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Comparing libev/ev.c (file contents):
Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.57 by root, Sun Nov 4 16:43:53 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	#ifndef EV_STANDALONE
		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
6	#include <assert.h>	44	#include <assert.h>
7	#include <errno.h>	45	#include <errno.h>
		46	#include <sys/types.h>
		47	#ifndef WIN32
		48	# include <sys/wait.h>
		49	#endif
8	#include <sys/time.h>	50	#include <sys/time.h>
9	#include <time.h>	51	#include <time.h>
10		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_USEV_POLL
		64	# define EV_USEV_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
11	#ifdef CLOCK_MONOTONIC	81	#ifndef CLOCK_MONOTONIC
		82	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	83	# define EV_USE_MONOTONIC 0
13	#endif	84	#endif
14		85
15	#define HAVE_EPOLL 1	86	#ifndef CLOCK_REALTIME
		87	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	88	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 0	89	#endif
		90
		91	/**/
18		92
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	93	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	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 */
21		97
22	#include "ev.h"	98	#include "ev.h"
23		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
24	struct ev_watcher {	114	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);	115	typedef struct ev_watcher_list *WL;
		116	typedef struct ev_watcher_time *WT;
		117
		118	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		119
		120	/*****************************************************************************/
		121
		122	typedef struct
		123	{
		124	struct ev_watcher_list *head;
		125	unsigned char events;
		126	unsigned char reify;
		127	} ANFD;
		128
		129	typedef struct
		130	{
		131	W w;
		132	int events;
		133	} ANPENDING;
		134
		135	#if EV_MULTIPLICITY
		136
		137	struct ev_loop
		138	{
		139	# define VAR(name,decl) decl;
		140	# include "ev_vars.h"
26	};	141	};
		142	# undef VAR
		143	# include "ev_wrap.h"
27		144
28	struct ev_watcher_list {	145	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		146
32	static ev_tstamp now, diff; /* monotonic clock */	147	# define VAR(name,decl) static decl;
33	ev_tstamp ev_now;	148	# include "ev_vars.h"
34	int ev_method;	149	# undef VAR
35		150
36	static int have_monotonic; /* runtime */	151	#endif
37		152
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	153	/*****************************************************************************/
39	static void (*method_reify)(void);
40	static void (*method_poll)(ev_tstamp timeout);
41		154
42	ev_tstamp	155	inline ev_tstamp
43	ev_time (void)	156	ev_time (void)
44	{	157	{
45	#if HAVE_REALTIME	158	#if EV_USE_REALTIME
46	struct timespec ts;	159	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	160	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	161	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	162	#else
50	struct timeval tv;	163	struct timeval tv;
51	gettimeofday (&tv, 0);	164	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	165	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	166	#endif
54	}	167	}
55		168
56	static ev_tstamp	169	inline ev_tstamp
57	get_clock (void)	170	get_clock (void)
58	{	171	{
59	#if HAVE_MONOTONIC	172	#if EV_USE_MONOTONIC
60	if (have_monotonic)	173	if (expect_true (have_monotonic))
61	{	174	{
62	struct timespec ts;	175	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	176	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	177	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	178	}
66	#endif	179	#endif
67		180
68	return ev_time ();	181	return ev_time ();
69	}	182	}
70		183
		184	ev_tstamp
		185	ev_now (EV_P)
		186	{
		187	return rt_now;
		188	}
		189
		190	#define array_roundsize(base,n) ((n) | 4 & ~3)
		191
71	#define array_needsize(base,cur,cnt,init) \	192	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	193	if (expect_false ((cnt) > cur)) \
73	{ \	194	{ \
74	int newcnt = cur ? cur << 1 : 16; \	195	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	196	do \
		197	{ \
		198	newcnt = array_roundsize (base, newcnt << 1); \
		199	} \
		200	while ((cnt) > newcnt); \
		201	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	202	base = realloc (base, sizeof (*base) * (newcnt)); \
77	init (base + cur, newcnt - cur); \	203	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	204	cur = newcnt; \
79	}	205	}
80		206
81	typedef struct	207	/*****************************************************************************/
82	{
83	struct ev_io *head;
84	unsigned char wev, rev; /* want, received event set */
85	} ANFD;
86
87	static ANFD *anfds;
88	static int anfdmax;
89
90	static int *fdchanges;
91	static int fdchangemax, fdchangecnt;
92		208
93	static void	209	static void
94	anfds_init (ANFD *base, int count)	210	anfds_init (ANFD *base, int count)
95	{	211	{
96	while (count--)	212	while (count--)
97	{	213	{
98	base->head = 0;	214	base->head = 0;
99	base->wev = base->rev = EV_NONE;	215	base->events = EV_NONE;
		216	base->reify = 0;
		217
100	++base;	218	++base;
101	}	219	}
102	}	220	}
103		221
104	typedef struct
105	{
106	struct ev_watcher *w;
107	int events;
108	} ANPENDING;
109
110	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;
112
113	static void	222	static void
114	event (struct ev_watcher *w, int events)	223	event (EV_P_ W w, int events)
115	{	224	{
		225	if (w->pending)
		226	{
		227	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		228	return;
		229	}
		230
116	w->pending = ++pendingcnt;	231	w->pending = ++pendingcnt [ABSPRI (w)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	232	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
118	pendings [pendingcnt - 1].w = w;	233	pendings [ABSPRI (w)][w->pending - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	234	pendings [ABSPRI (w)][w->pending - 1].events = events;
120	}	235	}
121		236
122	static void	237	static void
		238	queue_events (EV_P_ W *events, int eventcnt, int type)
		239	{
		240	int i;
		241
		242	for (i = 0; i < eventcnt; ++i)
		243	event (EV_A_ events [i], type);
		244	}
		245
		246	static void
123	fd_event (int fd, int events)	247	fd_event (EV_P_ int fd, int events)
124	{	248	{
125	ANFD *anfd = anfds + fd;	249	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	250	struct ev_io *w;
127		251
128	for (w = anfd->head; w; w = w->next)	252	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	253	{
130	int ev = w->events & events;	254	int ev = w->events & events;
131		255
132	if (ev)	256	if (ev)
133	event ((struct ev_watcher *)w, ev);	257	event (EV_A_ (W)w, ev);
		258	}
		259	}
		260
		261	/*****************************************************************************/
		262
		263	static void
		264	fd_reify (EV_P)
		265	{
		266	int i;
		267
		268	for (i = 0; i < fdchangecnt; ++i)
		269	{
		270	int fd = fdchanges [i];
		271	ANFD *anfd = anfds + fd;
		272	struct ev_io *w;
		273
		274	int events = 0;
		275
		276	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		277	events |= w->events;
		278
		279	anfd->reify = 0;
		280
		281	if (anfd->events != events)
		282	{
		283	method_modify (EV_A_ fd, anfd->events, events);
		284	anfd->events = events;
		285	}
		286	}
		287
		288	fdchangecnt = 0;
		289	}
		290
		291	static void
		292	fd_change (EV_P_ int fd)
		293	{
		294	if (anfds [fd].reify || fdchangecnt < 0)
		295	return;
		296
		297	anfds [fd].reify = 1;
		298
		299	++fdchangecnt;
		300	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		301	fdchanges [fdchangecnt - 1] = fd;
		302	}
		303
		304	static void
		305	fd_kill (EV_P_ int fd)
		306	{
		307	struct ev_io *w;
		308
		309	while ((w = (struct ev_io *)anfds [fd].head))
		310	{
		311	ev_io_stop (EV_A_ w);
		312	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		313	}
		314	}
		315
		316	/* called on EBADF to verify fds */
		317	static void
		318	fd_ebadf (EV_P)
		319	{
		320	int fd;
		321
		322	for (fd = 0; fd < anfdmax; ++fd)
		323	if (anfds [fd].events)
		324	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		325	fd_kill (EV_A_ fd);
		326	}
		327
		328	/* called on ENOMEM in select/poll to kill some fds and retry */
		329	static void
		330	fd_enomem (EV_P)
		331	{
		332	int fd = anfdmax;
		333
		334	while (fd--)
		335	if (anfds [fd].events)
		336	{
		337	close (fd);
		338	fd_kill (EV_A_ fd);
		339	return;
134	}	340	}
135	}	341	}
136		342
137	static struct ev_timer **atimers;	343	/* susually called after fork if method needs to re-arm all fds from scratch */
138	static int atimermax, atimercnt;
139
140	static struct ev_timer **rtimers;
141	static int rtimermax, rtimercnt;
142
143	static void	344	static void
144	upheap (struct ev_timer **timers, int k)	345	fd_rearm_all (EV_P)
145	{	346	{
146	struct ev_timer *w = timers [k];	347	int fd;
147		348
		349	/* this should be highly optimised to not do anything but set a flag */
		350	for (fd = 0; fd < anfdmax; ++fd)
		351	if (anfds [fd].events)
		352	{
		353	anfds [fd].events = 0;
		354	fd_change (fd);
		355	}
		356	}
		357
		358	/*****************************************************************************/
		359
		360	static void
		361	upheap (WT *heap, int k)
		362	{
		363	WT w = heap [k];
		364
148	while (k && timers [k >> 1]->at > w->at)	365	while (k && heap [k >> 1]->at > w->at)
149	{	366	{
150	timers [k] = timers [k >> 1];	367	heap [k] = heap [k >> 1];
151	timers [k]->active = k + 1;	368	heap [k]->active = k + 1;
152	k >>= 1;	369	k >>= 1;
153	}	370	}
154		371
155	timers [k] = w;	372	heap [k] = w;
156	timers [k]->active = k + 1;	373	heap [k]->active = k + 1;
157		374
158	}	375	}
159		376
160	static void	377	static void
161	downheap (struct ev_timer **timers, int N, int k)	378	downheap (WT *heap, int N, int k)
162	{	379	{
163	struct ev_timer *w = timers [k];	380	WT w = heap [k];
164		381
165	while (k < (N >> 1))	382	while (k < (N >> 1))
166	{	383	{
167	int j = k << 1;	384	int j = k << 1;
168		385
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	386	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
170	++j;	387	++j;
171		388
172	if (w->at <= timers [j]->at)	389	if (w->at <= heap [j]->at)
173	break;	390	break;
174		391
175	timers [k] = timers [j];	392	heap [k] = heap [j];
176	timers [k]->active = k + 1;	393	heap [k]->active = k + 1;
177	k = j;	394	k = j;
178	}	395	}
179		396
180	timers [k] = w;	397	heap [k] = w;
181	timers [k]->active = k + 1;	398	heap [k]->active = k + 1;
182	}	399	}
183		400
184	static struct ev_signal **signals;	401	/*****************************************************************************/
		402
		403	typedef struct
		404	{
		405	struct ev_watcher_list *head;
		406	sig_atomic_t volatile gotsig;
		407	} ANSIG;
		408
		409	static ANSIG *signals;
185	static int signalmax;	410	static int signalmax;
186		411
		412	static int sigpipe [2];
		413	static sig_atomic_t volatile gotsig;
		414
187	static void	415	static void
188	signals_init (struct ev_signal **base, int count)	416	signals_init (ANSIG *base, int count)
189	{	417	{
190	while (count--)	418	while (count--)
191	*base++ = 0;	419	{
192	}	420	base->head = 0;
		421	base->gotsig = 0;
193		422
		423	++base;
		424	}
		425	}
		426
		427	static void
		428	sighandler (int signum)
		429	{
		430	signals [signum - 1].gotsig = 1;
		431
		432	if (!gotsig)
		433	{
		434	int old_errno = errno;
		435	gotsig = 1;
		436	write (sigpipe [1], &signum, 1);
		437	errno = old_errno;
		438	}
		439	}
		440
		441	static void
		442	sigcb (EV_P_ struct ev_io *iow, int revents)
		443	{
		444	struct ev_watcher_list *w;
		445	int signum;
		446
		447	read (sigpipe [0], &revents, 1);
		448	gotsig = 0;
		449
		450	for (signum = signalmax; signum--; )
		451	if (signals [signum].gotsig)
		452	{
		453	signals [signum].gotsig = 0;
		454
		455	for (w = signals [signum].head; w; w = w->next)
		456	event (EV_A_ (W)w, EV_SIGNAL);
		457	}
		458	}
		459
		460	static void
		461	siginit (EV_P)
		462	{
		463	#ifndef WIN32
		464	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		465	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		466
		467	/* rather than sort out wether we really need nb, set it */
		468	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		469	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		470	#endif
		471
		472	ev_io_set (&sigev, sigpipe [0], EV_READ);
		473	ev_io_start (EV_A_ &sigev);
		474	ev_unref (EV_A); /* child watcher should not keep loop alive */
		475	}
		476
		477	/*****************************************************************************/
		478
		479	#ifndef WIN32
		480
		481	#ifndef WCONTINUED
		482	# define WCONTINUED 0
		483	#endif
		484
		485	static void
		486	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		487	{
		488	struct ev_child *w;
		489
		490	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		491	if (w->pid == pid || !w->pid)
		492	{
		493	w->priority = sw->priority; /* need to do it *now* */
		494	w->rpid = pid;
		495	w->rstatus = status;
		496	event (EV_A_ (W)w, EV_CHILD);
		497	}
		498	}
		499
		500	static void
		501	childcb (EV_P_ struct ev_signal *sw, int revents)
		502	{
		503	int pid, status;
		504
		505	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		506	{
		507	/* make sure we are called again until all childs have been reaped */
		508	event (EV_A_ (W)sw, EV_SIGNAL);
		509
		510	child_reap (EV_A_ sw, pid, pid, status);
		511	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		512	}
		513	}
		514
		515	#endif
		516
		517	/*****************************************************************************/
		518
		519	#if EV_USE_KQUEUE
		520	# include "ev_kqueue.c"
		521	#endif
194	#if HAVE_EPOLL	522	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	523	# include "ev_epoll.c"
196	#endif	524	#endif
		525	#if EV_USEV_POLL
		526	# include "ev_poll.c"
		527	#endif
197	#if HAVE_SELECT	528	#if EV_USE_SELECT
198	# include "ev_select.c"	529	# include "ev_select.c"
199	#endif	530	#endif
200		531
201	int ev_init (int flags)	532	int
		533	ev_version_major (void)
202	{	534	{
		535	return EV_VERSION_MAJOR;
		536	}
		537
		538	int
		539	ev_version_minor (void)
		540	{
		541	return EV_VERSION_MINOR;
		542	}
		543
		544	/* return true if we are running with elevated privileges and should ignore env variables */
		545	static int
		546	enable_secure (void)
		547	{
		548	#ifdef WIN32
		549	return 0;
		550	#else
		551	return getuid () != geteuid ()
		552	|| getgid () != getegid ();
		553	#endif
		554	}
		555
		556	int
		557	ev_method (EV_P)
		558	{
		559	return method;
		560	}
		561
		562	static void
		563	loop_init (EV_P_ int methods)
		564	{
		565	if (!method)
		566	{
203	#if HAVE_MONOTONIC	567	#if EV_USE_MONOTONIC
204	{	568	{
205	struct timespec ts;	569	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	570	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	571	have_monotonic = 1;
208	}	572	}
209	#endif	573	#endif
210		574
211	ev_now = ev_time ();	575	rt_now = ev_time ();
212	now = get_clock ();	576	mn_now = get_clock ();
213	diff = ev_now - now;	577	now_floor = mn_now;
		578	rtmn_diff = rt_now - mn_now;
214		579
		580	if (methods == EVMETHOD_AUTO)
		581	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		582	methods = atoi (getenv ("LIBEV_METHODS"));
		583	else
		584	methods = EVMETHOD_ANY;
		585
		586	method = 0;
		587	#if EV_USE_KQUEUE
		588	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		589	#endif
215	#if HAVE_EPOLL	590	#if EV_USE_EPOLL
216	if (epoll_init (flags))	591	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
217	return ev_method;
218	#endif	592	#endif
		593	#if EV_USEV_POLL
		594	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		595	#endif
219	#if HAVE_SELECT	596	#if EV_USE_SELECT
220	if (select_init (flags))	597	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
221	return ev_method;
222	#endif	598	#endif
223
224	ev_method = EVMETHOD_NONE;
225	return ev_method;
226	}
227
228	void ev_prefork (void)
229	{
230	}
231
232	void ev_postfork_parent (void)
233	{
234	}
235
236	void ev_postfork_child (void)
237	{
238	#if HAVE_EPOLL
239	epoll_postfork_child ();
240	#endif
241	}
242
243	static void
244	call_pending ()
245	{
246	int i;
247
248	for (i = 0; i < pendingcnt; ++i)
249	{	599	}
250	ANPENDING *p = pendings + i;	600	}
251		601
252	if (p->w)	602	void
		603	loop_destroy (EV_P)
		604	{
		605	#if EV_USE_KQUEUE
		606	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		607	#endif
		608	#if EV_USE_EPOLL
		609	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		610	#endif
		611	#if EV_USEV_POLL
		612	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		613	#endif
		614	#if EV_USE_SELECT
		615	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		616	#endif
		617
		618	method = 0;
		619	/*TODO*/
		620	}
		621
		622	void
		623	loop_fork (EV_P)
		624	{
		625	/*TODO*/
		626	#if EV_USE_EPOLL
		627	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		628	#endif
		629	#if EV_USE_KQUEUE
		630	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		631	#endif
		632	}
		633
		634	#if EV_MULTIPLICITY
		635	struct ev_loop *
		636	ev_loop_new (int methods)
		637	{
		638	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		639
		640	loop_init (EV_A_ methods);
		641
		642	if (ev_methods (EV_A))
		643	return loop;
		644
		645	return 0;
		646	}
		647
		648	void
		649	ev_loop_destroy (EV_P)
		650	{
		651	loop_destroy (EV_A);
		652	free (loop);
		653	}
		654
		655	void
		656	ev_loop_fork (EV_P)
		657	{
		658	loop_fork (EV_A);
		659	}
		660
		661	#endif
		662
		663	#if EV_MULTIPLICITY
		664	struct ev_loop default_loop_struct;
		665	static struct ev_loop *default_loop;
		666
		667	struct ev_loop *
		668	#else
		669	static int default_loop;
		670
		671	int
		672	#endif
		673	ev_default_loop (int methods)
		674	{
		675	if (sigpipe [0] == sigpipe [1])
		676	if (pipe (sigpipe))
		677	return 0;
		678
		679	if (!default_loop)
		680	{
		681	#if EV_MULTIPLICITY
		682	struct ev_loop *loop = default_loop = &default_loop_struct;
		683	#else
		684	default_loop = 1;
		685	#endif
		686
		687	loop_init (EV_A_ methods);
		688
		689	if (ev_method (EV_A))
253	{	690	{
254	p->w->pending = 0;	691	ev_watcher_init (&sigev, sigcb);
255	p->w->cb (p->w, p->events);	692	ev_set_priority (&sigev, EV_MAXPRI);
		693	siginit (EV_A);
		694
		695	#ifndef WIN32
		696	ev_signal_init (&childev, childcb, SIGCHLD);
		697	ev_set_priority (&childev, EV_MAXPRI);
		698	ev_signal_start (EV_A_ &childev);
		699	ev_unref (EV_A); /* child watcher should not keep loop alive */
		700	#endif
256	}	701	}
		702	else
		703	default_loop = 0;
		704	}
		705
		706	return default_loop;
		707	}
		708
		709	void
		710	ev_default_destroy (void)
		711	{
		712	#if EV_MULTIPLICITY
		713	struct ev_loop *loop = default_loop;
		714	#endif
		715
		716	ev_ref (EV_A); /* child watcher */
		717	ev_signal_stop (EV_A_ &childev);
		718
		719	ev_ref (EV_A); /* signal watcher */
		720	ev_io_stop (EV_A_ &sigev);
		721
		722	close (sigpipe [0]); sigpipe [0] = 0;
		723	close (sigpipe [1]); sigpipe [1] = 0;
		724
		725	loop_destroy (EV_A);
		726	}
		727
		728	void
		729	ev_default_fork (EV_P)
		730	{
		731	loop_fork (EV_A);
		732
		733	ev_io_stop (EV_A_ &sigev);
		734	close (sigpipe [0]);
		735	close (sigpipe [1]);
		736	pipe (sigpipe);
		737
		738	ev_ref (EV_A); /* signal watcher */
		739	siginit (EV_A);
		740	}
		741
		742	/*****************************************************************************/
		743
		744	static void
		745	call_pending (EV_P)
		746	{
		747	int pri;
		748
		749	for (pri = NUMPRI; pri--; )
		750	while (pendingcnt [pri])
		751	{
		752	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		753
		754	if (p->w)
		755	{
		756	p->w->pending = 0;
		757	p->w->cb (EV_A_ p->w, p->events);
		758	}
257	}	759	}
258
259	pendingcnt = 0;
260	}	760	}
261		761
262	static void	762	static void
263	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	763	timers_reify (EV_P)
264	{	764	{
265	while (timercnt && timers [0]->at <= now)	765	while (timercnt && timers [0]->at <= mn_now)
266	{	766	{
267	struct ev_timer *w = timers [0];	767	struct ev_timer *w = timers [0];
268		768
269	/* first reschedule or stop timer */	769	/* first reschedule or stop timer */
270	if (w->repeat)	770	if (w->repeat)
271	{	771	{
272	if (w->is_abs)	772	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
273	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
274	else
275	w->at = now + w->repeat;	773	w->at = mn_now + w->repeat;
276
277	assert (w->at > now);
278
279	downheap (timers, timercnt, 0);	774	downheap ((WT *)timers, timercnt, 0);
280	}	775	}
281	else	776	else
		777	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		778
		779	event (EV_A_ (W)w, EV_TIMEOUT);
		780	}
		781	}
		782
		783	static void
		784	periodics_reify (EV_P)
		785	{
		786	while (periodiccnt && periodics [0]->at <= rt_now)
		787	{
		788	struct ev_periodic *w = periodics [0];
		789
		790	/* first reschedule or stop timer */
		791	if (w->interval)
282	{	792	{
283	evtimer_stop (w); /* nonrepeating: stop timer */	793	w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
284	--timercnt; /* maybe pass by reference instead? */	794	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
		795	downheap ((WT *)periodics, periodiccnt, 0);
285	}	796	}
		797	else
		798	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
286		799
287	event ((struct ev_watcher *)w, EV_TIMEOUT);	800	event (EV_A_ (W)w, EV_PERIODIC);
288	}	801	}
289	}	802	}
290		803
291	static void	804	static void
292	time_update ()	805	periodics_reschedule (EV_P)
293	{	806	{
294	int i;	807	int i;
295	ev_now = ev_time ();
296		808
297	if (have_monotonic)	809	/* adjust periodics after time jump */
		810	for (i = 0; i < periodiccnt; ++i)
298	{	811	{
299	ev_tstamp odiff = diff;	812	struct ev_periodic *w = periodics [i];
300		813
301	/* detecting time jumps is much more difficult */	814	if (w->interval)
302	for (i = 2; --i; ) /* loop a few times, before making important decisions */
303	{	815	{
304	now = get_clock ();	816	ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
305	diff = ev_now - now;
306		817
307	if (fabs (odiff - diff) < MIN_TIMEJUMP)	818	if (fabs (diff) >= 1e-4)
308	return; /* all is well */	819	{
		820	ev_periodic_stop (EV_A_ w);
		821	ev_periodic_start (EV_A_ w);
309		822
310	ev_now = ev_time ();	823	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		824	}
311	}	825	}
		826	}
		827	}
312		828
313	/* time jump detected, reschedule atimers */	829	inline int
314	for (i = 0; i < atimercnt; ++i)	830	time_update_monotonic (EV_P)
		831	{
		832	mn_now = get_clock ();
		833
		834	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		835	{
		836	rt_now = rtmn_diff + mn_now;
		837	return 0;
		838	}
		839	else
		840	{
		841	now_floor = mn_now;
		842	rt_now = ev_time ();
		843	return 1;
		844	}
		845	}
		846
		847	static void
		848	time_update (EV_P)
		849	{
		850	int i;
		851
		852	#if EV_USE_MONOTONIC
		853	if (expect_true (have_monotonic))
		854	{
		855	if (time_update_monotonic (EV_A))
315	{	856	{
316	struct ev_timer *w = atimers [i];	857	ev_tstamp odiff = rtmn_diff;
317	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	858
		859	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		860	{
		861	rtmn_diff = rt_now - mn_now;
		862
		863	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		864	return; /* all is well */
		865
		866	rt_now = ev_time ();
		867	mn_now = get_clock ();
		868	now_floor = mn_now;
		869	}
		870
		871	periodics_reschedule (EV_A);
		872	/* no timer adjustment, as the monotonic clock doesn't jump */
		873	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
318	}	874	}
319	}	875	}
320	else	876	else
		877	#endif
321	{	878	{
322	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	879	rt_now = ev_time ();
323	/* time jump detected, adjust rtimers */	880
		881	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		882	{
		883	periodics_reschedule (EV_A);
		884
		885	/* adjust timers. this is easy, as the offset is the same for all */
324	for (i = 0; i < rtimercnt; ++i)	886	for (i = 0; i < timercnt; ++i)
325	rtimers [i]->at += ev_now - now;	887	timers [i]->at += rt_now - mn_now;
		888	}
326		889
327	now = ev_now;	890	mn_now = rt_now;
328	}	891	}
329	}	892	}
330		893
331	int ev_loop_done;	894	void
		895	ev_ref (EV_P)
		896	{
		897	++activecnt;
		898	}
332		899
		900	void
		901	ev_unref (EV_P)
		902	{
		903	--activecnt;
		904	}
		905
		906	static int loop_done;
		907
		908	void
333	void ev_loop (int flags)	909	ev_loop (EV_P_ int flags)
334	{	910	{
335	double block;	911	double block;
336	ev_loop_done = flags & EVLOOP_ONESHOT;	912	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
337		913
338	do	914	do
339	{	915	{
		916	/* queue check watchers (and execute them) */
		917	if (expect_false (preparecnt))
		918	{
		919	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		920	call_pending (EV_A);
		921	}
		922
340	/* update fd-related kernel structures */	923	/* update fd-related kernel structures */
341	method_reify (); fdchangecnt = 0;	924	fd_reify (EV_A);
342		925
343	/* calculate blocking time */	926	/* calculate blocking time */
		927
		928	/* we only need this for !monotonic clockor timers, but as we basically
		929	always have timers, we just calculate it always */
		930	#if EV_USE_MONOTONIC
		931	if (expect_true (have_monotonic))
		932	time_update_monotonic (EV_A);
		933	else
		934	#endif
		935	{
		936	rt_now = ev_time ();
		937	mn_now = rt_now;
		938	}
		939
344	if (flags & EVLOOP_NONBLOCK)	940	if (flags & EVLOOP_NONBLOCK || idlecnt)
345	block = 0.;	941	block = 0.;
346	else	942	else
347	{	943	{
348	block = MAX_BLOCKTIME;	944	block = MAX_BLOCKTIME;
349		945
350	if (rtimercnt)	946	if (timercnt)
351	{	947	{
352	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	948	ev_tstamp to = timers [0]->at - mn_now + method_fudge;
353	if (block > to) block = to;	949	if (block > to) block = to;
354	}	950	}
355		951
356	if (atimercnt)	952	if (periodiccnt)
357	{	953	{
358	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	954	ev_tstamp to = periodics [0]->at - rt_now + method_fudge;
359	if (block > to) block = to;	955	if (block > to) block = to;
360	}	956	}
361		957
362	if (block < 0.) block = 0.;	958	if (block < 0.) block = 0.;
363	}	959	}
364		960
365	method_poll (block);	961	method_poll (EV_A_ block);
366		962
367	/* update ev_now, do magic */	963	/* update rt_now, do magic */
368	time_update ();	964	time_update (EV_A);
369		965
370	/* put pending timers into pendign queue and reschedule them */	966	/* queue pending timers and reschedule them */
371	/* absolute timers first */	967	timers_reify (EV_A); /* relative timers called last */
372	timers_reify (atimers, atimercnt, ev_now);	968	periodics_reify (EV_A); /* absolute timers called first */
373	/* relative timers second */
374	timers_reify (rtimers, rtimercnt, now);
375		969
		970	/* queue idle watchers unless io or timers are pending */
		971	if (!pendingcnt)
		972	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		973
		974	/* queue check watchers, to be executed first */
		975	if (checkcnt)
		976	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		977
376	call_pending ();	978	call_pending (EV_A);
377	}	979	}
378	while (!ev_loop_done);	980	while (activecnt && !loop_done);
379	}
380		981
381	static void	982	if (loop_done != 2)
382	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	983	loop_done = 0;
		984	}
		985
		986	void
		987	ev_unloop (EV_P_ int how)
		988	{
		989	loop_done = how;
		990	}
		991
		992	/*****************************************************************************/
		993
		994	inline void
		995	wlist_add (WL *head, WL elem)
383	{	996	{
384	elem->next = *head;	997	elem->next = *head;
385	*head = elem;	998	*head = elem;
386	}	999	}
387		1000
388	static void	1001	inline void
389	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1002	wlist_del (WL *head, WL elem)
390	{	1003	{
391	while (*head)	1004	while (*head)
392	{	1005	{
393	if (*head == elem)	1006	if (*head == elem)
394	{	1007	{
…		…
398		1011
399	head = &(*head)->next;	1012	head = &(*head)->next;
400	}	1013	}
401	}	1014	}
402		1015
403	static void	1016	inline void
404	ev_start (struct ev_watcher *w, int active)	1017	ev_clear_pending (EV_P_ W w)
405	{	1018	{
		1019	if (w->pending)
		1020	{
		1021	pendings [ABSPRI (w)][w->pending - 1].w = 0;
406	w->pending = 0;	1022	w->pending = 0;
		1023	}
		1024	}
		1025
		1026	inline void
		1027	ev_start (EV_P_ W w, int active)
		1028	{
		1029	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1030	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1031
407	w->active = active;	1032	w->active = active;
		1033	ev_ref (EV_A);
408	}	1034	}
409		1035
410	static void	1036	inline void
411	ev_stop (struct ev_watcher *w)	1037	ev_stop (EV_P_ W w)
412	{	1038	{
413	if (w->pending)	1039	ev_unref (EV_A);
414	pendings [w->pending - 1].w = 0;
415
416	w->active = 0;	1040	w->active = 0;
417	/* nop */
418	}	1041	}
419		1042
		1043	/*****************************************************************************/
		1044
420	void	1045	void
421	evio_start (struct ev_io *w)	1046	ev_io_start (EV_P_ struct ev_io *w)
422	{	1047	{
		1048	int fd = w->fd;
		1049
423	if (ev_is_active (w))	1050	if (ev_is_active (w))
424	return;	1051	return;
425		1052
426	int fd = w->fd;	1053	assert (("ev_io_start called with negative fd", fd >= 0));
427		1054
428	ev_start ((struct ev_watcher *)w, 1);	1055	ev_start (EV_A_ (W)w, 1);
429	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1056	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
430	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1057	wlist_add ((WL *)&anfds[fd].head, (WL)w);
431		1058
432	++fdchangecnt;	1059	fd_change (EV_A_ fd);
433	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
434	fdchanges [fdchangecnt - 1] = fd;
435	}	1060	}
436		1061
437	void	1062	void
438	evio_stop (struct ev_io *w)	1063	ev_io_stop (EV_P_ struct ev_io *w)
439	{	1064	{
		1065	ev_clear_pending (EV_A_ (W)w);
440	if (!ev_is_active (w))	1066	if (!ev_is_active (w))
441	return;	1067	return;
442		1068
443	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1069	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
444	ev_stop ((struct ev_watcher *)w);	1070	ev_stop (EV_A_ (W)w);
445		1071
446	++fdchangecnt;	1072	fd_change (EV_A_ w->fd);
447	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
448	fdchanges [fdchangecnt - 1] = w->fd;
449	}	1073	}
450		1074
451	void	1075	void
452	evtimer_start (struct ev_timer *w)	1076	ev_timer_start (EV_P_ struct ev_timer *w)
453	{	1077	{
454	if (ev_is_active (w))	1078	if (ev_is_active (w))
455	return;	1079	return;
456		1080
457	if (w->is_abs)	1081	w->at += mn_now;
		1082
		1083	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1084
		1085	ev_start (EV_A_ (W)w, ++timercnt);
		1086	array_needsize (timers, timermax, timercnt, );
		1087	timers [timercnt - 1] = w;
		1088	upheap ((WT *)timers, timercnt - 1);
		1089	}
		1090
		1091	void
		1092	ev_timer_stop (EV_P_ struct ev_timer *w)
		1093	{
		1094	ev_clear_pending (EV_A_ (W)w);
		1095	if (!ev_is_active (w))
		1096	return;
		1097
		1098	if (w->active < timercnt--)
		1099	{
		1100	timers [w->active - 1] = timers [timercnt];
		1101	downheap ((WT *)timers, timercnt, w->active - 1);
458	{	1102	}
459	/* this formula differs from the one in timer_reify becuse we do not round up */	1103
		1104	w->at = w->repeat;
		1105
		1106	ev_stop (EV_A_ (W)w);
		1107	}
		1108
		1109	void
		1110	ev_timer_again (EV_P_ struct ev_timer *w)
		1111	{
		1112	if (ev_is_active (w))
		1113	{
460	if (w->repeat)	1114	if (w->repeat)
		1115	{
		1116	w->at = mn_now + w->repeat;
		1117	downheap ((WT *)timers, timercnt, w->active - 1);
		1118	}
		1119	else
		1120	ev_timer_stop (EV_A_ w);
		1121	}
		1122	else if (w->repeat)
		1123	ev_timer_start (EV_A_ w);
		1124	}
		1125
		1126	void
		1127	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1128	{
		1129	if (ev_is_active (w))
		1130	return;
		1131
		1132	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1133
		1134	/* this formula differs from the one in periodic_reify because we do not always round up */
		1135	if (w->interval)
461	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1136	w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
462		1137
463	ev_start ((struct ev_watcher *)w, ++atimercnt);	1138	ev_start (EV_A_ (W)w, ++periodiccnt);
464	array_needsize (atimers, atimermax, atimercnt, );	1139	array_needsize (periodics, periodicmax, periodiccnt, );
465	atimers [atimercnt - 1] = w;	1140	periodics [periodiccnt - 1] = w;
466	upheap (atimers, atimercnt - 1);	1141	upheap ((WT *)periodics, periodiccnt - 1);
		1142	}
		1143
		1144	void
		1145	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1146	{
		1147	ev_clear_pending (EV_A_ (W)w);
		1148	if (!ev_is_active (w))
		1149	return;
		1150
		1151	if (w->active < periodiccnt--)
467	}	1152	{
		1153	periodics [w->active - 1] = periodics [periodiccnt];
		1154	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		1155	}
		1156
		1157	ev_stop (EV_A_ (W)w);
		1158	}
		1159
		1160	void
		1161	ev_idle_start (EV_P_ struct ev_idle *w)
		1162	{
		1163	if (ev_is_active (w))
		1164	return;
		1165
		1166	ev_start (EV_A_ (W)w, ++idlecnt);
		1167	array_needsize (idles, idlemax, idlecnt, );
		1168	idles [idlecnt - 1] = w;
		1169	}
		1170
		1171	void
		1172	ev_idle_stop (EV_P_ struct ev_idle *w)
		1173	{
		1174	ev_clear_pending (EV_A_ (W)w);
		1175	if (ev_is_active (w))
		1176	return;
		1177
		1178	idles [w->active - 1] = idles [--idlecnt];
		1179	ev_stop (EV_A_ (W)w);
		1180	}
		1181
		1182	void
		1183	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1184	{
		1185	if (ev_is_active (w))
		1186	return;
		1187
		1188	ev_start (EV_A_ (W)w, ++preparecnt);
		1189	array_needsize (prepares, preparemax, preparecnt, );
		1190	prepares [preparecnt - 1] = w;
		1191	}
		1192
		1193	void
		1194	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1195	{
		1196	ev_clear_pending (EV_A_ (W)w);
		1197	if (ev_is_active (w))
		1198	return;
		1199
		1200	prepares [w->active - 1] = prepares [--preparecnt];
		1201	ev_stop (EV_A_ (W)w);
		1202	}
		1203
		1204	void
		1205	ev_check_start (EV_P_ struct ev_check *w)
		1206	{
		1207	if (ev_is_active (w))
		1208	return;
		1209
		1210	ev_start (EV_A_ (W)w, ++checkcnt);
		1211	array_needsize (checks, checkmax, checkcnt, );
		1212	checks [checkcnt - 1] = w;
		1213	}
		1214
		1215	void
		1216	ev_check_stop (EV_P_ struct ev_check *w)
		1217	{
		1218	ev_clear_pending (EV_A_ (W)w);
		1219	if (ev_is_active (w))
		1220	return;
		1221
		1222	checks [w->active - 1] = checks [--checkcnt];
		1223	ev_stop (EV_A_ (W)w);
		1224	}
		1225
		1226	#ifndef SA_RESTART
		1227	# define SA_RESTART 0
		1228	#endif
		1229
		1230	void
		1231	ev_signal_start (EV_P_ struct ev_signal *w)
		1232	{
		1233	#if EV_MULTIPLICITY
		1234	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1235	#endif
		1236	if (ev_is_active (w))
		1237	return;
		1238
		1239	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1240
		1241	ev_start (EV_A_ (W)w, 1);
		1242	array_needsize (signals, signalmax, w->signum, signals_init);
		1243	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1244
		1245	if (!w->next)
		1246	{
		1247	struct sigaction sa;
		1248	sa.sa_handler = sighandler;
		1249	sigfillset (&sa.sa_mask);
		1250	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1251	sigaction (w->signum, &sa, 0);
		1252	}
		1253	}
		1254
		1255	void
		1256	ev_signal_stop (EV_P_ struct ev_signal *w)
		1257	{
		1258	ev_clear_pending (EV_A_ (W)w);
		1259	if (!ev_is_active (w))
		1260	return;
		1261
		1262	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1263	ev_stop (EV_A_ (W)w);
		1264
		1265	if (!signals [w->signum - 1].head)
		1266	signal (w->signum, SIG_DFL);
		1267	}
		1268
		1269	void
		1270	ev_child_start (EV_P_ struct ev_child *w)
		1271	{
		1272	#if EV_MULTIPLICITY
		1273	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1274	#endif
		1275	if (ev_is_active (w))
		1276	return;
		1277
		1278	ev_start (EV_A_ (W)w, 1);
		1279	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1280	}
		1281
		1282	void
		1283	ev_child_stop (EV_P_ struct ev_child *w)
		1284	{
		1285	ev_clear_pending (EV_A_ (W)w);
		1286	if (ev_is_active (w))
		1287	return;
		1288
		1289	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1290	ev_stop (EV_A_ (W)w);
		1291	}
		1292
		1293	/*****************************************************************************/
		1294
		1295	struct ev_once
		1296	{
		1297	struct ev_io io;
		1298	struct ev_timer to;
		1299	void (*cb)(int revents, void *arg);
		1300	void *arg;
		1301	};
		1302
		1303	static void
		1304	once_cb (EV_P_ struct ev_once *once, int revents)
		1305	{
		1306	void (*cb)(int revents, void *arg) = once->cb;
		1307	void *arg = once->arg;
		1308
		1309	ev_io_stop (EV_A_ &once->io);
		1310	ev_timer_stop (EV_A_ &once->to);
		1311	free (once);
		1312
		1313	cb (revents, arg);
		1314	}
		1315
		1316	static void
		1317	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1318	{
		1319	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1320	}
		1321
		1322	static void
		1323	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1324	{
		1325	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1326	}
		1327
		1328	void
		1329	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1330	{
		1331	struct ev_once *once = malloc (sizeof (struct ev_once));
		1332
		1333	if (!once)
		1334	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
468	else	1335	else
469	{	1336	{
470	w->at += now;	1337	once->cb = cb;
		1338	once->arg = arg;
471		1339
472	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1340	ev_watcher_init (&once->io, once_cb_io);
473	array_needsize (rtimers, rtimermax, rtimercnt, );	1341	if (fd >= 0)
474	rtimers [rtimercnt - 1] = w;
475	upheap (rtimers, rtimercnt - 1);
476	}
477
478	}
479
480	void
481	evtimer_stop (struct ev_timer *w)
482	{
483	if (!ev_is_active (w))
484	return;
485
486	if (w->is_abs)
487	{
488	if (w->active < atimercnt--)
489	{	1342	{
490	atimers [w->active - 1] = atimers [atimercnt];	1343	ev_io_set (&once->io, fd, events);
491	downheap (atimers, atimercnt, w->active - 1);	1344	ev_io_start (EV_A_ &once->io);
492	}	1345	}
493	}	1346
494	else	1347	ev_watcher_init (&once->to, once_cb_to);
495	{	1348	if (timeout >= 0.)
496	if (w->active < rtimercnt--)
497	{	1349	{
498	rtimers [w->active - 1] = rtimers [rtimercnt];	1350	ev_timer_set (&once->to, timeout, 0.);
499	downheap (rtimers, rtimercnt, w->active - 1);	1351	ev_timer_start (EV_A_ &once->to);
500	}	1352	}
501	}	1353	}
502
503	ev_stop ((struct ev_watcher *)w);
504	}	1354	}
505		1355
506	void
507	evsignal_start (struct ev_signal *w)
508	{
509	if (ev_is_active (w))
510	return;
511
512	ev_start ((struct ev_watcher *)w, 1);
513	array_needsize (signals, signalmax, w->signum, signals_init);
514	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
515	}
516
517	void
518	evsignal_stop (struct ev_signal *w)
519	{
520	if (!ev_is_active (w))
521	return;
522
523	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
524	ev_stop ((struct ev_watcher *)w);
525	}
526
527	/*****************************************************************************/
528	#if 1
529
530	static void
531	sin_cb (struct ev_io *w, int revents)
532	{
533	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
534	}
535
536	static void
537	ocb (struct ev_timer *w, int revents)
538	{
539	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
540	evtimer_stop (w);
541	evtimer_start (w);
542	}
543
544	int main (void)
545	{
546	struct ev_io sin;
547
548	ev_init (0);
549
550	evw_init (&sin, sin_cb, 55);
551	evio_set (&sin, 0, EV_READ);
552	evio_start (&sin);
553
554	struct ev_timer t[10000];
555
556	#if 1
557	int i;
558	for (i = 0; i < 10000; ++i)
559	{
560	struct ev_timer *w = t + i;
561	evw_init (w, ocb, i);
562	evtimer_set_abs (w, drand48 (), 0.99775533);
563	evtimer_start (w);
564	if (drand48 () < 0.5)
565	evtimer_stop (w);
566	}
567	#endif
568
569	struct ev_timer t1;
570	evw_init (&t1, ocb, 0);
571	evtimer_set_abs (&t1, 5, 10);
572	evtimer_start (&t1);
573
574	ev_loop (0);
575
576	return 0;
577	}
578
579	#endif
580
581
582
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