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

Comparing libev/ev.c (file contents):
Revision 1.8 by root, Wed Oct 31 00:32:33 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>
3	#include <unistd.h>	35	#include <unistd.h>
4	#include <fcntl.h>	36	#include <fcntl.h>
5	#include <signal.h>	37	#include <signal.h>
		38	#include <stddef.h>
6		39
7	#include <stdio.h>	40	#include <stdio.h>
8		41
9	#include <assert.h>	42	#include <assert.h>
10	#include <errno.h>	43	#include <errno.h>
		44	#include <sys/types.h>
		45	#include <sys/wait.h>
11	#include <sys/time.h>	46	#include <sys/time.h>
12	#include <time.h>	47	#include <time.h>
13		48
		49	#ifndef EV_USE_MONOTONIC
14	#ifdef CLOCK_MONOTONIC	50	# ifdef CLOCK_MONOTONIC
15	# define HAVE_MONOTONIC 1	51	# define EV_USE_MONOTONIC 1
16	#endif	52	# endif
		53	#endif
17		54
18	#define HAVE_REALTIME 1	55	#ifndef EV_USE_SELECT
19	#define HAVE_EPOLL 1
20	#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
21		66
22	#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) */
23	#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 */
24		70
25	#include "ev.h"	71	#include "ev.h"
26		72
27	struct ev_watcher {	73	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);
29	};
30
31	struct ev_watcher_list {	74	typedef struct ev_watcher_list *WL;
32	EV_WATCHER_LIST (ev_watcher_list);	75	typedef struct ev_watcher_time *WT;
33	};
34		76
35	static ev_tstamp now, diff; /* monotonic clock */	77	static ev_tstamp now, diff; /* monotonic clock */
36	ev_tstamp ev_now;	78	ev_tstamp ev_now;
37	int ev_method;	79	int ev_method;
38		80
45	/*****************************************************************************/	87	/*****************************************************************************/
46		88
47	ev_tstamp	89	ev_tstamp
48	ev_time (void)	90	ev_time (void)
49	{	91	{
50	#if HAVE_REALTIME	92	#if EV_USE_REALTIME
51	struct timespec ts;	93	struct timespec ts;
52	clock_gettime (CLOCK_REALTIME, &ts);	94	clock_gettime (CLOCK_REALTIME, &ts);
53	return ts.tv_sec + ts.tv_nsec * 1e-9;	95	return ts.tv_sec + ts.tv_nsec * 1e-9;
54	#else	96	#else
55	struct timeval tv;	97	struct timeval tv;
…		…
59	}	101	}
60		102
61	static ev_tstamp	103	static ev_tstamp
62	get_clock (void)	104	get_clock (void)
63	{	105	{
64	#if HAVE_MONOTONIC	106	#if EV_USE_MONOTONIC
65	if (have_monotonic)	107	if (have_monotonic)
66	{	108	{
67	struct timespec ts;	109	struct timespec ts;
68	clock_gettime (CLOCK_MONOTONIC, &ts);	110	clock_gettime (CLOCK_MONOTONIC, &ts);
69	return ts.tv_sec + ts.tv_nsec * 1e-9;	111	return ts.tv_sec + ts.tv_nsec * 1e-9;
…		…
71	#endif	113	#endif
72		114
73	return ev_time ();	115	return ev_time ();
74	}	116	}
75		117
		118	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		119
76	#define array_needsize(base,cur,cnt,init) \	120	#define array_needsize(base,cur,cnt,init) \
77	if ((cnt) > cur) \	121	if ((cnt) > cur) \
78	{ \	122	{ \
79	int newcnt = cur ? cur << 1 : 16; \	123	int newcnt = cur; \
80	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	\
81	base = realloc (base, sizeof (base) (newcnt)); \	130	base = realloc (base, sizeof (base) (newcnt)); \
82	init (base + cur, newcnt - cur); \	131	init (base + cur, newcnt - cur); \
83	cur = newcnt; \	132	cur = newcnt; \
84	}	133	}
85		134
86	/*****************************************************************************/	135	/*****************************************************************************/
87		136
88	typedef struct	137	typedef struct
89	{	138	{
90	struct ev_io *head;	139	struct ev_io *head;
91	unsigned char wev, rev; /* want, received event set */	140	int events;
92	} ANFD;	141	} ANFD;
93		142
94	static ANFD *anfds;	143	static ANFD *anfds;
95	static int anfdmax;	144	static int anfdmax;
96		145
97	static int *fdchanges;
98	static int fdchangemax, fdchangecnt;
99
100	static void	146	static void
101	anfds_init (ANFD *base, int count)	147	anfds_init (ANFD *base, int count)
102	{	148	{
103	while (count--)	149	while (count--)
104	{	150	{
105	base->head = 0;	151	base->head = 0;
106	base->wev = base->rev = EV_NONE;	152	base->events = EV_NONE;
107	++base;	153	++base;
108	}	154	}
109	}	155	}
110		156
111	typedef struct	157	typedef struct
112	{	158	{
113	struct ev_watcher *w;	159	W w;
114	int events;	160	int events;
115	} ANPENDING;	161	} ANPENDING;
116		162
117	static ANPENDING *pendings;	163	static ANPENDING *pendings;
118	static int pendingmax, pendingcnt;	164	static int pendingmax, pendingcnt;
119		165
120	static void	166	static void
121	event (struct ev_watcher *w, int events)	167	event (W w, int events)
122	{	168	{
123	w->pending = ++pendingcnt;	169	w->pending = ++pendingcnt;
124	array_needsize (pendings, pendingmax, pendingcnt, );	170	array_needsize (pendings, pendingmax, pendingcnt, );
125	pendings [pendingcnt - 1].w = w;	171	pendings [pendingcnt - 1].w = w;
126	pendings [pendingcnt - 1].events = events;	172	pendings [pendingcnt - 1].events = events;
127	}	173	}
128		174
129	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
130	fd_event (int fd, int events)	185	fd_event (int fd, int events)
131	{	186	{
132	ANFD *anfd = anfds + fd;	187	ANFD *anfd = anfds + fd;
133	struct ev_io *w;	188	struct ev_io *w;
134		189
135	for (w = anfd->head; w; w = w->next)	190	for (w = anfd->head; w; w = w->next)
136	{	191	{
137	int ev = w->events & events;	192	int ev = w->events & events;
138		193
139	if (ev)	194	if (ev)
140	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)
141	}	210	{
142	}	211	int fd = fdchanges [i];
		212	ANFD *anfd = anfds + fd;
		213	struct ev_io *w;
143		214
144	/*****************************************************************************/	215	int events = 0;
145		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
146	static struct ev_timer **atimers;	263	static struct ev_timer **timers;
147	static int atimermax, atimercnt;	264	static int timermax, timercnt;
148		265
149	static struct ev_timer **rtimers;	266	static struct ev_periodic **periodics;
150	static int rtimermax, rtimercnt;	267	static int periodicmax, periodiccnt;
151		268
152	static void	269	static void
153	upheap (struct ev_timer **timers, int k)	270	upheap (WT *timers, int k)
154	{	271	{
155	struct ev_timer *w = timers [k];	272	WT w = timers [k];
156		273
157	while (k && timers [k >> 1]->at > w->at)	274	while (k && timers [k >> 1]->at > w->at)
158	{	275	{
159	timers [k] = timers [k >> 1];	276	timers [k] = timers [k >> 1];
160	timers [k]->active = k + 1;	277	timers [k]->active = k + 1;
…		…
165	timers [k]->active = k + 1;	282	timers [k]->active = k + 1;
166		283
167	}	284	}
168		285
169	static void	286	static void
170	downheap (struct ev_timer **timers, int N, int k)	287	downheap (WT *timers, int N, int k)
171	{	288	{
172	struct ev_timer *w = timers [k];	289	WT w = timers [k];
173		290
174	while (k < (N >> 1))	291	while (k < (N >> 1))
175	{	292	{
176	int j = k << 1;	293	int j = k << 1;
177		294
…		…
241	if (signals [sig].gotsig)	358	if (signals [sig].gotsig)
242	{	359	{
243	signals [sig].gotsig = 0;	360	signals [sig].gotsig = 0;
244		361
245	for (w = signals [sig].head; w; w = w->next)	362	for (w = signals [sig].head; w; w = w->next)
246	event ((struct ev_watcher *)w, EV_SIGNAL);	363	event ((W)w, EV_SIGNAL);
247	}	364	}
248	}	365	}
249		366
250	static void	367	static void
251	siginit (void)	368	siginit (void)
…		…
255		372
256	/* rather than sort out wether we really need nb, set it */	373	/* rather than sort out wether we really need nb, set it */
257	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	374	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
258	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	375	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
259		376
260	evio_set (&sigev, sigpipe [0], EV_READ);	377	ev_io_set (&sigev, sigpipe [0], EV_READ);
261	evio_start (&sigev);	378	ev_io_start (&sigev);
262	}	379	}
263		380
264	/*****************************************************************************/	381	/*****************************************************************************/
265		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
266	#if HAVE_EPOLL	418	#if EV_USE_EPOLL
267	# include "ev_epoll.c"	419	# include "ev_epoll.c"
268	#endif	420	#endif
269	#if HAVE_SELECT	421	#if EV_USE_SELECT
270	# include "ev_select.c"	422	# include "ev_select.c"
271	#endif	423	#endif
272		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
273	int ev_init (int flags)	437	int ev_init (int flags)
274	{	438	{
275	#if HAVE_MONOTONIC
276	{
277	struct timespec ts;
278	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
279	have_monotonic = 1;
280	}
281	#endif
282
283	ev_now = ev_time ();
284	now = get_clock ();
285	diff = ev_now - now;
286
287	if (pipe (sigpipe))
288	return 0;
289
290	ev_method = EVMETHOD_NONE;
291	#if HAVE_EPOLL
292	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
293	#endif
294	#if HAVE_SELECT
295	if (ev_method == EVMETHOD_NONE) select_init (flags);
296	#endif
297
298	if (ev_method)	439	if (!ev_method)
		440	{
		441	#if EV_USE_MONOTONIC
299	{	442	{
		443	struct timespec ts;
		444	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		445	have_monotonic = 1;
		446	}
		447	#endif
		448
		449	ev_now = ev_time ();
		450	now = get_clock ();
		451	diff = ev_now - now;
		452
		453	if (pipe (sigpipe))
		454	return 0;
		455
		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	{
300	evw_init (&sigev, sigcb, 0);	466	ev_watcher_init (&sigev, sigcb);
301	siginit ();	467	siginit ();
		468
		469	ev_signal_init (&childev, childcb, SIGCHLD);
		470	ev_signal_start (&childev);
		471	}
302	}	472	}
303		473
304	return ev_method;	474	return ev_method;
305	}	475	}
306		476
307	/*****************************************************************************/	477	/*****************************************************************************/
308		478
		479	void
309	void ev_prefork (void)	480	ev_prefork (void)
310	{	481	{
		482	/* nop */
311	}	483	}
312		484
		485	void
313	void ev_postfork_parent (void)	486	ev_postfork_parent (void)
314	{	487	{
		488	/* nop */
315	}	489	}
316		490
		491	void
317	void ev_postfork_child (void)	492	ev_postfork_child (void)
318	{	493	{
319	#if HAVE_EPOLL	494	#if EV_USE_EPOLL
320	if (ev_method == EVMETHOD_EPOLL)	495	if (ev_method == EVMETHOD_EPOLL)
321	epoll_postfork_child ();	496	epoll_postfork_child ();
322	#endif	497	#endif
323		498
324	evio_stop (&sigev);	499	ev_io_stop (&sigev);
325	close (sigpipe [0]);	500	close (sigpipe [0]);
326	close (sigpipe [1]);	501	close (sigpipe [1]);
327	pipe (sigpipe);	502	pipe (sigpipe);
328	siginit ();	503	siginit ();
329	}	504	}
330		505
331	/*****************************************************************************/	506	/*****************************************************************************/
332		507
333	static ev_hook hooks [EVHOOK_NUM];
334
335	void
336	ev_hook_register (int type, ev_hook hook)
337	{
338	hooks [type] = hook;
339	}
340
341	void
342	ev_hook_unregister (int type, ev_hook hook)
343	{
344	hooks [type] = 0;
345	}
346
347	static void	508	static void
348	hook_call (int type)
349	{
350	if (hooks [type])
351	hooks [type] ();
352	}
353
354	static void
355	fd_reify (void)
356	{
357	int i;
358
359	for (i = 0; i < fdchangecnt; ++i)
360	{
361	int fd = fdchanges [i];
362	ANFD *anfd = anfds + fd;
363	struct ev_io *w;
364
365	int wev = 0;
366
367	for (w = anfd->head; w; w = w->next)
368	wev \|= w->events;
369
370	if (anfd->wev != wev)
371	{
372	method_modify (fd, anfd->wev, wev);
373	anfd->wev = wev;
374	}
375	}
376
377	fdchangecnt = 0;
378	}
379
380	static void
381	call_pending ()	509	call_pending (void)
382	{	510	{
383	int i;	511	while (pendingcnt)
384
385	for (i = 0; i < pendingcnt; ++i)
386	{	512	{
387	ANPENDING *p = pendings + i;	513	ANPENDING *p = pendings + --pendingcnt;
388		514
389	if (p->w)	515	if (p->w)
390	{	516	{
391	p->w->pending = 0;	517	p->w->pending = 0;
392	p->w->cb (p->w, p->events);	518	p->w->cb (p->w, p->events);
393	}	519	}
394	}	520	}
395
396	pendingcnt = 0;
397	}	521	}
398		522
399	static void	523	static void
400	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	524	timers_reify (void)
401	{	525	{
402	while (timercnt && timers [0]->at <= now)	526	while (timercnt && timers [0]->at <= now)
403	{	527	{
404	struct ev_timer *w = timers [0];	528	struct ev_timer *w = timers [0];
405		529
406	/* first reschedule or stop timer */	530	/* first reschedule or stop timer */
407	if (w->repeat)	531	if (w->repeat)
408	{	532	{
409	if (w->is_abs)
410	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
411	else
412	w->at = now + w->repeat;	533	w->at = now + w->repeat;
413		534	assert (("timer timeout in the past, negative repeat?", w->at > now));
414	assert (w->at > now);
415
416	downheap (timers, timercnt, 0);	535	downheap ((WT *)timers, timercnt, 0);
417	}	536	}
418	else	537	else
419	{
420	evtimer_stop (w); /* nonrepeating: stop timer */	538	ev_timer_stop (w); /* nonrepeating: stop timer */
421	--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)
422	}	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 */
423		560
424	event ((struct ev_watcher *)w, EV_TIMEOUT);	561	event ((W)w, EV_TIMEOUT);
425	}	562	}
426	}	563	}
427		564
428	static void	565	static void
429	time_update ()	566	periodics_reschedule (ev_tstamp diff)
430	{	567	{
431	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
432	ev_now = ev_time ();	595	ev_now = ev_time ();
433		596
434	if (have_monotonic)	597	if (have_monotonic)
435	{	598	{
436	ev_tstamp odiff = diff;	599	ev_tstamp odiff = diff;
437		600
438	/* detecting time jumps is much more difficult */
439	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 */
440	{	602	{
441	now = get_clock ();	603	now = get_clock ();
442	diff = ev_now - now;	604	diff = ev_now - now;
443		605
444	if (fabs (odiff - diff) < MIN_TIMEJUMP)	606	if (fabs (odiff - diff) < MIN_TIMEJUMP)
445	return; /* all is well */	607	return; /* all is well */
446		608
447	ev_now = ev_time ();	609	ev_now = ev_time ();
448	}	610	}
449		611
450	/* time jump detected, reschedule atimers */	612	periodics_reschedule (diff - odiff);
451	for (i = 0; i < atimercnt; ++i)	613	/* no timer adjustment, as the monotonic clock doesn't jump */
452	{
453	struct ev_timer *w = atimers [i];
454	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
455	}
456	}	614	}
457	else	615	else
458	{	616	{
459	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	617	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
460	/* 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 */
461	for (i = 0; i < rtimercnt; ++i)	622	for (i = 0; i < timercnt; ++i)
462	rtimers [i]->at += ev_now - now;	623	timers [i]->at += diff;
		624	}
463		625
464	now = ev_now;	626	now = ev_now;
465	}	627	}
466	}	628	}
467		629
468	int ev_loop_done;	630	int ev_loop_done;
469		631
470	void ev_loop (int flags)	632	void ev_loop (int flags)
471	{	633	{
472	double block;	634	double block;
473	ev_loop_done = flags & EVLOOP_ONESHOT;	635	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
474		636
475	do	637	do
476	{	638	{
477	hook_call (EVHOOK_PREPOLL);	639	/* queue check watchers (and execute them) */
		640	if (preparecnt)
		641	{
		642	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		643	call_pending ();
		644	}
478		645
479	/* update fd-related kernel structures */	646	/* update fd-related kernel structures */
480	fd_reify ();	647	fd_reify ();
481		648
482	/* 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
483	if (flags & EVLOOP_NONBLOCK)	655	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
484	block = 0.;	656	block = 0.;
485	else	657	else
486	{	658	{
487	block = MAX_BLOCKTIME;	659	block = MAX_BLOCKTIME;
488		660
489	if (rtimercnt)	661	if (timercnt)
490	{	662	{
491	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;
492	if (block > to) block = to;	664	if (block > to) block = to;
493	}	665	}
494		666
495	if (atimercnt)	667	if (periodiccnt)
496	{	668	{
497	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	669	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
498	if (block > to) block = to;	670	if (block > to) block = to;
499	}	671	}
500		672
501	if (block < 0.) block = 0.;	673	if (block < 0.) block = 0.;
502	}	674	}
…		…
504	method_poll (block);	676	method_poll (block);
505		677
506	/* update ev_now, do magic */	678	/* update ev_now, do magic */
507	time_update ();	679	time_update ();
508		680
509	hook_call (EVHOOK_POSTPOLL);
510
511	/* put pending timers into pendign queue and reschedule them */	681	/* queue pending timers and reschedule them */
512	/* absolute timers first */	682	timers_reify (); /* relative timers called last */
513	timers_reify (atimers, atimercnt, ev_now);	683	periodics_reify (); /* absolute timers called first */
514	/* relative timers second */	684
515	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);
516		692
517	call_pending ();	693	call_pending ();
518	}	694	}
519	while (!ev_loop_done);	695	while (!ev_loop_done);
520	}
521		696
522	/*****************************************************************************/	697	if (ev_loop_done != 2)
		698	ev_loop_done = 0;
		699	}
523		700
		701	/*****************************************************************************/
		702
524	static void	703	static void
525	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	704	wlist_add (WL *head, WL elem)
526	{	705	{
527	elem->next = *head;	706	elem->next = *head;
528	*head = elem;	707	*head = elem;
529	}	708	}
530		709
531	static void	710	static void
532	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	711	wlist_del (WL *head, WL elem)
533	{	712	{
534	while (*head)	713	while (*head)
535	{	714	{
536	if (*head == elem)	715	if (*head == elem)
537	{	716	{
…		…
542	head = &(*head)->next;	721	head = &(*head)->next;
543	}	722	}
544	}	723	}
545		724
546	static void	725	static void
547	ev_start (struct ev_watcher *w, int active)	726	ev_clear (W w)
548	{	727	{
		728	if (w->pending)
		729	{
		730	pendings [w->pending - 1].w = 0;
549	w->pending = 0;	731	w->pending = 0;
		732	}
		733	}
		734
		735	static void
		736	ev_start (W w, int active)
		737	{
550	w->active = active;	738	w->active = active;
551	}	739	}
552		740
553	static void	741	static void
554	ev_stop (struct ev_watcher *w)	742	ev_stop (W w)
555	{	743	{
556	if (w->pending)
557	pendings [w->pending - 1].w = 0;
558
559	w->active = 0;	744	w->active = 0;
560	/* nop */
561	}	745	}
562		746
563	/*****************************************************************************/	747	/*****************************************************************************/
564		748
565	void	749	void
566	evio_start (struct ev_io *w)	750	ev_io_start (struct ev_io *w)
567	{	751	{
568	if (ev_is_active (w))	752	if (ev_is_active (w))
569	return;	753	return;
570		754
571	int fd = w->fd;	755	int fd = w->fd;
572		756
573	ev_start ((struct ev_watcher *)w, 1);	757	ev_start ((W)w, 1);
574	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	758	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
575	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	759	wlist_add ((WL *)&anfds[fd].head, (WL)w);
576		760
577	++fdchangecnt;	761	fd_change (fd);
578	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
579	fdchanges [fdchangecnt - 1] = fd;
580	}	762	}
581		763
582	void	764	void
583	evio_stop (struct ev_io *w)	765	ev_io_stop (struct ev_io *w)
584	{	766	{
		767	ev_clear ((W)w);
585	if (!ev_is_active (w))	768	if (!ev_is_active (w))
586	return;	769	return;
587		770
588	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);
589	ev_stop ((struct ev_watcher *)w);	772	ev_stop ((W)w);
590		773
591	++fdchangecnt;	774	fd_change (w->fd);
592	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
593	fdchanges [fdchangecnt - 1] = w->fd;
594	}	775	}
595		776
596	void	777	void
597	evtimer_start (struct ev_timer *w)	778	ev_timer_start (struct ev_timer *w)
598	{	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);
599	if (ev_is_active (w))	797	if (!ev_is_active (w))
600	return;	798	return;
601		799
602	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);
603	{	804	}
604	/* 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	{
605	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)
606	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	838	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
607		839
608	ev_start ((struct ev_watcher *)w, ++atimercnt);	840	ev_start ((W)w, ++periodiccnt);
609	array_needsize (atimers, atimermax, atimercnt, );	841	array_needsize (periodics, periodicmax, periodiccnt, );
610	atimers [atimercnt - 1] = w;	842	periodics [periodiccnt - 1] = w;
611	upheap (atimers, atimercnt - 1);	843	upheap ((WT *)periodics, periodiccnt - 1);
612	}
613	else
614	{
615	w->at += now;
616
617	ev_start ((struct ev_watcher *)w, ++rtimercnt);
618	array_needsize (rtimers, rtimermax, rtimercnt, );
619	rtimers [rtimercnt - 1] = w;
620	upheap (rtimers, rtimercnt - 1);
621	}
622
623	}	844	}
624		845
625	void	846	void
626	evtimer_stop (struct ev_timer *w)	847	ev_periodic_stop (struct ev_periodic *w)
627	{	848	{
		849	ev_clear ((W)w);
628	if (!ev_is_active (w))	850	if (!ev_is_active (w))
629	return;	851	return;
630		852
631	if (w->is_abs)
632	{
633	if (w->active < atimercnt--)	853	if (w->active < periodiccnt--)
634	{
635	atimers [w->active - 1] = atimers [atimercnt];
636	downheap (atimers, atimercnt, w->active - 1);
637	}
638	}	854	{
639	else	855	periodics [w->active - 1] = periodics [periodiccnt];
		856	downheap ((WT *)periodics, periodiccnt, w->active - 1);
640	{	857	}
641	if (w->active < rtimercnt--)
642	{
643	rtimers [w->active - 1] = rtimers [rtimercnt];
644	downheap (rtimers, rtimercnt, w->active - 1);
645	}
646	}
647		858
648	ev_stop ((struct ev_watcher *)w);	859	ev_stop ((W)w);
649	}	860	}
650		861
651	void	862	void
652	evsignal_start (struct ev_signal *w)	863	ev_signal_start (struct ev_signal *w)
653	{	864	{
654	if (ev_is_active (w))	865	if (ev_is_active (w))
655	return;	866	return;
656		867
657	ev_start ((struct ev_watcher *)w, 1);	868	ev_start ((W)w, 1);
658	array_needsize (signals, signalmax, w->signum, signals_init);	869	array_needsize (signals, signalmax, w->signum, signals_init);
659	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);	870	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
660		871
661	if (!w->next)	872	if (!w->next)
662	{	873	{
663	struct sigaction sa;	874	struct sigaction sa;
664	sa.sa_handler = sighandler;	875	sa.sa_handler = sighandler;
…		…
667	sigaction (w->signum, &sa, 0);	878	sigaction (w->signum, &sa, 0);
668	}	879	}
669	}	880	}
670		881
671	void	882	void
672	evsignal_stop (struct ev_signal *w)	883	ev_signal_stop (struct ev_signal *w)
673	{	884	{
		885	ev_clear ((W)w);
674	if (!ev_is_active (w))	886	if (!ev_is_active (w))
675	return;	887	return;
676		888
677	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);	889	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
678	ev_stop ((struct ev_watcher *)w);	890	ev_stop ((W)w);
679		891
680	if (!signals [w->signum - 1].head)	892	if (!signals [w->signum - 1].head)
681	signal (w->signum, SIG_DFL);	893	signal (w->signum, SIG_DFL);
682	}	894	}
683		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
684	/*****************************************************************************/	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);
		1025	else
		1026	{
		1027	once->cb = cb;
		1028	once->arg = arg;
		1029
		1030	ev_watcher_init (&once->io, once_cb_io);
		1031	if (fd >= 0)
		1032	{
		1033	ev_io_set (&once->io, fd, events);
		1034	ev_io_start (&once->io);
		1035	}
		1036
		1037	ev_watcher_init (&once->to, once_cb_to);
		1038	if (timeout >= 0.)
		1039	{
		1040	ev_timer_set (&once->to, timeout, 0.);
		1041	ev_timer_start (&once->to);
		1042	}
		1043	}
		1044	}
		1045
		1046	/*****************************************************************************/
		1047
685	#if 1	1048	#if 0
		1049
		1050	struct ev_io wio;
686		1051
687	static void	1052	static void
688	sin_cb (struct ev_io *w, int revents)	1053	sin_cb (struct ev_io *w, int revents)
689	{	1054	{
690	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1055	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
692		1057
693	static void	1058	static void
694	ocb (struct ev_timer *w, int revents)	1059	ocb (struct ev_timer *w, int revents)
695	{	1060	{
696	//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);
697	evtimer_stop (w);	1062	ev_timer_stop (w);
698	evtimer_start (w);	1063	ev_timer_start (w);
699	}	1064	}
700		1065
701	static void	1066	static void
702	scb (struct ev_signal *w, int revents)	1067	scb (struct ev_signal *w, int revents)
703	{	1068	{
704	fprintf (stderr, "signal %x,%d\n", revents, w->signum);	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
705	}	1079	}
706		1080
707	int main (void)	1081	int main (void)
708	{	1082	{
709	struct ev_io sin;
710
711	ev_init (0);	1083	ev_init (0);
712		1084
713	evw_init (&sin, sin_cb, 55);
714	evio_set (&sin, 0, EV_READ);	1085	ev_io_init (&wio, sin_cb, 0, EV_READ);
715	evio_start (&sin);	1086	ev_io_start (&wio);
716		1087
717	struct ev_timer t[10000];	1088	struct ev_timer t[10000];
718		1089
719	#if 1	1090	#if 0
720	int i;	1091	int i;
721	for (i = 0; i < 10000; ++i)	1092	for (i = 0; i < 10000; ++i)
722	{	1093	{
723	struct ev_timer *w = t + i;	1094	struct ev_timer *w = t + i;
724	evw_init (w, ocb, i);	1095	ev_watcher_init (w, ocb, i);
725	evtimer_set_abs (w, drand48 (), 0.99775533);	1096	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
726	evtimer_start (w);	1097	ev_timer_start (w);
727	if (drand48 () < 0.5)	1098	if (drand48 () < 0.5)
728	evtimer_stop (w);	1099	ev_timer_stop (w);
729	}	1100	}
730	#endif	1101	#endif
731		1102
732	struct ev_timer t1;	1103	struct ev_timer t1;
733	evw_init (&t1, ocb, 0);	1104	ev_timer_init (&t1, ocb, 5, 10);
734	evtimer_set_abs (&t1, 5, 10);
735	evtimer_start (&t1);	1105	ev_timer_start (&t1);
736		1106
737	struct ev_signal sig;	1107	struct ev_signal sig;
738	evw_init (&sig, scb, 65535);
739	evsignal_set (&sig, SIGQUIT);	1108	ev_signal_init (&sig, scb, SIGQUIT);
740	evsignal_start (&sig);	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);
741		1118
742	ev_loop (0);	1119	ev_loop (0);
743		1120
744	return 0;	1121	return 0;
745	}	1122	}

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Comparing libev/ev.c (file contents): Revision 1.8 by root, Wed Oct 31 00:32:33 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 1.8 by root, Wed Oct 31 00:32:33 2007 UTC vs.
Revision 1.30 by root, Thu Nov 1 08:28:33 2007 UTC