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

Comparing libev/ev.c (file contents):
Revision 1.8 by root, Wed Oct 31 00:32:33 2007 UTC vs.
Revision 1.28 by root, Thu Nov 1 06:48:49 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	{	204	{
103	while (count--)	205	int i;
104	{	206
105	base->head = 0;	207	for (i = 0; i < fdchangecnt; ++i)
106	base->wev = base->rev = EV_NONE;
107	++base;
108	}	208	{
109	}	209	int fd = fdchanges [i];
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;	210	ANFD *anfd = anfds + fd;
133	struct ev_io *w;	211	struct ev_io *w;
134		212
		213	int events = 0;
		214
135	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	}
136	{	225	}
137	int ev = w->events & events;
138		226
139	if (ev)	227	fdchangecnt = 0;
140	event ((struct ev_watcher *)w, ev);
141	}
142	}	228	}
143		229
144	/*****************************************************************************/	230	static void
		231	fd_change (int fd)
		232	{
		233	if (anfds [fd].events & EV_REIFY)
		234	return;
145		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	ev_io_stop (anfds [fd].head);
		256	}
		257	}
		258
		259	/*****************************************************************************/
		260
146	static struct ev_timer **atimers;	261	static struct ev_timer **timers;
147	static int atimermax, atimercnt;	262	static int timermax, timercnt;
148		263
149	static struct ev_timer **rtimers;	264	static struct ev_periodic **periodics;
150	static int rtimermax, rtimercnt;	265	static int periodicmax, periodiccnt;
151		266
152	static void	267	static void
153	upheap (struct ev_timer **timers, int k)	268	upheap (WT *timers, int k)
154	{	269	{
155	struct ev_timer *w = timers [k];	270	WT w = timers [k];
156		271
157	while (k && timers [k >> 1]->at > w->at)	272	while (k && timers [k >> 1]->at > w->at)
158	{	273	{
159	timers [k] = timers [k >> 1];	274	timers [k] = timers [k >> 1];
160	timers [k]->active = k + 1;	275	timers [k]->active = k + 1;
…		…
165	timers [k]->active = k + 1;	280	timers [k]->active = k + 1;
166		281
167	}	282	}
168		283
169	static void	284	static void
170	downheap (struct ev_timer **timers, int N, int k)	285	downheap (WT *timers, int N, int k)
171	{	286	{
172	struct ev_timer *w = timers [k];	287	WT w = timers [k];
173		288
174	while (k < (N >> 1))	289	while (k < (N >> 1))
175	{	290	{
176	int j = k << 1;	291	int j = k << 1;
177		292
…		…
241	if (signals [sig].gotsig)	356	if (signals [sig].gotsig)
242	{	357	{
243	signals [sig].gotsig = 0;	358	signals [sig].gotsig = 0;
244		359
245	for (w = signals [sig].head; w; w = w->next)	360	for (w = signals [sig].head; w; w = w->next)
246	event ((struct ev_watcher *)w, EV_SIGNAL);	361	event ((W)w, EV_SIGNAL);
247	}	362	}
248	}	363	}
249		364
250	static void	365	static void
251	siginit (void)	366	siginit (void)
…		…
255		370
256	/* rather than sort out wether we really need nb, set it */	371	/* rather than sort out wether we really need nb, set it */
257	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	372	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
258	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	373	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
259		374
260	evio_set (&sigev, sigpipe [0], EV_READ);	375	ev_io_set (&sigev, sigpipe [0], EV_READ);
261	evio_start (&sigev);	376	ev_io_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	}
262	}	412	}
263		413
264	/*****************************************************************************/	414	/*****************************************************************************/
265		415
266	#if HAVE_EPOLL	416	#if HAVE_EPOLL
…		…
268	#endif	418	#endif
269	#if HAVE_SELECT	419	#if HAVE_SELECT
270	# include "ev_select.c"	420	# include "ev_select.c"
271	#endif	421	#endif
272		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
273	int ev_init (int flags)	435	int ev_init (int flags)
274	{	436	{
		437	if (!ev_method)
		438	{
275	#if HAVE_MONOTONIC	439	#if HAVE_MONOTONIC
276	{	440	{
277	struct timespec ts;	441	struct timespec ts;
278	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	442	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
279	have_monotonic = 1;	443	have_monotonic = 1;
280	}	444	}
281	#endif	445	#endif
282		446
283	ev_now = ev_time ();	447	ev_now = ev_time ();
284	now = get_clock ();	448	now = get_clock ();
285	diff = ev_now - now;	449	diff = ev_now - now;
286		450
287	if (pipe (sigpipe))	451	if (pipe (sigpipe))
288	return 0;	452	return 0;
289		453
290	ev_method = EVMETHOD_NONE;	454	ev_method = EVMETHOD_NONE;
291	#if HAVE_EPOLL	455	#if HAVE_EPOLL
292	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	456	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
293	#endif	457	#endif
294	#if HAVE_SELECT	458	#if HAVE_SELECT
295	if (ev_method == EVMETHOD_NONE) select_init (flags);	459	if (ev_method == EVMETHOD_NONE) select_init (flags);
296	#endif	460	#endif
297		461
298	if (ev_method)	462	if (ev_method)
299	{	463	{
300	evw_init (&sigev, sigcb, 0);	464	ev_watcher_init (&sigev, sigcb);
301	siginit ();	465	siginit ();
		466
		467	ev_signal_init (&childev, childcb, SIGCHLD);
		468	ev_signal_start (&childev);
		469	}
302	}	470	}
303		471
304	return ev_method;	472	return ev_method;
305	}	473	}
306		474
307	/*****************************************************************************/	475	/*****************************************************************************/
308		476
		477	void
309	void ev_prefork (void)	478	ev_prefork (void)
310	{	479	{
		480	/* nop */
311	}	481	}
312		482
		483	void
313	void ev_postfork_parent (void)	484	ev_postfork_parent (void)
314	{	485	{
		486	/* nop */
315	}	487	}
316		488
		489	void
317	void ev_postfork_child (void)	490	ev_postfork_child (void)
318	{	491	{
319	#if HAVE_EPOLL	492	#if HAVE_EPOLL
320	if (ev_method == EVMETHOD_EPOLL)	493	if (ev_method == EVMETHOD_EPOLL)
321	epoll_postfork_child ();	494	epoll_postfork_child ();
322	#endif	495	#endif
323		496
324	evio_stop (&sigev);	497	ev_io_stop (&sigev);
325	close (sigpipe [0]);	498	close (sigpipe [0]);
326	close (sigpipe [1]);	499	close (sigpipe [1]);
327	pipe (sigpipe);	500	pipe (sigpipe);
328	siginit ();	501	siginit ();
329	}	502	}
330		503
331	/*****************************************************************************/	504	/*****************************************************************************/
332		505
333	static ev_hook hooks [EVHOOK_NUM];
334
335	void
336	ev_hook_register (int type, ev_hook hook)
337	{
338	hooks [type] = hook;
339	}
340
341	void
342	ev_hook_unregister (int type, ev_hook hook)
343	{
344	hooks [type] = 0;
345	}
346
347	static void	506	static void
348	hook_call (int type)
349	{
350	if (hooks [type])
351	hooks [type] ();
352	}
353
354	static void
355	fd_reify (void)
356	{
357	int i;
358
359	for (i = 0; i < fdchangecnt; ++i)
360	{
361	int fd = fdchanges [i];
362	ANFD *anfd = anfds + fd;
363	struct ev_io *w;
364
365	int wev = 0;
366
367	for (w = anfd->head; w; w = w->next)
368	wev \|= w->events;
369
370	if (anfd->wev != wev)
371	{
372	method_modify (fd, anfd->wev, wev);
373	anfd->wev = wev;
374	}
375	}
376
377	fdchangecnt = 0;
378	}
379
380	static void
381	call_pending ()	507	call_pending (void)
382	{	508	{
383	int i;	509	while (pendingcnt)
384
385	for (i = 0; i < pendingcnt; ++i)
386	{	510	{
387	ANPENDING *p = pendings + i;	511	ANPENDING *p = pendings + --pendingcnt;
388		512
389	if (p->w)	513	if (p->w)
390	{	514	{
391	p->w->pending = 0;	515	p->w->pending = 0;
392	p->w->cb (p->w, p->events);	516	p->w->cb (p->w, p->events);
393	}	517	}
394	}	518	}
395
396	pendingcnt = 0;
397	}	519	}
398		520
399	static void	521	static void
400	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	522	timers_reify (void)
401	{	523	{
402	while (timercnt && timers [0]->at <= now)	524	while (timercnt && timers [0]->at <= now)
403	{	525	{
404	struct ev_timer *w = timers [0];	526	struct ev_timer *w = timers [0];
		527
		528	event ((W)w, EV_TIMEOUT);
405		529
406	/* first reschedule or stop timer */	530	/* first reschedule or stop timer */
407	if (w->repeat)	531	if (w->repeat)
408	{	532	{
409	if (w->is_abs)
410	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
411	else
412	w->at = now + w->repeat;	533	w->at = now + w->repeat;
413		534	assert (("timer timeout in the past, negative repeat?", w->at > now));
414	assert (w->at > now);
415
416	downheap (timers, timercnt, 0);	535	downheap ((WT *)timers, timercnt, 0);
417	}	536	}
418	else	537	else
419	{
420	evtimer_stop (w); /* nonrepeating: stop timer */	538	ev_timer_stop (w); /* nonrepeating: stop timer */
421	--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)
422	}	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	ev_periodic_stop (w); /* nonrepeating: stop timer */
423		558
424	event ((struct ev_watcher *)w, EV_TIMEOUT);	559	event ((W)w, EV_TIMEOUT);
425	}	560	}
426	}	561	}
427		562
428	static void	563	static void
429	time_update ()	564	periodics_reschedule (ev_tstamp diff)
430	{	565	{
431	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	ev_periodic_stop (w);
		580	ev_periodic_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
432	ev_now = ev_time ();	593	ev_now = ev_time ();
433		594
434	if (have_monotonic)	595	if (have_monotonic)
435	{	596	{
436	ev_tstamp odiff = diff;	597	ev_tstamp odiff = diff;
437		598
438	/* detecting time jumps is much more difficult */
439	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 */
440	{	600	{
441	now = get_clock ();	601	now = get_clock ();
442	diff = ev_now - now;	602	diff = ev_now - now;
443		603
444	if (fabs (odiff - diff) < MIN_TIMEJUMP)	604	if (fabs (odiff - diff) < MIN_TIMEJUMP)
445	return; /* all is well */	605	return; /* all is well */
446		606
447	ev_now = ev_time ();	607	ev_now = ev_time ();
448	}	608	}
449		609
450	/* time jump detected, reschedule atimers */	610	periodics_reschedule (diff - odiff);
451	for (i = 0; i < atimercnt; ++i)	611	/* no timer adjustment, as the monotonic clock doesn't jump */
452	{
453	struct ev_timer *w = atimers [i];
454	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
455	}
456	}	612	}
457	else	613	else
458	{	614	{
459	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	615	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
460	/* 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 */
461	for (i = 0; i < rtimercnt; ++i)	620	for (i = 0; i < timercnt; ++i)
462	rtimers [i]->at += ev_now - now;	621	timers [i]->at += diff;
		622	}
463		623
464	now = ev_now;	624	now = ev_now;
465	}	625	}
466	}	626	}
467		627
468	int ev_loop_done;	628	int ev_loop_done;
469		629
470	void ev_loop (int flags)	630	void ev_loop (int flags)
471	{	631	{
472	double block;	632	double block;
473	ev_loop_done = flags & EVLOOP_ONESHOT;	633	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
474		634
475	do	635	do
476	{	636	{
477	hook_call (EVHOOK_PREPOLL);	637	/* queue check watchers (and execute them) */
		638	if (preparecnt)
		639	{
		640	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		641	call_pending ();
		642	}
478		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)	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	}
…		…
504	method_poll (block);	674	method_poll (block);
505		675
506	/* update ev_now, do magic */	676	/* update ev_now, do magic */
507	time_update ();	677	time_update ();
508		678
509	hook_call (EVHOOK_POSTPOLL);
510
511	/* put pending timers into pendign queue and reschedule them */	679	/* queue pending timers and reschedule them */
512	/* absolute timers first */	680	timers_reify (); /* relative timers called last */
513	timers_reify (atimers, atimercnt, ev_now);	681	periodics_reify (); /* absolute timers called first */
514	/* relative timers second */	682
515	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);
516		690
517	call_pending ();	691	call_pending ();
518	}	692	}
519	while (!ev_loop_done);	693	while (!ev_loop_done);
520	}
521		694
522	/*****************************************************************************/	695	if (ev_loop_done != 2)
		696	ev_loop_done = 0;
		697	}
523		698
		699	/*****************************************************************************/
		700
524	static void	701	static void
525	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	702	wlist_add (WL *head, WL elem)
526	{	703	{
527	elem->next = *head;	704	elem->next = *head;
528	*head = elem;	705	*head = elem;
529	}	706	}
530		707
531	static void	708	static void
532	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	709	wlist_del (WL *head, WL elem)
533	{	710	{
534	while (*head)	711	while (*head)
535	{	712	{
536	if (*head == elem)	713	if (*head == elem)
537	{	714	{
…		…
542	head = &(*head)->next;	719	head = &(*head)->next;
543	}	720	}
544	}	721	}
545		722
546	static void	723	static void
547	ev_start (struct ev_watcher *w, int active)	724	ev_clear (W w)
548	{	725	{
		726	if (w->pending)
		727	{
		728	pendings [w->pending - 1].w = 0;
549	w->pending = 0;	729	w->pending = 0;
		730	}
		731	}
		732
		733	static void
		734	ev_start (W w, int active)
		735	{
550	w->active = active;	736	w->active = active;
551	}	737	}
552		738
553	static void	739	static void
554	ev_stop (struct ev_watcher *w)	740	ev_stop (W w)
555	{	741	{
556	if (w->pending)
557	pendings [w->pending - 1].w = 0;
558
559	w->active = 0;	742	w->active = 0;
560	/* nop */
561	}	743	}
562		744
563	/*****************************************************************************/	745	/*****************************************************************************/
564		746
565	void	747	void
566	evio_start (struct ev_io *w)	748	ev_io_start (struct ev_io *w)
567	{	749	{
568	if (ev_is_active (w))	750	if (ev_is_active (w))
569	return;	751	return;
570		752
571	int fd = w->fd;	753	int fd = w->fd;
572		754
573	ev_start ((struct ev_watcher *)w, 1);	755	ev_start ((W)w, 1);
574	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	756	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
575	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	757	wlist_add ((WL *)&anfds[fd].head, (WL)w);
576		758
577	++fdchangecnt;	759	fd_change (fd);
578	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
579	fdchanges [fdchangecnt - 1] = fd;
580	}	760	}
581		761
582	void	762	void
583	evio_stop (struct ev_io *w)	763	ev_io_stop (struct ev_io *w)
584	{	764	{
		765	ev_clear ((W)w);
585	if (!ev_is_active (w))	766	if (!ev_is_active (w))
586	return;	767	return;
587		768
588	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);
589	ev_stop ((struct ev_watcher *)w);	770	ev_stop ((W)w);
590		771
591	++fdchangecnt;	772	fd_change (w->fd);
592	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
593	fdchanges [fdchangecnt - 1] = w->fd;
594	}	773	}
595		774
596	void	775	void
597	evtimer_start (struct ev_timer *w)	776	ev_timer_start (struct ev_timer *w)
598	{	777	{
		778	if (ev_is_active (w))
		779	return;
		780
		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	ev_timer_stop (struct ev_timer *w)
		793	{
		794	ev_clear ((W)w);
599	if (ev_is_active (w))	795	if (!ev_is_active (w))
600	return;	796	return;
601		797
602	if (w->is_abs)	798	if (w->active < timercnt--)
		799	{
		800	timers [w->active - 1] = timers [timercnt];
		801	downheap ((WT *)timers, timercnt, w->active - 1);
603	{	802	}
604	/* 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	ev_timer_again (struct ev_timer *w)
		811	{
		812	if (ev_is_active (w))
		813	{
605	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	ev_timer_stop (w);
		821	}
		822	else if (w->repeat)
		823	ev_timer_start (w);
		824	}
		825
		826	void
		827	ev_periodic_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)
606	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	836	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
607		837
608	ev_start ((struct ev_watcher *)w, ++atimercnt);	838	ev_start ((W)w, ++periodiccnt);
609	array_needsize (atimers, atimermax, atimercnt, );	839	array_needsize (periodics, periodicmax, periodiccnt, );
610	atimers [atimercnt - 1] = w;	840	periodics [periodiccnt - 1] = w;
611	upheap (atimers, atimercnt - 1);	841	upheap ((WT *)periodics, periodiccnt - 1);
612	}
613	else
614	{
615	w->at += now;
616
617	ev_start ((struct ev_watcher *)w, ++rtimercnt);
618	array_needsize (rtimers, rtimermax, rtimercnt, );
619	rtimers [rtimercnt - 1] = w;
620	upheap (rtimers, rtimercnt - 1);
621	}
622
623	}	842	}
624		843
625	void	844	void
626	evtimer_stop (struct ev_timer *w)	845	ev_periodic_stop (struct ev_periodic *w)
627	{	846	{
		847	ev_clear ((W)w);
628	if (!ev_is_active (w))	848	if (!ev_is_active (w))
629	return;	849	return;
630		850
631	if (w->is_abs)
632	{
633	if (w->active < atimercnt--)	851	if (w->active < periodiccnt--)
634	{
635	atimers [w->active - 1] = atimers [atimercnt];
636	downheap (atimers, atimercnt, w->active - 1);
637	}
638	}	852	{
639	else	853	periodics [w->active - 1] = periodics [periodiccnt];
		854	downheap ((WT *)periodics, periodiccnt, w->active - 1);
640	{	855	}
641	if (w->active < rtimercnt--)
642	{
643	rtimers [w->active - 1] = rtimers [rtimercnt];
644	downheap (rtimers, rtimercnt, w->active - 1);
645	}
646	}
647		856
648	ev_stop ((struct ev_watcher *)w);	857	ev_stop ((W)w);
649	}	858	}
650		859
651	void	860	void
652	evsignal_start (struct ev_signal *w)	861	ev_signal_start (struct ev_signal *w)
653	{	862	{
654	if (ev_is_active (w))	863	if (ev_is_active (w))
655	return;	864	return;
656		865
657	ev_start ((struct ev_watcher *)w, 1);	866	ev_start ((W)w, 1);
658	array_needsize (signals, signalmax, w->signum, signals_init);	867	array_needsize (signals, signalmax, w->signum, signals_init);
659	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);
660		869
661	if (!w->next)	870	if (!w->next)
662	{	871	{
663	struct sigaction sa;	872	struct sigaction sa;
664	sa.sa_handler = sighandler;	873	sa.sa_handler = sighandler;
…		…
667	sigaction (w->signum, &sa, 0);	876	sigaction (w->signum, &sa, 0);
668	}	877	}
669	}	878	}
670		879
671	void	880	void
672	evsignal_stop (struct ev_signal *w)	881	ev_signal_stop (struct ev_signal *w)
673	{	882	{
		883	ev_clear ((W)w);
674	if (!ev_is_active (w))	884	if (!ev_is_active (w))
675	return;	885	return;
676		886
677	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);
678	ev_stop ((struct ev_watcher *)w);	888	ev_stop ((W)w);
679		889
680	if (!signals [w->signum - 1].head)	890	if (!signals [w->signum - 1].head)
681	signal (w->signum, SIG_DFL);	891	signal (w->signum, SIG_DFL);
682	}	892	}
683		893
		894	void
		895	ev_idle_start (struct ev_idle *w)
		896	{
		897	if (ev_is_active (w))
		898	return;
		899
		900	ev_start ((W)w, ++idlecnt);
		901	array_needsize (idles, idlemax, idlecnt, );
		902	idles [idlecnt - 1] = w;
		903	}
		904
		905	void
		906	ev_idle_stop (struct ev_idle *w)
		907	{
		908	ev_clear ((W)w);
		909	if (ev_is_active (w))
		910	return;
		911
		912	idles [w->active - 1] = idles [--idlecnt];
		913	ev_stop ((W)w);
		914	}
		915
		916	void
		917	ev_prepare_start (struct ev_prepare *w)
		918	{
		919	if (ev_is_active (w))
		920	return;
		921
		922	ev_start ((W)w, ++preparecnt);
		923	array_needsize (prepares, preparemax, preparecnt, );
		924	prepares [preparecnt - 1] = w;
		925	}
		926
		927	void
		928	ev_prepare_stop (struct ev_prepare *w)
		929	{
		930	ev_clear ((W)w);
		931	if (ev_is_active (w))
		932	return;
		933
		934	prepares [w->active - 1] = prepares [--preparecnt];
		935	ev_stop ((W)w);
		936	}
		937
		938	void
		939	ev_check_start (struct ev_check *w)
		940	{
		941	if (ev_is_active (w))
		942	return;
		943
		944	ev_start ((W)w, ++checkcnt);
		945	array_needsize (checks, checkmax, checkcnt, );
		946	checks [checkcnt - 1] = w;
		947	}
		948
		949	void
		950	ev_check_stop (struct ev_check *w)
		951	{
		952	ev_clear ((W)w);
		953	if (ev_is_active (w))
		954	return;
		955
		956	checks [w->active - 1] = checks [--checkcnt];
		957	ev_stop ((W)w);
		958	}
		959
		960	void
		961	ev_child_start (struct ev_child *w)
		962	{
		963	if (ev_is_active (w))
		964	return;
		965
		966	ev_start ((W)w, 1);
		967	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		968	}
		969
		970	void
		971	ev_child_stop (struct ev_child *w)
		972	{
		973	ev_clear ((W)w);
		974	if (ev_is_active (w))
		975	return;
		976
		977	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		978	ev_stop ((W)w);
		979	}
		980
684	/*****************************************************************************/	981	/*****************************************************************************/
		982
		983	struct ev_once
		984	{
		985	struct ev_io io;
		986	struct ev_timer to;
		987	void (cb)(int revents, void arg);
		988	void *arg;
		989	};
		990
		991	static void
		992	once_cb (struct ev_once *once, int revents)
		993	{
		994	void (cb)(int revents, void arg) = once->cb;
		995	void *arg = once->arg;
		996
		997	ev_io_stop (&once->io);
		998	ev_timer_stop (&once->to);
		999	free (once);
		1000
		1001	cb (revents, arg);
		1002	}
		1003
		1004	static void
		1005	once_cb_io (struct ev_io *w, int revents)
		1006	{
		1007	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1008	}
		1009
		1010	static void
		1011	once_cb_to (struct ev_timer *w, int revents)
		1012	{
		1013	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1014	}
		1015
		1016	void
		1017	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1018	{
		1019	struct ev_once *once = malloc (sizeof (struct ev_once));
		1020
		1021	if (!once)
		1022	cb (EV_ERROR, arg);
		1023	else
		1024	{
		1025	once->cb = cb;
		1026	once->arg = arg;
		1027
		1028	ev_watcher_init (&once->io, once_cb_io);
		1029
		1030	if (fd >= 0)
		1031	{
		1032	ev_io_set (&once->io, fd, events);
		1033	ev_io_start (&once->io);
		1034	}
		1035
		1036	ev_watcher_init (&once->to, once_cb_to);
		1037
		1038	if (timeout >= 0.)
		1039	{
		1040	ev_timer_set (&once->to, timeout, 0.);
		1041	ev_timer_start (&once->to);
		1042	}
		1043	}
		1044	}
		1045
		1046	/*****************************************************************************/
		1047
685	#if 1	1048	#if 0
		1049
		1050	struct ev_io wio;
686		1051
687	static void	1052	static void
688	sin_cb (struct ev_io *w, int revents)	1053	sin_cb (struct ev_io *w, int revents)
689	{	1054	{
690	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1055	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
692		1057
693	static void	1058	static void
694	ocb (struct ev_timer *w, int revents)	1059	ocb (struct ev_timer *w, int revents)
695	{	1060	{
696	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1061	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
697	evtimer_stop (w);	1062	ev_timer_stop (w);
698	evtimer_start (w);	1063	ev_timer_start (w);
699	}	1064	}
700		1065
701	static void	1066	static void
702	scb (struct ev_signal *w, int revents)	1067	scb (struct ev_signal *w, int revents)
703	{	1068	{
704	fprintf (stderr, "signal %x,%d\n", revents, w->signum);	1069	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1070	ev_io_stop (&wio);
		1071	ev_io_start (&wio);
		1072	}
		1073
		1074	static void
		1075	gcb (struct ev_signal *w, int revents)
		1076	{
		1077	fprintf (stderr, "generic %x\n", revents);
		1078
705	}	1079	}
706		1080
707	int main (void)	1081	int main (void)
708	{	1082	{
709	struct ev_io sin;
710
711	ev_init (0);	1083	ev_init (0);
712		1084
713	evw_init (&sin, sin_cb, 55);
714	evio_set (&sin, 0, EV_READ);	1085	ev_io_init (&wio, sin_cb, 0, EV_READ);
715	evio_start (&sin);	1086	ev_io_start (&wio);
716		1087
717	struct ev_timer t[10000];	1088	struct ev_timer t[10000];
718		1089
719	#if 1	1090	#if 0
720	int i;	1091	int i;
721	for (i = 0; i < 10000; ++i)	1092	for (i = 0; i < 10000; ++i)
722	{	1093	{
723	struct ev_timer *w = t + i;	1094	struct ev_timer *w = t + i;
724	evw_init (w, ocb, i);	1095	ev_watcher_init (w, ocb, i);
725	evtimer_set_abs (w, drand48 (), 0.99775533);	1096	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
726	evtimer_start (w);	1097	ev_timer_start (w);
727	if (drand48 () < 0.5)	1098	if (drand48 () < 0.5)
728	evtimer_stop (w);	1099	ev_timer_stop (w);
729	}	1100	}
730	#endif	1101	#endif
731		1102
732	struct ev_timer t1;	1103	struct ev_timer t1;
733	evw_init (&t1, ocb, 0);	1104	ev_timer_init (&t1, ocb, 5, 10);
734	evtimer_set_abs (&t1, 5, 10);
735	evtimer_start (&t1);	1105	ev_timer_start (&t1);
736		1106
737	struct ev_signal sig;	1107	struct ev_signal sig;
738	evw_init (&sig, scb, 65535);
739	evsignal_set (&sig, SIGQUIT);	1108	ev_signal_init (&sig, scb, SIGQUIT);
740	evsignal_start (&sig);	1109	ev_signal_start (&sig);
		1110
		1111	struct ev_check cw;
		1112	ev_check_init (&cw, gcb);
		1113	ev_check_start (&cw);
		1114
		1115	struct ev_idle iw;
		1116	ev_idle_init (&iw, gcb);
		1117	ev_idle_start (&iw);
741		1118
742	ev_loop (0);	1119	ev_loop (0);
743		1120
744	return 0;	1121	return 0;
745	}	1122	}

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Comparing libev/ev.c (file contents): Revision 1.8 by root, Wed Oct 31 00:32:33 2007 UTC vs. Revision 1.28 by root, Thu Nov 1 06:48:49 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.8 by root, Wed Oct 31 00:32:33 2007 UTC vs.
Revision 1.28 by root, Thu Nov 1 06:48:49 2007 UTC