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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 1.80 by root, Fri Nov 9 15:30:59 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#ifndef EV_STANDALONE
		32	# include "config.h"
		33
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
		56
1	#include <math.h>	57	#include <math.h>
2	#include <stdlib.h>	58	#include <stdlib.h>
		59	#include <fcntl.h>
		60	#include <stddef.h>
3		61
4	#include <stdio.h>	62	#include <stdio.h>
5		63
		64	#include <assert.h>
6	#include <errno.h>	65	#include <errno.h>
7	#include <sys/time.h>	66	#include <sys/types.h>
8	#include <time.h>	67	#include <time.h>
9		68
		69	#include <signal.h>
		70
		71	#ifndef WIN32
		72	# include <unistd.h>
		73	# include <sys/time.h>
		74	# include <sys/wait.h>
		75	#endif
		76	/**/
		77
		78	#ifndef EV_USE_MONOTONIC
		79	# define EV_USE_MONOTONIC 1
		80	#endif
		81
		82	#ifndef EV_USE_SELECT
		83	# define EV_USE_SELECT 1
		84	#endif
		85
		86	#ifndef EV_USE_POLL
		87	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		88	#endif
		89
		90	#ifndef EV_USE_EPOLL
		91	# define EV_USE_EPOLL 0
		92	#endif
		93
		94	#ifndef EV_USE_KQUEUE
		95	# define EV_USE_KQUEUE 0
		96	#endif
		97
		98	#ifndef EV_USE_WIN32
		99	# ifdef WIN32
		100	# define EV_USE_WIN32 0 /* it does not exist, use select */
		101	# undef EV_USE_SELECT
		102	# define EV_USE_SELECT 1
		103	# else
		104	# define EV_USE_WIN32 0
		105	# endif
		106	#endif
		107
		108	#ifndef EV_USE_REALTIME
		109	# define EV_USE_REALTIME 1
		110	#endif
		111
		112	/**/
		113
10	#ifdef CLOCK_MONOTONIC	114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	116	# define EV_USE_MONOTONIC 0
12	#endif	117	#endif
13		118
14	#define HAVE_EPOLL 1	119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	121	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	122	#endif
17		123
18	#define MAX_BLOCKTIME 60.	124	/**/
		125
		126	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		127	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		128	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		129	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
19		130
20	#include "ev.h"	131	#include "ev.h"
21		132
		133	#if __GNUC__ >= 3
		134	# define expect(expr,value) __builtin_expect ((expr),(value))
		135	# define inline inline
		136	#else
		137	# define expect(expr,value) (expr)
		138	# define inline static
		139	#endif
		140
		141	#define expect_false(expr) expect ((expr) != 0, 0)
		142	#define expect_true(expr) expect ((expr) != 0, 1)
		143
		144	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		145	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		146
22	struct ev_watcher {	147	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	148	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	149	typedef struct ev_watcher_time *WT;
28	};
29		150
30	ev_tstamp ev_now;	151	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
31	int ev_method;
32		152
33	static int have_monotonic; /* runtime */	153	#include "ev_win32.c"
34		154
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	155	/*****************************************************************************/
36	static void (*method_reify)(void);
37	static void (*method_poll)(ev_tstamp timeout);
38		156
39	ev_tstamp	157	static void (*syserr_cb)(const char *msg);
		158
		159	void ev_set_syserr_cb (void (*cb)(const char *msg))
		160	{
		161	syserr_cb = cb;
		162	}
		163
		164	static void
		165	syserr (const char *msg)
		166	{
		167	if (!msg)
		168	msg = "(libev) system error";
		169
		170	if (syserr_cb)
		171	syserr_cb (msg);
		172	else
		173	{
		174	perror (msg);
		175	abort ();
		176	}
		177	}
		178
		179	static void *(*alloc)(void *ptr, long size);
		180
		181	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		182	{
		183	alloc = cb;
		184	}
		185
		186	static void *
		187	ev_realloc (void *ptr, long size)
		188	{
		189	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		190
		191	if (!ptr && size)
		192	{
		193	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		194	abort ();
		195	}
		196
		197	return ptr;
		198	}
		199
		200	#define ev_malloc(size) ev_realloc (0, (size))
		201	#define ev_free(ptr) ev_realloc ((ptr), 0)
		202
		203	/*****************************************************************************/
		204
		205	typedef struct
		206	{
		207	WL head;
		208	unsigned char events;
		209	unsigned char reify;
		210	} ANFD;
		211
		212	typedef struct
		213	{
		214	W w;
		215	int events;
		216	} ANPENDING;
		217
		218	#if EV_MULTIPLICITY
		219
		220	struct ev_loop
		221	{
		222	#define VAR(name,decl) decl;
		223	#include "ev_vars.h"
		224	#undef VAR
		225	};
		226	#include "ev_wrap.h"
		227
		228	struct ev_loop default_loop_struct;
		229	static struct ev_loop *default_loop;
		230
		231	#else
		232
		233	#define VAR(name,decl) static decl;
		234	#include "ev_vars.h"
		235	#undef VAR
		236
		237	static int default_loop;
		238
		239	#endif
		240
		241	/*****************************************************************************/
		242
		243	inline ev_tstamp
40	ev_time (void)	244	ev_time (void)
41	{	245	{
42	#if HAVE_REALTIME	246	#if EV_USE_REALTIME
43	struct timespec ts;	247	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	248	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	249	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	250	#else
47	struct timeval tv;	251	struct timeval tv;
48	gettimeofday (&tv, 0);	252	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	253	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	254	#endif
51	}	255	}
52		256
53	static ev_tstamp	257	inline ev_tstamp
54	get_clock (void)	258	get_clock (void)
55	{	259	{
56	#if HAVE_MONOTONIC	260	#if EV_USE_MONOTONIC
57	if (have_monotonic)	261	if (expect_true (have_monotonic))
58	{	262	{
59	struct timespec ts;	263	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	264	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	265	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	266	}
63	#endif	267	#endif
64		268
65	return ev_time ();	269	return ev_time ();
66	}	270	}
67		271
		272	ev_tstamp
		273	ev_now (EV_P)
		274	{
		275	return rt_now;
		276	}
		277
		278	#define array_roundsize(type,n) ((n) | 4 & ~3)
		279
68	#define array_needsize(base,cur,cnt,init) \	280	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	281	if (expect_false ((cnt) > cur)) \
70	{ \	282	{ \
71	int newcnt = cur ? cur << 1 : 16; \	283	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	284	do \
		285	{ \
		286	newcnt = array_roundsize (type, newcnt << 1); \
		287	} \
		288	while ((cnt) > newcnt); \
		289	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	290	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
74	init (base + cur, newcnt - cur); \	291	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	292	cur = newcnt; \
76	}	293	}
77		294
78	typedef struct	295	#define array_slim(type,stem) \
79	{	296	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
80	struct ev_io *head;	297	{ \
81	unsigned char wev, rev; /* want, received event set */	298	stem ## max = array_roundsize (stem ## cnt >> 1); \
82	} ANFD;	299	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		300	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		301	}
83		302
84	static ANFD *anfds;	303	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
85	static int anfdmax;	304	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		305	#define array_free_microshit(stem) \
		306	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
86		307
87	static int *fdchanges;	308	#define array_free(stem, idx) \
88	static int fdchangemax, fdchangecnt;	309	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		310
		311	/*****************************************************************************/
89		312
90	static void	313	static void
91	anfds_init (ANFD *base, int count)	314	anfds_init (ANFD *base, int count)
92	{	315	{
93	while (count--)	316	while (count--)
94	{	317	{
95	base->head = 0;	318	base->head = 0;
96	base->wev = base->rev = EV_NONE;	319	base->events = EV_NONE;
		320	base->reify = 0;
		321
97	++base;	322	++base;
98	}	323	}
99	}	324	}
100		325
101	typedef struct	326	void
		327	ev_feed_event (EV_P_ void *w, int revents)
102	{	328	{
103	struct ev_watcher *w;	329	W w_ = (W)w;
104	int events;
105	} ANPENDING;
106		330
107	static ANPENDING *pendings;	331	if (w_->pending)
108	static int pendingmax, pendingcnt;	332	{
		333	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		334	return;
		335	}
109		336
110	static void
111	event (struct ev_watcher *w, int events)
112	{
113	w->pending = ++pendingcnt;	337	w_->pending = ++pendingcnt [ABSPRI (w_)];
114	array_needsize (pendings, pendingmax, pendingcnt, );	338	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
115	pendings [pendingcnt - 1].w = w;	339	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
116	pendings [pendingcnt - 1].events = events;	340	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
117	}	341	}
118		342
119	static void	343	static void
		344	queue_events (EV_P_ W *events, int eventcnt, int type)
		345	{
		346	int i;
		347
		348	for (i = 0; i < eventcnt; ++i)
		349	ev_feed_event (EV_A_ events [i], type);
		350	}
		351
		352	inline void
120	fd_event (int fd, int events)	353	fd_event (EV_P_ int fd, int revents)
121	{	354	{
122	ANFD *anfd = anfds + fd;	355	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	356	struct ev_io *w;
124		357
125	for (w = anfd->head; w; w = w->next)	358	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
126	{	359	{
127	int ev = w->events & events;	360	int ev = w->events & revents;
128		361
129	if (ev)	362	if (ev)
130	event ((struct ev_watcher *)w, ev);	363	ev_feed_event (EV_A_ (W)w, ev);
		364	}
		365	}
		366
		367	void
		368	ev_feed_fd_event (EV_P_ int fd, int revents)
		369	{
		370	fd_event (EV_A_ fd, revents);
		371	}
		372
		373	/*****************************************************************************/
		374
		375	static void
		376	fd_reify (EV_P)
		377	{
		378	int i;
		379
		380	for (i = 0; i < fdchangecnt; ++i)
		381	{
		382	int fd = fdchanges [i];
		383	ANFD *anfd = anfds + fd;
		384	struct ev_io *w;
		385
		386	int events = 0;
		387
		388	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		389	events |= w->events;
		390
		391	anfd->reify = 0;
		392
		393	method_modify (EV_A_ fd, anfd->events, events);
		394	anfd->events = events;
		395	}
		396
		397	fdchangecnt = 0;
		398	}
		399
		400	static void
		401	fd_change (EV_P_ int fd)
		402	{
		403	if (anfds [fd].reify)
		404	return;
		405
		406	anfds [fd].reify = 1;
		407
		408	++fdchangecnt;
		409	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		410	fdchanges [fdchangecnt - 1] = fd;
		411	}
		412
		413	static void
		414	fd_kill (EV_P_ int fd)
		415	{
		416	struct ev_io *w;
		417
		418	while ((w = (struct ev_io *)anfds [fd].head))
		419	{
		420	ev_io_stop (EV_A_ w);
		421	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		422	}
		423	}
		424
		425	static int
		426	fd_valid (int fd)
		427	{
		428	#ifdef WIN32
		429	return !!win32_get_osfhandle (fd);
		430	#else
		431	return fcntl (fd, F_GETFD) != -1;
		432	#endif
		433	}
		434
		435	/* called on EBADF to verify fds */
		436	static void
		437	fd_ebadf (EV_P)
		438	{
		439	int fd;
		440
		441	for (fd = 0; fd < anfdmax; ++fd)
		442	if (anfds [fd].events)
		443	if (!fd_valid (fd) == -1 && errno == EBADF)
		444	fd_kill (EV_A_ fd);
		445	}
		446
		447	/* called on ENOMEM in select/poll to kill some fds and retry */
		448	static void
		449	fd_enomem (EV_P)
		450	{
		451	int fd;
		452
		453	for (fd = anfdmax; fd--; )
		454	if (anfds [fd].events)
		455	{
		456	fd_kill (EV_A_ fd);
		457	return;
131	}	458	}
132	}	459	}
133		460
134	static struct ev_timer **timers;	461	/* usually called after fork if method needs to re-arm all fds from scratch */
135	static int timermax, timercnt;
136
137	static void	462	static void
138	upheap (int k)	463	fd_rearm_all (EV_P)
139	{	464	{
140	struct ev_timer *w = timers [k];	465	int fd;
141		466
		467	/* this should be highly optimised to not do anything but set a flag */
		468	for (fd = 0; fd < anfdmax; ++fd)
		469	if (anfds [fd].events)
		470	{
		471	anfds [fd].events = 0;
		472	fd_change (EV_A_ fd);
		473	}
		474	}
		475
		476	/*****************************************************************************/
		477
		478	static void
		479	upheap (WT *heap, int k)
		480	{
		481	WT w = heap [k];
		482
142	while (k && timers [k >> 1]->at > w->at)	483	while (k && heap [k >> 1]->at > w->at)
143	{	484	{
144	timers [k] = timers [k >> 1];	485	heap [k] = heap [k >> 1];
145	timers [k]->active = k + 1;	486	((W)heap [k])->active = k + 1;
146	k >>= 1;	487	k >>= 1;
147	}	488	}
148		489
149	timers [k] = w;	490	heap [k] = w;
150	timers [k]->active = k + 1;	491	((W)heap [k])->active = k + 1;
151		492
152	}	493	}
153		494
154	static void	495	static void
155	downheap (int k)	496	downheap (WT *heap, int N, int k)
156	{	497	{
157	struct ev_timer *w = timers [k];	498	WT w = heap [k];
158		499
159	while (k < (timercnt >> 1))	500	while (k < (N >> 1))
160	{	501	{
161	int j = k << 1;	502	int j = k << 1;
162		503
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	504	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
164	++j;	505	++j;
165		506
166	if (w->at <= timers [j]->at)	507	if (w->at <= heap [j]->at)
167	break;	508	break;
168		509
169	timers [k] = timers [j];	510	heap [k] = heap [j];
170	timers [k]->active = k + 1;	511	((W)heap [k])->active = k + 1;
171	k = j;	512	k = j;
172	}	513	}
173		514
174	timers [k] = w;	515	heap [k] = w;
175	timers [k]->active = k + 1;	516	((W)heap [k])->active = k + 1;
176	}	517	}
177		518
178	static struct ev_signal **signals;	519	/*****************************************************************************/
		520
		521	typedef struct
		522	{
		523	WL head;
		524	sig_atomic_t volatile gotsig;
		525	} ANSIG;
		526
		527	static ANSIG *signals;
179	static int signalmax, signalcnt;	528	static int signalmax;
180		529
		530	static int sigpipe [2];
		531	static sig_atomic_t volatile gotsig;
		532	static struct ev_io sigev;
		533
181	static void	534	static void
182	signals_init (struct ev_signal **base, int count)	535	signals_init (ANSIG *base, int count)
183	{	536	{
184	while (count--)	537	while (count--)
185	*base++ = 0;	538	{
186	}	539	base->head = 0;
		540	base->gotsig = 0;
187		541
		542	++base;
		543	}
		544	}
		545
		546	static void
		547	sighandler (int signum)
		548	{
		549	#if WIN32
		550	signal (signum, sighandler);
		551	#endif
		552
		553	signals [signum - 1].gotsig = 1;
		554
		555	if (!gotsig)
		556	{
		557	int old_errno = errno;
		558	gotsig = 1;
		559	#ifdef WIN32
		560	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		561	#else
		562	write (sigpipe [1], &signum, 1);
		563	#endif
		564	errno = old_errno;
		565	}
		566	}
		567
		568	void
		569	ev_feed_signal_event (EV_P_ int signum)
		570	{
		571	WL w;
		572
		573	#if EV_MULTIPLICITY
		574	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		575	#endif
		576
		577	--signum;
		578
		579	if (signum < 0 || signum >= signalmax)
		580	return;
		581
		582	signals [signum].gotsig = 0;
		583
		584	for (w = signals [signum].head; w; w = w->next)
		585	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		586	}
		587
		588	static void
		589	sigcb (EV_P_ struct ev_io *iow, int revents)
		590	{
		591	int signum;
		592
		593	#ifdef WIN32
		594	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		595	#else
		596	read (sigpipe [0], &revents, 1);
		597	#endif
		598	gotsig = 0;
		599
		600	for (signum = signalmax; signum--; )
		601	if (signals [signum].gotsig)
		602	ev_feed_signal_event (EV_A_ signum + 1);
		603	}
		604
		605	static void
		606	siginit (EV_P)
		607	{
		608	#ifndef WIN32
		609	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		610	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		611
		612	/* rather than sort out wether we really need nb, set it */
		613	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		614	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		615	#endif
		616
		617	ev_io_set (&sigev, sigpipe [0], EV_READ);
		618	ev_io_start (EV_A_ &sigev);
		619	ev_unref (EV_A); /* child watcher should not keep loop alive */
		620	}
		621
		622	/*****************************************************************************/
		623
		624	static struct ev_child *childs [PID_HASHSIZE];
		625
		626	#ifndef WIN32
		627
		628	static struct ev_signal childev;
		629
		630	#ifndef WCONTINUED
		631	# define WCONTINUED 0
		632	#endif
		633
		634	static void
		635	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		636	{
		637	struct ev_child *w;
		638
		639	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		640	if (w->pid == pid || !w->pid)
		641	{
		642	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		643	w->rpid = pid;
		644	w->rstatus = status;
		645	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		646	}
		647	}
		648
		649	static void
		650	childcb (EV_P_ struct ev_signal *sw, int revents)
		651	{
		652	int pid, status;
		653
		654	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		655	{
		656	/* make sure we are called again until all childs have been reaped */
		657	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		658
		659	child_reap (EV_A_ sw, pid, pid, status);
		660	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		661	}
		662	}
		663
		664	#endif
		665
		666	/*****************************************************************************/
		667
		668	#if EV_USE_KQUEUE
		669	# include "ev_kqueue.c"
		670	#endif
188	#if HAVE_EPOLL	671	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	672	# include "ev_epoll.c"
190	#endif	673	#endif
		674	#if EV_USE_POLL
		675	# include "ev_poll.c"
		676	#endif
191	#if HAVE_SELECT	677	#if EV_USE_SELECT
192	# include "ev_select.c"	678	# include "ev_select.c"
193	#endif	679	#endif
194		680
195	int ev_init (int flags)	681	int
		682	ev_version_major (void)
196	{	683	{
		684	return EV_VERSION_MAJOR;
		685	}
		686
		687	int
		688	ev_version_minor (void)
		689	{
		690	return EV_VERSION_MINOR;
		691	}
		692
		693	/* return true if we are running with elevated privileges and should ignore env variables */
		694	static int
		695	enable_secure (void)
		696	{
		697	#ifdef WIN32
		698	return 0;
		699	#else
		700	return getuid () != geteuid ()
		701	|| getgid () != getegid ();
		702	#endif
		703	}
		704
		705	int
		706	ev_method (EV_P)
		707	{
		708	return method;
		709	}
		710
		711	static void
		712	loop_init (EV_P_ int methods)
		713	{
		714	if (!method)
		715	{
197	#if HAVE_MONOTONIC	716	#if EV_USE_MONOTONIC
198	{	717	{
199	struct timespec ts;	718	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	719	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	720	have_monotonic = 1;
202	}	721	}
203	#endif	722	#endif
204		723
205	ev_now = ev_time ();	724	rt_now = ev_time ();
		725	mn_now = get_clock ();
		726	now_floor = mn_now;
		727	rtmn_diff = rt_now - mn_now;
206		728
		729	if (methods == EVMETHOD_AUTO)
		730	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		731	methods = atoi (getenv ("LIBEV_METHODS"));
		732	else
		733	methods = EVMETHOD_ANY;
		734
		735	method = 0;
		736	#if EV_USE_WIN32
		737	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		738	#endif
		739	#if EV_USE_KQUEUE
		740	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		741	#endif
207	#if HAVE_EPOLL	742	#if EV_USE_EPOLL
208	if (epoll_init (flags))	743	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
209	return ev_method;
210	#endif	744	#endif
		745	#if EV_USE_POLL
		746	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		747	#endif
211	#if HAVE_SELECT	748	#if EV_USE_SELECT
212	if (select_init (flags))	749	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
213	return ev_method;
214	#endif	750	#endif
215		751
216	ev_method = EVMETHOD_NONE;	752	ev_watcher_init (&sigev, sigcb);
217	return ev_method;	753	ev_set_priority (&sigev, EV_MAXPRI);
		754	}
218	}	755	}
219		756
220	void ev_prefork (void)	757	void
221	{	758	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	{	759	{
238	int i;	760	int i;
239		761
240	for (i = 0; i < pendingcnt; ++i)	762	#if EV_USE_WIN32
		763	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		764	#endif
		765	#if EV_USE_KQUEUE
		766	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		767	#endif
		768	#if EV_USE_EPOLL
		769	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		770	#endif
		771	#if EV_USE_POLL
		772	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		773	#endif
		774	#if EV_USE_SELECT
		775	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		776	#endif
		777
		778	for (i = NUMPRI; i--; )
		779	array_free (pending, [i]);
		780
		781	/* have to use the microsoft-never-gets-it-right macro */
		782	array_free_microshit (fdchange);
		783	array_free_microshit (timer);
		784	array_free_microshit (periodic);
		785	array_free_microshit (idle);
		786	array_free_microshit (prepare);
		787	array_free_microshit (check);
		788
		789	method = 0;
		790	}
		791
		792	static void
		793	loop_fork (EV_P)
		794	{
		795	#if EV_USE_EPOLL
		796	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		797	#endif
		798	#if EV_USE_KQUEUE
		799	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		800	#endif
		801
		802	if (ev_is_active (&sigev))
		803	{
		804	/* default loop */
		805
		806	ev_ref (EV_A);
		807	ev_io_stop (EV_A_ &sigev);
		808	close (sigpipe [0]);
		809	close (sigpipe [1]);
		810
		811	while (pipe (sigpipe))
		812	syserr ("(libev) error creating pipe");
		813
		814	siginit (EV_A);
241	{	815	}
242	ANPENDING *p = pendings + i;
243		816
244	if (p->w)	817	postfork = 0;
		818	}
		819
		820	#if EV_MULTIPLICITY
		821	struct ev_loop *
		822	ev_loop_new (int methods)
		823	{
		824	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		825
		826	memset (loop, 0, sizeof (struct ev_loop));
		827
		828	loop_init (EV_A_ methods);
		829
		830	if (ev_method (EV_A))
		831	return loop;
		832
		833	return 0;
		834	}
		835
		836	void
		837	ev_loop_destroy (EV_P)
		838	{
		839	loop_destroy (EV_A);
		840	ev_free (loop);
		841	}
		842
		843	void
		844	ev_loop_fork (EV_P)
		845	{
		846	postfork = 1;
		847	}
		848
		849	#endif
		850
		851	#if EV_MULTIPLICITY
		852	struct ev_loop *
		853	#else
		854	int
		855	#endif
		856	ev_default_loop (int methods)
		857	{
		858	if (sigpipe [0] == sigpipe [1])
		859	if (pipe (sigpipe))
		860	return 0;
		861
		862	if (!default_loop)
		863	{
		864	#if EV_MULTIPLICITY
		865	struct ev_loop *loop = default_loop = &default_loop_struct;
		866	#else
		867	default_loop = 1;
		868	#endif
		869
		870	loop_init (EV_A_ methods);
		871
		872	if (ev_method (EV_A))
245	{	873	{
246	p->w->pending = 0;	874	siginit (EV_A);
247	p->w->cb (p->w, p->events);	875
		876	#ifndef WIN32
		877	ev_signal_init (&childev, childcb, SIGCHLD);
		878	ev_set_priority (&childev, EV_MAXPRI);
		879	ev_signal_start (EV_A_ &childev);
		880	ev_unref (EV_A); /* child watcher should not keep loop alive */
		881	#endif
248	}	882	}
		883	else
		884	default_loop = 0;
		885	}
		886
		887	return default_loop;
		888	}
		889
		890	void
		891	ev_default_destroy (void)
		892	{
		893	#if EV_MULTIPLICITY
		894	struct ev_loop *loop = default_loop;
		895	#endif
		896
		897	#ifndef WIN32
		898	ev_ref (EV_A); /* child watcher */
		899	ev_signal_stop (EV_A_ &childev);
		900	#endif
		901
		902	ev_ref (EV_A); /* signal watcher */
		903	ev_io_stop (EV_A_ &sigev);
		904
		905	close (sigpipe [0]); sigpipe [0] = 0;
		906	close (sigpipe [1]); sigpipe [1] = 0;
		907
		908	loop_destroy (EV_A);
		909	}
		910
		911	void
		912	ev_default_fork (void)
		913	{
		914	#if EV_MULTIPLICITY
		915	struct ev_loop *loop = default_loop;
		916	#endif
		917
		918	if (method)
		919	postfork = 1;
		920	}
		921
		922	/*****************************************************************************/
		923
		924	static int
		925	any_pending (EV_P)
		926	{
		927	int pri;
		928
		929	for (pri = NUMPRI; pri--; )
		930	if (pendingcnt [pri])
		931	return 1;
		932
		933	return 0;
		934	}
		935
		936	static void
		937	call_pending (EV_P)
		938	{
		939	int pri;
		940
		941	for (pri = NUMPRI; pri--; )
		942	while (pendingcnt [pri])
		943	{
		944	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		945
		946	if (p->w)
		947	{
		948	p->w->pending = 0;
		949	p->w->cb (EV_A_ p->w, p->events);
		950	}
249	}	951	}
250
251	pendingcnt = 0;
252	}	952	}
253		953
254	static void	954	static void
255	timer_reify (void)	955	timers_reify (EV_P)
256	{	956	{
257	while (timercnt && timers [0]->at <= ev_now)	957	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	958	{
259	struct ev_timer *w = timers [0];	959	struct ev_timer *w = timers [0];
260		960
		961	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		962
261	/* first reschedule timer */	963	/* first reschedule or stop timer */
262	if (w->repeat)	964	if (w->repeat)
263	{	965	{
264	if (w->is_abs)	966	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
265	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
266	else
267	w->at = ev_now + w->repeat;	967	((WT)w)->at = mn_now + w->repeat;
268		968	downheap ((WT *)timers, timercnt, 0);
269	downheap (0);
270	}	969	}
271	else	970	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	971	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		972
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	973	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		974	}
		975	}
		976
		977	static void
		978	periodics_reify (EV_P)
		979	{
		980	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
275	}	981	{
276	}	982	struct ev_periodic *w = periodics [0];
277		983
278	int ev_loop_done;	984	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
279		985
		986	/* first reschedule or stop timer */
		987	if (w->reschedule_cb)
		988	{
		989	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, rt_now + 0.0001);
		990
		991	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > rt_now));
		992	downheap ((WT *)periodics, periodiccnt, 0);
		993	}
		994	else if (w->interval)
		995	{
		996	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		997	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		998	downheap ((WT *)periodics, periodiccnt, 0);
		999	}
		1000	else
		1001	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1002
		1003	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1004	}
		1005	}
		1006
		1007	static void
		1008	periodics_reschedule (EV_P)
		1009	{
		1010	int i;
		1011
		1012	/* adjust periodics after time jump */
		1013	for (i = 0; i < periodiccnt; ++i)
		1014	{
		1015	struct ev_periodic *w = periodics [i];
		1016
		1017	if (w->reschedule_cb)
		1018	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1019	else if (w->interval)
		1020	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1021	}
		1022
		1023	/* now rebuild the heap */
		1024	for (i = periodiccnt >> 1; i--; )
		1025	downheap ((WT *)periodics, periodiccnt, i);
		1026	}
		1027
		1028	inline int
		1029	time_update_monotonic (EV_P)
		1030	{
		1031	mn_now = get_clock ();
		1032
		1033	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1034	{
		1035	rt_now = rtmn_diff + mn_now;
		1036	return 0;
		1037	}
		1038	else
		1039	{
		1040	now_floor = mn_now;
		1041	rt_now = ev_time ();
		1042	return 1;
		1043	}
		1044	}
		1045
		1046	static void
		1047	time_update (EV_P)
		1048	{
		1049	int i;
		1050
		1051	#if EV_USE_MONOTONIC
		1052	if (expect_true (have_monotonic))
		1053	{
		1054	if (time_update_monotonic (EV_A))
		1055	{
		1056	ev_tstamp odiff = rtmn_diff;
		1057
		1058	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1059	{
		1060	rtmn_diff = rt_now - mn_now;
		1061
		1062	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1063	return; /* all is well */
		1064
		1065	rt_now = ev_time ();
		1066	mn_now = get_clock ();
		1067	now_floor = mn_now;
		1068	}
		1069
		1070	periodics_reschedule (EV_A);
		1071	/* no timer adjustment, as the monotonic clock doesn't jump */
		1072	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1073	}
		1074	}
		1075	else
		1076	#endif
		1077	{
		1078	rt_now = ev_time ();
		1079
		1080	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1081	{
		1082	periodics_reschedule (EV_A);
		1083
		1084	/* adjust timers. this is easy, as the offset is the same for all */
		1085	for (i = 0; i < timercnt; ++i)
		1086	((WT)timers [i])->at += rt_now - mn_now;
		1087	}
		1088
		1089	mn_now = rt_now;
		1090	}
		1091	}
		1092
		1093	void
		1094	ev_ref (EV_P)
		1095	{
		1096	++activecnt;
		1097	}
		1098
		1099	void
		1100	ev_unref (EV_P)
		1101	{
		1102	--activecnt;
		1103	}
		1104
		1105	static int loop_done;
		1106
		1107	void
280	int ev_loop (int flags)	1108	ev_loop (EV_P_ int flags)
281	{	1109	{
282	double block;	1110	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	1111	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
284		1112
285	do	1113	do
286	{	1114	{
		1115	/* queue check watchers (and execute them) */
		1116	if (expect_false (preparecnt))
		1117	{
		1118	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1119	call_pending (EV_A);
		1120	}
		1121
		1122	/* we might have forked, so reify kernel state if necessary */
		1123	if (expect_false (postfork))
		1124	loop_fork (EV_A);
		1125
287	/* update fd-related kernel structures */	1126	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1127	fd_reify (EV_A);
289		1128
290	/* calculate blocking time */	1129	/* calculate blocking time */
		1130
		1131	/* we only need this for !monotonic clock or timers, but as we basically
		1132	always have timers, we just calculate it always */
		1133	#if EV_USE_MONOTONIC
		1134	if (expect_true (have_monotonic))
		1135	time_update_monotonic (EV_A);
		1136	else
		1137	#endif
		1138	{
291	ev_now = ev_time ();	1139	rt_now = ev_time ();
		1140	mn_now = rt_now;
		1141	}
292		1142
293	if (flags & EVLOOP_NONBLOCK)	1143	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	1144	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	1145	else
298	{	1146	{
		1147	block = MAX_BLOCKTIME;
		1148
		1149	if (timercnt)
		1150	{
299	block = timers [0]->at - ev_now + method_fudge;	1151	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
		1152	if (block > to) block = to;
		1153	}
		1154
		1155	if (periodiccnt)
		1156	{
		1157	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
		1158	if (block > to) block = to;
		1159	}
		1160
300	if (block < 0.) block = 0.;	1161	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1162	}
303		1163
304	method_poll (block);	1164	method_poll (EV_A_ block);
305		1165
		1166	/* update rt_now, do magic */
		1167	time_update (EV_A);
		1168
306	/* put pending timers into pendign queue and reschedule them */	1169	/* queue pending timers and reschedule them */
307	timer_reify ();	1170	timers_reify (EV_A); /* relative timers called last */
		1171	periodics_reify (EV_A); /* absolute timers called first */
308		1172
309	ev_now = ev_time ();	1173	/* queue idle watchers unless io or timers are pending */
		1174	if (idlecnt && !any_pending (EV_A))
		1175	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1176
		1177	/* queue check watchers, to be executed first */
		1178	if (checkcnt)
		1179	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1180
310	call_pending ();	1181	call_pending (EV_A);
311	}	1182	}
312	while (!ev_loop_done);	1183	while (activecnt && !loop_done);
313	}
314		1184
315	static void	1185	if (loop_done != 2)
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1186	loop_done = 0;
		1187	}
		1188
		1189	void
		1190	ev_unloop (EV_P_ int how)
		1191	{
		1192	loop_done = how;
		1193	}
		1194
		1195	/*****************************************************************************/
		1196
		1197	inline void
		1198	wlist_add (WL *head, WL elem)
317	{	1199	{
318	elem->next = *head;	1200	elem->next = *head;
319	*head = elem;	1201	*head = elem;
320	}	1202	}
321		1203
322	static void	1204	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1205	wlist_del (WL *head, WL elem)
324	{	1206	{
325	while (*head)	1207	while (*head)
326	{	1208	{
327	if (*head == elem)	1209	if (*head == elem)
328	{	1210	{
…		…
332		1214
333	head = &(*head)->next;	1215	head = &(*head)->next;
334	}	1216	}
335	}	1217	}
336		1218
337	static void	1219	inline void
338	ev_start (struct ev_watcher *w, int active)	1220	ev_clear_pending (EV_P_ W w)
339	{	1221	{
		1222	if (w->pending)
		1223	{
		1224	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	1225	w->pending = 0;
		1226	}
		1227	}
		1228
		1229	inline void
		1230	ev_start (EV_P_ W w, int active)
		1231	{
		1232	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1233	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1234
341	w->active = active;	1235	w->active = active;
		1236	ev_ref (EV_A);
342	}	1237	}
343		1238
344	static void	1239	inline void
345	ev_stop (struct ev_watcher *w)	1240	ev_stop (EV_P_ W w)
346	{	1241	{
347	if (w->pending)	1242	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	1243	w->active = 0;
351	/* nop */
352	}	1244	}
353		1245
		1246	/*****************************************************************************/
		1247
354	void	1248	void
355	evio_start (struct ev_io *w)	1249	ev_io_start (EV_P_ struct ev_io *w)
356	{	1250	{
		1251	int fd = w->fd;
		1252
357	if (ev_is_active (w))	1253	if (ev_is_active (w))
358	return;	1254	return;
359		1255
360	int fd = w->fd;	1256	assert (("ev_io_start called with negative fd", fd >= 0));
361		1257
362	ev_start ((struct ev_watcher *)w, 1);	1258	ev_start (EV_A_ (W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1259	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1260	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		1261
366	++fdchangecnt;	1262	fd_change (EV_A_ fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	1263	}
370		1264
371	void	1265	void
372	evio_stop (struct ev_io *w)	1266	ev_io_stop (EV_P_ struct ev_io *w)
373	{	1267	{
		1268	ev_clear_pending (EV_A_ (W)w);
374	if (!ev_is_active (w))	1269	if (!ev_is_active (w))
375	return;	1270	return;
376		1271
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1272	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	1273	ev_stop (EV_A_ (W)w);
379		1274
380	++fdchangecnt;	1275	fd_change (EV_A_ w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	1276	}
384		1277
385	void	1278	void
386	evtimer_start (struct ev_timer *w)	1279	ev_timer_start (EV_P_ struct ev_timer *w)
387	{	1280	{
388	if (ev_is_active (w))	1281	if (ev_is_active (w))
389	return;	1282	return;
390		1283
391	if (w->is_abs)	1284	((WT)w)->at += mn_now;
		1285
		1286	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1287
		1288	ev_start (EV_A_ (W)w, ++timercnt);
		1289	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1290	timers [timercnt - 1] = w;
		1291	upheap ((WT *)timers, timercnt - 1);
		1292
		1293	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1294	}
		1295
		1296	void
		1297	ev_timer_stop (EV_P_ struct ev_timer *w)
		1298	{
		1299	ev_clear_pending (EV_A_ (W)w);
		1300	if (!ev_is_active (w))
		1301	return;
		1302
		1303	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1304
		1305	if (((W)w)->active < timercnt--)
		1306	{
		1307	timers [((W)w)->active - 1] = timers [timercnt];
		1308	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
392	{	1309	}
393	/* this formula differs from the one in timer_reify becuse we do not round up */	1310
		1311	((WT)w)->at = w->repeat;
		1312
		1313	ev_stop (EV_A_ (W)w);
		1314	}
		1315
		1316	void
		1317	ev_timer_again (EV_P_ struct ev_timer *w)
		1318	{
		1319	if (ev_is_active (w))
		1320	{
394	if (w->repeat)	1321	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1322	{
		1323	((WT)w)->at = mn_now + w->repeat;
		1324	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1325	}
		1326	else
		1327	ev_timer_stop (EV_A_ w);
		1328	}
		1329	else if (w->repeat)
		1330	ev_timer_start (EV_A_ w);
		1331	}
		1332
		1333	void
		1334	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1335	{
		1336	if (ev_is_active (w))
		1337	return;
		1338
		1339	if (w->reschedule_cb)
		1340	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1341	else if (w->interval)
396	}	1342	{
		1343	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1344	/* this formula differs from the one in periodic_reify because we do not always round up */
		1345	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1346	}
		1347
		1348	ev_start (EV_A_ (W)w, ++periodiccnt);
		1349	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1350	periodics [periodiccnt - 1] = w;
		1351	upheap ((WT *)periodics, periodiccnt - 1);
		1352
		1353	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1354	}
		1355
		1356	void
		1357	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1358	{
		1359	ev_clear_pending (EV_A_ (W)w);
		1360	if (!ev_is_active (w))
		1361	return;
		1362
		1363	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1364
		1365	if (((W)w)->active < periodiccnt--)
		1366	{
		1367	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1368	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1369	}
		1370
		1371	ev_stop (EV_A_ (W)w);
		1372	}
		1373
		1374	void
		1375	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1376	{
		1377	ev_periodic_stop (EV_A_ w);
		1378	ev_periodic_start (EV_A_ w);
		1379	}
		1380
		1381	void
		1382	ev_idle_start (EV_P_ struct ev_idle *w)
		1383	{
		1384	if (ev_is_active (w))
		1385	return;
		1386
		1387	ev_start (EV_A_ (W)w, ++idlecnt);
		1388	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1389	idles [idlecnt - 1] = w;
		1390	}
		1391
		1392	void
		1393	ev_idle_stop (EV_P_ struct ev_idle *w)
		1394	{
		1395	ev_clear_pending (EV_A_ (W)w);
		1396	if (ev_is_active (w))
		1397	return;
		1398
		1399	idles [((W)w)->active - 1] = idles [--idlecnt];
		1400	ev_stop (EV_A_ (W)w);
		1401	}
		1402
		1403	void
		1404	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1405	{
		1406	if (ev_is_active (w))
		1407	return;
		1408
		1409	ev_start (EV_A_ (W)w, ++preparecnt);
		1410	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1411	prepares [preparecnt - 1] = w;
		1412	}
		1413
		1414	void
		1415	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1416	{
		1417	ev_clear_pending (EV_A_ (W)w);
		1418	if (ev_is_active (w))
		1419	return;
		1420
		1421	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1422	ev_stop (EV_A_ (W)w);
		1423	}
		1424
		1425	void
		1426	ev_check_start (EV_P_ struct ev_check *w)
		1427	{
		1428	if (ev_is_active (w))
		1429	return;
		1430
		1431	ev_start (EV_A_ (W)w, ++checkcnt);
		1432	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1433	checks [checkcnt - 1] = w;
		1434	}
		1435
		1436	void
		1437	ev_check_stop (EV_P_ struct ev_check *w)
		1438	{
		1439	ev_clear_pending (EV_A_ (W)w);
		1440	if (ev_is_active (w))
		1441	return;
		1442
		1443	checks [((W)w)->active - 1] = checks [--checkcnt];
		1444	ev_stop (EV_A_ (W)w);
		1445	}
		1446
		1447	#ifndef SA_RESTART
		1448	# define SA_RESTART 0
		1449	#endif
		1450
		1451	void
		1452	ev_signal_start (EV_P_ struct ev_signal *w)
		1453	{
		1454	#if EV_MULTIPLICITY
		1455	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1456	#endif
		1457	if (ev_is_active (w))
		1458	return;
		1459
		1460	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1461
		1462	ev_start (EV_A_ (W)w, 1);
		1463	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1464	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1465
		1466	if (!((WL)w)->next)
		1467	{
		1468	#if WIN32
		1469	signal (w->signum, sighandler);
		1470	#else
		1471	struct sigaction sa;
		1472	sa.sa_handler = sighandler;
		1473	sigfillset (&sa.sa_mask);
		1474	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1475	sigaction (w->signum, &sa, 0);
		1476	#endif
		1477	}
		1478	}
		1479
		1480	void
		1481	ev_signal_stop (EV_P_ struct ev_signal *w)
		1482	{
		1483	ev_clear_pending (EV_A_ (W)w);
		1484	if (!ev_is_active (w))
		1485	return;
		1486
		1487	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1488	ev_stop (EV_A_ (W)w);
		1489
		1490	if (!signals [w->signum - 1].head)
		1491	signal (w->signum, SIG_DFL);
		1492	}
		1493
		1494	void
		1495	ev_child_start (EV_P_ struct ev_child *w)
		1496	{
		1497	#if EV_MULTIPLICITY
		1498	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1499	#endif
		1500	if (ev_is_active (w))
		1501	return;
		1502
		1503	ev_start (EV_A_ (W)w, 1);
		1504	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1505	}
		1506
		1507	void
		1508	ev_child_stop (EV_P_ struct ev_child *w)
		1509	{
		1510	ev_clear_pending (EV_A_ (W)w);
		1511	if (ev_is_active (w))
		1512	return;
		1513
		1514	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1515	ev_stop (EV_A_ (W)w);
		1516	}
		1517
		1518	/*****************************************************************************/
		1519
		1520	struct ev_once
		1521	{
		1522	struct ev_io io;
		1523	struct ev_timer to;
		1524	void (*cb)(int revents, void *arg);
		1525	void *arg;
		1526	};
		1527
		1528	static void
		1529	once_cb (EV_P_ struct ev_once *once, int revents)
		1530	{
		1531	void (*cb)(int revents, void *arg) = once->cb;
		1532	void *arg = once->arg;
		1533
		1534	ev_io_stop (EV_A_ &once->io);
		1535	ev_timer_stop (EV_A_ &once->to);
		1536	ev_free (once);
		1537
		1538	cb (revents, arg);
		1539	}
		1540
		1541	static void
		1542	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1543	{
		1544	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1545	}
		1546
		1547	static void
		1548	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1549	{
		1550	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1551	}
		1552
		1553	void
		1554	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1555	{
		1556	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1557
		1558	if (!once)
		1559	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
397	else	1560	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	}	1561	{
		1562	once->cb = cb;
		1563	once->arg = arg;
417		1564
418	ev_stop ((struct ev_watcher *)w);	1565	ev_watcher_init (&once->io, once_cb_io);
419	}	1566	if (fd >= 0)
		1567	{
		1568	ev_io_set (&once->io, fd, events);
		1569	ev_io_start (EV_A_ &once->io);
		1570	}
420		1571
421	void	1572	ev_watcher_init (&once->to, once_cb_to);
422	evsignal_start (struct ev_signal *w)	1573	if (timeout >= 0.)
423	{	1574	{
424	if (ev_is_active (w))	1575	ev_timer_set (&once->to, timeout, 0.);
425	return;	1576	ev_timer_start (EV_A_ &once->to);
426		1577	}
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	{	1578	}
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	}	1579	}
484		1580
485	#endif
486
487
488
489

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