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Comparing libev/ev.c (file contents):
Revision 1.2 by root, Tue Oct 30 21:42:12 2007 UTC vs.
Revision 1.44 by root, Fri Nov 2 20:59:14 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	#if EV_USE_CONFIG_H
		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	#include <sys/wait.h>
7	#include <sys/time.h>	48	#include <sys/time.h>
8	#include <time.h>	49	#include <time.h>
9		50
		51	/**/
		52
		53	#ifndef EV_USE_MONOTONIC
		54	# define EV_USE_MONOTONIC 1
		55	#endif
		56
		57	#ifndef EV_USE_SELECT
		58	# define EV_USE_SELECT 1
		59	#endif
		60
		61	#ifndef EV_USE_POLL
		62	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		63	#endif
		64
		65	#ifndef EV_USE_EPOLL
		66	# define EV_USE_EPOLL 0
		67	#endif
		68
		69	#ifndef EV_USE_KQUEUE
		70	# define EV_USE_KQUEUE 0
		71	#endif
		72
		73	#ifndef EV_USE_REALTIME
		74	# define EV_USE_REALTIME 1
		75	#endif
		76
		77	/**/
		78
10	#ifdef CLOCK_MONOTONIC	79	#ifndef CLOCK_MONOTONIC
		80	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	81	# define EV_USE_MONOTONIC 0
12	#endif	82	#endif
13		83
14	#define HAVE_EPOLL 1	84	#ifndef CLOCK_REALTIME
		85	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	86	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	87	#endif
17		88
18	#define MAX_BLOCKTIME 60.	89	/**/
		90
		91	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		92	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		93	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		94	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
19		95
20	#include "ev.h"	96	#include "ev.h"
21		97
		98	#if __GNUC__ >= 3
		99	# define expect(expr,value) __builtin_expect ((expr),(value))
		100	# define inline inline
		101	#else
		102	# define expect(expr,value) (expr)
		103	# define inline static
		104	#endif
		105
		106	#define expect_false(expr) expect ((expr) != 0, 0)
		107	#define expect_true(expr) expect ((expr) != 0, 1)
		108
		109	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		110	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		111
22	struct ev_watcher {	112	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	113	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	114	typedef struct ev_watcher_time *WT;
28	};
29		115
		116	static ev_tstamp now_floor, now, diff; /* monotonic clock */
30	ev_tstamp ev_now;	117	ev_tstamp ev_now;
31	int ev_method;	118	int ev_method;
32		119
33	static int have_monotonic; /* runtime */	120	static int have_monotonic; /* runtime */
34		121
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	122	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
36	static void (*method_reify)(void);	123	static void (*method_modify)(int fd, int oev, int nev);
37	static void (*method_poll)(ev_tstamp timeout);	124	static void (*method_poll)(ev_tstamp timeout);
		125
		126	/*****************************************************************************/
38		127
39	ev_tstamp	128	ev_tstamp
40	ev_time (void)	129	ev_time (void)
41	{	130	{
42	#if HAVE_REALTIME	131	#if EV_USE_REALTIME
43	struct timespec ts;	132	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	133	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	134	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	135	#else
47	struct timeval tv;	136	struct timeval tv;
…		…
51	}	140	}
52		141
53	static ev_tstamp	142	static ev_tstamp
54	get_clock (void)	143	get_clock (void)
55	{	144	{
56	#if HAVE_MONOTONIC	145	#if EV_USE_MONOTONIC
57	if (have_monotonic)	146	if (expect_true (have_monotonic))
58	{	147	{
59	struct timespec ts;	148	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	149	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	150	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	151	}
63	#endif	152	#endif
64		153
65	return ev_time ();	154	return ev_time ();
66	}	155	}
67		156
		157	#define array_roundsize(base,n) ((n) | 4 & ~3)
		158
68	#define array_needsize(base,cur,cnt,init) \	159	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	160	if (expect_false ((cnt) > cur)) \
70	{ \	161	{ \
71	int newcnt = cur ? cur << 1 : 16; \	162	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	163	do \
		164	{ \
		165	newcnt = array_roundsize (base, newcnt << 1); \
		166	} \
		167	while ((cnt) > newcnt); \
		168	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	169	base = realloc (base, sizeof (*base) * (newcnt)); \
74	init (base + cur, newcnt - cur); \	170	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	171	cur = newcnt; \
76	}	172	}
77		173
		174	/*****************************************************************************/
		175
78	typedef struct	176	typedef struct
79	{	177	{
80	struct ev_io *head;	178	struct ev_io *head;
81	unsigned char wev, rev; /* want, received event set */	179	unsigned char events;
		180	unsigned char reify;
82	} ANFD;	181	} ANFD;
83		182
84	static ANFD *anfds;	183	static ANFD *anfds;
85	static int anfdmax;	184	static int anfdmax;
86		185
		186	static void
		187	anfds_init (ANFD *base, int count)
		188	{
		189	while (count--)
		190	{
		191	base->head = 0;
		192	base->events = EV_NONE;
		193	base->reify = 0;
		194
		195	++base;
		196	}
		197	}
		198
		199	typedef struct
		200	{
		201	W w;
		202	int events;
		203	} ANPENDING;
		204
		205	static ANPENDING *pendings [NUMPRI];
		206	static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
		207
		208	static void
		209	event (W w, int events)
		210	{
		211	if (w->pending)
		212	{
		213	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		214	return;
		215	}
		216
		217	w->pending = ++pendingcnt [ABSPRI (w)];
		218	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
		219	pendings [ABSPRI (w)][w->pending - 1].w = w;
		220	pendings [ABSPRI (w)][w->pending - 1].events = events;
		221	}
		222
		223	static void
		224	queue_events (W *events, int eventcnt, int type)
		225	{
		226	int i;
		227
		228	for (i = 0; i < eventcnt; ++i)
		229	event (events [i], type);
		230	}
		231
		232	static void
		233	fd_event (int fd, int events)
		234	{
		235	ANFD *anfd = anfds + fd;
		236	struct ev_io *w;
		237
		238	for (w = anfd->head; w; w = w->next)
		239	{
		240	int ev = w->events & events;
		241
		242	if (ev)
		243	event ((W)w, ev);
		244	}
		245	}
		246
		247	/*****************************************************************************/
		248
87	static int *fdchanges;	249	static int *fdchanges;
88	static int fdchangemax, fdchangecnt;	250	static int fdchangemax, fdchangecnt;
89		251
90	static void	252	static void
91	anfds_init (ANFD *base, int count)	253	fd_reify (void)
92	{	254	{
93	while (count--)	255	int i;
94	{	256
95	base->head = 0;	257	for (i = 0; i < fdchangecnt; ++i)
96	base->wev = base->rev = EV_NONE;
97	++base;
98	}	258	{
99	}	259	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;	260	ANFD *anfd = anfds + fd;
		261	struct ev_io *w;
		262
		263	int events = 0;
		264
		265	for (w = anfd->head; w; w = w->next)
		266	events |= w->events;
		267
		268	anfd->reify = 0;
		269
		270	if (anfd->events != events)
		271	{
		272	method_modify (fd, anfd->events, events);
		273	anfd->events = events;
		274	}
		275	}
		276
		277	fdchangecnt = 0;
		278	}
		279
		280	static void
		281	fd_change (int fd)
		282	{
		283	if (anfds [fd].reify || fdchangecnt < 0)
		284	return;
		285
		286	anfds [fd].reify = 1;
		287
		288	++fdchangecnt;
		289	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		290	fdchanges [fdchangecnt - 1] = fd;
		291	}
		292
		293	static void
		294	fd_kill (int fd)
		295	{
123	struct ev_io *w;	296	struct ev_io *w;
124		297
125	for (w = anfd->head; w; w = w->next)	298	printf ("killing fd %d\n", fd);//D
		299	while ((w = anfds [fd].head))
		300	{
		301	ev_io_stop (w);
		302	event ((W)w, EV_ERROR | EV_READ | EV_WRITE);
		303	}
		304	}
		305
		306	/* called on EBADF to verify fds */
		307	static void
		308	fd_ebadf (void)
		309	{
		310	int fd;
		311
		312	for (fd = 0; fd < anfdmax; ++fd)
		313	if (anfds [fd].events)
		314	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		315	fd_kill (fd);
		316	}
		317
		318	/* called on ENOMEM in select/poll to kill some fds and retry */
		319	static void
		320	fd_enomem (void)
		321	{
		322	int fd = anfdmax;
		323
		324	while (fd--)
		325	if (anfds [fd].events)
126	{	326	{
127	int ev = w->events & events;	327	close (fd);
128		328	fd_kill (fd);
129	if (ev)	329	return;
130	event ((struct ev_watcher *)w, ev);
131	}	330	}
132	}	331	}
		332
		333	/*****************************************************************************/
133		334
134	static struct ev_timer **timers;	335	static struct ev_timer **timers;
135	static int timermax, timercnt;	336	static int timermax, timercnt;
136		337
		338	static struct ev_periodic **periodics;
		339	static int periodicmax, periodiccnt;
		340
137	static void	341	static void
138	upheap (int k)	342	upheap (WT *timers, int k)
139	{	343	{
140	struct ev_timer *w = timers [k];	344	WT w = timers [k];
141		345
142	while (k && timers [k >> 1]->at > w->at)	346	while (k && timers [k >> 1]->at > w->at)
143	{	347	{
144	timers [k] = timers [k >> 1];	348	timers [k] = timers [k >> 1];
145	timers [k]->active = k + 1;	349	timers [k]->active = k + 1;
…		…
150	timers [k]->active = k + 1;	354	timers [k]->active = k + 1;
151		355
152	}	356	}
153		357
154	static void	358	static void
155	downheap (int k)	359	downheap (WT *timers, int N, int k)
156	{	360	{
157	struct ev_timer *w = timers [k];	361	WT w = timers [k];
158		362
159	while (k < (timercnt >> 1))	363	while (k < (N >> 1))
160	{	364	{
161	int j = k << 1;	365	int j = k << 1;
162		366
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	367	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
164	++j;	368	++j;
165		369
166	if (w->at <= timers [j]->at)	370	if (w->at <= timers [j]->at)
167	break;	371	break;
168		372
…		…
173		377
174	timers [k] = w;	378	timers [k] = w;
175	timers [k]->active = k + 1;	379	timers [k]->active = k + 1;
176	}	380	}
177		381
178	static struct ev_signal **signals;	382	/*****************************************************************************/
		383
		384	typedef struct
		385	{
		386	struct ev_signal *head;
		387	sig_atomic_t volatile gotsig;
		388	} ANSIG;
		389
		390	static ANSIG *signals;
179	static int signalmax, signalcnt;	391	static int signalmax;
180		392
		393	static int sigpipe [2];
		394	static sig_atomic_t volatile gotsig;
		395	static struct ev_io sigev;
		396
181	static void	397	static void
182	signals_init (struct ev_signal **base, int count)	398	signals_init (ANSIG *base, int count)
183	{	399	{
184	while (count--)	400	while (count--)
185	*base++ = 0;	401	{
186	}	402	base->head = 0;
		403	base->gotsig = 0;
187		404
		405	++base;
		406	}
		407	}
		408
		409	static void
		410	sighandler (int signum)
		411	{
		412	signals [signum - 1].gotsig = 1;
		413
		414	if (!gotsig)
		415	{
		416	gotsig = 1;
		417	write (sigpipe [1], &signum, 1);
		418	}
		419	}
		420
		421	static void
		422	sigcb (struct ev_io *iow, int revents)
		423	{
		424	struct ev_signal *w;
		425	int signum;
		426
		427	read (sigpipe [0], &revents, 1);
		428	gotsig = 0;
		429
		430	for (signum = signalmax; signum--; )
		431	if (signals [signum].gotsig)
		432	{
		433	signals [signum].gotsig = 0;
		434
		435	for (w = signals [signum].head; w; w = w->next)
		436	event ((W)w, EV_SIGNAL);
		437	}
		438	}
		439
		440	static void
		441	siginit (void)
		442	{
		443	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		444	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		445
		446	/* rather than sort out wether we really need nb, set it */
		447	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		448	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		449
		450	ev_io_set (&sigev, sigpipe [0], EV_READ);
		451	ev_io_start (&sigev);
		452	}
		453
		454	/*****************************************************************************/
		455
		456	static struct ev_idle **idles;
		457	static int idlemax, idlecnt;
		458
		459	static struct ev_prepare **prepares;
		460	static int preparemax, preparecnt;
		461
		462	static struct ev_check **checks;
		463	static int checkmax, checkcnt;
		464
		465	/*****************************************************************************/
		466
		467	static struct ev_child *childs [PID_HASHSIZE];
		468	static struct ev_signal childev;
		469
		470	#ifndef WCONTINUED
		471	# define WCONTINUED 0
		472	#endif
		473
		474	static void
		475	childcb (struct ev_signal *sw, int revents)
		476	{
		477	struct ev_child *w;
		478	int pid, status;
		479
		480	while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)
		481	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		482	if (w->pid == pid || !w->pid)
		483	{
		484	w->status = status;
		485	event ((W)w, EV_CHILD);
		486	}
		487	}
		488
		489	/*****************************************************************************/
		490
		491	#if EV_USE_KQUEUE
		492	# include "ev_kqueue.c"
		493	#endif
188	#if HAVE_EPOLL	494	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	495	# include "ev_epoll.c"
190	#endif	496	#endif
		497	#if EV_USE_POLL
		498	# include "ev_poll.c"
		499	#endif
191	#if HAVE_SELECT	500	#if EV_USE_SELECT
192	# include "ev_select.c"	501	# include "ev_select.c"
193	#endif	502	#endif
194		503
		504	int
		505	ev_version_major (void)
		506	{
		507	return EV_VERSION_MAJOR;
		508	}
		509
		510	int
		511	ev_version_minor (void)
		512	{
		513	return EV_VERSION_MINOR;
		514	}
		515
		516	/* return true if we are running with elevated privileges and ignore env variables */
		517	static int
		518	enable_secure ()
		519	{
		520	return getuid () != geteuid ()
		521	|| getgid () != getegid ();
		522	}
		523
195	int ev_init (int flags)	524	int ev_init (int methods)
196	{	525	{
		526	if (!ev_method)
		527	{
197	#if HAVE_MONOTONIC	528	#if EV_USE_MONOTONIC
198	{	529	{
199	struct timespec ts;	530	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	531	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	532	have_monotonic = 1;
202	}	533	}
203	#endif	534	#endif
204		535
205	ev_now = ev_time ();	536	ev_now = ev_time ();
		537	now = get_clock ();
		538	now_floor = now;
		539	diff = ev_now - now;
206		540
		541	if (pipe (sigpipe))
		542	return 0;
		543
		544	if (methods == EVMETHOD_AUTO)
		545	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		546	methods = atoi (getenv ("LIBEV_METHODS"));
		547	else
		548	methods = EVMETHOD_ANY;
		549
		550	ev_method = 0;
		551	#if EV_USE_KQUEUE
		552	if (!ev_method && (methods & EVMETHOD_KQUEUE)) kqueue_init (methods);
		553	#endif
207	#if HAVE_EPOLL	554	#if EV_USE_EPOLL
208	if (epoll_init (flags))	555	if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods);
209	return ev_method;
210	#endif	556	#endif
		557	#if EV_USE_POLL
		558	if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
		559	#endif
211	#if HAVE_SELECT	560	#if EV_USE_SELECT
212	if (select_init (flags))	561	if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
213	return ev_method;
214	#endif	562	#endif
215		563
216	ev_method = EVMETHOD_NONE;	564	if (ev_method)
		565	{
		566	ev_watcher_init (&sigev, sigcb);
		567	siginit ();
		568
		569	ev_signal_init (&childev, childcb, SIGCHLD);
		570	ev_signal_start (&childev);
		571	}
		572	}
		573
217	return ev_method;	574	return ev_method;
218	}	575	}
219		576
220	void ev_prefork (void)	577	/*****************************************************************************/
221	{
222	}
223		578
		579	void
		580	ev_fork_prepare (void)
		581	{
		582	/* nop */
		583	}
		584
		585	void
224	void ev_postfork_parent (void)	586	ev_fork_parent (void)
225	{	587	{
		588	/* nop */
226	}	589	}
227		590
		591	void
228	void ev_postfork_child (void)	592	ev_fork_child (void)
229	{	593	{
230	#if HAVE_EPOLL	594	#if EV_USE_EPOLL
		595	if (ev_method == EVMETHOD_EPOLL)
231	epoll_postfork_child ();	596	epoll_postfork_child ();
232	#endif	597	#endif
233	}
234		598
		599	ev_io_stop (&sigev);
		600	close (sigpipe [0]);
		601	close (sigpipe [1]);
		602	pipe (sigpipe);
		603	siginit ();
		604	}
		605
		606	/*****************************************************************************/
		607
235	static void	608	static void
236	call_pending ()	609	call_pending (void)
		610	{
		611	int pri;
		612
		613	for (pri = NUMPRI; pri--; )
		614	while (pendingcnt [pri])
		615	{
		616	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		617
		618	if (p->w)
		619	{
		620	p->w->pending = 0;
		621	p->w->cb (p->w, p->events);
		622	}
		623	}
		624	}
		625
		626	static void
		627	timers_reify (void)
		628	{
		629	while (timercnt && timers [0]->at <= now)
		630	{
		631	struct ev_timer *w = timers [0];
		632
		633	/* first reschedule or stop timer */
		634	if (w->repeat)
		635	{
		636	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
		637	w->at = now + w->repeat;
		638	downheap ((WT *)timers, timercnt, 0);
		639	}
		640	else
		641	ev_timer_stop (w); /* nonrepeating: stop timer */
		642
		643	event ((W)w, EV_TIMEOUT);
		644	}
		645	}
		646
		647	static void
		648	periodics_reify (void)
		649	{
		650	while (periodiccnt && periodics [0]->at <= ev_now)
		651	{
		652	struct ev_periodic *w = periodics [0];
		653
		654	/* first reschedule or stop timer */
		655	if (w->interval)
		656	{
		657	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		658	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
		659	downheap ((WT *)periodics, periodiccnt, 0);
		660	}
		661	else
		662	ev_periodic_stop (w); /* nonrepeating: stop timer */
		663
		664	event ((W)w, EV_PERIODIC);
		665	}
		666	}
		667
		668	static void
		669	periodics_reschedule (ev_tstamp diff)
237	{	670	{
238	int i;	671	int i;
239		672
		673	/* adjust periodics after time jump */
240	for (i = 0; i < pendingcnt; ++i)	674	for (i = 0; i < periodiccnt; ++i)
241	{	675	{
242	ANPENDING *p = pendings + i;	676	struct ev_periodic *w = periodics [i];
243		677
244	if (p->w)	678	if (w->interval)
245	{
246	p->w->pending = 0;
247	p->w->cb (p->w, p->events);
248	}	679	{
249	}	680	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
250		681
251	pendingcnt = 0;	682	if (fabs (diff) >= 1e-4)
252	}	683	{
		684	ev_periodic_stop (w);
		685	ev_periodic_start (w);
253		686
254	static void	687	i = 0; /* restart loop, inefficient, but time jumps should be rare */
255	timer_reify (void)	688	}
256	{
257	while (timercnt && timers [0]->at <= ev_now)
258	{
259	struct ev_timer *w = timers [0];
260
261	fprintf (stderr, "0 %f, %d c%d\n", w->at, w->active, timercnt);//D
262	/* first reschedule timer */
263	if (w->repeat)
264	{	689	}
265	fprintf (stderr, "a %f now %f repeat %f, %f\n", w->at, ev_now, w->repeat, w->repeat *1e30);//D	690	}
266	if (w->is_abs)	691	}
267	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
268	else
269	w->at = ev_now + w->repeat;
270		692
271	fprintf (stderr, "b %f\n", w->at);//D	693	static int
		694	time_update_monotonic (void)
		695	{
		696	now = get_clock ();
272		697
273	downheap (0);	698	if (expect_true (now - now_floor < MIN_TIMEJUMP * .5))
		699	{
		700	ev_now = now + diff;
		701	return 0;
		702	}
		703	else
		704	{
		705	now_floor = now;
		706	ev_now = ev_time ();
		707	return 1;
		708	}
		709	}
		710
		711	static void
		712	time_update (void)
		713	{
		714	int i;
		715
		716	#if EV_USE_MONOTONIC
		717	if (expect_true (have_monotonic))
		718	{
		719	if (time_update_monotonic ())
274	}	720	{
		721	ev_tstamp odiff = diff;
		722
		723	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		724	{
		725	diff = ev_now - now;
		726
		727	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		728	return; /* all is well */
		729
		730	ev_now = ev_time ();
		731	now = get_clock ();
		732	now_floor = now;
		733	}
		734
		735	periodics_reschedule (diff - odiff);
		736	/* no timer adjustment, as the monotonic clock doesn't jump */
		737	}
		738	}
		739	else
		740	#endif
		741	{
		742	ev_now = ev_time ();
		743
		744	if (expect_false (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		745	{
		746	periodics_reschedule (ev_now - now);
		747
		748	/* adjust timers. this is easy, as the offset is the same for all */
		749	for (i = 0; i < timercnt; ++i)
		750	timers [i]->at += diff;
		751	}
		752
		753	now = ev_now;
		754	}
		755	}
		756
		757	int ev_loop_done;
		758
		759	void ev_loop (int flags)
		760	{
		761	double block;
		762	ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
		763
		764	do
		765	{
		766	/* queue check watchers (and execute them) */
		767	if (expect_false (preparecnt))
		768	{
		769	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		770	call_pending ();
		771	}
		772
		773	/* update fd-related kernel structures */
		774	fd_reify ();
		775
		776	/* calculate blocking time */
		777
		778	/* we only need this for !monotonic clockor timers, but as we basically
		779	always have timers, we just calculate it always */
		780	#if EV_USE_MONOTONIC
		781	if (expect_true (have_monotonic))
		782	time_update_monotonic ();
275	else	783	else
276	{	784	#endif
277	fprintf (stderr, "c %f, %d c%d\n", w->at, w->active, timercnt);//D
278	evtimer_stop (w); /* nonrepeating: stop timer */
279	}	785	{
280
281	event ((struct ev_watcher *)w, EV_TIMEOUT);
282	}
283	}
284
285	int ev_loop_done;
286
287	int ev_loop (int flags)
288	{
289	double block;
290	ev_loop_done = flags & EVLOOP_ONESHOT;
291
292	do
293	{
294	/* update fd-related kernel structures */
295	method_reify (); fdchangecnt = 0;
296
297	/* calculate blocking time */
298	ev_now = ev_time ();	786	ev_now = ev_time ();
		787	now = ev_now;
		788	}
299		789
300	if (flags & EVLOOP_NONBLOCK)	790	if (flags & EVLOOP_NONBLOCK || idlecnt)
301	block = 0.;	791	block = 0.;
302	else if (!timercnt)
303	block = MAX_BLOCKTIME;
304	else	792	else
305	{	793	{
		794	block = MAX_BLOCKTIME;
		795
		796	if (timercnt)
		797	{
306	block = timers [0]->at - ev_now + method_fudge;	798	ev_tstamp to = timers [0]->at - now + method_fudge;
		799	if (block > to) block = to;
		800	}
		801
		802	if (periodiccnt)
		803	{
		804	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
		805	if (block > to) block = to;
		806	}
		807
307	if (block < 0.) block = 0.;	808	if (block < 0.) block = 0.;
308	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
309	}	809	}
310		810
311	fprintf (stderr, "block %f\n", block);//D
312	method_poll (block);	811	method_poll (block);
313		812
		813	/* update ev_now, do magic */
		814	time_update ();
		815
314	/* put pending timers into pendign queue and reschedule them */	816	/* queue pending timers and reschedule them */
315	timer_reify ();	817	timers_reify (); /* relative timers called last */
		818	periodics_reify (); /* absolute timers called first */
316		819
317	ev_now = ev_time ();	820	/* queue idle watchers unless io or timers are pending */
		821	if (!pendingcnt)
		822	queue_events ((W *)idles, idlecnt, EV_IDLE);
		823
		824	/* queue check watchers, to be executed first */
		825	if (checkcnt)
		826	queue_events ((W *)checks, checkcnt, EV_CHECK);
		827
318	call_pending ();	828	call_pending ();
319	}	829	}
320	while (!ev_loop_done);	830	while (!ev_loop_done);
321	}
322		831
		832	if (ev_loop_done != 2)
		833	ev_loop_done = 0;
		834	}
		835
		836	/*****************************************************************************/
		837
323	static void	838	static void
324	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	839	wlist_add (WL *head, WL elem)
325	{	840	{
326	elem->next = *head;	841	elem->next = *head;
327	*head = elem;	842	*head = elem;
328	}	843	}
329		844
330	static void	845	static void
331	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	846	wlist_del (WL *head, WL elem)
332	{	847	{
333	while (*head)	848	while (*head)
334	{	849	{
335	if (*head == elem)	850	if (*head == elem)
336	{	851	{
…		…
341	head = &(*head)->next;	856	head = &(*head)->next;
342	}	857	}
343	}	858	}
344		859
345	static void	860	static void
346	ev_start (struct ev_watcher *w, int active)	861	ev_clear_pending (W w)
347	{	862	{
		863	if (w->pending)
		864	{
		865	pendings [ABSPRI (w)][w->pending - 1].w = 0;
348	w->pending = 0;	866	w->pending = 0;
		867	}
		868	}
		869
		870	static void
		871	ev_start (W w, int active)
		872	{
		873	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		874	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		875
349	w->active = active;	876	w->active = active;
350	}	877	}
351		878
352	static void	879	static void
353	ev_stop (struct ev_watcher *w)	880	ev_stop (W w)
354	{	881	{
355	if (w->pending)
356	pendings [w->pending - 1].w = 0;
357
358	w->active = 0;	882	w->active = 0;
359	/* nop */
360	}	883	}
361		884
		885	/*****************************************************************************/
		886
362	void	887	void
363	evio_start (struct ev_io *w)	888	ev_io_start (struct ev_io *w)
364	{	889	{
		890	int fd = w->fd;
		891
365	if (ev_is_active (w))	892	if (ev_is_active (w))
366	return;	893	return;
367		894
368	int fd = w->fd;	895	assert (("ev_io_start called with negative fd", fd >= 0));
369		896
370	ev_start ((struct ev_watcher *)w, 1);	897	ev_start ((W)w, 1);
371	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	898	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
372	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	899	wlist_add ((WL *)&anfds[fd].head, (WL)w);
373		900
374	++fdchangecnt;	901	fd_change (fd);
375	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
376	fdchanges [fdchangecnt - 1] = fd;
377	}	902	}
378		903
379	void	904	void
380	evio_stop (struct ev_io *w)	905	ev_io_stop (struct ev_io *w)
381	{	906	{
		907	ev_clear_pending ((W)w);
382	if (!ev_is_active (w))	908	if (!ev_is_active (w))
383	return;	909	return;
384		910
385	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	911	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
386	ev_stop ((struct ev_watcher *)w);	912	ev_stop ((W)w);
387		913
388	++fdchangecnt;	914	fd_change (w->fd);
389	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
390	fdchanges [fdchangecnt - 1] = w->fd;
391	}	915	}
392		916
393	void	917	void
394	evtimer_start (struct ev_timer *w)	918	ev_timer_start (struct ev_timer *w)
395	{	919	{
396	if (ev_is_active (w))	920	if (ev_is_active (w))
397	return;	921	return;
398		922
399	fprintf (stderr, "t1 %f a %d\n", w->at, w->is_abs);//D
400	if (w->is_abs)
401	{
402	/* this formula differs from the one in timer_reify becuse we do not round up */
403	if (w->repeat)
404	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
405	}
406	else
407	w->at += ev_now;	923	w->at += now;
408	fprintf (stderr, "t2 %f a %d\n", w->at, w->is_abs);//D
409		924
410	ev_start ((struct ev_watcher *)w, ++timercnt);	925	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		926
		927	ev_start ((W)w, ++timercnt);
411	array_needsize (timers, timermax, timercnt, );	928	array_needsize (timers, timermax, timercnt, );
412	timers [timercnt - 1] = w;	929	timers [timercnt - 1] = w;
413	upheap (timercnt - 1);	930	upheap ((WT *)timers, timercnt - 1);
414	}	931	}
415		932
416	void	933	void
417	evtimer_stop (struct ev_timer *w)	934	ev_timer_stop (struct ev_timer *w)
418	{	935	{
419	fprintf (stderr, "-topping %d, %d\n", w->active, timercnt);//D	936	ev_clear_pending ((W)w);
420	if (!ev_is_active (w))	937	if (!ev_is_active (w))
421	return;	938	return;
422		939
423	fprintf (stderr, "stopping %d, %d\n", w->active, timercnt);//D
424	if (w->active < timercnt)	940	if (w->active < timercnt--)
425	{	941	{
426	timers [w->active - 1] = timers [--timercnt];	942	timers [w->active - 1] = timers [timercnt];
427	downheap (w->active - 1);	943	downheap ((WT *)timers, timercnt, w->active - 1);
428	}	944	}
429		945
430	ev_stop ((struct ev_watcher *)w);	946	w->at = w->repeat;
431	}
432		947
		948	ev_stop ((W)w);
		949	}
		950
433	void	951	void
434	evsignal_start (struct ev_signal *w)	952	ev_timer_again (struct ev_timer *w)
435	{	953	{
436	if (ev_is_active (w))	954	if (ev_is_active (w))
437	return;	955	{
		956	if (w->repeat)
		957	{
		958	w->at = now + w->repeat;
		959	downheap ((WT *)timers, timercnt, w->active - 1);
		960	}
		961	else
		962	ev_timer_stop (w);
		963	}
		964	else if (w->repeat)
		965	ev_timer_start (w);
		966	}
438		967
439	ev_start ((struct ev_watcher *)w, 1);	968	void
		969	ev_periodic_start (struct ev_periodic *w)
		970	{
		971	if (ev_is_active (w))
		972	return;
		973
		974	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		975
		976	/* this formula differs from the one in periodic_reify because we do not always round up */
		977	if (w->interval)
		978	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		979
		980	ev_start ((W)w, ++periodiccnt);
		981	array_needsize (periodics, periodicmax, periodiccnt, );
		982	periodics [periodiccnt - 1] = w;
		983	upheap ((WT *)periodics, periodiccnt - 1);
		984	}
		985
		986	void
		987	ev_periodic_stop (struct ev_periodic *w)
		988	{
		989	ev_clear_pending ((W)w);
		990	if (!ev_is_active (w))
		991	return;
		992
		993	if (w->active < periodiccnt--)
		994	{
		995	periodics [w->active - 1] = periodics [periodiccnt];
		996	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		997	}
		998
		999	ev_stop ((W)w);
		1000	}
		1001
		1002	void
		1003	ev_signal_start (struct ev_signal *w)
		1004	{
		1005	if (ev_is_active (w))
		1006	return;
		1007
		1008	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1009
		1010	ev_start ((W)w, 1);
440	array_needsize (signals, signalmax, w->signum, signals_init);	1011	array_needsize (signals, signalmax, w->signum, signals_init);
441	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1012	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
442	}
443		1013
		1014	if (!w->next)
		1015	{
		1016	struct sigaction sa;
		1017	sa.sa_handler = sighandler;
		1018	sigfillset (&sa.sa_mask);
		1019	sa.sa_flags = 0;
		1020	sigaction (w->signum, &sa, 0);
		1021	}
		1022	}
		1023
444	void	1024	void
445	evsignal_stop (struct ev_signal *w)	1025	ev_signal_stop (struct ev_signal *w)
446	{	1026	{
		1027	ev_clear_pending ((W)w);
447	if (!ev_is_active (w))	1028	if (!ev_is_active (w))
448	return;	1029	return;
449		1030
450	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1031	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1032	ev_stop ((W)w);
		1033
		1034	if (!signals [w->signum - 1].head)
		1035	signal (w->signum, SIG_DFL);
		1036	}
		1037
		1038	void
		1039	ev_idle_start (struct ev_idle *w)
		1040	{
		1041	if (ev_is_active (w))
		1042	return;
		1043
		1044	ev_start ((W)w, ++idlecnt);
		1045	array_needsize (idles, idlemax, idlecnt, );
		1046	idles [idlecnt - 1] = w;
		1047	}
		1048
		1049	void
		1050	ev_idle_stop (struct ev_idle *w)
		1051	{
		1052	ev_clear_pending ((W)w);
		1053	if (ev_is_active (w))
		1054	return;
		1055
		1056	idles [w->active - 1] = idles [--idlecnt];
		1057	ev_stop ((W)w);
		1058	}
		1059
		1060	void
		1061	ev_prepare_start (struct ev_prepare *w)
		1062	{
		1063	if (ev_is_active (w))
		1064	return;
		1065
		1066	ev_start ((W)w, ++preparecnt);
		1067	array_needsize (prepares, preparemax, preparecnt, );
		1068	prepares [preparecnt - 1] = w;
		1069	}
		1070
		1071	void
		1072	ev_prepare_stop (struct ev_prepare *w)
		1073	{
		1074	ev_clear_pending ((W)w);
		1075	if (ev_is_active (w))
		1076	return;
		1077
		1078	prepares [w->active - 1] = prepares [--preparecnt];
		1079	ev_stop ((W)w);
		1080	}
		1081
		1082	void
		1083	ev_check_start (struct ev_check *w)
		1084	{
		1085	if (ev_is_active (w))
		1086	return;
		1087
		1088	ev_start ((W)w, ++checkcnt);
		1089	array_needsize (checks, checkmax, checkcnt, );
		1090	checks [checkcnt - 1] = w;
		1091	}
		1092
		1093	void
451	ev_stop ((struct ev_watcher *)w);	1094	ev_check_stop (struct ev_check *w)
452	}	1095	{
		1096	ev_clear_pending ((W)w);
		1097	if (ev_is_active (w))
		1098	return;
453		1099
		1100	checks [w->active - 1] = checks [--checkcnt];
		1101	ev_stop ((W)w);
		1102	}
		1103
		1104	void
		1105	ev_child_start (struct ev_child *w)
		1106	{
		1107	if (ev_is_active (w))
		1108	return;
		1109
		1110	ev_start ((W)w, 1);
		1111	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1112	}
		1113
		1114	void
		1115	ev_child_stop (struct ev_child *w)
		1116	{
		1117	ev_clear_pending ((W)w);
		1118	if (ev_is_active (w))
		1119	return;
		1120
		1121	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1122	ev_stop ((W)w);
		1123	}
		1124
454	/*****************************************************************************/	1125	/*****************************************************************************/
		1126
		1127	struct ev_once
		1128	{
		1129	struct ev_io io;
		1130	struct ev_timer to;
		1131	void (*cb)(int revents, void *arg);
		1132	void *arg;
		1133	};
		1134
		1135	static void
		1136	once_cb (struct ev_once *once, int revents)
		1137	{
		1138	void (*cb)(int revents, void *arg) = once->cb;
		1139	void *arg = once->arg;
		1140
		1141	ev_io_stop (&once->io);
		1142	ev_timer_stop (&once->to);
		1143	free (once);
		1144
		1145	cb (revents, arg);
		1146	}
		1147
		1148	static void
		1149	once_cb_io (struct ev_io *w, int revents)
		1150	{
		1151	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1152	}
		1153
		1154	static void
		1155	once_cb_to (struct ev_timer *w, int revents)
		1156	{
		1157	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1158	}
		1159
		1160	void
		1161	ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1162	{
		1163	struct ev_once *once = malloc (sizeof (struct ev_once));
		1164
		1165	if (!once)
		1166	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1167	else
		1168	{
		1169	once->cb = cb;
		1170	once->arg = arg;
		1171
		1172	ev_watcher_init (&once->io, once_cb_io);
		1173	if (fd >= 0)
		1174	{
		1175	ev_io_set (&once->io, fd, events);
		1176	ev_io_start (&once->io);
		1177	}
		1178
		1179	ev_watcher_init (&once->to, once_cb_to);
		1180	if (timeout >= 0.)
		1181	{
		1182	ev_timer_set (&once->to, timeout, 0.);
		1183	ev_timer_start (&once->to);
		1184	}
		1185	}
		1186	}
		1187
		1188	/*****************************************************************************/
		1189
455	#if 1	1190	#if 0
		1191
		1192	struct ev_io wio;
456		1193
457	static void	1194	static void
458	sin_cb (struct ev_io *w, int revents)	1195	sin_cb (struct ev_io *w, int revents)
459	{	1196	{
460	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1197	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
461	}	1198	}
462		1199
463	static void	1200	static void
464	ocb (struct ev_timer *w, int revents)	1201	ocb (struct ev_timer *w, int revents)
465	{	1202	{
466	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1203	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1204	ev_timer_stop (w);
		1205	ev_timer_start (w);
		1206	}
		1207
		1208	static void
		1209	scb (struct ev_signal *w, int revents)
		1210	{
		1211	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1212	ev_io_stop (&wio);
		1213	ev_io_start (&wio);
		1214	}
		1215
		1216	static void
		1217	gcb (struct ev_signal *w, int revents)
		1218	{
		1219	fprintf (stderr, "generic %x\n", revents);
		1220
467	}	1221	}
468		1222
469	int main (void)	1223	int main (void)
470	{	1224	{
471	struct ev_io sin;
472
473	ev_init (0);	1225	ev_init (0);
474		1226
475	evw_init (&sin, sin_cb, 55);
476	evio_set (&sin, 0, EV_READ);	1227	ev_io_init (&wio, sin_cb, 0, EV_READ);
477	evio_start (&sin);	1228	ev_io_start (&wio);
478		1229
479	struct ev_timer t[1000];	1230	struct ev_timer t[10000];
480		1231
		1232	#if 0
481	int i;	1233	int i;
482	for (i = 0; i < 1000; ++i)	1234	for (i = 0; i < 10000; ++i)
483	{	1235	{
484	struct ev_timer *w = t + i;	1236	struct ev_timer *w = t + i;
485	evw_init (w, ocb, i);	1237	ev_watcher_init (w, ocb, i);
486	evtimer_set_rel (w, drand48 (), 0);	1238	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
487	evtimer_start (w);	1239	ev_timer_start (w);
488	if (drand48 () < 0.5)	1240	if (drand48 () < 0.5)
489	evtimer_stop (w);	1241	ev_timer_stop (w);
490	}	1242	}
		1243	#endif
		1244
		1245	struct ev_timer t1;
		1246	ev_timer_init (&t1, ocb, 5, 10);
		1247	ev_timer_start (&t1);
		1248
		1249	struct ev_signal sig;
		1250	ev_signal_init (&sig, scb, SIGQUIT);
		1251	ev_signal_start (&sig);
		1252
		1253	struct ev_check cw;
		1254	ev_check_init (&cw, gcb);
		1255	ev_check_start (&cw);
		1256
		1257	struct ev_idle iw;
		1258	ev_idle_init (&iw, gcb);
		1259	ev_idle_start (&iw);
491		1260
492	ev_loop (0);	1261	ev_loop (0);
493		1262
494	return 0;	1263	return 0;
495	}	1264	}

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