[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 1.32 by root, Thu Nov 1 09:21:51 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	#if EV_USE_CONFIG_H
		30	# include "config.h"
		31	#endif
		32
1	#include <math.h>	33	#include <math.h>
2	#include <stdlib.h>	34	#include <stdlib.h>
3	#include <unistd.h>	35	#include <unistd.h>
4	#include <fcntl.h>	36	#include <fcntl.h>
5	#include <signal.h>	37	#include <signal.h>
		38	#include <stddef.h>
6		39
7	#include <stdio.h>	40	#include <stdio.h>
8		41
9	#include <assert.h>	42	#include <assert.h>
10	#include <errno.h>	43	#include <errno.h>
		44	#include <sys/types.h>
		45	#include <sys/wait.h>
11	#include <sys/time.h>	46	#include <sys/time.h>
12	#include <time.h>	47	#include <time.h>
13		48
		49	#ifndef EV_USE_MONOTONIC
14	#ifdef CLOCK_MONOTONIC	50	# ifdef CLOCK_MONOTONIC
15	# define HAVE_MONOTONIC 1	51	# define EV_USE_MONOTONIC 1
16	#endif	52	# endif
		53	#endif
17		54
18	#define HAVE_REALTIME 1	55	#ifndef EV_USE_SELECT
19	#define HAVE_EPOLL 1
20	#define HAVE_SELECT 1	56	# define EV_USE_SELECT 1
		57	#endif
		58
		59	#ifndef EV_USE_EPOLL
		60	# define EV_USE_EPOLL 0
		61	#endif
		62
		63	#ifndef CLOCK_REALTIME
		64	# define EV_USE_REALTIME 0
		65	#endif
		66	#ifndef EV_USE_REALTIME
		67	# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */
		68	#endif
21		69
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	70	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	71	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detetc time jumps) */
		72	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		73	#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
24		74
25	#include "ev.h"	75	#include "ev.h"
26		76
27	struct ev_watcher {	77	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);
29	};
30
31	struct ev_watcher_list {	78	typedef struct ev_watcher_list *WL;
32	EV_WATCHER_LIST (ev_watcher_list);	79	typedef struct ev_watcher_time *WT;
33	};
34		80
35	static ev_tstamp now, diff; /* monotonic clock */	81	static ev_tstamp now, diff; /* monotonic clock */
36	ev_tstamp ev_now;	82	ev_tstamp ev_now;
37	int ev_method;	83	int ev_method;
38		84
40		86
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	87	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
42	static void (*method_modify)(int fd, int oev, int nev);	88	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);	89	static void (*method_poll)(ev_tstamp timeout);
44		90
		91	/*****************************************************************************/
		92
45	ev_tstamp	93	ev_tstamp
46	ev_time (void)	94	ev_time (void)
47	{	95	{
48	#if HAVE_REALTIME	96	#if EV_USE_REALTIME
49	struct timespec ts;	97	struct timespec ts;
50	clock_gettime (CLOCK_REALTIME, &ts);	98	clock_gettime (CLOCK_REALTIME, &ts);
51	return ts.tv_sec + ts.tv_nsec * 1e-9;	99	return ts.tv_sec + ts.tv_nsec * 1e-9;
52	#else	100	#else
53	struct timeval tv;	101	struct timeval tv;
…		…
57	}	105	}
58		106
59	static ev_tstamp	107	static ev_tstamp
60	get_clock (void)	108	get_clock (void)
61	{	109	{
62	#if HAVE_MONOTONIC	110	#if EV_USE_MONOTONIC
63	if (have_monotonic)	111	if (have_monotonic)
64	{	112	{
65	struct timespec ts;	113	struct timespec ts;
66	clock_gettime (CLOCK_MONOTONIC, &ts);	114	clock_gettime (CLOCK_MONOTONIC, &ts);
67	return ts.tv_sec + ts.tv_nsec * 1e-9;	115	return ts.tv_sec + ts.tv_nsec * 1e-9;
…		…
69	#endif	117	#endif
70		118
71	return ev_time ();	119	return ev_time ();
72	}	120	}
73		121
		122	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		123
74	#define array_needsize(base,cur,cnt,init) \	124	#define array_needsize(base,cur,cnt,init) \
75	if ((cnt) > cur) \	125	if ((cnt) > cur) \
76	{ \	126	{ \
77	int newcnt = cur ? cur << 1 : 16; \	127	int newcnt = cur; \
78	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	128	do \
		129	{ \
		130	newcnt = array_roundsize (base, newcnt << 1); \
		131	} \
		132	while ((cnt) > newcnt); \
		133	\
79	base = realloc (base, sizeof (base) (newcnt)); \	134	base = realloc (base, sizeof (base) (newcnt)); \
80	init (base + cur, newcnt - cur); \	135	init (base + cur, newcnt - cur); \
81	cur = newcnt; \	136	cur = newcnt; \
82	}	137	}
83		138
		139	/*****************************************************************************/
		140
84	typedef struct	141	typedef struct
85	{	142	{
86	struct ev_io *head;	143	struct ev_io *head;
87	unsigned char wev, rev; /* want, received event set */	144	int events;
88	} ANFD;	145	} ANFD;
89		146
90	static ANFD *anfds;	147	static ANFD *anfds;
91	static int anfdmax;	148	static int anfdmax;
92		149
93	static int *fdchanges;
94	static int fdchangemax, fdchangecnt;
95
96	static void	150	static void
97	anfds_init (ANFD *base, int count)	151	anfds_init (ANFD *base, int count)
98	{	152	{
99	while (count--)	153	while (count--)
100	{	154	{
101	base->head = 0;	155	base->head = 0;
102	base->wev = base->rev = EV_NONE;	156	base->events = EV_NONE;
103	++base;	157	++base;
104	}	158	}
105	}	159	}
106		160
107	typedef struct	161	typedef struct
108	{	162	{
109	struct ev_watcher *w;	163	W w;
110	int events;	164	int events;
111	} ANPENDING;	165	} ANPENDING;
112		166
113	static ANPENDING *pendings;	167	static ANPENDING *pendings;
114	static int pendingmax, pendingcnt;	168	static int pendingmax, pendingcnt;
115		169
116	static void	170	static void
117	event (struct ev_watcher *w, int events)	171	event (W w, int events)
118	{	172	{
		173	if (w->pending)
		174	{
		175	pendings [w->pending - 1].events \|= events;
		176	return;
		177	}
		178
119	w->pending = ++pendingcnt;	179	w->pending = ++pendingcnt;
120	array_needsize (pendings, pendingmax, pendingcnt, );	180	array_needsize (pendings, pendingmax, pendingcnt, );
121	pendings [pendingcnt - 1].w = w;	181	pendings [pendingcnt - 1].w = w;
122	pendings [pendingcnt - 1].events = events;	182	pendings [pendingcnt - 1].events = events;
123	}	183	}
124		184
125	static void	185	static void
		186	queue_events (W *events, int eventcnt, int type)
		187	{
		188	int i;
		189
		190	for (i = 0; i < eventcnt; ++i)
		191	event (events [i], type);
		192	}
		193
		194	static void
126	fd_event (int fd, int events)	195	fd_event (int fd, int events)
127	{	196	{
128	ANFD *anfd = anfds + fd;	197	ANFD *anfd = anfds + fd;
129	struct ev_io *w;	198	struct ev_io *w;
130		199
131	for (w = anfd->head; w; w = w->next)	200	for (w = anfd->head; w; w = w->next)
132	{	201	{
133	int ev = w->events & events;	202	int ev = w->events & events;
134		203
135	if (ev)	204	if (ev)
136	event ((struct ev_watcher *)w, ev);	205	event ((W)w, ev);
		206	}
		207	}
		208
		209	/*****************************************************************************/
		210
		211	static int *fdchanges;
		212	static int fdchangemax, fdchangecnt;
		213
		214	static void
		215	fd_reify (void)
		216	{
		217	int i;
		218
		219	for (i = 0; i < fdchangecnt; ++i)
137	}	220	{
138	}	221	int fd = fdchanges [i];
		222	ANFD *anfd = anfds + fd;
		223	struct ev_io *w;
139		224
		225	int events = 0;
		226
		227	for (w = anfd->head; w; w = w->next)
		228	events \|= w->events;
		229
		230	anfd->events &= ~EV_REIFY;
		231
		232	if (anfd->events != events)
		233	{
		234	method_modify (fd, anfd->events, events);
		235	anfd->events = events;
		236	}
		237	}
		238
		239	fdchangecnt = 0;
		240	}
		241
		242	static void
		243	fd_change (int fd)
		244	{
		245	if (anfds [fd].events & EV_REIFY \|\| fdchangecnt < 0)
		246	return;
		247
		248	anfds [fd].events \|= EV_REIFY;
		249
		250	++fdchangecnt;
		251	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		252	fdchanges [fdchangecnt - 1] = fd;
		253	}
		254
		255	/* called on EBADF to verify fds */
		256	static void
		257	fd_recheck (void)
		258	{
		259	int fd;
		260
		261	for (fd = 0; fd < anfdmax; ++fd)
		262	if (anfds [fd].events)
		263	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		264	while (anfds [fd].head)
		265	{
		266	ev_io_stop (anfds [fd].head);
		267	event ((W)anfds [fd].head, EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT);
		268	}
		269	}
		270
		271	/*****************************************************************************/
		272
140	static struct ev_timer **atimers;	273	static struct ev_timer **timers;
141	static int atimermax, atimercnt;	274	static int timermax, timercnt;
142		275
143	static struct ev_timer **rtimers;	276	static struct ev_periodic **periodics;
144	static int rtimermax, rtimercnt;	277	static int periodicmax, periodiccnt;
145		278
146	static void	279	static void
147	upheap (struct ev_timer **timers, int k)	280	upheap (WT *timers, int k)
148	{	281	{
149	struct ev_timer *w = timers [k];	282	WT w = timers [k];
150		283
151	while (k && timers [k >> 1]->at > w->at)	284	while (k && timers [k >> 1]->at > w->at)
152	{	285	{
153	timers [k] = timers [k >> 1];	286	timers [k] = timers [k >> 1];
154	timers [k]->active = k + 1;	287	timers [k]->active = k + 1;
…		…
159	timers [k]->active = k + 1;	292	timers [k]->active = k + 1;
160		293
161	}	294	}
162		295
163	static void	296	static void
164	downheap (struct ev_timer **timers, int N, int k)	297	downheap (WT *timers, int N, int k)
165	{	298	{
166	struct ev_timer *w = timers [k];	299	WT w = timers [k];
167		300
168	while (k < (N >> 1))	301	while (k < (N >> 1))
169	{	302	{
170	int j = k << 1;	303	int j = k << 1;
171		304
…		…
181	}	314	}
182		315
183	timers [k] = w;	316	timers [k] = w;
184	timers [k]->active = k + 1;	317	timers [k]->active = k + 1;
185	}	318	}
		319
		320	/*****************************************************************************/
186		321
187	typedef struct	322	typedef struct
188	{	323	{
189	struct ev_signal *head;	324	struct ev_signal *head;
190	sig_atomic_t gotsig;	325	sig_atomic_t gotsig;
…		…
233	if (signals [sig].gotsig)	368	if (signals [sig].gotsig)
234	{	369	{
235	signals [sig].gotsig = 0;	370	signals [sig].gotsig = 0;
236		371
237	for (w = signals [sig].head; w; w = w->next)	372	for (w = signals [sig].head; w; w = w->next)
238	event ((struct ev_watcher *)w, EV_SIGNAL);	373	event ((W)w, EV_SIGNAL);
239	}	374	}
240	}	375	}
241		376
242	static void	377	static void
243	siginit (void)	378	siginit (void)
…		…
247		382
248	/* rather than sort out wether we really need nb, set it */	383	/* rather than sort out wether we really need nb, set it */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	384	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	385	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
251		386
252	evio_set (&sigev, sigpipe [0], EV_READ);	387	ev_io_set (&sigev, sigpipe [0], EV_READ);
253	evio_start (&sigev);	388	ev_io_start (&sigev);
254	}	389	}
255		390
		391	/*****************************************************************************/
		392
		393	static struct ev_idle **idles;
		394	static int idlemax, idlecnt;
		395
		396	static struct ev_prepare **prepares;
		397	static int preparemax, preparecnt;
		398
		399	static struct ev_check **checks;
		400	static int checkmax, checkcnt;
		401
		402	/*****************************************************************************/
		403
		404	static struct ev_child *childs [PID_HASHSIZE];
		405	static struct ev_signal childev;
		406
		407	#ifndef WCONTINUED
		408	# define WCONTINUED 0
		409	#endif
		410
		411	static void
		412	childcb (struct ev_signal *sw, int revents)
		413	{
		414	struct ev_child *w;
		415	int pid, status;
		416
		417	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		418	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		419	if (w->pid == pid \|\| w->pid == -1)
		420	{
		421	w->status = status;
		422	event ((W)w, EV_CHILD);
		423	}
		424	}
		425
		426	/*****************************************************************************/
		427
256	#if HAVE_EPOLL	428	#if EV_USE_EPOLL
257	# include "ev_epoll.c"	429	# include "ev_epoll.c"
258	#endif	430	#endif
259	#if HAVE_SELECT	431	#if EV_USE_SELECT
260	# include "ev_select.c"	432	# include "ev_select.c"
261	#endif	433	#endif
262		434
		435	int
		436	ev_version_major (void)
		437	{
		438	return EV_VERSION_MAJOR;
		439	}
		440
		441	int
		442	ev_version_minor (void)
		443	{
		444	return EV_VERSION_MINOR;
		445	}
		446
263	int ev_init (int flags)	447	int ev_init (int flags)
264	{	448	{
265	#if HAVE_MONOTONIC
266	{
267	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;
270	}
271	#endif
272
273	ev_now = ev_time ();
274	now = get_clock ();
275	diff = ev_now - now;
276
277	if (pipe (sigpipe))
278	return 0;
279
280	ev_method = EVMETHOD_NONE;
281	#if HAVE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
283	#endif
284	#if HAVE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);
286	#endif
287
288	if (ev_method)	449	if (!ev_method)
		450	{
		451	#if EV_USE_MONOTONIC
289	{	452	{
		453	struct timespec ts;
		454	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		455	have_monotonic = 1;
		456	}
		457	#endif
		458
		459	ev_now = ev_time ();
		460	now = get_clock ();
		461	diff = ev_now - now;
		462
		463	if (pipe (sigpipe))
		464	return 0;
		465
		466	ev_method = EVMETHOD_NONE;
		467	#if EV_USE_EPOLL
		468	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
		469	#endif
		470	#if EV_USE_SELECT
		471	if (ev_method == EVMETHOD_NONE) select_init (flags);
		472	#endif
		473
		474	if (ev_method)
		475	{
290	evw_init (&sigev, sigcb, 0);	476	ev_watcher_init (&sigev, sigcb);
291	siginit ();	477	siginit ();
		478
		479	ev_signal_init (&childev, childcb, SIGCHLD);
		480	ev_signal_start (&childev);
		481	}
292	}	482	}
293		483
294	return ev_method;	484	return ev_method;
295	}	485	}
296		486
		487	/*****************************************************************************/
		488
		489	void
297	void ev_prefork (void)	490	ev_prefork (void)
298	{	491	{
		492	/* nop */
299	}	493	}
300		494
		495	void
301	void ev_postfork_parent (void)	496	ev_postfork_parent (void)
302	{	497	{
		498	/* nop */
303	}	499	}
304		500
		501	void
305	void ev_postfork_child (void)	502	ev_postfork_child (void)
306	{	503	{
307	#if HAVE_EPOLL	504	#if EV_USE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)	505	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();	506	epoll_postfork_child ();
310	#endif	507	#endif
311		508
312	evio_stop (&sigev);	509	ev_io_stop (&sigev);
313	close (sigpipe [0]);	510	close (sigpipe [0]);
314	close (sigpipe [1]);	511	close (sigpipe [1]);
315	pipe (sigpipe);	512	pipe (sigpipe);
316	siginit ();	513	siginit ();
317	}	514	}
318		515
319	static void	516	/*****************************************************************************/
320	fd_reify (void)
321	{
322	int i;
323		517
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	518	static void
346	call_pending ()	519	call_pending (void)
347	{	520	{
348	int i;	521	while (pendingcnt)
349
350	for (i = 0; i < pendingcnt; ++i)
351	{	522	{
352	ANPENDING *p = pendings + i;	523	ANPENDING *p = pendings + --pendingcnt;
353		524
354	if (p->w)	525	if (p->w)
355	{	526	{
356	p->w->pending = 0;	527	p->w->pending = 0;
357	p->w->cb (p->w, p->events);	528	p->w->cb (p->w, p->events);
358	}	529	}
359	}	530	}
360
361	pendingcnt = 0;
362	}	531	}
363		532
364	static void	533	static void
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	534	timers_reify (void)
366	{	535	{
367	while (timercnt && timers [0]->at <= now)	536	while (timercnt && timers [0]->at <= now)
368	{	537	{
369	struct ev_timer *w = timers [0];	538	struct ev_timer *w = timers [0];
370		539
371	/* first reschedule or stop timer */	540	/* first reschedule or stop timer */
372	if (w->repeat)	541	if (w->repeat)
373	{	542	{
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;	543	w->at = now + w->repeat;
378		544	assert (("timer timeout in the past, negative repeat?", w->at > now));
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	545	downheap ((WT *)timers, timercnt, 0);
382	}	546	}
383	else	547	else
384	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	548	ev_timer_stop (w); /* nonrepeating: stop timer */
386	--timercnt; /* maybe pass by reference instead? */	549
		550	event ((W)w, EV_TIMEOUT);
		551	}
		552	}
		553
		554	static void
		555	periodics_reify (void)
		556	{
		557	while (periodiccnt && periodics [0]->at <= ev_now)
		558	{
		559	struct ev_periodic *w = periodics [0];
		560
		561	/* first reschedule or stop timer */
		562	if (w->interval)
387	}	563	{
		564	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		565	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
		566	downheap ((WT *)periodics, periodiccnt, 0);
		567	}
		568	else
		569	ev_periodic_stop (w); /* nonrepeating: stop timer */
388		570
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	571	event ((W)w, EV_TIMEOUT);
390	}	572	}
391	}	573	}
392		574
393	static void	575	static void
394	time_update ()	576	periodics_reschedule (ev_tstamp diff)
395	{	577	{
396	int i;	578	int i;
		579
		580	/* adjust periodics after time jump */
		581	for (i = 0; i < periodiccnt; ++i)
		582	{
		583	struct ev_periodic *w = periodics [i];
		584
		585	if (w->interval)
		586	{
		587	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		588
		589	if (fabs (diff) >= 1e-4)
		590	{
		591	ev_periodic_stop (w);
		592	ev_periodic_start (w);
		593
		594	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		595	}
		596	}
		597	}
		598	}
		599
		600	static void
		601	time_update (void)
		602	{
		603	int i;
		604
397	ev_now = ev_time ();	605	ev_now = ev_time ();
398		606
399	if (have_monotonic)	607	if (have_monotonic)
400	{	608	{
401	ev_tstamp odiff = diff;	609	ev_tstamp odiff = diff;
402		610
403	/* detecting time jumps is much more difficult */
404	for (i = 2; --i; ) /* loop a few times, before making important decisions */	611	for (i = 4; --i; ) /* loop a few times, before making important decisions */
405	{	612	{
406	now = get_clock ();	613	now = get_clock ();
407	diff = ev_now - now;	614	diff = ev_now - now;
408		615
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	616	if (fabs (odiff - diff) < MIN_TIMEJUMP)
410	return; /* all is well */	617	return; /* all is well */
411		618
412	ev_now = ev_time ();	619	ev_now = ev_time ();
413	}	620	}
414		621
415	/* time jump detected, reschedule atimers */	622	periodics_reschedule (diff - odiff);
416	for (i = 0; i < atimercnt; ++i)	623	/* 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	}	624	}
422	else	625	else
423	{	626	{
424	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	627	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425	/* time jump detected, adjust rtimers */	628	{
		629	periodics_reschedule (ev_now - now);
		630
		631	/* adjust timers. this is easy, as the offset is the same for all */
426	for (i = 0; i < rtimercnt; ++i)	632	for (i = 0; i < timercnt; ++i)
427	rtimers [i]->at += ev_now - now;	633	timers [i]->at += diff;
		634	}
428		635
429	now = ev_now;	636	now = ev_now;
430	}	637	}
431	}	638	}
432		639
433	int ev_loop_done;	640	int ev_loop_done;
434		641
435	void ev_loop (int flags)	642	void ev_loop (int flags)
436	{	643	{
437	double block;	644	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	645	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
439		646
440	do	647	do
441	{	648	{
		649	/* queue check watchers (and execute them) */
		650	if (preparecnt)
		651	{
		652	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		653	call_pending ();
		654	}
		655
442	/* update fd-related kernel structures */	656	/* update fd-related kernel structures */
443	fd_reify ();	657	fd_reify ();
444		658
445	/* calculate blocking time */	659	/* calculate blocking time */
		660
		661	/* we only need this for !monotonic clockor timers, but as we basically
		662	always have timers, we just calculate it always */
		663	ev_now = ev_time ();
		664
446	if (flags & EVLOOP_NONBLOCK)	665	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
447	block = 0.;	666	block = 0.;
448	else	667	else
449	{	668	{
450	block = MAX_BLOCKTIME;	669	block = MAX_BLOCKTIME;
451		670
452	if (rtimercnt)	671	if (timercnt)
453	{	672	{
454	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	673	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
455	if (block > to) block = to;	674	if (block > to) block = to;
456	}	675	}
457		676
458	if (atimercnt)	677	if (periodiccnt)
459	{	678	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	679	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
461	if (block > to) block = to;	680	if (block > to) block = to;
462	}	681	}
463		682
464	if (block < 0.) block = 0.;	683	if (block < 0.) block = 0.;
465	}	684	}
…		…
467	method_poll (block);	686	method_poll (block);
468		687
469	/* update ev_now, do magic */	688	/* update ev_now, do magic */
470	time_update ();	689	time_update ();
471		690
472	/* put pending timers into pendign queue and reschedule them */	691	/* queue pending timers and reschedule them */
473	/* absolute timers first */	692	timers_reify (); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	693	periodics_reify (); /* absolute timers called first */
475	/* relative timers second */	694
476	timers_reify (rtimers, rtimercnt, now);	695	/* queue idle watchers unless io or timers are pending */
		696	if (!pendingcnt)
		697	queue_events ((W *)idles, idlecnt, EV_IDLE);
		698
		699	/* queue check watchers, to be executed first */
		700	if (checkcnt)
		701	queue_events ((W *)checks, checkcnt, EV_CHECK);
477		702
478	call_pending ();	703	call_pending ();
479	}	704	}
480	while (!ev_loop_done);	705	while (!ev_loop_done);
481	}
482		706
		707	if (ev_loop_done != 2)
		708	ev_loop_done = 0;
		709	}
		710
		711	/*****************************************************************************/
		712
483	static void	713	static void
484	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	714	wlist_add (WL *head, WL elem)
485	{	715	{
486	elem->next = *head;	716	elem->next = *head;
487	*head = elem;	717	*head = elem;
488	}	718	}
489		719
490	static void	720	static void
491	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	721	wlist_del (WL *head, WL elem)
492	{	722	{
493	while (*head)	723	while (*head)
494	{	724	{
495	if (*head == elem)	725	if (*head == elem)
496	{	726	{
…		…
501	head = &(*head)->next;	731	head = &(*head)->next;
502	}	732	}
503	}	733	}
504		734
505	static void	735	static void
506	ev_start (struct ev_watcher *w, int active)	736	ev_clear (W w)
507	{	737	{
		738	if (w->pending)
		739	{
		740	pendings [w->pending - 1].w = 0;
508	w->pending = 0;	741	w->pending = 0;
		742	}
		743	}
		744
		745	static void
		746	ev_start (W w, int active)
		747	{
509	w->active = active;	748	w->active = active;
510	}	749	}
511		750
512	static void	751	static void
513	ev_stop (struct ev_watcher *w)	752	ev_stop (W w)
514	{	753	{
515	if (w->pending)
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	754	w->active = 0;
519	/* nop */
520	}	755	}
521		756
		757	/*****************************************************************************/
		758
522	void	759	void
523	evio_start (struct ev_io *w)	760	ev_io_start (struct ev_io *w)
524	{	761	{
525	if (ev_is_active (w))	762	if (ev_is_active (w))
526	return;	763	return;
527		764
528	int fd = w->fd;	765	int fd = w->fd;
529		766
530	ev_start ((struct ev_watcher *)w, 1);	767	ev_start ((W)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	768	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	769	wlist_add ((WL *)&anfds[fd].head, (WL)w);
533		770
534	++fdchangecnt;	771	fd_change (fd);
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}	772	}
538		773
539	void	774	void
540	evio_stop (struct ev_io *w)	775	ev_io_stop (struct ev_io *w)
541	{	776	{
		777	ev_clear ((W)w);
542	if (!ev_is_active (w))	778	if (!ev_is_active (w))
543	return;	779	return;
544		780
545	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	781	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
546	ev_stop ((struct ev_watcher *)w);	782	ev_stop ((W)w);
547		783
548	++fdchangecnt;	784	fd_change (w->fd);
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}	785	}
552		786
553	void	787	void
554	evtimer_start (struct ev_timer *w)	788	ev_timer_start (struct ev_timer *w)
555	{	789	{
		790	if (ev_is_active (w))
		791	return;
		792
		793	w->at += now;
		794
		795	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
		796
		797	ev_start ((W)w, ++timercnt);
		798	array_needsize (timers, timermax, timercnt, );
		799	timers [timercnt - 1] = w;
		800	upheap ((WT *)timers, timercnt - 1);
		801	}
		802
		803	void
		804	ev_timer_stop (struct ev_timer *w)
		805	{
		806	ev_clear ((W)w);
556	if (ev_is_active (w))	807	if (!ev_is_active (w))
557	return;	808	return;
558		809
559	if (w->is_abs)	810	if (w->active < timercnt--)
		811	{
		812	timers [w->active - 1] = timers [timercnt];
		813	downheap ((WT *)timers, timercnt, w->active - 1);
560	{	814	}
561	/* this formula differs from the one in timer_reify becuse we do not round up */	815
		816	w->at = w->repeat;
		817
		818	ev_stop ((W)w);
		819	}
		820
		821	void
		822	ev_timer_again (struct ev_timer *w)
		823	{
		824	if (ev_is_active (w))
		825	{
562	if (w->repeat)	826	if (w->repeat)
		827	{
		828	w->at = now + w->repeat;
		829	downheap ((WT *)timers, timercnt, w->active - 1);
		830	}
		831	else
		832	ev_timer_stop (w);
		833	}
		834	else if (w->repeat)
		835	ev_timer_start (w);
		836	}
		837
		838	void
		839	ev_periodic_start (struct ev_periodic *w)
		840	{
		841	if (ev_is_active (w))
		842	return;
		843
		844	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
		845
		846	/* this formula differs from the one in periodic_reify because we do not always round up */
		847	if (w->interval)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	848	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
564		849
565	ev_start ((struct ev_watcher *)w, ++atimercnt);	850	ev_start ((W)w, ++periodiccnt);
566	array_needsize (atimers, atimermax, atimercnt, );	851	array_needsize (periodics, periodicmax, periodiccnt, );
567	atimers [atimercnt - 1] = w;	852	periodics [periodiccnt - 1] = w;
568	upheap (atimers, atimercnt - 1);	853	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	}	854	}
581		855
582	void	856	void
583	evtimer_stop (struct ev_timer *w)	857	ev_periodic_stop (struct ev_periodic *w)
584	{	858	{
		859	ev_clear ((W)w);
585	if (!ev_is_active (w))	860	if (!ev_is_active (w))
586	return;	861	return;
587		862
588	if (w->is_abs)
589	{
590	if (w->active < atimercnt--)	863	if (w->active < periodiccnt--)
591	{
592	atimers [w->active - 1] = atimers [atimercnt];
593	downheap (atimers, atimercnt, w->active - 1);
594	}
595	}	864	{
596	else	865	periodics [w->active - 1] = periodics [periodiccnt];
		866	downheap ((WT *)periodics, periodiccnt, w->active - 1);
597	{	867	}
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		868
605	ev_stop ((struct ev_watcher *)w);	869	ev_stop ((W)w);
606	}	870	}
607		871
608	void	872	void
609	evsignal_start (struct ev_signal *w)	873	ev_signal_start (struct ev_signal *w)
610	{	874	{
611	if (ev_is_active (w))	875	if (ev_is_active (w))
612	return;	876	return;
613		877
614	ev_start ((struct ev_watcher *)w, 1);	878	ev_start ((W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	879	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);	880	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
617		881
618	if (!w->next)	882	if (!w->next)
619	{	883	{
620	struct sigaction sa;	884	struct sigaction sa;
621	sa.sa_handler = sighandler;	885	sa.sa_handler = sighandler;
…		…
624	sigaction (w->signum, &sa, 0);	888	sigaction (w->signum, &sa, 0);
625	}	889	}
626	}	890	}
627		891
628	void	892	void
629	evsignal_stop (struct ev_signal *w)	893	ev_signal_stop (struct ev_signal *w)
630	{	894	{
		895	ev_clear ((W)w);
631	if (!ev_is_active (w))	896	if (!ev_is_active (w))
632	return;	897	return;
633		898
634	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);	899	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
635	ev_stop ((struct ev_watcher *)w);	900	ev_stop ((W)w);
636		901
637	if (!signals [w->signum - 1].head)	902	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	903	signal (w->signum, SIG_DFL);
639	}	904	}
640		905
		906	void
		907	ev_idle_start (struct ev_idle *w)
		908	{
		909	if (ev_is_active (w))
		910	return;
		911
		912	ev_start ((W)w, ++idlecnt);
		913	array_needsize (idles, idlemax, idlecnt, );
		914	idles [idlecnt - 1] = w;
		915	}
		916
		917	void
		918	ev_idle_stop (struct ev_idle *w)
		919	{
		920	ev_clear ((W)w);
		921	if (ev_is_active (w))
		922	return;
		923
		924	idles [w->active - 1] = idles [--idlecnt];
		925	ev_stop ((W)w);
		926	}
		927
		928	void
		929	ev_prepare_start (struct ev_prepare *w)
		930	{
		931	if (ev_is_active (w))
		932	return;
		933
		934	ev_start ((W)w, ++preparecnt);
		935	array_needsize (prepares, preparemax, preparecnt, );
		936	prepares [preparecnt - 1] = w;
		937	}
		938
		939	void
		940	ev_prepare_stop (struct ev_prepare *w)
		941	{
		942	ev_clear ((W)w);
		943	if (ev_is_active (w))
		944	return;
		945
		946	prepares [w->active - 1] = prepares [--preparecnt];
		947	ev_stop ((W)w);
		948	}
		949
		950	void
		951	ev_check_start (struct ev_check *w)
		952	{
		953	if (ev_is_active (w))
		954	return;
		955
		956	ev_start ((W)w, ++checkcnt);
		957	array_needsize (checks, checkmax, checkcnt, );
		958	checks [checkcnt - 1] = w;
		959	}
		960
		961	void
		962	ev_check_stop (struct ev_check *w)
		963	{
		964	ev_clear ((W)w);
		965	if (ev_is_active (w))
		966	return;
		967
		968	checks [w->active - 1] = checks [--checkcnt];
		969	ev_stop ((W)w);
		970	}
		971
		972	void
		973	ev_child_start (struct ev_child *w)
		974	{
		975	if (ev_is_active (w))
		976	return;
		977
		978	ev_start ((W)w, 1);
		979	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		980	}
		981
		982	void
		983	ev_child_stop (struct ev_child *w)
		984	{
		985	ev_clear ((W)w);
		986	if (ev_is_active (w))
		987	return;
		988
		989	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		990	ev_stop ((W)w);
		991	}
		992
641	/*****************************************************************************/	993	/*****************************************************************************/
		994
		995	struct ev_once
		996	{
		997	struct ev_io io;
		998	struct ev_timer to;
		999	void (cb)(int revents, void arg);
		1000	void *arg;
		1001	};
		1002
		1003	static void
		1004	once_cb (struct ev_once *once, int revents)
		1005	{
		1006	void (cb)(int revents, void arg) = once->cb;
		1007	void *arg = once->arg;
		1008
		1009	ev_io_stop (&once->io);
		1010	ev_timer_stop (&once->to);
		1011	free (once);
		1012
		1013	cb (revents, arg);
		1014	}
		1015
		1016	static void
		1017	once_cb_io (struct ev_io *w, int revents)
		1018	{
		1019	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1020	}
		1021
		1022	static void
		1023	once_cb_to (struct ev_timer *w, int revents)
		1024	{
		1025	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1026	}
		1027
		1028	void
		1029	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1030	{
		1031	struct ev_once *once = malloc (sizeof (struct ev_once));
		1032
		1033	if (!once)
		1034	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1035	else
		1036	{
		1037	once->cb = cb;
		1038	once->arg = arg;
		1039
		1040	ev_watcher_init (&once->io, once_cb_io);
		1041	if (fd >= 0)
		1042	{
		1043	ev_io_set (&once->io, fd, events);
		1044	ev_io_start (&once->io);
		1045	}
		1046
		1047	ev_watcher_init (&once->to, once_cb_to);
		1048	if (timeout >= 0.)
		1049	{
		1050	ev_timer_set (&once->to, timeout, 0.);
		1051	ev_timer_start (&once->to);
		1052	}
		1053	}
		1054	}
		1055
		1056	/*****************************************************************************/
		1057
642	#if 1	1058	#if 0
		1059
		1060	struct ev_io wio;
643		1061
644	static void	1062	static void
645	sin_cb (struct ev_io *w, int revents)	1063	sin_cb (struct ev_io *w, int revents)
646	{	1064	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1065	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
649		1067
650	static void	1068	static void
651	ocb (struct ev_timer *w, int revents)	1069	ocb (struct ev_timer *w, int revents)
652	{	1070	{
653	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1071	//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);	1072	ev_timer_stop (w);
655	evtimer_start (w);	1073	ev_timer_start (w);
656	}	1074	}
657		1075
658	static void	1076	static void
659	scb (struct ev_signal *w, int revents)	1077	scb (struct ev_signal *w, int revents)
660	{	1078	{
661	fprintf (stderr, "signal %x,%d\n", revents, w->signum);	1079	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1080	ev_io_stop (&wio);
		1081	ev_io_start (&wio);
		1082	}
		1083
		1084	static void
		1085	gcb (struct ev_signal *w, int revents)
		1086	{
		1087	fprintf (stderr, "generic %x\n", revents);
		1088
662	}	1089	}
663		1090
664	int main (void)	1091	int main (void)
665	{	1092	{
666	struct ev_io sin;
667
668	ev_init (0);	1093	ev_init (0);
669		1094
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);	1095	ev_io_init (&wio, sin_cb, 0, EV_READ);
672	evio_start (&sin);	1096	ev_io_start (&wio);
673		1097
674	struct ev_timer t[10000];	1098	struct ev_timer t[10000];
675		1099
676	#if 0	1100	#if 0
677	int i;	1101	int i;
678	for (i = 0; i < 10000; ++i)	1102	for (i = 0; i < 10000; ++i)
679	{	1103	{
680	struct ev_timer *w = t + i;	1104	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);	1105	ev_watcher_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);	1106	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
683	evtimer_start (w);	1107	ev_timer_start (w);
684	if (drand48 () < 0.5)	1108	if (drand48 () < 0.5)
685	evtimer_stop (w);	1109	ev_timer_stop (w);
686	}	1110	}
687	#endif	1111	#endif
688		1112
689	struct ev_timer t1;	1113	struct ev_timer t1;
690	evw_init (&t1, ocb, 0);	1114	ev_timer_init (&t1, ocb, 5, 10);
691	evtimer_set_abs (&t1, 5, 10);
692	evtimer_start (&t1);	1115	ev_timer_start (&t1);
693		1116
694	struct ev_signal sig;	1117	struct ev_signal sig;
695	evw_init (&sig, scb, 65535);
696	evsignal_set (&sig, SIGQUIT);	1118	ev_signal_init (&sig, scb, SIGQUIT);
697	evsignal_start (&sig);	1119	ev_signal_start (&sig);
		1120
		1121	struct ev_check cw;
		1122	ev_check_init (&cw, gcb);
		1123	ev_check_start (&cw);
		1124
		1125	struct ev_idle iw;
		1126	ev_idle_init (&iw, gcb);
		1127	ev_idle_start (&iw);
698		1128
699	ev_loop (0);	1129	ev_loop (0);
700		1130
701	return 0;	1131	return 0;
702	}	1132	}

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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 1.32 by root, Thu Nov 1 09:21:51 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 1.32 by root, Thu Nov 1 09:21:51 2007 UTC