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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 1.84 by root, Fri Nov 9 23:04:35 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	ev_tstamp
		277	ev_now (EV_P)
		278	{
		279	return rt_now;
		280	}
		281
		282	#define array_roundsize(type,n) ((n) | 4 & ~3)
		283
68	#define array_needsize(base,cur,cnt,init) \	284	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	285	if (expect_false ((cnt) > cur)) \
70	{ \	286	{ \
71	int newcnt = cur ? cur << 1 : 16; \	287	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	288	do \
		289	{ \
		290	newcnt = array_roundsize (type, newcnt << 1); \
		291	} \
		292	while ((cnt) > newcnt); \
		293	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	294	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
74	init (base + cur, newcnt - cur); \	295	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	296	cur = newcnt; \
76	}	297	}
77		298
78	typedef struct	299	#define array_slim(type,stem) \
79	{	300	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
80	struct ev_io *head;	301	{ \
81	unsigned char wev, rev; /* want, received event set */	302	stem ## max = array_roundsize (stem ## cnt >> 1); \
82	} ANFD;	303	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		304	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		305	}
83		306
84	static ANFD *anfds;	307	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
85	static int anfdmax;	308	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		309	#define array_free_microshit(stem) \
		310	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
86		311
87	static int *fdchanges;	312	#define array_free(stem, idx) \
88	static int fdchangemax, fdchangecnt;	313	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		314
		315	/*****************************************************************************/
89		316
90	static void	317	static void
91	anfds_init (ANFD *base, int count)	318	anfds_init (ANFD *base, int count)
92	{	319	{
93	while (count--)	320	while (count--)
94	{	321	{
95	base->head = 0;	322	base->head = 0;
96	base->wev = base->rev = EV_NONE;	323	base->events = EV_NONE;
		324	base->reify = 0;
		325
97	++base;	326	++base;
98	}	327	}
99	}	328	}
100		329
101	typedef struct	330	void
		331	ev_feed_event (EV_P_ void *w, int revents)
102	{	332	{
103	struct ev_watcher *w;	333	W w_ = (W)w;
104	int events;
105	} ANPENDING;
106		334
107	static ANPENDING *pendings;	335	if (w_->pending)
108	static int pendingmax, pendingcnt;	336	{
		337	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		338	return;
		339	}
109		340
110	static void
111	event (struct ev_watcher *w, int events)
112	{
113	w->pending = ++pendingcnt;	341	w_->pending = ++pendingcnt [ABSPRI (w_)];
114	array_needsize (pendings, pendingmax, pendingcnt, );	342	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
115	pendings [pendingcnt - 1].w = w;	343	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
116	pendings [pendingcnt - 1].events = events;	344	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
117	}	345	}
118		346
119	static void	347	static void
		348	queue_events (EV_P_ W *events, int eventcnt, int type)
		349	{
		350	int i;
		351
		352	for (i = 0; i < eventcnt; ++i)
		353	ev_feed_event (EV_A_ events [i], type);
		354	}
		355
		356	inline void
120	fd_event (int fd, int events)	357	fd_event (EV_P_ int fd, int revents)
121	{	358	{
122	ANFD *anfd = anfds + fd;	359	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	360	struct ev_io *w;
124		361
125	for (w = anfd->head; w; w = w->next)	362	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
126	{	363	{
127	int ev = w->events & events;	364	int ev = w->events & revents;
128		365
129	if (ev)	366	if (ev)
130	event ((struct ev_watcher *)w, ev);	367	ev_feed_event (EV_A_ (W)w, ev);
		368	}
		369	}
		370
		371	void
		372	ev_feed_fd_event (EV_P_ int fd, int revents)
		373	{
		374	fd_event (EV_A_ fd, revents);
		375	}
		376
		377	/*****************************************************************************/
		378
		379	static void
		380	fd_reify (EV_P)
		381	{
		382	int i;
		383
		384	for (i = 0; i < fdchangecnt; ++i)
		385	{
		386	int fd = fdchanges [i];
		387	ANFD *anfd = anfds + fd;
		388	struct ev_io *w;
		389
		390	int events = 0;
		391
		392	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		393	events |= w->events;
		394
		395	anfd->reify = 0;
		396
		397	method_modify (EV_A_ fd, anfd->events, events);
		398	anfd->events = events;
		399	}
		400
		401	fdchangecnt = 0;
		402	}
		403
		404	static void
		405	fd_change (EV_P_ int fd)
		406	{
		407	if (anfds [fd].reify)
		408	return;
		409
		410	anfds [fd].reify = 1;
		411
		412	++fdchangecnt;
		413	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		414	fdchanges [fdchangecnt - 1] = fd;
		415	}
		416
		417	static void
		418	fd_kill (EV_P_ int fd)
		419	{
		420	struct ev_io *w;
		421
		422	while ((w = (struct ev_io *)anfds [fd].head))
		423	{
		424	ev_io_stop (EV_A_ w);
		425	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		426	}
		427	}
		428
		429	static int
		430	fd_valid (int fd)
		431	{
		432	#ifdef WIN32
		433	return !!win32_get_osfhandle (fd);
		434	#else
		435	return fcntl (fd, F_GETFD) != -1;
		436	#endif
		437	}
		438
		439	/* called on EBADF to verify fds */
		440	static void
		441	fd_ebadf (EV_P)
		442	{
		443	int fd;
		444
		445	for (fd = 0; fd < anfdmax; ++fd)
		446	if (anfds [fd].events)
		447	if (!fd_valid (fd) == -1 && errno == EBADF)
		448	fd_kill (EV_A_ fd);
		449	}
		450
		451	/* called on ENOMEM in select/poll to kill some fds and retry */
		452	static void
		453	fd_enomem (EV_P)
		454	{
		455	int fd;
		456
		457	for (fd = anfdmax; fd--; )
		458	if (anfds [fd].events)
		459	{
		460	fd_kill (EV_A_ fd);
		461	return;
131	}	462	}
132	}	463	}
133		464
134	static struct ev_timer **timers;	465	/* usually called after fork if method needs to re-arm all fds from scratch */
135	static int timermax, timercnt;
136
137	static void	466	static void
138	upheap (int k)	467	fd_rearm_all (EV_P)
139	{	468	{
140	struct ev_timer *w = timers [k];	469	int fd;
141		470
		471	/* this should be highly optimised to not do anything but set a flag */
		472	for (fd = 0; fd < anfdmax; ++fd)
		473	if (anfds [fd].events)
		474	{
		475	anfds [fd].events = 0;
		476	fd_change (EV_A_ fd);
		477	}
		478	}
		479
		480	/*****************************************************************************/
		481
		482	static void
		483	upheap (WT *heap, int k)
		484	{
		485	WT w = heap [k];
		486
142	while (k && timers [k >> 1]->at > w->at)	487	while (k && heap [k >> 1]->at > w->at)
143	{	488	{
144	timers [k] = timers [k >> 1];	489	heap [k] = heap [k >> 1];
145	timers [k]->active = k + 1;	490	((W)heap [k])->active = k + 1;
146	k >>= 1;	491	k >>= 1;
147	}	492	}
148		493
149	timers [k] = w;	494	heap [k] = w;
150	timers [k]->active = k + 1;	495	((W)heap [k])->active = k + 1;
151		496
152	}	497	}
153		498
154	static void	499	static void
155	downheap (int k)	500	downheap (WT *heap, int N, int k)
156	{	501	{
157	struct ev_timer *w = timers [k];	502	WT w = heap [k];
158		503
159	while (k < (timercnt >> 1))	504	while (k < (N >> 1))
160	{	505	{
161	int j = k << 1;	506	int j = k << 1;
162		507
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	508	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
164	++j;	509	++j;
165		510
166	if (w->at <= timers [j]->at)	511	if (w->at <= heap [j]->at)
167	break;	512	break;
168		513
169	timers [k] = timers [j];	514	heap [k] = heap [j];
170	timers [k]->active = k + 1;	515	((W)heap [k])->active = k + 1;
171	k = j;	516	k = j;
172	}	517	}
173		518
174	timers [k] = w;	519	heap [k] = w;
175	timers [k]->active = k + 1;	520	((W)heap [k])->active = k + 1;
176	}	521	}
177		522
178	static struct ev_signal **signals;	523	inline void
		524	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		525	{
		526	ev_tstamp old_at = heap [k]->at;
		527	heap [k]->at = at;
		528
		529	if (old_at < at)
		530	downheap (heap, N, k);
		531	else
		532	upheap (heap, k);
		533	}
		534
		535	/*****************************************************************************/
		536
		537	typedef struct
		538	{
		539	WL head;
		540	sig_atomic_t volatile gotsig;
		541	} ANSIG;
		542
		543	static ANSIG *signals;
179	static int signalmax, signalcnt;	544	static int signalmax;
180		545
		546	static int sigpipe [2];
		547	static sig_atomic_t volatile gotsig;
		548	static struct ev_io sigev;
		549
181	static void	550	static void
182	signals_init (struct ev_signal **base, int count)	551	signals_init (ANSIG *base, int count)
183	{	552	{
184	while (count--)	553	while (count--)
185	*base++ = 0;	554	{
186	}	555	base->head = 0;
		556	base->gotsig = 0;
187		557
		558	++base;
		559	}
		560	}
		561
		562	static void
		563	sighandler (int signum)
		564	{
		565	#if WIN32
		566	signal (signum, sighandler);
		567	#endif
		568
		569	signals [signum - 1].gotsig = 1;
		570
		571	if (!gotsig)
		572	{
		573	int old_errno = errno;
		574	gotsig = 1;
		575	#ifdef WIN32
		576	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		577	#else
		578	write (sigpipe [1], &signum, 1);
		579	#endif
		580	errno = old_errno;
		581	}
		582	}
		583
		584	void
		585	ev_feed_signal_event (EV_P_ int signum)
		586	{
		587	WL w;
		588
		589	#if EV_MULTIPLICITY
		590	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		591	#endif
		592
		593	--signum;
		594
		595	if (signum < 0 || signum >= signalmax)
		596	return;
		597
		598	signals [signum].gotsig = 0;
		599
		600	for (w = signals [signum].head; w; w = w->next)
		601	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		602	}
		603
		604	static void
		605	sigcb (EV_P_ struct ev_io *iow, int revents)
		606	{
		607	int signum;
		608
		609	#ifdef WIN32
		610	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		611	#else
		612	read (sigpipe [0], &revents, 1);
		613	#endif
		614	gotsig = 0;
		615
		616	for (signum = signalmax; signum--; )
		617	if (signals [signum].gotsig)
		618	ev_feed_signal_event (EV_A_ signum + 1);
		619	}
		620
		621	static void
		622	siginit (EV_P)
		623	{
		624	#ifndef WIN32
		625	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		626	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		627
		628	/* rather than sort out wether we really need nb, set it */
		629	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		630	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		631	#endif
		632
		633	ev_io_set (&sigev, sigpipe [0], EV_READ);
		634	ev_io_start (EV_A_ &sigev);
		635	ev_unref (EV_A); /* child watcher should not keep loop alive */
		636	}
		637
		638	/*****************************************************************************/
		639
		640	static struct ev_child *childs [PID_HASHSIZE];
		641
		642	#ifndef WIN32
		643
		644	static struct ev_signal childev;
		645
		646	#ifndef WCONTINUED
		647	# define WCONTINUED 0
		648	#endif
		649
		650	static void
		651	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		652	{
		653	struct ev_child *w;
		654
		655	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		656	if (w->pid == pid || !w->pid)
		657	{
		658	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		659	w->rpid = pid;
		660	w->rstatus = status;
		661	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		662	}
		663	}
		664
		665	static void
		666	childcb (EV_P_ struct ev_signal *sw, int revents)
		667	{
		668	int pid, status;
		669
		670	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		671	{
		672	/* make sure we are called again until all childs have been reaped */
		673	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		674
		675	child_reap (EV_A_ sw, pid, pid, status);
		676	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		677	}
		678	}
		679
		680	#endif
		681
		682	/*****************************************************************************/
		683
		684	#if EV_USE_KQUEUE
		685	# include "ev_kqueue.c"
		686	#endif
188	#if HAVE_EPOLL	687	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	688	# include "ev_epoll.c"
190	#endif	689	#endif
		690	#if EV_USE_POLL
		691	# include "ev_poll.c"
		692	#endif
191	#if HAVE_SELECT	693	#if EV_USE_SELECT
192	# include "ev_select.c"	694	# include "ev_select.c"
193	#endif	695	#endif
194		696
195	int ev_init (int flags)	697	int
		698	ev_version_major (void)
196	{	699	{
		700	return EV_VERSION_MAJOR;
		701	}
		702
		703	int
		704	ev_version_minor (void)
		705	{
		706	return EV_VERSION_MINOR;
		707	}
		708
		709	/* return true if we are running with elevated privileges and should ignore env variables */
		710	static int
		711	enable_secure (void)
		712	{
		713	#ifdef WIN32
		714	return 0;
		715	#else
		716	return getuid () != geteuid ()
		717	|| getgid () != getegid ();
		718	#endif
		719	}
		720
		721	int
		722	ev_method (EV_P)
		723	{
		724	return method;
		725	}
		726
		727	static void
		728	loop_init (EV_P_ int methods)
		729	{
		730	if (!method)
		731	{
197	#if HAVE_MONOTONIC	732	#if EV_USE_MONOTONIC
198	{	733	{
199	struct timespec ts;	734	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	735	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	736	have_monotonic = 1;
202	}	737	}
203	#endif	738	#endif
204		739
205	ev_now = ev_time ();	740	rt_now = ev_time ();
		741	mn_now = get_clock ();
		742	now_floor = mn_now;
		743	rtmn_diff = rt_now - mn_now;
206		744
		745	if (methods == EVMETHOD_AUTO)
		746	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		747	methods = atoi (getenv ("LIBEV_METHODS"));
		748	else
		749	methods = EVMETHOD_ANY;
		750
		751	method = 0;
		752	#if EV_USE_WIN32
		753	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		754	#endif
		755	#if EV_USE_KQUEUE
		756	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		757	#endif
207	#if HAVE_EPOLL	758	#if EV_USE_EPOLL
208	if (epoll_init (flags))	759	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
209	return ev_method;
210	#endif	760	#endif
		761	#if EV_USE_POLL
		762	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		763	#endif
211	#if HAVE_SELECT	764	#if EV_USE_SELECT
212	if (select_init (flags))	765	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
213	return ev_method;
214	#endif	766	#endif
215		767
216	ev_method = EVMETHOD_NONE;	768	ev_init (&sigev, sigcb);
217	return ev_method;	769	ev_set_priority (&sigev, EV_MAXPRI);
		770	}
218	}	771	}
219		772
220	void ev_prefork (void)	773	void
221	{	774	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	{	775	{
238	int i;	776	int i;
239		777
240	for (i = 0; i < pendingcnt; ++i)	778	#if EV_USE_WIN32
		779	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		780	#endif
		781	#if EV_USE_KQUEUE
		782	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		783	#endif
		784	#if EV_USE_EPOLL
		785	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		786	#endif
		787	#if EV_USE_POLL
		788	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		789	#endif
		790	#if EV_USE_SELECT
		791	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		792	#endif
		793
		794	for (i = NUMPRI; i--; )
		795	array_free (pending, [i]);
		796
		797	/* have to use the microsoft-never-gets-it-right macro */
		798	array_free_microshit (fdchange);
		799	array_free_microshit (timer);
		800	array_free_microshit (periodic);
		801	array_free_microshit (idle);
		802	array_free_microshit (prepare);
		803	array_free_microshit (check);
		804
		805	method = 0;
		806	}
		807
		808	static void
		809	loop_fork (EV_P)
		810	{
		811	#if EV_USE_EPOLL
		812	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		813	#endif
		814	#if EV_USE_KQUEUE
		815	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		816	#endif
		817
		818	if (ev_is_active (&sigev))
		819	{
		820	/* default loop */
		821
		822	ev_ref (EV_A);
		823	ev_io_stop (EV_A_ &sigev);
		824	close (sigpipe [0]);
		825	close (sigpipe [1]);
		826
		827	while (pipe (sigpipe))
		828	syserr ("(libev) error creating pipe");
		829
		830	siginit (EV_A);
241	{	831	}
242	ANPENDING *p = pendings + i;
243		832
244	if (p->w)	833	postfork = 0;
		834	}
		835
		836	#if EV_MULTIPLICITY
		837	struct ev_loop *
		838	ev_loop_new (int methods)
		839	{
		840	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		841
		842	memset (loop, 0, sizeof (struct ev_loop));
		843
		844	loop_init (EV_A_ methods);
		845
		846	if (ev_method (EV_A))
		847	return loop;
		848
		849	return 0;
		850	}
		851
		852	void
		853	ev_loop_destroy (EV_P)
		854	{
		855	loop_destroy (EV_A);
		856	ev_free (loop);
		857	}
		858
		859	void
		860	ev_loop_fork (EV_P)
		861	{
		862	postfork = 1;
		863	}
		864
		865	#endif
		866
		867	#if EV_MULTIPLICITY
		868	struct ev_loop *
		869	#else
		870	int
		871	#endif
		872	ev_default_loop (int methods)
		873	{
		874	if (sigpipe [0] == sigpipe [1])
		875	if (pipe (sigpipe))
		876	return 0;
		877
		878	if (!default_loop)
		879	{
		880	#if EV_MULTIPLICITY
		881	struct ev_loop *loop = default_loop = &default_loop_struct;
		882	#else
		883	default_loop = 1;
		884	#endif
		885
		886	loop_init (EV_A_ methods);
		887
		888	if (ev_method (EV_A))
245	{	889	{
246	p->w->pending = 0;	890	siginit (EV_A);
247	p->w->cb (p->w, p->events);	891
		892	#ifndef WIN32
		893	ev_signal_init (&childev, childcb, SIGCHLD);
		894	ev_set_priority (&childev, EV_MAXPRI);
		895	ev_signal_start (EV_A_ &childev);
		896	ev_unref (EV_A); /* child watcher should not keep loop alive */
		897	#endif
248	}	898	}
		899	else
		900	default_loop = 0;
		901	}
		902
		903	return default_loop;
		904	}
		905
		906	void
		907	ev_default_destroy (void)
		908	{
		909	#if EV_MULTIPLICITY
		910	struct ev_loop *loop = default_loop;
		911	#endif
		912
		913	#ifndef WIN32
		914	ev_ref (EV_A); /* child watcher */
		915	ev_signal_stop (EV_A_ &childev);
		916	#endif
		917
		918	ev_ref (EV_A); /* signal watcher */
		919	ev_io_stop (EV_A_ &sigev);
		920
		921	close (sigpipe [0]); sigpipe [0] = 0;
		922	close (sigpipe [1]); sigpipe [1] = 0;
		923
		924	loop_destroy (EV_A);
		925	}
		926
		927	void
		928	ev_default_fork (void)
		929	{
		930	#if EV_MULTIPLICITY
		931	struct ev_loop *loop = default_loop;
		932	#endif
		933
		934	if (method)
		935	postfork = 1;
		936	}
		937
		938	/*****************************************************************************/
		939
		940	static int
		941	any_pending (EV_P)
		942	{
		943	int pri;
		944
		945	for (pri = NUMPRI; pri--; )
		946	if (pendingcnt [pri])
		947	return 1;
		948
		949	return 0;
		950	}
		951
		952	static void
		953	call_pending (EV_P)
		954	{
		955	int pri;
		956
		957	for (pri = NUMPRI; pri--; )
		958	while (pendingcnt [pri])
		959	{
		960	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		961
		962	if (p->w)
		963	{
		964	p->w->pending = 0;
		965	EV_CB_INVOKE (p->w, p->events);
		966	}
249	}	967	}
250
251	pendingcnt = 0;
252	}	968	}
253		969
254	static void	970	static void
255	timer_reify (void)	971	timers_reify (EV_P)
256	{	972	{
257	while (timercnt && timers [0]->at <= ev_now)	973	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	974	{
259	struct ev_timer *w = timers [0];	975	struct ev_timer *w = timers [0];
260		976
		977	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		978
261	/* first reschedule timer */	979	/* first reschedule or stop timer */
262	if (w->repeat)	980	if (w->repeat)
263	{	981	{
264	if (w->is_abs)	982	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;	983	((WT)w)->at = mn_now + w->repeat;
268		984	downheap ((WT *)timers, timercnt, 0);
269	downheap (0);
270	}	985	}
271	else	986	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	987	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		988
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	989	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		990	}
		991	}
		992
		993	static void
		994	periodics_reify (EV_P)
		995	{
		996	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
275	}	997	{
276	}	998	struct ev_periodic *w = periodics [0];
277		999
278	int ev_loop_done;	1000	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
279		1001
		1002	/* first reschedule or stop timer */
		1003	if (w->reschedule_cb)
		1004	{
		1005	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, rt_now + 0.0001);
		1006
		1007	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > rt_now));
		1008	downheap ((WT *)periodics, periodiccnt, 0);
		1009	}
		1010	else if (w->interval)
		1011	{
		1012	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1013	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		1014	downheap ((WT *)periodics, periodiccnt, 0);
		1015	}
		1016	else
		1017	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1018
		1019	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1020	}
		1021	}
		1022
		1023	static void
		1024	periodics_reschedule (EV_P)
		1025	{
		1026	int i;
		1027
		1028	/* adjust periodics after time jump */
		1029	for (i = 0; i < periodiccnt; ++i)
		1030	{
		1031	struct ev_periodic *w = periodics [i];
		1032
		1033	if (w->reschedule_cb)
		1034	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1035	else if (w->interval)
		1036	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1037	}
		1038
		1039	/* now rebuild the heap */
		1040	for (i = periodiccnt >> 1; i--; )
		1041	downheap ((WT *)periodics, periodiccnt, i);
		1042	}
		1043
		1044	inline int
		1045	time_update_monotonic (EV_P)
		1046	{
		1047	mn_now = get_clock ();
		1048
		1049	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1050	{
		1051	rt_now = rtmn_diff + mn_now;
		1052	return 0;
		1053	}
		1054	else
		1055	{
		1056	now_floor = mn_now;
		1057	rt_now = ev_time ();
		1058	return 1;
		1059	}
		1060	}
		1061
		1062	static void
		1063	time_update (EV_P)
		1064	{
		1065	int i;
		1066
		1067	#if EV_USE_MONOTONIC
		1068	if (expect_true (have_monotonic))
		1069	{
		1070	if (time_update_monotonic (EV_A))
		1071	{
		1072	ev_tstamp odiff = rtmn_diff;
		1073
		1074	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1075	{
		1076	rtmn_diff = rt_now - mn_now;
		1077
		1078	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1079	return; /* all is well */
		1080
		1081	rt_now = ev_time ();
		1082	mn_now = get_clock ();
		1083	now_floor = mn_now;
		1084	}
		1085
		1086	periodics_reschedule (EV_A);
		1087	/* no timer adjustment, as the monotonic clock doesn't jump */
		1088	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1089	}
		1090	}
		1091	else
		1092	#endif
		1093	{
		1094	rt_now = ev_time ();
		1095
		1096	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1097	{
		1098	periodics_reschedule (EV_A);
		1099
		1100	/* adjust timers. this is easy, as the offset is the same for all */
		1101	for (i = 0; i < timercnt; ++i)
		1102	((WT)timers [i])->at += rt_now - mn_now;
		1103	}
		1104
		1105	mn_now = rt_now;
		1106	}
		1107	}
		1108
		1109	void
		1110	ev_ref (EV_P)
		1111	{
		1112	++activecnt;
		1113	}
		1114
		1115	void
		1116	ev_unref (EV_P)
		1117	{
		1118	--activecnt;
		1119	}
		1120
		1121	static int loop_done;
		1122
		1123	void
280	int ev_loop (int flags)	1124	ev_loop (EV_P_ int flags)
281	{	1125	{
282	double block;	1126	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	1127	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
284		1128
285	do	1129	do
286	{	1130	{
		1131	/* queue check watchers (and execute them) */
		1132	if (expect_false (preparecnt))
		1133	{
		1134	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1135	call_pending (EV_A);
		1136	}
		1137
		1138	/* we might have forked, so reify kernel state if necessary */
		1139	if (expect_false (postfork))
		1140	loop_fork (EV_A);
		1141
287	/* update fd-related kernel structures */	1142	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1143	fd_reify (EV_A);
289		1144
290	/* calculate blocking time */	1145	/* calculate blocking time */
		1146
		1147	/* we only need this for !monotonic clock or timers, but as we basically
		1148	always have timers, we just calculate it always */
		1149	#if EV_USE_MONOTONIC
		1150	if (expect_true (have_monotonic))
		1151	time_update_monotonic (EV_A);
		1152	else
		1153	#endif
		1154	{
291	ev_now = ev_time ();	1155	rt_now = ev_time ();
		1156	mn_now = rt_now;
		1157	}
292		1158
293	if (flags & EVLOOP_NONBLOCK)	1159	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	1160	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	1161	else
298	{	1162	{
		1163	block = MAX_BLOCKTIME;
		1164
		1165	if (timercnt)
		1166	{
299	block = timers [0]->at - ev_now + method_fudge;	1167	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
		1168	if (block > to) block = to;
		1169	}
		1170
		1171	if (periodiccnt)
		1172	{
		1173	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
		1174	if (block > to) block = to;
		1175	}
		1176
300	if (block < 0.) block = 0.;	1177	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1178	}
303		1179
304	method_poll (block);	1180	method_poll (EV_A_ block);
305		1181
		1182	/* update rt_now, do magic */
		1183	time_update (EV_A);
		1184
306	/* put pending timers into pendign queue and reschedule them */	1185	/* queue pending timers and reschedule them */
307	timer_reify ();	1186	timers_reify (EV_A); /* relative timers called last */
		1187	periodics_reify (EV_A); /* absolute timers called first */
308		1188
309	ev_now = ev_time ();	1189	/* queue idle watchers unless io or timers are pending */
		1190	if (idlecnt && !any_pending (EV_A))
		1191	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1192
		1193	/* queue check watchers, to be executed first */
		1194	if (checkcnt)
		1195	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1196
310	call_pending ();	1197	call_pending (EV_A);
311	}	1198	}
312	while (!ev_loop_done);	1199	while (activecnt && !loop_done);
313	}
314		1200
315	static void	1201	if (loop_done != 2)
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1202	loop_done = 0;
		1203	}
		1204
		1205	void
		1206	ev_unloop (EV_P_ int how)
		1207	{
		1208	loop_done = how;
		1209	}
		1210
		1211	/*****************************************************************************/
		1212
		1213	inline void
		1214	wlist_add (WL *head, WL elem)
317	{	1215	{
318	elem->next = *head;	1216	elem->next = *head;
319	*head = elem;	1217	*head = elem;
320	}	1218	}
321		1219
322	static void	1220	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1221	wlist_del (WL *head, WL elem)
324	{	1222	{
325	while (*head)	1223	while (*head)
326	{	1224	{
327	if (*head == elem)	1225	if (*head == elem)
328	{	1226	{
…		…
332		1230
333	head = &(*head)->next;	1231	head = &(*head)->next;
334	}	1232	}
335	}	1233	}
336		1234
337	static void	1235	inline void
338	ev_start (struct ev_watcher *w, int active)	1236	ev_clear_pending (EV_P_ W w)
339	{	1237	{
		1238	if (w->pending)
		1239	{
		1240	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	1241	w->pending = 0;
		1242	}
		1243	}
		1244
		1245	inline void
		1246	ev_start (EV_P_ W w, int active)
		1247	{
		1248	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1249	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1250
341	w->active = active;	1251	w->active = active;
		1252	ev_ref (EV_A);
342	}	1253	}
343		1254
344	static void	1255	inline void
345	ev_stop (struct ev_watcher *w)	1256	ev_stop (EV_P_ W w)
346	{	1257	{
347	if (w->pending)	1258	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	1259	w->active = 0;
351	/* nop */
352	}	1260	}
353		1261
		1262	/*****************************************************************************/
		1263
354	void	1264	void
355	evio_start (struct ev_io *w)	1265	ev_io_start (EV_P_ struct ev_io *w)
356	{	1266	{
		1267	int fd = w->fd;
		1268
357	if (ev_is_active (w))	1269	if (ev_is_active (w))
358	return;	1270	return;
359		1271
360	int fd = w->fd;	1272	assert (("ev_io_start called with negative fd", fd >= 0));
361		1273
362	ev_start ((struct ev_watcher *)w, 1);	1274	ev_start (EV_A_ (W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1275	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1276	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		1277
366	++fdchangecnt;	1278	fd_change (EV_A_ fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	1279	}
370		1280
371	void	1281	void
372	evio_stop (struct ev_io *w)	1282	ev_io_stop (EV_P_ struct ev_io *w)
373	{	1283	{
		1284	ev_clear_pending (EV_A_ (W)w);
374	if (!ev_is_active (w))	1285	if (!ev_is_active (w))
375	return;	1286	return;
376		1287
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1288	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	1289	ev_stop (EV_A_ (W)w);
379		1290
380	++fdchangecnt;	1291	fd_change (EV_A_ w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	1292	}
384		1293
385	void	1294	void
386	evtimer_start (struct ev_timer *w)	1295	ev_timer_start (EV_P_ struct ev_timer *w)
387	{	1296	{
388	if (ev_is_active (w))	1297	if (ev_is_active (w))
389	return;	1298	return;
390		1299
391	if (w->is_abs)	1300	((WT)w)->at += mn_now;
		1301
		1302	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1303
		1304	ev_start (EV_A_ (W)w, ++timercnt);
		1305	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1306	timers [timercnt - 1] = w;
		1307	upheap ((WT *)timers, timercnt - 1);
		1308
		1309	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1310	}
		1311
		1312	void
		1313	ev_timer_stop (EV_P_ struct ev_timer *w)
		1314	{
		1315	ev_clear_pending (EV_A_ (W)w);
		1316	if (!ev_is_active (w))
		1317	return;
		1318
		1319	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1320
		1321	if (((W)w)->active < timercnt--)
		1322	{
		1323	timers [((W)w)->active - 1] = timers [timercnt];
		1324	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
392	{	1325	}
393	/* this formula differs from the one in timer_reify becuse we do not round up */	1326
		1327	((WT)w)->at = w->repeat;
		1328
		1329	ev_stop (EV_A_ (W)w);
		1330	}
		1331
		1332	void
		1333	ev_timer_again (EV_P_ struct ev_timer *w)
		1334	{
		1335	if (ev_is_active (w))
		1336	{
394	if (w->repeat)	1337	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1338	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
		1339	else
		1340	ev_timer_stop (EV_A_ w);
		1341	}
		1342	else if (w->repeat)
		1343	ev_timer_start (EV_A_ w);
		1344	}
		1345
		1346	void
		1347	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1348	{
		1349	if (ev_is_active (w))
		1350	return;
		1351
		1352	if (w->reschedule_cb)
		1353	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1354	else if (w->interval)
396	}	1355	{
		1356	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1357	/* this formula differs from the one in periodic_reify because we do not always round up */
		1358	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1359	}
		1360
		1361	ev_start (EV_A_ (W)w, ++periodiccnt);
		1362	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1363	periodics [periodiccnt - 1] = w;
		1364	upheap ((WT *)periodics, periodiccnt - 1);
		1365
		1366	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1367	}
		1368
		1369	void
		1370	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1371	{
		1372	ev_clear_pending (EV_A_ (W)w);
		1373	if (!ev_is_active (w))
		1374	return;
		1375
		1376	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1377
		1378	if (((W)w)->active < periodiccnt--)
		1379	{
		1380	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1381	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1382	}
		1383
		1384	ev_stop (EV_A_ (W)w);
		1385	}
		1386
		1387	void
		1388	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1389	{
		1390	/* TODO: use adjustheap and recalculation */
		1391	ev_periodic_stop (EV_A_ w);
		1392	ev_periodic_start (EV_A_ w);
		1393	}
		1394
		1395	void
		1396	ev_idle_start (EV_P_ struct ev_idle *w)
		1397	{
		1398	if (ev_is_active (w))
		1399	return;
		1400
		1401	ev_start (EV_A_ (W)w, ++idlecnt);
		1402	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1403	idles [idlecnt - 1] = w;
		1404	}
		1405
		1406	void
		1407	ev_idle_stop (EV_P_ struct ev_idle *w)
		1408	{
		1409	ev_clear_pending (EV_A_ (W)w);
		1410	if (ev_is_active (w))
		1411	return;
		1412
		1413	idles [((W)w)->active - 1] = idles [--idlecnt];
		1414	ev_stop (EV_A_ (W)w);
		1415	}
		1416
		1417	void
		1418	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1419	{
		1420	if (ev_is_active (w))
		1421	return;
		1422
		1423	ev_start (EV_A_ (W)w, ++preparecnt);
		1424	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1425	prepares [preparecnt - 1] = w;
		1426	}
		1427
		1428	void
		1429	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1430	{
		1431	ev_clear_pending (EV_A_ (W)w);
		1432	if (ev_is_active (w))
		1433	return;
		1434
		1435	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1436	ev_stop (EV_A_ (W)w);
		1437	}
		1438
		1439	void
		1440	ev_check_start (EV_P_ struct ev_check *w)
		1441	{
		1442	if (ev_is_active (w))
		1443	return;
		1444
		1445	ev_start (EV_A_ (W)w, ++checkcnt);
		1446	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1447	checks [checkcnt - 1] = w;
		1448	}
		1449
		1450	void
		1451	ev_check_stop (EV_P_ struct ev_check *w)
		1452	{
		1453	ev_clear_pending (EV_A_ (W)w);
		1454	if (ev_is_active (w))
		1455	return;
		1456
		1457	checks [((W)w)->active - 1] = checks [--checkcnt];
		1458	ev_stop (EV_A_ (W)w);
		1459	}
		1460
		1461	#ifndef SA_RESTART
		1462	# define SA_RESTART 0
		1463	#endif
		1464
		1465	void
		1466	ev_signal_start (EV_P_ struct ev_signal *w)
		1467	{
		1468	#if EV_MULTIPLICITY
		1469	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1470	#endif
		1471	if (ev_is_active (w))
		1472	return;
		1473
		1474	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1475
		1476	ev_start (EV_A_ (W)w, 1);
		1477	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1478	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1479
		1480	if (!((WL)w)->next)
		1481	{
		1482	#if WIN32
		1483	signal (w->signum, sighandler);
		1484	#else
		1485	struct sigaction sa;
		1486	sa.sa_handler = sighandler;
		1487	sigfillset (&sa.sa_mask);
		1488	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1489	sigaction (w->signum, &sa, 0);
		1490	#endif
		1491	}
		1492	}
		1493
		1494	void
		1495	ev_signal_stop (EV_P_ struct ev_signal *w)
		1496	{
		1497	ev_clear_pending (EV_A_ (W)w);
		1498	if (!ev_is_active (w))
		1499	return;
		1500
		1501	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1502	ev_stop (EV_A_ (W)w);
		1503
		1504	if (!signals [w->signum - 1].head)
		1505	signal (w->signum, SIG_DFL);
		1506	}
		1507
		1508	void
		1509	ev_child_start (EV_P_ struct ev_child *w)
		1510	{
		1511	#if EV_MULTIPLICITY
		1512	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1513	#endif
		1514	if (ev_is_active (w))
		1515	return;
		1516
		1517	ev_start (EV_A_ (W)w, 1);
		1518	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1519	}
		1520
		1521	void
		1522	ev_child_stop (EV_P_ struct ev_child *w)
		1523	{
		1524	ev_clear_pending (EV_A_ (W)w);
		1525	if (ev_is_active (w))
		1526	return;
		1527
		1528	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1529	ev_stop (EV_A_ (W)w);
		1530	}
		1531
		1532	/*****************************************************************************/
		1533
		1534	struct ev_once
		1535	{
		1536	struct ev_io io;
		1537	struct ev_timer to;
		1538	void (*cb)(int revents, void *arg);
		1539	void *arg;
		1540	};
		1541
		1542	static void
		1543	once_cb (EV_P_ struct ev_once *once, int revents)
		1544	{
		1545	void (*cb)(int revents, void *arg) = once->cb;
		1546	void *arg = once->arg;
		1547
		1548	ev_io_stop (EV_A_ &once->io);
		1549	ev_timer_stop (EV_A_ &once->to);
		1550	ev_free (once);
		1551
		1552	cb (revents, arg);
		1553	}
		1554
		1555	static void
		1556	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1557	{
		1558	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1559	}
		1560
		1561	static void
		1562	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1563	{
		1564	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1565	}
		1566
		1567	void
		1568	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1569	{
		1570	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1571
		1572	if (!once)
		1573	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
397	else	1574	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	}	1575	{
		1576	once->cb = cb;
		1577	once->arg = arg;
417		1578
418	ev_stop ((struct ev_watcher *)w);	1579	ev_init (&once->io, once_cb_io);
419	}	1580	if (fd >= 0)
		1581	{
		1582	ev_io_set (&once->io, fd, events);
		1583	ev_io_start (EV_A_ &once->io);
		1584	}
420		1585
421	void	1586	ev_init (&once->to, once_cb_to);
422	evsignal_start (struct ev_signal *w)	1587	if (timeout >= 0.)
423	{	1588	{
424	if (ev_is_active (w))	1589	ev_timer_set (&once->to, timeout, 0.);
425	return;	1590	ev_timer_start (EV_A_ &once->to);
426		1591	}
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	{	1592	}
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	}	1593	}
484		1594
485	#endif
486
487
488
489

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