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Comparing libev/ev.c (file contents):
Revision 1.1 by root, Tue Oct 30 20:59:31 2007 UTC vs.
Revision 1.46 by root, Sat Nov 3 09:20:12 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	#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_USE_POLL
		64	# define EV_USE_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
		118	static ev_tstamp now_floor, now, diff; /* monotonic clock */
30	ev_tstamp ev_now;	119	ev_tstamp ev_now;
31	int ev_method;	120	int ev_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)(int fd, int oev, int nev);
37	static void (*method_poll)(ev_tstamp timeout);	126	static void (*method_poll)(ev_tstamp timeout);
		127
		128	/*****************************************************************************/
38		129
39	ev_tstamp	130	ev_tstamp
40	ev_time (void)	131	ev_time (void)
41	{	132	{
42	#if HAVE_REALTIME	133	#if EV_USE_REALTIME
43	struct timespec ts;	134	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	135	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	136	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	137	#else
47	struct timeval tv;	138	struct timeval tv;
…		…
51	}	142	}
52		143
53	static ev_tstamp	144	static ev_tstamp
54	get_clock (void)	145	get_clock (void)
55	{	146	{
56	#if HAVE_MONOTONIC	147	#if EV_USE_MONOTONIC
57	if (have_monotonic)	148	if (expect_true (have_monotonic))
58	{	149	{
59	struct timespec ts;	150	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	151	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	152	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	153	}
63	#endif	154	#endif
64		155
65	return ev_time ();	156	return ev_time ();
66	}	157	}
67		158
		159	#define array_roundsize(base,n) ((n) | 4 & ~3)
		160
68	#define array_needsize(base,cur,cnt,init) \	161	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	162	if (expect_false ((cnt) > cur)) \
70	{ \	163	{ \
71	int newcnt = cur; \	164	int newcnt = cur; \
72	do \	165	do \
73	{ \	166	{ \
74	newcnt += (newcnt >> 1) + 16; \	167	newcnt = array_roundsize (base, newcnt << 1); \
75	} \	168	} \
76	while ((cnt) > newcnt); \	169	while ((cnt) > newcnt); \
77	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	170	\
78	base = realloc (base, sizeof (*base) * (newcnt)); \	171	base = realloc (base, sizeof (*base) * (newcnt)); \
79	init (base + cur, newcnt - cur); \	172	init (base + cur, newcnt - cur); \
80	cur = newcnt; \	173	cur = newcnt; \
81	}	174	}
82		175
		176	/*****************************************************************************/
		177
83	typedef struct	178	typedef struct
84	{	179	{
85	struct ev_io *head;	180	struct ev_io *head;
86	unsigned char wev, rev; /* want, received event set */	181	unsigned char events;
		182	unsigned char reify;
87	} ANFD;	183	} ANFD;
88		184
89	static ANFD *anfds;	185	static ANFD *anfds;
90	static int anfdmax;	186	static int anfdmax;
91		187
		188	static void
		189	anfds_init (ANFD *base, int count)
		190	{
		191	while (count--)
		192	{
		193	base->head = 0;
		194	base->events = EV_NONE;
		195	base->reify = 0;
		196
		197	++base;
		198	}
		199	}
		200
		201	typedef struct
		202	{
		203	W w;
		204	int events;
		205	} ANPENDING;
		206
		207	static ANPENDING *pendings [NUMPRI];
		208	static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
		209
		210	static void
		211	event (W w, int events)
		212	{
		213	if (w->pending)
		214	{
		215	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		216	return;
		217	}
		218
		219	w->pending = ++pendingcnt [ABSPRI (w)];
		220	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
		221	pendings [ABSPRI (w)][w->pending - 1].w = w;
		222	pendings [ABSPRI (w)][w->pending - 1].events = events;
		223	}
		224
		225	static void
		226	queue_events (W *events, int eventcnt, int type)
		227	{
		228	int i;
		229
		230	for (i = 0; i < eventcnt; ++i)
		231	event (events [i], type);
		232	}
		233
		234	static void
		235	fd_event (int fd, int events)
		236	{
		237	ANFD *anfd = anfds + fd;
		238	struct ev_io *w;
		239
		240	for (w = anfd->head; w; w = w->next)
		241	{
		242	int ev = w->events & events;
		243
		244	if (ev)
		245	event ((W)w, ev);
		246	}
		247	}
		248
		249	/*****************************************************************************/
		250
92	static int *fdchanges;	251	static int *fdchanges;
93	static int fdchangemax, fdchangecnt;	252	static int fdchangemax, fdchangecnt;
94		253
95	static void	254	static void
96	anfds_init (ANFD *base, int count)	255	fd_reify (void)
97	{	256	{
98	while (count--)	257	int i;
99	{	258
100	base->head = 0;	259	for (i = 0; i < fdchangecnt; ++i)
101	base->wev = base->rev = EV_NONE;
102	++base;
103	}	260	{
104	}	261	int fd = fdchanges [i];
105
106	typedef struct
107	{
108	struct ev_watcher *w;
109	int events;
110	} ANPENDING;
111
112	static ANPENDING *pendings;
113	static int pendingmax, pendingcnt;
114
115	static void
116	event (struct ev_watcher *w, int events)
117	{
118	w->pending = ++pendingcnt;
119	array_needsize (pendings, pendingmax, pendingcnt, );
120	pendings [pendingcnt - 1].w = w;
121	pendings [pendingcnt - 1].events = events;
122	}
123
124	static void
125	fd_event (int fd, int events)
126	{
127	ANFD *anfd = anfds + fd;	262	ANFD *anfd = anfds + fd;
		263	struct ev_io *w;
		264
		265	int events = 0;
		266
		267	for (w = anfd->head; w; w = w->next)
		268	events |= w->events;
		269
		270	anfd->reify = 0;
		271
		272	if (anfd->events != events)
		273	{
		274	method_modify (fd, anfd->events, events);
		275	anfd->events = events;
		276	}
		277	}
		278
		279	fdchangecnt = 0;
		280	}
		281
		282	static void
		283	fd_change (int fd)
		284	{
		285	if (anfds [fd].reify || fdchangecnt < 0)
		286	return;
		287
		288	anfds [fd].reify = 1;
		289
		290	++fdchangecnt;
		291	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		292	fdchanges [fdchangecnt - 1] = fd;
		293	}
		294
		295	static void
		296	fd_kill (int fd)
		297	{
128	struct ev_io *w;	298	struct ev_io *w;
129		299
130	for (w = anfd->head; w; w = w->next)	300	printf ("killing fd %d\n", fd);//D
		301	while ((w = anfds [fd].head))
		302	{
		303	ev_io_stop (w);
		304	event ((W)w, EV_ERROR | EV_READ | EV_WRITE);
		305	}
		306	}
		307
		308	/* called on EBADF to verify fds */
		309	static void
		310	fd_ebadf (void)
		311	{
		312	int fd;
		313
		314	for (fd = 0; fd < anfdmax; ++fd)
		315	if (anfds [fd].events)
		316	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		317	fd_kill (fd);
		318	}
		319
		320	/* called on ENOMEM in select/poll to kill some fds and retry */
		321	static void
		322	fd_enomem (void)
		323	{
		324	int fd = anfdmax;
		325
		326	while (fd--)
		327	if (anfds [fd].events)
131	{	328	{
132	int ev = w->events & events;	329	close (fd);
133		330	fd_kill (fd);
134	if (ev)	331	return;
135	event ((struct ev_watcher *)w, ev);
136	}	332	}
137	}	333	}
		334
		335	/*****************************************************************************/
138		336
139	static struct ev_timer **timers;	337	static struct ev_timer **timers;
140	static int timermax, timercnt;	338	static int timermax, timercnt;
141		339
		340	static struct ev_periodic **periodics;
		341	static int periodicmax, periodiccnt;
		342
142	static void	343	static void
143	upheap (int k)	344	upheap (WT *timers, int k)
144	{	345	{
145	struct ev_timer *w = timers [k];	346	WT w = timers [k];
146		347
147	while (k && timers [k >> 1]->at > w->at)	348	while (k && timers [k >> 1]->at > w->at)
148	{	349	{
149	timers [k] = timers [k >> 1];	350	timers [k] = timers [k >> 1];
150	timers [k]->active = k + 1;	351	timers [k]->active = k + 1;
…		…
155	timers [k]->active = k + 1;	356	timers [k]->active = k + 1;
156		357
157	}	358	}
158		359
159	static void	360	static void
160	downheap (int k)	361	downheap (WT *timers, int N, int k)
161	{	362	{
162	struct ev_timer *w = timers [k];	363	WT w = timers [k];
163		364
164	while (k <= (timercnt >> 1))	365	while (k < (N >> 1))
165	{	366	{
166	int j = k << 1;	367	int j = k << 1;
167		368
168	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	369	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
169	++j;	370	++j;
170		371
171	if (w->at <= timers [j]->at)	372	if (w->at <= timers [j]->at)
172	break;	373	break;
173		374
174	timers [k] = timers [j];	375	timers [k] = timers [j];
175	timers [k]->active = k;	376	timers [k]->active = k + 1;
176	k = j;	377	k = j;
177	}	378	}
178		379
179	timers [k] = w;	380	timers [k] = w;
180	timers [k]->active = k + 1;	381	timers [k]->active = k + 1;
181	}	382	}
182		383
183	static struct ev_signal **signals;	384	/*****************************************************************************/
		385
		386	typedef struct
		387	{
		388	struct ev_signal *head;
		389	sig_atomic_t volatile gotsig;
		390	} ANSIG;
		391
		392	static ANSIG *signals;
184	static int signalmax, signalcnt;	393	static int signalmax;
185		394
		395	static int sigpipe [2];
		396	static sig_atomic_t volatile gotsig;
		397	static struct ev_io sigev;
		398
186	static void	399	static void
187	signals_init (struct ev_signal **base, int count)	400	signals_init (ANSIG *base, int count)
188	{	401	{
189	while (count--)	402	while (count--)
190	*base++ = 0;	403	{
191	}	404	base->head = 0;
		405	base->gotsig = 0;
192		406
		407	++base;
		408	}
		409	}
		410
		411	static void
		412	sighandler (int signum)
		413	{
		414	signals [signum - 1].gotsig = 1;
		415
		416	if (!gotsig)
		417	{
		418	gotsig = 1;
		419	write (sigpipe [1], &signum, 1);
		420	}
		421	}
		422
		423	static void
		424	sigcb (struct ev_io *iow, int revents)
		425	{
		426	struct ev_signal *w;
		427	int signum;
		428
		429	read (sigpipe [0], &revents, 1);
		430	gotsig = 0;
		431
		432	for (signum = signalmax; signum--; )
		433	if (signals [signum].gotsig)
		434	{
		435	signals [signum].gotsig = 0;
		436
		437	for (w = signals [signum].head; w; w = w->next)
		438	event ((W)w, EV_SIGNAL);
		439	}
		440	}
		441
		442	static void
		443	siginit (void)
		444	{
		445	#ifndef WIN32
		446	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		447	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		448
		449	/* rather than sort out wether we really need nb, set it */
		450	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		451	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		452	#endif
		453
		454	ev_io_set (&sigev, sigpipe [0], EV_READ);
		455	ev_io_start (&sigev);
		456	}
		457
		458	/*****************************************************************************/
		459
		460	static struct ev_idle **idles;
		461	static int idlemax, idlecnt;
		462
		463	static struct ev_prepare **prepares;
		464	static int preparemax, preparecnt;
		465
		466	static struct ev_check **checks;
		467	static int checkmax, checkcnt;
		468
		469	/*****************************************************************************/
		470
		471	static struct ev_child *childs [PID_HASHSIZE];
		472	static struct ev_signal childev;
		473
		474	#ifndef WIN32
		475
		476	#ifndef WCONTINUED
		477	# define WCONTINUED 0
		478	#endif
		479
		480	static void
		481	childcb (struct ev_signal *sw, int revents)
		482	{
		483	struct ev_child *w;
		484	int pid, status;
		485
		486	while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)
		487	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		488	if (w->pid == pid || !w->pid)
		489	{
		490	w->rpid = pid;
		491	w->rstatus = status;
		492	event ((W)w, EV_CHILD);
		493	}
		494	}
		495
		496	#endif
		497
		498	/*****************************************************************************/
		499
		500	#if EV_USE_KQUEUE
		501	# include "ev_kqueue.c"
		502	#endif
193	#if HAVE_EPOLL	503	#if EV_USE_EPOLL
194	# include "ev_epoll.c"	504	# include "ev_epoll.c"
195	#endif	505	#endif
		506	#if EV_USE_POLL
		507	# include "ev_poll.c"
		508	#endif
196	#if HAVE_SELECT	509	#if EV_USE_SELECT
197	# include "ev_select.c"	510	# include "ev_select.c"
198	#endif	511	#endif
199		512
		513	int
		514	ev_version_major (void)
		515	{
		516	return EV_VERSION_MAJOR;
		517	}
		518
		519	int
		520	ev_version_minor (void)
		521	{
		522	return EV_VERSION_MINOR;
		523	}
		524
		525	/* return true if we are running with elevated privileges and ignore env variables */
		526	static int
		527	enable_secure ()
		528	{
		529	return getuid () != geteuid ()
		530	|| getgid () != getegid ();
		531	}
		532
200	int ev_init (int flags)	533	int ev_init (int methods)
201	{	534	{
		535	if (!ev_method)
		536	{
202	#if HAVE_MONOTONIC	537	#if EV_USE_MONOTONIC
203	{	538	{
204	struct timespec ts;	539	struct timespec ts;
205	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	540	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
206	have_monotonic = 1;	541	have_monotonic = 1;
207	}	542	}
208	#endif	543	#endif
209		544
210	ev_now = ev_time ();	545	ev_now = ev_time ();
		546	now = get_clock ();
		547	now_floor = now;
		548	diff = ev_now - now;
211		549
		550	if (pipe (sigpipe))
		551	return 0;
		552
		553	if (methods == EVMETHOD_AUTO)
		554	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		555	methods = atoi (getenv ("LIBEV_METHODS"));
		556	else
		557	methods = EVMETHOD_ANY;
		558
		559	ev_method = 0;
		560	#if EV_USE_KQUEUE
		561	if (!ev_method && (methods & EVMETHOD_KQUEUE)) kqueue_init (methods);
		562	#endif
212	#if HAVE_EPOLL	563	#if EV_USE_EPOLL
213	if (epoll_init (flags))	564	if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods);
214	return ev_method;
215	#endif	565	#endif
		566	#if EV_USE_POLL
		567	if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
		568	#endif
216	#if HAVE_SELECT	569	#if EV_USE_SELECT
217	if (select_init (flags))	570	if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
218	return ev_method;
219	#endif	571	#endif
220		572
221	ev_method = EVMETHOD_NONE;	573	if (ev_method)
		574	{
		575	ev_watcher_init (&sigev, sigcb);
		576	siginit ();
		577
		578	#ifndef WIN32
		579	ev_signal_init (&childev, childcb, SIGCHLD);
		580	ev_signal_start (&childev);
		581	#endif
		582	}
		583	}
		584
222	return ev_method;	585	return ev_method;
223	}	586	}
224		587
225	void ev_prefork (void)	588	/*****************************************************************************/
226	{
227	}
228		589
		590	void
		591	ev_fork_prepare (void)
		592	{
		593	/* nop */
		594	}
		595
		596	void
229	void ev_postfork_parent (void)	597	ev_fork_parent (void)
230	{	598	{
		599	/* nop */
231	}	600	}
232		601
		602	void
233	void ev_postfork_child (void)	603	ev_fork_child (void)
234	{	604	{
235	#if HAVE_EPOLL	605	#if EV_USE_EPOLL
		606	if (ev_method == EVMETHOD_EPOLL)
236	epoll_postfork_child ();	607	epoll_postfork_child ();
237	#endif	608	#endif
238	}
239		609
		610	ev_io_stop (&sigev);
		611	close (sigpipe [0]);
		612	close (sigpipe [1]);
		613	pipe (sigpipe);
		614	siginit ();
		615	}
		616
		617	/*****************************************************************************/
		618
240	static void	619	static void
241	call_pending ()	620	call_pending (void)
		621	{
		622	int pri;
		623
		624	for (pri = NUMPRI; pri--; )
		625	while (pendingcnt [pri])
		626	{
		627	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		628
		629	if (p->w)
		630	{
		631	p->w->pending = 0;
		632	p->w->cb (p->w, p->events);
		633	}
		634	}
		635	}
		636
		637	static void
		638	timers_reify (void)
		639	{
		640	while (timercnt && timers [0]->at <= now)
		641	{
		642	struct ev_timer *w = timers [0];
		643
		644	/* first reschedule or stop timer */
		645	if (w->repeat)
		646	{
		647	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
		648	w->at = now + w->repeat;
		649	downheap ((WT *)timers, timercnt, 0);
		650	}
		651	else
		652	ev_timer_stop (w); /* nonrepeating: stop timer */
		653
		654	event ((W)w, EV_TIMEOUT);
		655	}
		656	}
		657
		658	static void
		659	periodics_reify (void)
		660	{
		661	while (periodiccnt && periodics [0]->at <= ev_now)
		662	{
		663	struct ev_periodic *w = periodics [0];
		664
		665	/* first reschedule or stop timer */
		666	if (w->interval)
		667	{
		668	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		669	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
		670	downheap ((WT *)periodics, periodiccnt, 0);
		671	}
		672	else
		673	ev_periodic_stop (w); /* nonrepeating: stop timer */
		674
		675	event ((W)w, EV_PERIODIC);
		676	}
		677	}
		678
		679	static void
		680	periodics_reschedule (ev_tstamp diff)
242	{	681	{
243	int i;	682	int i;
244		683
		684	/* adjust periodics after time jump */
245	for (i = 0; i < pendingcnt; ++i)	685	for (i = 0; i < periodiccnt; ++i)
246	{	686	{
247	ANPENDING *p = pendings + i;	687	struct ev_periodic *w = periodics [i];
248		688
249	if (p->w)	689	if (w->interval)
250	{
251	p->w->pending = 0;
252	p->w->cb (p->w, p->events);
253	}	690	{
254	}	691	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
255		692
256	pendingcnt = 0;	693	if (fabs (diff) >= 1e-4)
257	}	694	{
		695	ev_periodic_stop (w);
		696	ev_periodic_start (w);
258		697
259	static void	698	i = 0; /* restart loop, inefficient, but time jumps should be rare */
260	timer_reify (void)	699	}
261	{
262	while (timercnt && timers [0]->at <= ev_now)
263	{
264	struct ev_timer *w = timers [0];
265
266	/* first reschedule timer */
267	if (w->repeat)
268	{	700	}
269	fprintf (stderr, "a %f now %f repeat %f, %f\n", w->at, ev_now, w->repeat, w->repeat *1e30);//D	701	}
270	if (w->is_abs)	702	}
271	w->at += floor ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
272	else
273	w->at = ev_now + w->repeat;
274		703
275	fprintf (stderr, "b %f\n", w->at);//D	704	static int
		705	time_update_monotonic (void)
		706	{
		707	now = get_clock ();
276		708
277	downheap (0);	709	if (expect_true (now - now_floor < MIN_TIMEJUMP * .5))
		710	{
		711	ev_now = now + diff;
		712	return 0;
		713	}
		714	else
		715	{
		716	now_floor = now;
		717	ev_now = ev_time ();
		718	return 1;
		719	}
		720	}
		721
		722	static void
		723	time_update (void)
		724	{
		725	int i;
		726
		727	#if EV_USE_MONOTONIC
		728	if (expect_true (have_monotonic))
		729	{
		730	if (time_update_monotonic ())
278	}	731	{
		732	ev_tstamp odiff = diff;
		733
		734	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		735	{
		736	diff = ev_now - now;
		737
		738	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		739	return; /* all is well */
		740
		741	ev_now = ev_time ();
		742	now = get_clock ();
		743	now_floor = now;
		744	}
		745
		746	periodics_reschedule (diff - odiff);
		747	/* no timer adjustment, as the monotonic clock doesn't jump */
		748	}
		749	}
		750	else
		751	#endif
		752	{
		753	ev_now = ev_time ();
		754
		755	if (expect_false (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		756	{
		757	periodics_reschedule (ev_now - now);
		758
		759	/* adjust timers. this is easy, as the offset is the same for all */
		760	for (i = 0; i < timercnt; ++i)
		761	timers [i]->at += diff;
		762	}
		763
		764	now = ev_now;
		765	}
		766	}
		767
		768	int ev_loop_done;
		769
		770	void ev_loop (int flags)
		771	{
		772	double block;
		773	ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
		774
		775	do
		776	{
		777	/* queue check watchers (and execute them) */
		778	if (expect_false (preparecnt))
		779	{
		780	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		781	call_pending ();
		782	}
		783
		784	/* update fd-related kernel structures */
		785	fd_reify ();
		786
		787	/* calculate blocking time */
		788
		789	/* we only need this for !monotonic clockor timers, but as we basically
		790	always have timers, we just calculate it always */
		791	#if EV_USE_MONOTONIC
		792	if (expect_true (have_monotonic))
		793	time_update_monotonic ();
279	else	794	else
280	evtimer_stop (w); /* nonrepeating: stop timer */	795	#endif
281		796	{
282	event ((struct ev_watcher *)w, EV_TIMEOUT);
283	}
284	}
285
286	int ev_loop_done;
287
288	int ev_loop (int flags)
289	{
290	double block;
291	ev_loop_done = flags & EVLOOP_ONESHOT;
292
293	do
294	{
295	/* update fd-related kernel structures */
296	method_reify (); fdchangecnt = 0;
297
298	/* calculate blocking time */
299	ev_now = ev_time ();	797	ev_now = ev_time ();
		798	now = ev_now;
		799	}
300		800
301	if (flags & EVLOOP_NONBLOCK)	801	if (flags & EVLOOP_NONBLOCK || idlecnt)
302	block = 0.;	802	block = 0.;
303	else if (!timercnt)
304	block = MAX_BLOCKTIME;
305	else	803	else
306	{	804	{
		805	block = MAX_BLOCKTIME;
		806
		807	if (timercnt)
		808	{
307	block = timers [0]->at - ev_now + method_fudge;	809	ev_tstamp to = timers [0]->at - now + method_fudge;
		810	if (block > to) block = to;
		811	}
		812
		813	if (periodiccnt)
		814	{
		815	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
		816	if (block > to) block = to;
		817	}
		818
308	if (block < 0.) block = 0.;	819	if (block < 0.) block = 0.;
309	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
310	}	820	}
311		821
312	fprintf (stderr, "block %f\n", block);//D
313	method_poll (block);	822	method_poll (block);
314		823
		824	/* update ev_now, do magic */
		825	time_update ();
		826
315	/* put pending timers into pendign queue and reschedule them */	827	/* queue pending timers and reschedule them */
316	timer_reify ();	828	timers_reify (); /* relative timers called last */
		829	periodics_reify (); /* absolute timers called first */
317		830
318	ev_now = ev_time ();	831	/* queue idle watchers unless io or timers are pending */
		832	if (!pendingcnt)
		833	queue_events ((W *)idles, idlecnt, EV_IDLE);
		834
		835	/* queue check watchers, to be executed first */
		836	if (checkcnt)
		837	queue_events ((W *)checks, checkcnt, EV_CHECK);
		838
319	call_pending ();	839	call_pending ();
320	}	840	}
321	while (!ev_loop_done);	841	while (!ev_loop_done);
322	}
323		842
		843	if (ev_loop_done != 2)
		844	ev_loop_done = 0;
		845	}
		846
		847	/*****************************************************************************/
		848
324	static void	849	static void
325	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	850	wlist_add (WL *head, WL elem)
326	{	851	{
327	elem->next = *head;	852	elem->next = *head;
328	*head = elem;	853	*head = elem;
329	}	854	}
330		855
331	static void	856	static void
332	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	857	wlist_del (WL *head, WL elem)
333	{	858	{
334	while (*head)	859	while (*head)
335	{	860	{
336	if (*head == elem)	861	if (*head == elem)
337	{	862	{
…		…
342	head = &(*head)->next;	867	head = &(*head)->next;
343	}	868	}
344	}	869	}
345		870
346	static void	871	static void
347	ev_start (struct ev_watcher *w, int active)	872	ev_clear_pending (W w)
348	{	873	{
		874	if (w->pending)
		875	{
		876	pendings [ABSPRI (w)][w->pending - 1].w = 0;
349	w->pending = 0;	877	w->pending = 0;
		878	}
		879	}
		880
		881	static void
		882	ev_start (W w, int active)
		883	{
		884	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		885	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		886
350	w->active = active;	887	w->active = active;
351	}	888	}
352		889
353	static void	890	static void
354	ev_stop (struct ev_watcher *w)	891	ev_stop (W w)
355	{	892	{
356	if (w->pending)
357	pendings [w->pending - 1].w = 0;
358
359	w->active = 0;	893	w->active = 0;
360	/* nop */
361	}	894	}
362		895
		896	/*****************************************************************************/
		897
363	void	898	void
364	evio_start (struct ev_io *w)	899	ev_io_start (struct ev_io *w)
365	{	900	{
		901	int fd = w->fd;
		902
366	if (ev_is_active (w))	903	if (ev_is_active (w))
367	return;	904	return;
368		905
369	int fd = w->fd;	906	assert (("ev_io_start called with negative fd", fd >= 0));
370		907
371	ev_start ((struct ev_watcher *)w, 1);	908	ev_start ((W)w, 1);
372	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	909	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
373	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	910	wlist_add ((WL *)&anfds[fd].head, (WL)w);
374		911
375	++fdchangecnt;	912	fd_change (fd);
376	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
377	fdchanges [fdchangecnt - 1] = fd;
378	}	913	}
379		914
380	void	915	void
381	evio_stop (struct ev_io *w)	916	ev_io_stop (struct ev_io *w)
382	{	917	{
		918	ev_clear_pending ((W)w);
383	if (!ev_is_active (w))	919	if (!ev_is_active (w))
384	return;	920	return;
385		921
386	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	922	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
387	ev_stop ((struct ev_watcher *)w);	923	ev_stop ((W)w);
388		924
389	++fdchangecnt;	925	fd_change (w->fd);
390	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
391	fdchanges [fdchangecnt - 1] = w->fd;
392	}	926	}
393		927
394	void	928	void
395	evtimer_start (struct ev_timer *w)	929	ev_timer_start (struct ev_timer *w)
396	{	930	{
397	if (ev_is_active (w))	931	if (ev_is_active (w))
398	return;	932	return;
399		933
400	fprintf (stderr, "t1 %f a %d\n", w->at, w->is_abs);//D
401	if (w->is_abs)
402	{
403	if (w->repeat)
404	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
405	}
406	else
407	w->at += ev_now;	934	w->at += now;
408	fprintf (stderr, "t2 %f a %d\n", w->at, w->is_abs);//D
409		935
410	ev_start ((struct ev_watcher *)w, ++timercnt);	936	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		937
		938	ev_start ((W)w, ++timercnt);
411	array_needsize (timers, timermax, timercnt, );	939	array_needsize (timers, timermax, timercnt, );
412	timers [timercnt - 1] = w;	940	timers [timercnt - 1] = w;
413	upheap (timercnt - 1);	941	upheap ((WT *)timers, timercnt - 1);
414	}	942	}
415		943
416	void	944	void
417	evtimer_stop (struct ev_timer *w)	945	ev_timer_stop (struct ev_timer *w)
418	{	946	{
		947	ev_clear_pending ((W)w);
419	if (!ev_is_active (w))	948	if (!ev_is_active (w))
420	return;	949	return;
421		950
		951	if (w->active < timercnt--)
		952	{
422	timers [w->active - 1] = timers [--timercnt];	953	timers [w->active - 1] = timers [timercnt];
423	downheap (w->active - 1);	954	downheap ((WT *)timers, timercnt, w->active - 1);
424	ev_stop ((struct ev_watcher *)w);	955	}
425	}
426		956
		957	w->at = w->repeat;
		958
		959	ev_stop ((W)w);
		960	}
		961
427	void	962	void
428	evsignal_start (struct ev_signal *w)	963	ev_timer_again (struct ev_timer *w)
429	{	964	{
430	if (ev_is_active (w))	965	if (ev_is_active (w))
431	return;	966	{
		967	if (w->repeat)
		968	{
		969	w->at = now + w->repeat;
		970	downheap ((WT *)timers, timercnt, w->active - 1);
		971	}
		972	else
		973	ev_timer_stop (w);
		974	}
		975	else if (w->repeat)
		976	ev_timer_start (w);
		977	}
432		978
433	ev_start ((struct ev_watcher *)w, 1);	979	void
		980	ev_periodic_start (struct ev_periodic *w)
		981	{
		982	if (ev_is_active (w))
		983	return;
		984
		985	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		986
		987	/* this formula differs from the one in periodic_reify because we do not always round up */
		988	if (w->interval)
		989	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		990
		991	ev_start ((W)w, ++periodiccnt);
		992	array_needsize (periodics, periodicmax, periodiccnt, );
		993	periodics [periodiccnt - 1] = w;
		994	upheap ((WT *)periodics, periodiccnt - 1);
		995	}
		996
		997	void
		998	ev_periodic_stop (struct ev_periodic *w)
		999	{
		1000	ev_clear_pending ((W)w);
		1001	if (!ev_is_active (w))
		1002	return;
		1003
		1004	if (w->active < periodiccnt--)
		1005	{
		1006	periodics [w->active - 1] = periodics [periodiccnt];
		1007	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		1008	}
		1009
		1010	ev_stop ((W)w);
		1011	}
		1012
		1013	void
		1014	ev_signal_start (struct ev_signal *w)
		1015	{
		1016	if (ev_is_active (w))
		1017	return;
		1018
		1019	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1020
		1021	ev_start ((W)w, 1);
434	array_needsize (signals, signalmax, w->signum, signals_init);	1022	array_needsize (signals, signalmax, w->signum, signals_init);
435	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1023	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
436	}
437		1024
		1025	if (!w->next)
		1026	{
		1027	struct sigaction sa;
		1028	sa.sa_handler = sighandler;
		1029	sigfillset (&sa.sa_mask);
		1030	sa.sa_flags = 0;
		1031	sigaction (w->signum, &sa, 0);
		1032	}
		1033	}
		1034
438	void	1035	void
439	evsignal_stop (struct ev_signal *w)	1036	ev_signal_stop (struct ev_signal *w)
440	{	1037	{
		1038	ev_clear_pending ((W)w);
441	if (!ev_is_active (w))	1039	if (!ev_is_active (w))
442	return;	1040	return;
443		1041
444	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1042	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1043	ev_stop ((W)w);
		1044
		1045	if (!signals [w->signum - 1].head)
		1046	signal (w->signum, SIG_DFL);
		1047	}
		1048
		1049	void
		1050	ev_idle_start (struct ev_idle *w)
		1051	{
		1052	if (ev_is_active (w))
		1053	return;
		1054
		1055	ev_start ((W)w, ++idlecnt);
		1056	array_needsize (idles, idlemax, idlecnt, );
		1057	idles [idlecnt - 1] = w;
		1058	}
		1059
		1060	void
		1061	ev_idle_stop (struct ev_idle *w)
		1062	{
		1063	ev_clear_pending ((W)w);
		1064	if (ev_is_active (w))
		1065	return;
		1066
		1067	idles [w->active - 1] = idles [--idlecnt];
		1068	ev_stop ((W)w);
		1069	}
		1070
		1071	void
		1072	ev_prepare_start (struct ev_prepare *w)
		1073	{
		1074	if (ev_is_active (w))
		1075	return;
		1076
		1077	ev_start ((W)w, ++preparecnt);
		1078	array_needsize (prepares, preparemax, preparecnt, );
		1079	prepares [preparecnt - 1] = w;
		1080	}
		1081
		1082	void
		1083	ev_prepare_stop (struct ev_prepare *w)
		1084	{
		1085	ev_clear_pending ((W)w);
		1086	if (ev_is_active (w))
		1087	return;
		1088
		1089	prepares [w->active - 1] = prepares [--preparecnt];
		1090	ev_stop ((W)w);
		1091	}
		1092
		1093	void
		1094	ev_check_start (struct ev_check *w)
		1095	{
		1096	if (ev_is_active (w))
		1097	return;
		1098
		1099	ev_start ((W)w, ++checkcnt);
		1100	array_needsize (checks, checkmax, checkcnt, );
		1101	checks [checkcnt - 1] = w;
		1102	}
		1103
		1104	void
445	ev_stop ((struct ev_watcher *)w);	1105	ev_check_stop (struct ev_check *w)
446	}	1106	{
		1107	ev_clear_pending ((W)w);
		1108	if (ev_is_active (w))
		1109	return;
447		1110
		1111	checks [w->active - 1] = checks [--checkcnt];
		1112	ev_stop ((W)w);
		1113	}
		1114
		1115	void
		1116	ev_child_start (struct ev_child *w)
		1117	{
		1118	if (ev_is_active (w))
		1119	return;
		1120
		1121	ev_start ((W)w, 1);
		1122	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1123	}
		1124
		1125	void
		1126	ev_child_stop (struct ev_child *w)
		1127	{
		1128	ev_clear_pending ((W)w);
		1129	if (ev_is_active (w))
		1130	return;
		1131
		1132	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1133	ev_stop ((W)w);
		1134	}
		1135
448	/*****************************************************************************/	1136	/*****************************************************************************/
		1137
		1138	struct ev_once
		1139	{
		1140	struct ev_io io;
		1141	struct ev_timer to;
		1142	void (*cb)(int revents, void *arg);
		1143	void *arg;
		1144	};
		1145
		1146	static void
		1147	once_cb (struct ev_once *once, int revents)
		1148	{
		1149	void (*cb)(int revents, void *arg) = once->cb;
		1150	void *arg = once->arg;
		1151
		1152	ev_io_stop (&once->io);
		1153	ev_timer_stop (&once->to);
		1154	free (once);
		1155
		1156	cb (revents, arg);
		1157	}
		1158
		1159	static void
		1160	once_cb_io (struct ev_io *w, int revents)
		1161	{
		1162	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1163	}
		1164
		1165	static void
		1166	once_cb_to (struct ev_timer *w, int revents)
		1167	{
		1168	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1169	}
		1170
		1171	void
		1172	ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1173	{
		1174	struct ev_once *once = malloc (sizeof (struct ev_once));
		1175
		1176	if (!once)
		1177	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1178	else
		1179	{
		1180	once->cb = cb;
		1181	once->arg = arg;
		1182
		1183	ev_watcher_init (&once->io, once_cb_io);
		1184	if (fd >= 0)
		1185	{
		1186	ev_io_set (&once->io, fd, events);
		1187	ev_io_start (&once->io);
		1188	}
		1189
		1190	ev_watcher_init (&once->to, once_cb_to);
		1191	if (timeout >= 0.)
		1192	{
		1193	ev_timer_set (&once->to, timeout, 0.);
		1194	ev_timer_start (&once->to);
		1195	}
		1196	}
		1197	}
		1198
		1199	/*****************************************************************************/
		1200
449	#if 1	1201	#if 0
		1202
		1203	struct ev_io wio;
450		1204
451	static void	1205	static void
452	sin_cb (struct ev_io *w, int revents)	1206	sin_cb (struct ev_io *w, int revents)
453	{	1207	{
454	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1208	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
455	}	1209	}
456		1210
457	static void	1211	static void
458	ocb (struct ev_timer *w, int revents)	1212	ocb (struct ev_timer *w, int revents)
459	{	1213	{
460	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1214	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1215	ev_timer_stop (w);
		1216	ev_timer_start (w);
		1217	}
		1218
		1219	static void
		1220	scb (struct ev_signal *w, int revents)
		1221	{
		1222	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1223	ev_io_stop (&wio);
		1224	ev_io_start (&wio);
		1225	}
		1226
		1227	static void
		1228	gcb (struct ev_signal *w, int revents)
		1229	{
		1230	fprintf (stderr, "generic %x\n", revents);
		1231
461	}	1232	}
462		1233
463	int main (void)	1234	int main (void)
464	{	1235	{
465	struct ev_io sin;
466
467	ev_init (0);	1236	ev_init (0);
468		1237
469	evw_init (&sin, sin_cb, 55);
470	evio_set (&sin, 0, EV_READ);	1238	ev_io_init (&wio, sin_cb, 0, EV_READ);
471	evio_start (&sin);	1239	ev_io_start (&wio);
		1240
		1241	struct ev_timer t[10000];
		1242
		1243	#if 0
		1244	int i;
		1245	for (i = 0; i < 10000; ++i)
		1246	{
		1247	struct ev_timer *w = t + i;
		1248	ev_watcher_init (w, ocb, i);
		1249	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
		1250	ev_timer_start (w);
		1251	if (drand48 () < 0.5)
		1252	ev_timer_stop (w);
		1253	}
		1254	#endif
472		1255
473	struct ev_timer t1;	1256	struct ev_timer t1;
474	evw_init (&t1, ocb, 1);	1257	ev_timer_init (&t1, ocb, 5, 10);
475	evtimer_set_rel (&t1, 1, 0);
476	evtimer_start (&t1);	1258	ev_timer_start (&t1);
477		1259
478	struct ev_timer t2;	1260	struct ev_signal sig;
479	evw_init (&t2, ocb, 2);	1261	ev_signal_init (&sig, scb, SIGQUIT);
480	evtimer_set_abs (&t2, ev_time () + 2, 0);	1262	ev_signal_start (&sig);
		1263
		1264	struct ev_check cw;
		1265	ev_check_init (&cw, gcb);
		1266	ev_check_start (&cw);
		1267
		1268	struct ev_idle iw;
		1269	ev_idle_init (&iw, gcb);
481	evtimer_start (&t2);	1270	ev_idle_start (&iw);
482		1271
483	ev_loop (0);	1272	ev_loop (0);
484		1273
485	return 0;	1274	return 0;
486	}	1275	}

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