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

Comparing libev/ev.c (file contents):
Revision 1.9 by root, Wed Oct 31 07:24:17 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>
3	#include <unistd.h>	32	#include <unistd.h>
4	#include <fcntl.h>	33	#include <fcntl.h>
5	#include <signal.h>	34	#include <signal.h>
		35	#include <stddef.h>
6		36
7	#include <stdio.h>	37	#include <stdio.h>
8		38
9	#include <assert.h>	39	#include <assert.h>
10	#include <errno.h>	40	#include <errno.h>
		41	#include <sys/types.h>
		42	#include <sys/wait.h>
11	#include <sys/time.h>	43	#include <sys/time.h>
12	#include <time.h>	44	#include <time.h>
13		45
		46	#ifndef HAVE_MONOTONIC
14	#ifdef CLOCK_MONOTONIC	47	# ifdef CLOCK_MONOTONIC
15	# define HAVE_MONOTONIC 1	48	# define HAVE_MONOTONIC 1
16	#endif	49	# endif
		50	#endif
17		51
18	#define HAVE_REALTIME 1	52	#ifndef HAVE_SELECT
19	#define HAVE_EPOLL 1
20	#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
21		63
22	#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) */
23	#define MAX_BLOCKTIME 60.	65	#define MAX_BLOCKTIME 60.
		66	#define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */
24		67
25	#include "ev.h"	68	#include "ev.h"
26		69
27	struct ev_watcher {	70	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);
29	};
30
31	struct ev_watcher_list {	71	typedef struct ev_watcher_list *WL;
32	EV_WATCHER_LIST (ev_watcher_list);	72	typedef struct ev_watcher_time *WT;
33	};
34		73
35	static ev_tstamp now, diff; /* monotonic clock */	74	static ev_tstamp now, diff; /* monotonic clock */
36	ev_tstamp ev_now;	75	ev_tstamp ev_now;
37	int ev_method;	76	int ev_method;
38		77
74	}	113	}
75		114
76	#define array_needsize(base,cur,cnt,init) \	115	#define array_needsize(base,cur,cnt,init) \
77	if ((cnt) > cur) \	116	if ((cnt) > cur) \
78	{ \	117	{ \
79	int newcnt = cur ? cur << 1 : 16; \	118	int newcnt = cur; \
80	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	\
81	base = realloc (base, sizeof (base) (newcnt)); \	125	base = realloc (base, sizeof (base) (newcnt)); \
82	init (base + cur, newcnt - cur); \	126	init (base + cur, newcnt - cur); \
83	cur = newcnt; \	127	cur = newcnt; \
84	}	128	}
85		129
86	/*****************************************************************************/	130	/*****************************************************************************/
87		131
88	typedef struct	132	typedef struct
89	{	133	{
90	struct ev_io *head;	134	struct ev_io *head;
91	unsigned char wev, rev; /* want, received event set */	135	int events;
92	} ANFD;	136	} ANFD;
93		137
94	static ANFD *anfds;	138	static ANFD *anfds;
95	static int anfdmax;	139	static int anfdmax;
96		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
97	static int *fdchanges;	199	static int *fdchanges;
98	static int fdchangemax, fdchangecnt;	200	static int fdchangemax, fdchangecnt;
99		201
100	static void	202	static void
101	anfds_init (ANFD *base, int count)	203	fd_reify (void)
102	{
103	while (count--)
104	{
105	base->head = 0;
106	base->wev = base->rev = EV_NONE;
107	++base;
108	}
109	}
110
111	typedef struct
112	{
113	struct ev_watcher *w;
114	int events;
115	} ANPENDING;
116
117	static ANPENDING *pendings;
118	static int pendingmax, pendingcnt;
119
120	static void
121	event (struct ev_watcher *w, int events)
122	{
123	w->pending = ++pendingcnt;
124	array_needsize (pendings, pendingmax, pendingcnt, );
125	pendings [pendingcnt - 1].w = w;
126	pendings [pendingcnt - 1].events = events;
127	}
128
129	static void
130	fd_event (int fd, int events)
131	{
132	ANFD *anfd = anfds + fd;
133	struct ev_io *w;
134
135	for (w = anfd->head; w; w = w->next)
136	{
137	int ev = w->events & events;
138
139	if (ev)
140	event ((struct ev_watcher *)w, ev);
141	}
142	}
143
144	static void
145	queue_events (struct ev_watcher **events, int eventcnt, int type)
146	{	204	{
147	int i;	205	int i;
148		206
149	for (i = 0; i < eventcnt; ++i)	207	for (i = 0; i < fdchangecnt; ++i)
150	event (events [i], type);	208	{
151	}	209	int fd = fdchanges [i];
		210	ANFD *anfd = anfds + fd;
		211	struct ev_io *w;
152		212
153	/*****************************************************************************/	213	int events = 0;
154		214
		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	}
		225	}
		226
		227	fdchangecnt = 0;
		228	}
		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
155	static struct ev_timer **atimers;	261	static struct ev_timer **timers;
156	static int atimermax, atimercnt;	262	static int timermax, timercnt;
157		263
158	static struct ev_timer **rtimers;	264	static struct ev_periodic **periodics;
159	static int rtimermax, rtimercnt;	265	static int periodicmax, periodiccnt;
160		266
161	static void	267	static void
162	upheap (struct ev_timer **timers, int k)	268	upheap (WT *timers, int k)
163	{	269	{
164	struct ev_timer *w = timers [k];	270	WT w = timers [k];
165		271
166	while (k && timers [k >> 1]->at > w->at)	272	while (k && timers [k >> 1]->at > w->at)
167	{	273	{
168	timers [k] = timers [k >> 1];	274	timers [k] = timers [k >> 1];
169	timers [k]->active = k + 1;	275	timers [k]->active = k + 1;
…		…
174	timers [k]->active = k + 1;	280	timers [k]->active = k + 1;
175		281
176	}	282	}
177		283
178	static void	284	static void
179	downheap (struct ev_timer **timers, int N, int k)	285	downheap (WT *timers, int N, int k)
180	{	286	{
181	struct ev_timer *w = timers [k];	287	WT w = timers [k];
182		288
183	while (k < (N >> 1))	289	while (k < (N >> 1))
184	{	290	{
185	int j = k << 1;	291	int j = k << 1;
186		292
…		…
250	if (signals [sig].gotsig)	356	if (signals [sig].gotsig)
251	{	357	{
252	signals [sig].gotsig = 0;	358	signals [sig].gotsig = 0;
253		359
254	for (w = signals [sig].head; w; w = w->next)	360	for (w = signals [sig].head; w; w = w->next)
255	event ((struct ev_watcher *)w, EV_SIGNAL);	361	event ((W)w, EV_SIGNAL);
256	}	362	}
257	}	363	}
258		364
259	static void	365	static void
260	siginit (void)	366	siginit (void)
…		…
273	/*****************************************************************************/	379	/*****************************************************************************/
274		380
275	static struct ev_idle **idles;	381	static struct ev_idle **idles;
276	static int idlemax, idlecnt;	382	static int idlemax, idlecnt;
277		383
		384	static struct ev_prepare **prepares;
		385	static int preparemax, preparecnt;
		386
278	static struct ev_check **checks;	387	static struct ev_check **checks;
279	static int checkmax, checkcnt;	388	static int checkmax, checkcnt;
280		389
281	/*****************************************************************************/	390	/*****************************************************************************/
282		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	/*****************************************************************************/
		415
283	#if HAVE_EPOLL	416	#if HAVE_EPOLL
284	# include "ev_epoll.c"	417	# include "ev_epoll.c"
285	#endif	418	#endif
286	#if HAVE_SELECT	419	#if HAVE_SELECT
287	# include "ev_select.c"	420	# include "ev_select.c"
288	#endif	421	#endif
289		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
290	int ev_init (int flags)	435	int ev_init (int flags)
291	{	436	{
		437	if (!ev_method)
		438	{
292	#if HAVE_MONOTONIC	439	#if HAVE_MONOTONIC
293	{	440	{
294	struct timespec ts;	441	struct timespec ts;
295	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	442	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
296	have_monotonic = 1;	443	have_monotonic = 1;
297	}	444	}
298	#endif	445	#endif
299		446
300	ev_now = ev_time ();	447	ev_now = ev_time ();
301	now = get_clock ();	448	now = get_clock ();
302	diff = ev_now - now;	449	diff = ev_now - now;
303		450
304	if (pipe (sigpipe))	451	if (pipe (sigpipe))
305	return 0;	452	return 0;
306		453
307	ev_method = EVMETHOD_NONE;	454	ev_method = EVMETHOD_NONE;
308	#if HAVE_EPOLL	455	#if HAVE_EPOLL
309	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	456	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
310	#endif	457	#endif
311	#if HAVE_SELECT	458	#if HAVE_SELECT
312	if (ev_method == EVMETHOD_NONE) select_init (flags);	459	if (ev_method == EVMETHOD_NONE) select_init (flags);
313	#endif	460	#endif
314		461
315	if (ev_method)	462	if (ev_method)
316	{	463	{
317	evw_init (&sigev, sigcb, 0);	464	evw_init (&sigev, sigcb);
318	siginit ();	465	siginit ();
		466
		467	evsignal_init (&childev, childcb, SIGCHLD);
		468	evsignal_start (&childev);
		469	}
319	}	470	}
320		471
321	return ev_method;	472	return ev_method;
322	}	473	}
323		474
324	/*****************************************************************************/	475	/*****************************************************************************/
325		476
		477	void
326	void ev_prefork (void)	478	ev_prefork (void)
327	{	479	{
		480	/* nop */
328	}	481	}
329		482
		483	void
330	void ev_postfork_parent (void)	484	ev_postfork_parent (void)
331	{	485	{
		486	/* nop */
332	}	487	}
333		488
		489	void
334	void ev_postfork_child (void)	490	ev_postfork_child (void)
335	{	491	{
336	#if HAVE_EPOLL	492	#if HAVE_EPOLL
337	if (ev_method == EVMETHOD_EPOLL)	493	if (ev_method == EVMETHOD_EPOLL)
338	epoll_postfork_child ();	494	epoll_postfork_child ();
339	#endif	495	#endif
…		…
346	}	502	}
347		503
348	/*****************************************************************************/	504	/*****************************************************************************/
349		505
350	static void	506	static void
351	fd_reify (void)
352	{
353	int i;
354
355	for (i = 0; i < fdchangecnt; ++i)
356	{
357	int fd = fdchanges [i];
358	ANFD *anfd = anfds + fd;
359	struct ev_io *w;
360
361	int wev = 0;
362
363	for (w = anfd->head; w; w = w->next)
364	wev \|= w->events;
365
366	if (anfd->wev != wev)
367	{
368	method_modify (fd, anfd->wev, wev);
369	anfd->wev = wev;
370	}
371	}
372
373	fdchangecnt = 0;
374	}
375
376	static void
377	call_pending ()	507	call_pending (void)
378	{	508	{
379	int i;	509	while (pendingcnt)
380
381	for (i = 0; i < pendingcnt; ++i)
382	{	510	{
383	ANPENDING *p = pendings + i;	511	ANPENDING *p = pendings + --pendingcnt;
384		512
385	if (p->w)	513	if (p->w)
386	{	514	{
387	p->w->pending = 0;	515	p->w->pending = 0;
388	p->w->cb (p->w, p->events);	516	p->w->cb (p->w, p->events);
389	}	517	}
390	}	518	}
391
392	pendingcnt = 0;
393	}	519	}
394		520
395	static void	521	static void
396	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	522	timers_reify (void)
397	{	523	{
398	while (timercnt && timers [0]->at <= now)	524	while (timercnt && timers [0]->at <= now)
399	{	525	{
400	struct ev_timer *w = timers [0];	526	struct ev_timer *w = timers [0];
		527
		528	event ((W)w, EV_TIMEOUT);
401		529
402	/* first reschedule or stop timer */	530	/* first reschedule or stop timer */
403	if (w->repeat)	531	if (w->repeat)
404	{	532	{
405	if (w->is_abs)
406	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
407	else
408	w->at = now + w->repeat;	533	w->at = now + w->repeat;
409		534	assert (("timer timeout in the past, negative repeat?", w->at > now));
410	assert (w->at > now);
411
412	downheap (timers, timercnt, 0);	535	downheap ((WT *)timers, timercnt, 0);
413	}	536	}
414	else	537	else
415	{
416	evtimer_stop (w); /* nonrepeating: stop timer */	538	evtimer_stop (w); /* nonrepeating: stop timer */
417	--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)
418	}	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 */
419		558
420	event ((struct ev_watcher *)w, EV_TIMEOUT);	559	event ((W)w, EV_TIMEOUT);
421	}	560	}
422	}	561	}
423		562
424	static void	563	static void
425	time_update ()	564	periodics_reschedule (ev_tstamp diff)
426	{	565	{
427	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
428	ev_now = ev_time ();	593	ev_now = ev_time ();
429		594
430	if (have_monotonic)	595	if (have_monotonic)
431	{	596	{
432	ev_tstamp odiff = diff;	597	ev_tstamp odiff = diff;
433		598
434	/* detecting time jumps is much more difficult */
435	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 */
436	{	600	{
437	now = get_clock ();	601	now = get_clock ();
438	diff = ev_now - now;	602	diff = ev_now - now;
439		603
440	if (fabs (odiff - diff) < MIN_TIMEJUMP)	604	if (fabs (odiff - diff) < MIN_TIMEJUMP)
441	return; /* all is well */	605	return; /* all is well */
442		606
443	ev_now = ev_time ();	607	ev_now = ev_time ();
444	}	608	}
445		609
446	/* time jump detected, reschedule atimers */	610	periodics_reschedule (diff - odiff);
447	for (i = 0; i < atimercnt; ++i)	611	/* no timer adjustment, as the monotonic clock doesn't jump */
448	{
449	struct ev_timer *w = atimers [i];
450	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
451	}
452	}	612	}
453	else	613	else
454	{	614	{
455	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	615	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
456	/* 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 */
457	for (i = 0; i < rtimercnt; ++i)	620	for (i = 0; i < timercnt; ++i)
458	rtimers [i]->at += ev_now - now;	621	timers [i]->at += diff;
		622	}
459		623
460	now = ev_now;	624	now = ev_now;
461	}	625	}
462	}	626	}
463		627
464	int ev_loop_done;	628	int ev_loop_done;
465		629
466	void ev_loop (int flags)	630	void ev_loop (int flags)
467	{	631	{
468	double block;	632	double block;
469	ev_loop_done = flags & EVLOOP_ONESHOT;	633	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
470
471	if (checkcnt)
472	{
473	queue_events (checks, checkcnt, EV_CHECK);
474	call_pending ();
475	}
476		634
477	do	635	do
478	{	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
479	/* update fd-related kernel structures */	644	/* update fd-related kernel structures */
480	fd_reify ();	645	fd_reify ();
481		646
482	/* 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
483	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)	653	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
484	block = 0.;	654	block = 0.;
485	else	655	else
486	{	656	{
487	block = MAX_BLOCKTIME;	657	block = MAX_BLOCKTIME;
488		658
489	if (rtimercnt)	659	if (timercnt)
490	{	660	{
491	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;
492	if (block > to) block = to;	662	if (block > to) block = to;
493	}	663	}
494		664
495	if (atimercnt)	665	if (periodiccnt)
496	{	666	{
497	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	667	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
498	if (block > to) block = to;	668	if (block > to) block = to;
499	}	669	}
500		670
501	if (block < 0.) block = 0.;	671	if (block < 0.) block = 0.;
502	}	672	}
…		…
505		675
506	/* update ev_now, do magic */	676	/* update ev_now, do magic */
507	time_update ();	677	time_update ();
508		678
509	/* queue pending timers and reschedule them */	679	/* queue pending timers and reschedule them */
510	/* absolute timers first */	680	timers_reify (); /* relative timers called last */
511	timers_reify (atimers, atimercnt, ev_now);	681	periodics_reify (); /* absolute timers called first */
512	/* relative timers second */
513	timers_reify (rtimers, rtimercnt, now);
514		682
515	/* queue idle watchers unless io or timers are pending */	683	/* queue idle watchers unless io or timers are pending */
516	if (!pendingcnt)	684	if (!pendingcnt)
517	queue_events (idles, idlecnt, EV_IDLE);	685	queue_events ((W *)idles, idlecnt, EV_IDLE);
518		686
519	/* queue check and possibly idle watchers */	687	/* queue check watchers, to be executed first */
		688	if (checkcnt)
520	queue_events (checks, checkcnt, EV_CHECK);	689	queue_events ((W *)checks, checkcnt, EV_CHECK);
521		690
522	call_pending ();	691	call_pending ();
523	}	692	}
524	while (!ev_loop_done);	693	while (!ev_loop_done);
525	}
526		694
527	/*****************************************************************************/	695	if (ev_loop_done != 2)
		696	ev_loop_done = 0;
		697	}
528		698
		699	/*****************************************************************************/
		700
529	static void	701	static void
530	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	702	wlist_add (WL *head, WL elem)
531	{	703	{
532	elem->next = *head;	704	elem->next = *head;
533	*head = elem;	705	*head = elem;
534	}	706	}
535		707
536	static void	708	static void
537	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	709	wlist_del (WL *head, WL elem)
538	{	710	{
539	while (*head)	711	while (*head)
540	{	712	{
541	if (*head == elem)	713	if (*head == elem)
542	{	714	{
…		…
547	head = &(*head)->next;	719	head = &(*head)->next;
548	}	720	}
549	}	721	}
550		722
551	static void	723	static void
552	ev_start (struct ev_watcher *w, int active)	724	ev_clear (W w)
553	{	725	{
		726	if (w->pending)
		727	{
		728	pendings [w->pending - 1].w = 0;
554	w->pending = 0;	729	w->pending = 0;
		730	}
		731	}
		732
		733	static void
		734	ev_start (W w, int active)
		735	{
555	w->active = active;	736	w->active = active;
556	}	737	}
557		738
558	static void	739	static void
559	ev_stop (struct ev_watcher *w)	740	ev_stop (W w)
560	{	741	{
561	if (w->pending)
562	pendings [w->pending - 1].w = 0;
563
564	w->active = 0;	742	w->active = 0;
565	/* nop */
566	}	743	}
567		744
568	/*****************************************************************************/	745	/*****************************************************************************/
569		746
570	void	747	void
…		…
573	if (ev_is_active (w))	750	if (ev_is_active (w))
574	return;	751	return;
575		752
576	int fd = w->fd;	753	int fd = w->fd;
577		754
578	ev_start ((struct ev_watcher *)w, 1);	755	ev_start ((W)w, 1);
579	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	756	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
580	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	757	wlist_add ((WL *)&anfds[fd].head, (WL)w);
581		758
582	++fdchangecnt;	759	fd_change (fd);
583	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
584	fdchanges [fdchangecnt - 1] = fd;
585	}	760	}
586		761
587	void	762	void
588	evio_stop (struct ev_io *w)	763	evio_stop (struct ev_io *w)
589	{	764	{
		765	ev_clear ((W)w);
590	if (!ev_is_active (w))	766	if (!ev_is_active (w))
591	return;	767	return;
592		768
593	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);
594	ev_stop ((struct ev_watcher *)w);	770	ev_stop ((W)w);
595		771
596	++fdchangecnt;	772	fd_change (w->fd);
597	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598	fdchanges [fdchangecnt - 1] = w->fd;
599	}	773	}
600		774
601	void	775	void
602	evtimer_start (struct ev_timer *w)	776	evtimer_start (struct ev_timer *w)
603	{	777	{
604	if (ev_is_active (w))	778	if (ev_is_active (w))
605	return;	779	return;
606		780
607	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);
608	{	802	}
609	/* 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	{
610	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)
611	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	836	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
612		837
613	ev_start ((struct ev_watcher *)w, ++atimercnt);	838	ev_start ((W)w, ++periodiccnt);
614	array_needsize (atimers, atimermax, atimercnt, );	839	array_needsize (periodics, periodicmax, periodiccnt, );
615	atimers [atimercnt - 1] = w;	840	periodics [periodiccnt - 1] = w;
616	upheap (atimers, atimercnt - 1);	841	upheap ((WT *)periodics, periodiccnt - 1);
617	}
618	else
619	{
620	w->at += now;
621
622	ev_start ((struct ev_watcher *)w, ++rtimercnt);
623	array_needsize (rtimers, rtimermax, rtimercnt, );
624	rtimers [rtimercnt - 1] = w;
625	upheap (rtimers, rtimercnt - 1);
626	}
627
628	}	842	}
629		843
630	void	844	void
631	evtimer_stop (struct ev_timer *w)	845	evperiodic_stop (struct ev_periodic *w)
632	{	846	{
		847	ev_clear ((W)w);
633	if (!ev_is_active (w))	848	if (!ev_is_active (w))
634	return;	849	return;
635		850
636	if (w->is_abs)
637	{
638	if (w->active < atimercnt--)	851	if (w->active < periodiccnt--)
639	{
640	atimers [w->active - 1] = atimers [atimercnt];
641	downheap (atimers, atimercnt, w->active - 1);
642	}
643	}	852	{
644	else	853	periodics [w->active - 1] = periodics [periodiccnt];
		854	downheap ((WT *)periodics, periodiccnt, w->active - 1);
645	{	855	}
646	if (w->active < rtimercnt--)
647	{
648	rtimers [w->active - 1] = rtimers [rtimercnt];
649	downheap (rtimers, rtimercnt, w->active - 1);
650	}
651	}
652		856
653	ev_stop ((struct ev_watcher *)w);	857	ev_stop ((W)w);
654	}	858	}
655		859
656	void	860	void
657	evsignal_start (struct ev_signal *w)	861	evsignal_start (struct ev_signal *w)
658	{	862	{
659	if (ev_is_active (w))	863	if (ev_is_active (w))
660	return;	864	return;
661		865
662	ev_start ((struct ev_watcher *)w, 1);	866	ev_start ((W)w, 1);
663	array_needsize (signals, signalmax, w->signum, signals_init);	867	array_needsize (signals, signalmax, w->signum, signals_init);
664	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);	868	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
665		869
666	if (!w->next)	870	if (!w->next)
667	{	871	{
668	struct sigaction sa;	872	struct sigaction sa;
669	sa.sa_handler = sighandler;	873	sa.sa_handler = sighandler;
…		…
674	}	878	}
675		879
676	void	880	void
677	evsignal_stop (struct ev_signal *w)	881	evsignal_stop (struct ev_signal *w)
678	{	882	{
		883	ev_clear ((W)w);
679	if (!ev_is_active (w))	884	if (!ev_is_active (w))
680	return;	885	return;
681		886
682	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);	887	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
683	ev_stop ((struct ev_watcher *)w);	888	ev_stop ((W)w);
684		889
685	if (!signals [w->signum - 1].head)	890	if (!signals [w->signum - 1].head)
686	signal (w->signum, SIG_DFL);	891	signal (w->signum, SIG_DFL);
687	}	892	}
688		893
689	void evidle_start (struct ev_idle *w)	894	void evidle_start (struct ev_idle *w)
690	{	895	{
691	if (ev_is_active (w))	896	if (ev_is_active (w))
692	return;	897	return;
693		898
694	ev_start ((struct ev_watcher *)w, ++idlecnt);	899	ev_start ((W)w, ++idlecnt);
695	array_needsize (idles, idlemax, idlecnt, );	900	array_needsize (idles, idlemax, idlecnt, );
696	idles [idlecnt - 1] = w;	901	idles [idlecnt - 1] = w;
697	}	902	}
698		903
699	void evidle_stop (struct ev_idle *w)	904	void evidle_stop (struct ev_idle *w)
700	{	905	{
		906	ev_clear ((W)w);
		907	if (ev_is_active (w))
		908	return;
		909
701	idles [w->active - 1] = idles [--idlecnt];	910	idles [w->active - 1] = idles [--idlecnt];
702	ev_stop ((struct ev_watcher *)w);	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);
703	}	932	}
704		933
705	void evcheck_start (struct ev_check *w)	934	void evcheck_start (struct ev_check *w)
706	{	935	{
707	if (ev_is_active (w))	936	if (ev_is_active (w))
708	return;	937	return;
709		938
710	ev_start ((struct ev_watcher *)w, ++checkcnt);	939	ev_start ((W)w, ++checkcnt);
711	array_needsize (checks, checkmax, checkcnt, );	940	array_needsize (checks, checkmax, checkcnt, );
712	checks [checkcnt - 1] = w;	941	checks [checkcnt - 1] = w;
713	}	942	}
714		943
715	void evcheck_stop (struct ev_check *w)	944	void evcheck_stop (struct ev_check *w)
716	{	945	{
		946	ev_clear ((W)w);
		947	if (ev_is_active (w))
		948	return;
		949
717	checks [w->active - 1] = checks [--checkcnt];	950	checks [w->active - 1] = checks [--checkcnt];
718	ev_stop ((struct ev_watcher *)w);	951	ev_stop ((W)w);
719	}	952	}
720		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
721	/*****************************************************************************/	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);
		1015	else
		1016	{
		1017	once->cb = cb;
		1018	once->arg = arg;
		1019
		1020	evw_init (&once->io, once_cb_io);
		1021
		1022	if (fd >= 0)
		1023	{
		1024	evio_set (&once->io, fd, events);
		1025	evio_start (&once->io);
		1026	}
		1027
		1028	evw_init (&once->to, once_cb_to);
		1029
		1030	if (timeout >= 0.)
		1031	{
		1032	evtimer_set (&once->to, timeout, 0.);
		1033	evtimer_start (&once->to);
		1034	}
		1035	}
		1036	}
		1037
		1038	/*****************************************************************************/
		1039
722	#if 1	1040	#if 0
		1041
		1042	struct ev_io wio;
723		1043
724	static void	1044	static void
725	sin_cb (struct ev_io *w, int revents)	1045	sin_cb (struct ev_io *w, int revents)
726	{	1046	{
727	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1047	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
737		1057
738	static void	1058	static void
739	scb (struct ev_signal *w, int revents)	1059	scb (struct ev_signal *w, int revents)
740	{	1060	{
741	fprintf (stderr, "signal %x,%d\n", revents, w->signum);	1061	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1062	evio_stop (&wio);
		1063	evio_start (&wio);
742	}	1064	}
743		1065
744	static void	1066	static void
745	gcb (struct ev_signal *w, int revents)	1067	gcb (struct ev_signal *w, int revents)
746	{	1068	{
747	fprintf (stderr, "generic %x\n", revents);	1069	fprintf (stderr, "generic %x\n", revents);
		1070
748	}	1071	}
749		1072
750	int main (void)	1073	int main (void)
751	{	1074	{
752	struct ev_io sin;
753
754	ev_init (0);	1075	ev_init (0);
755		1076
756	evw_init (&sin, sin_cb, 55);
757	evio_set (&sin, 0, EV_READ);	1077	evio_init (&wio, sin_cb, 0, EV_READ);
758	evio_start (&sin);	1078	evio_start (&wio);
759		1079
760	struct ev_timer t[10000];	1080	struct ev_timer t[10000];
761		1081
762	#if 0	1082	#if 0
763	int i;	1083	int i;
764	for (i = 0; i < 10000; ++i)	1084	for (i = 0; i < 10000; ++i)
765	{	1085	{
766	struct ev_timer *w = t + i;	1086	struct ev_timer *w = t + i;
767	evw_init (w, ocb, i);	1087	evw_init (w, ocb, i);
768	evtimer_set_abs (w, drand48 (), 0.99775533);	1088	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
769	evtimer_start (w);	1089	evtimer_start (w);
770	if (drand48 () < 0.5)	1090	if (drand48 () < 0.5)
771	evtimer_stop (w);	1091	evtimer_stop (w);
772	}	1092	}
773	#endif	1093	#endif
774		1094
775	struct ev_timer t1;	1095	struct ev_timer t1;
776	evw_init (&t1, ocb, 0);	1096	evtimer_init (&t1, ocb, 5, 10);
777	evtimer_set_abs (&t1, 5, 10);
778	evtimer_start (&t1);	1097	evtimer_start (&t1);
779		1098
780	struct ev_signal sig;	1099	struct ev_signal sig;
781	evw_init (&sig, scb, 65535);
782	evsignal_set (&sig, SIGQUIT);	1100	evsignal_init (&sig, scb, SIGQUIT);
783	evsignal_start (&sig);	1101	evsignal_start (&sig);
784		1102
785	struct ev_check cw;	1103	struct ev_check cw;
786	evw_init (&cw, gcb, 0);	1104	evcheck_init (&cw, gcb);
787	evcheck_start (&cw);	1105	evcheck_start (&cw);
788		1106
789	struct ev_idle iw;	1107	struct ev_idle iw;
790	evw_init (&iw, gcb, 0);	1108	evidle_init (&iw, gcb);
791	evidle_start (&iw);	1109	evidle_start (&iw);
792		1110
793	ev_loop (0);	1111	ev_loop (0);
794		1112
795	return 0;	1113	return 0;

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Comparing libev/ev.c (file contents): Revision 1.9 by root, Wed Oct 31 07:24:17 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 1.9 by root, Wed Oct 31 07:24:17 2007 UTC vs.
Revision 1.27 by root, Wed Oct 31 22:16:36 2007 UTC