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

Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 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
39	static int have_monotonic; /* runtime */	78	static int have_monotonic; /* runtime */
40		79
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	80	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
42	static void (*method_modify)(int fd, int oev, int nev);	81	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);	82	static void (*method_poll)(ev_tstamp timeout);
		83
		84	/*****************************************************************************/
44		85
45	ev_tstamp	86	ev_tstamp
46	ev_time (void)	87	ev_time (void)
47	{	88	{
48	#if HAVE_REALTIME	89	#if HAVE_REALTIME
72	}	113	}
73		114
74	#define array_needsize(base,cur,cnt,init) \	115	#define array_needsize(base,cur,cnt,init) \
75	if ((cnt) > cur) \	116	if ((cnt) > cur) \
76	{ \	117	{ \
77	int newcnt = cur ? cur << 1 : 16; \	118	int newcnt = cur; \
78	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	\
79	base = realloc (base, sizeof (base) (newcnt)); \	125	base = realloc (base, sizeof (base) (newcnt)); \
80	init (base + cur, newcnt - cur); \	126	init (base + cur, newcnt - cur); \
81	cur = newcnt; \	127	cur = newcnt; \
82	}	128	}
83		129
		130	/*****************************************************************************/
		131
84	typedef struct	132	typedef struct
85	{	133	{
86	struct ev_io *head;	134	struct ev_io *head;
87	unsigned char wev, rev; /* want, received event set */	135	int events;
88	} ANFD;	136	} ANFD;
89		137
90	static ANFD *anfds;	138	static ANFD *anfds;
91	static int anfdmax;	139	static int anfdmax;
92		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
93	static int *fdchanges;	199	static int *fdchanges;
94	static int fdchangemax, fdchangecnt;	200	static int fdchangemax, fdchangecnt;
95		201
96	static void	202	static void
97	anfds_init (ANFD *base, int count)	203	fd_reify (void)
98	{	204	{
99	while (count--)	205	int i;
100	{	206
101	base->head = 0;	207	for (i = 0; i < fdchangecnt; ++i)
102	base->wev = base->rev = EV_NONE;
103	++base;
104	}	208	{
105	}	209	int fd = fdchanges [i];
106
107	typedef struct
108	{
109	struct ev_watcher *w;
110	int events;
111	} ANPENDING;
112
113	static ANPENDING *pendings;
114	static int pendingmax, pendingcnt;
115
116	static void
117	event (struct ev_watcher *w, int events)
118	{
119	w->pending = ++pendingcnt;
120	array_needsize (pendings, pendingmax, pendingcnt, );
121	pendings [pendingcnt - 1].w = w;
122	pendings [pendingcnt - 1].events = events;
123	}
124
125	static void
126	fd_event (int fd, int events)
127	{
128	ANFD *anfd = anfds + fd;	210	ANFD *anfd = anfds + fd;
129	struct ev_io *w;	211	struct ev_io *w;
130		212
		213	int events = 0;
		214
131	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	}
132	{	225	}
133	int ev = w->events & events;
134		226
135	if (ev)	227	fdchangecnt = 0;
136	event ((struct ev_watcher *)w, ev);
137	}
138	}	228	}
139		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	ev_io_stop (anfds [fd].head);
		256	}
		257	}
		258
		259	/*****************************************************************************/
		260
140	static struct ev_timer **atimers;	261	static struct ev_timer **timers;
141	static int atimermax, atimercnt;	262	static int timermax, timercnt;
142		263
143	static struct ev_timer **rtimers;	264	static struct ev_periodic **periodics;
144	static int rtimermax, rtimercnt;	265	static int periodicmax, periodiccnt;
145		266
146	static void	267	static void
147	upheap (struct ev_timer **timers, int k)	268	upheap (WT *timers, int k)
148	{	269	{
149	struct ev_timer *w = timers [k];	270	WT w = timers [k];
150		271
151	while (k && timers [k >> 1]->at > w->at)	272	while (k && timers [k >> 1]->at > w->at)
152	{	273	{
153	timers [k] = timers [k >> 1];	274	timers [k] = timers [k >> 1];
154	timers [k]->active = k + 1;	275	timers [k]->active = k + 1;
…		…
159	timers [k]->active = k + 1;	280	timers [k]->active = k + 1;
160		281
161	}	282	}
162		283
163	static void	284	static void
164	downheap (struct ev_timer **timers, int N, int k)	285	downheap (WT *timers, int N, int k)
165	{	286	{
166	struct ev_timer *w = timers [k];	287	WT w = timers [k];
167		288
168	while (k < (N >> 1))	289	while (k < (N >> 1))
169	{	290	{
170	int j = k << 1;	291	int j = k << 1;
171		292
…		…
181	}	302	}
182		303
183	timers [k] = w;	304	timers [k] = w;
184	timers [k]->active = k + 1;	305	timers [k]->active = k + 1;
185	}	306	}
		307
		308	/*****************************************************************************/
186		309
187	typedef struct	310	typedef struct
188	{	311	{
189	struct ev_signal *head;	312	struct ev_signal *head;
190	sig_atomic_t gotsig;	313	sig_atomic_t gotsig;
…		…
233	if (signals [sig].gotsig)	356	if (signals [sig].gotsig)
234	{	357	{
235	signals [sig].gotsig = 0;	358	signals [sig].gotsig = 0;
236		359
237	for (w = signals [sig].head; w; w = w->next)	360	for (w = signals [sig].head; w; w = w->next)
238	event ((struct ev_watcher *)w, EV_SIGNAL);	361	event ((W)w, EV_SIGNAL);
239	}	362	}
240	}	363	}
241		364
242	static void	365	static void
243	siginit (void)	366	siginit (void)
…		…
247		370
248	/* rather than sort out wether we really need nb, set it */	371	/* rather than sort out wether we really need nb, set it */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	372	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	373	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
251		374
252	evio_set (&sigev, sigpipe [0], EV_READ);	375	ev_io_set (&sigev, sigpipe [0], EV_READ);
253	evio_start (&sigev);	376	ev_io_start (&sigev);
254	}	377	}
		378
		379	/*****************************************************************************/
		380
		381	static struct ev_idle **idles;
		382	static int idlemax, idlecnt;
		383
		384	static struct ev_prepare **prepares;
		385	static int preparemax, preparecnt;
		386
		387	static struct ev_check **checks;
		388	static int checkmax, checkcnt;
		389
		390	/*****************************************************************************/
		391
		392	static struct ev_child *childs [PID_HASHSIZE];
		393	static struct ev_signal childev;
		394
		395	#ifndef WCONTINUED
		396	# define WCONTINUED 0
		397	#endif
		398
		399	static void
		400	childcb (struct ev_signal *sw, int revents)
		401	{
		402	struct ev_child *w;
		403	int pid, status;
		404
		405	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		406	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		407	if (w->pid == pid \|\| w->pid == -1)
		408	{
		409	w->status = status;
		410	event ((W)w, EV_CHILD);
		411	}
		412	}
		413
		414	/*****************************************************************************/
255		415
256	#if HAVE_EPOLL	416	#if HAVE_EPOLL
257	# include "ev_epoll.c"	417	# include "ev_epoll.c"
258	#endif	418	#endif
259	#if HAVE_SELECT	419	#if HAVE_SELECT
260	# include "ev_select.c"	420	# include "ev_select.c"
261	#endif	421	#endif
262		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
263	int ev_init (int flags)	435	int ev_init (int flags)
264	{	436	{
		437	if (!ev_method)
		438	{
265	#if HAVE_MONOTONIC	439	#if HAVE_MONOTONIC
266	{	440	{
267	struct timespec ts;	441	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	442	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;	443	have_monotonic = 1;
270	}	444	}
271	#endif	445	#endif
272		446
273	ev_now = ev_time ();	447	ev_now = ev_time ();
274	now = get_clock ();	448	now = get_clock ();
275	diff = ev_now - now;	449	diff = ev_now - now;
276		450
277	if (pipe (sigpipe))	451	if (pipe (sigpipe))
278	return 0;	452	return 0;
279		453
280	ev_method = EVMETHOD_NONE;	454	ev_method = EVMETHOD_NONE;
281	#if HAVE_EPOLL	455	#if HAVE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	456	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
283	#endif	457	#endif
284	#if HAVE_SELECT	458	#if HAVE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);	459	if (ev_method == EVMETHOD_NONE) select_init (flags);
286	#endif	460	#endif
287		461
288	if (ev_method)	462	if (ev_method)
289	{	463	{
290	evw_init (&sigev, sigcb, 0);	464	ev_watcher_init (&sigev, sigcb);
291	siginit ();	465	siginit ();
		466
		467	ev_signal_init (&childev, childcb, SIGCHLD);
		468	ev_signal_start (&childev);
		469	}
292	}	470	}
293		471
294	return ev_method;	472	return ev_method;
295	}	473	}
296		474
		475	/*****************************************************************************/
		476
		477	void
297	void ev_prefork (void)	478	ev_prefork (void)
298	{	479	{
		480	/* nop */
299	}	481	}
300		482
		483	void
301	void ev_postfork_parent (void)	484	ev_postfork_parent (void)
302	{	485	{
		486	/* nop */
303	}	487	}
304		488
		489	void
305	void ev_postfork_child (void)	490	ev_postfork_child (void)
306	{	491	{
307	#if HAVE_EPOLL	492	#if HAVE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)	493	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();	494	epoll_postfork_child ();
310	#endif	495	#endif
311		496
312	evio_stop (&sigev);	497	ev_io_stop (&sigev);
313	close (sigpipe [0]);	498	close (sigpipe [0]);
314	close (sigpipe [1]);	499	close (sigpipe [1]);
315	pipe (sigpipe);	500	pipe (sigpipe);
316	siginit ();	501	siginit ();
317	}	502	}
318		503
319	static void	504	/*****************************************************************************/
320	fd_reify (void)
321	{
322	int i;
323		505
324	for (i = 0; i < fdchangecnt; ++i)
325	{
326	int fd = fdchanges [i];
327	ANFD *anfd = anfds + fd;
328	struct ev_io *w;
329
330	int wev = 0;
331
332	for (w = anfd->head; w; w = w->next)
333	wev \|= w->events;
334
335	if (anfd->wev != wev)
336	{
337	method_modify (fd, anfd->wev, wev);
338	anfd->wev = wev;
339	}
340	}
341
342	fdchangecnt = 0;
343	}
344
345	static void	506	static void
346	call_pending ()	507	call_pending (void)
347	{	508	{
348	int i;	509	while (pendingcnt)
349
350	for (i = 0; i < pendingcnt; ++i)
351	{	510	{
352	ANPENDING *p = pendings + i;	511	ANPENDING *p = pendings + --pendingcnt;
353		512
354	if (p->w)	513	if (p->w)
355	{	514	{
356	p->w->pending = 0;	515	p->w->pending = 0;
357	p->w->cb (p->w, p->events);	516	p->w->cb (p->w, p->events);
358	}	517	}
359	}	518	}
360
361	pendingcnt = 0;
362	}	519	}
363		520
364	static void	521	static void
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	522	timers_reify (void)
366	{	523	{
367	while (timercnt && timers [0]->at <= now)	524	while (timercnt && timers [0]->at <= now)
368	{	525	{
369	struct ev_timer *w = timers [0];	526	struct ev_timer *w = timers [0];
		527
		528	event ((W)w, EV_TIMEOUT);
370		529
371	/* first reschedule or stop timer */	530	/* first reschedule or stop timer */
372	if (w->repeat)	531	if (w->repeat)
373	{	532	{
374	if (w->is_abs)
375	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
376	else
377	w->at = now + w->repeat;	533	w->at = now + w->repeat;
378		534	assert (("timer timeout in the past, negative repeat?", w->at > now));
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	535	downheap ((WT *)timers, timercnt, 0);
382	}	536	}
383	else	537	else
384	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	538	ev_timer_stop (w); /* nonrepeating: stop timer */
386	--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)
387	}	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 */
388		558
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	559	event ((W)w, EV_TIMEOUT);
390	}	560	}
391	}	561	}
392		562
393	static void	563	static void
394	time_update ()	564	periodics_reschedule (ev_tstamp diff)
395	{	565	{
396	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
397	ev_now = ev_time ();	593	ev_now = ev_time ();
398		594
399	if (have_monotonic)	595	if (have_monotonic)
400	{	596	{
401	ev_tstamp odiff = diff;	597	ev_tstamp odiff = diff;
402		598
403	/* detecting time jumps is much more difficult */
404	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 */
405	{	600	{
406	now = get_clock ();	601	now = get_clock ();
407	diff = ev_now - now;	602	diff = ev_now - now;
408		603
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	604	if (fabs (odiff - diff) < MIN_TIMEJUMP)
410	return; /* all is well */	605	return; /* all is well */
411		606
412	ev_now = ev_time ();	607	ev_now = ev_time ();
413	}	608	}
414		609
415	/* time jump detected, reschedule atimers */	610	periodics_reschedule (diff - odiff);
416	for (i = 0; i < atimercnt; ++i)	611	/* no timer adjustment, as the monotonic clock doesn't jump */
417	{
418	struct ev_timer *w = atimers [i];
419	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
420	}
421	}	612	}
422	else	613	else
423	{	614	{
424	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	615	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425	/* 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 */
426	for (i = 0; i < rtimercnt; ++i)	620	for (i = 0; i < timercnt; ++i)
427	rtimers [i]->at += ev_now - now;	621	timers [i]->at += diff;
		622	}
428		623
429	now = ev_now;	624	now = ev_now;
430	}	625	}
431	}	626	}
432		627
433	int ev_loop_done;	628	int ev_loop_done;
434		629
435	void ev_loop (int flags)	630	void ev_loop (int flags)
436	{	631	{
437	double block;	632	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	633	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
439		634
440	do	635	do
441	{	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
442	/* update fd-related kernel structures */	644	/* update fd-related kernel structures */
443	fd_reify ();	645	fd_reify ();
444		646
445	/* 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
446	if (flags & EVLOOP_NONBLOCK)	653	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
447	block = 0.;	654	block = 0.;
448	else	655	else
449	{	656	{
450	block = MAX_BLOCKTIME;	657	block = MAX_BLOCKTIME;
451		658
452	if (rtimercnt)	659	if (timercnt)
453	{	660	{
454	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;
455	if (block > to) block = to;	662	if (block > to) block = to;
456	}	663	}
457		664
458	if (atimercnt)	665	if (periodiccnt)
459	{	666	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	667	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
461	if (block > to) block = to;	668	if (block > to) block = to;
462	}	669	}
463		670
464	if (block < 0.) block = 0.;	671	if (block < 0.) block = 0.;
465	}	672	}
…		…
467	method_poll (block);	674	method_poll (block);
468		675
469	/* update ev_now, do magic */	676	/* update ev_now, do magic */
470	time_update ();	677	time_update ();
471		678
472	/* put pending timers into pendign queue and reschedule them */	679	/* queue pending timers and reschedule them */
473	/* absolute timers first */	680	timers_reify (); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	681	periodics_reify (); /* absolute timers called first */
475	/* relative timers second */	682
476	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);
477		690
478	call_pending ();	691	call_pending ();
479	}	692	}
480	while (!ev_loop_done);	693	while (!ev_loop_done);
481	}
482		694
		695	if (ev_loop_done != 2)
		696	ev_loop_done = 0;
		697	}
		698
		699	/*****************************************************************************/
		700
483	static void	701	static void
484	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	702	wlist_add (WL *head, WL elem)
485	{	703	{
486	elem->next = *head;	704	elem->next = *head;
487	*head = elem;	705	*head = elem;
488	}	706	}
489		707
490	static void	708	static void
491	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	709	wlist_del (WL *head, WL elem)
492	{	710	{
493	while (*head)	711	while (*head)
494	{	712	{
495	if (*head == elem)	713	if (*head == elem)
496	{	714	{
…		…
501	head = &(*head)->next;	719	head = &(*head)->next;
502	}	720	}
503	}	721	}
504		722
505	static void	723	static void
506	ev_start (struct ev_watcher *w, int active)	724	ev_clear (W w)
507	{	725	{
		726	if (w->pending)
		727	{
		728	pendings [w->pending - 1].w = 0;
508	w->pending = 0;	729	w->pending = 0;
		730	}
		731	}
		732
		733	static void
		734	ev_start (W w, int active)
		735	{
509	w->active = active;	736	w->active = active;
510	}	737	}
511		738
512	static void	739	static void
513	ev_stop (struct ev_watcher *w)	740	ev_stop (W w)
514	{	741	{
515	if (w->pending)
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	742	w->active = 0;
519	/* nop */
520	}	743	}
521		744
		745	/*****************************************************************************/
		746
522	void	747	void
523	evio_start (struct ev_io *w)	748	ev_io_start (struct ev_io *w)
524	{	749	{
525	if (ev_is_active (w))	750	if (ev_is_active (w))
526	return;	751	return;
527		752
528	int fd = w->fd;	753	int fd = w->fd;
529		754
530	ev_start ((struct ev_watcher *)w, 1);	755	ev_start ((W)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	756	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	757	wlist_add ((WL *)&anfds[fd].head, (WL)w);
533		758
534	++fdchangecnt;	759	fd_change (fd);
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}	760	}
538		761
539	void	762	void
540	evio_stop (struct ev_io *w)	763	ev_io_stop (struct ev_io *w)
541	{	764	{
		765	ev_clear ((W)w);
542	if (!ev_is_active (w))	766	if (!ev_is_active (w))
543	return;	767	return;
544		768
545	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);
546	ev_stop ((struct ev_watcher *)w);	770	ev_stop ((W)w);
547		771
548	++fdchangecnt;	772	fd_change (w->fd);
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}	773	}
552		774
553	void	775	void
554	evtimer_start (struct ev_timer *w)	776	ev_timer_start (struct ev_timer *w)
555	{	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);
556	if (ev_is_active (w))	795	if (!ev_is_active (w))
557	return;	796	return;
558		797
559	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);
560	{	802	}
561	/* 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	{
562	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)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	836	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
564		837
565	ev_start ((struct ev_watcher *)w, ++atimercnt);	838	ev_start ((W)w, ++periodiccnt);
566	array_needsize (atimers, atimermax, atimercnt, );	839	array_needsize (periodics, periodicmax, periodiccnt, );
567	atimers [atimercnt - 1] = w;	840	periodics [periodiccnt - 1] = w;
568	upheap (atimers, atimercnt - 1);	841	upheap ((WT *)periodics, periodiccnt - 1);
569	}
570	else
571	{
572	w->at += now;
573
574	ev_start ((struct ev_watcher *)w, ++rtimercnt);
575	array_needsize (rtimers, rtimermax, rtimercnt, );
576	rtimers [rtimercnt - 1] = w;
577	upheap (rtimers, rtimercnt - 1);
578	}
579
580	}	842	}
581		843
582	void	844	void
583	evtimer_stop (struct ev_timer *w)	845	ev_periodic_stop (struct ev_periodic *w)
584	{	846	{
		847	ev_clear ((W)w);
585	if (!ev_is_active (w))	848	if (!ev_is_active (w))
586	return;	849	return;
587		850
588	if (w->is_abs)
589	{
590	if (w->active < atimercnt--)	851	if (w->active < periodiccnt--)
591	{
592	atimers [w->active - 1] = atimers [atimercnt];
593	downheap (atimers, atimercnt, w->active - 1);
594	}
595	}	852	{
596	else	853	periodics [w->active - 1] = periodics [periodiccnt];
		854	downheap ((WT *)periodics, periodiccnt, w->active - 1);
597	{	855	}
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		856
605	ev_stop ((struct ev_watcher *)w);	857	ev_stop ((W)w);
606	}	858	}
607		859
608	void	860	void
609	evsignal_start (struct ev_signal *w)	861	ev_signal_start (struct ev_signal *w)
610	{	862	{
611	if (ev_is_active (w))	863	if (ev_is_active (w))
612	return;	864	return;
613		865
614	ev_start ((struct ev_watcher *)w, 1);	866	ev_start ((W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	867	array_needsize (signals, signalmax, w->signum, signals_init);
616	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);
617		869
618	if (!w->next)	870	if (!w->next)
619	{	871	{
620	struct sigaction sa;	872	struct sigaction sa;
621	sa.sa_handler = sighandler;	873	sa.sa_handler = sighandler;
…		…
624	sigaction (w->signum, &sa, 0);	876	sigaction (w->signum, &sa, 0);
625	}	877	}
626	}	878	}
627		879
628	void	880	void
629	evsignal_stop (struct ev_signal *w)	881	ev_signal_stop (struct ev_signal *w)
630	{	882	{
		883	ev_clear ((W)w);
631	if (!ev_is_active (w))	884	if (!ev_is_active (w))
632	return;	885	return;
633		886
634	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);
635	ev_stop ((struct ev_watcher *)w);	888	ev_stop ((W)w);
636		889
637	if (!signals [w->signum - 1].head)	890	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	891	signal (w->signum, SIG_DFL);
639	}	892	}
640		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
641	/*****************************************************************************/	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
642	#if 1	1048	#if 0
		1049
		1050	struct ev_io wio;
643		1051
644	static void	1052	static void
645	sin_cb (struct ev_io *w, int revents)	1053	sin_cb (struct ev_io *w, int revents)
646	{	1054	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1055	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
649		1057
650	static void	1058	static void
651	ocb (struct ev_timer *w, int revents)	1059	ocb (struct ev_timer *w, int revents)
652	{	1060	{
653	//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);
654	evtimer_stop (w);	1062	ev_timer_stop (w);
655	evtimer_start (w);	1063	ev_timer_start (w);
656	}	1064	}
657		1065
658	static void	1066	static void
659	scb (struct ev_signal *w, int revents)	1067	scb (struct ev_signal *w, int revents)
660	{	1068	{
661	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
662	}	1079	}
663		1080
664	int main (void)	1081	int main (void)
665	{	1082	{
666	struct ev_io sin;
667
668	ev_init (0);	1083	ev_init (0);
669		1084
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);	1085	ev_io_init (&wio, sin_cb, 0, EV_READ);
672	evio_start (&sin);	1086	ev_io_start (&wio);
673		1087
674	struct ev_timer t[10000];	1088	struct ev_timer t[10000];
675		1089
676	#if 0	1090	#if 0
677	int i;	1091	int i;
678	for (i = 0; i < 10000; ++i)	1092	for (i = 0; i < 10000; ++i)
679	{	1093	{
680	struct ev_timer *w = t + i;	1094	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);	1095	ev_watcher_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);	1096	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
683	evtimer_start (w);	1097	ev_timer_start (w);
684	if (drand48 () < 0.5)	1098	if (drand48 () < 0.5)
685	evtimer_stop (w);	1099	ev_timer_stop (w);
686	}	1100	}
687	#endif	1101	#endif
688		1102
689	struct ev_timer t1;	1103	struct ev_timer t1;
690	evw_init (&t1, ocb, 0);	1104	ev_timer_init (&t1, ocb, 5, 10);
691	evtimer_set_abs (&t1, 5, 10);
692	evtimer_start (&t1);	1105	ev_timer_start (&t1);
693		1106
694	struct ev_signal sig;	1107	struct ev_signal sig;
695	evw_init (&sig, scb, 65535);
696	evsignal_set (&sig, SIGQUIT);	1108	ev_signal_init (&sig, scb, SIGQUIT);
697	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);
698		1118
699	ev_loop (0);	1119	ev_loop (0);
700		1120
701	return 0;	1121	return 0;
702	}	1122	}

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Comparing libev/ev.c (file contents): Revision 1.7 by root, Wed Oct 31 00:24:16 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 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.28 by root, Thu Nov 1 06:48:49 2007 UTC