789	call_pending (EV_P)
		790	{
		791	int pri;
		792
		793	for (pri = NUMPRI; pri--; )
		794	while (pendingcnt [pri])
		795	{
		796	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		797
		798	if (p->w)
		799	{
		800	p->w->pending = 0;
		801
		802	(*(void (**)(EV_P_ W, int))&p->w->cb) (EV_A_ p->w, p->events);
		803	}
249	}	804	}
250
251	pendingcnt = 0;
252	}	805	}
253		806
254	static void	807	static void
255	timer_reify (void)	808	timers_reify (EV_P)
256	{	809	{
257	while (timercnt && timers [0]->at <= ev_now)	810	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	811	{
259	struct ev_timer *w = timers [0];	812	struct ev_timer *w = timers [0];
260		813
		814	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		815
261	/* first reschedule timer */	816	/* first reschedule or stop timer */
262	if (w->repeat)	817	if (w->repeat)
263	{	818	{
264	if (w->is_abs)	819	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
265	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
266	else
267	w->at = ev_now + w->repeat;	820	((WT)w)->at = mn_now + w->repeat;
268		821	downheap ((WT *)timers, timercnt, 0);
269	downheap (0);
270	}	822	}
271	else	823	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	824	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		825
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	826	event (EV_A_ (W)w, EV_TIMEOUT);
		827	}
		828	}
		829
		830	static void
		831	periodics_reify (EV_P)
		832	{
		833	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
275	}	834	{
276	}	835	struct ev_periodic *w = periodics [0];
277		836
278	int ev_loop_done;	837	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
279		838
		839	/* first reschedule or stop timer */
		840	if (w->interval)
		841	{
		842	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		843	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		844	downheap ((WT *)periodics, periodiccnt, 0);
		845	}
		846	else
		847	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		848
		849	event (EV_A_ (W)w, EV_PERIODIC);
		850	}
		851	}
		852
		853	static void
		854	periodics_reschedule (EV_P)
		855	{
		856	int i;
		857
		858	/* adjust periodics after time jump */
		859	for (i = 0; i < periodiccnt; ++i)
		860	{
		861	struct ev_periodic *w = periodics [i];
		862
		863	if (w->interval)
		864	{
		865	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		866
		867	if (fabs (diff) >= 1e-4)
		868	{
		869	ev_periodic_stop (EV_A_ w);
		870	ev_periodic_start (EV_A_ w);
		871
		872	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		873	}
		874	}
		875	}
		876	}
		877
		878	inline int
		879	time_update_monotonic (EV_P)
		880	{
		881	mn_now = get_clock ();
		882
		883	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		884	{
		885	rt_now = rtmn_diff + mn_now;
		886	return 0;
		887	}
		888	else
		889	{
		890	now_floor = mn_now;
		891	rt_now = ev_time ();
		892	return 1;
		893	}
		894	}
		895
		896	static void
		897	time_update (EV_P)
		898	{
		899	int i;
		900
		901	#if EV_USE_MONOTONIC
		902	if (expect_true (have_monotonic))
		903	{
		904	if (time_update_monotonic (EV_A))
		905	{
		906	ev_tstamp odiff = rtmn_diff;
		907
		908	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		909	{
		910	rtmn_diff = rt_now - mn_now;
		911
		912	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		913	return; /* all is well */
		914
		915	rt_now = ev_time ();
		916	mn_now = get_clock ();
		917	now_floor = mn_now;
		918	}
		919
		920	periodics_reschedule (EV_A);
		921	/* no timer adjustment, as the monotonic clock doesn't jump */
		922	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		923	}
		924	}
		925	else
		926	#endif
		927	{
		928	rt_now = ev_time ();
		929
		930	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		931	{
		932	periodics_reschedule (EV_A);
		933
		934	/* adjust timers. this is easy, as the offset is the same for all */
		935	for (i = 0; i < timercnt; ++i)
		936	((WT)timers [i])->at += rt_now - mn_now;
		937	}
		938
		939	mn_now = rt_now;
		940	}
		941	}
		942
		943	void
		944	ev_ref (EV_P)
		945	{
		946	++activecnt;
		947	}
		948
		949	void
		950	ev_unref (EV_P)
		951	{
		952	--activecnt;
		953	}
		954
		955	static int loop_done;
		956
		957	void
280	int ev_loop (int flags)	958	ev_loop (EV_P_ int flags)
281	{	959	{
282	double block;	960	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	961	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
284		962
285	do	963	do
286	{	964	{
		965	/* queue check watchers (and execute them) */
		966	if (expect_false (preparecnt))
		967	{
		968	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		969	call_pending (EV_A);
		970	}
		971
287	/* update fd-related kernel structures */	972	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	973	fd_reify (EV_A);
289		974
290	/* calculate blocking time */	975	/* calculate blocking time */
		976
		977	/* we only need this for !monotonic clockor timers, but as we basically
		978	always have timers, we just calculate it always */
		979	#if EV_USE_MONOTONIC
		980	if (expect_true (have_monotonic))
		981	time_update_monotonic (EV_A);
		982	else
		983	#endif
		984	{
291	ev_now = ev_time ();	985	rt_now = ev_time ();
		986	mn_now = rt_now;
		987	}
292		988
293	if (flags & EVLOOP_NONBLOCK)	989	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	990	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	991	else
298	{	992	{
		993	block = MAX_BLOCKTIME;
		994
		995	if (timercnt)
		996	{
299	block = timers [0]->at - ev_now + method_fudge;	997	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
		998	if (block > to) block = to;
		999	}
		1000
		1001	if (periodiccnt)
		1002	{
		1003	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
		1004	if (block > to) block = to;
		1005	}
		1006
300	if (block < 0.) block = 0.;	1007	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1008	}
303		1009
304	method_poll (block);	1010	method_poll (EV_A_ block);
305		1011
		1012	/* update rt_now, do magic */
		1013	time_update (EV_A);
		1014
306	/* put pending timers into pendign queue and reschedule them */	1015	/* queue pending timers and reschedule them */
307	timer_reify ();	1016	timers_reify (EV_A); /* relative timers called last */
		1017	periodics_reify (EV_A); /* absolute timers called first */
308		1018
309	ev_now = ev_time ();	1019	/* queue idle watchers unless io or timers are pending */
		1020	if (!pendingcnt)
		1021	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1022
		1023	/* queue check watchers, to be executed first */
		1024	if (checkcnt)
		1025	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1026
310	call_pending ();	1027	call_pending (EV_A);
311	}	1028	}
312	while (!ev_loop_done);	1029	while (activecnt && !loop_done);
313	}
314		1030
315	static void	1031	if (loop_done != 2)
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1032	loop_done = 0;
		1033	}
		1034
		1035	void
		1036	ev_unloop (EV_P_ int how)
		1037	{
		1038	loop_done = how;
		1039	}
		1040
		1041	/*****************************************************************************/
		1042
		1043	inline void
		1044	wlist_add (WL *head, WL elem)
317	{	1045	{
318	elem->next = *head;	1046	elem->next = *head;
319	*head = elem;	1047	*head = elem;
320	}	1048	}
321		1049
322	static void	1050	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1051	wlist_del (WL *head, WL elem)
324	{	1052	{
325	while (*head)	1053	while (*head)
326	{	1054	{
327	if (*head == elem)	1055	if (*head == elem)
328	{	1056	{
…		…
332		1060
333	head = &(*head)->next;	1061	head = &(*head)->next;
334	}	1062	}
335	}	1063	}
336		1064
337	static void	1065	inline void
338	ev_start (struct ev_watcher *w, int active)	1066	ev_clear_pending (EV_P_ W w)
339	{	1067	{
		1068	if (w->pending)
		1069	{
		1070	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	1071	w->pending = 0;
		1072	}
		1073	}
		1074
		1075	inline void
		1076	ev_start (EV_P_ W w, int active)
		1077	{
		1078	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1079	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1080
341	w->active = active;	1081	w->active = active;
		1082	ev_ref (EV_A);
342	}	1083	}
343		1084
344	static void	1085	inline void
345	ev_stop (struct ev_watcher *w)	1086	ev_stop (EV_P_ W w)
346	{	1087	{
347	if (w->pending)	1088	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	1089	w->active = 0;
351	/* nop */
352	}	1090	}
353		1091
		1092	/*****************************************************************************/
		1093
354	void	1094	void
355	evio_start (struct ev_io *w)	1095	ev_io_start (EV_P_ struct ev_io *w)
356	{	1096	{
		1097	int fd = w->fd;
		1098
357	if (ev_is_active (w))	1099	if (ev_is_active (w))
358	return;	1100	return;
359		1101
360	int fd = w->fd;	1102	assert (("ev_io_start called with negative fd", fd >= 0));
361		1103
362	ev_start ((struct ev_watcher *)w, 1);	1104	ev_start (EV_A_ (W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1105	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1106	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		1107
366	++fdchangecnt;	1108	fd_change (EV_A_ fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	1109	}
370		1110
371	void	1111	void
372	evio_stop (struct ev_io *w)	1112	ev_io_stop (EV_P_ struct ev_io *w)
373	{	1113	{
		1114	ev_clear_pending (EV_A_ (W)w);
374	if (!ev_is_active (w))	1115	if (!ev_is_active (w))
375	return;	1116	return;
376		1117
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1118	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	1119	ev_stop (EV_A_ (W)w);
379		1120
380	++fdchangecnt;	1121	fd_change (EV_A_ w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	1122	}
384		1123
385	void	1124	void
386	evtimer_start (struct ev_timer *w)	1125	ev_timer_start (EV_P_ struct ev_timer *w)
387	{	1126	{
388	if (ev_is_active (w))	1127	if (ev_is_active (w))
389	return;	1128	return;
390		1129
391	if (w->is_abs)	1130	((WT)w)->at += mn_now;
392	{
393	/* this formula differs from the one in timer_reify becuse we do not round up */
394	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
396	}
397	else
398	w->at += ev_now;
399		1131
400	ev_start ((struct ev_watcher *)w, ++timercnt);	1132	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1133
		1134	ev_start (EV_A_ (W)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );	1135	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;	1136	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);	1137	upheap ((WT *)timers, timercnt - 1);
404	}
405		1138
		1139	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1140	}
		1141
406	void	1142	void
407	evtimer_stop (struct ev_timer *w)	1143	ev_timer_stop (EV_P_ struct ev_timer *w)
408	{	1144	{
		1145	ev_clear_pending (EV_A_ (W)w);
409	if (!ev_is_active (w))	1146	if (!ev_is_active (w))
410	return;	1147	return;
411		1148
		1149	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1150
412	if (w->active < timercnt--)	1151	if (((W)w)->active < timercnt--)
413	{	1152	{
414	timers [w->active - 1] = timers [timercnt];	1153	timers [((W)w)->active - 1] = timers [timercnt];
415	downheap (w->active - 1);	1154	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
416	}	1155	}
417		1156
418	ev_stop ((struct ev_watcher *)w);	1157	((WT)w)->at = w->repeat;
419	}
420		1158
		1159	ev_stop (EV_A_ (W)w);
		1160	}
		1161
421	void	1162	void
422	evsignal_start (struct ev_signal *w)	1163	ev_timer_again (EV_P_ struct ev_timer *w)
423	{	1164	{
424	if (ev_is_active (w))	1165	if (ev_is_active (w))
425	return;	1166	{
		1167	if (w->repeat)
		1168	{
		1169	((WT)w)->at = mn_now + w->repeat;
		1170	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1171	}
		1172	else
		1173	ev_timer_stop (EV_A_ w);
		1174	}
		1175	else if (w->repeat)
		1176	ev_timer_start (EV_A_ w);
		1177	}
426		1178
427	ev_start ((struct ev_watcher *)w, 1);	1179	void
		1180	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1181	{
		1182	if (ev_is_active (w))
		1183	return;
		1184
		1185	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1186
		1187	/* this formula differs from the one in periodic_reify because we do not always round up */
		1188	if (w->interval)
		1189	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1190
		1191	ev_start (EV_A_ (W)w, ++periodiccnt);
		1192	array_needsize (periodics, periodicmax, periodiccnt, );
		1193	periodics [periodiccnt - 1] = w;
		1194	upheap ((WT *)periodics, periodiccnt - 1);
		1195
		1196	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1197	}
		1198
		1199	void
		1200	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1201	{
		1202	ev_clear_pending (EV_A_ (W)w);
		1203	if (!ev_is_active (w))
		1204	return;
		1205
		1206	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1207
		1208	if (((W)w)->active < periodiccnt--)
		1209	{
		1210	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1211	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1212	}
		1213
		1214	ev_stop (EV_A_ (W)w);
		1215	}
		1216
		1217	void
		1218	ev_idle_start (EV_P_ struct ev_idle *w)
		1219	{
		1220	if (ev_is_active (w))
		1221	return;
		1222
		1223	ev_start (EV_A_ (W)w, ++idlecnt);
		1224	array_needsize (idles, idlemax, idlecnt, );
		1225	idles [idlecnt - 1] = w;
		1226	}
		1227
		1228	void
		1229	ev_idle_stop (EV_P_ struct ev_idle *w)
		1230	{
		1231	ev_clear_pending (EV_A_ (W)w);
		1232	if (ev_is_active (w))
		1233	return;
		1234
		1235	idles [((W)w)->active - 1] = idles [--idlecnt];
		1236	ev_stop (EV_A_ (W)w);
		1237	}
		1238
		1239	void
		1240	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1241	{
		1242	if (ev_is_active (w))
		1243	return;
		1244
		1245	ev_start (EV_A_ (W)w, ++preparecnt);
		1246	array_needsize (prepares, preparemax, preparecnt, );
		1247	prepares [preparecnt - 1] = w;
		1248	}
		1249
		1250	void
		1251	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1252	{
		1253	ev_clear_pending (EV_A_ (W)w);
		1254	if (ev_is_active (w))
		1255	return;
		1256
		1257	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1258	ev_stop (EV_A_ (W)w);
		1259	}
		1260
		1261	void
		1262	ev_check_start (EV_P_ struct ev_check *w)
		1263	{
		1264	if (ev_is_active (w))
		1265	return;
		1266
		1267	ev_start (EV_A_ (W)w, ++checkcnt);
		1268	array_needsize (checks, checkmax, checkcnt, );
		1269	checks [checkcnt - 1] = w;
		1270	}
		1271
		1272	void
		1273	ev_check_stop (EV_P_ struct ev_check *w)
		1274	{
		1275	ev_clear_pending (EV_A_ (W)w);
		1276	if (ev_is_active (w))
		1277	return;
		1278
		1279	checks [((W)w)->active - 1] = checks [--checkcnt];
		1280	ev_stop (EV_A_ (W)w);
		1281	}
		1282
		1283	#ifndef SA_RESTART
		1284	# define SA_RESTART 0
		1285	#endif
		1286
		1287	void
		1288	ev_signal_start (EV_P_ struct ev_signal *w)
		1289	{
		1290	#if EV_MULTIPLICITY
		1291	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1292	#endif
		1293	if (ev_is_active (w))
		1294	return;
		1295
		1296	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1297
		1298	ev_start (EV_A_ (W)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);	1299	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1300	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
430	}
431		1301
		1302	if (!((WL)w)->next)
		1303	{
		1304	struct sigaction sa;
		1305	sa.sa_handler = sighandler;
		1306	sigfillset (&sa.sa_mask);
		1307	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1308	sigaction (w->signum, &sa, 0);
		1309	}
		1310	}
		1311
432	void	1312	void
433	evsignal_stop (struct ev_signal *w)	1313	ev_signal_stop (EV_P_ struct ev_signal *w)
434	{	1314	{
		1315	ev_clear_pending (EV_A_ (W)w);
435	if (!ev_is_active (w))	1316	if (!ev_is_active (w))
436	return;	1317	return;
437		1318
438	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1319	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
439	ev_stop ((struct ev_watcher *)w);	1320	ev_stop (EV_A_ (W)w);
		1321
		1322	if (!signals [w->signum - 1].head)
		1323	signal (w->signum, SIG_DFL);
		1324	}
		1325
		1326	void
		1327	ev_child_start (EV_P_ struct ev_child *w)
		1328	{
		1329	#if EV_MULTIPLICITY
		1330	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1331	#endif
		1332	if (ev_is_active (w))
		1333	return;
		1334
		1335	ev_start (EV_A_ (W)w, 1);
		1336	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1337	}
		1338
		1339	void
		1340	ev_child_stop (EV_P_ struct ev_child *w)
		1341	{
		1342	ev_clear_pending (EV_A_ (W)w);
		1343	if (ev_is_active (w))
		1344	return;
		1345
		1346	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1347	ev_stop (EV_A_ (W)w);
440	}	1348	}
441		1349
442	/*****************************************************************************/	1350	/*****************************************************************************/
443	#if 1
444		1351
445	static void	1352	struct ev_once
446	sin_cb (struct ev_io *w, int revents)
447	{	1353	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}
450
451	static void
452	ocb (struct ev_timer *w, int revents)
453	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
455	}
456
457	int main (void)
458	{
459	struct ev_io sin;	1354	struct ev_io io;
460
461	ev_init (0);
462
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);
465	evio_start (&sin);
466
467	struct ev_timer t[1000];	1355	struct ev_timer to;
		1356	void (*cb)(int revents, void *arg);
		1357	void *arg;
		1358	};
468		1359
469	int i;	1360	static void
470	for (i = 0; i < 1000; ++i)	1361	once_cb (EV_P_ struct ev_once *once, int revents)
471	{	1362	{
472	struct ev_timer *w = t + i;	1363	void (*cb)(int revents, void *arg) = once->cb;
473	evw_init (w, ocb, i);	1364	void *arg = once->arg;
474	evtimer_set_rel (w, drand48 (), 0);	1365
475	evtimer_start (w);	1366	ev_io_stop (EV_A_ &once->io);
476	if (drand48 () < 0.5)	1367	ev_timer_stop (EV_A_ &once->to);
477	evtimer_stop (w);	1368	free (once);
		1369
		1370	cb (revents, arg);
		1371	}
		1372
		1373	static void
		1374	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1375	{
		1376	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1377	}
		1378
		1379	static void
		1380	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1381	{
		1382	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1383	}
		1384
		1385	void
		1386	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1387	{
		1388	struct ev_once *once = malloc (sizeof (struct ev_once));
		1389
		1390	if (!once)
		1391	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1392	else
478	}	1393	{
		1394	once->cb = cb;
		1395	once->arg = arg;
479		1396
480	ev_loop (0);	1397	ev_watcher_init (&once->io, once_cb_io);
		1398	if (fd >= 0)
		1399	{
		1400	ev_io_set (&once->io, fd, events);
		1401	ev_io_start (EV_A_ &once->io);
		1402	}
481		1403
482	return 0;	1404	ev_watcher_init (&once->to, once_cb_to);
		1405	if (timeout >= 0.)
		1406	{
		1407	ev_timer_set (&once->to, timeout, 0.);
		1408	ev_timer_start (EV_A_ &once->to);
		1409	}
		1410	}
483	}	1411	}
484		1412
485	#endif
486
487
488
489

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