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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 1.98 by root, Sun Nov 11 02:05:20 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 && 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	#endif
		85	/**/
		86
		87	#ifndef EV_USE_MONOTONIC
		88	# define EV_USE_MONOTONIC 1
		89	#endif
		90
		91	#ifndef EV_USE_SELECT
		92	# define EV_USE_SELECT 1
		93	#endif
		94
		95	#ifndef EV_USE_POLL
		96	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		97	#endif
		98
		99	#ifndef EV_USE_EPOLL
		100	# define EV_USE_EPOLL 0
		101	#endif
		102
		103	#ifndef EV_USE_KQUEUE
		104	# define EV_USE_KQUEUE 0
		105	#endif
		106
		107	#ifndef EV_USE_WIN32
		108	# ifdef WIN32
		109	# define EV_USE_WIN32 0 /* it does not exist, use select */
		110	# undef EV_USE_SELECT
		111	# define EV_USE_SELECT 1
		112	# else
		113	# define EV_USE_WIN32 0
		114	# endif
		115	#endif
		116
		117	#ifndef EV_USE_REALTIME
		118	# define EV_USE_REALTIME 1
		119	#endif
		120
		121	/**/
		122
10	#ifdef CLOCK_MONOTONIC	123	#ifndef CLOCK_MONOTONIC
		124	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	125	# define EV_USE_MONOTONIC 0
12	#endif	126	#endif
13		127
14	#define HAVE_EPOLL 1	128	#ifndef CLOCK_REALTIME
		129	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	130	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	131	#endif
17		132
18	#define MAX_BLOCKTIME 60.	133	/**/
19		134
		135	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		136	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		137	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		138	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
		139
		140	#ifdef EV_H
		141	# include EV_H
		142	#else
20	#include "ev.h"	143	# include "ev.h"
		144	#endif
21		145
		146	#if __GNUC__ >= 3
		147	# define expect(expr,value) __builtin_expect ((expr),(value))
		148	# define inline inline
		149	#else
		150	# define expect(expr,value) (expr)
		151	# define inline static
		152	#endif
		153
		154	#define expect_false(expr) expect ((expr) != 0, 0)
		155	#define expect_true(expr) expect ((expr) != 0, 1)
		156
		157	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		158	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		159
22	struct ev_watcher {	160	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	161	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	162	typedef struct ev_watcher_time *WT;
28	};
29		163
		164	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		165
		166	#ifdef WIN32
		167	# include "ev_win32.c"
		168	#endif
		169
		170	/*****************************************************************************/
		171
		172	static void (*syserr_cb)(const char *msg);
		173
		174	void ev_set_syserr_cb (void (*cb)(const char *msg))
		175	{
		176	syserr_cb = cb;
		177	}
		178
		179	static void
		180	syserr (const char *msg)
		181	{
		182	if (!msg)
		183	msg = "(libev) system error";
		184
		185	if (syserr_cb)
		186	syserr_cb (msg);
		187	else
		188	{
		189	perror (msg);
		190	abort ();
		191	}
		192	}
		193
		194	static void *(*alloc)(void *ptr, long size);
		195
		196	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		197	{
		198	alloc = cb;
		199	}
		200
		201	static void *
		202	ev_realloc (void *ptr, long size)
		203	{
		204	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		205
		206	if (!ptr && size)
		207	{
		208	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		209	abort ();
		210	}
		211
		212	return ptr;
		213	}
		214
		215	#define ev_malloc(size) ev_realloc (0, (size))
		216	#define ev_free(ptr) ev_realloc ((ptr), 0)
		217
		218	/*****************************************************************************/
		219
		220	typedef struct
		221	{
		222	WL head;
		223	unsigned char events;
		224	unsigned char reify;
		225	} ANFD;
		226
		227	typedef struct
		228	{
		229	W w;
		230	int events;
		231	} ANPENDING;
		232
		233	#if EV_MULTIPLICITY
		234
		235	struct ev_loop
		236	{
		237	ev_tstamp ev_rt_now;
		238	#define VAR(name,decl) decl;
		239	#include "ev_vars.h"
		240	#undef VAR
		241	};
		242	#include "ev_wrap.h"
		243
		244	struct ev_loop default_loop_struct;
		245	static struct ev_loop *default_loop;
		246
		247	#else
		248
30	ev_tstamp ev_now;	249	ev_tstamp ev_rt_now;
31	int ev_method;	250	#define VAR(name,decl) static decl;
		251	#include "ev_vars.h"
		252	#undef VAR
32		253
33	static int have_monotonic; /* runtime */	254	static int default_loop;
34		255
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	256	#endif
36	static void (*method_reify)(void);	257
37	static void (*method_poll)(ev_tstamp timeout);	258	/*****************************************************************************/
38		259
39	ev_tstamp	260	ev_tstamp
40	ev_time (void)	261	ev_time (void)
41	{	262	{
42	#if HAVE_REALTIME	263	#if EV_USE_REALTIME
43	struct timespec ts;	264	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	265	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	266	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	267	#else
47	struct timeval tv;	268	struct timeval tv;
48	gettimeofday (&tv, 0);	269	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	270	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	271	#endif
51	}	272	}
52		273
53	static ev_tstamp	274	inline ev_tstamp
54	get_clock (void)	275	get_clock (void)
55	{	276	{
56	#if HAVE_MONOTONIC	277	#if EV_USE_MONOTONIC
57	if (have_monotonic)	278	if (expect_true (have_monotonic))
58	{	279	{
59	struct timespec ts;	280	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	281	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	282	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	283	}
63	#endif	284	#endif
64		285
65	return ev_time ();	286	return ev_time ();
66	}	287	}
67		288
		289	#if EV_MULTIPLICITY
		290	ev_tstamp
		291	ev_now (EV_P)
		292	{
		293	return ev_rt_now;
		294	}
		295	#endif
		296
		297	#define array_roundsize(type,n) ((n) | 4 & ~3)
		298
68	#define array_needsize(base,cur,cnt,init) \	299	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	300	if (expect_false ((cnt) > cur)) \
70	{ \	301	{ \
71	int newcnt = cur ? cur << 1 : 16; \	302	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	303	do \
		304	{ \
		305	newcnt = array_roundsize (type, newcnt << 1); \
		306	} \
		307	while ((cnt) > newcnt); \
		308	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	309	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
74	init (base + cur, newcnt - cur); \	310	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	311	cur = newcnt; \
76	}	312	}
77		313
78	typedef struct	314	#define array_slim(type,stem) \
79	{	315	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
80	struct ev_io *head;	316	{ \
81	unsigned char wev, rev; /* want, received event set */	317	stem ## max = array_roundsize (stem ## cnt >> 1); \
82	} ANFD;	318	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		319	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		320	}
83		321
84	static ANFD *anfds;	322	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
85	static int anfdmax;	323	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		324	#define array_free_microshit(stem) \
		325	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
86		326
87	static int *fdchanges;	327	#define array_free(stem, idx) \
88	static int fdchangemax, fdchangecnt;	328	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		329
		330	/*****************************************************************************/
89		331
90	static void	332	static void
91	anfds_init (ANFD *base, int count)	333	anfds_init (ANFD *base, int count)
92	{	334	{
93	while (count--)	335	while (count--)
94	{	336	{
95	base->head = 0;	337	base->head = 0;
96	base->wev = base->rev = EV_NONE;	338	base->events = EV_NONE;
		339	base->reify = 0;
		340
97	++base;	341	++base;
98	}	342	}
99	}	343	}
100		344
101	typedef struct	345	void
		346	ev_feed_event (EV_P_ void *w, int revents)
102	{	347	{
103	struct ev_watcher *w;	348	W w_ = (W)w;
104	int events;
105	} ANPENDING;
106		349
107	static ANPENDING *pendings;	350	if (w_->pending)
108	static int pendingmax, pendingcnt;	351	{
		352	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		353	return;
		354	}
109		355
110	static void
111	event (struct ev_watcher *w, int events)
112	{
113	w->pending = ++pendingcnt;	356	w_->pending = ++pendingcnt [ABSPRI (w_)];
114	array_needsize (pendings, pendingmax, pendingcnt, );	357	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
115	pendings [pendingcnt - 1].w = w;	358	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
116	pendings [pendingcnt - 1].events = events;	359	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
117	}	360	}
118		361
119	static void	362	static void
		363	queue_events (EV_P_ W *events, int eventcnt, int type)
		364	{
		365	int i;
		366
		367	for (i = 0; i < eventcnt; ++i)
		368	ev_feed_event (EV_A_ events [i], type);
		369	}
		370
		371	inline void
120	fd_event (int fd, int events)	372	fd_event (EV_P_ int fd, int revents)
121	{	373	{
122	ANFD *anfd = anfds + fd;	374	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	375	struct ev_io *w;
124		376
125	for (w = anfd->head; w; w = w->next)	377	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
126	{	378	{
127	int ev = w->events & events;	379	int ev = w->events & revents;
128		380
129	if (ev)	381	if (ev)
130	event ((struct ev_watcher *)w, ev);	382	ev_feed_event (EV_A_ (W)w, ev);
		383	}
		384	}
		385
		386	void
		387	ev_feed_fd_event (EV_P_ int fd, int revents)
		388	{
		389	fd_event (EV_A_ fd, revents);
		390	}
		391
		392	/*****************************************************************************/
		393
		394	static void
		395	fd_reify (EV_P)
		396	{
		397	int i;
		398
		399	for (i = 0; i < fdchangecnt; ++i)
		400	{
		401	int fd = fdchanges [i];
		402	ANFD *anfd = anfds + fd;
		403	struct ev_io *w;
		404
		405	int events = 0;
		406
		407	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		408	events |= w->events;
		409
		410	anfd->reify = 0;
		411
		412	method_modify (EV_A_ fd, anfd->events, events);
		413	anfd->events = events;
		414	}
		415
		416	fdchangecnt = 0;
		417	}
		418
		419	static void
		420	fd_change (EV_P_ int fd)
		421	{
		422	if (anfds [fd].reify)
		423	return;
		424
		425	anfds [fd].reify = 1;
		426
		427	++fdchangecnt;
		428	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		429	fdchanges [fdchangecnt - 1] = fd;
		430	}
		431
		432	static void
		433	fd_kill (EV_P_ int fd)
		434	{
		435	struct ev_io *w;
		436
		437	while ((w = (struct ev_io *)anfds [fd].head))
		438	{
		439	ev_io_stop (EV_A_ w);
		440	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		441	}
		442	}
		443
		444	static int
		445	fd_valid (int fd)
		446	{
		447	#ifdef WIN32
		448	return !!win32_get_osfhandle (fd);
		449	#else
		450	return fcntl (fd, F_GETFD) != -1;
		451	#endif
		452	}
		453
		454	/* called on EBADF to verify fds */
		455	static void
		456	fd_ebadf (EV_P)
		457	{
		458	int fd;
		459
		460	for (fd = 0; fd < anfdmax; ++fd)
		461	if (anfds [fd].events)
		462	if (!fd_valid (fd) == -1 && errno == EBADF)
		463	fd_kill (EV_A_ fd);
		464	}
		465
		466	/* called on ENOMEM in select/poll to kill some fds and retry */
		467	static void
		468	fd_enomem (EV_P)
		469	{
		470	int fd;
		471
		472	for (fd = anfdmax; fd--; )
		473	if (anfds [fd].events)
		474	{
		475	fd_kill (EV_A_ fd);
		476	return;
131	}	477	}
132	}	478	}
133		479
134	static struct ev_timer **timers;	480	/* usually called after fork if method needs to re-arm all fds from scratch */
135	static int timermax, timercnt;
136
137	static void	481	static void
138	upheap (int k)	482	fd_rearm_all (EV_P)
139	{	483	{
140	struct ev_timer *w = timers [k];	484	int fd;
141		485
		486	/* this should be highly optimised to not do anything but set a flag */
		487	for (fd = 0; fd < anfdmax; ++fd)
		488	if (anfds [fd].events)
		489	{
		490	anfds [fd].events = 0;
		491	fd_change (EV_A_ fd);
		492	}
		493	}
		494
		495	/*****************************************************************************/
		496
		497	static void
		498	upheap (WT *heap, int k)
		499	{
		500	WT w = heap [k];
		501
142	while (k && timers [k >> 1]->at > w->at)	502	while (k && heap [k >> 1]->at > w->at)
143	{	503	{
144	timers [k] = timers [k >> 1];	504	heap [k] = heap [k >> 1];
145	timers [k]->active = k + 1;	505	((W)heap [k])->active = k + 1;
146	k >>= 1;	506	k >>= 1;
147	}	507	}
148		508
149	timers [k] = w;	509	heap [k] = w;
150	timers [k]->active = k + 1;	510	((W)heap [k])->active = k + 1;
151		511
152	}	512	}
153		513
154	static void	514	static void
155	downheap (int k)	515	downheap (WT *heap, int N, int k)
156	{	516	{
157	struct ev_timer *w = timers [k];	517	WT w = heap [k];
158		518
159	while (k < (timercnt >> 1))	519	while (k < (N >> 1))
160	{	520	{
161	int j = k << 1;	521	int j = k << 1;
162		522
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	523	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
164	++j;	524	++j;
165		525
166	if (w->at <= timers [j]->at)	526	if (w->at <= heap [j]->at)
167	break;	527	break;
168		528
169	timers [k] = timers [j];	529	heap [k] = heap [j];
170	timers [k]->active = k + 1;	530	((W)heap [k])->active = k + 1;
171	k = j;	531	k = j;
172	}	532	}
173		533
174	timers [k] = w;	534	heap [k] = w;
175	timers [k]->active = k + 1;	535	((W)heap [k])->active = k + 1;
176	}	536	}
177		537
178	static struct ev_signal **signals;	538	inline void
		539	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		540	{
		541	ev_tstamp old_at = heap [k]->at;
		542	heap [k]->at = at;
		543
		544	if (old_at < at)
		545	downheap (heap, N, k);
		546	else
		547	upheap (heap, k);
		548	}
		549
		550	/*****************************************************************************/
		551
		552	typedef struct
		553	{
		554	WL head;
		555	sig_atomic_t volatile gotsig;
		556	} ANSIG;
		557
		558	static ANSIG *signals;
179	static int signalmax, signalcnt;	559	static int signalmax;
180		560
		561	static int sigpipe [2];
		562	static sig_atomic_t volatile gotsig;
		563	static struct ev_io sigev;
		564
181	static void	565	static void
182	signals_init (struct ev_signal **base, int count)	566	signals_init (ANSIG *base, int count)
183	{	567	{
184	while (count--)	568	while (count--)
185	*base++ = 0;	569	{
186	}	570	base->head = 0;
		571	base->gotsig = 0;
187		572
		573	++base;
		574	}
		575	}
		576
		577	static void
		578	sighandler (int signum)
		579	{
		580	#if WIN32
		581	signal (signum, sighandler);
		582	#endif
		583
		584	signals [signum - 1].gotsig = 1;
		585
		586	if (!gotsig)
		587	{
		588	int old_errno = errno;
		589	gotsig = 1;
		590	#ifdef WIN32
		591	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		592	#else
		593	write (sigpipe [1], &signum, 1);
		594	#endif
		595	errno = old_errno;
		596	}
		597	}
		598
		599	void
		600	ev_feed_signal_event (EV_P_ int signum)
		601	{
		602	WL w;
		603
		604	#if EV_MULTIPLICITY
		605	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		606	#endif
		607
		608	--signum;
		609
		610	if (signum < 0 || signum >= signalmax)
		611	return;
		612
		613	signals [signum].gotsig = 0;
		614
		615	for (w = signals [signum].head; w; w = w->next)
		616	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		617	}
		618
		619	static void
		620	sigcb (EV_P_ struct ev_io *iow, int revents)
		621	{
		622	int signum;
		623
		624	#ifdef WIN32
		625	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		626	#else
		627	read (sigpipe [0], &revents, 1);
		628	#endif
		629	gotsig = 0;
		630
		631	for (signum = signalmax; signum--; )
		632	if (signals [signum].gotsig)
		633	ev_feed_signal_event (EV_A_ signum + 1);
		634	}
		635
		636	static void
		637	siginit (EV_P)
		638	{
		639	#ifndef WIN32
		640	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		641	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		642
		643	/* rather than sort out wether we really need nb, set it */
		644	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		645	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		646	#endif
		647
		648	ev_io_set (&sigev, sigpipe [0], EV_READ);
		649	ev_io_start (EV_A_ &sigev);
		650	ev_unref (EV_A); /* child watcher should not keep loop alive */
		651	}
		652
		653	/*****************************************************************************/
		654
		655	static struct ev_child *childs [PID_HASHSIZE];
		656
		657	#ifndef WIN32
		658
		659	static struct ev_signal childev;
		660
		661	#ifndef WCONTINUED
		662	# define WCONTINUED 0
		663	#endif
		664
		665	static void
		666	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		667	{
		668	struct ev_child *w;
		669
		670	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		671	if (w->pid == pid || !w->pid)
		672	{
		673	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		674	w->rpid = pid;
		675	w->rstatus = status;
		676	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		677	}
		678	}
		679
		680	static void
		681	childcb (EV_P_ struct ev_signal *sw, int revents)
		682	{
		683	int pid, status;
		684
		685	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		686	{
		687	/* make sure we are called again until all childs have been reaped */
		688	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		689
		690	child_reap (EV_A_ sw, pid, pid, status);
		691	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		692	}
		693	}
		694
		695	#endif
		696
		697	/*****************************************************************************/
		698
		699	#if EV_USE_KQUEUE
		700	# include "ev_kqueue.c"
		701	#endif
188	#if HAVE_EPOLL	702	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	703	# include "ev_epoll.c"
190	#endif	704	#endif
		705	#if EV_USE_POLL
		706	# include "ev_poll.c"
		707	#endif
191	#if HAVE_SELECT	708	#if EV_USE_SELECT
192	# include "ev_select.c"	709	# include "ev_select.c"
193	#endif	710	#endif
194		711
195	int ev_init (int flags)	712	int
		713	ev_version_major (void)
196	{	714	{
		715	return EV_VERSION_MAJOR;
		716	}
		717
		718	int
		719	ev_version_minor (void)
		720	{
		721	return EV_VERSION_MINOR;
		722	}
		723
		724	/* return true if we are running with elevated privileges and should ignore env variables */
		725	static int
		726	enable_secure (void)
		727	{
		728	#ifdef WIN32
		729	return 0;
		730	#else
		731	return getuid () != geteuid ()
		732	|| getgid () != getegid ();
		733	#endif
		734	}
		735
		736	int
		737	ev_method (EV_P)
		738	{
		739	return method;
		740	}
		741
		742	static void
		743	loop_init (EV_P_ int methods)
		744	{
		745	if (!method)
		746	{
197	#if HAVE_MONOTONIC	747	#if EV_USE_MONOTONIC
198	{	748	{
199	struct timespec ts;	749	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	750	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	751	have_monotonic = 1;
202	}	752	}
203	#endif	753	#endif
204		754
205	ev_now = ev_time ();	755	ev_rt_now = ev_time ();
		756	mn_now = get_clock ();
		757	now_floor = mn_now;
		758	rtmn_diff = ev_rt_now - mn_now;
206		759
		760	if (methods == EVMETHOD_AUTO)
		761	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		762	methods = atoi (getenv ("LIBEV_METHODS"));
		763	else
		764	methods = EVMETHOD_ANY;
		765
		766	method = 0;
		767	#if EV_USE_WIN32
		768	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		769	#endif
		770	#if EV_USE_KQUEUE
		771	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		772	#endif
207	#if HAVE_EPOLL	773	#if EV_USE_EPOLL
208	if (epoll_init (flags))	774	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
209	return ev_method;
210	#endif	775	#endif
		776	#if EV_USE_POLL
		777	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		778	#endif
211	#if HAVE_SELECT	779	#if EV_USE_SELECT
212	if (select_init (flags))	780	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
213	return ev_method;
214	#endif	781	#endif
215		782
216	ev_method = EVMETHOD_NONE;	783	ev_init (&sigev, sigcb);
217	return ev_method;	784	ev_set_priority (&sigev, EV_MAXPRI);
		785	}
218	}	786	}
219		787
220	void ev_prefork (void)	788	void
221	{	789	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	{	790	{
238	int i;	791	int i;
239		792
240	for (i = 0; i < pendingcnt; ++i)	793	#if EV_USE_WIN32
		794	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		795	#endif
		796	#if EV_USE_KQUEUE
		797	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		798	#endif
		799	#if EV_USE_EPOLL
		800	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		801	#endif
		802	#if EV_USE_POLL
		803	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		804	#endif
		805	#if EV_USE_SELECT
		806	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		807	#endif
		808
		809	for (i = NUMPRI; i--; )
		810	array_free (pending, [i]);
		811
		812	/* have to use the microsoft-never-gets-it-right macro */
		813	array_free_microshit (fdchange);
		814	array_free_microshit (timer);
		815	#if EV_PERIODICS
		816	array_free_microshit (periodic);
		817	#endif
		818	array_free_microshit (idle);
		819	array_free_microshit (prepare);
		820	array_free_microshit (check);
		821
		822	method = 0;
		823	}
		824
		825	static void
		826	loop_fork (EV_P)
		827	{
		828	#if EV_USE_EPOLL
		829	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		830	#endif
		831	#if EV_USE_KQUEUE
		832	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		833	#endif
		834
		835	if (ev_is_active (&sigev))
		836	{
		837	/* default loop */
		838
		839	ev_ref (EV_A);
		840	ev_io_stop (EV_A_ &sigev);
		841	close (sigpipe [0]);
		842	close (sigpipe [1]);
		843
		844	while (pipe (sigpipe))
		845	syserr ("(libev) error creating pipe");
		846
		847	siginit (EV_A);
241	{	848	}
242	ANPENDING *p = pendings + i;
243		849
244	if (p->w)	850	postfork = 0;
		851	}
		852
		853	#if EV_MULTIPLICITY
		854	struct ev_loop *
		855	ev_loop_new (int methods)
		856	{
		857	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		858
		859	memset (loop, 0, sizeof (struct ev_loop));
		860
		861	loop_init (EV_A_ methods);
		862
		863	if (ev_method (EV_A))
		864	return loop;
		865
		866	return 0;
		867	}
		868
		869	void
		870	ev_loop_destroy (EV_P)
		871	{
		872	loop_destroy (EV_A);
		873	ev_free (loop);
		874	}
		875
		876	void
		877	ev_loop_fork (EV_P)
		878	{
		879	postfork = 1;
		880	}
		881
		882	#endif
		883
		884	#if EV_MULTIPLICITY
		885	struct ev_loop *
		886	#else
		887	int
		888	#endif
		889	ev_default_loop (int methods)
		890	{
		891	if (sigpipe [0] == sigpipe [1])
		892	if (pipe (sigpipe))
		893	return 0;
		894
		895	if (!default_loop)
		896	{
		897	#if EV_MULTIPLICITY
		898	struct ev_loop *loop = default_loop = &default_loop_struct;
		899	#else
		900	default_loop = 1;
		901	#endif
		902
		903	loop_init (EV_A_ methods);
		904
		905	if (ev_method (EV_A))
245	{	906	{
246	p->w->pending = 0;	907	siginit (EV_A);
247	p->w->cb (p->w, p->events);	908
		909	#ifndef WIN32
		910	ev_signal_init (&childev, childcb, SIGCHLD);
		911	ev_set_priority (&childev, EV_MAXPRI);
		912	ev_signal_start (EV_A_ &childev);
		913	ev_unref (EV_A); /* child watcher should not keep loop alive */
		914	#endif
248	}	915	}
		916	else
		917	default_loop = 0;
		918	}
		919
		920	return default_loop;
		921	}
		922
		923	void
		924	ev_default_destroy (void)
		925	{
		926	#if EV_MULTIPLICITY
		927	struct ev_loop *loop = default_loop;
		928	#endif
		929
		930	#ifndef WIN32
		931	ev_ref (EV_A); /* child watcher */
		932	ev_signal_stop (EV_A_ &childev);
		933	#endif
		934
		935	ev_ref (EV_A); /* signal watcher */
		936	ev_io_stop (EV_A_ &sigev);
		937
		938	close (sigpipe [0]); sigpipe [0] = 0;
		939	close (sigpipe [1]); sigpipe [1] = 0;
		940
		941	loop_destroy (EV_A);
		942	}
		943
		944	void
		945	ev_default_fork (void)
		946	{
		947	#if EV_MULTIPLICITY
		948	struct ev_loop *loop = default_loop;
		949	#endif
		950
		951	if (method)
		952	postfork = 1;
		953	}
		954
		955	/*****************************************************************************/
		956
		957	static int
		958	any_pending (EV_P)
		959	{
		960	int pri;
		961
		962	for (pri = NUMPRI; pri--; )
		963	if (pendingcnt [pri])
		964	return 1;
		965
		966	return 0;
		967	}
		968
		969	static void
		970	call_pending (EV_P)
		971	{
		972	int pri;
		973
		974	for (pri = NUMPRI; pri--; )
		975	while (pendingcnt [pri])
		976	{
		977	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		978
		979	if (p->w)
		980	{
		981	p->w->pending = 0;
		982	EV_CB_INVOKE (p->w, p->events);
		983	}
249	}	984	}
250
251	pendingcnt = 0;
252	}	985	}
253		986
254	static void	987	static void
255	timer_reify (void)	988	timers_reify (EV_P)
256	{	989	{
257	while (timercnt && timers [0]->at <= ev_now)	990	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	991	{
259	struct ev_timer *w = timers [0];	992	struct ev_timer *w = timers [0];
260		993
		994	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		995
261	/* first reschedule timer */	996	/* first reschedule or stop timer */
262	if (w->repeat)	997	if (w->repeat)
263	{	998	{
264	if (w->is_abs)	999	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;	1000
266	else
267	w->at = ev_now + w->repeat;	1001	((WT)w)->at += w->repeat;
		1002	if (((WT)w)->at < mn_now)
		1003	((WT)w)->at = mn_now;
268		1004
269	downheap (0);	1005	downheap ((WT *)timers, timercnt, 0);
270	}	1006	}
271	else	1007	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	1008	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		1009
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	1010	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1011	}
		1012	}
		1013
		1014	#if EV_PERIODICS
		1015	static void
		1016	periodics_reify (EV_P)
		1017	{
		1018	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
275	}	1019	{
276	}	1020	struct ev_periodic *w = periodics [0];
277		1021
278	int ev_loop_done;	1022	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
279		1023
		1024	/* first reschedule or stop timer */
		1025	if (w->reschedule_cb)
		1026	{
		1027	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1028
		1029	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1030	downheap ((WT *)periodics, periodiccnt, 0);
		1031	}
		1032	else if (w->interval)
		1033	{
		1034	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1035	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1036	downheap ((WT *)periodics, periodiccnt, 0);
		1037	}
		1038	else
		1039	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1040
		1041	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1042	}
		1043	}
		1044
		1045	static void
		1046	periodics_reschedule (EV_P)
		1047	{
		1048	int i;
		1049
		1050	/* adjust periodics after time jump */
		1051	for (i = 0; i < periodiccnt; ++i)
		1052	{
		1053	struct ev_periodic *w = periodics [i];
		1054
		1055	if (w->reschedule_cb)
		1056	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1057	else if (w->interval)
		1058	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1059	}
		1060
		1061	/* now rebuild the heap */
		1062	for (i = periodiccnt >> 1; i--; )
		1063	downheap ((WT *)periodics, periodiccnt, i);
		1064	}
		1065	#endif
		1066
		1067	inline int
		1068	time_update_monotonic (EV_P)
		1069	{
		1070	mn_now = get_clock ();
		1071
		1072	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1073	{
		1074	ev_rt_now = rtmn_diff + mn_now;
		1075	return 0;
		1076	}
		1077	else
		1078	{
		1079	now_floor = mn_now;
		1080	ev_rt_now = ev_time ();
		1081	return 1;
		1082	}
		1083	}
		1084
		1085	static void
		1086	time_update (EV_P)
		1087	{
		1088	int i;
		1089
		1090	#if EV_USE_MONOTONIC
		1091	if (expect_true (have_monotonic))
		1092	{
		1093	if (time_update_monotonic (EV_A))
		1094	{
		1095	ev_tstamp odiff = rtmn_diff;
		1096
		1097	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1098	{
		1099	rtmn_diff = ev_rt_now - mn_now;
		1100
		1101	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1102	return; /* all is well */
		1103
		1104	ev_rt_now = ev_time ();
		1105	mn_now = get_clock ();
		1106	now_floor = mn_now;
		1107	}
		1108
		1109	# if EV_PERIODICS
		1110	periodics_reschedule (EV_A);
		1111	# endif
		1112	/* no timer adjustment, as the monotonic clock doesn't jump */
		1113	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1114	}
		1115	}
		1116	else
		1117	#endif
		1118	{
		1119	ev_rt_now = ev_time ();
		1120
		1121	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1122	{
		1123	#if EV_PERIODICS
		1124	periodics_reschedule (EV_A);
		1125	#endif
		1126
		1127	/* adjust timers. this is easy, as the offset is the same for all */
		1128	for (i = 0; i < timercnt; ++i)
		1129	((WT)timers [i])->at += ev_rt_now - mn_now;
		1130	}
		1131
		1132	mn_now = ev_rt_now;
		1133	}
		1134	}
		1135
		1136	void
		1137	ev_ref (EV_P)
		1138	{
		1139	++activecnt;
		1140	}
		1141
		1142	void
		1143	ev_unref (EV_P)
		1144	{
		1145	--activecnt;
		1146	}
		1147
		1148	static int loop_done;
		1149
		1150	void
280	int ev_loop (int flags)	1151	ev_loop (EV_P_ int flags)
281	{	1152	{
282	double block;	1153	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	1154	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
284		1155
285	do	1156	do
286	{	1157	{
		1158	/* queue check watchers (and execute them) */
		1159	if (expect_false (preparecnt))
		1160	{
		1161	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1162	call_pending (EV_A);
		1163	}
		1164
		1165	/* we might have forked, so reify kernel state if necessary */
		1166	if (expect_false (postfork))
		1167	loop_fork (EV_A);
		1168
287	/* update fd-related kernel structures */	1169	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1170	fd_reify (EV_A);
289		1171
290	/* calculate blocking time */	1172	/* calculate blocking time */
		1173
		1174	/* we only need this for !monotonic clock or timers, but as we basically
		1175	always have timers, we just calculate it always */
		1176	#if EV_USE_MONOTONIC
		1177	if (expect_true (have_monotonic))
		1178	time_update_monotonic (EV_A);
		1179	else
		1180	#endif
		1181	{
291	ev_now = ev_time ();	1182	ev_rt_now = ev_time ();
		1183	mn_now = ev_rt_now;
		1184	}
292		1185
293	if (flags & EVLOOP_NONBLOCK)	1186	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	1187	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	1188	else
298	{	1189	{
		1190	block = MAX_BLOCKTIME;
		1191
		1192	if (timercnt)
		1193	{
299	block = timers [0]->at - ev_now + method_fudge;	1194	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
		1195	if (block > to) block = to;
		1196	}
		1197
		1198	#if EV_PERIODICS
		1199	if (periodiccnt)
		1200	{
		1201	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
		1202	if (block > to) block = to;
		1203	}
		1204	#endif
		1205
300	if (block < 0.) block = 0.;	1206	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1207	}
303		1208
304	method_poll (block);	1209	method_poll (EV_A_ block);
305		1210
		1211	/* update ev_rt_now, do magic */
		1212	time_update (EV_A);
		1213
306	/* put pending timers into pendign queue and reschedule them */	1214	/* queue pending timers and reschedule them */
307	timer_reify ();	1215	timers_reify (EV_A); /* relative timers called last */
		1216	#if EV_PERIODICS
		1217	periodics_reify (EV_A); /* absolute timers called first */
		1218	#endif
308		1219
309	ev_now = ev_time ();	1220	/* queue idle watchers unless io or timers are pending */
		1221	if (idlecnt && !any_pending (EV_A))
		1222	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1223
		1224	/* queue check watchers, to be executed first */
		1225	if (checkcnt)
		1226	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1227
310	call_pending ();	1228	call_pending (EV_A);
311	}	1229	}
312	while (!ev_loop_done);	1230	while (activecnt && !loop_done);
313	}
314		1231
315	static void	1232	if (loop_done != 2)
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1233	loop_done = 0;
		1234	}
		1235
		1236	void
		1237	ev_unloop (EV_P_ int how)
		1238	{
		1239	loop_done = how;
		1240	}
		1241
		1242	/*****************************************************************************/
		1243
		1244	inline void
		1245	wlist_add (WL *head, WL elem)
317	{	1246	{
318	elem->next = *head;	1247	elem->next = *head;
319	*head = elem;	1248	*head = elem;
320	}	1249	}
321		1250
322	static void	1251	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1252	wlist_del (WL *head, WL elem)
324	{	1253	{
325	while (*head)	1254	while (*head)
326	{	1255	{
327	if (*head == elem)	1256	if (*head == elem)
328	{	1257	{
…		…
332		1261
333	head = &(*head)->next;	1262	head = &(*head)->next;
334	}	1263	}
335	}	1264	}
336		1265
337	static void	1266	inline void
338	ev_start (struct ev_watcher *w, int active)	1267	ev_clear_pending (EV_P_ W w)
339	{	1268	{
		1269	if (w->pending)
		1270	{
		1271	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	1272	w->pending = 0;
		1273	}
		1274	}
		1275
		1276	inline void
		1277	ev_start (EV_P_ W w, int active)
		1278	{
		1279	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1280	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1281
341	w->active = active;	1282	w->active = active;
		1283	ev_ref (EV_A);
342	}	1284	}
343		1285
344	static void	1286	inline void
345	ev_stop (struct ev_watcher *w)	1287	ev_stop (EV_P_ W w)
346	{	1288	{
347	if (w->pending)	1289	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	1290	w->active = 0;
351	/* nop */
352	}	1291	}
353		1292
		1293	/*****************************************************************************/
		1294
354	void	1295	void
355	evio_start (struct ev_io *w)	1296	ev_io_start (EV_P_ struct ev_io *w)
356	{	1297	{
		1298	int fd = w->fd;
		1299
357	if (ev_is_active (w))	1300	if (ev_is_active (w))
358	return;	1301	return;
359		1302
360	int fd = w->fd;	1303	assert (("ev_io_start called with negative fd", fd >= 0));
361		1304
362	ev_start ((struct ev_watcher *)w, 1);	1305	ev_start (EV_A_ (W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1306	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1307	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		1308
366	++fdchangecnt;	1309	fd_change (EV_A_ fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	1310	}
370		1311
371	void	1312	void
372	evio_stop (struct ev_io *w)	1313	ev_io_stop (EV_P_ struct ev_io *w)
373	{	1314	{
		1315	ev_clear_pending (EV_A_ (W)w);
374	if (!ev_is_active (w))	1316	if (!ev_is_active (w))
375	return;	1317	return;
376		1318
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1319	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		1320
380	++fdchangecnt;	1321	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	1322	ev_stop (EV_A_ (W)w);
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}
384		1323
		1324	fd_change (EV_A_ w->fd);
		1325	}
		1326
385	void	1327	void
386	evtimer_start (struct ev_timer *w)	1328	ev_timer_start (EV_P_ struct ev_timer *w)
387	{	1329	{
388	if (ev_is_active (w))	1330	if (ev_is_active (w))
389	return;	1331	return;
390		1332
391	if (w->is_abs)	1333	((WT)w)->at += mn_now;
		1334
		1335	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1336
		1337	ev_start (EV_A_ (W)w, ++timercnt);
		1338	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1339	timers [timercnt - 1] = w;
		1340	upheap ((WT *)timers, timercnt - 1);
		1341
		1342	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1343	}
		1344
		1345	void
		1346	ev_timer_stop (EV_P_ struct ev_timer *w)
		1347	{
		1348	ev_clear_pending (EV_A_ (W)w);
		1349	if (!ev_is_active (w))
		1350	return;
		1351
		1352	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1353
		1354	if (((W)w)->active < timercnt--)
		1355	{
		1356	timers [((W)w)->active - 1] = timers [timercnt];
		1357	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
392	{	1358	}
393	/* this formula differs from the one in timer_reify becuse we do not round up */	1359
		1360	((WT)w)->at -= mn_now;
		1361
		1362	ev_stop (EV_A_ (W)w);
		1363	}
		1364
		1365	void
		1366	ev_timer_again (EV_P_ struct ev_timer *w)
		1367	{
		1368	if (ev_is_active (w))
		1369	{
394	if (w->repeat)	1370	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1371	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
		1372	else
		1373	ev_timer_stop (EV_A_ w);
		1374	}
		1375	else if (w->repeat)
		1376	ev_timer_start (EV_A_ w);
		1377	}
		1378
		1379	#if EV_PERIODICS
		1380	void
		1381	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1382	{
		1383	if (ev_is_active (w))
		1384	return;
		1385
		1386	if (w->reschedule_cb)
		1387	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1388	else if (w->interval)
396	}	1389	{
		1390	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1391	/* this formula differs from the one in periodic_reify because we do not always round up */
		1392	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1393	}
		1394
		1395	ev_start (EV_A_ (W)w, ++periodiccnt);
		1396	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1397	periodics [periodiccnt - 1] = w;
		1398	upheap ((WT *)periodics, periodiccnt - 1);
		1399
		1400	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1401	}
		1402
		1403	void
		1404	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1405	{
		1406	ev_clear_pending (EV_A_ (W)w);
		1407	if (!ev_is_active (w))
		1408	return;
		1409
		1410	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1411
		1412	if (((W)w)->active < periodiccnt--)
		1413	{
		1414	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1415	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1416	}
		1417
		1418	ev_stop (EV_A_ (W)w);
		1419	}
		1420
		1421	void
		1422	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1423	{
		1424	/* TODO: use adjustheap and recalculation */
		1425	ev_periodic_stop (EV_A_ w);
		1426	ev_periodic_start (EV_A_ w);
		1427	}
		1428	#endif
		1429
		1430	void
		1431	ev_idle_start (EV_P_ struct ev_idle *w)
		1432	{
		1433	if (ev_is_active (w))
		1434	return;
		1435
		1436	ev_start (EV_A_ (W)w, ++idlecnt);
		1437	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1438	idles [idlecnt - 1] = w;
		1439	}
		1440
		1441	void
		1442	ev_idle_stop (EV_P_ struct ev_idle *w)
		1443	{
		1444	ev_clear_pending (EV_A_ (W)w);
		1445	if (ev_is_active (w))
		1446	return;
		1447
		1448	idles [((W)w)->active - 1] = idles [--idlecnt];
		1449	ev_stop (EV_A_ (W)w);
		1450	}
		1451
		1452	void
		1453	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1454	{
		1455	if (ev_is_active (w))
		1456	return;
		1457
		1458	ev_start (EV_A_ (W)w, ++preparecnt);
		1459	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1460	prepares [preparecnt - 1] = w;
		1461	}
		1462
		1463	void
		1464	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1465	{
		1466	ev_clear_pending (EV_A_ (W)w);
		1467	if (ev_is_active (w))
		1468	return;
		1469
		1470	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1471	ev_stop (EV_A_ (W)w);
		1472	}
		1473
		1474	void
		1475	ev_check_start (EV_P_ struct ev_check *w)
		1476	{
		1477	if (ev_is_active (w))
		1478	return;
		1479
		1480	ev_start (EV_A_ (W)w, ++checkcnt);
		1481	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1482	checks [checkcnt - 1] = w;
		1483	}
		1484
		1485	void
		1486	ev_check_stop (EV_P_ struct ev_check *w)
		1487	{
		1488	ev_clear_pending (EV_A_ (W)w);
		1489	if (!ev_is_active (w))
		1490	return;
		1491
		1492	checks [((W)w)->active - 1] = checks [--checkcnt];
		1493	ev_stop (EV_A_ (W)w);
		1494	}
		1495
		1496	#ifndef SA_RESTART
		1497	# define SA_RESTART 0
		1498	#endif
		1499
		1500	void
		1501	ev_signal_start (EV_P_ struct ev_signal *w)
		1502	{
		1503	#if EV_MULTIPLICITY
		1504	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1505	#endif
		1506	if (ev_is_active (w))
		1507	return;
		1508
		1509	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1510
		1511	ev_start (EV_A_ (W)w, 1);
		1512	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1513	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1514
		1515	if (!((WL)w)->next)
		1516	{
		1517	#if WIN32
		1518	signal (w->signum, sighandler);
		1519	#else
		1520	struct sigaction sa;
		1521	sa.sa_handler = sighandler;
		1522	sigfillset (&sa.sa_mask);
		1523	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1524	sigaction (w->signum, &sa, 0);
		1525	#endif
		1526	}
		1527	}
		1528
		1529	void
		1530	ev_signal_stop (EV_P_ struct ev_signal *w)
		1531	{
		1532	ev_clear_pending (EV_A_ (W)w);
		1533	if (!ev_is_active (w))
		1534	return;
		1535
		1536	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1537	ev_stop (EV_A_ (W)w);
		1538
		1539	if (!signals [w->signum - 1].head)
		1540	signal (w->signum, SIG_DFL);
		1541	}
		1542
		1543	void
		1544	ev_child_start (EV_P_ struct ev_child *w)
		1545	{
		1546	#if EV_MULTIPLICITY
		1547	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1548	#endif
		1549	if (ev_is_active (w))
		1550	return;
		1551
		1552	ev_start (EV_A_ (W)w, 1);
		1553	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1554	}
		1555
		1556	void
		1557	ev_child_stop (EV_P_ struct ev_child *w)
		1558	{
		1559	ev_clear_pending (EV_A_ (W)w);
		1560	if (!ev_is_active (w))
		1561	return;
		1562
		1563	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1564	ev_stop (EV_A_ (W)w);
		1565	}
		1566
		1567	/*****************************************************************************/
		1568
		1569	struct ev_once
		1570	{
		1571	struct ev_io io;
		1572	struct ev_timer to;
		1573	void (*cb)(int revents, void *arg);
		1574	void *arg;
		1575	};
		1576
		1577	static void
		1578	once_cb (EV_P_ struct ev_once *once, int revents)
		1579	{
		1580	void (*cb)(int revents, void *arg) = once->cb;
		1581	void *arg = once->arg;
		1582
		1583	ev_io_stop (EV_A_ &once->io);
		1584	ev_timer_stop (EV_A_ &once->to);
		1585	ev_free (once);
		1586
		1587	cb (revents, arg);
		1588	}
		1589
		1590	static void
		1591	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1592	{
		1593	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1594	}
		1595
		1596	static void
		1597	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1598	{
		1599	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1600	}
		1601
		1602	void
		1603	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1604	{
		1605	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1606
		1607	if (!once)
		1608	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
397	else	1609	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	}	1610	{
		1611	once->cb = cb;
		1612	once->arg = arg;
417		1613
418	ev_stop ((struct ev_watcher *)w);	1614	ev_init (&once->io, once_cb_io);
419	}	1615	if (fd >= 0)
		1616	{
		1617	ev_io_set (&once->io, fd, events);
		1618	ev_io_start (EV_A_ &once->io);
		1619	}
420		1620
421	void	1621	ev_init (&once->to, once_cb_to);
422	evsignal_start (struct ev_signal *w)	1622	if (timeout >= 0.)
423	{	1623	{
424	if (ev_is_active (w))	1624	ev_timer_set (&once->to, timeout, 0.);
425	return;	1625	ev_timer_start (EV_A_ &once->to);
426		1626	}
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	{	1627	}
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	}	1628	}
484		1629
		1630	#ifdef __cplusplus
		1631	}
485	#endif	1632	#endif
486		1633
487
488
489

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