[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 1.40 by root, Fri Nov 2 11:02:23 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_EPOLL
		62	# define EV_USE_EPOLL 0
		63	#endif
		64
		65	#ifndef EV_USE_REALTIME
		66	# define EV_USE_REALTIME 1
		67	#endif
		68
		69	/**/
		70
10	#ifdef CLOCK_MONOTONIC	71	#ifndef CLOCK_MONOTONIC
		72	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	73	# define EV_USE_MONOTONIC 0
12	#endif	74	#endif
13		75
14	#define HAVE_EPOLL 1	76	#ifndef CLOCK_REALTIME
		77	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	78	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	79	#endif
17		80
18	#define MAX_BLOCKTIME 60.	81	/**/
		82
		83	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		84	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		85	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		86	/#define CLEANUP_INTERVAL 300. / how often to try to free memory and re-check fds */
19		87
20	#include "ev.h"	88	#include "ev.h"
21		89
		90	#if __GNUC__ >= 3
		91	# define expect(expr,value) __builtin_expect ((expr),(value))
		92	# define inline inline
		93	#else
		94	# define expect(expr,value) (expr)
		95	# define inline static
		96	#endif
		97
		98	#define expect_false(expr) expect ((expr) != 0, 0)
		99	#define expect_true(expr) expect ((expr) != 0, 1)
		100
22	struct ev_watcher {	101	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	102	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	103	typedef struct ev_watcher_time *WT;
28	};
29		104
		105	static ev_tstamp now_floor, now, diff; /* monotonic clock */
30	ev_tstamp ev_now;	106	ev_tstamp ev_now;
31	int ev_method;	107	int ev_method;
32		108
33	static int have_monotonic; /* runtime */	109	static int have_monotonic; /* runtime */
34		110
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	111	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
36	static void (*method_reify)(void);	112	static void (*method_modify)(int fd, int oev, int nev);
37	static void (*method_poll)(ev_tstamp timeout);	113	static void (*method_poll)(ev_tstamp timeout);
		114
		115	/*****************************************************************************/
38		116
39	ev_tstamp	117	ev_tstamp
40	ev_time (void)	118	ev_time (void)
41	{	119	{
42	#if HAVE_REALTIME	120	#if EV_USE_REALTIME
43	struct timespec ts;	121	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	122	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	123	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	124	#else
47	struct timeval tv;	125	struct timeval tv;
51	}	129	}
52		130
53	static ev_tstamp	131	static ev_tstamp
54	get_clock (void)	132	get_clock (void)
55	{	133	{
56	#if HAVE_MONOTONIC	134	#if EV_USE_MONOTONIC
57	if (have_monotonic)	135	if (expect_true (have_monotonic))
58	{	136	{
59	struct timespec ts;	137	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	138	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	139	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	140	}
63	#endif	141	#endif
64		142
65	return ev_time ();	143	return ev_time ();
66	}	144	}
67		145
		146	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		147
68	#define array_needsize(base,cur,cnt,init) \	148	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	149	if (expect_false ((cnt) > cur)) \
70	{ \	150	{ \
71	int newcnt = cur; \	151	int newcnt = cur; \
72	do \	152	do \
73	{ \	153	{ \
74	newcnt += (newcnt >> 1) + 16; \	154	newcnt = array_roundsize (base, newcnt << 1); \
75	} \	155	} \
76	while ((cnt) > newcnt); \	156	while ((cnt) > newcnt); \
77	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	157	\
78	base = realloc (base, sizeof (base) (newcnt)); \	158	base = realloc (base, sizeof (base) (newcnt)); \
79	init (base + cur, newcnt - cur); \	159	init (base + cur, newcnt - cur); \
80	cur = newcnt; \	160	cur = newcnt; \
81	}	161	}
82		162
		163	/*****************************************************************************/
		164
83	typedef struct	165	typedef struct
84	{	166	{
85	struct ev_io *head;	167	struct ev_io *head;
86	unsigned char wev, rev; /* want, received event set */	168	unsigned char events;
		169	unsigned char reify;
87	} ANFD;	170	} ANFD;
88		171
89	static ANFD *anfds;	172	static ANFD *anfds;
90	static int anfdmax;	173	static int anfdmax;
91		174
92	static int *fdchanges;
93	static int fdchangemax, fdchangecnt;
94
95	static void	175	static void
96	anfds_init (ANFD *base, int count)	176	anfds_init (ANFD *base, int count)
97	{	177	{
98	while (count--)	178	while (count--)
99	{	179	{
100	base->head = 0;	180	base->head = 0;
101	base->wev = base->rev = EV_NONE;	181	base->events = EV_NONE;
		182	base->reify = 0;
		183
102	++base;	184	++base;
103	}	185	}
104	}	186	}
105		187
106	typedef struct	188	typedef struct
107	{	189	{
108	struct ev_watcher *w;	190	W w;
109	int events;	191	int events;
110	} ANPENDING;	192	} ANPENDING;
111		193
112	static ANPENDING *pendings;	194	static ANPENDING *pendings;
113	static int pendingmax, pendingcnt;	195	static int pendingmax, pendingcnt;
114		196
115	static void	197	static void
116	event (struct ev_watcher *w, int events)	198	event (W w, int events)
117	{	199	{
		200	if (w->pending)
		201	{
		202	pendings [w->pending - 1].events \|= events;
		203	return;
		204	}
		205
118	w->pending = ++pendingcnt;	206	w->pending = ++pendingcnt;
119	array_needsize (pendings, pendingmax, pendingcnt, );	207	array_needsize (pendings, pendingmax, pendingcnt, );
120	pendings [pendingcnt - 1].w = w;	208	pendings [pendingcnt - 1].w = w;
121	pendings [pendingcnt - 1].events = events;	209	pendings [pendingcnt - 1].events = events;
122	}	210	}
123		211
124	static void	212	static void
		213	queue_events (W *events, int eventcnt, int type)
		214	{
		215	int i;
		216
		217	for (i = 0; i < eventcnt; ++i)
		218	event (events [i], type);
		219	}
		220
		221	static void
125	fd_event (int fd, int events)	222	fd_event (int fd, int events)
126	{	223	{
127	ANFD *anfd = anfds + fd;	224	ANFD *anfd = anfds + fd;
128	struct ev_io *w;	225	struct ev_io *w;
129		226
130	for (w = anfd->head; w; w = w->next)	227	for (w = anfd->head; w; w = w->next)
131	{	228	{
132	int ev = w->events & events;	229	int ev = w->events & events;
133		230
134	if (ev)	231	if (ev)
135	event ((struct ev_watcher *)w, ev);	232	event ((W)w, ev);
		233	}
		234	}
		235
		236	/*****************************************************************************/
		237
		238	static int *fdchanges;
		239	static int fdchangemax, fdchangecnt;
		240
		241	static void
		242	fd_reify (void)
		243	{
		244	int i;
		245
		246	for (i = 0; i < fdchangecnt; ++i)
136	}	247	{
		248	int fd = fdchanges [i];
		249	ANFD *anfd = anfds + fd;
		250	struct ev_io *w;
		251
		252	int events = 0;
		253
		254	for (w = anfd->head; w; w = w->next)
		255	events \|= w->events;
		256
		257	anfd->reify = 0;
		258
		259	if (anfd->events != events)
		260	{
		261	method_modify (fd, anfd->events, events);
		262	anfd->events = events;
		263	}
		264	}
		265
		266	fdchangecnt = 0;
137	}	267	}
		268
		269	static void
		270	fd_change (int fd)
		271	{
		272	if (anfds [fd].reify \|\| fdchangecnt < 0)
		273	return;
		274
		275	anfds [fd].reify = 1;
		276
		277	++fdchangecnt;
		278	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		279	fdchanges [fdchangecnt - 1] = fd;
		280	}
		281
		282	/* called on EBADF to verify fds */
		283	static void
		284	fd_recheck (void)
		285	{
		286	int fd;
		287
		288	for (fd = 0; fd < anfdmax; ++fd)
		289	if (anfds [fd].events)
		290	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		291	while (anfds [fd].head)
		292	{
		293	ev_io_stop (anfds [fd].head);
		294	event ((W)anfds [fd].head, EV_ERROR \| EV_READ \| EV_WRITE);
		295	}
		296	}
		297
		298	/*****************************************************************************/
138		299
139	static struct ev_timer **timers;	300	static struct ev_timer **timers;
140	static int timermax, timercnt;	301	static int timermax, timercnt;
141		302
		303	static struct ev_periodic **periodics;
		304	static int periodicmax, periodiccnt;
		305
142	static void	306	static void
143	upheap (int k)	307	upheap (WT *timers, int k)
144	{	308	{
145	struct ev_timer *w = timers [k];	309	WT w = timers [k];
146		310
147	while (k && timers [k >> 1]->at > w->at)	311	while (k && timers [k >> 1]->at > w->at)
148	{	312	{
149	timers [k] = timers [k >> 1];	313	timers [k] = timers [k >> 1];
150	timers [k]->active = k + 1;	314	timers [k]->active = k + 1;
…		…
155	timers [k]->active = k + 1;	319	timers [k]->active = k + 1;
156		320
157	}	321	}
158		322
159	static void	323	static void
160	downheap (int k)	324	downheap (WT *timers, int N, int k)
161	{	325	{
162	struct ev_timer *w = timers [k];	326	WT w = timers [k];
163		327
164	while (k <= (timercnt >> 1))	328	while (k < (N >> 1))
165	{	329	{
166	int j = k << 1;	330	int j = k << 1;
167		331
168	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	332	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
169	++j;	333	++j;
170		334
171	if (w->at <= timers [j]->at)	335	if (w->at <= timers [j]->at)
172	break;	336	break;
173		337
174	timers [k] = timers [j];	338	timers [k] = timers [j];
175	timers [k]->active = k;	339	timers [k]->active = k + 1;
176	k = j;	340	k = j;
177	}	341	}
178		342
179	timers [k] = w;	343	timers [k] = w;
180	timers [k]->active = k + 1;	344	timers [k]->active = k + 1;
181	}	345	}
182		346
183	static struct ev_signal **signals;	347	/*****************************************************************************/
		348
		349	typedef struct
		350	{
		351	struct ev_signal *head;
		352	sig_atomic_t volatile gotsig;
		353	} ANSIG;
		354
		355	static ANSIG *signals;
184	static int signalmax, signalcnt;	356	static int signalmax;
185		357
		358	static int sigpipe [2];
		359	static sig_atomic_t volatile gotsig;
		360	static struct ev_io sigev;
		361
186	static void	362	static void
187	signals_init (struct ev_signal **base, int count)	363	signals_init (ANSIG *base, int count)
188	{	364	{
189	while (count--)	365	while (count--)
190	*base++ = 0;	366	{
191	}	367	base->head = 0;
		368	base->gotsig = 0;
192		369
		370	++base;
		371	}
		372	}
		373
		374	static void
		375	sighandler (int signum)
		376	{
		377	signals [signum - 1].gotsig = 1;
		378
		379	if (!gotsig)
		380	{
		381	gotsig = 1;
		382	write (sigpipe [1], &signum, 1);
		383	}
		384	}
		385
		386	static void
		387	sigcb (struct ev_io *iow, int revents)
		388	{
		389	struct ev_signal *w;
		390	int signum;
		391
		392	read (sigpipe [0], &revents, 1);
		393	gotsig = 0;
		394
		395	for (signum = signalmax; signum--; )
		396	if (signals [signum].gotsig)
		397	{
		398	signals [signum].gotsig = 0;
		399
		400	for (w = signals [signum].head; w; w = w->next)
		401	event ((W)w, EV_SIGNAL);
		402	}
		403	}
		404
		405	static void
		406	siginit (void)
		407	{
		408	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		409	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		410
		411	/* rather than sort out wether we really need nb, set it */
		412	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		413	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		414
		415	ev_io_set (&sigev, sigpipe [0], EV_READ);
		416	ev_io_start (&sigev);
		417	}
		418
		419	/*****************************************************************************/
		420
		421	static struct ev_idle **idles;
		422	static int idlemax, idlecnt;
		423
		424	static struct ev_prepare **prepares;
		425	static int preparemax, preparecnt;
		426
		427	static struct ev_check **checks;
		428	static int checkmax, checkcnt;
		429
		430	/*****************************************************************************/
		431
		432	static struct ev_child *childs [PID_HASHSIZE];
		433	static struct ev_signal childev;
		434
		435	#ifndef WCONTINUED
		436	# define WCONTINUED 0
		437	#endif
		438
		439	static void
		440	childcb (struct ev_signal *sw, int revents)
		441	{
		442	struct ev_child *w;
		443	int pid, status;
		444
		445	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		446	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		447	if (w->pid == pid \|\| !w->pid)
		448	{
		449	w->status = status;
		450	event ((W)w, EV_CHILD);
		451	}
		452	}
		453
		454	/*****************************************************************************/
		455
193	#if HAVE_EPOLL	456	#if EV_USE_EPOLL
194	# include "ev_epoll.c"	457	# include "ev_epoll.c"
195	#endif	458	#endif
196	#if HAVE_SELECT	459	#if EV_USE_SELECT
197	# include "ev_select.c"	460	# include "ev_select.c"
198	#endif	461	#endif
199		462
		463	int
		464	ev_version_major (void)
		465	{
		466	return EV_VERSION_MAJOR;
		467	}
		468
		469	int
		470	ev_version_minor (void)
		471	{
		472	return EV_VERSION_MINOR;
		473	}
		474
200	int ev_init (int flags)	475	int ev_init (int flags)
201	{	476	{
		477	if (!ev_method)
		478	{
202	#if HAVE_MONOTONIC	479	#if EV_USE_MONOTONIC
203	{	480	{
204	struct timespec ts;	481	struct timespec ts;
205	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	482	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
206	have_monotonic = 1;	483	have_monotonic = 1;
207	}	484	}
208	#endif	485	#endif
209		486
210	ev_now = ev_time ();	487	ev_now = ev_time ();
		488	now = get_clock ();
		489	now_floor = now;
		490	diff = ev_now - now;
211		491
212	#if HAVE_EPOLL	492	if (pipe (sigpipe))
213	if (epoll_init (flags))	493	return 0;
214	return ev_method;
215	#endif
216	#if HAVE_SELECT
217	if (select_init (flags))
218	return ev_method;
219	#endif
220		494
221	ev_method = EVMETHOD_NONE;	495	ev_method = EVMETHOD_NONE;
		496	#if EV_USE_EPOLL
		497	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
		498	#endif
		499	#if EV_USE_SELECT
		500	if (ev_method == EVMETHOD_NONE) select_init (flags);
		501	#endif
		502
		503	if (ev_method)
		504	{
		505	ev_watcher_init (&sigev, sigcb);
		506	siginit ();
		507
		508	ev_signal_init (&childev, childcb, SIGCHLD);
		509	ev_signal_start (&childev);
		510	}
		511	}
		512
222	return ev_method;	513	return ev_method;
223	}	514	}
224		515
225	void ev_prefork (void)	516	/*****************************************************************************/
226	{
227	}
228		517
		518	void
		519	ev_fork_prepare (void)
		520	{
		521	/* nop */
		522	}
		523
		524	void
229	void ev_postfork_parent (void)	525	ev_fork_parent (void)
230	{	526	{
		527	/* nop */
231	}	528	}
232		529
		530	void
233	void ev_postfork_child (void)	531	ev_fork_child (void)
234	{	532	{
235	#if HAVE_EPOLL	533	#if EV_USE_EPOLL
		534	if (ev_method == EVMETHOD_EPOLL)
236	epoll_postfork_child ();	535	epoll_postfork_child ();
237	#endif	536	#endif
238	}
239		537
		538	ev_io_stop (&sigev);
		539	close (sigpipe [0]);
		540	close (sigpipe [1]);
		541	pipe (sigpipe);
		542	siginit ();
		543	}
		544
		545	/*****************************************************************************/
		546
240	static void	547	static void
241	call_pending ()	548	call_pending (void)
242	{	549	{
243	int i;	550	while (pendingcnt)
244
245	for (i = 0; i < pendingcnt; ++i)
246	{	551	{
247	ANPENDING *p = pendings + i;	552	ANPENDING *p = pendings + --pendingcnt;
248		553
249	if (p->w)	554	if (p->w)
250	{	555	{
251	p->w->pending = 0;	556	p->w->pending = 0;
252	p->w->cb (p->w, p->events);	557	p->w->cb (p->w, p->events);
253	}	558	}
254	}	559	}
255
256	pendingcnt = 0;
257	}	560	}
258		561
259	static void	562	static void
260	timer_reify (void)	563	timers_reify (void)
261	{	564	{
262	while (timercnt && timers [0]->at <= ev_now)	565	while (timercnt && timers [0]->at <= now)
263	{	566	{
264	struct ev_timer *w = timers [0];	567	struct ev_timer *w = timers [0];
265		568
266	/* first reschedule timer */	569	/* first reschedule or stop timer */
267	if (w->repeat)	570	if (w->repeat)
268	{	571	{
269	fprintf (stderr, "a %f now %f repeat %f, %f\n", w->at, ev_now, w->repeat, w->repeat *1e30);//D	572	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
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;	573	w->at = now + w->repeat;
274		574	downheap ((WT *)timers, timercnt, 0);
275	fprintf (stderr, "b %f\n", w->at);//D
276
277	downheap (0);
278	}	575	}
279	else	576	else
280	evtimer_stop (w); /* nonrepeating: stop timer */	577	ev_timer_stop (w); /* nonrepeating: stop timer */
281		578
282	event ((struct ev_watcher *)w, EV_TIMEOUT);	579	event ((W)w, EV_TIMEOUT);
		580	}
		581	}
		582
		583	static void
		584	periodics_reify (void)
		585	{
		586	while (periodiccnt && periodics [0]->at <= ev_now)
		587	{
		588	struct ev_periodic *w = periodics [0];
		589
		590	/* first reschedule or stop timer */
		591	if (w->interval)
		592	{
		593	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		594	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
		595	downheap ((WT *)periodics, periodiccnt, 0);
		596	}
		597	else
		598	ev_periodic_stop (w); /* nonrepeating: stop timer */
		599
		600	event ((W)w, EV_PERIODIC);
		601	}
		602	}
		603
		604	static void
		605	periodics_reschedule (ev_tstamp diff)
		606	{
		607	int i;
		608
		609	/* adjust periodics after time jump */
		610	for (i = 0; i < periodiccnt; ++i)
		611	{
		612	struct ev_periodic *w = periodics [i];
		613
		614	if (w->interval)
		615	{
		616	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		617
		618	if (fabs (diff) >= 1e-4)
		619	{
		620	ev_periodic_stop (w);
		621	ev_periodic_start (w);
		622
		623	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		624	}
		625	}
		626	}
		627	}
		628
		629	static int
		630	time_update_monotonic (void)
		631	{
		632	now = get_clock ();
		633
		634	if (expect_true (now - now_floor < MIN_TIMEJUMP * .5))
		635	{
		636	ev_now = now + diff;
		637	return 0;
		638	}
		639	else
		640	{
		641	now_floor = now;
		642	ev_now = ev_time ();
		643	return 1;
		644	}
		645	}
		646
		647	static void
		648	time_update (void)
		649	{
		650	int i;
		651
		652	#if EV_USE_MONOTONIC
		653	if (expect_true (have_monotonic))
		654	{
		655	if (time_update_monotonic ())
		656	{
		657	ev_tstamp odiff = diff;
		658
		659	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		660	{
		661	diff = ev_now - now;
		662
		663	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		664	return; /* all is well */
		665
		666	ev_now = ev_time ();
		667	now = get_clock ();
		668	now_floor = now;
		669	}
		670
		671	periodics_reschedule (diff - odiff);
		672	/* no timer adjustment, as the monotonic clock doesn't jump */
		673	}
		674	}
		675	else
		676	#endif
		677	{
		678	ev_now = ev_time ();
		679
		680	if (expect_false (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		681	{
		682	periodics_reschedule (ev_now - now);
		683
		684	/* adjust timers. this is easy, as the offset is the same for all */
		685	for (i = 0; i < timercnt; ++i)
		686	timers [i]->at += diff;
		687	}
		688
		689	now = ev_now;
283	}	690	}
284	}	691	}
285		692
286	int ev_loop_done;	693	int ev_loop_done;
287		694
288	int ev_loop (int flags)	695	void ev_loop (int flags)
289	{	696	{
290	double block;	697	double block;
291	ev_loop_done = flags & EVLOOP_ONESHOT;	698	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
292		699
293	do	700	do
294	{	701	{
		702	/* queue check watchers (and execute them) */
		703	if (expect_false (preparecnt))
		704	{
		705	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		706	call_pending ();
		707	}
		708
295	/* update fd-related kernel structures */	709	/* update fd-related kernel structures */
296	method_reify (); fdchangecnt = 0;	710	fd_reify ();
297		711
298	/* calculate blocking time */	712	/* calculate blocking time */
		713
		714	/* we only need this for !monotonic clockor timers, but as we basically
		715	always have timers, we just calculate it always */
		716	#if EV_USE_MONOTONIC
		717	if (expect_true (have_monotonic))
		718	time_update_monotonic ();
		719	else
		720	#endif
		721	{
299	ev_now = ev_time ();	722	ev_now = ev_time ();
		723	now = ev_now;
		724	}
300		725
301	if (flags & EVLOOP_NONBLOCK)	726	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
302	block = 0.;	727	block = 0.;
303	else if (!timercnt)
304	block = MAX_BLOCKTIME;
305	else	728	else
306	{	729	{
		730	block = MAX_BLOCKTIME;
		731
		732	if (timercnt)
		733	{
307	block = timers [0]->at - ev_now + method_fudge;	734	ev_tstamp to = timers [0]->at - now + method_fudge;
		735	if (block > to) block = to;
		736	}
		737
		738	if (periodiccnt)
		739	{
		740	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
		741	if (block > to) block = to;
		742	}
		743
308	if (block < 0.) block = 0.;	744	if (block < 0.) block = 0.;
309	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
310	}	745	}
311		746
312	fprintf (stderr, "block %f\n", block);//D
313	method_poll (block);	747	method_poll (block);
314		748
		749	/* update ev_now, do magic */
		750	time_update ();
		751
315	/* put pending timers into pendign queue and reschedule them */	752	/* queue pending timers and reschedule them */
316	timer_reify ();	753	timers_reify (); /* relative timers called last */
		754	periodics_reify (); /* absolute timers called first */
317		755
318	ev_now = ev_time ();	756	/* queue idle watchers unless io or timers are pending */
		757	if (!pendingcnt)
		758	queue_events ((W *)idles, idlecnt, EV_IDLE);
		759
		760	/* queue check watchers, to be executed first */
		761	if (checkcnt)
		762	queue_events ((W *)checks, checkcnt, EV_CHECK);
		763
319	call_pending ();	764	call_pending ();
320	}	765	}
321	while (!ev_loop_done);	766	while (!ev_loop_done);
322	}
323		767
		768	if (ev_loop_done != 2)
		769	ev_loop_done = 0;
		770	}
		771
		772	/*****************************************************************************/
		773
324	static void	774	static void
325	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	775	wlist_add (WL *head, WL elem)
326	{	776	{
327	elem->next = *head;	777	elem->next = *head;
328	*head = elem;	778	*head = elem;
329	}	779	}
330		780
331	static void	781	static void
332	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	782	wlist_del (WL *head, WL elem)
333	{	783	{
334	while (*head)	784	while (*head)
335	{	785	{
336	if (*head == elem)	786	if (*head == elem)
337	{	787	{
…		…
342	head = &(*head)->next;	792	head = &(*head)->next;
343	}	793	}
344	}	794	}
345		795
346	static void	796	static void
347	ev_start (struct ev_watcher *w, int active)	797	ev_clear_pending (W w)
348	{	798	{
		799	if (w->pending)
		800	{
		801	pendings [w->pending - 1].w = 0;
349	w->pending = 0;	802	w->pending = 0;
		803	}
		804	}
		805
		806	static void
		807	ev_start (W w, int active)
		808	{
350	w->active = active;	809	w->active = active;
351	}	810	}
352		811
353	static void	812	static void
354	ev_stop (struct ev_watcher *w)	813	ev_stop (W w)
355	{	814	{
356	if (w->pending)
357	pendings [w->pending - 1].w = 0;
358
359	w->active = 0;	815	w->active = 0;
360	/* nop */
361	}	816	}
362		817
		818	/*****************************************************************************/
		819
363	void	820	void
364	evio_start (struct ev_io *w)	821	ev_io_start (struct ev_io *w)
365	{	822	{
		823	int fd = w->fd;
		824
366	if (ev_is_active (w))	825	if (ev_is_active (w))
367	return;	826	return;
368		827
369	int fd = w->fd;	828	assert (("ev_io_start called with negative fd", fd >= 0));
370		829
371	ev_start ((struct ev_watcher *)w, 1);	830	ev_start ((W)w, 1);
372	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	831	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
373	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	832	wlist_add ((WL *)&anfds[fd].head, (WL)w);
374		833
375	++fdchangecnt;	834	fd_change (fd);
376	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
377	fdchanges [fdchangecnt - 1] = fd;
378	}	835	}
379		836
380	void	837	void
381	evio_stop (struct ev_io *w)	838	ev_io_stop (struct ev_io *w)
382	{	839	{
		840	ev_clear_pending ((W)w);
383	if (!ev_is_active (w))	841	if (!ev_is_active (w))
384	return;	842	return;
385		843
386	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	844	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
387	ev_stop ((struct ev_watcher *)w);	845	ev_stop ((W)w);
388		846
389	++fdchangecnt;	847	fd_change (w->fd);
390	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
391	fdchanges [fdchangecnt - 1] = w->fd;
392	}	848	}
393		849
394	void	850	void
395	evtimer_start (struct ev_timer *w)	851	ev_timer_start (struct ev_timer *w)
396	{	852	{
397	if (ev_is_active (w))	853	if (ev_is_active (w))
398	return;	854	return;
399		855
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;	856	w->at += now;
408	fprintf (stderr, "t2 %f a %d\n", w->at, w->is_abs);//D
409		857
410	ev_start ((struct ev_watcher *)w, ++timercnt);	858	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		859
		860	ev_start ((W)w, ++timercnt);
411	array_needsize (timers, timermax, timercnt, );	861	array_needsize (timers, timermax, timercnt, );
412	timers [timercnt - 1] = w;	862	timers [timercnt - 1] = w;
413	upheap (timercnt - 1);	863	upheap ((WT *)timers, timercnt - 1);
414	}	864	}
415		865
416	void	866	void
417	evtimer_stop (struct ev_timer *w)	867	ev_timer_stop (struct ev_timer *w)
418	{	868	{
		869	ev_clear_pending ((W)w);
419	if (!ev_is_active (w))	870	if (!ev_is_active (w))
420	return;	871	return;
421		872
		873	if (w->active < timercnt--)
		874	{
422	timers [w->active - 1] = timers [--timercnt];	875	timers [w->active - 1] = timers [timercnt];
423	downheap (w->active - 1);	876	downheap ((WT *)timers, timercnt, w->active - 1);
424	ev_stop ((struct ev_watcher *)w);	877	}
425	}
426		878
		879	w->at = w->repeat;
		880
		881	ev_stop ((W)w);
		882	}
		883
427	void	884	void
428	evsignal_start (struct ev_signal *w)	885	ev_timer_again (struct ev_timer *w)
429	{	886	{
430	if (ev_is_active (w))	887	if (ev_is_active (w))
431	return;	888	{
		889	if (w->repeat)
		890	{
		891	w->at = now + w->repeat;
		892	downheap ((WT *)timers, timercnt, w->active - 1);
		893	}
		894	else
		895	ev_timer_stop (w);
		896	}
		897	else if (w->repeat)
		898	ev_timer_start (w);
		899	}
432		900
433	ev_start ((struct ev_watcher *)w, 1);	901	void
		902	ev_periodic_start (struct ev_periodic *w)
		903	{
		904	if (ev_is_active (w))
		905	return;
		906
		907	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		908
		909	/* this formula differs from the one in periodic_reify because we do not always round up */
		910	if (w->interval)
		911	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		912
		913	ev_start ((W)w, ++periodiccnt);
		914	array_needsize (periodics, periodicmax, periodiccnt, );
		915	periodics [periodiccnt - 1] = w;
		916	upheap ((WT *)periodics, periodiccnt - 1);
		917	}
		918
		919	void
		920	ev_periodic_stop (struct ev_periodic *w)
		921	{
		922	ev_clear_pending ((W)w);
		923	if (!ev_is_active (w))
		924	return;
		925
		926	if (w->active < periodiccnt--)
		927	{
		928	periodics [w->active - 1] = periodics [periodiccnt];
		929	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		930	}
		931
		932	ev_stop ((W)w);
		933	}
		934
		935	void
		936	ev_signal_start (struct ev_signal *w)
		937	{
		938	if (ev_is_active (w))
		939	return;
		940
		941	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		942
		943	ev_start ((W)w, 1);
434	array_needsize (signals, signalmax, w->signum, signals_init);	944	array_needsize (signals, signalmax, w->signum, signals_init);
435	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	945	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
436	}
437		946
		947	if (!w->next)
		948	{
		949	struct sigaction sa;
		950	sa.sa_handler = sighandler;
		951	sigfillset (&sa.sa_mask);
		952	sa.sa_flags = 0;
		953	sigaction (w->signum, &sa, 0);
		954	}
		955	}
		956
438	void	957	void
439	evsignal_stop (struct ev_signal *w)	958	ev_signal_stop (struct ev_signal *w)
440	{	959	{
		960	ev_clear_pending ((W)w);
441	if (!ev_is_active (w))	961	if (!ev_is_active (w))
442	return;	962	return;
443		963
444	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	964	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		965	ev_stop ((W)w);
		966
		967	if (!signals [w->signum - 1].head)
		968	signal (w->signum, SIG_DFL);
		969	}
		970
		971	void
		972	ev_idle_start (struct ev_idle *w)
		973	{
		974	if (ev_is_active (w))
		975	return;
		976
		977	ev_start ((W)w, ++idlecnt);
		978	array_needsize (idles, idlemax, idlecnt, );
		979	idles [idlecnt - 1] = w;
		980	}
		981
		982	void
		983	ev_idle_stop (struct ev_idle *w)
		984	{
		985	ev_clear_pending ((W)w);
		986	if (ev_is_active (w))
		987	return;
		988
		989	idles [w->active - 1] = idles [--idlecnt];
		990	ev_stop ((W)w);
		991	}
		992
		993	void
		994	ev_prepare_start (struct ev_prepare *w)
		995	{
		996	if (ev_is_active (w))
		997	return;
		998
		999	ev_start ((W)w, ++preparecnt);
		1000	array_needsize (prepares, preparemax, preparecnt, );
		1001	prepares [preparecnt - 1] = w;
		1002	}
		1003
		1004	void
		1005	ev_prepare_stop (struct ev_prepare *w)
		1006	{
		1007	ev_clear_pending ((W)w);
		1008	if (ev_is_active (w))
		1009	return;
		1010
		1011	prepares [w->active - 1] = prepares [--preparecnt];
		1012	ev_stop ((W)w);
		1013	}
		1014
		1015	void
		1016	ev_check_start (struct ev_check *w)
		1017	{
		1018	if (ev_is_active (w))
		1019	return;
		1020
		1021	ev_start ((W)w, ++checkcnt);
		1022	array_needsize (checks, checkmax, checkcnt, );
		1023	checks [checkcnt - 1] = w;
		1024	}
		1025
		1026	void
445	ev_stop ((struct ev_watcher *)w);	1027	ev_check_stop (struct ev_check *w)
446	}	1028	{
		1029	ev_clear_pending ((W)w);
		1030	if (ev_is_active (w))
		1031	return;
447		1032
		1033	checks [w->active - 1] = checks [--checkcnt];
		1034	ev_stop ((W)w);
		1035	}
		1036
		1037	void
		1038	ev_child_start (struct ev_child *w)
		1039	{
		1040	if (ev_is_active (w))
		1041	return;
		1042
		1043	ev_start ((W)w, 1);
		1044	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1045	}
		1046
		1047	void
		1048	ev_child_stop (struct ev_child *w)
		1049	{
		1050	ev_clear_pending ((W)w);
		1051	if (ev_is_active (w))
		1052	return;
		1053
		1054	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1055	ev_stop ((W)w);
		1056	}
		1057
448	/*****************************************************************************/	1058	/*****************************************************************************/
		1059
		1060	struct ev_once
		1061	{
		1062	struct ev_io io;
		1063	struct ev_timer to;
		1064	void (cb)(int revents, void arg);
		1065	void *arg;
		1066	};
		1067
		1068	static void
		1069	once_cb (struct ev_once *once, int revents)
		1070	{
		1071	void (cb)(int revents, void arg) = once->cb;
		1072	void *arg = once->arg;
		1073
		1074	ev_io_stop (&once->io);
		1075	ev_timer_stop (&once->to);
		1076	free (once);
		1077
		1078	cb (revents, arg);
		1079	}
		1080
		1081	static void
		1082	once_cb_io (struct ev_io *w, int revents)
		1083	{
		1084	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1085	}
		1086
		1087	static void
		1088	once_cb_to (struct ev_timer *w, int revents)
		1089	{
		1090	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1091	}
		1092
		1093	void
		1094	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1095	{
		1096	struct ev_once *once = malloc (sizeof (struct ev_once));
		1097
		1098	if (!once)
		1099	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1100	else
		1101	{
		1102	once->cb = cb;
		1103	once->arg = arg;
		1104
		1105	ev_watcher_init (&once->io, once_cb_io);
		1106	if (fd >= 0)
		1107	{
		1108	ev_io_set (&once->io, fd, events);
		1109	ev_io_start (&once->io);
		1110	}
		1111
		1112	ev_watcher_init (&once->to, once_cb_to);
		1113	if (timeout >= 0.)
		1114	{
		1115	ev_timer_set (&once->to, timeout, 0.);
		1116	ev_timer_start (&once->to);
		1117	}
		1118	}
		1119	}
		1120
		1121	/*****************************************************************************/
		1122
449	#if 1	1123	#if 0
		1124
		1125	struct ev_io wio;
450		1126
451	static void	1127	static void
452	sin_cb (struct ev_io *w, int revents)	1128	sin_cb (struct ev_io *w, int revents)
453	{	1129	{
454	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1130	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
455	}	1131	}
456		1132
457	static void	1133	static void
458	ocb (struct ev_timer *w, int revents)	1134	ocb (struct ev_timer *w, int revents)
459	{	1135	{
460	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1136	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1137	ev_timer_stop (w);
		1138	ev_timer_start (w);
		1139	}
		1140
		1141	static void
		1142	scb (struct ev_signal *w, int revents)
		1143	{
		1144	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1145	ev_io_stop (&wio);
		1146	ev_io_start (&wio);
		1147	}
		1148
		1149	static void
		1150	gcb (struct ev_signal *w, int revents)
		1151	{
		1152	fprintf (stderr, "generic %x\n", revents);
		1153
461	}	1154	}
462		1155
463	int main (void)	1156	int main (void)
464	{	1157	{
465	struct ev_io sin;
466
467	ev_init (0);	1158	ev_init (0);
468		1159
469	evw_init (&sin, sin_cb, 55);
470	evio_set (&sin, 0, EV_READ);	1160	ev_io_init (&wio, sin_cb, 0, EV_READ);
471	evio_start (&sin);	1161	ev_io_start (&wio);
		1162
		1163	struct ev_timer t[10000];
		1164
		1165	#if 0
		1166	int i;
		1167	for (i = 0; i < 10000; ++i)
		1168	{
		1169	struct ev_timer *w = t + i;
		1170	ev_watcher_init (w, ocb, i);
		1171	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
		1172	ev_timer_start (w);
		1173	if (drand48 () < 0.5)
		1174	ev_timer_stop (w);
		1175	}
		1176	#endif
472		1177
473	struct ev_timer t1;	1178	struct ev_timer t1;
474	evw_init (&t1, ocb, 1);	1179	ev_timer_init (&t1, ocb, 5, 10);
475	evtimer_set_rel (&t1, 1, 0);
476	evtimer_start (&t1);	1180	ev_timer_start (&t1);
477		1181
478	struct ev_timer t2;	1182	struct ev_signal sig;
479	evw_init (&t2, ocb, 2);	1183	ev_signal_init (&sig, scb, SIGQUIT);
480	evtimer_set_abs (&t2, ev_time () + 2, 0);	1184	ev_signal_start (&sig);
		1185
		1186	struct ev_check cw;
		1187	ev_check_init (&cw, gcb);
		1188	ev_check_start (&cw);
		1189
		1190	struct ev_idle iw;
		1191	ev_idle_init (&iw, gcb);
481	evtimer_start (&t2);	1192	ev_idle_start (&iw);
482		1193
483	ev_loop (0);	1194	ev_loop (0);
484		1195
485	return 0;	1196	return 0;
486	}	1197	}

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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 1.40 by root, Fri Nov 2 11:02:23 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 1.40 by root, Fri Nov 2 11:02:23 2007 UTC