[ViewVC] Diff of: cvs/libev/ev.c

Comparing libev/ev.c (file contents):
Revision 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs.
Revision 1.41 by root, Fri Nov 2 16:54:34 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_REALTIME
		70	# define EV_USE_REALTIME 1
		71	#endif
		72
		73	/**/
		74
10	#ifdef CLOCK_MONOTONIC	75	#ifndef CLOCK_MONOTONIC
		76	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	77	# define EV_USE_MONOTONIC 0
12	#endif	78	#endif
13		79
14	#define HAVE_EPOLL 1	80	#ifndef CLOCK_REALTIME
		81	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	82	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	83	#endif
17		84
18	#define MAX_BLOCKTIME 60.	85	/**/
		86
		87	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		88	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		89	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		90	/#define CLEANUP_INTERVAL 300. / how often to try to free memory and re-check fds */
19		91
20	#include "ev.h"	92	#include "ev.h"
21		93
		94	#if __GNUC__ >= 3
		95	# define expect(expr,value) __builtin_expect ((expr),(value))
		96	# define inline inline
		97	#else
		98	# define expect(expr,value) (expr)
		99	# define inline static
		100	#endif
		101
		102	#define expect_false(expr) expect ((expr) != 0, 0)
		103	#define expect_true(expr) expect ((expr) != 0, 1)
		104
22	struct ev_watcher {	105	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	106	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	107	typedef struct ev_watcher_time *WT;
28	};
29		108
		109	static ev_tstamp now_floor, now, diff; /* monotonic clock */
30	ev_tstamp ev_now;	110	ev_tstamp ev_now;
31	int ev_method;	111	int ev_method;
32		112
33	static int have_monotonic; /* runtime */	113	static int have_monotonic; /* runtime */
34		114
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	115	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
36	static void (*method_reify)(void);	116	static void (*method_modify)(int fd, int oev, int nev);
37	static void (*method_poll)(ev_tstamp timeout);	117	static void (*method_poll)(ev_tstamp timeout);
		118
		119	/*****************************************************************************/
38		120
39	ev_tstamp	121	ev_tstamp
40	ev_time (void)	122	ev_time (void)
41	{	123	{
42	#if HAVE_REALTIME	124	#if EV_USE_REALTIME
43	struct timespec ts;	125	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	126	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	127	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	128	#else
47	struct timeval tv;	129	struct timeval tv;
51	}	133	}
52		134
53	static ev_tstamp	135	static ev_tstamp
54	get_clock (void)	136	get_clock (void)
55	{	137	{
56	#if HAVE_MONOTONIC	138	#if EV_USE_MONOTONIC
57	if (have_monotonic)	139	if (expect_true (have_monotonic))
58	{	140	{
59	struct timespec ts;	141	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	142	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	143	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	144	}
63	#endif	145	#endif
64		146
65	return ev_time ();	147	return ev_time ();
66	}	148	}
67		149
		150	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		151
68	#define array_needsize(base,cur,cnt,init) \	152	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	153	if (expect_false ((cnt) > cur)) \
70	{ \	154	{ \
71	int newcnt = cur ? cur << 1 : 16; \	155	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	156	do \
		157	{ \
		158	newcnt = array_roundsize (base, newcnt << 1); \
		159	} \
		160	while ((cnt) > newcnt); \
		161	\
73	base = realloc (base, sizeof (base) (newcnt)); \	162	base = realloc (base, sizeof (base) (newcnt)); \
74	init (base + cur, newcnt - cur); \	163	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	164	cur = newcnt; \
76	}	165	}
77		166
		167	/*****************************************************************************/
		168
78	typedef struct	169	typedef struct
79	{	170	{
80	struct ev_io *head;	171	struct ev_io *head;
81	unsigned char wev, rev; /* want, received event set */	172	unsigned char events;
		173	unsigned char reify;
82	} ANFD;	174	} ANFD;
83		175
84	static ANFD *anfds;	176	static ANFD *anfds;
85	static int anfdmax;	177	static int anfdmax;
86		178
87	static int *fdchanges;
88	static int fdchangemax, fdchangecnt;
89
90	static void	179	static void
91	anfds_init (ANFD *base, int count)	180	anfds_init (ANFD *base, int count)
92	{	181	{
93	while (count--)	182	while (count--)
94	{	183	{
95	base->head = 0;	184	base->head = 0;
96	base->wev = base->rev = EV_NONE;	185	base->events = EV_NONE;
		186	base->reify = 0;
		187
97	++base;	188	++base;
98	}	189	}
99	}	190	}
100		191
101	typedef struct	192	typedef struct
102	{	193	{
103	struct ev_watcher *w;	194	W w;
104	int events;	195	int events;
105	} ANPENDING;	196	} ANPENDING;
106		197
107	static ANPENDING *pendings;	198	static ANPENDING *pendings;
108	static int pendingmax, pendingcnt;	199	static int pendingmax, pendingcnt;
109		200
110	static void	201	static void
111	event (struct ev_watcher *w, int events)	202	event (W w, int events)
112	{	203	{
		204	if (w->pending)
		205	{
		206	pendings [w->pending - 1].events \|= events;
		207	return;
		208	}
		209
113	w->pending = ++pendingcnt;	210	w->pending = ++pendingcnt;
114	array_needsize (pendings, pendingmax, pendingcnt, );	211	array_needsize (pendings, pendingmax, pendingcnt, );
115	pendings [pendingcnt - 1].w = w;	212	pendings [pendingcnt - 1].w = w;
116	pendings [pendingcnt - 1].events = events;	213	pendings [pendingcnt - 1].events = events;
117	}	214	}
118		215
119	static void	216	static void
		217	queue_events (W *events, int eventcnt, int type)
		218	{
		219	int i;
		220
		221	for (i = 0; i < eventcnt; ++i)
		222	event (events [i], type);
		223	}
		224
		225	static void
120	fd_event (int fd, int events)	226	fd_event (int fd, int events)
121	{	227	{
122	ANFD *anfd = anfds + fd;	228	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	229	struct ev_io *w;
124		230
125	for (w = anfd->head; w; w = w->next)	231	for (w = anfd->head; w; w = w->next)
126	{	232	{
127	int ev = w->events & events;	233	int ev = w->events & events;
128		234
129	if (ev)	235	if (ev)
130	event ((struct ev_watcher *)w, ev);	236	event ((W)w, ev);
		237	}
		238	}
		239
		240	/*****************************************************************************/
		241
		242	static int *fdchanges;
		243	static int fdchangemax, fdchangecnt;
		244
		245	static void
		246	fd_reify (void)
		247	{
		248	int i;
		249
		250	for (i = 0; i < fdchangecnt; ++i)
		251	{
		252	int fd = fdchanges [i];
		253	ANFD *anfd = anfds + fd;
		254	struct ev_io *w;
		255
		256	int events = 0;
		257
		258	for (w = anfd->head; w; w = w->next)
		259	events \|= w->events;
		260
		261	anfd->reify = 0;
		262
		263	if (anfd->events != events)
		264	{
		265	method_modify (fd, anfd->events, events);
		266	anfd->events = events;
		267	}
		268	}
		269
		270	fdchangecnt = 0;
		271	}
		272
		273	static void
		274	fd_change (int fd)
		275	{
		276	if (anfds [fd].reify \|\| fdchangecnt < 0)
		277	return;
		278
		279	anfds [fd].reify = 1;
		280
		281	++fdchangecnt;
		282	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		283	fdchanges [fdchangecnt - 1] = fd;
		284	}
		285
		286	static void
		287	fd_kill (int fd)
		288	{
		289	struct ev_io *w;
		290
		291	printf ("killing fd %d\n", fd);//D
		292	while ((w = anfds [fd].head))
		293	{
		294	ev_io_stop (w);
		295	event ((W)w, EV_ERROR \| EV_READ \| EV_WRITE);
		296	}
		297	}
		298
		299	/* called on EBADF to verify fds */
		300	static void
		301	fd_ebadf (void)
		302	{
		303	int fd;
		304
		305	for (fd = 0; fd < anfdmax; ++fd)
		306	if (anfds [fd].events)
		307	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		308	fd_kill (fd);
		309	}
		310
		311	/* called on ENOMEM in select/poll to kill some fds and retry */
		312	static void
		313	fd_enomem (void)
		314	{
		315	int fd = anfdmax;
		316
		317	while (fd--)
		318	if (anfds [fd].events)
		319	{
		320	close (fd);
		321	fd_kill (fd);
		322	return;
131	}	323	}
132	}	324	}
		325
		326	/*****************************************************************************/
133		327
134	static struct ev_timer **timers;	328	static struct ev_timer **timers;
135	static int timermax, timercnt;	329	static int timermax, timercnt;
136		330
		331	static struct ev_periodic **periodics;
		332	static int periodicmax, periodiccnt;
		333
137	static void	334	static void
138	upheap (int k)	335	upheap (WT *timers, int k)
139	{	336	{
140	struct ev_timer *w = timers [k];	337	WT w = timers [k];
141		338
142	while (k && timers [k >> 1]->at > w->at)	339	while (k && timers [k >> 1]->at > w->at)
143	{	340	{
144	timers [k] = timers [k >> 1];	341	timers [k] = timers [k >> 1];
145	timers [k]->active = k + 1;	342	timers [k]->active = k + 1;
…		…
150	timers [k]->active = k + 1;	347	timers [k]->active = k + 1;
151		348
152	}	349	}
153		350
154	static void	351	static void
155	downheap (int k)	352	downheap (WT *timers, int N, int k)
156	{	353	{
157	struct ev_timer *w = timers [k];	354	WT w = timers [k];
158		355
159	while (k < (timercnt >> 1))	356	while (k < (N >> 1))
160	{	357	{
161	int j = k << 1;	358	int j = k << 1;
162		359
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	360	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
164	++j;	361	++j;
165		362
166	if (w->at <= timers [j]->at)	363	if (w->at <= timers [j]->at)
167	break;	364	break;
168		365
…		…
173		370
174	timers [k] = w;	371	timers [k] = w;
175	timers [k]->active = k + 1;	372	timers [k]->active = k + 1;
176	}	373	}
177		374
178	static struct ev_signal **signals;	375	/*****************************************************************************/
		376
		377	typedef struct
		378	{
		379	struct ev_signal *head;
		380	sig_atomic_t volatile gotsig;
		381	} ANSIG;
		382
		383	static ANSIG *signals;
179	static int signalmax, signalcnt;	384	static int signalmax;
180		385
		386	static int sigpipe [2];
		387	static sig_atomic_t volatile gotsig;
		388	static struct ev_io sigev;
		389
181	static void	390	static void
182	signals_init (struct ev_signal **base, int count)	391	signals_init (ANSIG *base, int count)
183	{	392	{
184	while (count--)	393	while (count--)
185	*base++ = 0;	394	{
186	}	395	base->head = 0;
		396	base->gotsig = 0;
187		397
		398	++base;
		399	}
		400	}
		401
		402	static void
		403	sighandler (int signum)
		404	{
		405	signals [signum - 1].gotsig = 1;
		406
		407	if (!gotsig)
		408	{
		409	gotsig = 1;
		410	write (sigpipe [1], &signum, 1);
		411	}
		412	}
		413
		414	static void
		415	sigcb (struct ev_io *iow, int revents)
		416	{
		417	struct ev_signal *w;
		418	int signum;
		419
		420	read (sigpipe [0], &revents, 1);
		421	gotsig = 0;
		422
		423	for (signum = signalmax; signum--; )
		424	if (signals [signum].gotsig)
		425	{
		426	signals [signum].gotsig = 0;
		427
		428	for (w = signals [signum].head; w; w = w->next)
		429	event ((W)w, EV_SIGNAL);
		430	}
		431	}
		432
		433	static void
		434	siginit (void)
		435	{
		436	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		437	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		438
		439	/* rather than sort out wether we really need nb, set it */
		440	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		441	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		442
		443	ev_io_set (&sigev, sigpipe [0], EV_READ);
		444	ev_io_start (&sigev);
		445	}
		446
		447	/*****************************************************************************/
		448
		449	static struct ev_idle **idles;
		450	static int idlemax, idlecnt;
		451
		452	static struct ev_prepare **prepares;
		453	static int preparemax, preparecnt;
		454
		455	static struct ev_check **checks;
		456	static int checkmax, checkcnt;
		457
		458	/*****************************************************************************/
		459
		460	static struct ev_child *childs [PID_HASHSIZE];
		461	static struct ev_signal childev;
		462
		463	#ifndef WCONTINUED
		464	# define WCONTINUED 0
		465	#endif
		466
		467	static void
		468	childcb (struct ev_signal *sw, int revents)
		469	{
		470	struct ev_child *w;
		471	int pid, status;
		472
		473	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		474	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		475	if (w->pid == pid \|\| !w->pid)
		476	{
		477	w->status = status;
		478	event ((W)w, EV_CHILD);
		479	}
		480	}
		481
		482	/*****************************************************************************/
		483
188	#if HAVE_EPOLL	484	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	485	# include "ev_epoll.c"
190	#endif	486	#endif
		487	#if EV_USE_POLL
		488	# include "ev_poll.c"
		489	#endif
191	#if HAVE_SELECT	490	#if EV_USE_SELECT
192	# include "ev_select.c"	491	# include "ev_select.c"
193	#endif	492	#endif
194		493
		494	int
		495	ev_version_major (void)
		496	{
		497	return EV_VERSION_MAJOR;
		498	}
		499
		500	int
		501	ev_version_minor (void)
		502	{
		503	return EV_VERSION_MINOR;
		504	}
		505
		506	/* return true if we are running with elevated privileges and ignore env variables */
		507	static int
		508	enable_secure ()
		509	{
		510	return getuid () != geteuid ()
		511	\|\| getgid () != getegid ();
		512	}
		513
195	int ev_init (int flags)	514	int ev_init (int methods)
196	{	515	{
		516	if (!ev_method)
		517	{
197	#if HAVE_MONOTONIC	518	#if EV_USE_MONOTONIC
198	{	519	{
199	struct timespec ts;	520	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	521	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	522	have_monotonic = 1;
202	}	523	}
203	#endif	524	#endif
204		525
205	ev_now = ev_time ();	526	ev_now = ev_time ();
		527	now = get_clock ();
		528	now_floor = now;
		529	diff = ev_now - now;
206		530
		531	if (pipe (sigpipe))
		532	return 0;
		533
		534	if (methods == EVMETHOD_AUTO)
		535	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		536	methods = atoi (getenv ("LIBEV_METHODS"));
		537	else
		538	methods = EVMETHOD_ANY;
		539
		540	ev_method = 0;
207	#if HAVE_EPOLL	541	#if EV_USE_EPOLL
208	if (epoll_init (flags))	542	if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods);
209	return ev_method;
210	#endif	543	#endif
		544	#if EV_USE_POLL
		545	if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
		546	#endif
211	#if HAVE_SELECT	547	#if EV_USE_SELECT
212	if (select_init (flags))	548	if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
213	return ev_method;
214	#endif	549	#endif
215		550
216	ev_method = EVMETHOD_NONE;	551	if (ev_method)
		552	{
		553	ev_watcher_init (&sigev, sigcb);
		554	siginit ();
		555
		556	ev_signal_init (&childev, childcb, SIGCHLD);
		557	ev_signal_start (&childev);
		558	}
		559	}
		560
217	return ev_method;	561	return ev_method;
218	}	562	}
219		563
220	void ev_prefork (void)	564	/*****************************************************************************/
221	{
222	}
223		565
		566	void
		567	ev_fork_prepare (void)
		568	{
		569	/* nop */
		570	}
		571
		572	void
224	void ev_postfork_parent (void)	573	ev_fork_parent (void)
225	{	574	{
		575	/* nop */
226	}	576	}
227		577
		578	void
228	void ev_postfork_child (void)	579	ev_fork_child (void)
229	{	580	{
230	#if HAVE_EPOLL	581	#if EV_USE_EPOLL
		582	if (ev_method == EVMETHOD_EPOLL)
231	epoll_postfork_child ();	583	epoll_postfork_child ();
232	#endif	584	#endif
233	}
234		585
		586	ev_io_stop (&sigev);
		587	close (sigpipe [0]);
		588	close (sigpipe [1]);
		589	pipe (sigpipe);
		590	siginit ();
		591	}
		592
		593	/*****************************************************************************/
		594
235	static void	595	static void
236	call_pending ()	596	call_pending (void)
237	{	597	{
238	int i;	598	while (pendingcnt)
239
240	for (i = 0; i < pendingcnt; ++i)
241	{	599	{
242	ANPENDING *p = pendings + i;	600	ANPENDING *p = pendings + --pendingcnt;
243		601
244	if (p->w)	602	if (p->w)
245	{	603	{
246	p->w->pending = 0;	604	p->w->pending = 0;
247	p->w->cb (p->w, p->events);	605	p->w->cb (p->w, p->events);
248	}	606	}
249	}	607	}
250
251	pendingcnt = 0;
252	}	608	}
253		609
254	static void	610	static void
255	timer_reify (void)	611	timers_reify (void)
256	{	612	{
257	while (timercnt && timers [0]->at <= ev_now)	613	while (timercnt && timers [0]->at <= now)
258	{	614	{
259	struct ev_timer *w = timers [0];	615	struct ev_timer *w = timers [0];
260		616
261	/* first reschedule timer */	617	/* first reschedule or stop timer */
262	if (w->repeat)	618	if (w->repeat)
263	{	619	{
264	if (w->is_abs)	620	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;	621	w->at = now + w->repeat;
268		622	downheap ((WT *)timers, timercnt, 0);
269	downheap (0);
270	}	623	}
271	else	624	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	625	ev_timer_stop (w); /* nonrepeating: stop timer */
273		626
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	627	event ((W)w, EV_TIMEOUT);
		628	}
		629	}
		630
		631	static void
		632	periodics_reify (void)
		633	{
		634	while (periodiccnt && periodics [0]->at <= ev_now)
		635	{
		636	struct ev_periodic *w = periodics [0];
		637
		638	/* first reschedule or stop timer */
		639	if (w->interval)
		640	{
		641	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		642	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
		643	downheap ((WT *)periodics, periodiccnt, 0);
		644	}
		645	else
		646	ev_periodic_stop (w); /* nonrepeating: stop timer */
		647
		648	event ((W)w, EV_PERIODIC);
		649	}
		650	}
		651
		652	static void
		653	periodics_reschedule (ev_tstamp diff)
		654	{
		655	int i;
		656
		657	/* adjust periodics after time jump */
		658	for (i = 0; i < periodiccnt; ++i)
		659	{
		660	struct ev_periodic *w = periodics [i];
		661
		662	if (w->interval)
		663	{
		664	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		665
		666	if (fabs (diff) >= 1e-4)
		667	{
		668	ev_periodic_stop (w);
		669	ev_periodic_start (w);
		670
		671	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		672	}
		673	}
		674	}
		675	}
		676
		677	static int
		678	time_update_monotonic (void)
		679	{
		680	now = get_clock ();
		681
		682	if (expect_true (now - now_floor < MIN_TIMEJUMP * .5))
		683	{
		684	ev_now = now + diff;
		685	return 0;
		686	}
		687	else
		688	{
		689	now_floor = now;
		690	ev_now = ev_time ();
		691	return 1;
		692	}
		693	}
		694
		695	static void
		696	time_update (void)
		697	{
		698	int i;
		699
		700	#if EV_USE_MONOTONIC
		701	if (expect_true (have_monotonic))
		702	{
		703	if (time_update_monotonic ())
		704	{
		705	ev_tstamp odiff = diff;
		706
		707	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		708	{
		709	diff = ev_now - now;
		710
		711	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		712	return; /* all is well */
		713
		714	ev_now = ev_time ();
		715	now = get_clock ();
		716	now_floor = now;
		717	}
		718
		719	periodics_reschedule (diff - odiff);
		720	/* no timer adjustment, as the monotonic clock doesn't jump */
		721	}
		722	}
		723	else
		724	#endif
		725	{
		726	ev_now = ev_time ();
		727
		728	if (expect_false (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		729	{
		730	periodics_reschedule (ev_now - now);
		731
		732	/* adjust timers. this is easy, as the offset is the same for all */
		733	for (i = 0; i < timercnt; ++i)
		734	timers [i]->at += diff;
		735	}
		736
		737	now = ev_now;
275	}	738	}
276	}	739	}
277		740
278	int ev_loop_done;	741	int ev_loop_done;
279		742
280	int ev_loop (int flags)	743	void ev_loop (int flags)
281	{	744	{
282	double block;	745	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	746	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
284		747
285	do	748	do
286	{	749	{
		750	/* queue check watchers (and execute them) */
		751	if (expect_false (preparecnt))
		752	{
		753	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		754	call_pending ();
		755	}
		756
287	/* update fd-related kernel structures */	757	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	758	fd_reify ();
289		759
290	/* calculate blocking time */	760	/* calculate blocking time */
		761
		762	/* we only need this for !monotonic clockor timers, but as we basically
		763	always have timers, we just calculate it always */
		764	#if EV_USE_MONOTONIC
		765	if (expect_true (have_monotonic))
		766	time_update_monotonic ();
		767	else
		768	#endif
		769	{
291	ev_now = ev_time ();	770	ev_now = ev_time ();
		771	now = ev_now;
		772	}
292		773
293	if (flags & EVLOOP_NONBLOCK)	774	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
294	block = 0.;	775	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	776	else
298	{	777	{
		778	block = MAX_BLOCKTIME;
		779
		780	if (timercnt)
		781	{
299	block = timers [0]->at - ev_now + method_fudge;	782	ev_tstamp to = timers [0]->at - now + method_fudge;
		783	if (block > to) block = to;
		784	}
		785
		786	if (periodiccnt)
		787	{
		788	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
		789	if (block > to) block = to;
		790	}
		791
300	if (block < 0.) block = 0.;	792	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	793	}
303		794
304	method_poll (block);	795	method_poll (block);
305		796
		797	/* update ev_now, do magic */
		798	time_update ();
		799
306	/* put pending timers into pendign queue and reschedule them */	800	/* queue pending timers and reschedule them */
307	timer_reify ();	801	timers_reify (); /* relative timers called last */
		802	periodics_reify (); /* absolute timers called first */
308		803
309	ev_now = ev_time ();	804	/* queue idle watchers unless io or timers are pending */
		805	if (!pendingcnt)
		806	queue_events ((W *)idles, idlecnt, EV_IDLE);
		807
		808	/* queue check watchers, to be executed first */
		809	if (checkcnt)
		810	queue_events ((W *)checks, checkcnt, EV_CHECK);
		811
310	call_pending ();	812	call_pending ();
311	}	813	}
312	while (!ev_loop_done);	814	while (!ev_loop_done);
313	}
314		815
		816	if (ev_loop_done != 2)
		817	ev_loop_done = 0;
		818	}
		819
		820	/*****************************************************************************/
		821
315	static void	822	static void
316	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	823	wlist_add (WL *head, WL elem)
317	{	824	{
318	elem->next = *head;	825	elem->next = *head;
319	*head = elem;	826	*head = elem;
320	}	827	}
321		828
322	static void	829	static void
323	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	830	wlist_del (WL *head, WL elem)
324	{	831	{
325	while (*head)	832	while (*head)
326	{	833	{
327	if (*head == elem)	834	if (*head == elem)
328	{	835	{
…		…
333	head = &(*head)->next;	840	head = &(*head)->next;
334	}	841	}
335	}	842	}
336		843
337	static void	844	static void
338	ev_start (struct ev_watcher *w, int active)	845	ev_clear_pending (W w)
339	{	846	{
		847	if (w->pending)
		848	{
		849	pendings [w->pending - 1].w = 0;
340	w->pending = 0;	850	w->pending = 0;
		851	}
		852	}
		853
		854	static void
		855	ev_start (W w, int active)
		856	{
341	w->active = active;	857	w->active = active;
342	}	858	}
343		859
344	static void	860	static void
345	ev_stop (struct ev_watcher *w)	861	ev_stop (W w)
346	{	862	{
347	if (w->pending)
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	863	w->active = 0;
351	/* nop */
352	}	864	}
353		865
		866	/*****************************************************************************/
		867
354	void	868	void
355	evio_start (struct ev_io *w)	869	ev_io_start (struct ev_io *w)
356	{	870	{
		871	int fd = w->fd;
		872
357	if (ev_is_active (w))	873	if (ev_is_active (w))
358	return;	874	return;
359		875
360	int fd = w->fd;	876	assert (("ev_io_start called with negative fd", fd >= 0));
361		877
362	ev_start ((struct ev_watcher *)w, 1);	878	ev_start ((W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	879	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	880	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		881
366	++fdchangecnt;	882	fd_change (fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	883	}
370		884
371	void	885	void
372	evio_stop (struct ev_io *w)	886	ev_io_stop (struct ev_io *w)
373	{	887	{
		888	ev_clear_pending ((W)w);
374	if (!ev_is_active (w))	889	if (!ev_is_active (w))
375	return;	890	return;
376		891
377	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	892	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	893	ev_stop ((W)w);
379		894
380	++fdchangecnt;	895	fd_change (w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	896	}
384		897
385	void	898	void
386	evtimer_start (struct ev_timer *w)	899	ev_timer_start (struct ev_timer *w)
387	{	900	{
388	if (ev_is_active (w))	901	if (ev_is_active (w))
389	return;	902	return;
390		903
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;	904	w->at += now;
399		905
400	ev_start ((struct ev_watcher *)w, ++timercnt);	906	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		907
		908	ev_start ((W)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );	909	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;	910	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);	911	upheap ((WT *)timers, timercnt - 1);
404	}	912	}
405		913
406	void	914	void
407	evtimer_stop (struct ev_timer *w)	915	ev_timer_stop (struct ev_timer *w)
408	{	916	{
		917	ev_clear_pending ((W)w);
409	if (!ev_is_active (w))	918	if (!ev_is_active (w))
410	return;	919	return;
411		920
412	if (w->active < timercnt--)	921	if (w->active < timercnt--)
413	{	922	{
414	timers [w->active - 1] = timers [timercnt];	923	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);	924	downheap ((WT *)timers, timercnt, w->active - 1);
416	}	925	}
417		926
418	ev_stop ((struct ev_watcher *)w);	927	w->at = w->repeat;
419	}
420		928
		929	ev_stop ((W)w);
		930	}
		931
421	void	932	void
422	evsignal_start (struct ev_signal *w)	933	ev_timer_again (struct ev_timer *w)
423	{	934	{
424	if (ev_is_active (w))	935	if (ev_is_active (w))
425	return;	936	{
		937	if (w->repeat)
		938	{
		939	w->at = now + w->repeat;
		940	downheap ((WT *)timers, timercnt, w->active - 1);
		941	}
		942	else
		943	ev_timer_stop (w);
		944	}
		945	else if (w->repeat)
		946	ev_timer_start (w);
		947	}
426		948
427	ev_start ((struct ev_watcher *)w, 1);	949	void
		950	ev_periodic_start (struct ev_periodic *w)
		951	{
		952	if (ev_is_active (w))
		953	return;
		954
		955	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		956
		957	/* this formula differs from the one in periodic_reify because we do not always round up */
		958	if (w->interval)
		959	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		960
		961	ev_start ((W)w, ++periodiccnt);
		962	array_needsize (periodics, periodicmax, periodiccnt, );
		963	periodics [periodiccnt - 1] = w;
		964	upheap ((WT *)periodics, periodiccnt - 1);
		965	}
		966
		967	void
		968	ev_periodic_stop (struct ev_periodic *w)
		969	{
		970	ev_clear_pending ((W)w);
		971	if (!ev_is_active (w))
		972	return;
		973
		974	if (w->active < periodiccnt--)
		975	{
		976	periodics [w->active - 1] = periodics [periodiccnt];
		977	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		978	}
		979
		980	ev_stop ((W)w);
		981	}
		982
		983	void
		984	ev_signal_start (struct ev_signal *w)
		985	{
		986	if (ev_is_active (w))
		987	return;
		988
		989	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		990
		991	ev_start ((W)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);	992	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	993	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
430	}
431		994
		995	if (!w->next)
		996	{
		997	struct sigaction sa;
		998	sa.sa_handler = sighandler;
		999	sigfillset (&sa.sa_mask);
		1000	sa.sa_flags = 0;
		1001	sigaction (w->signum, &sa, 0);
		1002	}
		1003	}
		1004
432	void	1005	void
433	evsignal_stop (struct ev_signal *w)	1006	ev_signal_stop (struct ev_signal *w)
434	{	1007	{
		1008	ev_clear_pending ((W)w);
435	if (!ev_is_active (w))	1009	if (!ev_is_active (w))
436	return;	1010	return;
437		1011
438	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	1012	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1013	ev_stop ((W)w);
		1014
		1015	if (!signals [w->signum - 1].head)
		1016	signal (w->signum, SIG_DFL);
		1017	}
		1018
		1019	void
		1020	ev_idle_start (struct ev_idle *w)
		1021	{
		1022	if (ev_is_active (w))
		1023	return;
		1024
		1025	ev_start ((W)w, ++idlecnt);
		1026	array_needsize (idles, idlemax, idlecnt, );
		1027	idles [idlecnt - 1] = w;
		1028	}
		1029
		1030	void
		1031	ev_idle_stop (struct ev_idle *w)
		1032	{
		1033	ev_clear_pending ((W)w);
		1034	if (ev_is_active (w))
		1035	return;
		1036
		1037	idles [w->active - 1] = idles [--idlecnt];
		1038	ev_stop ((W)w);
		1039	}
		1040
		1041	void
		1042	ev_prepare_start (struct ev_prepare *w)
		1043	{
		1044	if (ev_is_active (w))
		1045	return;
		1046
		1047	ev_start ((W)w, ++preparecnt);
		1048	array_needsize (prepares, preparemax, preparecnt, );
		1049	prepares [preparecnt - 1] = w;
		1050	}
		1051
		1052	void
		1053	ev_prepare_stop (struct ev_prepare *w)
		1054	{
		1055	ev_clear_pending ((W)w);
		1056	if (ev_is_active (w))
		1057	return;
		1058
		1059	prepares [w->active - 1] = prepares [--preparecnt];
		1060	ev_stop ((W)w);
		1061	}
		1062
		1063	void
		1064	ev_check_start (struct ev_check *w)
		1065	{
		1066	if (ev_is_active (w))
		1067	return;
		1068
		1069	ev_start ((W)w, ++checkcnt);
		1070	array_needsize (checks, checkmax, checkcnt, );
		1071	checks [checkcnt - 1] = w;
		1072	}
		1073
		1074	void
439	ev_stop ((struct ev_watcher *)w);	1075	ev_check_stop (struct ev_check *w)
440	}	1076	{
		1077	ev_clear_pending ((W)w);
		1078	if (ev_is_active (w))
		1079	return;
441		1080
		1081	checks [w->active - 1] = checks [--checkcnt];
		1082	ev_stop ((W)w);
		1083	}
		1084
		1085	void
		1086	ev_child_start (struct ev_child *w)
		1087	{
		1088	if (ev_is_active (w))
		1089	return;
		1090
		1091	ev_start ((W)w, 1);
		1092	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1093	}
		1094
		1095	void
		1096	ev_child_stop (struct ev_child *w)
		1097	{
		1098	ev_clear_pending ((W)w);
		1099	if (ev_is_active (w))
		1100	return;
		1101
		1102	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1103	ev_stop ((W)w);
		1104	}
		1105
442	/*****************************************************************************/	1106	/*****************************************************************************/
		1107
		1108	struct ev_once
		1109	{
		1110	struct ev_io io;
		1111	struct ev_timer to;
		1112	void (cb)(int revents, void arg);
		1113	void *arg;
		1114	};
		1115
		1116	static void
		1117	once_cb (struct ev_once *once, int revents)
		1118	{
		1119	void (cb)(int revents, void arg) = once->cb;
		1120	void *arg = once->arg;
		1121
		1122	ev_io_stop (&once->io);
		1123	ev_timer_stop (&once->to);
		1124	free (once);
		1125
		1126	cb (revents, arg);
		1127	}
		1128
		1129	static void
		1130	once_cb_io (struct ev_io *w, int revents)
		1131	{
		1132	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1133	}
		1134
		1135	static void
		1136	once_cb_to (struct ev_timer *w, int revents)
		1137	{
		1138	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1139	}
		1140
		1141	void
		1142	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1143	{
		1144	struct ev_once *once = malloc (sizeof (struct ev_once));
		1145
		1146	if (!once)
		1147	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1148	else
		1149	{
		1150	once->cb = cb;
		1151	once->arg = arg;
		1152
		1153	ev_watcher_init (&once->io, once_cb_io);
		1154	if (fd >= 0)
		1155	{
		1156	ev_io_set (&once->io, fd, events);
		1157	ev_io_start (&once->io);
		1158	}
		1159
		1160	ev_watcher_init (&once->to, once_cb_to);
		1161	if (timeout >= 0.)
		1162	{
		1163	ev_timer_set (&once->to, timeout, 0.);
		1164	ev_timer_start (&once->to);
		1165	}
		1166	}
		1167	}
		1168
		1169	/*****************************************************************************/
		1170
443	#if 1	1171	#if 0
		1172
		1173	struct ev_io wio;
444		1174
445	static void	1175	static void
446	sin_cb (struct ev_io *w, int revents)	1176	sin_cb (struct ev_io *w, int revents)
447	{	1177	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1178	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}	1179	}
450		1180
451	static void	1181	static void
452	ocb (struct ev_timer *w, int revents)	1182	ocb (struct ev_timer *w, int revents)
453	{	1183	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1184	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1185	ev_timer_stop (w);
		1186	ev_timer_start (w);
		1187	}
		1188
		1189	static void
		1190	scb (struct ev_signal *w, int revents)
		1191	{
		1192	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1193	ev_io_stop (&wio);
		1194	ev_io_start (&wio);
		1195	}
		1196
		1197	static void
		1198	gcb (struct ev_signal *w, int revents)
		1199	{
		1200	fprintf (stderr, "generic %x\n", revents);
		1201
455	}	1202	}
456		1203
457	int main (void)	1204	int main (void)
458	{	1205	{
459	struct ev_io sin;
460
461	ev_init (0);	1206	ev_init (0);
462		1207
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);	1208	ev_io_init (&wio, sin_cb, 0, EV_READ);
465	evio_start (&sin);	1209	ev_io_start (&wio);
466		1210
467	struct ev_timer t[1000];	1211	struct ev_timer t[10000];
468		1212
		1213	#if 0
469	int i;	1214	int i;
470	for (i = 0; i < 1000; ++i)	1215	for (i = 0; i < 10000; ++i)
471	{	1216	{
472	struct ev_timer *w = t + i;	1217	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);	1218	ev_watcher_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);	1219	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
475	evtimer_start (w);	1220	ev_timer_start (w);
476	if (drand48 () < 0.5)	1221	if (drand48 () < 0.5)
477	evtimer_stop (w);	1222	ev_timer_stop (w);
478	}	1223	}
		1224	#endif
		1225
		1226	struct ev_timer t1;
		1227	ev_timer_init (&t1, ocb, 5, 10);
		1228	ev_timer_start (&t1);
		1229
		1230	struct ev_signal sig;
		1231	ev_signal_init (&sig, scb, SIGQUIT);
		1232	ev_signal_start (&sig);
		1233
		1234	struct ev_check cw;
		1235	ev_check_init (&cw, gcb);
		1236	ev_check_start (&cw);
		1237
		1238	struct ev_idle iw;
		1239	ev_idle_init (&iw, gcb);
		1240	ev_idle_start (&iw);
479		1241
480	ev_loop (0);	1242	ev_loop (0);
481		1243
482	return 0;	1244	return 0;
483	}	1245	}

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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 1.41 by root, Fri Nov 2 16:54:34 2007 UTC

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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 1.41 by root, Fri Nov 2 16:54:34 2007 UTC