[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 1.40 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
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	/**/
		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
11	#ifdef CLOCK_MONOTONIC	71	#ifndef CLOCK_MONOTONIC
		72	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	73	# define EV_USE_MONOTONIC 0
13	#endif	74	#endif
14		75
15	#define HAVE_EPOLL 1	76	#ifndef CLOCK_REALTIME
		77	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	78	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 0	79	#endif
		80
		81	/**/
18		82
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	83	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	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 */
21		87
22	#include "ev.h"	88	#include "ev.h"
23		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
24	struct ev_watcher {	101	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	102	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	103	typedef struct ev_watcher_time *WT;
30	};
31		104
32	static ev_tstamp now, diff; /* monotonic clock */	105	static ev_tstamp now_floor, now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	106	ev_tstamp ev_now;
34	int ev_method;	107	int ev_method;
35		108
36	static int have_monotonic; /* runtime */	109	static int have_monotonic; /* runtime */
37		110
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	111	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
39	static void (*method_reify)(void);	112	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);	113	static void (*method_poll)(ev_tstamp timeout);
		114
		115	/*****************************************************************************/
41		116
42	ev_tstamp	117	ev_tstamp
43	ev_time (void)	118	ev_time (void)
44	{	119	{
45	#if HAVE_REALTIME	120	#if EV_USE_REALTIME
46	struct timespec ts;	121	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	122	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	123	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	124	#else
50	struct timeval tv;	125	struct timeval tv;
54	}	129	}
55		130
56	static ev_tstamp	131	static ev_tstamp
57	get_clock (void)	132	get_clock (void)
58	{	133	{
59	#if HAVE_MONOTONIC	134	#if EV_USE_MONOTONIC
60	if (have_monotonic)	135	if (expect_true (have_monotonic))
61	{	136	{
62	struct timespec ts;	137	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	138	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	139	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	140	}
66	#endif	141	#endif
67		142
68	return ev_time ();	143	return ev_time ();
69	}	144	}
70		145
		146	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		147
71	#define array_needsize(base,cur,cnt,init) \	148	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	149	if (expect_false ((cnt) > cur)) \
73	{ \	150	{ \
74	int newcnt = cur ? cur << 1 : 16; \	151	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	152	do \
		153	{ \
		154	newcnt = array_roundsize (base, newcnt << 1); \
		155	} \
		156	while ((cnt) > newcnt); \
		157	\
76	base = realloc (base, sizeof (base) (newcnt)); \	158	base = realloc (base, sizeof (base) (newcnt)); \
77	init (base + cur, newcnt - cur); \	159	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	160	cur = newcnt; \
79	}	161	}
80		162
		163	/*****************************************************************************/
		164
81	typedef struct	165	typedef struct
82	{	166	{
83	struct ev_io *head;	167	struct ev_io *head;
84	unsigned char wev, rev; /* want, received event set */	168	unsigned char events;
		169	unsigned char reify;
85	} ANFD;	170	} ANFD;
86		171
87	static ANFD *anfds;	172	static ANFD *anfds;
88	static int anfdmax;	173	static int anfdmax;
89		174
90	static int *fdchanges;
91	static int fdchangemax, fdchangecnt;
92
93	static void	175	static void
94	anfds_init (ANFD *base, int count)	176	anfds_init (ANFD *base, int count)
95	{	177	{
96	while (count--)	178	while (count--)
97	{	179	{
98	base->head = 0;	180	base->head = 0;
99	base->wev = base->rev = EV_NONE;	181	base->events = EV_NONE;
		182	base->reify = 0;
		183
100	++base;	184	++base;
101	}	185	}
102	}	186	}
103		187
104	typedef struct	188	typedef struct
105	{	189	{
106	struct ev_watcher *w;	190	W w;
107	int events;	191	int events;
108	} ANPENDING;	192	} ANPENDING;
109		193
110	static ANPENDING *pendings;	194	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;	195	static int pendingmax, pendingcnt;
112		196
113	static void	197	static void
114	event (struct ev_watcher *w, int events)	198	event (W w, int events)
115	{	199	{
		200	if (w->pending)
		201	{
		202	pendings [w->pending - 1].events \|= events;
		203	return;
		204	}
		205
116	w->pending = ++pendingcnt;	206	w->pending = ++pendingcnt;
117	array_needsize (pendings, pendingmax, pendingcnt, );	207	array_needsize (pendings, pendingmax, pendingcnt, );
118	pendings [pendingcnt - 1].w = w;	208	pendings [pendingcnt - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	209	pendings [pendingcnt - 1].events = events;
120	}	210	}
121		211
122	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
123	fd_event (int fd, int events)	222	fd_event (int fd, int events)
124	{	223	{
125	ANFD *anfd = anfds + fd;	224	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	225	struct ev_io *w;
127		226
128	for (w = anfd->head; w; w = w->next)	227	for (w = anfd->head; w; w = w->next)
129	{	228	{
130	int ev = w->events & events;	229	int ev = w->events & events;
131		230
132	if (ev)	231	if (ev)
133	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)
134	}	247	{
135	}	248	int fd = fdchanges [i];
		249	ANFD *anfd = anfds + fd;
		250	struct ev_io *w;
136		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;
		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	/*****************************************************************************/
		299
137	static struct ev_timer **atimers;	300	static struct ev_timer **timers;
138	static int atimermax, atimercnt;	301	static int timermax, timercnt;
139		302
140	static struct ev_timer **rtimers;	303	static struct ev_periodic **periodics;
141	static int rtimermax, rtimercnt;	304	static int periodicmax, periodiccnt;
142		305
143	static void	306	static void
144	upheap (struct ev_timer **timers, int k)	307	upheap (WT *timers, int k)
145	{	308	{
146	struct ev_timer *w = timers [k];	309	WT w = timers [k];
147		310
148	while (k && timers [k >> 1]->at > w->at)	311	while (k && timers [k >> 1]->at > w->at)
149	{	312	{
150	timers [k] = timers [k >> 1];	313	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;	314	timers [k]->active = k + 1;
…		…
156	timers [k]->active = k + 1;	319	timers [k]->active = k + 1;
157		320
158	}	321	}
159		322
160	static void	323	static void
161	downheap (struct ev_timer **timers, int N, int k)	324	downheap (WT *timers, int N, int k)
162	{	325	{
163	struct ev_timer *w = timers [k];	326	WT w = timers [k];
164		327
165	while (k < (N >> 1))	328	while (k < (N >> 1))
166	{	329	{
167	int j = k << 1;	330	int j = k << 1;
168		331
…		…
179		342
180	timers [k] = w;	343	timers [k] = w;
181	timers [k]->active = k + 1;	344	timers [k]->active = k + 1;
182	}	345	}
183		346
184	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;
185	static int signalmax;	356	static int signalmax;
186		357
		358	static int sigpipe [2];
		359	static sig_atomic_t volatile gotsig;
		360	static struct ev_io sigev;
		361
187	static void	362	static void
188	signals_init (struct ev_signal **base, int count)	363	signals_init (ANSIG *base, int count)
189	{	364	{
190	while (count--)	365	while (count--)
191	*base++ = 0;	366	{
192	}	367	base->head = 0;
		368	base->gotsig = 0;
193		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
194	#if HAVE_EPOLL	456	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	457	# include "ev_epoll.c"
196	#endif	458	#endif
197	#if HAVE_SELECT	459	#if EV_USE_SELECT
198	# include "ev_select.c"	460	# include "ev_select.c"
199	#endif	461	#endif
200		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
201	int ev_init (int flags)	475	int ev_init (int flags)
202	{	476	{
		477	if (!ev_method)
		478	{
203	#if HAVE_MONOTONIC	479	#if EV_USE_MONOTONIC
204	{	480	{
205	struct timespec ts;	481	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	482	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	483	have_monotonic = 1;
208	}	484	}
209	#endif	485	#endif
210		486
211	ev_now = ev_time ();	487	ev_now = ev_time ();
212	now = get_clock ();	488	now = get_clock ();
		489	now_floor = now;
213	diff = ev_now - now;	490	diff = ev_now - now;
214		491
215	#if HAVE_EPOLL	492	if (pipe (sigpipe))
216	if (epoll_init (flags))	493	return 0;
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223		494
224	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
225	return ev_method;	513	return ev_method;
226	}	514	}
227		515
228	void ev_prefork (void)	516	/*****************************************************************************/
229	{
230	}
231		517
		518	void
		519	ev_fork_prepare (void)
		520	{
		521	/* nop */
		522	}
		523
		524	void
232	void ev_postfork_parent (void)	525	ev_fork_parent (void)
233	{	526	{
		527	/* nop */
234	}	528	}
235		529
		530	void
236	void ev_postfork_child (void)	531	ev_fork_child (void)
237	{	532	{
238	#if HAVE_EPOLL	533	#if EV_USE_EPOLL
		534	if (ev_method == EVMETHOD_EPOLL)
239	epoll_postfork_child ();	535	epoll_postfork_child ();
240	#endif	536	#endif
241	}
242		537
		538	ev_io_stop (&sigev);
		539	close (sigpipe [0]);
		540	close (sigpipe [1]);
		541	pipe (sigpipe);
		542	siginit ();
		543	}
		544
		545	/*****************************************************************************/
		546
243	static void	547	static void
244	call_pending ()	548	call_pending (void)
245	{	549	{
246	int i;	550	while (pendingcnt)
247
248	for (i = 0; i < pendingcnt; ++i)
249	{	551	{
250	ANPENDING *p = pendings + i;	552	ANPENDING *p = pendings + --pendingcnt;
251		553
252	if (p->w)	554	if (p->w)
253	{	555	{
254	p->w->pending = 0;	556	p->w->pending = 0;
255	p->w->cb (p->w, p->events);	557	p->w->cb (p->w, p->events);
256	}	558	}
257	}	559	}
258
259	pendingcnt = 0;
260	}	560	}
261		561
262	static void	562	static void
263	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	563	timers_reify (void)
264	{	564	{
265	while (timercnt && timers [0]->at <= now)	565	while (timercnt && timers [0]->at <= now)
266	{	566	{
267	struct ev_timer *w = timers [0];	567	struct ev_timer *w = timers [0];
268		568
269	/* first reschedule or stop timer */	569	/* first reschedule or stop timer */
270	if (w->repeat)	570	if (w->repeat)
271	{	571	{
272	if (w->is_abs)	572	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;	573	w->at = now + w->repeat;
276
277	assert (w->at > now);
278
279	downheap (timers, timercnt, 0);	574	downheap ((WT *)timers, timercnt, 0);
280	}	575	}
281	else	576	else
282	{
283	evtimer_stop (w); /* nonrepeating: stop timer */	577	ev_timer_stop (w); /* nonrepeating: stop timer */
284	--timercnt; /* maybe pass by reference instead? */	578
		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)
285	}	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 */
286		599
287	event ((struct ev_watcher *)w, EV_TIMEOUT);	600	event ((W)w, EV_PERIODIC);
288	}	601	}
289	}	602	}
290		603
291	static void	604	static void
292	time_update ()	605	periodics_reschedule (ev_tstamp diff)
293	{	606	{
294	int i;	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;
295	ev_now = ev_time ();	642	ev_now = ev_time ();
296		643	return 1;
297	if (have_monotonic)
298	{	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	{
299	ev_tstamp odiff = diff;	657	ev_tstamp odiff = diff;
300		658
301	/* detecting time jumps is much more difficult */
302	for (i = 2; --i; ) /* loop a few times, before making important decisions */	659	for (i = 4; --i; ) /* loop a few times, before making important decisions */
303	{	660	{
304	now = get_clock ();
305	diff = ev_now - now;	661	diff = ev_now - now;
306		662
307	if (fabs (odiff - diff) < MIN_TIMEJUMP)	663	if (fabs (odiff - diff) < MIN_TIMEJUMP)
308	return; /* all is well */	664	return; /* all is well */
309		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;
		690	}
		691	}
		692
		693	int ev_loop_done;
		694
		695	void ev_loop (int flags)
		696	{
		697	double block;
		698	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
		699
		700	do
		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
		709	/* update fd-related kernel structures */
		710	fd_reify ();
		711
		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	{
310	ev_now = ev_time ();	722	ev_now = ev_time ();
311	}	723	now = ev_now;
312
313	/* time jump detected, reschedule atimers */
314	for (i = 0; i < atimercnt; ++i)
315	{	724	}
316	struct ev_timer *w = atimers [i];
317	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
318	}
319	}
320	else
321	{
322	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
323	/* time jump detected, adjust rtimers */
324	for (i = 0; i < rtimercnt; ++i)
325	rtimers [i]->at += ev_now - now;
326		725
327	now = ev_now;
328	}
329	}
330
331	int ev_loop_done;
332
333	void ev_loop (int flags)
334	{
335	double block;
336	ev_loop_done = flags & EVLOOP_ONESHOT;
337
338	do
339	{
340	/* update fd-related kernel structures */
341	method_reify (); fdchangecnt = 0;
342
343	/* calculate blocking time */
344	if (flags & EVLOOP_NONBLOCK)	726	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
345	block = 0.;	727	block = 0.;
346	else	728	else
347	{	729	{
348	block = MAX_BLOCKTIME;	730	block = MAX_BLOCKTIME;
349		731
350	if (rtimercnt)	732	if (timercnt)
351	{	733	{
352	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	734	ev_tstamp to = timers [0]->at - now + method_fudge;
353	if (block > to) block = to;	735	if (block > to) block = to;
354	}	736	}
355		737
356	if (atimercnt)	738	if (periodiccnt)
357	{	739	{
358	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	740	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
359	if (block > to) block = to;	741	if (block > to) block = to;
360	}	742	}
361		743
362	if (block < 0.) block = 0.;	744	if (block < 0.) block = 0.;
363	}	745	}
…		…
365	method_poll (block);	747	method_poll (block);
366		748
367	/* update ev_now, do magic */	749	/* update ev_now, do magic */
368	time_update ();	750	time_update ();
369		751
370	/* put pending timers into pendign queue and reschedule them */	752	/* queue pending timers and reschedule them */
371	/* absolute timers first */	753	timers_reify (); /* relative timers called last */
372	timers_reify (atimers, atimercnt, ev_now);	754	periodics_reify (); /* absolute timers called first */
373	/* relative timers second */	755
374	timers_reify (rtimers, rtimercnt, now);	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);
375		763
376	call_pending ();	764	call_pending ();
377	}	765	}
378	while (!ev_loop_done);	766	while (!ev_loop_done);
379	}
380		767
		768	if (ev_loop_done != 2)
		769	ev_loop_done = 0;
		770	}
		771
		772	/*****************************************************************************/
		773
381	static void	774	static void
382	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	775	wlist_add (WL *head, WL elem)
383	{	776	{
384	elem->next = *head;	777	elem->next = *head;
385	*head = elem;	778	*head = elem;
386	}	779	}
387		780
388	static void	781	static void
389	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	782	wlist_del (WL *head, WL elem)
390	{	783	{
391	while (*head)	784	while (*head)
392	{	785	{
393	if (*head == elem)	786	if (*head == elem)
394	{	787	{
…		…
399	head = &(*head)->next;	792	head = &(*head)->next;
400	}	793	}
401	}	794	}
402		795
403	static void	796	static void
404	ev_start (struct ev_watcher *w, int active)	797	ev_clear_pending (W w)
405	{	798	{
		799	if (w->pending)
		800	{
		801	pendings [w->pending - 1].w = 0;
406	w->pending = 0;	802	w->pending = 0;
		803	}
		804	}
		805
		806	static void
		807	ev_start (W w, int active)
		808	{
407	w->active = active;	809	w->active = active;
408	}	810	}
409		811
410	static void	812	static void
411	ev_stop (struct ev_watcher *w)	813	ev_stop (W w)
412	{	814	{
413	if (w->pending)
414	pendings [w->pending - 1].w = 0;
415
416	w->active = 0;	815	w->active = 0;
417	/* nop */
418	}	816	}
419		817
		818	/*****************************************************************************/
		819
420	void	820	void
421	evio_start (struct ev_io *w)	821	ev_io_start (struct ev_io *w)
422	{	822	{
		823	int fd = w->fd;
		824
423	if (ev_is_active (w))	825	if (ev_is_active (w))
424	return;	826	return;
425		827
426	int fd = w->fd;	828	assert (("ev_io_start called with negative fd", fd >= 0));
427		829
428	ev_start ((struct ev_watcher *)w, 1);	830	ev_start ((W)w, 1);
429	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	831	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
430	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	832	wlist_add ((WL *)&anfds[fd].head, (WL)w);
431		833
432	++fdchangecnt;	834	fd_change (fd);
433	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
434	fdchanges [fdchangecnt - 1] = fd;
435	}	835	}
436		836
437	void	837	void
438	evio_stop (struct ev_io *w)	838	ev_io_stop (struct ev_io *w)
439	{	839	{
		840	ev_clear_pending ((W)w);
440	if (!ev_is_active (w))	841	if (!ev_is_active (w))
441	return;	842	return;
442		843
443	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);
444	ev_stop ((struct ev_watcher *)w);	845	ev_stop ((W)w);
445		846
446	++fdchangecnt;	847	fd_change (w->fd);
447	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
448	fdchanges [fdchangecnt - 1] = w->fd;
449	}	848	}
450		849
451	void	850	void
452	evtimer_start (struct ev_timer *w)	851	ev_timer_start (struct ev_timer *w)
453	{	852	{
454	if (ev_is_active (w))	853	if (ev_is_active (w))
455	return;	854	return;
456		855
457	if (w->is_abs)	856	w->at += now;
		857
		858	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		859
		860	ev_start ((W)w, ++timercnt);
		861	array_needsize (timers, timermax, timercnt, );
		862	timers [timercnt - 1] = w;
		863	upheap ((WT *)timers, timercnt - 1);
		864	}
		865
		866	void
		867	ev_timer_stop (struct ev_timer *w)
		868	{
		869	ev_clear_pending ((W)w);
		870	if (!ev_is_active (w))
		871	return;
		872
		873	if (w->active < timercnt--)
		874	{
		875	timers [w->active - 1] = timers [timercnt];
		876	downheap ((WT *)timers, timercnt, w->active - 1);
458	{	877	}
459	/* this formula differs from the one in timer_reify becuse we do not round up */	878
		879	w->at = w->repeat;
		880
		881	ev_stop ((W)w);
		882	}
		883
		884	void
		885	ev_timer_again (struct ev_timer *w)
		886	{
		887	if (ev_is_active (w))
		888	{
460	if (w->repeat)	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	}
		900
		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)
461	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	911	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
462		912
463	ev_start ((struct ev_watcher *)w, ++atimercnt);	913	ev_start ((W)w, ++periodiccnt);
464	array_needsize (atimers, atimermax, atimercnt, );	914	array_needsize (periodics, periodicmax, periodiccnt, );
465	atimers [atimercnt - 1] = w;	915	periodics [periodiccnt - 1] = w;
466	upheap (atimers, atimercnt - 1);	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--)
467	}	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);
		944	array_needsize (signals, signalmax, w->signum, signals_init);
		945	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		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
		957	void
		958	ev_signal_stop (struct ev_signal *w)
		959	{
		960	ev_clear_pending ((W)w);
		961	if (!ev_is_active (w))
		962	return;
		963
		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
		1027	ev_check_stop (struct ev_check *w)
		1028	{
		1029	ev_clear_pending ((W)w);
		1030	if (ev_is_active (w))
		1031	return;
		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
		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);
468	else	1100	else
469	{	1101	{
470	w->at += now;	1102	once->cb = cb;
		1103	once->arg = arg;
471		1104
472	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1105	ev_watcher_init (&once->io, once_cb_io);
473	array_needsize (rtimers, rtimermax, rtimercnt, );	1106	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	}	1107	{
493	}	1108	ev_io_set (&once->io, fd, events);
494	else	1109	ev_io_start (&once->io);
495	{
496	if (w->active < rtimercnt--)
497	{	1110	}
498	rtimers [w->active - 1] = rtimers [rtimercnt];	1111
499	downheap (rtimers, rtimercnt, w->active - 1);	1112	ev_watcher_init (&once->to, once_cb_to);
		1113	if (timeout >= 0.)
500	}	1114	{
		1115	ev_timer_set (&once->to, timeout, 0.);
		1116	ev_timer_start (&once->to);
		1117	}
501	}	1118	}
502
503	ev_stop ((struct ev_watcher *)w);
504	}	1119	}
505		1120
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	/*****************************************************************************/	1121	/*****************************************************************************/
		1122
528	#if 1	1123	#if 0
		1124
		1125	struct ev_io wio;
529		1126
530	static void	1127	static void
531	sin_cb (struct ev_io *w, int revents)	1128	sin_cb (struct ev_io *w, int revents)
532	{	1129	{
533	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1130	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
535		1132
536	static void	1133	static void
537	ocb (struct ev_timer *w, int revents)	1134	ocb (struct ev_timer *w, int revents)
538	{	1135	{
539	//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);
540	evtimer_stop (w);	1137	ev_timer_stop (w);
541	evtimer_start (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
542	}	1154	}
543		1155
544	int main (void)	1156	int main (void)
545	{	1157	{
546	struct ev_io sin;
547
548	ev_init (0);	1158	ev_init (0);
549		1159
550	evw_init (&sin, sin_cb, 55);
551	evio_set (&sin, 0, EV_READ);	1160	ev_io_init (&wio, sin_cb, 0, EV_READ);
552	evio_start (&sin);	1161	ev_io_start (&wio);
553		1162
554	struct ev_timer t[10000];	1163	struct ev_timer t[10000];
555		1164
556	#if 1	1165	#if 0
557	int i;	1166	int i;
558	for (i = 0; i < 10000; ++i)	1167	for (i = 0; i < 10000; ++i)
559	{	1168	{
560	struct ev_timer *w = t + i;	1169	struct ev_timer *w = t + i;
561	evw_init (w, ocb, i);	1170	ev_watcher_init (w, ocb, i);
562	evtimer_set_abs (w, drand48 (), 0.99775533);	1171	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
563	evtimer_start (w);	1172	ev_timer_start (w);
564	if (drand48 () < 0.5)	1173	if (drand48 () < 0.5)
565	evtimer_stop (w);	1174	ev_timer_stop (w);
566	}	1175	}
567	#endif	1176	#endif
568		1177
569	struct ev_timer t1;	1178	struct ev_timer t1;
570	evw_init (&t1, ocb, 0);	1179	ev_timer_init (&t1, ocb, 5, 10);
571	evtimer_set_abs (&t1, 5, 10);
572	evtimer_start (&t1);	1180	ev_timer_start (&t1);
		1181
		1182	struct ev_signal sig;
		1183	ev_signal_init (&sig, scb, SIGQUIT);
		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);
		1192	ev_idle_start (&iw);
573		1193
574	ev_loop (0);	1194	ev_loop (0);
575		1195
576	return 0;	1196	return 0;
577	}	1197	}

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Comparing libev/ev.c (file contents): Revision 1.4 by root, Tue Oct 30 23:10:33 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 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.40 by root, Fri Nov 2 11:02:23 2007 UTC