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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 1.115 by root, Wed Nov 14 04:53:21 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
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# include "config.h"
		38
		39	# if HAVE_CLOCK_GETTIME
		40	# ifndef EV_USE_MONOTONIC
		41	# define EV_USE_MONOTONIC 1
		42	# endif
		43	# ifndef EV_USE_REALTIME
		44	# define EV_USE_REALTIME 1
		45	# endif
		46	# endif
		47
		48	# if HAVE_SELECT && HAVE_SYS_SELECT_H && !defined (EV_USE_SELECT)
		49	# define EV_USE_SELECT 1
		50	# endif
		51
		52	# if HAVE_POLL && HAVE_POLL_H && !defined (EV_USE_POLL)
		53	# define EV_USE_POLL 1
		54	# endif
		55
		56	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H && !defined (EV_USE_EPOLL)
		57	# define EV_USE_EPOLL 1
		58	# endif
		59
		60	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H && !defined (EV_USE_KQUEUE)
		61	# define EV_USE_KQUEUE 1
		62	# endif
		63
		64	#endif
		65
1	#include <math.h>	66	#include <math.h>
2	#include <stdlib.h>	67	#include <stdlib.h>
		68	#include <fcntl.h>
		69	#include <stddef.h>
3		70
4	#include <stdio.h>	71	#include <stdio.h>
5		72
		73	#include <assert.h>
6	#include <errno.h>	74	#include <errno.h>
7	#include <sys/time.h>	75	#include <sys/types.h>
8	#include <time.h>	76	#include <time.h>
9		77
		78	#include <signal.h>
		79
		80	#ifndef _WIN32
		81	# include <unistd.h>
		82	# include <sys/time.h>
		83	# include <sys/wait.h>
		84	#else
		85	# define WIN32_LEAN_AND_MEAN
		86	# include <windows.h>
		87	# ifndef EV_SELECT_IS_WINSOCKET
		88	# define EV_SELECT_IS_WINSOCKET 1
		89	# endif
		90	#endif
		91
		92	/**/
		93
		94	#ifndef EV_USE_MONOTONIC
		95	# define EV_USE_MONOTONIC 1
		96	#endif
		97
		98	#ifndef EV_USE_SELECT
		99	# define EV_USE_SELECT 1
		100	# define EV_SELECT_USE_FD_SET 1
		101	#endif
		102
		103	#ifndef EV_USE_POLL
		104	# ifdef _WIN32
		105	# define EV_USE_POLL 0
		106	# else
		107	# define EV_USE_POLL 1
		108	# endif
		109	#endif
		110
		111	#ifndef EV_USE_EPOLL
		112	# define EV_USE_EPOLL 0
		113	#endif
		114
		115	#ifndef EV_USE_KQUEUE
		116	# define EV_USE_KQUEUE 0
		117	#endif
		118
		119	#ifndef EV_USE_REALTIME
		120	# define EV_USE_REALTIME 1
		121	#endif
		122
		123	/**/
		124
		125	/* darwin simply cannot be helped */
		126	#ifdef __APPLE__
		127	# undef EV_USE_POLL
		128	# undef EV_USE_KQUEUE
		129	#endif
		130
10	#ifdef CLOCK_MONOTONIC	131	#ifndef CLOCK_MONOTONIC
		132	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	133	# define EV_USE_MONOTONIC 0
12	#endif	134	#endif
13		135
14	#define HAVE_EPOLL 1	136	#ifndef CLOCK_REALTIME
		137	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	138	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	139	#endif
17		140
18	#define MAX_BLOCKTIME 60.	141	#if EV_SELECT_IS_WINSOCKET
		142	# include <winsock.h>
		143	#endif
19		144
		145	/**/
		146
		147	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		148	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		149	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		150	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
		151
		152	#ifdef EV_H
		153	# include EV_H
		154	#else
20	#include "ev.h"	155	# include "ev.h"
		156	#endif
21		157
		158	#if __GNUC__ >= 3
		159	# define expect(expr,value) __builtin_expect ((expr),(value))
		160	# define inline inline
		161	#else
		162	# define expect(expr,value) (expr)
		163	# define inline static
		164	#endif
		165
		166	#define expect_false(expr) expect ((expr) != 0, 0)
		167	#define expect_true(expr) expect ((expr) != 0, 1)
		168
		169	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		170	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		171
		172	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		173	#define EMPTY2(a,b) /* used to suppress some warnings */
		174
22	struct ev_watcher {	175	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	176	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	177	typedef struct ev_watcher_time *WT;
28	};
29		178
		179	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		180
		181	#ifdef _WIN32
		182	# include "ev_win32.c"
		183	#endif
		184
		185	/*****************************************************************************/
		186
		187	static void (*syserr_cb)(const char *msg);
		188
		189	void ev_set_syserr_cb (void (*cb)(const char *msg))
		190	{
		191	syserr_cb = cb;
		192	}
		193
		194	static void
		195	syserr (const char *msg)
		196	{
		197	if (!msg)
		198	msg = "(libev) system error";
		199
		200	if (syserr_cb)
		201	syserr_cb (msg);
		202	else
		203	{
		204	perror (msg);
		205	abort ();
		206	}
		207	}
		208
		209	static void *(*alloc)(void *ptr, long size);
		210
		211	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		212	{
		213	alloc = cb;
		214	}
		215
		216	static void *
		217	ev_realloc (void *ptr, long size)
		218	{
		219	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		220
		221	if (!ptr && size)
		222	{
		223	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		224	abort ();
		225	}
		226
		227	return ptr;
		228	}
		229
		230	#define ev_malloc(size) ev_realloc (0, (size))
		231	#define ev_free(ptr) ev_realloc ((ptr), 0)
		232
		233	/*****************************************************************************/
		234
		235	typedef struct
		236	{
		237	WL head;
		238	unsigned char events;
		239	unsigned char reify;
		240	#if EV_SELECT_IS_WINSOCKET
		241	SOCKET handle;
		242	#endif
		243	} ANFD;
		244
		245	typedef struct
		246	{
		247	W w;
		248	int events;
		249	} ANPENDING;
		250
		251	#if EV_MULTIPLICITY
		252
		253	struct ev_loop
		254	{
		255	ev_tstamp ev_rt_now;
		256	#define ev_rt_now ((loop)->ev_rt_now)
		257	#define VAR(name,decl) decl;
		258	#include "ev_vars.h"
		259	#undef VAR
		260	};
		261	#include "ev_wrap.h"
		262
		263	struct ev_loop default_loop_struct;
		264	static struct ev_loop *default_loop;
		265
		266	#else
		267
30	ev_tstamp ev_now;	268	ev_tstamp ev_rt_now;
31	int ev_method;	269	#define VAR(name,decl) static decl;
		270	#include "ev_vars.h"
		271	#undef VAR
32		272
33	static int have_monotonic; /* runtime */	273	static int default_loop;
34		274
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	275	#endif
36	static void (*method_reify)(void);	276
37	static void (*method_poll)(ev_tstamp timeout);	277	/*****************************************************************************/
38		278
39	ev_tstamp	279	ev_tstamp
40	ev_time (void)	280	ev_time (void)
41	{	281	{
42	#if HAVE_REALTIME	282	#if EV_USE_REALTIME
43	struct timespec ts;	283	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	284	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	285	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	286	#else
47	struct timeval tv;	287	struct timeval tv;
48	gettimeofday (&tv, 0);	288	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	289	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	290	#endif
51	}	291	}
52		292
53	static ev_tstamp	293	inline ev_tstamp
54	get_clock (void)	294	get_clock (void)
55	{	295	{
56	#if HAVE_MONOTONIC	296	#if EV_USE_MONOTONIC
57	if (have_monotonic)	297	if (expect_true (have_monotonic))
58	{	298	{
59	struct timespec ts;	299	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	300	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	301	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	302	}
63	#endif	303	#endif
64		304
65	return ev_time ();	305	return ev_time ();
66	}	306	}
67		307
		308	#if EV_MULTIPLICITY
		309	ev_tstamp
		310	ev_now (EV_P)
		311	{
		312	return ev_rt_now;
		313	}
		314	#endif
		315
		316	#define array_roundsize(type,n) (((n) | 4) & ~3)
		317
68	#define array_needsize(base,cur,cnt,init) \	318	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	319	if (expect_false ((cnt) > cur)) \
70	{ \	320	{ \
71	int newcnt = cur ? cur << 1 : 16; \	321	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	322	do \
		323	{ \
		324	newcnt = array_roundsize (type, newcnt << 1); \
		325	} \
		326	while ((cnt) > newcnt); \
		327	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	328	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
74	init (base + cur, newcnt - cur); \	329	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	330	cur = newcnt; \
76	}	331	}
77		332
78	typedef struct	333	#define array_slim(type,stem) \
79	{	334	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
80	struct ev_io *head;	335	{ \
81	unsigned char wev, rev; /* want, received event set */	336	stem ## max = array_roundsize (stem ## cnt >> 1); \
82	} ANFD;	337	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		338	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		339	}
83		340
84	static ANFD *anfds;	341	#define array_free(stem, idx) \
85	static int anfdmax;	342	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
86		343
87	static int *fdchanges;	344	/*****************************************************************************/
88	static int fdchangemax, fdchangecnt;
89		345
90	static void	346	static void
91	anfds_init (ANFD *base, int count)	347	anfds_init (ANFD *base, int count)
92	{	348	{
93	while (count--)	349	while (count--)
94	{	350	{
95	base->head = 0;	351	base->head = 0;
96	base->wev = base->rev = EV_NONE;	352	base->events = EV_NONE;
		353	base->reify = 0;
		354
97	++base;	355	++base;
98	}	356	}
99	}	357	}
100		358
101	typedef struct	359	void
		360	ev_feed_event (EV_P_ void *w, int revents)
102	{	361	{
103	struct ev_watcher *w;	362	W w_ = (W)w;
104	int events;
105	} ANPENDING;
106		363
107	static ANPENDING *pendings;	364	if (w_->pending)
108	static int pendingmax, pendingcnt;	365	{
		366	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		367	return;
		368	}
109		369
110	static void
111	event (struct ev_watcher *w, int events)
112	{
113	w->pending = ++pendingcnt;	370	w_->pending = ++pendingcnt [ABSPRI (w_)];
114	array_needsize (pendings, pendingmax, pendingcnt, );	371	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
115	pendings [pendingcnt - 1].w = w;	372	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
116	pendings [pendingcnt - 1].events = events;	373	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
117	}	374	}
118		375
119	static void	376	static void
		377	queue_events (EV_P_ W *events, int eventcnt, int type)
		378	{
		379	int i;
		380
		381	for (i = 0; i < eventcnt; ++i)
		382	ev_feed_event (EV_A_ events [i], type);
		383	}
		384
		385	inline void
120	fd_event (int fd, int events)	386	fd_event (EV_P_ int fd, int revents)
121	{	387	{
122	ANFD *anfd = anfds + fd;	388	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	389	struct ev_io *w;
124		390
125	for (w = anfd->head; w; w = w->next)	391	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
126	{	392	{
127	int ev = w->events & events;	393	int ev = w->events & revents;
128		394
129	if (ev)	395	if (ev)
130	event ((struct ev_watcher *)w, ev);	396	ev_feed_event (EV_A_ (W)w, ev);
		397	}
		398	}
		399
		400	void
		401	ev_feed_fd_event (EV_P_ int fd, int revents)
		402	{
		403	fd_event (EV_A_ fd, revents);
		404	}
		405
		406	/*****************************************************************************/
		407
		408	static void
		409	fd_reify (EV_P)
		410	{
		411	int i;
		412
		413	for (i = 0; i < fdchangecnt; ++i)
		414	{
		415	int fd = fdchanges [i];
		416	ANFD *anfd = anfds + fd;
		417	struct ev_io *w;
		418
		419	int events = 0;
		420
		421	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		422	events |= w->events;
		423
		424	#if EV_SELECT_IS_WINSOCKET
		425	if (events)
		426	{
		427	unsigned long argp;
		428	anfd->handle = _get_osfhandle (fd);
		429	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		430	}
		431	#endif
		432
		433	anfd->reify = 0;
		434
		435	method_modify (EV_A_ fd, anfd->events, events);
		436	anfd->events = events;
		437	}
		438
		439	fdchangecnt = 0;
		440	}
		441
		442	static void
		443	fd_change (EV_P_ int fd)
		444	{
		445	if (anfds [fd].reify)
		446	return;
		447
		448	anfds [fd].reify = 1;
		449
		450	++fdchangecnt;
		451	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		452	fdchanges [fdchangecnt - 1] = fd;
		453	}
		454
		455	static void
		456	fd_kill (EV_P_ int fd)
		457	{
		458	struct ev_io *w;
		459
		460	while ((w = (struct ev_io *)anfds [fd].head))
		461	{
		462	ev_io_stop (EV_A_ w);
		463	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		464	}
		465	}
		466
		467	static int
		468	fd_valid (int fd)
		469	{
		470	#ifdef _WIN32
		471	return _get_osfhandle (fd) != -1;
		472	#else
		473	return fcntl (fd, F_GETFD) != -1;
		474	#endif
		475	}
		476
		477	/* called on EBADF to verify fds */
		478	static void
		479	fd_ebadf (EV_P)
		480	{
		481	int fd;
		482
		483	for (fd = 0; fd < anfdmax; ++fd)
		484	if (anfds [fd].events)
		485	if (!fd_valid (fd) == -1 && errno == EBADF)
		486	fd_kill (EV_A_ fd);
		487	}
		488
		489	/* called on ENOMEM in select/poll to kill some fds and retry */
		490	static void
		491	fd_enomem (EV_P)
		492	{
		493	int fd;
		494
		495	for (fd = anfdmax; fd--; )
		496	if (anfds [fd].events)
		497	{
		498	fd_kill (EV_A_ fd);
		499	return;
131	}	500	}
132	}	501	}
133		502
134	static struct ev_timer **timers;	503	/* usually called after fork if method needs to re-arm all fds from scratch */
135	static int timermax, timercnt;
136
137	static void	504	static void
138	upheap (int k)	505	fd_rearm_all (EV_P)
139	{	506	{
140	struct ev_timer *w = timers [k];	507	int fd;
141		508
		509	/* this should be highly optimised to not do anything but set a flag */
		510	for (fd = 0; fd < anfdmax; ++fd)
		511	if (anfds [fd].events)
		512	{
		513	anfds [fd].events = 0;
		514	fd_change (EV_A_ fd);
		515	}
		516	}
		517
		518	/*****************************************************************************/
		519
		520	static void
		521	upheap (WT *heap, int k)
		522	{
		523	WT w = heap [k];
		524
142	while (k && timers [k >> 1]->at > w->at)	525	while (k && heap [k >> 1]->at > w->at)
143	{	526	{
144	timers [k] = timers [k >> 1];	527	heap [k] = heap [k >> 1];
145	timers [k]->active = k + 1;	528	((W)heap [k])->active = k + 1;
146	k >>= 1;	529	k >>= 1;
147	}	530	}
148		531
149	timers [k] = w;	532	heap [k] = w;
150	timers [k]->active = k + 1;	533	((W)heap [k])->active = k + 1;
151		534
152	}	535	}
153		536
154	static void	537	static void
155	downheap (int k)	538	downheap (WT *heap, int N, int k)
156	{	539	{
157	struct ev_timer *w = timers [k];	540	WT w = heap [k];
158		541
159	while (k < (timercnt >> 1))	542	while (k < (N >> 1))
160	{	543	{
161	int j = k << 1;	544	int j = k << 1;
162		545
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	546	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
164	++j;	547	++j;
165		548
166	if (w->at <= timers [j]->at)	549	if (w->at <= heap [j]->at)
167	break;	550	break;
168		551
169	timers [k] = timers [j];	552	heap [k] = heap [j];
170	timers [k]->active = k + 1;	553	((W)heap [k])->active = k + 1;
171	k = j;	554	k = j;
172	}	555	}
173		556
174	timers [k] = w;	557	heap [k] = w;
175	timers [k]->active = k + 1;	558	((W)heap [k])->active = k + 1;
176	}	559	}
177		560
178	static struct ev_signal **signals;	561	inline void
		562	adjustheap (WT *heap, int N, int k)
		563	{
		564	upheap (heap, k);
		565	downheap (heap, N, k);
		566	}
		567
		568	/*****************************************************************************/
		569
		570	typedef struct
		571	{
		572	WL head;
		573	sig_atomic_t volatile gotsig;
		574	} ANSIG;
		575
		576	static ANSIG *signals;
179	static int signalmax, signalcnt;	577	static int signalmax;
180		578
		579	static int sigpipe [2];
		580	static sig_atomic_t volatile gotsig;
		581	static struct ev_io sigev;
		582
181	static void	583	static void
182	signals_init (struct ev_signal **base, int count)	584	signals_init (ANSIG *base, int count)
183	{	585	{
184	while (count--)	586	while (count--)
185	*base++ = 0;	587	{
186	}	588	base->head = 0;
		589	base->gotsig = 0;
187		590
		591	++base;
		592	}
		593	}
		594
		595	static void
		596	sighandler (int signum)
		597	{
		598	#if _WIN32
		599	signal (signum, sighandler);
		600	#endif
		601
		602	signals [signum - 1].gotsig = 1;
		603
		604	if (!gotsig)
		605	{
		606	int old_errno = errno;
		607	gotsig = 1;
		608	write (sigpipe [1], &signum, 1);
		609	errno = old_errno;
		610	}
		611	}
		612
		613	void
		614	ev_feed_signal_event (EV_P_ int signum)
		615	{
		616	WL w;
		617
		618	#if EV_MULTIPLICITY
		619	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		620	#endif
		621
		622	--signum;
		623
		624	if (signum < 0 || signum >= signalmax)
		625	return;
		626
		627	signals [signum].gotsig = 0;
		628
		629	for (w = signals [signum].head; w; w = w->next)
		630	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		631	}
		632
		633	static void
		634	sigcb (EV_P_ struct ev_io *iow, int revents)
		635	{
		636	int signum;
		637
		638	read (sigpipe [0], &revents, 1);
		639	gotsig = 0;
		640
		641	for (signum = signalmax; signum--; )
		642	if (signals [signum].gotsig)
		643	ev_feed_signal_event (EV_A_ signum + 1);
		644	}
		645
		646	inline void
		647	fd_intern (int fd)
		648	{
		649	#ifdef _WIN32
		650	int arg = 1;
		651	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		652	#else
		653	fcntl (fd, F_SETFD, FD_CLOEXEC);
		654	fcntl (fd, F_SETFL, O_NONBLOCK);
		655	#endif
		656	}
		657
		658	static void
		659	siginit (EV_P)
		660	{
		661	fd_intern (sigpipe [0]);
		662	fd_intern (sigpipe [1]);
		663
		664	ev_io_set (&sigev, sigpipe [0], EV_READ);
		665	ev_io_start (EV_A_ &sigev);
		666	ev_unref (EV_A); /* child watcher should not keep loop alive */
		667	}
		668
		669	/*****************************************************************************/
		670
		671	static struct ev_child *childs [PID_HASHSIZE];
		672
		673	#ifndef _WIN32
		674
		675	static struct ev_signal childev;
		676
		677	#ifndef WCONTINUED
		678	# define WCONTINUED 0
		679	#endif
		680
		681	static void
		682	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		683	{
		684	struct ev_child *w;
		685
		686	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		687	if (w->pid == pid || !w->pid)
		688	{
		689	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		690	w->rpid = pid;
		691	w->rstatus = status;
		692	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		693	}
		694	}
		695
		696	static void
		697	childcb (EV_P_ struct ev_signal *sw, int revents)
		698	{
		699	int pid, status;
		700
		701	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		702	{
		703	/* make sure we are called again until all childs have been reaped */
		704	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		705
		706	child_reap (EV_A_ sw, pid, pid, status);
		707	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		708	}
		709	}
		710
		711	#endif
		712
		713	/*****************************************************************************/
		714
		715	#if EV_USE_KQUEUE
		716	# include "ev_kqueue.c"
		717	#endif
188	#if HAVE_EPOLL	718	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	719	# include "ev_epoll.c"
190	#endif	720	#endif
		721	#if EV_USE_POLL
		722	# include "ev_poll.c"
		723	#endif
191	#if HAVE_SELECT	724	#if EV_USE_SELECT
192	# include "ev_select.c"	725	# include "ev_select.c"
193	#endif	726	#endif
194		727
195	int ev_init (int flags)	728	int
		729	ev_version_major (void)
196	{	730	{
		731	return EV_VERSION_MAJOR;
		732	}
		733
		734	int
		735	ev_version_minor (void)
		736	{
		737	return EV_VERSION_MINOR;
		738	}
		739
		740	/* return true if we are running with elevated privileges and should ignore env variables */
		741	static int
		742	enable_secure (void)
		743	{
		744	#ifdef _WIN32
		745	return 0;
		746	#else
		747	return getuid () != geteuid ()
		748	|| getgid () != getegid ();
		749	#endif
		750	}
		751
		752	unsigned int
		753	ev_method (EV_P)
		754	{
		755	return method;
		756	}
		757
		758	static void
		759	loop_init (EV_P_ unsigned int flags)
		760	{
		761	if (!method)
		762	{
197	#if HAVE_MONOTONIC	763	#if EV_USE_MONOTONIC
198	{	764	{
199	struct timespec ts;	765	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	766	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	767	have_monotonic = 1;
202	}	768	}
203	#endif	769	#endif
204		770
205	ev_now = ev_time ();	771	ev_rt_now = ev_time ();
		772	mn_now = get_clock ();
		773	now_floor = mn_now;
		774	rtmn_diff = ev_rt_now - mn_now;
206		775
		776	if (!(flags & EVFLAG_NOENV) && !enable_secure () && getenv ("LIBEV_FLAGS"))
		777	flags = atoi (getenv ("LIBEV_FLAGS"));
		778
		779	if (!(flags & 0x0000ffff))
		780	flags |= 0x0000ffff;
		781
		782	method = 0;
		783	#if EV_USE_KQUEUE
		784	if (!method && (flags & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ flags);
		785	#endif
207	#if HAVE_EPOLL	786	#if EV_USE_EPOLL
208	if (epoll_init (flags))	787	if (!method && (flags & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ flags);
209	return ev_method;
210	#endif	788	#endif
		789	#if EV_USE_POLL
		790	if (!method && (flags & EVMETHOD_POLL )) method = poll_init (EV_A_ flags);
		791	#endif
211	#if HAVE_SELECT	792	#if EV_USE_SELECT
212	if (select_init (flags))	793	if (!method && (flags & EVMETHOD_SELECT)) method = select_init (EV_A_ flags);
213	return ev_method;
214	#endif	794	#endif
215		795
216	ev_method = EVMETHOD_NONE;	796	ev_init (&sigev, sigcb);
217	return ev_method;	797	ev_set_priority (&sigev, EV_MAXPRI);
		798	}
218	}	799	}
219		800
220	void ev_prefork (void)	801	void
221	{	802	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	{	803	{
238	int i;	804	int i;
239		805
240	for (i = 0; i < pendingcnt; ++i)	806	#if EV_USE_KQUEUE
		807	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		808	#endif
		809	#if EV_USE_EPOLL
		810	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		811	#endif
		812	#if EV_USE_POLL
		813	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		814	#endif
		815	#if EV_USE_SELECT
		816	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		817	#endif
		818
		819	for (i = NUMPRI; i--; )
		820	array_free (pending, [i]);
		821
		822	/* have to use the microsoft-never-gets-it-right macro */
		823	array_free (fdchange, EMPTY0);
		824	array_free (timer, EMPTY0);
		825	#if EV_PERIODICS
		826	array_free (periodic, EMPTY0);
		827	#endif
		828	array_free (idle, EMPTY0);
		829	array_free (prepare, EMPTY0);
		830	array_free (check, EMPTY0);
		831
		832	method = 0;
		833	}
		834
		835	static void
		836	loop_fork (EV_P)
		837	{
		838	#if EV_USE_EPOLL
		839	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		840	#endif
		841	#if EV_USE_KQUEUE
		842	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		843	#endif
		844
		845	if (ev_is_active (&sigev))
		846	{
		847	/* default loop */
		848
		849	ev_ref (EV_A);
		850	ev_io_stop (EV_A_ &sigev);
		851	close (sigpipe [0]);
		852	close (sigpipe [1]);
		853
		854	while (pipe (sigpipe))
		855	syserr ("(libev) error creating pipe");
		856
		857	siginit (EV_A);
241	{	858	}
242	ANPENDING *p = pendings + i;
243		859
244	if (p->w)	860	postfork = 0;
		861	}
		862
		863	#if EV_MULTIPLICITY
		864	struct ev_loop *
		865	ev_loop_new (unsigned int flags)
		866	{
		867	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		868
		869	memset (loop, 0, sizeof (struct ev_loop));
		870
		871	loop_init (EV_A_ flags);
		872
		873	if (ev_method (EV_A))
		874	return loop;
		875
		876	return 0;
		877	}
		878
		879	void
		880	ev_loop_destroy (EV_P)
		881	{
		882	loop_destroy (EV_A);
		883	ev_free (loop);
		884	}
		885
		886	void
		887	ev_loop_fork (EV_P)
		888	{
		889	postfork = 1;
		890	}
		891
		892	#endif
		893
		894	#if EV_MULTIPLICITY
		895	struct ev_loop *
		896	#else
		897	int
		898	#endif
		899	ev_default_loop (unsigned int flags)
		900	{
		901	if (sigpipe [0] == sigpipe [1])
		902	if (pipe (sigpipe))
		903	return 0;
		904
		905	if (!default_loop)
		906	{
		907	#if EV_MULTIPLICITY
		908	struct ev_loop *loop = default_loop = &default_loop_struct;
		909	#else
		910	default_loop = 1;
		911	#endif
		912
		913	loop_init (EV_A_ flags);
		914
		915	if (ev_method (EV_A))
245	{	916	{
246	p->w->pending = 0;	917	siginit (EV_A);
247	p->w->cb (p->w, p->events);	918
		919	#ifndef _WIN32
		920	ev_signal_init (&childev, childcb, SIGCHLD);
		921	ev_set_priority (&childev, EV_MAXPRI);
		922	ev_signal_start (EV_A_ &childev);
		923	ev_unref (EV_A); /* child watcher should not keep loop alive */
		924	#endif
248	}	925	}
		926	else
		927	default_loop = 0;
		928	}
		929
		930	return default_loop;
		931	}
		932
		933	void
		934	ev_default_destroy (void)
		935	{
		936	#if EV_MULTIPLICITY
		937	struct ev_loop *loop = default_loop;
		938	#endif
		939
		940	#ifndef _WIN32
		941	ev_ref (EV_A); /* child watcher */
		942	ev_signal_stop (EV_A_ &childev);
		943	#endif
		944
		945	ev_ref (EV_A); /* signal watcher */
		946	ev_io_stop (EV_A_ &sigev);
		947
		948	close (sigpipe [0]); sigpipe [0] = 0;
		949	close (sigpipe [1]); sigpipe [1] = 0;
		950
		951	loop_destroy (EV_A);
		952	}
		953
		954	void
		955	ev_default_fork (void)
		956	{
		957	#if EV_MULTIPLICITY
		958	struct ev_loop *loop = default_loop;
		959	#endif
		960
		961	if (method)
		962	postfork = 1;
		963	}
		964
		965	/*****************************************************************************/
		966
		967	static int
		968	any_pending (EV_P)
		969	{
		970	int pri;
		971
		972	for (pri = NUMPRI; pri--; )
		973	if (pendingcnt [pri])
		974	return 1;
		975
		976	return 0;
		977	}
		978
		979	static void
		980	call_pending (EV_P)
		981	{
		982	int pri;
		983
		984	for (pri = NUMPRI; pri--; )
		985	while (pendingcnt [pri])
		986	{
		987	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		988
		989	if (p->w)
		990	{
		991	p->w->pending = 0;
		992	EV_CB_INVOKE (p->w, p->events);
		993	}
249	}	994	}
250
251	pendingcnt = 0;
252	}	995	}
253		996
254	static void	997	static void
255	timer_reify (void)	998	timers_reify (EV_P)
256	{	999	{
257	while (timercnt && timers [0]->at <= ev_now)	1000	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	1001	{
259	struct ev_timer *w = timers [0];	1002	struct ev_timer *w = timers [0];
260		1003
		1004	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		1005
261	/* first reschedule timer */	1006	/* first reschedule or stop timer */
262	if (w->repeat)	1007	if (w->repeat)
263	{	1008	{
264	if (w->is_abs)	1009	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;	1010
266	else
267	w->at = ev_now + w->repeat;	1011	((WT)w)->at += w->repeat;
		1012	if (((WT)w)->at < mn_now)
		1013	((WT)w)->at = mn_now;
268		1014
269	downheap (0);	1015	downheap ((WT *)timers, timercnt, 0);
270	}	1016	}
271	else	1017	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	1018	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		1019
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	1020	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1021	}
		1022	}
		1023
		1024	#if EV_PERIODICS
		1025	static void
		1026	periodics_reify (EV_P)
		1027	{
		1028	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
275	}	1029	{
276	}	1030	struct ev_periodic *w = periodics [0];
277		1031
278	int ev_loop_done;	1032	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
279		1033
		1034	/* first reschedule or stop timer */
		1035	if (w->reschedule_cb)
		1036	{
		1037	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1038	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1039	downheap ((WT *)periodics, periodiccnt, 0);
		1040	}
		1041	else if (w->interval)
		1042	{
		1043	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1044	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1045	downheap ((WT *)periodics, periodiccnt, 0);
		1046	}
		1047	else
		1048	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1049
		1050	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1051	}
		1052	}
		1053
		1054	static void
		1055	periodics_reschedule (EV_P)
		1056	{
		1057	int i;
		1058
		1059	/* adjust periodics after time jump */
		1060	for (i = 0; i < periodiccnt; ++i)
		1061	{
		1062	struct ev_periodic *w = periodics [i];
		1063
		1064	if (w->reschedule_cb)
		1065	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1066	else if (w->interval)
		1067	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1068	}
		1069
		1070	/* now rebuild the heap */
		1071	for (i = periodiccnt >> 1; i--; )
		1072	downheap ((WT *)periodics, periodiccnt, i);
		1073	}
		1074	#endif
		1075
		1076	inline int
		1077	time_update_monotonic (EV_P)
		1078	{
		1079	mn_now = get_clock ();
		1080
		1081	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1082	{
		1083	ev_rt_now = rtmn_diff + mn_now;
		1084	return 0;
		1085	}
		1086	else
		1087	{
		1088	now_floor = mn_now;
		1089	ev_rt_now = ev_time ();
		1090	return 1;
		1091	}
		1092	}
		1093
		1094	static void
		1095	time_update (EV_P)
		1096	{
		1097	int i;
		1098
		1099	#if EV_USE_MONOTONIC
		1100	if (expect_true (have_monotonic))
		1101	{
		1102	if (time_update_monotonic (EV_A))
		1103	{
		1104	ev_tstamp odiff = rtmn_diff;
		1105
		1106	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1107	{
		1108	rtmn_diff = ev_rt_now - mn_now;
		1109
		1110	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1111	return; /* all is well */
		1112
		1113	ev_rt_now = ev_time ();
		1114	mn_now = get_clock ();
		1115	now_floor = mn_now;
		1116	}
		1117
		1118	# if EV_PERIODICS
		1119	periodics_reschedule (EV_A);
		1120	# endif
		1121	/* no timer adjustment, as the monotonic clock doesn't jump */
		1122	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1123	}
		1124	}
		1125	else
		1126	#endif
		1127	{
		1128	ev_rt_now = ev_time ();
		1129
		1130	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1131	{
		1132	#if EV_PERIODICS
		1133	periodics_reschedule (EV_A);
		1134	#endif
		1135
		1136	/* adjust timers. this is easy, as the offset is the same for all */
		1137	for (i = 0; i < timercnt; ++i)
		1138	((WT)timers [i])->at += ev_rt_now - mn_now;
		1139	}
		1140
		1141	mn_now = ev_rt_now;
		1142	}
		1143	}
		1144
		1145	void
		1146	ev_ref (EV_P)
		1147	{
		1148	++activecnt;
		1149	}
		1150
		1151	void
		1152	ev_unref (EV_P)
		1153	{
		1154	--activecnt;
		1155	}
		1156
		1157	static int loop_done;
		1158
		1159	void
280	int ev_loop (int flags)	1160	ev_loop (EV_P_ int flags)
281	{	1161	{
282	double block;	1162	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	1163	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
284		1164
285	do	1165	while (activecnt)
286	{	1166	{
		1167	/* queue check watchers (and execute them) */
		1168	if (expect_false (preparecnt))
		1169	{
		1170	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1171	call_pending (EV_A);
		1172	}
		1173
		1174	/* we might have forked, so reify kernel state if necessary */
		1175	if (expect_false (postfork))
		1176	loop_fork (EV_A);
		1177
287	/* update fd-related kernel structures */	1178	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1179	fd_reify (EV_A);
289		1180
290	/* calculate blocking time */	1181	/* calculate blocking time */
		1182
		1183	/* we only need this for !monotonic clock or timers, but as we basically
		1184	always have timers, we just calculate it always */
		1185	#if EV_USE_MONOTONIC
		1186	if (expect_true (have_monotonic))
		1187	time_update_monotonic (EV_A);
		1188	else
		1189	#endif
		1190	{
291	ev_now = ev_time ();	1191	ev_rt_now = ev_time ();
		1192	mn_now = ev_rt_now;
		1193	}
292		1194
293	if (flags & EVLOOP_NONBLOCK)	1195	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	1196	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	1197	else
298	{	1198	{
		1199	block = MAX_BLOCKTIME;
		1200
		1201	if (timercnt)
		1202	{
299	block = timers [0]->at - ev_now + method_fudge;	1203	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
		1204	if (block > to) block = to;
		1205	}
		1206
		1207	#if EV_PERIODICS
		1208	if (periodiccnt)
		1209	{
		1210	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
		1211	if (block > to) block = to;
		1212	}
		1213	#endif
		1214
300	if (block < 0.) block = 0.;	1215	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1216	}
303		1217
304	method_poll (block);	1218	method_poll (EV_A_ block);
305		1219
		1220	/* update ev_rt_now, do magic */
		1221	time_update (EV_A);
		1222
306	/* put pending timers into pendign queue and reschedule them */	1223	/* queue pending timers and reschedule them */
307	timer_reify ();	1224	timers_reify (EV_A); /* relative timers called last */
		1225	#if EV_PERIODICS
		1226	periodics_reify (EV_A); /* absolute timers called first */
		1227	#endif
308		1228
309	ev_now = ev_time ();	1229	/* queue idle watchers unless io or timers are pending */
		1230	if (idlecnt && !any_pending (EV_A))
		1231	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1232
		1233	/* queue check watchers, to be executed first */
		1234	if (checkcnt)
		1235	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1236
310	call_pending ();	1237	call_pending (EV_A);
311	}
312	while (!ev_loop_done);
313	}
314		1238
315	static void	1239	if (loop_done)
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1240	break;
		1241	}
		1242
		1243	if (loop_done != 2)
		1244	loop_done = 0;
		1245	}
		1246
		1247	void
		1248	ev_unloop (EV_P_ int how)
		1249	{
		1250	loop_done = how;
		1251	}
		1252
		1253	/*****************************************************************************/
		1254
		1255	inline void
		1256	wlist_add (WL *head, WL elem)
317	{	1257	{
318	elem->next = *head;	1258	elem->next = *head;
319	*head = elem;	1259	*head = elem;
320	}	1260	}
321		1261
322	static void	1262	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1263	wlist_del (WL *head, WL elem)
324	{	1264	{
325	while (*head)	1265	while (*head)
326	{	1266	{
327	if (*head == elem)	1267	if (*head == elem)
328	{	1268	{
…		…
332		1272
333	head = &(*head)->next;	1273	head = &(*head)->next;
334	}	1274	}
335	}	1275	}
336		1276
337	static void	1277	inline void
338	ev_start (struct ev_watcher *w, int active)	1278	ev_clear_pending (EV_P_ W w)
339	{	1279	{
		1280	if (w->pending)
		1281	{
		1282	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	1283	w->pending = 0;
		1284	}
		1285	}
		1286
		1287	inline void
		1288	ev_start (EV_P_ W w, int active)
		1289	{
		1290	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1291	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1292
341	w->active = active;	1293	w->active = active;
		1294	ev_ref (EV_A);
342	}	1295	}
343		1296
344	static void	1297	inline void
345	ev_stop (struct ev_watcher *w)	1298	ev_stop (EV_P_ W w)
346	{	1299	{
347	if (w->pending)	1300	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	1301	w->active = 0;
351	/* nop */
352	}	1302	}
353		1303
		1304	/*****************************************************************************/
		1305
354	void	1306	void
355	evio_start (struct ev_io *w)	1307	ev_io_start (EV_P_ struct ev_io *w)
356	{	1308	{
		1309	int fd = w->fd;
		1310
357	if (ev_is_active (w))	1311	if (ev_is_active (w))
358	return;	1312	return;
359		1313
360	int fd = w->fd;	1314	assert (("ev_io_start called with negative fd", fd >= 0));
361		1315
362	ev_start ((struct ev_watcher *)w, 1);	1316	ev_start (EV_A_ (W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1317	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1318	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		1319
366	++fdchangecnt;	1320	fd_change (EV_A_ fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	1321	}
370		1322
371	void	1323	void
372	evio_stop (struct ev_io *w)	1324	ev_io_stop (EV_P_ struct ev_io *w)
373	{	1325	{
		1326	ev_clear_pending (EV_A_ (W)w);
374	if (!ev_is_active (w))	1327	if (!ev_is_active (w))
375	return;	1328	return;
376		1329
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1330	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
378	ev_stop ((struct ev_watcher *)w);
379		1331
380	++fdchangecnt;	1332	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	1333	ev_stop (EV_A_ (W)w);
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}
384		1334
		1335	fd_change (EV_A_ w->fd);
		1336	}
		1337
385	void	1338	void
386	evtimer_start (struct ev_timer *w)	1339	ev_timer_start (EV_P_ struct ev_timer *w)
387	{	1340	{
388	if (ev_is_active (w))	1341	if (ev_is_active (w))
389	return;	1342	return;
390		1343
391	if (w->is_abs)	1344	((WT)w)->at += mn_now;
		1345
		1346	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1347
		1348	ev_start (EV_A_ (W)w, ++timercnt);
		1349	array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
		1350	timers [timercnt - 1] = w;
		1351	upheap ((WT *)timers, timercnt - 1);
		1352
		1353	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1354	}
		1355
		1356	void
		1357	ev_timer_stop (EV_P_ struct ev_timer *w)
		1358	{
		1359	ev_clear_pending (EV_A_ (W)w);
		1360	if (!ev_is_active (w))
		1361	return;
		1362
		1363	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1364
		1365	if (((W)w)->active < timercnt--)
		1366	{
		1367	timers [((W)w)->active - 1] = timers [timercnt];
		1368	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
392	{	1369	}
393	/* this formula differs from the one in timer_reify becuse we do not round up */	1370
		1371	((WT)w)->at -= mn_now;
		1372
		1373	ev_stop (EV_A_ (W)w);
		1374	}
		1375
		1376	void
		1377	ev_timer_again (EV_P_ struct ev_timer *w)
		1378	{
		1379	if (ev_is_active (w))
		1380	{
394	if (w->repeat)	1381	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1382	{
		1383	((WT)w)->at = mn_now + w->repeat;
		1384	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1385	}
		1386	else
		1387	ev_timer_stop (EV_A_ w);
		1388	}
		1389	else if (w->repeat)
396	}	1390	{
		1391	w->at = w->repeat;
		1392	ev_timer_start (EV_A_ w);
		1393	}
		1394	}
		1395
		1396	#if EV_PERIODICS
		1397	void
		1398	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1399	{
		1400	if (ev_is_active (w))
		1401	return;
		1402
		1403	if (w->reschedule_cb)
		1404	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1405	else if (w->interval)
		1406	{
		1407	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1408	/* this formula differs from the one in periodic_reify because we do not always round up */
		1409	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1410	}
		1411
		1412	ev_start (EV_A_ (W)w, ++periodiccnt);
		1413	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1414	periodics [periodiccnt - 1] = w;
		1415	upheap ((WT *)periodics, periodiccnt - 1);
		1416
		1417	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1418	}
		1419
		1420	void
		1421	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1422	{
		1423	ev_clear_pending (EV_A_ (W)w);
		1424	if (!ev_is_active (w))
		1425	return;
		1426
		1427	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1428
		1429	if (((W)w)->active < periodiccnt--)
		1430	{
		1431	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1432	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1433	}
		1434
		1435	ev_stop (EV_A_ (W)w);
		1436	}
		1437
		1438	void
		1439	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1440	{
		1441	/* TODO: use adjustheap and recalculation */
		1442	ev_periodic_stop (EV_A_ w);
		1443	ev_periodic_start (EV_A_ w);
		1444	}
		1445	#endif
		1446
		1447	void
		1448	ev_idle_start (EV_P_ struct ev_idle *w)
		1449	{
		1450	if (ev_is_active (w))
		1451	return;
		1452
		1453	ev_start (EV_A_ (W)w, ++idlecnt);
		1454	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1455	idles [idlecnt - 1] = w;
		1456	}
		1457
		1458	void
		1459	ev_idle_stop (EV_P_ struct ev_idle *w)
		1460	{
		1461	ev_clear_pending (EV_A_ (W)w);
		1462	if (!ev_is_active (w))
		1463	return;
		1464
		1465	idles [((W)w)->active - 1] = idles [--idlecnt];
		1466	ev_stop (EV_A_ (W)w);
		1467	}
		1468
		1469	void
		1470	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1471	{
		1472	if (ev_is_active (w))
		1473	return;
		1474
		1475	ev_start (EV_A_ (W)w, ++preparecnt);
		1476	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1477	prepares [preparecnt - 1] = w;
		1478	}
		1479
		1480	void
		1481	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1482	{
		1483	ev_clear_pending (EV_A_ (W)w);
		1484	if (!ev_is_active (w))
		1485	return;
		1486
		1487	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1488	ev_stop (EV_A_ (W)w);
		1489	}
		1490
		1491	void
		1492	ev_check_start (EV_P_ struct ev_check *w)
		1493	{
		1494	if (ev_is_active (w))
		1495	return;
		1496
		1497	ev_start (EV_A_ (W)w, ++checkcnt);
		1498	array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1499	checks [checkcnt - 1] = w;
		1500	}
		1501
		1502	void
		1503	ev_check_stop (EV_P_ struct ev_check *w)
		1504	{
		1505	ev_clear_pending (EV_A_ (W)w);
		1506	if (!ev_is_active (w))
		1507	return;
		1508
		1509	checks [((W)w)->active - 1] = checks [--checkcnt];
		1510	ev_stop (EV_A_ (W)w);
		1511	}
		1512
		1513	#ifndef SA_RESTART
		1514	# define SA_RESTART 0
		1515	#endif
		1516
		1517	void
		1518	ev_signal_start (EV_P_ struct ev_signal *w)
		1519	{
		1520	#if EV_MULTIPLICITY
		1521	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1522	#endif
		1523	if (ev_is_active (w))
		1524	return;
		1525
		1526	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1527
		1528	ev_start (EV_A_ (W)w, 1);
		1529	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1530	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1531
		1532	if (!((WL)w)->next)
		1533	{
		1534	#if _WIN32
		1535	signal (w->signum, sighandler);
		1536	#else
		1537	struct sigaction sa;
		1538	sa.sa_handler = sighandler;
		1539	sigfillset (&sa.sa_mask);
		1540	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1541	sigaction (w->signum, &sa, 0);
		1542	#endif
		1543	}
		1544	}
		1545
		1546	void
		1547	ev_signal_stop (EV_P_ struct ev_signal *w)
		1548	{
		1549	ev_clear_pending (EV_A_ (W)w);
		1550	if (!ev_is_active (w))
		1551	return;
		1552
		1553	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1554	ev_stop (EV_A_ (W)w);
		1555
		1556	if (!signals [w->signum - 1].head)
		1557	signal (w->signum, SIG_DFL);
		1558	}
		1559
		1560	void
		1561	ev_child_start (EV_P_ struct ev_child *w)
		1562	{
		1563	#if EV_MULTIPLICITY
		1564	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1565	#endif
		1566	if (ev_is_active (w))
		1567	return;
		1568
		1569	ev_start (EV_A_ (W)w, 1);
		1570	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1571	}
		1572
		1573	void
		1574	ev_child_stop (EV_P_ struct ev_child *w)
		1575	{
		1576	ev_clear_pending (EV_A_ (W)w);
		1577	if (!ev_is_active (w))
		1578	return;
		1579
		1580	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1581	ev_stop (EV_A_ (W)w);
		1582	}
		1583
		1584	/*****************************************************************************/
		1585
		1586	struct ev_once
		1587	{
		1588	struct ev_io io;
		1589	struct ev_timer to;
		1590	void (*cb)(int revents, void *arg);
		1591	void *arg;
		1592	};
		1593
		1594	static void
		1595	once_cb (EV_P_ struct ev_once *once, int revents)
		1596	{
		1597	void (*cb)(int revents, void *arg) = once->cb;
		1598	void *arg = once->arg;
		1599
		1600	ev_io_stop (EV_A_ &once->io);
		1601	ev_timer_stop (EV_A_ &once->to);
		1602	ev_free (once);
		1603
		1604	cb (revents, arg);
		1605	}
		1606
		1607	static void
		1608	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1609	{
		1610	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1611	}
		1612
		1613	static void
		1614	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1615	{
		1616	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1617	}
		1618
		1619	void
		1620	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1621	{
		1622	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1623
		1624	if (!once)
		1625	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
397	else	1626	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	}	1627	{
		1628	once->cb = cb;
		1629	once->arg = arg;
417		1630
418	ev_stop ((struct ev_watcher *)w);	1631	ev_init (&once->io, once_cb_io);
419	}	1632	if (fd >= 0)
		1633	{
		1634	ev_io_set (&once->io, fd, events);
		1635	ev_io_start (EV_A_ &once->io);
		1636	}
420		1637
421	void	1638	ev_init (&once->to, once_cb_to);
422	evsignal_start (struct ev_signal *w)	1639	if (timeout >= 0.)
423	{	1640	{
424	if (ev_is_active (w))	1641	ev_timer_set (&once->to, timeout, 0.);
425	return;	1642	ev_timer_start (EV_A_ &once->to);
426		1643	}
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	{	1644	}
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	}	1645	}
484		1646
		1647	#ifdef __cplusplus
		1648	}
485	#endif	1649	#endif
486		1650
487
488
489

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