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

Comparing libev/ev.c (file contents):
Revision 1.3 by root, Tue Oct 30 21:45:00 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
		42	#include <assert.h>
6	#include <errno.h>	43	#include <errno.h>
		44	#include <sys/types.h>
		45	#include <sys/wait.h>
7	#include <sys/time.h>	46	#include <sys/time.h>
8	#include <time.h>	47	#include <time.h>
9		48
		49	#ifndef EV_USE_MONOTONIC
10	#ifdef CLOCK_MONOTONIC	50	# ifdef CLOCK_MONOTONIC
11	# define HAVE_MONOTONIC 1	51	# define EV_USE_MONOTONIC 1
12	#endif	52	# endif
		53	#endif
13		54
		55	#ifndef EV_USE_SELECT
		56	# define EV_USE_SELECT 1
		57	#endif
		58
		59	#ifndef EV_USE_EPOLL
14	#define HAVE_EPOLL 1	60	# define EV_USE_EPOLL 0
		61	#endif
		62
		63	#ifndef CLOCK_REALTIME
15	#define HAVE_REALTIME 1	64	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	65	#endif
		66	#ifndef EV_USE_REALTIME
		67	# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */
		68	#endif
17		69
18	#define MAX_BLOCKTIME 60.	70	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		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 */
19		74
20	#include "ev.h"	75	#include "ev.h"
21		76
22	struct ev_watcher {	77	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	78	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	79	typedef struct ev_watcher_time *WT;
28	};
29		80
		81	static ev_tstamp now, diff; /* monotonic clock */
30	ev_tstamp ev_now;	82	ev_tstamp ev_now;
31	int ev_method;	83	int ev_method;
32		84
33	static int have_monotonic; /* runtime */	85	static int have_monotonic; /* runtime */
34		86
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	87	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
36	static void (*method_reify)(void);	88	static void (*method_modify)(int fd, int oev, int nev);
37	static void (*method_poll)(ev_tstamp timeout);	89	static void (*method_poll)(ev_tstamp timeout);
		90
		91	/*****************************************************************************/
38		92
39	ev_tstamp	93	ev_tstamp
40	ev_time (void)	94	ev_time (void)
41	{	95	{
42	#if HAVE_REALTIME	96	#if EV_USE_REALTIME
43	struct timespec ts;	97	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	98	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	99	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	100	#else
47	struct timeval tv;	101	struct timeval tv;
51	}	105	}
52		106
53	static ev_tstamp	107	static ev_tstamp
54	get_clock (void)	108	get_clock (void)
55	{	109	{
56	#if HAVE_MONOTONIC	110	#if EV_USE_MONOTONIC
57	if (have_monotonic)	111	if (have_monotonic)
58	{	112	{
59	struct timespec ts;	113	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	114	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	115	return ts.tv_sec + ts.tv_nsec * 1e-9;
…		…
63	#endif	117	#endif
64		118
65	return ev_time ();	119	return ev_time ();
66	}	120	}
67		121
		122	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		123
68	#define array_needsize(base,cur,cnt,init) \	124	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	125	if ((cnt) > cur) \
70	{ \	126	{ \
71	int newcnt = cur ? cur << 1 : 16; \	127	int newcnt = cur; \
72	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	\
73	base = realloc (base, sizeof (base) (newcnt)); \	134	base = realloc (base, sizeof (base) (newcnt)); \
74	init (base + cur, newcnt - cur); \	135	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	136	cur = newcnt; \
76	}	137	}
77		138
		139	/*****************************************************************************/
		140
78	typedef struct	141	typedef struct
79	{	142	{
80	struct ev_io *head;	143	struct ev_io *head;
81	unsigned char wev, rev; /* want, received event set */	144	int events;
82	} ANFD;	145	} ANFD;
83		146
84	static ANFD *anfds;	147	static ANFD *anfds;
85	static int anfdmax;	148	static int anfdmax;
86		149
87	static int *fdchanges;
88	static int fdchangemax, fdchangecnt;
89
90	static void	150	static void
91	anfds_init (ANFD *base, int count)	151	anfds_init (ANFD *base, int count)
92	{	152	{
93	while (count--)	153	while (count--)
94	{	154	{
95	base->head = 0;	155	base->head = 0;
96	base->wev = base->rev = EV_NONE;	156	base->events = EV_NONE;
97	++base;	157	++base;
98	}	158	}
99	}	159	}
100		160
101	typedef struct	161	typedef struct
102	{	162	{
103	struct ev_watcher *w;	163	W w;
104	int events;	164	int events;
105	} ANPENDING;	165	} ANPENDING;
106		166
107	static ANPENDING *pendings;	167	static ANPENDING *pendings;
108	static int pendingmax, pendingcnt;	168	static int pendingmax, pendingcnt;
109		169
110	static void	170	static void
111	event (struct ev_watcher *w, int events)	171	event (W w, int events)
112	{	172	{
		173	if (w->pending)
		174	{
		175	pendings [w->pending - 1].events \|= events;
		176	return;
		177	}
		178
113	w->pending = ++pendingcnt;	179	w->pending = ++pendingcnt;
114	array_needsize (pendings, pendingmax, pendingcnt, );	180	array_needsize (pendings, pendingmax, pendingcnt, );
115	pendings [pendingcnt - 1].w = w;	181	pendings [pendingcnt - 1].w = w;
116	pendings [pendingcnt - 1].events = events;	182	pendings [pendingcnt - 1].events = events;
117	}	183	}
118		184
119	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
120	fd_event (int fd, int events)	195	fd_event (int fd, int events)
121	{	196	{
122	ANFD *anfd = anfds + fd;	197	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	198	struct ev_io *w;
124		199
125	for (w = anfd->head; w; w = w->next)	200	for (w = anfd->head; w; w = w->next)
126	{	201	{
127	int ev = w->events & events;	202	int ev = w->events & events;
128		203
129	if (ev)	204	if (ev)
130	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)
131	}	220	{
		221	int fd = fdchanges [i];
		222	ANFD *anfd = anfds + fd;
		223	struct ev_io *w;
		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;
132	}	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	/*****************************************************************************/
133		272
134	static struct ev_timer **timers;	273	static struct ev_timer **timers;
135	static int timermax, timercnt;	274	static int timermax, timercnt;
136		275
		276	static struct ev_periodic **periodics;
		277	static int periodicmax, periodiccnt;
		278
137	static void	279	static void
138	upheap (int k)	280	upheap (WT *timers, int k)
139	{	281	{
140	struct ev_timer *w = timers [k];	282	WT w = timers [k];
141		283
142	while (k && timers [k >> 1]->at > w->at)	284	while (k && timers [k >> 1]->at > w->at)
143	{	285	{
144	timers [k] = timers [k >> 1];	286	timers [k] = timers [k >> 1];
145	timers [k]->active = k + 1;	287	timers [k]->active = k + 1;
…		…
150	timers [k]->active = k + 1;	292	timers [k]->active = k + 1;
151		293
152	}	294	}
153		295
154	static void	296	static void
155	downheap (int k)	297	downheap (WT *timers, int N, int k)
156	{	298	{
157	struct ev_timer *w = timers [k];	299	WT w = timers [k];
158		300
159	while (k < (timercnt >> 1))	301	while (k < (N >> 1))
160	{	302	{
161	int j = k << 1;	303	int j = k << 1;
162		304
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	305	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
164	++j;	306	++j;
165		307
166	if (w->at <= timers [j]->at)	308	if (w->at <= timers [j]->at)
167	break;	309	break;
168		310
…		…
173		315
174	timers [k] = w;	316	timers [k] = w;
175	timers [k]->active = k + 1;	317	timers [k]->active = k + 1;
176	}	318	}
177		319
178	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;
179	static int signalmax, signalcnt;	329	static int signalmax;
180		330
		331	static int sigpipe [2];
		332	static sig_atomic_t gotsig;
		333	static struct ev_io sigev;
		334
181	static void	335	static void
182	signals_init (struct ev_signal **base, int count)	336	signals_init (ANSIG *base, int count)
183	{	337	{
184	while (count--)	338	while (count--)
185	*base++ = 0;	339	{
		340	base->head = 0;
		341	base->gotsig = 0;
		342	++base;
		343	}
186	}	344	}
187		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
188	#if HAVE_EPOLL	428	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	429	# include "ev_epoll.c"
190	#endif	430	#endif
191	#if HAVE_SELECT	431	#if EV_USE_SELECT
192	# include "ev_select.c"	432	# include "ev_select.c"
193	#endif	433	#endif
194		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
195	int ev_init (int flags)	447	int ev_init (int flags)
196	{	448	{
		449	if (!ev_method)
		450	{
197	#if HAVE_MONOTONIC	451	#if EV_USE_MONOTONIC
198	{	452	{
199	struct timespec ts;	453	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	454	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	455	have_monotonic = 1;
202	}	456	}
203	#endif	457	#endif
204		458
205	ev_now = ev_time ();	459	ev_now = ev_time ();
		460	now = get_clock ();
		461	diff = ev_now - now;
206		462
207	#if HAVE_EPOLL	463	if (pipe (sigpipe))
208	if (epoll_init (flags))	464	return 0;
209	return ev_method;
210	#endif
211	#if HAVE_SELECT
212	if (select_init (flags))
213	return ev_method;
214	#endif
215		465
216	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
217	return ev_method;	484	return ev_method;
218	}	485	}
219		486
		487	/*****************************************************************************/
		488
		489	void
220	void ev_prefork (void)	490	ev_prefork (void)
221	{	491	{
		492	/* nop */
222	}	493	}
223		494
		495	void
224	void ev_postfork_parent (void)	496	ev_postfork_parent (void)
225	{	497	{
		498	/* nop */
226	}	499	}
227		500
		501	void
228	void ev_postfork_child (void)	502	ev_postfork_child (void)
229	{	503	{
230	#if HAVE_EPOLL	504	#if EV_USE_EPOLL
		505	if (ev_method == EVMETHOD_EPOLL)
231	epoll_postfork_child ();	506	epoll_postfork_child ();
232	#endif	507	#endif
233	}
234		508
		509	ev_io_stop (&sigev);
		510	close (sigpipe [0]);
		511	close (sigpipe [1]);
		512	pipe (sigpipe);
		513	siginit ();
		514	}
		515
		516	/*****************************************************************************/
		517
235	static void	518	static void
236	call_pending ()	519	call_pending (void)
237	{	520	{
238	int i;	521	while (pendingcnt)
239
240	for (i = 0; i < pendingcnt; ++i)
241	{	522	{
242	ANPENDING *p = pendings + i;	523	ANPENDING *p = pendings + --pendingcnt;
243		524
244	if (p->w)	525	if (p->w)
245	{	526	{
246	p->w->pending = 0;	527	p->w->pending = 0;
247	p->w->cb (p->w, p->events);	528	p->w->cb (p->w, p->events);
248	}	529	}
249	}	530	}
250
251	pendingcnt = 0;
252	}	531	}
253		532
254	static void	533	static void
255	timer_reify (void)	534	timers_reify (void)
256	{	535	{
257	while (timercnt && timers [0]->at <= ev_now)	536	while (timercnt && timers [0]->at <= now)
258	{	537	{
259	struct ev_timer *w = timers [0];	538	struct ev_timer *w = timers [0];
260		539
261	/* first reschedule timer */	540	/* first reschedule or stop timer */
262	if (w->repeat)	541	if (w->repeat)
263	{	542	{
264	if (w->is_abs)
265	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
266	else
267	w->at = ev_now + w->repeat;	543	w->at = now + w->repeat;
268		544	assert (("timer timeout in the past, negative repeat?", w->at > now));
269	downheap (0);	545	downheap ((WT *)timers, timercnt, 0);
270	}	546	}
271	else	547	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	548	ev_timer_stop (w); /* nonrepeating: stop timer */
273		549
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	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)
		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 */
		570
		571	event ((W)w, EV_TIMEOUT);
		572	}
		573	}
		574
		575	static void
		576	periodics_reschedule (ev_tstamp diff)
		577	{
		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
		605	ev_now = ev_time ();
		606
		607	if (have_monotonic)
		608	{
		609	ev_tstamp odiff = diff;
		610
		611	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		612	{
		613	now = get_clock ();
		614	diff = ev_now - now;
		615
		616	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		617	return; /* all is well */
		618
		619	ev_now = ev_time ();
		620	}
		621
		622	periodics_reschedule (diff - odiff);
		623	/* no timer adjustment, as the monotonic clock doesn't jump */
		624	}
		625	else
		626	{
		627	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
		628	{
		629	periodics_reschedule (ev_now - now);
		630
		631	/* adjust timers. this is easy, as the offset is the same for all */
		632	for (i = 0; i < timercnt; ++i)
		633	timers [i]->at += diff;
		634	}
		635
		636	now = ev_now;
275	}	637	}
276	}	638	}
277		639
278	int ev_loop_done;	640	int ev_loop_done;
279		641
280	int ev_loop (int flags)	642	void ev_loop (int flags)
281	{	643	{
282	double block;	644	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	645	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
284		646
285	do	647	do
286	{	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
287	/* update fd-related kernel structures */	656	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	657	fd_reify ();
289		658
290	/* 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 */
291	ev_now = ev_time ();	663	ev_now = ev_time ();
292		664
293	if (flags & EVLOOP_NONBLOCK)	665	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
294	block = 0.;	666	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	667	else
298	{	668	{
		669	block = MAX_BLOCKTIME;
		670
		671	if (timercnt)
		672	{
		673	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
		674	if (block > to) block = to;
		675	}
		676
		677	if (periodiccnt)
		678	{
299	block = timers [0]->at - ev_now + method_fudge;	679	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
		680	if (block > to) block = to;
		681	}
		682
300	if (block < 0.) block = 0.;	683	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	684	}
303		685
304	method_poll (block);	686	method_poll (block);
305		687
		688	/* update ev_now, do magic */
		689	time_update ();
		690
306	/* put pending timers into pendign queue and reschedule them */	691	/* queue pending timers and reschedule them */
307	timer_reify ();	692	timers_reify (); /* relative timers called last */
		693	periodics_reify (); /* absolute timers called first */
308		694
309	ev_now = ev_time ();	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);
		702
310	call_pending ();	703	call_pending ();
311	}	704	}
312	while (!ev_loop_done);	705	while (!ev_loop_done);
313	}
314		706
		707	if (ev_loop_done != 2)
		708	ev_loop_done = 0;
		709	}
		710
		711	/*****************************************************************************/
		712
315	static void	713	static void
316	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	714	wlist_add (WL *head, WL elem)
317	{	715	{
318	elem->next = *head;	716	elem->next = *head;
319	*head = elem;	717	*head = elem;
320	}	718	}
321		719
322	static void	720	static void
323	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	721	wlist_del (WL *head, WL elem)
324	{	722	{
325	while (*head)	723	while (*head)
326	{	724	{
327	if (*head == elem)	725	if (*head == elem)
328	{	726	{
…		…
333	head = &(*head)->next;	731	head = &(*head)->next;
334	}	732	}
335	}	733	}
336		734
337	static void	735	static void
338	ev_start (struct ev_watcher *w, int active)	736	ev_clear (W w)
339	{	737	{
		738	if (w->pending)
		739	{
		740	pendings [w->pending - 1].w = 0;
340	w->pending = 0;	741	w->pending = 0;
		742	}
		743	}
		744
		745	static void
		746	ev_start (W w, int active)
		747	{
341	w->active = active;	748	w->active = active;
342	}	749	}
343		750
344	static void	751	static void
345	ev_stop (struct ev_watcher *w)	752	ev_stop (W w)
346	{	753	{
347	if (w->pending)
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	754	w->active = 0;
351	/* nop */
352	}	755	}
353		756
		757	/*****************************************************************************/
		758
354	void	759	void
355	evio_start (struct ev_io *w)	760	ev_io_start (struct ev_io *w)
356	{	761	{
357	if (ev_is_active (w))	762	if (ev_is_active (w))
358	return;	763	return;
359		764
360	int fd = w->fd;	765	int fd = w->fd;
361		766
362	ev_start ((struct ev_watcher *)w, 1);	767	ev_start ((W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	768	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	769	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		770
366	++fdchangecnt;	771	fd_change (fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	772	}
370		773
371	void	774	void
372	evio_stop (struct ev_io *w)	775	ev_io_stop (struct ev_io *w)
373	{	776	{
		777	ev_clear ((W)w);
374	if (!ev_is_active (w))	778	if (!ev_is_active (w))
375	return;	779	return;
376		780
377	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);
378	ev_stop ((struct ev_watcher *)w);	782	ev_stop ((W)w);
379		783
380	++fdchangecnt;	784	fd_change (w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	785	}
384		786
385	void	787	void
386	evtimer_start (struct ev_timer *w)	788	ev_timer_start (struct ev_timer *w)
387	{	789	{
388	if (ev_is_active (w))	790	if (ev_is_active (w))
389	return;	791	return;
390		792
391	if (w->is_abs)
392	{
393	/* this formula differs from the one in timer_reify becuse we do not round up */
394	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
396	}
397	else
398	w->at += ev_now;	793	w->at += now;
399		794
400	ev_start ((struct ev_watcher *)w, ++timercnt);	795	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
		796
		797	ev_start ((W)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );	798	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;	799	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);	800	upheap ((WT *)timers, timercnt - 1);
404	}	801	}
405		802
406	void	803	void
407	evtimer_stop (struct ev_timer *w)	804	ev_timer_stop (struct ev_timer *w)
408	{	805	{
		806	ev_clear ((W)w);
409	if (!ev_is_active (w))	807	if (!ev_is_active (w))
410	return;	808	return;
411		809
412	if (w->active < timercnt--)	810	if (w->active < timercnt--)
413	{	811	{
414	timers [w->active - 1] = timers [timercnt];	812	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);	813	downheap ((WT *)timers, timercnt, w->active - 1);
		814	}
		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))
416	}	825	{
417		826	if (w->repeat)
418	ev_stop ((struct ev_watcher *)w);	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);
419	}	836	}
420		837
421	void	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)
		848	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		849
		850	ev_start ((W)w, ++periodiccnt);
		851	array_needsize (periodics, periodicmax, periodiccnt, );
		852	periodics [periodiccnt - 1] = w;
		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--)
		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
422	evsignal_start (struct ev_signal *w)	873	ev_signal_start (struct ev_signal *w)
423	{	874	{
424	if (ev_is_active (w))	875	if (ev_is_active (w))
425	return;	876	return;
426		877
427	ev_start ((struct ev_watcher *)w, 1);	878	ev_start ((W)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);	879	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	880	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
430	}
431		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
432	void	892	void
433	evsignal_stop (struct ev_signal *w)	893	ev_signal_stop (struct ev_signal *w)
434	{	894	{
		895	ev_clear ((W)w);
435	if (!ev_is_active (w))	896	if (!ev_is_active (w))
436	return;	897	return;
437		898
438	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	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
439	ev_stop ((struct ev_watcher *)w);	962	ev_check_stop (struct ev_check *w)
440	}	963	{
		964	ev_clear ((W)w);
		965	if (ev_is_active (w))
		966	return;
441		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
442	/*****************************************************************************/	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
443	#if 1	1058	#if 0
		1059
		1060	struct ev_io wio;
444		1061
445	static void	1062	static void
446	sin_cb (struct ev_io *w, int revents)	1063	sin_cb (struct ev_io *w, int revents)
447	{	1064	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1065	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}	1066	}
450		1067
451	static void	1068	static void
452	ocb (struct ev_timer *w, int revents)	1069	ocb (struct ev_timer *w, int revents)
453	{	1070	{
454	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);
		1072	ev_timer_stop (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
455	}	1089	}
456		1090
457	int main (void)	1091	int main (void)
458	{	1092	{
459	struct ev_io sin;
460
461	ev_init (0);	1093	ev_init (0);
462		1094
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);	1095	ev_io_init (&wio, sin_cb, 0, EV_READ);
465	evio_start (&sin);	1096	ev_io_start (&wio);
466		1097
467	struct ev_timer t[1000];	1098	struct ev_timer t[10000];
468		1099
		1100	#if 0
469	int i;	1101	int i;
470	for (i = 0; i < 1000; ++i)	1102	for (i = 0; i < 10000; ++i)
471	{	1103	{
472	struct ev_timer *w = t + i;	1104	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);	1105	ev_watcher_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);	1106	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
475	evtimer_start (w);	1107	ev_timer_start (w);
476	if (drand48 () < 0.5)	1108	if (drand48 () < 0.5)
477	evtimer_stop (w);	1109	ev_timer_stop (w);
478	}	1110	}
		1111	#endif
		1112
		1113	struct ev_timer t1;
		1114	ev_timer_init (&t1, ocb, 5, 10);
		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);
479		1128
480	ev_loop (0);	1129	ev_loop (0);
481		1130
482	return 0;	1131	return 0;
483	}	1132	}

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Comparing libev/ev.c (file contents): Revision 1.3 by root, Tue Oct 30 21:45:00 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 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs.
Revision 1.32 by root, Thu Nov 1 09:21:51 2007 UTC