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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 1.52 by root, Sat Nov 3 22:10:39 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	#endif
		34
1	#include <math.h>	35	#include <math.h>
2	#include <stdlib.h>	36	#include <stdlib.h>
		37	#include <unistd.h>
		38	#include <fcntl.h>
		39	#include <signal.h>
		40	#include <stddef.h>
3		41
4	#include <stdio.h>	42	#include <stdio.h>
5		43
		44	#include <assert.h>
6	#include <errno.h>	45	#include <errno.h>
		46	#include <sys/types.h>
		47	#ifndef WIN32
		48	# include <sys/wait.h>
		49	#endif
7	#include <sys/time.h>	50	#include <sys/time.h>
8	#include <time.h>	51	#include <time.h>
9		52
		53	/**/
		54
		55	#ifndef EV_USE_MONOTONIC
		56	# define EV_USE_MONOTONIC 1
		57	#endif
		58
		59	#ifndef EV_USE_SELECT
		60	# define EV_USE_SELECT 1
		61	#endif
		62
		63	#ifndef EV_USEV_POLL
		64	# define EV_USEV_POLL 0 /* poll is usually slower than select, and not as well tested */
		65	#endif
		66
		67	#ifndef EV_USE_EPOLL
		68	# define EV_USE_EPOLL 0
		69	#endif
		70
		71	#ifndef EV_USE_KQUEUE
		72	# define EV_USE_KQUEUE 0
		73	#endif
		74
		75	#ifndef EV_USE_REALTIME
		76	# define EV_USE_REALTIME 1
		77	#endif
		78
		79	/**/
		80
10	#ifdef CLOCK_MONOTONIC	81	#ifndef CLOCK_MONOTONIC
		82	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	83	# define EV_USE_MONOTONIC 0
12	#endif	84	#endif
13		85
14	#define HAVE_EPOLL 1	86	#ifndef CLOCK_REALTIME
		87	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	88	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	89	#endif
17		90
18	#define MAX_BLOCKTIME 60.	91	/**/
		92
		93	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		94	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		95	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		96	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
19		97
20	#include "ev.h"	98	#include "ev.h"
21		99
		100	#if __GNUC__ >= 3
		101	# define expect(expr,value) __builtin_expect ((expr),(value))
		102	# define inline inline
		103	#else
		104	# define expect(expr,value) (expr)
		105	# define inline static
		106	#endif
		107
		108	#define expect_false(expr) expect ((expr) != 0, 0)
		109	#define expect_true(expr) expect ((expr) != 0, 1)
		110
		111	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		112	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		113
22	struct ev_watcher {	114	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	115	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	116	typedef struct ev_watcher_time *WT;
28	};
29		117
30	ev_tstamp ev_now;	118	static ev_tstamp now_floor, mn_now, diff; /* monotonic clock */
31	int ev_method;	119	static ev_tstamp rt_now;
		120	static int method;
32		121
33	static int have_monotonic; /* runtime */	122	static int have_monotonic; /* runtime */
34		123
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	124	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
36	static void (*method_reify)(void);	125	static void (*method_modify)(EV_P_ int fd, int oev, int nev);
37	static void (*method_poll)(ev_tstamp timeout);	126	static void (*method_poll)(EV_P_ ev_tstamp timeout);
38		127
39	ev_tstamp	128	static int activecnt; /* number of active events */
		129
		130	#if EV_USE_SELECT
		131	static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
		132	static int vec_max;
		133	#endif
		134
		135	#if EV_USEV_POLL
		136	static struct pollfd *polls;
		137	static int pollmax, pollcnt;
		138	static int *pollidxs; /* maps fds into structure indices */
		139	static int pollidxmax;
		140	#endif
		141
		142	#if EV_USE_EPOLL
		143	static int epoll_fd = -1;
		144
		145	static struct epoll_event *events;
		146	static int eventmax;
		147	#endif
		148
		149	#if EV_USE_KQUEUE
		150	static int kqueue_fd;
		151	static struct kevent *kqueue_changes;
		152	static int kqueue_changemax, kqueue_changecnt;
		153	static struct kevent *kqueue_events;
		154	static int kqueue_eventmax;
		155	#endif
		156
		157	/*****************************************************************************/
		158
		159	inline ev_tstamp
40	ev_time (void)	160	ev_time (void)
41	{	161	{
42	#if HAVE_REALTIME	162	#if EV_USE_REALTIME
43	struct timespec ts;	163	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	164	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	165	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	166	#else
47	struct timeval tv;	167	struct timeval tv;
48	gettimeofday (&tv, 0);	168	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	169	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	170	#endif
51	}	171	}
52		172
53	static ev_tstamp	173	inline ev_tstamp
54	get_clock (void)	174	get_clock (void)
55	{	175	{
56	#if HAVE_MONOTONIC	176	#if EV_USE_MONOTONIC
57	if (have_monotonic)	177	if (expect_true (have_monotonic))
58	{	178	{
59	struct timespec ts;	179	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	180	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	181	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	182	}
63	#endif	183	#endif
64		184
65	return ev_time ();	185	return ev_time ();
66	}	186	}
67		187
		188	ev_tstamp
		189	ev_now (EV_P)
		190	{
		191	return rt_now;
		192	}
		193
		194	#define array_roundsize(base,n) ((n) | 4 & ~3)
		195
68	#define array_needsize(base,cur,cnt,init) \	196	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	197	if (expect_false ((cnt) > cur)) \
70	{ \	198	{ \
71	int newcnt = cur ? cur << 1 : 16; \	199	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	200	do \
		201	{ \
		202	newcnt = array_roundsize (base, newcnt << 1); \
		203	} \
		204	while ((cnt) > newcnt); \
		205	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	206	base = realloc (base, sizeof (*base) * (newcnt)); \
74	init (base + cur, newcnt - cur); \	207	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	208	cur = newcnt; \
76	}	209	}
77		210
		211	/*****************************************************************************/
		212
78	typedef struct	213	typedef struct
79	{	214	{
80	struct ev_io *head;	215	struct ev_watcher_list *head;
81	unsigned char wev, rev; /* want, received event set */	216	unsigned char events;
		217	unsigned char reify;
82	} ANFD;	218	} ANFD;
83		219
84	static ANFD *anfds;	220	static ANFD *anfds;
85	static int anfdmax;	221	static int anfdmax;
86		222
		223	static void
		224	anfds_init (ANFD *base, int count)
		225	{
		226	while (count--)
		227	{
		228	base->head = 0;
		229	base->events = EV_NONE;
		230	base->reify = 0;
		231
		232	++base;
		233	}
		234	}
		235
		236	typedef struct
		237	{
		238	W w;
		239	int events;
		240	} ANPENDING;
		241
		242	static ANPENDING *pendings [NUMPRI];
		243	static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
		244
		245	static void
		246	event (EV_P_ W w, int events)
		247	{
		248	if (w->pending)
		249	{
		250	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		251	return;
		252	}
		253
		254	w->pending = ++pendingcnt [ABSPRI (w)];
		255	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
		256	pendings [ABSPRI (w)][w->pending - 1].w = w;
		257	pendings [ABSPRI (w)][w->pending - 1].events = events;
		258	}
		259
		260	static void
		261	queue_events (EV_P_ W *events, int eventcnt, int type)
		262	{
		263	int i;
		264
		265	for (i = 0; i < eventcnt; ++i)
		266	event (EV_A_ events [i], type);
		267	}
		268
		269	static void
		270	fd_event (EV_P_ int fd, int events)
		271	{
		272	ANFD *anfd = anfds + fd;
		273	struct ev_io *w;
		274
		275	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		276	{
		277	int ev = w->events & events;
		278
		279	if (ev)
		280	event (EV_A_ (W)w, ev);
		281	}
		282	}
		283
		284	/*****************************************************************************/
		285
87	static int *fdchanges;	286	static int *fdchanges;
88	static int fdchangemax, fdchangecnt;	287	static int fdchangemax, fdchangecnt;
89		288
90	static void	289	static void
91	anfds_init (ANFD *base, int count)	290	fd_reify (EV_P)
92	{	291	{
93	while (count--)	292	int i;
94	{	293
95	base->head = 0;	294	for (i = 0; i < fdchangecnt; ++i)
96	base->wev = base->rev = EV_NONE;
97	++base;
98	}	295	{
99	}	296	int fd = fdchanges [i];
100
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
111	event (struct ev_watcher *w, int events)
112	{
113	w->pending = ++pendingcnt;
114	array_needsize (pendings, pendingmax, pendingcnt, );
115	pendings [pendingcnt - 1].w = w;
116	pendings [pendingcnt - 1].events = events;
117	}
118
119	static void
120	fd_event (int fd, int events)
121	{
122	ANFD *anfd = anfds + fd;	297	ANFD *anfd = anfds + fd;
		298	struct ev_io *w;
		299
		300	int events = 0;
		301
		302	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		303	events |= w->events;
		304
		305	anfd->reify = 0;
		306
		307	if (anfd->events != events)
		308	{
		309	method_modify (EV_A_ fd, anfd->events, events);
		310	anfd->events = events;
		311	}
		312	}
		313
		314	fdchangecnt = 0;
		315	}
		316
		317	static void
		318	fd_change (EV_P_ int fd)
		319	{
		320	if (anfds [fd].reify || fdchangecnt < 0)
		321	return;
		322
		323	anfds [fd].reify = 1;
		324
		325	++fdchangecnt;
		326	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		327	fdchanges [fdchangecnt - 1] = fd;
		328	}
		329
		330	static void
		331	fd_kill (EV_P_ int fd)
		332	{
123	struct ev_io *w;	333	struct ev_io *w;
124		334
125	for (w = anfd->head; w; w = w->next)	335	while ((w = (struct ev_io *)anfds [fd].head))
		336	{
		337	ev_io_stop (EV_A_ w);
		338	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		339	}
		340	}
		341
		342	/* called on EBADF to verify fds */
		343	static void
		344	fd_ebadf (EV_P)
		345	{
		346	int fd;
		347
		348	for (fd = 0; fd < anfdmax; ++fd)
		349	if (anfds [fd].events)
		350	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		351	fd_kill (EV_A_ fd);
		352	}
		353
		354	/* called on ENOMEM in select/poll to kill some fds and retry */
		355	static void
		356	fd_enomem (EV_P)
		357	{
		358	int fd = anfdmax;
		359
		360	while (fd--)
		361	if (anfds [fd].events)
126	{	362	{
127	int ev = w->events & events;	363	close (fd);
128		364	fd_kill (EV_A_ fd);
129	if (ev)	365	return;
130	event ((struct ev_watcher *)w, ev);
131	}	366	}
132	}	367	}
		368
		369	/*****************************************************************************/
133		370
134	static struct ev_timer **timers;	371	static struct ev_timer **timers;
135	static int timermax, timercnt;	372	static int timermax, timercnt;
136		373
		374	static struct ev_periodic **periodics;
		375	static int periodicmax, periodiccnt;
		376
137	static void	377	static void
138	upheap (int k)	378	upheap (WT *timers, int k)
139	{	379	{
140	struct ev_timer *w = timers [k];	380	WT w = timers [k];
141		381
142	while (k && timers [k >> 1]->at > w->at)	382	while (k && timers [k >> 1]->at > w->at)
143	{	383	{
144	timers [k] = timers [k >> 1];	384	timers [k] = timers [k >> 1];
145	timers [k]->active = k + 1;	385	timers [k]->active = k + 1;
…		…
150	timers [k]->active = k + 1;	390	timers [k]->active = k + 1;
151		391
152	}	392	}
153		393
154	static void	394	static void
155	downheap (int k)	395	downheap (WT *timers, int N, int k)
156	{	396	{
157	struct ev_timer *w = timers [k];	397	WT w = timers [k];
158		398
159	while (k < (timercnt >> 1))	399	while (k < (N >> 1))
160	{	400	{
161	int j = k << 1;	401	int j = k << 1;
162		402
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	403	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
164	++j;	404	++j;
165		405
166	if (w->at <= timers [j]->at)	406	if (w->at <= timers [j]->at)
167	break;	407	break;
168		408
…		…
173		413
174	timers [k] = w;	414	timers [k] = w;
175	timers [k]->active = k + 1;	415	timers [k]->active = k + 1;
176	}	416	}
177		417
178	static struct ev_signal **signals;	418	/*****************************************************************************/
		419
		420	typedef struct
		421	{
		422	struct ev_watcher_list *head;
		423	sig_atomic_t volatile gotsig;
		424	} ANSIG;
		425
		426	static ANSIG *signals;
179	static int signalmax, signalcnt;	427	static int signalmax;
180		428
		429	static int sigpipe [2];
		430	static sig_atomic_t volatile gotsig;
		431	static struct ev_io sigev;
		432
181	static void	433	static void
182	signals_init (struct ev_signal **base, int count)	434	signals_init (ANSIG *base, int count)
183	{	435	{
184	while (count--)	436	while (count--)
185	*base++ = 0;	437	{
186	}	438	base->head = 0;
		439	base->gotsig = 0;
187		440
		441	++base;
		442	}
		443	}
		444
		445	static void
		446	sighandler (int signum)
		447	{
		448	signals [signum - 1].gotsig = 1;
		449
		450	if (!gotsig)
		451	{
		452	int old_errno = errno;
		453	gotsig = 1;
		454	write (sigpipe [1], &signum, 1);
		455	errno = old_errno;
		456	}
		457	}
		458
		459	static void
		460	sigcb (EV_P_ struct ev_io *iow, int revents)
		461	{
		462	struct ev_watcher_list *w;
		463	int signum;
		464
		465	read (sigpipe [0], &revents, 1);
		466	gotsig = 0;
		467
		468	for (signum = signalmax; signum--; )
		469	if (signals [signum].gotsig)
		470	{
		471	signals [signum].gotsig = 0;
		472
		473	for (w = signals [signum].head; w; w = w->next)
		474	event (EV_A_ (W)w, EV_SIGNAL);
		475	}
		476	}
		477
		478	static void
		479	siginit (EV_P)
		480	{
		481	#ifndef WIN32
		482	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		483	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		484
		485	/* rather than sort out wether we really need nb, set it */
		486	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		487	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		488	#endif
		489
		490	ev_io_set (&sigev, sigpipe [0], EV_READ);
		491	ev_io_start (&sigev);
		492	ev_unref (EV_A); /* child watcher should not keep loop alive */
		493	}
		494
		495	/*****************************************************************************/
		496
		497	static struct ev_idle **idles;
		498	static int idlemax, idlecnt;
		499
		500	static struct ev_prepare **prepares;
		501	static int preparemax, preparecnt;
		502
		503	static struct ev_check **checks;
		504	static int checkmax, checkcnt;
		505
		506	/*****************************************************************************/
		507
		508	static struct ev_child *childs [PID_HASHSIZE];
		509	static struct ev_signal childev;
		510
		511	#ifndef WIN32
		512
		513	#ifndef WCONTINUED
		514	# define WCONTINUED 0
		515	#endif
		516
		517	static void
		518	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		519	{
		520	struct ev_child *w;
		521
		522	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		523	if (w->pid == pid || !w->pid)
		524	{
		525	w->priority = sw->priority; /* need to do it *now* */
		526	w->rpid = pid;
		527	w->rstatus = status;
		528	event (EV_A_ (W)w, EV_CHILD);
		529	}
		530	}
		531
		532	static void
		533	childcb (EV_P_ struct ev_signal *sw, int revents)
		534	{
		535	int pid, status;
		536
		537	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		538	{
		539	/* make sure we are called again until all childs have been reaped */
		540	event (EV_A_ (W)sw, EV_SIGNAL);
		541
		542	child_reap (EV_A_ sw, pid, pid, status);
		543	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		544	}
		545	}
		546
		547	#endif
		548
		549	/*****************************************************************************/
		550
		551	#if EV_USE_KQUEUE
		552	# include "ev_kqueue.c"
		553	#endif
188	#if HAVE_EPOLL	554	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	555	# include "ev_epoll.c"
190	#endif	556	#endif
		557	#if EV_USEV_POLL
		558	# include "ev_poll.c"
		559	#endif
191	#if HAVE_SELECT	560	#if EV_USE_SELECT
192	# include "ev_select.c"	561	# include "ev_select.c"
193	#endif	562	#endif
194		563
195	int ev_init (int flags)	564	int
		565	ev_version_major (void)
196	{	566	{
		567	return EV_VERSION_MAJOR;
		568	}
		569
		570	int
		571	ev_version_minor (void)
		572	{
		573	return EV_VERSION_MINOR;
		574	}
		575
		576	/* return true if we are running with elevated privileges and should ignore env variables */
		577	static int
		578	enable_secure (void)
		579	{
		580	#ifdef WIN32
		581	return 0;
		582	#else
		583	return getuid () != geteuid ()
		584	|| getgid () != getegid ();
		585	#endif
		586	}
		587
		588	int
		589	ev_method (EV_P)
		590	{
		591	return method;
		592	}
		593
		594	int
		595	ev_init (EV_P_ int methods)
		596	{
		597	if (!method)
		598	{
197	#if HAVE_MONOTONIC	599	#if EV_USE_MONOTONIC
198	{	600	{
199	struct timespec ts;	601	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	602	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	603	have_monotonic = 1;
202	}	604	}
203	#endif	605	#endif
204		606
205	ev_now = ev_time ();	607	rt_now = ev_time ();
		608	mn_now = get_clock ();
		609	now_floor = mn_now;
		610	diff = rt_now - mn_now;
206		611
		612	if (pipe (sigpipe))
		613	return 0;
		614
		615	if (methods == EVMETHOD_AUTO)
		616	if (!enable_secure () && getenv ("LIBmethodS"))
		617	methods = atoi (getenv ("LIBmethodS"));
		618	else
		619	methods = EVMETHOD_ANY;
		620
		621	method = 0;
		622	#if EV_USE_KQUEUE
		623	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		624	#endif
207	#if HAVE_EPOLL	625	#if EV_USE_EPOLL
208	if (epoll_init (flags))	626	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
209	return ev_method;
210	#endif	627	#endif
		628	#if EV_USEV_POLL
		629	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		630	#endif
211	#if HAVE_SELECT	631	#if EV_USE_SELECT
212	if (select_init (flags))	632	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
213	return ev_method;
214	#endif	633	#endif
215		634
216	ev_method = EVMETHOD_NONE;	635	if (method)
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	{
242	ANPENDING *p = pendings + i;
243
244	if (p->w)
245	{	636	{
246	p->w->pending = 0;	637	ev_watcher_init (&sigev, sigcb);
247	p->w->cb (p->w, p->events);	638	ev_set_priority (&sigev, EV_MAXPRI);
		639	siginit (EV_A);
		640
		641	#ifndef WIN32
		642	ev_signal_init (&childev, childcb, SIGCHLD);
		643	ev_set_priority (&childev, EV_MAXPRI);
		644	ev_signal_start (EV_A_ &childev);
		645	ev_unref (EV_A); /* child watcher should not keep loop alive */
		646	#endif
248	}	647	}
249	}	648	}
250		649
251	pendingcnt = 0;	650	return method;
252	}	651	}
253		652
		653	/*****************************************************************************/
		654
		655	void
		656	ev_fork_prepare (void)
		657	{
		658	/* nop */
		659	}
		660
		661	void
		662	ev_fork_parent (void)
		663	{
		664	/* nop */
		665	}
		666
		667	void
		668	ev_fork_child (void)
		669	{
		670	#if EV_USE_EPOLL
		671	if (method == EVMETHOD_EPOLL)
		672	epoll_postfork_child ();
		673	#endif
		674
		675	ev_io_stop (&sigev);
		676	close (sigpipe [0]);
		677	close (sigpipe [1]);
		678	pipe (sigpipe);
		679	siginit ();
		680	}
		681
		682	/*****************************************************************************/
		683
254	static void	684	static void
		685	call_pending (EV_P)
		686	{
		687	int pri;
		688
		689	for (pri = NUMPRI; pri--; )
		690	while (pendingcnt [pri])
		691	{
		692	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		693
		694	if (p->w)
		695	{
		696	p->w->pending = 0;
		697	p->w->cb (EV_A_ p->w, p->events);
		698	}
		699	}
		700	}
		701
		702	static void
255	timer_reify (void)	703	timers_reify (EV_P)
256	{	704	{
257	while (timercnt && timers [0]->at <= ev_now)	705	while (timercnt && timers [0]->at <= mn_now)
258	{	706	{
259	struct ev_timer *w = timers [0];	707	struct ev_timer *w = timers [0];
260		708
261	/* first reschedule timer */	709	/* first reschedule or stop timer */
262	if (w->repeat)	710	if (w->repeat)
263	{	711	{
264	if (w->is_abs)	712	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;	713	w->at = mn_now + w->repeat;
268		714	downheap ((WT *)timers, timercnt, 0);
269	downheap (0);
270	}	715	}
271	else	716	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	717	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		718
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	719	event ((W)w, EV_TIMEOUT);
		720	}
		721	}
		722
		723	static void
		724	periodics_reify (EV_P)
		725	{
		726	while (periodiccnt && periodics [0]->at <= rt_now)
275	}	727	{
276	}	728	struct ev_periodic *w = periodics [0];
277		729
278	int ev_loop_done;	730	/* first reschedule or stop timer */
		731	if (w->interval)
		732	{
		733	w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
		734	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
		735	downheap ((WT *)periodics, periodiccnt, 0);
		736	}
		737	else
		738	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
279		739
		740	event (EV_A_ (W)w, EV_PERIODIC);
		741	}
		742	}
		743
		744	static void
		745	periodics_reschedule (EV_P_ ev_tstamp diff)
		746	{
		747	int i;
		748
		749	/* adjust periodics after time jump */
		750	for (i = 0; i < periodiccnt; ++i)
		751	{
		752	struct ev_periodic *w = periodics [i];
		753
		754	if (w->interval)
		755	{
		756	ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
		757
		758	if (fabs (diff) >= 1e-4)
		759	{
		760	ev_periodic_stop (EV_A_ w);
		761	ev_periodic_start (EV_A_ w);
		762
		763	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		764	}
		765	}
		766	}
		767	}
		768
		769	inline int
		770	time_update_monotonic (EV_P)
		771	{
		772	mn_now = get_clock ();
		773
		774	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		775	{
		776	rt_now = mn_now + diff;
		777	return 0;
		778	}
		779	else
		780	{
		781	now_floor = mn_now;
		782	rt_now = ev_time ();
		783	return 1;
		784	}
		785	}
		786
		787	static void
		788	time_update (EV_P)
		789	{
		790	int i;
		791
		792	#if EV_USE_MONOTONIC
		793	if (expect_true (have_monotonic))
		794	{
		795	if (time_update_monotonic (EV_A))
		796	{
		797	ev_tstamp odiff = diff;
		798
		799	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		800	{
		801	diff = rt_now - mn_now;
		802
		803	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		804	return; /* all is well */
		805
		806	rt_now = ev_time ();
		807	mn_now = get_clock ();
		808	now_floor = mn_now;
		809	}
		810
		811	periodics_reschedule (EV_A_ diff - odiff);
		812	/* no timer adjustment, as the monotonic clock doesn't jump */
		813	}
		814	}
		815	else
		816	#endif
		817	{
		818	rt_now = ev_time ();
		819
		820	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		821	{
		822	periodics_reschedule (EV_A_ rt_now - mn_now);
		823
		824	/* adjust timers. this is easy, as the offset is the same for all */
		825	for (i = 0; i < timercnt; ++i)
		826	timers [i]->at += diff;
		827	}
		828
		829	mn_now = rt_now;
		830	}
		831	}
		832
		833	void
		834	ev_ref (EV_P)
		835	{
		836	++activecnt;
		837	}
		838
		839	void
		840	ev_unref (EV_P)
		841	{
		842	--activecnt;
		843	}
		844
		845	static int loop_done;
		846
		847	void
280	int ev_loop (int flags)	848	ev_loop (EV_P_ int flags)
281	{	849	{
282	double block;	850	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	851	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
284		852
285	do	853	do
286	{	854	{
		855	/* queue check watchers (and execute them) */
		856	if (expect_false (preparecnt))
		857	{
		858	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		859	call_pending (EV_A);
		860	}
		861
287	/* update fd-related kernel structures */	862	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	863	fd_reify (EV_A);
289		864
290	/* calculate blocking time */	865	/* calculate blocking time */
		866
		867	/* we only need this for !monotonic clockor timers, but as we basically
		868	always have timers, we just calculate it always */
		869	#if EV_USE_MONOTONIC
		870	if (expect_true (have_monotonic))
		871	time_update_monotonic (EV_A);
		872	else
		873	#endif
		874	{
291	ev_now = ev_time ();	875	rt_now = ev_time ();
		876	mn_now = rt_now;
		877	}
292		878
293	if (flags & EVLOOP_NONBLOCK)	879	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	880	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	881	else
298	{	882	{
		883	block = MAX_BLOCKTIME;
		884
		885	if (timercnt)
		886	{
299	block = timers [0]->at - ev_now + method_fudge;	887	ev_tstamp to = timers [0]->at - mn_now + method_fudge;
		888	if (block > to) block = to;
		889	}
		890
		891	if (periodiccnt)
		892	{
		893	ev_tstamp to = periodics [0]->at - rt_now + method_fudge;
		894	if (block > to) block = to;
		895	}
		896
300	if (block < 0.) block = 0.;	897	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	898	}
303		899
304	method_poll (block);	900	method_poll (EV_A_ block);
305		901
		902	/* update rt_now, do magic */
		903	time_update (EV_A);
		904
306	/* put pending timers into pendign queue and reschedule them */	905	/* queue pending timers and reschedule them */
307	timer_reify ();	906	timers_reify (EV_A); /* relative timers called last */
		907	periodics_reify (EV_A); /* absolute timers called first */
308		908
309	ev_now = ev_time ();	909	/* queue idle watchers unless io or timers are pending */
		910	if (!pendingcnt)
		911	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		912
		913	/* queue check watchers, to be executed first */
		914	if (checkcnt)
		915	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		916
310	call_pending ();	917	call_pending (EV_A);
311	}	918	}
312	while (!ev_loop_done);	919	while (activecnt && !loop_done);
313	}
314		920
315	static void	921	if (loop_done != 2)
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	922	loop_done = 0;
		923	}
		924
		925	void
		926	ev_unloop (EV_P_ int how)
		927	{
		928	loop_done = how;
		929	}
		930
		931	/*****************************************************************************/
		932
		933	inline void
		934	wlist_add (WL *head, WL elem)
317	{	935	{
318	elem->next = *head;	936	elem->next = *head;
319	*head = elem;	937	*head = elem;
320	}	938	}
321		939
322	static void	940	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	941	wlist_del (WL *head, WL elem)
324	{	942	{
325	while (*head)	943	while (*head)
326	{	944	{
327	if (*head == elem)	945	if (*head == elem)
328	{	946	{
…		…
332		950
333	head = &(*head)->next;	951	head = &(*head)->next;
334	}	952	}
335	}	953	}
336		954
337	static void	955	inline void
338	ev_start (struct ev_watcher *w, int active)	956	ev_clear_pending (EV_P_ W w)
339	{	957	{
		958	if (w->pending)
		959	{
		960	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	961	w->pending = 0;
		962	}
		963	}
		964
		965	inline void
		966	ev_start (EV_P_ W w, int active)
		967	{
		968	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		969	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		970
341	w->active = active;	971	w->active = active;
		972	ev_ref (EV_A);
342	}	973	}
343		974
344	static void	975	inline void
345	ev_stop (struct ev_watcher *w)	976	ev_stop (EV_P_ W w)
346	{	977	{
347	if (w->pending)	978	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	979	w->active = 0;
351	/* nop */
352	}	980	}
353		981
		982	/*****************************************************************************/
		983
354	void	984	void
355	evio_start (struct ev_io *w)	985	ev_io_start (EV_P_ struct ev_io *w)
356	{	986	{
		987	int fd = w->fd;
		988
357	if (ev_is_active (w))	989	if (ev_is_active (w))
358	return;	990	return;
359		991
360	int fd = w->fd;	992	assert (("ev_io_start called with negative fd", fd >= 0));
361		993
362	ev_start ((struct ev_watcher *)w, 1);	994	ev_start (EV_A_ (W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	995	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	996	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		997
366	++fdchangecnt;	998	fd_change (EV_A_ fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	999	}
370		1000
371	void	1001	void
372	evio_stop (struct ev_io *w)	1002	ev_io_stop (EV_P_ struct ev_io *w)
373	{	1003	{
		1004	ev_clear_pending (EV_A_ (W)w);
374	if (!ev_is_active (w))	1005	if (!ev_is_active (w))
375	return;	1006	return;
376		1007
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1008	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	1009	ev_stop (EV_A_ (W)w);
379		1010
380	++fdchangecnt;	1011	fd_change (EV_A_ w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	1012	}
384		1013
385	void	1014	void
386	evtimer_start (struct ev_timer *w)	1015	ev_timer_start (EV_P_ struct ev_timer *w)
387	{	1016	{
388	if (ev_is_active (w))	1017	if (ev_is_active (w))
389	return;	1018	return;
390		1019
391	if (w->is_abs)
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;	1020	w->at += mn_now;
399		1021
400	ev_start ((struct ev_watcher *)w, ++timercnt);	1022	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1023
		1024	ev_start (EV_A_ (W)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );	1025	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;	1026	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);	1027	upheap ((WT *)timers, timercnt - 1);
404	}	1028	}
405		1029
406	void	1030	void
407	evtimer_stop (struct ev_timer *w)	1031	ev_timer_stop (EV_P_ struct ev_timer *w)
408	{	1032	{
		1033	ev_clear_pending (EV_A_ (W)w);
409	if (!ev_is_active (w))	1034	if (!ev_is_active (w))
410	return;	1035	return;
411		1036
412	if (w->active < timercnt--)	1037	if (w->active < timercnt--)
413	{	1038	{
414	timers [w->active - 1] = timers [timercnt];	1039	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);	1040	downheap ((WT *)timers, timercnt, w->active - 1);
416	}	1041	}
417		1042
418	ev_stop ((struct ev_watcher *)w);	1043	w->at = w->repeat;
419	}
420		1044
		1045	ev_stop (EV_A_ (W)w);
		1046	}
		1047
421	void	1048	void
422	evsignal_start (struct ev_signal *w)	1049	ev_timer_again (EV_P_ struct ev_timer *w)
423	{	1050	{
424	if (ev_is_active (w))	1051	if (ev_is_active (w))
425	return;	1052	{
		1053	if (w->repeat)
		1054	{
		1055	w->at = mn_now + w->repeat;
		1056	downheap ((WT *)timers, timercnt, w->active - 1);
		1057	}
		1058	else
		1059	ev_timer_stop (EV_A_ w);
		1060	}
		1061	else if (w->repeat)
		1062	ev_timer_start (EV_A_ w);
		1063	}
426		1064
427	ev_start ((struct ev_watcher *)w, 1);	1065	void
		1066	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1067	{
		1068	if (ev_is_active (w))
		1069	return;
		1070
		1071	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1072
		1073	/* this formula differs from the one in periodic_reify because we do not always round up */
		1074	if (w->interval)
		1075	w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
		1076
		1077	ev_start (EV_A_ (W)w, ++periodiccnt);
		1078	array_needsize (periodics, periodicmax, periodiccnt, );
		1079	periodics [periodiccnt - 1] = w;
		1080	upheap ((WT *)periodics, periodiccnt - 1);
		1081	}
		1082
		1083	void
		1084	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1085	{
		1086	ev_clear_pending (EV_A_ (W)w);
		1087	if (!ev_is_active (w))
		1088	return;
		1089
		1090	if (w->active < periodiccnt--)
		1091	{
		1092	periodics [w->active - 1] = periodics [periodiccnt];
		1093	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		1094	}
		1095
		1096	ev_stop (EV_A_ (W)w);
		1097	}
		1098
		1099	#ifndef SA_RESTART
		1100	# define SA_RESTART 0
		1101	#endif
		1102
		1103	void
		1104	ev_signal_start (EV_P_ struct ev_signal *w)
		1105	{
		1106	if (ev_is_active (w))
		1107	return;
		1108
		1109	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1110
		1111	ev_start (EV_A_ (W)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);	1112	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1113	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
430	}
431		1114
		1115	if (!w->next)
		1116	{
		1117	struct sigaction sa;
		1118	sa.sa_handler = sighandler;
		1119	sigfillset (&sa.sa_mask);
		1120	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1121	sigaction (w->signum, &sa, 0);
		1122	}
		1123	}
		1124
432	void	1125	void
433	evsignal_stop (struct ev_signal *w)	1126	ev_signal_stop (EV_P_ struct ev_signal *w)
434	{	1127	{
		1128	ev_clear_pending (EV_A_ (W)w);
435	if (!ev_is_active (w))	1129	if (!ev_is_active (w))
436	return;	1130	return;
437		1131
438	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1132	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
439	ev_stop ((struct ev_watcher *)w);	1133	ev_stop (EV_A_ (W)w);
		1134
		1135	if (!signals [w->signum - 1].head)
		1136	signal (w->signum, SIG_DFL);
		1137	}
		1138
		1139	void
		1140	ev_idle_start (EV_P_ struct ev_idle *w)
		1141	{
		1142	if (ev_is_active (w))
		1143	return;
		1144
		1145	ev_start (EV_A_ (W)w, ++idlecnt);
		1146	array_needsize (idles, idlemax, idlecnt, );
		1147	idles [idlecnt - 1] = w;
		1148	}
		1149
		1150	void
		1151	ev_idle_stop (EV_P_ struct ev_idle *w)
		1152	{
		1153	ev_clear_pending (EV_A_ (W)w);
		1154	if (ev_is_active (w))
		1155	return;
		1156
		1157	idles [w->active - 1] = idles [--idlecnt];
		1158	ev_stop (EV_A_ (W)w);
		1159	}
		1160
		1161	void
		1162	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1163	{
		1164	if (ev_is_active (w))
		1165	return;
		1166
		1167	ev_start (EV_A_ (W)w, ++preparecnt);
		1168	array_needsize (prepares, preparemax, preparecnt, );
		1169	prepares [preparecnt - 1] = w;
		1170	}
		1171
		1172	void
		1173	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1174	{
		1175	ev_clear_pending (EV_A_ (W)w);
		1176	if (ev_is_active (w))
		1177	return;
		1178
		1179	prepares [w->active - 1] = prepares [--preparecnt];
		1180	ev_stop (EV_A_ (W)w);
		1181	}
		1182
		1183	void
		1184	ev_check_start (EV_P_ struct ev_check *w)
		1185	{
		1186	if (ev_is_active (w))
		1187	return;
		1188
		1189	ev_start (EV_A_ (W)w, ++checkcnt);
		1190	array_needsize (checks, checkmax, checkcnt, );
		1191	checks [checkcnt - 1] = w;
		1192	}
		1193
		1194	void
		1195	ev_check_stop (EV_P_ struct ev_check *w)
		1196	{
		1197	ev_clear_pending (EV_A_ (W)w);
		1198	if (ev_is_active (w))
		1199	return;
		1200
		1201	checks [w->active - 1] = checks [--checkcnt];
		1202	ev_stop (EV_A_ (W)w);
		1203	}
		1204
		1205	void
		1206	ev_child_start (EV_P_ struct ev_child *w)
		1207	{
		1208	if (ev_is_active (w))
		1209	return;
		1210
		1211	ev_start (EV_A_ (W)w, 1);
		1212	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1213	}
		1214
		1215	void
		1216	ev_child_stop (EV_P_ struct ev_child *w)
		1217	{
		1218	ev_clear_pending (EV_A_ (W)w);
		1219	if (ev_is_active (w))
		1220	return;
		1221
		1222	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1223	ev_stop (EV_A_ (W)w);
440	}	1224	}
441		1225
442	/*****************************************************************************/	1226	/*****************************************************************************/
		1227
		1228	struct ev_once
		1229	{
		1230	struct ev_io io;
		1231	struct ev_timer to;
		1232	void (*cb)(int revents, void *arg);
		1233	void *arg;
		1234	};
		1235
		1236	static void
		1237	once_cb (EV_P_ struct ev_once *once, int revents)
		1238	{
		1239	void (*cb)(int revents, void *arg) = once->cb;
		1240	void *arg = once->arg;
		1241
		1242	ev_io_stop (EV_A_ &once->io);
		1243	ev_timer_stop (EV_A_ &once->to);
		1244	free (once);
		1245
		1246	cb (revents, arg);
		1247	}
		1248
		1249	static void
		1250	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1251	{
		1252	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1253	}
		1254
		1255	static void
		1256	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1257	{
		1258	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1259	}
		1260
		1261	void
		1262	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1263	{
		1264	struct ev_once *once = malloc (sizeof (struct ev_once));
		1265
		1266	if (!once)
		1267	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1268	else
		1269	{
		1270	once->cb = cb;
		1271	once->arg = arg;
		1272
		1273	ev_watcher_init (&once->io, once_cb_io);
		1274	if (fd >= 0)
		1275	{
		1276	ev_io_set (&once->io, fd, events);
		1277	ev_io_start (EV_A_ &once->io);
		1278	}
		1279
		1280	ev_watcher_init (&once->to, once_cb_to);
		1281	if (timeout >= 0.)
		1282	{
		1283	ev_timer_set (&once->to, timeout, 0.);
		1284	ev_timer_start (EV_A_ &once->to);
		1285	}
		1286	}
		1287	}
		1288
		1289	/*****************************************************************************/
		1290
443	#if 1	1291	#if 0
		1292
		1293	struct ev_io wio;
444		1294
445	static void	1295	static void
446	sin_cb (struct ev_io *w, int revents)	1296	sin_cb (struct ev_io *w, int revents)
447	{	1297	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1298	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}	1299	}
450		1300
451	static void	1301	static void
452	ocb (struct ev_timer *w, int revents)	1302	ocb (struct ev_timer *w, int revents)
453	{	1303	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1304	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1305	ev_timer_stop (w);
		1306	ev_timer_start (w);
		1307	}
		1308
		1309	static void
		1310	scb (struct ev_signal *w, int revents)
		1311	{
		1312	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1313	ev_io_stop (&wio);
		1314	ev_io_start (&wio);
		1315	}
		1316
		1317	static void
		1318	gcb (struct ev_signal *w, int revents)
		1319	{
		1320	fprintf (stderr, "generic %x\n", revents);
		1321
455	}	1322	}
456		1323
457	int main (void)	1324	int main (void)
458	{	1325	{
459	struct ev_io sin;
460
461	ev_init (0);	1326	ev_init (0);
462		1327
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);	1328	ev_io_init (&wio, sin_cb, 0, EV_READ);
465	evio_start (&sin);	1329	ev_io_start (&wio);
466		1330
467	struct ev_timer t[1000];	1331	struct ev_timer t[10000];
468		1332
		1333	#if 0
469	int i;	1334	int i;
470	for (i = 0; i < 1000; ++i)	1335	for (i = 0; i < 10000; ++i)
471	{	1336	{
472	struct ev_timer *w = t + i;	1337	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);	1338	ev_watcher_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);	1339	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
475	evtimer_start (w);	1340	ev_timer_start (w);
476	if (drand48 () < 0.5)	1341	if (drand48 () < 0.5)
477	evtimer_stop (w);	1342	ev_timer_stop (w);
478	}	1343	}
		1344	#endif
		1345
		1346	struct ev_timer t1;
		1347	ev_timer_init (&t1, ocb, 5, 10);
		1348	ev_timer_start (&t1);
		1349
		1350	struct ev_signal sig;
		1351	ev_signal_init (&sig, scb, SIGQUIT);
		1352	ev_signal_start (&sig);
		1353
		1354	struct ev_check cw;
		1355	ev_check_init (&cw, gcb);
		1356	ev_check_start (&cw);
		1357
		1358	struct ev_idle iw;
		1359	ev_idle_init (&iw, gcb);
		1360	ev_idle_start (&iw);
479		1361
480	ev_loop (0);	1362	ev_loop (0);
481		1363
482	return 0;	1364	return 0;
483	}	1365	}

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