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

Comparing libev/ev.c (file contents):
Revision 1.2 by root, Tue Oct 30 21:42:12 2007 UTC vs.
Revision 1.29 by root, Thu Nov 1 08:10:03 2007 UTC

…		…
		1	/*
		2	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions are
		7	* met:
		8	*
		9	* * Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	*
		12	* * Redistributions in binary form must reproduce the above
		13	* copyright notice, this list of conditions and the following
		14	* disclaimer in the documentation and/or other materials provided
		15	* with the distribution.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		18	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		19	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		20	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		21	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		22	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		23	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		27	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		28	*/
		29	#if EV_USE_CONFIG_H
		30	# include "config.h"
		31	#endif
		32
1	#include <math.h>	33	#include <math.h>
2	#include <stdlib.h>	34	#include <stdlib.h>
		35	#include <unistd.h>
		36	#include <fcntl.h>
		37	#include <signal.h>
		38	#include <stddef.h>
3		39
4	#include <stdio.h>	40	#include <stdio.h>
5		41
		42	#include <assert.h>
6	#include <errno.h>	43	#include <errno.h>
		44	#include <sys/types.h>
		45	#include <sys/wait.h>
7	#include <sys/time.h>	46	#include <sys/time.h>
8	#include <time.h>	47	#include <time.h>
9		48
		49	#ifndef EV_USE_MONOTONIC
10	#ifdef CLOCK_MONOTONIC	50	# ifdef CLOCK_MONOTONIC
11	# define HAVE_MONOTONIC 1	51	# define EV_USE_MONOTONIC 1
12	#endif	52	# endif
		53	#endif
13		54
14	#define HAVE_EPOLL 1	55	#ifndef EV_USE_SELECT
15	#define HAVE_REALTIME 1
16	#define HAVE_SELECT 0	56	# define EV_USE_SELECT 1
		57	#endif
17		58
		59	#ifndef EV_USE_EPOLL
		60	# define EV_USE_EPOLL 0
		61	#endif
		62
		63	#ifndef EV_USE_REALTIME
		64	# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */
		65	#endif
		66
		67	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
18	#define MAX_BLOCKTIME 60.	68	#define MAX_BLOCKTIME 59.731
		69	#define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */
19		70
20	#include "ev.h"	71	#include "ev.h"
21		72
22	struct ev_watcher {	73	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	74	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	75	typedef struct ev_watcher_time *WT;
28	};
29		76
		77	static ev_tstamp now, diff; /* monotonic clock */
30	ev_tstamp ev_now;	78	ev_tstamp ev_now;
31	int ev_method;	79	int ev_method;
32		80
33	static int have_monotonic; /* runtime */	81	static int have_monotonic; /* runtime */
34		82
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	83	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
36	static void (*method_reify)(void);	84	static void (*method_modify)(int fd, int oev, int nev);
37	static void (*method_poll)(ev_tstamp timeout);	85	static void (*method_poll)(ev_tstamp timeout);
		86
		87	/*****************************************************************************/
38		88
39	ev_tstamp	89	ev_tstamp
40	ev_time (void)	90	ev_time (void)
41	{	91	{
42	#if HAVE_REALTIME	92	#if EV_USE_REALTIME
43	struct timespec ts;	93	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	94	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	95	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	96	#else
47	struct timeval tv;	97	struct timeval tv;
51	}	101	}
52		102
53	static ev_tstamp	103	static ev_tstamp
54	get_clock (void)	104	get_clock (void)
55	{	105	{
56	#if HAVE_MONOTONIC	106	#if EV_USE_MONOTONIC
57	if (have_monotonic)	107	if (have_monotonic)
58	{	108	{
59	struct timespec ts;	109	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	110	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	111	return ts.tv_sec + ts.tv_nsec * 1e-9;
…		…
63	#endif	113	#endif
64		114
65	return ev_time ();	115	return ev_time ();
66	}	116	}
67		117
		118	#define array_nextsize(n) (((n) << 1) \| 4 & ~3)
		119	#define array_prevsize(n) (((n) >> 1) \| 4 & ~3)
		120
68	#define array_needsize(base,cur,cnt,init) \	121	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	122	if ((cnt) > cur) \
70	{ \	123	{ \
71	int newcnt = cur ? cur << 1 : 16; \	124	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	125	do \
		126	{ \
		127	newcnt = array_nextsize (newcnt); \
		128	} \
		129	while ((cnt) > newcnt); \
		130	\
73	base = realloc (base, sizeof (base) (newcnt)); \	131	base = realloc (base, sizeof (base) (newcnt)); \
74	init (base + cur, newcnt - cur); \	132	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	133	cur = newcnt; \
76	}	134	}
77		135
		136	/*****************************************************************************/
		137
78	typedef struct	138	typedef struct
79	{	139	{
80	struct ev_io *head;	140	struct ev_io *head;
81	unsigned char wev, rev; /* want, received event set */	141	int events;
82	} ANFD;	142	} ANFD;
83		143
84	static ANFD *anfds;	144	static ANFD *anfds;
85	static int anfdmax;	145	static int anfdmax;
86		146
		147	static void
		148	anfds_init (ANFD *base, int count)
		149	{
		150	while (count--)
		151	{
		152	base->head = 0;
		153	base->events = EV_NONE;
		154	++base;
		155	}
		156	}
		157
		158	typedef struct
		159	{
		160	W w;
		161	int events;
		162	} ANPENDING;
		163
		164	static ANPENDING *pendings;
		165	static int pendingmax, pendingcnt;
		166
		167	static void
		168	event (W w, int events)
		169	{
		170	if (w->active)
		171	{
		172	w->pending = ++pendingcnt;
		173	array_needsize (pendings, pendingmax, pendingcnt, );
		174	pendings [pendingcnt - 1].w = w;
		175	pendings [pendingcnt - 1].events = events;
		176	}
		177	}
		178
		179	static void
		180	queue_events (W *events, int eventcnt, int type)
		181	{
		182	int i;
		183
		184	for (i = 0; i < eventcnt; ++i)
		185	event (events [i], type);
		186	}
		187
		188	static void
		189	fd_event (int fd, int events)
		190	{
		191	ANFD *anfd = anfds + fd;
		192	struct ev_io *w;
		193
		194	for (w = anfd->head; w; w = w->next)
		195	{
		196	int ev = w->events & events;
		197
		198	if (ev)
		199	event ((W)w, ev);
		200	}
		201	}
		202
		203	/*****************************************************************************/
		204
87	static int *fdchanges;	205	static int *fdchanges;
88	static int fdchangemax, fdchangecnt;	206	static int fdchangemax, fdchangecnt;
89		207
90	static void	208	static void
91	anfds_init (ANFD *base, int count)	209	fd_reify (void)
92	{	210	{
93	while (count--)	211	int i;
94	{	212
95	base->head = 0;	213	for (i = 0; i < fdchangecnt; ++i)
96	base->wev = base->rev = EV_NONE;
97	++base;
98	}	214	{
99	}	215	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;	216	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	217	struct ev_io *w;
124		218
		219	int events = 0;
		220
125	for (w = anfd->head; w; w = w->next)	221	for (w = anfd->head; w; w = w->next)
		222	events \|= w->events;
		223
		224	anfd->events &= ~EV_REIFY;
		225
		226	if (anfd->events != events)
		227	{
		228	method_modify (fd, anfd->events, events);
		229	anfd->events = events;
		230	}
126	{	231	}
127	int ev = w->events & events;
128		232
129	if (ev)	233	fdchangecnt = 0;
130	event ((struct ev_watcher *)w, ev);
131	}
132	}	234	}
		235
		236	static void
		237	fd_change (int fd)
		238	{
		239	if (anfds [fd].events & EV_REIFY \|\| fdchangecnt < 0)
		240	return;
		241
		242	anfds [fd].events \|= EV_REIFY;
		243
		244	++fdchangecnt;
		245	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		246	fdchanges [fdchangecnt - 1] = fd;
		247	}
		248
		249	/* called on EBADF to verify fds */
		250	static void
		251	fd_recheck (void)
		252	{
		253	int fd;
		254
		255	for (fd = 0; fd < anfdmax; ++fd)
		256	if (anfds [fd].events)
		257	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		258	while (anfds [fd].head)
		259	{
		260	event ((W)anfds [fd].head, EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT);
		261	ev_io_stop (anfds [fd].head);
		262	}
		263	}
		264
		265	/*****************************************************************************/
133		266
134	static struct ev_timer **timers;	267	static struct ev_timer **timers;
135	static int timermax, timercnt;	268	static int timermax, timercnt;
136		269
		270	static struct ev_periodic **periodics;
		271	static int periodicmax, periodiccnt;
		272
137	static void	273	static void
138	upheap (int k)	274	upheap (WT *timers, int k)
139	{	275	{
140	struct ev_timer *w = timers [k];	276	WT w = timers [k];
141		277
142	while (k && timers [k >> 1]->at > w->at)	278	while (k && timers [k >> 1]->at > w->at)
143	{	279	{
144	timers [k] = timers [k >> 1];	280	timers [k] = timers [k >> 1];
145	timers [k]->active = k + 1;	281	timers [k]->active = k + 1;
…		…
150	timers [k]->active = k + 1;	286	timers [k]->active = k + 1;
151		287
152	}	288	}
153		289
154	static void	290	static void
155	downheap (int k)	291	downheap (WT *timers, int N, int k)
156	{	292	{
157	struct ev_timer *w = timers [k];	293	WT w = timers [k];
158		294
159	while (k < (timercnt >> 1))	295	while (k < (N >> 1))
160	{	296	{
161	int j = k << 1;	297	int j = k << 1;
162		298
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	299	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
164	++j;	300	++j;
165		301
166	if (w->at <= timers [j]->at)	302	if (w->at <= timers [j]->at)
167	break;	303	break;
168		304
…		…
173		309
174	timers [k] = w;	310	timers [k] = w;
175	timers [k]->active = k + 1;	311	timers [k]->active = k + 1;
176	}	312	}
177		313
178	static struct ev_signal **signals;	314	/*****************************************************************************/
		315
		316	typedef struct
		317	{
		318	struct ev_signal *head;
		319	sig_atomic_t gotsig;
		320	} ANSIG;
		321
		322	static ANSIG *signals;
179	static int signalmax, signalcnt;	323	static int signalmax;
180		324
		325	static int sigpipe [2];
		326	static sig_atomic_t gotsig;
		327	static struct ev_io sigev;
		328
181	static void	329	static void
182	signals_init (struct ev_signal **base, int count)	330	signals_init (ANSIG *base, int count)
183	{	331	{
184	while (count--)	332	while (count--)
185	*base++ = 0;	333	{
		334	base->head = 0;
		335	base->gotsig = 0;
		336	++base;
		337	}
186	}	338	}
187		339
		340	static void
		341	sighandler (int signum)
		342	{
		343	signals [signum - 1].gotsig = 1;
		344
		345	if (!gotsig)
		346	{
		347	gotsig = 1;
		348	write (sigpipe [1], &gotsig, 1);
		349	}
		350	}
		351
		352	static void
		353	sigcb (struct ev_io *iow, int revents)
		354	{
		355	struct ev_signal *w;
		356	int sig;
		357
		358	gotsig = 0;
		359	read (sigpipe [0], &revents, 1);
		360
		361	for (sig = signalmax; sig--; )
		362	if (signals [sig].gotsig)
		363	{
		364	signals [sig].gotsig = 0;
		365
		366	for (w = signals [sig].head; w; w = w->next)
		367	event ((W)w, EV_SIGNAL);
		368	}
		369	}
		370
		371	static void
		372	siginit (void)
		373	{
		374	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		375	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		376
		377	/* rather than sort out wether we really need nb, set it */
		378	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		379	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		380
		381	ev_io_set (&sigev, sigpipe [0], EV_READ);
		382	ev_io_start (&sigev);
		383	}
		384
		385	/*****************************************************************************/
		386
		387	static struct ev_idle **idles;
		388	static int idlemax, idlecnt;
		389
		390	static struct ev_prepare **prepares;
		391	static int preparemax, preparecnt;
		392
		393	static struct ev_check **checks;
		394	static int checkmax, checkcnt;
		395
		396	/*****************************************************************************/
		397
		398	static struct ev_child *childs [PID_HASHSIZE];
		399	static struct ev_signal childev;
		400
		401	#ifndef WCONTINUED
		402	# define WCONTINUED 0
		403	#endif
		404
		405	static void
		406	childcb (struct ev_signal *sw, int revents)
		407	{
		408	struct ev_child *w;
		409	int pid, status;
		410
		411	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		412	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		413	if (w->pid == pid \|\| w->pid == -1)
		414	{
		415	w->status = status;
		416	event ((W)w, EV_CHILD);
		417	}
		418	}
		419
		420	/*****************************************************************************/
		421
188	#if HAVE_EPOLL	422	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	423	# include "ev_epoll.c"
190	#endif	424	#endif
191	#if HAVE_SELECT	425	#if EV_USE_SELECT
192	# include "ev_select.c"	426	# include "ev_select.c"
193	#endif	427	#endif
194		428
		429	int
		430	ev_version_major (void)
		431	{
		432	return EV_VERSION_MAJOR;
		433	}
		434
		435	int
		436	ev_version_minor (void)
		437	{
		438	return EV_VERSION_MINOR;
		439	}
		440
195	int ev_init (int flags)	441	int ev_init (int flags)
196	{	442	{
		443	if (!ev_method)
		444	{
197	#if HAVE_MONOTONIC	445	#if EV_USE_MONOTONIC
198	{	446	{
199	struct timespec ts;	447	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	448	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	449	have_monotonic = 1;
202	}	450	}
203	#endif	451	#endif
204		452
205	ev_now = ev_time ();	453	ev_now = ev_time ();
		454	now = get_clock ();
		455	diff = ev_now - now;
206		456
207	#if HAVE_EPOLL	457	if (pipe (sigpipe))
208	if (epoll_init (flags))	458	return 0;
209	return ev_method;
210	#endif
211	#if HAVE_SELECT
212	if (select_init (flags))
213	return ev_method;
214	#endif
215		459
216	ev_method = EVMETHOD_NONE;	460	ev_method = EVMETHOD_NONE;
		461	#if EV_USE_EPOLL
		462	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
		463	#endif
		464	#if EV_USE_SELECT
		465	if (ev_method == EVMETHOD_NONE) select_init (flags);
		466	#endif
		467
		468	if (ev_method)
		469	{
		470	ev_watcher_init (&sigev, sigcb);
		471	siginit ();
		472
		473	ev_signal_init (&childev, childcb, SIGCHLD);
		474	ev_signal_start (&childev);
		475	}
		476	}
		477
217	return ev_method;	478	return ev_method;
218	}	479	}
219		480
		481	/*****************************************************************************/
		482
		483	void
220	void ev_prefork (void)	484	ev_prefork (void)
221	{	485	{
		486	/* nop */
222	}	487	}
223		488
		489	void
224	void ev_postfork_parent (void)	490	ev_postfork_parent (void)
225	{	491	{
		492	/* nop */
226	}	493	}
227		494
		495	void
228	void ev_postfork_child (void)	496	ev_postfork_child (void)
229	{	497	{
230	#if HAVE_EPOLL	498	#if EV_USE_EPOLL
		499	if (ev_method == EVMETHOD_EPOLL)
231	epoll_postfork_child ();	500	epoll_postfork_child ();
232	#endif	501	#endif
233	}
234		502
		503	ev_io_stop (&sigev);
		504	close (sigpipe [0]);
		505	close (sigpipe [1]);
		506	pipe (sigpipe);
		507	siginit ();
		508	}
		509
		510	/*****************************************************************************/
		511
235	static void	512	static void
236	call_pending ()	513	call_pending (void)
237	{	514	{
238	int i;	515	while (pendingcnt)
239
240	for (i = 0; i < pendingcnt; ++i)
241	{	516	{
242	ANPENDING *p = pendings + i;	517	ANPENDING *p = pendings + --pendingcnt;
243		518
244	if (p->w)	519	if (p->w)
245	{	520	{
246	p->w->pending = 0;	521	p->w->pending = 0;
247	p->w->cb (p->w, p->events);	522	p->w->cb (p->w, p->events);
248	}	523	}
249	}	524	}
250
251	pendingcnt = 0;
252	}	525	}
253		526
254	static void	527	static void
255	timer_reify (void)	528	timers_reify (void)
256	{	529	{
257	while (timercnt && timers [0]->at <= ev_now)	530	while (timercnt && timers [0]->at <= now)
258	{	531	{
259	struct ev_timer *w = timers [0];	532	struct ev_timer *w = timers [0];
260		533
261	fprintf (stderr, "0 %f, %d c%d\n", w->at, w->active, timercnt);//D	534	event ((W)w, EV_TIMEOUT);
		535
262	/* first reschedule timer */	536	/* first reschedule or stop timer */
263	if (w->repeat)	537	if (w->repeat)
264	{	538	{
265	fprintf (stderr, "a %f now %f repeat %f, %f\n", w->at, ev_now, w->repeat, w->repeat *1e30);//D
266	if (w->is_abs)
267	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
268	else
269	w->at = ev_now + w->repeat;	539	w->at = now + w->repeat;
270		540	assert (("timer timeout in the past, negative repeat?", w->at > now));
271	fprintf (stderr, "b %f\n", w->at);//D	541	downheap ((WT *)timers, timercnt, 0);
272
273	downheap (0);
274	}	542	}
275	else	543	else
276	{
277	fprintf (stderr, "c %f, %d c%d\n", w->at, w->active, timercnt);//D
278	evtimer_stop (w); /* nonrepeating: stop timer */	544	ev_timer_stop (w); /* nonrepeating: stop timer */
		545	}
		546	}
		547
		548	static void
		549	periodics_reify (void)
		550	{
		551	while (periodiccnt && periodics [0]->at <= ev_now)
		552	{
		553	struct ev_periodic *w = periodics [0];
		554
		555	/* first reschedule or stop timer */
		556	if (w->interval)
279	}	557	{
		558	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		559	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
		560	downheap ((WT *)periodics, periodiccnt, 0);
		561	}
		562	else
		563	ev_periodic_stop (w); /* nonrepeating: stop timer */
280		564
281	event ((struct ev_watcher *)w, EV_TIMEOUT);	565	event ((W)w, EV_TIMEOUT);
		566	}
		567	}
		568
		569	static void
		570	periodics_reschedule (ev_tstamp diff)
		571	{
		572	int i;
		573
		574	/* adjust periodics after time jump */
		575	for (i = 0; i < periodiccnt; ++i)
		576	{
		577	struct ev_periodic *w = periodics [i];
		578
		579	if (w->interval)
		580	{
		581	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		582
		583	if (fabs (diff) >= 1e-4)
		584	{
		585	ev_periodic_stop (w);
		586	ev_periodic_start (w);
		587
		588	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		589	}
		590	}
		591	}
		592	}
		593
		594	static void
		595	time_update (void)
		596	{
		597	int i;
		598
		599	ev_now = ev_time ();
		600
		601	if (have_monotonic)
		602	{
		603	ev_tstamp odiff = diff;
		604
		605	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		606	{
		607	now = get_clock ();
		608	diff = ev_now - now;
		609
		610	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		611	return; /* all is well */
		612
		613	ev_now = ev_time ();
		614	}
		615
		616	periodics_reschedule (diff - odiff);
		617	/* no timer adjustment, as the monotonic clock doesn't jump */
		618	}
		619	else
		620	{
		621	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
		622	{
		623	periodics_reschedule (ev_now - now);
		624
		625	/* adjust timers. this is easy, as the offset is the same for all */
		626	for (i = 0; i < timercnt; ++i)
		627	timers [i]->at += diff;
		628	}
		629
		630	now = ev_now;
282	}	631	}
283	}	632	}
284		633
285	int ev_loop_done;	634	int ev_loop_done;
286		635
287	int ev_loop (int flags)	636	void ev_loop (int flags)
288	{	637	{
289	double block;	638	double block;
290	ev_loop_done = flags & EVLOOP_ONESHOT;	639	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
291		640
292	do	641	do
293	{	642	{
		643	/* queue check watchers (and execute them) */
		644	if (preparecnt)
		645	{
		646	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		647	call_pending ();
		648	}
		649
294	/* update fd-related kernel structures */	650	/* update fd-related kernel structures */
295	method_reify (); fdchangecnt = 0;	651	fd_reify ();
296		652
297	/* calculate blocking time */	653	/* calculate blocking time */
		654
		655	/* we only need this for !monotonic clockor timers, but as we basically
		656	always have timers, we just calculate it always */
298	ev_now = ev_time ();	657	ev_now = ev_time ();
299		658
300	if (flags & EVLOOP_NONBLOCK)	659	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
301	block = 0.;	660	block = 0.;
302	else if (!timercnt)
303	block = MAX_BLOCKTIME;
304	else	661	else
305	{	662	{
		663	block = MAX_BLOCKTIME;
		664
		665	if (timercnt)
		666	{
		667	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
		668	if (block > to) block = to;
		669	}
		670
		671	if (periodiccnt)
		672	{
306	block = timers [0]->at - ev_now + method_fudge;	673	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
		674	if (block > to) block = to;
		675	}
		676
307	if (block < 0.) block = 0.;	677	if (block < 0.) block = 0.;
308	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
309	}	678	}
310		679
311	fprintf (stderr, "block %f\n", block);//D
312	method_poll (block);	680	method_poll (block);
313		681
		682	/* update ev_now, do magic */
		683	time_update ();
		684
314	/* put pending timers into pendign queue and reschedule them */	685	/* queue pending timers and reschedule them */
315	timer_reify ();	686	timers_reify (); /* relative timers called last */
		687	periodics_reify (); /* absolute timers called first */
316		688
317	ev_now = ev_time ();	689	/* queue idle watchers unless io or timers are pending */
		690	if (!pendingcnt)
		691	queue_events ((W *)idles, idlecnt, EV_IDLE);
		692
		693	/* queue check watchers, to be executed first */
		694	if (checkcnt)
		695	queue_events ((W *)checks, checkcnt, EV_CHECK);
		696
318	call_pending ();	697	call_pending ();
319	}	698	}
320	while (!ev_loop_done);	699	while (!ev_loop_done);
321	}
322		700
		701	if (ev_loop_done != 2)
		702	ev_loop_done = 0;
		703	}
		704
		705	/*****************************************************************************/
		706
323	static void	707	static void
324	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	708	wlist_add (WL *head, WL elem)
325	{	709	{
326	elem->next = *head;	710	elem->next = *head;
327	*head = elem;	711	*head = elem;
328	}	712	}
329		713
330	static void	714	static void
331	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	715	wlist_del (WL *head, WL elem)
332	{	716	{
333	while (*head)	717	while (*head)
334	{	718	{
335	if (*head == elem)	719	if (*head == elem)
336	{	720	{
…		…
341	head = &(*head)->next;	725	head = &(*head)->next;
342	}	726	}
343	}	727	}
344		728
345	static void	729	static void
346	ev_start (struct ev_watcher *w, int active)	730	ev_clear (W w)
347	{	731	{
		732	if (w->pending)
		733	{
		734	pendings [w->pending - 1].w = 0;
348	w->pending = 0;	735	w->pending = 0;
		736	}
		737	}
		738
		739	static void
		740	ev_start (W w, int active)
		741	{
349	w->active = active;	742	w->active = active;
350	}	743	}
351		744
352	static void	745	static void
353	ev_stop (struct ev_watcher *w)	746	ev_stop (W w)
354	{	747	{
355	if (w->pending)
356	pendings [w->pending - 1].w = 0;
357
358	w->active = 0;	748	w->active = 0;
359	/* nop */
360	}	749	}
361		750
		751	/*****************************************************************************/
		752
362	void	753	void
363	evio_start (struct ev_io *w)	754	ev_io_start (struct ev_io *w)
364	{	755	{
365	if (ev_is_active (w))	756	if (ev_is_active (w))
366	return;	757	return;
367		758
368	int fd = w->fd;	759	int fd = w->fd;
369		760
370	ev_start ((struct ev_watcher *)w, 1);	761	ev_start ((W)w, 1);
371	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	762	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
372	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	763	wlist_add ((WL *)&anfds[fd].head, (WL)w);
373		764
374	++fdchangecnt;	765	fd_change (fd);
375	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
376	fdchanges [fdchangecnt - 1] = fd;
377	}	766	}
378		767
379	void	768	void
380	evio_stop (struct ev_io *w)	769	ev_io_stop (struct ev_io *w)
381	{	770	{
		771	ev_clear ((W)w);
382	if (!ev_is_active (w))	772	if (!ev_is_active (w))
383	return;	773	return;
384		774
385	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	775	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
386	ev_stop ((struct ev_watcher *)w);	776	ev_stop ((W)w);
387		777
388	++fdchangecnt;	778	fd_change (w->fd);
389	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
390	fdchanges [fdchangecnt - 1] = w->fd;
391	}	779	}
392		780
393	void	781	void
394	evtimer_start (struct ev_timer *w)	782	ev_timer_start (struct ev_timer *w)
395	{	783	{
396	if (ev_is_active (w))	784	if (ev_is_active (w))
397	return;	785	return;
398		786
399	fprintf (stderr, "t1 %f a %d\n", w->at, w->is_abs);//D
400	if (w->is_abs)
401	{
402	/* this formula differs from the one in timer_reify becuse we do not round up */
403	if (w->repeat)
404	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
405	}
406	else
407	w->at += ev_now;	787	w->at += now;
408	fprintf (stderr, "t2 %f a %d\n", w->at, w->is_abs);//D
409		788
410	ev_start ((struct ev_watcher *)w, ++timercnt);	789	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
		790
		791	ev_start ((W)w, ++timercnt);
411	array_needsize (timers, timermax, timercnt, );	792	array_needsize (timers, timermax, timercnt, );
412	timers [timercnt - 1] = w;	793	timers [timercnt - 1] = w;
413	upheap (timercnt - 1);	794	upheap ((WT *)timers, timercnt - 1);
414	}	795	}
415		796
416	void	797	void
417	evtimer_stop (struct ev_timer *w)	798	ev_timer_stop (struct ev_timer *w)
418	{	799	{
419	fprintf (stderr, "-topping %d, %d\n", w->active, timercnt);//D	800	ev_clear ((W)w);
420	if (!ev_is_active (w))	801	if (!ev_is_active (w))
421	return;	802	return;
422		803
423	fprintf (stderr, "stopping %d, %d\n", w->active, timercnt);//D
424	if (w->active < timercnt)	804	if (w->active < timercnt--)
425	{	805	{
426	timers [w->active - 1] = timers [--timercnt];	806	timers [w->active - 1] = timers [timercnt];
427	downheap (w->active - 1);	807	downheap ((WT *)timers, timercnt, w->active - 1);
		808	}
		809
		810	w->at = w->repeat;
		811
		812	ev_stop ((W)w);
		813	}
		814
		815	void
		816	ev_timer_again (struct ev_timer *w)
		817	{
		818	if (ev_is_active (w))
428	}	819	{
429		820	if (w->repeat)
430	ev_stop ((struct ev_watcher *)w);	821	{
		822	w->at = now + w->repeat;
		823	downheap ((WT *)timers, timercnt, w->active - 1);
		824	}
		825	else
		826	ev_timer_stop (w);
		827	}
		828	else if (w->repeat)
		829	ev_timer_start (w);
431	}	830	}
432		831
433	void	832	void
		833	ev_periodic_start (struct ev_periodic *w)
		834	{
		835	if (ev_is_active (w))
		836	return;
		837
		838	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
		839
		840	/* this formula differs from the one in periodic_reify because we do not always round up */
		841	if (w->interval)
		842	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		843
		844	ev_start ((W)w, ++periodiccnt);
		845	array_needsize (periodics, periodicmax, periodiccnt, );
		846	periodics [periodiccnt - 1] = w;
		847	upheap ((WT *)periodics, periodiccnt - 1);
		848	}
		849
		850	void
		851	ev_periodic_stop (struct ev_periodic *w)
		852	{
		853	ev_clear ((W)w);
		854	if (!ev_is_active (w))
		855	return;
		856
		857	if (w->active < periodiccnt--)
		858	{
		859	periodics [w->active - 1] = periodics [periodiccnt];
		860	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		861	}
		862
		863	ev_stop ((W)w);
		864	}
		865
		866	void
434	evsignal_start (struct ev_signal *w)	867	ev_signal_start (struct ev_signal *w)
435	{	868	{
436	if (ev_is_active (w))	869	if (ev_is_active (w))
437	return;	870	return;
438		871
439	ev_start ((struct ev_watcher *)w, 1);	872	ev_start ((W)w, 1);
440	array_needsize (signals, signalmax, w->signum, signals_init);	873	array_needsize (signals, signalmax, w->signum, signals_init);
441	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	874	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
442	}
443		875
		876	if (!w->next)
		877	{
		878	struct sigaction sa;
		879	sa.sa_handler = sighandler;
		880	sigfillset (&sa.sa_mask);
		881	sa.sa_flags = 0;
		882	sigaction (w->signum, &sa, 0);
		883	}
		884	}
		885
444	void	886	void
445	evsignal_stop (struct ev_signal *w)	887	ev_signal_stop (struct ev_signal *w)
446	{	888	{
		889	ev_clear ((W)w);
447	if (!ev_is_active (w))	890	if (!ev_is_active (w))
448	return;	891	return;
449		892
450	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	893	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		894	ev_stop ((W)w);
		895
		896	if (!signals [w->signum - 1].head)
		897	signal (w->signum, SIG_DFL);
		898	}
		899
		900	void
		901	ev_idle_start (struct ev_idle *w)
		902	{
		903	if (ev_is_active (w))
		904	return;
		905
		906	ev_start ((W)w, ++idlecnt);
		907	array_needsize (idles, idlemax, idlecnt, );
		908	idles [idlecnt - 1] = w;
		909	}
		910
		911	void
		912	ev_idle_stop (struct ev_idle *w)
		913	{
		914	ev_clear ((W)w);
		915	if (ev_is_active (w))
		916	return;
		917
		918	idles [w->active - 1] = idles [--idlecnt];
		919	ev_stop ((W)w);
		920	}
		921
		922	void
		923	ev_prepare_start (struct ev_prepare *w)
		924	{
		925	if (ev_is_active (w))
		926	return;
		927
		928	ev_start ((W)w, ++preparecnt);
		929	array_needsize (prepares, preparemax, preparecnt, );
		930	prepares [preparecnt - 1] = w;
		931	}
		932
		933	void
		934	ev_prepare_stop (struct ev_prepare *w)
		935	{
		936	ev_clear ((W)w);
		937	if (ev_is_active (w))
		938	return;
		939
		940	prepares [w->active - 1] = prepares [--preparecnt];
		941	ev_stop ((W)w);
		942	}
		943
		944	void
		945	ev_check_start (struct ev_check *w)
		946	{
		947	if (ev_is_active (w))
		948	return;
		949
		950	ev_start ((W)w, ++checkcnt);
		951	array_needsize (checks, checkmax, checkcnt, );
		952	checks [checkcnt - 1] = w;
		953	}
		954
		955	void
451	ev_stop ((struct ev_watcher *)w);	956	ev_check_stop (struct ev_check *w)
452	}	957	{
		958	ev_clear ((W)w);
		959	if (ev_is_active (w))
		960	return;
453		961
		962	checks [w->active - 1] = checks [--checkcnt];
		963	ev_stop ((W)w);
		964	}
		965
		966	void
		967	ev_child_start (struct ev_child *w)
		968	{
		969	if (ev_is_active (w))
		970	return;
		971
		972	ev_start ((W)w, 1);
		973	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		974	}
		975
		976	void
		977	ev_child_stop (struct ev_child *w)
		978	{
		979	ev_clear ((W)w);
		980	if (ev_is_active (w))
		981	return;
		982
		983	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		984	ev_stop ((W)w);
		985	}
		986
454	/*****************************************************************************/	987	/*****************************************************************************/
		988
		989	struct ev_once
		990	{
		991	struct ev_io io;
		992	struct ev_timer to;
		993	void (cb)(int revents, void arg);
		994	void *arg;
		995	};
		996
		997	static void
		998	once_cb (struct ev_once *once, int revents)
		999	{
		1000	void (cb)(int revents, void arg) = once->cb;
		1001	void *arg = once->arg;
		1002
		1003	ev_io_stop (&once->io);
		1004	ev_timer_stop (&once->to);
		1005	free (once);
		1006
		1007	cb (revents, arg);
		1008	}
		1009
		1010	static void
		1011	once_cb_io (struct ev_io *w, int revents)
		1012	{
		1013	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1014	}
		1015
		1016	static void
		1017	once_cb_to (struct ev_timer *w, int revents)
		1018	{
		1019	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1020	}
		1021
		1022	void
		1023	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1024	{
		1025	struct ev_once *once = malloc (sizeof (struct ev_once));
		1026
		1027	if (!once)
		1028	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1029	else
		1030	{
		1031	once->cb = cb;
		1032	once->arg = arg;
		1033
		1034	ev_watcher_init (&once->io, once_cb_io);
		1035	if (fd >= 0)
		1036	{
		1037	ev_io_set (&once->io, fd, events);
		1038	ev_io_start (&once->io);
		1039	}
		1040
		1041	ev_watcher_init (&once->to, once_cb_to);
		1042	if (timeout >= 0.)
		1043	{
		1044	ev_timer_set (&once->to, timeout, 0.);
		1045	ev_timer_start (&once->to);
		1046	}
		1047	}
		1048	}
		1049
		1050	/*****************************************************************************/
		1051
455	#if 1	1052	#if 0
		1053
		1054	struct ev_io wio;
456		1055
457	static void	1056	static void
458	sin_cb (struct ev_io *w, int revents)	1057	sin_cb (struct ev_io *w, int revents)
459	{	1058	{
460	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1059	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
461	}	1060	}
462		1061
463	static void	1062	static void
464	ocb (struct ev_timer *w, int revents)	1063	ocb (struct ev_timer *w, int revents)
465	{	1064	{
466	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1065	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1066	ev_timer_stop (w);
		1067	ev_timer_start (w);
		1068	}
		1069
		1070	static void
		1071	scb (struct ev_signal *w, int revents)
		1072	{
		1073	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1074	ev_io_stop (&wio);
		1075	ev_io_start (&wio);
		1076	}
		1077
		1078	static void
		1079	gcb (struct ev_signal *w, int revents)
		1080	{
		1081	fprintf (stderr, "generic %x\n", revents);
		1082
467	}	1083	}
468		1084
469	int main (void)	1085	int main (void)
470	{	1086	{
471	struct ev_io sin;
472
473	ev_init (0);	1087	ev_init (0);
474		1088
475	evw_init (&sin, sin_cb, 55);
476	evio_set (&sin, 0, EV_READ);	1089	ev_io_init (&wio, sin_cb, 0, EV_READ);
477	evio_start (&sin);	1090	ev_io_start (&wio);
478		1091
479	struct ev_timer t[1000];	1092	struct ev_timer t[10000];
480		1093
		1094	#if 0
481	int i;	1095	int i;
482	for (i = 0; i < 1000; ++i)	1096	for (i = 0; i < 10000; ++i)
483	{	1097	{
484	struct ev_timer *w = t + i;	1098	struct ev_timer *w = t + i;
485	evw_init (w, ocb, i);	1099	ev_watcher_init (w, ocb, i);
486	evtimer_set_rel (w, drand48 (), 0);	1100	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
487	evtimer_start (w);	1101	ev_timer_start (w);
488	if (drand48 () < 0.5)	1102	if (drand48 () < 0.5)
489	evtimer_stop (w);	1103	ev_timer_stop (w);
490	}	1104	}
		1105	#endif
		1106
		1107	struct ev_timer t1;
		1108	ev_timer_init (&t1, ocb, 5, 10);
		1109	ev_timer_start (&t1);
		1110
		1111	struct ev_signal sig;
		1112	ev_signal_init (&sig, scb, SIGQUIT);
		1113	ev_signal_start (&sig);
		1114
		1115	struct ev_check cw;
		1116	ev_check_init (&cw, gcb);
		1117	ev_check_start (&cw);
		1118
		1119	struct ev_idle iw;
		1120	ev_idle_init (&iw, gcb);
		1121	ev_idle_start (&iw);
491		1122
492	ev_loop (0);	1123	ev_loop (0);
493		1124
494	return 0;	1125	return 0;
495	}	1126	}

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Comparing libev/ev.c (file contents): Revision 1.2 by root, Tue Oct 30 21:42:12 2007 UTC vs. Revision 1.29 by root, Thu Nov 1 08:10:03 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.2 by root, Tue Oct 30 21:42:12 2007 UTC vs.
Revision 1.29 by root, Thu Nov 1 08:10:03 2007 UTC