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

Comparing libev/ev.c (file contents):
Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.36 by root, Thu Nov 1 13:11:11 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
6	#include <assert.h>	44	#include <assert.h>
7	#include <errno.h>	45	#include <errno.h>
		46	#include <sys/types.h>
		47	#include <sys/wait.h>
8	#include <sys/time.h>	48	#include <sys/time.h>
9	#include <time.h>	49	#include <time.h>
10		50
		51	#ifndef EV_USE_MONOTONIC
11	#ifdef CLOCK_MONOTONIC	52	# ifdef CLOCK_MONOTONIC
12	# define HAVE_MONOTONIC 1	53	# define EV_USE_MONOTONIC 1
13	#endif	54	# endif
		55	#endif
14		56
		57	#ifndef EV_USE_SELECT
		58	# define EV_USE_SELECT 1
		59	#endif
		60
		61	#ifndef EV_USE_EPOLL
15	#define HAVE_EPOLL 1	62	# define EV_USE_EPOLL 0
		63	#endif
		64
		65	#ifndef CLOCK_REALTIME
16	#define HAVE_REALTIME 1	66	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 0	67	#endif
		68	#ifndef EV_USE_REALTIME
		69	# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */
		70	#endif
18		71
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	72	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	73	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detetc time jumps) */
		74	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		75	#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
21		76
22	#include "ev.h"	77	#include "ev.h"
23		78
24	struct ev_watcher {	79	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	80	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	81	typedef struct ev_watcher_time *WT;
30	};
31		82
32	static ev_tstamp now, diff; /* monotonic clock */	83	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	84	ev_tstamp ev_now;
34	int ev_method;	85	int ev_method;
35		86
36	static int have_monotonic; /* runtime */	87	static int have_monotonic; /* runtime */
37		88
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	89	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
39	static void (*method_reify)(void);	90	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);	91	static void (*method_poll)(ev_tstamp timeout);
		92
		93	/*****************************************************************************/
41		94
42	ev_tstamp	95	ev_tstamp
43	ev_time (void)	96	ev_time (void)
44	{	97	{
45	#if HAVE_REALTIME	98	#if EV_USE_REALTIME
46	struct timespec ts;	99	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	100	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	101	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	102	#else
50	struct timeval tv;	103	struct timeval tv;
54	}	107	}
55		108
56	static ev_tstamp	109	static ev_tstamp
57	get_clock (void)	110	get_clock (void)
58	{	111	{
59	#if HAVE_MONOTONIC	112	#if EV_USE_MONOTONIC
60	if (have_monotonic)	113	if (have_monotonic)
61	{	114	{
62	struct timespec ts;	115	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	116	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	117	return ts.tv_sec + ts.tv_nsec * 1e-9;
…		…
66	#endif	119	#endif
67		120
68	return ev_time ();	121	return ev_time ();
69	}	122	}
70		123
		124	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		125
71	#define array_needsize(base,cur,cnt,init) \	126	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	127	if ((cnt) > cur) \
73	{ \	128	{ \
74	int newcnt = cur ? cur << 1 : 16; \	129	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	130	do \
		131	{ \
		132	newcnt = array_roundsize (base, newcnt << 1); \
		133	} \
		134	while ((cnt) > newcnt); \
		135	\
76	base = realloc (base, sizeof (base) (newcnt)); \	136	base = realloc (base, sizeof (base) (newcnt)); \
77	init (base + cur, newcnt - cur); \	137	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	138	cur = newcnt; \
79	}	139	}
80		140
		141	/*****************************************************************************/
		142
81	typedef struct	143	typedef struct
82	{	144	{
83	struct ev_io *head;	145	struct ev_io *head;
84	unsigned char wev, rev; /* want, received event set */	146	unsigned char events;
		147	unsigned char reify;
85	} ANFD;	148	} ANFD;
86		149
87	static ANFD *anfds;	150	static ANFD *anfds;
88	static int anfdmax;	151	static int anfdmax;
89		152
90	static int *fdchanges;
91	static int fdchangemax, fdchangecnt;
92
93	static void	153	static void
94	anfds_init (ANFD *base, int count)	154	anfds_init (ANFD *base, int count)
95	{	155	{
96	while (count--)	156	while (count--)
97	{	157	{
98	base->head = 0;	158	base->head = 0;
99	base->wev = base->rev = EV_NONE;	159	base->events = EV_NONE;
		160	base->reify = 0;
		161
100	++base;	162	++base;
101	}	163	}
102	}	164	}
103		165
104	typedef struct	166	typedef struct
105	{	167	{
106	struct ev_watcher *w;	168	W w;
107	int events;	169	int events;
108	} ANPENDING;	170	} ANPENDING;
109		171
110	static ANPENDING *pendings;	172	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;	173	static int pendingmax, pendingcnt;
112		174
113	static void	175	static void
114	event (struct ev_watcher *w, int events)	176	event (W w, int events)
115	{	177	{
		178	if (w->pending)
		179	{
		180	pendings [w->pending - 1].events \|= events;
		181	return;
		182	}
		183
116	w->pending = ++pendingcnt;	184	w->pending = ++pendingcnt;
117	array_needsize (pendings, pendingmax, pendingcnt, );	185	array_needsize (pendings, pendingmax, pendingcnt, );
118	pendings [pendingcnt - 1].w = w;	186	pendings [pendingcnt - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	187	pendings [pendingcnt - 1].events = events;
120	}	188	}
121		189
122	static void	190	static void
		191	queue_events (W *events, int eventcnt, int type)
		192	{
		193	int i;
		194
		195	for (i = 0; i < eventcnt; ++i)
		196	event (events [i], type);
		197	}
		198
		199	static void
123	fd_event (int fd, int events)	200	fd_event (int fd, int events)
124	{	201	{
125	ANFD *anfd = anfds + fd;	202	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	203	struct ev_io *w;
127		204
128	for (w = anfd->head; w; w = w->next)	205	for (w = anfd->head; w; w = w->next)
129	{	206	{
130	int ev = w->events & events;	207	int ev = w->events & events;
131		208
132	if (ev)	209	if (ev)
133	event ((struct ev_watcher *)w, ev);	210	event ((W)w, ev);
		211	}
		212	}
		213
		214	/*****************************************************************************/
		215
		216	static int *fdchanges;
		217	static int fdchangemax, fdchangecnt;
		218
		219	static void
		220	fd_reify (void)
		221	{
		222	int i;
		223
		224	for (i = 0; i < fdchangecnt; ++i)
134	}	225	{
135	}	226	int fd = fdchanges [i];
		227	ANFD *anfd = anfds + fd;
		228	struct ev_io *w;
136		229
		230	int events = 0;
		231
		232	for (w = anfd->head; w; w = w->next)
		233	events \|= w->events;
		234
		235	anfd->reify = 0;
		236
		237	if (anfd->events != events)
		238	{
		239	method_modify (fd, anfd->events, events);
		240	anfd->events = events;
		241	}
		242	}
		243
		244	fdchangecnt = 0;
		245	}
		246
		247	static void
		248	fd_change (int fd)
		249	{
		250	if (anfds [fd].reify \|\| fdchangecnt < 0)
		251	return;
		252
		253	anfds [fd].reify = 1;
		254
		255	++fdchangecnt;
		256	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		257	fdchanges [fdchangecnt - 1] = fd;
		258	}
		259
		260	/* called on EBADF to verify fds */
		261	static void
		262	fd_recheck (void)
		263	{
		264	int fd;
		265
		266	for (fd = 0; fd < anfdmax; ++fd)
		267	if (anfds [fd].events)
		268	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		269	while (anfds [fd].head)
		270	{
		271	ev_io_stop (anfds [fd].head);
		272	event ((W)anfds [fd].head, EV_ERROR \| EV_READ \| EV_WRITE);
		273	}
		274	}
		275
		276	/*****************************************************************************/
		277
137	static struct ev_timer **atimers;	278	static struct ev_timer **timers;
138	static int atimermax, atimercnt;	279	static int timermax, timercnt;
139		280
140	static struct ev_timer **rtimers;	281	static struct ev_periodic **periodics;
141	static int rtimermax, rtimercnt;	282	static int periodicmax, periodiccnt;
142		283
143	static void	284	static void
144	upheap (struct ev_timer **timers, int k)	285	upheap (WT *timers, int k)
145	{	286	{
146	struct ev_timer *w = timers [k];	287	WT w = timers [k];
147		288
148	while (k && timers [k >> 1]->at > w->at)	289	while (k && timers [k >> 1]->at > w->at)
149	{	290	{
150	timers [k] = timers [k >> 1];	291	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;	292	timers [k]->active = k + 1;
…		…
156	timers [k]->active = k + 1;	297	timers [k]->active = k + 1;
157		298
158	}	299	}
159		300
160	static void	301	static void
161	downheap (struct ev_timer **timers, int N, int k)	302	downheap (WT *timers, int N, int k)
162	{	303	{
163	struct ev_timer *w = timers [k];	304	WT w = timers [k];
164		305
165	while (k < (N >> 1))	306	while (k < (N >> 1))
166	{	307	{
167	int j = k << 1;	308	int j = k << 1;
168		309
…		…
179		320
180	timers [k] = w;	321	timers [k] = w;
181	timers [k]->active = k + 1;	322	timers [k]->active = k + 1;
182	}	323	}
183		324
184	static struct ev_signal **signals;	325	/*****************************************************************************/
		326
		327	typedef struct
		328	{
		329	struct ev_signal *head;
		330	sig_atomic_t volatile gotsig;
		331	} ANSIG;
		332
		333	static ANSIG *signals;
185	static int signalmax;	334	static int signalmax;
186		335
		336	static int sigpipe [2];
		337	static sig_atomic_t volatile gotsig;
		338	static struct ev_io sigev;
		339
187	static void	340	static void
188	signals_init (struct ev_signal **base, int count)	341	signals_init (ANSIG *base, int count)
189	{	342	{
190	while (count--)	343	while (count--)
191	*base++ = 0;	344	{
192	}	345	base->head = 0;
		346	base->gotsig = 0;
193		347
		348	++base;
		349	}
		350	}
		351
		352	static void
		353	sighandler (int signum)
		354	{
		355	signals [signum - 1].gotsig = 1;
		356
		357	if (!gotsig)
		358	{
		359	gotsig = 1;
		360	write (sigpipe [1], &signum, 1);
		361	}
		362	}
		363
		364	static void
		365	sigcb (struct ev_io *iow, int revents)
		366	{
		367	struct ev_signal *w;
		368	int sig;
		369
		370	read (sigpipe [0], &revents, 1);
		371	gotsig = 0;
		372
		373	for (sig = signalmax; sig--; )
		374	if (signals [sig].gotsig)
		375	{
		376	signals [sig].gotsig = 0;
		377
		378	for (w = signals [sig].head; w; w = w->next)
		379	event ((W)w, EV_SIGNAL);
		380	}
		381	}
		382
		383	static void
		384	siginit (void)
		385	{
		386	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		387	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		388
		389	/* rather than sort out wether we really need nb, set it */
		390	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		391	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		392
		393	ev_io_set (&sigev, sigpipe [0], EV_READ);
		394	ev_io_start (&sigev);
		395	}
		396
		397	/*****************************************************************************/
		398
		399	static struct ev_idle **idles;
		400	static int idlemax, idlecnt;
		401
		402	static struct ev_prepare **prepares;
		403	static int preparemax, preparecnt;
		404
		405	static struct ev_check **checks;
		406	static int checkmax, checkcnt;
		407
		408	/*****************************************************************************/
		409
		410	static struct ev_child *childs [PID_HASHSIZE];
		411	static struct ev_signal childev;
		412
		413	#ifndef WCONTINUED
		414	# define WCONTINUED 0
		415	#endif
		416
		417	static void
		418	childcb (struct ev_signal *sw, int revents)
		419	{
		420	struct ev_child *w;
		421	int pid, status;
		422
		423	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		424	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		425	if (w->pid == pid \|\| w->pid == -1)
		426	{
		427	w->status = status;
		428	event ((W)w, EV_CHILD);
		429	}
		430	}
		431
		432	/*****************************************************************************/
		433
194	#if HAVE_EPOLL	434	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	435	# include "ev_epoll.c"
196	#endif	436	#endif
197	#if HAVE_SELECT	437	#if EV_USE_SELECT
198	# include "ev_select.c"	438	# include "ev_select.c"
199	#endif	439	#endif
200		440
		441	int
		442	ev_version_major (void)
		443	{
		444	return EV_VERSION_MAJOR;
		445	}
		446
		447	int
		448	ev_version_minor (void)
		449	{
		450	return EV_VERSION_MINOR;
		451	}
		452
201	int ev_init (int flags)	453	int ev_init (int flags)
202	{	454	{
		455	if (!ev_method)
		456	{
203	#if HAVE_MONOTONIC	457	#if EV_USE_MONOTONIC
204	{	458	{
205	struct timespec ts;	459	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	460	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	461	have_monotonic = 1;
208	}	462	}
209	#endif	463	#endif
210		464
211	ev_now = ev_time ();	465	ev_now = ev_time ();
212	now = get_clock ();	466	now = get_clock ();
213	diff = ev_now - now;	467	diff = ev_now - now;
214		468
215	#if HAVE_EPOLL	469	if (pipe (sigpipe))
216	if (epoll_init (flags))	470	return 0;
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223		471
224	ev_method = EVMETHOD_NONE;	472	ev_method = EVMETHOD_NONE;
		473	#if EV_USE_EPOLL
		474	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
		475	#endif
		476	#if EV_USE_SELECT
		477	if (ev_method == EVMETHOD_NONE) select_init (flags);
		478	#endif
		479
		480	if (ev_method)
		481	{
		482	ev_watcher_init (&sigev, sigcb);
		483	siginit ();
		484
		485	ev_signal_init (&childev, childcb, SIGCHLD);
		486	ev_signal_start (&childev);
		487	}
		488	}
		489
225	return ev_method;	490	return ev_method;
226	}	491	}
227		492
228	void ev_prefork (void)	493	/*****************************************************************************/
229	{
230	}
231		494
		495	void
		496	ev_fork_prepare (void)
		497	{
		498	/* nop */
		499	}
		500
		501	void
232	void ev_postfork_parent (void)	502	ev_fork_parent (void)
233	{	503	{
		504	/* nop */
234	}	505	}
235		506
		507	void
236	void ev_postfork_child (void)	508	ev_fork_child (void)
237	{	509	{
238	#if HAVE_EPOLL	510	#if EV_USE_EPOLL
		511	if (ev_method == EVMETHOD_EPOLL)
239	epoll_postfork_child ();	512	epoll_postfork_child ();
240	#endif	513	#endif
241	}
242		514
		515	ev_io_stop (&sigev);
		516	close (sigpipe [0]);
		517	close (sigpipe [1]);
		518	pipe (sigpipe);
		519	siginit ();
		520	}
		521
		522	/*****************************************************************************/
		523
243	static void	524	static void
244	call_pending ()	525	call_pending (void)
245	{	526	{
246	int i;	527	while (pendingcnt)
247
248	for (i = 0; i < pendingcnt; ++i)
249	{	528	{
250	ANPENDING *p = pendings + i;	529	ANPENDING *p = pendings + --pendingcnt;
251		530
252	if (p->w)	531	if (p->w)
253	{	532	{
254	p->w->pending = 0;	533	p->w->pending = 0;
255	p->w->cb (p->w, p->events);	534	p->w->cb (p->w, p->events);
256	}	535	}
257	}	536	}
258
259	pendingcnt = 0;
260	}	537	}
261		538
262	static void	539	static void
263	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	540	timers_reify (void)
264	{	541	{
265	while (timercnt && timers [0]->at <= now)	542	while (timercnt && timers [0]->at <= now)
266	{	543	{
267	struct ev_timer *w = timers [0];	544	struct ev_timer *w = timers [0];
268		545
269	/* first reschedule or stop timer */	546	/* first reschedule or stop timer */
270	if (w->repeat)	547	if (w->repeat)
271	{	548	{
272	if (w->is_abs)	549	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
273	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
274	else
275	w->at = now + w->repeat;	550	w->at = now + w->repeat;
276
277	assert (w->at > now);
278
279	downheap (timers, timercnt, 0);	551	downheap ((WT *)timers, timercnt, 0);
280	}	552	}
281	else	553	else
282	{
283	evtimer_stop (w); /* nonrepeating: stop timer */	554	ev_timer_stop (w); /* nonrepeating: stop timer */
284	--timercnt; /* maybe pass by reference instead? */	555
		556	event ((W)w, EV_TIMEOUT);
		557	}
		558	}
		559
		560	static void
		561	periodics_reify (void)
		562	{
		563	while (periodiccnt && periodics [0]->at <= ev_now)
		564	{
		565	struct ev_periodic *w = periodics [0];
		566
		567	/* first reschedule or stop timer */
		568	if (w->interval)
285	}	569	{
		570	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		571	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
		572	downheap ((WT *)periodics, periodiccnt, 0);
		573	}
		574	else
		575	ev_periodic_stop (w); /* nonrepeating: stop timer */
286		576
287	event ((struct ev_watcher *)w, EV_TIMEOUT);	577	event ((W)w, EV_PERIODIC);
288	}	578	}
289	}	579	}
290		580
291	static void	581	static void
292	time_update ()	582	periodics_reschedule (ev_tstamp diff)
293	{	583	{
294	int i;	584	int i;
		585
		586	/* adjust periodics after time jump */
		587	for (i = 0; i < periodiccnt; ++i)
		588	{
		589	struct ev_periodic *w = periodics [i];
		590
		591	if (w->interval)
		592	{
		593	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		594
		595	if (fabs (diff) >= 1e-4)
		596	{
		597	ev_periodic_stop (w);
		598	ev_periodic_start (w);
		599
		600	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		601	}
		602	}
		603	}
		604	}
		605
		606	static void
		607	time_update (void)
		608	{
		609	int i;
		610
295	ev_now = ev_time ();	611	ev_now = ev_time ();
296		612
297	if (have_monotonic)	613	if (have_monotonic)
298	{	614	{
299	ev_tstamp odiff = diff;	615	ev_tstamp odiff = diff;
300		616
301	/* detecting time jumps is much more difficult */
302	for (i = 2; --i; ) /* loop a few times, before making important decisions */	617	for (i = 4; --i; ) /* loop a few times, before making important decisions */
303	{	618	{
304	now = get_clock ();	619	now = get_clock ();
305	diff = ev_now - now;	620	diff = ev_now - now;
306		621
307	if (fabs (odiff - diff) < MIN_TIMEJUMP)	622	if (fabs (odiff - diff) < MIN_TIMEJUMP)
308	return; /* all is well */	623	return; /* all is well */
309		624
310	ev_now = ev_time ();	625	ev_now = ev_time ();
311	}	626	}
312		627
313	/* time jump detected, reschedule atimers */	628	periodics_reschedule (diff - odiff);
314	for (i = 0; i < atimercnt; ++i)	629	/* no timer adjustment, as the monotonic clock doesn't jump */
315	{
316	struct ev_timer *w = atimers [i];
317	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
318	}
319	}	630	}
320	else	631	else
321	{	632	{
322	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	633	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
323	/* time jump detected, adjust rtimers */	634	{
		635	periodics_reschedule (ev_now - now);
		636
		637	/* adjust timers. this is easy, as the offset is the same for all */
324	for (i = 0; i < rtimercnt; ++i)	638	for (i = 0; i < timercnt; ++i)
325	rtimers [i]->at += ev_now - now;	639	timers [i]->at += diff;
		640	}
326		641
327	now = ev_now;	642	now = ev_now;
328	}	643	}
329	}	644	}
330		645
331	int ev_loop_done;	646	int ev_loop_done;
332		647
333	void ev_loop (int flags)	648	void ev_loop (int flags)
334	{	649	{
335	double block;	650	double block;
336	ev_loop_done = flags & EVLOOP_ONESHOT;	651	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
337		652
338	do	653	do
339	{	654	{
		655	/* queue check watchers (and execute them) */
		656	if (preparecnt)
		657	{
		658	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		659	call_pending ();
		660	}
		661
340	/* update fd-related kernel structures */	662	/* update fd-related kernel structures */
341	method_reify (); fdchangecnt = 0;	663	fd_reify ();
342		664
343	/* calculate blocking time */	665	/* calculate blocking time */
		666
		667	/* we only need this for !monotonic clockor timers, but as we basically
		668	always have timers, we just calculate it always */
		669	ev_now = ev_time ();
		670
344	if (flags & EVLOOP_NONBLOCK)	671	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
345	block = 0.;	672	block = 0.;
346	else	673	else
347	{	674	{
348	block = MAX_BLOCKTIME;	675	block = MAX_BLOCKTIME;
349		676
350	if (rtimercnt)	677	if (timercnt)
351	{	678	{
352	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	679	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
353	if (block > to) block = to;	680	if (block > to) block = to;
354	}	681	}
355		682
356	if (atimercnt)	683	if (periodiccnt)
357	{	684	{
358	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	685	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
359	if (block > to) block = to;	686	if (block > to) block = to;
360	}	687	}
361		688
362	if (block < 0.) block = 0.;	689	if (block < 0.) block = 0.;
363	}	690	}
…		…
365	method_poll (block);	692	method_poll (block);
366		693
367	/* update ev_now, do magic */	694	/* update ev_now, do magic */
368	time_update ();	695	time_update ();
369		696
370	/* put pending timers into pendign queue and reschedule them */	697	/* queue pending timers and reschedule them */
371	/* absolute timers first */	698	timers_reify (); /* relative timers called last */
372	timers_reify (atimers, atimercnt, ev_now);	699	periodics_reify (); /* absolute timers called first */
373	/* relative timers second */	700
374	timers_reify (rtimers, rtimercnt, now);	701	/* queue idle watchers unless io or timers are pending */
		702	if (!pendingcnt)
		703	queue_events ((W *)idles, idlecnt, EV_IDLE);
		704
		705	/* queue check watchers, to be executed first */
		706	if (checkcnt)
		707	queue_events ((W *)checks, checkcnt, EV_CHECK);
375		708
376	call_pending ();	709	call_pending ();
377	}	710	}
378	while (!ev_loop_done);	711	while (!ev_loop_done);
379	}
380		712
		713	if (ev_loop_done != 2)
		714	ev_loop_done = 0;
		715	}
		716
		717	/*****************************************************************************/
		718
381	static void	719	static void
382	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	720	wlist_add (WL *head, WL elem)
383	{	721	{
384	elem->next = *head;	722	elem->next = *head;
385	*head = elem;	723	*head = elem;
386	}	724	}
387		725
388	static void	726	static void
389	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	727	wlist_del (WL *head, WL elem)
390	{	728	{
391	while (*head)	729	while (*head)
392	{	730	{
393	if (*head == elem)	731	if (*head == elem)
394	{	732	{
…		…
399	head = &(*head)->next;	737	head = &(*head)->next;
400	}	738	}
401	}	739	}
402		740
403	static void	741	static void
404	ev_start (struct ev_watcher *w, int active)	742	ev_clear_pending (W w)
405	{	743	{
		744	if (w->pending)
		745	{
		746	pendings [w->pending - 1].w = 0;
406	w->pending = 0;	747	w->pending = 0;
		748	}
		749	}
		750
		751	static void
		752	ev_start (W w, int active)
		753	{
407	w->active = active;	754	w->active = active;
408	}	755	}
409		756
410	static void	757	static void
411	ev_stop (struct ev_watcher *w)	758	ev_stop (W w)
412	{	759	{
413	if (w->pending)
414	pendings [w->pending - 1].w = 0;
415
416	w->active = 0;	760	w->active = 0;
417	/* nop */
418	}	761	}
419		762
		763	/*****************************************************************************/
		764
420	void	765	void
421	evio_start (struct ev_io *w)	766	ev_io_start (struct ev_io *w)
422	{	767	{
423	if (ev_is_active (w))	768	if (ev_is_active (w))
424	return;	769	return;
425		770
426	int fd = w->fd;	771	int fd = w->fd;
427		772
428	ev_start ((struct ev_watcher *)w, 1);	773	assert (("ev_io_start called with negative fd", fd >= 0));
		774
		775	ev_start ((W)w, 1);
429	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	776	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
430	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	777	wlist_add ((WL *)&anfds[fd].head, (WL)w);
431		778
432	++fdchangecnt;	779	fd_change (fd);
433	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
434	fdchanges [fdchangecnt - 1] = fd;
435	}	780	}
436		781
437	void	782	void
438	evio_stop (struct ev_io *w)	783	ev_io_stop (struct ev_io *w)
439	{	784	{
		785	ev_clear_pending ((W)w);
440	if (!ev_is_active (w))	786	if (!ev_is_active (w))
441	return;	787	return;
442		788
443	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	789	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
444	ev_stop ((struct ev_watcher *)w);	790	ev_stop ((W)w);
445		791
446	++fdchangecnt;	792	fd_change (w->fd);
447	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
448	fdchanges [fdchangecnt - 1] = w->fd;
449	}	793	}
450		794
451	void	795	void
452	evtimer_start (struct ev_timer *w)	796	ev_timer_start (struct ev_timer *w)
453	{	797	{
		798	if (ev_is_active (w))
		799	return;
		800
		801	w->at += now;
		802
		803	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		804
		805	ev_start ((W)w, ++timercnt);
		806	array_needsize (timers, timermax, timercnt, );
		807	timers [timercnt - 1] = w;
		808	upheap ((WT *)timers, timercnt - 1);
		809	}
		810
		811	void
		812	ev_timer_stop (struct ev_timer *w)
		813	{
		814	ev_clear_pending ((W)w);
454	if (ev_is_active (w))	815	if (!ev_is_active (w))
455	return;	816	return;
456		817
457	if (w->is_abs)	818	if (w->active < timercnt--)
		819	{
		820	timers [w->active - 1] = timers [timercnt];
		821	downheap ((WT *)timers, timercnt, w->active - 1);
458	{	822	}
459	/* this formula differs from the one in timer_reify becuse we do not round up */	823
		824	w->at = w->repeat;
		825
		826	ev_stop ((W)w);
		827	}
		828
		829	void
		830	ev_timer_again (struct ev_timer *w)
		831	{
		832	if (ev_is_active (w))
		833	{
460	if (w->repeat)	834	if (w->repeat)
		835	{
		836	w->at = now + w->repeat;
		837	downheap ((WT *)timers, timercnt, w->active - 1);
		838	}
		839	else
		840	ev_timer_stop (w);
		841	}
		842	else if (w->repeat)
		843	ev_timer_start (w);
		844	}
		845
		846	void
		847	ev_periodic_start (struct ev_periodic *w)
		848	{
		849	if (ev_is_active (w))
		850	return;
		851
		852	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		853
		854	/* this formula differs from the one in periodic_reify because we do not always round up */
		855	if (w->interval)
461	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	856	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
462		857
463	ev_start ((struct ev_watcher *)w, ++atimercnt);	858	ev_start ((W)w, ++periodiccnt);
464	array_needsize (atimers, atimermax, atimercnt, );	859	array_needsize (periodics, periodicmax, periodiccnt, );
465	atimers [atimercnt - 1] = w;	860	periodics [periodiccnt - 1] = w;
466	upheap (atimers, atimercnt - 1);	861	upheap ((WT *)periodics, periodiccnt - 1);
		862	}
		863
		864	void
		865	ev_periodic_stop (struct ev_periodic *w)
		866	{
		867	ev_clear_pending ((W)w);
		868	if (!ev_is_active (w))
		869	return;
		870
		871	if (w->active < periodiccnt--)
467	}	872	{
		873	periodics [w->active - 1] = periodics [periodiccnt];
		874	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		875	}
		876
		877	ev_stop ((W)w);
		878	}
		879
		880	void
		881	ev_signal_start (struct ev_signal *w)
		882	{
		883	if (ev_is_active (w))
		884	return;
		885
		886	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		887
		888	ev_start ((W)w, 1);
		889	array_needsize (signals, signalmax, w->signum, signals_init);
		890	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		891
		892	if (!w->next)
		893	{
		894	struct sigaction sa;
		895	sa.sa_handler = sighandler;
		896	sigfillset (&sa.sa_mask);
		897	sa.sa_flags = 0;
		898	sigaction (w->signum, &sa, 0);
		899	}
		900	}
		901
		902	void
		903	ev_signal_stop (struct ev_signal *w)
		904	{
		905	ev_clear_pending ((W)w);
		906	if (!ev_is_active (w))
		907	return;
		908
		909	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		910	ev_stop ((W)w);
		911
		912	if (!signals [w->signum - 1].head)
		913	signal (w->signum, SIG_DFL);
		914	}
		915
		916	void
		917	ev_idle_start (struct ev_idle *w)
		918	{
		919	if (ev_is_active (w))
		920	return;
		921
		922	ev_start ((W)w, ++idlecnt);
		923	array_needsize (idles, idlemax, idlecnt, );
		924	idles [idlecnt - 1] = w;
		925	}
		926
		927	void
		928	ev_idle_stop (struct ev_idle *w)
		929	{
		930	ev_clear_pending ((W)w);
		931	if (ev_is_active (w))
		932	return;
		933
		934	idles [w->active - 1] = idles [--idlecnt];
		935	ev_stop ((W)w);
		936	}
		937
		938	void
		939	ev_prepare_start (struct ev_prepare *w)
		940	{
		941	if (ev_is_active (w))
		942	return;
		943
		944	ev_start ((W)w, ++preparecnt);
		945	array_needsize (prepares, preparemax, preparecnt, );
		946	prepares [preparecnt - 1] = w;
		947	}
		948
		949	void
		950	ev_prepare_stop (struct ev_prepare *w)
		951	{
		952	ev_clear_pending ((W)w);
		953	if (ev_is_active (w))
		954	return;
		955
		956	prepares [w->active - 1] = prepares [--preparecnt];
		957	ev_stop ((W)w);
		958	}
		959
		960	void
		961	ev_check_start (struct ev_check *w)
		962	{
		963	if (ev_is_active (w))
		964	return;
		965
		966	ev_start ((W)w, ++checkcnt);
		967	array_needsize (checks, checkmax, checkcnt, );
		968	checks [checkcnt - 1] = w;
		969	}
		970
		971	void
		972	ev_check_stop (struct ev_check *w)
		973	{
		974	ev_clear_pending ((W)w);
		975	if (ev_is_active (w))
		976	return;
		977
		978	checks [w->active - 1] = checks [--checkcnt];
		979	ev_stop ((W)w);
		980	}
		981
		982	void
		983	ev_child_start (struct ev_child *w)
		984	{
		985	if (ev_is_active (w))
		986	return;
		987
		988	ev_start ((W)w, 1);
		989	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		990	}
		991
		992	void
		993	ev_child_stop (struct ev_child *w)
		994	{
		995	ev_clear_pending ((W)w);
		996	if (ev_is_active (w))
		997	return;
		998
		999	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1000	ev_stop ((W)w);
		1001	}
		1002
		1003	/*****************************************************************************/
		1004
		1005	struct ev_once
		1006	{
		1007	struct ev_io io;
		1008	struct ev_timer to;
		1009	void (cb)(int revents, void arg);
		1010	void *arg;
		1011	};
		1012
		1013	static void
		1014	once_cb (struct ev_once *once, int revents)
		1015	{
		1016	void (cb)(int revents, void arg) = once->cb;
		1017	void *arg = once->arg;
		1018
		1019	ev_io_stop (&once->io);
		1020	ev_timer_stop (&once->to);
		1021	free (once);
		1022
		1023	cb (revents, arg);
		1024	}
		1025
		1026	static void
		1027	once_cb_io (struct ev_io *w, int revents)
		1028	{
		1029	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1030	}
		1031
		1032	static void
		1033	once_cb_to (struct ev_timer *w, int revents)
		1034	{
		1035	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1036	}
		1037
		1038	void
		1039	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1040	{
		1041	struct ev_once *once = malloc (sizeof (struct ev_once));
		1042
		1043	if (!once)
		1044	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
468	else	1045	else
469	{	1046	{
470	w->at += now;	1047	once->cb = cb;
		1048	once->arg = arg;
471		1049
472	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1050	ev_watcher_init (&once->io, once_cb_io);
473	array_needsize (rtimers, rtimermax, rtimercnt, );	1051	if (fd >= 0)
474	rtimers [rtimercnt - 1] = w;
475	upheap (rtimers, rtimercnt - 1);
476	}
477
478	}
479
480	void
481	evtimer_stop (struct ev_timer *w)
482	{
483	if (!ev_is_active (w))
484	return;
485
486	if (w->is_abs)
487	{
488	if (w->active < atimercnt--)
489	{
490	atimers [w->active - 1] = atimers [atimercnt];
491	downheap (atimers, atimercnt, w->active - 1);
492	}	1052	{
493	}	1053	ev_io_set (&once->io, fd, events);
494	else	1054	ev_io_start (&once->io);
495	{
496	if (w->active < rtimercnt--)
497	{	1055	}
498	rtimers [w->active - 1] = rtimers [rtimercnt];	1056
499	downheap (rtimers, rtimercnt, w->active - 1);	1057	ev_watcher_init (&once->to, once_cb_to);
		1058	if (timeout >= 0.)
500	}	1059	{
		1060	ev_timer_set (&once->to, timeout, 0.);
		1061	ev_timer_start (&once->to);
		1062	}
501	}	1063	}
502
503	ev_stop ((struct ev_watcher *)w);
504	}	1064	}
505		1065
506	void
507	evsignal_start (struct ev_signal *w)
508	{
509	if (ev_is_active (w))
510	return;
511
512	ev_start ((struct ev_watcher *)w, 1);
513	array_needsize (signals, signalmax, w->signum, signals_init);
514	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
515	}
516
517	void
518	evsignal_stop (struct ev_signal *w)
519	{
520	if (!ev_is_active (w))
521	return;
522
523	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
524	ev_stop ((struct ev_watcher *)w);
525	}
526
527	/*****************************************************************************/	1066	/*****************************************************************************/
		1067
528	#if 1	1068	#if 0
		1069
		1070	struct ev_io wio;
529		1071
530	static void	1072	static void
531	sin_cb (struct ev_io *w, int revents)	1073	sin_cb (struct ev_io *w, int revents)
532	{	1074	{
533	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1075	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
535		1077
536	static void	1078	static void
537	ocb (struct ev_timer *w, int revents)	1079	ocb (struct ev_timer *w, int revents)
538	{	1080	{
539	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1081	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
540	evtimer_stop (w);	1082	ev_timer_stop (w);
541	evtimer_start (w);	1083	ev_timer_start (w);
		1084	}
		1085
		1086	static void
		1087	scb (struct ev_signal *w, int revents)
		1088	{
		1089	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1090	ev_io_stop (&wio);
		1091	ev_io_start (&wio);
		1092	}
		1093
		1094	static void
		1095	gcb (struct ev_signal *w, int revents)
		1096	{
		1097	fprintf (stderr, "generic %x\n", revents);
		1098
542	}	1099	}
543		1100
544	int main (void)	1101	int main (void)
545	{	1102	{
546	struct ev_io sin;
547
548	ev_init (0);	1103	ev_init (0);
549		1104
550	evw_init (&sin, sin_cb, 55);
551	evio_set (&sin, 0, EV_READ);	1105	ev_io_init (&wio, sin_cb, 0, EV_READ);
552	evio_start (&sin);	1106	ev_io_start (&wio);
553		1107
554	struct ev_timer t[10000];	1108	struct ev_timer t[10000];
555		1109
556	#if 1	1110	#if 0
557	int i;	1111	int i;
558	for (i = 0; i < 10000; ++i)	1112	for (i = 0; i < 10000; ++i)
559	{	1113	{
560	struct ev_timer *w = t + i;	1114	struct ev_timer *w = t + i;
561	evw_init (w, ocb, i);	1115	ev_watcher_init (w, ocb, i);
562	evtimer_set_abs (w, drand48 (), 0.99775533);	1116	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
563	evtimer_start (w);	1117	ev_timer_start (w);
564	if (drand48 () < 0.5)	1118	if (drand48 () < 0.5)
565	evtimer_stop (w);	1119	ev_timer_stop (w);
566	}	1120	}
567	#endif	1121	#endif
568		1122
569	struct ev_timer t1;	1123	struct ev_timer t1;
570	evw_init (&t1, ocb, 0);	1124	ev_timer_init (&t1, ocb, 5, 10);
571	evtimer_set_abs (&t1, 5, 10);
572	evtimer_start (&t1);	1125	ev_timer_start (&t1);
		1126
		1127	struct ev_signal sig;
		1128	ev_signal_init (&sig, scb, SIGQUIT);
		1129	ev_signal_start (&sig);
		1130
		1131	struct ev_check cw;
		1132	ev_check_init (&cw, gcb);
		1133	ev_check_start (&cw);
		1134
		1135	struct ev_idle iw;
		1136	ev_idle_init (&iw, gcb);
		1137	ev_idle_start (&iw);
573		1138
574	ev_loop (0);	1139	ev_loop (0);
575		1140
576	return 0;	1141	return 0;
577	}	1142	}

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Comparing libev/ev.c (file contents): Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs. Revision 1.36 by root, Thu Nov 1 13:11:11 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.36 by root, Thu Nov 1 13:11:11 2007 UTC