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

Comparing libev/ev.c (file contents):
Revision 1.1 by root, Tue Oct 30 20:59:31 2007 UTC vs.
Revision 1.31 by root, Thu Nov 1 09:05:33 2007 UTC

…		…
		1	/*
		2	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions are
		7	* met:
		8	*
		9	* * Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	*
		12	* * Redistributions in binary form must reproduce the above
		13	* copyright notice, this list of conditions and the following
		14	* disclaimer in the documentation and/or other materials provided
		15	* with the distribution.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		18	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		19	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		20	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		21	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		22	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		23	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		27	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		28	*/
		29	#if EV_USE_CONFIG_H
		30	# include "config.h"
		31	#endif
		32
1	#include <math.h>	33	#include <math.h>
2	#include <stdlib.h>	34	#include <stdlib.h>
		35	#include <unistd.h>
		36	#include <fcntl.h>
		37	#include <signal.h>
		38	#include <stddef.h>
3		39
4	#include <stdio.h>	40	#include <stdio.h>
5		41
		42	#include <assert.h>
6	#include <errno.h>	43	#include <errno.h>
		44	#include <sys/types.h>
		45	#include <sys/wait.h>
7	#include <sys/time.h>	46	#include <sys/time.h>
8	#include <time.h>	47	#include <time.h>
9		48
		49	#ifndef EV_USE_MONOTONIC
10	#ifdef CLOCK_MONOTONIC	50	# ifdef CLOCK_MONOTONIC
11	# define HAVE_MONOTONIC 1	51	# define EV_USE_MONOTONIC 1
12	#endif	52	# endif
		53	#endif
13		54
		55	#ifndef EV_USE_SELECT
		56	# define EV_USE_SELECT 1
		57	#endif
		58
		59	#ifndef EV_USE_EPOLL
14	#define HAVE_EPOLL 1	60	# define EV_USE_EPOLL 0
		61	#endif
		62
		63	#ifndef CLOCK_REALTIME
15	#define HAVE_REALTIME 1	64	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	65	#endif
		66	#ifndef EV_USE_REALTIME
		67	# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */
		68	#endif
17		69
18	#define MAX_BLOCKTIME 60.	70	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		71	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detetc time jumps) */
		72	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		73	#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
19		74
20	#include "ev.h"	75	#include "ev.h"
21		76
22	struct ev_watcher {	77	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	78	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	79	typedef struct ev_watcher_time *WT;
28	};
29		80
		81	static ev_tstamp now, diff; /* monotonic clock */
30	ev_tstamp ev_now;	82	ev_tstamp ev_now;
31	int ev_method;	83	int ev_method;
32		84
33	static int have_monotonic; /* runtime */	85	static int have_monotonic; /* runtime */
34		86
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	87	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
36	static void (*method_reify)(void);	88	static void (*method_modify)(int fd, int oev, int nev);
37	static void (*method_poll)(ev_tstamp timeout);	89	static void (*method_poll)(ev_tstamp timeout);
		90
		91	/*****************************************************************************/
38		92
39	ev_tstamp	93	ev_tstamp
40	ev_time (void)	94	ev_time (void)
41	{	95	{
42	#if HAVE_REALTIME	96	#if EV_USE_REALTIME
43	struct timespec ts;	97	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	98	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	99	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	100	#else
47	struct timeval tv;	101	struct timeval tv;
51	}	105	}
52		106
53	static ev_tstamp	107	static ev_tstamp
54	get_clock (void)	108	get_clock (void)
55	{	109	{
56	#if HAVE_MONOTONIC	110	#if EV_USE_MONOTONIC
57	if (have_monotonic)	111	if (have_monotonic)
58	{	112	{
59	struct timespec ts;	113	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	114	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	115	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	116	}
63	#endif	117	#endif
64		118
65	return ev_time ();	119	return ev_time ();
66	}	120	}
		121
		122	#define array_roundsize(base,n) ((n) \| 4 & ~3)
67		123
68	#define array_needsize(base,cur,cnt,init) \	124	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	125	if ((cnt) > cur) \
70	{ \	126	{ \
71	int newcnt = cur; \	127	int newcnt = cur; \
72	do \	128	do \
73	{ \	129	{ \
74	newcnt += (newcnt >> 1) + 16; \	130	newcnt = array_roundsize (base, newcnt << 1); \
75	} \	131	} \
76	while ((cnt) > newcnt); \	132	while ((cnt) > newcnt); \
77	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	133	\
78	base = realloc (base, sizeof (base) (newcnt)); \	134	base = realloc (base, sizeof (base) (newcnt)); \
79	init (base + cur, newcnt - cur); \	135	init (base + cur, newcnt - cur); \
80	cur = newcnt; \	136	cur = newcnt; \
81	}	137	}
82		138
		139	/*****************************************************************************/
		140
83	typedef struct	141	typedef struct
84	{	142	{
85	struct ev_io *head;	143	struct ev_io *head;
86	unsigned char wev, rev; /* want, received event set */	144	int events;
87	} ANFD;	145	} ANFD;
88		146
89	static ANFD *anfds;	147	static ANFD *anfds;
90	static int anfdmax;	148	static int anfdmax;
91		149
92	static int *fdchanges;
93	static int fdchangemax, fdchangecnt;
94
95	static void	150	static void
96	anfds_init (ANFD *base, int count)	151	anfds_init (ANFD *base, int count)
97	{	152	{
98	while (count--)	153	while (count--)
99	{	154	{
100	base->head = 0;	155	base->head = 0;
101	base->wev = base->rev = EV_NONE;	156	base->events = EV_NONE;
102	++base;	157	++base;
103	}	158	}
104	}	159	}
105		160
106	typedef struct	161	typedef struct
107	{	162	{
108	struct ev_watcher *w;	163	W w;
109	int events;	164	int events;
110	} ANPENDING;	165	} ANPENDING;
111		166
112	static ANPENDING *pendings;	167	static ANPENDING *pendings;
113	static int pendingmax, pendingcnt;	168	static int pendingmax, pendingcnt;
114		169
115	static void	170	static void
116	event (struct ev_watcher *w, int events)	171	event (W w, int events)
117	{	172	{
118	w->pending = ++pendingcnt;	173	w->pending = ++pendingcnt;
119	array_needsize (pendings, pendingmax, pendingcnt, );	174	array_needsize (pendings, pendingmax, pendingcnt, );
120	pendings [pendingcnt - 1].w = w;	175	pendings [pendingcnt - 1].w = w;
121	pendings [pendingcnt - 1].events = events;	176	pendings [pendingcnt - 1].events = events;
122	}	177	}
123		178
124	static void	179	static void
		180	queue_events (W *events, int eventcnt, int type)
		181	{
		182	int i;
		183
		184	for (i = 0; i < eventcnt; ++i)
		185	event (events [i], type);
		186	}
		187
		188	static void
125	fd_event (int fd, int events)	189	fd_event (int fd, int events)
126	{	190	{
127	ANFD *anfd = anfds + fd;	191	ANFD *anfd = anfds + fd;
128	struct ev_io *w;	192	struct ev_io *w;
129		193
130	for (w = anfd->head; w; w = w->next)	194	for (w = anfd->head; w; w = w->next)
131	{	195	{
132	int ev = w->events & events;	196	int ev = w->events & events;
133		197
134	if (ev)	198	if (ev)
135	event ((struct ev_watcher *)w, ev);	199	event ((W)w, ev);
		200	}
		201	}
		202
		203	/*****************************************************************************/
		204
		205	static int *fdchanges;
		206	static int fdchangemax, fdchangecnt;
		207
		208	static void
		209	fd_reify (void)
		210	{
		211	int i;
		212
		213	for (i = 0; i < fdchangecnt; ++i)
136	}	214	{
		215	int fd = fdchanges [i];
		216	ANFD *anfd = anfds + fd;
		217	struct ev_io *w;
		218
		219	int events = 0;
		220
		221	for (w = anfd->head; w; w = w->next)
		222	events \|= w->events;
		223
		224	anfd->events &= ~EV_REIFY;
		225
		226	if (anfd->events != events)
		227	{
		228	method_modify (fd, anfd->events, events);
		229	anfd->events = events;
		230	}
		231	}
		232
		233	fdchangecnt = 0;
137	}	234	}
		235
		236	static void
		237	fd_change (int fd)
		238	{
		239	if (anfds [fd].events & EV_REIFY \|\| fdchangecnt < 0)
		240	return;
		241
		242	anfds [fd].events \|= EV_REIFY;
		243
		244	++fdchangecnt;
		245	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		246	fdchanges [fdchangecnt - 1] = fd;
		247	}
		248
		249	/* called on EBADF to verify fds */
		250	static void
		251	fd_recheck (void)
		252	{
		253	int fd;
		254
		255	for (fd = 0; fd < anfdmax; ++fd)
		256	if (anfds [fd].events)
		257	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		258	while (anfds [fd].head)
		259	{
		260	event ((W)anfds [fd].head, EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT);
		261	ev_io_stop (anfds [fd].head);
		262	}
		263	}
		264
		265	/*****************************************************************************/
138		266
139	static struct ev_timer **timers;	267	static struct ev_timer **timers;
140	static int timermax, timercnt;	268	static int timermax, timercnt;
141		269
		270	static struct ev_periodic **periodics;
		271	static int periodicmax, periodiccnt;
		272
142	static void	273	static void
143	upheap (int k)	274	upheap (WT *timers, int k)
144	{	275	{
145	struct ev_timer *w = timers [k];	276	WT w = timers [k];
146		277
147	while (k && timers [k >> 1]->at > w->at)	278	while (k && timers [k >> 1]->at > w->at)
148	{	279	{
149	timers [k] = timers [k >> 1];	280	timers [k] = timers [k >> 1];
150	timers [k]->active = k + 1;	281	timers [k]->active = k + 1;
…		…
155	timers [k]->active = k + 1;	286	timers [k]->active = k + 1;
156		287
157	}	288	}
158		289
159	static void	290	static void
160	downheap (int k)	291	downheap (WT *timers, int N, int k)
161	{	292	{
162	struct ev_timer *w = timers [k];	293	WT w = timers [k];
163		294
164	while (k <= (timercnt >> 1))	295	while (k < (N >> 1))
165	{	296	{
166	int j = k << 1;	297	int j = k << 1;
167		298
168	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	299	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
169	++j;	300	++j;
170		301
171	if (w->at <= timers [j]->at)	302	if (w->at <= timers [j]->at)
172	break;	303	break;
173		304
174	timers [k] = timers [j];	305	timers [k] = timers [j];
175	timers [k]->active = k;	306	timers [k]->active = k + 1;
176	k = j;	307	k = j;
177	}	308	}
178		309
179	timers [k] = w;	310	timers [k] = w;
180	timers [k]->active = k + 1;	311	timers [k]->active = k + 1;
181	}	312	}
182		313
183	static struct ev_signal **signals;	314	/*****************************************************************************/
		315
		316	typedef struct
		317	{
		318	struct ev_signal *head;
		319	sig_atomic_t gotsig;
		320	} ANSIG;
		321
		322	static ANSIG *signals;
184	static int signalmax, signalcnt;	323	static int signalmax;
185		324
		325	static int sigpipe [2];
		326	static sig_atomic_t gotsig;
		327	static struct ev_io sigev;
		328
186	static void	329	static void
187	signals_init (struct ev_signal **base, int count)	330	signals_init (ANSIG *base, int count)
188	{	331	{
189	while (count--)	332	while (count--)
190	*base++ = 0;	333	{
		334	base->head = 0;
		335	base->gotsig = 0;
		336	++base;
		337	}
191	}	338	}
192		339
		340	static void
		341	sighandler (int signum)
		342	{
		343	signals [signum - 1].gotsig = 1;
		344
		345	if (!gotsig)
		346	{
		347	gotsig = 1;
		348	write (sigpipe [1], &gotsig, 1);
		349	}
		350	}
		351
		352	static void
		353	sigcb (struct ev_io *iow, int revents)
		354	{
		355	struct ev_signal *w;
		356	int sig;
		357
		358	gotsig = 0;
		359	read (sigpipe [0], &revents, 1);
		360
		361	for (sig = signalmax; sig--; )
		362	if (signals [sig].gotsig)
		363	{
		364	signals [sig].gotsig = 0;
		365
		366	for (w = signals [sig].head; w; w = w->next)
		367	event ((W)w, EV_SIGNAL);
		368	}
		369	}
		370
		371	static void
		372	siginit (void)
		373	{
		374	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		375	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		376
		377	/* rather than sort out wether we really need nb, set it */
		378	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		379	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		380
		381	ev_io_set (&sigev, sigpipe [0], EV_READ);
		382	ev_io_start (&sigev);
		383	}
		384
		385	/*****************************************************************************/
		386
		387	static struct ev_idle **idles;
		388	static int idlemax, idlecnt;
		389
		390	static struct ev_prepare **prepares;
		391	static int preparemax, preparecnt;
		392
		393	static struct ev_check **checks;
		394	static int checkmax, checkcnt;
		395
		396	/*****************************************************************************/
		397
		398	static struct ev_child *childs [PID_HASHSIZE];
		399	static struct ev_signal childev;
		400
		401	#ifndef WCONTINUED
		402	# define WCONTINUED 0
		403	#endif
		404
		405	static void
		406	childcb (struct ev_signal *sw, int revents)
		407	{
		408	struct ev_child *w;
		409	int pid, status;
		410
		411	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		412	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		413	if (w->pid == pid \|\| w->pid == -1)
		414	{
		415	w->status = status;
		416	event ((W)w, EV_CHILD);
		417	}
		418	}
		419
		420	/*****************************************************************************/
		421
193	#if HAVE_EPOLL	422	#if EV_USE_EPOLL
194	# include "ev_epoll.c"	423	# include "ev_epoll.c"
195	#endif	424	#endif
196	#if HAVE_SELECT	425	#if EV_USE_SELECT
197	# include "ev_select.c"	426	# include "ev_select.c"
198	#endif	427	#endif
199		428
		429	int
		430	ev_version_major (void)
		431	{
		432	return EV_VERSION_MAJOR;
		433	}
		434
		435	int
		436	ev_version_minor (void)
		437	{
		438	return EV_VERSION_MINOR;
		439	}
		440
200	int ev_init (int flags)	441	int ev_init (int flags)
201	{	442	{
		443	if (!ev_method)
		444	{
202	#if HAVE_MONOTONIC	445	#if EV_USE_MONOTONIC
203	{	446	{
204	struct timespec ts;	447	struct timespec ts;
205	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	448	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
206	have_monotonic = 1;	449	have_monotonic = 1;
207	}	450	}
208	#endif	451	#endif
209		452
210	ev_now = ev_time ();	453	ev_now = ev_time ();
		454	now = get_clock ();
		455	diff = ev_now - now;
211		456
212	#if HAVE_EPOLL	457	if (pipe (sigpipe))
213	if (epoll_init (flags))	458	return 0;
214	return ev_method;
215	#endif
216	#if HAVE_SELECT
217	if (select_init (flags))
218	return ev_method;
219	#endif
220		459
221	ev_method = EVMETHOD_NONE;	460	ev_method = EVMETHOD_NONE;
		461	#if EV_USE_EPOLL
		462	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
		463	#endif
		464	#if EV_USE_SELECT
		465	if (ev_method == EVMETHOD_NONE) select_init (flags);
		466	#endif
		467
		468	if (ev_method)
		469	{
		470	ev_watcher_init (&sigev, sigcb);
		471	siginit ();
		472
		473	ev_signal_init (&childev, childcb, SIGCHLD);
		474	ev_signal_start (&childev);
		475	}
		476	}
		477
222	return ev_method;	478	return ev_method;
223	}	479	}
224		480
		481	/*****************************************************************************/
		482
		483	void
225	void ev_prefork (void)	484	ev_prefork (void)
226	{	485	{
		486	/* nop */
227	}	487	}
228		488
		489	void
229	void ev_postfork_parent (void)	490	ev_postfork_parent (void)
230	{	491	{
		492	/* nop */
231	}	493	}
232		494
		495	void
233	void ev_postfork_child (void)	496	ev_postfork_child (void)
234	{	497	{
235	#if HAVE_EPOLL	498	#if EV_USE_EPOLL
		499	if (ev_method == EVMETHOD_EPOLL)
236	epoll_postfork_child ();	500	epoll_postfork_child ();
237	#endif	501	#endif
238	}
239		502
		503	ev_io_stop (&sigev);
		504	close (sigpipe [0]);
		505	close (sigpipe [1]);
		506	pipe (sigpipe);
		507	siginit ();
		508	}
		509
		510	/*****************************************************************************/
		511
240	static void	512	static void
241	call_pending ()	513	call_pending (void)
242	{	514	{
243	int i;	515	while (pendingcnt)
244
245	for (i = 0; i < pendingcnt; ++i)
246	{	516	{
247	ANPENDING *p = pendings + i;	517	ANPENDING *p = pendings + --pendingcnt;
248		518
249	if (p->w)	519	if (p->w)
250	{	520	{
251	p->w->pending = 0;	521	p->w->pending = 0;
252	p->w->cb (p->w, p->events);	522	p->w->cb (p->w, p->events);
253	}	523	}
254	}	524	}
255
256	pendingcnt = 0;
257	}	525	}
258		526
259	static void	527	static void
260	timer_reify (void)	528	timers_reify (void)
261	{	529	{
262	while (timercnt && timers [0]->at <= ev_now)	530	while (timercnt && timers [0]->at <= now)
263	{	531	{
264	struct ev_timer *w = timers [0];	532	struct ev_timer *w = timers [0];
265		533
266	/* first reschedule timer */	534	/* first reschedule or stop timer */
267	if (w->repeat)	535	if (w->repeat)
268	{	536	{
269	fprintf (stderr, "a %f now %f repeat %f, %f\n", w->at, ev_now, w->repeat, w->repeat *1e30);//D
270	if (w->is_abs)
271	w->at += floor ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
272	else
273	w->at = ev_now + w->repeat;	537	w->at = now + w->repeat;
274		538	assert (("timer timeout in the past, negative repeat?", w->at > now));
275	fprintf (stderr, "b %f\n", w->at);//D	539	downheap ((WT *)timers, timercnt, 0);
276
277	downheap (0);
278	}	540	}
279	else	541	else
280	evtimer_stop (w); /* nonrepeating: stop timer */	542	ev_timer_stop (w); /* nonrepeating: stop timer */
281		543
282	event ((struct ev_watcher *)w, EV_TIMEOUT);	544	event ((W)w, EV_TIMEOUT);
		545	}
		546	}
		547
		548	static void
		549	periodics_reify (void)
		550	{
		551	while (periodiccnt && periodics [0]->at <= ev_now)
		552	{
		553	struct ev_periodic *w = periodics [0];
		554
		555	/* first reschedule or stop timer */
		556	if (w->interval)
		557	{
		558	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		559	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
		560	downheap ((WT *)periodics, periodiccnt, 0);
		561	}
		562	else
		563	ev_periodic_stop (w); /* nonrepeating: stop timer */
		564
		565	event ((W)w, EV_TIMEOUT);
		566	}
		567	}
		568
		569	static void
		570	periodics_reschedule (ev_tstamp diff)
		571	{
		572	int i;
		573
		574	/* adjust periodics after time jump */
		575	for (i = 0; i < periodiccnt; ++i)
		576	{
		577	struct ev_periodic *w = periodics [i];
		578
		579	if (w->interval)
		580	{
		581	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		582
		583	if (fabs (diff) >= 1e-4)
		584	{
		585	ev_periodic_stop (w);
		586	ev_periodic_start (w);
		587
		588	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		589	}
		590	}
		591	}
		592	}
		593
		594	static void
		595	time_update (void)
		596	{
		597	int i;
		598
		599	ev_now = ev_time ();
		600
		601	if (have_monotonic)
		602	{
		603	ev_tstamp odiff = diff;
		604
		605	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		606	{
		607	now = get_clock ();
		608	diff = ev_now - now;
		609
		610	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		611	return; /* all is well */
		612
		613	ev_now = ev_time ();
		614	}
		615
		616	periodics_reschedule (diff - odiff);
		617	/* no timer adjustment, as the monotonic clock doesn't jump */
		618	}
		619	else
		620	{
		621	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
		622	{
		623	periodics_reschedule (ev_now - now);
		624
		625	/* adjust timers. this is easy, as the offset is the same for all */
		626	for (i = 0; i < timercnt; ++i)
		627	timers [i]->at += diff;
		628	}
		629
		630	now = ev_now;
283	}	631	}
284	}	632	}
285		633
286	int ev_loop_done;	634	int ev_loop_done;
287		635
288	int ev_loop (int flags)	636	void ev_loop (int flags)
289	{	637	{
290	double block;	638	double block;
291	ev_loop_done = flags & EVLOOP_ONESHOT;	639	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
292		640
293	do	641	do
294	{	642	{
		643	/* queue check watchers (and execute them) */
		644	if (preparecnt)
		645	{
		646	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		647	call_pending ();
		648	}
		649
295	/* update fd-related kernel structures */	650	/* update fd-related kernel structures */
296	method_reify (); fdchangecnt = 0;	651	fd_reify ();
297		652
298	/* calculate blocking time */	653	/* calculate blocking time */
		654
		655	/* we only need this for !monotonic clockor timers, but as we basically
		656	always have timers, we just calculate it always */
299	ev_now = ev_time ();	657	ev_now = ev_time ();
300		658
301	if (flags & EVLOOP_NONBLOCK)	659	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
302	block = 0.;	660	block = 0.;
303	else if (!timercnt)
304	block = MAX_BLOCKTIME;
305	else	661	else
306	{	662	{
		663	block = MAX_BLOCKTIME;
		664
		665	if (timercnt)
		666	{
		667	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
		668	if (block > to) block = to;
		669	}
		670
		671	if (periodiccnt)
		672	{
307	block = timers [0]->at - ev_now + method_fudge;	673	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
		674	if (block > to) block = to;
		675	}
		676
308	if (block < 0.) block = 0.;	677	if (block < 0.) block = 0.;
309	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
310	}	678	}
311		679
312	fprintf (stderr, "block %f\n", block);//D
313	method_poll (block);	680	method_poll (block);
314		681
		682	/* update ev_now, do magic */
		683	time_update ();
		684
315	/* put pending timers into pendign queue and reschedule them */	685	/* queue pending timers and reschedule them */
316	timer_reify ();	686	timers_reify (); /* relative timers called last */
		687	periodics_reify (); /* absolute timers called first */
317		688
318	ev_now = ev_time ();	689	/* queue idle watchers unless io or timers are pending */
		690	if (!pendingcnt)
		691	queue_events ((W *)idles, idlecnt, EV_IDLE);
		692
		693	/* queue check watchers, to be executed first */
		694	if (checkcnt)
		695	queue_events ((W *)checks, checkcnt, EV_CHECK);
		696
319	call_pending ();	697	call_pending ();
320	}	698	}
321	while (!ev_loop_done);	699	while (!ev_loop_done);
322	}
323		700
		701	if (ev_loop_done != 2)
		702	ev_loop_done = 0;
		703	}
		704
		705	/*****************************************************************************/
		706
324	static void	707	static void
325	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	708	wlist_add (WL *head, WL elem)
326	{	709	{
327	elem->next = *head;	710	elem->next = *head;
328	*head = elem;	711	*head = elem;
329	}	712	}
330		713
331	static void	714	static void
332	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	715	wlist_del (WL *head, WL elem)
333	{	716	{
334	while (*head)	717	while (*head)
335	{	718	{
336	if (*head == elem)	719	if (*head == elem)
337	{	720	{
…		…
342	head = &(*head)->next;	725	head = &(*head)->next;
343	}	726	}
344	}	727	}
345		728
346	static void	729	static void
347	ev_start (struct ev_watcher *w, int active)	730	ev_clear (W w)
348	{	731	{
		732	if (w->pending)
		733	{
		734	pendings [w->pending - 1].w = 0;
349	w->pending = 0;	735	w->pending = 0;
		736	}
		737	}
		738
		739	static void
		740	ev_start (W w, int active)
		741	{
350	w->active = active;	742	w->active = active;
351	}	743	}
352		744
353	static void	745	static void
354	ev_stop (struct ev_watcher *w)	746	ev_stop (W w)
355	{	747	{
356	if (w->pending)
357	pendings [w->pending - 1].w = 0;
358
359	w->active = 0;	748	w->active = 0;
360	/* nop */
361	}	749	}
362		750
		751	/*****************************************************************************/
		752
363	void	753	void
364	evio_start (struct ev_io *w)	754	ev_io_start (struct ev_io *w)
365	{	755	{
366	if (ev_is_active (w))	756	if (ev_is_active (w))
367	return;	757	return;
368		758
369	int fd = w->fd;	759	int fd = w->fd;
370		760
371	ev_start ((struct ev_watcher *)w, 1);	761	ev_start ((W)w, 1);
372	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	762	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
373	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	763	wlist_add ((WL *)&anfds[fd].head, (WL)w);
374		764
375	++fdchangecnt;	765	fd_change (fd);
376	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
377	fdchanges [fdchangecnt - 1] = fd;
378	}	766	}
379		767
380	void	768	void
381	evio_stop (struct ev_io *w)	769	ev_io_stop (struct ev_io *w)
382	{	770	{
		771	ev_clear ((W)w);
383	if (!ev_is_active (w))	772	if (!ev_is_active (w))
384	return;	773	return;
385		774
386	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	775	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
387	ev_stop ((struct ev_watcher *)w);	776	ev_stop ((W)w);
388		777
389	++fdchangecnt;	778	fd_change (w->fd);
390	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
391	fdchanges [fdchangecnt - 1] = w->fd;
392	}	779	}
393		780
394	void	781	void
395	evtimer_start (struct ev_timer *w)	782	ev_timer_start (struct ev_timer *w)
396	{	783	{
397	if (ev_is_active (w))	784	if (ev_is_active (w))
398	return;	785	return;
399		786
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;	787	w->at += now;
408	fprintf (stderr, "t2 %f a %d\n", w->at, w->is_abs);//D
409		788
410	ev_start ((struct ev_watcher *)w, ++timercnt);	789	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
		790
		791	ev_start ((W)w, ++timercnt);
411	array_needsize (timers, timermax, timercnt, );	792	array_needsize (timers, timermax, timercnt, );
412	timers [timercnt - 1] = w;	793	timers [timercnt - 1] = w;
413	upheap (timercnt - 1);	794	upheap ((WT *)timers, timercnt - 1);
414	}	795	}
415		796
416	void	797	void
417	evtimer_stop (struct ev_timer *w)	798	ev_timer_stop (struct ev_timer *w)
418	{	799	{
		800	ev_clear ((W)w);
419	if (!ev_is_active (w))	801	if (!ev_is_active (w))
420	return;	802	return;
421		803
		804	if (w->active < timercnt--)
		805	{
422	timers [w->active - 1] = timers [--timercnt];	806	timers [w->active - 1] = timers [timercnt];
423	downheap (w->active - 1);	807	downheap ((WT *)timers, timercnt, w->active - 1);
424	ev_stop ((struct ev_watcher *)w);	808	}
425	}
426		809
		810	w->at = w->repeat;
		811
		812	ev_stop ((W)w);
		813	}
		814
427	void	815	void
		816	ev_timer_again (struct ev_timer *w)
		817	{
		818	if (ev_is_active (w))
		819	{
		820	if (w->repeat)
		821	{
		822	w->at = now + w->repeat;
		823	downheap ((WT *)timers, timercnt, w->active - 1);
		824	}
		825	else
		826	ev_timer_stop (w);
		827	}
		828	else if (w->repeat)
		829	ev_timer_start (w);
		830	}
		831
		832	void
		833	ev_periodic_start (struct ev_periodic *w)
		834	{
		835	if (ev_is_active (w))
		836	return;
		837
		838	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
		839
		840	/* this formula differs from the one in periodic_reify because we do not always round up */
		841	if (w->interval)
		842	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		843
		844	ev_start ((W)w, ++periodiccnt);
		845	array_needsize (periodics, periodicmax, periodiccnt, );
		846	periodics [periodiccnt - 1] = w;
		847	upheap ((WT *)periodics, periodiccnt - 1);
		848	}
		849
		850	void
		851	ev_periodic_stop (struct ev_periodic *w)
		852	{
		853	ev_clear ((W)w);
		854	if (!ev_is_active (w))
		855	return;
		856
		857	if (w->active < periodiccnt--)
		858	{
		859	periodics [w->active - 1] = periodics [periodiccnt];
		860	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		861	}
		862
		863	ev_stop ((W)w);
		864	}
		865
		866	void
428	evsignal_start (struct ev_signal *w)	867	ev_signal_start (struct ev_signal *w)
429	{	868	{
430	if (ev_is_active (w))	869	if (ev_is_active (w))
431	return;	870	return;
432		871
433	ev_start ((struct ev_watcher *)w, 1);	872	ev_start ((W)w, 1);
434	array_needsize (signals, signalmax, w->signum, signals_init);	873	array_needsize (signals, signalmax, w->signum, signals_init);
435	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	874	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
436	}
437		875
		876	if (!w->next)
		877	{
		878	struct sigaction sa;
		879	sa.sa_handler = sighandler;
		880	sigfillset (&sa.sa_mask);
		881	sa.sa_flags = 0;
		882	sigaction (w->signum, &sa, 0);
		883	}
		884	}
		885
438	void	886	void
439	evsignal_stop (struct ev_signal *w)	887	ev_signal_stop (struct ev_signal *w)
440	{	888	{
		889	ev_clear ((W)w);
441	if (!ev_is_active (w))	890	if (!ev_is_active (w))
442	return;	891	return;
443		892
444	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	893	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		894	ev_stop ((W)w);
		895
		896	if (!signals [w->signum - 1].head)
		897	signal (w->signum, SIG_DFL);
		898	}
		899
		900	void
		901	ev_idle_start (struct ev_idle *w)
		902	{
		903	if (ev_is_active (w))
		904	return;
		905
		906	ev_start ((W)w, ++idlecnt);
		907	array_needsize (idles, idlemax, idlecnt, );
		908	idles [idlecnt - 1] = w;
		909	}
		910
		911	void
		912	ev_idle_stop (struct ev_idle *w)
		913	{
		914	ev_clear ((W)w);
		915	if (ev_is_active (w))
		916	return;
		917
		918	idles [w->active - 1] = idles [--idlecnt];
		919	ev_stop ((W)w);
		920	}
		921
		922	void
		923	ev_prepare_start (struct ev_prepare *w)
		924	{
		925	if (ev_is_active (w))
		926	return;
		927
		928	ev_start ((W)w, ++preparecnt);
		929	array_needsize (prepares, preparemax, preparecnt, );
		930	prepares [preparecnt - 1] = w;
		931	}
		932
		933	void
		934	ev_prepare_stop (struct ev_prepare *w)
		935	{
		936	ev_clear ((W)w);
		937	if (ev_is_active (w))
		938	return;
		939
		940	prepares [w->active - 1] = prepares [--preparecnt];
		941	ev_stop ((W)w);
		942	}
		943
		944	void
		945	ev_check_start (struct ev_check *w)
		946	{
		947	if (ev_is_active (w))
		948	return;
		949
		950	ev_start ((W)w, ++checkcnt);
		951	array_needsize (checks, checkmax, checkcnt, );
		952	checks [checkcnt - 1] = w;
		953	}
		954
		955	void
445	ev_stop ((struct ev_watcher *)w);	956	ev_check_stop (struct ev_check *w)
446	}	957	{
		958	ev_clear ((W)w);
		959	if (ev_is_active (w))
		960	return;
447		961
		962	checks [w->active - 1] = checks [--checkcnt];
		963	ev_stop ((W)w);
		964	}
		965
		966	void
		967	ev_child_start (struct ev_child *w)
		968	{
		969	if (ev_is_active (w))
		970	return;
		971
		972	ev_start ((W)w, 1);
		973	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		974	}
		975
		976	void
		977	ev_child_stop (struct ev_child *w)
		978	{
		979	ev_clear ((W)w);
		980	if (ev_is_active (w))
		981	return;
		982
		983	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		984	ev_stop ((W)w);
		985	}
		986
448	/*****************************************************************************/	987	/*****************************************************************************/
		988
		989	struct ev_once
		990	{
		991	struct ev_io io;
		992	struct ev_timer to;
		993	void (cb)(int revents, void arg);
		994	void *arg;
		995	};
		996
		997	static void
		998	once_cb (struct ev_once *once, int revents)
		999	{
		1000	void (cb)(int revents, void arg) = once->cb;
		1001	void *arg = once->arg;
		1002
		1003	ev_io_stop (&once->io);
		1004	ev_timer_stop (&once->to);
		1005	free (once);
		1006
		1007	cb (revents, arg);
		1008	}
		1009
		1010	static void
		1011	once_cb_io (struct ev_io *w, int revents)
		1012	{
		1013	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1014	}
		1015
		1016	static void
		1017	once_cb_to (struct ev_timer *w, int revents)
		1018	{
		1019	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1020	}
		1021
		1022	void
		1023	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1024	{
		1025	struct ev_once *once = malloc (sizeof (struct ev_once));
		1026
		1027	if (!once)
		1028	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1029	else
		1030	{
		1031	once->cb = cb;
		1032	once->arg = arg;
		1033
		1034	ev_watcher_init (&once->io, once_cb_io);
		1035	if (fd >= 0)
		1036	{
		1037	ev_io_set (&once->io, fd, events);
		1038	ev_io_start (&once->io);
		1039	}
		1040
		1041	ev_watcher_init (&once->to, once_cb_to);
		1042	if (timeout >= 0.)
		1043	{
		1044	ev_timer_set (&once->to, timeout, 0.);
		1045	ev_timer_start (&once->to);
		1046	}
		1047	}
		1048	}
		1049
		1050	/*****************************************************************************/
		1051
449	#if 1	1052	#if 0
		1053
		1054	struct ev_io wio;
450		1055
451	static void	1056	static void
452	sin_cb (struct ev_io *w, int revents)	1057	sin_cb (struct ev_io *w, int revents)
453	{	1058	{
454	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1059	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
455	}	1060	}
456		1061
457	static void	1062	static void
458	ocb (struct ev_timer *w, int revents)	1063	ocb (struct ev_timer *w, int revents)
459	{	1064	{
460	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1065	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1066	ev_timer_stop (w);
		1067	ev_timer_start (w);
		1068	}
		1069
		1070	static void
		1071	scb (struct ev_signal *w, int revents)
		1072	{
		1073	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1074	ev_io_stop (&wio);
		1075	ev_io_start (&wio);
		1076	}
		1077
		1078	static void
		1079	gcb (struct ev_signal *w, int revents)
		1080	{
		1081	fprintf (stderr, "generic %x\n", revents);
		1082
461	}	1083	}
462		1084
463	int main (void)	1085	int main (void)
464	{	1086	{
465	struct ev_io sin;
466
467	ev_init (0);	1087	ev_init (0);
468		1088
469	evw_init (&sin, sin_cb, 55);
470	evio_set (&sin, 0, EV_READ);	1089	ev_io_init (&wio, sin_cb, 0, EV_READ);
471	evio_start (&sin);	1090	ev_io_start (&wio);
		1091
		1092	struct ev_timer t[10000];
		1093
		1094	#if 0
		1095	int i;
		1096	for (i = 0; i < 10000; ++i)
		1097	{
		1098	struct ev_timer *w = t + i;
		1099	ev_watcher_init (w, ocb, i);
		1100	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
		1101	ev_timer_start (w);
		1102	if (drand48 () < 0.5)
		1103	ev_timer_stop (w);
		1104	}
		1105	#endif
472		1106
473	struct ev_timer t1;	1107	struct ev_timer t1;
474	evw_init (&t1, ocb, 1);	1108	ev_timer_init (&t1, ocb, 5, 10);
475	evtimer_set_rel (&t1, 1, 0);
476	evtimer_start (&t1);	1109	ev_timer_start (&t1);
477		1110
478	struct ev_timer t2;	1111	struct ev_signal sig;
479	evw_init (&t2, ocb, 2);	1112	ev_signal_init (&sig, scb, SIGQUIT);
480	evtimer_set_abs (&t2, ev_time () + 2, 0);	1113	ev_signal_start (&sig);
		1114
		1115	struct ev_check cw;
		1116	ev_check_init (&cw, gcb);
		1117	ev_check_start (&cw);
		1118
		1119	struct ev_idle iw;
		1120	ev_idle_init (&iw, gcb);
481	evtimer_start (&t2);	1121	ev_idle_start (&iw);
482		1122
483	ev_loop (0);	1123	ev_loop (0);
484		1124
485	return 0;	1125	return 0;
486	}	1126	}

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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 1.31 by root, Thu Nov 1 09:05:33 2007 UTC

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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 1.31 by root, Thu Nov 1 09:05:33 2007 UTC