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

Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.31 by root, Thu Nov 1 09:05:33 2007 UTC

…		…
		1	/*
		2	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions are
		7	* met:
		8	*
		9	* * Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	*
		12	* * Redistributions in binary form must reproduce the above
		13	* copyright notice, this list of conditions and the following
		14	* disclaimer in the documentation and/or other materials provided
		15	* with the distribution.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		18	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		19	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		20	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		21	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		22	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		23	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		27	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		28	*/
		29	#if EV_USE_CONFIG_H
		30	# include "config.h"
		31	#endif
		32
1	#include <math.h>	33	#include <math.h>
2	#include <stdlib.h>	34	#include <stdlib.h>
		35	#include <unistd.h>
		36	#include <fcntl.h>
		37	#include <signal.h>
		38	#include <stddef.h>
3		39
4	#include <stdio.h>	40	#include <stdio.h>
5		41
6	#include <assert.h>	42	#include <assert.h>
7	#include <errno.h>	43	#include <errno.h>
		44	#include <sys/types.h>
		45	#include <sys/wait.h>
8	#include <sys/time.h>	46	#include <sys/time.h>
9	#include <time.h>	47	#include <time.h>
10		48
		49	#ifndef EV_USE_MONOTONIC
11	#ifdef CLOCK_MONOTONIC	50	# ifdef CLOCK_MONOTONIC
12	# define HAVE_MONOTONIC 1	51	# define EV_USE_MONOTONIC 1
13	#endif	52	# endif
		53	#endif
14		54
15	#define HAVE_EPOLL 1	55	#ifndef EV_USE_SELECT
16	#define HAVE_REALTIME 1
17	#define HAVE_SELECT 1	56	# define EV_USE_SELECT 1
		57	#endif
		58
		59	#ifndef EV_USE_EPOLL
		60	# define EV_USE_EPOLL 0
		61	#endif
		62
		63	#ifndef CLOCK_REALTIME
		64	# define EV_USE_REALTIME 0
		65	#endif
		66	#ifndef EV_USE_REALTIME
		67	# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */
		68	#endif
18		69
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	70	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	71	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detetc time jumps) */
		72	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		73	#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
21		74
22	#include "ev.h"	75	#include "ev.h"
23		76
24	struct ev_watcher {	77	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	78	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	79	typedef struct ev_watcher_time *WT;
30	};
31		80
32	static ev_tstamp now, diff; /* monotonic clock */	81	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	82	ev_tstamp ev_now;
34	int ev_method;	83	int ev_method;
35		84
37		86
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	87	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
39	static void (*method_modify)(int fd, int oev, int nev);	88	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);	89	static void (*method_poll)(ev_tstamp timeout);
41		90
		91	/*****************************************************************************/
		92
42	ev_tstamp	93	ev_tstamp
43	ev_time (void)	94	ev_time (void)
44	{	95	{
45	#if HAVE_REALTIME	96	#if EV_USE_REALTIME
46	struct timespec ts;	97	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	98	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	99	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	100	#else
50	struct timeval tv;	101	struct timeval tv;
…		…
54	}	105	}
55		106
56	static ev_tstamp	107	static ev_tstamp
57	get_clock (void)	108	get_clock (void)
58	{	109	{
59	#if HAVE_MONOTONIC	110	#if EV_USE_MONOTONIC
60	if (have_monotonic)	111	if (have_monotonic)
61	{	112	{
62	struct timespec ts;	113	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	114	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	115	return ts.tv_sec + ts.tv_nsec * 1e-9;
…		…
66	#endif	117	#endif
67		118
68	return ev_time ();	119	return ev_time ();
69	}	120	}
70		121
		122	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		123
71	#define array_needsize(base,cur,cnt,init) \	124	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	125	if ((cnt) > cur) \
73	{ \	126	{ \
74	int newcnt = cur ? cur << 1 : 16; \	127	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	128	do \
		129	{ \
		130	newcnt = array_roundsize (base, newcnt << 1); \
		131	} \
		132	while ((cnt) > newcnt); \
		133	\
76	base = realloc (base, sizeof (base) (newcnt)); \	134	base = realloc (base, sizeof (base) (newcnt)); \
77	init (base + cur, newcnt - cur); \	135	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	136	cur = newcnt; \
79	}	137	}
80		138
		139	/*****************************************************************************/
		140
81	typedef struct	141	typedef struct
82	{	142	{
83	struct ev_io *head;	143	struct ev_io *head;
84	unsigned char wev, rev; /* want, received event set */	144	int events;
85	} ANFD;	145	} ANFD;
86		146
87	static ANFD *anfds;	147	static ANFD *anfds;
88	static int anfdmax;	148	static int anfdmax;
89		149
90	static int *fdchanges;
91	static int fdchangemax, fdchangecnt;
92
93	static void	150	static void
94	anfds_init (ANFD *base, int count)	151	anfds_init (ANFD *base, int count)
95	{	152	{
96	while (count--)	153	while (count--)
97	{	154	{
98	base->head = 0;	155	base->head = 0;
99	base->wev = base->rev = EV_NONE;	156	base->events = EV_NONE;
100	++base;	157	++base;
101	}	158	}
102	}	159	}
103		160
104	typedef struct	161	typedef struct
105	{	162	{
106	struct ev_watcher *w;	163	W w;
107	int events;	164	int events;
108	} ANPENDING;	165	} ANPENDING;
109		166
110	static ANPENDING *pendings;	167	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;	168	static int pendingmax, pendingcnt;
112		169
113	static void	170	static void
114	event (struct ev_watcher *w, int events)	171	event (W w, int events)
115	{	172	{
116	w->pending = ++pendingcnt;	173	w->pending = ++pendingcnt;
117	array_needsize (pendings, pendingmax, pendingcnt, );	174	array_needsize (pendings, pendingmax, pendingcnt, );
118	pendings [pendingcnt - 1].w = w;	175	pendings [pendingcnt - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	176	pendings [pendingcnt - 1].events = events;
120	}	177	}
121		178
122	static void	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
123	fd_event (int fd, int events)	189	fd_event (int fd, int events)
124	{	190	{
125	ANFD *anfd = anfds + fd;	191	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	192	struct ev_io *w;
127		193
128	for (w = anfd->head; w; w = w->next)	194	for (w = anfd->head; w; w = w->next)
129	{	195	{
130	int ev = w->events & events;	196	int ev = w->events & events;
131		197
132	if (ev)	198	if (ev)
133	event ((struct ev_watcher *)w, ev);	199	event ((W)w, ev);
		200	}
		201	}
		202
		203	/*****************************************************************************/
		204
		205	static int *fdchanges;
		206	static int fdchangemax, fdchangecnt;
		207
		208	static void
		209	fd_reify (void)
		210	{
		211	int i;
		212
		213	for (i = 0; i < fdchangecnt; ++i)
134	}	214	{
135	}	215	int fd = fdchanges [i];
		216	ANFD *anfd = anfds + fd;
		217	struct ev_io *w;
136		218
		219	int events = 0;
		220
		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	}
		231	}
		232
		233	fdchangecnt = 0;
		234	}
		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
137	static struct ev_timer **atimers;	267	static struct ev_timer **timers;
138	static int atimermax, atimercnt;	268	static int timermax, timercnt;
139		269
140	static struct ev_timer **rtimers;	270	static struct ev_periodic **periodics;
141	static int rtimermax, rtimercnt;	271	static int periodicmax, periodiccnt;
142		272
143	static void	273	static void
144	upheap (struct ev_timer **timers, int k)	274	upheap (WT *timers, int k)
145	{	275	{
146	struct ev_timer *w = timers [k];	276	WT w = timers [k];
147		277
148	while (k && timers [k >> 1]->at > w->at)	278	while (k && timers [k >> 1]->at > w->at)
149	{	279	{
150	timers [k] = timers [k >> 1];	280	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;	281	timers [k]->active = k + 1;
…		…
156	timers [k]->active = k + 1;	286	timers [k]->active = k + 1;
157		287
158	}	288	}
159		289
160	static void	290	static void
161	downheap (struct ev_timer **timers, int N, int k)	291	downheap (WT *timers, int N, int k)
162	{	292	{
163	struct ev_timer *w = timers [k];	293	WT w = timers [k];
164		294
165	while (k < (N >> 1))	295	while (k < (N >> 1))
166	{	296	{
167	int j = k << 1;	297	int j = k << 1;
168		298
…		…
179		309
180	timers [k] = w;	310	timers [k] = w;
181	timers [k]->active = k + 1;	311	timers [k]->active = k + 1;
182	}	312	}
183		313
184	static struct ev_signal **signals;	314	/*****************************************************************************/
		315
		316	typedef struct
		317	{
		318	struct ev_signal *head;
		319	sig_atomic_t gotsig;
		320	} ANSIG;
		321
		322	static ANSIG *signals;
185	static int signalmax;	323	static int signalmax;
186		324
		325	static int sigpipe [2];
		326	static sig_atomic_t gotsig;
		327	static struct ev_io sigev;
		328
187	static void	329	static void
188	signals_init (struct ev_signal **base, int count)	330	signals_init (ANSIG *base, int count)
189	{	331	{
190	while (count--)	332	while (count--)
191	*base++ = 0;	333	{
		334	base->head = 0;
		335	base->gotsig = 0;
		336	++base;
		337	}
192	}	338	}
193		339
		340	static void
		341	sighandler (int signum)
		342	{
		343	signals [signum - 1].gotsig = 1;
		344
		345	if (!gotsig)
		346	{
		347	gotsig = 1;
		348	write (sigpipe [1], &gotsig, 1);
		349	}
		350	}
		351
		352	static void
		353	sigcb (struct ev_io *iow, int revents)
		354	{
		355	struct ev_signal *w;
		356	int sig;
		357
		358	gotsig = 0;
		359	read (sigpipe [0], &revents, 1);
		360
		361	for (sig = signalmax; sig--; )
		362	if (signals [sig].gotsig)
		363	{
		364	signals [sig].gotsig = 0;
		365
		366	for (w = signals [sig].head; w; w = w->next)
		367	event ((W)w, EV_SIGNAL);
		368	}
		369	}
		370
		371	static void
		372	siginit (void)
		373	{
		374	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		375	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		376
		377	/* rather than sort out wether we really need nb, set it */
		378	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		379	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		380
		381	ev_io_set (&sigev, sigpipe [0], EV_READ);
		382	ev_io_start (&sigev);
		383	}
		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
194	#if HAVE_EPOLL	422	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	423	# include "ev_epoll.c"
196	#endif	424	#endif
197	#if HAVE_SELECT	425	#if EV_USE_SELECT
198	# include "ev_select.c"	426	# include "ev_select.c"
199	#endif	427	#endif
200		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
201	int ev_init (int flags)	441	int ev_init (int flags)
202	{	442	{
		443	if (!ev_method)
		444	{
203	#if HAVE_MONOTONIC	445	#if EV_USE_MONOTONIC
204	{	446	{
205	struct timespec ts;	447	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	448	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	449	have_monotonic = 1;
208	}	450	}
209	#endif	451	#endif
210		452
211	ev_now = ev_time ();	453	ev_now = ev_time ();
212	now = get_clock ();	454	now = get_clock ();
213	diff = ev_now - now;	455	diff = ev_now - now;
214		456
215	#if HAVE_EPOLL	457	if (pipe (sigpipe))
216	if (epoll_init (flags))	458	return 0;
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223		459
224	ev_method = EVMETHOD_NONE;	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	{
		470	ev_watcher_init (&sigev, sigcb);
		471	siginit ();
		472
		473	ev_signal_init (&childev, childcb, SIGCHLD);
		474	ev_signal_start (&childev);
		475	}
		476	}
		477
225	return ev_method;	478	return ev_method;
226	}	479	}
227		480
		481	/*****************************************************************************/
		482
		483	void
228	void ev_prefork (void)	484	ev_prefork (void)
229	{	485	{
		486	/* nop */
230	}	487	}
231		488
		489	void
232	void ev_postfork_parent (void)	490	ev_postfork_parent (void)
233	{	491	{
		492	/* nop */
234	}	493	}
235		494
		495	void
236	void ev_postfork_child (void)	496	ev_postfork_child (void)
237	{	497	{
238	#if HAVE_EPOLL	498	#if EV_USE_EPOLL
239	if (ev_method == EVMETHOD_EPOLL)	499	if (ev_method == EVMETHOD_EPOLL)
240	epoll_postfork_child ();	500	epoll_postfork_child ();
241	#endif	501	#endif
242	}
243		502
244	static void	503	ev_io_stop (&sigev);
245	fd_reify (void)	504	close (sigpipe [0]);
246	{	505	close (sigpipe [1]);
247	int i;	506	pipe (sigpipe);
248		507	siginit ();
249	for (i = 0; i < fdchangecnt; ++i)
250	{
251	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;
253	struct ev_io *w;
254
255	int wev = 0;
256
257	for (w = anfd->head; w; w = w->next)
258	wev \|= w->events;
259
260	if (anfd->wev != wev)
261	{
262	method_modify (fd, anfd->wev, wev);
263	anfd->wev = wev;
264	}
265	}
266
267	fdchangecnt = 0;
268	}	508	}
269		509
		510	/*****************************************************************************/
		511
270	static void	512	static void
271	call_pending ()	513	call_pending (void)
272	{	514	{
273	int i;	515	while (pendingcnt)
274
275	for (i = 0; i < pendingcnt; ++i)
276	{	516	{
277	ANPENDING *p = pendings + i;	517	ANPENDING *p = pendings + --pendingcnt;
278		518
279	if (p->w)	519	if (p->w)
280	{	520	{
281	p->w->pending = 0;	521	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	522	p->w->cb (p->w, p->events);
283	}	523	}
284	}	524	}
285
286	pendingcnt = 0;
287	}	525	}
288		526
289	static void	527	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	528	timers_reify (void)
291	{	529	{
292	while (timercnt && timers [0]->at <= now)	530	while (timercnt && timers [0]->at <= now)
293	{	531	{
294	struct ev_timer *w = timers [0];	532	struct ev_timer *w = timers [0];
295		533
296	/* first reschedule or stop timer */	534	/* first reschedule or stop timer */
297	if (w->repeat)	535	if (w->repeat)
298	{	536	{
299	if (w->is_abs)
300	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
301	else
302	w->at = now + w->repeat;	537	w->at = now + w->repeat;
303		538	assert (("timer timeout in the past, negative repeat?", w->at > now));
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	539	downheap ((WT *)timers, timercnt, 0);
307	}	540	}
308	else	541	else
309	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	542	ev_timer_stop (w); /* nonrepeating: stop timer */
311	--timercnt; /* maybe pass by reference instead? */	543
		544	event ((W)w, EV_TIMEOUT);
		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)
312	}	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 */
313		564
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	565	event ((W)w, EV_TIMEOUT);
315	}	566	}
316	}	567	}
317		568
318	static void	569	static void
319	time_update ()	570	periodics_reschedule (ev_tstamp diff)
320	{	571	{
321	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
322	ev_now = ev_time ();	599	ev_now = ev_time ();
323		600
324	if (have_monotonic)	601	if (have_monotonic)
325	{	602	{
326	ev_tstamp odiff = diff;	603	ev_tstamp odiff = diff;
327		604
328	/* detecting time jumps is much more difficult */
329	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 */
330	{	606	{
331	now = get_clock ();	607	now = get_clock ();
332	diff = ev_now - now;	608	diff = ev_now - now;
333		609
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	610	if (fabs (odiff - diff) < MIN_TIMEJUMP)
335	return; /* all is well */	611	return; /* all is well */
336		612
337	ev_now = ev_time ();	613	ev_now = ev_time ();
338	}	614	}
339		615
340	/* time jump detected, reschedule atimers */	616	periodics_reschedule (diff - odiff);
341	for (i = 0; i < atimercnt; ++i)	617	/* no timer adjustment, as the monotonic clock doesn't jump */
342	{
343	struct ev_timer *w = atimers [i];
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
345	}
346	}	618	}
347	else	619	else
348	{	620	{
349	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	621	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
350	/* 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 */
351	for (i = 0; i < rtimercnt; ++i)	626	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	627	timers [i]->at += diff;
		628	}
353		629
354	now = ev_now;	630	now = ev_now;
355	}	631	}
356	}	632	}
357		633
358	int ev_loop_done;	634	int ev_loop_done;
359		635
360	void ev_loop (int flags)	636	void ev_loop (int flags)
361	{	637	{
362	double block;	638	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	639	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
364		640
365	do	641	do
366	{	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
367	/* update fd-related kernel structures */	650	/* update fd-related kernel structures */
368	fd_reify ();	651	fd_reify ();
369		652
370	/* 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
371	if (flags & EVLOOP_NONBLOCK)	659	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
372	block = 0.;	660	block = 0.;
373	else	661	else
374	{	662	{
375	block = MAX_BLOCKTIME;	663	block = MAX_BLOCKTIME;
376		664
377	if (rtimercnt)	665	if (timercnt)
378	{	666	{
379	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;
380	if (block > to) block = to;	668	if (block > to) block = to;
381	}	669	}
382		670
383	if (atimercnt)	671	if (periodiccnt)
384	{	672	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	673	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
386	if (block > to) block = to;	674	if (block > to) block = to;
387	}	675	}
388		676
389	if (block < 0.) block = 0.;	677	if (block < 0.) block = 0.;
390	}	678	}
…		…
392	method_poll (block);	680	method_poll (block);
393		681
394	/* update ev_now, do magic */	682	/* update ev_now, do magic */
395	time_update ();	683	time_update ();
396		684
397	/* put pending timers into pendign queue and reschedule them */	685	/* queue pending timers and reschedule them */
398	/* absolute timers first */	686	timers_reify (); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	687	periodics_reify (); /* absolute timers called first */
400	/* relative timers second */	688
401	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);
402		696
403	call_pending ();	697	call_pending ();
404	}	698	}
405	while (!ev_loop_done);	699	while (!ev_loop_done);
406	}
407		700
		701	if (ev_loop_done != 2)
		702	ev_loop_done = 0;
		703	}
		704
		705	/*****************************************************************************/
		706
408	static void	707	static void
409	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	708	wlist_add (WL *head, WL elem)
410	{	709	{
411	elem->next = *head;	710	elem->next = *head;
412	*head = elem;	711	*head = elem;
413	}	712	}
414		713
415	static void	714	static void
416	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	715	wlist_del (WL *head, WL elem)
417	{	716	{
418	while (*head)	717	while (*head)
419	{	718	{
420	if (*head == elem)	719	if (*head == elem)
421	{	720	{
…		…
426	head = &(*head)->next;	725	head = &(*head)->next;
427	}	726	}
428	}	727	}
429		728
430	static void	729	static void
431	ev_start (struct ev_watcher *w, int active)	730	ev_clear (W w)
432	{	731	{
		732	if (w->pending)
		733	{
		734	pendings [w->pending - 1].w = 0;
433	w->pending = 0;	735	w->pending = 0;
		736	}
		737	}
		738
		739	static void
		740	ev_start (W w, int active)
		741	{
434	w->active = active;	742	w->active = active;
435	}	743	}
436		744
437	static void	745	static void
438	ev_stop (struct ev_watcher *w)	746	ev_stop (W w)
439	{	747	{
440	if (w->pending)
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	748	w->active = 0;
444	/* nop */
445	}	749	}
446		750
		751	/*****************************************************************************/
		752
447	void	753	void
448	evio_start (struct ev_io *w)	754	ev_io_start (struct ev_io *w)
449	{	755	{
450	if (ev_is_active (w))	756	if (ev_is_active (w))
451	return;	757	return;
452		758
453	int fd = w->fd;	759	int fd = w->fd;
454		760
455	ev_start ((struct ev_watcher *)w, 1);	761	ev_start ((W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	762	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	763	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		764
459	++fdchangecnt;	765	fd_change (fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	766	}
463		767
464	void	768	void
465	evio_stop (struct ev_io *w)	769	ev_io_stop (struct ev_io *w)
466	{	770	{
		771	ev_clear ((W)w);
467	if (!ev_is_active (w))	772	if (!ev_is_active (w))
468	return;	773	return;
469		774
470	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);
471	ev_stop ((struct ev_watcher *)w);	776	ev_stop ((W)w);
472		777
473	++fdchangecnt;	778	fd_change (w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	779	}
477		780
478	void	781	void
479	evtimer_start (struct ev_timer *w)	782	ev_timer_start (struct ev_timer *w)
480	{	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);
481	if (ev_is_active (w))	801	if (!ev_is_active (w))
482	return;	802	return;
483		803
484	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);
485	{	808	}
486	/* 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	{
487	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)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	842	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
489		843
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	844	ev_start ((W)w, ++periodiccnt);
491	array_needsize (atimers, atimermax, atimercnt, );	845	array_needsize (periodics, periodicmax, periodiccnt, );
492	atimers [atimercnt - 1] = w;	846	periodics [periodiccnt - 1] = w;
493	upheap (atimers, atimercnt - 1);	847	upheap ((WT *)periodics, periodiccnt - 1);
		848	}
		849
		850	void
		851	ev_periodic_stop (struct ev_periodic *w)
		852	{
		853	ev_clear ((W)w);
		854	if (!ev_is_active (w))
		855	return;
		856
		857	if (w->active < periodiccnt--)
494	}	858	{
		859	periodics [w->active - 1] = periodics [periodiccnt];
		860	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		861	}
		862
		863	ev_stop ((W)w);
		864	}
		865
		866	void
		867	ev_signal_start (struct ev_signal *w)
		868	{
		869	if (ev_is_active (w))
		870	return;
		871
		872	ev_start ((W)w, 1);
		873	array_needsize (signals, signalmax, w->signum, signals_init);
		874	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		875
		876	if (!w->next)
		877	{
		878	struct sigaction sa;
		879	sa.sa_handler = sighandler;
		880	sigfillset (&sa.sa_mask);
		881	sa.sa_flags = 0;
		882	sigaction (w->signum, &sa, 0);
		883	}
		884	}
		885
		886	void
		887	ev_signal_stop (struct ev_signal *w)
		888	{
		889	ev_clear ((W)w);
		890	if (!ev_is_active (w))
		891	return;
		892
		893	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		894	ev_stop ((W)w);
		895
		896	if (!signals [w->signum - 1].head)
		897	signal (w->signum, SIG_DFL);
		898	}
		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
		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);
495	else	1029	else
496	{	1030	{
497	w->at += now;	1031	once->cb = cb;
		1032	once->arg = arg;
498		1033
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1034	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1035	if (fd >= 0)
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504
505	}
506
507	void
508	evtimer_stop (struct ev_timer *w)
509	{
510	if (!ev_is_active (w))
511	return;
512
513	if (w->is_abs)
514	{
515	if (w->active < atimercnt--)
516	{
517	atimers [w->active - 1] = atimers [atimercnt];
518	downheap (atimers, atimercnt, w->active - 1);
519	}	1036	{
520	}	1037	ev_io_set (&once->io, fd, events);
521	else	1038	ev_io_start (&once->io);
522	{
523	if (w->active < rtimercnt--)
524	{	1039	}
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1040
526	downheap (rtimers, rtimercnt, w->active - 1);	1041	ev_watcher_init (&once->to, once_cb_to);
		1042	if (timeout >= 0.)
527	}	1043	{
		1044	ev_timer_set (&once->to, timeout, 0.);
		1045	ev_timer_start (&once->to);
		1046	}
528	}	1047	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1048	}
532		1049
533	void
534	evsignal_start (struct ev_signal *w)
535	{
536	if (ev_is_active (w))
537	return;
538
539	ev_start ((struct ev_watcher *)w, 1);
540	array_needsize (signals, signalmax, w->signum, signals_init);
541	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
542	}
543
544	void
545	evsignal_stop (struct ev_signal *w)
546	{
547	if (!ev_is_active (w))
548	return;
549
550	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
551	ev_stop ((struct ev_watcher *)w);
552	}
553
554	/*****************************************************************************/	1050	/*****************************************************************************/
		1051
555	#if 1	1052	#if 0
		1053
		1054	struct ev_io wio;
556		1055
557	static void	1056	static void
558	sin_cb (struct ev_io *w, int revents)	1057	sin_cb (struct ev_io *w, int revents)
559	{	1058	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1059	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
562		1061
563	static void	1062	static void
564	ocb (struct ev_timer *w, int revents)	1063	ocb (struct ev_timer *w, int revents)
565	{	1064	{
566	//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);
567	evtimer_stop (w);	1066	ev_timer_stop (w);
568	evtimer_start (w);	1067	ev_timer_start (w);
		1068	}
		1069
		1070	static void
		1071	scb (struct ev_signal *w, int revents)
		1072	{
		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
569	}	1083	}
570		1084
571	int main (void)	1085	int main (void)
572	{	1086	{
573	struct ev_io sin;
574
575	ev_init (0);	1087	ev_init (0);
576		1088
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);	1089	ev_io_init (&wio, sin_cb, 0, EV_READ);
579	evio_start (&sin);	1090	ev_io_start (&wio);
580		1091
581	struct ev_timer t[10000];	1092	struct ev_timer t[10000];
582		1093
583	#if 1	1094	#if 0
584	int i;	1095	int i;
585	for (i = 0; i < 10000; ++i)	1096	for (i = 0; i < 10000; ++i)
586	{	1097	{
587	struct ev_timer *w = t + i;	1098	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);	1099	ev_watcher_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);	1100	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
590	evtimer_start (w);	1101	ev_timer_start (w);
591	if (drand48 () < 0.5)	1102	if (drand48 () < 0.5)
592	evtimer_stop (w);	1103	ev_timer_stop (w);
593	}	1104	}
594	#endif	1105	#endif
595		1106
596	struct ev_timer t1;	1107	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);	1108	ev_timer_init (&t1, ocb, 5, 10);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);	1109	ev_timer_start (&t1);
		1110
		1111	struct ev_signal sig;
		1112	ev_signal_init (&sig, scb, SIGQUIT);
		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);
600		1122
601	ev_loop (0);	1123	ev_loop (0);
602		1124
603	return 0;	1125	return 0;
604	}	1126	}

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Comparing libev/ev.c (file contents): Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs. Revision 1.31 by root, Thu Nov 1 09:05:33 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.31 by root, Thu Nov 1 09:05:33 2007 UTC