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

Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.29 by root, Thu Nov 1 08:10:03 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
40		82
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	83	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
42	static void (*method_modify)(int fd, int oev, int nev);	84	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);	85	static void (*method_poll)(ev_tstamp timeout);
44		86
		87	/*****************************************************************************/
		88
45	ev_tstamp	89	ev_tstamp
46	ev_time (void)	90	ev_time (void)
47	{	91	{
48	#if HAVE_REALTIME	92	#if EV_USE_REALTIME
49	struct timespec ts;	93	struct timespec ts;
50	clock_gettime (CLOCK_REALTIME, &ts);	94	clock_gettime (CLOCK_REALTIME, &ts);
51	return ts.tv_sec + ts.tv_nsec * 1e-9;	95	return ts.tv_sec + ts.tv_nsec * 1e-9;
52	#else	96	#else
53	struct timeval tv;	97	struct timeval tv;
…		…
57	}	101	}
58		102
59	static ev_tstamp	103	static ev_tstamp
60	get_clock (void)	104	get_clock (void)
61	{	105	{
62	#if HAVE_MONOTONIC	106	#if EV_USE_MONOTONIC
63	if (have_monotonic)	107	if (have_monotonic)
64	{	108	{
65	struct timespec ts;	109	struct timespec ts;
66	clock_gettime (CLOCK_MONOTONIC, &ts);	110	clock_gettime (CLOCK_MONOTONIC, &ts);
67	return ts.tv_sec + ts.tv_nsec * 1e-9;	111	return ts.tv_sec + ts.tv_nsec * 1e-9;
…		…
69	#endif	113	#endif
70		114
71	return ev_time ();	115	return ev_time ();
72	}	116	}
73		117
		118	#define array_nextsize(n) (((n) << 1) \| 4 & ~3)
		119	#define array_prevsize(n) (((n) >> 1) \| 4 & ~3)
		120
74	#define array_needsize(base,cur,cnt,init) \	121	#define array_needsize(base,cur,cnt,init) \
75	if ((cnt) > cur) \	122	if ((cnt) > cur) \
76	{ \	123	{ \
77	int newcnt = cur ? cur << 1 : 16; \	124	int newcnt = cur; \
78	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	125	do \
		126	{ \
		127	newcnt = array_nextsize (newcnt); \
		128	} \
		129	while ((cnt) > newcnt); \
		130	\
79	base = realloc (base, sizeof (base) (newcnt)); \	131	base = realloc (base, sizeof (base) (newcnt)); \
80	init (base + cur, newcnt - cur); \	132	init (base + cur, newcnt - cur); \
81	cur = newcnt; \	133	cur = newcnt; \
82	}	134	}
83		135
		136	/*****************************************************************************/
		137
84	typedef struct	138	typedef struct
85	{	139	{
86	struct ev_io *head;	140	struct ev_io *head;
87	unsigned char wev, rev; /* want, received event set */	141	int events;
88	} ANFD;	142	} ANFD;
89		143
90	static ANFD *anfds;	144	static ANFD *anfds;
91	static int anfdmax;	145	static int anfdmax;
92		146
		147	static void
		148	anfds_init (ANFD *base, int count)
		149	{
		150	while (count--)
		151	{
		152	base->head = 0;
		153	base->events = EV_NONE;
		154	++base;
		155	}
		156	}
		157
		158	typedef struct
		159	{
		160	W w;
		161	int events;
		162	} ANPENDING;
		163
		164	static ANPENDING *pendings;
		165	static int pendingmax, pendingcnt;
		166
		167	static void
		168	event (W w, int events)
		169	{
		170	if (w->active)
		171	{
		172	w->pending = ++pendingcnt;
		173	array_needsize (pendings, pendingmax, pendingcnt, );
		174	pendings [pendingcnt - 1].w = w;
		175	pendings [pendingcnt - 1].events = events;
		176	}
		177	}
		178
		179	static void
		180	queue_events (W *events, int eventcnt, int type)
		181	{
		182	int i;
		183
		184	for (i = 0; i < eventcnt; ++i)
		185	event (events [i], type);
		186	}
		187
		188	static void
		189	fd_event (int fd, int events)
		190	{
		191	ANFD *anfd = anfds + fd;
		192	struct ev_io *w;
		193
		194	for (w = anfd->head; w; w = w->next)
		195	{
		196	int ev = w->events & events;
		197
		198	if (ev)
		199	event ((W)w, ev);
		200	}
		201	}
		202
		203	/*****************************************************************************/
		204
93	static int *fdchanges;	205	static int *fdchanges;
94	static int fdchangemax, fdchangecnt;	206	static int fdchangemax, fdchangecnt;
95		207
96	static void	208	static void
97	anfds_init (ANFD *base, int count)	209	fd_reify (void)
98	{	210	{
99	while (count--)	211	int i;
100	{	212
101	base->head = 0;	213	for (i = 0; i < fdchangecnt; ++i)
102	base->wev = base->rev = EV_NONE;
103	++base;
104	}	214	{
105	}	215	int fd = fdchanges [i];
106
107	typedef struct
108	{
109	struct ev_watcher *w;
110	int events;
111	} ANPENDING;
112
113	static ANPENDING *pendings;
114	static int pendingmax, pendingcnt;
115
116	static void
117	event (struct ev_watcher *w, int events)
118	{
119	w->pending = ++pendingcnt;
120	array_needsize (pendings, pendingmax, pendingcnt, );
121	pendings [pendingcnt - 1].w = w;
122	pendings [pendingcnt - 1].events = events;
123	}
124
125	static void
126	fd_event (int fd, int events)
127	{
128	ANFD *anfd = anfds + fd;	216	ANFD *anfd = anfds + fd;
129	struct ev_io *w;	217	struct ev_io *w;
130		218
		219	int events = 0;
		220
131	for (w = anfd->head; w; w = w->next)	221	for (w = anfd->head; w; w = w->next)
		222	events \|= w->events;
		223
		224	anfd->events &= ~EV_REIFY;
		225
		226	if (anfd->events != events)
		227	{
		228	method_modify (fd, anfd->events, events);
		229	anfd->events = events;
		230	}
132	{	231	}
133	int ev = w->events & events;
134		232
135	if (ev)	233	fdchangecnt = 0;
136	event ((struct ev_watcher *)w, ev);
137	}
138	}	234	}
139		235
		236	static void
		237	fd_change (int fd)
		238	{
		239	if (anfds [fd].events & EV_REIFY \|\| fdchangecnt < 0)
		240	return;
		241
		242	anfds [fd].events \|= EV_REIFY;
		243
		244	++fdchangecnt;
		245	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		246	fdchanges [fdchangecnt - 1] = fd;
		247	}
		248
		249	/* called on EBADF to verify fds */
		250	static void
		251	fd_recheck (void)
		252	{
		253	int fd;
		254
		255	for (fd = 0; fd < anfdmax; ++fd)
		256	if (anfds [fd].events)
		257	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		258	while (anfds [fd].head)
		259	{
		260	event ((W)anfds [fd].head, EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT);
		261	ev_io_stop (anfds [fd].head);
		262	}
		263	}
		264
		265	/*****************************************************************************/
		266
140	static struct ev_timer **atimers;	267	static struct ev_timer **timers;
141	static int atimermax, atimercnt;	268	static int timermax, timercnt;
142		269
143	static struct ev_timer **rtimers;	270	static struct ev_periodic **periodics;
144	static int rtimermax, rtimercnt;	271	static int periodicmax, periodiccnt;
145		272
146	static void	273	static void
147	upheap (struct ev_timer **timers, int k)	274	upheap (WT *timers, int k)
148	{	275	{
149	struct ev_timer *w = timers [k];	276	WT w = timers [k];
150		277
151	while (k && timers [k >> 1]->at > w->at)	278	while (k && timers [k >> 1]->at > w->at)
152	{	279	{
153	timers [k] = timers [k >> 1];	280	timers [k] = timers [k >> 1];
154	timers [k]->active = k + 1;	281	timers [k]->active = k + 1;
…		…
159	timers [k]->active = k + 1;	286	timers [k]->active = k + 1;
160		287
161	}	288	}
162		289
163	static void	290	static void
164	downheap (struct ev_timer **timers, int N, int k)	291	downheap (WT *timers, int N, int k)
165	{	292	{
166	struct ev_timer *w = timers [k];	293	WT w = timers [k];
167		294
168	while (k < (N >> 1))	295	while (k < (N >> 1))
169	{	296	{
170	int j = k << 1;	297	int j = k << 1;
171		298
…		…
181	}	308	}
182		309
183	timers [k] = w;	310	timers [k] = w;
184	timers [k]->active = k + 1;	311	timers [k]->active = k + 1;
185	}	312	}
		313
		314	/*****************************************************************************/
186		315
187	typedef struct	316	typedef struct
188	{	317	{
189	struct ev_signal *head;	318	struct ev_signal *head;
190	sig_atomic_t gotsig;	319	sig_atomic_t gotsig;
…		…
233	if (signals [sig].gotsig)	362	if (signals [sig].gotsig)
234	{	363	{
235	signals [sig].gotsig = 0;	364	signals [sig].gotsig = 0;
236		365
237	for (w = signals [sig].head; w; w = w->next)	366	for (w = signals [sig].head; w; w = w->next)
238	event ((struct ev_watcher *)w, EV_SIGNAL);	367	event ((W)w, EV_SIGNAL);
239	}	368	}
240	}	369	}
241		370
242	static void	371	static void
243	siginit (void)	372	siginit (void)
…		…
247		376
248	/* rather than sort out wether we really need nb, set it */	377	/* rather than sort out wether we really need nb, set it */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	378	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	379	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
251		380
252	evio_set (&sigev, sigpipe [0], EV_READ);	381	ev_io_set (&sigev, sigpipe [0], EV_READ);
253	evio_start (&sigev);	382	ev_io_start (&sigev);
254	}	383	}
255		384
		385	/*****************************************************************************/
		386
		387	static struct ev_idle **idles;
		388	static int idlemax, idlecnt;
		389
		390	static struct ev_prepare **prepares;
		391	static int preparemax, preparecnt;
		392
		393	static struct ev_check **checks;
		394	static int checkmax, checkcnt;
		395
		396	/*****************************************************************************/
		397
		398	static struct ev_child *childs [PID_HASHSIZE];
		399	static struct ev_signal childev;
		400
		401	#ifndef WCONTINUED
		402	# define WCONTINUED 0
		403	#endif
		404
		405	static void
		406	childcb (struct ev_signal *sw, int revents)
		407	{
		408	struct ev_child *w;
		409	int pid, status;
		410
		411	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		412	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		413	if (w->pid == pid \|\| w->pid == -1)
		414	{
		415	w->status = status;
		416	event ((W)w, EV_CHILD);
		417	}
		418	}
		419
		420	/*****************************************************************************/
		421
256	#if HAVE_EPOLL	422	#if EV_USE_EPOLL
257	# include "ev_epoll.c"	423	# include "ev_epoll.c"
258	#endif	424	#endif
259	#if HAVE_SELECT	425	#if EV_USE_SELECT
260	# include "ev_select.c"	426	# include "ev_select.c"
261	#endif	427	#endif
262		428
		429	int
		430	ev_version_major (void)
		431	{
		432	return EV_VERSION_MAJOR;
		433	}
		434
		435	int
		436	ev_version_minor (void)
		437	{
		438	return EV_VERSION_MINOR;
		439	}
		440
263	int ev_init (int flags)	441	int ev_init (int flags)
264	{	442	{
265	#if HAVE_MONOTONIC
266	{
267	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;
270	}
271	#endif
272
273	ev_now = ev_time ();
274	now = get_clock ();
275	diff = ev_now - now;
276
277	if (pipe (sigpipe))
278	return 0;
279
280	ev_method = EVMETHOD_NONE;
281	#if HAVE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
283	#endif
284	#if HAVE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);
286	#endif
287
288	if (ev_method)	443	if (!ev_method)
		444	{
		445	#if EV_USE_MONOTONIC
289	{	446	{
		447	struct timespec ts;
		448	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		449	have_monotonic = 1;
		450	}
		451	#endif
		452
		453	ev_now = ev_time ();
		454	now = get_clock ();
		455	diff = ev_now - now;
		456
		457	if (pipe (sigpipe))
		458	return 0;
		459
		460	ev_method = EVMETHOD_NONE;
		461	#if EV_USE_EPOLL
		462	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
		463	#endif
		464	#if EV_USE_SELECT
		465	if (ev_method == EVMETHOD_NONE) select_init (flags);
		466	#endif
		467
		468	if (ev_method)
		469	{
290	evw_init (&sigev, sigcb, 0);	470	ev_watcher_init (&sigev, sigcb);
291	siginit ();	471	siginit ();
		472
		473	ev_signal_init (&childev, childcb, SIGCHLD);
		474	ev_signal_start (&childev);
		475	}
292	}	476	}
293		477
294	return ev_method;	478	return ev_method;
295	}	479	}
296		480
		481	/*****************************************************************************/
		482
		483	void
297	void ev_prefork (void)	484	ev_prefork (void)
298	{	485	{
		486	/* nop */
299	}	487	}
300		488
		489	void
301	void ev_postfork_parent (void)	490	ev_postfork_parent (void)
302	{	491	{
		492	/* nop */
303	}	493	}
304		494
		495	void
305	void ev_postfork_child (void)	496	ev_postfork_child (void)
306	{	497	{
307	#if HAVE_EPOLL	498	#if EV_USE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)	499	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();	500	epoll_postfork_child ();
310	#endif	501	#endif
311		502
312	evio_stop (&sigev);	503	ev_io_stop (&sigev);
313	close (sigpipe [0]);	504	close (sigpipe [0]);
314	close (sigpipe [1]);	505	close (sigpipe [1]);
315	pipe (sigpipe);	506	pipe (sigpipe);
316	siginit ();	507	siginit ();
317	}	508	}
318		509
319	static void	510	/*****************************************************************************/
320	fd_reify (void)
321	{
322	int i;
323		511
324	for (i = 0; i < fdchangecnt; ++i)
325	{
326	int fd = fdchanges [i];
327	ANFD *anfd = anfds + fd;
328	struct ev_io *w;
329
330	int wev = 0;
331
332	for (w = anfd->head; w; w = w->next)
333	wev \|= w->events;
334
335	if (anfd->wev != wev)
336	{
337	method_modify (fd, anfd->wev, wev);
338	anfd->wev = wev;
339	}
340	}
341
342	fdchangecnt = 0;
343	}
344
345	static void	512	static void
346	call_pending ()	513	call_pending (void)
347	{	514	{
348	int i;	515	while (pendingcnt)
349
350	for (i = 0; i < pendingcnt; ++i)
351	{	516	{
352	ANPENDING *p = pendings + i;	517	ANPENDING *p = pendings + --pendingcnt;
353		518
354	if (p->w)	519	if (p->w)
355	{	520	{
356	p->w->pending = 0;	521	p->w->pending = 0;
357	p->w->cb (p->w, p->events);	522	p->w->cb (p->w, p->events);
358	}	523	}
359	}	524	}
360
361	pendingcnt = 0;
362	}	525	}
363		526
364	static void	527	static void
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	528	timers_reify (void)
366	{	529	{
367	while (timercnt && timers [0]->at <= now)	530	while (timercnt && timers [0]->at <= now)
368	{	531	{
369	struct ev_timer *w = timers [0];	532	struct ev_timer *w = timers [0];
		533
		534	event ((W)w, EV_TIMEOUT);
370		535
371	/* first reschedule or stop timer */	536	/* first reschedule or stop timer */
372	if (w->repeat)	537	if (w->repeat)
373	{	538	{
374	if (w->is_abs)
375	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
376	else
377	w->at = now + w->repeat;	539	w->at = now + w->repeat;
378		540	assert (("timer timeout in the past, negative repeat?", w->at > now));
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	541	downheap ((WT *)timers, timercnt, 0);
382	}	542	}
383	else	543	else
384	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	544	ev_timer_stop (w); /* nonrepeating: stop timer */
386	--timercnt; /* maybe pass by reference instead? */	545	}
		546	}
		547
		548	static void
		549	periodics_reify (void)
		550	{
		551	while (periodiccnt && periodics [0]->at <= ev_now)
		552	{
		553	struct ev_periodic *w = periodics [0];
		554
		555	/* first reschedule or stop timer */
		556	if (w->interval)
387	}	557	{
		558	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		559	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
		560	downheap ((WT *)periodics, periodiccnt, 0);
		561	}
		562	else
		563	ev_periodic_stop (w); /* nonrepeating: stop timer */
388		564
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	565	event ((W)w, EV_TIMEOUT);
390	}	566	}
391	}	567	}
392		568
393	static void	569	static void
394	time_update ()	570	periodics_reschedule (ev_tstamp diff)
395	{	571	{
396	int i;	572	int i;
		573
		574	/* adjust periodics after time jump */
		575	for (i = 0; i < periodiccnt; ++i)
		576	{
		577	struct ev_periodic *w = periodics [i];
		578
		579	if (w->interval)
		580	{
		581	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		582
		583	if (fabs (diff) >= 1e-4)
		584	{
		585	ev_periodic_stop (w);
		586	ev_periodic_start (w);
		587
		588	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		589	}
		590	}
		591	}
		592	}
		593
		594	static void
		595	time_update (void)
		596	{
		597	int i;
		598
397	ev_now = ev_time ();	599	ev_now = ev_time ();
398		600
399	if (have_monotonic)	601	if (have_monotonic)
400	{	602	{
401	ev_tstamp odiff = diff;	603	ev_tstamp odiff = diff;
402		604
403	/* detecting time jumps is much more difficult */
404	for (i = 2; --i; ) /* loop a few times, before making important decisions */	605	for (i = 4; --i; ) /* loop a few times, before making important decisions */
405	{	606	{
406	now = get_clock ();	607	now = get_clock ();
407	diff = ev_now - now;	608	diff = ev_now - now;
408		609
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	610	if (fabs (odiff - diff) < MIN_TIMEJUMP)
410	return; /* all is well */	611	return; /* all is well */
411		612
412	ev_now = ev_time ();	613	ev_now = ev_time ();
413	}	614	}
414		615
415	/* time jump detected, reschedule atimers */	616	periodics_reschedule (diff - odiff);
416	for (i = 0; i < atimercnt; ++i)	617	/* no timer adjustment, as the monotonic clock doesn't jump */
417	{
418	struct ev_timer *w = atimers [i];
419	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
420	}
421	}	618	}
422	else	619	else
423	{	620	{
424	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	621	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425	/* time jump detected, adjust rtimers */	622	{
		623	periodics_reschedule (ev_now - now);
		624
		625	/* adjust timers. this is easy, as the offset is the same for all */
426	for (i = 0; i < rtimercnt; ++i)	626	for (i = 0; i < timercnt; ++i)
427	rtimers [i]->at += ev_now - now;	627	timers [i]->at += diff;
		628	}
428		629
429	now = ev_now;	630	now = ev_now;
430	}	631	}
431	}	632	}
432		633
433	int ev_loop_done;	634	int ev_loop_done;
434		635
435	void ev_loop (int flags)	636	void ev_loop (int flags)
436	{	637	{
437	double block;	638	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	639	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
439		640
440	do	641	do
441	{	642	{
		643	/* queue check watchers (and execute them) */
		644	if (preparecnt)
		645	{
		646	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		647	call_pending ();
		648	}
		649
442	/* update fd-related kernel structures */	650	/* update fd-related kernel structures */
443	fd_reify ();	651	fd_reify ();
444		652
445	/* calculate blocking time */	653	/* calculate blocking time */
		654
		655	/* we only need this for !monotonic clockor timers, but as we basically
		656	always have timers, we just calculate it always */
		657	ev_now = ev_time ();
		658
446	if (flags & EVLOOP_NONBLOCK)	659	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
447	block = 0.;	660	block = 0.;
448	else	661	else
449	{	662	{
450	block = MAX_BLOCKTIME;	663	block = MAX_BLOCKTIME;
451		664
452	if (rtimercnt)	665	if (timercnt)
453	{	666	{
454	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	667	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
455	if (block > to) block = to;	668	if (block > to) block = to;
456	}	669	}
457		670
458	if (atimercnt)	671	if (periodiccnt)
459	{	672	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	673	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
461	if (block > to) block = to;	674	if (block > to) block = to;
462	}	675	}
463		676
464	if (block < 0.) block = 0.;	677	if (block < 0.) block = 0.;
465	}	678	}
…		…
467	method_poll (block);	680	method_poll (block);
468		681
469	/* update ev_now, do magic */	682	/* update ev_now, do magic */
470	time_update ();	683	time_update ();
471		684
472	/* put pending timers into pendign queue and reschedule them */	685	/* queue pending timers and reschedule them */
473	/* absolute timers first */	686	timers_reify (); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	687	periodics_reify (); /* absolute timers called first */
475	/* relative timers second */	688
476	timers_reify (rtimers, rtimercnt, now);	689	/* queue idle watchers unless io or timers are pending */
		690	if (!pendingcnt)
		691	queue_events ((W *)idles, idlecnt, EV_IDLE);
		692
		693	/* queue check watchers, to be executed first */
		694	if (checkcnt)
		695	queue_events ((W *)checks, checkcnt, EV_CHECK);
477		696
478	call_pending ();	697	call_pending ();
479	}	698	}
480	while (!ev_loop_done);	699	while (!ev_loop_done);
481	}
482		700
		701	if (ev_loop_done != 2)
		702	ev_loop_done = 0;
		703	}
		704
		705	/*****************************************************************************/
		706
483	static void	707	static void
484	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	708	wlist_add (WL *head, WL elem)
485	{	709	{
486	elem->next = *head;	710	elem->next = *head;
487	*head = elem;	711	*head = elem;
488	}	712	}
489		713
490	static void	714	static void
491	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	715	wlist_del (WL *head, WL elem)
492	{	716	{
493	while (*head)	717	while (*head)
494	{	718	{
495	if (*head == elem)	719	if (*head == elem)
496	{	720	{
…		…
501	head = &(*head)->next;	725	head = &(*head)->next;
502	}	726	}
503	}	727	}
504		728
505	static void	729	static void
506	ev_start (struct ev_watcher *w, int active)	730	ev_clear (W w)
507	{	731	{
		732	if (w->pending)
		733	{
		734	pendings [w->pending - 1].w = 0;
508	w->pending = 0;	735	w->pending = 0;
		736	}
		737	}
		738
		739	static void
		740	ev_start (W w, int active)
		741	{
509	w->active = active;	742	w->active = active;
510	}	743	}
511		744
512	static void	745	static void
513	ev_stop (struct ev_watcher *w)	746	ev_stop (W w)
514	{	747	{
515	if (w->pending)
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	748	w->active = 0;
519	/* nop */
520	}	749	}
521		750
		751	/*****************************************************************************/
		752
522	void	753	void
523	evio_start (struct ev_io *w)	754	ev_io_start (struct ev_io *w)
524	{	755	{
525	if (ev_is_active (w))	756	if (ev_is_active (w))
526	return;	757	return;
527		758
528	int fd = w->fd;	759	int fd = w->fd;
529		760
530	ev_start ((struct ev_watcher *)w, 1);	761	ev_start ((W)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	762	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	763	wlist_add ((WL *)&anfds[fd].head, (WL)w);
533		764
534	++fdchangecnt;	765	fd_change (fd);
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}	766	}
538		767
539	void	768	void
540	evio_stop (struct ev_io *w)	769	ev_io_stop (struct ev_io *w)
541	{	770	{
		771	ev_clear ((W)w);
542	if (!ev_is_active (w))	772	if (!ev_is_active (w))
543	return;	773	return;
544		774
545	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	775	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
546	ev_stop ((struct ev_watcher *)w);	776	ev_stop ((W)w);
547		777
548	++fdchangecnt;	778	fd_change (w->fd);
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}	779	}
552		780
553	void	781	void
554	evtimer_start (struct ev_timer *w)	782	ev_timer_start (struct ev_timer *w)
555	{	783	{
		784	if (ev_is_active (w))
		785	return;
		786
		787	w->at += now;
		788
		789	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
		790
		791	ev_start ((W)w, ++timercnt);
		792	array_needsize (timers, timermax, timercnt, );
		793	timers [timercnt - 1] = w;
		794	upheap ((WT *)timers, timercnt - 1);
		795	}
		796
		797	void
		798	ev_timer_stop (struct ev_timer *w)
		799	{
		800	ev_clear ((W)w);
556	if (ev_is_active (w))	801	if (!ev_is_active (w))
557	return;	802	return;
558		803
559	if (w->is_abs)	804	if (w->active < timercnt--)
		805	{
		806	timers [w->active - 1] = timers [timercnt];
		807	downheap ((WT *)timers, timercnt, w->active - 1);
560	{	808	}
561	/* this formula differs from the one in timer_reify becuse we do not round up */	809
		810	w->at = w->repeat;
		811
		812	ev_stop ((W)w);
		813	}
		814
		815	void
		816	ev_timer_again (struct ev_timer *w)
		817	{
		818	if (ev_is_active (w))
		819	{
562	if (w->repeat)	820	if (w->repeat)
		821	{
		822	w->at = now + w->repeat;
		823	downheap ((WT *)timers, timercnt, w->active - 1);
		824	}
		825	else
		826	ev_timer_stop (w);
		827	}
		828	else if (w->repeat)
		829	ev_timer_start (w);
		830	}
		831
		832	void
		833	ev_periodic_start (struct ev_periodic *w)
		834	{
		835	if (ev_is_active (w))
		836	return;
		837
		838	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
		839
		840	/* this formula differs from the one in periodic_reify because we do not always round up */
		841	if (w->interval)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	842	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
564		843
565	ev_start ((struct ev_watcher *)w, ++atimercnt);	844	ev_start ((W)w, ++periodiccnt);
566	array_needsize (atimers, atimermax, atimercnt, );	845	array_needsize (periodics, periodicmax, periodiccnt, );
567	atimers [atimercnt - 1] = w;	846	periodics [periodiccnt - 1] = w;
568	upheap (atimers, atimercnt - 1);	847	upheap ((WT *)periodics, periodiccnt - 1);
569	}
570	else
571	{
572	w->at += now;
573
574	ev_start ((struct ev_watcher *)w, ++rtimercnt);
575	array_needsize (rtimers, rtimermax, rtimercnt, );
576	rtimers [rtimercnt - 1] = w;
577	upheap (rtimers, rtimercnt - 1);
578	}
579
580	}	848	}
581		849
582	void	850	void
583	evtimer_stop (struct ev_timer *w)	851	ev_periodic_stop (struct ev_periodic *w)
584	{	852	{
		853	ev_clear ((W)w);
585	if (!ev_is_active (w))	854	if (!ev_is_active (w))
586	return;	855	return;
587		856
588	if (w->is_abs)
589	{
590	if (w->active < atimercnt--)	857	if (w->active < periodiccnt--)
591	{
592	atimers [w->active - 1] = atimers [atimercnt];
593	downheap (atimers, atimercnt, w->active - 1);
594	}
595	}	858	{
596	else	859	periodics [w->active - 1] = periodics [periodiccnt];
		860	downheap ((WT *)periodics, periodiccnt, w->active - 1);
597	{	861	}
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		862
605	ev_stop ((struct ev_watcher *)w);	863	ev_stop ((W)w);
606	}	864	}
607		865
608	void	866	void
609	evsignal_start (struct ev_signal *w)	867	ev_signal_start (struct ev_signal *w)
610	{	868	{
611	if (ev_is_active (w))	869	if (ev_is_active (w))
612	return;	870	return;
613		871
614	ev_start ((struct ev_watcher *)w, 1);	872	ev_start ((W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	873	array_needsize (signals, signalmax, w->signum, signals_init);
616	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);	874	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
617		875
618	if (!w->next)	876	if (!w->next)
619	{	877	{
620	struct sigaction sa;	878	struct sigaction sa;
621	sa.sa_handler = sighandler;	879	sa.sa_handler = sighandler;
…		…
624	sigaction (w->signum, &sa, 0);	882	sigaction (w->signum, &sa, 0);
625	}	883	}
626	}	884	}
627		885
628	void	886	void
629	evsignal_stop (struct ev_signal *w)	887	ev_signal_stop (struct ev_signal *w)
630	{	888	{
		889	ev_clear ((W)w);
631	if (!ev_is_active (w))	890	if (!ev_is_active (w))
632	return;	891	return;
633		892
634	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);	893	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
635	ev_stop ((struct ev_watcher *)w);	894	ev_stop ((W)w);
636		895
637	if (!signals [w->signum - 1].head)	896	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	897	signal (w->signum, SIG_DFL);
639	}	898	}
640		899
		900	void
		901	ev_idle_start (struct ev_idle *w)
		902	{
		903	if (ev_is_active (w))
		904	return;
		905
		906	ev_start ((W)w, ++idlecnt);
		907	array_needsize (idles, idlemax, idlecnt, );
		908	idles [idlecnt - 1] = w;
		909	}
		910
		911	void
		912	ev_idle_stop (struct ev_idle *w)
		913	{
		914	ev_clear ((W)w);
		915	if (ev_is_active (w))
		916	return;
		917
		918	idles [w->active - 1] = idles [--idlecnt];
		919	ev_stop ((W)w);
		920	}
		921
		922	void
		923	ev_prepare_start (struct ev_prepare *w)
		924	{
		925	if (ev_is_active (w))
		926	return;
		927
		928	ev_start ((W)w, ++preparecnt);
		929	array_needsize (prepares, preparemax, preparecnt, );
		930	prepares [preparecnt - 1] = w;
		931	}
		932
		933	void
		934	ev_prepare_stop (struct ev_prepare *w)
		935	{
		936	ev_clear ((W)w);
		937	if (ev_is_active (w))
		938	return;
		939
		940	prepares [w->active - 1] = prepares [--preparecnt];
		941	ev_stop ((W)w);
		942	}
		943
		944	void
		945	ev_check_start (struct ev_check *w)
		946	{
		947	if (ev_is_active (w))
		948	return;
		949
		950	ev_start ((W)w, ++checkcnt);
		951	array_needsize (checks, checkmax, checkcnt, );
		952	checks [checkcnt - 1] = w;
		953	}
		954
		955	void
		956	ev_check_stop (struct ev_check *w)
		957	{
		958	ev_clear ((W)w);
		959	if (ev_is_active (w))
		960	return;
		961
		962	checks [w->active - 1] = checks [--checkcnt];
		963	ev_stop ((W)w);
		964	}
		965
		966	void
		967	ev_child_start (struct ev_child *w)
		968	{
		969	if (ev_is_active (w))
		970	return;
		971
		972	ev_start ((W)w, 1);
		973	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		974	}
		975
		976	void
		977	ev_child_stop (struct ev_child *w)
		978	{
		979	ev_clear ((W)w);
		980	if (ev_is_active (w))
		981	return;
		982
		983	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		984	ev_stop ((W)w);
		985	}
		986
641	/*****************************************************************************/	987	/*****************************************************************************/
		988
		989	struct ev_once
		990	{
		991	struct ev_io io;
		992	struct ev_timer to;
		993	void (cb)(int revents, void arg);
		994	void *arg;
		995	};
		996
		997	static void
		998	once_cb (struct ev_once *once, int revents)
		999	{
		1000	void (cb)(int revents, void arg) = once->cb;
		1001	void *arg = once->arg;
		1002
		1003	ev_io_stop (&once->io);
		1004	ev_timer_stop (&once->to);
		1005	free (once);
		1006
		1007	cb (revents, arg);
		1008	}
		1009
		1010	static void
		1011	once_cb_io (struct ev_io *w, int revents)
		1012	{
		1013	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1014	}
		1015
		1016	static void
		1017	once_cb_to (struct ev_timer *w, int revents)
		1018	{
		1019	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1020	}
		1021
		1022	void
		1023	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1024	{
		1025	struct ev_once *once = malloc (sizeof (struct ev_once));
		1026
		1027	if (!once)
		1028	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1029	else
		1030	{
		1031	once->cb = cb;
		1032	once->arg = arg;
		1033
		1034	ev_watcher_init (&once->io, once_cb_io);
		1035	if (fd >= 0)
		1036	{
		1037	ev_io_set (&once->io, fd, events);
		1038	ev_io_start (&once->io);
		1039	}
		1040
		1041	ev_watcher_init (&once->to, once_cb_to);
		1042	if (timeout >= 0.)
		1043	{
		1044	ev_timer_set (&once->to, timeout, 0.);
		1045	ev_timer_start (&once->to);
		1046	}
		1047	}
		1048	}
		1049
		1050	/*****************************************************************************/
		1051
642	#if 1	1052	#if 0
		1053
		1054	struct ev_io wio;
643		1055
644	static void	1056	static void
645	sin_cb (struct ev_io *w, int revents)	1057	sin_cb (struct ev_io *w, int revents)
646	{	1058	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1059	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
649		1061
650	static void	1062	static void
651	ocb (struct ev_timer *w, int revents)	1063	ocb (struct ev_timer *w, int revents)
652	{	1064	{
653	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1065	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
654	evtimer_stop (w);	1066	ev_timer_stop (w);
655	evtimer_start (w);	1067	ev_timer_start (w);
656	}	1068	}
657		1069
658	static void	1070	static void
659	scb (struct ev_signal *w, int revents)	1071	scb (struct ev_signal *w, int revents)
660	{	1072	{
661	fprintf (stderr, "signal %x,%d\n", revents, w->signum);	1073	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1074	ev_io_stop (&wio);
		1075	ev_io_start (&wio);
		1076	}
		1077
		1078	static void
		1079	gcb (struct ev_signal *w, int revents)
		1080	{
		1081	fprintf (stderr, "generic %x\n", revents);
		1082
662	}	1083	}
663		1084
664	int main (void)	1085	int main (void)
665	{	1086	{
666	struct ev_io sin;
667
668	ev_init (0);	1087	ev_init (0);
669		1088
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);	1089	ev_io_init (&wio, sin_cb, 0, EV_READ);
672	evio_start (&sin);	1090	ev_io_start (&wio);
673		1091
674	struct ev_timer t[10000];	1092	struct ev_timer t[10000];
675		1093
676	#if 0	1094	#if 0
677	int i;	1095	int i;
678	for (i = 0; i < 10000; ++i)	1096	for (i = 0; i < 10000; ++i)
679	{	1097	{
680	struct ev_timer *w = t + i;	1098	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);	1099	ev_watcher_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);	1100	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
683	evtimer_start (w);	1101	ev_timer_start (w);
684	if (drand48 () < 0.5)	1102	if (drand48 () < 0.5)
685	evtimer_stop (w);	1103	ev_timer_stop (w);
686	}	1104	}
687	#endif	1105	#endif
688		1106
689	struct ev_timer t1;	1107	struct ev_timer t1;
690	evw_init (&t1, ocb, 0);	1108	ev_timer_init (&t1, ocb, 5, 10);
691	evtimer_set_abs (&t1, 5, 10);
692	evtimer_start (&t1);	1109	ev_timer_start (&t1);
693		1110
694	struct ev_signal sig;	1111	struct ev_signal sig;
695	evw_init (&sig, scb, 65535);
696	evsignal_set (&sig, SIGQUIT);	1112	ev_signal_init (&sig, scb, SIGQUIT);
697	evsignal_start (&sig);	1113	ev_signal_start (&sig);
		1114
		1115	struct ev_check cw;
		1116	ev_check_init (&cw, gcb);
		1117	ev_check_start (&cw);
		1118
		1119	struct ev_idle iw;
		1120	ev_idle_init (&iw, gcb);
		1121	ev_idle_start (&iw);
698		1122
699	ev_loop (0);	1123	ev_loop (0);
700		1124
701	return 0;	1125	return 0;
702	}	1126	}

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Comparing libev/ev.c (file contents): Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs. Revision 1.29 by root, Thu Nov 1 08:10:03 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.29 by root, Thu Nov 1 08:10:03 2007 UTC