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

Comparing libev/ev.c (file contents):
Revision 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs.
Revision 1.43 by root, Fri Nov 2 20:21:33 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 ? cur << 1 : 16; \	158	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	159	do \
		160	{ \
		161	newcnt = array_roundsize (base, newcnt << 1); \
		162	} \
		163	while ((cnt) > newcnt); \
		164	\
73	base = realloc (base, sizeof (base) (newcnt)); \	165	base = realloc (base, sizeof (base) (newcnt)); \
74	init (base + cur, newcnt - cur); \	166	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	167	cur = newcnt; \
76	}	168	}
77		169
		170	/*****************************************************************************/
		171
78	typedef struct	172	typedef struct
79	{	173	{
80	struct ev_io *head;	174	struct ev_io *head;
81	unsigned char wev, rev; /* want, received event set */	175	unsigned char events;
		176	unsigned char reify;
82	} ANFD;	177	} ANFD;
83		178
84	static ANFD *anfds;	179	static ANFD *anfds;
85	static int anfdmax;	180	static int anfdmax;
86		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
87	static int *fdchanges;	245	static int *fdchanges;
88	static int fdchangemax, fdchangecnt;	246	static int fdchangemax, fdchangecnt;
89		247
90	static void	248	static void
91	anfds_init (ANFD *base, int count)	249	fd_reify (void)
92	{	250	{
93	while (count--)	251	int i;
94	{	252
95	base->head = 0;	253	for (i = 0; i < fdchangecnt; ++i)
96	base->wev = base->rev = EV_NONE;
97	++base;
98	}	254	{
99	}	255	int fd = fdchanges [i];
100
101	typedef struct
102	{
103	struct ev_watcher *w;
104	int events;
105	} ANPENDING;
106
107	static ANPENDING *pendings;
108	static int pendingmax, pendingcnt;
109
110	static void
111	event (struct ev_watcher *w, int events)
112	{
113	w->pending = ++pendingcnt;
114	array_needsize (pendings, pendingmax, pendingcnt, );
115	pendings [pendingcnt - 1].w = w;
116	pendings [pendingcnt - 1].events = events;
117	}
118
119	static void
120	fd_event (int fd, int events)
121	{
122	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	{
123	struct ev_io *w;	292	struct ev_io *w;
124		293
125	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)
126	{	322	{
127	int ev = w->events & events;	323	close (fd);
128		324	fd_kill (fd);
129	if (ev)	325	return;
130	event ((struct ev_watcher *)w, ev);
131	}	326	}
132	}	327	}
		328
		329	/*****************************************************************************/
133		330
134	static struct ev_timer **timers;	331	static struct ev_timer **timers;
135	static int timermax, timercnt;	332	static int timermax, timercnt;
136		333
		334	static struct ev_periodic **periodics;
		335	static int periodicmax, periodiccnt;
		336
137	static void	337	static void
138	upheap (int k)	338	upheap (WT *timers, int k)
139	{	339	{
140	struct ev_timer *w = timers [k];	340	WT w = timers [k];
141		341
142	while (k && timers [k >> 1]->at > w->at)	342	while (k && timers [k >> 1]->at > w->at)
143	{	343	{
144	timers [k] = timers [k >> 1];	344	timers [k] = timers [k >> 1];
145	timers [k]->active = k + 1;	345	timers [k]->active = k + 1;
…		…
150	timers [k]->active = k + 1;	350	timers [k]->active = k + 1;
151		351
152	}	352	}
153		353
154	static void	354	static void
155	downheap (int k)	355	downheap (WT *timers, int N, int k)
156	{	356	{
157	struct ev_timer *w = timers [k];	357	WT w = timers [k];
158		358
159	while (k < (timercnt >> 1))	359	while (k < (N >> 1))
160	{	360	{
161	int j = k << 1;	361	int j = k << 1;
162		362
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	363	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
164	++j;	364	++j;
165		365
166	if (w->at <= timers [j]->at)	366	if (w->at <= timers [j]->at)
167	break;	367	break;
168		368
…		…
173		373
174	timers [k] = w;	374	timers [k] = w;
175	timers [k]->active = k + 1;	375	timers [k]->active = k + 1;
176	}	376	}
177		377
178	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;
179	static int signalmax, signalcnt;	387	static int signalmax;
180		388
		389	static int sigpipe [2];
		390	static sig_atomic_t volatile gotsig;
		391	static struct ev_io sigev;
		392
181	static void	393	static void
182	signals_init (struct ev_signal **base, int count)	394	signals_init (ANSIG *base, int count)
183	{	395	{
184	while (count--)	396	while (count--)
185	*base++ = 0;	397	{
186	}	398	base->head = 0;
		399	base->gotsig = 0;
187		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
188	#if HAVE_EPOLL	487	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	488	# include "ev_epoll.c"
190	#endif	489	#endif
		490	#if EV_USE_POLL
		491	# include "ev_poll.c"
		492	#endif
191	#if HAVE_SELECT	493	#if EV_USE_SELECT
192	# include "ev_select.c"	494	# include "ev_select.c"
193	#endif	495	#endif
194		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
195	int ev_init (int flags)	517	int ev_init (int methods)
196	{	518	{
		519	if (!ev_method)
		520	{
197	#if HAVE_MONOTONIC	521	#if EV_USE_MONOTONIC
198	{	522	{
199	struct timespec ts;	523	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	524	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	525	have_monotonic = 1;
202	}	526	}
203	#endif	527	#endif
204		528
205	ev_now = ev_time ();	529	ev_now = ev_time ();
		530	now = get_clock ();
		531	now_floor = now;
		532	diff = ev_now - now;
206		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;
207	#if HAVE_EPOLL	544	#if EV_USE_EPOLL
208	if (epoll_init (flags))	545	if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods);
209	return ev_method;
210	#endif	546	#endif
		547	#if EV_USE_POLL
		548	if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
		549	#endif
211	#if HAVE_SELECT	550	#if EV_USE_SELECT
212	if (select_init (flags))	551	if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
213	return ev_method;
214	#endif	552	#endif
215		553
216	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
217	return ev_method;	564	return ev_method;
218	}	565	}
219		566
220	void ev_prefork (void)	567	/*****************************************************************************/
221	{
222	}
223		568
		569	void
		570	ev_fork_prepare (void)
		571	{
		572	/* nop */
		573	}
		574
		575	void
224	void ev_postfork_parent (void)	576	ev_fork_parent (void)
225	{	577	{
		578	/* nop */
226	}	579	}
227		580
		581	void
228	void ev_postfork_child (void)	582	ev_fork_child (void)
229	{	583	{
230	#if HAVE_EPOLL	584	#if EV_USE_EPOLL
		585	if (ev_method == EVMETHOD_EPOLL)
231	epoll_postfork_child ();	586	epoll_postfork_child ();
232	#endif	587	#endif
233	}
234		588
		589	ev_io_stop (&sigev);
		590	close (sigpipe [0]);
		591	close (sigpipe [1]);
		592	pipe (sigpipe);
		593	siginit ();
		594	}
		595
		596	/*****************************************************************************/
		597
235	static void	598	static void
236	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)
237	{	660	{
238	int i;	661	int i;
239		662
		663	/* adjust periodics after time jump */
240	for (i = 0; i < pendingcnt; ++i)	664	for (i = 0; i < periodiccnt; ++i)
241	{	665	{
242	ANPENDING *p = pendings + i;	666	struct ev_periodic *w = periodics [i];
243		667
244	if (p->w)	668	if (w->interval)
245	{
246	p->w->pending = 0;
247	p->w->cb (p->w, p->events);
248	}	669	{
249	}	670	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
250		671
251	pendingcnt = 0;	672	if (fabs (diff) >= 1e-4)
252	}	673	{
		674	ev_periodic_stop (w);
		675	ev_periodic_start (w);
253		676
254	static void	677	i = 0; /* restart loop, inefficient, but time jumps should be rare */
255	timer_reify (void)	678	}
256	{
257	while (timercnt && timers [0]->at <= ev_now)
258	{
259	struct ev_timer *w = timers [0];
260
261	/* first reschedule timer */
262	if (w->repeat)
263	{	679	}
264	if (w->is_abs)	680	}
265	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	681	}
266	else
267	w->at = ev_now + w->repeat;
268		682
269	downheap (0);	683	static int
		684	time_update_monotonic (void)
		685	{
		686	now = get_clock ();
		687
		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 ())
270	}	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 ();
271	else	773	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	774	#endif
273		775	{
274	event ((struct ev_watcher *)w, EV_TIMEOUT);
275	}
276	}
277
278	int ev_loop_done;
279
280	int ev_loop (int flags)
281	{
282	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;
284
285	do
286	{
287	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;
289
290	/* calculate blocking time */
291	ev_now = ev_time ();	776	ev_now = ev_time ();
		777	now = ev_now;
		778	}
292		779
293	if (flags & EVLOOP_NONBLOCK)	780	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
294	block = 0.;	781	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	782	else
298	{	783	{
		784	block = MAX_BLOCKTIME;
		785
		786	if (timercnt)
		787	{
299	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
300	if (block < 0.) block = 0.;	798	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	799	}
303		800
304	method_poll (block);	801	method_poll (block);
305		802
		803	/* update ev_now, do magic */
		804	time_update ();
		805
306	/* put pending timers into pendign queue and reschedule them */	806	/* queue pending timers and reschedule them */
307	timer_reify ();	807	timers_reify (); /* relative timers called last */
		808	periodics_reify (); /* absolute timers called first */
308		809
309	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
310	call_pending ();	818	call_pending ();
311	}	819	}
312	while (!ev_loop_done);	820	while (!ev_loop_done);
313	}
314		821
		822	if (ev_loop_done != 2)
		823	ev_loop_done = 0;
		824	}
		825
		826	/*****************************************************************************/
		827
315	static void	828	static void
316	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	829	wlist_add (WL *head, WL elem)
317	{	830	{
318	elem->next = *head;	831	elem->next = *head;
319	*head = elem;	832	*head = elem;
320	}	833	}
321		834
322	static void	835	static void
323	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	836	wlist_del (WL *head, WL elem)
324	{	837	{
325	while (*head)	838	while (*head)
326	{	839	{
327	if (*head == elem)	840	if (*head == elem)
328	{	841	{
…		…
333	head = &(*head)->next;	846	head = &(*head)->next;
334	}	847	}
335	}	848	}
336		849
337	static void	850	static void
338	ev_start (struct ev_watcher *w, int active)	851	ev_clear_pending (W w)
339	{	852	{
		853	if (w->pending)
		854	{
		855	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	856	w->pending = 0;
		857	}
		858	}
		859
		860	static void
		861	ev_start (W w, int active)
		862	{
		863	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		864	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		865
341	w->active = active;	866	w->active = active;
342	}	867	}
343		868
344	static void	869	static void
345	ev_stop (struct ev_watcher *w)	870	ev_stop (W w)
346	{	871	{
347	if (w->pending)
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	872	w->active = 0;
351	/* nop */
352	}	873	}
353		874
		875	/*****************************************************************************/
		876
354	void	877	void
355	evio_start (struct ev_io *w)	878	ev_io_start (struct ev_io *w)
356	{	879	{
		880	int fd = w->fd;
		881
357	if (ev_is_active (w))	882	if (ev_is_active (w))
358	return;	883	return;
359		884
360	int fd = w->fd;	885	assert (("ev_io_start called with negative fd", fd >= 0));
361		886
362	ev_start ((struct ev_watcher *)w, 1);	887	ev_start ((W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	888	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	889	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		890
366	++fdchangecnt;	891	fd_change (fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	892	}
370		893
371	void	894	void
372	evio_stop (struct ev_io *w)	895	ev_io_stop (struct ev_io *w)
373	{	896	{
		897	ev_clear_pending ((W)w);
374	if (!ev_is_active (w))	898	if (!ev_is_active (w))
375	return;	899	return;
376		900
377	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	901	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	902	ev_stop ((W)w);
379		903
380	++fdchangecnt;	904	fd_change (w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	905	}
384		906
385	void	907	void
386	evtimer_start (struct ev_timer *w)	908	ev_timer_start (struct ev_timer *w)
387	{	909	{
388	if (ev_is_active (w))	910	if (ev_is_active (w))
389	return;	911	return;
390		912
391	if (w->is_abs)
392	{
393	/* this formula differs from the one in timer_reify becuse we do not round up */
394	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
396	}
397	else
398	w->at += ev_now;	913	w->at += now;
399		914
400	ev_start ((struct ev_watcher *)w, ++timercnt);	915	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		916
		917	ev_start ((W)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );	918	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;	919	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);	920	upheap ((WT *)timers, timercnt - 1);
404	}	921	}
405		922
406	void	923	void
407	evtimer_stop (struct ev_timer *w)	924	ev_timer_stop (struct ev_timer *w)
408	{	925	{
		926	ev_clear_pending ((W)w);
409	if (!ev_is_active (w))	927	if (!ev_is_active (w))
410	return;	928	return;
411		929
412	if (w->active < timercnt--)	930	if (w->active < timercnt--)
413	{	931	{
414	timers [w->active - 1] = timers [timercnt];	932	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);	933	downheap ((WT *)timers, timercnt, w->active - 1);
416	}	934	}
417		935
418	ev_stop ((struct ev_watcher *)w);	936	w->at = w->repeat;
419	}
420		937
		938	ev_stop ((W)w);
		939	}
		940
421	void	941	void
422	evsignal_start (struct ev_signal *w)	942	ev_timer_again (struct ev_timer *w)
423	{	943	{
424	if (ev_is_active (w))	944	if (ev_is_active (w))
425	return;	945	{
		946	if (w->repeat)
		947	{
		948	w->at = now + w->repeat;
		949	downheap ((WT *)timers, timercnt, w->active - 1);
		950	}
		951	else
		952	ev_timer_stop (w);
		953	}
		954	else if (w->repeat)
		955	ev_timer_start (w);
		956	}
426		957
427	ev_start ((struct ev_watcher *)w, 1);	958	void
		959	ev_periodic_start (struct ev_periodic *w)
		960	{
		961	if (ev_is_active (w))
		962	return;
		963
		964	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		965
		966	/* this formula differs from the one in periodic_reify because we do not always round up */
		967	if (w->interval)
		968	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		969
		970	ev_start ((W)w, ++periodiccnt);
		971	array_needsize (periodics, periodicmax, periodiccnt, );
		972	periodics [periodiccnt - 1] = w;
		973	upheap ((WT *)periodics, periodiccnt - 1);
		974	}
		975
		976	void
		977	ev_periodic_stop (struct ev_periodic *w)
		978	{
		979	ev_clear_pending ((W)w);
		980	if (!ev_is_active (w))
		981	return;
		982
		983	if (w->active < periodiccnt--)
		984	{
		985	periodics [w->active - 1] = periodics [periodiccnt];
		986	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		987	}
		988
		989	ev_stop ((W)w);
		990	}
		991
		992	void
		993	ev_signal_start (struct ev_signal *w)
		994	{
		995	if (ev_is_active (w))
		996	return;
		997
		998	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		999
		1000	ev_start ((W)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);	1001	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	1002	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
430	}
431		1003
		1004	if (!w->next)
		1005	{
		1006	struct sigaction sa;
		1007	sa.sa_handler = sighandler;
		1008	sigfillset (&sa.sa_mask);
		1009	sa.sa_flags = 0;
		1010	sigaction (w->signum, &sa, 0);
		1011	}
		1012	}
		1013
432	void	1014	void
433	evsignal_stop (struct ev_signal *w)	1015	ev_signal_stop (struct ev_signal *w)
434	{	1016	{
		1017	ev_clear_pending ((W)w);
435	if (!ev_is_active (w))	1018	if (!ev_is_active (w))
436	return;	1019	return;
437		1020
438	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	1021	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1022	ev_stop ((W)w);
		1023
		1024	if (!signals [w->signum - 1].head)
		1025	signal (w->signum, SIG_DFL);
		1026	}
		1027
		1028	void
		1029	ev_idle_start (struct ev_idle *w)
		1030	{
		1031	if (ev_is_active (w))
		1032	return;
		1033
		1034	ev_start ((W)w, ++idlecnt);
		1035	array_needsize (idles, idlemax, idlecnt, );
		1036	idles [idlecnt - 1] = w;
		1037	}
		1038
		1039	void
		1040	ev_idle_stop (struct ev_idle *w)
		1041	{
		1042	ev_clear_pending ((W)w);
		1043	if (ev_is_active (w))
		1044	return;
		1045
		1046	idles [w->active - 1] = idles [--idlecnt];
		1047	ev_stop ((W)w);
		1048	}
		1049
		1050	void
		1051	ev_prepare_start (struct ev_prepare *w)
		1052	{
		1053	if (ev_is_active (w))
		1054	return;
		1055
		1056	ev_start ((W)w, ++preparecnt);
		1057	array_needsize (prepares, preparemax, preparecnt, );
		1058	prepares [preparecnt - 1] = w;
		1059	}
		1060
		1061	void
		1062	ev_prepare_stop (struct ev_prepare *w)
		1063	{
		1064	ev_clear_pending ((W)w);
		1065	if (ev_is_active (w))
		1066	return;
		1067
		1068	prepares [w->active - 1] = prepares [--preparecnt];
		1069	ev_stop ((W)w);
		1070	}
		1071
		1072	void
		1073	ev_check_start (struct ev_check *w)
		1074	{
		1075	if (ev_is_active (w))
		1076	return;
		1077
		1078	ev_start ((W)w, ++checkcnt);
		1079	array_needsize (checks, checkmax, checkcnt, );
		1080	checks [checkcnt - 1] = w;
		1081	}
		1082
		1083	void
439	ev_stop ((struct ev_watcher *)w);	1084	ev_check_stop (struct ev_check *w)
440	}	1085	{
		1086	ev_clear_pending ((W)w);
		1087	if (ev_is_active (w))
		1088	return;
441		1089
		1090	checks [w->active - 1] = checks [--checkcnt];
		1091	ev_stop ((W)w);
		1092	}
		1093
		1094	void
		1095	ev_child_start (struct ev_child *w)
		1096	{
		1097	if (ev_is_active (w))
		1098	return;
		1099
		1100	ev_start ((W)w, 1);
		1101	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1102	}
		1103
		1104	void
		1105	ev_child_stop (struct ev_child *w)
		1106	{
		1107	ev_clear_pending ((W)w);
		1108	if (ev_is_active (w))
		1109	return;
		1110
		1111	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1112	ev_stop ((W)w);
		1113	}
		1114
442	/*****************************************************************************/	1115	/*****************************************************************************/
		1116
		1117	struct ev_once
		1118	{
		1119	struct ev_io io;
		1120	struct ev_timer to;
		1121	void (cb)(int revents, void arg);
		1122	void *arg;
		1123	};
		1124
		1125	static void
		1126	once_cb (struct ev_once *once, int revents)
		1127	{
		1128	void (cb)(int revents, void arg) = once->cb;
		1129	void *arg = once->arg;
		1130
		1131	ev_io_stop (&once->io);
		1132	ev_timer_stop (&once->to);
		1133	free (once);
		1134
		1135	cb (revents, arg);
		1136	}
		1137
		1138	static void
		1139	once_cb_io (struct ev_io *w, int revents)
		1140	{
		1141	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1142	}
		1143
		1144	static void
		1145	once_cb_to (struct ev_timer *w, int revents)
		1146	{
		1147	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1148	}
		1149
		1150	void
		1151	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1152	{
		1153	struct ev_once *once = malloc (sizeof (struct ev_once));
		1154
		1155	if (!once)
		1156	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1157	else
		1158	{
		1159	once->cb = cb;
		1160	once->arg = arg;
		1161
		1162	ev_watcher_init (&once->io, once_cb_io);
		1163	if (fd >= 0)
		1164	{
		1165	ev_io_set (&once->io, fd, events);
		1166	ev_io_start (&once->io);
		1167	}
		1168
		1169	ev_watcher_init (&once->to, once_cb_to);
		1170	if (timeout >= 0.)
		1171	{
		1172	ev_timer_set (&once->to, timeout, 0.);
		1173	ev_timer_start (&once->to);
		1174	}
		1175	}
		1176	}
		1177
		1178	/*****************************************************************************/
		1179
443	#if 1	1180	#if 0
		1181
		1182	struct ev_io wio;
444		1183
445	static void	1184	static void
446	sin_cb (struct ev_io *w, int revents)	1185	sin_cb (struct ev_io *w, int revents)
447	{	1186	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1187	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}	1188	}
450		1189
451	static void	1190	static void
452	ocb (struct ev_timer *w, int revents)	1191	ocb (struct ev_timer *w, int revents)
453	{	1192	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1193	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1194	ev_timer_stop (w);
		1195	ev_timer_start (w);
		1196	}
		1197
		1198	static void
		1199	scb (struct ev_signal *w, int revents)
		1200	{
		1201	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1202	ev_io_stop (&wio);
		1203	ev_io_start (&wio);
		1204	}
		1205
		1206	static void
		1207	gcb (struct ev_signal *w, int revents)
		1208	{
		1209	fprintf (stderr, "generic %x\n", revents);
		1210
455	}	1211	}
456		1212
457	int main (void)	1213	int main (void)
458	{	1214	{
459	struct ev_io sin;
460
461	ev_init (0);	1215	ev_init (0);
462		1216
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);	1217	ev_io_init (&wio, sin_cb, 0, EV_READ);
465	evio_start (&sin);	1218	ev_io_start (&wio);
466		1219
467	struct ev_timer t[1000];	1220	struct ev_timer t[10000];
468		1221
		1222	#if 0
469	int i;	1223	int i;
470	for (i = 0; i < 1000; ++i)	1224	for (i = 0; i < 10000; ++i)
471	{	1225	{
472	struct ev_timer *w = t + i;	1226	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);	1227	ev_watcher_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);	1228	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
475	evtimer_start (w);	1229	ev_timer_start (w);
476	if (drand48 () < 0.5)	1230	if (drand48 () < 0.5)
477	evtimer_stop (w);	1231	ev_timer_stop (w);
478	}	1232	}
		1233	#endif
		1234
		1235	struct ev_timer t1;
		1236	ev_timer_init (&t1, ocb, 5, 10);
		1237	ev_timer_start (&t1);
		1238
		1239	struct ev_signal sig;
		1240	ev_signal_init (&sig, scb, SIGQUIT);
		1241	ev_signal_start (&sig);
		1242
		1243	struct ev_check cw;
		1244	ev_check_init (&cw, gcb);
		1245	ev_check_start (&cw);
		1246
		1247	struct ev_idle iw;
		1248	ev_idle_init (&iw, gcb);
		1249	ev_idle_start (&iw);
479		1250
480	ev_loop (0);	1251	ev_loop (0);
481		1252
482	return 0;	1253	return 0;
483	}	1254	}

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Comparing libev/ev.c (file contents): Revision 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs. Revision 1.43 by root, Fri Nov 2 20:21:33 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs.
Revision 1.43 by root, Fri Nov 2 20:21:33 2007 UTC