[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 1.22 by root, Wed Oct 31 19:07:43 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
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 ? cur << 1 : 16; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\
73	base = realloc (base, sizeof (base) (newcnt)); \	119	base = realloc (base, sizeof (base) (newcnt)); \
74	init (base + cur, newcnt - cur); \	120	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	121	cur = newcnt; \
76	}	122	}
77		123
		124	/*****************************************************************************/
		125
78	typedef struct	126	typedef struct
79	{	127	{
80	struct ev_io *head;	128	struct ev_io *head;
81	unsigned char wev, rev; /* want, received event set */	129	unsigned char wev, rev; /* want, received event set */
82	} ANFD;	130	} ANFD;
…		…
98	}	146	}
99	}	147	}
100		148
101	typedef struct	149	typedef struct
102	{	150	{
103	struct ev_watcher *w;	151	W w;
104	int events;	152	int events;
105	} ANPENDING;	153	} ANPENDING;
106		154
107	static ANPENDING *pendings;	155	static ANPENDING *pendings;
108	static int pendingmax, pendingcnt;	156	static int pendingmax, pendingcnt;
109		157
110	static void	158	static void
111	event (struct ev_watcher *w, int events)	159	event (W w, int events)
112	{	160	{
		161	if (w->active)
		162	{
113	w->pending = ++pendingcnt;	163	w->pending = ++pendingcnt;
114	array_needsize (pendings, pendingmax, pendingcnt, );	164	array_needsize (pendings, pendingmax, pendingcnt, );
115	pendings [pendingcnt - 1].w = w;	165	pendings [pendingcnt - 1].w = w;
116	pendings [pendingcnt - 1].events = events;	166	pendings [pendingcnt - 1].events = events;
		167	}
117	}	168	}
118		169
119	static void	170	static void
120	fd_event (int fd, int events)	171	fd_event (int fd, int events)
121	{	172	{
…		…
125	for (w = anfd->head; w; w = w->next)	176	for (w = anfd->head; w; w = w->next)
126	{	177	{
127	int ev = w->events & events;	178	int ev = w->events & events;
128		179
129	if (ev)	180	if (ev)
130	event ((struct ev_watcher *)w, ev);	181	event ((W)w, ev);
131	}	182	}
132	}	183	}
		184
		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	/* called on EBADF to verify fds */
		195	static void
		196	fd_recheck ()
		197	{
		198	int fd;
		199
		200	for (fd = 0; fd < anfdmax; ++fd)
		201	if (anfds [fd].wev)
		202	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		203	while (anfds [fd].head)
		204	evio_stop (anfds [fd].head);
		205	}
		206
		207	/*****************************************************************************/
133		208
134	static struct ev_timer **timers;	209	static struct ev_timer **timers;
135	static int timermax, timercnt;	210	static int timermax, timercnt;
136		211
		212	static struct ev_periodic **periodics;
		213	static int periodicmax, periodiccnt;
		214
137	static void	215	static void
138	upheap (int k)	216	upheap (WT *timers, int k)
139	{	217	{
140	struct ev_timer *w = timers [k];	218	WT w = timers [k];
141		219
142	while (k && timers [k >> 1]->at > w->at)	220	while (k && timers [k >> 1]->at > w->at)
143	{	221	{
144	timers [k] = timers [k >> 1];	222	timers [k] = timers [k >> 1];
145	timers [k]->active = k + 1;	223	timers [k]->active = k + 1;
…		…
150	timers [k]->active = k + 1;	228	timers [k]->active = k + 1;
151		229
152	}	230	}
153		231
154	static void	232	static void
155	downheap (int k)	233	downheap (WT *timers, int N, int k)
156	{	234	{
157	struct ev_timer *w = timers [k];	235	WT w = timers [k];
158		236
159	while (k < (timercnt >> 1))	237	while (k < (N >> 1))
160	{	238	{
161	int j = k << 1;	239	int j = k << 1;
162		240
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	241	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
164	++j;	242	++j;
165		243
166	if (w->at <= timers [j]->at)	244	if (w->at <= timers [j]->at)
167	break;	245	break;
168		246
…		…
173		251
174	timers [k] = w;	252	timers [k] = w;
175	timers [k]->active = k + 1;	253	timers [k]->active = k + 1;
176	}	254	}
177		255
178	static struct ev_signal **signals;	256	/*****************************************************************************/
		257
		258	typedef struct
		259	{
		260	struct ev_signal *head;
		261	sig_atomic_t gotsig;
		262	} ANSIG;
		263
		264	static ANSIG *signals;
179	static int signalmax, signalcnt;	265	static int signalmax;
180		266
		267	static int sigpipe [2];
		268	static sig_atomic_t gotsig;
		269	static struct ev_io sigev;
		270
181	static void	271	static void
182	signals_init (struct ev_signal **base, int count)	272	signals_init (ANSIG *base, int count)
183	{	273	{
184	while (count--)	274	while (count--)
185	*base++ = 0;	275	{
		276	base->head = 0;
		277	base->gotsig = 0;
		278	++base;
		279	}
186	}	280	}
		281
		282	static void
		283	sighandler (int signum)
		284	{
		285	signals [signum - 1].gotsig = 1;
		286
		287	if (!gotsig)
		288	{
		289	gotsig = 1;
		290	write (sigpipe [1], &gotsig, 1);
		291	}
		292	}
		293
		294	static void
		295	sigcb (struct ev_io *iow, int revents)
		296	{
		297	struct ev_signal *w;
		298	int sig;
		299
		300	gotsig = 0;
		301	read (sigpipe [0], &revents, 1);
		302
		303	for (sig = signalmax; sig--; )
		304	if (signals [sig].gotsig)
		305	{
		306	signals [sig].gotsig = 0;
		307
		308	for (w = signals [sig].head; w; w = w->next)
		309	event ((W)w, EV_SIGNAL);
		310	}
		311	}
		312
		313	static void
		314	siginit (void)
		315	{
		316	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		317	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		318
		319	/* rather than sort out wether we really need nb, set it */
		320	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		321	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		322
		323	evio_set (&sigev, sigpipe [0], EV_READ);
		324	evio_start (&sigev);
		325	}
		326
		327	/*****************************************************************************/
		328
		329	static struct ev_idle **idles;
		330	static int idlemax, idlecnt;
		331
		332	static struct ev_prepare **prepares;
		333	static int preparemax, preparecnt;
		334
		335	static struct ev_check **checks;
		336	static int checkmax, checkcnt;
		337
		338	/*****************************************************************************/
		339
		340	static struct ev_child *childs [PID_HASHSIZE];
		341	static struct ev_signal childev;
		342
		343	#ifndef WCONTINUED
		344	# define WCONTINUED 0
		345	#endif
		346
		347	static void
		348	childcb (struct ev_signal *sw, int revents)
		349	{
		350	struct ev_child *w;
		351	int pid, status;
		352
		353	while ((pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)) != -1)
		354	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		355	if (w->pid == pid \|\| w->pid == -1)
		356	{
		357	w->status = status;
		358	event ((W)w, EV_CHILD);
		359	}
		360	}
		361
		362	/*****************************************************************************/
187		363
188	#if HAVE_EPOLL	364	#if HAVE_EPOLL
189	# include "ev_epoll.c"	365	# include "ev_epoll.c"
190	#endif	366	#endif
191	#if HAVE_SELECT	367	#if HAVE_SELECT
…		…
201	have_monotonic = 1;	377	have_monotonic = 1;
202	}	378	}
203	#endif	379	#endif
204		380
205	ev_now = ev_time ();	381	ev_now = ev_time ();
		382	now = get_clock ();
		383	diff = ev_now - now;
206		384
		385	if (pipe (sigpipe))
		386	return 0;
		387
		388	ev_method = EVMETHOD_NONE;
207	#if HAVE_EPOLL	389	#if HAVE_EPOLL
208	if (epoll_init (flags))	390	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
209	return ev_method;
210	#endif	391	#endif
211	#if HAVE_SELECT	392	#if HAVE_SELECT
212	if (select_init (flags))	393	if (ev_method == EVMETHOD_NONE) select_init (flags);
213	return ev_method;
214	#endif	394	#endif
215		395
216	ev_method = EVMETHOD_NONE;	396	if (ev_method)
		397	{
		398	evw_init (&sigev, sigcb);
		399	siginit ();
		400
		401	evsignal_init (&childev, childcb, SIGCHLD);
		402	evsignal_start (&childev);
		403	}
		404
217	return ev_method;	405	return ev_method;
218	}	406	}
219		407
		408	/*****************************************************************************/
		409
220	void ev_prefork (void)	410	void ev_prefork (void)
221	{	411	{
		412	/* nop */
222	}	413	}
223		414
224	void ev_postfork_parent (void)	415	void ev_postfork_parent (void)
225	{	416	{
		417	/* nop */
226	}	418	}
227		419
228	void ev_postfork_child (void)	420	void ev_postfork_child (void)
229	{	421	{
230	#if HAVE_EPOLL	422	#if HAVE_EPOLL
		423	if (ev_method == EVMETHOD_EPOLL)
231	epoll_postfork_child ();	424	epoll_postfork_child ();
232	#endif	425	#endif
		426
		427	evio_stop (&sigev);
		428	close (sigpipe [0]);
		429	close (sigpipe [1]);
		430	pipe (sigpipe);
		431	siginit ();
		432	}
		433
		434	/*****************************************************************************/
		435
		436	static void
		437	fd_reify (void)
		438	{
		439	int i;
		440
		441	for (i = 0; i < fdchangecnt; ++i)
		442	{
		443	int fd = fdchanges [i];
		444	ANFD *anfd = anfds + fd;
		445	struct ev_io *w;
		446
		447	int wev = 0;
		448
		449	for (w = anfd->head; w; w = w->next)
		450	wev \|= w->events;
		451
		452	if (anfd->wev != wev)
		453	{
		454	method_modify (fd, anfd->wev, wev);
		455	anfd->wev = wev;
		456	}
		457	}
		458
		459	fdchangecnt = 0;
233	}	460	}
234		461
235	static void	462	static void
236	call_pending ()	463	call_pending ()
237	{	464	{
238	int i;	465	while (pendingcnt)
239
240	for (i = 0; i < pendingcnt; ++i)
241	{	466	{
242	ANPENDING *p = pendings + i;	467	ANPENDING *p = pendings + --pendingcnt;
243		468
244	if (p->w)	469	if (p->w)
245	{	470	{
246	p->w->pending = 0;	471	p->w->pending = 0;
247	p->w->cb (p->w, p->events);	472	p->w->cb (p->w, p->events);
248	}	473	}
249	}	474	}
250
251	pendingcnt = 0;
252	}	475	}
253		476
254	static void	477	static void
255	timer_reify (void)	478	timers_reify ()
256	{	479	{
257	while (timercnt && timers [0]->at <= ev_now)	480	while (timercnt && timers [0]->at <= now)
258	{	481	{
259	struct ev_timer *w = timers [0];	482	struct ev_timer *w = timers [0];
260		483
		484	event ((W)w, EV_TIMEOUT);
		485
261	/* first reschedule timer */	486	/* first reschedule or stop timer */
262	if (w->repeat)	487	if (w->repeat)
263	{	488	{
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;	489	w->at = now + w->repeat;
268		490	assert (("timer timeout in the past, negative repeat?", w->at > now));
269	downheap (0);	491	downheap ((WT *)timers, timercnt, 0);
270	}	492	}
271	else	493	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	494	evtimer_stop (w); /* nonrepeating: stop timer */
		495	}
		496	}
273		497
		498	static void
		499	periodics_reify ()
		500	{
		501	while (periodiccnt && periodics [0]->at <= ev_now)
		502	{
		503	struct ev_periodic *w = periodics [0];
		504
		505	/* first reschedule or stop timer */
		506	if (w->interval)
		507	{
		508	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		509	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
		510	downheap ((WT *)periodics, periodiccnt, 0);
		511	}
		512	else
		513	evperiodic_stop (w); /* nonrepeating: stop timer */
		514
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	515	event ((W)w, EV_TIMEOUT);
		516	}
		517	}
		518
		519	static void
		520	periodics_reschedule (ev_tstamp diff)
		521	{
		522	int i;
		523
		524	/* adjust periodics after time jump */
		525	for (i = 0; i < periodiccnt; ++i)
		526	{
		527	struct ev_periodic *w = periodics [i];
		528
		529	if (w->interval)
		530	{
		531	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
		532
		533	if (fabs (diff) >= 1e-4)
		534	{
		535	evperiodic_stop (w);
		536	evperiodic_start (w);
		537
		538	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		539	}
		540	}
		541	}
		542	}
		543
		544	static void
		545	time_update ()
		546	{
		547	int i;
		548
		549	ev_now = ev_time ();
		550
		551	if (have_monotonic)
		552	{
		553	ev_tstamp odiff = diff;
		554
		555	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		556	{
		557	now = get_clock ();
		558	diff = ev_now - now;
		559
		560	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		561	return; /* all is well */
		562
		563	ev_now = ev_time ();
		564	}
		565
		566	periodics_reschedule (diff - odiff);
		567	/* no timer adjustment, as the monotonic clock doesn't jump */
		568	}
		569	else
		570	{
		571	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
		572	{
		573	periodics_reschedule (ev_now - now);
		574
		575	/* adjust timers. this is easy, as the offset is the same for all */
		576	for (i = 0; i < timercnt; ++i)
		577	timers [i]->at += diff;
		578	}
		579
		580	now = ev_now;
275	}	581	}
276	}	582	}
277		583
278	int ev_loop_done;	584	int ev_loop_done;
279		585
280	int ev_loop (int flags)	586	void ev_loop (int flags)
281	{	587	{
282	double block;	588	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	589	ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;
284		590
285	do	591	do
286	{	592	{
		593	/* queue check watchers (and execute them) */
		594	if (preparecnt)
		595	{
		596	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		597	call_pending ();
		598	}
		599
287	/* update fd-related kernel structures */	600	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	601	fd_reify ();
289		602
290	/* calculate blocking time */	603	/* calculate blocking time */
		604
		605	/* we only need this for !monotonic clockor timers, but as we basically
		606	always have timers, we just calculate it always */
291	ev_now = ev_time ();	607	ev_now = ev_time ();
292		608
293	if (flags & EVLOOP_NONBLOCK)	609	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
294	block = 0.;	610	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	611	else
298	{	612	{
		613	block = MAX_BLOCKTIME;
		614
		615	if (timercnt)
		616	{
		617	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
		618	if (block > to) block = to;
		619	}
		620
		621	if (periodiccnt)
		622	{
299	block = timers [0]->at - ev_now + method_fudge;	623	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
		624	if (block > to) block = to;
		625	}
		626
300	if (block < 0.) block = 0.;	627	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	628	}
303		629
304	method_poll (block);	630	method_poll (block);
305		631
		632	/* update ev_now, do magic */
		633	time_update ();
		634
306	/* put pending timers into pendign queue and reschedule them */	635	/* queue pending timers and reschedule them */
307	timer_reify ();	636	timers_reify (); /* relative timers called last */
		637	periodics_reify (); /* absolute timers called first */
308		638
309	ev_now = ev_time ();	639	/* queue idle watchers unless io or timers are pending */
		640	if (!pendingcnt)
		641	queue_events ((W *)idles, idlecnt, EV_IDLE);
		642
		643	/* queue check watchers, to be executed first */
		644	if (checkcnt)
		645	queue_events ((W *)checks, checkcnt, EV_CHECK);
		646
310	call_pending ();	647	call_pending ();
311	}	648	}
312	while (!ev_loop_done);	649	while (!ev_loop_done);
313	}
314		650
		651	if (ev_loop_done != 2)
		652	ev_loop_done = 0;
		653	}
		654
		655	/*****************************************************************************/
		656
315	static void	657	static void
316	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	658	wlist_add (WL *head, WL elem)
317	{	659	{
318	elem->next = *head;	660	elem->next = *head;
319	*head = elem;	661	*head = elem;
320	}	662	}
321		663
322	static void	664	static void
323	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	665	wlist_del (WL *head, WL elem)
324	{	666	{
325	while (*head)	667	while (*head)
326	{	668	{
327	if (*head == elem)	669	if (*head == elem)
328	{	670	{
…		…
333	head = &(*head)->next;	675	head = &(*head)->next;
334	}	676	}
335	}	677	}
336		678
337	static void	679	static void
338	ev_start (struct ev_watcher *w, int active)	680	ev_clear (W w)
339	{	681	{
		682	if (w->pending)
		683	{
		684	pendings [w->pending - 1].w = 0;
340	w->pending = 0;	685	w->pending = 0;
		686	}
		687	}
		688
		689	static void
		690	ev_start (W w, int active)
		691	{
341	w->active = active;	692	w->active = active;
342	}	693	}
343		694
344	static void	695	static void
345	ev_stop (struct ev_watcher *w)	696	ev_stop (W w)
346	{	697	{
347	if (w->pending)
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	698	w->active = 0;
351	/* nop */
352	}	699	}
		700
		701	/*****************************************************************************/
353		702
354	void	703	void
355	evio_start (struct ev_io *w)	704	evio_start (struct ev_io *w)
356	{	705	{
357	if (ev_is_active (w))	706	if (ev_is_active (w))
358	return;	707	return;
359		708
360	int fd = w->fd;	709	int fd = w->fd;
361		710
362	ev_start ((struct ev_watcher *)w, 1);	711	ev_start ((W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	712	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	713	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		714
366	++fdchangecnt;	715	++fdchangecnt;
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	716	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;	717	fdchanges [fdchangecnt - 1] = fd;
369	}	718	}
370		719
371	void	720	void
372	evio_stop (struct ev_io *w)	721	evio_stop (struct ev_io *w)
373	{	722	{
		723	ev_clear ((W)w);
374	if (!ev_is_active (w))	724	if (!ev_is_active (w))
375	return;	725	return;
376		726
377	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	727	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	728	ev_stop ((W)w);
379		729
380	++fdchangecnt;	730	++fdchangecnt;
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	731	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;	732	fdchanges [fdchangecnt - 1] = w->fd;
383	}	733	}
…		…
386	evtimer_start (struct ev_timer *w)	736	evtimer_start (struct ev_timer *w)
387	{	737	{
388	if (ev_is_active (w))	738	if (ev_is_active (w))
389	return;	739	return;
390		740
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;	741	w->at += now;
399		742
400	ev_start ((struct ev_watcher *)w, ++timercnt);	743	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
		744
		745	ev_start ((W)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );	746	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;	747	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);	748	upheap ((WT *)timers, timercnt - 1);
404	}	749	}
405		750
406	void	751	void
407	evtimer_stop (struct ev_timer *w)	752	evtimer_stop (struct ev_timer *w)
408	{	753	{
		754	ev_clear ((W)w);
409	if (!ev_is_active (w))	755	if (!ev_is_active (w))
410	return;	756	return;
411		757
412	if (w->active < timercnt--)	758	if (w->active < timercnt--)
413	{	759	{
414	timers [w->active - 1] = timers [timercnt];	760	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);	761	downheap ((WT *)timers, timercnt, w->active - 1);
		762	}
		763
		764	w->at = w->repeat;
		765
		766	ev_stop ((W)w);
		767	}
		768
		769	void
		770	evtimer_again (struct ev_timer *w)
		771	{
		772	if (ev_is_active (w))
416	}	773	{
		774	if (w->repeat)
		775	{
		776	w->at = now + w->repeat;
		777	downheap ((WT *)timers, timercnt, w->active - 1);
		778	}
		779	else
		780	evtimer_stop (w);
		781	}
		782	else if (w->repeat)
		783	evtimer_start (w);
		784	}
417		785
418	ev_stop ((struct ev_watcher *)w);	786	void
		787	evperiodic_start (struct ev_periodic *w)
		788	{
		789	if (ev_is_active (w))
		790	return;
		791
		792	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
		793
		794	/* this formula differs from the one in periodic_reify because we do not always round up */
		795	if (w->interval)
		796	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		797
		798	ev_start ((W)w, ++periodiccnt);
		799	array_needsize (periodics, periodicmax, periodiccnt, );
		800	periodics [periodiccnt - 1] = w;
		801	upheap ((WT *)periodics, periodiccnt - 1);
		802	}
		803
		804	void
		805	evperiodic_stop (struct ev_periodic *w)
		806	{
		807	ev_clear ((W)w);
		808	if (!ev_is_active (w))
		809	return;
		810
		811	if (w->active < periodiccnt--)
		812	{
		813	periodics [w->active - 1] = periodics [periodiccnt];
		814	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		815	}
		816
		817	ev_stop ((W)w);
419	}	818	}
420		819
421	void	820	void
422	evsignal_start (struct ev_signal *w)	821	evsignal_start (struct ev_signal *w)
423	{	822	{
424	if (ev_is_active (w))	823	if (ev_is_active (w))
425	return;	824	return;
426		825
427	ev_start ((struct ev_watcher *)w, 1);	826	ev_start ((W)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);	827	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	828	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		829
		830	if (!w->next)
		831	{
		832	struct sigaction sa;
		833	sa.sa_handler = sighandler;
		834	sigfillset (&sa.sa_mask);
		835	sa.sa_flags = 0;
		836	sigaction (w->signum, &sa, 0);
		837	}
430	}	838	}
431		839
432	void	840	void
433	evsignal_stop (struct ev_signal *w)	841	evsignal_stop (struct ev_signal *w)
434	{	842	{
		843	ev_clear ((W)w);
435	if (!ev_is_active (w))	844	if (!ev_is_active (w))
436	return;	845	return;
437		846
438	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);	847	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
439	ev_stop ((struct ev_watcher *)w);	848	ev_stop ((W)w);
440	}
441		849
		850	if (!signals [w->signum - 1].head)
		851	signal (w->signum, SIG_DFL);
		852	}
		853
		854	void evidle_start (struct ev_idle *w)
		855	{
		856	if (ev_is_active (w))
		857	return;
		858
		859	ev_start ((W)w, ++idlecnt);
		860	array_needsize (idles, idlemax, idlecnt, );
		861	idles [idlecnt - 1] = w;
		862	}
		863
		864	void evidle_stop (struct ev_idle *w)
		865	{
		866	ev_clear ((W)w);
		867	if (ev_is_active (w))
		868	return;
		869
		870	idles [w->active - 1] = idles [--idlecnt];
		871	ev_stop ((W)w);
		872	}
		873
		874	void evprepare_start (struct ev_prepare *w)
		875	{
		876	if (ev_is_active (w))
		877	return;
		878
		879	ev_start ((W)w, ++preparecnt);
		880	array_needsize (prepares, preparemax, preparecnt, );
		881	prepares [preparecnt - 1] = w;
		882	}
		883
		884	void evprepare_stop (struct ev_prepare *w)
		885	{
		886	ev_clear ((W)w);
		887	if (ev_is_active (w))
		888	return;
		889
		890	prepares [w->active - 1] = prepares [--preparecnt];
		891	ev_stop ((W)w);
		892	}
		893
		894	void evcheck_start (struct ev_check *w)
		895	{
		896	if (ev_is_active (w))
		897	return;
		898
		899	ev_start ((W)w, ++checkcnt);
		900	array_needsize (checks, checkmax, checkcnt, );
		901	checks [checkcnt - 1] = w;
		902	}
		903
		904	void evcheck_stop (struct ev_check *w)
		905	{
		906	ev_clear ((W)w);
		907	if (ev_is_active (w))
		908	return;
		909
		910	checks [w->active - 1] = checks [--checkcnt];
		911	ev_stop ((W)w);
		912	}
		913
		914	void evchild_start (struct ev_child *w)
		915	{
		916	if (ev_is_active (w))
		917	return;
		918
		919	ev_start ((W)w, 1);
		920	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		921	}
		922
		923	void evchild_stop (struct ev_child *w)
		924	{
		925	ev_clear ((W)w);
		926	if (ev_is_active (w))
		927	return;
		928
		929	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		930	ev_stop ((W)w);
		931	}
		932
442	/*****************************************************************************/	933	/*****************************************************************************/
		934
		935	struct ev_once
		936	{
		937	struct ev_io io;
		938	struct ev_timer to;
		939	void (cb)(int revents, void arg);
		940	void *arg;
		941	};
		942
		943	static void
		944	once_cb (struct ev_once *once, int revents)
		945	{
		946	void (cb)(int revents, void arg) = once->cb;
		947	void *arg = once->arg;
		948
		949	evio_stop (&once->io);
		950	evtimer_stop (&once->to);
		951	free (once);
		952
		953	cb (revents, arg);
		954	}
		955
		956	static void
		957	once_cb_io (struct ev_io *w, int revents)
		958	{
		959	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		960	}
		961
		962	static void
		963	once_cb_to (struct ev_timer *w, int revents)
		964	{
		965	once_cb ((struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		966	}
		967
		968	void
		969	ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		970	{
		971	struct ev_once *once = malloc (sizeof (struct ev_once));
		972
		973	if (!once)
		974	cb (EV_ERROR, arg);
		975	else
		976	{
		977	once->cb = cb;
		978	once->arg = arg;
		979
		980	evw_init (&once->io, once_cb_io);
		981
		982	if (fd >= 0)
		983	{
		984	evio_set (&once->io, fd, events);
		985	evio_start (&once->io);
		986	}
		987
		988	evw_init (&once->to, once_cb_to);
		989
		990	if (timeout >= 0.)
		991	{
		992	evtimer_set (&once->to, timeout, 0.);
		993	evtimer_start (&once->to);
		994	}
		995	}
		996	}
		997
		998	/*****************************************************************************/
		999
443	#if 1	1000	#if 0
		1001
		1002	struct ev_io wio;
444		1003
445	static void	1004	static void
446	sin_cb (struct ev_io *w, int revents)	1005	sin_cb (struct ev_io *w, int revents)
447	{	1006	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1007	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}	1008	}
450		1009
451	static void	1010	static void
452	ocb (struct ev_timer *w, int revents)	1011	ocb (struct ev_timer *w, int revents)
453	{	1012	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1013	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1014	evtimer_stop (w);
		1015	evtimer_start (w);
		1016	}
		1017
		1018	static void
		1019	scb (struct ev_signal *w, int revents)
		1020	{
		1021	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1022	evio_stop (&wio);
		1023	evio_start (&wio);
		1024	}
		1025
		1026	static void
		1027	gcb (struct ev_signal *w, int revents)
		1028	{
		1029	fprintf (stderr, "generic %x\n", revents);
		1030
455	}	1031	}
456		1032
457	int main (void)	1033	int main (void)
458	{	1034	{
459	struct ev_io sin;
460
461	ev_init (0);	1035	ev_init (0);
462		1036
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);	1037	evio_init (&wio, sin_cb, 0, EV_READ);
465	evio_start (&sin);	1038	evio_start (&wio);
466		1039
467	struct ev_timer t[1000];	1040	struct ev_timer t[10000];
468		1041
		1042	#if 0
469	int i;	1043	int i;
470	for (i = 0; i < 1000; ++i)	1044	for (i = 0; i < 10000; ++i)
471	{	1045	{
472	struct ev_timer *w = t + i;	1046	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);	1047	evw_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);	1048	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
475	evtimer_start (w);	1049	evtimer_start (w);
476	if (drand48 () < 0.5)	1050	if (drand48 () < 0.5)
477	evtimer_stop (w);	1051	evtimer_stop (w);
478	}	1052	}
		1053	#endif
		1054
		1055	struct ev_timer t1;
		1056	evtimer_init (&t1, ocb, 5, 10);
		1057	evtimer_start (&t1);
		1058
		1059	struct ev_signal sig;
		1060	evsignal_init (&sig, scb, SIGQUIT);
		1061	evsignal_start (&sig);
		1062
		1063	struct ev_check cw;
		1064	evcheck_init (&cw, gcb);
		1065	evcheck_start (&cw);
		1066
		1067	struct ev_idle iw;
		1068	evidle_init (&iw, gcb);
		1069	evidle_start (&iw);
479		1070
480	ev_loop (0);	1071	ev_loop (0);
481		1072
482	return 0;	1073	return 0;
483	}	1074	}

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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 1.22 by root, Wed Oct 31 19:07:43 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 1.22 by root, Wed Oct 31 19:07:43 2007 UTC