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

Comparing libev/ev.c (file contents):
Revision 1.1 by root, Tue Oct 30 20:59:31 2007 UTC vs.
Revision 1.42 by root, Fri Nov 2 20:05:05 2007 UTC

…		…
		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#if EV_USE_CONFIG_H
		32	# include "config.h"
		33	#endif
		34
1	#include <math.h>	35	#include <math.h>
2	#include <stdlib.h>	36	#include <stdlib.h>
		37	#include <unistd.h>
		38	#include <fcntl.h>
		39	#include <signal.h>
		40	#include <stddef.h>
3		41
4	#include <stdio.h>	42	#include <stdio.h>
5		43
		44	#include <assert.h>
6	#include <errno.h>	45	#include <errno.h>
		46	#include <sys/types.h>
		47	#include <sys/wait.h>
7	#include <sys/time.h>	48	#include <sys/time.h>
8	#include <time.h>	49	#include <time.h>
9		50
		51	/**/
		52
		53	#ifndef EV_USE_MONOTONIC
		54	# define EV_USE_MONOTONIC 1
		55	#endif
		56
		57	#ifndef EV_USE_SELECT
		58	# define EV_USE_SELECT 1
		59	#endif
		60
		61	#ifndef EV_USE_POLL
		62	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		63	#endif
		64
		65	#ifndef EV_USE_EPOLL
		66	# define EV_USE_EPOLL 0
		67	#endif
		68
		69	#ifndef EV_USE_REALTIME
		70	# define EV_USE_REALTIME 1
		71	#endif
		72
		73	/**/
		74
10	#ifdef CLOCK_MONOTONIC	75	#ifndef CLOCK_MONOTONIC
		76	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	77	# define EV_USE_MONOTONIC 0
12	#endif	78	#endif
13		79
14	#define HAVE_EPOLL 1	80	#ifndef CLOCK_REALTIME
		81	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	82	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	83	#endif
17		84
18	#define MAX_BLOCKTIME 60.	85	/**/
		86
		87	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		88	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		89	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		90	/#define CLEANUP_INTERVAL 300. / how often to try to free memory and re-check fds */
19		91
20	#include "ev.h"	92	#include "ev.h"
21		93
		94	#if __GNUC__ >= 3
		95	# define expect(expr,value) __builtin_expect ((expr),(value))
		96	# define inline inline
		97	#else
		98	# define expect(expr,value) (expr)
		99	# define inline static
		100	#endif
		101
		102	#define expect_false(expr) expect ((expr) != 0, 0)
		103	#define expect_true(expr) expect ((expr) != 0, 1)
		104
		105	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		106	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		107
22	struct ev_watcher {	108	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	109	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	110	typedef struct ev_watcher_time *WT;
28	};
29		111
		112	static ev_tstamp now_floor, now, diff; /* monotonic clock */
30	ev_tstamp ev_now;	113	ev_tstamp ev_now;
31	int ev_method;	114	int ev_method;
32		115
33	static int have_monotonic; /* runtime */	116	static int have_monotonic; /* runtime */
34		117
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	118	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
36	static void (*method_reify)(void);	119	static void (*method_modify)(int fd, int oev, int nev);
37	static void (*method_poll)(ev_tstamp timeout);	120	static void (*method_poll)(ev_tstamp timeout);
		121
		122	/*****************************************************************************/
38		123
39	ev_tstamp	124	ev_tstamp
40	ev_time (void)	125	ev_time (void)
41	{	126	{
42	#if HAVE_REALTIME	127	#if EV_USE_REALTIME
43	struct timespec ts;	128	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	129	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	130	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	131	#else
47	struct timeval tv;	132	struct timeval tv;
51	}	136	}
52		137
53	static ev_tstamp	138	static ev_tstamp
54	get_clock (void)	139	get_clock (void)
55	{	140	{
56	#if HAVE_MONOTONIC	141	#if EV_USE_MONOTONIC
57	if (have_monotonic)	142	if (expect_true (have_monotonic))
58	{	143	{
59	struct timespec ts;	144	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	145	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	146	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	147	}
63	#endif	148	#endif
64		149
65	return ev_time ();	150	return ev_time ();
66	}	151	}
67		152
		153	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		154
68	#define array_needsize(base,cur,cnt,init) \	155	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	156	if (expect_false ((cnt) > cur)) \
70	{ \	157	{ \
71	int newcnt = cur; \	158	int newcnt = cur; \
72	do \	159	do \
73	{ \	160	{ \
74	newcnt += (newcnt >> 1) + 16; \	161	newcnt = array_roundsize (base, newcnt << 1); \
75	} \	162	} \
76	while ((cnt) > newcnt); \	163	while ((cnt) > newcnt); \
77	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	164	\
78	base = realloc (base, sizeof (base) (newcnt)); \	165	base = realloc (base, sizeof (base) (newcnt)); \
79	init (base + cur, newcnt - cur); \	166	init (base + cur, newcnt - cur); \
80	cur = newcnt; \	167	cur = newcnt; \
81	}	168	}
82		169
		170	/*****************************************************************************/
		171
83	typedef struct	172	typedef struct
84	{	173	{
85	struct ev_io *head;	174	struct ev_io *head;
86	unsigned char wev, rev; /* want, received event set */	175	unsigned char events;
		176	unsigned char reify;
87	} ANFD;	177	} ANFD;
88		178
89	static ANFD *anfds;	179	static ANFD *anfds;
90	static int anfdmax;	180	static int anfdmax;
91		181
		182	static void
		183	anfds_init (ANFD *base, int count)
		184	{
		185	while (count--)
		186	{
		187	base->head = 0;
		188	base->events = EV_NONE;
		189	base->reify = 0;
		190
		191	++base;
		192	}
		193	}
		194
		195	typedef struct
		196	{
		197	W w;
		198	int events;
		199	} ANPENDING;
		200
		201	static ANPENDING *pendings [NUMPRI];
		202	static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
		203
		204	static void
		205	event (W w, int events)
		206	{
		207	if (w->pending)
		208	{
		209	pendings [ABSPRI (w)][w->pending - 1].events \|= events;
		210	return;
		211	}
		212
		213	w->pending = ++pendingcnt [ABSPRI (w)];
		214	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
		215	pendings [ABSPRI (w)][w->pending - 1].w = w;
		216	pendings [ABSPRI (w)][w->pending - 1].events = events;
		217	}
		218
		219	static void
		220	queue_events (W *events, int eventcnt, int type)
		221	{
		222	int i;
		223
		224	for (i = 0; i < eventcnt; ++i)
		225	event (events [i], type);
		226	}
		227
		228	static void
		229	fd_event (int fd, int events)
		230	{
		231	ANFD *anfd = anfds + fd;
		232	struct ev_io *w;
		233
		234	for (w = anfd->head; w; w = w->next)
		235	{
		236	int ev = w->events & events;
		237
		238	if (ev)
		239	event ((W)w, ev);
		240	}
		241	}
		242
		243	/*****************************************************************************/
		244
92	static int *fdchanges;	245	static int *fdchanges;
93	static int fdchangemax, fdchangecnt;	246	static int fdchangemax, fdchangecnt;
94		247
95	static void	248	static void
96	anfds_init (ANFD *base, int count)	249	fd_reify (void)
97	{	250	{
98	while (count--)	251	int i;
99	{	252
100	base->head = 0;	253	for (i = 0; i < fdchangecnt; ++i)
101	base->wev = base->rev = EV_NONE;
102	++base;
103	}	254	{
104	}	255	int fd = fdchanges [i];
105
106	typedef struct
107	{
108	struct ev_watcher *w;
109	int events;
110	} ANPENDING;
111
112	static ANPENDING *pendings;
113	static int pendingmax, pendingcnt;
114
115	static void
116	event (struct ev_watcher *w, int events)
117	{
118	w->pending = ++pendingcnt;
119	array_needsize (pendings, pendingmax, pendingcnt, );
120	pendings [pendingcnt - 1].w = w;
121	pendings [pendingcnt - 1].events = events;
122	}
123
124	static void
125	fd_event (int fd, int events)
126	{
127	ANFD *anfd = anfds + fd;	256	ANFD *anfd = anfds + fd;
		257	struct ev_io *w;
		258
		259	int events = 0;
		260
		261	for (w = anfd->head; w; w = w->next)
		262	events \|= w->events;
		263
		264	anfd->reify = 0;
		265
		266	if (anfd->events != events)
		267	{
		268	method_modify (fd, anfd->events, events);
		269	anfd->events = events;
		270	}
		271	}
		272
		273	fdchangecnt = 0;
		274	}
		275
		276	static void
		277	fd_change (int fd)
		278	{
		279	if (anfds [fd].reify \|\| fdchangecnt < 0)
		280	return;
		281
		282	anfds [fd].reify = 1;
		283
		284	++fdchangecnt;
		285	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		286	fdchanges [fdchangecnt - 1] = fd;
		287	}
		288
		289	static void
		290	fd_kill (int fd)
		291	{
128	struct ev_io *w;	292	struct ev_io *w;
129		293
130	for (w = anfd->head; w; w = w->next)	294	printf ("killing fd %d\n", fd);//D
		295	while ((w = anfds [fd].head))
		296	{
		297	ev_io_stop (w);
		298	event ((W)w, EV_ERROR \| EV_READ \| EV_WRITE);
		299	}
		300	}
		301
		302	/* called on EBADF to verify fds */
		303	static void
		304	fd_ebadf (void)
		305	{
		306	int fd;
		307
		308	for (fd = 0; fd < anfdmax; ++fd)
		309	if (anfds [fd].events)
		310	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		311	fd_kill (fd);
		312	}
		313
		314	/* called on ENOMEM in select/poll to kill some fds and retry */
		315	static void
		316	fd_enomem (void)
		317	{
		318	int fd = anfdmax;
		319
		320	while (fd--)
		321	if (anfds [fd].events)
131	{	322	{
132	int ev = w->events & events;	323	close (fd);
133		324	fd_kill (fd);
134	if (ev)	325	return;
135	event ((struct ev_watcher *)w, ev);
136	}	326	}
137	}	327	}
		328
		329	/*****************************************************************************/
138		330
139	static struct ev_timer **timers;	331	static struct ev_timer **timers;
140	static int timermax, timercnt;	332	static int timermax, timercnt;
141		333
		334	static struct ev_periodic **periodics;
		335	static int periodicmax, periodiccnt;
		336
142	static void	337	static void
143	upheap (int k)	338	upheap (WT *timers, int k)
144	{	339	{
145	struct ev_timer *w = timers [k];	340	WT w = timers [k];
146		341
147	while (k && timers [k >> 1]->at > w->at)	342	while (k && timers [k >> 1]->at > w->at)
148	{	343	{
149	timers [k] = timers [k >> 1];	344	timers [k] = timers [k >> 1];
150	timers [k]->active = k + 1;	345	timers [k]->active = k + 1;
…		…
155	timers [k]->active = k + 1;	350	timers [k]->active = k + 1;
156		351
157	}	352	}
158		353
159	static void	354	static void
160	downheap (int k)	355	downheap (WT *timers, int N, int k)
161	{	356	{
162	struct ev_timer *w = timers [k];	357	WT w = timers [k];
163		358
164	while (k <= (timercnt >> 1))	359	while (k < (N >> 1))
165	{	360	{
166	int j = k << 1;	361	int j = k << 1;
167		362
168	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	363	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
169	++j;	364	++j;
170		365
171	if (w->at <= timers [j]->at)	366	if (w->at <= timers [j]->at)
172	break;	367	break;
173		368
174	timers [k] = timers [j];	369	timers [k] = timers [j];
175	timers [k]->active = k;	370	timers [k]->active = k + 1;
176	k = j;	371	k = j;
177	}	372	}
178		373
179	timers [k] = w;	374	timers [k] = w;
180	timers [k]->active = k + 1;	375	timers [k]->active = k + 1;
181	}	376	}
182		377
183	static struct ev_signal **signals;	378	/*****************************************************************************/
		379
		380	typedef struct
		381	{
		382	struct ev_signal *head;
		383	sig_atomic_t volatile gotsig;
		384	} ANSIG;
		385
		386	static ANSIG *signals;
184	static int signalmax, signalcnt;	387	static int signalmax;
185		388
		389	static int sigpipe [2];
		390	static sig_atomic_t volatile gotsig;
		391	static struct ev_io sigev;
		392
186	static void	393	static void
187	signals_init (struct ev_signal **base, int count)	394	signals_init (ANSIG *base, int count)
188	{	395	{
189	while (count--)	396	while (count--)
190	*base++ = 0;	397	{
191	}	398	base->head = 0;
		399	base->gotsig = 0;
192		400
		401	++base;
		402	}
		403	}
		404
		405	static void
		406	sighandler (int signum)
		407	{
		408	signals [signum - 1].gotsig = 1;
		409
		410	if (!gotsig)
		411	{
		412	gotsig = 1;
		413	write (sigpipe [1], &signum, 1);
		414	}
		415	}
		416
		417	static void
		418	sigcb (struct ev_io *iow, int revents)
		419	{
		420	struct ev_signal *w;
		421	int signum;
		422
		423	read (sigpipe [0], &revents, 1);
		424	gotsig = 0;
		425
		426	for (signum = signalmax; signum--; )
		427	if (signals [signum].gotsig)
		428	{
		429	signals [signum].gotsig = 0;
		430
		431	for (w = signals [signum].head; w; w = w->next)
		432	event ((W)w, EV_SIGNAL);
		433	}
		434	}
		435
		436	static void
		437	siginit (void)
		438	{
		439	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		440	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		441
		442	/* rather than sort out wether we really need nb, set it */
		443	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		444	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		445
		446	ev_io_set (&sigev, sigpipe [0], EV_READ);
		447	ev_io_start (&sigev);
		448	}
		449
		450	/*****************************************************************************/
		451
		452	static struct ev_idle **idles;
		453	static int idlemax, idlecnt;
		454
		455	static struct ev_prepare **prepares;
		456	static int preparemax, preparecnt;
		457
		458	static struct ev_check **checks;
		459	static int checkmax, checkcnt;
		460
		461	/*****************************************************************************/
		462
		463	static struct ev_child *childs [PID_HASHSIZE];
		464	static struct ev_signal childev;
		465
		466	#ifndef WCONTINUED
		467	# define WCONTINUED 0
		468	#endif
		469
		470	static void
		471	childcb (struct ev_signal *sw, int revents)
		472	{
		473	struct ev_child *w;
		474	int pid, status;
		475
		476	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		477	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		478	if (w->pid == pid \|\| !w->pid)
		479	{
		480	w->status = status;
		481	event ((W)w, EV_CHILD);
		482	}
		483	}
		484
		485	/*****************************************************************************/
		486
193	#if HAVE_EPOLL	487	#if EV_USE_EPOLL
194	# include "ev_epoll.c"	488	# include "ev_epoll.c"
195	#endif	489	#endif
		490	#if EV_USE_POLL
		491	# include "ev_poll.c"
		492	#endif
196	#if HAVE_SELECT	493	#if EV_USE_SELECT
197	# include "ev_select.c"	494	# include "ev_select.c"
198	#endif	495	#endif
199		496
		497	int
		498	ev_version_major (void)
		499	{
		500	return EV_VERSION_MAJOR;
		501	}
		502
		503	int
		504	ev_version_minor (void)
		505	{
		506	return EV_VERSION_MINOR;
		507	}
		508
		509	/* return true if we are running with elevated privileges and ignore env variables */
		510	static int
		511	enable_secure ()
		512	{
		513	return getuid () != geteuid ()
		514	\|\| getgid () != getegid ();
		515	}
		516
200	int ev_init (int flags)	517	int ev_init (int methods)
201	{	518	{
		519	if (!ev_method)
		520	{
202	#if HAVE_MONOTONIC	521	#if EV_USE_MONOTONIC
203	{	522	{
204	struct timespec ts;	523	struct timespec ts;
205	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	524	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
206	have_monotonic = 1;	525	have_monotonic = 1;
207	}	526	}
208	#endif	527	#endif
209		528
210	ev_now = ev_time ();	529	ev_now = ev_time ();
		530	now = get_clock ();
		531	now_floor = now;
		532	diff = ev_now - now;
211		533
		534	if (pipe (sigpipe))
		535	return 0;
		536
		537	if (methods == EVMETHOD_AUTO)
		538	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		539	methods = atoi (getenv ("LIBEV_METHODS"));
		540	else
		541	methods = EVMETHOD_ANY;
		542
		543	ev_method = 0;
212	#if HAVE_EPOLL	544	#if EV_USE_EPOLL
213	if (epoll_init (flags))	545	if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods);
214	return ev_method;
215	#endif	546	#endif
		547	#if EV_USE_POLL
		548	if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
		549	#endif
216	#if HAVE_SELECT	550	#if EV_USE_SELECT
217	if (select_init (flags))	551	if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
218	return ev_method;
219	#endif	552	#endif
220		553
221	ev_method = EVMETHOD_NONE;	554	if (ev_method)
		555	{
		556	ev_watcher_init (&sigev, sigcb);
		557	siginit ();
		558
		559	ev_signal_init (&childev, childcb, SIGCHLD);
		560	ev_signal_start (&childev);
		561	}
		562	}
		563
222	return ev_method;	564	return ev_method;
223	}	565	}
224		566
225	void ev_prefork (void)	567	/*****************************************************************************/
226	{
227	}
228		568
		569	void
		570	ev_fork_prepare (void)
		571	{
		572	/* nop */
		573	}
		574
		575	void
229	void ev_postfork_parent (void)	576	ev_fork_parent (void)
230	{	577	{
		578	/* nop */
231	}	579	}
232		580
		581	void
233	void ev_postfork_child (void)	582	ev_fork_child (void)
234	{	583	{
235	#if HAVE_EPOLL	584	#if EV_USE_EPOLL
		585	if (ev_method == EVMETHOD_EPOLL)
236	epoll_postfork_child ();	586	epoll_postfork_child ();
237	#endif	587	#endif
238	}
239		588
		589	ev_io_stop (&sigev);
		590	close (sigpipe [0]);
		591	close (sigpipe [1]);
		592	pipe (sigpipe);
		593	siginit ();
		594	}
		595
		596	/*****************************************************************************/
		597
240	static void	598	static void
241	call_pending ()	599	call_pending (void)
		600	{
		601	int pri;
		602
		603	for (pri = NUMPRI; pri--; )
		604	while (pendingcnt [pri])
		605	{
		606	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		607
		608	if (p->w)
		609	{
		610	p->w->pending = 0;
		611	p->w->cb (p->w, p->events);
		612	}
		613	}
		614	}
		615
		616	static void
		617	timers_reify (void)
		618	{
		619	while (timercnt && timers [0]->at <= now)
		620	{
		621	struct ev_timer *w = timers [0];
		622
		623	/* first reschedule or stop timer */
		624	if (w->repeat)
		625	{
		626	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
		627	w->at = now + w->repeat;
		628	downheap ((WT *)timers, timercnt, 0);
		629	}
		630	else
		631	ev_timer_stop (w); /* nonrepeating: stop timer */
		632
		633	event ((W)w, EV_TIMEOUT);
		634	}
		635	}
		636
		637	static void
		638	periodics_reify (void)
		639	{
		640	while (periodiccnt && periodics [0]->at <= ev_now)
		641	{
		642	struct ev_periodic *w = periodics [0];
		643
		644	/* first reschedule or stop timer */
		645	if (w->interval)
		646	{
		647	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		648	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
		649	downheap ((WT *)periodics, periodiccnt, 0);
		650	}
		651	else
		652	ev_periodic_stop (w); /* nonrepeating: stop timer */
		653
		654	event ((W)w, EV_PERIODIC);
		655	}
		656	}
		657
		658	static void
		659	periodics_reschedule (ev_tstamp diff)
242	{	660	{
243	int i;	661	int i;
244		662
		663	/* adjust periodics after time jump */
245	for (i = 0; i < pendingcnt; ++i)	664	for (i = 0; i < periodiccnt; ++i)
246	{	665	{
247	ANPENDING *p = pendings + i;	666	struct ev_periodic *w = periodics [i];
248		667
249	if (p->w)	668	if (w->interval)
250	{
251	p->w->pending = 0;
252	p->w->cb (p->w, p->events);
253	}	669	{
254	}	670	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
255		671
256	pendingcnt = 0;	672	if (fabs (diff) >= 1e-4)
257	}	673	{
		674	ev_periodic_stop (w);
		675	ev_periodic_start (w);
258		676
259	static void	677	i = 0; /* restart loop, inefficient, but time jumps should be rare */
260	timer_reify (void)	678	}
261	{
262	while (timercnt && timers [0]->at <= ev_now)
263	{
264	struct ev_timer *w = timers [0];
265
266	/* first reschedule timer */
267	if (w->repeat)
268	{	679	}
269	fprintf (stderr, "a %f now %f repeat %f, %f\n", w->at, ev_now, w->repeat, w->repeat *1e30);//D	680	}
270	if (w->is_abs)	681	}
271	w->at += floor ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
272	else
273	w->at = ev_now + w->repeat;
274		682
275	fprintf (stderr, "b %f\n", w->at);//D	683	static int
		684	time_update_monotonic (void)
		685	{
		686	now = get_clock ();
276		687
277	downheap (0);	688	if (expect_true (now - now_floor < MIN_TIMEJUMP * .5))
		689	{
		690	ev_now = now + diff;
		691	return 0;
		692	}
		693	else
		694	{
		695	now_floor = now;
		696	ev_now = ev_time ();
		697	return 1;
		698	}
		699	}
		700
		701	static void
		702	time_update (void)
		703	{
		704	int i;
		705
		706	#if EV_USE_MONOTONIC
		707	if (expect_true (have_monotonic))
		708	{
		709	if (time_update_monotonic ())
278	}	710	{
		711	ev_tstamp odiff = diff;
		712
		713	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		714	{
		715	diff = ev_now - now;
		716
		717	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		718	return; /* all is well */
		719
		720	ev_now = ev_time ();
		721	now = get_clock ();
		722	now_floor = now;
		723	}
		724
		725	periodics_reschedule (diff - odiff);
		726	/* no timer adjustment, as the monotonic clock doesn't jump */
		727	}
		728	}
		729	else
		730	#endif
		731	{
		732	ev_now = ev_time ();
		733
		734	if (expect_false (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		735	{
		736	periodics_reschedule (ev_now - now);
		737
		738	/* adjust timers. this is easy, as the offset is the same for all */
		739	for (i = 0; i < timercnt; ++i)
		740	timers [i]->at += diff;
		741	}
		742
		743	now = ev_now;
		744	}
		745	}
		746
		747	int ev_loop_done;
		748
		749	void ev_loop (int flags)
		750	{
		751	double block;
		752	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
		753
		754	do
		755	{
		756	/* queue check watchers (and execute them) */
		757	if (expect_false (preparecnt))
		758	{
		759	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		760	call_pending ();
		761	}
		762
		763	/* update fd-related kernel structures */
		764	fd_reify ();
		765
		766	/* calculate blocking time */
		767
		768	/* we only need this for !monotonic clockor timers, but as we basically
		769	always have timers, we just calculate it always */
		770	#if EV_USE_MONOTONIC
		771	if (expect_true (have_monotonic))
		772	time_update_monotonic ();
279	else	773	else
280	evtimer_stop (w); /* nonrepeating: stop timer */	774	#endif
281		775	{
282	event ((struct ev_watcher *)w, EV_TIMEOUT);
283	}
284	}
285
286	int ev_loop_done;
287
288	int ev_loop (int flags)
289	{
290	double block;
291	ev_loop_done = flags & EVLOOP_ONESHOT;
292
293	do
294	{
295	/* update fd-related kernel structures */
296	method_reify (); fdchangecnt = 0;
297
298	/* calculate blocking time */
299	ev_now = ev_time ();	776	ev_now = ev_time ();
		777	now = ev_now;
		778	}
300		779
301	if (flags & EVLOOP_NONBLOCK)	780	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
302	block = 0.;	781	block = 0.;
303	else if (!timercnt)
304	block = MAX_BLOCKTIME;
305	else	782	else
306	{	783	{
		784	block = MAX_BLOCKTIME;
		785
		786	if (timercnt)
		787	{
307	block = timers [0]->at - ev_now + method_fudge;	788	ev_tstamp to = timers [0]->at - now + method_fudge;
		789	if (block > to) block = to;
		790	}
		791
		792	if (periodiccnt)
		793	{
		794	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
		795	if (block > to) block = to;
		796	}
		797
308	if (block < 0.) block = 0.;	798	if (block < 0.) block = 0.;
309	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
310	}	799	}
311		800
312	fprintf (stderr, "block %f\n", block);//D
313	method_poll (block);	801	method_poll (block);
314		802
		803	/* update ev_now, do magic */
		804	time_update ();
		805
315	/* put pending timers into pendign queue and reschedule them */	806	/* queue pending timers and reschedule them */
316	timer_reify ();	807	timers_reify (); /* relative timers called last */
		808	periodics_reify (); /* absolute timers called first */
317		809
318	ev_now = ev_time ();	810	/* queue idle watchers unless io or timers are pending */
		811	if (!pendingcnt)
		812	queue_events ((W *)idles, idlecnt, EV_IDLE);
		813
		814	/* queue check watchers, to be executed first */
		815	if (checkcnt)
		816	queue_events ((W *)checks, checkcnt, EV_CHECK);
		817
319	call_pending ();	818	call_pending ();
320	}	819	}
321	while (!ev_loop_done);	820	while (!ev_loop_done);
322	}
323		821
		822	if (ev_loop_done != 2)
		823	ev_loop_done = 0;
		824	}
		825
		826	/*****************************************************************************/
		827
324	static void	828	static void
325	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	829	wlist_add (WL *head, WL elem)
326	{	830	{
327	elem->next = *head;	831	elem->next = *head;
328	*head = elem;	832	*head = elem;
329	}	833	}
330		834
331	static void	835	static void
332	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	836	wlist_del (WL *head, WL elem)
333	{	837	{
334	while (*head)	838	while (*head)
335	{	839	{
336	if (*head == elem)	840	if (*head == elem)
337	{	841	{
…		…
342	head = &(*head)->next;	846	head = &(*head)->next;
343	}	847	}
344	}	848	}
345		849
346	static void	850	static void
347	ev_start (struct ev_watcher *w, int active)	851	ev_clear_pending (W w)
348	{	852	{
		853	if (w->pending)
		854	{
		855	pendings [ABSPRI (w)][w->pending - 1].w = 0;
349	w->pending = 0;	856	w->pending = 0;
		857	}
		858	}
		859
		860	static void
		861	ev_start (W w, int active)
		862	{
350	w->active = active;	863	w->active = active;
351	}	864	}
352		865
353	static void	866	static void
354	ev_stop (struct ev_watcher *w)	867	ev_stop (W w)
355	{	868	{
356	if (w->pending)
357	pendings [w->pending - 1].w = 0;
358
359	w->active = 0;	869	w->active = 0;
360	/* nop */
361	}	870	}
362		871
		872	/*****************************************************************************/
		873
363	void	874	void
364	evio_start (struct ev_io *w)	875	ev_io_start (struct ev_io *w)
365	{	876	{
		877	int fd = w->fd;
		878
366	if (ev_is_active (w))	879	if (ev_is_active (w))
367	return;	880	return;
368		881
369	int fd = w->fd;	882	assert (("ev_io_start called with negative fd", fd >= 0));
370		883
371	ev_start ((struct ev_watcher *)w, 1);	884	ev_start ((W)w, 1);
372	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	885	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
373	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	886	wlist_add ((WL *)&anfds[fd].head, (WL)w);
374		887
375	++fdchangecnt;	888	fd_change (fd);
376	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
377	fdchanges [fdchangecnt - 1] = fd;
378	}	889	}
379		890
380	void	891	void
381	evio_stop (struct ev_io *w)	892	ev_io_stop (struct ev_io *w)
382	{	893	{
		894	ev_clear_pending ((W)w);
383	if (!ev_is_active (w))	895	if (!ev_is_active (w))
384	return;	896	return;
385		897
386	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	898	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
387	ev_stop ((struct ev_watcher *)w);	899	ev_stop ((W)w);
388		900
389	++fdchangecnt;	901	fd_change (w->fd);
390	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
391	fdchanges [fdchangecnt - 1] = w->fd;
392	}	902	}
393		903
394	void	904	void
395	evtimer_start (struct ev_timer *w)	905	ev_timer_start (struct ev_timer *w)
396	{	906	{
397	if (ev_is_active (w))	907	if (ev_is_active (w))
398	return;	908	return;
399		909
400	fprintf (stderr, "t1 %f a %d\n", w->at, w->is_abs);//D
401	if (w->is_abs)
402	{
403	if (w->repeat)
404	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
405	}
406	else
407	w->at += ev_now;	910	w->at += now;
408	fprintf (stderr, "t2 %f a %d\n", w->at, w->is_abs);//D
409		911
410	ev_start ((struct ev_watcher *)w, ++timercnt);	912	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		913
		914	ev_start ((W)w, ++timercnt);
411	array_needsize (timers, timermax, timercnt, );	915	array_needsize (timers, timermax, timercnt, );
412	timers [timercnt - 1] = w;	916	timers [timercnt - 1] = w;
413	upheap (timercnt - 1);	917	upheap ((WT *)timers, timercnt - 1);
414	}	918	}
415		919
416	void	920	void
417	evtimer_stop (struct ev_timer *w)	921	ev_timer_stop (struct ev_timer *w)
418	{	922	{
		923	ev_clear_pending ((W)w);
419	if (!ev_is_active (w))	924	if (!ev_is_active (w))
420	return;	925	return;
421		926
		927	if (w->active < timercnt--)
		928	{
422	timers [w->active - 1] = timers [--timercnt];	929	timers [w->active - 1] = timers [timercnt];
423	downheap (w->active - 1);	930	downheap ((WT *)timers, timercnt, w->active - 1);
424	ev_stop ((struct ev_watcher *)w);	931	}
425	}
426		932
		933	w->at = w->repeat;
		934
		935	ev_stop ((W)w);
		936	}
		937
427	void	938	void
428	evsignal_start (struct ev_signal *w)	939	ev_timer_again (struct ev_timer *w)
429	{	940	{
430	if (ev_is_active (w))	941	if (ev_is_active (w))
431	return;	942	{
		943	if (w->repeat)
		944	{
		945	w->at = now + w->repeat;
		946	downheap ((WT *)timers, timercnt, w->active - 1);
		947	}
		948	else
		949	ev_timer_stop (w);
		950	}
		951	else if (w->repeat)
		952	ev_timer_start (w);
		953	}
432		954
433	ev_start ((struct ev_watcher *)w, 1);	955	void
		956	ev_periodic_start (struct ev_periodic *w)
		957	{
		958	if (ev_is_active (w))
		959	return;
		960
		961	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		962
		963	/* this formula differs from the one in periodic_reify because we do not always round up */
		964	if (w->interval)
		965	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		966
		967	ev_start ((W)w, ++periodiccnt);
		968	array_needsize (periodics, periodicmax, periodiccnt, );
		969	periodics [periodiccnt - 1] = w;
		970	upheap ((WT *)periodics, periodiccnt - 1);
		971	}
		972
		973	void
		974	ev_periodic_stop (struct ev_periodic *w)
		975	{
		976	ev_clear_pending ((W)w);
		977	if (!ev_is_active (w))
		978	return;
		979
		980	if (w->active < periodiccnt--)
		981	{
		982	periodics [w->active - 1] = periodics [periodiccnt];
		983	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		984	}
		985
		986	ev_stop ((W)w);
		987	}
		988
		989	void
		990	ev_signal_start (struct ev_signal *w)
		991	{
		992	if (ev_is_active (w))
		993	return;
		994
		995	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		996
		997	ev_start ((W)w, 1);
434	array_needsize (signals, signalmax, w->signum, signals_init);	998	array_needsize (signals, signalmax, w->signum, signals_init);
435	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	999	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
436	}
437		1000
		1001	if (!w->next)
		1002	{
		1003	struct sigaction sa;
		1004	sa.sa_handler = sighandler;
		1005	sigfillset (&sa.sa_mask);
		1006	sa.sa_flags = 0;
		1007	sigaction (w->signum, &sa, 0);
		1008	}
		1009	}
		1010
438	void	1011	void
439	evsignal_stop (struct ev_signal *w)	1012	ev_signal_stop (struct ev_signal *w)
440	{	1013	{
		1014	ev_clear_pending ((W)w);
441	if (!ev_is_active (w))	1015	if (!ev_is_active (w))
442	return;	1016	return;
443		1017
444	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	1018	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1019	ev_stop ((W)w);
		1020
		1021	if (!signals [w->signum - 1].head)
		1022	signal (w->signum, SIG_DFL);
		1023	}
		1024
		1025	void
		1026	ev_idle_start (struct ev_idle *w)
		1027	{
		1028	if (ev_is_active (w))
		1029	return;
		1030
		1031	ev_start ((W)w, ++idlecnt);
		1032	array_needsize (idles, idlemax, idlecnt, );
		1033	idles [idlecnt - 1] = w;
		1034	}
		1035
		1036	void
		1037	ev_idle_stop (struct ev_idle *w)
		1038	{
		1039	ev_clear_pending ((W)w);
		1040	if (ev_is_active (w))
		1041	return;
		1042
		1043	idles [w->active - 1] = idles [--idlecnt];
		1044	ev_stop ((W)w);
		1045	}
		1046
		1047	void
		1048	ev_prepare_start (struct ev_prepare *w)
		1049	{
		1050	if (ev_is_active (w))
		1051	return;
		1052
		1053	ev_start ((W)w, ++preparecnt);
		1054	array_needsize (prepares, preparemax, preparecnt, );
		1055	prepares [preparecnt - 1] = w;
		1056	}
		1057
		1058	void
		1059	ev_prepare_stop (struct ev_prepare *w)
		1060	{
		1061	ev_clear_pending ((W)w);
		1062	if (ev_is_active (w))
		1063	return;
		1064
		1065	prepares [w->active - 1] = prepares [--preparecnt];
		1066	ev_stop ((W)w);
		1067	}
		1068
		1069	void
		1070	ev_check_start (struct ev_check *w)
		1071	{
		1072	if (ev_is_active (w))
		1073	return;
		1074
		1075	ev_start ((W)w, ++checkcnt);
		1076	array_needsize (checks, checkmax, checkcnt, );
		1077	checks [checkcnt - 1] = w;
		1078	}
		1079
		1080	void
445	ev_stop ((struct ev_watcher *)w);	1081	ev_check_stop (struct ev_check *w)
446	}	1082	{
		1083	ev_clear_pending ((W)w);
		1084	if (ev_is_active (w))
		1085	return;
447		1086
		1087	checks [w->active - 1] = checks [--checkcnt];
		1088	ev_stop ((W)w);
		1089	}
		1090
		1091	void
		1092	ev_child_start (struct ev_child *w)
		1093	{
		1094	if (ev_is_active (w))
		1095	return;
		1096
		1097	ev_start ((W)w, 1);
		1098	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1099	}
		1100
		1101	void
		1102	ev_child_stop (struct ev_child *w)
		1103	{
		1104	ev_clear_pending ((W)w);
		1105	if (ev_is_active (w))
		1106	return;
		1107
		1108	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1109	ev_stop ((W)w);
		1110	}
		1111
448	/*****************************************************************************/	1112	/*****************************************************************************/
		1113
		1114	struct ev_once
		1115	{
		1116	struct ev_io io;
		1117	struct ev_timer to;
		1118	void (cb)(int revents, void arg);
		1119	void *arg;
		1120	};
		1121
		1122	static void
		1123	once_cb (struct ev_once *once, int revents)
		1124	{
		1125	void (cb)(int revents, void arg) = once->cb;
		1126	void *arg = once->arg;
		1127
		1128	ev_io_stop (&once->io);
		1129	ev_timer_stop (&once->to);
		1130	free (once);
		1131
		1132	cb (revents, arg);
		1133	}
		1134
		1135	static void
		1136	once_cb_io (struct ev_io *w, int revents)
		1137	{
		1138	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1139	}
		1140
		1141	static void
		1142	once_cb_to (struct ev_timer *w, int revents)
		1143	{
		1144	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1145	}
		1146
		1147	void
		1148	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1149	{
		1150	struct ev_once *once = malloc (sizeof (struct ev_once));
		1151
		1152	if (!once)
		1153	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1154	else
		1155	{
		1156	once->cb = cb;
		1157	once->arg = arg;
		1158
		1159	ev_watcher_init (&once->io, once_cb_io);
		1160	if (fd >= 0)
		1161	{
		1162	ev_io_set (&once->io, fd, events);
		1163	ev_io_start (&once->io);
		1164	}
		1165
		1166	ev_watcher_init (&once->to, once_cb_to);
		1167	if (timeout >= 0.)
		1168	{
		1169	ev_timer_set (&once->to, timeout, 0.);
		1170	ev_timer_start (&once->to);
		1171	}
		1172	}
		1173	}
		1174
		1175	/*****************************************************************************/
		1176
449	#if 1	1177	#if 0
		1178
		1179	struct ev_io wio;
450		1180
451	static void	1181	static void
452	sin_cb (struct ev_io *w, int revents)	1182	sin_cb (struct ev_io *w, int revents)
453	{	1183	{
454	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1184	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
455	}	1185	}
456		1186
457	static void	1187	static void
458	ocb (struct ev_timer *w, int revents)	1188	ocb (struct ev_timer *w, int revents)
459	{	1189	{
460	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1190	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1191	ev_timer_stop (w);
		1192	ev_timer_start (w);
		1193	}
		1194
		1195	static void
		1196	scb (struct ev_signal *w, int revents)
		1197	{
		1198	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1199	ev_io_stop (&wio);
		1200	ev_io_start (&wio);
		1201	}
		1202
		1203	static void
		1204	gcb (struct ev_signal *w, int revents)
		1205	{
		1206	fprintf (stderr, "generic %x\n", revents);
		1207
461	}	1208	}
462		1209
463	int main (void)	1210	int main (void)
464	{	1211	{
465	struct ev_io sin;
466
467	ev_init (0);	1212	ev_init (0);
468		1213
469	evw_init (&sin, sin_cb, 55);
470	evio_set (&sin, 0, EV_READ);	1214	ev_io_init (&wio, sin_cb, 0, EV_READ);
471	evio_start (&sin);	1215	ev_io_start (&wio);
		1216
		1217	struct ev_timer t[10000];
		1218
		1219	#if 0
		1220	int i;
		1221	for (i = 0; i < 10000; ++i)
		1222	{
		1223	struct ev_timer *w = t + i;
		1224	ev_watcher_init (w, ocb, i);
		1225	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
		1226	ev_timer_start (w);
		1227	if (drand48 () < 0.5)
		1228	ev_timer_stop (w);
		1229	}
		1230	#endif
472		1231
473	struct ev_timer t1;	1232	struct ev_timer t1;
474	evw_init (&t1, ocb, 1);	1233	ev_timer_init (&t1, ocb, 5, 10);
475	evtimer_set_rel (&t1, 1, 0);
476	evtimer_start (&t1);	1234	ev_timer_start (&t1);
477		1235
478	struct ev_timer t2;	1236	struct ev_signal sig;
479	evw_init (&t2, ocb, 2);	1237	ev_signal_init (&sig, scb, SIGQUIT);
480	evtimer_set_abs (&t2, ev_time () + 2, 0);	1238	ev_signal_start (&sig);
		1239
		1240	struct ev_check cw;
		1241	ev_check_init (&cw, gcb);
		1242	ev_check_start (&cw);
		1243
		1244	struct ev_idle iw;
		1245	ev_idle_init (&iw, gcb);
481	evtimer_start (&t2);	1246	ev_idle_start (&iw);
482		1247
483	ev_loop (0);	1248	ev_loop (0);
484		1249
485	return 0;	1250	return 0;
486	}	1251	}

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Comparing libev/ev.c (file contents): Revision 1.1 by root, Tue Oct 30 20:59:31 2007 UTC vs. Revision 1.42 by root, Fri Nov 2 20:05:05 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.1 by root, Tue Oct 30 20:59:31 2007 UTC vs.
Revision 1.42 by root, Fri Nov 2 20:05:05 2007 UTC