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

Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.34 by root, Thu Nov 1 11:43:11 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_EPOLL 1	55	#ifndef EV_USE_SELECT
16	#define HAVE_REALTIME 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	unsigned char events;
		145	unsigned char reify;
85	} ANFD;	146	} ANFD;
86		147
87	static ANFD *anfds;	148	static ANFD *anfds;
88	static int anfdmax;	149	static int anfdmax;
89		150
90	static int *fdchanges;
91	static int fdchangemax, fdchangecnt;
92
93	static void	151	static void
94	anfds_init (ANFD *base, int count)	152	anfds_init (ANFD *base, int count)
95	{	153	{
96	while (count--)	154	while (count--)
97	{	155	{
98	base->head = 0;	156	base->head = 0;
99	base->wev = base->rev = EV_NONE;	157	base->events = EV_NONE;
		158	base->reify = 0;
		159
100	++base;	160	++base;
101	}	161	}
102	}	162	}
103		163
104	typedef struct	164	typedef struct
105	{	165	{
106	struct ev_watcher *w;	166	W w;
107	int events;	167	int events;
108	} ANPENDING;	168	} ANPENDING;
109		169
110	static ANPENDING *pendings;	170	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;	171	static int pendingmax, pendingcnt;
112		172
113	static void	173	static void
114	event (struct ev_watcher *w, int events)	174	event (W w, int events)
115	{	175	{
		176	if (w->pending)
		177	{
		178	pendings [w->pending - 1].events \|= events;
		179	return;
		180	}
		181
116	w->pending = ++pendingcnt;	182	w->pending = ++pendingcnt;
117	array_needsize (pendings, pendingmax, pendingcnt, );	183	array_needsize (pendings, pendingmax, pendingcnt, );
118	pendings [pendingcnt - 1].w = w;	184	pendings [pendingcnt - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	185	pendings [pendingcnt - 1].events = events;
120	}	186	}
121		187
122	static void	188	static void
		189	queue_events (W *events, int eventcnt, int type)
		190	{
		191	int i;
		192
		193	for (i = 0; i < eventcnt; ++i)
		194	event (events [i], type);
		195	}
		196
		197	static void
123	fd_event (int fd, int events)	198	fd_event (int fd, int events)
124	{	199	{
125	ANFD *anfd = anfds + fd;	200	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	201	struct ev_io *w;
127		202
128	for (w = anfd->head; w; w = w->next)	203	for (w = anfd->head; w; w = w->next)
129	{	204	{
130	int ev = w->events & events;	205	int ev = w->events & events;
131		206
132	if (ev)	207	if (ev)
133	event ((struct ev_watcher *)w, ev);	208	event ((W)w, ev);
		209	}
		210	}
		211
		212	/*****************************************************************************/
		213
		214	static int *fdchanges;
		215	static int fdchangemax, fdchangecnt;
		216
		217	static void
		218	fd_reify (void)
		219	{
		220	int i;
		221
		222	for (i = 0; i < fdchangecnt; ++i)
134	}	223	{
135	}	224	int fd = fdchanges [i];
		225	ANFD *anfd = anfds + fd;
		226	struct ev_io *w;
136		227
		228	int events = 0;
		229
		230	for (w = anfd->head; w; w = w->next)
		231	events \|= w->events;
		232
		233	anfd->reify = 0;
		234
		235	if (anfd->events != events)
		236	{
		237	method_modify (fd, anfd->events, events);
		238	anfd->events = events;
		239	}
		240	}
		241
		242	fdchangecnt = 0;
		243	}
		244
		245	static void
		246	fd_change (int fd)
		247	{
		248	if (anfds [fd].reify \|\| fdchangecnt < 0)
		249	return;
		250
		251	anfds [fd].reify = 1;
		252
		253	++fdchangecnt;
		254	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		255	fdchanges [fdchangecnt - 1] = fd;
		256	}
		257
		258	/* called on EBADF to verify fds */
		259	static void
		260	fd_recheck (void)
		261	{
		262	int fd;
		263
		264	for (fd = 0; fd < anfdmax; ++fd)
		265	if (anfds [fd].events)
		266	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		267	while (anfds [fd].head)
		268	{
		269	ev_io_stop (anfds [fd].head);
		270	event ((W)anfds [fd].head, EV_ERROR \| EV_READ \| EV_WRITE);
		271	}
		272	}
		273
		274	/*****************************************************************************/
		275
137	static struct ev_timer **atimers;	276	static struct ev_timer **timers;
138	static int atimermax, atimercnt;	277	static int timermax, timercnt;
139		278
140	static struct ev_timer **rtimers;	279	static struct ev_periodic **periodics;
141	static int rtimermax, rtimercnt;	280	static int periodicmax, periodiccnt;
142		281
143	static void	282	static void
144	upheap (struct ev_timer **timers, int k)	283	upheap (WT *timers, int k)
145	{	284	{
146	struct ev_timer *w = timers [k];	285	WT w = timers [k];
147		286
148	while (k && timers [k >> 1]->at > w->at)	287	while (k && timers [k >> 1]->at > w->at)
149	{	288	{
150	timers [k] = timers [k >> 1];	289	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;	290	timers [k]->active = k + 1;
…		…
156	timers [k]->active = k + 1;	295	timers [k]->active = k + 1;
157		296
158	}	297	}
159		298
160	static void	299	static void
161	downheap (struct ev_timer **timers, int N, int k)	300	downheap (WT *timers, int N, int k)
162	{	301	{
163	struct ev_timer *w = timers [k];	302	WT w = timers [k];
164		303
165	while (k < (N >> 1))	304	while (k < (N >> 1))
166	{	305	{
167	int j = k << 1;	306	int j = k << 1;
168		307
…		…
179		318
180	timers [k] = w;	319	timers [k] = w;
181	timers [k]->active = k + 1;	320	timers [k]->active = k + 1;
182	}	321	}
183		322
184	static struct ev_signal **signals;	323	/*****************************************************************************/
		324
		325	typedef struct
		326	{
		327	struct ev_signal *head;
		328	sig_atomic_t volatile gotsig;
		329	} ANSIG;
		330
		331	static ANSIG *signals;
185	static int signalmax;	332	static int signalmax;
186		333
		334	static int sigpipe [2];
		335	static sig_atomic_t volatile gotsig;
		336	static struct ev_io sigev;
		337
187	static void	338	static void
188	signals_init (struct ev_signal **base, int count)	339	signals_init (ANSIG *base, int count)
189	{	340	{
190	while (count--)	341	while (count--)
191	*base++ = 0;	342	{
192	}	343	base->head = 0;
		344	base->gotsig = 0;
193		345
		346	++base;
		347	}
		348	}
		349
		350	static void
		351	sighandler (int signum)
		352	{
		353	signals [signum - 1].gotsig = 1;
		354
		355	if (!gotsig)
		356	{
		357	gotsig = 1;
		358	write (sigpipe [1], &signum, 1);
		359	}
		360	}
		361
		362	static void
		363	sigcb (struct ev_io *iow, int revents)
		364	{
		365	struct ev_signal *w;
		366	int sig;
		367
		368	read (sigpipe [0], &revents, 1);
		369	gotsig = 0;
		370
		371	for (sig = signalmax; sig--; )
		372	if (signals [sig].gotsig)
		373	{
		374	signals [sig].gotsig = 0;
		375
		376	for (w = signals [sig].head; w; w = w->next)
		377	event ((W)w, EV_SIGNAL);
		378	}
		379	}
		380
		381	static void
		382	siginit (void)
		383	{
		384	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		385	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		386
		387	/* rather than sort out wether we really need nb, set it */
		388	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		389	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		390
		391	ev_io_set (&sigev, sigpipe [0], EV_READ);
		392	ev_io_start (&sigev);
		393	}
		394
		395	/*****************************************************************************/
		396
		397	static struct ev_idle **idles;
		398	static int idlemax, idlecnt;
		399
		400	static struct ev_prepare **prepares;
		401	static int preparemax, preparecnt;
		402
		403	static struct ev_check **checks;
		404	static int checkmax, checkcnt;
		405
		406	/*****************************************************************************/
		407
		408	static struct ev_child *childs [PID_HASHSIZE];
		409	static struct ev_signal childev;
		410
		411	#ifndef WCONTINUED
		412	# define WCONTINUED 0
		413	#endif
		414
		415	static void
		416	childcb (struct ev_signal *sw, int revents)
		417	{
		418	struct ev_child *w;
		419	int pid, status;
		420
		421	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		422	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		423	if (w->pid == pid \|\| w->pid == -1)
		424	{
		425	w->status = status;
		426	event ((W)w, EV_CHILD);
		427	}
		428	}
		429
		430	/*****************************************************************************/
		431
194	#if HAVE_EPOLL	432	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	433	# include "ev_epoll.c"
196	#endif	434	#endif
197	#if HAVE_SELECT	435	#if EV_USE_SELECT
198	# include "ev_select.c"	436	# include "ev_select.c"
199	#endif	437	#endif
200		438
		439	int
		440	ev_version_major (void)
		441	{
		442	return EV_VERSION_MAJOR;
		443	}
		444
		445	int
		446	ev_version_minor (void)
		447	{
		448	return EV_VERSION_MINOR;
		449	}
		450
201	int ev_init (int flags)	451	int ev_init (int flags)
202	{	452	{
		453	if (!ev_method)
		454	{
203	#if HAVE_MONOTONIC	455	#if EV_USE_MONOTONIC
204	{	456	{
205	struct timespec ts;	457	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	458	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	459	have_monotonic = 1;
208	}	460	}
209	#endif	461	#endif
210		462
211	ev_now = ev_time ();	463	ev_now = ev_time ();
212	now = get_clock ();	464	now = get_clock ();
213	diff = ev_now - now;	465	diff = ev_now - now;
214		466
215	#if HAVE_EPOLL	467	if (pipe (sigpipe))
216	if (epoll_init (flags))	468	return 0;
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223		469
224	ev_method = EVMETHOD_NONE;	470	ev_method = EVMETHOD_NONE;
		471	#if EV_USE_EPOLL
		472	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
		473	#endif
		474	#if EV_USE_SELECT
		475	if (ev_method == EVMETHOD_NONE) select_init (flags);
		476	#endif
		477
		478	if (ev_method)
		479	{
		480	ev_watcher_init (&sigev, sigcb);
		481	siginit ();
		482
		483	ev_signal_init (&childev, childcb, SIGCHLD);
		484	ev_signal_start (&childev);
		485	}
		486	}
		487
225	return ev_method;	488	return ev_method;
226	}	489	}
227		490
		491	/*****************************************************************************/
		492
		493	void
228	void ev_prefork (void)	494	ev_prefork (void)
229	{	495	{
		496	/* nop */
230	}	497	}
231		498
		499	void
232	void ev_postfork_parent (void)	500	ev_postfork_parent (void)
233	{	501	{
		502	/* nop */
234	}	503	}
235		504
		505	void
236	void ev_postfork_child (void)	506	ev_postfork_child (void)
237	{	507	{
238	#if HAVE_EPOLL	508	#if EV_USE_EPOLL
239	if (ev_method == EVMETHOD_EPOLL)	509	if (ev_method == EVMETHOD_EPOLL)
240	epoll_postfork_child ();	510	epoll_postfork_child ();
241	#endif	511	#endif
242	}
243		512
244	static void	513	ev_io_stop (&sigev);
245	fd_reify (void)	514	close (sigpipe [0]);
246	{	515	close (sigpipe [1]);
247	int i;	516	pipe (sigpipe);
248		517	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	}	518	}
269		519
		520	/*****************************************************************************/
		521
270	static void	522	static void
271	call_pending ()	523	call_pending (void)
272	{	524	{
273	int i;	525	while (pendingcnt)
274
275	for (i = 0; i < pendingcnt; ++i)
276	{	526	{
277	ANPENDING *p = pendings + i;	527	ANPENDING *p = pendings + --pendingcnt;
278		528
279	if (p->w)	529	if (p->w)
280	{	530	{
281	p->w->pending = 0;	531	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	532	p->w->cb (p->w, p->events);
283	}	533	}
284	}	534	}
285
286	pendingcnt = 0;
287	}	535	}
288		536
289	static void	537	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	538	timers_reify (void)
291	{	539	{
292	while (timercnt && timers [0]->at <= now)	540	while (timercnt && timers [0]->at <= now)
293	{	541	{
294	struct ev_timer *w = timers [0];	542	struct ev_timer *w = timers [0];
295		543
296	/* first reschedule or stop timer */	544	/* first reschedule or stop timer */
297	if (w->repeat)	545	if (w->repeat)
298	{	546	{
299	if (w->is_abs)	547	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
300	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
301	else
302	w->at = now + w->repeat;	548	w->at = now + w->repeat;
303
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	549	downheap ((WT *)timers, timercnt, 0);
307	}	550	}
308	else	551	else
309	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	552	ev_timer_stop (w); /* nonrepeating: stop timer */
311	--timercnt; /* maybe pass by reference instead? */	553
		554	event ((W)w, EV_TIMEOUT);
		555	}
		556	}
		557
		558	static void
		559	periodics_reify (void)
		560	{
		561	while (periodiccnt && periodics [0]->at <= ev_now)
		562	{
		563	struct ev_periodic *w = periodics [0];
		564
		565	/* first reschedule or stop timer */
		566	if (w->interval)
312	}	567	{
		568	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		569	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
		570	downheap ((WT *)periodics, periodiccnt, 0);
		571	}
		572	else
		573	ev_periodic_stop (w); /* nonrepeating: stop timer */
313		574
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	575	event ((W)w, EV_PERIODIC);
315	}	576	}
316	}	577	}
317		578
318	static void	579	static void
319	time_update ()	580	periodics_reschedule (ev_tstamp diff)
320	{	581	{
321	int i;	582	int i;
		583
		584	/* adjust periodics after time jump */
		585	for (i = 0; i < periodiccnt; ++i)
		586	{
		587	struct ev_periodic *w = periodics [i];
		588
		589	if (w->interval)
		590	{
		591	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		592
		593	if (fabs (diff) >= 1e-4)
		594	{
		595	ev_periodic_stop (w);
		596	ev_periodic_start (w);
		597
		598	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		599	}
		600	}
		601	}
		602	}
		603
		604	static void
		605	time_update (void)
		606	{
		607	int i;
		608
322	ev_now = ev_time ();	609	ev_now = ev_time ();
323		610
324	if (have_monotonic)	611	if (have_monotonic)
325	{	612	{
326	ev_tstamp odiff = diff;	613	ev_tstamp odiff = diff;
327		614
328	/* detecting time jumps is much more difficult */
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	615	for (i = 4; --i; ) /* loop a few times, before making important decisions */
330	{	616	{
331	now = get_clock ();	617	now = get_clock ();
332	diff = ev_now - now;	618	diff = ev_now - now;
333		619
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	620	if (fabs (odiff - diff) < MIN_TIMEJUMP)
335	return; /* all is well */	621	return; /* all is well */
336		622
337	ev_now = ev_time ();	623	ev_now = ev_time ();
338	}	624	}
339		625
340	/* time jump detected, reschedule atimers */	626	periodics_reschedule (diff - odiff);
341	for (i = 0; i < atimercnt; ++i)	627	/* 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	}	628	}
347	else	629	else
348	{	630	{
349	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	631	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
350	/* time jump detected, adjust rtimers */	632	{
		633	periodics_reschedule (ev_now - now);
		634
		635	/* adjust timers. this is easy, as the offset is the same for all */
351	for (i = 0; i < rtimercnt; ++i)	636	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	637	timers [i]->at += diff;
		638	}
353		639
354	now = ev_now;	640	now = ev_now;
355	}	641	}
356	}	642	}
357		643
358	int ev_loop_done;	644	int ev_loop_done;
359		645
360	void ev_loop (int flags)	646	void ev_loop (int flags)
361	{	647	{
362	double block;	648	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	649	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
364		650
365	do	651	do
366	{	652	{
		653	/* queue check watchers (and execute them) */
		654	if (preparecnt)
		655	{
		656	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		657	call_pending ();
		658	}
		659
367	/* update fd-related kernel structures */	660	/* update fd-related kernel structures */
368	fd_reify ();	661	fd_reify ();
369		662
370	/* calculate blocking time */	663	/* calculate blocking time */
		664
		665	/* we only need this for !monotonic clockor timers, but as we basically
		666	always have timers, we just calculate it always */
		667	ev_now = ev_time ();
		668
371	if (flags & EVLOOP_NONBLOCK)	669	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
372	block = 0.;	670	block = 0.;
373	else	671	else
374	{	672	{
375	block = MAX_BLOCKTIME;	673	block = MAX_BLOCKTIME;
376		674
377	if (rtimercnt)	675	if (timercnt)
378	{	676	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	677	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
380	if (block > to) block = to;	678	if (block > to) block = to;
381	}	679	}
382		680
383	if (atimercnt)	681	if (periodiccnt)
384	{	682	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	683	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
386	if (block > to) block = to;	684	if (block > to) block = to;
387	}	685	}
388		686
389	if (block < 0.) block = 0.;	687	if (block < 0.) block = 0.;
390	}	688	}
…		…
392	method_poll (block);	690	method_poll (block);
393		691
394	/* update ev_now, do magic */	692	/* update ev_now, do magic */
395	time_update ();	693	time_update ();
396		694
397	/* put pending timers into pendign queue and reschedule them */	695	/* queue pending timers and reschedule them */
398	/* absolute timers first */	696	timers_reify (); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	697	periodics_reify (); /* absolute timers called first */
400	/* relative timers second */	698
401	timers_reify (rtimers, rtimercnt, now);	699	/* queue idle watchers unless io or timers are pending */
		700	if (!pendingcnt)
		701	queue_events ((W *)idles, idlecnt, EV_IDLE);
		702
		703	/* queue check watchers, to be executed first */
		704	if (checkcnt)
		705	queue_events ((W *)checks, checkcnt, EV_CHECK);
402		706
403	call_pending ();	707	call_pending ();
404	}	708	}
405	while (!ev_loop_done);	709	while (!ev_loop_done);
406	}
407		710
		711	if (ev_loop_done != 2)
		712	ev_loop_done = 0;
		713	}
		714
		715	/*****************************************************************************/
		716
408	static void	717	static void
409	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	718	wlist_add (WL *head, WL elem)
410	{	719	{
411	elem->next = *head;	720	elem->next = *head;
412	*head = elem;	721	*head = elem;
413	}	722	}
414		723
415	static void	724	static void
416	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	725	wlist_del (WL *head, WL elem)
417	{	726	{
418	while (*head)	727	while (*head)
419	{	728	{
420	if (*head == elem)	729	if (*head == elem)
421	{	730	{
…		…
426	head = &(*head)->next;	735	head = &(*head)->next;
427	}	736	}
428	}	737	}
429		738
430	static void	739	static void
431	ev_start (struct ev_watcher *w, int active)	740	ev_clear_pending (W w)
432	{	741	{
		742	if (w->pending)
		743	{
		744	pendings [w->pending - 1].w = 0;
433	w->pending = 0;	745	w->pending = 0;
		746	}
		747	}
		748
		749	static void
		750	ev_start (W w, int active)
		751	{
434	w->active = active;	752	w->active = active;
435	}	753	}
436		754
437	static void	755	static void
438	ev_stop (struct ev_watcher *w)	756	ev_stop (W w)
439	{	757	{
440	if (w->pending)
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	758	w->active = 0;
444	/* nop */
445	}	759	}
446		760
		761	/*****************************************************************************/
		762
447	void	763	void
448	evio_start (struct ev_io *w)	764	ev_io_start (struct ev_io *w)
449	{	765	{
450	if (ev_is_active (w))	766	if (ev_is_active (w))
451	return;	767	return;
452		768
453	int fd = w->fd;	769	int fd = w->fd;
454		770
455	ev_start ((struct ev_watcher *)w, 1);	771	assert (("ev_io_start called with negative fd", fd >= 0));
		772
		773	ev_start ((W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	774	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	775	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		776
459	++fdchangecnt;	777	fd_change (fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	778	}
463		779
464	void	780	void
465	evio_stop (struct ev_io *w)	781	ev_io_stop (struct ev_io *w)
466	{	782	{
		783	ev_clear_pending ((W)w);
467	if (!ev_is_active (w))	784	if (!ev_is_active (w))
468	return;	785	return;
469		786
470	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	787	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	788	ev_stop ((W)w);
472		789
473	++fdchangecnt;	790	fd_change (w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	791	}
477		792
478	void	793	void
479	evtimer_start (struct ev_timer *w)	794	ev_timer_start (struct ev_timer *w)
480	{	795	{
		796	if (ev_is_active (w))
		797	return;
		798
		799	w->at += now;
		800
		801	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		802
		803	ev_start ((W)w, ++timercnt);
		804	array_needsize (timers, timermax, timercnt, );
		805	timers [timercnt - 1] = w;
		806	upheap ((WT *)timers, timercnt - 1);
		807	}
		808
		809	void
		810	ev_timer_stop (struct ev_timer *w)
		811	{
		812	ev_clear_pending ((W)w);
481	if (ev_is_active (w))	813	if (!ev_is_active (w))
482	return;	814	return;
483		815
484	if (w->is_abs)	816	if (w->active < timercnt--)
		817	{
		818	timers [w->active - 1] = timers [timercnt];
		819	downheap ((WT *)timers, timercnt, w->active - 1);
485	{	820	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	821
		822	w->at = w->repeat;
		823
		824	ev_stop ((W)w);
		825	}
		826
		827	void
		828	ev_timer_again (struct ev_timer *w)
		829	{
		830	if (ev_is_active (w))
		831	{
487	if (w->repeat)	832	if (w->repeat)
		833	{
		834	w->at = now + w->repeat;
		835	downheap ((WT *)timers, timercnt, w->active - 1);
		836	}
		837	else
		838	ev_timer_stop (w);
		839	}
		840	else if (w->repeat)
		841	ev_timer_start (w);
		842	}
		843
		844	void
		845	ev_periodic_start (struct ev_periodic *w)
		846	{
		847	if (ev_is_active (w))
		848	return;
		849
		850	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		851
		852	/* this formula differs from the one in periodic_reify because we do not always round up */
		853	if (w->interval)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	854	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
489		855
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	856	ev_start ((W)w, ++periodiccnt);
491	array_needsize (atimers, atimermax, atimercnt, );	857	array_needsize (periodics, periodicmax, periodiccnt, );
492	atimers [atimercnt - 1] = w;	858	periodics [periodiccnt - 1] = w;
493	upheap (atimers, atimercnt - 1);	859	upheap ((WT *)periodics, periodiccnt - 1);
		860	}
		861
		862	void
		863	ev_periodic_stop (struct ev_periodic *w)
		864	{
		865	ev_clear_pending ((W)w);
		866	if (!ev_is_active (w))
		867	return;
		868
		869	if (w->active < periodiccnt--)
494	}	870	{
		871	periodics [w->active - 1] = periodics [periodiccnt];
		872	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		873	}
		874
		875	ev_stop ((W)w);
		876	}
		877
		878	void
		879	ev_signal_start (struct ev_signal *w)
		880	{
		881	if (ev_is_active (w))
		882	return;
		883
		884	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		885
		886	ev_start ((W)w, 1);
		887	array_needsize (signals, signalmax, w->signum, signals_init);
		888	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		889
		890	if (!w->next)
		891	{
		892	struct sigaction sa;
		893	sa.sa_handler = sighandler;
		894	sigfillset (&sa.sa_mask);
		895	sa.sa_flags = 0;
		896	sigaction (w->signum, &sa, 0);
		897	}
		898	}
		899
		900	void
		901	ev_signal_stop (struct ev_signal *w)
		902	{
		903	ev_clear_pending ((W)w);
		904	if (!ev_is_active (w))
		905	return;
		906
		907	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		908	ev_stop ((W)w);
		909
		910	if (!signals [w->signum - 1].head)
		911	signal (w->signum, SIG_DFL);
		912	}
		913
		914	void
		915	ev_idle_start (struct ev_idle *w)
		916	{
		917	if (ev_is_active (w))
		918	return;
		919
		920	ev_start ((W)w, ++idlecnt);
		921	array_needsize (idles, idlemax, idlecnt, );
		922	idles [idlecnt - 1] = w;
		923	}
		924
		925	void
		926	ev_idle_stop (struct ev_idle *w)
		927	{
		928	ev_clear_pending ((W)w);
		929	if (ev_is_active (w))
		930	return;
		931
		932	idles [w->active - 1] = idles [--idlecnt];
		933	ev_stop ((W)w);
		934	}
		935
		936	void
		937	ev_prepare_start (struct ev_prepare *w)
		938	{
		939	if (ev_is_active (w))
		940	return;
		941
		942	ev_start ((W)w, ++preparecnt);
		943	array_needsize (prepares, preparemax, preparecnt, );
		944	prepares [preparecnt - 1] = w;
		945	}
		946
		947	void
		948	ev_prepare_stop (struct ev_prepare *w)
		949	{
		950	ev_clear_pending ((W)w);
		951	if (ev_is_active (w))
		952	return;
		953
		954	prepares [w->active - 1] = prepares [--preparecnt];
		955	ev_stop ((W)w);
		956	}
		957
		958	void
		959	ev_check_start (struct ev_check *w)
		960	{
		961	if (ev_is_active (w))
		962	return;
		963
		964	ev_start ((W)w, ++checkcnt);
		965	array_needsize (checks, checkmax, checkcnt, );
		966	checks [checkcnt - 1] = w;
		967	}
		968
		969	void
		970	ev_check_stop (struct ev_check *w)
		971	{
		972	ev_clear_pending ((W)w);
		973	if (ev_is_active (w))
		974	return;
		975
		976	checks [w->active - 1] = checks [--checkcnt];
		977	ev_stop ((W)w);
		978	}
		979
		980	void
		981	ev_child_start (struct ev_child *w)
		982	{
		983	if (ev_is_active (w))
		984	return;
		985
		986	ev_start ((W)w, 1);
		987	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		988	}
		989
		990	void
		991	ev_child_stop (struct ev_child *w)
		992	{
		993	ev_clear_pending ((W)w);
		994	if (ev_is_active (w))
		995	return;
		996
		997	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		998	ev_stop ((W)w);
		999	}
		1000
		1001	/*****************************************************************************/
		1002
		1003	struct ev_once
		1004	{
		1005	struct ev_io io;
		1006	struct ev_timer to;
		1007	void (cb)(int revents, void arg);
		1008	void *arg;
		1009	};
		1010
		1011	static void
		1012	once_cb (struct ev_once *once, int revents)
		1013	{
		1014	void (cb)(int revents, void arg) = once->cb;
		1015	void *arg = once->arg;
		1016
		1017	ev_io_stop (&once->io);
		1018	ev_timer_stop (&once->to);
		1019	free (once);
		1020
		1021	cb (revents, arg);
		1022	}
		1023
		1024	static void
		1025	once_cb_io (struct ev_io *w, int revents)
		1026	{
		1027	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1028	}
		1029
		1030	static void
		1031	once_cb_to (struct ev_timer *w, int revents)
		1032	{
		1033	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1034	}
		1035
		1036	void
		1037	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1038	{
		1039	struct ev_once *once = malloc (sizeof (struct ev_once));
		1040
		1041	if (!once)
		1042	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
495	else	1043	else
496	{	1044	{
497	w->at += now;	1045	once->cb = cb;
		1046	once->arg = arg;
498		1047
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1048	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1049	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	}	1050	{
520	}	1051	ev_io_set (&once->io, fd, events);
521	else	1052	ev_io_start (&once->io);
522	{
523	if (w->active < rtimercnt--)
524	{	1053	}
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1054
526	downheap (rtimers, rtimercnt, w->active - 1);	1055	ev_watcher_init (&once->to, once_cb_to);
		1056	if (timeout >= 0.)
527	}	1057	{
		1058	ev_timer_set (&once->to, timeout, 0.);
		1059	ev_timer_start (&once->to);
		1060	}
528	}	1061	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1062	}
532		1063
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	/*****************************************************************************/	1064	/*****************************************************************************/
		1065
555	#if 1	1066	#if 0
		1067
		1068	struct ev_io wio;
556		1069
557	static void	1070	static void
558	sin_cb (struct ev_io *w, int revents)	1071	sin_cb (struct ev_io *w, int revents)
559	{	1072	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1073	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
562		1075
563	static void	1076	static void
564	ocb (struct ev_timer *w, int revents)	1077	ocb (struct ev_timer *w, int revents)
565	{	1078	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1079	//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);	1080	ev_timer_stop (w);
568	evtimer_start (w);	1081	ev_timer_start (w);
		1082	}
		1083
		1084	static void
		1085	scb (struct ev_signal *w, int revents)
		1086	{
		1087	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1088	ev_io_stop (&wio);
		1089	ev_io_start (&wio);
		1090	}
		1091
		1092	static void
		1093	gcb (struct ev_signal *w, int revents)
		1094	{
		1095	fprintf (stderr, "generic %x\n", revents);
		1096
569	}	1097	}
570		1098
571	int main (void)	1099	int main (void)
572	{	1100	{
573	struct ev_io sin;
574
575	ev_init (0);	1101	ev_init (0);
576		1102
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);	1103	ev_io_init (&wio, sin_cb, 0, EV_READ);
579	evio_start (&sin);	1104	ev_io_start (&wio);
580		1105
581	struct ev_timer t[10000];	1106	struct ev_timer t[10000];
582		1107
583	#if 1	1108	#if 0
584	int i;	1109	int i;
585	for (i = 0; i < 10000; ++i)	1110	for (i = 0; i < 10000; ++i)
586	{	1111	{
587	struct ev_timer *w = t + i;	1112	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);	1113	ev_watcher_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);	1114	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
590	evtimer_start (w);	1115	ev_timer_start (w);
591	if (drand48 () < 0.5)	1116	if (drand48 () < 0.5)
592	evtimer_stop (w);	1117	ev_timer_stop (w);
593	}	1118	}
594	#endif	1119	#endif
595		1120
596	struct ev_timer t1;	1121	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);	1122	ev_timer_init (&t1, ocb, 5, 10);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);	1123	ev_timer_start (&t1);
		1124
		1125	struct ev_signal sig;
		1126	ev_signal_init (&sig, scb, SIGQUIT);
		1127	ev_signal_start (&sig);
		1128
		1129	struct ev_check cw;
		1130	ev_check_init (&cw, gcb);
		1131	ev_check_start (&cw);
		1132
		1133	struct ev_idle iw;
		1134	ev_idle_init (&iw, gcb);
		1135	ev_idle_start (&iw);
600		1136
601	ev_loop (0);	1137	ev_loop (0);
602		1138
603	return 0;	1139	return 0;
604	}	1140	}

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Comparing libev/ev.c (file contents): Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs. Revision 1.34 by root, Thu Nov 1 11:43:11 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.34 by root, Thu Nov 1 11:43:11 2007 UTC