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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 1.45 by root, Sat Nov 3 09:19:58 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#if EV_USE_CONFIG_H
		32	# include "config.h"
		33	#endif
		34
1	#include <math.h>	35	#include <math.h>
2	#include <stdlib.h>	36	#include <stdlib.h>
		37	#include <unistd.h>
		38	#include <fcntl.h>
		39	#include <signal.h>
		40	#include <stddef.h>
3		41
4	#include <stdio.h>	42	#include <stdio.h>
5		43
		44	#include <assert.h>
6	#include <errno.h>	45	#include <errno.h>
		46	#include <sys/types.h>
		47	#ifndef WIN32
		48	# include <sys/wait.h>
		49	#endif
7	#include <sys/time.h>	50	#include <sys/time.h>
8	#include <time.h>	51	#include <time.h>
9		52
		53	/**/
		54
		55	#ifndef EV_USE_MONOTONIC
		56	# define EV_USE_MONOTONIC 1
		57	#endif
		58
		59	#ifndef EV_USE_SELECT
		60	# define EV_USE_SELECT 1
		61	#endif
		62
		63	#ifndef EV_USE_POLL
		64	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		65	#endif
		66
		67	#ifndef EV_USE_EPOLL
		68	# define EV_USE_EPOLL 0
		69	#endif
		70
		71	#ifndef EV_USE_KQUEUE
		72	# define EV_USE_KQUEUE 0
		73	#endif
		74
		75	#ifndef EV_USE_REALTIME
		76	# define EV_USE_REALTIME 1
		77	#endif
		78
		79	/**/
		80
10	#ifdef CLOCK_MONOTONIC	81	#ifndef CLOCK_MONOTONIC
		82	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	83	# define EV_USE_MONOTONIC 0
12	#endif	84	#endif
13		85
14	#define HAVE_EPOLL 1	86	#ifndef CLOCK_REALTIME
		87	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	88	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	89	#endif
17		90
18	#define MAX_BLOCKTIME 60.	91	/**/
		92
		93	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		94	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		95	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		96	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
19		97
20	#include "ev.h"	98	#include "ev.h"
21		99
		100	#if __GNUC__ >= 3
		101	# define expect(expr,value) __builtin_expect ((expr),(value))
		102	# define inline inline
		103	#else
		104	# define expect(expr,value) (expr)
		105	# define inline static
		106	#endif
		107
		108	#define expect_false(expr) expect ((expr) != 0, 0)
		109	#define expect_true(expr) expect ((expr) != 0, 1)
		110
		111	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		112	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		113
22	struct ev_watcher {	114	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	115	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	116	typedef struct ev_watcher_time *WT;
28	};
29		117
		118	static ev_tstamp now_floor, now, diff; /* monotonic clock */
30	ev_tstamp ev_now;	119	ev_tstamp ev_now;
31	int ev_method;	120	int ev_method;
32		121
33	static int have_monotonic; /* runtime */	122	static int have_monotonic; /* runtime */
34		123
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	124	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
36	static void (*method_reify)(void);	125	static void (*method_modify)(int fd, int oev, int nev);
37	static void (*method_poll)(ev_tstamp timeout);	126	static void (*method_poll)(ev_tstamp timeout);
		127
		128	/*****************************************************************************/
38		129
39	ev_tstamp	130	ev_tstamp
40	ev_time (void)	131	ev_time (void)
41	{	132	{
42	#if HAVE_REALTIME	133	#if EV_USE_REALTIME
43	struct timespec ts;	134	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	135	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	136	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	137	#else
47	struct timeval tv;	138	struct timeval tv;
…		…
51	}	142	}
52		143
53	static ev_tstamp	144	static ev_tstamp
54	get_clock (void)	145	get_clock (void)
55	{	146	{
56	#if HAVE_MONOTONIC	147	#if EV_USE_MONOTONIC
57	if (have_monotonic)	148	if (expect_true (have_monotonic))
58	{	149	{
59	struct timespec ts;	150	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	151	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	152	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	153	}
63	#endif	154	#endif
64		155
65	return ev_time ();	156	return ev_time ();
66	}	157	}
67		158
		159	#define array_roundsize(base,n) ((n) | 4 & ~3)
		160
68	#define array_needsize(base,cur,cnt,init) \	161	#define array_needsize(base,cur,cnt,init) \
69	if ((cnt) > cur) \	162	if (expect_false ((cnt) > cur)) \
70	{ \	163	{ \
71	int newcnt = cur ? cur << 1 : 16; \	164	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	165	do \
		166	{ \
		167	newcnt = array_roundsize (base, newcnt << 1); \
		168	} \
		169	while ((cnt) > newcnt); \
		170	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	171	base = realloc (base, sizeof (*base) * (newcnt)); \
74	init (base + cur, newcnt - cur); \	172	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	173	cur = newcnt; \
76	}	174	}
77		175
		176	/*****************************************************************************/
		177
78	typedef struct	178	typedef struct
79	{	179	{
80	struct ev_io *head;	180	struct ev_io *head;
81	unsigned char wev, rev; /* want, received event set */	181	unsigned char events;
		182	unsigned char reify;
82	} ANFD;	183	} ANFD;
83		184
84	static ANFD *anfds;	185	static ANFD *anfds;
85	static int anfdmax;	186	static int anfdmax;
86		187
		188	static void
		189	anfds_init (ANFD *base, int count)
		190	{
		191	while (count--)
		192	{
		193	base->head = 0;
		194	base->events = EV_NONE;
		195	base->reify = 0;
		196
		197	++base;
		198	}
		199	}
		200
		201	typedef struct
		202	{
		203	W w;
		204	int events;
		205	} ANPENDING;
		206
		207	static ANPENDING *pendings [NUMPRI];
		208	static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
		209
		210	static void
		211	event (W w, int events)
		212	{
		213	if (w->pending)
		214	{
		215	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		216	return;
		217	}
		218
		219	w->pending = ++pendingcnt [ABSPRI (w)];
		220	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
		221	pendings [ABSPRI (w)][w->pending - 1].w = w;
		222	pendings [ABSPRI (w)][w->pending - 1].events = events;
		223	}
		224
		225	static void
		226	queue_events (W *events, int eventcnt, int type)
		227	{
		228	int i;
		229
		230	for (i = 0; i < eventcnt; ++i)
		231	event (events [i], type);
		232	}
		233
		234	static void
		235	fd_event (int fd, int events)
		236	{
		237	ANFD *anfd = anfds + fd;
		238	struct ev_io *w;
		239
		240	for (w = anfd->head; w; w = w->next)
		241	{
		242	int ev = w->events & events;
		243
		244	if (ev)
		245	event ((W)w, ev);
		246	}
		247	}
		248
		249	/*****************************************************************************/
		250
87	static int *fdchanges;	251	static int *fdchanges;
88	static int fdchangemax, fdchangecnt;	252	static int fdchangemax, fdchangecnt;
89		253
90	static void	254	static void
91	anfds_init (ANFD *base, int count)	255	fd_reify (void)
92	{	256	{
93	while (count--)	257	int i;
94	{	258
95	base->head = 0;	259	for (i = 0; i < fdchangecnt; ++i)
96	base->wev = base->rev = EV_NONE;
97	++base;
98	}	260	{
99	}	261	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;	262	ANFD *anfd = anfds + fd;
		263	struct ev_io *w;
		264
		265	int events = 0;
		266
		267	for (w = anfd->head; w; w = w->next)
		268	events |= w->events;
		269
		270	anfd->reify = 0;
		271
		272	if (anfd->events != events)
		273	{
		274	method_modify (fd, anfd->events, events);
		275	anfd->events = events;
		276	}
		277	}
		278
		279	fdchangecnt = 0;
		280	}
		281
		282	static void
		283	fd_change (int fd)
		284	{
		285	if (anfds [fd].reify || fdchangecnt < 0)
		286	return;
		287
		288	anfds [fd].reify = 1;
		289
		290	++fdchangecnt;
		291	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		292	fdchanges [fdchangecnt - 1] = fd;
		293	}
		294
		295	static void
		296	fd_kill (int fd)
		297	{
123	struct ev_io *w;	298	struct ev_io *w;
124		299
125	for (w = anfd->head; w; w = w->next)	300	printf ("killing fd %d\n", fd);//D
		301	while ((w = anfds [fd].head))
		302	{
		303	ev_io_stop (w);
		304	event ((W)w, EV_ERROR | EV_READ | EV_WRITE);
		305	}
		306	}
		307
		308	/* called on EBADF to verify fds */
		309	static void
		310	fd_ebadf (void)
		311	{
		312	int fd;
		313
		314	for (fd = 0; fd < anfdmax; ++fd)
		315	if (anfds [fd].events)
		316	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		317	fd_kill (fd);
		318	}
		319
		320	/* called on ENOMEM in select/poll to kill some fds and retry */
		321	static void
		322	fd_enomem (void)
		323	{
		324	int fd = anfdmax;
		325
		326	while (fd--)
		327	if (anfds [fd].events)
126	{	328	{
127	int ev = w->events & events;	329	close (fd);
128		330	fd_kill (fd);
129	if (ev)	331	return;
130	event ((struct ev_watcher *)w, ev);
131	}	332	}
132	}	333	}
		334
		335	/*****************************************************************************/
133		336
134	static struct ev_timer **timers;	337	static struct ev_timer **timers;
135	static int timermax, timercnt;	338	static int timermax, timercnt;
136		339
		340	static struct ev_periodic **periodics;
		341	static int periodicmax, periodiccnt;
		342
137	static void	343	static void
138	upheap (int k)	344	upheap (WT *timers, int k)
139	{	345	{
140	struct ev_timer *w = timers [k];	346	WT w = timers [k];
141		347
142	while (k && timers [k >> 1]->at > w->at)	348	while (k && timers [k >> 1]->at > w->at)
143	{	349	{
144	timers [k] = timers [k >> 1];	350	timers [k] = timers [k >> 1];
145	timers [k]->active = k + 1;	351	timers [k]->active = k + 1;
…		…
150	timers [k]->active = k + 1;	356	timers [k]->active = k + 1;
151		357
152	}	358	}
153		359
154	static void	360	static void
155	downheap (int k)	361	downheap (WT *timers, int N, int k)
156	{	362	{
157	struct ev_timer *w = timers [k];	363	WT w = timers [k];
158		364
159	while (k < (timercnt >> 1))	365	while (k < (N >> 1))
160	{	366	{
161	int j = k << 1;	367	int j = k << 1;
162		368
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	369	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
164	++j;	370	++j;
165		371
166	if (w->at <= timers [j]->at)	372	if (w->at <= timers [j]->at)
167	break;	373	break;
168		374
…		…
173		379
174	timers [k] = w;	380	timers [k] = w;
175	timers [k]->active = k + 1;	381	timers [k]->active = k + 1;
176	}	382	}
177		383
178	static struct ev_signal **signals;	384	/*****************************************************************************/
		385
		386	typedef struct
		387	{
		388	struct ev_signal *head;
		389	sig_atomic_t volatile gotsig;
		390	} ANSIG;
		391
		392	static ANSIG *signals;
179	static int signalmax, signalcnt;	393	static int signalmax;
180		394
		395	static int sigpipe [2];
		396	static sig_atomic_t volatile gotsig;
		397	static struct ev_io sigev;
		398
181	static void	399	static void
182	signals_init (struct ev_signal **base, int count)	400	signals_init (ANSIG *base, int count)
183	{	401	{
184	while (count--)	402	while (count--)
185	*base++ = 0;	403	{
186	}	404	base->head = 0;
		405	base->gotsig = 0;
187		406
		407	++base;
		408	}
		409	}
		410
		411	static void
		412	sighandler (int signum)
		413	{
		414	signals [signum - 1].gotsig = 1;
		415
		416	if (!gotsig)
		417	{
		418	gotsig = 1;
		419	write (sigpipe [1], &signum, 1);
		420	}
		421	}
		422
		423	static void
		424	sigcb (struct ev_io *iow, int revents)
		425	{
		426	struct ev_signal *w;
		427	int signum;
		428
		429	read (sigpipe [0], &revents, 1);
		430	gotsig = 0;
		431
		432	for (signum = signalmax; signum--; )
		433	if (signals [signum].gotsig)
		434	{
		435	signals [signum].gotsig = 0;
		436
		437	for (w = signals [signum].head; w; w = w->next)
		438	event ((W)w, EV_SIGNAL);
		439	}
		440	}
		441
		442	static void
		443	siginit (void)
		444	{
		445	#ifndef WIN32
		446	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		447	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		448
		449	/* rather than sort out wether we really need nb, set it */
		450	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		451	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		452	#endif
		453
		454	ev_io_set (&sigev, sigpipe [0], EV_READ);
		455	ev_io_start (&sigev);
		456	}
		457
		458	/*****************************************************************************/
		459
		460	static struct ev_idle **idles;
		461	static int idlemax, idlecnt;
		462
		463	static struct ev_prepare **prepares;
		464	static int preparemax, preparecnt;
		465
		466	static struct ev_check **checks;
		467	static int checkmax, checkcnt;
		468
		469	/*****************************************************************************/
		470
		471	static struct ev_child *childs [PID_HASHSIZE];
		472	static struct ev_signal childev;
		473
		474	#ifndef WIN32
		475
		476	#ifndef WCONTINUED
		477	# define WCONTINUED 0
		478	#endif
		479
		480	static void
		481	childcb (struct ev_signal *sw, int revents)
		482	{
		483	struct ev_child *w;
		484	int pid, status;
		485
		486	while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)
		487	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
		488	if (w->pid == pid || !w->pid)
		489	{
		490	w->status = status;
		491	event ((W)w, EV_CHILD);
		492	}
		493	}
		494
		495	#endif
		496
		497	/*****************************************************************************/
		498
		499	#if EV_USE_KQUEUE
		500	# include "ev_kqueue.c"
		501	#endif
188	#if HAVE_EPOLL	502	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	503	# include "ev_epoll.c"
190	#endif	504	#endif
		505	#if EV_USE_POLL
		506	# include "ev_poll.c"
		507	#endif
191	#if HAVE_SELECT	508	#if EV_USE_SELECT
192	# include "ev_select.c"	509	# include "ev_select.c"
193	#endif	510	#endif
194		511
		512	int
		513	ev_version_major (void)
		514	{
		515	return EV_VERSION_MAJOR;
		516	}
		517
		518	int
		519	ev_version_minor (void)
		520	{
		521	return EV_VERSION_MINOR;
		522	}
		523
		524	/* return true if we are running with elevated privileges and ignore env variables */
		525	static int
		526	enable_secure ()
		527	{
		528	return getuid () != geteuid ()
		529	|| getgid () != getegid ();
		530	}
		531
195	int ev_init (int flags)	532	int ev_init (int methods)
196	{	533	{
		534	if (!ev_method)
		535	{
197	#if HAVE_MONOTONIC	536	#if EV_USE_MONOTONIC
198	{	537	{
199	struct timespec ts;	538	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	539	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	540	have_monotonic = 1;
202	}	541	}
203	#endif	542	#endif
204		543
205	ev_now = ev_time ();	544	ev_now = ev_time ();
		545	now = get_clock ();
		546	now_floor = now;
		547	diff = ev_now - now;
206		548
		549	if (pipe (sigpipe))
		550	return 0;
		551
		552	if (methods == EVMETHOD_AUTO)
		553	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		554	methods = atoi (getenv ("LIBEV_METHODS"));
		555	else
		556	methods = EVMETHOD_ANY;
		557
		558	ev_method = 0;
		559	#if EV_USE_KQUEUE
		560	if (!ev_method && (methods & EVMETHOD_KQUEUE)) kqueue_init (methods);
		561	#endif
207	#if HAVE_EPOLL	562	#if EV_USE_EPOLL
208	if (epoll_init (flags))	563	if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods);
209	return ev_method;
210	#endif	564	#endif
		565	#if EV_USE_POLL
		566	if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
		567	#endif
211	#if HAVE_SELECT	568	#if EV_USE_SELECT
212	if (select_init (flags))	569	if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
213	return ev_method;
214	#endif	570	#endif
215		571
216	ev_method = EVMETHOD_NONE;	572	if (ev_method)
		573	{
		574	ev_watcher_init (&sigev, sigcb);
		575	siginit ();
		576
		577	#ifndef WIN32
		578	ev_signal_init (&childev, childcb, SIGCHLD);
		579	ev_signal_start (&childev);
		580	#endif
		581	}
		582	}
		583
217	return ev_method;	584	return ev_method;
218	}	585	}
219		586
220	void ev_prefork (void)	587	/*****************************************************************************/
221	{
222	}
223		588
		589	void
		590	ev_fork_prepare (void)
		591	{
		592	/* nop */
		593	}
		594
		595	void
224	void ev_postfork_parent (void)	596	ev_fork_parent (void)
225	{	597	{
		598	/* nop */
226	}	599	}
227		600
		601	void
228	void ev_postfork_child (void)	602	ev_fork_child (void)
229	{	603	{
230	#if HAVE_EPOLL	604	#if EV_USE_EPOLL
		605	if (ev_method == EVMETHOD_EPOLL)
231	epoll_postfork_child ();	606	epoll_postfork_child ();
232	#endif	607	#endif
233	}
234		608
		609	ev_io_stop (&sigev);
		610	close (sigpipe [0]);
		611	close (sigpipe [1]);
		612	pipe (sigpipe);
		613	siginit ();
		614	}
		615
		616	/*****************************************************************************/
		617
235	static void	618	static void
236	call_pending ()	619	call_pending (void)
		620	{
		621	int pri;
		622
		623	for (pri = NUMPRI; pri--; )
		624	while (pendingcnt [pri])
		625	{
		626	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		627
		628	if (p->w)
		629	{
		630	p->w->pending = 0;
		631	p->w->cb (p->w, p->events);
		632	}
		633	}
		634	}
		635
		636	static void
		637	timers_reify (void)
		638	{
		639	while (timercnt && timers [0]->at <= now)
		640	{
		641	struct ev_timer *w = timers [0];
		642
		643	/* first reschedule or stop timer */
		644	if (w->repeat)
		645	{
		646	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
		647	w->at = now + w->repeat;
		648	downheap ((WT *)timers, timercnt, 0);
		649	}
		650	else
		651	ev_timer_stop (w); /* nonrepeating: stop timer */
		652
		653	event ((W)w, EV_TIMEOUT);
		654	}
		655	}
		656
		657	static void
		658	periodics_reify (void)
		659	{
		660	while (periodiccnt && periodics [0]->at <= ev_now)
		661	{
		662	struct ev_periodic *w = periodics [0];
		663
		664	/* first reschedule or stop timer */
		665	if (w->interval)
		666	{
		667	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
		668	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
		669	downheap ((WT *)periodics, periodiccnt, 0);
		670	}
		671	else
		672	ev_periodic_stop (w); /* nonrepeating: stop timer */
		673
		674	event ((W)w, EV_PERIODIC);
		675	}
		676	}
		677
		678	static void
		679	periodics_reschedule (ev_tstamp diff)
237	{	680	{
238	int i;	681	int i;
239		682
		683	/* adjust periodics after time jump */
240	for (i = 0; i < pendingcnt; ++i)	684	for (i = 0; i < periodiccnt; ++i)
241	{	685	{
242	ANPENDING *p = pendings + i;	686	struct ev_periodic *w = periodics [i];
243		687
244	if (p->w)	688	if (w->interval)
245	{
246	p->w->pending = 0;
247	p->w->cb (p->w, p->events);
248	}	689	{
249	}	690	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
250		691
251	pendingcnt = 0;	692	if (fabs (diff) >= 1e-4)
252	}	693	{
		694	ev_periodic_stop (w);
		695	ev_periodic_start (w);
253		696
254	static void	697	i = 0; /* restart loop, inefficient, but time jumps should be rare */
255	timer_reify (void)	698	}
256	{
257	while (timercnt && timers [0]->at <= ev_now)
258	{
259	struct ev_timer *w = timers [0];
260
261	/* first reschedule timer */
262	if (w->repeat)
263	{	699	}
264	if (w->is_abs)	700	}
265	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	701	}
266	else
267	w->at = ev_now + w->repeat;
268		702
269	downheap (0);	703	static int
		704	time_update_monotonic (void)
		705	{
		706	now = get_clock ();
		707
		708	if (expect_true (now - now_floor < MIN_TIMEJUMP * .5))
		709	{
		710	ev_now = now + diff;
		711	return 0;
		712	}
		713	else
		714	{
		715	now_floor = now;
		716	ev_now = ev_time ();
		717	return 1;
		718	}
		719	}
		720
		721	static void
		722	time_update (void)
		723	{
		724	int i;
		725
		726	#if EV_USE_MONOTONIC
		727	if (expect_true (have_monotonic))
		728	{
		729	if (time_update_monotonic ())
270	}	730	{
		731	ev_tstamp odiff = diff;
		732
		733	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		734	{
		735	diff = ev_now - now;
		736
		737	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		738	return; /* all is well */
		739
		740	ev_now = ev_time ();
		741	now = get_clock ();
		742	now_floor = now;
		743	}
		744
		745	periodics_reschedule (diff - odiff);
		746	/* no timer adjustment, as the monotonic clock doesn't jump */
		747	}
		748	}
		749	else
		750	#endif
		751	{
		752	ev_now = ev_time ();
		753
		754	if (expect_false (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		755	{
		756	periodics_reschedule (ev_now - now);
		757
		758	/* adjust timers. this is easy, as the offset is the same for all */
		759	for (i = 0; i < timercnt; ++i)
		760	timers [i]->at += diff;
		761	}
		762
		763	now = ev_now;
		764	}
		765	}
		766
		767	int ev_loop_done;
		768
		769	void ev_loop (int flags)
		770	{
		771	double block;
		772	ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
		773
		774	do
		775	{
		776	/* queue check watchers (and execute them) */
		777	if (expect_false (preparecnt))
		778	{
		779	queue_events ((W *)prepares, preparecnt, EV_PREPARE);
		780	call_pending ();
		781	}
		782
		783	/* update fd-related kernel structures */
		784	fd_reify ();
		785
		786	/* calculate blocking time */
		787
		788	/* we only need this for !monotonic clockor timers, but as we basically
		789	always have timers, we just calculate it always */
		790	#if EV_USE_MONOTONIC
		791	if (expect_true (have_monotonic))
		792	time_update_monotonic ();
271	else	793	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	794	#endif
273		795	{
274	event ((struct ev_watcher *)w, EV_TIMEOUT);
275	}
276	}
277
278	int ev_loop_done;
279
280	int ev_loop (int flags)
281	{
282	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;
284
285	do
286	{
287	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;
289
290	/* calculate blocking time */
291	ev_now = ev_time ();	796	ev_now = ev_time ();
		797	now = ev_now;
		798	}
292		799
293	if (flags & EVLOOP_NONBLOCK)	800	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	801	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	802	else
298	{	803	{
		804	block = MAX_BLOCKTIME;
		805
		806	if (timercnt)
		807	{
299	block = timers [0]->at - ev_now + method_fudge;	808	ev_tstamp to = timers [0]->at - now + method_fudge;
		809	if (block > to) block = to;
		810	}
		811
		812	if (periodiccnt)
		813	{
		814	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
		815	if (block > to) block = to;
		816	}
		817
300	if (block < 0.) block = 0.;	818	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	819	}
303		820
304	method_poll (block);	821	method_poll (block);
305		822
		823	/* update ev_now, do magic */
		824	time_update ();
		825
306	/* put pending timers into pendign queue and reschedule them */	826	/* queue pending timers and reschedule them */
307	timer_reify ();	827	timers_reify (); /* relative timers called last */
		828	periodics_reify (); /* absolute timers called first */
308		829
309	ev_now = ev_time ();	830	/* queue idle watchers unless io or timers are pending */
		831	if (!pendingcnt)
		832	queue_events ((W *)idles, idlecnt, EV_IDLE);
		833
		834	/* queue check watchers, to be executed first */
		835	if (checkcnt)
		836	queue_events ((W *)checks, checkcnt, EV_CHECK);
		837
310	call_pending ();	838	call_pending ();
311	}	839	}
312	while (!ev_loop_done);	840	while (!ev_loop_done);
313	}
314		841
		842	if (ev_loop_done != 2)
		843	ev_loop_done = 0;
		844	}
		845
		846	/*****************************************************************************/
		847
315	static void	848	static void
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	849	wlist_add (WL *head, WL elem)
317	{	850	{
318	elem->next = *head;	851	elem->next = *head;
319	*head = elem;	852	*head = elem;
320	}	853	}
321		854
322	static void	855	static void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	856	wlist_del (WL *head, WL elem)
324	{	857	{
325	while (*head)	858	while (*head)
326	{	859	{
327	if (*head == elem)	860	if (*head == elem)
328	{	861	{
…		…
333	head = &(*head)->next;	866	head = &(*head)->next;
334	}	867	}
335	}	868	}
336		869
337	static void	870	static void
338	ev_start (struct ev_watcher *w, int active)	871	ev_clear_pending (W w)
339	{	872	{
		873	if (w->pending)
		874	{
		875	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	876	w->pending = 0;
		877	}
		878	}
		879
		880	static void
		881	ev_start (W w, int active)
		882	{
		883	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		884	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		885
341	w->active = active;	886	w->active = active;
342	}	887	}
343		888
344	static void	889	static void
345	ev_stop (struct ev_watcher *w)	890	ev_stop (W w)
346	{	891	{
347	if (w->pending)
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	892	w->active = 0;
351	/* nop */
352	}	893	}
353		894
		895	/*****************************************************************************/
		896
354	void	897	void
355	evio_start (struct ev_io *w)	898	ev_io_start (struct ev_io *w)
356	{	899	{
		900	int fd = w->fd;
		901
357	if (ev_is_active (w))	902	if (ev_is_active (w))
358	return;	903	return;
359		904
360	int fd = w->fd;	905	assert (("ev_io_start called with negative fd", fd >= 0));
361		906
362	ev_start ((struct ev_watcher *)w, 1);	907	ev_start ((W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	908	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	909	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		910
366	++fdchangecnt;	911	fd_change (fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	912	}
370		913
371	void	914	void
372	evio_stop (struct ev_io *w)	915	ev_io_stop (struct ev_io *w)
373	{	916	{
		917	ev_clear_pending ((W)w);
374	if (!ev_is_active (w))	918	if (!ev_is_active (w))
375	return;	919	return;
376		920
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	921	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	922	ev_stop ((W)w);
379		923
380	++fdchangecnt;	924	fd_change (w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	925	}
384		926
385	void	927	void
386	evtimer_start (struct ev_timer *w)	928	ev_timer_start (struct ev_timer *w)
387	{	929	{
388	if (ev_is_active (w))	930	if (ev_is_active (w))
389	return;	931	return;
390		932
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;	933	w->at += now;
399		934
400	ev_start ((struct ev_watcher *)w, ++timercnt);	935	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		936
		937	ev_start ((W)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );	938	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;	939	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);	940	upheap ((WT *)timers, timercnt - 1);
404	}	941	}
405		942
406	void	943	void
407	evtimer_stop (struct ev_timer *w)	944	ev_timer_stop (struct ev_timer *w)
408	{	945	{
		946	ev_clear_pending ((W)w);
409	if (!ev_is_active (w))	947	if (!ev_is_active (w))
410	return;	948	return;
411		949
412	if (w->active < timercnt--)	950	if (w->active < timercnt--)
413	{	951	{
414	timers [w->active - 1] = timers [timercnt];	952	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);	953	downheap ((WT *)timers, timercnt, w->active - 1);
416	}	954	}
417		955
418	ev_stop ((struct ev_watcher *)w);	956	w->at = w->repeat;
419	}
420		957
		958	ev_stop ((W)w);
		959	}
		960
421	void	961	void
422	evsignal_start (struct ev_signal *w)	962	ev_timer_again (struct ev_timer *w)
423	{	963	{
424	if (ev_is_active (w))	964	if (ev_is_active (w))
425	return;	965	{
		966	if (w->repeat)
		967	{
		968	w->at = now + w->repeat;
		969	downheap ((WT *)timers, timercnt, w->active - 1);
		970	}
		971	else
		972	ev_timer_stop (w);
		973	}
		974	else if (w->repeat)
		975	ev_timer_start (w);
		976	}
426		977
427	ev_start ((struct ev_watcher *)w, 1);	978	void
		979	ev_periodic_start (struct ev_periodic *w)
		980	{
		981	if (ev_is_active (w))
		982	return;
		983
		984	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		985
		986	/* this formula differs from the one in periodic_reify because we do not always round up */
		987	if (w->interval)
		988	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
		989
		990	ev_start ((W)w, ++periodiccnt);
		991	array_needsize (periodics, periodicmax, periodiccnt, );
		992	periodics [periodiccnt - 1] = w;
		993	upheap ((WT *)periodics, periodiccnt - 1);
		994	}
		995
		996	void
		997	ev_periodic_stop (struct ev_periodic *w)
		998	{
		999	ev_clear_pending ((W)w);
		1000	if (!ev_is_active (w))
		1001	return;
		1002
		1003	if (w->active < periodiccnt--)
		1004	{
		1005	periodics [w->active - 1] = periodics [periodiccnt];
		1006	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		1007	}
		1008
		1009	ev_stop ((W)w);
		1010	}
		1011
		1012	void
		1013	ev_signal_start (struct ev_signal *w)
		1014	{
		1015	if (ev_is_active (w))
		1016	return;
		1017
		1018	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1019
		1020	ev_start ((W)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);	1021	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1022	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
430	}
431		1023
		1024	if (!w->next)
		1025	{
		1026	struct sigaction sa;
		1027	sa.sa_handler = sighandler;
		1028	sigfillset (&sa.sa_mask);
		1029	sa.sa_flags = 0;
		1030	sigaction (w->signum, &sa, 0);
		1031	}
		1032	}
		1033
432	void	1034	void
433	evsignal_stop (struct ev_signal *w)	1035	ev_signal_stop (struct ev_signal *w)
434	{	1036	{
		1037	ev_clear_pending ((W)w);
435	if (!ev_is_active (w))	1038	if (!ev_is_active (w))
436	return;	1039	return;
437		1040
438	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1041	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1042	ev_stop ((W)w);
		1043
		1044	if (!signals [w->signum - 1].head)
		1045	signal (w->signum, SIG_DFL);
		1046	}
		1047
		1048	void
		1049	ev_idle_start (struct ev_idle *w)
		1050	{
		1051	if (ev_is_active (w))
		1052	return;
		1053
		1054	ev_start ((W)w, ++idlecnt);
		1055	array_needsize (idles, idlemax, idlecnt, );
		1056	idles [idlecnt - 1] = w;
		1057	}
		1058
		1059	void
		1060	ev_idle_stop (struct ev_idle *w)
		1061	{
		1062	ev_clear_pending ((W)w);
		1063	if (ev_is_active (w))
		1064	return;
		1065
		1066	idles [w->active - 1] = idles [--idlecnt];
		1067	ev_stop ((W)w);
		1068	}
		1069
		1070	void
		1071	ev_prepare_start (struct ev_prepare *w)
		1072	{
		1073	if (ev_is_active (w))
		1074	return;
		1075
		1076	ev_start ((W)w, ++preparecnt);
		1077	array_needsize (prepares, preparemax, preparecnt, );
		1078	prepares [preparecnt - 1] = w;
		1079	}
		1080
		1081	void
		1082	ev_prepare_stop (struct ev_prepare *w)
		1083	{
		1084	ev_clear_pending ((W)w);
		1085	if (ev_is_active (w))
		1086	return;
		1087
		1088	prepares [w->active - 1] = prepares [--preparecnt];
		1089	ev_stop ((W)w);
		1090	}
		1091
		1092	void
		1093	ev_check_start (struct ev_check *w)
		1094	{
		1095	if (ev_is_active (w))
		1096	return;
		1097
		1098	ev_start ((W)w, ++checkcnt);
		1099	array_needsize (checks, checkmax, checkcnt, );
		1100	checks [checkcnt - 1] = w;
		1101	}
		1102
		1103	void
439	ev_stop ((struct ev_watcher *)w);	1104	ev_check_stop (struct ev_check *w)
440	}	1105	{
		1106	ev_clear_pending ((W)w);
		1107	if (ev_is_active (w))
		1108	return;
441		1109
		1110	checks [w->active - 1] = checks [--checkcnt];
		1111	ev_stop ((W)w);
		1112	}
		1113
		1114	void
		1115	ev_child_start (struct ev_child *w)
		1116	{
		1117	if (ev_is_active (w))
		1118	return;
		1119
		1120	ev_start ((W)w, 1);
		1121	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1122	}
		1123
		1124	void
		1125	ev_child_stop (struct ev_child *w)
		1126	{
		1127	ev_clear_pending ((W)w);
		1128	if (ev_is_active (w))
		1129	return;
		1130
		1131	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1132	ev_stop ((W)w);
		1133	}
		1134
442	/*****************************************************************************/	1135	/*****************************************************************************/
		1136
		1137	struct ev_once
		1138	{
		1139	struct ev_io io;
		1140	struct ev_timer to;
		1141	void (*cb)(int revents, void *arg);
		1142	void *arg;
		1143	};
		1144
		1145	static void
		1146	once_cb (struct ev_once *once, int revents)
		1147	{
		1148	void (*cb)(int revents, void *arg) = once->cb;
		1149	void *arg = once->arg;
		1150
		1151	ev_io_stop (&once->io);
		1152	ev_timer_stop (&once->to);
		1153	free (once);
		1154
		1155	cb (revents, arg);
		1156	}
		1157
		1158	static void
		1159	once_cb_io (struct ev_io *w, int revents)
		1160	{
		1161	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1162	}
		1163
		1164	static void
		1165	once_cb_to (struct ev_timer *w, int revents)
		1166	{
		1167	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1168	}
		1169
		1170	void
		1171	ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1172	{
		1173	struct ev_once *once = malloc (sizeof (struct ev_once));
		1174
		1175	if (!once)
		1176	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1177	else
		1178	{
		1179	once->cb = cb;
		1180	once->arg = arg;
		1181
		1182	ev_watcher_init (&once->io, once_cb_io);
		1183	if (fd >= 0)
		1184	{
		1185	ev_io_set (&once->io, fd, events);
		1186	ev_io_start (&once->io);
		1187	}
		1188
		1189	ev_watcher_init (&once->to, once_cb_to);
		1190	if (timeout >= 0.)
		1191	{
		1192	ev_timer_set (&once->to, timeout, 0.);
		1193	ev_timer_start (&once->to);
		1194	}
		1195	}
		1196	}
		1197
		1198	/*****************************************************************************/
		1199
443	#if 1	1200	#if 0
		1201
		1202	struct ev_io wio;
444		1203
445	static void	1204	static void
446	sin_cb (struct ev_io *w, int revents)	1205	sin_cb (struct ev_io *w, int revents)
447	{	1206	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1207	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}	1208	}
450		1209
451	static void	1210	static void
452	ocb (struct ev_timer *w, int revents)	1211	ocb (struct ev_timer *w, int revents)
453	{	1212	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1213	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
		1214	ev_timer_stop (w);
		1215	ev_timer_start (w);
		1216	}
		1217
		1218	static void
		1219	scb (struct ev_signal *w, int revents)
		1220	{
		1221	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1222	ev_io_stop (&wio);
		1223	ev_io_start (&wio);
		1224	}
		1225
		1226	static void
		1227	gcb (struct ev_signal *w, int revents)
		1228	{
		1229	fprintf (stderr, "generic %x\n", revents);
		1230
455	}	1231	}
456		1232
457	int main (void)	1233	int main (void)
458	{	1234	{
459	struct ev_io sin;
460
461	ev_init (0);	1235	ev_init (0);
462		1236
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);	1237	ev_io_init (&wio, sin_cb, 0, EV_READ);
465	evio_start (&sin);	1238	ev_io_start (&wio);
466		1239
467	struct ev_timer t[1000];	1240	struct ev_timer t[10000];
468		1241
		1242	#if 0
469	int i;	1243	int i;
470	for (i = 0; i < 1000; ++i)	1244	for (i = 0; i < 10000; ++i)
471	{	1245	{
472	struct ev_timer *w = t + i;	1246	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);	1247	ev_watcher_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);	1248	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
475	evtimer_start (w);	1249	ev_timer_start (w);
476	if (drand48 () < 0.5)	1250	if (drand48 () < 0.5)
477	evtimer_stop (w);	1251	ev_timer_stop (w);
478	}	1252	}
		1253	#endif
		1254
		1255	struct ev_timer t1;
		1256	ev_timer_init (&t1, ocb, 5, 10);
		1257	ev_timer_start (&t1);
		1258
		1259	struct ev_signal sig;
		1260	ev_signal_init (&sig, scb, SIGQUIT);
		1261	ev_signal_start (&sig);
		1262
		1263	struct ev_check cw;
		1264	ev_check_init (&cw, gcb);
		1265	ev_check_start (&cw);
		1266
		1267	struct ev_idle iw;
		1268	ev_idle_init (&iw, gcb);
		1269	ev_idle_start (&iw);
479		1270
480	ev_loop (0);	1271	ev_loop (0);
481		1272
482	return 0;	1273	return 0;
483	}	1274	}

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