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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 1.85 by root, Sat Nov 10 03:13:50 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
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
		56
1	#include <math.h>	57	#include <math.h>
2	#include <stdlib.h>	58	#include <stdlib.h>
		59	#include <fcntl.h>
		60	#include <stddef.h>
3		61
4	#include <stdio.h>	62	#include <stdio.h>
5		63
		64	#include <assert.h>
6	#include <errno.h>	65	#include <errno.h>
7	#include <sys/time.h>	66	#include <sys/types.h>
8	#include <time.h>	67	#include <time.h>
9		68
		69	#include <signal.h>
		70
		71	#ifndef WIN32
		72	# include <unistd.h>
		73	# include <sys/time.h>
		74	# include <sys/wait.h>
		75	#endif
		76	/**/
		77
		78	#ifndef EV_USE_MONOTONIC
		79	# define EV_USE_MONOTONIC 1
		80	#endif
		81
		82	#ifndef EV_USE_SELECT
		83	# define EV_USE_SELECT 1
		84	#endif
		85
		86	#ifndef EV_USE_POLL
		87	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		88	#endif
		89
		90	#ifndef EV_USE_EPOLL
		91	# define EV_USE_EPOLL 0
		92	#endif
		93
		94	#ifndef EV_USE_KQUEUE
		95	# define EV_USE_KQUEUE 0
		96	#endif
		97
		98	#ifndef EV_USE_WIN32
		99	# ifdef WIN32
		100	# define EV_USE_WIN32 0 /* it does not exist, use select */
		101	# undef EV_USE_SELECT
		102	# define EV_USE_SELECT 1
		103	# else
		104	# define EV_USE_WIN32 0
		105	# endif
		106	#endif
		107
		108	#ifndef EV_USE_REALTIME
		109	# define EV_USE_REALTIME 1
		110	#endif
		111
		112	/**/
		113
10	#ifdef CLOCK_MONOTONIC	114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	116	# define EV_USE_MONOTONIC 0
12	#endif	117	#endif
13		118
14	#define HAVE_EPOLL 1	119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	121	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	122	#endif
17		123
18	#define MAX_BLOCKTIME 60.	124	/**/
19		125
		126	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		127	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		128	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		129	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
		130
		131	#ifdef EV_H
		132	# include EV_H
		133	#else
20	#include "ev.h"	134	# include "ev.h"
		135	#endif
21		136
		137	#if __GNUC__ >= 3
		138	# define expect(expr,value) __builtin_expect ((expr),(value))
		139	# define inline inline
		140	#else
		141	# define expect(expr,value) (expr)
		142	# define inline static
		143	#endif
		144
		145	#define expect_false(expr) expect ((expr) != 0, 0)
		146	#define expect_true(expr) expect ((expr) != 0, 1)
		147
		148	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		149	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		150
22	struct ev_watcher {	151	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	152	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	153	typedef struct ev_watcher_time *WT;
28	};
29		154
30	ev_tstamp ev_now;	155	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
31	int ev_method;
32		156
33	static int have_monotonic; /* runtime */	157	#include "ev_win32.c"
34		158
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	159	/*****************************************************************************/
36	static void (*method_reify)(void);
37	static void (*method_poll)(ev_tstamp timeout);
38		160
39	ev_tstamp	161	static void (*syserr_cb)(const char *msg);
		162
		163	void ev_set_syserr_cb (void (*cb)(const char *msg))
		164	{
		165	syserr_cb = cb;
		166	}
		167
		168	static void
		169	syserr (const char *msg)
		170	{
		171	if (!msg)
		172	msg = "(libev) system error";
		173
		174	if (syserr_cb)
		175	syserr_cb (msg);
		176	else
		177	{
		178	perror (msg);
		179	abort ();
		180	}
		181	}
		182
		183	static void *(*alloc)(void *ptr, long size);
		184
		185	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		186	{
		187	alloc = cb;
		188	}
		189
		190	static void *
		191	ev_realloc (void *ptr, long size)
		192	{
		193	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		194
		195	if (!ptr && size)
		196	{
		197	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		198	abort ();
		199	}
		200
		201	return ptr;
		202	}
		203
		204	#define ev_malloc(size) ev_realloc (0, (size))
		205	#define ev_free(ptr) ev_realloc ((ptr), 0)
		206
		207	/*****************************************************************************/
		208
		209	typedef struct
		210	{
		211	WL head;
		212	unsigned char events;
		213	unsigned char reify;
		214	} ANFD;
		215
		216	typedef struct
		217	{
		218	W w;
		219	int events;
		220	} ANPENDING;
		221
		222	#if EV_MULTIPLICITY
		223
		224	struct ev_loop
		225	{
		226	#define VAR(name,decl) decl;
		227	#include "ev_vars.h"
		228	#undef VAR
		229	};
		230	#include "ev_wrap.h"
		231
		232	struct ev_loop default_loop_struct;
		233	static struct ev_loop *default_loop;
		234
		235	#else
		236
		237	#define VAR(name,decl) static decl;
		238	#include "ev_vars.h"
		239	#undef VAR
		240
		241	static int default_loop;
		242
		243	#endif
		244
		245	/*****************************************************************************/
		246
		247	inline ev_tstamp
40	ev_time (void)	248	ev_time (void)
41	{	249	{
42	#if HAVE_REALTIME	250	#if EV_USE_REALTIME
43	struct timespec ts;	251	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	252	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	253	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	254	#else
47	struct timeval tv;	255	struct timeval tv;
48	gettimeofday (&tv, 0);	256	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	257	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	258	#endif
51	}	259	}
52		260
53	static ev_tstamp	261	inline ev_tstamp
54	get_clock (void)	262	get_clock (void)
55	{	263	{
56	#if HAVE_MONOTONIC	264	#if EV_USE_MONOTONIC
57	if (have_monotonic)	265	if (expect_true (have_monotonic))
58	{	266	{
59	struct timespec ts;	267	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	268	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	269	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	270	}
63	#endif	271	#endif
64		272
65	return ev_time ();	273	return ev_time ();
66	}	274	}
67		275
		276	#if EV_MULTIPLICITY
		277	ev_tstamp
		278	ev_now (EV_P)
		279	{
		280	return ev_rt_now;
		281	}
		282	#endif
		283
		284	#define array_roundsize(type,n) ((n) | 4 & ~3)
		285
68	#define array_needsize(base,cur,cnt,init) \	286	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	287	if (expect_false ((cnt) > cur)) \
70	{ \	288	{ \
71	int newcnt = cur ? cur << 1 : 16; \	289	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	290	do \
		291	{ \
		292	newcnt = array_roundsize (type, newcnt << 1); \
		293	} \
		294	while ((cnt) > newcnt); \
		295	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	296	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
74	init (base + cur, newcnt - cur); \	297	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	298	cur = newcnt; \
76	}	299	}
77		300
78	typedef struct	301	#define array_slim(type,stem) \
79	{	302	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
80	struct ev_io *head;	303	{ \
81	unsigned char wev, rev; /* want, received event set */	304	stem ## max = array_roundsize (stem ## cnt >> 1); \
82	} ANFD;	305	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		306	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		307	}
83		308
84	static ANFD *anfds;	309	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
85	static int anfdmax;	310	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		311	#define array_free_microshit(stem) \
		312	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
86		313
87	static int *fdchanges;	314	#define array_free(stem, idx) \
88	static int fdchangemax, fdchangecnt;	315	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		316
		317	/*****************************************************************************/
89		318
90	static void	319	static void
91	anfds_init (ANFD *base, int count)	320	anfds_init (ANFD *base, int count)
92	{	321	{
93	while (count--)	322	while (count--)
94	{	323	{
95	base->head = 0;	324	base->head = 0;
96	base->wev = base->rev = EV_NONE;	325	base->events = EV_NONE;
		326	base->reify = 0;
		327
97	++base;	328	++base;
98	}	329	}
99	}	330	}
100		331
101	typedef struct	332	void
		333	ev_feed_event (EV_P_ void *w, int revents)
102	{	334	{
103	struct ev_watcher *w;	335	W w_ = (W)w;
104	int events;
105	} ANPENDING;
106		336
107	static ANPENDING *pendings;	337	if (w_->pending)
108	static int pendingmax, pendingcnt;	338	{
		339	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		340	return;
		341	}
109		342
110	static void
111	event (struct ev_watcher *w, int events)
112	{
113	w->pending = ++pendingcnt;	343	w_->pending = ++pendingcnt [ABSPRI (w_)];
114	array_needsize (pendings, pendingmax, pendingcnt, );	344	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
115	pendings [pendingcnt - 1].w = w;	345	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
116	pendings [pendingcnt - 1].events = events;	346	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
117	}	347	}
118		348
119	static void	349	static void
		350	queue_events (EV_P_ W *events, int eventcnt, int type)
		351	{
		352	int i;
		353
		354	for (i = 0; i < eventcnt; ++i)
		355	ev_feed_event (EV_A_ events [i], type);
		356	}
		357
		358	inline void
120	fd_event (int fd, int events)	359	fd_event (EV_P_ int fd, int revents)
121	{	360	{
122	ANFD *anfd = anfds + fd;	361	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	362	struct ev_io *w;
124		363
125	for (w = anfd->head; w; w = w->next)	364	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
126	{	365	{
127	int ev = w->events & events;	366	int ev = w->events & revents;
128		367
129	if (ev)	368	if (ev)
130	event ((struct ev_watcher *)w, ev);	369	ev_feed_event (EV_A_ (W)w, ev);
		370	}
		371	}
		372
		373	void
		374	ev_feed_fd_event (EV_P_ int fd, int revents)
		375	{
		376	fd_event (EV_A_ fd, revents);
		377	}
		378
		379	/*****************************************************************************/
		380
		381	static void
		382	fd_reify (EV_P)
		383	{
		384	int i;
		385
		386	for (i = 0; i < fdchangecnt; ++i)
		387	{
		388	int fd = fdchanges [i];
		389	ANFD *anfd = anfds + fd;
		390	struct ev_io *w;
		391
		392	int events = 0;
		393
		394	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		395	events |= w->events;
		396
		397	anfd->reify = 0;
		398
		399	method_modify (EV_A_ fd, anfd->events, events);
		400	anfd->events = events;
		401	}
		402
		403	fdchangecnt = 0;
		404	}
		405
		406	static void
		407	fd_change (EV_P_ int fd)
		408	{
		409	if (anfds [fd].reify)
		410	return;
		411
		412	anfds [fd].reify = 1;
		413
		414	++fdchangecnt;
		415	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		416	fdchanges [fdchangecnt - 1] = fd;
		417	}
		418
		419	static void
		420	fd_kill (EV_P_ int fd)
		421	{
		422	struct ev_io *w;
		423
		424	while ((w = (struct ev_io *)anfds [fd].head))
		425	{
		426	ev_io_stop (EV_A_ w);
		427	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		428	}
		429	}
		430
		431	static int
		432	fd_valid (int fd)
		433	{
		434	#ifdef WIN32
		435	return !!win32_get_osfhandle (fd);
		436	#else
		437	return fcntl (fd, F_GETFD) != -1;
		438	#endif
		439	}
		440
		441	/* called on EBADF to verify fds */
		442	static void
		443	fd_ebadf (EV_P)
		444	{
		445	int fd;
		446
		447	for (fd = 0; fd < anfdmax; ++fd)
		448	if (anfds [fd].events)
		449	if (!fd_valid (fd) == -1 && errno == EBADF)
		450	fd_kill (EV_A_ fd);
		451	}
		452
		453	/* called on ENOMEM in select/poll to kill some fds and retry */
		454	static void
		455	fd_enomem (EV_P)
		456	{
		457	int fd;
		458
		459	for (fd = anfdmax; fd--; )
		460	if (anfds [fd].events)
		461	{
		462	fd_kill (EV_A_ fd);
		463	return;
131	}	464	}
132	}	465	}
133		466
134	static struct ev_timer **timers;	467	/* usually called after fork if method needs to re-arm all fds from scratch */
135	static int timermax, timercnt;
136
137	static void	468	static void
138	upheap (int k)	469	fd_rearm_all (EV_P)
139	{	470	{
140	struct ev_timer *w = timers [k];	471	int fd;
141		472
		473	/* this should be highly optimised to not do anything but set a flag */
		474	for (fd = 0; fd < anfdmax; ++fd)
		475	if (anfds [fd].events)
		476	{
		477	anfds [fd].events = 0;
		478	fd_change (EV_A_ fd);
		479	}
		480	}
		481
		482	/*****************************************************************************/
		483
		484	static void
		485	upheap (WT *heap, int k)
		486	{
		487	WT w = heap [k];
		488
142	while (k && timers [k >> 1]->at > w->at)	489	while (k && heap [k >> 1]->at > w->at)
143	{	490	{
144	timers [k] = timers [k >> 1];	491	heap [k] = heap [k >> 1];
145	timers [k]->active = k + 1;	492	((W)heap [k])->active = k + 1;
146	k >>= 1;	493	k >>= 1;
147	}	494	}
148		495
149	timers [k] = w;	496	heap [k] = w;
150	timers [k]->active = k + 1;	497	((W)heap [k])->active = k + 1;
151		498
152	}	499	}
153		500
154	static void	501	static void
155	downheap (int k)	502	downheap (WT *heap, int N, int k)
156	{	503	{
157	struct ev_timer *w = timers [k];	504	WT w = heap [k];
158		505
159	while (k < (timercnt >> 1))	506	while (k < (N >> 1))
160	{	507	{
161	int j = k << 1;	508	int j = k << 1;
162		509
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	510	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
164	++j;	511	++j;
165		512
166	if (w->at <= timers [j]->at)	513	if (w->at <= heap [j]->at)
167	break;	514	break;
168		515
169	timers [k] = timers [j];	516	heap [k] = heap [j];
170	timers [k]->active = k + 1;	517	((W)heap [k])->active = k + 1;
171	k = j;	518	k = j;
172	}	519	}
173		520
174	timers [k] = w;	521	heap [k] = w;
175	timers [k]->active = k + 1;	522	((W)heap [k])->active = k + 1;
176	}	523	}
177		524
178	static struct ev_signal **signals;	525	inline void
		526	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		527	{
		528	ev_tstamp old_at = heap [k]->at;
		529	heap [k]->at = at;
		530
		531	if (old_at < at)
		532	downheap (heap, N, k);
		533	else
		534	upheap (heap, k);
		535	}
		536
		537	/*****************************************************************************/
		538
		539	typedef struct
		540	{
		541	WL head;
		542	sig_atomic_t volatile gotsig;
		543	} ANSIG;
		544
		545	static ANSIG *signals;
179	static int signalmax, signalcnt;	546	static int signalmax;
180		547
		548	static int sigpipe [2];
		549	static sig_atomic_t volatile gotsig;
		550	static struct ev_io sigev;
		551
181	static void	552	static void
182	signals_init (struct ev_signal **base, int count)	553	signals_init (ANSIG *base, int count)
183	{	554	{
184	while (count--)	555	while (count--)
185	*base++ = 0;	556	{
186	}	557	base->head = 0;
		558	base->gotsig = 0;
187		559
		560	++base;
		561	}
		562	}
		563
		564	static void
		565	sighandler (int signum)
		566	{
		567	#if WIN32
		568	signal (signum, sighandler);
		569	#endif
		570
		571	signals [signum - 1].gotsig = 1;
		572
		573	if (!gotsig)
		574	{
		575	int old_errno = errno;
		576	gotsig = 1;
		577	#ifdef WIN32
		578	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		579	#else
		580	write (sigpipe [1], &signum, 1);
		581	#endif
		582	errno = old_errno;
		583	}
		584	}
		585
		586	void
		587	ev_feed_signal_event (EV_P_ int signum)
		588	{
		589	WL w;
		590
		591	#if EV_MULTIPLICITY
		592	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		593	#endif
		594
		595	--signum;
		596
		597	if (signum < 0 || signum >= signalmax)
		598	return;
		599
		600	signals [signum].gotsig = 0;
		601
		602	for (w = signals [signum].head; w; w = w->next)
		603	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		604	}
		605
		606	static void
		607	sigcb (EV_P_ struct ev_io *iow, int revents)
		608	{
		609	int signum;
		610
		611	#ifdef WIN32
		612	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		613	#else
		614	read (sigpipe [0], &revents, 1);
		615	#endif
		616	gotsig = 0;
		617
		618	for (signum = signalmax; signum--; )
		619	if (signals [signum].gotsig)
		620	ev_feed_signal_event (EV_A_ signum + 1);
		621	}
		622
		623	static void
		624	siginit (EV_P)
		625	{
		626	#ifndef WIN32
		627	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		628	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		629
		630	/* rather than sort out wether we really need nb, set it */
		631	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		632	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		633	#endif
		634
		635	ev_io_set (&sigev, sigpipe [0], EV_READ);
		636	ev_io_start (EV_A_ &sigev);
		637	ev_unref (EV_A); /* child watcher should not keep loop alive */
		638	}
		639
		640	/*****************************************************************************/
		641
		642	static struct ev_child *childs [PID_HASHSIZE];
		643
		644	#ifndef WIN32
		645
		646	static struct ev_signal childev;
		647
		648	#ifndef WCONTINUED
		649	# define WCONTINUED 0
		650	#endif
		651
		652	static void
		653	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		654	{
		655	struct ev_child *w;
		656
		657	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		658	if (w->pid == pid || !w->pid)
		659	{
		660	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		661	w->rpid = pid;
		662	w->rstatus = status;
		663	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		664	}
		665	}
		666
		667	static void
		668	childcb (EV_P_ struct ev_signal *sw, int revents)
		669	{
		670	int pid, status;
		671
		672	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		673	{
		674	/* make sure we are called again until all childs have been reaped */
		675	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		676
		677	child_reap (EV_A_ sw, pid, pid, status);
		678	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		679	}
		680	}
		681
		682	#endif
		683
		684	/*****************************************************************************/
		685
		686	#if EV_USE_KQUEUE
		687	# include "ev_kqueue.c"
		688	#endif
188	#if HAVE_EPOLL	689	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	690	# include "ev_epoll.c"
190	#endif	691	#endif
		692	#if EV_USE_POLL
		693	# include "ev_poll.c"
		694	#endif
191	#if HAVE_SELECT	695	#if EV_USE_SELECT
192	# include "ev_select.c"	696	# include "ev_select.c"
193	#endif	697	#endif
194		698
195	int ev_init (int flags)	699	int
		700	ev_version_major (void)
196	{	701	{
		702	return EV_VERSION_MAJOR;
		703	}
		704
		705	int
		706	ev_version_minor (void)
		707	{
		708	return EV_VERSION_MINOR;
		709	}
		710
		711	/* return true if we are running with elevated privileges and should ignore env variables */
		712	static int
		713	enable_secure (void)
		714	{
		715	#ifdef WIN32
		716	return 0;
		717	#else
		718	return getuid () != geteuid ()
		719	|| getgid () != getegid ();
		720	#endif
		721	}
		722
		723	int
		724	ev_method (EV_P)
		725	{
		726	return method;
		727	}
		728
		729	static void
		730	loop_init (EV_P_ int methods)
		731	{
		732	if (!method)
		733	{
197	#if HAVE_MONOTONIC	734	#if EV_USE_MONOTONIC
198	{	735	{
199	struct timespec ts;	736	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	737	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	738	have_monotonic = 1;
202	}	739	}
203	#endif	740	#endif
204		741
205	ev_now = ev_time ();	742	ev_rt_now = ev_time ();
		743	mn_now = get_clock ();
		744	now_floor = mn_now;
		745	rtmn_diff = ev_rt_now - mn_now;
206		746
		747	if (methods == EVMETHOD_AUTO)
		748	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		749	methods = atoi (getenv ("LIBEV_METHODS"));
		750	else
		751	methods = EVMETHOD_ANY;
		752
		753	method = 0;
		754	#if EV_USE_WIN32
		755	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		756	#endif
		757	#if EV_USE_KQUEUE
		758	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		759	#endif
207	#if HAVE_EPOLL	760	#if EV_USE_EPOLL
208	if (epoll_init (flags))	761	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
209	return ev_method;
210	#endif	762	#endif
		763	#if EV_USE_POLL
		764	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		765	#endif
211	#if HAVE_SELECT	766	#if EV_USE_SELECT
212	if (select_init (flags))	767	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
213	return ev_method;
214	#endif	768	#endif
215		769
216	ev_method = EVMETHOD_NONE;	770	ev_init (&sigev, sigcb);
217	return ev_method;	771	ev_set_priority (&sigev, EV_MAXPRI);
		772	}
218	}	773	}
219		774
220	void ev_prefork (void)	775	void
221	{	776	loop_destroy (EV_P)
222	}
223
224	void ev_postfork_parent (void)
225	{
226	}
227
228	void ev_postfork_child (void)
229	{
230	#if HAVE_EPOLL
231	epoll_postfork_child ();
232	#endif
233	}
234
235	static void
236	call_pending ()
237	{	777	{
238	int i;	778	int i;
239		779
240	for (i = 0; i < pendingcnt; ++i)	780	#if EV_USE_WIN32
		781	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		782	#endif
		783	#if EV_USE_KQUEUE
		784	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		785	#endif
		786	#if EV_USE_EPOLL
		787	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		788	#endif
		789	#if EV_USE_POLL
		790	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		791	#endif
		792	#if EV_USE_SELECT
		793	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		794	#endif
		795
		796	for (i = NUMPRI; i--; )
		797	array_free (pending, [i]);
		798
		799	/* have to use the microsoft-never-gets-it-right macro */
		800	array_free_microshit (fdchange);
		801	array_free_microshit (timer);
		802	array_free_microshit (periodic);
		803	array_free_microshit (idle);
		804	array_free_microshit (prepare);
		805	array_free_microshit (check);
		806
		807	method = 0;
		808	}
		809
		810	static void
		811	loop_fork (EV_P)
		812	{
		813	#if EV_USE_EPOLL
		814	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		815	#endif
		816	#if EV_USE_KQUEUE
		817	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		818	#endif
		819
		820	if (ev_is_active (&sigev))
		821	{
		822	/* default loop */
		823
		824	ev_ref (EV_A);
		825	ev_io_stop (EV_A_ &sigev);
		826	close (sigpipe [0]);
		827	close (sigpipe [1]);
		828
		829	while (pipe (sigpipe))
		830	syserr ("(libev) error creating pipe");
		831
		832	siginit (EV_A);
241	{	833	}
242	ANPENDING *p = pendings + i;
243		834
244	if (p->w)	835	postfork = 0;
		836	}
		837
		838	#if EV_MULTIPLICITY
		839	struct ev_loop *
		840	ev_loop_new (int methods)
		841	{
		842	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		843
		844	memset (loop, 0, sizeof (struct ev_loop));
		845
		846	loop_init (EV_A_ methods);
		847
		848	if (ev_method (EV_A))
		849	return loop;
		850
		851	return 0;
		852	}
		853
		854	void
		855	ev_loop_destroy (EV_P)
		856	{
		857	loop_destroy (EV_A);
		858	ev_free (loop);
		859	}
		860
		861	void
		862	ev_loop_fork (EV_P)
		863	{
		864	postfork = 1;
		865	}
		866
		867	#endif
		868
		869	#if EV_MULTIPLICITY
		870	struct ev_loop *
		871	#else
		872	int
		873	#endif
		874	ev_default_loop (int methods)
		875	{
		876	if (sigpipe [0] == sigpipe [1])
		877	if (pipe (sigpipe))
		878	return 0;
		879
		880	if (!default_loop)
		881	{
		882	#if EV_MULTIPLICITY
		883	struct ev_loop *loop = default_loop = &default_loop_struct;
		884	#else
		885	default_loop = 1;
		886	#endif
		887
		888	loop_init (EV_A_ methods);
		889
		890	if (ev_method (EV_A))
245	{	891	{
246	p->w->pending = 0;	892	siginit (EV_A);
247	p->w->cb (p->w, p->events);	893
		894	#ifndef WIN32
		895	ev_signal_init (&childev, childcb, SIGCHLD);
		896	ev_set_priority (&childev, EV_MAXPRI);
		897	ev_signal_start (EV_A_ &childev);
		898	ev_unref (EV_A); /* child watcher should not keep loop alive */
		899	#endif
248	}	900	}
		901	else
		902	default_loop = 0;
		903	}
		904
		905	return default_loop;
		906	}
		907
		908	void
		909	ev_default_destroy (void)
		910	{
		911	#if EV_MULTIPLICITY
		912	struct ev_loop *loop = default_loop;
		913	#endif
		914
		915	#ifndef WIN32
		916	ev_ref (EV_A); /* child watcher */
		917	ev_signal_stop (EV_A_ &childev);
		918	#endif
		919
		920	ev_ref (EV_A); /* signal watcher */
		921	ev_io_stop (EV_A_ &sigev);
		922
		923	close (sigpipe [0]); sigpipe [0] = 0;
		924	close (sigpipe [1]); sigpipe [1] = 0;
		925
		926	loop_destroy (EV_A);
		927	}
		928
		929	void
		930	ev_default_fork (void)
		931	{
		932	#if EV_MULTIPLICITY
		933	struct ev_loop *loop = default_loop;
		934	#endif
		935
		936	if (method)
		937	postfork = 1;
		938	}
		939
		940	/*****************************************************************************/
		941
		942	static int
		943	any_pending (EV_P)
		944	{
		945	int pri;
		946
		947	for (pri = NUMPRI; pri--; )
		948	if (pendingcnt [pri])
		949	return 1;
		950
		951	return 0;
		952	}
		953
		954	static void
		955	call_pending (EV_P)
		956	{
		957	int pri;
		958
		959	for (pri = NUMPRI; pri--; )
		960	while (pendingcnt [pri])
		961	{
		962	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		963
		964	if (p->w)
		965	{
		966	p->w->pending = 0;
		967	EV_CB_INVOKE (p->w, p->events);
		968	}
249	}	969	}
250
251	pendingcnt = 0;
252	}	970	}
253		971
254	static void	972	static void
255	timer_reify (void)	973	timers_reify (EV_P)
256	{	974	{
257	while (timercnt && timers [0]->at <= ev_now)	975	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	976	{
259	struct ev_timer *w = timers [0];	977	struct ev_timer *w = timers [0];
260		978
		979	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		980
261	/* first reschedule timer */	981	/* first reschedule or stop timer */
262	if (w->repeat)	982	if (w->repeat)
263	{	983	{
264	if (w->is_abs)	984	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
265	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
266	else
267	w->at = ev_now + w->repeat;	985	((WT)w)->at = mn_now + w->repeat;
268		986	downheap ((WT *)timers, timercnt, 0);
269	downheap (0);
270	}	987	}
271	else	988	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	989	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		990
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	991	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		992	}
		993	}
		994
		995	static void
		996	periodics_reify (EV_P)
		997	{
		998	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
275	}	999	{
276	}	1000	struct ev_periodic *w = periodics [0];
277		1001
278	int ev_loop_done;	1002	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
279		1003
		1004	/* first reschedule or stop timer */
		1005	if (w->reschedule_cb)
		1006	{
		1007	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1008
		1009	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1010	downheap ((WT *)periodics, periodiccnt, 0);
		1011	}
		1012	else if (w->interval)
		1013	{
		1014	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1015	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1016	downheap ((WT *)periodics, periodiccnt, 0);
		1017	}
		1018	else
		1019	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1020
		1021	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1022	}
		1023	}
		1024
		1025	static void
		1026	periodics_reschedule (EV_P)
		1027	{
		1028	int i;
		1029
		1030	/* adjust periodics after time jump */
		1031	for (i = 0; i < periodiccnt; ++i)
		1032	{
		1033	struct ev_periodic *w = periodics [i];
		1034
		1035	if (w->reschedule_cb)
		1036	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1037	else if (w->interval)
		1038	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1039	}
		1040
		1041	/* now rebuild the heap */
		1042	for (i = periodiccnt >> 1; i--; )
		1043	downheap ((WT *)periodics, periodiccnt, i);
		1044	}
		1045
		1046	inline int
		1047	time_update_monotonic (EV_P)
		1048	{
		1049	mn_now = get_clock ();
		1050
		1051	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1052	{
		1053	ev_rt_now = rtmn_diff + mn_now;
		1054	return 0;
		1055	}
		1056	else
		1057	{
		1058	now_floor = mn_now;
		1059	ev_rt_now = ev_time ();
		1060	return 1;
		1061	}
		1062	}
		1063
		1064	static void
		1065	time_update (EV_P)
		1066	{
		1067	int i;
		1068
		1069	#if EV_USE_MONOTONIC
		1070	if (expect_true (have_monotonic))
		1071	{
		1072	if (time_update_monotonic (EV_A))
		1073	{
		1074	ev_tstamp odiff = rtmn_diff;
		1075
		1076	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1077	{
		1078	rtmn_diff = ev_rt_now - mn_now;
		1079
		1080	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1081	return; /* all is well */
		1082
		1083	ev_rt_now = ev_time ();
		1084	mn_now = get_clock ();
		1085	now_floor = mn_now;
		1086	}
		1087
		1088	periodics_reschedule (EV_A);
		1089	/* no timer adjustment, as the monotonic clock doesn't jump */
		1090	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1091	}
		1092	}
		1093	else
		1094	#endif
		1095	{
		1096	ev_rt_now = ev_time ();
		1097
		1098	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1099	{
		1100	periodics_reschedule (EV_A);
		1101
		1102	/* adjust timers. this is easy, as the offset is the same for all */
		1103	for (i = 0; i < timercnt; ++i)
		1104	((WT)timers [i])->at += ev_rt_now - mn_now;
		1105	}
		1106
		1107	mn_now = ev_rt_now;
		1108	}
		1109	}
		1110
		1111	void
		1112	ev_ref (EV_P)
		1113	{
		1114	++activecnt;
		1115	}
		1116
		1117	void
		1118	ev_unref (EV_P)
		1119	{
		1120	--activecnt;
		1121	}
		1122
		1123	static int loop_done;
		1124
		1125	void
280	int ev_loop (int flags)	1126	ev_loop (EV_P_ int flags)
281	{	1127	{
282	double block;	1128	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	1129	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
284		1130
285	do	1131	do
286	{	1132	{
		1133	/* queue check watchers (and execute them) */
		1134	if (expect_false (preparecnt))
		1135	{
		1136	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1137	call_pending (EV_A);
		1138	}
		1139
		1140	/* we might have forked, so reify kernel state if necessary */
		1141	if (expect_false (postfork))
		1142	loop_fork (EV_A);
		1143
287	/* update fd-related kernel structures */	1144	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1145	fd_reify (EV_A);
289		1146
290	/* calculate blocking time */	1147	/* calculate blocking time */
		1148
		1149	/* we only need this for !monotonic clock or timers, but as we basically
		1150	always have timers, we just calculate it always */
		1151	#if EV_USE_MONOTONIC
		1152	if (expect_true (have_monotonic))
		1153	time_update_monotonic (EV_A);
		1154	else
		1155	#endif
		1156	{
291	ev_now = ev_time ();	1157	ev_rt_now = ev_time ();
		1158	mn_now = ev_rt_now;
		1159	}
292		1160
293	if (flags & EVLOOP_NONBLOCK)	1161	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	1162	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	1163	else
298	{	1164	{
		1165	block = MAX_BLOCKTIME;
		1166
		1167	if (timercnt)
		1168	{
299	block = timers [0]->at - ev_now + method_fudge;	1169	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
		1170	if (block > to) block = to;
		1171	}
		1172
		1173	if (periodiccnt)
		1174	{
		1175	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
		1176	if (block > to) block = to;
		1177	}
		1178
300	if (block < 0.) block = 0.;	1179	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1180	}
303		1181
304	method_poll (block);	1182	method_poll (EV_A_ block);
305		1183
		1184	/* update ev_rt_now, do magic */
		1185	time_update (EV_A);
		1186
306	/* put pending timers into pendign queue and reschedule them */	1187	/* queue pending timers and reschedule them */
307	timer_reify ();	1188	timers_reify (EV_A); /* relative timers called last */
		1189	periodics_reify (EV_A); /* absolute timers called first */
308		1190
309	ev_now = ev_time ();	1191	/* queue idle watchers unless io or timers are pending */
		1192	if (idlecnt && !any_pending (EV_A))
		1193	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1194
		1195	/* queue check watchers, to be executed first */
		1196	if (checkcnt)
		1197	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1198
310	call_pending ();	1199	call_pending (EV_A);
311	}	1200	}
312	while (!ev_loop_done);	1201	while (activecnt && !loop_done);
313	}
314		1202
315	static void	1203	if (loop_done != 2)
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1204	loop_done = 0;
		1205	}
		1206
		1207	void
		1208	ev_unloop (EV_P_ int how)
		1209	{
		1210	loop_done = how;
		1211	}
		1212
		1213	/*****************************************************************************/
		1214
		1215	inline void
		1216	wlist_add (WL *head, WL elem)
317	{	1217	{
318	elem->next = *head;	1218	elem->next = *head;
319	*head = elem;	1219	*head = elem;
320	}	1220	}
321		1221
322	static void	1222	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1223	wlist_del (WL *head, WL elem)
324	{	1224	{
325	while (*head)	1225	while (*head)
326	{	1226	{
327	if (*head == elem)	1227	if (*head == elem)
328	{	1228	{
…		…
332		1232
333	head = &(*head)->next;	1233	head = &(*head)->next;
334	}	1234	}
335	}	1235	}
336		1236
337	static void	1237	inline void
338	ev_start (struct ev_watcher *w, int active)	1238	ev_clear_pending (EV_P_ W w)
339	{	1239	{
		1240	if (w->pending)
		1241	{
		1242	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	1243	w->pending = 0;
		1244	}
		1245	}
		1246
		1247	inline void
		1248	ev_start (EV_P_ W w, int active)
		1249	{
		1250	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1251	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1252
341	w->active = active;	1253	w->active = active;
		1254	ev_ref (EV_A);
342	}	1255	}
343		1256
344	static void	1257	inline void
345	ev_stop (struct ev_watcher *w)	1258	ev_stop (EV_P_ W w)
346	{	1259	{
347	if (w->pending)	1260	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	1261	w->active = 0;
351	/* nop */
352	}	1262	}
353		1263
		1264	/*****************************************************************************/
		1265
354	void	1266	void
355	evio_start (struct ev_io *w)	1267	ev_io_start (EV_P_ struct ev_io *w)
356	{	1268	{
		1269	int fd = w->fd;
		1270
357	if (ev_is_active (w))	1271	if (ev_is_active (w))
358	return;	1272	return;
359		1273
360	int fd = w->fd;	1274	assert (("ev_io_start called with negative fd", fd >= 0));
361		1275
362	ev_start ((struct ev_watcher *)w, 1);	1276	ev_start (EV_A_ (W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1277	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1278	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		1279
366	++fdchangecnt;	1280	fd_change (EV_A_ fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	1281	}
370		1282
371	void	1283	void
372	evio_stop (struct ev_io *w)	1284	ev_io_stop (EV_P_ struct ev_io *w)
373	{	1285	{
		1286	ev_clear_pending (EV_A_ (W)w);
374	if (!ev_is_active (w))	1287	if (!ev_is_active (w))
375	return;	1288	return;
376		1289
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1290	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	1291	ev_stop (EV_A_ (W)w);
379		1292
380	++fdchangecnt;	1293	fd_change (EV_A_ w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	1294	}
384		1295
385	void	1296	void
386	evtimer_start (struct ev_timer *w)	1297	ev_timer_start (EV_P_ struct ev_timer *w)
387	{	1298	{
388	if (ev_is_active (w))	1299	if (ev_is_active (w))
389	return;	1300	return;
390		1301
391	if (w->is_abs)	1302	((WT)w)->at += mn_now;
		1303
		1304	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1305
		1306	ev_start (EV_A_ (W)w, ++timercnt);
		1307	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1308	timers [timercnt - 1] = w;
		1309	upheap ((WT *)timers, timercnt - 1);
		1310
		1311	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1312	}
		1313
		1314	void
		1315	ev_timer_stop (EV_P_ struct ev_timer *w)
		1316	{
		1317	ev_clear_pending (EV_A_ (W)w);
		1318	if (!ev_is_active (w))
		1319	return;
		1320
		1321	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1322
		1323	if (((W)w)->active < timercnt--)
		1324	{
		1325	timers [((W)w)->active - 1] = timers [timercnt];
		1326	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
392	{	1327	}
393	/* this formula differs from the one in timer_reify becuse we do not round up */	1328
		1329	((WT)w)->at = w->repeat;
		1330
		1331	ev_stop (EV_A_ (W)w);
		1332	}
		1333
		1334	void
		1335	ev_timer_again (EV_P_ struct ev_timer *w)
		1336	{
		1337	if (ev_is_active (w))
		1338	{
394	if (w->repeat)	1339	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1340	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
		1341	else
		1342	ev_timer_stop (EV_A_ w);
		1343	}
		1344	else if (w->repeat)
		1345	ev_timer_start (EV_A_ w);
		1346	}
		1347
		1348	void
		1349	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1350	{
		1351	if (ev_is_active (w))
		1352	return;
		1353
		1354	if (w->reschedule_cb)
		1355	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1356	else if (w->interval)
396	}	1357	{
		1358	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1359	/* this formula differs from the one in periodic_reify because we do not always round up */
		1360	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1361	}
		1362
		1363	ev_start (EV_A_ (W)w, ++periodiccnt);
		1364	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1365	periodics [periodiccnt - 1] = w;
		1366	upheap ((WT *)periodics, periodiccnt - 1);
		1367
		1368	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1369	}
		1370
		1371	void
		1372	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1373	{
		1374	ev_clear_pending (EV_A_ (W)w);
		1375	if (!ev_is_active (w))
		1376	return;
		1377
		1378	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1379
		1380	if (((W)w)->active < periodiccnt--)
		1381	{
		1382	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1383	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1384	}
		1385
		1386	ev_stop (EV_A_ (W)w);
		1387	}
		1388
		1389	void
		1390	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1391	{
		1392	/* TODO: use adjustheap and recalculation */
		1393	ev_periodic_stop (EV_A_ w);
		1394	ev_periodic_start (EV_A_ w);
		1395	}
		1396
		1397	void
		1398	ev_idle_start (EV_P_ struct ev_idle *w)
		1399	{
		1400	if (ev_is_active (w))
		1401	return;
		1402
		1403	ev_start (EV_A_ (W)w, ++idlecnt);
		1404	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1405	idles [idlecnt - 1] = w;
		1406	}
		1407
		1408	void
		1409	ev_idle_stop (EV_P_ struct ev_idle *w)
		1410	{
		1411	ev_clear_pending (EV_A_ (W)w);
		1412	if (ev_is_active (w))
		1413	return;
		1414
		1415	idles [((W)w)->active - 1] = idles [--idlecnt];
		1416	ev_stop (EV_A_ (W)w);
		1417	}
		1418
		1419	void
		1420	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1421	{
		1422	if (ev_is_active (w))
		1423	return;
		1424
		1425	ev_start (EV_A_ (W)w, ++preparecnt);
		1426	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1427	prepares [preparecnt - 1] = w;
		1428	}
		1429
		1430	void
		1431	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1432	{
		1433	ev_clear_pending (EV_A_ (W)w);
		1434	if (ev_is_active (w))
		1435	return;
		1436
		1437	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1438	ev_stop (EV_A_ (W)w);
		1439	}
		1440
		1441	void
		1442	ev_check_start (EV_P_ struct ev_check *w)
		1443	{
		1444	if (ev_is_active (w))
		1445	return;
		1446
		1447	ev_start (EV_A_ (W)w, ++checkcnt);
		1448	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1449	checks [checkcnt - 1] = w;
		1450	}
		1451
		1452	void
		1453	ev_check_stop (EV_P_ struct ev_check *w)
		1454	{
		1455	ev_clear_pending (EV_A_ (W)w);
		1456	if (ev_is_active (w))
		1457	return;
		1458
		1459	checks [((W)w)->active - 1] = checks [--checkcnt];
		1460	ev_stop (EV_A_ (W)w);
		1461	}
		1462
		1463	#ifndef SA_RESTART
		1464	# define SA_RESTART 0
		1465	#endif
		1466
		1467	void
		1468	ev_signal_start (EV_P_ struct ev_signal *w)
		1469	{
		1470	#if EV_MULTIPLICITY
		1471	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1472	#endif
		1473	if (ev_is_active (w))
		1474	return;
		1475
		1476	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1477
		1478	ev_start (EV_A_ (W)w, 1);
		1479	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1480	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1481
		1482	if (!((WL)w)->next)
		1483	{
		1484	#if WIN32
		1485	signal (w->signum, sighandler);
		1486	#else
		1487	struct sigaction sa;
		1488	sa.sa_handler = sighandler;
		1489	sigfillset (&sa.sa_mask);
		1490	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1491	sigaction (w->signum, &sa, 0);
		1492	#endif
		1493	}
		1494	}
		1495
		1496	void
		1497	ev_signal_stop (EV_P_ struct ev_signal *w)
		1498	{
		1499	ev_clear_pending (EV_A_ (W)w);
		1500	if (!ev_is_active (w))
		1501	return;
		1502
		1503	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1504	ev_stop (EV_A_ (W)w);
		1505
		1506	if (!signals [w->signum - 1].head)
		1507	signal (w->signum, SIG_DFL);
		1508	}
		1509
		1510	void
		1511	ev_child_start (EV_P_ struct ev_child *w)
		1512	{
		1513	#if EV_MULTIPLICITY
		1514	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1515	#endif
		1516	if (ev_is_active (w))
		1517	return;
		1518
		1519	ev_start (EV_A_ (W)w, 1);
		1520	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1521	}
		1522
		1523	void
		1524	ev_child_stop (EV_P_ struct ev_child *w)
		1525	{
		1526	ev_clear_pending (EV_A_ (W)w);
		1527	if (ev_is_active (w))
		1528	return;
		1529
		1530	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1531	ev_stop (EV_A_ (W)w);
		1532	}
		1533
		1534	/*****************************************************************************/
		1535
		1536	struct ev_once
		1537	{
		1538	struct ev_io io;
		1539	struct ev_timer to;
		1540	void (*cb)(int revents, void *arg);
		1541	void *arg;
		1542	};
		1543
		1544	static void
		1545	once_cb (EV_P_ struct ev_once *once, int revents)
		1546	{
		1547	void (*cb)(int revents, void *arg) = once->cb;
		1548	void *arg = once->arg;
		1549
		1550	ev_io_stop (EV_A_ &once->io);
		1551	ev_timer_stop (EV_A_ &once->to);
		1552	ev_free (once);
		1553
		1554	cb (revents, arg);
		1555	}
		1556
		1557	static void
		1558	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1559	{
		1560	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1561	}
		1562
		1563	static void
		1564	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1565	{
		1566	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1567	}
		1568
		1569	void
		1570	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1571	{
		1572	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1573
		1574	if (!once)
		1575	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
397	else	1576	else
398	w->at += ev_now;
399
400	ev_start ((struct ev_watcher *)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);
404	}
405
406	void
407	evtimer_stop (struct ev_timer *w)
408	{
409	if (!ev_is_active (w))
410	return;
411
412	if (w->active < timercnt--)
413	{
414	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);
416	}	1577	{
		1578	once->cb = cb;
		1579	once->arg = arg;
417		1580
418	ev_stop ((struct ev_watcher *)w);	1581	ev_init (&once->io, once_cb_io);
419	}	1582	if (fd >= 0)
		1583	{
		1584	ev_io_set (&once->io, fd, events);
		1585	ev_io_start (EV_A_ &once->io);
		1586	}
420		1587
421	void	1588	ev_init (&once->to, once_cb_to);
422	evsignal_start (struct ev_signal *w)	1589	if (timeout >= 0.)
423	{	1590	{
424	if (ev_is_active (w))	1591	ev_timer_set (&once->to, timeout, 0.);
425	return;	1592	ev_timer_start (EV_A_ &once->to);
426		1593	}
427	ev_start ((struct ev_watcher *)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
430	}
431
432	void
433	evsignal_stop (struct ev_signal *w)
434	{
435	if (!ev_is_active (w))
436	return;
437
438	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
439	ev_stop ((struct ev_watcher *)w);
440	}
441
442	/*****************************************************************************/
443	#if 1
444
445	static void
446	sin_cb (struct ev_io *w, int revents)
447	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}
450
451	static void
452	ocb (struct ev_timer *w, int revents)
453	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
455	}
456
457	int main (void)
458	{
459	struct ev_io sin;
460
461	ev_init (0);
462
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);
465	evio_start (&sin);
466
467	struct ev_timer t[1000];
468
469	int i;
470	for (i = 0; i < 1000; ++i)
471	{	1594	}
472	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);
475	evtimer_start (w);
476	if (drand48 () < 0.5)
477	evtimer_stop (w);
478	}
479
480	ev_loop (0);
481
482	return 0;
483	}	1595	}
484		1596
485	#endif
486
487
488
489

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