[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 1.27 by root, Wed Oct 31 22:16:36 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
1	#include <math.h>	30	#include <math.h>
2	#include <stdlib.h>	31	#include <stdlib.h>
		32	#include <unistd.h>
		33	#include <fcntl.h>
		34	#include <signal.h>
		35	#include <stddef.h>
3		36
4	#include <stdio.h>	37	#include <stdio.h>
5		38
6	#include <assert.h>	39	#include <assert.h>
7	#include <errno.h>	40	#include <errno.h>
		41	#include <sys/types.h>
		42	#include <sys/wait.h>
8	#include <sys/time.h>	43	#include <sys/time.h>
9	#include <time.h>	44	#include <time.h>
10		45
		46	#ifndef HAVE_MONOTONIC
11	#ifdef CLOCK_MONOTONIC	47	# ifdef CLOCK_MONOTONIC
12	# define HAVE_MONOTONIC 1	48	# define HAVE_MONOTONIC 1
13	#endif	49	# endif
		50	#endif
14		51
15	#define HAVE_EPOLL 1	52	#ifndef HAVE_SELECT
16	#define HAVE_REALTIME 1
17	#define HAVE_SELECT 0	53	# define HAVE_SELECT 1
		54	#endif
		55
		56	#ifndef HAVE_EPOLL
		57	# define HAVE_EPOLL 0
		58	#endif
		59
		60	#ifndef HAVE_REALTIME
		61	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */
		62	#endif
18		63
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	64	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	65	#define MAX_BLOCKTIME 60.
		66	#define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */
21		67
22	#include "ev.h"	68	#include "ev.h"
23		69
24	struct ev_watcher {	70	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	71	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	72	typedef struct ev_watcher_time *WT;
30	};
31		73
32	static ev_tstamp now, diff; /* monotonic clock */	74	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	75	ev_tstamp ev_now;
34	int ev_method;	76	int ev_method;
35		77
36	static int have_monotonic; /* runtime */	78	static int have_monotonic; /* runtime */
37		79
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	80	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
39	static void (*method_reify)(void);	81	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);	82	static void (*method_poll)(ev_tstamp timeout);
		83
		84	/*****************************************************************************/
41		85
42	ev_tstamp	86	ev_tstamp
43	ev_time (void)	87	ev_time (void)
44	{	88	{
45	#if HAVE_REALTIME	89	#if HAVE_REALTIME
69	}	113	}
70		114
71	#define array_needsize(base,cur,cnt,init) \	115	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	116	if ((cnt) > cur) \
73	{ \	117	{ \
74	int newcnt = cur ? cur << 1 : 16; \	118	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	119	do \
		120	{ \
		121	newcnt = (newcnt << 1) \| 4 & ~3; \
		122	} \
		123	while ((cnt) > newcnt); \
		124	\
76	base = realloc (base, sizeof (base) (newcnt)); \	125	base = realloc (base, sizeof (base) (newcnt)); \
77	init (base + cur, newcnt - cur); \	126	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	127	cur = newcnt; \
79	}	128	}
80		129
		130	/*****************************************************************************/
		131
81	typedef struct	132	typedef struct
82	{	133	{
83	struct ev_io *head;	134	struct ev_io *head;
84	unsigned char wev, rev; /* want, received event set */	135	int events;
85	} ANFD;	136	} ANFD;
86		137
87	static ANFD *anfds;	138	static ANFD *anfds;
88	static int anfdmax;	139	static int anfdmax;
89		140
		141	static void
		142	anfds_init (ANFD *base, int count)
		143	{
		144	while (count--)
		145	{
		146	base->head = 0;
		147	base->events = EV_NONE;
		148	++base;
		149	}
		150	}
		151
		152	typedef struct
		153	{
		154	W w;
		155	int events;
		156	} ANPENDING;
		157
		158	static ANPENDING *pendings;
		159	static int pendingmax, pendingcnt;
		160
		161	static void
		162	event (W w, int events)
		163	{
		164	if (w->active)
		165	{
		166	w->pending = ++pendingcnt;
		167	array_needsize (pendings, pendingmax, pendingcnt, );
		168	pendings [pendingcnt - 1].w = w;
		169	pendings [pendingcnt - 1].events = events;
		170	}
		171	}
		172
		173	static void
		174	queue_events (W *events, int eventcnt, int type)
		175	{
		176	int i;
		177
		178	for (i = 0; i < eventcnt; ++i)
		179	event (events [i], type);
		180	}
		181
		182	static void
		183	fd_event (int fd, int events)
		184	{
		185	ANFD *anfd = anfds + fd;
		186	struct ev_io *w;
		187
		188	for (w = anfd->head; w; w = w->next)
		189	{
		190	int ev = w->events & events;
		191
		192	if (ev)
		193	event ((W)w, ev);
		194	}
		195	}
		196
		197	/*****************************************************************************/
		198
90	static int *fdchanges;	199	static int *fdchanges;
91	static int fdchangemax, fdchangecnt;	200	static int fdchangemax, fdchangecnt;
92		201
93	static void	202	static void
94	anfds_init (ANFD *base, int count)	203	fd_reify (void)
95	{	204	{
96	while (count--)	205	int i;
97	{	206
98	base->head = 0;	207	for (i = 0; i < fdchangecnt; ++i)
99	base->wev = base->rev = EV_NONE;
100	++base;
101	}	208	{
102	}	209	int fd = fdchanges [i];
103
104	typedef struct
105	{
106	struct ev_watcher *w;
107	int events;
108	} ANPENDING;
109
110	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;
112
113	static void
114	event (struct ev_watcher *w, int events)
115	{
116	w->pending = ++pendingcnt;
117	array_needsize (pendings, pendingmax, pendingcnt, );
118	pendings [pendingcnt - 1].w = w;
119	pendings [pendingcnt - 1].events = events;
120	}
121
122	static void
123	fd_event (int fd, int events)
124	{
125	ANFD *anfd = anfds + fd;	210	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	211	struct ev_io *w;
127		212
		213	int events = 0;
		214
128	for (w = anfd->head; w; w = w->next)	215	for (w = anfd->head; w; w = w->next)
		216	events \|= w->events;
		217
		218	anfd->events &= ~EV_REIFY;
		219
		220	if (anfd->events != events)
		221	{
		222	method_modify (fd, anfd->events, events);
		223	anfd->events = events;
		224	}
129	{	225	}
130	int ev = w->events & events;
131		226
132	if (ev)	227	fdchangecnt = 0;
133	event ((struct ev_watcher *)w, ev);
134	}
135	}	228	}
136		229
		230	static void
		231	fd_change (int fd)
		232	{
		233	if (anfds [fd].events & EV_REIFY)
		234	return;
		235
		236	anfds [fd].events \|= EV_REIFY;
		237
		238	++fdchangecnt;
		239	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		240	fdchanges [fdchangecnt - 1] = fd;
		241	}
		242
		243	/* called on EBADF to verify fds */
		244	static void
		245	fd_recheck (void)
		246	{
		247	int fd;
		248
		249	for (fd = 0; fd < anfdmax; ++fd)
		250	if (anfds [fd].events)
		251	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		252	while (anfds [fd].head)
		253	{
		254	event ((W)anfds [fd].head, EV_ERROR);
		255	evio_stop (anfds [fd].head);
		256	}
		257	}
		258
		259	/*****************************************************************************/
		260
137	static struct ev_timer **atimers;	261	static struct ev_timer **timers;
138	static int atimermax, atimercnt;	262	static int timermax, timercnt;
139		263
140	static struct ev_timer **rtimers;	264	static struct ev_periodic **periodics;
141	static int rtimermax, rtimercnt;	265	static int periodicmax, periodiccnt;
142		266
143	static void	267	static void
144	upheap (struct ev_timer **timers, int k)	268	upheap (WT *timers, int k)
145	{	269	{
146	struct ev_timer *w = timers [k];	270	WT w = timers [k];
147		271
148	while (k && timers [k >> 1]->at > w->at)	272	while (k && timers [k >> 1]->at > w->at)
149	{	273	{
150	timers [k] = timers [k >> 1];	274	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;	275	timers [k]->active = k + 1;
…		…
156	timers [k]->active = k + 1;	280	timers [k]->active = k + 1;
157		281
158	}	282	}
159		283
160	static void	284	static void
161	downheap (struct ev_timer **timers, int N, int k)	285	downheap (WT *timers, int N, int k)
162	{	286	{
163	struct ev_timer *w = timers [k];	287	WT w = timers [k];
164		288
165	while (k < (N >> 1))	289	while (k < (N >> 1))
166	{	290	{
167	int j = k << 1;	291	int j = k << 1;
168		292
…		…
179		303
180	timers [k] = w;	304	timers [k] = w;
181	timers [k]->active = k + 1;	305	timers [k]->active = k + 1;
182	}	306	}
183		307
184	static struct ev_signal **signals;	308	/*****************************************************************************/
		309
		310	typedef struct
		311	{
		312	struct ev_signal *head;
		313	sig_atomic_t gotsig;
		314	} ANSIG;
		315
		316	static ANSIG *signals;
185	static int signalmax;	317	static int signalmax;
186		318
		319	static int sigpipe [2];
		320	static sig_atomic_t gotsig;
		321	static struct ev_io sigev;
		322
187	static void	323	static void
188	signals_init (struct ev_signal **base, int count)	324	signals_init (ANSIG *base, int count)
189	{	325	{
190	while (count--)	326	while (count--)
191	*base++ = 0;	327	{
		328	base->head = 0;
		329	base->gotsig = 0;
		330	++base;
		331	}
192	}	332	}
		333
		334	static void
		335	sighandler (int signum)
		336	{
		337	signals [signum - 1].gotsig = 1;
		338
		339	if (!gotsig)
		340	{
		341	gotsig = 1;
		342	write (sigpipe [1], &gotsig, 1);
		343	}
		344	}
		345
		346	static void
		347	sigcb (struct ev_io *iow, int revents)
		348	{
		349	struct ev_signal *w;
		350	int sig;
		351
		352	gotsig = 0;
		353	read (sigpipe [0], &revents, 1);
		354
		355	for (sig = signalmax; sig--; )
		356	if (signals [sig].gotsig)
		357	{
		358	signals [sig].gotsig = 0;
		359
		360	for (w = signals [sig].head; w; w = w->next)
		361	event ((W)w, EV_SIGNAL);
		362	}
		363	}
		364
		365	static void
		366	siginit (void)
		367	{
		368	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		369	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		370
		371	/* rather than sort out wether we really need nb, set it */
		372	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		373	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		374
		375	evio_set (&sigev, sigpipe [0], EV_READ);
		376	evio_start (&sigev);
		377	}
		378
		379	/*****************************************************************************/
		380
		381	static struct ev_idle **idles;
		382	static int idlemax, idlecnt;
		383
		384	static struct ev_prepare **prepares;
		385	static int preparemax, preparecnt;
		386
		387	static struct ev_check **checks;
		388	static int checkmax, checkcnt;
		389
		390	/*****************************************************************************/
		391
		392	static struct ev_child *childs [PID_HASHSIZE];
		393	static struct ev_signal childev;
		394
		395	#ifndef WCONTINUED
		396	# define WCONTINUED 0
		397	#endif
		398
		399	static void
		400	childcb (struct ev_signal *sw, int revents)
		401	{
		402	struct ev_child *w;
		403	int pid, status;
		404
		405	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		406	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		407	if (w->pid == pid \|\| w->pid == -1)
		408	{
		409	w->status = status;
		410	event ((W)w, EV_CHILD);
		411	}
		412	}
		413
		414	/*****************************************************************************/
193		415
194	#if HAVE_EPOLL	416	#if HAVE_EPOLL
195	# include "ev_epoll.c"	417	# include "ev_epoll.c"
196	#endif	418	#endif
197	#if HAVE_SELECT	419	#if HAVE_SELECT
198	# include "ev_select.c"	420	# include "ev_select.c"
199	#endif	421	#endif
200		422
		423	int
		424	ev_version_major (void)
		425	{
		426	return EV_VERSION_MAJOR;
		427	}
		428
		429	int
		430	ev_version_minor (void)
		431	{
		432	return EV_VERSION_MINOR;
		433	}
		434
201	int ev_init (int flags)	435	int ev_init (int flags)
202	{	436	{
		437	if (!ev_method)
		438	{
203	#if HAVE_MONOTONIC	439	#if HAVE_MONOTONIC
204	{	440	{
205	struct timespec ts;	441	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	442	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	443	have_monotonic = 1;
208	}	444	}
209	#endif	445	#endif
210		446
211	ev_now = ev_time ();	447	ev_now = ev_time ();
212	now = get_clock ();	448	now = get_clock ();
213	diff = ev_now - now;	449	diff = ev_now - now;
214		450
		451	if (pipe (sigpipe))
		452	return 0;
		453
		454	ev_method = EVMETHOD_NONE;
215	#if HAVE_EPOLL	455	#if HAVE_EPOLL
216	if (epoll_init (flags))	456	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
217	return ev_method;
218	#endif	457	#endif
219	#if HAVE_SELECT	458	#if HAVE_SELECT
220	if (select_init (flags))	459	if (ev_method == EVMETHOD_NONE) select_init (flags);
221	return ev_method;
222	#endif	460	#endif
223		461
224	ev_method = EVMETHOD_NONE;	462	if (ev_method)
		463	{
		464	evw_init (&sigev, sigcb);
		465	siginit ();
		466
		467	evsignal_init (&childev, childcb, SIGCHLD);
		468	evsignal_start (&childev);
		469	}
		470	}
		471
225	return ev_method;	472	return ev_method;
226	}	473	}
227		474
		475	/*****************************************************************************/
		476
		477	void
228	void ev_prefork (void)	478	ev_prefork (void)
229	{	479	{
		480	/* nop */
230	}	481	}
231		482
		483	void
232	void ev_postfork_parent (void)	484	ev_postfork_parent (void)
233	{	485	{
		486	/* nop */
234	}	487	}
235		488
		489	void
236	void ev_postfork_child (void)	490	ev_postfork_child (void)
237	{	491	{
238	#if HAVE_EPOLL	492	#if HAVE_EPOLL
		493	if (ev_method == EVMETHOD_EPOLL)
239	epoll_postfork_child ();	494	epoll_postfork_child ();
240	#endif	495	#endif
241	}
242		496
		497	evio_stop (&sigev);
		498	close (sigpipe [0]);
		499	close (sigpipe [1]);
		500	pipe (sigpipe);
		501	siginit ();
		502	}
		503
		504	/*****************************************************************************/
		505
243	static void	506	static void
244	call_pending ()	507	call_pending (void)
245	{	508	{
246	int i;	509	while (pendingcnt)
247
248	for (i = 0; i < pendingcnt; ++i)
249	{	510	{
250	ANPENDING *p = pendings + i;	511	ANPENDING *p = pendings + --pendingcnt;
251		512
252	if (p->w)	513	if (p->w)
253	{	514	{
254	p->w->pending = 0;	515	p->w->pending = 0;
255	p->w->cb (p->w, p->events);	516	p->w->cb (p->w, p->events);
256	}	517	}
257	}	518	}
258
259	pendingcnt = 0;
260	}	519	}
261		520
262	static void	521	static void
263	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	522	timers_reify (void)
264	{	523	{
265	while (timercnt && timers [0]->at <= now)	524	while (timercnt && timers [0]->at <= now)
266	{	525	{
267	struct ev_timer *w = timers [0];	526	struct ev_timer *w = timers [0];
		527
		528	event ((W)w, EV_TIMEOUT);
268		529
269	/* first reschedule or stop timer */	530	/* first reschedule or stop timer */
270	if (w->repeat)	531	if (w->repeat)
271	{	532	{
272	if (w->is_abs)
273	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
274	else
275	w->at = now + w->repeat;	533	w->at = now + w->repeat;
276		534	assert (("timer timeout in the past, negative repeat?", w->at > now));
277	assert (w->at > now);
278
279	downheap (timers, timercnt, 0);	535	downheap ((WT *)timers, timercnt, 0);
280	}	536	}
281	else	537	else
282	{
283	evtimer_stop (w); /* nonrepeating: stop timer */	538	evtimer_stop (w); /* nonrepeating: stop timer */
284	--timercnt; /* maybe pass by reference instead? */	539	}
		540	}
		541
		542	static void
		543	periodics_reify (void)
		544	{
		545	while (periodiccnt && periodics [0]->at <= ev_now)
		546	{
		547	struct ev_periodic *w = periodics [0];
		548
		549	/* first reschedule or stop timer */
		550	if (w->interval)
285	}	551	{
		552	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		553	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
		554	downheap ((WT *)periodics, periodiccnt, 0);
		555	}
		556	else
		557	evperiodic_stop (w); /* nonrepeating: stop timer */
286		558
287	event ((struct ev_watcher *)w, EV_TIMEOUT);	559	event ((W)w, EV_TIMEOUT);
288	}	560	}
289	}	561	}
290		562
291	static void	563	static void
292	time_update ()	564	periodics_reschedule (ev_tstamp diff)
293	{	565	{
294	int i;	566	int i;
		567
		568	/* adjust periodics after time jump */
		569	for (i = 0; i < periodiccnt; ++i)
		570	{
		571	struct ev_periodic *w = periodics [i];
		572
		573	if (w->interval)
		574	{
		575	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		576
		577	if (fabs (diff) >= 1e-4)
		578	{
		579	evperiodic_stop (w);
		580	evperiodic_start (w);
		581
		582	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		583	}
		584	}
		585	}
		586	}
		587
		588	static void
		589	time_update (void)
		590	{
		591	int i;
		592
295	ev_now = ev_time ();	593	ev_now = ev_time ();
296		594
297	if (have_monotonic)	595	if (have_monotonic)
298	{	596	{
299	ev_tstamp odiff = diff;	597	ev_tstamp odiff = diff;
300		598
301	/* detecting time jumps is much more difficult */
302	for (i = 2; --i; ) /* loop a few times, before making important decisions */	599	for (i = 4; --i; ) /* loop a few times, before making important decisions */
303	{	600	{
304	now = get_clock ();	601	now = get_clock ();
305	diff = ev_now - now;	602	diff = ev_now - now;
306		603
307	if (fabs (odiff - diff) < MIN_TIMEJUMP)	604	if (fabs (odiff - diff) < MIN_TIMEJUMP)
308	return; /* all is well */	605	return; /* all is well */
309		606
310	ev_now = ev_time ();	607	ev_now = ev_time ();
311	}	608	}
312		609
313	/* time jump detected, reschedule atimers */	610	periodics_reschedule (diff - odiff);
314	for (i = 0; i < atimercnt; ++i)	611	/* 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	}	612	}
320	else	613	else
321	{	614	{
322	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	615	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
323	/* time jump detected, adjust rtimers */	616	{
		617	periodics_reschedule (ev_now - now);
		618
		619	/* adjust timers. this is easy, as the offset is the same for all */
324	for (i = 0; i < rtimercnt; ++i)	620	for (i = 0; i < timercnt; ++i)
325	rtimers [i]->at += ev_now - now;	621	timers [i]->at += diff;
		622	}
326		623
327	now = ev_now;	624	now = ev_now;
328	}	625	}
329	}	626	}
330		627
331	int ev_loop_done;	628	int ev_loop_done;
332		629
333	void ev_loop (int flags)	630	void ev_loop (int flags)
334	{	631	{
335	double block;	632	double block;
336	ev_loop_done = flags & EVLOOP_ONESHOT;	633	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
337		634
338	do	635	do
339	{	636	{
		637	/* queue check watchers (and execute them) */
		638	if (preparecnt)
		639	{
		640	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		641	call_pending ();
		642	}
		643
340	/* update fd-related kernel structures */	644	/* update fd-related kernel structures */
341	method_reify (); fdchangecnt = 0;	645	fd_reify ();
342		646
343	/* calculate blocking time */	647	/* calculate blocking time */
		648
		649	/* we only need this for !monotonic clockor timers, but as we basically
		650	always have timers, we just calculate it always */
		651	ev_now = ev_time ();
		652
344	if (flags & EVLOOP_NONBLOCK)	653	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
345	block = 0.;	654	block = 0.;
346	else	655	else
347	{	656	{
348	block = MAX_BLOCKTIME;	657	block = MAX_BLOCKTIME;
349		658
350	if (rtimercnt)	659	if (timercnt)
351	{	660	{
352	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	661	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
353	if (block > to) block = to;	662	if (block > to) block = to;
354	}	663	}
355		664
356	if (atimercnt)	665	if (periodiccnt)
357	{	666	{
358	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	667	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
359	if (block > to) block = to;	668	if (block > to) block = to;
360	}	669	}
361		670
362	if (block < 0.) block = 0.;	671	if (block < 0.) block = 0.;
363	}	672	}
…		…
365	method_poll (block);	674	method_poll (block);
366		675
367	/* update ev_now, do magic */	676	/* update ev_now, do magic */
368	time_update ();	677	time_update ();
369		678
370	/* put pending timers into pendign queue and reschedule them */	679	/* queue pending timers and reschedule them */
371	/* absolute timers first */	680	timers_reify (); /* relative timers called last */
372	timers_reify (atimers, atimercnt, ev_now);	681	periodics_reify (); /* absolute timers called first */
373	/* relative timers second */	682
374	timers_reify (rtimers, rtimercnt, now);	683	/* queue idle watchers unless io or timers are pending */
		684	if (!pendingcnt)
		685	queue_events ((W *)idles, idlecnt, EV_IDLE);
		686
		687	/* queue check watchers, to be executed first */
		688	if (checkcnt)
		689	queue_events ((W *)checks, checkcnt, EV_CHECK);
375		690
376	call_pending ();	691	call_pending ();
377	}	692	}
378	while (!ev_loop_done);	693	while (!ev_loop_done);
379	}
380		694
		695	if (ev_loop_done != 2)
		696	ev_loop_done = 0;
		697	}
		698
		699	/*****************************************************************************/
		700
381	static void	701	static void
382	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	702	wlist_add (WL *head, WL elem)
383	{	703	{
384	elem->next = *head;	704	elem->next = *head;
385	*head = elem;	705	*head = elem;
386	}	706	}
387		707
388	static void	708	static void
389	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	709	wlist_del (WL *head, WL elem)
390	{	710	{
391	while (*head)	711	while (*head)
392	{	712	{
393	if (*head == elem)	713	if (*head == elem)
394	{	714	{
…		…
399	head = &(*head)->next;	719	head = &(*head)->next;
400	}	720	}
401	}	721	}
402		722
403	static void	723	static void
404	ev_start (struct ev_watcher *w, int active)	724	ev_clear (W w)
405	{	725	{
		726	if (w->pending)
		727	{
		728	pendings [w->pending - 1].w = 0;
406	w->pending = 0;	729	w->pending = 0;
		730	}
		731	}
		732
		733	static void
		734	ev_start (W w, int active)
		735	{
407	w->active = active;	736	w->active = active;
408	}	737	}
409		738
410	static void	739	static void
411	ev_stop (struct ev_watcher *w)	740	ev_stop (W w)
412	{	741	{
413	if (w->pending)
414	pendings [w->pending - 1].w = 0;
415
416	w->active = 0;	742	w->active = 0;
417	/* nop */
418	}	743	}
		744
		745	/*****************************************************************************/
419		746
420	void	747	void
421	evio_start (struct ev_io *w)	748	evio_start (struct ev_io *w)
422	{	749	{
423	if (ev_is_active (w))	750	if (ev_is_active (w))
424	return;	751	return;
425		752
426	int fd = w->fd;	753	int fd = w->fd;
427		754
428	ev_start ((struct ev_watcher *)w, 1);	755	ev_start ((W)w, 1);
429	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	756	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
430	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	757	wlist_add ((WL *)&anfds[fd].head, (WL)w);
431		758
432	++fdchangecnt;	759	fd_change (fd);
433	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
434	fdchanges [fdchangecnt - 1] = fd;
435	}	760	}
436		761
437	void	762	void
438	evio_stop (struct ev_io *w)	763	evio_stop (struct ev_io *w)
439	{	764	{
		765	ev_clear ((W)w);
440	if (!ev_is_active (w))	766	if (!ev_is_active (w))
441	return;	767	return;
442		768
443	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	769	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
444	ev_stop ((struct ev_watcher *)w);	770	ev_stop ((W)w);
445		771
446	++fdchangecnt;	772	fd_change (w->fd);
447	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
448	fdchanges [fdchangecnt - 1] = w->fd;
449	}	773	}
450		774
451	void	775	void
452	evtimer_start (struct ev_timer *w)	776	evtimer_start (struct ev_timer *w)
453	{	777	{
454	if (ev_is_active (w))	778	if (ev_is_active (w))
455	return;	779	return;
456		780
457	if (w->is_abs)	781	w->at += now;
		782
		783	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
		784
		785	ev_start ((W)w, ++timercnt);
		786	array_needsize (timers, timermax, timercnt, );
		787	timers [timercnt - 1] = w;
		788	upheap ((WT *)timers, timercnt - 1);
		789	}
		790
		791	void
		792	evtimer_stop (struct ev_timer *w)
		793	{
		794	ev_clear ((W)w);
		795	if (!ev_is_active (w))
		796	return;
		797
		798	if (w->active < timercnt--)
		799	{
		800	timers [w->active - 1] = timers [timercnt];
		801	downheap ((WT *)timers, timercnt, w->active - 1);
458	{	802	}
459	/* this formula differs from the one in timer_reify becuse we do not round up */	803
		804	w->at = w->repeat;
		805
		806	ev_stop ((W)w);
		807	}
		808
		809	void
		810	evtimer_again (struct ev_timer *w)
		811	{
		812	if (ev_is_active (w))
		813	{
460	if (w->repeat)	814	if (w->repeat)
		815	{
		816	w->at = now + w->repeat;
		817	downheap ((WT *)timers, timercnt, w->active - 1);
		818	}
		819	else
		820	evtimer_stop (w);
		821	}
		822	else if (w->repeat)
		823	evtimer_start (w);
		824	}
		825
		826	void
		827	evperiodic_start (struct ev_periodic *w)
		828	{
		829	if (ev_is_active (w))
		830	return;
		831
		832	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
		833
		834	/* this formula differs from the one in periodic_reify because we do not always round up */
		835	if (w->interval)
461	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	836	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
462		837
463	ev_start ((struct ev_watcher *)w, ++atimercnt);	838	ev_start ((W)w, ++periodiccnt);
464	array_needsize (atimers, atimermax, atimercnt, );	839	array_needsize (periodics, periodicmax, periodiccnt, );
465	atimers [atimercnt - 1] = w;	840	periodics [periodiccnt - 1] = w;
466	upheap (atimers, atimercnt - 1);	841	upheap ((WT *)periodics, periodiccnt - 1);
		842	}
		843
		844	void
		845	evperiodic_stop (struct ev_periodic *w)
		846	{
		847	ev_clear ((W)w);
		848	if (!ev_is_active (w))
		849	return;
		850
		851	if (w->active < periodiccnt--)
467	}	852	{
		853	periodics [w->active - 1] = periodics [periodiccnt];
		854	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		855	}
		856
		857	ev_stop ((W)w);
		858	}
		859
		860	void
		861	evsignal_start (struct ev_signal *w)
		862	{
		863	if (ev_is_active (w))
		864	return;
		865
		866	ev_start ((W)w, 1);
		867	array_needsize (signals, signalmax, w->signum, signals_init);
		868	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		869
		870	if (!w->next)
		871	{
		872	struct sigaction sa;
		873	sa.sa_handler = sighandler;
		874	sigfillset (&sa.sa_mask);
		875	sa.sa_flags = 0;
		876	sigaction (w->signum, &sa, 0);
		877	}
		878	}
		879
		880	void
		881	evsignal_stop (struct ev_signal *w)
		882	{
		883	ev_clear ((W)w);
		884	if (!ev_is_active (w))
		885	return;
		886
		887	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		888	ev_stop ((W)w);
		889
		890	if (!signals [w->signum - 1].head)
		891	signal (w->signum, SIG_DFL);
		892	}
		893
		894	void evidle_start (struct ev_idle *w)
		895	{
		896	if (ev_is_active (w))
		897	return;
		898
		899	ev_start ((W)w, ++idlecnt);
		900	array_needsize (idles, idlemax, idlecnt, );
		901	idles [idlecnt - 1] = w;
		902	}
		903
		904	void evidle_stop (struct ev_idle *w)
		905	{
		906	ev_clear ((W)w);
		907	if (ev_is_active (w))
		908	return;
		909
		910	idles [w->active - 1] = idles [--idlecnt];
		911	ev_stop ((W)w);
		912	}
		913
		914	void evprepare_start (struct ev_prepare *w)
		915	{
		916	if (ev_is_active (w))
		917	return;
		918
		919	ev_start ((W)w, ++preparecnt);
		920	array_needsize (prepares, preparemax, preparecnt, );
		921	prepares [preparecnt - 1] = w;
		922	}
		923
		924	void evprepare_stop (struct ev_prepare *w)
		925	{
		926	ev_clear ((W)w);
		927	if (ev_is_active (w))
		928	return;
		929
		930	prepares [w->active - 1] = prepares [--preparecnt];
		931	ev_stop ((W)w);
		932	}
		933
		934	void evcheck_start (struct ev_check *w)
		935	{
		936	if (ev_is_active (w))
		937	return;
		938
		939	ev_start ((W)w, ++checkcnt);
		940	array_needsize (checks, checkmax, checkcnt, );
		941	checks [checkcnt - 1] = w;
		942	}
		943
		944	void evcheck_stop (struct ev_check *w)
		945	{
		946	ev_clear ((W)w);
		947	if (ev_is_active (w))
		948	return;
		949
		950	checks [w->active - 1] = checks [--checkcnt];
		951	ev_stop ((W)w);
		952	}
		953
		954	void evchild_start (struct ev_child *w)
		955	{
		956	if (ev_is_active (w))
		957	return;
		958
		959	ev_start ((W)w, 1);
		960	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		961	}
		962
		963	void evchild_stop (struct ev_child *w)
		964	{
		965	ev_clear ((W)w);
		966	if (ev_is_active (w))
		967	return;
		968
		969	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		970	ev_stop ((W)w);
		971	}
		972
		973	/*****************************************************************************/
		974
		975	struct ev_once
		976	{
		977	struct ev_io io;
		978	struct ev_timer to;
		979	void (cb)(int revents, void arg);
		980	void *arg;
		981	};
		982
		983	static void
		984	once_cb (struct ev_once *once, int revents)
		985	{
		986	void (cb)(int revents, void arg) = once->cb;
		987	void *arg = once->arg;
		988
		989	evio_stop (&once->io);
		990	evtimer_stop (&once->to);
		991	free (once);
		992
		993	cb (revents, arg);
		994	}
		995
		996	static void
		997	once_cb_io (struct ev_io *w, int revents)
		998	{
		999	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1000	}
		1001
		1002	static void
		1003	once_cb_to (struct ev_timer *w, int revents)
		1004	{
		1005	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1006	}
		1007
		1008	void
		1009	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1010	{
		1011	struct ev_once *once = malloc (sizeof (struct ev_once));
		1012
		1013	if (!once)
		1014	cb (EV_ERROR, arg);
468	else	1015	else
469	{	1016	{
470	w->at += now;	1017	once->cb = cb;
		1018	once->arg = arg;
471		1019
472	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1020	evw_init (&once->io, once_cb_io);
473	array_needsize (rtimers, rtimermax, rtimercnt, );
474	rtimers [rtimercnt - 1] = w;
475	upheap (rtimers, rtimercnt - 1);
476	}
477		1021
478	}	1022	if (fd >= 0)
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	}	1023	{
493	}	1024	evio_set (&once->io, fd, events);
494	else	1025	evio_start (&once->io);
495	{
496	if (w->active < rtimercnt--)
497	{	1026	}
498	rtimers [w->active - 1] = rtimers [rtimercnt];	1027
499	downheap (rtimers, rtimercnt, w->active - 1);	1028	evw_init (&once->to, once_cb_to);
		1029
		1030	if (timeout >= 0.)
500	}	1031	{
		1032	evtimer_set (&once->to, timeout, 0.);
		1033	evtimer_start (&once->to);
		1034	}
501	}	1035	}
502
503	ev_stop ((struct ev_watcher *)w);
504	}	1036	}
505		1037
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	/*****************************************************************************/	1038	/*****************************************************************************/
		1039
528	#if 1	1040	#if 0
		1041
		1042	struct ev_io wio;
529		1043
530	static void	1044	static void
531	sin_cb (struct ev_io *w, int revents)	1045	sin_cb (struct ev_io *w, int revents)
532	{	1046	{
533	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1047	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
539	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1053	//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);	1054	evtimer_stop (w);
541	evtimer_start (w);	1055	evtimer_start (w);
542	}	1056	}
543		1057
		1058	static void
		1059	scb (struct ev_signal *w, int revents)
		1060	{
		1061	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1062	evio_stop (&wio);
		1063	evio_start (&wio);
		1064	}
		1065
		1066	static void
		1067	gcb (struct ev_signal *w, int revents)
		1068	{
		1069	fprintf (stderr, "generic %x\n", revents);
		1070
		1071	}
		1072
544	int main (void)	1073	int main (void)
545	{	1074	{
546	struct ev_io sin;
547
548	ev_init (0);	1075	ev_init (0);
549		1076
550	evw_init (&sin, sin_cb, 55);
551	evio_set (&sin, 0, EV_READ);	1077	evio_init (&wio, sin_cb, 0, EV_READ);
552	evio_start (&sin);	1078	evio_start (&wio);
553		1079
554	struct ev_timer t[10000];	1080	struct ev_timer t[10000];
555		1081
556	#if 1	1082	#if 0
557	int i;	1083	int i;
558	for (i = 0; i < 10000; ++i)	1084	for (i = 0; i < 10000; ++i)
559	{	1085	{
560	struct ev_timer *w = t + i;	1086	struct ev_timer *w = t + i;
561	evw_init (w, ocb, i);	1087	evw_init (w, ocb, i);
562	evtimer_set_abs (w, drand48 (), 0.99775533);	1088	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
563	evtimer_start (w);	1089	evtimer_start (w);
564	if (drand48 () < 0.5)	1090	if (drand48 () < 0.5)
565	evtimer_stop (w);	1091	evtimer_stop (w);
566	}	1092	}
567	#endif	1093	#endif
568		1094
569	struct ev_timer t1;	1095	struct ev_timer t1;
570	evw_init (&t1, ocb, 0);	1096	evtimer_init (&t1, ocb, 5, 10);
571	evtimer_set_abs (&t1, 5, 10);
572	evtimer_start (&t1);	1097	evtimer_start (&t1);
573		1098
		1099	struct ev_signal sig;
		1100	evsignal_init (&sig, scb, SIGQUIT);
		1101	evsignal_start (&sig);
		1102
		1103	struct ev_check cw;
		1104	evcheck_init (&cw, gcb);
		1105	evcheck_start (&cw);
		1106
		1107	struct ev_idle iw;
		1108	evidle_init (&iw, gcb);
		1109	evidle_start (&iw);
		1110
574	ev_loop (0);	1111	ev_loop (0);
575		1112
576	return 0;	1113	return 0;
577	}	1114	}
578		1115

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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 1.27 by root, Wed Oct 31 22:16:36 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 1.27 by root, Wed Oct 31 22:16:36 2007 UTC