[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 1.30 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
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_roundsize(base,n) ((n) \| 4 & ~3)
		119
74	#define array_needsize(base,cur,cnt,init) \	120	#define array_needsize(base,cur,cnt,init) \
75	if ((cnt) > cur) \	121	if ((cnt) > cur) \
76	{ \	122	{ \
77	int newcnt = cur ? cur << 1 : 16; \	123	int newcnt = cur; \
78	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	\
79	base = realloc (base, sizeof (base) (newcnt)); \	130	base = realloc (base, sizeof (base) (newcnt)); \
80	init (base + cur, newcnt - cur); \	131	init (base + cur, newcnt - cur); \
81	cur = newcnt; \	132	cur = newcnt; \
82	}	133	}
83		134
		135	/*****************************************************************************/
		136
84	typedef struct	137	typedef struct
85	{	138	{
86	struct ev_io *head;	139	struct ev_io *head;
87	unsigned char wev, rev; /* want, received event set */	140	int events;
88	} ANFD;	141	} ANFD;
89		142
90	static ANFD *anfds;	143	static ANFD *anfds;
91	static int anfdmax;	144	static int anfdmax;
92		145
93	static int *fdchanges;
94	static int fdchangemax, fdchangecnt;
95
96	static void	146	static void
97	anfds_init (ANFD *base, int count)	147	anfds_init (ANFD *base, int count)
98	{	148	{
99	while (count--)	149	while (count--)
100	{	150	{
101	base->head = 0;	151	base->head = 0;
102	base->wev = base->rev = EV_NONE;	152	base->events = EV_NONE;
103	++base;	153	++base;
104	}	154	}
105	}	155	}
106		156
107	typedef struct	157	typedef struct
108	{	158	{
109	struct ev_watcher *w;	159	W w;
110	int events;	160	int events;
111	} ANPENDING;	161	} ANPENDING;
112		162
113	static ANPENDING *pendings;	163	static ANPENDING *pendings;
114	static int pendingmax, pendingcnt;	164	static int pendingmax, pendingcnt;
115		165
116	static void	166	static void
117	event (struct ev_watcher *w, int events)	167	event (W w, int events)
118	{	168	{
119	w->pending = ++pendingcnt;	169	w->pending = ++pendingcnt;
120	array_needsize (pendings, pendingmax, pendingcnt, );	170	array_needsize (pendings, pendingmax, pendingcnt, );
121	pendings [pendingcnt - 1].w = w;	171	pendings [pendingcnt - 1].w = w;
122	pendings [pendingcnt - 1].events = events;	172	pendings [pendingcnt - 1].events = events;
123	}	173	}
124		174
125	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
126	fd_event (int fd, int events)	185	fd_event (int fd, int events)
127	{	186	{
128	ANFD *anfd = anfds + fd;	187	ANFD *anfd = anfds + fd;
129	struct ev_io *w;	188	struct ev_io *w;
130		189
131	for (w = anfd->head; w; w = w->next)	190	for (w = anfd->head; w; w = w->next)
132	{	191	{
133	int ev = w->events & events;	192	int ev = w->events & events;
134		193
135	if (ev)	194	if (ev)
136	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)
137	}	210	{
138	}	211	int fd = fdchanges [i];
		212	ANFD *anfd = anfds + fd;
		213	struct ev_io *w;
139		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
140	static struct ev_timer **atimers;	263	static struct ev_timer **timers;
141	static int atimermax, atimercnt;	264	static int timermax, timercnt;
142		265
143	static struct ev_timer **rtimers;	266	static struct ev_periodic **periodics;
144	static int rtimermax, rtimercnt;	267	static int periodicmax, periodiccnt;
145		268
146	static void	269	static void
147	upheap (struct ev_timer **timers, int k)	270	upheap (WT *timers, int k)
148	{	271	{
149	struct ev_timer *w = timers [k];	272	WT w = timers [k];
150		273
151	while (k && timers [k >> 1]->at > w->at)	274	while (k && timers [k >> 1]->at > w->at)
152	{	275	{
153	timers [k] = timers [k >> 1];	276	timers [k] = timers [k >> 1];
154	timers [k]->active = k + 1;	277	timers [k]->active = k + 1;
…		…
159	timers [k]->active = k + 1;	282	timers [k]->active = k + 1;
160		283
161	}	284	}
162		285
163	static void	286	static void
164	downheap (struct ev_timer **timers, int N, int k)	287	downheap (WT *timers, int N, int k)
165	{	288	{
166	struct ev_timer *w = timers [k];	289	WT w = timers [k];
167		290
168	while (k < (N >> 1))	291	while (k < (N >> 1))
169	{	292	{
170	int j = k << 1;	293	int j = k << 1;
171		294
…		…
181	}	304	}
182		305
183	timers [k] = w;	306	timers [k] = w;
184	timers [k]->active = k + 1;	307	timers [k]->active = k + 1;
185	}	308	}
		309
		310	/*****************************************************************************/
186		311
187	typedef struct	312	typedef struct
188	{	313	{
189	struct ev_signal *head;	314	struct ev_signal *head;
190	sig_atomic_t gotsig;	315	sig_atomic_t gotsig;
…		…
233	if (signals [sig].gotsig)	358	if (signals [sig].gotsig)
234	{	359	{
235	signals [sig].gotsig = 0;	360	signals [sig].gotsig = 0;
236		361
237	for (w = signals [sig].head; w; w = w->next)	362	for (w = signals [sig].head; w; w = w->next)
238	event ((struct ev_watcher *)w, EV_SIGNAL);	363	event ((W)w, EV_SIGNAL);
239	}	364	}
240	}	365	}
241		366
242	static void	367	static void
243	siginit (void)	368	siginit (void)
…		…
247		372
248	/* rather than sort out wether we really need nb, set it */	373	/* rather than sort out wether we really need nb, set it */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	374	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	375	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
251		376
252	evio_set (&sigev, sigpipe [0], EV_READ);	377	ev_io_set (&sigev, sigpipe [0], EV_READ);
253	evio_start (&sigev);	378	ev_io_start (&sigev);
254	}	379	}
255		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
256	#if HAVE_EPOLL	418	#if EV_USE_EPOLL
257	# include "ev_epoll.c"	419	# include "ev_epoll.c"
258	#endif	420	#endif
259	#if HAVE_SELECT	421	#if EV_USE_SELECT
260	# include "ev_select.c"	422	# include "ev_select.c"
261	#endif	423	#endif
262		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
263	int ev_init (int flags)	437	int ev_init (int flags)
264	{	438	{
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)	439	if (!ev_method)
		440	{
		441	#if EV_USE_MONOTONIC
289	{	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	{
290	evw_init (&sigev, sigcb, 0);	466	ev_watcher_init (&sigev, sigcb);
291	siginit ();	467	siginit ();
		468
		469	ev_signal_init (&childev, childcb, SIGCHLD);
		470	ev_signal_start (&childev);
		471	}
292	}	472	}
293		473
294	return ev_method;	474	return ev_method;
295	}	475	}
296		476
		477	/*****************************************************************************/
		478
		479	void
297	void ev_prefork (void)	480	ev_prefork (void)
298	{	481	{
		482	/* nop */
299	}	483	}
300		484
		485	void
301	void ev_postfork_parent (void)	486	ev_postfork_parent (void)
302	{	487	{
		488	/* nop */
303	}	489	}
304		490
		491	void
305	void ev_postfork_child (void)	492	ev_postfork_child (void)
306	{	493	{
307	#if HAVE_EPOLL	494	#if EV_USE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)	495	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();	496	epoll_postfork_child ();
310	#endif	497	#endif
311		498
312	evio_stop (&sigev);	499	ev_io_stop (&sigev);
313	close (sigpipe [0]);	500	close (sigpipe [0]);
314	close (sigpipe [1]);	501	close (sigpipe [1]);
315	pipe (sigpipe);	502	pipe (sigpipe);
316	siginit ();	503	siginit ();
317	}	504	}
318		505
319	static void	506	/*****************************************************************************/
320	fd_reify (void)
321	{
322	int i;
323		507
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	508	static void
346	call_pending ()	509	call_pending (void)
347	{	510	{
348	int i;	511	while (pendingcnt)
349
350	for (i = 0; i < pendingcnt; ++i)
351	{	512	{
352	ANPENDING *p = pendings + i;	513	ANPENDING *p = pendings + --pendingcnt;
353		514
354	if (p->w)	515	if (p->w)
355	{	516	{
356	p->w->pending = 0;	517	p->w->pending = 0;
357	p->w->cb (p->w, p->events);	518	p->w->cb (p->w, p->events);
358	}	519	}
359	}	520	}
360
361	pendingcnt = 0;
362	}	521	}
363		522
364	static void	523	static void
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	524	timers_reify (void)
366	{	525	{
367	while (timercnt && timers [0]->at <= now)	526	while (timercnt && timers [0]->at <= now)
368	{	527	{
369	struct ev_timer *w = timers [0];	528	struct ev_timer *w = timers [0];
370		529
371	/* first reschedule or stop timer */	530	/* first reschedule or stop timer */
372	if (w->repeat)	531	if (w->repeat)
373	{	532	{
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;	533	w->at = now + w->repeat;
378		534	assert (("timer timeout in the past, negative repeat?", w->at > now));
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	535	downheap ((WT *)timers, timercnt, 0);
382	}	536	}
383	else	537	else
384	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	538	ev_timer_stop (w); /* nonrepeating: stop timer */
386	--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)
387	}	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 */
388		560
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	561	event ((W)w, EV_TIMEOUT);
390	}	562	}
391	}	563	}
392		564
393	static void	565	static void
394	time_update ()	566	periodics_reschedule (ev_tstamp diff)
395	{	567	{
396	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
397	ev_now = ev_time ();	595	ev_now = ev_time ();
398		596
399	if (have_monotonic)	597	if (have_monotonic)
400	{	598	{
401	ev_tstamp odiff = diff;	599	ev_tstamp odiff = diff;
402		600
403	/* detecting time jumps is much more difficult */
404	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 */
405	{	602	{
406	now = get_clock ();	603	now = get_clock ();
407	diff = ev_now - now;	604	diff = ev_now - now;
408		605
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	606	if (fabs (odiff - diff) < MIN_TIMEJUMP)
410	return; /* all is well */	607	return; /* all is well */
411		608
412	ev_now = ev_time ();	609	ev_now = ev_time ();
413	}	610	}
414		611
415	/* time jump detected, reschedule atimers */	612	periodics_reschedule (diff - odiff);
416	for (i = 0; i < atimercnt; ++i)	613	/* 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	}	614	}
422	else	615	else
423	{	616	{
424	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	617	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425	/* 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 */
426	for (i = 0; i < rtimercnt; ++i)	622	for (i = 0; i < timercnt; ++i)
427	rtimers [i]->at += ev_now - now;	623	timers [i]->at += diff;
		624	}
428		625
429	now = ev_now;	626	now = ev_now;
430	}	627	}
431	}	628	}
432		629
433	int ev_loop_done;	630	int ev_loop_done;
434		631
435	void ev_loop (int flags)	632	void ev_loop (int flags)
436	{	633	{
437	double block;	634	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	635	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
439		636
440	do	637	do
441	{	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
442	/* update fd-related kernel structures */	646	/* update fd-related kernel structures */
443	fd_reify ();	647	fd_reify ();
444		648
445	/* 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
446	if (flags & EVLOOP_NONBLOCK)	655	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
447	block = 0.;	656	block = 0.;
448	else	657	else
449	{	658	{
450	block = MAX_BLOCKTIME;	659	block = MAX_BLOCKTIME;
451		660
452	if (rtimercnt)	661	if (timercnt)
453	{	662	{
454	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;
455	if (block > to) block = to;	664	if (block > to) block = to;
456	}	665	}
457		666
458	if (atimercnt)	667	if (periodiccnt)
459	{	668	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	669	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
461	if (block > to) block = to;	670	if (block > to) block = to;
462	}	671	}
463		672
464	if (block < 0.) block = 0.;	673	if (block < 0.) block = 0.;
465	}	674	}
…		…
467	method_poll (block);	676	method_poll (block);
468		677
469	/* update ev_now, do magic */	678	/* update ev_now, do magic */
470	time_update ();	679	time_update ();
471		680
472	/* put pending timers into pendign queue and reschedule them */	681	/* queue pending timers and reschedule them */
473	/* absolute timers first */	682	timers_reify (); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	683	periodics_reify (); /* absolute timers called first */
475	/* relative timers second */	684
476	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);
477		692
478	call_pending ();	693	call_pending ();
479	}	694	}
480	while (!ev_loop_done);	695	while (!ev_loop_done);
481	}
482		696
		697	if (ev_loop_done != 2)
		698	ev_loop_done = 0;
		699	}
		700
		701	/*****************************************************************************/
		702
483	static void	703	static void
484	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	704	wlist_add (WL *head, WL elem)
485	{	705	{
486	elem->next = *head;	706	elem->next = *head;
487	*head = elem;	707	*head = elem;
488	}	708	}
489		709
490	static void	710	static void
491	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	711	wlist_del (WL *head, WL elem)
492	{	712	{
493	while (*head)	713	while (*head)
494	{	714	{
495	if (*head == elem)	715	if (*head == elem)
496	{	716	{
…		…
501	head = &(*head)->next;	721	head = &(*head)->next;
502	}	722	}
503	}	723	}
504		724
505	static void	725	static void
506	ev_start (struct ev_watcher *w, int active)	726	ev_clear (W w)
507	{	727	{
		728	if (w->pending)
		729	{
		730	pendings [w->pending - 1].w = 0;
508	w->pending = 0;	731	w->pending = 0;
		732	}
		733	}
		734
		735	static void
		736	ev_start (W w, int active)
		737	{
509	w->active = active;	738	w->active = active;
510	}	739	}
511		740
512	static void	741	static void
513	ev_stop (struct ev_watcher *w)	742	ev_stop (W w)
514	{	743	{
515	if (w->pending)
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	744	w->active = 0;
519	/* nop */
520	}	745	}
521		746
		747	/*****************************************************************************/
		748
522	void	749	void
523	evio_start (struct ev_io *w)	750	ev_io_start (struct ev_io *w)
524	{	751	{
525	if (ev_is_active (w))	752	if (ev_is_active (w))
526	return;	753	return;
527		754
528	int fd = w->fd;	755	int fd = w->fd;
529		756
530	ev_start ((struct ev_watcher *)w, 1);	757	ev_start ((W)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	758	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	759	wlist_add ((WL *)&anfds[fd].head, (WL)w);
533		760
534	++fdchangecnt;	761	fd_change (fd);
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}	762	}
538		763
539	void	764	void
540	evio_stop (struct ev_io *w)	765	ev_io_stop (struct ev_io *w)
541	{	766	{
		767	ev_clear ((W)w);
542	if (!ev_is_active (w))	768	if (!ev_is_active (w))
543	return;	769	return;
544		770
545	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);
546	ev_stop ((struct ev_watcher *)w);	772	ev_stop ((W)w);
547		773
548	++fdchangecnt;	774	fd_change (w->fd);
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}	775	}
552		776
553	void	777	void
554	evtimer_start (struct ev_timer *w)	778	ev_timer_start (struct ev_timer *w)
555	{	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);
556	if (ev_is_active (w))	797	if (!ev_is_active (w))
557	return;	798	return;
558		799
559	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);
560	{	804	}
561	/* 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	{
562	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)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	838	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
564		839
565	ev_start ((struct ev_watcher *)w, ++atimercnt);	840	ev_start ((W)w, ++periodiccnt);
566	array_needsize (atimers, atimermax, atimercnt, );	841	array_needsize (periodics, periodicmax, periodiccnt, );
567	atimers [atimercnt - 1] = w;	842	periodics [periodiccnt - 1] = w;
568	upheap (atimers, atimercnt - 1);	843	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	}	844	}
581		845
582	void	846	void
583	evtimer_stop (struct ev_timer *w)	847	ev_periodic_stop (struct ev_periodic *w)
584	{	848	{
		849	ev_clear ((W)w);
585	if (!ev_is_active (w))	850	if (!ev_is_active (w))
586	return;	851	return;
587		852
588	if (w->is_abs)
589	{
590	if (w->active < atimercnt--)	853	if (w->active < periodiccnt--)
591	{
592	atimers [w->active - 1] = atimers [atimercnt];
593	downheap (atimers, atimercnt, w->active - 1);
594	}
595	}	854	{
596	else	855	periodics [w->active - 1] = periodics [periodiccnt];
		856	downheap ((WT *)periodics, periodiccnt, w->active - 1);
597	{	857	}
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		858
605	ev_stop ((struct ev_watcher *)w);	859	ev_stop ((W)w);
606	}	860	}
607		861
608	void	862	void
609	evsignal_start (struct ev_signal *w)	863	ev_signal_start (struct ev_signal *w)
610	{	864	{
611	if (ev_is_active (w))	865	if (ev_is_active (w))
612	return;	866	return;
613		867
614	ev_start ((struct ev_watcher *)w, 1);	868	ev_start ((W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	869	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);	870	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
617		871
618	if (!w->next)	872	if (!w->next)
619	{	873	{
620	struct sigaction sa;	874	struct sigaction sa;
621	sa.sa_handler = sighandler;	875	sa.sa_handler = sighandler;
…		…
624	sigaction (w->signum, &sa, 0);	878	sigaction (w->signum, &sa, 0);
625	}	879	}
626	}	880	}
627		881
628	void	882	void
629	evsignal_stop (struct ev_signal *w)	883	ev_signal_stop (struct ev_signal *w)
630	{	884	{
		885	ev_clear ((W)w);
631	if (!ev_is_active (w))	886	if (!ev_is_active (w))
632	return;	887	return;
633		888
634	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);
635	ev_stop ((struct ev_watcher *)w);	890	ev_stop ((W)w);
636		891
637	if (!signals [w->signum - 1].head)	892	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	893	signal (w->signum, SIG_DFL);
639	}	894	}
640		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
641	/*****************************************************************************/	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
642	#if 1	1048	#if 0
		1049
		1050	struct ev_io wio;
643		1051
644	static void	1052	static void
645	sin_cb (struct ev_io *w, int revents)	1053	sin_cb (struct ev_io *w, int revents)
646	{	1054	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1055	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
649		1057
650	static void	1058	static void
651	ocb (struct ev_timer *w, int revents)	1059	ocb (struct ev_timer *w, int revents)
652	{	1060	{
653	//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);
654	evtimer_stop (w);	1062	ev_timer_stop (w);
655	evtimer_start (w);	1063	ev_timer_start (w);
656	}	1064	}
657		1065
658	static void	1066	static void
659	scb (struct ev_signal *w, int revents)	1067	scb (struct ev_signal *w, int revents)
660	{	1068	{
661	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
662	}	1079	}
663		1080
664	int main (void)	1081	int main (void)
665	{	1082	{
666	struct ev_io sin;
667
668	ev_init (0);	1083	ev_init (0);
669		1084
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);	1085	ev_io_init (&wio, sin_cb, 0, EV_READ);
672	evio_start (&sin);	1086	ev_io_start (&wio);
673		1087
674	struct ev_timer t[10000];	1088	struct ev_timer t[10000];
675		1089
676	#if 0	1090	#if 0
677	int i;	1091	int i;
678	for (i = 0; i < 10000; ++i)	1092	for (i = 0; i < 10000; ++i)
679	{	1093	{
680	struct ev_timer *w = t + i;	1094	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);	1095	ev_watcher_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);	1096	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
683	evtimer_start (w);	1097	ev_timer_start (w);
684	if (drand48 () < 0.5)	1098	if (drand48 () < 0.5)
685	evtimer_stop (w);	1099	ev_timer_stop (w);
686	}	1100	}
687	#endif	1101	#endif
688		1102
689	struct ev_timer t1;	1103	struct ev_timer t1;
690	evw_init (&t1, ocb, 0);	1104	ev_timer_init (&t1, ocb, 5, 10);
691	evtimer_set_abs (&t1, 5, 10);
692	evtimer_start (&t1);	1105	ev_timer_start (&t1);
693		1106
694	struct ev_signal sig;	1107	struct ev_signal sig;
695	evw_init (&sig, scb, 65535);
696	evsignal_set (&sig, SIGQUIT);	1108	ev_signal_init (&sig, scb, SIGQUIT);
697	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);
698		1118
699	ev_loop (0);	1119	ev_loop (0);
700		1120
701	return 0;	1121	return 0;
702	}	1122	}

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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 1.30 by root, Thu Nov 1 08:28:33 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 1.30 by root, Thu Nov 1 08:28:33 2007 UTC