[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 1.27 by root, Wed Oct 31 22:16:36 2007 UTC

…		…
		1	/*
		2	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions are
		7	* met:
		8	*
		9	* * Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	*
		12	* * Redistributions in binary form must reproduce the above
		13	* copyright notice, this list of conditions and the following
		14	* disclaimer in the documentation and/or other materials provided
		15	* with the distribution.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		18	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		19	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		20	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		21	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		22	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		23	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		27	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		28	*/
		29
1	#include <math.h>	30	#include <math.h>
2	#include <stdlib.h>	31	#include <stdlib.h>
		32	#include <unistd.h>
		33	#include <fcntl.h>
		34	#include <signal.h>
		35	#include <stddef.h>
3		36
4	#include <stdio.h>	37	#include <stdio.h>
5		38
		39	#include <assert.h>
6	#include <errno.h>	40	#include <errno.h>
		41	#include <sys/types.h>
		42	#include <sys/wait.h>
7	#include <sys/time.h>	43	#include <sys/time.h>
8	#include <time.h>	44	#include <time.h>
9		45
		46	#ifndef HAVE_MONOTONIC
10	#ifdef CLOCK_MONOTONIC	47	# ifdef CLOCK_MONOTONIC
11	# define HAVE_MONOTONIC 1	48	# define HAVE_MONOTONIC 1
12	#endif	49	# endif
		50	#endif
13		51
14	#define HAVE_EPOLL 1	52	#ifndef HAVE_SELECT
15	#define HAVE_REALTIME 1
16	#define HAVE_SELECT 0	53	# define HAVE_SELECT 1
		54	#endif
17		55
		56	#ifndef HAVE_EPOLL
		57	# define HAVE_EPOLL 0
		58	#endif
		59
		60	#ifndef HAVE_REALTIME
		61	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */
		62	#endif
		63
		64	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
18	#define MAX_BLOCKTIME 60.	65	#define MAX_BLOCKTIME 60.
		66	#define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */
19		67
20	#include "ev.h"	68	#include "ev.h"
21		69
22	struct ev_watcher {	70	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	71	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	72	typedef struct ev_watcher_time *WT;
28	};
29		73
		74	static ev_tstamp now, diff; /* monotonic clock */
30	ev_tstamp ev_now;	75	ev_tstamp ev_now;
31	int ev_method;	76	int ev_method;
32		77
33	static int have_monotonic; /* runtime */	78	static int have_monotonic; /* runtime */
34		79
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	80	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
36	static void (*method_reify)(void);	81	static void (*method_modify)(int fd, int oev, int nev);
37	static void (*method_poll)(ev_tstamp timeout);	82	static void (*method_poll)(ev_tstamp timeout);
		83
		84	/*****************************************************************************/
38		85
39	ev_tstamp	86	ev_tstamp
40	ev_time (void)	87	ev_time (void)
41	{	88	{
42	#if HAVE_REALTIME	89	#if HAVE_REALTIME
66	}	113	}
67		114
68	#define array_needsize(base,cur,cnt,init) \	115	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	116	if ((cnt) > cur) \
70	{ \	117	{ \
71	int newcnt = cur ? cur << 1 : 16; \	118	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	119	do \
		120	{ \
		121	newcnt = (newcnt << 1) \| 4 & ~3; \
		122	} \
		123	while ((cnt) > newcnt); \
		124	\
73	base = realloc (base, sizeof (base) (newcnt)); \	125	base = realloc (base, sizeof (base) (newcnt)); \
74	init (base + cur, newcnt - cur); \	126	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	127	cur = newcnt; \
76	}	128	}
77		129
		130	/*****************************************************************************/
		131
78	typedef struct	132	typedef struct
79	{	133	{
80	struct ev_io *head;	134	struct ev_io *head;
81	unsigned char wev, rev; /* want, received event set */	135	int events;
82	} ANFD;	136	} ANFD;
83		137
84	static ANFD *anfds;	138	static ANFD *anfds;
85	static int anfdmax;	139	static int anfdmax;
86		140
		141	static void
		142	anfds_init (ANFD *base, int count)
		143	{
		144	while (count--)
		145	{
		146	base->head = 0;
		147	base->events = EV_NONE;
		148	++base;
		149	}
		150	}
		151
		152	typedef struct
		153	{
		154	W w;
		155	int events;
		156	} ANPENDING;
		157
		158	static ANPENDING *pendings;
		159	static int pendingmax, pendingcnt;
		160
		161	static void
		162	event (W w, int events)
		163	{
		164	if (w->active)
		165	{
		166	w->pending = ++pendingcnt;
		167	array_needsize (pendings, pendingmax, pendingcnt, );
		168	pendings [pendingcnt - 1].w = w;
		169	pendings [pendingcnt - 1].events = events;
		170	}
		171	}
		172
		173	static void
		174	queue_events (W *events, int eventcnt, int type)
		175	{
		176	int i;
		177
		178	for (i = 0; i < eventcnt; ++i)
		179	event (events [i], type);
		180	}
		181
		182	static void
		183	fd_event (int fd, int events)
		184	{
		185	ANFD *anfd = anfds + fd;
		186	struct ev_io *w;
		187
		188	for (w = anfd->head; w; w = w->next)
		189	{
		190	int ev = w->events & events;
		191
		192	if (ev)
		193	event ((W)w, ev);
		194	}
		195	}
		196
		197	/*****************************************************************************/
		198
87	static int *fdchanges;	199	static int *fdchanges;
88	static int fdchangemax, fdchangecnt;	200	static int fdchangemax, fdchangecnt;
89		201
90	static void	202	static void
91	anfds_init (ANFD *base, int count)	203	fd_reify (void)
92	{	204	{
93	while (count--)	205	int i;
94	{	206
95	base->head = 0;	207	for (i = 0; i < fdchangecnt; ++i)
96	base->wev = base->rev = EV_NONE;
97	++base;
98	}	208	{
99	}	209	int fd = fdchanges [i];
100
101	typedef struct
102	{
103	struct ev_watcher *w;
104	int events;
105	} ANPENDING;
106
107	static ANPENDING *pendings;
108	static int pendingmax, pendingcnt;
109
110	static void
111	event (struct ev_watcher *w, int events)
112	{
113	w->pending = ++pendingcnt;
114	array_needsize (pendings, pendingmax, pendingcnt, );
115	pendings [pendingcnt - 1].w = w;
116	pendings [pendingcnt - 1].events = events;
117	}
118
119	static void
120	fd_event (int fd, int events)
121	{
122	ANFD *anfd = anfds + fd;	210	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	211	struct ev_io *w;
124		212
		213	int events = 0;
		214
125	for (w = anfd->head; w; w = w->next)	215	for (w = anfd->head; w; w = w->next)
		216	events \|= w->events;
		217
		218	anfd->events &= ~EV_REIFY;
		219
		220	if (anfd->events != events)
		221	{
		222	method_modify (fd, anfd->events, events);
		223	anfd->events = events;
		224	}
126	{	225	}
127	int ev = w->events & events;
128		226
129	if (ev)	227	fdchangecnt = 0;
130	event ((struct ev_watcher *)w, ev);
131	}
132	}	228	}
		229
		230	static void
		231	fd_change (int fd)
		232	{
		233	if (anfds [fd].events & EV_REIFY)
		234	return;
		235
		236	anfds [fd].events \|= EV_REIFY;
		237
		238	++fdchangecnt;
		239	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		240	fdchanges [fdchangecnt - 1] = fd;
		241	}
		242
		243	/* called on EBADF to verify fds */
		244	static void
		245	fd_recheck (void)
		246	{
		247	int fd;
		248
		249	for (fd = 0; fd < anfdmax; ++fd)
		250	if (anfds [fd].events)
		251	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		252	while (anfds [fd].head)
		253	{
		254	event ((W)anfds [fd].head, EV_ERROR);
		255	evio_stop (anfds [fd].head);
		256	}
		257	}
		258
		259	/*****************************************************************************/
133		260
134	static struct ev_timer **timers;	261	static struct ev_timer **timers;
135	static int timermax, timercnt;	262	static int timermax, timercnt;
136		263
		264	static struct ev_periodic **periodics;
		265	static int periodicmax, periodiccnt;
		266
137	static void	267	static void
138	upheap (int k)	268	upheap (WT *timers, int k)
139	{	269	{
140	struct ev_timer *w = timers [k];	270	WT w = timers [k];
141		271
142	while (k && timers [k >> 1]->at > w->at)	272	while (k && timers [k >> 1]->at > w->at)
143	{	273	{
144	timers [k] = timers [k >> 1];	274	timers [k] = timers [k >> 1];
145	timers [k]->active = k + 1;	275	timers [k]->active = k + 1;
…		…
150	timers [k]->active = k + 1;	280	timers [k]->active = k + 1;
151		281
152	}	282	}
153		283
154	static void	284	static void
155	downheap (int k)	285	downheap (WT *timers, int N, int k)
156	{	286	{
157	struct ev_timer *w = timers [k];	287	WT w = timers [k];
158		288
159	while (k < (timercnt >> 1))	289	while (k < (N >> 1))
160	{	290	{
161	int j = k << 1;	291	int j = k << 1;
162		292
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	293	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
164	++j;	294	++j;
165		295
166	if (w->at <= timers [j]->at)	296	if (w->at <= timers [j]->at)
167	break;	297	break;
168		298
…		…
173		303
174	timers [k] = w;	304	timers [k] = w;
175	timers [k]->active = k + 1;	305	timers [k]->active = k + 1;
176	}	306	}
177		307
178	static struct ev_signal **signals;	308	/*****************************************************************************/
		309
		310	typedef struct
		311	{
		312	struct ev_signal *head;
		313	sig_atomic_t gotsig;
		314	} ANSIG;
		315
		316	static ANSIG *signals;
179	static int signalmax, signalcnt;	317	static int signalmax;
180		318
		319	static int sigpipe [2];
		320	static sig_atomic_t gotsig;
		321	static struct ev_io sigev;
		322
181	static void	323	static void
182	signals_init (struct ev_signal **base, int count)	324	signals_init (ANSIG *base, int count)
183	{	325	{
184	while (count--)	326	while (count--)
185	*base++ = 0;	327	{
		328	base->head = 0;
		329	base->gotsig = 0;
		330	++base;
		331	}
186	}	332	}
		333
		334	static void
		335	sighandler (int signum)
		336	{
		337	signals [signum - 1].gotsig = 1;
		338
		339	if (!gotsig)
		340	{
		341	gotsig = 1;
		342	write (sigpipe [1], &gotsig, 1);
		343	}
		344	}
		345
		346	static void
		347	sigcb (struct ev_io *iow, int revents)
		348	{
		349	struct ev_signal *w;
		350	int sig;
		351
		352	gotsig = 0;
		353	read (sigpipe [0], &revents, 1);
		354
		355	for (sig = signalmax; sig--; )
		356	if (signals [sig].gotsig)
		357	{
		358	signals [sig].gotsig = 0;
		359
		360	for (w = signals [sig].head; w; w = w->next)
		361	event ((W)w, EV_SIGNAL);
		362	}
		363	}
		364
		365	static void
		366	siginit (void)
		367	{
		368	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		369	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		370
		371	/* rather than sort out wether we really need nb, set it */
		372	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		373	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		374
		375	evio_set (&sigev, sigpipe [0], EV_READ);
		376	evio_start (&sigev);
		377	}
		378
		379	/*****************************************************************************/
		380
		381	static struct ev_idle **idles;
		382	static int idlemax, idlecnt;
		383
		384	static struct ev_prepare **prepares;
		385	static int preparemax, preparecnt;
		386
		387	static struct ev_check **checks;
		388	static int checkmax, checkcnt;
		389
		390	/*****************************************************************************/
		391
		392	static struct ev_child *childs [PID_HASHSIZE];
		393	static struct ev_signal childev;
		394
		395	#ifndef WCONTINUED
		396	# define WCONTINUED 0
		397	#endif
		398
		399	static void
		400	childcb (struct ev_signal *sw, int revents)
		401	{
		402	struct ev_child *w;
		403	int pid, status;
		404
		405	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		406	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		407	if (w->pid == pid \|\| w->pid == -1)
		408	{
		409	w->status = status;
		410	event ((W)w, EV_CHILD);
		411	}
		412	}
		413
		414	/*****************************************************************************/
187		415
188	#if HAVE_EPOLL	416	#if HAVE_EPOLL
189	# include "ev_epoll.c"	417	# include "ev_epoll.c"
190	#endif	418	#endif
191	#if HAVE_SELECT	419	#if HAVE_SELECT
192	# include "ev_select.c"	420	# include "ev_select.c"
193	#endif	421	#endif
194		422
		423	int
		424	ev_version_major (void)
		425	{
		426	return EV_VERSION_MAJOR;
		427	}
		428
		429	int
		430	ev_version_minor (void)
		431	{
		432	return EV_VERSION_MINOR;
		433	}
		434
195	int ev_init (int flags)	435	int ev_init (int flags)
196	{	436	{
		437	if (!ev_method)
		438	{
197	#if HAVE_MONOTONIC	439	#if HAVE_MONOTONIC
198	{	440	{
199	struct timespec ts;	441	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	442	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	443	have_monotonic = 1;
202	}	444	}
203	#endif	445	#endif
204		446
205	ev_now = ev_time ();	447	ev_now = ev_time ();
		448	now = get_clock ();
		449	diff = ev_now - now;
206		450
		451	if (pipe (sigpipe))
		452	return 0;
		453
		454	ev_method = EVMETHOD_NONE;
207	#if HAVE_EPOLL	455	#if HAVE_EPOLL
208	if (epoll_init (flags))	456	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
209	return ev_method;
210	#endif	457	#endif
211	#if HAVE_SELECT	458	#if HAVE_SELECT
212	if (select_init (flags))	459	if (ev_method == EVMETHOD_NONE) select_init (flags);
213	return ev_method;
214	#endif	460	#endif
215		461
216	ev_method = EVMETHOD_NONE;	462	if (ev_method)
		463	{
		464	evw_init (&sigev, sigcb);
		465	siginit ();
		466
		467	evsignal_init (&childev, childcb, SIGCHLD);
		468	evsignal_start (&childev);
		469	}
		470	}
		471
217	return ev_method;	472	return ev_method;
218	}	473	}
219		474
		475	/*****************************************************************************/
		476
		477	void
220	void ev_prefork (void)	478	ev_prefork (void)
221	{	479	{
		480	/* nop */
222	}	481	}
223		482
		483	void
224	void ev_postfork_parent (void)	484	ev_postfork_parent (void)
225	{	485	{
		486	/* nop */
226	}	487	}
227		488
		489	void
228	void ev_postfork_child (void)	490	ev_postfork_child (void)
229	{	491	{
230	#if HAVE_EPOLL	492	#if HAVE_EPOLL
		493	if (ev_method == EVMETHOD_EPOLL)
231	epoll_postfork_child ();	494	epoll_postfork_child ();
232	#endif	495	#endif
233	}
234		496
		497	evio_stop (&sigev);
		498	close (sigpipe [0]);
		499	close (sigpipe [1]);
		500	pipe (sigpipe);
		501	siginit ();
		502	}
		503
		504	/*****************************************************************************/
		505
235	static void	506	static void
236	call_pending ()	507	call_pending (void)
237	{	508	{
238	int i;	509	while (pendingcnt)
239
240	for (i = 0; i < pendingcnt; ++i)
241	{	510	{
242	ANPENDING *p = pendings + i;	511	ANPENDING *p = pendings + --pendingcnt;
243		512
244	if (p->w)	513	if (p->w)
245	{	514	{
246	p->w->pending = 0;	515	p->w->pending = 0;
247	p->w->cb (p->w, p->events);	516	p->w->cb (p->w, p->events);
248	}	517	}
249	}	518	}
250
251	pendingcnt = 0;
252	}	519	}
253		520
254	static void	521	static void
255	timer_reify (void)	522	timers_reify (void)
256	{	523	{
257	while (timercnt && timers [0]->at <= ev_now)	524	while (timercnt && timers [0]->at <= now)
258	{	525	{
259	struct ev_timer *w = timers [0];	526	struct ev_timer *w = timers [0];
260		527
		528	event ((W)w, EV_TIMEOUT);
		529
261	/* first reschedule timer */	530	/* first reschedule or stop timer */
262	if (w->repeat)	531	if (w->repeat)
263	{	532	{
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;	533	w->at = now + w->repeat;
268		534	assert (("timer timeout in the past, negative repeat?", w->at > now));
269	downheap (0);	535	downheap ((WT *)timers, timercnt, 0);
270	}	536	}
271	else	537	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	538	evtimer_stop (w); /* nonrepeating: stop timer */
		539	}
		540	}
273		541
		542	static void
		543	periodics_reify (void)
		544	{
		545	while (periodiccnt && periodics [0]->at <= ev_now)
		546	{
		547	struct ev_periodic *w = periodics [0];
		548
		549	/* first reschedule or stop timer */
		550	if (w->interval)
		551	{
		552	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		553	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
		554	downheap ((WT *)periodics, periodiccnt, 0);
		555	}
		556	else
		557	evperiodic_stop (w); /* nonrepeating: stop timer */
		558
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	559	event ((W)w, EV_TIMEOUT);
		560	}
		561	}
		562
		563	static void
		564	periodics_reschedule (ev_tstamp diff)
		565	{
		566	int i;
		567
		568	/* adjust periodics after time jump */
		569	for (i = 0; i < periodiccnt; ++i)
		570	{
		571	struct ev_periodic *w = periodics [i];
		572
		573	if (w->interval)
		574	{
		575	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		576
		577	if (fabs (diff) >= 1e-4)
		578	{
		579	evperiodic_stop (w);
		580	evperiodic_start (w);
		581
		582	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		583	}
		584	}
		585	}
		586	}
		587
		588	static void
		589	time_update (void)
		590	{
		591	int i;
		592
		593	ev_now = ev_time ();
		594
		595	if (have_monotonic)
		596	{
		597	ev_tstamp odiff = diff;
		598
		599	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		600	{
		601	now = get_clock ();
		602	diff = ev_now - now;
		603
		604	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		605	return; /* all is well */
		606
		607	ev_now = ev_time ();
		608	}
		609
		610	periodics_reschedule (diff - odiff);
		611	/* no timer adjustment, as the monotonic clock doesn't jump */
		612	}
		613	else
		614	{
		615	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
		616	{
		617	periodics_reschedule (ev_now - now);
		618
		619	/* adjust timers. this is easy, as the offset is the same for all */
		620	for (i = 0; i < timercnt; ++i)
		621	timers [i]->at += diff;
		622	}
		623
		624	now = ev_now;
275	}	625	}
276	}	626	}
277		627
278	int ev_loop_done;	628	int ev_loop_done;
279		629
280	int ev_loop (int flags)	630	void ev_loop (int flags)
281	{	631	{
282	double block;	632	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	633	ev_loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
284		634
285	do	635	do
286	{	636	{
		637	/* queue check watchers (and execute them) */
		638	if (preparecnt)
		639	{
		640	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		641	call_pending ();
		642	}
		643
287	/* update fd-related kernel structures */	644	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	645	fd_reify ();
289		646
290	/* calculate blocking time */	647	/* calculate blocking time */
		648
		649	/* we only need this for !monotonic clockor timers, but as we basically
		650	always have timers, we just calculate it always */
291	ev_now = ev_time ();	651	ev_now = ev_time ();
292		652
293	if (flags & EVLOOP_NONBLOCK)	653	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
294	block = 0.;	654	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	655	else
298	{	656	{
		657	block = MAX_BLOCKTIME;
		658
		659	if (timercnt)
		660	{
		661	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
		662	if (block > to) block = to;
		663	}
		664
		665	if (periodiccnt)
		666	{
299	block = timers [0]->at - ev_now + method_fudge;	667	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
		668	if (block > to) block = to;
		669	}
		670
300	if (block < 0.) block = 0.;	671	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	672	}
303		673
304	method_poll (block);	674	method_poll (block);
305		675
		676	/* update ev_now, do magic */
		677	time_update ();
		678
306	/* put pending timers into pendign queue and reschedule them */	679	/* queue pending timers and reschedule them */
307	timer_reify ();	680	timers_reify (); /* relative timers called last */
		681	periodics_reify (); /* absolute timers called first */
308		682
309	ev_now = ev_time ();	683	/* queue idle watchers unless io or timers are pending */
		684	if (!pendingcnt)
		685	queue_events ((W *)idles, idlecnt, EV_IDLE);
		686
		687	/* queue check watchers, to be executed first */
		688	if (checkcnt)
		689	queue_events ((W *)checks, checkcnt, EV_CHECK);
		690
310	call_pending ();	691	call_pending ();
311	}	692	}
312	while (!ev_loop_done);	693	while (!ev_loop_done);
313	}
314		694
		695	if (ev_loop_done != 2)
		696	ev_loop_done = 0;
		697	}
		698
		699	/*****************************************************************************/
		700
315	static void	701	static void
316	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	702	wlist_add (WL *head, WL elem)
317	{	703	{
318	elem->next = *head;	704	elem->next = *head;
319	*head = elem;	705	*head = elem;
320	}	706	}
321		707
322	static void	708	static void
323	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	709	wlist_del (WL *head, WL elem)
324	{	710	{
325	while (*head)	711	while (*head)
326	{	712	{
327	if (*head == elem)	713	if (*head == elem)
328	{	714	{
…		…
333	head = &(*head)->next;	719	head = &(*head)->next;
334	}	720	}
335	}	721	}
336		722
337	static void	723	static void
338	ev_start (struct ev_watcher *w, int active)	724	ev_clear (W w)
339	{	725	{
		726	if (w->pending)
		727	{
		728	pendings [w->pending - 1].w = 0;
340	w->pending = 0;	729	w->pending = 0;
		730	}
		731	}
		732
		733	static void
		734	ev_start (W w, int active)
		735	{
341	w->active = active;	736	w->active = active;
342	}	737	}
343		738
344	static void	739	static void
345	ev_stop (struct ev_watcher *w)	740	ev_stop (W w)
346	{	741	{
347	if (w->pending)
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	742	w->active = 0;
351	/* nop */
352	}	743	}
		744
		745	/*****************************************************************************/
353		746
354	void	747	void
355	evio_start (struct ev_io *w)	748	evio_start (struct ev_io *w)
356	{	749	{
357	if (ev_is_active (w))	750	if (ev_is_active (w))
358	return;	751	return;
359		752
360	int fd = w->fd;	753	int fd = w->fd;
361		754
362	ev_start ((struct ev_watcher *)w, 1);	755	ev_start ((W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	756	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	757	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		758
366	++fdchangecnt;	759	fd_change (fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	760	}
370		761
371	void	762	void
372	evio_stop (struct ev_io *w)	763	evio_stop (struct ev_io *w)
373	{	764	{
		765	ev_clear ((W)w);
374	if (!ev_is_active (w))	766	if (!ev_is_active (w))
375	return;	767	return;
376		768
377	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	769	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	770	ev_stop ((W)w);
379		771
380	++fdchangecnt;	772	fd_change (w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	773	}
384		774
385	void	775	void
386	evtimer_start (struct ev_timer *w)	776	evtimer_start (struct ev_timer *w)
387	{	777	{
388	if (ev_is_active (w))	778	if (ev_is_active (w))
389	return;	779	return;
390		780
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;	781	w->at += now;
399		782
400	ev_start ((struct ev_watcher *)w, ++timercnt);	783	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
		784
		785	ev_start ((W)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );	786	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;	787	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);	788	upheap ((WT *)timers, timercnt - 1);
404	}	789	}
405		790
406	void	791	void
407	evtimer_stop (struct ev_timer *w)	792	evtimer_stop (struct ev_timer *w)
408	{	793	{
		794	ev_clear ((W)w);
409	if (!ev_is_active (w))	795	if (!ev_is_active (w))
410	return;	796	return;
411		797
412	if (w->active < timercnt--)	798	if (w->active < timercnt--)
413	{	799	{
414	timers [w->active - 1] = timers [timercnt];	800	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);	801	downheap ((WT *)timers, timercnt, w->active - 1);
		802	}
		803
		804	w->at = w->repeat;
		805
		806	ev_stop ((W)w);
		807	}
		808
		809	void
		810	evtimer_again (struct ev_timer *w)
		811	{
		812	if (ev_is_active (w))
416	}	813	{
		814	if (w->repeat)
		815	{
		816	w->at = now + w->repeat;
		817	downheap ((WT *)timers, timercnt, w->active - 1);
		818	}
		819	else
		820	evtimer_stop (w);
		821	}
		822	else if (w->repeat)
		823	evtimer_start (w);
		824	}
417		825
418	ev_stop ((struct ev_watcher *)w);	826	void
		827	evperiodic_start (struct ev_periodic *w)
		828	{
		829	if (ev_is_active (w))
		830	return;
		831
		832	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
		833
		834	/* this formula differs from the one in periodic_reify because we do not always round up */
		835	if (w->interval)
		836	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		837
		838	ev_start ((W)w, ++periodiccnt);
		839	array_needsize (periodics, periodicmax, periodiccnt, );
		840	periodics [periodiccnt - 1] = w;
		841	upheap ((WT *)periodics, periodiccnt - 1);
		842	}
		843
		844	void
		845	evperiodic_stop (struct ev_periodic *w)
		846	{
		847	ev_clear ((W)w);
		848	if (!ev_is_active (w))
		849	return;
		850
		851	if (w->active < periodiccnt--)
		852	{
		853	periodics [w->active - 1] = periodics [periodiccnt];
		854	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		855	}
		856
		857	ev_stop ((W)w);
419	}	858	}
420		859
421	void	860	void
422	evsignal_start (struct ev_signal *w)	861	evsignal_start (struct ev_signal *w)
423	{	862	{
424	if (ev_is_active (w))	863	if (ev_is_active (w))
425	return;	864	return;
426		865
427	ev_start ((struct ev_watcher *)w, 1);	866	ev_start ((W)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);	867	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	868	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		869
		870	if (!w->next)
		871	{
		872	struct sigaction sa;
		873	sa.sa_handler = sighandler;
		874	sigfillset (&sa.sa_mask);
		875	sa.sa_flags = 0;
		876	sigaction (w->signum, &sa, 0);
		877	}
430	}	878	}
431		879
432	void	880	void
433	evsignal_stop (struct ev_signal *w)	881	evsignal_stop (struct ev_signal *w)
434	{	882	{
		883	ev_clear ((W)w);
435	if (!ev_is_active (w))	884	if (!ev_is_active (w))
436	return;	885	return;
437		886
438	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	887	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
439	ev_stop ((struct ev_watcher *)w);	888	ev_stop ((W)w);
440	}
441		889
		890	if (!signals [w->signum - 1].head)
		891	signal (w->signum, SIG_DFL);
		892	}
		893
		894	void evidle_start (struct ev_idle *w)
		895	{
		896	if (ev_is_active (w))
		897	return;
		898
		899	ev_start ((W)w, ++idlecnt);
		900	array_needsize (idles, idlemax, idlecnt, );
		901	idles [idlecnt - 1] = w;
		902	}
		903
		904	void evidle_stop (struct ev_idle *w)
		905	{
		906	ev_clear ((W)w);
		907	if (ev_is_active (w))
		908	return;
		909
		910	idles [w->active - 1] = idles [--idlecnt];
		911	ev_stop ((W)w);
		912	}
		913
		914	void evprepare_start (struct ev_prepare *w)
		915	{
		916	if (ev_is_active (w))
		917	return;
		918
		919	ev_start ((W)w, ++preparecnt);
		920	array_needsize (prepares, preparemax, preparecnt, );
		921	prepares [preparecnt - 1] = w;
		922	}
		923
		924	void evprepare_stop (struct ev_prepare *w)
		925	{
		926	ev_clear ((W)w);
		927	if (ev_is_active (w))
		928	return;
		929
		930	prepares [w->active - 1] = prepares [--preparecnt];
		931	ev_stop ((W)w);
		932	}
		933
		934	void evcheck_start (struct ev_check *w)
		935	{
		936	if (ev_is_active (w))
		937	return;
		938
		939	ev_start ((W)w, ++checkcnt);
		940	array_needsize (checks, checkmax, checkcnt, );
		941	checks [checkcnt - 1] = w;
		942	}
		943
		944	void evcheck_stop (struct ev_check *w)
		945	{
		946	ev_clear ((W)w);
		947	if (ev_is_active (w))
		948	return;
		949
		950	checks [w->active - 1] = checks [--checkcnt];
		951	ev_stop ((W)w);
		952	}
		953
		954	void evchild_start (struct ev_child *w)
		955	{
		956	if (ev_is_active (w))
		957	return;
		958
		959	ev_start ((W)w, 1);
		960	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		961	}
		962
		963	void evchild_stop (struct ev_child *w)
		964	{
		965	ev_clear ((W)w);
		966	if (ev_is_active (w))
		967	return;
		968
		969	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		970	ev_stop ((W)w);
		971	}
		972
442	/*****************************************************************************/	973	/*****************************************************************************/
		974
		975	struct ev_once
		976	{
		977	struct ev_io io;
		978	struct ev_timer to;
		979	void (cb)(int revents, void arg);
		980	void *arg;
		981	};
		982
		983	static void
		984	once_cb (struct ev_once *once, int revents)
		985	{
		986	void (cb)(int revents, void arg) = once->cb;
		987	void *arg = once->arg;
		988
		989	evio_stop (&once->io);
		990	evtimer_stop (&once->to);
		991	free (once);
		992
		993	cb (revents, arg);
		994	}
		995
		996	static void
		997	once_cb_io (struct ev_io *w, int revents)
		998	{
		999	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1000	}
		1001
		1002	static void
		1003	once_cb_to (struct ev_timer *w, int revents)
		1004	{
		1005	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1006	}
		1007
		1008	void
		1009	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1010	{
		1011	struct ev_once *once = malloc (sizeof (struct ev_once));
		1012
		1013	if (!once)
		1014	cb (EV_ERROR, arg);
		1015	else
		1016	{
		1017	once->cb = cb;
		1018	once->arg = arg;
		1019
		1020	evw_init (&once->io, once_cb_io);
		1021
		1022	if (fd >= 0)
		1023	{
		1024	evio_set (&once->io, fd, events);
		1025	evio_start (&once->io);
		1026	}
		1027
		1028	evw_init (&once->to, once_cb_to);
		1029
		1030	if (timeout >= 0.)
		1031	{
		1032	evtimer_set (&once->to, timeout, 0.);
		1033	evtimer_start (&once->to);
		1034	}
		1035	}
		1036	}
		1037
		1038	/*****************************************************************************/
		1039
443	#if 1	1040	#if 0
		1041
		1042	struct ev_io wio;
444		1043
445	static void	1044	static void
446	sin_cb (struct ev_io *w, int revents)	1045	sin_cb (struct ev_io *w, int revents)
447	{	1046	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1047	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}	1048	}
450		1049
451	static void	1050	static void
452	ocb (struct ev_timer *w, int revents)	1051	ocb (struct ev_timer *w, int revents)
453	{	1052	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1053	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1054	evtimer_stop (w);
		1055	evtimer_start (w);
		1056	}
		1057
		1058	static void
		1059	scb (struct ev_signal *w, int revents)
		1060	{
		1061	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1062	evio_stop (&wio);
		1063	evio_start (&wio);
		1064	}
		1065
		1066	static void
		1067	gcb (struct ev_signal *w, int revents)
		1068	{
		1069	fprintf (stderr, "generic %x\n", revents);
		1070
455	}	1071	}
456		1072
457	int main (void)	1073	int main (void)
458	{	1074	{
459	struct ev_io sin;
460
461	ev_init (0);	1075	ev_init (0);
462		1076
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);	1077	evio_init (&wio, sin_cb, 0, EV_READ);
465	evio_start (&sin);	1078	evio_start (&wio);
466		1079
467	struct ev_timer t[1000];	1080	struct ev_timer t[10000];
468		1081
		1082	#if 0
469	int i;	1083	int i;
470	for (i = 0; i < 1000; ++i)	1084	for (i = 0; i < 10000; ++i)
471	{	1085	{
472	struct ev_timer *w = t + i;	1086	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);	1087	evw_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);	1088	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
475	evtimer_start (w);	1089	evtimer_start (w);
476	if (drand48 () < 0.5)	1090	if (drand48 () < 0.5)
477	evtimer_stop (w);	1091	evtimer_stop (w);
478	}	1092	}
		1093	#endif
		1094
		1095	struct ev_timer t1;
		1096	evtimer_init (&t1, ocb, 5, 10);
		1097	evtimer_start (&t1);
		1098
		1099	struct ev_signal sig;
		1100	evsignal_init (&sig, scb, SIGQUIT);
		1101	evsignal_start (&sig);
		1102
		1103	struct ev_check cw;
		1104	evcheck_init (&cw, gcb);
		1105	evcheck_start (&cw);
		1106
		1107	struct ev_idle iw;
		1108	evidle_init (&iw, gcb);
		1109	evidle_start (&iw);
479		1110
480	ev_loop (0);	1111	ev_loop (0);
481		1112
482	return 0;	1113	return 0;
483	}	1114	}

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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 1.27 by root, Wed Oct 31 22:16:36 2007 UTC

Diff Legend

Comparing libev/ev.c (file contents):
Revision 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs.
Revision 1.27 by root, Wed Oct 31 22:16:36 2007 UTC