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

Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.30 by root, Thu Nov 1 08:28:33 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
6	#include <assert.h>	42	#include <assert.h>
7	#include <errno.h>	43	#include <errno.h>
		44	#include <sys/types.h>
		45	#include <sys/wait.h>
8	#include <sys/time.h>	46	#include <sys/time.h>
9	#include <time.h>	47	#include <time.h>
10		48
		49	#ifndef EV_USE_MONOTONIC
11	#ifdef CLOCK_MONOTONIC	50	# ifdef CLOCK_MONOTONIC
12	# define HAVE_MONOTONIC 1	51	# define EV_USE_MONOTONIC 1
13	#endif	52	# endif
		53	#endif
14		54
15	#define HAVE_EPOLL 1	55	#ifndef EV_USE_SELECT
16	#define HAVE_REALTIME 1
17	#define HAVE_SELECT 1	56	# define EV_USE_SELECT 1
		57	#endif
		58
		59	#ifndef EV_USE_EPOLL
		60	# define EV_USE_EPOLL 0
		61	#endif
		62
		63	#ifndef EV_USE_REALTIME
		64	# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */
		65	#endif
18		66
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	67	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	68	#define MAX_BLOCKTIME 59.731
		69	#define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */
21		70
22	#include "ev.h"	71	#include "ev.h"
23		72
24	struct ev_watcher {	73	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	74	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	75	typedef struct ev_watcher_time *WT;
30	};
31		76
32	static ev_tstamp now, diff; /* monotonic clock */	77	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	78	ev_tstamp ev_now;
34	int ev_method;	79	int ev_method;
35		80
37		82
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	83	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
39	static void (*method_modify)(int fd, int oev, int nev);	84	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);	85	static void (*method_poll)(ev_tstamp timeout);
41		86
		87	/*****************************************************************************/
		88
42	ev_tstamp	89	ev_tstamp
43	ev_time (void)	90	ev_time (void)
44	{	91	{
45	#if HAVE_REALTIME	92	#if EV_USE_REALTIME
46	struct timespec ts;	93	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	94	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	95	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	96	#else
50	struct timeval tv;	97	struct timeval tv;
…		…
54	}	101	}
55		102
56	static ev_tstamp	103	static ev_tstamp
57	get_clock (void)	104	get_clock (void)
58	{	105	{
59	#if HAVE_MONOTONIC	106	#if EV_USE_MONOTONIC
60	if (have_monotonic)	107	if (have_monotonic)
61	{	108	{
62	struct timespec ts;	109	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	110	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	111	return ts.tv_sec + ts.tv_nsec * 1e-9;
…		…
66	#endif	113	#endif
67		114
68	return ev_time ();	115	return ev_time ();
69	}	116	}
70		117
		118	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		119
71	#define array_needsize(base,cur,cnt,init) \	120	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	121	if ((cnt) > cur) \
73	{ \	122	{ \
74	int newcnt = cur ? cur << 1 : 16; \	123	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	124	do \
		125	{ \
		126	newcnt = array_roundsize (base, newcnt << 1); \
		127	} \
		128	while ((cnt) > newcnt); \
		129	\
76	base = realloc (base, sizeof (base) (newcnt)); \	130	base = realloc (base, sizeof (base) (newcnt)); \
77	init (base + cur, newcnt - cur); \	131	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	132	cur = newcnt; \
79	}	133	}
80		134
		135	/*****************************************************************************/
		136
81	typedef struct	137	typedef struct
82	{	138	{
83	struct ev_io *head;	139	struct ev_io *head;
84	unsigned char wev, rev; /* want, received event set */	140	int events;
85	} ANFD;	141	} ANFD;
86		142
87	static ANFD *anfds;	143	static ANFD *anfds;
88	static int anfdmax;	144	static int anfdmax;
89		145
90	static int *fdchanges;
91	static int fdchangemax, fdchangecnt;
92
93	static void	146	static void
94	anfds_init (ANFD *base, int count)	147	anfds_init (ANFD *base, int count)
95	{	148	{
96	while (count--)	149	while (count--)
97	{	150	{
98	base->head = 0;	151	base->head = 0;
99	base->wev = base->rev = EV_NONE;	152	base->events = EV_NONE;
100	++base;	153	++base;
101	}	154	}
102	}	155	}
103		156
104	typedef struct	157	typedef struct
105	{	158	{
106	struct ev_watcher *w;	159	W w;
107	int events;	160	int events;
108	} ANPENDING;	161	} ANPENDING;
109		162
110	static ANPENDING *pendings;	163	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;	164	static int pendingmax, pendingcnt;
112		165
113	static void	166	static void
114	event (struct ev_watcher *w, int events)	167	event (W w, int events)
115	{	168	{
116	w->pending = ++pendingcnt;	169	w->pending = ++pendingcnt;
117	array_needsize (pendings, pendingmax, pendingcnt, );	170	array_needsize (pendings, pendingmax, pendingcnt, );
118	pendings [pendingcnt - 1].w = w;	171	pendings [pendingcnt - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	172	pendings [pendingcnt - 1].events = events;
120	}	173	}
121		174
122	static void	175	static void
		176	queue_events (W *events, int eventcnt, int type)
		177	{
		178	int i;
		179
		180	for (i = 0; i < eventcnt; ++i)
		181	event (events [i], type);
		182	}
		183
		184	static void
123	fd_event (int fd, int events)	185	fd_event (int fd, int events)
124	{	186	{
125	ANFD *anfd = anfds + fd;	187	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	188	struct ev_io *w;
127		189
128	for (w = anfd->head; w; w = w->next)	190	for (w = anfd->head; w; w = w->next)
129	{	191	{
130	int ev = w->events & events;	192	int ev = w->events & events;
131		193
132	if (ev)	194	if (ev)
133	event ((struct ev_watcher *)w, ev);	195	event ((W)w, ev);
		196	}
		197	}
		198
		199	/*****************************************************************************/
		200
		201	static int *fdchanges;
		202	static int fdchangemax, fdchangecnt;
		203
		204	static void
		205	fd_reify (void)
		206	{
		207	int i;
		208
		209	for (i = 0; i < fdchangecnt; ++i)
134	}	210	{
135	}	211	int fd = fdchanges [i];
		212	ANFD *anfd = anfds + fd;
		213	struct ev_io *w;
136		214
		215	int events = 0;
		216
		217	for (w = anfd->head; w; w = w->next)
		218	events \|= w->events;
		219
		220	anfd->events &= ~EV_REIFY;
		221
		222	if (anfd->events != events)
		223	{
		224	method_modify (fd, anfd->events, events);
		225	anfd->events = events;
		226	}
		227	}
		228
		229	fdchangecnt = 0;
		230	}
		231
		232	static void
		233	fd_change (int fd)
		234	{
		235	if (anfds [fd].events & EV_REIFY \|\| fdchangecnt < 0)
		236	return;
		237
		238	anfds [fd].events \|= EV_REIFY;
		239
		240	++fdchangecnt;
		241	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		242	fdchanges [fdchangecnt - 1] = fd;
		243	}
		244
		245	/* called on EBADF to verify fds */
		246	static void
		247	fd_recheck (void)
		248	{
		249	int fd;
		250
		251	for (fd = 0; fd < anfdmax; ++fd)
		252	if (anfds [fd].events)
		253	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		254	while (anfds [fd].head)
		255	{
		256	event ((W)anfds [fd].head, EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT);
		257	ev_io_stop (anfds [fd].head);
		258	}
		259	}
		260
		261	/*****************************************************************************/
		262
137	static struct ev_timer **atimers;	263	static struct ev_timer **timers;
138	static int atimermax, atimercnt;	264	static int timermax, timercnt;
139		265
140	static struct ev_timer **rtimers;	266	static struct ev_periodic **periodics;
141	static int rtimermax, rtimercnt;	267	static int periodicmax, periodiccnt;
142		268
143	static void	269	static void
144	upheap (struct ev_timer **timers, int k)	270	upheap (WT *timers, int k)
145	{	271	{
146	struct ev_timer *w = timers [k];	272	WT w = timers [k];
147		273
148	while (k && timers [k >> 1]->at > w->at)	274	while (k && timers [k >> 1]->at > w->at)
149	{	275	{
150	timers [k] = timers [k >> 1];	276	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;	277	timers [k]->active = k + 1;
…		…
156	timers [k]->active = k + 1;	282	timers [k]->active = k + 1;
157		283
158	}	284	}
159		285
160	static void	286	static void
161	downheap (struct ev_timer **timers, int N, int k)	287	downheap (WT *timers, int N, int k)
162	{	288	{
163	struct ev_timer *w = timers [k];	289	WT w = timers [k];
164		290
165	while (k < (N >> 1))	291	while (k < (N >> 1))
166	{	292	{
167	int j = k << 1;	293	int j = k << 1;
168		294
…		…
179		305
180	timers [k] = w;	306	timers [k] = w;
181	timers [k]->active = k + 1;	307	timers [k]->active = k + 1;
182	}	308	}
183		309
184	static struct ev_signal **signals;	310	/*****************************************************************************/
		311
		312	typedef struct
		313	{
		314	struct ev_signal *head;
		315	sig_atomic_t gotsig;
		316	} ANSIG;
		317
		318	static ANSIG *signals;
185	static int signalmax;	319	static int signalmax;
186		320
		321	static int sigpipe [2];
		322	static sig_atomic_t gotsig;
		323	static struct ev_io sigev;
		324
187	static void	325	static void
188	signals_init (struct ev_signal **base, int count)	326	signals_init (ANSIG *base, int count)
189	{	327	{
190	while (count--)	328	while (count--)
191	*base++ = 0;	329	{
		330	base->head = 0;
		331	base->gotsig = 0;
		332	++base;
		333	}
192	}	334	}
193		335
		336	static void
		337	sighandler (int signum)
		338	{
		339	signals [signum - 1].gotsig = 1;
		340
		341	if (!gotsig)
		342	{
		343	gotsig = 1;
		344	write (sigpipe [1], &gotsig, 1);
		345	}
		346	}
		347
		348	static void
		349	sigcb (struct ev_io *iow, int revents)
		350	{
		351	struct ev_signal *w;
		352	int sig;
		353
		354	gotsig = 0;
		355	read (sigpipe [0], &revents, 1);
		356
		357	for (sig = signalmax; sig--; )
		358	if (signals [sig].gotsig)
		359	{
		360	signals [sig].gotsig = 0;
		361
		362	for (w = signals [sig].head; w; w = w->next)
		363	event ((W)w, EV_SIGNAL);
		364	}
		365	}
		366
		367	static void
		368	siginit (void)
		369	{
		370	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		371	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		372
		373	/* rather than sort out wether we really need nb, set it */
		374	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		375	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		376
		377	ev_io_set (&sigev, sigpipe [0], EV_READ);
		378	ev_io_start (&sigev);
		379	}
		380
		381	/*****************************************************************************/
		382
		383	static struct ev_idle **idles;
		384	static int idlemax, idlecnt;
		385
		386	static struct ev_prepare **prepares;
		387	static int preparemax, preparecnt;
		388
		389	static struct ev_check **checks;
		390	static int checkmax, checkcnt;
		391
		392	/*****************************************************************************/
		393
		394	static struct ev_child *childs [PID_HASHSIZE];
		395	static struct ev_signal childev;
		396
		397	#ifndef WCONTINUED
		398	# define WCONTINUED 0
		399	#endif
		400
		401	static void
		402	childcb (struct ev_signal *sw, int revents)
		403	{
		404	struct ev_child *w;
		405	int pid, status;
		406
		407	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		408	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		409	if (w->pid == pid \|\| w->pid == -1)
		410	{
		411	w->status = status;
		412	event ((W)w, EV_CHILD);
		413	}
		414	}
		415
		416	/*****************************************************************************/
		417
194	#if HAVE_EPOLL	418	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	419	# include "ev_epoll.c"
196	#endif	420	#endif
197	#if HAVE_SELECT	421	#if EV_USE_SELECT
198	# include "ev_select.c"	422	# include "ev_select.c"
199	#endif	423	#endif
200		424
		425	int
		426	ev_version_major (void)
		427	{
		428	return EV_VERSION_MAJOR;
		429	}
		430
		431	int
		432	ev_version_minor (void)
		433	{
		434	return EV_VERSION_MINOR;
		435	}
		436
201	int ev_init (int flags)	437	int ev_init (int flags)
202	{	438	{
		439	if (!ev_method)
		440	{
203	#if HAVE_MONOTONIC	441	#if EV_USE_MONOTONIC
204	{	442	{
205	struct timespec ts;	443	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	444	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	445	have_monotonic = 1;
208	}	446	}
209	#endif	447	#endif
210		448
211	ev_now = ev_time ();	449	ev_now = ev_time ();
212	now = get_clock ();	450	now = get_clock ();
213	diff = ev_now - now;	451	diff = ev_now - now;
214		452
215	#if HAVE_EPOLL	453	if (pipe (sigpipe))
216	if (epoll_init (flags))	454	return 0;
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223		455
224	ev_method = EVMETHOD_NONE;	456	ev_method = EVMETHOD_NONE;
		457	#if EV_USE_EPOLL
		458	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
		459	#endif
		460	#if EV_USE_SELECT
		461	if (ev_method == EVMETHOD_NONE) select_init (flags);
		462	#endif
		463
		464	if (ev_method)
		465	{
		466	ev_watcher_init (&sigev, sigcb);
		467	siginit ();
		468
		469	ev_signal_init (&childev, childcb, SIGCHLD);
		470	ev_signal_start (&childev);
		471	}
		472	}
		473
225	return ev_method;	474	return ev_method;
226	}	475	}
227		476
		477	/*****************************************************************************/
		478
		479	void
228	void ev_prefork (void)	480	ev_prefork (void)
229	{	481	{
		482	/* nop */
230	}	483	}
231		484
		485	void
232	void ev_postfork_parent (void)	486	ev_postfork_parent (void)
233	{	487	{
		488	/* nop */
234	}	489	}
235		490
		491	void
236	void ev_postfork_child (void)	492	ev_postfork_child (void)
237	{	493	{
238	#if HAVE_EPOLL	494	#if EV_USE_EPOLL
239	if (ev_method == EVMETHOD_EPOLL)	495	if (ev_method == EVMETHOD_EPOLL)
240	epoll_postfork_child ();	496	epoll_postfork_child ();
241	#endif	497	#endif
242	}
243		498
244	static void	499	ev_io_stop (&sigev);
245	fd_reify (void)	500	close (sigpipe [0]);
246	{	501	close (sigpipe [1]);
247	int i;	502	pipe (sigpipe);
248		503	siginit ();
249	for (i = 0; i < fdchangecnt; ++i)
250	{
251	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;
253	struct ev_io *w;
254
255	int wev = 0;
256
257	for (w = anfd->head; w; w = w->next)
258	wev \|= w->events;
259
260	if (anfd->wev != wev)
261	{
262	method_modify (fd, anfd->wev, wev);
263	anfd->wev = wev;
264	}
265	}
266
267	fdchangecnt = 0;
268	}	504	}
269		505
		506	/*****************************************************************************/
		507
270	static void	508	static void
271	call_pending ()	509	call_pending (void)
272	{	510	{
273	int i;	511	while (pendingcnt)
274
275	for (i = 0; i < pendingcnt; ++i)
276	{	512	{
277	ANPENDING *p = pendings + i;	513	ANPENDING *p = pendings + --pendingcnt;
278		514
279	if (p->w)	515	if (p->w)
280	{	516	{
281	p->w->pending = 0;	517	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	518	p->w->cb (p->w, p->events);
283	}	519	}
284	}	520	}
285
286	pendingcnt = 0;
287	}	521	}
288		522
289	static void	523	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	524	timers_reify (void)
291	{	525	{
292	while (timercnt && timers [0]->at <= now)	526	while (timercnt && timers [0]->at <= now)
293	{	527	{
294	struct ev_timer *w = timers [0];	528	struct ev_timer *w = timers [0];
295		529
296	/* first reschedule or stop timer */	530	/* first reschedule or stop timer */
297	if (w->repeat)	531	if (w->repeat)
298	{	532	{
299	if (w->is_abs)
300	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
301	else
302	w->at = now + w->repeat;	533	w->at = now + w->repeat;
303		534	assert (("timer timeout in the past, negative repeat?", w->at > now));
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	535	downheap ((WT *)timers, timercnt, 0);
307	}	536	}
308	else	537	else
309	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	538	ev_timer_stop (w); /* nonrepeating: stop timer */
311	--timercnt; /* maybe pass by reference instead? */	539
		540	event ((W)w, EV_TIMEOUT);
		541	}
		542	}
		543
		544	static void
		545	periodics_reify (void)
		546	{
		547	while (periodiccnt && periodics [0]->at <= ev_now)
		548	{
		549	struct ev_periodic *w = periodics [0];
		550
		551	/* first reschedule or stop timer */
		552	if (w->interval)
312	}	553	{
		554	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		555	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
		556	downheap ((WT *)periodics, periodiccnt, 0);
		557	}
		558	else
		559	ev_periodic_stop (w); /* nonrepeating: stop timer */
313		560
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	561	event ((W)w, EV_TIMEOUT);
315	}	562	}
316	}	563	}
317		564
318	static void	565	static void
319	time_update ()	566	periodics_reschedule (ev_tstamp diff)
320	{	567	{
321	int i;	568	int i;
		569
		570	/* adjust periodics after time jump */
		571	for (i = 0; i < periodiccnt; ++i)
		572	{
		573	struct ev_periodic *w = periodics [i];
		574
		575	if (w->interval)
		576	{
		577	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		578
		579	if (fabs (diff) >= 1e-4)
		580	{
		581	ev_periodic_stop (w);
		582	ev_periodic_start (w);
		583
		584	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		585	}
		586	}
		587	}
		588	}
		589
		590	static void
		591	time_update (void)
		592	{
		593	int i;
		594
322	ev_now = ev_time ();	595	ev_now = ev_time ();
323		596
324	if (have_monotonic)	597	if (have_monotonic)
325	{	598	{
326	ev_tstamp odiff = diff;	599	ev_tstamp odiff = diff;
327		600
328	/* detecting time jumps is much more difficult */
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	601	for (i = 4; --i; ) /* loop a few times, before making important decisions */
330	{	602	{
331	now = get_clock ();	603	now = get_clock ();
332	diff = ev_now - now;	604	diff = ev_now - now;
333		605
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	606	if (fabs (odiff - diff) < MIN_TIMEJUMP)
335	return; /* all is well */	607	return; /* all is well */
336		608
337	ev_now = ev_time ();	609	ev_now = ev_time ();
338	}	610	}
339		611
340	/* time jump detected, reschedule atimers */	612	periodics_reschedule (diff - odiff);
341	for (i = 0; i < atimercnt; ++i)	613	/* no timer adjustment, as the monotonic clock doesn't jump */
342	{
343	struct ev_timer *w = atimers [i];
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
345	}
346	}	614	}
347	else	615	else
348	{	616	{
349	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	617	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
350	/* time jump detected, adjust rtimers */	618	{
		619	periodics_reschedule (ev_now - now);
		620
		621	/* adjust timers. this is easy, as the offset is the same for all */
351	for (i = 0; i < rtimercnt; ++i)	622	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	623	timers [i]->at += diff;
		624	}
353		625
354	now = ev_now;	626	now = ev_now;
355	}	627	}
356	}	628	}
357		629
358	int ev_loop_done;	630	int ev_loop_done;
359		631
360	void ev_loop (int flags)	632	void ev_loop (int flags)
361	{	633	{
362	double block;	634	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	635	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
364		636
365	do	637	do
366	{	638	{
		639	/* queue check watchers (and execute them) */
		640	if (preparecnt)
		641	{
		642	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		643	call_pending ();
		644	}
		645
367	/* update fd-related kernel structures */	646	/* update fd-related kernel structures */
368	fd_reify ();	647	fd_reify ();
369		648
370	/* calculate blocking time */	649	/* calculate blocking time */
		650
		651	/* we only need this for !monotonic clockor timers, but as we basically
		652	always have timers, we just calculate it always */
		653	ev_now = ev_time ();
		654
371	if (flags & EVLOOP_NONBLOCK)	655	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
372	block = 0.;	656	block = 0.;
373	else	657	else
374	{	658	{
375	block = MAX_BLOCKTIME;	659	block = MAX_BLOCKTIME;
376		660
377	if (rtimercnt)	661	if (timercnt)
378	{	662	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	663	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
380	if (block > to) block = to;	664	if (block > to) block = to;
381	}	665	}
382		666
383	if (atimercnt)	667	if (periodiccnt)
384	{	668	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	669	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
386	if (block > to) block = to;	670	if (block > to) block = to;
387	}	671	}
388		672
389	if (block < 0.) block = 0.;	673	if (block < 0.) block = 0.;
390	}	674	}
…		…
392	method_poll (block);	676	method_poll (block);
393		677
394	/* update ev_now, do magic */	678	/* update ev_now, do magic */
395	time_update ();	679	time_update ();
396		680
397	/* put pending timers into pendign queue and reschedule them */	681	/* queue pending timers and reschedule them */
398	/* absolute timers first */	682	timers_reify (); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	683	periodics_reify (); /* absolute timers called first */
400	/* relative timers second */	684
401	timers_reify (rtimers, rtimercnt, now);	685	/* queue idle watchers unless io or timers are pending */
		686	if (!pendingcnt)
		687	queue_events ((W *)idles, idlecnt, EV_IDLE);
		688
		689	/* queue check watchers, to be executed first */
		690	if (checkcnt)
		691	queue_events ((W *)checks, checkcnt, EV_CHECK);
402		692
403	call_pending ();	693	call_pending ();
404	}	694	}
405	while (!ev_loop_done);	695	while (!ev_loop_done);
406	}
407		696
		697	if (ev_loop_done != 2)
		698	ev_loop_done = 0;
		699	}
		700
		701	/*****************************************************************************/
		702
408	static void	703	static void
409	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	704	wlist_add (WL *head, WL elem)
410	{	705	{
411	elem->next = *head;	706	elem->next = *head;
412	*head = elem;	707	*head = elem;
413	}	708	}
414		709
415	static void	710	static void
416	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	711	wlist_del (WL *head, WL elem)
417	{	712	{
418	while (*head)	713	while (*head)
419	{	714	{
420	if (*head == elem)	715	if (*head == elem)
421	{	716	{
…		…
426	head = &(*head)->next;	721	head = &(*head)->next;
427	}	722	}
428	}	723	}
429		724
430	static void	725	static void
431	ev_start (struct ev_watcher *w, int active)	726	ev_clear (W w)
432	{	727	{
		728	if (w->pending)
		729	{
		730	pendings [w->pending - 1].w = 0;
433	w->pending = 0;	731	w->pending = 0;
		732	}
		733	}
		734
		735	static void
		736	ev_start (W w, int active)
		737	{
434	w->active = active;	738	w->active = active;
435	}	739	}
436		740
437	static void	741	static void
438	ev_stop (struct ev_watcher *w)	742	ev_stop (W w)
439	{	743	{
440	if (w->pending)
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	744	w->active = 0;
444	/* nop */
445	}	745	}
446		746
		747	/*****************************************************************************/
		748
447	void	749	void
448	evio_start (struct ev_io *w)	750	ev_io_start (struct ev_io *w)
449	{	751	{
450	if (ev_is_active (w))	752	if (ev_is_active (w))
451	return;	753	return;
452		754
453	int fd = w->fd;	755	int fd = w->fd;
454		756
455	ev_start ((struct ev_watcher *)w, 1);	757	ev_start ((W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	758	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	759	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		760
459	++fdchangecnt;	761	fd_change (fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	762	}
463		763
464	void	764	void
465	evio_stop (struct ev_io *w)	765	ev_io_stop (struct ev_io *w)
466	{	766	{
		767	ev_clear ((W)w);
467	if (!ev_is_active (w))	768	if (!ev_is_active (w))
468	return;	769	return;
469		770
470	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	771	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	772	ev_stop ((W)w);
472		773
473	++fdchangecnt;	774	fd_change (w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	775	}
477		776
478	void	777	void
479	evtimer_start (struct ev_timer *w)	778	ev_timer_start (struct ev_timer *w)
480	{	779	{
		780	if (ev_is_active (w))
		781	return;
		782
		783	w->at += now;
		784
		785	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
		786
		787	ev_start ((W)w, ++timercnt);
		788	array_needsize (timers, timermax, timercnt, );
		789	timers [timercnt - 1] = w;
		790	upheap ((WT *)timers, timercnt - 1);
		791	}
		792
		793	void
		794	ev_timer_stop (struct ev_timer *w)
		795	{
		796	ev_clear ((W)w);
481	if (ev_is_active (w))	797	if (!ev_is_active (w))
482	return;	798	return;
483		799
484	if (w->is_abs)	800	if (w->active < timercnt--)
		801	{
		802	timers [w->active - 1] = timers [timercnt];
		803	downheap ((WT *)timers, timercnt, w->active - 1);
485	{	804	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	805
		806	w->at = w->repeat;
		807
		808	ev_stop ((W)w);
		809	}
		810
		811	void
		812	ev_timer_again (struct ev_timer *w)
		813	{
		814	if (ev_is_active (w))
		815	{
487	if (w->repeat)	816	if (w->repeat)
		817	{
		818	w->at = now + w->repeat;
		819	downheap ((WT *)timers, timercnt, w->active - 1);
		820	}
		821	else
		822	ev_timer_stop (w);
		823	}
		824	else if (w->repeat)
		825	ev_timer_start (w);
		826	}
		827
		828	void
		829	ev_periodic_start (struct ev_periodic *w)
		830	{
		831	if (ev_is_active (w))
		832	return;
		833
		834	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
		835
		836	/* this formula differs from the one in periodic_reify because we do not always round up */
		837	if (w->interval)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	838	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
489		839
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	840	ev_start ((W)w, ++periodiccnt);
491	array_needsize (atimers, atimermax, atimercnt, );	841	array_needsize (periodics, periodicmax, periodiccnt, );
492	atimers [atimercnt - 1] = w;	842	periodics [periodiccnt - 1] = w;
493	upheap (atimers, atimercnt - 1);	843	upheap ((WT *)periodics, periodiccnt - 1);
		844	}
		845
		846	void
		847	ev_periodic_stop (struct ev_periodic *w)
		848	{
		849	ev_clear ((W)w);
		850	if (!ev_is_active (w))
		851	return;
		852
		853	if (w->active < periodiccnt--)
494	}	854	{
		855	periodics [w->active - 1] = periodics [periodiccnt];
		856	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		857	}
		858
		859	ev_stop ((W)w);
		860	}
		861
		862	void
		863	ev_signal_start (struct ev_signal *w)
		864	{
		865	if (ev_is_active (w))
		866	return;
		867
		868	ev_start ((W)w, 1);
		869	array_needsize (signals, signalmax, w->signum, signals_init);
		870	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		871
		872	if (!w->next)
		873	{
		874	struct sigaction sa;
		875	sa.sa_handler = sighandler;
		876	sigfillset (&sa.sa_mask);
		877	sa.sa_flags = 0;
		878	sigaction (w->signum, &sa, 0);
		879	}
		880	}
		881
		882	void
		883	ev_signal_stop (struct ev_signal *w)
		884	{
		885	ev_clear ((W)w);
		886	if (!ev_is_active (w))
		887	return;
		888
		889	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		890	ev_stop ((W)w);
		891
		892	if (!signals [w->signum - 1].head)
		893	signal (w->signum, SIG_DFL);
		894	}
		895
		896	void
		897	ev_idle_start (struct ev_idle *w)
		898	{
		899	if (ev_is_active (w))
		900	return;
		901
		902	ev_start ((W)w, ++idlecnt);
		903	array_needsize (idles, idlemax, idlecnt, );
		904	idles [idlecnt - 1] = w;
		905	}
		906
		907	void
		908	ev_idle_stop (struct ev_idle *w)
		909	{
		910	ev_clear ((W)w);
		911	if (ev_is_active (w))
		912	return;
		913
		914	idles [w->active - 1] = idles [--idlecnt];
		915	ev_stop ((W)w);
		916	}
		917
		918	void
		919	ev_prepare_start (struct ev_prepare *w)
		920	{
		921	if (ev_is_active (w))
		922	return;
		923
		924	ev_start ((W)w, ++preparecnt);
		925	array_needsize (prepares, preparemax, preparecnt, );
		926	prepares [preparecnt - 1] = w;
		927	}
		928
		929	void
		930	ev_prepare_stop (struct ev_prepare *w)
		931	{
		932	ev_clear ((W)w);
		933	if (ev_is_active (w))
		934	return;
		935
		936	prepares [w->active - 1] = prepares [--preparecnt];
		937	ev_stop ((W)w);
		938	}
		939
		940	void
		941	ev_check_start (struct ev_check *w)
		942	{
		943	if (ev_is_active (w))
		944	return;
		945
		946	ev_start ((W)w, ++checkcnt);
		947	array_needsize (checks, checkmax, checkcnt, );
		948	checks [checkcnt - 1] = w;
		949	}
		950
		951	void
		952	ev_check_stop (struct ev_check *w)
		953	{
		954	ev_clear ((W)w);
		955	if (ev_is_active (w))
		956	return;
		957
		958	checks [w->active - 1] = checks [--checkcnt];
		959	ev_stop ((W)w);
		960	}
		961
		962	void
		963	ev_child_start (struct ev_child *w)
		964	{
		965	if (ev_is_active (w))
		966	return;
		967
		968	ev_start ((W)w, 1);
		969	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		970	}
		971
		972	void
		973	ev_child_stop (struct ev_child *w)
		974	{
		975	ev_clear ((W)w);
		976	if (ev_is_active (w))
		977	return;
		978
		979	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		980	ev_stop ((W)w);
		981	}
		982
		983	/*****************************************************************************/
		984
		985	struct ev_once
		986	{
		987	struct ev_io io;
		988	struct ev_timer to;
		989	void (cb)(int revents, void arg);
		990	void *arg;
		991	};
		992
		993	static void
		994	once_cb (struct ev_once *once, int revents)
		995	{
		996	void (cb)(int revents, void arg) = once->cb;
		997	void *arg = once->arg;
		998
		999	ev_io_stop (&once->io);
		1000	ev_timer_stop (&once->to);
		1001	free (once);
		1002
		1003	cb (revents, arg);
		1004	}
		1005
		1006	static void
		1007	once_cb_io (struct ev_io *w, int revents)
		1008	{
		1009	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1010	}
		1011
		1012	static void
		1013	once_cb_to (struct ev_timer *w, int revents)
		1014	{
		1015	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1016	}
		1017
		1018	void
		1019	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1020	{
		1021	struct ev_once *once = malloc (sizeof (struct ev_once));
		1022
		1023	if (!once)
		1024	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
495	else	1025	else
496	{	1026	{
497	w->at += now;	1027	once->cb = cb;
		1028	once->arg = arg;
498		1029
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1030	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1031	if (fd >= 0)
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504
505	}
506
507	void
508	evtimer_stop (struct ev_timer *w)
509	{
510	if (!ev_is_active (w))
511	return;
512
513	if (w->is_abs)
514	{
515	if (w->active < atimercnt--)
516	{
517	atimers [w->active - 1] = atimers [atimercnt];
518	downheap (atimers, atimercnt, w->active - 1);
519	}	1032	{
520	}	1033	ev_io_set (&once->io, fd, events);
521	else	1034	ev_io_start (&once->io);
522	{
523	if (w->active < rtimercnt--)
524	{	1035	}
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1036
526	downheap (rtimers, rtimercnt, w->active - 1);	1037	ev_watcher_init (&once->to, once_cb_to);
		1038	if (timeout >= 0.)
527	}	1039	{
		1040	ev_timer_set (&once->to, timeout, 0.);
		1041	ev_timer_start (&once->to);
		1042	}
528	}	1043	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1044	}
532		1045
533	void
534	evsignal_start (struct ev_signal *w)
535	{
536	if (ev_is_active (w))
537	return;
538
539	ev_start ((struct ev_watcher *)w, 1);
540	array_needsize (signals, signalmax, w->signum, signals_init);
541	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
542	}
543
544	void
545	evsignal_stop (struct ev_signal *w)
546	{
547	if (!ev_is_active (w))
548	return;
549
550	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
551	ev_stop ((struct ev_watcher *)w);
552	}
553
554	/*****************************************************************************/	1046	/*****************************************************************************/
		1047
555	#if 1	1048	#if 0
		1049
		1050	struct ev_io wio;
556		1051
557	static void	1052	static void
558	sin_cb (struct ev_io *w, int revents)	1053	sin_cb (struct ev_io *w, int revents)
559	{	1054	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1055	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
562		1057
563	static void	1058	static void
564	ocb (struct ev_timer *w, int revents)	1059	ocb (struct ev_timer *w, int revents)
565	{	1060	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1061	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
567	evtimer_stop (w);	1062	ev_timer_stop (w);
568	evtimer_start (w);	1063	ev_timer_start (w);
		1064	}
		1065
		1066	static void
		1067	scb (struct ev_signal *w, int revents)
		1068	{
		1069	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1070	ev_io_stop (&wio);
		1071	ev_io_start (&wio);
		1072	}
		1073
		1074	static void
		1075	gcb (struct ev_signal *w, int revents)
		1076	{
		1077	fprintf (stderr, "generic %x\n", revents);
		1078
569	}	1079	}
570		1080
571	int main (void)	1081	int main (void)
572	{	1082	{
573	struct ev_io sin;
574
575	ev_init (0);	1083	ev_init (0);
576		1084
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);	1085	ev_io_init (&wio, sin_cb, 0, EV_READ);
579	evio_start (&sin);	1086	ev_io_start (&wio);
580		1087
581	struct ev_timer t[10000];	1088	struct ev_timer t[10000];
582		1089
583	#if 1	1090	#if 0
584	int i;	1091	int i;
585	for (i = 0; i < 10000; ++i)	1092	for (i = 0; i < 10000; ++i)
586	{	1093	{
587	struct ev_timer *w = t + i;	1094	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);	1095	ev_watcher_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);	1096	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
590	evtimer_start (w);	1097	ev_timer_start (w);
591	if (drand48 () < 0.5)	1098	if (drand48 () < 0.5)
592	evtimer_stop (w);	1099	ev_timer_stop (w);
593	}	1100	}
594	#endif	1101	#endif
595		1102
596	struct ev_timer t1;	1103	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);	1104	ev_timer_init (&t1, ocb, 5, 10);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);	1105	ev_timer_start (&t1);
		1106
		1107	struct ev_signal sig;
		1108	ev_signal_init (&sig, scb, SIGQUIT);
		1109	ev_signal_start (&sig);
		1110
		1111	struct ev_check cw;
		1112	ev_check_init (&cw, gcb);
		1113	ev_check_start (&cw);
		1114
		1115	struct ev_idle iw;
		1116	ev_idle_init (&iw, gcb);
		1117	ev_idle_start (&iw);
600		1118
601	ev_loop (0);	1119	ev_loop (0);
602		1120
603	return 0;	1121	return 0;
604	}	1122	}

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Comparing libev/ev.c (file contents): Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs. Revision 1.30 by root, Thu Nov 1 08:28:33 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.30 by root, Thu Nov 1 08:28:33 2007 UTC