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

Comparing libev/ev.c (file contents):
Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs.
Revision 1.26 by root, Wed Oct 31 21:50:15 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_REALTIME 1	52	#ifndef HAVE_SELECT
16	#define HAVE_EPOLL 1
17	#define HAVE_SELECT 1	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_modify)(int fd, int oev, int nev);	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	unsigned char wev, rev; /* want, received event set */
85	} ANFD;	136	} ANFD;
…		…
101	}	152	}
102	}	153	}
103		154
104	typedef struct	155	typedef struct
105	{	156	{
106	struct ev_watcher *w;	157	W w;
107	int events;	158	int events;
108	} ANPENDING;	159	} ANPENDING;
109		160
110	static ANPENDING *pendings;	161	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;	162	static int pendingmax, pendingcnt;
112		163
113	static void	164	static void
114	event (struct ev_watcher *w, int events)	165	event (W w, int events)
115	{	166	{
		167	if (w->active)
		168	{
116	w->pending = ++pendingcnt;	169	w->pending = ++pendingcnt;
117	array_needsize (pendings, pendingmax, pendingcnt, );	170	array_needsize (pendings, pendingmax, pendingcnt, );
118	pendings [pendingcnt - 1].w = w;	171	pendings [pendingcnt - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	172	pendings [pendingcnt - 1].events = events;
		173	}
120	}	174	}
121		175
122	static void	176	static void
123	fd_event (int fd, int events)	177	fd_event (int fd, int events)
124	{	178	{
…		…
128	for (w = anfd->head; w; w = w->next)	182	for (w = anfd->head; w; w = w->next)
129	{	183	{
130	int ev = w->events & events;	184	int ev = w->events & events;
131		185
132	if (ev)	186	if (ev)
133	event ((struct ev_watcher *)w, ev);	187	event ((W)w, ev);
134	}	188	}
135	}	189	}
136		190
		191	static void
		192	queue_events (W *events, int eventcnt, int type)
		193	{
		194	int i;
		195
		196	for (i = 0; i < eventcnt; ++i)
		197	event (events [i], type);
		198	}
		199
		200	/* called on EBADF to verify fds */
		201	static void
		202	fd_recheck (void)
		203	{
		204	int fd;
		205
		206	for (fd = 0; fd < anfdmax; ++fd)
		207	if (anfds [fd].wev)
		208	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		209	while (anfds [fd].head)
		210	{
		211	event ((W)anfds [fd].head, EV_ERROR);
		212	evio_stop (anfds [fd].head);
		213	}
		214	}
		215
		216	/*****************************************************************************/
		217
137	static struct ev_timer **atimers;	218	static struct ev_timer **timers;
138	static int atimermax, atimercnt;	219	static int timermax, timercnt;
139		220
140	static struct ev_timer **rtimers;	221	static struct ev_periodic **periodics;
141	static int rtimermax, rtimercnt;	222	static int periodicmax, periodiccnt;
142		223
143	static void	224	static void
144	upheap (struct ev_timer **timers, int k)	225	upheap (WT *timers, int k)
145	{	226	{
146	struct ev_timer *w = timers [k];	227	WT w = timers [k];
147		228
148	while (k && timers [k >> 1]->at > w->at)	229	while (k && timers [k >> 1]->at > w->at)
149	{	230	{
150	timers [k] = timers [k >> 1];	231	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;	232	timers [k]->active = k + 1;
…		…
156	timers [k]->active = k + 1;	237	timers [k]->active = k + 1;
157		238
158	}	239	}
159		240
160	static void	241	static void
161	downheap (struct ev_timer **timers, int N, int k)	242	downheap (WT *timers, int N, int k)
162	{	243	{
163	struct ev_timer *w = timers [k];	244	WT w = timers [k];
164		245
165	while (k < (N >> 1))	246	while (k < (N >> 1))
166	{	247	{
167	int j = k << 1;	248	int j = k << 1;
168		249
…		…
179		260
180	timers [k] = w;	261	timers [k] = w;
181	timers [k]->active = k + 1;	262	timers [k]->active = k + 1;
182	}	263	}
183		264
184	static struct ev_signal **signals;	265	/*****************************************************************************/
		266
		267	typedef struct
		268	{
		269	struct ev_signal *head;
		270	sig_atomic_t gotsig;
		271	} ANSIG;
		272
		273	static ANSIG *signals;
185	static int signalmax;	274	static int signalmax;
186		275
		276	static int sigpipe [2];
		277	static sig_atomic_t gotsig;
		278	static struct ev_io sigev;
		279
187	static void	280	static void
188	signals_init (struct ev_signal **base, int count)	281	signals_init (ANSIG *base, int count)
189	{	282	{
190	while (count--)	283	while (count--)
191	*base++ = 0;	284	{
		285	base->head = 0;
		286	base->gotsig = 0;
		287	++base;
		288	}
192	}	289	}
		290
		291	static void
		292	sighandler (int signum)
		293	{
		294	signals [signum - 1].gotsig = 1;
		295
		296	if (!gotsig)
		297	{
		298	gotsig = 1;
		299	write (sigpipe [1], &gotsig, 1);
		300	}
		301	}
		302
		303	static void
		304	sigcb (struct ev_io *iow, int revents)
		305	{
		306	struct ev_signal *w;
		307	int sig;
		308
		309	gotsig = 0;
		310	read (sigpipe [0], &revents, 1);
		311
		312	for (sig = signalmax; sig--; )
		313	if (signals [sig].gotsig)
		314	{
		315	signals [sig].gotsig = 0;
		316
		317	for (w = signals [sig].head; w; w = w->next)
		318	event ((W)w, EV_SIGNAL);
		319	}
		320	}
		321
		322	static void
		323	siginit (void)
		324	{
		325	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		326	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		327
		328	/* rather than sort out wether we really need nb, set it */
		329	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		330	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		331
		332	evio_set (&sigev, sigpipe [0], EV_READ);
		333	evio_start (&sigev);
		334	}
		335
		336	/*****************************************************************************/
		337
		338	static struct ev_idle **idles;
		339	static int idlemax, idlecnt;
		340
		341	static struct ev_prepare **prepares;
		342	static int preparemax, preparecnt;
		343
		344	static struct ev_check **checks;
		345	static int checkmax, checkcnt;
		346
		347	/*****************************************************************************/
		348
		349	static struct ev_child *childs [PID_HASHSIZE];
		350	static struct ev_signal childev;
		351
		352	#ifndef WCONTINUED
		353	# define WCONTINUED 0
		354	#endif
		355
		356	static void
		357	childcb (struct ev_signal *sw, int revents)
		358	{
		359	struct ev_child *w;
		360	int pid, status;
		361
		362	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		363	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		364	if (w->pid == pid \|\| w->pid == -1)
		365	{
		366	w->status = status;
		367	event ((W)w, EV_CHILD);
		368	}
		369	}
		370
		371	/*****************************************************************************/
193		372
194	#if HAVE_EPOLL	373	#if HAVE_EPOLL
195	# include "ev_epoll.c"	374	# include "ev_epoll.c"
196	#endif	375	#endif
197	#if HAVE_SELECT	376	#if HAVE_SELECT
198	# include "ev_select.c"	377	# include "ev_select.c"
199	#endif	378	#endif
200		379
		380	int
		381	ev_version_major (void)
		382	{
		383	return EV_VERSION_MAJOR;
		384	}
		385
		386	int
		387	ev_version_minor (void)
		388	{
		389	return EV_VERSION_MINOR;
		390	}
		391
201	int ev_init (int flags)	392	int ev_init (int flags)
202	{	393	{
		394	if (!ev_method)
		395	{
203	#if HAVE_MONOTONIC	396	#if HAVE_MONOTONIC
204	{	397	{
205	struct timespec ts;	398	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	399	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	400	have_monotonic = 1;
208	}	401	}
209	#endif	402	#endif
210		403
211	ev_now = ev_time ();	404	ev_now = ev_time ();
212	now = get_clock ();	405	now = get_clock ();
213	diff = ev_now - now;	406	diff = ev_now - now;
214		407
		408	if (pipe (sigpipe))
		409	return 0;
		410
		411	ev_method = EVMETHOD_NONE;
215	#if HAVE_EPOLL	412	#if HAVE_EPOLL
216	if (epoll_init (flags))	413	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
217	return ev_method;
218	#endif	414	#endif
219	#if HAVE_SELECT	415	#if HAVE_SELECT
220	if (select_init (flags))	416	if (ev_method == EVMETHOD_NONE) select_init (flags);
221	return ev_method;
222	#endif	417	#endif
223		418
224	ev_method = EVMETHOD_NONE;	419	if (ev_method)
		420	{
		421	evw_init (&sigev, sigcb);
		422	siginit ();
		423
		424	evsignal_init (&childev, childcb, SIGCHLD);
		425	evsignal_start (&childev);
		426	}
		427	}
		428
225	return ev_method;	429	return ev_method;
226	}	430	}
227		431
		432	/*****************************************************************************/
		433
		434	void
228	void ev_prefork (void)	435	ev_prefork (void)
229	{	436	{
		437	/* nop */
230	}	438	}
231		439
		440	void
232	void ev_postfork_parent (void)	441	ev_postfork_parent (void)
233	{	442	{
		443	/* nop */
234	}	444	}
235		445
		446	void
236	void ev_postfork_child (void)	447	ev_postfork_child (void)
237	{	448	{
238	#if HAVE_EPOLL	449	#if HAVE_EPOLL
239	if (ev_method == EVMETHOD_EPOLL)	450	if (ev_method == EVMETHOD_EPOLL)
240	epoll_postfork_child ();	451	epoll_postfork_child ();
241	#endif	452	#endif
		453
		454	evio_stop (&sigev);
		455	close (sigpipe [0]);
		456	close (sigpipe [1]);
		457	pipe (sigpipe);
		458	siginit ();
242	}	459	}
		460
		461	/*****************************************************************************/
243		462
244	static void	463	static void
245	fd_reify (void)	464	fd_reify (void)
246	{	465	{
247	int i;	466	int i;
…		…
266		485
267	fdchangecnt = 0;	486	fdchangecnt = 0;
268	}	487	}
269		488
270	static void	489	static void
271	call_pending ()	490	call_pending (void)
272	{	491	{
273	int i;	492	while (pendingcnt)
274
275	for (i = 0; i < pendingcnt; ++i)
276	{	493	{
277	ANPENDING *p = pendings + i;	494	ANPENDING *p = pendings + --pendingcnt;
278		495
279	if (p->w)	496	if (p->w)
280	{	497	{
281	p->w->pending = 0;	498	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	499	p->w->cb (p->w, p->events);
283	}	500	}
284	}	501	}
285
286	pendingcnt = 0;
287	}	502	}
288		503
289	static void	504	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	505	timers_reify (void)
291	{	506	{
292	while (timercnt && timers [0]->at <= now)	507	while (timercnt && timers [0]->at <= now)
293	{	508	{
294	struct ev_timer *w = timers [0];	509	struct ev_timer *w = timers [0];
		510
		511	event ((W)w, EV_TIMEOUT);
295		512
296	/* first reschedule or stop timer */	513	/* first reschedule or stop timer */
297	if (w->repeat)	514	if (w->repeat)
298	{	515	{
299	if (w->is_abs)
300	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
301	else
302	w->at = now + w->repeat;	516	w->at = now + w->repeat;
303		517	assert (("timer timeout in the past, negative repeat?", w->at > now));
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	518	downheap ((WT *)timers, timercnt, 0);
307	}	519	}
308	else	520	else
309	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	521	evtimer_stop (w); /* nonrepeating: stop timer */
311	--timercnt; /* maybe pass by reference instead? */	522	}
		523	}
		524
		525	static void
		526	periodics_reify (void)
		527	{
		528	while (periodiccnt && periodics [0]->at <= ev_now)
		529	{
		530	struct ev_periodic *w = periodics [0];
		531
		532	/* first reschedule or stop timer */
		533	if (w->interval)
312	}	534	{
		535	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		536	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
		537	downheap ((WT *)periodics, periodiccnt, 0);
		538	}
		539	else
		540	evperiodic_stop (w); /* nonrepeating: stop timer */
313		541
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	542	event ((W)w, EV_TIMEOUT);
315	}	543	}
316	}	544	}
317		545
318	static void	546	static void
319	time_update ()	547	periodics_reschedule (ev_tstamp diff)
320	{	548	{
321	int i;	549	int i;
		550
		551	/* adjust periodics after time jump */
		552	for (i = 0; i < periodiccnt; ++i)
		553	{
		554	struct ev_periodic *w = periodics [i];
		555
		556	if (w->interval)
		557	{
		558	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		559
		560	if (fabs (diff) >= 1e-4)
		561	{
		562	evperiodic_stop (w);
		563	evperiodic_start (w);
		564
		565	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		566	}
		567	}
		568	}
		569	}
		570
		571	static void
		572	time_update (void)
		573	{
		574	int i;
		575
322	ev_now = ev_time ();	576	ev_now = ev_time ();
323		577
324	if (have_monotonic)	578	if (have_monotonic)
325	{	579	{
326	ev_tstamp odiff = diff;	580	ev_tstamp odiff = diff;
327		581
328	/* detecting time jumps is much more difficult */
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	582	for (i = 4; --i; ) /* loop a few times, before making important decisions */
330	{	583	{
331	now = get_clock ();	584	now = get_clock ();
332	diff = ev_now - now;	585	diff = ev_now - now;
333		586
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	587	if (fabs (odiff - diff) < MIN_TIMEJUMP)
335	return; /* all is well */	588	return; /* all is well */
336		589
337	ev_now = ev_time ();	590	ev_now = ev_time ();
338	}	591	}
339		592
340	/* time jump detected, reschedule atimers */	593	periodics_reschedule (diff - odiff);
341	for (i = 0; i < atimercnt; ++i)	594	/* no timer adjustment, as the monotonic clock doesn't jump */
342	{
343	struct ev_timer *w = atimers [i];
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
345	}
346	}	595	}
347	else	596	else
348	{	597	{
349	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	598	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
350	/* time jump detected, adjust rtimers */	599	{
		600	periodics_reschedule (ev_now - now);
		601
		602	/* adjust timers. this is easy, as the offset is the same for all */
351	for (i = 0; i < rtimercnt; ++i)	603	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	604	timers [i]->at += diff;
		605	}
353		606
354	now = ev_now;	607	now = ev_now;
355	}	608	}
356	}	609	}
357		610
358	int ev_loop_done;	611	int ev_loop_done;
359		612
360	void ev_loop (int flags)	613	void ev_loop (int flags)
361	{	614	{
362	double block;	615	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	616	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
364		617
365	do	618	do
366	{	619	{
		620	/* queue check watchers (and execute them) */
		621	if (preparecnt)
		622	{
		623	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		624	call_pending ();
		625	}
		626
367	/* update fd-related kernel structures */	627	/* update fd-related kernel structures */
368	fd_reify ();	628	fd_reify ();
369		629
370	/* calculate blocking time */	630	/* calculate blocking time */
		631
		632	/* we only need this for !monotonic clockor timers, but as we basically
		633	always have timers, we just calculate it always */
		634	ev_now = ev_time ();
		635
371	if (flags & EVLOOP_NONBLOCK)	636	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
372	block = 0.;	637	block = 0.;
373	else	638	else
374	{	639	{
375	block = MAX_BLOCKTIME;	640	block = MAX_BLOCKTIME;
376		641
377	if (rtimercnt)	642	if (timercnt)
378	{	643	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	644	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
380	if (block > to) block = to;	645	if (block > to) block = to;
381	}	646	}
382		647
383	if (atimercnt)	648	if (periodiccnt)
384	{	649	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	650	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
386	if (block > to) block = to;	651	if (block > to) block = to;
387	}	652	}
388		653
389	if (block < 0.) block = 0.;	654	if (block < 0.) block = 0.;
390	}	655	}
…		…
392	method_poll (block);	657	method_poll (block);
393		658
394	/* update ev_now, do magic */	659	/* update ev_now, do magic */
395	time_update ();	660	time_update ();
396		661
397	/* put pending timers into pendign queue and reschedule them */	662	/* queue pending timers and reschedule them */
398	/* absolute timers first */	663	timers_reify (); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	664	periodics_reify (); /* absolute timers called first */
400	/* relative timers second */	665
401	timers_reify (rtimers, rtimercnt, now);	666	/* queue idle watchers unless io or timers are pending */
		667	if (!pendingcnt)
		668	queue_events ((W *)idles, idlecnt, EV_IDLE);
		669
		670	/* queue check watchers, to be executed first */
		671	if (checkcnt)
		672	queue_events ((W *)checks, checkcnt, EV_CHECK);
402		673
403	call_pending ();	674	call_pending ();
404	}	675	}
405	while (!ev_loop_done);	676	while (!ev_loop_done);
406	}
407		677
		678	if (ev_loop_done != 2)
		679	ev_loop_done = 0;
		680	}
		681
		682	/*****************************************************************************/
		683
408	static void	684	static void
409	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	685	wlist_add (WL *head, WL elem)
410	{	686	{
411	elem->next = *head;	687	elem->next = *head;
412	*head = elem;	688	*head = elem;
413	}	689	}
414		690
415	static void	691	static void
416	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	692	wlist_del (WL *head, WL elem)
417	{	693	{
418	while (*head)	694	while (*head)
419	{	695	{
420	if (*head == elem)	696	if (*head == elem)
421	{	697	{
…		…
426	head = &(*head)->next;	702	head = &(*head)->next;
427	}	703	}
428	}	704	}
429		705
430	static void	706	static void
431	ev_start (struct ev_watcher *w, int active)	707	ev_clear (W w)
432	{	708	{
		709	if (w->pending)
		710	{
		711	pendings [w->pending - 1].w = 0;
433	w->pending = 0;	712	w->pending = 0;
		713	}
		714	}
		715
		716	static void
		717	ev_start (W w, int active)
		718	{
434	w->active = active;	719	w->active = active;
435	}	720	}
436		721
437	static void	722	static void
438	ev_stop (struct ev_watcher *w)	723	ev_stop (W w)
439	{	724	{
440	if (w->pending)
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	725	w->active = 0;
444	/* nop */
445	}	726	}
		727
		728	/*****************************************************************************/
446		729
447	void	730	void
448	evio_start (struct ev_io *w)	731	evio_start (struct ev_io *w)
449	{	732	{
450	if (ev_is_active (w))	733	if (ev_is_active (w))
451	return;	734	return;
452		735
453	int fd = w->fd;	736	int fd = w->fd;
454		737
455	ev_start ((struct ev_watcher *)w, 1);	738	ev_start ((W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	739	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	740	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		741
459	++fdchangecnt;	742	++fdchangecnt;
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	743	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;	744	fdchanges [fdchangecnt - 1] = fd;
		745
		746	if (w->fd == 9)
		747	printf ("start %p:%x\n", w, w->events);//D
462	}	748	}
463		749
464	void	750	void
465	evio_stop (struct ev_io *w)	751	evio_stop (struct ev_io *w)
466	{	752	{
		753	if (w->fd == 9)
		754	printf ("stop %p:%x\n", w, w->events);//D
		755	ev_clear ((W)w);
467	if (!ev_is_active (w))	756	if (!ev_is_active (w))
468	return;	757	return;
469		758
470	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	759	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	760	ev_stop ((W)w);
472		761
473	++fdchangecnt;	762	++fdchangecnt;
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	763	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;	764	fdchanges [fdchangecnt - 1] = w->fd;
476	}	765	}
…		…
479	evtimer_start (struct ev_timer *w)	768	evtimer_start (struct ev_timer *w)
480	{	769	{
481	if (ev_is_active (w))	770	if (ev_is_active (w))
482	return;	771	return;
483		772
484	if (w->is_abs)	773	w->at += now;
		774
		775	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
		776
		777	ev_start ((W)w, ++timercnt);
		778	array_needsize (timers, timermax, timercnt, );
		779	timers [timercnt - 1] = w;
		780	upheap ((WT *)timers, timercnt - 1);
		781	}
		782
		783	void
		784	evtimer_stop (struct ev_timer *w)
		785	{
		786	ev_clear ((W)w);
		787	if (!ev_is_active (w))
		788	return;
		789
		790	if (w->active < timercnt--)
		791	{
		792	timers [w->active - 1] = timers [timercnt];
		793	downheap ((WT *)timers, timercnt, w->active - 1);
485	{	794	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	795
		796	w->at = w->repeat;
		797
		798	ev_stop ((W)w);
		799	}
		800
		801	void
		802	evtimer_again (struct ev_timer *w)
		803	{
		804	if (ev_is_active (w))
		805	{
487	if (w->repeat)	806	if (w->repeat)
		807	{
		808	w->at = now + w->repeat;
		809	downheap ((WT *)timers, timercnt, w->active - 1);
		810	}
		811	else
		812	evtimer_stop (w);
		813	}
		814	else if (w->repeat)
		815	evtimer_start (w);
		816	}
		817
		818	void
		819	evperiodic_start (struct ev_periodic *w)
		820	{
		821	if (ev_is_active (w))
		822	return;
		823
		824	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
		825
		826	/* this formula differs from the one in periodic_reify because we do not always round up */
		827	if (w->interval)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	828	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
489		829
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	830	ev_start ((W)w, ++periodiccnt);
491	array_needsize (atimers, atimermax, atimercnt, );	831	array_needsize (periodics, periodicmax, periodiccnt, );
492	atimers [atimercnt - 1] = w;	832	periodics [periodiccnt - 1] = w;
493	upheap (atimers, atimercnt - 1);	833	upheap ((WT *)periodics, periodiccnt - 1);
		834	}
		835
		836	void
		837	evperiodic_stop (struct ev_periodic *w)
		838	{
		839	ev_clear ((W)w);
		840	if (!ev_is_active (w))
		841	return;
		842
		843	if (w->active < periodiccnt--)
494	}	844	{
		845	periodics [w->active - 1] = periodics [periodiccnt];
		846	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		847	}
		848
		849	ev_stop ((W)w);
		850	}
		851
		852	void
		853	evsignal_start (struct ev_signal *w)
		854	{
		855	if (ev_is_active (w))
		856	return;
		857
		858	ev_start ((W)w, 1);
		859	array_needsize (signals, signalmax, w->signum, signals_init);
		860	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		861
		862	if (!w->next)
		863	{
		864	struct sigaction sa;
		865	sa.sa_handler = sighandler;
		866	sigfillset (&sa.sa_mask);
		867	sa.sa_flags = 0;
		868	sigaction (w->signum, &sa, 0);
		869	}
		870	}
		871
		872	void
		873	evsignal_stop (struct ev_signal *w)
		874	{
		875	ev_clear ((W)w);
		876	if (!ev_is_active (w))
		877	return;
		878
		879	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		880	ev_stop ((W)w);
		881
		882	if (!signals [w->signum - 1].head)
		883	signal (w->signum, SIG_DFL);
		884	}
		885
		886	void evidle_start (struct ev_idle *w)
		887	{
		888	if (ev_is_active (w))
		889	return;
		890
		891	ev_start ((W)w, ++idlecnt);
		892	array_needsize (idles, idlemax, idlecnt, );
		893	idles [idlecnt - 1] = w;
		894	}
		895
		896	void evidle_stop (struct ev_idle *w)
		897	{
		898	ev_clear ((W)w);
		899	if (ev_is_active (w))
		900	return;
		901
		902	idles [w->active - 1] = idles [--idlecnt];
		903	ev_stop ((W)w);
		904	}
		905
		906	void evprepare_start (struct ev_prepare *w)
		907	{
		908	if (ev_is_active (w))
		909	return;
		910
		911	ev_start ((W)w, ++preparecnt);
		912	array_needsize (prepares, preparemax, preparecnt, );
		913	prepares [preparecnt - 1] = w;
		914	}
		915
		916	void evprepare_stop (struct ev_prepare *w)
		917	{
		918	ev_clear ((W)w);
		919	if (ev_is_active (w))
		920	return;
		921
		922	prepares [w->active - 1] = prepares [--preparecnt];
		923	ev_stop ((W)w);
		924	}
		925
		926	void evcheck_start (struct ev_check *w)
		927	{
		928	if (ev_is_active (w))
		929	return;
		930
		931	ev_start ((W)w, ++checkcnt);
		932	array_needsize (checks, checkmax, checkcnt, );
		933	checks [checkcnt - 1] = w;
		934	}
		935
		936	void evcheck_stop (struct ev_check *w)
		937	{
		938	ev_clear ((W)w);
		939	if (ev_is_active (w))
		940	return;
		941
		942	checks [w->active - 1] = checks [--checkcnt];
		943	ev_stop ((W)w);
		944	}
		945
		946	void evchild_start (struct ev_child *w)
		947	{
		948	if (ev_is_active (w))
		949	return;
		950
		951	ev_start ((W)w, 1);
		952	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		953	}
		954
		955	void evchild_stop (struct ev_child *w)
		956	{
		957	ev_clear ((W)w);
		958	if (ev_is_active (w))
		959	return;
		960
		961	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		962	ev_stop ((W)w);
		963	}
		964
		965	/*****************************************************************************/
		966
		967	struct ev_once
		968	{
		969	struct ev_io io;
		970	struct ev_timer to;
		971	void (cb)(int revents, void arg);
		972	void *arg;
		973	};
		974
		975	static void
		976	once_cb (struct ev_once *once, int revents)
		977	{
		978	void (cb)(int revents, void arg) = once->cb;
		979	void *arg = once->arg;
		980
		981	evio_stop (&once->io);
		982	evtimer_stop (&once->to);
		983	free (once);
		984
		985	cb (revents, arg);
		986	}
		987
		988	static void
		989	once_cb_io (struct ev_io *w, int revents)
		990	{
		991	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		992	}
		993
		994	static void
		995	once_cb_to (struct ev_timer *w, int revents)
		996	{
		997	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		998	}
		999
		1000	void
		1001	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1002	{
		1003	struct ev_once *once = malloc (sizeof (struct ev_once));
		1004
		1005	if (!once)
		1006	cb (EV_ERROR, arg);
495	else	1007	else
496	{	1008	{
497	w->at += now;	1009	once->cb = cb;
		1010	once->arg = arg;
498		1011
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1012	evw_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504		1013
505	}	1014	if (fd >= 0)
506
507	void
508	evtimer_stop (struct ev_timer *w)
509	{
510	if (!ev_is_active (w))
511	return;
512
513	if (w->is_abs)
514	{
515	if (w->active < atimercnt--)
516	{
517	atimers [w->active - 1] = atimers [atimercnt];
518	downheap (atimers, atimercnt, w->active - 1);
519	}	1015	{
520	}	1016	evio_set (&once->io, fd, events);
521	else	1017	evio_start (&once->io);
522	{
523	if (w->active < rtimercnt--)
524	{	1018	}
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1019
526	downheap (rtimers, rtimercnt, w->active - 1);	1020	evw_init (&once->to, once_cb_to);
		1021
		1022	if (timeout >= 0.)
527	}	1023	{
		1024	evtimer_set (&once->to, timeout, 0.);
		1025	evtimer_start (&once->to);
		1026	}
528	}	1027	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1028	}
532		1029
533	void
534	evsignal_start (struct ev_signal *w)
535	{
536	if (ev_is_active (w))
537	return;
538
539	ev_start ((struct ev_watcher *)w, 1);
540	array_needsize (signals, signalmax, w->signum, signals_init);
541	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
542	}
543
544	void
545	evsignal_stop (struct ev_signal *w)
546	{
547	if (!ev_is_active (w))
548	return;
549
550	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
551	ev_stop ((struct ev_watcher *)w);
552	}
553
554	/*****************************************************************************/	1030	/*****************************************************************************/
		1031
555	#if 1	1032	#if 0
		1033
		1034	struct ev_io wio;
556		1035
557	static void	1036	static void
558	sin_cb (struct ev_io *w, int revents)	1037	sin_cb (struct ev_io *w, int revents)
559	{	1038	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1039	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1045	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
567	evtimer_stop (w);	1046	evtimer_stop (w);
568	evtimer_start (w);	1047	evtimer_start (w);
569	}	1048	}
570		1049
		1050	static void
		1051	scb (struct ev_signal *w, int revents)
		1052	{
		1053	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1054	evio_stop (&wio);
		1055	evio_start (&wio);
		1056	}
		1057
		1058	static void
		1059	gcb (struct ev_signal *w, int revents)
		1060	{
		1061	fprintf (stderr, "generic %x\n", revents);
		1062
		1063	}
		1064
571	int main (void)	1065	int main (void)
572	{	1066	{
573	struct ev_io sin;
574
575	ev_init (0);	1067	ev_init (0);
576		1068
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);	1069	evio_init (&wio, sin_cb, 0, EV_READ);
579	evio_start (&sin);	1070	evio_start (&wio);
580		1071
581	struct ev_timer t[10000];	1072	struct ev_timer t[10000];
582		1073
583	#if 1	1074	#if 0
584	int i;	1075	int i;
585	for (i = 0; i < 10000; ++i)	1076	for (i = 0; i < 10000; ++i)
586	{	1077	{
587	struct ev_timer *w = t + i;	1078	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);	1079	evw_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);	1080	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
590	evtimer_start (w);	1081	evtimer_start (w);
591	if (drand48 () < 0.5)	1082	if (drand48 () < 0.5)
592	evtimer_stop (w);	1083	evtimer_stop (w);
593	}	1084	}
594	#endif	1085	#endif
595		1086
596	struct ev_timer t1;	1087	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);	1088	evtimer_init (&t1, ocb, 5, 10);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);	1089	evtimer_start (&t1);
600		1090
		1091	struct ev_signal sig;
		1092	evsignal_init (&sig, scb, SIGQUIT);
		1093	evsignal_start (&sig);
		1094
		1095	struct ev_check cw;
		1096	evcheck_init (&cw, gcb);
		1097	evcheck_start (&cw);
		1098
		1099	struct ev_idle iw;
		1100	evidle_init (&iw, gcb);
		1101	evidle_start (&iw);
		1102
601	ev_loop (0);	1103	ev_loop (0);
602		1104
603	return 0;	1105	return 0;
604	}	1106	}
605		1107

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Comparing libev/ev.c (file contents): Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs. Revision 1.26 by root, Wed Oct 31 21:50:15 2007 UTC

Diff Legend

Comparing libev/ev.c (file contents):
Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs.
Revision 1.26 by root, Wed Oct 31 21:50:15 2007 UTC