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

Comparing libev/ev.c (file contents):
Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs.
Revision 1.32 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>
		35	#include <unistd.h>
		36	#include <fcntl.h>
		37	#include <signal.h>
		38	#include <stddef.h>
3		39
4	#include <stdio.h>	40	#include <stdio.h>
5		41
6	#include <assert.h>	42	#include <assert.h>
7	#include <errno.h>	43	#include <errno.h>
		44	#include <sys/types.h>
		45	#include <sys/wait.h>
8	#include <sys/time.h>	46	#include <sys/time.h>
9	#include <time.h>	47	#include <time.h>
10		48
		49	#ifndef EV_USE_MONOTONIC
11	#ifdef CLOCK_MONOTONIC	50	# ifdef CLOCK_MONOTONIC
12	# define HAVE_MONOTONIC 1	51	# define EV_USE_MONOTONIC 1
13	#endif	52	# endif
		53	#endif
14		54
15	#define HAVE_REALTIME 1	55	#ifndef EV_USE_SELECT
16	#define HAVE_EPOLL 1
17	#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
18		69
19	#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) */
20	#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 */
21		74
22	#include "ev.h"	75	#include "ev.h"
23		76
24	struct ev_watcher {	77	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	78	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	79	typedef struct ev_watcher_time *WT;
30	};
31		80
32	static ev_tstamp now, diff; /* monotonic clock */	81	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	82	ev_tstamp ev_now;
34	int ev_method;	83	int ev_method;
35		84
37		86
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	87	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
39	static void (*method_modify)(int fd, int oev, int nev);	88	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);	89	static void (*method_poll)(ev_tstamp timeout);
41		90
		91	/*****************************************************************************/
		92
42	ev_tstamp	93	ev_tstamp
43	ev_time (void)	94	ev_time (void)
44	{	95	{
45	#if HAVE_REALTIME	96	#if EV_USE_REALTIME
46	struct timespec ts;	97	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	98	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	99	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	100	#else
50	struct timeval tv;	101	struct timeval tv;
…		…
54	}	105	}
55		106
56	static ev_tstamp	107	static ev_tstamp
57	get_clock (void)	108	get_clock (void)
58	{	109	{
59	#if HAVE_MONOTONIC	110	#if EV_USE_MONOTONIC
60	if (have_monotonic)	111	if (have_monotonic)
61	{	112	{
62	struct timespec ts;	113	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	114	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	115	return ts.tv_sec + ts.tv_nsec * 1e-9;
…		…
66	#endif	117	#endif
67		118
68	return ev_time ();	119	return ev_time ();
69	}	120	}
70		121
		122	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		123
71	#define array_needsize(base,cur,cnt,init) \	124	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	125	if ((cnt) > cur) \
73	{ \	126	{ \
74	int newcnt = cur ? cur << 1 : 16; \	127	int newcnt = cur; \
75	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	\
76	base = realloc (base, sizeof (base) (newcnt)); \	134	base = realloc (base, sizeof (base) (newcnt)); \
77	init (base + cur, newcnt - cur); \	135	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	136	cur = newcnt; \
79	}	137	}
80		138
		139	/*****************************************************************************/
		140
81	typedef struct	141	typedef struct
82	{	142	{
83	struct ev_io *head;	143	struct ev_io *head;
84	unsigned char wev, rev; /* want, received event set */	144	int events;
85	} ANFD;	145	} ANFD;
86		146
87	static ANFD *anfds;	147	static ANFD *anfds;
88	static int anfdmax;	148	static int anfdmax;
89		149
90	static int *fdchanges;
91	static int fdchangemax, fdchangecnt;
92
93	static void	150	static void
94	anfds_init (ANFD *base, int count)	151	anfds_init (ANFD *base, int count)
95	{	152	{
96	while (count--)	153	while (count--)
97	{	154	{
98	base->head = 0;	155	base->head = 0;
99	base->wev = base->rev = EV_NONE;	156	base->events = EV_NONE;
100	++base;	157	++base;
101	}	158	}
102	}	159	}
103		160
104	typedef struct	161	typedef struct
105	{	162	{
106	struct ev_watcher *w;	163	W w;
107	int events;	164	int events;
108	} ANPENDING;	165	} ANPENDING;
109		166
110	static ANPENDING *pendings;	167	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;	168	static int pendingmax, pendingcnt;
112		169
113	static void	170	static void
114	event (struct ev_watcher *w, int events)	171	event (W w, int events)
115	{	172	{
		173	if (w->pending)
		174	{
		175	pendings [w->pending - 1].events \|= events;
		176	return;
		177	}
		178
116	w->pending = ++pendingcnt;	179	w->pending = ++pendingcnt;
117	array_needsize (pendings, pendingmax, pendingcnt, );	180	array_needsize (pendings, pendingmax, pendingcnt, );
118	pendings [pendingcnt - 1].w = w;	181	pendings [pendingcnt - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	182	pendings [pendingcnt - 1].events = events;
120	}	183	}
121		184
122	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
123	fd_event (int fd, int events)	195	fd_event (int fd, int events)
124	{	196	{
125	ANFD *anfd = anfds + fd;	197	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	198	struct ev_io *w;
127		199
128	for (w = anfd->head; w; w = w->next)	200	for (w = anfd->head; w; w = w->next)
129	{	201	{
130	int ev = w->events & events;	202	int ev = w->events & events;
131		203
132	if (ev)	204	if (ev)
133	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)
134	}	220	{
135	}	221	int fd = fdchanges [i];
		222	ANFD *anfd = anfds + fd;
		223	struct ev_io *w;
136		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
137	static struct ev_timer **atimers;	273	static struct ev_timer **timers;
138	static int atimermax, atimercnt;	274	static int timermax, timercnt;
139		275
140	static struct ev_timer **rtimers;	276	static struct ev_periodic **periodics;
141	static int rtimermax, rtimercnt;	277	static int periodicmax, periodiccnt;
142		278
143	static void	279	static void
144	upheap (struct ev_timer **timers, int k)	280	upheap (WT *timers, int k)
145	{	281	{
146	struct ev_timer *w = timers [k];	282	WT w = timers [k];
147		283
148	while (k && timers [k >> 1]->at > w->at)	284	while (k && timers [k >> 1]->at > w->at)
149	{	285	{
150	timers [k] = timers [k >> 1];	286	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;	287	timers [k]->active = k + 1;
…		…
156	timers [k]->active = k + 1;	292	timers [k]->active = k + 1;
157		293
158	}	294	}
159		295
160	static void	296	static void
161	downheap (struct ev_timer **timers, int N, int k)	297	downheap (WT *timers, int N, int k)
162	{	298	{
163	struct ev_timer *w = timers [k];	299	WT w = timers [k];
164		300
165	while (k < (N >> 1))	301	while (k < (N >> 1))
166	{	302	{
167	int j = k << 1;	303	int j = k << 1;
168		304
…		…
179		315
180	timers [k] = w;	316	timers [k] = w;
181	timers [k]->active = k + 1;	317	timers [k]->active = k + 1;
182	}	318	}
183		319
184	static struct ev_signal **signals;	320	/*****************************************************************************/
		321
		322	typedef struct
		323	{
		324	struct ev_signal *head;
		325	sig_atomic_t gotsig;
		326	} ANSIG;
		327
		328	static ANSIG *signals;
185	static int signalmax;	329	static int signalmax;
186		330
		331	static int sigpipe [2];
		332	static sig_atomic_t gotsig;
		333	static struct ev_io sigev;
		334
187	static void	335	static void
188	signals_init (struct ev_signal **base, int count)	336	signals_init (ANSIG *base, int count)
189	{	337	{
190	while (count--)	338	while (count--)
191	*base++ = 0;	339	{
		340	base->head = 0;
		341	base->gotsig = 0;
		342	++base;
		343	}
192	}	344	}
193		345
		346	static void
		347	sighandler (int signum)
		348	{
		349	signals [signum - 1].gotsig = 1;
		350
		351	if (!gotsig)
		352	{
		353	gotsig = 1;
		354	write (sigpipe [1], &gotsig, 1);
		355	}
		356	}
		357
		358	static void
		359	sigcb (struct ev_io *iow, int revents)
		360	{
		361	struct ev_signal *w;
		362	int sig;
		363
		364	gotsig = 0;
		365	read (sigpipe [0], &revents, 1);
		366
		367	for (sig = signalmax; sig--; )
		368	if (signals [sig].gotsig)
		369	{
		370	signals [sig].gotsig = 0;
		371
		372	for (w = signals [sig].head; w; w = w->next)
		373	event ((W)w, EV_SIGNAL);
		374	}
		375	}
		376
		377	static void
		378	siginit (void)
		379	{
		380	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		381	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		382
		383	/* rather than sort out wether we really need nb, set it */
		384	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		385	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		386
		387	ev_io_set (&sigev, sigpipe [0], EV_READ);
		388	ev_io_start (&sigev);
		389	}
		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
194	#if HAVE_EPOLL	428	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	429	# include "ev_epoll.c"
196	#endif	430	#endif
197	#if HAVE_SELECT	431	#if EV_USE_SELECT
198	# include "ev_select.c"	432	# include "ev_select.c"
199	#endif	433	#endif
200		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
201	int ev_init (int flags)	447	int ev_init (int flags)
202	{	448	{
		449	if (!ev_method)
		450	{
203	#if HAVE_MONOTONIC	451	#if EV_USE_MONOTONIC
204	{	452	{
205	struct timespec ts;	453	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	454	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	455	have_monotonic = 1;
208	}	456	}
209	#endif	457	#endif
210		458
211	ev_now = ev_time ();	459	ev_now = ev_time ();
212	now = get_clock ();	460	now = get_clock ();
213	diff = ev_now - now;	461	diff = ev_now - now;
214		462
215	#if HAVE_EPOLL	463	if (pipe (sigpipe))
216	if (epoll_init (flags))	464	return 0;
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223		465
224	ev_method = EVMETHOD_NONE;	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	{
		476	ev_watcher_init (&sigev, sigcb);
		477	siginit ();
		478
		479	ev_signal_init (&childev, childcb, SIGCHLD);
		480	ev_signal_start (&childev);
		481	}
		482	}
		483
225	return ev_method;	484	return ev_method;
226	}	485	}
227		486
		487	/*****************************************************************************/
		488
		489	void
228	void ev_prefork (void)	490	ev_prefork (void)
229	{	491	{
		492	/* nop */
230	}	493	}
231		494
		495	void
232	void ev_postfork_parent (void)	496	ev_postfork_parent (void)
233	{	497	{
		498	/* nop */
234	}	499	}
235		500
		501	void
236	void ev_postfork_child (void)	502	ev_postfork_child (void)
237	{	503	{
238	#if HAVE_EPOLL	504	#if EV_USE_EPOLL
239	if (ev_method == EVMETHOD_EPOLL)	505	if (ev_method == EVMETHOD_EPOLL)
240	epoll_postfork_child ();	506	epoll_postfork_child ();
241	#endif	507	#endif
242	}
243		508
244	static void	509	ev_io_stop (&sigev);
245	fd_reify (void)	510	close (sigpipe [0]);
246	{	511	close (sigpipe [1]);
247	int i;	512	pipe (sigpipe);
248		513	siginit ();
249	for (i = 0; i < fdchangecnt; ++i)
250	{
251	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;
253	struct ev_io *w;
254
255	int wev = 0;
256
257	for (w = anfd->head; w; w = w->next)
258	wev \|= w->events;
259
260	if (anfd->wev != wev)
261	{
262	method_modify (fd, anfd->wev, wev);
263	anfd->wev = wev;
264	}
265	}
266
267	fdchangecnt = 0;
268	}	514	}
269		515
		516	/*****************************************************************************/
		517
270	static void	518	static void
271	call_pending ()	519	call_pending (void)
272	{	520	{
273	int i;	521	while (pendingcnt)
274
275	for (i = 0; i < pendingcnt; ++i)
276	{	522	{
277	ANPENDING *p = pendings + i;	523	ANPENDING *p = pendings + --pendingcnt;
278		524
279	if (p->w)	525	if (p->w)
280	{	526	{
281	p->w->pending = 0;	527	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	528	p->w->cb (p->w, p->events);
283	}	529	}
284	}	530	}
285
286	pendingcnt = 0;
287	}	531	}
288		532
289	static void	533	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	534	timers_reify (void)
291	{	535	{
292	while (timercnt && timers [0]->at <= now)	536	while (timercnt && timers [0]->at <= now)
293	{	537	{
294	struct ev_timer *w = timers [0];	538	struct ev_timer *w = timers [0];
295		539
296	/* first reschedule or stop timer */	540	/* first reschedule or stop timer */
297	if (w->repeat)	541	if (w->repeat)
298	{	542	{
299	if (w->is_abs)
300	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
301	else
302	w->at = now + w->repeat;	543	w->at = now + w->repeat;
303		544	assert (("timer timeout in the past, negative repeat?", w->at > now));
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	545	downheap ((WT *)timers, timercnt, 0);
307	}	546	}
308	else	547	else
309	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	548	ev_timer_stop (w); /* nonrepeating: stop timer */
311	--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)
312	}	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 */
313		570
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	571	event ((W)w, EV_TIMEOUT);
315	}	572	}
316	}	573	}
317		574
318	static void	575	static void
319	time_update ()	576	periodics_reschedule (ev_tstamp diff)
320	{	577	{
321	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
322	ev_now = ev_time ();	605	ev_now = ev_time ();
323		606
324	if (have_monotonic)	607	if (have_monotonic)
325	{	608	{
326	ev_tstamp odiff = diff;	609	ev_tstamp odiff = diff;
327		610
328	/* detecting time jumps is much more difficult */
329	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 */
330	{	612	{
331	now = get_clock ();	613	now = get_clock ();
332	diff = ev_now - now;	614	diff = ev_now - now;
333		615
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	616	if (fabs (odiff - diff) < MIN_TIMEJUMP)
335	return; /* all is well */	617	return; /* all is well */
336		618
337	ev_now = ev_time ();	619	ev_now = ev_time ();
338	}	620	}
339		621
340	/* time jump detected, reschedule atimers */	622	periodics_reschedule (diff - odiff);
341	for (i = 0; i < atimercnt; ++i)	623	/* no timer adjustment, as the monotonic clock doesn't jump */
342	{
343	struct ev_timer *w = atimers [i];
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
345	}
346	}	624	}
347	else	625	else
348	{	626	{
349	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	627	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
350	/* 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 */
351	for (i = 0; i < rtimercnt; ++i)	632	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	633	timers [i]->at += diff;
		634	}
353		635
354	now = ev_now;	636	now = ev_now;
355	}	637	}
356	}	638	}
357		639
358	int ev_loop_done;	640	int ev_loop_done;
359		641
360	void ev_loop (int flags)	642	void ev_loop (int flags)
361	{	643	{
362	double block;	644	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	645	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
364		646
365	do	647	do
366	{	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
367	/* update fd-related kernel structures */	656	/* update fd-related kernel structures */
368	fd_reify ();	657	fd_reify ();
369		658
370	/* 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
371	if (flags & EVLOOP_NONBLOCK)	665	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
372	block = 0.;	666	block = 0.;
373	else	667	else
374	{	668	{
375	block = MAX_BLOCKTIME;	669	block = MAX_BLOCKTIME;
376		670
377	if (rtimercnt)	671	if (timercnt)
378	{	672	{
379	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;
380	if (block > to) block = to;	674	if (block > to) block = to;
381	}	675	}
382		676
383	if (atimercnt)	677	if (periodiccnt)
384	{	678	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	679	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
386	if (block > to) block = to;	680	if (block > to) block = to;
387	}	681	}
388		682
389	if (block < 0.) block = 0.;	683	if (block < 0.) block = 0.;
390	}	684	}
…		…
392	method_poll (block);	686	method_poll (block);
393		687
394	/* update ev_now, do magic */	688	/* update ev_now, do magic */
395	time_update ();	689	time_update ();
396		690
397	/* put pending timers into pendign queue and reschedule them */	691	/* queue pending timers and reschedule them */
398	/* absolute timers first */	692	timers_reify (); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	693	periodics_reify (); /* absolute timers called first */
400	/* relative timers second */	694
401	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);
402		702
403	call_pending ();	703	call_pending ();
404	}	704	}
405	while (!ev_loop_done);	705	while (!ev_loop_done);
406	}
407		706
		707	if (ev_loop_done != 2)
		708	ev_loop_done = 0;
		709	}
		710
		711	/*****************************************************************************/
		712
408	static void	713	static void
409	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	714	wlist_add (WL *head, WL elem)
410	{	715	{
411	elem->next = *head;	716	elem->next = *head;
412	*head = elem;	717	*head = elem;
413	}	718	}
414		719
415	static void	720	static void
416	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	721	wlist_del (WL *head, WL elem)
417	{	722	{
418	while (*head)	723	while (*head)
419	{	724	{
420	if (*head == elem)	725	if (*head == elem)
421	{	726	{
…		…
426	head = &(*head)->next;	731	head = &(*head)->next;
427	}	732	}
428	}	733	}
429		734
430	static void	735	static void
431	ev_start (struct ev_watcher *w, int active)	736	ev_clear (W w)
432	{	737	{
		738	if (w->pending)
		739	{
		740	pendings [w->pending - 1].w = 0;
433	w->pending = 0;	741	w->pending = 0;
		742	}
		743	}
		744
		745	static void
		746	ev_start (W w, int active)
		747	{
434	w->active = active;	748	w->active = active;
435	}	749	}
436		750
437	static void	751	static void
438	ev_stop (struct ev_watcher *w)	752	ev_stop (W w)
439	{	753	{
440	if (w->pending)
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	754	w->active = 0;
444	/* nop */
445	}	755	}
446		756
		757	/*****************************************************************************/
		758
447	void	759	void
448	evio_start (struct ev_io *w)	760	ev_io_start (struct ev_io *w)
449	{	761	{
450	if (ev_is_active (w))	762	if (ev_is_active (w))
451	return;	763	return;
452		764
453	int fd = w->fd;	765	int fd = w->fd;
454		766
455	ev_start ((struct ev_watcher *)w, 1);	767	ev_start ((W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	768	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	769	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		770
459	++fdchangecnt;	771	fd_change (fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	772	}
463		773
464	void	774	void
465	evio_stop (struct ev_io *w)	775	ev_io_stop (struct ev_io *w)
466	{	776	{
		777	ev_clear ((W)w);
467	if (!ev_is_active (w))	778	if (!ev_is_active (w))
468	return;	779	return;
469		780
470	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);
471	ev_stop ((struct ev_watcher *)w);	782	ev_stop ((W)w);
472		783
473	++fdchangecnt;	784	fd_change (w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	785	}
477		786
478	void	787	void
479	evtimer_start (struct ev_timer *w)	788	ev_timer_start (struct ev_timer *w)
480	{	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);
481	if (ev_is_active (w))	807	if (!ev_is_active (w))
482	return;	808	return;
483		809
484	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);
485	{	814	}
486	/* 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	{
487	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)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	848	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
489		849
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	850	ev_start ((W)w, ++periodiccnt);
491	array_needsize (atimers, atimermax, atimercnt, );	851	array_needsize (periodics, periodicmax, periodiccnt, );
492	atimers [atimercnt - 1] = w;	852	periodics [periodiccnt - 1] = w;
493	upheap (atimers, atimercnt - 1);	853	upheap ((WT *)periodics, periodiccnt - 1);
		854	}
		855
		856	void
		857	ev_periodic_stop (struct ev_periodic *w)
		858	{
		859	ev_clear ((W)w);
		860	if (!ev_is_active (w))
		861	return;
		862
		863	if (w->active < periodiccnt--)
494	}	864	{
		865	periodics [w->active - 1] = periodics [periodiccnt];
		866	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		867	}
		868
		869	ev_stop ((W)w);
		870	}
		871
		872	void
		873	ev_signal_start (struct ev_signal *w)
		874	{
		875	if (ev_is_active (w))
		876	return;
		877
		878	ev_start ((W)w, 1);
		879	array_needsize (signals, signalmax, w->signum, signals_init);
		880	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		881
		882	if (!w->next)
		883	{
		884	struct sigaction sa;
		885	sa.sa_handler = sighandler;
		886	sigfillset (&sa.sa_mask);
		887	sa.sa_flags = 0;
		888	sigaction (w->signum, &sa, 0);
		889	}
		890	}
		891
		892	void
		893	ev_signal_stop (struct ev_signal *w)
		894	{
		895	ev_clear ((W)w);
		896	if (!ev_is_active (w))
		897	return;
		898
		899	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		900	ev_stop ((W)w);
		901
		902	if (!signals [w->signum - 1].head)
		903	signal (w->signum, SIG_DFL);
		904	}
		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
		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);
495	else	1035	else
496	{	1036	{
497	w->at += now;	1037	once->cb = cb;
		1038	once->arg = arg;
498		1039
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1040	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1041	if (fd >= 0)
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504
505	}
506
507	void
508	evtimer_stop (struct ev_timer *w)
509	{
510	if (!ev_is_active (w))
511	return;
512
513	if (w->is_abs)
514	{
515	if (w->active < atimercnt--)
516	{
517	atimers [w->active - 1] = atimers [atimercnt];
518	downheap (atimers, atimercnt, w->active - 1);
519	}	1042	{
520	}	1043	ev_io_set (&once->io, fd, events);
521	else	1044	ev_io_start (&once->io);
522	{
523	if (w->active < rtimercnt--)
524	{	1045	}
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1046
526	downheap (rtimers, rtimercnt, w->active - 1);	1047	ev_watcher_init (&once->to, once_cb_to);
		1048	if (timeout >= 0.)
527	}	1049	{
		1050	ev_timer_set (&once->to, timeout, 0.);
		1051	ev_timer_start (&once->to);
		1052	}
528	}	1053	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1054	}
532		1055
533	void
534	evsignal_start (struct ev_signal *w)
535	{
536	if (ev_is_active (w))
537	return;
538
539	ev_start ((struct ev_watcher *)w, 1);
540	array_needsize (signals, signalmax, w->signum, signals_init);
541	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
542	}
543
544	void
545	evsignal_stop (struct ev_signal *w)
546	{
547	if (!ev_is_active (w))
548	return;
549
550	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
551	ev_stop ((struct ev_watcher *)w);
552	}
553
554	/*****************************************************************************/	1056	/*****************************************************************************/
		1057
555	#if 1	1058	#if 0
		1059
		1060	struct ev_io wio;
556		1061
557	static void	1062	static void
558	sin_cb (struct ev_io *w, int revents)	1063	sin_cb (struct ev_io *w, int revents)
559	{	1064	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1065	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
562		1067
563	static void	1068	static void
564	ocb (struct ev_timer *w, int revents)	1069	ocb (struct ev_timer *w, int revents)
565	{	1070	{
566	//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);
567	evtimer_stop (w);	1072	ev_timer_stop (w);
568	evtimer_start (w);	1073	ev_timer_start (w);
		1074	}
		1075
		1076	static void
		1077	scb (struct ev_signal *w, int revents)
		1078	{
		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
569	}	1089	}
570		1090
571	int main (void)	1091	int main (void)
572	{	1092	{
573	struct ev_io sin;
574
575	ev_init (0);	1093	ev_init (0);
576		1094
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);	1095	ev_io_init (&wio, sin_cb, 0, EV_READ);
579	evio_start (&sin);	1096	ev_io_start (&wio);
580		1097
581	struct ev_timer t[10000];	1098	struct ev_timer t[10000];
582		1099
583	#if 1	1100	#if 0
584	int i;	1101	int i;
585	for (i = 0; i < 10000; ++i)	1102	for (i = 0; i < 10000; ++i)
586	{	1103	{
587	struct ev_timer *w = t + i;	1104	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);	1105	ev_watcher_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);	1106	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
590	evtimer_start (w);	1107	ev_timer_start (w);
591	if (drand48 () < 0.5)	1108	if (drand48 () < 0.5)
592	evtimer_stop (w);	1109	ev_timer_stop (w);
593	}	1110	}
594	#endif	1111	#endif
595		1112
596	struct ev_timer t1;	1113	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);	1114	ev_timer_init (&t1, ocb, 5, 10);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);	1115	ev_timer_start (&t1);
		1116
		1117	struct ev_signal sig;
		1118	ev_signal_init (&sig, scb, SIGQUIT);
		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);
600		1128
601	ev_loop (0);	1129	ev_loop (0);
602		1130
603	return 0;	1131	return 0;
604	}	1132	}

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing libev/ev.c (file contents): Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs. Revision 1.32 by root, Thu Nov 1 09:21:51 2007 UTC

Diff Legend

Comparing libev/ev.c (file contents):
Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs.
Revision 1.32 by root, Thu Nov 1 09:21:51 2007 UTC