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

Comparing libev/ev.c (file contents):
Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.38 by root, Thu Nov 1 15:21:13 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
6	#include <assert.h>	44	#include <assert.h>
7	#include <errno.h>	45	#include <errno.h>
		46	#include <sys/types.h>
		47	#include <sys/wait.h>
8	#include <sys/time.h>	48	#include <sys/time.h>
9	#include <time.h>	49	#include <time.h>
10		50
		51	#ifndef EV_USE_MONOTONIC
		52	# define EV_USE_MONOTONIC 1
		53	#endif
		54
11	#ifdef CLOCK_MONOTONIC	55	#ifndef CLOCK_MONOTONIC
		56	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	57	# define EV_USE_MONOTONIC 0
13	#endif	58	#endif
14		59
		60	#ifndef EV_USE_SELECT
		61	# define EV_USE_SELECT 1
		62	#endif
		63
		64	#ifndef EV_USE_EPOLL
15	#define HAVE_EPOLL 1	65	# define EV_USE_EPOLL 0
		66	#endif
		67
		68	#ifndef CLOCK_REALTIME
16	#define HAVE_REALTIME 1	69	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 0	70	#endif
		71	#ifndef EV_USE_REALTIME
		72	# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */
		73	#endif
18		74
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	75	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	76	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detetc time jumps) */
		77	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		78	#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
21		79
22	#include "ev.h"	80	#include "ev.h"
23		81
24	struct ev_watcher {	82	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	83	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	84	typedef struct ev_watcher_time *WT;
30	};
31		85
32	static ev_tstamp now, diff; /* monotonic clock */	86	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	87	ev_tstamp ev_now;
34	int ev_method;	88	int ev_method;
35		89
36	static int have_monotonic; /* runtime */	90	static int have_monotonic; /* runtime */
37		91
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	92	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
39	static void (*method_reify)(void);	93	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);	94	static void (*method_poll)(ev_tstamp timeout);
		95
		96	/*****************************************************************************/
41		97
42	ev_tstamp	98	ev_tstamp
43	ev_time (void)	99	ev_time (void)
44	{	100	{
45	#if HAVE_REALTIME	101	#if EV_USE_REALTIME
46	struct timespec ts;	102	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	103	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	104	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	105	#else
50	struct timeval tv;	106	struct timeval tv;
54	}	110	}
55		111
56	static ev_tstamp	112	static ev_tstamp
57	get_clock (void)	113	get_clock (void)
58	{	114	{
59	#if HAVE_MONOTONIC	115	#if EV_USE_MONOTONIC
60	if (have_monotonic)	116	if (have_monotonic)
61	{	117	{
62	struct timespec ts;	118	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	119	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	120	return ts.tv_sec + ts.tv_nsec * 1e-9;
…		…
66	#endif	122	#endif
67		123
68	return ev_time ();	124	return ev_time ();
69	}	125	}
70		126
		127	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		128
71	#define array_needsize(base,cur,cnt,init) \	129	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	130	if ((cnt) > cur) \
73	{ \	131	{ \
74	int newcnt = cur ? cur << 1 : 16; \	132	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	133	do \
		134	{ \
		135	newcnt = array_roundsize (base, newcnt << 1); \
		136	} \
		137	while ((cnt) > newcnt); \
		138	\
76	base = realloc (base, sizeof (base) (newcnt)); \	139	base = realloc (base, sizeof (base) (newcnt)); \
77	init (base + cur, newcnt - cur); \	140	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	141	cur = newcnt; \
79	}	142	}
80		143
		144	/*****************************************************************************/
		145
81	typedef struct	146	typedef struct
82	{	147	{
83	struct ev_io *head;	148	struct ev_io *head;
84	unsigned char wev, rev; /* want, received event set */	149	unsigned char events;
		150	unsigned char reify;
85	} ANFD;	151	} ANFD;
86		152
87	static ANFD *anfds;	153	static ANFD *anfds;
88	static int anfdmax;	154	static int anfdmax;
89		155
90	static int *fdchanges;
91	static int fdchangemax, fdchangecnt;
92
93	static void	156	static void
94	anfds_init (ANFD *base, int count)	157	anfds_init (ANFD *base, int count)
95	{	158	{
96	while (count--)	159	while (count--)
97	{	160	{
98	base->head = 0;	161	base->head = 0;
99	base->wev = base->rev = EV_NONE;	162	base->events = EV_NONE;
		163	base->reify = 0;
		164
100	++base;	165	++base;
101	}	166	}
102	}	167	}
103		168
104	typedef struct	169	typedef struct
105	{	170	{
106	struct ev_watcher *w;	171	W w;
107	int events;	172	int events;
108	} ANPENDING;	173	} ANPENDING;
109		174
110	static ANPENDING *pendings;	175	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;	176	static int pendingmax, pendingcnt;
112		177
113	static void	178	static void
114	event (struct ev_watcher *w, int events)	179	event (W w, int events)
115	{	180	{
		181	if (w->pending)
		182	{
		183	pendings [w->pending - 1].events \|= events;
		184	return;
		185	}
		186
116	w->pending = ++pendingcnt;	187	w->pending = ++pendingcnt;
117	array_needsize (pendings, pendingmax, pendingcnt, );	188	array_needsize (pendings, pendingmax, pendingcnt, );
118	pendings [pendingcnt - 1].w = w;	189	pendings [pendingcnt - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	190	pendings [pendingcnt - 1].events = events;
120	}	191	}
121		192
122	static void	193	static void
		194	queue_events (W *events, int eventcnt, int type)
		195	{
		196	int i;
		197
		198	for (i = 0; i < eventcnt; ++i)
		199	event (events [i], type);
		200	}
		201
		202	static void
123	fd_event (int fd, int events)	203	fd_event (int fd, int events)
124	{	204	{
125	ANFD *anfd = anfds + fd;	205	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	206	struct ev_io *w;
127		207
128	for (w = anfd->head; w; w = w->next)	208	for (w = anfd->head; w; w = w->next)
129	{	209	{
130	int ev = w->events & events;	210	int ev = w->events & events;
131		211
132	if (ev)	212	if (ev)
133	event ((struct ev_watcher *)w, ev);	213	event ((W)w, ev);
		214	}
		215	}
		216
		217	/*****************************************************************************/
		218
		219	static int *fdchanges;
		220	static int fdchangemax, fdchangecnt;
		221
		222	static void
		223	fd_reify (void)
		224	{
		225	int i;
		226
		227	for (i = 0; i < fdchangecnt; ++i)
134	}	228	{
135	}	229	int fd = fdchanges [i];
		230	ANFD *anfd = anfds + fd;
		231	struct ev_io *w;
136		232
		233	int events = 0;
		234
		235	for (w = anfd->head; w; w = w->next)
		236	events \|= w->events;
		237
		238	anfd->reify = 0;
		239
		240	if (anfd->events != events)
		241	{
		242	method_modify (fd, anfd->events, events);
		243	anfd->events = events;
		244	}
		245	}
		246
		247	fdchangecnt = 0;
		248	}
		249
		250	static void
		251	fd_change (int fd)
		252	{
		253	if (anfds [fd].reify \|\| fdchangecnt < 0)
		254	return;
		255
		256	anfds [fd].reify = 1;
		257
		258	++fdchangecnt;
		259	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		260	fdchanges [fdchangecnt - 1] = fd;
		261	}
		262
		263	/* called on EBADF to verify fds */
		264	static void
		265	fd_recheck (void)
		266	{
		267	int fd;
		268
		269	for (fd = 0; fd < anfdmax; ++fd)
		270	if (anfds [fd].events)
		271	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		272	while (anfds [fd].head)
		273	{
		274	ev_io_stop (anfds [fd].head);
		275	event ((W)anfds [fd].head, EV_ERROR \| EV_READ \| EV_WRITE);
		276	}
		277	}
		278
		279	/*****************************************************************************/
		280
137	static struct ev_timer **atimers;	281	static struct ev_timer **timers;
138	static int atimermax, atimercnt;	282	static int timermax, timercnt;
139		283
140	static struct ev_timer **rtimers;	284	static struct ev_periodic **periodics;
141	static int rtimermax, rtimercnt;	285	static int periodicmax, periodiccnt;
142		286
143	static void	287	static void
144	upheap (struct ev_timer **timers, int k)	288	upheap (WT *timers, int k)
145	{	289	{
146	struct ev_timer *w = timers [k];	290	WT w = timers [k];
147		291
148	while (k && timers [k >> 1]->at > w->at)	292	while (k && timers [k >> 1]->at > w->at)
149	{	293	{
150	timers [k] = timers [k >> 1];	294	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;	295	timers [k]->active = k + 1;
…		…
156	timers [k]->active = k + 1;	300	timers [k]->active = k + 1;
157		301
158	}	302	}
159		303
160	static void	304	static void
161	downheap (struct ev_timer **timers, int N, int k)	305	downheap (WT *timers, int N, int k)
162	{	306	{
163	struct ev_timer *w = timers [k];	307	WT w = timers [k];
164		308
165	while (k < (N >> 1))	309	while (k < (N >> 1))
166	{	310	{
167	int j = k << 1;	311	int j = k << 1;
168		312
…		…
179		323
180	timers [k] = w;	324	timers [k] = w;
181	timers [k]->active = k + 1;	325	timers [k]->active = k + 1;
182	}	326	}
183		327
184	static struct ev_signal **signals;	328	/*****************************************************************************/
		329
		330	typedef struct
		331	{
		332	struct ev_signal *head;
		333	sig_atomic_t volatile gotsig;
		334	} ANSIG;
		335
		336	static ANSIG *signals;
185	static int signalmax;	337	static int signalmax;
186		338
		339	static int sigpipe [2];
		340	static sig_atomic_t volatile gotsig;
		341	static struct ev_io sigev;
		342
187	static void	343	static void
188	signals_init (struct ev_signal **base, int count)	344	signals_init (ANSIG *base, int count)
189	{	345	{
190	while (count--)	346	while (count--)
191	*base++ = 0;	347	{
192	}	348	base->head = 0;
		349	base->gotsig = 0;
193		350
		351	++base;
		352	}
		353	}
		354
		355	static void
		356	sighandler (int signum)
		357	{
		358	signals [signum - 1].gotsig = 1;
		359
		360	if (!gotsig)
		361	{
		362	gotsig = 1;
		363	write (sigpipe [1], &signum, 1);
		364	}
		365	}
		366
		367	static void
		368	sigcb (struct ev_io *iow, int revents)
		369	{
		370	struct ev_signal *w;
		371	int signum;
		372
		373	read (sigpipe [0], &revents, 1);
		374	gotsig = 0;
		375
		376	for (signum = signalmax; signum--; )
		377	if (signals [signum].gotsig)
		378	{
		379	signals [signum].gotsig = 0;
		380
		381	for (w = signals [signum].head; w; w = w->next)
		382	event ((W)w, EV_SIGNAL);
		383	}
		384	}
		385
		386	static void
		387	siginit (void)
		388	{
		389	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		390	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		391
		392	/* rather than sort out wether we really need nb, set it */
		393	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		394	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		395
		396	ev_io_set (&sigev, sigpipe [0], EV_READ);
		397	ev_io_start (&sigev);
		398	}
		399
		400	/*****************************************************************************/
		401
		402	static struct ev_idle **idles;
		403	static int idlemax, idlecnt;
		404
		405	static struct ev_prepare **prepares;
		406	static int preparemax, preparecnt;
		407
		408	static struct ev_check **checks;
		409	static int checkmax, checkcnt;
		410
		411	/*****************************************************************************/
		412
		413	static struct ev_child *childs [PID_HASHSIZE];
		414	static struct ev_signal childev;
		415
		416	#ifndef WCONTINUED
		417	# define WCONTINUED 0
		418	#endif
		419
		420	static void
		421	childcb (struct ev_signal *sw, int revents)
		422	{
		423	struct ev_child *w;
		424	int pid, status;
		425
		426	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		427	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		428	if (w->pid == pid \|\| w->pid == -1)
		429	{
		430	w->status = status;
		431	event ((W)w, EV_CHILD);
		432	}
		433	}
		434
		435	/*****************************************************************************/
		436
194	#if HAVE_EPOLL	437	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	438	# include "ev_epoll.c"
196	#endif	439	#endif
197	#if HAVE_SELECT	440	#if EV_USE_SELECT
198	# include "ev_select.c"	441	# include "ev_select.c"
199	#endif	442	#endif
200		443
		444	int
		445	ev_version_major (void)
		446	{
		447	return EV_VERSION_MAJOR;
		448	}
		449
		450	int
		451	ev_version_minor (void)
		452	{
		453	return EV_VERSION_MINOR;
		454	}
		455
201	int ev_init (int flags)	456	int ev_init (int flags)
202	{	457	{
		458	if (!ev_method)
		459	{
203	#if HAVE_MONOTONIC	460	#if EV_USE_MONOTONIC
204	{	461	{
205	struct timespec ts;	462	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	463	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	464	have_monotonic = 1;
208	}	465	}
209	#endif	466	#endif
210		467
211	ev_now = ev_time ();	468	ev_now = ev_time ();
212	now = get_clock ();	469	now = get_clock ();
213	diff = ev_now - now;	470	diff = ev_now - now;
214		471
215	#if HAVE_EPOLL	472	if (pipe (sigpipe))
216	if (epoll_init (flags))	473	return 0;
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223		474
224	ev_method = EVMETHOD_NONE;	475	ev_method = EVMETHOD_NONE;
		476	#if EV_USE_EPOLL
		477	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
		478	#endif
		479	#if EV_USE_SELECT
		480	if (ev_method == EVMETHOD_NONE) select_init (flags);
		481	#endif
		482
		483	if (ev_method)
		484	{
		485	ev_watcher_init (&sigev, sigcb);
		486	siginit ();
		487
		488	ev_signal_init (&childev, childcb, SIGCHLD);
		489	ev_signal_start (&childev);
		490	}
		491	}
		492
225	return ev_method;	493	return ev_method;
226	}	494	}
227		495
228	void ev_prefork (void)	496	/*****************************************************************************/
229	{
230	}
231		497
		498	void
		499	ev_fork_prepare (void)
		500	{
		501	/* nop */
		502	}
		503
		504	void
232	void ev_postfork_parent (void)	505	ev_fork_parent (void)
233	{	506	{
		507	/* nop */
234	}	508	}
235		509
		510	void
236	void ev_postfork_child (void)	511	ev_fork_child (void)
237	{	512	{
238	#if HAVE_EPOLL	513	#if EV_USE_EPOLL
		514	if (ev_method == EVMETHOD_EPOLL)
239	epoll_postfork_child ();	515	epoll_postfork_child ();
240	#endif	516	#endif
241	}
242		517
		518	ev_io_stop (&sigev);
		519	close (sigpipe [0]);
		520	close (sigpipe [1]);
		521	pipe (sigpipe);
		522	siginit ();
		523	}
		524
		525	/*****************************************************************************/
		526
243	static void	527	static void
244	call_pending ()	528	call_pending (void)
245	{	529	{
246	int i;	530	while (pendingcnt)
247
248	for (i = 0; i < pendingcnt; ++i)
249	{	531	{
250	ANPENDING *p = pendings + i;	532	ANPENDING *p = pendings + --pendingcnt;
251		533
252	if (p->w)	534	if (p->w)
253	{	535	{
254	p->w->pending = 0;	536	p->w->pending = 0;
255	p->w->cb (p->w, p->events);	537	p->w->cb (p->w, p->events);
256	}	538	}
257	}	539	}
258
259	pendingcnt = 0;
260	}	540	}
261		541
262	static void	542	static void
263	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	543	timers_reify (void)
264	{	544	{
265	while (timercnt && timers [0]->at <= now)	545	while (timercnt && timers [0]->at <= now)
266	{	546	{
267	struct ev_timer *w = timers [0];	547	struct ev_timer *w = timers [0];
268		548
269	/* first reschedule or stop timer */	549	/* first reschedule or stop timer */
270	if (w->repeat)	550	if (w->repeat)
271	{	551	{
272	if (w->is_abs)	552	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
273	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
274	else
275	w->at = now + w->repeat;	553	w->at = now + w->repeat;
276
277	assert (w->at > now);
278
279	downheap (timers, timercnt, 0);	554	downheap ((WT *)timers, timercnt, 0);
280	}	555	}
281	else	556	else
282	{
283	evtimer_stop (w); /* nonrepeating: stop timer */	557	ev_timer_stop (w); /* nonrepeating: stop timer */
284	--timercnt; /* maybe pass by reference instead? */	558
		559	event ((W)w, EV_TIMEOUT);
		560	}
		561	}
		562
		563	static void
		564	periodics_reify (void)
		565	{
		566	while (periodiccnt && periodics [0]->at <= ev_now)
		567	{
		568	struct ev_periodic *w = periodics [0];
		569
		570	/* first reschedule or stop timer */
		571	if (w->interval)
285	}	572	{
		573	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		574	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
		575	downheap ((WT *)periodics, periodiccnt, 0);
		576	}
		577	else
		578	ev_periodic_stop (w); /* nonrepeating: stop timer */
286		579
287	event ((struct ev_watcher *)w, EV_TIMEOUT);	580	event ((W)w, EV_PERIODIC);
288	}	581	}
289	}	582	}
290		583
291	static void	584	static void
292	time_update ()	585	periodics_reschedule (ev_tstamp diff)
293	{	586	{
294	int i;	587	int i;
		588
		589	/* adjust periodics after time jump */
		590	for (i = 0; i < periodiccnt; ++i)
		591	{
		592	struct ev_periodic *w = periodics [i];
		593
		594	if (w->interval)
		595	{
		596	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		597
		598	if (fabs (diff) >= 1e-4)
		599	{
		600	ev_periodic_stop (w);
		601	ev_periodic_start (w);
		602
		603	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		604	}
		605	}
		606	}
		607	}
		608
		609	static void
		610	time_update (void)
		611	{
		612	int i;
		613
295	ev_now = ev_time ();	614	ev_now = ev_time ();
296		615
297	if (have_monotonic)	616	if (have_monotonic)
298	{	617	{
299	ev_tstamp odiff = diff;	618	ev_tstamp odiff = diff;
300		619
301	/* detecting time jumps is much more difficult */
302	for (i = 2; --i; ) /* loop a few times, before making important decisions */	620	for (i = 4; --i; ) /* loop a few times, before making important decisions */
303	{	621	{
304	now = get_clock ();	622	now = get_clock ();
305	diff = ev_now - now;	623	diff = ev_now - now;
306		624
307	if (fabs (odiff - diff) < MIN_TIMEJUMP)	625	if (fabs (odiff - diff) < MIN_TIMEJUMP)
308	return; /* all is well */	626	return; /* all is well */
309		627
310	ev_now = ev_time ();	628	ev_now = ev_time ();
311	}	629	}
312		630
313	/* time jump detected, reschedule atimers */	631	periodics_reschedule (diff - odiff);
314	for (i = 0; i < atimercnt; ++i)	632	/* no timer adjustment, as the monotonic clock doesn't jump */
315	{
316	struct ev_timer *w = atimers [i];
317	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
318	}
319	}	633	}
320	else	634	else
321	{	635	{
322	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	636	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
323	/* time jump detected, adjust rtimers */	637	{
		638	periodics_reschedule (ev_now - now);
		639
		640	/* adjust timers. this is easy, as the offset is the same for all */
324	for (i = 0; i < rtimercnt; ++i)	641	for (i = 0; i < timercnt; ++i)
325	rtimers [i]->at += ev_now - now;	642	timers [i]->at += diff;
		643	}
326		644
327	now = ev_now;	645	now = ev_now;
328	}	646	}
329	}	647	}
330		648
331	int ev_loop_done;	649	int ev_loop_done;
332		650
333	void ev_loop (int flags)	651	void ev_loop (int flags)
334	{	652	{
335	double block;	653	double block;
336	ev_loop_done = flags & EVLOOP_ONESHOT;	654	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
337		655
338	do	656	do
339	{	657	{
		658	/* queue check watchers (and execute them) */
		659	if (preparecnt)
		660	{
		661	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		662	call_pending ();
		663	}
		664
340	/* update fd-related kernel structures */	665	/* update fd-related kernel structures */
341	method_reify (); fdchangecnt = 0;	666	fd_reify ();
342		667
343	/* calculate blocking time */	668	/* calculate blocking time */
		669
		670	/* we only need this for !monotonic clockor timers, but as we basically
		671	always have timers, we just calculate it always */
		672	ev_now = ev_time ();
		673
344	if (flags & EVLOOP_NONBLOCK)	674	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
345	block = 0.;	675	block = 0.;
346	else	676	else
347	{	677	{
348	block = MAX_BLOCKTIME;	678	block = MAX_BLOCKTIME;
349		679
350	if (rtimercnt)	680	if (timercnt)
351	{	681	{
352	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	682	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
353	if (block > to) block = to;	683	if (block > to) block = to;
354	}	684	}
355		685
356	if (atimercnt)	686	if (periodiccnt)
357	{	687	{
358	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	688	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
359	if (block > to) block = to;	689	if (block > to) block = to;
360	}	690	}
361		691
362	if (block < 0.) block = 0.;	692	if (block < 0.) block = 0.;
363	}	693	}
…		…
365	method_poll (block);	695	method_poll (block);
366		696
367	/* update ev_now, do magic */	697	/* update ev_now, do magic */
368	time_update ();	698	time_update ();
369		699
370	/* put pending timers into pendign queue and reschedule them */	700	/* queue pending timers and reschedule them */
371	/* absolute timers first */	701	timers_reify (); /* relative timers called last */
372	timers_reify (atimers, atimercnt, ev_now);	702	periodics_reify (); /* absolute timers called first */
373	/* relative timers second */	703
374	timers_reify (rtimers, rtimercnt, now);	704	/* queue idle watchers unless io or timers are pending */
		705	if (!pendingcnt)
		706	queue_events ((W *)idles, idlecnt, EV_IDLE);
		707
		708	/* queue check watchers, to be executed first */
		709	if (checkcnt)
		710	queue_events ((W *)checks, checkcnt, EV_CHECK);
375		711
376	call_pending ();	712	call_pending ();
377	}	713	}
378	while (!ev_loop_done);	714	while (!ev_loop_done);
379	}
380		715
		716	if (ev_loop_done != 2)
		717	ev_loop_done = 0;
		718	}
		719
		720	/*****************************************************************************/
		721
381	static void	722	static void
382	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	723	wlist_add (WL *head, WL elem)
383	{	724	{
384	elem->next = *head;	725	elem->next = *head;
385	*head = elem;	726	*head = elem;
386	}	727	}
387		728
388	static void	729	static void
389	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	730	wlist_del (WL *head, WL elem)
390	{	731	{
391	while (*head)	732	while (*head)
392	{	733	{
393	if (*head == elem)	734	if (*head == elem)
394	{	735	{
…		…
399	head = &(*head)->next;	740	head = &(*head)->next;
400	}	741	}
401	}	742	}
402		743
403	static void	744	static void
404	ev_start (struct ev_watcher *w, int active)	745	ev_clear_pending (W w)
405	{	746	{
		747	if (w->pending)
		748	{
		749	pendings [w->pending - 1].w = 0;
406	w->pending = 0;	750	w->pending = 0;
		751	}
		752	}
		753
		754	static void
		755	ev_start (W w, int active)
		756	{
407	w->active = active;	757	w->active = active;
408	}	758	}
409		759
410	static void	760	static void
411	ev_stop (struct ev_watcher *w)	761	ev_stop (W w)
412	{	762	{
413	if (w->pending)
414	pendings [w->pending - 1].w = 0;
415
416	w->active = 0;	763	w->active = 0;
417	/* nop */
418	}	764	}
419		765
		766	/*****************************************************************************/
		767
420	void	768	void
421	evio_start (struct ev_io *w)	769	ev_io_start (struct ev_io *w)
422	{	770	{
423	if (ev_is_active (w))
424	return;
425
426	int fd = w->fd;	771	int fd = w->fd;
427		772
428	ev_start ((struct ev_watcher *)w, 1);	773	if (ev_is_active (w))
		774	return;
		775
		776	assert (("ev_io_start called with negative fd", fd >= 0));
		777
		778	ev_start ((W)w, 1);
429	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	779	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
430	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	780	wlist_add ((WL *)&anfds[fd].head, (WL)w);
431		781
432	++fdchangecnt;	782	fd_change (fd);
433	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
434	fdchanges [fdchangecnt - 1] = fd;
435	}	783	}
436		784
437	void	785	void
438	evio_stop (struct ev_io *w)	786	ev_io_stop (struct ev_io *w)
439	{	787	{
		788	ev_clear_pending ((W)w);
440	if (!ev_is_active (w))	789	if (!ev_is_active (w))
441	return;	790	return;
442		791
443	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	792	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
444	ev_stop ((struct ev_watcher *)w);	793	ev_stop ((W)w);
445		794
446	++fdchangecnt;	795	fd_change (w->fd);
447	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
448	fdchanges [fdchangecnt - 1] = w->fd;
449	}	796	}
450		797
451	void	798	void
452	evtimer_start (struct ev_timer *w)	799	ev_timer_start (struct ev_timer *w)
453	{	800	{
		801	if (ev_is_active (w))
		802	return;
		803
		804	w->at += now;
		805
		806	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		807
		808	ev_start ((W)w, ++timercnt);
		809	array_needsize (timers, timermax, timercnt, );
		810	timers [timercnt - 1] = w;
		811	upheap ((WT *)timers, timercnt - 1);
		812	}
		813
		814	void
		815	ev_timer_stop (struct ev_timer *w)
		816	{
		817	ev_clear_pending ((W)w);
454	if (ev_is_active (w))	818	if (!ev_is_active (w))
455	return;	819	return;
456		820
457	if (w->is_abs)	821	if (w->active < timercnt--)
		822	{
		823	timers [w->active - 1] = timers [timercnt];
		824	downheap ((WT *)timers, timercnt, w->active - 1);
458	{	825	}
459	/* this formula differs from the one in timer_reify becuse we do not round up */	826
		827	w->at = w->repeat;
		828
		829	ev_stop ((W)w);
		830	}
		831
		832	void
		833	ev_timer_again (struct ev_timer *w)
		834	{
		835	if (ev_is_active (w))
		836	{
460	if (w->repeat)	837	if (w->repeat)
		838	{
		839	w->at = now + w->repeat;
		840	downheap ((WT *)timers, timercnt, w->active - 1);
		841	}
		842	else
		843	ev_timer_stop (w);
		844	}
		845	else if (w->repeat)
		846	ev_timer_start (w);
		847	}
		848
		849	void
		850	ev_periodic_start (struct ev_periodic *w)
		851	{
		852	if (ev_is_active (w))
		853	return;
		854
		855	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		856
		857	/* this formula differs from the one in periodic_reify because we do not always round up */
		858	if (w->interval)
461	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	859	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
462		860
463	ev_start ((struct ev_watcher *)w, ++atimercnt);	861	ev_start ((W)w, ++periodiccnt);
464	array_needsize (atimers, atimermax, atimercnt, );	862	array_needsize (periodics, periodicmax, periodiccnt, );
465	atimers [atimercnt - 1] = w;	863	periodics [periodiccnt - 1] = w;
466	upheap (atimers, atimercnt - 1);	864	upheap ((WT *)periodics, periodiccnt - 1);
		865	}
		866
		867	void
		868	ev_periodic_stop (struct ev_periodic *w)
		869	{
		870	ev_clear_pending ((W)w);
		871	if (!ev_is_active (w))
		872	return;
		873
		874	if (w->active < periodiccnt--)
467	}	875	{
		876	periodics [w->active - 1] = periodics [periodiccnt];
		877	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		878	}
		879
		880	ev_stop ((W)w);
		881	}
		882
		883	void
		884	ev_signal_start (struct ev_signal *w)
		885	{
		886	if (ev_is_active (w))
		887	return;
		888
		889	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		890
		891	ev_start ((W)w, 1);
		892	array_needsize (signals, signalmax, w->signum, signals_init);
		893	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		894
		895	if (!w->next)
		896	{
		897	struct sigaction sa;
		898	sa.sa_handler = sighandler;
		899	sigfillset (&sa.sa_mask);
		900	sa.sa_flags = 0;
		901	sigaction (w->signum, &sa, 0);
		902	}
		903	}
		904
		905	void
		906	ev_signal_stop (struct ev_signal *w)
		907	{
		908	ev_clear_pending ((W)w);
		909	if (!ev_is_active (w))
		910	return;
		911
		912	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		913	ev_stop ((W)w);
		914
		915	if (!signals [w->signum - 1].head)
		916	signal (w->signum, SIG_DFL);
		917	}
		918
		919	void
		920	ev_idle_start (struct ev_idle *w)
		921	{
		922	if (ev_is_active (w))
		923	return;
		924
		925	ev_start ((W)w, ++idlecnt);
		926	array_needsize (idles, idlemax, idlecnt, );
		927	idles [idlecnt - 1] = w;
		928	}
		929
		930	void
		931	ev_idle_stop (struct ev_idle *w)
		932	{
		933	ev_clear_pending ((W)w);
		934	if (ev_is_active (w))
		935	return;
		936
		937	idles [w->active - 1] = idles [--idlecnt];
		938	ev_stop ((W)w);
		939	}
		940
		941	void
		942	ev_prepare_start (struct ev_prepare *w)
		943	{
		944	if (ev_is_active (w))
		945	return;
		946
		947	ev_start ((W)w, ++preparecnt);
		948	array_needsize (prepares, preparemax, preparecnt, );
		949	prepares [preparecnt - 1] = w;
		950	}
		951
		952	void
		953	ev_prepare_stop (struct ev_prepare *w)
		954	{
		955	ev_clear_pending ((W)w);
		956	if (ev_is_active (w))
		957	return;
		958
		959	prepares [w->active - 1] = prepares [--preparecnt];
		960	ev_stop ((W)w);
		961	}
		962
		963	void
		964	ev_check_start (struct ev_check *w)
		965	{
		966	if (ev_is_active (w))
		967	return;
		968
		969	ev_start ((W)w, ++checkcnt);
		970	array_needsize (checks, checkmax, checkcnt, );
		971	checks [checkcnt - 1] = w;
		972	}
		973
		974	void
		975	ev_check_stop (struct ev_check *w)
		976	{
		977	ev_clear_pending ((W)w);
		978	if (ev_is_active (w))
		979	return;
		980
		981	checks [w->active - 1] = checks [--checkcnt];
		982	ev_stop ((W)w);
		983	}
		984
		985	void
		986	ev_child_start (struct ev_child *w)
		987	{
		988	if (ev_is_active (w))
		989	return;
		990
		991	ev_start ((W)w, 1);
		992	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		993	}
		994
		995	void
		996	ev_child_stop (struct ev_child *w)
		997	{
		998	ev_clear_pending ((W)w);
		999	if (ev_is_active (w))
		1000	return;
		1001
		1002	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1003	ev_stop ((W)w);
		1004	}
		1005
		1006	/*****************************************************************************/
		1007
		1008	struct ev_once
		1009	{
		1010	struct ev_io io;
		1011	struct ev_timer to;
		1012	void (cb)(int revents, void arg);
		1013	void *arg;
		1014	};
		1015
		1016	static void
		1017	once_cb (struct ev_once *once, int revents)
		1018	{
		1019	void (cb)(int revents, void arg) = once->cb;
		1020	void *arg = once->arg;
		1021
		1022	ev_io_stop (&once->io);
		1023	ev_timer_stop (&once->to);
		1024	free (once);
		1025
		1026	cb (revents, arg);
		1027	}
		1028
		1029	static void
		1030	once_cb_io (struct ev_io *w, int revents)
		1031	{
		1032	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1033	}
		1034
		1035	static void
		1036	once_cb_to (struct ev_timer *w, int revents)
		1037	{
		1038	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1039	}
		1040
		1041	void
		1042	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1043	{
		1044	struct ev_once *once = malloc (sizeof (struct ev_once));
		1045
		1046	if (!once)
		1047	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
468	else	1048	else
469	{	1049	{
470	w->at += now;	1050	once->cb = cb;
		1051	once->arg = arg;
471		1052
472	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1053	ev_watcher_init (&once->io, once_cb_io);
473	array_needsize (rtimers, rtimermax, rtimercnt, );	1054	if (fd >= 0)
474	rtimers [rtimercnt - 1] = w;
475	upheap (rtimers, rtimercnt - 1);
476	}
477
478	}
479
480	void
481	evtimer_stop (struct ev_timer *w)
482	{
483	if (!ev_is_active (w))
484	return;
485
486	if (w->is_abs)
487	{
488	if (w->active < atimercnt--)
489	{
490	atimers [w->active - 1] = atimers [atimercnt];
491	downheap (atimers, atimercnt, w->active - 1);
492	}	1055	{
493	}	1056	ev_io_set (&once->io, fd, events);
494	else	1057	ev_io_start (&once->io);
495	{
496	if (w->active < rtimercnt--)
497	{	1058	}
498	rtimers [w->active - 1] = rtimers [rtimercnt];	1059
499	downheap (rtimers, rtimercnt, w->active - 1);	1060	ev_watcher_init (&once->to, once_cb_to);
		1061	if (timeout >= 0.)
500	}	1062	{
		1063	ev_timer_set (&once->to, timeout, 0.);
		1064	ev_timer_start (&once->to);
		1065	}
501	}	1066	}
502
503	ev_stop ((struct ev_watcher *)w);
504	}	1067	}
505		1068
506	void
507	evsignal_start (struct ev_signal *w)
508	{
509	if (ev_is_active (w))
510	return;
511
512	ev_start ((struct ev_watcher *)w, 1);
513	array_needsize (signals, signalmax, w->signum, signals_init);
514	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
515	}
516
517	void
518	evsignal_stop (struct ev_signal *w)
519	{
520	if (!ev_is_active (w))
521	return;
522
523	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
524	ev_stop ((struct ev_watcher *)w);
525	}
526
527	/*****************************************************************************/	1069	/*****************************************************************************/
		1070
528	#if 1	1071	#if 0
		1072
		1073	struct ev_io wio;
529		1074
530	static void	1075	static void
531	sin_cb (struct ev_io *w, int revents)	1076	sin_cb (struct ev_io *w, int revents)
532	{	1077	{
533	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1078	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
535		1080
536	static void	1081	static void
537	ocb (struct ev_timer *w, int revents)	1082	ocb (struct ev_timer *w, int revents)
538	{	1083	{
539	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1084	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
540	evtimer_stop (w);	1085	ev_timer_stop (w);
541	evtimer_start (w);	1086	ev_timer_start (w);
		1087	}
		1088
		1089	static void
		1090	scb (struct ev_signal *w, int revents)
		1091	{
		1092	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1093	ev_io_stop (&wio);
		1094	ev_io_start (&wio);
		1095	}
		1096
		1097	static void
		1098	gcb (struct ev_signal *w, int revents)
		1099	{
		1100	fprintf (stderr, "generic %x\n", revents);
		1101
542	}	1102	}
543		1103
544	int main (void)	1104	int main (void)
545	{	1105	{
546	struct ev_io sin;
547
548	ev_init (0);	1106	ev_init (0);
549		1107
550	evw_init (&sin, sin_cb, 55);
551	evio_set (&sin, 0, EV_READ);	1108	ev_io_init (&wio, sin_cb, 0, EV_READ);
552	evio_start (&sin);	1109	ev_io_start (&wio);
553		1110
554	struct ev_timer t[10000];	1111	struct ev_timer t[10000];
555		1112
556	#if 1	1113	#if 0
557	int i;	1114	int i;
558	for (i = 0; i < 10000; ++i)	1115	for (i = 0; i < 10000; ++i)
559	{	1116	{
560	struct ev_timer *w = t + i;	1117	struct ev_timer *w = t + i;
561	evw_init (w, ocb, i);	1118	ev_watcher_init (w, ocb, i);
562	evtimer_set_abs (w, drand48 (), 0.99775533);	1119	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
563	evtimer_start (w);	1120	ev_timer_start (w);
564	if (drand48 () < 0.5)	1121	if (drand48 () < 0.5)
565	evtimer_stop (w);	1122	ev_timer_stop (w);
566	}	1123	}
567	#endif	1124	#endif
568		1125
569	struct ev_timer t1;	1126	struct ev_timer t1;
570	evw_init (&t1, ocb, 0);	1127	ev_timer_init (&t1, ocb, 5, 10);
571	evtimer_set_abs (&t1, 5, 10);
572	evtimer_start (&t1);	1128	ev_timer_start (&t1);
		1129
		1130	struct ev_signal sig;
		1131	ev_signal_init (&sig, scb, SIGQUIT);
		1132	ev_signal_start (&sig);
		1133
		1134	struct ev_check cw;
		1135	ev_check_init (&cw, gcb);
		1136	ev_check_start (&cw);
		1137
		1138	struct ev_idle iw;
		1139	ev_idle_init (&iw, gcb);
		1140	ev_idle_start (&iw);
573		1141
574	ev_loop (0);	1142	ev_loop (0);
575		1143
576	return 0;	1144	return 0;
577	}	1145	}

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing libev/ev.c (file contents): Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs. Revision 1.38 by root, Thu Nov 1 15:21:13 2007 UTC

Diff Legend

Comparing libev/ev.c (file contents):
Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.38 by root, Thu Nov 1 15:21:13 2007 UTC